netconn.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3 Copyright (C) 2002 Mathieu Olivier
   4 Copyright (C) 2003 Forest Hale
   5
   6 This program is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public License
   8 as published by the Free Software Foundation; either version 2
   9 of the License, or (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14
  15 See the GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20
  21 */
  22
  23 #include "quakedef.h"
  24 #include "thread.h"
  25 #include "lhnet.h"
  26
  27 // for secure rcon authentication
  28 #include "hmac.h"
  29 #include "mdfour.h"
  30 #include <time.h>
  31
  32 #define QWMASTER_PORT 27000
  33 #define DPMASTER_PORT 27950
  34
  35 // note this defaults on for dedicated servers, off for listen servers
  36 cvar_t sv_public = {0, "sv_public", "0", "1: advertises this server on the master server (so that players can find it in the server browser); 0: allow direct queries only; -1: do not respond to direct queries; -2: do not allow anyone to connect; -3: already block at getchallenge level"};
  37 cvar_t sv_public_rejectreason = {0, "sv_public_rejectreason", "The server is closing.", "Rejection reason for connects when sv_public is -2"};
  38 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "120", "how often to send heartbeat in seconds (only used if sv_public is 1)"};
  39 extern cvar_t sv_status_privacy;
  40
  41 static cvar_t sv_masters [] =
  42 {
  43         {CVAR_SAVE, "sv_master1", "", "user-chosen master server 1"},
  44         {CVAR_SAVE, "sv_master2", "", "user-chosen master server 2"},
  45         {CVAR_SAVE, "sv_master3", "", "user-chosen master server 3"},
  46         {CVAR_SAVE, "sv_master4", "", "user-chosen master server 4"},
  47         {0, "sv_masterextra1", "69.59.212.88", "ghdigital.com - default master server 1 (admin: LordHavoc)"}, // admin: LordHavoc
  48         {0, "sv_masterextra2", "107.161.23.68", "dpmaster.deathmask.net - default master server 2 (admin: Willis)"}, // admin: Willis
  49         {0, "sv_masterextra3", "92.62.40.73", "dpmaster.tchr.no - default master server 3 (admin: tChr)"}, // admin: tChr
  50 #ifdef SUPPORTIPV6
  51         {0, "sv_masterextra4", "[2a03:4000:2:225::51:334d]:27950", "dpmaster.sudo.rm-f.org - default master server 4 (admin: divVerent)"}, // admin: divVerent
  52         {0, "sv_masterextra5", "[2604:180::4ac:98c1]:27950", "dpmaster.deathmask.net - default master server 5 ipv6 address of dpmaster.deathmask.net (admin: Willis)"}, // admin: Willis
  53 #endif
  54         {0, NULL, NULL, NULL}
  55 };
  56
  57 #ifdef CONFIG_MENU
  58 static cvar_t sv_qwmasters [] =
  59 {
  60         {CVAR_SAVE, "sv_qwmaster1", "", "user-chosen qwmaster server 1"},
  61         {CVAR_SAVE, "sv_qwmaster2", "", "user-chosen qwmaster server 2"},
  62         {CVAR_SAVE, "sv_qwmaster3", "", "user-chosen qwmaster server 3"},
  63         {CVAR_SAVE, "sv_qwmaster4", "", "user-chosen qwmaster server 4"},
  64         {0, "sv_qwmasterextra1", "master.quakeservers.net:27000", "Global master server. (admin: unknown)"},
  65         {0, "sv_qwmasterextra2", "asgaard.morphos-team.net:27000", "Global master server. (admin: unknown)"},
  66         {0, "sv_qwmasterextra3", "qwmaster.ocrana.de:27000", "German master server. (admin: unknown)"},
  67         {0, "sv_qwmasterextra4", "masterserver.exhale.de:27000", "German master server. (admin: unknown)"},
  68         {0, "sv_qwmasterextra5", "qwmaster.fodquake.net:27000", "Global master server. (admin: unknown)"},
  69         {0, NULL, NULL, NULL}
  70 };
  71 #endif
  72
  73 static double nextheartbeattime = 0;
  74
  75 sizebuf_t cl_message;
  76 sizebuf_t sv_message;
  77 static unsigned char cl_message_buf[NET_MAXMESSAGE];
  78 static unsigned char sv_message_buf[NET_MAXMESSAGE];
  79 char cl_readstring[MAX_INPUTLINE];
  80 char sv_readstring[MAX_INPUTLINE];
  81
  82 cvar_t net_test = {0, "net_test", "0", "internal development use only, leave it alone (usually does nothing anyway)"};
  83 cvar_t net_usesizelimit = {0, "net_usesizelimit", "2", "use packet size limiting (0: never, 1: in non-CSQC mode, 2: always)"};
  84 cvar_t net_burstreserve = {0, "net_burstreserve", "0.3", "how much of the burst time to reserve for packet size spikes"};
  85 cvar_t net_messagetimeout = {0, "net_messagetimeout","300", "drops players who have not sent any packets for this many seconds"};
  86 cvar_t net_connecttimeout = {0, "net_connecttimeout","15", "after requesting a connection, the client must reply within this many seconds or be dropped (cuts down on connect floods). Must be above 10 seconds."};
  87 cvar_t net_connectfloodblockingtimeout = {0, "net_connectfloodblockingtimeout", "5", "when a connection packet is received, it will block all future connect packets from that IP address for this many seconds (cuts down on connect floods). Note that this does not include retries from the same IP; these are handled earlier and let in."};
  88 cvar_t net_challengefloodblockingtimeout = {0, "net_challengefloodblockingtimeout", "0.5", "when a challenge packet is received, it will block all future challenge packets from that IP address for this many seconds (cuts down on challenge floods). DarkPlaces clients retry once per second, so this should be <= 1. Failure here may lead to connect attempts failing."};
  89 cvar_t net_getstatusfloodblockingtimeout = {0, "net_getstatusfloodblockingtimeout", "1", "when a getstatus packet is received, it will block all future getstatus packets from that IP address for this many seconds (cuts down on getstatus floods). DarkPlaces retries every 4 seconds, and qstat retries once per second, so this should be <= 1. Failure here may lead to server not showing up in the server list."};
  90 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED", "server message to show in server browser"};
  91 cvar_t developer_networking = {0, "developer_networking", "0", "prints all received and sent packets (recommended only for debugging)"};
  92
  93 cvar_t cl_netlocalping = {0, "cl_netlocalping","0", "lags local loopback connection by this much ping time (useful to play more fairly on your own server with people with higher pings)"};
  94 static cvar_t cl_netpacketloss_send = {0, "cl_netpacketloss_send","0", "drops this percentage of outgoing packets, useful for testing network protocol robustness (jerky movement, prediction errors, etc)"};
  95 static cvar_t cl_netpacketloss_receive = {0, "cl_netpacketloss_receive","0", "drops this percentage of incoming packets, useful for testing network protocol robustness (jerky movement, effects failing to start, sounds failing to play, etc)"};
  96 static cvar_t net_slist_queriespersecond = {0, "net_slist_queriespersecond", "20", "how many server information requests to send per second"};
  97 static cvar_t net_slist_queriesperframe = {0, "net_slist_queriesperframe", "4", "maximum number of server information requests to send each rendered frame (guards against low framerates causing problems)"};
  98 static cvar_t net_slist_timeout = {0, "net_slist_timeout", "4", "how long to listen for a server information response before giving up"};
  99 static cvar_t net_slist_pause = {0, "net_slist_pause", "0", "when set to 1, the server list won't update until it is set back to 0"};
 100 static cvar_t net_slist_maxtries = {0, "net_slist_maxtries", "3", "how many times to ask the same server for information (more times gives better ping reports but takes longer)"};
 101 static cvar_t net_slist_favorites = {CVAR_SAVE | CVAR_NQUSERINFOHACK, "net_slist_favorites", "", "contains a list of IP addresses and ports to always query explicitly"};
 102 static cvar_t net_tos_dscp = {CVAR_SAVE, "net_tos_dscp", "32", "DiffServ Codepoint for network sockets (may need game restart to apply)"};
 103 static cvar_t gameversion = {0, "gameversion", "0", "version of game data (mod-specific) to be sent to querying clients"};
 104 static cvar_t gameversion_min = {0, "gameversion_min", "-1", "minimum version of game data (mod-specific), when client and server gameversion mismatch in the server browser the server is shown as incompatible; if -1, gameversion is used alone"};
 105 static cvar_t gameversion_max = {0, "gameversion_max", "-1", "maximum version of game data (mod-specific), when client and server gameversion mismatch in the server browser the server is shown as incompatible; if -1, gameversion is used alone"};
 106 static cvar_t rcon_restricted_password = {CVAR_PRIVATE, "rcon_restricted_password", "", "password to authenticate rcon commands in restricted mode; may be set to a string of the form user1:pass1 user2:pass2 user3:pass3 to allow multiple user accounts - the client then has to specify ONE of these combinations"};
 107 static cvar_t rcon_restricted_commands = {0, "rcon_restricted_commands", "", "allowed commands for rcon when the restricted mode password was used"};
 108 static cvar_t rcon_secure_maxdiff = {0, "rcon_secure_maxdiff", "5", "maximum time difference between rcon request and server system clock (to protect against replay attack)"};
 109 extern cvar_t rcon_secure;
 110 extern cvar_t rcon_secure_challengetimeout;
 111
 112 double masterquerytime = -1000;
 113 int masterquerycount = 0;
 114 int masterreplycount = 0;
 115 int serverquerycount = 0;
 116 int serverreplycount = 0;
 117
 118 challenge_t challenge[MAX_CHALLENGES];
 119
 120 #ifdef CONFIG_MENU
 121 /// this is only false if there are still servers left to query
 122 static qboolean serverlist_querysleep = true;
 123 static qboolean serverlist_paused = false;
 124 /// this is pushed a second or two ahead of realtime whenever a master server
 125 /// reply is received, to avoid issuing queries while master replies are still
 126 /// flooding in (which would make a mess of the ping times)
 127 static double serverlist_querywaittime = 0;
 128 #endif
 129
 130 static int cl_numsockets;
 131 static lhnetsocket_t *cl_sockets[16];
 132 static int sv_numsockets;
 133 static lhnetsocket_t *sv_sockets[16];
 134
 135 netconn_t *netconn_list = NULL;
 136 mempool_t *netconn_mempool = NULL;
 137 void *netconn_mutex = NULL;
 138
 139 cvar_t cl_netport = {0, "cl_port", "0", "forces client to use chosen port number if not 0"};
 140 cvar_t sv_netport = {0, "port", "26000", "server port for players to connect to"};
 141 cvar_t net_address = {0, "net_address", "", "network address to open ipv4 ports on (if empty, use default interfaces)"};
 142 cvar_t net_address_ipv6 = {0, "net_address_ipv6", "", "network address to open ipv6 ports on (if empty, use default interfaces)"};
 143
 144 char cl_net_extresponse[NET_EXTRESPONSE_MAX][1400];
 145 int cl_net_extresponse_count = 0;
 146 int cl_net_extresponse_last = 0;
 147
 148 char sv_net_extresponse[NET_EXTRESPONSE_MAX][1400];
 149 int sv_net_extresponse_count = 0;
 150 int sv_net_extresponse_last = 0;
 151
 152 #ifdef CONFIG_MENU
 153 // ServerList interface
 154 serverlist_mask_t serverlist_andmasks[SERVERLIST_ANDMASKCOUNT];
 155 serverlist_mask_t serverlist_ormasks[SERVERLIST_ORMASKCOUNT];
 156
 157 serverlist_infofield_t serverlist_sortbyfield;
 158 int serverlist_sortflags;
 159
 160 int serverlist_viewcount = 0;
 161 unsigned short serverlist_viewlist[SERVERLIST_VIEWLISTSIZE];
 162
 163 int serverlist_maxcachecount = 0;
 164 int serverlist_cachecount = 0;
 165 serverlist_entry_t *serverlist_cache = NULL;
 166
 167 qboolean serverlist_consoleoutput;
 168
 169 static int nFavorites = 0;
 170 static lhnetaddress_t favorites[MAX_FAVORITESERVERS];
 171 static int nFavorites_idfp = 0;
 172 static char favorites_idfp[MAX_FAVORITESERVERS][FP64_SIZE+1];
 173
 174 void NetConn_UpdateFavorites(void)
 175 {
 176         const char *p;
 177         nFavorites = 0;
 178         nFavorites_idfp = 0;
 179         p = net_slist_favorites.string;
 180         while((size_t) nFavorites < sizeof(favorites) / sizeof(*favorites) && COM_ParseToken_Console(&p))
 181         {
 182                 if(com_token[0] != '[' && strlen(com_token) == FP64_SIZE && !strchr(com_token, '.'))
 183                 // currently 44 bytes, longest possible IPv6 address: 39 bytes, so this works
 184                 // (if v6 address contains port, it must start with '[')
 185                 {
 186                         strlcpy(favorites_idfp[nFavorites_idfp], com_token, sizeof(favorites_idfp[nFavorites_idfp]));
 187                         ++nFavorites_idfp;
 188                 }
 189                 else
 190                 {
 191                         if(LHNETADDRESS_FromString(&favorites[nFavorites], com_token, 26000))
 192                                 ++nFavorites;
 193                 }
 194         }
 195 }
 196
 197 /// helper function to insert a value into the viewset
 198 /// spare entries will be removed
 199 static void _ServerList_ViewList_Helper_InsertBefore( int index, serverlist_entry_t *entry )
 200 {
 201     int i;
 202         if( serverlist_viewcount < SERVERLIST_VIEWLISTSIZE ) {
 203                 i = serverlist_viewcount++;
 204         } else {
 205                 i = SERVERLIST_VIEWLISTSIZE - 1;
 206         }
 207
 208         for( ; i > index ; i-- )
 209                 serverlist_viewlist[ i ] = serverlist_viewlist[ i - 1 ];
 210
 211         serverlist_viewlist[index] = (int)(entry - serverlist_cache);
 212 }
 213
 214 /// we suppose serverlist_viewcount to be valid, ie > 0
 215 static void _ServerList_ViewList_Helper_Remove( int index )
 216 {
 217         serverlist_viewcount--;
 218         for( ; index < serverlist_viewcount ; index++ )
 219                 serverlist_viewlist[index] = serverlist_viewlist[index + 1];
 220 }
 221
 222 /// \returns true if A should be inserted before B
 223 static qboolean _ServerList_Entry_Compare( serverlist_entry_t *A, serverlist_entry_t *B )
 224 {
 225         int result = 0; // > 0 if for numbers A > B and for text if A < B
 226
 227         if( serverlist_sortflags & SLSF_CATEGORIES )
 228         {
 229                 result = A->info.category - B->info.category;
 230                 if (result != 0)
 231                         return result < 0;
 232         }
 233
 234         if( serverlist_sortflags & SLSF_FAVORITES )
 235         {
 236                 if(A->info.isfavorite != B->info.isfavorite)
 237                         return A->info.isfavorite;
 238         }
 239
 240         switch( serverlist_sortbyfield ) {
 241                 case SLIF_PING:
 242                         result = A->info.ping - B->info.ping;
 243                         break;
 244                 case SLIF_MAXPLAYERS:
 245                         result = A->info.maxplayers - B->info.maxplayers;
 246                         break;
 247                 case SLIF_NUMPLAYERS:
 248                         result = A->info.numplayers - B->info.numplayers;
 249                         break;
 250                 case SLIF_NUMBOTS:
 251                         result = A->info.numbots - B->info.numbots;
 252                         break;
 253                 case SLIF_NUMHUMANS:
 254                         result = A->info.numhumans - B->info.numhumans;
 255                         break;
 256                 case SLIF_FREESLOTS:
 257                         result = A->info.freeslots - B->info.freeslots;
 258                         break;
 259                 case SLIF_PROTOCOL:
 260                         result = A->info.protocol - B->info.protocol;
 261                         break;
 262                 case SLIF_CNAME:
 263                         result = strcmp( B->info.cname, A->info.cname );
 264                         break;
 265                 case SLIF_GAME:
 266                         result = strcasecmp( B->info.game, A->info.game );
 267                         break;
 268                 case SLIF_MAP:
 269                         result = strcasecmp( B->info.map, A->info.map );
 270                         break;
 271                 case SLIF_MOD:
 272                         result = strcasecmp( B->info.mod, A->info.mod );
 273                         break;
 274                 case SLIF_NAME:
 275                         result = strcasecmp( B->info.name, A->info.name );
 276                         break;
 277                 case SLIF_QCSTATUS:
 278                         result = strcasecmp( B->info.qcstatus, A->info.qcstatus ); // not really THAT useful, though
 279                         break;
 280                 case SLIF_CATEGORY:
 281                         result = A->info.category - B->info.category;
 282                         break;
 283                 case SLIF_ISFAVORITE:
 284                         result = !!B->info.isfavorite - !!A->info.isfavorite;
 285                         break;
 286                 default:
 287                         Con_DPrint( "_ServerList_Entry_Compare: Bad serverlist_sortbyfield!\n" );
 288                         break;
 289         }
 290
 291         if (result != 0)
 292         {
 293                 if( serverlist_sortflags & SLSF_DESCENDING )
 294                         return result > 0;
 295                 else
 296                         return result < 0;
 297         }
 298
 299         // if the chosen sort key is identical, sort by index
 300         // (makes this a stable sort, so that later replies from servers won't
 301         //  shuffle the servers around when they have the same ping)
 302         return A < B;
 303 }
 304
 305 static qboolean _ServerList_CompareInt( int A, serverlist_maskop_t op, int B )
 306 {
 307         // This should actually be done with some intermediate and end-of-function return
 308         switch( op ) {
 309                 case SLMO_LESS:
 310                         return A < B;
 311                 case SLMO_LESSEQUAL:
 312                         return A <= B;
 313                 case SLMO_EQUAL:
 314                         return A == B;
 315                 case SLMO_GREATER:
 316                         return A > B;
 317                 case SLMO_NOTEQUAL:
 318                         return A != B;
 319                 case SLMO_GREATEREQUAL:
 320                 case SLMO_CONTAINS:
 321                 case SLMO_NOTCONTAIN:
 322                 case SLMO_STARTSWITH:
 323                 case SLMO_NOTSTARTSWITH:
 324                         return A >= B;
 325                 default:
 326                         Con_DPrint( "_ServerList_CompareInt: Bad op!\n" );
 327                         return false;
 328         }
 329 }
 330
 331 static qboolean _ServerList_CompareStr( const char *A, serverlist_maskop_t op, const char *B )
 332 {
 333         int i;
 334         char bufferA[ 1400 ], bufferB[ 1400 ]; // should be more than enough
 335         COM_StringDecolorize(A, 0, bufferA, sizeof(bufferA), false);
 336         for (i = 0;i < (int)sizeof(bufferA)-1 && bufferA[i];i++)
 337                 bufferA[i] = (bufferA[i] >= 'A' && bufferA[i] <= 'Z') ? (bufferA[i] + 'a' - 'A') : bufferA[i];
 338         bufferA[i] = 0;
 339         for (i = 0;i < (int)sizeof(bufferB)-1 && B[i];i++)
 340                 bufferB[i] = (B[i] >= 'A' && B[i] <= 'Z') ? (B[i] + 'a' - 'A') : B[i];
 341         bufferB[i] = 0;
 342
 343         // Same here, also using an intermediate & final return would be more appropriate
 344         // A info B mask
 345         switch( op ) {
 346                 case SLMO_CONTAINS:
 347                         return *bufferB && !!strstr( bufferA, bufferB ); // we want a real bool
 348                 case SLMO_NOTCONTAIN:
 349                         return !*bufferB || !strstr( bufferA, bufferB );
 350                 case SLMO_STARTSWITH:
 351                         //Con_Printf("startsWith: %s %s\n", bufferA, bufferB);
 352                         return *bufferB && !memcmp(bufferA, bufferB, strlen(bufferB));
 353                 case SLMO_NOTSTARTSWITH:
 354                         return !*bufferB || memcmp(bufferA, bufferB, strlen(bufferB));
 355                 case SLMO_LESS:
 356                         return strcmp( bufferA, bufferB ) < 0;
 357                 case SLMO_LESSEQUAL:
 358                         return strcmp( bufferA, bufferB ) <= 0;
 359                 case SLMO_EQUAL:
 360                         return strcmp( bufferA, bufferB ) == 0;
 361                 case SLMO_GREATER:
 362                         return strcmp( bufferA, bufferB ) > 0;
 363                 case SLMO_NOTEQUAL:
 364                         return strcmp( bufferA, bufferB ) != 0;
 365                 case SLMO_GREATEREQUAL:
 366                         return strcmp( bufferA, bufferB ) >= 0;
 367                 default:
 368                         Con_DPrint( "_ServerList_CompareStr: Bad op!\n" );
 369                         return false;
 370         }
 371 }
 372
 373 static qboolean _ServerList_Entry_Mask( serverlist_mask_t *mask, serverlist_info_t *info )
 374 {
 375         if( !_ServerList_CompareInt( info->ping, mask->tests[SLIF_PING], mask->info.ping ) )
 376                 return false;
 377         if( !_ServerList_CompareInt( info->maxplayers, mask->tests[SLIF_MAXPLAYERS], mask->info.maxplayers ) )
 378                 return false;
 379         if( !_ServerList_CompareInt( info->numplayers, mask->tests[SLIF_NUMPLAYERS], mask->info.numplayers ) )
 380                 return false;
 381         if( !_ServerList_CompareInt( info->numbots, mask->tests[SLIF_NUMBOTS], mask->info.numbots ) )
 382                 return false;
 383         if( !_ServerList_CompareInt( info->numhumans, mask->tests[SLIF_NUMHUMANS], mask->info.numhumans ) )
 384                 return false;
 385         if( !_ServerList_CompareInt( info->freeslots, mask->tests[SLIF_FREESLOTS], mask->info.freeslots ) )
 386                 return false;
 387         if( !_ServerList_CompareInt( info->protocol, mask->tests[SLIF_PROTOCOL], mask->info.protocol ))
 388                 return false;
 389         if( *mask->info.cname
 390                 && !_ServerList_CompareStr( info->cname, mask->tests[SLIF_CNAME], mask->info.cname ) )
 391                 return false;
 392         if( *mask->info.game
 393                 && !_ServerList_CompareStr( info->game, mask->tests[SLIF_GAME], mask->info.game ) )
 394                 return false;
 395         if( *mask->info.mod
 396                 && !_ServerList_CompareStr( info->mod, mask->tests[SLIF_MOD], mask->info.mod ) )
 397                 return false;
 398         if( *mask->info.map
 399                 && !_ServerList_CompareStr( info->map, mask->tests[SLIF_MAP], mask->info.map ) )
 400                 return false;
 401         if( *mask->info.name
 402                 && !_ServerList_CompareStr( info->name, mask->tests[SLIF_NAME], mask->info.name ) )
 403                 return false;
 404         if( *mask->info.qcstatus
 405                 && !_ServerList_CompareStr( info->qcstatus, mask->tests[SLIF_QCSTATUS], mask->info.qcstatus ) )
 406                 return false;
 407         if( *mask->info.players
 408                 && !_ServerList_CompareStr( info->players, mask->tests[SLIF_PLAYERS], mask->info.players ) )
 409                 return false;
 410         if( !_ServerList_CompareInt( info->category, mask->tests[SLIF_CATEGORY], mask->info.category ) )
 411                 return false;
 412         if( !_ServerList_CompareInt( info->isfavorite, mask->tests[SLIF_ISFAVORITE], mask->info.isfavorite ))
 413                 return false;
 414         return true;
 415 }
 416
 417 static void ServerList_ViewList_Insert( serverlist_entry_t *entry )
 418 {
 419         int start, end, mid, i;
 420         lhnetaddress_t addr;
 421
 422         // reject incompatible servers
 423         if(
 424                 entry->info.gameversion != gameversion.integer
 425                 &&
 426                 !(
 427                            gameversion_min.integer >= 0 // min/max range set by user/mod?
 428                         && gameversion_max.integer >= 0
 429                         && gameversion_min.integer <= entry->info.gameversion // version of server in min/max range?
 430                         && gameversion_max.integer >= entry->info.gameversion
 431                  )
 432         )
 433                 return;
 434
 435         // refresh the "favorite" status
 436         entry->info.isfavorite = false;
 437         if(LHNETADDRESS_FromString(&addr, entry->info.cname, 26000))
 438         {
 439                 char idfp[FP64_SIZE+1];
 440                 for(i = 0; i < nFavorites; ++i)
 441                 {
 442                         if(LHNETADDRESS_Compare(&addr, &favorites[i]) == 0)
 443                         {
 444                                 entry->info.isfavorite = true;
 445                                 break;
 446                         }
 447                 }
 448                 if(Crypto_RetrieveHostKey(&addr, 0, NULL, 0, idfp, sizeof(idfp), NULL))
 449                 {
 450                         for(i = 0; i < nFavorites_idfp; ++i)
 451                         {
 452                                 if(!strcmp(idfp, favorites_idfp[i]))
 453                                 {
 454                                         entry->info.isfavorite = true;
 455                                         break;
 456                                 }
 457                         }
 458                 }
 459         }
 460
 461         // refresh the "category"
 462         entry->info.category = MR_GetServerListEntryCategory(entry);
 463
 464         // FIXME: change this to be more readable (...)
 465         // now check whether it passes through the masks
 466         for( start = 0 ; start < SERVERLIST_ANDMASKCOUNT && serverlist_andmasks[start].active; start++ )
 467                 if( !_ServerList_Entry_Mask( &serverlist_andmasks[start], &entry->info ) )
 468                         return;
 469
 470         for( start = 0 ; start < SERVERLIST_ORMASKCOUNT && serverlist_ormasks[start].active ; start++ )
 471                 if( _ServerList_Entry_Mask( &serverlist_ormasks[start], &entry->info ) )
 472                         break;
 473         if( start == SERVERLIST_ORMASKCOUNT || (start > 0 && !serverlist_ormasks[start].active) )
 474                 return;
 475
 476         if( !serverlist_viewcount ) {
 477                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 478                 return;
 479         }
 480         // ok, insert it, we just need to find out where exactly:
 481
 482         // two special cases
 483         // check whether to insert it as new first item
 484         if( _ServerList_Entry_Compare( entry, ServerList_GetViewEntry(0) ) ) {
 485                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 486                 return;
 487         } // check whether to insert it as new last item
 488         else if( !_ServerList_Entry_Compare( entry, ServerList_GetViewEntry(serverlist_viewcount - 1) ) ) {
 489                 _ServerList_ViewList_Helper_InsertBefore( serverlist_viewcount, entry );
 490                 return;
 491         }
 492         start = 0;
 493         end = serverlist_viewcount - 1;
 494         while( end > start + 1 )
 495         {
 496                 mid = (start + end) / 2;
 497                 // test the item that lies in the middle between start and end
 498                 if( _ServerList_Entry_Compare( entry, ServerList_GetViewEntry(mid) ) )
 499                         // the item has to be in the upper half
 500                         end = mid;
 501                 else
 502                         // the item has to be in the lower half
 503                         start = mid;
 504         }
 505         _ServerList_ViewList_Helper_InsertBefore( start + 1, entry );
 506 }
 507
 508 static void ServerList_ViewList_Remove( serverlist_entry_t *entry )
 509 {
 510         int i;
 511         for( i = 0; i < serverlist_viewcount; i++ )
 512         {
 513                 if (ServerList_GetViewEntry(i) == entry)
 514                 {
 515                         _ServerList_ViewList_Helper_Remove(i);
 516                         break;
 517                 }
 518         }
 519 }
 520
 521 void ServerList_RebuildViewList(void)
 522 {
 523         int i;
 524
 525         serverlist_viewcount = 0;
 526         for( i = 0 ; i < serverlist_cachecount ; i++ ) {
 527                 serverlist_entry_t *entry = &serverlist_cache[i];
 528                 // also display entries that are currently being refreshed [11/8/2007 Black]
 529                 if( entry->query == SQS_QUERIED || entry->query == SQS_REFRESHING )
 530                         ServerList_ViewList_Insert( entry );
 531         }
 532 }
 533
 534 void ServerList_ResetMasks(void)
 535 {
 536         int i;
 537
 538         memset( &serverlist_andmasks, 0, sizeof( serverlist_andmasks ) );
 539         memset( &serverlist_ormasks, 0, sizeof( serverlist_ormasks ) );
 540         // numbots needs to be compared to -1 to always succeed
 541         for(i = 0; i < SERVERLIST_ANDMASKCOUNT; ++i)
 542                 serverlist_andmasks[i].info.numbots = -1;
 543         for(i = 0; i < SERVERLIST_ORMASKCOUNT; ++i)
 544                 serverlist_ormasks[i].info.numbots = -1;
 545 }
 546
 547 void ServerList_GetPlayerStatistics(int *numplayerspointer, int *maxplayerspointer)
 548 {
 549         int i;
 550         int numplayers = 0, maxplayers = 0;
 551         for (i = 0;i < serverlist_cachecount;i++)
 552         {
 553                 if (serverlist_cache[i].query == SQS_QUERIED)
 554                 {
 555                         numplayers += serverlist_cache[i].info.numhumans;
 556                         maxplayers += serverlist_cache[i].info.maxplayers;
 557                 }
 558         }
 559         *numplayerspointer = numplayers;
 560         *maxplayerspointer = maxplayers;
 561 }
 562
 563 #if 0
 564 static void _ServerList_Test(void)
 565 {
 566         int i;
 567         if (serverlist_maxcachecount <= 1024)
 568         {
 569                 serverlist_maxcachecount = 1024;
 570                 serverlist_cache = (serverlist_entry_t *)Mem_Realloc(netconn_mempool, (void *)serverlist_cache, sizeof(serverlist_entry_t) * serverlist_maxcachecount);
 571         }
 572         for( i = 0 ; i < 1024 ; i++ ) {
 573                 memset( &serverlist_cache[serverlist_cachecount], 0, sizeof( serverlist_entry_t ) );
 574                 serverlist_cache[serverlist_cachecount].info.ping = 1000 + 1024 - i;
 575                 dpsnprintf( serverlist_cache[serverlist_cachecount].info.name, sizeof(serverlist_cache[serverlist_cachecount].info.name), "Black's ServerList Test %i", i );
 576                 serverlist_cache[serverlist_cachecount].finished = true;
 577                 dpsnprintf( serverlist_cache[serverlist_cachecount].line1, sizeof(serverlist_cache[serverlist_cachecount].info.line1), "%i %s", serverlist_cache[serverlist_cachecount].info.ping, serverlist_cache[serverlist_cachecount].info.name );
 578                 ServerList_ViewList_Insert( &serverlist_cache[serverlist_cachecount] );
 579                 serverlist_cachecount++;
 580         }
 581 }
 582 #endif
 583
 584 void ServerList_QueryList(qboolean resetcache, qboolean querydp, qboolean queryqw, qboolean consoleoutput)
 585 {
 586         masterquerytime = realtime;
 587         masterquerycount = 0;
 588         masterreplycount = 0;
 589         if( resetcache ) {
 590                 serverquerycount = 0;
 591                 serverreplycount = 0;
 592                 serverlist_cachecount = 0;
 593                 serverlist_viewcount = 0;
 594                 serverlist_maxcachecount = 0;
 595                 serverlist_cache = (serverlist_entry_t *)Mem_Realloc(netconn_mempool, (void *)serverlist_cache, sizeof(serverlist_entry_t) * serverlist_maxcachecount);
 596         } else {
 597                 // refresh all entries
 598                 int n;
 599                 for( n = 0 ; n < serverlist_cachecount ; n++ ) {
 600                         serverlist_entry_t *entry = &serverlist_cache[ n ];
 601                         entry->query = SQS_REFRESHING;
 602                         entry->querycounter = 0;
 603                 }
 604         }
 605         serverlist_consoleoutput = consoleoutput;
 606
 607         //_ServerList_Test();
 608
 609         NetConn_QueryMasters(querydp, queryqw);
 610 }
 611 #endif
 612
 613 // rest
 614
 615 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
 616 {
 617         int length;
 618         int i;
 619         if (mysocket->address.addresstype == LHNETADDRESSTYPE_LOOP && netconn_mutex)
 620                 Thread_LockMutex(netconn_mutex);
 621         length = LHNET_Read(mysocket, data, maxlength, peeraddress);
 622         if (mysocket->address.addresstype == LHNETADDRESSTYPE_LOOP && netconn_mutex)
 623                 Thread_UnlockMutex(netconn_mutex);
 624         if (length == 0)
 625                 return 0;
 626         if (cl_netpacketloss_receive.integer)
 627                 for (i = 0;i < cl_numsockets;i++)
 628                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss_receive.integer)
 629                                 return 0;
 630         if (developer_networking.integer)
 631         {
 632                 char addressstring[128], addressstring2[128];
 633                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 634                 if (length > 0)
 635                 {
 636                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 637                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", (void *)mysocket, addressstring, (void *)data, maxlength, (void *)peeraddress, length, addressstring2);
 638                         Com_HexDumpToConsole((unsigned char *)data, length);
 639                 }
 640                 else
 641                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", (void *)mysocket, addressstring, (void *)data, maxlength, (void *)peeraddress, length);
 642         }
 643         return length;
 644 }
 645
 646 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 647 {
 648         int ret;
 649         int i;
 650         if (cl_netpacketloss_send.integer)
 651                 for (i = 0;i < cl_numsockets;i++)
 652                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss_send.integer)
 653                                 return length;
 654         if (mysocket->address.addresstype == LHNETADDRESSTYPE_LOOP && netconn_mutex)
 655                 Thread_LockMutex(netconn_mutex);
 656         ret = LHNET_Write(mysocket, data, length, peeraddress);
 657         if (mysocket->address.addresstype == LHNETADDRESSTYPE_LOOP && netconn_mutex)
 658                 Thread_UnlockMutex(netconn_mutex);
 659         if (developer_networking.integer)
 660         {
 661                 char addressstring[128], addressstring2[128];
 662                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 663                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 664                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", (void *)mysocket, addressstring, (void *)data, length, (void *)peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 665                 Com_HexDumpToConsole((unsigned char *)data, length);
 666         }
 667         return ret;
 668 }
 669
 670 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 671 {
 672         // note this does not include the trailing NULL because we add that in the parser
 673         return NetConn_Write(mysocket, string, (int)strlen(string), peeraddress);
 674 }
 675
 676 qboolean NetConn_CanSend(netconn_t *conn)
 677 {
 678         conn->outgoing_packetcounter = (conn->outgoing_packetcounter + 1) % NETGRAPH_PACKETS;
 679         conn->outgoing_netgraph[conn->outgoing_packetcounter].time            = realtime;
 680         conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes = NETGRAPH_NOPACKET;
 681         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
 682         conn->outgoing_netgraph[conn->outgoing_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
 683         conn->outgoing_netgraph[conn->outgoing_packetcounter].cleartime       = conn->cleartime;
 684         if (realtime > conn->cleartime)
 685                 return true;
 686         else
 687         {
 688                 conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes = NETGRAPH_CHOKEDPACKET;
 689                 return false;
 690         }
 691 }
 692
 693 void NetConn_UpdateCleartime(double *cleartime, int rate, int burstsize, int len)
 694 {
 695         double bursttime = burstsize / (double)rate;
 696
 697         // delay later packets to obey rate limit
 698         if (*cleartime < realtime - bursttime)
 699                 *cleartime = realtime - bursttime;
 700         *cleartime = *cleartime + len / (double)rate;
 701
 702         // limit bursts to one packet in size ("dialup mode" emulating old behaviour)
 703         if (net_test.integer)
 704         {
 705                 if (*cleartime < realtime)
 706                         *cleartime = realtime;
 707         }
 708 }
 709
 710 static int NetConn_AddCryptoFlag(crypto_t *crypto)
 711 {
 712         // HACK: if an encrypted connection is used, randomly set some unused
 713         // flags. When AES encryption is enabled, that will make resends differ
 714         // from the original, so that e.g. substring filters in a router/IPS
 715         // are unlikely to match a second time. See also "startkeylogger".
 716         int flag = 0;
 717         if (crypto->authenticated)
 718         {
 719                 // Let's always set at least one of the bits.
 720                 int r = rand() % 7 + 1;
 721                 if (r & 1)
 722                         flag |= NETFLAG_CRYPTO0;
 723                 if (r & 2)
 724                         flag |= NETFLAG_CRYPTO1;
 725                 if (r & 4)
 726                         flag |= NETFLAG_CRYPTO2;
 727         }
 728         return flag;
 729 }
 730
 731 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data, protocolversion_t protocol, int rate, int burstsize, qboolean quakesignon_suppressreliables)
 732 {
 733         int totallen = 0;
 734         unsigned char sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
 735         unsigned char cryptosendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE+CRYPTO_HEADERSIZE];
 736
 737         // if this packet was supposedly choked, but we find ourselves sending one
 738         // anyway, make sure the size counting starts at zero
 739         // (this mostly happens on level changes and disconnects and such)
 740         if (conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes == NETGRAPH_CHOKEDPACKET)
 741                 conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes = NETGRAPH_NOPACKET;
 742
 743         conn->outgoing_netgraph[conn->outgoing_packetcounter].cleartime = conn->cleartime;
 744
 745         if (protocol == PROTOCOL_QUAKEWORLD)
 746         {
 747                 int packetLen;
 748                 qboolean sendreliable;
 749
 750                 // note that it is ok to send empty messages to the qw server,
 751                 // otherwise it won't respond to us at all
 752
 753                 sendreliable = false;
 754                 // if the remote side dropped the last reliable message, resend it
 755                 if (conn->qw.incoming_acknowledged > conn->qw.last_reliable_sequence && conn->qw.incoming_reliable_acknowledged != conn->qw.reliable_sequence)
 756                         sendreliable = true;
 757                 // if the reliable transmit buffer is empty, copy the current message out
 758                 if (!conn->sendMessageLength && conn->message.cursize)
 759                 {
 760                         memcpy (conn->sendMessage, conn->message.data, conn->message.cursize);
 761                         conn->sendMessageLength = conn->message.cursize;
 762                         SZ_Clear(&conn->message); // clear the message buffer
 763                         conn->qw.reliable_sequence ^= 1;
 764                         sendreliable = true;
 765                 }
 766                 // outgoing unreliable packet number, and outgoing reliable packet number (0 or 1)
 767                 StoreLittleLong(sendbuffer, (unsigned int)conn->outgoing_unreliable_sequence | ((unsigned int)sendreliable<<31));
 768                 // last received unreliable packet number, and last received reliable packet number (0 or 1)
 769                 StoreLittleLong(sendbuffer + 4, (unsigned int)conn->qw.incoming_sequence | ((unsigned int)conn->qw.incoming_reliable_sequence<<31));
 770                 packetLen = 8;
 771                 conn->outgoing_unreliable_sequence++;
 772                 // client sends qport in every packet
 773                 if (conn == cls.netcon)
 774                 {
 775                         *((short *)(sendbuffer + 8)) = LittleShort(cls.qw_qport);
 776                         packetLen += 2;
 777                         // also update cls.qw_outgoing_sequence
 778                         cls.qw_outgoing_sequence = conn->outgoing_unreliable_sequence;
 779                 }
 780                 if (packetLen + (sendreliable ? conn->sendMessageLength : 0) > 1400)
 781                 {
 782                         Con_Printf ("NetConn_SendUnreliableMessage: reliable message too big %u\n", data->cursize);
 783                         return -1;
 784                 }
 785
 786                 conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes += packetLen + 28;
 787
 788                 // add the reliable message if there is one
 789                 if (sendreliable)
 790                 {
 791                         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes += conn->sendMessageLength + 28;
 792                         memcpy(sendbuffer + packetLen, conn->sendMessage, conn->sendMessageLength);
 793                         packetLen += conn->sendMessageLength;
 794                         conn->qw.last_reliable_sequence = conn->outgoing_unreliable_sequence;
 795                 }
 796
 797                 // add the unreliable message if possible
 798                 if (packetLen + data->cursize <= 1400)
 799                 {
 800                         conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes += data->cursize + 28;
 801                         memcpy(sendbuffer + packetLen, data->data, data->cursize);
 802                         packetLen += data->cursize;
 803                 }
 804
 805                 NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
 806
 807                 conn->packetsSent++;
 808                 conn->unreliableMessagesSent++;
 809
 810                 totallen += packetLen + 28;
 811         }
 812         else
 813         {
 814                 unsigned int packetLen;
 815                 unsigned int dataLen;
 816                 unsigned int eom;
 817                 const void *sendme;
 818                 size_t sendmelen;
 819
 820                 // if a reliable message fragment has been lost, send it again
 821                 if (conn->sendMessageLength && (realtime - conn->lastSendTime) > 1.0)
 822                 {
 823                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 824                         {
 825                                 dataLen = conn->sendMessageLength;
 826                                 eom = NETFLAG_EOM;
 827                         }
 828                         else
 829                         {
 830                                 dataLen = MAX_PACKETFRAGMENT;
 831                                 eom = 0;
 832                         }
 833
 834                         packetLen = NET_HEADERSIZE + dataLen;
 835
 836                         StoreBigLong(sendbuffer, packetLen | (NETFLAG_DATA | eom | NetConn_AddCryptoFlag(&conn->crypto)));
 837                         StoreBigLong(sendbuffer + 4, conn->nq.sendSequence - 1);
 838                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 839
 840                         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes += packetLen + 28;
 841
 842                         sendme = Crypto_EncryptPacket(&conn->crypto, &sendbuffer, packetLen, &cryptosendbuffer, &sendmelen, sizeof(cryptosendbuffer));
 843                         if (sendme && NetConn_Write(conn->mysocket, sendme, sendmelen, &conn->peeraddress) == (int)sendmelen)
 844                         {
 845                                 conn->lastSendTime = realtime;
 846                                 conn->packetsReSent++;
 847                         }
 848
 849                         totallen += sendmelen + 28;
 850                 }
 851
 852                 // if we have a new reliable message to send, do so
 853                 if (!conn->sendMessageLength && conn->message.cursize && !quakesignon_suppressreliables)
 854                 {
 855                         if (conn->message.cursize > (int)sizeof(conn->sendMessage))
 856                         {
 857                                 Con_Printf("NetConn_SendUnreliableMessage: reliable message too big (%u > %u)\n", conn->message.cursize, (int)sizeof(conn->sendMessage));
 858                                 conn->message.overflowed = true;
 859                                 return -1;
 860                         }
 861
 862                         if (developer_networking.integer && conn == cls.netcon)
 863                         {
 864                                 Con_Print("client sending reliable message to server:\n");
 865                                 SZ_HexDumpToConsole(&conn->message);
 866                         }
 867
 868                         memcpy(conn->sendMessage, conn->message.data, conn->message.cursize);
 869                         conn->sendMessageLength = conn->message.cursize;
 870                         SZ_Clear(&conn->message);
 871
 872                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 873                         {
 874                                 dataLen = conn->sendMessageLength;
 875                                 eom = NETFLAG_EOM;
 876                         }
 877                         else
 878                         {
 879                                 dataLen = MAX_PACKETFRAGMENT;
 880                                 eom = 0;
 881                         }
 882
 883                         packetLen = NET_HEADERSIZE + dataLen;
 884
 885                         StoreBigLong(sendbuffer, packetLen | (NETFLAG_DATA | eom | NetConn_AddCryptoFlag(&conn->crypto)));
 886                         StoreBigLong(sendbuffer + 4, conn->nq.sendSequence);
 887                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 888
 889                         conn->nq.sendSequence++;
 890
 891                         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes += packetLen + 28;
 892
 893                         sendme = Crypto_EncryptPacket(&conn->crypto, &sendbuffer, packetLen, &cryptosendbuffer, &sendmelen, sizeof(cryptosendbuffer));
 894                         if(sendme)
 895                                 NetConn_Write(conn->mysocket, sendme, sendmelen, &conn->peeraddress);
 896
 897                         conn->lastSendTime = realtime;
 898                         conn->packetsSent++;
 899                         conn->reliableMessagesSent++;
 900
 901                         totallen += sendmelen + 28;
 902                 }
 903
 904                 // if we have an unreliable message to send, do so
 905                 if (data->cursize)
 906                 {
 907                         packetLen = NET_HEADERSIZE + data->cursize;
 908
 909                         if (packetLen > (int)sizeof(sendbuffer))
 910                         {
 911                                 Con_Printf("NetConn_SendUnreliableMessage: message too big %u\n", data->cursize);
 912                                 return -1;
 913                         }
 914
 915                         StoreBigLong(sendbuffer, packetLen | NETFLAG_UNRELIABLE | NetConn_AddCryptoFlag(&conn->crypto));
 916                         StoreBigLong(sendbuffer + 4, conn->outgoing_unreliable_sequence);
 917                         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
 918
 919                         conn->outgoing_unreliable_sequence++;
 920
 921                         conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes += packetLen + 28;
 922
 923                         sendme = Crypto_EncryptPacket(&conn->crypto, &sendbuffer, packetLen, &cryptosendbuffer, &sendmelen, sizeof(cryptosendbuffer));
 924                         if(sendme)
 925                                 NetConn_Write(conn->mysocket, sendme, sendmelen, &conn->peeraddress);
 926
 927                         conn->packetsSent++;
 928                         conn->unreliableMessagesSent++;
 929
 930                         totallen += sendmelen + 28;
 931                 }
 932         }
 933
 934         NetConn_UpdateCleartime(&conn->cleartime, rate, burstsize, totallen);
 935
 936         return 0;
 937 }
 938
 939 qboolean NetConn_HaveClientPorts(void)
 940 {
 941         return !!cl_numsockets;
 942 }
 943
 944 qboolean NetConn_HaveServerPorts(void)
 945 {
 946         return !!sv_numsockets;
 947 }
 948
 949 void NetConn_CloseClientPorts(void)
 950 {
 951         for (;cl_numsockets > 0;cl_numsockets--)
 952                 if (cl_sockets[cl_numsockets - 1])
 953                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 954 }
 955
 956 static void NetConn_OpenClientPort(const char *addressstring, lhnetaddresstype_t addresstype, int defaultport)
 957 {
 958         lhnetaddress_t address;
 959         lhnetsocket_t *s;
 960         int success;
 961         char addressstring2[1024];
 962         if (addressstring && addressstring[0])
 963                 success = LHNETADDRESS_FromString(&address, addressstring, defaultport);
 964         else
 965                 success = LHNETADDRESS_FromPort(&address, addresstype, defaultport);
 966         if (success)
 967         {
 968                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 969                 {
 970                         cl_sockets[cl_numsockets++] = s;
 971                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 972                         if (addresstype != LHNETADDRESSTYPE_LOOP)
 973                                 Con_Printf("Client opened a socket on address %s\n", addressstring2);
 974                 }
 975                 else
 976                 {
 977                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 978                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
 979                 }
 980         }
 981         else
 982                 Con_Printf("Client unable to parse address %s\n", addressstring);
 983 }
 984
 985 void NetConn_OpenClientPorts(void)
 986 {
 987         int port;
 988         NetConn_CloseClientPorts();
 989
 990         SV_LockThreadMutex(); // FIXME recursive?
 991         Crypto_LoadKeys(); // client sockets
 992         SV_UnlockThreadMutex();
 993
 994         port = bound(0, cl_netport.integer, 65535);
 995         if (cl_netport.integer != port)
 996                 Cvar_SetValueQuick(&cl_netport, port);
 997         if(port == 0)
 998                 Con_Printf("Client using an automatically assigned port\n");
 999         else
1000                 Con_Printf("Client using port %i\n", port);
1001         NetConn_OpenClientPort(NULL, LHNETADDRESSTYPE_LOOP, 2);
1002         NetConn_OpenClientPort(net_address.string, LHNETADDRESSTYPE_INET4, port);
1003 #ifdef SUPPORTIPV6
1004         NetConn_OpenClientPort(net_address_ipv6.string, LHNETADDRESSTYPE_INET6, port);
1005 #endif
1006 }
1007
1008 void NetConn_CloseServerPorts(void)
1009 {
1010         for (;sv_numsockets > 0;sv_numsockets--)
1011                 if (sv_sockets[sv_numsockets - 1])
1012                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
1013 }
1014
1015 static qboolean NetConn_OpenServerPort(const char *addressstring, lhnetaddresstype_t addresstype, int defaultport, int range)
1016 {
1017         lhnetaddress_t address;
1018         lhnetsocket_t *s;
1019         int port;
1020         char addressstring2[1024];
1021         int success;
1022
1023         for (port = defaultport; port <= defaultport + range; port++)
1024         {
1025                 if (addressstring && addressstring[0])
1026                         success = LHNETADDRESS_FromString(&address, addressstring, port);
1027                 else
1028                         success = LHNETADDRESS_FromPort(&address, addresstype, port);
1029                 if (success)
1030                 {
1031                         if ((s = LHNET_OpenSocket_Connectionless(&address)))
1032                         {
1033                                 sv_sockets[sv_numsockets++] = s;
1034                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
1035                                 if (addresstype != LHNETADDRESSTYPE_LOOP)
1036                                         Con_Printf("Server listening on address %s\n", addressstring2);
1037                                 return true;
1038                         }
1039                         else
1040                         {
1041                                 LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
1042                                 Con_Printf("Server failed to open socket on address %s\n", addressstring2);
1043                         }
1044                 }
1045                 else
1046                 {
1047                         Con_Printf("Server unable to parse address %s\n", addressstring);
1048                         // if it cant parse one address, it wont be able to parse another for sure
1049                         return false;
1050                 }
1051         }
1052         return false;
1053 }
1054
1055 void NetConn_OpenServerPorts(int opennetports)
1056 {
1057         int port;
1058         NetConn_CloseServerPorts();
1059
1060         SV_LockThreadMutex(); // FIXME recursive?
1061         Crypto_LoadKeys(); // server sockets
1062         SV_UnlockThreadMutex();
1063
1064         NetConn_UpdateSockets();
1065         port = bound(0, sv_netport.integer, 65535);
1066         if (port == 0)
1067                 port = 26000;
1068         Con_Printf("Server using port %i\n", port);
1069         if (sv_netport.integer != port)
1070                 Cvar_SetValueQuick(&sv_netport, port);
1071         if (cls.state != ca_dedicated)
1072                 NetConn_OpenServerPort(NULL, LHNETADDRESSTYPE_LOOP, 1, 1);
1073         if (opennetports)
1074         {
1075 #ifdef SUPPORTIPV6
1076                 qboolean ip4success = NetConn_OpenServerPort(net_address.string, LHNETADDRESSTYPE_INET4, port, 100);
1077                 NetConn_OpenServerPort(net_address_ipv6.string, LHNETADDRESSTYPE_INET6, port, ip4success ? 1 : 100);
1078 #else
1079                 NetConn_OpenServerPort(net_address.string, LHNETADDRESSTYPE_INET4, port, 100);
1080 #endif
1081         }
1082         if (sv_numsockets == 0)
1083                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!");
1084 }
1085
1086 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
1087 {
1088         int i, a = LHNETADDRESS_GetAddressType(address);
1089         for (i = 0;i < cl_numsockets;i++)
1090                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
1091                         return cl_sockets[i];
1092         return NULL;
1093 }
1094
1095 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
1096 {
1097         int i, a = LHNETADDRESS_GetAddressType(address);
1098         for (i = 0;i < sv_numsockets;i++)
1099                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
1100                         return sv_sockets[i];
1101         return NULL;
1102 }
1103
1104 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
1105 {
1106         netconn_t *conn;
1107         conn = (netconn_t *)Mem_Alloc(netconn_mempool, sizeof(*conn));
1108         conn->mysocket = mysocket;
1109         conn->peeraddress = *peeraddress;
1110         conn->lastMessageTime = realtime;
1111         conn->message.data = conn->messagedata;
1112         conn->message.maxsize = sizeof(conn->messagedata);
1113         conn->message.cursize = 0;
1114         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
1115         // reduce effectiveness of connection request floods
1116         conn->timeout = realtime + net_connecttimeout.value;
1117         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
1118         conn->next = netconn_list;
1119         netconn_list = conn;
1120         return conn;
1121 }
1122
1123 void NetConn_ClearFlood(lhnetaddress_t *peeraddress, server_floodaddress_t *floodlist, size_t floodlength);
1124 void NetConn_Close(netconn_t *conn)
1125 {
1126         netconn_t *c;
1127         // remove connection from list
1128
1129         // allow the client to reconnect immediately
1130         NetConn_ClearFlood(&(conn->peeraddress), sv.connectfloodaddresses, sizeof(sv.connectfloodaddresses) / sizeof(sv.connectfloodaddresses[0]));
1131
1132         if (conn == netconn_list)
1133                 netconn_list = conn->next;
1134         else
1135         {
1136                 for (c = netconn_list;c;c = c->next)
1137                 {
1138                         if (c->next == conn)
1139                         {
1140                                 c->next = conn->next;
1141                                 break;
1142                         }
1143                 }
1144                 // not found in list, we'll avoid crashing here...
1145                 if (!c)
1146                         return;
1147         }
1148         // free connection
1149         Mem_Free(conn);
1150 }
1151
1152 static int clientport = -1;
1153 static int clientport2 = -1;
1154 static int hostport = -1;
1155 void NetConn_UpdateSockets(void)
1156 {
1157         int i, j;
1158
1159         // TODO add logic to automatically close sockets if needed
1160         LHNET_DefaultDSCP(net_tos_dscp.integer);
1161
1162         if (cls.state != ca_dedicated)
1163         {
1164                 if (clientport2 != cl_netport.integer)
1165                 {
1166                         clientport2 = cl_netport.integer;
1167                         if (cls.state == ca_connected)
1168                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
1169                 }
1170                 if (cls.state == ca_disconnected && clientport != clientport2)
1171                 {
1172                         clientport = clientport2;
1173                         NetConn_CloseClientPorts();
1174                 }
1175                 if (cl_numsockets == 0)
1176                         NetConn_OpenClientPorts();
1177         }
1178
1179         if (hostport != sv_netport.integer)
1180         {
1181                 hostport = sv_netport.integer;
1182                 if (sv.active)
1183                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
1184         }
1185
1186         for (j = 0;j < MAX_RCONS;j++)
1187         {
1188                 i = (cls.rcon_ringpos + j + 1) % MAX_RCONS;
1189                 if(cls.rcon_commands[i][0])
1190                 {
1191                         if(realtime > cls.rcon_timeout[i])
1192                         {
1193                                 char s[128];
1194                                 LHNETADDRESS_ToString(&cls.rcon_addresses[i], s, sizeof(s), true);
1195                                 Con_Printf("rcon to %s (for command %s) failed: challenge request timed out\n", s, cls.rcon_commands[i]);
1196                                 cls.rcon_commands[i][0] = 0;
1197                                 --cls.rcon_trying;
1198                                 break;
1199                         }
1200                 }
1201         }
1202 }
1203
1204 static int NetConn_ReceivedMessage(netconn_t *conn, const unsigned char *data, size_t length, protocolversion_t protocol, double newtimeout)
1205 {
1206         int originallength = length;
1207         unsigned char sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
1208         unsigned char cryptosendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE+CRYPTO_HEADERSIZE];
1209         unsigned char cryptoreadbuffer[NET_HEADERSIZE+NET_MAXMESSAGE+CRYPTO_HEADERSIZE];
1210         if (length < 8)
1211                 return 0;
1212
1213         if (protocol == PROTOCOL_QUAKEWORLD)
1214         {
1215                 int sequence, sequence_ack;
1216                 int reliable_ack, reliable_message;
1217                 int count;
1218                 //int qport;
1219
1220                 sequence = LittleLong(*((int *)(data + 0)));
1221                 sequence_ack = LittleLong(*((int *)(data + 4)));
1222                 data += 8;
1223                 length -= 8;
1224
1225                 if (conn != cls.netcon)
1226                 {
1227                         // server only
1228                         if (length < 2)
1229                                 return 0;
1230                         // TODO: use qport to identify that this client really is who they say they are?  (and elsewhere in the code to identify the connection without a port match?)
1231                         //qport = LittleShort(*((int *)(data + 8)));
1232                         data += 2;
1233                         length -= 2;
1234                 }
1235
1236                 conn->packetsReceived++;
1237                 reliable_message = (sequence >> 31) & 1;
1238                 reliable_ack = (sequence_ack >> 31) & 1;
1239                 sequence &= ~(1<<31);
1240                 sequence_ack &= ~(1<<31);
1241                 if (sequence <= conn->qw.incoming_sequence)
1242                 {
1243                         //Con_DPrint("Got a stale datagram\n");
1244                         return 0;
1245                 }
1246                 count = sequence - (conn->qw.incoming_sequence + 1);
1247                 if (count > 0)
1248                 {
1249                         conn->droppedDatagrams += count;
1250                         //Con_DPrintf("Dropped %u datagram(s)\n", count);
1251                         while (count--)
1252                         {
1253                                 conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1254                                 conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1255                                 conn->incoming_netgraph[conn->incoming_packetcounter].cleartime       = conn->incoming_cleartime;
1256                                 conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = NETGRAPH_LOSTPACKET;
1257                                 conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1258                                 conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1259                         }
1260                 }
1261                 conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1262                 conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1263                 conn->incoming_netgraph[conn->incoming_packetcounter].cleartime       = conn->incoming_cleartime;
1264                 conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = originallength + 28;
1265                 conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1266                 conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1267                 NetConn_UpdateCleartime(&conn->incoming_cleartime, cl_rate.integer, cl_rate_burstsize.integer, originallength + 28);
1268
1269                 // limit bursts to one packet in size ("dialup mode" emulating old behaviour)
1270                 if (net_test.integer)
1271                 {
1272                         if (conn->cleartime < realtime)
1273                                 conn->cleartime = realtime;
1274                 }
1275
1276                 if (reliable_ack == conn->qw.reliable_sequence)
1277                 {
1278                         // received, now we will be able to send another reliable message
1279                         conn->sendMessageLength = 0;
1280                         conn->reliableMessagesReceived++;
1281                 }
1282                 conn->qw.incoming_sequence = sequence;
1283                 if (conn == cls.netcon)
1284                         cls.qw_incoming_sequence = conn->qw.incoming_sequence;
1285                 conn->qw.incoming_acknowledged = sequence_ack;
1286                 conn->qw.incoming_reliable_acknowledged = reliable_ack;
1287                 if (reliable_message)
1288                         conn->qw.incoming_reliable_sequence ^= 1;
1289                 conn->lastMessageTime = realtime;
1290                 conn->timeout = realtime + newtimeout;
1291                 conn->unreliableMessagesReceived++;
1292                 if (conn == cls.netcon)
1293                 {
1294                         SZ_Clear(&cl_message);
1295                         SZ_Write(&cl_message, data, length);
1296                         MSG_BeginReading(&cl_message);
1297                 }
1298                 else
1299                 {
1300                         SZ_Clear(&sv_message);
1301                         SZ_Write(&sv_message, data, length);
1302                         MSG_BeginReading(&sv_message);
1303                 }
1304                 return 2;
1305         }
1306         else
1307         {
1308                 unsigned int count;
1309                 unsigned int flags;
1310                 unsigned int sequence;
1311                 size_t qlength;
1312                 const void *sendme;
1313                 size_t sendmelen;
1314
1315                 originallength = length;
1316                 data = (const unsigned char *) Crypto_DecryptPacket(&conn->crypto, data, length, cryptoreadbuffer, &length, sizeof(cryptoreadbuffer));
1317                 if(!data)
1318                         return 0;
1319                 if(length < 8)
1320                         return 0;
1321
1322                 qlength = (unsigned int)BuffBigLong(data);
1323                 flags = qlength & ~NETFLAG_LENGTH_MASK;
1324                 qlength &= NETFLAG_LENGTH_MASK;
1325                 // control packets were already handled
1326                 if (!(flags & NETFLAG_CTL) && qlength == length)
1327                 {
1328                         sequence = BuffBigLong(data + 4);
1329                         conn->packetsReceived++;
1330                         data += 8;
1331                         length -= 8;
1332                         if (flags & NETFLAG_UNRELIABLE)
1333                         {
1334                                 if (sequence >= conn->nq.unreliableReceiveSequence)
1335                                 {
1336                                         if (sequence > conn->nq.unreliableReceiveSequence)
1337                                         {
1338                                                 count = sequence - conn->nq.unreliableReceiveSequence;
1339                                                 conn->droppedDatagrams += count;
1340                                                 //Con_DPrintf("Dropped %u datagram(s)\n", count);
1341                                                 while (count--)
1342                                                 {
1343                                                         conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1344                                                         conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1345                                                         conn->incoming_netgraph[conn->incoming_packetcounter].cleartime       = conn->incoming_cleartime;
1346                                                         conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = NETGRAPH_LOSTPACKET;
1347                                                         conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1348                                                         conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1349                                                 }
1350                                         }
1351                                         conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1352                                         conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1353                                         conn->incoming_netgraph[conn->incoming_packetcounter].cleartime       = conn->incoming_cleartime;
1354                                         conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = originallength + 28;
1355                                         conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1356                                         conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1357                                         NetConn_UpdateCleartime(&conn->incoming_cleartime, cl_rate.integer, cl_rate_burstsize.integer, originallength + 28);
1358
1359                                         conn->nq.unreliableReceiveSequence = sequence + 1;
1360                                         conn->lastMessageTime = realtime;
1361                                         conn->timeout = realtime + newtimeout;
1362                                         conn->unreliableMessagesReceived++;
1363                                         if (length > 0)
1364                                         {
1365                                                 if (conn == cls.netcon)
1366                                                 {
1367                                                         SZ_Clear(&cl_message);
1368                                                         SZ_Write(&cl_message, data, length);
1369                                                         MSG_BeginReading(&cl_message);
1370                                                 }
1371                                                 else
1372                                                 {
1373                                                         SZ_Clear(&sv_message);
1374                                                         SZ_Write(&sv_message, data, length);
1375                                                         MSG_BeginReading(&sv_message);
1376                                                 }
1377                                                 return 2;
1378                                         }
1379                                 }
1380                                 //else
1381                                 //      Con_DPrint("Got a stale datagram\n");
1382                                 return 1;
1383                         }
1384                         else if (flags & NETFLAG_ACK)
1385                         {
1386                                 conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes += originallength + 28;
1387                                 NetConn_UpdateCleartime(&conn->incoming_cleartime, cl_rate.integer, cl_rate_burstsize.integer, originallength + 28);
1388
1389                                 if (sequence == (conn->nq.sendSequence - 1))
1390                                 {
1391                                         if (sequence == conn->nq.ackSequence)
1392                                         {
1393                                                 conn->nq.ackSequence++;
1394                                                 if (conn->nq.ackSequence != conn->nq.sendSequence)
1395                                                         Con_DPrint("ack sequencing error\n");
1396                                                 conn->lastMessageTime = realtime;
1397                                                 conn->timeout = realtime + newtimeout;
1398                                                 if (conn->sendMessageLength > MAX_PACKETFRAGMENT)
1399                                                 {
1400                                                         unsigned int packetLen;
1401                                                         unsigned int dataLen;
1402                                                         unsigned int eom;
1403
1404                                                         conn->sendMessageLength -= MAX_PACKETFRAGMENT;
1405                                                         memmove(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
1406
1407                                                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
1408                                                         {
1409                                                                 dataLen = conn->sendMessageLength;
1410                                                                 eom = NETFLAG_EOM;
1411                                                         }
1412                                                         else
1413                                                         {
1414                                                                 dataLen = MAX_PACKETFRAGMENT;
1415                                                                 eom = 0;
1416                                                         }
1417
1418                                                         packetLen = NET_HEADERSIZE + dataLen;
1419
1420                                                         StoreBigLong(sendbuffer, packetLen | (NETFLAG_DATA | eom | NetConn_AddCryptoFlag(&conn->crypto)));
1421                                                         StoreBigLong(sendbuffer + 4, conn->nq.sendSequence);
1422                                                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
1423
1424                                                         conn->nq.sendSequence++;
1425
1426                                                         sendme = Crypto_EncryptPacket(&conn->crypto, &sendbuffer, packetLen, &cryptosendbuffer, &sendmelen, sizeof(cryptosendbuffer));
1427                                                         if (sendme && NetConn_Write(conn->mysocket, sendme, sendmelen, &conn->peeraddress) == (int)sendmelen)
1428                                                         {
1429                                                                 conn->lastSendTime = realtime;
1430                                                                 conn->packetsSent++;
1431                                                         }
1432                                                 }
1433                                                 else
1434                                                         conn->sendMessageLength = 0;
1435                                         }
1436                                         //else
1437                                         //      Con_DPrint("Duplicate ACK received\n");
1438                                 }
1439                                 //else
1440                                 //      Con_DPrint("Stale ACK received\n");
1441                                 return 1;
1442                         }
1443                         else if (flags & NETFLAG_DATA)
1444                         {
1445                                 unsigned char temppacket[8];
1446                                 conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   += originallength + 28;
1447                                 NetConn_UpdateCleartime(&conn->incoming_cleartime, cl_rate.integer, cl_rate_burstsize.integer, originallength + 28);
1448
1449                                 conn->outgoing_netgraph[conn->outgoing_packetcounter].ackbytes        += 8 + 28;
1450
1451                                 StoreBigLong(temppacket, 8 | NETFLAG_ACK | NetConn_AddCryptoFlag(&conn->crypto));
1452                                 StoreBigLong(temppacket + 4, sequence);
1453                                 sendme = Crypto_EncryptPacket(&conn->crypto, temppacket, 8, &cryptosendbuffer, &sendmelen, sizeof(cryptosendbuffer));
1454                                 if(sendme)
1455                                         NetConn_Write(conn->mysocket, sendme, sendmelen, &conn->peeraddress);
1456                                 if (sequence == conn->nq.receiveSequence)
1457                                 {
1458                                         conn->lastMessageTime = realtime;
1459                                         conn->timeout = realtime + newtimeout;
1460                                         conn->nq.receiveSequence++;
1461                                         if( conn->receiveMessageLength + length <= (int)sizeof( conn->receiveMessage ) ) {
1462                                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
1463                                                 conn->receiveMessageLength += length;
1464                                         } else {
1465                                                 Con_Printf( "Reliable message (seq: %i) too big for message buffer!\n"
1466                                                                         "Dropping the message!\n", sequence );
1467                                                 conn->receiveMessageLength = 0;
1468                                                 return 1;
1469                                         }
1470                                         if (flags & NETFLAG_EOM)
1471                                         {
1472                                                 conn->reliableMessagesReceived++;
1473                                                 length = conn->receiveMessageLength;
1474                                                 conn->receiveMessageLength = 0;
1475                                                 if (length > 0)
1476                                                 {
1477                                                         if (conn == cls.netcon)
1478                                                         {
1479                                                                 SZ_Clear(&cl_message);
1480                                                                 SZ_Write(&cl_message, conn->receiveMessage, length);
1481                                                                 MSG_BeginReading(&cl_message);
1482                                                         }
1483                                                         else
1484                                                         {
1485                                                                 SZ_Clear(&sv_message);
1486                                                                 SZ_Write(&sv_message, conn->receiveMessage, length);
1487                                                                 MSG_BeginReading(&sv_message);
1488                                                         }
1489                                                         return 2;
1490                                                 }
1491                                         }
1492                                 }
1493                                 else
1494                                         conn->receivedDuplicateCount++;
1495                                 return 1;
1496                         }
1497                 }
1498         }
1499         return 0;
1500 }
1501
1502 static void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress, protocolversion_t initialprotocol)
1503 {
1504         crypto_t *crypto;
1505         cls.connect_trying = false;
1506 #ifdef CONFIG_MENU
1507         M_Update_Return_Reason("");
1508 #endif
1509         // the connection request succeeded, stop current connection and set up a new connection
1510         CL_Disconnect();
1511         // if we're connecting to a remote server, shut down any local server
1512         if (LHNETADDRESS_GetAddressType(peeraddress) != LHNETADDRESSTYPE_LOOP && sv.active)
1513         {
1514                 SV_LockThreadMutex();
1515                 Host_ShutdownServer ();
1516                 SV_UnlockThreadMutex();
1517         }
1518         // allocate a net connection to keep track of things
1519         cls.netcon = NetConn_Open(mysocket, peeraddress);
1520         crypto = &cls.netcon->crypto;
1521         if(cls.crypto.authenticated)
1522         {
1523                 Crypto_FinishInstance(crypto, &cls.crypto);
1524                 Con_Printf("%s connection to %s has been established: server is %s@%.*s, I am %.*s@%.*s\n",
1525                                 crypto->use_aes ? "Encrypted" : "Authenticated",
1526                                 cls.netcon->address,
1527                                 crypto->server_idfp[0] ? crypto->server_idfp : "-",
1528                                 crypto_keyfp_recommended_length, crypto->server_keyfp[0] ? crypto->server_keyfp : "-",
1529                                 crypto_keyfp_recommended_length, crypto->client_idfp[0] ? crypto->client_idfp : "-",
1530                                 crypto_keyfp_recommended_length, crypto->client_keyfp[0] ? crypto->client_keyfp : "-"
1531                                 );
1532         }
1533         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
1534         key_dest = key_game;
1535 #ifdef CONFIG_MENU
1536         m_state = m_none;
1537 #endif
1538         cls.demonum = -1;                       // not in the demo loop now
1539         cls.state = ca_connected;
1540         cls.signon = 0;                         // need all the signon messages before playing
1541         cls.protocol = initialprotocol;
1542         // reset move sequence numbering on this new connection
1543         cls.servermovesequence = 0;
1544         if (cls.protocol == PROTOCOL_QUAKEWORLD)
1545                 Cmd_ForwardStringToServer("new");
1546         if (cls.protocol == PROTOCOL_QUAKE)
1547         {
1548                 // write a keepalive (clc_nop) as it seems to greatly improve the
1549                 // chances of connecting to a netquake server
1550                 sizebuf_t msg;
1551                 unsigned char buf[4];
1552                 memset(&msg, 0, sizeof(msg));
1553                 msg.data = buf;
1554                 msg.maxsize = sizeof(buf);
1555                 MSG_WriteChar(&msg, clc_nop);
1556                 NetConn_SendUnreliableMessage(cls.netcon, &msg, cls.protocol, 10000, 0, false);
1557         }
1558 }
1559
1560 int NetConn_IsLocalGame(void)
1561 {
1562         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
1563                 return true;
1564         return false;
1565 }
1566
1567 #ifdef CONFIG_MENU
1568 static int NetConn_ClientParsePacket_ServerList_ProcessReply(const char *addressstring)
1569 {
1570         int n;
1571         int pingtime;
1572         serverlist_entry_t *entry = NULL;
1573
1574         // search the cache for this server and update it
1575         for (n = 0;n < serverlist_cachecount;n++) {
1576                 entry = &serverlist_cache[ n ];
1577                 if (!strcmp(addressstring, entry->info.cname))
1578                         break;
1579         }
1580
1581         if (n == serverlist_cachecount)
1582         {
1583                 // LAN search doesnt require an answer from the master server so we wont
1584                 // know the ping nor will it be initialized already...
1585
1586                 // find a slot
1587                 if (serverlist_cachecount == SERVERLIST_TOTALSIZE)
1588                         return -1;
1589
1590                 if (serverlist_maxcachecount <= serverlist_cachecount)
1591                 {
1592                         serverlist_maxcachecount += 64;
1593                         serverlist_cache = (serverlist_entry_t *)Mem_Realloc(netconn_mempool, (void *)serverlist_cache, sizeof(serverlist_entry_t) * serverlist_maxcachecount);
1594                 }
1595                 entry = &serverlist_cache[n];
1596
1597                 memset(entry, 0, sizeof(*entry));
1598                 // store the data the engine cares about (address and ping)
1599                 strlcpy(entry->info.cname, addressstring, sizeof(entry->info.cname));
1600                 entry->info.ping = 100000;
1601                 entry->querytime = realtime;
1602                 // if not in the slist menu we should print the server to console
1603                 if (serverlist_consoleoutput)
1604                         Con_Printf("querying %s\n", addressstring);
1605                 ++serverlist_cachecount;
1606         }
1607         // if this is the first reply from this server, count it as having replied
1608         pingtime = (int)((realtime - entry->querytime) * 1000.0 + 0.5);
1609         pingtime = bound(0, pingtime, 9999);
1610         if (entry->query == SQS_REFRESHING) {
1611                 entry->info.ping = pingtime;
1612                 entry->query = SQS_QUERIED;
1613         } else {
1614                 // convert to unsigned to catch the -1
1615                 // I still dont like this but its better than the old 10000 magic ping number - as in easier to type and read :( [11/8/2007 Black]
1616                 entry->info.ping = min((unsigned) entry->info.ping, (unsigned) pingtime);
1617                 serverreplycount++;
1618         }
1619
1620         // other server info is updated by the caller
1621         return n;
1622 }
1623
1624 static void NetConn_ClientParsePacket_ServerList_UpdateCache(int n)
1625 {
1626         serverlist_entry_t *entry = &serverlist_cache[n];
1627         serverlist_info_t *info = &entry->info;
1628         // update description strings for engine menu and console output
1629         dpsnprintf(entry->line1, sizeof(serverlist_cache[n].line1), "^%c%5d^7 ^%c%3u^7/%3u %-65.65s", info->ping >= 300 ? '1' : (info->ping >= 200 ? '3' : '7'), (int)info->ping, ((info->numhumans > 0 && info->numhumans < info->maxplayers) ? (info->numhumans >= 4 ? '7' : '3') : '1'), info->numplayers, info->maxplayers, info->name);
1630         dpsnprintf(entry->line2, sizeof(serverlist_cache[n].line2), "^4%-21.21s %-19.19s ^%c%-17.17s^4 %-20.20s", info->cname, info->game,
1631                         (
1632                          info->gameversion != gameversion.integer
1633                          &&
1634                          !(
1635                                     gameversion_min.integer >= 0 // min/max range set by user/mod?
1636                                  && gameversion_max.integer >= 0
1637                                  && gameversion_min.integer <= info->gameversion // version of server in min/max range?
1638                                  && gameversion_max.integer >= info->gameversion
1639                           )
1640                         ) ? '1' : '4',
1641                         info->mod, info->map);
1642         if (entry->query == SQS_QUERIED)
1643         {
1644                 if(!serverlist_paused)
1645                         ServerList_ViewList_Remove(entry);
1646         }
1647         // if not in the slist menu we should print the server to console (if wanted)
1648         else if( serverlist_consoleoutput )
1649                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1650         // and finally, update the view set
1651         if(!serverlist_paused)
1652                 ServerList_ViewList_Insert( entry );
1653         //      update the entry's state
1654         serverlist_cache[n].query = SQS_QUERIED;
1655 }
1656
1657 // returns true, if it's sensible to continue the processing
1658 static qboolean NetConn_ClientParsePacket_ServerList_PrepareQuery( int protocol, const char *ipstring, qboolean isfavorite ) {
1659         int n;
1660         serverlist_entry_t *entry;
1661
1662         //      ignore the rest of the message if the serverlist is full
1663         if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1664                 return false;
1665         //      also ignore     it      if      we      have already queried    it      (other master server    response)
1666         for( n =        0 ; n   < serverlist_cachecount ; n++   )
1667                 if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1668                         break;
1669
1670         if( n < serverlist_cachecount ) {
1671                 // the entry has already been queried once or
1672                 return true;
1673         }
1674
1675         if (serverlist_maxcachecount <= n)
1676         {
1677                 serverlist_maxcachecount += 64;
1678                 serverlist_cache = (serverlist_entry_t *)Mem_Realloc(netconn_mempool, (void *)serverlist_cache, sizeof(serverlist_entry_t) * serverlist_maxcachecount);
1679         }
1680
1681         entry = &serverlist_cache[n];
1682
1683         memset(entry, 0, sizeof(*entry));
1684         entry->protocol =       protocol;
1685         //      store   the data        the engine cares about (address and     ping)
1686         strlcpy (entry->info.cname, ipstring, sizeof(entry->info.cname));
1687
1688         entry->info.isfavorite = isfavorite;
1689
1690         // no, then reset the ping right away
1691         entry->info.ping = -1;
1692         // we also want to increase the serverlist_cachecount then
1693         serverlist_cachecount++;
1694         serverquerycount++;
1695
1696         entry->query =  SQS_QUERYING;
1697
1698         return true;
1699 }
1700
1701 static void NetConn_ClientParsePacket_ServerList_ParseDPList(lhnetaddress_t *senderaddress, const unsigned char *data, int length, qboolean isextended)
1702 {
1703         masterreplycount++;
1704         if (serverlist_consoleoutput)
1705                 Con_Printf("received DarkPlaces %sserver list...\n", isextended ? "extended " : "");
1706         while (length >= 7)
1707         {
1708                 char ipstring [128];
1709
1710                 // IPv4 address
1711                 if (data[0] == '\\')
1712                 {
1713                         unsigned short port = data[5] * 256 + data[6];
1714
1715                         if (port != 0 && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF))
1716                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%hu", data[1], data[2], data[3], data[4], port);
1717
1718                         // move on to next address in packet
1719                         data += 7;
1720                         length -= 7;
1721                 }
1722                 // IPv6 address
1723                 else if (data[0] == '/' && isextended && length >= 19)
1724                 {
1725                         unsigned short port = data[17] * 256 + data[18];
1726
1727                         if (port != 0)
1728                         {
1729 #ifdef WHY_JUST_WHY
1730                                 const char *ifname;
1731                                 char ifnamebuf[16];
1732
1733                                 /// \TODO: make some basic checks of the IP address (broadcast, ...)
1734
1735                                 ifname = LHNETADDRESS_GetInterfaceName(senderaddress, ifnamebuf, sizeof(ifnamebuf));
1736                                 if (ifname != NULL)
1737                                 {
1738                                         dpsnprintf (ipstring, sizeof (ipstring), "[%x:%x:%x:%x:%x:%x:%x:%x%%%s]:%hu",
1739                                                                 (data[1] << 8) | data[2], (data[3] << 8) | data[4], (data[5] << 8) | data[6], (data[7] << 8) | data[8],
1740                                                                 (data[9] << 8) | data[10], (data[11] << 8) | data[12], (data[13] << 8) | data[14], (data[15] << 8) | data[16],
1741                                                                 ifname, port);
1742                                 }
1743                                 else
1744 #endif
1745                                 {
1746                                         dpsnprintf (ipstring, sizeof (ipstring), "[%x:%x:%x:%x:%x:%x:%x:%x]:%hu",
1747                                                                 (data[1] << 8) | data[2], (data[3] << 8) | data[4], (data[5] << 8) | data[6], (data[7] << 8) | data[8],
1748                                                                 (data[9] << 8) | data[10], (data[11] << 8) | data[12], (data[13] << 8) | data[14], (data[15] << 8) | data[16],
1749                                                                 port);
1750                                 }
1751                         }
1752
1753                         // move on to next address in packet
1754                         data += 19;
1755                         length -= 19;
1756                 }
1757                 else
1758                 {
1759                         Con_Print("Error while parsing the server list\n");
1760                         break;
1761                 }
1762
1763                 if (serverlist_consoleoutput && developer_networking.integer)
1764                         Con_Printf("Requesting info from DarkPlaces server %s\n", ipstring);
1765
1766                 if( !NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_DARKPLACES7, ipstring, false ) ) {
1767                         break;
1768                 }
1769
1770         }
1771
1772         // begin or resume serverlist queries
1773         serverlist_querysleep = false;
1774         serverlist_querywaittime = realtime + 3;
1775 }
1776 #endif
1777
1778 static int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1779 {
1780         qboolean fromserver;
1781         int ret, c;
1782         char *string, addressstring2[128];
1783         char stringbuf[16384];
1784         char senddata[NET_HEADERSIZE+NET_MAXMESSAGE+CRYPTO_HEADERSIZE];
1785         size_t sendlength;
1786 #ifdef CONFIG_MENU
1787         char infostringvalue[MAX_INPUTLINE];
1788         char ipstring[32];
1789         const char *s;
1790 #endif
1791         char vabuf[1024];
1792
1793         // quakeworld ingame packet
1794         fromserver = cls.netcon && mysocket == cls.netcon->mysocket && !LHNETADDRESS_Compare(&cls.netcon->peeraddress, peeraddress);
1795
1796         // convert the address to a string incase we need it
1797         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1798
1799         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1800         {
1801                 // received a command string - strip off the packaging and put it
1802                 // into our string buffer with NULL termination
1803                 data += 4;
1804                 length -= 4;
1805                 length = min(length, (int)sizeof(stringbuf) - 1);
1806                 memcpy(stringbuf, data, length);
1807                 stringbuf[length] = 0;
1808                 string = stringbuf;
1809
1810                 if (developer_networking.integer)
1811                 {
1812                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
1813                         Com_HexDumpToConsole(data, length);
1814                 }
1815
1816                 sendlength = sizeof(senddata) - 4;
1817                 switch(Crypto_ClientParsePacket(string, length, senddata+4, &sendlength, peeraddress))
1818                 {
1819                         case CRYPTO_NOMATCH:
1820                                 // nothing to do
1821                                 break;
1822                         case CRYPTO_MATCH:
1823                                 if(sendlength)
1824                                 {
1825                                         memcpy(senddata, "\377\377\377\377", 4);
1826                                         NetConn_Write(mysocket, senddata, sendlength+4, peeraddress);
1827                                 }
1828                                 break;
1829                         case CRYPTO_DISCARD:
1830                                 if(sendlength)
1831                                 {
1832                                         memcpy(senddata, "\377\377\377\377", 4);
1833                                         NetConn_Write(mysocket, senddata, sendlength+4, peeraddress);
1834                                 }
1835                                 return true;
1836                                 break;
1837                         case CRYPTO_REPLACE:
1838                                 string = senddata+4;
1839                                 length = sendlength;
1840                                 break;
1841                 }
1842
1843                 if (length >= 10 && !memcmp(string, "challenge ", 10) && cls.rcon_trying)
1844                 {
1845                         int i = 0, j;
1846                         for (j = 0;j < MAX_RCONS;j++)
1847                         {
1848                                 // note: this value from i is used outside the loop too...
1849                                 i = (cls.rcon_ringpos + j) % MAX_RCONS;
1850                                 if(cls.rcon_commands[i][0])
1851                                         if (!LHNETADDRESS_Compare(peeraddress, &cls.rcon_addresses[i]))
1852                                                 break;
1853                         }
1854                         if (j < MAX_RCONS)
1855                         {
1856                                 char buf[1500];
1857                                 char argbuf[1500];
1858                                 const char *e;
1859                                 int n;
1860                                 dpsnprintf(argbuf, sizeof(argbuf), "%s %s", string + 10, cls.rcon_commands[i]);
1861                                 memcpy(buf, "\377\377\377\377srcon HMAC-MD4 CHALLENGE ", 29);
1862
1863                                 e = strchr(rcon_password.string, ' ');
1864                                 n = e ? e-rcon_password.string : (int)strlen(rcon_password.string);
1865
1866                                 if(HMAC_MDFOUR_16BYTES((unsigned char *) (buf + 29), (unsigned char *) argbuf, strlen(argbuf), (unsigned char *) rcon_password.string, n))
1867                                 {
1868                                         int k;
1869                                         buf[45] = ' ';
1870                                         strlcpy(buf + 46, argbuf, sizeof(buf) - 46);
1871                                         NetConn_Write(mysocket, buf, 46 + strlen(buf + 46), peeraddress);
1872                                         cls.rcon_commands[i][0] = 0;
1873                                         --cls.rcon_trying;
1874
1875                                         for (k = 0;k < MAX_RCONS;k++)
1876                                                 if(cls.rcon_commands[k][0])
1877                                                         if (!LHNETADDRESS_Compare(peeraddress, &cls.rcon_addresses[k]))
1878                                                                 break;
1879                                         if(k < MAX_RCONS)
1880                                         {
1881                                                 int l;
1882                                                 NetConn_WriteString(mysocket, "\377\377\377\377getchallenge", peeraddress);
1883                                                 // extend the timeout on other requests as we asked for a challenge
1884                                                 for (l = 0;l < MAX_RCONS;l++)
1885                                                         if(cls.rcon_commands[l][0])
1886                                                                 if (!LHNETADDRESS_Compare(peeraddress, &cls.rcon_addresses[l]))
1887                                                                         cls.rcon_timeout[l] = realtime + rcon_secure_challengetimeout.value;
1888                                         }
1889
1890                                         return true; // we used up the challenge, so we can't use this oen for connecting now anyway
1891                                 }
1892                         }
1893                 }
1894                 if (length >= 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
1895                 {
1896                         // darkplaces or quake3
1897                         char protocolnames[1400];
1898                         Protocol_Names(protocolnames, sizeof(protocolnames));
1899                         Con_DPrintf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
1900 #ifdef CONFIG_MENU
1901                         M_Update_Return_Reason("Got challenge response");
1902 #endif
1903                         // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1904                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1905                         // TODO: add userinfo stuff here instead of using NQ commands?
1906                         NetConn_WriteString(mysocket, va(vabuf, sizeof(vabuf), "\377\377\377\377connect\\protocol\\darkplaces 3\\protocols\\%s%s\\challenge\\%s", protocolnames, cls.connect_userinfo, string + 10), peeraddress);
1907                         return true;
1908                 }
1909                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
1910                 {
1911                         // darkplaces or quake3
1912 #ifdef CONFIG_MENU
1913                         M_Update_Return_Reason("Accepted");
1914 #endif
1915                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_DARKPLACES3);
1916                         return true;
1917                 }
1918                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
1919                 {
1920                         char rejectreason[128];
1921                         cls.connect_trying = false;
1922                         string += 7;
1923                         length = min(length - 7, (int)sizeof(rejectreason) - 1);
1924                         memcpy(rejectreason, string, length);
1925                         rejectreason[length] = 0;
1926 #ifdef CONFIG_MENU
1927                         M_Update_Return_Reason(rejectreason);
1928 #endif
1929                         return true;
1930                 }
1931 #ifdef CONFIG_MENU
1932                 if (length >= 15 && !memcmp(string, "statusResponse\x0A", 15))
1933                 {
1934                         serverlist_info_t *info;
1935                         char *p;
1936                         int n;
1937
1938                         string += 15;
1939                         // search the cache for this server and update it
1940                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1941                         if (n < 0)
1942                                 return true;
1943
1944                         info = &serverlist_cache[n].info;
1945                         info->game[0] = 0;
1946                         info->mod[0]  = 0;
1947                         info->map[0]  = 0;
1948                         info->name[0] = 0;
1949                         info->qcstatus[0] = 0;
1950                         info->players[0] = 0;
1951                         info->protocol = -1;
1952                         info->numplayers = 0;
1953                         info->numbots = -1;
1954                         info->maxplayers  = 0;
1955                         info->gameversion = 0;
1956
1957                         p = strchr(string, '\n');
1958                         if(p)
1959                         {
1960                                 *p = 0; // cut off the string there
1961                                 ++p;
1962                         }
1963                         else
1964                                 Con_Printf("statusResponse without players block?\n");
1965
1966                         if ((s = InfoString_GetValue(string, "gamename"     , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->game, s, sizeof (info->game));
1967                         if ((s = InfoString_GetValue(string, "modname"      , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));
1968                         if ((s = InfoString_GetValue(string, "mapname"      , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->map , s, sizeof (info->map ));
1969                         if ((s = InfoString_GetValue(string, "hostname"     , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->name, s, sizeof (info->name));
1970                         if ((s = InfoString_GetValue(string, "protocol"     , infostringvalue, sizeof(infostringvalue))) != NULL) info->protocol = atoi(s);
1971                         if ((s = InfoString_GetValue(string, "clients"      , infostringvalue, sizeof(infostringvalue))) != NULL) info->numplayers = atoi(s);
1972                         if ((s = InfoString_GetValue(string, "bots"         , infostringvalue, sizeof(infostringvalue))) != NULL) info->numbots = atoi(s);
1973                         if ((s = InfoString_GetValue(string, "sv_maxclients", infostringvalue, sizeof(infostringvalue))) != NULL) info->maxplayers = atoi(s);
1974                         if ((s = InfoString_GetValue(string, "gameversion"  , infostringvalue, sizeof(infostringvalue))) != NULL) info->gameversion = atoi(s);
1975                         if ((s = InfoString_GetValue(string, "qcstatus"     , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->qcstatus, s, sizeof(info->qcstatus));
1976                         if (p                                                                                         != NULL) strlcpy(info->players, p, sizeof(info->players));
1977                         info->numhumans = info->numplayers - max(0, info->numbots);
1978                         info->freeslots = info->maxplayers - info->numplayers;
1979
1980                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1981
1982                         return true;
1983                 }
1984                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1985                 {
1986                         serverlist_info_t *info;
1987                         int n;
1988
1989                         string += 13;
1990                         // search the cache for this server and update it
1991                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1992                         if (n < 0)
1993                                 return true;
1994
1995                         info = &serverlist_cache[n].info;
1996                         info->game[0] = 0;
1997                         info->mod[0]  = 0;
1998                         info->map[0]  = 0;
1999                         info->name[0] = 0;
2000                         info->qcstatus[0] = 0;
2001                         info->players[0] = 0;
2002                         info->protocol = -1;
2003                         info->numplayers = 0;
2004                         info->numbots = -1;
2005                         info->maxplayers  = 0;
2006                         info->gameversion = 0;
2007
2008                         if ((s = InfoString_GetValue(string, "gamename"     , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->game, s, sizeof (info->game));
2009                         if ((s = InfoString_GetValue(string, "modname"      , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));
2010                         if ((s = InfoString_GetValue(string, "mapname"      , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->map , s, sizeof (info->map ));
2011                         if ((s = InfoString_GetValue(string, "hostname"     , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->name, s, sizeof (info->name));
2012                         if ((s = InfoString_GetValue(string, "protocol"     , infostringvalue, sizeof(infostringvalue))) != NULL) info->protocol = atoi(s);
2013                         if ((s = InfoString_GetValue(string, "clients"      , infostringvalue, sizeof(infostringvalue))) != NULL) info->numplayers = atoi(s);
2014                         if ((s = InfoString_GetValue(string, "bots"         , infostringvalue, sizeof(infostringvalue))) != NULL) info->numbots = atoi(s);
2015                         if ((s = InfoString_GetValue(string, "sv_maxclients", infostringvalue, sizeof(infostringvalue))) != NULL) info->maxplayers = atoi(s);
2016                         if ((s = InfoString_GetValue(string, "gameversion"  , infostringvalue, sizeof(infostringvalue))) != NULL) info->gameversion = atoi(s);
2017                         if ((s = InfoString_GetValue(string, "qcstatus"     , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->qcstatus, s, sizeof(info->qcstatus));
2018                         info->numhumans = info->numplayers - max(0, info->numbots);
2019                         info->freeslots = info->maxplayers - info->numplayers;
2020
2021                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
2022
2023                         return true;
2024                 }
2025                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
2026                 {
2027                         // Extract the IP addresses
2028                         data += 18;
2029                         length -= 18;
2030                         NetConn_ClientParsePacket_ServerList_ParseDPList(peeraddress, data, length, false);
2031                         return true;
2032                 }
2033                 if (!strncmp(string, "getserversExtResponse", 21) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
2034                 {
2035                         // Extract the IP addresses
2036                         data += 21;
2037                         length -= 21;
2038                         NetConn_ClientParsePacket_ServerList_ParseDPList(peeraddress, data, length, true);
2039                         return true;
2040                 }
2041                 if (!memcmp(string, "d\n", 2) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
2042                 {
2043                         // Extract the IP addresses
2044                         data += 2;
2045                         length -= 2;
2046                         masterreplycount++;
2047                         if (serverlist_consoleoutput)
2048                                 Con_Printf("received QuakeWorld server list from %s...\n", addressstring2);
2049                         while (length >= 6 && (data[0] != 0xFF || data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF) && data[4] * 256 + data[5] != 0)
2050                         {
2051                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[0], data[1], data[2], data[3], data[4] * 256 + data[5]);
2052                                 if (serverlist_consoleoutput && developer_networking.integer)
2053                                         Con_Printf("Requesting info from QuakeWorld server %s\n", ipstring);
2054
2055                                 if( !NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_QUAKEWORLD, ipstring, false ) ) {
2056                                         break;
2057                                 }
2058
2059                                 // move on to next address in packet
2060                                 data += 6;
2061                                 length -= 6;
2062                         }
2063                         // begin or resume serverlist queries
2064                         serverlist_querysleep = false;
2065                         serverlist_querywaittime = realtime + 3;
2066                         return true;
2067                 }
2068 #endif
2069                 if (!strncmp(string, "extResponse ", 12))
2070                 {
2071                         ++cl_net_extresponse_count;
2072                         if(cl_net_extresponse_count > NET_EXTRESPONSE_MAX)
2073                                 cl_net_extresponse_count = NET_EXTRESPONSE_MAX;
2074                         cl_net_extresponse_last = (cl_net_extresponse_last + 1) % NET_EXTRESPONSE_MAX;
2075                         dpsnprintf(cl_net_extresponse[cl_net_extresponse_last], sizeof(cl_net_extresponse[cl_net_extresponse_last]), "\"%s\" %s", addressstring2, string + 12);
2076                         return true;
2077                 }
2078                 if (!strncmp(string, "ping", 4))
2079                 {
2080                         if (developer_extra.integer)
2081                                 Con_DPrintf("Received ping from %s, sending ack\n", addressstring2);
2082                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
2083                         return true;
2084                 }
2085                 if (!strncmp(string, "ack", 3))
2086                         return true;
2087                 // QuakeWorld compatibility
2088                 if (length > 1 && string[0] == 'c' && (string[1] == '-' || (string[1] >= '0' && string[1] <= '9')) && cls.connect_trying)
2089                 {
2090                         // challenge message
2091                         Con_Printf("challenge %s received, sending QuakeWorld connect request back to %s\n", string + 1, addressstring2);
2092 #ifdef CONFIG_MENU
2093                         M_Update_Return_Reason("Got QuakeWorld challenge response");
2094 #endif
2095                         cls.qw_qport = qport.integer;
2096                         // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
2097                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
2098                         NetConn_WriteString(mysocket, va(vabuf, sizeof(vabuf), "\377\377\377\377connect %i %i %i \"%s%s\"\n", 28, cls.qw_qport, atoi(string + 1), cls.userinfo, cls.connect_userinfo), peeraddress);
2099                         return true;
2100                 }
2101                 if (length >= 1 && string[0] == 'j' && cls.connect_trying)
2102                 {
2103                         // accept message
2104 #ifdef CONFIG_MENU
2105                         M_Update_Return_Reason("QuakeWorld Accepted");
2106 #endif
2107                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_QUAKEWORLD);
2108                         return true;
2109                 }
2110                 if (length > 2 && !memcmp(string, "n\\", 2))
2111                 {
2112 #ifdef CONFIG_MENU
2113                         serverlist_info_t *info;
2114                         int n;
2115
2116                         // qw server status
2117                         if (serverlist_consoleoutput && developer_networking.integer >= 2)
2118                                 Con_Printf("QW server status from server at %s:\n%s\n", addressstring2, string + 1);
2119
2120                         string += 1;
2121                         // search the cache for this server and update it
2122                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
2123                         if (n < 0)
2124                                 return true;
2125
2126                         info = &serverlist_cache[n].info;
2127                         strlcpy(info->game, "QuakeWorld", sizeof(info->game));
2128                         if ((s = InfoString_GetValue(string, "*gamedir"     , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
2129                         if ((s = InfoString_GetValue(string, "map"          , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
2130                         if ((s = InfoString_GetValue(string, "hostname"     , infostringvalue, sizeof(infostringvalue))) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
2131                         info->protocol = 0;
2132                         info->numplayers = 0; // updated below
2133                         info->numhumans = 0; // updated below
2134                         if ((s = InfoString_GetValue(string, "maxclients"   , infostringvalue, sizeof(infostringvalue))) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
2135                         if ((s = InfoString_GetValue(string, "gameversion"  , infostringvalue, sizeof(infostringvalue))) != NULL) info->gameversion = atoi(s);else info->gameversion = 0;
2136
2137                         // count active players on server
2138                         // (we could gather more info, but we're just after the number)
2139                         s = strchr(string, '\n');
2140                         if (s)
2141                         {
2142                                 s++;
2143                                 while (s < string + length)
2144                                 {
2145                                         for (;s < string + length && *s != '\n';s++)
2146                                                 ;
2147                                         if (s >= string + length)
2148                                                 break;
2149                                         info->numplayers++;
2150                                         info->numhumans++;
2151                                         s++;
2152                                 }
2153                         }
2154
2155                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
2156 #endif
2157                         return true;
2158                 }
2159                 if (string[0] == 'n')
2160                 {
2161                         // qw print command
2162                         Con_Printf("QW print command from server at %s:\n%s\n", addressstring2, string + 1);
2163                 }
2164                 // we may not have liked the packet, but it was a command packet, so
2165                 // we're done processing this packet now
2166                 return true;
2167         }
2168         // quakeworld ingame packet
2169         if (fromserver && cls.protocol == PROTOCOL_QUAKEWORLD && length >= 8 && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol, net_messagetimeout.value)) == 2)
2170         {
2171                 ret = 0;
2172                 CL_ParseServerMessage();
2173                 return ret;
2174         }
2175         // netquake control packets, supported for compatibility only
2176         if (length >= 5 && BuffBigLong(data) == ((int)NETFLAG_CTL | length) && !ENCRYPTION_REQUIRED)
2177         {
2178 #ifdef CONFIG_MENU
2179                 int n;
2180                 serverlist_info_t *info;
2181 #endif
2182
2183                 data += 4;
2184                 length -= 4;
2185                 SZ_Clear(&cl_message);
2186                 SZ_Write(&cl_message, data, length);
2187                 MSG_BeginReading(&cl_message);
2188                 c = MSG_ReadByte(&cl_message);
2189                 switch (c)
2190                 {
2191                 case CCREP_ACCEPT:
2192                         if (developer_extra.integer)
2193                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
2194                         if (cls.connect_trying)
2195                         {
2196                                 lhnetaddress_t clientportaddress;
2197                                 clientportaddress = *peeraddress;
2198                                 LHNETADDRESS_SetPort(&clientportaddress, MSG_ReadLong(&cl_message));
2199                                 // extra ProQuake stuff
2200                                 if (length >= 6)
2201                                         cls.proquake_servermod = MSG_ReadByte(&cl_message); // MOD_PROQUAKE
2202                                 else
2203                                         cls.proquake_servermod = 0;
2204                                 if (length >= 7)
2205                                         cls.proquake_serverversion = MSG_ReadByte(&cl_message); // version * 10
2206                                 else
2207                                         cls.proquake_serverversion = 0;
2208                                 if (length >= 8)
2209                                         cls.proquake_serverflags = MSG_ReadByte(&cl_message); // flags (mainly PQF_CHEATFREE)
2210                                 else
2211                                         cls.proquake_serverflags = 0;
2212                                 if (cls.proquake_servermod == 1)
2213                                         Con_Printf("Connected to ProQuake %.1f server, enabling precise aim\n", cls.proquake_serverversion / 10.0f);
2214                                 // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
2215                                 InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
2216 #ifdef CONFIG_MENU
2217                                 M_Update_Return_Reason("Accepted");
2218 #endif
2219                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress, PROTOCOL_QUAKE);
2220                         }
2221                         break;
2222                 case CCREP_REJECT:
2223                         if (developer_extra.integer)
2224                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
2225                         cls.connect_trying = false;
2226 #ifdef CONFIG_MENU
2227                         M_Update_Return_Reason((char *)MSG_ReadString(&cl_message, cl_readstring, sizeof(cl_readstring)));
2228 #endif
2229                         break;
2230                 case CCREP_SERVER_INFO:
2231                         if (developer_extra.integer)
2232                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
2233 #ifdef CONFIG_MENU
2234                         // LordHavoc: because the quake server may report weird addresses
2235                         // we just ignore it and keep the real address
2236                         MSG_ReadString(&cl_message, cl_readstring, sizeof(cl_readstring));
2237                         // search the cache for this server and update it
2238                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
2239                         if (n < 0)
2240                                 break;
2241
2242                         info = &serverlist_cache[n].info;
2243                         strlcpy(info->game, "Quake", sizeof(info->game));
2244                         strlcpy(info->mod , "", sizeof(info->mod)); // mod name is not specified
2245                         strlcpy(info->name, MSG_ReadString(&cl_message, cl_readstring, sizeof(cl_readstring)), sizeof(info->name));
2246                         strlcpy(info->map , MSG_ReadString(&cl_message, cl_readstring, sizeof(cl_readstring)), sizeof(info->map));
2247                         info->numplayers = MSG_ReadByte(&cl_message);
2248                         info->maxplayers = MSG_ReadByte(&cl_message);
2249                         info->protocol = MSG_ReadByte(&cl_message);
2250
2251                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
2252 #endif
2253                         break;
2254                 case CCREP_RCON: // RocketGuy: ProQuake rcon support
2255                         if (developer_extra.integer)
2256                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREP_RCON from %s.\n", addressstring2);
2257
2258                         Con_Printf("%s\n", MSG_ReadString(&cl_message, cl_readstring, sizeof(cl_readstring)));
2259                         break;
2260                 case CCREP_PLAYER_INFO:
2261                         // we got a CCREP_PLAYER_INFO??
2262                         //if (developer_extra.integer)
2263                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
2264                         break;
2265                 case CCREP_RULE_INFO:
2266                         // we got a CCREP_RULE_INFO??
2267                         //if (developer_extra.integer)
2268                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
2269                         break;
2270                 default:
2271                         break;
2272                 }
2273                 SZ_Clear(&cl_message);
2274                 // we may not have liked the packet, but it was a valid control
2275                 // packet, so we're done processing this packet now
2276                 return true;
2277         }
2278         ret = 0;
2279         if (fromserver && length >= (int)NET_HEADERSIZE && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol, net_messagetimeout.value)) == 2)
2280                 CL_ParseServerMessage();
2281         return ret;
2282 }
2283
2284 #ifdef CONFIG_MENU
2285 void NetConn_QueryQueueFrame(void)
2286 {
2287         int index;
2288         int queries;
2289         int maxqueries;
2290         double timeouttime;
2291         static double querycounter = 0;
2292
2293         if(!net_slist_pause.integer && serverlist_paused)
2294                 ServerList_RebuildViewList();
2295         serverlist_paused = net_slist_pause.integer != 0;
2296
2297         if (serverlist_querysleep)
2298                 return;
2299
2300         // apply a cool down time after master server replies,
2301         // to avoid messing up the ping times on the servers
2302         if (serverlist_querywaittime > realtime)
2303                 return;
2304
2305         // each time querycounter reaches 1.0 issue a query
2306         querycounter += cl.realframetime * net_slist_queriespersecond.value;
2307         maxqueries = (int)querycounter;
2308         maxqueries = bound(0, maxqueries, net_slist_queriesperframe.integer);
2309         querycounter -= maxqueries;
2310
2311         if( maxqueries == 0 ) {
2312                 return;
2313         }
2314
2315         //      scan serverlist and issue queries as needed
2316         serverlist_querysleep = true;
2317
2318         timeouttime     = realtime - net_slist_timeout.value;
2319         for( index = 0, queries = 0 ;   index   < serverlist_cachecount &&      queries < maxqueries    ; index++ )
2320         {
2321                 serverlist_entry_t *entry = &serverlist_cache[ index ];
2322                 if( entry->query != SQS_QUERYING && entry->query != SQS_REFRESHING )
2323                 {
2324                         continue;
2325                 }
2326
2327                 serverlist_querysleep   = false;
2328                 if( entry->querycounter !=      0 && entry->querytime > timeouttime     )
2329                 {
2330                         continue;
2331                 }
2332
2333                 if( entry->querycounter !=      (unsigned) net_slist_maxtries.integer )
2334                 {
2335                         lhnetaddress_t  address;
2336                         int socket;
2337
2338                         LHNETADDRESS_FromString(&address, entry->info.cname, 0);
2339                         if      (entry->protocol == PROTOCOL_QUAKEWORLD)
2340                         {
2341                                 for (socket     = 0; socket     < cl_numsockets ;       socket++)
2342                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377status\n", &address);
2343                         }
2344                         else
2345                         {
2346                                 for (socket     = 0; socket     < cl_numsockets ;       socket++)
2347                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377getstatus", &address);
2348                         }
2349
2350                         //      update the entry fields
2351                         entry->querytime = realtime;
2352                         entry->querycounter++;
2353
2354                         // if not in the slist menu we should print the server to console
2355                         if (serverlist_consoleoutput)
2356                                 Con_Printf("querying %25s (%i. try)\n", entry->info.cname, entry->querycounter);
2357
2358                         queries++;
2359                 }
2360                 else
2361                 {
2362                         // have we tried to refresh this server?
2363                         if( entry->query == SQS_REFRESHING ) {
2364                                 // yes, so update the reply count (since its not responding anymore)
2365                                 serverreplycount--;
2366                                 if(!serverlist_paused)
2367                                         ServerList_ViewList_Remove(entry);
2368                         }
2369                         entry->query = SQS_TIMEDOUT;
2370                 }
2371         }
2372 }
2373 #endif
2374
2375 void NetConn_ClientFrame(void)
2376 {
2377         int i, length;
2378         lhnetaddress_t peeraddress;
2379         unsigned char readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
2380         NetConn_UpdateSockets();
2381         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
2382         {
2383 #ifdef CONFIG_MENU
2384                 if (cls.connect_remainingtries == 0)
2385                         M_Update_Return_Reason("Connect: Waiting 10 seconds for reply");
2386 #endif
2387                 cls.connect_nextsendtime = realtime + 1;
2388                 cls.connect_remainingtries--;
2389                 if (cls.connect_remainingtries <= -10)
2390                 {
2391                         cls.connect_trying = false;
2392 #ifdef CONFIG_MENU
2393                         M_Update_Return_Reason("Connect: Failed");
2394 #endif
2395                         return;
2396                 }
2397                 // try challenge first (newer DP server or QW)
2398                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
2399                 // then try netquake as a fallback (old server, or netquake)
2400                 SZ_Clear(&cl_message);
2401                 // save space for the header, filled in later
2402                 MSG_WriteLong(&cl_message, 0);
2403                 MSG_WriteByte(&cl_message, CCREQ_CONNECT);
2404                 MSG_WriteString(&cl_message, "QUAKE");
2405                 MSG_WriteByte(&cl_message, NET_PROTOCOL_VERSION);
2406                 // extended proquake stuff
2407                 MSG_WriteByte(&cl_message, 1); // mod = MOD_PROQUAKE
2408                 // this version matches ProQuake 3.40, the first version to support
2409                 // the NAT fix, and it only supports the NAT fix for ProQuake 3.40 or
2410                 // higher clients, so we pretend we are that version...
2411                 MSG_WriteByte(&cl_message, 34); // version * 10
2412                 MSG_WriteByte(&cl_message, 0); // flags
2413                 MSG_WriteLong(&cl_message, 0); // password
2414                 // write the packetsize now...
2415                 StoreBigLong(cl_message.data, NETFLAG_CTL | (cl_message.cursize & NETFLAG_LENGTH_MASK));
2416                 NetConn_Write(cls.connect_mysocket, cl_message.data, cl_message.cursize, &cls.connect_address);
2417                 SZ_Clear(&cl_message);
2418         }
2419         for (i = 0;i < cl_numsockets;i++)
2420         {
2421                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
2422                 {
2423 //                      R_TimeReport("clientreadnetwork");
2424                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
2425 //                      R_TimeReport("clientparsepacket");
2426                 }
2427         }
2428 #ifdef CONFIG_MENU
2429         NetConn_QueryQueueFrame();
2430 #endif
2431         if (cls.netcon && realtime > cls.netcon->timeout && !sv.active)
2432         {
2433                 Con_Print("Connection timed out\n");
2434                 CL_Disconnect();
2435                 SV_LockThreadMutex();
2436                 Host_ShutdownServer ();
2437                 SV_UnlockThreadMutex();
2438         }
2439 }
2440
2441 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
2442 {
2443         int i;
2444         char c;
2445         for (i = 0;i < bufferlength - 1;i++)
2446         {
2447                 do
2448                 {
2449                         c = rand () % (127 - 33) + 33;
2450                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
2451                 buffer[i] = c;
2452         }
2453         buffer[i] = 0;
2454 }
2455
2456 /// (div0) build the full response only if possible; better a getinfo response than no response at all if getstatus won't fit
2457 static qboolean NetConn_BuildStatusResponse(const char* challenge, char* out_msg, size_t out_size, qboolean fullstatus)
2458 {
2459         prvm_prog_t *prog = SVVM_prog;
2460         char qcstatus[256];
2461         unsigned int nb_clients = 0, nb_bots = 0, i;
2462         int length;
2463         char teambuf[3];
2464         const char *crypto_idstring;
2465         const char *str;
2466
2467         // How many clients are there?
2468         for (i = 0;i < (unsigned int)svs.maxclients;i++)
2469         {
2470                 if (svs.clients[i].active)
2471                 {
2472                         nb_clients++;
2473                         if (!svs.clients[i].netconnection)
2474                                 nb_bots++;
2475                 }
2476         }
2477
2478         *qcstatus = 0;
2479         str = PRVM_GetString(prog, PRVM_serverglobalstring(worldstatus));
2480         if(str && *str)
2481         {
2482                 char *p;
2483                 const char *q;
2484                 p = qcstatus;
2485                 for(q = str; *q && (size_t)(p - qcstatus) < (sizeof(qcstatus) - 1); ++q)
2486                         if(*q != '\\' && *q != '\n')
2487                                 *p++ = *q;
2488                 *p = 0;
2489         }
2490
2491         /// \TODO: we should add more information for the full status string
2492         crypto_idstring = Crypto_GetInfoResponseDataString();
2493         length = dpsnprintf(out_msg, out_size,
2494                                                 "\377\377\377\377%s\x0A"
2495                                                 "\\gamename\\%s\\modname\\%s\\gameversion\\%d\\sv_maxclients\\%d"
2496                                                 "\\clients\\%d\\bots\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d"
2497                                                 "%s%s"
2498                                                 "%s%s"
2499                                                 "%s%s"
2500                                                 "%s",
2501                                                 fullstatus ? "statusResponse" : "infoResponse",
2502                                                 gamenetworkfiltername, com_modname, gameversion.integer, svs.maxclients,
2503                                                 nb_clients, nb_bots, sv.worldbasename, hostname.string, NET_PROTOCOL_VERSION,
2504                                                 *qcstatus ? "\\qcstatus\\" : "", qcstatus,
2505                                                 challenge ? "\\challenge\\" : "", challenge ? challenge : "",
2506                                                 crypto_idstring ? "\\d0_blind_id\\" : "", crypto_idstring ? crypto_idstring : "",
2507                                                 fullstatus ? "\n" : "");
2508
2509         // Make sure it fits in the buffer
2510         if (length < 0)
2511                 goto bad;
2512
2513         if (fullstatus)
2514         {
2515                 char *ptr;
2516                 int left;
2517                 int savelength;
2518
2519                 savelength = length;
2520
2521                 ptr = out_msg + length;
2522                 left = (int)out_size - length;
2523
2524                 for (i = 0;i < (unsigned int)svs.maxclients;i++)
2525                 {
2526                         client_t *cl = &svs.clients[i];
2527                         if (cl->active)
2528                         {
2529                                 int nameind, cleanind, pingvalue;
2530                                 char curchar;
2531                                 char cleanname [sizeof(cl->name)];
2532                                 const char *str;
2533                                 prvm_edict_t *ed;
2534
2535                                 // Remove all characters '"' and '\' in the player name
2536                                 nameind = 0;
2537                                 cleanind = 0;
2538                                 do
2539                                 {
2540                                         curchar = cl->name[nameind++];
2541                                         if (curchar != '"' && curchar != '\\')
2542                                         {
2543                                                 cleanname[cleanind++] = curchar;
2544                                                 if (cleanind == sizeof(cleanname) - 1)
2545                                                         break;
2546                                         }
2547                                 } while (curchar != '\0');
2548                                 cleanname[cleanind] = 0; // cleanind is always a valid index even at this point
2549
2550                                 pingvalue = (int)(cl->ping * 1000.0f);
2551                                 if(cl->netconnection)
2552                                         pingvalue = bound(1, pingvalue, 9999);
2553                                 else
2554                                         pingvalue = 0;
2555
2556                                 *qcstatus = 0;
2557                                 ed = PRVM_EDICT_NUM(i + 1);
2558                                 str = PRVM_GetString(prog, PRVM_serveredictstring(ed, clientstatus));
2559                                 if(str && *str)
2560                                 {
2561                                         char *p;
2562                                         const char *q;
2563                                         p = qcstatus;
2564                                         for(q = str; *q && p != qcstatus + sizeof(qcstatus) - 1; ++q)
2565                                                 if(*q != '\\' && *q != '"' && !ISWHITESPACE(*q))
2566                                                         *p++ = *q;
2567                                         *p = 0;
2568                                 }
2569
2570                                 if (IS_NEXUIZ_DERIVED(gamemode) && (teamplay.integer > 0))
2571                                 {
2572                                         if(cl->frags == -666) // spectator
2573                                                 strlcpy(teambuf, " 0", sizeof(teambuf));
2574                                         else if(cl->colors == 0x44) // red team
2575                                                 strlcpy(teambuf, " 1", sizeof(teambuf));
2576                                         else if(cl->colors == 0xDD) // blue team
2577                                                 strlcpy(teambuf, " 2", sizeof(teambuf));
2578                                         else if(cl->colors == 0xCC) // yellow team
2579                                                 strlcpy(teambuf, " 3", sizeof(teambuf));
2580                                         else if(cl->colors == 0x99) // pink team
2581                                                 strlcpy(teambuf, " 4", sizeof(teambuf));
2582                                         else
2583                                                 strlcpy(teambuf, " 0", sizeof(teambuf));
2584                                 }
2585                                 else
2586                                         *teambuf = 0;
2587
2588                                 // note: team number is inserted according to SoF2 protocol
2589                                 if(*qcstatus)
2590                                         length = dpsnprintf(ptr, left, "%s %d%s \"%s\"\n",
2591                                                                                 qcstatus,
2592                                                                                 pingvalue,
2593                                                                                 teambuf,
2594                                                                                 cleanname);
2595                                 else
2596                                         length = dpsnprintf(ptr, left, "%d %d%s \"%s\"\n",
2597                                                                                 cl->frags,
2598                                                                                 pingvalue,
2599                                                                                 teambuf,
2600                                                                                 cleanname);
2601
2602                                 if(length < 0)
2603                                 {
2604                                         // out of space?
2605                                         // turn it into an infoResponse!
2606                                         out_msg[savelength] = 0;
2607                                         memcpy(out_msg + 4, "infoResponse\x0A", 13);
2608                                         memmove(out_msg + 17, out_msg + 19, savelength - 19);
2609                                         break;
2610                                 }
2611                                 left -= length;
2612                                 ptr += length;
2613                         }
2614                 }
2615         }
2616
2617         return true;
2618
2619 bad:
2620         return false;
2621 }
2622
2623 static qboolean NetConn_PreventFlood(lhnetaddress_t *peeraddress, server_floodaddress_t *floodlist, size_t floodlength, double floodtime, qboolean renew)
2624 {
2625         size_t floodslotnum, bestfloodslotnum;
2626         double bestfloodtime;
2627         lhnetaddress_t noportpeeraddress;
2628         // see if this is a connect flood
2629         noportpeeraddress = *peeraddress;
2630         LHNETADDRESS_SetPort(&noportpeeraddress, 0);
2631         bestfloodslotnum = 0;
2632         bestfloodtime = floodlist[bestfloodslotnum].lasttime;
2633         for (floodslotnum = 0;floodslotnum < floodlength;floodslotnum++)
2634         {
2635                 if (bestfloodtime >= floodlist[floodslotnum].lasttime)
2636                 {
2637                         bestfloodtime = floodlist[floodslotnum].lasttime;
2638                         bestfloodslotnum = floodslotnum;
2639                 }
2640                 if (floodlist[floodslotnum].lasttime && LHNETADDRESS_Compare(&noportpeeraddress, &floodlist[floodslotnum].address) == 0)
2641                 {
2642                         // this address matches an ongoing flood address
2643                         if (realtime < floodlist[floodslotnum].lasttime + floodtime)
2644                         {
2645                                 if(renew)
2646                                 {
2647                                         // renew the ban on this address so it does not expire
2648                                         // until the flood has subsided
2649                                         floodlist[floodslotnum].lasttime = realtime;
2650                                 }
2651                                 //Con_Printf("Flood detected!\n");
2652                                 return true;
2653                         }
2654                         // the flood appears to have subsided, so allow this
2655                         bestfloodslotnum = floodslotnum; // reuse the same slot
2656                         break;
2657                 }
2658         }
2659         // begin a new timeout on this address
2660         floodlist[bestfloodslotnum].address = noportpeeraddress;
2661         floodlist[bestfloodslotnum].lasttime = realtime;
2662         //Con_Printf("Flood detection initiated!\n");
2663         return false;
2664 }
2665
2666 void NetConn_ClearFlood(lhnetaddress_t *peeraddress, server_floodaddress_t *floodlist, size_t floodlength)
2667 {
2668         size_t floodslotnum;
2669         lhnetaddress_t noportpeeraddress;
2670         // see if this is a connect flood
2671         noportpeeraddress = *peeraddress;
2672         LHNETADDRESS_SetPort(&noportpeeraddress, 0);
2673         for (floodslotnum = 0;floodslotnum < floodlength;floodslotnum++)
2674         {
2675                 if (floodlist[floodslotnum].lasttime && LHNETADDRESS_Compare(&noportpeeraddress, &floodlist[floodslotnum].address) == 0)
2676                 {
2677                         // this address matches an ongoing flood address
2678                         // remove the ban
2679                         floodlist[floodslotnum].address.addresstype = LHNETADDRESSTYPE_NONE;
2680                         floodlist[floodslotnum].lasttime = 0;
2681                         //Con_Printf("Flood cleared!\n");
2682                 }
2683         }
2684 }
2685
2686 typedef qboolean (*rcon_matchfunc_t) (lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen);
2687
2688 static qboolean hmac_mdfour_time_matching(lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen)
2689 {
2690         char mdfourbuf[16];
2691         long t1, t2;
2692
2693         t1 = (long) time(NULL);
2694         t2 = strtol(s, NULL, 0);
2695         if(abs(t1 - t2) > rcon_secure_maxdiff.integer)
2696                 return false;
2697
2698         if(!HMAC_MDFOUR_16BYTES((unsigned char *) mdfourbuf, (unsigned char *) s, slen, (unsigned char *) password, strlen(password)))
2699                 return false;
2700
2701         return !memcmp(mdfourbuf, hash, 16);
2702 }
2703
2704 static qboolean hmac_mdfour_challenge_matching(lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen)
2705 {
2706         char mdfourbuf[16];
2707         int i;
2708
2709         if(slen < (int)(sizeof(challenge[0].string)) - 1)
2710                 return false;
2711
2712         // validate the challenge
2713         for (i = 0;i < MAX_CHALLENGES;i++)
2714                 if(challenge[i].time > 0)
2715                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strncmp(challenge[i].string, s, sizeof(challenge[0].string) - 1))
2716                                 break;
2717         // if the challenge is not recognized, drop the packet
2718         if (i == MAX_CHALLENGES)
2719                 return false;
2720
2721         if(!HMAC_MDFOUR_16BYTES((unsigned char *) mdfourbuf, (unsigned char *) s, slen, (unsigned char *) password, strlen(password)))
2722                 return false;
2723
2724         if(memcmp(mdfourbuf, hash, 16))
2725                 return false;
2726
2727         // unmark challenge to prevent replay attacks
2728         challenge[i].time = 0;
2729
2730         return true;
2731 }
2732
2733 static qboolean plaintext_matching(lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen)
2734 {
2735         return !strcmp(password, hash);
2736 }
2737
2738 /// returns a string describing the user level, or NULL for auth failure
2739 static const char *RCon_Authenticate(lhnetaddress_t *peeraddress, const char *password, const char *s, const char *endpos, rcon_matchfunc_t comparator, const char *cs, int cslen)
2740 {
2741         const char *text, *userpass_start, *userpass_end, *userpass_startpass;
2742         static char buf[MAX_INPUTLINE];
2743         qboolean hasquotes;
2744         qboolean restricted = false;
2745         qboolean have_usernames = false;
2746         char vabuf[1024];
2747
2748         userpass_start = rcon_password.string;
2749         while((userpass_end = strchr(userpass_start, ' ')))
2750         {
2751                 have_usernames = true;
2752                 strlcpy(buf, userpass_start, ((size_t)(userpass_end-userpass_start) >= sizeof(buf)) ? (int)(sizeof(buf)) : (int)(userpass_end-userpass_start+1));
2753                 if(buf[0])
2754                         if(comparator(peeraddress, buf, password, cs, cslen))
2755                                 goto allow;
2756                 userpass_start = userpass_end + 1;
2757         }
2758         if(userpass_start[0])
2759         {
2760                 userpass_end = userpass_start + strlen(userpass_start);
2761                 if(comparator(peeraddress, userpass_start, password, cs, cslen))
2762                         goto allow;
2763         }
2764
2765         restricted = true;
2766         have_usernames = false;
2767         userpass_start = rcon_restricted_password.string;
2768         while((userpass_end = strchr(userpass_start, ' ')))
2769         {
2770                 have_usernames = true;
2771                 strlcpy(buf, userpass_start, ((size_t)(userpass_end-userpass_start) >= sizeof(buf)) ? (int)(sizeof(buf)) : (int)(userpass_end-userpass_start+1));
2772                 if(buf[0])
2773                         if(comparator(peeraddress, buf, password, cs, cslen))
2774                                 goto check;
2775                 userpass_start = userpass_end + 1;
2776         }
2777         if(userpass_start[0])
2778         {
2779                 userpass_end = userpass_start + strlen(userpass_start);
2780                 if(comparator(peeraddress, userpass_start, password, cs, cslen))
2781                         goto check;
2782         }
2783
2784         return NULL; // DENIED
2785
2786 check:
2787         for(text = s; text != endpos; ++text)
2788                 if((signed char) *text > 0 && ((signed char) *text < (signed char) ' ' || *text == ';'))
2789                         return NULL; // block possible exploits against the parser/alias expansion
2790
2791         while(s != endpos)
2792         {
2793                 size_t l = strlen(s);
2794                 if(l)
2795                 {
2796                         hasquotes = (strchr(s, '"') != NULL);
2797                         // sorry, we can't allow these substrings in wildcard expressions,
2798                         // as they can mess with the argument counts
2799                         text = rcon_restricted_commands.string;
2800                         while(COM_ParseToken_Console(&text))
2801                         {
2802                                 // com_token now contains a pattern to check for...
2803                                 if(strchr(com_token, '*') || strchr(com_token, '?')) // wildcard expression, * can only match a SINGLE argument
2804                                 {
2805                                         if(!hasquotes)
2806                                                 if(matchpattern_with_separator(s, com_token, true, " ", true)) // note how we excluded tab, newline etc. above
2807                                                         goto match;
2808                                 }
2809                                 else if(strchr(com_token, ' ')) // multi-arg expression? must match in whole
2810                                 {
2811                                         if(!strcmp(com_token, s))
2812                                                 goto match;
2813                                 }
2814                                 else // single-arg expression? must match the beginning of the command
2815                                 {
2816                                         if(!strcmp(com_token, s))
2817                                                 goto match;
2818                                         if(!memcmp(va(vabuf, sizeof(vabuf), "%s ", com_token), s, strlen(com_token) + 1))
2819                                                 goto match;
2820                                 }
2821                         }
2822                         // if we got here, nothing matched!
2823                         return NULL;
2824                 }
2825 match:
2826                 s += l + 1;
2827         }
2828
2829 allow:
2830         userpass_startpass = strchr(userpass_start, ':');
2831         if(have_usernames && userpass_startpass && userpass_startpass < userpass_end)
2832                 return va(vabuf, sizeof(vabuf), "%srcon (username %.*s)", restricted ? "restricted " : "", (int)(userpass_startpass-userpass_start), userpass_start);
2833
2834         return va(vabuf, sizeof(vabuf), "%srcon", restricted ? "restricted " : "");
2835 }
2836
2837 static void RCon_Execute(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress, const char *addressstring2, const char *userlevel, const char *s, const char *endpos, qboolean proquakeprotocol)
2838 {
2839         if(userlevel)
2840         {
2841                 // looks like a legitimate rcon command with the correct password
2842                 const char *s_ptr = s;
2843                 Con_Printf("server received %s command from %s: ", userlevel, host_client ? host_client->name : addressstring2);
2844                 while(s_ptr != endpos)
2845                 {
2846                         size_t l = strlen(s_ptr);
2847                         if(l)
2848                                 Con_Printf(" %s;", s_ptr);
2849                         s_ptr += l + 1;
2850                 }
2851                 Con_Printf("\n");
2852
2853                 if (!host_client || !host_client->netconnection || LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
2854                         Con_Rcon_Redirect_Init(mysocket, peeraddress, proquakeprotocol);
2855                 while(s != endpos)
2856                 {
2857                         size_t l = strlen(s);
2858                         if(l)
2859                         {
2860                                 client_t *host_client_save = host_client;
2861                                 Cmd_ExecuteString(s, src_command, true);
2862                                 host_client = host_client_save;
2863                                 // in case it is a command that changes host_client (like restart)
2864                         }
2865                         s += l + 1;
2866                 }
2867                 Con_Rcon_Redirect_End();
2868         }
2869         else
2870         {
2871                 Con_Printf("server denied rcon access to %s\n", host_client ? host_client->name : addressstring2);
2872         }
2873 }
2874
2875 static int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
2876 {
2877         int i, ret, clientnum, best;
2878         double besttime;
2879         client_t *client;
2880         char *s, *string, response[1400], addressstring2[128];
2881         static char stringbuf[16384]; // server only
2882         qboolean islocal = (LHNETADDRESS_GetAddressType(peeraddress) == LHNETADDRESSTYPE_LOOP);
2883         char senddata[NET_HEADERSIZE+NET_MAXMESSAGE+CRYPTO_HEADERSIZE];
2884         size_t sendlength, response_len;
2885         char infostringvalue[MAX_INPUTLINE];
2886         char vabuf[1024];
2887
2888         if (!sv.active)
2889                 return false;
2890
2891         // convert the address to a string incase we need it
2892         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
2893
2894         // see if we can identify the sender as a local player
2895         // (this is necessary for rcon to send a reliable reply if the client is
2896         //  actually on the server, not sending remotely)
2897         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
2898                 if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
2899                         break;
2900         if (i == svs.maxclients)
2901                 host_client = NULL;
2902
2903         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
2904         {
2905                 // received a command string - strip off the packaging and put it
2906                 // into our string buffer with NULL termination
2907                 data += 4;
2908                 length -= 4;
2909                 length = min(length, (int)sizeof(stringbuf) - 1);
2910                 memcpy(stringbuf, data, length);
2911                 stringbuf[length] = 0;
2912                 string = stringbuf;
2913
2914                 if (developer_extra.integer)
2915                 {
2916                         Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
2917                         Com_HexDumpToConsole(data, length);
2918                 }
2919
2920                 sendlength = sizeof(senddata) - 4;
2921                 switch(Crypto_ServerParsePacket(string, length, senddata+4, &sendlength, peeraddress))
2922                 {
2923                         case CRYPTO_NOMATCH:
2924                                 // nothing to do
2925                                 break;
2926                         case CRYPTO_MATCH:
2927                                 if(sendlength)
2928                                 {
2929                                         memcpy(senddata, "\377\377\377\377", 4);
2930                                         NetConn_Write(mysocket, senddata, sendlength+4, peeraddress);
2931                                 }
2932                                 break;
2933                         case CRYPTO_DISCARD:
2934                                 if(sendlength)
2935                                 {
2936                                         memcpy(senddata, "\377\377\377\377", 4);
2937                                         NetConn_Write(mysocket, senddata, sendlength+4, peeraddress);
2938                                 }
2939                                 return true;
2940                                 break;
2941                         case CRYPTO_REPLACE:
2942                                 string = senddata+4;
2943                                 length = sendlength;
2944                                 break;
2945                 }
2946
2947                 if (length >= 12 && !memcmp(string, "getchallenge", 12) && (islocal || sv_public.integer > -3))
2948                 {
2949                         for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
2950                         {
2951                                 if(challenge[i].time > 0)
2952                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
2953                                                 break;
2954                                 if (besttime > challenge[i].time)
2955                                         besttime = challenge[best = i].time;
2956                         }
2957                         // if we did not find an exact match, choose the oldest and
2958                         // update address and string
2959                         if (i == MAX_CHALLENGES)
2960                         {
2961                                 i = best;
2962                                 challenge[i].address = *peeraddress;
2963                                 NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
2964                         }
2965                         else
2966                         {
2967                                 // flood control: drop if requesting challenge too often
2968                                 if(challenge[i].time > realtime - net_challengefloodblockingtimeout.value)
2969                                         return true;
2970                         }
2971                         challenge[i].time = realtime;
2972                         // send the challenge
2973                         dpsnprintf(response, sizeof(response), "\377\377\377\377challenge %s", challenge[i].string);
2974                         response_len = strlen(response) + 1;
2975                         Crypto_ServerAppendToChallenge(string, length, response, &response_len, sizeof(response));
2976                         NetConn_Write(mysocket, response, response_len, peeraddress);
2977                         return true;
2978                 }
2979                 if (length > 8 && !memcmp(string, "connect\\", 8))
2980                 {
2981                         crypto_t *crypto = Crypto_ServerGetInstance(peeraddress);
2982                         string += 7;
2983                         length -= 7;
2984
2985                         if(crypto && crypto->authenticated)
2986                         {
2987                                 // no need to check challenge
2988                                 if(crypto_developer.integer)
2989                                 {
2990                                         Con_Printf("%s connection to %s is being established: client is %s@%.*s, I am %.*s@%.*s\n",
2991                                                         crypto->use_aes ? "Encrypted" : "Authenticated",
2992                                                         addressstring2,
2993                                                         crypto->client_idfp[0] ? crypto->client_idfp : "-",
2994                                                         crypto_keyfp_recommended_length, crypto->client_keyfp[0] ? crypto->client_keyfp : "-",
2995                                                         crypto_keyfp_recommended_length, crypto->server_idfp[0] ? crypto->server_idfp : "-",
2996                                                         crypto_keyfp_recommended_length, crypto->server_keyfp[0] ? crypto->server_keyfp : "-"
2997                                                   );
2998                                 }
2999                         }
3000                         else
3001                         {
3002                                 if ((s = InfoString_GetValue(string, "challenge", infostringvalue, sizeof(infostringvalue))))
3003                                 {
3004                                         // validate the challenge
3005                                         for (i = 0;i < MAX_CHALLENGES;i++)
3006                                                 if(challenge[i].time > 0)
3007                                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
3008                                                                 break;
3009                                         // if the challenge is not recognized, drop the packet
3010                                         if (i == MAX_CHALLENGES)
3011                                                 return true;
3012                                 }
3013                         }
3014
3015                         if((s = InfoString_GetValue(string, "message", infostringvalue, sizeof(infostringvalue))))
3016                                 Con_DPrintf("Connecting client %s sent us the message: %s\n", addressstring2, s);
3017
3018                         if(!(islocal || sv_public.integer > -2))
3019                         {
3020                                 if (developer_extra.integer)
3021                                         Con_Printf("Datagram_ParseConnectionless: sending \"reject %s\" to %s.\n", sv_public_rejectreason.string, addressstring2);
3022                                 NetConn_WriteString(mysocket, va(vabuf, sizeof(vabuf), "\377\377\377\377reject %s", sv_public_rejectreason.string), peeraddress);
3023                                 return true;
3024                         }
3025
3026                         // check engine protocol
3027                         if(!(s = InfoString_GetValue(string, "protocol", infostringvalue, sizeof(infostringvalue))) || strcmp(s, "darkplaces 3"))
3028                         {
3029                                 if (developer_extra.integer)
3030                                         Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
3031                                 NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
3032                                 return true;
3033                         }
3034
3035                         // see if this is a duplicate connection request or a disconnected
3036                         // client who is rejoining to the same client slot
3037                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
3038                         {
3039                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
3040                                 {
3041                                         // this is a known client...
3042                                         if(crypto && crypto->authenticated)
3043                                         {
3044                                                 // reject if changing key!
3045                                                 if(client->netconnection->crypto.authenticated)
3046                                                 {
3047                                                         if(
3048                                                                         strcmp(client->netconnection->crypto.client_idfp, crypto->client_idfp)
3049                                                                         ||
3050                                                                         strcmp(client->netconnection->crypto.server_idfp, crypto->server_idfp)
3051                                                                         ||
3052                                                                         strcmp(client->netconnection->crypto.client_keyfp, crypto->client_keyfp)
3053                                                                         ||
3054                                                                         strcmp(client->netconnection->crypto.server_keyfp, crypto->server_keyfp)
3055                                                           )
3056                                                         {
3057                                                                 if (developer_extra.integer)
3058                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"reject Attempt to change key of crypto.\" to %s.\n", addressstring2);
3059                                                                 NetConn_WriteString(mysocket, "\377\377\377\377reject Attempt to change key of crypto.", peeraddress);
3060                                                                 return true;
3061                                                         }
3062                                                 }
3063                                         }
3064                                         else
3065                                         {
3066                                                 // reject if downgrading!
3067                                                 if(client->netconnection->crypto.authenticated)
3068                                                 {
3069                                                         if (developer_extra.integer)
3070                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Attempt to downgrade crypto.\" to %s.\n", addressstring2);
3071                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Attempt to downgrade crypto.", peeraddress);
3072                                                         return true;
3073                                                 }
3074                                         }
3075                                         if (client->begun)
3076                                         {
3077                                                 // client crashed and is coming back,
3078                                                 // keep their stuff intact
3079                                                 if (developer_extra.integer)
3080                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", addressstring2);
3081                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
3082                                                 if(crypto && crypto->authenticated)
3083                                                         Crypto_FinishInstance(&client->netconnection->crypto, crypto);
3084                                                 SV_SendServerinfo(client);
3085                                         }
3086                                         else
3087                                         {
3088                                                 // client is still trying to connect,
3089                                                 // so we send a duplicate reply
3090                                                 if (developer_extra.integer)
3091                                                         Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
3092                                                 if(crypto && crypto->authenticated)
3093                                                         Crypto_FinishInstance(&client->netconnection->crypto, crypto);
3094                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
3095                                         }
3096                                         return true;
3097                                 }
3098                         }
3099
3100                         if (NetConn_PreventFlood(peeraddress, sv.connectfloodaddresses, sizeof(sv.connectfloodaddresses) / sizeof(sv.connectfloodaddresses[0]), net_connectfloodblockingtimeout.value, true))
3101                                 return true;
3102
3103                         // find an empty client slot for this new client
3104                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
3105                         {
3106                                 netconn_t *conn;
3107                                 if (!client->active && (conn = NetConn_Open(mysocket, peeraddress)))
3108                                 {
3109                                         // allocated connection
3110                                         if (developer_extra.integer)
3111                                                 Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
3112                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
3113                                         // now set up the client
3114                                         if(crypto && crypto->authenticated)
3115                                                 Crypto_FinishInstance(&conn->crypto, crypto);
3116                                         SV_ConnectClient(clientnum, conn);
3117                                         NetConn_Heartbeat(1);
3118                                         return true;
3119                                 }
3120                         }
3121
3122                         // no empty slots found - server is full
3123                         if (developer_extra.integer)
3124                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
3125                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
3126
3127                         return true;
3128                 }
3129                 if (length >= 7 && !memcmp(string, "getinfo", 7) && (islocal || sv_public.integer > -1))
3130                 {
3131                         const char *challenge = NULL;
3132
3133                         if (NetConn_PreventFlood(peeraddress, sv.getstatusfloodaddresses, sizeof(sv.getstatusfloodaddresses) / sizeof(sv.getstatusfloodaddresses[0]), net_getstatusfloodblockingtimeout.value, false))
3134                                 return true;
3135
3136                         // If there was a challenge in the getinfo message
3137                         if (length > 8 && string[7] == ' ')
3138                                 challenge = string + 8;
3139
3140                         if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), false))
3141                         {
3142                                 if (developer_extra.integer)
3143                                         Con_DPrintf("Sending reply to master %s - %s\n", addressstring2, response);
3144                                 NetConn_WriteString(mysocket, response, peeraddress);
3145                         }
3146                         return true;
3147                 }
3148                 if (length >= 9 && !memcmp(string, "getstatus", 9) && (islocal || sv_public.integer > -1))
3149                 {
3150                         const char *challenge = NULL;
3151
3152                         if (NetConn_PreventFlood(peeraddress, sv.getstatusfloodaddresses, sizeof(sv.getstatusfloodaddresses) / sizeof(sv.getstatusfloodaddresses[0]), net_getstatusfloodblockingtimeout.value, false))
3153                                 return true;
3154
3155                         // If there was a challenge in the getinfo message
3156                         if (length > 10 && string[9] == ' ')
3157                                 challenge = string + 10;
3158
3159                         if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), true))
3160                         {
3161                                 if (developer_extra.integer)
3162                                         Con_DPrintf("Sending reply to client %s - %s\n", addressstring2, response);
3163                                 NetConn_WriteString(mysocket, response, peeraddress);
3164                         }
3165                         return true;
3166                 }
3167                 if (length >= 37 && !memcmp(string, "srcon HMAC-MD4 TIME ", 20))
3168                 {
3169                         char *password = string + 20;
3170                         char *timeval = string + 37;
3171                         char *s = strchr(timeval, ' ');
3172                         char *endpos = string + length + 1; // one behind the NUL, so adding strlen+1 will eventually reach it
3173                         const char *userlevel;
3174
3175                         if(rcon_secure.integer > 1)
3176                                 return true;
3177
3178                         if(!s)
3179                                 return true; // invalid packet
3180                         ++s;
3181
3182                         userlevel = RCon_Authenticate(peeraddress, password, s, endpos, hmac_mdfour_time_matching, timeval, endpos - timeval - 1); // not including the appended \0 into the HMAC
3183                         RCon_Execute(mysocket, peeraddress, addressstring2, userlevel, s, endpos, false);
3184                         return true;
3185                 }
3186                 if (length >= 42 && !memcmp(string, "srcon HMAC-MD4 CHALLENGE ", 25))
3187                 {
3188                         char *password = string + 25;
3189                         char *challenge = string + 42;
3190                         char *s = strchr(challenge, ' ');
3191                         char *endpos = string + length + 1; // one behind the NUL, so adding strlen+1 will eventually reach it
3192                         const char *userlevel;
3193                         if(!s)
3194                                 return true; // invalid packet
3195                         ++s;
3196
3197                         userlevel = RCon_Authenticate(peeraddress, password, s, endpos, hmac_mdfour_challenge_matching, challenge, endpos - challenge - 1); // not including the appended \0 into the HMAC
3198                         RCon_Execute(mysocket, peeraddress, addressstring2, userlevel, s, endpos, false);
3199                         return true;
3200                 }
3201                 if (length >= 5 && !memcmp(string, "rcon ", 5))
3202                 {
3203                         int i;
3204                         char *s = string + 5;
3205                         char *endpos = string + length + 1; // one behind the NUL, so adding strlen+1 will eventually reach it
3206                         char password[64];
3207
3208                         if(rcon_secure.integer > 0)
3209                                 return true;
3210
3211                         for (i = 0;!ISWHITESPACE(*s);s++)
3212                                 if (i < (int)sizeof(password) - 1)
3213                                         password[i++] = *s;
3214                         if(ISWHITESPACE(*s) && s != endpos) // skip leading ugly space
3215                                 ++s;
3216                         password[i] = 0;
3217                         if (!ISWHITESPACE(password[0]))
3218                         {
3219                                 const char *userlevel = RCon_Authenticate(peeraddress, password, s, endpos, plaintext_matching, NULL, 0);
3220                                 RCon_Execute(mysocket, peeraddress, addressstring2, userlevel, s, endpos, false);
3221                         }
3222                         return true;
3223                 }
3224                 if (!strncmp(string, "extResponse ", 12))
3225                 {
3226                         ++sv_net_extresponse_count;
3227                         if(sv_net_extresponse_count > NET_EXTRESPONSE_MAX)
3228                                 sv_net_extresponse_count = NET_EXTRESPONSE_MAX;
3229                         sv_net_extresponse_last = (sv_net_extresponse_last + 1) % NET_EXTRESPONSE_MAX;
3230                         dpsnprintf(sv_net_extresponse[sv_net_extresponse_last], sizeof(sv_net_extresponse[sv_net_extresponse_last]), "'%s' %s", addressstring2, string + 12);
3231                         return true;
3232                 }
3233                 if (!strncmp(string, "ping", 4))
3234                 {
3235                         if (developer_extra.integer)
3236                                 Con_DPrintf("Received ping from %s, sending ack\n", addressstring2);
3237                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
3238                         return true;
3239                 }
3240                 if (!strncmp(string, "ack", 3))
3241                         return true;
3242                 // we may not have liked the packet, but it was a command packet, so
3243                 // we're done processing this packet now
3244                 return true;
3245         }
3246         // netquake control packets, supported for compatibility only, and only
3247         // when running game protocols that are normally served via this connection
3248         // protocol
3249         // (this protects more modern protocols against being used for
3250         //  Quake packet flood Denial Of Service attacks)
3251         if (length >= 5 && (i = BuffBigLong(data)) && (i & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (i & NETFLAG_LENGTH_MASK) == length && (sv.protocol == PROTOCOL_QUAKE || sv.protocol == PROTOCOL_QUAKEDP || sv.protocol == PROTOCOL_NEHAHRAMOVIE || sv.protocol == PROTOCOL_NEHAHRABJP || sv.protocol == PROTOCOL_NEHAHRABJP2 || sv.protocol == PROTOCOL_NEHAHRABJP3 || sv.protocol == PROTOCOL_DARKPLACES1 || sv.protocol == PROTOCOL_DARKPLACES2 || sv.protocol == PROTOCOL_DARKPLACES3) && !ENCRYPTION_REQUIRED)
3252         {
3253                 int c;
3254                 int protocolnumber;
3255                 const char *protocolname;
3256                 data += 4;
3257                 length -= 4;
3258                 SZ_Clear(&sv_message);
3259                 SZ_Write(&sv_message, data, length);
3260                 MSG_BeginReading(&sv_message);
3261                 c = MSG_ReadByte(&sv_message);
3262                 switch (c)
3263                 {
3264                 case CCREQ_CONNECT:
3265                         if (developer_extra.integer)
3266                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
3267                         if(!(islocal || sv_public.integer > -2))
3268                         {
3269                                 if (developer_extra.integer)
3270                                         Con_DPrintf("Datagram_ParseConnectionless: sending CCREP_REJECT \"%s\" to %s.\n", sv_public_rejectreason.string, addressstring2);
3271                                 SZ_Clear(&sv_message);
3272                                 // save space for the header, filled in later
3273                                 MSG_WriteLong(&sv_message, 0);
3274                                 MSG_WriteByte(&sv_message, CCREP_REJECT);
3275                                 MSG_WriteString(&sv_message, va(vabuf, sizeof(vabuf), "%s\n", sv_public_rejectreason.string));
3276                                 StoreBigLong(sv_message.data, NETFLAG_CTL | (sv_message.cursize & NETFLAG_LENGTH_MASK));
3277                                 NetConn_Write(mysocket, sv_message.data, sv_message.cursize, peeraddress);
3278                                 SZ_Clear(&sv_message);
3279                                 break;
3280                         }
3281
3282                         protocolname = MSG_ReadString(&sv_message, sv_readstring, sizeof(sv_readstring));
3283                         protocolnumber = MSG_ReadByte(&sv_message);
3284                         if (strcmp(protocolname, "QUAKE") || protocolnumber != NET_PROTOCOL_VERSION)
3285                         {
3286                                 if (developer_extra.integer)
3287                                         Con_DPrintf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
3288                                 SZ_Clear(&sv_message);
3289                                 // save space for the header, filled in later
3290                                 MSG_WriteLong(&sv_message, 0);
3291                                 MSG_WriteByte(&sv_message, CCREP_REJECT);
3292                                 MSG_WriteString(&sv_message, "Incompatible version.\n");
3293                                 StoreBigLong(sv_message.data, NETFLAG_CTL | (sv_message.cursize & NETFLAG_LENGTH_MASK));
3294                                 NetConn_Write(mysocket, sv_message.data, sv_message.cursize, peeraddress);
3295                                 SZ_Clear(&sv_message);
3296                                 break;
3297                         }
3298
3299                         // see if this connect request comes from a known client
3300                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
3301                         {
3302                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
3303                                 {
3304                                         // this is either a duplicate connection request
3305                                         // or coming back from a timeout
3306                                         // (if so, keep their stuff intact)
3307
3308                                         crypto_t *crypto = Crypto_ServerGetInstance(peeraddress);
3309                                         if((crypto && crypto->authenticated) || client->netconnection->crypto.authenticated)
3310                                         {
3311                                                 if (developer_extra.integer)
3312                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Attempt to downgrade crypto.\" to %s.\n", addressstring2);
3313                                                 SZ_Clear(&sv_message);
3314                                                 // save space for the header, filled in later
3315                                                 MSG_WriteLong(&sv_message, 0);
3316                                                 MSG_WriteByte(&sv_message, CCREP_REJECT);
3317                                                 MSG_WriteString(&sv_message, "Attempt to downgrade crypto.\n");
3318                                                 StoreBigLong(sv_message.data, NETFLAG_CTL | (sv_message.cursize & NETFLAG_LENGTH_MASK));
3319                                                 NetConn_Write(mysocket, sv_message.data, sv_message.cursize, peeraddress);
3320                                                 SZ_Clear(&sv_message);
3321                                                 return true;
3322                                         }
3323
3324                                         // send a reply
3325                                         if (developer_extra.integer)
3326                                                 Con_DPrintf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
3327                                         SZ_Clear(&sv_message);
3328                                         // save space for the header, filled in later
3329                                         MSG_WriteLong(&sv_message, 0);
3330                                         MSG_WriteByte(&sv_message, CCREP_ACCEPT);
3331                                         MSG_WriteLong(&sv_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
3332                                         StoreBigLong(sv_message.data, NETFLAG_CTL | (sv_message.cursize & NETFLAG_LENGTH_MASK));
3333                                         NetConn_Write(mysocket, sv_message.data, sv_message.cursize, peeraddress);
3334                                         SZ_Clear(&sv_message);
3335
3336                                         // if client is already spawned, re-send the
3337                                         // serverinfo message as they'll need it to play
3338                                         if (client->begun)
3339                                                 SV_SendServerinfo(client);
3340                                         return true;
3341                                 }
3342                         }
3343
3344                         // this is a new client, check for connection flood
3345                         if (NetConn_PreventFlood(peeraddress, sv.connectfloodaddresses, sizeof(sv.connectfloodaddresses) / sizeof(sv.connectfloodaddresses[0]), net_connectfloodblockingtimeout.value, true))
3346                                 break;
3347
3348                         // find a slot for the new client
3349                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
3350                         {
3351                                 netconn_t *conn;
3352                                 if (!client->active && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
3353                                 {
3354                                         // connect to the client
3355                                         // everything is allocated, just fill in the details
3356                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
3357                                         if (developer_extra.integer)
3358                                                 Con_DPrintf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
3359                                         // send back the info about the server connection
3360                                         SZ_Clear(&sv_message);
3361                                         // save space for the header, filled in later
3362                                         MSG_WriteLong(&sv_message, 0);
3363                                         MSG_WriteByte(&sv_message, CCREP_ACCEPT);
3364                                         MSG_WriteLong(&sv_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
3365                                         StoreBigLong(sv_message.data, NETFLAG_CTL | (sv_message.cursize & NETFLAG_LENGTH_MASK));
3366                                         NetConn_Write(mysocket, sv_message.data, sv_message.cursize, peeraddress);
3367                                         SZ_Clear(&sv_message);
3368                                         // now set up the client struct
3369                                         SV_ConnectClient(clientnum, conn);
3370                                         NetConn_Heartbeat(1);
3371                                         return true;
3372                                 }
3373                         }
3374
3375                         if (developer_extra.integer)
3376                                 Con_DPrintf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
3377                         // no room; try to let player know
3378                         SZ_Clear(&sv_message);
3379                         // save space for the header, filled in later
3380                         MSG_WriteLong(&sv_message, 0);
3381                         MSG_WriteByte(&sv_message, CCREP_REJECT);
3382                         MSG_WriteString(&sv_message, "Server is full.\n");
3383                         StoreBigLong(sv_message.data, NETFLAG_CTL | (sv_message.cursize & NETFLAG_LENGTH_MASK));
3384                         NetConn_Write(mysocket, sv_message.data, sv_message.cursize, peeraddress);
3385                         SZ_Clear(&sv_message);
3386                         break;
3387                 case CCREQ_SERVER_INFO:
3388                         if (developer_extra.integer)
3389                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
3390                         if(!(islocal || sv_public.integer > -1))
3391                                 break;
3392
3393                         if (NetConn_PreventFlood(peeraddress, sv.getstatusfloodaddresses, sizeof(sv.getstatusfloodaddresses) / sizeof(sv.getstatusfloodaddresses[0]), net_getstatusfloodblockingtimeout.value, false))
3394                                 break;
3395
3396                         if (sv.active && !strcmp(MSG_ReadString(&sv_message, sv_readstring, sizeof(sv_readstring)), "QUAKE"))
3397                         {
3398                                 int numclients;
3399                                 char myaddressstring[128];
3400                                 if (developer_extra.integer)
3401                                         Con_DPrintf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
3402                                 SZ_Clear(&sv_message);
3403                                 // save space for the header, filled in later
3404                                 MSG_WriteLong(&sv_message, 0);
3405                                 MSG_WriteByte(&sv_message, CCREP_SERVER_INFO);
3406                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), myaddressstring, sizeof(myaddressstring), true);
3407                                 MSG_WriteString(&sv_message, myaddressstring);
3408                                 MSG_WriteString(&sv_message, hostname.string);
3409                                 MSG_WriteString(&sv_message, sv.name);
3410                                 // How many clients are there?
3411                                 for (i = 0, numclients = 0;i < svs.maxclients;i++)
3412                                         if (svs.clients[i].active)
3413                                                 numclients++;
3414                                 MSG_WriteByte(&sv_message, numclients);
3415                                 MSG_WriteByte(&sv_message, svs.maxclients);
3416                                 MSG_WriteByte(&sv_message, NET_PROTOCOL_VERSION);
3417                                 StoreBigLong(sv_message.data, NETFLAG_CTL | (sv_message.cursize & NETFLAG_LENGTH_MASK));
3418                                 NetConn_Write(mysocket, sv_message.data, sv_message.cursize, peeraddress);
3419                                 SZ_Clear(&sv_message);
3420                         }
3421                         break;
3422                 case CCREQ_PLAYER_INFO:
3423                         if (developer_extra.integer)
3424                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
3425                         if(!(islocal || sv_public.integer > -1))
3426                                 break;
3427
3428                         if (NetConn_PreventFlood(peeraddress, sv.getstatusfloodaddresses, sizeof(sv.getstatusfloodaddresses) / sizeof(sv.getstatusfloodaddresses[0]), net_getstatusfloodblockingtimeout.value, false))
3429                                 break;
3430
3431                         if (sv.active)
3432                         {
3433                                 int playerNumber, activeNumber, clientNumber;
3434                                 client_t *client;
3435
3436                                 playerNumber = MSG_ReadByte(&sv_message);
3437                                 activeNumber = -1;
3438                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
3439                                         if (client->active && ++activeNumber == playerNumber)
3440                                                 break;
3441                                 if (clientNumber != svs.maxclients)
3442                                 {
3443                                         SZ_Clear(&sv_message);
3444                                         // save space for the header, filled in later
3445                                         MSG_WriteLong(&sv_message, 0);
3446                                         MSG_WriteByte(&sv_message, CCREP_PLAYER_INFO);
3447                                         MSG_WriteByte(&sv_message, playerNumber);
3448                                         MSG_WriteString(&sv_message, client->name);
3449                                         MSG_WriteLong(&sv_message, client->colors);
3450                                         MSG_WriteLong(&sv_message, client->frags);
3451                                         MSG_WriteLong(&sv_message, (int)(realtime - client->connecttime));
3452                                         if(sv_status_privacy.integer)
3453                                                 MSG_WriteString(&sv_message, client->netconnection ? "hidden" : "botclient");
3454                                         else
3455                                                 MSG_WriteString(&sv_message, client->netconnection ? client->netconnection->address : "botclient");
3456                                         StoreBigLong(sv_message.data, NETFLAG_CTL | (sv_message.cursize & NETFLAG_LENGTH_MASK));
3457                                         NetConn_Write(mysocket, sv_message.data, sv_message.cursize, peeraddress);
3458                                         SZ_Clear(&sv_message);
3459                                 }
3460                         }
3461                         break;
3462                 case CCREQ_RULE_INFO:
3463                         if (developer_extra.integer)
3464                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
3465                         if(!(islocal || sv_public.integer > -1))
3466                                 break;
3467
3468                         // no flood check here, as it only returns one cvar for one cvar and clients may iterate quickly
3469
3470                         if (sv.active)
3471                         {
3472                                 char *prevCvarName;
3473                                 cvar_t *var;
3474
3475                                 // find the search start location
3476                                 prevCvarName = MSG_ReadString(&sv_message, sv_readstring, sizeof(sv_readstring));
3477                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
3478
3479                                 // send the response
3480                                 SZ_Clear(&sv_message);
3481                                 // save space for the header, filled in later
3482                                 MSG_WriteLong(&sv_message, 0);
3483                                 MSG_WriteByte(&sv_message, CCREP_RULE_INFO);
3484                                 if (var)
3485                                 {
3486                                         MSG_WriteString(&sv_message, var->name);
3487                                         MSG_WriteString(&sv_message, var->string);
3488                                 }
3489                                 StoreBigLong(sv_message.data, NETFLAG_CTL | (sv_message.cursize & NETFLAG_LENGTH_MASK));
3490                                 NetConn_Write(mysocket, sv_message.data, sv_message.cursize, peeraddress);
3491                                 SZ_Clear(&sv_message);
3492                         }
3493                         break;
3494                 case CCREQ_RCON:
3495                         if (developer_extra.integer)
3496                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREQ_RCON from %s.\n", addressstring2);
3497                         if (sv.active && !rcon_secure.integer)
3498                         {
3499                                 char password[2048];
3500                                 char cmd[2048];
3501                                 char *s;
3502                                 char *endpos;
3503                                 const char *userlevel;
3504                                 strlcpy(password, MSG_ReadString(&sv_message, sv_readstring, sizeof(sv_readstring)), sizeof(password));
3505                                 strlcpy(cmd, MSG_ReadString(&sv_message, sv_readstring, sizeof(sv_readstring)), sizeof(cmd));
3506                                 s = cmd;
3507                                 endpos = cmd + strlen(cmd) + 1; // one behind the NUL, so adding strlen+1 will eventually reach it
3508                                 userlevel = RCon_Authenticate(peeraddress, password, s, endpos, plaintext_matching, NULL, 0);
3509                                 RCon_Execute(mysocket, peeraddress, addressstring2, userlevel, s, endpos, true);
3510                                 return true;
3511                         }
3512                         break;
3513                 default:
3514                         break;
3515                 }
3516                 SZ_Clear(&sv_message);
3517                 // we may not have liked the packet, but it was a valid control
3518                 // packet, so we're done processing this packet now
3519                 return true;
3520         }
3521         if (host_client)
3522         {
3523                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length, sv.protocol, host_client->begun ? net_messagetimeout.value : net_connecttimeout.value)) == 2)
3524                 {
3525                         SV_ReadClientMessage();
3526                         return ret;
3527                 }
3528         }
3529         return 0;
3530 }
3531
3532 void NetConn_ServerFrame(void)
3533 {
3534         int i, length;
3535         lhnetaddress_t peeraddress;
3536         unsigned char readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
3537         for (i = 0;i < sv_numsockets;i++)
3538                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
3539                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
3540         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
3541         {
3542                 // never timeout loopback connections
3543                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
3544                 {
3545                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
3546                         SV_DropClient(false);
3547                 }
3548         }
3549 }
3550
3551 void NetConn_SleepMicroseconds(int microseconds)
3552 {
3553         LHNET_SleepUntilPacket_Microseconds(microseconds);
3554 }
3555
3556 #ifdef CONFIG_MENU
3557 void NetConn_QueryMasters(qboolean querydp, qboolean queryqw)
3558 {
3559         int i, j;
3560         int masternum;
3561         lhnetaddress_t masteraddress;
3562         lhnetaddress_t broadcastaddress;
3563         char request[256];
3564
3565         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
3566                 return;
3567
3568         // 26000 is the default quake server port, servers on other ports will not
3569         // be found
3570         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
3571         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
3572
3573         if (querydp)
3574         {
3575                 for (i = 0;i < cl_numsockets;i++)
3576                 {
3577                         if (cl_sockets[i])
3578                         {
3579                                 const char *cmdname, *extraoptions;
3580                                 int af = LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i]));
3581
3582                                 if(LHNETADDRESS_GetAddressType(&broadcastaddress) == af)
3583                                 {
3584                                         // search LAN for Quake servers
3585                                         SZ_Clear(&cl_message);
3586                                         // save space for the header, filled in later
3587                                         MSG_WriteLong(&cl_message, 0);
3588                                         MSG_WriteByte(&cl_message, CCREQ_SERVER_INFO);
3589                                         MSG_WriteString(&cl_message, "QUAKE");
3590                                         MSG_WriteByte(&cl_message, NET_PROTOCOL_VERSION);
3591                                         StoreBigLong(cl_message.data, NETFLAG_CTL | (cl_message.cursize & NETFLAG_LENGTH_MASK));
3592                                         NetConn_Write(cl_sockets[i], cl_message.data, cl_message.cursize, &broadcastaddress);
3593                                         SZ_Clear(&cl_message);
3594
3595                                         // search LAN for DarkPlaces servers
3596                                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377getstatus", &broadcastaddress);
3597                                 }
3598
3599                                 // build the getservers message to send to the dpmaster master servers
3600                                 if (LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == LHNETADDRESSTYPE_INET6)
3601                                 {
3602                                         cmdname = "getserversExt";
3603                                         extraoptions = " ipv4 ipv6";  // ask for IPv4 and IPv6 servers
3604                                 }
3605                                 else
3606                                 {
3607                                         cmdname = "getservers";
3608                                         extraoptions = "";
3609                                 }
3610                                 dpsnprintf(request, sizeof(request), "\377\377\377\377%s %s %u empty full%s", cmdname, gamenetworkfiltername, NET_PROTOCOL_VERSION, extraoptions);
3611
3612                                 // search internet
3613                                 for (masternum = 0;sv_masters[masternum].name;masternum++)
3614                                 {
3615                                         if (sv_masters[masternum].string && sv_masters[masternum].string[0] && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, DPMASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == af)
3616                                         {
3617                                                 masterquerycount++;
3618                                                 NetConn_WriteString(cl_sockets[i], request, &masteraddress);
3619                                         }
3620                                 }
3621
3622                                 // search favorite servers
3623                                 for(j = 0; j < nFavorites; ++j)
3624                                 {
3625                                         if(LHNETADDRESS_GetAddressType(&favorites[j]) == af)
3626                                         {
3627                                                 if(LHNETADDRESS_ToString(&favorites[j], request, sizeof(request), true))
3628                                                         NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_DARKPLACES7, request, true );
3629                                         }
3630                                 }
3631                         }
3632                 }
3633         }
3634
3635         // only query QuakeWorld servers when the user wants to
3636         if (queryqw)
3637         {
3638                 for (i = 0;i < cl_numsockets;i++)
3639                 {
3640                         if (cl_sockets[i])
3641                         {
3642                                 int af = LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i]));
3643
3644                                 if(LHNETADDRESS_GetAddressType(&broadcastaddress) == af)
3645                                 {
3646                                         // search LAN for QuakeWorld servers
3647                                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377status\n", &broadcastaddress);
3648
3649                                         // build the getservers message to send to the qwmaster master servers
3650                                         // note this has no -1 prefix, and the trailing nul byte is sent
3651                                         dpsnprintf(request, sizeof(request), "c\n");
3652                                 }
3653
3654                                 // search internet
3655                                 for (masternum = 0;sv_qwmasters[masternum].name;masternum++)
3656                                 {
3657                                         if (sv_qwmasters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_qwmasters[masternum].string, QWMASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
3658                                         {
3659                                                 if (m_state != m_slist)
3660                                                 {
3661                                                         char lookupstring[128];
3662                                                         LHNETADDRESS_ToString(&masteraddress, lookupstring, sizeof(lookupstring), true);
3663                                                         Con_Printf("Querying master %s (resolved from %s)\n", lookupstring, sv_qwmasters[masternum].string);
3664                                                 }
3665                                                 masterquerycount++;
3666                                                 NetConn_Write(cl_sockets[i], request, (int)strlen(request) + 1, &masteraddress);
3667                                         }
3668                                 }
3669
3670                                 // search favorite servers
3671                                 for(j = 0; j < nFavorites; ++j)
3672                                 {
3673                                         if(LHNETADDRESS_GetAddressType(&favorites[j]) == af)
3674                                         {
3675                                                 if(LHNETADDRESS_ToString(&favorites[j], request, sizeof(request), true))
3676                                                 {
3677                                                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377status\n", &favorites[j]);
3678                                                         NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_QUAKEWORLD, request, true );
3679                                                 }
3680                                         }
3681                                 }
3682                         }
3683                 }
3684         }
3685         if (!masterquerycount)
3686         {
3687                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
3688                 M_Update_Return_Reason("No network");
3689         }
3690 }
3691 #endif
3692
3693 void NetConn_Heartbeat(int priority)
3694 {
3695         lhnetaddress_t masteraddress;
3696         int masternum;
3697         lhnetsocket_t *mysocket;
3698
3699         // if it's a state change (client connected), limit next heartbeat to no
3700         // more than 30 sec in the future
3701         if (priority == 1 && nextheartbeattime > realtime + 30.0)
3702                 nextheartbeattime = realtime + 30.0;
3703
3704         // limit heartbeatperiod to 30 to 270 second range,
3705         // lower limit is to avoid abusing master servers with excess traffic,
3706         // upper limit is to avoid timing out on the master server (which uses
3707         // 300 sec timeout)
3708         if (sv_heartbeatperiod.value < 30)
3709                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
3710         if (sv_heartbeatperiod.value > 270)
3711                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
3712
3713         // make advertising optional and don't advertise singleplayer games, and
3714         // only send a heartbeat as often as the admin wants
3715         if (sv.active && sv_public.integer > 0 && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
3716         {
3717                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
3718                 for (masternum = 0;sv_masters[masternum].name;masternum++)
3719                         if (sv_masters[masternum].string && sv_masters[masternum].string[0] && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, DPMASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
3720                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
3721         }
3722 }
3723
3724 static void Net_Heartbeat_f(void)
3725 {
3726         if (sv.active)
3727                 NetConn_Heartbeat(2);
3728         else
3729                 Con_Print("No server running, can not heartbeat to master server.\n");
3730 }
3731
3732 static void PrintStats(netconn_t *conn)
3733 {
3734         if ((cls.state == ca_connected && cls.protocol == PROTOCOL_QUAKEWORLD) || (sv.active && sv.protocol == PROTOCOL_QUAKEWORLD))
3735                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->outgoing_unreliable_sequence, conn->qw.incoming_sequence);
3736         else
3737                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->nq.sendSequence, conn->nq.receiveSequence);
3738         Con_Printf("unreliable messages sent   = %i\n", conn->unreliableMessagesSent);
3739         Con_Printf("unreliable messages recv   = %i\n", conn->unreliableMessagesReceived);
3740         Con_Printf("reliable messages sent     = %i\n", conn->reliableMessagesSent);
3741         Con_Printf("reliable messages received = %i\n", conn->reliableMessagesReceived);
3742         Con_Printf("packetsSent                = %i\n", conn->packetsSent);
3743         Con_Printf("packetsReSent              = %i\n", conn->packetsReSent);
3744         Con_Printf("packetsReceived            = %i\n", conn->packetsReceived);
3745         Con_Printf("receivedDuplicateCount     = %i\n", conn->receivedDuplicateCount);
3746         Con_Printf("droppedDatagrams           = %i\n", conn->droppedDatagrams);
3747 }
3748
3749 void Net_Stats_f(void)
3750 {
3751         netconn_t *conn;
3752         Con_Print("connections                =\n");
3753         for (conn = netconn_list;conn;conn = conn->next)
3754                 PrintStats(conn);
3755 }
3756
3757 #ifdef CONFIG_MENU
3758 void Net_Refresh_f(void)
3759 {
3760         if (m_state != m_slist) {
3761                 Con_Print("Sending new requests to master servers\n");
3762                 ServerList_QueryList(false, true, false, true);
3763                 Con_Print("Listening for replies...\n");
3764         } else
3765                 ServerList_QueryList(false, true, false, false);
3766 }
3767
3768 void Net_Slist_f(void)
3769 {
3770         ServerList_ResetMasks();
3771         serverlist_sortbyfield = SLIF_PING;
3772         serverlist_sortflags = 0;
3773     if (m_state != m_slist) {
3774                 Con_Print("Sending requests to master servers\n");
3775                 ServerList_QueryList(true, true, false, true);
3776                 Con_Print("Listening for replies...\n");
3777         } else
3778                 ServerList_QueryList(true, true, false, false);
3779 }
3780
3781 void Net_SlistQW_f(void)
3782 {
3783         ServerList_ResetMasks();
3784         serverlist_sortbyfield = SLIF_PING;
3785         serverlist_sortflags = 0;
3786     if (m_state != m_slist) {
3787                 Con_Print("Sending requests to master servers\n");
3788                 ServerList_QueryList(true, false, true, true);
3789                 serverlist_consoleoutput = true;
3790                 Con_Print("Listening for replies...\n");
3791         } else
3792                 ServerList_QueryList(true, false, true, false);
3793 }
3794 #endif
3795
3796 void NetConn_Init(void)
3797 {
3798         int i;
3799         lhnetaddress_t tempaddress;
3800         netconn_mempool = Mem_AllocPool("network connections", 0, NULL);
3801         Cmd_AddCommand("net_stats", Net_Stats_f, "print network statistics");
3802 #ifdef CONFIG_MENU
3803         Cmd_AddCommand("net_slist", Net_Slist_f, "query dp master servers and print all server information");
3804         Cmd_AddCommand("net_slistqw", Net_SlistQW_f, "query qw master servers and print all server information");
3805         Cmd_AddCommand("net_refresh", Net_Refresh_f, "query dp master servers and refresh all server information");
3806 #endif
3807         Cmd_AddCommand("heartbeat", Net_Heartbeat_f, "send a heartbeat to the master server (updates your server information)");
3808         Cvar_RegisterVariable(&net_test);
3809         Cvar_RegisterVariable(&net_usesizelimit);
3810         Cvar_RegisterVariable(&net_burstreserve);
3811         Cvar_RegisterVariable(&rcon_restricted_password);
3812         Cvar_RegisterVariable(&rcon_restricted_commands);
3813         Cvar_RegisterVariable(&rcon_secure_maxdiff);
3814         Cvar_RegisterVariable(&net_slist_queriespersecond);
3815         Cvar_RegisterVariable(&net_slist_queriesperframe);
3816         Cvar_RegisterVariable(&net_slist_timeout);
3817         Cvar_RegisterVariable(&net_slist_maxtries);
3818         Cvar_RegisterVariable(&net_slist_favorites);
3819         Cvar_RegisterVariable(&net_slist_pause);
3820         if(LHNET_DefaultDSCP(-1) >= 0) // register cvar only if supported
3821                 Cvar_RegisterVariable(&net_tos_dscp);
3822         Cvar_RegisterVariable(&net_messagetimeout);
3823         Cvar_RegisterVariable(&net_connecttimeout);
3824         Cvar_RegisterVariable(&net_connectfloodblockingtimeout);
3825         Cvar_RegisterVariable(&net_challengefloodblockingtimeout);
3826         Cvar_RegisterVariable(&net_getstatusfloodblockingtimeout);
3827         Cvar_RegisterVariable(&cl_netlocalping);
3828         Cvar_RegisterVariable(&cl_netpacketloss_send);
3829         Cvar_RegisterVariable(&cl_netpacketloss_receive);
3830         Cvar_RegisterVariable(&hostname);
3831         Cvar_RegisterVariable(&developer_networking);
3832         Cvar_RegisterVariable(&cl_netport);
3833         Cvar_RegisterVariable(&sv_netport);
3834         Cvar_RegisterVariable(&net_address);
3835         Cvar_RegisterVariable(&net_address_ipv6);
3836         Cvar_RegisterVariable(&sv_public);
3837         Cvar_RegisterVariable(&sv_public_rejectreason);
3838         Cvar_RegisterVariable(&sv_heartbeatperiod);
3839         for (i = 0;sv_masters[i].name;i++)
3840                 Cvar_RegisterVariable(&sv_masters[i]);
3841         Cvar_RegisterVariable(&gameversion);
3842         Cvar_RegisterVariable(&gameversion_min);
3843         Cvar_RegisterVariable(&gameversion_max);
3844 // COMMANDLINEOPTION: Server: -ip <ipaddress> sets the ip address of this machine for purposes of networking (default 0.0.0.0 also known as INADDR_ANY), use only if you have multiple network adapters and need to choose one specifically.
3845         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
3846         {
3847                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
3848                 {
3849                         Con_Printf("-ip option used, setting net_address to \"%s\"\n", com_argv[i + 1]);
3850                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
3851                 }
3852                 else
3853                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
3854         }
3855 // COMMANDLINEOPTION: Server: -port <portnumber> sets the port to use for a server (default 26000, the same port as QUAKE itself), useful if you host multiple servers on your machine
3856         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
3857         {
3858                 i = atoi(com_argv[i + 1]);
3859                 if (i >= 0 && i < 65536)
3860                 {
3861                         Con_Printf("-port option used, setting port cvar to %i\n", i);
3862                         Cvar_SetValueQuick(&sv_netport, i);
3863                 }
3864                 else
3865                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
3866         }
3867         cl_numsockets = 0;
3868         sv_numsockets = 0;
3869         cl_message.data = cl_message_buf;
3870         cl_message.maxsize = sizeof(cl_message_buf);
3871         cl_message.cursize = 0;
3872         sv_message.data = sv_message_buf;
3873         sv_message.maxsize = sizeof(sv_message_buf);
3874         sv_message.cursize = 0;
3875         LHNET_Init();
3876         if (Thread_HasThreads())
3877                 netconn_mutex = Thread_CreateMutex();
3878 }
3879
3880 void NetConn_Shutdown(void)
3881 {
3882         NetConn_CloseClientPorts();
3883         NetConn_CloseServerPorts();
3884         LHNET_Shutdown();
3885         if (netconn_mutex)
3886                 Thread_DestroyMutex(netconn_mutex);
3887         netconn_mutex = NULL;
3888 }
3889