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 "lhnet.h"
  25
  26 #define MASTER_PORT 27950
  27
  28 // note this defaults on for dedicated servers, off for listen servers
  29 cvar_t sv_public = {0, "sv_public", "0"};
  30 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "120"};
  31
  32 // FIXME: resolve DNS on masters whenever their value changes and cache it (to avoid major delays in active servers when they heartbeat)
  33 static cvar_t sv_masters [] =
  34 {
  35         {CVAR_SAVE, "sv_master1", ""},
  36         {CVAR_SAVE, "sv_master2", ""},
  37         {CVAR_SAVE, "sv_master3", ""},
  38         {CVAR_SAVE, "sv_master4", ""},
  39         {0, "sv_masterextra1", "ghdigital.com"}, //69.59.212.88
  40         {0, "sv_masterextra2", "dpmaster.deathmask.net"}, //64.253.41.49
  41         {0, "sv_masterextra3", "12.166.196.192"}, //blaze.mindphukd.org (doesn't resolve currently but works as an ip)
  42         {0, NULL, NULL}
  43 };
  44
  45 static double nextheartbeattime = 0;
  46
  47 sizebuf_t net_message;
  48 static unsigned char net_message_buf[NET_MAXMESSAGE];
  49
  50 cvar_t net_messagetimeout = {0, "net_messagetimeout","300"};
  51 cvar_t net_messagerejointimeout = {0, "net_messagerejointimeout","10"};
  52 cvar_t net_connecttimeout = {0, "net_connecttimeout","10"};
  53 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED"};
  54 cvar_t developer_networking = {0, "developer_networking", "0"};
  55
  56 cvar_t cl_netlocalping = {0, "cl_netlocalping","0"};
  57 static cvar_t cl_netpacketloss = {0, "cl_netpacketloss","0"};
  58 static cvar_t net_slist_queriespersecond = {0, "net_slist_queriespersecond", "20"};
  59 static cvar_t net_slist_queriesperframe = {0, "net_slist_queriesperframe", "4"};
  60 static cvar_t net_slist_timeout = {0, "net_slist_timeout", "4"};
  61 static cvar_t net_slist_maxtries = {0, "net_slist_maxtries", "3"};
  62
  63 /* statistic counters */
  64 static int packetsSent = 0;
  65 static int packetsReSent = 0;
  66 static int packetsReceived = 0;
  67 static int receivedDuplicateCount = 0;
  68 static int droppedDatagrams = 0;
  69
  70 static int unreliableMessagesSent = 0;
  71 static int unreliableMessagesReceived = 0;
  72 static int reliableMessagesSent = 0;
  73 static int reliableMessagesReceived = 0;
  74
  75 double masterquerytime = -1000;
  76 int masterquerycount = 0;
  77 int masterreplycount = 0;
  78 int serverquerycount = 0;
  79 int serverreplycount = 0;
  80
  81 // this is only false if there are still servers left to query
  82 int serverlist_querysleep = true;
  83
  84 static unsigned char sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  85 static unsigned char readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  86
  87 int cl_numsockets;
  88 lhnetsocket_t *cl_sockets[16];
  89 int sv_numsockets;
  90 lhnetsocket_t *sv_sockets[16];
  91
  92 netconn_t *netconn_list = NULL;
  93 mempool_t *netconn_mempool = NULL;
  94
  95 cvar_t cl_netport = {0, "cl_port", "0"};
  96 cvar_t sv_netport = {0, "port", "26000"};
  97 cvar_t net_address = {0, "net_address", "0.0.0.0"};
  98 //cvar_t net_netaddress_ipv6 = {0, "net_address_ipv6", "[0:0:0:0:0:0:0:0]"};
  99
 100 // ServerList interface
 101 serverlist_mask_t serverlist_andmasks[SERVERLIST_ANDMASKCOUNT];
 102 serverlist_mask_t serverlist_ormasks[SERVERLIST_ORMASKCOUNT];
 103
 104 serverlist_infofield_t serverlist_sortbyfield;
 105 qboolean serverlist_sortdescending;
 106
 107 int serverlist_viewcount = 0;
 108 serverlist_entry_t *serverlist_viewlist[SERVERLIST_VIEWLISTSIZE];
 109
 110 int serverlist_cachecount;
 111 serverlist_entry_t serverlist_cache[SERVERLIST_TOTALSIZE];
 112
 113 qboolean serverlist_consoleoutput;
 114
 115 // helper function to insert a value into the viewset
 116 // spare entries will be removed
 117 static void _ServerList_ViewList_Helper_InsertBefore( int index, serverlist_entry_t *entry )
 118 {
 119     int i;
 120         if( serverlist_viewcount < SERVERLIST_VIEWLISTSIZE ) {
 121                 i = serverlist_viewcount++;
 122         } else {
 123                 i = SERVERLIST_VIEWLISTSIZE - 1;
 124         }
 125
 126         for( ; i > index ; i-- )
 127                 serverlist_viewlist[ i ] = serverlist_viewlist[ i - 1 ];
 128
 129         serverlist_viewlist[index] = entry;
 130 }
 131
 132 // we suppose serverlist_viewcount to be valid, ie > 0
 133 static void _ServerList_ViewList_Helper_Remove( int index )
 134 {
 135         serverlist_viewcount--;
 136         for( ; index < serverlist_viewcount ; index++ )
 137                 serverlist_viewlist[index] = serverlist_viewlist[index + 1];
 138 }
 139
 140 // returns true if A should be inserted before B
 141 static qboolean _ServerList_Entry_Compare( serverlist_entry_t *A, serverlist_entry_t *B )
 142 {
 143         int result = 0; // > 0 if for numbers A > B and for text if A < B
 144
 145         switch( serverlist_sortbyfield ) {
 146                 case SLIF_PING:
 147                         result = A->info.ping - B->info.ping;
 148                         break;
 149                 case SLIF_MAXPLAYERS:
 150                         result = A->info.maxplayers - B->info.maxplayers;
 151                         break;
 152                 case SLIF_NUMPLAYERS:
 153                         result = A->info.numplayers - B->info.numplayers;
 154                         break;
 155                 case SLIF_PROTOCOL:
 156                         result = A->info.protocol - B->info.protocol;
 157                         break;
 158                 case SLIF_CNAME:
 159                         result = strcmp( B->info.cname, A->info.cname );
 160                         break;
 161                 case SLIF_GAME:
 162                         result = strcmp( B->info.game, A->info.game );
 163                         break;
 164                 case SLIF_MAP:
 165                         result = strcmp( B->info.map, A->info.map );
 166                         break;
 167                 case SLIF_MOD:
 168                         result = strcmp( B->info.mod, A->info.mod );
 169                         break;
 170                 case SLIF_NAME:
 171                         result = strcmp( B->info.name, A->info.name );
 172                         break;
 173                 default:
 174                         Con_DPrint( "_ServerList_Entry_Compare: Bad serverlist_sortbyfield!\n" );
 175                         break;
 176         }
 177
 178         if( serverlist_sortdescending )
 179                 return result > 0;
 180         return result < 0;
 181 }
 182
 183 static qboolean _ServerList_CompareInt( int A, serverlist_maskop_t op, int B )
 184 {
 185         // This should actually be done with some intermediate and end-of-function return
 186         switch( op ) {
 187                 case SLMO_LESS:
 188                         return A < B;
 189                 case SLMO_LESSEQUAL:
 190                         return A <= B;
 191                 case SLMO_EQUAL:
 192                         return A == B;
 193                 case SLMO_GREATER:
 194                         return A > B;
 195                 case SLMO_NOTEQUAL:
 196                         return A != B;
 197                 case SLMO_GREATEREQUAL:
 198                 case SLMO_CONTAINS:
 199                 case SLMO_NOTCONTAIN:
 200                         return A >= B;
 201                 default:
 202                         Con_DPrint( "_ServerList_CompareInt: Bad op!\n" );
 203                         return false;
 204         }
 205 }
 206
 207 static qboolean _ServerList_CompareStr( const char *A, serverlist_maskop_t op, const char *B )
 208 {
 209         int i;
 210         char bufferA[ 256 ], bufferB[ 256 ]; // should be more than enough
 211         for (i = 0;i < (int)sizeof(bufferA)-1 && A[i];i++)
 212                 bufferA[i] = (A[i] >= 'A' && A[i] <= 'Z') ? (A[i] + 'a' - 'A') : A[i];
 213         bufferA[i] = 0;
 214         for (i = 0;i < (int)sizeof(bufferB)-1 && B[i];i++)
 215                 bufferB[i] = (B[i] >= 'A' && B[i] <= 'Z') ? (B[i] + 'a' - 'A') : B[i];
 216         bufferB[i] = 0;
 217
 218         // Same here, also using an intermediate & final return would be more appropriate
 219         // A info B mask
 220         switch( op ) {
 221                 case SLMO_CONTAINS:
 222                         return *bufferB && !!strstr( bufferA, bufferB ); // we want a real bool
 223                 case SLMO_NOTCONTAIN:
 224                         return !*bufferB || !strstr( bufferA, bufferB );
 225                 case SLMO_LESS:
 226                         return strcmp( bufferA, bufferB ) < 0;
 227                 case SLMO_LESSEQUAL:
 228                         return strcmp( bufferA, bufferB ) <= 0;
 229                 case SLMO_EQUAL:
 230                         return strcmp( bufferA, bufferB ) == 0;
 231                 case SLMO_GREATER:
 232                         return strcmp( bufferA, bufferB ) > 0;
 233                 case SLMO_NOTEQUAL:
 234                         return strcmp( bufferA, bufferB ) != 0;
 235                 case SLMO_GREATEREQUAL:
 236                         return strcmp( bufferA, bufferB ) >= 0;
 237                 default:
 238                         Con_DPrint( "_ServerList_CompareStr: Bad op!\n" );
 239                         return false;
 240         }
 241 }
 242
 243 static qboolean _ServerList_Entry_Mask( serverlist_mask_t *mask, serverlist_info_t *info )
 244 {
 245         if( !_ServerList_CompareInt( info->ping, mask->tests[SLIF_PING], mask->info.ping ) )
 246                 return false;
 247         if( !_ServerList_CompareInt( info->maxplayers, mask->tests[SLIF_MAXPLAYERS], mask->info.maxplayers ) )
 248                 return false;
 249         if( !_ServerList_CompareInt( info->numplayers, mask->tests[SLIF_NUMPLAYERS], mask->info.numplayers ) )
 250                 return false;
 251         if( !_ServerList_CompareInt( info->protocol, mask->tests[SLIF_PROTOCOL], mask->info.protocol ))
 252                 return false;
 253         if( *mask->info.cname
 254                 && !_ServerList_CompareStr( info->cname, mask->tests[SLIF_CNAME], mask->info.cname ) )
 255                 return false;
 256         if( *mask->info.game
 257                 && !_ServerList_CompareStr( info->game, mask->tests[SLIF_GAME], mask->info.game ) )
 258                 return false;
 259         if( *mask->info.mod
 260                 && !_ServerList_CompareStr( info->mod, mask->tests[SLIF_MOD], mask->info.mod ) )
 261                 return false;
 262         if( *mask->info.map
 263                 && !_ServerList_CompareStr( info->map, mask->tests[SLIF_MAP], mask->info.map ) )
 264                 return false;
 265         if( *mask->info.name
 266                 && !_ServerList_CompareStr( info->name, mask->tests[SLIF_NAME], mask->info.name ) )
 267                 return false;
 268         return true;
 269 }
 270
 271 static void ServerList_ViewList_Insert( serverlist_entry_t *entry )
 272 {
 273         int start, end, mid;
 274
 275         // FIXME: change this to be more readable (...)
 276         // now check whether it passes through the masks
 277         for( start = 0 ; serverlist_andmasks[start].active && start < SERVERLIST_ANDMASKCOUNT ; start++ )
 278                 if( !_ServerList_Entry_Mask( &serverlist_andmasks[start], &entry->info ) )
 279                         return;
 280
 281         for( start = 0 ; serverlist_ormasks[start].active && start < SERVERLIST_ORMASKCOUNT ; start++ )
 282                 if( _ServerList_Entry_Mask( &serverlist_ormasks[start], &entry->info ) )
 283                         break;
 284         if( start == SERVERLIST_ORMASKCOUNT || (start > 0 && !serverlist_ormasks[start].active) )
 285                 return;
 286
 287         if( !serverlist_viewcount ) {
 288                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 289                 return;
 290         }
 291         // ok, insert it, we just need to find out where exactly:
 292
 293         // two special cases
 294         // check whether to insert it as new first item
 295         if( _ServerList_Entry_Compare( entry, serverlist_viewlist[0] ) ) {
 296                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 297                 return;
 298         } // check whether to insert it as new last item
 299         else if( !_ServerList_Entry_Compare( entry, serverlist_viewlist[serverlist_viewcount - 1] ) ) {
 300                 _ServerList_ViewList_Helper_InsertBefore( serverlist_viewcount, entry );
 301                 return;
 302         }
 303         start = 0;
 304         end = serverlist_viewcount - 1;
 305         while( end > start + 1 )
 306         {
 307                 mid = (start + end) / 2;
 308                 // test the item that lies in the middle between start and end
 309                 if( _ServerList_Entry_Compare( entry, serverlist_viewlist[mid] ) )
 310                         // the item has to be in the upper half
 311                         end = mid;
 312                 else
 313                         // the item has to be in the lower half
 314                         start = mid;
 315         }
 316         _ServerList_ViewList_Helper_InsertBefore( start + 1, entry );
 317 }
 318
 319 static void ServerList_ViewList_Remove( serverlist_entry_t *entry )
 320 {
 321         int i;
 322         for( i = 0; i < serverlist_viewcount; i++ )
 323         {
 324                 if (serverlist_viewlist[i] == entry)
 325                 {
 326                         _ServerList_ViewList_Helper_Remove(i);
 327                         break;
 328                 }
 329         }
 330 }
 331
 332 void ServerList_RebuildViewList(void)
 333 {
 334         int i;
 335
 336         serverlist_viewcount = 0;
 337         for( i = 0 ; i < serverlist_cachecount ; i++ )
 338                 if( serverlist_cache[i].query == SQS_QUERIED )
 339                         ServerList_ViewList_Insert( &serverlist_cache[i] );
 340 }
 341
 342 void ServerList_ResetMasks(void)
 343 {
 344         memset( &serverlist_andmasks, 0, sizeof( serverlist_andmasks ) );
 345         memset( &serverlist_ormasks, 0, sizeof( serverlist_ormasks ) );
 346 }
 347
 348 #if 0
 349 static void _ServerList_Test(void)
 350 {
 351         int i;
 352         for( i = 0 ; i < 1024 ; i++ ) {
 353                 memset( &serverlist_cache[serverlist_cachecount], 0, sizeof( serverlist_entry_t ) );
 354                 serverlist_cache[serverlist_cachecount].info.ping = 1000 + 1024 - i;
 355                 dpsnprintf( serverlist_cache[serverlist_cachecount].info.name, sizeof(serverlist_cache[serverlist_cachecount].info.name), "Black's ServerList Test %i", i );
 356                 serverlist_cache[serverlist_cachecount].finished = true;
 357                 sprintf( serverlist_cache[serverlist_cachecount].line1, "%i %s", serverlist_cache[serverlist_cachecount].info.ping, serverlist_cache[serverlist_cachecount].info.name );
 358                 ServerList_ViewList_Insert( &serverlist_cache[serverlist_cachecount] );
 359                 serverlist_cachecount++;
 360         }
 361 }
 362 #endif
 363
 364 void ServerList_QueryList(void)
 365 {
 366         masterquerytime = realtime;
 367         masterquerycount = 0;
 368         masterreplycount = 0;
 369         serverquerycount = 0;
 370         serverreplycount = 0;
 371         serverlist_cachecount = 0;
 372         serverlist_viewcount = 0;
 373         serverlist_consoleoutput = false;
 374
 375         //_ServerList_Test();
 376
 377         NetConn_QueryMasters();
 378 }
 379
 380 // rest
 381
 382 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
 383 {
 384         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
 385         int i;
 386         if (length == 0)
 387                 return 0;
 388         if (cl_netpacketloss.integer)
 389                 for (i = 0;i < cl_numsockets;i++)
 390                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 391                                 return 0;
 392         if (developer_networking.integer)
 393         {
 394                 char addressstring[128], addressstring2[128];
 395                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 396                 if (length > 0)
 397                 {
 398                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 399                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
 400                         Com_HexDumpToConsole((unsigned char *)data, length);
 401                 }
 402                 else
 403                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
 404         }
 405         return length;
 406 }
 407
 408 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 409 {
 410         int ret;
 411         int i;
 412         if (cl_netpacketloss.integer)
 413                 for (i = 0;i < cl_numsockets;i++)
 414                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 415                                 return length;
 416         ret = LHNET_Write(mysocket, data, length, peeraddress);
 417         if (developer_networking.integer)
 418         {
 419                 char addressstring[128], addressstring2[128];
 420                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 421                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 422                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 423                 Com_HexDumpToConsole((unsigned char *)data, length);
 424         }
 425         return ret;
 426 }
 427
 428 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 429 {
 430         // note this does not include the trailing NULL because we add that in the parser
 431         return NetConn_Write(mysocket, string, (int)strlen(string), peeraddress);
 432 }
 433
 434 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
 435 {
 436         unsigned int packetLen;
 437         unsigned int dataLen;
 438         unsigned int eom;
 439         unsigned int *header;
 440
 441 //#ifdef DEBUG
 442         if (data->cursize == 0)
 443         {
 444                 Con_Printf ("Datagram_SendMessage: zero length message\n");
 445                 return -1;
 446         }
 447
 448         if (data->cursize > (int)sizeof(conn->sendMessage))
 449         {
 450                 Con_Printf ("Datagram_SendMessage: message too big (%u > %u)\n", data->cursize, sizeof(conn->sendMessage));
 451                 return -1;
 452         }
 453
 454         if (conn->canSend == false)
 455         {
 456                 Con_Printf ("SendMessage: called with canSend == false\n");
 457                 return -1;
 458         }
 459 //#endif
 460
 461         memcpy(conn->sendMessage, data->data, data->cursize);
 462         conn->sendMessageLength = data->cursize;
 463
 464         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 465         {
 466                 dataLen = conn->sendMessageLength;
 467                 eom = NETFLAG_EOM;
 468         }
 469         else
 470         {
 471                 dataLen = MAX_PACKETFRAGMENT;
 472                 eom = 0;
 473         }
 474
 475         packetLen = NET_HEADERSIZE + dataLen;
 476
 477         header = (unsigned int *)sendbuffer;
 478         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 479         header[1] = BigLong(conn->sendSequence);
 480         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 481
 482         conn->sendSequence++;
 483         conn->canSend = false;
 484
 485         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 486                 return -1;
 487
 488         conn->lastSendTime = realtime;
 489         packetsSent++;
 490         reliableMessagesSent++;
 491         return 1;
 492 }
 493
 494 static void NetConn_SendMessageNext(netconn_t *conn)
 495 {
 496         unsigned int packetLen;
 497         unsigned int dataLen;
 498         unsigned int eom;
 499         unsigned int *header;
 500
 501         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
 502         {
 503                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 504                 {
 505                         dataLen = conn->sendMessageLength;
 506                         eom = NETFLAG_EOM;
 507                 }
 508                 else
 509                 {
 510                         dataLen = MAX_PACKETFRAGMENT;
 511                         eom = 0;
 512                 }
 513
 514                 packetLen = NET_HEADERSIZE + dataLen;
 515
 516                 header = (unsigned int *)sendbuffer;
 517                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 518                 header[1] = BigLong(conn->sendSequence);
 519                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 520
 521                 conn->sendSequence++;
 522                 conn->sendNext = false;
 523
 524                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 525                         return;
 526
 527                 conn->lastSendTime = realtime;
 528                 packetsSent++;
 529         }
 530 }
 531
 532 static void NetConn_ReSendMessage(netconn_t *conn)
 533 {
 534         unsigned int packetLen;
 535         unsigned int dataLen;
 536         unsigned int eom;
 537         unsigned int *header;
 538
 539         if (conn->sendMessageLength && !conn->canSend && (realtime - conn->lastSendTime) > 1.0)
 540         {
 541                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 542                 {
 543                         dataLen = conn->sendMessageLength;
 544                         eom = NETFLAG_EOM;
 545                 }
 546                 else
 547                 {
 548                         dataLen = MAX_PACKETFRAGMENT;
 549                         eom = 0;
 550                 }
 551
 552                 packetLen = NET_HEADERSIZE + dataLen;
 553
 554                 header = (unsigned int *)sendbuffer;
 555                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 556                 header[1] = BigLong(conn->sendSequence - 1);
 557                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 558
 559                 conn->sendNext = false;
 560
 561                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 562                         return;
 563
 564                 conn->lastSendTime = realtime;
 565                 packetsReSent++;
 566         }
 567 }
 568
 569 qboolean NetConn_CanSendMessage(netconn_t *conn)
 570 {
 571         return conn->canSend;
 572 }
 573
 574 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
 575 {
 576         int packetLen;
 577         unsigned int *header;
 578
 579         packetLen = NET_HEADERSIZE + data->cursize;
 580
 581 //#ifdef DEBUG
 582         if (data->cursize == 0)
 583         {
 584                 Con_Printf ("Datagram_SendUnreliableMessage: zero length message\n");
 585                 return -1;
 586         }
 587
 588         if (packetLen > (int)sizeof(sendbuffer))
 589         {
 590                 Con_Printf ("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
 591                 return -1;
 592         }
 593 //#endif
 594
 595         header = (unsigned int *)sendbuffer;
 596         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
 597         header[1] = BigLong(conn->unreliableSendSequence);
 598         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
 599
 600         conn->unreliableSendSequence++;
 601
 602         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 603                 return -1;
 604
 605         packetsSent++;
 606         unreliableMessagesSent++;
 607         return 1;
 608 }
 609
 610 void NetConn_CloseClientPorts(void)
 611 {
 612         for (;cl_numsockets > 0;cl_numsockets--)
 613                 if (cl_sockets[cl_numsockets - 1])
 614                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 615 }
 616
 617 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
 618 {
 619         lhnetaddress_t address;
 620         lhnetsocket_t *s;
 621         char addressstring2[1024];
 622         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 623         {
 624                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 625                 {
 626                         cl_sockets[cl_numsockets++] = s;
 627                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 628                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
 629                 }
 630                 else
 631                 {
 632                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 633                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
 634                 }
 635         }
 636         else
 637                 Con_Printf("Client unable to parse address %s\n", addressstring);
 638 }
 639
 640 void NetConn_OpenClientPorts(void)
 641 {
 642         int port;
 643         NetConn_CloseClientPorts();
 644         port = bound(0, cl_netport.integer, 65535);
 645         if (cl_netport.integer != port)
 646                 Cvar_SetValueQuick(&cl_netport, port);
 647         Con_Printf("Client using port %i\n", port);
 648         NetConn_OpenClientPort("local:2", 0);
 649         NetConn_OpenClientPort(net_address.string, port);
 650         //NetConn_OpenClientPort(net_address_ipv6.string, port);
 651 }
 652
 653 void NetConn_CloseServerPorts(void)
 654 {
 655         for (;sv_numsockets > 0;sv_numsockets--)
 656                 if (sv_sockets[sv_numsockets - 1])
 657                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 658 }
 659
 660 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
 661 {
 662         lhnetaddress_t address;
 663         lhnetsocket_t *s;
 664         int port;
 665         char addressstring2[1024];
 666
 667         for (port = defaultport; port <= defaultport + 100; port++)
 668         {
 669                 if (LHNETADDRESS_FromString(&address, addressstring, port))
 670                 {
 671                         if ((s = LHNET_OpenSocket_Connectionless(&address)))
 672                         {
 673                                 sv_sockets[sv_numsockets++] = s;
 674                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 675                                 Con_Printf("Server listening on address %s\n", addressstring2);
 676                                 break;
 677                         }
 678                         else
 679                         {
 680                                 LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 681                                 Con_Printf("Server failed to open socket on address %s\n", addressstring2);
 682                         }
 683                 }
 684                 else
 685                 {
 686                         Con_Printf("Server unable to parse address %s\n", addressstring);
 687                         // if it cant parse one address, it wont be able to parse another for sure
 688                         break;
 689                 }
 690         }
 691 }
 692
 693 static void NetConn_UpdateServerStuff(void);
 694 void NetConn_OpenServerPorts(int opennetports)
 695 {
 696         int port;
 697         NetConn_CloseServerPorts();
 698         NetConn_UpdateServerStuff();
 699         port = bound(0, sv_netport.integer, 65535);
 700         if (port == 0)
 701                 port = 26000;
 702         Con_Printf("Server using port %i\n", port);
 703         if (sv_netport.integer != port)
 704                 Cvar_SetValueQuick(&sv_netport, port);
 705         if (cls.state != ca_dedicated)
 706                 NetConn_OpenServerPort("local:1", 0);
 707         if (opennetports)
 708         {
 709                 NetConn_OpenServerPort(net_address.string, port);
 710                 //NetConn_OpenServerPort(net_address_ipv6.string, port);
 711         }
 712         if (sv_numsockets == 0)
 713                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!");
 714 }
 715
 716 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 717 {
 718         int i, a = LHNETADDRESS_GetAddressType(address);
 719         for (i = 0;i < cl_numsockets;i++)
 720                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 721                         return cl_sockets[i];
 722         return NULL;
 723 }
 724
 725 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 726 {
 727         int i, a = LHNETADDRESS_GetAddressType(address);
 728         for (i = 0;i < sv_numsockets;i++)
 729                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 730                         return sv_sockets[i];
 731         return NULL;
 732 }
 733
 734 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 735 {
 736         netconn_t *conn;
 737         conn = (netconn_t *)Mem_Alloc(netconn_mempool, sizeof(*conn));
 738         conn->mysocket = mysocket;
 739         conn->peeraddress = *peeraddress;
 740         conn->canSend = true;
 741         conn->lastMessageTime = realtime;
 742         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
 743         // reduce effectiveness of connection request floods
 744         conn->timeout = realtime + net_connecttimeout.value;
 745         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
 746         conn->next = netconn_list;
 747         netconn_list = conn;
 748         return conn;
 749 }
 750
 751 void NetConn_Close(netconn_t *conn)
 752 {
 753         netconn_t *c;
 754         // remove connection from list
 755         if (conn == netconn_list)
 756                 netconn_list = conn->next;
 757         else
 758         {
 759                 for (c = netconn_list;c;c = c->next)
 760                 {
 761                         if (c->next == conn)
 762                         {
 763                                 c->next = conn->next;
 764                                 break;
 765                         }
 766                 }
 767                 // not found in list, we'll avoid crashing here...
 768                 if (!c)
 769                         return;
 770         }
 771         // free connection
 772         Mem_Free(conn);
 773 }
 774
 775 static int clientport = -1;
 776 static int clientport2 = -1;
 777 static int hostport = -1;
 778 static void NetConn_UpdateServerStuff(void)
 779 {
 780         if (cls.state != ca_dedicated)
 781         {
 782                 if (clientport2 != cl_netport.integer)
 783                 {
 784                         clientport2 = cl_netport.integer;
 785                         if (cls.state == ca_connected)
 786                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
 787                 }
 788                 if (cls.state == ca_disconnected && clientport != clientport2)
 789                 {
 790                         clientport = clientport2;
 791                         NetConn_CloseClientPorts();
 792                 }
 793                 if (cl_numsockets == 0)
 794                         NetConn_OpenClientPorts();
 795         }
 796
 797         if (hostport != sv_netport.integer)
 798         {
 799                 hostport = sv_netport.integer;
 800                 if (sv.active)
 801                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
 802         }
 803 }
 804
 805 int NetConn_ReceivedMessage(netconn_t *conn, unsigned char *data, int length)
 806 {
 807         unsigned int count;
 808         unsigned int flags;
 809         unsigned int sequence;
 810         int qlength;
 811
 812         if (length >= 8)
 813         {
 814                 qlength = (unsigned int)BigLong(((int *)data)[0]);
 815                 flags = qlength & ~NETFLAG_LENGTH_MASK;
 816                 qlength &= NETFLAG_LENGTH_MASK;
 817                 // control packets were already handled
 818                 if (!(flags & NETFLAG_CTL) && qlength == length)
 819                 {
 820                         sequence = BigLong(((int *)data)[1]);
 821                         packetsReceived++;
 822                         data += 8;
 823                         length -= 8;
 824                         if (flags & NETFLAG_UNRELIABLE)
 825                         {
 826                                 if (sequence >= conn->unreliableReceiveSequence)
 827                                 {
 828                                         if (sequence > conn->unreliableReceiveSequence)
 829                                         {
 830                                                 count = sequence - conn->unreliableReceiveSequence;
 831                                                 droppedDatagrams += count;
 832                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
 833                                         }
 834                                         conn->unreliableReceiveSequence = sequence + 1;
 835                                         conn->lastMessageTime = realtime;
 836                                         conn->timeout = realtime + net_messagetimeout.value;
 837                                         unreliableMessagesReceived++;
 838                                         if (length > 0)
 839                                         {
 840                                                 SZ_Clear(&net_message);
 841                                                 SZ_Write(&net_message, data, length);
 842                                                 MSG_BeginReading();
 843                                                 return 2;
 844                                         }
 845                                 }
 846                                 else
 847                                         Con_DPrint("Got a stale datagram\n");
 848                                 return 1;
 849                         }
 850                         else if (flags & NETFLAG_ACK)
 851                         {
 852                                 if (sequence == (conn->sendSequence - 1))
 853                                 {
 854                                         if (sequence == conn->ackSequence)
 855                                         {
 856                                                 conn->ackSequence++;
 857                                                 if (conn->ackSequence != conn->sendSequence)
 858                                                         Con_DPrint("ack sequencing error\n");
 859                                                 conn->lastMessageTime = realtime;
 860                                                 conn->timeout = realtime + net_messagetimeout.value;
 861                                                 conn->sendMessageLength -= MAX_PACKETFRAGMENT;
 862                                                 if (conn->sendMessageLength > 0)
 863                                                 {
 864                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
 865                                                         conn->sendNext = true;
 866                                                         NetConn_SendMessageNext(conn);
 867                                                 }
 868                                                 else
 869                                                 {
 870                                                         conn->sendMessageLength = 0;
 871                                                         conn->canSend = true;
 872                                                 }
 873                                         }
 874                                         else
 875                                                 Con_DPrint("Duplicate ACK received\n");
 876                                 }
 877                                 else
 878                                         Con_DPrint("Stale ACK received\n");
 879                                 return 1;
 880                         }
 881                         else if (flags & NETFLAG_DATA)
 882                         {
 883                                 unsigned int temppacket[2];
 884                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
 885                                 temppacket[1] = BigLong(sequence);
 886                                 NetConn_Write(conn->mysocket, (unsigned char *)temppacket, 8, &conn->peeraddress);
 887                                 if (sequence == conn->receiveSequence)
 888                                 {
 889                                         conn->lastMessageTime = realtime;
 890                                         conn->timeout = realtime + net_messagetimeout.value;
 891                                         conn->receiveSequence++;
 892                                         if( conn->receiveMessageLength + length <= (int)sizeof( conn->receiveMessage ) ) {
 893                                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
 894                                                 conn->receiveMessageLength += length;
 895                                         } else {
 896                                                 Con_Printf( "Reliable message (seq: %i) too big for message buffer!\n"
 897                                                                         "Dropping the message!\n", sequence );
 898                                                 conn->receiveMessageLength = 0;
 899                                                 return 1;
 900                                         }
 901                                         if (flags & NETFLAG_EOM)
 902                                         {
 903                                                 reliableMessagesReceived++;
 904                                                 length = conn->receiveMessageLength;
 905                                                 conn->receiveMessageLength = 0;
 906                                                 if (length > 0)
 907                                                 {
 908                                                         SZ_Clear(&net_message);
 909                                                         SZ_Write(&net_message, conn->receiveMessage, length);
 910                                                         MSG_BeginReading();
 911                                                         return 2;
 912                                                 }
 913                                         }
 914                                 }
 915                                 else
 916                                         receivedDuplicateCount++;
 917                                 return 1;
 918                         }
 919                 }
 920         }
 921         return 0;
 922 }
 923
 924 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 925 {
 926         cls.connect_trying = false;
 927         M_Update_Return_Reason("");
 928         // the connection request succeeded, stop current connection and set up a new connection
 929         CL_Disconnect();
 930         // if we're connecting to a remote server, shut down any local server
 931         if (LHNETADDRESS_GetAddressType(peeraddress) != LHNETADDRESSTYPE_LOOP && sv.active)
 932                 Host_ShutdownServer (false);
 933         // allocate a net connection to keep track of things
 934         cls.netcon = NetConn_Open(mysocket, peeraddress);
 935         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
 936         key_dest = key_game;
 937         m_state = m_none;
 938         cls.demonum = -1;                       // not in the demo loop now
 939         cls.state = ca_connected;
 940         cls.signon = 0;                         // need all the signon messages before playing
 941 }
 942
 943 int NetConn_IsLocalGame(void)
 944 {
 945         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
 946                 return true;
 947         return false;
 948 }
 949
 950 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
 951 {
 952         int ret, c, control;
 953         const char *s;
 954         char *string, addressstring2[128], cname[128], ipstring[32];
 955         char stringbuf[16384];
 956
 957         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 958         {
 959                 // received a command string - strip off the packaging and put it
 960                 // into our string buffer with NULL termination
 961                 data += 4;
 962                 length -= 4;
 963                 length = min(length, (int)sizeof(stringbuf) - 1);
 964                 memcpy(stringbuf, data, length);
 965                 stringbuf[length] = 0;
 966                 string = stringbuf;
 967
 968                 if (developer.integer)
 969                 {
 970                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 971                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
 972                         Com_HexDumpToConsole(data, length);
 973                 }
 974
 975                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
 976                 {
 977                         char protocolnames[1400];
 978                         Protocol_Names(protocolnames, sizeof(protocolnames));
 979                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 980                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
 981                         M_Update_Return_Reason("Got challenge response");
 982                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\protocols\\%s\\challenge\\%s", protocolnames, string + 10), peeraddress);
 983                         return true;
 984                 }
 985                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
 986                 {
 987                         M_Update_Return_Reason("Accepted");
 988                         NetConn_ConnectionEstablished(mysocket, peeraddress);
 989                         return true;
 990                 }
 991                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
 992                 {
 993                         char rejectreason[32];
 994                         cls.connect_trying = false;
 995                         string += 7;
 996                         length = max(length - 7, (int)sizeof(rejectreason) - 1);
 997                         memcpy(rejectreason, string, length);
 998                         rejectreason[length] = 0;
 999                         M_Update_Return_Reason(rejectreason);
1000                         return true;
1001                 }
1002                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1003                 {
1004                         serverlist_info_t *info;
1005                         int n;
1006                         double pingtime;
1007
1008                         string += 13;
1009                         // serverlist only uses text addresses
1010                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
1011                         // search the cache for this server and update it
1012                         for( n = 0; n < serverlist_cachecount; n++ )
1013                                 if( !strcmp( cname, serverlist_cache[n].info.cname ) )
1014                                         break;
1015                         if( n == serverlist_cachecount ) {
1016                                 // LAN search doesnt require an answer from the master server so we wont
1017                                 // know the ping nor will it be initialized already...
1018
1019                                 // find a slot
1020                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1021                                         return true;
1022
1023                                 memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1024                                 // store the data the engine cares about (address and ping)
1025                                 strlcpy (serverlist_cache[serverlist_cachecount].info.cname, cname, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1026                                 serverlist_cache[serverlist_cachecount].info.ping = 100000;
1027                                 serverlist_cache[serverlist_cachecount].querytime = realtime;
1028                                 // if not in the slist menu we should print the server to console
1029                                 if (serverlist_consoleoutput) {
1030                                         Con_Printf("querying %s\n", ipstring);
1031                                 }
1032
1033                                 ++serverlist_cachecount;
1034                         }
1035
1036                         info = &serverlist_cache[n].info;
1037                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));else info->game[0] = 0;
1038                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1039                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1040                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1041                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);else info->protocol = -1;
1042                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);else info->numplayers = 0;
1043                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1044
1045                         if (info->ping == 100000)
1046                                         serverreplycount++;
1047
1048                         pingtime = (int)((realtime - serverlist_cache[n].querytime) * 1000.0);
1049                         pingtime = bound(0, pingtime, 9999);
1050                         // update the ping
1051                         info->ping = pingtime;
1052
1053                         // legacy/old stuff move it to the menu ASAP
1054
1055                         // build description strings for the things users care about
1056                         dpsnprintf(serverlist_cache[n].line1, sizeof(serverlist_cache[n].line1), "%c%c%5d%c%c%c%3u/%3u %-65.65s", STRING_COLOR_TAG, pingtime >= 300 ? '1' : (pingtime >= 200 ? '3' : '7'), (int)pingtime, STRING_COLOR_TAG, STRING_COLOR_DEFAULT + '0', info->protocol != NET_PROTOCOL_VERSION ? '*' : ' ', info->numplayers, info->maxplayers, info->name);
1057                         dpsnprintf(serverlist_cache[n].line2, sizeof(serverlist_cache[n].line2), "%-21.21s %-19.19s %-17.17s %-20.20s", info->cname, info->game, info->mod, info->map);
1058                         if( serverlist_cache[n].query == SQS_QUERIED ) {
1059                                 ServerList_ViewList_Remove( &serverlist_cache[n] );
1060                         }
1061                         // if not in the slist menu we should print the server to console (if wanted)
1062                         else if( serverlist_consoleoutput )
1063                                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1064                         // and finally, update the view set
1065                         ServerList_ViewList_Insert( &serverlist_cache[n] );
1066                         serverlist_cache[n].query = SQS_QUERIED;
1067
1068                         return true;
1069                 }
1070                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1071                 {
1072                         // Extract the IP addresses
1073                         data += 18;
1074                         length -= 18;
1075                         masterreplycount++;
1076                         if (serverlist_consoleoutput)
1077                                 Con_Print("received server list...\n");
1078                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
1079                         {
1080                                 int n;
1081
1082                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
1083                                 if (developer.integer)
1084                                         Con_Printf("Requesting info from server %s\n", ipstring);
1085                                 // ignore the rest of the message if the serverlist is full
1086                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1087                                         break;
1088                                 // also ignore it if we have already queried it (other master server response)
1089                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1090                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1091                                                 break;
1092                                 if( n >= serverlist_cachecount )
1093                                 {
1094                                         serverquerycount++;
1095
1096                                         memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1097                                         // store the data the engine cares about (address and ping)
1098                                         strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1099                                         serverlist_cache[serverlist_cachecount].info.ping = 100000;
1100                                         serverlist_cache[serverlist_cachecount].query = SQS_QUERYING;
1101
1102                                         ++serverlist_cachecount;
1103                                 }
1104
1105                                 // move on to next address in packet
1106                                 data += 7;
1107                                 length -= 7;
1108                         }
1109                         // begin or resume serverlist queries
1110                         serverlist_querysleep = false;
1111                         return true;
1112                 }
1113                 /*
1114                 if (!strncmp(string, "ping", 4))
1115                 {
1116                         if (developer.integer)
1117                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1118                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1119                         return true;
1120                 }
1121                 if (!strncmp(string, "ack", 3))
1122                         return true;
1123                 */
1124                 // we may not have liked the packet, but it was a command packet, so
1125                 // we're done processing this packet now
1126                 return true;
1127         }
1128         // netquake control packets, supported for compatibility only
1129         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1130         {
1131                 c = data[4];
1132                 data += 5;
1133                 length -= 5;
1134                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1135                 switch (c)
1136                 {
1137                 case CCREP_ACCEPT:
1138                         if (developer.integer)
1139                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
1140                         if (cls.connect_trying)
1141                         {
1142                                 lhnetaddress_t clientportaddress;
1143                                 clientportaddress = *peeraddress;
1144                                 if (length >= 4)
1145                                 {
1146                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
1147                                         data += 4;
1148                                         length -= 4;
1149                                         LHNETADDRESS_SetPort(&clientportaddress, port);
1150                                 }
1151                                 M_Update_Return_Reason("Accepted");
1152                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress);
1153                         }
1154                         break;
1155                 case CCREP_REJECT:
1156                         if (developer.integer)
1157                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1158                         cls.connect_trying = false;
1159                         M_Update_Return_Reason((char *)data);
1160                         break;
1161 #if 0
1162                 case CCREP_SERVER_INFO:
1163                         if (developer.integer)
1164                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1165                         if (cls.state != ca_dedicated)
1166                         {
1167                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
1168                                 // string we just ignore it and keep the real address
1169                                 MSG_ReadString();
1170                                 // serverlist only uses text addresses
1171                                 cname = UDP_AddrToString(readaddr);
1172                                 // search the cache for this server
1173                                 for (n = 0; n < hostCacheCount; n++)
1174                                         if (!strcmp(cname, serverlist[n].cname))
1175                                                 break;
1176                                 // add it
1177                                 if (n == hostCacheCount && hostCacheCount < SERVERLISTSIZE)
1178                                 {
1179                                         hostCacheCount++;
1180                                         memset(&serverlist[n], 0, sizeof(serverlist[n]));
1181                                         strlcpy (serverlist[n].name, MSG_ReadString(), sizeof (serverlist[n].name));
1182                                         strlcpy (serverlist[n].map, MSG_ReadString(), sizeof (serverlist[n].map));
1183                                         serverlist[n].users = MSG_ReadByte();
1184                                         serverlist[n].maxusers = MSG_ReadByte();
1185                                         c = MSG_ReadByte();
1186                                         if (c != NET_PROTOCOL_VERSION)
1187                                         {
1188                                                 strlcpy (serverlist[n].cname, serverlist[n].name, sizeof (serverlist[n].cname));
1189                                                 strcpy(serverlist[n].name, "*");
1190                                                 strlcat (serverlist[n].name, serverlist[n].cname, sizeof(serverlist[n].name));
1191                                         }
1192                                         strlcpy (serverlist[n].cname, cname, sizeof (serverlist[n].cname));
1193                                 }
1194                         }
1195                         break;
1196                 case CCREP_PLAYER_INFO:
1197                         // we got a CCREP_PLAYER_INFO??
1198                         //if (developer.integer)
1199                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1200                         break;
1201                 case CCREP_RULE_INFO:
1202                         // we got a CCREP_RULE_INFO??
1203                         //if (developer.integer)
1204                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1205                         break;
1206 #endif
1207                 default:
1208                         break;
1209                 }
1210                 // we may not have liked the packet, but it was a valid control
1211                 // packet, so we're done processing this packet now
1212                 return true;
1213         }
1214         ret = 0;
1215         if (length >= (int)NET_HEADERSIZE && cls.netcon && mysocket == cls.netcon->mysocket && !LHNETADDRESS_Compare(&cls.netcon->peeraddress, peeraddress) && (ret = NetConn_ReceivedMessage(cls.netcon, data, length)) == 2)
1216                 CL_ParseServerMessage();
1217         return ret;
1218 }
1219
1220 void NetConn_QueryQueueFrame(void)
1221 {
1222         int index;
1223         int queries;
1224         int maxqueries;
1225         double timeouttime;
1226         static double querycounter = 0;
1227
1228         if (serverlist_querysleep)
1229                 return;
1230
1231         // each time querycounter reaches 1.0 issue a query
1232         querycounter += host_realframetime * net_slist_queriespersecond.value;
1233         maxqueries = (int)querycounter;
1234         maxqueries = bound(0, maxqueries, net_slist_queriesperframe.integer);
1235         querycounter -= maxqueries;
1236
1237         if( maxqueries == 0 ) {
1238                 return;
1239         }
1240
1241         // scan serverlist and issue queries as needed
1242     serverlist_querysleep = true;
1243
1244         timeouttime = realtime - net_slist_timeout.value;
1245         for( index = 0, queries = 0 ; index < serverlist_cachecount && queries < maxqueries ; index++ )
1246         {
1247                 serverlist_entry_t *entry = &serverlist_cache[ index ];
1248                 if( entry->query != SQS_QUERYING )
1249                 {
1250                         continue;
1251                 }
1252
1253         serverlist_querysleep = false;
1254                 if( entry->querycounter != 0 && entry->querytime > timeouttime )
1255                 {
1256                         continue;
1257                 }
1258
1259                 if( entry->querycounter != (unsigned) net_slist_maxtries.integer )
1260                 {
1261                         lhnetaddress_t address;
1262                         int socket;
1263
1264                         LHNETADDRESS_FromString(&address, entry->info.cname, 0);
1265                         for (socket = 0; socket < cl_numsockets ; socket++) {
1266                                 NetConn_WriteString(cl_sockets[socket], "\377\377\377\377getinfo", &address);
1267                         }
1268
1269                         entry->querytime = realtime;
1270                         entry->querycounter++;
1271
1272                         // if not in the slist menu we should print the server to console
1273                         if (serverlist_consoleoutput)
1274                                 Con_Printf("querying %25s (%i. try)\n", entry->info.cname, entry->querycounter);
1275
1276                         queries++;
1277                 }
1278                 else
1279                 {
1280                         entry->query = SQS_TIMEDOUT;
1281                 }
1282         }
1283 }
1284
1285 void NetConn_ClientFrame(void)
1286 {
1287         int i, length;
1288         lhnetaddress_t peeraddress;
1289         netconn_t *conn;
1290         NetConn_UpdateServerStuff();
1291         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
1292         {
1293                 if (cls.connect_remainingtries == 0)
1294                         M_Update_Return_Reason("Connect: Waiting 10 seconds for reply");
1295                 cls.connect_nextsendtime = realtime + 1;
1296                 cls.connect_remainingtries--;
1297                 if (cls.connect_remainingtries <= -10)
1298                 {
1299                         cls.connect_trying = false;
1300                         M_Update_Return_Reason("Connect: Failed");
1301                         return;
1302                 }
1303                 // try challenge first (newer server)
1304                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
1305                 // then try netquake as a fallback (old server, or netquake)
1306                 SZ_Clear(&net_message);
1307                 // save space for the header, filled in later
1308                 MSG_WriteLong(&net_message, 0);
1309                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
1310                 MSG_WriteString(&net_message, "QUAKE");
1311                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1312                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1313                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
1314                 SZ_Clear(&net_message);
1315         }
1316         for (i = 0;i < cl_numsockets;i++) {
1317                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0) {
1318                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
1319                 }
1320         }
1321         NetConn_QueryQueueFrame();
1322         if (cls.netcon && realtime > cls.netcon->timeout)
1323         {
1324                 Con_Print("Connection timed out\n");
1325                 CL_Disconnect();
1326                 Host_ShutdownServer (false);
1327         }
1328         for (conn = netconn_list;conn;conn = conn->next)
1329                 NetConn_ReSendMessage(conn);
1330 }
1331
1332 #define MAX_CHALLENGES 128
1333 struct challenge_s
1334 {
1335         lhnetaddress_t address;
1336         double time;
1337         char string[12];
1338 }
1339 challenge[MAX_CHALLENGES];
1340
1341 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
1342 {
1343         int i;
1344         char c;
1345         for (i = 0;i < bufferlength - 1;i++)
1346         {
1347                 do
1348                 {
1349                         c = rand () % (127 - 33) + 33;
1350                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
1351                 buffer[i] = c;
1352         }
1353         buffer[i] = 0;
1354 }
1355
1356 static qboolean NetConn_BuildStatusResponse(const char* challenge, char* out_msg, size_t out_size, qboolean fullstatus)
1357 {
1358         unsigned int nb_clients = 0, i;
1359         int length;
1360
1361         // How many clients are there?
1362         for (i = 0;i < (unsigned int)svs.maxclients;i++)
1363                 if (svs.clients[i].active)
1364                         nb_clients++;
1365
1366         // TODO: we should add more information for the full status string
1367         length = dpsnprintf(out_msg, out_size,
1368                                                 "\377\377\377\377%s\x0A"
1369                                                 "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
1370                                                 "\\clients\\%d\\mapname\\%s\\hostname\\%s""\\protocol\\%d"
1371                                                 "%s%s"
1372                                                 "%s",
1373                                                 fullstatus ? "statusResponse" : "infoResponse",
1374                                                 gamename, com_modname, svs.maxclients,
1375                                                 nb_clients, sv.name, hostname.string, NET_PROTOCOL_VERSION,
1376                                                 challenge ? "\\challenge\\" : "", challenge ? challenge : "",
1377                                                 fullstatus ? "\n" : "");
1378
1379         // Make sure it fits in the buffer
1380         if (length < 0)
1381                 return false;
1382
1383         if (fullstatus)
1384         {
1385                 char *ptr;
1386                 int left;
1387
1388                 ptr = out_msg + length;
1389                 left = (int)out_size - length;
1390
1391                 for (i = 0;i < (unsigned int)svs.maxclients;i++)
1392                 {
1393                         client_t *cl = &svs.clients[i];
1394                         if (cl->active)
1395                         {
1396                                 int nameind, cleanind;
1397                                 char curchar;
1398                                 char cleanname [sizeof(cl->name)];
1399
1400                                 // Remove all characters '"' and '\' in the player name
1401                                 nameind = 0;
1402                                 cleanind = 0;
1403                                 do
1404                                 {
1405                                         curchar = cl->name[nameind++];
1406                                         if (curchar != '"' && curchar != '\\')
1407                                         {
1408                                                 cleanname[cleanind++] = curchar;
1409                                                 if (cleanind == sizeof(cleanname) - 1)
1410                                                         break;
1411                                         }
1412                                 } while (curchar != '\0');
1413
1414                                 length = dpsnprintf(ptr, left, "%d %d \"%s\"\n",
1415                                                                         cl->frags,
1416                                                                         (int)(cl->ping * 1000.0f),
1417                                                                         cleanname);
1418                                 if(length < 0)
1419                                         return false;
1420                                 left -= length;
1421                                 ptr += length;
1422                         }
1423                 }
1424         }
1425
1426         return true;
1427 }
1428
1429 extern void SV_SendServerinfo (client_t *client);
1430 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1431 {
1432         int i, ret, clientnum, best;
1433         double besttime;
1434         client_t *client;
1435         netconn_t *conn;
1436         char *s, *string, response[512], addressstring2[128], stringbuf[16384];
1437
1438         if (sv.active)
1439         {
1440                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1441                 {
1442                         // received a command string - strip off the packaging and put it
1443                         // into our string buffer with NULL termination
1444                         data += 4;
1445                         length -= 4;
1446                         length = min(length, (int)sizeof(stringbuf) - 1);
1447                         memcpy(stringbuf, data, length);
1448                         stringbuf[length] = 0;
1449                         string = stringbuf;
1450
1451                         if (developer.integer)
1452                         {
1453                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1454                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1455                                 Com_HexDumpToConsole(data, length);
1456                         }
1457
1458                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
1459                         {
1460                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1461                                 {
1462                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1463                                                 break;
1464                                         if (besttime > challenge[i].time)
1465                                                 besttime = challenge[best = i].time;
1466                                 }
1467                                 // if we did not find an exact match, choose the oldest and
1468                                 // update address and string
1469                                 if (i == MAX_CHALLENGES)
1470                                 {
1471                                         i = best;
1472                                         challenge[i].address = *peeraddress;
1473                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1474                                 }
1475                                 challenge[i].time = realtime;
1476                                 // send the challenge
1477                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1478                                 return true;
1479                         }
1480                         if (length > 8 && !memcmp(string, "connect\\", 8))
1481                         {
1482                                 string += 7;
1483                                 length -= 7;
1484                                 if ((s = SearchInfostring(string, "challenge")))
1485                                 {
1486                                         // validate the challenge
1487                                         for (i = 0;i < MAX_CHALLENGES;i++)
1488                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1489                                                         break;
1490                                         if (i < MAX_CHALLENGES)
1491                                         {
1492                                                 // check engine protocol
1493                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1494                                                 {
1495                                                         if (developer.integer)
1496                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1497                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1498                                                 }
1499                                                 else
1500                                                 {
1501                                                         // see if this is a duplicate connection request
1502                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1503                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1504                                                                         break;
1505                                                         if (clientnum < svs.maxclients && realtime - client->connecttime < net_messagerejointimeout.value)
1506                                                         {
1507                                                                 // client is still trying to connect,
1508                                                                 // so we send a duplicate reply
1509                                                                 if (developer.integer)
1510                                                                         Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1511                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1512                                                         }
1513 #if 0
1514                                                         else if (clientnum < svs.maxclients)
1515                                                         {
1516                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1517                                                                 {
1518                                                                         // client crashed and is coming back, keep their stuff intact
1519                                                                         SV_SendServerinfo(client);
1520                                                                         //host_client = client;
1521                                                                         //SV_DropClient (true);
1522                                                                 }
1523                                                                 // else ignore them
1524                                                         }
1525 #endif
1526                                                         else
1527                                                         {
1528                                                                 // this is a new client, find a slot
1529                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1530                                                                         if (!client->active)
1531                                                                                 break;
1532                                                                 if (clientnum < svs.maxclients)
1533                                                                 {
1534                                                                         // prepare the client struct
1535                                                                         if ((conn = NetConn_Open(mysocket, peeraddress)))
1536                                                                         {
1537                                                                                 // allocated connection
1538                                                                                 LHNETADDRESS_ToString(peeraddress, conn->address, sizeof(conn->address), true);
1539                                                                                 if (developer.integer)
1540                                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1541                                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1542                                                                                 // now set up the client
1543                                                                                 SV_ConnectClient(clientnum, conn);
1544                                                                                 NetConn_Heartbeat(1);
1545                                                                         }
1546                                                                 }
1547                                                                 else
1548                                                                 {
1549                                                                         // server is full
1550                                                                         if (developer.integer)
1551                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1552                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1553                                                                 }
1554                                                         }
1555                                                 }
1556                                         }
1557                                 }
1558                                 return true;
1559                         }
1560                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1561                         {
1562                                 const char *challenge = NULL;
1563
1564                                 // If there was a challenge in the getinfo message
1565                                 if (length > 8 && string[7] == ' ')
1566                                         challenge = string + 8;
1567
1568                                 if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), false))
1569                                 {
1570                                         if (developer.integer)
1571                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1572                                         NetConn_WriteString(mysocket, response, peeraddress);
1573                                 }
1574                                 return true;
1575                         }
1576                         if (length >= 9 && !memcmp(string, "getstatus", 9))
1577                         {
1578                                 const char *challenge = NULL;
1579
1580                                 // If there was a challenge in the getinfo message
1581                                 if (length > 10 && string[9] == ' ')
1582                                         challenge = string + 10;
1583
1584                                 if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), true))
1585                                 {
1586                                         if (developer.integer)
1587                                                 Con_Printf("Sending reply to client %s - %s\n", addressstring2, response);
1588                                         NetConn_WriteString(mysocket, response, peeraddress);
1589                                 }
1590                                 return true;
1591                         }
1592                         /*
1593                         if (!strncmp(string, "ping", 4))
1594                         {
1595                                 if (developer.integer)
1596                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1597                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1598                                 return true;
1599                         }
1600                         if (!strncmp(string, "ack", 3))
1601                                 return true;
1602                         */
1603                         // we may not have liked the packet, but it was a command packet, so
1604                         // we're done processing this packet now
1605                         return true;
1606                 }
1607                 // LordHavoc: disabled netquake control packet support in server
1608 #if 0
1609                 {
1610                         int c, control;
1611                         // netquake control packets, supported for compatibility only
1612                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1613                         {
1614                                 c = data[4];
1615                                 data += 5;
1616                                 length -= 5;
1617                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1618                                 switch (c)
1619                                 {
1620                                 case CCREQ_CONNECT:
1621                                         //if (developer.integer)
1622                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1623                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
1624                                         {
1625                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1626                                                 {
1627                                                         if (developer.integer)
1628                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1629                                                         SZ_Clear(&net_message);
1630                                                         // save space for the header, filled in later
1631                                                         MSG_WriteLong(&net_message, 0);
1632                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1633                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
1634                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1635                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1636                                                         SZ_Clear(&net_message);
1637                                                 }
1638                                                 else
1639                                                 {
1640                                                         // see if this is a duplicate connection request
1641                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1642                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1643                                                                         break;
1644                                                         if (clientnum < svs.maxclients)
1645                                                         {
1646                                                                 // duplicate connection request
1647                                                                 if (realtime - client->connecttime < 2.0)
1648                                                                 {
1649                                                                         // client is still trying to connect,
1650                                                                         // so we send a duplicate reply
1651                                                                         if (developer.integer)
1652                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1653                                                                         SZ_Clear(&net_message);
1654                                                                         // save space for the header, filled in later
1655                                                                         MSG_WriteLong(&net_message, 0);
1656                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1657                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1658                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1659                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1660                                                                         SZ_Clear(&net_message);
1661                                                                 }
1662 #if 0
1663                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1664                                                                 {
1665                                                                         SV_SendServerinfo(client);
1666                                                                         // the old client hasn't sent us anything
1667                                                                         // in quite a while, so kick off and let
1668                                                                         // the retry take care of it...
1669                                                                         //host_client = client;
1670                                                                         //SV_DropClient (true);
1671                                                                 }
1672 #endif
1673                                                         }
1674                                                         else
1675                                                         {
1676                                                                 // this is a new client, find a slot
1677                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1678                                                                         if (!client->active)
1679                                                                                 break;
1680                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
1681                                                                 {
1682                                                                         // connect to the client
1683                                                                         // everything is allocated, just fill in the details
1684                                                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
1685                                                                         if (developer.integer)
1686                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
1687                                                                         // send back the info about the server connection
1688                                                                         SZ_Clear(&net_message);
1689                                                                         // save space for the header, filled in later
1690                                                                         MSG_WriteLong(&net_message, 0);
1691                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1692                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
1693                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1694                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1695                                                                         SZ_Clear(&net_message);
1696                                                                         // now set up the client struct
1697                                                                         SV_ConnectClient(clientnum, conn);
1698                                                                         NetConn_Heartbeat(1);
1699                                                                 }
1700                                                                 else
1701                                                                 {
1702                                                                         //if (developer.integer)
1703                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
1704                                                                         // no room; try to let player know
1705                                                                         SZ_Clear(&net_message);
1706                                                                         // save space for the header, filled in later
1707                                                                         MSG_WriteLong(&net_message, 0);
1708                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1709                                                                         MSG_WriteString(&net_message, "Server is full.\n");
1710                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1711                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1712                                                                         SZ_Clear(&net_message);
1713                                                                 }
1714                                                         }
1715                                                 }
1716                                         }
1717                                         break;
1718 #if 0
1719                                 case CCREQ_SERVER_INFO:
1720                                         if (developer.integer)
1721                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
1722                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
1723                                         {
1724                                                 if (developer.integer)
1725                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
1726                                                 SZ_Clear(&net_message);
1727                                                 // save space for the header, filled in later
1728                                                 MSG_WriteLong(&net_message, 0);
1729                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1730                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1731                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1732                                                 MSG_WriteString(&net_message, hostname.string);
1733                                                 MSG_WriteString(&net_message, sv.name);
1734                                                 MSG_WriteByte(&net_message, net_activeconnections);
1735                                                 MSG_WriteByte(&net_message, svs.maxclients);
1736                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1737                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1738                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1739                                                 SZ_Clear(&net_message);
1740                                         }
1741                                         break;
1742                                 case CCREQ_PLAYER_INFO:
1743                                         if (developer.integer)
1744                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1745                                         if (sv.active)
1746                                         {
1747                                                 int playerNumber, activeNumber, clientNumber;
1748                                                 client_t *client;
1749
1750                                                 playerNumber = MSG_ReadByte();
1751                                                 activeNumber = -1;
1752                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1753                                                         if (client->active && ++activeNumber == playerNumber)
1754                                                                 break;
1755                                                 if (clientNumber != svs.maxclients)
1756                                                 {
1757                                                         SZ_Clear(&net_message);
1758                                                         // save space for the header, filled in later
1759                                                         MSG_WriteLong(&net_message, 0);
1760                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1761                                                         MSG_WriteByte(&net_message, playerNumber);
1762                                                         MSG_WriteString(&net_message, client->name);
1763                                                         MSG_WriteLong(&net_message, client->colors);
1764                                                         MSG_WriteLong(&net_message, (int)client->edict->fields.server->frags);
1765                                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
1766                                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
1767                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1768                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1769                                                         SZ_Clear(&net_message);
1770                                                 }
1771                                         }
1772                                         break;
1773                                 case CCREQ_RULE_INFO:
1774                                         if (developer.integer)
1775                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1776                                         if (sv.active)
1777                                         {
1778                                                 char *prevCvarName;
1779                                                 cvar_t *var;
1780
1781                                                 // find the search start location
1782                                                 prevCvarName = MSG_ReadString();
1783                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1784
1785                                                 // send the response
1786                                                 SZ_Clear(&net_message);
1787                                                 // save space for the header, filled in later
1788                                                 MSG_WriteLong(&net_message, 0);
1789                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1790                                                 if (var)
1791                                                 {
1792                                                         MSG_WriteString(&net_message, var->name);
1793                                                         MSG_WriteString(&net_message, var->string);
1794                                                 }
1795                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1796                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1797                                                 SZ_Clear(&net_message);
1798                                         }
1799                                         break;
1800 #endif
1801                                 default:
1802                                         break;
1803                                 }
1804                                 // we may not have liked the packet, but it was a valid control
1805                                 // packet, so we're done processing this packet now
1806                                 return true;
1807                         }
1808                 }
1809 #endif
1810                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1811                 {
1812                         if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1813                         {
1814                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1815                                         SV_ReadClientMessage();
1816                                 return ret;
1817                         }
1818                 }
1819         }
1820         return 0;
1821 }
1822
1823 void NetConn_ServerFrame(void)
1824 {
1825         int i, length;
1826         lhnetaddress_t peeraddress;
1827         netconn_t *conn;
1828         NetConn_UpdateServerStuff();
1829         for (i = 0;i < sv_numsockets;i++)
1830                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1831                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1832         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1833         {
1834                 // never timeout loopback connections
1835                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
1836                 {
1837                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1838                         SV_DropClient(false);
1839                 }
1840         }
1841         for (conn = netconn_list;conn;conn = conn->next)
1842                 NetConn_ReSendMessage(conn);
1843 }
1844
1845 void NetConn_QueryMasters(void)
1846 {
1847         int i;
1848         int masternum;
1849         lhnetaddress_t masteraddress;
1850         lhnetaddress_t broadcastaddress;
1851         char request[256];
1852
1853         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
1854                 return;
1855
1856         // 26000 is the default quake server port, servers on other ports will not
1857         // be found
1858         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
1859         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
1860
1861         for (i = 0;i < cl_numsockets;i++)
1862         {
1863                 if (cl_sockets[i])
1864                 {
1865                         // search LAN for Quake servers
1866                         SZ_Clear(&net_message);
1867                         // save space for the header, filled in later
1868                         MSG_WriteLong(&net_message, 0);
1869                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1870                         MSG_WriteString(&net_message, "QUAKE");
1871                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1872                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1873                         NetConn_Write(cl_sockets[i], net_message.data, net_message.cursize, &broadcastaddress);
1874                         SZ_Clear(&net_message);
1875
1876                         // search LAN for DarkPlaces servers
1877                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377getinfo", &broadcastaddress);
1878
1879                         // build the getservers message to send to the master servers
1880                         dpsnprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1881
1882                         // search internet
1883                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1884                         {
1885                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1886                                 {
1887                                         masterquerycount++;
1888                                         NetConn_WriteString(cl_sockets[i], request, &masteraddress);
1889                                 }
1890                         }
1891                 }
1892         }
1893         if (!masterquerycount)
1894         {
1895                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
1896                 M_Update_Return_Reason("No network");
1897         }
1898 }
1899
1900 void NetConn_Heartbeat(int priority)
1901 {
1902         lhnetaddress_t masteraddress;
1903         int masternum;
1904         lhnetsocket_t *mysocket;
1905
1906         // if it's a state change (client connected), limit next heartbeat to no
1907         // more than 30 sec in the future
1908         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1909                 nextheartbeattime = realtime + 30.0;
1910
1911         // limit heartbeatperiod to 30 to 270 second range,
1912         // lower limit is to avoid abusing master servers with excess traffic,
1913         // upper limit is to avoid timing out on the master server (which uses
1914         // 300 sec timeout)
1915         if (sv_heartbeatperiod.value < 30)
1916                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1917         if (sv_heartbeatperiod.value > 270)
1918                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1919
1920         // make advertising optional and don't advertise singleplayer games, and
1921         // only send a heartbeat as often as the admin wants
1922         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1923         {
1924                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1925                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1926                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1927                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
1928         }
1929 }
1930
1931 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1932 {
1933         int i, count = 0;
1934         unsigned char sent[MAX_SCOREBOARD];
1935
1936         memset(sent, 0, sizeof(sent));
1937
1938         // simultaneously wait for the first CanSendMessage and send the message,
1939         // then wait for a second CanSendMessage (verifying it was received), or
1940         // the client drops and is no longer counted
1941         // the loop aborts when either it runs out of clients to send to, or a
1942         // timeout expires
1943         blocktime += Sys_DoubleTime();
1944         do
1945         {
1946                 count = 0;
1947                 // run a network frame to check for packets
1948                 NetConn_ClientFrame();SV_VM_Begin();NetConn_ServerFrame();SV_VM_End();
1949                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1950                 {
1951                         if (host_client->netconnection)
1952                         {
1953                                 if (NetConn_CanSendMessage(host_client->netconnection))
1954                                 {
1955                                         if (!sent[i])
1956                                                 NetConn_SendReliableMessage(host_client->netconnection, data);
1957                                         sent[i] = true;
1958                                 }
1959                                 if (!NetConn_CanSendMessage(host_client->netconnection))
1960                                         count++;
1961                         }
1962                 }
1963         }
1964         while (count && Sys_DoubleTime() < blocktime);
1965         return count;
1966 }
1967
1968 static void Net_Heartbeat_f(void)
1969 {
1970         if (sv.active)
1971                 NetConn_Heartbeat(2);
1972         else
1973                 Con_Print("No server running, can not heartbeat to master server.\n");
1974 }
1975
1976 void PrintStats(netconn_t *conn)
1977 {
1978         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1979 }
1980
1981 void Net_Stats_f(void)
1982 {
1983         netconn_t *conn;
1984         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1985         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1986         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1987         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1988         Con_Printf("packetsSent                = %i\n", packetsSent);
1989         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1990         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1991         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1992         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1993         Con_Print("connections                =\n");
1994         for (conn = netconn_list;conn;conn = conn->next)
1995                 PrintStats(conn);
1996 }
1997
1998 void Net_Slist_f(void)
1999 {
2000         ServerList_ResetMasks();
2001         serverlist_sortbyfield = SLIF_PING;
2002         serverlist_sortdescending = false;
2003     if (m_state != m_slist) {
2004                 Con_Print("Sending requests to master servers\n");
2005                 ServerList_QueryList();
2006                 serverlist_consoleoutput = true;
2007                 Con_Print("Listening for replies...\n");
2008         } else
2009                 ServerList_QueryList();
2010 }
2011
2012 void NetConn_Init(void)
2013 {
2014         int i;
2015         lhnetaddress_t tempaddress;
2016         netconn_mempool = Mem_AllocPool("network connections", 0, NULL);
2017         Cmd_AddCommand("net_stats", Net_Stats_f);
2018         Cmd_AddCommand("net_slist", Net_Slist_f);
2019         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
2020         Cvar_RegisterVariable(&net_slist_queriespersecond);
2021         Cvar_RegisterVariable(&net_slist_queriesperframe);
2022         Cvar_RegisterVariable(&net_slist_timeout);
2023         Cvar_RegisterVariable(&net_slist_maxtries);
2024         Cvar_RegisterVariable(&net_messagetimeout);
2025         Cvar_RegisterVariable(&net_messagerejointimeout);
2026         Cvar_RegisterVariable(&net_connecttimeout);
2027         Cvar_RegisterVariable(&cl_netlocalping);
2028         Cvar_RegisterVariable(&cl_netpacketloss);
2029         Cvar_RegisterVariable(&hostname);
2030         Cvar_RegisterVariable(&developer_networking);
2031         Cvar_RegisterVariable(&cl_netport);
2032         Cvar_RegisterVariable(&sv_netport);
2033         Cvar_RegisterVariable(&net_address);
2034         //Cvar_RegisterVariable(&net_address_ipv6);
2035         Cvar_RegisterVariable(&sv_public);
2036         Cvar_RegisterVariable(&sv_heartbeatperiod);
2037         for (i = 0;sv_masters[i].name;i++)
2038                 Cvar_RegisterVariable(&sv_masters[i]);
2039 // 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.
2040         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
2041         {
2042                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
2043                 {
2044                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
2045                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
2046                 }
2047                 else
2048                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
2049         }
2050 // 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
2051         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
2052         {
2053                 i = atoi(com_argv[i + 1]);
2054                 if (i >= 0 && i < 65536)
2055                 {
2056                         Con_Printf("-port option used, setting port cvar to %i\n", i);
2057                         Cvar_SetValueQuick(&sv_netport, i);
2058                 }
2059                 else
2060                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
2061         }
2062         cl_numsockets = 0;
2063         sv_numsockets = 0;
2064         net_message.data = net_message_buf;
2065         net_message.maxsize = sizeof(net_message_buf);
2066         net_message.cursize = 0;
2067         LHNET_Init();
2068 }
2069
2070 void NetConn_Shutdown(void)
2071 {
2072         NetConn_CloseClientPorts();
2073         NetConn_CloseServerPorts();
2074         LHNET_Shutdown();
2075 }
2076