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 cvar_t sv_public = {0, "sv_public", "0"};
  29 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "180"};
  30
  31 // FIXME: resolve DNS on masters whenever their value changes and cache it (to avoid major delays in active servers when they heartbeat)
  32 static cvar_t sv_masters [] =
  33 {
  34         {CVAR_SAVE, "sv_master1", ""},
  35         {CVAR_SAVE, "sv_master2", ""},
  36         {CVAR_SAVE, "sv_master3", ""},
  37         {CVAR_SAVE, "sv_master4", ""},
  38         {0, "sv_masterextra1", "69.59.212.88"}, // ghdigital.com
  39         {0, "sv_masterextra2", "66.169.205.13"}, // dpmaster.deathmask.net
  40         {0, NULL, NULL}
  41 };
  42
  43 static double nextheartbeattime = 0;
  44
  45 sizebuf_t net_message;
  46
  47 cvar_t net_messagetimeout = {0, "net_messagetimeout","300"};
  48 cvar_t net_messagerejointimeout = {0, "net_messagerejointimeout","10"};
  49 cvar_t net_connecttimeout = {0, "net_connecttimeout","10"};
  50 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED"};
  51 cvar_t developer_networking = {0, "developer_networking", "0"};
  52
  53 cvar_t cl_netlocalping = {0, "cl_netlocalping","0"};
  54 static cvar_t cl_netpacketloss = {0, "cl_netpacketloss","0"};
  55
  56
  57 /* statistic counters */
  58 static int packetsSent = 0;
  59 static int packetsReSent = 0;
  60 static int packetsReceived = 0;
  61 static int receivedDuplicateCount = 0;
  62 static int droppedDatagrams = 0;
  63
  64 static int unreliableMessagesSent = 0;
  65 static int unreliableMessagesReceived = 0;
  66 static int reliableMessagesSent = 0;
  67 static int reliableMessagesReceived = 0;
  68
  69 double masterquerytime = -1000;
  70 int masterquerycount = 0;
  71 int masterreplycount = 0;
  72 int serverquerycount = 0;
  73 int serverreplycount = 0;
  74
  75 static qbyte sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  76 static qbyte readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  77
  78 int cl_numsockets;
  79 lhnetsocket_t *cl_sockets[16];
  80 int sv_numsockets;
  81 lhnetsocket_t *sv_sockets[16];
  82
  83 netconn_t *netconn_list = NULL;
  84 mempool_t *netconn_mempool = NULL;
  85
  86 cvar_t cl_netport = {0, "cl_port", "0"};
  87 cvar_t sv_netport = {0, "port", "26000"};
  88 cvar_t net_address = {0, "net_address", "0.0.0.0"};
  89 //cvar_t net_netaddress_ipv6 = {0, "net_address_ipv6", "[0:0:0:0:0:0:0:0]"};
  90
  91 // HostCache interface
  92 hostcache_mask_t                hostcache_currentmask;
  93 hostcache_infofield_t   hostcache_sortbyfield;
  94 qboolean                                hostcache_sortdescending;
  95
  96 int                     hostcache_viewcount = 0;
  97 hostcache_t     *hostcache_viewset[HOSTCACHE_VIEWCACHESIZE];
  98
  99 int                     hostcache_cachecount;
 100 hostcache_t hostcache_cache[HOSTCACHE_TOTALSIZE];
 101
 102 qboolean        hostcache_consoleoutput;
 103
 104 // helper function to insert a value into the viewset
 105 // spare entries will be removed
 106 static void _HostCache_VS_Insert( int index, hostcache_t *entry )
 107 {
 108     int start;
 109         for( start = index, index = hostcache_viewcount; index > start; index-- )
 110                 hostcache_viewset[index] = hostcache_viewset[index - 1];
 111         if( ++hostcache_viewcount > HOSTCACHE_VIEWCACHESIZE )
 112                 hostcache_viewcount = HOSTCACHE_VIEWCACHESIZE;
 113         hostcache_viewset[start] = entry;
 114 }
 115
 116 // we suppose hostcache_viewcount to be valid, ie > 0
 117 static void _HostCache_VS_Remove( int index )
 118 {
 119         for( --hostcache_viewcount; index < hostcache_viewcount; index++ )
 120                 hostcache_viewset[index] = hostcache_viewset[index + 1];
 121 }
 122
 123 // returns true if A should be inserted before B
 124 static qboolean _HostCache_SortTest( hostcache_t *A, hostcache_t *B )
 125 {
 126         int result; // > 0 if for numbers A > B and for text if A < B
 127
 128         if( hostcache_sortbyfield == HCIF_PING )
 129                 result = A->info.ping - B->info.ping;
 130         else if( hostcache_sortbyfield == HCIF_MAXPLAYERS )
 131                 result = A->info.maxplayers - B->info.maxplayers;
 132         else if( hostcache_sortbyfield == HCIF_NUMPLAYERS )
 133                 result = A->info.numplayers - B->info.numplayers;
 134         else if( hostcache_sortbyfield == HCIF_PROTOCOL )
 135                 result = A->info.protocol - B->info.protocol;
 136         else if( hostcache_sortbyfield == HCIF_CNAME )
 137                 result = strcmp( B->info.cname, A->info.cname );
 138         else if( hostcache_sortbyfield == HCIF_GAME )
 139                 result = strcmp( B->info.game, A->info.game );
 140         else if( hostcache_sortbyfield == HCIF_MAP )
 141                 result = strcmp( B->info.map, A->info.map );
 142         else if( hostcache_sortbyfield == HCIF_MOD )
 143                 result = strcmp( B->info.mod, A->info.mod );
 144         else if( hostcache_sortbyfield == HCIF_NAME )
 145                 result = strcmp( B->info.name, A->info.name );
 146
 147         if( result > 0 && hostcache_sortdescending)
 148                 return true;
 149         return false;
 150 }
 151
 152 static qboolean _hc_testint( int A, hostcache_infofield_t op, int B )
 153 {
 154         int diff;
 155
 156         diff = A - B;
 157         switch( hostcache_currentmask.pingtest ) {
 158                         case HCMO_GREATER:
 159                                 if( !diff )
 160                                         return false;
 161                         case HCMO_GREATEREQUAL:
 162                                 if( diff < 0 )
 163                                         return false;
 164                                 break;
 165                         case HCMO_EQUAL:
 166                                 if( diff )
 167                                         return false;
 168                                 break;
 169                         case HCMO_LESS:
 170                                 if( !diff )
 171                                         return false;
 172                         case HCMO_LESSEQUAL:
 173                                 if( diff > 0 )
 174                                         return false;
 175                                 break;
 176         }
 177         return true;
 178 }
 179
 180 static qboolean _HostCache_TestMask( hostcache_info_t *info )
 181 {
 182         if( !_hc_testint( info->ping, hostcache_currentmask.pingtest, hostcache_currentmask.info.ping ) )
 183                 return false;
 184         if( !_hc_testint( info->maxplayers, hostcache_currentmask.maxplayerstest, hostcache_currentmask.info.maxplayers ) )
 185                 return false;
 186         if( !_hc_testint( info->numplayers, hostcache_currentmask.numplayerstest, hostcache_currentmask.info.numplayers ) )
 187                 return false;
 188         if( !_hc_testint( info->protocol, hostcache_currentmask.protocoltest, hostcache_currentmask.info.protocol ))
 189                 return false;
 190         if( *hostcache_currentmask.info.cname
 191                 && !strstr( info->cname, hostcache_currentmask.info.cname ) )
 192                 return false;
 193         if( *hostcache_currentmask.info.game
 194                 && !strstr( info->game, hostcache_currentmask.info.game ) )
 195                 return false;
 196         if( *hostcache_currentmask.info.mod
 197                 && !strstr( info->mod, hostcache_currentmask.info.mod ) )
 198                 return false;
 199         if( *hostcache_currentmask.info.map
 200                 && !strstr( info->map, hostcache_currentmask.info.map ) )
 201                 return false;
 202         if( *hostcache_currentmask.info.name
 203                 && !strstr( info->name, hostcache_currentmask.info.name ) )
 204                 return false;
 205         return true;
 206 }
 207
 208 static void _HostCache_Insert( hostcache_t *entry )
 209 {
 210         int start, end, size;
 211         if( hostcache_viewcount == HOSTCACHE_VIEWCACHESIZE )
 212                 return;
 213         // now check whether it passes through mask
 214         if( !_HostCache_TestMask( &entry->info ) )
 215                 return;
 216
 217         if( !hostcache_viewcount ) {
 218                 _HostCache_VS_Insert( 0, entry );
 219                 return;
 220         }
 221         // ok, insert it, we just need to find out where exactly:
 222
 223         // two special cases
 224         // check whether to insert it as new first item
 225         if( _HostCache_SortTest( entry, hostcache_viewset[0] ) ) {
 226                 _HostCache_VS_Insert( 0, entry );
 227                 return;
 228         } // check whether to insert it as new last item
 229         else if( !_HostCache_SortTest( entry, hostcache_viewset[hostcache_viewcount - 1] ) ) {
 230                 _HostCache_VS_Insert( hostcache_viewcount, entry );
 231                 return;
 232         }
 233         start = 1;
 234         end = hostcache_viewcount - 1;
 235         while( (size = start - end) > 0 )
 236                 // test the item that lies in the middle between start and end
 237                 if( _HostCache_SortTest( entry, hostcache_viewset[(start + end) / 2] ) )
 238                         // the item has to be in the upper half
 239                         end = (start + end) / 2 - 1;
 240                 else
 241                         // the item has to be in the lower half
 242                         start = (start + end) / 2 + 1;
 243         _HostCache_VS_Insert( start + 1, entry );
 244 }
 245
 246 void HostCache_RebuildViewSet(void)
 247 {
 248         int i;
 249
 250         hostcache_viewcount = 0;
 251         for( i = 0 ; i < hostcache_cachecount ; i++ )
 252                 if( hostcache_cache[i].finished )
 253                         _HostCache_Insert( &hostcache_cache[i] );
 254 }
 255
 256 void HostCache_ResetMask(void)
 257 {
 258         memset( &hostcache_currentmask, 0, sizeof( hostcache_mask_t ) );
 259 }
 260
 261
 262 void HostCache_QueryList(void)
 263 {
 264         masterquerytime = realtime;
 265         masterquerycount = 0;
 266         masterreplycount = 0;
 267         serverquerycount = 0;
 268         serverreplycount = 0;
 269         hostcache_cachecount = 0;
 270         hostcache_viewcount = 0;
 271         hostcache_consoleoutput = false;
 272         NetConn_QueryMasters();
 273 }
 274
 275 // rest
 276
 277 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
 278 {
 279         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
 280         int i;
 281         if (cl_netpacketloss.integer)
 282                 for (i = 0;i < cl_numsockets;i++)
 283                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 284                                 return 0;
 285         if (developer_networking.integer && length != 0)
 286         {
 287                 char addressstring[128], addressstring2[128];
 288                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 289                 if (length > 0)
 290                 {
 291                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 292                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
 293                         Com_HexDumpToConsole(data, length);
 294                 }
 295                 else
 296                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
 297         }
 298         return length;
 299 }
 300
 301 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 302 {
 303         int ret;
 304         int i;
 305         if (cl_netpacketloss.integer)
 306                 for (i = 0;i < cl_numsockets;i++)
 307                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 308                                 return length;
 309         ret = LHNET_Write(mysocket, data, length, peeraddress);
 310         if (developer_networking.integer)
 311         {
 312                 char addressstring[128], addressstring2[128];
 313                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 314                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 315                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 316                 Com_HexDumpToConsole(data, length);
 317         }
 318         return ret;
 319 }
 320
 321 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 322 {
 323         // note this does not include the trailing NULL because we add that in the parser
 324         return NetConn_Write(mysocket, string, strlen(string), peeraddress);
 325 }
 326
 327 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
 328 {
 329         unsigned int packetLen;
 330         unsigned int dataLen;
 331         unsigned int eom;
 332         unsigned int *header;
 333
 334 //#ifdef DEBUG
 335         if (data->cursize == 0)
 336                 Sys_Error("Datagram_SendMessage: zero length message\n");
 337
 338         if (data->cursize > (int)sizeof(conn->sendMessage))
 339                 Sys_Error("Datagram_SendMessage: message too big (%u > %u)\n", data->cursize, sizeof(conn->sendMessage));
 340
 341         if (conn->canSend == false)
 342                 Sys_Error("SendMessage: called with canSend == false\n");
 343 //#endif
 344
 345         memcpy(conn->sendMessage, data->data, data->cursize);
 346         conn->sendMessageLength = data->cursize;
 347
 348         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 349         {
 350                 dataLen = conn->sendMessageLength;
 351                 eom = NETFLAG_EOM;
 352         }
 353         else
 354         {
 355                 dataLen = MAX_PACKETFRAGMENT;
 356                 eom = 0;
 357         }
 358
 359         packetLen = NET_HEADERSIZE + dataLen;
 360
 361         header = (void *)sendbuffer;
 362         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 363         header[1] = BigLong(conn->sendSequence);
 364         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 365
 366         conn->sendSequence++;
 367         conn->canSend = false;
 368
 369         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 370                 return -1;
 371
 372         conn->lastSendTime = realtime;
 373         packetsSent++;
 374         reliableMessagesSent++;
 375         return 1;
 376 }
 377
 378 static void NetConn_SendMessageNext(netconn_t *conn)
 379 {
 380         unsigned int packetLen;
 381         unsigned int dataLen;
 382         unsigned int eom;
 383         unsigned int *header;
 384
 385         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
 386         {
 387                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 388                 {
 389                         dataLen = conn->sendMessageLength;
 390                         eom = NETFLAG_EOM;
 391                 }
 392                 else
 393                 {
 394                         dataLen = MAX_PACKETFRAGMENT;
 395                         eom = 0;
 396                 }
 397
 398                 packetLen = NET_HEADERSIZE + dataLen;
 399
 400                 header = (void *)sendbuffer;
 401                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 402                 header[1] = BigLong(conn->sendSequence);
 403                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 404
 405                 conn->sendSequence++;
 406                 conn->sendNext = false;
 407
 408                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 409                         return;
 410
 411                 conn->lastSendTime = realtime;
 412                 packetsSent++;
 413         }
 414 }
 415
 416 static void NetConn_ReSendMessage(netconn_t *conn)
 417 {
 418         unsigned int packetLen;
 419         unsigned int dataLen;
 420         unsigned int eom;
 421         unsigned int *header;
 422
 423         if (conn->sendMessageLength && !conn->canSend && (realtime - conn->lastSendTime) > 1.0)
 424         {
 425                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 426                 {
 427                         dataLen = conn->sendMessageLength;
 428                         eom = NETFLAG_EOM;
 429                 }
 430                 else
 431                 {
 432                         dataLen = MAX_PACKETFRAGMENT;
 433                         eom = 0;
 434                 }
 435
 436                 packetLen = NET_HEADERSIZE + dataLen;
 437
 438                 header = (void *)sendbuffer;
 439                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 440                 header[1] = BigLong(conn->sendSequence - 1);
 441                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 442
 443                 conn->sendNext = false;
 444
 445                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 446                         return;
 447
 448                 conn->lastSendTime = realtime;
 449                 packetsReSent++;
 450         }
 451 }
 452
 453 qboolean NetConn_CanSendMessage(netconn_t *conn)
 454 {
 455         return conn->canSend;
 456 }
 457
 458 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
 459 {
 460         int packetLen;
 461         int *header;
 462
 463         packetLen = NET_HEADERSIZE + data->cursize;
 464
 465 //#ifdef DEBUG
 466         if (data->cursize == 0)
 467                 Sys_Error("Datagram_SendUnreliableMessage: zero length message\n");
 468
 469         if (packetLen > (int)sizeof(sendbuffer))
 470                 Sys_Error("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
 471 //#endif
 472
 473         header = (void *)sendbuffer;
 474         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
 475         header[1] = BigLong(conn->unreliableSendSequence);
 476         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
 477
 478         conn->unreliableSendSequence++;
 479
 480         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 481                 return -1;
 482
 483         packetsSent++;
 484         unreliableMessagesSent++;
 485         return 1;
 486 }
 487
 488 void NetConn_CloseClientPorts(void)
 489 {
 490         for (;cl_numsockets > 0;cl_numsockets--)
 491                 if (cl_sockets[cl_numsockets - 1])
 492                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 493 }
 494
 495 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
 496 {
 497         lhnetaddress_t address;
 498         lhnetsocket_t *s;
 499         char addressstring2[1024];
 500         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 501         {
 502                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 503                 {
 504                         cl_sockets[cl_numsockets++] = s;
 505                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 506                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
 507                 }
 508                 else
 509                 {
 510                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 511                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
 512                 }
 513         }
 514         else
 515                 Con_Printf("Client unable to parse address %s\n", addressstring);
 516 }
 517
 518 void NetConn_OpenClientPorts(void)
 519 {
 520         int port;
 521         NetConn_CloseClientPorts();
 522         port = bound(0, cl_netport.integer, 65535);
 523         if (cl_netport.integer != port)
 524                 Cvar_SetValueQuick(&cl_netport, port);
 525         Con_Printf("Client using port %i\n", port);
 526         NetConn_OpenClientPort("local:2", 0);
 527         NetConn_OpenClientPort(net_address.string, port);
 528         //NetConn_OpenClientPort(net_address_ipv6.string, port);
 529 }
 530
 531 void NetConn_CloseServerPorts(void)
 532 {
 533         for (;sv_numsockets > 0;sv_numsockets--)
 534                 if (sv_sockets[sv_numsockets - 1])
 535                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 536 }
 537
 538 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
 539 {
 540         lhnetaddress_t address;
 541         lhnetsocket_t *s;
 542         char addressstring2[1024];
 543         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 544         {
 545                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 546                 {
 547                         sv_sockets[sv_numsockets++] = s;
 548                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 549                         Con_Printf("Server listening on address %s\n", addressstring2);
 550                 }
 551                 else
 552                 {
 553                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 554                         Con_Printf("Server failed to open socket on address %s\n", addressstring2);
 555                 }
 556         }
 557         else
 558                 Con_Printf("Server unable to parse address %s\n", addressstring);
 559 }
 560
 561 void NetConn_OpenServerPorts(int opennetports)
 562 {
 563         int port;
 564         NetConn_CloseServerPorts();
 565         port = bound(0, sv_netport.integer, 65535);
 566         if (port == 0)
 567                 port = 26000;
 568         Con_Printf("Server using port %i\n", port);
 569         if (sv_netport.integer != port)
 570                 Cvar_SetValueQuick(&sv_netport, port);
 571         if (cls.state != ca_dedicated)
 572                 NetConn_OpenServerPort("local:1", 0);
 573         if (opennetports)
 574         {
 575                 NetConn_OpenServerPort(net_address.string, port);
 576                 //NetConn_OpenServerPort(net_address_ipv6.string, port);
 577         }
 578         if (sv_numsockets == 0)
 579                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!\n");
 580 }
 581
 582 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 583 {
 584         int i, a = LHNETADDRESS_GetAddressType(address);
 585         for (i = 0;i < cl_numsockets;i++)
 586                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 587                         return cl_sockets[i];
 588         return NULL;
 589 }
 590
 591 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 592 {
 593         int i, a = LHNETADDRESS_GetAddressType(address);
 594         for (i = 0;i < sv_numsockets;i++)
 595                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 596                         return sv_sockets[i];
 597         return NULL;
 598 }
 599
 600 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 601 {
 602         netconn_t *conn;
 603         conn = Mem_Alloc(netconn_mempool, sizeof(*conn));
 604         conn->mysocket = mysocket;
 605         conn->peeraddress = *peeraddress;
 606         conn->canSend = true;
 607         conn->lastMessageTime = realtime;
 608         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
 609         // reduce effectiveness of connection request floods
 610         conn->timeout = realtime + net_connecttimeout.value;
 611         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
 612         conn->next = netconn_list;
 613         netconn_list = conn;
 614         return conn;
 615 }
 616
 617 void NetConn_Close(netconn_t *conn)
 618 {
 619         netconn_t *c;
 620         // remove connection from list
 621         if (conn == netconn_list)
 622                 netconn_list = conn->next;
 623         else
 624         {
 625                 for (c = netconn_list;c;c = c->next)
 626                 {
 627                         if (c->next == conn)
 628                         {
 629                                 c->next = conn->next;
 630                                 break;
 631                         }
 632                 }
 633                 // not found in list, we'll avoid crashing here...
 634                 if (!c)
 635                         return;
 636         }
 637         // free connection
 638         Mem_Free(conn);
 639 }
 640
 641 static int clientport = -1;
 642 static int clientport2 = -1;
 643 static int hostport = -1;
 644 static void NetConn_UpdateServerStuff(void)
 645 {
 646         if (cls.state != ca_dedicated)
 647         {
 648                 if (clientport2 != cl_netport.integer)
 649                 {
 650                         clientport2 = cl_netport.integer;
 651                         if (cls.state == ca_connected)
 652                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
 653                 }
 654                 if (cls.state == ca_disconnected && clientport != clientport2)
 655                 {
 656                         clientport = clientport2;
 657                         NetConn_CloseClientPorts();
 658                 }
 659                 if (cl_numsockets == 0)
 660                         NetConn_OpenClientPorts();
 661         }
 662
 663         if (hostport != sv_netport.integer)
 664         {
 665                 hostport = sv_netport.integer;
 666                 if (sv.active)
 667                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
 668         }
 669 }
 670
 671 int NetConn_ReceivedMessage(netconn_t *conn, qbyte *data, int length)
 672 {
 673         unsigned int count;
 674         unsigned int flags;
 675         unsigned int sequence;
 676
 677         if (length >= 8)
 678         {
 679                 length = BigLong(((int *)data)[0]);
 680                 flags = length & ~NETFLAG_LENGTH_MASK;
 681                 length &= NETFLAG_LENGTH_MASK;
 682                 // control packets were already handled
 683                 if (!(flags & NETFLAG_CTL))
 684                 {
 685                         sequence = BigLong(((int *)data)[1]);
 686                         packetsReceived++;
 687                         data += 8;
 688                         length -= 8;
 689                         if (flags & NETFLAG_UNRELIABLE)
 690                         {
 691                                 if (sequence >= conn->unreliableReceiveSequence)
 692                                 {
 693                                         if (sequence > conn->unreliableReceiveSequence)
 694                                         {
 695                                                 count = sequence - conn->unreliableReceiveSequence;
 696                                                 droppedDatagrams += count;
 697                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
 698                                         }
 699                                         conn->unreliableReceiveSequence = sequence + 1;
 700                                         conn->lastMessageTime = realtime;
 701                                         conn->timeout = realtime + net_messagetimeout.value;
 702                                         unreliableMessagesReceived++;
 703                                         if (length > 0)
 704                                         {
 705                                                 SZ_Clear(&net_message);
 706                                                 SZ_Write(&net_message, data, length);
 707                                                 MSG_BeginReading();
 708                                                 return 2;
 709                                         }
 710                                 }
 711                                 else
 712                                         Con_DPrint("Got a stale datagram\n");
 713                                 return 1;
 714                         }
 715                         else if (flags & NETFLAG_ACK)
 716                         {
 717                                 if (sequence == (conn->sendSequence - 1))
 718                                 {
 719                                         if (sequence == conn->ackSequence)
 720                                         {
 721                                                 conn->ackSequence++;
 722                                                 if (conn->ackSequence != conn->sendSequence)
 723                                                         Con_DPrint("ack sequencing error\n");
 724                                                 conn->lastMessageTime = realtime;
 725                                                 conn->timeout = realtime + net_messagetimeout.value;
 726                                                 conn->sendMessageLength -= MAX_PACKETFRAGMENT;
 727                                                 if (conn->sendMessageLength > 0)
 728                                                 {
 729                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
 730                                                         conn->sendNext = true;
 731                                                         NetConn_SendMessageNext(conn);
 732                                                 }
 733                                                 else
 734                                                 {
 735                                                         conn->sendMessageLength = 0;
 736                                                         conn->canSend = true;
 737                                                 }
 738                                         }
 739                                         else
 740                                                 Con_DPrint("Duplicate ACK received\n");
 741                                 }
 742                                 else
 743                                         Con_DPrint("Stale ACK received\n");
 744                                 return 1;
 745                         }
 746                         else if (flags & NETFLAG_DATA)
 747                         {
 748                                 unsigned int temppacket[2];
 749                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
 750                                 temppacket[1] = BigLong(sequence);
 751                                 NetConn_Write(conn->mysocket, (qbyte *)temppacket, 8, &conn->peeraddress);
 752                                 if (sequence == conn->receiveSequence)
 753                                 {
 754                                         conn->lastMessageTime = realtime;
 755                                         conn->timeout = realtime + net_messagetimeout.value;
 756                                         conn->receiveSequence++;
 757                                         memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
 758                                         conn->receiveMessageLength += length;
 759                                         if (flags & NETFLAG_EOM)
 760                                         {
 761                                                 reliableMessagesReceived++;
 762                                                 length = conn->receiveMessageLength;
 763                                                 conn->receiveMessageLength = 0;
 764                                                 if (length > 0)
 765                                                 {
 766                                                         SZ_Clear(&net_message);
 767                                                         SZ_Write(&net_message, conn->receiveMessage, length);
 768                                                         MSG_BeginReading();
 769                                                         return 2;
 770                                                 }
 771                                         }
 772                                 }
 773                                 else
 774                                         receivedDuplicateCount++;
 775                                 return 1;
 776                         }
 777                 }
 778         }
 779         return 0;
 780 }
 781
 782 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 783 {
 784         cls.connect_trying = false;
 785         M_Update_Return_Reason("");
 786         // the connection request succeeded, stop current connection and set up a new connection
 787         CL_Disconnect();
 788         cls.netcon = NetConn_Open(mysocket, peeraddress);
 789         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
 790         key_dest = key_game;
 791         m_state = m_none;
 792         cls.demonum = -1;                       // not in the demo loop now
 793         cls.state = ca_connected;
 794         cls.signon = 0;                         // need all the signon messages before playing
 795         CL_ClearState();
 796         SCR_BeginLoadingPlaque();
 797 }
 798
 799 int NetConn_IsLocalGame(void)
 800 {
 801         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
 802                 return true;
 803         return false;
 804 }
 805
 806 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 807 {
 808         int ret, c, control;
 809         lhnetaddress_t svaddress;
 810         const char *s;
 811         char *string, addressstring2[128], cname[128], ipstring[32];
 812         char stringbuf[16384];
 813
 814         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 815         {
 816                 // received a command string - strip off the packaging and put it
 817                 // into our string buffer with NULL termination
 818                 data += 4;
 819                 length -= 4;
 820                 length = min(length, (int)sizeof(stringbuf) - 1);
 821                 memcpy(stringbuf, data, length);
 822                 stringbuf[length] = 0;
 823                 string = stringbuf;
 824
 825                 if (developer.integer)
 826                 {
 827                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 828                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
 829                         Com_HexDumpToConsole(data, length);
 830                 }
 831
 832                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
 833                 {
 834                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 835                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
 836                         M_Update_Return_Reason("Got challenge response");
 837                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\challenge\\%s", string + 10), peeraddress);
 838                         return true;
 839                 }
 840                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
 841                 {
 842                         M_Update_Return_Reason("Accepted");
 843                         NetConn_ConnectionEstablished(mysocket, peeraddress);
 844                         return true;
 845                 }
 846                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
 847                 {
 848                         char rejectreason[32];
 849                         cls.connect_trying = false;
 850                         string += 7;
 851                         length = max(length - 7, (int)sizeof(rejectreason) - 1);
 852                         memcpy(rejectreason, string, length);
 853                         rejectreason[length] = 0;
 854                         M_Update_Return_Reason(rejectreason);
 855                         return true;
 856                 }
 857                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
 858                 {
 859                         hostcache_info_t *info;
 860                         int i, n;
 861                         double pingtime;
 862
 863                         string += 13;
 864                         // hostcache only uses text addresses
 865                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
 866                         // search the cache for this server and update it
 867                         for( n = 0; n < hostcache_cachecount; n++ ) {
 868                                 if( !strcmp( cname, hostcache_cache[n].info.cname ) )
 869                                         break;
 870                         }
 871                         if( n == hostcache_cachecount )
 872                                 return true;
 873
 874                         info = &hostcache_cache[n].info;
 875                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));else info->game[0] = 0;
 876                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
 877                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
 878                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
 879                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);else info->protocol = -1;
 880                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);else info->numplayers = 0;
 881                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
 882
 883                         if (info->ping == 100000)
 884                                         serverreplycount++;
 885
 886                         pingtime = (int)((realtime - hostcache_cache[n].querytime) * 1000.0);
 887                         pingtime = bound(0, pingtime, 9999);
 888                         // update the ping
 889                         info->ping = pingtime;
 890
 891                         // legacy/old stuff move it to the menu ASAP
 892
 893                         // build description strings for the things users care about
 894                         snprintf(hostcache_cache[n].line1, sizeof(hostcache_cache[n].line1), "%5d%c%3u/%3u %-65.65s", (int)pingtime, info->protocol != NET_PROTOCOL_VERSION ? '*' : ' ', info->numplayers, info->maxplayers, info->name);
 895                         snprintf(hostcache_cache[n].line2, sizeof(hostcache_cache[n].line2), "%-21.21s %-19.19s %-17.17s %-20.20s", info->cname, info->game, info->mod, info->map);
 896                         // if ping is especially high, display it as such
 897                         if (pingtime >= 300)
 898                         {
 899                                 // orange numbers (lower block)
 900                                 for (i = 0;i < 5;i++)
 901                                         if (hostcache_cache[n].line1[i] != ' ')
 902                                                 hostcache_cache[n].line1[i] += 128;
 903                         }
 904                         else if (pingtime >= 200)
 905                         {
 906                                 // yellow numbers (in upper block)
 907                                 for (i = 0;i < 5;i++)
 908                                         if (hostcache_cache[n].line1[i] != ' ')
 909                                                 hostcache_cache[n].line1[i] -= 30;
 910                         }
 911                         // if not in the slist menu we should print the server to console
 912                         if( hostcache_consoleoutput )
 913                                 Con_Printf("%s\n%s\n", hostcache_cache[n].line1, hostcache_cache[n].line2);
 914                         // and finally, update the view set
 915                         if( hostcache_cache[n].finished ) {
 916                 _HostCache_VS_Remove( n );
 917                                 _HostCache_Insert( &hostcache_cache[n] );
 918                         } else
 919                                 _HostCache_Insert( &hostcache_cache[n] );
 920                         hostcache_cache[n].finished = true;
 921
 922                         return true;
 923                 }
 924                 if (!strncmp(string, "getserversResponse\\", 19) && hostcache_cachecount < HOSTCACHE_TOTALSIZE)
 925                 {
 926                         // Extract the IP addresses
 927                         data += 18;
 928                         length -= 18;
 929                         masterreplycount++;
 930                         if (hostcache_consoleoutput)
 931                                 Con_Print("received server list...\n");
 932                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
 933                         {
 934                                 serverquerycount++;
 935
 936                                 snprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
 937                                 if (developer.integer)
 938                                         Con_Printf("Requesting info from server %s\n", ipstring);
 939                                 if( hostcache_cachecount == HOSTCACHE_TOTALSIZE )
 940                                                 // ignore the rest of the message since there wont magically disappear entries
 941                                                 break;
 942
 943                                 LHNETADDRESS_FromString(&svaddress, ipstring, 0);
 944                                 NetConn_WriteString(mysocket, "\377\377\377\377getinfo", &svaddress);
 945
 946                                 memset(&hostcache_cache[hostcache_cachecount], 0, sizeof(hostcache_cache[hostcache_cachecount]));
 947                                 // store the data the engine cares about (address and ping)
 948                                 strlcpy (hostcache_cache[hostcache_cachecount].info.cname, ipstring, sizeof (hostcache_cache[hostcache_cachecount].info.cname));
 949                                 hostcache_cache[hostcache_cachecount].info.ping = 100000;
 950                                 hostcache_cache[hostcache_cachecount].querytime = realtime;
 951                                 // if not in the slist menu we should print the server to console
 952                                 if (hostcache_consoleoutput)
 953                                         Con_Printf("querying %s\n", ipstring);
 954
 955                                 ++hostcache_cachecount;
 956
 957                                 // move on to next address in packet
 958                                 data += 7;
 959                                 length -= 7;
 960                         }
 961                         return true;
 962                 }
 963                 /*
 964                 if (!strncmp(string, "ping", 4))
 965                 {
 966                         if (developer.integer)
 967                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
 968                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
 969                         return true;
 970                 }
 971                 if (!strncmp(string, "ack", 3))
 972                         return true;
 973                 */
 974                 // we may not have liked the packet, but it was a command packet, so
 975                 // we're done processing this packet now
 976                 return true;
 977         }
 978         // netquake control packets, supported for compatibility only
 979         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
 980         {
 981                 c = data[4];
 982                 data += 5;
 983                 length -= 5;
 984                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 985                 switch (c)
 986                 {
 987                 case CCREP_ACCEPT:
 988                         if (developer.integer)
 989                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
 990                         if (cls.connect_trying)
 991                         {
 992                                 lhnetaddress_t clientportaddress;
 993                                 clientportaddress = *peeraddress;
 994                                 if (length >= 4)
 995                                 {
 996                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
 997                                         data += 4;
 998                                         length -= 4;
 999                                         LHNETADDRESS_SetPort(&clientportaddress, port);
1000                                 }
1001                                 M_Update_Return_Reason("Accepted");
1002                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress);
1003                         }
1004                         break;
1005                 case CCREP_REJECT:
1006                         if (developer.integer)
1007                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1008                         cls.connect_trying = false;
1009                         M_Update_Return_Reason(data);
1010                         break;
1011 #if 0
1012                 case CCREP_SERVER_INFO:
1013                         if (developer.integer)
1014                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1015                         if (cls.state != ca_dedicated)
1016                         {
1017                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
1018                                 // string we just ignore it and keep the real address
1019                                 MSG_ReadString();
1020                                 // hostcache only uses text addresses
1021                                 cname = UDP_AddrToString(readaddr);
1022                                 // search the cache for this server
1023                                 for (n = 0; n < hostCacheCount; n++)
1024                                         if (!strcmp(cname, hostcache[n].cname))
1025                                                 break;
1026                                 // add it
1027                                 if (n == hostCacheCount && hostCacheCount < HOSTCACHESIZE)
1028                                 {
1029                                         hostCacheCount++;
1030                                         memset(&hostcache[n], 0, sizeof(hostcache[n]));
1031                                         strlcpy (hostcache[n].name, MSG_ReadString(), sizeof (hostcache[n].name));
1032                                         strlcpy (hostcache[n].map, MSG_ReadString(), sizeof (hostcache[n].map));
1033                                         hostcache[n].users = MSG_ReadByte();
1034                                         hostcache[n].maxusers = MSG_ReadByte();
1035                                         c = MSG_ReadByte();
1036                                         if (c != NET_PROTOCOL_VERSION)
1037                                         {
1038                                                 strlcpy (hostcache[n].cname, hostcache[n].name, sizeof (hostcache[n].cname));
1039                                                 strcpy(hostcache[n].name, "*");
1040                                                 strlcat (hostcache[n].name, hostcache[n].cname, sizeof(hostcache[n].name));
1041                                         }
1042                                         strlcpy (hostcache[n].cname, cname, sizeof (hostcache[n].cname));
1043                                 }
1044                         }
1045                         break;
1046                 case CCREP_PLAYER_INFO:
1047                         // we got a CCREP_PLAYER_INFO??
1048                         //if (developer.integer)
1049                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1050                         break;
1051                 case CCREP_RULE_INFO:
1052                         // we got a CCREP_RULE_INFO??
1053                         //if (developer.integer)
1054                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1055                         break;
1056 #endif
1057                 default:
1058                         break;
1059                 }
1060                 // we may not have liked the packet, but it was a valid control
1061                 // packet, so we're done processing this packet now
1062                 return true;
1063         }
1064         ret = 0;
1065         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)
1066                 CL_ParseServerMessage();
1067         return ret;
1068 }
1069
1070 void NetConn_ClientFrame(void)
1071 {
1072         int i, length;
1073         lhnetaddress_t peeraddress;
1074         netconn_t *conn;
1075         NetConn_UpdateServerStuff();
1076         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
1077         {
1078                 if (cls.connect_remainingtries == 0)
1079                 {
1080                         cls.connect_trying = false;
1081                         M_Update_Return_Reason("Connect: Failed");
1082                         return;
1083                 }
1084                 cls.connect_nextsendtime = realtime + 1;
1085                 cls.connect_remainingtries--;
1086                 // try challenge first (newer server)
1087                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
1088                 // then try netquake as a fallback (old server, or netquake)
1089                 SZ_Clear(&net_message);
1090                 // save space for the header, filled in later
1091                 MSG_WriteLong(&net_message, 0);
1092                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
1093                 MSG_WriteString(&net_message, "QUAKE");
1094                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1095                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1096                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
1097                 SZ_Clear(&net_message);
1098         }
1099         for (i = 0;i < cl_numsockets;i++)
1100                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1101                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
1102         if (cls.netcon && realtime > cls.netcon->timeout)
1103         {
1104                 Con_Print("Connection timed out\n");
1105                 CL_Disconnect();
1106                 Host_ShutdownServer (false);
1107         }
1108         for (conn = netconn_list;conn;conn = conn->next)
1109                 NetConn_ReSendMessage(conn);
1110 }
1111
1112 #define MAX_CHALLENGES 128
1113 struct
1114 {
1115         lhnetaddress_t address;
1116         double time;
1117         char string[12];
1118 }
1119 challenge[MAX_CHALLENGES];
1120
1121 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
1122 {
1123         int i;
1124         char c;
1125         for (i = 0;i < bufferlength - 1;i++)
1126         {
1127                 do
1128                 {
1129                         c = rand () % (127 - 33) + 33;
1130                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
1131                 buffer[i] = c;
1132         }
1133         buffer[i] = 0;
1134 }
1135
1136 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
1137 {
1138         int i, n, ret, clientnum, responselength, best;
1139         double besttime;
1140         client_t *client;
1141         netconn_t *conn;
1142         char *s, *string, response[512], addressstring2[128], stringbuf[16384];
1143
1144         if (sv.active)
1145         {
1146                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1147                 {
1148                         // received a command string - strip off the packaging and put it
1149                         // into our string buffer with NULL termination
1150                         data += 4;
1151                         length -= 4;
1152                         length = min(length, (int)sizeof(stringbuf) - 1);
1153                         memcpy(stringbuf, data, length);
1154                         stringbuf[length] = 0;
1155                         string = stringbuf;
1156
1157                         if (developer.integer)
1158                         {
1159                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1160                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1161                                 Com_HexDumpToConsole(data, length);
1162                         }
1163
1164                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
1165                         {
1166                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1167                                 {
1168                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1169                                                 break;
1170                                         if (besttime > challenge[i].time)
1171                                                 besttime = challenge[best = i].time;
1172                                 }
1173                                 // if we did not find an exact match, choose the oldest and
1174                                 // update address and string
1175                                 if (i == MAX_CHALLENGES)
1176                                 {
1177                                         i = best;
1178                                         challenge[i].address = *peeraddress;
1179                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1180                                 }
1181                                 challenge[i].time = realtime;
1182                                 // send the challenge
1183                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1184                                 return true;
1185                         }
1186                         if (length > 8 && !memcmp(string, "connect\\", 8))
1187                         {
1188                                 string += 7;
1189                                 length -= 7;
1190                                 if ((s = SearchInfostring(string, "challenge")))
1191                                 {
1192                                         // validate the challenge
1193                                         for (i = 0;i < MAX_CHALLENGES;i++)
1194                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1195                                                         break;
1196                                         if (i < MAX_CHALLENGES)
1197                                         {
1198                                                 // check engine protocol
1199                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1200                                                 {
1201                                                         if (developer.integer)
1202                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1203                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1204                                                 }
1205                                                 else
1206                                                 {
1207                                                         // see if this is a duplicate connection request
1208                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1209                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1210                                                                         break;
1211                                                         if (clientnum < svs.maxclients)
1212                                                         {
1213                                                                 // duplicate connection request
1214                                                                 if (realtime - client->connecttime < 2.0)
1215                                                                 {
1216                                                                         // client is still trying to connect,
1217                                                                         // so we send a duplicate reply
1218                                                                         if (developer.integer)
1219                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1220                                                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1221                                                                 }
1222                                                                 // only kick if old connection seems dead
1223                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1224                                                                 {
1225                                                                         // kick off connection and await retry
1226                                                                         client->deadsocket = true;
1227                                                                 }
1228                                                         }
1229                                                         else
1230                                                         {
1231                                                                 // this is a new client, find a slot
1232                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1233                                                                         if (!client->active)
1234                                                                                 break;
1235                                                                 if (clientnum < svs.maxclients)
1236                                                                 {
1237                                                                         // prepare the client struct
1238                                                                         if ((conn = NetConn_Open(mysocket, peeraddress)))
1239                                                                         {
1240                                                                                 // allocated connection
1241                                                                                 LHNETADDRESS_ToString(peeraddress, conn->address, sizeof(conn->address), true);
1242                                                                                 if (developer.integer)
1243                                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1244                                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1245                                                                                 // now set up the client
1246                                                                                 SV_ConnectClient(clientnum, conn);
1247                                                                                 NetConn_Heartbeat(1);
1248                                                                         }
1249                                                                 }
1250                                                                 else
1251                                                                 {
1252                                                                         // server is full
1253                                                                         if (developer.integer)
1254                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1255                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1256                                                                 }
1257                                                         }
1258                                                 }
1259                                         }
1260                                 }
1261                                 return true;
1262                         }
1263                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1264                         {
1265                                 const char *challenge = NULL;
1266                                 // If there was a challenge in the getinfo message
1267                                 if (length > 8 && string[7] == ' ')
1268                                         challenge = string + 8;
1269                                 for (i = 0, n = 0;i < svs.maxclients;i++)
1270                                         if (svs.clients[i].active)
1271                                                 n++;
1272                                 responselength = snprintf(response, sizeof(response), "\377\377\377\377infoResponse\x0A"
1273                                                         "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
1274                                                         "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d%s%s",
1275                                                         gamename, com_modname, svs.maxclients, n,
1276                                                         sv.name, hostname.string, NET_PROTOCOL_VERSION, challenge ? "\\challenge\\" : "", challenge ? challenge : "");
1277                                 // does it fit in the buffer?
1278                                 if (responselength < (int)sizeof(response))
1279                                 {
1280                                         if (developer.integer)
1281                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1282                                         NetConn_WriteString(mysocket, response, peeraddress);
1283                                 }
1284                                 return true;
1285                         }
1286                         /*
1287                         if (!strncmp(string, "ping", 4))
1288                         {
1289                                 if (developer.integer)
1290                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1291                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1292                                 return true;
1293                         }
1294                         if (!strncmp(string, "ack", 3))
1295                                 return true;
1296                         */
1297                         // we may not have liked the packet, but it was a command packet, so
1298                         // we're done processing this packet now
1299                         return true;
1300                 }
1301                 // LordHavoc: disabled netquake control packet support in server
1302 #if 0
1303                 {
1304                         int c, control;
1305                         // netquake control packets, supported for compatibility only
1306                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1307                         {
1308                                 c = data[4];
1309                                 data += 5;
1310                                 length -= 5;
1311                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1312                                 switch (c)
1313                                 {
1314                                 case CCREQ_CONNECT:
1315                                         //if (developer.integer)
1316                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1317                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
1318                                         {
1319                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1320                                                 {
1321                                                         if (developer.integer)
1322                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1323                                                         SZ_Clear(&net_message);
1324                                                         // save space for the header, filled in later
1325                                                         MSG_WriteLong(&net_message, 0);
1326                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1327                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
1328                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1329                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1330                                                         SZ_Clear(&net_message);
1331                                                 }
1332                                                 else
1333                                                 {
1334                                                         // see if this is a duplicate connection request
1335                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1336                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1337                                                                         break;
1338                                                         if (clientnum < svs.maxclients)
1339                                                         {
1340                                                                 // duplicate connection request
1341                                                                 if (realtime - client->connecttime < 2.0)
1342                                                                 {
1343                                                                         // client is still trying to connect,
1344                                                                         // so we send a duplicate reply
1345                                                                         if (developer.integer)
1346                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1347                                                                         SZ_Clear(&net_message);
1348                                                                         // save space for the header, filled in later
1349                                                                         MSG_WriteLong(&net_message, 0);
1350                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1351                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1352                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1353                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1354                                                                         SZ_Clear(&net_message);
1355                                                                 }
1356                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1357                                                                 {
1358                                                                         // the old client hasn't sent us anything
1359                                                                         // in quite a while, so kick off and let
1360                                                                         // the retry take care of it...
1361                                                                         client->deadsocket = true;
1362                                                                 }
1363                                                         }
1364                                                         else
1365                                                         {
1366                                                                 // this is a new client, find a slot
1367                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1368                                                                         if (!client->active)
1369                                                                                 break;
1370                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
1371                                                                 {
1372                                                                         // connect to the client
1373                                                                         // everything is allocated, just fill in the details
1374                                                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
1375                                                                         if (developer.integer)
1376                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
1377                                                                         // send back the info about the server connection
1378                                                                         SZ_Clear(&net_message);
1379                                                                         // save space for the header, filled in later
1380                                                                         MSG_WriteLong(&net_message, 0);
1381                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1382                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
1383                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1384                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1385                                                                         SZ_Clear(&net_message);
1386                                                                         // now set up the client struct
1387                                                                         SV_ConnectClient(clientnum, conn);
1388                                                                         NetConn_Heartbeat(1);
1389                                                                 }
1390                                                                 else
1391                                                                 {
1392                                                                         //if (developer.integer)
1393                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
1394                                                                         // no room; try to let player know
1395                                                                         SZ_Clear(&net_message);
1396                                                                         // save space for the header, filled in later
1397                                                                         MSG_WriteLong(&net_message, 0);
1398                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1399                                                                         MSG_WriteString(&net_message, "Server is full.\n");
1400                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1401                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1402                                                                         SZ_Clear(&net_message);
1403                                                                 }
1404                                                         }
1405                                                 }
1406                                         }
1407                                         break;
1408 #if 0
1409                                 case CCREQ_SERVER_INFO:
1410                                         if (developer.integer)
1411                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
1412                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
1413                                         {
1414                                                 if (developer.integer)
1415                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
1416                                                 SZ_Clear(&net_message);
1417                                                 // save space for the header, filled in later
1418                                                 MSG_WriteLong(&net_message, 0);
1419                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1420                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1421                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1422                                                 MSG_WriteString(&net_message, hostname.string);
1423                                                 MSG_WriteString(&net_message, sv.name);
1424                                                 MSG_WriteByte(&net_message, net_activeconnections);
1425                                                 MSG_WriteByte(&net_message, svs.maxclients);
1426                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1427                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1428                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1429                                                 SZ_Clear(&net_message);
1430                                         }
1431                                         break;
1432                                 case CCREQ_PLAYER_INFO:
1433                                         if (developer.integer)
1434                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1435                                         if (sv.active)
1436                                         {
1437                                                 int playerNumber, activeNumber, clientNumber;
1438                                                 client_t *client;
1439
1440                                                 playerNumber = MSG_ReadByte();
1441                                                 activeNumber = -1;
1442                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1443                                                         if (client->active && ++activeNumber == playerNumber)
1444                                                                 break;
1445                                                 if (clientNumber != svs.maxclients)
1446                                                 {
1447                                                         SZ_Clear(&net_message);
1448                                                         // save space for the header, filled in later
1449                                                         MSG_WriteLong(&net_message, 0);
1450                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1451                                                         MSG_WriteByte(&net_message, playerNumber);
1452                                                         MSG_WriteString(&net_message, client->name);
1453                                                         MSG_WriteLong(&net_message, client->colors);
1454                                                         MSG_WriteLong(&net_message, (int)client->edict->v->frags);
1455                                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
1456                                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
1457                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1458                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1459                                                         SZ_Clear(&net_message);
1460                                                 }
1461                                         }
1462                                         break;
1463                                 case CCREQ_RULE_INFO:
1464                                         if (developer.integer)
1465                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1466                                         if (sv.active)
1467                                         {
1468                                                 char *prevCvarName;
1469                                                 cvar_t *var;
1470
1471                                                 // find the search start location
1472                                                 prevCvarName = MSG_ReadString();
1473                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1474
1475                                                 // send the response
1476                                                 SZ_Clear(&net_message);
1477                                                 // save space for the header, filled in later
1478                                                 MSG_WriteLong(&net_message, 0);
1479                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1480                                                 if (var)
1481                                                 {
1482                                                         MSG_WriteString(&net_message, var->name);
1483                                                         MSG_WriteString(&net_message, var->string);
1484                                                 }
1485                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1486                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1487                                                 SZ_Clear(&net_message);
1488                                         }
1489                                         break;
1490 #endif
1491                                 default:
1492                                         break;
1493                                 }
1494                                 // we may not have liked the packet, but it was a valid control
1495                                 // packet, so we're done processing this packet now
1496                                 return true;
1497                         }
1498                 }
1499 #endif
1500                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1501                 {
1502                         if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1503                         {
1504                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1505                                         SV_ReadClientMessage();
1506                                 return ret;
1507                         }
1508                 }
1509         }
1510         return 0;
1511 }
1512
1513 void NetConn_ServerFrame(void)
1514 {
1515         int i, length;
1516         lhnetaddress_t peeraddress;
1517         netconn_t *conn;
1518         NetConn_UpdateServerStuff();
1519         for (i = 0;i < sv_numsockets;i++)
1520                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1521                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1522         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1523         {
1524                 // never timeout loopback connections
1525                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
1526                 {
1527                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1528                         SV_DropClient(false);
1529                 }
1530         }
1531         for (conn = netconn_list;conn;conn = conn->next)
1532                 NetConn_ReSendMessage(conn);
1533 }
1534
1535 void NetConn_QueryMasters(void)
1536 {
1537         int i;
1538         int masternum;
1539         lhnetaddress_t masteraddress;
1540         char request[256];
1541
1542         if (hostcache_cachecount >= HOSTCACHE_TOTALSIZE)
1543                 return;
1544
1545         for (i = 0;i < cl_numsockets;i++)
1546         {
1547                 if (cl_sockets[i])
1548                 {
1549 #if 0
1550                         // search LAN
1551 #if 1
1552                         UDP_Broadcast(UDP_controlSock, "\377\377\377\377getinfo", 11);
1553 #else
1554                         SZ_Clear(&net_message);
1555                         // save space for the header, filled in later
1556                         MSG_WriteLong(&net_message, 0);
1557                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1558                         MSG_WriteString(&net_message, "QUAKE");
1559                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1560                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1561                         UDP_Broadcast(UDP_controlSock, net_message.data, net_message.cursize);
1562                         SZ_Clear(&net_message);
1563 #endif
1564 #endif
1565
1566                         // build the getservers
1567                         snprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1568
1569                         // search internet
1570                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1571                         {
1572                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1573                                 {
1574                                         masterquerycount++;
1575                                         NetConn_WriteString(cl_sockets[i], request, &masteraddress);
1576                                 }
1577                         }
1578                 }
1579         }
1580         if (!masterquerycount)
1581         {
1582                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
1583                 M_Update_Return_Reason("No network");
1584         }
1585 }
1586
1587 void NetConn_Heartbeat(int priority)
1588 {
1589         lhnetaddress_t masteraddress;
1590         int masternum;
1591         lhnetsocket_t *mysocket;
1592
1593         // if it's a state change (client connected), limit next heartbeat to no
1594         // more than 30 sec in the future
1595         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1596                 nextheartbeattime = realtime + 30.0;
1597
1598         // limit heartbeatperiod to 30 to 270 second range,
1599         // lower limit is to avoid abusing master servers with excess traffic,
1600         // upper limit is to avoid timing out on the master server (which uses
1601         // 300 sec timeout)
1602         if (sv_heartbeatperiod.value < 30)
1603                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1604         if (sv_heartbeatperiod.value > 270)
1605                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1606
1607         // make advertising optional and don't advertise singleplayer games, and
1608         // only send a heartbeat as often as the admin wants
1609         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1610         {
1611                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1612                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1613                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1614                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
1615         }
1616 }
1617
1618 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1619 {
1620         int i, count = 0;
1621         qbyte sent[MAX_SCOREBOARD];
1622
1623         memset(sent, 0, sizeof(sent));
1624
1625         // simultaneously wait for the first CanSendMessage and send the message,
1626         // then wait for a second CanSendMessage (verifying it was received), or
1627         // the client drops and is no longer counted
1628         // the loop aborts when either it runs out of clients to send to, or a
1629         // timeout expires
1630         blocktime += Sys_DoubleTime();
1631         do
1632         {
1633                 count = 0;
1634                 NetConn_ClientFrame();
1635                 NetConn_ServerFrame();
1636                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1637                 {
1638                         if (host_client->netconnection)
1639                         {
1640                                 if (NetConn_CanSendMessage(host_client->netconnection))
1641                                 {
1642                                         if (!sent[i])
1643                                                 NetConn_SendReliableMessage(host_client->netconnection, data);
1644                                         sent[i] = true;
1645                                 }
1646                                 if (!NetConn_CanSendMessage(host_client->netconnection))
1647                                         count++;
1648                         }
1649                 }
1650         }
1651         while (count && Sys_DoubleTime() < blocktime);
1652         return count;
1653 }
1654
1655 static void Net_Heartbeat_f(void)
1656 {
1657         if (sv.active)
1658                 NetConn_Heartbeat(2);
1659         else
1660                 Con_Print("No server running, can not heartbeat to master server.\n");
1661 }
1662
1663 void PrintStats(netconn_t *conn)
1664 {
1665         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1666 }
1667
1668 void Net_Stats_f(void)
1669 {
1670         netconn_t *conn;
1671         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1672         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1673         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1674         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1675         Con_Printf("packetsSent                = %i\n", packetsSent);
1676         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1677         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1678         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1679         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1680         Con_Print("connections                =\n");
1681         for (conn = netconn_list;conn;conn = conn->next)
1682                 PrintStats(conn);
1683 }
1684
1685 void Net_Slist_f(void)
1686 {
1687         HostCache_ResetMask();
1688         hostcache_sortbyfield = HCIF_PING;
1689         hostcache_sortdescending = false;
1690     if (m_state != m_slist) {
1691                 Con_Print("Sending requests to master servers\n");
1692                 HostCache_QueryList();
1693                 hostcache_consoleoutput = true;
1694                 Con_Print("Listening for replies...\n");
1695         } else
1696                 HostCache_QueryList();
1697 }
1698
1699 void NetConn_Init(void)
1700 {
1701         int i;
1702         lhnetaddress_t tempaddress;
1703         netconn_mempool = Mem_AllocPool("Networking", 0, NULL);
1704         Cmd_AddCommand("net_stats", Net_Stats_f);
1705         Cmd_AddCommand("net_slist", Net_Slist_f);
1706         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
1707         Cvar_RegisterVariable(&net_messagetimeout);
1708         Cvar_RegisterVariable(&net_messagerejointimeout);
1709         Cvar_RegisterVariable(&net_connecttimeout);
1710         Cvar_RegisterVariable(&cl_netlocalping);
1711         Cvar_RegisterVariable(&cl_netpacketloss);
1712         Cvar_RegisterVariable(&hostname);
1713         Cvar_RegisterVariable(&developer_networking);
1714         Cvar_RegisterVariable(&cl_netport);
1715         Cvar_RegisterVariable(&sv_netport);
1716         Cvar_RegisterVariable(&net_address);
1717         //Cvar_RegisterVariable(&net_address_ipv6);
1718         Cvar_RegisterVariable(&sv_public);
1719         Cvar_RegisterVariable(&sv_heartbeatperiod);
1720         for (i = 0;sv_masters[i].name;i++)
1721                 Cvar_RegisterVariable(&sv_masters[i]);
1722 // 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.
1723         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
1724         {
1725                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
1726                 {
1727                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
1728                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
1729                 }
1730                 else
1731                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
1732         }
1733 // 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
1734         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
1735         {
1736                 i = atoi(com_argv[i + 1]);
1737                 if (i >= 0 && i < 65536)
1738                 {
1739                         Con_Printf("-port option used, setting port cvar to %i\n", i);
1740                         Cvar_SetValueQuick(&sv_netport, i);
1741                 }
1742                 else
1743                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
1744         }
1745         cl_numsockets = 0;
1746         sv_numsockets = 0;
1747         SZ_Alloc(&net_message, NET_MAXMESSAGE, "net_message");
1748         LHNET_Init();
1749 }
1750
1751 void NetConn_Shutdown(void)
1752 {
1753         NetConn_CloseClientPorts();
1754         NetConn_CloseServerPorts();
1755         LHNET_Shutdown();
1756 }
1757