netconn.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3 Copyright (C) 2002 Mathieu Olivier
   4 Copyright (C) 2003 Forest Hale
   5
   6 This program is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public License
   8 as published by the Free Software Foundation; either version 2
   9 of the License, or (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14
  15 See the GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20
  21 */
  22
  23 #include "quakedef.h"
  24 #include "lhnet.h"
  25
  26 #define MASTER_PORT 27950
  27
  28 // note this defaults on for dedicated servers, off for listen servers
  29 cvar_t sv_public = {0, "sv_public", "0"};
  30 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "120"};
  31
  32 // FIXME: resolve DNS on masters whenever their value changes and cache it (to avoid major delays in active servers when they heartbeat)
  33 static cvar_t sv_masters [] =
  34 {
  35         {CVAR_SAVE, "sv_master1", ""},
  36         {CVAR_SAVE, "sv_master2", ""},
  37         {CVAR_SAVE, "sv_master3", ""},
  38         {CVAR_SAVE, "sv_master4", ""},
  39         {0, "sv_masterextra1", "ghdigital.com"}, //69.59.212.88
  40         {0, "sv_masterextra2", "dpmaster.deathmask.net"}, //209.164.24.243
  41         {0, "sv_masterextra3", "12.166.196.192"}, //blaze.mindphukd.org (doesn't resolve currently but works as an ip)
  42         {0, NULL, NULL}
  43 };
  44
  45 static double nextheartbeattime = 0;
  46
  47 sizebuf_t net_message;
  48 static qbyte net_message_buf[NET_MAXMESSAGE];
  49
  50 cvar_t net_messagetimeout = {0, "net_messagetimeout","300"};
  51 cvar_t net_messagerejointimeout = {0, "net_messagerejointimeout","10"};
  52 cvar_t net_connecttimeout = {0, "net_connecttimeout","10"};
  53 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED"};
  54 cvar_t developer_networking = {0, "developer_networking", "0"};
  55
  56 cvar_t cl_netlocalping = {0, "cl_netlocalping","0"};
  57 static cvar_t cl_netpacketloss = {0, "cl_netpacketloss","0"};
  58 static cvar_t net_slist_queriespersecond = {0, "net_slist_queriespersecond", "20"};
  59 static cvar_t net_slist_queriesperframe = {0, "net_slist_queriesperframe", "4"};
  60 static cvar_t net_slist_timeout = {0, "net_slist_timeout", "4"};
  61 static cvar_t net_slist_maxtries = {0, "net_slist_maxtries", "3"};
  62
  63 /* statistic counters */
  64 static int packetsSent = 0;
  65 static int packetsReSent = 0;
  66 static int packetsReceived = 0;
  67 static int receivedDuplicateCount = 0;
  68 static int droppedDatagrams = 0;
  69
  70 static int unreliableMessagesSent = 0;
  71 static int unreliableMessagesReceived = 0;
  72 static int reliableMessagesSent = 0;
  73 static int reliableMessagesReceived = 0;
  74
  75 double masterquerytime = -1000;
  76 int masterquerycount = 0;
  77 int masterreplycount = 0;
  78 int serverquerycount = 0;
  79 int serverreplycount = 0;
  80
  81 // this is only false if there are still servers left to query
  82 int serverlist_querysleep = true;
  83
  84 static qbyte sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  85 static qbyte readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  86
  87 int cl_numsockets;
  88 lhnetsocket_t *cl_sockets[16];
  89 int sv_numsockets;
  90 lhnetsocket_t *sv_sockets[16];
  91
  92 netconn_t *netconn_list = NULL;
  93 mempool_t *netconn_mempool = NULL;
  94
  95 cvar_t cl_netport = {0, "cl_port", "0"};
  96 cvar_t sv_netport = {0, "port", "26000"};
  97 cvar_t net_address = {0, "net_address", "0.0.0.0"};
  98 //cvar_t net_netaddress_ipv6 = {0, "net_address_ipv6", "[0:0:0:0:0:0:0:0]"};
  99
 100 // ServerList interface
 101 serverlist_mask_t serverlist_andmasks[SERVERLIST_ANDMASKCOUNT];
 102 serverlist_mask_t serverlist_ormasks[SERVERLIST_ORMASKCOUNT];
 103
 104 serverlist_infofield_t serverlist_sortbyfield;
 105 qboolean serverlist_sortdescending;
 106
 107 int serverlist_viewcount = 0;
 108 serverlist_entry_t *serverlist_viewlist[SERVERLIST_VIEWLISTSIZE];
 109
 110 int serverlist_cachecount;
 111 serverlist_entry_t serverlist_cache[SERVERLIST_TOTALSIZE];
 112
 113 qboolean serverlist_consoleoutput;
 114
 115 // helper function to insert a value into the viewset
 116 // spare entries will be removed
 117 static void _ServerList_ViewList_Helper_InsertBefore( int index, serverlist_entry_t *entry )
 118 {
 119     int i;
 120         if( serverlist_viewcount < SERVERLIST_VIEWLISTSIZE ) {
 121                 i = serverlist_viewcount++;
 122         } else {
 123                 i = SERVERLIST_VIEWLISTSIZE - 1;
 124         }
 125
 126         for( ; i > index ; i-- )
 127                 serverlist_viewlist[ i ] = serverlist_viewlist[ i - 1 ];
 128
 129         serverlist_viewlist[index] = entry;
 130 }
 131
 132 // we suppose serverlist_viewcount to be valid, ie > 0
 133 static void _ServerList_ViewList_Helper_Remove( int index )
 134 {
 135         serverlist_viewcount--;
 136         for( ; index < serverlist_viewcount ; index++ )
 137                 serverlist_viewlist[index] = serverlist_viewlist[index + 1];
 138 }
 139
 140 // returns true if A should be inserted before B
 141 static qboolean _ServerList_Entry_Compare( serverlist_entry_t *A, serverlist_entry_t *B )
 142 {
 143         int result = 0; // > 0 if for numbers A > B and for text if A < B
 144
 145         switch( serverlist_sortbyfield ) {
 146                 case SLIF_PING:
 147                         result = A->info.ping - B->info.ping;
 148                         break;
 149                 case SLIF_MAXPLAYERS:
 150                         result = A->info.maxplayers - B->info.maxplayers;
 151                         break;
 152                 case SLIF_NUMPLAYERS:
 153                         result = A->info.numplayers - B->info.numplayers;
 154                         break;
 155                 case SLIF_PROTOCOL:
 156                         result = A->info.protocol - B->info.protocol;
 157                         break;
 158                 case SLIF_CNAME:
 159                         result = strcmp( B->info.cname, A->info.cname );
 160                         break;
 161                 case SLIF_GAME:
 162                         result = strcmp( B->info.game, A->info.game );
 163                         break;
 164                 case SLIF_MAP:
 165                         result = strcmp( B->info.map, A->info.map );
 166                         break;
 167                 case SLIF_MOD:
 168                         result = strcmp( B->info.mod, A->info.mod );
 169                         break;
 170                 case SLIF_NAME:
 171                         result = strcmp( B->info.name, A->info.name );
 172                         break;
 173                 default:
 174                         Con_DPrint( "_ServerList_Entry_Compare: Bad serverlist_sortbyfield!\n" );
 175                         break;
 176         }
 177
 178         if( serverlist_sortdescending )
 179                 return result > 0;
 180         return result < 0;
 181 }
 182
 183 static qboolean _ServerList_CompareInt( int A, serverlist_maskop_t op, int B )
 184 {
 185         // This should actually be done with some intermediate and end-of-function return
 186         switch( op ) {
 187                 case SLMO_LESS:
 188                         return A < B;
 189                 case SLMO_LESSEQUAL:
 190                         return A <= B;
 191                 case SLMO_EQUAL:
 192                         return A == B;
 193                 case SLMO_GREATER:
 194                         return A > B;
 195                 case SLMO_NOTEQUAL:
 196                         return A != B;
 197                 case SLMO_GREATEREQUAL:
 198                 case SLMO_CONTAINS:
 199                 case SLMO_NOTCONTAIN:
 200                         return A >= B;
 201                 default:
 202                         Con_DPrint( "_ServerList_CompareInt: Bad op!\n" );
 203                         return false;
 204         }
 205 }
 206
 207 static qboolean _ServerList_CompareStr( const char *A, serverlist_maskop_t op, const char *B )
 208 {
 209         // Same here, also using an intermediate & final return would be more appropriate
 210         // A info B mask
 211         switch( op ) {
 212                 case SLMO_CONTAINS:
 213                         return *B && !!strstr( A, B ); // we want a real bool
 214                 case SLMO_NOTCONTAIN:
 215                         return !*B || !strstr( A, B );
 216                 case SLMO_LESS:
 217                         return strcmp( A, B ) < 0;
 218                 case SLMO_LESSEQUAL:
 219                         return strcmp( A, B ) <= 0;
 220                 case SLMO_EQUAL:
 221                         return strcmp( A, B ) == 0;
 222                 case SLMO_GREATER:
 223                         return strcmp( A, B ) > 0;
 224                 case SLMO_NOTEQUAL:
 225                         return strcmp( A, B ) != 0;
 226                 case SLMO_GREATEREQUAL:
 227                         return strcmp( A, B ) >= 0;
 228                 default:
 229                         Con_DPrint( "_ServerList_CompareStr: Bad op!\n" );
 230                         return false;
 231         }
 232 }
 233
 234 static qboolean _ServerList_Entry_Mask( serverlist_mask_t *mask, serverlist_info_t *info )
 235 {
 236         if( !_ServerList_CompareInt( info->ping, mask->tests[SLIF_PING], mask->info.ping ) )
 237                 return false;
 238         if( !_ServerList_CompareInt( info->maxplayers, mask->tests[SLIF_MAXPLAYERS], mask->info.maxplayers ) )
 239                 return false;
 240         if( !_ServerList_CompareInt( info->numplayers, mask->tests[SLIF_NUMPLAYERS], mask->info.numplayers ) )
 241                 return false;
 242         if( !_ServerList_CompareInt( info->protocol, mask->tests[SLIF_PROTOCOL], mask->info.protocol ))
 243                 return false;
 244         if( *mask->info.cname
 245                 && !_ServerList_CompareStr( info->cname, mask->tests[SLIF_CNAME], mask->info.cname ) )
 246                 return false;
 247         if( *mask->info.game
 248                 && !_ServerList_CompareStr( info->game, mask->tests[SLIF_GAME], mask->info.game ) )
 249                 return false;
 250         if( *mask->info.mod
 251                 && !_ServerList_CompareStr( info->mod, mask->tests[SLIF_MOD], mask->info.mod ) )
 252                 return false;
 253         if( *mask->info.map
 254                 && !_ServerList_CompareStr( info->map, mask->tests[SLIF_MAP], mask->info.map ) )
 255                 return false;
 256         if( *mask->info.name
 257                 && !_ServerList_CompareStr( info->name, mask->tests[SLIF_NAME], mask->info.name ) )
 258                 return false;
 259         return true;
 260 }
 261
 262 static void ServerList_ViewList_Insert( serverlist_entry_t *entry )
 263 {
 264         int start, end, mid;
 265
 266         // FIXME: change this to be more readable (...)
 267         // now check whether it passes through the masks
 268         for( start = 0 ; serverlist_andmasks[start].active && start < SERVERLIST_ANDMASKCOUNT ; start++ )
 269                 if( !_ServerList_Entry_Mask( &serverlist_andmasks[start], &entry->info ) )
 270                         return;
 271
 272         for( start = 0 ; serverlist_ormasks[start].active && start < SERVERLIST_ORMASKCOUNT ; start++ )
 273                 if( _ServerList_Entry_Mask( &serverlist_ormasks[start], &entry->info ) )
 274                         break;
 275         if( start == SERVERLIST_ORMASKCOUNT || (start > 0 && !serverlist_ormasks[start].active) )
 276                 return;
 277
 278         if( !serverlist_viewcount ) {
 279                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 280                 return;
 281         }
 282         // ok, insert it, we just need to find out where exactly:
 283
 284         // two special cases
 285         // check whether to insert it as new first item
 286         if( _ServerList_Entry_Compare( entry, serverlist_viewlist[0] ) ) {
 287                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 288                 return;
 289         } // check whether to insert it as new last item
 290         else if( !_ServerList_Entry_Compare( entry, serverlist_viewlist[serverlist_viewcount - 1] ) ) {
 291                 _ServerList_ViewList_Helper_InsertBefore( serverlist_viewcount, entry );
 292                 return;
 293         }
 294         start = 0;
 295         end = serverlist_viewcount - 1;
 296         while( end > start + 1 )
 297         {
 298                 mid = (start + end) / 2;
 299                 // test the item that lies in the middle between start and end
 300                 if( _ServerList_Entry_Compare( entry, serverlist_viewlist[mid] ) )
 301                         // the item has to be in the upper half
 302                         end = mid;
 303                 else
 304                         // the item has to be in the lower half
 305                         start = mid;
 306         }
 307         _ServerList_ViewList_Helper_InsertBefore( start + 1, entry );
 308 }
 309
 310 static void ServerList_ViewList_Remove( serverlist_entry_t *entry )
 311 {
 312         int i;
 313         for( i = 0; i < serverlist_viewcount; i++ )
 314         {
 315                 if (serverlist_viewlist[i] == entry)
 316                 {
 317                         _ServerList_ViewList_Helper_Remove(i);
 318                         break;
 319                 }
 320         }
 321 }
 322
 323 void ServerList_RebuildViewList(void)
 324 {
 325         int i;
 326
 327         serverlist_viewcount = 0;
 328         for( i = 0 ; i < serverlist_cachecount ; i++ )
 329                 if( serverlist_cache[i].query == SQS_QUERIED )
 330                         ServerList_ViewList_Insert( &serverlist_cache[i] );
 331 }
 332
 333 void ServerList_ResetMasks(void)
 334 {
 335         memset( &serverlist_andmasks, 0, sizeof( serverlist_andmasks ) );
 336         memset( &serverlist_ormasks, 0, sizeof( serverlist_ormasks ) );
 337 }
 338
 339 #if 0
 340 static void _ServerList_Test(void)
 341 {
 342         int i;
 343         for( i = 0 ; i < 1024 ; i++ ) {
 344                 memset( &serverlist_cache[serverlist_cachecount], 0, sizeof( serverlist_entry_t ) );
 345                 serverlist_cache[serverlist_cachecount].info.ping = 1000 + 1024 - i;
 346                 dpsnprintf( serverlist_cache[serverlist_cachecount].info.name, 128, "Black's ServerList Test %i", i );
 347                 serverlist_cache[serverlist_cachecount].finished = true;
 348                 sprintf( serverlist_cache[serverlist_cachecount].line1, "%i %s", serverlist_cache[serverlist_cachecount].info.ping, serverlist_cache[serverlist_cachecount].info.name );
 349                 ServerList_ViewList_Insert( &serverlist_cache[serverlist_cachecount] );
 350                 serverlist_cachecount++;
 351         }
 352 }
 353 #endif
 354
 355 void ServerList_QueryList(void)
 356 {
 357         masterquerytime = realtime;
 358         masterquerycount = 0;
 359         masterreplycount = 0;
 360         serverquerycount = 0;
 361         serverreplycount = 0;
 362         serverlist_cachecount = 0;
 363         serverlist_viewcount = 0;
 364         serverlist_consoleoutput = false;
 365
 366         //_ServerList_Test();
 367
 368         NetConn_QueryMasters();
 369 }
 370
 371 // rest
 372
 373 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
 374 {
 375         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
 376         int i;
 377         if (length == 0)
 378                 return 0;
 379         if (cl_netpacketloss.integer)
 380                 for (i = 0;i < cl_numsockets;i++)
 381                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 382                                 return 0;
 383         if (developer_networking.integer)
 384         {
 385                 char addressstring[128], addressstring2[128];
 386                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 387                 if (length > 0)
 388                 {
 389                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 390                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
 391                         Com_HexDumpToConsole(data, length);
 392                 }
 393                 else
 394                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
 395         }
 396         return length;
 397 }
 398
 399 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 400 {
 401         int ret;
 402         int i;
 403         if (cl_netpacketloss.integer)
 404                 for (i = 0;i < cl_numsockets;i++)
 405                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 406                                 return length;
 407         ret = LHNET_Write(mysocket, data, length, peeraddress);
 408         if (developer_networking.integer)
 409         {
 410                 char addressstring[128], addressstring2[128];
 411                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 412                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 413                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 414                 Com_HexDumpToConsole(data, length);
 415         }
 416         return ret;
 417 }
 418
 419 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 420 {
 421         // note this does not include the trailing NULL because we add that in the parser
 422         return NetConn_Write(mysocket, string, strlen(string), peeraddress);
 423 }
 424
 425 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
 426 {
 427         unsigned int packetLen;
 428         unsigned int dataLen;
 429         unsigned int eom;
 430         unsigned int *header;
 431
 432 //#ifdef DEBUG
 433         if (data->cursize == 0)
 434                 Sys_Error("Datagram_SendMessage: zero length message\n");
 435
 436         if (data->cursize > (int)sizeof(conn->sendMessage))
 437                 Sys_Error("Datagram_SendMessage: message too big (%u > %u)\n", data->cursize, sizeof(conn->sendMessage));
 438
 439         if (conn->canSend == false)
 440                 Sys_Error("SendMessage: called with canSend == false\n");
 441 //#endif
 442
 443         memcpy(conn->sendMessage, data->data, data->cursize);
 444         conn->sendMessageLength = data->cursize;
 445
 446         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 447         {
 448                 dataLen = conn->sendMessageLength;
 449                 eom = NETFLAG_EOM;
 450         }
 451         else
 452         {
 453                 dataLen = MAX_PACKETFRAGMENT;
 454                 eom = 0;
 455         }
 456
 457         packetLen = NET_HEADERSIZE + dataLen;
 458
 459         header = (void *)sendbuffer;
 460         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 461         header[1] = BigLong(conn->sendSequence);
 462         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 463
 464         conn->sendSequence++;
 465         conn->canSend = false;
 466
 467         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 468                 return -1;
 469
 470         conn->lastSendTime = realtime;
 471         packetsSent++;
 472         reliableMessagesSent++;
 473         return 1;
 474 }
 475
 476 static void NetConn_SendMessageNext(netconn_t *conn)
 477 {
 478         unsigned int packetLen;
 479         unsigned int dataLen;
 480         unsigned int eom;
 481         unsigned int *header;
 482
 483         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
 484         {
 485                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 486                 {
 487                         dataLen = conn->sendMessageLength;
 488                         eom = NETFLAG_EOM;
 489                 }
 490                 else
 491                 {
 492                         dataLen = MAX_PACKETFRAGMENT;
 493                         eom = 0;
 494                 }
 495
 496                 packetLen = NET_HEADERSIZE + dataLen;
 497
 498                 header = (void *)sendbuffer;
 499                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 500                 header[1] = BigLong(conn->sendSequence);
 501                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 502
 503                 conn->sendSequence++;
 504                 conn->sendNext = false;
 505
 506                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 507                         return;
 508
 509                 conn->lastSendTime = realtime;
 510                 packetsSent++;
 511         }
 512 }
 513
 514 static void NetConn_ReSendMessage(netconn_t *conn)
 515 {
 516         unsigned int packetLen;
 517         unsigned int dataLen;
 518         unsigned int eom;
 519         unsigned int *header;
 520
 521         if (conn->sendMessageLength && !conn->canSend && (realtime - conn->lastSendTime) > 1.0)
 522         {
 523                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 524                 {
 525                         dataLen = conn->sendMessageLength;
 526                         eom = NETFLAG_EOM;
 527                 }
 528                 else
 529                 {
 530                         dataLen = MAX_PACKETFRAGMENT;
 531                         eom = 0;
 532                 }
 533
 534                 packetLen = NET_HEADERSIZE + dataLen;
 535
 536                 header = (void *)sendbuffer;
 537                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 538                 header[1] = BigLong(conn->sendSequence - 1);
 539                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 540
 541                 conn->sendNext = false;
 542
 543                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 544                         return;
 545
 546                 conn->lastSendTime = realtime;
 547                 packetsReSent++;
 548         }
 549 }
 550
 551 qboolean NetConn_CanSendMessage(netconn_t *conn)
 552 {
 553         return conn->canSend;
 554 }
 555
 556 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
 557 {
 558         int packetLen;
 559         int *header;
 560
 561         packetLen = NET_HEADERSIZE + data->cursize;
 562
 563 //#ifdef DEBUG
 564         if (data->cursize == 0)
 565                 Sys_Error("Datagram_SendUnreliableMessage: zero length message\n");
 566
 567         if (packetLen > (int)sizeof(sendbuffer))
 568                 Sys_Error("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
 569 //#endif
 570
 571         header = (void *)sendbuffer;
 572         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
 573         header[1] = BigLong(conn->unreliableSendSequence);
 574         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
 575
 576         conn->unreliableSendSequence++;
 577
 578         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 579                 return -1;
 580
 581         packetsSent++;
 582         unreliableMessagesSent++;
 583         return 1;
 584 }
 585
 586 void NetConn_CloseClientPorts(void)
 587 {
 588         for (;cl_numsockets > 0;cl_numsockets--)
 589                 if (cl_sockets[cl_numsockets - 1])
 590                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 591 }
 592
 593 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
 594 {
 595         lhnetaddress_t address;
 596         lhnetsocket_t *s;
 597         char addressstring2[1024];
 598         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 599         {
 600                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 601                 {
 602                         cl_sockets[cl_numsockets++] = s;
 603                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 604                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
 605                 }
 606                 else
 607                 {
 608                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 609                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
 610                 }
 611         }
 612         else
 613                 Con_Printf("Client unable to parse address %s\n", addressstring);
 614 }
 615
 616 void NetConn_OpenClientPorts(void)
 617 {
 618         int port;
 619         NetConn_CloseClientPorts();
 620         port = bound(0, cl_netport.integer, 65535);
 621         if (cl_netport.integer != port)
 622                 Cvar_SetValueQuick(&cl_netport, port);
 623         Con_Printf("Client using port %i\n", port);
 624         NetConn_OpenClientPort("local:2", 0);
 625         NetConn_OpenClientPort(net_address.string, port);
 626         //NetConn_OpenClientPort(net_address_ipv6.string, port);
 627 }
 628
 629 void NetConn_CloseServerPorts(void)
 630 {
 631         for (;sv_numsockets > 0;sv_numsockets--)
 632                 if (sv_sockets[sv_numsockets - 1])
 633                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 634 }
 635
 636 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
 637 {
 638         lhnetaddress_t address;
 639         lhnetsocket_t *s;
 640         char addressstring2[1024];
 641         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 642         {
 643                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 644                 {
 645                         sv_sockets[sv_numsockets++] = s;
 646                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 647                         Con_Printf("Server listening on address %s\n", addressstring2);
 648                 }
 649                 else
 650                 {
 651                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 652                         Con_Printf("Server failed to open socket on address %s\n", addressstring2);
 653                 }
 654         }
 655         else
 656                 Con_Printf("Server unable to parse address %s\n", addressstring);
 657 }
 658
 659 void NetConn_OpenServerPorts(int opennetports)
 660 {
 661         int port;
 662         NetConn_CloseServerPorts();
 663         port = bound(0, sv_netport.integer, 65535);
 664         if (port == 0)
 665                 port = 26000;
 666         Con_Printf("Server using port %i\n", port);
 667         if (sv_netport.integer != port)
 668                 Cvar_SetValueQuick(&sv_netport, port);
 669         if (cls.state != ca_dedicated)
 670                 NetConn_OpenServerPort("local:1", 0);
 671         if (opennetports)
 672         {
 673                 NetConn_OpenServerPort(net_address.string, port);
 674                 //NetConn_OpenServerPort(net_address_ipv6.string, port);
 675         }
 676         if (sv_numsockets == 0)
 677                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!\n");
 678 }
 679
 680 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 681 {
 682         int i, a = LHNETADDRESS_GetAddressType(address);
 683         for (i = 0;i < cl_numsockets;i++)
 684                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 685                         return cl_sockets[i];
 686         return NULL;
 687 }
 688
 689 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 690 {
 691         int i, a = LHNETADDRESS_GetAddressType(address);
 692         for (i = 0;i < sv_numsockets;i++)
 693                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 694                         return sv_sockets[i];
 695         return NULL;
 696 }
 697
 698 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 699 {
 700         netconn_t *conn;
 701         conn = Mem_Alloc(netconn_mempool, sizeof(*conn));
 702         conn->mysocket = mysocket;
 703         conn->peeraddress = *peeraddress;
 704         conn->canSend = true;
 705         conn->lastMessageTime = realtime;
 706         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
 707         // reduce effectiveness of connection request floods
 708         conn->timeout = realtime + net_connecttimeout.value;
 709         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
 710         conn->next = netconn_list;
 711         netconn_list = conn;
 712         return conn;
 713 }
 714
 715 void NetConn_Close(netconn_t *conn)
 716 {
 717         netconn_t *c;
 718         // remove connection from list
 719         if (conn == netconn_list)
 720                 netconn_list = conn->next;
 721         else
 722         {
 723                 for (c = netconn_list;c;c = c->next)
 724                 {
 725                         if (c->next == conn)
 726                         {
 727                                 c->next = conn->next;
 728                                 break;
 729                         }
 730                 }
 731                 // not found in list, we'll avoid crashing here...
 732                 if (!c)
 733                         return;
 734         }
 735         // free connection
 736         Mem_Free(conn);
 737 }
 738
 739 static int clientport = -1;
 740 static int clientport2 = -1;
 741 static int hostport = -1;
 742 static void NetConn_UpdateServerStuff(void)
 743 {
 744         if (cls.state != ca_dedicated)
 745         {
 746                 if (clientport2 != cl_netport.integer)
 747                 {
 748                         clientport2 = cl_netport.integer;
 749                         if (cls.state == ca_connected)
 750                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
 751                 }
 752                 if (cls.state == ca_disconnected && clientport != clientport2)
 753                 {
 754                         clientport = clientport2;
 755                         NetConn_CloseClientPorts();
 756                 }
 757                 if (cl_numsockets == 0)
 758                         NetConn_OpenClientPorts();
 759         }
 760
 761         if (hostport != sv_netport.integer)
 762         {
 763                 hostport = sv_netport.integer;
 764                 if (sv.active)
 765                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
 766         }
 767 }
 768
 769 int NetConn_ReceivedMessage(netconn_t *conn, qbyte *data, int length)
 770 {
 771         unsigned int count;
 772         unsigned int flags;
 773         unsigned int sequence;
 774         int qlength;
 775
 776         if (length >= 8)
 777         {
 778                 qlength = (unsigned int)BigLong(((int *)data)[0]);
 779                 flags = qlength & ~NETFLAG_LENGTH_MASK;
 780                 qlength &= NETFLAG_LENGTH_MASK;
 781                 // control packets were already handled
 782                 if (!(flags & NETFLAG_CTL) && qlength == length)
 783                 {
 784                         sequence = BigLong(((int *)data)[1]);
 785                         packetsReceived++;
 786                         data += 8;
 787                         length -= 8;
 788                         if (flags & NETFLAG_UNRELIABLE)
 789                         {
 790                                 if (sequence >= conn->unreliableReceiveSequence)
 791                                 {
 792                                         if (sequence > conn->unreliableReceiveSequence)
 793                                         {
 794                                                 count = sequence - conn->unreliableReceiveSequence;
 795                                                 droppedDatagrams += count;
 796                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
 797                                         }
 798                                         conn->unreliableReceiveSequence = sequence + 1;
 799                                         conn->lastMessageTime = realtime;
 800                                         conn->timeout = realtime + net_messagetimeout.value;
 801                                         unreliableMessagesReceived++;
 802                                         if (length > 0)
 803                                         {
 804                                                 SZ_Clear(&net_message);
 805                                                 SZ_Write(&net_message, data, length);
 806                                                 MSG_BeginReading();
 807                                                 return 2;
 808                                         }
 809                                 }
 810                                 else
 811                                         Con_DPrint("Got a stale datagram\n");
 812                                 return 1;
 813                         }
 814                         else if (flags & NETFLAG_ACK)
 815                         {
 816                                 if (sequence == (conn->sendSequence - 1))
 817                                 {
 818                                         if (sequence == conn->ackSequence)
 819                                         {
 820                                                 conn->ackSequence++;
 821                                                 if (conn->ackSequence != conn->sendSequence)
 822                                                         Con_DPrint("ack sequencing error\n");
 823                                                 conn->lastMessageTime = realtime;
 824                                                 conn->timeout = realtime + net_messagetimeout.value;
 825                                                 conn->sendMessageLength -= MAX_PACKETFRAGMENT;
 826                                                 if (conn->sendMessageLength > 0)
 827                                                 {
 828                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
 829                                                         conn->sendNext = true;
 830                                                         NetConn_SendMessageNext(conn);
 831                                                 }
 832                                                 else
 833                                                 {
 834                                                         conn->sendMessageLength = 0;
 835                                                         conn->canSend = true;
 836                                                 }
 837                                         }
 838                                         else
 839                                                 Con_DPrint("Duplicate ACK received\n");
 840                                 }
 841                                 else
 842                                         Con_DPrint("Stale ACK received\n");
 843                                 return 1;
 844                         }
 845                         else if (flags & NETFLAG_DATA)
 846                         {
 847                                 unsigned int temppacket[2];
 848                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
 849                                 temppacket[1] = BigLong(sequence);
 850                                 NetConn_Write(conn->mysocket, (qbyte *)temppacket, 8, &conn->peeraddress);
 851                                 if (sequence == conn->receiveSequence)
 852                                 {
 853                                         conn->lastMessageTime = realtime;
 854                                         conn->timeout = realtime + net_messagetimeout.value;
 855                                         conn->receiveSequence++;
 856                                         if( conn->receiveMessageLength + length <= sizeof( conn->receiveMessage ) ) {
 857                                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
 858                                                 conn->receiveMessageLength += length;
 859                                         } else {
 860                                                 Con_Printf( "Reliable message (seq: %i) too big for message buffer!\n"
 861                                                                         "Dropping the message!\n", sequence );
 862                                                 conn->receiveMessageLength = 0;
 863                                                 return 1;
 864                                         }
 865                                         if (flags & NETFLAG_EOM)
 866                                         {
 867                                                 reliableMessagesReceived++;
 868                                                 length = conn->receiveMessageLength;
 869                                                 conn->receiveMessageLength = 0;
 870                                                 if (length > 0)
 871                                                 {
 872                                                         SZ_Clear(&net_message);
 873                                                         SZ_Write(&net_message, conn->receiveMessage, length);
 874                                                         MSG_BeginReading();
 875                                                         return 2;
 876                                                 }
 877                                         }
 878                                 }
 879                                 else
 880                                         receivedDuplicateCount++;
 881                                 return 1;
 882                         }
 883                 }
 884         }
 885         return 0;
 886 }
 887
 888 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 889 {
 890         cls.connect_trying = false;
 891         M_Update_Return_Reason("");
 892         // the connection request succeeded, stop current connection and set up a new connection
 893         CL_Disconnect();
 894         // if we're connecting to a remote server, shut down any local server
 895         if (LHNETADDRESS_GetAddressType(peeraddress) != LHNETADDRESSTYPE_LOOP && sv.active)
 896                 Host_ShutdownServer (false);
 897         // allocate a net connection to keep track of things
 898         cls.netcon = NetConn_Open(mysocket, peeraddress);
 899         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
 900         key_dest = key_game;
 901         m_state = m_none;
 902         cls.demonum = -1;                       // not in the demo loop now
 903         cls.state = ca_connected;
 904         cls.signon = 0;                         // need all the signon messages before playing
 905 }
 906
 907 int NetConn_IsLocalGame(void)
 908 {
 909         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
 910                 return true;
 911         return false;
 912 }
 913
 914 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 915 {
 916         int ret, c, control;
 917         const char *s;
 918         char *string, addressstring2[128], cname[128], ipstring[32];
 919         char stringbuf[16384];
 920
 921         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 922         {
 923                 // received a command string - strip off the packaging and put it
 924                 // into our string buffer with NULL termination
 925                 data += 4;
 926                 length -= 4;
 927                 length = min(length, (int)sizeof(stringbuf) - 1);
 928                 memcpy(stringbuf, data, length);
 929                 stringbuf[length] = 0;
 930                 string = stringbuf;
 931
 932                 if (developer.integer)
 933                 {
 934                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 935                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
 936                         Com_HexDumpToConsole(data, length);
 937                 }
 938
 939                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
 940                 {
 941                         char protocolnames[1400];
 942                         Protocol_Names(protocolnames, sizeof(protocolnames));
 943                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 944                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
 945                         M_Update_Return_Reason("Got challenge response");
 946                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\protocols\\%s\\challenge\\%s", protocolnames, string + 10), peeraddress);
 947                         return true;
 948                 }
 949                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
 950                 {
 951                         M_Update_Return_Reason("Accepted");
 952                         NetConn_ConnectionEstablished(mysocket, peeraddress);
 953                         return true;
 954                 }
 955                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
 956                 {
 957                         char rejectreason[32];
 958                         cls.connect_trying = false;
 959                         string += 7;
 960                         length = max(length - 7, (int)sizeof(rejectreason) - 1);
 961                         memcpy(rejectreason, string, length);
 962                         rejectreason[length] = 0;
 963                         M_Update_Return_Reason(rejectreason);
 964                         return true;
 965                 }
 966                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
 967                 {
 968                         serverlist_info_t *info;
 969                         int i, n;
 970                         double pingtime;
 971
 972                         string += 13;
 973                         // serverlist only uses text addresses
 974                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
 975                         // search the cache for this server and update it
 976                         for( n = 0; n < serverlist_cachecount; n++ )
 977                                 if( !strcmp( cname, serverlist_cache[n].info.cname ) )
 978                                         break;
 979                         if( n == serverlist_cachecount ) {
 980                                 // LAN search doesnt require an answer from the master server so we wont
 981                                 // know the ping nor will it be initialized already...
 982
 983                                 // find a slot
 984                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
 985                                         return true;
 986
 987                                 memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
 988                                 // store the data the engine cares about (address and ping)
 989                                 strlcpy (serverlist_cache[serverlist_cachecount].info.cname, cname, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
 990                                 serverlist_cache[serverlist_cachecount].info.ping = 100000;
 991                                 serverlist_cache[serverlist_cachecount].querytime = realtime;
 992                                 // if not in the slist menu we should print the server to console
 993                                 if (serverlist_consoleoutput) {
 994                                         Con_Printf("querying %s\n", ipstring);
 995                                 }
 996
 997                                 ++serverlist_cachecount;
 998                         }
 999
1000                         info = &serverlist_cache[n].info;
1001                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));else info->game[0] = 0;
1002                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1003                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1004                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1005                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);else info->protocol = -1;
1006                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);else info->numplayers = 0;
1007                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1008
1009                         if (info->ping == 100000)
1010                                         serverreplycount++;
1011
1012                         pingtime = (int)((realtime - serverlist_cache[n].querytime) * 1000.0);
1013                         pingtime = bound(0, pingtime, 9999);
1014                         // update the ping
1015                         info->ping = pingtime;
1016
1017                         // legacy/old stuff move it to the menu ASAP
1018
1019                         // build description strings for the things users care about
1020                         dpsnprintf(serverlist_cache[n].line1, sizeof(serverlist_cache[n].line1), "%5d%c%3u/%3u %-65.65s", (int)pingtime, info->protocol != NET_PROTOCOL_VERSION ? '*' : ' ', info->numplayers, info->maxplayers, info->name);
1021                         dpsnprintf(serverlist_cache[n].line2, sizeof(serverlist_cache[n].line2), "%-21.21s %-19.19s %-17.17s %-20.20s", info->cname, info->game, info->mod, info->map);
1022                         // if ping is especially high, display it as such
1023                         if (pingtime >= 300)
1024                         {
1025                                 // orange numbers (lower block)
1026                                 for (i = 0;i < 5;i++)
1027                                         if (serverlist_cache[n].line1[i] != ' ')
1028                                                 serverlist_cache[n].line1[i] += 128;
1029                         }
1030                         else if (pingtime >= 200)
1031                         {
1032                                 // yellow numbers (in upper block)
1033                                 for (i = 0;i < 5;i++)
1034                                         if (serverlist_cache[n].line1[i] != ' ')
1035                                                 serverlist_cache[n].line1[i] -= 30;
1036                         }
1037                         if( serverlist_cache[n].query == SQS_QUERIED ) {
1038                                 ServerList_ViewList_Remove( &serverlist_cache[n] );
1039                         }
1040                         // if not in the slist menu we should print the server to console (if wanted)
1041                         else if( serverlist_consoleoutput )
1042                                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1043                         // and finally, update the view set
1044                         ServerList_ViewList_Insert( &serverlist_cache[n] );
1045                         serverlist_cache[n].query = SQS_QUERIED;
1046
1047                         return true;
1048                 }
1049                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1050                 {
1051                         // Extract the IP addresses
1052                         data += 18;
1053                         length -= 18;
1054                         masterreplycount++;
1055                         if (serverlist_consoleoutput)
1056                                 Con_Print("received server list...\n");
1057                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
1058                         {
1059                                 int n;
1060
1061                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
1062                                 if (developer.integer)
1063                                         Con_Printf("Requesting info from server %s\n", ipstring);
1064                                 // ignore the rest of the message if the serverlist is full
1065                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1066                                         break;
1067                                 // also ignore it if we have already queried it (other master server response)
1068                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1069                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1070                                                 break;
1071                                 if( n >= serverlist_cachecount )
1072                                 {
1073                                         serverquerycount++;
1074
1075                                         memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1076                                         // store the data the engine cares about (address and ping)
1077                                         strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1078                                         serverlist_cache[serverlist_cachecount].info.ping = 100000;
1079                                         serverlist_cache[serverlist_cachecount].query = SQS_QUERYING;
1080
1081                                         ++serverlist_cachecount;
1082                                 }
1083
1084                                 // move on to next address in packet
1085                                 data += 7;
1086                                 length -= 7;
1087                         }
1088                         // begin or resume serverlist queries
1089                         serverlist_querysleep = false;
1090                         return true;
1091                 }
1092                 /*
1093                 if (!strncmp(string, "ping", 4))
1094                 {
1095                         if (developer.integer)
1096                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1097                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1098                         return true;
1099                 }
1100                 if (!strncmp(string, "ack", 3))
1101                         return true;
1102                 */
1103                 // we may not have liked the packet, but it was a command packet, so
1104                 // we're done processing this packet now
1105                 return true;
1106         }
1107         // netquake control packets, supported for compatibility only
1108         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1109         {
1110                 c = data[4];
1111                 data += 5;
1112                 length -= 5;
1113                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1114                 switch (c)
1115                 {
1116                 case CCREP_ACCEPT:
1117                         if (developer.integer)
1118                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
1119                         if (cls.connect_trying)
1120                         {
1121                                 lhnetaddress_t clientportaddress;
1122                                 clientportaddress = *peeraddress;
1123                                 if (length >= 4)
1124                                 {
1125                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
1126                                         data += 4;
1127                                         length -= 4;
1128                                         LHNETADDRESS_SetPort(&clientportaddress, port);
1129                                 }
1130                                 M_Update_Return_Reason("Accepted");
1131                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress);
1132                         }
1133                         break;
1134                 case CCREP_REJECT:
1135                         if (developer.integer)
1136                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1137                         cls.connect_trying = false;
1138                         M_Update_Return_Reason(data);
1139                         break;
1140 #if 0
1141                 case CCREP_SERVER_INFO:
1142                         if (developer.integer)
1143                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1144                         if (cls.state != ca_dedicated)
1145                         {
1146                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
1147                                 // string we just ignore it and keep the real address
1148                                 MSG_ReadString();
1149                                 // serverlist only uses text addresses
1150                                 cname = UDP_AddrToString(readaddr);
1151                                 // search the cache for this server
1152                                 for (n = 0; n < hostCacheCount; n++)
1153                                         if (!strcmp(cname, serverlist[n].cname))
1154                                                 break;
1155                                 // add it
1156                                 if (n == hostCacheCount && hostCacheCount < SERVERLISTSIZE)
1157                                 {
1158                                         hostCacheCount++;
1159                                         memset(&serverlist[n], 0, sizeof(serverlist[n]));
1160                                         strlcpy (serverlist[n].name, MSG_ReadString(), sizeof (serverlist[n].name));
1161                                         strlcpy (serverlist[n].map, MSG_ReadString(), sizeof (serverlist[n].map));
1162                                         serverlist[n].users = MSG_ReadByte();
1163                                         serverlist[n].maxusers = MSG_ReadByte();
1164                                         c = MSG_ReadByte();
1165                                         if (c != NET_PROTOCOL_VERSION)
1166                                         {
1167                                                 strlcpy (serverlist[n].cname, serverlist[n].name, sizeof (serverlist[n].cname));
1168                                                 strcpy(serverlist[n].name, "*");
1169                                                 strlcat (serverlist[n].name, serverlist[n].cname, sizeof(serverlist[n].name));
1170                                         }
1171                                         strlcpy (serverlist[n].cname, cname, sizeof (serverlist[n].cname));
1172                                 }
1173                         }
1174                         break;
1175                 case CCREP_PLAYER_INFO:
1176                         // we got a CCREP_PLAYER_INFO??
1177                         //if (developer.integer)
1178                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1179                         break;
1180                 case CCREP_RULE_INFO:
1181                         // we got a CCREP_RULE_INFO??
1182                         //if (developer.integer)
1183                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1184                         break;
1185 #endif
1186                 default:
1187                         break;
1188                 }
1189                 // we may not have liked the packet, but it was a valid control
1190                 // packet, so we're done processing this packet now
1191                 return true;
1192         }
1193         ret = 0;
1194         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)
1195                 CL_ParseServerMessage();
1196         return ret;
1197 }
1198
1199 void NetConn_QueryQueueFrame(void)
1200 {
1201         int index;
1202         int queries;
1203         int maxqueries;
1204         double timeouttime;
1205         static double querycounter = 0;
1206
1207         if (serverlist_querysleep)
1208                 return;
1209
1210         // each time querycounter reaches 1.0 issue a query
1211         querycounter += host_realframetime * net_slist_queriespersecond.value;
1212         maxqueries = (int)querycounter;
1213         maxqueries = bound(0, maxqueries, net_slist_queriesperframe.integer);
1214         querycounter -= maxqueries;
1215
1216         if( maxqueries == 0 ) {
1217                 return;
1218         }
1219
1220         // scan serverlist and issue queries as needed
1221     serverlist_querysleep = true;
1222
1223         timeouttime = realtime - net_slist_timeout.value;
1224         for( index = 0, queries = 0 ; index < serverlist_cachecount && queries < maxqueries ; index++ )
1225         {
1226                 serverlist_entry_t *entry = &serverlist_cache[ index ];
1227                 if( entry->query != SQS_QUERYING )
1228                 {
1229                         continue;
1230                 }
1231
1232         serverlist_querysleep = false;
1233                 if( entry->querycounter != 0 && entry->querytime > timeouttime )
1234                 {
1235                         continue;
1236                 }
1237
1238                 if( entry->querycounter != (unsigned) net_slist_maxtries.integer )
1239                 {
1240                         lhnetaddress_t address;
1241                         int socket;
1242
1243                         LHNETADDRESS_FromString(&address, entry->info.cname, 0);
1244                         for (socket = 0; socket < cl_numsockets ; socket++) {
1245                                 NetConn_WriteString(cl_sockets[socket], "\377\377\377\377getinfo", &address);
1246                         }
1247
1248                         entry->querytime = realtime;
1249                         entry->querycounter++;
1250
1251                         // if not in the slist menu we should print the server to console
1252                         if (serverlist_consoleoutput)
1253                                 Con_Printf("querying %25s (%i. try)\n", entry->info.cname, entry->querycounter);
1254
1255                         queries++;
1256                 }
1257                 else
1258                 {
1259                         entry->query = SQS_TIMEDOUT;
1260                 }
1261         }
1262 }
1263
1264 void NetConn_ClientFrame(void)
1265 {
1266         int i, length;
1267         lhnetaddress_t peeraddress;
1268         netconn_t *conn;
1269         NetConn_UpdateServerStuff();
1270         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
1271         {
1272                 if (cls.connect_remainingtries == 0)
1273                         M_Update_Return_Reason("Connect: Waiting 10 seconds for reply");
1274                 cls.connect_nextsendtime = realtime + 1;
1275                 cls.connect_remainingtries--;
1276                 if (cls.connect_remainingtries <= -10)
1277                 {
1278                         cls.connect_trying = false;
1279                         M_Update_Return_Reason("Connect: Failed");
1280                         return;
1281                 }
1282                 // try challenge first (newer server)
1283                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
1284                 // then try netquake as a fallback (old server, or netquake)
1285                 SZ_Clear(&net_message);
1286                 // save space for the header, filled in later
1287                 MSG_WriteLong(&net_message, 0);
1288                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
1289                 MSG_WriteString(&net_message, "QUAKE");
1290                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1291                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1292                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
1293                 SZ_Clear(&net_message);
1294         }
1295         for (i = 0;i < cl_numsockets;i++) {
1296                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0) {
1297                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
1298                 }
1299         }
1300         NetConn_QueryQueueFrame();
1301         if (cls.netcon && realtime > cls.netcon->timeout)
1302         {
1303                 Con_Print("Connection timed out\n");
1304                 CL_Disconnect();
1305                 Host_ShutdownServer (false);
1306         }
1307         for (conn = netconn_list;conn;conn = conn->next)
1308                 NetConn_ReSendMessage(conn);
1309 }
1310
1311 #define MAX_CHALLENGES 128
1312 struct
1313 {
1314         lhnetaddress_t address;
1315         double time;
1316         char string[12];
1317 }
1318 challenge[MAX_CHALLENGES];
1319
1320 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
1321 {
1322         int i;
1323         char c;
1324         for (i = 0;i < bufferlength - 1;i++)
1325         {
1326                 do
1327                 {
1328                         c = rand () % (127 - 33) + 33;
1329                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
1330                 buffer[i] = c;
1331         }
1332         buffer[i] = 0;
1333 }
1334
1335 static qboolean NetConn_BuildStatusResponse(const char* challenge, char* out_msg, size_t out_size, qboolean fullstatus)
1336 {
1337         unsigned int nb_clients = 0, i;
1338         int length;
1339
1340         // How many clients are there?
1341         for (i = 0;i < (unsigned int)svs.maxclients;i++)
1342                 if (svs.clients[i].active)
1343                         nb_clients++;
1344
1345         // TODO: we should add more information for the full status string
1346         length = dpsnprintf(out_msg, out_size,
1347                                                 "\377\377\377\377%s\x0A"
1348                                                 "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
1349                                                 "\\clients\\%d\\mapname\\%s\\hostname\\%s""\\protocol\\%d"
1350                                                 "%s%s"
1351                                                 "%s",
1352                                                 fullstatus ? "statusResponse" : "infoResponse",
1353                                                 gamename, com_modname, svs.maxclients,
1354                                                 nb_clients, sv.name, hostname.string, NET_PROTOCOL_VERSION,
1355                                                 challenge ? "\\challenge\\" : "", challenge ? challenge : "",
1356                                                 fullstatus ? "\n" : "");
1357
1358         // Make sure it fits in the buffer
1359         if (length < 0)
1360                 return false;
1361
1362         if (fullstatus)
1363         {
1364                 char *ptr;
1365                 int left;
1366
1367                 ptr = out_msg + length;
1368                 left = out_size - length;
1369
1370                 for (i = 0;i < (unsigned int)svs.maxclients;i++)
1371                 {
1372                         client_t *cl = &svs.clients[i];
1373                         if (cl->active)
1374                         {
1375                                 int nameind, cleanind;
1376                                 char curchar;
1377                                 char cleanname [sizeof(cl->name)];
1378
1379                                 // Remove all characters '"' and '\' in the player name
1380                                 nameind = 0;
1381                                 cleanind = 0;
1382                                 do
1383                                 {
1384                                         curchar = cl->name[nameind++];
1385                                         if (curchar != '"' && curchar != '\\')
1386                                         {
1387                                                 cleanname[cleanind++] = curchar;
1388                                                 if (cleanind == sizeof(cleanname) - 1)
1389                                                         break;
1390                                         }
1391                                 } while (curchar != '\0');
1392
1393                                 length = dpsnprintf(ptr, left, "%d %d \"%s\"\n",
1394                                                                         cl->frags,
1395                                                                         (int)(cl->ping * 1000.0f),
1396                                                                         cleanname);
1397                                 if(length < 0)
1398                                         return false;
1399                                 left -= length;
1400                                 ptr += length;
1401                         }
1402                 }
1403         }
1404
1405         return true;
1406 }
1407
1408 extern void SV_SendServerinfo (client_t *client);
1409 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
1410 {
1411         int i, ret, clientnum, best;
1412         double besttime;
1413         client_t *client;
1414         netconn_t *conn;
1415         char *s, *string, response[512], addressstring2[128], stringbuf[16384];
1416
1417         if (sv.active)
1418         {
1419                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1420                 {
1421                         // received a command string - strip off the packaging and put it
1422                         // into our string buffer with NULL termination
1423                         data += 4;
1424                         length -= 4;
1425                         length = min(length, (int)sizeof(stringbuf) - 1);
1426                         memcpy(stringbuf, data, length);
1427                         stringbuf[length] = 0;
1428                         string = stringbuf;
1429
1430                         if (developer.integer)
1431                         {
1432                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1433                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1434                                 Com_HexDumpToConsole(data, length);
1435                         }
1436
1437                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
1438                         {
1439                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1440                                 {
1441                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1442                                                 break;
1443                                         if (besttime > challenge[i].time)
1444                                                 besttime = challenge[best = i].time;
1445                                 }
1446                                 // if we did not find an exact match, choose the oldest and
1447                                 // update address and string
1448                                 if (i == MAX_CHALLENGES)
1449                                 {
1450                                         i = best;
1451                                         challenge[i].address = *peeraddress;
1452                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1453                                 }
1454                                 challenge[i].time = realtime;
1455                                 // send the challenge
1456                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1457                                 return true;
1458                         }
1459                         if (length > 8 && !memcmp(string, "connect\\", 8))
1460                         {
1461                                 string += 7;
1462                                 length -= 7;
1463                                 if ((s = SearchInfostring(string, "challenge")))
1464                                 {
1465                                         // validate the challenge
1466                                         for (i = 0;i < MAX_CHALLENGES;i++)
1467                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1468                                                         break;
1469                                         if (i < MAX_CHALLENGES)
1470                                         {
1471                                                 // check engine protocol
1472                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1473                                                 {
1474                                                         if (developer.integer)
1475                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1476                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1477                                                 }
1478                                                 else
1479                                                 {
1480                                                         // see if this is a duplicate connection request
1481                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1482                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1483                                                                         break;
1484                                                         if (clientnum < svs.maxclients && realtime - client->connecttime < net_messagerejointimeout.value)
1485                                                         {
1486                                                                 // client is still trying to connect,
1487                                                                 // so we send a duplicate reply
1488                                                                 if (developer.integer)
1489                                                                         Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1490                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1491                                                         }
1492 #if 0
1493                                                         else if (clientnum < svs.maxclients)
1494                                                         {
1495                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1496                                                                 {
1497                                                                         // client crashed and is coming back, keep their stuff intact
1498                                                                         SV_SendServerinfo(client);
1499                                                                         //host_client = client;
1500                                                                         //SV_DropClient (true);
1501                                                                 }
1502                                                                 // else ignore them
1503                                                         }
1504 #endif
1505                                                         else
1506                                                         {
1507                                                                 // this is a new client, find a slot
1508                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1509                                                                         if (!client->active)
1510                                                                                 break;
1511                                                                 if (clientnum < svs.maxclients)
1512                                                                 {
1513                                                                         // prepare the client struct
1514                                                                         if ((conn = NetConn_Open(mysocket, peeraddress)))
1515                                                                         {
1516                                                                                 // allocated connection
1517                                                                                 LHNETADDRESS_ToString(peeraddress, conn->address, sizeof(conn->address), true);
1518                                                                                 if (developer.integer)
1519                                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1520                                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1521                                                                                 // now set up the client
1522                                                                                 SV_ConnectClient(clientnum, conn);
1523                                                                                 NetConn_Heartbeat(1);
1524                                                                         }
1525                                                                 }
1526                                                                 else
1527                                                                 {
1528                                                                         // server is full
1529                                                                         if (developer.integer)
1530                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1531                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1532                                                                 }
1533                                                         }
1534                                                 }
1535                                         }
1536                                 }
1537                                 return true;
1538                         }
1539                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1540                         {
1541                                 const char *challenge = NULL;
1542
1543                                 // If there was a challenge in the getinfo message
1544                                 if (length > 8 && string[7] == ' ')
1545                                         challenge = string + 8;
1546
1547                                 if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), false))
1548                                 {
1549                                         if (developer.integer)
1550                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1551                                         NetConn_WriteString(mysocket, response, peeraddress);
1552                                 }
1553                                 return true;
1554                         }
1555                         if (length >= 9 && !memcmp(string, "getstatus", 9))
1556                         {
1557                                 const char *challenge = NULL;
1558
1559                                 // If there was a challenge in the getinfo message
1560                                 if (length > 10 && string[9] == ' ')
1561                                         challenge = string + 10;
1562
1563                                 if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), true))
1564                                 {
1565                                         if (developer.integer)
1566                                                 Con_Printf("Sending reply to client %s - %s\n", addressstring2, response);
1567                                         NetConn_WriteString(mysocket, response, peeraddress);
1568                                 }
1569                                 return true;
1570                         }
1571                         /*
1572                         if (!strncmp(string, "ping", 4))
1573                         {
1574                                 if (developer.integer)
1575                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1576                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1577                                 return true;
1578                         }
1579                         if (!strncmp(string, "ack", 3))
1580                                 return true;
1581                         */
1582                         // we may not have liked the packet, but it was a command packet, so
1583                         // we're done processing this packet now
1584                         return true;
1585                 }
1586                 // LordHavoc: disabled netquake control packet support in server
1587 #if 0
1588                 {
1589                         int c, control;
1590                         // netquake control packets, supported for compatibility only
1591                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1592                         {
1593                                 c = data[4];
1594                                 data += 5;
1595                                 length -= 5;
1596                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1597                                 switch (c)
1598                                 {
1599                                 case CCREQ_CONNECT:
1600                                         //if (developer.integer)
1601                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1602                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
1603                                         {
1604                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1605                                                 {
1606                                                         if (developer.integer)
1607                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1608                                                         SZ_Clear(&net_message);
1609                                                         // save space for the header, filled in later
1610                                                         MSG_WriteLong(&net_message, 0);
1611                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1612                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
1613                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1614                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1615                                                         SZ_Clear(&net_message);
1616                                                 }
1617                                                 else
1618                                                 {
1619                                                         // see if this is a duplicate connection request
1620                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1621                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1622                                                                         break;
1623                                                         if (clientnum < svs.maxclients)
1624                                                         {
1625                                                                 // duplicate connection request
1626                                                                 if (realtime - client->connecttime < 2.0)
1627                                                                 {
1628                                                                         // client is still trying to connect,
1629                                                                         // so we send a duplicate reply
1630                                                                         if (developer.integer)
1631                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1632                                                                         SZ_Clear(&net_message);
1633                                                                         // save space for the header, filled in later
1634                                                                         MSG_WriteLong(&net_message, 0);
1635                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1636                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1637                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1638                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1639                                                                         SZ_Clear(&net_message);
1640                                                                 }
1641 #if 0
1642                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1643                                                                 {
1644                                                                         SV_SendServerinfo(client);
1645                                                                         // the old client hasn't sent us anything
1646                                                                         // in quite a while, so kick off and let
1647                                                                         // the retry take care of it...
1648                                                                         //host_client = client;
1649                                                                         //SV_DropClient (true);
1650                                                                 }
1651 #endif
1652                                                         }
1653                                                         else
1654                                                         {
1655                                                                 // this is a new client, find a slot
1656                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1657                                                                         if (!client->active)
1658                                                                                 break;
1659                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
1660                                                                 {
1661                                                                         // connect to the client
1662                                                                         // everything is allocated, just fill in the details
1663                                                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
1664                                                                         if (developer.integer)
1665                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
1666                                                                         // send back the info about the server connection
1667                                                                         SZ_Clear(&net_message);
1668                                                                         // save space for the header, filled in later
1669                                                                         MSG_WriteLong(&net_message, 0);
1670                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1671                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
1672                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1673                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1674                                                                         SZ_Clear(&net_message);
1675                                                                         // now set up the client struct
1676                                                                         SV_ConnectClient(clientnum, conn);
1677                                                                         NetConn_Heartbeat(1);
1678                                                                 }
1679                                                                 else
1680                                                                 {
1681                                                                         //if (developer.integer)
1682                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
1683                                                                         // no room; try to let player know
1684                                                                         SZ_Clear(&net_message);
1685                                                                         // save space for the header, filled in later
1686                                                                         MSG_WriteLong(&net_message, 0);
1687                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1688                                                                         MSG_WriteString(&net_message, "Server is full.\n");
1689                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1690                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1691                                                                         SZ_Clear(&net_message);
1692                                                                 }
1693                                                         }
1694                                                 }
1695                                         }
1696                                         break;
1697 #if 0
1698                                 case CCREQ_SERVER_INFO:
1699                                         if (developer.integer)
1700                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
1701                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
1702                                         {
1703                                                 if (developer.integer)
1704                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
1705                                                 SZ_Clear(&net_message);
1706                                                 // save space for the header, filled in later
1707                                                 MSG_WriteLong(&net_message, 0);
1708                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1709                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1710                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1711                                                 MSG_WriteString(&net_message, hostname.string);
1712                                                 MSG_WriteString(&net_message, sv.name);
1713                                                 MSG_WriteByte(&net_message, net_activeconnections);
1714                                                 MSG_WriteByte(&net_message, svs.maxclients);
1715                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1716                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1717                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1718                                                 SZ_Clear(&net_message);
1719                                         }
1720                                         break;
1721                                 case CCREQ_PLAYER_INFO:
1722                                         if (developer.integer)
1723                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1724                                         if (sv.active)
1725                                         {
1726                                                 int playerNumber, activeNumber, clientNumber;
1727                                                 client_t *client;
1728
1729                                                 playerNumber = MSG_ReadByte();
1730                                                 activeNumber = -1;
1731                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1732                                                         if (client->active && ++activeNumber == playerNumber)
1733                                                                 break;
1734                                                 if (clientNumber != svs.maxclients)
1735                                                 {
1736                                                         SZ_Clear(&net_message);
1737                                                         // save space for the header, filled in later
1738                                                         MSG_WriteLong(&net_message, 0);
1739                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1740                                                         MSG_WriteByte(&net_message, playerNumber);
1741                                                         MSG_WriteString(&net_message, client->name);
1742                                                         MSG_WriteLong(&net_message, client->colors);
1743                                                         MSG_WriteLong(&net_message, (int)client->edict->fields.server->frags);
1744                                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
1745                                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
1746                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1747                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1748                                                         SZ_Clear(&net_message);
1749                                                 }
1750                                         }
1751                                         break;
1752                                 case CCREQ_RULE_INFO:
1753                                         if (developer.integer)
1754                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1755                                         if (sv.active)
1756                                         {
1757                                                 char *prevCvarName;
1758                                                 cvar_t *var;
1759
1760                                                 // find the search start location
1761                                                 prevCvarName = MSG_ReadString();
1762                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1763
1764                                                 // send the response
1765                                                 SZ_Clear(&net_message);
1766                                                 // save space for the header, filled in later
1767                                                 MSG_WriteLong(&net_message, 0);
1768                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1769                                                 if (var)
1770                                                 {
1771                                                         MSG_WriteString(&net_message, var->name);
1772                                                         MSG_WriteString(&net_message, var->string);
1773                                                 }
1774                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1775                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1776                                                 SZ_Clear(&net_message);
1777                                         }
1778                                         break;
1779 #endif
1780                                 default:
1781                                         break;
1782                                 }
1783                                 // we may not have liked the packet, but it was a valid control
1784                                 // packet, so we're done processing this packet now
1785                                 return true;
1786                         }
1787                 }
1788 #endif
1789                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1790                 {
1791                         if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1792                         {
1793                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1794                                         SV_ReadClientMessage();
1795                                 return ret;
1796                         }
1797                 }
1798         }
1799         return 0;
1800 }
1801
1802 void NetConn_ServerFrame(void)
1803 {
1804         int i, length;
1805         lhnetaddress_t peeraddress;
1806         netconn_t *conn;
1807         NetConn_UpdateServerStuff();
1808         for (i = 0;i < sv_numsockets;i++)
1809                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1810                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1811         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1812         {
1813                 // never timeout loopback connections
1814                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
1815                 {
1816                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1817                         SV_DropClient(false);
1818                 }
1819         }
1820         for (conn = netconn_list;conn;conn = conn->next)
1821                 NetConn_ReSendMessage(conn);
1822 }
1823
1824 void NetConn_QueryMasters(void)
1825 {
1826         int i;
1827         int masternum;
1828         lhnetaddress_t masteraddress;
1829         lhnetaddress_t broadcastaddress;
1830         char request[256];
1831
1832         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
1833                 return;
1834
1835         // 26000 is the default quake server port, servers on other ports will not
1836         // be found
1837         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
1838         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
1839
1840         for (i = 0;i < cl_numsockets;i++)
1841         {
1842                 if (cl_sockets[i])
1843                 {
1844                         // search LAN for Quake servers
1845                         SZ_Clear(&net_message);
1846                         // save space for the header, filled in later
1847                         MSG_WriteLong(&net_message, 0);
1848                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1849                         MSG_WriteString(&net_message, "QUAKE");
1850                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1851                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1852                         NetConn_Write(cl_sockets[i], net_message.data, net_message.cursize, &broadcastaddress);
1853                         SZ_Clear(&net_message);
1854
1855                         // search LAN for DarkPlaces servers
1856                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377getinfo", &broadcastaddress);
1857
1858                         // build the getservers message to send to the master servers
1859                         dpsnprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1860
1861                         // search internet
1862                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1863                         {
1864                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1865                                 {
1866                                         masterquerycount++;
1867                                         NetConn_WriteString(cl_sockets[i], request, &masteraddress);
1868                                 }
1869                         }
1870                 }
1871         }
1872         if (!masterquerycount)
1873         {
1874                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
1875                 M_Update_Return_Reason("No network");
1876         }
1877 }
1878
1879 void NetConn_Heartbeat(int priority)
1880 {
1881         lhnetaddress_t masteraddress;
1882         int masternum;
1883         lhnetsocket_t *mysocket;
1884
1885         // if it's a state change (client connected), limit next heartbeat to no
1886         // more than 30 sec in the future
1887         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1888                 nextheartbeattime = realtime + 30.0;
1889
1890         // limit heartbeatperiod to 30 to 270 second range,
1891         // lower limit is to avoid abusing master servers with excess traffic,
1892         // upper limit is to avoid timing out on the master server (which uses
1893         // 300 sec timeout)
1894         if (sv_heartbeatperiod.value < 30)
1895                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1896         if (sv_heartbeatperiod.value > 270)
1897                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1898
1899         // make advertising optional and don't advertise singleplayer games, and
1900         // only send a heartbeat as often as the admin wants
1901         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1902         {
1903                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1904                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1905                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1906                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
1907         }
1908 }
1909
1910 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1911 {
1912         int i, count = 0;
1913         qbyte sent[MAX_SCOREBOARD];
1914
1915         memset(sent, 0, sizeof(sent));
1916
1917         // simultaneously wait for the first CanSendMessage and send the message,
1918         // then wait for a second CanSendMessage (verifying it was received), or
1919         // the client drops and is no longer counted
1920         // the loop aborts when either it runs out of clients to send to, or a
1921         // timeout expires
1922         blocktime += Sys_DoubleTime();
1923         do
1924         {
1925                 count = 0;
1926                 NetConn_ClientFrame();
1927                 NetConn_ServerFrame();
1928                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1929                 {
1930                         if (host_client->netconnection)
1931                         {
1932                                 if (NetConn_CanSendMessage(host_client->netconnection))
1933                                 {
1934                                         if (!sent[i])
1935                                                 NetConn_SendReliableMessage(host_client->netconnection, data);
1936                                         sent[i] = true;
1937                                 }
1938                                 if (!NetConn_CanSendMessage(host_client->netconnection))
1939                                         count++;
1940                         }
1941                 }
1942         }
1943         while (count && Sys_DoubleTime() < blocktime);
1944         return count;
1945 }
1946
1947 static void Net_Heartbeat_f(void)
1948 {
1949         if (sv.active)
1950                 NetConn_Heartbeat(2);
1951         else
1952                 Con_Print("No server running, can not heartbeat to master server.\n");
1953 }
1954
1955 void PrintStats(netconn_t *conn)
1956 {
1957         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1958 }
1959
1960 void Net_Stats_f(void)
1961 {
1962         netconn_t *conn;
1963         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1964         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1965         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1966         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1967         Con_Printf("packetsSent                = %i\n", packetsSent);
1968         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1969         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1970         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1971         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1972         Con_Print("connections                =\n");
1973         for (conn = netconn_list;conn;conn = conn->next)
1974                 PrintStats(conn);
1975 }
1976
1977 void Net_Slist_f(void)
1978 {
1979         ServerList_ResetMasks();
1980         serverlist_sortbyfield = SLIF_PING;
1981         serverlist_sortdescending = false;
1982     if (m_state != m_slist) {
1983                 Con_Print("Sending requests to master servers\n");
1984                 ServerList_QueryList();
1985                 serverlist_consoleoutput = true;
1986                 Con_Print("Listening for replies...\n");
1987         } else
1988                 ServerList_QueryList();
1989 }
1990
1991 void NetConn_Init(void)
1992 {
1993         int i;
1994         lhnetaddress_t tempaddress;
1995         netconn_mempool = Mem_AllocPool("network connections", 0, NULL);
1996         Cmd_AddCommand("net_stats", Net_Stats_f);
1997         Cmd_AddCommand("net_slist", Net_Slist_f);
1998         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
1999         Cvar_RegisterVariable(&net_slist_queriespersecond);
2000         Cvar_RegisterVariable(&net_slist_queriesperframe);
2001         Cvar_RegisterVariable(&net_slist_timeout);
2002         Cvar_RegisterVariable(&net_slist_maxtries);
2003         Cvar_RegisterVariable(&net_messagetimeout);
2004         Cvar_RegisterVariable(&net_messagerejointimeout);
2005         Cvar_RegisterVariable(&net_connecttimeout);
2006         Cvar_RegisterVariable(&cl_netlocalping);
2007         Cvar_RegisterVariable(&cl_netpacketloss);
2008         Cvar_RegisterVariable(&hostname);
2009         Cvar_RegisterVariable(&developer_networking);
2010         Cvar_RegisterVariable(&cl_netport);
2011         Cvar_RegisterVariable(&sv_netport);
2012         Cvar_RegisterVariable(&net_address);
2013         //Cvar_RegisterVariable(&net_address_ipv6);
2014         Cvar_RegisterVariable(&sv_public);
2015         Cvar_RegisterVariable(&sv_heartbeatperiod);
2016         for (i = 0;sv_masters[i].name;i++)
2017                 Cvar_RegisterVariable(&sv_masters[i]);
2018 // 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.
2019         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
2020         {
2021                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
2022                 {
2023                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
2024                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
2025                 }
2026                 else
2027                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
2028         }
2029 // 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
2030         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
2031         {
2032                 i = atoi(com_argv[i + 1]);
2033                 if (i >= 0 && i < 65536)
2034                 {
2035                         Con_Printf("-port option used, setting port cvar to %i\n", i);
2036                         Cvar_SetValueQuick(&sv_netport, i);
2037                 }
2038                 else
2039                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
2040         }
2041         cl_numsockets = 0;
2042         sv_numsockets = 0;
2043         net_message.data = net_message_buf;
2044         net_message.maxsize = sizeof(net_message_buf);
2045         net_message.cursize = 0;
2046         LHNET_Init();
2047 }
2048
2049 void NetConn_Shutdown(void)
2050 {
2051         NetConn_CloseClientPorts();
2052         NetConn_CloseServerPorts();
2053         LHNET_Shutdown();
2054 }
2055