netconn.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3 Copyright (C) 2002 Mathieu Olivier
   4 Copyright (C) 2003 Forest Hale
   5
   6 This program is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public License
   8 as published by the Free Software Foundation; either version 2
   9 of the License, or (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14
  15 See the GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20
  21 */
  22
  23 #include "quakedef.h"
  24 #include "lhnet.h"
  25
  26 #define MASTER_PORT 27950
  27
  28 cvar_t sv_public = {0, "sv_public", "1"};
  29 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "180"};
  30
  31 // FIXME: resolve DNS on masters whenever their value changes and cache it (to avoid major delays in active servers when they heartbeat)
  32 static cvar_t sv_masters [] =
  33 {
  34         {CVAR_SAVE, "sv_master1", ""},
  35         {CVAR_SAVE, "sv_master2", ""},
  36         {CVAR_SAVE, "sv_master3", ""},
  37         {CVAR_SAVE, "sv_master4", ""},
  38         {0, "sv_masterextra1", "69.59.212.88"}, // ghdigital.com
  39         {0, "sv_masterextra2", "66.169.205.13"}, // dpmaster.deathmask.net
  40         {0, "sv_masterextra3", "12.166.196.192"}, // blaze.mindphukd.org
  41         {0, NULL, NULL}
  42 };
  43
  44 static double nextheartbeattime = 0;
  45
  46 sizebuf_t net_message;
  47
  48 cvar_t net_messagetimeout = {0, "net_messagetimeout","300"};
  49 cvar_t net_messagerejointimeout = {0, "net_messagerejointimeout","10"};
  50 cvar_t net_connecttimeout = {0, "net_connecttimeout","10"};
  51 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED"};
  52 cvar_t developer_networking = {0, "developer_networking", "0"};
  53
  54 cvar_t cl_netlocalping = {0, "cl_netlocalping","0"};
  55 static cvar_t cl_netpacketloss = {0, "cl_netpacketloss","0"};
  56
  57
  58 /* statistic counters */
  59 static int packetsSent = 0;
  60 static int packetsReSent = 0;
  61 static int packetsReceived = 0;
  62 static int receivedDuplicateCount = 0;
  63 static int droppedDatagrams = 0;
  64
  65 static int unreliableMessagesSent = 0;
  66 static int unreliableMessagesReceived = 0;
  67 static int reliableMessagesSent = 0;
  68 static int reliableMessagesReceived = 0;
  69
  70 double masterquerytime = -1000;
  71 int masterquerycount = 0;
  72 int masterreplycount = 0;
  73 int serverquerycount = 0;
  74 int serverreplycount = 0;
  75
  76 static qbyte sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  77 static qbyte readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  78
  79 int cl_numsockets;
  80 lhnetsocket_t *cl_sockets[16];
  81 int sv_numsockets;
  82 lhnetsocket_t *sv_sockets[16];
  83
  84 netconn_t *netconn_list = NULL;
  85 mempool_t *netconn_mempool = NULL;
  86
  87 cvar_t cl_netport = {0, "cl_port", "0"};
  88 cvar_t sv_netport = {0, "port", "26000"};
  89 cvar_t net_address = {0, "net_address", "0.0.0.0"};
  90 //cvar_t net_netaddress_ipv6 = {0, "net_address_ipv6", "[0:0:0:0:0:0:0:0]"};
  91
  92 // ServerList interface
  93 serverlist_mask_t serverlist_andmasks[SERVERLIST_ANDMASKCOUNT];
  94 serverlist_mask_t serverlist_ormasks[SERVERLIST_ORMASKCOUNT];
  95
  96 serverlist_infofield_t serverlist_sortbyfield;
  97 qboolean serverlist_sortdescending;
  98
  99 int serverlist_viewcount = 0;
 100 serverlist_entry_t *serverlist_viewlist[SERVERLIST_VIEWLISTSIZE];
 101
 102 int serverlist_cachecount;
 103 serverlist_entry_t serverlist_cache[SERVERLIST_TOTALSIZE];
 104
 105 qboolean serverlist_consoleoutput;
 106
 107 // helper function to insert a value into the viewset
 108 // spare entries will be removed
 109 static void _ServerList_ViewList_Helper_InsertBefore( int index, serverlist_entry_t *entry )
 110 {
 111     int i;
 112         if( serverlist_viewcount == SERVERLIST_VIEWLISTSIZE )
 113                 return;
 114
 115         for( i = serverlist_viewcount ; i > index ; i-- )
 116                 serverlist_viewlist[ i ] = serverlist_viewlist[ i - 1 ];
 117
 118         serverlist_viewlist[index] = entry;
 119         serverlist_viewcount++;
 120 }
 121
 122 // we suppose serverlist_viewcount to be valid, ie > 0
 123 static void _ServerList_ViewList_Helper_Remove( int index )
 124 {
 125         serverlist_viewcount--;
 126         for( ; index < serverlist_viewcount ; index++ )
 127                 serverlist_viewlist[index] = serverlist_viewlist[index + 1];
 128 }
 129
 130 // returns true if A should be inserted before B
 131 static qboolean _ServerList_Entry_Compare( serverlist_entry_t *A, serverlist_entry_t *B )
 132 {
 133         int result = 0; // > 0 if for numbers A > B and for text if A < B
 134
 135         if( serverlist_sortbyfield == SLIF_PING )
 136                 result = A->info.ping - B->info.ping;
 137         else if( serverlist_sortbyfield == SLIF_MAXPLAYERS )
 138                 result = A->info.maxplayers - B->info.maxplayers;
 139         else if( serverlist_sortbyfield == SLIF_NUMPLAYERS )
 140                 result = A->info.numplayers - B->info.numplayers;
 141         else if( serverlist_sortbyfield == SLIF_PROTOCOL )
 142                 result = A->info.protocol - B->info.protocol;
 143         else if( serverlist_sortbyfield == SLIF_CNAME )
 144                 result = strcmp( B->info.cname, A->info.cname );
 145         else if( serverlist_sortbyfield == SLIF_GAME )
 146                 result = strcmp( B->info.game, A->info.game );
 147         else if( serverlist_sortbyfield == SLIF_MAP )
 148                 result = strcmp( B->info.map, A->info.map );
 149         else if( serverlist_sortbyfield == SLIF_MOD )
 150                 result = strcmp( B->info.mod, A->info.mod );
 151         else if( serverlist_sortbyfield == SLIF_NAME )
 152                 result = strcmp( B->info.name, A->info.name );
 153
 154         if( serverlist_sortdescending )
 155                 return result > 0;
 156         return result < 0;
 157 }
 158
 159 static qboolean _ServerList_CompareInt( int A, serverlist_maskop_t op, int B )
 160 {
 161         if( op == SLMO_LESS )
 162                 return A < B;
 163         else if( op == SLMO_LESSEQUAL )
 164                 return A <= B;
 165         else if( op == SLMO_EQUAL )
 166                 return A == B;
 167         else if( op == SLMO_GREATER )
 168                 return A > B;
 169         else if( op == SLMO_NOTEQUAL )
 170                 return A != B;
 171         else // SLMO_GREATEREQUAL
 172                 return A >= B;
 173 }
 174
 175 static qboolean _ServerList_CompareStr( const char *A, serverlist_maskop_t op, const char *B )
 176 {
 177         if( op == SLMO_CONTAINS ) // A info B mask
 178                 return *B && !!strstr( A, B ); // we want a real bool
 179         else if( op == SLMO_NOTCONTAIN )
 180                 return !*B || !strstr( A, B );
 181         else if( op == SLMO_LESS )
 182                 return strcmp( A, B ) < 0;
 183         else if( op == SLMO_LESSEQUAL )
 184                 return strcmp( A, B ) <= 0;
 185         else if( op == SLMO_EQUAL )
 186                 return strcmp( A, B ) == 0;
 187         else if( op == SLMO_GREATER )
 188                 return strcmp( A, B ) > 0;
 189         else if( op == SLMO_NOTEQUAL )
 190                 return strcmp( A, B ) != 0;
 191         else // SLMO_GREATEREQUAL
 192                 return strcmp( A, B ) >= 0;
 193 }
 194
 195 static qboolean _ServerList_Entry_Mask( serverlist_mask_t *mask, serverlist_info_t *info )
 196 {
 197         if( !_ServerList_CompareInt( info->ping, mask->tests[SLIF_PING], mask->info.ping ) )
 198                 return false;
 199         if( !_ServerList_CompareInt( info->maxplayers, mask->tests[SLIF_MAXPLAYERS], mask->info.maxplayers ) )
 200                 return false;
 201         if( !_ServerList_CompareInt( info->numplayers, mask->tests[SLIF_NUMPLAYERS], mask->info.numplayers ) )
 202                 return false;
 203         if( !_ServerList_CompareInt( info->protocol, mask->tests[SLIF_PROTOCOL], mask->info.protocol ))
 204                 return false;
 205         if( *mask->info.cname
 206                 && !_ServerList_CompareStr( info->cname, mask->tests[SLIF_CNAME], mask->info.cname ) )
 207                 return false;
 208         if( *mask->info.game
 209                 && !_ServerList_CompareStr( info->game, mask->tests[SLIF_GAME], mask->info.game ) )
 210                 return false;
 211         if( *mask->info.mod
 212                 && !_ServerList_CompareStr( info->mod, mask->tests[SLIF_MOD], mask->info.mod ) )
 213                 return false;
 214         if( *mask->info.map
 215                 && !_ServerList_CompareStr( info->map, mask->tests[SLIF_MAP], mask->info.map ) )
 216                 return false;
 217         if( *mask->info.name
 218                 && !_ServerList_CompareStr( info->name, mask->tests[SLIF_NAME], mask->info.name ) )
 219                 return false;
 220         return true;
 221 }
 222
 223 static void ServerList_ViewList_Insert( serverlist_entry_t *entry )
 224 {
 225         int start, end, mid;
 226
 227         if( serverlist_viewcount == SERVERLIST_VIEWLISTSIZE )
 228                 return;
 229
 230         // now check whether it passes through the masks
 231         for( start = 0 ; serverlist_andmasks[start].active && start < SERVERLIST_ANDMASKCOUNT ; start++ )
 232                 if( !_ServerList_Entry_Mask( &serverlist_andmasks[start], &entry->info ) )
 233                         return;
 234
 235         for( start = 0 ; serverlist_ormasks[start].active && start < SERVERLIST_ORMASKCOUNT ; start++ )
 236                 if( _ServerList_Entry_Mask( &serverlist_ormasks[start], &entry->info ) )
 237                         break;
 238         if( start == SERVERLIST_ORMASKCOUNT || (start > 0 && !serverlist_ormasks[start].active) )
 239                 return;
 240
 241         if( !serverlist_viewcount ) {
 242                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 243                 return;
 244         }
 245         // ok, insert it, we just need to find out where exactly:
 246
 247         // two special cases
 248         // check whether to insert it as new first item
 249         if( _ServerList_Entry_Compare( entry, serverlist_viewlist[0] ) ) {
 250                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 251                 return;
 252         } // check whether to insert it as new last item
 253         else if( !_ServerList_Entry_Compare( entry, serverlist_viewlist[serverlist_viewcount - 1] ) ) {
 254                 _ServerList_ViewList_Helper_InsertBefore( serverlist_viewcount, entry );
 255                 return;
 256         }
 257         start = 0;
 258         end = serverlist_viewcount - 1;
 259         while( end > start + 1 )
 260         {
 261                 mid = (start + end) / 2;
 262                 // test the item that lies in the middle between start and end
 263                 if( _ServerList_Entry_Compare( entry, serverlist_viewlist[mid] ) )
 264                         // the item has to be in the upper half
 265                         end = mid;
 266                 else
 267                         // the item has to be in the lower half
 268                         start = mid;
 269         }
 270         _ServerList_ViewList_Helper_InsertBefore( start + 1, entry );
 271 }
 272
 273 static void ServerList_ViewList_Remove( serverlist_entry_t *entry )
 274 {
 275         int i;
 276         for( i = 0; i < serverlist_viewcount; i++ )
 277         {
 278                 if (serverlist_viewlist[i] == entry)
 279                 {
 280                         _ServerList_ViewList_Helper_Remove(i);
 281                         break;
 282                 }
 283         }
 284 }
 285
 286 void ServerList_RebuildViewList(void)
 287 {
 288         int i;
 289
 290         serverlist_viewcount = 0;
 291         for( i = 0 ; i < serverlist_cachecount ; i++ )
 292                 if( serverlist_cache[i].finished )
 293                         ServerList_ViewList_Insert( &serverlist_cache[i] );
 294 }
 295
 296 void ServerList_ResetMasks(void)
 297 {
 298         memset( &serverlist_andmasks, 0, sizeof( serverlist_andmasks ) );
 299         memset( &serverlist_ormasks, 0, sizeof( serverlist_ormasks ) );
 300 }
 301
 302 #if 0
 303 static void _ServerList_Test(void)
 304 {
 305         int i;
 306         for( i = 0 ; i < 1024 ; i++ ) {
 307                 memset( &serverlist_cache[serverlist_cachecount], 0, sizeof( serverlist_t ) );
 308                 serverlist_cache[serverlist_cachecount].info.ping = rand() % 450 + 250;
 309                 dpsnprintf( serverlist_cache[serverlist_cachecount].info.name, 128, "Black's ServerList Test %i", i );
 310                 serverlist_cache[serverlist_cachecount].finished = true;
 311                 sprintf( serverlist_cache[serverlist_cachecount].line1, "%i %s", serverlist_cache[serverlist_cachecount].info.ping, serverlist_cache[serverlist_cachecount].info.name );
 312                 ServerList_ViewList_Insert( &serverlist_cache[serverlist_cachecount] );
 313                 serverlist_cachecount++;
 314         }
 315 }
 316 #endif
 317
 318 void ServerList_QueryList(void)
 319 {
 320         masterquerytime = realtime;
 321         masterquerycount = 0;
 322         masterreplycount = 0;
 323         serverquerycount = 0;
 324         serverreplycount = 0;
 325         serverlist_cachecount = 0;
 326         serverlist_viewcount = 0;
 327         serverlist_consoleoutput = false;
 328         NetConn_QueryMasters();
 329
 330         //_ServerList_Test();
 331 }
 332
 333 // rest
 334
 335 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
 336 {
 337         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
 338         int i;
 339         if (length == 0)
 340                 return 0;
 341         if (cl_netpacketloss.integer)
 342                 for (i = 0;i < cl_numsockets;i++)
 343                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 344                                 return 0;
 345         if (developer_networking.integer)
 346         {
 347                 char addressstring[128], addressstring2[128];
 348                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 349                 if (length > 0)
 350                 {
 351                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 352                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
 353                         Com_HexDumpToConsole(data, length);
 354                 }
 355                 else
 356                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
 357         }
 358         return length;
 359 }
 360
 361 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 362 {
 363         int ret;
 364         int i;
 365         if (cl_netpacketloss.integer)
 366                 for (i = 0;i < cl_numsockets;i++)
 367                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 368                                 return length;
 369         ret = LHNET_Write(mysocket, data, length, peeraddress);
 370         if (developer_networking.integer)
 371         {
 372                 char addressstring[128], addressstring2[128];
 373                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 374                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 375                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 376                 Com_HexDumpToConsole(data, length);
 377         }
 378         return ret;
 379 }
 380
 381 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 382 {
 383         // note this does not include the trailing NULL because we add that in the parser
 384         return NetConn_Write(mysocket, string, strlen(string), peeraddress);
 385 }
 386
 387 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
 388 {
 389         unsigned int packetLen;
 390         unsigned int dataLen;
 391         unsigned int eom;
 392         unsigned int *header;
 393
 394 //#ifdef DEBUG
 395         if (data->cursize == 0)
 396                 Sys_Error("Datagram_SendMessage: zero length message\n");
 397
 398         if (data->cursize > (int)sizeof(conn->sendMessage))
 399                 Sys_Error("Datagram_SendMessage: message too big (%u > %u)\n", data->cursize, sizeof(conn->sendMessage));
 400
 401         if (conn->canSend == false)
 402                 Sys_Error("SendMessage: called with canSend == false\n");
 403 //#endif
 404
 405         memcpy(conn->sendMessage, data->data, data->cursize);
 406         conn->sendMessageLength = data->cursize;
 407
 408         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 409         {
 410                 dataLen = conn->sendMessageLength;
 411                 eom = NETFLAG_EOM;
 412         }
 413         else
 414         {
 415                 dataLen = MAX_PACKETFRAGMENT;
 416                 eom = 0;
 417         }
 418
 419         packetLen = NET_HEADERSIZE + dataLen;
 420
 421         header = (void *)sendbuffer;
 422         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 423         header[1] = BigLong(conn->sendSequence);
 424         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 425
 426         conn->sendSequence++;
 427         conn->canSend = false;
 428
 429         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 430                 return -1;
 431
 432         conn->lastSendTime = realtime;
 433         packetsSent++;
 434         reliableMessagesSent++;
 435         return 1;
 436 }
 437
 438 static void NetConn_SendMessageNext(netconn_t *conn)
 439 {
 440         unsigned int packetLen;
 441         unsigned int dataLen;
 442         unsigned int eom;
 443         unsigned int *header;
 444
 445         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
 446         {
 447                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 448                 {
 449                         dataLen = conn->sendMessageLength;
 450                         eom = NETFLAG_EOM;
 451                 }
 452                 else
 453                 {
 454                         dataLen = MAX_PACKETFRAGMENT;
 455                         eom = 0;
 456                 }
 457
 458                 packetLen = NET_HEADERSIZE + dataLen;
 459
 460                 header = (void *)sendbuffer;
 461                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 462                 header[1] = BigLong(conn->sendSequence);
 463                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 464
 465                 conn->sendSequence++;
 466                 conn->sendNext = false;
 467
 468                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 469                         return;
 470
 471                 conn->lastSendTime = realtime;
 472                 packetsSent++;
 473         }
 474 }
 475
 476 static void NetConn_ReSendMessage(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 && (realtime - conn->lastSendTime) > 1.0)
 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 - 1);
 501                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 502
 503                 conn->sendNext = false;
 504
 505                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 506                         return;
 507
 508                 conn->lastSendTime = realtime;
 509                 packetsReSent++;
 510         }
 511 }
 512
 513 qboolean NetConn_CanSendMessage(netconn_t *conn)
 514 {
 515         return conn->canSend;
 516 }
 517
 518 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
 519 {
 520         int packetLen;
 521         int *header;
 522
 523         packetLen = NET_HEADERSIZE + data->cursize;
 524
 525 //#ifdef DEBUG
 526         if (data->cursize == 0)
 527                 Sys_Error("Datagram_SendUnreliableMessage: zero length message\n");
 528
 529         if (packetLen > (int)sizeof(sendbuffer))
 530                 Sys_Error("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
 531 //#endif
 532
 533         header = (void *)sendbuffer;
 534         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
 535         header[1] = BigLong(conn->unreliableSendSequence);
 536         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
 537
 538         conn->unreliableSendSequence++;
 539
 540         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 541                 return -1;
 542
 543         packetsSent++;
 544         unreliableMessagesSent++;
 545         return 1;
 546 }
 547
 548 void NetConn_CloseClientPorts(void)
 549 {
 550         for (;cl_numsockets > 0;cl_numsockets--)
 551                 if (cl_sockets[cl_numsockets - 1])
 552                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 553 }
 554
 555 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
 556 {
 557         lhnetaddress_t address;
 558         lhnetsocket_t *s;
 559         char addressstring2[1024];
 560         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 561         {
 562                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 563                 {
 564                         cl_sockets[cl_numsockets++] = s;
 565                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 566                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
 567                 }
 568                 else
 569                 {
 570                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 571                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
 572                 }
 573         }
 574         else
 575                 Con_Printf("Client unable to parse address %s\n", addressstring);
 576 }
 577
 578 void NetConn_OpenClientPorts(void)
 579 {
 580         int port;
 581         NetConn_CloseClientPorts();
 582         port = bound(0, cl_netport.integer, 65535);
 583         if (cl_netport.integer != port)
 584                 Cvar_SetValueQuick(&cl_netport, port);
 585         Con_Printf("Client using port %i\n", port);
 586         NetConn_OpenClientPort("local:2", 0);
 587         NetConn_OpenClientPort(net_address.string, port);
 588         //NetConn_OpenClientPort(net_address_ipv6.string, port);
 589 }
 590
 591 void NetConn_CloseServerPorts(void)
 592 {
 593         for (;sv_numsockets > 0;sv_numsockets--)
 594                 if (sv_sockets[sv_numsockets - 1])
 595                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 596 }
 597
 598 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
 599 {
 600         lhnetaddress_t address;
 601         lhnetsocket_t *s;
 602         char addressstring2[1024];
 603         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 604         {
 605                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 606                 {
 607                         sv_sockets[sv_numsockets++] = s;
 608                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 609                         Con_Printf("Server listening on address %s\n", addressstring2);
 610                 }
 611                 else
 612                 {
 613                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 614                         Con_Printf("Server failed to open socket on address %s\n", addressstring2);
 615                 }
 616         }
 617         else
 618                 Con_Printf("Server unable to parse address %s\n", addressstring);
 619 }
 620
 621 void NetConn_OpenServerPorts(int opennetports)
 622 {
 623         int port;
 624         NetConn_CloseServerPorts();
 625         port = bound(0, sv_netport.integer, 65535);
 626         if (port == 0)
 627                 port = 26000;
 628         Con_Printf("Server using port %i\n", port);
 629         if (sv_netport.integer != port)
 630                 Cvar_SetValueQuick(&sv_netport, port);
 631         if (cls.state != ca_dedicated)
 632                 NetConn_OpenServerPort("local:1", 0);
 633         if (opennetports)
 634         {
 635                 NetConn_OpenServerPort(net_address.string, port);
 636                 //NetConn_OpenServerPort(net_address_ipv6.string, port);
 637         }
 638         if (sv_numsockets == 0)
 639                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!\n");
 640 }
 641
 642 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 643 {
 644         int i, a = LHNETADDRESS_GetAddressType(address);
 645         for (i = 0;i < cl_numsockets;i++)
 646                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 647                         return cl_sockets[i];
 648         return NULL;
 649 }
 650
 651 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 652 {
 653         int i, a = LHNETADDRESS_GetAddressType(address);
 654         for (i = 0;i < sv_numsockets;i++)
 655                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 656                         return sv_sockets[i];
 657         return NULL;
 658 }
 659
 660 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 661 {
 662         netconn_t *conn;
 663         conn = Mem_Alloc(netconn_mempool, sizeof(*conn));
 664         conn->mysocket = mysocket;
 665         conn->peeraddress = *peeraddress;
 666         conn->canSend = true;
 667         conn->lastMessageTime = realtime;
 668         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
 669         // reduce effectiveness of connection request floods
 670         conn->timeout = realtime + net_connecttimeout.value;
 671         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
 672         conn->next = netconn_list;
 673         netconn_list = conn;
 674         return conn;
 675 }
 676
 677 void NetConn_Close(netconn_t *conn)
 678 {
 679         netconn_t *c;
 680         // remove connection from list
 681         if (conn == netconn_list)
 682                 netconn_list = conn->next;
 683         else
 684         {
 685                 for (c = netconn_list;c;c = c->next)
 686                 {
 687                         if (c->next == conn)
 688                         {
 689                                 c->next = conn->next;
 690                                 break;
 691                         }
 692                 }
 693                 // not found in list, we'll avoid crashing here...
 694                 if (!c)
 695                         return;
 696         }
 697         // free connection
 698         Mem_Free(conn);
 699 }
 700
 701 static int clientport = -1;
 702 static int clientport2 = -1;
 703 static int hostport = -1;
 704 static void NetConn_UpdateServerStuff(void)
 705 {
 706         if (cls.state != ca_dedicated)
 707         {
 708                 if (clientport2 != cl_netport.integer)
 709                 {
 710                         clientport2 = cl_netport.integer;
 711                         if (cls.state == ca_connected)
 712                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
 713                 }
 714                 if (cls.state == ca_disconnected && clientport != clientport2)
 715                 {
 716                         clientport = clientport2;
 717                         NetConn_CloseClientPorts();
 718                 }
 719                 if (cl_numsockets == 0)
 720                         NetConn_OpenClientPorts();
 721         }
 722
 723         if (hostport != sv_netport.integer)
 724         {
 725                 hostport = sv_netport.integer;
 726                 if (sv.active)
 727                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
 728         }
 729 }
 730
 731 int NetConn_ReceivedMessage(netconn_t *conn, qbyte *data, int length)
 732 {
 733         unsigned int count;
 734         unsigned int flags;
 735         unsigned int sequence;
 736
 737         if (length >= 8)
 738         {
 739                 length = BigLong(((int *)data)[0]);
 740                 flags = length & ~NETFLAG_LENGTH_MASK;
 741                 length &= NETFLAG_LENGTH_MASK;
 742                 // control packets were already handled
 743                 if (!(flags & NETFLAG_CTL))
 744                 {
 745                         sequence = BigLong(((int *)data)[1]);
 746                         packetsReceived++;
 747                         data += 8;
 748                         length -= 8;
 749                         if (flags & NETFLAG_UNRELIABLE)
 750                         {
 751                                 if (sequence >= conn->unreliableReceiveSequence)
 752                                 {
 753                                         if (sequence > conn->unreliableReceiveSequence)
 754                                         {
 755                                                 count = sequence - conn->unreliableReceiveSequence;
 756                                                 droppedDatagrams += count;
 757                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
 758                                         }
 759                                         conn->unreliableReceiveSequence = sequence + 1;
 760                                         conn->lastMessageTime = realtime;
 761                                         conn->timeout = realtime + net_messagetimeout.value;
 762                                         unreliableMessagesReceived++;
 763                                         if (length > 0)
 764                                         {
 765                                                 SZ_Clear(&net_message);
 766                                                 SZ_Write(&net_message, data, length);
 767                                                 MSG_BeginReading();
 768                                                 return 2;
 769                                         }
 770                                 }
 771                                 else
 772                                         Con_DPrint("Got a stale datagram\n");
 773                                 return 1;
 774                         }
 775                         else if (flags & NETFLAG_ACK)
 776                         {
 777                                 if (sequence == (conn->sendSequence - 1))
 778                                 {
 779                                         if (sequence == conn->ackSequence)
 780                                         {
 781                                                 conn->ackSequence++;
 782                                                 if (conn->ackSequence != conn->sendSequence)
 783                                                         Con_DPrint("ack sequencing error\n");
 784                                                 conn->lastMessageTime = realtime;
 785                                                 conn->timeout = realtime + net_messagetimeout.value;
 786                                                 conn->sendMessageLength -= MAX_PACKETFRAGMENT;
 787                                                 if (conn->sendMessageLength > 0)
 788                                                 {
 789                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
 790                                                         conn->sendNext = true;
 791                                                         NetConn_SendMessageNext(conn);
 792                                                 }
 793                                                 else
 794                                                 {
 795                                                         conn->sendMessageLength = 0;
 796                                                         conn->canSend = true;
 797                                                 }
 798                                         }
 799                                         else
 800                                                 Con_DPrint("Duplicate ACK received\n");
 801                                 }
 802                                 else
 803                                         Con_DPrint("Stale ACK received\n");
 804                                 return 1;
 805                         }
 806                         else if (flags & NETFLAG_DATA)
 807                         {
 808                                 unsigned int temppacket[2];
 809                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
 810                                 temppacket[1] = BigLong(sequence);
 811                                 NetConn_Write(conn->mysocket, (qbyte *)temppacket, 8, &conn->peeraddress);
 812                                 if (sequence == conn->receiveSequence)
 813                                 {
 814                                         conn->lastMessageTime = realtime;
 815                                         conn->timeout = realtime + net_messagetimeout.value;
 816                                         conn->receiveSequence++;
 817                                         memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
 818                                         conn->receiveMessageLength += length;
 819                                         if (flags & NETFLAG_EOM)
 820                                         {
 821                                                 reliableMessagesReceived++;
 822                                                 length = conn->receiveMessageLength;
 823                                                 conn->receiveMessageLength = 0;
 824                                                 if (length > 0)
 825                                                 {
 826                                                         SZ_Clear(&net_message);
 827                                                         SZ_Write(&net_message, conn->receiveMessage, length);
 828                                                         MSG_BeginReading();
 829                                                         return 2;
 830                                                 }
 831                                         }
 832                                 }
 833                                 else
 834                                         receivedDuplicateCount++;
 835                                 return 1;
 836                         }
 837                 }
 838         }
 839         return 0;
 840 }
 841
 842 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 843 {
 844         cls.connect_trying = false;
 845         M_Update_Return_Reason("");
 846         // the connection request succeeded, stop current connection and set up a new connection
 847         CL_Disconnect();
 848         cls.netcon = NetConn_Open(mysocket, peeraddress);
 849         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
 850         key_dest = key_game;
 851         m_state = m_none;
 852         cls.demonum = -1;                       // not in the demo loop now
 853         cls.state = ca_connected;
 854         cls.signon = 0;                         // need all the signon messages before playing
 855         CL_ClearState();
 856 }
 857
 858 int NetConn_IsLocalGame(void)
 859 {
 860         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
 861                 return true;
 862         return false;
 863 }
 864
 865 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 866 {
 867         int ret, c, control;
 868         lhnetaddress_t svaddress;
 869         const char *s;
 870         char *string, addressstring2[128], cname[128], ipstring[32];
 871         char stringbuf[16384];
 872
 873         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 874         {
 875                 // received a command string - strip off the packaging and put it
 876                 // into our string buffer with NULL termination
 877                 data += 4;
 878                 length -= 4;
 879                 length = min(length, (int)sizeof(stringbuf) - 1);
 880                 memcpy(stringbuf, data, length);
 881                 stringbuf[length] = 0;
 882                 string = stringbuf;
 883
 884                 if (developer.integer)
 885                 {
 886                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 887                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
 888                         Com_HexDumpToConsole(data, length);
 889                 }
 890
 891                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
 892                 {
 893                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 894                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
 895                         M_Update_Return_Reason("Got challenge response");
 896                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\challenge\\%s", string + 10), peeraddress);
 897                         return true;
 898                 }
 899                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
 900                 {
 901                         M_Update_Return_Reason("Accepted");
 902                         NetConn_ConnectionEstablished(mysocket, peeraddress);
 903                         return true;
 904                 }
 905                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
 906                 {
 907                         char rejectreason[32];
 908                         cls.connect_trying = false;
 909                         string += 7;
 910                         length = max(length - 7, (int)sizeof(rejectreason) - 1);
 911                         memcpy(rejectreason, string, length);
 912                         rejectreason[length] = 0;
 913                         M_Update_Return_Reason(rejectreason);
 914                         return true;
 915                 }
 916                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
 917                 {
 918                         serverlist_info_t *info;
 919                         int i, n;
 920                         double pingtime;
 921
 922                         string += 13;
 923                         // serverlist only uses text addresses
 924                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
 925                         // search the cache for this server and update it
 926                         for( n = 0; n < serverlist_cachecount; n++ )
 927                                 if( !strcmp( cname, serverlist_cache[n].info.cname ) )
 928                                         break;
 929                         if( n == serverlist_cachecount )
 930                                 return true;
 931
 932                         info = &serverlist_cache[n].info;
 933                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));else info->game[0] = 0;
 934                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
 935                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
 936                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
 937                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);else info->protocol = -1;
 938                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);else info->numplayers = 0;
 939                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
 940
 941                         if (info->ping == 100000)
 942                                         serverreplycount++;
 943
 944                         pingtime = (int)((realtime - serverlist_cache[n].querytime) * 1000.0);
 945                         pingtime = bound(0, pingtime, 9999);
 946                         // update the ping
 947                         info->ping = pingtime;
 948
 949                         // legacy/old stuff move it to the menu ASAP
 950
 951                         // build description strings for the things users care about
 952                         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);
 953                         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);
 954                         // if ping is especially high, display it as such
 955                         if (pingtime >= 300)
 956                         {
 957                                 // orange numbers (lower block)
 958                                 for (i = 0;i < 5;i++)
 959                                         if (serverlist_cache[n].line1[i] != ' ')
 960                                                 serverlist_cache[n].line1[i] += 128;
 961                         }
 962                         else if (pingtime >= 200)
 963                         {
 964                                 // yellow numbers (in upper block)
 965                                 for (i = 0;i < 5;i++)
 966                                         if (serverlist_cache[n].line1[i] != ' ')
 967                                                 serverlist_cache[n].line1[i] -= 30;
 968                         }
 969                         // and finally, update the view set
 970                         if( serverlist_cache[n].finished )
 971                 ServerList_ViewList_Remove( &serverlist_cache[n] );
 972                         // else if not in the slist menu we should print the server to console (if wanted)
 973                         else if( serverlist_consoleoutput )
 974                                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
 975                         ServerList_ViewList_Insert( &serverlist_cache[n] );
 976                         serverlist_cache[n].finished = true;
 977
 978                         return true;
 979                 }
 980                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
 981                 {
 982                         // Extract the IP addresses
 983                         data += 18;
 984                         length -= 18;
 985                         masterreplycount++;
 986                         if (serverlist_consoleoutput)
 987                                 Con_Print("received server list...\n");
 988                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
 989                         {
 990                                 int n;
 991
 992                                 serverquerycount++;
 993
 994                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
 995                                 if (developer.integer)
 996                                         Con_Printf("Requesting info from server %s\n", ipstring);
 997                                 // ignore the rest of the message if the serverlist is full
 998                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
 999                                         break;
1000                                 // also ignore it if we have already queried it (other master server response)
1001                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1002                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1003                                                 break;
1004                                 if( n < serverlist_cachecount )
1005                                         break;
1006
1007                                 LHNETADDRESS_FromString(&svaddress, ipstring, 0);
1008                                 NetConn_WriteString(mysocket, "\377\377\377\377getinfo", &svaddress);
1009
1010                                 memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1011                                 // store the data the engine cares about (address and ping)
1012                                 strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1013                                 serverlist_cache[serverlist_cachecount].info.ping = 100000;
1014                                 serverlist_cache[serverlist_cachecount].querytime = realtime;
1015                                 // if not in the slist menu we should print the server to console
1016                                 if (serverlist_consoleoutput)
1017                                         Con_Printf("querying %s\n", ipstring);
1018
1019                                 ++serverlist_cachecount;
1020
1021                                 // move on to next address in packet
1022                                 data += 7;
1023                                 length -= 7;
1024                         }
1025                         return true;
1026                 }
1027                 /*
1028                 if (!strncmp(string, "ping", 4))
1029                 {
1030                         if (developer.integer)
1031                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1032                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1033                         return true;
1034                 }
1035                 if (!strncmp(string, "ack", 3))
1036                         return true;
1037                 */
1038                 // we may not have liked the packet, but it was a command packet, so
1039                 // we're done processing this packet now
1040                 return true;
1041         }
1042         // netquake control packets, supported for compatibility only
1043         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1044         {
1045                 c = data[4];
1046                 data += 5;
1047                 length -= 5;
1048                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1049                 switch (c)
1050                 {
1051                 case CCREP_ACCEPT:
1052                         if (developer.integer)
1053                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
1054                         if (cls.connect_trying)
1055                         {
1056                                 lhnetaddress_t clientportaddress;
1057                                 clientportaddress = *peeraddress;
1058                                 if (length >= 4)
1059                                 {
1060                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
1061                                         data += 4;
1062                                         length -= 4;
1063                                         LHNETADDRESS_SetPort(&clientportaddress, port);
1064                                 }
1065                                 M_Update_Return_Reason("Accepted");
1066                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress);
1067                         }
1068                         break;
1069                 case CCREP_REJECT:
1070                         if (developer.integer)
1071                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1072                         cls.connect_trying = false;
1073                         M_Update_Return_Reason(data);
1074                         break;
1075 #if 0
1076                 case CCREP_SERVER_INFO:
1077                         if (developer.integer)
1078                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1079                         if (cls.state != ca_dedicated)
1080                         {
1081                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
1082                                 // string we just ignore it and keep the real address
1083                                 MSG_ReadString();
1084                                 // serverlist only uses text addresses
1085                                 cname = UDP_AddrToString(readaddr);
1086                                 // search the cache for this server
1087                                 for (n = 0; n < hostCacheCount; n++)
1088                                         if (!strcmp(cname, serverlist[n].cname))
1089                                                 break;
1090                                 // add it
1091                                 if (n == hostCacheCount && hostCacheCount < SERVERLISTSIZE)
1092                                 {
1093                                         hostCacheCount++;
1094                                         memset(&serverlist[n], 0, sizeof(serverlist[n]));
1095                                         strlcpy (serverlist[n].name, MSG_ReadString(), sizeof (serverlist[n].name));
1096                                         strlcpy (serverlist[n].map, MSG_ReadString(), sizeof (serverlist[n].map));
1097                                         serverlist[n].users = MSG_ReadByte();
1098                                         serverlist[n].maxusers = MSG_ReadByte();
1099                                         c = MSG_ReadByte();
1100                                         if (c != NET_PROTOCOL_VERSION)
1101                                         {
1102                                                 strlcpy (serverlist[n].cname, serverlist[n].name, sizeof (serverlist[n].cname));
1103                                                 strcpy(serverlist[n].name, "*");
1104                                                 strlcat (serverlist[n].name, serverlist[n].cname, sizeof(serverlist[n].name));
1105                                         }
1106                                         strlcpy (serverlist[n].cname, cname, sizeof (serverlist[n].cname));
1107                                 }
1108                         }
1109                         break;
1110                 case CCREP_PLAYER_INFO:
1111                         // we got a CCREP_PLAYER_INFO??
1112                         //if (developer.integer)
1113                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1114                         break;
1115                 case CCREP_RULE_INFO:
1116                         // we got a CCREP_RULE_INFO??
1117                         //if (developer.integer)
1118                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1119                         break;
1120 #endif
1121                 default:
1122                         break;
1123                 }
1124                 // we may not have liked the packet, but it was a valid control
1125                 // packet, so we're done processing this packet now
1126                 return true;
1127         }
1128         ret = 0;
1129         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)
1130                 CL_ParseServerMessage();
1131         return ret;
1132 }
1133
1134 void NetConn_ClientFrame(void)
1135 {
1136         int i, length;
1137         lhnetaddress_t peeraddress;
1138         netconn_t *conn;
1139         NetConn_UpdateServerStuff();
1140         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
1141         {
1142                 if (cls.connect_remainingtries == 0)
1143                 {
1144                         cls.connect_trying = false;
1145                         M_Update_Return_Reason("Connect: Failed");
1146                         return;
1147                 }
1148                 cls.connect_nextsendtime = realtime + 1;
1149                 cls.connect_remainingtries--;
1150                 // try challenge first (newer server)
1151                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
1152                 // then try netquake as a fallback (old server, or netquake)
1153                 SZ_Clear(&net_message);
1154                 // save space for the header, filled in later
1155                 MSG_WriteLong(&net_message, 0);
1156                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
1157                 MSG_WriteString(&net_message, "QUAKE");
1158                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1159                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1160                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
1161                 SZ_Clear(&net_message);
1162         }
1163         for (i = 0;i < cl_numsockets;i++)
1164                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1165                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
1166         if (cls.netcon && realtime > cls.netcon->timeout)
1167         {
1168                 Con_Print("Connection timed out\n");
1169                 CL_Disconnect();
1170                 Host_ShutdownServer (false);
1171         }
1172         for (conn = netconn_list;conn;conn = conn->next)
1173                 NetConn_ReSendMessage(conn);
1174 }
1175
1176 #define MAX_CHALLENGES 128
1177 struct
1178 {
1179         lhnetaddress_t address;
1180         double time;
1181         char string[12];
1182 }
1183 challenge[MAX_CHALLENGES];
1184
1185 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
1186 {
1187         int i;
1188         char c;
1189         for (i = 0;i < bufferlength - 1;i++)
1190         {
1191                 do
1192                 {
1193                         c = rand () % (127 - 33) + 33;
1194                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
1195                 buffer[i] = c;
1196         }
1197         buffer[i] = 0;
1198 }
1199
1200 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
1201 {
1202         int i, n, ret, clientnum, responselength, best;
1203         double besttime;
1204         client_t *client;
1205         netconn_t *conn;
1206         char *s, *string, response[512], addressstring2[128], stringbuf[16384];
1207
1208         if (sv.active)
1209         {
1210                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1211                 {
1212                         // received a command string - strip off the packaging and put it
1213                         // into our string buffer with NULL termination
1214                         data += 4;
1215                         length -= 4;
1216                         length = min(length, (int)sizeof(stringbuf) - 1);
1217                         memcpy(stringbuf, data, length);
1218                         stringbuf[length] = 0;
1219                         string = stringbuf;
1220
1221                         if (developer.integer)
1222                         {
1223                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1224                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1225                                 Com_HexDumpToConsole(data, length);
1226                         }
1227
1228                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
1229                         {
1230                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1231                                 {
1232                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1233                                                 break;
1234                                         if (besttime > challenge[i].time)
1235                                                 besttime = challenge[best = i].time;
1236                                 }
1237                                 // if we did not find an exact match, choose the oldest and
1238                                 // update address and string
1239                                 if (i == MAX_CHALLENGES)
1240                                 {
1241                                         i = best;
1242                                         challenge[i].address = *peeraddress;
1243                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1244                                 }
1245                                 challenge[i].time = realtime;
1246                                 // send the challenge
1247                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1248                                 return true;
1249                         }
1250                         if (length > 8 && !memcmp(string, "connect\\", 8))
1251                         {
1252                                 string += 7;
1253                                 length -= 7;
1254                                 if ((s = SearchInfostring(string, "challenge")))
1255                                 {
1256                                         // validate the challenge
1257                                         for (i = 0;i < MAX_CHALLENGES;i++)
1258                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1259                                                         break;
1260                                         if (i < MAX_CHALLENGES)
1261                                         {
1262                                                 // check engine protocol
1263                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1264                                                 {
1265                                                         if (developer.integer)
1266                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1267                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1268                                                 }
1269                                                 else
1270                                                 {
1271                                                         // see if this is a duplicate connection request
1272                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1273                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1274                                                                         break;
1275                                                         if (clientnum < svs.maxclients)
1276                                                         {
1277                                                                 // duplicate connection request
1278                                                                 if (realtime - client->connecttime < 2.0)
1279                                                                 {
1280                                                                         // client is still trying to connect,
1281                                                                         // so we send a duplicate reply
1282                                                                         if (developer.integer)
1283                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1284                                                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1285                                                                 }
1286                                                                 // only kick if old connection seems dead
1287                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1288                                                                 {
1289                                                                         // kick off connection and await retry
1290                                                                         client->deadsocket = true;
1291                                                                 }
1292                                                         }
1293                                                         else
1294                                                         {
1295                                                                 // this is a new client, find a slot
1296                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1297                                                                         if (!client->active)
1298                                                                                 break;
1299                                                                 if (clientnum < svs.maxclients)
1300                                                                 {
1301                                                                         // prepare the client struct
1302                                                                         if ((conn = NetConn_Open(mysocket, peeraddress)))
1303                                                                         {
1304                                                                                 // allocated connection
1305                                                                                 LHNETADDRESS_ToString(peeraddress, conn->address, sizeof(conn->address), true);
1306                                                                                 if (developer.integer)
1307                                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1308                                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1309                                                                                 // now set up the client
1310                                                                                 SV_ConnectClient(clientnum, conn);
1311                                                                                 NetConn_Heartbeat(1);
1312                                                                         }
1313                                                                 }
1314                                                                 else
1315                                                                 {
1316                                                                         // server is full
1317                                                                         if (developer.integer)
1318                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1319                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1320                                                                 }
1321                                                         }
1322                                                 }
1323                                         }
1324                                 }
1325                                 return true;
1326                         }
1327                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1328                         {
1329                                 const char *challenge = NULL;
1330                                 // If there was a challenge in the getinfo message
1331                                 if (length > 8 && string[7] == ' ')
1332                                         challenge = string + 8;
1333                                 for (i = 0, n = 0;i < svs.maxclients;i++)
1334                                         if (svs.clients[i].active)
1335                                                 n++;
1336                                 responselength = dpsnprintf(response, sizeof(response), "\377\377\377\377infoResponse\x0A"
1337                                                         "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
1338                                                         "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d%s%s",
1339                                                         gamename, com_modname, svs.maxclients, n,
1340                                                         sv.name, hostname.string, NET_PROTOCOL_VERSION, challenge ? "\\challenge\\" : "", challenge ? challenge : "");
1341                                 // does it fit in the buffer?
1342                                 if (responselength >= 0)
1343                                 {
1344                                         if (developer.integer)
1345                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1346                                         NetConn_WriteString(mysocket, response, peeraddress);
1347                                 }
1348                                 return true;
1349                         }
1350                         /*
1351                         if (!strncmp(string, "ping", 4))
1352                         {
1353                                 if (developer.integer)
1354                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1355                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1356                                 return true;
1357                         }
1358                         if (!strncmp(string, "ack", 3))
1359                                 return true;
1360                         */
1361                         // we may not have liked the packet, but it was a command packet, so
1362                         // we're done processing this packet now
1363                         return true;
1364                 }
1365                 // LordHavoc: disabled netquake control packet support in server
1366 #if 0
1367                 {
1368                         int c, control;
1369                         // netquake control packets, supported for compatibility only
1370                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1371                         {
1372                                 c = data[4];
1373                                 data += 5;
1374                                 length -= 5;
1375                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1376                                 switch (c)
1377                                 {
1378                                 case CCREQ_CONNECT:
1379                                         //if (developer.integer)
1380                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1381                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
1382                                         {
1383                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1384                                                 {
1385                                                         if (developer.integer)
1386                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1387                                                         SZ_Clear(&net_message);
1388                                                         // save space for the header, filled in later
1389                                                         MSG_WriteLong(&net_message, 0);
1390                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1391                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
1392                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1393                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1394                                                         SZ_Clear(&net_message);
1395                                                 }
1396                                                 else
1397                                                 {
1398                                                         // see if this is a duplicate connection request
1399                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1400                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1401                                                                         break;
1402                                                         if (clientnum < svs.maxclients)
1403                                                         {
1404                                                                 // duplicate connection request
1405                                                                 if (realtime - client->connecttime < 2.0)
1406                                                                 {
1407                                                                         // client is still trying to connect,
1408                                                                         // so we send a duplicate reply
1409                                                                         if (developer.integer)
1410                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1411                                                                         SZ_Clear(&net_message);
1412                                                                         // save space for the header, filled in later
1413                                                                         MSG_WriteLong(&net_message, 0);
1414                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1415                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1416                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1417                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1418                                                                         SZ_Clear(&net_message);
1419                                                                 }
1420                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1421                                                                 {
1422                                                                         // the old client hasn't sent us anything
1423                                                                         // in quite a while, so kick off and let
1424                                                                         // the retry take care of it...
1425                                                                         client->deadsocket = true;
1426                                                                 }
1427                                                         }
1428                                                         else
1429                                                         {
1430                                                                 // this is a new client, find a slot
1431                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1432                                                                         if (!client->active)
1433                                                                                 break;
1434                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
1435                                                                 {
1436                                                                         // connect to the client
1437                                                                         // everything is allocated, just fill in the details
1438                                                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
1439                                                                         if (developer.integer)
1440                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
1441                                                                         // send back the info about the server connection
1442                                                                         SZ_Clear(&net_message);
1443                                                                         // save space for the header, filled in later
1444                                                                         MSG_WriteLong(&net_message, 0);
1445                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1446                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
1447                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1448                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1449                                                                         SZ_Clear(&net_message);
1450                                                                         // now set up the client struct
1451                                                                         SV_ConnectClient(clientnum, conn);
1452                                                                         NetConn_Heartbeat(1);
1453                                                                 }
1454                                                                 else
1455                                                                 {
1456                                                                         //if (developer.integer)
1457                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
1458                                                                         // no room; try to let player know
1459                                                                         SZ_Clear(&net_message);
1460                                                                         // save space for the header, filled in later
1461                                                                         MSG_WriteLong(&net_message, 0);
1462                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1463                                                                         MSG_WriteString(&net_message, "Server is full.\n");
1464                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1465                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1466                                                                         SZ_Clear(&net_message);
1467                                                                 }
1468                                                         }
1469                                                 }
1470                                         }
1471                                         break;
1472 #if 0
1473                                 case CCREQ_SERVER_INFO:
1474                                         if (developer.integer)
1475                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
1476                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
1477                                         {
1478                                                 if (developer.integer)
1479                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
1480                                                 SZ_Clear(&net_message);
1481                                                 // save space for the header, filled in later
1482                                                 MSG_WriteLong(&net_message, 0);
1483                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1484                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1485                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1486                                                 MSG_WriteString(&net_message, hostname.string);
1487                                                 MSG_WriteString(&net_message, sv.name);
1488                                                 MSG_WriteByte(&net_message, net_activeconnections);
1489                                                 MSG_WriteByte(&net_message, svs.maxclients);
1490                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1491                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1492                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1493                                                 SZ_Clear(&net_message);
1494                                         }
1495                                         break;
1496                                 case CCREQ_PLAYER_INFO:
1497                                         if (developer.integer)
1498                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1499                                         if (sv.active)
1500                                         {
1501                                                 int playerNumber, activeNumber, clientNumber;
1502                                                 client_t *client;
1503
1504                                                 playerNumber = MSG_ReadByte();
1505                                                 activeNumber = -1;
1506                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1507                                                         if (client->active && ++activeNumber == playerNumber)
1508                                                                 break;
1509                                                 if (clientNumber != svs.maxclients)
1510                                                 {
1511                                                         SZ_Clear(&net_message);
1512                                                         // save space for the header, filled in later
1513                                                         MSG_WriteLong(&net_message, 0);
1514                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1515                                                         MSG_WriteByte(&net_message, playerNumber);
1516                                                         MSG_WriteString(&net_message, client->name);
1517                                                         MSG_WriteLong(&net_message, client->colors);
1518                                                         MSG_WriteLong(&net_message, (int)client->edict->v->frags);
1519                                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
1520                                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
1521                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1522                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1523                                                         SZ_Clear(&net_message);
1524                                                 }
1525                                         }
1526                                         break;
1527                                 case CCREQ_RULE_INFO:
1528                                         if (developer.integer)
1529                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1530                                         if (sv.active)
1531                                         {
1532                                                 char *prevCvarName;
1533                                                 cvar_t *var;
1534
1535                                                 // find the search start location
1536                                                 prevCvarName = MSG_ReadString();
1537                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1538
1539                                                 // send the response
1540                                                 SZ_Clear(&net_message);
1541                                                 // save space for the header, filled in later
1542                                                 MSG_WriteLong(&net_message, 0);
1543                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1544                                                 if (var)
1545                                                 {
1546                                                         MSG_WriteString(&net_message, var->name);
1547                                                         MSG_WriteString(&net_message, var->string);
1548                                                 }
1549                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1550                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1551                                                 SZ_Clear(&net_message);
1552                                         }
1553                                         break;
1554 #endif
1555                                 default:
1556                                         break;
1557                                 }
1558                                 // we may not have liked the packet, but it was a valid control
1559                                 // packet, so we're done processing this packet now
1560                                 return true;
1561                         }
1562                 }
1563 #endif
1564                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1565                 {
1566                         if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1567                         {
1568                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1569                                         SV_ReadClientMessage();
1570                                 return ret;
1571                         }
1572                 }
1573         }
1574         return 0;
1575 }
1576
1577 void NetConn_ServerFrame(void)
1578 {
1579         int i, length;
1580         lhnetaddress_t peeraddress;
1581         netconn_t *conn;
1582         NetConn_UpdateServerStuff();
1583         for (i = 0;i < sv_numsockets;i++)
1584                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1585                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1586         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1587         {
1588                 // never timeout loopback connections
1589                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
1590                 {
1591                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1592                         SV_DropClient(false);
1593                 }
1594         }
1595         for (conn = netconn_list;conn;conn = conn->next)
1596                 NetConn_ReSendMessage(conn);
1597 }
1598
1599 void NetConn_QueryMasters(void)
1600 {
1601         int i;
1602         int masternum;
1603         lhnetaddress_t masteraddress;
1604         lhnetaddress_t broadcastaddress;
1605         char request[256];
1606
1607         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
1608                 return;
1609
1610         // 26000 is the default quake server port, servers on other ports will not
1611         // be found
1612         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
1613         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
1614
1615         for (i = 0;i < cl_numsockets;i++)
1616         {
1617                 if (cl_sockets[i])
1618                 {
1619                         // search LAN for Quake servers
1620                         SZ_Clear(&net_message);
1621                         // save space for the header, filled in later
1622                         MSG_WriteLong(&net_message, 0);
1623                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1624                         MSG_WriteString(&net_message, "QUAKE");
1625                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1626                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1627                         NetConn_Write(cl_sockets[i], net_message.data, net_message.cursize, &broadcastaddress);
1628                         SZ_Clear(&net_message);
1629
1630                         // search LAN for DarkPlaces servers
1631                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377getinfo", &broadcastaddress);
1632
1633                         // build the getservers message to send to the master servers
1634                         dpsnprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1635
1636                         // search internet
1637                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1638                         {
1639                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1640                                 {
1641                                         masterquerycount++;
1642                                         NetConn_WriteString(cl_sockets[i], request, &masteraddress);
1643                                 }
1644                         }
1645                 }
1646         }
1647         if (!masterquerycount)
1648         {
1649                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
1650                 M_Update_Return_Reason("No network");
1651         }
1652 }
1653
1654 void NetConn_Heartbeat(int priority)
1655 {
1656         lhnetaddress_t masteraddress;
1657         int masternum;
1658         lhnetsocket_t *mysocket;
1659
1660         // if it's a state change (client connected), limit next heartbeat to no
1661         // more than 30 sec in the future
1662         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1663                 nextheartbeattime = realtime + 30.0;
1664
1665         // limit heartbeatperiod to 30 to 270 second range,
1666         // lower limit is to avoid abusing master servers with excess traffic,
1667         // upper limit is to avoid timing out on the master server (which uses
1668         // 300 sec timeout)
1669         if (sv_heartbeatperiod.value < 30)
1670                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1671         if (sv_heartbeatperiod.value > 270)
1672                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1673
1674         // make advertising optional and don't advertise singleplayer games, and
1675         // only send a heartbeat as often as the admin wants
1676         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1677         {
1678                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1679                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1680                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1681                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
1682         }
1683 }
1684
1685 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1686 {
1687         int i, count = 0;
1688         qbyte sent[MAX_SCOREBOARD];
1689
1690         memset(sent, 0, sizeof(sent));
1691
1692         // simultaneously wait for the first CanSendMessage and send the message,
1693         // then wait for a second CanSendMessage (verifying it was received), or
1694         // the client drops and is no longer counted
1695         // the loop aborts when either it runs out of clients to send to, or a
1696         // timeout expires
1697         blocktime += Sys_DoubleTime();
1698         do
1699         {
1700                 count = 0;
1701                 NetConn_ClientFrame();
1702                 NetConn_ServerFrame();
1703                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1704                 {
1705                         if (host_client->netconnection)
1706                         {
1707                                 if (NetConn_CanSendMessage(host_client->netconnection))
1708                                 {
1709                                         if (!sent[i])
1710                                                 NetConn_SendReliableMessage(host_client->netconnection, data);
1711                                         sent[i] = true;
1712                                 }
1713                                 if (!NetConn_CanSendMessage(host_client->netconnection))
1714                                         count++;
1715                         }
1716                 }
1717         }
1718         while (count && Sys_DoubleTime() < blocktime);
1719         return count;
1720 }
1721
1722 static void Net_Heartbeat_f(void)
1723 {
1724         if (sv.active)
1725                 NetConn_Heartbeat(2);
1726         else
1727                 Con_Print("No server running, can not heartbeat to master server.\n");
1728 }
1729
1730 void PrintStats(netconn_t *conn)
1731 {
1732         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1733 }
1734
1735 void Net_Stats_f(void)
1736 {
1737         netconn_t *conn;
1738         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1739         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1740         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1741         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1742         Con_Printf("packetsSent                = %i\n", packetsSent);
1743         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1744         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1745         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1746         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1747         Con_Print("connections                =\n");
1748         for (conn = netconn_list;conn;conn = conn->next)
1749                 PrintStats(conn);
1750 }
1751
1752 void Net_Slist_f(void)
1753 {
1754         ServerList_ResetMasks();
1755         serverlist_sortbyfield = SLIF_PING;
1756         serverlist_sortdescending = false;
1757     if (m_state != m_slist) {
1758                 Con_Print("Sending requests to master servers\n");
1759                 ServerList_QueryList();
1760                 serverlist_consoleoutput = true;
1761                 Con_Print("Listening for replies...\n");
1762         } else
1763                 ServerList_QueryList();
1764 }
1765
1766 void NetConn_Init(void)
1767 {
1768         int i;
1769         lhnetaddress_t tempaddress;
1770         netconn_mempool = Mem_AllocPool("Networking", 0, NULL);
1771         Cmd_AddCommand("net_stats", Net_Stats_f);
1772         Cmd_AddCommand("net_slist", Net_Slist_f);
1773         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
1774         Cvar_RegisterVariable(&net_messagetimeout);
1775         Cvar_RegisterVariable(&net_messagerejointimeout);
1776         Cvar_RegisterVariable(&net_connecttimeout);
1777         Cvar_RegisterVariable(&cl_netlocalping);
1778         Cvar_RegisterVariable(&cl_netpacketloss);
1779         Cvar_RegisterVariable(&hostname);
1780         Cvar_RegisterVariable(&developer_networking);
1781         Cvar_RegisterVariable(&cl_netport);
1782         Cvar_RegisterVariable(&sv_netport);
1783         Cvar_RegisterVariable(&net_address);
1784         //Cvar_RegisterVariable(&net_address_ipv6);
1785         Cvar_RegisterVariable(&sv_public);
1786         Cvar_RegisterVariable(&sv_heartbeatperiod);
1787         for (i = 0;sv_masters[i].name;i++)
1788                 Cvar_RegisterVariable(&sv_masters[i]);
1789 // 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.
1790         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
1791         {
1792                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
1793                 {
1794                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
1795                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
1796                 }
1797                 else
1798                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
1799         }
1800 // 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
1801         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
1802         {
1803                 i = atoi(com_argv[i + 1]);
1804                 if (i >= 0 && i < 65536)
1805                 {
1806                         Con_Printf("-port option used, setting port cvar to %i\n", i);
1807                         Cvar_SetValueQuick(&sv_netport, i);
1808                 }
1809                 else
1810                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
1811         }
1812         cl_numsockets = 0;
1813         sv_numsockets = 0;
1814         SZ_Alloc(&net_message, NET_MAXMESSAGE, "net_message");
1815         LHNET_Init();
1816 }
1817
1818 void NetConn_Shutdown(void)
1819 {
1820         NetConn_CloseClientPorts();
1821         NetConn_CloseServerPorts();
1822         LHNET_Shutdown();
1823 }
1824