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