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