netconn.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3 Copyright (C) 2002 Mathieu Olivier
   4 Copyright (C) 2003 Forest Hale
   5
   6 This program is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public License
   8 as published by the Free Software Foundation; either version 2
   9 of the License, or (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14
  15 See the GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20
  21 */
  22
  23 #include "quakedef.h"
  24 #include "lhnet.h"
  25
  26 #define MASTER_PORT 27950
  27
  28 // note this defaults on for dedicated servers, off for listen servers
  29 cvar_t sv_public = {0, "sv_public", "0", "advertises this server on the master server (so that players can find it in the server browser)"};
  30 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "120", "how often to send heartbeat in seconds (only used if sv_public is 1)"};
  31
  32 // FIXME: resolve DNS on masters whenever their value changes and cache it (to avoid major delays in active servers when they heartbeat)
  33 static cvar_t sv_masters [] =
  34 {
  35         {CVAR_SAVE, "sv_master1", "", "user-chosen master server 1"},
  36         {CVAR_SAVE, "sv_master2", "", "user-chosen master server 2"},
  37         {CVAR_SAVE, "sv_master3", "", "user-chosen master server 3"},
  38         {CVAR_SAVE, "sv_master4", "", "user-chosen master server 4"},
  39         {0, "sv_masterextra1", "ghdigital.com", "default master server 1 (admin: LordHavoc)"}, // admin: LordHavoc
  40         {0, "sv_masterextra2", "dpmaster.deathmask.net", "default master server 2 (admin: Willis)"}, // admin: Willis
  41         {0, "sv_masterextra3", "12.166.196.192", "default master server 3 (admin: Venim)"}, // admin: Venim
  42         {0, "sv_masterextra4", "excalibur.nvg.ntnu.no", "default master server 4 (admin: tChr)"}, // admin: tChr
  43         {0, NULL, NULL, NULL}
  44 };
  45
  46 static double nextheartbeattime = 0;
  47
  48 sizebuf_t net_message;
  49 static unsigned char net_message_buf[NET_MAXMESSAGE];
  50
  51 cvar_t net_messagetimeout = {0, "net_messagetimeout","300", "drops players who have not sent any packets for this many seconds"};
  52 cvar_t net_messagerejointimeout = {0, "net_messagerejointimeout","10", "give a player this much time in seconds to rejoin and continue playing (not losing frags and such)"};
  53 cvar_t net_connecttimeout = {0, "net_connecttimeout","10", "after requesting a connection, the client must reply within this many seconds or be dropped (cuts down on connect floods)"};
  54 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED", "server message to show in server browser"};
  55 cvar_t developer_networking = {0, "developer_networking", "0", "prints all received and sent packets (recommended only for debugging)"};
  56
  57 cvar_t cl_netlocalping = {0, "cl_netlocalping","0", "lags local loopback connection by this much ping time (useful to play more fairly on your own server with people with higher pings)"};
  58 static cvar_t cl_netpacketloss = {0, "cl_netpacketloss","0", "drops this percentage of packets (incoming and outgoing), useful for testing network protocol robustness (effects failing to start, sounds failing to play, etc)"};
  59 static cvar_t net_slist_queriespersecond = {0, "net_slist_queriespersecond", "20", "how many server information requests to send per second"};
  60 static cvar_t net_slist_queriesperframe = {0, "net_slist_queriesperframe", "4", "maximum number of server information requests to send each rendered frame (guards against low framerates causing problems)"};
  61 static cvar_t net_slist_timeout = {0, "net_slist_timeout", "4", "how long to listen for a server information response before giving up"};
  62 static cvar_t net_slist_maxtries = {0, "net_slist_maxtries", "3", "how many times to ask the same server for information (more times gives better ping reports but takes longer)"};
  63
  64 /* statistic counters */
  65 static int packetsSent = 0;
  66 static int packetsReSent = 0;
  67 static int packetsReceived = 0;
  68 static int receivedDuplicateCount = 0;
  69 static int droppedDatagrams = 0;
  70
  71 static int unreliableMessagesSent = 0;
  72 static int unreliableMessagesReceived = 0;
  73 static int reliableMessagesSent = 0;
  74 static int reliableMessagesReceived = 0;
  75
  76 double masterquerytime = -1000;
  77 int masterquerycount = 0;
  78 int masterreplycount = 0;
  79 int serverquerycount = 0;
  80 int serverreplycount = 0;
  81
  82 // this is only false if there are still servers left to query
  83 int serverlist_querysleep = true;
  84
  85 static unsigned char sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  86 static unsigned char readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  87
  88 int cl_numsockets;
  89 lhnetsocket_t *cl_sockets[16];
  90 int sv_numsockets;
  91 lhnetsocket_t *sv_sockets[16];
  92
  93 netconn_t *netconn_list = NULL;
  94 mempool_t *netconn_mempool = NULL;
  95
  96 cvar_t cl_netport = {0, "cl_port", "0", "forces client to use chosen port number if not 0"};
  97 cvar_t sv_netport = {0, "port", "26000", "server port for players to connect to"};
  98 cvar_t net_address = {0, "net_address", "0.0.0.0", "network address to open ports on"};
  99 //cvar_t net_netaddress_ipv6 = {0, "net_address_ipv6", "[0:0:0:0:0:0:0:0]", "network address to open ipv6 ports on"};
 100
 101 // ServerList interface
 102 serverlist_mask_t serverlist_andmasks[SERVERLIST_ANDMASKCOUNT];
 103 serverlist_mask_t serverlist_ormasks[SERVERLIST_ORMASKCOUNT];
 104
 105 serverlist_infofield_t serverlist_sortbyfield;
 106 qboolean serverlist_sortdescending;
 107
 108 int serverlist_viewcount = 0;
 109 serverlist_entry_t *serverlist_viewlist[SERVERLIST_VIEWLISTSIZE];
 110
 111 int serverlist_cachecount;
 112 serverlist_entry_t serverlist_cache[SERVERLIST_TOTALSIZE];
 113
 114 qboolean serverlist_consoleoutput;
 115
 116 // helper function to insert a value into the viewset
 117 // spare entries will be removed
 118 static void _ServerList_ViewList_Helper_InsertBefore( int index, serverlist_entry_t *entry )
 119 {
 120     int i;
 121         if( serverlist_viewcount < SERVERLIST_VIEWLISTSIZE ) {
 122                 i = serverlist_viewcount++;
 123         } else {
 124                 i = SERVERLIST_VIEWLISTSIZE - 1;
 125         }
 126
 127         for( ; i > index ; i-- )
 128                 serverlist_viewlist[ i ] = serverlist_viewlist[ i - 1 ];
 129
 130         serverlist_viewlist[index] = entry;
 131 }
 132
 133 // we suppose serverlist_viewcount to be valid, ie > 0
 134 static void _ServerList_ViewList_Helper_Remove( int index )
 135 {
 136         serverlist_viewcount--;
 137         for( ; index < serverlist_viewcount ; index++ )
 138                 serverlist_viewlist[index] = serverlist_viewlist[index + 1];
 139 }
 140
 141 // returns true if A should be inserted before B
 142 static qboolean _ServerList_Entry_Compare( serverlist_entry_t *A, serverlist_entry_t *B )
 143 {
 144         int result = 0; // > 0 if for numbers A > B and for text if A < B
 145
 146         switch( serverlist_sortbyfield ) {
 147                 case SLIF_PING:
 148                         result = A->info.ping - B->info.ping;
 149                         break;
 150                 case SLIF_MAXPLAYERS:
 151                         result = A->info.maxplayers - B->info.maxplayers;
 152                         break;
 153                 case SLIF_NUMPLAYERS:
 154                         result = A->info.numplayers - B->info.numplayers;
 155                         break;
 156                 case SLIF_PROTOCOL:
 157                         result = A->info.protocol - B->info.protocol;
 158                         break;
 159                 case SLIF_CNAME:
 160                         result = strcmp( B->info.cname, A->info.cname );
 161                         break;
 162                 case SLIF_GAME:
 163                         result = strcmp( B->info.game, A->info.game );
 164                         break;
 165                 case SLIF_MAP:
 166                         result = strcmp( B->info.map, A->info.map );
 167                         break;
 168                 case SLIF_MOD:
 169                         result = strcmp( B->info.mod, A->info.mod );
 170                         break;
 171                 case SLIF_NAME:
 172                         result = strcmp( B->info.name, A->info.name );
 173                         break;
 174                 default:
 175                         Con_DPrint( "_ServerList_Entry_Compare: Bad serverlist_sortbyfield!\n" );
 176                         break;
 177         }
 178
 179         if( serverlist_sortdescending )
 180                 return result > 0;
 181         return result < 0;
 182 }
 183
 184 static qboolean _ServerList_CompareInt( int A, serverlist_maskop_t op, int B )
 185 {
 186         // This should actually be done with some intermediate and end-of-function return
 187         switch( op ) {
 188                 case SLMO_LESS:
 189                         return A < B;
 190                 case SLMO_LESSEQUAL:
 191                         return A <= B;
 192                 case SLMO_EQUAL:
 193                         return A == B;
 194                 case SLMO_GREATER:
 195                         return A > B;
 196                 case SLMO_NOTEQUAL:
 197                         return A != B;
 198                 case SLMO_GREATEREQUAL:
 199                 case SLMO_CONTAINS:
 200                 case SLMO_NOTCONTAIN:
 201                         return A >= B;
 202                 default:
 203                         Con_DPrint( "_ServerList_CompareInt: Bad op!\n" );
 204                         return false;
 205         }
 206 }
 207
 208 static qboolean _ServerList_CompareStr( const char *A, serverlist_maskop_t op, const char *B )
 209 {
 210         int i;
 211         char bufferA[ 256 ], bufferB[ 256 ]; // should be more than enough
 212         for (i = 0;i < (int)sizeof(bufferA)-1 && A[i];i++)
 213                 bufferA[i] = (A[i] >= 'A' && A[i] <= 'Z') ? (A[i] + 'a' - 'A') : A[i];
 214         bufferA[i] = 0;
 215         for (i = 0;i < (int)sizeof(bufferB)-1 && B[i];i++)
 216                 bufferB[i] = (B[i] >= 'A' && B[i] <= 'Z') ? (B[i] + 'a' - 'A') : B[i];
 217         bufferB[i] = 0;
 218
 219         // Same here, also using an intermediate & final return would be more appropriate
 220         // A info B mask
 221         switch( op ) {
 222                 case SLMO_CONTAINS:
 223                         return *bufferB && !!strstr( bufferA, bufferB ); // we want a real bool
 224                 case SLMO_NOTCONTAIN:
 225                         return !*bufferB || !strstr( bufferA, bufferB );
 226                 case SLMO_LESS:
 227                         return strcmp( bufferA, bufferB ) < 0;
 228                 case SLMO_LESSEQUAL:
 229                         return strcmp( bufferA, bufferB ) <= 0;
 230                 case SLMO_EQUAL:
 231                         return strcmp( bufferA, bufferB ) == 0;
 232                 case SLMO_GREATER:
 233                         return strcmp( bufferA, bufferB ) > 0;
 234                 case SLMO_NOTEQUAL:
 235                         return strcmp( bufferA, bufferB ) != 0;
 236                 case SLMO_GREATEREQUAL:
 237                         return strcmp( bufferA, bufferB ) >= 0;
 238                 default:
 239                         Con_DPrint( "_ServerList_CompareStr: Bad op!\n" );
 240                         return false;
 241         }
 242 }
 243
 244 static qboolean _ServerList_Entry_Mask( serverlist_mask_t *mask, serverlist_info_t *info )
 245 {
 246         if( !_ServerList_CompareInt( info->ping, mask->tests[SLIF_PING], mask->info.ping ) )
 247                 return false;
 248         if( !_ServerList_CompareInt( info->maxplayers, mask->tests[SLIF_MAXPLAYERS], mask->info.maxplayers ) )
 249                 return false;
 250         if( !_ServerList_CompareInt( info->numplayers, mask->tests[SLIF_NUMPLAYERS], mask->info.numplayers ) )
 251                 return false;
 252         if( !_ServerList_CompareInt( info->protocol, mask->tests[SLIF_PROTOCOL], mask->info.protocol ))
 253                 return false;
 254         if( *mask->info.cname
 255                 && !_ServerList_CompareStr( info->cname, mask->tests[SLIF_CNAME], mask->info.cname ) )
 256                 return false;
 257         if( *mask->info.game
 258                 && !_ServerList_CompareStr( info->game, mask->tests[SLIF_GAME], mask->info.game ) )
 259                 return false;
 260         if( *mask->info.mod
 261                 && !_ServerList_CompareStr( info->mod, mask->tests[SLIF_MOD], mask->info.mod ) )
 262                 return false;
 263         if( *mask->info.map
 264                 && !_ServerList_CompareStr( info->map, mask->tests[SLIF_MAP], mask->info.map ) )
 265                 return false;
 266         if( *mask->info.name
 267                 && !_ServerList_CompareStr( info->name, mask->tests[SLIF_NAME], mask->info.name ) )
 268                 return false;
 269         return true;
 270 }
 271
 272 static void ServerList_ViewList_Insert( serverlist_entry_t *entry )
 273 {
 274         int start, end, mid;
 275
 276         // FIXME: change this to be more readable (...)
 277         // now check whether it passes through the masks
 278         for( start = 0 ; serverlist_andmasks[start].active && start < SERVERLIST_ANDMASKCOUNT ; start++ )
 279                 if( !_ServerList_Entry_Mask( &serverlist_andmasks[start], &entry->info ) )
 280                         return;
 281
 282         for( start = 0 ; serverlist_ormasks[start].active && start < SERVERLIST_ORMASKCOUNT ; start++ )
 283                 if( _ServerList_Entry_Mask( &serverlist_ormasks[start], &entry->info ) )
 284                         break;
 285         if( start == SERVERLIST_ORMASKCOUNT || (start > 0 && !serverlist_ormasks[start].active) )
 286                 return;
 287
 288         if( !serverlist_viewcount ) {
 289                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 290                 return;
 291         }
 292         // ok, insert it, we just need to find out where exactly:
 293
 294         // two special cases
 295         // check whether to insert it as new first item
 296         if( _ServerList_Entry_Compare( entry, serverlist_viewlist[0] ) ) {
 297                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 298                 return;
 299         } // check whether to insert it as new last item
 300         else if( !_ServerList_Entry_Compare( entry, serverlist_viewlist[serverlist_viewcount - 1] ) ) {
 301                 _ServerList_ViewList_Helper_InsertBefore( serverlist_viewcount, entry );
 302                 return;
 303         }
 304         start = 0;
 305         end = serverlist_viewcount - 1;
 306         while( end > start + 1 )
 307         {
 308                 mid = (start + end) / 2;
 309                 // test the item that lies in the middle between start and end
 310                 if( _ServerList_Entry_Compare( entry, serverlist_viewlist[mid] ) )
 311                         // the item has to be in the upper half
 312                         end = mid;
 313                 else
 314                         // the item has to be in the lower half
 315                         start = mid;
 316         }
 317         _ServerList_ViewList_Helper_InsertBefore( start + 1, entry );
 318 }
 319
 320 static void ServerList_ViewList_Remove( serverlist_entry_t *entry )
 321 {
 322         int i;
 323         for( i = 0; i < serverlist_viewcount; i++ )
 324         {
 325                 if (serverlist_viewlist[i] == entry)
 326                 {
 327                         _ServerList_ViewList_Helper_Remove(i);
 328                         break;
 329                 }
 330         }
 331 }
 332
 333 void ServerList_RebuildViewList(void)
 334 {
 335         int i;
 336
 337         serverlist_viewcount = 0;
 338         for( i = 0 ; i < serverlist_cachecount ; i++ )
 339                 if( serverlist_cache[i].query == SQS_QUERIED )
 340                         ServerList_ViewList_Insert( &serverlist_cache[i] );
 341 }
 342
 343 void ServerList_ResetMasks(void)
 344 {
 345         memset( &serverlist_andmasks, 0, sizeof( serverlist_andmasks ) );
 346         memset( &serverlist_ormasks, 0, sizeof( serverlist_ormasks ) );
 347 }
 348
 349 #if 0
 350 static void _ServerList_Test(void)
 351 {
 352         int i;
 353         for( i = 0 ; i < 1024 ; i++ ) {
 354                 memset( &serverlist_cache[serverlist_cachecount], 0, sizeof( serverlist_entry_t ) );
 355                 serverlist_cache[serverlist_cachecount].info.ping = 1000 + 1024 - i;
 356                 dpsnprintf( serverlist_cache[serverlist_cachecount].info.name, sizeof(serverlist_cache[serverlist_cachecount].info.name), "Black's ServerList Test %i", i );
 357                 serverlist_cache[serverlist_cachecount].finished = true;
 358                 sprintf( serverlist_cache[serverlist_cachecount].line1, "%i %s", serverlist_cache[serverlist_cachecount].info.ping, serverlist_cache[serverlist_cachecount].info.name );
 359                 ServerList_ViewList_Insert( &serverlist_cache[serverlist_cachecount] );
 360                 serverlist_cachecount++;
 361         }
 362 }
 363 #endif
 364
 365 void ServerList_QueryList(void)
 366 {
 367         masterquerytime = realtime;
 368         masterquerycount = 0;
 369         masterreplycount = 0;
 370         serverquerycount = 0;
 371         serverreplycount = 0;
 372         serverlist_cachecount = 0;
 373         serverlist_viewcount = 0;
 374         serverlist_consoleoutput = false;
 375
 376         //_ServerList_Test();
 377
 378         NetConn_QueryMasters();
 379 }
 380
 381 // rest
 382
 383 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
 384 {
 385         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
 386         int i;
 387         if (length == 0)
 388                 return 0;
 389         if (cl_netpacketloss.integer)
 390                 for (i = 0;i < cl_numsockets;i++)
 391                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 392                                 return 0;
 393         if (developer_networking.integer)
 394         {
 395                 char addressstring[128], addressstring2[128];
 396                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 397                 if (length > 0)
 398                 {
 399                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 400                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
 401                         Com_HexDumpToConsole((unsigned char *)data, length);
 402                 }
 403                 else
 404                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
 405         }
 406         return length;
 407 }
 408
 409 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 410 {
 411         int ret;
 412         int i;
 413         if (cl_netpacketloss.integer)
 414                 for (i = 0;i < cl_numsockets;i++)
 415                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 416                                 return length;
 417         ret = LHNET_Write(mysocket, data, length, peeraddress);
 418         if (developer_networking.integer)
 419         {
 420                 char addressstring[128], addressstring2[128];
 421                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 422                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 423                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 424                 Com_HexDumpToConsole((unsigned char *)data, length);
 425         }
 426         return ret;
 427 }
 428
 429 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 430 {
 431         // note this does not include the trailing NULL because we add that in the parser
 432         return NetConn_Write(mysocket, string, (int)strlen(string), peeraddress);
 433 }
 434
 435 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
 436 {
 437         unsigned int packetLen;
 438         unsigned int dataLen;
 439         unsigned int eom;
 440         unsigned int *header;
 441
 442 //#ifdef DEBUG
 443         if (data->cursize == 0)
 444         {
 445                 Con_Printf ("Datagram_SendMessage: zero length message\n");
 446                 return -1;
 447         }
 448
 449         if (data->cursize > (int)sizeof(conn->sendMessage))
 450         {
 451                 Con_Printf ("Datagram_SendMessage: message too big (%u > %u)\n", data->cursize, sizeof(conn->sendMessage));
 452                 return -1;
 453         }
 454
 455         if (conn->canSend == false)
 456         {
 457                 Con_Printf ("SendMessage: called with canSend == false\n");
 458                 return -1;
 459         }
 460 //#endif
 461
 462         memcpy(conn->sendMessage, data->data, data->cursize);
 463         conn->sendMessageLength = data->cursize;
 464
 465         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 466         {
 467                 dataLen = conn->sendMessageLength;
 468                 eom = NETFLAG_EOM;
 469         }
 470         else
 471         {
 472                 dataLen = MAX_PACKETFRAGMENT;
 473                 eom = 0;
 474         }
 475
 476         packetLen = NET_HEADERSIZE + dataLen;
 477
 478         header = (unsigned int *)sendbuffer;
 479         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 480         header[1] = BigLong(conn->sendSequence);
 481         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 482
 483         conn->sendSequence++;
 484         conn->canSend = false;
 485
 486         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 487                 return -1;
 488
 489         conn->lastSendTime = realtime;
 490         packetsSent++;
 491         reliableMessagesSent++;
 492         return 1;
 493 }
 494
 495 static void NetConn_SendMessageNext(netconn_t *conn)
 496 {
 497         unsigned int packetLen;
 498         unsigned int dataLen;
 499         unsigned int eom;
 500         unsigned int *header;
 501
 502         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
 503         {
 504                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 505                 {
 506                         dataLen = conn->sendMessageLength;
 507                         eom = NETFLAG_EOM;
 508                 }
 509                 else
 510                 {
 511                         dataLen = MAX_PACKETFRAGMENT;
 512                         eom = 0;
 513                 }
 514
 515                 packetLen = NET_HEADERSIZE + dataLen;
 516
 517                 header = (unsigned int *)sendbuffer;
 518                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 519                 header[1] = BigLong(conn->sendSequence);
 520                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 521
 522                 conn->sendSequence++;
 523                 conn->sendNext = false;
 524
 525                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 526                         return;
 527
 528                 conn->lastSendTime = realtime;
 529                 packetsSent++;
 530         }
 531 }
 532
 533 static void NetConn_ReSendMessage(netconn_t *conn)
 534 {
 535         unsigned int packetLen;
 536         unsigned int dataLen;
 537         unsigned int eom;
 538         unsigned int *header;
 539
 540         if (conn->sendMessageLength && !conn->canSend && (realtime - conn->lastSendTime) > 1.0)
 541         {
 542                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 543                 {
 544                         dataLen = conn->sendMessageLength;
 545                         eom = NETFLAG_EOM;
 546                 }
 547                 else
 548                 {
 549                         dataLen = MAX_PACKETFRAGMENT;
 550                         eom = 0;
 551                 }
 552
 553                 packetLen = NET_HEADERSIZE + dataLen;
 554
 555                 header = (unsigned int *)sendbuffer;
 556                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 557                 header[1] = BigLong(conn->sendSequence - 1);
 558                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 559
 560                 conn->sendNext = false;
 561
 562                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 563                         return;
 564
 565                 conn->lastSendTime = realtime;
 566                 packetsReSent++;
 567         }
 568 }
 569
 570 qboolean NetConn_CanSendMessage(netconn_t *conn)
 571 {
 572         return conn->canSend;
 573 }
 574
 575 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
 576 {
 577         int packetLen;
 578         unsigned int *header;
 579
 580         packetLen = NET_HEADERSIZE + data->cursize;
 581
 582 //#ifdef DEBUG
 583         if (data->cursize == 0)
 584         {
 585                 Con_Printf ("Datagram_SendUnreliableMessage: zero length message\n");
 586                 return -1;
 587         }
 588
 589         if (packetLen > (int)sizeof(sendbuffer))
 590         {
 591                 Con_Printf ("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
 592                 return -1;
 593         }
 594 //#endif
 595
 596         header = (unsigned int *)sendbuffer;
 597         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
 598         header[1] = BigLong(conn->unreliableSendSequence);
 599         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
 600
 601         conn->unreliableSendSequence++;
 602
 603         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 604                 return -1;
 605
 606         packetsSent++;
 607         unreliableMessagesSent++;
 608         return 1;
 609 }
 610
 611 void NetConn_CloseClientPorts(void)
 612 {
 613         for (;cl_numsockets > 0;cl_numsockets--)
 614                 if (cl_sockets[cl_numsockets - 1])
 615                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 616 }
 617
 618 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
 619 {
 620         lhnetaddress_t address;
 621         lhnetsocket_t *s;
 622         char addressstring2[1024];
 623         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 624         {
 625                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 626                 {
 627                         cl_sockets[cl_numsockets++] = s;
 628                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 629                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
 630                 }
 631                 else
 632                 {
 633                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 634                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
 635                 }
 636         }
 637         else
 638                 Con_Printf("Client unable to parse address %s\n", addressstring);
 639 }
 640
 641 void NetConn_OpenClientPorts(void)
 642 {
 643         int port;
 644         NetConn_CloseClientPorts();
 645         port = bound(0, cl_netport.integer, 65535);
 646         if (cl_netport.integer != port)
 647                 Cvar_SetValueQuick(&cl_netport, port);
 648         Con_Printf("Client using port %i\n", port);
 649         NetConn_OpenClientPort("local:2", 0);
 650         NetConn_OpenClientPort(net_address.string, port);
 651         //NetConn_OpenClientPort(net_address_ipv6.string, port);
 652 }
 653
 654 void NetConn_CloseServerPorts(void)
 655 {
 656         for (;sv_numsockets > 0;sv_numsockets--)
 657                 if (sv_sockets[sv_numsockets - 1])
 658                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 659 }
 660
 661 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
 662 {
 663         lhnetaddress_t address;
 664         lhnetsocket_t *s;
 665         int port;
 666         char addressstring2[1024];
 667
 668         for (port = defaultport; port <= defaultport + 100; port++)
 669         {
 670                 if (LHNETADDRESS_FromString(&address, addressstring, port))
 671                 {
 672                         if ((s = LHNET_OpenSocket_Connectionless(&address)))
 673                         {
 674                                 sv_sockets[sv_numsockets++] = s;
 675                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 676                                 Con_Printf("Server listening on address %s\n", addressstring2);
 677                                 break;
 678                         }
 679                         else
 680                         {
 681                                 LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 682                                 Con_Printf("Server failed to open socket on address %s\n", addressstring2);
 683                         }
 684                 }
 685                 else
 686                 {
 687                         Con_Printf("Server unable to parse address %s\n", addressstring);
 688                         // if it cant parse one address, it wont be able to parse another for sure
 689                         break;
 690                 }
 691         }
 692 }
 693
 694 void NetConn_OpenServerPorts(int opennetports)
 695 {
 696         int port;
 697         NetConn_CloseServerPorts();
 698         NetConn_UpdateSockets();
 699         port = bound(0, sv_netport.integer, 65535);
 700         if (port == 0)
 701                 port = 26000;
 702         Con_Printf("Server using port %i\n", port);
 703         if (sv_netport.integer != port)
 704                 Cvar_SetValueQuick(&sv_netport, port);
 705         if (cls.state != ca_dedicated)
 706                 NetConn_OpenServerPort("local:1", 0);
 707         if (opennetports)
 708         {
 709                 NetConn_OpenServerPort(net_address.string, port);
 710                 //NetConn_OpenServerPort(net_address_ipv6.string, port);
 711         }
 712         if (sv_numsockets == 0)
 713                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!");
 714 }
 715
 716 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 717 {
 718         int i, a = LHNETADDRESS_GetAddressType(address);
 719         for (i = 0;i < cl_numsockets;i++)
 720                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 721                         return cl_sockets[i];
 722         return NULL;
 723 }
 724
 725 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 726 {
 727         int i, a = LHNETADDRESS_GetAddressType(address);
 728         for (i = 0;i < sv_numsockets;i++)
 729                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 730                         return sv_sockets[i];
 731         return NULL;
 732 }
 733
 734 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 735 {
 736         netconn_t *conn;
 737         conn = (netconn_t *)Mem_Alloc(netconn_mempool, sizeof(*conn));
 738         conn->mysocket = mysocket;
 739         conn->peeraddress = *peeraddress;
 740         conn->canSend = true;
 741         conn->lastMessageTime = realtime;
 742         conn->message.data = conn->messagedata;
 743         conn->message.maxsize = sizeof(conn->messagedata);
 744         conn->message.cursize = 0;
 745         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
 746         // reduce effectiveness of connection request floods
 747         conn->timeout = realtime + net_connecttimeout.value;
 748         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
 749         conn->next = netconn_list;
 750         netconn_list = conn;
 751         return conn;
 752 }
 753
 754 void NetConn_Close(netconn_t *conn)
 755 {
 756         netconn_t *c;
 757         // remove connection from list
 758         if (conn == netconn_list)
 759                 netconn_list = conn->next;
 760         else
 761         {
 762                 for (c = netconn_list;c;c = c->next)
 763                 {
 764                         if (c->next == conn)
 765                         {
 766                                 c->next = conn->next;
 767                                 break;
 768                         }
 769                 }
 770                 // not found in list, we'll avoid crashing here...
 771                 if (!c)
 772                         return;
 773         }
 774         // free connection
 775         Mem_Free(conn);
 776 }
 777
 778 static int clientport = -1;
 779 static int clientport2 = -1;
 780 static int hostport = -1;
 781 void NetConn_UpdateSockets(void)
 782 {
 783         if (cls.state != ca_dedicated)
 784         {
 785                 if (clientport2 != cl_netport.integer)
 786                 {
 787                         clientport2 = cl_netport.integer;
 788                         if (cls.state == ca_connected)
 789                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
 790                 }
 791                 if (cls.state == ca_disconnected && clientport != clientport2)
 792                 {
 793                         clientport = clientport2;
 794                         NetConn_CloseClientPorts();
 795                 }
 796                 if (cl_numsockets == 0)
 797                         NetConn_OpenClientPorts();
 798         }
 799
 800         if (hostport != sv_netport.integer)
 801         {
 802                 hostport = sv_netport.integer;
 803                 if (sv.active)
 804                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
 805         }
 806 }
 807
 808 int NetConn_ReceivedMessage(netconn_t *conn, unsigned char *data, int length)
 809 {
 810         unsigned int count;
 811         unsigned int flags;
 812         unsigned int sequence;
 813         int qlength;
 814
 815         if (length >= 8)
 816         {
 817                 qlength = (unsigned int)BigLong(((int *)data)[0]);
 818                 flags = qlength & ~NETFLAG_LENGTH_MASK;
 819                 qlength &= NETFLAG_LENGTH_MASK;
 820                 // control packets were already handled
 821                 if (!(flags & NETFLAG_CTL) && qlength == length)
 822                 {
 823                         sequence = BigLong(((int *)data)[1]);
 824                         packetsReceived++;
 825                         data += 8;
 826                         length -= 8;
 827                         if (flags & NETFLAG_UNRELIABLE)
 828                         {
 829                                 if (sequence >= conn->unreliableReceiveSequence)
 830                                 {
 831                                         if (sequence > conn->unreliableReceiveSequence)
 832                                         {
 833                                                 count = sequence - conn->unreliableReceiveSequence;
 834                                                 droppedDatagrams += count;
 835                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
 836                                         }
 837                                         conn->unreliableReceiveSequence = sequence + 1;
 838                                         conn->lastMessageTime = realtime;
 839                                         conn->timeout = realtime + net_messagetimeout.value;
 840                                         unreliableMessagesReceived++;
 841                                         if (length > 0)
 842                                         {
 843                                                 SZ_Clear(&net_message);
 844                                                 SZ_Write(&net_message, data, length);
 845                                                 MSG_BeginReading();
 846                                                 return 2;
 847                                         }
 848                                 }
 849                                 else
 850                                         Con_DPrint("Got a stale datagram\n");
 851                                 return 1;
 852                         }
 853                         else if (flags & NETFLAG_ACK)
 854                         {
 855                                 if (sequence == (conn->sendSequence - 1))
 856                                 {
 857                                         if (sequence == conn->ackSequence)
 858                                         {
 859                                                 conn->ackSequence++;
 860                                                 if (conn->ackSequence != conn->sendSequence)
 861                                                         Con_DPrint("ack sequencing error\n");
 862                                                 conn->lastMessageTime = realtime;
 863                                                 conn->timeout = realtime + net_messagetimeout.value;
 864                                                 conn->sendMessageLength -= MAX_PACKETFRAGMENT;
 865                                                 if (conn->sendMessageLength > 0)
 866                                                 {
 867                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
 868                                                         conn->sendNext = true;
 869                                                         NetConn_SendMessageNext(conn);
 870                                                 }
 871                                                 else
 872                                                 {
 873                                                         conn->sendMessageLength = 0;
 874                                                         conn->canSend = true;
 875                                                 }
 876                                         }
 877                                         else
 878                                                 Con_DPrint("Duplicate ACK received\n");
 879                                 }
 880                                 else
 881                                         Con_DPrint("Stale ACK received\n");
 882                                 return 1;
 883                         }
 884                         else if (flags & NETFLAG_DATA)
 885                         {
 886                                 unsigned int temppacket[2];
 887                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
 888                                 temppacket[1] = BigLong(sequence);
 889                                 NetConn_Write(conn->mysocket, (unsigned char *)temppacket, 8, &conn->peeraddress);
 890                                 if (sequence == conn->receiveSequence)
 891                                 {
 892                                         conn->lastMessageTime = realtime;
 893                                         conn->timeout = realtime + net_messagetimeout.value;
 894                                         conn->receiveSequence++;
 895                                         if( conn->receiveMessageLength + length <= (int)sizeof( conn->receiveMessage ) ) {
 896                                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
 897                                                 conn->receiveMessageLength += length;
 898                                         } else {
 899                                                 Con_Printf( "Reliable message (seq: %i) too big for message buffer!\n"
 900                                                                         "Dropping the message!\n", sequence );
 901                                                 conn->receiveMessageLength = 0;
 902                                                 return 1;
 903                                         }
 904                                         if (flags & NETFLAG_EOM)
 905                                         {
 906                                                 reliableMessagesReceived++;
 907                                                 length = conn->receiveMessageLength;
 908                                                 conn->receiveMessageLength = 0;
 909                                                 if (length > 0)
 910                                                 {
 911                                                         SZ_Clear(&net_message);
 912                                                         SZ_Write(&net_message, conn->receiveMessage, length);
 913                                                         MSG_BeginReading();
 914                                                         return 2;
 915                                                 }
 916                                         }
 917                                 }
 918                                 else
 919                                         receivedDuplicateCount++;
 920                                 return 1;
 921                         }
 922                 }
 923         }
 924         return 0;
 925 }
 926
 927 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 928 {
 929         cls.connect_trying = false;
 930         M_Update_Return_Reason("");
 931         // the connection request succeeded, stop current connection and set up a new connection
 932         CL_Disconnect();
 933         // if we're connecting to a remote server, shut down any local server
 934         if (LHNETADDRESS_GetAddressType(peeraddress) != LHNETADDRESSTYPE_LOOP && sv.active)
 935                 Host_ShutdownServer ();
 936         // allocate a net connection to keep track of things
 937         cls.netcon = NetConn_Open(mysocket, peeraddress);
 938         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
 939         key_dest = key_game;
 940         m_state = m_none;
 941         cls.demonum = -1;                       // not in the demo loop now
 942         cls.state = ca_connected;
 943         cls.signon = 0;                         // need all the signon messages before playing
 944 }
 945
 946 int NetConn_IsLocalGame(void)
 947 {
 948         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
 949                 return true;
 950         return false;
 951 }
 952
 953 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
 954 {
 955         int ret, c, control;
 956         const char *s;
 957         char *string, addressstring2[128], cname[128], ipstring[32];
 958         char stringbuf[16384];
 959
 960         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 961         {
 962                 // received a command string - strip off the packaging and put it
 963                 // into our string buffer with NULL termination
 964                 data += 4;
 965                 length -= 4;
 966                 length = min(length, (int)sizeof(stringbuf) - 1);
 967                 memcpy(stringbuf, data, length);
 968                 stringbuf[length] = 0;
 969                 string = stringbuf;
 970
 971                 if (developer.integer)
 972                 {
 973                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 974                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
 975                         Com_HexDumpToConsole(data, length);
 976                 }
 977
 978                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
 979                 {
 980                         char protocolnames[1400];
 981                         Protocol_Names(protocolnames, sizeof(protocolnames));
 982                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 983                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
 984                         M_Update_Return_Reason("Got challenge response");
 985                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\protocols\\%s\\challenge\\%s", protocolnames, string + 10), peeraddress);
 986                         return true;
 987                 }
 988                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
 989                 {
 990                         M_Update_Return_Reason("Accepted");
 991                         NetConn_ConnectionEstablished(mysocket, peeraddress);
 992                         return true;
 993                 }
 994                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
 995                 {
 996                         char rejectreason[32];
 997                         cls.connect_trying = false;
 998                         string += 7;
 999                         length = max(length - 7, (int)sizeof(rejectreason) - 1);
1000                         memcpy(rejectreason, string, length);
1001                         rejectreason[length] = 0;
1002                         M_Update_Return_Reason(rejectreason);
1003                         return true;
1004                 }
1005                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1006                 {
1007                         serverlist_info_t *info;
1008                         int n;
1009                         double pingtime;
1010
1011                         string += 13;
1012                         // serverlist only uses text addresses
1013                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
1014                         // search the cache for this server and update it
1015                         for( n = 0; n < serverlist_cachecount; n++ )
1016                                 if( !strcmp( cname, serverlist_cache[n].info.cname ) )
1017                                         break;
1018                         if( n == serverlist_cachecount ) {
1019                                 // LAN search doesnt require an answer from the master server so we wont
1020                                 // know the ping nor will it be initialized already...
1021
1022                                 // find a slot
1023                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1024                                         return true;
1025
1026                                 memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1027                                 // store the data the engine cares about (address and ping)
1028                                 strlcpy (serverlist_cache[serverlist_cachecount].info.cname, cname, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1029                                 serverlist_cache[serverlist_cachecount].info.ping = 100000;
1030                                 serverlist_cache[serverlist_cachecount].querytime = realtime;
1031                                 // if not in the slist menu we should print the server to console
1032                                 if (serverlist_consoleoutput) {
1033                                         Con_Printf("querying %s\n", ipstring);
1034                                 }
1035
1036                                 ++serverlist_cachecount;
1037                         }
1038
1039                         info = &serverlist_cache[n].info;
1040                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));else info->game[0] = 0;
1041                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1042                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1043                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1044                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);else info->protocol = -1;
1045                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);else info->numplayers = 0;
1046                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1047
1048                         if (info->ping == 100000)
1049                                         serverreplycount++;
1050
1051                         pingtime = (int)((realtime - serverlist_cache[n].querytime) * 1000.0);
1052                         pingtime = bound(0, pingtime, 9999);
1053                         // update the ping
1054                         info->ping = pingtime;
1055
1056                         // legacy/old stuff move it to the menu ASAP
1057
1058                         // build description strings for the things users care about
1059                         dpsnprintf(serverlist_cache[n].line1, sizeof(serverlist_cache[n].line1), "%c%c%5d%c%c%c%3u/%3u %-65.65s", STRING_COLOR_TAG, pingtime >= 300 ? '1' : (pingtime >= 200 ? '3' : '7'), (int)pingtime, STRING_COLOR_TAG, STRING_COLOR_DEFAULT + '0', info->protocol != NET_PROTOCOL_VERSION ? '*' : ' ', info->numplayers, info->maxplayers, info->name);
1060                         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);
1061                         if( serverlist_cache[n].query == SQS_QUERIED ) {
1062                                 ServerList_ViewList_Remove( &serverlist_cache[n] );
1063                         }
1064                         // if not in the slist menu we should print the server to console (if wanted)
1065                         else if( serverlist_consoleoutput )
1066                                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1067                         // and finally, update the view set
1068                         ServerList_ViewList_Insert( &serverlist_cache[n] );
1069                         serverlist_cache[n].query = SQS_QUERIED;
1070
1071                         return true;
1072                 }
1073                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1074                 {
1075                         // Extract the IP addresses
1076                         data += 18;
1077                         length -= 18;
1078                         masterreplycount++;
1079                         if (serverlist_consoleoutput)
1080                                 Con_Print("received server list...\n");
1081                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
1082                         {
1083                                 int n;
1084
1085                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
1086                                 if (developer.integer)
1087                                         Con_Printf("Requesting info from server %s\n", ipstring);
1088                                 // ignore the rest of the message if the serverlist is full
1089                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1090                                         break;
1091                                 // also ignore it if we have already queried it (other master server response)
1092                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1093                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1094                                                 break;
1095                                 if( n >= serverlist_cachecount )
1096                                 {
1097                                         serverquerycount++;
1098
1099                                         memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1100                                         // store the data the engine cares about (address and ping)
1101                                         strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1102                                         serverlist_cache[serverlist_cachecount].info.ping = 100000;
1103                                         serverlist_cache[serverlist_cachecount].query = SQS_QUERYING;
1104
1105                                         ++serverlist_cachecount;
1106                                 }
1107
1108                                 // move on to next address in packet
1109                                 data += 7;
1110                                 length -= 7;
1111                         }
1112                         // begin or resume serverlist queries
1113                         serverlist_querysleep = false;
1114                         return true;
1115                 }
1116                 /*
1117                 if (!strncmp(string, "ping", 4))
1118                 {
1119                         if (developer.integer)
1120                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1121                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1122                         return true;
1123                 }
1124                 if (!strncmp(string, "ack", 3))
1125                         return true;
1126                 */
1127                 // we may not have liked the packet, but it was a command packet, so
1128                 // we're done processing this packet now
1129                 return true;
1130         }
1131         // netquake control packets, supported for compatibility only
1132         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1133         {
1134                 c = data[4];
1135                 data += 5;
1136                 length -= 5;
1137                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1138                 switch (c)
1139                 {
1140                 case CCREP_ACCEPT:
1141                         if (developer.integer)
1142                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
1143                         if (cls.connect_trying)
1144                         {
1145                                 lhnetaddress_t clientportaddress;
1146                                 clientportaddress = *peeraddress;
1147                                 if (length >= 4)
1148                                 {
1149                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
1150                                         data += 4;
1151                                         length -= 4;
1152                                         LHNETADDRESS_SetPort(&clientportaddress, port);
1153                                 }
1154                                 M_Update_Return_Reason("Accepted");
1155                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress);
1156                         }
1157                         break;
1158                 case CCREP_REJECT:
1159                         if (developer.integer)
1160                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1161                         cls.connect_trying = false;
1162                         M_Update_Return_Reason((char *)data);
1163                         break;
1164 #if 0
1165                 case CCREP_SERVER_INFO:
1166                         if (developer.integer)
1167                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1168                         if (cls.state != ca_dedicated)
1169                         {
1170                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
1171                                 // string we just ignore it and keep the real address
1172                                 MSG_ReadString();
1173                                 // serverlist only uses text addresses
1174                                 cname = UDP_AddrToString(readaddr);
1175                                 // search the cache for this server
1176                                 for (n = 0; n < hostCacheCount; n++)
1177                                         if (!strcmp(cname, serverlist[n].cname))
1178                                                 break;
1179                                 // add it
1180                                 if (n == hostCacheCount && hostCacheCount < SERVERLISTSIZE)
1181                                 {
1182                                         hostCacheCount++;
1183                                         memset(&serverlist[n], 0, sizeof(serverlist[n]));
1184                                         strlcpy (serverlist[n].name, MSG_ReadString(), sizeof (serverlist[n].name));
1185                                         strlcpy (serverlist[n].map, MSG_ReadString(), sizeof (serverlist[n].map));
1186                                         serverlist[n].users = MSG_ReadByte();
1187                                         serverlist[n].maxusers = MSG_ReadByte();
1188                                         c = MSG_ReadByte();
1189                                         if (c != NET_PROTOCOL_VERSION)
1190                                         {
1191                                                 strlcpy (serverlist[n].cname, serverlist[n].name, sizeof (serverlist[n].cname));
1192                                                 strcpy(serverlist[n].name, "*");
1193                                                 strlcat (serverlist[n].name, serverlist[n].cname, sizeof(serverlist[n].name));
1194                                         }
1195                                         strlcpy (serverlist[n].cname, cname, sizeof (serverlist[n].cname));
1196                                 }
1197                         }
1198                         break;
1199                 case CCREP_PLAYER_INFO:
1200                         // we got a CCREP_PLAYER_INFO??
1201                         //if (developer.integer)
1202                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1203                         break;
1204                 case CCREP_RULE_INFO:
1205                         // we got a CCREP_RULE_INFO??
1206                         //if (developer.integer)
1207                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1208                         break;
1209 #endif
1210                 default:
1211                         break;
1212                 }
1213                 // we may not have liked the packet, but it was a valid control
1214                 // packet, so we're done processing this packet now
1215                 return true;
1216         }
1217         ret = 0;
1218         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)
1219                 CL_ParseServerMessage();
1220         return ret;
1221 }
1222
1223 void NetConn_QueryQueueFrame(void)
1224 {
1225         int index;
1226         int queries;
1227         int maxqueries;
1228         double timeouttime;
1229         static double querycounter = 0;
1230
1231         if (serverlist_querysleep)
1232                 return;
1233
1234         // each time querycounter reaches 1.0 issue a query
1235         querycounter += host_realframetime * net_slist_queriespersecond.value;
1236         maxqueries = (int)querycounter;
1237         maxqueries = bound(0, maxqueries, net_slist_queriesperframe.integer);
1238         querycounter -= maxqueries;
1239
1240         if( maxqueries == 0 ) {
1241                 return;
1242         }
1243
1244         // scan serverlist and issue queries as needed
1245     serverlist_querysleep = true;
1246
1247         timeouttime = realtime - net_slist_timeout.value;
1248         for( index = 0, queries = 0 ; index < serverlist_cachecount && queries < maxqueries ; index++ )
1249         {
1250                 serverlist_entry_t *entry = &serverlist_cache[ index ];
1251                 if( entry->query != SQS_QUERYING )
1252                 {
1253                         continue;
1254                 }
1255
1256         serverlist_querysleep = false;
1257                 if( entry->querycounter != 0 && entry->querytime > timeouttime )
1258                 {
1259                         continue;
1260                 }
1261
1262                 if( entry->querycounter != (unsigned) net_slist_maxtries.integer )
1263                 {
1264                         lhnetaddress_t address;
1265                         int socket;
1266
1267                         LHNETADDRESS_FromString(&address, entry->info.cname, 0);
1268                         for (socket = 0; socket < cl_numsockets ; socket++) {
1269                                 NetConn_WriteString(cl_sockets[socket], "\377\377\377\377getinfo", &address);
1270                         }
1271
1272                         entry->querytime = realtime;
1273                         entry->querycounter++;
1274
1275                         // if not in the slist menu we should print the server to console
1276                         if (serverlist_consoleoutput)
1277                                 Con_Printf("querying %25s (%i. try)\n", entry->info.cname, entry->querycounter);
1278
1279                         queries++;
1280                 }
1281                 else
1282                 {
1283                         entry->query = SQS_TIMEDOUT;
1284                 }
1285         }
1286 }
1287
1288 void NetConn_ClientFrame(void)
1289 {
1290         int i, length;
1291         lhnetaddress_t peeraddress;
1292         netconn_t *conn;
1293         NetConn_UpdateSockets();
1294         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
1295         {
1296                 if (cls.connect_remainingtries == 0)
1297                         M_Update_Return_Reason("Connect: Waiting 10 seconds for reply");
1298                 cls.connect_nextsendtime = realtime + 1;
1299                 cls.connect_remainingtries--;
1300                 if (cls.connect_remainingtries <= -10)
1301                 {
1302                         cls.connect_trying = false;
1303                         M_Update_Return_Reason("Connect: Failed");
1304                         return;
1305                 }
1306                 // try challenge first (newer server)
1307                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
1308                 // then try netquake as a fallback (old server, or netquake)
1309                 SZ_Clear(&net_message);
1310                 // save space for the header, filled in later
1311                 MSG_WriteLong(&net_message, 0);
1312                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
1313                 MSG_WriteString(&net_message, "QUAKE");
1314                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1315                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1316                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
1317                 SZ_Clear(&net_message);
1318         }
1319         for (i = 0;i < cl_numsockets;i++) {
1320                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0) {
1321                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
1322                 }
1323         }
1324         NetConn_QueryQueueFrame();
1325         if (cls.netcon && realtime > cls.netcon->timeout)
1326         {
1327                 Con_Print("Connection timed out\n");
1328                 CL_Disconnect();
1329                 Host_ShutdownServer ();
1330         }
1331         for (conn = netconn_list;conn;conn = conn->next)
1332                 NetConn_ReSendMessage(conn);
1333 }
1334
1335 #define MAX_CHALLENGES 128
1336 struct challenge_s
1337 {
1338         lhnetaddress_t address;
1339         double time;
1340         char string[12];
1341 }
1342 challenge[MAX_CHALLENGES];
1343
1344 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
1345 {
1346         int i;
1347         char c;
1348         for (i = 0;i < bufferlength - 1;i++)
1349         {
1350                 do
1351                 {
1352                         c = rand () % (127 - 33) + 33;
1353                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
1354                 buffer[i] = c;
1355         }
1356         buffer[i] = 0;
1357 }
1358
1359 static qboolean NetConn_BuildStatusResponse(const char* challenge, char* out_msg, size_t out_size, qboolean fullstatus)
1360 {
1361         unsigned int nb_clients = 0, i;
1362         int length;
1363
1364         // How many clients are there?
1365         for (i = 0;i < (unsigned int)svs.maxclients;i++)
1366                 if (svs.clients[i].active)
1367                         nb_clients++;
1368
1369         // TODO: we should add more information for the full status string
1370         length = dpsnprintf(out_msg, out_size,
1371                                                 "\377\377\377\377%s\x0A"
1372                                                 "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
1373                                                 "\\clients\\%d\\mapname\\%s\\hostname\\%s""\\protocol\\%d"
1374                                                 "%s%s"
1375                                                 "%s",
1376                                                 fullstatus ? "statusResponse" : "infoResponse",
1377                                                 gamename, com_modname, svs.maxclients,
1378                                                 nb_clients, sv.name, hostname.string, NET_PROTOCOL_VERSION,
1379                                                 challenge ? "\\challenge\\" : "", challenge ? challenge : "",
1380                                                 fullstatus ? "\n" : "");
1381
1382         // Make sure it fits in the buffer
1383         if (length < 0)
1384                 return false;
1385
1386         if (fullstatus)
1387         {
1388                 char *ptr;
1389                 int left;
1390
1391                 ptr = out_msg + length;
1392                 left = (int)out_size - length;
1393
1394                 for (i = 0;i < (unsigned int)svs.maxclients;i++)
1395                 {
1396                         client_t *cl = &svs.clients[i];
1397                         if (cl->active)
1398                         {
1399                                 int nameind, cleanind;
1400                                 char curchar;
1401                                 char cleanname [sizeof(cl->name)];
1402
1403                                 // Remove all characters '"' and '\' in the player name
1404                                 nameind = 0;
1405                                 cleanind = 0;
1406                                 do
1407                                 {
1408                                         curchar = cl->name[nameind++];
1409                                         if (curchar != '"' && curchar != '\\')
1410                                         {
1411                                                 cleanname[cleanind++] = curchar;
1412                                                 if (cleanind == sizeof(cleanname) - 1)
1413                                                         break;
1414                                         }
1415                                 } while (curchar != '\0');
1416
1417                                 length = dpsnprintf(ptr, left, "%d %d \"%s\"\n",
1418                                                                         cl->frags,
1419                                                                         (int)(cl->ping * 1000.0f),
1420                                                                         cleanname);
1421                                 if(length < 0)
1422                                         return false;
1423                                 left -= length;
1424                                 ptr += length;
1425                         }
1426                 }
1427         }
1428
1429         return true;
1430 }
1431
1432 extern void SV_SendServerinfo (client_t *client);
1433 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1434 {
1435         int i, ret, clientnum, best;
1436         double besttime;
1437         client_t *client;
1438         netconn_t *conn;
1439         char *s, *string, response[512], addressstring2[128], stringbuf[16384];
1440
1441         if (sv.active)
1442         {
1443                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1444                 {
1445                         // received a command string - strip off the packaging and put it
1446                         // into our string buffer with NULL termination
1447                         data += 4;
1448                         length -= 4;
1449                         length = min(length, (int)sizeof(stringbuf) - 1);
1450                         memcpy(stringbuf, data, length);
1451                         stringbuf[length] = 0;
1452                         string = stringbuf;
1453
1454                         if (developer.integer)
1455                         {
1456                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1457                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1458                                 Com_HexDumpToConsole(data, length);
1459                         }
1460
1461                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
1462                         {
1463                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1464                                 {
1465                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1466                                                 break;
1467                                         if (besttime > challenge[i].time)
1468                                                 besttime = challenge[best = i].time;
1469                                 }
1470                                 // if we did not find an exact match, choose the oldest and
1471                                 // update address and string
1472                                 if (i == MAX_CHALLENGES)
1473                                 {
1474                                         i = best;
1475                                         challenge[i].address = *peeraddress;
1476                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1477                                 }
1478                                 challenge[i].time = realtime;
1479                                 // send the challenge
1480                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1481                                 return true;
1482                         }
1483                         if (length > 8 && !memcmp(string, "connect\\", 8))
1484                         {
1485                                 string += 7;
1486                                 length -= 7;
1487                                 if ((s = SearchInfostring(string, "challenge")))
1488                                 {
1489                                         // validate the challenge
1490                                         for (i = 0;i < MAX_CHALLENGES;i++)
1491                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1492                                                         break;
1493                                         if (i < MAX_CHALLENGES)
1494                                         {
1495                                                 // check engine protocol
1496                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1497                                                 {
1498                                                         if (developer.integer)
1499                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1500                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1501                                                 }
1502                                                 else
1503                                                 {
1504                                                         // see if this is a duplicate connection request
1505                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1506                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1507                                                                         break;
1508                                                         if (clientnum < svs.maxclients && realtime - client->connecttime < net_messagerejointimeout.value)
1509                                                         {
1510                                                                 // client is still trying to connect,
1511                                                                 // so we send a duplicate reply
1512                                                                 if (developer.integer)
1513                                                                         Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1514                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1515                                                         }
1516 #if 0
1517                                                         else if (clientnum < svs.maxclients)
1518                                                         {
1519                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1520                                                                 {
1521                                                                         // client crashed and is coming back, keep their stuff intact
1522                                                                         SV_SendServerinfo(client);
1523                                                                         //host_client = client;
1524                                                                         //SV_DropClient (true);
1525                                                                 }
1526                                                                 // else ignore them
1527                                                         }
1528 #endif
1529                                                         else
1530                                                         {
1531                                                                 // this is a new client, find a slot
1532                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1533                                                                         if (!client->active)
1534                                                                                 break;
1535                                                                 if (clientnum < svs.maxclients)
1536                                                                 {
1537                                                                         // prepare the client struct
1538                                                                         if ((conn = NetConn_Open(mysocket, peeraddress)))
1539                                                                         {
1540                                                                                 // allocated connection
1541                                                                                 LHNETADDRESS_ToString(peeraddress, conn->address, sizeof(conn->address), true);
1542                                                                                 if (developer.integer)
1543                                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1544                                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1545                                                                                 // now set up the client
1546                                                                                 SV_ConnectClient(clientnum, conn);
1547                                                                                 NetConn_Heartbeat(1);
1548                                                                         }
1549                                                                 }
1550                                                                 else
1551                                                                 {
1552                                                                         // server is full
1553                                                                         if (developer.integer)
1554                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1555                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1556                                                                 }
1557                                                         }
1558                                                 }
1559                                         }
1560                                 }
1561                                 return true;
1562                         }
1563                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1564                         {
1565                                 const char *challenge = NULL;
1566
1567                                 // If there was a challenge in the getinfo message
1568                                 if (length > 8 && string[7] == ' ')
1569                                         challenge = string + 8;
1570
1571                                 if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), false))
1572                                 {
1573                                         if (developer.integer)
1574                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1575                                         NetConn_WriteString(mysocket, response, peeraddress);
1576                                 }
1577                                 return true;
1578                         }
1579                         if (length >= 9 && !memcmp(string, "getstatus", 9))
1580                         {
1581                                 const char *challenge = NULL;
1582
1583                                 // If there was a challenge in the getinfo message
1584                                 if (length > 10 && string[9] == ' ')
1585                                         challenge = string + 10;
1586
1587                                 if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), true))
1588                                 {
1589                                         if (developer.integer)
1590                                                 Con_Printf("Sending reply to client %s - %s\n", addressstring2, response);
1591                                         NetConn_WriteString(mysocket, response, peeraddress);
1592                                 }
1593                                 return true;
1594                         }
1595                         /*
1596                         if (!strncmp(string, "ping", 4))
1597                         {
1598                                 if (developer.integer)
1599                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1600                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1601                                 return true;
1602                         }
1603                         if (!strncmp(string, "ack", 3))
1604                                 return true;
1605                         */
1606                         // we may not have liked the packet, but it was a command packet, so
1607                         // we're done processing this packet now
1608                         return true;
1609                 }
1610                 // LordHavoc: disabled netquake control packet support in server
1611 #if 0
1612                 {
1613                         int c, control;
1614                         // netquake control packets, supported for compatibility only
1615                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1616                         {
1617                                 c = data[4];
1618                                 data += 5;
1619                                 length -= 5;
1620                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1621                                 switch (c)
1622                                 {
1623                                 case CCREQ_CONNECT:
1624                                         //if (developer.integer)
1625                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1626                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
1627                                         {
1628                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1629                                                 {
1630                                                         if (developer.integer)
1631                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1632                                                         SZ_Clear(&net_message);
1633                                                         // save space for the header, filled in later
1634                                                         MSG_WriteLong(&net_message, 0);
1635                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1636                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
1637                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1638                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1639                                                         SZ_Clear(&net_message);
1640                                                 }
1641                                                 else
1642                                                 {
1643                                                         // see if this is a duplicate connection request
1644                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1645                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1646                                                                         break;
1647                                                         if (clientnum < svs.maxclients)
1648                                                         {
1649                                                                 // duplicate connection request
1650                                                                 if (realtime - client->connecttime < 2.0)
1651                                                                 {
1652                                                                         // client is still trying to connect,
1653                                                                         // so we send a duplicate reply
1654                                                                         if (developer.integer)
1655                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1656                                                                         SZ_Clear(&net_message);
1657                                                                         // save space for the header, filled in later
1658                                                                         MSG_WriteLong(&net_message, 0);
1659                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1660                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1661                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1662                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1663                                                                         SZ_Clear(&net_message);
1664                                                                 }
1665 #if 0
1666                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1667                                                                 {
1668                                                                         SV_SendServerinfo(client);
1669                                                                         // the old client hasn't sent us anything
1670                                                                         // in quite a while, so kick off and let
1671                                                                         // the retry take care of it...
1672                                                                         //host_client = client;
1673                                                                         //SV_DropClient (true);
1674                                                                 }
1675 #endif
1676                                                         }
1677                                                         else
1678                                                         {
1679                                                                 // this is a new client, find a slot
1680                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1681                                                                         if (!client->active)
1682                                                                                 break;
1683                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
1684                                                                 {
1685                                                                         // connect to the client
1686                                                                         // everything is allocated, just fill in the details
1687                                                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
1688                                                                         if (developer.integer)
1689                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
1690                                                                         // send back the info about the server connection
1691                                                                         SZ_Clear(&net_message);
1692                                                                         // save space for the header, filled in later
1693                                                                         MSG_WriteLong(&net_message, 0);
1694                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1695                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
1696                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1697                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1698                                                                         SZ_Clear(&net_message);
1699                                                                         // now set up the client struct
1700                                                                         SV_ConnectClient(clientnum, conn);
1701                                                                         NetConn_Heartbeat(1);
1702                                                                 }
1703                                                                 else
1704                                                                 {
1705                                                                         //if (developer.integer)
1706                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
1707                                                                         // no room; try to let player know
1708                                                                         SZ_Clear(&net_message);
1709                                                                         // save space for the header, filled in later
1710                                                                         MSG_WriteLong(&net_message, 0);
1711                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1712                                                                         MSG_WriteString(&net_message, "Server is full.\n");
1713                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1714                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1715                                                                         SZ_Clear(&net_message);
1716                                                                 }
1717                                                         }
1718                                                 }
1719                                         }
1720                                         break;
1721 #if 0
1722                                 case CCREQ_SERVER_INFO:
1723                                         if (developer.integer)
1724                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
1725                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
1726                                         {
1727                                                 if (developer.integer)
1728                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
1729                                                 SZ_Clear(&net_message);
1730                                                 // save space for the header, filled in later
1731                                                 MSG_WriteLong(&net_message, 0);
1732                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1733                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1734                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1735                                                 MSG_WriteString(&net_message, hostname.string);
1736                                                 MSG_WriteString(&net_message, sv.name);
1737                                                 MSG_WriteByte(&net_message, net_activeconnections);
1738                                                 MSG_WriteByte(&net_message, svs.maxclients);
1739                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1740                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1741                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1742                                                 SZ_Clear(&net_message);
1743                                         }
1744                                         break;
1745                                 case CCREQ_PLAYER_INFO:
1746                                         if (developer.integer)
1747                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1748                                         if (sv.active)
1749                                         {
1750                                                 int playerNumber, activeNumber, clientNumber;
1751                                                 client_t *client;
1752
1753                                                 playerNumber = MSG_ReadByte();
1754                                                 activeNumber = -1;
1755                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1756                                                         if (client->active && ++activeNumber == playerNumber)
1757                                                                 break;
1758                                                 if (clientNumber != svs.maxclients)
1759                                                 {
1760                                                         SZ_Clear(&net_message);
1761                                                         // save space for the header, filled in later
1762                                                         MSG_WriteLong(&net_message, 0);
1763                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1764                                                         MSG_WriteByte(&net_message, playerNumber);
1765                                                         MSG_WriteString(&net_message, client->name);
1766                                                         MSG_WriteLong(&net_message, client->colors);
1767                                                         MSG_WriteLong(&net_message, (int)client->edict->fields.server->frags);
1768                                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
1769                                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
1770                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1771                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1772                                                         SZ_Clear(&net_message);
1773                                                 }
1774                                         }
1775                                         break;
1776                                 case CCREQ_RULE_INFO:
1777                                         if (developer.integer)
1778                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1779                                         if (sv.active)
1780                                         {
1781                                                 char *prevCvarName;
1782                                                 cvar_t *var;
1783
1784                                                 // find the search start location
1785                                                 prevCvarName = MSG_ReadString();
1786                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1787
1788                                                 // send the response
1789                                                 SZ_Clear(&net_message);
1790                                                 // save space for the header, filled in later
1791                                                 MSG_WriteLong(&net_message, 0);
1792                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1793                                                 if (var)
1794                                                 {
1795                                                         MSG_WriteString(&net_message, var->name);
1796                                                         MSG_WriteString(&net_message, var->string);
1797                                                 }
1798                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1799                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1800                                                 SZ_Clear(&net_message);
1801                                         }
1802                                         break;
1803 #endif
1804                                 default:
1805                                         break;
1806                                 }
1807                                 // we may not have liked the packet, but it was a valid control
1808                                 // packet, so we're done processing this packet now
1809                                 return true;
1810                         }
1811                 }
1812 #endif
1813                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1814                 {
1815                         if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1816                         {
1817                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1818                                         SV_ReadClientMessage();
1819                                 return ret;
1820                         }
1821                 }
1822         }
1823         return 0;
1824 }
1825
1826 void NetConn_ServerFrame(void)
1827 {
1828         int i, length;
1829         lhnetaddress_t peeraddress;
1830         netconn_t *conn;
1831         NetConn_UpdateSockets();
1832         for (i = 0;i < sv_numsockets;i++)
1833                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1834                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1835         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1836         {
1837                 // never timeout loopback connections
1838                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
1839                 {
1840                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1841                         SV_DropClient(false);
1842                 }
1843         }
1844         for (conn = netconn_list;conn;conn = conn->next)
1845                 NetConn_ReSendMessage(conn);
1846 }
1847
1848 void NetConn_QueryMasters(void)
1849 {
1850         int i;
1851         int masternum;
1852         lhnetaddress_t masteraddress;
1853         lhnetaddress_t broadcastaddress;
1854         char request[256];
1855
1856         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
1857                 return;
1858
1859         // 26000 is the default quake server port, servers on other ports will not
1860         // be found
1861         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
1862         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
1863
1864         for (i = 0;i < cl_numsockets;i++)
1865         {
1866                 if (cl_sockets[i])
1867                 {
1868                         // search LAN for Quake servers
1869                         SZ_Clear(&net_message);
1870                         // save space for the header, filled in later
1871                         MSG_WriteLong(&net_message, 0);
1872                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1873                         MSG_WriteString(&net_message, "QUAKE");
1874                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1875                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1876                         NetConn_Write(cl_sockets[i], net_message.data, net_message.cursize, &broadcastaddress);
1877                         SZ_Clear(&net_message);
1878
1879                         // search LAN for DarkPlaces servers
1880                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377getinfo", &broadcastaddress);
1881
1882                         // build the getservers message to send to the master servers
1883                         dpsnprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1884
1885                         // search internet
1886                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1887                         {
1888                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1889                                 {
1890                                         masterquerycount++;
1891                                         NetConn_WriteString(cl_sockets[i], request, &masteraddress);
1892                                 }
1893                         }
1894                 }
1895         }
1896         if (!masterquerycount)
1897         {
1898                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
1899                 M_Update_Return_Reason("No network");
1900         }
1901 }
1902
1903 void NetConn_Heartbeat(int priority)
1904 {
1905         lhnetaddress_t masteraddress;
1906         int masternum;
1907         lhnetsocket_t *mysocket;
1908
1909         // if it's a state change (client connected), limit next heartbeat to no
1910         // more than 30 sec in the future
1911         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1912                 nextheartbeattime = realtime + 30.0;
1913
1914         // limit heartbeatperiod to 30 to 270 second range,
1915         // lower limit is to avoid abusing master servers with excess traffic,
1916         // upper limit is to avoid timing out on the master server (which uses
1917         // 300 sec timeout)
1918         if (sv_heartbeatperiod.value < 30)
1919                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1920         if (sv_heartbeatperiod.value > 270)
1921                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1922
1923         // make advertising optional and don't advertise singleplayer games, and
1924         // only send a heartbeat as often as the admin wants
1925         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1926         {
1927                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1928                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1929                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1930                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
1931         }
1932 }
1933
1934 static void Net_Heartbeat_f(void)
1935 {
1936         if (sv.active)
1937                 NetConn_Heartbeat(2);
1938         else
1939                 Con_Print("No server running, can not heartbeat to master server.\n");
1940 }
1941
1942 void PrintStats(netconn_t *conn)
1943 {
1944         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1945 }
1946
1947 void Net_Stats_f(void)
1948 {
1949         netconn_t *conn;
1950         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1951         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1952         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1953         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1954         Con_Printf("packetsSent                = %i\n", packetsSent);
1955         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1956         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1957         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1958         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1959         Con_Print("connections                =\n");
1960         for (conn = netconn_list;conn;conn = conn->next)
1961                 PrintStats(conn);
1962 }
1963
1964 void Net_Slist_f(void)
1965 {
1966         ServerList_ResetMasks();
1967         serverlist_sortbyfield = SLIF_PING;
1968         serverlist_sortdescending = false;
1969     if (m_state != m_slist) {
1970                 Con_Print("Sending requests to master servers\n");
1971                 ServerList_QueryList();
1972                 serverlist_consoleoutput = true;
1973                 Con_Print("Listening for replies...\n");
1974         } else
1975                 ServerList_QueryList();
1976 }
1977
1978 void NetConn_Init(void)
1979 {
1980         int i;
1981         lhnetaddress_t tempaddress;
1982         netconn_mempool = Mem_AllocPool("network connections", 0, NULL);
1983         Cmd_AddCommand("net_stats", Net_Stats_f, "print network statistics");
1984         Cmd_AddCommand("net_slist", Net_Slist_f, "query master series and print all server information");
1985         Cmd_AddCommand("heartbeat", Net_Heartbeat_f, "send a heartbeat to the master server (updates your server information)");
1986         Cvar_RegisterVariable(&net_slist_queriespersecond);
1987         Cvar_RegisterVariable(&net_slist_queriesperframe);
1988         Cvar_RegisterVariable(&net_slist_timeout);
1989         Cvar_RegisterVariable(&net_slist_maxtries);
1990         Cvar_RegisterVariable(&net_messagetimeout);
1991         Cvar_RegisterVariable(&net_messagerejointimeout);
1992         Cvar_RegisterVariable(&net_connecttimeout);
1993         Cvar_RegisterVariable(&cl_netlocalping);
1994         Cvar_RegisterVariable(&cl_netpacketloss);
1995         Cvar_RegisterVariable(&hostname);
1996         Cvar_RegisterVariable(&developer_networking);
1997         Cvar_RegisterVariable(&cl_netport);
1998         Cvar_RegisterVariable(&sv_netport);
1999         Cvar_RegisterVariable(&net_address);
2000         //Cvar_RegisterVariable(&net_address_ipv6);
2001         Cvar_RegisterVariable(&sv_public);
2002         Cvar_RegisterVariable(&sv_heartbeatperiod);
2003         for (i = 0;sv_masters[i].name;i++)
2004                 Cvar_RegisterVariable(&sv_masters[i]);
2005 // 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.
2006         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
2007         {
2008                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
2009                 {
2010                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
2011                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
2012                 }
2013                 else
2014                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
2015         }
2016 // 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
2017         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
2018         {
2019                 i = atoi(com_argv[i + 1]);
2020                 if (i >= 0 && i < 65536)
2021                 {
2022                         Con_Printf("-port option used, setting port cvar to %i\n", i);
2023                         Cvar_SetValueQuick(&sv_netport, i);
2024                 }
2025                 else
2026                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
2027         }
2028         cl_numsockets = 0;
2029         sv_numsockets = 0;
2030         net_message.data = net_message_buf;
2031         net_message.maxsize = sizeof(net_message_buf);
2032         net_message.cursize = 0;
2033         LHNET_Init();
2034 }
2035
2036 void NetConn_Shutdown(void)
2037 {
2038         NetConn_CloseClientPorts();
2039         NetConn_CloseServerPorts();
2040         LHNET_Shutdown();
2041 }
2042