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 QWMASTER_PORT 27000
  27 #define DPMASTER_PORT 27950
  28
  29 // note this defaults on for dedicated servers, off for listen servers
  30 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)"};
  31 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "120", "how often to send heartbeat in seconds (only used if sv_public is 1)"};
  32
  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 cvar_t sv_qwmasters [] =
  47 {
  48         {CVAR_SAVE, "sv_qwmaster1", "", "user-chosen qwmaster server 1"},
  49         {CVAR_SAVE, "sv_qwmaster2", "", "user-chosen qwmaster server 2"},
  50         {CVAR_SAVE, "sv_qwmaster3", "", "user-chosen qwmaster server 3"},
  51         {CVAR_SAVE, "sv_qwmaster4", "", "user-chosen qwmaster server 4"},
  52         {0, "sv_qwmasterextra1", "192.246.40.37:27000", "id Limbo (admin: id Software)"},
  53         {0, "sv_qwmasterextra2", "192.246.40.37:27002", "id CTF (admin: id Software)"},
  54         {0, "sv_qwmasterextra3", "192.246.40.37:27003", "id TeamFortress (admin: id Software)"},
  55         {0, "sv_qwmasterextra4", "192.246.40.37:27004", "id Miscilaneous (admin: id Software)"},
  56         {0, "sv_qwmasterextra5", "192.246.40.37:27006", "id Deathmatch Only (admin: id Software)"},
  57         {0, "sv_qwmasterextra6", "150.254.66.120:27000", "Poland's master server. (admin: unknown)"},
  58         {0, "sv_qwmasterextra7", "62.112.145.129:27000", "Ocrana master server. (admin: unknown)"},
  59         {0, "sv_qwmasterextra8", "master.edome.net", "edome master server. (admin: unknown)"},
  60         {0, "sv_qwmasterextra9", "qwmaster.barrysworld.com", "barrysworld master server. (admin: unknown)"},
  61         {0, "sv_qwmasterextra10", "qwmaster.ocrana.de:27000", "Ocrana2 master server. (admin: unknown)"},
  62         {0, "sv_qwmasterextra11", "213.221.174.165:27000", "unknown1 master server. (admin: unknown)"},
  63         {0, "sv_qwmasterextra12", "195.74.0.8", "unknown2 master server. (admin: unknown)"},
  64         {0, "sv_qwmasterextra13", "204.182.161.2", "unknown3 master server. (admin: unknown)"},
  65         {0, NULL, NULL, NULL}
  66 };
  67
  68 static double nextheartbeattime = 0;
  69
  70 sizebuf_t net_message;
  71 static unsigned char net_message_buf[NET_MAXMESSAGE];
  72
  73 cvar_t net_messagetimeout = {0, "net_messagetimeout","300", "drops players who have not sent any packets for this many seconds"};
  74 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)"};
  75 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)"};
  76 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED", "server message to show in server browser"};
  77 cvar_t developer_networking = {0, "developer_networking", "0", "prints all received and sent packets (recommended only for debugging)"};
  78
  79 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)"};
  80 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)"};
  81 static cvar_t net_slist_queriespersecond = {0, "net_slist_queriespersecond", "20", "how many server information requests to send per second"};
  82 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)"};
  83 static cvar_t net_slist_timeout = {0, "net_slist_timeout", "4", "how long to listen for a server information response before giving up"};
  84 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)"};
  85
  86 static cvar_t gameversion = {0, "gameversion", "0", "version of game data (mod-specific), when client and server gameversion mismatch in the server browser the server is shown as incompatible"};
  87
  88 /* statistic counters */
  89 static int packetsSent = 0;
  90 static int packetsReSent = 0;
  91 static int packetsReceived = 0;
  92 static int receivedDuplicateCount = 0;
  93 static int droppedDatagrams = 0;
  94
  95 static int unreliableMessagesSent = 0;
  96 static int unreliableMessagesReceived = 0;
  97 static int reliableMessagesSent = 0;
  98 static int reliableMessagesReceived = 0;
  99
 100 double masterquerytime = -1000;
 101 int masterquerycount = 0;
 102 int masterreplycount = 0;
 103 int serverquerycount = 0;
 104 int serverreplycount = 0;
 105
 106 // this is only false if there are still servers left to query
 107 static qboolean serverlist_querysleep = true;
 108 // this is pushed a second or two ahead of realtime whenever a master server
 109 // reply is received, to avoid issuing queries while master replies are still
 110 // flooding in (which would make a mess of the ping times)
 111 static double serverlist_querywaittime = 0;
 112
 113 static unsigned char sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
 114 static unsigned char readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
 115
 116 static int cl_numsockets;
 117 static lhnetsocket_t *cl_sockets[16];
 118 static int sv_numsockets;
 119 static lhnetsocket_t *sv_sockets[16];
 120
 121 netconn_t *netconn_list = NULL;
 122 mempool_t *netconn_mempool = NULL;
 123
 124 cvar_t cl_netport = {0, "cl_port", "0", "forces client to use chosen port number if not 0"};
 125 cvar_t sv_netport = {0, "port", "26000", "server port for players to connect to"};
 126 cvar_t net_address = {0, "net_address", "0.0.0.0", "network address to open ports on"};
 127 //cvar_t net_netaddress_ipv6 = {0, "net_address_ipv6", "[0:0:0:0:0:0:0:0]", "network address to open ipv6 ports on"};
 128
 129 // ServerList interface
 130 serverlist_mask_t serverlist_andmasks[SERVERLIST_ANDMASKCOUNT];
 131 serverlist_mask_t serverlist_ormasks[SERVERLIST_ORMASKCOUNT];
 132
 133 serverlist_infofield_t serverlist_sortbyfield;
 134 qboolean serverlist_sortdescending;
 135
 136 int serverlist_viewcount = 0;
 137 serverlist_entry_t *serverlist_viewlist[SERVERLIST_VIEWLISTSIZE];
 138
 139 int serverlist_cachecount;
 140 serverlist_entry_t serverlist_cache[SERVERLIST_TOTALSIZE];
 141
 142 qboolean serverlist_consoleoutput;
 143
 144 // helper function to insert a value into the viewset
 145 // spare entries will be removed
 146 static void _ServerList_ViewList_Helper_InsertBefore( int index, serverlist_entry_t *entry )
 147 {
 148     int i;
 149         if( serverlist_viewcount < SERVERLIST_VIEWLISTSIZE ) {
 150                 i = serverlist_viewcount++;
 151         } else {
 152                 i = SERVERLIST_VIEWLISTSIZE - 1;
 153         }
 154
 155         for( ; i > index ; i-- )
 156                 serverlist_viewlist[ i ] = serverlist_viewlist[ i - 1 ];
 157
 158         serverlist_viewlist[index] = entry;
 159 }
 160
 161 // we suppose serverlist_viewcount to be valid, ie > 0
 162 static void _ServerList_ViewList_Helper_Remove( int index )
 163 {
 164         serverlist_viewcount--;
 165         for( ; index < serverlist_viewcount ; index++ )
 166                 serverlist_viewlist[index] = serverlist_viewlist[index + 1];
 167 }
 168
 169 // returns true if A should be inserted before B
 170 static qboolean _ServerList_Entry_Compare( serverlist_entry_t *A, serverlist_entry_t *B )
 171 {
 172         int result = 0; // > 0 if for numbers A > B and for text if A < B
 173
 174         switch( serverlist_sortbyfield ) {
 175                 case SLIF_PING:
 176                         result = A->info.ping - B->info.ping;
 177                         break;
 178                 case SLIF_MAXPLAYERS:
 179                         result = A->info.maxplayers - B->info.maxplayers;
 180                         break;
 181                 case SLIF_NUMPLAYERS:
 182                         result = A->info.numplayers - B->info.numplayers;
 183                         break;
 184                 case SLIF_PROTOCOL:
 185                         result = A->info.protocol - B->info.protocol;
 186                         break;
 187                 case SLIF_CNAME:
 188                         result = strcmp( B->info.cname, A->info.cname );
 189                         break;
 190                 case SLIF_GAME:
 191                         result = strcmp( B->info.game, A->info.game );
 192                         break;
 193                 case SLIF_MAP:
 194                         result = strcmp( B->info.map, A->info.map );
 195                         break;
 196                 case SLIF_MOD:
 197                         result = strcmp( B->info.mod, A->info.mod );
 198                         break;
 199                 case SLIF_NAME:
 200                         result = strcmp( B->info.name, A->info.name );
 201                         break;
 202                 default:
 203                         Con_DPrint( "_ServerList_Entry_Compare: Bad serverlist_sortbyfield!\n" );
 204                         break;
 205         }
 206
 207         if( serverlist_sortdescending )
 208                 return result > 0;
 209         return result < 0;
 210 }
 211
 212 static qboolean _ServerList_CompareInt( int A, serverlist_maskop_t op, int B )
 213 {
 214         // This should actually be done with some intermediate and end-of-function return
 215         switch( op ) {
 216                 case SLMO_LESS:
 217                         return A < B;
 218                 case SLMO_LESSEQUAL:
 219                         return A <= B;
 220                 case SLMO_EQUAL:
 221                         return A == B;
 222                 case SLMO_GREATER:
 223                         return A > B;
 224                 case SLMO_NOTEQUAL:
 225                         return A != B;
 226                 case SLMO_GREATEREQUAL:
 227                 case SLMO_CONTAINS:
 228                 case SLMO_NOTCONTAIN:
 229                         return A >= B;
 230                 default:
 231                         Con_DPrint( "_ServerList_CompareInt: Bad op!\n" );
 232                         return false;
 233         }
 234 }
 235
 236 static qboolean _ServerList_CompareStr( const char *A, serverlist_maskop_t op, const char *B )
 237 {
 238         int i;
 239         char bufferA[ 256 ], bufferB[ 256 ]; // should be more than enough
 240         for (i = 0;i < (int)sizeof(bufferA)-1 && A[i];i++)
 241                 bufferA[i] = (A[i] >= 'A' && A[i] <= 'Z') ? (A[i] + 'a' - 'A') : A[i];
 242         bufferA[i] = 0;
 243         for (i = 0;i < (int)sizeof(bufferB)-1 && B[i];i++)
 244                 bufferB[i] = (B[i] >= 'A' && B[i] <= 'Z') ? (B[i] + 'a' - 'A') : B[i];
 245         bufferB[i] = 0;
 246
 247         // Same here, also using an intermediate & final return would be more appropriate
 248         // A info B mask
 249         switch( op ) {
 250                 case SLMO_CONTAINS:
 251                         return *bufferB && !!strstr( bufferA, bufferB ); // we want a real bool
 252                 case SLMO_NOTCONTAIN:
 253                         return !*bufferB || !strstr( bufferA, bufferB );
 254                 case SLMO_LESS:
 255                         return strcmp( bufferA, bufferB ) < 0;
 256                 case SLMO_LESSEQUAL:
 257                         return strcmp( bufferA, bufferB ) <= 0;
 258                 case SLMO_EQUAL:
 259                         return strcmp( bufferA, bufferB ) == 0;
 260                 case SLMO_GREATER:
 261                         return strcmp( bufferA, bufferB ) > 0;
 262                 case SLMO_NOTEQUAL:
 263                         return strcmp( bufferA, bufferB ) != 0;
 264                 case SLMO_GREATEREQUAL:
 265                         return strcmp( bufferA, bufferB ) >= 0;
 266                 default:
 267                         Con_DPrint( "_ServerList_CompareStr: Bad op!\n" );
 268                         return false;
 269         }
 270 }
 271
 272 static qboolean _ServerList_Entry_Mask( serverlist_mask_t *mask, serverlist_info_t *info )
 273 {
 274         if( !_ServerList_CompareInt( info->ping, mask->tests[SLIF_PING], mask->info.ping ) )
 275                 return false;
 276         if( !_ServerList_CompareInt( info->maxplayers, mask->tests[SLIF_MAXPLAYERS], mask->info.maxplayers ) )
 277                 return false;
 278         if( !_ServerList_CompareInt( info->numplayers, mask->tests[SLIF_NUMPLAYERS], mask->info.numplayers ) )
 279                 return false;
 280         if( !_ServerList_CompareInt( info->protocol, mask->tests[SLIF_PROTOCOL], mask->info.protocol ))
 281                 return false;
 282         if( *mask->info.cname
 283                 && !_ServerList_CompareStr( info->cname, mask->tests[SLIF_CNAME], mask->info.cname ) )
 284                 return false;
 285         if( *mask->info.game
 286                 && !_ServerList_CompareStr( info->game, mask->tests[SLIF_GAME], mask->info.game ) )
 287                 return false;
 288         if( *mask->info.mod
 289                 && !_ServerList_CompareStr( info->mod, mask->tests[SLIF_MOD], mask->info.mod ) )
 290                 return false;
 291         if( *mask->info.map
 292                 && !_ServerList_CompareStr( info->map, mask->tests[SLIF_MAP], mask->info.map ) )
 293                 return false;
 294         if( *mask->info.name
 295                 && !_ServerList_CompareStr( info->name, mask->tests[SLIF_NAME], mask->info.name ) )
 296                 return false;
 297         return true;
 298 }
 299
 300 static void ServerList_ViewList_Insert( serverlist_entry_t *entry )
 301 {
 302         int start, end, mid;
 303
 304         // reject incompatible servers
 305         if (entry->info.gameversion != gameversion.integer)
 306                 return;
 307
 308         // FIXME: change this to be more readable (...)
 309         // now check whether it passes through the masks
 310         for( start = 0 ; serverlist_andmasks[start].active && start < SERVERLIST_ANDMASKCOUNT ; start++ )
 311                 if( !_ServerList_Entry_Mask( &serverlist_andmasks[start], &entry->info ) )
 312                         return;
 313
 314         for( start = 0 ; serverlist_ormasks[start].active && start < SERVERLIST_ORMASKCOUNT ; start++ )
 315                 if( _ServerList_Entry_Mask( &serverlist_ormasks[start], &entry->info ) )
 316                         break;
 317         if( start == SERVERLIST_ORMASKCOUNT || (start > 0 && !serverlist_ormasks[start].active) )
 318                 return;
 319
 320         if( !serverlist_viewcount ) {
 321                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 322                 return;
 323         }
 324         // ok, insert it, we just need to find out where exactly:
 325
 326         // two special cases
 327         // check whether to insert it as new first item
 328         if( _ServerList_Entry_Compare( entry, serverlist_viewlist[0] ) ) {
 329                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 330                 return;
 331         } // check whether to insert it as new last item
 332         else if( !_ServerList_Entry_Compare( entry, serverlist_viewlist[serverlist_viewcount - 1] ) ) {
 333                 _ServerList_ViewList_Helper_InsertBefore( serverlist_viewcount, entry );
 334                 return;
 335         }
 336         start = 0;
 337         end = serverlist_viewcount - 1;
 338         while( end > start + 1 )
 339         {
 340                 mid = (start + end) / 2;
 341                 // test the item that lies in the middle between start and end
 342                 if( _ServerList_Entry_Compare( entry, serverlist_viewlist[mid] ) )
 343                         // the item has to be in the upper half
 344                         end = mid;
 345                 else
 346                         // the item has to be in the lower half
 347                         start = mid;
 348         }
 349         _ServerList_ViewList_Helper_InsertBefore( start + 1, entry );
 350 }
 351
 352 static void ServerList_ViewList_Remove( serverlist_entry_t *entry )
 353 {
 354         int i;
 355         for( i = 0; i < serverlist_viewcount; i++ )
 356         {
 357                 if (serverlist_viewlist[i] == entry)
 358                 {
 359                         _ServerList_ViewList_Helper_Remove(i);
 360                         break;
 361                 }
 362         }
 363 }
 364
 365 void ServerList_RebuildViewList(void)
 366 {
 367         int i;
 368
 369         serverlist_viewcount = 0;
 370         for( i = 0 ; i < serverlist_cachecount ; i++ )
 371                 if( serverlist_cache[i].query == SQS_QUERIED )
 372                         ServerList_ViewList_Insert( &serverlist_cache[i] );
 373 }
 374
 375 void ServerList_ResetMasks(void)
 376 {
 377         memset( &serverlist_andmasks, 0, sizeof( serverlist_andmasks ) );
 378         memset( &serverlist_ormasks, 0, sizeof( serverlist_ormasks ) );
 379 }
 380
 381 #if 0
 382 static void _ServerList_Test(void)
 383 {
 384         int i;
 385         for( i = 0 ; i < 1024 ; i++ ) {
 386                 memset( &serverlist_cache[serverlist_cachecount], 0, sizeof( serverlist_entry_t ) );
 387                 serverlist_cache[serverlist_cachecount].info.ping = 1000 + 1024 - i;
 388                 dpsnprintf( serverlist_cache[serverlist_cachecount].info.name, sizeof(serverlist_cache[serverlist_cachecount].info.name), "Black's ServerList Test %i", i );
 389                 serverlist_cache[serverlist_cachecount].finished = true;
 390                 sprintf( serverlist_cache[serverlist_cachecount].line1, "%i %s", serverlist_cache[serverlist_cachecount].info.ping, serverlist_cache[serverlist_cachecount].info.name );
 391                 ServerList_ViewList_Insert( &serverlist_cache[serverlist_cachecount] );
 392                 serverlist_cachecount++;
 393         }
 394 }
 395 #endif
 396
 397 void ServerList_QueryList(qboolean querydp, qboolean queryqw)
 398 {
 399         //masterquerytime = realtime;
 400         masterquerytime = Sys_DoubleTime();
 401         masterquerycount = 0;
 402         masterreplycount = 0;
 403         serverquerycount = 0;
 404         serverreplycount = 0;
 405         serverlist_cachecount = 0;
 406         serverlist_viewcount = 0;
 407         serverlist_consoleoutput = false;
 408
 409         //_ServerList_Test();
 410
 411         NetConn_QueryMasters(querydp, queryqw);
 412 }
 413
 414 // rest
 415
 416 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
 417 {
 418         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
 419         int i;
 420         if (length == 0)
 421                 return 0;
 422         if (cl_netpacketloss.integer)
 423                 for (i = 0;i < cl_numsockets;i++)
 424                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 425                                 return 0;
 426         if (developer_networking.integer)
 427         {
 428                 char addressstring[128], addressstring2[128];
 429                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 430                 if (length > 0)
 431                 {
 432                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 433                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
 434                         Com_HexDumpToConsole((unsigned char *)data, length);
 435                 }
 436                 else
 437                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
 438         }
 439         return length;
 440 }
 441
 442 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 443 {
 444         int ret;
 445         int i;
 446         if (cl_netpacketloss.integer)
 447                 for (i = 0;i < cl_numsockets;i++)
 448                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 449                                 return length;
 450         ret = LHNET_Write(mysocket, data, length, peeraddress);
 451         if (developer_networking.integer)
 452         {
 453                 char addressstring[128], addressstring2[128];
 454                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 455                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 456                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 457                 Com_HexDumpToConsole((unsigned char *)data, length);
 458         }
 459         return ret;
 460 }
 461
 462 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 463 {
 464         // note this does not include the trailing NULL because we add that in the parser
 465         return NetConn_Write(mysocket, string, (int)strlen(string), peeraddress);
 466 }
 467
 468 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data, protocolversion_t protocol)
 469 {
 470         if (protocol == PROTOCOL_QUAKEWORLD)
 471         {
 472                 int packetLen;
 473                 qboolean sendreliable;
 474
 475                 // note that it is ok to send empty messages to the qw server,
 476                 // otherwise it won't respond to us at all
 477
 478                 sendreliable = false;
 479                 // if the remote side dropped the last reliable message, resend it
 480                 if (conn->qw.incoming_acknowledged > conn->qw.last_reliable_sequence && conn->qw.incoming_reliable_acknowledged != conn->qw.reliable_sequence)
 481                         sendreliable = true;
 482                 // if the reliable transmit buffer is empty, copy the current message out
 483                 if (!conn->sendMessageLength && conn->message.cursize)
 484                 {
 485                         memcpy (conn->sendMessage, conn->message.data, conn->message.cursize);
 486                         conn->sendMessageLength = conn->message.cursize;
 487                         SZ_Clear(&conn->message); // clear the message buffer
 488                         conn->qw.reliable_sequence ^= 1;
 489                         sendreliable = true;
 490                 }
 491                 // outgoing unreliable packet number, and outgoing reliable packet number (0 or 1)
 492                 *((int *)(sendbuffer + 0)) = LittleLong((unsigned int)conn->qw.outgoing_sequence | ((unsigned int)sendreliable<<31));
 493                 // last received unreliable packet number, and last received reliable packet number (0 or 1)
 494                 *((int *)(sendbuffer + 4)) = LittleLong((unsigned int)conn->qw.incoming_sequence | ((unsigned int)conn->qw.incoming_reliable_sequence<<31));
 495                 packetLen = 8;
 496                 conn->qw.outgoing_sequence++;
 497                 // client sends qport in every packet
 498                 if (conn == cls.netcon)
 499                 {
 500                         *((short *)(sendbuffer + 8)) = LittleShort(cls.qw_qport);
 501                         packetLen += 2;
 502                 }
 503                 if (packetLen + (sendreliable ? conn->sendMessageLength : 0) > 1400)
 504                 {
 505                         Con_Printf ("NetConn_SendUnreliableMessage: reliable message too big %u\n", data->cursize);
 506                         return -1;
 507                 }
 508                 // add the reliable message if there is one
 509                 if (sendreliable)
 510                 {
 511                         memcpy(sendbuffer + packetLen, conn->sendMessage, conn->sendMessageLength);
 512                         packetLen += conn->sendMessageLength;
 513                         conn->qw.last_reliable_sequence = conn->qw.outgoing_sequence;
 514                 }
 515                 // add the unreliable message if possible
 516                 if (packetLen + data->cursize <= 1400)
 517                 {
 518                         memcpy(sendbuffer + packetLen, data->data, data->cursize);
 519                         packetLen += data->cursize;
 520                 }
 521
 522                 NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
 523
 524                 packetsSent++;
 525                 unreliableMessagesSent++;
 526
 527                 // delay later packets to obey rate limit
 528                 conn->qw.cleartime = max(conn->qw.cleartime, realtime) + packetLen * conn->qw.rate;
 529
 530                 return 0;
 531         }
 532         else
 533         {
 534                 unsigned int packetLen;
 535                 unsigned int dataLen;
 536                 unsigned int eom;
 537                 unsigned int *header;
 538
 539                 // if a reliable message fragment has been lost, send it again
 540                 if (conn->sendMessageLength && (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->nq.sendSequence - 1);
 558                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 559
 560                         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) == (int)packetLen)
 561                         {
 562                                 conn->lastSendTime = realtime;
 563                                 packetsReSent++;
 564                         }
 565                 }
 566
 567                 // if we have a new reliable message to send, do so
 568                 if (!conn->sendMessageLength && conn->message.cursize)
 569                 {
 570                         if (conn->message.cursize > (int)sizeof(conn->sendMessage))
 571                         {
 572                                 Con_Printf("NetConn_SendUnreliableMessage: reliable message too big (%u > %u)\n", conn->message.cursize, sizeof(conn->sendMessage));
 573                                 conn->message.overflowed = true;
 574                                 return -1;
 575                         }
 576
 577                         if (developer_networking.integer && conn == cls.netcon)
 578                         {
 579                                 Con_Print("client sending reliable message to server:\n");
 580                                 SZ_HexDumpToConsole(&conn->message);
 581                         }
 582
 583                         memcpy(conn->sendMessage, conn->message.data, conn->message.cursize);
 584                         conn->sendMessageLength = conn->message.cursize;
 585                         SZ_Clear(&conn->message);
 586
 587                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 588                         {
 589                                 dataLen = conn->sendMessageLength;
 590                                 eom = NETFLAG_EOM;
 591                         }
 592                         else
 593                         {
 594                                 dataLen = MAX_PACKETFRAGMENT;
 595                                 eom = 0;
 596                         }
 597
 598                         packetLen = NET_HEADERSIZE + dataLen;
 599
 600                         header = (unsigned int *)sendbuffer;
 601                         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 602                         header[1] = BigLong(conn->nq.sendSequence);
 603                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 604
 605                         conn->nq.sendSequence++;
 606
 607                         NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
 608
 609                         conn->lastSendTime = realtime;
 610                         packetsSent++;
 611                         reliableMessagesSent++;
 612                 }
 613
 614                 // if we have an unreliable message to send, do so
 615                 if (data->cursize)
 616                 {
 617                         packetLen = NET_HEADERSIZE + data->cursize;
 618
 619                         if (packetLen > (int)sizeof(sendbuffer))
 620                         {
 621                                 Con_Printf("NetConn_SendUnreliableMessage: message too big %u\n", data->cursize);
 622                                 return -1;
 623                         }
 624
 625                         header = (unsigned int *)sendbuffer;
 626                         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
 627                         header[1] = BigLong(conn->nq.unreliableSendSequence);
 628                         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
 629
 630                         conn->nq.unreliableSendSequence++;
 631
 632                         NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
 633
 634                         packetsSent++;
 635                         unreliableMessagesSent++;
 636                 }
 637                 return 0;
 638         }
 639 }
 640
 641 void NetConn_CloseClientPorts(void)
 642 {
 643         for (;cl_numsockets > 0;cl_numsockets--)
 644                 if (cl_sockets[cl_numsockets - 1])
 645                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 646 }
 647
 648 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
 649 {
 650         lhnetaddress_t address;
 651         lhnetsocket_t *s;
 652         char addressstring2[1024];
 653         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 654         {
 655                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 656                 {
 657                         cl_sockets[cl_numsockets++] = s;
 658                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 659                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
 660                 }
 661                 else
 662                 {
 663                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 664                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
 665                 }
 666         }
 667         else
 668                 Con_Printf("Client unable to parse address %s\n", addressstring);
 669 }
 670
 671 void NetConn_OpenClientPorts(void)
 672 {
 673         int port;
 674         NetConn_CloseClientPorts();
 675         port = bound(0, cl_netport.integer, 65535);
 676         if (cl_netport.integer != port)
 677                 Cvar_SetValueQuick(&cl_netport, port);
 678         Con_Printf("Client using port %i\n", port);
 679         NetConn_OpenClientPort("local:2", 0);
 680         NetConn_OpenClientPort(net_address.string, port);
 681         //NetConn_OpenClientPort(net_address_ipv6.string, port);
 682 }
 683
 684 void NetConn_CloseServerPorts(void)
 685 {
 686         for (;sv_numsockets > 0;sv_numsockets--)
 687                 if (sv_sockets[sv_numsockets - 1])
 688                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 689 }
 690
 691 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
 692 {
 693         lhnetaddress_t address;
 694         lhnetsocket_t *s;
 695         int port;
 696         char addressstring2[1024];
 697
 698         for (port = defaultport; port <= defaultport + 100; port++)
 699         {
 700                 if (LHNETADDRESS_FromString(&address, addressstring, port))
 701                 {
 702                         if ((s = LHNET_OpenSocket_Connectionless(&address)))
 703                         {
 704                                 sv_sockets[sv_numsockets++] = s;
 705                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 706                                 Con_Printf("Server listening on address %s\n", addressstring2);
 707                                 break;
 708                         }
 709                         else
 710                         {
 711                                 LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 712                                 Con_Printf("Server failed to open socket on address %s\n", addressstring2);
 713                         }
 714                 }
 715                 else
 716                 {
 717                         Con_Printf("Server unable to parse address %s\n", addressstring);
 718                         // if it cant parse one address, it wont be able to parse another for sure
 719                         break;
 720                 }
 721         }
 722 }
 723
 724 void NetConn_OpenServerPorts(int opennetports)
 725 {
 726         int port;
 727         NetConn_CloseServerPorts();
 728         NetConn_UpdateSockets();
 729         port = bound(0, sv_netport.integer, 65535);
 730         if (port == 0)
 731                 port = 26000;
 732         Con_Printf("Server using port %i\n", port);
 733         if (sv_netport.integer != port)
 734                 Cvar_SetValueQuick(&sv_netport, port);
 735         if (cls.state != ca_dedicated)
 736                 NetConn_OpenServerPort("local:1", 0);
 737         if (opennetports)
 738         {
 739                 NetConn_OpenServerPort(net_address.string, port);
 740                 //NetConn_OpenServerPort(net_address_ipv6.string, port);
 741         }
 742         if (sv_numsockets == 0)
 743                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!");
 744 }
 745
 746 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 747 {
 748         int i, a = LHNETADDRESS_GetAddressType(address);
 749         for (i = 0;i < cl_numsockets;i++)
 750                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 751                         return cl_sockets[i];
 752         return NULL;
 753 }
 754
 755 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 756 {
 757         int i, a = LHNETADDRESS_GetAddressType(address);
 758         for (i = 0;i < sv_numsockets;i++)
 759                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 760                         return sv_sockets[i];
 761         return NULL;
 762 }
 763
 764 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 765 {
 766         netconn_t *conn;
 767         conn = (netconn_t *)Mem_Alloc(netconn_mempool, sizeof(*conn));
 768         conn->mysocket = mysocket;
 769         conn->peeraddress = *peeraddress;
 770         conn->lastMessageTime = realtime;
 771         conn->message.data = conn->messagedata;
 772         conn->message.maxsize = sizeof(conn->messagedata);
 773         conn->message.cursize = 0;
 774         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
 775         // reduce effectiveness of connection request floods
 776         conn->timeout = realtime + net_connecttimeout.value;
 777         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
 778         conn->next = netconn_list;
 779         netconn_list = conn;
 780         return conn;
 781 }
 782
 783 void NetConn_Close(netconn_t *conn)
 784 {
 785         netconn_t *c;
 786         // remove connection from list
 787         if (conn == netconn_list)
 788                 netconn_list = conn->next;
 789         else
 790         {
 791                 for (c = netconn_list;c;c = c->next)
 792                 {
 793                         if (c->next == conn)
 794                         {
 795                                 c->next = conn->next;
 796                                 break;
 797                         }
 798                 }
 799                 // not found in list, we'll avoid crashing here...
 800                 if (!c)
 801                         return;
 802         }
 803         // free connection
 804         Mem_Free(conn);
 805 }
 806
 807 static int clientport = -1;
 808 static int clientport2 = -1;
 809 static int hostport = -1;
 810 void NetConn_UpdateSockets(void)
 811 {
 812         if (cls.state != ca_dedicated)
 813         {
 814                 if (clientport2 != cl_netport.integer)
 815                 {
 816                         clientport2 = cl_netport.integer;
 817                         if (cls.state == ca_connected)
 818                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
 819                 }
 820                 if (cls.state == ca_disconnected && clientport != clientport2)
 821                 {
 822                         clientport = clientport2;
 823                         NetConn_CloseClientPorts();
 824                 }
 825                 if (cl_numsockets == 0)
 826                         NetConn_OpenClientPorts();
 827         }
 828
 829         if (hostport != sv_netport.integer)
 830         {
 831                 hostport = sv_netport.integer;
 832                 if (sv.active)
 833                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
 834         }
 835 }
 836
 837 static int NetConn_ReceivedMessage(netconn_t *conn, unsigned char *data, int length, protocolversion_t protocol)
 838 {
 839         if (length < 8)
 840                 return 0;
 841
 842         if (protocol == PROTOCOL_QUAKEWORLD)
 843         {
 844                 int sequence, sequence_ack;
 845                 int reliable_ack, reliable_message;
 846                 int count;
 847                 int qport;
 848
 849                 sequence = LittleLong(*((int *)(data + 0)));
 850                 sequence_ack = LittleLong(*((int *)(data + 4)));
 851                 data += 8;
 852                 length -= 8;
 853
 854                 if (conn != cls.netcon)
 855                 {
 856                         // server only
 857                         if (length < 2)
 858                                 return 0;
 859                         // TODO: use qport to identify that this client really is who they say they are?  (and elsewhere in the code to identify the connection without a port match?)
 860                         qport = LittleShort(*((int *)(data + 8)));
 861                         data += 2;
 862                         length -= 2;
 863                 }
 864
 865                 packetsReceived++;
 866                 reliable_message = (sequence >> 31) & 1;
 867                 reliable_ack = (sequence_ack >> 31) & 1;
 868                 sequence &= ~(1<<31);
 869                 sequence_ack &= ~(1<<31);
 870                 if (sequence <= conn->qw.incoming_sequence)
 871                 {
 872                         Con_DPrint("Got a stale datagram\n");
 873                         return 0;
 874                 }
 875                 count = sequence - (conn->qw.incoming_sequence + 1);
 876                 if (count > 0)
 877                 {
 878                         droppedDatagrams += count;
 879                         Con_DPrintf("Dropped %u datagram(s)\n", count);
 880                 }
 881                 if (reliable_ack == conn->qw.reliable_sequence)
 882                 {
 883                         // received, now we will be able to send another reliable message
 884                         conn->sendMessageLength = 0;
 885                         reliableMessagesReceived++;
 886                 }
 887                 conn->qw.incoming_sequence = sequence;
 888                 conn->qw.incoming_acknowledged = sequence_ack;
 889                 conn->qw.incoming_reliable_acknowledged = reliable_ack;
 890                 if (reliable_message)
 891                         conn->qw.incoming_reliable_sequence ^= 1;
 892                 conn->lastMessageTime = realtime;
 893                 conn->timeout = realtime + net_messagetimeout.value;
 894                 unreliableMessagesReceived++;
 895                 SZ_Clear(&net_message);
 896                 SZ_Write(&net_message, data, length);
 897                 MSG_BeginReading();
 898                 return 2;
 899         }
 900         else
 901         {
 902                 unsigned int count;
 903                 unsigned int flags;
 904                 unsigned int sequence;
 905                 int qlength;
 906
 907                 qlength = (unsigned int)BigLong(((int *)data)[0]);
 908                 flags = qlength & ~NETFLAG_LENGTH_MASK;
 909                 qlength &= NETFLAG_LENGTH_MASK;
 910                 // control packets were already handled
 911                 if (!(flags & NETFLAG_CTL) && qlength == length)
 912                 {
 913                         sequence = BigLong(((int *)data)[1]);
 914                         packetsReceived++;
 915                         data += 8;
 916                         length -= 8;
 917                         if (flags & NETFLAG_UNRELIABLE)
 918                         {
 919                                 if (sequence >= conn->nq.unreliableReceiveSequence)
 920                                 {
 921                                         if (sequence > conn->nq.unreliableReceiveSequence)
 922                                         {
 923                                                 count = sequence - conn->nq.unreliableReceiveSequence;
 924                                                 droppedDatagrams += count;
 925                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
 926                                         }
 927                                         conn->nq.unreliableReceiveSequence = sequence + 1;
 928                                         conn->lastMessageTime = realtime;
 929                                         conn->timeout = realtime + net_messagetimeout.value;
 930                                         unreliableMessagesReceived++;
 931                                         if (length > 0)
 932                                         {
 933                                                 SZ_Clear(&net_message);
 934                                                 SZ_Write(&net_message, data, length);
 935                                                 MSG_BeginReading();
 936                                                 return 2;
 937                                         }
 938                                 }
 939                                 else
 940                                         Con_DPrint("Got a stale datagram\n");
 941                                 return 1;
 942                         }
 943                         else if (flags & NETFLAG_ACK)
 944                         {
 945                                 if (sequence == (conn->nq.sendSequence - 1))
 946                                 {
 947                                         if (sequence == conn->nq.ackSequence)
 948                                         {
 949                                                 conn->nq.ackSequence++;
 950                                                 if (conn->nq.ackSequence != conn->nq.sendSequence)
 951                                                         Con_DPrint("ack sequencing error\n");
 952                                                 conn->lastMessageTime = realtime;
 953                                                 conn->timeout = realtime + net_messagetimeout.value;
 954                                                 if (conn->sendMessageLength > MAX_PACKETFRAGMENT)
 955                                                 {
 956                                                         unsigned int packetLen;
 957                                                         unsigned int dataLen;
 958                                                         unsigned int eom;
 959                                                         unsigned int *header;
 960
 961                                                         conn->sendMessageLength -= MAX_PACKETFRAGMENT;
 962                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
 963
 964                                                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 965                                                         {
 966                                                                 dataLen = conn->sendMessageLength;
 967                                                                 eom = NETFLAG_EOM;
 968                                                         }
 969                                                         else
 970                                                         {
 971                                                                 dataLen = MAX_PACKETFRAGMENT;
 972                                                                 eom = 0;
 973                                                         }
 974
 975                                                         packetLen = NET_HEADERSIZE + dataLen;
 976
 977                                                         header = (unsigned int *)sendbuffer;
 978                                                         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 979                                                         header[1] = BigLong(conn->nq.sendSequence);
 980                                                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 981
 982                                                         conn->nq.sendSequence++;
 983
 984                                                         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) == (int)packetLen)
 985                                                         {
 986                                                                 conn->lastSendTime = realtime;
 987                                                                 packetsSent++;
 988                                                         }
 989                                                 }
 990                                                 else
 991                                                         conn->sendMessageLength = 0;
 992                                         }
 993                                         else
 994                                                 Con_DPrint("Duplicate ACK received\n");
 995                                 }
 996                                 else
 997                                         Con_DPrint("Stale ACK received\n");
 998                                 return 1;
 999                         }
1000                         else if (flags & NETFLAG_DATA)
1001                         {
1002                                 unsigned int temppacket[2];
1003                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
1004                                 temppacket[1] = BigLong(sequence);
1005                                 NetConn_Write(conn->mysocket, (unsigned char *)temppacket, 8, &conn->peeraddress);
1006                                 if (sequence == conn->nq.receiveSequence)
1007                                 {
1008                                         conn->lastMessageTime = realtime;
1009                                         conn->timeout = realtime + net_messagetimeout.value;
1010                                         conn->nq.receiveSequence++;
1011                                         if( conn->receiveMessageLength + length <= (int)sizeof( conn->receiveMessage ) ) {
1012                                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
1013                                                 conn->receiveMessageLength += length;
1014                                         } else {
1015                                                 Con_Printf( "Reliable message (seq: %i) too big for message buffer!\n"
1016                                                                         "Dropping the message!\n", sequence );
1017                                                 conn->receiveMessageLength = 0;
1018                                                 return 1;
1019                                         }
1020                                         if (flags & NETFLAG_EOM)
1021                                         {
1022                                                 reliableMessagesReceived++;
1023                                                 length = conn->receiveMessageLength;
1024                                                 conn->receiveMessageLength = 0;
1025                                                 if (length > 0)
1026                                                 {
1027                                                         SZ_Clear(&net_message);
1028                                                         SZ_Write(&net_message, conn->receiveMessage, length);
1029                                                         MSG_BeginReading();
1030                                                         return 2;
1031                                                 }
1032                                         }
1033                                 }
1034                                 else
1035                                         receivedDuplicateCount++;
1036                                 return 1;
1037                         }
1038                 }
1039         }
1040         return 0;
1041 }
1042
1043 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress, protocolversion_t initialprotocol)
1044 {
1045         cls.connect_trying = false;
1046         M_Update_Return_Reason("");
1047         // the connection request succeeded, stop current connection and set up a new connection
1048         CL_Disconnect();
1049         // if we're connecting to a remote server, shut down any local server
1050         if (LHNETADDRESS_GetAddressType(peeraddress) != LHNETADDRESSTYPE_LOOP && sv.active)
1051                 Host_ShutdownServer ();
1052         // allocate a net connection to keep track of things
1053         cls.netcon = NetConn_Open(mysocket, peeraddress);
1054         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
1055         key_dest = key_game;
1056         m_state = m_none;
1057         cls.demonum = -1;                       // not in the demo loop now
1058         cls.state = ca_connected;
1059         cls.signon = 0;                         // need all the signon messages before playing
1060         cls.protocol = initialprotocol;
1061         if (cls.protocol == PROTOCOL_QUAKEWORLD)
1062                 Cmd_ForwardStringToServer("new");
1063 }
1064
1065 int NetConn_IsLocalGame(void)
1066 {
1067         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
1068                 return true;
1069         return false;
1070 }
1071
1072 static int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1073 {
1074         qboolean fromserver;
1075         int ret, c, control;
1076         const char *s;
1077         char *string, addressstring2[128], cname[128], ipstring[32];
1078         char stringbuf[16384];
1079
1080         // quakeworld ingame packet
1081         fromserver = cls.netcon && mysocket == cls.netcon->mysocket && !LHNETADDRESS_Compare(&cls.netcon->peeraddress, peeraddress);
1082
1083         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1084         {
1085                 // received a command string - strip off the packaging and put it
1086                 // into our string buffer with NULL termination
1087                 data += 4;
1088                 length -= 4;
1089                 length = min(length, (int)sizeof(stringbuf) - 1);
1090                 memcpy(stringbuf, data, length);
1091                 stringbuf[length] = 0;
1092                 string = stringbuf;
1093
1094                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1095
1096                 if (developer_networking.integer)
1097                 {
1098                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
1099                         Com_HexDumpToConsole(data, length);
1100                 }
1101
1102                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
1103                 {
1104                         // darkplaces or quake3
1105                         char protocolnames[1400];
1106                         Protocol_Names(protocolnames, sizeof(protocolnames));
1107                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
1108                         M_Update_Return_Reason("Got challenge response");
1109                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\protocols\\%s\\challenge\\%s", protocolnames, string + 10), peeraddress);
1110                         return true;
1111                 }
1112                 if (length > 1 && string[0] == 'c' && (string[1] == '-' || (string[1] >= '0' && string[1] <= '9')))
1113                 {
1114                         // quakeworld
1115                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1116                         Con_Printf("\"%s\" received, sending QuakeWorld connect request back to %s\n", string, addressstring2);
1117                         M_Update_Return_Reason("Got QuakeWorld challenge response");
1118                         cls.qw_qport = qport.integer;
1119                         NetConn_WriteString(mysocket, va("\377\377\377\377connect 28 %i %i \"%s\"\n", cls.qw_qport, atoi(string + 1), cls.userinfo), peeraddress);
1120                 }
1121                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
1122                 {
1123                         // darkplaces or quake3
1124                         M_Update_Return_Reason("Accepted");
1125                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_DARKPLACES3);
1126                         return true;
1127                 }
1128                 if (length > 1 && string[0] == 'j' && cls.connect_trying)
1129                 {
1130                         // quakeworld
1131                         M_Update_Return_Reason("QuakeWorld Accepted");
1132                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_QUAKEWORLD);
1133                         return true;
1134                 }
1135                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
1136                 {
1137                         char rejectreason[32];
1138                         cls.connect_trying = false;
1139                         string += 7;
1140                         length = max(length - 7, (int)sizeof(rejectreason) - 1);
1141                         memcpy(rejectreason, string, length);
1142                         rejectreason[length] = 0;
1143                         M_Update_Return_Reason(rejectreason);
1144                         return true;
1145                 }
1146                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1147                 {
1148                         serverlist_info_t *info;
1149                         int n;
1150                         double pingtime;
1151
1152                         string += 13;
1153                         // serverlist only uses text addresses
1154                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
1155                         // search the cache for this server and update it
1156                         for( n = 0; n < serverlist_cachecount; n++ )
1157                                 if( !strcmp( cname, serverlist_cache[n].info.cname ) )
1158                                         break;
1159                         if( n == serverlist_cachecount ) {
1160                                 // LAN search doesnt require an answer from the master server so we wont
1161                                 // know the ping nor will it be initialized already...
1162
1163                                 // find a slot
1164                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1165                                         return true;
1166
1167                                 memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1168                                 // store the data the engine cares about (address and ping)
1169                                 strlcpy (serverlist_cache[serverlist_cachecount].info.cname, cname, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1170                                 serverlist_cache[serverlist_cachecount].info.ping = 100000;
1171                                 //serverlist_cache[serverlist_cachecount].querytime = realtime;
1172                                 serverlist_cache[serverlist_cachecount].querytime = Sys_DoubleTime();
1173                                 // if not in the slist menu we should print the server to console
1174                                 if (serverlist_consoleoutput) {
1175                                         Con_Printf("querying %s\n", ipstring);
1176                                 }
1177
1178                                 ++serverlist_cachecount;
1179                         }
1180
1181                         info = &serverlist_cache[n].info;
1182                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));else info->game[0] = 0;
1183                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1184                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1185                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1186                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);else info->protocol = -1;
1187                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);else info->numplayers = 0;
1188                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1189                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);else info->gameversion = 0;
1190
1191                         if (info->ping == 100000)
1192                                         serverreplycount++;
1193
1194                         pingtime = (int)((Sys_DoubleTime() - serverlist_cache[n].querytime) * 1000.0 + 0.5);
1195                         pingtime = bound(0, pingtime, 9999);
1196                         // update the ping
1197                         info->ping = (int)pingtime;
1198
1199                         // legacy/old stuff move it to the menu ASAP
1200
1201                         // build description strings for the things users care about
1202                         dpsnprintf(serverlist_cache[n].line1, sizeof(serverlist_cache[n].line1), "^%c%5d^7 ^%c%3u^7/%3u %-65.65s", pingtime >= 300 ? '1' : (pingtime >= 200 ? '3' : '7'), (int)pingtime, ((info->numplayers > 0 && info->numplayers < info->maxplayers) ? (info->numplayers >= 4 ? '7' : '3') : '1'), info->numplayers, info->maxplayers, info->name);
1203                         dpsnprintf(serverlist_cache[n].line2, sizeof(serverlist_cache[n].line2), "^5%-21.21s %-19.19s ^%c%-17.17s^5 %-20.20s", info->cname, info->game, (info->gameversion != gameversion.integer) ? '1' : '5', info->mod, info->map);
1204                         if( serverlist_cache[n].query == SQS_QUERIED ) {
1205                                 ServerList_ViewList_Remove( &serverlist_cache[n] );
1206                         }
1207                         // if not in the slist menu we should print the server to console (if wanted)
1208                         else if( serverlist_consoleoutput )
1209                                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1210                         // and finally, update the view set
1211                         ServerList_ViewList_Insert( &serverlist_cache[n] );
1212                         serverlist_cache[n].query = SQS_QUERIED;
1213
1214                         return true;
1215                 }
1216                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1217                 {
1218                         // Extract the IP addresses
1219                         data += 18;
1220                         length -= 18;
1221                         masterreplycount++;
1222                         if (serverlist_consoleoutput)
1223                                 Con_Print("received DarkPlaces server list...\n");
1224                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
1225                         {
1226                                 int n;
1227
1228                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], data[5] * 256 + data[6]);
1229                                 if (serverlist_consoleoutput && developer_networking.integer)
1230                                         Con_Printf("Requesting info from DarkPlaces server %s\n", ipstring);
1231                                 // ignore the rest of the message if the serverlist is full
1232                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1233                                         break;
1234                                 // also ignore it if we have already queried it (other master server response)
1235                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1236                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1237                                                 break;
1238                                 if( n >= serverlist_cachecount )
1239                                 {
1240                                         serverquerycount++;
1241
1242                                         memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1243                                         serverlist_cache[serverlist_cachecount].protocol = PROTOCOL_DARKPLACES7;
1244                                         // store the data the engine cares about (address and ping)
1245                                         strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1246                                         serverlist_cache[serverlist_cachecount].info.ping = 100000;
1247                                         serverlist_cache[serverlist_cachecount].query = SQS_QUERYING;
1248
1249                                         ++serverlist_cachecount;
1250                                 }
1251
1252                                 // move on to next address in packet
1253                                 data += 7;
1254                                 length -= 7;
1255                         }
1256                         // begin or resume serverlist queries
1257                         serverlist_querysleep = false;
1258                         serverlist_querywaittime = realtime + 3;
1259                         return true;
1260                 }
1261                 if (!memcmp(string, "d\n", 2) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1262                 {
1263                         // Extract the IP addresses
1264                         data += 2;
1265                         length -= 2;
1266                         masterreplycount++;
1267                         if (serverlist_consoleoutput)
1268                                 Con_Printf("received QuakeWorld server list from %s...\n", addressstring2);
1269                         while (length >= 6 && (data[0] != 0xFF || data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF) && data[4] * 256 + data[5] != 0)
1270                         {
1271                                 int n;
1272
1273                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[0], data[1], data[2], data[3], data[4] * 256 + data[5]);
1274                                 if (serverlist_consoleoutput && developer_networking.integer)
1275                                         Con_Printf("Requesting info from QuakeWorld server %s\n", ipstring);
1276                                 // ignore the rest of the message if the serverlist is full
1277                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1278                                         break;
1279                                 // also ignore it if we have already queried it (other master server response)
1280                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1281                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1282                                                 break;
1283                                 if( n >= serverlist_cachecount )
1284                                 {
1285                                         serverquerycount++;
1286
1287                                         memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1288                                         serverlist_cache[serverlist_cachecount].protocol = PROTOCOL_QUAKEWORLD;
1289                                         // store the data the engine cares about (address and ping)
1290                                         strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1291                                         serverlist_cache[serverlist_cachecount].info.ping = 100000;
1292                                         serverlist_cache[serverlist_cachecount].query = SQS_QUERYING;
1293
1294                                         ++serverlist_cachecount;
1295                                 }
1296
1297                                 // move on to next address in packet
1298                                 data += 6;
1299                                 length -= 6;
1300                         }
1301                         // begin or resume serverlist queries
1302                         serverlist_querysleep = false;
1303                         serverlist_querywaittime = realtime + 3;
1304                         return true;
1305                 }
1306                 /*
1307                 if (!strncmp(string, "ping", 4))
1308                 {
1309                         if (developer.integer >= 10)
1310                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1311                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1312                         return true;
1313                 }
1314                 if (!strncmp(string, "ack", 3))
1315                         return true;
1316                 */
1317                 // QuakeWorld compatibility
1318                 if (length >= 1 && string[0] == 'j' && cls.connect_trying)
1319                 {
1320                         // accept message
1321                         M_Update_Return_Reason("Accepted");
1322                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_QUAKEWORLD);
1323                         return true;
1324                 }
1325                 if (length > 1 && string[0] == 'c' && string[1] >= '0' && string[1] <= '9' && cls.connect_trying)
1326                 {
1327                         // challenge message
1328                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1329                         Con_Printf("challenge %s received, sending connect request back to %s\n", string + 1, addressstring2);
1330                         M_Update_Return_Reason("Got challenge response");
1331                         cls.qw_qport = qport.integer;
1332                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1333                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "name", cl_name.string);
1334                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "topcolor", va("%i", (cl_color.integer >> 4) & 15));
1335                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "bottomcolor", va("%i", (cl_color.integer) & 15));
1336                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "rate", va("%i", cl_rate.integer));
1337                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "msg", "1");
1338                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ver", engineversion);
1339                         NetConn_WriteString(mysocket, va("\377\377\377\377connect %i %i %i \"%s\"\n", 28, cls.qw_qport, atoi(string + 1), cls.userinfo), peeraddress);
1340                         return true;
1341                 }
1342                 if (length > 2 && !memcmp(string, "n\\", 2))
1343                 {
1344                         serverlist_info_t *info;
1345                         int n;
1346                         double pingtime;
1347
1348                         // qw server status
1349                         if (serverlist_consoleoutput && developer_networking.integer >= 2)
1350                                 Con_Printf("QW server status from server at %s:\n%s\n", addressstring2, string + 1);
1351
1352                         string += 1;
1353                         // serverlist only uses text addresses
1354                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
1355                         // search the cache for this server and update it
1356                         for( n = 0; n < serverlist_cachecount; n++ )
1357                                 if( !strcmp( cname, serverlist_cache[n].info.cname ) )
1358                                         break;
1359                         if( n == serverlist_cachecount ) {
1360                                 // LAN search doesnt require an answer from the master server so we wont
1361                                 // know the ping nor will it be initialized already...
1362
1363                                 // find a slot
1364                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1365                                         return true;
1366
1367                                 memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1368                                 // store the data the engine cares about (address and ping)
1369                                 strlcpy (serverlist_cache[serverlist_cachecount].info.cname, cname, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1370                                 serverlist_cache[serverlist_cachecount].info.ping = 100000;
1371                                 //serverlist_cache[serverlist_cachecount].querytime = realtime;
1372                                 serverlist_cache[serverlist_cachecount].querytime = Sys_DoubleTime();
1373                                 // if not in the slist menu we should print the server to console
1374                                 if (serverlist_consoleoutput) {
1375                                         Con_Printf("querying %s\n", ipstring);
1376                                 }
1377
1378                                 ++serverlist_cachecount;
1379                         }
1380
1381                         info = &serverlist_cache[n].info;
1382                         strlcpy(info->game, "QuakeWorld", sizeof(info->game));;
1383                         if ((s = SearchInfostring(string, "*gamedir"     )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1384                         if ((s = SearchInfostring(string, "map"          )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1385                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1386                         info->protocol = 0;
1387                         info->numplayers = 0; // updated below
1388                         if ((s = SearchInfostring(string, "maxclients"   )) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1389                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);else info->gameversion = 0;
1390
1391                         // count active players on server
1392                         // (we could gather more info, but we're just after the number)
1393                         s = strchr(string, '\n');
1394                         if (s)
1395                         {
1396                                 s++;
1397                                 while (s < string + length)
1398                                 {
1399                                         for (;s < string + length && *s != '\n';s++)
1400                                                 ;
1401                                         if (s >= string + length)
1402                                                 break;
1403                                         info->numplayers++;
1404                                         s++;
1405                                 }
1406                         }
1407
1408                         if (info->ping == 100000)
1409                                         serverreplycount++;
1410
1411                         pingtime = (int)((Sys_DoubleTime() - serverlist_cache[n].querytime) * 1000.0 + 0.5);
1412                         pingtime = bound(0, pingtime, 9999);
1413                         // update the ping
1414                         info->ping = (int)pingtime;
1415
1416                         // legacy/old stuff move it to the menu ASAP
1417
1418                         // build description strings for the things users care about
1419                         dpsnprintf(serverlist_cache[n].line1, sizeof(serverlist_cache[n].line1), "^%c%5d^7 ^%c%3u^7/%3u %-65.65s", pingtime >= 300 ? '1' : (pingtime >= 200 ? '3' : '7'), (int)pingtime, ((info->numplayers > 0 && info->numplayers < info->maxplayers) ? (info->numplayers >= 4 ? '7' : '3') : '1'), info->numplayers, info->maxplayers, info->name);
1420                         dpsnprintf(serverlist_cache[n].line2, sizeof(serverlist_cache[n].line2), "^4%-21.21s %-19.19s ^%c%-17.17s^4 %-20.20s", info->cname, info->game, (info->gameversion != gameversion.integer) ? '1' : '4', info->mod, info->map);
1421                         if( serverlist_cache[n].query == SQS_QUERIED ) {
1422                                 ServerList_ViewList_Remove( &serverlist_cache[n] );
1423                         }
1424                         // if not in the slist menu we should print the server to console (if wanted)
1425                         else if( serverlist_consoleoutput )
1426                                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1427                         // and finally, update the view set
1428                         ServerList_ViewList_Insert( &serverlist_cache[n] );
1429                         serverlist_cache[n].query = SQS_QUERIED;
1430
1431                         return true;
1432                 }
1433                 if (string[0] == 'n')
1434                 {
1435                         // qw print command
1436                         Con_Printf("QW print command from server at %s:\n%s\n", addressstring2, string + 1);
1437                 }
1438                 // we may not have liked the packet, but it was a command packet, so
1439                 // we're done processing this packet now
1440                 return true;
1441         }
1442         // quakeworld ingame packet
1443         if (fromserver && cls.protocol == PROTOCOL_QUAKEWORLD && length >= 8 && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol)) == 2)
1444         {
1445                 ret = 0;
1446                 CL_ParseServerMessage();
1447                 return ret;
1448         }
1449         // netquake control packets, supported for compatibility only
1450         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1451         {
1452                 c = data[4];
1453                 data += 5;
1454                 length -= 5;
1455                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1456                 switch (c)
1457                 {
1458                 case CCREP_ACCEPT:
1459                         if (developer.integer >= 10)
1460                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
1461                         if (cls.connect_trying)
1462                         {
1463                                 lhnetaddress_t clientportaddress;
1464                                 clientportaddress = *peeraddress;
1465                                 if (length >= 4)
1466                                 {
1467                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
1468                                         data += 4;
1469                                         length -= 4;
1470                                         LHNETADDRESS_SetPort(&clientportaddress, port);
1471                                 }
1472                                 M_Update_Return_Reason("Accepted");
1473                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress, PROTOCOL_QUAKE);
1474                         }
1475                         break;
1476                 case CCREP_REJECT:
1477                         if (developer.integer >= 10)
1478                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1479                         cls.connect_trying = false;
1480                         M_Update_Return_Reason((char *)data);
1481                         break;
1482 #if 0
1483                 case CCREP_SERVER_INFO:
1484                         if (developer.integer >= 10)
1485                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1486                         if (cls.state != ca_dedicated)
1487                         {
1488                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
1489                                 // string we just ignore it and keep the real address
1490                                 MSG_ReadString();
1491                                 // serverlist only uses text addresses
1492                                 cname = UDP_AddrToString(readaddr);
1493                                 // search the cache for this server
1494                                 for (n = 0; n < hostCacheCount; n++)
1495                                         if (!strcmp(cname, serverlist[n].cname))
1496                                                 break;
1497                                 // add it
1498                                 if (n == hostCacheCount && hostCacheCount < SERVERLISTSIZE)
1499                                 {
1500                                         hostCacheCount++;
1501                                         memset(&serverlist[n], 0, sizeof(serverlist[n]));
1502                                         strlcpy (serverlist[n].name, MSG_ReadString(), sizeof (serverlist[n].name));
1503                                         strlcpy (serverlist[n].map, MSG_ReadString(), sizeof (serverlist[n].map));
1504                                         serverlist[n].users = MSG_ReadByte();
1505                                         serverlist[n].maxusers = MSG_ReadByte();
1506                                         c = MSG_ReadByte();
1507                                         if (c != NET_PROTOCOL_VERSION)
1508                                         {
1509                                                 strlcpy (serverlist[n].cname, serverlist[n].name, sizeof (serverlist[n].cname));
1510                                                 strcpy(serverlist[n].name, "*");
1511                                                 strlcat (serverlist[n].name, serverlist[n].cname, sizeof(serverlist[n].name));
1512                                         }
1513                                         strlcpy (serverlist[n].cname, cname, sizeof (serverlist[n].cname));
1514                                 }
1515                         }
1516                         break;
1517                 case CCREP_PLAYER_INFO:
1518                         // we got a CCREP_PLAYER_INFO??
1519                         //if (developer.integer >= 10)
1520                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1521                         break;
1522                 case CCREP_RULE_INFO:
1523                         // we got a CCREP_RULE_INFO??
1524                         //if (developer.integer >= 10)
1525                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1526                         break;
1527 #endif
1528                 default:
1529                         break;
1530                 }
1531                 // we may not have liked the packet, but it was a valid control
1532                 // packet, so we're done processing this packet now
1533                 return true;
1534         }
1535         ret = 0;
1536         if (fromserver && length >= (int)NET_HEADERSIZE && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol)) == 2)
1537                 CL_ParseServerMessage();
1538         return ret;
1539 }
1540
1541 void NetConn_QueryQueueFrame(void)
1542 {
1543         int index;
1544         int queries;
1545         int maxqueries;
1546         double timeouttime;
1547         static double querycounter = 0;
1548
1549         if (serverlist_querysleep)
1550                 return;
1551
1552         // apply a cool down time after master server replies,
1553         // to avoid messing up the ping times on the servers
1554         if (serverlist_querywaittime > realtime)
1555                 return;
1556
1557         // each time querycounter reaches 1.0 issue a query
1558         querycounter += host_realframetime * net_slist_queriespersecond.value;
1559         maxqueries = (int)querycounter;
1560         maxqueries = bound(0, maxqueries, net_slist_queriesperframe.integer);
1561         querycounter -= maxqueries;
1562
1563         if( maxqueries == 0 ) {
1564                 return;
1565         }
1566
1567         // scan serverlist and issue queries as needed
1568     serverlist_querysleep = true;
1569
1570         timeouttime = realtime - net_slist_timeout.value;
1571         for( index = 0, queries = 0 ; index < serverlist_cachecount && queries < maxqueries ; index++ )
1572         {
1573                 serverlist_entry_t *entry = &serverlist_cache[ index ];
1574                 if( entry->query != SQS_QUERYING )
1575                 {
1576                         continue;
1577                 }
1578
1579         serverlist_querysleep = false;
1580                 if( entry->querycounter != 0 && entry->querytime > timeouttime )
1581                 {
1582                         continue;
1583                 }
1584
1585                 if( entry->querycounter != (unsigned) net_slist_maxtries.integer )
1586                 {
1587                         lhnetaddress_t address;
1588                         int socket;
1589
1590                         LHNETADDRESS_FromString(&address, entry->info.cname, 0);
1591                         if (entry->protocol == PROTOCOL_QUAKEWORLD)
1592                         {
1593                                 for (socket = 0; socket < cl_numsockets ; socket++)
1594                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377status\n", &address);
1595                         }
1596                         else
1597                         {
1598                                 for (socket = 0; socket < cl_numsockets ; socket++)
1599                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377getinfo", &address);
1600                         }
1601
1602                         //entry->querytime = realtime;
1603                         entry->querytime = Sys_DoubleTime();
1604                         entry->querycounter++;
1605
1606                         // if not in the slist menu we should print the server to console
1607                         if (serverlist_consoleoutput)
1608                                 Con_Printf("querying %25s (%i. try)\n", entry->info.cname, entry->querycounter);
1609
1610                         queries++;
1611                 }
1612                 else
1613                 {
1614                         entry->query = SQS_TIMEDOUT;
1615                 }
1616         }
1617 }
1618
1619 void NetConn_ClientFrame(void)
1620 {
1621         int i, length;
1622         lhnetaddress_t peeraddress;
1623         NetConn_UpdateSockets();
1624         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
1625         {
1626                 if (cls.connect_remainingtries == 0)
1627                         M_Update_Return_Reason("Connect: Waiting 10 seconds for reply");
1628                 cls.connect_nextsendtime = realtime + 1;
1629                 cls.connect_remainingtries--;
1630                 if (cls.connect_remainingtries <= -10)
1631                 {
1632                         cls.connect_trying = false;
1633                         M_Update_Return_Reason("Connect: Failed");
1634                         return;
1635                 }
1636                 // try challenge first (newer DP server or QW)
1637                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
1638                 // then try netquake as a fallback (old server, or netquake)
1639                 SZ_Clear(&net_message);
1640                 // save space for the header, filled in later
1641                 MSG_WriteLong(&net_message, 0);
1642                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
1643                 MSG_WriteString(&net_message, "QUAKE");
1644                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1645                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1646                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
1647                 SZ_Clear(&net_message);
1648         }
1649         for (i = 0;i < cl_numsockets;i++)
1650                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1651                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
1652         NetConn_QueryQueueFrame();
1653         if (cls.netcon && realtime > cls.netcon->timeout)
1654         {
1655                 Con_Print("Connection timed out\n");
1656                 CL_Disconnect();
1657                 Host_ShutdownServer ();
1658         }
1659 }
1660
1661 #define MAX_CHALLENGES 128
1662 struct challenge_s
1663 {
1664         lhnetaddress_t address;
1665         double time;
1666         char string[12];
1667 }
1668 challenge[MAX_CHALLENGES];
1669
1670 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
1671 {
1672         int i;
1673         char c;
1674         for (i = 0;i < bufferlength - 1;i++)
1675         {
1676                 do
1677                 {
1678                         c = rand () % (127 - 33) + 33;
1679                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
1680                 buffer[i] = c;
1681         }
1682         buffer[i] = 0;
1683 }
1684
1685 static qboolean NetConn_BuildStatusResponse(const char* challenge, char* out_msg, size_t out_size, qboolean fullstatus)
1686 {
1687         unsigned int nb_clients = 0, i;
1688         int length;
1689
1690         // How many clients are there?
1691         for (i = 0;i < (unsigned int)svs.maxclients;i++)
1692                 if (svs.clients[i].active)
1693                         nb_clients++;
1694
1695         // TODO: we should add more information for the full status string
1696         length = dpsnprintf(out_msg, out_size,
1697                                                 "\377\377\377\377%s\x0A"
1698                                                 "\\gamename\\%s\\modname\\%s\\gameversion\\%d\\sv_maxclients\\%d"
1699                                                 "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d"
1700                                                 "%s%s"
1701                                                 "%s",
1702                                                 fullstatus ? "statusResponse" : "infoResponse",
1703                                                 gamename, com_modname, gameversion.integer, svs.maxclients,
1704                                                 nb_clients, sv.name, hostname.string, NET_PROTOCOL_VERSION,
1705                                                 challenge ? "\\challenge\\" : "", challenge ? challenge : "",
1706                                                 fullstatus ? "\n" : "");
1707
1708         // Make sure it fits in the buffer
1709         if (length < 0)
1710                 return false;
1711
1712         if (fullstatus)
1713         {
1714                 char *ptr;
1715                 int left;
1716
1717                 ptr = out_msg + length;
1718                 left = (int)out_size - length;
1719
1720                 for (i = 0;i < (unsigned int)svs.maxclients;i++)
1721                 {
1722                         client_t *cl = &svs.clients[i];
1723                         if (cl->active)
1724                         {
1725                                 int nameind, cleanind;
1726                                 char curchar;
1727                                 char cleanname [sizeof(cl->name)];
1728
1729                                 // Remove all characters '"' and '\' in the player name
1730                                 nameind = 0;
1731                                 cleanind = 0;
1732                                 do
1733                                 {
1734                                         curchar = cl->name[nameind++];
1735                                         if (curchar != '"' && curchar != '\\')
1736                                         {
1737                                                 cleanname[cleanind++] = curchar;
1738                                                 if (cleanind == sizeof(cleanname) - 1)
1739                                                         break;
1740                                         }
1741                                 } while (curchar != '\0');
1742
1743                                 length = dpsnprintf(ptr, left, "%d %d \"%s\"\n",
1744                                                                         cl->frags,
1745                                                                         (int)(cl->ping * 1000.0f),
1746                                                                         cleanname);
1747                                 if(length < 0)
1748                                         return false;
1749                                 left -= length;
1750                                 ptr += length;
1751                         }
1752                 }
1753         }
1754
1755         return true;
1756 }
1757
1758 extern void SV_SendServerinfo (client_t *client);
1759 static int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1760 {
1761         int i, ret, clientnum, best;
1762         double besttime;
1763         client_t *client;
1764         netconn_t *conn;
1765         char *s, *string, response[1400], addressstring2[128], stringbuf[16384];
1766
1767         // see if we can identify the sender as a local player
1768         // (this is necessary for rcon to send a reliable reply if the client is
1769         //  actually on the server, not sending remotely)
1770         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1771                 if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1772                         break;
1773         if (i == svs.maxclients)
1774                 host_client = NULL;
1775
1776         if (sv.active)
1777         {
1778                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1779                 {
1780                         // received a command string - strip off the packaging and put it
1781                         // into our string buffer with NULL termination
1782                         data += 4;
1783                         length -= 4;
1784                         length = min(length, (int)sizeof(stringbuf) - 1);
1785                         memcpy(stringbuf, data, length);
1786                         stringbuf[length] = 0;
1787                         string = stringbuf;
1788
1789                         if (developer.integer >= 10)
1790                         {
1791                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1792                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1793                                 Com_HexDumpToConsole(data, length);
1794                         }
1795
1796                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
1797                         {
1798                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1799                                 {
1800                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1801                                                 break;
1802                                         if (besttime > challenge[i].time)
1803                                                 besttime = challenge[best = i].time;
1804                                 }
1805                                 // if we did not find an exact match, choose the oldest and
1806                                 // update address and string
1807                                 if (i == MAX_CHALLENGES)
1808                                 {
1809                                         i = best;
1810                                         challenge[i].address = *peeraddress;
1811                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1812                                 }
1813                                 challenge[i].time = realtime;
1814                                 // send the challenge
1815                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1816                                 return true;
1817                         }
1818                         if (length > 8 && !memcmp(string, "connect\\", 8))
1819                         {
1820                                 string += 7;
1821                                 length -= 7;
1822                                 if ((s = SearchInfostring(string, "challenge")))
1823                                 {
1824                                         // validate the challenge
1825                                         for (i = 0;i < MAX_CHALLENGES;i++)
1826                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1827                                                         break;
1828                                         if (i < MAX_CHALLENGES)
1829                                         {
1830                                                 // check engine protocol
1831                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1832                                                 {
1833                                                         if (developer.integer >= 10)
1834                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1835                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1836                                                 }
1837                                                 else
1838                                                 {
1839                                                         // see if this is a duplicate connection request
1840                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1841                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1842                                                                         break;
1843                                                         if (clientnum < svs.maxclients && realtime - client->connecttime < net_messagerejointimeout.value)
1844                                                         {
1845                                                                 // client is still trying to connect,
1846                                                                 // so we send a duplicate reply
1847                                                                 if (developer.integer >= 10)
1848                                                                         Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1849                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1850                                                         }
1851 #if 0
1852                                                         else if (clientnum < svs.maxclients)
1853                                                         {
1854                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1855                                                                 {
1856                                                                         // client crashed and is coming back, keep their stuff intact
1857                                                                         SV_SendServerinfo(client);
1858                                                                         //host_client = client;
1859                                                                         //SV_DropClient (true);
1860                                                                 }
1861                                                                 // else ignore them
1862                                                         }
1863 #endif
1864                                                         else
1865                                                         {
1866                                                                 // this is a new client, find a slot
1867                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1868                                                                         if (!client->active)
1869                                                                                 break;
1870                                                                 if (clientnum < svs.maxclients)
1871                                                                 {
1872                                                                         // prepare the client struct
1873                                                                         if ((conn = NetConn_Open(mysocket, peeraddress)))
1874                                                                         {
1875                                                                                 // allocated connection
1876                                                                                 LHNETADDRESS_ToString(peeraddress, conn->address, sizeof(conn->address), true);
1877                                                                                 if (developer.integer >= 10)
1878                                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1879                                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1880                                                                                 // now set up the client
1881                                                                                 SV_VM_Begin();
1882                                                                                 SV_ConnectClient(clientnum, conn);
1883                                                                                 SV_VM_End();
1884                                                                                 NetConn_Heartbeat(1);
1885                                                                         }
1886                                                                 }
1887                                                                 else
1888                                                                 {
1889                                                                         // server is full
1890                                                                         if (developer.integer >= 10)
1891                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1892                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1893                                                                 }
1894                                                         }
1895                                                 }
1896                                         }
1897                                 }
1898                                 return true;
1899                         }
1900                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1901                         {
1902                                 const char *challenge = NULL;
1903
1904                                 // If there was a challenge in the getinfo message
1905                                 if (length > 8 && string[7] == ' ')
1906                                         challenge = string + 8;
1907
1908                                 if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), false))
1909                                 {
1910                                         if (developer.integer >= 10)
1911                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1912                                         NetConn_WriteString(mysocket, response, peeraddress);
1913                                 }
1914                                 return true;
1915                         }
1916                         if (length >= 9 && !memcmp(string, "getstatus", 9))
1917                         {
1918                                 const char *challenge = NULL;
1919
1920                                 // If there was a challenge in the getinfo message
1921                                 if (length > 10 && string[9] == ' ')
1922                                         challenge = string + 10;
1923
1924                                 if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), true))
1925                                 {
1926                                         if (developer.integer >= 10)
1927                                                 Con_Printf("Sending reply to client %s - %s\n", addressstring2, response);
1928                                         NetConn_WriteString(mysocket, response, peeraddress);
1929                                 }
1930                                 return true;
1931                         }
1932                         if (length >= 5 && !memcmp(string, "rcon ", 5))
1933                         {
1934                                 int i;
1935                                 char *s = string + 5;
1936                                 char password[64];
1937                                 for (i = 0;*s > ' ';s++)
1938                                         if (i < (int)sizeof(password) - 1)
1939                                                 password[i++] = *s;
1940                                 password[i] = 0;
1941                                 if (password[0] > ' ' && !strcmp(rcon_password.string, password))
1942                                 {
1943                                         // looks like a legitimate rcon command with the correct password
1944                                         Con_Printf("server received rcon command from %s:\n%s\n", host_client ? host_client->name : addressstring2, s);
1945                                         rcon_redirect = true;
1946                                         rcon_redirect_bufferpos = 0;
1947                                         Cmd_ExecuteString(s, src_command);
1948                                         rcon_redirect_buffer[rcon_redirect_bufferpos] = 0;
1949                                         rcon_redirect = false;
1950                                         // print resulting text to client
1951                                         // if client is playing, send a reliable reply instead of
1952                                         // a command packet
1953                                         if (host_client)
1954                                         {
1955                                                 // if the netconnection is loop, then this is the
1956                                                 // local player on a listen mode server, and it would
1957                                                 // result in duplicate printing to the console
1958                                                 // (not that the local player should be using rcon
1959                                                 //  when they have the console)
1960                                                 if (host_client->netconnection && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
1961                                                         SV_ClientPrintf("%s", rcon_redirect_buffer);
1962                                         }
1963                                         else
1964                                         {
1965                                                 // qw print command
1966                                                 dpsnprintf(response, sizeof(response), "\377\377\377\377n%s", rcon_redirect_buffer);
1967                                                 NetConn_WriteString(mysocket, response, peeraddress);
1968                                         }
1969                                 }
1970                                 return true;
1971                         }
1972                         /*
1973                         if (!strncmp(string, "ping", 4))
1974                         {
1975                                 if (developer.integer >= 10)
1976                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1977                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1978                                 return true;
1979                         }
1980                         if (!strncmp(string, "ack", 3))
1981                                 return true;
1982                         */
1983                         // we may not have liked the packet, but it was a command packet, so
1984                         // we're done processing this packet now
1985                         return true;
1986                 }
1987                 // LordHavoc: disabled netquake control packet support in server
1988 #if 0
1989                 {
1990                         int c, control;
1991                         // netquake control packets, supported for compatibility only
1992                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1993                         {
1994                                 c = data[4];
1995                                 data += 5;
1996                                 length -= 5;
1997                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1998                                 switch (c)
1999                                 {
2000                                 case CCREQ_CONNECT:
2001                                         if (developer.integer >= 10)
2002                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
2003                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
2004                                         {
2005                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
2006                                                 {
2007                                                         if (developer.integer >= 10)
2008                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
2009                                                         SZ_Clear(&net_message);
2010                                                         // save space for the header, filled in later
2011                                                         MSG_WriteLong(&net_message, 0);
2012                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
2013                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
2014                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2015                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2016                                                         SZ_Clear(&net_message);
2017                                                 }
2018                                                 else
2019                                                 {
2020                                                         // see if this is a duplicate connection request
2021                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2022                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
2023                                                                         break;
2024                                                         if (clientnum < svs.maxclients)
2025                                                         {
2026                                                                 // duplicate connection request
2027                                                                 if (realtime - client->connecttime < 2.0)
2028                                                                 {
2029                                                                         // client is still trying to connect,
2030                                                                         // so we send a duplicate reply
2031                                                                         if (developer.integer >= 10)
2032                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
2033                                                                         SZ_Clear(&net_message);
2034                                                                         // save space for the header, filled in later
2035                                                                         MSG_WriteLong(&net_message, 0);
2036                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
2037                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
2038                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2039                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2040                                                                         SZ_Clear(&net_message);
2041                                                                 }
2042 #if 0
2043                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
2044                                                                 {
2045                                                                         SV_SendServerinfo(client);
2046                                                                         // the old client hasn't sent us anything
2047                                                                         // in quite a while, so kick off and let
2048                                                                         // the retry take care of it...
2049                                                                         //host_client = client;
2050                                                                         //SV_DropClient (true);
2051                                                                 }
2052 #endif
2053                                                         }
2054                                                         else
2055                                                         {
2056                                                                 // this is a new client, find a slot
2057                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2058                                                                         if (!client->active)
2059                                                                                 break;
2060                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
2061                                                                 {
2062                                                                         // connect to the client
2063                                                                         // everything is allocated, just fill in the details
2064                                                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
2065                                                                         if (developer.integer >= 10)
2066                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
2067                                                                         // send back the info about the server connection
2068                                                                         SZ_Clear(&net_message);
2069                                                                         // save space for the header, filled in later
2070                                                                         MSG_WriteLong(&net_message, 0);
2071                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
2072                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
2073                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2074                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2075                                                                         SZ_Clear(&net_message);
2076                                                                         // now set up the client struct
2077                                                                         SV_VM_Begin();
2078                                                                         SV_ConnectClient(clientnum, conn);
2079                                                                         SV_VM_End();
2080                                                                         NetConn_Heartbeat(1);
2081                                                                 }
2082                                                                 else
2083                                                                 {
2084                                                                         if (developer.integer >= 10)
2085                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
2086                                                                         // no room; try to let player know
2087                                                                         SZ_Clear(&net_message);
2088                                                                         // save space for the header, filled in later
2089                                                                         MSG_WriteLong(&net_message, 0);
2090                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
2091                                                                         MSG_WriteString(&net_message, "Server is full.\n");
2092                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2093                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2094                                                                         SZ_Clear(&net_message);
2095                                                                 }
2096                                                         }
2097                                                 }
2098                                         }
2099                                         break;
2100 #if 0
2101                                 case CCREQ_SERVER_INFO:
2102                                         if (developer.integer >= 10)
2103                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
2104                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
2105                                         {
2106                                                 if (developer.integer >= 10)
2107                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
2108                                                 SZ_Clear(&net_message);
2109                                                 // save space for the header, filled in later
2110                                                 MSG_WriteLong(&net_message, 0);
2111                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
2112                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
2113                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
2114                                                 MSG_WriteString(&net_message, hostname.string);
2115                                                 MSG_WriteString(&net_message, sv.name);
2116                                                 MSG_WriteByte(&net_message, net_activeconnections);
2117                                                 MSG_WriteByte(&net_message, svs.maxclients);
2118                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
2119                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2120                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2121                                                 SZ_Clear(&net_message);
2122                                         }
2123                                         break;
2124                                 case CCREQ_PLAYER_INFO:
2125                                         if (developer.integer >= 10)
2126                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
2127                                         if (sv.active)
2128                                         {
2129                                                 int playerNumber, activeNumber, clientNumber;
2130                                                 client_t *client;
2131
2132                                                 playerNumber = MSG_ReadByte();
2133                                                 activeNumber = -1;
2134                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
2135                                                         if (client->active && ++activeNumber == playerNumber)
2136                                                                 break;
2137                                                 if (clientNumber != svs.maxclients)
2138                                                 {
2139                                                         SZ_Clear(&net_message);
2140                                                         // save space for the header, filled in later
2141                                                         MSG_WriteLong(&net_message, 0);
2142                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
2143                                                         MSG_WriteByte(&net_message, playerNumber);
2144                                                         MSG_WriteString(&net_message, client->name);
2145                                                         MSG_WriteLong(&net_message, client->colors);
2146                                                         MSG_WriteLong(&net_message, (int)client->edict->fields.server->frags);
2147                                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
2148                                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
2149                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2150                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2151                                                         SZ_Clear(&net_message);
2152                                                 }
2153                                         }
2154                                         break;
2155                                 case CCREQ_RULE_INFO:
2156                                         if (developer.integer >= 10)
2157                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
2158                                         if (sv.active)
2159                                         {
2160                                                 char *prevCvarName;
2161                                                 cvar_t *var;
2162
2163                                                 // find the search start location
2164                                                 prevCvarName = MSG_ReadString();
2165                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
2166
2167                                                 // send the response
2168                                                 SZ_Clear(&net_message);
2169                                                 // save space for the header, filled in later
2170                                                 MSG_WriteLong(&net_message, 0);
2171                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
2172                                                 if (var)
2173                                                 {
2174                                                         MSG_WriteString(&net_message, var->name);
2175                                                         MSG_WriteString(&net_message, var->string);
2176                                                 }
2177                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2178                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2179                                                 SZ_Clear(&net_message);
2180                                         }
2181                                         break;
2182 #endif
2183                                 default:
2184                                         break;
2185                                 }
2186                                 // we may not have liked the packet, but it was a valid control
2187                                 // packet, so we're done processing this packet now
2188                                 return true;
2189                         }
2190                 }
2191 #endif
2192                 if (host_client)
2193                 {
2194                         if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length, sv.protocol)) == 2)
2195                         {
2196                                 SV_VM_Begin();
2197                                 SV_ReadClientMessage();
2198                                 SV_VM_End();
2199                                 return ret;
2200                         }
2201                 }
2202         }
2203         return 0;
2204 }
2205
2206 void NetConn_ServerFrame(void)
2207 {
2208         int i, length;
2209         lhnetaddress_t peeraddress;
2210         NetConn_UpdateSockets();
2211         for (i = 0;i < sv_numsockets;i++)
2212                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
2213                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
2214         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
2215         {
2216                 // never timeout loopback connections
2217                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
2218                 {
2219                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
2220                         SV_VM_Begin();
2221                         SV_DropClient(false);
2222                         SV_VM_End();
2223                 }
2224         }
2225 }
2226
2227 void NetConn_QueryMasters(qboolean querydp, qboolean queryqw)
2228 {
2229         int i;
2230         int masternum;
2231         lhnetaddress_t masteraddress;
2232         lhnetaddress_t broadcastaddress;
2233         char request[256];
2234
2235         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
2236                 return;
2237
2238         // 26000 is the default quake server port, servers on other ports will not
2239         // be found
2240         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
2241         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
2242
2243         if (querydp)
2244         {
2245                 for (i = 0;i < cl_numsockets;i++)
2246                 {
2247                         if (cl_sockets[i])
2248                         {
2249                                 // search LAN for Quake servers
2250                                 SZ_Clear(&net_message);
2251                                 // save space for the header, filled in later
2252                                 MSG_WriteLong(&net_message, 0);
2253                                 MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
2254                                 MSG_WriteString(&net_message, "QUAKE");
2255                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
2256                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2257                                 NetConn_Write(cl_sockets[i], net_message.data, net_message.cursize, &broadcastaddress);
2258                                 SZ_Clear(&net_message);
2259
2260                                 // search LAN for DarkPlaces servers
2261                                 NetConn_WriteString(cl_sockets[i], "\377\377\377\377getinfo", &broadcastaddress);
2262
2263                                 // build the getservers message to send to the dpmaster master servers
2264                                 dpsnprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
2265
2266                                 // search internet
2267                                 for (masternum = 0;sv_masters[masternum].name;masternum++)
2268                                 {
2269                                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, DPMASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
2270                                         {
2271                                                 masterquerycount++;
2272                                                 NetConn_WriteString(cl_sockets[i], request, &masteraddress);
2273                                         }
2274                                 }
2275                         }
2276                 }
2277         }
2278
2279         // only query QuakeWorld servers when the user wants to
2280         if (queryqw)
2281         {
2282                 for (i = 0;i < cl_numsockets;i++)
2283                 {
2284                         if (cl_sockets[i])
2285                         {
2286                                 // search LAN for QuakeWorld servers
2287                                 NetConn_WriteString(cl_sockets[i], "\377\377\377\377status\n", &broadcastaddress);
2288
2289                                 // build the getservers message to send to the qwmaster master servers
2290                                 // note this has no -1 prefix, and the trailing nul byte is sent
2291                                 dpsnprintf(request, sizeof(request), "c\n");
2292
2293                                 // search internet
2294                                 for (masternum = 0;sv_qwmasters[masternum].name;masternum++)
2295                                 {
2296                                         if (sv_qwmasters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_qwmasters[masternum].string, QWMASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
2297                                         {
2298                                                 if (m_state != m_slist)
2299                                                 {
2300                                                         char lookupstring[128];
2301                                                         LHNETADDRESS_ToString(&masteraddress, lookupstring, sizeof(lookupstring), true);
2302                                                         Con_Printf("Querying master %s (resolved from %s)\n", lookupstring, sv_qwmasters[masternum].string);
2303                                                 }
2304                                                 masterquerycount++;
2305                                                 NetConn_Write(cl_sockets[i], request, 7, &masteraddress);
2306                                         }
2307                                 }
2308                         }
2309                 }
2310         }
2311         if (!masterquerycount)
2312         {
2313                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
2314                 M_Update_Return_Reason("No network");
2315         }
2316 }
2317
2318 void NetConn_Heartbeat(int priority)
2319 {
2320         lhnetaddress_t masteraddress;
2321         int masternum;
2322         lhnetsocket_t *mysocket;
2323
2324         // if it's a state change (client connected), limit next heartbeat to no
2325         // more than 30 sec in the future
2326         if (priority == 1 && nextheartbeattime > realtime + 30.0)
2327                 nextheartbeattime = realtime + 30.0;
2328
2329         // limit heartbeatperiod to 30 to 270 second range,
2330         // lower limit is to avoid abusing master servers with excess traffic,
2331         // upper limit is to avoid timing out on the master server (which uses
2332         // 300 sec timeout)
2333         if (sv_heartbeatperiod.value < 30)
2334                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
2335         if (sv_heartbeatperiod.value > 270)
2336                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
2337
2338         // make advertising optional and don't advertise singleplayer games, and
2339         // only send a heartbeat as often as the admin wants
2340         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
2341         {
2342                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
2343                 for (masternum = 0;sv_masters[masternum].name;masternum++)
2344                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, DPMASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
2345                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
2346         }
2347 }
2348
2349 static void Net_Heartbeat_f(void)
2350 {
2351         if (sv.active)
2352                 NetConn_Heartbeat(2);
2353         else
2354                 Con_Print("No server running, can not heartbeat to master server.\n");
2355 }
2356
2357 void PrintStats(netconn_t *conn)
2358 {
2359         if ((cls.state == ca_connected && cls.protocol == PROTOCOL_QUAKEWORLD) || (sv.active && sv.protocol == PROTOCOL_QUAKEWORLD))
2360                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->qw.outgoing_sequence, conn->qw.incoming_sequence);
2361         else
2362                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->nq.sendSequence, conn->nq.receiveSequence);
2363 }
2364
2365 void Net_Stats_f(void)
2366 {
2367         netconn_t *conn;
2368         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
2369         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
2370         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
2371         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
2372         Con_Printf("packetsSent                = %i\n", packetsSent);
2373         Con_Printf("packetsReSent              = %i\n", packetsReSent);
2374         Con_Printf("packetsReceived            = %i\n", packetsReceived);
2375         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
2376         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
2377         Con_Print("connections                =\n");
2378         for (conn = netconn_list;conn;conn = conn->next)
2379                 PrintStats(conn);
2380 }
2381
2382 void Net_Slist_f(void)
2383 {
2384         ServerList_ResetMasks();
2385         serverlist_sortbyfield = SLIF_PING;
2386         serverlist_sortdescending = false;
2387     if (m_state != m_slist) {
2388                 Con_Print("Sending requests to master servers\n");
2389                 ServerList_QueryList(true, false);
2390                 serverlist_consoleoutput = true;
2391                 Con_Print("Listening for replies...\n");
2392         } else
2393                 ServerList_QueryList(true, false);
2394 }
2395
2396 void Net_SlistQW_f(void)
2397 {
2398         ServerList_ResetMasks();
2399         serverlist_sortbyfield = SLIF_PING;
2400         serverlist_sortdescending = false;
2401     if (m_state != m_slist) {
2402                 Con_Print("Sending requests to master servers\n");
2403                 ServerList_QueryList(false, true);
2404                 serverlist_consoleoutput = true;
2405                 Con_Print("Listening for replies...\n");
2406         } else
2407                 ServerList_QueryList(false, true);
2408 }
2409
2410 void NetConn_Init(void)
2411 {
2412         int i;
2413         lhnetaddress_t tempaddress;
2414         netconn_mempool = Mem_AllocPool("network connections", 0, NULL);
2415         Cmd_AddCommand("net_stats", Net_Stats_f, "print network statistics");
2416         Cmd_AddCommand("net_slist", Net_Slist_f, "query dp master servers and print all server information");
2417         Cmd_AddCommand("net_slistqw", Net_SlistQW_f, "query qw master servers and print all server information");
2418         Cmd_AddCommand("heartbeat", Net_Heartbeat_f, "send a heartbeat to the master server (updates your server information)");
2419         Cvar_RegisterVariable(&net_slist_queriespersecond);
2420         Cvar_RegisterVariable(&net_slist_queriesperframe);
2421         Cvar_RegisterVariable(&net_slist_timeout);
2422         Cvar_RegisterVariable(&net_slist_maxtries);
2423         Cvar_RegisterVariable(&net_messagetimeout);
2424         Cvar_RegisterVariable(&net_messagerejointimeout);
2425         Cvar_RegisterVariable(&net_connecttimeout);
2426         Cvar_RegisterVariable(&cl_netlocalping);
2427         Cvar_RegisterVariable(&cl_netpacketloss);
2428         Cvar_RegisterVariable(&hostname);
2429         Cvar_RegisterVariable(&developer_networking);
2430         Cvar_RegisterVariable(&cl_netport);
2431         Cvar_RegisterVariable(&sv_netport);
2432         Cvar_RegisterVariable(&net_address);
2433         //Cvar_RegisterVariable(&net_address_ipv6);
2434         Cvar_RegisterVariable(&sv_public);
2435         Cvar_RegisterVariable(&sv_heartbeatperiod);
2436         for (i = 0;sv_masters[i].name;i++)
2437                 Cvar_RegisterVariable(&sv_masters[i]);
2438         Cvar_RegisterVariable(&gameversion);
2439 // 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.
2440         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
2441         {
2442                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
2443                 {
2444                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
2445                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
2446                 }
2447                 else
2448                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
2449         }
2450 // 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
2451         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
2452         {
2453                 i = atoi(com_argv[i + 1]);
2454                 if (i >= 0 && i < 65536)
2455                 {
2456                         Con_Printf("-port option used, setting port cvar to %i\n", i);
2457                         Cvar_SetValueQuick(&sv_netport, i);
2458                 }
2459                 else
2460                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
2461         }
2462         cl_numsockets = 0;
2463         sv_numsockets = 0;
2464         net_message.data = net_message_buf;
2465         net_message.maxsize = sizeof(net_message_buf);
2466         net_message.cursize = 0;
2467         LHNET_Init();
2468 }
2469
2470 void NetConn_Shutdown(void)
2471 {
2472         NetConn_CloseClientPorts();
2473         NetConn_CloseServerPorts();
2474         LHNET_Shutdown();
2475 }
2476