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 // for secure rcon authentication
  27 #include "hmac.h"
  28 #include "mdfour.h"
  29 #include <time.h>
  30
  31 #define QWMASTER_PORT 27000
  32 #define DPMASTER_PORT 27950
  33
  34 // note this defaults on for dedicated servers, off for listen servers
  35 cvar_t sv_public = {0, "sv_public", "0", "1: advertises this server on the master server (so that players can find it in the server browser); 0: allow direct queries only; -1: do not respond to direct queries; -2: do not allow anyone to connect"};
  36 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "120", "how often to send heartbeat in seconds (only used if sv_public is 1)"};
  37
  38 static cvar_t sv_masters [] =
  39 {
  40         {CVAR_SAVE, "sv_master1", "", "user-chosen master server 1"},
  41         {CVAR_SAVE, "sv_master2", "", "user-chosen master server 2"},
  42         {CVAR_SAVE, "sv_master3", "", "user-chosen master server 3"},
  43         {CVAR_SAVE, "sv_master4", "", "user-chosen master server 4"},
  44         {0, "sv_masterextra1", "69.59.212.88", "ghdigital.com - default master server 1 (admin: LordHavoc)"}, // admin: LordHavoc
  45         {0, "sv_masterextra2", "64.22.107.125", "dpmaster.deathmask.net - default master server 2 (admin: Willis)"}, // admin: Willis
  46         {0, "sv_masterextra3", "92.62.40.73", "dpmaster.tchr.no - default master server 3 (admin: tChr)"}, // admin: tChr
  47         {0, NULL, NULL, NULL}
  48 };
  49
  50 static cvar_t sv_qwmasters [] =
  51 {
  52         {CVAR_SAVE, "sv_qwmaster1", "", "user-chosen qwmaster server 1"},
  53         {CVAR_SAVE, "sv_qwmaster2", "", "user-chosen qwmaster server 2"},
  54         {CVAR_SAVE, "sv_qwmaster3", "", "user-chosen qwmaster server 3"},
  55         {CVAR_SAVE, "sv_qwmaster4", "", "user-chosen qwmaster server 4"},
  56         {0, "sv_qwmasterextra1", "master.quakeservers.net:27000", "Global master server. (admin: unknown)"},
  57         {0, "sv_qwmasterextra2", "asgaard.morphos-team.net:27000", "Global master server. (admin: unknown)"},
  58         {0, "sv_qwmasterextra3", "qwmaster.ocrana.de:27000", "German master server. (admin: unknown)"},
  59         {0, "sv_qwmasterextra4", "masterserver.exhale.de:27000", "German master server. (admin: unknown)"},
  60         {0, "sv_qwmasterextra5", "kubus.rulez.pl:27000", "Poland master server. (admin: unknown)"},
  61         {0, NULL, NULL, NULL}
  62 };
  63
  64 static double nextheartbeattime = 0;
  65
  66 sizebuf_t net_message;
  67 static unsigned char net_message_buf[NET_MAXMESSAGE];
  68
  69 cvar_t net_messagetimeout = {0, "net_messagetimeout","300", "drops players who have not sent any packets for this many seconds"};
  70 cvar_t net_connecttimeout = {0, "net_connecttimeout","15", "after requesting a connection, the client must reply within this many seconds or be dropped (cuts down on connect floods). Must be above 10 seconds."};
  71 cvar_t net_connectfloodblockingtimeout = {0, "net_connectfloodblockingtimeout", "5", "when a connection packet is received, it will block all future connect packets from that IP address for this many seconds (cuts down on connect floods)"};
  72 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED", "server message to show in server browser"};
  73 cvar_t developer_networking = {0, "developer_networking", "0", "prints all received and sent packets (recommended only for debugging)"};
  74
  75 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)"};
  76 static cvar_t cl_netpacketloss_send = {0, "cl_netpacketloss_send","0", "drops this percentage of outgoing packets, useful for testing network protocol robustness (jerky movement, prediction errors, etc)"};
  77 static cvar_t cl_netpacketloss_receive = {0, "cl_netpacketloss_receive","0", "drops this percentage of incoming packets, useful for testing network protocol robustness (jerky movement, effects failing to start, sounds failing to play, etc)"};
  78 static cvar_t net_slist_queriespersecond = {0, "net_slist_queriespersecond", "20", "how many server information requests to send per second"};
  79 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)"};
  80 static cvar_t net_slist_timeout = {0, "net_slist_timeout", "4", "how long to listen for a server information response before giving up"};
  81 static cvar_t net_slist_pause = {0, "net_slist_pause", "0", "when set to 1, the server list won't update until it is set back to 0"};
  82 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)"};
  83 static cvar_t net_slist_favorites = {CVAR_SAVE | CVAR_NQUSERINFOHACK, "net_slist_favorites", "", "contains a list of IP addresses and ports to always query explicitly"};
  84 static cvar_t gameversion = {0, "gameversion", "0", "version of game data (mod-specific) to be sent to querying clients"};
  85 static cvar_t gameversion_min = {0, "gameversion_min", "-1", "minimum version of game data (mod-specific), when client and server gameversion mismatch in the server browser the server is shown as incompatible; if -1, gameversion is used alone"};
  86 static cvar_t gameversion_max = {0, "gameversion_max", "-1", "maximum version of game data (mod-specific), when client and server gameversion mismatch in the server browser the server is shown as incompatible; if -1, gameversion is used alone"};
  87 static cvar_t rcon_restricted_password = {CVAR_PRIVATE, "rcon_restricted_password", "", "password to authenticate rcon commands in restricted mode"};
  88 static cvar_t rcon_restricted_commands = {0, "rcon_restricted_commands", "", "allowed commands for rcon when the restricted mode password was used"};
  89 static cvar_t rcon_secure_maxdiff = {0, "rcon_secure_maxdiff", "5", "maximum time difference between rcon request and server system clock (to protect against replay attack)"};
  90 extern cvar_t rcon_secure;
  91 extern cvar_t rcon_secure_challengetimeout;
  92
  93 /* statistic counters */
  94 static int packetsSent = 0;
  95 static int packetsReSent = 0;
  96 static int packetsReceived = 0;
  97 static int receivedDuplicateCount = 0;
  98 static int droppedDatagrams = 0;
  99
 100 static int unreliableMessagesSent = 0;
 101 static int unreliableMessagesReceived = 0;
 102 static int reliableMessagesSent = 0;
 103 static int reliableMessagesReceived = 0;
 104
 105 double masterquerytime = -1000;
 106 int masterquerycount = 0;
 107 int masterreplycount = 0;
 108 int serverquerycount = 0;
 109 int serverreplycount = 0;
 110
 111 /// this is only false if there are still servers left to query
 112 static qboolean serverlist_querysleep = true;
 113 static qboolean serverlist_paused = false;
 114 /// this is pushed a second or two ahead of realtime whenever a master server
 115 /// reply is received, to avoid issuing queries while master replies are still
 116 /// flooding in (which would make a mess of the ping times)
 117 static double serverlist_querywaittime = 0;
 118
 119 static unsigned char sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
 120 static unsigned char readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
 121
 122 static int cl_numsockets;
 123 static lhnetsocket_t *cl_sockets[16];
 124 static int sv_numsockets;
 125 static lhnetsocket_t *sv_sockets[16];
 126
 127 netconn_t *netconn_list = NULL;
 128 mempool_t *netconn_mempool = NULL;
 129
 130 cvar_t cl_netport = {0, "cl_port", "0", "forces client to use chosen port number if not 0"};
 131 cvar_t sv_netport = {0, "port", "26000", "server port for players to connect to"};
 132 cvar_t net_address = {0, "net_address", "", "network address to open ipv4 ports on (if empty, use default interfaces)"};
 133 cvar_t net_address_ipv6 = {0, "net_address_ipv6", "", "network address to open ipv6 ports on (if empty, use default interfaces)"};
 134
 135 char net_extresponse[NET_EXTRESPONSE_MAX][1400];
 136 int net_extresponse_count = 0;
 137 int net_extresponse_last = 0;
 138
 139 // ServerList interface
 140 serverlist_mask_t serverlist_andmasks[SERVERLIST_ANDMASKCOUNT];
 141 serverlist_mask_t serverlist_ormasks[SERVERLIST_ORMASKCOUNT];
 142
 143 serverlist_infofield_t serverlist_sortbyfield;
 144 int serverlist_sortflags;
 145
 146 int serverlist_viewcount = 0;
 147 serverlist_entry_t *serverlist_viewlist[SERVERLIST_VIEWLISTSIZE];
 148
 149 int serverlist_cachecount;
 150 serverlist_entry_t serverlist_cache[SERVERLIST_TOTALSIZE];
 151
 152 qboolean serverlist_consoleoutput;
 153
 154 static int nFavorites = 0;
 155 static lhnetaddress_t favorites[256];
 156
 157 void NetConn_UpdateFavorites(void)
 158 {
 159         const char *p;
 160         nFavorites = 0;
 161         p = net_slist_favorites.string;
 162         while((size_t) nFavorites < sizeof(favorites) / sizeof(*favorites) && COM_ParseToken_Console(&p))
 163         {
 164                 if(LHNETADDRESS_FromString(&favorites[nFavorites], com_token, 26000))
 165                         ++nFavorites;
 166         }
 167 }
 168
 169 /// helper function to insert a value into the viewset
 170 /// spare entries will be removed
 171 static void _ServerList_ViewList_Helper_InsertBefore( int index, serverlist_entry_t *entry )
 172 {
 173     int i;
 174         if( serverlist_viewcount < SERVERLIST_VIEWLISTSIZE ) {
 175                 i = serverlist_viewcount++;
 176         } else {
 177                 i = SERVERLIST_VIEWLISTSIZE - 1;
 178         }
 179
 180         for( ; i > index ; i-- )
 181                 serverlist_viewlist[ i ] = serverlist_viewlist[ i - 1 ];
 182
 183         serverlist_viewlist[index] = entry;
 184 }
 185
 186 /// we suppose serverlist_viewcount to be valid, ie > 0
 187 static void _ServerList_ViewList_Helper_Remove( int index )
 188 {
 189         serverlist_viewcount--;
 190         for( ; index < serverlist_viewcount ; index++ )
 191                 serverlist_viewlist[index] = serverlist_viewlist[index + 1];
 192 }
 193
 194 /// \returns true if A should be inserted before B
 195 static qboolean _ServerList_Entry_Compare( serverlist_entry_t *A, serverlist_entry_t *B )
 196 {
 197         int result = 0; // > 0 if for numbers A > B and for text if A < B
 198
 199         if( serverlist_sortflags & SLSF_FAVORITESFIRST )
 200         {
 201                 if(A->info.isfavorite != B->info.isfavorite)
 202                         return A->info.isfavorite;
 203         }
 204
 205         switch( serverlist_sortbyfield ) {
 206                 case SLIF_PING:
 207                         result = A->info.ping - B->info.ping;
 208                         break;
 209                 case SLIF_MAXPLAYERS:
 210                         result = A->info.maxplayers - B->info.maxplayers;
 211                         break;
 212                 case SLIF_NUMPLAYERS:
 213                         result = A->info.numplayers - B->info.numplayers;
 214                         break;
 215                 case SLIF_NUMBOTS:
 216                         result = A->info.numbots - B->info.numbots;
 217                         break;
 218                 case SLIF_NUMHUMANS:
 219                         result = A->info.numhumans - B->info.numhumans;
 220                         break;
 221                 case SLIF_FREESLOTS:
 222                         result = A->info.freeslots - B->info.freeslots;
 223                         break;
 224                 case SLIF_PROTOCOL:
 225                         result = A->info.protocol - B->info.protocol;
 226                         break;
 227                 case SLIF_CNAME:
 228                         result = strcmp( B->info.cname, A->info.cname );
 229                         break;
 230                 case SLIF_GAME:
 231                         result = strcasecmp( B->info.game, A->info.game );
 232                         break;
 233                 case SLIF_MAP:
 234                         result = strcasecmp( B->info.map, A->info.map );
 235                         break;
 236                 case SLIF_MOD:
 237                         result = strcasecmp( B->info.mod, A->info.mod );
 238                         break;
 239                 case SLIF_NAME:
 240                         result = strcasecmp( B->info.name, A->info.name );
 241                         break;
 242                 case SLIF_QCSTATUS:
 243                         result = strcasecmp( B->info.qcstatus, A->info.qcstatus ); // not really THAT useful, though
 244                         break;
 245                 case SLIF_ISFAVORITE:
 246                         result = !!B->info.isfavorite - !!A->info.isfavorite;
 247                         break;
 248                 default:
 249                         Con_DPrint( "_ServerList_Entry_Compare: Bad serverlist_sortbyfield!\n" );
 250                         break;
 251         }
 252
 253         if (result != 0)
 254         {
 255                 if( serverlist_sortflags & SLSF_DESCENDING )
 256                         return result > 0;
 257                 else
 258                         return result < 0;
 259         }
 260
 261         // if the chosen sort key is identical, sort by index
 262         // (makes this a stable sort, so that later replies from servers won't
 263         //  shuffle the servers around when they have the same ping)
 264         return A < B;
 265 }
 266
 267 static qboolean _ServerList_CompareInt( int A, serverlist_maskop_t op, int B )
 268 {
 269         // This should actually be done with some intermediate and end-of-function return
 270         switch( op ) {
 271                 case SLMO_LESS:
 272                         return A < B;
 273                 case SLMO_LESSEQUAL:
 274                         return A <= B;
 275                 case SLMO_EQUAL:
 276                         return A == B;
 277                 case SLMO_GREATER:
 278                         return A > B;
 279                 case SLMO_NOTEQUAL:
 280                         return A != B;
 281                 case SLMO_GREATEREQUAL:
 282                 case SLMO_CONTAINS:
 283                 case SLMO_NOTCONTAIN:
 284                 case SLMO_STARTSWITH:
 285                 case SLMO_NOTSTARTSWITH:
 286                         return A >= B;
 287                 default:
 288                         Con_DPrint( "_ServerList_CompareInt: Bad op!\n" );
 289                         return false;
 290         }
 291 }
 292
 293 static qboolean _ServerList_CompareStr( const char *A, serverlist_maskop_t op, const char *B )
 294 {
 295         int i;
 296         char bufferA[ 1400 ], bufferB[ 1400 ]; // should be more than enough
 297         COM_StringDecolorize(A, 0, bufferA, sizeof(bufferA), false);
 298         for (i = 0;i < (int)sizeof(bufferA)-1 && bufferA[i];i++)
 299                 bufferA[i] = (bufferA[i] >= 'A' && bufferA[i] <= 'Z') ? (bufferA[i] + 'a' - 'A') : bufferA[i];
 300         bufferA[i] = 0;
 301         for (i = 0;i < (int)sizeof(bufferB)-1 && B[i];i++)
 302                 bufferB[i] = (B[i] >= 'A' && B[i] <= 'Z') ? (B[i] + 'a' - 'A') : B[i];
 303         bufferB[i] = 0;
 304
 305         // Same here, also using an intermediate & final return would be more appropriate
 306         // A info B mask
 307         switch( op ) {
 308                 case SLMO_CONTAINS:
 309                         return *bufferB && !!strstr( bufferA, bufferB ); // we want a real bool
 310                 case SLMO_NOTCONTAIN:
 311                         return !*bufferB || !strstr( bufferA, bufferB );
 312                 case SLMO_STARTSWITH:
 313                         //Con_Printf("startsWith: %s %s\n", bufferA, bufferB);
 314                         return *bufferB && !memcmp(bufferA, bufferB, strlen(bufferB));
 315                 case SLMO_NOTSTARTSWITH:
 316                         return !*bufferB || memcmp(bufferA, bufferB, strlen(bufferB));
 317                 case SLMO_LESS:
 318                         return strcmp( bufferA, bufferB ) < 0;
 319                 case SLMO_LESSEQUAL:
 320                         return strcmp( bufferA, bufferB ) <= 0;
 321                 case SLMO_EQUAL:
 322                         return strcmp( bufferA, bufferB ) == 0;
 323                 case SLMO_GREATER:
 324                         return strcmp( bufferA, bufferB ) > 0;
 325                 case SLMO_NOTEQUAL:
 326                         return strcmp( bufferA, bufferB ) != 0;
 327                 case SLMO_GREATEREQUAL:
 328                         return strcmp( bufferA, bufferB ) >= 0;
 329                 default:
 330                         Con_DPrint( "_ServerList_CompareStr: Bad op!\n" );
 331                         return false;
 332         }
 333 }
 334
 335 static qboolean _ServerList_Entry_Mask( serverlist_mask_t *mask, serverlist_info_t *info )
 336 {
 337         if( !_ServerList_CompareInt( info->ping, mask->tests[SLIF_PING], mask->info.ping ) )
 338                 return false;
 339         if( !_ServerList_CompareInt( info->maxplayers, mask->tests[SLIF_MAXPLAYERS], mask->info.maxplayers ) )
 340                 return false;
 341         if( !_ServerList_CompareInt( info->numplayers, mask->tests[SLIF_NUMPLAYERS], mask->info.numplayers ) )
 342                 return false;
 343         if( !_ServerList_CompareInt( info->numbots, mask->tests[SLIF_NUMBOTS], mask->info.numbots ) )
 344                 return false;
 345         if( !_ServerList_CompareInt( info->numhumans, mask->tests[SLIF_NUMHUMANS], mask->info.numhumans ) )
 346                 return false;
 347         if( !_ServerList_CompareInt( info->freeslots, mask->tests[SLIF_FREESLOTS], mask->info.freeslots ) )
 348                 return false;
 349         if( !_ServerList_CompareInt( info->protocol, mask->tests[SLIF_PROTOCOL], mask->info.protocol ))
 350                 return false;
 351         if( *mask->info.cname
 352                 && !_ServerList_CompareStr( info->cname, mask->tests[SLIF_CNAME], mask->info.cname ) )
 353                 return false;
 354         if( *mask->info.game
 355                 && !_ServerList_CompareStr( info->game, mask->tests[SLIF_GAME], mask->info.game ) )
 356                 return false;
 357         if( *mask->info.mod
 358                 && !_ServerList_CompareStr( info->mod, mask->tests[SLIF_MOD], mask->info.mod ) )
 359                 return false;
 360         if( *mask->info.map
 361                 && !_ServerList_CompareStr( info->map, mask->tests[SLIF_MAP], mask->info.map ) )
 362                 return false;
 363         if( *mask->info.name
 364                 && !_ServerList_CompareStr( info->name, mask->tests[SLIF_NAME], mask->info.name ) )
 365                 return false;
 366         if( *mask->info.qcstatus
 367                 && !_ServerList_CompareStr( info->qcstatus, mask->tests[SLIF_QCSTATUS], mask->info.qcstatus ) )
 368                 return false;
 369         if( *mask->info.players
 370                 && !_ServerList_CompareStr( info->players, mask->tests[SLIF_PLAYERS], mask->info.players ) )
 371                 return false;
 372         if( !_ServerList_CompareInt( info->isfavorite, mask->tests[SLIF_ISFAVORITE], mask->info.isfavorite ))
 373                 return false;
 374         return true;
 375 }
 376
 377 static void ServerList_ViewList_Insert( serverlist_entry_t *entry )
 378 {
 379         int start, end, mid, i;
 380         lhnetaddress_t addr;
 381
 382         // reject incompatible servers
 383         if(
 384                 entry->info.gameversion != gameversion.integer
 385                 &&
 386                 !(
 387                            gameversion_min.integer >= 0 // min/max range set by user/mod?
 388                         && gameversion_max.integer >= 0
 389                         && gameversion_min.integer >= entry->info.gameversion // version of server in min/max range?
 390                         && gameversion_max.integer <= entry->info.gameversion
 391                  )
 392         )
 393                 return;
 394
 395         // refresh the "favorite" status
 396         entry->info.isfavorite = false;
 397         if(LHNETADDRESS_FromString(&addr, entry->info.cname, 26000))
 398         {
 399                 for(i = 0; i < nFavorites; ++i)
 400                 {
 401                         if(LHNETADDRESS_Compare(&addr, &favorites[i]) == 0)
 402                         {
 403                                 entry->info.isfavorite = true;
 404                                 break;
 405                         }
 406                 }
 407         }
 408
 409         // FIXME: change this to be more readable (...)
 410         // now check whether it passes through the masks
 411         for( start = 0 ; start < SERVERLIST_ANDMASKCOUNT && serverlist_andmasks[start].active; start++ )
 412                 if( !_ServerList_Entry_Mask( &serverlist_andmasks[start], &entry->info ) )
 413                         return;
 414
 415         for( start = 0 ; start < SERVERLIST_ORMASKCOUNT && serverlist_ormasks[start].active ; start++ )
 416                 if( _ServerList_Entry_Mask( &serverlist_ormasks[start], &entry->info ) )
 417                         break;
 418         if( start == SERVERLIST_ORMASKCOUNT || (start > 0 && !serverlist_ormasks[start].active) )
 419                 return;
 420
 421         if( !serverlist_viewcount ) {
 422                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 423                 return;
 424         }
 425         // ok, insert it, we just need to find out where exactly:
 426
 427         // two special cases
 428         // check whether to insert it as new first item
 429         if( _ServerList_Entry_Compare( entry, serverlist_viewlist[0] ) ) {
 430                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 431                 return;
 432         } // check whether to insert it as new last item
 433         else if( !_ServerList_Entry_Compare( entry, serverlist_viewlist[serverlist_viewcount - 1] ) ) {
 434                 _ServerList_ViewList_Helper_InsertBefore( serverlist_viewcount, entry );
 435                 return;
 436         }
 437         start = 0;
 438         end = serverlist_viewcount - 1;
 439         while( end > start + 1 )
 440         {
 441                 mid = (start + end) / 2;
 442                 // test the item that lies in the middle between start and end
 443                 if( _ServerList_Entry_Compare( entry, serverlist_viewlist[mid] ) )
 444                         // the item has to be in the upper half
 445                         end = mid;
 446                 else
 447                         // the item has to be in the lower half
 448                         start = mid;
 449         }
 450         _ServerList_ViewList_Helper_InsertBefore( start + 1, entry );
 451 }
 452
 453 static void ServerList_ViewList_Remove( serverlist_entry_t *entry )
 454 {
 455         int i;
 456         for( i = 0; i < serverlist_viewcount; i++ )
 457         {
 458                 if (serverlist_viewlist[i] == entry)
 459                 {
 460                         _ServerList_ViewList_Helper_Remove(i);
 461                         break;
 462                 }
 463         }
 464 }
 465
 466 void ServerList_RebuildViewList(void)
 467 {
 468         int i;
 469
 470         serverlist_viewcount = 0;
 471         for( i = 0 ; i < serverlist_cachecount ; i++ ) {
 472                 serverlist_entry_t *entry = &serverlist_cache[i];
 473                 // also display entries that are currently being refreshed [11/8/2007 Black]
 474                 if( entry->query == SQS_QUERIED || entry->query == SQS_REFRESHING )
 475                         ServerList_ViewList_Insert( entry );
 476         }
 477 }
 478
 479 void ServerList_ResetMasks(void)
 480 {
 481         int i;
 482
 483         memset( &serverlist_andmasks, 0, sizeof( serverlist_andmasks ) );
 484         memset( &serverlist_ormasks, 0, sizeof( serverlist_ormasks ) );
 485         // numbots needs to be compared to -1 to always succeed
 486         for(i = 0; i < SERVERLIST_ANDMASKCOUNT; ++i)
 487                 serverlist_andmasks[i].info.numbots = -1;
 488         for(i = 0; i < SERVERLIST_ORMASKCOUNT; ++i)
 489                 serverlist_ormasks[i].info.numbots = -1;
 490 }
 491
 492 void ServerList_GetPlayerStatistics(int *numplayerspointer, int *maxplayerspointer)
 493 {
 494         int i;
 495         int numplayers = 0, maxplayers = 0;
 496         for (i = 0;i < serverlist_cachecount;i++)
 497         {
 498                 if (serverlist_cache[i].query == SQS_QUERIED)
 499                 {
 500                         numplayers += serverlist_cache[i].info.numhumans;
 501                         maxplayers += serverlist_cache[i].info.maxplayers;
 502                 }
 503         }
 504         *numplayerspointer = numplayers;
 505         *maxplayerspointer = maxplayers;
 506 }
 507
 508 #if 0
 509 static void _ServerList_Test(void)
 510 {
 511         int i;
 512         for( i = 0 ; i < 1024 ; i++ ) {
 513                 memset( &serverlist_cache[serverlist_cachecount], 0, sizeof( serverlist_entry_t ) );
 514                 serverlist_cache[serverlist_cachecount].info.ping = 1000 + 1024 - i;
 515                 dpsnprintf( serverlist_cache[serverlist_cachecount].info.name, sizeof(serverlist_cache[serverlist_cachecount].info.name), "Black's ServerList Test %i", i );
 516                 serverlist_cache[serverlist_cachecount].finished = true;
 517                 dpsnprintf( serverlist_cache[serverlist_cachecount].line1, sizeof(serverlist_cache[serverlist_cachecount].info.line1), "%i %s", serverlist_cache[serverlist_cachecount].info.ping, serverlist_cache[serverlist_cachecount].info.name );
 518                 ServerList_ViewList_Insert( &serverlist_cache[serverlist_cachecount] );
 519                 serverlist_cachecount++;
 520         }
 521 }
 522 #endif
 523
 524 void ServerList_QueryList(qboolean resetcache, qboolean querydp, qboolean queryqw, qboolean consoleoutput)
 525 {
 526         masterquerytime = realtime;
 527         masterquerycount = 0;
 528         masterreplycount = 0;
 529         if( resetcache ) {
 530                 serverquerycount = 0;
 531                 serverreplycount = 0;
 532                 serverlist_cachecount = 0;
 533                 serverlist_viewcount = 0;
 534         } else {
 535                 // refresh all entries
 536                 int n;
 537                 for( n = 0 ; n < serverlist_cachecount ; n++ ) {
 538                         serverlist_entry_t *entry = &serverlist_cache[ n ];
 539                         entry->query = SQS_REFRESHING;
 540                         entry->querycounter = 0;
 541                 }
 542         }
 543         serverlist_consoleoutput = consoleoutput;
 544
 545         //_ServerList_Test();
 546
 547         NetConn_QueryMasters(querydp, queryqw);
 548 }
 549
 550 // rest
 551
 552 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
 553 {
 554         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
 555         int i;
 556         if (length == 0)
 557                 return 0;
 558         if (cl_netpacketloss_receive.integer)
 559                 for (i = 0;i < cl_numsockets;i++)
 560                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss_receive.integer)
 561                                 return 0;
 562         if (developer_networking.integer)
 563         {
 564                 char addressstring[128], addressstring2[128];
 565                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 566                 if (length > 0)
 567                 {
 568                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 569                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", (void *)mysocket, addressstring, (void *)data, maxlength, (void *)peeraddress, length, addressstring2);
 570                         Com_HexDumpToConsole((unsigned char *)data, length);
 571                 }
 572                 else
 573                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", (void *)mysocket, addressstring, (void *)data, maxlength, (void *)peeraddress, length);
 574         }
 575         return length;
 576 }
 577
 578 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 579 {
 580         int ret;
 581         int i;
 582         if (cl_netpacketloss_send.integer)
 583                 for (i = 0;i < cl_numsockets;i++)
 584                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss_send.integer)
 585                                 return length;
 586         ret = LHNET_Write(mysocket, data, length, peeraddress);
 587         if (developer_networking.integer)
 588         {
 589                 char addressstring[128], addressstring2[128];
 590                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 591                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 592                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", (void *)mysocket, addressstring, (void *)data, length, (void *)peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 593                 Com_HexDumpToConsole((unsigned char *)data, length);
 594         }
 595         return ret;
 596 }
 597
 598 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 599 {
 600         // note this does not include the trailing NULL because we add that in the parser
 601         return NetConn_Write(mysocket, string, (int)strlen(string), peeraddress);
 602 }
 603
 604 qboolean NetConn_CanSend(netconn_t *conn)
 605 {
 606         conn->outgoing_packetcounter = (conn->outgoing_packetcounter + 1) % NETGRAPH_PACKETS;
 607         conn->outgoing_netgraph[conn->outgoing_packetcounter].time            = realtime;
 608         conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes = NETGRAPH_NOPACKET;
 609         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
 610         conn->outgoing_netgraph[conn->outgoing_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
 611         if (realtime > conn->cleartime)
 612                 return true;
 613         else
 614         {
 615                 conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes = NETGRAPH_CHOKEDPACKET;
 616                 return false;
 617         }
 618 }
 619
 620 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data, protocolversion_t protocol, int rate, qboolean quakesignon_suppressreliables)
 621 {
 622         int totallen = 0;
 623
 624         // if this packet was supposedly choked, but we find ourselves sending one
 625         // anyway, make sure the size counting starts at zero
 626         // (this mostly happens on level changes and disconnects and such)
 627         if (conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes == NETGRAPH_CHOKEDPACKET)
 628                 conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes = NETGRAPH_NOPACKET;
 629
 630         if (protocol == PROTOCOL_QUAKEWORLD)
 631         {
 632                 int packetLen;
 633                 qboolean sendreliable;
 634
 635                 // note that it is ok to send empty messages to the qw server,
 636                 // otherwise it won't respond to us at all
 637
 638                 sendreliable = false;
 639                 // if the remote side dropped the last reliable message, resend it
 640                 if (conn->qw.incoming_acknowledged > conn->qw.last_reliable_sequence && conn->qw.incoming_reliable_acknowledged != conn->qw.reliable_sequence)
 641                         sendreliable = true;
 642                 // if the reliable transmit buffer is empty, copy the current message out
 643                 if (!conn->sendMessageLength && conn->message.cursize)
 644                 {
 645                         memcpy (conn->sendMessage, conn->message.data, conn->message.cursize);
 646                         conn->sendMessageLength = conn->message.cursize;
 647                         SZ_Clear(&conn->message); // clear the message buffer
 648                         conn->qw.reliable_sequence ^= 1;
 649                         sendreliable = true;
 650                 }
 651                 // outgoing unreliable packet number, and outgoing reliable packet number (0 or 1)
 652                 *((int *)(sendbuffer + 0)) = LittleLong((unsigned int)conn->outgoing_unreliable_sequence | ((unsigned int)sendreliable<<31));
 653                 // last received unreliable packet number, and last received reliable packet number (0 or 1)
 654                 *((int *)(sendbuffer + 4)) = LittleLong((unsigned int)conn->qw.incoming_sequence | ((unsigned int)conn->qw.incoming_reliable_sequence<<31));
 655                 packetLen = 8;
 656                 conn->outgoing_unreliable_sequence++;
 657                 // client sends qport in every packet
 658                 if (conn == cls.netcon)
 659                 {
 660                         *((short *)(sendbuffer + 8)) = LittleShort(cls.qw_qport);
 661                         packetLen += 2;
 662                         // also update cls.qw_outgoing_sequence
 663                         cls.qw_outgoing_sequence = conn->outgoing_unreliable_sequence;
 664                 }
 665                 if (packetLen + (sendreliable ? conn->sendMessageLength : 0) > 1400)
 666                 {
 667                         Con_Printf ("NetConn_SendUnreliableMessage: reliable message too big %u\n", data->cursize);
 668                         return -1;
 669                 }
 670
 671                 conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes += packetLen + 28;
 672
 673                 // add the reliable message if there is one
 674                 if (sendreliable)
 675                 {
 676                         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes += conn->sendMessageLength + 28;
 677                         memcpy(sendbuffer + packetLen, conn->sendMessage, conn->sendMessageLength);
 678                         packetLen += conn->sendMessageLength;
 679                         conn->qw.last_reliable_sequence = conn->outgoing_unreliable_sequence;
 680                 }
 681
 682                 // add the unreliable message if possible
 683                 if (packetLen + data->cursize <= 1400)
 684                 {
 685                         conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes += data->cursize + 28;
 686                         memcpy(sendbuffer + packetLen, data->data, data->cursize);
 687                         packetLen += data->cursize;
 688                 }
 689
 690                 NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
 691
 692                 packetsSent++;
 693                 unreliableMessagesSent++;
 694
 695                 totallen += packetLen + 28;
 696         }
 697         else
 698         {
 699                 unsigned int packetLen;
 700                 unsigned int dataLen;
 701                 unsigned int eom;
 702                 unsigned int *header;
 703
 704                 // if a reliable message fragment has been lost, send it again
 705                 if (conn->sendMessageLength && (realtime - conn->lastSendTime) > 1.0)
 706                 {
 707                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 708                         {
 709                                 dataLen = conn->sendMessageLength;
 710                                 eom = NETFLAG_EOM;
 711                         }
 712                         else
 713                         {
 714                                 dataLen = MAX_PACKETFRAGMENT;
 715                                 eom = 0;
 716                         }
 717
 718                         packetLen = NET_HEADERSIZE + dataLen;
 719
 720                         header = (unsigned int *)sendbuffer;
 721                         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 722                         header[1] = BigLong(conn->nq.sendSequence - 1);
 723                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 724
 725                         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes += packetLen + 28;
 726
 727                         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) == (int)packetLen)
 728                         {
 729                                 conn->lastSendTime = realtime;
 730                                 packetsReSent++;
 731                         }
 732
 733                         totallen += packetLen + 28;
 734                 }
 735
 736                 // if we have a new reliable message to send, do so
 737                 if (!conn->sendMessageLength && conn->message.cursize && !quakesignon_suppressreliables)
 738                 {
 739                         if (conn->message.cursize > (int)sizeof(conn->sendMessage))
 740                         {
 741                                 Con_Printf("NetConn_SendUnreliableMessage: reliable message too big (%u > %u)\n", conn->message.cursize, (int)sizeof(conn->sendMessage));
 742                                 conn->message.overflowed = true;
 743                                 return -1;
 744                         }
 745
 746                         if (developer_networking.integer && conn == cls.netcon)
 747                         {
 748                                 Con_Print("client sending reliable message to server:\n");
 749                                 SZ_HexDumpToConsole(&conn->message);
 750                         }
 751
 752                         memcpy(conn->sendMessage, conn->message.data, conn->message.cursize);
 753                         conn->sendMessageLength = conn->message.cursize;
 754                         SZ_Clear(&conn->message);
 755
 756                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 757                         {
 758                                 dataLen = conn->sendMessageLength;
 759                                 eom = NETFLAG_EOM;
 760                         }
 761                         else
 762                         {
 763                                 dataLen = MAX_PACKETFRAGMENT;
 764                                 eom = 0;
 765                         }
 766
 767                         packetLen = NET_HEADERSIZE + dataLen;
 768
 769                         header = (unsigned int *)sendbuffer;
 770                         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 771                         header[1] = BigLong(conn->nq.sendSequence);
 772                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 773
 774                         conn->nq.sendSequence++;
 775
 776                         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes += packetLen + 28;
 777
 778                         NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
 779
 780                         conn->lastSendTime = realtime;
 781                         packetsSent++;
 782                         reliableMessagesSent++;
 783
 784                         totallen += packetLen + 28;
 785                 }
 786
 787                 // if we have an unreliable message to send, do so
 788                 if (data->cursize)
 789                 {
 790                         packetLen = NET_HEADERSIZE + data->cursize;
 791
 792                         if (packetLen > (int)sizeof(sendbuffer))
 793                         {
 794                                 Con_Printf("NetConn_SendUnreliableMessage: message too big %u\n", data->cursize);
 795                                 return -1;
 796                         }
 797
 798                         header = (unsigned int *)sendbuffer;
 799                         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
 800                         header[1] = BigLong(conn->outgoing_unreliable_sequence);
 801                         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
 802
 803                         conn->outgoing_unreliable_sequence++;
 804
 805                         conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes += packetLen + 28;
 806
 807                         NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
 808
 809                         packetsSent++;
 810                         unreliableMessagesSent++;
 811
 812                         totallen += packetLen + 28;
 813                 }
 814         }
 815
 816         // delay later packets to obey rate limit
 817         if (conn->cleartime < realtime - 0.1)
 818                 conn->cleartime = realtime - 0.1;
 819         conn->cleartime = conn->cleartime + (double)totallen / (double)rate;
 820         if (conn->cleartime < realtime)
 821                 conn->cleartime = realtime;
 822
 823         return 0;
 824 }
 825
 826 qboolean NetConn_HaveClientPorts(void)
 827 {
 828         return !!cl_numsockets;
 829 }
 830
 831 qboolean NetConn_HaveServerPorts(void)
 832 {
 833         return !!sv_numsockets;
 834 }
 835
 836 void NetConn_CloseClientPorts(void)
 837 {
 838         for (;cl_numsockets > 0;cl_numsockets--)
 839                 if (cl_sockets[cl_numsockets - 1])
 840                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 841 }
 842
 843 void NetConn_OpenClientPort(const char *addressstring, lhnetaddresstype_t addresstype, int defaultport)
 844 {
 845         lhnetaddress_t address;
 846         lhnetsocket_t *s;
 847         int success;
 848         char addressstring2[1024];
 849         if (addressstring && addressstring[0])
 850                 success = LHNETADDRESS_FromString(&address, addressstring, defaultport);
 851         else
 852                 success = LHNETADDRESS_FromPort(&address, addresstype, defaultport);
 853         if (success)
 854         {
 855                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 856                 {
 857                         cl_sockets[cl_numsockets++] = s;
 858                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 859                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
 860                 }
 861                 else
 862                 {
 863                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 864                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
 865                 }
 866         }
 867         else
 868                 Con_Printf("Client unable to parse address %s\n", addressstring);
 869 }
 870
 871 void NetConn_OpenClientPorts(void)
 872 {
 873         int port;
 874         NetConn_CloseClientPorts();
 875         port = bound(0, cl_netport.integer, 65535);
 876         if (cl_netport.integer != port)
 877                 Cvar_SetValueQuick(&cl_netport, port);
 878         if(port == 0)
 879                 Con_Printf("Client using an automatically assigned port\n");
 880         else
 881                 Con_Printf("Client using port %i\n", port);
 882         NetConn_OpenClientPort(NULL, LHNETADDRESSTYPE_LOOP, 2);
 883         NetConn_OpenClientPort(net_address.string, LHNETADDRESSTYPE_INET4, port);
 884         NetConn_OpenClientPort(net_address_ipv6.string, LHNETADDRESSTYPE_INET6, port);
 885 }
 886
 887 void NetConn_CloseServerPorts(void)
 888 {
 889         for (;sv_numsockets > 0;sv_numsockets--)
 890                 if (sv_sockets[sv_numsockets - 1])
 891                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 892 }
 893
 894 qboolean NetConn_OpenServerPort(const char *addressstring, lhnetaddresstype_t addresstype, int defaultport, int range)
 895 {
 896         lhnetaddress_t address;
 897         lhnetsocket_t *s;
 898         int port;
 899         char addressstring2[1024];
 900         int success;
 901
 902         for (port = defaultport; port <= defaultport + range; port++)
 903         {
 904                 if (addressstring && addressstring[0])
 905                         success = LHNETADDRESS_FromString(&address, addressstring, port);
 906                 else
 907                         success = LHNETADDRESS_FromPort(&address, addresstype, port);
 908                 if (success)
 909                 {
 910                         if ((s = LHNET_OpenSocket_Connectionless(&address)))
 911                         {
 912                                 sv_sockets[sv_numsockets++] = s;
 913                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 914                                 Con_Printf("Server listening on address %s\n", addressstring2);
 915                                 return true;
 916                         }
 917                         else
 918                         {
 919                                 LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 920                                 Con_Printf("Server failed to open socket on address %s\n", addressstring2);
 921                         }
 922                 }
 923                 else
 924                 {
 925                         Con_Printf("Server unable to parse address %s\n", addressstring);
 926                         // if it cant parse one address, it wont be able to parse another for sure
 927                         return false;
 928                 }
 929         }
 930         return false;
 931 }
 932
 933 void NetConn_OpenServerPorts(int opennetports)
 934 {
 935         int port;
 936         NetConn_CloseServerPorts();
 937         NetConn_UpdateSockets();
 938         port = bound(0, sv_netport.integer, 65535);
 939         if (port == 0)
 940                 port = 26000;
 941         Con_Printf("Server using port %i\n", port);
 942         if (sv_netport.integer != port)
 943                 Cvar_SetValueQuick(&sv_netport, port);
 944         if (cls.state != ca_dedicated)
 945                 NetConn_OpenServerPort(NULL, LHNETADDRESSTYPE_LOOP, 1, 1);
 946         if (opennetports)
 947         {
 948                 qboolean ip4success = NetConn_OpenServerPort(net_address.string, LHNETADDRESSTYPE_INET4, port, 100);
 949                 NetConn_OpenServerPort(net_address_ipv6.string, LHNETADDRESSTYPE_INET6, port, ip4success ? 1 : 100);
 950         }
 951         if (sv_numsockets == 0)
 952                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!");
 953 }
 954
 955 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 956 {
 957         int i, a = LHNETADDRESS_GetAddressType(address);
 958         for (i = 0;i < cl_numsockets;i++)
 959                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 960                         return cl_sockets[i];
 961         return NULL;
 962 }
 963
 964 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 965 {
 966         int i, a = LHNETADDRESS_GetAddressType(address);
 967         for (i = 0;i < sv_numsockets;i++)
 968                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 969                         return sv_sockets[i];
 970         return NULL;
 971 }
 972
 973 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 974 {
 975         netconn_t *conn;
 976         conn = (netconn_t *)Mem_Alloc(netconn_mempool, sizeof(*conn));
 977         conn->mysocket = mysocket;
 978         conn->peeraddress = *peeraddress;
 979         conn->lastMessageTime = realtime;
 980         conn->message.data = conn->messagedata;
 981         conn->message.maxsize = sizeof(conn->messagedata);
 982         conn->message.cursize = 0;
 983         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
 984         // reduce effectiveness of connection request floods
 985         conn->timeout = realtime + net_connecttimeout.value;
 986         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
 987         conn->next = netconn_list;
 988         netconn_list = conn;
 989         return conn;
 990 }
 991
 992 void NetConn_ClearConnectFlood(lhnetaddress_t *peeraddress);
 993 void NetConn_Close(netconn_t *conn)
 994 {
 995         netconn_t *c;
 996         // remove connection from list
 997
 998         // allow the client to reconnect immediately
 999         NetConn_ClearConnectFlood(&(conn->peeraddress));
1000
1001         if (conn == netconn_list)
1002                 netconn_list = conn->next;
1003         else
1004         {
1005                 for (c = netconn_list;c;c = c->next)
1006                 {
1007                         if (c->next == conn)
1008                         {
1009                                 c->next = conn->next;
1010                                 break;
1011                         }
1012                 }
1013                 // not found in list, we'll avoid crashing here...
1014                 if (!c)
1015                         return;
1016         }
1017         // free connection
1018         Mem_Free(conn);
1019 }
1020
1021 static int clientport = -1;
1022 static int clientport2 = -1;
1023 static int hostport = -1;
1024 void NetConn_UpdateSockets(void)
1025 {
1026         int i, j;
1027
1028         if (cls.state != ca_dedicated)
1029         {
1030                 if (clientport2 != cl_netport.integer)
1031                 {
1032                         clientport2 = cl_netport.integer;
1033                         if (cls.state == ca_connected)
1034                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
1035                 }
1036                 if (cls.state == ca_disconnected && clientport != clientport2)
1037                 {
1038                         clientport = clientport2;
1039                         NetConn_CloseClientPorts();
1040                 }
1041                 if (cl_numsockets == 0)
1042                         NetConn_OpenClientPorts();
1043         }
1044
1045         if (hostport != sv_netport.integer)
1046         {
1047                 hostport = sv_netport.integer;
1048                 if (sv.active)
1049                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
1050         }
1051
1052         for (j = 0;j < MAX_RCONS;j++)
1053         {
1054                 i = (cls.rcon_ringpos + j + 1) % MAX_RCONS;
1055                 if(cls.rcon_commands[i][0])
1056                 {
1057                         if(realtime > cls.rcon_timeout[i])
1058                         {
1059                                 char s[128];
1060                                 LHNETADDRESS_ToString(&cls.rcon_addresses[i], s, sizeof(s), true);
1061                                 Con_Printf("rcon to %s (for command %s) failed: challenge request timed out\n", s, cls.rcon_commands[i]);
1062                                 cls.rcon_commands[i][0] = 0;
1063                                 --cls.rcon_trying;
1064                                 break;
1065                         }
1066                 }
1067         }
1068 }
1069
1070 static int NetConn_ReceivedMessage(netconn_t *conn, unsigned char *data, int length, protocolversion_t protocol, double newtimeout)
1071 {
1072         int originallength = length;
1073         if (length < 8)
1074                 return 0;
1075
1076         if (protocol == PROTOCOL_QUAKEWORLD)
1077         {
1078                 int sequence, sequence_ack;
1079                 int reliable_ack, reliable_message;
1080                 int count;
1081                 int qport;
1082
1083                 sequence = LittleLong(*((int *)(data + 0)));
1084                 sequence_ack = LittleLong(*((int *)(data + 4)));
1085                 data += 8;
1086                 length -= 8;
1087
1088                 if (conn != cls.netcon)
1089                 {
1090                         // server only
1091                         if (length < 2)
1092                                 return 0;
1093                         // 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?)
1094                         qport = LittleShort(*((int *)(data + 8)));
1095                         data += 2;
1096                         length -= 2;
1097                 }
1098
1099                 packetsReceived++;
1100                 reliable_message = (sequence >> 31) & 1;
1101                 reliable_ack = (sequence_ack >> 31) & 1;
1102                 sequence &= ~(1<<31);
1103                 sequence_ack &= ~(1<<31);
1104                 if (sequence <= conn->qw.incoming_sequence)
1105                 {
1106                         //Con_DPrint("Got a stale datagram\n");
1107                         return 0;
1108                 }
1109                 count = sequence - (conn->qw.incoming_sequence + 1);
1110                 if (count > 0)
1111                 {
1112                         droppedDatagrams += count;
1113                         //Con_DPrintf("Dropped %u datagram(s)\n", count);
1114                         while (count--)
1115                         {
1116                                 conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1117                                 conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1118                                 conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = NETGRAPH_LOSTPACKET;
1119                                 conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1120                                 conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1121                         }
1122                 }
1123                 conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1124                 conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1125                 conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = originallength + 28;
1126                 conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1127                 conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1128                 if (reliable_ack == conn->qw.reliable_sequence)
1129                 {
1130                         // received, now we will be able to send another reliable message
1131                         conn->sendMessageLength = 0;
1132                         reliableMessagesReceived++;
1133                 }
1134                 conn->qw.incoming_sequence = sequence;
1135                 if (conn == cls.netcon)
1136                         cls.qw_incoming_sequence = conn->qw.incoming_sequence;
1137                 conn->qw.incoming_acknowledged = sequence_ack;
1138                 conn->qw.incoming_reliable_acknowledged = reliable_ack;
1139                 if (reliable_message)
1140                         conn->qw.incoming_reliable_sequence ^= 1;
1141                 conn->lastMessageTime = realtime;
1142                 conn->timeout = realtime + newtimeout;
1143                 unreliableMessagesReceived++;
1144                 SZ_Clear(&net_message);
1145                 SZ_Write(&net_message, data, length);
1146                 MSG_BeginReading();
1147                 return 2;
1148         }
1149         else
1150         {
1151                 unsigned int count;
1152                 unsigned int flags;
1153                 unsigned int sequence;
1154                 int qlength;
1155
1156                 qlength = (unsigned int)BigLong(((int *)data)[0]);
1157                 flags = qlength & ~NETFLAG_LENGTH_MASK;
1158                 qlength &= NETFLAG_LENGTH_MASK;
1159                 // control packets were already handled
1160                 if (!(flags & NETFLAG_CTL) && qlength == length)
1161                 {
1162                         sequence = BigLong(((int *)data)[1]);
1163                         packetsReceived++;
1164                         data += 8;
1165                         length -= 8;
1166                         if (flags & NETFLAG_UNRELIABLE)
1167                         {
1168                                 if (sequence >= conn->nq.unreliableReceiveSequence)
1169                                 {
1170                                         if (sequence > conn->nq.unreliableReceiveSequence)
1171                                         {
1172                                                 count = sequence - conn->nq.unreliableReceiveSequence;
1173                                                 droppedDatagrams += count;
1174                                                 //Con_DPrintf("Dropped %u datagram(s)\n", count);
1175                                                 while (count--)
1176                                                 {
1177                                                         conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1178                                                         conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1179                                                         conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = NETGRAPH_LOSTPACKET;
1180                                                         conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1181                                                         conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1182                                                 }
1183                                         }
1184                                         conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1185                                         conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1186                                         conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = originallength + 28;
1187                                         conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1188                                         conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1189                                         conn->nq.unreliableReceiveSequence = sequence + 1;
1190                                         conn->lastMessageTime = realtime;
1191                                         conn->timeout = realtime + newtimeout;
1192                                         unreliableMessagesReceived++;
1193                                         if (length > 0)
1194                                         {
1195                                                 SZ_Clear(&net_message);
1196                                                 SZ_Write(&net_message, data, length);
1197                                                 MSG_BeginReading();
1198                                                 return 2;
1199                                         }
1200                                 }
1201                                 //else
1202                                 //      Con_DPrint("Got a stale datagram\n");
1203                                 return 1;
1204                         }
1205                         else if (flags & NETFLAG_ACK)
1206                         {
1207                                 conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes += originallength + 28;
1208                                 if (sequence == (conn->nq.sendSequence - 1))
1209                                 {
1210                                         if (sequence == conn->nq.ackSequence)
1211                                         {
1212                                                 conn->nq.ackSequence++;
1213                                                 if (conn->nq.ackSequence != conn->nq.sendSequence)
1214                                                         Con_DPrint("ack sequencing error\n");
1215                                                 conn->lastMessageTime = realtime;
1216                                                 conn->timeout = realtime + newtimeout;
1217                                                 if (conn->sendMessageLength > MAX_PACKETFRAGMENT)
1218                                                 {
1219                                                         unsigned int packetLen;
1220                                                         unsigned int dataLen;
1221                                                         unsigned int eom;
1222                                                         unsigned int *header;
1223
1224                                                         conn->sendMessageLength -= MAX_PACKETFRAGMENT;
1225                                                         memmove(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
1226
1227                                                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
1228                                                         {
1229                                                                 dataLen = conn->sendMessageLength;
1230                                                                 eom = NETFLAG_EOM;
1231                                                         }
1232                                                         else
1233                                                         {
1234                                                                 dataLen = MAX_PACKETFRAGMENT;
1235                                                                 eom = 0;
1236                                                         }
1237
1238                                                         packetLen = NET_HEADERSIZE + dataLen;
1239
1240                                                         header = (unsigned int *)sendbuffer;
1241                                                         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
1242                                                         header[1] = BigLong(conn->nq.sendSequence);
1243                                                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
1244
1245                                                         conn->nq.sendSequence++;
1246
1247                                                         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) == (int)packetLen)
1248                                                         {
1249                                                                 conn->lastSendTime = realtime;
1250                                                                 packetsSent++;
1251                                                         }
1252                                                 }
1253                                                 else
1254                                                         conn->sendMessageLength = 0;
1255                                         }
1256                                         //else
1257                                         //      Con_DPrint("Duplicate ACK received\n");
1258                                 }
1259                                 //else
1260                                 //      Con_DPrint("Stale ACK received\n");
1261                                 return 1;
1262                         }
1263                         else if (flags & NETFLAG_DATA)
1264                         {
1265                                 unsigned int temppacket[2];
1266                                 conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   += originallength + 28;
1267                                 conn->outgoing_netgraph[conn->outgoing_packetcounter].ackbytes        += 8 + 28;
1268                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
1269                                 temppacket[1] = BigLong(sequence);
1270                                 NetConn_Write(conn->mysocket, (unsigned char *)temppacket, 8, &conn->peeraddress);
1271                                 if (sequence == conn->nq.receiveSequence)
1272                                 {
1273                                         conn->lastMessageTime = realtime;
1274                                         conn->timeout = realtime + newtimeout;
1275                                         conn->nq.receiveSequence++;
1276                                         if( conn->receiveMessageLength + length <= (int)sizeof( conn->receiveMessage ) ) {
1277                                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
1278                                                 conn->receiveMessageLength += length;
1279                                         } else {
1280                                                 Con_Printf( "Reliable message (seq: %i) too big for message buffer!\n"
1281                                                                         "Dropping the message!\n", sequence );
1282                                                 conn->receiveMessageLength = 0;
1283                                                 return 1;
1284                                         }
1285                                         if (flags & NETFLAG_EOM)
1286                                         {
1287                                                 reliableMessagesReceived++;
1288                                                 length = conn->receiveMessageLength;
1289                                                 conn->receiveMessageLength = 0;
1290                                                 if (length > 0)
1291                                                 {
1292                                                         SZ_Clear(&net_message);
1293                                                         SZ_Write(&net_message, conn->receiveMessage, length);
1294                                                         MSG_BeginReading();
1295                                                         return 2;
1296                                                 }
1297                                         }
1298                                 }
1299                                 else
1300                                         receivedDuplicateCount++;
1301                                 return 1;
1302                         }
1303                 }
1304         }
1305         return 0;
1306 }
1307
1308 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress, protocolversion_t initialprotocol)
1309 {
1310         cls.connect_trying = false;
1311         M_Update_Return_Reason("");
1312         // the connection request succeeded, stop current connection and set up a new connection
1313         CL_Disconnect();
1314         // if we're connecting to a remote server, shut down any local server
1315         if (LHNETADDRESS_GetAddressType(peeraddress) != LHNETADDRESSTYPE_LOOP && sv.active)
1316                 Host_ShutdownServer ();
1317         // allocate a net connection to keep track of things
1318         cls.netcon = NetConn_Open(mysocket, peeraddress);
1319         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
1320         key_dest = key_game;
1321         m_state = m_none;
1322         cls.demonum = -1;                       // not in the demo loop now
1323         cls.state = ca_connected;
1324         cls.signon = 0;                         // need all the signon messages before playing
1325         cls.protocol = initialprotocol;
1326         // reset move sequence numbering on this new connection
1327         cls.servermovesequence = 0;
1328         if (cls.protocol == PROTOCOL_QUAKEWORLD)
1329                 Cmd_ForwardStringToServer("new");
1330         if (cls.protocol == PROTOCOL_QUAKE)
1331         {
1332                 // write a keepalive (clc_nop) as it seems to greatly improve the
1333                 // chances of connecting to a netquake server
1334                 sizebuf_t msg;
1335                 unsigned char buf[4];
1336                 memset(&msg, 0, sizeof(msg));
1337                 msg.data = buf;
1338                 msg.maxsize = sizeof(buf);
1339                 MSG_WriteChar(&msg, clc_nop);
1340                 NetConn_SendUnreliableMessage(cls.netcon, &msg, cls.protocol, 10000, false);
1341         }
1342 }
1343
1344 int NetConn_IsLocalGame(void)
1345 {
1346         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
1347                 return true;
1348         return false;
1349 }
1350
1351 static int NetConn_ClientParsePacket_ServerList_ProcessReply(const char *addressstring)
1352 {
1353         int n;
1354         int pingtime;
1355         serverlist_entry_t *entry = NULL;
1356
1357         // search the cache for this server and update it
1358         for (n = 0;n < serverlist_cachecount;n++) {
1359                 entry = &serverlist_cache[ n ];
1360                 if (!strcmp(addressstring, entry->info.cname))
1361                         break;
1362         }
1363
1364         if (n == serverlist_cachecount)
1365         {
1366                 // LAN search doesnt require an answer from the master server so we wont
1367                 // know the ping nor will it be initialized already...
1368
1369                 // find a slot
1370                 if (serverlist_cachecount == SERVERLIST_TOTALSIZE)
1371                         return -1;
1372
1373                 entry = &serverlist_cache[n];
1374
1375                 memset(entry, 0, sizeof(*entry));
1376                 // store the data the engine cares about (address and ping)
1377                 strlcpy(entry->info.cname, addressstring, sizeof(entry->info.cname));
1378                 entry->info.ping = 100000;
1379                 entry->querytime = realtime;
1380                 // if not in the slist menu we should print the server to console
1381                 if (serverlist_consoleoutput)
1382                         Con_Printf("querying %s\n", addressstring);
1383                 ++serverlist_cachecount;
1384         }
1385         // if this is the first reply from this server, count it as having replied
1386         pingtime = (int)((realtime - entry->querytime) * 1000.0 + 0.5);
1387         pingtime = bound(0, pingtime, 9999);
1388         if (entry->query == SQS_REFRESHING) {
1389                 entry->info.ping = pingtime;
1390                 entry->query = SQS_QUERIED;
1391         } else {
1392                 // convert to unsigned to catch the -1
1393                 // I still dont like this but its better than the old 10000 magic ping number - as in easier to type and read :( [11/8/2007 Black]
1394                 entry->info.ping = min((unsigned) entry->info.ping, (unsigned) pingtime);
1395                 serverreplycount++;
1396         }
1397
1398         // other server info is updated by the caller
1399         return n;
1400 }
1401
1402 static void NetConn_ClientParsePacket_ServerList_UpdateCache(int n)
1403 {
1404         serverlist_entry_t *entry = &serverlist_cache[n];
1405         serverlist_info_t *info = &entry->info;
1406         // update description strings for engine menu and console output
1407         dpsnprintf(entry->line1, sizeof(serverlist_cache[n].line1), "^%c%5d^7 ^%c%3u^7/%3u %-65.65s", info->ping >= 300 ? '1' : (info->ping >= 200 ? '3' : '7'), (int)info->ping, ((info->numhumans > 0 && info->numhumans < info->maxplayers) ? (info->numhumans >= 4 ? '7' : '3') : '1'), info->numplayers, info->maxplayers, info->name);
1408         dpsnprintf(entry->line2, sizeof(serverlist_cache[n].line2), "^4%-21.21s %-19.19s ^%c%-17.17s^4 %-20.20s", info->cname, info->game,
1409                         (
1410                          info->gameversion != gameversion.integer
1411                          &&
1412                          !(
1413                                     gameversion_min.integer >= 0 // min/max range set by user/mod?
1414                                  && gameversion_max.integer >= 0
1415                                  && gameversion_min.integer >= info->gameversion // version of server in min/max range?
1416                                  && gameversion_max.integer <= info->gameversion
1417                           )
1418                         ) ? '1' : '4',
1419                         info->mod, info->map);
1420         if (entry->query == SQS_QUERIED)
1421         {
1422                 if(!serverlist_paused)
1423                         ServerList_ViewList_Remove(entry);
1424         }
1425         // if not in the slist menu we should print the server to console (if wanted)
1426         else if( serverlist_consoleoutput )
1427                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1428         // and finally, update the view set
1429         if(!serverlist_paused)
1430                 ServerList_ViewList_Insert( entry );
1431         //      update the entry's state
1432         serverlist_cache[n].query = SQS_QUERIED;
1433 }
1434
1435 // returns true, if it's sensible to continue the processing
1436 static qboolean NetConn_ClientParsePacket_ServerList_PrepareQuery( int protocol, const char *ipstring, qboolean isfavorite ) {
1437         int n;
1438         serverlist_entry_t *entry;
1439
1440         //      ignore the rest of the message if the serverlist is full
1441         if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1442                 return false;
1443         //      also ignore     it      if      we      have already queried    it      (other master server    response)
1444         for( n =        0 ; n   < serverlist_cachecount ; n++   )
1445                 if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1446                         break;
1447
1448         entry = &serverlist_cache[n];
1449
1450         if( n < serverlist_cachecount ) {
1451                 // the entry has already been queried once or
1452                 return true;
1453         }
1454
1455         memset(entry, 0, sizeof(entry));
1456         entry->protocol =       protocol;
1457         //      store   the data        the engine cares about (address and     ping)
1458         strlcpy (entry->info.cname, ipstring, sizeof(entry->info.cname));
1459
1460         entry->info.isfavorite = isfavorite;
1461
1462         // no, then reset the ping right away
1463         entry->info.ping = -1;
1464         // we also want to increase the serverlist_cachecount then
1465         serverlist_cachecount++;
1466         serverquerycount++;
1467
1468         entry->query =  SQS_QUERYING;
1469
1470         return true;
1471 }
1472
1473 static void NetConn_ClientParsePacket_ServerList_ParseDPList(lhnetaddress_t *senderaddress, const unsigned char *data, int length, qboolean isextended)
1474 {
1475         masterreplycount++;
1476         if (serverlist_consoleoutput)
1477                 Con_Printf("received DarkPlaces %sserver list...\n", isextended ? "extended " : "");
1478         while (length >= 7)
1479         {
1480                 char ipstring [128];
1481
1482                 // IPv4 address
1483                 if (data[0] == '\\')
1484                 {
1485                         unsigned short port = data[5] * 256 + data[6];
1486
1487                         if (port != 0 && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF))
1488                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%hu", data[1], data[2], data[3], data[4], port);
1489
1490                         // move on to next address in packet
1491                         data += 7;
1492                         length -= 7;
1493                 }
1494                 // IPv6 address
1495                 else if (data[0] == '/' && isextended && length >= 19)
1496                 {
1497                         unsigned short port = data[17] * 256 + data[18];
1498
1499                         if (port != 0)
1500                         {
1501                                 const char *ifname;
1502
1503                                 /// \TODO: make some basic checks of the IP address (broadcast, ...)
1504
1505                                 ifname = LHNETADDRESS_GetInterfaceName(senderaddress);
1506                                 if (ifname != NULL)
1507                                 {
1508                                         dpsnprintf (ipstring, sizeof (ipstring), "[%x%02x:%x%02x:%x%02x:%x%02x:%x%02x:%x%02x:%x%02x:%x%02x%%%s]:%hu",
1509                                                                 data[1], data[2], data[3], data[4], data[5], data[6], data[7], data[8],
1510                                                                 data[9], data[10], data[11], data[12], data[13], data[14], data[15], data[16],
1511                                                                 ifname, port);
1512                                 }
1513                                 else
1514                                 {
1515                                         dpsnprintf (ipstring, sizeof (ipstring), "[%x%02x:%x%02x:%x%02x:%x%02x:%x%02x:%x%02x:%x%02x:%x%02x]:%hu",
1516                                                                 data[1], data[2], data[3], data[4], data[5], data[6], data[7], data[8],
1517                                                                 data[9], data[10], data[11], data[12], data[13], data[14], data[15], data[16],
1518                                                                 port);
1519                                 }
1520                         }
1521
1522                         // move on to next address in packet
1523                         data += 19;
1524                         length -= 19;
1525                 }
1526                 else
1527                 {
1528                         Con_Print("Error while parsing the server list\n");
1529                         break;
1530                 }
1531
1532                 if (serverlist_consoleoutput && developer_networking.integer)
1533                         Con_Printf("Requesting info from DarkPlaces server %s\n", ipstring);
1534
1535                 if( !NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_DARKPLACES7, ipstring, false ) ) {
1536                         break;
1537                 }
1538
1539         }
1540
1541         // begin or resume serverlist queries
1542         serverlist_querysleep = false;
1543         serverlist_querywaittime = realtime + 3;
1544 }
1545
1546 static int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1547 {
1548         qboolean fromserver;
1549         int ret, c, control;
1550         const char *s;
1551         char *string, addressstring2[128], ipstring[32];
1552         char stringbuf[16384];
1553
1554         // quakeworld ingame packet
1555         fromserver = cls.netcon && mysocket == cls.netcon->mysocket && !LHNETADDRESS_Compare(&cls.netcon->peeraddress, peeraddress);
1556
1557         // convert the address to a string incase we need it
1558         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1559
1560         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1561         {
1562                 // received a command string - strip off the packaging and put it
1563                 // into our string buffer with NULL termination
1564                 data += 4;
1565                 length -= 4;
1566                 length = min(length, (int)sizeof(stringbuf) - 1);
1567                 memcpy(stringbuf, data, length);
1568                 stringbuf[length] = 0;
1569                 string = stringbuf;
1570
1571                 if (developer_networking.integer)
1572                 {
1573                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
1574                         Com_HexDumpToConsole(data, length);
1575                 }
1576
1577                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.rcon_trying)
1578                 {
1579                         int i, j;
1580                         for (j = 0;j < MAX_RCONS;j++)
1581                         {
1582                                 i = (cls.rcon_ringpos + j) % MAX_RCONS;
1583                                 if(cls.rcon_commands[i][0])
1584                                         if (!LHNETADDRESS_Compare(peeraddress, &cls.rcon_addresses[i]))
1585                                                 break;
1586                         }
1587                         if (j < MAX_RCONS)
1588                         {
1589                                 char buf[1500];
1590                                 char argbuf[1500];
1591                                 dpsnprintf(argbuf, sizeof(argbuf), "%s %s", string + 10, cls.rcon_commands[i]);
1592                                 memcpy(buf, "\377\377\377\377srcon HMAC-MD4 CHALLENGE ", 29);
1593                                 if(HMAC_MDFOUR_16BYTES((unsigned char *) (buf + 29), (unsigned char *) argbuf, strlen(argbuf), (unsigned char *) rcon_password.string, strlen(rcon_password.string)))
1594                                 {
1595                                         buf[45] = ' ';
1596                                         strlcpy(buf + 46, argbuf, sizeof(buf) - 46);
1597                                         NetConn_Write(mysocket, buf, 46 + strlen(buf + 46), peeraddress);
1598                                         cls.rcon_commands[i][0] = 0;
1599                                         --cls.rcon_trying;
1600
1601                                         for (i = 0;i < MAX_RCONS;i++)
1602                                                 if(cls.rcon_commands[i][0])
1603                                                         if (!LHNETADDRESS_Compare(peeraddress, &cls.rcon_addresses[i]))
1604                                                                 break;
1605                                         if(i < MAX_RCONS)
1606                                         {
1607                                                 NetConn_WriteString(mysocket, "\377\377\377\377getchallenge", peeraddress);
1608                                                 // extend the timeout on other requests as we asked for a challenge
1609                                                 for (i = 0;i < MAX_RCONS;i++)
1610                                                         if(cls.rcon_commands[i][0])
1611                                                                 if (!LHNETADDRESS_Compare(peeraddress, &cls.rcon_addresses[i]))
1612                                                                         cls.rcon_timeout[i] = realtime + rcon_secure_challengetimeout.value;
1613                                         }
1614
1615                                         return true; // we used up the challenge, so we can't use this oen for connecting now anyway
1616                                 }
1617                         }
1618                 }
1619                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
1620                 {
1621                         // darkplaces or quake3
1622                         char protocolnames[1400];
1623                         Protocol_Names(protocolnames, sizeof(protocolnames));
1624                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
1625                         M_Update_Return_Reason("Got challenge response");
1626                         // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1627                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1628                         // TODO: add userinfo stuff here instead of using NQ commands?
1629                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\protocols\\%s\\challenge\\%s", protocolnames, string + 10), peeraddress);
1630                         return true;
1631                 }
1632                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
1633                 {
1634                         // darkplaces or quake3
1635                         M_Update_Return_Reason("Accepted");
1636                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_DARKPLACES3);
1637                         return true;
1638                 }
1639                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
1640                 {
1641                         char rejectreason[32];
1642                         cls.connect_trying = false;
1643                         string += 7;
1644                         length = min(length - 7, (int)sizeof(rejectreason) - 1);
1645                         memcpy(rejectreason, string, length);
1646                         rejectreason[length] = 0;
1647                         M_Update_Return_Reason(rejectreason);
1648                         return true;
1649                 }
1650                 if (length >= 15 && !memcmp(string, "statusResponse\x0A", 15))
1651                 {
1652                         serverlist_info_t *info;
1653                         char *p;
1654                         int n;
1655
1656                         string += 15;
1657                         // search the cache for this server and update it
1658                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1659                         if (n < 0)
1660                                 return true;
1661
1662                         info = &serverlist_cache[n].info;
1663                         info->game[0] = 0;
1664                         info->mod[0]  = 0;
1665                         info->map[0]  = 0;
1666                         info->name[0] = 0;
1667                         info->qcstatus[0] = 0;
1668                         info->players[0] = 0;
1669                         info->protocol = -1;
1670                         info->numplayers = 0;
1671                         info->numbots = -1;
1672                         info->maxplayers  = 0;
1673                         info->gameversion = 0;
1674
1675                         p = strchr(string, '\n');
1676                         if(p)
1677                         {
1678                                 *p = 0; // cut off the string there
1679                                 ++p;
1680                         }
1681                         else
1682                                 Con_Printf("statusResponse without players block?\n");
1683
1684                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));
1685                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));
1686                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));
1687                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));
1688                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);
1689                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);
1690                         if ((s = SearchInfostring(string, "bots"         )) != NULL) info->numbots = atoi(s);
1691                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);
1692                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);
1693                         if ((s = SearchInfostring(string, "qcstatus"     )) != NULL) strlcpy(info->qcstatus, s, sizeof(info->qcstatus));
1694                         if (p                                               != NULL) strlcpy(info->players, p, sizeof(info->players));
1695                         info->numhumans = info->numplayers - max(0, info->numbots);
1696                         info->freeslots = info->maxplayers - info->numplayers;
1697
1698                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1699
1700                         return true;
1701                 }
1702                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1703                 {
1704                         serverlist_info_t *info;
1705                         int n;
1706
1707                         string += 13;
1708                         // search the cache for this server and update it
1709                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1710                         if (n < 0)
1711                                 return true;
1712
1713                         info = &serverlist_cache[n].info;
1714                         info->game[0] = 0;
1715                         info->mod[0]  = 0;
1716                         info->map[0]  = 0;
1717                         info->name[0] = 0;
1718                         info->qcstatus[0] = 0;
1719                         info->players[0] = 0;
1720                         info->protocol = -1;
1721                         info->numplayers = 0;
1722                         info->numbots = -1;
1723                         info->maxplayers  = 0;
1724                         info->gameversion = 0;
1725
1726                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));
1727                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));
1728                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));
1729                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));
1730                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);
1731                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);
1732                         if ((s = SearchInfostring(string, "bots"         )) != NULL) info->numbots = atoi(s);
1733                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);
1734                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);
1735                         if ((s = SearchInfostring(string, "qcstatus"     )) != NULL) strlcpy(info->qcstatus, s, sizeof(info->qcstatus));
1736                         info->numhumans = info->numplayers - max(0, info->numbots);
1737                         info->freeslots = info->maxplayers - info->numplayers;
1738
1739                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1740
1741                         return true;
1742                 }
1743                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1744                 {
1745                         // Extract the IP addresses
1746                         data += 18;
1747                         length -= 18;
1748                         NetConn_ClientParsePacket_ServerList_ParseDPList(peeraddress, data, length, false);
1749                         return true;
1750                 }
1751                 if (!strncmp(string, "getserversExtResponse", 21) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1752                 {
1753                         // Extract the IP addresses
1754                         data += 21;
1755                         length -= 21;
1756                         NetConn_ClientParsePacket_ServerList_ParseDPList(peeraddress, data, length, true);
1757                         return true;
1758                 }
1759                 if (!memcmp(string, "d\n", 2) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1760                 {
1761                         // Extract the IP addresses
1762                         data += 2;
1763                         length -= 2;
1764                         masterreplycount++;
1765                         if (serverlist_consoleoutput)
1766                                 Con_Printf("received QuakeWorld server list from %s...\n", addressstring2);
1767                         while (length >= 6 && (data[0] != 0xFF || data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF) && data[4] * 256 + data[5] != 0)
1768                         {
1769                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[0], data[1], data[2], data[3], data[4] * 256 + data[5]);
1770                                 if (serverlist_consoleoutput && developer_networking.integer)
1771                                         Con_Printf("Requesting info from QuakeWorld server %s\n", ipstring);
1772
1773                                 if( !NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_QUAKEWORLD, ipstring, false ) ) {
1774                                         break;
1775                                 }
1776
1777                                 // move on to next address in packet
1778                                 data += 6;
1779                                 length -= 6;
1780                         }
1781                         // begin or resume serverlist queries
1782                         serverlist_querysleep = false;
1783                         serverlist_querywaittime = realtime + 3;
1784                         return true;
1785                 }
1786                 if (!strncmp(string, "extResponse ", 12))
1787                 {
1788                         ++net_extresponse_count;
1789                         if(net_extresponse_count > NET_EXTRESPONSE_MAX)
1790                                 net_extresponse_count = NET_EXTRESPONSE_MAX;
1791                         net_extresponse_last = (net_extresponse_last + 1) % NET_EXTRESPONSE_MAX;
1792                         dpsnprintf(net_extresponse[net_extresponse_last], sizeof(net_extresponse[net_extresponse_last]), "'%s' %s", addressstring2, string + 12);
1793                         return true;
1794                 }
1795                 if (!strncmp(string, "ping", 4))
1796                 {
1797                         if (developer.integer >= 10)
1798                                 Con_Printf("Received ping from %s, sending ack\n", addressstring2);
1799                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1800                         return true;
1801                 }
1802                 if (!strncmp(string, "ack", 3))
1803                         return true;
1804                 // QuakeWorld compatibility
1805                 if (length > 1 && string[0] == 'c' && (string[1] == '-' || (string[1] >= '0' && string[1] <= '9')) && cls.connect_trying)
1806                 {
1807                         // challenge message
1808                         Con_Printf("challenge %s received, sending QuakeWorld connect request back to %s\n", string + 1, addressstring2);
1809                         M_Update_Return_Reason("Got QuakeWorld challenge response");
1810                         cls.qw_qport = qport.integer;
1811                         // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1812                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1813                         NetConn_WriteString(mysocket, va("\377\377\377\377connect %i %i %i \"%s\"\n", 28, cls.qw_qport, atoi(string + 1), cls.userinfo), peeraddress);
1814                         return true;
1815                 }
1816                 if (length >= 1 && string[0] == 'j' && cls.connect_trying)
1817                 {
1818                         // accept message
1819                         M_Update_Return_Reason("QuakeWorld Accepted");
1820                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_QUAKEWORLD);
1821                         return true;
1822                 }
1823                 if (length > 2 && !memcmp(string, "n\\", 2))
1824                 {
1825                         serverlist_info_t *info;
1826                         int n;
1827
1828                         // qw server status
1829                         if (serverlist_consoleoutput && developer_networking.integer >= 2)
1830                                 Con_Printf("QW server status from server at %s:\n%s\n", addressstring2, string + 1);
1831
1832                         string += 1;
1833                         // search the cache for this server and update it
1834                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1835                         if (n < 0)
1836                                 return true;
1837
1838                         info = &serverlist_cache[n].info;
1839                         strlcpy(info->game, "QuakeWorld", sizeof(info->game));
1840                         if ((s = SearchInfostring(string, "*gamedir"     )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1841                         if ((s = SearchInfostring(string, "map"          )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1842                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1843                         info->protocol = 0;
1844                         info->numplayers = 0; // updated below
1845                         info->numhumans = 0; // updated below
1846                         if ((s = SearchInfostring(string, "maxclients"   )) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1847                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);else info->gameversion = 0;
1848
1849                         // count active players on server
1850                         // (we could gather more info, but we're just after the number)
1851                         s = strchr(string, '\n');
1852                         if (s)
1853                         {
1854                                 s++;
1855                                 while (s < string + length)
1856                                 {
1857                                         for (;s < string + length && *s != '\n';s++)
1858                                                 ;
1859                                         if (s >= string + length)
1860                                                 break;
1861                                         info->numplayers++;
1862                                         info->numhumans++;
1863                                         s++;
1864                                 }
1865                         }
1866
1867                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1868
1869                         return true;
1870                 }
1871                 if (string[0] == 'n')
1872                 {
1873                         // qw print command
1874                         Con_Printf("QW print command from server at %s:\n%s\n", addressstring2, string + 1);
1875                 }
1876                 // we may not have liked the packet, but it was a command packet, so
1877                 // we're done processing this packet now
1878                 return true;
1879         }
1880         // quakeworld ingame packet
1881         if (fromserver && cls.protocol == PROTOCOL_QUAKEWORLD && length >= 8 && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol, net_messagetimeout.value)) == 2)
1882         {
1883                 ret = 0;
1884                 CL_ParseServerMessage();
1885                 return ret;
1886         }
1887         // netquake control packets, supported for compatibility only
1888         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1889         {
1890                 int n;
1891                 serverlist_info_t *info;
1892
1893                 data += 4;
1894                 length -= 4;
1895                 SZ_Clear(&net_message);
1896                 SZ_Write(&net_message, data, length);
1897                 MSG_BeginReading();
1898                 c = MSG_ReadByte();
1899                 switch (c)
1900                 {
1901                 case CCREP_ACCEPT:
1902                         if (developer.integer >= 10)
1903                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
1904                         if (cls.connect_trying)
1905                         {
1906                                 lhnetaddress_t clientportaddress;
1907                                 clientportaddress = *peeraddress;
1908                                 LHNETADDRESS_SetPort(&clientportaddress, MSG_ReadLong());
1909                                 // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1910                                 InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1911                                 M_Update_Return_Reason("Accepted");
1912                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress, PROTOCOL_QUAKE);
1913                         }
1914                         break;
1915                 case CCREP_REJECT:
1916                         if (developer.integer >= 10)
1917                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1918                         cls.connect_trying = false;
1919                         M_Update_Return_Reason((char *)MSG_ReadString());
1920                         break;
1921                 case CCREP_SERVER_INFO:
1922                         if (developer.integer >= 10)
1923                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1924                         // LordHavoc: because the quake server may report weird addresses
1925                         // we just ignore it and keep the real address
1926                         MSG_ReadString();
1927                         // search the cache for this server and update it
1928                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1929                         if (n < 0)
1930                                 break;
1931
1932                         info = &serverlist_cache[n].info;
1933                         strlcpy(info->game, "Quake", sizeof(info->game));
1934                         strlcpy(info->mod , "", sizeof(info->mod)); // mod name is not specified
1935                         strlcpy(info->name, MSG_ReadString(), sizeof(info->name));
1936                         strlcpy(info->map , MSG_ReadString(), sizeof(info->map));
1937                         info->numplayers = MSG_ReadByte();
1938                         info->maxplayers = MSG_ReadByte();
1939                         info->protocol = MSG_ReadByte();
1940
1941                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1942
1943                         break;
1944                 case CCREP_RCON: // RocketGuy: ProQuake rcon support
1945                         if (developer.integer >= 10)
1946                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RCON from %s.\n", addressstring2);
1947
1948                         Con_Printf("%s\n", MSG_ReadString());
1949                         break;
1950                 case CCREP_PLAYER_INFO:
1951                         // we got a CCREP_PLAYER_INFO??
1952                         //if (developer.integer >= 10)
1953                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1954                         break;
1955                 case CCREP_RULE_INFO:
1956                         // we got a CCREP_RULE_INFO??
1957                         //if (developer.integer >= 10)
1958                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1959                         break;
1960                 default:
1961                         break;
1962                 }
1963                 SZ_Clear(&net_message);
1964                 // we may not have liked the packet, but it was a valid control
1965                 // packet, so we're done processing this packet now
1966                 return true;
1967         }
1968         ret = 0;
1969         if (fromserver && length >= (int)NET_HEADERSIZE && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol, net_messagetimeout.value)) == 2)
1970                 CL_ParseServerMessage();
1971         return ret;
1972 }
1973
1974 void NetConn_QueryQueueFrame(void)
1975 {
1976         int index;
1977         int queries;
1978         int maxqueries;
1979         double timeouttime;
1980         static double querycounter = 0;
1981
1982         if(!net_slist_pause.integer && serverlist_paused)
1983                 ServerList_RebuildViewList();
1984         serverlist_paused = net_slist_pause.integer != 0;
1985
1986         if (serverlist_querysleep)
1987                 return;
1988
1989         // apply a cool down time after master server replies,
1990         // to avoid messing up the ping times on the servers
1991         if (serverlist_querywaittime > realtime)
1992                 return;
1993
1994         // each time querycounter reaches 1.0 issue a query
1995         querycounter += cl.realframetime * net_slist_queriespersecond.value;
1996         maxqueries = (int)querycounter;
1997         maxqueries = bound(0, maxqueries, net_slist_queriesperframe.integer);
1998         querycounter -= maxqueries;
1999
2000         if( maxqueries == 0 ) {
2001                 return;
2002         }
2003
2004         //      scan serverlist and issue queries as needed
2005         serverlist_querysleep = true;
2006
2007         timeouttime     = realtime - net_slist_timeout.value;
2008         for( index = 0, queries = 0 ;   index   < serverlist_cachecount &&      queries < maxqueries    ; index++ )
2009         {
2010                 serverlist_entry_t *entry = &serverlist_cache[ index ];
2011                 if( entry->query != SQS_QUERYING && entry->query != SQS_REFRESHING )
2012                 {
2013                         continue;
2014                 }
2015
2016                 serverlist_querysleep   = false;
2017                 if( entry->querycounter !=      0 && entry->querytime > timeouttime     )
2018                 {
2019                         continue;
2020                 }
2021
2022                 if( entry->querycounter !=      (unsigned) net_slist_maxtries.integer )
2023                 {
2024                         lhnetaddress_t  address;
2025                         int socket;
2026
2027                         LHNETADDRESS_FromString(&address, entry->info.cname, 0);
2028                         if      (entry->protocol == PROTOCOL_QUAKEWORLD)
2029                         {
2030                                 for (socket     = 0; socket     < cl_numsockets ;       socket++)
2031                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377status\n", &address);
2032                         }
2033                         else
2034                         {
2035                                 for (socket     = 0; socket     < cl_numsockets ;       socket++)
2036                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377getstatus", &address);
2037                         }
2038
2039                         //      update the entry fields
2040                         entry->querytime = realtime;
2041                         entry->querycounter++;
2042
2043                         // if not in the slist menu we should print the server to console
2044                         if (serverlist_consoleoutput)
2045                                 Con_Printf("querying %25s (%i. try)\n", entry->info.cname, entry->querycounter);
2046
2047                         queries++;
2048                 }
2049                 else
2050                 {
2051                         // have we tried to refresh this server?
2052                         if( entry->query == SQS_REFRESHING ) {
2053                                 // yes, so update the reply count (since its not responding anymore)
2054                                 serverreplycount--;
2055                                 if(!serverlist_paused)
2056                                         ServerList_ViewList_Remove(entry);
2057                         }
2058                         entry->query = SQS_TIMEDOUT;
2059                 }
2060         }
2061 }
2062
2063 void NetConn_ClientFrame(void)
2064 {
2065         int i, length;
2066         lhnetaddress_t peeraddress;
2067         NetConn_UpdateSockets();
2068         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
2069         {
2070                 if (cls.connect_remainingtries == 0)
2071                         M_Update_Return_Reason("Connect: Waiting 10 seconds for reply");
2072                 cls.connect_nextsendtime = realtime + 1;
2073                 cls.connect_remainingtries--;
2074                 if (cls.connect_remainingtries <= -10)
2075                 {
2076                         cls.connect_trying = false;
2077                         M_Update_Return_Reason("Connect: Failed");
2078                         return;
2079                 }
2080                 // try challenge first (newer DP server or QW)
2081                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
2082                 // then try netquake as a fallback (old server, or netquake)
2083                 SZ_Clear(&net_message);
2084                 // save space for the header, filled in later
2085                 MSG_WriteLong(&net_message, 0);
2086                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
2087                 MSG_WriteString(&net_message, "QUAKE");
2088                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
2089                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2090                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
2091                 SZ_Clear(&net_message);
2092         }
2093         for (i = 0;i < cl_numsockets;i++)
2094                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
2095                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
2096         NetConn_QueryQueueFrame();
2097         if (cls.netcon && realtime > cls.netcon->timeout && !sv.active)
2098         {
2099                 Con_Print("Connection timed out\n");
2100                 CL_Disconnect();
2101                 Host_ShutdownServer ();
2102         }
2103 }
2104
2105 #define MAX_CHALLENGES 128
2106 struct challenge_s
2107 {
2108         lhnetaddress_t address;
2109         double time;
2110         char string[12];
2111 }
2112 challenge[MAX_CHALLENGES];
2113
2114 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
2115 {
2116         int i;
2117         char c;
2118         for (i = 0;i < bufferlength - 1;i++)
2119         {
2120                 do
2121                 {
2122                         c = rand () % (127 - 33) + 33;
2123                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
2124                 buffer[i] = c;
2125         }
2126         buffer[i] = 0;
2127 }
2128
2129 /// (div0) build the full response only if possible; better a getinfo response than no response at all if getstatus won't fit
2130 static qboolean NetConn_BuildStatusResponse(const char* challenge, char* out_msg, size_t out_size, qboolean fullstatus)
2131 {
2132         char qcstatus[256];
2133         unsigned int nb_clients = 0, nb_bots = 0, i;
2134         int length;
2135         char teambuf[3];
2136
2137         SV_VM_Begin();
2138
2139         // How many clients are there?
2140         for (i = 0;i < (unsigned int)svs.maxclients;i++)
2141         {
2142                 if (svs.clients[i].active)
2143                 {
2144                         nb_clients++;
2145                         if (!svs.clients[i].netconnection)
2146                                 nb_bots++;
2147                 }
2148         }
2149
2150         *qcstatus = 0;
2151         if(prog->globaloffsets.worldstatus >= 0)
2152         {
2153                 const char *str = PRVM_G_STRING(prog->globaloffsets.worldstatus);
2154                 if(str && *str)
2155                 {
2156                         char *p;
2157                         const char *q;
2158                         p = qcstatus;
2159                         for(q = str; *q; ++q)
2160                                 if(*q != '\\' && *q != '\n')
2161                                         *p++ = *q;
2162                         *p = 0;
2163                 }
2164         }
2165
2166         /// \TODO: we should add more information for the full status string
2167         length = dpsnprintf(out_msg, out_size,
2168                                                 "\377\377\377\377%s\x0A"
2169                                                 "\\gamename\\%s\\modname\\%s\\gameversion\\%d\\sv_maxclients\\%d"
2170                                                 "\\clients\\%d\\bots\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d"
2171                                                 "%s%s"
2172                                                 "%s%s"
2173                                                 "%s",
2174                                                 fullstatus ? "statusResponse" : "infoResponse",
2175                                                 gamename, com_modname, gameversion.integer, svs.maxclients,
2176                                                 nb_clients, nb_bots, sv.name, hostname.string, NET_PROTOCOL_VERSION,
2177                                                 *qcstatus ? "\\qcstatus\\" : "", qcstatus,
2178                                                 challenge ? "\\challenge\\" : "", challenge ? challenge : "",
2179                                                 fullstatus ? "\n" : "");
2180
2181         // Make sure it fits in the buffer
2182         if (length < 0)
2183                 goto bad;
2184
2185         if (fullstatus)
2186         {
2187                 char *ptr;
2188                 int left;
2189                 int savelength;
2190
2191                 savelength = length;
2192
2193                 ptr = out_msg + length;
2194                 left = (int)out_size - length;
2195
2196                 for (i = 0;i < (unsigned int)svs.maxclients;i++)
2197                 {
2198                         client_t *cl = &svs.clients[i];
2199                         if (cl->active)
2200                         {
2201                                 int nameind, cleanind, pingvalue;
2202                                 char curchar;
2203                                 char cleanname [sizeof(cl->name)];
2204
2205                                 // Remove all characters '"' and '\' in the player name
2206                                 nameind = 0;
2207                                 cleanind = 0;
2208                                 do
2209                                 {
2210                                         curchar = cl->name[nameind++];
2211                                         if (curchar != '"' && curchar != '\\')
2212                                         {
2213                                                 cleanname[cleanind++] = curchar;
2214                                                 if (cleanind == sizeof(cleanname) - 1)
2215                                                         break;
2216                                         }
2217                                 } while (curchar != '\0');
2218                                 cleanname[cleanind] = 0; // cleanind is always a valid index even at this point
2219
2220                                 pingvalue = (int)(cl->ping * 1000.0f);
2221                                 if(cl->netconnection)
2222                                         pingvalue = bound(1, pingvalue, 9999);
2223                                 else
2224                                         pingvalue = 0;
2225
2226                                 *qcstatus = 0;
2227                                 if(prog->fieldoffsets.clientstatus >= 0)
2228                                 {
2229                                         const char *str = PRVM_E_STRING(PRVM_EDICT_NUM(i + 1), prog->fieldoffsets.clientstatus);
2230                                         if(str && *str)
2231                                         {
2232                                                 char *p;
2233                                                 const char *q;
2234                                                 p = qcstatus;
2235                                                 for(q = str; *q && p != qcstatus + sizeof(qcstatus) - 1; ++q)
2236                                                         if(*q != '\\' && *q != '"' && !ISWHITESPACE(*q))
2237                                                                 *p++ = *q;
2238                                                 *p = 0;
2239                                         }
2240                                 }
2241
2242                                 if ((gamemode == GAME_NEXUIZ) && (teamplay.integer > 0))
2243                                 {
2244                                         if(cl->frags == -666) // spectator
2245                                                 strlcpy(teambuf, " 0", sizeof(teambuf));
2246                                         else if(cl->colors == 0x44) // red team
2247                                                 strlcpy(teambuf, " 1", sizeof(teambuf));
2248                                         else if(cl->colors == 0xDD) // blue team
2249                                                 strlcpy(teambuf, " 2", sizeof(teambuf));
2250                                         else if(cl->colors == 0xCC) // yellow team
2251                                                 strlcpy(teambuf, " 3", sizeof(teambuf));
2252                                         else if(cl->colors == 0x99) // pink team
2253                                                 strlcpy(teambuf, " 4", sizeof(teambuf));
2254                                         else
2255                                                 strlcpy(teambuf, " 0", sizeof(teambuf));
2256                                 }
2257                                 else
2258                                         *teambuf = 0;
2259
2260                                 // note: team number is inserted according to SoF2 protocol
2261                                 if(*qcstatus)
2262                                         length = dpsnprintf(ptr, left, "%s %d%s \"%s\"\n",
2263                                                                                 qcstatus,
2264                                                                                 pingvalue,
2265                                                                                 teambuf,
2266                                                                                 cleanname);
2267                                 else
2268                                         length = dpsnprintf(ptr, left, "%d %d%s \"%s\"\n",
2269                                                                                 cl->frags,
2270                                                                                 pingvalue,
2271                                                                                 teambuf,
2272                                                                                 cleanname);
2273
2274                                 if(length < 0)
2275                                 {
2276                                         // out of space?
2277                                         // turn it into an infoResponse!
2278                                         out_msg[savelength] = 0;
2279                                         memcpy(out_msg + 4, "infoResponse\x0A", 13);
2280                                         memmove(out_msg + 17, out_msg + 19, savelength - 19);
2281                                         break;
2282                                 }
2283                                 left -= length;
2284                                 ptr += length;
2285                         }
2286                 }
2287         }
2288
2289         SV_VM_End();
2290         return true;
2291
2292 bad:
2293         SV_VM_End();
2294         return false;
2295 }
2296
2297 static qboolean NetConn_PreventConnectFlood(lhnetaddress_t *peeraddress)
2298 {
2299         int floodslotnum, bestfloodslotnum;
2300         double bestfloodtime;
2301         lhnetaddress_t noportpeeraddress;
2302         // see if this is a connect flood
2303         noportpeeraddress = *peeraddress;
2304         LHNETADDRESS_SetPort(&noportpeeraddress, 0);
2305         bestfloodslotnum = 0;
2306         bestfloodtime = sv.connectfloodaddresses[bestfloodslotnum].lasttime;
2307         for (floodslotnum = 0;floodslotnum < MAX_CONNECTFLOODADDRESSES;floodslotnum++)
2308         {
2309                 if (bestfloodtime >= sv.connectfloodaddresses[floodslotnum].lasttime)
2310                 {
2311                         bestfloodtime = sv.connectfloodaddresses[floodslotnum].lasttime;
2312                         bestfloodslotnum = floodslotnum;
2313                 }
2314                 if (sv.connectfloodaddresses[floodslotnum].lasttime && LHNETADDRESS_Compare(&noportpeeraddress, &sv.connectfloodaddresses[floodslotnum].address) == 0)
2315                 {
2316                         // this address matches an ongoing flood address
2317                         if (realtime < sv.connectfloodaddresses[floodslotnum].lasttime + net_connectfloodblockingtimeout.value)
2318                         {
2319                                 // renew the ban on this address so it does not expire
2320                                 // until the flood has subsided
2321                                 sv.connectfloodaddresses[floodslotnum].lasttime = realtime;
2322                                 //Con_Printf("Flood detected!\n");
2323                                 return true;
2324                         }
2325                         // the flood appears to have subsided, so allow this
2326                         bestfloodslotnum = floodslotnum; // reuse the same slot
2327                         break;
2328                 }
2329         }
2330         // begin a new timeout on this address
2331         sv.connectfloodaddresses[bestfloodslotnum].address = noportpeeraddress;
2332         sv.connectfloodaddresses[bestfloodslotnum].lasttime = realtime;
2333         //Con_Printf("Flood detection initiated!\n");
2334         return false;
2335 }
2336
2337 void NetConn_ClearConnectFlood(lhnetaddress_t *peeraddress)
2338 {
2339         int floodslotnum;
2340         lhnetaddress_t noportpeeraddress;
2341         // see if this is a connect flood
2342         noportpeeraddress = *peeraddress;
2343         LHNETADDRESS_SetPort(&noportpeeraddress, 0);
2344         for (floodslotnum = 0;floodslotnum < MAX_CONNECTFLOODADDRESSES;floodslotnum++)
2345         {
2346                 if (sv.connectfloodaddresses[floodslotnum].lasttime && LHNETADDRESS_Compare(&noportpeeraddress, &sv.connectfloodaddresses[floodslotnum].address) == 0)
2347                 {
2348                         // this address matches an ongoing flood address
2349                         // remove the ban
2350                         sv.connectfloodaddresses[floodslotnum].address.addresstype = LHNETADDRESSTYPE_NONE;
2351                         sv.connectfloodaddresses[floodslotnum].lasttime = 0;
2352                         //Con_Printf("Flood cleared!\n");
2353                 }
2354         }
2355 }
2356
2357 typedef qboolean (*rcon_matchfunc_t) (lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen);
2358
2359 qboolean hmac_mdfour_time_matching(lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen)
2360 {
2361         char mdfourbuf[16];
2362         long t1, t2;
2363
2364         t1 = (long) time(NULL);
2365         t2 = strtol(s, NULL, 0);
2366         if(abs(t1 - t2) > rcon_secure_maxdiff.integer)
2367                 return false;
2368
2369         if(!HMAC_MDFOUR_16BYTES((unsigned char *) mdfourbuf, (unsigned char *) s, slen, (unsigned char *) password, strlen(password)))
2370                 return false;
2371
2372         return !memcmp(mdfourbuf, hash, 16);
2373 }
2374
2375 qboolean hmac_mdfour_challenge_matching(lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen)
2376 {
2377         char mdfourbuf[16];
2378         int i;
2379
2380         if(slen < (int)(sizeof(challenge[0].string)) - 1)
2381                 return false;
2382
2383         // validate the challenge
2384         for (i = 0;i < MAX_CHALLENGES;i++)
2385                 if(challenge[i].time > 0)
2386                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strncmp(challenge[i].string, s, sizeof(challenge[0].string) - 1))
2387                                 break;
2388         // if the challenge is not recognized, drop the packet
2389         if (i == MAX_CHALLENGES)
2390                 return false;
2391
2392         if(!HMAC_MDFOUR_16BYTES((unsigned char *) mdfourbuf, (unsigned char *) s, slen, (unsigned char *) password, strlen(password)))
2393                 return false;
2394
2395         if(memcmp(mdfourbuf, hash, 16))
2396                 return false;
2397
2398         // unmark challenge to prevent replay attacks
2399         challenge[i].time = 0;
2400         LHNETADDRESS_FromString(&challenge[i].address, "local:42", 42); // no rcon will come from there for sure
2401         challenge[i].address = *peeraddress;
2402
2403         return true;
2404 }
2405
2406 qboolean plaintext_matching(lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen)
2407 {
2408         return !strcmp(password, hash);
2409 }
2410
2411 /// returns a string describing the user level, or NULL for auth failure
2412 const char *RCon_Authenticate(lhnetaddress_t *peeraddress, const char *password, const char *s, const char *endpos, rcon_matchfunc_t comparator, const char *cs, int cslen)
2413 {
2414         const char *text;
2415         qboolean hasquotes;
2416
2417         if(comparator(peeraddress, rcon_password.string, password, cs, cslen))
2418                 return "rcon";
2419
2420         if(!comparator(peeraddress, rcon_restricted_password.string, password, cs, cslen))
2421                 return NULL;
2422
2423         for(text = s; text != endpos; ++text)
2424                 if((signed char) *text > 0 && ((signed char) *text < (signed char) ' ' || *text == ';'))
2425                         return NULL; // block possible exploits against the parser/alias expansion
2426
2427         while(s != endpos)
2428         {
2429                 size_t l = strlen(s);
2430                 if(l)
2431                 {
2432                         hasquotes = (strchr(s, '"') != NULL);
2433                         // sorry, we can't allow these substrings in wildcard expressions,
2434                         // as they can mess with the argument counts
2435                         text = rcon_restricted_commands.string;
2436                         while(COM_ParseToken_Console(&text))
2437                         {
2438                                 // com_token now contains a pattern to check for...
2439                                 if(strchr(com_token, '*') || strchr(com_token, '?')) // wildcard expression, * can only match a SINGLE argument
2440                                 {
2441                                         if(!hasquotes)
2442                                                 if(matchpattern_with_separator(s, com_token, true, " ", true)) // note how we excluded tab, newline etc. above
2443                                                         goto match;
2444                                 }
2445                                 else if(strchr(com_token, ' ')) // multi-arg expression? must match in whole
2446                                 {
2447                                         if(!strcmp(com_token, s))
2448                                                 goto match;
2449                                 }
2450                                 else // single-arg expression? must match the beginning of the command
2451                                 {
2452                                         if(!strcmp(com_token, s))
2453                                                 goto match;
2454                                         if(!memcmp(va("%s ", com_token), s, strlen(com_token) + 1))
2455                                                 goto match;
2456                                 }
2457                         }
2458                         // if we got here, nothing matched!
2459                         return NULL;
2460                 }
2461 match:
2462                 s += l + 1;
2463         }
2464
2465         return "restricted rcon";
2466 }
2467
2468 void RCon_Execute(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress, const char *addressstring2, const char *userlevel, const char *s, const char *endpos)
2469 {
2470         if(userlevel)
2471         {
2472                 // looks like a legitimate rcon command with the correct password
2473                 const char *s_ptr = s;
2474                 Con_Printf("server received %s command from %s: ", userlevel, host_client ? host_client->name : addressstring2);
2475                 while(s_ptr != endpos)
2476                 {
2477                         size_t l = strlen(s_ptr);
2478                         if(l)
2479                                 Con_Printf(" %s;", s_ptr);
2480                         s_ptr += l + 1;
2481                 }
2482                 Con_Printf("\n");
2483
2484                 if (!host_client || !host_client->netconnection || LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
2485                         Con_Rcon_Redirect_Init(mysocket, peeraddress);
2486                 while(s != endpos)
2487                 {
2488                         size_t l = strlen(s);
2489                         if(l)
2490                         {
2491                                 client_t *host_client_save = host_client;
2492                                 Cmd_ExecuteString(s, src_command);
2493                                 host_client = host_client_save;
2494                                 // in case it is a command that changes host_client (like restart)
2495                         }
2496                         s += l + 1;
2497                 }
2498                 Con_Rcon_Redirect_End();
2499         }
2500         else
2501         {
2502                 Con_Printf("server denied rcon access to %s\n", host_client ? host_client->name : addressstring2);
2503         }
2504 }
2505
2506 extern void SV_SendServerinfo (client_t *client);
2507 static int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
2508 {
2509         int i, ret, clientnum, best;
2510         double besttime;
2511         client_t *client;
2512         char *s, *string, response[1400], addressstring2[128], stringbuf[16384];
2513         qboolean islocal = (LHNETADDRESS_GetAddressType(peeraddress) == LHNETADDRESSTYPE_LOOP);
2514
2515         if (!sv.active)
2516                 return false;
2517
2518         // convert the address to a string incase we need it
2519         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
2520
2521         // see if we can identify the sender as a local player
2522         // (this is necessary for rcon to send a reliable reply if the client is
2523         //  actually on the server, not sending remotely)
2524         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
2525                 if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
2526                         break;
2527         if (i == svs.maxclients)
2528                 host_client = NULL;
2529
2530         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
2531         {
2532                 // received a command string - strip off the packaging and put it
2533                 // into our string buffer with NULL termination
2534                 data += 4;
2535                 length -= 4;
2536                 length = min(length, (int)sizeof(stringbuf) - 1);
2537                 memcpy(stringbuf, data, length);
2538                 stringbuf[length] = 0;
2539                 string = stringbuf;
2540
2541                 if (developer.integer >= 10)
2542                 {
2543                         Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
2544                         Com_HexDumpToConsole(data, length);
2545                 }
2546
2547                 if (length >= 12 && !memcmp(string, "getchallenge", 12) && (islocal || sv_public.integer > -2))
2548                 {
2549                         for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
2550                         {
2551                                 if(challenge[i].time > 0)
2552                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
2553                                                 break;
2554                                 if (besttime > challenge[i].time)
2555                                         besttime = challenge[best = i].time;
2556                         }
2557                         // if we did not find an exact match, choose the oldest and
2558                         // update address and string
2559                         if (i == MAX_CHALLENGES)
2560                         {
2561                                 i = best;
2562                                 challenge[i].address = *peeraddress;
2563                                 NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
2564                         }
2565                         challenge[i].time = realtime;
2566                         // send the challenge
2567                         NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
2568                         return true;
2569                 }
2570                 if (length > 8 && !memcmp(string, "connect\\", 8) && (islocal || sv_public.integer > -2))
2571                 {
2572                         string += 7;
2573                         length -= 7;
2574
2575                         if (!(s = SearchInfostring(string, "challenge")))
2576                                 return true;
2577                         // validate the challenge
2578                         for (i = 0;i < MAX_CHALLENGES;i++)
2579                                 if(challenge[i].time > 0)
2580                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
2581                                                 break;
2582                         // if the challenge is not recognized, drop the packet
2583                         if (i == MAX_CHALLENGES)
2584                                 return true;
2585
2586                         // check engine protocol
2587                         if(!(s = SearchInfostring(string, "protocol")) || strcmp(s, "darkplaces 3"))
2588                         {
2589                                 if (developer.integer >= 10)
2590                                         Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
2591                                 NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
2592                                 return true;
2593                         }
2594
2595                         // see if this is a duplicate connection request or a disconnected
2596                         // client who is rejoining to the same client slot
2597                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2598                         {
2599                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
2600                                 {
2601                                         // this is a known client...
2602                                         if (client->spawned)
2603                                         {
2604                                                 // client crashed and is coming back,
2605                                                 // keep their stuff intact
2606                                                 if (developer.integer >= 10)
2607                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", addressstring2);
2608                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
2609                                                 SV_VM_Begin();
2610                                                 SV_SendServerinfo(client);
2611                                                 SV_VM_End();
2612                                         }
2613                                         else
2614                                         {
2615                                                 // client is still trying to connect,
2616                                                 // so we send a duplicate reply
2617                                                 if (developer.integer >= 10)
2618                                                         Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
2619                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
2620                                         }
2621                                         return true;
2622                                 }
2623                         }
2624
2625                         if (NetConn_PreventConnectFlood(peeraddress))
2626                                 return true;
2627
2628                         // find an empty client slot for this new client
2629                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2630                         {
2631                                 netconn_t *conn;
2632                                 if (!client->active && (conn = NetConn_Open(mysocket, peeraddress)))
2633                                 {
2634                                         // allocated connection
2635                                         if (developer.integer >= 10)
2636                                                 Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
2637                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
2638                                         // now set up the client
2639                                         SV_VM_Begin();
2640                                         SV_ConnectClient(clientnum, conn);
2641                                         SV_VM_End();
2642                                         NetConn_Heartbeat(1);
2643                                         return true;
2644                                 }
2645                         }
2646
2647                         // no empty slots found - server is full
2648                         if (developer.integer >= 10)
2649                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
2650                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
2651
2652                         return true;
2653                 }
2654                 if (length >= 7 && !memcmp(string, "getinfo", 7) && (islocal || sv_public.integer > -1))
2655                 {
2656                         const char *challenge = NULL;
2657
2658                         // If there was a challenge in the getinfo message
2659                         if (length > 8 && string[7] == ' ')
2660                                 challenge = string + 8;
2661
2662                         if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), false))
2663                         {
2664                                 if (developer.integer >= 10)
2665                                         Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
2666                                 NetConn_WriteString(mysocket, response, peeraddress);
2667                         }
2668                         return true;
2669                 }
2670                 if (length >= 9 && !memcmp(string, "getstatus", 9) && (islocal || sv_public.integer > -1))
2671                 {
2672                         const char *challenge = NULL;
2673
2674                         // If there was a challenge in the getinfo message
2675                         if (length > 10 && string[9] == ' ')
2676                                 challenge = string + 10;
2677
2678                         if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), true))
2679                         {
2680                                 if (developer.integer >= 10)
2681                                         Con_Printf("Sending reply to client %s - %s\n", addressstring2, response);
2682                                 NetConn_WriteString(mysocket, response, peeraddress);
2683                         }
2684                         return true;
2685                 }
2686                 if (length >= 37 && !memcmp(string, "srcon HMAC-MD4 TIME ", 20))
2687                 {
2688                         char *password = string + 20;
2689                         char *timeval = string + 37;
2690                         char *s = strchr(timeval, ' ');
2691                         char *endpos = string + length + 1; // one behind the NUL, so adding strlen+1 will eventually reach it
2692                         const char *userlevel;
2693
2694                         if(rcon_secure.integer > 1)
2695                                 return true;
2696
2697                         if(!s)
2698                                 return true; // invalid packet
2699                         ++s;
2700
2701                         userlevel = RCon_Authenticate(peeraddress, password, s, endpos, hmac_mdfour_time_matching, timeval, endpos - timeval - 1); // not including the appended \0 into the HMAC
2702                         RCon_Execute(mysocket, peeraddress, addressstring2, userlevel, s, endpos);
2703                         return true;
2704                 }
2705                 if (length >= 42 && !memcmp(string, "srcon HMAC-MD4 CHALLENGE ", 25))
2706                 {
2707                         char *password = string + 25;
2708                         char *challenge = string + 42;
2709                         char *s = strchr(challenge, ' ');
2710                         char *endpos = string + length + 1; // one behind the NUL, so adding strlen+1 will eventually reach it
2711                         const char *userlevel;
2712                         if(!s)
2713                                 return true; // invalid packet
2714                         ++s;
2715
2716                         userlevel = RCon_Authenticate(peeraddress, password, s, endpos, hmac_mdfour_challenge_matching, challenge, endpos - challenge - 1); // not including the appended \0 into the HMAC
2717                         RCon_Execute(mysocket, peeraddress, addressstring2, userlevel, s, endpos);
2718                         return true;
2719                 }
2720                 if (length >= 5 && !memcmp(string, "rcon ", 5))
2721                 {
2722                         int i;
2723                         char *s = string + 5;
2724                         char *endpos = string + length + 1; // one behind the NUL, so adding strlen+1 will eventually reach it
2725                         char password[64];
2726
2727                         if(rcon_secure.integer)
2728                                 return true;
2729
2730                         for (i = 0;!ISWHITESPACE(*s);s++)
2731                                 if (i < (int)sizeof(password) - 1)
2732                                         password[i++] = *s;
2733                         if(ISWHITESPACE(*s) && s != endpos) // skip leading ugly space
2734                                 ++s;
2735                         password[i] = 0;
2736                         if (!ISWHITESPACE(password[0]))
2737                         {
2738                                 const char *userlevel = RCon_Authenticate(peeraddress, password, s, endpos, plaintext_matching, NULL, 0);
2739                                 RCon_Execute(mysocket, peeraddress, addressstring2, userlevel, s, endpos);
2740                         }
2741                         return true;
2742                 }
2743                 if (!strncmp(string, "ping", 4))
2744                 {
2745                         if (developer.integer >= 10)
2746                                 Con_Printf("Received ping from %s, sending ack\n", addressstring2);
2747                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
2748                         return true;
2749                 }
2750                 if (!strncmp(string, "ack", 3))
2751                         return true;
2752                 // we may not have liked the packet, but it was a command packet, so
2753                 // we're done processing this packet now
2754                 return true;
2755         }
2756         // netquake control packets, supported for compatibility only, and only
2757         // when running game protocols that are normally served via this connection
2758         // protocol
2759         // (this protects more modern protocols against being used for
2760         //  Quake packet flood Denial Of Service attacks)
2761         if (length >= 5 && (i = BigLong(*((int *)data))) && (i & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (i & NETFLAG_LENGTH_MASK) == length && (sv.protocol == PROTOCOL_QUAKE || sv.protocol == PROTOCOL_QUAKEDP || sv.protocol == PROTOCOL_NEHAHRAMOVIE || sv.protocol == PROTOCOL_NEHAHRABJP || sv.protocol == PROTOCOL_NEHAHRABJP2 || sv.protocol == PROTOCOL_NEHAHRABJP3 || sv.protocol == PROTOCOL_DARKPLACES1 || sv.protocol == PROTOCOL_DARKPLACES2 || sv.protocol == PROTOCOL_DARKPLACES3))
2762         {
2763                 int c;
2764                 int protocolnumber;
2765                 const char *protocolname;
2766                 data += 4;
2767                 length -= 4;
2768                 SZ_Clear(&net_message);
2769                 SZ_Write(&net_message, data, length);
2770                 MSG_BeginReading();
2771                 c = MSG_ReadByte();
2772                 switch (c)
2773                 {
2774                 case CCREQ_CONNECT:
2775                         if (developer.integer >= 10)
2776                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
2777                         if(!islocal && sv_public.integer <= -2)
2778                                 break;
2779
2780                         protocolname = MSG_ReadString();
2781                         protocolnumber = MSG_ReadByte();
2782                         if (strcmp(protocolname, "QUAKE") || protocolnumber != NET_PROTOCOL_VERSION)
2783                         {
2784                                 if (developer.integer >= 10)
2785                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
2786                                 SZ_Clear(&net_message);
2787                                 // save space for the header, filled in later
2788                                 MSG_WriteLong(&net_message, 0);
2789                                 MSG_WriteByte(&net_message, CCREP_REJECT);
2790                                 MSG_WriteString(&net_message, "Incompatible version.\n");
2791                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2792                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2793                                 SZ_Clear(&net_message);
2794                                 break;
2795                         }
2796
2797                         // see if this connect request comes from a known client
2798                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2799                         {
2800                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
2801                                 {
2802                                         // this is either a duplicate connection request
2803                                         // or coming back from a timeout
2804                                         // (if so, keep their stuff intact)
2805
2806                                         // send a reply
2807                                         if (developer.integer >= 10)
2808                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
2809                                         SZ_Clear(&net_message);
2810                                         // save space for the header, filled in later
2811                                         MSG_WriteLong(&net_message, 0);
2812                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
2813                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
2814                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2815                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2816                                         SZ_Clear(&net_message);
2817
2818                                         // if client is already spawned, re-send the
2819                                         // serverinfo message as they'll need it to play
2820                                         if (client->spawned)
2821                                         {
2822                                                 SV_VM_Begin();
2823                                                 SV_SendServerinfo(client);
2824                                                 SV_VM_End();
2825                                         }
2826                                         return true;
2827                                 }
2828                         }
2829
2830                         // this is a new client, check for connection flood
2831                         if (NetConn_PreventConnectFlood(peeraddress))
2832                                 break;
2833
2834                         // find a slot for the new client
2835                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2836                         {
2837                                 netconn_t *conn;
2838                                 if (!client->active && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
2839                                 {
2840                                         // connect to the client
2841                                         // everything is allocated, just fill in the details
2842                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
2843                                         if (developer.integer >= 10)
2844                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
2845                                         // send back the info about the server connection
2846                                         SZ_Clear(&net_message);
2847                                         // save space for the header, filled in later
2848                                         MSG_WriteLong(&net_message, 0);
2849                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
2850                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
2851                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2852                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2853                                         SZ_Clear(&net_message);
2854                                         // now set up the client struct
2855                                         SV_VM_Begin();
2856                                         SV_ConnectClient(clientnum, conn);
2857                                         SV_VM_End();
2858                                         NetConn_Heartbeat(1);
2859                                         return true;
2860                                 }
2861                         }
2862
2863                         if (developer.integer >= 10)
2864                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
2865                         // no room; try to let player know
2866                         SZ_Clear(&net_message);
2867                         // save space for the header, filled in later
2868                         MSG_WriteLong(&net_message, 0);
2869                         MSG_WriteByte(&net_message, CCREP_REJECT);
2870                         MSG_WriteString(&net_message, "Server is full.\n");
2871                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2872                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2873                         SZ_Clear(&net_message);
2874                         break;
2875                 case CCREQ_SERVER_INFO:
2876                         if (developer.integer >= 10)
2877                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
2878                         if(!islocal && sv_public.integer <= -1)
2879                                 break;
2880                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
2881                         {
2882                                 int numclients;
2883                                 char myaddressstring[128];
2884                                 if (developer.integer >= 10)
2885                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
2886                                 SZ_Clear(&net_message);
2887                                 // save space for the header, filled in later
2888                                 MSG_WriteLong(&net_message, 0);
2889                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
2890                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), myaddressstring, sizeof(myaddressstring), true);
2891                                 MSG_WriteString(&net_message, myaddressstring);
2892                                 MSG_WriteString(&net_message, hostname.string);
2893                                 MSG_WriteString(&net_message, sv.name);
2894                                 // How many clients are there?
2895                                 for (i = 0, numclients = 0;i < svs.maxclients;i++)
2896                                         if (svs.clients[i].active)
2897                                                 numclients++;
2898                                 MSG_WriteByte(&net_message, numclients);
2899                                 MSG_WriteByte(&net_message, svs.maxclients);
2900                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
2901                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2902                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2903                                 SZ_Clear(&net_message);
2904                         }
2905                         break;
2906                 case CCREQ_PLAYER_INFO:
2907                         if (developer.integer >= 10)
2908                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
2909                         if(!islocal && sv_public.integer <= -1)
2910                                 break;
2911                         if (sv.active)
2912                         {
2913                                 int playerNumber, activeNumber, clientNumber;
2914                                 client_t *client;
2915
2916                                 playerNumber = MSG_ReadByte();
2917                                 activeNumber = -1;
2918                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
2919                                         if (client->active && ++activeNumber == playerNumber)
2920                                                 break;
2921                                 if (clientNumber != svs.maxclients)
2922                                 {
2923                                         SZ_Clear(&net_message);
2924                                         // save space for the header, filled in later
2925                                         MSG_WriteLong(&net_message, 0);
2926                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
2927                                         MSG_WriteByte(&net_message, playerNumber);
2928                                         MSG_WriteString(&net_message, client->name);
2929                                         MSG_WriteLong(&net_message, client->colors);
2930                                         MSG_WriteLong(&net_message, client->frags);
2931                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
2932                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
2933                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2934                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2935                                         SZ_Clear(&net_message);
2936                                 }
2937                         }
2938                         break;
2939                 case CCREQ_RULE_INFO:
2940                         if (developer.integer >= 10)
2941                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
2942                         if(!islocal && sv_public.integer <= -1)
2943                                 break;
2944                         if (sv.active)
2945                         {
2946                                 char *prevCvarName;
2947                                 cvar_t *var;
2948
2949                                 // find the search start location
2950                                 prevCvarName = MSG_ReadString();
2951                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
2952
2953                                 // send the response
2954                                 SZ_Clear(&net_message);
2955                                 // save space for the header, filled in later
2956                                 MSG_WriteLong(&net_message, 0);
2957                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
2958                                 if (var)
2959                                 {
2960                                         MSG_WriteString(&net_message, var->name);
2961                                         MSG_WriteString(&net_message, var->string);
2962                                 }
2963                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2964                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2965                                 SZ_Clear(&net_message);
2966                         }
2967                         break;
2968                 default:
2969                         break;
2970                 }
2971                 SZ_Clear(&net_message);
2972                 // we may not have liked the packet, but it was a valid control
2973                 // packet, so we're done processing this packet now
2974                 return true;
2975         }
2976         if (host_client)
2977         {
2978                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length, sv.protocol, host_client->spawned ? net_messagetimeout.value : net_connecttimeout.value)) == 2)
2979                 {
2980                         SV_VM_Begin();
2981                         SV_ReadClientMessage();
2982                         SV_VM_End();
2983                         return ret;
2984                 }
2985         }
2986         return 0;
2987 }
2988
2989 void NetConn_ServerFrame(void)
2990 {
2991         int i, length;
2992         lhnetaddress_t peeraddress;
2993         for (i = 0;i < sv_numsockets;i++)
2994                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
2995                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
2996         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
2997         {
2998                 // never timeout loopback connections
2999                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
3000                 {
3001                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
3002                         SV_VM_Begin();
3003                         SV_DropClient(false);
3004                         SV_VM_End();
3005                 }
3006         }
3007 }
3008
3009 void NetConn_SleepMicroseconds(int microseconds)
3010 {
3011         LHNET_SleepUntilPacket_Microseconds(microseconds);
3012 }
3013
3014 void NetConn_QueryMasters(qboolean querydp, qboolean queryqw)
3015 {
3016         int i, j;
3017         int masternum;
3018         lhnetaddress_t masteraddress;
3019         lhnetaddress_t broadcastaddress;
3020         char request[256];
3021
3022         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
3023                 return;
3024
3025         // 26000 is the default quake server port, servers on other ports will not
3026         // be found
3027         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
3028         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
3029
3030         if (querydp)
3031         {
3032                 for (i = 0;i < cl_numsockets;i++)
3033                 {
3034                         if (cl_sockets[i])
3035                         {
3036                                 const char *cmdname, *extraoptions;
3037                                 int af = LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i]));
3038
3039                                 if(LHNETADDRESS_GetAddressType(&broadcastaddress) == af)
3040                                 {
3041                                         // search LAN for Quake servers
3042                                         SZ_Clear(&net_message);
3043                                         // save space for the header, filled in later
3044                                         MSG_WriteLong(&net_message, 0);
3045                                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
3046                                         MSG_WriteString(&net_message, "QUAKE");
3047                                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
3048                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
3049                                         NetConn_Write(cl_sockets[i], net_message.data, net_message.cursize, &broadcastaddress);
3050                                         SZ_Clear(&net_message);
3051
3052                                         // search LAN for DarkPlaces servers
3053                                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377getstatus", &broadcastaddress);
3054                                 }
3055
3056                                 // build the getservers message to send to the dpmaster master servers
3057                                 if (LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == LHNETADDRESSTYPE_INET6)
3058                                 {
3059                                         cmdname = "getserversExt";
3060                                         extraoptions = " ipv4 ipv6";  // ask for IPv4 and IPv6 servers
3061                                 }
3062                                 else
3063                                 {
3064                                         cmdname = "getservers";
3065                                         extraoptions = "";
3066                                 }
3067                                 dpsnprintf(request, sizeof(request), "\377\377\377\377%s %s %u empty full%s", cmdname, gamename, NET_PROTOCOL_VERSION, extraoptions);
3068
3069                                 // search internet
3070                                 for (masternum = 0;sv_masters[masternum].name;masternum++)
3071                                 {
3072                                         if (sv_masters[masternum].string && sv_masters[masternum].string[0] && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, DPMASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == af)
3073                                         {
3074                                                 masterquerycount++;
3075                                                 NetConn_WriteString(cl_sockets[i], request, &masteraddress);
3076                                         }
3077                                 }
3078
3079                                 // search favorite servers
3080                                 for(j = 0; j < nFavorites; ++j)
3081                                 {
3082                                         if(LHNETADDRESS_GetAddressType(&favorites[j]) == af)
3083                                         {
3084                                                 if(LHNETADDRESS_ToString(&favorites[j], request, sizeof(request), true))
3085                                                         NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_DARKPLACES7, request, true );
3086                                         }
3087                                 }
3088                         }
3089                 }
3090         }
3091
3092         // only query QuakeWorld servers when the user wants to
3093         if (queryqw)
3094         {
3095                 for (i = 0;i < cl_numsockets;i++)
3096                 {
3097                         if (cl_sockets[i])
3098                         {
3099                                 int af = LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i]));
3100
3101                                 if(LHNETADDRESS_GetAddressType(&broadcastaddress) == af)
3102                                 {
3103                                         // search LAN for QuakeWorld servers
3104                                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377status\n", &broadcastaddress);
3105
3106                                         // build the getservers message to send to the qwmaster master servers
3107                                         // note this has no -1 prefix, and the trailing nul byte is sent
3108                                         dpsnprintf(request, sizeof(request), "c\n");
3109                                 }
3110
3111                                 // search internet
3112                                 for (masternum = 0;sv_qwmasters[masternum].name;masternum++)
3113                                 {
3114                                         if (sv_qwmasters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_qwmasters[masternum].string, QWMASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
3115                                         {
3116                                                 if (m_state != m_slist)
3117                                                 {
3118                                                         char lookupstring[128];
3119                                                         LHNETADDRESS_ToString(&masteraddress, lookupstring, sizeof(lookupstring), true);
3120                                                         Con_Printf("Querying master %s (resolved from %s)\n", lookupstring, sv_qwmasters[masternum].string);
3121                                                 }
3122                                                 masterquerycount++;
3123                                                 NetConn_Write(cl_sockets[i], request, (int)strlen(request) + 1, &masteraddress);
3124                                         }
3125                                 }
3126
3127                                 // search favorite servers
3128                                 for(j = 0; j < nFavorites; ++j)
3129                                 {
3130                                         if(LHNETADDRESS_GetAddressType(&favorites[j]) == af)
3131                                         {
3132                                                 if(LHNETADDRESS_ToString(&favorites[j], request, sizeof(request), true))
3133                                                 {
3134                                                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377status\n", &favorites[j]);
3135                                                         NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_QUAKEWORLD, request, true );
3136                                                 }
3137                                         }
3138                                 }
3139                         }
3140                 }
3141         }
3142         if (!masterquerycount)
3143         {
3144                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
3145                 M_Update_Return_Reason("No network");
3146         }
3147 }
3148
3149 void NetConn_Heartbeat(int priority)
3150 {
3151         lhnetaddress_t masteraddress;
3152         int masternum;
3153         lhnetsocket_t *mysocket;
3154
3155         // if it's a state change (client connected), limit next heartbeat to no
3156         // more than 30 sec in the future
3157         if (priority == 1 && nextheartbeattime > realtime + 30.0)
3158                 nextheartbeattime = realtime + 30.0;
3159
3160         // limit heartbeatperiod to 30 to 270 second range,
3161         // lower limit is to avoid abusing master servers with excess traffic,
3162         // upper limit is to avoid timing out on the master server (which uses
3163         // 300 sec timeout)
3164         if (sv_heartbeatperiod.value < 30)
3165                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
3166         if (sv_heartbeatperiod.value > 270)
3167                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
3168
3169         // make advertising optional and don't advertise singleplayer games, and
3170         // only send a heartbeat as often as the admin wants
3171         if (sv.active && sv_public.integer > 0 && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
3172         {
3173                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
3174                 for (masternum = 0;sv_masters[masternum].name;masternum++)
3175                         if (sv_masters[masternum].string && sv_masters[masternum].string[0] && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, DPMASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
3176                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
3177         }
3178 }
3179
3180 static void Net_Heartbeat_f(void)
3181 {
3182         if (sv.active)
3183                 NetConn_Heartbeat(2);
3184         else
3185                 Con_Print("No server running, can not heartbeat to master server.\n");
3186 }
3187
3188 void PrintStats(netconn_t *conn)
3189 {
3190         if ((cls.state == ca_connected && cls.protocol == PROTOCOL_QUAKEWORLD) || (sv.active && sv.protocol == PROTOCOL_QUAKEWORLD))
3191                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->outgoing_unreliable_sequence, conn->qw.incoming_sequence);
3192         else
3193                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->nq.sendSequence, conn->nq.receiveSequence);
3194 }
3195
3196 void Net_Stats_f(void)
3197 {
3198         netconn_t *conn;
3199         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
3200         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
3201         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
3202         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
3203         Con_Printf("packetsSent                = %i\n", packetsSent);
3204         Con_Printf("packetsReSent              = %i\n", packetsReSent);
3205         Con_Printf("packetsReceived            = %i\n", packetsReceived);
3206         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
3207         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
3208         Con_Print("connections                =\n");
3209         for (conn = netconn_list;conn;conn = conn->next)
3210                 PrintStats(conn);
3211 }
3212
3213 void Net_Refresh_f(void)
3214 {
3215         if (m_state != m_slist) {
3216                 Con_Print("Sending new requests to master servers\n");
3217                 ServerList_QueryList(false, true, false, true);
3218                 Con_Print("Listening for replies...\n");
3219         } else
3220                 ServerList_QueryList(false, true, false, false);
3221 }
3222
3223 void Net_Slist_f(void)
3224 {
3225         ServerList_ResetMasks();
3226         serverlist_sortbyfield = SLIF_PING;
3227         serverlist_sortflags = 0;
3228     if (m_state != m_slist) {
3229                 Con_Print("Sending requests to master servers\n");
3230                 ServerList_QueryList(true, true, false, true);
3231                 Con_Print("Listening for replies...\n");
3232         } else
3233                 ServerList_QueryList(true, true, false, false);
3234 }
3235
3236 void Net_SlistQW_f(void)
3237 {
3238         ServerList_ResetMasks();
3239         serverlist_sortbyfield = SLIF_PING;
3240         serverlist_sortflags = 0;
3241     if (m_state != m_slist) {
3242                 Con_Print("Sending requests to master servers\n");
3243                 ServerList_QueryList(true, false, true, true);
3244                 serverlist_consoleoutput = true;
3245                 Con_Print("Listening for replies...\n");
3246         } else
3247                 ServerList_QueryList(true, false, true, false);
3248 }
3249
3250 void NetConn_Init(void)
3251 {
3252         int i;
3253         lhnetaddress_t tempaddress;
3254         netconn_mempool = Mem_AllocPool("network connections", 0, NULL);
3255         Cmd_AddCommand("net_stats", Net_Stats_f, "print network statistics");
3256         Cmd_AddCommand("net_slist", Net_Slist_f, "query dp master servers and print all server information");
3257         Cmd_AddCommand("net_slistqw", Net_SlistQW_f, "query qw master servers and print all server information");
3258         Cmd_AddCommand("net_refresh", Net_Refresh_f, "query dp master servers and refresh all server information");
3259         Cmd_AddCommand("heartbeat", Net_Heartbeat_f, "send a heartbeat to the master server (updates your server information)");
3260         Cvar_RegisterVariable(&rcon_restricted_password);
3261         Cvar_RegisterVariable(&rcon_restricted_commands);
3262         Cvar_RegisterVariable(&rcon_secure_maxdiff);
3263         Cvar_RegisterVariable(&net_slist_queriespersecond);
3264         Cvar_RegisterVariable(&net_slist_queriesperframe);
3265         Cvar_RegisterVariable(&net_slist_timeout);
3266         Cvar_RegisterVariable(&net_slist_maxtries);
3267         Cvar_RegisterVariable(&net_slist_favorites);
3268         Cvar_RegisterVariable(&net_slist_pause);
3269         Cvar_RegisterVariable(&net_messagetimeout);
3270         Cvar_RegisterVariable(&net_connecttimeout);
3271         Cvar_RegisterVariable(&net_connectfloodblockingtimeout);
3272         Cvar_RegisterVariable(&cl_netlocalping);
3273         Cvar_RegisterVariable(&cl_netpacketloss_send);
3274         Cvar_RegisterVariable(&cl_netpacketloss_receive);
3275         Cvar_RegisterVariable(&hostname);
3276         Cvar_RegisterVariable(&developer_networking);
3277         Cvar_RegisterVariable(&cl_netport);
3278         Cvar_RegisterVariable(&sv_netport);
3279         Cvar_RegisterVariable(&net_address);
3280         Cvar_RegisterVariable(&net_address_ipv6);
3281         Cvar_RegisterVariable(&sv_public);
3282         Cvar_RegisterVariable(&sv_heartbeatperiod);
3283         for (i = 0;sv_masters[i].name;i++)
3284                 Cvar_RegisterVariable(&sv_masters[i]);
3285         Cvar_RegisterVariable(&gameversion);
3286         Cvar_RegisterVariable(&gameversion_min);
3287         Cvar_RegisterVariable(&gameversion_max);
3288 // 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.
3289         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
3290         {
3291                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
3292                 {
3293                         Con_Printf("-ip option used, setting net_address to \"%s\"\n", com_argv[i + 1]);
3294                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
3295                 }
3296                 else
3297                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
3298         }
3299 // 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
3300         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
3301         {
3302                 i = atoi(com_argv[i + 1]);
3303                 if (i >= 0 && i < 65536)
3304                 {
3305                         Con_Printf("-port option used, setting port cvar to %i\n", i);
3306                         Cvar_SetValueQuick(&sv_netport, i);
3307                 }
3308                 else
3309                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
3310         }
3311         cl_numsockets = 0;
3312         sv_numsockets = 0;
3313         net_message.data = net_message_buf;
3314         net_message.maxsize = sizeof(net_message_buf);
3315         net_message.cursize = 0;
3316         LHNET_Init();
3317 }
3318
3319 void NetConn_Shutdown(void)
3320 {
3321         NetConn_CloseClientPorts();
3322         NetConn_CloseServerPorts();
3323         LHNET_Shutdown();
3324 }
3325