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; -3: already block at getchallenge level"};
  36 cvar_t sv_public_rejectreason = {0, "sv_public_rejectreason", "The server is closing.", "Rejection reason for connects when sv_public is -2"};
  37 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "120", "how often to send heartbeat in seconds (only used if sv_public is 1)"};
  38
  39 static cvar_t sv_masters [] =
  40 {
  41         {CVAR_SAVE, "sv_master1", "", "user-chosen master server 1"},
  42         {CVAR_SAVE, "sv_master2", "", "user-chosen master server 2"},
  43         {CVAR_SAVE, "sv_master3", "", "user-chosen master server 3"},
  44         {CVAR_SAVE, "sv_master4", "", "user-chosen master server 4"},
  45         {0, "sv_masterextra1", "69.59.212.88", "ghdigital.com - default master server 1 (admin: LordHavoc)"}, // admin: LordHavoc
  46         {0, "sv_masterextra2", "64.22.107.125", "dpmaster.deathmask.net - default master server 2 (admin: Willis)"}, // admin: Willis
  47         {0, "sv_masterextra3", "92.62.40.73", "dpmaster.tchr.no - default master server 3 (admin: tChr)"}, // admin: tChr
  48         {0, NULL, NULL, NULL}
  49 };
  50
  51 static cvar_t sv_qwmasters [] =
  52 {
  53         {CVAR_SAVE, "sv_qwmaster1", "", "user-chosen qwmaster server 1"},
  54         {CVAR_SAVE, "sv_qwmaster2", "", "user-chosen qwmaster server 2"},
  55         {CVAR_SAVE, "sv_qwmaster3", "", "user-chosen qwmaster server 3"},
  56         {CVAR_SAVE, "sv_qwmaster4", "", "user-chosen qwmaster server 4"},
  57         {0, "sv_qwmasterextra1", "master.quakeservers.net:27000", "Global master server. (admin: unknown)"},
  58         {0, "sv_qwmasterextra2", "asgaard.morphos-team.net:27000", "Global master server. (admin: unknown)"},
  59         {0, "sv_qwmasterextra3", "qwmaster.ocrana.de:27000", "German master server. (admin: unknown)"},
  60         {0, "sv_qwmasterextra4", "masterserver.exhale.de:27000", "German master server. (admin: unknown)"},
  61         {0, "sv_qwmasterextra5", "kubus.rulez.pl:27000", "Poland master server. (admin: unknown)"},
  62         {0, NULL, NULL, NULL}
  63 };
  64
  65 static double nextheartbeattime = 0;
  66
  67 sizebuf_t net_message;
  68 static unsigned char net_message_buf[NET_MAXMESSAGE];
  69
  70 cvar_t net_messagetimeout = {0, "net_messagetimeout","300", "drops players who have not sent any packets for this many seconds"};
  71 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."};
  72 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)"};
  73 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED", "server message to show in server browser"};
  74 cvar_t developer_networking = {0, "developer_networking", "0", "prints all received and sent packets (recommended only for debugging)"};
  75
  76 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)"};
  77 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)"};
  78 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)"};
  79 static cvar_t net_slist_queriespersecond = {0, "net_slist_queriespersecond", "20", "how many server information requests to send per second"};
  80 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)"};
  81 static cvar_t net_slist_timeout = {0, "net_slist_timeout", "4", "how long to listen for a server information response before giving up"};
  82 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"};
  83 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)"};
  84 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"};
  85 static cvar_t gameversion = {0, "gameversion", "0", "version of game data (mod-specific) to be sent to querying clients"};
  86 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"};
  87 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"};
  88 static cvar_t rcon_restricted_password = {CVAR_PRIVATE, "rcon_restricted_password", "", "password to authenticate rcon commands in restricted mode; may be set to a string of the form user1:pass1 user2:pass2 user3:pass3 to allow multiple user accounts - the client then has to specify ONE of these combinations"};
  89 static cvar_t rcon_restricted_commands = {0, "rcon_restricted_commands", "", "allowed commands for rcon when the restricted mode password was used"};
  90 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)"};
  91 extern cvar_t rcon_secure;
  92 extern cvar_t rcon_secure_challengetimeout;
  93
  94 /* statistic counters */
  95 static int packetsSent = 0;
  96 static int packetsReSent = 0;
  97 static int packetsReceived = 0;
  98 static int receivedDuplicateCount = 0;
  99 static int droppedDatagrams = 0;
 100
 101 static int unreliableMessagesSent = 0;
 102 static int unreliableMessagesReceived = 0;
 103 static int reliableMessagesSent = 0;
 104 static int reliableMessagesReceived = 0;
 105
 106 double masterquerytime = -1000;
 107 int masterquerycount = 0;
 108 int masterreplycount = 0;
 109 int serverquerycount = 0;
 110 int serverreplycount = 0;
 111
 112 /// this is only false if there are still servers left to query
 113 static qboolean serverlist_querysleep = true;
 114 static qboolean serverlist_paused = false;
 115 /// this is pushed a second or two ahead of realtime whenever a master server
 116 /// reply is received, to avoid issuing queries while master replies are still
 117 /// flooding in (which would make a mess of the ping times)
 118 static double serverlist_querywaittime = 0;
 119
 120 static unsigned char sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
 121 static unsigned char readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
 122
 123 static int cl_numsockets;
 124 static lhnetsocket_t *cl_sockets[16];
 125 static int sv_numsockets;
 126 static lhnetsocket_t *sv_sockets[16];
 127
 128 netconn_t *netconn_list = NULL;
 129 mempool_t *netconn_mempool = NULL;
 130
 131 cvar_t cl_netport = {0, "cl_port", "0", "forces client to use chosen port number if not 0"};
 132 cvar_t sv_netport = {0, "port", "26000", "server port for players to connect to"};
 133 cvar_t net_address = {0, "net_address", "", "network address to open ipv4 ports on (if empty, use default interfaces)"};
 134 cvar_t net_address_ipv6 = {0, "net_address_ipv6", "", "network address to open ipv6 ports on (if empty, use default interfaces)"};
 135
 136 char cl_net_extresponse[NET_EXTRESPONSE_MAX][1400];
 137 int cl_net_extresponse_count = 0;
 138 int cl_net_extresponse_last = 0;
 139
 140 char sv_net_extresponse[NET_EXTRESPONSE_MAX][1400];
 141 int sv_net_extresponse_count = 0;
 142 int sv_net_extresponse_last = 0;
 143
 144 // ServerList interface
 145 serverlist_mask_t serverlist_andmasks[SERVERLIST_ANDMASKCOUNT];
 146 serverlist_mask_t serverlist_ormasks[SERVERLIST_ORMASKCOUNT];
 147
 148 serverlist_infofield_t serverlist_sortbyfield;
 149 int serverlist_sortflags;
 150
 151 int serverlist_viewcount = 0;
 152 unsigned short serverlist_viewlist[SERVERLIST_VIEWLISTSIZE];
 153
 154 int serverlist_maxcachecount = 0;
 155 int serverlist_cachecount = 0;
 156 serverlist_entry_t *serverlist_cache = NULL;
 157
 158 qboolean serverlist_consoleoutput;
 159
 160 static int nFavorites = 0;
 161 static lhnetaddress_t favorites[MAX_FAVORITESERVERS];
 162
 163 void NetConn_UpdateFavorites(void)
 164 {
 165         const char *p;
 166         nFavorites = 0;
 167         p = net_slist_favorites.string;
 168         while((size_t) nFavorites < sizeof(favorites) / sizeof(*favorites) && COM_ParseToken_Console(&p))
 169         {
 170                 if(LHNETADDRESS_FromString(&favorites[nFavorites], com_token, 26000))
 171                         ++nFavorites;
 172         }
 173 }
 174
 175 /// helper function to insert a value into the viewset
 176 /// spare entries will be removed
 177 static void _ServerList_ViewList_Helper_InsertBefore( int index, serverlist_entry_t *entry )
 178 {
 179     int i;
 180         if( serverlist_viewcount < SERVERLIST_VIEWLISTSIZE ) {
 181                 i = serverlist_viewcount++;
 182         } else {
 183                 i = SERVERLIST_VIEWLISTSIZE - 1;
 184         }
 185
 186         for( ; i > index ; i-- )
 187                 serverlist_viewlist[ i ] = serverlist_viewlist[ i - 1 ];
 188
 189         serverlist_viewlist[index] = (int)(entry - serverlist_cache);
 190 }
 191
 192 /// we suppose serverlist_viewcount to be valid, ie > 0
 193 static void _ServerList_ViewList_Helper_Remove( int index )
 194 {
 195         serverlist_viewcount--;
 196         for( ; index < serverlist_viewcount ; index++ )
 197                 serverlist_viewlist[index] = serverlist_viewlist[index + 1];
 198 }
 199
 200 /// \returns true if A should be inserted before B
 201 static qboolean _ServerList_Entry_Compare( serverlist_entry_t *A, serverlist_entry_t *B )
 202 {
 203         int result = 0; // > 0 if for numbers A > B and for text if A < B
 204
 205         if( serverlist_sortflags & SLSF_FAVORITESFIRST )
 206         {
 207                 if(A->info.isfavorite != B->info.isfavorite)
 208                         return A->info.isfavorite;
 209         }
 210
 211         switch( serverlist_sortbyfield ) {
 212                 case SLIF_PING:
 213                         result = A->info.ping - B->info.ping;
 214                         break;
 215                 case SLIF_MAXPLAYERS:
 216                         result = A->info.maxplayers - B->info.maxplayers;
 217                         break;
 218                 case SLIF_NUMPLAYERS:
 219                         result = A->info.numplayers - B->info.numplayers;
 220                         break;
 221                 case SLIF_NUMBOTS:
 222                         result = A->info.numbots - B->info.numbots;
 223                         break;
 224                 case SLIF_NUMHUMANS:
 225                         result = A->info.numhumans - B->info.numhumans;
 226                         break;
 227                 case SLIF_FREESLOTS:
 228                         result = A->info.freeslots - B->info.freeslots;
 229                         break;
 230                 case SLIF_PROTOCOL:
 231                         result = A->info.protocol - B->info.protocol;
 232                         break;
 233                 case SLIF_CNAME:
 234                         result = strcmp( B->info.cname, A->info.cname );
 235                         break;
 236                 case SLIF_GAME:
 237                         result = strcasecmp( B->info.game, A->info.game );
 238                         break;
 239                 case SLIF_MAP:
 240                         result = strcasecmp( B->info.map, A->info.map );
 241                         break;
 242                 case SLIF_MOD:
 243                         result = strcasecmp( B->info.mod, A->info.mod );
 244                         break;
 245                 case SLIF_NAME:
 246                         result = strcasecmp( B->info.name, A->info.name );
 247                         break;
 248                 case SLIF_QCSTATUS:
 249                         result = strcasecmp( B->info.qcstatus, A->info.qcstatus ); // not really THAT useful, though
 250                         break;
 251                 case SLIF_ISFAVORITE:
 252                         result = !!B->info.isfavorite - !!A->info.isfavorite;
 253                         break;
 254                 default:
 255                         Con_DPrint( "_ServerList_Entry_Compare: Bad serverlist_sortbyfield!\n" );
 256                         break;
 257         }
 258
 259         if (result != 0)
 260         {
 261                 if( serverlist_sortflags & SLSF_DESCENDING )
 262                         return result > 0;
 263                 else
 264                         return result < 0;
 265         }
 266
 267         // if the chosen sort key is identical, sort by index
 268         // (makes this a stable sort, so that later replies from servers won't
 269         //  shuffle the servers around when they have the same ping)
 270         return A < B;
 271 }
 272
 273 static qboolean _ServerList_CompareInt( int A, serverlist_maskop_t op, int B )
 274 {
 275         // This should actually be done with some intermediate and end-of-function return
 276         switch( op ) {
 277                 case SLMO_LESS:
 278                         return A < B;
 279                 case SLMO_LESSEQUAL:
 280                         return A <= B;
 281                 case SLMO_EQUAL:
 282                         return A == B;
 283                 case SLMO_GREATER:
 284                         return A > B;
 285                 case SLMO_NOTEQUAL:
 286                         return A != B;
 287                 case SLMO_GREATEREQUAL:
 288                 case SLMO_CONTAINS:
 289                 case SLMO_NOTCONTAIN:
 290                 case SLMO_STARTSWITH:
 291                 case SLMO_NOTSTARTSWITH:
 292                         return A >= B;
 293                 default:
 294                         Con_DPrint( "_ServerList_CompareInt: Bad op!\n" );
 295                         return false;
 296         }
 297 }
 298
 299 static qboolean _ServerList_CompareStr( const char *A, serverlist_maskop_t op, const char *B )
 300 {
 301         int i;
 302         char bufferA[ 1400 ], bufferB[ 1400 ]; // should be more than enough
 303         COM_StringDecolorize(A, 0, bufferA, sizeof(bufferA), false);
 304         for (i = 0;i < (int)sizeof(bufferA)-1 && bufferA[i];i++)
 305                 bufferA[i] = (bufferA[i] >= 'A' && bufferA[i] <= 'Z') ? (bufferA[i] + 'a' - 'A') : bufferA[i];
 306         bufferA[i] = 0;
 307         for (i = 0;i < (int)sizeof(bufferB)-1 && B[i];i++)
 308                 bufferB[i] = (B[i] >= 'A' && B[i] <= 'Z') ? (B[i] + 'a' - 'A') : B[i];
 309         bufferB[i] = 0;
 310
 311         // Same here, also using an intermediate & final return would be more appropriate
 312         // A info B mask
 313         switch( op ) {
 314                 case SLMO_CONTAINS:
 315                         return *bufferB && !!strstr( bufferA, bufferB ); // we want a real bool
 316                 case SLMO_NOTCONTAIN:
 317                         return !*bufferB || !strstr( bufferA, bufferB );
 318                 case SLMO_STARTSWITH:
 319                         //Con_Printf("startsWith: %s %s\n", bufferA, bufferB);
 320                         return *bufferB && !memcmp(bufferA, bufferB, strlen(bufferB));
 321                 case SLMO_NOTSTARTSWITH:
 322                         return !*bufferB || memcmp(bufferA, bufferB, strlen(bufferB));
 323                 case SLMO_LESS:
 324                         return strcmp( bufferA, bufferB ) < 0;
 325                 case SLMO_LESSEQUAL:
 326                         return strcmp( bufferA, bufferB ) <= 0;
 327                 case SLMO_EQUAL:
 328                         return strcmp( bufferA, bufferB ) == 0;
 329                 case SLMO_GREATER:
 330                         return strcmp( bufferA, bufferB ) > 0;
 331                 case SLMO_NOTEQUAL:
 332                         return strcmp( bufferA, bufferB ) != 0;
 333                 case SLMO_GREATEREQUAL:
 334                         return strcmp( bufferA, bufferB ) >= 0;
 335                 default:
 336                         Con_DPrint( "_ServerList_CompareStr: Bad op!\n" );
 337                         return false;
 338         }
 339 }
 340
 341 static qboolean _ServerList_Entry_Mask( serverlist_mask_t *mask, serverlist_info_t *info )
 342 {
 343         if( !_ServerList_CompareInt( info->ping, mask->tests[SLIF_PING], mask->info.ping ) )
 344                 return false;
 345         if( !_ServerList_CompareInt( info->maxplayers, mask->tests[SLIF_MAXPLAYERS], mask->info.maxplayers ) )
 346                 return false;
 347         if( !_ServerList_CompareInt( info->numplayers, mask->tests[SLIF_NUMPLAYERS], mask->info.numplayers ) )
 348                 return false;
 349         if( !_ServerList_CompareInt( info->numbots, mask->tests[SLIF_NUMBOTS], mask->info.numbots ) )
 350                 return false;
 351         if( !_ServerList_CompareInt( info->numhumans, mask->tests[SLIF_NUMHUMANS], mask->info.numhumans ) )
 352                 return false;
 353         if( !_ServerList_CompareInt( info->freeslots, mask->tests[SLIF_FREESLOTS], mask->info.freeslots ) )
 354                 return false;
 355         if( !_ServerList_CompareInt( info->protocol, mask->tests[SLIF_PROTOCOL], mask->info.protocol ))
 356                 return false;
 357         if( *mask->info.cname
 358                 && !_ServerList_CompareStr( info->cname, mask->tests[SLIF_CNAME], mask->info.cname ) )
 359                 return false;
 360         if( *mask->info.game
 361                 && !_ServerList_CompareStr( info->game, mask->tests[SLIF_GAME], mask->info.game ) )
 362                 return false;
 363         if( *mask->info.mod
 364                 && !_ServerList_CompareStr( info->mod, mask->tests[SLIF_MOD], mask->info.mod ) )
 365                 return false;
 366         if( *mask->info.map
 367                 && !_ServerList_CompareStr( info->map, mask->tests[SLIF_MAP], mask->info.map ) )
 368                 return false;
 369         if( *mask->info.name
 370                 && !_ServerList_CompareStr( info->name, mask->tests[SLIF_NAME], mask->info.name ) )
 371                 return false;
 372         if( *mask->info.qcstatus
 373                 && !_ServerList_CompareStr( info->qcstatus, mask->tests[SLIF_QCSTATUS], mask->info.qcstatus ) )
 374                 return false;
 375         if( *mask->info.players
 376                 && !_ServerList_CompareStr( info->players, mask->tests[SLIF_PLAYERS], mask->info.players ) )
 377                 return false;
 378         if( !_ServerList_CompareInt( info->isfavorite, mask->tests[SLIF_ISFAVORITE], mask->info.isfavorite ))
 379                 return false;
 380         return true;
 381 }
 382
 383 static void ServerList_ViewList_Insert( serverlist_entry_t *entry )
 384 {
 385         int start, end, mid, i;
 386         lhnetaddress_t addr;
 387
 388         // reject incompatible servers
 389         if(
 390                 entry->info.gameversion != gameversion.integer
 391                 &&
 392                 !(
 393                            gameversion_min.integer >= 0 // min/max range set by user/mod?
 394                         && gameversion_max.integer >= 0
 395                         && gameversion_min.integer >= entry->info.gameversion // version of server in min/max range?
 396                         && gameversion_max.integer <= entry->info.gameversion
 397                  )
 398         )
 399                 return;
 400
 401         // refresh the "favorite" status
 402         entry->info.isfavorite = false;
 403         if(LHNETADDRESS_FromString(&addr, entry->info.cname, 26000))
 404         {
 405                 for(i = 0; i < nFavorites; ++i)
 406                 {
 407                         if(LHNETADDRESS_Compare(&addr, &favorites[i]) == 0)
 408                         {
 409                                 entry->info.isfavorite = true;
 410                                 break;
 411                         }
 412                 }
 413         }
 414
 415         // FIXME: change this to be more readable (...)
 416         // now check whether it passes through the masks
 417         for( start = 0 ; start < SERVERLIST_ANDMASKCOUNT && serverlist_andmasks[start].active; start++ )
 418                 if( !_ServerList_Entry_Mask( &serverlist_andmasks[start], &entry->info ) )
 419                         return;
 420
 421         for( start = 0 ; start < SERVERLIST_ORMASKCOUNT && serverlist_ormasks[start].active ; start++ )
 422                 if( _ServerList_Entry_Mask( &serverlist_ormasks[start], &entry->info ) )
 423                         break;
 424         if( start == SERVERLIST_ORMASKCOUNT || (start > 0 && !serverlist_ormasks[start].active) )
 425                 return;
 426
 427         if( !serverlist_viewcount ) {
 428                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 429                 return;
 430         }
 431         // ok, insert it, we just need to find out where exactly:
 432
 433         // two special cases
 434         // check whether to insert it as new first item
 435         if( _ServerList_Entry_Compare( entry, ServerList_GetViewEntry(0) ) ) {
 436                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
 437                 return;
 438         } // check whether to insert it as new last item
 439         else if( !_ServerList_Entry_Compare( entry, ServerList_GetViewEntry(serverlist_viewcount - 1) ) ) {
 440                 _ServerList_ViewList_Helper_InsertBefore( serverlist_viewcount, entry );
 441                 return;
 442         }
 443         start = 0;
 444         end = serverlist_viewcount - 1;
 445         while( end > start + 1 )
 446         {
 447                 mid = (start + end) / 2;
 448                 // test the item that lies in the middle between start and end
 449                 if( _ServerList_Entry_Compare( entry, ServerList_GetViewEntry(mid) ) )
 450                         // the item has to be in the upper half
 451                         end = mid;
 452                 else
 453                         // the item has to be in the lower half
 454                         start = mid;
 455         }
 456         _ServerList_ViewList_Helper_InsertBefore( start + 1, entry );
 457 }
 458
 459 static void ServerList_ViewList_Remove( serverlist_entry_t *entry )
 460 {
 461         int i;
 462         for( i = 0; i < serverlist_viewcount; i++ )
 463         {
 464                 if (ServerList_GetViewEntry(i) == entry)
 465                 {
 466                         _ServerList_ViewList_Helper_Remove(i);
 467                         break;
 468                 }
 469         }
 470 }
 471
 472 void ServerList_RebuildViewList(void)
 473 {
 474         int i;
 475
 476         serverlist_viewcount = 0;
 477         for( i = 0 ; i < serverlist_cachecount ; i++ ) {
 478                 serverlist_entry_t *entry = &serverlist_cache[i];
 479                 // also display entries that are currently being refreshed [11/8/2007 Black]
 480                 if( entry->query == SQS_QUERIED || entry->query == SQS_REFRESHING )
 481                         ServerList_ViewList_Insert( entry );
 482         }
 483 }
 484
 485 void ServerList_ResetMasks(void)
 486 {
 487         int i;
 488
 489         memset( &serverlist_andmasks, 0, sizeof( serverlist_andmasks ) );
 490         memset( &serverlist_ormasks, 0, sizeof( serverlist_ormasks ) );
 491         // numbots needs to be compared to -1 to always succeed
 492         for(i = 0; i < SERVERLIST_ANDMASKCOUNT; ++i)
 493                 serverlist_andmasks[i].info.numbots = -1;
 494         for(i = 0; i < SERVERLIST_ORMASKCOUNT; ++i)
 495                 serverlist_ormasks[i].info.numbots = -1;
 496 }
 497
 498 void ServerList_GetPlayerStatistics(int *numplayerspointer, int *maxplayerspointer)
 499 {
 500         int i;
 501         int numplayers = 0, maxplayers = 0;
 502         for (i = 0;i < serverlist_cachecount;i++)
 503         {
 504                 if (serverlist_cache[i].query == SQS_QUERIED)
 505                 {
 506                         numplayers += serverlist_cache[i].info.numhumans;
 507                         maxplayers += serverlist_cache[i].info.maxplayers;
 508                 }
 509         }
 510         *numplayerspointer = numplayers;
 511         *maxplayerspointer = maxplayers;
 512 }
 513
 514 #if 0
 515 static void _ServerList_Test(void)
 516 {
 517         int i;
 518         if (serverlist_maxcachecount <= 1024)
 519         {
 520                 serverlist_maxcachecount = 1024;
 521                 serverlist_cache = (serverlist_entry_t *)Mem_Realloc(netconn_mempool, (void *)serverlist_cache, sizeof(serverlist_entry_t) * serverlist_maxcachecount);
 522         }
 523         for( i = 0 ; i < 1024 ; i++ ) {
 524                 memset( &serverlist_cache[serverlist_cachecount], 0, sizeof( serverlist_entry_t ) );
 525                 serverlist_cache[serverlist_cachecount].info.ping = 1000 + 1024 - i;
 526                 dpsnprintf( serverlist_cache[serverlist_cachecount].info.name, sizeof(serverlist_cache[serverlist_cachecount].info.name), "Black's ServerList Test %i", i );
 527                 serverlist_cache[serverlist_cachecount].finished = true;
 528                 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 );
 529                 ServerList_ViewList_Insert( &serverlist_cache[serverlist_cachecount] );
 530                 serverlist_cachecount++;
 531         }
 532 }
 533 #endif
 534
 535 void ServerList_QueryList(qboolean resetcache, qboolean querydp, qboolean queryqw, qboolean consoleoutput)
 536 {
 537         masterquerytime = realtime;
 538         masterquerycount = 0;
 539         masterreplycount = 0;
 540         if( resetcache ) {
 541                 serverquerycount = 0;
 542                 serverreplycount = 0;
 543                 serverlist_cachecount = 0;
 544                 serverlist_viewcount = 0;
 545                 serverlist_maxcachecount = 0;
 546                 serverlist_cache = (serverlist_entry_t *)Mem_Realloc(netconn_mempool, (void *)serverlist_cache, sizeof(serverlist_entry_t) * serverlist_maxcachecount);
 547         } else {
 548                 // refresh all entries
 549                 int n;
 550                 for( n = 0 ; n < serverlist_cachecount ; n++ ) {
 551                         serverlist_entry_t *entry = &serverlist_cache[ n ];
 552                         entry->query = SQS_REFRESHING;
 553                         entry->querycounter = 0;
 554                 }
 555         }
 556         serverlist_consoleoutput = consoleoutput;
 557
 558         //_ServerList_Test();
 559
 560         NetConn_QueryMasters(querydp, queryqw);
 561 }
 562
 563 // rest
 564
 565 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
 566 {
 567         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
 568         int i;
 569         if (length == 0)
 570                 return 0;
 571         if (cl_netpacketloss_receive.integer)
 572                 for (i = 0;i < cl_numsockets;i++)
 573                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss_receive.integer)
 574                                 return 0;
 575         if (developer_networking.integer)
 576         {
 577                 char addressstring[128], addressstring2[128];
 578                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 579                 if (length > 0)
 580                 {
 581                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 582                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", (void *)mysocket, addressstring, (void *)data, maxlength, (void *)peeraddress, length, addressstring2);
 583                         Com_HexDumpToConsole((unsigned char *)data, length);
 584                 }
 585                 else
 586                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", (void *)mysocket, addressstring, (void *)data, maxlength, (void *)peeraddress, length);
 587         }
 588         return length;
 589 }
 590
 591 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 592 {
 593         int ret;
 594         int i;
 595         if (cl_netpacketloss_send.integer)
 596                 for (i = 0;i < cl_numsockets;i++)
 597                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss_send.integer)
 598                                 return length;
 599         ret = LHNET_Write(mysocket, data, length, peeraddress);
 600         if (developer_networking.integer)
 601         {
 602                 char addressstring[128], addressstring2[128];
 603                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 604                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 605                 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)");
 606                 Com_HexDumpToConsole((unsigned char *)data, length);
 607         }
 608         return ret;
 609 }
 610
 611 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 612 {
 613         // note this does not include the trailing NULL because we add that in the parser
 614         return NetConn_Write(mysocket, string, (int)strlen(string), peeraddress);
 615 }
 616
 617 qboolean NetConn_CanSend(netconn_t *conn)
 618 {
 619         conn->outgoing_packetcounter = (conn->outgoing_packetcounter + 1) % NETGRAPH_PACKETS;
 620         conn->outgoing_netgraph[conn->outgoing_packetcounter].time            = realtime;
 621         conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes = NETGRAPH_NOPACKET;
 622         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
 623         conn->outgoing_netgraph[conn->outgoing_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
 624         if (realtime > conn->cleartime)
 625                 return true;
 626         else
 627         {
 628                 conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes = NETGRAPH_CHOKEDPACKET;
 629                 return false;
 630         }
 631 }
 632
 633 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data, protocolversion_t protocol, int rate, qboolean quakesignon_suppressreliables)
 634 {
 635         int totallen = 0;
 636
 637         // if this packet was supposedly choked, but we find ourselves sending one
 638         // anyway, make sure the size counting starts at zero
 639         // (this mostly happens on level changes and disconnects and such)
 640         if (conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes == NETGRAPH_CHOKEDPACKET)
 641                 conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes = NETGRAPH_NOPACKET;
 642
 643         if (protocol == PROTOCOL_QUAKEWORLD)
 644         {
 645                 int packetLen;
 646                 qboolean sendreliable;
 647
 648                 // note that it is ok to send empty messages to the qw server,
 649                 // otherwise it won't respond to us at all
 650
 651                 sendreliable = false;
 652                 // if the remote side dropped the last reliable message, resend it
 653                 if (conn->qw.incoming_acknowledged > conn->qw.last_reliable_sequence && conn->qw.incoming_reliable_acknowledged != conn->qw.reliable_sequence)
 654                         sendreliable = true;
 655                 // if the reliable transmit buffer is empty, copy the current message out
 656                 if (!conn->sendMessageLength && conn->message.cursize)
 657                 {
 658                         memcpy (conn->sendMessage, conn->message.data, conn->message.cursize);
 659                         conn->sendMessageLength = conn->message.cursize;
 660                         SZ_Clear(&conn->message); // clear the message buffer
 661                         conn->qw.reliable_sequence ^= 1;
 662                         sendreliable = true;
 663                 }
 664                 // outgoing unreliable packet number, and outgoing reliable packet number (0 or 1)
 665                 StoreLittleLong(sendbuffer, (unsigned int)conn->outgoing_unreliable_sequence | ((unsigned int)sendreliable<<31));
 666                 // last received unreliable packet number, and last received reliable packet number (0 or 1)
 667                 StoreLittleLong(sendbuffer + 4, (unsigned int)conn->qw.incoming_sequence | ((unsigned int)conn->qw.incoming_reliable_sequence<<31));
 668                 packetLen = 8;
 669                 conn->outgoing_unreliable_sequence++;
 670                 // client sends qport in every packet
 671                 if (conn == cls.netcon)
 672                 {
 673                         *((short *)(sendbuffer + 8)) = LittleShort(cls.qw_qport);
 674                         packetLen += 2;
 675                         // also update cls.qw_outgoing_sequence
 676                         cls.qw_outgoing_sequence = conn->outgoing_unreliable_sequence;
 677                 }
 678                 if (packetLen + (sendreliable ? conn->sendMessageLength : 0) > 1400)
 679                 {
 680                         Con_Printf ("NetConn_SendUnreliableMessage: reliable message too big %u\n", data->cursize);
 681                         return -1;
 682                 }
 683
 684                 conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes += packetLen + 28;
 685
 686                 // add the reliable message if there is one
 687                 if (sendreliable)
 688                 {
 689                         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes += conn->sendMessageLength + 28;
 690                         memcpy(sendbuffer + packetLen, conn->sendMessage, conn->sendMessageLength);
 691                         packetLen += conn->sendMessageLength;
 692                         conn->qw.last_reliable_sequence = conn->outgoing_unreliable_sequence;
 693                 }
 694
 695                 // add the unreliable message if possible
 696                 if (packetLen + data->cursize <= 1400)
 697                 {
 698                         conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes += data->cursize + 28;
 699                         memcpy(sendbuffer + packetLen, data->data, data->cursize);
 700                         packetLen += data->cursize;
 701                 }
 702
 703                 NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
 704
 705                 packetsSent++;
 706                 unreliableMessagesSent++;
 707
 708                 totallen += packetLen + 28;
 709         }
 710         else
 711         {
 712                 unsigned int packetLen;
 713                 unsigned int dataLen;
 714                 unsigned int eom;
 715
 716                 // if a reliable message fragment has been lost, send it again
 717                 if (conn->sendMessageLength && (realtime - conn->lastSendTime) > 1.0)
 718                 {
 719                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 720                         {
 721                                 dataLen = conn->sendMessageLength;
 722                                 eom = NETFLAG_EOM;
 723                         }
 724                         else
 725                         {
 726                                 dataLen = MAX_PACKETFRAGMENT;
 727                                 eom = 0;
 728                         }
 729
 730                         packetLen = NET_HEADERSIZE + dataLen;
 731
 732                         StoreBigLong(sendbuffer, packetLen | (NETFLAG_DATA | eom));
 733                         StoreBigLong(sendbuffer + 4, conn->nq.sendSequence - 1);
 734                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 735
 736                         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes += packetLen + 28;
 737
 738                         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) == (int)packetLen)
 739                         {
 740                                 conn->lastSendTime = realtime;
 741                                 packetsReSent++;
 742                         }
 743
 744                         totallen += packetLen + 28;
 745                 }
 746
 747                 // if we have a new reliable message to send, do so
 748                 if (!conn->sendMessageLength && conn->message.cursize && !quakesignon_suppressreliables)
 749                 {
 750                         if (conn->message.cursize > (int)sizeof(conn->sendMessage))
 751                         {
 752                                 Con_Printf("NetConn_SendUnreliableMessage: reliable message too big (%u > %u)\n", conn->message.cursize, (int)sizeof(conn->sendMessage));
 753                                 conn->message.overflowed = true;
 754                                 return -1;
 755                         }
 756
 757                         if (developer_networking.integer && conn == cls.netcon)
 758                         {
 759                                 Con_Print("client sending reliable message to server:\n");
 760                                 SZ_HexDumpToConsole(&conn->message);
 761                         }
 762
 763                         memcpy(conn->sendMessage, conn->message.data, conn->message.cursize);
 764                         conn->sendMessageLength = conn->message.cursize;
 765                         SZ_Clear(&conn->message);
 766
 767                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 768                         {
 769                                 dataLen = conn->sendMessageLength;
 770                                 eom = NETFLAG_EOM;
 771                         }
 772                         else
 773                         {
 774                                 dataLen = MAX_PACKETFRAGMENT;
 775                                 eom = 0;
 776                         }
 777
 778                         packetLen = NET_HEADERSIZE + dataLen;
 779
 780                         StoreBigLong(sendbuffer, packetLen | (NETFLAG_DATA | eom));
 781                         StoreBigLong(sendbuffer + 4, conn->nq.sendSequence);
 782                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 783
 784                         conn->nq.sendSequence++;
 785
 786                         conn->outgoing_netgraph[conn->outgoing_packetcounter].reliablebytes += packetLen + 28;
 787
 788                         NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
 789
 790                         conn->lastSendTime = realtime;
 791                         packetsSent++;
 792                         reliableMessagesSent++;
 793
 794                         totallen += packetLen + 28;
 795                 }
 796
 797                 // if we have an unreliable message to send, do so
 798                 if (data->cursize)
 799                 {
 800                         packetLen = NET_HEADERSIZE + data->cursize;
 801
 802                         if (packetLen > (int)sizeof(sendbuffer))
 803                         {
 804                                 Con_Printf("NetConn_SendUnreliableMessage: message too big %u\n", data->cursize);
 805                                 return -1;
 806                         }
 807
 808                         StoreBigLong(sendbuffer, packetLen | NETFLAG_UNRELIABLE);
 809                         StoreBigLong(sendbuffer + 4, conn->outgoing_unreliable_sequence);
 810                         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
 811
 812                         conn->outgoing_unreliable_sequence++;
 813
 814                         conn->outgoing_netgraph[conn->outgoing_packetcounter].unreliablebytes += packetLen + 28;
 815
 816                         NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
 817
 818                         packetsSent++;
 819                         unreliableMessagesSent++;
 820
 821                         totallen += packetLen + 28;
 822                 }
 823         }
 824
 825         // delay later packets to obey rate limit
 826         if (conn->cleartime < realtime - 0.1)
 827                 conn->cleartime = realtime - 0.1;
 828         conn->cleartime = conn->cleartime + (double)totallen / (double)rate;
 829         if (conn->cleartime < realtime)
 830                 conn->cleartime = realtime;
 831
 832         return 0;
 833 }
 834
 835 qboolean NetConn_HaveClientPorts(void)
 836 {
 837         return !!cl_numsockets;
 838 }
 839
 840 qboolean NetConn_HaveServerPorts(void)
 841 {
 842         return !!sv_numsockets;
 843 }
 844
 845 void NetConn_CloseClientPorts(void)
 846 {
 847         for (;cl_numsockets > 0;cl_numsockets--)
 848                 if (cl_sockets[cl_numsockets - 1])
 849                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 850 }
 851
 852 void NetConn_OpenClientPort(const char *addressstring, lhnetaddresstype_t addresstype, int defaultport)
 853 {
 854         lhnetaddress_t address;
 855         lhnetsocket_t *s;
 856         int success;
 857         char addressstring2[1024];
 858         if (addressstring && addressstring[0])
 859                 success = LHNETADDRESS_FromString(&address, addressstring, defaultport);
 860         else
 861                 success = LHNETADDRESS_FromPort(&address, addresstype, defaultport);
 862         if (success)
 863         {
 864                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 865                 {
 866                         cl_sockets[cl_numsockets++] = s;
 867                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 868                         if (addresstype != LHNETADDRESSTYPE_LOOP)
 869                                 Con_Printf("Client opened a socket on address %s\n", addressstring2);
 870                 }
 871                 else
 872                 {
 873                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 874                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
 875                 }
 876         }
 877         else
 878                 Con_Printf("Client unable to parse address %s\n", addressstring);
 879 }
 880
 881 void NetConn_OpenClientPorts(void)
 882 {
 883         int port;
 884         NetConn_CloseClientPorts();
 885         port = bound(0, cl_netport.integer, 65535);
 886         if (cl_netport.integer != port)
 887                 Cvar_SetValueQuick(&cl_netport, port);
 888         if(port == 0)
 889                 Con_Printf("Client using an automatically assigned port\n");
 890         else
 891                 Con_Printf("Client using port %i\n", port);
 892         NetConn_OpenClientPort(NULL, LHNETADDRESSTYPE_LOOP, 2);
 893         NetConn_OpenClientPort(net_address.string, LHNETADDRESSTYPE_INET4, port);
 894 #ifdef SUPPORTIPV6
 895         NetConn_OpenClientPort(net_address_ipv6.string, LHNETADDRESSTYPE_INET6, port);
 896 #endif
 897 }
 898
 899 void NetConn_CloseServerPorts(void)
 900 {
 901         for (;sv_numsockets > 0;sv_numsockets--)
 902                 if (sv_sockets[sv_numsockets - 1])
 903                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 904 }
 905
 906 qboolean NetConn_OpenServerPort(const char *addressstring, lhnetaddresstype_t addresstype, int defaultport, int range)
 907 {
 908         lhnetaddress_t address;
 909         lhnetsocket_t *s;
 910         int port;
 911         char addressstring2[1024];
 912         int success;
 913
 914         for (port = defaultport; port <= defaultport + range; port++)
 915         {
 916                 if (addressstring && addressstring[0])
 917                         success = LHNETADDRESS_FromString(&address, addressstring, port);
 918                 else
 919                         success = LHNETADDRESS_FromPort(&address, addresstype, port);
 920                 if (success)
 921                 {
 922                         if ((s = LHNET_OpenSocket_Connectionless(&address)))
 923                         {
 924                                 sv_sockets[sv_numsockets++] = s;
 925                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 926                                 if (addresstype != LHNETADDRESSTYPE_LOOP)
 927                                         Con_Printf("Server listening on address %s\n", addressstring2);
 928                                 return true;
 929                         }
 930                         else
 931                         {
 932                                 LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 933                                 Con_Printf("Server failed to open socket on address %s\n", addressstring2);
 934                         }
 935                 }
 936                 else
 937                 {
 938                         Con_Printf("Server unable to parse address %s\n", addressstring);
 939                         // if it cant parse one address, it wont be able to parse another for sure
 940                         return false;
 941                 }
 942         }
 943         return false;
 944 }
 945
 946 void NetConn_OpenServerPorts(int opennetports)
 947 {
 948         int port;
 949         NetConn_CloseServerPorts();
 950         NetConn_UpdateSockets();
 951         port = bound(0, sv_netport.integer, 65535);
 952         if (port == 0)
 953                 port = 26000;
 954         Con_Printf("Server using port %i\n", port);
 955         if (sv_netport.integer != port)
 956                 Cvar_SetValueQuick(&sv_netport, port);
 957         if (cls.state != ca_dedicated)
 958                 NetConn_OpenServerPort(NULL, LHNETADDRESSTYPE_LOOP, 1, 1);
 959         if (opennetports)
 960         {
 961 #ifdef SUPPORTIPV6
 962                 qboolean ip4success = NetConn_OpenServerPort(net_address.string, LHNETADDRESSTYPE_INET4, port, 100);
 963                 NetConn_OpenServerPort(net_address_ipv6.string, LHNETADDRESSTYPE_INET6, port, ip4success ? 1 : 100);
 964 #else
 965                 NetConn_OpenServerPort(net_address.string, LHNETADDRESSTYPE_INET4, port, 100);
 966 #endif
 967         }
 968         if (sv_numsockets == 0)
 969                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!");
 970 }
 971
 972 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 973 {
 974         int i, a = LHNETADDRESS_GetAddressType(address);
 975         for (i = 0;i < cl_numsockets;i++)
 976                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 977                         return cl_sockets[i];
 978         return NULL;
 979 }
 980
 981 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 982 {
 983         int i, a = LHNETADDRESS_GetAddressType(address);
 984         for (i = 0;i < sv_numsockets;i++)
 985                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 986                         return sv_sockets[i];
 987         return NULL;
 988 }
 989
 990 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 991 {
 992         netconn_t *conn;
 993         conn = (netconn_t *)Mem_Alloc(netconn_mempool, sizeof(*conn));
 994         conn->mysocket = mysocket;
 995         conn->peeraddress = *peeraddress;
 996         conn->lastMessageTime = realtime;
 997         conn->message.data = conn->messagedata;
 998         conn->message.maxsize = sizeof(conn->messagedata);
 999         conn->message.cursize = 0;
1000         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
1001         // reduce effectiveness of connection request floods
1002         conn->timeout = realtime + net_connecttimeout.value;
1003         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
1004         conn->next = netconn_list;
1005         netconn_list = conn;
1006         return conn;
1007 }
1008
1009 void NetConn_ClearConnectFlood(lhnetaddress_t *peeraddress);
1010 void NetConn_Close(netconn_t *conn)
1011 {
1012         netconn_t *c;
1013         // remove connection from list
1014
1015         // allow the client to reconnect immediately
1016         NetConn_ClearConnectFlood(&(conn->peeraddress));
1017
1018         if (conn == netconn_list)
1019                 netconn_list = conn->next;
1020         else
1021         {
1022                 for (c = netconn_list;c;c = c->next)
1023                 {
1024                         if (c->next == conn)
1025                         {
1026                                 c->next = conn->next;
1027                                 break;
1028                         }
1029                 }
1030                 // not found in list, we'll avoid crashing here...
1031                 if (!c)
1032                         return;
1033         }
1034         // free connection
1035         Mem_Free(conn);
1036 }
1037
1038 static int clientport = -1;
1039 static int clientport2 = -1;
1040 static int hostport = -1;
1041 void NetConn_UpdateSockets(void)
1042 {
1043         int i, j;
1044
1045         if (cls.state != ca_dedicated)
1046         {
1047                 if (clientport2 != cl_netport.integer)
1048                 {
1049                         clientport2 = cl_netport.integer;
1050                         if (cls.state == ca_connected)
1051                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
1052                 }
1053                 if (cls.state == ca_disconnected && clientport != clientport2)
1054                 {
1055                         clientport = clientport2;
1056                         NetConn_CloseClientPorts();
1057                 }
1058                 if (cl_numsockets == 0)
1059                         NetConn_OpenClientPorts();
1060         }
1061
1062         if (hostport != sv_netport.integer)
1063         {
1064                 hostport = sv_netport.integer;
1065                 if (sv.active)
1066                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
1067         }
1068
1069         for (j = 0;j < MAX_RCONS;j++)
1070         {
1071                 i = (cls.rcon_ringpos + j + 1) % MAX_RCONS;
1072                 if(cls.rcon_commands[i][0])
1073                 {
1074                         if(realtime > cls.rcon_timeout[i])
1075                         {
1076                                 char s[128];
1077                                 LHNETADDRESS_ToString(&cls.rcon_addresses[i], s, sizeof(s), true);
1078                                 Con_Printf("rcon to %s (for command %s) failed: challenge request timed out\n", s, cls.rcon_commands[i]);
1079                                 cls.rcon_commands[i][0] = 0;
1080                                 --cls.rcon_trying;
1081                                 break;
1082                         }
1083                 }
1084         }
1085 }
1086
1087 static int NetConn_ReceivedMessage(netconn_t *conn, unsigned char *data, int length, protocolversion_t protocol, double newtimeout)
1088 {
1089         int originallength = length;
1090         if (length < 8)
1091                 return 0;
1092
1093         if (protocol == PROTOCOL_QUAKEWORLD)
1094         {
1095                 int sequence, sequence_ack;
1096                 int reliable_ack, reliable_message;
1097                 int count;
1098                 //int qport;
1099
1100                 sequence = LittleLong(*((int *)(data + 0)));
1101                 sequence_ack = LittleLong(*((int *)(data + 4)));
1102                 data += 8;
1103                 length -= 8;
1104
1105                 if (conn != cls.netcon)
1106                 {
1107                         // server only
1108                         if (length < 2)
1109                                 return 0;
1110                         // 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?)
1111                         //qport = LittleShort(*((int *)(data + 8)));
1112                         data += 2;
1113                         length -= 2;
1114                 }
1115
1116                 packetsReceived++;
1117                 reliable_message = (sequence >> 31) & 1;
1118                 reliable_ack = (sequence_ack >> 31) & 1;
1119                 sequence &= ~(1<<31);
1120                 sequence_ack &= ~(1<<31);
1121                 if (sequence <= conn->qw.incoming_sequence)
1122                 {
1123                         //Con_DPrint("Got a stale datagram\n");
1124                         return 0;
1125                 }
1126                 count = sequence - (conn->qw.incoming_sequence + 1);
1127                 if (count > 0)
1128                 {
1129                         droppedDatagrams += count;
1130                         //Con_DPrintf("Dropped %u datagram(s)\n", count);
1131                         while (count--)
1132                         {
1133                                 conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1134                                 conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1135                                 conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = NETGRAPH_LOSTPACKET;
1136                                 conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1137                                 conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1138                         }
1139                 }
1140                 conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1141                 conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1142                 conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = originallength + 28;
1143                 conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1144                 conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1145                 if (reliable_ack == conn->qw.reliable_sequence)
1146                 {
1147                         // received, now we will be able to send another reliable message
1148                         conn->sendMessageLength = 0;
1149                         reliableMessagesReceived++;
1150                 }
1151                 conn->qw.incoming_sequence = sequence;
1152                 if (conn == cls.netcon)
1153                         cls.qw_incoming_sequence = conn->qw.incoming_sequence;
1154                 conn->qw.incoming_acknowledged = sequence_ack;
1155                 conn->qw.incoming_reliable_acknowledged = reliable_ack;
1156                 if (reliable_message)
1157                         conn->qw.incoming_reliable_sequence ^= 1;
1158                 conn->lastMessageTime = realtime;
1159                 conn->timeout = realtime + newtimeout;
1160                 unreliableMessagesReceived++;
1161                 SZ_Clear(&net_message);
1162                 SZ_Write(&net_message, data, length);
1163                 MSG_BeginReading();
1164                 return 2;
1165         }
1166         else
1167         {
1168                 unsigned int count;
1169                 unsigned int flags;
1170                 unsigned int sequence;
1171                 int qlength;
1172
1173                 qlength = (unsigned int)BuffBigLong(data);
1174                 flags = qlength & ~NETFLAG_LENGTH_MASK;
1175                 qlength &= NETFLAG_LENGTH_MASK;
1176                 // control packets were already handled
1177                 if (!(flags & NETFLAG_CTL) && qlength == length)
1178                 {
1179                         sequence = BuffBigLong(data + 4);
1180                         packetsReceived++;
1181                         data += 8;
1182                         length -= 8;
1183                         if (flags & NETFLAG_UNRELIABLE)
1184                         {
1185                                 if (sequence >= conn->nq.unreliableReceiveSequence)
1186                                 {
1187                                         if (sequence > conn->nq.unreliableReceiveSequence)
1188                                         {
1189                                                 count = sequence - conn->nq.unreliableReceiveSequence;
1190                                                 droppedDatagrams += count;
1191                                                 //Con_DPrintf("Dropped %u datagram(s)\n", count);
1192                                                 while (count--)
1193                                                 {
1194                                                         conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1195                                                         conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1196                                                         conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = NETGRAPH_LOSTPACKET;
1197                                                         conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1198                                                         conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1199                                                 }
1200                                         }
1201                                         conn->incoming_packetcounter = (conn->incoming_packetcounter + 1) % NETGRAPH_PACKETS;
1202                                         conn->incoming_netgraph[conn->incoming_packetcounter].time            = realtime;
1203                                         conn->incoming_netgraph[conn->incoming_packetcounter].unreliablebytes = originallength + 28;
1204                                         conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   = NETGRAPH_NOPACKET;
1205                                         conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes        = NETGRAPH_NOPACKET;
1206                                         conn->nq.unreliableReceiveSequence = sequence + 1;
1207                                         conn->lastMessageTime = realtime;
1208                                         conn->timeout = realtime + newtimeout;
1209                                         unreliableMessagesReceived++;
1210                                         if (length > 0)
1211                                         {
1212                                                 SZ_Clear(&net_message);
1213                                                 SZ_Write(&net_message, data, length);
1214                                                 MSG_BeginReading();
1215                                                 return 2;
1216                                         }
1217                                 }
1218                                 //else
1219                                 //      Con_DPrint("Got a stale datagram\n");
1220                                 return 1;
1221                         }
1222                         else if (flags & NETFLAG_ACK)
1223                         {
1224                                 conn->incoming_netgraph[conn->incoming_packetcounter].ackbytes += originallength + 28;
1225                                 if (sequence == (conn->nq.sendSequence - 1))
1226                                 {
1227                                         if (sequence == conn->nq.ackSequence)
1228                                         {
1229                                                 conn->nq.ackSequence++;
1230                                                 if (conn->nq.ackSequence != conn->nq.sendSequence)
1231                                                         Con_DPrint("ack sequencing error\n");
1232                                                 conn->lastMessageTime = realtime;
1233                                                 conn->timeout = realtime + newtimeout;
1234                                                 if (conn->sendMessageLength > MAX_PACKETFRAGMENT)
1235                                                 {
1236                                                         unsigned int packetLen;
1237                                                         unsigned int dataLen;
1238                                                         unsigned int eom;
1239
1240                                                         conn->sendMessageLength -= MAX_PACKETFRAGMENT;
1241                                                         memmove(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
1242
1243                                                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
1244                                                         {
1245                                                                 dataLen = conn->sendMessageLength;
1246                                                                 eom = NETFLAG_EOM;
1247                                                         }
1248                                                         else
1249                                                         {
1250                                                                 dataLen = MAX_PACKETFRAGMENT;
1251                                                                 eom = 0;
1252                                                         }
1253
1254                                                         packetLen = NET_HEADERSIZE + dataLen;
1255
1256                                                         StoreBigLong(sendbuffer, packetLen | (NETFLAG_DATA | eom));
1257                                                         StoreBigLong(sendbuffer + 4, conn->nq.sendSequence);
1258                                                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
1259
1260                                                         conn->nq.sendSequence++;
1261
1262                                                         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) == (int)packetLen)
1263                                                         {
1264                                                                 conn->lastSendTime = realtime;
1265                                                                 packetsSent++;
1266                                                         }
1267                                                 }
1268                                                 else
1269                                                         conn->sendMessageLength = 0;
1270                                         }
1271                                         //else
1272                                         //      Con_DPrint("Duplicate ACK received\n");
1273                                 }
1274                                 //else
1275                                 //      Con_DPrint("Stale ACK received\n");
1276                                 return 1;
1277                         }
1278                         else if (flags & NETFLAG_DATA)
1279                         {
1280                                 unsigned char temppacket[8];
1281                                 conn->incoming_netgraph[conn->incoming_packetcounter].reliablebytes   += originallength + 28;
1282                                 conn->outgoing_netgraph[conn->outgoing_packetcounter].ackbytes        += 8 + 28;
1283                                 StoreBigLong(temppacket, 8 | NETFLAG_ACK);
1284                                 StoreBigLong(temppacket + 4, sequence);
1285                                 NetConn_Write(conn->mysocket, (unsigned char *)temppacket, 8, &conn->peeraddress);
1286                                 if (sequence == conn->nq.receiveSequence)
1287                                 {
1288                                         conn->lastMessageTime = realtime;
1289                                         conn->timeout = realtime + newtimeout;
1290                                         conn->nq.receiveSequence++;
1291                                         if( conn->receiveMessageLength + length <= (int)sizeof( conn->receiveMessage ) ) {
1292                                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
1293                                                 conn->receiveMessageLength += length;
1294                                         } else {
1295                                                 Con_Printf( "Reliable message (seq: %i) too big for message buffer!\n"
1296                                                                         "Dropping the message!\n", sequence );
1297                                                 conn->receiveMessageLength = 0;
1298                                                 return 1;
1299                                         }
1300                                         if (flags & NETFLAG_EOM)
1301                                         {
1302                                                 reliableMessagesReceived++;
1303                                                 length = conn->receiveMessageLength;
1304                                                 conn->receiveMessageLength = 0;
1305                                                 if (length > 0)
1306                                                 {
1307                                                         SZ_Clear(&net_message);
1308                                                         SZ_Write(&net_message, conn->receiveMessage, length);
1309                                                         MSG_BeginReading();
1310                                                         return 2;
1311                                                 }
1312                                         }
1313                                 }
1314                                 else
1315                                         receivedDuplicateCount++;
1316                                 return 1;
1317                         }
1318                 }
1319         }
1320         return 0;
1321 }
1322
1323 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress, protocolversion_t initialprotocol)
1324 {
1325         cls.connect_trying = false;
1326         M_Update_Return_Reason("");
1327         // the connection request succeeded, stop current connection and set up a new connection
1328         CL_Disconnect();
1329         // if we're connecting to a remote server, shut down any local server
1330         if (LHNETADDRESS_GetAddressType(peeraddress) != LHNETADDRESSTYPE_LOOP && sv.active)
1331                 Host_ShutdownServer ();
1332         // allocate a net connection to keep track of things
1333         cls.netcon = NetConn_Open(mysocket, peeraddress);
1334         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
1335         key_dest = key_game;
1336         m_state = m_none;
1337         cls.demonum = -1;                       // not in the demo loop now
1338         cls.state = ca_connected;
1339         cls.signon = 0;                         // need all the signon messages before playing
1340         cls.protocol = initialprotocol;
1341         // reset move sequence numbering on this new connection
1342         cls.servermovesequence = 0;
1343         if (cls.protocol == PROTOCOL_QUAKEWORLD)
1344                 Cmd_ForwardStringToServer("new");
1345         if (cls.protocol == PROTOCOL_QUAKE)
1346         {
1347                 // write a keepalive (clc_nop) as it seems to greatly improve the
1348                 // chances of connecting to a netquake server
1349                 sizebuf_t msg;
1350                 unsigned char buf[4];
1351                 memset(&msg, 0, sizeof(msg));
1352                 msg.data = buf;
1353                 msg.maxsize = sizeof(buf);
1354                 MSG_WriteChar(&msg, clc_nop);
1355                 NetConn_SendUnreliableMessage(cls.netcon, &msg, cls.protocol, 10000, false);
1356         }
1357 }
1358
1359 int NetConn_IsLocalGame(void)
1360 {
1361         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
1362                 return true;
1363         return false;
1364 }
1365
1366 static int NetConn_ClientParsePacket_ServerList_ProcessReply(const char *addressstring)
1367 {
1368         int n;
1369         int pingtime;
1370         serverlist_entry_t *entry = NULL;
1371
1372         // search the cache for this server and update it
1373         for (n = 0;n < serverlist_cachecount;n++) {
1374                 entry = &serverlist_cache[ n ];
1375                 if (!strcmp(addressstring, entry->info.cname))
1376                         break;
1377         }
1378
1379         if (n == serverlist_cachecount)
1380         {
1381                 // LAN search doesnt require an answer from the master server so we wont
1382                 // know the ping nor will it be initialized already...
1383
1384                 // find a slot
1385                 if (serverlist_cachecount == SERVERLIST_TOTALSIZE)
1386                         return -1;
1387
1388                 if (serverlist_maxcachecount <= serverlist_cachecount)
1389                 {
1390                         serverlist_maxcachecount += 64;
1391                         serverlist_cache = (serverlist_entry_t *)Mem_Realloc(netconn_mempool, (void *)serverlist_cache, sizeof(serverlist_entry_t) * serverlist_maxcachecount);
1392                 }
1393                 entry = &serverlist_cache[n];
1394
1395                 memset(entry, 0, sizeof(*entry));
1396                 // store the data the engine cares about (address and ping)
1397                 strlcpy(entry->info.cname, addressstring, sizeof(entry->info.cname));
1398                 entry->info.ping = 100000;
1399                 entry->querytime = realtime;
1400                 // if not in the slist menu we should print the server to console
1401                 if (serverlist_consoleoutput)
1402                         Con_Printf("querying %s\n", addressstring);
1403                 ++serverlist_cachecount;
1404         }
1405         // if this is the first reply from this server, count it as having replied
1406         pingtime = (int)((realtime - entry->querytime) * 1000.0 + 0.5);
1407         pingtime = bound(0, pingtime, 9999);
1408         if (entry->query == SQS_REFRESHING) {
1409                 entry->info.ping = pingtime;
1410                 entry->query = SQS_QUERIED;
1411         } else {
1412                 // convert to unsigned to catch the -1
1413                 // 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]
1414                 entry->info.ping = min((unsigned) entry->info.ping, (unsigned) pingtime);
1415                 serverreplycount++;
1416         }
1417
1418         // other server info is updated by the caller
1419         return n;
1420 }
1421
1422 static void NetConn_ClientParsePacket_ServerList_UpdateCache(int n)
1423 {
1424         serverlist_entry_t *entry = &serverlist_cache[n];
1425         serverlist_info_t *info = &entry->info;
1426         // update description strings for engine menu and console output
1427         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);
1428         dpsnprintf(entry->line2, sizeof(serverlist_cache[n].line2), "^4%-21.21s %-19.19s ^%c%-17.17s^4 %-20.20s", info->cname, info->game,
1429                         (
1430                          info->gameversion != gameversion.integer
1431                          &&
1432                          !(
1433                                     gameversion_min.integer >= 0 // min/max range set by user/mod?
1434                                  && gameversion_max.integer >= 0
1435                                  && gameversion_min.integer >= info->gameversion // version of server in min/max range?
1436                                  && gameversion_max.integer <= info->gameversion
1437                           )
1438                         ) ? '1' : '4',
1439                         info->mod, info->map);
1440         if (entry->query == SQS_QUERIED)
1441         {
1442                 if(!serverlist_paused)
1443                         ServerList_ViewList_Remove(entry);
1444         }
1445         // if not in the slist menu we should print the server to console (if wanted)
1446         else if( serverlist_consoleoutput )
1447                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1448         // and finally, update the view set
1449         if(!serverlist_paused)
1450                 ServerList_ViewList_Insert( entry );
1451         //      update the entry's state
1452         serverlist_cache[n].query = SQS_QUERIED;
1453 }
1454
1455 // returns true, if it's sensible to continue the processing
1456 static qboolean NetConn_ClientParsePacket_ServerList_PrepareQuery( int protocol, const char *ipstring, qboolean isfavorite ) {
1457         int n;
1458         serverlist_entry_t *entry;
1459
1460         //      ignore the rest of the message if the serverlist is full
1461         if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1462                 return false;
1463         //      also ignore     it      if      we      have already queried    it      (other master server    response)
1464         for( n =        0 ; n   < serverlist_cachecount ; n++   )
1465                 if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1466                         break;
1467
1468         if( n < serverlist_cachecount ) {
1469                 // the entry has already been queried once or
1470                 return true;
1471         }
1472
1473         if (serverlist_maxcachecount <= n)
1474         {
1475                 serverlist_maxcachecount += 64;
1476                 serverlist_cache = (serverlist_entry_t *)Mem_Realloc(netconn_mempool, (void *)serverlist_cache, sizeof(serverlist_entry_t) * serverlist_maxcachecount);
1477         }
1478
1479         entry = &serverlist_cache[n];
1480
1481         memset(entry, 0, sizeof(entry));
1482         entry->protocol =       protocol;
1483         //      store   the data        the engine cares about (address and     ping)
1484         strlcpy (entry->info.cname, ipstring, sizeof(entry->info.cname));
1485
1486         entry->info.isfavorite = isfavorite;
1487
1488         // no, then reset the ping right away
1489         entry->info.ping = -1;
1490         // we also want to increase the serverlist_cachecount then
1491         serverlist_cachecount++;
1492         serverquerycount++;
1493
1494         entry->query =  SQS_QUERYING;
1495
1496         return true;
1497 }
1498
1499 static void NetConn_ClientParsePacket_ServerList_ParseDPList(lhnetaddress_t *senderaddress, const unsigned char *data, int length, qboolean isextended)
1500 {
1501         masterreplycount++;
1502         if (serverlist_consoleoutput)
1503                 Con_Printf("received DarkPlaces %sserver list...\n", isextended ? "extended " : "");
1504         while (length >= 7)
1505         {
1506                 char ipstring [128];
1507
1508                 // IPv4 address
1509                 if (data[0] == '\\')
1510                 {
1511                         unsigned short port = data[5] * 256 + data[6];
1512
1513                         if (port != 0 && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF))
1514                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%hu", data[1], data[2], data[3], data[4], port);
1515
1516                         // move on to next address in packet
1517                         data += 7;
1518                         length -= 7;
1519                 }
1520                 // IPv6 address
1521                 else if (data[0] == '/' && isextended && length >= 19)
1522                 {
1523                         unsigned short port = data[17] * 256 + data[18];
1524
1525                         if (port != 0)
1526                         {
1527                                 const char *ifname;
1528
1529                                 /// \TODO: make some basic checks of the IP address (broadcast, ...)
1530
1531 #ifdef WHY_JUST_WHY
1532                                 ifname = LHNETADDRESS_GetInterfaceName(senderaddress);
1533                                 if (ifname != NULL)
1534                                 {
1535                                         dpsnprintf (ipstring, sizeof (ipstring), "[%x:%x:%x:%x:%x:%x:%x:%x%%%s]:%hu",
1536                                                                 (data[1] << 8) | data[2], (data[3] << 8) | data[4], (data[5] << 8) | data[6], (data[7] << 8) | data[8],
1537                                                                 (data[9] << 8) | data[10], (data[11] << 8) | data[12], (data[13] << 8) | data[14], (data[15] << 8) | data[16],
1538                                                                 ifname, port);
1539                                 }
1540                                 else
1541 #endif
1542                                 {
1543                                         dpsnprintf (ipstring, sizeof (ipstring), "[%x:%x:%x:%x:%x:%x:%x:%x]:%hu",
1544                                                                 (data[1] << 8) | data[2], (data[3] << 8) | data[4], (data[5] << 8) | data[6], (data[7] << 8) | data[8],
1545                                                                 (data[9] << 8) | data[10], (data[11] << 8) | data[12], (data[13] << 8) | data[14], (data[15] << 8) | data[16],
1546                                                                 port);
1547                                 }
1548                         }
1549
1550                         // move on to next address in packet
1551                         data += 19;
1552                         length -= 19;
1553                 }
1554                 else
1555                 {
1556                         Con_Print("Error while parsing the server list\n");
1557                         break;
1558                 }
1559
1560                 if (serverlist_consoleoutput && developer_networking.integer)
1561                         Con_Printf("Requesting info from DarkPlaces server %s\n", ipstring);
1562
1563                 if( !NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_DARKPLACES7, ipstring, false ) ) {
1564                         break;
1565                 }
1566
1567         }
1568
1569         // begin or resume serverlist queries
1570         serverlist_querysleep = false;
1571         serverlist_querywaittime = realtime + 3;
1572 }
1573
1574 static int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1575 {
1576         qboolean fromserver;
1577         int ret, c, control;
1578         const char *s;
1579         char *string, addressstring2[128], ipstring[32];
1580         char stringbuf[16384];
1581
1582         // quakeworld ingame packet
1583         fromserver = cls.netcon && mysocket == cls.netcon->mysocket && !LHNETADDRESS_Compare(&cls.netcon->peeraddress, peeraddress);
1584
1585         // convert the address to a string incase we need it
1586         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1587
1588         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1589         {
1590                 // received a command string - strip off the packaging and put it
1591                 // into our string buffer with NULL termination
1592                 data += 4;
1593                 length -= 4;
1594                 length = min(length, (int)sizeof(stringbuf) - 1);
1595                 memcpy(stringbuf, data, length);
1596                 stringbuf[length] = 0;
1597                 string = stringbuf;
1598
1599                 if (developer_networking.integer)
1600                 {
1601                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
1602                         Com_HexDumpToConsole(data, length);
1603                 }
1604
1605                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.rcon_trying)
1606                 {
1607                         int i = 0, j;
1608                         for (j = 0;j < MAX_RCONS;j++)
1609                         {
1610                                 // note: this value from i is used outside the loop too...
1611                                 i = (cls.rcon_ringpos + j) % MAX_RCONS;
1612                                 if(cls.rcon_commands[i][0])
1613                                         if (!LHNETADDRESS_Compare(peeraddress, &cls.rcon_addresses[i]))
1614                                                 break;
1615                         }
1616                         if (j < MAX_RCONS)
1617                         {
1618                                 char buf[1500];
1619                                 char argbuf[1500];
1620                                 const char *e;
1621                                 int n;
1622                                 dpsnprintf(argbuf, sizeof(argbuf), "%s %s", string + 10, cls.rcon_commands[i]);
1623                                 memcpy(buf, "\377\377\377\377srcon HMAC-MD4 CHALLENGE ", 29);
1624
1625                                 e = strchr(rcon_password.string, ' ');
1626                                 n = e ? e-rcon_password.string : (int)strlen(rcon_password.string);
1627
1628                                 if(HMAC_MDFOUR_16BYTES((unsigned char *) (buf + 29), (unsigned char *) argbuf, strlen(argbuf), (unsigned char *) rcon_password.string, n))
1629                                 {
1630                                         int k;
1631                                         buf[45] = ' ';
1632                                         strlcpy(buf + 46, argbuf, sizeof(buf) - 46);
1633                                         NetConn_Write(mysocket, buf, 46 + strlen(buf + 46), peeraddress);
1634                                         cls.rcon_commands[i][0] = 0;
1635                                         --cls.rcon_trying;
1636
1637                                         for (k = 0;k < MAX_RCONS;k++)
1638                                                 if(cls.rcon_commands[k][0])
1639                                                         if (!LHNETADDRESS_Compare(peeraddress, &cls.rcon_addresses[k]))
1640                                                                 break;
1641                                         if(k < MAX_RCONS)
1642                                         {
1643                                                 int l;
1644                                                 NetConn_WriteString(mysocket, "\377\377\377\377getchallenge", peeraddress);
1645                                                 // extend the timeout on other requests as we asked for a challenge
1646                                                 for (l = 0;l < MAX_RCONS;l++)
1647                                                         if(cls.rcon_commands[l][0])
1648                                                                 if (!LHNETADDRESS_Compare(peeraddress, &cls.rcon_addresses[l]))
1649                                                                         cls.rcon_timeout[l] = realtime + rcon_secure_challengetimeout.value;
1650                                         }
1651
1652                                         return true; // we used up the challenge, so we can't use this oen for connecting now anyway
1653                                 }
1654                         }
1655                 }
1656                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
1657                 {
1658                         // darkplaces or quake3
1659                         char protocolnames[1400];
1660                         Protocol_Names(protocolnames, sizeof(protocolnames));
1661                         Con_DPrintf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
1662                         M_Update_Return_Reason("Got challenge response");
1663                         // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1664                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1665                         // TODO: add userinfo stuff here instead of using NQ commands?
1666                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\protocols\\%s%s\\challenge\\%s", protocolnames, cls.connect_userinfo, string + 10), peeraddress);
1667                         return true;
1668                 }
1669                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
1670                 {
1671                         // darkplaces or quake3
1672                         M_Update_Return_Reason("Accepted");
1673                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_DARKPLACES3);
1674                         return true;
1675                 }
1676                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
1677                 {
1678                         char rejectreason[32];
1679                         cls.connect_trying = false;
1680                         string += 7;
1681                         length = min(length - 7, (int)sizeof(rejectreason) - 1);
1682                         memcpy(rejectreason, string, length);
1683                         rejectreason[length] = 0;
1684                         M_Update_Return_Reason(rejectreason);
1685                         return true;
1686                 }
1687                 if (length >= 15 && !memcmp(string, "statusResponse\x0A", 15))
1688                 {
1689                         serverlist_info_t *info;
1690                         char *p;
1691                         int n;
1692
1693                         string += 15;
1694                         // search the cache for this server and update it
1695                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1696                         if (n < 0)
1697                                 return true;
1698
1699                         info = &serverlist_cache[n].info;
1700                         info->game[0] = 0;
1701                         info->mod[0]  = 0;
1702                         info->map[0]  = 0;
1703                         info->name[0] = 0;
1704                         info->qcstatus[0] = 0;
1705                         info->players[0] = 0;
1706                         info->protocol = -1;
1707                         info->numplayers = 0;
1708                         info->numbots = -1;
1709                         info->maxplayers  = 0;
1710                         info->gameversion = 0;
1711
1712                         p = strchr(string, '\n');
1713                         if(p)
1714                         {
1715                                 *p = 0; // cut off the string there
1716                                 ++p;
1717                         }
1718                         else
1719                                 Con_Printf("statusResponse without players block?\n");
1720
1721                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));
1722                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));
1723                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));
1724                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));
1725                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);
1726                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);
1727                         if ((s = SearchInfostring(string, "bots"         )) != NULL) info->numbots = atoi(s);
1728                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);
1729                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);
1730                         if ((s = SearchInfostring(string, "qcstatus"     )) != NULL) strlcpy(info->qcstatus, s, sizeof(info->qcstatus));
1731                         if (p                                               != NULL) strlcpy(info->players, p, sizeof(info->players));
1732                         info->numhumans = info->numplayers - max(0, info->numbots);
1733                         info->freeslots = info->maxplayers - info->numplayers;
1734
1735                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1736
1737                         return true;
1738                 }
1739                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1740                 {
1741                         serverlist_info_t *info;
1742                         int n;
1743
1744                         string += 13;
1745                         // search the cache for this server and update it
1746                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1747                         if (n < 0)
1748                                 return true;
1749
1750                         info = &serverlist_cache[n].info;
1751                         info->game[0] = 0;
1752                         info->mod[0]  = 0;
1753                         info->map[0]  = 0;
1754                         info->name[0] = 0;
1755                         info->qcstatus[0] = 0;
1756                         info->players[0] = 0;
1757                         info->protocol = -1;
1758                         info->numplayers = 0;
1759                         info->numbots = -1;
1760                         info->maxplayers  = 0;
1761                         info->gameversion = 0;
1762
1763                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));
1764                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));
1765                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));
1766                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));
1767                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);
1768                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);
1769                         if ((s = SearchInfostring(string, "bots"         )) != NULL) info->numbots = atoi(s);
1770                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);
1771                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);
1772                         if ((s = SearchInfostring(string, "qcstatus"     )) != NULL) strlcpy(info->qcstatus, s, sizeof(info->qcstatus));
1773                         info->numhumans = info->numplayers - max(0, info->numbots);
1774                         info->freeslots = info->maxplayers - info->numplayers;
1775
1776                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1777
1778                         return true;
1779                 }
1780                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1781                 {
1782                         // Extract the IP addresses
1783                         data += 18;
1784                         length -= 18;
1785                         NetConn_ClientParsePacket_ServerList_ParseDPList(peeraddress, data, length, false);
1786                         return true;
1787                 }
1788                 if (!strncmp(string, "getserversExtResponse", 21) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1789                 {
1790                         // Extract the IP addresses
1791                         data += 21;
1792                         length -= 21;
1793                         NetConn_ClientParsePacket_ServerList_ParseDPList(peeraddress, data, length, true);
1794                         return true;
1795                 }
1796                 if (!memcmp(string, "d\n", 2) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1797                 {
1798                         // Extract the IP addresses
1799                         data += 2;
1800                         length -= 2;
1801                         masterreplycount++;
1802                         if (serverlist_consoleoutput)
1803                                 Con_Printf("received QuakeWorld server list from %s...\n", addressstring2);
1804                         while (length >= 6 && (data[0] != 0xFF || data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF) && data[4] * 256 + data[5] != 0)
1805                         {
1806                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[0], data[1], data[2], data[3], data[4] * 256 + data[5]);
1807                                 if (serverlist_consoleoutput && developer_networking.integer)
1808                                         Con_Printf("Requesting info from QuakeWorld server %s\n", ipstring);
1809
1810                                 if( !NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_QUAKEWORLD, ipstring, false ) ) {
1811                                         break;
1812                                 }
1813
1814                                 // move on to next address in packet
1815                                 data += 6;
1816                                 length -= 6;
1817                         }
1818                         // begin or resume serverlist queries
1819                         serverlist_querysleep = false;
1820                         serverlist_querywaittime = realtime + 3;
1821                         return true;
1822                 }
1823                 if (!strncmp(string, "extResponse ", 12))
1824                 {
1825                         ++cl_net_extresponse_count;
1826                         if(cl_net_extresponse_count > NET_EXTRESPONSE_MAX)
1827                                 cl_net_extresponse_count = NET_EXTRESPONSE_MAX;
1828                         cl_net_extresponse_last = (cl_net_extresponse_last + 1) % NET_EXTRESPONSE_MAX;
1829                         dpsnprintf(cl_net_extresponse[cl_net_extresponse_last], sizeof(cl_net_extresponse[cl_net_extresponse_last]), "\"%s\" %s", addressstring2, string + 12);
1830                         return true;
1831                 }
1832                 if (!strncmp(string, "ping", 4))
1833                 {
1834                         if (developer_extra.integer)
1835                                 Con_DPrintf("Received ping from %s, sending ack\n", addressstring2);
1836                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1837                         return true;
1838                 }
1839                 if (!strncmp(string, "ack", 3))
1840                         return true;
1841                 // QuakeWorld compatibility
1842                 if (length > 1 && string[0] == 'c' && (string[1] == '-' || (string[1] >= '0' && string[1] <= '9')) && cls.connect_trying)
1843                 {
1844                         // challenge message
1845                         Con_Printf("challenge %s received, sending QuakeWorld connect request back to %s\n", string + 1, addressstring2);
1846                         M_Update_Return_Reason("Got QuakeWorld challenge response");
1847                         cls.qw_qport = qport.integer;
1848                         // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1849                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1850                         NetConn_WriteString(mysocket, va("\377\377\377\377connect %i %i %i \"%s%s\"\n", 28, cls.qw_qport, atoi(string + 1), cls.userinfo, cls.connect_userinfo), peeraddress);
1851                         return true;
1852                 }
1853                 if (length >= 1 && string[0] == 'j' && cls.connect_trying)
1854                 {
1855                         // accept message
1856                         M_Update_Return_Reason("QuakeWorld Accepted");
1857                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_QUAKEWORLD);
1858                         return true;
1859                 }
1860                 if (length > 2 && !memcmp(string, "n\\", 2))
1861                 {
1862                         serverlist_info_t *info;
1863                         int n;
1864
1865                         // qw server status
1866                         if (serverlist_consoleoutput && developer_networking.integer >= 2)
1867                                 Con_Printf("QW server status from server at %s:\n%s\n", addressstring2, string + 1);
1868
1869                         string += 1;
1870                         // search the cache for this server and update it
1871                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1872                         if (n < 0)
1873                                 return true;
1874
1875                         info = &serverlist_cache[n].info;
1876                         strlcpy(info->game, "QuakeWorld", sizeof(info->game));
1877                         if ((s = SearchInfostring(string, "*gamedir"     )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1878                         if ((s = SearchInfostring(string, "map"          )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1879                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1880                         info->protocol = 0;
1881                         info->numplayers = 0; // updated below
1882                         info->numhumans = 0; // updated below
1883                         if ((s = SearchInfostring(string, "maxclients"   )) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1884                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);else info->gameversion = 0;
1885
1886                         // count active players on server
1887                         // (we could gather more info, but we're just after the number)
1888                         s = strchr(string, '\n');
1889                         if (s)
1890                         {
1891                                 s++;
1892                                 while (s < string + length)
1893                                 {
1894                                         for (;s < string + length && *s != '\n';s++)
1895                                                 ;
1896                                         if (s >= string + length)
1897                                                 break;
1898                                         info->numplayers++;
1899                                         info->numhumans++;
1900                                         s++;
1901                                 }
1902                         }
1903
1904                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1905
1906                         return true;
1907                 }
1908                 if (string[0] == 'n')
1909                 {
1910                         // qw print command
1911                         Con_Printf("QW print command from server at %s:\n%s\n", addressstring2, string + 1);
1912                 }
1913                 // we may not have liked the packet, but it was a command packet, so
1914                 // we're done processing this packet now
1915                 return true;
1916         }
1917         // quakeworld ingame packet
1918         if (fromserver && cls.protocol == PROTOCOL_QUAKEWORLD && length >= 8 && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol, net_messagetimeout.value)) == 2)
1919         {
1920                 ret = 0;
1921                 CL_ParseServerMessage();
1922                 return ret;
1923         }
1924         // netquake control packets, supported for compatibility only
1925         if (length >= 5 && (control = BuffBigLong(data)) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1926         {
1927                 int n;
1928                 serverlist_info_t *info;
1929
1930                 data += 4;
1931                 length -= 4;
1932                 SZ_Clear(&net_message);
1933                 SZ_Write(&net_message, data, length);
1934                 MSG_BeginReading();
1935                 c = MSG_ReadByte();
1936                 switch (c)
1937                 {
1938                 case CCREP_ACCEPT:
1939                         if (developer_extra.integer)
1940                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
1941                         if (cls.connect_trying)
1942                         {
1943                                 lhnetaddress_t clientportaddress;
1944                                 clientportaddress = *peeraddress;
1945                                 LHNETADDRESS_SetPort(&clientportaddress, MSG_ReadLong());
1946                                 // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1947                                 InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1948                                 M_Update_Return_Reason("Accepted");
1949                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress, PROTOCOL_QUAKE);
1950                         }
1951                         break;
1952                 case CCREP_REJECT:
1953                         if (developer_extra.integer)
1954                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1955                         cls.connect_trying = false;
1956                         M_Update_Return_Reason((char *)MSG_ReadString());
1957                         break;
1958                 case CCREP_SERVER_INFO:
1959                         if (developer_extra.integer)
1960                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1961                         // LordHavoc: because the quake server may report weird addresses
1962                         // we just ignore it and keep the real address
1963                         MSG_ReadString();
1964                         // search the cache for this server and update it
1965                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1966                         if (n < 0)
1967                                 break;
1968
1969                         info = &serverlist_cache[n].info;
1970                         strlcpy(info->game, "Quake", sizeof(info->game));
1971                         strlcpy(info->mod , "", sizeof(info->mod)); // mod name is not specified
1972                         strlcpy(info->name, MSG_ReadString(), sizeof(info->name));
1973                         strlcpy(info->map , MSG_ReadString(), sizeof(info->map));
1974                         info->numplayers = MSG_ReadByte();
1975                         info->maxplayers = MSG_ReadByte();
1976                         info->protocol = MSG_ReadByte();
1977
1978                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1979
1980                         break;
1981                 case CCREP_RCON: // RocketGuy: ProQuake rcon support
1982                         if (developer_extra.integer)
1983                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREP_RCON from %s.\n", addressstring2);
1984
1985                         Con_Printf("%s\n", MSG_ReadString());
1986                         break;
1987                 case CCREP_PLAYER_INFO:
1988                         // we got a CCREP_PLAYER_INFO??
1989                         //if (developer_extra.integer)
1990                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1991                         break;
1992                 case CCREP_RULE_INFO:
1993                         // we got a CCREP_RULE_INFO??
1994                         //if (developer_extra.integer)
1995                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1996                         break;
1997                 default:
1998                         break;
1999                 }
2000                 SZ_Clear(&net_message);
2001                 // we may not have liked the packet, but it was a valid control
2002                 // packet, so we're done processing this packet now
2003                 return true;
2004         }
2005         ret = 0;
2006         if (fromserver && length >= (int)NET_HEADERSIZE && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol, net_messagetimeout.value)) == 2)
2007                 CL_ParseServerMessage();
2008         return ret;
2009 }
2010
2011 void NetConn_QueryQueueFrame(void)
2012 {
2013         int index;
2014         int queries;
2015         int maxqueries;
2016         double timeouttime;
2017         static double querycounter = 0;
2018
2019         if(!net_slist_pause.integer && serverlist_paused)
2020                 ServerList_RebuildViewList();
2021         serverlist_paused = net_slist_pause.integer != 0;
2022
2023         if (serverlist_querysleep)
2024                 return;
2025
2026         // apply a cool down time after master server replies,
2027         // to avoid messing up the ping times on the servers
2028         if (serverlist_querywaittime > realtime)
2029                 return;
2030
2031         // each time querycounter reaches 1.0 issue a query
2032         querycounter += cl.realframetime * net_slist_queriespersecond.value;
2033         maxqueries = (int)querycounter;
2034         maxqueries = bound(0, maxqueries, net_slist_queriesperframe.integer);
2035         querycounter -= maxqueries;
2036
2037         if( maxqueries == 0 ) {
2038                 return;
2039         }
2040
2041         //      scan serverlist and issue queries as needed
2042         serverlist_querysleep = true;
2043
2044         timeouttime     = realtime - net_slist_timeout.value;
2045         for( index = 0, queries = 0 ;   index   < serverlist_cachecount &&      queries < maxqueries    ; index++ )
2046         {
2047                 serverlist_entry_t *entry = &serverlist_cache[ index ];
2048                 if( entry->query != SQS_QUERYING && entry->query != SQS_REFRESHING )
2049                 {
2050                         continue;
2051                 }
2052
2053                 serverlist_querysleep   = false;
2054                 if( entry->querycounter !=      0 && entry->querytime > timeouttime     )
2055                 {
2056                         continue;
2057                 }
2058
2059                 if( entry->querycounter !=      (unsigned) net_slist_maxtries.integer )
2060                 {
2061                         lhnetaddress_t  address;
2062                         int socket;
2063
2064                         LHNETADDRESS_FromString(&address, entry->info.cname, 0);
2065                         if      (entry->protocol == PROTOCOL_QUAKEWORLD)
2066                         {
2067                                 for (socket     = 0; socket     < cl_numsockets ;       socket++)
2068                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377status\n", &address);
2069                         }
2070                         else
2071                         {
2072                                 for (socket     = 0; socket     < cl_numsockets ;       socket++)
2073                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377getstatus", &address);
2074                         }
2075
2076                         //      update the entry fields
2077                         entry->querytime = realtime;
2078                         entry->querycounter++;
2079
2080                         // if not in the slist menu we should print the server to console
2081                         if (serverlist_consoleoutput)
2082                                 Con_Printf("querying %25s (%i. try)\n", entry->info.cname, entry->querycounter);
2083
2084                         queries++;
2085                 }
2086                 else
2087                 {
2088                         // have we tried to refresh this server?
2089                         if( entry->query == SQS_REFRESHING ) {
2090                                 // yes, so update the reply count (since its not responding anymore)
2091                                 serverreplycount--;
2092                                 if(!serverlist_paused)
2093                                         ServerList_ViewList_Remove(entry);
2094                         }
2095                         entry->query = SQS_TIMEDOUT;
2096                 }
2097         }
2098 }
2099
2100 void NetConn_ClientFrame(void)
2101 {
2102         int i, length;
2103         lhnetaddress_t peeraddress;
2104         NetConn_UpdateSockets();
2105         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
2106         {
2107                 if (cls.connect_remainingtries == 0)
2108                         M_Update_Return_Reason("Connect: Waiting 10 seconds for reply");
2109                 cls.connect_nextsendtime = realtime + 1;
2110                 cls.connect_remainingtries--;
2111                 if (cls.connect_remainingtries <= -10)
2112                 {
2113                         cls.connect_trying = false;
2114                         M_Update_Return_Reason("Connect: Failed");
2115                         return;
2116                 }
2117                 // try challenge first (newer DP server or QW)
2118                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
2119                 // then try netquake as a fallback (old server, or netquake)
2120                 SZ_Clear(&net_message);
2121                 // save space for the header, filled in later
2122                 MSG_WriteLong(&net_message, 0);
2123                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
2124                 MSG_WriteString(&net_message, "QUAKE");
2125                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
2126                 StoreBigLong(net_message.data, NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2127                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
2128                 SZ_Clear(&net_message);
2129         }
2130         for (i = 0;i < cl_numsockets;i++)
2131         {
2132                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
2133                 {
2134 //                      R_TimeReport("clientreadnetwork");
2135                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
2136 //                      R_TimeReport("clientparsepacket");
2137                 }
2138         }
2139         NetConn_QueryQueueFrame();
2140         if (cls.netcon && realtime > cls.netcon->timeout && !sv.active)
2141         {
2142                 Con_Print("Connection timed out\n");
2143                 CL_Disconnect();
2144                 Host_ShutdownServer ();
2145         }
2146 }
2147
2148 #define MAX_CHALLENGES 128
2149 struct challenge_s
2150 {
2151         lhnetaddress_t address;
2152         double time;
2153         char string[12];
2154 }
2155 challenge[MAX_CHALLENGES];
2156
2157 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
2158 {
2159         int i;
2160         char c;
2161         for (i = 0;i < bufferlength - 1;i++)
2162         {
2163                 do
2164                 {
2165                         c = rand () % (127 - 33) + 33;
2166                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
2167                 buffer[i] = c;
2168         }
2169         buffer[i] = 0;
2170 }
2171
2172 /// (div0) build the full response only if possible; better a getinfo response than no response at all if getstatus won't fit
2173 static qboolean NetConn_BuildStatusResponse(const char* challenge, char* out_msg, size_t out_size, qboolean fullstatus)
2174 {
2175         char qcstatus[256];
2176         unsigned int nb_clients = 0, nb_bots = 0, i;
2177         int length;
2178         char teambuf[3];
2179
2180         SV_VM_Begin();
2181
2182         // How many clients are there?
2183         for (i = 0;i < (unsigned int)svs.maxclients;i++)
2184         {
2185                 if (svs.clients[i].active)
2186                 {
2187                         nb_clients++;
2188                         if (!svs.clients[i].netconnection)
2189                                 nb_bots++;
2190                 }
2191         }
2192
2193         *qcstatus = 0;
2194         if(prog->globaloffsets.worldstatus >= 0)
2195         {
2196                 const char *str = PRVM_G_STRING(prog->globaloffsets.worldstatus);
2197                 if(str && *str)
2198                 {
2199                         char *p;
2200                         const char *q;
2201                         p = qcstatus;
2202                         for(q = str; *q; ++q)
2203                                 if(*q != '\\' && *q != '\n')
2204                                         *p++ = *q;
2205                         *p = 0;
2206                 }
2207         }
2208
2209         /// \TODO: we should add more information for the full status string
2210         length = dpsnprintf(out_msg, out_size,
2211                                                 "\377\377\377\377%s\x0A"
2212                                                 "\\gamename\\%s\\modname\\%s\\gameversion\\%d\\sv_maxclients\\%d"
2213                                                 "\\clients\\%d\\bots\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d"
2214                                                 "%s%s"
2215                                                 "%s%s"
2216                                                 "%s",
2217                                                 fullstatus ? "statusResponse" : "infoResponse",
2218                                                 gamename, com_modname, gameversion.integer, svs.maxclients,
2219                                                 nb_clients, nb_bots, sv.worldbasename, hostname.string, NET_PROTOCOL_VERSION,
2220                                                 *qcstatus ? "\\qcstatus\\" : "", qcstatus,
2221                                                 challenge ? "\\challenge\\" : "", challenge ? challenge : "",
2222                                                 fullstatus ? "\n" : "");
2223
2224         // Make sure it fits in the buffer
2225         if (length < 0)
2226                 goto bad;
2227
2228         if (fullstatus)
2229         {
2230                 char *ptr;
2231                 int left;
2232                 int savelength;
2233
2234                 savelength = length;
2235
2236                 ptr = out_msg + length;
2237                 left = (int)out_size - length;
2238
2239                 for (i = 0;i < (unsigned int)svs.maxclients;i++)
2240                 {
2241                         client_t *cl = &svs.clients[i];
2242                         if (cl->active)
2243                         {
2244                                 int nameind, cleanind, pingvalue;
2245                                 char curchar;
2246                                 char cleanname [sizeof(cl->name)];
2247
2248                                 // Remove all characters '"' and '\' in the player name
2249                                 nameind = 0;
2250                                 cleanind = 0;
2251                                 do
2252                                 {
2253                                         curchar = cl->name[nameind++];
2254                                         if (curchar != '"' && curchar != '\\')
2255                                         {
2256                                                 cleanname[cleanind++] = curchar;
2257                                                 if (cleanind == sizeof(cleanname) - 1)
2258                                                         break;
2259                                         }
2260                                 } while (curchar != '\0');
2261                                 cleanname[cleanind] = 0; // cleanind is always a valid index even at this point
2262
2263                                 pingvalue = (int)(cl->ping * 1000.0f);
2264                                 if(cl->netconnection)
2265                                         pingvalue = bound(1, pingvalue, 9999);
2266                                 else
2267                                         pingvalue = 0;
2268
2269                                 *qcstatus = 0;
2270                                 if(prog->fieldoffsets.clientstatus >= 0)
2271                                 {
2272                                         const char *str = PRVM_E_STRING(PRVM_EDICT_NUM(i + 1), prog->fieldoffsets.clientstatus);
2273                                         if(str && *str)
2274                                         {
2275                                                 char *p;
2276                                                 const char *q;
2277                                                 p = qcstatus;
2278                                                 for(q = str; *q && p != qcstatus + sizeof(qcstatus) - 1; ++q)
2279                                                         if(*q != '\\' && *q != '"' && !ISWHITESPACE(*q))
2280                                                                 *p++ = *q;
2281                                                 *p = 0;
2282                                         }
2283                                 }
2284
2285                                 if ((gamemode == GAME_NEXUIZ || gamemode == GAME_XONOTIC) && (teamplay.integer > 0))
2286                                 {
2287                                         if(cl->frags == -666) // spectator
2288                                                 strlcpy(teambuf, " 0", sizeof(teambuf));
2289                                         else if(cl->colors == 0x44) // red team
2290                                                 strlcpy(teambuf, " 1", sizeof(teambuf));
2291                                         else if(cl->colors == 0xDD) // blue team
2292                                                 strlcpy(teambuf, " 2", sizeof(teambuf));
2293                                         else if(cl->colors == 0xCC) // yellow team
2294                                                 strlcpy(teambuf, " 3", sizeof(teambuf));
2295                                         else if(cl->colors == 0x99) // pink team
2296                                                 strlcpy(teambuf, " 4", sizeof(teambuf));
2297                                         else
2298                                                 strlcpy(teambuf, " 0", sizeof(teambuf));
2299                                 }
2300                                 else
2301                                         *teambuf = 0;
2302
2303                                 // note: team number is inserted according to SoF2 protocol
2304                                 if(*qcstatus)
2305                                         length = dpsnprintf(ptr, left, "%s %d%s \"%s\"\n",
2306                                                                                 qcstatus,
2307                                                                                 pingvalue,
2308                                                                                 teambuf,
2309                                                                                 cleanname);
2310                                 else
2311                                         length = dpsnprintf(ptr, left, "%d %d%s \"%s\"\n",
2312                                                                                 cl->frags,
2313                                                                                 pingvalue,
2314                                                                                 teambuf,
2315                                                                                 cleanname);
2316
2317                                 if(length < 0)
2318                                 {
2319                                         // out of space?
2320                                         // turn it into an infoResponse!
2321                                         out_msg[savelength] = 0;
2322                                         memcpy(out_msg + 4, "infoResponse\x0A", 13);
2323                                         memmove(out_msg + 17, out_msg + 19, savelength - 19);
2324                                         break;
2325                                 }
2326                                 left -= length;
2327                                 ptr += length;
2328                         }
2329                 }
2330         }
2331
2332         SV_VM_End();
2333         return true;
2334
2335 bad:
2336         SV_VM_End();
2337         return false;
2338 }
2339
2340 static qboolean NetConn_PreventConnectFlood(lhnetaddress_t *peeraddress)
2341 {
2342         int floodslotnum, bestfloodslotnum;
2343         double bestfloodtime;
2344         lhnetaddress_t noportpeeraddress;
2345         // see if this is a connect flood
2346         noportpeeraddress = *peeraddress;
2347         LHNETADDRESS_SetPort(&noportpeeraddress, 0);
2348         bestfloodslotnum = 0;
2349         bestfloodtime = sv.connectfloodaddresses[bestfloodslotnum].lasttime;
2350         for (floodslotnum = 0;floodslotnum < MAX_CONNECTFLOODADDRESSES;floodslotnum++)
2351         {
2352                 if (bestfloodtime >= sv.connectfloodaddresses[floodslotnum].lasttime)
2353                 {
2354                         bestfloodtime = sv.connectfloodaddresses[floodslotnum].lasttime;
2355                         bestfloodslotnum = floodslotnum;
2356                 }
2357                 if (sv.connectfloodaddresses[floodslotnum].lasttime && LHNETADDRESS_Compare(&noportpeeraddress, &sv.connectfloodaddresses[floodslotnum].address) == 0)
2358                 {
2359                         // this address matches an ongoing flood address
2360                         if (realtime < sv.connectfloodaddresses[floodslotnum].lasttime + net_connectfloodblockingtimeout.value)
2361                         {
2362                                 // renew the ban on this address so it does not expire
2363                                 // until the flood has subsided
2364                                 sv.connectfloodaddresses[floodslotnum].lasttime = realtime;
2365                                 //Con_Printf("Flood detected!\n");
2366                                 return true;
2367                         }
2368                         // the flood appears to have subsided, so allow this
2369                         bestfloodslotnum = floodslotnum; // reuse the same slot
2370                         break;
2371                 }
2372         }
2373         // begin a new timeout on this address
2374         sv.connectfloodaddresses[bestfloodslotnum].address = noportpeeraddress;
2375         sv.connectfloodaddresses[bestfloodslotnum].lasttime = realtime;
2376         //Con_Printf("Flood detection initiated!\n");
2377         return false;
2378 }
2379
2380 void NetConn_ClearConnectFlood(lhnetaddress_t *peeraddress)
2381 {
2382         int floodslotnum;
2383         lhnetaddress_t noportpeeraddress;
2384         // see if this is a connect flood
2385         noportpeeraddress = *peeraddress;
2386         LHNETADDRESS_SetPort(&noportpeeraddress, 0);
2387         for (floodslotnum = 0;floodslotnum < MAX_CONNECTFLOODADDRESSES;floodslotnum++)
2388         {
2389                 if (sv.connectfloodaddresses[floodslotnum].lasttime && LHNETADDRESS_Compare(&noportpeeraddress, &sv.connectfloodaddresses[floodslotnum].address) == 0)
2390                 {
2391                         // this address matches an ongoing flood address
2392                         // remove the ban
2393                         sv.connectfloodaddresses[floodslotnum].address.addresstype = LHNETADDRESSTYPE_NONE;
2394                         sv.connectfloodaddresses[floodslotnum].lasttime = 0;
2395                         //Con_Printf("Flood cleared!\n");
2396                 }
2397         }
2398 }
2399
2400 typedef qboolean (*rcon_matchfunc_t) (lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen);
2401
2402 qboolean hmac_mdfour_time_matching(lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen)
2403 {
2404         char mdfourbuf[16];
2405         long t1, t2;
2406
2407         t1 = (long) time(NULL);
2408         t2 = strtol(s, NULL, 0);
2409         if(abs(t1 - t2) > rcon_secure_maxdiff.integer)
2410                 return false;
2411
2412         if(!HMAC_MDFOUR_16BYTES((unsigned char *) mdfourbuf, (unsigned char *) s, slen, (unsigned char *) password, strlen(password)))
2413                 return false;
2414
2415         return !memcmp(mdfourbuf, hash, 16);
2416 }
2417
2418 qboolean hmac_mdfour_challenge_matching(lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen)
2419 {
2420         char mdfourbuf[16];
2421         int i;
2422
2423         if(slen < (int)(sizeof(challenge[0].string)) - 1)
2424                 return false;
2425
2426         // validate the challenge
2427         for (i = 0;i < MAX_CHALLENGES;i++)
2428                 if(challenge[i].time > 0)
2429                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strncmp(challenge[i].string, s, sizeof(challenge[0].string) - 1))
2430                                 break;
2431         // if the challenge is not recognized, drop the packet
2432         if (i == MAX_CHALLENGES)
2433                 return false;
2434
2435         if(!HMAC_MDFOUR_16BYTES((unsigned char *) mdfourbuf, (unsigned char *) s, slen, (unsigned char *) password, strlen(password)))
2436                 return false;
2437
2438         if(memcmp(mdfourbuf, hash, 16))
2439                 return false;
2440
2441         // unmark challenge to prevent replay attacks
2442         challenge[i].time = 0;
2443
2444         return true;
2445 }
2446
2447 qboolean plaintext_matching(lhnetaddress_t *peeraddress, const char *password, const char *hash, const char *s, int slen)
2448 {
2449         return !strcmp(password, hash);
2450 }
2451
2452 /// returns a string describing the user level, or NULL for auth failure
2453 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)
2454 {
2455         const char *text, *userpass_start, *userpass_end, *userpass_startpass;
2456         static char buf[MAX_INPUTLINE];
2457         qboolean hasquotes;
2458         qboolean restricted = false;
2459         qboolean have_usernames = false;
2460
2461         userpass_start = rcon_password.string;
2462         while((userpass_end = strchr(userpass_start, ' ')))
2463         {
2464                 have_usernames = true;
2465                 strlcpy(buf, userpass_start, ((size_t)(userpass_end-userpass_start) >= sizeof(buf)) ? (int)(sizeof(buf)) : (int)(userpass_end-userpass_start+1));
2466                 if(buf[0])
2467                         if(comparator(peeraddress, buf, password, cs, cslen))
2468                                 goto allow;
2469                 userpass_start = userpass_end + 1;
2470         }
2471         if(userpass_start[0])
2472         {
2473                 userpass_end = userpass_start + strlen(userpass_start);
2474                 if(comparator(peeraddress, userpass_start, password, cs, cslen))
2475                         goto allow;
2476         }
2477
2478         restricted = true;
2479         have_usernames = false;
2480         userpass_start = rcon_restricted_password.string;
2481         while((userpass_end = strchr(userpass_start, ' ')))
2482         {
2483                 have_usernames = true;
2484                 strlcpy(buf, userpass_start, ((size_t)(userpass_end-userpass_start) >= sizeof(buf)) ? (int)(sizeof(buf)) : (int)(userpass_end-userpass_start+1));
2485                 if(buf[0])
2486                         if(comparator(peeraddress, buf, password, cs, cslen))
2487                                 goto check;
2488                 userpass_start = userpass_end + 1;
2489         }
2490         if(userpass_start[0])
2491         {
2492                 userpass_end = userpass_start + strlen(userpass_start);
2493                 if(comparator(peeraddress, userpass_start, password, cs, cslen))
2494                         goto check;
2495         }
2496
2497         return NULL; // DENIED
2498
2499 check:
2500         for(text = s; text != endpos; ++text)
2501                 if((signed char) *text > 0 && ((signed char) *text < (signed char) ' ' || *text == ';'))
2502                         return NULL; // block possible exploits against the parser/alias expansion
2503
2504         while(s != endpos)
2505         {
2506                 size_t l = strlen(s);
2507                 if(l)
2508                 {
2509                         hasquotes = (strchr(s, '"') != NULL);
2510                         // sorry, we can't allow these substrings in wildcard expressions,
2511                         // as they can mess with the argument counts
2512                         text = rcon_restricted_commands.string;
2513                         while(COM_ParseToken_Console(&text))
2514                         {
2515                                 // com_token now contains a pattern to check for...
2516                                 if(strchr(com_token, '*') || strchr(com_token, '?')) // wildcard expression, * can only match a SINGLE argument
2517                                 {
2518                                         if(!hasquotes)
2519                                                 if(matchpattern_with_separator(s, com_token, true, " ", true)) // note how we excluded tab, newline etc. above
2520                                                         goto match;
2521                                 }
2522                                 else if(strchr(com_token, ' ')) // multi-arg expression? must match in whole
2523                                 {
2524                                         if(!strcmp(com_token, s))
2525                                                 goto match;
2526                                 }
2527                                 else // single-arg expression? must match the beginning of the command
2528                                 {
2529                                         if(!strcmp(com_token, s))
2530                                                 goto match;
2531                                         if(!memcmp(va("%s ", com_token), s, strlen(com_token) + 1))
2532                                                 goto match;
2533                                 }
2534                         }
2535                         // if we got here, nothing matched!
2536                         return NULL;
2537                 }
2538 match:
2539                 s += l + 1;
2540         }
2541
2542 allow:
2543         userpass_startpass = strchr(userpass_start, ':');
2544         if(have_usernames && userpass_startpass && userpass_startpass < userpass_end)
2545                 return va("%srcon (username %.*s)", restricted ? "restricted " : "", (int)(userpass_startpass-userpass_start), userpass_start);
2546
2547         return va("%srcon", restricted ? "restricted " : "");
2548 }
2549
2550 void RCon_Execute(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress, const char *addressstring2, const char *userlevel, const char *s, const char *endpos)
2551 {
2552         if(userlevel)
2553         {
2554                 // looks like a legitimate rcon command with the correct password
2555                 const char *s_ptr = s;
2556                 Con_Printf("server received %s command from %s: ", userlevel, host_client ? host_client->name : addressstring2);
2557                 while(s_ptr != endpos)
2558                 {
2559                         size_t l = strlen(s_ptr);
2560                         if(l)
2561                                 Con_Printf(" %s;", s_ptr);
2562                         s_ptr += l + 1;
2563                 }
2564                 Con_Printf("\n");
2565
2566                 if (!host_client || !host_client->netconnection || LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
2567                         Con_Rcon_Redirect_Init(mysocket, peeraddress);
2568                 while(s != endpos)
2569                 {
2570                         size_t l = strlen(s);
2571                         if(l)
2572                         {
2573                                 client_t *host_client_save = host_client;
2574                                 Cmd_ExecuteString(s, src_command);
2575                                 host_client = host_client_save;
2576                                 // in case it is a command that changes host_client (like restart)
2577                         }
2578                         s += l + 1;
2579                 }
2580                 Con_Rcon_Redirect_End();
2581         }
2582         else
2583         {
2584                 Con_Printf("server denied rcon access to %s\n", host_client ? host_client->name : addressstring2);
2585         }
2586 }
2587
2588 extern void SV_SendServerinfo (client_t *client);
2589 static int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
2590 {
2591         int i, ret, clientnum, best;
2592         double besttime;
2593         client_t *client;
2594         char *s, *string, response[1400], addressstring2[128];
2595         static char stringbuf[16384];
2596         qboolean islocal = (LHNETADDRESS_GetAddressType(peeraddress) == LHNETADDRESSTYPE_LOOP);
2597
2598         if (!sv.active)
2599                 return false;
2600
2601         // convert the address to a string incase we need it
2602         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
2603
2604         // see if we can identify the sender as a local player
2605         // (this is necessary for rcon to send a reliable reply if the client is
2606         //  actually on the server, not sending remotely)
2607         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
2608                 if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
2609                         break;
2610         if (i == svs.maxclients)
2611                 host_client = NULL;
2612
2613         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
2614         {
2615                 // received a command string - strip off the packaging and put it
2616                 // into our string buffer with NULL termination
2617                 data += 4;
2618                 length -= 4;
2619                 length = min(length, (int)sizeof(stringbuf) - 1);
2620                 memcpy(stringbuf, data, length);
2621                 stringbuf[length] = 0;
2622                 string = stringbuf;
2623
2624                 if (developer_extra.integer)
2625                 {
2626                         Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
2627                         Com_HexDumpToConsole(data, length);
2628                 }
2629
2630                 if (length >= 12 && !memcmp(string, "getchallenge", 12) && (islocal || sv_public.integer > -3))
2631                 {
2632                         for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
2633                         {
2634                                 if(challenge[i].time > 0)
2635                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
2636                                                 break;
2637                                 if (besttime > challenge[i].time)
2638                                         besttime = challenge[best = i].time;
2639                         }
2640                         // if we did not find an exact match, choose the oldest and
2641                         // update address and string
2642                         if (i == MAX_CHALLENGES)
2643                         {
2644                                 i = best;
2645                                 challenge[i].address = *peeraddress;
2646                                 NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
2647                         }
2648                         challenge[i].time = realtime;
2649                         // send the challenge
2650                         NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
2651                         return true;
2652                 }
2653                 if (length > 8 && !memcmp(string, "connect\\", 8))
2654                 {
2655                         string += 7;
2656                         length -= 7;
2657
2658                         if (!(s = SearchInfostring(string, "challenge")))
2659                                 return true;
2660                         // validate the challenge
2661                         for (i = 0;i < MAX_CHALLENGES;i++)
2662                                 if(challenge[i].time > 0)
2663                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
2664                                                 break;
2665                         // if the challenge is not recognized, drop the packet
2666                         if (i == MAX_CHALLENGES)
2667                                 return true;
2668
2669                         if(!(islocal || sv_public.integer > -2))
2670                         {
2671                                 if (developer_extra.integer)
2672                                         Con_Printf("Datagram_ParseConnectionless: sending \"reject %s\" to %s.\n", sv_public_rejectreason.string, addressstring2);
2673                                 NetConn_WriteString(mysocket, va("\377\377\377\377reject %s", sv_public_rejectreason.string), peeraddress);
2674                                 return true;
2675                         }
2676
2677                         // check engine protocol
2678                         if(!(s = SearchInfostring(string, "protocol")) || strcmp(s, "darkplaces 3"))
2679                         {
2680                                 if (developer_extra.integer)
2681                                         Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
2682                                 NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
2683                                 return true;
2684                         }
2685
2686                         // see if this is a duplicate connection request or a disconnected
2687                         // client who is rejoining to the same client slot
2688                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2689                         {
2690                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
2691                                 {
2692                                         // this is a known client...
2693                                         if (client->spawned)
2694                                         {
2695                                                 // client crashed and is coming back,
2696                                                 // keep their stuff intact
2697                                                 if (developer_extra.integer)
2698                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", addressstring2);
2699                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
2700                                                 SV_VM_Begin();
2701                                                 SV_SendServerinfo(client);
2702                                                 SV_VM_End();
2703                                         }
2704                                         else
2705                                         {
2706                                                 // client is still trying to connect,
2707                                                 // so we send a duplicate reply
2708                                                 if (developer_extra.integer)
2709                                                         Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
2710                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
2711                                         }
2712                                         return true;
2713                                 }
2714                         }
2715
2716                         if (NetConn_PreventConnectFlood(peeraddress))
2717                                 return true;
2718
2719                         // find an empty client slot for this new client
2720                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2721                         {
2722                                 netconn_t *conn;
2723                                 if (!client->active && (conn = NetConn_Open(mysocket, peeraddress)))
2724                                 {
2725                                         // allocated connection
2726                                         if (developer_extra.integer)
2727                                                 Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
2728                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
2729                                         // now set up the client
2730                                         SV_VM_Begin();
2731                                         SV_ConnectClient(clientnum, conn);
2732                                         SV_VM_End();
2733                                         NetConn_Heartbeat(1);
2734                                         return true;
2735                                 }
2736                         }
2737
2738                         // no empty slots found - server is full
2739                         if (developer_extra.integer)
2740                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
2741                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
2742
2743                         return true;
2744                 }
2745                 if (length >= 7 && !memcmp(string, "getinfo", 7) && (islocal || sv_public.integer > -1))
2746                 {
2747                         const char *challenge = NULL;
2748
2749                         // If there was a challenge in the getinfo message
2750                         if (length > 8 && string[7] == ' ')
2751                                 challenge = string + 8;
2752
2753                         if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), false))
2754                         {
2755                                 if (developer_extra.integer)
2756                                         Con_DPrintf("Sending reply to master %s - %s\n", addressstring2, response);
2757                                 NetConn_WriteString(mysocket, response, peeraddress);
2758                         }
2759                         return true;
2760                 }
2761                 if (length >= 9 && !memcmp(string, "getstatus", 9) && (islocal || sv_public.integer > -1))
2762                 {
2763                         const char *challenge = NULL;
2764
2765                         // If there was a challenge in the getinfo message
2766                         if (length > 10 && string[9] == ' ')
2767                                 challenge = string + 10;
2768
2769                         if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), true))
2770                         {
2771                                 if (developer_extra.integer)
2772                                         Con_DPrintf("Sending reply to client %s - %s\n", addressstring2, response);
2773                                 NetConn_WriteString(mysocket, response, peeraddress);
2774                         }
2775                         return true;
2776                 }
2777                 if (length >= 37 && !memcmp(string, "srcon HMAC-MD4 TIME ", 20))
2778                 {
2779                         char *password = string + 20;
2780                         char *timeval = string + 37;
2781                         char *s = strchr(timeval, ' ');
2782                         char *endpos = string + length + 1; // one behind the NUL, so adding strlen+1 will eventually reach it
2783                         const char *userlevel;
2784
2785                         if(rcon_secure.integer > 1)
2786                                 return true;
2787
2788                         if(!s)
2789                                 return true; // invalid packet
2790                         ++s;
2791
2792                         userlevel = RCon_Authenticate(peeraddress, password, s, endpos, hmac_mdfour_time_matching, timeval, endpos - timeval - 1); // not including the appended \0 into the HMAC
2793                         RCon_Execute(mysocket, peeraddress, addressstring2, userlevel, s, endpos);
2794                         return true;
2795                 }
2796                 if (length >= 42 && !memcmp(string, "srcon HMAC-MD4 CHALLENGE ", 25))
2797                 {
2798                         char *password = string + 25;
2799                         char *challenge = string + 42;
2800                         char *s = strchr(challenge, ' ');
2801                         char *endpos = string + length + 1; // one behind the NUL, so adding strlen+1 will eventually reach it
2802                         const char *userlevel;
2803                         if(!s)
2804                                 return true; // invalid packet
2805                         ++s;
2806
2807                         userlevel = RCon_Authenticate(peeraddress, password, s, endpos, hmac_mdfour_challenge_matching, challenge, endpos - challenge - 1); // not including the appended \0 into the HMAC
2808                         RCon_Execute(mysocket, peeraddress, addressstring2, userlevel, s, endpos);
2809                         return true;
2810                 }
2811                 if (length >= 5 && !memcmp(string, "rcon ", 5))
2812                 {
2813                         int i;
2814                         char *s = string + 5;
2815                         char *endpos = string + length + 1; // one behind the NUL, so adding strlen+1 will eventually reach it
2816                         char password[64];
2817
2818                         if(rcon_secure.integer > 0)
2819                                 return true;
2820
2821                         for (i = 0;!ISWHITESPACE(*s);s++)
2822                                 if (i < (int)sizeof(password) - 1)
2823                                         password[i++] = *s;
2824                         if(ISWHITESPACE(*s) && s != endpos) // skip leading ugly space
2825                                 ++s;
2826                         password[i] = 0;
2827                         if (!ISWHITESPACE(password[0]))
2828                         {
2829                                 const char *userlevel = RCon_Authenticate(peeraddress, password, s, endpos, plaintext_matching, NULL, 0);
2830                                 RCon_Execute(mysocket, peeraddress, addressstring2, userlevel, s, endpos);
2831                         }
2832                         return true;
2833                 }
2834                 if (!strncmp(string, "extResponse ", 12))
2835                 {
2836                         ++sv_net_extresponse_count;
2837                         if(sv_net_extresponse_count > NET_EXTRESPONSE_MAX)
2838                                 sv_net_extresponse_count = NET_EXTRESPONSE_MAX;
2839                         sv_net_extresponse_last = (sv_net_extresponse_last + 1) % NET_EXTRESPONSE_MAX;
2840                         dpsnprintf(sv_net_extresponse[sv_net_extresponse_last], sizeof(sv_net_extresponse[sv_net_extresponse_last]), "'%s' %s", addressstring2, string + 12);
2841                         return true;
2842                 }
2843                 if (!strncmp(string, "ping", 4))
2844                 {
2845                         if (developer_extra.integer)
2846                                 Con_DPrintf("Received ping from %s, sending ack\n", addressstring2);
2847                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
2848                         return true;
2849                 }
2850                 if (!strncmp(string, "ack", 3))
2851                         return true;
2852                 // we may not have liked the packet, but it was a command packet, so
2853                 // we're done processing this packet now
2854                 return true;
2855         }
2856         // netquake control packets, supported for compatibility only, and only
2857         // when running game protocols that are normally served via this connection
2858         // protocol
2859         // (this protects more modern protocols against being used for
2860         //  Quake packet flood Denial Of Service attacks)
2861         if (length >= 5 && (i = BuffBigLong(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))
2862         {
2863                 int c;
2864                 int protocolnumber;
2865                 const char *protocolname;
2866                 data += 4;
2867                 length -= 4;
2868                 SZ_Clear(&net_message);
2869                 SZ_Write(&net_message, data, length);
2870                 MSG_BeginReading();
2871                 c = MSG_ReadByte();
2872                 switch (c)
2873                 {
2874                 case CCREQ_CONNECT:
2875                         if (developer_extra.integer)
2876                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
2877                         if(!(islocal || sv_public.integer > -2))
2878                         {
2879                                 if (developer_extra.integer)
2880                                         Con_DPrintf("Datagram_ParseConnectionless: sending CCREP_REJECT \"%s\" to %s.\n", sv_public_rejectreason.string, addressstring2);
2881                                 SZ_Clear(&net_message);
2882                                 // save space for the header, filled in later
2883                                 MSG_WriteLong(&net_message, 0);
2884                                 MSG_WriteByte(&net_message, CCREP_REJECT);
2885                                 MSG_WriteString(&net_message, va("%s\n", sv_public_rejectreason.string));
2886                                 StoreBigLong(net_message.data, NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2887                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2888                                 SZ_Clear(&net_message);
2889                                 break;
2890                         }
2891
2892                         protocolname = MSG_ReadString();
2893                         protocolnumber = MSG_ReadByte();
2894                         if (strcmp(protocolname, "QUAKE") || protocolnumber != NET_PROTOCOL_VERSION)
2895                         {
2896                                 if (developer_extra.integer)
2897                                         Con_DPrintf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
2898                                 SZ_Clear(&net_message);
2899                                 // save space for the header, filled in later
2900                                 MSG_WriteLong(&net_message, 0);
2901                                 MSG_WriteByte(&net_message, CCREP_REJECT);
2902                                 MSG_WriteString(&net_message, "Incompatible version.\n");
2903                                 StoreBigLong(net_message.data, NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2904                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2905                                 SZ_Clear(&net_message);
2906                                 break;
2907                         }
2908
2909                         // see if this connect request comes from a known client
2910                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2911                         {
2912                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
2913                                 {
2914                                         // this is either a duplicate connection request
2915                                         // or coming back from a timeout
2916                                         // (if so, keep their stuff intact)
2917
2918                                         // send a reply
2919                                         if (developer_extra.integer)
2920                                                 Con_DPrintf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
2921                                         SZ_Clear(&net_message);
2922                                         // save space for the header, filled in later
2923                                         MSG_WriteLong(&net_message, 0);
2924                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
2925                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
2926                                         StoreBigLong(net_message.data, NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2927                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2928                                         SZ_Clear(&net_message);
2929
2930                                         // if client is already spawned, re-send the
2931                                         // serverinfo message as they'll need it to play
2932                                         if (client->spawned)
2933                                         {
2934                                                 SV_VM_Begin();
2935                                                 SV_SendServerinfo(client);
2936                                                 SV_VM_End();
2937                                         }
2938                                         return true;
2939                                 }
2940                         }
2941
2942                         // this is a new client, check for connection flood
2943                         if (NetConn_PreventConnectFlood(peeraddress))
2944                                 break;
2945
2946                         // find a slot for the new client
2947                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2948                         {
2949                                 netconn_t *conn;
2950                                 if (!client->active && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
2951                                 {
2952                                         // connect to the client
2953                                         // everything is allocated, just fill in the details
2954                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
2955                                         if (developer_extra.integer)
2956                                                 Con_DPrintf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
2957                                         // send back the info about the server connection
2958                                         SZ_Clear(&net_message);
2959                                         // save space for the header, filled in later
2960                                         MSG_WriteLong(&net_message, 0);
2961                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
2962                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
2963                                         StoreBigLong(net_message.data, 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                                         // now set up the client struct
2967                                         SV_VM_Begin();
2968                                         SV_ConnectClient(clientnum, conn);
2969                                         SV_VM_End();
2970                                         NetConn_Heartbeat(1);
2971                                         return true;
2972                                 }
2973                         }
2974
2975                         if (developer_extra.integer)
2976                                 Con_DPrintf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
2977                         // no room; try to let player know
2978                         SZ_Clear(&net_message);
2979                         // save space for the header, filled in later
2980                         MSG_WriteLong(&net_message, 0);
2981                         MSG_WriteByte(&net_message, CCREP_REJECT);
2982                         MSG_WriteString(&net_message, "Server is full.\n");
2983                         StoreBigLong(net_message.data, NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2984                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2985                         SZ_Clear(&net_message);
2986                         break;
2987                 case CCREQ_SERVER_INFO:
2988                         if (developer_extra.integer)
2989                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
2990                         if(!(islocal || sv_public.integer > -1))
2991                                 break;
2992                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
2993                         {
2994                                 int numclients;
2995                                 char myaddressstring[128];
2996                                 if (developer_extra.integer)
2997                                         Con_DPrintf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
2998                                 SZ_Clear(&net_message);
2999                                 // save space for the header, filled in later
3000                                 MSG_WriteLong(&net_message, 0);
3001                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
3002                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), myaddressstring, sizeof(myaddressstring), true);
3003                                 MSG_WriteString(&net_message, myaddressstring);
3004                                 MSG_WriteString(&net_message, hostname.string);
3005                                 MSG_WriteString(&net_message, sv.name);
3006                                 // How many clients are there?
3007                                 for (i = 0, numclients = 0;i < svs.maxclients;i++)
3008                                         if (svs.clients[i].active)
3009                                                 numclients++;
3010                                 MSG_WriteByte(&net_message, numclients);
3011                                 MSG_WriteByte(&net_message, svs.maxclients);
3012                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
3013                                 StoreBigLong(net_message.data, NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
3014                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
3015                                 SZ_Clear(&net_message);
3016                         }
3017                         break;
3018                 case CCREQ_PLAYER_INFO:
3019                         if (developer_extra.integer)
3020                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
3021                         if(!(islocal || sv_public.integer > -1))
3022                                 break;
3023                         if (sv.active)
3024                         {
3025                                 int playerNumber, activeNumber, clientNumber;
3026                                 client_t *client;
3027
3028                                 playerNumber = MSG_ReadByte();
3029                                 activeNumber = -1;
3030                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
3031                                         if (client->active && ++activeNumber == playerNumber)
3032                                                 break;
3033                                 if (clientNumber != svs.maxclients)
3034                                 {
3035                                         SZ_Clear(&net_message);
3036                                         // save space for the header, filled in later
3037                                         MSG_WriteLong(&net_message, 0);
3038                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
3039                                         MSG_WriteByte(&net_message, playerNumber);
3040                                         MSG_WriteString(&net_message, client->name);
3041                                         MSG_WriteLong(&net_message, client->colors);
3042                                         MSG_WriteLong(&net_message, client->frags);
3043                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
3044                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
3045                                         StoreBigLong(net_message.data, NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
3046                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
3047                                         SZ_Clear(&net_message);
3048                                 }
3049                         }
3050                         break;
3051                 case CCREQ_RULE_INFO:
3052                         if (developer_extra.integer)
3053                                 Con_DPrintf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
3054                         if(!(islocal || sv_public.integer > -1))
3055                                 break;
3056                         if (sv.active)
3057                         {
3058                                 char *prevCvarName;
3059                                 cvar_t *var;
3060
3061                                 // find the search start location
3062                                 prevCvarName = MSG_ReadString();
3063                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
3064
3065                                 // send the response
3066                                 SZ_Clear(&net_message);
3067                                 // save space for the header, filled in later
3068                                 MSG_WriteLong(&net_message, 0);
3069                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
3070                                 if (var)
3071                                 {
3072                                         MSG_WriteString(&net_message, var->name);
3073                                         MSG_WriteString(&net_message, var->string);
3074                                 }
3075                                 StoreBigLong(net_message.data, NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
3076                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
3077                                 SZ_Clear(&net_message);
3078                         }
3079                         break;
3080                 default:
3081                         break;
3082                 }
3083                 SZ_Clear(&net_message);
3084                 // we may not have liked the packet, but it was a valid control
3085                 // packet, so we're done processing this packet now
3086                 return true;
3087         }
3088         if (host_client)
3089         {
3090                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length, sv.protocol, host_client->spawned ? net_messagetimeout.value : net_connecttimeout.value)) == 2)
3091                 {
3092                         SV_VM_Begin();
3093                         SV_ReadClientMessage();
3094                         SV_VM_End();
3095                         return ret;
3096                 }
3097         }
3098         return 0;
3099 }
3100
3101 void NetConn_ServerFrame(void)
3102 {
3103         int i, length;
3104         lhnetaddress_t peeraddress;
3105         for (i = 0;i < sv_numsockets;i++)
3106                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
3107                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
3108         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
3109         {
3110                 // never timeout loopback connections
3111                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
3112                 {
3113                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
3114                         SV_VM_Begin();
3115                         SV_DropClient(false);
3116                         SV_VM_End();
3117                 }
3118         }
3119 }
3120
3121 void NetConn_SleepMicroseconds(int microseconds)
3122 {
3123         LHNET_SleepUntilPacket_Microseconds(microseconds);
3124 }
3125
3126 void NetConn_QueryMasters(qboolean querydp, qboolean queryqw)
3127 {
3128         int i, j;
3129         int masternum;
3130         lhnetaddress_t masteraddress;
3131         lhnetaddress_t broadcastaddress;
3132         char request[256];
3133
3134         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
3135                 return;
3136
3137         // 26000 is the default quake server port, servers on other ports will not
3138         // be found
3139         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
3140         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
3141
3142         if (querydp)
3143         {
3144                 for (i = 0;i < cl_numsockets;i++)
3145                 {
3146                         if (cl_sockets[i])
3147                         {
3148                                 const char *cmdname, *extraoptions;
3149                                 int af = LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i]));
3150
3151                                 if(LHNETADDRESS_GetAddressType(&broadcastaddress) == af)
3152                                 {
3153                                         // search LAN for Quake servers
3154                                         SZ_Clear(&net_message);
3155                                         // save space for the header, filled in later
3156                                         MSG_WriteLong(&net_message, 0);
3157                                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
3158                                         MSG_WriteString(&net_message, "QUAKE");
3159                                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
3160                                         StoreBigLong(net_message.data, NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
3161                                         NetConn_Write(cl_sockets[i], net_message.data, net_message.cursize, &broadcastaddress);
3162                                         SZ_Clear(&net_message);
3163
3164                                         // search LAN for DarkPlaces servers
3165                                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377getstatus", &broadcastaddress);
3166                                 }
3167
3168                                 // build the getservers message to send to the dpmaster master servers
3169                                 if (LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == LHNETADDRESSTYPE_INET6)
3170                                 {
3171                                         cmdname = "getserversExt";
3172                                         extraoptions = " ipv4 ipv6";  // ask for IPv4 and IPv6 servers
3173                                 }
3174                                 else
3175                                 {
3176                                         cmdname = "getservers";
3177                                         extraoptions = "";
3178                                 }
3179                                 dpsnprintf(request, sizeof(request), "\377\377\377\377%s %s %u empty full%s", cmdname, gamename, NET_PROTOCOL_VERSION, extraoptions);
3180
3181                                 // search internet
3182                                 for (masternum = 0;sv_masters[masternum].name;masternum++)
3183                                 {
3184                                         if (sv_masters[masternum].string && sv_masters[masternum].string[0] && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, DPMASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == af)
3185                                         {
3186                                                 masterquerycount++;
3187                                                 NetConn_WriteString(cl_sockets[i], request, &masteraddress);
3188                                         }
3189                                 }
3190
3191                                 // search favorite servers
3192                                 for(j = 0; j < nFavorites; ++j)
3193                                 {
3194                                         if(LHNETADDRESS_GetAddressType(&favorites[j]) == af)
3195                                         {
3196                                                 if(LHNETADDRESS_ToString(&favorites[j], request, sizeof(request), true))
3197                                                         NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_DARKPLACES7, request, true );
3198                                         }
3199                                 }
3200                         }
3201                 }
3202         }
3203
3204         // only query QuakeWorld servers when the user wants to
3205         if (queryqw)
3206         {
3207                 for (i = 0;i < cl_numsockets;i++)
3208                 {
3209                         if (cl_sockets[i])
3210                         {
3211                                 int af = LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i]));
3212
3213                                 if(LHNETADDRESS_GetAddressType(&broadcastaddress) == af)
3214                                 {
3215                                         // search LAN for QuakeWorld servers
3216                                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377status\n", &broadcastaddress);
3217
3218                                         // build the getservers message to send to the qwmaster master servers
3219                                         // note this has no -1 prefix, and the trailing nul byte is sent
3220                                         dpsnprintf(request, sizeof(request), "c\n");
3221                                 }
3222
3223                                 // search internet
3224                                 for (masternum = 0;sv_qwmasters[masternum].name;masternum++)
3225                                 {
3226                                         if (sv_qwmasters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_qwmasters[masternum].string, QWMASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
3227                                         {
3228                                                 if (m_state != m_slist)
3229                                                 {
3230                                                         char lookupstring[128];
3231                                                         LHNETADDRESS_ToString(&masteraddress, lookupstring, sizeof(lookupstring), true);
3232                                                         Con_Printf("Querying master %s (resolved from %s)\n", lookupstring, sv_qwmasters[masternum].string);
3233                                                 }
3234                                                 masterquerycount++;
3235                                                 NetConn_Write(cl_sockets[i], request, (int)strlen(request) + 1, &masteraddress);
3236                                         }
3237                                 }
3238
3239                                 // search favorite servers
3240                                 for(j = 0; j < nFavorites; ++j)
3241                                 {
3242                                         if(LHNETADDRESS_GetAddressType(&favorites[j]) == af)
3243                                         {
3244                                                 if(LHNETADDRESS_ToString(&favorites[j], request, sizeof(request), true))
3245                                                 {
3246                                                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377status\n", &favorites[j]);
3247                                                         NetConn_ClientParsePacket_ServerList_PrepareQuery( PROTOCOL_QUAKEWORLD, request, true );
3248                                                 }
3249                                         }
3250                                 }
3251                         }
3252                 }
3253         }
3254         if (!masterquerycount)
3255         {
3256                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
3257                 M_Update_Return_Reason("No network");
3258         }
3259 }
3260
3261 void NetConn_Heartbeat(int priority)
3262 {
3263         lhnetaddress_t masteraddress;
3264         int masternum;
3265         lhnetsocket_t *mysocket;
3266
3267         // if it's a state change (client connected), limit next heartbeat to no
3268         // more than 30 sec in the future
3269         if (priority == 1 && nextheartbeattime > realtime + 30.0)
3270                 nextheartbeattime = realtime + 30.0;
3271
3272         // limit heartbeatperiod to 30 to 270 second range,
3273         // lower limit is to avoid abusing master servers with excess traffic,
3274         // upper limit is to avoid timing out on the master server (which uses
3275         // 300 sec timeout)
3276         if (sv_heartbeatperiod.value < 30)
3277                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
3278         if (sv_heartbeatperiod.value > 270)
3279                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
3280
3281         // make advertising optional and don't advertise singleplayer games, and
3282         // only send a heartbeat as often as the admin wants
3283         if (sv.active && sv_public.integer > 0 && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
3284         {
3285                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
3286                 for (masternum = 0;sv_masters[masternum].name;masternum++)
3287                         if (sv_masters[masternum].string && sv_masters[masternum].string[0] && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, DPMASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
3288                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
3289         }
3290 }
3291
3292 static void Net_Heartbeat_f(void)
3293 {
3294         if (sv.active)
3295                 NetConn_Heartbeat(2);
3296         else
3297                 Con_Print("No server running, can not heartbeat to master server.\n");
3298 }
3299
3300 void PrintStats(netconn_t *conn)
3301 {
3302         if ((cls.state == ca_connected && cls.protocol == PROTOCOL_QUAKEWORLD) || (sv.active && sv.protocol == PROTOCOL_QUAKEWORLD))
3303                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->outgoing_unreliable_sequence, conn->qw.incoming_sequence);
3304         else
3305                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->nq.sendSequence, conn->nq.receiveSequence);
3306 }
3307
3308 void Net_Stats_f(void)
3309 {
3310         netconn_t *conn;
3311         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
3312         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
3313         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
3314         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
3315         Con_Printf("packetsSent                = %i\n", packetsSent);
3316         Con_Printf("packetsReSent              = %i\n", packetsReSent);
3317         Con_Printf("packetsReceived            = %i\n", packetsReceived);
3318         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
3319         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
3320         Con_Print("connections                =\n");
3321         for (conn = netconn_list;conn;conn = conn->next)
3322                 PrintStats(conn);
3323 }
3324
3325 void Net_Refresh_f(void)
3326 {
3327         if (m_state != m_slist) {
3328                 Con_Print("Sending new requests to master servers\n");
3329                 ServerList_QueryList(false, true, false, true);
3330                 Con_Print("Listening for replies...\n");
3331         } else
3332                 ServerList_QueryList(false, true, false, false);
3333 }
3334
3335 void Net_Slist_f(void)
3336 {
3337         ServerList_ResetMasks();
3338         serverlist_sortbyfield = SLIF_PING;
3339         serverlist_sortflags = 0;
3340     if (m_state != m_slist) {
3341                 Con_Print("Sending requests to master servers\n");
3342                 ServerList_QueryList(true, true, false, true);
3343                 Con_Print("Listening for replies...\n");
3344         } else
3345                 ServerList_QueryList(true, true, false, false);
3346 }
3347
3348 void Net_SlistQW_f(void)
3349 {
3350         ServerList_ResetMasks();
3351         serverlist_sortbyfield = SLIF_PING;
3352         serverlist_sortflags = 0;
3353     if (m_state != m_slist) {
3354                 Con_Print("Sending requests to master servers\n");
3355                 ServerList_QueryList(true, false, true, true);
3356                 serverlist_consoleoutput = true;
3357                 Con_Print("Listening for replies...\n");
3358         } else
3359                 ServerList_QueryList(true, false, true, false);
3360 }
3361
3362 void NetConn_Init(void)
3363 {
3364         int i;
3365         lhnetaddress_t tempaddress;
3366         netconn_mempool = Mem_AllocPool("network connections", 0, NULL);
3367         Cmd_AddCommand("net_stats", Net_Stats_f, "print network statistics");
3368         Cmd_AddCommand("net_slist", Net_Slist_f, "query dp master servers and print all server information");
3369         Cmd_AddCommand("net_slistqw", Net_SlistQW_f, "query qw master servers and print all server information");
3370         Cmd_AddCommand("net_refresh", Net_Refresh_f, "query dp master servers and refresh all server information");
3371         Cmd_AddCommand("heartbeat", Net_Heartbeat_f, "send a heartbeat to the master server (updates your server information)");
3372         Cvar_RegisterVariable(&rcon_restricted_password);
3373         Cvar_RegisterVariable(&rcon_restricted_commands);
3374         Cvar_RegisterVariable(&rcon_secure_maxdiff);
3375         Cvar_RegisterVariable(&net_slist_queriespersecond);
3376         Cvar_RegisterVariable(&net_slist_queriesperframe);
3377         Cvar_RegisterVariable(&net_slist_timeout);
3378         Cvar_RegisterVariable(&net_slist_maxtries);
3379         Cvar_RegisterVariable(&net_slist_favorites);
3380         Cvar_RegisterVariable(&net_slist_pause);
3381         Cvar_RegisterVariable(&net_messagetimeout);
3382         Cvar_RegisterVariable(&net_connecttimeout);
3383         Cvar_RegisterVariable(&net_connectfloodblockingtimeout);
3384         Cvar_RegisterVariable(&cl_netlocalping);
3385         Cvar_RegisterVariable(&cl_netpacketloss_send);
3386         Cvar_RegisterVariable(&cl_netpacketloss_receive);
3387         Cvar_RegisterVariable(&hostname);
3388         Cvar_RegisterVariable(&developer_networking);
3389         Cvar_RegisterVariable(&cl_netport);
3390         Cvar_RegisterVariable(&sv_netport);
3391         Cvar_RegisterVariable(&net_address);
3392         Cvar_RegisterVariable(&net_address_ipv6);
3393         Cvar_RegisterVariable(&sv_public);
3394         Cvar_RegisterVariable(&sv_public_rejectreason);
3395         Cvar_RegisterVariable(&sv_heartbeatperiod);
3396         for (i = 0;sv_masters[i].name;i++)
3397                 Cvar_RegisterVariable(&sv_masters[i]);
3398         Cvar_RegisterVariable(&gameversion);
3399         Cvar_RegisterVariable(&gameversion_min);
3400         Cvar_RegisterVariable(&gameversion_max);
3401 // 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.
3402         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
3403         {
3404                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
3405                 {
3406                         Con_Printf("-ip option used, setting net_address to \"%s\"\n", com_argv[i + 1]);
3407                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
3408                 }
3409                 else
3410                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
3411         }
3412 // 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
3413         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
3414         {
3415                 i = atoi(com_argv[i + 1]);
3416                 if (i >= 0 && i < 65536)
3417                 {
3418                         Con_Printf("-port option used, setting port cvar to %i\n", i);
3419                         Cvar_SetValueQuick(&sv_netport, i);
3420                 }
3421                 else
3422                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
3423         }
3424         cl_numsockets = 0;
3425         sv_numsockets = 0;
3426         net_message.data = net_message_buf;
3427         net_message.maxsize = sizeof(net_message_buf);
3428         net_message.cursize = 0;
3429         LHNET_Init();
3430 }
3431
3432 void NetConn_Shutdown(void)
3433 {
3434         NetConn_CloseClientPorts();
3435         NetConn_CloseServerPorts();
3436         LHNET_Shutdown();
3437 }
3438