netconn.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3 Copyright (C) 2002 Mathieu Olivier
   4 Copyright (C) 2003 Forest Hale
   5
   6 This program is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public License
   8 as published by the Free Software Foundation; either version 2
   9 of the License, or (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14
  15 See the GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20
  21 */
  22
  23 #include "quakedef.h"
  24 #include "lhnet.h"
  25
  26 #define MASTER_PORT 27950
  27
  28 cvar_t sv_public = {0, "sv_public", "0"};
  29 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "180"};
  30
  31 static cvar_t sv_masters [] =
  32 {
  33         {CVAR_SAVE, "sv_master1", ""},
  34         {CVAR_SAVE, "sv_master2", ""},
  35         {CVAR_SAVE, "sv_master3", ""},
  36         {CVAR_SAVE, "sv_master4", ""},
  37         {0, "sv_masterextra1", "198.88.152.4"},
  38         {0, "sv_masterextra2", "68.102.242.12"},
  39         {0, NULL, NULL}
  40 };
  41
  42 static double nextheartbeattime = 0;
  43
  44 sizebuf_t net_message;
  45
  46 cvar_t net_messagetimeout = {0, "net_messagetimeout","300"};
  47 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED"};
  48 cvar_t developer_networking = {0, "developer_networking", "0"};
  49
  50 /* statistic counters */
  51 static int packetsSent = 0;
  52 static int packetsReSent = 0;
  53 static int packetsReceived = 0;
  54 static int receivedDuplicateCount = 0;
  55 static int droppedDatagrams = 0;
  56
  57 static int unreliableMessagesSent = 0;
  58 static int unreliableMessagesReceived = 0;
  59 static int reliableMessagesSent = 0;
  60 static int reliableMessagesReceived = 0;
  61
  62 int hostCacheCount = 0;
  63 hostcache_t hostcache[HOSTCACHESIZE];
  64
  65 static qbyte sendbuffer[NET_MAXMESSAGE];
  66 static qbyte readbuffer[NET_MAXMESSAGE];
  67
  68 int cl_numsockets;
  69 lhnetsocket_t *cl_sockets[16];
  70 int sv_numsockets;
  71 lhnetsocket_t *sv_sockets[16];
  72
  73 netconn_t *netconn_list = NULL;
  74 mempool_t *netconn_mempool = NULL;
  75
  76 cvar_t cl_netport = {0, "cl_port", "0"};
  77 cvar_t cl_netaddress = {0, "cl_netaddress", "0.0.0.0"};
  78 cvar_t cl_netaddress_ipv6 = {0, "cl_netaddress_ipv6", "[0:0:0:0:0:0:0:0]:0"};
  79
  80 cvar_t sv_netport = {0, "port", "26000"};
  81 cvar_t sv_netaddress = {0, "sv_netaddress", "0.0.0.0"};
  82 cvar_t sv_netaddress_ipv6 = {0, "sv_netaddress_ipv6", "[0:0:0:0:0:0:0:0]:26000"};
  83
  84 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
  85 {
  86         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
  87         if (developer_networking.integer && length != 0)
  88         {
  89                 char addressstring[128], addressstring2[128];
  90                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
  91                 if (length > 0)
  92                 {
  93                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
  94                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
  95                         Com_HexDumpToConsole(data, length);
  96                 }
  97                 else
  98                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
  99         }
 100         return length;
 101 }
 102
 103 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 104 {
 105         int ret = LHNET_Write(mysocket, data, length, peeraddress);
 106         if (developer_networking.integer && ret != 0)
 107         {
 108                 char addressstring[128], addressstring2[128];
 109                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 110                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 111                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 112                 Com_HexDumpToConsole(data, length);
 113         }
 114         return ret;
 115 }
 116
 117 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
 118 {
 119         unsigned int packetLen;
 120         unsigned int dataLen;
 121         unsigned int eom;
 122         unsigned int *header;
 123
 124 //#ifdef DEBUG
 125         if (data->cursize == 0)
 126                 Sys_Error("Datagram_SendMessage: zero length message\n");
 127
 128         if (data->cursize > NET_MAXMESSAGE)
 129                 Sys_Error("Datagram_SendMessage: message too big %u\n", data->cursize);
 130
 131         if (conn->canSend == false)
 132                 Sys_Error("SendMessage: called with canSend == false\n");
 133 //#endif
 134
 135         memcpy(conn->sendMessage, data->data, data->cursize);
 136         conn->sendMessageLength = data->cursize;
 137
 138         if (conn->sendMessageLength <= MAX_DATAGRAM)
 139         {
 140                 dataLen = conn->sendMessageLength;
 141                 eom = NETFLAG_EOM;
 142         }
 143         else
 144         {
 145                 dataLen = MAX_DATAGRAM;
 146                 eom = 0;
 147         }
 148
 149         packetLen = NET_HEADERSIZE + dataLen;
 150
 151         header = (void *)sendbuffer;
 152         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 153         header[1] = BigLong(conn->sendSequence);
 154         memcpy(sendbuffer + 8, conn->sendMessage, dataLen);
 155
 156         conn->sendSequence++;
 157         conn->canSend = false;
 158
 159         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 160                 return -1;
 161
 162         conn->lastSendTime = realtime;
 163         packetsSent++;
 164         reliableMessagesSent++;
 165         return 1;
 166 }
 167
 168 static void NetConn_SendMessageNext(netconn_t *conn)
 169 {
 170         unsigned int packetLen;
 171         unsigned int dataLen;
 172         unsigned int eom;
 173         unsigned int *header;
 174
 175         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
 176         {
 177                 if (conn->sendMessageLength <= MAX_DATAGRAM)
 178                 {
 179                         dataLen = conn->sendMessageLength;
 180                         eom = NETFLAG_EOM;
 181                 }
 182                 else
 183                 {
 184                         dataLen = MAX_DATAGRAM;
 185                         eom = 0;
 186                 }
 187
 188                 packetLen = NET_HEADERSIZE + dataLen;
 189
 190                 header = (void *)sendbuffer;
 191                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 192                 header[1] = BigLong(conn->sendSequence);
 193                 memcpy(sendbuffer + 8, conn->sendMessage, dataLen);
 194
 195                 conn->sendSequence++;
 196                 conn->sendNext = false;
 197
 198                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 199                         return;
 200
 201                 conn->lastSendTime = realtime;
 202                 packetsSent++;
 203         }
 204 }
 205
 206 static void NetConn_ReSendMessage(netconn_t *conn)
 207 {
 208         unsigned int packetLen;
 209         unsigned int dataLen;
 210         unsigned int eom;
 211         unsigned int *header;
 212
 213         if (conn->sendMessageLength && !conn->canSend && (realtime - conn->lastSendTime) > 1.0)
 214         {
 215                 if (conn->sendMessageLength <= MAX_DATAGRAM)
 216                 {
 217                         dataLen = conn->sendMessageLength;
 218                         eom = NETFLAG_EOM;
 219                 }
 220                 else
 221                 {
 222                         dataLen = MAX_DATAGRAM;
 223                         eom = 0;
 224                 }
 225
 226                 packetLen = NET_HEADERSIZE + dataLen;
 227
 228                 header = (void *)sendbuffer;
 229                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 230                 header[1] = BigLong(conn->sendSequence - 1);
 231                 memcpy(sendbuffer + 8, conn->sendMessage, dataLen);
 232
 233                 conn->sendNext = false;
 234
 235                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 236                         return;
 237
 238                 conn->lastSendTime = realtime;
 239                 packetsReSent++;
 240         }
 241 }
 242
 243 qboolean NetConn_CanSendMessage(netconn_t *conn)
 244 {
 245         return conn->canSend;
 246 }
 247
 248 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
 249 {
 250         int packetLen;
 251         int *header;
 252
 253 #ifdef DEBUG
 254         if (data->cursize == 0)
 255                 Sys_Error("Datagram_SendUnreliableMessage: zero length message\n");
 256
 257         if (data->cursize > MAX_DATAGRAM)
 258                 Sys_Error("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
 259 #endif
 260
 261         packetLen = NET_HEADERSIZE + data->cursize;
 262
 263         header = (void *)sendbuffer;
 264         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
 265         header[1] = BigLong(conn->unreliableSendSequence);
 266         memcpy(sendbuffer + 8, data->data, data->cursize);
 267
 268         conn->unreliableSendSequence++;
 269
 270         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 271                 return -1;
 272
 273         packetsSent++;
 274         unreliableMessagesSent++;
 275         return 1;
 276 }
 277
 278 void NetConn_CloseClientPorts(void)
 279 {
 280         for (;cl_numsockets > 0;cl_numsockets--)
 281                 if (cl_sockets[cl_numsockets - 1])
 282                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 283 }
 284
 285 void NetConn_OpenClientPorts(void)
 286 {
 287         int port;
 288         lhnetaddress_t address;
 289         NetConn_CloseClientPorts();
 290         port = bound(0, cl_netport.integer, 65535);
 291         if (cl_netport.integer != port)
 292                 Cvar_SetValueQuick(&cl_netport, port);
 293         LHNETADDRESS_FromString(&address, "local", port);
 294         cl_sockets[cl_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 295         LHNETADDRESS_FromString(&address, cl_netaddress.string, port);
 296         cl_sockets[cl_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 297         LHNETADDRESS_FromString(&address, cl_netaddress_ipv6.string, port);
 298         cl_sockets[cl_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 299 }
 300
 301 void NetConn_CloseServerPorts(void)
 302 {
 303         for (;sv_numsockets > 0;sv_numsockets--)
 304                 if (sv_sockets[sv_numsockets - 1])
 305                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 306 }
 307
 308 void NetConn_OpenServerPorts(int opennetports)
 309 {
 310         int port;
 311         lhnetaddress_t address;
 312         NetConn_CloseServerPorts();
 313         port = bound(0, sv_netport.integer, 65535);
 314         if (port == 0)
 315                 port = 26000;
 316         if (sv_netport.integer != port)
 317                 Cvar_SetValueQuick(&sv_netport, port);
 318         LHNETADDRESS_FromString(&address, "local", port);
 319         sv_sockets[sv_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 320         if (opennetports)
 321         {
 322                 LHNETADDRESS_FromString(&address, sv_netaddress.string, port);
 323                 sv_sockets[sv_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 324                 LHNETADDRESS_FromString(&address, sv_netaddress_ipv6.string, port);
 325                 sv_sockets[sv_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 326         }
 327 }
 328
 329 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 330 {
 331         int i, a = LHNETADDRESS_GetAddressType(address);
 332         for (i = 0;i < cl_numsockets;i++)
 333                 if (LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 334                         return cl_sockets[i];
 335         return NULL;
 336 }
 337
 338 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 339 {
 340         int i, a = LHNETADDRESS_GetAddressType(address);
 341         for (i = 0;i < sv_numsockets;i++)
 342                 if (LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 343                         return sv_sockets[i];
 344         return NULL;
 345 }
 346
 347 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 348 {
 349         netconn_t *conn;
 350         conn = Mem_Alloc(netconn_mempool, sizeof(*conn));
 351         conn->mysocket = mysocket;
 352         conn->peeraddress = *peeraddress;
 353         conn->canSend = true;
 354         conn->connecttime = realtime;
 355         conn->lastMessageTime = realtime;
 356         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
 357         conn->next = netconn_list;
 358         netconn_list = conn;
 359         return conn;
 360 }
 361
 362 void NetConn_Close(netconn_t *conn)
 363 {
 364         netconn_t *c;
 365         // remove connection from list
 366         if (conn == netconn_list)
 367                 netconn_list = conn->next;
 368         else
 369         {
 370                 for (c = netconn_list;c;c = c->next)
 371                 {
 372                         if (c->next == conn)
 373                         {
 374                                 c->next = conn->next;
 375                                 break;
 376                         }
 377                 }
 378                 // not found in list, we'll avoid crashing here...
 379                 if (!c)
 380                         return;
 381         }
 382         // free connection
 383         Mem_Free(conn);
 384 }
 385
 386 static int clientport = -1;
 387 static int clientport2 = -1;
 388 static int hostport = -1;
 389 static void NetConn_UpdateServerStuff(void)
 390 {
 391         if (clientport2 != cl_netport.integer)
 392         {
 393                 clientport2 = cl_netport.integer;
 394                 if (cls.state == ca_connected)
 395                         Con_Printf("Changing \"cl_port\" will not take effect until you reconnect.\n");
 396         }
 397         if (cls.state != ca_dedicated)
 398         {
 399                 if (cls.state == ca_disconnected && clientport != cl_netport.integer)
 400                 {
 401                         clientport = cl_netport.integer;
 402                         NetConn_CloseClientPorts();
 403                 }
 404                 if (cl_numsockets == 0)
 405                         NetConn_OpenClientPorts();
 406         }
 407
 408         if (hostport != sv_netport.integer)
 409         {
 410                 hostport = sv_netport.integer;
 411                 if (sv.active)
 412                         Con_Printf("Changing \"port\" will not take effect until \"map\" command is executed.\n");
 413         }
 414 }
 415
 416 int NetConn_ReceivedMessage(netconn_t *conn, qbyte *data, int length)
 417 {
 418         unsigned int count;
 419         unsigned int flags;
 420         unsigned int sequence;
 421
 422         if (length < 8)
 423                 return 0;
 424
 425         length = BigLong(((int *)data)[0]);
 426         flags = length & ~NETFLAG_LENGTH_MASK;
 427         length &= NETFLAG_LENGTH_MASK;
 428         // control packets were already handled
 429         if (!(flags & NETFLAG_CTL))
 430         {
 431                 sequence = BigLong(((int *)data)[1]);
 432                 packetsReceived++;
 433                 data += 8;
 434                 length -= 8;
 435                 if (flags & NETFLAG_UNRELIABLE)
 436                 {
 437                         if (sequence >= conn->unreliableReceiveSequence)
 438                         {
 439                                 if (sequence > conn->unreliableReceiveSequence)
 440                                 {
 441                                         count = sequence - conn->unreliableReceiveSequence;
 442                                         droppedDatagrams += count;
 443                                         Con_DPrintf("Dropped %u datagram(s)\n", count);
 444                                 }
 445                                 conn->unreliableReceiveSequence = sequence + 1;
 446                                 unreliableMessagesReceived++;
 447                                 SZ_Clear(&net_message);
 448                                 SZ_Write(&net_message, data, length);
 449                                 MSG_BeginReading();
 450                                 return 2;
 451                         }
 452                         else
 453                                 Con_DPrintf("Got a stale datagram\n");
 454                         return 1;
 455                 }
 456                 else if (flags & NETFLAG_ACK)
 457                 {
 458                         if (sequence == (conn->sendSequence - 1))
 459                         {
 460                                 if (sequence == conn->ackSequence)
 461                                 {
 462                                         conn->ackSequence++;
 463                                         if (conn->ackSequence != conn->sendSequence)
 464                                                 Con_DPrintf("ack sequencing error\n");
 465                                         conn->sendMessageLength -= MAX_DATAGRAM;
 466                                         if (conn->sendMessageLength > 0)
 467                                         {
 468                                                 memcpy(conn->sendMessage, conn->sendMessage+MAX_DATAGRAM, conn->sendMessageLength);
 469                                                 conn->sendNext = true;
 470                                                 NetConn_SendMessageNext(conn);
 471                                         }
 472                                         else
 473                                         {
 474                                                 conn->sendMessageLength = 0;
 475                                                 conn->canSend = true;
 476                                         }
 477                                 }
 478                                 else
 479                                         Con_DPrintf("Duplicate ACK received\n");
 480                         }
 481                         else
 482                                 Con_DPrintf("Stale ACK received\n");
 483                         return 1;
 484                 }
 485                 else if (flags & NETFLAG_DATA)
 486                 {
 487                         unsigned int temppacket[2];
 488                         temppacket[0] = BigLong(8 | NETFLAG_ACK);
 489                         temppacket[1] = BigLong(sequence);
 490                         NetConn_Write(conn->mysocket, (qbyte *)temppacket, 8, &conn->peeraddress);
 491                         if (sequence == conn->receiveSequence)
 492                         {
 493                                 conn->receiveSequence++;
 494                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
 495                                 conn->receiveMessageLength += length;
 496                                 if (flags & NETFLAG_EOM)
 497                                 {
 498                                         reliableMessagesReceived++;
 499                                         SZ_Clear(&net_message);
 500                                         SZ_Write(&net_message, conn->receiveMessage, conn->receiveMessageLength);
 501                                         conn->receiveMessageLength = 0;
 502                                         MSG_BeginReading();
 503                                         return 2;
 504                                 }
 505                         }
 506                         else
 507                                 receivedDuplicateCount++;
 508                         return 1;
 509                 }
 510         }
 511         return 0;
 512 }
 513
 514 static struct
 515 {
 516         double senttime;
 517         lhnetaddress_t peeraddress;
 518 }
 519 pingcache[HOSTCACHESIZE];
 520
 521 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 522 {
 523         int ret, c, control;
 524         lhnetaddress_t svaddress;
 525         const char *s;
 526         char *string, addressstring2[128], cname[128], ipstring[32];
 527
 528         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 529         {
 530                 data += 4;
 531                 length -= 4;
 532                 string = (char *)data;
 533                 if (developer.integer)
 534                 {
 535                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 536                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
 537                         Com_HexDumpToConsole(data, length);
 538                 }
 539                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
 540                 {
 541                         int i, j, c, n, users, maxusers;
 542                         char game[32], mod[32], map[32], name[128];
 543                         double pingtime;
 544                         hostcache_t temp;
 545                         string += 13;
 546                         // hostcache only uses text addresses
 547                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
 548                         // search the cache for this server
 549                         for (n = 0; n < hostCacheCount; n++)
 550                                 if (!strcmp(cname, hostcache[n].cname))
 551                                         break;
 552                         // add it or update it
 553                         if (n == hostCacheCount)
 554                         {
 555                                 // if cache is full replace highest ping server (the list is
 556                                 // kept sorted so this is always the last, and if this server
 557                                 // is good it will be sorted into an early part of the list)
 558                                 if (hostCacheCount >= HOSTCACHESIZE)
 559                                         n = hostCacheCount - 1;
 560                                 else
 561                                         hostCacheCount++;
 562                         }
 563                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strncpy(game, s, sizeof(game) - 1);else game[0] = 0;
 564                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strncpy(mod , s, sizeof(mod ) - 1);else mod[0] = 0;
 565                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strncpy(map , s, sizeof(map ) - 1);else map[0] = 0;
 566                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strncpy(name, s, sizeof(name) - 1);else name[0] = 0;
 567                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) c = atoi(s);else c = -1;
 568                         if ((s = SearchInfostring(string, "clients"      )) != NULL) users = atoi(s);else users = 0;
 569                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) maxusers = atoi(s);else maxusers = 0;
 570                         pingtime = 9999;
 571                         for (i = 0;i < HOSTCACHESIZE;i++)
 572                                 if (!LHNETADDRESS_Compare(peeraddress, &pingcache[i].peeraddress))
 573                                         pingtime = (int)(realtime - pingcache[i].senttime);
 574                         pingtime = bound(0, pingtime, 9999);
 575                         memset(&hostcache[n], 0, sizeof(hostcache[n]));
 576                         // store the data the engine cares about (address and ping)
 577                         strcpy(hostcache[n].cname, cname);
 578                         hostcache[n].ping = pingtime;
 579                         // build description strings for the things users care about
 580                         snprintf(hostcache[n].line1, sizeof(hostcache[n].line1), "%5d%c%3u/%3u %-65.65s", (int)pingtime, c != NET_PROTOCOL_VERSION ? '*' : ' ', users, maxusers, name);
 581                         snprintf(hostcache[n].line2, sizeof(hostcache[n].line2), "%-21.21s %-19.19s %-17.17s %-20.20s", cname, game, mod, map);
 582                         // if ping is especially high, display it as such
 583                         if (pingtime >= 300)
 584                         {
 585                                 // orange numbers (lower block)
 586                                 for (i = 0;i < 5;i++)
 587                                         if (hostcache[n].line1[i] != ' ')
 588                                                 hostcache[n].line1[i] += 128;
 589                         }
 590                         else if (pingtime >= 200)
 591                         {
 592                                 // yellow numbers (in upper block)
 593                                 for (i = 0;i < 5;i++)
 594                                         if (hostcache[n].line1[i] != ' ')
 595                                                 hostcache[n].line1[i] -= 30;
 596                         }
 597                         // if not in the slist menu we should print the server to console
 598                         if (m_state != m_slist)
 599                                 Con_Printf("%s\n%s\n", hostcache[n].line1, hostcache[n].line2);
 600                         // and finally, re-sort the list
 601                         for (i = 0;i < hostCacheCount;i++)
 602                         {
 603                                 for (j = i + 1;j < hostCacheCount;j++)
 604                                 {
 605                                         //if (strcmp(hostcache[j].name, hostcache[i].name) < 0)
 606                                         if (hostcache[i].ping > hostcache[j].ping)
 607                                         {
 608                                                 memcpy(&temp, &hostcache[j], sizeof(hostcache_t));
 609                                                 memcpy(&hostcache[j], &hostcache[i], sizeof(hostcache_t));
 610                                                 memcpy(&hostcache[i], &temp, sizeof(hostcache_t));
 611                                         }
 612                                 }
 613                         }
 614                         return true;
 615                 }
 616                 if (!strncmp(string, "getserversResponse\\", 19) && hostCacheCount < HOSTCACHESIZE)
 617                 {
 618                         int i, best;
 619                         double besttime;
 620                         // Extract the IP addresses
 621                         data += 18;
 622                         length -= 18;
 623                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
 624                         {
 625                                 sprintf(ipstring, "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
 626                                 if (developer.integer)
 627                                         Con_Printf("Requesting info from server %s\n", ipstring);
 628                                 LHNETADDRESS_FromString(&svaddress, ipstring, 0);
 629                                 NetConn_Write(mysocket, "\377\377\377\377getinfo", 11, &svaddress);
 630                                 // replace oldest or matching entry in ping cache
 631                                 // we scan this later when getting a reply to see how long it took
 632                                 besttime = realtime;
 633                                 best = 0;
 634                                 for (i = 0;i < HOSTCACHESIZE;i++)
 635                                 {
 636                                         if (!LHNETADDRESS_Compare(&svaddress, &pingcache[i].peeraddress))
 637                                         {
 638                                                 best = i;
 639                                                 break;
 640                                         }
 641                                         if (besttime > pingcache[i].senttime)
 642                                         {
 643                                                 besttime = pingcache[i].senttime;
 644                                                 best = i;
 645                                                 // if ping cache isn't full yet we can skip out early
 646                                                 if (!besttime)
 647                                                         break;
 648                                         }
 649                                 }
 650                                 pingcache[best].peeraddress = svaddress;
 651                                 pingcache[best].senttime = realtime;
 652                                 // move on to next address in packet
 653                                 data += 7;
 654                                 length -= 7;
 655                         }
 656                         return true;
 657                 }
 658                 /*
 659                 if (!strncmp(string, "ping", 4))
 660                 {
 661                         if (developer.integer)
 662                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
 663                         NetConn_Write(mysocket, "\377\377\377\377ack", 7, peeraddress);
 664                         return true;
 665                 }
 666                 if (!strncmp(string, "ack", 3))
 667                         return true;
 668                 */
 669                 // we may not have liked the packet, but it was a command packet, so
 670                 // we're done processing this packet now
 671                 return true;
 672         }
 673         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
 674         {
 675                 c = data[4];
 676                 data += 5;
 677                 length -= 5;
 678                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 679                 switch (c)
 680                 {
 681                 case CCREP_ACCEPT:
 682                         if (developer.integer)
 683                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
 684                         if (cls.connect_trying)
 685                         {
 686                                 Con_Printf("Connection accepted to %s\n", addressstring2);
 687                                 key_dest = key_game;
 688                                 m_state = m_none;
 689                                 cls.netcon = NetConn_Open(mysocket, peeraddress);
 690                                 cls.connect_trying = false;
 691                                 cls.demonum = -1;                       // not in the demo loop now
 692                                 cls.state = ca_connected;
 693                                 cls.signon = 0;                         // need all the signon messages before playing
 694                                 CL_ClearState();
 695                                 Host_Reconnect_f();
 696                         }
 697                         break;
 698                 case CCREP_REJECT:
 699                         if (developer.integer)
 700                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
 701                         Con_Printf("%s\n", data);
 702                         strncpy(m_return_reason, data, sizeof(m_return_reason) - 1);
 703                         break;
 704 #if 0
 705                 case CCREP_SERVER_INFO:
 706                         if (developer.integer)
 707                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
 708                         if (cls.state != ca_dedicated)
 709                         {
 710                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
 711                                 // string we just ignore it and keep the real address
 712                                 MSG_ReadString();
 713                                 // hostcache only uses text addresses
 714                                 cname = UDP_AddrToString(readaddr);
 715                                 // search the cache for this server
 716                                 for (n = 0; n < hostCacheCount; n++)
 717                                         if (!strcmp(cname, hostcache[n].cname))
 718                                                 break;
 719                                 // add it
 720                                 if (n == hostCacheCount && hostCacheCount < HOSTCACHESIZE)
 721                                 {
 722                                         hostCacheCount++;
 723                                         memset(&hostcache[n], 0, sizeof(hostcache[n]));
 724                                         strcpy(hostcache[n].name, MSG_ReadString());
 725                                         strcpy(hostcache[n].map, MSG_ReadString());
 726                                         hostcache[n].users = MSG_ReadByte();
 727                                         hostcache[n].maxusers = MSG_ReadByte();
 728                                         c = MSG_ReadByte();
 729                                         if (c != NET_PROTOCOL_VERSION)
 730                                         {
 731                                                 strncpy(hostcache[n].cname, hostcache[n].name, sizeof(hostcache[n].cname) - 1);
 732                                                 hostcache[n].cname[sizeof(hostcache[n].cname) - 1] = 0;
 733                                                 strcpy(hostcache[n].name, "*");
 734                                                 strncat(hostcache[n].name, hostcache[n].cname, sizeof(hostcache[n].name) - 1);
 735                                                 hostcache[n].name[sizeof(hostcache[n].name) - 1] = 0;
 736                                         }
 737                                         strcpy(hostcache[n].cname, cname);
 738                                 }
 739                         }
 740                         break;
 741                 case CCREP_PLAYER_INFO:
 742                         // we got a CCREP_PLAYER_INFO??
 743                         //if (developer.integer)
 744                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
 745                         break;
 746                 case CCREP_RULE_INFO:
 747                         // we got a CCREP_RULE_INFO??
 748                         //if (developer.integer)
 749                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
 750                         break;
 751 #endif
 752                 default:
 753                         break;
 754                 }
 755                 // we may not have liked the packet, but it was a valid control
 756                 // packet, so we're done processing this packet now
 757                 return true;
 758         }
 759         ret = 0;
 760         if (length >= (int)NET_HEADERSIZE && cls.netcon && mysocket == cls.netcon->mysocket && !LHNETADDRESS_Compare(&cls.netcon->peeraddress, peeraddress) && (ret = NetConn_ReceivedMessage(cls.netcon, data, length)) == 2)
 761                 CL_ParseServerMessage();
 762         return ret;
 763 }
 764
 765 void NetConn_ClientFrame(void)
 766 {
 767         int i, length;
 768         lhnetaddress_t peeraddress;
 769         netconn_t *conn;
 770         NetConn_UpdateServerStuff();
 771         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
 772         {
 773                 if (cls.connect_remainingtries == 0)
 774                 {
 775                         cls.connect_trying = false;
 776                         Host_Error("Connect failed\n");
 777                         return;
 778                 }
 779                 if (cls.connect_nextsendtime)
 780                         Con_Printf("Still trying...\n");
 781                 else
 782                         Con_Printf("Trying...\n");
 783                 cls.connect_nextsendtime = realtime + 1;
 784                 cls.connect_remainingtries--;
 785                 SZ_Clear(&net_message);
 786                 // save space for the header, filled in later
 787                 MSG_WriteLong(&net_message, 0);
 788                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
 789                 MSG_WriteString(&net_message, "QUAKE");
 790                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
 791                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 792                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
 793                 SZ_Clear(&net_message);
 794         }
 795         for (i = 0;i < cl_numsockets;i++)
 796                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
 797                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
 798         if (cls.netcon && realtime > cls.netcon->lastMessageTime + net_messagetimeout.value)
 799         {
 800                 Con_Printf("Connection timed out\n");
 801                 CL_Disconnect();
 802         }
 803         for (conn = netconn_list;conn;conn = conn->next)
 804                 NetConn_ReSendMessage(conn);
 805 }
 806
 807 extern void SV_ConnectClient(int clientnum, netconn_t *netconnection);
 808 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 809 {
 810         int i, c, n, ret, clientnum, control, responselength;
 811         client_t *client;
 812         netconn_t *conn;
 813         char *string, response[512], addressstring2[128];
 814
 815         if (sv.active)
 816         {
 817                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 818                 {
 819                         data += 4;
 820                         length -= 4;
 821                         string = (char *)data;
 822
 823                         if (developer.integer)
 824                         {
 825                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 826                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
 827                                 Com_HexDumpToConsole(data, length);
 828                         }
 829
 830                         if (length >= 7 && !memcmp(string, "getinfo", 7))
 831                         {
 832                                 const char *challenge = NULL;
 833                                 // If there was a challenge in the getinfo message
 834                                 if (length > 8 && string[7] == ' ')
 835                                         challenge = string + 8;
 836                                 for (i = 0, n = 0;i < svs.maxclients;i++)
 837                                         if (svs.clients[i].active)
 838                                                 n++;
 839                                 responselength = snprintf(response, sizeof(response), "\377\377\377\377infoResponse\x0A"
 840                                                         "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
 841                                                         "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d%s%s",
 842                                                         gamename, com_modname, svs.maxclients, n,
 843                                                         sv.name, hostname.string, NET_PROTOCOL_VERSION, challenge ? "\\challenge\\" : "", challenge ? challenge : "");
 844                                 // does it fit in the buffer?
 845                                 if (responselength < (int)sizeof(response))
 846                                 {
 847                                         if (developer.integer)
 848                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
 849                                         NetConn_Write(mysocket, response, responselength, peeraddress);
 850                                 }
 851                                 return true;
 852                         }
 853                         /*
 854                         if (!strncmp(string, "ping", 4))
 855                         {
 856                                 if (developer.integer)
 857                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
 858                                 NetConn_Write(mysocket, "\377\377\377\377ack", 7, peeraddress);
 859                                 return true;
 860                         }
 861                         if (!strncmp(string, "ack", 3))
 862                                 return true;
 863                         */
 864                         // we may not have liked the packet, but it was a command packet, so
 865                         // we're done processing this packet now
 866                         return true;
 867                 }
 868                 if (length >= 5)
 869                 {
 870                         control = BigLong(*((int *)data));
 871                         if ((control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
 872                         {
 873                                 c = data[4];
 874                                 data += 5;
 875                                 length -= 5;
 876                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 877 #if 1
 878                                 switch (c)
 879                                 {
 880                                 case CCREQ_CONNECT:
 881                                         //if (developer.integer)
 882                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
 883                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
 884                                         {
 885                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
 886                                                 {
 887                                                         //if (developer.integer)
 888                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
 889 #if 0
 890                                                         NetConn_Write(mysocket, "\377\377\377\377reject Incompatible version.", 32, peeraddress);
 891 #else
 892                                                         SZ_Clear(&net_message);
 893                                                         // save space for the header, filled in later
 894                                                         MSG_WriteLong(&net_message, 0);
 895                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
 896                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
 897                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 898                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
 899                                                         SZ_Clear(&net_message);
 900 #endif
 901                                                 }
 902                                                 else
 903                                                 {
 904                                                         // see if this client is already connected
 905                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
 906                                                                 if (client->active && (ret = LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress)) == 0)//>= 0)
 907                                                                         break;
 908                                                         if (clientnum < svs.maxclients)
 909                                                         {
 910                                                                 // is this a duplicate connection request?
 911                                                                 if (ret == 0 && realtime - client->netconnection->connecttime < 2.0)
 912                                                                 {
 913                                                                         //if (developer.integer)
 914                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
 915                                                                         // yes, so send a duplicate reply
 916 #if 0
 917                                                                         NetConn_Write(mysocket, "\377\377\377\377accept", 10, peeraddress);
 918 #else
 919                                                                         SZ_Clear(&net_message);
 920                                                                         // save space for the header, filled in later
 921                                                                         MSG_WriteLong(&net_message, 0);
 922                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
 923                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
 924                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 925                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
 926                                                                         SZ_Clear(&net_message);
 927 #endif
 928                                                                 }
 929                                                                 else
 930                                                                 {
 931                                                                         //if (developer.integer)
 932                                                                                 Con_Printf("Datagram_ParseConnectionless: removing crashed/disconnected client #%i \"%s\" (address %s).\n", clientnum, client->name, client->netconnection->address);
 933                                                                         // it's somebody coming back from a
 934                                                                         // crash/disconnect so kill old connection
 935                                                                         // asap and let them retry to get in
 936                                                                         client->deadsocket = true;
 937                                                                 }
 938                                                         }
 939                                                         else
 940                                                         {
 941                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
 942                                                                         if (!client->active)
 943                                                                                 break;
 944                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
 945                                                                 {
 946                                                                         // connect to the client
 947                                                                         // everything is allocated, just fill in the details
 948                                                                         strcpy(conn->address, addressstring2);
 949                                                                         //if (developer.integer)
 950                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
 951 #if 0
 952                                                                         NetConn_Write(mysocket, "\377\377\377\377accept", 10, peeraddress);
 953 #else
 954                                                                         // send back the info about the server connection
 955                                                                         SZ_Clear(&net_message);
 956                                                                         // save space for the header, filled in later
 957                                                                         MSG_WriteLong(&net_message, 0);
 958                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
 959                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
 960                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 961                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
 962                                                                         SZ_Clear(&net_message);
 963 #endif
 964                                                                         // now set up the client struct
 965                                                                         SV_ConnectClient(clientnum, conn);
 966                                                                         NetConn_Heartbeat(1);
 967                                                                 }
 968                                                                 else
 969                                                                 {
 970                                                                         //if (developer.integer)
 971                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
 972                                                                         // no room; try to let player know
 973 #if 0
 974                                                                         NetConn_Write(mysocket, "\377\377\377\377reject Server is full.", 26, peeraddress);
 975 #else
 976                                                                         SZ_Clear(&net_message);
 977                                                                         // save space for the header, filled in later
 978                                                                         MSG_WriteLong(&net_message, 0);
 979                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
 980                                                                         MSG_WriteString(&net_message, "Server is full.\n");
 981                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 982                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
 983                                                                         SZ_Clear(&net_message);
 984 #endif
 985                                                                 }
 986                                                         }
 987                                                 }
 988                                         }
 989                                         break;
 990 #if 0
 991                                 case CCREQ_SERVER_INFO:
 992                                         if (developer.integer)
 993                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
 994                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
 995                                         {
 996                                                 if (developer.integer)
 997                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
 998                                                 SZ_Clear(&net_message);
 999                                                 // save space for the header, filled in later
1000                                                 MSG_WriteLong(&net_message, 0);
1001                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1002                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1003                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1004                                                 MSG_WriteString(&net_message, hostname.string);
1005                                                 MSG_WriteString(&net_message, sv.name);
1006                                                 MSG_WriteByte(&net_message, net_activeconnections);
1007                                                 MSG_WriteByte(&net_message, svs.maxclients);
1008                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1009                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1010                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1011                                                 SZ_Clear(&net_message);
1012                                         }
1013                                         break;
1014                                 case CCREQ_PLAYER_INFO:
1015                                         if (developer.integer)
1016                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1017                                         if (sv.active)
1018                                         {
1019                                                 int playerNumber, activeNumber, clientNumber;
1020                                                 client_t *client;
1021
1022                                                 playerNumber = MSG_ReadByte();
1023                                                 activeNumber = -1;
1024                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1025                                                         if (client->active && ++activeNumber == playerNumber)
1026                                                                 break;
1027                                                 if (clientNumber != svs.maxclients)
1028                                                 {
1029                                                         SZ_Clear(&net_message);
1030                                                         // save space for the header, filled in later
1031                                                         MSG_WriteLong(&net_message, 0);
1032                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1033                                                         MSG_WriteByte(&net_message, playerNumber);
1034                                                         MSG_WriteString(&net_message, client->name);
1035                                                         MSG_WriteLong(&net_message, client->colors);
1036                                                         MSG_WriteLong(&net_message, (int)client->edict->v->frags);
1037                                                         MSG_WriteLong(&net_message, (int)(realtime - client->netconnection->connecttime));
1038                                                         MSG_WriteString(&net_message, client->netconnection->address);
1039                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1040                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1041                                                         SZ_Clear(&net_message);
1042                                                 }
1043                                         }
1044                                         break;
1045                                 case CCREQ_RULE_INFO:
1046                                         if (developer.integer)
1047                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1048                                         if (sv.active)
1049                                         {
1050                                                 char *prevCvarName;
1051                                                 cvar_t *var;
1052
1053                                                 // find the search start location
1054                                                 prevCvarName = MSG_ReadString();
1055                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1056
1057                                                 // send the response
1058                                                 SZ_Clear(&net_message);
1059                                                 // save space for the header, filled in later
1060                                                 MSG_WriteLong(&net_message, 0);
1061                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1062                                                 if (var)
1063                                                 {
1064                                                         MSG_WriteString(&net_message, var->name);
1065                                                         MSG_WriteString(&net_message, var->string);
1066                                                 }
1067                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1068                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1069                                                 SZ_Clear(&net_message);
1070                                         }
1071                                         break;
1072 #endif
1073                                 default:
1074                                         break;
1075                                 }
1076 #endif
1077                                 // we may not have liked the packet, but it was a valid control
1078                                 // packet, so we're done processing this packet now
1079                                 return true;
1080                         }
1081                 }
1082                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1083                 {
1084                         if (host_client->active && host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1085                         {
1086                                 sv_player = host_client->edict;
1087                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1088                                         SV_ReadClientMessage();
1089                                 return ret;
1090                         }
1091                 }
1092         }
1093         return 0;
1094 }
1095
1096 void NetConn_ServerFrame(void)
1097 {
1098         int i, length;
1099         lhnetaddress_t peeraddress;
1100         netconn_t *conn;
1101         NetConn_UpdateServerStuff();
1102         for (i = 0;i < sv_numsockets;i++)
1103                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1104                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1105         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++)
1106         {
1107                 if (host_client->active && realtime > host_client->netconnection->lastMessageTime + net_messagetimeout.value)
1108                 {
1109                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1110                         sv_player = host_client->edict;
1111                         SV_DropClient(false);
1112                 }
1113         }
1114         for (conn = netconn_list;conn;conn = conn->next)
1115                 NetConn_ReSendMessage(conn);
1116 }
1117
1118 void NetConn_QueryMasters(void)
1119 {
1120         int i;
1121         int masternum;
1122         int requestlen;
1123         lhnetaddress_t masteraddress;
1124         char request[256];
1125
1126         if (hostCacheCount >= HOSTCACHESIZE)
1127                 return;
1128
1129         for (i = 0;i < cl_numsockets;i++)
1130         {
1131                 if (cl_sockets[i])
1132                 {
1133 #if 0
1134                         // search LAN
1135 #if 1
1136                         UDP_Broadcast(UDP_controlSock, "\377\377\377\377getinfo", 11);
1137 #else
1138                         SZ_Clear(&net_message);
1139                         // save space for the header, filled in later
1140                         MSG_WriteLong(&net_message, 0);
1141                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1142                         MSG_WriteString(&net_message, "QUAKE");
1143                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1144                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1145                         UDP_Broadcast(UDP_controlSock, net_message.data, net_message.cursize);
1146                         SZ_Clear(&net_message);
1147 #endif
1148 #endif
1149
1150                         // build the getservers
1151                         requestlen = snprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1152
1153                         // search internet
1154                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1155                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1156                                         NetConn_Write(cl_sockets[i], request, requestlen, &masteraddress);
1157                 }
1158         }
1159 }
1160
1161 void NetConn_Heartbeat(int priority)
1162 {
1163         lhnetaddress_t masteraddress;
1164         int masternum;
1165         char *request = "\377\377\377\377heartbeat DarkPlaces\x0A";
1166         int requestlen = strlen(request);
1167         lhnetsocket_t *mysocket;
1168
1169         // if it's a state change (client connected), limit next heartbeat to no
1170         // more than 30 sec in the future
1171         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1172                 nextheartbeattime = realtime + 30.0;
1173
1174         // limit heartbeatperiod to 30 to 270 second range,
1175         // lower limit is to avoid abusing master servers with excess traffic,
1176         // upper limit is to avoid timing out on the master server (which uses
1177         // 300 sec timeout)
1178         if (sv_heartbeatperiod.value < 30)
1179                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1180         if (sv_heartbeatperiod.value > 270)
1181                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1182
1183         // make advertising optional and don't advertise singleplayer games, and
1184         // only send a heartbeat as often as the admin wants
1185         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1186         {
1187                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1188                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1189                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1190                                 NetConn_Write(mysocket, request, requestlen, &masteraddress);
1191         }
1192 }
1193
1194 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1195 {
1196         int i, count = 0;
1197         qbyte state[MAX_SCOREBOARD];
1198
1199         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1200                 state[i] = 0;
1201
1202         // simultaneously wait for the first CanSendMessage and send the message,
1203         // then wait for a second CanSendMessage (verifying it was received)
1204         blocktime += Sys_DoubleTime();
1205         do
1206         {
1207                 count = 0;
1208                 NetConn_ClientFrame();
1209                 NetConn_ServerFrame();
1210                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1211                 {
1212                         if (host_client->active && state[i] < 2)
1213                         {
1214                                 count++;
1215                                 // need to send to this one
1216                                 if (NetConn_CanSendMessage(host_client->netconnection))
1217                                 {
1218                                         if (state[i] == 0 && NetConn_SendReliableMessage(host_client->netconnection, data) == -1)
1219                                                 state[i] = 2; // connection lost
1220                                         state[i]++;
1221                                 }
1222                         }
1223                 }
1224         }
1225         while (count && Sys_DoubleTime() < blocktime);
1226         return count;
1227 }
1228
1229 static void MaxPlayers_f(void)
1230 {
1231         int n;
1232
1233         if (Cmd_Argc() != 2)
1234         {
1235                 Con_Printf("\"maxplayers\" is \"%u\"\n", svs.maxclients);
1236                 return;
1237         }
1238
1239         if (sv.active)
1240         {
1241                 Con_Printf("maxplayers can not be changed while a server is running.\n");
1242                 return;
1243         }
1244
1245         n = atoi(Cmd_Argv(1));
1246         n = bound(1, n, MAX_SCOREBOARD);
1247         if (svs.maxclients != n)
1248                 Con_Printf("\"maxplayers\" set to \"%u\"\n", n);
1249
1250         SV_SetMaxClients(n);
1251 }
1252
1253 static void Net_Heartbeat_f(void)
1254 {
1255         NetConn_Heartbeat(2);
1256 }
1257
1258 void PrintStats(netconn_t *conn)
1259 {
1260         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1261 }
1262
1263 void Net_Stats_f(void)
1264 {
1265         netconn_t *conn;
1266         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1267         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1268         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1269         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1270         Con_Printf("packetsSent                = %i\n", packetsSent);
1271         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1272         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1273         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1274         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1275         Con_Printf("connections                =\n");
1276         for (conn = netconn_list;conn;conn = conn->next)
1277                 PrintStats(conn);
1278 }
1279
1280 void Net_Slist_f(void)
1281 {
1282         hostCacheCount = 0;
1283         memset(&pingcache, 0, sizeof(pingcache));
1284         if (m_state != m_slist)
1285                 Con_Printf("Sending requests to master servers\n");
1286         NetConn_QueryMasters();
1287         if (m_state != m_slist)
1288                 Con_Printf("Listening for replies...\n");
1289 }
1290
1291 void NetConn_Init(void)
1292 {
1293         int masternum;
1294         netconn_mempool = Mem_AllocPool("Networking");
1295         Cmd_AddCommand("net_stats", Net_Stats_f);
1296         Cmd_AddCommand("net_slist", Net_Slist_f);
1297         Cmd_AddCommand("maxplayers", MaxPlayers_f);
1298         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
1299         Cvar_RegisterVariable(&net_messagetimeout);
1300         Cvar_RegisterVariable(&hostname);
1301         Cvar_RegisterVariable(&developer_networking);
1302         Cvar_RegisterVariable(&cl_netport);
1303         Cvar_RegisterVariable(&cl_netaddress);
1304         Cvar_RegisterVariable(&cl_netaddress_ipv6);
1305         Cvar_RegisterVariable(&sv_netport);
1306         Cvar_RegisterVariable(&sv_netaddress);
1307         Cvar_RegisterVariable(&sv_netaddress_ipv6);
1308         Cvar_RegisterVariable(&sv_public);
1309         Cvar_RegisterVariable(&sv_heartbeatperiod);
1310         for (masternum = 0;sv_masters[masternum].name;masternum++)
1311                 Cvar_RegisterVariable(&sv_masters[masternum]);
1312         cl_numsockets = 0;
1313         sv_numsockets = 0;
1314         memset(&pingcache, 0, sizeof(pingcache));
1315         SZ_Alloc(&net_message, NET_MAXMESSAGE, "net_message");
1316         LHNET_Init();
1317 }
1318
1319 void NetConn_Shutdown(void)
1320 {
1321         NetConn_CloseClientPorts();
1322         NetConn_CloseServerPorts();
1323         LHNET_Shutdown();
1324 }
1325