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                         c = -1;
 564                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strncpy(game, s, sizeof(game) - 1);
 565                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strncpy(mod , s, sizeof(mod ) - 1);
 566                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strncpy(map , s, sizeof(map ) - 1);
 567                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strncpy(name, s, sizeof(name) - 1);
 568                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) c = atoi(s);
 569                         if ((s = SearchInfostring(string, "clients"      )) != NULL) users = atoi(s);
 570                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) maxusers = atoi(s);
 571                         pingtime = 9999;
 572                         for (i = 0;i < HOSTCACHESIZE;i++)
 573                                 if (!LHNETADDRESS_Compare(peeraddress, &pingcache[i].peeraddress))
 574                                         pingtime = (int)(realtime - pingcache[i].senttime);
 575                         pingtime = bound(0, pingtime, 9999);
 576                         memset(&hostcache[n], 0, sizeof(hostcache[n]));
 577                         // store the data the engine cares about (address and ping)
 578                         strcpy(hostcache[n].cname, cname);
 579                         hostcache[n].ping = pingtime;
 580                         // build description strings for the things users care about
 581                         snprintf(hostcache[n].line1, sizeof(hostcache[n].line1), "%5d%c%3u/%3u %-65.65s", (int)pingtime, c != NET_PROTOCOL_VERSION ? '*' : ' ', users, maxusers, name);
 582                         snprintf(hostcache[n].line2, sizeof(hostcache[n].line2), "%-21.21s %-19.19s %-17.17s %-20.20s", cname, game, mod, map);
 583                         // if ping is especially high, display it as such
 584                         if (pingtime >= 300)
 585                         {
 586                                 // orange numbers (lower block)
 587                                 for (i = 0;i < 5;i++)
 588                                         if (hostcache[n].line1[i] != ' ')
 589                                                 hostcache[n].line1[i] += 128;
 590                         }
 591                         else if (pingtime >= 200)
 592                         {
 593                                 // yellow numbers (in upper block)
 594                                 for (i = 0;i < 5;i++)
 595                                         if (hostcache[n].line1[i] != ' ')
 596                                                 hostcache[n].line1[i] -= 30;
 597                         }
 598                         // if not in the slist menu we should print the server to console
 599                         if (m_state != m_slist)
 600                                 Con_Printf("%s\n%s\n", hostcache[n].line1, hostcache[n].line2);
 601                         // and finally, re-sort the list
 602                         for (i = 0;i < hostCacheCount;i++)
 603                         {
 604                                 for (j = i + 1;j < hostCacheCount;j++)
 605                                 {
 606                                         //if (strcmp(hostcache[j].name, hostcache[i].name) < 0)
 607                                         if (hostcache[i].ping > hostcache[j].ping)
 608                                         {
 609                                                 memcpy(&temp, &hostcache[j], sizeof(hostcache_t));
 610                                                 memcpy(&hostcache[j], &hostcache[i], sizeof(hostcache_t));
 611                                                 memcpy(&hostcache[i], &temp, sizeof(hostcache_t));
 612                                         }
 613                                 }
 614                         }
 615                         return true;
 616                 }
 617                 if (!strncmp(string, "getserversResponse\\", 19) && hostCacheCount < HOSTCACHESIZE)
 618                 {
 619                         int i, best;
 620                         double besttime;
 621                         // Extract the IP addresses
 622                         data += 18;
 623                         length -= 18;
 624                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
 625                         {
 626                                 sprintf(ipstring, "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
 627                                 if (developer.integer)
 628                                         Con_Printf("Requesting info from server %s\n", ipstring);
 629                                 LHNETADDRESS_FromString(&svaddress, ipstring, 0);
 630                                 NetConn_Write(mysocket, "\377\377\377\377getinfo", 11, &svaddress);
 631                                 // replace oldest or matching entry in ping cache
 632                                 // we scan this later when getting a reply to see how long it took
 633                                 besttime = realtime;
 634                                 best = 0;
 635                                 for (i = 0;i < HOSTCACHESIZE;i++)
 636                                 {
 637                                         if (!LHNETADDRESS_Compare(&svaddress, &pingcache[i].peeraddress))
 638                                         {
 639                                                 best = i;
 640                                                 break;
 641                                         }
 642                                         if (besttime > pingcache[i].senttime)
 643                                         {
 644                                                 besttime = pingcache[i].senttime;
 645                                                 best = i;
 646                                                 // if ping cache isn't full yet we can skip out early
 647                                                 if (!besttime)
 648                                                         break;
 649                                         }
 650                                 }
 651                                 pingcache[best].peeraddress = svaddress;
 652                                 pingcache[best].senttime = realtime;
 653                                 // move on to next address in packet
 654                                 data += 7;
 655                                 length -= 7;
 656                         }
 657                         return true;
 658                 }
 659                 /*
 660                 if (!strncmp(string, "ping", 4))
 661                 {
 662                         if (developer.integer)
 663                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
 664                         NetConn_Write(mysocket, "\377\377\377\377ack", 7, peeraddress);
 665                         return true;
 666                 }
 667                 if (!strncmp(string, "ack", 3))
 668                         return true;
 669                 */
 670                 // we may not have liked the packet, but it was a command packet, so
 671                 // we're done processing this packet now
 672                 return true;
 673         }
 674         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
 675         {
 676                 c = data[4];
 677                 data += 5;
 678                 length -= 5;
 679                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 680                 switch (c)
 681                 {
 682                 case CCREP_ACCEPT:
 683                         if (developer.integer)
 684                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
 685                         if (cls.connect_trying)
 686                         {
 687                                 Con_Printf("Connection accepted to %s\n", addressstring2);
 688                                 key_dest = key_game;
 689                                 m_state = m_none;
 690                                 cls.netcon = NetConn_Open(mysocket, peeraddress);
 691                                 cls.connect_trying = false;
 692                                 cls.demonum = -1;                       // not in the demo loop now
 693                                 cls.state = ca_connected;
 694                                 cls.signon = 0;                         // need all the signon messages before playing
 695                                 CL_ClearState();
 696                                 Host_Reconnect_f();
 697                         }
 698                         break;
 699                 case CCREP_REJECT:
 700                         if (developer.integer)
 701                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
 702                         Con_Printf("%s\n", data);
 703                         strncpy(m_return_reason, data, sizeof(m_return_reason) - 1);
 704                         break;
 705 #if 0
 706                 case CCREP_SERVER_INFO:
 707                         if (developer.integer)
 708                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
 709                         if (cls.state != ca_dedicated)
 710                         {
 711                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
 712                                 // string we just ignore it and keep the real address
 713                                 MSG_ReadString();
 714                                 // hostcache only uses text addresses
 715                                 cname = UDP_AddrToString(readaddr);
 716                                 // search the cache for this server
 717                                 for (n = 0; n < hostCacheCount; n++)
 718                                         if (!strcmp(cname, hostcache[n].cname))
 719                                                 break;
 720                                 // add it
 721                                 if (n == hostCacheCount && hostCacheCount < HOSTCACHESIZE)
 722                                 {
 723                                         hostCacheCount++;
 724                                         memset(&hostcache[n], 0, sizeof(hostcache[n]));
 725                                         strcpy(hostcache[n].name, MSG_ReadString());
 726                                         strcpy(hostcache[n].map, MSG_ReadString());
 727                                         hostcache[n].users = MSG_ReadByte();
 728                                         hostcache[n].maxusers = MSG_ReadByte();
 729                                         c = MSG_ReadByte();
 730                                         if (c != NET_PROTOCOL_VERSION)
 731                                         {
 732                                                 strncpy(hostcache[n].cname, hostcache[n].name, sizeof(hostcache[n].cname) - 1);
 733                                                 hostcache[n].cname[sizeof(hostcache[n].cname) - 1] = 0;
 734                                                 strcpy(hostcache[n].name, "*");
 735                                                 strncat(hostcache[n].name, hostcache[n].cname, sizeof(hostcache[n].name) - 1);
 736                                                 hostcache[n].name[sizeof(hostcache[n].name) - 1] = 0;
 737                                         }
 738                                         strcpy(hostcache[n].cname, cname);
 739                                 }
 740                         }
 741                         break;
 742                 case CCREP_PLAYER_INFO:
 743                         // we got a CCREP_PLAYER_INFO??
 744                         //if (developer.integer)
 745                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
 746                         break;
 747                 case CCREP_RULE_INFO:
 748                         // we got a CCREP_RULE_INFO??
 749                         //if (developer.integer)
 750                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
 751                         break;
 752 #endif
 753                 default:
 754                         break;
 755                 }
 756                 // we may not have liked the packet, but it was a valid control
 757                 // packet, so we're done processing this packet now
 758                 return true;
 759         }
 760         ret = 0;
 761         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)
 762                 CL_ParseServerMessage();
 763         return ret;
 764 }
 765
 766 void NetConn_ClientFrame(void)
 767 {
 768         int i, length;
 769         lhnetaddress_t peeraddress;
 770         netconn_t *conn;
 771         NetConn_UpdateServerStuff();
 772         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
 773         {
 774                 if (cls.connect_remainingtries == 0)
 775                 {
 776                         cls.connect_trying = false;
 777                         Host_Error("Connect failed\n");
 778                         return;
 779                 }
 780                 if (cls.connect_nextsendtime)
 781                         Con_Printf("Still trying...\n");
 782                 else
 783                         Con_Printf("Trying...\n");
 784                 cls.connect_nextsendtime = realtime + 1;
 785                 cls.connect_remainingtries--;
 786                 SZ_Clear(&net_message);
 787                 // save space for the header, filled in later
 788                 MSG_WriteLong(&net_message, 0);
 789                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
 790                 MSG_WriteString(&net_message, "QUAKE");
 791                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
 792                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 793                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
 794                 SZ_Clear(&net_message);
 795         }
 796         for (i = 0;i < cl_numsockets;i++)
 797                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
 798                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
 799         if (cls.netcon && realtime > cls.netcon->lastMessageTime + net_messagetimeout.value)
 800         {
 801                 Con_Printf("Connection timed out\n");
 802                 CL_Disconnect();
 803         }
 804         for (conn = netconn_list;conn;conn = conn->next)
 805                 NetConn_ReSendMessage(conn);
 806 }
 807
 808 extern void SV_ConnectClient(int clientnum, netconn_t *netconnection);
 809 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 810 {
 811         int i, c, n, ret, clientnum, control, responselength;
 812         client_t *client;
 813         netconn_t *conn;
 814         char *string, response[512], addressstring2[128];
 815
 816         if (sv.active)
 817         {
 818                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 819                 {
 820                         data += 4;
 821                         length -= 4;
 822                         string = (char *)data;
 823
 824                         if (developer.integer)
 825                         {
 826                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 827                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
 828                                 Com_HexDumpToConsole(data, length);
 829                         }
 830
 831                         if (length >= 7 && !memcmp(string, "getinfo", 7))
 832                         {
 833                                 const char *challenge = NULL;
 834                                 // If there was a challenge in the getinfo message
 835                                 if (length > 8 && string[7] == ' ')
 836                                         challenge = string + 8;
 837                                 for (i = 0, n = 0;i < svs.maxclients;i++)
 838                                         if (svs.clients[i].active)
 839                                                 n++;
 840                                 responselength = snprintf(response, sizeof(response), "\377\377\377\377infoResponse\x0A"
 841                                                         "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
 842                                                         "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d%s%s",
 843                                                         gamename, com_modname, svs.maxclients, n,
 844                                                         sv.name, hostname.string, NET_PROTOCOL_VERSION, challenge ? "\\challenge\\" : "", challenge ? challenge : "");
 845                                 // does it fit in the buffer?
 846                                 if (responselength < (int)sizeof(response))
 847                                 {
 848                                         if (developer.integer)
 849                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
 850                                         NetConn_Write(mysocket, response, responselength, peeraddress);
 851                                 }
 852                                 return true;
 853                         }
 854                         /*
 855                         if (!strncmp(string, "ping", 4))
 856                         {
 857                                 if (developer.integer)
 858                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
 859                                 NetConn_Write(mysocket, "\377\377\377\377ack", 7, peeraddress);
 860                                 return true;
 861                         }
 862                         if (!strncmp(string, "ack", 3))
 863                                 return true;
 864                         */
 865                         // we may not have liked the packet, but it was a command packet, so
 866                         // we're done processing this packet now
 867                         return true;
 868                 }
 869                 if (length >= 5)
 870                 {
 871                         control = BigLong(*((int *)data));
 872                         if ((control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
 873                         {
 874                                 c = data[4];
 875                                 data += 5;
 876                                 length -= 5;
 877                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 878 #if 1
 879                                 switch (c)
 880                                 {
 881                                 case CCREQ_CONNECT:
 882                                         //if (developer.integer)
 883                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
 884                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
 885                                         {
 886                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
 887                                                 {
 888                                                         //if (developer.integer)
 889                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
 890 #if 0
 891                                                         NetConn_Write(mysocket, "\377\377\377\377reject Incompatible version.", 32, peeraddress);
 892 #else
 893                                                         SZ_Clear(&net_message);
 894                                                         // save space for the header, filled in later
 895                                                         MSG_WriteLong(&net_message, 0);
 896                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
 897                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
 898                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 899                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
 900                                                         SZ_Clear(&net_message);
 901 #endif
 902                                                 }
 903                                                 else
 904                                                 {
 905                                                         // see if this client is already connected
 906                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
 907                                                                 if (client->active && (ret = LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress)) == 0)//>= 0)
 908                                                                         break;
 909                                                         if (clientnum < svs.maxclients)
 910                                                         {
 911                                                                 // is this a duplicate connection request?
 912                                                                 if (ret == 0 && realtime - client->netconnection->connecttime < 2.0)
 913                                                                 {
 914                                                                         //if (developer.integer)
 915                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
 916                                                                         // yes, so send a duplicate reply
 917 #if 0
 918                                                                         NetConn_Write(mysocket, "\377\377\377\377accept", 10, peeraddress);
 919 #else
 920                                                                         SZ_Clear(&net_message);
 921                                                                         // save space for the header, filled in later
 922                                                                         MSG_WriteLong(&net_message, 0);
 923                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
 924                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
 925                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 926                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
 927                                                                         SZ_Clear(&net_message);
 928 #endif
 929                                                                 }
 930                                                                 else
 931                                                                 {
 932                                                                         //if (developer.integer)
 933                                                                                 Con_Printf("Datagram_ParseConnectionless: removing crashed/disconnected client #%i \"%s\" (address %s).\n", clientnum, client->name, client->netconnection->address);
 934                                                                         // it's somebody coming back from a
 935                                                                         // crash/disconnect so kill old connection
 936                                                                         // asap and let them retry to get in
 937                                                                         client->deadsocket = true;
 938                                                                 }
 939                                                         }
 940                                                         else
 941                                                         {
 942                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
 943                                                                         if (!client->active)
 944                                                                                 break;
 945                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
 946                                                                 {
 947                                                                         // connect to the client
 948                                                                         // everything is allocated, just fill in the details
 949                                                                         strcpy(conn->address, addressstring2);
 950                                                                         //if (developer.integer)
 951                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
 952 #if 0
 953                                                                         NetConn_Write(mysocket, "\377\377\377\377accept", 10, peeraddress);
 954 #else
 955                                                                         // send back the info about the server connection
 956                                                                         SZ_Clear(&net_message);
 957                                                                         // save space for the header, filled in later
 958                                                                         MSG_WriteLong(&net_message, 0);
 959                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
 960                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
 961                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 962                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
 963                                                                         SZ_Clear(&net_message);
 964 #endif
 965                                                                         // now set up the client struct
 966                                                                         SV_ConnectClient(clientnum, conn);
 967                                                                         NetConn_Heartbeat(1);
 968                                                                 }
 969                                                                 else
 970                                                                 {
 971                                                                         //if (developer.integer)
 972                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
 973                                                                         // no room; try to let player know
 974 #if 0
 975                                                                         NetConn_Write(mysocket, "\377\377\377\377reject Server is full.", 26, peeraddress);
 976 #else
 977                                                                         SZ_Clear(&net_message);
 978                                                                         // save space for the header, filled in later
 979                                                                         MSG_WriteLong(&net_message, 0);
 980                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
 981                                                                         MSG_WriteString(&net_message, "Server is full.\n");
 982                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 983                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
 984                                                                         SZ_Clear(&net_message);
 985 #endif
 986                                                                 }
 987                                                         }
 988                                                 }
 989                                         }
 990                                         break;
 991 #if 0
 992                                 case CCREQ_SERVER_INFO:
 993                                         if (developer.integer)
 994                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
 995                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
 996                                         {
 997                                                 if (developer.integer)
 998                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
 999                                                 SZ_Clear(&net_message);
1000                                                 // save space for the header, filled in later
1001                                                 MSG_WriteLong(&net_message, 0);
1002                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1003                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1004                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1005                                                 MSG_WriteString(&net_message, hostname.string);
1006                                                 MSG_WriteString(&net_message, sv.name);
1007                                                 MSG_WriteByte(&net_message, net_activeconnections);
1008                                                 MSG_WriteByte(&net_message, svs.maxclients);
1009                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1010                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1011                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1012                                                 SZ_Clear(&net_message);
1013                                         }
1014                                         break;
1015                                 case CCREQ_PLAYER_INFO:
1016                                         if (developer.integer)
1017                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1018                                         if (sv.active)
1019                                         {
1020                                                 int playerNumber, activeNumber, clientNumber;
1021                                                 client_t *client;
1022
1023                                                 playerNumber = MSG_ReadByte();
1024                                                 activeNumber = -1;
1025                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1026                                                         if (client->active && ++activeNumber == playerNumber)
1027                                                                 break;
1028                                                 if (clientNumber != svs.maxclients)
1029                                                 {
1030                                                         SZ_Clear(&net_message);
1031                                                         // save space for the header, filled in later
1032                                                         MSG_WriteLong(&net_message, 0);
1033                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1034                                                         MSG_WriteByte(&net_message, playerNumber);
1035                                                         MSG_WriteString(&net_message, client->name);
1036                                                         MSG_WriteLong(&net_message, client->colors);
1037                                                         MSG_WriteLong(&net_message, (int)client->edict->v->frags);
1038                                                         MSG_WriteLong(&net_message, (int)(realtime - client->netconnection->connecttime));
1039                                                         MSG_WriteString(&net_message, client->netconnection->address);
1040                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1041                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1042                                                         SZ_Clear(&net_message);
1043                                                 }
1044                                         }
1045                                         break;
1046                                 case CCREQ_RULE_INFO:
1047                                         if (developer.integer)
1048                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1049                                         if (sv.active)
1050                                         {
1051                                                 char *prevCvarName;
1052                                                 cvar_t *var;
1053
1054                                                 // find the search start location
1055                                                 prevCvarName = MSG_ReadString();
1056                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1057
1058                                                 // send the response
1059                                                 SZ_Clear(&net_message);
1060                                                 // save space for the header, filled in later
1061                                                 MSG_WriteLong(&net_message, 0);
1062                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1063                                                 if (var)
1064                                                 {
1065                                                         MSG_WriteString(&net_message, var->name);
1066                                                         MSG_WriteString(&net_message, var->string);
1067                                                 }
1068                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1069                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1070                                                 SZ_Clear(&net_message);
1071                                         }
1072                                         break;
1073 #endif
1074                                 default:
1075                                         break;
1076                                 }
1077 #endif
1078                                 // we may not have liked the packet, but it was a valid control
1079                                 // packet, so we're done processing this packet now
1080                                 return true;
1081                         }
1082                 }
1083                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1084                 {
1085                         if (host_client->active && host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1086                         {
1087                                 sv_player = host_client->edict;
1088                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1089                                         SV_ReadClientMessage();
1090                                 return ret;
1091                         }
1092                 }
1093         }
1094         return 0;
1095 }
1096
1097 void NetConn_ServerFrame(void)
1098 {
1099         int i, length;
1100         lhnetaddress_t peeraddress;
1101         netconn_t *conn;
1102         NetConn_UpdateServerStuff();
1103         for (i = 0;i < sv_numsockets;i++)
1104                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1105                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1106         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++)
1107         {
1108                 if (host_client->active && realtime > host_client->netconnection->lastMessageTime + net_messagetimeout.value)
1109                 {
1110                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1111                         sv_player = host_client->edict;
1112                         SV_DropClient(false);
1113                 }
1114         }
1115         for (conn = netconn_list;conn;conn = conn->next)
1116                 NetConn_ReSendMessage(conn);
1117 }
1118
1119 void NetConn_QueryMasters(void)
1120 {
1121         int i;
1122         int masternum;
1123         int requestlen;
1124         lhnetaddress_t masteraddress;
1125         char request[256];
1126
1127         if (hostCacheCount >= HOSTCACHESIZE)
1128                 return;
1129
1130         for (i = 0;i < cl_numsockets;i++)
1131         {
1132                 if (cl_sockets[i])
1133                 {
1134 #if 0
1135                         // search LAN
1136 #if 1
1137                         UDP_Broadcast(UDP_controlSock, "\377\377\377\377getinfo", 11);
1138 #else
1139                         SZ_Clear(&net_message);
1140                         // save space for the header, filled in later
1141                         MSG_WriteLong(&net_message, 0);
1142                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1143                         MSG_WriteString(&net_message, "QUAKE");
1144                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1145                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1146                         UDP_Broadcast(UDP_controlSock, net_message.data, net_message.cursize);
1147                         SZ_Clear(&net_message);
1148 #endif
1149 #endif
1150
1151                         // build the getservers
1152                         requestlen = snprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1153
1154                         // search internet
1155                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1156                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1157                                         NetConn_Write(cl_sockets[i], request, requestlen, &masteraddress);
1158                 }
1159         }
1160 }
1161
1162 void NetConn_Heartbeat(int priority)
1163 {
1164         lhnetaddress_t masteraddress;
1165         int masternum;
1166         char *request = "\377\377\377\377heartbeat DarkPlaces\x0A";
1167         int requestlen = strlen(request);
1168         lhnetsocket_t *mysocket;
1169
1170         // if it's a state change (client connected), limit next heartbeat to no
1171         // more than 30 sec in the future
1172         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1173                 nextheartbeattime = realtime + 30.0;
1174
1175         // limit heartbeatperiod to 30 to 270 second range,
1176         // lower limit is to avoid abusing master servers with excess traffic,
1177         // upper limit is to avoid timing out on the master server (which uses
1178         // 300 sec timeout)
1179         if (sv_heartbeatperiod.value < 30)
1180                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1181         if (sv_heartbeatperiod.value > 270)
1182                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1183
1184         // make advertising optional and don't advertise singleplayer games, and
1185         // only send a heartbeat as often as the admin wants
1186         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1187         {
1188                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1189                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1190                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1191                                 NetConn_Write(mysocket, request, requestlen, &masteraddress);
1192         }
1193 }
1194
1195 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1196 {
1197         int i, count = 0;
1198         qbyte state[MAX_SCOREBOARD];
1199
1200         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1201                 state[i] = 0;
1202
1203         // simultaneously wait for the first CanSendMessage and send the message,
1204         // then wait for a second CanSendMessage (verifying it was received)
1205         blocktime += Sys_DoubleTime();
1206         do
1207         {
1208                 count = 0;
1209                 NetConn_ClientFrame();
1210                 NetConn_ServerFrame();
1211                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1212                 {
1213                         if (host_client->active && state[i] < 2)
1214                         {
1215                                 count++;
1216                                 // need to send to this one
1217                                 if (NetConn_CanSendMessage(host_client->netconnection))
1218                                 {
1219                                         if (state[i] == 0 && NetConn_SendReliableMessage(host_client->netconnection, data) == -1)
1220                                                 state[i] = 2; // connection lost
1221                                         state[i]++;
1222                                 }
1223                         }
1224                 }
1225         }
1226         while (count && Sys_DoubleTime() < blocktime);
1227         return count;
1228 }
1229
1230 static void MaxPlayers_f(void)
1231 {
1232         int n;
1233
1234         if (Cmd_Argc() != 2)
1235         {
1236                 Con_Printf("\"maxplayers\" is \"%u\"\n", svs.maxclients);
1237                 return;
1238         }
1239
1240         if (sv.active)
1241         {
1242                 Con_Printf("maxplayers can not be changed while a server is running.\n");
1243                 return;
1244         }
1245
1246         n = atoi(Cmd_Argv(1));
1247         n = bound(1, n, MAX_SCOREBOARD);
1248         if (svs.maxclients != n)
1249                 Con_Printf("\"maxplayers\" set to \"%u\"\n", n);
1250
1251         SV_SetMaxClients(n);
1252 }
1253
1254 static void Net_Heartbeat_f(void)
1255 {
1256         NetConn_Heartbeat(2);
1257 }
1258
1259 void PrintStats(netconn_t *conn)
1260 {
1261         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1262 }
1263
1264 void Net_Stats_f(void)
1265 {
1266         netconn_t *conn;
1267         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1268         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1269         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1270         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1271         Con_Printf("packetsSent                = %i\n", packetsSent);
1272         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1273         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1274         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1275         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1276         Con_Printf("connections                =\n");
1277         for (conn = netconn_list;conn;conn = conn->next)
1278                 PrintStats(conn);
1279 }
1280
1281 void Net_Slist_f(void)
1282 {
1283         hostCacheCount = 0;
1284         memset(&pingcache, 0, sizeof(pingcache));
1285         if (m_state != m_slist)
1286                 Con_Printf("Sending requests to master servers\n");
1287         NetConn_QueryMasters();
1288         if (m_state != m_slist)
1289                 Con_Printf("Listening for replies...\n");
1290 }
1291
1292 void NetConn_Init(void)
1293 {
1294         int masternum;
1295         netconn_mempool = Mem_AllocPool("Networking");
1296         Cmd_AddCommand("net_stats", Net_Stats_f);
1297         Cmd_AddCommand("net_slist", Net_Slist_f);
1298         Cmd_AddCommand("maxplayers", MaxPlayers_f);
1299         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
1300         Cvar_RegisterVariable(&net_messagetimeout);
1301         Cvar_RegisterVariable(&hostname);
1302         Cvar_RegisterVariable(&developer_networking);
1303         Cvar_RegisterVariable(&cl_netport);
1304         Cvar_RegisterVariable(&cl_netaddress);
1305         Cvar_RegisterVariable(&cl_netaddress_ipv6);
1306         Cvar_RegisterVariable(&sv_netport);
1307         Cvar_RegisterVariable(&sv_netaddress);
1308         Cvar_RegisterVariable(&sv_netaddress_ipv6);
1309         Cvar_RegisterVariable(&sv_public);
1310         Cvar_RegisterVariable(&sv_heartbeatperiod);
1311         for (masternum = 0;sv_masters[masternum].name;masternum++)
1312                 Cvar_RegisterVariable(&sv_masters[masternum]);
1313         cl_numsockets = 0;
1314         sv_numsockets = 0;
1315         memset(&pingcache, 0, sizeof(pingcache));
1316         SZ_Alloc(&net_message, NET_MAXMESSAGE, "net_message");
1317         LHNET_Init();
1318 }
1319
1320 void NetConn_Shutdown(void)
1321 {
1322         NetConn_CloseClientPorts();
1323         NetConn_CloseServerPorts();
1324         LHNET_Shutdown();
1325 }
1326