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 // FIXME: resolve DNS on masters whenever their value changes and cache it (to avoid major delays in active servers when they heartbeat)
  32 static cvar_t sv_masters [] =
  33 {
  34         {CVAR_SAVE, "sv_master1", ""},
  35         {CVAR_SAVE, "sv_master2", ""},
  36         {CVAR_SAVE, "sv_master3", ""},
  37         {CVAR_SAVE, "sv_master4", ""},
  38         {0, "sv_masterextra1", "69.59.212.88"}, // ghdigital.com
  39         {0, "sv_masterextra2", "66.169.205.13"}, // dpmaster.deathmask.net
  40         {0, NULL, NULL}
  41 };
  42
  43 static double nextheartbeattime = 0;
  44
  45 sizebuf_t net_message;
  46
  47 cvar_t net_messagetimeout = {0, "net_messagetimeout","300"};
  48 cvar_t net_messagerejointimeout = {0, "net_messagerejointimeout","10"};
  49 cvar_t net_connecttimeout = {0, "net_connecttimeout","10"};
  50 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED"};
  51 cvar_t developer_networking = {0, "developer_networking", "0"};
  52
  53 cvar_t cl_netlocalping = {0, "cl_netlocalping","0"};
  54 static cvar_t cl_netpacketloss = {0, "cl_netpacketloss","0"};
  55
  56
  57 /* statistic counters */
  58 static int packetsSent = 0;
  59 static int packetsReSent = 0;
  60 static int packetsReceived = 0;
  61 static int receivedDuplicateCount = 0;
  62 static int droppedDatagrams = 0;
  63
  64 static int unreliableMessagesSent = 0;
  65 static int unreliableMessagesReceived = 0;
  66 static int reliableMessagesSent = 0;
  67 static int reliableMessagesReceived = 0;
  68
  69 double masterquerytime = -1000;
  70 int masterquerycount = 0;
  71 int masterreplycount = 0;
  72 int serverquerycount = 0;
  73 int serverreplycount = 0;
  74
  75 int hostCacheCount = 0;
  76 hostcache_t hostcache[HOSTCACHESIZE];
  77
  78 static qbyte sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  79 static qbyte readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
  80
  81 int cl_numsockets;
  82 lhnetsocket_t *cl_sockets[16];
  83 int sv_numsockets;
  84 lhnetsocket_t *sv_sockets[16];
  85
  86 netconn_t *netconn_list = NULL;
  87 mempool_t *netconn_mempool = NULL;
  88
  89 cvar_t cl_netport = {0, "cl_port", "0"};
  90 cvar_t sv_netport = {0, "port", "26000"};
  91 cvar_t net_address = {0, "net_address", "0.0.0.0"};
  92 //cvar_t net_netaddress_ipv6 = {0, "net_address_ipv6", "[0:0:0:0:0:0:0:0]"};
  93
  94 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
  95 {
  96         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
  97         int i;
  98         if (cl_netpacketloss.integer)
  99                 for (i = 0;i < cl_numsockets;i++)
 100                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 101                                 return 0;
 102         if (developer_networking.integer && length != 0)
 103         {
 104                 char addressstring[128], addressstring2[128];
 105                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 106                 if (length > 0)
 107                 {
 108                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 109                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
 110                         Com_HexDumpToConsole(data, length);
 111                 }
 112                 else
 113                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
 114         }
 115         return length;
 116 }
 117
 118 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 119 {
 120         int ret;
 121         int i;
 122         if (cl_netpacketloss.integer)
 123                 for (i = 0;i < cl_numsockets;i++)
 124                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
 125                                 return length;
 126         ret = LHNET_Write(mysocket, data, length, peeraddress);
 127         if (developer_networking.integer)
 128         {
 129                 char addressstring[128], addressstring2[128];
 130                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 131                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 132                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 133                 Com_HexDumpToConsole(data, length);
 134         }
 135         return ret;
 136 }
 137
 138 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 139 {
 140         // note this does not include the trailing NULL because we add that in the parser
 141         return NetConn_Write(mysocket, string, strlen(string), peeraddress);
 142 }
 143
 144 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
 145 {
 146         unsigned int packetLen;
 147         unsigned int dataLen;
 148         unsigned int eom;
 149         unsigned int *header;
 150
 151 //#ifdef DEBUG
 152         if (data->cursize == 0)
 153                 Sys_Error("Datagram_SendMessage: zero length message\n");
 154
 155         if (data->cursize > (int)sizeof(conn->sendMessage))
 156                 Sys_Error("Datagram_SendMessage: message too big (%u > %u)\n", data->cursize, sizeof(conn->sendMessage));
 157
 158         if (conn->canSend == false)
 159                 Sys_Error("SendMessage: called with canSend == false\n");
 160 //#endif
 161
 162         memcpy(conn->sendMessage, data->data, data->cursize);
 163         conn->sendMessageLength = data->cursize;
 164
 165         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 166         {
 167                 dataLen = conn->sendMessageLength;
 168                 eom = NETFLAG_EOM;
 169         }
 170         else
 171         {
 172                 dataLen = MAX_PACKETFRAGMENT;
 173                 eom = 0;
 174         }
 175
 176         packetLen = NET_HEADERSIZE + dataLen;
 177
 178         header = (void *)sendbuffer;
 179         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 180         header[1] = BigLong(conn->sendSequence);
 181         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 182
 183         conn->sendSequence++;
 184         conn->canSend = false;
 185
 186         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 187                 return -1;
 188
 189         conn->lastSendTime = realtime;
 190         packetsSent++;
 191         reliableMessagesSent++;
 192         return 1;
 193 }
 194
 195 static void NetConn_SendMessageNext(netconn_t *conn)
 196 {
 197         unsigned int packetLen;
 198         unsigned int dataLen;
 199         unsigned int eom;
 200         unsigned int *header;
 201
 202         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
 203         {
 204                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 205                 {
 206                         dataLen = conn->sendMessageLength;
 207                         eom = NETFLAG_EOM;
 208                 }
 209                 else
 210                 {
 211                         dataLen = MAX_PACKETFRAGMENT;
 212                         eom = 0;
 213                 }
 214
 215                 packetLen = NET_HEADERSIZE + dataLen;
 216
 217                 header = (void *)sendbuffer;
 218                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 219                 header[1] = BigLong(conn->sendSequence);
 220                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 221
 222                 conn->sendSequence++;
 223                 conn->sendNext = false;
 224
 225                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 226                         return;
 227
 228                 conn->lastSendTime = realtime;
 229                 packetsSent++;
 230         }
 231 }
 232
 233 static void NetConn_ReSendMessage(netconn_t *conn)
 234 {
 235         unsigned int packetLen;
 236         unsigned int dataLen;
 237         unsigned int eom;
 238         unsigned int *header;
 239
 240         if (conn->sendMessageLength && !conn->canSend && (realtime - conn->lastSendTime) > 1.0)
 241         {
 242                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 243                 {
 244                         dataLen = conn->sendMessageLength;
 245                         eom = NETFLAG_EOM;
 246                 }
 247                 else
 248                 {
 249                         dataLen = MAX_PACKETFRAGMENT;
 250                         eom = 0;
 251                 }
 252
 253                 packetLen = NET_HEADERSIZE + dataLen;
 254
 255                 header = (void *)sendbuffer;
 256                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 257                 header[1] = BigLong(conn->sendSequence - 1);
 258                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
 259
 260                 conn->sendNext = false;
 261
 262                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 263                         return;
 264
 265                 conn->lastSendTime = realtime;
 266                 packetsReSent++;
 267         }
 268 }
 269
 270 qboolean NetConn_CanSendMessage(netconn_t *conn)
 271 {
 272         return conn->canSend;
 273 }
 274
 275 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
 276 {
 277         int packetLen;
 278         int *header;
 279
 280         packetLen = NET_HEADERSIZE + data->cursize;
 281
 282 //#ifdef DEBUG
 283         if (data->cursize == 0)
 284                 Sys_Error("Datagram_SendUnreliableMessage: zero length message\n");
 285
 286         if (packetLen > (int)sizeof(sendbuffer))
 287                 Sys_Error("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
 288 //#endif
 289
 290         header = (void *)sendbuffer;
 291         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
 292         header[1] = BigLong(conn->unreliableSendSequence);
 293         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
 294
 295         conn->unreliableSendSequence++;
 296
 297         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 298                 return -1;
 299
 300         packetsSent++;
 301         unreliableMessagesSent++;
 302         return 1;
 303 }
 304
 305 void NetConn_CloseClientPorts(void)
 306 {
 307         for (;cl_numsockets > 0;cl_numsockets--)
 308                 if (cl_sockets[cl_numsockets - 1])
 309                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 310 }
 311
 312 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
 313 {
 314         lhnetaddress_t address;
 315         lhnetsocket_t *s;
 316         char addressstring2[1024];
 317         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 318         {
 319                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 320                 {
 321                         cl_sockets[cl_numsockets++] = s;
 322                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 323                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
 324                 }
 325                 else
 326                 {
 327                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 328                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
 329                 }
 330         }
 331         else
 332                 Con_Printf("Client unable to parse address %s\n", addressstring);
 333 }
 334
 335 void NetConn_OpenClientPorts(void)
 336 {
 337         int port;
 338         NetConn_CloseClientPorts();
 339         port = bound(0, cl_netport.integer, 65535);
 340         if (cl_netport.integer != port)
 341                 Cvar_SetValueQuick(&cl_netport, port);
 342         Con_Printf("Client using port %i\n", port);
 343         NetConn_OpenClientPort("local:2", 0);
 344         NetConn_OpenClientPort(net_address.string, port);
 345         //NetConn_OpenClientPort(net_address_ipv6.string, port);
 346 }
 347
 348 void NetConn_CloseServerPorts(void)
 349 {
 350         for (;sv_numsockets > 0;sv_numsockets--)
 351                 if (sv_sockets[sv_numsockets - 1])
 352                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 353 }
 354
 355 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
 356 {
 357         lhnetaddress_t address;
 358         lhnetsocket_t *s;
 359         char addressstring2[1024];
 360         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 361         {
 362                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 363                 {
 364                         sv_sockets[sv_numsockets++] = s;
 365                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 366                         Con_Printf("Server listening on address %s\n", addressstring2);
 367                 }
 368                 else
 369                 {
 370                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 371                         Con_Printf("Server failed to open socket on address %s\n", addressstring2);
 372                 }
 373         }
 374         else
 375                 Con_Printf("Server unable to parse address %s\n", addressstring);
 376 }
 377
 378 void NetConn_OpenServerPorts(int opennetports)
 379 {
 380         int port;
 381         NetConn_CloseServerPorts();
 382         port = bound(0, sv_netport.integer, 65535);
 383         if (port == 0)
 384                 port = 26000;
 385         Con_Printf("Server using port %i\n", port);
 386         if (sv_netport.integer != port)
 387                 Cvar_SetValueQuick(&sv_netport, port);
 388         if (cls.state != ca_dedicated)
 389                 NetConn_OpenServerPort("local:1", 0);
 390         if (opennetports)
 391         {
 392                 NetConn_OpenServerPort(net_address.string, port);
 393                 //NetConn_OpenServerPort(net_address_ipv6.string, port);
 394         }
 395         if (sv_numsockets == 0)
 396                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!\n");
 397 }
 398
 399 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 400 {
 401         int i, a = LHNETADDRESS_GetAddressType(address);
 402         for (i = 0;i < cl_numsockets;i++)
 403                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 404                         return cl_sockets[i];
 405         return NULL;
 406 }
 407
 408 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 409 {
 410         int i, a = LHNETADDRESS_GetAddressType(address);
 411         for (i = 0;i < sv_numsockets;i++)
 412                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 413                         return sv_sockets[i];
 414         return NULL;
 415 }
 416
 417 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 418 {
 419         netconn_t *conn;
 420         conn = Mem_Alloc(netconn_mempool, sizeof(*conn));
 421         conn->mysocket = mysocket;
 422         conn->peeraddress = *peeraddress;
 423         conn->canSend = true;
 424         conn->lastMessageTime = realtime;
 425         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
 426         // reduce effectiveness of connection request floods
 427         conn->timeout = realtime + net_connecttimeout.value;
 428         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
 429         conn->next = netconn_list;
 430         netconn_list = conn;
 431         return conn;
 432 }
 433
 434 void NetConn_Close(netconn_t *conn)
 435 {
 436         netconn_t *c;
 437         // remove connection from list
 438         if (conn == netconn_list)
 439                 netconn_list = conn->next;
 440         else
 441         {
 442                 for (c = netconn_list;c;c = c->next)
 443                 {
 444                         if (c->next == conn)
 445                         {
 446                                 c->next = conn->next;
 447                                 break;
 448                         }
 449                 }
 450                 // not found in list, we'll avoid crashing here...
 451                 if (!c)
 452                         return;
 453         }
 454         // free connection
 455         Mem_Free(conn);
 456 }
 457
 458 static int clientport = -1;
 459 static int clientport2 = -1;
 460 static int hostport = -1;
 461 static void NetConn_UpdateServerStuff(void)
 462 {
 463         if (cls.state != ca_dedicated)
 464         {
 465                 if (clientport2 != cl_netport.integer)
 466                 {
 467                         clientport2 = cl_netport.integer;
 468                         if (cls.state == ca_connected)
 469                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
 470                 }
 471                 if (cls.state == ca_disconnected && clientport != clientport2)
 472                 {
 473                         clientport = clientport2;
 474                         NetConn_CloseClientPorts();
 475                 }
 476                 if (cl_numsockets == 0)
 477                         NetConn_OpenClientPorts();
 478         }
 479
 480         if (hostport != sv_netport.integer)
 481         {
 482                 hostport = sv_netport.integer;
 483                 if (sv.active)
 484                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
 485         }
 486 }
 487
 488 int NetConn_ReceivedMessage(netconn_t *conn, qbyte *data, int length)
 489 {
 490         unsigned int count;
 491         unsigned int flags;
 492         unsigned int sequence;
 493
 494         if (length >= 8)
 495         {
 496                 length = BigLong(((int *)data)[0]);
 497                 flags = length & ~NETFLAG_LENGTH_MASK;
 498                 length &= NETFLAG_LENGTH_MASK;
 499                 // control packets were already handled
 500                 if (!(flags & NETFLAG_CTL))
 501                 {
 502                         sequence = BigLong(((int *)data)[1]);
 503                         packetsReceived++;
 504                         data += 8;
 505                         length -= 8;
 506                         if (flags & NETFLAG_UNRELIABLE)
 507                         {
 508                                 if (sequence >= conn->unreliableReceiveSequence)
 509                                 {
 510                                         if (sequence > conn->unreliableReceiveSequence)
 511                                         {
 512                                                 count = sequence - conn->unreliableReceiveSequence;
 513                                                 droppedDatagrams += count;
 514                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
 515                                         }
 516                                         conn->unreliableReceiveSequence = sequence + 1;
 517                                         conn->lastMessageTime = realtime;
 518                                         conn->timeout = realtime + net_messagetimeout.value;
 519                                         unreliableMessagesReceived++;
 520                                         if (length > 0)
 521                                         {
 522                                                 SZ_Clear(&net_message);
 523                                                 SZ_Write(&net_message, data, length);
 524                                                 MSG_BeginReading();
 525                                                 return 2;
 526                                         }
 527                                 }
 528                                 else
 529                                         Con_DPrint("Got a stale datagram\n");
 530                                 return 1;
 531                         }
 532                         else if (flags & NETFLAG_ACK)
 533                         {
 534                                 if (sequence == (conn->sendSequence - 1))
 535                                 {
 536                                         if (sequence == conn->ackSequence)
 537                                         {
 538                                                 conn->ackSequence++;
 539                                                 if (conn->ackSequence != conn->sendSequence)
 540                                                         Con_DPrint("ack sequencing error\n");
 541                                                 conn->lastMessageTime = realtime;
 542                                                 conn->timeout = realtime + net_messagetimeout.value;
 543                                                 conn->sendMessageLength -= MAX_PACKETFRAGMENT;
 544                                                 if (conn->sendMessageLength > 0)
 545                                                 {
 546                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
 547                                                         conn->sendNext = true;
 548                                                         NetConn_SendMessageNext(conn);
 549                                                 }
 550                                                 else
 551                                                 {
 552                                                         conn->sendMessageLength = 0;
 553                                                         conn->canSend = true;
 554                                                 }
 555                                         }
 556                                         else
 557                                                 Con_DPrint("Duplicate ACK received\n");
 558                                 }
 559                                 else
 560                                         Con_DPrint("Stale ACK received\n");
 561                                 return 1;
 562                         }
 563                         else if (flags & NETFLAG_DATA)
 564                         {
 565                                 unsigned int temppacket[2];
 566                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
 567                                 temppacket[1] = BigLong(sequence);
 568                                 NetConn_Write(conn->mysocket, (qbyte *)temppacket, 8, &conn->peeraddress);
 569                                 if (sequence == conn->receiveSequence)
 570                                 {
 571                                         conn->lastMessageTime = realtime;
 572                                         conn->timeout = realtime + net_messagetimeout.value;
 573                                         conn->receiveSequence++;
 574                                         memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
 575                                         conn->receiveMessageLength += length;
 576                                         if (flags & NETFLAG_EOM)
 577                                         {
 578                                                 reliableMessagesReceived++;
 579                                                 length = conn->receiveMessageLength;
 580                                                 conn->receiveMessageLength = 0;
 581                                                 if (length > 0)
 582                                                 {
 583                                                         SZ_Clear(&net_message);
 584                                                         SZ_Write(&net_message, conn->receiveMessage, length);
 585                                                         MSG_BeginReading();
 586                                                         return 2;
 587                                                 }
 588                                         }
 589                                 }
 590                                 else
 591                                         receivedDuplicateCount++;
 592                                 return 1;
 593                         }
 594                 }
 595         }
 596         return 0;
 597 }
 598
 599 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 600 {
 601         cls.connect_trying = false;
 602         M_Update_Return_Reason("");
 603         // the connection request succeeded, stop current connection and set up a new connection
 604         CL_Disconnect();
 605         cls.netcon = NetConn_Open(mysocket, peeraddress);
 606         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
 607         key_dest = key_game;
 608         m_state = m_none;
 609         cls.demonum = -1;                       // not in the demo loop now
 610         cls.state = ca_connected;
 611         cls.signon = 0;                         // need all the signon messages before playing
 612         CL_ClearState();
 613         SCR_BeginLoadingPlaque();
 614 }
 615
 616 int NetConn_IsLocalGame(void)
 617 {
 618         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
 619                 return true;
 620         return false;
 621 }
 622
 623 static struct
 624 {
 625         double senttime;
 626         lhnetaddress_t peeraddress;
 627 }
 628 pingcache[HOSTCACHESIZE];
 629
 630 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 631 {
 632         int ret, c, control;
 633         lhnetaddress_t svaddress;
 634         const char *s;
 635         char *string, addressstring2[128], cname[128], ipstring[32];
 636         char stringbuf[16384];
 637
 638         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 639         {
 640                 // received a command string - strip off the packaging and put it
 641                 // into our string buffer with NULL termination
 642                 data += 4;
 643                 length -= 4;
 644                 length = min(length, (int)sizeof(stringbuf) - 1);
 645                 memcpy(stringbuf, data, length);
 646                 stringbuf[length] = 0;
 647                 string = stringbuf;
 648
 649                 if (developer.integer)
 650                 {
 651                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 652                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
 653                         Com_HexDumpToConsole(data, length);
 654                 }
 655
 656                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
 657                 {
 658                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 659                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
 660                         M_Update_Return_Reason("Got challenge response");
 661                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\challenge\\%s", string + 10), peeraddress);
 662                         return true;
 663                 }
 664                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
 665                 {
 666                         M_Update_Return_Reason("Accepted");
 667                         NetConn_ConnectionEstablished(mysocket, peeraddress);
 668                         return true;
 669                 }
 670                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
 671                 {
 672                         char rejectreason[32];
 673                         cls.connect_trying = false;
 674                         string += 7;
 675                         length = max(length - 7, (int)sizeof(rejectreason) - 1);
 676                         memcpy(rejectreason, string, length);
 677                         rejectreason[length] = 0;
 678                         M_Update_Return_Reason(rejectreason);
 679                         return true;
 680                 }
 681                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
 682                 {
 683                         int i, j, c, n, users, maxusers;
 684                         char game[32], mod[32], map[32], name[128];
 685                         double pingtime;
 686                         hostcache_t temp;
 687                         string += 13;
 688                         // hostcache only uses text addresses
 689                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
 690                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(game, s, sizeof (game));else game[0] = 0;
 691                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(mod , s, sizeof (mod ));else mod[0]  = 0;
 692                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(map , s, sizeof (map ));else map[0]  = 0;
 693                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(name, s, sizeof (name));else name[0] = 0;
 694                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) c = atoi(s);else c = -1;
 695                         if ((s = SearchInfostring(string, "clients"      )) != NULL) users = atoi(s);else users = 0;
 696                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) maxusers = atoi(s);else maxusers = 0;
 697                         // search the cache for this server and update it
 698                         for (n = 0; n < hostCacheCount; n++)
 699                         {
 700                                 if (!strcmp(cname, hostcache[n].cname))
 701                                 {
 702                                         if (hostcache[n].ping == 100000)
 703                                                 serverreplycount++;
 704                                         pingtime = (int)((realtime - hostcache[n].querytime) * 1000.0);
 705                                         pingtime = bound(0, pingtime, 9999);
 706                                         // update the ping
 707                                         hostcache[n].ping = pingtime;
 708                                         // build description strings for the things users care about
 709                                         snprintf(hostcache[n].line1, sizeof(hostcache[n].line1), "%5d%c%3u/%3u %-65.65s", (int)pingtime, c != NET_PROTOCOL_VERSION ? '*' : ' ', users, maxusers, name);
 710                                         snprintf(hostcache[n].line2, sizeof(hostcache[n].line2), "%-21.21s %-19.19s %-17.17s %-20.20s", cname, game, mod, map);
 711                                         // if ping is especially high, display it as such
 712                                         if (pingtime >= 300)
 713                                         {
 714                                                 // orange numbers (lower block)
 715                                                 for (i = 0;i < 5;i++)
 716                                                         if (hostcache[n].line1[i] != ' ')
 717                                                                 hostcache[n].line1[i] += 128;
 718                                         }
 719                                         else if (pingtime >= 200)
 720                                         {
 721                                                 // yellow numbers (in upper block)
 722                                                 for (i = 0;i < 5;i++)
 723                                                         if (hostcache[n].line1[i] != ' ')
 724                                                                 hostcache[n].line1[i] -= 30;
 725                                         }
 726                                         // if not in the slist menu we should print the server to console
 727                                         if (m_state != m_slist)
 728                                                 Con_Printf("%s\n%s\n", hostcache[n].line1, hostcache[n].line2);
 729                                         // and finally, re-sort the list
 730                                         for (i = 0;i < hostCacheCount;i++)
 731                                         {
 732                                                 for (j = i + 1;j < hostCacheCount;j++)
 733                                                 {
 734                                                         //if (strcmp(hostcache[j].name, hostcache[i].name) < 0)
 735                                                         if (hostcache[i].ping > hostcache[j].ping)
 736                                                         {
 737                                                                 memcpy(&temp, &hostcache[j], sizeof(hostcache_t));
 738                                                                 memcpy(&hostcache[j], &hostcache[i], sizeof(hostcache_t));
 739                                                                 memcpy(&hostcache[i], &temp, sizeof(hostcache_t));
 740                                                         }
 741                                                 }
 742                                         }
 743                                         break;
 744                                 }
 745                         }
 746                         return true;
 747                 }
 748                 if (!strncmp(string, "getserversResponse\\", 19) && hostCacheCount < HOSTCACHESIZE)
 749                 {
 750                         int i, n, j;
 751                         hostcache_t temp;
 752                         // Extract the IP addresses
 753                         data += 18;
 754                         length -= 18;
 755                         masterreplycount++;
 756                         if (m_state != m_slist)
 757                                 Con_Print("received server list...\n");
 758                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
 759                         {
 760                                 snprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
 761                                 if (developer.integer)
 762                                         Con_Printf("Requesting info from server %s\n", ipstring);
 763                                 LHNETADDRESS_FromString(&svaddress, ipstring, 0);
 764                                 NetConn_WriteString(mysocket, "\377\377\377\377getinfo", &svaddress);
 765
 766
 767                                 // add to slist (hostCache)
 768                                 // search the cache for this server
 769                                 for (n = 0; n < hostCacheCount; n++)
 770                                         if (!strcmp(ipstring, hostcache[n].cname))
 771                                                 break;
 772                                 // add it or update it
 773                                 if (n == hostCacheCount)
 774                                 {
 775                                         // if cache is full replace highest ping server (the list is
 776                                         // kept sorted so this is always the last, and if this server
 777                                         // is good it will be sorted into an early part of the list)
 778                                         if (hostCacheCount >= HOSTCACHESIZE)
 779                                                 n = hostCacheCount - 1;
 780                                         else
 781                                         {
 782                                                 serverquerycount++;
 783                                                 hostCacheCount++;
 784                                         }
 785                                 }
 786                                 memset(&hostcache[n], 0, sizeof(hostcache[n]));
 787                                 // store the data the engine cares about (address and ping)
 788                                 strlcpy (hostcache[n].cname, ipstring, sizeof (hostcache[n].cname));
 789                                 hostcache[n].ping = 100000;
 790                                 hostcache[n].querytime = realtime;
 791                                 // build description strings for the things users care about
 792                                 strlcpy (hostcache[n].line1, "?", sizeof (hostcache[n].line1));
 793                                 strlcpy (hostcache[n].line2, ipstring, sizeof (hostcache[n].line2));
 794                                 // if not in the slist menu we should print the server to console
 795                                 if (m_state != m_slist)
 796                                         Con_Printf("querying %s\n", ipstring);
 797                                 // and finally, re-sort the list
 798                                 for (i = 0;i < hostCacheCount;i++)
 799                                 {
 800                                         for (j = i + 1;j < hostCacheCount;j++)
 801                                         {
 802                                                 //if (strcmp(hostcache[j].name, hostcache[i].name) < 0)
 803                                                 if (hostcache[i].ping > hostcache[j].ping)
 804                                                 {
 805                                                         memcpy(&temp, &hostcache[j], sizeof(hostcache_t));
 806                                                         memcpy(&hostcache[j], &hostcache[i], sizeof(hostcache_t));
 807                                                         memcpy(&hostcache[i], &temp, sizeof(hostcache_t));
 808                                                 }
 809                                         }
 810                                 }
 811
 812
 813                                 // move on to next address in packet
 814                                 data += 7;
 815                                 length -= 7;
 816                         }
 817                         return true;
 818                 }
 819                 /*
 820                 if (!strncmp(string, "ping", 4))
 821                 {
 822                         if (developer.integer)
 823                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
 824                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
 825                         return true;
 826                 }
 827                 if (!strncmp(string, "ack", 3))
 828                         return true;
 829                 */
 830                 // we may not have liked the packet, but it was a command packet, so
 831                 // we're done processing this packet now
 832                 return true;
 833         }
 834         // netquake control packets, supported for compatibility only
 835         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
 836         {
 837                 c = data[4];
 838                 data += 5;
 839                 length -= 5;
 840                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 841                 switch (c)
 842                 {
 843                 case CCREP_ACCEPT:
 844                         if (developer.integer)
 845                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
 846                         if (cls.connect_trying)
 847                         {
 848                                 lhnetaddress_t clientportaddress;
 849                                 clientportaddress = *peeraddress;
 850                                 if (length >= 4)
 851                                 {
 852                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
 853                                         data += 4;
 854                                         length -= 4;
 855                                         LHNETADDRESS_SetPort(&clientportaddress, port);
 856                                 }
 857                                 M_Update_Return_Reason("Accepted");
 858                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress);
 859                         }
 860                         break;
 861                 case CCREP_REJECT:
 862                         if (developer.integer)
 863                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
 864                         cls.connect_trying = false;
 865                         M_Update_Return_Reason(data);
 866                         break;
 867 #if 0
 868                 case CCREP_SERVER_INFO:
 869                         if (developer.integer)
 870                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
 871                         if (cls.state != ca_dedicated)
 872                         {
 873                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
 874                                 // string we just ignore it and keep the real address
 875                                 MSG_ReadString();
 876                                 // hostcache only uses text addresses
 877                                 cname = UDP_AddrToString(readaddr);
 878                                 // search the cache for this server
 879                                 for (n = 0; n < hostCacheCount; n++)
 880                                         if (!strcmp(cname, hostcache[n].cname))
 881                                                 break;
 882                                 // add it
 883                                 if (n == hostCacheCount && hostCacheCount < HOSTCACHESIZE)
 884                                 {
 885                                         hostCacheCount++;
 886                                         memset(&hostcache[n], 0, sizeof(hostcache[n]));
 887                                         strlcpy (hostcache[n].name, MSG_ReadString(), sizeof (hostcache[n].name));
 888                                         strlcpy (hostcache[n].map, MSG_ReadString(), sizeof (hostcache[n].map));
 889                                         hostcache[n].users = MSG_ReadByte();
 890                                         hostcache[n].maxusers = MSG_ReadByte();
 891                                         c = MSG_ReadByte();
 892                                         if (c != NET_PROTOCOL_VERSION)
 893                                         {
 894                                                 strlcpy (hostcache[n].cname, hostcache[n].name, sizeof (hostcache[n].cname));
 895                                                 strcpy(hostcache[n].name, "*");
 896                                                 strlcat (hostcache[n].name, hostcache[n].cname, sizeof(hostcache[n].name));
 897                                         }
 898                                         strlcpy (hostcache[n].cname, cname, sizeof (hostcache[n].cname));
 899                                 }
 900                         }
 901                         break;
 902                 case CCREP_PLAYER_INFO:
 903                         // we got a CCREP_PLAYER_INFO??
 904                         //if (developer.integer)
 905                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
 906                         break;
 907                 case CCREP_RULE_INFO:
 908                         // we got a CCREP_RULE_INFO??
 909                         //if (developer.integer)
 910                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
 911                         break;
 912 #endif
 913                 default:
 914                         break;
 915                 }
 916                 // we may not have liked the packet, but it was a valid control
 917                 // packet, so we're done processing this packet now
 918                 return true;
 919         }
 920         ret = 0;
 921         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)
 922                 CL_ParseServerMessage();
 923         return ret;
 924 }
 925
 926 void NetConn_ClientFrame(void)
 927 {
 928         int i, length;
 929         lhnetaddress_t peeraddress;
 930         netconn_t *conn;
 931         NetConn_UpdateServerStuff();
 932         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
 933         {
 934                 if (cls.connect_remainingtries == 0)
 935                 {
 936                         cls.connect_trying = false;
 937                         M_Update_Return_Reason("Connect: Failed");
 938                         return;
 939                 }
 940                 cls.connect_nextsendtime = realtime + 1;
 941                 cls.connect_remainingtries--;
 942                 // try challenge first (newer server)
 943                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
 944                 // then try netquake as a fallback (old server, or netquake)
 945                 SZ_Clear(&net_message);
 946                 // save space for the header, filled in later
 947                 MSG_WriteLong(&net_message, 0);
 948                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
 949                 MSG_WriteString(&net_message, "QUAKE");
 950                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
 951                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 952                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
 953                 SZ_Clear(&net_message);
 954         }
 955         for (i = 0;i < cl_numsockets;i++)
 956                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
 957                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
 958         if (cls.netcon && realtime > cls.netcon->timeout)
 959         {
 960                 Con_Print("Connection timed out\n");
 961                 CL_Disconnect();
 962                 Host_ShutdownServer (false);
 963         }
 964         for (conn = netconn_list;conn;conn = conn->next)
 965                 NetConn_ReSendMessage(conn);
 966 }
 967
 968 #define MAX_CHALLENGES 128
 969 struct
 970 {
 971         lhnetaddress_t address;
 972         double time;
 973         char string[12];
 974 }
 975 challenge[MAX_CHALLENGES];
 976
 977 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
 978 {
 979         int i;
 980         char c;
 981         for (i = 0;i < bufferlength - 1;i++)
 982         {
 983                 do
 984                 {
 985                         c = rand () % (127 - 33) + 33;
 986                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
 987                 buffer[i] = c;
 988         }
 989         buffer[i] = 0;
 990 }
 991
 992 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 993 {
 994         int i, n, ret, clientnum, responselength, best;
 995         double besttime;
 996         client_t *client;
 997         netconn_t *conn;
 998         char *s, *string, response[512], addressstring2[128], stringbuf[16384];
 999
1000         if (sv.active)
1001         {
1002                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1003                 {
1004                         // received a command string - strip off the packaging and put it
1005                         // into our string buffer with NULL termination
1006                         data += 4;
1007                         length -= 4;
1008                         length = min(length, (int)sizeof(stringbuf) - 1);
1009                         memcpy(stringbuf, data, length);
1010                         stringbuf[length] = 0;
1011                         string = stringbuf;
1012
1013                         if (developer.integer)
1014                         {
1015                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1016                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1017                                 Com_HexDumpToConsole(data, length);
1018                         }
1019
1020                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
1021                         {
1022                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1023                                 {
1024                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1025                                                 break;
1026                                         if (besttime > challenge[i].time)
1027                                                 besttime = challenge[best = i].time;
1028                                 }
1029                                 // if we did not find an exact match, choose the oldest and
1030                                 // update address and string
1031                                 if (i == MAX_CHALLENGES)
1032                                 {
1033                                         i = best;
1034                                         challenge[i].address = *peeraddress;
1035                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1036                                 }
1037                                 challenge[i].time = realtime;
1038                                 // send the challenge
1039                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1040                                 return true;
1041                         }
1042                         if (length > 8 && !memcmp(string, "connect\\", 8))
1043                         {
1044                                 string += 7;
1045                                 length -= 7;
1046                                 if ((s = SearchInfostring(string, "challenge")))
1047                                 {
1048                                         // validate the challenge
1049                                         for (i = 0;i < MAX_CHALLENGES;i++)
1050                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1051                                                         break;
1052                                         if (i < MAX_CHALLENGES)
1053                                         {
1054                                                 // check engine protocol
1055                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1056                                                 {
1057                                                         if (developer.integer)
1058                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1059                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1060                                                 }
1061                                                 else
1062                                                 {
1063                                                         // see if this is a duplicate connection request
1064                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1065                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1066                                                                         break;
1067                                                         if (clientnum < svs.maxclients)
1068                                                         {
1069                                                                 // duplicate connection request
1070                                                                 if (realtime - client->connecttime < 2.0)
1071                                                                 {
1072                                                                         // client is still trying to connect,
1073                                                                         // so we send a duplicate reply
1074                                                                         if (developer.integer)
1075                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1076                                                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1077                                                                 }
1078                                                                 // only kick if old connection seems dead
1079                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1080                                                                 {
1081                                                                         // kick off connection and await retry
1082                                                                         client->deadsocket = true;
1083                                                                 }
1084                                                         }
1085                                                         else
1086                                                         {
1087                                                                 // this is a new client, find a slot
1088                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1089                                                                         if (!client->active)
1090                                                                                 break;
1091                                                                 if (clientnum < svs.maxclients)
1092                                                                 {
1093                                                                         // prepare the client struct
1094                                                                         if ((conn = NetConn_Open(mysocket, peeraddress)))
1095                                                                         {
1096                                                                                 // allocated connection
1097                                                                                 LHNETADDRESS_ToString(peeraddress, conn->address, sizeof(conn->address), true);
1098                                                                                 if (developer.integer)
1099                                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1100                                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1101                                                                                 // now set up the client
1102                                                                                 SV_ConnectClient(clientnum, conn);
1103                                                                                 NetConn_Heartbeat(1);
1104                                                                         }
1105                                                                 }
1106                                                                 else
1107                                                                 {
1108                                                                         // server is full
1109                                                                         if (developer.integer)
1110                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1111                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1112                                                                 }
1113                                                         }
1114                                                 }
1115                                         }
1116                                 }
1117                                 return true;
1118                         }
1119                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1120                         {
1121                                 const char *challenge = NULL;
1122                                 // If there was a challenge in the getinfo message
1123                                 if (length > 8 && string[7] == ' ')
1124                                         challenge = string + 8;
1125                                 for (i = 0, n = 0;i < svs.maxclients;i++)
1126                                         if (svs.clients[i].active)
1127                                                 n++;
1128                                 responselength = snprintf(response, sizeof(response), "\377\377\377\377infoResponse\x0A"
1129                                                         "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
1130                                                         "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d%s%s",
1131                                                         gamename, com_modname, svs.maxclients, n,
1132                                                         sv.name, hostname.string, NET_PROTOCOL_VERSION, challenge ? "\\challenge\\" : "", challenge ? challenge : "");
1133                                 // does it fit in the buffer?
1134                                 if (responselength < (int)sizeof(response))
1135                                 {
1136                                         if (developer.integer)
1137                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1138                                         NetConn_WriteString(mysocket, response, peeraddress);
1139                                 }
1140                                 return true;
1141                         }
1142                         /*
1143                         if (!strncmp(string, "ping", 4))
1144                         {
1145                                 if (developer.integer)
1146                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1147                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1148                                 return true;
1149                         }
1150                         if (!strncmp(string, "ack", 3))
1151                                 return true;
1152                         */
1153                         // we may not have liked the packet, but it was a command packet, so
1154                         // we're done processing this packet now
1155                         return true;
1156                 }
1157                 // LordHavoc: disabled netquake control packet support in server
1158 #if 0
1159                 {
1160                         int c, control;
1161                         // netquake control packets, supported for compatibility only
1162                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1163                         {
1164                                 c = data[4];
1165                                 data += 5;
1166                                 length -= 5;
1167                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1168                                 switch (c)
1169                                 {
1170                                 case CCREQ_CONNECT:
1171                                         //if (developer.integer)
1172                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1173                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
1174                                         {
1175                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1176                                                 {
1177                                                         if (developer.integer)
1178                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1179                                                         SZ_Clear(&net_message);
1180                                                         // save space for the header, filled in later
1181                                                         MSG_WriteLong(&net_message, 0);
1182                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1183                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
1184                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1185                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1186                                                         SZ_Clear(&net_message);
1187                                                 }
1188                                                 else
1189                                                 {
1190                                                         // see if this is a duplicate connection request
1191                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1192                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1193                                                                         break;
1194                                                         if (clientnum < svs.maxclients)
1195                                                         {
1196                                                                 // duplicate connection request
1197                                                                 if (realtime - client->connecttime < 2.0)
1198                                                                 {
1199                                                                         // client is still trying to connect,
1200                                                                         // so we send a duplicate reply
1201                                                                         if (developer.integer)
1202                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1203                                                                         SZ_Clear(&net_message);
1204                                                                         // save space for the header, filled in later
1205                                                                         MSG_WriteLong(&net_message, 0);
1206                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1207                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1208                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1209                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1210                                                                         SZ_Clear(&net_message);
1211                                                                 }
1212                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1213                                                                 {
1214                                                                         // the old client hasn't sent us anything
1215                                                                         // in quite a while, so kick off and let
1216                                                                         // the retry take care of it...
1217                                                                         client->deadsocket = true;
1218                                                                 }
1219                                                         }
1220                                                         else
1221                                                         {
1222                                                                 // this is a new client, find a slot
1223                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1224                                                                         if (!client->active)
1225                                                                                 break;
1226                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
1227                                                                 {
1228                                                                         // connect to the client
1229                                                                         // everything is allocated, just fill in the details
1230                                                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
1231                                                                         if (developer.integer)
1232                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
1233                                                                         // send back the info about the server connection
1234                                                                         SZ_Clear(&net_message);
1235                                                                         // save space for the header, filled in later
1236                                                                         MSG_WriteLong(&net_message, 0);
1237                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1238                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
1239                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1240                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1241                                                                         SZ_Clear(&net_message);
1242                                                                         // now set up the client struct
1243                                                                         SV_ConnectClient(clientnum, conn);
1244                                                                         NetConn_Heartbeat(1);
1245                                                                 }
1246                                                                 else
1247                                                                 {
1248                                                                         //if (developer.integer)
1249                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
1250                                                                         // no room; try to let player know
1251                                                                         SZ_Clear(&net_message);
1252                                                                         // save space for the header, filled in later
1253                                                                         MSG_WriteLong(&net_message, 0);
1254                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1255                                                                         MSG_WriteString(&net_message, "Server is full.\n");
1256                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1257                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1258                                                                         SZ_Clear(&net_message);
1259                                                                 }
1260                                                         }
1261                                                 }
1262                                         }
1263                                         break;
1264 #if 0
1265                                 case CCREQ_SERVER_INFO:
1266                                         if (developer.integer)
1267                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
1268                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
1269                                         {
1270                                                 if (developer.integer)
1271                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
1272                                                 SZ_Clear(&net_message);
1273                                                 // save space for the header, filled in later
1274                                                 MSG_WriteLong(&net_message, 0);
1275                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1276                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1277                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1278                                                 MSG_WriteString(&net_message, hostname.string);
1279                                                 MSG_WriteString(&net_message, sv.name);
1280                                                 MSG_WriteByte(&net_message, net_activeconnections);
1281                                                 MSG_WriteByte(&net_message, svs.maxclients);
1282                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1283                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1284                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1285                                                 SZ_Clear(&net_message);
1286                                         }
1287                                         break;
1288                                 case CCREQ_PLAYER_INFO:
1289                                         if (developer.integer)
1290                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1291                                         if (sv.active)
1292                                         {
1293                                                 int playerNumber, activeNumber, clientNumber;
1294                                                 client_t *client;
1295
1296                                                 playerNumber = MSG_ReadByte();
1297                                                 activeNumber = -1;
1298                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1299                                                         if (client->active && ++activeNumber == playerNumber)
1300                                                                 break;
1301                                                 if (clientNumber != svs.maxclients)
1302                                                 {
1303                                                         SZ_Clear(&net_message);
1304                                                         // save space for the header, filled in later
1305                                                         MSG_WriteLong(&net_message, 0);
1306                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1307                                                         MSG_WriteByte(&net_message, playerNumber);
1308                                                         MSG_WriteString(&net_message, client->name);
1309                                                         MSG_WriteLong(&net_message, client->colors);
1310                                                         MSG_WriteLong(&net_message, (int)client->edict->v->frags);
1311                                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
1312                                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
1313                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1314                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1315                                                         SZ_Clear(&net_message);
1316                                                 }
1317                                         }
1318                                         break;
1319                                 case CCREQ_RULE_INFO:
1320                                         if (developer.integer)
1321                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1322                                         if (sv.active)
1323                                         {
1324                                                 char *prevCvarName;
1325                                                 cvar_t *var;
1326
1327                                                 // find the search start location
1328                                                 prevCvarName = MSG_ReadString();
1329                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1330
1331                                                 // send the response
1332                                                 SZ_Clear(&net_message);
1333                                                 // save space for the header, filled in later
1334                                                 MSG_WriteLong(&net_message, 0);
1335                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1336                                                 if (var)
1337                                                 {
1338                                                         MSG_WriteString(&net_message, var->name);
1339                                                         MSG_WriteString(&net_message, var->string);
1340                                                 }
1341                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1342                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1343                                                 SZ_Clear(&net_message);
1344                                         }
1345                                         break;
1346 #endif
1347                                 default:
1348                                         break;
1349                                 }
1350                                 // we may not have liked the packet, but it was a valid control
1351                                 // packet, so we're done processing this packet now
1352                                 return true;
1353                         }
1354                 }
1355 #endif
1356                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1357                 {
1358                         if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1359                         {
1360                                 sv_player = host_client->edict;
1361                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1362                                         SV_ReadClientMessage();
1363                                 return ret;
1364                         }
1365                 }
1366         }
1367         return 0;
1368 }
1369
1370 void NetConn_ServerFrame(void)
1371 {
1372         int i, length;
1373         lhnetaddress_t peeraddress;
1374         netconn_t *conn;
1375         NetConn_UpdateServerStuff();
1376         for (i = 0;i < sv_numsockets;i++)
1377                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1378                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1379         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1380         {
1381                 // never timeout loopback connections
1382                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
1383                 {
1384                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1385                         sv_player = host_client->edict;
1386                         SV_DropClient(false);
1387                 }
1388         }
1389         for (conn = netconn_list;conn;conn = conn->next)
1390                 NetConn_ReSendMessage(conn);
1391 }
1392
1393 void NetConn_QueryMasters(void)
1394 {
1395         int i;
1396         int masternum;
1397         lhnetaddress_t masteraddress;
1398         char request[256];
1399
1400         if (hostCacheCount >= HOSTCACHESIZE)
1401                 return;
1402
1403         for (i = 0;i < cl_numsockets;i++)
1404         {
1405                 if (cl_sockets[i])
1406                 {
1407 #if 0
1408                         // search LAN
1409 #if 1
1410                         UDP_Broadcast(UDP_controlSock, "\377\377\377\377getinfo", 11);
1411 #else
1412                         SZ_Clear(&net_message);
1413                         // save space for the header, filled in later
1414                         MSG_WriteLong(&net_message, 0);
1415                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1416                         MSG_WriteString(&net_message, "QUAKE");
1417                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1418                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1419                         UDP_Broadcast(UDP_controlSock, net_message.data, net_message.cursize);
1420                         SZ_Clear(&net_message);
1421 #endif
1422 #endif
1423
1424                         // build the getservers
1425                         snprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1426
1427                         // search internet
1428                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1429                         {
1430                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1431                                 {
1432                                         masterquerycount++;
1433                                         NetConn_WriteString(cl_sockets[i], request, &masteraddress);
1434                                 }
1435                         }
1436                 }
1437         }
1438         if (!masterquerycount)
1439         {
1440                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
1441                 M_Update_Return_Reason("No network");
1442         }
1443 }
1444
1445 void NetConn_Heartbeat(int priority)
1446 {
1447         lhnetaddress_t masteraddress;
1448         int masternum;
1449         lhnetsocket_t *mysocket;
1450
1451         // if it's a state change (client connected), limit next heartbeat to no
1452         // more than 30 sec in the future
1453         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1454                 nextheartbeattime = realtime + 30.0;
1455
1456         // limit heartbeatperiod to 30 to 270 second range,
1457         // lower limit is to avoid abusing master servers with excess traffic,
1458         // upper limit is to avoid timing out on the master server (which uses
1459         // 300 sec timeout)
1460         if (sv_heartbeatperiod.value < 30)
1461                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1462         if (sv_heartbeatperiod.value > 270)
1463                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1464
1465         // make advertising optional and don't advertise singleplayer games, and
1466         // only send a heartbeat as often as the admin wants
1467         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1468         {
1469                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1470                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1471                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1472                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
1473         }
1474 }
1475
1476 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1477 {
1478         int i, count = 0;
1479         qbyte sent[MAX_SCOREBOARD];
1480
1481         memset(sent, 0, sizeof(sent));
1482
1483         // simultaneously wait for the first CanSendMessage and send the message,
1484         // then wait for a second CanSendMessage (verifying it was received), or
1485         // the client drops and is no longer counted
1486         // the loop aborts when either it runs out of clients to send to, or a
1487         // timeout expires
1488         blocktime += Sys_DoubleTime();
1489         do
1490         {
1491                 count = 0;
1492                 NetConn_ClientFrame();
1493                 NetConn_ServerFrame();
1494                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1495                 {
1496                         if (host_client->netconnection)
1497                         {
1498                                 if (NetConn_CanSendMessage(host_client->netconnection))
1499                                 {
1500                                         if (!sent[i])
1501                                                 NetConn_SendReliableMessage(host_client->netconnection, data);
1502                                         sent[i] = true;
1503                                 }
1504                                 if (!NetConn_CanSendMessage(host_client->netconnection))
1505                                         count++;
1506                         }
1507                 }
1508         }
1509         while (count && Sys_DoubleTime() < blocktime);
1510         return count;
1511 }
1512
1513 static void Net_Heartbeat_f(void)
1514 {
1515         if (sv.active)
1516                 NetConn_Heartbeat(2);
1517         else
1518                 Con_Print("No server running, can not heartbeat to master server.\n");
1519 }
1520
1521 void PrintStats(netconn_t *conn)
1522 {
1523         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1524 }
1525
1526 void Net_Stats_f(void)
1527 {
1528         netconn_t *conn;
1529         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1530         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1531         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1532         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1533         Con_Printf("packetsSent                = %i\n", packetsSent);
1534         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1535         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1536         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1537         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1538         Con_Print("connections                =\n");
1539         for (conn = netconn_list;conn;conn = conn->next)
1540                 PrintStats(conn);
1541 }
1542
1543 void Net_Slist_f(void)
1544 {
1545         masterquerytime = realtime;
1546         masterquerycount = 0;
1547         masterreplycount = 0;
1548         serverquerycount = 0;
1549         serverreplycount = 0;
1550         hostCacheCount = 0;
1551         memset(&pingcache, 0, sizeof(pingcache));
1552         if (m_state != m_slist)
1553                 Con_Print("Sending requests to master servers\n");
1554         NetConn_QueryMasters();
1555         if (m_state != m_slist)
1556                 Con_Print("Listening for replies...\n");
1557 }
1558
1559 void NetConn_Init(void)
1560 {
1561         int i;
1562         lhnetaddress_t tempaddress;
1563         netconn_mempool = Mem_AllocPool("Networking", 0, NULL);
1564         Cmd_AddCommand("net_stats", Net_Stats_f);
1565         Cmd_AddCommand("net_slist", Net_Slist_f);
1566         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
1567         Cvar_RegisterVariable(&net_messagetimeout);
1568         Cvar_RegisterVariable(&net_messagerejointimeout);
1569         Cvar_RegisterVariable(&net_connecttimeout);
1570         Cvar_RegisterVariable(&cl_netlocalping);
1571         Cvar_RegisterVariable(&cl_netpacketloss);
1572         Cvar_RegisterVariable(&hostname);
1573         Cvar_RegisterVariable(&developer_networking);
1574         Cvar_RegisterVariable(&cl_netport);
1575         Cvar_RegisterVariable(&sv_netport);
1576         Cvar_RegisterVariable(&net_address);
1577         //Cvar_RegisterVariable(&net_address_ipv6);
1578         Cvar_RegisterVariable(&sv_public);
1579         Cvar_RegisterVariable(&sv_heartbeatperiod);
1580         for (i = 0;sv_masters[i].name;i++)
1581                 Cvar_RegisterVariable(&sv_masters[i]);
1582 // COMMANDLINEOPTION: Server: -ip <ipaddress> sets the ip address of this machine for purposes of networking (default 0.0.0.0 also known as INADDR_ANY), use only if you have multiple network adapters and need to choose one specifically.
1583         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
1584         {
1585                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
1586                 {
1587                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
1588                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
1589                 }
1590                 else
1591                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
1592         }
1593 // COMMANDLINEOPTION: Server: -port <portnumber> sets the port to use for a server (default 26000, the same port as QUAKE itself), useful if you host multiple servers on your machine
1594         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
1595         {
1596                 i = atoi(com_argv[i + 1]);
1597                 if (i >= 0 && i < 65536)
1598                 {
1599                         Con_Printf("-port option used, setting port cvar to %i\n", i);
1600                         Cvar_SetValueQuick(&sv_netport, i);
1601                 }
1602                 else
1603                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
1604         }
1605         cl_numsockets = 0;
1606         sv_numsockets = 0;
1607         memset(&pingcache, 0, sizeof(pingcache));
1608         SZ_Alloc(&net_message, NET_MAXMESSAGE, "net_message");
1609         LHNET_Init();
1610 }
1611
1612 void NetConn_Shutdown(void)
1613 {
1614         NetConn_CloseClientPorts();
1615         NetConn_CloseServerPorts();
1616         LHNET_Shutdown();
1617 }
1618