netconn.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3 Copyright (C) 2002 Mathieu Olivier
   4 Copyright (C) 2003 Forest Hale
   5
   6 This program is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public License
   8 as published by the Free Software Foundation; either version 2
   9 of the License, or (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14
  15 See the GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20
  21 */
  22
  23 #include "quakedef.h"
  24 #include "lhnet.h"
  25
  26 #define MASTER_PORT 27950
  27
  28 cvar_t sv_public = {0, "sv_public", "0"};
  29 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "180"};
  30
  31 static cvar_t sv_masters [] =
  32 {
  33         {CVAR_SAVE, "sv_master1", ""},
  34         {CVAR_SAVE, "sv_master2", ""},
  35         {CVAR_SAVE, "sv_master3", ""},
  36         {CVAR_SAVE, "sv_master4", ""},
  37         {0, "sv_masterextra1", "198.88.152.4"},
  38         {0, NULL, NULL}
  39 };
  40
  41 static double nextheartbeattime = 0;
  42
  43 sizebuf_t net_message;
  44
  45 cvar_t net_messagetimeout = {0, "net_messagetimeout","300"};
  46 cvar_t net_messagerejointimeout = {0, "net_messagerejointimeout","10"};
  47 cvar_t net_connecttimeout = {0, "net_connecttimeout","10"};
  48 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED"};
  49 cvar_t developer_networking = {0, "developer_networking", "0"};
  50
  51 cvar_t cl_fakelocalping_min = {0, "cl_fakelocalping_min","0"};
  52 cvar_t cl_fakelocalping_max = {0, "cl_fakelocalping_max","0"};
  53 static cvar_t cl_fakepacketloss_receive = {0, "cl_fakepacketloss_receive","0"};
  54 static cvar_t cl_fakepacketloss_send = {0, "cl_fakepacketloss_send","0"};
  55 static cvar_t sv_fakepacketloss_receive = {0, "sv_fakepacketloss_receive","0"};
  56 static cvar_t sv_fakepacketloss_send = {0, "sv_fakepacketloss_send","0"};
  57
  58
  59 /* statistic counters */
  60 static int packetsSent = 0;
  61 static int packetsReSent = 0;
  62 static int packetsReceived = 0;
  63 static int receivedDuplicateCount = 0;
  64 static int droppedDatagrams = 0;
  65
  66 static int unreliableMessagesSent = 0;
  67 static int unreliableMessagesReceived = 0;
  68 static int reliableMessagesSent = 0;
  69 static int reliableMessagesReceived = 0;
  70
  71 int hostCacheCount = 0;
  72 hostcache_t hostcache[HOSTCACHESIZE];
  73
  74 static qbyte sendbuffer[NET_MAXMESSAGE];
  75 static qbyte readbuffer[NET_MAXMESSAGE];
  76
  77 int cl_numsockets;
  78 lhnetsocket_t *cl_sockets[16];
  79 int sv_numsockets;
  80 lhnetsocket_t *sv_sockets[16];
  81
  82 netconn_t *netconn_list = NULL;
  83 mempool_t *netconn_mempool = NULL;
  84
  85 cvar_t cl_netport = {0, "cl_port", "0"};
  86 cvar_t cl_netaddress = {0, "cl_netaddress", "0.0.0.0"};
  87 cvar_t cl_netaddress_ipv6 = {0, "cl_netaddress_ipv6", "[0:0:0:0:0:0:0:0]:0"};
  88
  89 cvar_t sv_netport = {0, "port", "26000"};
  90 cvar_t sv_netaddress = {0, "sv_netaddress", "0.0.0.0"};
  91 cvar_t sv_netaddress_ipv6 = {0, "sv_netaddress_ipv6", "[0:0:0:0:0:0:0:0]:26000"};
  92
  93 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
  94 {
  95         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
  96         int i;
  97         if (cl_fakepacketloss_receive.integer)
  98                 for (i = 0;i < cl_numsockets;i++)
  99                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_fakepacketloss_receive.integer)
 100                                 return 0;
 101         if (sv_fakepacketloss_receive.integer)
 102                 for (i = 0;i < cl_numsockets;i++)
 103                         if (sv_sockets[i] == mysocket && (rand() % 100) < sv_fakepacketloss_receive.integer)
 104                                 return 0;
 105         if (developer_networking.integer && length != 0)
 106         {
 107                 char addressstring[128], addressstring2[128];
 108                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 109                 if (length > 0)
 110                 {
 111                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 112                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
 113                         Com_HexDumpToConsole(data, length);
 114                 }
 115                 else
 116                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
 117         }
 118         return length;
 119 }
 120
 121 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 122 {
 123         int ret;
 124         int i;
 125         if (cl_fakepacketloss_send.integer)
 126                 for (i = 0;i < cl_numsockets;i++)
 127                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_fakepacketloss_send.integer)
 128                                 return length;
 129         if (sv_fakepacketloss_send.integer)
 130                 for (i = 0;i < cl_numsockets;i++)
 131                         if (sv_sockets[i] == mysocket && (rand() % 100) < sv_fakepacketloss_send.integer)
 132                                 return length;
 133         ret = LHNET_Write(mysocket, data, length, peeraddress);
 134         if (developer_networking.integer)
 135         {
 136                 char addressstring[128], addressstring2[128];
 137                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 138                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 139                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 140                 Com_HexDumpToConsole(data, length);
 141         }
 142         return ret;
 143 }
 144
 145 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 146 {
 147         // note this does not include the trailing NULL because we add that in the parser
 148         return NetConn_Write(mysocket, string, strlen(string), peeraddress);
 149 }
 150
 151 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
 152 {
 153         unsigned int packetLen;
 154         unsigned int dataLen;
 155         unsigned int eom;
 156         unsigned int *header;
 157
 158 //#ifdef DEBUG
 159         if (data->cursize == 0)
 160                 Sys_Error("Datagram_SendMessage: zero length message\n");
 161
 162         if (data->cursize > NET_MAXMESSAGE)
 163                 Sys_Error("Datagram_SendMessage: message too big %u\n", data->cursize);
 164
 165         if (conn->canSend == false)
 166                 Sys_Error("SendMessage: called with canSend == false\n");
 167 //#endif
 168
 169         memcpy(conn->sendMessage, data->data, data->cursize);
 170         conn->sendMessageLength = data->cursize;
 171
 172         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 173         {
 174                 dataLen = conn->sendMessageLength;
 175                 eom = NETFLAG_EOM;
 176         }
 177         else
 178         {
 179                 dataLen = MAX_PACKETFRAGMENT;
 180                 eom = 0;
 181         }
 182
 183         packetLen = NET_HEADERSIZE + dataLen;
 184
 185         header = (void *)sendbuffer;
 186         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 187         header[1] = BigLong(conn->sendSequence);
 188         memcpy(sendbuffer + 8, conn->sendMessage, dataLen);
 189
 190         conn->sendSequence++;
 191         conn->canSend = false;
 192
 193         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 194                 return -1;
 195
 196         conn->lastSendTime = realtime;
 197         packetsSent++;
 198         reliableMessagesSent++;
 199         return 1;
 200 }
 201
 202 static void NetConn_SendMessageNext(netconn_t *conn)
 203 {
 204         unsigned int packetLen;
 205         unsigned int dataLen;
 206         unsigned int eom;
 207         unsigned int *header;
 208
 209         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
 210         {
 211                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 212                 {
 213                         dataLen = conn->sendMessageLength;
 214                         eom = NETFLAG_EOM;
 215                 }
 216                 else
 217                 {
 218                         dataLen = MAX_PACKETFRAGMENT;
 219                         eom = 0;
 220                 }
 221
 222                 packetLen = NET_HEADERSIZE + dataLen;
 223
 224                 header = (void *)sendbuffer;
 225                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 226                 header[1] = BigLong(conn->sendSequence);
 227                 memcpy(sendbuffer + 8, conn->sendMessage, dataLen);
 228
 229                 conn->sendSequence++;
 230                 conn->sendNext = false;
 231
 232                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 233                         return;
 234
 235                 conn->lastSendTime = realtime;
 236                 packetsSent++;
 237         }
 238 }
 239
 240 static void NetConn_ReSendMessage(netconn_t *conn)
 241 {
 242         unsigned int packetLen;
 243         unsigned int dataLen;
 244         unsigned int eom;
 245         unsigned int *header;
 246
 247         if (conn->sendMessageLength && !conn->canSend && (realtime - conn->lastSendTime) > 1.0)
 248         {
 249                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
 250                 {
 251                         dataLen = conn->sendMessageLength;
 252                         eom = NETFLAG_EOM;
 253                 }
 254                 else
 255                 {
 256                         dataLen = MAX_PACKETFRAGMENT;
 257                         eom = 0;
 258                 }
 259
 260                 packetLen = NET_HEADERSIZE + dataLen;
 261
 262                 header = (void *)sendbuffer;
 263                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 264                 header[1] = BigLong(conn->sendSequence - 1);
 265                 memcpy(sendbuffer + 8, conn->sendMessage, dataLen);
 266
 267                 conn->sendNext = false;
 268
 269                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 270                         return;
 271
 272                 conn->lastSendTime = realtime;
 273                 packetsReSent++;
 274         }
 275 }
 276
 277 qboolean NetConn_CanSendMessage(netconn_t *conn)
 278 {
 279         return conn->canSend;
 280 }
 281
 282 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
 283 {
 284         int packetLen;
 285         int *header;
 286
 287 #ifdef DEBUG
 288         if (data->cursize == 0)
 289                 Sys_Error("Datagram_SendUnreliableMessage: zero length message\n");
 290
 291         if (data->cursize > MAX_DATAGRAM)
 292                 Sys_Error("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
 293 #endif
 294
 295         packetLen = NET_HEADERSIZE + data->cursize;
 296
 297         header = (void *)sendbuffer;
 298         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
 299         header[1] = BigLong(conn->unreliableSendSequence);
 300         memcpy(sendbuffer + 8, data->data, data->cursize);
 301
 302         conn->unreliableSendSequence++;
 303
 304         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 305                 return -1;
 306
 307         packetsSent++;
 308         unreliableMessagesSent++;
 309         return 1;
 310 }
 311
 312 void NetConn_CloseClientPorts(void)
 313 {
 314         for (;cl_numsockets > 0;cl_numsockets--)
 315                 if (cl_sockets[cl_numsockets - 1])
 316                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 317 }
 318
 319 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
 320 {
 321         lhnetaddress_t address;
 322         lhnetsocket_t *s;
 323         char addressstring2[1024];
 324         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 325         {
 326                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 327                 {
 328                         cl_sockets[cl_numsockets++] = s;
 329                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 330                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
 331                 }
 332                 else
 333                 {
 334                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 335                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
 336                 }
 337         }
 338         else
 339                 Con_Printf("Client unable to parse address %s\n", addressstring);
 340 }
 341
 342 void NetConn_OpenClientPorts(void)
 343 {
 344         int port;
 345         NetConn_CloseClientPorts();
 346         port = bound(0, cl_netport.integer, 65535);
 347         if (cl_netport.integer != port)
 348                 Cvar_SetValueQuick(&cl_netport, port);
 349         Con_Printf("Client using port %i\n", port);
 350         NetConn_OpenClientPort("local", port);
 351         NetConn_OpenClientPort(cl_netaddress.string, port);
 352         NetConn_OpenClientPort(cl_netaddress_ipv6.string, port);
 353 }
 354
 355 void NetConn_CloseServerPorts(void)
 356 {
 357         for (;sv_numsockets > 0;sv_numsockets--)
 358                 if (sv_sockets[sv_numsockets - 1])
 359                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 360 }
 361
 362 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
 363 {
 364         lhnetaddress_t address;
 365         lhnetsocket_t *s;
 366         char addressstring2[1024];
 367         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
 368         {
 369                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
 370                 {
 371                         sv_sockets[sv_numsockets++] = s;
 372                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
 373                         Con_Printf("Server listening on address %s\n", addressstring2);
 374                 }
 375                 else
 376                 {
 377                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
 378                         Con_Printf("Server failed to open socket on address %s\n", addressstring2);
 379                 }
 380         }
 381         else
 382                 Con_Printf("Server unable to parse address %s\n", addressstring);
 383 }
 384
 385 void NetConn_OpenServerPorts(int opennetports)
 386 {
 387         int port;
 388         NetConn_CloseServerPorts();
 389         port = bound(0, sv_netport.integer, 65535);
 390         if (port == 0)
 391                 port = 26000;
 392         Con_Printf("Server using port %i\n", port);
 393         if (sv_netport.integer != port)
 394                 Cvar_SetValueQuick(&sv_netport, port);
 395         if (cls.state != ca_dedicated)
 396                 NetConn_OpenServerPort("local", port);
 397         if (opennetports)
 398         {
 399                 NetConn_OpenServerPort(sv_netaddress.string, port);
 400                 NetConn_OpenServerPort(sv_netaddress_ipv6.string, port);
 401         }
 402         if (sv_numsockets == 0)
 403                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!\n");
 404 }
 405
 406 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 407 {
 408         int i, a = LHNETADDRESS_GetAddressType(address);
 409         for (i = 0;i < cl_numsockets;i++)
 410                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 411                         return cl_sockets[i];
 412         return NULL;
 413 }
 414
 415 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 416 {
 417         int i, a = LHNETADDRESS_GetAddressType(address);
 418         for (i = 0;i < sv_numsockets;i++)
 419                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 420                         return sv_sockets[i];
 421         return NULL;
 422 }
 423
 424 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 425 {
 426         netconn_t *conn;
 427         conn = Mem_Alloc(netconn_mempool, sizeof(*conn));
 428         conn->mysocket = mysocket;
 429         conn->peeraddress = *peeraddress;
 430         conn->canSend = true;
 431         conn->connecttime = realtime;
 432         conn->lastMessageTime = realtime;
 433         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
 434         // reduce effectiveness of connection request floods
 435         conn->timeout = realtime + net_connecttimeout.value;
 436         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
 437         conn->next = netconn_list;
 438         netconn_list = conn;
 439         return conn;
 440 }
 441
 442 void NetConn_Close(netconn_t *conn)
 443 {
 444         netconn_t *c;
 445         // remove connection from list
 446         if (conn == netconn_list)
 447                 netconn_list = conn->next;
 448         else
 449         {
 450                 for (c = netconn_list;c;c = c->next)
 451                 {
 452                         if (c->next == conn)
 453                         {
 454                                 c->next = conn->next;
 455                                 break;
 456                         }
 457                 }
 458                 // not found in list, we'll avoid crashing here...
 459                 if (!c)
 460                         return;
 461         }
 462         // free connection
 463         Mem_Free(conn);
 464 }
 465
 466 static int clientport = -1;
 467 static int clientport2 = -1;
 468 static int hostport = -1;
 469 static void NetConn_UpdateServerStuff(void)
 470 {
 471         if (clientport2 != cl_netport.integer)
 472         {
 473                 clientport2 = cl_netport.integer;
 474                 if (cls.state == ca_connected)
 475                         Con_Printf("Changing \"cl_port\" will not take effect until you reconnect.\n");
 476         }
 477         if (cls.state != ca_dedicated)
 478         {
 479                 if (cls.state == ca_disconnected && clientport != cl_netport.integer)
 480                 {
 481                         clientport = cl_netport.integer;
 482                         NetConn_CloseClientPorts();
 483                 }
 484                 if (cl_numsockets == 0)
 485                         NetConn_OpenClientPorts();
 486         }
 487
 488         if (hostport != sv_netport.integer)
 489         {
 490                 hostport = sv_netport.integer;
 491                 if (sv.active)
 492                         Con_Printf("Changing \"port\" will not take effect until \"map\" command is executed.\n");
 493         }
 494 }
 495
 496 int NetConn_ReceivedMessage(netconn_t *conn, qbyte *data, int length)
 497 {
 498         unsigned int count;
 499         unsigned int flags;
 500         unsigned int sequence;
 501
 502         if (length >= 8)
 503         {
 504                 length = BigLong(((int *)data)[0]);
 505                 flags = length & ~NETFLAG_LENGTH_MASK;
 506                 length &= NETFLAG_LENGTH_MASK;
 507                 // control packets were already handled
 508                 if (!(flags & NETFLAG_CTL))
 509                 {
 510                         sequence = BigLong(((int *)data)[1]);
 511                         packetsReceived++;
 512                         data += 8;
 513                         length -= 8;
 514                         if (flags & NETFLAG_UNRELIABLE)
 515                         {
 516                                 if (sequence >= conn->unreliableReceiveSequence)
 517                                 {
 518                                         if (sequence > conn->unreliableReceiveSequence)
 519                                         {
 520                                                 count = sequence - conn->unreliableReceiveSequence;
 521                                                 droppedDatagrams += count;
 522                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
 523                                         }
 524                                         conn->unreliableReceiveSequence = sequence + 1;
 525                                         conn->lastMessageTime = realtime;
 526                                         conn->timeout = realtime + net_messagetimeout.value;
 527                                         unreliableMessagesReceived++;
 528                                         if (length > 0)
 529                                         {
 530                                                 SZ_Clear(&net_message);
 531                                                 SZ_Write(&net_message, data, length);
 532                                                 MSG_BeginReading();
 533                                                 return 2;
 534                                         }
 535                                 }
 536                                 else
 537                                         Con_DPrintf("Got a stale datagram\n");
 538                                 return 1;
 539                         }
 540                         else if (flags & NETFLAG_ACK)
 541                         {
 542                                 if (sequence == (conn->sendSequence - 1))
 543                                 {
 544                                         if (sequence == conn->ackSequence)
 545                                         {
 546                                                 conn->ackSequence++;
 547                                                 if (conn->ackSequence != conn->sendSequence)
 548                                                         Con_DPrintf("ack sequencing error\n");
 549                                                 conn->lastMessageTime = realtime;
 550                                                 conn->timeout = realtime + net_messagetimeout.value;
 551                                                 conn->sendMessageLength -= MAX_PACKETFRAGMENT;
 552                                                 if (conn->sendMessageLength > 0)
 553                                                 {
 554                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
 555                                                         conn->sendNext = true;
 556                                                         NetConn_SendMessageNext(conn);
 557                                                 }
 558                                                 else
 559                                                 {
 560                                                         conn->sendMessageLength = 0;
 561                                                         conn->canSend = true;
 562                                                 }
 563                                         }
 564                                         else
 565                                                 Con_DPrintf("Duplicate ACK received\n");
 566                                 }
 567                                 else
 568                                         Con_DPrintf("Stale ACK received\n");
 569                                 return 1;
 570                         }
 571                         else if (flags & NETFLAG_DATA)
 572                         {
 573                                 unsigned int temppacket[2];
 574                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
 575                                 temppacket[1] = BigLong(sequence);
 576                                 NetConn_Write(conn->mysocket, (qbyte *)temppacket, 8, &conn->peeraddress);
 577                                 if (sequence == conn->receiveSequence)
 578                                 {
 579                                         conn->lastMessageTime = realtime;
 580                                         conn->timeout = realtime + net_messagetimeout.value;
 581                                         conn->receiveSequence++;
 582                                         memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
 583                                         conn->receiveMessageLength += length;
 584                                         if (flags & NETFLAG_EOM)
 585                                         {
 586                                                 reliableMessagesReceived++;
 587                                                 length = conn->receiveMessageLength;
 588                                                 conn->receiveMessageLength = 0;
 589                                                 if (length > 0)
 590                                                 {
 591                                                         SZ_Clear(&net_message);
 592                                                         SZ_Write(&net_message, conn->receiveMessage, length);
 593                                                         MSG_BeginReading();
 594                                                         return 2;
 595                                                 }
 596                                         }
 597                                 }
 598                                 else
 599                                         receivedDuplicateCount++;
 600                                 return 1;
 601                         }
 602                 }
 603         }
 604         return 0;
 605 }
 606
 607 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 608 {
 609         cls.netcon = NetConn_Open(mysocket, peeraddress);
 610         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
 611         key_dest = key_game;
 612         m_state = m_none;
 613         cls.connect_trying = false;
 614         cls.demonum = -1;                       // not in the demo loop now
 615         cls.state = ca_connected;
 616         cls.signon = 0;                         // need all the signon messages before playing
 617         CL_ClearState();
 618         Host_Reconnect_f();
 619 }
 620
 621 int NetConn_IsLocalGame(void)
 622 {
 623         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
 624                 return true;
 625         return false;
 626 }
 627
 628 static struct
 629 {
 630         double senttime;
 631         lhnetaddress_t peeraddress;
 632 }
 633 pingcache[HOSTCACHESIZE];
 634
 635 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 636 {
 637         int ret, c, control;
 638         lhnetaddress_t svaddress;
 639         const char *s;
 640         char *string, addressstring2[128], cname[128], ipstring[32];
 641         char stringbuf[16384];
 642
 643         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 644         {
 645                 // received a command string - strip off the packaging and put it
 646                 // into our string buffer with NULL termination
 647                 data += 4;
 648                 length -= 4;
 649                 length = min(length, (int)sizeof(stringbuf) - 1);
 650                 memcpy(stringbuf, data, length);
 651                 stringbuf[length] = 0;
 652                 string = stringbuf;
 653
 654                 if (developer.integer)
 655                 {
 656                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 657                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
 658                         Com_HexDumpToConsole(data, length);
 659                 }
 660
 661                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
 662                 {
 663                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 664                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
 665                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\challenge\\%s", string + 10), peeraddress);
 666                         return true;
 667                 }
 668                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
 669                 {
 670                         NetConn_ConnectionEstablished(mysocket, peeraddress);
 671                         return true;
 672                 }
 673                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
 674                 {
 675                         cls.connect_trying = false;
 676                         string += 7;
 677                         length = max(length - 7, (int)sizeof(m_return_reason) - 1);
 678                         memcpy(m_return_reason, string, length);
 679                         m_return_reason[length] = 0;
 680                         Con_Printf("%s\n", m_return_reason);
 681                         return true;
 682                 }
 683                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
 684                 {
 685                         int i, j, c, n, users, maxusers;
 686                         char game[32], mod[32], map[32], name[128];
 687                         double pingtime;
 688                         hostcache_t temp;
 689                         string += 13;
 690                         // hostcache only uses text addresses
 691                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
 692                         // search the cache for this server
 693                         for (n = 0; n < hostCacheCount; n++)
 694                                 if (!strcmp(cname, hostcache[n].cname))
 695                                         break;
 696                         // add it or update it
 697                         if (n == hostCacheCount)
 698                         {
 699                                 // if cache is full replace highest ping server (the list is
 700                                 // kept sorted so this is always the last, and if this server
 701                                 // is good it will be sorted into an early part of the list)
 702                                 if (hostCacheCount >= HOSTCACHESIZE)
 703                                         n = hostCacheCount - 1;
 704                                 else
 705                                         hostCacheCount++;
 706                         }
 707                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strncpy(game, s, sizeof(game) - 1);else game[0] = 0;
 708                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strncpy(mod , s, sizeof(mod ) - 1);else mod[0] = 0;
 709                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strncpy(map , s, sizeof(map ) - 1);else map[0] = 0;
 710                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strncpy(name, s, sizeof(name) - 1);else name[0] = 0;
 711                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) c = atoi(s);else c = -1;
 712                         if ((s = SearchInfostring(string, "clients"      )) != NULL) users = atoi(s);else users = 0;
 713                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) maxusers = atoi(s);else maxusers = 0;
 714                         pingtime = 9999;
 715                         for (i = 0;i < HOSTCACHESIZE;i++)
 716                                 if (!LHNETADDRESS_Compare(peeraddress, &pingcache[i].peeraddress))
 717                                         pingtime = (int)(realtime - pingcache[i].senttime);
 718                         pingtime = bound(0, pingtime, 9999);
 719                         memset(&hostcache[n], 0, sizeof(hostcache[n]));
 720                         // store the data the engine cares about (address and ping)
 721                         strcpy(hostcache[n].cname, cname);
 722                         hostcache[n].ping = pingtime;
 723                         // build description strings for the things users care about
 724                         snprintf(hostcache[n].line1, sizeof(hostcache[n].line1), "%5d%c%3u/%3u %-65.65s", (int)pingtime, c != NET_PROTOCOL_VERSION ? '*' : ' ', users, maxusers, name);
 725                         snprintf(hostcache[n].line2, sizeof(hostcache[n].line2), "%-21.21s %-19.19s %-17.17s %-20.20s", cname, game, mod, map);
 726                         // if ping is especially high, display it as such
 727                         if (pingtime >= 300)
 728                         {
 729                                 // orange numbers (lower block)
 730                                 for (i = 0;i < 5;i++)
 731                                         if (hostcache[n].line1[i] != ' ')
 732                                                 hostcache[n].line1[i] += 128;
 733                         }
 734                         else if (pingtime >= 200)
 735                         {
 736                                 // yellow numbers (in upper block)
 737                                 for (i = 0;i < 5;i++)
 738                                         if (hostcache[n].line1[i] != ' ')
 739                                                 hostcache[n].line1[i] -= 30;
 740                         }
 741                         // if not in the slist menu we should print the server to console
 742                         if (m_state != m_slist)
 743                                 Con_Printf("%s\n%s\n", hostcache[n].line1, hostcache[n].line2);
 744                         // and finally, re-sort the list
 745                         for (i = 0;i < hostCacheCount;i++)
 746                         {
 747                                 for (j = i + 1;j < hostCacheCount;j++)
 748                                 {
 749                                         //if (strcmp(hostcache[j].name, hostcache[i].name) < 0)
 750                                         if (hostcache[i].ping > hostcache[j].ping)
 751                                         {
 752                                                 memcpy(&temp, &hostcache[j], sizeof(hostcache_t));
 753                                                 memcpy(&hostcache[j], &hostcache[i], sizeof(hostcache_t));
 754                                                 memcpy(&hostcache[i], &temp, sizeof(hostcache_t));
 755                                         }
 756                                 }
 757                         }
 758                         return true;
 759                 }
 760                 if (!strncmp(string, "getserversResponse\\", 19) && hostCacheCount < HOSTCACHESIZE)
 761                 {
 762                         int i, best;
 763                         double besttime;
 764                         // Extract the IP addresses
 765                         data += 18;
 766                         length -= 18;
 767                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
 768                         {
 769                                 sprintf(ipstring, "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
 770                                 if (developer.integer)
 771                                         Con_Printf("Requesting info from server %s\n", ipstring);
 772                                 LHNETADDRESS_FromString(&svaddress, ipstring, 0);
 773                                 NetConn_WriteString(mysocket, "\377\377\377\377getinfo", &svaddress);
 774                                 // replace oldest or matching entry in ping cache
 775                                 // we scan this later when getting a reply to see how long it took
 776                                 besttime = realtime;
 777                                 best = 0;
 778                                 for (i = 0;i < HOSTCACHESIZE;i++)
 779                                 {
 780                                         if (!LHNETADDRESS_Compare(&svaddress, &pingcache[i].peeraddress))
 781                                         {
 782                                                 best = i;
 783                                                 break;
 784                                         }
 785                                         if (besttime > pingcache[i].senttime)
 786                                         {
 787                                                 besttime = pingcache[i].senttime;
 788                                                 best = i;
 789                                                 // if ping cache isn't full yet we can skip out early
 790                                                 if (!besttime)
 791                                                         break;
 792                                         }
 793                                 }
 794                                 pingcache[best].peeraddress = svaddress;
 795                                 pingcache[best].senttime = realtime;
 796                                 // move on to next address in packet
 797                                 data += 7;
 798                                 length -= 7;
 799                         }
 800                         return true;
 801                 }
 802                 /*
 803                 if (!strncmp(string, "ping", 4))
 804                 {
 805                         if (developer.integer)
 806                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
 807                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
 808                         return true;
 809                 }
 810                 if (!strncmp(string, "ack", 3))
 811                         return true;
 812                 */
 813                 // we may not have liked the packet, but it was a command packet, so
 814                 // we're done processing this packet now
 815                 return true;
 816         }
 817         // netquake control packets, supported for compatibility only
 818         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
 819         {
 820                 c = data[4];
 821                 data += 5;
 822                 length -= 5;
 823                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 824                 switch (c)
 825                 {
 826                 case CCREP_ACCEPT:
 827                         if (developer.integer)
 828                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
 829                         if (cls.connect_trying)
 830                         {
 831                                 lhnetaddress_t clientportaddress;
 832                                 clientportaddress = *peeraddress;
 833                                 if (length >= 4)
 834                                 {
 835                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
 836                                         data += 4;
 837                                         length -= 4;
 838                                         LHNETADDRESS_SetPort(&clientportaddress, port);
 839                                 }
 840                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress);
 841                         }
 842                         break;
 843                 case CCREP_REJECT:
 844                         if (developer.integer)
 845                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
 846                         Con_Printf("%s\n", data);
 847                         strncpy(m_return_reason, data, sizeof(m_return_reason) - 1);
 848                         break;
 849 #if 0
 850                 case CCREP_SERVER_INFO:
 851                         if (developer.integer)
 852                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
 853                         if (cls.state != ca_dedicated)
 854                         {
 855                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
 856                                 // string we just ignore it and keep the real address
 857                                 MSG_ReadString();
 858                                 // hostcache only uses text addresses
 859                                 cname = UDP_AddrToString(readaddr);
 860                                 // search the cache for this server
 861                                 for (n = 0; n < hostCacheCount; n++)
 862                                         if (!strcmp(cname, hostcache[n].cname))
 863                                                 break;
 864                                 // add it
 865                                 if (n == hostCacheCount && hostCacheCount < HOSTCACHESIZE)
 866                                 {
 867                                         hostCacheCount++;
 868                                         memset(&hostcache[n], 0, sizeof(hostcache[n]));
 869                                         strcpy(hostcache[n].name, MSG_ReadString());
 870                                         strcpy(hostcache[n].map, MSG_ReadString());
 871                                         hostcache[n].users = MSG_ReadByte();
 872                                         hostcache[n].maxusers = MSG_ReadByte();
 873                                         c = MSG_ReadByte();
 874                                         if (c != NET_PROTOCOL_VERSION)
 875                                         {
 876                                                 strncpy(hostcache[n].cname, hostcache[n].name, sizeof(hostcache[n].cname) - 1);
 877                                                 hostcache[n].cname[sizeof(hostcache[n].cname) - 1] = 0;
 878                                                 strcpy(hostcache[n].name, "*");
 879                                                 strncat(hostcache[n].name, hostcache[n].cname, sizeof(hostcache[n].name) - 1);
 880                                                 hostcache[n].name[sizeof(hostcache[n].name) - 1] = 0;
 881                                         }
 882                                         strcpy(hostcache[n].cname, cname);
 883                                 }
 884                         }
 885                         break;
 886                 case CCREP_PLAYER_INFO:
 887                         // we got a CCREP_PLAYER_INFO??
 888                         //if (developer.integer)
 889                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
 890                         break;
 891                 case CCREP_RULE_INFO:
 892                         // we got a CCREP_RULE_INFO??
 893                         //if (developer.integer)
 894                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
 895                         break;
 896 #endif
 897                 default:
 898                         break;
 899                 }
 900                 // we may not have liked the packet, but it was a valid control
 901                 // packet, so we're done processing this packet now
 902                 return true;
 903         }
 904         ret = 0;
 905         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)
 906                 CL_ParseServerMessage();
 907         return ret;
 908 }
 909
 910 void NetConn_ClientFrame(void)
 911 {
 912         int i, length;
 913         lhnetaddress_t peeraddress;
 914         netconn_t *conn;
 915         NetConn_UpdateServerStuff();
 916         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
 917         {
 918                 if (cls.connect_remainingtries == 0)
 919                 {
 920                         cls.connect_trying = false;
 921                         Con_Printf("Connect failed\n");
 922                         return;
 923                 }
 924                 if (cls.connect_nextsendtime)
 925                         Con_Printf("Still trying...\n");
 926                 else
 927                         Con_Printf("Trying...\n");
 928                 cls.connect_nextsendtime = realtime + 1;
 929                 cls.connect_remainingtries--;
 930                 // try challenge first (newer server)
 931                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
 932                 // then try netquake as a fallback (old server, or netquake)
 933                 SZ_Clear(&net_message);
 934                 // save space for the header, filled in later
 935                 MSG_WriteLong(&net_message, 0);
 936                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
 937                 MSG_WriteString(&net_message, "QUAKE");
 938                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
 939                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 940                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
 941                 SZ_Clear(&net_message);
 942         }
 943         for (i = 0;i < cl_numsockets;i++)
 944                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
 945                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
 946         if (cls.netcon && realtime > cls.netcon->timeout)
 947         {
 948                 Con_Printf("Connection timed out\n");
 949                 CL_Disconnect();
 950         }
 951         for (conn = netconn_list;conn;conn = conn->next)
 952                 NetConn_ReSendMessage(conn);
 953 }
 954
 955 #define MAX_CHALLENGES 128
 956 struct
 957 {
 958         lhnetaddress_t address;
 959         double time;
 960         char string[12];
 961 }
 962 challenge[MAX_CHALLENGES];
 963
 964 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
 965 {
 966         int i;
 967         char c;
 968         for (i = 0;i < bufferlength - 1;i++)
 969         {
 970                 do
 971                 {
 972                         c = rand () % (127 - 33) + 33;
 973                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
 974                 buffer[i] = c;
 975         }
 976         buffer[i] = 0;
 977 }
 978
 979 extern void SV_ConnectClient(int clientnum, netconn_t *netconnection);
 980 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 981 {
 982         int i, n, ret, clientnum, responselength, best;
 983         double besttime;
 984         client_t *client;
 985         netconn_t *conn;
 986         char *s, *string, response[512], addressstring2[128], stringbuf[16384];
 987
 988         if (sv.active)
 989         {
 990                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 991                 {
 992                         // received a command string - strip off the packaging and put it
 993                         // into our string buffer with NULL termination
 994                         data += 4;
 995                         length -= 4;
 996                         length = min(length, (int)sizeof(stringbuf) - 1);
 997                         memcpy(stringbuf, data, length);
 998                         stringbuf[length] = 0;
 999                         string = stringbuf;
1000
1001                         if (developer.integer)
1002                         {
1003                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1004                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1005                                 Com_HexDumpToConsole(data, length);
1006                         }
1007
1008                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
1009                         {
1010                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1011                                 {
1012                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1013                                                 break;
1014                                         if (besttime > challenge[i].time)
1015                                                 besttime = challenge[best = i].time;
1016                                 }
1017                                 // if we did not find an exact match, choose the oldest and
1018                                 // update address and string
1019                                 if (i == MAX_CHALLENGES)
1020                                 {
1021                                         i = best;
1022                                         challenge[i].address = *peeraddress;
1023                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1024                                 }
1025                                 challenge[i].time = realtime;
1026                                 // send the challenge
1027                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1028                                 return true;
1029                         }
1030                         if (length > 8 && !memcmp(string, "connect\\", 8))
1031                         {
1032                                 string += 7;
1033                                 length -= 7;
1034                                 if ((s = SearchInfostring(string, "challenge")))
1035                                 {
1036                                         // validate the challenge
1037                                         for (i = 0;i < MAX_CHALLENGES;i++)
1038                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1039                                                         break;
1040                                         if (i < MAX_CHALLENGES)
1041                                         {
1042                                                 // check engine protocol
1043                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1044                                                 {
1045                                                         if (developer.integer)
1046                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1047                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1048                                                 }
1049                                                 else
1050                                                 {
1051                                                         // see if this is a duplicate connection request
1052                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1053                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1054                                                                         break;
1055                                                         if (clientnum < svs.maxclients)
1056                                                         {
1057                                                                 // duplicate connection request
1058                                                                 if (realtime - client->netconnection->connecttime < 2.0)
1059                                                                 {
1060                                                                         // client is still trying to connect,
1061                                                                         // so we send a duplicate reply
1062                                                                         if (developer.integer)
1063                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1064                                                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1065                                                                 }
1066                                                                 // only kick if old connection seems dead
1067                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1068                                                                 {
1069                                                                         // kick off connection and await retry
1070                                                                         client->deadsocket = true;
1071                                                                 }
1072                                                         }
1073                                                         else
1074                                                         {
1075                                                                 // this is a new client, find a slot
1076                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1077                                                                         if (!client->active)
1078                                                                                 break;
1079                                                                 if (clientnum < svs.maxclients)
1080                                                                 {
1081                                                                         // prepare the client struct
1082                                                                         if ((client->entitydatabase4 = EntityFrame4_AllocDatabase(sv_clients_mempool)))
1083                                                                         {
1084                                                                                 if ((conn = NetConn_Open(mysocket, peeraddress)))
1085                                                                                 {
1086                                                                                         // allocated connection
1087                                                                                         LHNETADDRESS_ToString(peeraddress, conn->address, sizeof(conn->address), true);
1088                                                                                         if (developer.integer)
1089                                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1090                                                                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1091                                                                                         // now set up the client
1092                                                                                         SV_ConnectClient(clientnum, conn);
1093                                                                                         NetConn_Heartbeat(1);
1094                                                                                 }
1095                                                                                 else
1096                                                                                         EntityFrame4_FreeDatabase(client->entitydatabase4);
1097                                                                         }
1098                                                                 }
1099                                                                 else
1100                                                                 {
1101                                                                         // server is full
1102                                                                         if (developer.integer)
1103                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1104                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1105                                                                 }
1106                                                         }
1107                                                 }
1108                                         }
1109                                 }
1110                                 return true;
1111                         }
1112                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1113                         {
1114                                 const char *challenge = NULL;
1115                                 // If there was a challenge in the getinfo message
1116                                 if (length > 8 && string[7] == ' ')
1117                                         challenge = string + 8;
1118                                 for (i = 0, n = 0;i < svs.maxclients;i++)
1119                                         if (svs.clients[i].active)
1120                                                 n++;
1121                                 responselength = snprintf(response, sizeof(response), "\377\377\377\377infoResponse\x0A"
1122                                                         "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
1123                                                         "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d%s%s",
1124                                                         gamename, com_modname, svs.maxclients, n,
1125                                                         sv.name, hostname.string, NET_PROTOCOL_VERSION, challenge ? "\\challenge\\" : "", challenge ? challenge : "");
1126                                 // does it fit in the buffer?
1127                                 if (responselength < (int)sizeof(response))
1128                                 {
1129                                         if (developer.integer)
1130                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1131                                         NetConn_WriteString(mysocket, response, peeraddress);
1132                                 }
1133                                 return true;
1134                         }
1135                         /*
1136                         if (!strncmp(string, "ping", 4))
1137                         {
1138                                 if (developer.integer)
1139                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1140                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1141                                 return true;
1142                         }
1143                         if (!strncmp(string, "ack", 3))
1144                                 return true;
1145                         */
1146                         // we may not have liked the packet, but it was a command packet, so
1147                         // we're done processing this packet now
1148                         return true;
1149                 }
1150                 // LordHavoc: disabled netquake control packet support in server
1151 #if 0
1152                 {
1153                         int c, control;
1154                         // netquake control packets, supported for compatibility only
1155                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1156                         {
1157                                 c = data[4];
1158                                 data += 5;
1159                                 length -= 5;
1160                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1161                                 switch (c)
1162                                 {
1163                                 case CCREQ_CONNECT:
1164                                         //if (developer.integer)
1165                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1166                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
1167                                         {
1168                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1169                                                 {
1170                                                         if (developer.integer)
1171                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1172                                                         SZ_Clear(&net_message);
1173                                                         // save space for the header, filled in later
1174                                                         MSG_WriteLong(&net_message, 0);
1175                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1176                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
1177                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1178                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1179                                                         SZ_Clear(&net_message);
1180                                                 }
1181                                                 else
1182                                                 {
1183                                                         // see if this is a duplicate connection request
1184                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1185                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1186                                                                         break;
1187                                                         if (clientnum < svs.maxclients)
1188                                                         {
1189                                                                 // duplicate connection request
1190                                                                 if (realtime - client->netconnection->connecttime < 2.0)
1191                                                                 {
1192                                                                         // client is still trying to connect,
1193                                                                         // so we send a duplicate reply
1194                                                                         if (developer.integer)
1195                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1196                                                                         SZ_Clear(&net_message);
1197                                                                         // save space for the header, filled in later
1198                                                                         MSG_WriteLong(&net_message, 0);
1199                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1200                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1201                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1202                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1203                                                                         SZ_Clear(&net_message);
1204                                                                 }
1205                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1206                                                                 {
1207                                                                         // the old client hasn't sent us anything
1208                                                                         // in quite a while, so kick off and let
1209                                                                         // the retry take care of it...
1210                                                                         client->deadsocket = true;
1211                                                                 }
1212                                                         }
1213                                                         else
1214                                                         {
1215                                                                 // this is a new client, find a slot
1216                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1217                                                                         if (!client->active)
1218                                                                                 break;
1219                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
1220                                                                 {
1221                                                                         // connect to the client
1222                                                                         // everything is allocated, just fill in the details
1223                                                                         strcpy(conn->address, addressstring2);
1224                                                                         if (developer.integer)
1225                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
1226                                                                         // send back the info about the server connection
1227                                                                         SZ_Clear(&net_message);
1228                                                                         // save space for the header, filled in later
1229                                                                         MSG_WriteLong(&net_message, 0);
1230                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1231                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
1232                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1233                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1234                                                                         SZ_Clear(&net_message);
1235                                                                         // now set up the client struct
1236                                                                         SV_ConnectClient(clientnum, conn);
1237                                                                         NetConn_Heartbeat(1);
1238                                                                 }
1239                                                                 else
1240                                                                 {
1241                                                                         //if (developer.integer)
1242                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
1243                                                                         // no room; try to let player know
1244                                                                         SZ_Clear(&net_message);
1245                                                                         // save space for the header, filled in later
1246                                                                         MSG_WriteLong(&net_message, 0);
1247                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1248                                                                         MSG_WriteString(&net_message, "Server is full.\n");
1249                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1250                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1251                                                                         SZ_Clear(&net_message);
1252                                                                 }
1253                                                         }
1254                                                 }
1255                                         }
1256                                         break;
1257 #if 0
1258                                 case CCREQ_SERVER_INFO:
1259                                         if (developer.integer)
1260                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
1261                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
1262                                         {
1263                                                 if (developer.integer)
1264                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
1265                                                 SZ_Clear(&net_message);
1266                                                 // save space for the header, filled in later
1267                                                 MSG_WriteLong(&net_message, 0);
1268                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1269                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1270                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1271                                                 MSG_WriteString(&net_message, hostname.string);
1272                                                 MSG_WriteString(&net_message, sv.name);
1273                                                 MSG_WriteByte(&net_message, net_activeconnections);
1274                                                 MSG_WriteByte(&net_message, svs.maxclients);
1275                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1276                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1277                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1278                                                 SZ_Clear(&net_message);
1279                                         }
1280                                         break;
1281                                 case CCREQ_PLAYER_INFO:
1282                                         if (developer.integer)
1283                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1284                                         if (sv.active)
1285                                         {
1286                                                 int playerNumber, activeNumber, clientNumber;
1287                                                 client_t *client;
1288
1289                                                 playerNumber = MSG_ReadByte();
1290                                                 activeNumber = -1;
1291                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1292                                                         if (client->active && ++activeNumber == playerNumber)
1293                                                                 break;
1294                                                 if (clientNumber != svs.maxclients)
1295                                                 {
1296                                                         SZ_Clear(&net_message);
1297                                                         // save space for the header, filled in later
1298                                                         MSG_WriteLong(&net_message, 0);
1299                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1300                                                         MSG_WriteByte(&net_message, playerNumber);
1301                                                         MSG_WriteString(&net_message, client->name);
1302                                                         MSG_WriteLong(&net_message, client->colors);
1303                                                         MSG_WriteLong(&net_message, (int)client->edict->v->frags);
1304                                                         MSG_WriteLong(&net_message, (int)(realtime - client->netconnection->connecttime));
1305                                                         MSG_WriteString(&net_message, client->netconnection->address);
1306                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1307                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1308                                                         SZ_Clear(&net_message);
1309                                                 }
1310                                         }
1311                                         break;
1312                                 case CCREQ_RULE_INFO:
1313                                         if (developer.integer)
1314                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1315                                         if (sv.active)
1316                                         {
1317                                                 char *prevCvarName;
1318                                                 cvar_t *var;
1319
1320                                                 // find the search start location
1321                                                 prevCvarName = MSG_ReadString();
1322                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1323
1324                                                 // send the response
1325                                                 SZ_Clear(&net_message);
1326                                                 // save space for the header, filled in later
1327                                                 MSG_WriteLong(&net_message, 0);
1328                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1329                                                 if (var)
1330                                                 {
1331                                                         MSG_WriteString(&net_message, var->name);
1332                                                         MSG_WriteString(&net_message, var->string);
1333                                                 }
1334                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1335                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1336                                                 SZ_Clear(&net_message);
1337                                         }
1338                                         break;
1339 #endif
1340                                 default:
1341                                         break;
1342                                 }
1343                                 // we may not have liked the packet, but it was a valid control
1344                                 // packet, so we're done processing this packet now
1345                                 return true;
1346                         }
1347                 }
1348 #endif
1349                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1350                 {
1351                         if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1352                         {
1353                                 sv_player = host_client->edict;
1354                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1355                                         SV_ReadClientMessage();
1356                                 return ret;
1357                         }
1358                 }
1359         }
1360         return 0;
1361 }
1362
1363 void NetConn_ServerFrame(void)
1364 {
1365         int i, length;
1366         lhnetaddress_t peeraddress;
1367         netconn_t *conn;
1368         NetConn_UpdateServerStuff();
1369         for (i = 0;i < sv_numsockets;i++)
1370                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1371                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1372         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1373         {
1374                 if (host_client->netconnection && realtime > host_client->netconnection->timeout)
1375                 {
1376                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1377                         sv_player = host_client->edict;
1378                         SV_DropClient(false);
1379                 }
1380         }
1381         for (conn = netconn_list;conn;conn = conn->next)
1382                 NetConn_ReSendMessage(conn);
1383 }
1384
1385 void NetConn_QueryMasters(void)
1386 {
1387         int i;
1388         int masternum;
1389         lhnetaddress_t masteraddress;
1390         char request[256];
1391
1392         if (hostCacheCount >= HOSTCACHESIZE)
1393                 return;
1394
1395         for (i = 0;i < cl_numsockets;i++)
1396         {
1397                 if (cl_sockets[i])
1398                 {
1399 #if 0
1400                         // search LAN
1401 #if 1
1402                         UDP_Broadcast(UDP_controlSock, "\377\377\377\377getinfo", 11);
1403 #else
1404                         SZ_Clear(&net_message);
1405                         // save space for the header, filled in later
1406                         MSG_WriteLong(&net_message, 0);
1407                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1408                         MSG_WriteString(&net_message, "QUAKE");
1409                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1410                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1411                         UDP_Broadcast(UDP_controlSock, net_message.data, net_message.cursize);
1412                         SZ_Clear(&net_message);
1413 #endif
1414 #endif
1415
1416                         // build the getservers
1417                         snprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1418
1419                         // search internet
1420                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1421                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1422                                         NetConn_WriteString(cl_sockets[i], request, &masteraddress);
1423                 }
1424         }
1425 }
1426
1427 void NetConn_Heartbeat(int priority)
1428 {
1429         lhnetaddress_t masteraddress;
1430         int masternum;
1431         lhnetsocket_t *mysocket;
1432
1433         // if it's a state change (client connected), limit next heartbeat to no
1434         // more than 30 sec in the future
1435         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1436                 nextheartbeattime = realtime + 30.0;
1437
1438         // limit heartbeatperiod to 30 to 270 second range,
1439         // lower limit is to avoid abusing master servers with excess traffic,
1440         // upper limit is to avoid timing out on the master server (which uses
1441         // 300 sec timeout)
1442         if (sv_heartbeatperiod.value < 30)
1443                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1444         if (sv_heartbeatperiod.value > 270)
1445                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1446
1447         // make advertising optional and don't advertise singleplayer games, and
1448         // only send a heartbeat as often as the admin wants
1449         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1450         {
1451                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1452                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1453                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1454                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
1455         }
1456 }
1457
1458 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1459 {
1460         int i, count = 0;
1461         qbyte sent[MAX_SCOREBOARD];
1462
1463         memset(sent, 0, sizeof(sent));
1464
1465         // simultaneously wait for the first CanSendMessage and send the message,
1466         // then wait for a second CanSendMessage (verifying it was received), or
1467         // the client drops and is no longer counted
1468         // the loop aborts when either it runs out of clients to send to, or a
1469         // timeout expires
1470         blocktime += Sys_DoubleTime();
1471         do
1472         {
1473                 count = 0;
1474                 NetConn_ClientFrame();
1475                 NetConn_ServerFrame();
1476                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1477                 {
1478                         if (host_client->netconnection)
1479                         {
1480                                 if (NetConn_CanSendMessage(host_client->netconnection))
1481                                 {
1482                                         if (!sent[i])
1483                                                 NetConn_SendReliableMessage(host_client->netconnection, data);
1484                                         sent[i] = true;
1485                                 }
1486                                 if (!NetConn_CanSendMessage(host_client->netconnection))
1487                                         count++;
1488                         }
1489                 }
1490         }
1491         while (count && Sys_DoubleTime() < blocktime);
1492         return count;
1493 }
1494
1495 static void Net_Heartbeat_f(void)
1496 {
1497         NetConn_Heartbeat(2);
1498 }
1499
1500 void PrintStats(netconn_t *conn)
1501 {
1502         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1503 }
1504
1505 void Net_Stats_f(void)
1506 {
1507         netconn_t *conn;
1508         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1509         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1510         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1511         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1512         Con_Printf("packetsSent                = %i\n", packetsSent);
1513         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1514         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1515         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1516         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1517         Con_Printf("connections                =\n");
1518         for (conn = netconn_list;conn;conn = conn->next)
1519                 PrintStats(conn);
1520 }
1521
1522 void Net_Slist_f(void)
1523 {
1524         hostCacheCount = 0;
1525         memset(&pingcache, 0, sizeof(pingcache));
1526         if (m_state != m_slist)
1527                 Con_Printf("Sending requests to master servers\n");
1528         NetConn_QueryMasters();
1529         if (m_state != m_slist)
1530                 Con_Printf("Listening for replies...\n");
1531 }
1532
1533 void NetConn_Init(void)
1534 {
1535         int i;
1536         lhnetaddress_t tempaddress;
1537         netconn_mempool = Mem_AllocPool("Networking");
1538         Cmd_AddCommand("net_stats", Net_Stats_f);
1539         Cmd_AddCommand("net_slist", Net_Slist_f);
1540         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
1541         Cvar_RegisterVariable(&net_messagetimeout);
1542         Cvar_RegisterVariable(&net_messagerejointimeout);
1543         Cvar_RegisterVariable(&net_connecttimeout);
1544         Cvar_RegisterVariable(&cl_fakelocalping_min);
1545         Cvar_RegisterVariable(&cl_fakelocalping_max);
1546         Cvar_RegisterVariable(&cl_fakepacketloss_receive);
1547         Cvar_RegisterVariable(&cl_fakepacketloss_send);
1548         Cvar_RegisterVariable(&sv_fakepacketloss_receive);
1549         Cvar_RegisterVariable(&sv_fakepacketloss_send);
1550         Cvar_RegisterVariable(&hostname);
1551         Cvar_RegisterVariable(&developer_networking);
1552         Cvar_RegisterVariable(&cl_netport);
1553         Cvar_RegisterVariable(&cl_netaddress);
1554         Cvar_RegisterVariable(&cl_netaddress_ipv6);
1555         Cvar_RegisterVariable(&sv_netport);
1556         Cvar_RegisterVariable(&sv_netaddress);
1557         Cvar_RegisterVariable(&sv_netaddress_ipv6);
1558         Cvar_RegisterVariable(&sv_public);
1559         Cvar_RegisterVariable(&sv_heartbeatperiod);
1560         for (i = 0;sv_masters[i].name;i++)
1561                 Cvar_RegisterVariable(&sv_masters[i]);
1562         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
1563         {
1564                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
1565                 {
1566                         Con_Printf("-ip option used, setting cl_netaddress and sv_netaddress to address \"%s\"\n");
1567                         Cvar_SetQuick(&cl_netaddress, com_argv[i + 1]);
1568                         Cvar_SetQuick(&sv_netaddress, com_argv[i + 1]);
1569                 }
1570                 else
1571                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
1572         }
1573         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
1574         {
1575                 i = atoi(com_argv[i + 1]);
1576                 if (i >= 0 && i < 65536)
1577                 {
1578                         Con_Printf("-port option used, setting port cvar to %i\n", i);
1579                         Cvar_SetValueQuick(&sv_netport, i);
1580                 }
1581                 else
1582                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
1583         }
1584         cl_numsockets = 0;
1585         sv_numsockets = 0;
1586         memset(&pingcache, 0, sizeof(pingcache));
1587         SZ_Alloc(&net_message, NET_MAXMESSAGE, "net_message");
1588         LHNET_Init();
1589 }
1590
1591 void NetConn_Shutdown(void)
1592 {
1593         NetConn_CloseClientPorts();
1594         NetConn_CloseServerPorts();
1595         LHNET_Shutdown();
1596 }
1597