netconn.c

   1 /*
   2 Copyright (C) 1996-1997 Id Software, Inc.
   3 Copyright (C) 2002 Mathieu Olivier
   4 Copyright (C) 2003 Forest Hale
   5
   6 This program is free software; you can redistribute it and/or
   7 modify it under the terms of the GNU General Public License
   8 as published by the Free Software Foundation; either version 2
   9 of the License, or (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14
  15 See the GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  20
  21 */
  22
  23 #include "quakedef.h"
  24 #include "lhnet.h"
  25
  26 #define MASTER_PORT 27950
  27
  28 cvar_t sv_public = {0, "sv_public", "0"};
  29 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "180"};
  30
  31 static cvar_t sv_masters [] =
  32 {
  33         {CVAR_SAVE, "sv_master1", ""},
  34         {CVAR_SAVE, "sv_master2", ""},
  35         {CVAR_SAVE, "sv_master3", ""},
  36         {CVAR_SAVE, "sv_master4", ""},
  37         {0, "sv_masterextra1", "198.88.152.4"},
  38         {0, "sv_masterextra2", "68.102.242.12"},
  39         {0, NULL, NULL}
  40 };
  41
  42 static double nextheartbeattime = 0;
  43
  44 sizebuf_t net_message;
  45
  46 cvar_t net_messagetimeout = {0, "net_messagetimeout","300"};
  47 cvar_t net_messagerejointimeout = {0, "net_messagerejointimeout","10"};
  48 cvar_t net_connecttimeout = {0, "net_connecttimeout","10"};
  49 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED"};
  50 cvar_t developer_networking = {0, "developer_networking", "0"};
  51
  52 /* statistic counters */
  53 static int packetsSent = 0;
  54 static int packetsReSent = 0;
  55 static int packetsReceived = 0;
  56 static int receivedDuplicateCount = 0;
  57 static int droppedDatagrams = 0;
  58
  59 static int unreliableMessagesSent = 0;
  60 static int unreliableMessagesReceived = 0;
  61 static int reliableMessagesSent = 0;
  62 static int reliableMessagesReceived = 0;
  63
  64 int hostCacheCount = 0;
  65 hostcache_t hostcache[HOSTCACHESIZE];
  66
  67 static qbyte sendbuffer[NET_MAXMESSAGE];
  68 static qbyte readbuffer[NET_MAXMESSAGE];
  69
  70 int cl_numsockets;
  71 lhnetsocket_t *cl_sockets[16];
  72 int sv_numsockets;
  73 lhnetsocket_t *sv_sockets[16];
  74
  75 netconn_t *netconn_list = NULL;
  76 mempool_t *netconn_mempool = NULL;
  77
  78 cvar_t cl_netport = {0, "cl_port", "0"};
  79 cvar_t cl_netaddress = {0, "cl_netaddress", "0.0.0.0"};
  80 cvar_t cl_netaddress_ipv6 = {0, "cl_netaddress_ipv6", "[0:0:0:0:0:0:0:0]:0"};
  81
  82 cvar_t sv_netport = {0, "port", "26000"};
  83 cvar_t sv_netaddress = {0, "sv_netaddress", "0.0.0.0"};
  84 cvar_t sv_netaddress_ipv6 = {0, "sv_netaddress_ipv6", "[0:0:0:0:0:0:0:0]:26000"};
  85
  86 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
  87 {
  88         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
  89         if (developer_networking.integer && length != 0)
  90         {
  91                 char addressstring[128], addressstring2[128];
  92                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
  93                 if (length > 0)
  94                 {
  95                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
  96                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
  97                         Com_HexDumpToConsole(data, length);
  98                 }
  99                 else
 100                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
 101         }
 102         return length;
 103 }
 104
 105 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
 106 {
 107         int ret = LHNET_Write(mysocket, data, length, peeraddress);
 108         if (developer_networking.integer)
 109         {
 110                 char addressstring[128], addressstring2[128];
 111                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
 112                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 113                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
 114                 Com_HexDumpToConsole(data, length);
 115         }
 116         return ret;
 117 }
 118
 119 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
 120 {
 121         // note this does not include the trailing NULL because we add that in the parser
 122         return NetConn_Write(mysocket, string, strlen(string), peeraddress);
 123 }
 124
 125 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
 126 {
 127         unsigned int packetLen;
 128         unsigned int dataLen;
 129         unsigned int eom;
 130         unsigned int *header;
 131
 132 //#ifdef DEBUG
 133         if (data->cursize == 0)
 134                 Sys_Error("Datagram_SendMessage: zero length message\n");
 135
 136         if (data->cursize > NET_MAXMESSAGE)
 137                 Sys_Error("Datagram_SendMessage: message too big %u\n", data->cursize);
 138
 139         if (conn->canSend == false)
 140                 Sys_Error("SendMessage: called with canSend == false\n");
 141 //#endif
 142
 143         memcpy(conn->sendMessage, data->data, data->cursize);
 144         conn->sendMessageLength = data->cursize;
 145
 146         if (conn->sendMessageLength <= MAX_DATAGRAM)
 147         {
 148                 dataLen = conn->sendMessageLength;
 149                 eom = NETFLAG_EOM;
 150         }
 151         else
 152         {
 153                 dataLen = MAX_DATAGRAM;
 154                 eom = 0;
 155         }
 156
 157         packetLen = NET_HEADERSIZE + dataLen;
 158
 159         header = (void *)sendbuffer;
 160         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 161         header[1] = BigLong(conn->sendSequence);
 162         memcpy(sendbuffer + 8, conn->sendMessage, dataLen);
 163
 164         conn->sendSequence++;
 165         conn->canSend = false;
 166
 167         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 168                 return -1;
 169
 170         conn->lastSendTime = realtime;
 171         packetsSent++;
 172         reliableMessagesSent++;
 173         return 1;
 174 }
 175
 176 static void NetConn_SendMessageNext(netconn_t *conn)
 177 {
 178         unsigned int packetLen;
 179         unsigned int dataLen;
 180         unsigned int eom;
 181         unsigned int *header;
 182
 183         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
 184         {
 185                 if (conn->sendMessageLength <= MAX_DATAGRAM)
 186                 {
 187                         dataLen = conn->sendMessageLength;
 188                         eom = NETFLAG_EOM;
 189                 }
 190                 else
 191                 {
 192                         dataLen = MAX_DATAGRAM;
 193                         eom = 0;
 194                 }
 195
 196                 packetLen = NET_HEADERSIZE + dataLen;
 197
 198                 header = (void *)sendbuffer;
 199                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 200                 header[1] = BigLong(conn->sendSequence);
 201                 memcpy(sendbuffer + 8, conn->sendMessage, dataLen);
 202
 203                 conn->sendSequence++;
 204                 conn->sendNext = false;
 205
 206                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 207                         return;
 208
 209                 conn->lastSendTime = realtime;
 210                 packetsSent++;
 211         }
 212 }
 213
 214 static void NetConn_ReSendMessage(netconn_t *conn)
 215 {
 216         unsigned int packetLen;
 217         unsigned int dataLen;
 218         unsigned int eom;
 219         unsigned int *header;
 220
 221         if (conn->sendMessageLength && !conn->canSend && (realtime - conn->lastSendTime) > 1.0)
 222         {
 223                 if (conn->sendMessageLength <= MAX_DATAGRAM)
 224                 {
 225                         dataLen = conn->sendMessageLength;
 226                         eom = NETFLAG_EOM;
 227                 }
 228                 else
 229                 {
 230                         dataLen = MAX_DATAGRAM;
 231                         eom = 0;
 232                 }
 233
 234                 packetLen = NET_HEADERSIZE + dataLen;
 235
 236                 header = (void *)sendbuffer;
 237                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
 238                 header[1] = BigLong(conn->sendSequence - 1);
 239                 memcpy(sendbuffer + 8, conn->sendMessage, dataLen);
 240
 241                 conn->sendNext = false;
 242
 243                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 244                         return;
 245
 246                 conn->lastSendTime = realtime;
 247                 packetsReSent++;
 248         }
 249 }
 250
 251 qboolean NetConn_CanSendMessage(netconn_t *conn)
 252 {
 253         return conn->canSend;
 254 }
 255
 256 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
 257 {
 258         int packetLen;
 259         int *header;
 260
 261 #ifdef DEBUG
 262         if (data->cursize == 0)
 263                 Sys_Error("Datagram_SendUnreliableMessage: zero length message\n");
 264
 265         if (data->cursize > MAX_DATAGRAM)
 266                 Sys_Error("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
 267 #endif
 268
 269         packetLen = NET_HEADERSIZE + data->cursize;
 270
 271         header = (void *)sendbuffer;
 272         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
 273         header[1] = BigLong(conn->unreliableSendSequence);
 274         memcpy(sendbuffer + 8, data->data, data->cursize);
 275
 276         conn->unreliableSendSequence++;
 277
 278         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
 279                 return -1;
 280
 281         packetsSent++;
 282         unreliableMessagesSent++;
 283         return 1;
 284 }
 285
 286 void NetConn_CloseClientPorts(void)
 287 {
 288         for (;cl_numsockets > 0;cl_numsockets--)
 289                 if (cl_sockets[cl_numsockets - 1])
 290                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
 291 }
 292
 293 void NetConn_OpenClientPorts(void)
 294 {
 295         int port;
 296         lhnetaddress_t address;
 297         NetConn_CloseClientPorts();
 298         port = bound(0, cl_netport.integer, 65535);
 299         if (cl_netport.integer != port)
 300                 Cvar_SetValueQuick(&cl_netport, port);
 301         LHNETADDRESS_FromString(&address, "local", port);
 302         cl_sockets[cl_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 303         LHNETADDRESS_FromString(&address, cl_netaddress.string, port);
 304         cl_sockets[cl_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 305         LHNETADDRESS_FromString(&address, cl_netaddress_ipv6.string, port);
 306         cl_sockets[cl_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 307 }
 308
 309 void NetConn_CloseServerPorts(void)
 310 {
 311         for (;sv_numsockets > 0;sv_numsockets--)
 312                 if (sv_sockets[sv_numsockets - 1])
 313                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
 314 }
 315
 316 void NetConn_OpenServerPorts(int opennetports)
 317 {
 318         int port;
 319         lhnetaddress_t address;
 320         NetConn_CloseServerPorts();
 321         port = bound(0, sv_netport.integer, 65535);
 322         if (port == 0)
 323                 port = 26000;
 324         if (sv_netport.integer != port)
 325                 Cvar_SetValueQuick(&sv_netport, port);
 326         LHNETADDRESS_FromString(&address, "local", port);
 327         sv_sockets[sv_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 328         if (opennetports)
 329         {
 330                 LHNETADDRESS_FromString(&address, sv_netaddress.string, port);
 331                 sv_sockets[sv_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 332                 LHNETADDRESS_FromString(&address, sv_netaddress_ipv6.string, port);
 333                 sv_sockets[sv_numsockets++] = LHNET_OpenSocket_Connectionless(&address);
 334         }
 335 }
 336
 337 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
 338 {
 339         int i, a = LHNETADDRESS_GetAddressType(address);
 340         for (i = 0;i < cl_numsockets;i++)
 341                 if (LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
 342                         return cl_sockets[i];
 343         return NULL;
 344 }
 345
 346 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
 347 {
 348         int i, a = LHNETADDRESS_GetAddressType(address);
 349         for (i = 0;i < sv_numsockets;i++)
 350                 if (LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
 351                         return sv_sockets[i];
 352         return NULL;
 353 }
 354
 355 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 356 {
 357         netconn_t *conn;
 358         conn = Mem_Alloc(netconn_mempool, sizeof(*conn));
 359         conn->mysocket = mysocket;
 360         conn->peeraddress = *peeraddress;
 361         conn->canSend = true;
 362         conn->connecttime = realtime;
 363         conn->lastMessageTime = realtime;
 364         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
 365         // reduce effectiveness of connection request floods
 366         conn->timeout = realtime + net_connecttimeout.value;
 367         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
 368         conn->next = netconn_list;
 369         netconn_list = conn;
 370         return conn;
 371 }
 372
 373 void NetConn_Close(netconn_t *conn)
 374 {
 375         netconn_t *c;
 376         // remove connection from list
 377         if (conn == netconn_list)
 378                 netconn_list = conn->next;
 379         else
 380         {
 381                 for (c = netconn_list;c;c = c->next)
 382                 {
 383                         if (c->next == conn)
 384                         {
 385                                 c->next = conn->next;
 386                                 break;
 387                         }
 388                 }
 389                 // not found in list, we'll avoid crashing here...
 390                 if (!c)
 391                         return;
 392         }
 393         // free connection
 394         Mem_Free(conn);
 395 }
 396
 397 static int clientport = -1;
 398 static int clientport2 = -1;
 399 static int hostport = -1;
 400 static void NetConn_UpdateServerStuff(void)
 401 {
 402         if (clientport2 != cl_netport.integer)
 403         {
 404                 clientport2 = cl_netport.integer;
 405                 if (cls.state == ca_connected)
 406                         Con_Printf("Changing \"cl_port\" will not take effect until you reconnect.\n");
 407         }
 408         if (cls.state != ca_dedicated)
 409         {
 410                 if (cls.state == ca_disconnected && clientport != cl_netport.integer)
 411                 {
 412                         clientport = cl_netport.integer;
 413                         NetConn_CloseClientPorts();
 414                 }
 415                 if (cl_numsockets == 0)
 416                         NetConn_OpenClientPorts();
 417         }
 418
 419         if (hostport != sv_netport.integer)
 420         {
 421                 hostport = sv_netport.integer;
 422                 if (sv.active)
 423                         Con_Printf("Changing \"port\" will not take effect until \"map\" command is executed.\n");
 424         }
 425 }
 426
 427 int NetConn_ReceivedMessage(netconn_t *conn, qbyte *data, int length)
 428 {
 429         unsigned int count;
 430         unsigned int flags;
 431         unsigned int sequence;
 432
 433         if (length >= 8)
 434         {
 435                 length = BigLong(((int *)data)[0]);
 436                 flags = length & ~NETFLAG_LENGTH_MASK;
 437                 length &= NETFLAG_LENGTH_MASK;
 438                 // control packets were already handled
 439                 if (!(flags & NETFLAG_CTL))
 440                 {
 441                         sequence = BigLong(((int *)data)[1]);
 442                         packetsReceived++;
 443                         data += 8;
 444                         length -= 8;
 445                         if (flags & NETFLAG_UNRELIABLE)
 446                         {
 447                                 if (sequence >= conn->unreliableReceiveSequence)
 448                                 {
 449                                         if (sequence > conn->unreliableReceiveSequence)
 450                                         {
 451                                                 count = sequence - conn->unreliableReceiveSequence;
 452                                                 droppedDatagrams += count;
 453                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
 454                                         }
 455                                         conn->unreliableReceiveSequence = sequence + 1;
 456                                         conn->lastMessageTime = realtime;
 457                                         conn->timeout = realtime + net_messagetimeout.value;
 458                                         unreliableMessagesReceived++;
 459                                         if (length > 0)
 460                                         {
 461                                                 SZ_Clear(&net_message);
 462                                                 SZ_Write(&net_message, data, length);
 463                                                 MSG_BeginReading();
 464                                                 return 2;
 465                                         }
 466                                 }
 467                                 else
 468                                         Con_DPrintf("Got a stale datagram\n");
 469                                 return 1;
 470                         }
 471                         else if (flags & NETFLAG_ACK)
 472                         {
 473                                 if (sequence == (conn->sendSequence - 1))
 474                                 {
 475                                         if (sequence == conn->ackSequence)
 476                                         {
 477                                                 conn->ackSequence++;
 478                                                 if (conn->ackSequence != conn->sendSequence)
 479                                                         Con_DPrintf("ack sequencing error\n");
 480                                                 conn->lastMessageTime = realtime;
 481                                                 conn->timeout = realtime + net_messagetimeout.value;
 482                                                 conn->sendMessageLength -= MAX_DATAGRAM;
 483                                                 if (conn->sendMessageLength > 0)
 484                                                 {
 485                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_DATAGRAM, conn->sendMessageLength);
 486                                                         conn->sendNext = true;
 487                                                         NetConn_SendMessageNext(conn);
 488                                                 }
 489                                                 else
 490                                                 {
 491                                                         conn->sendMessageLength = 0;
 492                                                         conn->canSend = true;
 493                                                 }
 494                                         }
 495                                         else
 496                                                 Con_DPrintf("Duplicate ACK received\n");
 497                                 }
 498                                 else
 499                                         Con_DPrintf("Stale ACK received\n");
 500                                 return 1;
 501                         }
 502                         else if (flags & NETFLAG_DATA)
 503                         {
 504                                 unsigned int temppacket[2];
 505                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
 506                                 temppacket[1] = BigLong(sequence);
 507                                 NetConn_Write(conn->mysocket, (qbyte *)temppacket, 8, &conn->peeraddress);
 508                                 if (sequence == conn->receiveSequence)
 509                                 {
 510                                         conn->lastMessageTime = realtime;
 511                                         conn->timeout = realtime + net_messagetimeout.value;
 512                                         conn->receiveSequence++;
 513                                         memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
 514                                         conn->receiveMessageLength += length;
 515                                         if (flags & NETFLAG_EOM)
 516                                         {
 517                                                 reliableMessagesReceived++;
 518                                                 length = conn->receiveMessageLength;
 519                                                 conn->receiveMessageLength = 0;
 520                                                 if (length > 0)
 521                                                 {
 522                                                         SZ_Clear(&net_message);
 523                                                         SZ_Write(&net_message, conn->receiveMessage, length);
 524                                                         MSG_BeginReading();
 525                                                         return 2;
 526                                                 }
 527                                         }
 528                                 }
 529                                 else
 530                                         receivedDuplicateCount++;
 531                                 return 1;
 532                         }
 533                 }
 534         }
 535         return 0;
 536 }
 537
 538 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
 539 {
 540         cls.netcon = NetConn_Open(mysocket, peeraddress);
 541         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
 542         key_dest = key_game;
 543         m_state = m_none;
 544         cls.connect_trying = false;
 545         cls.demonum = -1;                       // not in the demo loop now
 546         cls.state = ca_connected;
 547         cls.signon = 0;                         // need all the signon messages before playing
 548         CL_ClearState();
 549         Host_Reconnect_f();
 550 }
 551
 552 static struct
 553 {
 554         double senttime;
 555         lhnetaddress_t peeraddress;
 556 }
 557 pingcache[HOSTCACHESIZE];
 558
 559 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 560 {
 561         int ret, c, control;
 562         lhnetaddress_t svaddress;
 563         const char *s;
 564         char *string, addressstring2[128], cname[128], ipstring[32];
 565         char stringbuf[16384];
 566
 567         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 568         {
 569                 // received a command string - strip off the packaging and put it
 570                 // into our string buffer with NULL termination
 571                 data += 4;
 572                 length -= 4;
 573                 length = min(length, (int)sizeof(stringbuf) - 1);
 574                 memcpy(stringbuf, data, length);
 575                 stringbuf[length] = 0;
 576                 string = stringbuf;
 577
 578                 if (developer.integer)
 579                 {
 580                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 581                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
 582                         Com_HexDumpToConsole(data, length);
 583                 }
 584
 585                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
 586                 {
 587                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 588                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
 589                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\challenge\\%s", string + 10), peeraddress);
 590                         return true;
 591                 }
 592                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
 593                 {
 594                         NetConn_ConnectionEstablished(mysocket, peeraddress);
 595                         return true;
 596                 }
 597                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
 598                 {
 599                         cls.connect_trying = false;
 600                         string += 7;
 601                         length = max(length - 7, (int)sizeof(m_return_reason) - 1);
 602                         memcpy(m_return_reason, string, length);
 603                         m_return_reason[length] = 0;
 604                         Con_Printf("%s\n", m_return_reason);
 605                         return true;
 606                 }
 607                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
 608                 {
 609                         int i, j, c, n, users, maxusers;
 610                         char game[32], mod[32], map[32], name[128];
 611                         double pingtime;
 612                         hostcache_t temp;
 613                         string += 13;
 614                         // hostcache only uses text addresses
 615                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
 616                         // search the cache for this server
 617                         for (n = 0; n < hostCacheCount; n++)
 618                                 if (!strcmp(cname, hostcache[n].cname))
 619                                         break;
 620                         // add it or update it
 621                         if (n == hostCacheCount)
 622                         {
 623                                 // if cache is full replace highest ping server (the list is
 624                                 // kept sorted so this is always the last, and if this server
 625                                 // is good it will be sorted into an early part of the list)
 626                                 if (hostCacheCount >= HOSTCACHESIZE)
 627                                         n = hostCacheCount - 1;
 628                                 else
 629                                         hostCacheCount++;
 630                         }
 631                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strncpy(game, s, sizeof(game) - 1);else game[0] = 0;
 632                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strncpy(mod , s, sizeof(mod ) - 1);else mod[0] = 0;
 633                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strncpy(map , s, sizeof(map ) - 1);else map[0] = 0;
 634                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strncpy(name, s, sizeof(name) - 1);else name[0] = 0;
 635                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) c = atoi(s);else c = -1;
 636                         if ((s = SearchInfostring(string, "clients"      )) != NULL) users = atoi(s);else users = 0;
 637                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) maxusers = atoi(s);else maxusers = 0;
 638                         pingtime = 9999;
 639                         for (i = 0;i < HOSTCACHESIZE;i++)
 640                                 if (!LHNETADDRESS_Compare(peeraddress, &pingcache[i].peeraddress))
 641                                         pingtime = (int)(realtime - pingcache[i].senttime);
 642                         pingtime = bound(0, pingtime, 9999);
 643                         memset(&hostcache[n], 0, sizeof(hostcache[n]));
 644                         // store the data the engine cares about (address and ping)
 645                         strcpy(hostcache[n].cname, cname);
 646                         hostcache[n].ping = pingtime;
 647                         // build description strings for the things users care about
 648                         snprintf(hostcache[n].line1, sizeof(hostcache[n].line1), "%5d%c%3u/%3u %-65.65s", (int)pingtime, c != NET_PROTOCOL_VERSION ? '*' : ' ', users, maxusers, name);
 649                         snprintf(hostcache[n].line2, sizeof(hostcache[n].line2), "%-21.21s %-19.19s %-17.17s %-20.20s", cname, game, mod, map);
 650                         // if ping is especially high, display it as such
 651                         if (pingtime >= 300)
 652                         {
 653                                 // orange numbers (lower block)
 654                                 for (i = 0;i < 5;i++)
 655                                         if (hostcache[n].line1[i] != ' ')
 656                                                 hostcache[n].line1[i] += 128;
 657                         }
 658                         else if (pingtime >= 200)
 659                         {
 660                                 // yellow numbers (in upper block)
 661                                 for (i = 0;i < 5;i++)
 662                                         if (hostcache[n].line1[i] != ' ')
 663                                                 hostcache[n].line1[i] -= 30;
 664                         }
 665                         // if not in the slist menu we should print the server to console
 666                         if (m_state != m_slist)
 667                                 Con_Printf("%s\n%s\n", hostcache[n].line1, hostcache[n].line2);
 668                         // and finally, re-sort the list
 669                         for (i = 0;i < hostCacheCount;i++)
 670                         {
 671                                 for (j = i + 1;j < hostCacheCount;j++)
 672                                 {
 673                                         //if (strcmp(hostcache[j].name, hostcache[i].name) < 0)
 674                                         if (hostcache[i].ping > hostcache[j].ping)
 675                                         {
 676                                                 memcpy(&temp, &hostcache[j], sizeof(hostcache_t));
 677                                                 memcpy(&hostcache[j], &hostcache[i], sizeof(hostcache_t));
 678                                                 memcpy(&hostcache[i], &temp, sizeof(hostcache_t));
 679                                         }
 680                                 }
 681                         }
 682                         return true;
 683                 }
 684                 if (!strncmp(string, "getserversResponse\\", 19) && hostCacheCount < HOSTCACHESIZE)
 685                 {
 686                         int i, best;
 687                         double besttime;
 688                         // Extract the IP addresses
 689                         data += 18;
 690                         length -= 18;
 691                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
 692                         {
 693                                 sprintf(ipstring, "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
 694                                 if (developer.integer)
 695                                         Con_Printf("Requesting info from server %s\n", ipstring);
 696                                 LHNETADDRESS_FromString(&svaddress, ipstring, 0);
 697                                 NetConn_WriteString(mysocket, "\377\377\377\377getinfo", &svaddress);
 698                                 // replace oldest or matching entry in ping cache
 699                                 // we scan this later when getting a reply to see how long it took
 700                                 besttime = realtime;
 701                                 best = 0;
 702                                 for (i = 0;i < HOSTCACHESIZE;i++)
 703                                 {
 704                                         if (!LHNETADDRESS_Compare(&svaddress, &pingcache[i].peeraddress))
 705                                         {
 706                                                 best = i;
 707                                                 break;
 708                                         }
 709                                         if (besttime > pingcache[i].senttime)
 710                                         {
 711                                                 besttime = pingcache[i].senttime;
 712                                                 best = i;
 713                                                 // if ping cache isn't full yet we can skip out early
 714                                                 if (!besttime)
 715                                                         break;
 716                                         }
 717                                 }
 718                                 pingcache[best].peeraddress = svaddress;
 719                                 pingcache[best].senttime = realtime;
 720                                 // move on to next address in packet
 721                                 data += 7;
 722                                 length -= 7;
 723                         }
 724                         return true;
 725                 }
 726                 /*
 727                 if (!strncmp(string, "ping", 4))
 728                 {
 729                         if (developer.integer)
 730                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
 731                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
 732                         return true;
 733                 }
 734                 if (!strncmp(string, "ack", 3))
 735                         return true;
 736                 */
 737                 // we may not have liked the packet, but it was a command packet, so
 738                 // we're done processing this packet now
 739                 return true;
 740         }
 741         // netquake control packets, supported for compatibility only
 742         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
 743         {
 744                 c = data[4];
 745                 data += 5;
 746                 length -= 5;
 747                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 748                 switch (c)
 749                 {
 750                 case CCREP_ACCEPT:
 751                         if (developer.integer)
 752                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
 753                         if (cls.connect_trying)
 754                         {
 755                                 lhnetaddress_t clientportaddress;
 756                                 clientportaddress = *peeraddress;
 757                                 if (length >= 4)
 758                                 {
 759                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
 760                                         data += 4;
 761                                         length -= 4;
 762                                         LHNETADDRESS_SetPort(&clientportaddress, port);
 763                                 }
 764                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress);
 765                         }
 766                         break;
 767                 case CCREP_REJECT:
 768                         if (developer.integer)
 769                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
 770                         Con_Printf("%s\n", data);
 771                         strncpy(m_return_reason, data, sizeof(m_return_reason) - 1);
 772                         break;
 773 #if 0
 774                 case CCREP_SERVER_INFO:
 775                         if (developer.integer)
 776                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
 777                         if (cls.state != ca_dedicated)
 778                         {
 779                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
 780                                 // string we just ignore it and keep the real address
 781                                 MSG_ReadString();
 782                                 // hostcache only uses text addresses
 783                                 cname = UDP_AddrToString(readaddr);
 784                                 // search the cache for this server
 785                                 for (n = 0; n < hostCacheCount; n++)
 786                                         if (!strcmp(cname, hostcache[n].cname))
 787                                                 break;
 788                                 // add it
 789                                 if (n == hostCacheCount && hostCacheCount < HOSTCACHESIZE)
 790                                 {
 791                                         hostCacheCount++;
 792                                         memset(&hostcache[n], 0, sizeof(hostcache[n]));
 793                                         strcpy(hostcache[n].name, MSG_ReadString());
 794                                         strcpy(hostcache[n].map, MSG_ReadString());
 795                                         hostcache[n].users = MSG_ReadByte();
 796                                         hostcache[n].maxusers = MSG_ReadByte();
 797                                         c = MSG_ReadByte();
 798                                         if (c != NET_PROTOCOL_VERSION)
 799                                         {
 800                                                 strncpy(hostcache[n].cname, hostcache[n].name, sizeof(hostcache[n].cname) - 1);
 801                                                 hostcache[n].cname[sizeof(hostcache[n].cname) - 1] = 0;
 802                                                 strcpy(hostcache[n].name, "*");
 803                                                 strncat(hostcache[n].name, hostcache[n].cname, sizeof(hostcache[n].name) - 1);
 804                                                 hostcache[n].name[sizeof(hostcache[n].name) - 1] = 0;
 805                                         }
 806                                         strcpy(hostcache[n].cname, cname);
 807                                 }
 808                         }
 809                         break;
 810                 case CCREP_PLAYER_INFO:
 811                         // we got a CCREP_PLAYER_INFO??
 812                         //if (developer.integer)
 813                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
 814                         break;
 815                 case CCREP_RULE_INFO:
 816                         // we got a CCREP_RULE_INFO??
 817                         //if (developer.integer)
 818                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
 819                         break;
 820 #endif
 821                 default:
 822                         break;
 823                 }
 824                 // we may not have liked the packet, but it was a valid control
 825                 // packet, so we're done processing this packet now
 826                 return true;
 827         }
 828         ret = 0;
 829         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)
 830                 CL_ParseServerMessage();
 831         return ret;
 832 }
 833
 834 void NetConn_ClientFrame(void)
 835 {
 836         int i, length;
 837         lhnetaddress_t peeraddress;
 838         netconn_t *conn;
 839         NetConn_UpdateServerStuff();
 840         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
 841         {
 842                 if (cls.connect_remainingtries == 0)
 843                 {
 844                         cls.connect_trying = false;
 845                         Host_Error("Connect failed\n");
 846                         return;
 847                 }
 848                 if (cls.connect_nextsendtime)
 849                         Con_Printf("Still trying...\n");
 850                 else
 851                         Con_Printf("Trying...\n");
 852                 cls.connect_nextsendtime = realtime + 1;
 853                 cls.connect_remainingtries--;
 854                 // try challenge first (newer server)
 855                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
 856                 // then try netquake as a fallback (old server, or netquake)
 857                 SZ_Clear(&net_message);
 858                 // save space for the header, filled in later
 859                 MSG_WriteLong(&net_message, 0);
 860                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
 861                 MSG_WriteString(&net_message, "QUAKE");
 862                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
 863                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
 864                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
 865                 SZ_Clear(&net_message);
 866         }
 867         for (i = 0;i < cl_numsockets;i++)
 868                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
 869                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
 870         if (cls.netcon && realtime > cls.netcon->timeout)
 871         {
 872                 Con_Printf("Connection timed out\n");
 873                 CL_Disconnect();
 874         }
 875         for (conn = netconn_list;conn;conn = conn->next)
 876                 NetConn_ReSendMessage(conn);
 877 }
 878
 879 #define MAX_CHALLENGES 128
 880 struct
 881 {
 882         lhnetaddress_t address;
 883         double time;
 884         char string[12];
 885 }
 886 challenge[MAX_CHALLENGES];
 887
 888 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
 889 {
 890         int i;
 891         char c;
 892         for (i = 0;i < bufferlength - 1;i++)
 893         {
 894                 do
 895                 {
 896                         c = rand () % (127 - 33) + 33;
 897                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
 898                 buffer[i] = c;
 899         }
 900         buffer[i] = 0;
 901 }
 902
 903 extern void SV_ConnectClient(int clientnum, netconn_t *netconnection);
 904 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
 905 {
 906         int i, n, ret, clientnum, responselength, best;
 907         double besttime;
 908         client_t *client;
 909         netconn_t *conn;
 910         char *s, *string, response[512], addressstring2[128], stringbuf[16384];
 911
 912         if (sv.active)
 913         {
 914                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
 915                 {
 916                         // received a command string - strip off the packaging and put it
 917                         // into our string buffer with NULL termination
 918                         data += 4;
 919                         length -= 4;
 920                         length = min(length, (int)sizeof(stringbuf) - 1);
 921                         memcpy(stringbuf, data, length);
 922                         stringbuf[length] = 0;
 923                         string = stringbuf;
 924
 925                         if (developer.integer)
 926                         {
 927                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
 928                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
 929                                 Com_HexDumpToConsole(data, length);
 930                         }
 931
 932                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
 933                         {
 934                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
 935                                 {
 936                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
 937                                                 break;
 938                                         if (besttime > challenge[i].time)
 939                                                 besttime = challenge[best = i].time;
 940                                 }
 941                                 // if we did not find an exact match, choose the oldest and
 942                                 // update address and string
 943                                 if (i == MAX_CHALLENGES)
 944                                 {
 945                                         i = best;
 946                                         challenge[i].address = *peeraddress;
 947                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
 948                                 }
 949                                 challenge[i].time = realtime;
 950                                 // send the challenge
 951                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
 952                                 return true;
 953                         }
 954                         if (length > 8 && !memcmp(string, "connect\\", 8))
 955                         {
 956                                 string += 7;
 957                                 length -= 7;
 958                                 if ((s = SearchInfostring(string, "challenge")))
 959                                 {
 960                                         // validate the challenge
 961                                         for (i = 0;i < MAX_CHALLENGES;i++)
 962                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
 963                                                         break;
 964                                         if (i < MAX_CHALLENGES)
 965                                         {
 966                                                 // check engine protocol
 967                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
 968                                                 {
 969                                                         if (developer.integer)
 970                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
 971                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
 972                                                 }
 973                                                 else
 974                                                 {
 975                                                         // see if this is a duplicate connection request
 976                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
 977                                                                 if (client->active && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
 978                                                                         break;
 979                                                         if (clientnum < svs.maxclients)
 980                                                         {
 981                                                                 // duplicate connection request
 982                                                                 if (realtime - client->netconnection->connecttime < 2.0)
 983                                                                 {
 984                                                                         // client is still trying to connect,
 985                                                                         // so we send a duplicate reply
 986                                                                         if (developer.integer)
 987                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
 988                                                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
 989                                                                 }
 990                                                                 // only kick if old connection seems dead
 991                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
 992                                                                 {
 993                                                                         // kick off connection and await retry
 994                                                                         client->deadsocket = true;
 995                                                                 }
 996                                                         }
 997                                                         else
 998                                                         {
 999                                                                 // this is a new client, find a slot
1000                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1001                                                                         if (!client->active)
1002                                                                                 break;
1003                                                                 if (clientnum == svs.maxclients)
1004                                                                 {
1005                                                                         // server is full
1006                                                                         if (developer.integer)
1007                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1008                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1009                                                                 }
1010                                                                 else
1011                                                                 {
1012                                                                         if ((conn = NetConn_Open(mysocket, peeraddress)))
1013                                                                         {
1014                                                                                 // allocated connection
1015                                                                                 strcpy(conn->address, addressstring2);
1016                                                                                 if (developer.integer)
1017                                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", addressstring2);
1018                                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1019                                                                                 // now set up the client struct
1020                                                                                 SV_ConnectClient(clientnum, conn);
1021                                                                                 NetConn_Heartbeat(1);
1022                                                                         }
1023                                                                 }
1024                                                         }
1025                                                 }
1026                                         }
1027                                 }
1028                                 return true;
1029                         }
1030                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1031                         {
1032                                 const char *challenge = NULL;
1033                                 // If there was a challenge in the getinfo message
1034                                 if (length > 8 && string[7] == ' ')
1035                                         challenge = string + 8;
1036                                 for (i = 0, n = 0;i < svs.maxclients;i++)
1037                                         if (svs.clients[i].active)
1038                                                 n++;
1039                                 responselength = snprintf(response, sizeof(response), "\377\377\377\377infoResponse\x0A"
1040                                                         "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
1041                                                         "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d%s%s",
1042                                                         gamename, com_modname, svs.maxclients, n,
1043                                                         sv.name, hostname.string, NET_PROTOCOL_VERSION, challenge ? "\\challenge\\" : "", challenge ? challenge : "");
1044                                 // does it fit in the buffer?
1045                                 if (responselength < (int)sizeof(response))
1046                                 {
1047                                         if (developer.integer)
1048                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1049                                         NetConn_WriteString(mysocket, response, peeraddress);
1050                                 }
1051                                 return true;
1052                         }
1053                         /*
1054                         if (!strncmp(string, "ping", 4))
1055                         {
1056                                 if (developer.integer)
1057                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1058                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1059                                 return true;
1060                         }
1061                         if (!strncmp(string, "ack", 3))
1062                                 return true;
1063                         */
1064                         // we may not have liked the packet, but it was a command packet, so
1065                         // we're done processing this packet now
1066                         return true;
1067                 }
1068                 // LordHavoc: disabled netquake control packet support in server
1069 #if 0
1070                 {
1071                         int c, control;
1072                         // netquake control packets, supported for compatibility only
1073                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1074                         {
1075                                 c = data[4];
1076                                 data += 5;
1077                                 length -= 5;
1078                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1079                                 switch (c)
1080                                 {
1081                                 case CCREQ_CONNECT:
1082                                         //if (developer.integer)
1083                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1084                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
1085                                         {
1086                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1087                                                 {
1088                                                         if (developer.integer)
1089                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1090                                                         SZ_Clear(&net_message);
1091                                                         // save space for the header, filled in later
1092                                                         MSG_WriteLong(&net_message, 0);
1093                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1094                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
1095                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1096                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1097                                                         SZ_Clear(&net_message);
1098                                                 }
1099                                                 else
1100                                                 {
1101                                                         // see if this is a duplicate connection request
1102                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1103                                                                 if (client->active && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1104                                                                         break;
1105                                                         if (clientnum < svs.maxclients)
1106                                                         {
1107                                                                 // duplicate connection request
1108                                                                 if (realtime - client->netconnection->connecttime < 2.0)
1109                                                                 {
1110                                                                         // client is still trying to connect,
1111                                                                         // so we send a duplicate reply
1112                                                                         if (developer.integer)
1113                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1114                                                                         SZ_Clear(&net_message);
1115                                                                         // save space for the header, filled in later
1116                                                                         MSG_WriteLong(&net_message, 0);
1117                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1118                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1119                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1120                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1121                                                                         SZ_Clear(&net_message);
1122                                                                 }
1123                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1124                                                                 {
1125                                                                         // the old client hasn't sent us anything
1126                                                                         // in quite a while, so kick off and let
1127                                                                         // the retry take care of it...
1128                                                                         client->deadsocket = true;
1129                                                                 }
1130                                                         }
1131                                                         else
1132                                                         {
1133                                                                 // this is a new client, find a slot
1134                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1135                                                                         if (!client->active)
1136                                                                                 break;
1137                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
1138                                                                 {
1139                                                                         // connect to the client
1140                                                                         // everything is allocated, just fill in the details
1141                                                                         strcpy(conn->address, addressstring2);
1142                                                                         if (developer.integer)
1143                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
1144                                                                         // send back the info about the server connection
1145                                                                         SZ_Clear(&net_message);
1146                                                                         // save space for the header, filled in later
1147                                                                         MSG_WriteLong(&net_message, 0);
1148                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1149                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
1150                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1151                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1152                                                                         SZ_Clear(&net_message);
1153                                                                         // now set up the client struct
1154                                                                         SV_ConnectClient(clientnum, conn);
1155                                                                         NetConn_Heartbeat(1);
1156                                                                 }
1157                                                                 else
1158                                                                 {
1159                                                                         //if (developer.integer)
1160                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
1161                                                                         // no room; try to let player know
1162                                                                         SZ_Clear(&net_message);
1163                                                                         // save space for the header, filled in later
1164                                                                         MSG_WriteLong(&net_message, 0);
1165                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1166                                                                         MSG_WriteString(&net_message, "Server is full.\n");
1167                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1168                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1169                                                                         SZ_Clear(&net_message);
1170                                                                 }
1171                                                         }
1172                                                 }
1173                                         }
1174                                         break;
1175 #if 0
1176                                 case CCREQ_SERVER_INFO:
1177                                         if (developer.integer)
1178                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
1179                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
1180                                         {
1181                                                 if (developer.integer)
1182                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
1183                                                 SZ_Clear(&net_message);
1184                                                 // save space for the header, filled in later
1185                                                 MSG_WriteLong(&net_message, 0);
1186                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1187                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1188                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1189                                                 MSG_WriteString(&net_message, hostname.string);
1190                                                 MSG_WriteString(&net_message, sv.name);
1191                                                 MSG_WriteByte(&net_message, net_activeconnections);
1192                                                 MSG_WriteByte(&net_message, svs.maxclients);
1193                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1194                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1195                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1196                                                 SZ_Clear(&net_message);
1197                                         }
1198                                         break;
1199                                 case CCREQ_PLAYER_INFO:
1200                                         if (developer.integer)
1201                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1202                                         if (sv.active)
1203                                         {
1204                                                 int playerNumber, activeNumber, clientNumber;
1205                                                 client_t *client;
1206
1207                                                 playerNumber = MSG_ReadByte();
1208                                                 activeNumber = -1;
1209                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1210                                                         if (client->active && ++activeNumber == playerNumber)
1211                                                                 break;
1212                                                 if (clientNumber != svs.maxclients)
1213                                                 {
1214                                                         SZ_Clear(&net_message);
1215                                                         // save space for the header, filled in later
1216                                                         MSG_WriteLong(&net_message, 0);
1217                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1218                                                         MSG_WriteByte(&net_message, playerNumber);
1219                                                         MSG_WriteString(&net_message, client->name);
1220                                                         MSG_WriteLong(&net_message, client->colors);
1221                                                         MSG_WriteLong(&net_message, (int)client->edict->v->frags);
1222                                                         MSG_WriteLong(&net_message, (int)(realtime - client->netconnection->connecttime));
1223                                                         MSG_WriteString(&net_message, client->netconnection->address);
1224                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1225                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1226                                                         SZ_Clear(&net_message);
1227                                                 }
1228                                         }
1229                                         break;
1230                                 case CCREQ_RULE_INFO:
1231                                         if (developer.integer)
1232                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1233                                         if (sv.active)
1234                                         {
1235                                                 char *prevCvarName;
1236                                                 cvar_t *var;
1237
1238                                                 // find the search start location
1239                                                 prevCvarName = MSG_ReadString();
1240                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1241
1242                                                 // send the response
1243                                                 SZ_Clear(&net_message);
1244                                                 // save space for the header, filled in later
1245                                                 MSG_WriteLong(&net_message, 0);
1246                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1247                                                 if (var)
1248                                                 {
1249                                                         MSG_WriteString(&net_message, var->name);
1250                                                         MSG_WriteString(&net_message, var->string);
1251                                                 }
1252                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1253                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1254                                                 SZ_Clear(&net_message);
1255                                         }
1256                                         break;
1257 #endif
1258                                 default:
1259                                         break;
1260                                 }
1261                                 // we may not have liked the packet, but it was a valid control
1262                                 // packet, so we're done processing this packet now
1263                                 return true;
1264                         }
1265                 }
1266 #endif
1267                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1268                 {
1269                         if (host_client->active && host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1270                         {
1271                                 sv_player = host_client->edict;
1272                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1273                                         SV_ReadClientMessage();
1274                                 return ret;
1275                         }
1276                 }
1277         }
1278         return 0;
1279 }
1280
1281 void NetConn_ServerFrame(void)
1282 {
1283         int i, length;
1284         lhnetaddress_t peeraddress;
1285         netconn_t *conn;
1286         NetConn_UpdateServerStuff();
1287         for (i = 0;i < sv_numsockets;i++)
1288                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1289                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1290         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1291         {
1292                 if (host_client->active && realtime > host_client->netconnection->timeout)
1293                 {
1294                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1295                         sv_player = host_client->edict;
1296                         SV_DropClient(false);
1297                 }
1298         }
1299         for (conn = netconn_list;conn;conn = conn->next)
1300                 NetConn_ReSendMessage(conn);
1301 }
1302
1303 void NetConn_QueryMasters(void)
1304 {
1305         int i;
1306         int masternum;
1307         lhnetaddress_t masteraddress;
1308         char request[256];
1309
1310         if (hostCacheCount >= HOSTCACHESIZE)
1311                 return;
1312
1313         for (i = 0;i < cl_numsockets;i++)
1314         {
1315                 if (cl_sockets[i])
1316                 {
1317 #if 0
1318                         // search LAN
1319 #if 1
1320                         UDP_Broadcast(UDP_controlSock, "\377\377\377\377getinfo", 11);
1321 #else
1322                         SZ_Clear(&net_message);
1323                         // save space for the header, filled in later
1324                         MSG_WriteLong(&net_message, 0);
1325                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1326                         MSG_WriteString(&net_message, "QUAKE");
1327                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1328                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1329                         UDP_Broadcast(UDP_controlSock, net_message.data, net_message.cursize);
1330                         SZ_Clear(&net_message);
1331 #endif
1332 #endif
1333
1334                         // build the getservers
1335                         snprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1336
1337                         // search internet
1338                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1339                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1340                                         NetConn_WriteString(cl_sockets[i], request, &masteraddress);
1341                 }
1342         }
1343 }
1344
1345 void NetConn_Heartbeat(int priority)
1346 {
1347         lhnetaddress_t masteraddress;
1348         int masternum;
1349         lhnetsocket_t *mysocket;
1350
1351         // if it's a state change (client connected), limit next heartbeat to no
1352         // more than 30 sec in the future
1353         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1354                 nextheartbeattime = realtime + 30.0;
1355
1356         // limit heartbeatperiod to 30 to 270 second range,
1357         // lower limit is to avoid abusing master servers with excess traffic,
1358         // upper limit is to avoid timing out on the master server (which uses
1359         // 300 sec timeout)
1360         if (sv_heartbeatperiod.value < 30)
1361                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1362         if (sv_heartbeatperiod.value > 270)
1363                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1364
1365         // make advertising optional and don't advertise singleplayer games, and
1366         // only send a heartbeat as often as the admin wants
1367         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1368         {
1369                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1370                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1371                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1372                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
1373         }
1374 }
1375
1376 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1377 {
1378         int i, count = 0;
1379         qbyte sent[MAX_SCOREBOARD];
1380
1381         memset(sent, 0, sizeof(sent));
1382
1383         // simultaneously wait for the first CanSendMessage and send the message,
1384         // then wait for a second CanSendMessage (verifying it was received), or
1385         // the client drops and is no longer counted
1386         // the loop aborts when either it runs out of clients to send to, or a
1387         // timeout expires
1388         blocktime += Sys_DoubleTime();
1389         do
1390         {
1391                 count = 0;
1392                 NetConn_ClientFrame();
1393                 NetConn_ServerFrame();
1394                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1395                 {
1396                         if (host_client->active)
1397                         {
1398                                 if (NetConn_CanSendMessage(host_client->netconnection))
1399                                 {
1400                                         if (!sent[i])
1401                                                 NetConn_SendReliableMessage(host_client->netconnection, data);
1402                                         sent[i] = true;
1403                                 }
1404                                 if (!NetConn_CanSendMessage(host_client->netconnection))
1405                                         count++;
1406                         }
1407                 }
1408         }
1409         while (count && Sys_DoubleTime() < blocktime);
1410         return count;
1411 }
1412
1413 static void MaxPlayers_f(void)
1414 {
1415         int n;
1416
1417         if (Cmd_Argc() != 2)
1418         {
1419                 Con_Printf("\"maxplayers\" is \"%u\"\n", svs.maxclients);
1420                 return;
1421         }
1422
1423         if (sv.active)
1424         {
1425                 Con_Printf("maxplayers can not be changed while a server is running.\n");
1426                 return;
1427         }
1428
1429         n = atoi(Cmd_Argv(1));
1430         n = bound(1, n, MAX_SCOREBOARD);
1431         if (svs.maxclients != n)
1432                 Con_Printf("\"maxplayers\" set to \"%u\"\n", n);
1433
1434         SV_SetMaxClients(n);
1435 }
1436
1437 static void Net_Heartbeat_f(void)
1438 {
1439         NetConn_Heartbeat(2);
1440 }
1441
1442 void PrintStats(netconn_t *conn)
1443 {
1444         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1445 }
1446
1447 void Net_Stats_f(void)
1448 {
1449         netconn_t *conn;
1450         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1451         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1452         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1453         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1454         Con_Printf("packetsSent                = %i\n", packetsSent);
1455         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1456         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1457         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1458         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1459         Con_Printf("connections                =\n");
1460         for (conn = netconn_list;conn;conn = conn->next)
1461                 PrintStats(conn);
1462 }
1463
1464 void Net_Slist_f(void)
1465 {
1466         hostCacheCount = 0;
1467         memset(&pingcache, 0, sizeof(pingcache));
1468         if (m_state != m_slist)
1469                 Con_Printf("Sending requests to master servers\n");
1470         NetConn_QueryMasters();
1471         if (m_state != m_slist)
1472                 Con_Printf("Listening for replies...\n");
1473 }
1474
1475 void NetConn_Init(void)
1476 {
1477         int masternum;
1478         netconn_mempool = Mem_AllocPool("Networking");
1479         Cmd_AddCommand("net_stats", Net_Stats_f);
1480         Cmd_AddCommand("net_slist", Net_Slist_f);
1481         Cmd_AddCommand("maxplayers", MaxPlayers_f);
1482         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
1483         Cvar_RegisterVariable(&net_messagetimeout);
1484         Cvar_RegisterVariable(&net_messagerejointimeout);
1485         Cvar_RegisterVariable(&net_connecttimeout);
1486         Cvar_RegisterVariable(&hostname);
1487         Cvar_RegisterVariable(&developer_networking);
1488         Cvar_RegisterVariable(&cl_netport);
1489         Cvar_RegisterVariable(&cl_netaddress);
1490         Cvar_RegisterVariable(&cl_netaddress_ipv6);
1491         Cvar_RegisterVariable(&sv_netport);
1492         Cvar_RegisterVariable(&sv_netaddress);
1493         Cvar_RegisterVariable(&sv_netaddress_ipv6);
1494         Cvar_RegisterVariable(&sv_public);
1495         Cvar_RegisterVariable(&sv_heartbeatperiod);
1496         for (masternum = 0;sv_masters[masternum].name;masternum++)
1497                 Cvar_RegisterVariable(&sv_masters[masternum]);
1498         cl_numsockets = 0;
1499         sv_numsockets = 0;
1500         memset(&pingcache, 0, sizeof(pingcache));
1501         SZ_Alloc(&net_message, NET_MAXMESSAGE, "net_message");
1502         LHNET_Init();
1503 }
1504
1505 void NetConn_Shutdown(void)
1506 {
1507         NetConn_CloseClientPorts();
1508         NetConn_CloseServerPorts();
1509         LHNET_Shutdown();
1510 }
1511