reduced cl_net* cvars to just cl_netlocalping and cl_netpacketloss and removed sv_net...
[divverent/darkplaces.git] / 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", "ghdigital.com"},
38         {0, "sv_masterextra2", "dpmaster.deathmask.net"},
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 cvar_t cl_netlocalping = {0, "cl_netlocalping","0"};
53 static cvar_t cl_netpacketloss = {0, "cl_netpacketloss","0"};
54
55
56 /* statistic counters */
57 static int packetsSent = 0;
58 static int packetsReSent = 0;
59 static int packetsReceived = 0;
60 static int receivedDuplicateCount = 0;
61 static int droppedDatagrams = 0;
62
63 static int unreliableMessagesSent = 0;
64 static int unreliableMessagesReceived = 0;
65 static int reliableMessagesSent = 0;
66 static int reliableMessagesReceived = 0;
67
68 double masterquerytime = -1000;
69 int masterquerycount = 0;
70 int masterreplycount = 0;
71 int serverquerycount = 0;
72 int serverreplycount = 0;
73
74 int hostCacheCount = 0;
75 hostcache_t hostcache[HOSTCACHESIZE];
76
77 static qbyte sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
78 static qbyte readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
79
80 int cl_numsockets;
81 lhnetsocket_t *cl_sockets[16];
82 int sv_numsockets;
83 lhnetsocket_t *sv_sockets[16];
84
85 netconn_t *netconn_list = NULL;
86 mempool_t *netconn_mempool = NULL;
87
88 cvar_t cl_netport = {0, "cl_port", "0"};
89 cvar_t sv_netport = {0, "port", "26000"};
90 cvar_t net_address = {0, "net_address", "0.0.0.0"};
91 //cvar_t net_netaddress_ipv6 = {0, "net_address_ipv6", "[0:0:0:0:0:0:0:0]"};
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_netpacketloss.integer)
98                 for (i = 0;i < cl_numsockets;i++)
99                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
100                                 return 0;
101         if (developer_networking.integer && length != 0)
102         {
103                 char addressstring[128], addressstring2[128];
104                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
105                 if (length > 0)
106                 {
107                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
108                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
109                         Com_HexDumpToConsole(data, length);
110                 }
111                 else
112                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
113         }
114         return length;
115 }
116
117 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
118 {
119         int ret;
120         int i;
121         if (cl_netpacketloss.integer)
122                 for (i = 0;i < cl_numsockets;i++)
123                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
124                                 return length;
125         ret = LHNET_Write(mysocket, data, length, peeraddress);
126         if (developer_networking.integer)
127         {
128                 char addressstring[128], addressstring2[128];
129                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
130                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
131                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
132                 Com_HexDumpToConsole(data, length);
133         }
134         return ret;
135 }
136
137 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
138 {
139         // note this does not include the trailing NULL because we add that in the parser
140         return NetConn_Write(mysocket, string, strlen(string), peeraddress);
141 }
142
143 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
144 {
145         unsigned int packetLen;
146         unsigned int dataLen;
147         unsigned int eom;
148         unsigned int *header;
149
150 //#ifdef DEBUG
151         if (data->cursize == 0)
152                 Sys_Error("Datagram_SendMessage: zero length message\n");
153
154         if (data->cursize > (int)sizeof(conn->sendMessage))
155                 Sys_Error("Datagram_SendMessage: message too big (%u > %u)\n", data->cursize, sizeof(conn->sendMessage));
156
157         if (conn->canSend == false)
158                 Sys_Error("SendMessage: called with canSend == false\n");
159 //#endif
160
161         memcpy(conn->sendMessage, data->data, data->cursize);
162         conn->sendMessageLength = data->cursize;
163
164         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
165         {
166                 dataLen = conn->sendMessageLength;
167                 eom = NETFLAG_EOM;
168         }
169         else
170         {
171                 dataLen = MAX_PACKETFRAGMENT;
172                 eom = 0;
173         }
174
175         packetLen = NET_HEADERSIZE + dataLen;
176
177         header = (void *)sendbuffer;
178         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
179         header[1] = BigLong(conn->sendSequence);
180         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
181
182         conn->sendSequence++;
183         conn->canSend = false;
184
185         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
186                 return -1;
187
188         conn->lastSendTime = realtime;
189         packetsSent++;
190         reliableMessagesSent++;
191         return 1;
192 }
193
194 static void NetConn_SendMessageNext(netconn_t *conn)
195 {
196         unsigned int packetLen;
197         unsigned int dataLen;
198         unsigned int eom;
199         unsigned int *header;
200
201         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
202         {
203                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
204                 {
205                         dataLen = conn->sendMessageLength;
206                         eom = NETFLAG_EOM;
207                 }
208                 else
209                 {
210                         dataLen = MAX_PACKETFRAGMENT;
211                         eom = 0;
212                 }
213
214                 packetLen = NET_HEADERSIZE + dataLen;
215
216                 header = (void *)sendbuffer;
217                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
218                 header[1] = BigLong(conn->sendSequence);
219                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
220
221                 conn->sendSequence++;
222                 conn->sendNext = false;
223
224                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
225                         return;
226
227                 conn->lastSendTime = realtime;
228                 packetsSent++;
229         }
230 }
231
232 static void NetConn_ReSendMessage(netconn_t *conn)
233 {
234         unsigned int packetLen;
235         unsigned int dataLen;
236         unsigned int eom;
237         unsigned int *header;
238
239         if (conn->sendMessageLength && !conn->canSend && (realtime - conn->lastSendTime) > 1.0)
240         {
241                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
242                 {
243                         dataLen = conn->sendMessageLength;
244                         eom = NETFLAG_EOM;
245                 }
246                 else
247                 {
248                         dataLen = MAX_PACKETFRAGMENT;
249                         eom = 0;
250                 }
251
252                 packetLen = NET_HEADERSIZE + dataLen;
253
254                 header = (void *)sendbuffer;
255                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
256                 header[1] = BigLong(conn->sendSequence - 1);
257                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
258
259                 conn->sendNext = false;
260
261                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
262                         return;
263
264                 conn->lastSendTime = realtime;
265                 packetsReSent++;
266         }
267 }
268
269 qboolean NetConn_CanSendMessage(netconn_t *conn)
270 {
271         return conn->canSend;
272 }
273
274 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
275 {
276         int packetLen;
277         int *header;
278
279         packetLen = NET_HEADERSIZE + data->cursize;
280
281 //#ifdef DEBUG
282         if (data->cursize == 0)
283                 Sys_Error("Datagram_SendUnreliableMessage: zero length message\n");
284
285         if (packetLen > (int)sizeof(sendbuffer))
286                 Sys_Error("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
287 //#endif
288
289         header = (void *)sendbuffer;
290         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
291         header[1] = BigLong(conn->unreliableSendSequence);
292         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
293
294         conn->unreliableSendSequence++;
295
296         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
297                 return -1;
298
299         packetsSent++;
300         unreliableMessagesSent++;
301         return 1;
302 }
303
304 void NetConn_CloseClientPorts(void)
305 {
306         for (;cl_numsockets > 0;cl_numsockets--)
307                 if (cl_sockets[cl_numsockets - 1])
308                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
309 }
310
311 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
312 {
313         lhnetaddress_t address;
314         lhnetsocket_t *s;
315         char addressstring2[1024];
316         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
317         {
318                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
319                 {
320                         cl_sockets[cl_numsockets++] = s;
321                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
322                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
323                 }
324                 else
325                 {
326                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
327                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
328                 }
329         }
330         else
331                 Con_Printf("Client unable to parse address %s\n", addressstring);
332 }
333
334 void NetConn_OpenClientPorts(void)
335 {
336         int port;
337         NetConn_CloseClientPorts();
338         port = bound(0, cl_netport.integer, 65535);
339         if (cl_netport.integer != port)
340                 Cvar_SetValueQuick(&cl_netport, port);
341         Con_Printf("Client using port %i\n", port);
342         NetConn_OpenClientPort("local:2", 0);
343         NetConn_OpenClientPort(net_address.string, port);
344         //NetConn_OpenClientPort(net_address_ipv6.string, port);
345 }
346
347 void NetConn_CloseServerPorts(void)
348 {
349         for (;sv_numsockets > 0;sv_numsockets--)
350                 if (sv_sockets[sv_numsockets - 1])
351                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
352 }
353
354 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
355 {
356         lhnetaddress_t address;
357         lhnetsocket_t *s;
358         char addressstring2[1024];
359         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
360         {
361                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
362                 {
363                         sv_sockets[sv_numsockets++] = s;
364                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
365                         Con_Printf("Server listening on address %s\n", addressstring2);
366                 }
367                 else
368                 {
369                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
370                         Con_Printf("Server failed to open socket on address %s\n", addressstring2);
371                 }
372         }
373         else
374                 Con_Printf("Server unable to parse address %s\n", addressstring);
375 }
376
377 void NetConn_OpenServerPorts(int opennetports)
378 {
379         int port;
380         NetConn_CloseServerPorts();
381         port = bound(0, sv_netport.integer, 65535);
382         if (port == 0)
383                 port = 26000;
384         Con_Printf("Server using port %i\n", port);
385         if (sv_netport.integer != port)
386                 Cvar_SetValueQuick(&sv_netport, port);
387         if (cls.state != ca_dedicated)
388                 NetConn_OpenServerPort("local:1", 0);
389         if (opennetports)
390         {
391                 NetConn_OpenServerPort(net_address.string, port);
392                 //NetConn_OpenServerPort(net_address_ipv6.string, port);
393         }
394         if (sv_numsockets == 0)
395                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!\n");
396 }
397
398 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
399 {
400         int i, a = LHNETADDRESS_GetAddressType(address);
401         for (i = 0;i < cl_numsockets;i++)
402                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
403                         return cl_sockets[i];
404         return NULL;
405 }
406
407 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
408 {
409         int i, a = LHNETADDRESS_GetAddressType(address);
410         for (i = 0;i < sv_numsockets;i++)
411                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
412                         return sv_sockets[i];
413         return NULL;
414 }
415
416 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
417 {
418         netconn_t *conn;
419         conn = Mem_Alloc(netconn_mempool, sizeof(*conn));
420         conn->mysocket = mysocket;
421         conn->peeraddress = *peeraddress;
422         // updated by receiving "rate" command from client
423         conn->rate = NET_MINRATE;
424         // no limits for local player
425         if (LHNETADDRESS_GetAddressType(peeraddress) == LHNETADDRESSTYPE_LOOP)
426                 conn->rate = 1000000000;
427         conn->canSend = true;
428         conn->connecttime = realtime;
429         conn->lastMessageTime = realtime;
430         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
431         // reduce effectiveness of connection request floods
432         conn->timeout = realtime + net_connecttimeout.value;
433         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
434         conn->next = netconn_list;
435         netconn_list = conn;
436         return conn;
437 }
438
439 void NetConn_Close(netconn_t *conn)
440 {
441         netconn_t *c;
442         // remove connection from list
443         if (conn == netconn_list)
444                 netconn_list = conn->next;
445         else
446         {
447                 for (c = netconn_list;c;c = c->next)
448                 {
449                         if (c->next == conn)
450                         {
451                                 c->next = conn->next;
452                                 break;
453                         }
454                 }
455                 // not found in list, we'll avoid crashing here...
456                 if (!c)
457                         return;
458         }
459         // free connection
460         Mem_Free(conn);
461 }
462
463 static int clientport = -1;
464 static int clientport2 = -1;
465 static int hostport = -1;
466 static void NetConn_UpdateServerStuff(void)
467 {
468         if (cls.state != ca_dedicated)
469         {
470                 if (clientport2 != cl_netport.integer)
471                 {
472                         clientport2 = cl_netport.integer;
473                         if (cls.state == ca_connected)
474                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
475                 }
476                 if (cls.state == ca_disconnected && clientport != clientport2)
477                 {
478                         clientport = clientport2;
479                         NetConn_CloseClientPorts();
480                 }
481                 if (cl_numsockets == 0)
482                         NetConn_OpenClientPorts();
483         }
484
485         if (hostport != sv_netport.integer)
486         {
487                 hostport = sv_netport.integer;
488                 if (sv.active)
489                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
490         }
491 }
492
493 int NetConn_ReceivedMessage(netconn_t *conn, qbyte *data, int length)
494 {
495         unsigned int count;
496         unsigned int flags;
497         unsigned int sequence;
498
499         if (length >= 8)
500         {
501                 length = BigLong(((int *)data)[0]);
502                 flags = length & ~NETFLAG_LENGTH_MASK;
503                 length &= NETFLAG_LENGTH_MASK;
504                 // control packets were already handled
505                 if (!(flags & NETFLAG_CTL))
506                 {
507                         sequence = BigLong(((int *)data)[1]);
508                         packetsReceived++;
509                         data += 8;
510                         length -= 8;
511                         if (flags & NETFLAG_UNRELIABLE)
512                         {
513                                 if (sequence >= conn->unreliableReceiveSequence)
514                                 {
515                                         if (sequence > conn->unreliableReceiveSequence)
516                                         {
517                                                 count = sequence - conn->unreliableReceiveSequence;
518                                                 droppedDatagrams += count;
519                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
520                                         }
521                                         conn->unreliableReceiveSequence = sequence + 1;
522                                         conn->lastMessageTime = realtime;
523                                         conn->timeout = realtime + net_messagetimeout.value;
524                                         unreliableMessagesReceived++;
525                                         if (length > 0)
526                                         {
527                                                 SZ_Clear(&net_message);
528                                                 SZ_Write(&net_message, data, length);
529                                                 MSG_BeginReading();
530                                                 return 2;
531                                         }
532                                 }
533                                 else
534                                         Con_DPrint("Got a stale datagram\n");
535                                 return 1;
536                         }
537                         else if (flags & NETFLAG_ACK)
538                         {
539                                 if (sequence == (conn->sendSequence - 1))
540                                 {
541                                         if (sequence == conn->ackSequence)
542                                         {
543                                                 conn->ackSequence++;
544                                                 if (conn->ackSequence != conn->sendSequence)
545                                                         Con_DPrint("ack sequencing error\n");
546                                                 conn->lastMessageTime = realtime;
547                                                 conn->timeout = realtime + net_messagetimeout.value;
548                                                 conn->sendMessageLength -= MAX_PACKETFRAGMENT;
549                                                 if (conn->sendMessageLength > 0)
550                                                 {
551                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
552                                                         conn->sendNext = true;
553                                                         NetConn_SendMessageNext(conn);
554                                                 }
555                                                 else
556                                                 {
557                                                         conn->sendMessageLength = 0;
558                                                         conn->canSend = true;
559                                                 }
560                                         }
561                                         else
562                                                 Con_DPrint("Duplicate ACK received\n");
563                                 }
564                                 else
565                                         Con_DPrint("Stale ACK received\n");
566                                 return 1;
567                         }
568                         else if (flags & NETFLAG_DATA)
569                         {
570                                 unsigned int temppacket[2];
571                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
572                                 temppacket[1] = BigLong(sequence);
573                                 NetConn_Write(conn->mysocket, (qbyte *)temppacket, 8, &conn->peeraddress);
574                                 if (sequence == conn->receiveSequence)
575                                 {
576                                         conn->lastMessageTime = realtime;
577                                         conn->timeout = realtime + net_messagetimeout.value;
578                                         conn->receiveSequence++;
579                                         memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
580                                         conn->receiveMessageLength += length;
581                                         if (flags & NETFLAG_EOM)
582                                         {
583                                                 reliableMessagesReceived++;
584                                                 length = conn->receiveMessageLength;
585                                                 conn->receiveMessageLength = 0;
586                                                 if (length > 0)
587                                                 {
588                                                         SZ_Clear(&net_message);
589                                                         SZ_Write(&net_message, conn->receiveMessage, length);
590                                                         MSG_BeginReading();
591                                                         return 2;
592                                                 }
593                                         }
594                                 }
595                                 else
596                                         receivedDuplicateCount++;
597                                 return 1;
598                         }
599                 }
600         }
601         return 0;
602 }
603
604 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
605 {
606         cls.connect_trying = false;
607         // the connection request succeeded, stop current connection and set up a new connection
608         CL_Disconnect();
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.demonum = -1;                       // not in the demo loop now
614         cls.state = ca_connected;
615         cls.signon = 0;                         // need all the signon messages before playing
616         CL_ClearState();
617         SCR_BeginLoadingPlaque();
618 }
619
620 int NetConn_IsLocalGame(void)
621 {
622         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
623                 return true;
624         return false;
625 }
626
627 static struct
628 {
629         double senttime;
630         lhnetaddress_t peeraddress;
631 }
632 pingcache[HOSTCACHESIZE];
633
634 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
635 {
636         int ret, c, control;
637         lhnetaddress_t svaddress;
638         const char *s;
639         char *string, addressstring2[128], cname[128], ipstring[32];
640         char stringbuf[16384];
641
642         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
643         {
644                 // received a command string - strip off the packaging and put it
645                 // into our string buffer with NULL termination
646                 data += 4;
647                 length -= 4;
648                 length = min(length, (int)sizeof(stringbuf) - 1);
649                 memcpy(stringbuf, data, length);
650                 stringbuf[length] = 0;
651                 string = stringbuf;
652
653                 if (developer.integer)
654                 {
655                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
656                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
657                         Com_HexDumpToConsole(data, length);
658                 }
659
660                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
661                 {
662                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
663                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
664                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\challenge\\%s", string + 10), peeraddress);
665                         return true;
666                 }
667                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
668                 {
669                         NetConn_ConnectionEstablished(mysocket, peeraddress);
670                         return true;
671                 }
672                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
673                 {
674                         cls.connect_trying = false;
675                         string += 7;
676                         length = max(length - 7, (int)sizeof(m_return_reason) - 1);
677                         memcpy(m_return_reason, string, length);
678                         m_return_reason[length] = 0;
679                         Con_Printf("%s\n", m_return_reason);
680                         return true;
681                 }
682                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
683                 {
684                         int i, j, c, n, users, maxusers;
685                         char game[32], mod[32], map[32], name[128];
686                         double pingtime;
687                         hostcache_t temp;
688                         string += 13;
689                         // hostcache only uses text addresses
690                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
691                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(game, s, sizeof (game));else game[0] = 0;
692                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(mod , s, sizeof (mod ));else mod[0]  = 0;
693                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(map , s, sizeof (map ));else map[0]  = 0;
694                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(name, s, sizeof (name));else name[0] = 0;
695                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) c = atoi(s);else c = -1;
696                         if ((s = SearchInfostring(string, "clients"      )) != NULL) users = atoi(s);else users = 0;
697                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) maxusers = atoi(s);else maxusers = 0;
698                         // search the cache for this server and update it
699                         for (n = 0; n < hostCacheCount; n++)
700                         {
701                                 if (!strcmp(cname, hostcache[n].cname))
702                                 {
703                                         if (hostcache[n].ping == 100000)
704                                                 serverreplycount++;
705                                         pingtime = (int)((realtime - hostcache[n].querytime) * 1000.0);
706                                         pingtime = bound(0, pingtime, 9999);
707                                         // update the ping
708                                         hostcache[n].ping = pingtime;
709                                         // build description strings for the things users care about
710                                         snprintf(hostcache[n].line1, sizeof(hostcache[n].line1), "%5d%c%3u/%3u %-65.65s", (int)pingtime, c != NET_PROTOCOL_VERSION ? '*' : ' ', users, maxusers, name);
711                                         snprintf(hostcache[n].line2, sizeof(hostcache[n].line2), "%-21.21s %-19.19s %-17.17s %-20.20s", cname, game, mod, map);
712                                         // if ping is especially high, display it as such
713                                         if (pingtime >= 300)
714                                         {
715                                                 // orange numbers (lower block)
716                                                 for (i = 0;i < 5;i++)
717                                                         if (hostcache[n].line1[i] != ' ')
718                                                                 hostcache[n].line1[i] += 128;
719                                         }
720                                         else if (pingtime >= 200)
721                                         {
722                                                 // yellow numbers (in upper block)
723                                                 for (i = 0;i < 5;i++)
724                                                         if (hostcache[n].line1[i] != ' ')
725                                                                 hostcache[n].line1[i] -= 30;
726                                         }
727                                         // if not in the slist menu we should print the server to console
728                                         if (m_state != m_slist)
729                                                 Con_Printf("%s\n%s\n", hostcache[n].line1, hostcache[n].line2);
730                                         // and finally, re-sort the list
731                                         for (i = 0;i < hostCacheCount;i++)
732                                         {
733                                                 for (j = i + 1;j < hostCacheCount;j++)
734                                                 {
735                                                         //if (strcmp(hostcache[j].name, hostcache[i].name) < 0)
736                                                         if (hostcache[i].ping > hostcache[j].ping)
737                                                         {
738                                                                 memcpy(&temp, &hostcache[j], sizeof(hostcache_t));
739                                                                 memcpy(&hostcache[j], &hostcache[i], sizeof(hostcache_t));
740                                                                 memcpy(&hostcache[i], &temp, sizeof(hostcache_t));
741                                                         }
742                                                 }
743                                         }
744                                         break;
745                                 }
746                         }
747                         return true;
748                 }
749                 if (!strncmp(string, "getserversResponse\\", 19) && hostCacheCount < HOSTCACHESIZE)
750                 {
751                         int i, n, j;
752                         hostcache_t temp;
753                         // Extract the IP addresses
754                         data += 18;
755                         length -= 18;
756                         masterreplycount++;
757                         if (m_state != m_slist)
758                                 Con_Print("received server list...\n");
759                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
760                         {
761                                 snprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
762                                 if (developer.integer)
763                                         Con_Printf("Requesting info from server %s\n", ipstring);
764                                 LHNETADDRESS_FromString(&svaddress, ipstring, 0);
765                                 NetConn_WriteString(mysocket, "\377\377\377\377getinfo", &svaddress);
766
767
768                                 // add to slist (hostCache)
769                                 // search the cache for this server
770                                 for (n = 0; n < hostCacheCount; n++)
771                                         if (!strcmp(ipstring, hostcache[n].cname))
772                                                 break;
773                                 // add it or update it
774                                 if (n == hostCacheCount)
775                                 {
776                                         // if cache is full replace highest ping server (the list is
777                                         // kept sorted so this is always the last, and if this server
778                                         // is good it will be sorted into an early part of the list)
779                                         if (hostCacheCount >= HOSTCACHESIZE)
780                                                 n = hostCacheCount - 1;
781                                         else
782                                         {
783                                                 serverquerycount++;
784                                                 hostCacheCount++;
785                                         }
786                                 }
787                                 memset(&hostcache[n], 0, sizeof(hostcache[n]));
788                                 // store the data the engine cares about (address and ping)
789                                 strlcpy (hostcache[n].cname, ipstring, sizeof (hostcache[n].cname));
790                                 hostcache[n].ping = 100000;
791                                 hostcache[n].querytime = realtime;
792                                 // build description strings for the things users care about
793                                 strlcpy (hostcache[n].line1, "?", sizeof (hostcache[n].line1));
794                                 strlcpy (hostcache[n].line2, ipstring, sizeof (hostcache[n].line2));
795                                 // if not in the slist menu we should print the server to console
796                                 if (m_state != m_slist)
797                                         Con_Printf("querying %s\n", ipstring);
798                                 // and finally, re-sort the list
799                                 for (i = 0;i < hostCacheCount;i++)
800                                 {
801                                         for (j = i + 1;j < hostCacheCount;j++)
802                                         {
803                                                 //if (strcmp(hostcache[j].name, hostcache[i].name) < 0)
804                                                 if (hostcache[i].ping > hostcache[j].ping)
805                                                 {
806                                                         memcpy(&temp, &hostcache[j], sizeof(hostcache_t));
807                                                         memcpy(&hostcache[j], &hostcache[i], sizeof(hostcache_t));
808                                                         memcpy(&hostcache[i], &temp, sizeof(hostcache_t));
809                                                 }
810                                         }
811                                 }
812
813
814                                 // move on to next address in packet
815                                 data += 7;
816                                 length -= 7;
817                         }
818                         return true;
819                 }
820                 /*
821                 if (!strncmp(string, "ping", 4))
822                 {
823                         if (developer.integer)
824                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
825                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
826                         return true;
827                 }
828                 if (!strncmp(string, "ack", 3))
829                         return true;
830                 */
831                 // we may not have liked the packet, but it was a command packet, so
832                 // we're done processing this packet now
833                 return true;
834         }
835         // netquake control packets, supported for compatibility only
836         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
837         {
838                 c = data[4];
839                 data += 5;
840                 length -= 5;
841                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
842                 switch (c)
843                 {
844                 case CCREP_ACCEPT:
845                         if (developer.integer)
846                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
847                         if (cls.connect_trying)
848                         {
849                                 lhnetaddress_t clientportaddress;
850                                 clientportaddress = *peeraddress;
851                                 if (length >= 4)
852                                 {
853                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
854                                         data += 4;
855                                         length -= 4;
856                                         LHNETADDRESS_SetPort(&clientportaddress, port);
857                                 }
858                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress);
859                         }
860                         break;
861                 case CCREP_REJECT:
862                         if (developer.integer)
863                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
864                         Con_Printf("%s\n", data);
865                         strlcpy (m_return_reason, data, sizeof (m_return_reason));
866                         break;
867 #if 0
868                 case CCREP_SERVER_INFO:
869                         if (developer.integer)
870                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
871                         if (cls.state != ca_dedicated)
872                         {
873                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
874                                 // string we just ignore it and keep the real address
875                                 MSG_ReadString();
876                                 // hostcache only uses text addresses
877                                 cname = UDP_AddrToString(readaddr);
878                                 // search the cache for this server
879                                 for (n = 0; n < hostCacheCount; n++)
880                                         if (!strcmp(cname, hostcache[n].cname))
881                                                 break;
882                                 // add it
883                                 if (n == hostCacheCount && hostCacheCount < HOSTCACHESIZE)
884                                 {
885                                         hostCacheCount++;
886                                         memset(&hostcache[n], 0, sizeof(hostcache[n]));
887                                         strlcpy (hostcache[n].name, MSG_ReadString(), sizeof (hostcache[n].name));
888                                         strlcpy (hostcache[n].map, MSG_ReadString(), sizeof (hostcache[n].map));
889                                         hostcache[n].users = MSG_ReadByte();
890                                         hostcache[n].maxusers = MSG_ReadByte();
891                                         c = MSG_ReadByte();
892                                         if (c != NET_PROTOCOL_VERSION)
893                                         {
894                                                 strlcpy (hostcache[n].cname, hostcache[n].name, sizeof (hostcache[n].cname));
895                                                 strcpy(hostcache[n].name, "*");
896                                                 strlcat (hostcache[n].name, hostcache[n].cname, sizeof(hostcache[n].name));
897                                         }
898                                         strlcpy (hostcache[n].cname, cname, sizeof (hostcache[n].cname));
899                                 }
900                         }
901                         break;
902                 case CCREP_PLAYER_INFO:
903                         // we got a CCREP_PLAYER_INFO??
904                         //if (developer.integer)
905                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
906                         break;
907                 case CCREP_RULE_INFO:
908                         // we got a CCREP_RULE_INFO??
909                         //if (developer.integer)
910                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
911                         break;
912 #endif
913                 default:
914                         break;
915                 }
916                 // we may not have liked the packet, but it was a valid control
917                 // packet, so we're done processing this packet now
918                 return true;
919         }
920         ret = 0;
921         if (length >= (int)NET_HEADERSIZE && cls.netcon && mysocket == cls.netcon->mysocket && !LHNETADDRESS_Compare(&cls.netcon->peeraddress, peeraddress) && (ret = NetConn_ReceivedMessage(cls.netcon, data, length)) == 2)
922                 CL_ParseServerMessage();
923         return ret;
924 }
925
926 void NetConn_ClientFrame(void)
927 {
928         int i, length;
929         lhnetaddress_t peeraddress;
930         netconn_t *conn;
931         NetConn_UpdateServerStuff();
932         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
933         {
934                 if (cls.connect_remainingtries == 0)
935                 {
936                         cls.connect_trying = false;
937                         if (m_state == m_slist)
938                                 strcpy (m_return_reason, "Connect: Failed");
939                         else
940                                 Con_Print("Connect failed\n");
941                         return;
942                 }
943                 if (cls.connect_nextsendtime)
944                 {
945                         if (m_state == m_slist)
946                                 strcpy (m_return_reason, "Connect: Still trying");
947                         else
948                                 Con_Print("Still trying...\n");
949                 }
950                 else
951                 {
952                         if (m_state == m_slist)
953                                 strcpy (m_return_reason, "Connect: Trying");
954                         else
955                                 Con_Print("Trying...\n");
956                 }
957                 cls.connect_nextsendtime = realtime + 1;
958                 cls.connect_remainingtries--;
959                 // try challenge first (newer server)
960                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
961                 // then try netquake as a fallback (old server, or netquake)
962                 SZ_Clear(&net_message);
963                 // save space for the header, filled in later
964                 MSG_WriteLong(&net_message, 0);
965                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
966                 MSG_WriteString(&net_message, "QUAKE");
967                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
968                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
969                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
970                 SZ_Clear(&net_message);
971         }
972         for (i = 0;i < cl_numsockets;i++)
973                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
974                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
975         if (cls.netcon && realtime > cls.netcon->timeout)
976         {
977                 Con_Print("Connection timed out\n");
978                 CL_Disconnect();
979                 Host_ShutdownServer (false);
980         }
981         for (conn = netconn_list;conn;conn = conn->next)
982                 NetConn_ReSendMessage(conn);
983 }
984
985 #define MAX_CHALLENGES 128
986 struct
987 {
988         lhnetaddress_t address;
989         double time;
990         char string[12];
991 }
992 challenge[MAX_CHALLENGES];
993
994 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
995 {
996         int i;
997         char c;
998         for (i = 0;i < bufferlength - 1;i++)
999         {
1000                 do
1001                 {
1002                         c = rand () % (127 - 33) + 33;
1003                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
1004                 buffer[i] = c;
1005         }
1006         buffer[i] = 0;
1007 }
1008
1009 extern void SV_ConnectClient(int clientnum, netconn_t *netconnection);
1010 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
1011 {
1012         int i, n, ret, clientnum, responselength, best;
1013         double besttime;
1014         client_t *client;
1015         netconn_t *conn;
1016         char *s, *string, response[512], addressstring2[128], stringbuf[16384];
1017
1018         if (sv.active)
1019         {
1020                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1021                 {
1022                         // received a command string - strip off the packaging and put it
1023                         // into our string buffer with NULL termination
1024                         data += 4;
1025                         length -= 4;
1026                         length = min(length, (int)sizeof(stringbuf) - 1);
1027                         memcpy(stringbuf, data, length);
1028                         stringbuf[length] = 0;
1029                         string = stringbuf;
1030
1031                         if (developer.integer)
1032                         {
1033                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1034                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1035                                 Com_HexDumpToConsole(data, length);
1036                         }
1037
1038                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
1039                         {
1040                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1041                                 {
1042                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1043                                                 break;
1044                                         if (besttime > challenge[i].time)
1045                                                 besttime = challenge[best = i].time;
1046                                 }
1047                                 // if we did not find an exact match, choose the oldest and
1048                                 // update address and string
1049                                 if (i == MAX_CHALLENGES)
1050                                 {
1051                                         i = best;
1052                                         challenge[i].address = *peeraddress;
1053                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1054                                 }
1055                                 challenge[i].time = realtime;
1056                                 // send the challenge
1057                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1058                                 return true;
1059                         }
1060                         if (length > 8 && !memcmp(string, "connect\\", 8))
1061                         {
1062                                 string += 7;
1063                                 length -= 7;
1064                                 if ((s = SearchInfostring(string, "challenge")))
1065                                 {
1066                                         // validate the challenge
1067                                         for (i = 0;i < MAX_CHALLENGES;i++)
1068                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1069                                                         break;
1070                                         if (i < MAX_CHALLENGES)
1071                                         {
1072                                                 // check engine protocol
1073                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1074                                                 {
1075                                                         if (developer.integer)
1076                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1077                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1078                                                 }
1079                                                 else
1080                                                 {
1081                                                         // see if this is a duplicate connection request
1082                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1083                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1084                                                                         break;
1085                                                         if (clientnum < svs.maxclients)
1086                                                         {
1087                                                                 // duplicate connection request
1088                                                                 if (realtime - client->netconnection->connecttime < 2.0)
1089                                                                 {
1090                                                                         // client is still trying to connect,
1091                                                                         // so we send a duplicate reply
1092                                                                         if (developer.integer)
1093                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1094                                                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1095                                                                 }
1096                                                                 // only kick if old connection seems dead
1097                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1098                                                                 {
1099                                                                         // kick off connection and await retry
1100                                                                         client->deadsocket = true;
1101                                                                 }
1102                                                         }
1103                                                         else
1104                                                         {
1105                                                                 // this is a new client, find a slot
1106                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1107                                                                         if (!client->active)
1108                                                                                 break;
1109                                                                 if (clientnum < svs.maxclients)
1110                                                                 {
1111                                                                         // prepare the client struct
1112                                                                         if ((conn = NetConn_Open(mysocket, peeraddress)))
1113                                                                         {
1114                                                                                 // allocated connection
1115                                                                                 LHNETADDRESS_ToString(peeraddress, conn->address, sizeof(conn->address), true);
1116                                                                                 if (developer.integer)
1117                                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1118                                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1119                                                                                 // now set up the client
1120                                                                                 SV_ConnectClient(clientnum, conn);
1121                                                                                 NetConn_Heartbeat(1);
1122                                                                         }
1123                                                                 }
1124                                                                 else
1125                                                                 {
1126                                                                         // server is full
1127                                                                         if (developer.integer)
1128                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1129                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1130                                                                 }
1131                                                         }
1132                                                 }
1133                                         }
1134                                 }
1135                                 return true;
1136                         }
1137                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1138                         {
1139                                 const char *challenge = NULL;
1140                                 // If there was a challenge in the getinfo message
1141                                 if (length > 8 && string[7] == ' ')
1142                                         challenge = string + 8;
1143                                 for (i = 0, n = 0;i < svs.maxclients;i++)
1144                                         if (svs.clients[i].active)
1145                                                 n++;
1146                                 responselength = snprintf(response, sizeof(response), "\377\377\377\377infoResponse\x0A"
1147                                                         "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
1148                                                         "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d%s%s",
1149                                                         gamename, com_modname, svs.maxclients, n,
1150                                                         sv.name, hostname.string, NET_PROTOCOL_VERSION, challenge ? "\\challenge\\" : "", challenge ? challenge : "");
1151                                 // does it fit in the buffer?
1152                                 if (responselength < (int)sizeof(response))
1153                                 {
1154                                         if (developer.integer)
1155                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1156                                         NetConn_WriteString(mysocket, response, peeraddress);
1157                                 }
1158                                 return true;
1159                         }
1160                         /*
1161                         if (!strncmp(string, "ping", 4))
1162                         {
1163                                 if (developer.integer)
1164                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1165                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1166                                 return true;
1167                         }
1168                         if (!strncmp(string, "ack", 3))
1169                                 return true;
1170                         */
1171                         // we may not have liked the packet, but it was a command packet, so
1172                         // we're done processing this packet now
1173                         return true;
1174                 }
1175                 // LordHavoc: disabled netquake control packet support in server
1176 #if 0
1177                 {
1178                         int c, control;
1179                         // netquake control packets, supported for compatibility only
1180                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1181                         {
1182                                 c = data[4];
1183                                 data += 5;
1184                                 length -= 5;
1185                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1186                                 switch (c)
1187                                 {
1188                                 case CCREQ_CONNECT:
1189                                         //if (developer.integer)
1190                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1191                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
1192                                         {
1193                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1194                                                 {
1195                                                         if (developer.integer)
1196                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1197                                                         SZ_Clear(&net_message);
1198                                                         // save space for the header, filled in later
1199                                                         MSG_WriteLong(&net_message, 0);
1200                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1201                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
1202                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1203                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1204                                                         SZ_Clear(&net_message);
1205                                                 }
1206                                                 else
1207                                                 {
1208                                                         // see if this is a duplicate connection request
1209                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1210                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1211                                                                         break;
1212                                                         if (clientnum < svs.maxclients)
1213                                                         {
1214                                                                 // duplicate connection request
1215                                                                 if (realtime - client->netconnection->connecttime < 2.0)
1216                                                                 {
1217                                                                         // client is still trying to connect,
1218                                                                         // so we send a duplicate reply
1219                                                                         if (developer.integer)
1220                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1221                                                                         SZ_Clear(&net_message);
1222                                                                         // save space for the header, filled in later
1223                                                                         MSG_WriteLong(&net_message, 0);
1224                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1225                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1226                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1227                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1228                                                                         SZ_Clear(&net_message);
1229                                                                 }
1230                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1231                                                                 {
1232                                                                         // the old client hasn't sent us anything
1233                                                                         // in quite a while, so kick off and let
1234                                                                         // the retry take care of it...
1235                                                                         client->deadsocket = true;
1236                                                                 }
1237                                                         }
1238                                                         else
1239                                                         {
1240                                                                 // this is a new client, find a slot
1241                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1242                                                                         if (!client->active)
1243                                                                                 break;
1244                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
1245                                                                 {
1246                                                                         // connect to the client
1247                                                                         // everything is allocated, just fill in the details
1248                                                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
1249                                                                         if (developer.integer)
1250                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
1251                                                                         // send back the info about the server connection
1252                                                                         SZ_Clear(&net_message);
1253                                                                         // save space for the header, filled in later
1254                                                                         MSG_WriteLong(&net_message, 0);
1255                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1256                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
1257                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1258                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1259                                                                         SZ_Clear(&net_message);
1260                                                                         // now set up the client struct
1261                                                                         SV_ConnectClient(clientnum, conn);
1262                                                                         NetConn_Heartbeat(1);
1263                                                                 }
1264                                                                 else
1265                                                                 {
1266                                                                         //if (developer.integer)
1267                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
1268                                                                         // no room; try to let player know
1269                                                                         SZ_Clear(&net_message);
1270                                                                         // save space for the header, filled in later
1271                                                                         MSG_WriteLong(&net_message, 0);
1272                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1273                                                                         MSG_WriteString(&net_message, "Server is full.\n");
1274                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1275                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1276                                                                         SZ_Clear(&net_message);
1277                                                                 }
1278                                                         }
1279                                                 }
1280                                         }
1281                                         break;
1282 #if 0
1283                                 case CCREQ_SERVER_INFO:
1284                                         if (developer.integer)
1285                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
1286                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
1287                                         {
1288                                                 if (developer.integer)
1289                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
1290                                                 SZ_Clear(&net_message);
1291                                                 // save space for the header, filled in later
1292                                                 MSG_WriteLong(&net_message, 0);
1293                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1294                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1295                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1296                                                 MSG_WriteString(&net_message, hostname.string);
1297                                                 MSG_WriteString(&net_message, sv.name);
1298                                                 MSG_WriteByte(&net_message, net_activeconnections);
1299                                                 MSG_WriteByte(&net_message, svs.maxclients);
1300                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1301                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1302                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1303                                                 SZ_Clear(&net_message);
1304                                         }
1305                                         break;
1306                                 case CCREQ_PLAYER_INFO:
1307                                         if (developer.integer)
1308                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1309                                         if (sv.active)
1310                                         {
1311                                                 int playerNumber, activeNumber, clientNumber;
1312                                                 client_t *client;
1313
1314                                                 playerNumber = MSG_ReadByte();
1315                                                 activeNumber = -1;
1316                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1317                                                         if (client->active && ++activeNumber == playerNumber)
1318                                                                 break;
1319                                                 if (clientNumber != svs.maxclients)
1320                                                 {
1321                                                         SZ_Clear(&net_message);
1322                                                         // save space for the header, filled in later
1323                                                         MSG_WriteLong(&net_message, 0);
1324                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1325                                                         MSG_WriteByte(&net_message, playerNumber);
1326                                                         MSG_WriteString(&net_message, client->name);
1327                                                         MSG_WriteLong(&net_message, client->colors);
1328                                                         MSG_WriteLong(&net_message, (int)client->edict->v->frags);
1329                                                         MSG_WriteLong(&net_message, (int)(realtime - client->netconnection->connecttime));
1330                                                         MSG_WriteString(&net_message, client->netconnection->address);
1331                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1332                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1333                                                         SZ_Clear(&net_message);
1334                                                 }
1335                                         }
1336                                         break;
1337                                 case CCREQ_RULE_INFO:
1338                                         if (developer.integer)
1339                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1340                                         if (sv.active)
1341                                         {
1342                                                 char *prevCvarName;
1343                                                 cvar_t *var;
1344
1345                                                 // find the search start location
1346                                                 prevCvarName = MSG_ReadString();
1347                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1348
1349                                                 // send the response
1350                                                 SZ_Clear(&net_message);
1351                                                 // save space for the header, filled in later
1352                                                 MSG_WriteLong(&net_message, 0);
1353                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1354                                                 if (var)
1355                                                 {
1356                                                         MSG_WriteString(&net_message, var->name);
1357                                                         MSG_WriteString(&net_message, var->string);
1358                                                 }
1359                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1360                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1361                                                 SZ_Clear(&net_message);
1362                                         }
1363                                         break;
1364 #endif
1365                                 default:
1366                                         break;
1367                                 }
1368                                 // we may not have liked the packet, but it was a valid control
1369                                 // packet, so we're done processing this packet now
1370                                 return true;
1371                         }
1372                 }
1373 #endif
1374                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1375                 {
1376                         if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1377                         {
1378                                 sv_player = host_client->edict;
1379                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1380                                         SV_ReadClientMessage();
1381                                 return ret;
1382                         }
1383                 }
1384         }
1385         return 0;
1386 }
1387
1388 void NetConn_ServerFrame(void)
1389 {
1390         int i, length;
1391         lhnetaddress_t peeraddress;
1392         netconn_t *conn;
1393         NetConn_UpdateServerStuff();
1394         for (i = 0;i < sv_numsockets;i++)
1395                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1396                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1397         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1398         {
1399                 // never timeout loopback connections
1400                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(host_client->netconnection->mysocket)) != LHNETADDRESSTYPE_LOOP)
1401                 {
1402                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1403                         sv_player = host_client->edict;
1404                         SV_DropClient(false);
1405                 }
1406         }
1407         for (conn = netconn_list;conn;conn = conn->next)
1408                 NetConn_ReSendMessage(conn);
1409 }
1410
1411 void NetConn_QueryMasters(void)
1412 {
1413         int i;
1414         int masternum;
1415         lhnetaddress_t masteraddress;
1416         char request[256];
1417
1418         if (hostCacheCount >= HOSTCACHESIZE)
1419                 return;
1420
1421         for (i = 0;i < cl_numsockets;i++)
1422         {
1423                 if (cl_sockets[i])
1424                 {
1425 #if 0
1426                         // search LAN
1427 #if 1
1428                         UDP_Broadcast(UDP_controlSock, "\377\377\377\377getinfo", 11);
1429 #else
1430                         SZ_Clear(&net_message);
1431                         // save space for the header, filled in later
1432                         MSG_WriteLong(&net_message, 0);
1433                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1434                         MSG_WriteString(&net_message, "QUAKE");
1435                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1436                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1437                         UDP_Broadcast(UDP_controlSock, net_message.data, net_message.cursize);
1438                         SZ_Clear(&net_message);
1439 #endif
1440 #endif
1441
1442                         // build the getservers
1443                         snprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1444
1445                         // search internet
1446                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1447                         {
1448                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1449                                 {
1450                                         masterquerycount++;
1451                                         NetConn_WriteString(cl_sockets[i], request, &masteraddress);
1452                                 }
1453                         }
1454                 }
1455         }
1456         if (!masterquerycount)
1457         {
1458                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
1459                 strcpy(m_return_reason, "No network");
1460         }
1461 }
1462
1463 void NetConn_Heartbeat(int priority)
1464 {
1465         lhnetaddress_t masteraddress;
1466         int masternum;
1467         lhnetsocket_t *mysocket;
1468
1469         // if it's a state change (client connected), limit next heartbeat to no
1470         // more than 30 sec in the future
1471         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1472                 nextheartbeattime = realtime + 30.0;
1473
1474         // limit heartbeatperiod to 30 to 270 second range,
1475         // lower limit is to avoid abusing master servers with excess traffic,
1476         // upper limit is to avoid timing out on the master server (which uses
1477         // 300 sec timeout)
1478         if (sv_heartbeatperiod.value < 30)
1479                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1480         if (sv_heartbeatperiod.value > 270)
1481                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1482
1483         // make advertising optional and don't advertise singleplayer games, and
1484         // only send a heartbeat as often as the admin wants
1485         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1486         {
1487                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1488                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1489                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1490                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
1491         }
1492 }
1493
1494 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1495 {
1496         int i, count = 0;
1497         qbyte sent[MAX_SCOREBOARD];
1498
1499         memset(sent, 0, sizeof(sent));
1500
1501         // simultaneously wait for the first CanSendMessage and send the message,
1502         // then wait for a second CanSendMessage (verifying it was received), or
1503         // the client drops and is no longer counted
1504         // the loop aborts when either it runs out of clients to send to, or a
1505         // timeout expires
1506         blocktime += Sys_DoubleTime();
1507         do
1508         {
1509                 count = 0;
1510                 NetConn_ClientFrame();
1511                 NetConn_ServerFrame();
1512                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1513                 {
1514                         if (host_client->netconnection)
1515                         {
1516                                 if (NetConn_CanSendMessage(host_client->netconnection))
1517                                 {
1518                                         if (!sent[i])
1519                                                 NetConn_SendReliableMessage(host_client->netconnection, data);
1520                                         sent[i] = true;
1521                                 }
1522                                 if (!NetConn_CanSendMessage(host_client->netconnection))
1523                                         count++;
1524                         }
1525                 }
1526         }
1527         while (count && Sys_DoubleTime() < blocktime);
1528         return count;
1529 }
1530
1531 static void Net_Heartbeat_f(void)
1532 {
1533         if (sv.active)
1534                 NetConn_Heartbeat(2);
1535         else
1536                 Con_Print("No server running, can not heartbeat to master server.\n");
1537 }
1538
1539 void PrintStats(netconn_t *conn)
1540 {
1541         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1542 }
1543
1544 void Net_Stats_f(void)
1545 {
1546         netconn_t *conn;
1547         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1548         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1549         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1550         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1551         Con_Printf("packetsSent                = %i\n", packetsSent);
1552         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1553         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1554         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1555         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1556         Con_Print("connections                =\n");
1557         for (conn = netconn_list;conn;conn = conn->next)
1558                 PrintStats(conn);
1559 }
1560
1561 void Net_Slist_f(void)
1562 {
1563         masterquerytime = realtime;
1564         masterquerycount = 0;
1565         masterreplycount = 0;
1566         serverquerycount = 0;
1567         serverreplycount = 0;
1568         hostCacheCount = 0;
1569         memset(&pingcache, 0, sizeof(pingcache));
1570         if (m_state != m_slist)
1571                 Con_Print("Sending requests to master servers\n");
1572         NetConn_QueryMasters();
1573         if (m_state != m_slist)
1574                 Con_Print("Listening for replies...\n");
1575 }
1576
1577 void NetConn_Init(void)
1578 {
1579         int i;
1580         lhnetaddress_t tempaddress;
1581         netconn_mempool = Mem_AllocPool("Networking", 0, NULL);
1582         Cmd_AddCommand("net_stats", Net_Stats_f);
1583         Cmd_AddCommand("net_slist", Net_Slist_f);
1584         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
1585         Cvar_RegisterVariable(&net_messagetimeout);
1586         Cvar_RegisterVariable(&net_messagerejointimeout);
1587         Cvar_RegisterVariable(&net_connecttimeout);
1588         Cvar_RegisterVariable(&cl_netlocalping);
1589         Cvar_RegisterVariable(&cl_netpacketloss);
1590         Cvar_RegisterVariable(&hostname);
1591         Cvar_RegisterVariable(&developer_networking);
1592         Cvar_RegisterVariable(&cl_netport);
1593         Cvar_RegisterVariable(&sv_netport);
1594         Cvar_RegisterVariable(&net_address);
1595         //Cvar_RegisterVariable(&net_address_ipv6);
1596         Cvar_RegisterVariable(&sv_public);
1597         Cvar_RegisterVariable(&sv_heartbeatperiod);
1598         for (i = 0;sv_masters[i].name;i++)
1599                 Cvar_RegisterVariable(&sv_masters[i]);
1600 // COMMANDLINEOPTION: Server: -ip <ipaddress> sets the ip address of this machine for purposes of networking (default 0.0.0.0 also known as INADDR_ANY), use only if you have multiple network adapters and need to choose one specifically.
1601         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
1602         {
1603                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
1604                 {
1605                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
1606                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
1607                 }
1608                 else
1609                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
1610         }
1611 // COMMANDLINEOPTION: Server: -port <portnumber> sets the port to use for a server (default 26000, the same port as QUAKE itself), useful if you host multiple servers on your machine
1612         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
1613         {
1614                 i = atoi(com_argv[i + 1]);
1615                 if (i >= 0 && i < 65536)
1616                 {
1617                         Con_Printf("-port option used, setting port cvar to %i\n", i);
1618                         Cvar_SetValueQuick(&sv_netport, i);
1619                 }
1620                 else
1621                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
1622         }
1623         cl_numsockets = 0;
1624         sv_numsockets = 0;
1625         memset(&pingcache, 0, sizeof(pingcache));
1626         SZ_Alloc(&net_message, NET_MAXMESSAGE, "net_message");
1627         LHNET_Init();
1628 }
1629
1630 void NetConn_Shutdown(void)
1631 {
1632         NetConn_CloseClientPorts();
1633         NetConn_CloseServerPorts();
1634         LHNET_Shutdown();
1635 }
1636