-Fixed a possible buffer overflow bug in NetConn_ReceivedMessage (thanks Spike!)
[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", "1"};
29 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "120"};
30
31 // FIXME: resolve DNS on masters whenever their value changes and cache it (to avoid major delays in active servers when they heartbeat)
32 static cvar_t sv_masters [] =
33 {
34         {CVAR_SAVE, "sv_master1", ""},
35         {CVAR_SAVE, "sv_master2", ""},
36         {CVAR_SAVE, "sv_master3", ""},
37         {CVAR_SAVE, "sv_master4", ""},
38         {0, "sv_masterextra1", "ghdigital.com"}, //69.59.212.88
39         {0, "sv_masterextra2", "dpmaster.deathmask.net"}, //209.164.24.243
40         {0, "sv_masterextra3", "12.166.196.192"}, //blaze.mindphukd.org (doesn't resolve currently but works as an ip)
41         {0, NULL, NULL}
42 };
43
44 static double nextheartbeattime = 0;
45
46 sizebuf_t net_message;
47 static qbyte net_message_buf[NET_MAXMESSAGE];
48
49 cvar_t net_messagetimeout = {0, "net_messagetimeout","300"};
50 cvar_t net_messagerejointimeout = {0, "net_messagerejointimeout","10"};
51 cvar_t net_connecttimeout = {0, "net_connecttimeout","10"};
52 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED"};
53 cvar_t developer_networking = {0, "developer_networking", "0"};
54
55 cvar_t cl_netlocalping = {0, "cl_netlocalping","0"};
56 static cvar_t cl_netpacketloss = {0, "cl_netpacketloss","0"};
57
58
59 /* statistic counters */
60 static int packetsSent = 0;
61 static int packetsReSent = 0;
62 static int packetsReceived = 0;
63 static int receivedDuplicateCount = 0;
64 static int droppedDatagrams = 0;
65
66 static int unreliableMessagesSent = 0;
67 static int unreliableMessagesReceived = 0;
68 static int reliableMessagesSent = 0;
69 static int reliableMessagesReceived = 0;
70
71 double masterquerytime = -1000;
72 int masterquerycount = 0;
73 int masterreplycount = 0;
74 int serverquerycount = 0;
75 int serverreplycount = 0;
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 // ServerList interface
94 serverlist_mask_t serverlist_andmasks[SERVERLIST_ANDMASKCOUNT];
95 serverlist_mask_t serverlist_ormasks[SERVERLIST_ORMASKCOUNT];
96
97 serverlist_infofield_t serverlist_sortbyfield;
98 qboolean serverlist_sortdescending;
99
100 int serverlist_viewcount = 0;
101 serverlist_entry_t *serverlist_viewlist[SERVERLIST_VIEWLISTSIZE];
102
103 int serverlist_cachecount;
104 serverlist_entry_t serverlist_cache[SERVERLIST_TOTALSIZE];
105
106 qboolean serverlist_consoleoutput;
107
108 // helper function to insert a value into the viewset
109 // spare entries will be removed
110 static void _ServerList_ViewList_Helper_InsertBefore( int index, serverlist_entry_t *entry )
111 {
112     int i;
113         if( serverlist_viewcount == SERVERLIST_VIEWLISTSIZE )
114                 return;
115
116         for( i = serverlist_viewcount ; i > index ; i-- )
117                 serverlist_viewlist[ i ] = serverlist_viewlist[ i - 1 ];
118
119         serverlist_viewlist[index] = entry;
120         serverlist_viewcount++;
121 }
122
123 // we suppose serverlist_viewcount to be valid, ie > 0
124 static void _ServerList_ViewList_Helper_Remove( int index )
125 {
126         serverlist_viewcount--;
127         for( ; index < serverlist_viewcount ; index++ )
128                 serverlist_viewlist[index] = serverlist_viewlist[index + 1];
129 }
130
131 // returns true if A should be inserted before B
132 static qboolean _ServerList_Entry_Compare( serverlist_entry_t *A, serverlist_entry_t *B )
133 {
134         int result = 0; // > 0 if for numbers A > B and for text if A < B
135
136         switch( serverlist_sortbyfield ) {
137                 case SLIF_PING:
138                         result = A->info.ping - B->info.ping;
139                         break;
140                 case SLIF_MAXPLAYERS:
141                         result = A->info.maxplayers - B->info.maxplayers;
142                         break;
143                 case SLIF_NUMPLAYERS:
144                         result = A->info.numplayers - B->info.numplayers;
145                         break;
146                 case SLIF_PROTOCOL:
147                         result = A->info.protocol - B->info.protocol;
148                         break;
149                 case SLIF_CNAME:
150                         result = strcmp( B->info.cname, A->info.cname );
151                         break;
152                 case SLIF_GAME:
153                         result = strcmp( B->info.game, A->info.game );
154                         break;
155                 case SLIF_MAP:
156                         result = strcmp( B->info.map, A->info.map );
157                         break;
158                 case SLIF_MOD:
159                         result = strcmp( B->info.mod, A->info.mod );
160                         break;
161                 case SLIF_NAME:
162                         result = strcmp( B->info.name, A->info.name );
163                         break;
164                 default:
165                         Con_DPrint( "_ServerList_Entry_Compare: Bad serverlist_sortbyfield!\n" );
166                         break;
167         }
168
169         if( serverlist_sortdescending )
170                 return result > 0;
171         return result < 0;
172 }
173
174 static qboolean _ServerList_CompareInt( int A, serverlist_maskop_t op, int B )
175 {
176         // This should actually be done with some intermediate and end-of-function return
177         switch( op ) {
178                 case SLMO_LESS:
179                         return A < B;
180                 case SLMO_LESSEQUAL:
181                         return A <= B;
182                 case SLMO_EQUAL:
183                         return A == B;
184                 case SLMO_GREATER:
185                         return A > B;
186                 case SLMO_NOTEQUAL:
187                         return A != B;
188                 case SLMO_GREATEREQUAL:
189                 case SLMO_CONTAINS:
190                 case SLMO_NOTCONTAIN:
191                         return A >= B;
192                 default:
193                         Con_DPrint( "_ServerList_CompareInt: Bad op!\n" );
194                         return false;
195         }
196 }
197
198 static qboolean _ServerList_CompareStr( const char *A, serverlist_maskop_t op, const char *B )
199 {
200         // Same here, also using an intermediate & final return would be more appropriate
201         // A info B mask
202         switch( op ) {
203                 case SLMO_CONTAINS:
204                         return *B && !!strstr( A, B ); // we want a real bool
205                 case SLMO_NOTCONTAIN:
206                         return !*B || !strstr( A, B );
207                 case SLMO_LESS:
208                         return strcmp( A, B ) < 0;
209                 case SLMO_LESSEQUAL:
210                         return strcmp( A, B ) <= 0;
211                 case SLMO_EQUAL:
212                         return strcmp( A, B ) == 0;
213                 case SLMO_GREATER:
214                         return strcmp( A, B ) > 0;
215                 case SLMO_NOTEQUAL:
216                         return strcmp( A, B ) != 0;
217                 case SLMO_GREATEREQUAL:
218                         return strcmp( A, B ) >= 0;
219                 default:
220                         Con_DPrint( "_ServerList_CompareStr: Bad op!\n" );
221                         return false;
222         }
223 }
224
225 static qboolean _ServerList_Entry_Mask( serverlist_mask_t *mask, serverlist_info_t *info )
226 {
227         if( !_ServerList_CompareInt( info->ping, mask->tests[SLIF_PING], mask->info.ping ) )
228                 return false;
229         if( !_ServerList_CompareInt( info->maxplayers, mask->tests[SLIF_MAXPLAYERS], mask->info.maxplayers ) )
230                 return false;
231         if( !_ServerList_CompareInt( info->numplayers, mask->tests[SLIF_NUMPLAYERS], mask->info.numplayers ) )
232                 return false;
233         if( !_ServerList_CompareInt( info->protocol, mask->tests[SLIF_PROTOCOL], mask->info.protocol ))
234                 return false;
235         if( *mask->info.cname
236                 && !_ServerList_CompareStr( info->cname, mask->tests[SLIF_CNAME], mask->info.cname ) )
237                 return false;
238         if( *mask->info.game
239                 && !_ServerList_CompareStr( info->game, mask->tests[SLIF_GAME], mask->info.game ) )
240                 return false;
241         if( *mask->info.mod
242                 && !_ServerList_CompareStr( info->mod, mask->tests[SLIF_MOD], mask->info.mod ) )
243                 return false;
244         if( *mask->info.map
245                 && !_ServerList_CompareStr( info->map, mask->tests[SLIF_MAP], mask->info.map ) )
246                 return false;
247         if( *mask->info.name
248                 && !_ServerList_CompareStr( info->name, mask->tests[SLIF_NAME], mask->info.name ) )
249                 return false;
250         return true;
251 }
252
253 static void ServerList_ViewList_Insert( serverlist_entry_t *entry )
254 {
255         int start, end, mid;
256
257         if( serverlist_viewcount == SERVERLIST_VIEWLISTSIZE )
258                 return;
259
260         // now check whether it passes through the masks
261         for( start = 0 ; serverlist_andmasks[start].active && start < SERVERLIST_ANDMASKCOUNT ; start++ )
262                 if( !_ServerList_Entry_Mask( &serverlist_andmasks[start], &entry->info ) )
263                         return;
264
265         for( start = 0 ; serverlist_ormasks[start].active && start < SERVERLIST_ORMASKCOUNT ; start++ )
266                 if( _ServerList_Entry_Mask( &serverlist_ormasks[start], &entry->info ) )
267                         break;
268         if( start == SERVERLIST_ORMASKCOUNT || (start > 0 && !serverlist_ormasks[start].active) )
269                 return;
270
271         if( !serverlist_viewcount ) {
272                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
273                 return;
274         }
275         // ok, insert it, we just need to find out where exactly:
276
277         // two special cases
278         // check whether to insert it as new first item
279         if( _ServerList_Entry_Compare( entry, serverlist_viewlist[0] ) ) {
280                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
281                 return;
282         } // check whether to insert it as new last item
283         else if( !_ServerList_Entry_Compare( entry, serverlist_viewlist[serverlist_viewcount - 1] ) ) {
284                 _ServerList_ViewList_Helper_InsertBefore( serverlist_viewcount, entry );
285                 return;
286         }
287         start = 0;
288         end = serverlist_viewcount - 1;
289         while( end > start + 1 )
290         {
291                 mid = (start + end) / 2;
292                 // test the item that lies in the middle between start and end
293                 if( _ServerList_Entry_Compare( entry, serverlist_viewlist[mid] ) )
294                         // the item has to be in the upper half
295                         end = mid;
296                 else
297                         // the item has to be in the lower half
298                         start = mid;
299         }
300         _ServerList_ViewList_Helper_InsertBefore( start + 1, entry );
301 }
302
303 static void ServerList_ViewList_Remove( serverlist_entry_t *entry )
304 {
305         int i;
306         for( i = 0; i < serverlist_viewcount; i++ )
307         {
308                 if (serverlist_viewlist[i] == entry)
309                 {
310                         _ServerList_ViewList_Helper_Remove(i);
311                         break;
312                 }
313         }
314 }
315
316 void ServerList_RebuildViewList(void)
317 {
318         int i;
319
320         serverlist_viewcount = 0;
321         for( i = 0 ; i < serverlist_cachecount ; i++ )
322                 if( serverlist_cache[i].finished )
323                         ServerList_ViewList_Insert( &serverlist_cache[i] );
324 }
325
326 void ServerList_ResetMasks(void)
327 {
328         memset( &serverlist_andmasks, 0, sizeof( serverlist_andmasks ) );
329         memset( &serverlist_ormasks, 0, sizeof( serverlist_ormasks ) );
330 }
331
332 #if 0
333 static void _ServerList_Test(void)
334 {
335         int i;
336         for( i = 0 ; i < 1024 ; i++ ) {
337                 memset( &serverlist_cache[serverlist_cachecount], 0, sizeof( serverlist_entry_t ) );
338                 serverlist_cache[serverlist_cachecount].info.ping = rand() % 450 + 250;
339                 dpsnprintf( serverlist_cache[serverlist_cachecount].info.name, 128, "Black's ServerList Test %i", i );
340                 serverlist_cache[serverlist_cachecount].finished = true;
341                 sprintf( serverlist_cache[serverlist_cachecount].line1, "%i %s", serverlist_cache[serverlist_cachecount].info.ping, serverlist_cache[serverlist_cachecount].info.name );
342                 ServerList_ViewList_Insert( &serverlist_cache[serverlist_cachecount] );
343                 serverlist_cachecount++;
344         }
345 }
346 #endif
347
348 void ServerList_QueryList(void)
349 {
350         masterquerytime = realtime;
351         masterquerycount = 0;
352         masterreplycount = 0;
353         serverquerycount = 0;
354         serverreplycount = 0;
355         serverlist_cachecount = 0;
356         serverlist_viewcount = 0;
357         serverlist_consoleoutput = false;
358         NetConn_QueryMasters();
359
360         //_ServerList_Test();
361 }
362
363 // rest
364
365 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
366 {
367         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
368         int i;
369         if (length == 0)
370                 return 0;
371         if (cl_netpacketloss.integer)
372                 for (i = 0;i < cl_numsockets;i++)
373                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
374                                 return 0;
375         if (developer_networking.integer)
376         {
377                 char addressstring[128], addressstring2[128];
378                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
379                 if (length > 0)
380                 {
381                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
382                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
383                         Com_HexDumpToConsole(data, length);
384                 }
385                 else
386                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
387         }
388         return length;
389 }
390
391 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
392 {
393         int ret;
394         int i;
395         if (cl_netpacketloss.integer)
396                 for (i = 0;i < cl_numsockets;i++)
397                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
398                                 return length;
399         ret = LHNET_Write(mysocket, data, length, peeraddress);
400         if (developer_networking.integer)
401         {
402                 char addressstring[128], addressstring2[128];
403                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
404                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
405                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
406                 Com_HexDumpToConsole(data, length);
407         }
408         return ret;
409 }
410
411 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
412 {
413         // note this does not include the trailing NULL because we add that in the parser
414         return NetConn_Write(mysocket, string, strlen(string), peeraddress);
415 }
416
417 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
418 {
419         unsigned int packetLen;
420         unsigned int dataLen;
421         unsigned int eom;
422         unsigned int *header;
423
424 //#ifdef DEBUG
425         if (data->cursize == 0)
426                 Sys_Error("Datagram_SendMessage: zero length message\n");
427
428         if (data->cursize > (int)sizeof(conn->sendMessage))
429                 Sys_Error("Datagram_SendMessage: message too big (%u > %u)\n", data->cursize, sizeof(conn->sendMessage));
430
431         if (conn->canSend == false)
432                 Sys_Error("SendMessage: called with canSend == false\n");
433 //#endif
434
435         memcpy(conn->sendMessage, data->data, data->cursize);
436         conn->sendMessageLength = data->cursize;
437
438         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
439         {
440                 dataLen = conn->sendMessageLength;
441                 eom = NETFLAG_EOM;
442         }
443         else
444         {
445                 dataLen = MAX_PACKETFRAGMENT;
446                 eom = 0;
447         }
448
449         packetLen = NET_HEADERSIZE + dataLen;
450
451         header = (void *)sendbuffer;
452         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
453         header[1] = BigLong(conn->sendSequence);
454         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
455
456         conn->sendSequence++;
457         conn->canSend = false;
458
459         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
460                 return -1;
461
462         conn->lastSendTime = realtime;
463         packetsSent++;
464         reliableMessagesSent++;
465         return 1;
466 }
467
468 static void NetConn_SendMessageNext(netconn_t *conn)
469 {
470         unsigned int packetLen;
471         unsigned int dataLen;
472         unsigned int eom;
473         unsigned int *header;
474
475         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
476         {
477                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
478                 {
479                         dataLen = conn->sendMessageLength;
480                         eom = NETFLAG_EOM;
481                 }
482                 else
483                 {
484                         dataLen = MAX_PACKETFRAGMENT;
485                         eom = 0;
486                 }
487
488                 packetLen = NET_HEADERSIZE + dataLen;
489
490                 header = (void *)sendbuffer;
491                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
492                 header[1] = BigLong(conn->sendSequence);
493                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
494
495                 conn->sendSequence++;
496                 conn->sendNext = false;
497
498                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
499                         return;
500
501                 conn->lastSendTime = realtime;
502                 packetsSent++;
503         }
504 }
505
506 static void NetConn_ReSendMessage(netconn_t *conn)
507 {
508         unsigned int packetLen;
509         unsigned int dataLen;
510         unsigned int eom;
511         unsigned int *header;
512
513         if (conn->sendMessageLength && !conn->canSend && (realtime - conn->lastSendTime) > 1.0)
514         {
515                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
516                 {
517                         dataLen = conn->sendMessageLength;
518                         eom = NETFLAG_EOM;
519                 }
520                 else
521                 {
522                         dataLen = MAX_PACKETFRAGMENT;
523                         eom = 0;
524                 }
525
526                 packetLen = NET_HEADERSIZE + dataLen;
527
528                 header = (void *)sendbuffer;
529                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
530                 header[1] = BigLong(conn->sendSequence - 1);
531                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
532
533                 conn->sendNext = false;
534
535                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
536                         return;
537
538                 conn->lastSendTime = realtime;
539                 packetsReSent++;
540         }
541 }
542
543 qboolean NetConn_CanSendMessage(netconn_t *conn)
544 {
545         return conn->canSend;
546 }
547
548 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
549 {
550         int packetLen;
551         int *header;
552
553         packetLen = NET_HEADERSIZE + data->cursize;
554
555 //#ifdef DEBUG
556         if (data->cursize == 0)
557                 Sys_Error("Datagram_SendUnreliableMessage: zero length message\n");
558
559         if (packetLen > (int)sizeof(sendbuffer))
560                 Sys_Error("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
561 //#endif
562
563         header = (void *)sendbuffer;
564         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
565         header[1] = BigLong(conn->unreliableSendSequence);
566         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
567
568         conn->unreliableSendSequence++;
569
570         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
571                 return -1;
572
573         packetsSent++;
574         unreliableMessagesSent++;
575         return 1;
576 }
577
578 void NetConn_CloseClientPorts(void)
579 {
580         for (;cl_numsockets > 0;cl_numsockets--)
581                 if (cl_sockets[cl_numsockets - 1])
582                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
583 }
584
585 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
586 {
587         lhnetaddress_t address;
588         lhnetsocket_t *s;
589         char addressstring2[1024];
590         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
591         {
592                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
593                 {
594                         cl_sockets[cl_numsockets++] = s;
595                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
596                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
597                 }
598                 else
599                 {
600                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
601                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
602                 }
603         }
604         else
605                 Con_Printf("Client unable to parse address %s\n", addressstring);
606 }
607
608 void NetConn_OpenClientPorts(void)
609 {
610         int port;
611         NetConn_CloseClientPorts();
612         port = bound(0, cl_netport.integer, 65535);
613         if (cl_netport.integer != port)
614                 Cvar_SetValueQuick(&cl_netport, port);
615         Con_Printf("Client using port %i\n", port);
616         NetConn_OpenClientPort("local:2", 0);
617         NetConn_OpenClientPort(net_address.string, port);
618         //NetConn_OpenClientPort(net_address_ipv6.string, port);
619 }
620
621 void NetConn_CloseServerPorts(void)
622 {
623         for (;sv_numsockets > 0;sv_numsockets--)
624                 if (sv_sockets[sv_numsockets - 1])
625                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
626 }
627
628 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
629 {
630         lhnetaddress_t address;
631         lhnetsocket_t *s;
632         char addressstring2[1024];
633         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
634         {
635                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
636                 {
637                         sv_sockets[sv_numsockets++] = s;
638                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
639                         Con_Printf("Server listening on address %s\n", addressstring2);
640                 }
641                 else
642                 {
643                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
644                         Con_Printf("Server failed to open socket on address %s\n", addressstring2);
645                 }
646         }
647         else
648                 Con_Printf("Server unable to parse address %s\n", addressstring);
649 }
650
651 void NetConn_OpenServerPorts(int opennetports)
652 {
653         int port;
654         NetConn_CloseServerPorts();
655         port = bound(0, sv_netport.integer, 65535);
656         if (port == 0)
657                 port = 26000;
658         Con_Printf("Server using port %i\n", port);
659         if (sv_netport.integer != port)
660                 Cvar_SetValueQuick(&sv_netport, port);
661         if (cls.state != ca_dedicated)
662                 NetConn_OpenServerPort("local:1", 0);
663         if (opennetports)
664         {
665                 NetConn_OpenServerPort(net_address.string, port);
666                 //NetConn_OpenServerPort(net_address_ipv6.string, port);
667         }
668         if (sv_numsockets == 0)
669                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!\n");
670 }
671
672 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
673 {
674         int i, a = LHNETADDRESS_GetAddressType(address);
675         for (i = 0;i < cl_numsockets;i++)
676                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
677                         return cl_sockets[i];
678         return NULL;
679 }
680
681 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
682 {
683         int i, a = LHNETADDRESS_GetAddressType(address);
684         for (i = 0;i < sv_numsockets;i++)
685                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
686                         return sv_sockets[i];
687         return NULL;
688 }
689
690 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
691 {
692         netconn_t *conn;
693         conn = Mem_Alloc(netconn_mempool, sizeof(*conn));
694         conn->mysocket = mysocket;
695         conn->peeraddress = *peeraddress;
696         conn->canSend = true;
697         conn->lastMessageTime = realtime;
698         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
699         // reduce effectiveness of connection request floods
700         conn->timeout = realtime + net_connecttimeout.value;
701         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
702         conn->next = netconn_list;
703         netconn_list = conn;
704         return conn;
705 }
706
707 void NetConn_Close(netconn_t *conn)
708 {
709         netconn_t *c;
710         // remove connection from list
711         if (conn == netconn_list)
712                 netconn_list = conn->next;
713         else
714         {
715                 for (c = netconn_list;c;c = c->next)
716                 {
717                         if (c->next == conn)
718                         {
719                                 c->next = conn->next;
720                                 break;
721                         }
722                 }
723                 // not found in list, we'll avoid crashing here...
724                 if (!c)
725                         return;
726         }
727         // free connection
728         Mem_Free(conn);
729 }
730
731 static int clientport = -1;
732 static int clientport2 = -1;
733 static int hostport = -1;
734 static void NetConn_UpdateServerStuff(void)
735 {
736         if (cls.state != ca_dedicated)
737         {
738                 if (clientport2 != cl_netport.integer)
739                 {
740                         clientport2 = cl_netport.integer;
741                         if (cls.state == ca_connected)
742                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
743                 }
744                 if (cls.state == ca_disconnected && clientport != clientport2)
745                 {
746                         clientport = clientport2;
747                         NetConn_CloseClientPorts();
748                 }
749                 if (cl_numsockets == 0)
750                         NetConn_OpenClientPorts();
751         }
752
753         if (hostport != sv_netport.integer)
754         {
755                 hostport = sv_netport.integer;
756                 if (sv.active)
757                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
758         }
759 }
760
761 int NetConn_ReceivedMessage(netconn_t *conn, qbyte *data, int length)
762 {
763         unsigned int count;
764         unsigned int flags;
765         unsigned int sequence;
766
767         if (length >= 8)
768         {
769                 length = BigLong(((int *)data)[0]);
770                 flags = length & ~NETFLAG_LENGTH_MASK;
771                 length &= NETFLAG_LENGTH_MASK;
772                 // control packets were already handled
773                 if (!(flags & NETFLAG_CTL))
774                 {
775                         sequence = BigLong(((int *)data)[1]);
776                         packetsReceived++;
777                         data += 8;
778                         length -= 8;
779                         if (flags & NETFLAG_UNRELIABLE)
780                         {
781                                 if (sequence >= conn->unreliableReceiveSequence)
782                                 {
783                                         if (sequence > conn->unreliableReceiveSequence)
784                                         {
785                                                 count = sequence - conn->unreliableReceiveSequence;
786                                                 droppedDatagrams += count;
787                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
788                                         }
789                                         conn->unreliableReceiveSequence = sequence + 1;
790                                         conn->lastMessageTime = realtime;
791                                         conn->timeout = realtime + net_messagetimeout.value;
792                                         unreliableMessagesReceived++;
793                                         if (length > 0)
794                                         {
795                                                 SZ_Clear(&net_message);
796                                                 SZ_Write(&net_message, data, length);
797                                                 MSG_BeginReading();
798                                                 return 2;
799                                         }
800                                 }
801                                 else
802                                         Con_DPrint("Got a stale datagram\n");
803                                 return 1;
804                         }
805                         else if (flags & NETFLAG_ACK)
806                         {
807                                 if (sequence == (conn->sendSequence - 1))
808                                 {
809                                         if (sequence == conn->ackSequence)
810                                         {
811                                                 conn->ackSequence++;
812                                                 if (conn->ackSequence != conn->sendSequence)
813                                                         Con_DPrint("ack sequencing error\n");
814                                                 conn->lastMessageTime = realtime;
815                                                 conn->timeout = realtime + net_messagetimeout.value;
816                                                 conn->sendMessageLength -= MAX_PACKETFRAGMENT;
817                                                 if (conn->sendMessageLength > 0)
818                                                 {
819                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
820                                                         conn->sendNext = true;
821                                                         NetConn_SendMessageNext(conn);
822                                                 }
823                                                 else
824                                                 {
825                                                         conn->sendMessageLength = 0;
826                                                         conn->canSend = true;
827                                                 }
828                                         }
829                                         else
830                                                 Con_DPrint("Duplicate ACK received\n");
831                                 }
832                                 else
833                                         Con_DPrint("Stale ACK received\n");
834                                 return 1;
835                         }
836                         else if (flags & NETFLAG_DATA)
837                         {
838                                 unsigned int temppacket[2];
839                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
840                                 temppacket[1] = BigLong(sequence);
841                                 NetConn_Write(conn->mysocket, (qbyte *)temppacket, 8, &conn->peeraddress);
842                                 if (sequence == conn->receiveSequence)
843                                 {
844                                         conn->lastMessageTime = realtime;
845                                         conn->timeout = realtime + net_messagetimeout.value;
846                                         conn->receiveSequence++;
847                                         if( conn->receiveMessageLength + length <= sizeof( conn->receiveMessage ) ) {
848                                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
849                                                 conn->receiveMessageLength += length;
850                                         } else {
851                                                 Con_Printf( "Reliable message (seq: %i) too big for message buffer!\n"
852                                                                         "Dropping the message!\n", sequence );
853                                                 conn->receiveMessageLength = 0;
854                                                 return 1;
855                                         } 
856                                         if (flags & NETFLAG_EOM)
857                                         {
858                                                 reliableMessagesReceived++;
859                                                 length = conn->receiveMessageLength;
860                                                 conn->receiveMessageLength = 0;
861                                                 if (length > 0)
862                                                 {
863                                                         SZ_Clear(&net_message);
864                                                         SZ_Write(&net_message, conn->receiveMessage, length);
865                                                         MSG_BeginReading();
866                                                         return 2;
867                                                 }
868                                         }
869                                 }
870                                 else
871                                         receivedDuplicateCount++;
872                                 return 1;
873                         }
874                 }
875         }
876         return 0;
877 }
878
879 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
880 {
881         cls.connect_trying = false;
882         M_Update_Return_Reason("");
883         // the connection request succeeded, stop current connection and set up a new connection
884         CL_Disconnect();
885         cls.netcon = NetConn_Open(mysocket, peeraddress);
886         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
887         key_dest = key_game;
888         m_state = m_none;
889         cls.demonum = -1;                       // not in the demo loop now
890         cls.state = ca_connected;
891         cls.signon = 0;                         // need all the signon messages before playing
892 }
893
894 int NetConn_IsLocalGame(void)
895 {
896         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
897                 return true;
898         return false;
899 }
900
901 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
902 {
903         int ret, c, control;
904         lhnetaddress_t svaddress;
905         const char *s;
906         char *string, addressstring2[128], cname[128], ipstring[32];
907         char stringbuf[16384];
908
909         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
910         {
911                 // received a command string - strip off the packaging and put it
912                 // into our string buffer with NULL termination
913                 data += 4;
914                 length -= 4;
915                 length = min(length, (int)sizeof(stringbuf) - 1);
916                 memcpy(stringbuf, data, length);
917                 stringbuf[length] = 0;
918                 string = stringbuf;
919
920                 if (developer.integer)
921                 {
922                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
923                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
924                         Com_HexDumpToConsole(data, length);
925                 }
926
927                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
928                 {
929                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
930                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
931                         M_Update_Return_Reason("Got challenge response");
932                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\challenge\\%s", string + 10), peeraddress);
933                         return true;
934                 }
935                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
936                 {
937                         M_Update_Return_Reason("Accepted");
938                         NetConn_ConnectionEstablished(mysocket, peeraddress);
939                         return true;
940                 }
941                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
942                 {
943                         char rejectreason[32];
944                         cls.connect_trying = false;
945                         string += 7;
946                         length = max(length - 7, (int)sizeof(rejectreason) - 1);
947                         memcpy(rejectreason, string, length);
948                         rejectreason[length] = 0;
949                         M_Update_Return_Reason(rejectreason);
950                         return true;
951                 }
952                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
953                 {
954                         serverlist_info_t *info;
955                         int i, n;
956                         double pingtime;
957
958                         string += 13;
959                         // serverlist only uses text addresses
960                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
961                         // search the cache for this server and update it
962                         for( n = 0; n < serverlist_cachecount; n++ )
963                                 if( !strcmp( cname, serverlist_cache[n].info.cname ) )
964                                         break;
965                         if( n == serverlist_cachecount )
966                                 return true;
967
968                         info = &serverlist_cache[n].info;
969                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));else info->game[0] = 0;
970                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
971                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
972                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
973                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);else info->protocol = -1;
974                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);else info->numplayers = 0;
975                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
976
977                         if (info->ping == 100000)
978                                         serverreplycount++;
979
980                         pingtime = (int)((realtime - serverlist_cache[n].querytime) * 1000.0);
981                         pingtime = bound(0, pingtime, 9999);
982                         // update the ping
983                         info->ping = pingtime;
984
985                         // legacy/old stuff move it to the menu ASAP
986
987                         // build description strings for the things users care about
988                         dpsnprintf(serverlist_cache[n].line1, sizeof(serverlist_cache[n].line1), "%5d%c%3u/%3u %-65.65s", (int)pingtime, info->protocol != NET_PROTOCOL_VERSION ? '*' : ' ', info->numplayers, info->maxplayers, info->name);
989                         dpsnprintf(serverlist_cache[n].line2, sizeof(serverlist_cache[n].line2), "%-21.21s %-19.19s %-17.17s %-20.20s", info->cname, info->game, info->mod, info->map);
990                         // if ping is especially high, display it as such
991                         if (pingtime >= 300)
992                         {
993                                 // orange numbers (lower block)
994                                 for (i = 0;i < 5;i++)
995                                         if (serverlist_cache[n].line1[i] != ' ')
996                                                 serverlist_cache[n].line1[i] += 128;
997                         }
998                         else if (pingtime >= 200)
999                         {
1000                                 // yellow numbers (in upper block)
1001                                 for (i = 0;i < 5;i++)
1002                                         if (serverlist_cache[n].line1[i] != ' ')
1003                                                 serverlist_cache[n].line1[i] -= 30;
1004                         }
1005                         // and finally, update the view set
1006                         if( serverlist_cache[n].finished )
1007                 ServerList_ViewList_Remove( &serverlist_cache[n] );
1008                         // else if not in the slist menu we should print the server to console (if wanted)
1009                         else if( serverlist_consoleoutput )
1010                                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1011                         ServerList_ViewList_Insert( &serverlist_cache[n] );
1012                         serverlist_cache[n].finished = true;
1013
1014                         return true;
1015                 }
1016                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1017                 {
1018                         // Extract the IP addresses
1019                         data += 18;
1020                         length -= 18;
1021                         masterreplycount++;
1022                         if (serverlist_consoleoutput)
1023                                 Con_Print("received server list...\n");
1024                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
1025                         {
1026                                 int n;
1027
1028                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
1029                                 if (developer.integer)
1030                                         Con_Printf("Requesting info from server %s\n", ipstring);
1031                                 // ignore the rest of the message if the serverlist is full
1032                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1033                                         break;
1034                                 // also ignore it if we have already queried it (other master server response)
1035                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1036                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1037                                                 break;
1038                                 if( n >= serverlist_cachecount )
1039                                 {
1040                                         serverquerycount++;
1041
1042                                         LHNETADDRESS_FromString(&svaddress, ipstring, 0);
1043                                         NetConn_WriteString(mysocket, "\377\377\377\377getinfo", &svaddress);
1044
1045                                         memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1046                                         // store the data the engine cares about (address and ping)
1047                                         strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1048                                         serverlist_cache[serverlist_cachecount].info.ping = 100000;
1049                                         serverlist_cache[serverlist_cachecount].querytime = realtime;
1050                                         // if not in the slist menu we should print the server to console
1051                                         if (serverlist_consoleoutput)
1052                                                 Con_Printf("querying %s\n", ipstring);
1053
1054                                         ++serverlist_cachecount;
1055                                 }
1056
1057                                 // move on to next address in packet
1058                                 data += 7;
1059                                 length -= 7;
1060                         }
1061                         return true;
1062                 }
1063                 /*
1064                 if (!strncmp(string, "ping", 4))
1065                 {
1066                         if (developer.integer)
1067                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1068                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1069                         return true;
1070                 }
1071                 if (!strncmp(string, "ack", 3))
1072                         return true;
1073                 */
1074                 // we may not have liked the packet, but it was a command packet, so
1075                 // we're done processing this packet now
1076                 return true;
1077         }
1078         // netquake control packets, supported for compatibility only
1079         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1080         {
1081                 c = data[4];
1082                 data += 5;
1083                 length -= 5;
1084                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1085                 switch (c)
1086                 {
1087                 case CCREP_ACCEPT:
1088                         if (developer.integer)
1089                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
1090                         if (cls.connect_trying)
1091                         {
1092                                 lhnetaddress_t clientportaddress;
1093                                 clientportaddress = *peeraddress;
1094                                 if (length >= 4)
1095                                 {
1096                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
1097                                         data += 4;
1098                                         length -= 4;
1099                                         LHNETADDRESS_SetPort(&clientportaddress, port);
1100                                 }
1101                                 M_Update_Return_Reason("Accepted");
1102                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress);
1103                         }
1104                         break;
1105                 case CCREP_REJECT:
1106                         if (developer.integer)
1107                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1108                         cls.connect_trying = false;
1109                         M_Update_Return_Reason(data);
1110                         break;
1111 #if 0
1112                 case CCREP_SERVER_INFO:
1113                         if (developer.integer)
1114                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1115                         if (cls.state != ca_dedicated)
1116                         {
1117                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
1118                                 // string we just ignore it and keep the real address
1119                                 MSG_ReadString();
1120                                 // serverlist only uses text addresses
1121                                 cname = UDP_AddrToString(readaddr);
1122                                 // search the cache for this server
1123                                 for (n = 0; n < hostCacheCount; n++)
1124                                         if (!strcmp(cname, serverlist[n].cname))
1125                                                 break;
1126                                 // add it
1127                                 if (n == hostCacheCount && hostCacheCount < SERVERLISTSIZE)
1128                                 {
1129                                         hostCacheCount++;
1130                                         memset(&serverlist[n], 0, sizeof(serverlist[n]));
1131                                         strlcpy (serverlist[n].name, MSG_ReadString(), sizeof (serverlist[n].name));
1132                                         strlcpy (serverlist[n].map, MSG_ReadString(), sizeof (serverlist[n].map));
1133                                         serverlist[n].users = MSG_ReadByte();
1134                                         serverlist[n].maxusers = MSG_ReadByte();
1135                                         c = MSG_ReadByte();
1136                                         if (c != NET_PROTOCOL_VERSION)
1137                                         {
1138                                                 strlcpy (serverlist[n].cname, serverlist[n].name, sizeof (serverlist[n].cname));
1139                                                 strcpy(serverlist[n].name, "*");
1140                                                 strlcat (serverlist[n].name, serverlist[n].cname, sizeof(serverlist[n].name));
1141                                         }
1142                                         strlcpy (serverlist[n].cname, cname, sizeof (serverlist[n].cname));
1143                                 }
1144                         }
1145                         break;
1146                 case CCREP_PLAYER_INFO:
1147                         // we got a CCREP_PLAYER_INFO??
1148                         //if (developer.integer)
1149                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1150                         break;
1151                 case CCREP_RULE_INFO:
1152                         // we got a CCREP_RULE_INFO??
1153                         //if (developer.integer)
1154                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1155                         break;
1156 #endif
1157                 default:
1158                         break;
1159                 }
1160                 // we may not have liked the packet, but it was a valid control
1161                 // packet, so we're done processing this packet now
1162                 return true;
1163         }
1164         ret = 0;
1165         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)
1166                 CL_ParseServerMessage();
1167         return ret;
1168 }
1169
1170 void NetConn_ClientFrame(void)
1171 {
1172         int i, length;
1173         lhnetaddress_t peeraddress;
1174         netconn_t *conn;
1175         NetConn_UpdateServerStuff();
1176         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
1177         {
1178                 if (cls.connect_remainingtries == 0)
1179                         M_Update_Return_Reason("Connect: Waiting 10 seconds for reply");
1180                 cls.connect_nextsendtime = realtime + 1;
1181                 cls.connect_remainingtries--;
1182                 if (cls.connect_remainingtries <= -10)
1183                 {
1184                         cls.connect_trying = false;
1185                         M_Update_Return_Reason("Connect: Failed");
1186                         return;
1187                 }
1188                 // try challenge first (newer server)
1189                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
1190                 // then try netquake as a fallback (old server, or netquake)
1191                 SZ_Clear(&net_message);
1192                 // save space for the header, filled in later
1193                 MSG_WriteLong(&net_message, 0);
1194                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
1195                 MSG_WriteString(&net_message, "QUAKE");
1196                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1197                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1198                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
1199                 SZ_Clear(&net_message);
1200         }
1201         for (i = 0;i < cl_numsockets;i++)
1202                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1203                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
1204         if (cls.netcon && realtime > cls.netcon->timeout)
1205         {
1206                 Con_Print("Connection timed out\n");
1207                 CL_Disconnect();
1208                 Host_ShutdownServer (false);
1209         }
1210         for (conn = netconn_list;conn;conn = conn->next)
1211                 NetConn_ReSendMessage(conn);
1212 }
1213
1214 #define MAX_CHALLENGES 128
1215 struct
1216 {
1217         lhnetaddress_t address;
1218         double time;
1219         char string[12];
1220 }
1221 challenge[MAX_CHALLENGES];
1222
1223 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
1224 {
1225         int i;
1226         char c;
1227         for (i = 0;i < bufferlength - 1;i++)
1228         {
1229                 do
1230                 {
1231                         c = rand () % (127 - 33) + 33;
1232                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
1233                 buffer[i] = c;
1234         }
1235         buffer[i] = 0;
1236 }
1237
1238 extern void SV_SendServerinfo (client_t *client);
1239 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, qbyte *data, int length, lhnetaddress_t *peeraddress)
1240 {
1241         int i, n, ret, clientnum, responselength, best;
1242         double besttime;
1243         client_t *client;
1244         netconn_t *conn;
1245         char *s, *string, response[512], addressstring2[128], stringbuf[16384];
1246
1247         if (sv.active)
1248         {
1249                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1250                 {
1251                         // received a command string - strip off the packaging and put it
1252                         // into our string buffer with NULL termination
1253                         data += 4;
1254                         length -= 4;
1255                         length = min(length, (int)sizeof(stringbuf) - 1);
1256                         memcpy(stringbuf, data, length);
1257                         stringbuf[length] = 0;
1258                         string = stringbuf;
1259
1260                         if (developer.integer)
1261                         {
1262                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1263                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1264                                 Com_HexDumpToConsole(data, length);
1265                         }
1266
1267                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
1268                         {
1269                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1270                                 {
1271                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1272                                                 break;
1273                                         if (besttime > challenge[i].time)
1274                                                 besttime = challenge[best = i].time;
1275                                 }
1276                                 // if we did not find an exact match, choose the oldest and
1277                                 // update address and string
1278                                 if (i == MAX_CHALLENGES)
1279                                 {
1280                                         i = best;
1281                                         challenge[i].address = *peeraddress;
1282                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1283                                 }
1284                                 challenge[i].time = realtime;
1285                                 // send the challenge
1286                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1287                                 return true;
1288                         }
1289                         if (length > 8 && !memcmp(string, "connect\\", 8))
1290                         {
1291                                 string += 7;
1292                                 length -= 7;
1293                                 if ((s = SearchInfostring(string, "challenge")))
1294                                 {
1295                                         // validate the challenge
1296                                         for (i = 0;i < MAX_CHALLENGES;i++)
1297                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1298                                                         break;
1299                                         if (i < MAX_CHALLENGES)
1300                                         {
1301                                                 // check engine protocol
1302                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1303                                                 {
1304                                                         if (developer.integer)
1305                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1306                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1307                                                 }
1308                                                 else
1309                                                 {
1310                                                         // see if this is a duplicate connection request
1311                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1312                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1313                                                                         break;
1314                                                         if (clientnum < svs.maxclients && realtime - client->connecttime < net_messagerejointimeout.value)
1315                                                         {
1316                                                                 // client is still trying to connect,
1317                                                                 // so we send a duplicate reply
1318                                                                 if (developer.integer)
1319                                                                         Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1320                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1321                                                         }
1322 #if 0
1323                                                         else if (clientnum < svs.maxclients)
1324                                                         {
1325                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1326                                                                 {
1327                                                                         // client crashed and is coming back, keep their stuff intact
1328                                                                         SV_SendServerinfo(client);
1329                                                                         //host_client = client;
1330                                                                         //SV_DropClient (true);
1331                                                                 }
1332                                                                 // else ignore them
1333                                                         }
1334 #endif
1335                                                         else
1336                                                         {
1337                                                                 // this is a new client, find a slot
1338                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1339                                                                         if (!client->active)
1340                                                                                 break;
1341                                                                 if (clientnum < svs.maxclients)
1342                                                                 {
1343                                                                         // prepare the client struct
1344                                                                         if ((conn = NetConn_Open(mysocket, peeraddress)))
1345                                                                         {
1346                                                                                 // allocated connection
1347                                                                                 LHNETADDRESS_ToString(peeraddress, conn->address, sizeof(conn->address), true);
1348                                                                                 if (developer.integer)
1349                                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1350                                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1351                                                                                 // now set up the client
1352                                                                                 SV_ConnectClient(clientnum, conn);
1353                                                                                 NetConn_Heartbeat(1);
1354                                                                         }
1355                                                                 }
1356                                                                 else
1357                                                                 {
1358                                                                         // server is full
1359                                                                         if (developer.integer)
1360                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1361                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1362                                                                 }
1363                                                         }
1364                                                 }
1365                                         }
1366                                 }
1367                                 return true;
1368                         }
1369                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1370                         {
1371                                 const char *challenge = NULL;
1372                                 // If there was a challenge in the getinfo message
1373                                 if (length > 8 && string[7] == ' ')
1374                                         challenge = string + 8;
1375                                 for (i = 0, n = 0;i < svs.maxclients;i++)
1376                                         if (svs.clients[i].active)
1377                                                 n++;
1378                                 responselength = dpsnprintf(response, sizeof(response), "\377\377\377\377infoResponse\x0A"
1379                                                         "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
1380                                                         "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d%s%s",
1381                                                         gamename, com_modname, svs.maxclients, n,
1382                                                         sv.name, hostname.string, NET_PROTOCOL_VERSION, challenge ? "\\challenge\\" : "", challenge ? challenge : "");
1383                                 // does it fit in the buffer?
1384                                 if (responselength >= 0)
1385                                 {
1386                                         if (developer.integer)
1387                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1388                                         NetConn_WriteString(mysocket, response, peeraddress);
1389                                 }
1390                                 return true;
1391                         }
1392                         /*
1393                         if (!strncmp(string, "ping", 4))
1394                         {
1395                                 if (developer.integer)
1396                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1397                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1398                                 return true;
1399                         }
1400                         if (!strncmp(string, "ack", 3))
1401                                 return true;
1402                         */
1403                         // we may not have liked the packet, but it was a command packet, so
1404                         // we're done processing this packet now
1405                         return true;
1406                 }
1407                 // LordHavoc: disabled netquake control packet support in server
1408 #if 0
1409                 {
1410                         int c, control;
1411                         // netquake control packets, supported for compatibility only
1412                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1413                         {
1414                                 c = data[4];
1415                                 data += 5;
1416                                 length -= 5;
1417                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1418                                 switch (c)
1419                                 {
1420                                 case CCREQ_CONNECT:
1421                                         //if (developer.integer)
1422                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1423                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
1424                                         {
1425                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1426                                                 {
1427                                                         if (developer.integer)
1428                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1429                                                         SZ_Clear(&net_message);
1430                                                         // save space for the header, filled in later
1431                                                         MSG_WriteLong(&net_message, 0);
1432                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1433                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
1434                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1435                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1436                                                         SZ_Clear(&net_message);
1437                                                 }
1438                                                 else
1439                                                 {
1440                                                         // see if this is a duplicate connection request
1441                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1442                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1443                                                                         break;
1444                                                         if (clientnum < svs.maxclients)
1445                                                         {
1446                                                                 // duplicate connection request
1447                                                                 if (realtime - client->connecttime < 2.0)
1448                                                                 {
1449                                                                         // client is still trying to connect,
1450                                                                         // so we send a duplicate reply
1451                                                                         if (developer.integer)
1452                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1453                                                                         SZ_Clear(&net_message);
1454                                                                         // save space for the header, filled in later
1455                                                                         MSG_WriteLong(&net_message, 0);
1456                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1457                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1458                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1459                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1460                                                                         SZ_Clear(&net_message);
1461                                                                 }
1462 #if 0
1463                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1464                                                                 {
1465                                                                         SV_SendServerinfo(client);
1466                                                                         // the old client hasn't sent us anything
1467                                                                         // in quite a while, so kick off and let
1468                                                                         // the retry take care of it...
1469                                                                         //host_client = client;
1470                                                                         //SV_DropClient (true);
1471                                                                 }
1472 #endif
1473                                                         }
1474                                                         else
1475                                                         {
1476                                                                 // this is a new client, find a slot
1477                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1478                                                                         if (!client->active)
1479                                                                                 break;
1480                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
1481                                                                 {
1482                                                                         // connect to the client
1483                                                                         // everything is allocated, just fill in the details
1484                                                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
1485                                                                         if (developer.integer)
1486                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
1487                                                                         // send back the info about the server connection
1488                                                                         SZ_Clear(&net_message);
1489                                                                         // save space for the header, filled in later
1490                                                                         MSG_WriteLong(&net_message, 0);
1491                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1492                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
1493                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1494                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1495                                                                         SZ_Clear(&net_message);
1496                                                                         // now set up the client struct
1497                                                                         SV_ConnectClient(clientnum, conn);
1498                                                                         NetConn_Heartbeat(1);
1499                                                                 }
1500                                                                 else
1501                                                                 {
1502                                                                         //if (developer.integer)
1503                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
1504                                                                         // no room; try to let player know
1505                                                                         SZ_Clear(&net_message);
1506                                                                         // save space for the header, filled in later
1507                                                                         MSG_WriteLong(&net_message, 0);
1508                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1509                                                                         MSG_WriteString(&net_message, "Server is full.\n");
1510                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1511                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1512                                                                         SZ_Clear(&net_message);
1513                                                                 }
1514                                                         }
1515                                                 }
1516                                         }
1517                                         break;
1518 #if 0
1519                                 case CCREQ_SERVER_INFO:
1520                                         if (developer.integer)
1521                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
1522                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
1523                                         {
1524                                                 if (developer.integer)
1525                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
1526                                                 SZ_Clear(&net_message);
1527                                                 // save space for the header, filled in later
1528                                                 MSG_WriteLong(&net_message, 0);
1529                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1530                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1531                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1532                                                 MSG_WriteString(&net_message, hostname.string);
1533                                                 MSG_WriteString(&net_message, sv.name);
1534                                                 MSG_WriteByte(&net_message, net_activeconnections);
1535                                                 MSG_WriteByte(&net_message, svs.maxclients);
1536                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1537                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1538                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1539                                                 SZ_Clear(&net_message);
1540                                         }
1541                                         break;
1542                                 case CCREQ_PLAYER_INFO:
1543                                         if (developer.integer)
1544                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1545                                         if (sv.active)
1546                                         {
1547                                                 int playerNumber, activeNumber, clientNumber;
1548                                                 client_t *client;
1549
1550                                                 playerNumber = MSG_ReadByte();
1551                                                 activeNumber = -1;
1552                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1553                                                         if (client->active && ++activeNumber == playerNumber)
1554                                                                 break;
1555                                                 if (clientNumber != svs.maxclients)
1556                                                 {
1557                                                         SZ_Clear(&net_message);
1558                                                         // save space for the header, filled in later
1559                                                         MSG_WriteLong(&net_message, 0);
1560                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1561                                                         MSG_WriteByte(&net_message, playerNumber);
1562                                                         MSG_WriteString(&net_message, client->name);
1563                                                         MSG_WriteLong(&net_message, client->colors);
1564                                                         MSG_WriteLong(&net_message, (int)client->edict->v->frags);
1565                                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
1566                                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
1567                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1568                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1569                                                         SZ_Clear(&net_message);
1570                                                 }
1571                                         }
1572                                         break;
1573                                 case CCREQ_RULE_INFO:
1574                                         if (developer.integer)
1575                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1576                                         if (sv.active)
1577                                         {
1578                                                 char *prevCvarName;
1579                                                 cvar_t *var;
1580
1581                                                 // find the search start location
1582                                                 prevCvarName = MSG_ReadString();
1583                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1584
1585                                                 // send the response
1586                                                 SZ_Clear(&net_message);
1587                                                 // save space for the header, filled in later
1588                                                 MSG_WriteLong(&net_message, 0);
1589                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1590                                                 if (var)
1591                                                 {
1592                                                         MSG_WriteString(&net_message, var->name);
1593                                                         MSG_WriteString(&net_message, var->string);
1594                                                 }
1595                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1596                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1597                                                 SZ_Clear(&net_message);
1598                                         }
1599                                         break;
1600 #endif
1601                                 default:
1602                                         break;
1603                                 }
1604                                 // we may not have liked the packet, but it was a valid control
1605                                 // packet, so we're done processing this packet now
1606                                 return true;
1607                         }
1608                 }
1609 #endif
1610                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1611                 {
1612                         if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1613                         {
1614                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1615                                         SV_ReadClientMessage();
1616                                 return ret;
1617                         }
1618                 }
1619         }
1620         return 0;
1621 }
1622
1623 void NetConn_ServerFrame(void)
1624 {
1625         int i, length;
1626         lhnetaddress_t peeraddress;
1627         netconn_t *conn;
1628         NetConn_UpdateServerStuff();
1629         for (i = 0;i < sv_numsockets;i++)
1630                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1631                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1632         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1633         {
1634                 // never timeout loopback connections
1635                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
1636                 {
1637                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1638                         SV_DropClient(false);
1639                 }
1640         }
1641         for (conn = netconn_list;conn;conn = conn->next)
1642                 NetConn_ReSendMessage(conn);
1643 }
1644
1645 void NetConn_QueryMasters(void)
1646 {
1647         int i;
1648         int masternum;
1649         lhnetaddress_t masteraddress;
1650         lhnetaddress_t broadcastaddress;
1651         char request[256];
1652
1653         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
1654                 return;
1655
1656         // 26000 is the default quake server port, servers on other ports will not
1657         // be found
1658         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
1659         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
1660
1661         for (i = 0;i < cl_numsockets;i++)
1662         {
1663                 if (cl_sockets[i])
1664                 {
1665                         // search LAN for Quake servers
1666                         SZ_Clear(&net_message);
1667                         // save space for the header, filled in later
1668                         MSG_WriteLong(&net_message, 0);
1669                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1670                         MSG_WriteString(&net_message, "QUAKE");
1671                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1672                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1673                         NetConn_Write(cl_sockets[i], net_message.data, net_message.cursize, &broadcastaddress);
1674                         SZ_Clear(&net_message);
1675
1676                         // search LAN for DarkPlaces servers
1677                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377getinfo", &broadcastaddress);
1678
1679                         // build the getservers message to send to the master servers
1680                         dpsnprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1681
1682                         // search internet
1683                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1684                         {
1685                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1686                                 {
1687                                         masterquerycount++;
1688                                         NetConn_WriteString(cl_sockets[i], request, &masteraddress);
1689                                 }
1690                         }
1691                 }
1692         }
1693         if (!masterquerycount)
1694         {
1695                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
1696                 M_Update_Return_Reason("No network");
1697         }
1698 }
1699
1700 void NetConn_Heartbeat(int priority)
1701 {
1702         lhnetaddress_t masteraddress;
1703         int masternum;
1704         lhnetsocket_t *mysocket;
1705
1706         // if it's a state change (client connected), limit next heartbeat to no
1707         // more than 30 sec in the future
1708         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1709                 nextheartbeattime = realtime + 30.0;
1710
1711         // limit heartbeatperiod to 30 to 270 second range,
1712         // lower limit is to avoid abusing master servers with excess traffic,
1713         // upper limit is to avoid timing out on the master server (which uses
1714         // 300 sec timeout)
1715         if (sv_heartbeatperiod.value < 30)
1716                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1717         if (sv_heartbeatperiod.value > 270)
1718                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1719
1720         // make advertising optional and don't advertise singleplayer games, and
1721         // only send a heartbeat as often as the admin wants
1722         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1723         {
1724                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1725                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1726                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1727                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
1728         }
1729 }
1730
1731 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1732 {
1733         int i, count = 0;
1734         qbyte sent[MAX_SCOREBOARD];
1735
1736         memset(sent, 0, sizeof(sent));
1737
1738         // simultaneously wait for the first CanSendMessage and send the message,
1739         // then wait for a second CanSendMessage (verifying it was received), or
1740         // the client drops and is no longer counted
1741         // the loop aborts when either it runs out of clients to send to, or a
1742         // timeout expires
1743         blocktime += Sys_DoubleTime();
1744         do
1745         {
1746                 count = 0;
1747                 NetConn_ClientFrame();
1748                 NetConn_ServerFrame();
1749                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1750                 {
1751                         if (host_client->netconnection)
1752                         {
1753                                 if (NetConn_CanSendMessage(host_client->netconnection))
1754                                 {
1755                                         if (!sent[i])
1756                                                 NetConn_SendReliableMessage(host_client->netconnection, data);
1757                                         sent[i] = true;
1758                                 }
1759                                 if (!NetConn_CanSendMessage(host_client->netconnection))
1760                                         count++;
1761                         }
1762                 }
1763         }
1764         while (count && Sys_DoubleTime() < blocktime);
1765         return count;
1766 }
1767
1768 static void Net_Heartbeat_f(void)
1769 {
1770         if (sv.active)
1771                 NetConn_Heartbeat(2);
1772         else
1773                 Con_Print("No server running, can not heartbeat to master server.\n");
1774 }
1775
1776 void PrintStats(netconn_t *conn)
1777 {
1778         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1779 }
1780
1781 void Net_Stats_f(void)
1782 {
1783         netconn_t *conn;
1784         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
1785         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
1786         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
1787         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
1788         Con_Printf("packetsSent                = %i\n", packetsSent);
1789         Con_Printf("packetsReSent              = %i\n", packetsReSent);
1790         Con_Printf("packetsReceived            = %i\n", packetsReceived);
1791         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
1792         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
1793         Con_Print("connections                =\n");
1794         for (conn = netconn_list;conn;conn = conn->next)
1795                 PrintStats(conn);
1796 }
1797
1798 void Net_Slist_f(void)
1799 {
1800         ServerList_ResetMasks();
1801         serverlist_sortbyfield = SLIF_PING;
1802         serverlist_sortdescending = false;
1803     if (m_state != m_slist) {
1804                 Con_Print("Sending requests to master servers\n");
1805                 ServerList_QueryList();
1806                 serverlist_consoleoutput = true;
1807                 Con_Print("Listening for replies...\n");
1808         } else
1809                 ServerList_QueryList();
1810 }
1811
1812 void NetConn_Init(void)
1813 {
1814         int i;
1815         lhnetaddress_t tempaddress;
1816         netconn_mempool = Mem_AllocPool("network connections", 0, NULL);
1817         Cmd_AddCommand("net_stats", Net_Stats_f);
1818         Cmd_AddCommand("net_slist", Net_Slist_f);
1819         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
1820         Cvar_RegisterVariable(&net_messagetimeout);
1821         Cvar_RegisterVariable(&net_messagerejointimeout);
1822         Cvar_RegisterVariable(&net_connecttimeout);
1823         Cvar_RegisterVariable(&cl_netlocalping);
1824         Cvar_RegisterVariable(&cl_netpacketloss);
1825         Cvar_RegisterVariable(&hostname);
1826         Cvar_RegisterVariable(&developer_networking);
1827         Cvar_RegisterVariable(&cl_netport);
1828         Cvar_RegisterVariable(&sv_netport);
1829         Cvar_RegisterVariable(&net_address);
1830         //Cvar_RegisterVariable(&net_address_ipv6);
1831         Cvar_RegisterVariable(&sv_public);
1832         Cvar_RegisterVariable(&sv_heartbeatperiod);
1833         for (i = 0;sv_masters[i].name;i++)
1834                 Cvar_RegisterVariable(&sv_masters[i]);
1835 // 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.
1836         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
1837         {
1838                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
1839                 {
1840                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
1841                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
1842                 }
1843                 else
1844                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
1845         }
1846 // 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
1847         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
1848         {
1849                 i = atoi(com_argv[i + 1]);
1850                 if (i >= 0 && i < 65536)
1851                 {
1852                         Con_Printf("-port option used, setting port cvar to %i\n", i);
1853                         Cvar_SetValueQuick(&sv_netport, i);
1854                 }
1855                 else
1856                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
1857         }
1858         cl_numsockets = 0;
1859         sv_numsockets = 0;
1860         net_message.data = net_message_buf;
1861         net_message.maxsize = sizeof(net_message_buf);
1862         net_message.cursize = 0;
1863         LHNET_Init();
1864 }
1865
1866 void NetConn_Shutdown(void)
1867 {
1868         NetConn_CloseClientPorts();
1869         NetConn_CloseServerPorts();
1870         LHNET_Shutdown();
1871 }
1872