eliminated qbyte type, now uses unsigned char throughout the engine for this purpose
[xonotic/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 // note this defaults on for dedicated servers, off for listen servers
29 cvar_t sv_public = {0, "sv_public", "0"};
30 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "120"};
31
32 // FIXME: resolve DNS on masters whenever their value changes and cache it (to avoid major delays in active servers when they heartbeat)
33 static cvar_t sv_masters [] =
34 {
35         {CVAR_SAVE, "sv_master1", ""},
36         {CVAR_SAVE, "sv_master2", ""},
37         {CVAR_SAVE, "sv_master3", ""},
38         {CVAR_SAVE, "sv_master4", ""},
39         {0, "sv_masterextra1", "ghdigital.com"}, //69.59.212.88
40         {0, "sv_masterextra2", "dpmaster.deathmask.net"}, //66.169.205.20
41         {0, "sv_masterextra3", "12.166.196.192"}, //blaze.mindphukd.org (doesn't resolve currently but works as an ip)
42         {0, NULL, NULL}
43 };
44
45 static double nextheartbeattime = 0;
46
47 sizebuf_t net_message;
48 static unsigned char net_message_buf[NET_MAXMESSAGE];
49
50 cvar_t net_messagetimeout = {0, "net_messagetimeout","300"};
51 cvar_t net_messagerejointimeout = {0, "net_messagerejointimeout","10"};
52 cvar_t net_connecttimeout = {0, "net_connecttimeout","10"};
53 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED"};
54 cvar_t developer_networking = {0, "developer_networking", "0"};
55
56 cvar_t cl_netlocalping = {0, "cl_netlocalping","0"};
57 static cvar_t cl_netpacketloss = {0, "cl_netpacketloss","0"};
58 static cvar_t net_slist_queriespersecond = {0, "net_slist_queriespersecond", "20"};
59 static cvar_t net_slist_queriesperframe = {0, "net_slist_queriesperframe", "4"};
60 static cvar_t net_slist_timeout = {0, "net_slist_timeout", "4"};
61 static cvar_t net_slist_maxtries = {0, "net_slist_maxtries", "3"};
62
63 /* statistic counters */
64 static int packetsSent = 0;
65 static int packetsReSent = 0;
66 static int packetsReceived = 0;
67 static int receivedDuplicateCount = 0;
68 static int droppedDatagrams = 0;
69
70 static int unreliableMessagesSent = 0;
71 static int unreliableMessagesReceived = 0;
72 static int reliableMessagesSent = 0;
73 static int reliableMessagesReceived = 0;
74
75 double masterquerytime = -1000;
76 int masterquerycount = 0;
77 int masterreplycount = 0;
78 int serverquerycount = 0;
79 int serverreplycount = 0;
80
81 // this is only false if there are still servers left to query
82 int serverlist_querysleep = true;
83
84 static unsigned char sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
85 static unsigned char readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
86
87 int cl_numsockets;
88 lhnetsocket_t *cl_sockets[16];
89 int sv_numsockets;
90 lhnetsocket_t *sv_sockets[16];
91
92 netconn_t *netconn_list = NULL;
93 mempool_t *netconn_mempool = NULL;
94
95 cvar_t cl_netport = {0, "cl_port", "0"};
96 cvar_t sv_netport = {0, "port", "26000"};
97 cvar_t net_address = {0, "net_address", "0.0.0.0"};
98 //cvar_t net_netaddress_ipv6 = {0, "net_address_ipv6", "[0:0:0:0:0:0:0:0]"};
99
100 // ServerList interface
101 serverlist_mask_t serverlist_andmasks[SERVERLIST_ANDMASKCOUNT];
102 serverlist_mask_t serverlist_ormasks[SERVERLIST_ORMASKCOUNT];
103
104 serverlist_infofield_t serverlist_sortbyfield;
105 qboolean serverlist_sortdescending;
106
107 int serverlist_viewcount = 0;
108 serverlist_entry_t *serverlist_viewlist[SERVERLIST_VIEWLISTSIZE];
109
110 int serverlist_cachecount;
111 serverlist_entry_t serverlist_cache[SERVERLIST_TOTALSIZE];
112
113 qboolean serverlist_consoleoutput;
114
115 // helper function to insert a value into the viewset
116 // spare entries will be removed
117 static void _ServerList_ViewList_Helper_InsertBefore( int index, serverlist_entry_t *entry )
118 {
119     int i;
120         if( serverlist_viewcount < SERVERLIST_VIEWLISTSIZE ) {
121                 i = serverlist_viewcount++;
122         } else {
123                 i = SERVERLIST_VIEWLISTSIZE - 1;
124         }
125
126         for( ; i > index ; i-- )
127                 serverlist_viewlist[ i ] = serverlist_viewlist[ i - 1 ];
128
129         serverlist_viewlist[index] = entry;
130 }
131
132 // we suppose serverlist_viewcount to be valid, ie > 0
133 static void _ServerList_ViewList_Helper_Remove( int index )
134 {
135         serverlist_viewcount--;
136         for( ; index < serverlist_viewcount ; index++ )
137                 serverlist_viewlist[index] = serverlist_viewlist[index + 1];
138 }
139
140 // returns true if A should be inserted before B
141 static qboolean _ServerList_Entry_Compare( serverlist_entry_t *A, serverlist_entry_t *B )
142 {
143         int result = 0; // > 0 if for numbers A > B and for text if A < B
144
145         switch( serverlist_sortbyfield ) {
146                 case SLIF_PING:
147                         result = A->info.ping - B->info.ping;
148                         break;
149                 case SLIF_MAXPLAYERS:
150                         result = A->info.maxplayers - B->info.maxplayers;
151                         break;
152                 case SLIF_NUMPLAYERS:
153                         result = A->info.numplayers - B->info.numplayers;
154                         break;
155                 case SLIF_PROTOCOL:
156                         result = A->info.protocol - B->info.protocol;
157                         break;
158                 case SLIF_CNAME:
159                         result = strcmp( B->info.cname, A->info.cname );
160                         break;
161                 case SLIF_GAME:
162                         result = strcmp( B->info.game, A->info.game );
163                         break;
164                 case SLIF_MAP:
165                         result = strcmp( B->info.map, A->info.map );
166                         break;
167                 case SLIF_MOD:
168                         result = strcmp( B->info.mod, A->info.mod );
169                         break;
170                 case SLIF_NAME:
171                         result = strcmp( B->info.name, A->info.name );
172                         break;
173                 default:
174                         Con_DPrint( "_ServerList_Entry_Compare: Bad serverlist_sortbyfield!\n" );
175                         break;
176         }
177
178         if( serverlist_sortdescending )
179                 return result > 0;
180         return result < 0;
181 }
182
183 static qboolean _ServerList_CompareInt( int A, serverlist_maskop_t op, int B )
184 {
185         // This should actually be done with some intermediate and end-of-function return
186         switch( op ) {
187                 case SLMO_LESS:
188                         return A < B;
189                 case SLMO_LESSEQUAL:
190                         return A <= B;
191                 case SLMO_EQUAL:
192                         return A == B;
193                 case SLMO_GREATER:
194                         return A > B;
195                 case SLMO_NOTEQUAL:
196                         return A != B;
197                 case SLMO_GREATEREQUAL:
198                 case SLMO_CONTAINS:
199                 case SLMO_NOTCONTAIN:
200                         return A >= B;
201                 default:
202                         Con_DPrint( "_ServerList_CompareInt: Bad op!\n" );
203                         return false;
204         }
205 }
206
207 static qboolean _ServerList_CompareStr( const char *A, serverlist_maskop_t op, const char *B )
208 {
209         int i;
210         char bufferA[ 256 ], bufferB[ 256 ]; // should be more than enough
211         for (i = 0;i < (int)sizeof(bufferA)-1 && A[i];i++)
212                 bufferA[i] = (A[i] >= 'A' && A[i] <= 'Z') ? (A[i] + 'a' - 'A') : A[i];
213         bufferA[i] = 0;
214         for (i = 0;i < (int)sizeof(bufferB)-1 && B[i];i++)
215                 bufferB[i] = (B[i] >= 'A' && B[i] <= 'Z') ? (B[i] + 'a' - 'A') : B[i];
216         bufferB[i] = 0;
217
218         // Same here, also using an intermediate & final return would be more appropriate
219         // A info B mask
220         switch( op ) {
221                 case SLMO_CONTAINS:
222                         return *bufferB && !!strstr( bufferA, bufferB ); // we want a real bool
223                 case SLMO_NOTCONTAIN:
224                         return !*bufferB || !strstr( bufferA, bufferB );
225                 case SLMO_LESS:
226                         return strcmp( bufferA, bufferB ) < 0;
227                 case SLMO_LESSEQUAL:
228                         return strcmp( bufferA, bufferB ) <= 0;
229                 case SLMO_EQUAL:
230                         return strcmp( bufferA, bufferB ) == 0;
231                 case SLMO_GREATER:
232                         return strcmp( bufferA, bufferB ) > 0;
233                 case SLMO_NOTEQUAL:
234                         return strcmp( bufferA, bufferB ) != 0;
235                 case SLMO_GREATEREQUAL:
236                         return strcmp( bufferA, bufferB ) >= 0;
237                 default:
238                         Con_DPrint( "_ServerList_CompareStr: Bad op!\n" );
239                         return false;
240         }
241 }
242
243 static qboolean _ServerList_Entry_Mask( serverlist_mask_t *mask, serverlist_info_t *info )
244 {
245         if( !_ServerList_CompareInt( info->ping, mask->tests[SLIF_PING], mask->info.ping ) )
246                 return false;
247         if( !_ServerList_CompareInt( info->maxplayers, mask->tests[SLIF_MAXPLAYERS], mask->info.maxplayers ) )
248                 return false;
249         if( !_ServerList_CompareInt( info->numplayers, mask->tests[SLIF_NUMPLAYERS], mask->info.numplayers ) )
250                 return false;
251         if( !_ServerList_CompareInt( info->protocol, mask->tests[SLIF_PROTOCOL], mask->info.protocol ))
252                 return false;
253         if( *mask->info.cname
254                 && !_ServerList_CompareStr( info->cname, mask->tests[SLIF_CNAME], mask->info.cname ) )
255                 return false;
256         if( *mask->info.game
257                 && !_ServerList_CompareStr( info->game, mask->tests[SLIF_GAME], mask->info.game ) )
258                 return false;
259         if( *mask->info.mod
260                 && !_ServerList_CompareStr( info->mod, mask->tests[SLIF_MOD], mask->info.mod ) )
261                 return false;
262         if( *mask->info.map
263                 && !_ServerList_CompareStr( info->map, mask->tests[SLIF_MAP], mask->info.map ) )
264                 return false;
265         if( *mask->info.name
266                 && !_ServerList_CompareStr( info->name, mask->tests[SLIF_NAME], mask->info.name ) )
267                 return false;
268         return true;
269 }
270
271 static void ServerList_ViewList_Insert( serverlist_entry_t *entry )
272 {
273         int start, end, mid;
274
275         // FIXME: change this to be more readable (...)
276         // now check whether it passes through the masks
277         for( start = 0 ; serverlist_andmasks[start].active && start < SERVERLIST_ANDMASKCOUNT ; start++ )
278                 if( !_ServerList_Entry_Mask( &serverlist_andmasks[start], &entry->info ) )
279                         return;
280
281         for( start = 0 ; serverlist_ormasks[start].active && start < SERVERLIST_ORMASKCOUNT ; start++ )
282                 if( _ServerList_Entry_Mask( &serverlist_ormasks[start], &entry->info ) )
283                         break;
284         if( start == SERVERLIST_ORMASKCOUNT || (start > 0 && !serverlist_ormasks[start].active) )
285                 return;
286
287         if( !serverlist_viewcount ) {
288                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
289                 return;
290         }
291         // ok, insert it, we just need to find out where exactly:
292
293         // two special cases
294         // check whether to insert it as new first item
295         if( _ServerList_Entry_Compare( entry, serverlist_viewlist[0] ) ) {
296                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
297                 return;
298         } // check whether to insert it as new last item
299         else if( !_ServerList_Entry_Compare( entry, serverlist_viewlist[serverlist_viewcount - 1] ) ) {
300                 _ServerList_ViewList_Helper_InsertBefore( serverlist_viewcount, entry );
301                 return;
302         }
303         start = 0;
304         end = serverlist_viewcount - 1;
305         while( end > start + 1 )
306         {
307                 mid = (start + end) / 2;
308                 // test the item that lies in the middle between start and end
309                 if( _ServerList_Entry_Compare( entry, serverlist_viewlist[mid] ) )
310                         // the item has to be in the upper half
311                         end = mid;
312                 else
313                         // the item has to be in the lower half
314                         start = mid;
315         }
316         _ServerList_ViewList_Helper_InsertBefore( start + 1, entry );
317 }
318
319 static void ServerList_ViewList_Remove( serverlist_entry_t *entry )
320 {
321         int i;
322         for( i = 0; i < serverlist_viewcount; i++ )
323         {
324                 if (serverlist_viewlist[i] == entry)
325                 {
326                         _ServerList_ViewList_Helper_Remove(i);
327                         break;
328                 }
329         }
330 }
331
332 void ServerList_RebuildViewList(void)
333 {
334         int i;
335
336         serverlist_viewcount = 0;
337         for( i = 0 ; i < serverlist_cachecount ; i++ )
338                 if( serverlist_cache[i].query == SQS_QUERIED )
339                         ServerList_ViewList_Insert( &serverlist_cache[i] );
340 }
341
342 void ServerList_ResetMasks(void)
343 {
344         memset( &serverlist_andmasks, 0, sizeof( serverlist_andmasks ) );
345         memset( &serverlist_ormasks, 0, sizeof( serverlist_ormasks ) );
346 }
347
348 #if 0
349 static void _ServerList_Test(void)
350 {
351         int i;
352         for( i = 0 ; i < 1024 ; i++ ) {
353                 memset( &serverlist_cache[serverlist_cachecount], 0, sizeof( serverlist_entry_t ) );
354                 serverlist_cache[serverlist_cachecount].info.ping = 1000 + 1024 - i;
355                 dpsnprintf( serverlist_cache[serverlist_cachecount].info.name, 128, "Black's ServerList Test %i", i );
356                 serverlist_cache[serverlist_cachecount].finished = true;
357                 sprintf( serverlist_cache[serverlist_cachecount].line1, "%i %s", serverlist_cache[serverlist_cachecount].info.ping, serverlist_cache[serverlist_cachecount].info.name );
358                 ServerList_ViewList_Insert( &serverlist_cache[serverlist_cachecount] );
359                 serverlist_cachecount++;
360         }
361 }
362 #endif
363
364 void ServerList_QueryList(void)
365 {
366         masterquerytime = realtime;
367         masterquerycount = 0;
368         masterreplycount = 0;
369         serverquerycount = 0;
370         serverreplycount = 0;
371         serverlist_cachecount = 0;
372         serverlist_viewcount = 0;
373         serverlist_consoleoutput = false;
374
375         //_ServerList_Test();
376
377         NetConn_QueryMasters();
378 }
379
380 // rest
381
382 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
383 {
384         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
385         int i;
386         if (length == 0)
387                 return 0;
388         if (cl_netpacketloss.integer)
389                 for (i = 0;i < cl_numsockets;i++)
390                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
391                                 return 0;
392         if (developer_networking.integer)
393         {
394                 char addressstring[128], addressstring2[128];
395                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
396                 if (length > 0)
397                 {
398                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
399                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
400                         Com_HexDumpToConsole((unsigned char *)data, length);
401                 }
402                 else
403                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
404         }
405         return length;
406 }
407
408 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
409 {
410         int ret;
411         int i;
412         if (cl_netpacketloss.integer)
413                 for (i = 0;i < cl_numsockets;i++)
414                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
415                                 return length;
416         ret = LHNET_Write(mysocket, data, length, peeraddress);
417         if (developer_networking.integer)
418         {
419                 char addressstring[128], addressstring2[128];
420                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
421                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
422                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
423                 Com_HexDumpToConsole((unsigned char *)data, length);
424         }
425         return ret;
426 }
427
428 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
429 {
430         // note this does not include the trailing NULL because we add that in the parser
431         return NetConn_Write(mysocket, string, (int)strlen(string), peeraddress);
432 }
433
434 int NetConn_SendReliableMessage(netconn_t *conn, sizebuf_t *data)
435 {
436         unsigned int packetLen;
437         unsigned int dataLen;
438         unsigned int eom;
439         unsigned int *header;
440
441 //#ifdef DEBUG
442         if (data->cursize == 0)
443         {
444                 Con_Printf ("Datagram_SendMessage: zero length message\n");
445                 return -1;
446         }
447
448         if (data->cursize > (int)sizeof(conn->sendMessage))
449         {
450                 Con_Printf ("Datagram_SendMessage: message too big (%u > %u)\n", data->cursize, sizeof(conn->sendMessage));
451                 return -1;
452         }
453
454         if (conn->canSend == false)
455         {
456                 Con_Printf ("SendMessage: called with canSend == false\n");
457                 return -1;
458         }
459 //#endif
460
461         memcpy(conn->sendMessage, data->data, data->cursize);
462         conn->sendMessageLength = data->cursize;
463
464         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
465         {
466                 dataLen = conn->sendMessageLength;
467                 eom = NETFLAG_EOM;
468         }
469         else
470         {
471                 dataLen = MAX_PACKETFRAGMENT;
472                 eom = 0;
473         }
474
475         packetLen = NET_HEADERSIZE + dataLen;
476
477         header = (unsigned int *)sendbuffer;
478         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
479         header[1] = BigLong(conn->sendSequence);
480         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
481
482         conn->sendSequence++;
483         conn->canSend = false;
484
485         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
486                 return -1;
487
488         conn->lastSendTime = realtime;
489         packetsSent++;
490         reliableMessagesSent++;
491         return 1;
492 }
493
494 static void NetConn_SendMessageNext(netconn_t *conn)
495 {
496         unsigned int packetLen;
497         unsigned int dataLen;
498         unsigned int eom;
499         unsigned int *header;
500
501         if (conn->sendMessageLength && !conn->canSend && conn->sendNext)
502         {
503                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
504                 {
505                         dataLen = conn->sendMessageLength;
506                         eom = NETFLAG_EOM;
507                 }
508                 else
509                 {
510                         dataLen = MAX_PACKETFRAGMENT;
511                         eom = 0;
512                 }
513
514                 packetLen = NET_HEADERSIZE + dataLen;
515
516                 header = (unsigned int *)sendbuffer;
517                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
518                 header[1] = BigLong(conn->sendSequence);
519                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
520
521                 conn->sendSequence++;
522                 conn->sendNext = false;
523
524                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
525                         return;
526
527                 conn->lastSendTime = realtime;
528                 packetsSent++;
529         }
530 }
531
532 static void NetConn_ReSendMessage(netconn_t *conn)
533 {
534         unsigned int packetLen;
535         unsigned int dataLen;
536         unsigned int eom;
537         unsigned int *header;
538
539         if (conn->sendMessageLength && !conn->canSend && (realtime - conn->lastSendTime) > 1.0)
540         {
541                 if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
542                 {
543                         dataLen = conn->sendMessageLength;
544                         eom = NETFLAG_EOM;
545                 }
546                 else
547                 {
548                         dataLen = MAX_PACKETFRAGMENT;
549                         eom = 0;
550                 }
551
552                 packetLen = NET_HEADERSIZE + dataLen;
553
554                 header = (unsigned int *)sendbuffer;
555                 header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
556                 header[1] = BigLong(conn->sendSequence - 1);
557                 memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
558
559                 conn->sendNext = false;
560
561                 if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
562                         return;
563
564                 conn->lastSendTime = realtime;
565                 packetsReSent++;
566         }
567 }
568
569 qboolean NetConn_CanSendMessage(netconn_t *conn)
570 {
571         return conn->canSend;
572 }
573
574 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data)
575 {
576         int packetLen;
577         unsigned int *header;
578
579         packetLen = NET_HEADERSIZE + data->cursize;
580
581 //#ifdef DEBUG
582         if (data->cursize == 0)
583         {
584                 Con_Printf ("Datagram_SendUnreliableMessage: zero length message\n");
585                 return -1;
586         }
587
588         if (packetLen > (int)sizeof(sendbuffer))
589         {
590                 Con_Printf ("Datagram_SendUnreliableMessage: message too big %u\n", data->cursize);
591                 return -1;
592         }
593 //#endif
594
595         header = (unsigned int *)sendbuffer;
596         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
597         header[1] = BigLong(conn->unreliableSendSequence);
598         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
599
600         conn->unreliableSendSequence++;
601
602         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) != (int)packetLen)
603                 return -1;
604
605         packetsSent++;
606         unreliableMessagesSent++;
607         return 1;
608 }
609
610 void NetConn_CloseClientPorts(void)
611 {
612         for (;cl_numsockets > 0;cl_numsockets--)
613                 if (cl_sockets[cl_numsockets - 1])
614                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
615 }
616
617 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
618 {
619         lhnetaddress_t address;
620         lhnetsocket_t *s;
621         char addressstring2[1024];
622         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
623         {
624                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
625                 {
626                         cl_sockets[cl_numsockets++] = s;
627                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
628                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
629                 }
630                 else
631                 {
632                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
633                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
634                 }
635         }
636         else
637                 Con_Printf("Client unable to parse address %s\n", addressstring);
638 }
639
640 void NetConn_OpenClientPorts(void)
641 {
642         int port;
643         NetConn_CloseClientPorts();
644         port = bound(0, cl_netport.integer, 65535);
645         if (cl_netport.integer != port)
646                 Cvar_SetValueQuick(&cl_netport, port);
647         Con_Printf("Client using port %i\n", port);
648         NetConn_OpenClientPort("local:2", 0);
649         NetConn_OpenClientPort(net_address.string, port);
650         //NetConn_OpenClientPort(net_address_ipv6.string, port);
651 }
652
653 void NetConn_CloseServerPorts(void)
654 {
655         for (;sv_numsockets > 0;sv_numsockets--)
656                 if (sv_sockets[sv_numsockets - 1])
657                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
658 }
659
660 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
661 {
662         lhnetaddress_t address;
663         lhnetsocket_t *s;
664         int port;
665         char addressstring2[1024];
666
667         for (port = defaultport; port <= defaultport + 100; port++)
668         {
669                 if (LHNETADDRESS_FromString(&address, addressstring, port))
670                 {
671                         if ((s = LHNET_OpenSocket_Connectionless(&address)))
672                         {
673                                 sv_sockets[sv_numsockets++] = s;
674                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
675                                 Con_Printf("Server listening on address %s\n", addressstring2);
676                                 break;
677                         }
678                         else
679                         {
680                                 LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
681                                 Con_Printf("Server failed to open socket on address %s\n", addressstring2);
682                         }
683                 }
684                 else
685                 {
686                         Con_Printf("Server unable to parse address %s\n", addressstring);
687                         // if it cant parse one address, it wont be able to parse another for sure
688                         break;
689                 }
690         }
691 }
692
693 static void NetConn_UpdateServerStuff(void);
694 void NetConn_OpenServerPorts(int opennetports)
695 {
696         int port;
697         NetConn_CloseServerPorts();
698         NetConn_UpdateServerStuff();
699         port = bound(0, sv_netport.integer, 65535);
700         if (port == 0)
701                 port = 26000;
702         Con_Printf("Server using port %i\n", port);
703         if (sv_netport.integer != port)
704                 Cvar_SetValueQuick(&sv_netport, port);
705         if (cls.state != ca_dedicated)
706                 NetConn_OpenServerPort("local:1", 0);
707         if (opennetports)
708         {
709                 NetConn_OpenServerPort(net_address.string, port);
710                 //NetConn_OpenServerPort(net_address_ipv6.string, port);
711         }
712         if (sv_numsockets == 0)
713                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!\n");
714 }
715
716 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
717 {
718         int i, a = LHNETADDRESS_GetAddressType(address);
719         for (i = 0;i < cl_numsockets;i++)
720                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
721                         return cl_sockets[i];
722         return NULL;
723 }
724
725 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
726 {
727         int i, a = LHNETADDRESS_GetAddressType(address);
728         for (i = 0;i < sv_numsockets;i++)
729                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
730                         return sv_sockets[i];
731         return NULL;
732 }
733
734 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
735 {
736         netconn_t *conn;
737         conn = (netconn_t *)Mem_Alloc(netconn_mempool, sizeof(*conn));
738         conn->mysocket = mysocket;
739         conn->peeraddress = *peeraddress;
740         conn->canSend = true;
741         conn->lastMessageTime = realtime;
742         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
743         // reduce effectiveness of connection request floods
744         conn->timeout = realtime + net_connecttimeout.value;
745         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
746         conn->next = netconn_list;
747         netconn_list = conn;
748         return conn;
749 }
750
751 void NetConn_Close(netconn_t *conn)
752 {
753         netconn_t *c;
754         // remove connection from list
755         if (conn == netconn_list)
756                 netconn_list = conn->next;
757         else
758         {
759                 for (c = netconn_list;c;c = c->next)
760                 {
761                         if (c->next == conn)
762                         {
763                                 c->next = conn->next;
764                                 break;
765                         }
766                 }
767                 // not found in list, we'll avoid crashing here...
768                 if (!c)
769                         return;
770         }
771         // free connection
772         Mem_Free(conn);
773 }
774
775 static int clientport = -1;
776 static int clientport2 = -1;
777 static int hostport = -1;
778 static void NetConn_UpdateServerStuff(void)
779 {
780         if (cls.state != ca_dedicated)
781         {
782                 if (clientport2 != cl_netport.integer)
783                 {
784                         clientport2 = cl_netport.integer;
785                         if (cls.state == ca_connected)
786                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
787                 }
788                 if (cls.state == ca_disconnected && clientport != clientport2)
789                 {
790                         clientport = clientport2;
791                         NetConn_CloseClientPorts();
792                 }
793                 if (cl_numsockets == 0)
794                         NetConn_OpenClientPorts();
795         }
796
797         if (hostport != sv_netport.integer)
798         {
799                 hostport = sv_netport.integer;
800                 if (sv.active)
801                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
802         }
803 }
804
805 int NetConn_ReceivedMessage(netconn_t *conn, unsigned char *data, int length)
806 {
807         unsigned int count;
808         unsigned int flags;
809         unsigned int sequence;
810         int qlength;
811
812         if (length >= 8)
813         {
814                 qlength = (unsigned int)BigLong(((int *)data)[0]);
815                 flags = qlength & ~NETFLAG_LENGTH_MASK;
816                 qlength &= NETFLAG_LENGTH_MASK;
817                 // control packets were already handled
818                 if (!(flags & NETFLAG_CTL) && qlength == length)
819                 {
820                         sequence = BigLong(((int *)data)[1]);
821                         packetsReceived++;
822                         data += 8;
823                         length -= 8;
824                         if (flags & NETFLAG_UNRELIABLE)
825                         {
826                                 if (sequence >= conn->unreliableReceiveSequence)
827                                 {
828                                         if (sequence > conn->unreliableReceiveSequence)
829                                         {
830                                                 count = sequence - conn->unreliableReceiveSequence;
831                                                 droppedDatagrams += count;
832                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
833                                         }
834                                         conn->unreliableReceiveSequence = sequence + 1;
835                                         conn->lastMessageTime = realtime;
836                                         conn->timeout = realtime + net_messagetimeout.value;
837                                         unreliableMessagesReceived++;
838                                         if (length > 0)
839                                         {
840                                                 SZ_Clear(&net_message);
841                                                 SZ_Write(&net_message, data, length);
842                                                 MSG_BeginReading();
843                                                 return 2;
844                                         }
845                                 }
846                                 else
847                                         Con_DPrint("Got a stale datagram\n");
848                                 return 1;
849                         }
850                         else if (flags & NETFLAG_ACK)
851                         {
852                                 if (sequence == (conn->sendSequence - 1))
853                                 {
854                                         if (sequence == conn->ackSequence)
855                                         {
856                                                 conn->ackSequence++;
857                                                 if (conn->ackSequence != conn->sendSequence)
858                                                         Con_DPrint("ack sequencing error\n");
859                                                 conn->lastMessageTime = realtime;
860                                                 conn->timeout = realtime + net_messagetimeout.value;
861                                                 conn->sendMessageLength -= MAX_PACKETFRAGMENT;
862                                                 if (conn->sendMessageLength > 0)
863                                                 {
864                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
865                                                         conn->sendNext = true;
866                                                         NetConn_SendMessageNext(conn);
867                                                 }
868                                                 else
869                                                 {
870                                                         conn->sendMessageLength = 0;
871                                                         conn->canSend = true;
872                                                 }
873                                         }
874                                         else
875                                                 Con_DPrint("Duplicate ACK received\n");
876                                 }
877                                 else
878                                         Con_DPrint("Stale ACK received\n");
879                                 return 1;
880                         }
881                         else if (flags & NETFLAG_DATA)
882                         {
883                                 unsigned int temppacket[2];
884                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
885                                 temppacket[1] = BigLong(sequence);
886                                 NetConn_Write(conn->mysocket, (unsigned char *)temppacket, 8, &conn->peeraddress);
887                                 if (sequence == conn->receiveSequence)
888                                 {
889                                         conn->lastMessageTime = realtime;
890                                         conn->timeout = realtime + net_messagetimeout.value;
891                                         conn->receiveSequence++;
892                                         if( conn->receiveMessageLength + length <= (int)sizeof( conn->receiveMessage ) ) {
893                                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
894                                                 conn->receiveMessageLength += length;
895                                         } else {
896                                                 Con_Printf( "Reliable message (seq: %i) too big for message buffer!\n"
897                                                                         "Dropping the message!\n", sequence );
898                                                 conn->receiveMessageLength = 0;
899                                                 return 1;
900                                         }
901                                         if (flags & NETFLAG_EOM)
902                                         {
903                                                 reliableMessagesReceived++;
904                                                 length = conn->receiveMessageLength;
905                                                 conn->receiveMessageLength = 0;
906                                                 if (length > 0)
907                                                 {
908                                                         SZ_Clear(&net_message);
909                                                         SZ_Write(&net_message, conn->receiveMessage, length);
910                                                         MSG_BeginReading();
911                                                         return 2;
912                                                 }
913                                         }
914                                 }
915                                 else
916                                         receivedDuplicateCount++;
917                                 return 1;
918                         }
919                 }
920         }
921         return 0;
922 }
923
924 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
925 {
926         cls.connect_trying = false;
927         M_Update_Return_Reason("");
928         // the connection request succeeded, stop current connection and set up a new connection
929         CL_Disconnect();
930         // if we're connecting to a remote server, shut down any local server
931         if (LHNETADDRESS_GetAddressType(peeraddress) != LHNETADDRESSTYPE_LOOP && sv.active)
932                 Host_ShutdownServer (false);
933         // allocate a net connection to keep track of things
934         cls.netcon = NetConn_Open(mysocket, peeraddress);
935         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
936         key_dest = key_game;
937         m_state = m_none;
938         cls.demonum = -1;                       // not in the demo loop now
939         cls.state = ca_connected;
940         cls.signon = 0;                         // need all the signon messages before playing
941 }
942
943 int NetConn_IsLocalGame(void)
944 {
945         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
946                 return true;
947         return false;
948 }
949
950 int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
951 {
952         int ret, c, control;
953         const char *s;
954         char *string, addressstring2[128], cname[128], ipstring[32];
955         char stringbuf[16384];
956
957         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
958         {
959                 // received a command string - strip off the packaging and put it
960                 // into our string buffer with NULL termination
961                 data += 4;
962                 length -= 4;
963                 length = min(length, (int)sizeof(stringbuf) - 1);
964                 memcpy(stringbuf, data, length);
965                 stringbuf[length] = 0;
966                 string = stringbuf;
967
968                 if (developer.integer)
969                 {
970                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
971                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
972                         Com_HexDumpToConsole(data, length);
973                 }
974
975                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
976                 {
977                         char protocolnames[1400];
978                         Protocol_Names(protocolnames, sizeof(protocolnames));
979                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
980                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
981                         M_Update_Return_Reason("Got challenge response");
982                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\protocols\\%s\\challenge\\%s", protocolnames, string + 10), peeraddress);
983                         return true;
984                 }
985                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
986                 {
987                         M_Update_Return_Reason("Accepted");
988                         NetConn_ConnectionEstablished(mysocket, peeraddress);
989                         return true;
990                 }
991                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
992                 {
993                         char rejectreason[32];
994                         cls.connect_trying = false;
995                         string += 7;
996                         length = max(length - 7, (int)sizeof(rejectreason) - 1);
997                         memcpy(rejectreason, string, length);
998                         rejectreason[length] = 0;
999                         M_Update_Return_Reason(rejectreason);
1000                         return true;
1001                 }
1002                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1003                 {
1004                         serverlist_info_t *info;
1005                         int i, n;
1006                         double pingtime;
1007
1008                         string += 13;
1009                         // serverlist only uses text addresses
1010                         LHNETADDRESS_ToString(peeraddress, cname, sizeof(cname), true);
1011                         // search the cache for this server and update it
1012                         for( n = 0; n < serverlist_cachecount; n++ )
1013                                 if( !strcmp( cname, serverlist_cache[n].info.cname ) )
1014                                         break;
1015                         if( n == serverlist_cachecount ) {
1016                                 // LAN search doesnt require an answer from the master server so we wont
1017                                 // know the ping nor will it be initialized already...
1018
1019                                 // find a slot
1020                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1021                                         return true;
1022
1023                                 memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1024                                 // store the data the engine cares about (address and ping)
1025                                 strlcpy (serverlist_cache[serverlist_cachecount].info.cname, cname, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1026                                 serverlist_cache[serverlist_cachecount].info.ping = 100000;
1027                                 serverlist_cache[serverlist_cachecount].querytime = realtime;
1028                                 // if not in the slist menu we should print the server to console
1029                                 if (serverlist_consoleoutput) {
1030                                         Con_Printf("querying %s\n", ipstring);
1031                                 }
1032
1033                                 ++serverlist_cachecount;
1034                         }
1035
1036                         info = &serverlist_cache[n].info;
1037                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));else info->game[0] = 0;
1038                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1039                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1040                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1041                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);else info->protocol = -1;
1042                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);else info->numplayers = 0;
1043                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1044
1045                         if (info->ping == 100000)
1046                                         serverreplycount++;
1047
1048                         pingtime = (int)((realtime - serverlist_cache[n].querytime) * 1000.0);
1049                         pingtime = bound(0, pingtime, 9999);
1050                         // update the ping
1051                         info->ping = pingtime;
1052
1053                         // legacy/old stuff move it to the menu ASAP
1054
1055                         // build description strings for the things users care about
1056                         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);
1057                         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);
1058                         // if ping is especially high, display it as such
1059                         if (pingtime >= 300)
1060                         {
1061                                 // orange numbers (lower block)
1062                                 for (i = 0;i < 5;i++)
1063                                         if (serverlist_cache[n].line1[i] != ' ')
1064                                                 serverlist_cache[n].line1[i] += 128;
1065                         }
1066                         else if (pingtime >= 200)
1067                         {
1068                                 // yellow numbers (in upper block)
1069                                 for (i = 0;i < 5;i++)
1070                                         if (serverlist_cache[n].line1[i] != ' ')
1071                                                 serverlist_cache[n].line1[i] -= 30;
1072                         }
1073                         if( serverlist_cache[n].query == SQS_QUERIED ) {
1074                                 ServerList_ViewList_Remove( &serverlist_cache[n] );
1075                         }
1076                         // if not in the slist menu we should print the server to console (if wanted)
1077                         else if( serverlist_consoleoutput )
1078                                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1079                         // and finally, update the view set
1080                         ServerList_ViewList_Insert( &serverlist_cache[n] );
1081                         serverlist_cache[n].query = SQS_QUERIED;
1082
1083                         return true;
1084                 }
1085                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1086                 {
1087                         // Extract the IP addresses
1088                         data += 18;
1089                         length -= 18;
1090                         masterreplycount++;
1091                         if (serverlist_consoleoutput)
1092                                 Con_Print("received server list...\n");
1093                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
1094                         {
1095                                 int n;
1096
1097                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], (data[5] << 8) | data[6]);
1098                                 if (developer.integer)
1099                                         Con_Printf("Requesting info from server %s\n", ipstring);
1100                                 // ignore the rest of the message if the serverlist is full
1101                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1102                                         break;
1103                                 // also ignore it if we have already queried it (other master server response)
1104                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1105                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1106                                                 break;
1107                                 if( n >= serverlist_cachecount )
1108                                 {
1109                                         serverquerycount++;
1110
1111                                         memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1112                                         // store the data the engine cares about (address and ping)
1113                                         strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1114                                         serverlist_cache[serverlist_cachecount].info.ping = 100000;
1115                                         serverlist_cache[serverlist_cachecount].query = SQS_QUERYING;
1116
1117                                         ++serverlist_cachecount;
1118                                 }
1119
1120                                 // move on to next address in packet
1121                                 data += 7;
1122                                 length -= 7;
1123                         }
1124                         // begin or resume serverlist queries
1125                         serverlist_querysleep = false;
1126                         return true;
1127                 }
1128                 /*
1129                 if (!strncmp(string, "ping", 4))
1130                 {
1131                         if (developer.integer)
1132                                 Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1133                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1134                         return true;
1135                 }
1136                 if (!strncmp(string, "ack", 3))
1137                         return true;
1138                 */
1139                 // we may not have liked the packet, but it was a command packet, so
1140                 // we're done processing this packet now
1141                 return true;
1142         }
1143         // netquake control packets, supported for compatibility only
1144         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1145         {
1146                 c = data[4];
1147                 data += 5;
1148                 length -= 5;
1149                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1150                 switch (c)
1151                 {
1152                 case CCREP_ACCEPT:
1153                         if (developer.integer)
1154                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
1155                         if (cls.connect_trying)
1156                         {
1157                                 lhnetaddress_t clientportaddress;
1158                                 clientportaddress = *peeraddress;
1159                                 if (length >= 4)
1160                                 {
1161                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
1162                                         data += 4;
1163                                         length -= 4;
1164                                         LHNETADDRESS_SetPort(&clientportaddress, port);
1165                                 }
1166                                 M_Update_Return_Reason("Accepted");
1167                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress);
1168                         }
1169                         break;
1170                 case CCREP_REJECT:
1171                         if (developer.integer)
1172                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1173                         cls.connect_trying = false;
1174                         M_Update_Return_Reason((char *)data);
1175                         break;
1176 #if 0
1177                 case CCREP_SERVER_INFO:
1178                         if (developer.integer)
1179                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1180                         if (cls.state != ca_dedicated)
1181                         {
1182                                 // LordHavoc: because the UDP driver reports 0.0.0.0:26000 as the address
1183                                 // string we just ignore it and keep the real address
1184                                 MSG_ReadString();
1185                                 // serverlist only uses text addresses
1186                                 cname = UDP_AddrToString(readaddr);
1187                                 // search the cache for this server
1188                                 for (n = 0; n < hostCacheCount; n++)
1189                                         if (!strcmp(cname, serverlist[n].cname))
1190                                                 break;
1191                                 // add it
1192                                 if (n == hostCacheCount && hostCacheCount < SERVERLISTSIZE)
1193                                 {
1194                                         hostCacheCount++;
1195                                         memset(&serverlist[n], 0, sizeof(serverlist[n]));
1196                                         strlcpy (serverlist[n].name, MSG_ReadString(), sizeof (serverlist[n].name));
1197                                         strlcpy (serverlist[n].map, MSG_ReadString(), sizeof (serverlist[n].map));
1198                                         serverlist[n].users = MSG_ReadByte();
1199                                         serverlist[n].maxusers = MSG_ReadByte();
1200                                         c = MSG_ReadByte();
1201                                         if (c != NET_PROTOCOL_VERSION)
1202                                         {
1203                                                 strlcpy (serverlist[n].cname, serverlist[n].name, sizeof (serverlist[n].cname));
1204                                                 strcpy(serverlist[n].name, "*");
1205                                                 strlcat (serverlist[n].name, serverlist[n].cname, sizeof(serverlist[n].name));
1206                                         }
1207                                         strlcpy (serverlist[n].cname, cname, sizeof (serverlist[n].cname));
1208                                 }
1209                         }
1210                         break;
1211                 case CCREP_PLAYER_INFO:
1212                         // we got a CCREP_PLAYER_INFO??
1213                         //if (developer.integer)
1214                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1215                         break;
1216                 case CCREP_RULE_INFO:
1217                         // we got a CCREP_RULE_INFO??
1218                         //if (developer.integer)
1219                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1220                         break;
1221 #endif
1222                 default:
1223                         break;
1224                 }
1225                 // we may not have liked the packet, but it was a valid control
1226                 // packet, so we're done processing this packet now
1227                 return true;
1228         }
1229         ret = 0;
1230         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)
1231                 CL_ParseServerMessage();
1232         return ret;
1233 }
1234
1235 void NetConn_QueryQueueFrame(void)
1236 {
1237         int index;
1238         int queries;
1239         int maxqueries;
1240         double timeouttime;
1241         static double querycounter = 0;
1242
1243         if (serverlist_querysleep)
1244                 return;
1245
1246         // each time querycounter reaches 1.0 issue a query
1247         querycounter += host_realframetime * net_slist_queriespersecond.value;
1248         maxqueries = (int)querycounter;
1249         maxqueries = bound(0, maxqueries, net_slist_queriesperframe.integer);
1250         querycounter -= maxqueries;
1251
1252         if( maxqueries == 0 ) {
1253                 return;
1254         }
1255
1256         // scan serverlist and issue queries as needed
1257     serverlist_querysleep = true;
1258
1259         timeouttime = realtime - net_slist_timeout.value;
1260         for( index = 0, queries = 0 ; index < serverlist_cachecount && queries < maxqueries ; index++ )
1261         {
1262                 serverlist_entry_t *entry = &serverlist_cache[ index ];
1263                 if( entry->query != SQS_QUERYING )
1264                 {
1265                         continue;
1266                 }
1267
1268         serverlist_querysleep = false;
1269                 if( entry->querycounter != 0 && entry->querytime > timeouttime )
1270                 {
1271                         continue;
1272                 }
1273
1274                 if( entry->querycounter != (unsigned) net_slist_maxtries.integer )
1275                 {
1276                         lhnetaddress_t address;
1277                         int socket;
1278
1279                         LHNETADDRESS_FromString(&address, entry->info.cname, 0);
1280                         for (socket = 0; socket < cl_numsockets ; socket++) {
1281                                 NetConn_WriteString(cl_sockets[socket], "\377\377\377\377getinfo", &address);
1282                         }
1283
1284                         entry->querytime = realtime;
1285                         entry->querycounter++;
1286
1287                         // if not in the slist menu we should print the server to console
1288                         if (serverlist_consoleoutput)
1289                                 Con_Printf("querying %25s (%i. try)\n", entry->info.cname, entry->querycounter);
1290
1291                         queries++;
1292                 }
1293                 else
1294                 {
1295                         entry->query = SQS_TIMEDOUT;
1296                 }
1297         }
1298 }
1299
1300 void NetConn_ClientFrame(void)
1301 {
1302         int i, length;
1303         lhnetaddress_t peeraddress;
1304         netconn_t *conn;
1305         NetConn_UpdateServerStuff();
1306         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
1307         {
1308                 if (cls.connect_remainingtries == 0)
1309                         M_Update_Return_Reason("Connect: Waiting 10 seconds for reply");
1310                 cls.connect_nextsendtime = realtime + 1;
1311                 cls.connect_remainingtries--;
1312                 if (cls.connect_remainingtries <= -10)
1313                 {
1314                         cls.connect_trying = false;
1315                         M_Update_Return_Reason("Connect: Failed");
1316                         return;
1317                 }
1318                 // try challenge first (newer server)
1319                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
1320                 // then try netquake as a fallback (old server, or netquake)
1321                 SZ_Clear(&net_message);
1322                 // save space for the header, filled in later
1323                 MSG_WriteLong(&net_message, 0);
1324                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
1325                 MSG_WriteString(&net_message, "QUAKE");
1326                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1327                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1328                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
1329                 SZ_Clear(&net_message);
1330         }
1331         for (i = 0;i < cl_numsockets;i++) {
1332                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0) {
1333                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
1334                 }
1335         }
1336         NetConn_QueryQueueFrame();
1337         if (cls.netcon && realtime > cls.netcon->timeout)
1338         {
1339                 Con_Print("Connection timed out\n");
1340                 CL_Disconnect();
1341                 Host_ShutdownServer (false);
1342         }
1343         for (conn = netconn_list;conn;conn = conn->next)
1344                 NetConn_ReSendMessage(conn);
1345 }
1346
1347 #define MAX_CHALLENGES 128
1348 struct challenge_s
1349 {
1350         lhnetaddress_t address;
1351         double time;
1352         char string[12];
1353 }
1354 challenge[MAX_CHALLENGES];
1355
1356 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
1357 {
1358         int i;
1359         char c;
1360         for (i = 0;i < bufferlength - 1;i++)
1361         {
1362                 do
1363                 {
1364                         c = rand () % (127 - 33) + 33;
1365                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
1366                 buffer[i] = c;
1367         }
1368         buffer[i] = 0;
1369 }
1370
1371 static qboolean NetConn_BuildStatusResponse(const char* challenge, char* out_msg, size_t out_size, qboolean fullstatus)
1372 {
1373         unsigned int nb_clients = 0, i;
1374         int length;
1375
1376         // How many clients are there?
1377         for (i = 0;i < (unsigned int)svs.maxclients;i++)
1378                 if (svs.clients[i].active)
1379                         nb_clients++;
1380
1381         // TODO: we should add more information for the full status string
1382         length = dpsnprintf(out_msg, out_size,
1383                                                 "\377\377\377\377%s\x0A"
1384                                                 "\\gamename\\%s\\modname\\%s\\sv_maxclients\\%d"
1385                                                 "\\clients\\%d\\mapname\\%s\\hostname\\%s""\\protocol\\%d"
1386                                                 "%s%s"
1387                                                 "%s",
1388                                                 fullstatus ? "statusResponse" : "infoResponse",
1389                                                 gamename, com_modname, svs.maxclients,
1390                                                 nb_clients, sv.name, hostname.string, NET_PROTOCOL_VERSION,
1391                                                 challenge ? "\\challenge\\" : "", challenge ? challenge : "",
1392                                                 fullstatus ? "\n" : "");
1393
1394         // Make sure it fits in the buffer
1395         if (length < 0)
1396                 return false;
1397
1398         if (fullstatus)
1399         {
1400                 char *ptr;
1401                 int left;
1402
1403                 ptr = out_msg + length;
1404                 left = (int)out_size - length;
1405
1406                 for (i = 0;i < (unsigned int)svs.maxclients;i++)
1407                 {
1408                         client_t *cl = &svs.clients[i];
1409                         if (cl->active)
1410                         {
1411                                 int nameind, cleanind;
1412                                 char curchar;
1413                                 char cleanname [sizeof(cl->name)];
1414
1415                                 // Remove all characters '"' and '\' in the player name
1416                                 nameind = 0;
1417                                 cleanind = 0;
1418                                 do
1419                                 {
1420                                         curchar = cl->name[nameind++];
1421                                         if (curchar != '"' && curchar != '\\')
1422                                         {
1423                                                 cleanname[cleanind++] = curchar;
1424                                                 if (cleanind == sizeof(cleanname) - 1)
1425                                                         break;
1426                                         }
1427                                 } while (curchar != '\0');
1428
1429                                 length = dpsnprintf(ptr, left, "%d %d \"%s\"\n",
1430                                                                         cl->frags,
1431                                                                         (int)(cl->ping * 1000.0f),
1432                                                                         cleanname);
1433                                 if(length < 0)
1434                                         return false;
1435                                 left -= length;
1436                                 ptr += length;
1437                         }
1438                 }
1439         }
1440
1441         return true;
1442 }
1443
1444 extern void SV_SendServerinfo (client_t *client);
1445 int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1446 {
1447         int i, ret, clientnum, best;
1448         double besttime;
1449         client_t *client;
1450         netconn_t *conn;
1451         char *s, *string, response[512], addressstring2[128], stringbuf[16384];
1452
1453         if (sv.active)
1454         {
1455                 if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1456                 {
1457                         // received a command string - strip off the packaging and put it
1458                         // into our string buffer with NULL termination
1459                         data += 4;
1460                         length -= 4;
1461                         length = min(length, (int)sizeof(stringbuf) - 1);
1462                         memcpy(stringbuf, data, length);
1463                         stringbuf[length] = 0;
1464                         string = stringbuf;
1465
1466                         if (developer.integer)
1467                         {
1468                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1469                                 Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1470                                 Com_HexDumpToConsole(data, length);
1471                         }
1472
1473                         if (length >= 12 && !memcmp(string, "getchallenge", 12))
1474                         {
1475                                 for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1476                                 {
1477                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1478                                                 break;
1479                                         if (besttime > challenge[i].time)
1480                                                 besttime = challenge[best = i].time;
1481                                 }
1482                                 // if we did not find an exact match, choose the oldest and
1483                                 // update address and string
1484                                 if (i == MAX_CHALLENGES)
1485                                 {
1486                                         i = best;
1487                                         challenge[i].address = *peeraddress;
1488                                         NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1489                                 }
1490                                 challenge[i].time = realtime;
1491                                 // send the challenge
1492                                 NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1493                                 return true;
1494                         }
1495                         if (length > 8 && !memcmp(string, "connect\\", 8))
1496                         {
1497                                 string += 7;
1498                                 length -= 7;
1499                                 if ((s = SearchInfostring(string, "challenge")))
1500                                 {
1501                                         // validate the challenge
1502                                         for (i = 0;i < MAX_CHALLENGES;i++)
1503                                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1504                                                         break;
1505                                         if (i < MAX_CHALLENGES)
1506                                         {
1507                                                 // check engine protocol
1508                                                 if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1509                                                 {
1510                                                         if (developer.integer)
1511                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1512                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1513                                                 }
1514                                                 else
1515                                                 {
1516                                                         // see if this is a duplicate connection request
1517                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1518                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1519                                                                         break;
1520                                                         if (clientnum < svs.maxclients && realtime - client->connecttime < net_messagerejointimeout.value)
1521                                                         {
1522                                                                 // client is still trying to connect,
1523                                                                 // so we send a duplicate reply
1524                                                                 if (developer.integer)
1525                                                                         Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1526                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1527                                                         }
1528 #if 0
1529                                                         else if (clientnum < svs.maxclients)
1530                                                         {
1531                                                                 if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1532                                                                 {
1533                                                                         // client crashed and is coming back, keep their stuff intact
1534                                                                         SV_SendServerinfo(client);
1535                                                                         //host_client = client;
1536                                                                         //SV_DropClient (true);
1537                                                                 }
1538                                                                 // else ignore them
1539                                                         }
1540 #endif
1541                                                         else
1542                                                         {
1543                                                                 // this is a new client, find a slot
1544                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1545                                                                         if (!client->active)
1546                                                                                 break;
1547                                                                 if (clientnum < svs.maxclients)
1548                                                                 {
1549                                                                         // prepare the client struct
1550                                                                         if ((conn = NetConn_Open(mysocket, peeraddress)))
1551                                                                         {
1552                                                                                 // allocated connection
1553                                                                                 LHNETADDRESS_ToString(peeraddress, conn->address, sizeof(conn->address), true);
1554                                                                                 if (developer.integer)
1555                                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1556                                                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1557                                                                                 // now set up the client
1558                                                                                 SV_ConnectClient(clientnum, conn);
1559                                                                                 NetConn_Heartbeat(1);
1560                                                                         }
1561                                                                 }
1562                                                                 else
1563                                                                 {
1564                                                                         // server is full
1565                                                                         if (developer.integer)
1566                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1567                                                                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1568                                                                 }
1569                                                         }
1570                                                 }
1571                                         }
1572                                 }
1573                                 return true;
1574                         }
1575                         if (length >= 7 && !memcmp(string, "getinfo", 7))
1576                         {
1577                                 const char *challenge = NULL;
1578
1579                                 // If there was a challenge in the getinfo message
1580                                 if (length > 8 && string[7] == ' ')
1581                                         challenge = string + 8;
1582
1583                                 if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), false))
1584                                 {
1585                                         if (developer.integer)
1586                                                 Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1587                                         NetConn_WriteString(mysocket, response, peeraddress);
1588                                 }
1589                                 return true;
1590                         }
1591                         if (length >= 9 && !memcmp(string, "getstatus", 9))
1592                         {
1593                                 const char *challenge = NULL;
1594
1595                                 // If there was a challenge in the getinfo message
1596                                 if (length > 10 && string[9] == ' ')
1597                                         challenge = string + 10;
1598
1599                                 if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), true))
1600                                 {
1601                                         if (developer.integer)
1602                                                 Con_Printf("Sending reply to client %s - %s\n", addressstring2, response);
1603                                         NetConn_WriteString(mysocket, response, peeraddress);
1604                                 }
1605                                 return true;
1606                         }
1607                         /*
1608                         if (!strncmp(string, "ping", 4))
1609                         {
1610                                 if (developer.integer)
1611                                         Con_Printf("Received ping from %s, sending ack\n", UDP_AddrToString(readaddr));
1612                                 NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1613                                 return true;
1614                         }
1615                         if (!strncmp(string, "ack", 3))
1616                                 return true;
1617                         */
1618                         // we may not have liked the packet, but it was a command packet, so
1619                         // we're done processing this packet now
1620                         return true;
1621                 }
1622                 // LordHavoc: disabled netquake control packet support in server
1623 #if 0
1624                 {
1625                         int c, control;
1626                         // netquake control packets, supported for compatibility only
1627                         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1628                         {
1629                                 c = data[4];
1630                                 data += 5;
1631                                 length -= 5;
1632                                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1633                                 switch (c)
1634                                 {
1635                                 case CCREQ_CONNECT:
1636                                         //if (developer.integer)
1637                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1638                                         if (length >= (int)strlen("QUAKE") + 1 + 1)
1639                                         {
1640                                                 if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1641                                                 {
1642                                                         if (developer.integer)
1643                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1644                                                         SZ_Clear(&net_message);
1645                                                         // save space for the header, filled in later
1646                                                         MSG_WriteLong(&net_message, 0);
1647                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1648                                                         MSG_WriteString(&net_message, "Incompatible version.\n");
1649                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1650                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1651                                                         SZ_Clear(&net_message);
1652                                                 }
1653                                                 else
1654                                                 {
1655                                                         // see if this is a duplicate connection request
1656                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1657                                                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1658                                                                         break;
1659                                                         if (clientnum < svs.maxclients)
1660                                                         {
1661                                                                 // duplicate connection request
1662                                                                 if (realtime - client->connecttime < 2.0)
1663                                                                 {
1664                                                                         // client is still trying to connect,
1665                                                                         // so we send a duplicate reply
1666                                                                         if (developer.integer)
1667                                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1668                                                                         SZ_Clear(&net_message);
1669                                                                         // save space for the header, filled in later
1670                                                                         MSG_WriteLong(&net_message, 0);
1671                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1672                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1673                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1674                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1675                                                                         SZ_Clear(&net_message);
1676                                                                 }
1677 #if 0
1678                                                                 else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1679                                                                 {
1680                                                                         SV_SendServerinfo(client);
1681                                                                         // the old client hasn't sent us anything
1682                                                                         // in quite a while, so kick off and let
1683                                                                         // the retry take care of it...
1684                                                                         //host_client = client;
1685                                                                         //SV_DropClient (true);
1686                                                                 }
1687 #endif
1688                                                         }
1689                                                         else
1690                                                         {
1691                                                                 // this is a new client, find a slot
1692                                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1693                                                                         if (!client->active)
1694                                                                                 break;
1695                                                                 if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
1696                                                                 {
1697                                                                         // connect to the client
1698                                                                         // everything is allocated, just fill in the details
1699                                                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
1700                                                                         if (developer.integer)
1701                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
1702                                                                         // send back the info about the server connection
1703                                                                         SZ_Clear(&net_message);
1704                                                                         // save space for the header, filled in later
1705                                                                         MSG_WriteLong(&net_message, 0);
1706                                                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
1707                                                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
1708                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1709                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1710                                                                         SZ_Clear(&net_message);
1711                                                                         // now set up the client struct
1712                                                                         SV_ConnectClient(clientnum, conn);
1713                                                                         NetConn_Heartbeat(1);
1714                                                                 }
1715                                                                 else
1716                                                                 {
1717                                                                         //if (developer.integer)
1718                                                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
1719                                                                         // no room; try to let player know
1720                                                                         SZ_Clear(&net_message);
1721                                                                         // save space for the header, filled in later
1722                                                                         MSG_WriteLong(&net_message, 0);
1723                                                                         MSG_WriteByte(&net_message, CCREP_REJECT);
1724                                                                         MSG_WriteString(&net_message, "Server is full.\n");
1725                                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1726                                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1727                                                                         SZ_Clear(&net_message);
1728                                                                 }
1729                                                         }
1730                                                 }
1731                                         }
1732                                         break;
1733 #if 0
1734                                 case CCREQ_SERVER_INFO:
1735                                         if (developer.integer)
1736                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
1737                                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
1738                                         {
1739                                                 if (developer.integer)
1740                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
1741                                                 SZ_Clear(&net_message);
1742                                                 // save space for the header, filled in later
1743                                                 MSG_WriteLong(&net_message, 0);
1744                                                 MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
1745                                                 UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
1746                                                 MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
1747                                                 MSG_WriteString(&net_message, hostname.string);
1748                                                 MSG_WriteString(&net_message, sv.name);
1749                                                 MSG_WriteByte(&net_message, net_activeconnections);
1750                                                 MSG_WriteByte(&net_message, svs.maxclients);
1751                                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1752                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1753                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1754                                                 SZ_Clear(&net_message);
1755                                         }
1756                                         break;
1757                                 case CCREQ_PLAYER_INFO:
1758                                         if (developer.integer)
1759                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
1760                                         if (sv.active)
1761                                         {
1762                                                 int playerNumber, activeNumber, clientNumber;
1763                                                 client_t *client;
1764
1765                                                 playerNumber = MSG_ReadByte();
1766                                                 activeNumber = -1;
1767                                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
1768                                                         if (client->active && ++activeNumber == playerNumber)
1769                                                                 break;
1770                                                 if (clientNumber != svs.maxclients)
1771                                                 {
1772                                                         SZ_Clear(&net_message);
1773                                                         // save space for the header, filled in later
1774                                                         MSG_WriteLong(&net_message, 0);
1775                                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
1776                                                         MSG_WriteByte(&net_message, playerNumber);
1777                                                         MSG_WriteString(&net_message, client->name);
1778                                                         MSG_WriteLong(&net_message, client->colors);
1779                                                         MSG_WriteLong(&net_message, (int)client->edict->fields.server->frags);
1780                                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
1781                                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
1782                                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1783                                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1784                                                         SZ_Clear(&net_message);
1785                                                 }
1786                                         }
1787                                         break;
1788                                 case CCREQ_RULE_INFO:
1789                                         if (developer.integer)
1790                                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
1791                                         if (sv.active)
1792                                         {
1793                                                 char *prevCvarName;
1794                                                 cvar_t *var;
1795
1796                                                 // find the search start location
1797                                                 prevCvarName = MSG_ReadString();
1798                                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
1799
1800                                                 // send the response
1801                                                 SZ_Clear(&net_message);
1802                                                 // save space for the header, filled in later
1803                                                 MSG_WriteLong(&net_message, 0);
1804                                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
1805                                                 if (var)
1806                                                 {
1807                                                         MSG_WriteString(&net_message, var->name);
1808                                                         MSG_WriteString(&net_message, var->string);
1809                                                 }
1810                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1811                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1812                                                 SZ_Clear(&net_message);
1813                                         }
1814                                         break;
1815 #endif
1816                                 default:
1817                                         break;
1818                                 }
1819                                 // we may not have liked the packet, but it was a valid control
1820                                 // packet, so we're done processing this packet now
1821                                 return true;
1822                         }
1823                 }
1824 #endif
1825                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1826                 {
1827                         if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1828                         {
1829                                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length)) == 2)
1830                                         SV_ReadClientMessage();
1831                                 return ret;
1832                         }
1833                 }
1834         }
1835         return 0;
1836 }
1837
1838 void NetConn_ServerFrame(void)
1839 {
1840         int i, length;
1841         lhnetaddress_t peeraddress;
1842         netconn_t *conn;
1843         NetConn_UpdateServerStuff();
1844         for (i = 0;i < sv_numsockets;i++)
1845                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1846                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
1847         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1848         {
1849                 // never timeout loopback connections
1850                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
1851                 {
1852                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
1853                         SV_DropClient(false);
1854                 }
1855         }
1856         for (conn = netconn_list;conn;conn = conn->next)
1857                 NetConn_ReSendMessage(conn);
1858 }
1859
1860 void NetConn_QueryMasters(void)
1861 {
1862         int i;
1863         int masternum;
1864         lhnetaddress_t masteraddress;
1865         lhnetaddress_t broadcastaddress;
1866         char request[256];
1867
1868         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
1869                 return;
1870
1871         // 26000 is the default quake server port, servers on other ports will not
1872         // be found
1873         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
1874         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
1875
1876         for (i = 0;i < cl_numsockets;i++)
1877         {
1878                 if (cl_sockets[i])
1879                 {
1880                         // search LAN for Quake servers
1881                         SZ_Clear(&net_message);
1882                         // save space for the header, filled in later
1883                         MSG_WriteLong(&net_message, 0);
1884                         MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
1885                         MSG_WriteString(&net_message, "QUAKE");
1886                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1887                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1888                         NetConn_Write(cl_sockets[i], net_message.data, net_message.cursize, &broadcastaddress);
1889                         SZ_Clear(&net_message);
1890
1891                         // search LAN for DarkPlaces servers
1892                         NetConn_WriteString(cl_sockets[i], "\377\377\377\377getinfo", &broadcastaddress);
1893
1894                         // build the getservers message to send to the master servers
1895                         dpsnprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
1896
1897                         // search internet
1898                         for (masternum = 0;sv_masters[masternum].name;masternum++)
1899                         {
1900                                 if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
1901                                 {
1902                                         masterquerycount++;
1903                                         NetConn_WriteString(cl_sockets[i], request, &masteraddress);
1904                                 }
1905                         }
1906                 }
1907         }
1908         if (!masterquerycount)
1909         {
1910                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
1911                 M_Update_Return_Reason("No network");
1912         }
1913 }
1914
1915 void NetConn_Heartbeat(int priority)
1916 {
1917         lhnetaddress_t masteraddress;
1918         int masternum;
1919         lhnetsocket_t *mysocket;
1920
1921         // if it's a state change (client connected), limit next heartbeat to no
1922         // more than 30 sec in the future
1923         if (priority == 1 && nextheartbeattime > realtime + 30.0)
1924                 nextheartbeattime = realtime + 30.0;
1925
1926         // limit heartbeatperiod to 30 to 270 second range,
1927         // lower limit is to avoid abusing master servers with excess traffic,
1928         // upper limit is to avoid timing out on the master server (which uses
1929         // 300 sec timeout)
1930         if (sv_heartbeatperiod.value < 30)
1931                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
1932         if (sv_heartbeatperiod.value > 270)
1933                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
1934
1935         // make advertising optional and don't advertise singleplayer games, and
1936         // only send a heartbeat as often as the admin wants
1937         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
1938         {
1939                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
1940                 for (masternum = 0;sv_masters[masternum].name;masternum++)
1941                         if (sv_masters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, MASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
1942                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
1943         }
1944 }
1945
1946 int NetConn_SendToAll(sizebuf_t *data, double blocktime)
1947 {
1948         int i, count = 0;
1949         unsigned char sent[MAX_SCOREBOARD];
1950
1951         memset(sent, 0, sizeof(sent));
1952
1953         // simultaneously wait for the first CanSendMessage and send the message,
1954         // then wait for a second CanSendMessage (verifying it was received), or
1955         // the client drops and is no longer counted
1956         // the loop aborts when either it runs out of clients to send to, or a
1957         // timeout expires
1958         blocktime += Sys_DoubleTime();
1959         do
1960         {
1961                 count = 0;
1962                 NetConn_ClientFrame();
1963                 NetConn_ServerFrame();
1964                 for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1965                 {
1966                         if (host_client->netconnection)
1967                         {
1968                                 if (NetConn_CanSendMessage(host_client->netconnection))
1969                                 {
1970                                         if (!sent[i])
1971                                                 NetConn_SendReliableMessage(host_client->netconnection, data);
1972                                         sent[i] = true;
1973                                 }
1974                                 if (!NetConn_CanSendMessage(host_client->netconnection))
1975                                         count++;
1976                         }
1977                 }
1978         }
1979         while (count && Sys_DoubleTime() < blocktime);
1980         return count;
1981 }
1982
1983 static void Net_Heartbeat_f(void)
1984 {
1985         if (sv.active)
1986                 NetConn_Heartbeat(2);
1987         else
1988                 Con_Print("No server running, can not heartbeat to master server.\n");
1989 }
1990
1991 void PrintStats(netconn_t *conn)
1992 {
1993         Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, conn->canSend, conn->sendSequence, conn->receiveSequence);
1994 }
1995
1996 void Net_Stats_f(void)
1997 {
1998         netconn_t *conn;
1999         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
2000         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
2001         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
2002         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
2003         Con_Printf("packetsSent                = %i\n", packetsSent);
2004         Con_Printf("packetsReSent              = %i\n", packetsReSent);
2005         Con_Printf("packetsReceived            = %i\n", packetsReceived);
2006         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
2007         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
2008         Con_Print("connections                =\n");
2009         for (conn = netconn_list;conn;conn = conn->next)
2010                 PrintStats(conn);
2011 }
2012
2013 void Net_Slist_f(void)
2014 {
2015         ServerList_ResetMasks();
2016         serverlist_sortbyfield = SLIF_PING;
2017         serverlist_sortdescending = false;
2018     if (m_state != m_slist) {
2019                 Con_Print("Sending requests to master servers\n");
2020                 ServerList_QueryList();
2021                 serverlist_consoleoutput = true;
2022                 Con_Print("Listening for replies...\n");
2023         } else
2024                 ServerList_QueryList();
2025 }
2026
2027 void NetConn_Init(void)
2028 {
2029         int i;
2030         lhnetaddress_t tempaddress;
2031         netconn_mempool = Mem_AllocPool("network connections", 0, NULL);
2032         Cmd_AddCommand("net_stats", Net_Stats_f);
2033         Cmd_AddCommand("net_slist", Net_Slist_f);
2034         Cmd_AddCommand("heartbeat", Net_Heartbeat_f);
2035         Cvar_RegisterVariable(&net_slist_queriespersecond);
2036         Cvar_RegisterVariable(&net_slist_queriesperframe);
2037         Cvar_RegisterVariable(&net_slist_timeout);
2038         Cvar_RegisterVariable(&net_slist_maxtries);
2039         Cvar_RegisterVariable(&net_messagetimeout);
2040         Cvar_RegisterVariable(&net_messagerejointimeout);
2041         Cvar_RegisterVariable(&net_connecttimeout);
2042         Cvar_RegisterVariable(&cl_netlocalping);
2043         Cvar_RegisterVariable(&cl_netpacketloss);
2044         Cvar_RegisterVariable(&hostname);
2045         Cvar_RegisterVariable(&developer_networking);
2046         Cvar_RegisterVariable(&cl_netport);
2047         Cvar_RegisterVariable(&sv_netport);
2048         Cvar_RegisterVariable(&net_address);
2049         //Cvar_RegisterVariable(&net_address_ipv6);
2050         Cvar_RegisterVariable(&sv_public);
2051         Cvar_RegisterVariable(&sv_heartbeatperiod);
2052         for (i = 0;sv_masters[i].name;i++)
2053                 Cvar_RegisterVariable(&sv_masters[i]);
2054 // 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.
2055         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
2056         {
2057                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
2058                 {
2059                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
2060                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
2061                 }
2062                 else
2063                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
2064         }
2065 // 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
2066         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
2067         {
2068                 i = atoi(com_argv[i + 1]);
2069                 if (i >= 0 && i < 65536)
2070                 {
2071                         Con_Printf("-port option used, setting port cvar to %i\n", i);
2072                         Cvar_SetValueQuick(&sv_netport, i);
2073                 }
2074                 else
2075                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
2076         }
2077         cl_numsockets = 0;
2078         sv_numsockets = 0;
2079         net_message.data = net_message_buf;
2080         net_message.maxsize = sizeof(net_message_buf);
2081         net_message.cursize = 0;
2082         LHNET_Init();
2083 }
2084
2085 void NetConn_Shutdown(void)
2086 {
2087         NetConn_CloseClientPorts();
2088         NetConn_CloseServerPorts();
2089         LHNET_Shutdown();
2090 }
2091