check if master server address string is empty when sending heartbeats and master...
[divverent/darkplaces.git] / netconn.c
1 /*
2 Copyright (C) 1996-1997 Id Software, Inc.
3 Copyright (C) 2002 Mathieu Olivier
4 Copyright (C) 2003 Forest Hale
5
6 This program is free software; you can redistribute it and/or
7 modify it under the terms of the GNU General Public License
8 as published by the Free Software Foundation; either version 2
9 of the License, or (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14
15 See the GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
20
21 */
22
23 #include "quakedef.h"
24 #include "lhnet.h"
25
26 #define QWMASTER_PORT 27000
27 #define DPMASTER_PORT 27950
28
29 // note this defaults on for dedicated servers, off for listen servers
30 cvar_t sv_public = {0, "sv_public", "0", "advertises this server on the master server (so that players can find it in the server browser)"};
31 static cvar_t sv_heartbeatperiod = {CVAR_SAVE, "sv_heartbeatperiod", "120", "how often to send heartbeat in seconds (only used if sv_public is 1)"};
32
33 static cvar_t sv_masters [] =
34 {
35         {CVAR_SAVE, "sv_master1", "", "user-chosen master server 1"},
36         {CVAR_SAVE, "sv_master2", "", "user-chosen master server 2"},
37         {CVAR_SAVE, "sv_master3", "", "user-chosen master server 3"},
38         {CVAR_SAVE, "sv_master4", "", "user-chosen master server 4"},
39         {0, "sv_masterextra1", "ghdigital.com", "default master server 1 (admin: LordHavoc)"}, // admin: LordHavoc
40         {0, "sv_masterextra2", "dpmaster.deathmask.net", "default master server 2 (admin: Willis)"}, // admin: Willis
41         {0, "sv_masterextra3", "12.166.196.192", "default master server 3 (admin: Venim)"}, // admin: Venim
42         {0, "sv_masterextra4", "excalibur.nvg.ntnu.no", "default master server 4 (admin: tChr)"}, // admin: tChr
43         {0, NULL, NULL, NULL}
44 };
45
46 static cvar_t sv_qwmasters [] =
47 {
48         {CVAR_SAVE, "sv_qwmaster1", "", "user-chosen qwmaster server 1"},
49         {CVAR_SAVE, "sv_qwmaster2", "", "user-chosen qwmaster server 2"},
50         {CVAR_SAVE, "sv_qwmaster3", "", "user-chosen qwmaster server 3"},
51         {CVAR_SAVE, "sv_qwmaster4", "", "user-chosen qwmaster server 4"},
52         {0, "sv_qwmasterextra1", "192.246.40.37:27000", "id Limbo (admin: id Software)"},
53         {0, "sv_qwmasterextra2", "192.246.40.37:27002", "id CTF (admin: id Software)"},
54         {0, "sv_qwmasterextra3", "192.246.40.37:27003", "id TeamFortress (admin: id Software)"},
55         {0, "sv_qwmasterextra4", "192.246.40.37:27004", "id Miscilaneous (admin: id Software)"},
56         {0, "sv_qwmasterextra5", "192.246.40.37:27006", "id Deathmatch Only (admin: id Software)"},
57         {0, "sv_qwmasterextra6", "150.254.66.120:27000", "Poland's master server. (admin: unknown)"},
58         {0, "sv_qwmasterextra7", "62.112.145.129:27000", "Ocrana master server. (admin: unknown)"},
59         {0, "sv_qwmasterextra8", "master.edome.net", "edome master server. (admin: unknown)"},
60         {0, "sv_qwmasterextra9", "qwmaster.barrysworld.com", "barrysworld master server. (admin: unknown)"},
61         {0, "sv_qwmasterextra10", "qwmaster.ocrana.de:27000", "Ocrana2 master server. (admin: unknown)"},
62         {0, "sv_qwmasterextra11", "213.221.174.165:27000", "unknown1 master server. (admin: unknown)"},
63         {0, "sv_qwmasterextra12", "195.74.0.8", "unknown2 master server. (admin: unknown)"},
64         {0, "sv_qwmasterextra13", "204.182.161.2", "unknown3 master server. (admin: unknown)"},
65         {0, NULL, NULL, NULL}
66 };
67
68 static double nextheartbeattime = 0;
69
70 sizebuf_t net_message;
71 static unsigned char net_message_buf[NET_MAXMESSAGE];
72
73 cvar_t net_messagetimeout = {0, "net_messagetimeout","300", "drops players who have not sent any packets for this many seconds"};
74 cvar_t net_messagerejointimeout = {0, "net_messagerejointimeout","10", "give a player this much time in seconds to rejoin and continue playing (not losing frags and such)"};
75 cvar_t net_connecttimeout = {0, "net_connecttimeout","10", "after requesting a connection, the client must reply within this many seconds or be dropped (cuts down on connect floods)"};
76 cvar_t hostname = {CVAR_SAVE, "hostname", "UNNAMED", "server message to show in server browser"};
77 cvar_t developer_networking = {0, "developer_networking", "0", "prints all received and sent packets (recommended only for debugging)"};
78
79 cvar_t cl_netlocalping = {0, "cl_netlocalping","0", "lags local loopback connection by this much ping time (useful to play more fairly on your own server with people with higher pings)"};
80 static cvar_t cl_netpacketloss = {0, "cl_netpacketloss","0", "drops this percentage of packets (incoming and outgoing), useful for testing network protocol robustness (effects failing to start, sounds failing to play, etc)"};
81 static cvar_t net_slist_queriespersecond = {0, "net_slist_queriespersecond", "20", "how many server information requests to send per second"};
82 static cvar_t net_slist_queriesperframe = {0, "net_slist_queriesperframe", "4", "maximum number of server information requests to send each rendered frame (guards against low framerates causing problems)"};
83 static cvar_t net_slist_timeout = {0, "net_slist_timeout", "4", "how long to listen for a server information response before giving up"};
84 static cvar_t net_slist_maxtries = {0, "net_slist_maxtries", "3", "how many times to ask the same server for information (more times gives better ping reports but takes longer)"};
85
86 static cvar_t gameversion = {0, "gameversion", "0", "version of game data (mod-specific), when client and server gameversion mismatch in the server browser the server is shown as incompatible"};
87
88 /* statistic counters */
89 static int packetsSent = 0;
90 static int packetsReSent = 0;
91 static int packetsReceived = 0;
92 static int receivedDuplicateCount = 0;
93 static int droppedDatagrams = 0;
94
95 static int unreliableMessagesSent = 0;
96 static int unreliableMessagesReceived = 0;
97 static int reliableMessagesSent = 0;
98 static int reliableMessagesReceived = 0;
99
100 double masterquerytime = -1000;
101 int masterquerycount = 0;
102 int masterreplycount = 0;
103 int serverquerycount = 0;
104 int serverreplycount = 0;
105
106 // this is only false if there are still servers left to query
107 static qboolean serverlist_querysleep = true;
108 // this is pushed a second or two ahead of realtime whenever a master server
109 // reply is received, to avoid issuing queries while master replies are still
110 // flooding in (which would make a mess of the ping times)
111 static double serverlist_querywaittime = 0;
112
113 static unsigned char sendbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
114 static unsigned char readbuffer[NET_HEADERSIZE+NET_MAXMESSAGE];
115
116 static int cl_numsockets;
117 static lhnetsocket_t *cl_sockets[16];
118 static int sv_numsockets;
119 static lhnetsocket_t *sv_sockets[16];
120
121 netconn_t *netconn_list = NULL;
122 mempool_t *netconn_mempool = NULL;
123
124 cvar_t cl_netport = {0, "cl_port", "0", "forces client to use chosen port number if not 0"};
125 cvar_t sv_netport = {0, "port", "26000", "server port for players to connect to"};
126 cvar_t net_address = {0, "net_address", "0.0.0.0", "network address to open ports on"};
127 //cvar_t net_netaddress_ipv6 = {0, "net_address_ipv6", "[0:0:0:0:0:0:0:0]", "network address to open ipv6 ports on"};
128
129 // ServerList interface
130 serverlist_mask_t serverlist_andmasks[SERVERLIST_ANDMASKCOUNT];
131 serverlist_mask_t serverlist_ormasks[SERVERLIST_ORMASKCOUNT];
132
133 serverlist_infofield_t serverlist_sortbyfield;
134 qboolean serverlist_sortdescending;
135
136 int serverlist_viewcount = 0;
137 serverlist_entry_t *serverlist_viewlist[SERVERLIST_VIEWLISTSIZE];
138
139 int serverlist_cachecount;
140 serverlist_entry_t serverlist_cache[SERVERLIST_TOTALSIZE];
141
142 qboolean serverlist_consoleoutput;
143
144 // helper function to insert a value into the viewset
145 // spare entries will be removed
146 static void _ServerList_ViewList_Helper_InsertBefore( int index, serverlist_entry_t *entry )
147 {
148     int i;
149         if( serverlist_viewcount < SERVERLIST_VIEWLISTSIZE ) {
150                 i = serverlist_viewcount++;
151         } else {
152                 i = SERVERLIST_VIEWLISTSIZE - 1;
153         }
154
155         for( ; i > index ; i-- )
156                 serverlist_viewlist[ i ] = serverlist_viewlist[ i - 1 ];
157
158         serverlist_viewlist[index] = entry;
159 }
160
161 // we suppose serverlist_viewcount to be valid, ie > 0
162 static void _ServerList_ViewList_Helper_Remove( int index )
163 {
164         serverlist_viewcount--;
165         for( ; index < serverlist_viewcount ; index++ )
166                 serverlist_viewlist[index] = serverlist_viewlist[index + 1];
167 }
168
169 // returns true if A should be inserted before B
170 static qboolean _ServerList_Entry_Compare( serverlist_entry_t *A, serverlist_entry_t *B )
171 {
172         int result = 0; // > 0 if for numbers A > B and for text if A < B
173
174         switch( serverlist_sortbyfield ) {
175                 case SLIF_PING:
176                         result = A->info.ping - B->info.ping;
177                         break;
178                 case SLIF_MAXPLAYERS:
179                         result = A->info.maxplayers - B->info.maxplayers;
180                         break;
181                 case SLIF_NUMPLAYERS:
182                         result = A->info.numplayers - B->info.numplayers;
183                         break;
184                 case SLIF_PROTOCOL:
185                         result = A->info.protocol - B->info.protocol;
186                         break;
187                 case SLIF_CNAME:
188                         result = strcmp( B->info.cname, A->info.cname );
189                         break;
190                 case SLIF_GAME:
191                         result = strcmp( B->info.game, A->info.game );
192                         break;
193                 case SLIF_MAP:
194                         result = strcmp( B->info.map, A->info.map );
195                         break;
196                 case SLIF_MOD:
197                         result = strcmp( B->info.mod, A->info.mod );
198                         break;
199                 case SLIF_NAME:
200                         result = strcmp( B->info.name, A->info.name );
201                         break;
202                 default:
203                         Con_DPrint( "_ServerList_Entry_Compare: Bad serverlist_sortbyfield!\n" );
204                         break;
205         }
206
207         if( serverlist_sortdescending )
208                 return result > 0;
209         if (result != 0)
210                 return result < 0;
211         // if the chosen sort key is identical, sort by index
212         // (makes this a stable sort, so that later replies from servers won't
213         //  shuffle the servers around when they have the same ping)
214         return A < B;
215 }
216
217 static qboolean _ServerList_CompareInt( int A, serverlist_maskop_t op, int B )
218 {
219         // This should actually be done with some intermediate and end-of-function return
220         switch( op ) {
221                 case SLMO_LESS:
222                         return A < B;
223                 case SLMO_LESSEQUAL:
224                         return A <= B;
225                 case SLMO_EQUAL:
226                         return A == B;
227                 case SLMO_GREATER:
228                         return A > B;
229                 case SLMO_NOTEQUAL:
230                         return A != B;
231                 case SLMO_GREATEREQUAL:
232                 case SLMO_CONTAINS:
233                 case SLMO_NOTCONTAIN:
234                         return A >= B;
235                 default:
236                         Con_DPrint( "_ServerList_CompareInt: Bad op!\n" );
237                         return false;
238         }
239 }
240
241 static qboolean _ServerList_CompareStr( const char *A, serverlist_maskop_t op, const char *B )
242 {
243         int i;
244         char bufferA[ 256 ], bufferB[ 256 ]; // should be more than enough
245         for (i = 0;i < (int)sizeof(bufferA)-1 && A[i];i++)
246                 bufferA[i] = (A[i] >= 'A' && A[i] <= 'Z') ? (A[i] + 'a' - 'A') : A[i];
247         bufferA[i] = 0;
248         for (i = 0;i < (int)sizeof(bufferB)-1 && B[i];i++)
249                 bufferB[i] = (B[i] >= 'A' && B[i] <= 'Z') ? (B[i] + 'a' - 'A') : B[i];
250         bufferB[i] = 0;
251
252         // Same here, also using an intermediate & final return would be more appropriate
253         // A info B mask
254         switch( op ) {
255                 case SLMO_CONTAINS:
256                         return *bufferB && !!strstr( bufferA, bufferB ); // we want a real bool
257                 case SLMO_NOTCONTAIN:
258                         return !*bufferB || !strstr( bufferA, bufferB );
259                 case SLMO_LESS:
260                         return strcmp( bufferA, bufferB ) < 0;
261                 case SLMO_LESSEQUAL:
262                         return strcmp( bufferA, bufferB ) <= 0;
263                 case SLMO_EQUAL:
264                         return strcmp( bufferA, bufferB ) == 0;
265                 case SLMO_GREATER:
266                         return strcmp( bufferA, bufferB ) > 0;
267                 case SLMO_NOTEQUAL:
268                         return strcmp( bufferA, bufferB ) != 0;
269                 case SLMO_GREATEREQUAL:
270                         return strcmp( bufferA, bufferB ) >= 0;
271                 default:
272                         Con_DPrint( "_ServerList_CompareStr: Bad op!\n" );
273                         return false;
274         }
275 }
276
277 static qboolean _ServerList_Entry_Mask( serverlist_mask_t *mask, serverlist_info_t *info )
278 {
279         if( !_ServerList_CompareInt( info->ping, mask->tests[SLIF_PING], mask->info.ping ) )
280                 return false;
281         if( !_ServerList_CompareInt( info->maxplayers, mask->tests[SLIF_MAXPLAYERS], mask->info.maxplayers ) )
282                 return false;
283         if( !_ServerList_CompareInt( info->numplayers, mask->tests[SLIF_NUMPLAYERS], mask->info.numplayers ) )
284                 return false;
285         if( !_ServerList_CompareInt( info->protocol, mask->tests[SLIF_PROTOCOL], mask->info.protocol ))
286                 return false;
287         if( *mask->info.cname
288                 && !_ServerList_CompareStr( info->cname, mask->tests[SLIF_CNAME], mask->info.cname ) )
289                 return false;
290         if( *mask->info.game
291                 && !_ServerList_CompareStr( info->game, mask->tests[SLIF_GAME], mask->info.game ) )
292                 return false;
293         if( *mask->info.mod
294                 && !_ServerList_CompareStr( info->mod, mask->tests[SLIF_MOD], mask->info.mod ) )
295                 return false;
296         if( *mask->info.map
297                 && !_ServerList_CompareStr( info->map, mask->tests[SLIF_MAP], mask->info.map ) )
298                 return false;
299         if( *mask->info.name
300                 && !_ServerList_CompareStr( info->name, mask->tests[SLIF_NAME], mask->info.name ) )
301                 return false;
302         return true;
303 }
304
305 static void ServerList_ViewList_Insert( serverlist_entry_t *entry )
306 {
307         int start, end, mid;
308
309         // reject incompatible servers
310         if (entry->info.gameversion != gameversion.integer)
311                 return;
312
313         // FIXME: change this to be more readable (...)
314         // now check whether it passes through the masks
315         for( start = 0 ; serverlist_andmasks[start].active && start < SERVERLIST_ANDMASKCOUNT ; start++ )
316                 if( !_ServerList_Entry_Mask( &serverlist_andmasks[start], &entry->info ) )
317                         return;
318
319         for( start = 0 ; serverlist_ormasks[start].active && start < SERVERLIST_ORMASKCOUNT ; start++ )
320                 if( _ServerList_Entry_Mask( &serverlist_ormasks[start], &entry->info ) )
321                         break;
322         if( start == SERVERLIST_ORMASKCOUNT || (start > 0 && !serverlist_ormasks[start].active) )
323                 return;
324
325         if( !serverlist_viewcount ) {
326                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
327                 return;
328         }
329         // ok, insert it, we just need to find out where exactly:
330
331         // two special cases
332         // check whether to insert it as new first item
333         if( _ServerList_Entry_Compare( entry, serverlist_viewlist[0] ) ) {
334                 _ServerList_ViewList_Helper_InsertBefore( 0, entry );
335                 return;
336         } // check whether to insert it as new last item
337         else if( !_ServerList_Entry_Compare( entry, serverlist_viewlist[serverlist_viewcount - 1] ) ) {
338                 _ServerList_ViewList_Helper_InsertBefore( serverlist_viewcount, entry );
339                 return;
340         }
341         start = 0;
342         end = serverlist_viewcount - 1;
343         while( end > start + 1 )
344         {
345                 mid = (start + end) / 2;
346                 // test the item that lies in the middle between start and end
347                 if( _ServerList_Entry_Compare( entry, serverlist_viewlist[mid] ) )
348                         // the item has to be in the upper half
349                         end = mid;
350                 else
351                         // the item has to be in the lower half
352                         start = mid;
353         }
354         _ServerList_ViewList_Helper_InsertBefore( start + 1, entry );
355 }
356
357 static void ServerList_ViewList_Remove( serverlist_entry_t *entry )
358 {
359         int i;
360         for( i = 0; i < serverlist_viewcount; i++ )
361         {
362                 if (serverlist_viewlist[i] == entry)
363                 {
364                         _ServerList_ViewList_Helper_Remove(i);
365                         break;
366                 }
367         }
368 }
369
370 void ServerList_RebuildViewList(void)
371 {
372         int i;
373
374         serverlist_viewcount = 0;
375         for( i = 0 ; i < serverlist_cachecount ; i++ )
376                 if( serverlist_cache[i].query == SQS_QUERIED )
377                         ServerList_ViewList_Insert( &serverlist_cache[i] );
378 }
379
380 void ServerList_ResetMasks(void)
381 {
382         memset( &serverlist_andmasks, 0, sizeof( serverlist_andmasks ) );
383         memset( &serverlist_ormasks, 0, sizeof( serverlist_ormasks ) );
384 }
385
386 #if 0
387 static void _ServerList_Test(void)
388 {
389         int i;
390         for( i = 0 ; i < 1024 ; i++ ) {
391                 memset( &serverlist_cache[serverlist_cachecount], 0, sizeof( serverlist_entry_t ) );
392                 serverlist_cache[serverlist_cachecount].info.ping = 1000 + 1024 - i;
393                 dpsnprintf( serverlist_cache[serverlist_cachecount].info.name, sizeof(serverlist_cache[serverlist_cachecount].info.name), "Black's ServerList Test %i", i );
394                 serverlist_cache[serverlist_cachecount].finished = true;
395                 sprintf( serverlist_cache[serverlist_cachecount].line1, "%i %s", serverlist_cache[serverlist_cachecount].info.ping, serverlist_cache[serverlist_cachecount].info.name );
396                 ServerList_ViewList_Insert( &serverlist_cache[serverlist_cachecount] );
397                 serverlist_cachecount++;
398         }
399 }
400 #endif
401
402 void ServerList_QueryList(qboolean querydp, qboolean queryqw)
403 {
404         //masterquerytime = realtime;
405         masterquerytime = Sys_DoubleTime();
406         masterquerycount = 0;
407         masterreplycount = 0;
408         serverquerycount = 0;
409         serverreplycount = 0;
410         serverlist_cachecount = 0;
411         serverlist_viewcount = 0;
412         serverlist_consoleoutput = false;
413
414         //_ServerList_Test();
415
416         NetConn_QueryMasters(querydp, queryqw);
417 }
418
419 // rest
420
421 int NetConn_Read(lhnetsocket_t *mysocket, void *data, int maxlength, lhnetaddress_t *peeraddress)
422 {
423         int length = LHNET_Read(mysocket, data, maxlength, peeraddress);
424         int i;
425         if (length == 0)
426                 return 0;
427         if (cl_netpacketloss.integer)
428                 for (i = 0;i < cl_numsockets;i++)
429                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
430                                 return 0;
431         if (developer_networking.integer)
432         {
433                 char addressstring[128], addressstring2[128];
434                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
435                 if (length > 0)
436                 {
437                         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
438                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i from %s:\n", mysocket, addressstring, data, maxlength, peeraddress, length, addressstring2);
439                         Com_HexDumpToConsole((unsigned char *)data, length);
440                 }
441                 else
442                         Con_Printf("LHNET_Read(%p (%s), %p, %i, %p) = %i\n", mysocket, addressstring, data, maxlength, peeraddress, length);
443         }
444         return length;
445 }
446
447 int NetConn_Write(lhnetsocket_t *mysocket, const void *data, int length, const lhnetaddress_t *peeraddress)
448 {
449         int ret;
450         int i;
451         if (cl_netpacketloss.integer)
452                 for (i = 0;i < cl_numsockets;i++)
453                         if (cl_sockets[i] == mysocket && (rand() % 100) < cl_netpacketloss.integer)
454                                 return length;
455         ret = LHNET_Write(mysocket, data, length, peeraddress);
456         if (developer_networking.integer)
457         {
458                 char addressstring[128], addressstring2[128];
459                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), addressstring, sizeof(addressstring), true);
460                 LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
461                 Con_Printf("LHNET_Write(%p (%s), %p, %i, %p (%s)) = %i%s\n", mysocket, addressstring, data, length, peeraddress, addressstring2, length, ret == length ? "" : " (ERROR)");
462                 Com_HexDumpToConsole((unsigned char *)data, length);
463         }
464         return ret;
465 }
466
467 int NetConn_WriteString(lhnetsocket_t *mysocket, const char *string, const lhnetaddress_t *peeraddress)
468 {
469         // note this does not include the trailing NULL because we add that in the parser
470         return NetConn_Write(mysocket, string, (int)strlen(string), peeraddress);
471 }
472
473 int NetConn_SendUnreliableMessage(netconn_t *conn, sizebuf_t *data, protocolversion_t protocol)
474 {
475         if (protocol == PROTOCOL_QUAKEWORLD)
476         {
477                 int packetLen;
478                 qboolean sendreliable;
479
480                 // note that it is ok to send empty messages to the qw server,
481                 // otherwise it won't respond to us at all
482
483                 sendreliable = false;
484                 // if the remote side dropped the last reliable message, resend it
485                 if (conn->qw.incoming_acknowledged > conn->qw.last_reliable_sequence && conn->qw.incoming_reliable_acknowledged != conn->qw.reliable_sequence)
486                         sendreliable = true;
487                 // if the reliable transmit buffer is empty, copy the current message out
488                 if (!conn->sendMessageLength && conn->message.cursize)
489                 {
490                         memcpy (conn->sendMessage, conn->message.data, conn->message.cursize);
491                         conn->sendMessageLength = conn->message.cursize;
492                         SZ_Clear(&conn->message); // clear the message buffer
493                         conn->qw.reliable_sequence ^= 1;
494                         sendreliable = true;
495                 }
496                 // outgoing unreliable packet number, and outgoing reliable packet number (0 or 1)
497                 *((int *)(sendbuffer + 0)) = LittleLong((unsigned int)conn->qw.outgoing_sequence | ((unsigned int)sendreliable<<31));
498                 // last received unreliable packet number, and last received reliable packet number (0 or 1)
499                 *((int *)(sendbuffer + 4)) = LittleLong((unsigned int)conn->qw.incoming_sequence | ((unsigned int)conn->qw.incoming_reliable_sequence<<31));
500                 packetLen = 8;
501                 conn->qw.outgoing_sequence++;
502                 // client sends qport in every packet
503                 if (conn == cls.netcon)
504                 {
505                         *((short *)(sendbuffer + 8)) = LittleShort(cls.qw_qport);
506                         packetLen += 2;
507                         // also update cls.qw_outgoing_sequence
508                         cls.qw_outgoing_sequence = conn->qw.outgoing_sequence;
509                 }
510                 if (packetLen + (sendreliable ? conn->sendMessageLength : 0) > 1400)
511                 {
512                         Con_Printf ("NetConn_SendUnreliableMessage: reliable message too big %u\n", data->cursize);
513                         return -1;
514                 }
515                 // add the reliable message if there is one
516                 if (sendreliable)
517                 {
518                         memcpy(sendbuffer + packetLen, conn->sendMessage, conn->sendMessageLength);
519                         packetLen += conn->sendMessageLength;
520                         conn->qw.last_reliable_sequence = conn->qw.outgoing_sequence;
521                 }
522                 // add the unreliable message if possible
523                 if (packetLen + data->cursize <= 1400)
524                 {
525                         memcpy(sendbuffer + packetLen, data->data, data->cursize);
526                         packetLen += data->cursize;
527                 }
528
529                 NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
530
531                 packetsSent++;
532                 unreliableMessagesSent++;
533
534                 // delay later packets to obey rate limit
535                 conn->qw.cleartime = max(conn->qw.cleartime, realtime) + packetLen * conn->qw.rate;
536
537                 return 0;
538         }
539         else
540         {
541                 unsigned int packetLen;
542                 unsigned int dataLen;
543                 unsigned int eom;
544                 unsigned int *header;
545
546                 // if a reliable message fragment has been lost, send it again
547                 if (conn->sendMessageLength && (realtime - conn->lastSendTime) > 1.0)
548                 {
549                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
550                         {
551                                 dataLen = conn->sendMessageLength;
552                                 eom = NETFLAG_EOM;
553                         }
554                         else
555                         {
556                                 dataLen = MAX_PACKETFRAGMENT;
557                                 eom = 0;
558                         }
559
560                         packetLen = NET_HEADERSIZE + dataLen;
561
562                         header = (unsigned int *)sendbuffer;
563                         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
564                         header[1] = BigLong(conn->nq.sendSequence - 1);
565                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
566
567                         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) == (int)packetLen)
568                         {
569                                 conn->lastSendTime = realtime;
570                                 packetsReSent++;
571                         }
572                 }
573
574                 // if we have a new reliable message to send, do so
575                 if (!conn->sendMessageLength && conn->message.cursize)
576                 {
577                         if (conn->message.cursize > (int)sizeof(conn->sendMessage))
578                         {
579                                 Con_Printf("NetConn_SendUnreliableMessage: reliable message too big (%u > %u)\n", conn->message.cursize, sizeof(conn->sendMessage));
580                                 conn->message.overflowed = true;
581                                 return -1;
582                         }
583
584                         if (developer_networking.integer && conn == cls.netcon)
585                         {
586                                 Con_Print("client sending reliable message to server:\n");
587                                 SZ_HexDumpToConsole(&conn->message);
588                         }
589
590                         memcpy(conn->sendMessage, conn->message.data, conn->message.cursize);
591                         conn->sendMessageLength = conn->message.cursize;
592                         SZ_Clear(&conn->message);
593
594                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
595                         {
596                                 dataLen = conn->sendMessageLength;
597                                 eom = NETFLAG_EOM;
598                         }
599                         else
600                         {
601                                 dataLen = MAX_PACKETFRAGMENT;
602                                 eom = 0;
603                         }
604
605                         packetLen = NET_HEADERSIZE + dataLen;
606
607                         header = (unsigned int *)sendbuffer;
608                         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
609                         header[1] = BigLong(conn->nq.sendSequence);
610                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
611
612                         conn->nq.sendSequence++;
613
614                         NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
615
616                         conn->lastSendTime = realtime;
617                         packetsSent++;
618                         reliableMessagesSent++;
619                 }
620
621                 // if we have an unreliable message to send, do so
622                 if (data->cursize)
623                 {
624                         packetLen = NET_HEADERSIZE + data->cursize;
625
626                         if (packetLen > (int)sizeof(sendbuffer))
627                         {
628                                 Con_Printf("NetConn_SendUnreliableMessage: message too big %u\n", data->cursize);
629                                 return -1;
630                         }
631
632                         header = (unsigned int *)sendbuffer;
633                         header[0] = BigLong(packetLen | NETFLAG_UNRELIABLE);
634                         header[1] = BigLong(conn->nq.unreliableSendSequence);
635                         memcpy(sendbuffer + NET_HEADERSIZE, data->data, data->cursize);
636
637                         conn->nq.unreliableSendSequence++;
638
639                         NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress);
640
641                         packetsSent++;
642                         unreliableMessagesSent++;
643                 }
644                 return 0;
645         }
646 }
647
648 void NetConn_CloseClientPorts(void)
649 {
650         for (;cl_numsockets > 0;cl_numsockets--)
651                 if (cl_sockets[cl_numsockets - 1])
652                         LHNET_CloseSocket(cl_sockets[cl_numsockets - 1]);
653 }
654
655 void NetConn_OpenClientPort(const char *addressstring, int defaultport)
656 {
657         lhnetaddress_t address;
658         lhnetsocket_t *s;
659         char addressstring2[1024];
660         if (LHNETADDRESS_FromString(&address, addressstring, defaultport))
661         {
662                 if ((s = LHNET_OpenSocket_Connectionless(&address)))
663                 {
664                         cl_sockets[cl_numsockets++] = s;
665                         LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
666                         Con_Printf("Client opened a socket on address %s\n", addressstring2);
667                 }
668                 else
669                 {
670                         LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
671                         Con_Printf("Client failed to open a socket on address %s\n", addressstring2);
672                 }
673         }
674         else
675                 Con_Printf("Client unable to parse address %s\n", addressstring);
676 }
677
678 void NetConn_OpenClientPorts(void)
679 {
680         int port;
681         NetConn_CloseClientPorts();
682         port = bound(0, cl_netport.integer, 65535);
683         if (cl_netport.integer != port)
684                 Cvar_SetValueQuick(&cl_netport, port);
685         Con_Printf("Client using port %i\n", port);
686         NetConn_OpenClientPort("local:2", 0);
687         NetConn_OpenClientPort(net_address.string, port);
688         //NetConn_OpenClientPort(net_address_ipv6.string, port);
689 }
690
691 void NetConn_CloseServerPorts(void)
692 {
693         for (;sv_numsockets > 0;sv_numsockets--)
694                 if (sv_sockets[sv_numsockets - 1])
695                         LHNET_CloseSocket(sv_sockets[sv_numsockets - 1]);
696 }
697
698 void NetConn_OpenServerPort(const char *addressstring, int defaultport)
699 {
700         lhnetaddress_t address;
701         lhnetsocket_t *s;
702         int port;
703         char addressstring2[1024];
704
705         for (port = defaultport; port <= defaultport + 100; port++)
706         {
707                 if (LHNETADDRESS_FromString(&address, addressstring, port))
708                 {
709                         if ((s = LHNET_OpenSocket_Connectionless(&address)))
710                         {
711                                 sv_sockets[sv_numsockets++] = s;
712                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(s), addressstring2, sizeof(addressstring2), true);
713                                 Con_Printf("Server listening on address %s\n", addressstring2);
714                                 break;
715                         }
716                         else
717                         {
718                                 LHNETADDRESS_ToString(&address, addressstring2, sizeof(addressstring2), true);
719                                 Con_Printf("Server failed to open socket on address %s\n", addressstring2);
720                         }
721                 }
722                 else
723                 {
724                         Con_Printf("Server unable to parse address %s\n", addressstring);
725                         // if it cant parse one address, it wont be able to parse another for sure
726                         break;
727                 }
728         }
729 }
730
731 void NetConn_OpenServerPorts(int opennetports)
732 {
733         int port;
734         NetConn_CloseServerPorts();
735         NetConn_UpdateSockets();
736         port = bound(0, sv_netport.integer, 65535);
737         if (port == 0)
738                 port = 26000;
739         Con_Printf("Server using port %i\n", port);
740         if (sv_netport.integer != port)
741                 Cvar_SetValueQuick(&sv_netport, port);
742         if (cls.state != ca_dedicated)
743                 NetConn_OpenServerPort("local:1", 0);
744         if (opennetports)
745         {
746                 NetConn_OpenServerPort(net_address.string, port);
747                 //NetConn_OpenServerPort(net_address_ipv6.string, port);
748         }
749         if (sv_numsockets == 0)
750                 Host_Error("NetConn_OpenServerPorts: unable to open any ports!");
751 }
752
753 lhnetsocket_t *NetConn_ChooseClientSocketForAddress(lhnetaddress_t *address)
754 {
755         int i, a = LHNETADDRESS_GetAddressType(address);
756         for (i = 0;i < cl_numsockets;i++)
757                 if (cl_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])) == a)
758                         return cl_sockets[i];
759         return NULL;
760 }
761
762 lhnetsocket_t *NetConn_ChooseServerSocketForAddress(lhnetaddress_t *address)
763 {
764         int i, a = LHNETADDRESS_GetAddressType(address);
765         for (i = 0;i < sv_numsockets;i++)
766                 if (sv_sockets[i] && LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(sv_sockets[i])) == a)
767                         return sv_sockets[i];
768         return NULL;
769 }
770
771 netconn_t *NetConn_Open(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress)
772 {
773         netconn_t *conn;
774         conn = (netconn_t *)Mem_Alloc(netconn_mempool, sizeof(*conn));
775         conn->mysocket = mysocket;
776         conn->peeraddress = *peeraddress;
777         conn->lastMessageTime = realtime;
778         conn->message.data = conn->messagedata;
779         conn->message.maxsize = sizeof(conn->messagedata);
780         conn->message.cursize = 0;
781         // LordHavoc: (inspired by ProQuake) use a short connect timeout to
782         // reduce effectiveness of connection request floods
783         conn->timeout = realtime + net_connecttimeout.value;
784         LHNETADDRESS_ToString(&conn->peeraddress, conn->address, sizeof(conn->address), true);
785         conn->next = netconn_list;
786         netconn_list = conn;
787         return conn;
788 }
789
790 void NetConn_Close(netconn_t *conn)
791 {
792         netconn_t *c;
793         // remove connection from list
794         if (conn == netconn_list)
795                 netconn_list = conn->next;
796         else
797         {
798                 for (c = netconn_list;c;c = c->next)
799                 {
800                         if (c->next == conn)
801                         {
802                                 c->next = conn->next;
803                                 break;
804                         }
805                 }
806                 // not found in list, we'll avoid crashing here...
807                 if (!c)
808                         return;
809         }
810         // free connection
811         Mem_Free(conn);
812 }
813
814 static int clientport = -1;
815 static int clientport2 = -1;
816 static int hostport = -1;
817 void NetConn_UpdateSockets(void)
818 {
819         if (cls.state != ca_dedicated)
820         {
821                 if (clientport2 != cl_netport.integer)
822                 {
823                         clientport2 = cl_netport.integer;
824                         if (cls.state == ca_connected)
825                                 Con_Print("Changing \"cl_port\" will not take effect until you reconnect.\n");
826                 }
827                 if (cls.state == ca_disconnected && clientport != clientport2)
828                 {
829                         clientport = clientport2;
830                         NetConn_CloseClientPorts();
831                 }
832                 if (cl_numsockets == 0)
833                         NetConn_OpenClientPorts();
834         }
835
836         if (hostport != sv_netport.integer)
837         {
838                 hostport = sv_netport.integer;
839                 if (sv.active)
840                         Con_Print("Changing \"port\" will not take effect until \"map\" command is executed.\n");
841         }
842 }
843
844 static int NetConn_ReceivedMessage(netconn_t *conn, unsigned char *data, int length, protocolversion_t protocol)
845 {
846         if (length < 8)
847                 return 0;
848
849         if (protocol == PROTOCOL_QUAKEWORLD)
850         {
851                 int sequence, sequence_ack;
852                 int reliable_ack, reliable_message;
853                 int count;
854                 int qport;
855
856                 sequence = LittleLong(*((int *)(data + 0)));
857                 sequence_ack = LittleLong(*((int *)(data + 4)));
858                 data += 8;
859                 length -= 8;
860
861                 if (conn != cls.netcon)
862                 {
863                         // server only
864                         if (length < 2)
865                                 return 0;
866                         // TODO: use qport to identify that this client really is who they say they are?  (and elsewhere in the code to identify the connection without a port match?)
867                         qport = LittleShort(*((int *)(data + 8)));
868                         data += 2;
869                         length -= 2;
870                 }
871
872                 packetsReceived++;
873                 reliable_message = (sequence >> 31) & 1;
874                 reliable_ack = (sequence_ack >> 31) & 1;
875                 sequence &= ~(1<<31);
876                 sequence_ack &= ~(1<<31);
877                 if (sequence <= conn->qw.incoming_sequence)
878                 {
879                         Con_DPrint("Got a stale datagram\n");
880                         return 0;
881                 }
882                 count = sequence - (conn->qw.incoming_sequence + 1);
883                 if (count > 0)
884                 {
885                         droppedDatagrams += count;
886                         Con_DPrintf("Dropped %u datagram(s)\n", count);
887                 }
888                 if (reliable_ack == conn->qw.reliable_sequence)
889                 {
890                         // received, now we will be able to send another reliable message
891                         conn->sendMessageLength = 0;
892                         reliableMessagesReceived++;
893                 }
894                 conn->qw.incoming_sequence = sequence;
895                 if (conn == cls.netcon)
896                         cls.qw_incoming_sequence = conn->qw.incoming_sequence;
897                 conn->qw.incoming_acknowledged = sequence_ack;
898                 conn->qw.incoming_reliable_acknowledged = reliable_ack;
899                 if (reliable_message)
900                         conn->qw.incoming_reliable_sequence ^= 1;
901                 conn->lastMessageTime = realtime;
902                 conn->timeout = realtime + net_messagetimeout.value;
903                 unreliableMessagesReceived++;
904                 SZ_Clear(&net_message);
905                 SZ_Write(&net_message, data, length);
906                 MSG_BeginReading();
907                 return 2;
908         }
909         else
910         {
911                 unsigned int count;
912                 unsigned int flags;
913                 unsigned int sequence;
914                 int qlength;
915
916                 qlength = (unsigned int)BigLong(((int *)data)[0]);
917                 flags = qlength & ~NETFLAG_LENGTH_MASK;
918                 qlength &= NETFLAG_LENGTH_MASK;
919                 // control packets were already handled
920                 if (!(flags & NETFLAG_CTL) && qlength == length)
921                 {
922                         sequence = BigLong(((int *)data)[1]);
923                         packetsReceived++;
924                         data += 8;
925                         length -= 8;
926                         if (flags & NETFLAG_UNRELIABLE)
927                         {
928                                 if (sequence >= conn->nq.unreliableReceiveSequence)
929                                 {
930                                         if (sequence > conn->nq.unreliableReceiveSequence)
931                                         {
932                                                 count = sequence - conn->nq.unreliableReceiveSequence;
933                                                 droppedDatagrams += count;
934                                                 Con_DPrintf("Dropped %u datagram(s)\n", count);
935                                         }
936                                         conn->nq.unreliableReceiveSequence = sequence + 1;
937                                         conn->lastMessageTime = realtime;
938                                         conn->timeout = realtime + net_messagetimeout.value;
939                                         unreliableMessagesReceived++;
940                                         if (length > 0)
941                                         {
942                                                 SZ_Clear(&net_message);
943                                                 SZ_Write(&net_message, data, length);
944                                                 MSG_BeginReading();
945                                                 return 2;
946                                         }
947                                 }
948                                 else
949                                         Con_DPrint("Got a stale datagram\n");
950                                 return 1;
951                         }
952                         else if (flags & NETFLAG_ACK)
953                         {
954                                 if (sequence == (conn->nq.sendSequence - 1))
955                                 {
956                                         if (sequence == conn->nq.ackSequence)
957                                         {
958                                                 conn->nq.ackSequence++;
959                                                 if (conn->nq.ackSequence != conn->nq.sendSequence)
960                                                         Con_DPrint("ack sequencing error\n");
961                                                 conn->lastMessageTime = realtime;
962                                                 conn->timeout = realtime + net_messagetimeout.value;
963                                                 if (conn->sendMessageLength > MAX_PACKETFRAGMENT)
964                                                 {
965                                                         unsigned int packetLen;
966                                                         unsigned int dataLen;
967                                                         unsigned int eom;
968                                                         unsigned int *header;
969
970                                                         conn->sendMessageLength -= MAX_PACKETFRAGMENT;
971                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
972
973                                                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
974                                                         {
975                                                                 dataLen = conn->sendMessageLength;
976                                                                 eom = NETFLAG_EOM;
977                                                         }
978                                                         else
979                                                         {
980                                                                 dataLen = MAX_PACKETFRAGMENT;
981                                                                 eom = 0;
982                                                         }
983
984                                                         packetLen = NET_HEADERSIZE + dataLen;
985
986                                                         header = (unsigned int *)sendbuffer;
987                                                         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
988                                                         header[1] = BigLong(conn->nq.sendSequence);
989                                                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
990
991                                                         conn->nq.sendSequence++;
992
993                                                         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) == (int)packetLen)
994                                                         {
995                                                                 conn->lastSendTime = realtime;
996                                                                 packetsSent++;
997                                                         }
998                                                 }
999                                                 else
1000                                                         conn->sendMessageLength = 0;
1001                                         }
1002                                         else
1003                                                 Con_DPrint("Duplicate ACK received\n");
1004                                 }
1005                                 else
1006                                         Con_DPrint("Stale ACK received\n");
1007                                 return 1;
1008                         }
1009                         else if (flags & NETFLAG_DATA)
1010                         {
1011                                 unsigned int temppacket[2];
1012                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
1013                                 temppacket[1] = BigLong(sequence);
1014                                 NetConn_Write(conn->mysocket, (unsigned char *)temppacket, 8, &conn->peeraddress);
1015                                 if (sequence == conn->nq.receiveSequence)
1016                                 {
1017                                         conn->lastMessageTime = realtime;
1018                                         conn->timeout = realtime + net_messagetimeout.value;
1019                                         conn->nq.receiveSequence++;
1020                                         if( conn->receiveMessageLength + length <= (int)sizeof( conn->receiveMessage ) ) {
1021                                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
1022                                                 conn->receiveMessageLength += length;
1023                                         } else {
1024                                                 Con_Printf( "Reliable message (seq: %i) too big for message buffer!\n"
1025                                                                         "Dropping the message!\n", sequence );
1026                                                 conn->receiveMessageLength = 0;
1027                                                 return 1;
1028                                         }
1029                                         if (flags & NETFLAG_EOM)
1030                                         {
1031                                                 reliableMessagesReceived++;
1032                                                 length = conn->receiveMessageLength;
1033                                                 conn->receiveMessageLength = 0;
1034                                                 if (length > 0)
1035                                                 {
1036                                                         SZ_Clear(&net_message);
1037                                                         SZ_Write(&net_message, conn->receiveMessage, length);
1038                                                         MSG_BeginReading();
1039                                                         return 2;
1040                                                 }
1041                                         }
1042                                 }
1043                                 else
1044                                         receivedDuplicateCount++;
1045                                 return 1;
1046                         }
1047                 }
1048         }
1049         return 0;
1050 }
1051
1052 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress, protocolversion_t initialprotocol)
1053 {
1054         cls.connect_trying = false;
1055         M_Update_Return_Reason("");
1056         // the connection request succeeded, stop current connection and set up a new connection
1057         CL_Disconnect();
1058         // if we're connecting to a remote server, shut down any local server
1059         if (LHNETADDRESS_GetAddressType(peeraddress) != LHNETADDRESSTYPE_LOOP && sv.active)
1060                 Host_ShutdownServer ();
1061         // allocate a net connection to keep track of things
1062         cls.netcon = NetConn_Open(mysocket, peeraddress);
1063         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
1064         key_dest = key_game;
1065         m_state = m_none;
1066         cls.demonum = -1;                       // not in the demo loop now
1067         cls.state = ca_connected;
1068         cls.signon = 0;                         // need all the signon messages before playing
1069         cls.protocol = initialprotocol;
1070         if (cls.protocol == PROTOCOL_QUAKEWORLD)
1071                 Cmd_ForwardStringToServer("new");
1072 }
1073
1074 int NetConn_IsLocalGame(void)
1075 {
1076         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
1077                 return true;
1078         return false;
1079 }
1080
1081 static int NetConn_ClientParsePacket_ServerList_ProcessReply(const char *addressstring)
1082 {
1083         int n;
1084         int pingtime;
1085         // search the cache for this server and update it
1086         for (n = 0;n < serverlist_cachecount;n++)
1087                 if (!strcmp(addressstring, serverlist_cache[n].info.cname))
1088                         break;
1089         if (n == serverlist_cachecount)
1090         {
1091                 // LAN search doesnt require an answer from the master server so we wont
1092                 // know the ping nor will it be initialized already...
1093
1094                 // find a slot
1095                 if (serverlist_cachecount == SERVERLIST_TOTALSIZE)
1096                         return -1;
1097
1098                 memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1099                 // store the data the engine cares about (address and ping)
1100                 strlcpy(serverlist_cache[serverlist_cachecount].info.cname, addressstring, sizeof(serverlist_cache[serverlist_cachecount].info.cname));
1101                 serverlist_cache[serverlist_cachecount].info.ping = 100000;
1102                 //serverlist_cache[serverlist_cachecount].querytime = realtime;
1103                 serverlist_cache[serverlist_cachecount].querytime = Sys_DoubleTime();
1104                 // if not in the slist menu we should print the server to console
1105                 if (serverlist_consoleoutput)
1106                         Con_Printf("querying %s\n", addressstring);
1107                 ++serverlist_cachecount;
1108         }
1109         // if this is the first reply from this server, count it as having replied
1110         if (serverlist_cache[n].info.ping == 100000)
1111                 serverreplycount++;
1112         pingtime = (int)((Sys_DoubleTime() - serverlist_cache[n].querytime) * 1000.0 + 0.5);
1113         pingtime = bound(0, pingtime, 9999);
1114         // update the ping
1115         serverlist_cache[n].info.ping = min(serverlist_cache[n].info.ping, pingtime);
1116         // other server info is updated by the caller
1117         return n;
1118 }
1119
1120 static void NetConn_ClientParsePacket_ServerList_UpdateCache(int n)
1121 {
1122         serverlist_info_t *info = &serverlist_cache[n].info;
1123         // update description strings for engine menu and console output
1124         dpsnprintf(serverlist_cache[n].line1, sizeof(serverlist_cache[n].line1), "^%c%5d^7 ^%c%3u^7/%3u %-65.65s", info->ping >= 300 ? '1' : (info->ping >= 200 ? '3' : '7'), (int)info->ping, ((info->numplayers > 0 && info->numplayers < info->maxplayers) ? (info->numplayers >= 4 ? '7' : '3') : '1'), info->numplayers, info->maxplayers, info->name);
1125         dpsnprintf(serverlist_cache[n].line2, sizeof(serverlist_cache[n].line2), "^4%-21.21s %-19.19s ^%c%-17.17s^4 %-20.20s", info->cname, info->game, (info->gameversion != gameversion.integer) ? '1' : '4', info->mod, info->map);
1126         if (serverlist_cache[n].query == SQS_QUERIED)
1127                 ServerList_ViewList_Remove(&serverlist_cache[n]);
1128         // if not in the slist menu we should print the server to console (if wanted)
1129         else if( serverlist_consoleoutput )
1130                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1131         // and finally, update the view set
1132         ServerList_ViewList_Insert( &serverlist_cache[n] );
1133         serverlist_cache[n].query = SQS_QUERIED;
1134 }
1135
1136 static int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1137 {
1138         qboolean fromserver;
1139         int ret, c, control;
1140         const char *s;
1141         char *string, addressstring2[128], ipstring[32];
1142         char stringbuf[16384];
1143
1144         // quakeworld ingame packet
1145         fromserver = cls.netcon && mysocket == cls.netcon->mysocket && !LHNETADDRESS_Compare(&cls.netcon->peeraddress, peeraddress);
1146
1147         // convert the address to a string incase we need it
1148         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1149
1150         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1151         {
1152                 // received a command string - strip off the packaging and put it
1153                 // into our string buffer with NULL termination
1154                 data += 4;
1155                 length -= 4;
1156                 length = min(length, (int)sizeof(stringbuf) - 1);
1157                 memcpy(stringbuf, data, length);
1158                 stringbuf[length] = 0;
1159                 string = stringbuf;
1160
1161                 if (developer_networking.integer)
1162                 {
1163                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
1164                         Com_HexDumpToConsole(data, length);
1165                 }
1166
1167                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
1168                 {
1169                         // darkplaces or quake3
1170                         char protocolnames[1400];
1171                         Protocol_Names(protocolnames, sizeof(protocolnames));
1172                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
1173                         M_Update_Return_Reason("Got challenge response");
1174                         // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1175                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1176                         // TODO: add userinfo stuff here instead of using NQ commands?
1177                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\protocols\\%s\\challenge\\%s", protocolnames, string + 10), peeraddress);
1178                         return true;
1179                 }
1180                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
1181                 {
1182                         // darkplaces or quake3
1183                         M_Update_Return_Reason("Accepted");
1184                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_DARKPLACES3);
1185                         return true;
1186                 }
1187                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
1188                 {
1189                         char rejectreason[32];
1190                         cls.connect_trying = false;
1191                         string += 7;
1192                         length = max(length - 7, (int)sizeof(rejectreason) - 1);
1193                         memcpy(rejectreason, string, length);
1194                         rejectreason[length] = 0;
1195                         M_Update_Return_Reason(rejectreason);
1196                         return true;
1197                 }
1198                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1199                 {
1200                         serverlist_info_t *info;
1201                         int n;
1202
1203                         string += 13;
1204                         // search the cache for this server and update it
1205                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1206                         if (n < 0)
1207                                 return true;
1208
1209                         info = &serverlist_cache[n].info;
1210                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));else info->game[0] = 0;
1211                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1212                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1213                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1214                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);else info->protocol = -1;
1215                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);else info->numplayers = 0;
1216                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1217                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);else info->gameversion = 0;
1218
1219                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1220
1221                         return true;
1222                 }
1223                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1224                 {
1225                         // Extract the IP addresses
1226                         data += 18;
1227                         length -= 18;
1228                         masterreplycount++;
1229                         if (serverlist_consoleoutput)
1230                                 Con_Print("received DarkPlaces server list...\n");
1231                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
1232                         {
1233                                 int n;
1234
1235                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], data[5] * 256 + data[6]);
1236                                 if (serverlist_consoleoutput && developer_networking.integer)
1237                                         Con_Printf("Requesting info from DarkPlaces server %s\n", ipstring);
1238                                 // ignore the rest of the message if the serverlist is full
1239                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1240                                         break;
1241                                 // also ignore it if we have already queried it (other master server response)
1242                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1243                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1244                                                 break;
1245                                 if( n >= serverlist_cachecount )
1246                                 {
1247                                         serverquerycount++;
1248
1249                                         memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1250                                         serverlist_cache[serverlist_cachecount].protocol = PROTOCOL_DARKPLACES7;
1251                                         // store the data the engine cares about (address and ping)
1252                                         strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1253                                         serverlist_cache[serverlist_cachecount].info.ping = 100000;
1254                                         serverlist_cache[serverlist_cachecount].query = SQS_QUERYING;
1255
1256                                         ++serverlist_cachecount;
1257                                 }
1258
1259                                 // move on to next address in packet
1260                                 data += 7;
1261                                 length -= 7;
1262                         }
1263                         // begin or resume serverlist queries
1264                         serverlist_querysleep = false;
1265                         serverlist_querywaittime = realtime + 3;
1266                         return true;
1267                 }
1268                 if (!memcmp(string, "d\n", 2) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1269                 {
1270                         // Extract the IP addresses
1271                         data += 2;
1272                         length -= 2;
1273                         masterreplycount++;
1274                         if (serverlist_consoleoutput)
1275                                 Con_Printf("received QuakeWorld server list from %s...\n", addressstring2);
1276                         while (length >= 6 && (data[0] != 0xFF || data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF) && data[4] * 256 + data[5] != 0)
1277                         {
1278                                 int n;
1279
1280                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[0], data[1], data[2], data[3], data[4] * 256 + data[5]);
1281                                 if (serverlist_consoleoutput && developer_networking.integer)
1282                                         Con_Printf("Requesting info from QuakeWorld server %s\n", ipstring);
1283                                 // ignore the rest of the message if the serverlist is full
1284                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1285                                         break;
1286                                 // also ignore it if we have already queried it (other master server response)
1287                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1288                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1289                                                 break;
1290                                 if( n >= serverlist_cachecount )
1291                                 {
1292                                         serverquerycount++;
1293
1294                                         memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1295                                         serverlist_cache[serverlist_cachecount].protocol = PROTOCOL_QUAKEWORLD;
1296                                         // store the data the engine cares about (address and ping)
1297                                         strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1298                                         serverlist_cache[serverlist_cachecount].info.ping = 100000;
1299                                         serverlist_cache[serverlist_cachecount].query = SQS_QUERYING;
1300
1301                                         ++serverlist_cachecount;
1302                                 }
1303
1304                                 // move on to next address in packet
1305                                 data += 6;
1306                                 length -= 6;
1307                         }
1308                         // begin or resume serverlist queries
1309                         serverlist_querysleep = false;
1310                         serverlist_querywaittime = realtime + 3;
1311                         return true;
1312                 }
1313                 if (!strncmp(string, "ping", 4))
1314                 {
1315                         if (developer.integer >= 10)
1316                                 Con_Printf("Received ping from %s, sending ack\n", addressstring2);
1317                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1318                         return true;
1319                 }
1320                 if (!strncmp(string, "ack", 3))
1321                         return true;
1322                 // QuakeWorld compatibility
1323                 if (length > 1 && string[0] == 'c' && (string[1] == '-' || (string[1] >= '0' && string[1] <= '9')) && cls.connect_trying)
1324                 {
1325                         // challenge message
1326                         Con_Printf("challenge %s received, sending QuakeWorld connect request back to %s\n", string + 1, addressstring2);
1327                         M_Update_Return_Reason("Got QuakeWorld challenge response");
1328                         cls.qw_qport = qport.integer;
1329                         // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1330                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1331                         NetConn_WriteString(mysocket, va("\377\377\377\377connect %i %i %i \"%s\"\n", 28, cls.qw_qport, atoi(string + 1), cls.userinfo), peeraddress);
1332                         return true;
1333                 }
1334                 if (length >= 1 && string[0] == 'j' && cls.connect_trying)
1335                 {
1336                         // accept message
1337                         M_Update_Return_Reason("QuakeWorld Accepted");
1338                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_QUAKEWORLD);
1339                         return true;
1340                 }
1341                 if (length > 2 && !memcmp(string, "n\\", 2))
1342                 {
1343                         serverlist_info_t *info;
1344                         int n;
1345
1346                         // qw server status
1347                         if (serverlist_consoleoutput && developer_networking.integer >= 2)
1348                                 Con_Printf("QW server status from server at %s:\n%s\n", addressstring2, string + 1);
1349
1350                         string += 1;
1351                         // search the cache for this server and update it
1352                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1353                         if (n < 0)
1354                                 return true;
1355
1356                         info = &serverlist_cache[n].info;
1357                         strlcpy(info->game, "QuakeWorld", sizeof(info->game));;
1358                         if ((s = SearchInfostring(string, "*gamedir"     )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1359                         if ((s = SearchInfostring(string, "map"          )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1360                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1361                         info->protocol = 0;
1362                         info->numplayers = 0; // updated below
1363                         if ((s = SearchInfostring(string, "maxclients"   )) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1364                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);else info->gameversion = 0;
1365
1366                         // count active players on server
1367                         // (we could gather more info, but we're just after the number)
1368                         s = strchr(string, '\n');
1369                         if (s)
1370                         {
1371                                 s++;
1372                                 while (s < string + length)
1373                                 {
1374                                         for (;s < string + length && *s != '\n';s++)
1375                                                 ;
1376                                         if (s >= string + length)
1377                                                 break;
1378                                         info->numplayers++;
1379                                         s++;
1380                                 }
1381                         }
1382
1383                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1384
1385                         return true;
1386                 }
1387                 if (string[0] == 'n')
1388                 {
1389                         // qw print command
1390                         Con_Printf("QW print command from server at %s:\n%s\n", addressstring2, string + 1);
1391                 }
1392                 // we may not have liked the packet, but it was a command packet, so
1393                 // we're done processing this packet now
1394                 return true;
1395         }
1396         // quakeworld ingame packet
1397         if (fromserver && cls.protocol == PROTOCOL_QUAKEWORLD && length >= 8 && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol)) == 2)
1398         {
1399                 ret = 0;
1400                 CL_ParseServerMessage();
1401                 return ret;
1402         }
1403         // netquake control packets, supported for compatibility only
1404         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1405         {
1406                 int n;
1407                 serverlist_info_t *info;
1408
1409                 c = data[4];
1410                 data += 5;
1411                 length -= 5;
1412                 switch (c)
1413                 {
1414                 case CCREP_ACCEPT:
1415                         if (developer.integer >= 10)
1416                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
1417                         if (cls.connect_trying)
1418                         {
1419                                 lhnetaddress_t clientportaddress;
1420                                 clientportaddress = *peeraddress;
1421                                 if (length >= 4)
1422                                 {
1423                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
1424                                         data += 4;
1425                                         length -= 4;
1426                                         LHNETADDRESS_SetPort(&clientportaddress, port);
1427                                 }
1428                                 M_Update_Return_Reason("Accepted");
1429                                 // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1430                                 InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1431                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress, PROTOCOL_QUAKE);
1432                         }
1433                         break;
1434                 case CCREP_REJECT:
1435                         if (developer.integer >= 10)
1436                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1437                         cls.connect_trying = false;
1438                         M_Update_Return_Reason((char *)data);
1439                         break;
1440                 // TODO: fix this code so that lan searches for quake servers will work
1441                 case CCREP_SERVER_INFO:
1442                         if (developer.integer >= 10)
1443                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1444                         // LordHavoc: because the quake server may report weird addresses
1445                         // we just ignore it and keep the real address
1446                         MSG_ReadString();
1447                         // search the cache for this server and update it
1448                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1449                         if (n < 0)
1450                                 break;
1451
1452                         info = &serverlist_cache[n].info;
1453                         strlcpy(info->game, "Quake", sizeof(info->game));
1454                         strlcpy(info->mod , "", sizeof(info->mod)); // mod name is not specified
1455                         strlcpy(info->name, MSG_ReadString(), sizeof(info->name));
1456                         strlcpy(info->map , MSG_ReadString(), sizeof(info->map));
1457                         info->numplayers = MSG_ReadByte();
1458                         info->maxplayers = MSG_ReadByte();
1459                         info->protocol = MSG_ReadByte();
1460
1461                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1462
1463                         break;
1464                 case CCREP_PLAYER_INFO:
1465                         // we got a CCREP_PLAYER_INFO??
1466                         //if (developer.integer >= 10)
1467                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1468                         break;
1469                 case CCREP_RULE_INFO:
1470                         // we got a CCREP_RULE_INFO??
1471                         //if (developer.integer >= 10)
1472                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1473                         break;
1474                 default:
1475                         break;
1476                 }
1477                 // we may not have liked the packet, but it was a valid control
1478                 // packet, so we're done processing this packet now
1479                 return true;
1480         }
1481         ret = 0;
1482         if (fromserver && length >= (int)NET_HEADERSIZE && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol)) == 2)
1483                 CL_ParseServerMessage();
1484         return ret;
1485 }
1486
1487 void NetConn_QueryQueueFrame(void)
1488 {
1489         int index;
1490         int queries;
1491         int maxqueries;
1492         double timeouttime;
1493         static double querycounter = 0;
1494
1495         if (serverlist_querysleep)
1496                 return;
1497
1498         // apply a cool down time after master server replies,
1499         // to avoid messing up the ping times on the servers
1500         if (serverlist_querywaittime > realtime)
1501                 return;
1502
1503         // each time querycounter reaches 1.0 issue a query
1504         querycounter += cl.realframetime * net_slist_queriespersecond.value;
1505         maxqueries = (int)querycounter;
1506         maxqueries = bound(0, maxqueries, net_slist_queriesperframe.integer);
1507         querycounter -= maxqueries;
1508
1509         if( maxqueries == 0 ) {
1510                 return;
1511         }
1512
1513         // scan serverlist and issue queries as needed
1514     serverlist_querysleep = true;
1515
1516         timeouttime = realtime - net_slist_timeout.value;
1517         for( index = 0, queries = 0 ; index < serverlist_cachecount && queries < maxqueries ; index++ )
1518         {
1519                 serverlist_entry_t *entry = &serverlist_cache[ index ];
1520                 if( entry->query != SQS_QUERYING )
1521                 {
1522                         continue;
1523                 }
1524
1525         serverlist_querysleep = false;
1526                 if( entry->querycounter != 0 && entry->querytime > timeouttime )
1527                 {
1528                         continue;
1529                 }
1530
1531                 if( entry->querycounter != (unsigned) net_slist_maxtries.integer )
1532                 {
1533                         lhnetaddress_t address;
1534                         int socket;
1535
1536                         LHNETADDRESS_FromString(&address, entry->info.cname, 0);
1537                         if (entry->protocol == PROTOCOL_QUAKEWORLD)
1538                         {
1539                                 for (socket = 0; socket < cl_numsockets ; socket++)
1540                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377status\n", &address);
1541                         }
1542                         else
1543                         {
1544                                 for (socket = 0; socket < cl_numsockets ; socket++)
1545                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377getinfo", &address);
1546                         }
1547
1548                         //entry->querytime = realtime;
1549                         entry->querytime = Sys_DoubleTime();
1550                         entry->querycounter++;
1551
1552                         // if not in the slist menu we should print the server to console
1553                         if (serverlist_consoleoutput)
1554                                 Con_Printf("querying %25s (%i. try)\n", entry->info.cname, entry->querycounter);
1555
1556                         queries++;
1557                 }
1558                 else
1559                 {
1560                         entry->query = SQS_TIMEDOUT;
1561                 }
1562         }
1563 }
1564
1565 void NetConn_ClientFrame(void)
1566 {
1567         int i, length;
1568         lhnetaddress_t peeraddress;
1569         NetConn_UpdateSockets();
1570         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
1571         {
1572                 if (cls.connect_remainingtries == 0)
1573                         M_Update_Return_Reason("Connect: Waiting 10 seconds for reply");
1574                 cls.connect_nextsendtime = realtime + 1;
1575                 cls.connect_remainingtries--;
1576                 if (cls.connect_remainingtries <= -10)
1577                 {
1578                         cls.connect_trying = false;
1579                         M_Update_Return_Reason("Connect: Failed");
1580                         return;
1581                 }
1582                 // try challenge first (newer DP server or QW)
1583                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
1584                 // then try netquake as a fallback (old server, or netquake)
1585                 SZ_Clear(&net_message);
1586                 // save space for the header, filled in later
1587                 MSG_WriteLong(&net_message, 0);
1588                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
1589                 MSG_WriteString(&net_message, "QUAKE");
1590                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1591                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1592                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
1593                 SZ_Clear(&net_message);
1594         }
1595         for (i = 0;i < cl_numsockets;i++)
1596                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1597                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
1598         NetConn_QueryQueueFrame();
1599         if (cls.netcon && realtime > cls.netcon->timeout)
1600         {
1601                 Con_Print("Connection timed out\n");
1602                 CL_Disconnect();
1603                 Host_ShutdownServer ();
1604         }
1605 }
1606
1607 #define MAX_CHALLENGES 128
1608 struct challenge_s
1609 {
1610         lhnetaddress_t address;
1611         double time;
1612         char string[12];
1613 }
1614 challenge[MAX_CHALLENGES];
1615
1616 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
1617 {
1618         int i;
1619         char c;
1620         for (i = 0;i < bufferlength - 1;i++)
1621         {
1622                 do
1623                 {
1624                         c = rand () % (127 - 33) + 33;
1625                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
1626                 buffer[i] = c;
1627         }
1628         buffer[i] = 0;
1629 }
1630
1631 static qboolean NetConn_BuildStatusResponse(const char* challenge, char* out_msg, size_t out_size, qboolean fullstatus)
1632 {
1633         unsigned int nb_clients = 0, i;
1634         int length;
1635
1636         // How many clients are there?
1637         for (i = 0;i < (unsigned int)svs.maxclients;i++)
1638                 if (svs.clients[i].active)
1639                         nb_clients++;
1640
1641         // TODO: we should add more information for the full status string
1642         length = dpsnprintf(out_msg, out_size,
1643                                                 "\377\377\377\377%s\x0A"
1644                                                 "\\gamename\\%s\\modname\\%s\\gameversion\\%d\\sv_maxclients\\%d"
1645                                                 "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d"
1646                                                 "%s%s"
1647                                                 "%s",
1648                                                 fullstatus ? "statusResponse" : "infoResponse",
1649                                                 gamename, com_modname, gameversion.integer, svs.maxclients,
1650                                                 nb_clients, sv.name, hostname.string, NET_PROTOCOL_VERSION,
1651                                                 challenge ? "\\challenge\\" : "", challenge ? challenge : "",
1652                                                 fullstatus ? "\n" : "");
1653
1654         // Make sure it fits in the buffer
1655         if (length < 0)
1656                 return false;
1657
1658         if (fullstatus)
1659         {
1660                 char *ptr;
1661                 int left;
1662
1663                 ptr = out_msg + length;
1664                 left = (int)out_size - length;
1665
1666                 for (i = 0;i < (unsigned int)svs.maxclients;i++)
1667                 {
1668                         client_t *cl = &svs.clients[i];
1669                         if (cl->active)
1670                         {
1671                                 int nameind, cleanind;
1672                                 char curchar;
1673                                 char cleanname [sizeof(cl->name)];
1674
1675                                 // Remove all characters '"' and '\' in the player name
1676                                 nameind = 0;
1677                                 cleanind = 0;
1678                                 do
1679                                 {
1680                                         curchar = cl->name[nameind++];
1681                                         if (curchar != '"' && curchar != '\\')
1682                                         {
1683                                                 cleanname[cleanind++] = curchar;
1684                                                 if (cleanind == sizeof(cleanname) - 1)
1685                                                         break;
1686                                         }
1687                                 } while (curchar != '\0');
1688
1689                                 length = dpsnprintf(ptr, left, "%d %d \"%s\"\n",
1690                                                                         cl->frags,
1691                                                                         (int)(cl->ping * 1000.0f),
1692                                                                         cleanname);
1693                                 if(length < 0)
1694                                         return false;
1695                                 left -= length;
1696                                 ptr += length;
1697                         }
1698                 }
1699         }
1700
1701         return true;
1702 }
1703
1704 extern void SV_SendServerinfo (client_t *client);
1705 static int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1706 {
1707         int i, ret, clientnum, best;
1708         double besttime;
1709         client_t *client;
1710         netconn_t *conn;
1711         char *s, *string, response[1400], addressstring2[128], stringbuf[16384];
1712
1713         if (!sv.active)
1714                 return false;
1715
1716         // convert the address to a string incase we need it
1717         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1718
1719         // see if we can identify the sender as a local player
1720         // (this is necessary for rcon to send a reliable reply if the client is
1721         //  actually on the server, not sending remotely)
1722         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1723                 if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1724                         break;
1725         if (i == svs.maxclients)
1726                 host_client = NULL;
1727
1728         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1729         {
1730                 // received a command string - strip off the packaging and put it
1731                 // into our string buffer with NULL termination
1732                 data += 4;
1733                 length -= 4;
1734                 length = min(length, (int)sizeof(stringbuf) - 1);
1735                 memcpy(stringbuf, data, length);
1736                 stringbuf[length] = 0;
1737                 string = stringbuf;
1738
1739                 if (developer.integer >= 10)
1740                 {
1741                         Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1742                         Com_HexDumpToConsole(data, length);
1743                 }
1744
1745                 if (length >= 12 && !memcmp(string, "getchallenge", 12))
1746                 {
1747                         for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1748                         {
1749                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1750                                         break;
1751                                 if (besttime > challenge[i].time)
1752                                         besttime = challenge[best = i].time;
1753                         }
1754                         // if we did not find an exact match, choose the oldest and
1755                         // update address and string
1756                         if (i == MAX_CHALLENGES)
1757                         {
1758                                 i = best;
1759                                 challenge[i].address = *peeraddress;
1760                                 NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1761                         }
1762                         challenge[i].time = realtime;
1763                         // send the challenge
1764                         NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1765                         return true;
1766                 }
1767                 if (length > 8 && !memcmp(string, "connect\\", 8))
1768                 {
1769                         string += 7;
1770                         length -= 7;
1771                         if ((s = SearchInfostring(string, "challenge")))
1772                         {
1773                                 // validate the challenge
1774                                 for (i = 0;i < MAX_CHALLENGES;i++)
1775                                         if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1776                                                 break;
1777                                 if (i < MAX_CHALLENGES)
1778                                 {
1779                                         // check engine protocol
1780                                         if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1781                                         {
1782                                                 if (developer.integer >= 10)
1783                                                         Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1784                                                 NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1785                                         }
1786                                         else
1787                                         {
1788                                                 // see if this is a duplicate connection request
1789                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1790                                                         if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1791                                                                 break;
1792                                                 if (clientnum < svs.maxclients && realtime - client->connecttime < net_messagerejointimeout.value)
1793                                                 {
1794                                                         // client is still trying to connect,
1795                                                         // so we send a duplicate reply
1796                                                         if (developer.integer >= 10)
1797                                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1798                                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1799                                                 }
1800 #if 0
1801                                                 else if (clientnum < svs.maxclients)
1802                                                 {
1803                                                         if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1804                                                         {
1805                                                                 // client crashed and is coming back, keep their stuff intact
1806                                                                 SV_SendServerinfo(client);
1807                                                                 //host_client = client;
1808                                                                 //SV_DropClient (true);
1809                                                         }
1810                                                         // else ignore them
1811                                                 }
1812 #endif
1813                                                 else
1814                                                 {
1815                                                         // this is a new client, find a slot
1816                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1817                                                                 if (!client->active)
1818                                                                         break;
1819                                                         if (clientnum < svs.maxclients)
1820                                                         {
1821                                                                 // prepare the client struct
1822                                                                 if ((conn = NetConn_Open(mysocket, peeraddress)))
1823                                                                 {
1824                                                                         // allocated connection
1825                                                                         if (developer.integer >= 10)
1826                                                                                 Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1827                                                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1828                                                                         // now set up the client
1829                                                                         SV_VM_Begin();
1830                                                                         SV_ConnectClient(clientnum, conn);
1831                                                                         SV_VM_End();
1832                                                                         NetConn_Heartbeat(1);
1833                                                                 }
1834                                                         }
1835                                                         else
1836                                                         {
1837                                                                 // server is full
1838                                                                 if (developer.integer >= 10)
1839                                                                         Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1840                                                                 NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1841                                                         }
1842                                                 }
1843                                         }
1844                                 }
1845                         }
1846                         return true;
1847                 }
1848                 if (length >= 7 && !memcmp(string, "getinfo", 7))
1849                 {
1850                         const char *challenge = NULL;
1851
1852                         // If there was a challenge in the getinfo message
1853                         if (length > 8 && string[7] == ' ')
1854                                 challenge = string + 8;
1855
1856                         if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), false))
1857                         {
1858                                 if (developer.integer >= 10)
1859                                         Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1860                                 NetConn_WriteString(mysocket, response, peeraddress);
1861                         }
1862                         return true;
1863                 }
1864                 if (length >= 9 && !memcmp(string, "getstatus", 9))
1865                 {
1866                         const char *challenge = NULL;
1867
1868                         // If there was a challenge in the getinfo message
1869                         if (length > 10 && string[9] == ' ')
1870                                 challenge = string + 10;
1871
1872                         if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), true))
1873                         {
1874                                 if (developer.integer >= 10)
1875                                         Con_Printf("Sending reply to client %s - %s\n", addressstring2, response);
1876                                 NetConn_WriteString(mysocket, response, peeraddress);
1877                         }
1878                         return true;
1879                 }
1880                 if (length >= 5 && !memcmp(string, "rcon ", 5))
1881                 {
1882                         int i;
1883                         char *s = string + 5;
1884                         char password[64];
1885                         for (i = 0;*s > ' ';s++)
1886                                 if (i < (int)sizeof(password) - 1)
1887                                         password[i++] = *s;
1888                         password[i] = 0;
1889                         if (password[0] > ' ' && !strcmp(rcon_password.string, password))
1890                         {
1891                                 // looks like a legitimate rcon command with the correct password
1892                                 Con_Printf("server received rcon command from %s:\n%s\n", host_client ? host_client->name : addressstring2, s);
1893                                 rcon_redirect = true;
1894                                 rcon_redirect_bufferpos = 0;
1895                                 Cmd_ExecuteString(s, src_command);
1896                                 rcon_redirect_buffer[rcon_redirect_bufferpos] = 0;
1897                                 rcon_redirect = false;
1898                                 // print resulting text to client
1899                                 // if client is playing, send a reliable reply instead of
1900                                 // a command packet
1901                                 if (host_client)
1902                                 {
1903                                         // if the netconnection is loop, then this is the
1904                                         // local player on a listen mode server, and it would
1905                                         // result in duplicate printing to the console
1906                                         // (not that the local player should be using rcon
1907                                         //  when they have the console)
1908                                         if (host_client->netconnection && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
1909                                                 SV_ClientPrintf("%s", rcon_redirect_buffer);
1910                                 }
1911                                 else
1912                                 {
1913                                         // qw print command
1914                                         dpsnprintf(response, sizeof(response), "\377\377\377\377n%s", rcon_redirect_buffer);
1915                                         NetConn_WriteString(mysocket, response, peeraddress);
1916                                 }
1917                         }
1918                         return true;
1919                 }
1920                 if (!strncmp(string, "ping", 4))
1921                 {
1922                         if (developer.integer >= 10)
1923                                 Con_Printf("Received ping from %s, sending ack\n", addressstring2);
1924                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1925                         return true;
1926                 }
1927                 if (!strncmp(string, "ack", 3))
1928                         return true;
1929                 // we may not have liked the packet, but it was a command packet, so
1930                 // we're done processing this packet now
1931                 return true;
1932         }
1933         // LordHavoc: disabled netquake control packet support in server
1934 #if 0
1935         {
1936                 int c, control;
1937                 // netquake control packets, supported for compatibility only
1938                 if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1939                 {
1940                         c = data[4];
1941                         data += 5;
1942                         length -= 5;
1943                         switch (c)
1944                         {
1945                         case CCREQ_CONNECT:
1946                                 if (developer.integer >= 10)
1947                                         Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
1948                                 if (length >= (int)strlen("QUAKE") + 1 + 1)
1949                                 {
1950                                         if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
1951                                         {
1952                                                 if (developer.integer >= 10)
1953                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
1954                                                 SZ_Clear(&net_message);
1955                                                 // save space for the header, filled in later
1956                                                 MSG_WriteLong(&net_message, 0);
1957                                                 MSG_WriteByte(&net_message, CCREP_REJECT);
1958                                                 MSG_WriteString(&net_message, "Incompatible version.\n");
1959                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1960                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1961                                                 SZ_Clear(&net_message);
1962                                         }
1963                                         else
1964                                         {
1965                                                 // see if this is a duplicate connection request
1966                                                 for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1967                                                         if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1968                                                                 break;
1969                                                 if (clientnum < svs.maxclients)
1970                                                 {
1971                                                         // duplicate connection request
1972                                                         if (realtime - client->connecttime < 2.0)
1973                                                         {
1974                                                                 // client is still trying to connect,
1975                                                                 // so we send a duplicate reply
1976                                                                 if (developer.integer >= 10)
1977                                                                         Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
1978                                                                 SZ_Clear(&net_message);
1979                                                                 // save space for the header, filled in later
1980                                                                 MSG_WriteLong(&net_message, 0);
1981                                                                 MSG_WriteByte(&net_message, CCREP_ACCEPT);
1982                                                                 MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
1983                                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1984                                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
1985                                                                 SZ_Clear(&net_message);
1986                                                         }
1987 #if 0
1988                                                         else if (realtime - client->netconnection->lastMessageTime >= net_messagerejointimeout.value)
1989                                                         {
1990                                                                 SV_SendServerinfo(client);
1991                                                                 // the old client hasn't sent us anything
1992                                                                 // in quite a while, so kick off and let
1993                                                                 // the retry take care of it...
1994                                                                 //host_client = client;
1995                                                                 //SV_DropClient (true);
1996                                                         }
1997 #endif
1998                                                 }
1999                                                 else
2000                                                 {
2001                                                         // this is a new client, find a slot
2002                                                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2003                                                                 if (!client->active)
2004                                                                         break;
2005                                                         if (clientnum < svs.maxclients && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
2006                                                         {
2007                                                                 // connect to the client
2008                                                                 // everything is allocated, just fill in the details
2009                                                                 strlcpy (conn->address, addressstring2, sizeof (conn->address));
2010                                                                 if (developer.integer >= 10)
2011                                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
2012                                                                 // send back the info about the server connection
2013                                                                 SZ_Clear(&net_message);
2014                                                                 // save space for the header, filled in later
2015                                                                 MSG_WriteLong(&net_message, 0);
2016                                                                 MSG_WriteByte(&net_message, CCREP_ACCEPT);
2017                                                                 MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
2018                                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2019                                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2020                                                                 SZ_Clear(&net_message);
2021                                                                 // now set up the client struct
2022                                                                 SV_VM_Begin();
2023                                                                 SV_ConnectClient(clientnum, conn);
2024                                                                 SV_VM_End();
2025                                                                 NetConn_Heartbeat(1);
2026                                                         }
2027                                                         else
2028                                                         {
2029                                                                 if (developer.integer >= 10)
2030                                                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
2031                                                                 // no room; try to let player know
2032                                                                 SZ_Clear(&net_message);
2033                                                                 // save space for the header, filled in later
2034                                                                 MSG_WriteLong(&net_message, 0);
2035                                                                 MSG_WriteByte(&net_message, CCREP_REJECT);
2036                                                                 MSG_WriteString(&net_message, "Server is full.\n");
2037                                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2038                                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2039                                                                 SZ_Clear(&net_message);
2040                                                         }
2041                                                 }
2042                                         }
2043                                 }
2044                                 break;
2045 #if 0
2046                         case CCREQ_SERVER_INFO:
2047                                 if (developer.integer >= 10)
2048                                         Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
2049                                 if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
2050                                 {
2051                                         if (developer.integer >= 10)
2052                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
2053                                         SZ_Clear(&net_message);
2054                                         // save space for the header, filled in later
2055                                         MSG_WriteLong(&net_message, 0);
2056                                         MSG_WriteByte(&net_message, CCREP_SERVER_INFO);
2057                                         UDP_GetSocketAddr(UDP_acceptSock, &newaddr);
2058                                         MSG_WriteString(&net_message, UDP_AddrToString(&newaddr));
2059                                         MSG_WriteString(&net_message, hostname.string);
2060                                         MSG_WriteString(&net_message, sv.name);
2061                                         MSG_WriteByte(&net_message, net_activeconnections);
2062                                         MSG_WriteByte(&net_message, svs.maxclients);
2063                                         MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
2064                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2065                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2066                                         SZ_Clear(&net_message);
2067                                 }
2068                                 break;
2069                         case CCREQ_PLAYER_INFO:
2070                                 if (developer.integer >= 10)
2071                                         Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
2072                                 if (sv.active)
2073                                 {
2074                                         int playerNumber, activeNumber, clientNumber;
2075                                         client_t *client;
2076
2077                                         playerNumber = MSG_ReadByte();
2078                                         activeNumber = -1;
2079                                         for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
2080                                                 if (client->active && ++activeNumber == playerNumber)
2081                                                         break;
2082                                         if (clientNumber != svs.maxclients)
2083                                         {
2084                                                 SZ_Clear(&net_message);
2085                                                 // save space for the header, filled in later
2086                                                 MSG_WriteLong(&net_message, 0);
2087                                                 MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
2088                                                 MSG_WriteByte(&net_message, playerNumber);
2089                                                 MSG_WriteString(&net_message, client->name);
2090                                                 MSG_WriteLong(&net_message, client->colors);
2091                                                 MSG_WriteLong(&net_message, (int)client->edict->fields.server->frags);
2092                                                 MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
2093                                                 MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
2094                                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2095                                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2096                                                 SZ_Clear(&net_message);
2097                                         }
2098                                 }
2099                                 break;
2100                         case CCREQ_RULE_INFO:
2101                                 if (developer.integer >= 10)
2102                                         Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
2103                                 if (sv.active)
2104                                 {
2105                                         char *prevCvarName;
2106                                         cvar_t *var;
2107
2108                                         // find the search start location
2109                                         prevCvarName = MSG_ReadString();
2110                                         var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
2111
2112                                         // send the response
2113                                         SZ_Clear(&net_message);
2114                                         // save space for the header, filled in later
2115                                         MSG_WriteLong(&net_message, 0);
2116                                         MSG_WriteByte(&net_message, CCREP_RULE_INFO);
2117                                         if (var)
2118                                         {
2119                                                 MSG_WriteString(&net_message, var->name);
2120                                                 MSG_WriteString(&net_message, var->string);
2121                                         }
2122                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2123                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2124                                         SZ_Clear(&net_message);
2125                                 }
2126                                 break;
2127 #endif
2128                         default:
2129                                 break;
2130                         }
2131                         // we may not have liked the packet, but it was a valid control
2132                         // packet, so we're done processing this packet now
2133                         return true;
2134                 }
2135         }
2136 #endif
2137         if (host_client)
2138         {
2139                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length, sv.protocol)) == 2)
2140                 {
2141                         SV_VM_Begin();
2142                         SV_ReadClientMessage();
2143                         SV_VM_End();
2144                         return ret;
2145                 }
2146         }
2147         return 0;
2148 }
2149
2150 void NetConn_ServerFrame(void)
2151 {
2152         int i, length;
2153         lhnetaddress_t peeraddress;
2154         for (i = 0;i < sv_numsockets;i++)
2155                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
2156                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
2157         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
2158         {
2159                 // never timeout loopback connections
2160                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
2161                 {
2162                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
2163                         SV_VM_Begin();
2164                         SV_DropClient(false);
2165                         SV_VM_End();
2166                 }
2167         }
2168 }
2169
2170 void NetConn_QueryMasters(qboolean querydp, qboolean queryqw)
2171 {
2172         int i;
2173         int masternum;
2174         lhnetaddress_t masteraddress;
2175         lhnetaddress_t broadcastaddress;
2176         char request[256];
2177
2178         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
2179                 return;
2180
2181         // 26000 is the default quake server port, servers on other ports will not
2182         // be found
2183         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
2184         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
2185
2186         if (querydp)
2187         {
2188                 for (i = 0;i < cl_numsockets;i++)
2189                 {
2190                         if (cl_sockets[i])
2191                         {
2192                                 // search LAN for Quake servers
2193                                 SZ_Clear(&net_message);
2194                                 // save space for the header, filled in later
2195                                 MSG_WriteLong(&net_message, 0);
2196                                 MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
2197                                 MSG_WriteString(&net_message, "QUAKE");
2198                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
2199                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2200                                 NetConn_Write(cl_sockets[i], net_message.data, net_message.cursize, &broadcastaddress);
2201                                 SZ_Clear(&net_message);
2202
2203                                 // search LAN for DarkPlaces servers
2204                                 NetConn_WriteString(cl_sockets[i], "\377\377\377\377getinfo", &broadcastaddress);
2205
2206                                 // build the getservers message to send to the dpmaster master servers
2207                                 dpsnprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
2208
2209                                 // search internet
2210                                 for (masternum = 0;sv_masters[masternum].name;masternum++)
2211                                 {
2212                                         if (sv_masters[masternum].string && sv_masters[masternum].string[0] && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, DPMASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
2213                                         {
2214                                                 masterquerycount++;
2215                                                 NetConn_WriteString(cl_sockets[i], request, &masteraddress);
2216                                         }
2217                                 }
2218                         }
2219                 }
2220         }
2221
2222         // only query QuakeWorld servers when the user wants to
2223         if (queryqw)
2224         {
2225                 for (i = 0;i < cl_numsockets;i++)
2226                 {
2227                         if (cl_sockets[i])
2228                         {
2229                                 // search LAN for QuakeWorld servers
2230                                 NetConn_WriteString(cl_sockets[i], "\377\377\377\377status\n", &broadcastaddress);
2231
2232                                 // build the getservers message to send to the qwmaster master servers
2233                                 // note this has no -1 prefix, and the trailing nul byte is sent
2234                                 dpsnprintf(request, sizeof(request), "c\n");
2235
2236                                 // search internet
2237                                 for (masternum = 0;sv_qwmasters[masternum].name;masternum++)
2238                                 {
2239                                         if (sv_qwmasters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_qwmasters[masternum].string, QWMASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
2240                                         {
2241                                                 if (m_state != m_slist)
2242                                                 {
2243                                                         char lookupstring[128];
2244                                                         LHNETADDRESS_ToString(&masteraddress, lookupstring, sizeof(lookupstring), true);
2245                                                         Con_Printf("Querying master %s (resolved from %s)\n", lookupstring, sv_qwmasters[masternum].string);
2246                                                 }
2247                                                 masterquerycount++;
2248                                                 NetConn_Write(cl_sockets[i], request, (int)strlen(request) + 1, &masteraddress);
2249                                         }
2250                                 }
2251                         }
2252                 }
2253         }
2254         if (!masterquerycount)
2255         {
2256                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
2257                 M_Update_Return_Reason("No network");
2258         }
2259 }
2260
2261 void NetConn_Heartbeat(int priority)
2262 {
2263         lhnetaddress_t masteraddress;
2264         int masternum;
2265         lhnetsocket_t *mysocket;
2266
2267         // if it's a state change (client connected), limit next heartbeat to no
2268         // more than 30 sec in the future
2269         if (priority == 1 && nextheartbeattime > realtime + 30.0)
2270                 nextheartbeattime = realtime + 30.0;
2271
2272         // limit heartbeatperiod to 30 to 270 second range,
2273         // lower limit is to avoid abusing master servers with excess traffic,
2274         // upper limit is to avoid timing out on the master server (which uses
2275         // 300 sec timeout)
2276         if (sv_heartbeatperiod.value < 30)
2277                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
2278         if (sv_heartbeatperiod.value > 270)
2279                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
2280
2281         // make advertising optional and don't advertise singleplayer games, and
2282         // only send a heartbeat as often as the admin wants
2283         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
2284         {
2285                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
2286                 for (masternum = 0;sv_masters[masternum].name;masternum++)
2287                         if (sv_masters[masternum].string && sv_masters[masternum].string[0] && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, DPMASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
2288                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
2289         }
2290 }
2291
2292 static void Net_Heartbeat_f(void)
2293 {
2294         if (sv.active)
2295                 NetConn_Heartbeat(2);
2296         else
2297                 Con_Print("No server running, can not heartbeat to master server.\n");
2298 }
2299
2300 void PrintStats(netconn_t *conn)
2301 {
2302         if ((cls.state == ca_connected && cls.protocol == PROTOCOL_QUAKEWORLD) || (sv.active && sv.protocol == PROTOCOL_QUAKEWORLD))
2303                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->qw.outgoing_sequence, conn->qw.incoming_sequence);
2304         else
2305                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->nq.sendSequence, conn->nq.receiveSequence);
2306 }
2307
2308 void Net_Stats_f(void)
2309 {
2310         netconn_t *conn;
2311         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
2312         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
2313         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
2314         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
2315         Con_Printf("packetsSent                = %i\n", packetsSent);
2316         Con_Printf("packetsReSent              = %i\n", packetsReSent);
2317         Con_Printf("packetsReceived            = %i\n", packetsReceived);
2318         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
2319         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
2320         Con_Print("connections                =\n");
2321         for (conn = netconn_list;conn;conn = conn->next)
2322                 PrintStats(conn);
2323 }
2324
2325 void Net_Slist_f(void)
2326 {
2327         ServerList_ResetMasks();
2328         serverlist_sortbyfield = SLIF_PING;
2329         serverlist_sortdescending = false;
2330     if (m_state != m_slist) {
2331                 Con_Print("Sending requests to master servers\n");
2332                 ServerList_QueryList(true, false);
2333                 serverlist_consoleoutput = true;
2334                 Con_Print("Listening for replies...\n");
2335         } else
2336                 ServerList_QueryList(true, false);
2337 }
2338
2339 void Net_SlistQW_f(void)
2340 {
2341         ServerList_ResetMasks();
2342         serverlist_sortbyfield = SLIF_PING;
2343         serverlist_sortdescending = false;
2344     if (m_state != m_slist) {
2345                 Con_Print("Sending requests to master servers\n");
2346                 ServerList_QueryList(false, true);
2347                 serverlist_consoleoutput = true;
2348                 Con_Print("Listening for replies...\n");
2349         } else
2350                 ServerList_QueryList(false, true);
2351 }
2352
2353 void NetConn_Init(void)
2354 {
2355         int i;
2356         lhnetaddress_t tempaddress;
2357         netconn_mempool = Mem_AllocPool("network connections", 0, NULL);
2358         Cmd_AddCommand("net_stats", Net_Stats_f, "print network statistics");
2359         Cmd_AddCommand("net_slist", Net_Slist_f, "query dp master servers and print all server information");
2360         Cmd_AddCommand("net_slistqw", Net_SlistQW_f, "query qw master servers and print all server information");
2361         Cmd_AddCommand("heartbeat", Net_Heartbeat_f, "send a heartbeat to the master server (updates your server information)");
2362         Cvar_RegisterVariable(&net_slist_queriespersecond);
2363         Cvar_RegisterVariable(&net_slist_queriesperframe);
2364         Cvar_RegisterVariable(&net_slist_timeout);
2365         Cvar_RegisterVariable(&net_slist_maxtries);
2366         Cvar_RegisterVariable(&net_messagetimeout);
2367         Cvar_RegisterVariable(&net_messagerejointimeout);
2368         Cvar_RegisterVariable(&net_connecttimeout);
2369         Cvar_RegisterVariable(&cl_netlocalping);
2370         Cvar_RegisterVariable(&cl_netpacketloss);
2371         Cvar_RegisterVariable(&hostname);
2372         Cvar_RegisterVariable(&developer_networking);
2373         Cvar_RegisterVariable(&cl_netport);
2374         Cvar_RegisterVariable(&sv_netport);
2375         Cvar_RegisterVariable(&net_address);
2376         //Cvar_RegisterVariable(&net_address_ipv6);
2377         Cvar_RegisterVariable(&sv_public);
2378         Cvar_RegisterVariable(&sv_heartbeatperiod);
2379         for (i = 0;sv_masters[i].name;i++)
2380                 Cvar_RegisterVariable(&sv_masters[i]);
2381         Cvar_RegisterVariable(&gameversion);
2382 // 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.
2383         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
2384         {
2385                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
2386                 {
2387                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
2388                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
2389                 }
2390                 else
2391                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
2392         }
2393 // 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
2394         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
2395         {
2396                 i = atoi(com_argv[i + 1]);
2397                 if (i >= 0 && i < 65536)
2398                 {
2399                         Con_Printf("-port option used, setting port cvar to %i\n", i);
2400                         Cvar_SetValueQuick(&sv_netport, i);
2401                 }
2402                 else
2403                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
2404         }
2405         cl_numsockets = 0;
2406         sv_numsockets = 0;
2407         net_message.data = net_message_buf;
2408         net_message.maxsize = sizeof(net_message_buf);
2409         net_message.cursize = 0;
2410         LHNET_Init();
2411 }
2412
2413 void NetConn_Shutdown(void)
2414 {
2415         NetConn_CloseClientPorts();
2416         NetConn_CloseServerPorts();
2417         LHNET_Shutdown();
2418 }
2419