implemented connect flood blocking (100% effective on connect floods with an interval...
[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_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)"};
75 cvar_t net_connectfloodblockingtimeout = {0, "net_connectfloodblockingtimeout", "5", "when a connection packet is received, it will block all future connect packets from that IP address for this many seconds (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, double newtimeout)
845 {
846         if (length < 8)
847                 return 0;
848
849         // TODO: add netgraph stuff rather than just packetloss counting...
850
851         if (protocol == PROTOCOL_QUAKEWORLD)
852         {
853                 int sequence, sequence_ack;
854                 int reliable_ack, reliable_message;
855                 int count;
856                 int qport;
857
858                 sequence = LittleLong(*((int *)(data + 0)));
859                 sequence_ack = LittleLong(*((int *)(data + 4)));
860                 data += 8;
861                 length -= 8;
862
863                 if (conn != cls.netcon)
864                 {
865                         // server only
866                         if (length < 2)
867                                 return 0;
868                         // 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?)
869                         qport = LittleShort(*((int *)(data + 8)));
870                         data += 2;
871                         length -= 2;
872                 }
873
874                 packetsReceived++;
875                 reliable_message = (sequence >> 31) & 1;
876                 reliable_ack = (sequence_ack >> 31) & 1;
877                 sequence &= ~(1<<31);
878                 sequence_ack &= ~(1<<31);
879                 if (sequence <= conn->qw.incoming_sequence)
880                 {
881                         //Con_DPrint("Got a stale datagram\n");
882                         return 0;
883                 }
884                 count = sequence - (conn->qw.incoming_sequence + 1);
885                 if (count > 0)
886                 {
887                         droppedDatagrams += count;
888                         //Con_DPrintf("Dropped %u datagram(s)\n", count);
889                         while (count--)
890                         {
891                                 conn->packetlost[conn->packetlostcounter] = true;
892                                 conn->packetlostcounter = (conn->packetlostcounter + 1) % 100;
893                         }
894                 }
895                 conn->packetlost[conn->packetlostcounter] = false;
896                 conn->packetlostcounter = (conn->packetlostcounter + 1) % 100;
897                 if (reliable_ack == conn->qw.reliable_sequence)
898                 {
899                         // received, now we will be able to send another reliable message
900                         conn->sendMessageLength = 0;
901                         reliableMessagesReceived++;
902                 }
903                 conn->qw.incoming_sequence = sequence;
904                 if (conn == cls.netcon)
905                         cls.qw_incoming_sequence = conn->qw.incoming_sequence;
906                 conn->qw.incoming_acknowledged = sequence_ack;
907                 conn->qw.incoming_reliable_acknowledged = reliable_ack;
908                 if (reliable_message)
909                         conn->qw.incoming_reliable_sequence ^= 1;
910                 conn->lastMessageTime = realtime;
911                 conn->timeout = realtime + newtimeout;
912                 unreliableMessagesReceived++;
913                 SZ_Clear(&net_message);
914                 SZ_Write(&net_message, data, length);
915                 MSG_BeginReading();
916                 return 2;
917         }
918         else
919         {
920                 unsigned int count;
921                 unsigned int flags;
922                 unsigned int sequence;
923                 int qlength;
924
925                 qlength = (unsigned int)BigLong(((int *)data)[0]);
926                 flags = qlength & ~NETFLAG_LENGTH_MASK;
927                 qlength &= NETFLAG_LENGTH_MASK;
928                 // control packets were already handled
929                 if (!(flags & NETFLAG_CTL) && qlength == length)
930                 {
931                         sequence = BigLong(((int *)data)[1]);
932                         packetsReceived++;
933                         data += 8;
934                         length -= 8;
935                         if (flags & NETFLAG_UNRELIABLE)
936                         {
937                                 if (sequence >= conn->nq.unreliableReceiveSequence)
938                                 {
939                                         if (sequence > conn->nq.unreliableReceiveSequence)
940                                         {
941                                                 count = sequence - conn->nq.unreliableReceiveSequence;
942                                                 droppedDatagrams += count;
943                                                 //Con_DPrintf("Dropped %u datagram(s)\n", count);
944                                                 while (count--)
945                                                 {
946                                                         conn->packetlost[conn->packetlostcounter] = true;
947                                                         conn->packetlostcounter = (conn->packetlostcounter + 1) % 100;
948                                                 }
949                                         }
950                                         conn->packetlost[conn->packetlostcounter] = false;
951                                         conn->packetlostcounter = (conn->packetlostcounter + 1) % 100;
952                                         conn->nq.unreliableReceiveSequence = sequence + 1;
953                                         conn->lastMessageTime = realtime;
954                                         conn->timeout = realtime + newtimeout;
955                                         unreliableMessagesReceived++;
956                                         if (length > 0)
957                                         {
958                                                 SZ_Clear(&net_message);
959                                                 SZ_Write(&net_message, data, length);
960                                                 MSG_BeginReading();
961                                                 return 2;
962                                         }
963                                 }
964                                 //else
965                                 //      Con_DPrint("Got a stale datagram\n");
966                                 return 1;
967                         }
968                         else if (flags & NETFLAG_ACK)
969                         {
970                                 if (sequence == (conn->nq.sendSequence - 1))
971                                 {
972                                         if (sequence == conn->nq.ackSequence)
973                                         {
974                                                 conn->nq.ackSequence++;
975                                                 if (conn->nq.ackSequence != conn->nq.sendSequence)
976                                                         Con_DPrint("ack sequencing error\n");
977                                                 conn->lastMessageTime = realtime;
978                                                 conn->timeout = realtime + newtimeout;
979                                                 if (conn->sendMessageLength > MAX_PACKETFRAGMENT)
980                                                 {
981                                                         unsigned int packetLen;
982                                                         unsigned int dataLen;
983                                                         unsigned int eom;
984                                                         unsigned int *header;
985
986                                                         conn->sendMessageLength -= MAX_PACKETFRAGMENT;
987                                                         memcpy(conn->sendMessage, conn->sendMessage+MAX_PACKETFRAGMENT, conn->sendMessageLength);
988
989                                                         if (conn->sendMessageLength <= MAX_PACKETFRAGMENT)
990                                                         {
991                                                                 dataLen = conn->sendMessageLength;
992                                                                 eom = NETFLAG_EOM;
993                                                         }
994                                                         else
995                                                         {
996                                                                 dataLen = MAX_PACKETFRAGMENT;
997                                                                 eom = 0;
998                                                         }
999
1000                                                         packetLen = NET_HEADERSIZE + dataLen;
1001
1002                                                         header = (unsigned int *)sendbuffer;
1003                                                         header[0] = BigLong(packetLen | (NETFLAG_DATA | eom));
1004                                                         header[1] = BigLong(conn->nq.sendSequence);
1005                                                         memcpy(sendbuffer + NET_HEADERSIZE, conn->sendMessage, dataLen);
1006
1007                                                         conn->nq.sendSequence++;
1008
1009                                                         if (NetConn_Write(conn->mysocket, (void *)&sendbuffer, packetLen, &conn->peeraddress) == (int)packetLen)
1010                                                         {
1011                                                                 conn->lastSendTime = realtime;
1012                                                                 packetsSent++;
1013                                                         }
1014                                                 }
1015                                                 else
1016                                                         conn->sendMessageLength = 0;
1017                                         }
1018                                         //else
1019                                         //      Con_DPrint("Duplicate ACK received\n");
1020                                 }
1021                                 //else
1022                                 //      Con_DPrint("Stale ACK received\n");
1023                                 return 1;
1024                         }
1025                         else if (flags & NETFLAG_DATA)
1026                         {
1027                                 unsigned int temppacket[2];
1028                                 temppacket[0] = BigLong(8 | NETFLAG_ACK);
1029                                 temppacket[1] = BigLong(sequence);
1030                                 NetConn_Write(conn->mysocket, (unsigned char *)temppacket, 8, &conn->peeraddress);
1031                                 if (sequence == conn->nq.receiveSequence)
1032                                 {
1033                                         conn->lastMessageTime = realtime;
1034                                         conn->timeout = realtime + newtimeout;
1035                                         conn->nq.receiveSequence++;
1036                                         if( conn->receiveMessageLength + length <= (int)sizeof( conn->receiveMessage ) ) {
1037                                                 memcpy(conn->receiveMessage + conn->receiveMessageLength, data, length);
1038                                                 conn->receiveMessageLength += length;
1039                                         } else {
1040                                                 Con_Printf( "Reliable message (seq: %i) too big for message buffer!\n"
1041                                                                         "Dropping the message!\n", sequence );
1042                                                 conn->receiveMessageLength = 0;
1043                                                 return 1;
1044                                         }
1045                                         if (flags & NETFLAG_EOM)
1046                                         {
1047                                                 reliableMessagesReceived++;
1048                                                 length = conn->receiveMessageLength;
1049                                                 conn->receiveMessageLength = 0;
1050                                                 if (length > 0)
1051                                                 {
1052                                                         SZ_Clear(&net_message);
1053                                                         SZ_Write(&net_message, conn->receiveMessage, length);
1054                                                         MSG_BeginReading();
1055                                                         return 2;
1056                                                 }
1057                                         }
1058                                 }
1059                                 else
1060                                         receivedDuplicateCount++;
1061                                 return 1;
1062                         }
1063                 }
1064         }
1065         return 0;
1066 }
1067
1068 void NetConn_ConnectionEstablished(lhnetsocket_t *mysocket, lhnetaddress_t *peeraddress, protocolversion_t initialprotocol)
1069 {
1070         cls.connect_trying = false;
1071         M_Update_Return_Reason("");
1072         // the connection request succeeded, stop current connection and set up a new connection
1073         CL_Disconnect();
1074         // if we're connecting to a remote server, shut down any local server
1075         if (LHNETADDRESS_GetAddressType(peeraddress) != LHNETADDRESSTYPE_LOOP && sv.active)
1076                 Host_ShutdownServer ();
1077         // allocate a net connection to keep track of things
1078         cls.netcon = NetConn_Open(mysocket, peeraddress);
1079         Con_Printf("Connection accepted to %s\n", cls.netcon->address);
1080         key_dest = key_game;
1081         m_state = m_none;
1082         cls.demonum = -1;                       // not in the demo loop now
1083         cls.state = ca_connected;
1084         cls.signon = 0;                         // need all the signon messages before playing
1085         cls.protocol = initialprotocol;
1086         if (cls.protocol == PROTOCOL_QUAKEWORLD)
1087                 Cmd_ForwardStringToServer("new");
1088         if (cls.protocol == PROTOCOL_QUAKE)
1089         {
1090                 // write a keepalive (svc_nop) as it seems to greatly improve the
1091                 // chances of connecting to a netquake server
1092                 sizebuf_t msg;
1093                 unsigned char buf[4];
1094                 memset(&msg, 0, sizeof(msg));
1095                 msg.data = buf;
1096                 msg.maxsize = sizeof(buf);
1097                 MSG_WriteChar(&msg, svc_nop);
1098                 NetConn_SendUnreliableMessage(cls.netcon, &msg, cls.protocol);
1099         }
1100 }
1101
1102 int NetConn_IsLocalGame(void)
1103 {
1104         if (cls.state == ca_connected && sv.active && cl.maxclients == 1)
1105                 return true;
1106         return false;
1107 }
1108
1109 static int NetConn_ClientParsePacket_ServerList_ProcessReply(const char *addressstring)
1110 {
1111         int n;
1112         int pingtime;
1113         // search the cache for this server and update it
1114         for (n = 0;n < serverlist_cachecount;n++)
1115                 if (!strcmp(addressstring, serverlist_cache[n].info.cname))
1116                         break;
1117         if (n == serverlist_cachecount)
1118         {
1119                 // LAN search doesnt require an answer from the master server so we wont
1120                 // know the ping nor will it be initialized already...
1121
1122                 // find a slot
1123                 if (serverlist_cachecount == SERVERLIST_TOTALSIZE)
1124                         return -1;
1125
1126                 memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1127                 // store the data the engine cares about (address and ping)
1128                 strlcpy(serverlist_cache[serverlist_cachecount].info.cname, addressstring, sizeof(serverlist_cache[serverlist_cachecount].info.cname));
1129                 serverlist_cache[serverlist_cachecount].info.ping = 100000;
1130                 //serverlist_cache[serverlist_cachecount].querytime = realtime;
1131                 serverlist_cache[serverlist_cachecount].querytime = Sys_DoubleTime();
1132                 // if not in the slist menu we should print the server to console
1133                 if (serverlist_consoleoutput)
1134                         Con_Printf("querying %s\n", addressstring);
1135                 ++serverlist_cachecount;
1136         }
1137         // if this is the first reply from this server, count it as having replied
1138         if (serverlist_cache[n].info.ping == 100000)
1139                 serverreplycount++;
1140         pingtime = (int)((Sys_DoubleTime() - serverlist_cache[n].querytime) * 1000.0 + 0.5);
1141         pingtime = bound(0, pingtime, 9999);
1142         // update the ping
1143         serverlist_cache[n].info.ping = min(serverlist_cache[n].info.ping, pingtime);
1144         // other server info is updated by the caller
1145         return n;
1146 }
1147
1148 static void NetConn_ClientParsePacket_ServerList_UpdateCache(int n)
1149 {
1150         serverlist_info_t *info = &serverlist_cache[n].info;
1151         // update description strings for engine menu and console output
1152         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);
1153         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);
1154         if (serverlist_cache[n].query == SQS_QUERIED)
1155                 ServerList_ViewList_Remove(&serverlist_cache[n]);
1156         // if not in the slist menu we should print the server to console (if wanted)
1157         else if( serverlist_consoleoutput )
1158                 Con_Printf("%s\n%s\n", serverlist_cache[n].line1, serverlist_cache[n].line2);
1159         // and finally, update the view set
1160         ServerList_ViewList_Insert( &serverlist_cache[n] );
1161         serverlist_cache[n].query = SQS_QUERIED;
1162 }
1163
1164 static int NetConn_ClientParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1165 {
1166         qboolean fromserver;
1167         int ret, c, control;
1168         const char *s;
1169         char *string, addressstring2[128], ipstring[32];
1170         char stringbuf[16384];
1171
1172         // quakeworld ingame packet
1173         fromserver = cls.netcon && mysocket == cls.netcon->mysocket && !LHNETADDRESS_Compare(&cls.netcon->peeraddress, peeraddress);
1174
1175         // convert the address to a string incase we need it
1176         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1177
1178         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1179         {
1180                 // received a command string - strip off the packaging and put it
1181                 // into our string buffer with NULL termination
1182                 data += 4;
1183                 length -= 4;
1184                 length = min(length, (int)sizeof(stringbuf) - 1);
1185                 memcpy(stringbuf, data, length);
1186                 stringbuf[length] = 0;
1187                 string = stringbuf;
1188
1189                 if (developer_networking.integer)
1190                 {
1191                         Con_Printf("NetConn_ClientParsePacket: %s sent us a command:\n", addressstring2);
1192                         Com_HexDumpToConsole(data, length);
1193                 }
1194
1195                 if (length > 10 && !memcmp(string, "challenge ", 10) && cls.connect_trying)
1196                 {
1197                         // darkplaces or quake3
1198                         char protocolnames[1400];
1199                         Protocol_Names(protocolnames, sizeof(protocolnames));
1200                         Con_Printf("\"%s\" received, sending connect request back to %s\n", string, addressstring2);
1201                         M_Update_Return_Reason("Got challenge response");
1202                         // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1203                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1204                         // TODO: add userinfo stuff here instead of using NQ commands?
1205                         NetConn_WriteString(mysocket, va("\377\377\377\377connect\\protocol\\darkplaces 3\\protocols\\%s\\challenge\\%s", protocolnames, string + 10), peeraddress);
1206                         return true;
1207                 }
1208                 if (length == 6 && !memcmp(string, "accept", 6) && cls.connect_trying)
1209                 {
1210                         // darkplaces or quake3
1211                         M_Update_Return_Reason("Accepted");
1212                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_DARKPLACES3);
1213                         return true;
1214                 }
1215                 if (length > 7 && !memcmp(string, "reject ", 7) && cls.connect_trying)
1216                 {
1217                         char rejectreason[32];
1218                         cls.connect_trying = false;
1219                         string += 7;
1220                         length = max(length - 7, (int)sizeof(rejectreason) - 1);
1221                         memcpy(rejectreason, string, length);
1222                         rejectreason[length] = 0;
1223                         M_Update_Return_Reason(rejectreason);
1224                         return true;
1225                 }
1226                 if (length >= 13 && !memcmp(string, "infoResponse\x0A", 13))
1227                 {
1228                         serverlist_info_t *info;
1229                         int n;
1230
1231                         string += 13;
1232                         // search the cache for this server and update it
1233                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1234                         if (n < 0)
1235                                 return true;
1236
1237                         info = &serverlist_cache[n].info;
1238                         if ((s = SearchInfostring(string, "gamename"     )) != NULL) strlcpy(info->game, s, sizeof (info->game));else info->game[0] = 0;
1239                         if ((s = SearchInfostring(string, "modname"      )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1240                         if ((s = SearchInfostring(string, "mapname"      )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1241                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1242                         if ((s = SearchInfostring(string, "protocol"     )) != NULL) info->protocol = atoi(s);else info->protocol = -1;
1243                         if ((s = SearchInfostring(string, "clients"      )) != NULL) info->numplayers = atoi(s);else info->numplayers = 0;
1244                         if ((s = SearchInfostring(string, "sv_maxclients")) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1245                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);else info->gameversion = 0;
1246
1247                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1248
1249                         return true;
1250                 }
1251                 if (!strncmp(string, "getserversResponse\\", 19) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1252                 {
1253                         // Extract the IP addresses
1254                         data += 18;
1255                         length -= 18;
1256                         masterreplycount++;
1257                         if (serverlist_consoleoutput)
1258                                 Con_Print("received DarkPlaces server list...\n");
1259                         while (length >= 7 && data[0] == '\\' && (data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF || data[4] != 0xFF) && data[5] * 256 + data[6] != 0)
1260                         {
1261                                 int n;
1262
1263                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[1], data[2], data[3], data[4], data[5] * 256 + data[6]);
1264                                 if (serverlist_consoleoutput && developer_networking.integer)
1265                                         Con_Printf("Requesting info from DarkPlaces server %s\n", ipstring);
1266                                 // ignore the rest of the message if the serverlist is full
1267                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1268                                         break;
1269                                 // also ignore it if we have already queried it (other master server response)
1270                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1271                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1272                                                 break;
1273                                 if( n >= serverlist_cachecount )
1274                                 {
1275                                         serverquerycount++;
1276
1277                                         memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1278                                         serverlist_cache[serverlist_cachecount].protocol = PROTOCOL_DARKPLACES7;
1279                                         // store the data the engine cares about (address and ping)
1280                                         strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1281                                         serverlist_cache[serverlist_cachecount].info.ping = 100000;
1282                                         serverlist_cache[serverlist_cachecount].query = SQS_QUERYING;
1283
1284                                         ++serverlist_cachecount;
1285                                 }
1286
1287                                 // move on to next address in packet
1288                                 data += 7;
1289                                 length -= 7;
1290                         }
1291                         // begin or resume serverlist queries
1292                         serverlist_querysleep = false;
1293                         serverlist_querywaittime = realtime + 3;
1294                         return true;
1295                 }
1296                 if (!memcmp(string, "d\n", 2) && serverlist_cachecount < SERVERLIST_TOTALSIZE)
1297                 {
1298                         // Extract the IP addresses
1299                         data += 2;
1300                         length -= 2;
1301                         masterreplycount++;
1302                         if (serverlist_consoleoutput)
1303                                 Con_Printf("received QuakeWorld server list from %s...\n", addressstring2);
1304                         while (length >= 6 && (data[0] != 0xFF || data[1] != 0xFF || data[2] != 0xFF || data[3] != 0xFF) && data[4] * 256 + data[5] != 0)
1305                         {
1306                                 int n;
1307
1308                                 dpsnprintf (ipstring, sizeof (ipstring), "%u.%u.%u.%u:%u", data[0], data[1], data[2], data[3], data[4] * 256 + data[5]);
1309                                 if (serverlist_consoleoutput && developer_networking.integer)
1310                                         Con_Printf("Requesting info from QuakeWorld server %s\n", ipstring);
1311                                 // ignore the rest of the message if the serverlist is full
1312                                 if( serverlist_cachecount == SERVERLIST_TOTALSIZE )
1313                                         break;
1314                                 // also ignore it if we have already queried it (other master server response)
1315                                 for( n = 0 ; n < serverlist_cachecount ; n++ )
1316                                         if( !strcmp( ipstring, serverlist_cache[ n ].info.cname ) )
1317                                                 break;
1318                                 if( n >= serverlist_cachecount )
1319                                 {
1320                                         serverquerycount++;
1321
1322                                         memset(&serverlist_cache[serverlist_cachecount], 0, sizeof(serverlist_cache[serverlist_cachecount]));
1323                                         serverlist_cache[serverlist_cachecount].protocol = PROTOCOL_QUAKEWORLD;
1324                                         // store the data the engine cares about (address and ping)
1325                                         strlcpy (serverlist_cache[serverlist_cachecount].info.cname, ipstring, sizeof (serverlist_cache[serverlist_cachecount].info.cname));
1326                                         serverlist_cache[serverlist_cachecount].info.ping = 100000;
1327                                         serverlist_cache[serverlist_cachecount].query = SQS_QUERYING;
1328
1329                                         ++serverlist_cachecount;
1330                                 }
1331
1332                                 // move on to next address in packet
1333                                 data += 6;
1334                                 length -= 6;
1335                         }
1336                         // begin or resume serverlist queries
1337                         serverlist_querysleep = false;
1338                         serverlist_querywaittime = realtime + 3;
1339                         return true;
1340                 }
1341                 if (!strncmp(string, "ping", 4))
1342                 {
1343                         if (developer.integer >= 10)
1344                                 Con_Printf("Received ping from %s, sending ack\n", addressstring2);
1345                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1346                         return true;
1347                 }
1348                 if (!strncmp(string, "ack", 3))
1349                         return true;
1350                 // QuakeWorld compatibility
1351                 if (length > 1 && string[0] == 'c' && (string[1] == '-' || (string[1] >= '0' && string[1] <= '9')) && cls.connect_trying)
1352                 {
1353                         // challenge message
1354                         Con_Printf("challenge %s received, sending QuakeWorld connect request back to %s\n", string + 1, addressstring2);
1355                         M_Update_Return_Reason("Got QuakeWorld challenge response");
1356                         cls.qw_qport = qport.integer;
1357                         // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1358                         InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1359                         NetConn_WriteString(mysocket, va("\377\377\377\377connect %i %i %i \"%s\"\n", 28, cls.qw_qport, atoi(string + 1), cls.userinfo), peeraddress);
1360                         return true;
1361                 }
1362                 if (length >= 1 && string[0] == 'j' && cls.connect_trying)
1363                 {
1364                         // accept message
1365                         M_Update_Return_Reason("QuakeWorld Accepted");
1366                         NetConn_ConnectionEstablished(mysocket, peeraddress, PROTOCOL_QUAKEWORLD);
1367                         return true;
1368                 }
1369                 if (length > 2 && !memcmp(string, "n\\", 2))
1370                 {
1371                         serverlist_info_t *info;
1372                         int n;
1373
1374                         // qw server status
1375                         if (serverlist_consoleoutput && developer_networking.integer >= 2)
1376                                 Con_Printf("QW server status from server at %s:\n%s\n", addressstring2, string + 1);
1377
1378                         string += 1;
1379                         // search the cache for this server and update it
1380                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1381                         if (n < 0)
1382                                 return true;
1383
1384                         info = &serverlist_cache[n].info;
1385                         strlcpy(info->game, "QuakeWorld", sizeof(info->game));;
1386                         if ((s = SearchInfostring(string, "*gamedir"     )) != NULL) strlcpy(info->mod , s, sizeof (info->mod ));else info->mod[0]  = 0;
1387                         if ((s = SearchInfostring(string, "map"          )) != NULL) strlcpy(info->map , s, sizeof (info->map ));else info->map[0]  = 0;
1388                         if ((s = SearchInfostring(string, "hostname"     )) != NULL) strlcpy(info->name, s, sizeof (info->name));else info->name[0] = 0;
1389                         info->protocol = 0;
1390                         info->numplayers = 0; // updated below
1391                         if ((s = SearchInfostring(string, "maxclients"   )) != NULL) info->maxplayers = atoi(s);else info->maxplayers  = 0;
1392                         if ((s = SearchInfostring(string, "gameversion"  )) != NULL) info->gameversion = atoi(s);else info->gameversion = 0;
1393
1394                         // count active players on server
1395                         // (we could gather more info, but we're just after the number)
1396                         s = strchr(string, '\n');
1397                         if (s)
1398                         {
1399                                 s++;
1400                                 while (s < string + length)
1401                                 {
1402                                         for (;s < string + length && *s != '\n';s++)
1403                                                 ;
1404                                         if (s >= string + length)
1405                                                 break;
1406                                         info->numplayers++;
1407                                         s++;
1408                                 }
1409                         }
1410
1411                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1412
1413                         return true;
1414                 }
1415                 if (string[0] == 'n')
1416                 {
1417                         // qw print command
1418                         Con_Printf("QW print command from server at %s:\n%s\n", addressstring2, string + 1);
1419                 }
1420                 // we may not have liked the packet, but it was a command packet, so
1421                 // we're done processing this packet now
1422                 return true;
1423         }
1424         // quakeworld ingame packet
1425         if (fromserver && cls.protocol == PROTOCOL_QUAKEWORLD && length >= 8 && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol, net_messagetimeout.value)) == 2)
1426         {
1427                 ret = 0;
1428                 CL_ParseServerMessage();
1429                 return ret;
1430         }
1431         // netquake control packets, supported for compatibility only
1432         if (length >= 5 && (control = BigLong(*((int *)data))) && (control & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (control & NETFLAG_LENGTH_MASK) == length)
1433         {
1434                 int n;
1435                 serverlist_info_t *info;
1436
1437                 c = data[4];
1438                 data += 5;
1439                 length -= 5;
1440                 switch (c)
1441                 {
1442                 case CCREP_ACCEPT:
1443                         if (developer.integer >= 10)
1444                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_ACCEPT from %s.\n", addressstring2);
1445                         if (cls.connect_trying)
1446                         {
1447                                 lhnetaddress_t clientportaddress;
1448                                 clientportaddress = *peeraddress;
1449                                 if (length >= 4)
1450                                 {
1451                                         unsigned int port = (data[0] << 0) | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
1452                                         data += 4;
1453                                         length -= 4;
1454                                         LHNETADDRESS_SetPort(&clientportaddress, port);
1455                                 }
1456                                 // update the server IP in the userinfo (QW servers expect this, and it is used by the reconnect command)
1457                                 InfoString_SetValue(cls.userinfo, sizeof(cls.userinfo), "*ip", addressstring2);
1458                                 M_Update_Return_Reason("Accepted");
1459                                 NetConn_ConnectionEstablished(mysocket, &clientportaddress, PROTOCOL_QUAKE);
1460                         }
1461                         break;
1462                 case CCREP_REJECT:
1463                         if (developer.integer >= 10)
1464                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_REJECT from %s.\n", addressstring2);
1465                         cls.connect_trying = false;
1466                         M_Update_Return_Reason((char *)data);
1467                         break;
1468                 case CCREP_SERVER_INFO:
1469                         if (developer.integer >= 10)
1470                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_SERVER_INFO from %s.\n", addressstring2);
1471                         // LordHavoc: because the quake server may report weird addresses
1472                         // we just ignore it and keep the real address
1473                         MSG_ReadString();
1474                         // search the cache for this server and update it
1475                         n = NetConn_ClientParsePacket_ServerList_ProcessReply(addressstring2);
1476                         if (n < 0)
1477                                 break;
1478
1479                         info = &serverlist_cache[n].info;
1480                         strlcpy(info->game, "Quake", sizeof(info->game));
1481                         strlcpy(info->mod , "", sizeof(info->mod)); // mod name is not specified
1482                         strlcpy(info->name, MSG_ReadString(), sizeof(info->name));
1483                         strlcpy(info->map , MSG_ReadString(), sizeof(info->map));
1484                         info->numplayers = MSG_ReadByte();
1485                         info->maxplayers = MSG_ReadByte();
1486                         info->protocol = MSG_ReadByte();
1487
1488                         NetConn_ClientParsePacket_ServerList_UpdateCache(n);
1489
1490                         break;
1491                 case CCREP_PLAYER_INFO:
1492                         // we got a CCREP_PLAYER_INFO??
1493                         //if (developer.integer >= 10)
1494                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_PLAYER_INFO from %s.\n", addressstring2);
1495                         break;
1496                 case CCREP_RULE_INFO:
1497                         // we got a CCREP_RULE_INFO??
1498                         //if (developer.integer >= 10)
1499                                 Con_Printf("Datagram_ParseConnectionless: received CCREP_RULE_INFO from %s.\n", addressstring2);
1500                         break;
1501                 default:
1502                         break;
1503                 }
1504                 // we may not have liked the packet, but it was a valid control
1505                 // packet, so we're done processing this packet now
1506                 return true;
1507         }
1508         ret = 0;
1509         if (fromserver && length >= (int)NET_HEADERSIZE && (ret = NetConn_ReceivedMessage(cls.netcon, data, length, cls.protocol, net_messagetimeout.value)) == 2)
1510                 CL_ParseServerMessage();
1511         return ret;
1512 }
1513
1514 void NetConn_QueryQueueFrame(void)
1515 {
1516         int index;
1517         int queries;
1518         int maxqueries;
1519         double timeouttime;
1520         static double querycounter = 0;
1521
1522         if (serverlist_querysleep)
1523                 return;
1524
1525         // apply a cool down time after master server replies,
1526         // to avoid messing up the ping times on the servers
1527         if (serverlist_querywaittime > realtime)
1528                 return;
1529
1530         // each time querycounter reaches 1.0 issue a query
1531         querycounter += cl.realframetime * net_slist_queriespersecond.value;
1532         maxqueries = (int)querycounter;
1533         maxqueries = bound(0, maxqueries, net_slist_queriesperframe.integer);
1534         querycounter -= maxqueries;
1535
1536         if( maxqueries == 0 ) {
1537                 return;
1538         }
1539
1540         // scan serverlist and issue queries as needed
1541     serverlist_querysleep = true;
1542
1543         timeouttime = realtime - net_slist_timeout.value;
1544         for( index = 0, queries = 0 ; index < serverlist_cachecount && queries < maxqueries ; index++ )
1545         {
1546                 serverlist_entry_t *entry = &serverlist_cache[ index ];
1547                 if( entry->query != SQS_QUERYING )
1548                 {
1549                         continue;
1550                 }
1551
1552         serverlist_querysleep = false;
1553                 if( entry->querycounter != 0 && entry->querytime > timeouttime )
1554                 {
1555                         continue;
1556                 }
1557
1558                 if( entry->querycounter != (unsigned) net_slist_maxtries.integer )
1559                 {
1560                         lhnetaddress_t address;
1561                         int socket;
1562
1563                         LHNETADDRESS_FromString(&address, entry->info.cname, 0);
1564                         if (entry->protocol == PROTOCOL_QUAKEWORLD)
1565                         {
1566                                 for (socket = 0; socket < cl_numsockets ; socket++)
1567                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377status\n", &address);
1568                         }
1569                         else
1570                         {
1571                                 for (socket = 0; socket < cl_numsockets ; socket++)
1572                                         NetConn_WriteString(cl_sockets[socket], "\377\377\377\377getinfo", &address);
1573                         }
1574
1575                         //entry->querytime = realtime;
1576                         entry->querytime = Sys_DoubleTime();
1577                         entry->querycounter++;
1578
1579                         // if not in the slist menu we should print the server to console
1580                         if (serverlist_consoleoutput)
1581                                 Con_Printf("querying %25s (%i. try)\n", entry->info.cname, entry->querycounter);
1582
1583                         queries++;
1584                 }
1585                 else
1586                 {
1587                         entry->query = SQS_TIMEDOUT;
1588                 }
1589         }
1590 }
1591
1592 void NetConn_ClientFrame(void)
1593 {
1594         int i, length;
1595         lhnetaddress_t peeraddress;
1596         NetConn_UpdateSockets();
1597         if (cls.connect_trying && cls.connect_nextsendtime < realtime)
1598         {
1599                 if (cls.connect_remainingtries == 0)
1600                         M_Update_Return_Reason("Connect: Waiting 10 seconds for reply");
1601                 cls.connect_nextsendtime = realtime + 1;
1602                 cls.connect_remainingtries--;
1603                 if (cls.connect_remainingtries <= -10)
1604                 {
1605                         cls.connect_trying = false;
1606                         M_Update_Return_Reason("Connect: Failed");
1607                         return;
1608                 }
1609                 // try challenge first (newer DP server or QW)
1610                 NetConn_WriteString(cls.connect_mysocket, "\377\377\377\377getchallenge", &cls.connect_address);
1611                 // then try netquake as a fallback (old server, or netquake)
1612                 SZ_Clear(&net_message);
1613                 // save space for the header, filled in later
1614                 MSG_WriteLong(&net_message, 0);
1615                 MSG_WriteByte(&net_message, CCREQ_CONNECT);
1616                 MSG_WriteString(&net_message, "QUAKE");
1617                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
1618                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
1619                 NetConn_Write(cls.connect_mysocket, net_message.data, net_message.cursize, &cls.connect_address);
1620                 SZ_Clear(&net_message);
1621         }
1622         for (i = 0;i < cl_numsockets;i++)
1623                 while (cl_sockets[i] && (length = NetConn_Read(cl_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
1624                         NetConn_ClientParsePacket(cl_sockets[i], readbuffer, length, &peeraddress);
1625         NetConn_QueryQueueFrame();
1626         if (cls.netcon && realtime > cls.netcon->timeout)
1627         {
1628                 Con_Print("Connection timed out\n");
1629                 CL_Disconnect();
1630                 Host_ShutdownServer ();
1631         }
1632 }
1633
1634 #define MAX_CHALLENGES 128
1635 struct challenge_s
1636 {
1637         lhnetaddress_t address;
1638         double time;
1639         char string[12];
1640 }
1641 challenge[MAX_CHALLENGES];
1642
1643 static void NetConn_BuildChallengeString(char *buffer, int bufferlength)
1644 {
1645         int i;
1646         char c;
1647         for (i = 0;i < bufferlength - 1;i++)
1648         {
1649                 do
1650                 {
1651                         c = rand () % (127 - 33) + 33;
1652                 } while (c == '\\' || c == ';' || c == '"' || c == '%' || c == '/');
1653                 buffer[i] = c;
1654         }
1655         buffer[i] = 0;
1656 }
1657
1658 static qboolean NetConn_BuildStatusResponse(const char* challenge, char* out_msg, size_t out_size, qboolean fullstatus)
1659 {
1660         unsigned int nb_clients = 0, i;
1661         int length;
1662
1663         // How many clients are there?
1664         for (i = 0;i < (unsigned int)svs.maxclients;i++)
1665                 if (svs.clients[i].active)
1666                         nb_clients++;
1667
1668         // TODO: we should add more information for the full status string
1669         length = dpsnprintf(out_msg, out_size,
1670                                                 "\377\377\377\377%s\x0A"
1671                                                 "\\gamename\\%s\\modname\\%s\\gameversion\\%d\\sv_maxclients\\%d"
1672                                                 "\\clients\\%d\\mapname\\%s\\hostname\\%s\\protocol\\%d"
1673                                                 "%s%s"
1674                                                 "%s",
1675                                                 fullstatus ? "statusResponse" : "infoResponse",
1676                                                 gamename, com_modname, gameversion.integer, svs.maxclients,
1677                                                 nb_clients, sv.name, hostname.string, NET_PROTOCOL_VERSION,
1678                                                 challenge ? "\\challenge\\" : "", challenge ? challenge : "",
1679                                                 fullstatus ? "\n" : "");
1680
1681         // Make sure it fits in the buffer
1682         if (length < 0)
1683                 return false;
1684
1685         if (fullstatus)
1686         {
1687                 char *ptr;
1688                 int left;
1689
1690                 ptr = out_msg + length;
1691                 left = (int)out_size - length;
1692
1693                 for (i = 0;i < (unsigned int)svs.maxclients;i++)
1694                 {
1695                         client_t *cl = &svs.clients[i];
1696                         if (cl->active)
1697                         {
1698                                 int nameind, cleanind;
1699                                 char curchar;
1700                                 char cleanname [sizeof(cl->name)];
1701
1702                                 // Remove all characters '"' and '\' in the player name
1703                                 nameind = 0;
1704                                 cleanind = 0;
1705                                 do
1706                                 {
1707                                         curchar = cl->name[nameind++];
1708                                         if (curchar != '"' && curchar != '\\')
1709                                         {
1710                                                 cleanname[cleanind++] = curchar;
1711                                                 if (cleanind == sizeof(cleanname) - 1)
1712                                                         break;
1713                                         }
1714                                 } while (curchar != '\0');
1715
1716                                 length = dpsnprintf(ptr, left, "%d %d \"%s\"\n",
1717                                                                         cl->frags,
1718                                                                         (int)(cl->ping * 1000.0f),
1719                                                                         cleanname);
1720                                 if(length < 0)
1721                                         return false;
1722                                 left -= length;
1723                                 ptr += length;
1724                         }
1725                 }
1726         }
1727
1728         return true;
1729 }
1730
1731 static qboolean NetConn_PreventConnectFlood(lhnetaddress_t *peeraddress)
1732 {
1733         int floodslotnum, bestfloodslotnum;
1734         double bestfloodtime;
1735         lhnetaddress_t noportpeeraddress;
1736         // see if this is a connect flood
1737         noportpeeraddress = *peeraddress;
1738         LHNETADDRESS_SetPort(&noportpeeraddress, 0);
1739         bestfloodslotnum = 0;
1740         bestfloodtime = sv.connectfloodaddresses[bestfloodslotnum].lasttime;
1741         for (floodslotnum = 0;floodslotnum < MAX_CONNECTFLOODADDRESSES;floodslotnum++)
1742         {
1743                 if (bestfloodtime >= sv.connectfloodaddresses[floodslotnum].lasttime)
1744                 {
1745                         bestfloodtime = sv.connectfloodaddresses[floodslotnum].lasttime;
1746                         bestfloodslotnum = floodslotnum;
1747                 }
1748                 if (sv.connectfloodaddresses[floodslotnum].lasttime && LHNETADDRESS_Compare(&noportpeeraddress, &sv.connectfloodaddresses[floodslotnum].address) == 0)
1749                 {
1750                         // this address matches an ongoing flood address
1751                         if (realtime < sv.connectfloodaddresses[floodslotnum].lasttime + net_connectfloodblockingtimeout.value)
1752                         {
1753                                 // renew the ban on this address so it does not expire
1754                                 // until the flood has subsided
1755                                 sv.connectfloodaddresses[floodslotnum].lasttime = realtime;
1756                                 return true;
1757                         }
1758                         // the flood appears to have subsided, so allow this
1759                         bestfloodslotnum = floodslotnum; // reuse the same slot
1760                         break;
1761                 }
1762         }
1763         // begin a new timeout on this address
1764         sv.connectfloodaddresses[bestfloodslotnum].address = noportpeeraddress;
1765         sv.connectfloodaddresses[bestfloodslotnum].lasttime = realtime;
1766         return false;
1767 }
1768
1769 extern void SV_SendServerinfo (client_t *client);
1770 static int NetConn_ServerParsePacket(lhnetsocket_t *mysocket, unsigned char *data, int length, lhnetaddress_t *peeraddress)
1771 {
1772         int i, ret, clientnum, best;
1773         double besttime;
1774         client_t *client;
1775         char *s, *string, response[1400], addressstring2[128], stringbuf[16384];
1776
1777         if (!sv.active)
1778                 return false;
1779
1780         // convert the address to a string incase we need it
1781         LHNETADDRESS_ToString(peeraddress, addressstring2, sizeof(addressstring2), true);
1782
1783         // see if we can identify the sender as a local player
1784         // (this is necessary for rcon to send a reliable reply if the client is
1785         //  actually on the server, not sending remotely)
1786         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
1787                 if (host_client->netconnection && host_client->netconnection->mysocket == mysocket && !LHNETADDRESS_Compare(&host_client->netconnection->peeraddress, peeraddress))
1788                         break;
1789         if (i == svs.maxclients)
1790                 host_client = NULL;
1791
1792         if (length >= 5 && data[0] == 255 && data[1] == 255 && data[2] == 255 && data[3] == 255)
1793         {
1794                 // received a command string - strip off the packaging and put it
1795                 // into our string buffer with NULL termination
1796                 data += 4;
1797                 length -= 4;
1798                 length = min(length, (int)sizeof(stringbuf) - 1);
1799                 memcpy(stringbuf, data, length);
1800                 stringbuf[length] = 0;
1801                 string = stringbuf;
1802
1803                 if (developer.integer >= 10)
1804                 {
1805                         Con_Printf("NetConn_ServerParsePacket: %s sent us a command:\n", addressstring2);
1806                         Com_HexDumpToConsole(data, length);
1807                 }
1808
1809                 if (length >= 12 && !memcmp(string, "getchallenge", 12))
1810                 {
1811                         for (i = 0, best = 0, besttime = realtime;i < MAX_CHALLENGES;i++)
1812                         {
1813                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address))
1814                                         break;
1815                                 if (besttime > challenge[i].time)
1816                                         besttime = challenge[best = i].time;
1817                         }
1818                         // if we did not find an exact match, choose the oldest and
1819                         // update address and string
1820                         if (i == MAX_CHALLENGES)
1821                         {
1822                                 i = best;
1823                                 challenge[i].address = *peeraddress;
1824                                 NetConn_BuildChallengeString(challenge[i].string, sizeof(challenge[i].string));
1825                         }
1826                         challenge[i].time = realtime;
1827                         // send the challenge
1828                         NetConn_WriteString(mysocket, va("\377\377\377\377challenge %s", challenge[i].string), peeraddress);
1829                         return true;
1830                 }
1831                 if (length > 8 && !memcmp(string, "connect\\", 8))
1832                 {
1833                         string += 7;
1834                         length -= 7;
1835
1836                         if (!(s = SearchInfostring(string, "challenge")))
1837                                 return true;
1838                         // validate the challenge
1839                         for (i = 0;i < MAX_CHALLENGES;i++)
1840                                 if (!LHNETADDRESS_Compare(peeraddress, &challenge[i].address) && !strcmp(challenge[i].string, s))
1841                                         break;
1842                         // if the challenge is not recognized, drop the packet
1843                         if (i == MAX_CHALLENGES)
1844                                 return true;
1845
1846                         // check engine protocol
1847                         if (strcmp(SearchInfostring(string, "protocol"), "darkplaces 3"))
1848                         {
1849                                 if (developer.integer >= 10)
1850                                         Con_Printf("Datagram_ParseConnectionless: sending \"reject Wrong game protocol.\" to %s.\n", addressstring2);
1851                                 NetConn_WriteString(mysocket, "\377\377\377\377reject Wrong game protocol.", peeraddress);
1852                                 return true;
1853                         }
1854
1855                         // see if this is a duplicate connection request or a disconnected
1856                         // client who is rejoining to the same client slot
1857                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1858                         {
1859                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
1860                                 {
1861                                         // this is a known client...
1862                                         if (client->spawned)
1863                                         {
1864                                                 // client crashed and is coming back,
1865                                                 // keep their stuff intact
1866                                                 if (developer.integer >= 10)
1867                                                         Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", addressstring2);
1868                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1869                                                 SV_SendServerinfo(client);
1870                                         }
1871                                         else
1872                                         {
1873                                                 // client is still trying to connect,
1874                                                 // so we send a duplicate reply
1875                                                 if (developer.integer >= 10)
1876                                                         Con_Printf("Datagram_ParseConnectionless: sending duplicate accept to %s.\n", addressstring2);
1877                                                 NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1878                                         }
1879                                         return true;
1880                                 }
1881                         }
1882
1883                         if (NetConn_PreventConnectFlood(peeraddress))
1884                                 return true;
1885
1886                         // find an empty client slot for this new client
1887                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
1888                         {
1889                                 netconn_t *conn;
1890                                 if (!client->active && (conn = NetConn_Open(mysocket, peeraddress)))
1891                                 {
1892                                         // allocated connection
1893                                         if (developer.integer >= 10)
1894                                                 Con_Printf("Datagram_ParseConnectionless: sending \"accept\" to %s.\n", conn->address);
1895                                         NetConn_WriteString(mysocket, "\377\377\377\377accept", peeraddress);
1896                                         // now set up the client
1897                                         SV_VM_Begin();
1898                                         SV_ConnectClient(clientnum, conn);
1899                                         SV_VM_End();
1900                                         NetConn_Heartbeat(1);
1901                                         return true;
1902                                 }
1903                         }
1904
1905                         // no empty slots found - server is full
1906                         if (developer.integer >= 10)
1907                                 Con_Printf("Datagram_ParseConnectionless: sending \"reject Server is full.\" to %s.\n", addressstring2);
1908                         NetConn_WriteString(mysocket, "\377\377\377\377reject Server is full.", peeraddress);
1909
1910                         return true;
1911                 }
1912                 if (length >= 7 && !memcmp(string, "getinfo", 7))
1913                 {
1914                         const char *challenge = NULL;
1915
1916                         // If there was a challenge in the getinfo message
1917                         if (length > 8 && string[7] == ' ')
1918                                 challenge = string + 8;
1919
1920                         if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), false))
1921                         {
1922                                 if (developer.integer >= 10)
1923                                         Con_Printf("Sending reply to master %s - %s\n", addressstring2, response);
1924                                 NetConn_WriteString(mysocket, response, peeraddress);
1925                         }
1926                         return true;
1927                 }
1928                 if (length >= 9 && !memcmp(string, "getstatus", 9))
1929                 {
1930                         const char *challenge = NULL;
1931
1932                         // If there was a challenge in the getinfo message
1933                         if (length > 10 && string[9] == ' ')
1934                                 challenge = string + 10;
1935
1936                         if (NetConn_BuildStatusResponse(challenge, response, sizeof(response), true))
1937                         {
1938                                 if (developer.integer >= 10)
1939                                         Con_Printf("Sending reply to client %s - %s\n", addressstring2, response);
1940                                 NetConn_WriteString(mysocket, response, peeraddress);
1941                         }
1942                         return true;
1943                 }
1944                 if (length >= 5 && !memcmp(string, "rcon ", 5))
1945                 {
1946                         int i;
1947                         char *s = string + 5;
1948                         char password[64];
1949                         for (i = 0;*s > ' ';s++)
1950                                 if (i < (int)sizeof(password) - 1)
1951                                         password[i++] = *s;
1952                         password[i] = 0;
1953                         if (password[0] > ' ' && !strcmp(rcon_password.string, password))
1954                         {
1955                                 // looks like a legitimate rcon command with the correct password
1956                                 Con_Printf("server received rcon command from %s:\n%s\n", host_client ? host_client->name : addressstring2, s);
1957                                 rcon_redirect = true;
1958                                 rcon_redirect_bufferpos = 0;
1959                                 Cmd_ExecuteString(s, src_command);
1960                                 rcon_redirect_buffer[rcon_redirect_bufferpos] = 0;
1961                                 rcon_redirect = false;
1962                                 // print resulting text to client
1963                                 // if client is playing, send a reliable reply instead of
1964                                 // a command packet
1965                                 if (host_client)
1966                                 {
1967                                         // if the netconnection is loop, then this is the
1968                                         // local player on a listen mode server, and it would
1969                                         // result in duplicate printing to the console
1970                                         // (not that the local player should be using rcon
1971                                         //  when they have the console)
1972                                         if (host_client->netconnection && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
1973                                                 SV_ClientPrintf("%s", rcon_redirect_buffer);
1974                                 }
1975                                 else
1976                                 {
1977                                         // qw print command
1978                                         dpsnprintf(response, sizeof(response), "\377\377\377\377n%s", rcon_redirect_buffer);
1979                                         NetConn_WriteString(mysocket, response, peeraddress);
1980                                 }
1981                         }
1982                         return true;
1983                 }
1984                 if (!strncmp(string, "ping", 4))
1985                 {
1986                         if (developer.integer >= 10)
1987                                 Con_Printf("Received ping from %s, sending ack\n", addressstring2);
1988                         NetConn_WriteString(mysocket, "\377\377\377\377ack", peeraddress);
1989                         return true;
1990                 }
1991                 if (!strncmp(string, "ack", 3))
1992                         return true;
1993                 // we may not have liked the packet, but it was a command packet, so
1994                 // we're done processing this packet now
1995                 return true;
1996         }
1997         // netquake control packets, supported for compatibility only, and only
1998         // when running game protocols that are normally served via this connection
1999         // protocol
2000         // (this protects more modern protocols against being used for
2001         //  Quake packet flood Denial Of Service attacks)
2002         if (length >= 5 && (i = BigLong(*((int *)data))) && (i & (~NETFLAG_LENGTH_MASK)) == (int)NETFLAG_CTL && (i & NETFLAG_LENGTH_MASK) == length && (sv.protocol == PROTOCOL_QUAKE || sv.protocol == PROTOCOL_QUAKEDP || sv.protocol == PROTOCOL_NEHAHRAMOVIE || sv.protocol == PROTOCOL_DARKPLACES1 || sv.protocol == PROTOCOL_DARKPLACES2 || sv.protocol == PROTOCOL_DARKPLACES3))
2003         {
2004                 int c = data[4];
2005                 data += 5;
2006                 length -= 5;
2007                 switch (c)
2008                 {
2009                 case CCREQ_CONNECT:
2010                         if (developer.integer >= 10)
2011                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_CONNECT from %s.\n", addressstring2);
2012                         if (length < (int)strlen("QUAKE") + 1 + 1)
2013                                 break;
2014
2015                         if (memcmp(data, "QUAKE", strlen("QUAKE") + 1) != 0 || (int)data[strlen("QUAKE") + 1] != NET_PROTOCOL_VERSION)
2016                         {
2017                                 if (developer.integer >= 10)
2018                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Incompatible version.\" to %s.\n", addressstring2);
2019                                 SZ_Clear(&net_message);
2020                                 // save space for the header, filled in later
2021                                 MSG_WriteLong(&net_message, 0);
2022                                 MSG_WriteByte(&net_message, CCREP_REJECT);
2023                                 MSG_WriteString(&net_message, "Incompatible version.\n");
2024                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2025                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2026                                 SZ_Clear(&net_message);
2027                                 break;
2028                         }
2029
2030                         // see if this connect request comes from a known client
2031                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2032                         {
2033                                 if (client->netconnection && LHNETADDRESS_Compare(peeraddress, &client->netconnection->peeraddress) == 0)
2034                                 {
2035                                         // this is either a duplicate connection request
2036                                         // or coming back from a timeout
2037                                         // (if so, keep their stuff intact)
2038
2039                                         // send a reply
2040                                         if (developer.integer >= 10)
2041                                                 Con_Printf("Datagram_ParseConnectionless: sending duplicate CCREP_ACCEPT to %s.\n", addressstring2);
2042                                         SZ_Clear(&net_message);
2043                                         // save space for the header, filled in later
2044                                         MSG_WriteLong(&net_message, 0);
2045                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
2046                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(client->netconnection->mysocket)));
2047                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2048                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2049                                         SZ_Clear(&net_message);
2050
2051                                         // if client is already spawned, re-send the
2052                                         // serverinfo message as they'll need it to play
2053                                         if (client->spawned)
2054                                                 SV_SendServerinfo(client);
2055                                         return true;
2056                                 }
2057                         }
2058
2059                         // this is a new client, check for connection flood
2060                         if (NetConn_PreventConnectFlood(peeraddress))
2061                                 break;
2062
2063                         // find a slot for the new client
2064                         for (clientnum = 0, client = svs.clients;clientnum < svs.maxclients;clientnum++, client++)
2065                         {
2066                                 netconn_t *conn;
2067                                 if (!client->active && (client->netconnection = conn = NetConn_Open(mysocket, peeraddress)) != NULL)
2068                                 {
2069                                         // connect to the client
2070                                         // everything is allocated, just fill in the details
2071                                         strlcpy (conn->address, addressstring2, sizeof (conn->address));
2072                                         if (developer.integer >= 10)
2073                                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_ACCEPT to %s.\n", addressstring2);
2074                                         // send back the info about the server connection
2075                                         SZ_Clear(&net_message);
2076                                         // save space for the header, filled in later
2077                                         MSG_WriteLong(&net_message, 0);
2078                                         MSG_WriteByte(&net_message, CCREP_ACCEPT);
2079                                         MSG_WriteLong(&net_message, LHNETADDRESS_GetPort(LHNET_AddressFromSocket(conn->mysocket)));
2080                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2081                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2082                                         SZ_Clear(&net_message);
2083                                         // now set up the client struct
2084                                         SV_VM_Begin();
2085                                         SV_ConnectClient(clientnum, conn);
2086                                         SV_VM_End();
2087                                         NetConn_Heartbeat(1);
2088                                         return true;
2089                                 }
2090                         }
2091
2092                         if (developer.integer >= 10)
2093                                 Con_Printf("Datagram_ParseConnectionless: sending CCREP_REJECT \"Server is full.\" to %s.\n", addressstring2);
2094                         // no room; try to let player know
2095                         SZ_Clear(&net_message);
2096                         // save space for the header, filled in later
2097                         MSG_WriteLong(&net_message, 0);
2098                         MSG_WriteByte(&net_message, CCREP_REJECT);
2099                         MSG_WriteString(&net_message, "Server is full.\n");
2100                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2101                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2102                         SZ_Clear(&net_message);
2103                         break;
2104                 case CCREQ_SERVER_INFO:
2105                         if (developer.integer >= 10)
2106                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_SERVER_INFO from %s.\n", addressstring2);
2107                         if (sv.active && !strcmp(MSG_ReadString(), "QUAKE"))
2108                         {
2109                                 int numclients;
2110                                 char myaddressstring[128];
2111                                 if (developer.integer >= 10)
2112                                         Con_Printf("Datagram_ParseConnectionless: sending CCREP_SERVER_INFO to %s.\n", addressstring2);
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_SERVER_INFO);
2117                                 LHNETADDRESS_ToString(LHNET_AddressFromSocket(mysocket), myaddressstring, sizeof(myaddressstring), true);
2118                                 MSG_WriteString(&net_message, myaddressstring);
2119                                 MSG_WriteString(&net_message, hostname.string);
2120                                 MSG_WriteString(&net_message, sv.name);
2121                                 // How many clients are there?
2122                                 for (i = 0, numclients = 0;i < svs.maxclients;i++)
2123                                         if (svs.clients[i].active)
2124                                                 numclients++;
2125                                 MSG_WriteByte(&net_message, numclients);
2126                                 MSG_WriteByte(&net_message, svs.maxclients);
2127                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
2128                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2129                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2130                                 SZ_Clear(&net_message);
2131                         }
2132                         break;
2133                 case CCREQ_PLAYER_INFO:
2134                         if (developer.integer >= 10)
2135                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_PLAYER_INFO from %s.\n", addressstring2);
2136                         if (sv.active)
2137                         {
2138                                 int playerNumber, activeNumber, clientNumber;
2139                                 client_t *client;
2140
2141                                 playerNumber = MSG_ReadByte();
2142                                 activeNumber = -1;
2143                                 for (clientNumber = 0, client = svs.clients; clientNumber < svs.maxclients; clientNumber++, client++)
2144                                         if (client->active && ++activeNumber == playerNumber)
2145                                                 break;
2146                                 if (clientNumber != svs.maxclients)
2147                                 {
2148                                         SZ_Clear(&net_message);
2149                                         // save space for the header, filled in later
2150                                         MSG_WriteLong(&net_message, 0);
2151                                         MSG_WriteByte(&net_message, CCREP_PLAYER_INFO);
2152                                         MSG_WriteByte(&net_message, playerNumber);
2153                                         MSG_WriteString(&net_message, client->name);
2154                                         MSG_WriteLong(&net_message, client->colors);
2155                                         MSG_WriteLong(&net_message, (int)client->edict->fields.server->frags);
2156                                         MSG_WriteLong(&net_message, (int)(realtime - client->connecttime));
2157                                         MSG_WriteString(&net_message, client->netconnection ? client->netconnection->address : "botclient");
2158                                         *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2159                                         NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2160                                         SZ_Clear(&net_message);
2161                                 }
2162                         }
2163                         break;
2164                 case CCREQ_RULE_INFO:
2165                         if (developer.integer >= 10)
2166                                 Con_Printf("Datagram_ParseConnectionless: received CCREQ_RULE_INFO from %s.\n", addressstring2);
2167                         if (sv.active)
2168                         {
2169                                 char *prevCvarName;
2170                                 cvar_t *var;
2171
2172                                 // find the search start location
2173                                 prevCvarName = MSG_ReadString();
2174                                 var = Cvar_FindVarAfter(prevCvarName, CVAR_NOTIFY);
2175
2176                                 // send the response
2177                                 SZ_Clear(&net_message);
2178                                 // save space for the header, filled in later
2179                                 MSG_WriteLong(&net_message, 0);
2180                                 MSG_WriteByte(&net_message, CCREP_RULE_INFO);
2181                                 if (var)
2182                                 {
2183                                         MSG_WriteString(&net_message, var->name);
2184                                         MSG_WriteString(&net_message, var->string);
2185                                 }
2186                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2187                                 NetConn_Write(mysocket, net_message.data, net_message.cursize, peeraddress);
2188                                 SZ_Clear(&net_message);
2189                         }
2190                         break;
2191                 default:
2192                         break;
2193                 }
2194                 // we may not have liked the packet, but it was a valid control
2195                 // packet, so we're done processing this packet now
2196                 return true;
2197         }
2198         if (host_client)
2199         {
2200                 if ((ret = NetConn_ReceivedMessage(host_client->netconnection, data, length, sv.protocol, host_client->spawned ? net_messagetimeout.value : net_connecttimeout.value)) == 2)
2201                 {
2202                         SV_VM_Begin();
2203                         SV_ReadClientMessage();
2204                         SV_VM_End();
2205                         return ret;
2206                 }
2207         }
2208         return 0;
2209 }
2210
2211 void NetConn_ServerFrame(void)
2212 {
2213         int i, length;
2214         lhnetaddress_t peeraddress;
2215         for (i = 0;i < sv_numsockets;i++)
2216                 while (sv_sockets[i] && (length = NetConn_Read(sv_sockets[i], readbuffer, sizeof(readbuffer), &peeraddress)) > 0)
2217                         NetConn_ServerParsePacket(sv_sockets[i], readbuffer, length, &peeraddress);
2218         for (i = 0, host_client = svs.clients;i < svs.maxclients;i++, host_client++)
2219         {
2220                 // never timeout loopback connections
2221                 if (host_client->netconnection && realtime > host_client->netconnection->timeout && LHNETADDRESS_GetAddressType(&host_client->netconnection->peeraddress) != LHNETADDRESSTYPE_LOOP)
2222                 {
2223                         Con_Printf("Client \"%s\" connection timed out\n", host_client->name);
2224                         SV_VM_Begin();
2225                         SV_DropClient(false);
2226                         SV_VM_End();
2227                 }
2228         }
2229 }
2230
2231 void NetConn_QueryMasters(qboolean querydp, qboolean queryqw)
2232 {
2233         int i;
2234         int masternum;
2235         lhnetaddress_t masteraddress;
2236         lhnetaddress_t broadcastaddress;
2237         char request[256];
2238
2239         if (serverlist_cachecount >= SERVERLIST_TOTALSIZE)
2240                 return;
2241
2242         // 26000 is the default quake server port, servers on other ports will not
2243         // be found
2244         // note this is IPv4-only, I doubt there are IPv6-only LANs out there
2245         LHNETADDRESS_FromString(&broadcastaddress, "255.255.255.255", 26000);
2246
2247         if (querydp)
2248         {
2249                 for (i = 0;i < cl_numsockets;i++)
2250                 {
2251                         if (cl_sockets[i])
2252                         {
2253                                 // search LAN for Quake servers
2254                                 SZ_Clear(&net_message);
2255                                 // save space for the header, filled in later
2256                                 MSG_WriteLong(&net_message, 0);
2257                                 MSG_WriteByte(&net_message, CCREQ_SERVER_INFO);
2258                                 MSG_WriteString(&net_message, "QUAKE");
2259                                 MSG_WriteByte(&net_message, NET_PROTOCOL_VERSION);
2260                                 *((int *)net_message.data) = BigLong(NETFLAG_CTL | (net_message.cursize & NETFLAG_LENGTH_MASK));
2261                                 NetConn_Write(cl_sockets[i], net_message.data, net_message.cursize, &broadcastaddress);
2262                                 SZ_Clear(&net_message);
2263
2264                                 // search LAN for DarkPlaces servers
2265                                 NetConn_WriteString(cl_sockets[i], "\377\377\377\377getinfo", &broadcastaddress);
2266
2267                                 // build the getservers message to send to the dpmaster master servers
2268                                 dpsnprintf(request, sizeof(request), "\377\377\377\377getservers %s %u empty full\x0A", gamename, NET_PROTOCOL_VERSION);
2269
2270                                 // search internet
2271                                 for (masternum = 0;sv_masters[masternum].name;masternum++)
2272                                 {
2273                                         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])))
2274                                         {
2275                                                 masterquerycount++;
2276                                                 NetConn_WriteString(cl_sockets[i], request, &masteraddress);
2277                                         }
2278                                 }
2279                         }
2280                 }
2281         }
2282
2283         // only query QuakeWorld servers when the user wants to
2284         if (queryqw)
2285         {
2286                 for (i = 0;i < cl_numsockets;i++)
2287                 {
2288                         if (cl_sockets[i])
2289                         {
2290                                 // search LAN for QuakeWorld servers
2291                                 NetConn_WriteString(cl_sockets[i], "\377\377\377\377status\n", &broadcastaddress);
2292
2293                                 // build the getservers message to send to the qwmaster master servers
2294                                 // note this has no -1 prefix, and the trailing nul byte is sent
2295                                 dpsnprintf(request, sizeof(request), "c\n");
2296
2297                                 // search internet
2298                                 for (masternum = 0;sv_qwmasters[masternum].name;masternum++)
2299                                 {
2300                                         if (sv_qwmasters[masternum].string && LHNETADDRESS_FromString(&masteraddress, sv_qwmasters[masternum].string, QWMASTER_PORT) && LHNETADDRESS_GetAddressType(&masteraddress) == LHNETADDRESS_GetAddressType(LHNET_AddressFromSocket(cl_sockets[i])))
2301                                         {
2302                                                 if (m_state != m_slist)
2303                                                 {
2304                                                         char lookupstring[128];
2305                                                         LHNETADDRESS_ToString(&masteraddress, lookupstring, sizeof(lookupstring), true);
2306                                                         Con_Printf("Querying master %s (resolved from %s)\n", lookupstring, sv_qwmasters[masternum].string);
2307                                                 }
2308                                                 masterquerycount++;
2309                                                 NetConn_Write(cl_sockets[i], request, (int)strlen(request) + 1, &masteraddress);
2310                                         }
2311                                 }
2312                         }
2313                 }
2314         }
2315         if (!masterquerycount)
2316         {
2317                 Con_Print("Unable to query master servers, no suitable network sockets active.\n");
2318                 M_Update_Return_Reason("No network");
2319         }
2320 }
2321
2322 void NetConn_Heartbeat(int priority)
2323 {
2324         lhnetaddress_t masteraddress;
2325         int masternum;
2326         lhnetsocket_t *mysocket;
2327
2328         // if it's a state change (client connected), limit next heartbeat to no
2329         // more than 30 sec in the future
2330         if (priority == 1 && nextheartbeattime > realtime + 30.0)
2331                 nextheartbeattime = realtime + 30.0;
2332
2333         // limit heartbeatperiod to 30 to 270 second range,
2334         // lower limit is to avoid abusing master servers with excess traffic,
2335         // upper limit is to avoid timing out on the master server (which uses
2336         // 300 sec timeout)
2337         if (sv_heartbeatperiod.value < 30)
2338                 Cvar_SetValueQuick(&sv_heartbeatperiod, 30);
2339         if (sv_heartbeatperiod.value > 270)
2340                 Cvar_SetValueQuick(&sv_heartbeatperiod, 270);
2341
2342         // make advertising optional and don't advertise singleplayer games, and
2343         // only send a heartbeat as often as the admin wants
2344         if (sv.active && sv_public.integer && svs.maxclients >= 2 && (priority > 1 || realtime > nextheartbeattime))
2345         {
2346                 nextheartbeattime = realtime + sv_heartbeatperiod.value;
2347                 for (masternum = 0;sv_masters[masternum].name;masternum++)
2348                         if (sv_masters[masternum].string && sv_masters[masternum].string[0] && LHNETADDRESS_FromString(&masteraddress, sv_masters[masternum].string, DPMASTER_PORT) && (mysocket = NetConn_ChooseServerSocketForAddress(&masteraddress)))
2349                                 NetConn_WriteString(mysocket, "\377\377\377\377heartbeat DarkPlaces\x0A", &masteraddress);
2350         }
2351 }
2352
2353 static void Net_Heartbeat_f(void)
2354 {
2355         if (sv.active)
2356                 NetConn_Heartbeat(2);
2357         else
2358                 Con_Print("No server running, can not heartbeat to master server.\n");
2359 }
2360
2361 void PrintStats(netconn_t *conn)
2362 {
2363         if ((cls.state == ca_connected && cls.protocol == PROTOCOL_QUAKEWORLD) || (sv.active && sv.protocol == PROTOCOL_QUAKEWORLD))
2364                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->qw.outgoing_sequence, conn->qw.incoming_sequence);
2365         else
2366                 Con_Printf("address=%21s canSend=%u sendSeq=%6u recvSeq=%6u\n", conn->address, !conn->sendMessageLength, conn->nq.sendSequence, conn->nq.receiveSequence);
2367 }
2368
2369 void Net_Stats_f(void)
2370 {
2371         netconn_t *conn;
2372         Con_Printf("unreliable messages sent   = %i\n", unreliableMessagesSent);
2373         Con_Printf("unreliable messages recv   = %i\n", unreliableMessagesReceived);
2374         Con_Printf("reliable messages sent     = %i\n", reliableMessagesSent);
2375         Con_Printf("reliable messages received = %i\n", reliableMessagesReceived);
2376         Con_Printf("packetsSent                = %i\n", packetsSent);
2377         Con_Printf("packetsReSent              = %i\n", packetsReSent);
2378         Con_Printf("packetsReceived            = %i\n", packetsReceived);
2379         Con_Printf("receivedDuplicateCount     = %i\n", receivedDuplicateCount);
2380         Con_Printf("droppedDatagrams           = %i\n", droppedDatagrams);
2381         Con_Print("connections                =\n");
2382         for (conn = netconn_list;conn;conn = conn->next)
2383                 PrintStats(conn);
2384 }
2385
2386 void Net_Slist_f(void)
2387 {
2388         ServerList_ResetMasks();
2389         serverlist_sortbyfield = SLIF_PING;
2390         serverlist_sortdescending = false;
2391     if (m_state != m_slist) {
2392                 Con_Print("Sending requests to master servers\n");
2393                 ServerList_QueryList(true, false);
2394                 serverlist_consoleoutput = true;
2395                 Con_Print("Listening for replies...\n");
2396         } else
2397                 ServerList_QueryList(true, false);
2398 }
2399
2400 void Net_SlistQW_f(void)
2401 {
2402         ServerList_ResetMasks();
2403         serverlist_sortbyfield = SLIF_PING;
2404         serverlist_sortdescending = false;
2405     if (m_state != m_slist) {
2406                 Con_Print("Sending requests to master servers\n");
2407                 ServerList_QueryList(false, true);
2408                 serverlist_consoleoutput = true;
2409                 Con_Print("Listening for replies...\n");
2410         } else
2411                 ServerList_QueryList(false, true);
2412 }
2413
2414 void NetConn_Init(void)
2415 {
2416         int i;
2417         lhnetaddress_t tempaddress;
2418         netconn_mempool = Mem_AllocPool("network connections", 0, NULL);
2419         Cmd_AddCommand("net_stats", Net_Stats_f, "print network statistics");
2420         Cmd_AddCommand("net_slist", Net_Slist_f, "query dp master servers and print all server information");
2421         Cmd_AddCommand("net_slistqw", Net_SlistQW_f, "query qw master servers and print all server information");
2422         Cmd_AddCommand("heartbeat", Net_Heartbeat_f, "send a heartbeat to the master server (updates your server information)");
2423         Cvar_RegisterVariable(&net_slist_queriespersecond);
2424         Cvar_RegisterVariable(&net_slist_queriesperframe);
2425         Cvar_RegisterVariable(&net_slist_timeout);
2426         Cvar_RegisterVariable(&net_slist_maxtries);
2427         Cvar_RegisterVariable(&net_messagetimeout);
2428         Cvar_RegisterVariable(&net_connecttimeout);
2429         Cvar_RegisterVariable(&net_connectfloodblockingtimeout);
2430         Cvar_RegisterVariable(&cl_netlocalping);
2431         Cvar_RegisterVariable(&cl_netpacketloss);
2432         Cvar_RegisterVariable(&hostname);
2433         Cvar_RegisterVariable(&developer_networking);
2434         Cvar_RegisterVariable(&cl_netport);
2435         Cvar_RegisterVariable(&sv_netport);
2436         Cvar_RegisterVariable(&net_address);
2437         //Cvar_RegisterVariable(&net_address_ipv6);
2438         Cvar_RegisterVariable(&sv_public);
2439         Cvar_RegisterVariable(&sv_heartbeatperiod);
2440         for (i = 0;sv_masters[i].name;i++)
2441                 Cvar_RegisterVariable(&sv_masters[i]);
2442         Cvar_RegisterVariable(&gameversion);
2443 // 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.
2444         if ((i = COM_CheckParm("-ip")) && i + 1 < com_argc)
2445         {
2446                 if (LHNETADDRESS_FromString(&tempaddress, com_argv[i + 1], 0) == 1)
2447                 {
2448                         Con_Printf("-ip option used, setting net_address to \"%s\"\n");
2449                         Cvar_SetQuick(&net_address, com_argv[i + 1]);
2450                 }
2451                 else
2452                         Con_Printf("-ip option used, but unable to parse the address \"%s\"\n", com_argv[i + 1]);
2453         }
2454 // 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
2455         if (((i = COM_CheckParm("-port")) || (i = COM_CheckParm("-ipport")) || (i = COM_CheckParm("-udpport"))) && i + 1 < com_argc)
2456         {
2457                 i = atoi(com_argv[i + 1]);
2458                 if (i >= 0 && i < 65536)
2459                 {
2460                         Con_Printf("-port option used, setting port cvar to %i\n", i);
2461                         Cvar_SetValueQuick(&sv_netport, i);
2462                 }
2463                 else
2464                         Con_Printf("-port option used, but %i is not a valid port number\n", i);
2465         }
2466         cl_numsockets = 0;
2467         sv_numsockets = 0;
2468         net_message.data = net_message_buf;
2469         net_message.maxsize = sizeof(net_message_buf);
2470         net_message.cursize = 0;
2471         LHNET_Init();
2472 }
2473
2474 void NetConn_Shutdown(void)
2475 {
2476         NetConn_CloseClientPorts();
2477         NetConn_CloseServerPorts();
2478         LHNET_Shutdown();
2479 }
2480