ref: bea7b7bf8ccbc2bc41906517079e76fcfb31cb5a
dir: /code/server/sv_main.c/
/*
===========================================================================
Copyright (C) 1999-2005 Id Software, Inc.
This file is part of Quake III Arena source code.
Quake III Arena source code is free software; you can redistribute it
and/or modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
Quake III Arena source code is distributed in the hope that it will be
useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Foobar; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
===========================================================================
*/
#include "server.h"
serverStatic_t svs; // persistant server info
server_t sv; // local server
vm_t *gvm = NULL; // game virtual machine // bk001212 init
cvar_t *sv_fps; // time rate for running non-clients
cvar_t *sv_timeout; // seconds without any message
cvar_t *sv_zombietime; // seconds to sink messages after disconnect
cvar_t *sv_rconPassword; // password for remote server commands
cvar_t *sv_privatePassword; // password for the privateClient slots
cvar_t *sv_allowDownload;
cvar_t *sv_maxclients;
cvar_t *sv_privateClients; // number of clients reserved for password
cvar_t *sv_hostname;
cvar_t *sv_master[MAX_MASTER_SERVERS]; // master server ip address
cvar_t *sv_reconnectlimit; // minimum seconds between connect messages
cvar_t *sv_showloss; // report when usercmds are lost
cvar_t *sv_padPackets; // add nop bytes to messages
cvar_t *sv_killserver; // menu system can set to 1 to shut server down
cvar_t *sv_mapname;
cvar_t *sv_mapChecksum;
cvar_t *sv_serverid;
cvar_t *sv_maxRate;
cvar_t *sv_minPing;
cvar_t *sv_maxPing;
cvar_t *sv_gametype;
cvar_t *sv_pure;
cvar_t *sv_floodProtect;
cvar_t *sv_lanForceRate; // dedicated 1 (LAN) server forces local client rates to 99999 (bug #491)
cvar_t *sv_strictAuth;
/*
=============================================================================
EVENT MESSAGES
=============================================================================
*/
/*
===============
SV_ExpandNewlines
Converts newlines to "\n" so a line prints nicer
===============
*/
char *SV_ExpandNewlines( char *in ) {
static char string[1024];
int l;
l = 0;
while ( *in && l < sizeof(string) - 3 ) {
if ( *in == '\n' ) {
string[l++] = '\\';
string[l++] = 'n';
} else {
string[l++] = *in;
}
in++;
}
string[l] = 0;
return string;
}
/*
======================
SV_ReplacePendingServerCommands
This is ugly
======================
*/
int SV_ReplacePendingServerCommands( client_t *client, const char *cmd ) {
int i, index, csnum1, csnum2;
for ( i = client->reliableSent+1; i <= client->reliableSequence; i++ ) {
index = i & ( MAX_RELIABLE_COMMANDS - 1 );
//
if ( !Q_strncmp(cmd, client->reliableCommands[ index ], strlen("cs")) ) {
sscanf(cmd, "cs %i", &csnum1);
sscanf(client->reliableCommands[ index ], "cs %i", &csnum2);
if ( csnum1 == csnum2 ) {
Q_strncpyz( client->reliableCommands[ index ], cmd, sizeof( client->reliableCommands[ index ] ) );
/*
if ( client->netchan.remoteAddress.type != NA_BOT ) {
Com_Printf( "WARNING: client %i removed double pending config string %i: %s\n", client-svs.clients, csnum1, cmd );
}
*/
return qtrue;
}
}
}
return qfalse;
}
/*
======================
SV_AddServerCommand
The given command will be transmitted to the client, and is guaranteed to
not have future snapshot_t executed before it is executed
======================
*/
void SV_AddServerCommand( client_t *client, const char *cmd ) {
int index, i;
// this is very ugly but it's also a waste to for instance send multiple config string updates
// for the same config string index in one snapshot
// if ( SV_ReplacePendingServerCommands( client, cmd ) ) {
// return;
// }
client->reliableSequence++;
// if we would be losing an old command that hasn't been acknowledged,
// we must drop the connection
// we check == instead of >= so a broadcast print added by SV_DropClient()
// doesn't cause a recursive drop client
if ( client->reliableSequence - client->reliableAcknowledge == MAX_RELIABLE_COMMANDS + 1 ) {
Com_Printf( "===== pending server commands =====\n" );
for ( i = client->reliableAcknowledge + 1 ; i <= client->reliableSequence ; i++ ) {
Com_Printf( "cmd %5d: %s\n", i, client->reliableCommands[ i & (MAX_RELIABLE_COMMANDS-1) ] );
}
Com_Printf( "cmd %5d: %s\n", i, cmd );
SV_DropClient( client, "Server command overflow" );
return;
}
index = client->reliableSequence & ( MAX_RELIABLE_COMMANDS - 1 );
Q_strncpyz( client->reliableCommands[ index ], cmd, sizeof( client->reliableCommands[ index ] ) );
}
/*
=================
SV_SendServerCommand
Sends a reliable command string to be interpreted by
the client game module: "cp", "print", "chat", etc
A NULL client will broadcast to all clients
=================
*/
void QDECL SV_SendServerCommand(client_t *cl, const char *fmt, ...) {
va_list argptr;
byte message[MAX_MSGLEN];
client_t *client;
int j;
va_start (argptr,fmt);
Q_vsnprintf ((char *)message, sizeof(message), fmt,argptr);
va_end (argptr);
if ( cl != NULL ) {
SV_AddServerCommand( cl, (char *)message );
return;
}
// hack to echo broadcast prints to console
if ( com_dedicated->integer && !strncmp( (char *)message, "print", 5) ) {
Com_Printf ("broadcast: %s\n", SV_ExpandNewlines((char *)message) );
}
// send the data to all relevent clients
for (j = 0, client = svs.clients; j < sv_maxclients->integer ; j++, client++) {
if ( client->state < CS_PRIMED ) {
continue;
}
SV_AddServerCommand( client, (char *)message );
}
}
/*
==============================================================================
MASTER SERVER FUNCTIONS
==============================================================================
*/
/*
================
SV_MasterHeartbeat
Send a message to the masters every few minutes to
let it know we are alive, and log information.
We will also have a heartbeat sent when a server
changes from empty to non-empty, and full to non-full,
but not on every player enter or exit.
================
*/
#define HEARTBEAT_MSEC 300*1000
#define HEARTBEAT_GAME "QuakeArena-1"
void SV_MasterHeartbeat( void ) {
static netadr_t adr[MAX_MASTER_SERVERS];
int i;
// "dedicated 1" is for lan play, "dedicated 2" is for inet public play
if ( !com_dedicated || com_dedicated->integer != 2 ) {
return; // only dedicated servers send heartbeats
}
// if not time yet, don't send anything
if ( svs.time < svs.nextHeartbeatTime ) {
return;
}
svs.nextHeartbeatTime = svs.time + HEARTBEAT_MSEC;
// send to group masters
for ( i = 0 ; i < MAX_MASTER_SERVERS ; i++ ) {
if ( !sv_master[i]->string[0] ) {
continue;
}
// see if we haven't already resolved the name
// resolving usually causes hitches on win95, so only
// do it when needed
if ( sv_master[i]->modified ) {
char s[128], *p;
sv_master[i]->modified = qfalse;
p = sv_master[i]->string;
if(strrchr(p, ':') == nil && strrchr(p, '!') == nil){
p = s;
snprint(s, sizeof s, "%s!%d", sv_master[i]->string, PORT_MASTER);
}
Com_Printf("Resolving %s\n", p);
if(!NET_StringToAdr(p, &adr[i])){
// if the address failed to resolve, clear it
// so we don't take repeated dns hits
Com_Printf("Couldn't resolve address: %s\n", sv_master[i]->string);
Cvar_Set(sv_master[i]->name, "");
sv_master[i]->modified = qfalse;
continue;
}
Com_Printf("Resolved to %s\n", adr[i].sys);
}
Com_Printf ("Sending heartbeat to %s\n", sv_master[i]->string );
// this command should be changed if the server info / status format
// ever incompatably changes
NET_OutOfBandPrint( NS_SERVER, &adr[i], "heartbeat %s\n", HEARTBEAT_GAME );
}
}
/*
=================
SV_MasterShutdown
Informs all masters that this server is going down
=================
*/
void SV_MasterShutdown( void ) {
// send a hearbeat right now
svs.nextHeartbeatTime = -9999;
SV_MasterHeartbeat();
// send it again to minimize chance of drops
svs.nextHeartbeatTime = -9999;
SV_MasterHeartbeat();
// when the master tries to poll the server, it won't respond, so
// it will be removed from the list
}
/*
==============================================================================
CONNECTIONLESS COMMANDS
==============================================================================
*/
/*
================
SVC_Status
Responds with all the info that qplug or qspy can see about the server
and all connected players. Used for getting detailed information after
the simple info query.
================
*/
void SVC_Status( netadr_t from ) {
char player[1024];
char status[MAX_MSGLEN];
int i;
client_t *cl;
playerState_t *ps;
int statusLength;
int playerLength;
char infostring[MAX_INFO_STRING];
// ignore if we are in single player
if ( Cvar_VariableValue( "g_gametype" ) == GT_SINGLE_PLAYER ) {
return;
}
strcpy( infostring, Cvar_InfoString( CVAR_SERVERINFO ) );
// echo back the parameter to status. so master servers can use it as a challenge
// to prevent timed spoofed reply packets that add ghost servers
Info_SetValueForKey( infostring, "challenge", Cmd_Argv(1) );
// add "demo" to the sv_keywords if restricted
if ( Cvar_VariableValue( "fs_restrict" ) ) {
char keywords[MAX_INFO_STRING];
Com_sprintf( keywords, sizeof( keywords ), "demo %s",
Info_ValueForKey( infostring, "sv_keywords" ) );
Info_SetValueForKey( infostring, "sv_keywords", keywords );
}
status[0] = 0;
statusLength = 0;
for (i=0 ; i < sv_maxclients->integer ; i++) {
cl = &svs.clients[i];
if ( cl->state >= CS_CONNECTED ) {
ps = SV_GameClientNum( i );
Com_sprintf (player, sizeof(player), "%i %i \"%s\"\n",
ps->persistant[PERS_SCORE], cl->ping, cl->name);
playerLength = strlen(player);
if (statusLength + playerLength >= sizeof(status) ) {
break; // can't hold any more
}
strcpy (status + statusLength, player);
statusLength += playerLength;
}
}
NET_OutOfBandPrint( NS_SERVER, &from, "statusResponse\n%s\n%s", infostring, status );
}
/*
================
SVC_Info
Responds with a short info message that should be enough to determine
if a user is interested in a server to do a full status
================
*/
void SVC_Info( netadr_t from ) {
int i, count;
char *gamedir;
char infostring[MAX_INFO_STRING];
// ignore if we are in single player
if ( Cvar_VariableValue( "g_gametype" ) == GT_SINGLE_PLAYER || Cvar_VariableValue("ui_singlePlayerActive")) {
return;
}
// don't count privateclients
count = 0;
for ( i = sv_privateClients->integer ; i < sv_maxclients->integer ; i++ ) {
if ( svs.clients[i].state >= CS_CONNECTED ) {
count++;
}
}
infostring[0] = 0;
// echo back the parameter to status. so servers can use it as a challenge
// to prevent timed spoofed reply packets that add ghost servers
Info_SetValueForKey( infostring, "challenge", Cmd_Argv(1) );
Info_SetValueForKey( infostring, "protocol", va("%i", PROTOCOL_VERSION) );
Info_SetValueForKey( infostring, "hostname", sv_hostname->string );
Info_SetValueForKey( infostring, "mapname", sv_mapname->string );
Info_SetValueForKey( infostring, "clients", va("%i", count) );
Info_SetValueForKey( infostring, "sv_maxclients",
va("%i", sv_maxclients->integer - sv_privateClients->integer ) );
Info_SetValueForKey( infostring, "gametype", va("%i", sv_gametype->integer ) );
Info_SetValueForKey( infostring, "pure", va("%i", sv_pure->integer ) );
if( sv_minPing->integer ) {
Info_SetValueForKey( infostring, "minPing", va("%i", sv_minPing->integer) );
}
if( sv_maxPing->integer ) {
Info_SetValueForKey( infostring, "maxPing", va("%i", sv_maxPing->integer) );
}
gamedir = Cvar_VariableString( "fs_game" );
if( *gamedir ) {
Info_SetValueForKey( infostring, "game", gamedir );
}
NET_OutOfBandPrint( NS_SERVER, &from, "infoResponse\n%s", infostring );
}
/*
================
SVC_FlushRedirect
================
*/
void SV_FlushRedirect( char *outputbuf ) {
NET_OutOfBandPrint( NS_SERVER, &svs.redirectAddress, "print\n%s", outputbuf );
}
/*
===============
SVC_RemoteCommand
An rcon packet arrived from the network.
Shift down the remaining args
Redirect all printfs
===============
*/
void SVC_RemoteCommand( netadr_t from, msg_t *msg ) {
qboolean valid;
unsigned int time;
char remaining[1024];
// TTimo - scaled down to accumulate, but not overflow anything network wise, print wise etc.
// (OOB messages are the bottleneck here)
#define SV_OUTPUTBUF_LENGTH (1024 - 16)
char sv_outputbuf[SV_OUTPUTBUF_LENGTH];
static unsigned int lasttime = 0;
char *cmd_aux;
// TTimo - https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=534
time = Com_Milliseconds();
if (time<(lasttime+500)) {
return;
}
lasttime = time;
if ( !strlen( sv_rconPassword->string ) ||
strcmp (Cmd_Argv(1), sv_rconPassword->string) ) {
valid = qfalse;
Com_Printf("Bad rcon from %s:\n%s\n", from.sys, Cmd_Argv(2));
} else {
valid = qtrue;
Com_Printf("Rcon from %s:\n%s\n", from.sys, Cmd_Argv(2));
}
// start redirecting all print outputs to the packet
svs.redirectAddress = from;
Com_BeginRedirect (sv_outputbuf, SV_OUTPUTBUF_LENGTH, SV_FlushRedirect);
if ( !strlen( sv_rconPassword->string ) ) {
Com_Printf ("No rconpassword set on the server.\n");
} else if ( !valid ) {
Com_Printf ("Bad rconpassword.\n");
} else {
remaining[0] = 0;
// https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=543
// get the command directly, "rcon <pass> <command>" to avoid quoting issues
// extract the command by walking
// since the cmd formatting can fuckup (amount of spaces), using a dumb step by step parsing
cmd_aux = Cmd_Cmd();
cmd_aux+=4;
while(cmd_aux[0]==' ')
cmd_aux++;
while(cmd_aux[0] && cmd_aux[0]!=' ') // password
cmd_aux++;
while(cmd_aux[0]==' ')
cmd_aux++;
Q_strcat( remaining, sizeof(remaining), cmd_aux);
Cmd_ExecuteString (remaining);
}
Com_EndRedirect ();
}
/*
=================
SV_ConnectionlessPacket
A connectionless packet has four leading 0xff
characters to distinguish it from a game channel.
Clients that are in the game can still send
connectionless packets.
=================
*/
void SV_ConnectionlessPacket( netadr_t from, msg_t *msg ) {
char *s;
char *c;
MSG_BeginReadingOOB( msg );
MSG_ReadLong( msg ); // skip the -1 marker
if (!Q_strncmp("connect", (char*)&msg->data[4], 7)) {
Huff_Decompress(msg, 12);
}
s = MSG_ReadStringLine( msg );
Cmd_TokenizeString( s );
c = Cmd_Argv(0);
Com_DPrintf("SV packet %s : %s\n", from.sys, c);
if (!Q_stricmp(c, "getstatus")) {
SVC_Status( from );
} else if (!Q_stricmp(c, "getinfo")) {
SVC_Info( from );
} else if (!Q_stricmp(c, "getchallenge")) {
SV_GetChallenge( from );
} else if (!Q_stricmp(c, "connect")) {
SV_DirectConnect( from );
} else if (!Q_stricmp(c, "ipAuthorize")) {
SV_AuthorizeIpPacket( from );
} else if (!Q_stricmp(c, "rcon")) {
SVC_RemoteCommand( from, msg );
} else if (!Q_stricmp(c, "disconnect")) {
// if a client starts up a local server, we may see some spurious
// server disconnect messages when their new server sees our final
// sequenced messages to the old client
} else {
Com_DPrintf ("bad connectionless packet from %s:\n%s\n"
, from.sys, s);
}
}
//============================================================================
/*
=================
SV_ReadPackets
=================
*/
void SV_PacketEvent( netadr_t from, msg_t *msg ) {
int i;
client_t *cl;
int qport;
// check for connectionless packet (0xffffffff) first
if ( msg->cursize >= 4 && *(int *)msg->data == -1) {
SV_ConnectionlessPacket( from, msg );
return;
}
// read the qport out of the message so we can fix up
// stupid address translating routers
MSG_BeginReadingOOB( msg );
MSG_ReadLong( msg ); // sequence number
qport = MSG_ReadShort( msg ) & 0xffff;
// find which client the message is from
for (i=0, cl=svs.clients ; i < sv_maxclients->integer ; i++,cl++) {
if (cl->state == CS_FREE) {
continue;
}
if(!NET_CompareBaseAdr(&from, &cl->netchan.remoteAddress))
continue;
// it is possible to have multiple clients from a single IP
// address, so they are differentiated by the qport variable
if (cl->netchan.qport != qport) {
continue;
}
// the IP port can't be used to differentiate them, because
// some address translating routers periodically change UDP
// port assignments
if(strcmp(cl->netchan.remoteAddress.srv, from.srv) != 0){
Com_Printf( "SV_PacketEvent: fixing up a translated port\n" );
memcpy(&cl->netchan.remoteAddress, &from, sizeof from);
}
// make sure it is a valid, in sequence packet
if (SV_Netchan_Process(cl, msg)) {
// zombie clients still need to do the Netchan_Process
// to make sure they don't need to retransmit the final
// reliable message, but they don't do any other processing
if (cl->state != CS_ZOMBIE) {
cl->lastPacketTime = svs.time; // don't timeout
SV_ExecuteClientMessage( cl, msg );
}
}
return;
}
// if we received a sequenced packet from an address we don't recognize,
// send an out of band disconnect packet to it
NET_OutOfBandPrint( NS_SERVER, &from, "disconnect" );
}
/*
===================
SV_CalcPings
Updates the cl->ping variables
===================
*/
void SV_CalcPings( void ) {
int i, j;
client_t *cl;
int total, count;
int delta;
playerState_t *ps;
for (i=0 ; i < sv_maxclients->integer ; i++) {
cl = &svs.clients[i];
if ( cl->state != CS_ACTIVE ) {
cl->ping = 999;
continue;
}
if ( !cl->gentity ) {
cl->ping = 999;
continue;
}
if ( cl->gentity->r.svFlags & SVF_BOT ) {
cl->ping = 0;
continue;
}
total = 0;
count = 0;
for ( j = 0 ; j < PACKET_BACKUP ; j++ ) {
if ( cl->frames[j].messageAcked <= 0 ) {
continue;
}
delta = cl->frames[j].messageAcked - cl->frames[j].messageSent;
count++;
total += delta;
}
if (!count) {
cl->ping = 999;
} else {
cl->ping = total/count;
if ( cl->ping > 999 ) {
cl->ping = 999;
}
}
// let the game dll know about the ping
ps = SV_GameClientNum( i );
ps->ping = cl->ping;
}
}
/*
==================
SV_CheckTimeouts
If a packet has not been received from a client for timeout->integer
seconds, drop the conneciton. Server time is used instead of
realtime to avoid dropping the local client while debugging.
When a client is normally dropped, the client_t goes into a zombie state
for a few seconds to make sure any final reliable message gets resent
if necessary
==================
*/
void SV_CheckTimeouts( void ) {
int i;
client_t *cl;
int droppoint;
int zombiepoint;
droppoint = svs.time - 1000 * sv_timeout->integer;
zombiepoint = svs.time - 1000 * sv_zombietime->integer;
for (i=0,cl=svs.clients ; i < sv_maxclients->integer ; i++,cl++) {
// message times may be wrong across a changelevel
if (cl->lastPacketTime > svs.time) {
cl->lastPacketTime = svs.time;
}
if (cl->state == CS_ZOMBIE
&& cl->lastPacketTime < zombiepoint) {
// using the client id cause the cl->name is empty at this point
Com_DPrintf( "Going from CS_ZOMBIE to CS_FREE for client %d\n", i );
cl->state = CS_FREE; // can now be reused
continue;
}
if ( cl->state >= CS_CONNECTED && cl->lastPacketTime < droppoint) {
// wait several frames so a debugger session doesn't
// cause a timeout
if ( ++cl->timeoutCount > 5 ) {
SV_DropClient (cl, "timed out");
cl->state = CS_FREE; // don't bother with zombie state
}
} else {
cl->timeoutCount = 0;
}
}
}
/*
==================
SV_CheckPaused
==================
*/
qboolean SV_CheckPaused( void ) {
int count;
client_t *cl;
int i;
if ( !cl_paused->integer ) {
return qfalse;
}
// only pause if there is just a single client connected
count = 0;
for (i=0,cl=svs.clients ; i < sv_maxclients->integer ; i++,cl++) {
if ( cl->state >= CS_CONNECTED && cl->netchan.remoteAddress.type != NA_BOT ) {
count++;
}
}
if ( count > 1 ) {
// don't pause
if (sv_paused->integer)
Cvar_Set("sv_paused", "0");
return qfalse;
}
if (!sv_paused->integer)
Cvar_Set("sv_paused", "1");
return qtrue;
}
/*
==================
SV_Frame
Player movement occurs as a result of packet events, which
happen before SV_Frame is called
==================
*/
void SV_Frame( int msec ) {
int frameMsec;
int startTime;
// the menu kills the server with this cvar
if ( sv_killserver->integer ) {
SV_Shutdown ("Server was killed.\n");
Cvar_Set( "sv_killserver", "0" );
return;
}
if ( !com_sv_running->integer ) {
return;
}
// allow pause if only the local client is connected
if ( SV_CheckPaused() ) {
return;
}
// if it isn't time for the next frame, do nothing
if ( sv_fps->integer < 1 ) {
Cvar_Set( "sv_fps", "10" );
}
frameMsec = 1000 / sv_fps->integer ;
sv.timeResidual += msec;
if (!com_dedicated->integer) SV_BotFrame( svs.time + sv.timeResidual );
if ( com_dedicated->integer && sv.timeResidual < frameMsec ) {
// NET_Sleep will give the OS time slices until either get a packet
// or time enough for a server frame has gone by
NET_Sleep(frameMsec - sv.timeResidual);
return;
}
// if time is about to hit the 32nd bit, kick all clients
// and clear sv.time, rather
// than checking for negative time wraparound everywhere.
// 2giga-milliseconds = 23 days, so it won't be too often
if ( svs.time > 0x70000000 ) {
SV_Shutdown( "Restarting server due to time wrapping" );
Cbuf_AddText( "vstr nextmap\n" );
return;
}
// this can happen considerably earlier when lots of clients play and the map doesn't change
if ( svs.nextSnapshotEntities >= 0x7FFFFFFE - svs.numSnapshotEntities ) {
SV_Shutdown( "Restarting server due to numSnapshotEntities wrapping" );
Cbuf_AddText( "vstr nextmap\n" );
return;
}
if( sv.restartTime && svs.time >= sv.restartTime ) {
sv.restartTime = 0;
Cbuf_AddText( "map_restart 0\n" );
return;
}
// update infostrings if anything has been changed
if ( cvar_modifiedFlags & CVAR_SERVERINFO ) {
SV_SetConfigstring( CS_SERVERINFO, Cvar_InfoString( CVAR_SERVERINFO ) );
cvar_modifiedFlags &= ~CVAR_SERVERINFO;
}
if ( cvar_modifiedFlags & CVAR_SYSTEMINFO ) {
SV_SetConfigstring( CS_SYSTEMINFO, Cvar_InfoString_Big( CVAR_SYSTEMINFO ) );
cvar_modifiedFlags &= ~CVAR_SYSTEMINFO;
}
if ( com_speeds->integer ) {
startTime = Sys_Milliseconds ();
} else {
startTime = 0; // quite a compiler warning
}
// update ping based on the all received frames
SV_CalcPings();
if (com_dedicated->integer) SV_BotFrame( svs.time );
// run the game simulation in chunks
while ( sv.timeResidual >= frameMsec ) {
sv.timeResidual -= frameMsec;
svs.time += frameMsec;
// let everything in the world think and move
VM_Call( gvm, GAME_RUN_FRAME, svs.time );
}
if ( com_speeds->integer ) {
time_game = Sys_Milliseconds () - startTime;
}
// check timeouts
SV_CheckTimeouts();
// send messages back to the clients
SV_SendClientMessages();
// send a heartbeat to the master if needed
SV_MasterHeartbeat();
}
//============================================================================