sv_main.c

Quake 2 Source code for students by Theerthan You can also download from idsoftwares.com

			continue;

#if 0
		if (cl->lastframe > 0)
			cl->frame_latency[sv.framenum&(LATENCY_COUNTS-1)] = sv.framenum - cl->lastframe + 1;
		else
			cl->frame_latency[sv.framenum&(LATENCY_COUNTS-1)] = 0;
#endif

		total = 0;
		count = 0;
		for (j=0 ; j<LATENCY_COUNTS ; j++)
		{
			if (cl->frame_latency[j] > 0)
			{
				count++;
				total += cl->frame_latency[j];
			}
		}
		if (!count)
			cl->ping = 0;
		else
#if 0
			cl->ping = total*100/count - 100;
#else
			cl->ping = total / count;
#endif

		// let the game dll know about the ping
		cl->edict->client->ping = cl->ping;
	}
}


/*
===================
SV_GiveMsec

Every few frames, gives all clients an allotment of milliseconds
for their command moves.  If they exceed it, assume cheating.
===================
*/
void SV_GiveMsec (void)
{
	int			i;
	client_t	*cl;

	if (sv.framenum & 15)
		return;

	for (i=0 ; i<maxclients->value ; i++)
	{
		cl = &svs.clients[i];
		if (cl->state == cs_free )
			continue;
		
		cl->commandMsec = 1800;		// 1600 + some slop
	}
}


/*
=================
SV_ReadPackets
=================
*/
void SV_ReadPackets (void)
{
	int			i;
	client_t	*cl;
	int			qport;

	while (NET_GetPacket (NS_SERVER, &net_from, &net_message))
	{
		// check for connectionless packet (0xffffffff) first
		if (*(int *)net_message.data == -1)
		{
			SV_ConnectionlessPacket ();
			continue;
		}

		// read the qport out of the message so we can fix up
		// stupid address translating routers
		MSG_BeginReading (&net_message);
		MSG_ReadLong (&net_message);		// sequence number
		MSG_ReadLong (&net_message);		// sequence number
		qport = MSG_ReadShort (&net_message) & 0xffff;

		// check for packets from connected clients
		for (i=0, cl=svs.clients ; i<maxclients->value ; i++,cl++)
		{
			if (cl->state == cs_free)
				continue;
			if (!NET_CompareBaseAdr (net_from, cl->netchan.remote_address))
				continue;
			if (cl->netchan.qport != qport)
				continue;
			if (cl->netchan.remote_address.port != net_from.port)
			{
				Com_Printf ("SV_ReadPackets: fixing up a translated port\n");
				cl->netchan.remote_address.port = net_from.port;
			}

			if (Netchan_Process(&cl->netchan, &net_message))
			{	// this is a valid, sequenced packet, so process it
				if (cl->state != cs_zombie)
				{
					cl->lastmessage = svs.realtime;	// don't timeout
					SV_ExecuteClientMessage (cl);
				}
			}
			break;
		}
		
		if (i != maxclients->value)
			continue;
	}
}

/*
==================
SV_CheckTimeouts

If a packet has not been received from a client for timeout->value
seconds, drop the conneciton.  Server frames are 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.realtime - 1000*timeout->value;
	zombiepoint = svs.realtime - 1000*zombietime->value;

	for (i=0,cl=svs.clients ; i<maxclients->value ; i++,cl++)
	{
		// message times may be wrong across a changelevel
		if (cl->lastmessage > svs.realtime)
			cl->lastmessage = svs.realtime;

		if (cl->state == cs_zombie
		&& cl->lastmessage < zombiepoint)
		{
			cl->state = cs_free;	// can now be reused
			continue;
		}
		if ( (cl->state == cs_connected || cl->state == cs_spawned) 
			&& cl->lastmessage < droppoint)
		{
			SV_BroadcastPrintf (PRINT_HIGH, "%s timed out\n", cl->name);
			SV_DropClient (cl); 
			cl->state = cs_free;	// don't bother with zombie state
		}
	}
}

/*
================
SV_PrepWorldFrame

This has to be done before the world logic, because
player processing happens outside RunWorldFrame
================
*/
void SV_PrepWorldFrame (void)
{
	edict_t	*ent;
	int		i;

	for (i=0 ; i<ge->num_edicts ; i++, ent++)
	{
		ent = EDICT_NUM(i);
		// events only last for a single message
		ent->s.event = 0;
	}

}


/*
=================
SV_RunGameFrame
=================
*/
void SV_RunGameFrame (void)
{
	if (host_speeds->value)
		time_before_game = Sys_Milliseconds ();

	// we always need to bump framenum, even if we
	// don't run the world, otherwise the delta
	// compression can get confused when a client
	// has the "current" frame
	sv.framenum++;
	sv.time = sv.framenum*100;

	// don't run if paused
	if (!sv_paused->value || maxclients->value > 1)
	{
		ge->RunFrame ();

		// never get more than one tic behind
		if (sv.time < svs.realtime)
		{
			if (sv_showclamp->value)
				Com_Printf ("sv highclamp\n");
			svs.realtime = sv.time;
		}
	}

	if (host_speeds->value)
		time_after_game = Sys_Milliseconds ();

}

/*
==================
SV_Frame

==================
*/
void SV_Frame (int msec)
{
	time_before_game = time_after_game = 0;

	// if server is not active, do nothing
	if (!svs.initialized)
		return;

    svs.realtime += msec;

	// keep the random time dependent
	rand ();

	// check timeouts
	SV_CheckTimeouts ();

	// get packets from clients
	SV_ReadPackets ();

	// move autonomous things around if enough time has passed
	if (!sv_timedemo->value && svs.realtime < sv.time)
	{
		// never let the time get too far off
		if (sv.time - svs.realtime > 100)
		{
			if (sv_showclamp->value)
				Com_Printf ("sv lowclamp\n");
			svs.realtime = sv.time - 100;
		}
		NET_Sleep(sv.time - svs.realtime);
		return;
	}

	// update ping based on the last known frame from all clients
	SV_CalcPings ();

	// give the clients some timeslices
	SV_GiveMsec ();

	// let everything in the world think and move
	SV_RunGameFrame ();

	// send messages back to the clients that had packets read this frame
	SV_SendClientMessages ();

	// save the entire world state if recording a serverdemo
	SV_RecordDemoMessage ();

	// send a heartbeat to the master if needed
	Master_Heartbeat ();

	// clear teleport flags, etc for next frame
	SV_PrepWorldFrame ();

}

//============================================================================

/*
================
Master_Heartbeat

Send a message to the master every few minutes to
let it know we are alive, and log information
================
*/
#define	HEARTBEAT_SECONDS	300
void Master_Heartbeat (void)
{
	char		*string;
	int			i;

	// pgm post3.19 change, cvar pointer not validated before dereferencing
	if (!dedicated || !dedicated->value)
		return;		// only dedicated servers send heartbeats

	// pgm post3.19 change, cvar pointer not validated before dereferencing
	if (!public_server || !public_server->value)
		return;		// a private dedicated game

	// check for time wraparound
	if (svs.last_heartbeat > svs.realtime)
		svs.last_heartbeat = svs.realtime;

	if (svs.realtime - svs.last_heartbeat < HEARTBEAT_SECONDS*1000)
		return;		// not time to send yet

	svs.last_heartbeat = svs.realtime;

	// send the same string that we would give for a status OOB command
	string = SV_StatusString();

	// send to group master
	for (i=0 ; i<MAX_MASTERS ; i++)
		if (master_adr[i].port)
		{
			Com_Printf ("Sending heartbeat to %s\n", NET_AdrToString (master_adr[i]));
			Netchan_OutOfBandPrint (NS_SERVER, master_adr[i], "heartbeat\n%s", string);
		}
}

/*
=================
Master_Shutdown

Informs all masters that this server is going down
=================
*/
void Master_Shutdown (void)
{
	int			i;

	// pgm post3.19 change, cvar pointer not validated before dereferencing
	if (!dedicated || !dedicated->value)
		return;		// only dedicated servers send heartbeats

	// pgm post3.19 change, cvar pointer not validated before dereferencing
	if (!public_server || !public_server->value)
		return;		// a private dedicated game

	// send to group master
	for (i=0 ; i<MAX_MASTERS ; i++)
		if (master_adr[i].port)
		{
			if (i > 0)
				Com_Printf ("Sending heartbeat to %s\n", NET_AdrToString (master_adr[i]));
			Netchan_OutOfBandPrint (NS_SERVER, master_adr[i], "shutdown");
		}
}

//============================================================================


/*
=================
SV_UserinfoChanged

Pull specific info from a newly changed userinfo string
into a more C freindly form.
=================
*/
void SV_UserinfoChanged (client_t *cl)
{
	char	*val;
	int		i;

	// call prog code to allow overrides
	ge->ClientUserinfoChanged (cl->edict, cl->userinfo);
	
	// name for C code
	strncpy (cl->name, Info_ValueForKey (cl->userinfo, "name"), sizeof(cl->name)-1);
	// mask off high bit
	for (i=0 ; i<sizeof(cl->name) ; i++)
		cl->name[i] &= 127;

	// rate command
	val = Info_ValueForKey (cl->userinfo, "rate");
	if (strlen(val))
	{
		i = atoi(val);
		cl->rate = i;
		if (cl->rate < 100)
			cl->rate = 100;
		if (cl->rate > 15000)
			cl->rate = 15000;
	}
	else
		cl->rate = 5000;

	// msg command
	val = Info_ValueForKey (cl->userinfo, "msg");
	if (strlen(val))
	{
		cl->messagelevel = atoi(val);
	}

}


//============================================================================

/*
===============
SV_Init

Only called at quake2.exe startup, not for each game
===============
*/
void SV_Init (void)
{
	SV_InitOperatorCommands	();

	rcon_password = Cvar_Get ("rcon_password", "", 0);
	Cvar_Get ("skill", "1", 0);
	Cvar_Get ("deathmatch", "0", CVAR_LATCH);
	Cvar_Get ("coop", "0", CVAR_LATCH);
	Cvar_Get ("dmflags", va("%i", DF_INSTANT_ITEMS), CVAR_SERVERINFO);
	Cvar_Get ("fraglimit", "0", CVAR_SERVERINFO);
	Cvar_Get ("timelimit", "0", CVAR_SERVERINFO);
	Cvar_Get ("cheats", "0", CVAR_SERVERINFO|CVAR_LATCH);
	Cvar_Get ("protocol", va("%i", PROTOCOL_VERSION), CVAR_SERVERINFO|CVAR_NOSET);;
	maxclients = Cvar_Get ("maxclients", "1", CVAR_SERVERINFO | CVAR_LATCH);
	hostname = Cvar_Get ("hostname", "noname", CVAR_SERVERINFO | CVAR_ARCHIVE);
	timeout = Cvar_Get ("timeout", "125", 0);
	zombietime = Cvar_Get ("zombietime", "2", 0);
	sv_showclamp = Cvar_Get ("showclamp", "0", 0);
	sv_paused = Cvar_Get ("paused", "0", 0);
	sv_timedemo = Cvar_Get ("timedemo", "0", 0);
	sv_enforcetime = Cvar_Get ("sv_enforcetime", "0", 0);
	allow_download = Cvar_Get ("allow_download", "1", CVAR_ARCHIVE);
	allow_download_players  = Cvar_Get ("allow_download_players", "0", CVAR_ARCHIVE);
	allow_download_models = Cvar_Get ("allow_download_models", "1", CVAR_ARCHIVE);
	allow_download_sounds = Cvar_Get ("allow_download_sounds", "1", CVAR_ARCHIVE);
	allow_download_maps	  = Cvar_Get ("allow_download_maps", "1", CVAR_ARCHIVE);

	sv_noreload = Cvar_Get ("sv_noreload", "0", 0);

	sv_airaccelerate = Cvar_Get("sv_airaccelerate", "0", CVAR_LATCH);

	public_server = Cvar_Get ("public", "0", 0);

	sv_reconnect_limit = Cvar_Get ("sv_reconnect_limit", "3", CVAR_ARCHIVE);

	SZ_Init (&net_message, net_message_buffer, sizeof(net_message_buffer));
}

/*
==================
SV_FinalMessage

Used by SV_Shutdown to send a final message to all
connected clients before the server goes down.  The messages are sent immediately,
not just stuck on the outgoing message list, because the server is going
to totally exit after returning from this function.
==================
*/
void SV_FinalMessage (char *message, qboolean reconnect)
{
	int			i;
	client_t	*cl;
	
	SZ_Clear (&net_message);
	MSG_WriteByte (&net_message, svc_print);
	MSG_WriteByte (&net_message, PRINT_HIGH);
	MSG_WriteString (&net_message, message);

	if (reconnect)
		MSG_WriteByte (&net_message, svc_reconnect);
	else
		MSG_WriteByte (&net_message, svc_disconnect);

	// send it twice
	// stagger the packets to crutch operating system limited buffers

	for (i=0, cl = svs.clients ; i<maxclients->value ; i++, cl++)
		if (cl->state >= cs_connected)
			Netchan_Transmit (&cl->netchan, net_message.cursize
			, net_message.data);

	for (i=0, cl = svs.clients ; i<maxclients->value ; i++, cl++)
		if (cl->state >= cs_connected)
			Netchan_Transmit (&cl->netchan, net_message.cursize
			, net_message.data);
}



/*
================
SV_Shutdown

Called when each game quits,
before Sys_Quit or Sys_Error
================
*/
void SV_Shutdown (char *finalmsg, qboolean reconnect)
{
	if (svs.clients)
		SV_FinalMessage (finalmsg, reconnect);

	Master_Shutdown ();
	SV_ShutdownGameProgs ();

	// free current level
	if (sv.demofile)
		fclose (sv.demofile);
	memset (&sv, 0, sizeof(sv));
	Com_SetServerState (sv.state);

	// free server static data
	if (svs.clients)
		Z_Free (svs.clients);
	if (svs.client_entities)
		Z_Free (svs.client_entities);
	if (svs.demofile)
		fclose (svs.demofile);
	memset (&svs, 0, sizeof(svs));
}