/*
sv_main.c - QW main server loop
Copyright (C) 1996-1997 Id Software, Inc.
Portions Copyright (C) 1999,2000  Nelson Rush.
Copyright (C) 1999,2000  contributors of the QuakeForge project
Please see the file "AUTHORS" for a list of contributors

This program 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.

This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include "sys.h"


#include <quakedef.h>
#include <qtypes.h>
#include <net.h>
#include <cmd.h>
#include <sys.h>
#include <console.h>
#include <protocol.h>
#include <server.h>

quakeparms_t host_parms;

qboolean	host_initialized;		// true if into command execution (compatability)

double		host_frametime;
double		realtime;				// without any filtering or bounding

int			host_hunklevel;

netadr_t	master_adr[MAX_MASTERS];	// address of group servers

client_t	*host_client;			// current client

cvar_t	sv_maxrate = {"sv_maxrate","0"};	// server maximum rate
cvar_t	sv_mintic = {"sv_mintic","0.03"};	// bound the size of the
cvar_t	sv_maxtic = {"sv_maxtic","0.1"};	// physics time tic 

cvar_t	developer = {"developer","0"};		// show extra messages

cvar_t	timeout = {"timeout","65"};		// seconds without any message
cvar_t	zombietime = {"zombietime", "2"};	// seconds to sink messages
											// after disconnect

cvar_t	rcon_password = {"rcon_password", ""};	// password for remote server commands
cvar_t	password = {"password", ""};	// password for entering the game
cvar_t	spectator_password = {"spectator_password", ""};	// password for entering as a sepctator

cvar_t	allow_download = {"allow_download", "1"};
cvar_t	allow_download_skins = {"allow_download_skins", "1"};
cvar_t	allow_download_models = {"allow_download_models", "1"};
cvar_t	allow_download_sounds = {"allow_download_sounds", "1"};
cvar_t	allow_download_maps = {"allow_download_maps", "1"};

cvar_t sv_highchars = {"sv_highchars", "1"};

cvar_t sv_phs = {"sv_phs", "1"};

cvar_t pausable	= {"pausable", "1"};


//
// game rules mirrored in svs.info
//
cvar_t	fraglimit = {"fraglimit","0",CVAR_USERINFO|CVAR_SERVERINFO};
cvar_t	timelimit = {"timelimit","0",CVAR_USERINFO|CVAR_SERVERINFO};
cvar_t	teamplay = {"teamplay","0",CVAR_USERINFO|CVAR_SERVERINFO};
cvar_t	samelevel = {"samelevel","0", CVAR_USERINFO|CVAR_SERVERINFO};
cvar_t	maxclients = {"maxclients","8", CVAR_USERINFO|CVAR_SERVERINFO};
cvar_t	maxspectators = {"maxspectators","8", CVAR_USERINFO|CVAR_SERVERINFO};
cvar_t	deathmatch = {"deathmatch","1", CVAR_USERINFO|CVAR_SERVERINFO};			// 0, 1, or 2
cvar_t	spawn = {"spawn","0", CVAR_USERINFO|CVAR_SERVERINFO};
cvar_t	watervis = {"watervis", "0", CVAR_USERINFO|CVAR_SERVERINFO};

cvar_t	hostname = {"hostname","unnamed", CVAR_USERINFO|CVAR_SERVERINFO};

QFile	*sv_logfile;
QFile	*sv_fraglogfile;

void SV_AcceptClient (netadr_t adr, int userid, char *userinfo);


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

qboolean ServerPaused(void)
{
	return sv.paused;
}

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

Quake calls this before calling Sys_Quit or Sys_Error
================
*/
void SV_Shutdown (void)
{
	Shutdown_Master ();
	if (sv_logfile)
	{
		Qclose (sv_logfile);
		sv_logfile = NULL;
	}
	if (sv_fraglogfile)
	{
		Qclose (sv_fraglogfile);
		sv_logfile = NULL;
	}
	NET_Shutdown ();
}

/*
================
SV_Error

Sends a datagram to all the clients informing them of the server crash,
then exits
================
*/
void SV_Error (char *error, ...)
{
	va_list		argptr;
	static	char		string[1024];
	static	qboolean inerror = false;

	if (inerror)
		Sys_Error ("SV_Error: recursively entered (%s)", string);

	inerror = true;

	va_start (argptr, error);
	vsnprintf (string, sizeof(string), error, argptr);
	va_end (argptr);

	Con_Printf ("SV_Error: %s\n",string);

	SV_FinalMessage (va("server crashed: %s\n", string));
		
	SV_Shutdown ();

	Sys_Error ("SV_Error: %s\n",string);
}

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

Used by SV_Error and SV_Quit_f 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)
{
	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);
	MSG_WriteByte (&net_message, svc_disconnect);

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



/*
=====================
SV_DropClient

Called when the player is totally leaving the server, either willingly
or unwillingly.  This is NOT called if the entire server is quiting
or crashing.
=====================
*/
void SV_DropClient (client_t *drop)
{
	// add the disconnect
	MSG_WriteByte (&drop->netchan.message, svc_disconnect);

	if (drop->state == cs_spawned) {
		if (!drop->spectator)
		{
			// call the prog function for removing a client
			// this will set the body to a dead frame, among other things
			pr_global_struct->self = EDICT_TO_PROG(drop->edict);
			PR_ExecuteProgram (pr_global_struct->ClientDisconnect);
		}
		else if (SpectatorDisconnect)
		{
			// call the prog function for removing a client
			// this will set the body to a dead frame, among other things
			pr_global_struct->self = EDICT_TO_PROG(drop->edict);
			PR_ExecuteProgram (SpectatorDisconnect);
		}
	}

	if (drop->spectator)
		Con_Printf ("Spectator %s removed\n",drop->name);
	else
		Con_Printf ("Client %s removed\n",drop->name);

	if (drop->download)
	{
		Qclose (drop->download);
		drop->download = NULL;
	}
	if (drop->upload)
	{
		Qclose (drop->upload);
		drop->upload = NULL;
	}
	*drop->uploadfn = 0;

	drop->state = cs_zombie;		// become free in a few seconds
	drop->connection_started = realtime;	// for zombie timeout

	drop->old_frags = 0;
	drop->edict->v.frags = 0;
	drop->name[0] = 0;
	memset (drop->userinfo, 0, sizeof(drop->userinfo));

// send notification to all remaining clients
	SV_FullClientUpdate (drop, &sv.reliable_datagram);
}


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

/*
===================
SV_CalcPing

===================
*/
int SV_CalcPing (client_t *cl)
{
	float		ping;
	int			i;
	int			count;
	register	client_frame_t *frame;

	ping = 0;
	count = 0;
	for (frame = cl->frames, i=0 ; i<UPDATE_BACKUP ; i++, frame++)
	{
		if (frame->ping_time > 0)
		{
			ping += frame->ping_time;
			count++;
		}
	}
	if (!count)
		return 9999;
	ping /= count;

	return ping*1000;
}

/*
===================
SV_FullClientUpdate

Writes all update values to a sizebuf
===================
*/
void SV_FullClientUpdate (client_t *client, sizebuf_t *buf)
{
	int		i;
	char	info[MAX_INFO_STRING];

	i = client - svs.clients;

//Sys_Printf("SV_FullClientUpdate:  Updated frags for client %d\n", i);

	MSG_WriteByte (buf, svc_updatefrags);
	MSG_WriteByte (buf, i);
	MSG_WriteShort (buf, client->old_frags);
	
	MSG_WriteByte (buf, svc_updateping);
	MSG_WriteByte (buf, i);
	MSG_WriteShort (buf, client->ping);
	
	MSG_WriteByte (buf, svc_updatepl);
	MSG_WriteByte (buf, i);
	MSG_WriteByte (buf, client->lossage);
	
	MSG_WriteByte (buf, svc_updateentertime);
	MSG_WriteByte (buf, i);
	MSG_WriteFloat (buf, realtime - client->connection_started);

	strcpy (info, client->userinfo);
	Info_RemovePrefixedKeys (info, '_');	// server passwords, etc

	MSG_WriteByte (buf, svc_updateuserinfo);
	MSG_WriteByte (buf, i);
	MSG_WriteLong (buf, client->userid);
	MSG_WriteString (buf, info);
}

/*
===================
SV_FullClientUpdateToClient

Writes all update values to a client's reliable stream
===================
*/
void SV_FullClientUpdateToClient (client_t *client, client_t *cl)
{
	ClientReliableCheckBlock(cl, 24 + strlen(client->userinfo));
	if (cl->num_backbuf) {
		SV_FullClientUpdate (client, &cl->backbuf);
		ClientReliable_FinishWrite(cl);
	} else
		SV_FullClientUpdate (client, &cl->netchan.message);
}


/*
==============================================================================

CONNECTIONLESS COMMANDS

==============================================================================
*/

/*
================
SVC_Status

Responds with all the info that qplug or qspy can see
This message can be up to around 5k with worst case string lengths.
================
*/
void SVC_Status (void)
{
	int		i;
	client_t	*cl;
	int		ping;
	int		top, bottom;

	Cmd_TokenizeString ("status");
	SV_BeginRedirect (RD_PACKET);
	Con_Printf ("%s\n", svs.info);
	for (i=0 ; i<MAX_CLIENTS ; i++)
	{
		cl = &svs.clients[i];
		if ((cl->state == cs_connected || cl->state == cs_spawned ) && !cl->spectator)
		{
			top = atoi(Info_ValueForKey (cl->userinfo, "topcolor"));
			bottom = atoi(Info_ValueForKey (cl->userinfo, "bottomcolor"));
			top = (top < 0) ? 0 : ((top > 13) ? 13 : top);
			bottom = (bottom < 0) ? 0 : ((bottom > 13) ? 13 : bottom);
			ping = cl->ping;
			Con_Printf ("%i %i %i %i \"%s\" \"%s\" %i %i\n", cl->userid, 
				cl->old_frags, (int)(realtime - cl->connection_started)/60,
				ping, cl->name, Info_ValueForKey (cl->userinfo, "skin"), top, bottom);
		}
	}
	SV_EndRedirect ();
}

/*
===================
SV_CheckLog

===================
*/
#define	LOG_HIGHWATER	4096
#define	LOG_FLUSH		10*60
void SV_CheckLog (void)
{
	sizebuf_t	*sz;

	sz = &svs.log[svs.logsequence&1];

	// bump sequence if allmost full, or ten minutes have passed and
	// there is something still sitting there
	if (sz->cursize > LOG_HIGHWATER
	|| (realtime - svs.logtime > LOG_FLUSH && sz->cursize) )
	{
		// swap buffers and bump sequence
		svs.logtime = realtime;
		svs.logsequence++;
		sz = &svs.log[svs.logsequence&1];
		sz->cursize = 0;
		Con_Printf ("beginning fraglog sequence %i\n", svs.logsequence);
	}

}

/*
================
SVC_Log

Responds with all the logged frags for ranking programs.
If a sequence number is passed as a parameter and it is
the same as the current sequence, an A2A_NACK will be returned
instead of the data.
================
*/
void SVC_Log (void)
{
	int		seq;
	char	data[MAX_DATAGRAM+64];

	if (Cmd_Argc() == 2)
		seq = atoi(Cmd_Argv(1));
	else
		seq = -1;

	if (seq == svs.logsequence-1 || !sv_fraglogfile)
	{	// they allready have this data, or we aren't logging frags
		data[0] = A2A_NACK;
		NET_SendPacket (1, data, net_from);
		return;
	}

	Con_DPrintf ("sending log %i to %s\n", svs.logsequence-1, NET_AdrToString(net_from));

	snprintf(data, sizeof(data), "stdlog %i\n", svs.logsequence-1);
	strcat (data, (char *)svs.log_buf[((svs.logsequence-1)&1)]);

	NET_SendPacket (strlen(data)+1, data, net_from);
}

/*
================
SVC_Ping

Just responds with an acknowledgement
================
*/
void SVC_Ping (void)
{
	char	data;

	data = A2A_ACK;

	NET_SendPacket (1, &data, net_from);
}

/*
=================
SVC_GetChallenge

Returns a challenge number that can be used
in a subsequent client_connect command.
We do this to prevent denial of service attacks that
flood the server with invalid connection IPs.  With a
challenge, they must give a valid IP address.
=================
*/
void SVC_GetChallenge (void)
{
	int		i;
	int		oldest;
	int		oldestTime;

	oldest = 0;
	oldestTime = 0x7fffffff;

	// see if we already have a challenge for this ip
	for (i = 0 ; i < MAX_CHALLENGES ; i++)
	{
		if (NET_CompareBaseAdr (net_from, svs.challenges[i].adr))
			break;
		if (svs.challenges[i].time < oldestTime)
		{
			oldestTime = svs.challenges[i].time;
			oldest = i;
		}
	}

	if (i == MAX_CHALLENGES)
	{
		// overwrite the oldest
		svs.challenges[oldest].challenge = (rand() << 16) ^ rand();
		svs.challenges[oldest].adr = net_from;
		svs.challenges[oldest].time = realtime;
		i = oldest;
	}

	// send it back
	Netchan_OutOfBandPrint (net_from, "%c%i", S2C_CHALLENGE, 
			svs.challenges[i].challenge);
}

/*
==================
SVC_DirectConnect

A connection request that did not come from the master
==================
*/
void SVC_DirectConnect (void)
{
	char		userinfo[1024];
	static		int	userid;
	netadr_t	adr;
	int			i;
	client_t	*cl, *newcl;
	client_t	temp;
	edict_t		*ent;
	int			edictnum;
	char		*s;
	int			clients, spectators;
	qboolean	spectator;
	int			qport;
	int			version;
	int			challenge;

	version = atoi(Cmd_Argv(1));
	if (version != PROTOCOL_VERSION)
	{
		Netchan_OutOfBandPrint (net_from, "%c\nServer is version %s.\n", A2C_PRINT, VERSION);
		Con_Printf ("* rejected connect from version %i\n", version);
		return;
	}

	qport = atoi(Cmd_Argv(2));

	challenge = atoi(Cmd_Argv(3));

	// note an extra byte is needed to replace spectator key
	strncpy (userinfo, Cmd_Argv(4), sizeof(userinfo)-2);
	userinfo[sizeof(userinfo) - 2] = 0;

	// see if the challenge is valid
	for (i=0 ; i<MAX_CHALLENGES ; i++)
	{
		if (NET_CompareBaseAdr (net_from, svs.challenges[i].adr))
		{
			if (challenge == svs.challenges[i].challenge)
				break;		// good
			Netchan_OutOfBandPrint (net_from, "%c\nBad challenge.\n", A2C_PRINT);
			return;
		}
	}
	if (i == MAX_CHALLENGES)
	{
		Netchan_OutOfBandPrint (net_from, "%c\nNo challenge for address.\n", A2C_PRINT);
		return;
	}

	// check for password or spectator_password
	s = Info_ValueForKey (userinfo, "spectator");
	if (s[0] && strcmp(s, "0"))
	{
		if (spectator_password.string[0] && 
			stricmp(spectator_password.string, "none") &&
			strcmp(spectator_password.string, s) )
		{	// failed
			Con_Printf ("%s:spectator password failed\n", NET_AdrToString (net_from));
			Netchan_OutOfBandPrint (net_from, "%c\nrequires a spectator password\n\n", A2C_PRINT);
			return;
		}
		Info_RemoveKey (userinfo, "spectator"); // remove passwd
		Info_SetValueForStarKey (userinfo, "*spectator", "1", MAX_INFO_STRING);
		spectator = true;
	}
	else
	{
		s = Info_ValueForKey (userinfo, "password");
		if (password.string[0] && 
			stricmp(password.string, "none") &&
			strcmp(password.string, s) )
		{
			Con_Printf ("%s:password failed\n", NET_AdrToString (net_from));
			Netchan_OutOfBandPrint (net_from, "%c\nserver requires a password\n\n", A2C_PRINT);
			return;
		}
		spectator = false;
		Info_RemoveKey (userinfo, "password"); // remove passwd
	}

	adr = net_from;
	userid++;	// so every client gets a unique id

	newcl = &temp;
	memset (newcl, 0, sizeof(client_t));

	newcl->userid = userid;

	// works properly
	if (!sv_highchars.value) {
		byte *p, *q;

		for (p = (byte *)newcl->userinfo, q = (byte *)userinfo; 
			*q && p < (byte *)newcl->userinfo + sizeof(newcl->userinfo)-1; q++)
			if (*q > 31 && *q <= 127)
				*p++ = *q;
	} else
		strncpy (newcl->userinfo, userinfo, sizeof(newcl->userinfo)-1);

	// if there is allready a slot for this ip, drop it
	for (i=0,cl=svs.clients ; i<MAX_CLIENTS ; i++,cl++)
	{
		if (cl->state == cs_free)
			continue;
		if (NET_CompareBaseAdr (adr, cl->netchan.remote_address)
			&& ( cl->netchan.qport == qport 
			|| adr.port == cl->netchan.remote_address.port ))
		{
			if (cl->state == cs_connected) {
				Con_Printf("%s:dup connect\n", NET_AdrToString (adr));
				userid--;
				return;
			}

			Con_Printf ("%s:reconnect\n", NET_AdrToString (adr));
			SV_DropClient (cl);
			break;
		}
	}

	// count up the clients and spectators
	clients = 0;
	spectators = 0;
	for (i=0,cl=svs.clients ; i<MAX_CLIENTS ; i++,cl++)
	{
		if (cl->state == cs_free)
			continue;
		if (cl->spectator)
			spectators++;
		else
			clients++;
	}

	// if at server limits, refuse connection
	if ( maxclients.value > MAX_CLIENTS )
		Cvar_SetValue ("maxclients", MAX_CLIENTS);
	if (maxspectators.value > MAX_CLIENTS)
		Cvar_SetValue ("maxspectators", MAX_CLIENTS);
	if (maxspectators.value + maxclients.value > MAX_CLIENTS)
		Cvar_SetValue ("maxspectators", MAX_CLIENTS - maxspectators.value + maxclients.value);
	if ( (spectator && spectators >= (int)maxspectators.value)
		|| (!spectator && clients >= (int)maxclients.value) )
	{
		Con_Printf ("%s:full connect\n", NET_AdrToString (adr));
		Netchan_OutOfBandPrint (adr, "%c\nserver is full\n\n", A2C_PRINT);
		return;
	}

	// find a client slot
	newcl = NULL;
	for (i=0,cl=svs.clients ; i<MAX_CLIENTS ; i++,cl++)
	{
		if (cl->state == cs_free)
		{
			newcl = cl;
			break;
		}
	}
	if (!newcl)
	{
		Con_Printf ("WARNING: miscounted available clients\n");
		return;
	}

	
	// build a new connection
	// accept the new client
	// this is the only place a client_t is ever initialized
	*newcl = temp;

	Netchan_OutOfBandPrint (adr, "%c", S2C_CONNECTION );

	edictnum = (newcl-svs.clients)+1;
	
	Netchan_Setup (&newcl->netchan , adr, qport);

	newcl->state = cs_connected;

	newcl->datagram.allowoverflow = true;
	newcl->datagram.data = newcl->datagram_buf;
	newcl->datagram.maxsize = sizeof(newcl->datagram_buf);

	// spectator mode can ONLY be set at join time
	newcl->spectator = spectator;

	ent = EDICT_NUM(edictnum);	
	newcl->edict = ent;
	
	// parse some info from the info strings
	SV_ExtractFromUserinfo (newcl);

	// JACK: Init the floodprot stuff.
	for (i=0; i<10; i++)
		newcl->whensaid[i] = 0.0;
	newcl->whensaidhead = 0;
	newcl->lockedtill = 0;

	// call the progs to get default spawn parms for the new client
	PR_ExecuteProgram (pr_global_struct->SetNewParms);
	for (i=0 ; i<NUM_SPAWN_PARMS ; i++)
		newcl->spawn_parms[i] = (&pr_global_struct->parm1)[i];

	if (newcl->spectator)
		Con_Printf ("Spectator %s connected\n", newcl->name);
	else
		Con_Printf ("Client %s connected\n", newcl->name);
	newcl->sendinfo = true;

	// QuakeForge stuff.
	newcl->msecs = 0;
	newcl->msec_cheating = 0;
	newcl->last_check = realtime;
}

int Rcon_Validate (void)
{
	if (!strlen (rcon_password.string))
		return 0;

	if (strcmp (Cmd_Argv(1), rcon_password.string) )
		return 0;

	return 1;
}

/*
===============
SVC_RemoteCommand

A client issued an rcon command.
Shift down the remaining args
Redirect all printfs
===============
*/
void SVC_RemoteCommand (void)
{
	int		i;
	char	remaining[1024];


	if (!Rcon_Validate ()) {
		Con_Printf ("Bad rcon from %s:\n%s\n"
			, NET_AdrToString (net_from), net_message.data+4);

		SV_BeginRedirect (RD_PACKET);

		Con_Printf ("Bad rcon_password.\n");

	} else {

		Con_Printf ("Rcon from %s:\n%s\n"
			, NET_AdrToString (net_from), net_message.data+4);

		SV_BeginRedirect (RD_PACKET);

		remaining[0] = 0;

		for (i=2 ; i<Cmd_Argc() ; i++)
		{
			strcat (remaining, Cmd_Argv(i) );
			strcat (remaining, " ");
		}

		Cmd_ExecuteString (remaining, src_command);

	}

	SV_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 (void)
{
	char	*s;
	char	*c;

	MSG_BeginReading ();
	MSG_ReadLong ();		// skip the -1 marker

	s = MSG_ReadStringLine ();

	Cmd_TokenizeString (s);

	c = Cmd_Argv(0);

	if (!strcmp(c, "ping") || ( c[0] == A2A_PING && (c[1] == 0 || c[1] == '\n')) )
	{
		SVC_Ping ();
		return;
	}
	if (c[0] == A2A_ACK && (c[1] == 0 || c[1] == '\n') )
	{
		Con_Printf ("A2A_ACK from %s\n", NET_AdrToString (net_from));
		return;
	}
	else if (!strcmp(c,"status"))
	{
		SVC_Status ();
		return;
	}
	else if (!strcmp(c,"log"))
	{
		SVC_Log ();
		return;
	}
	else if (!strcmp(c,"connect"))
	{
		SVC_DirectConnect ();
		return;
	}
	else if (!strcmp(c,"getchallenge"))
	{
		SVC_GetChallenge ();
		return;
	}
	else if (!strcmp(c, "rcon"))
		SVC_RemoteCommand ();
	else
		Con_Printf ("bad connectionless packet from %s:\n%s\n"
		, NET_AdrToString (net_from), s);
}

/*
==============================================================================

PACKET FILTERING
 

You can add or remove addresses from the filter list with:

addip <ip>
removeip <ip>

The ip address is specified in dot format, and any unspecified digits will match any value, so you can specify an entire class C network with "addip 192.246.40".

Removeip will only remove an address specified exactly the same way.  You cannot addip a subnet, then removeip a single host.

listip
Prints the current list of filters.

writeip
Dumps "addip <ip>" commands to listip.cfg so it can be execed at a later date.  The filter lists are not saved and restored by default, because I beleive it would cause too much confusion.

filterban <0 or 1>

If 1 (the default), then ip addresses matching the current list will be prohibited from entering the game.  This is the default setting.

If 0, then only addresses matching the list will be allowed.  This lets you easily set up a private game, or a game that only allows players from your local network.


==============================================================================
*/


typedef struct
{
	unsigned	mask;
	unsigned	compare;
} ipfilter_t;

#define	MAX_IPFILTERS	1024

ipfilter_t	ipfilters[MAX_IPFILTERS];
int			numipfilters;

cvar_t	filterban = {"filterban", "1"};

/*
=================
StringToFilter
=================
*/
qboolean StringToFilter (char *s, ipfilter_t *f)
{
	char	num[128];
	int		i, j;
	byte	b[4];
	byte	m[4];
	
	for (i=0 ; i<4 ; i++)
	{
		b[i] = 0;
		m[i] = 0;
	}
	
	for (i=0 ; i<4 ; i++)
	{
		if (*s < '0' || *s > '9')
		{
			Con_Printf ("Bad filter address: %s\n", s);
			return false;
		}
		
		j = 0;
		while (*s >= '0' && *s <= '9')
		{
			num[j++] = *s++;
		}
		num[j] = 0;
		b[i] = atoi(num);
		if (b[i] != 0)
			m[i] = 255;

		if (!*s)
			break;
		s++;
	}
	
	f->mask = *(unsigned *)m;
	f->compare = *(unsigned *)b;
	
	return true;
}

/*
=================
SV_AddIP_f
=================
*/
void SV_AddIP_f (void)
{
	int		i;
	
	for (i=0 ; i<numipfilters ; i++)
		if (ipfilters[i].compare == 0xffffffff)
			break;		// free spot
	if (i == numipfilters)
	{
		if (numipfilters == MAX_IPFILTERS)
		{
			Con_Printf ("IP filter list is full\n");
			return;
		}
		numipfilters++;
	}
	
	if (!StringToFilter (Cmd_Argv(1), &ipfilters[i]))
		ipfilters[i].compare = 0xffffffff;
}

/*
=================
SV_RemoveIP_f
=================
*/
void SV_RemoveIP_f (void)
{
	ipfilter_t	f;
	int			i, j;

	if (!StringToFilter (Cmd_Argv(1), &f))
		return;
	for (i=0 ; i<numipfilters ; i++)
		if (ipfilters[i].mask == f.mask
		&& ipfilters[i].compare == f.compare)
		{
			for (j=i+1 ; j<numipfilters ; j++)
				ipfilters[j-1] = ipfilters[j];
			numipfilters--;
			Con_Printf ("Removed.\n");
			return;
		}
	Con_Printf ("Didn't find %s.\n", Cmd_Argv(1));
}

/*
=================
SV_ListIP_f
=================
*/
void SV_ListIP_f (void)
{
	int		i;
	byte	b[4];

	Con_Printf ("Filter list:\n");
	for (i=0 ; i<numipfilters ; i++)
	{
		*(unsigned *)b = ipfilters[i].compare;
		Con_Printf ("%3i.%3i.%3i.%3i\n", b[0], b[1], b[2], b[3]);
	}
}

/*
=================
SV_WriteIP_f
=================
*/
void SV_WriteIP_f (void)
{
	QFile	*f;
	char	name[MAX_OSPATH];
	byte	b[4];
	int		i;

	snprintf(name, sizeof(name), "%s/listip.cfg", com_gamedir);

	Con_Printf ("Writing %s.\n", name);

	f = Qopen (name, "wb");
	if (!f)
	{
		Con_Printf ("Couldn't open %s\n", name);
		return;
	}
	
	for (i=0 ; i<numipfilters ; i++)
	{
		*(unsigned *)b = ipfilters[i].compare;
		Qprintf (f, "addip %i.%i.%i.%i\n", b[0], b[1], b[2], b[3]);
	}
	
	Qclose (f);
}

/*
=================
SV_SendBan
=================
*/
void SV_SendBan (void)
{
	char		data[128];

	data[0] = data[1] = data[2] = data[3] = 0xff;
	data[4] = A2C_PRINT;
	data[5] = 0;
	strcat (data, "\nbanned.\n");
	
	NET_SendPacket (strlen(data), data, net_from);
}

/*
=================
SV_FilterPacket
=================
*/
qboolean SV_FilterPacket (void)
{
	int		i;
	unsigned	in;
	
	in = *(unsigned *)net_from.ip;

	for (i=0 ; i<numipfilters ; i++)
		if ( (in & ipfilters[i].mask) == ipfilters[i].compare)
			return filterban.value;

	return !filterban.value;
}

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

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

	good = false;
	while (NET_GetPacket ())
	{
		if (SV_FilterPacket ())
		{
			SV_SendBan ();	// tell them we aren't listening...
			continue;
		}

		// 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 ();
		MSG_ReadLong ();		// sequence number
		MSG_ReadLong ();		// sequence number
		qport = MSG_ReadShort () & 0xffff;

		// check for packets from connected clients
		for (i=0, cl=svs.clients ; i<MAX_CLIENTS ; 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)
			{
				Con_DPrintf ("SV_ReadPackets: fixing up a translated port\n");
				cl->netchan.remote_address.port = net_from.port;
			}
			if (Netchan_Process(&cl->netchan))
			{	// this is a valid, sequenced packet, so process it
				svs.stats.packets++;
				good = true;
				cl->send_message = true;	// reply at end of frame
				if (cl->state != cs_zombie)
					SV_ExecuteClientMessage (cl);
			}
			break;
		}
		
		if (i != MAX_CLIENTS)
			continue;
	
		// packet is not from a known client
		//	Con_Printf ("%s:sequenced packet without connection\n"
		// ,NET_AdrToString(net_from));
	}
}

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

If a packet has not been received from a client in timeout.value
seconds, drop the conneciton.

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;
	float	droptime;
	int	nclients;
	
	droptime = realtime - timeout.value;
	nclients = 0;

	for (i=0,cl=svs.clients ; i<MAX_CLIENTS ; i++,cl++)
	{
		if (cl->state == cs_connected || cl->state == cs_spawned) {
			if (!cl->spectator)
				nclients++;
			if (cl->netchan.last_received < droptime) {
				SV_BroadcastPrintf (PRINT_HIGH, "%s timed out\n", cl->name);
				SV_DropClient (cl); 
				cl->state = cs_free;	// don't bother with zombie state
			}
		}
		if (cl->state == cs_zombie && 
			realtime - cl->connection_started > zombietime.value)
		{
			cl->state = cs_free;	// can now be reused
		}
	}
	if (sv.paused && !nclients) {
		// nobody left, unpause the server
		SV_TogglePause("Pause released since no players are left.\n");
	}
}

/*
===================
SV_GetConsoleCommands

Add them exactly as if they had been typed at the console
===================
*/
void SV_GetConsoleCommands (void)
{
	char	*cmd;

	while (1)
	{
		cmd = Sys_ConsoleInput ();
		if (!cmd)
			break;
		Cbuf_AddText (cmd);
	}
}

/*
===================
SV_CheckVars

===================
*/
void SV_CheckVars (void)
{
	static char *pw, *spw;
	int			v;

	if (password.string == pw && spectator_password.string == spw)
		return;
	pw = password.string;
	spw = spectator_password.string;

	v = 0;
	if (pw && pw[0] && strcmp(pw, "none"))
		v |= 1;
	if (spw && spw[0] && strcmp(spw, "none"))
		v |= 2;

	Con_Printf ("Updated needpass.\n");
	if (!v)
		Info_SetValueForKey (svs.info, "needpass", "", MAX_SERVERINFO_STRING);
	else
		Info_SetValueForKey (svs.info, "needpass", va("%i",v), MAX_SERVERINFO_STRING);
}

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

==================
*/
void SV_Frame (float time)
{
	static double	start, end;
	
	start = Sys_DoubleTime ();
	svs.stats.idle += start - end;
	
// keep the random time dependent
	rand ();

// decide the simulation time
	if (!sv.paused) {
		realtime += time;
		sv.time += time;
	}

// check timeouts
	SV_CheckTimeouts ();

// toggle the log buffer if full
	SV_CheckLog ();

// move autonomous things around if enough time has passed
	if (!sv.paused)
		SV_Physics ();

// get packets
	SV_ReadPackets ();

// check for commands typed to the host
	SV_GetConsoleCommands ();
	
// process console commands
	Cbuf_Execute ();

	SV_CheckVars ();

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

// Breathe in... Breathe out.. breath in...
	HeartBeat ();

// collect timing statistics
	end = Sys_DoubleTime ();
	svs.stats.active += end-start;
	if (++svs.stats.count == STATFRAMES)
	{
		svs.stats.latched_active = svs.stats.active;
		svs.stats.latched_idle = svs.stats.idle;
		svs.stats.latched_packets = svs.stats.packets;
		svs.stats.active = 0;
		svs.stats.idle = 0;
		svs.stats.packets = 0;
		svs.stats.count = 0;
	}
}

/*
===============
SV_InitLocal
===============
*/
void SV_InitLocal (void)
{
	int		i;
	extern	cvar_t	sv_maxvelocity;
	extern	cvar_t	sv_gravity;
	extern	cvar_t	sv_aim;
	extern	cvar_t	sv_stopspeed;
	extern	cvar_t	sv_spectatormaxspeed;
	extern	cvar_t	sv_accelerate;
	extern	cvar_t	sv_airaccelerate;
	extern	cvar_t	sv_wateraccelerate;
	extern	cvar_t	sv_friction;
	extern	cvar_t	sv_waterfriction;

	SV_InitOperatorCommands	();
	SV_UserInit ();
	
	Cvar_RegisterVariable (&rcon_password);
	Cvar_RegisterVariable (&password);
	Cvar_RegisterVariable (&spectator_password);

	Cvar_RegisterVariable (&sv_mintic);
	Cvar_RegisterVariable (&sv_maxtic);

	Cvar_RegisterVariable (&fraglimit);
	Cvar_RegisterVariable (&timelimit);
	Cvar_RegisterVariable (&teamplay);
	Cvar_RegisterVariable (&samelevel);
	Cvar_RegisterVariable (&maxclients);
	Cvar_RegisterVariable (&maxspectators);
	Cvar_RegisterVariable (&hostname);
	Cvar_RegisterVariable (&deathmatch);
	Cvar_RegisterVariable (&spawn);
	Cvar_RegisterVariable (&watervis);

	Cvar_RegisterVariable (&sv_maxrate);
	Cvar_RegisterVariable (&developer);

	Cvar_RegisterVariable (&timeout);
	Cvar_RegisterVariable (&zombietime);

	Cvar_RegisterVariable (&sv_maxvelocity);
	Cvar_RegisterVariable (&sv_gravity);
	Cvar_RegisterVariable (&sv_stopspeed);
	Cvar_RegisterVariable (&sv_maxspeed);
	Cvar_RegisterVariable (&sv_spectatormaxspeed);
	Cvar_RegisterVariable (&sv_accelerate);
	Cvar_RegisterVariable (&sv_airaccelerate);
	Cvar_RegisterVariable (&sv_wateraccelerate);
	Cvar_RegisterVariable (&sv_friction);
	Cvar_RegisterVariable (&sv_waterfriction);

	Cvar_RegisterVariable (&sv_aim);

	Cvar_RegisterVariable (&filterban);
	
	Cvar_RegisterVariable (&allow_download);
	Cvar_RegisterVariable (&allow_download_skins);
	Cvar_RegisterVariable (&allow_download_models);
	Cvar_RegisterVariable (&allow_download_sounds);
	Cvar_RegisterVariable (&allow_download_maps);

	Cvar_RegisterVariable (&sv_highchars);

	Cvar_RegisterVariable (&sv_phs);

	Cvar_RegisterVariable (&pausable);

	Cmd_AddCommand ("addip", SV_AddIP_f);
	Cmd_AddCommand ("removeip", SV_RemoveIP_f);
	Cmd_AddCommand ("listip", SV_ListIP_f);
	Cmd_AddCommand ("writeip", SV_WriteIP_f);

	for (i=0 ; i<MAX_MODELS ; i++)
		snprintf(localmodels[i], sizeof(localmodels[i]), "*%i", i);

	Info_SetValueForStarKey (svs.info, "*qf_version", QF_VERSION, MAX_SERVERINFO_STRING);
	Info_SetValueForStarKey (svs.info, "*version", VERSION, MAX_SERVERINFO_STRING);

	// init fraglog stuff
	svs.logsequence = 1;
	svs.logtime = realtime;
	svs.log[0].data = svs.log_buf[0];
	svs.log[0].maxsize = sizeof(svs.log_buf[0]);
	svs.log[0].cursize = 0;
	svs.log[0].allowoverflow = true;
	svs.log[1].data = svs.log_buf[1];
	svs.log[1].maxsize = sizeof(svs.log_buf[1]);
	svs.log[1].cursize = 0;
	svs.log[1].allowoverflow = true;
}


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


// Lots of nifty checks done in here.. Lives by the heartbeat
void  HeartBeat_Check( void) {
	int i;
	client_t        *cl;


	for (i=0, cl = svs.clients ; i<MAX_CLIENTS ; i++, cl++)
	{
		if (cl->state == cs_connected || cl->state == cs_spawned) {
			// Put stuff in here that you want done to every client

			// Slades maxrate function
			if((1/cl->netchan.rate) > sv_maxrate.value && sv_maxrate.value) {
				SV_BroadcastPrintf (PRINT_HIGH, "%s was kicked for having his rate to high\n", cl->name);
				SV_ClientPrintf (cl, PRINT_HIGH, "You were kicked from the game for having a rate higher then %5.0f\n", sv_maxrate.value);
				SV_DropClient(cl);
			}

			// Lets build our ping query tables -- Slade
			cl->ping=SV_CalcPing(cl);
		}
	}
}


// This is the HeartBeat of the server.. center of alot of useful stuff
// -- Slade
void HeartBeat (void)
{

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

	svs.last_heartbeat = realtime;
	if(svs.beatcount == MAX_BEATCOUNT)
		svs.beatcount = 0;
	svs.beatcount++;

	// Do this stuff every HeartBeat
	HeartBeat_Check();

	// Do this every 100 Beats
	if(svs.beatcount == 100) {
		HeartBeat_Master();
	}
}


/*
================
HeartBeat_Master

Send a message to the master every few minutes to
let it know we are alive, and log information
================
*/
void HeartBeat_Master (void)
{
	char		string[2048];
	int			active;
	int			i;

	//
	// count active users
	//
	active = 0;
	for (i=0 ; i<MAX_CLIENTS ; i++)
		if (svs.clients[i].state == cs_connected ||
		svs.clients[i].state == cs_spawned )
			active++;

	svs.mheartbeat_sequence++;
	snprintf(string, sizeof(string), "%c\n%i\n%i\n", S2M_HEARTBEAT,
		svs.mheartbeat_sequence, active);


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

/*
=================
Shutdown_Master

Informs all masters that this server is going down
=================
*/
void Shutdown_Master (void)
{
	char		string[2048];
	int			i;

	snprintf(string, sizeof(string), "%c\n", S2M_SHUTDOWN);

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

/*
=================
SV_ExtractFromUserinfo

Pull specific info from a newly changed userinfo string
into a more C freindly form.
=================
*/
void SV_ExtractFromUserinfo (client_t *cl)
{
	char	*val, *p, *q;
	int		i;
	client_t	*client;
	int		dupc = 1;
	char	newname[80];


	// name for C code
	val = Info_ValueForKey (cl->userinfo, "name");

	// trim user name
	strncpy(newname, val, sizeof(newname) - 1);
	newname[sizeof(newname) - 1] = 0;

	for (p = newname; (*p == ' ' || *p == '\r' || *p == '\n') && *p; p++)
		;

	if (p != newname && !*p) {
		//white space only
		strcpy(newname, "unnamed");
		p = newname;
	}

	if (p != newname && *p) {
		for (q = newname; *p; *q++ = *p++)
			;
		*q = 0;
	}
	for (p = newname + strlen(newname) - 1; p != newname && (*p == ' ' || *p == '\r' || *p == '\n') ; p--)
		;
	p[1] = 0;

	if (strcmp(val, newname)) {
		Info_SetValueForKey (cl->userinfo, "name", newname, MAX_INFO_STRING);
		val = Info_ValueForKey (cl->userinfo, "name");
	}

	if (!val[0] || !stricmp(val, "console")) {
		Info_SetValueForKey (cl->userinfo, "name", "unnamed", MAX_INFO_STRING);
		val = Info_ValueForKey (cl->userinfo, "name");
	}

	// check to see if another user by the same name exists
	while (1) {
		for (i=0, client = svs.clients ; i<MAX_CLIENTS ; i++, client++) {
			if (client->state != cs_spawned || client == cl)
				continue;
			if (!stricmp(client->name, val))
				break;
		}
		if (i != MAX_CLIENTS) { // dup name
			if (strlen(val) > sizeof(cl->name) - 1)
				val[sizeof(cl->name) - 4] = 0;
			p = val;

			if (val[0] == '(') {
				if (val[2] == ')')
					p = val + 3;
				else if (val[3] == ')')
					p = val + 4;
			}

			snprintf(newname, sizeof(newname), "(%d)%-.40s", dupc++, p);
			Info_SetValueForKey (cl->userinfo, "name", newname, MAX_INFO_STRING);
			val = Info_ValueForKey (cl->userinfo, "name");
		} else
			break;
	}
	
	if (strncmp(val, cl->name, strlen(cl->name))) {
		if (!sv.paused) {
			if (!cl->lastnametime || realtime - cl->lastnametime > 5) {
				cl->lastnamecount = 0;
				cl->lastnametime = realtime;
			} else if (cl->lastnamecount++ > 4) {
				SV_BroadcastPrintf (PRINT_HIGH, "%s was kicked for name spam\n", cl->name);
				SV_ClientPrintf (cl, PRINT_HIGH, "You were kicked from the game for name spamming\n");
				SV_DropClient (cl); 
				return;
			}
		}
				
		if (cl->state >= cs_spawned && !cl->spectator)
			SV_BroadcastPrintf (PRINT_HIGH, "%s changed name to %s\n", cl->name, val);
	}


	strncpy (cl->name, val, sizeof(cl->name)-1);	

	// rate command
	val = Info_ValueForKey (cl->userinfo, "rate");
	if (strlen(val))
	{
		i = atoi(val);
		if (i < 500)
			i = 500;
		if (i > 10000)
			i = 10000;
		cl->netchan.rate = 1.0/i;
	}

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

}


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

/*
====================
SV_InitNet
====================
*/
void SV_InitNet (void)
{
	int	port;
	int	p;

	port = PORT_SERVER;
	p = COM_CheckParm ("-port");
	if (p && p < com_argc)
	{
		port = atoi(com_argv[p+1]);
		Con_Printf ("Port: %i\n", port);
	}
	NET_Init (port);

	Netchan_Init ();

	// heartbeats will allways be sent to the id master
	svs.last_heartbeat = -99999;		// send immediately
//	NET_StringToAdr ("192.246.40.70:27000", &idmaster_adr);
}


/*
====================
SV_Init
====================
*/
void SV_Init (quakeparms_t *parms)
{
	COM_InitArgv (parms->argc, parms->argv);
//	COM_AddParm ("-game");
//	COM_AddParm ("qw");

	if (COM_CheckParm ("-minmemory"))
		parms->memsize = MINIMUM_MEMORY;

	host_parms = *parms;

	if (parms->memsize < MINIMUM_MEMORY)
		SV_Error ("Only %4.1f megs of memory reported, can't execute game", parms->memsize / (float)0x100000);

	Memory_Init (parms->membase, parms->memsize);
	Cbuf_Init ();
	Cmd_Init ();	

	COM_Init ();
	
	PR_Init ();
	Mod_Init ();

	SV_InitNet ();

	SV_InitLocal ();
	Sys_Init ();
	Pmove_Init ();

	Hunk_AllocName (0, "-HOST_HUNKLEVEL-");
	host_hunklevel = Hunk_LowMark ();

	Cbuf_InsertText ("exec server.cfg\n");

	host_initialized = true;
	
	Con_Printf ("Exe: "__TIME__" "__DATE__"\n");
	Con_Printf ("%4.1f megabyte heap\n",parms->memsize/ (1024*1024.0));	

	Con_Printf ("\nServer Version %s\n\n", QF_VERSION);

	Con_Printf ("======== QuakeWorld Initialized ========\n");
	
// process command line arguments
	Cmd_StuffCmds_f ();
	Cbuf_Execute ();

// if a map wasn't specified on the command line, spawn start.map
	if (sv.state == ss_dead)
		Cmd_ExecuteString ("map start", src_command);
	if (sv.state == ss_dead)
		SV_Error ("Couldn't spawn a server");
}