/*
 * ngIRCd -- The Next Generation IRC Daemon
 * Copyright (c)2001-2008 Alexander Barton (alex@barton.de)
 *
 * 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.
 * Please read the file COPYING, README and AUTHORS for more information.
 *
 * IRC info commands
 */


#include "portab.h"

#include "imp.h"
#include <assert.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>

#include "ngircd.h"
#include "conn-func.h"
#include "conn-zip.h"
#include "client.h"
#include "channel.h"
#include "resolve.h"
#include "conf.h"
#include "defines.h"
#include "log.h"
#include "messages.h"
#include "match.h"
#include "tool.h"
#include "parse.h"
#include "irc-write.h"

#include "exp.h"
#include "irc-info.h"


GLOBAL bool
IRC_ADMIN(CLIENT *Client, REQUEST *Req )
{
	CLIENT *target, *prefix;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if(( Req->argc > 1 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	/* Ziel suchen */
	if( Req->argc == 1 ) target = Client_Search( Req->argv[0] );
	else target = Client_ThisServer( );

	/* Prefix ermitteln */
	if( Client_Type( Client ) == CLIENT_SERVER ) prefix = Client_Search( Req->prefix );
	else prefix = Client;
	if( ! prefix ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	/* An anderen Server weiterleiten? */
	if( target != Client_ThisServer( ))
	{
		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( prefix, ERR_NOSUCHSERVER_MSG, Client_ID( prefix ), Req->argv[0] );

		/* forwarden */
		IRC_WriteStrClientPrefix( target, prefix, "ADMIN %s", Req->argv[0] );
		return CONNECTED;
	}

	/* mit Versionsinfo antworten */
	if( ! IRC_WriteStrClient( Client, RPL_ADMINME_MSG, Client_ID( prefix ), Conf_ServerName )) return DISCONNECTED;
	if( ! IRC_WriteStrClient( Client, RPL_ADMINLOC1_MSG, Client_ID( prefix ), Conf_ServerAdmin1 )) return DISCONNECTED;
	if( ! IRC_WriteStrClient( Client, RPL_ADMINLOC2_MSG, Client_ID( prefix ), Conf_ServerAdmin2 )) return DISCONNECTED;
	if( ! IRC_WriteStrClient( Client, RPL_ADMINEMAIL_MSG, Client_ID( prefix ), Conf_ServerAdminMail )) return DISCONNECTED;

	IRC_SetPenalty( Client, 1 );
	return CONNECTED;
} /* IRC_ADMIN */


/**
 * Handler for the IRC command "INFO".
 * See RFC 2812 section 3.4.10.
 */
GLOBAL bool
IRC_INFO(CLIENT * Client, REQUEST * Req)
{
	CLIENT *target, *prefix;
	char msg[510];

	assert(Client != NULL);
	assert(Req != NULL);

	/* Wrong number of parameters? */
	if (Req->argc > 1)
		return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
					  Client_ID(Client), Req->command);

	/* Determine prefix */
	if (Client_Type(Client) == CLIENT_SERVER)
		prefix = Client_Search(Req->prefix);
	else
		prefix = Client;
	if (!prefix)
		return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
					  Client_ID(Client), Req->prefix);

	/* Look for a target */
	if (Req->argc > 0)
		target = Client_Search(Req->argv[0]);
	else
		target = Client_ThisServer();
	
	/* Make sure that the target is a server */
	if (target && Client_Type(target) != CLIENT_SERVER)
		target = Client_Introducer(target);

	if (!target)
		return IRC_WriteStrClient(prefix, ERR_NOSUCHSERVER_MSG,
					  Client_ID(prefix), Req->argv[0]);

	/* Pass on to another server? */
	if (target != Client_ThisServer()) {
		IRC_WriteStrClientPrefix(target, prefix, "INFO %s",
					 Req->argv[0]);
		return CONNECTED;
	}

	if (!IRC_WriteStrClient(Client, RPL_INFO_MSG, Client_ID(prefix),
				NGIRCd_Version))
		return DISCONNECTED;
	
	strlcpy(msg, "Server has been started ", sizeof(msg));
	strlcat(msg, NGIRCd_StartStr, sizeof(msg));
	if (!IRC_WriteStrClient(Client, RPL_INFO_MSG, Client_ID(prefix), msg))
		return DISCONNECTED;

	if (!IRC_WriteStrClient(Client, RPL_ENDOFINFO_MSG, Client_ID(prefix)))
		return DISCONNECTED;

	IRC_SetPenalty(Client, 2);
	return CONNECTED;
} /* IRC_INFO */


GLOBAL bool
IRC_ISON( CLIENT *Client, REQUEST *Req )
{
	char rpl[COMMAND_LEN];
	CLIENT *c;
	char *ptr;
	int i;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if(( Req->argc < 1 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	strlcpy( rpl, RPL_ISON_MSG, sizeof rpl );
	for( i = 0; i < Req->argc; i++ )
	{
		ptr = strtok( Req->argv[i], " " );
		while( ptr )
		{
			ngt_TrimStr( ptr );
			c = Client_Search( ptr );
			if( c && ( Client_Type( c ) == CLIENT_USER ))
			{
				/* Dieser Nick ist "online" */
				strlcat( rpl, ptr, sizeof( rpl ));
				strlcat( rpl, " ", sizeof( rpl ));
			}
			ptr = strtok( NULL, " " );
		}
	}
	ngt_TrimLastChr(rpl, ' ');

	return IRC_WriteStrClient( Client, rpl, Client_ID( Client ) );
} /* IRC_ISON */


GLOBAL bool
IRC_LINKS( CLIENT *Client, REQUEST *Req )
{
	CLIENT *target, *from, *c;
	char *mask;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if(( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	/* Server-Mask ermitteln */
	if( Req->argc > 0 ) mask = Req->argv[Req->argc - 1];
	else mask = "*";

	/* Absender ermitteln */
	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
	else from = Client;
	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	/* An anderen Server forwarden? */
	if( Req->argc == 2 )
	{
		target = Client_Search( Req->argv[0] );
		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );
		else if( target != Client_ThisServer( )) return IRC_WriteStrClientPrefix( target, from, "LINKS %s %s", Req->argv[0], Req->argv[1] );
	}

	/* Wer ist der Absender? */
	if( Client_Type( Client ) == CLIENT_SERVER ) target = Client_Search( Req->prefix );
	else target = Client;
	if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	c = Client_First( );
	while( c )
	{
		if( Client_Type( c ) == CLIENT_SERVER )
		{
			if( ! IRC_WriteStrClient( target, RPL_LINKS_MSG, Client_ID( target ), Client_ID( c ), Client_ID( Client_TopServer( c ) ? Client_TopServer( c ) : Client_ThisServer( )), Client_Hops( c ), Client_Info( c ))) return DISCONNECTED;
		}
		c = Client_Next( c );
	}
	
	IRC_SetPenalty( target, 1 );
	return IRC_WriteStrClient( target, RPL_ENDOFLINKS_MSG, Client_ID( target ), mask );
} /* IRC_LINKS */


GLOBAL bool
IRC_LUSERS( CLIENT *Client, REQUEST *Req )
{
	CLIENT *target, *from;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if(( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	/* Absender ermitteln */
	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
	else from = Client;
	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	/* An anderen Server forwarden? */
	if( Req->argc == 2 )
	{
		target = Client_Search( Req->argv[1] );
		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[1] );
		else if( target != Client_ThisServer( )) return IRC_WriteStrClientPrefix( target, from, "LUSERS %s %s", Req->argv[0], Req->argv[1] );
	}

	/* Wer ist der Absender? */
	if( Client_Type( Client ) == CLIENT_SERVER ) target = Client_Search( Req->prefix );
	else target = Client;
	if( ! target ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	IRC_Send_LUSERS( target );

	IRC_SetPenalty( target, 1 );
	return CONNECTED;
} /* IRC_LUSERS */


GLOBAL bool
IRC_MOTD( CLIENT *Client, REQUEST *Req )
{
	CLIENT *from, *target;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	/* From aus Prefix ermitteln */
	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
	else from = Client;
	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	if( Req->argc == 1 )
	{
		/* an anderen Server forwarden */
		target = Client_Search( Req->argv[0] );
		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );

		if( target != Client_ThisServer( ))
		{
			/* Ok, anderer Server ist das Ziel: forwarden */
			return IRC_WriteStrClientPrefix( target, from, "MOTD %s", Req->argv[0] );
		}
	}

	IRC_SetPenalty( from, 3 );
	return IRC_Show_MOTD( from );
} /* IRC_MOTD */


GLOBAL bool
IRC_NAMES( CLIENT *Client, REQUEST *Req )
{
	char rpl[COMMAND_LEN], *ptr;
	CLIENT *target, *from, *c;
	CHANNEL *chan;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if( Req->argc > 2 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	/* From aus Prefix ermitteln */
	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
	else from = Client;
	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	if( Req->argc == 2 )
	{
		/* an anderen Server forwarden */
		target = Client_Search( Req->argv[1] );
		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[1] );

		if( target != Client_ThisServer( ))
		{
			/* Ok, anderer Server ist das Ziel: forwarden */
			return IRC_WriteStrClientPrefix( target, from, "NAMES %s :%s", Req->argv[0], Req->argv[1] );
		}
	}

	if( Req->argc > 0 )
	{
		/* bestimmte Channels durchgehen */
		ptr = strtok( Req->argv[0], "," );
		while( ptr )
		{
			chan = Channel_Search( ptr );
			if( chan )
			{
				/* Namen ausgeben */
				if( ! IRC_Send_NAMES( from, chan )) return DISCONNECTED;
			}
			if( ! IRC_WriteStrClient( from, RPL_ENDOFNAMES_MSG, Client_ID( from ), ptr )) return DISCONNECTED;

			/* naechsten Namen ermitteln */
			ptr = strtok( NULL, "," );
		}
		return CONNECTED;
	}

	/* alle Channels durchgehen */
	chan = Channel_First( );
	while( chan )
	{
		/* Namen ausgeben */
		if( ! IRC_Send_NAMES( from, chan )) return DISCONNECTED;

		/* naechster Channel */
		chan = Channel_Next( chan );
	}

	/* Nun noch alle Clients ausgeben, die in keinem Channel sind */
	c = Client_First( );
	snprintf( rpl, sizeof( rpl ), RPL_NAMREPLY_MSG, Client_ID( from ), "*", "*" );
	while( c )
	{
		if(( Client_Type( c ) == CLIENT_USER ) && ( Channel_FirstChannelOf( c ) == NULL ) && ( ! strchr( Client_Modes( c ), 'i' )))
		{
			/* Okay, das ist ein User: anhaengen */
			if( rpl[strlen( rpl ) - 1] != ':' ) strlcat( rpl, " ", sizeof( rpl ));
			strlcat( rpl, Client_ID( c ), sizeof( rpl ));

			if( strlen( rpl ) > ( LINE_LEN - CLIENT_NICK_LEN - 4 ))
			{
				/* Zeile wird zu lang: senden! */
				if( ! IRC_WriteStrClient( from, "%s", rpl )) return DISCONNECTED;
				snprintf( rpl, sizeof( rpl ), RPL_NAMREPLY_MSG, Client_ID( from ), "*", "*" );
			}
		}

		/* naechster Client */
		c = Client_Next( c );
	}
	if( rpl[strlen( rpl ) - 1] != ':')
	{
		/* es wurden User gefunden */
		if( ! IRC_WriteStrClient( from, "%s", rpl )) return DISCONNECTED;
	}

	IRC_SetPenalty( from, 1 );
	return IRC_WriteStrClient( from, RPL_ENDOFNAMES_MSG, Client_ID( from ), "*" );
} /* IRC_NAMES */


static unsigned int
t_diff(time_t *t, const time_t div)
{
	time_t diff, remain;

	diff = *t / div;

	remain = diff * div;
	*t -= remain;

	return diff;
}


static unsigned int
uptime_days(time_t *now)
{
	return t_diff(now, 60 * 60 * 24);
}


static unsigned int
uptime_hrs(time_t *now)
{
	return t_diff(now, 60 * 60);
}


static unsigned int
uptime_mins(time_t *now)
{
	 return t_diff(now, 60);
}


GLOBAL bool
IRC_STATS( CLIENT *Client, REQUEST *Req )
{
	CLIENT *from, *target, *cl;
	CONN_ID con;
	char query;
	COMMAND *cmd;
	time_t time_now;
	unsigned int days, hrs, mins;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if (Req->argc > 2)
		return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG, Client_ID(Client), Req->command);

	/* From aus Prefix ermitteln */
	if (Client_Type(Client) == CLIENT_SERVER)
		from = Client_Search(Req->prefix);
	else
		from = Client;

	if (! from)
		return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix);

	if (Req->argc == 2) {
		/* an anderen Server forwarden */
		target = Client_Search( Req->argv[1] );
		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER ))
			return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[1] );

		if( target != Client_ThisServer()) {
			/* Ok, anderer Server ist das Ziel: forwarden */
			return IRC_WriteStrClientPrefix( target, from, "STATS %s %s", Req->argv[0], Req->argv[1] );
		}
	}

	if (Req->argc > 0)
		query = Req->argv[0][0] ? Req->argv[0][0] : '*';
	else
		query = '*';

	switch (query) {
		case 'l':	/* Links */
		case 'L':
			time_now = time(NULL);
			for (con = Conn_First(); con != NONE ;con = Conn_Next(con)) {
				cl = Conn_GetClient(con);
				if (!cl)
					continue;
				if ((Client_Type(cl) == CLIENT_SERVER) || (cl == Client)) {
					/* Server link or our own connection */
#ifdef ZLIB
					if (Conn_Options(con) & CONN_ZIP) {
						if (!IRC_WriteStrClient(from, RPL_STATSLINKINFOZIP_MSG,
							Client_ID(from), Client_Mask(cl), Conn_SendQ(con),
							Conn_SendMsg(con), Zip_SendBytes(con), Conn_SendBytes(con),
							Conn_RecvMsg(con), Zip_RecvBytes(con), Conn_RecvBytes(con), (long)(time_now - Conn_StartTime(con))))
								return DISCONNECTED;
						continue;
					}
#endif
					if (!IRC_WriteStrClient(from, RPL_STATSLINKINFO_MSG, Client_ID(from),
						Client_Mask(cl), Conn_SendQ(con), Conn_SendMsg(con), Conn_SendBytes(con),
						Conn_RecvMsg(con), Conn_RecvBytes(con), (long)(time_now - Conn_StartTime(con))))
							return DISCONNECTED;
				}
			}
			break;
		case 'm':	/* IRC-Commands */
		case 'M':
			cmd = Parse_GetCommandStruct( );
			for (; cmd->name ; cmd++) {
				if (cmd->lcount == 0 && cmd->rcount == 0)
					continue;
				if (!IRC_WriteStrClient(from, RPL_STATSCOMMANDS_MSG, Client_ID(from),
						cmd->name, cmd->lcount, cmd->bytes, cmd->rcount))
							return DISCONNECTED;
			}
			break;
		case 'u':	/* server uptime */
		case 'U':
			time_now = time(NULL) - NGIRCd_Start;
			days = uptime_days(&time_now);
			hrs = uptime_hrs(&time_now);
			mins = uptime_mins(&time_now);
			if (!IRC_WriteStrClient(from, RPL_STATSUPTIME, Client_ID(from),
					days, hrs, mins, (unsigned int) time_now))
						return DISCONNECTED;
			break;
	}

	IRC_SetPenalty(from, 2);
	return IRC_WriteStrClient(from, RPL_ENDOFSTATS_MSG, Client_ID(from), query);
} /* IRC_STATS */


/**
 * Handler for the IRC command "SUMMON".
 * See RFC 2812 section 4.5. ngIRCd doesn't implement this functionality and
 * therefore answers with ERR_SUMMONDISABLED.
 */
GLOBAL bool
IRC_SUMMON(CLIENT * Client, REQUEST * Req)
{
	return IRC_WriteStrClient(Client, ERR_SUMMONDISABLED_MSG,
				  Client_ID(Client), Req->command);
} /* IRC_SUMMON */


GLOBAL bool
IRC_TIME( CLIENT *Client, REQUEST *Req )
{
	CLIENT *from, *target;
	char t_str[64];
	time_t t;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	/* From aus Prefix ermitteln */
	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
	else from = Client;
	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	if( Req->argc == 1 )
	{
		/* an anderen Server forwarden */
		target = Client_Search( Req->argv[0] );
		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG, Client_ID( Client ), Req->argv[0] );

		if( target != Client_ThisServer( ))
		{
			/* Ok, anderer Server ist das Ziel: forwarden */
			return IRC_WriteStrClientPrefix( target, from, "TIME %s", Req->argv[0] );
		}
	}

	t = time( NULL );
	(void)strftime( t_str, 60, "%A %B %d %Y -- %H:%M %Z", localtime( &t ));
	return IRC_WriteStrClient( from, RPL_TIME_MSG, Client_ID( from ), Client_ID( Client_ThisServer( )), t_str );
} /* IRC_TIME */


GLOBAL bool
IRC_USERHOST( CLIENT *Client, REQUEST *Req )
{
	char rpl[COMMAND_LEN];
	CLIENT *c;
	int max, i;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if(( Req->argc < 1 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	if( Req->argc > 5 ) max = 5;
	else max = Req->argc;

	strlcpy( rpl, RPL_USERHOST_MSG, sizeof rpl );
	for( i = 0; i < max; i++ )
	{
		c = Client_Search( Req->argv[i] );
		if( c && ( Client_Type( c ) == CLIENT_USER ))
		{
			/* Dieser Nick ist "online" */
			strlcat( rpl, Client_ID( c ), sizeof( rpl ));
			if( Client_HasMode( c, 'o' )) strlcat( rpl, "*", sizeof( rpl ));
			strlcat( rpl, "=", sizeof( rpl ));
			if( Client_HasMode( c, 'a' )) strlcat( rpl, "-", sizeof( rpl ));
			else strlcat( rpl, "+", sizeof( rpl ));
			strlcat( rpl, Client_User( c ), sizeof( rpl ));
			strlcat( rpl, "@", sizeof( rpl ));
			strlcat( rpl, Client_Hostname( c ), sizeof( rpl ));
			strlcat( rpl, " ", sizeof( rpl ));
		}
	}
	ngt_TrimLastChr( rpl, ' ');

	return IRC_WriteStrClient( Client, rpl, Client_ID( Client ) );
} /* IRC_USERHOST */


/**
 * Handler for the IRC command "USERS".
 * See RFC 2812 section 4.6. As suggested there the command is disabled.
 */
GLOBAL bool
IRC_USERS(CLIENT * Client, REQUEST * Req)
{
	return IRC_WriteStrClient(Client, ERR_USERSDISABLED_MSG,
				  Client_ID(Client), Req->command);
} /* IRC_USERS */


GLOBAL bool
IRC_VERSION( CLIENT *Client, REQUEST *Req )
{
	CLIENT *target, *prefix;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Falsche Anzahl Parameter? */
	if(( Req->argc > 1 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	/* Ziel suchen */
	if( Req->argc == 1 ) target = Client_Search( Req->argv[0] );
	else target = Client_ThisServer( );

	/* Prefix ermitteln */
	if( Client_Type( Client ) == CLIENT_SERVER ) prefix = Client_Search( Req->prefix );
	else prefix = Client;
	if( ! prefix ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	/* An anderen Server weiterleiten? */
	if( target != Client_ThisServer( ))
	{
		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER )) return IRC_WriteStrClient( prefix, ERR_NOSUCHSERVER_MSG, Client_ID( prefix ), Req->argv[0] );

		/* forwarden */
		IRC_WriteStrClientPrefix( target, prefix, "VERSION %s", Req->argv[0] );
		return CONNECTED;
	}

	/* send version information */
	IRC_SetPenalty(Client, 1);
	return IRC_WriteStrClient(Client, RPL_VERSION_MSG, Client_ID(prefix),
				  PACKAGE_NAME, PACKAGE_VERSION,
				  NGIRCd_DebugLevel, Conf_ServerName,
				  NGIRCd_VersionAddition);
} /* IRC_VERSION */


static bool
write_whoreply(CLIENT *Client, CLIENT *c, const char *channelname, const char *flags)
{
	return IRC_WriteStrClient(Client, RPL_WHOREPLY_MSG, Client_ID(Client), channelname,
			Client_User(c), Client_Hostname(c), Client_ID(Client_Introducer(c)), Client_ID(c),
			flags, Client_Hops(c), Client_Info(c));
}


static const char *
who_flags_status(const char *client_modes)
{
	if (strchr(client_modes, 'a'))
		return "G"; /* away */
	return "H";
}


static const char *
who_flags_qualifier(const char *chan_user_modes)
{
	if (strchr(chan_user_modes, 'o'))
		return "@";
	else if (strchr(chan_user_modes, 'v'))
		return "+";
	return "";
}


static bool
IRC_Send_WHO(CLIENT *Client, CHANNEL *Chan, bool OnlyOps)
{
	bool is_visible, is_member, is_ircop;
	CL2CHAN *cl2chan;
	const char *client_modes;
	const char *chan_user_modes;
	char flags[8];
	CLIENT *c;

	assert( Client != NULL );
	assert( Chan != NULL );

	is_member = Channel_IsMemberOf(Chan, Client);

	/* Secret channel? */
	if (!is_member && strchr(Channel_Modes(Chan), 's'))
		return IRC_WriteStrClient(Client, RPL_ENDOFWHO_MSG, Client_ID(Client), Channel_Name(Chan));

	cl2chan = Channel_FirstMember(Chan);
	for (; cl2chan ; cl2chan = Channel_NextMember(Chan, cl2chan)) {
		c = Channel_GetClient(cl2chan);

		client_modes = Client_Modes(c);
		is_ircop = strchr(client_modes, 'o') != NULL;
		if (OnlyOps && !is_ircop)
			continue;

		is_visible = strchr(client_modes, 'i') == NULL;
		if (is_member || is_visible) {
			strcpy(flags, who_flags_status(client_modes));
			if (is_ircop)
				strlcat(flags, "*", sizeof(flags));

			chan_user_modes = Channel_UserModes(Chan, c);
			strlcat(flags, who_flags_qualifier(chan_user_modes), sizeof(flags));

			if (!write_whoreply(Client, c, Channel_Name(Chan), flags))
				return DISCONNECTED;
		}
	}
	return IRC_WriteStrClient(Client, RPL_ENDOFWHO_MSG, Client_ID(Client), Channel_Name(Chan));
} /* IRC_Send_WHO */



static bool
MatchCaseInsensitive(const char *pattern, const char *searchme)
{
	char haystack[COMMAND_LEN];

	strlcpy(haystack, searchme, sizeof(haystack));

	ngt_LowerStr(haystack);

	return Match(pattern, haystack);
}


GLOBAL bool
IRC_WHO( CLIENT *Client, REQUEST *Req )
{
	bool only_ops, have_arg, client_match;
	const char *channelname, *client_modes, *chan_user_modes;
	char pattern[COMMAND_LEN];
	char flags[4];
	CL2CHAN *cl2chan;
	CHANNEL *chan, *cn;
	CLIENT *c;

	assert( Client != NULL );
	assert( Req != NULL );

	if (Req->argc > 2)
		return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	only_ops = false;
	have_arg = false;

	if (Req->argc == 2) {
		if (strcmp(Req->argv[1], "o") == 0)
			only_ops = true;
#ifdef STRICT_RFC
		else return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG, Client_ID(Client), Req->command);
#endif
	}

	IRC_SetPenalty(Client, 1);
	if (Req->argc >= 1) { /* Channel or Mask. */
		chan = Channel_Search(Req->argv[0]);
		if (chan)
			return IRC_Send_WHO(Client, chan, only_ops);
		if (strcmp(Req->argv[0], "0") != 0) { /* RFC stupidity, same as no arguments */
			have_arg = true;
			strlcpy(pattern, Req->argv[0], sizeof(pattern));
			ngt_LowerStr(pattern);
			IRC_SetPenalty(Client, 3);
		}
	}

	for (c = Client_First(); c != NULL; c = Client_Next(c)) {
		if (Client_Type(c) != CLIENT_USER)
			continue;
		 /*
		  * RFC 2812, 3.6.1:
		  * In the absence of the parameter, all visible (users who aren't
		  * invisible (user mode +i) and who don't have a common channel
		  * with the requesting client) are listed.
		  *
		  * The same result can be achieved by using a [sic] of "0"
		  * or any wildcard which will end up matching every visible user.
		  *
		  * The [sic] passed to WHO is matched against users' host, server, real name and
		  * nickname if the channel cannot be found.
		  */
		client_modes = Client_Modes(c);
		if (strchr(client_modes, 'i'))
			continue;

		if (only_ops && !strchr(client_modes, 'o'))
			continue;

		if (have_arg) { /* match pattern against user host/server/name/nick */
			client_match = MatchCaseInsensitive(pattern, Client_Hostname(c)); /* user's host */
			if (!client_match)
				client_match = MatchCaseInsensitive(pattern, Client_ID(Client_Introducer(c))); /* server */
			if (!client_match)
				client_match = Match(Req->argv[0], Client_Info(c)); /* realname */
			if (!client_match)
				client_match = MatchCaseInsensitive(pattern, Client_ID(c)); /* nick name */

			if (!client_match) /* This isn't the client you're looking for */
				continue;
		}

		strcpy(flags, who_flags_status(client_modes));

		if (strchr(client_modes, 'o')) /* this client is an operator */
			strlcat(flags, "*", sizeof(flags));

		/* Search suitable channel */
		cl2chan = Channel_FirstChannelOf(c);
		while (cl2chan) {
			cn = Channel_GetChannel(cl2chan);
			if (Channel_IsMemberOf(cn, Client) ||
				    !strchr(Channel_Modes(cn), 's'))
			{
				channelname = Channel_Name(cn);
				break;
			}
			cl2chan = Channel_NextChannelOf(c, cl2chan);
		}
		if (cl2chan) {
			chan = Channel_GetChannel(cl2chan);
			chan_user_modes = Channel_UserModes(chan, c);
			strlcat(flags, who_flags_qualifier(chan_user_modes), sizeof(flags));
		} else
			channelname = "*";

		if (!write_whoreply(Client, c, channelname, flags))
			return DISCONNECTED;
	}

	if (Req->argc > 0)
		channelname = Req->argv[0];
	else
		channelname = "*";

	return IRC_WriteStrClient(Client, RPL_ENDOFWHO_MSG, Client_ID(Client), channelname);
} /* IRC_WHO */


GLOBAL bool
IRC_WHOIS( CLIENT *Client, REQUEST *Req )
{
	CLIENT *from, *target, *c;
	char str[LINE_LEN + 1];
	CL2CHAN *cl2chan;
	CHANNEL *chan;

	assert( Client != NULL );
	assert( Req != NULL );

	/* Bad number of parameters? */
	if(( Req->argc < 1 ) || ( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	/* Search client */
	c = Client_Search( Req->argv[Req->argc - 1] );
	if(( ! c ) || ( Client_Type( c ) != CLIENT_USER )) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->argv[Req->argc - 1] );

	/* Search sender of the WHOIS */
	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
	else from = Client;
	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );

	/* Forward to other server? */
	if( Req->argc > 1 )
	{
		/* Search target server (can be specified as nick of that server!) */
		target = Client_Search( Req->argv[0] );
		if( ! target ) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( from ), Req->argv[0] );
	}
	else target = Client_ThisServer( );

	assert( target != NULL );

	if(( Client_NextHop( target ) != Client_ThisServer( )) && ( Client_Type( Client_NextHop( target )) == CLIENT_SERVER )) return IRC_WriteStrClientPrefix( target, from, "WHOIS %s :%s", Req->argv[0], Req->argv[1] );

	/* Nick, user and name */
	if( ! IRC_WriteStrClient( from, RPL_WHOISUSER_MSG, Client_ID( from ), Client_ID( c ), Client_User( c ), Client_Hostname( c ), Client_Info( c ))) return DISCONNECTED;

	/* Server */
	if( ! IRC_WriteStrClient( from, RPL_WHOISSERVER_MSG, Client_ID( from ), Client_ID( c ), Client_ID( Client_Introducer( c )), Client_Info( Client_Introducer( c )))) return DISCONNECTED;

	/* Channels */
	snprintf( str, sizeof( str ), RPL_WHOISCHANNELS_MSG, Client_ID( from ), Client_ID( c ));
	cl2chan = Channel_FirstChannelOf( c );
	while( cl2chan )
	{
		chan = Channel_GetChannel( cl2chan );
		assert( chan != NULL );

		/* next */
		cl2chan = Channel_NextChannelOf( c, cl2chan );

		/* Secret channel? */
		if( strchr( Channel_Modes( chan ), 's' ) && ! Channel_IsMemberOf( chan, Client )) continue;

		/* Concatenate channel names */
		if( str[strlen( str ) - 1] != ':' ) strlcat( str, " ", sizeof( str ));
		if( strchr( Channel_UserModes( chan, c ), 'o' )) strlcat( str, "@", sizeof( str ));
		else if( strchr( Channel_UserModes( chan, c ), 'v' )) strlcat( str, "+", sizeof( str ));
		strlcat( str, Channel_Name( chan ), sizeof( str ));

		if( strlen( str ) > ( LINE_LEN - CHANNEL_NAME_LEN - 4 ))
		{
			/* Line becomes too long: send it! */
			if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
			snprintf( str, sizeof( str ), RPL_WHOISCHANNELS_MSG, Client_ID( from ), Client_ID( c ));
		}
	}
	if( str[strlen( str ) - 1] != ':')
	{
		/* There is data left to send: */
		if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
	}

	/* IRC-Operator? */
	if( Client_HasMode( c, 'o' ))
	{
		if( ! IRC_WriteStrClient( from, RPL_WHOISOPERATOR_MSG, Client_ID( from ), Client_ID( c ))) return DISCONNECTED;
	}

	/* Idle and signon time (local clients only!) */
	if (Client_Conn(c) > NONE ) {
		if (! IRC_WriteStrClient(from, RPL_WHOISIDLE_MSG,
			Client_ID(from), Client_ID(c),
			(unsigned long)Conn_GetIdle(Client_Conn(c)),
			(unsigned long)Conn_GetSignon(Client_Conn(c))))
				return DISCONNECTED;
	}

	/* Away? */
	if( Client_HasMode( c, 'a' ))
	{
		if( ! IRC_WriteStrClient( from, RPL_AWAY_MSG, Client_ID( from ), Client_ID( c ), Client_Away( c ))) return DISCONNECTED;
	}

	/* End of Whois */
	return IRC_WriteStrClient( from, RPL_ENDOFWHOIS_MSG, Client_ID( from ), Client_ID( c ));
} /* IRC_WHOIS */


/**
 * IRC "WHOWAS" function.
 * This function implements the IRC command "WHOWHAS". It handles local
 * requests and request that should be forwarded to other servers.
 */
GLOBAL bool
IRC_WHOWAS( CLIENT *Client, REQUEST *Req )
{
	CLIENT *target, *prefix;
	WHOWAS *whowas;
	int max, last, count, i;
	char t_str[60];
	
	assert( Client != NULL );
	assert( Req != NULL );

	/* Wrong number of parameters? */
	if(( Req->argc < 1 ) || ( Req->argc > 3 ))
		return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
					   Client_ID( Client ), Req->command );

	/* Search taget */
	if( Req->argc == 3 )
		target = Client_Search( Req->argv[2] );
	else
		target = Client_ThisServer( );

	/* Get prefix */
	if( Client_Type( Client ) == CLIENT_SERVER )
		prefix = Client_Search( Req->prefix );
	else
		prefix = Client;

	if( ! prefix )
		return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG,
					   Client_ID( Client ), Req->prefix );

	/* Forward to other server? */
	if( target != Client_ThisServer( ))
	{
		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER ))
			return IRC_WriteStrClient( prefix, ERR_NOSUCHSERVER_MSG,
						   Client_ID( prefix ),
						   Req->argv[2] );

		/* Forward */
		IRC_WriteStrClientPrefix( target, prefix, "WHOWAS %s %s %s",
					  Req->argv[0], Req->argv[1],
					  Req->argv[2] );
		return CONNECTED;
	}
	
	whowas = Client_GetWhowas( );
	last = Client_GetLastWhowasIndex( );
	if( last < 0 ) last = 0;
	
	if( Req->argc > 1 )
	{
		max = atoi( Req->argv[1] );
		if( max < 1 ) max = MAX_WHOWAS;
	}
	else
		max = DEFAULT_WHOWAS;
	
	i = last;
	count = 0;
	do
	{
		/* Used entry? */
		if( whowas[i].time > 0 &&
		    strcasecmp( Req->argv[0], whowas[i].id ) == 0 )
		{
			(void)strftime( t_str, sizeof(t_str),
					"%a %b %d %H:%M:%S %Y",
					localtime( &whowas[i].time ));
		
			if( ! IRC_WriteStrClient( prefix, RPL_WHOWASUSER_MSG,
						  Client_ID( prefix ),
						  whowas[i].id,
						  whowas[i].user,
						  whowas[i].host, 
						  whowas[i].info ))
				return DISCONNECTED;
		
			if( ! IRC_WriteStrClient( prefix, RPL_WHOISSERVER_MSG,
						  Client_ID( prefix ),
						  whowas[i].id,
						  whowas[i].server, t_str ))
				return DISCONNECTED;
		
			count++;
			if( count >= max ) break;
		}
		
		/* previos entry */
		i--;

		/* "underflow", wrap around */
		if( i < 0 ) i = MAX_WHOWAS - 1;
	} while( i != last );
	
	return IRC_WriteStrClient( prefix, RPL_ENDOFWHOWAS_MSG,
				   Client_ID( prefix ), Req->argv[0] );
} /* IRC_WHOWAS */


GLOBAL bool
IRC_Send_LUSERS( CLIENT *Client )
{
	unsigned long cnt;
#ifndef STRICT_RFC
	unsigned long max;
#endif

	assert( Client != NULL );

	/* Users, services and serevers in the network */
	if( ! IRC_WriteStrClient( Client, RPL_LUSERCLIENT_MSG, Client_ID( Client ), Client_UserCount( ), Client_ServiceCount( ), Client_ServerCount( ))) return DISCONNECTED;

	/* Number of IRC operators */
	cnt = Client_OperCount( );
	if( cnt > 0 )
	{
		if( ! IRC_WriteStrClient( Client, RPL_LUSEROP_MSG, Client_ID( Client ), cnt )) return DISCONNECTED;
	}

	/* Unknown connections */
	cnt = Client_UnknownCount( );
	if( cnt > 0 )
	{
		if( ! IRC_WriteStrClient( Client, RPL_LUSERUNKNOWN_MSG, Client_ID( Client ), cnt )) return DISCONNECTED;
	}

	/* Number of created channels */
	if( ! IRC_WriteStrClient( Client, RPL_LUSERCHANNELS_MSG, Client_ID( Client ), Channel_Count( ))) return DISCONNECTED;

	/* Number of local users, services and servers */
	if( ! IRC_WriteStrClient( Client, RPL_LUSERME_MSG, Client_ID( Client ), Client_MyUserCount( ), Client_MyServiceCount( ), Client_MyServerCount( ))) return DISCONNECTED;

#ifndef STRICT_RFC
	/* Maximum number of local users */
	cnt = Client_MyUserCount();
	max = Client_MyMaxUserCount();
	if (! IRC_WriteStrClient(Client, RPL_LOCALUSERS_MSG, Client_ID(Client),
			cnt, max, cnt, max))
		return DISCONNECTED;
	/* Maximum number of users in the network */
	cnt = Client_UserCount();
	max = Client_MaxUserCount();
	if(! IRC_WriteStrClient(Client, RPL_NETUSERS_MSG, Client_ID(Client),
			cnt, max, cnt, max))
		return DISCONNECTED;
#endif
	
	return CONNECTED;
} /* IRC_Send_LUSERS */


static bool
Show_MOTD_Start(CLIENT *Client)
{
	return IRC_WriteStrClient(Client, RPL_MOTDSTART_MSG,
		Client_ID( Client ), Client_ID( Client_ThisServer( )));
}

static bool
Show_MOTD_Sendline(CLIENT *Client, const char *msg)
{
	return IRC_WriteStrClient(Client, RPL_MOTD_MSG, Client_ID( Client ), msg);
}

static bool
Show_MOTD_End(CLIENT *Client)
{
	return IRC_WriteStrClient( Client, RPL_ENDOFMOTD_MSG, Client_ID( Client ));
}


GLOBAL bool
IRC_Show_MOTD( CLIENT *Client )
{
	char line[127];
	FILE *fd;

	assert( Client != NULL );

	if (Conf_MotdPhrase[0]) {
		if (!Show_MOTD_Start(Client))
			return DISCONNECTED;
		if (!Show_MOTD_Sendline(Client, Conf_MotdPhrase))
			return DISCONNECTED;

		return Show_MOTD_End(Client);
	}

	fd = fopen( Conf_MotdFile, "r" );
	if( ! fd ) {
		Log( LOG_WARNING, "Can't read MOTD file \"%s\": %s", Conf_MotdFile, strerror( errno ));
		return IRC_WriteStrClient( Client, ERR_NOMOTD_MSG, Client_ID( Client ) );
	}

	if (!Show_MOTD_Start( Client )) {
		fclose(fd);
		return false;
	}

	while (fgets( line, (int)sizeof line, fd )) {
		ngt_TrimLastChr( line, '\n');

		if( ! Show_MOTD_Sendline( Client, line)) {
			fclose( fd );
			return false;
		}
	}
	fclose(fd);
	return Show_MOTD_End(Client);
} /* IRC_Show_MOTD */


GLOBAL bool
IRC_Send_NAMES( CLIENT *Client, CHANNEL *Chan )
{
	bool is_visible, is_member;
	char str[LINE_LEN + 1];
	CL2CHAN *cl2chan;
	CLIENT *cl;

	assert( Client != NULL );
	assert( Chan != NULL );

	if( Channel_IsMemberOf( Chan, Client )) is_member = true;
	else is_member = false;

	/* Secret channel? */
	if( ! is_member && strchr( Channel_Modes( Chan ), 's' )) return CONNECTED;

	/* Alle Mitglieder suchen */
	snprintf( str, sizeof( str ), RPL_NAMREPLY_MSG, Client_ID( Client ), "=", Channel_Name( Chan ));
	cl2chan = Channel_FirstMember( Chan );
	while( cl2chan )
	{
		cl = Channel_GetClient( cl2chan );

		if( strchr( Client_Modes( cl ), 'i' )) is_visible = false;
		else is_visible = true;

		if( is_member || is_visible )
		{
			/* Nick anhaengen */
			if( str[strlen( str ) - 1] != ':' ) strlcat( str, " ", sizeof( str ));
			if( strchr( Channel_UserModes( Chan, cl ), 'o' )) strlcat( str, "@", sizeof( str ));
			else if( strchr( Channel_UserModes( Chan, cl ), 'v' )) strlcat( str, "+", sizeof( str ));
			strlcat( str, Client_ID( cl ), sizeof( str ));

			if( strlen( str ) > ( LINE_LEN - CLIENT_NICK_LEN - 4 ))
			{
				/* Zeile wird zu lang: senden! */
				if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
				snprintf( str, sizeof( str ), RPL_NAMREPLY_MSG, Client_ID( Client ), "=", Channel_Name( Chan ));
			}
		}

		/* naechstes Mitglied suchen */
		cl2chan = Channel_NextMember( Chan, cl2chan );
	}
	if( str[strlen( str ) - 1] != ':')
	{
		/* Es sind noch Daten da, die gesendet werden muessen */
		if( ! IRC_WriteStrClient( Client, "%s", str )) return DISCONNECTED;
	}

	return CONNECTED;
} /* IRC_Send_NAMES */



/**
 * Send the ISUPPORT numeric (005).
 * This numeric indicates the features that are supported by this server.
 * See <http://www.irc.org/tech_docs/005.html> for details.
 */
GLOBAL bool
IRC_Send_ISUPPORT PARAMS((CLIENT * Client))
{
	if (!IRC_WriteStrClient(Client, RPL_ISUPPORT1_MSG, Client_ID(Client),
				Conf_MaxJoins))
		return DISCONNECTED;
	return IRC_WriteStrClient(Client, RPL_ISUPPORT2_MSG, Client_ID(Client),
				  CHANNEL_NAME_LEN - 1, Conf_MaxNickLength - 1,
				  COMMAND_LEN - 23, CLIENT_AWAY_LEN - 1,
				  COMMAND_LEN - 113);
} /* IRC_Send_ISUPPORT */


/* -eof- */