ngircd-tor/src/ngircd/irc-mode.c

/*
 * ngIRCd -- The Next Generation IRC Daemon
 * Copyright (c)2001-2005 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 commands for mode changes (MODE, AWAY, ...)
 */


#include "portab.h"

static char UNUSED id[] = "$Id: irc-mode.c,v 1.52 2008/02/24 18:44:41 fw Exp $";

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

#include "defines.h"
#include "conn.h"
#include "client.h"
#include "channel.h"
#include "irc-write.h"
#include "lists.h"
#include "log.h"
#include "parse.h"
#include "messages.h"
#include "resolve.h"
#include "conf.h"

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


static bool Client_Mode PARAMS(( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target ));
static bool Channel_Mode PARAMS(( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel ));

static bool Add_Invite PARAMS(( CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, char *Pattern ));
static bool Add_Ban PARAMS(( CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, char *Pattern ));

static bool Del_Invite PARAMS(( CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, char *Pattern ));
static bool Del_Ban PARAMS(( CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, char *Pattern ));

static bool Send_ListChange PARAMS(( char *Mode, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, char *Mask ));


GLOBAL bool
IRC_MODE( CLIENT *Client, REQUEST *Req )
{
	CLIENT *cl, *origin;
	CHANNEL *chan;

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

	/* No parameters? */
	if( Req->argc < 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );

	/* Origin for answers */
	if( Client_Type( Client ) == CLIENT_SERVER )
	{
		origin = Client_Search( Req->prefix );
		if( ! origin ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
	}
	else origin = Client;

	/* Channel or user mode? */
	cl = NULL; chan = NULL;
	if (Client_IsValidNick(Req->argv[0]))
		cl = Client_Search(Req->argv[0]);
	if (Channel_IsValidName(Req->argv[0]))
		chan = Channel_Search(Req->argv[0]);

	if (cl)
		return Client_Mode(Client, Req, origin, cl);
	if (chan)
		return Channel_Mode(Client, Req, origin, chan);

	/* No target found! */
	return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG,
			Client_ID(Client), Req->argv[0]);
} /* IRC_MODE */


static bool
Client_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CLIENT *Target )
{
	/* Handle client mode requests */

	char the_modes[COMMAND_LEN], x[2], *mode_ptr;
	bool ok, set;
	int mode_arg;
	size_t len;

	/* Is the client allowed to request or change the modes? */
	if( Client_Type( Client ) == CLIENT_USER )
	{
		/* Users are only allowed to manipulate their own modes! */
		if( Target != Client ) return IRC_WriteStrClient( Client, ERR_USERSDONTMATCH_MSG, Client_ID( Client ));
	}

	/* Mode request: let's answer it :-) */
	if( Req->argc == 1 ) return IRC_WriteStrClient( Origin, RPL_UMODEIS_MSG, Client_ID( Origin ), Client_Modes( Target ));

	mode_arg = 1;
	mode_ptr = Req->argv[mode_arg];

	/* Initial state: set or unset modes? */
	if( *mode_ptr == '+' ) set = true;
	else if( *mode_ptr == '-' ) set = false;
	else return IRC_WriteStrClient( Origin, ERR_UMODEUNKNOWNFLAG_MSG, Client_ID( Origin ));

	/* Prepare reply string */
	if( set ) strcpy( the_modes, "+" );
	else strcpy( the_modes, "-" );

	x[1] = '\0';
	ok = CONNECTED;
	while( mode_ptr )
	{
		mode_ptr++;
		if( ! *mode_ptr )
		{
			/* Try next argument if there's any */
			mode_arg++;
			if( mode_arg < Req->argc ) mode_ptr = Req->argv[mode_arg];
			else break;
		}
		
		switch( *mode_ptr )
		{
			case '+':
			case '-':
				if((( *mode_ptr == '+' ) && ( ! set )) || (( *mode_ptr == '-' ) && ( set )))
				{
					/* Action modifier ("+"/"-") must be changed ... */
					len = strlen( the_modes ) - 1;
					if(( the_modes[len] == '+' ) || ( the_modes[len] == '-' ))
					{
						/* Adjust last action modifier in result */
						the_modes[len] = *mode_ptr;
					}
					else
					{
						/* Append modifier character to result string */
						x[0] = *mode_ptr;
						strlcat( the_modes, x, sizeof( the_modes ));
					}
					if( *mode_ptr == '+' ) set = true;
					else set = false;
				}
				continue;
		}
		
		/* Validate modes */
		x[0] = '\0';
		switch( *mode_ptr )
		{
			case 'i': /* Invisible */
			case 's': /* Server messages */
			case 'w': /* Wallops messages */
				x[0] = *mode_ptr;
				break;

			case 'a': /* Away */
				if( Client_Type( Client ) == CLIENT_SERVER )
				{
					x[0] = 'a';
					Client_SetAway( Origin, DEFAULT_AWAY_MSG );
				}
				else ok = IRC_WriteStrClient( Origin, ERR_NOPRIVILEGES_MSG, Client_ID( Origin ));
				break;

			case 'o': /* IRC operator (only unsettable!) */
				if(( ! set ) || ( Client_Type( Client ) == CLIENT_SERVER ))
				{
					Client_SetOperByMe( Target, false );
					x[0] = 'o';
				}
				else ok = IRC_WriteStrClient( Origin, ERR_NOPRIVILEGES_MSG, Client_ID( Origin ));
				break;

			case 'r': /* Restricted (only settable) */
				if(( set ) || ( Client_Type( Client ) == CLIENT_SERVER )) x[0] = 'r';
				else ok = IRC_WriteStrClient( Origin, ERR_RESTRICTED_MSG, Client_ID( Origin ));
				break;

			default:
				Log( LOG_DEBUG, "Unknown mode \"%c%c\" from \"%s\"!?", set ? '+' : '-', *mode_ptr, Client_ID( Origin ));
				if( Client_Type( Client ) != CLIENT_SERVER ) ok = IRC_WriteStrClient( Origin, ERR_UMODEUNKNOWNFLAG2_MSG, Client_ID( Origin ), set ? '+' : '-', *mode_ptr );
				x[0] = '\0';
				goto client_exit;
		}
		if( ! ok ) break;

		/* Is there a valid mode change? */
		if( ! x[0] ) continue;

		if( set )
		{
			/* Set mode */
			if( Client_ModeAdd( Target, x[0] )) strlcat( the_modes, x, sizeof( the_modes ));

		}
		else
		{
			/* Unset mode */
			if( Client_ModeDel( Target, x[0] )) strlcat( the_modes, x, sizeof( the_modes ));
		}		
	}
client_exit:
	
	/* Are there changed modes? */
	if( the_modes[1] )
	{
		/* Remoce needless action modifier characters */
		len = strlen( the_modes ) - 1;
		if(( the_modes[len] == '+' ) || ( the_modes[len] == '-' )) the_modes[len] = '\0';

		if( Client_Type( Client ) == CLIENT_SERVER )
		{
			/* Forward modes to other servers */
			IRC_WriteStrServersPrefix( Client, Origin, "MODE %s :%s", Client_ID( Target ), the_modes );
		}
		else
		{
			/* Send reply to client and inform other servers */
			ok = IRC_WriteStrClientPrefix( Client, Origin, "MODE %s :%s", Client_ID( Target ), the_modes );
			IRC_WriteStrServersPrefix( Client, Origin, "MODE %s :%s", Client_ID( Target ), the_modes );
		}
		Log( LOG_DEBUG, "User \"%s\": Mode change, now \"%s\".", Client_Mask( Target ), Client_Modes( Target ));
	}
	
	IRC_SetPenalty( Client, 1 );	
	return ok;
} /* Client_Mode */


static bool
Channel_Mode_Answer_Request(CLIENT *Origin, CHANNEL *Channel)
{
	char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], argadd[CLIENT_PASS_LEN];
	const char *mode_ptr;

	/* Member or not? -- That's the question! */
	if (!Channel_IsMemberOf(Channel, Origin))
		return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
			Client_ID(Origin), Channel_Name(Channel), Channel_Modes(Channel));

	/* The sender is a member: generate extended reply */
	strlcpy(the_modes, Channel_Modes(Channel), sizeof(the_modes));
	mode_ptr = the_modes;
	the_args[0] = '\0';

	while(*mode_ptr) {
		switch(*mode_ptr) {
		case 'l':
			snprintf(argadd, sizeof(argadd), " %lu", Channel_MaxUsers(Channel));
			strlcat(the_args, argadd, sizeof(the_args));
			break;
		case 'k':
			strlcat(the_args, " ", sizeof(the_args));
			strlcat(the_args, Channel_Key(Channel), sizeof(the_args));
			break;
		}
		mode_ptr++;
	}
	if (the_args[0])
		strlcat(the_modes, the_args, sizeof(the_modes));

	return IRC_WriteStrClient(Origin, RPL_CHANNELMODEIS_MSG,
		Client_ID(Origin), Channel_Name(Channel), the_modes);
}


static bool
Channel_Mode( CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel )
{
	/* Handle channel and channel-user modes */

	char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2], argadd[CLIENT_PASS_LEN], *mode_ptr;
	bool ok, set, modeok = true, skiponce, use_servermode = false;
	int mode_arg, arg_arg;
	CLIENT *client;
	long l;
	size_t len;

	/* Mode request: let's answer it :-) */
	if (Req->argc <= 1)
		return Channel_Mode_Answer_Request(Origin, Channel);

	/* Is the user allowed to change modes? */
	if (Client_Type(Client) == CLIENT_USER) {
		/* Is the originating user on that channel? */
		if (!Channel_IsMemberOf(Channel, Origin))
			return IRC_WriteStrClient(Origin, ERR_NOTONCHANNEL_MSG,
				Client_ID(Origin), Channel_Name(Channel));
		modeok = false;
		/* channel operator? */
		if (strchr(Channel_UserModes(Channel, Origin), 'o'))
			modeok = true;
		else if(Conf_OperCanMode) {
			/* IRC-Operators can use MODE as well */
			if (Client_OperByMe(Origin)) {
				modeok = true;
				if (Conf_OperServerMode)
					use_servermode = true; /* Change Origin to Server */
			}
		}
	}

	mode_arg = 1;
	mode_ptr = Req->argv[mode_arg];
	if (Req->argc > mode_arg + 1)
		arg_arg = mode_arg + 1;
	else
		arg_arg = -1;

	/* Initial state: set or unset modes? */
	skiponce = false;
	switch (*mode_ptr) {
	case '-': set = false; break;
	case '+': set = true; break;
	default:
		set = true;
		skiponce = true;
	}

	/* Prepare reply string */
	strcpy(the_modes, set ? "+" : "-");
	the_args[0] = '\0';

	x[1] = '\0';
	ok = CONNECTED;
	while (mode_ptr) {
		if (! skiponce)
			mode_ptr++;
		if (!*mode_ptr) {
			/* Try next argument if there's any */
			if (arg_arg > mode_arg)
				mode_arg = arg_arg;
			else
				mode_arg++;

			if (mode_arg >= Req->argc)
				break;
			mode_ptr = Req->argv[mode_arg];

			if (Req->argc > mode_arg + 1)
				arg_arg = mode_arg + 1;
			else
				arg_arg = -1;
		}
		skiponce = false;

		switch (*mode_ptr) {
		case '+':
		case '-':
			if (((*mode_ptr == '+') && !set) || ((*mode_ptr == '-') && set)) {
				/* Action modifier ("+"/"-") must be changed ... */
				len = strlen( the_modes ) - 1;
				if ((the_modes[len] == '+') || (the_modes[len] == '-')) {
					/* Adjust last action modifier in result */
					the_modes[len] = *mode_ptr;
				} else {
					/* Append modifier character to result string */
					x[0] = *mode_ptr;
					strlcat(the_modes, x, sizeof(the_modes));
				}
				set = *mode_ptr == '+';
			}
			continue;
		}

		/* Are there arguments left? */
		if( arg_arg >= Req->argc ) arg_arg = -1;

		/* Validate modes */
		x[0] = '\0';
		argadd[0] = '\0';
		client = NULL;
		switch( *mode_ptr )
		{
			/* --- Channel modes --- */

			case 'i': /* Invite only */
			case 'm': /* Moderated */
			case 'n': /* Only members can write */
			case 's': /* Secret channel */
			case 't': /* Topic locked */
				if( modeok ) x[0] = *mode_ptr;
				else ok = IRC_WriteStrClient( Origin, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( Origin ), Channel_Name( Channel ));
				break;

			case 'k': /* Channel key */
				if( ! set )
				{
					if( modeok ) x[0] = *mode_ptr;
					else ok = IRC_WriteStrClient( Origin, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( Origin ), Channel_Name( Channel ));
					break;
				}
				if( arg_arg > mode_arg )
				{
					if( modeok )
					{
						Channel_ModeDel( Channel, 'k' );
						Channel_SetKey( Channel, Req->argv[arg_arg] );
						strlcpy( argadd, Channel_Key( Channel ), sizeof( argadd ));
						x[0] = *mode_ptr;
					}
					else ok = IRC_WriteStrClient( Origin, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( Origin ), Channel_Name( Channel ));
					Req->argv[arg_arg][0] = '\0';
					arg_arg++;
				}
				else ok = IRC_WriteStrClient( Origin, ERR_NEEDMOREPARAMS_MSG, Client_ID( Origin ), Req->command );
				break;

			case 'l': /* Member limit */
				if( ! set )
				{
					if( modeok ) x[0] = *mode_ptr;
					else ok = IRC_WriteStrClient( Origin, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( Origin ), Channel_Name( Channel ));
					break;
				}
				if( arg_arg > mode_arg )
				{
					if( modeok )
					{
						l = atol( Req->argv[arg_arg] );
						if( l > 0 && l < 0xFFFF )
						{
							Channel_ModeDel( Channel, 'l' );
							Channel_SetMaxUsers( Channel, l );
							snprintf( argadd, sizeof( argadd ), "%ld", l );
							x[0] = *mode_ptr;
						}
					}
					else ok = IRC_WriteStrClient( Origin, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( Origin ), Channel_Name( Channel ));
					Req->argv[arg_arg][0] = '\0';
					arg_arg++;
				}
				else ok = IRC_WriteStrClient( Origin, ERR_NEEDMOREPARAMS_MSG, Client_ID( Origin ), Req->command );
				break;

			case 'P': /* Persistent channel */
				if (modeok) {
					/* Only IRC operators are allowed to
					 * set the 'P' channel mode! */
					if (set && ! (Client_OperByMe(Client)
					    || Client_Type(Client) == CLIENT_SERVER)) {
						ok = IRC_WriteStrClient(Origin,
							ERR_NOPRIVILEGES_MSG,
							Client_ID(Origin));
					} else
						x[0] = 'P';
				} else
					ok = IRC_WriteStrClient(Origin,
						ERR_CHANOPRIVSNEEDED_MSG,
						Client_ID(Origin),
						Channel_Name(Channel));
				break;

			/* --- Channel user modes --- */

			case 'o': /* Channel operator */
			case 'v': /* Voice */
				if( arg_arg > mode_arg )
				{
					if( modeok )
					{
						client = Client_Search( Req->argv[arg_arg] );
						if( client ) x[0] = *mode_ptr;
						else ok = IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->argv[arg_arg] );
					}
					else ok = IRC_WriteStrClient( Origin, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( Origin ), Channel_Name( Channel ));
					Req->argv[arg_arg][0] = '\0';
					arg_arg++;
				}
				else ok = IRC_WriteStrClient( Origin, ERR_NEEDMOREPARAMS_MSG, Client_ID( Origin ), Req->command );
				break;

			/* --- Channel lists --- */

			case 'I': /* Invite lists */
				if( arg_arg > mode_arg )
				{
					/* modify list */
					if( modeok )
					{
						if( set ) Add_Invite( Origin, Client, Channel, Req->argv[arg_arg] );
						else Del_Invite( Origin, Client, Channel, Req->argv[arg_arg] );
					}
					else ok = IRC_WriteStrClient( Origin, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( Origin ), Channel_Name( Channel ));
					Req->argv[arg_arg][0] = '\0';
					arg_arg++;
				}
				else Channel_ShowInvites( Origin, Channel );
				break;

			case 'b': /* Ban lists */
				if( arg_arg > mode_arg )
				{
					/* modify list */
					if( modeok )
					{
						if( set ) Add_Ban( Origin, Client, Channel, Req->argv[arg_arg] );
						else Del_Ban( Origin, Client, Channel, Req->argv[arg_arg] );
					}
					else ok = IRC_WriteStrClient( Origin, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( Origin ), Channel_Name( Channel ));
					Req->argv[arg_arg][0] = '\0';
					arg_arg++;
				}
				else Channel_ShowBans( Origin, Channel );
				break;

			default:
				Log( LOG_DEBUG, "Unknown mode \"%c%c\" from \"%s\" on %s!?", set ? '+' : '-', *mode_ptr, Client_ID( Origin ), Channel_Name( Channel ));
				if( Client_Type( Client ) != CLIENT_SERVER ) ok = IRC_WriteStrClient( Origin, ERR_UMODEUNKNOWNFLAG2_MSG, Client_ID( Origin ), set ? '+' : '-', *mode_ptr );
				x[0] = '\0';
				goto chan_exit;
		}
		if( ! ok ) break;

		/* Is there a valid mode change? */
		if( ! x[0] ) continue;

		/* Validate target client */
		if( client && ( ! Channel_IsMemberOf( Channel, client )))
		{
			if( ! IRC_WriteStrClient( Origin, ERR_USERNOTINCHANNEL_MSG, Client_ID( Origin ), Client_ID( client ), Channel_Name( Channel ))) break;
			continue;
		}

		if( set )
		{
			/* Set mode */
			if( client )
			{
				/* Channel-User-Mode */
				if( Channel_UserModeAdd( Channel, client, x[0] ))
				{
					strlcat( the_args, " ", sizeof( the_args ));
					strlcat( the_args, Client_ID( client ), sizeof( the_args ));
					strlcat( the_modes, x, sizeof( the_modes ));
					Log( LOG_DEBUG, "User \"%s\": Mode change on %s, now \"%s\"", Client_Mask( client ), Channel_Name( Channel ), Channel_UserModes( Channel, client ));
				}
			}
			else
			{
				/* Channel-Mode */
				if( Channel_ModeAdd( Channel, x[0] ))
				{
					strlcat( the_modes, x, sizeof( the_modes ));
					Log( LOG_DEBUG, "Channel %s: Mode change, now \"%s\".", Channel_Name( Channel ), Channel_Modes( Channel ));
				}
			}
		}
		else
		{
			/* Unset mode */
			if( client )
			{
				/* Channel-User-Mode */
				if( Channel_UserModeDel( Channel, client, x[0] ))
				{
					strlcat( the_args, " ", sizeof( the_args ));
					strlcat( the_args, Client_ID( client ), sizeof( the_args ));
					strlcat( the_modes, x, sizeof( the_modes ));
					Log( LOG_DEBUG, "User \"%s\": Mode change on %s, now \"%s\"", Client_Mask( client ), Channel_Name( Channel ), Channel_UserModes( Channel, client ));
				}
			}
			else
			{
				/* Channel-Mode */
				if( Channel_ModeDel( Channel, x[0] ))
				{
					strlcat( the_modes, x, sizeof( the_modes ));
					Log( LOG_DEBUG, "Channel %s: Mode change, now \"%s\".", Channel_Name( Channel ), Channel_Modes( Channel ));
				}
			}
		}

		/* Are there additional arguments to add? */
		if( argadd[0] )
		{
			strlcat( the_args, " ", sizeof( the_args ));
			strlcat( the_args, argadd, sizeof( the_args ));
		}
	}
chan_exit:

	/* Are there changed modes? */
	if (the_modes[1]) {
		/* Clean up mode string */
		len = strlen(the_modes) - 1;
		if ((the_modes[len] == '+') || (the_modes[len] == '-'))
			the_modes[len] = '\0';

		if (Client_Type(Client) == CLIENT_SERVER) {
			/* Forward mode changes to channel users and other servers */
			IRC_WriteStrServersPrefix(Client, Origin, "MODE %s %s%s", Channel_Name( Channel ), the_modes, the_args);
			IRC_WriteStrChannelPrefix(Client, Channel, Origin, false, "MODE %s %s%s", Channel_Name( Channel ), the_modes, the_args);
		} else {
			if (use_servermode)
				Origin = Client_ThisServer();
			/* Send reply to client and inform other servers and channel users */
			ok = IRC_WriteStrClientPrefix( Client, Origin, "MODE %s %s%s", Channel_Name( Channel ), the_modes, the_args );
			IRC_WriteStrServersPrefix( Client, Origin, "MODE %s %s%s", Channel_Name( Channel ), the_modes, the_args );
			IRC_WriteStrChannelPrefix( Client, Channel, Origin, false, "MODE %s %s%s", Channel_Name( Channel ), the_modes, the_args );
		}
	}

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


GLOBAL bool
IRC_AWAY( CLIENT *Client, REQUEST *Req )
{
	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 == 1 ) && (Req->argv[0][0] ))
	{
		/* AWAY setzen */
		Client_SetAway( Client, Req->argv[0] );
		Client_ModeAdd( Client, 'a' );
		IRC_WriteStrServersPrefix( Client, Client, "MODE %s :+a", Client_ID( Client ));
		return IRC_WriteStrClient( Client, RPL_NOWAWAY_MSG, Client_ID( Client ));
	}
	else
	{
		/* AWAY loeschen */
		Client_ModeDel( Client, 'a' );
		IRC_WriteStrServersPrefix( Client, Client, "MODE %s :-a", Client_ID( Client ));
		return IRC_WriteStrClient( Client, RPL_UNAWAY_MSG, Client_ID( Client ));
	}
} /* IRC_AWAY */


static bool
Add_Invite( CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, char *Pattern )
{
	char *mask;
	bool already;

	assert( Client != NULL );
	assert( Channel != NULL );
	assert( Pattern != NULL );

	mask = Lists_MakeMask( Pattern );

	already = Lists_CheckDupeMask(Channel_GetListInvites(Channel), mask );
	if (!already) {
		if( ! Channel_AddInvite(Channel, mask, false ))
			return CONNECTED;
	}
	if ( already && ( Client_Type( Prefix ) == CLIENT_SERVER ))
		return CONNECTED;

	return Send_ListChange( "+I", Prefix, Client, Channel, mask );
} /* Add_Invite */


static bool
Add_Ban( CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, char *Pattern )
{
	char *mask;
	bool already;

	assert( Client != NULL );
	assert( Channel != NULL );
	assert( Pattern != NULL );

	mask = Lists_MakeMask( Pattern );

	already = Lists_CheckDupeMask(Channel_GetListBans(Channel), mask );
	if (!already) {
		if( ! Channel_AddBan(Channel, mask))
			return CONNECTED;
	}
	if ( already && ( Client_Type( Prefix ) == CLIENT_SERVER ))
		return CONNECTED;

	return Send_ListChange( "+b", Prefix, Client, Channel, mask );
} /* Add_Ban */


static bool
Del_Invite( CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, char *Pattern )
{
	char *mask;

	assert( Client != NULL );
	assert( Channel != NULL );
	assert( Pattern != NULL );

	mask = Lists_MakeMask( Pattern );
	Lists_Del(Channel_GetListInvites(Channel), mask);
	return Send_ListChange( "-I", Prefix, Client, Channel, mask );
} /* Del_Invite */


static bool
Del_Ban( CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, char *Pattern )
{
	char *mask;

	assert( Client != NULL );
	assert( Channel != NULL );
	assert( Pattern != NULL );

	mask = Lists_MakeMask( Pattern );
	Lists_Del(Channel_GetListBans(Channel), mask);
	return Send_ListChange( "-b", Prefix, Client, Channel, mask );
} /* Del_Ban */


static bool
Send_ListChange( char *Mode, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, char *Mask )
{
	/* Bestaetigung an Client schicken & andere Server sowie Channel-User informieren */

	bool ok;

	if( Client_Type( Client ) == CLIENT_USER )
	{
		/* Bestaetigung an Client */
		ok = IRC_WriteStrClientPrefix( Client, Prefix, "MODE %s %s %s", Channel_Name( Channel ), Mode, Mask );
	}
	else ok = true;

	/* an andere Server */
	IRC_WriteStrServersPrefix( Client, Prefix, "MODE %s %s %s", Channel_Name( Channel ), Mode, Mask );

	/* und lokale User im Channel */
	IRC_WriteStrChannelPrefix( Client, Channel, Prefix, false, "MODE %s %s %s", Channel_Name( Channel ), Mode, Mask );
	
	return ok;
} /* Send_ListChange */


/* -eof- */