X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=ngircd-alex.git;a=blobdiff_plain;f=src%2Fngircd%2Firc-channel.c;h=3bf02c67893ee551c6c2b7ebe08d846044881d05;hp=23f1bf91a9b399a1f5f7880a32b37da2457f3a56;hb=a988bbc86aed404b7bcfdbceafc030ea4bc5ecab;hpb=1e59617d2c70ebc4e5008a4233cc759fee715c8f

diff --git a/src/ngircd/irc-channel.c b/src/ngircd/irc-channel.c
index 23f1bf91..3bf02c67 100644
--- a/src/ngircd/irc-channel.c
+++ b/src/ngircd/irc-channel.c
@@ -1,17 +1,14 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2010 Alexander Barton (alex@barton.de)
  *
- * Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
- * der GNU General Public License (GPL), wie von der Free Software Foundation
- * herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
- * der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
- * Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
- * der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
+ * 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.
  *
- * $Id: irc-channel.c,v 1.16 2002/11/30 15:04:57 alex Exp $
- *
- * irc-channel.c: IRC-Channel-Befehle
+ * IRC channel commands
  */
 
 
@@ -19,212 +16,404 @@
 
 #include "imp.h"
 #include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
 #include <string.h>
 
 #include "defines.h"
 #include "conn.h"
-#include "client.h"
 #include "channel.h"
+#include "conn-func.h"
 #include "lists.h"
 #include "log.h"
 #include "match.h"
 #include "messages.h"
 #include "parse.h"
-#include "irc.h"
+#include "irc-info.h"
 #include "irc-write.h"
+#include "conf.h"
 
 #include "exp.h"
 #include "irc-channel.h"
 
 
-GLOBAL BOOLEAN
-IRC_JOIN( CLIENT *Client, REQUEST *Req )
+/*
+ * RFC 2812, (3.2.1 Join message Command):
+ *  Note that this message
+ *  accepts a special argument ("0"), which is a special request to leave all
+ *  channels the user is currently a member of. The server will process this
+ *  message as if the user had sent a PART command (See Section 3.2.2) for
+ *  each channel he is a member of.
+ */
+static bool
+part_from_all_channels(CLIENT* client, CLIENT *target)
 {
-	CHAR *channame, *flags, *topic, modes[8];
-	BOOLEAN is_new_chan, is_invited, is_banned;
-	CLIENT *target;
+	CL2CHAN *cl2chan;
 	CHANNEL *chan;
 
-	assert( Client != NULL );
-	assert( Req != NULL );
+	while ((cl2chan = Channel_FirstChannelOf(target))) {
+		chan = Channel_GetChannel(cl2chan);
+		assert( chan != NULL );
+		Channel_Part(target, client, Channel_Name(chan), Client_ID(target));
+	}
+	return CONNECTED;
+}
 
-	/* Falsche Anzahl Parameter? */
-	if(( Req->argc > 1 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
 
-	/* 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 );
+/**
+ * Check weather a local client is allowed to join an already existing
+ * channel or not.
+ * @param Client Client that sent the JOIN command
+ * @param chan Channel to check
+ * @param channame Name of the channel
+ * @param key Provided channel key (or NULL if none has been provided)
+ * @return true if client is allowed to join channel, false otherwise
+ */
+static bool
+join_allowed(CLIENT *Client, CHANNEL *chan, const char *channame,
+	     const char *key)
+{
+	bool is_invited, is_banned;
+	const char *channel_modes;
 
-	/* Channel-Namen durchgehen */
-	chan = NULL;
-	channame = strtok( Req->argv[0], "," );
-	while( channame )
-	{
-		chan = flags = NULL;
+	/* Allow IRC operators to overwrite channel limits */
+	if (strchr(Client_Modes(Client), 'o'))
+		return true;
 
-		/* wird der Channel neu angelegt? */
-		if( Channel_Search( channame )) is_new_chan = FALSE;
-		else is_new_chan = TRUE;
+	is_banned = Lists_Check(Channel_GetListBans(chan), Client);
+	is_invited = Lists_Check(Channel_GetListInvites(chan), Client);
 
-		/* Hat ein Server Channel-User-Modes uebergeben? */
-		if( Client_Type( Client ) == CLIENT_SERVER )
-		{
-			/* Channel-Flags extrahieren */
-			flags = strchr( channame, 0x7 );
-			if( flags )
-			{
-				*flags = '\0';
-				flags++;
-			}
-		}
-
-		/* Lokaler Client? */
-		if( Client_Type( Client ) == CLIENT_USER )
-		{
-			/* Existiert der Channel bereits, oder wird er im Moment neu erzeugt? */
-			if( is_new_chan )
-			{
-				/* Erster User im Channel: Operator-Flag setzen */
-				flags = "o";
-			}
-			else
-			{
-				/* Existierenden Channel suchen */
-				chan = Channel_Search( channame );
-				assert( chan != NULL );
+	if (is_banned && !is_invited) {
+		/* Client is banned from channel (and not on invite list) */
+		IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG,
+				   Client_ID(Client), channame);
+		return false;
+	}
 
-				is_banned = Lists_CheckBanned( target, chan );
-				is_invited = Lists_CheckInvited( target, chan );
+	channel_modes = Channel_Modes(chan);
+	if (strchr(channel_modes, 'i') && !is_invited) {
+		/* Channel is "invite-only" and client is not on invite list */
+		IRC_WriteStrClient(Client, ERR_INVITEONLYCHAN_MSG,
+				   Client_ID(Client), channame);
+		return false;
+	}
 
-				/* Testen, ob Client gebanned ist */
-				if(( is_banned == TRUE ) &&  ( is_invited == FALSE ))
-				{
-					/* Client ist gebanned (und nicht invited): */
-					IRC_WriteStrClient( Client, ERR_BANNEDFROMCHAN_MSG, Client_ID( Client ), channame );
+	if (!Channel_CheckKey(chan, Client, key ? key : "")) {
+		/* Channel is protected by a channel key and the client
+		 * didn't specify the correct one */
+		IRC_WriteStrClient(Client, ERR_BADCHANNELKEY_MSG,
+				   Client_ID(Client), channame);
+		return false;
+	}
 
-					/* naechsten Namen ermitteln */
-					channame = strtok( NULL, "," );
-					continue;
-				}
+	if (strchr(channel_modes, 'l') &&
+	    (Channel_MaxUsers(chan) <= Channel_MemberCount(chan))) {
+		/* There are more clints joined to this channel than allowed */
+		IRC_WriteStrClient(Client, ERR_CHANNELISFULL_MSG,
+				   Client_ID(Client), channame);
+		return false;
+	}
 
-				/* Ist der Channel "invite-only"? */
-				if(( strchr( Channel_Modes( chan ), 'i' ) != NULL ) && ( is_invited == FALSE ))
-				{
-					/* Channel ist "invite-only" und Client wurde nicht invited: */
-					IRC_WriteStrClient( Client, ERR_INVITEONLYCHAN_MSG, Client_ID( Client ), channame );
+	if (strchr(channel_modes, 'z') && !Conn_UsesSSL(Client_Conn(Client))) {
+		/* Only "secure" clients are allowed, but clients doesn't
+		 * use SSL encryption */
+		IRC_WriteStrClient(Client, ERR_SECURECHANNEL_MSG,
+				   Client_ID(Client), channame);
+		return false;
+	}
 
-					/* naechsten Namen ermitteln */
-					channame = strtok( NULL, "," );
-					continue;
-				}
-			}
-		}
+	return true;
+}
 
-		/* Channel joinen (und ggf. anlegen) */
-		if( ! Channel_Join( target, channame ))
-		{
-			/* naechsten Namen ermitteln */
-			channame = strtok( NULL, "," );
-			continue;
-		}
-		if( ! chan ) chan = Channel_Search( channame );
-		assert( chan != NULL );
 
-		/* Modes setzen (wenn vorhanden) */
-		while( flags && *flags )
-		{
-			Channel_UserModeAdd( chan, target, *flags );
+static void
+join_set_channelmodes(CHANNEL *chan, CLIENT *target, const char *flags)
+{
+	if (flags) {
+		while (*flags) {
+			Channel_UserModeAdd(chan, target, *flags);
 			flags++;
 		}
+	}
 
-		/* Wenn persistenter Channel und IRC-Operator: zum Channel-OP machen */
-		if(( strchr( Channel_Modes( chan ), 'P' )) && ( strchr( Client_Modes( target ), 'o' ))) Channel_UserModeAdd( chan, target, 'o' );
+	/* If channel persistent and client is ircop: make client chanop */
+	if (strchr(Channel_Modes(chan), 'P') && strchr(Client_Modes(target), 'o'))
+		Channel_UserModeAdd(chan, target, 'o');
+}
 
-		/* Muessen Modes an andere Server gemeldet werden? */
-		strcpy( &modes[1], Channel_UserModes( chan, target ));
-		if( modes[1] ) modes[0] = 0x7;
-		else modes[0] = '\0';
 
-		/* An andere Server weiterleiten */
-		IRC_WriteStrServersPrefix( Client, target, "JOIN :%s%s", channame, modes );
+static void
+cb_join_forward(CLIENT *To, CLIENT *Prefix, void *Data)
+{
+	CONN_ID conn;
+	char str[COMMAND_LEN], *ptr = NULL;
+
+	strlcpy(str, (char *)Data, sizeof(str));
+	conn = Client_Conn(To);
+
+	if (Conn_Options(conn) & CONN_RFC1459) {
+		/* RFC 1459 compatibility mode, appended modes are NOT
+		 * supported, so strip them off! */
+		ptr = strchr(str, 0x7);
+		if (ptr)
+			*ptr++ = '\0';
+	}
 
-		/* im Channel bekannt machen */
-		IRC_WriteStrChannelPrefix( Client, chan, target, FALSE, "JOIN :%s", channame );
-		if( modes[1] )
-		{
-			/* Modes im Channel bekannt machen */
-			IRC_WriteStrChannelPrefix( Client, chan, target, FALSE, "MODE %s +%s %s", channame, &modes[1], Client_ID( target ));
-		}
+	IRC_WriteStrClientPrefix(To, Prefix, "JOIN %s", str);
+	if (ptr && *ptr)
+		IRC_WriteStrClientPrefix(To, Prefix, "MODE %s +%s %s", str, ptr,
+					 Client_ID(Prefix));
+} /* cb_join_forward */
 
-		if( Client_Type( Client ) == CLIENT_USER )
-		{
-			/* an Client bestaetigen */
-			IRC_WriteStrClientPrefix( Client, target, "JOIN :%s", channame );
 
-			/* Topic an Client schicken */
-			topic = Channel_Topic( chan );
-			if( *topic ) IRC_WriteStrClient( Client, RPL_TOPIC_MSG, Client_ID( Client ), channame, topic );
+static void
+join_forward(CLIENT *Client, CLIENT *target, CHANNEL *chan,
+					const char *channame)
+{
+	char modes[CHANNEL_MODE_LEN], str[COMMAND_LEN];
+
+	strlcpy(&modes[1], Channel_UserModes(chan, target), sizeof(modes) - 1);
+	if (modes[1])
+		modes[0] = 0x7;
+	else
+		modes[0] = '\0';
+
+	/* forward to other servers (if it is not a local channel) */
+	if (!Channel_IsLocal(chan)) {
+		snprintf(str, sizeof(str), "%s%s", channame, modes);
+		IRC_WriteStrServersPrefixFlag_CB(Client, target, '\0',
+						 cb_join_forward, str);
+	}
 
-			/* Mitglieder an Client Melden */
-			IRC_Send_NAMES( Client, chan );
-			IRC_WriteStrClient( Client, RPL_ENDOFNAMES_MSG, Client_ID( Client ), Channel_Name( chan ));
-		}
+	/* tell users in this channel about the new client */
+	IRC_WriteStrChannelPrefix(Client, chan, target, false,
+				  "JOIN :%s",  channame);
 
-		/* naechsten Namen ermitteln */
-		channame = strtok( NULL, "," );
+	/* syncronize channel modes */
+	if (modes[1]) {
+		IRC_WriteStrChannelPrefix(Client, chan, target, false,
+					  "MODE %s +%s %s", channame,
+					  &modes[1], Client_ID(target));
 	}
-	return CONNECTED;
-} /* IRC_JOIN */
+} /* join_forward */
 
 
-GLOBAL BOOLEAN
-IRC_PART( CLIENT *Client, REQUEST *Req )
+static bool
+join_send_topic(CLIENT *Client, CLIENT *target, CHANNEL *chan,
+					const char *channame)
 {
+	const char *topic;
+
+	if (Client_Type(Client) != CLIENT_USER)
+		return true;
+	/* acknowledge join */
+	if (!IRC_WriteStrClientPrefix(Client, target, "JOIN :%s", channame))
+		return false;
+
+	/* Send topic to client, if any */
+	topic = Channel_Topic(chan);
+	assert(topic != NULL);
+	if (*topic) {
+		if (!IRC_WriteStrClient(Client, RPL_TOPIC_MSG,
+			Client_ID(Client), channame, topic))
+				return false;
+#ifndef STRICT_RFC
+		if (!IRC_WriteStrClient(Client, RPL_TOPICSETBY_MSG,
+			Client_ID(Client), channame,
+			Channel_TopicWho(chan),
+			Channel_TopicTime(chan)))
+				return false;
+#endif
+	}
+	/* send list of channel members to client */
+	if (!IRC_Send_NAMES(Client, chan))
+		return false;
+	return IRC_WriteStrClient(Client, RPL_ENDOFNAMES_MSG, Client_ID(Client), Channel_Name(chan));
+}
+
+
+GLOBAL bool
+IRC_JOIN( CLIENT *Client, REQUEST *Req )
+{
+	char *channame, *key = NULL, *flags, *lastkey = NULL, *lastchan = NULL;
 	CLIENT *target;
-	CHAR *chan;
+	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 );
+	/* Bad number of arguments? */
+	if (Req->argc < 1 || Req->argc > 2)
+		return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
+					  Client_ID(Client), Req->command);
 
-	/* 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 );
+	/* Who is the sender? */
+	if (Client_Type(Client) == CLIENT_SERVER)
+		target = Client_Search(Req->prefix);
+	else
+		target = Client;
 
-	/* Channel-Namen durchgehen */
-	chan = strtok( Req->argv[0], "," );
-	while( chan )
-	{
-		if( ! Channel_Part( target, Client, chan, Req->argc > 1 ? Req->argv[1] : Client_ID( target )))
-		{
-			/* naechsten Namen ermitteln */
-			chan = strtok( NULL, "," );
-			continue;
+	if (!target)
+		return IRC_WriteStrClient(Client, ERR_NOSUCHNICK_MSG, Client_ID(Client), Req->prefix);
+
+	/* Is argument "0"? */
+	if (Req->argc == 1 && !strncmp("0", Req->argv[0], 2))
+		return part_from_all_channels(Client, target);
+
+	/* Are channel keys given? */
+	if (Req->argc > 1)
+		key = strtok_r(Req->argv[1], ",", &lastkey);
+
+	channame = Req->argv[0];
+	channame = strtok_r(channame, ",", &lastchan);
+
+	/* Make sure that "channame" is not the empty string ("JOIN :") */
+	if (! channame)
+		return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
+					  Client_ID(Client), Req->command);
+
+	while (channame) {
+		flags = NULL;
+
+		/* Did the server include channel-user-modes? */
+		if (Client_Type(Client) == CLIENT_SERVER) {
+			flags = strchr(channame, 0x7);
+			if (flags) {
+				*flags = '\0';
+				flags++;
+			}
+		}
+
+		chan = Channel_Search(channame);
+		if (!chan && Conf_PredefChannelsOnly) {
+			 /* channel must be created, but server does not allow this */
+			IRC_WriteStrClient(Client, ERR_BANNEDFROMCHAN_MSG, Client_ID(Client), channame);
+			break;
+		}
+
+		/* Local client? */
+		if (Client_Type(Client) == CLIENT_USER) {
+			/* Test if the user has reached the channel limit */
+			if ((Conf_MaxJoins > 0) &&
+			    (Channel_CountForUser(Client) >= Conf_MaxJoins))
+				return IRC_WriteStrClient(Client,
+						ERR_TOOMANYCHANNELS_MSG,
+						Client_ID(Client), channame);
+			if (chan) {
+				/* Already existing channel: check if the
+				 * client is allowed to join */
+				if (!join_allowed(Client, chan, channame, key))
+					break;
+			} else {
+				/* New channel: first user will become channel
+				 * operator unless this is a modeless channel */
+				if (*channame != '+')
+					flags = "o";
+			}
+
+			/* Local client: update idle time */
+			Conn_UpdateIdle(Client_Conn(Client));
+		} else {
+			/* Remote server: we don't need to know whether the
+			 * client is invited or not, but we have to make sure
+			 * that the "one shot" entries (generated by INVITE
+			 * commands) in this list become deleted when a user
+			 * joins a channel this way. */
+			if (chan)
+				(void)Lists_Check(Channel_GetListInvites(chan),
+						  target);
+		}
+
+		/* Join channel (and create channel if it doesn't exist) */
+		if (!Channel_Join(target, channame))
+			break;
+
+		if (!chan) { /* channel is new; it has been created above */
+			chan = Channel_Search(channame);
+			assert(chan != NULL);
+			if (Channel_IsModeless(chan)) {
+				Channel_ModeAdd(chan, 't'); /* /TOPIC not allowed */
+				Channel_ModeAdd(chan, 'n'); /* no external msgs */
+			}
 		}
+		assert(chan != NULL);
+
+		join_set_channelmodes(chan, target, flags);
 
-		/* naechsten Namen ermitteln */
-		chan = strtok( NULL, "," );
+		join_forward(Client, target, chan, channame);
+
+		if (!join_send_topic(Client, target, chan, channame))
+			break; /* write error */
+
+		/* next channel? */
+		channame = strtok_r(NULL, ",", &lastchan);
+		if (channame && key)
+			key = strtok_r(NULL, ",", &lastkey);
 	}
 	return CONNECTED;
+} /* IRC_JOIN */
+
+
+/**
+ * Handler for the IRC "PART" command.
+ */
+GLOBAL bool
+IRC_PART(CLIENT * Client, REQUEST * Req)
+{
+	CLIENT *target;
+	char *chan;
+
+	assert(Client != NULL);
+	assert(Req != NULL);
+
+	if (Req->argc < 1 || Req->argc > 2)
+		return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
+					  Client_ID(Client), Req->command);
+
+	/* Get the sender */
+	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);
+
+	/* Loop over all the given channel names */
+	chan = strtok(Req->argv[0], ",");
+
+	/* Make sure that "chan" is not the empty string ("PART :") */
+	if (! chan)
+		return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG,
+					  Client_ID(Client), Req->command);
+
+	while (chan) {
+		Channel_Part(target, Client, chan,
+			     Req->argc > 1 ? Req->argv[1] : Client_ID(target));
+		chan = strtok(NULL, ",");
+	}
+
+	/* Update idle time, if local client */
+	if (Client_Conn(Client) > NONE)
+		Conn_UpdateIdle(Client_Conn(Client));
+
+	return CONNECTED;
 } /* IRC_PART */
 
 
-GLOBAL BOOLEAN
+GLOBAL bool
 IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 {
 	CHANNEL *chan;
 	CLIENT *from;
-	CHAR *topic;
+	char *topic;
+	bool r;
 
 	assert( Client != NULL );
 	assert( Req != NULL );
 
-	/* Falsche Anzahl Parameter? */
-	if(( Req->argc < 1 ) || ( Req->argc > 2 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
+	if ((Req->argc < 1) || (Req->argc > 2))
+		return IRC_WriteStrClient(Client, ERR_NEEDMOREPARAMS_MSG, Client_ID(Client), Req->command);
 
 	if( Client_Type( Client ) == CLIENT_SERVER ) from = Client_Search( Req->prefix );
 	else from = Client;
@@ -239,10 +428,22 @@ IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 
 	if( Req->argc == 1 )
 	{
-		/* Topic erfragen */
-		topic = Channel_Topic( chan );
-		if( *topic ) return IRC_WriteStrClient( from, RPL_TOPIC_MSG, Client_ID( from ), Channel_Name( chan ), topic );
-		else return IRC_WriteStrClient( from, RPL_NOTOPIC_MSG, Client_ID( from ), Channel_Name( chan ));
+		/* Request actual topic */
+		topic = Channel_Topic(chan);
+		if (*topic) {
+			r = IRC_WriteStrClient(from, RPL_TOPIC_MSG,
+				Client_ID(Client), Channel_Name(chan), topic);
+#ifndef STRICT_RFC
+			r = IRC_WriteStrClient(from, RPL_TOPICSETBY_MSG,
+				Client_ID(Client), Channel_Name(chan),
+				Channel_TopicWho(chan),
+				Channel_TopicTime(chan));
+#endif
+			return r;
+		}
+		else
+			 return IRC_WriteStrClient(from, RPL_NOTOPIC_MSG,
+					Client_ID(from), Channel_Name(chan));
 	}
 
 	if( strchr( Channel_Modes( chan ), 't' ))
@@ -251,95 +452,138 @@ IRC_TOPIC( CLIENT *Client, REQUEST *Req )
 		if( ! strchr( Channel_UserModes( chan, from ), 'o' )) return IRC_WriteStrClient( from, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( from ), Channel_Name( chan ));
 	}
 
-	/* Topic setzen */
-	Channel_SetTopic( chan, Req->argv[1] );
-	Log( LOG_DEBUG, "User \"%s\" set topic on \"%s\": %s", Client_Mask( from ), Channel_Name( chan ), Req->argv[1][0] ? Req->argv[1] : "<none>" );
-
-	/* im Channel bekannt machen und an Server weiterleiten */
-	IRC_WriteStrServersPrefix( Client, from, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
-	IRC_WriteStrChannelPrefix( Client, chan, from, FALSE, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
-
-	if( Client_Type( Client ) == CLIENT_USER ) return IRC_WriteStrClientPrefix( Client, Client, "TOPIC %s :%s", Req->argv[0], Req->argv[1] );
-	else return CONNECTED;
+	/* Set new topic */
+	Channel_SetTopic(chan, from, Req->argv[1]);
+	LogDebug("%s \"%s\" set topic on \"%s\": %s",
+		 Client_TypeText(from), Client_Mask(from), Channel_Name(chan),
+		 Req->argv[1][0] ? Req->argv[1] : "<none>");
+
+	/* Update channel and forward new topic to other servers */
+	if (!Channel_IsLocal(chan))
+		IRC_WriteStrServersPrefix(Client, from, "TOPIC %s :%s",
+					  Req->argv[0], Req->argv[1]);
+	IRC_WriteStrChannelPrefix(Client, chan, from, false, "TOPIC %s :%s",
+				  Req->argv[0], Req->argv[1]);
+
+	if (Client_Type(Client) == CLIENT_USER)
+		return IRC_WriteStrClientPrefix(Client, Client, "TOPIC %s :%s",
+						Req->argv[0], Req->argv[1]);
+	else
+		return CONNECTED;
 } /* IRC_TOPIC */
 
 
-GLOBAL BOOLEAN
+/**
+ * Handler for the IRC "LIST" command.
+ * This implementation handles the local case as well as the forwarding of the
+ * LIST command to other servers in the IRC network.
+ */
+GLOBAL bool
 IRC_LIST( CLIENT *Client, REQUEST *Req )
 {
-	CHAR *pattern;
+	char *pattern;
 	CHANNEL *chan;
 	CLIENT *from, *target;
 
 	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 );
+	/* Bad number of prameters? */
+	if( Req->argc > 2 )
+		return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG,
+			Client_ID( Client ), Req->command );
 
-	if( Req->argc > 0 ) pattern = strtok( Req->argv[0], "," );
-	else pattern = "*";
+	if( Req->argc > 0 )
+		pattern = strtok( Req->argv[0], "," );
+	else
+		pattern = "*";
 
-	/* 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_NOSUCHSERVER_MSG, Client_ID( Client ), Req->prefix );
+	/* Get sender from prefix, if any */
+	if( Client_Type( Client ) == CLIENT_SERVER )
+		from = Client_Search( Req->prefix );
+	else
+		from = Client;
+
+	if( ! from )
+		return IRC_WriteStrClient( Client, ERR_NOSUCHSERVER_MSG,
+				Client_ID( Client ), Req->prefix );
 
 	if( Req->argc == 2 )
 	{
-		/* an anderen Server forwarden */
+		/* Forward to other server? */
 		target = Client_Search( Req->argv[1] );
-		if( ! target ) return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG, Client_ID( Client ), Req->argv[1] );
+		if(( ! target ) || ( Client_Type( target ) != CLIENT_SERVER ))
+			return IRC_WriteStrClient( from, ERR_NOSUCHSERVER_MSG,
+					Client_ID( Client ), Req->argv[1] );
 
 		if( target != Client_ThisServer( ))
 		{
-			/* Ok, anderer Server ist das Ziel: forwarden */
-			return IRC_WriteStrClientPrefix( target, from, "LIST %s :%s", from, Req->argv[1] );
+			/* Target is indeed an other server, forward it! */
+			return IRC_WriteStrClientPrefix( target, from,
+					"LIST %s :%s", Client_ID( from ),
+					Req->argv[1] );
 		}
 	}
-	
+
 	while( pattern )
 	{
-		/* alle Channel durchgehen */
+		/* Loop through all the channels */
 		chan = Channel_First( );
 		while( chan )
 		{
-			/* Passt die Suchmaske auf diesen Channel? */
+			/* Check search pattern */
 			if( Match( pattern, Channel_Name( chan )))
 			{
-				/* Treffer! */
-				if( ! IRC_WriteStrClient( from, RPL_LIST_MSG, from, Channel_Name( chan ), Channel_MemberCount( chan ), Channel_Topic( chan ))) return DISCONNECTED;
+				/* Gotcha! */
+				if( ! strchr( Channel_Modes( chan ), 's' ) ||
+				    Channel_IsMemberOf( chan, from ))
+				{
+					if( ! IRC_WriteStrClient( from,
+					    RPL_LIST_MSG, Client_ID( from ),
+					    Channel_Name( chan ),
+					    Channel_MemberCount( chan ),
+					    Channel_Topic( chan )))
+						return DISCONNECTED;
+				}
 			}
 			chan = Channel_Next( chan );
 		}
-		
-		/* naechsten Namen ermitteln */
-		if( Req->argc > 0 ) pattern = strtok( NULL, "," );
-		else pattern = NULL;
+
+		/* Get next name ... */
+		if( Req->argc > 0 )
+			pattern = strtok( NULL, "," );
+		else
+			pattern = NULL;
 	}
-	
-	return IRC_WriteStrClient( from, RPL_LISTEND_MSG, from );
+
+	return IRC_WriteStrClient( from, RPL_LISTEND_MSG, Client_ID( from ));
 } /* IRC_LIST */
 
 
-GLOBAL BOOLEAN
+GLOBAL bool
 IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 {
+	char modes_add[COMMAND_LEN], l[16], *ptr;
 	CLIENT *from;
 	CHANNEL *chan;
-	CHAR *ptr;
+	int arg_topic;
 
 	assert( Client != NULL );
 	assert( Req != NULL );
 
-	/* Falsche Anzahl Parameter? */
-	if(( Req->argc < 1 ) || ( Req->argc > 3 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
+	/* Bad number of parameters? */
+	if(( Req->argc < 2 ) || ( Req->argc == 4 ) || ( Req->argc > 5 )) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
+
+	/* Compatibility kludge */
+	if( Req->argc == 5 ) arg_topic = 4;
+	else if( Req->argc == 3 ) arg_topic = 2;
+	else arg_topic = -1;
 
-	/* From-Server suchen */
+	/* Search origin */
 	from = Client_Search( Req->prefix );
 	if( ! from ) return IRC_WriteStrClient( Client, ERR_NOSUCHNICK_MSG, Client_ID( Client ), Req->prefix );
 
-	/* Channel suchen bzw. erzeugen */
+	/* Search or create channel */
 	chan = Channel_Search( Req->argv[0] );
 	if( ! chan ) chan = Channel_Create( Req->argv[0] );
 	if( ! chan ) return CONNECTED;
@@ -349,27 +593,62 @@ IRC_CHANINFO( CLIENT *Client, REQUEST *Req )
 		ptr = Channel_Modes( chan );
 		if( ! *ptr )
 		{
-			/* OK, es sind noch keine Modes gesetzt */
+			/* OK, this channel doesn't have modes jet, set the received ones: */
 			Channel_SetModes( chan, &Req->argv[1][1] );
-			IRC_WriteStrChannelPrefix( Client, chan, from, FALSE, "MODE %s +%s", Req->argv[0], &Req->argv[1][1] );
+
+			if( Req->argc == 5 )
+			{
+				if( strchr( Channel_Modes( chan ), 'k' )) Channel_SetKey( chan, Req->argv[2] );
+				if( strchr( Channel_Modes( chan ), 'l' )) Channel_SetMaxUsers( chan, atol( Req->argv[3] ));
+			}
+			else
+			{
+				/* Delete modes which we never want to inherit */
+				Channel_ModeDel( chan, 'l' );
+				Channel_ModeDel( chan, 'k' );
+			}
+
+			strcpy( modes_add, "" );
+			ptr = Channel_Modes( chan );
+			while( *ptr )
+			{
+				if( *ptr == 'l' )
+				{
+					snprintf( l, sizeof( l ), " %lu", Channel_MaxUsers( chan ));
+					strlcat( modes_add, l, sizeof( modes_add ));
+				}
+				if( *ptr == 'k' )
+				{
+					strlcat( modes_add, " ", sizeof( modes_add ));
+					strlcat( modes_add, Channel_Key( chan ), sizeof( modes_add ));
+				}
+	     			ptr++;
+			}
+
+			/* Inform members of this channel */
+			IRC_WriteStrChannelPrefix( Client, chan, from, false, "MODE %s +%s%s", Req->argv[0], Channel_Modes( chan ), modes_add );
 		}
 	}
-	else Log( LOG_WARNING, "CHANNELINFO: invalid MODE format ignored!" );
+	else Log( LOG_WARNING, "CHANINFO: invalid MODE format ignored!" );
 
-	if( Req->argc == 3 )
+	if( arg_topic > 0 )
 	{
-		/* Es wurde auch ein Topic mit uebermittelt */
+		/* We got a topic */
 		ptr = Channel_Topic( chan );
-		if( ! *ptr )
+		if(( ! *ptr ) && ( Req->argv[arg_topic][0] ))
 		{
-			/* OK, es ist bisher kein Topic gesetzt */
-			Channel_SetTopic( chan, Req->argv[2] );
-			IRC_WriteStrChannelPrefix( Client, chan, from, FALSE, "TOPIC %s :%s", Req->argv[0], Req->argv[2] );
+			/* OK, there is no topic jet */
+			Channel_SetTopic(chan, Client, Req->argv[arg_topic]);
+			IRC_WriteStrChannelPrefix(Client, chan, from, false,
+			     "TOPIC %s :%s", Req->argv[0], Channel_Topic(chan));
 		}
 	}
 
-	/* an andere Server forwarden */
-	IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
+	/* Forward CHANINFO to other serevrs */
+	if( Req->argc == 5 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2], Req->argv[3], Req->argv[4] );
+	else if( Req->argc == 3 ) IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s :%s", Req->argv[0], Req->argv[1], Req->argv[2] );
+	else IRC_WriteStrServersPrefixFlag( Client, from, 'C', "CHANINFO %s %s", Req->argv[0], Req->argv[1] );
+
 	return CONNECTED;
 } /* IRC_CHANINFO */