]> arthur.barton.de Git - ngircd.git/blobdiff - src/ngircd/channel.c
KICK: Fix denial of service bug
[ngircd.git] / src / ngircd / channel.c
index 5caf7d0ce267fa68598cbca60c67414b29b15f03..45bf615c29d604b453807e2a1e6c2b07c8c3f02c 100644 (file)
@@ -1,46 +1,45 @@
 /*
  * ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001-2005 by Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2012 Alexander Barton (alex@barton.de) and 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.
  * Please read the file COPYING, README and AUTHORS for more information.
- *
- * Channel management
  */
 
-
 #define __channel_c__
 
-
 #include "portab.h"
 
-static char UNUSED id[] = "$Id: channel.c,v 1.65 2008/02/05 16:31:35 fw Exp $";
+/**
+ * @file
+ * Channel management
+ */
 
 #include "imp.h"
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
 #include <errno.h>
+#include <stdio.h>
 #include <strings.h>
 
 #include "defines.h"
 #include "conn-func.h"
-#include "client.h"
 
 #include "exp.h"
 #include "channel.h"
 
 #include "imp.h"
 #include "irc-write.h"
-#include "resolve.h"
 #include "conf.h"
 #include "hash.h"
 #include "lists.h"
 #include "log.h"
 #include "messages.h"
+#include "match.h"
 
 #include "exp.h"
 
@@ -59,7 +58,9 @@ static CL2CHAN *Add_Client PARAMS(( CHANNEL *Chan, CLIENT *Client ));
 static bool Remove_Client PARAMS(( int Type, CHANNEL *Chan, CLIENT *Client, CLIENT *Origin, const char *Reason, bool InformServer ));
 static CL2CHAN *Get_First_Cl2Chan PARAMS(( CLIENT *Client, CHANNEL *Chan ));
 static CL2CHAN *Get_Next_Cl2Chan PARAMS(( CL2CHAN *Start, CLIENT *Client, CHANNEL *Chan ));
-static bool Delete_Channel PARAMS(( CHANNEL *Chan ));
+static void Delete_Channel PARAMS(( CHANNEL *Chan ));
+static void Free_Channel PARAMS(( CHANNEL *Chan ));
+static void Set_KeyFile PARAMS((CHANNEL *Chan, const char *KeyFile));
 
 
 GLOBAL void
@@ -78,6 +79,14 @@ Channel_GetListBans(CHANNEL *c)
 }
 
 
+GLOBAL struct list_head *
+Channel_GetListExcepts(CHANNEL *c)
+{
+       assert(c != NULL);
+       return &c->list_excepts;
+}
+
+
 GLOBAL struct list_head *
 Channel_GetListInvites(CHANNEL *c)
 {
@@ -86,63 +95,92 @@ Channel_GetListInvites(CHANNEL *c)
 }
 
 
+/**
+ * Generate predefined persistent channels and &SERVER
+ */
 GLOBAL void
 Channel_InitPredefined( void )
 {
-       /* Generate predefined persistent channels */
+       CHANNEL *new_chan;
+       const struct Conf_Channel *conf_chan;
+       const char *c;
+       size_t i, channel_count = array_length(&Conf_Channels, sizeof(*conf_chan));
 
-       CHANNEL *chan;
-       char *c;
-       unsigned int i;
+       conf_chan = array_start(&Conf_Channels);
 
-       for( i = 0; i < Conf_Channel_Count; i++ )
-       {
-               /* Check for Name configuration */
-               if( ! Conf_Channel[i].name[0] ) continue;
+       assert(channel_count == 0 || conf_chan != NULL);
 
-               /* Check for invalid channel name */
-               if( ! Channel_IsValidName( Conf_Channel[i].name ))
-               {
-                       Log( LOG_ERR, "Can't create pre-defined channel: invalid name: \"%s\"!", Conf_Channel[i].name );
-                       array_free(&Conf_Channel[i].topic);
+       for (i = 0; i < channel_count; i++, conf_chan++) {
+               if (!conf_chan->name[0])
+                       continue;
+               if (!Channel_IsValidName(conf_chan->name)) {
+                       Log(LOG_ERR,
+                           "Can't create pre-defined channel: invalid name: \"%s\"",
+                           conf_chan->name);
                        continue;
                }
 
-               /* Check if the channel name is already in use */
-               chan = Channel_Search( Conf_Channel[i].name );
-               if( chan )
-               {
-                       Log( LOG_INFO, "Can't create pre-defined channel \"%s\": name already in use.", Conf_Channel[i].name );
-                       array_free(&Conf_Channel[i].topic);
+               new_chan = Channel_Search(conf_chan->name);
+               if (new_chan) {
+                       Log(LOG_INFO,
+                           "Can't create pre-defined channel \"%s\": name already in use.",
+                           conf_chan->name);
+                       Set_KeyFile(new_chan, conf_chan->keyfile);
                        continue;
                }
 
-               /* Create channel */
-               chan = Channel_Create(Conf_Channel[i].name);
-               if (chan) {
-                       Channel_ModeAdd(chan, 'P');
+               new_chan = Channel_Create(conf_chan->name);
+               if (!new_chan) {
+                       Log(LOG_ERR, "Can't create pre-defined channel \"%s\"!",
+                                                       conf_chan->name);
+                       continue;
+               }
+               Log(LOG_INFO, "Created pre-defined channel \"%s\".",
+                                               conf_chan->name);
 
-                       if (array_start(&Conf_Channel[i].topic) != NULL)
-                               Channel_SetTopic(chan, NULL,
-                                        array_start(&Conf_Channel[i].topic));
-                       array_free(&Conf_Channel[i].topic);
+               Channel_ModeAdd(new_chan, 'P');
 
-                       c = Conf_Channel[i].modes;
-                       while (*c)
-                               Channel_ModeAdd(chan, *c++);
+               if (conf_chan->topic[0])
+                       Channel_SetTopic(new_chan, NULL, conf_chan->topic);
 
-                       Channel_SetKey(chan, Conf_Channel[i].key);
-                       Channel_SetMaxUsers(chan, Conf_Channel[i].maxusers);
+               c = conf_chan->modes;
+               while (*c)
+                       Channel_ModeAdd(new_chan, *c++);
 
-                       Log(LOG_INFO, "Created pre-defined channel \"%s\".",
-                                                       Conf_Channel[i].name );
-               }
-               else Log(LOG_ERR, "Can't create pre-defined channel \"%s\"!",
-                                                       Conf_Channel[i].name );
+               Channel_SetKey(new_chan, conf_chan->key);
+               Channel_SetMaxUsers(new_chan, conf_chan->maxusers);
+               Set_KeyFile(new_chan, conf_chan->keyfile);
        }
+       if (channel_count)
+               array_free(&Conf_Channels);
+
+       /* Make sure the local &SERVER channel exists */
+       if (!Channel_Search("&SERVER")) {
+               new_chan = Channel_Create("&SERVER");
+               if (new_chan) {
+                       Channel_SetModes(new_chan, "mnPt");
+                       Channel_SetTopic(new_chan, Client_ThisServer(),
+                                        "Server Messages");
+               } else
+                       Log(LOG_ERR, "Failed to create \"&SERVER\" channel!");
+       } else
+               LogDebug("Required channel \"&SERVER\" already exists, ok.");
 } /* Channel_InitPredefined */
 
 
+static void
+Free_Channel(CHANNEL *chan)
+{
+       array_free(&chan->topic);
+       array_free(&chan->keyfile);
+       Lists_Free(&chan->list_bans);
+       Lists_Free(&chan->list_excepts);
+       Lists_Free(&chan->list_invites);
+
+       free(chan);
+}
+
+
 GLOBAL void
 Channel_Exit( void )
 {
@@ -151,20 +189,17 @@ Channel_Exit( void )
 
        /* free struct Channel */
        c = My_Channels;
-       while( c )
-       {
+       while (c) {
                c_next = c->next;
-               array_free(&c->topic);
-               free( c );
+               Free_Channel(c);
                c = c_next;
        }
 
        /* Free Channel allocation table */
        cl2chan = My_Cl2Chan;
-       while( c )
-       {
+       while (cl2chan) {
                cl2chan_next = cl2chan->next;
-               free( cl2chan );
+               free(cl2chan);
                cl2chan = cl2chan_next;
        }
 } /* Channel_Exit */
@@ -179,34 +214,38 @@ Channel_Exit( void )
  * Add_Client().
  */
 GLOBAL bool
-Channel_Join( CLIENT *Client, char *Name )
+Channel_Join( CLIENT *Client, const char *Name )
 {
        CHANNEL *chan;
 
-       assert( Client != NULL );
-       assert( Name != NULL );
+       assert(Client != NULL);
+       assert(Name != NULL);
 
        /* Check that the channel name is valid */
-       if( ! Channel_IsValidName( Name )) {
-               IRC_WriteStrClient( Client, ERR_NOSUCHCHANNEL_MSG, Client_ID( Client ), Name );
+       if (! Channel_IsValidName(Name)) {
+               IRC_WriteStrClient(Client, ERR_NOSUCHCHANNEL_MSG,
+                                  Client_ID(Client), Name);
                return false;
        }
 
-       chan = Channel_Search( Name );
-       if( chan ) {
+       chan = Channel_Search(Name);
+       if(chan) {
                /* Check if the client is already in the channel */
-               if( Get_Cl2Chan( chan, Client )) return false;
-       }
-       else
-       {
-               /* If the specified channel doesn't exist, the channel is created */
-               chan = Channel_Create( Name );
-               if (!chan) return false;
+               if (Get_Cl2Chan(chan, Client))
+                       return false;
+       } else {
+               /* If the specified channel does not exist, the channel
+                * is now created */
+               chan = Channel_Create(Name);
+               if (!chan)
+                       return false;
        }
 
        /* Add user to Channel */
-       if( ! Add_Client( chan, Client )) return false;
-       else return true;
+       if (! Add_Client(chan, Client))
+               return false;
+
+       return true;
 } /* Channel_Join */
 
 
@@ -241,6 +280,9 @@ Channel_Part(CLIENT * Client, CLIENT * Origin, const char *Name, const char *Rea
                return false;
        }
 
+       if (Conf_MorePrivacy)
+               Reason = "";
+
        /* Part client from channel */
        if (!Remove_Client(REMOVE_PART, chan, Client, Origin, Reason, true))
                return false;
@@ -249,16 +291,22 @@ Channel_Part(CLIENT * Client, CLIENT * Origin, const char *Name, const char *Rea
 } /* Channel_Part */
 
 
-/* Kick user from Channel */
+/**
+ * Kick user from Channel
+ */
 GLOBAL void
-Channel_Kick( CLIENT *Client, CLIENT *Origin, const char *Name, const char *Reason )
+Channel_Kick(CLIENT *Peer, CLIENT *Target, CLIENT *Origin, const char *Name,
+            const char *Reason )
 {
        CHANNEL *chan;
+       char *ptr, *target_modes;
+       bool can_kick = false;
 
-       assert( Client != NULL );
-       assert( Origin != NULL );
-       assert( Name != NULL );
-       assert( Reason != NULL );
+       assert(Peer != NULL);
+       assert(Target != NULL);
+       assert(Origin != NULL);
+       assert(Name != NULL);
+       assert(Reason != NULL);
 
        /* Check that channel exists */
        chan = Channel_Search( Name );
@@ -268,40 +316,95 @@ Channel_Kick( CLIENT *Client, CLIENT *Origin, const char *Name, const char *Reas
                return;
        }
 
-       /* Check that user is on the specified channel */
-       if( ! Channel_IsMemberOf( chan, Origin ))
-       {
-               IRC_WriteStrClient( Origin, ERR_NOTONCHANNEL_MSG, Client_ID( Origin ), Name );
-               return;
+       if (Client_Type(Peer) != CLIENT_SERVER &&
+           Client_Type(Origin) != CLIENT_SERVICE) {
+               /* Check that user is on the specified channel */
+               if (!Channel_IsMemberOf(chan, Origin)) {
+                       IRC_WriteStrClient( Origin, ERR_NOTONCHANNEL_MSG,
+                                           Client_ID(Origin), Name);
+                       return;
+               }
        }
 
-       /* Check if user has operator status */
-       if( ! strchr( Channel_UserModes( chan, Origin ), 'o' ))
-       {
-               IRC_WriteStrClient( Origin, ERR_CHANOPRIVSNEEDED_MSG, Client_ID( Origin ), Name);
+       /* Check that the client to be kicked is on the specified channel */
+       if (!Channel_IsMemberOf(chan, Target)) {
+               IRC_WriteStrClient(Origin, ERR_USERNOTINCHANNEL_MSG,
+                                  Client_ID(Origin), Client_ID(Target), Name );
                return;
        }
 
-       /* Check that the client to be kicked is on the specified channel */
-       if( ! Channel_IsMemberOf( chan, Client ))
-       {
-               IRC_WriteStrClient( Origin, ERR_USERNOTINCHANNEL_MSG, Client_ID( Origin ), Client_ID( Client ), Name );
-               return;
+       if(Client_Type(Peer) == CLIENT_USER) {
+               /* Channel mode 'Q' and user mode 'q' on target: nobody but
+                * IRC Operators and servers can kick the target user */
+               if ((strchr(Channel_Modes(chan), 'Q')
+                    || Client_HasMode(Target, 'q')
+                    || Client_Type(Target) == CLIENT_SERVICE)
+                   && !Client_HasMode(Origin, 'o')) {
+                       IRC_WriteStrClient(Origin, ERR_KICKDENY_MSG,
+                                          Client_ID(Origin), Name,
+                                          Client_ID(Target));
+                       return;
+               }
+
+               /* Check if client has the rights to kick target */
+               ptr = Channel_UserModes(chan, Peer);
+               target_modes = Channel_UserModes(chan, Target);
+               while(*ptr) {
+                       /* Owner can kick everyone */
+                       if ( *ptr == 'q') {
+                               can_kick = true;
+                               break;
+                       }
+                       /* Admin can't kick owner */
+                       if ( *ptr == 'a' ) {
+                               if (!strchr(target_modes, 'q')) {
+                                       can_kick = true;
+                                       break;
+                               }
+                       }
+                       /* Op can't kick owner | admin */
+                       if ( *ptr == 'o' ) {
+                               if (!strchr(target_modes, 'q') &&
+                                   !strchr(target_modes, 'a')) {
+                                       can_kick = true;
+                                       break;
+                               }
+                       }
+                       /* Half Op can't kick owner | admin | op */ 
+                       if ( *ptr == 'h' ) {
+                               if (!strchr(target_modes, 'q') &&
+                                   !strchr(target_modes, 'a') &&
+                                   !strchr(target_modes, 'o')) {
+                                       can_kick = true;
+                                       break;
+                               }
+                       }
+                       ptr++;
+               }
+
+               if(!can_kick) {
+                       IRC_WriteStrClient(Origin, ERR_CHANOPPRIVTOOLOW_MSG,
+                               Client_ID(Origin), Name);
+                       return;
+               }
        }
 
        /* Kick Client from channel */
-       Remove_Client( REMOVE_KICK, chan, Client, Origin, Reason, true);
+       Remove_Client( REMOVE_KICK, chan, Target, Origin, Reason, true);
 } /* Channel_Kick */
 
 
 GLOBAL void
-Channel_Quit( CLIENT *Client, char *Reason )
+Channel_Quit( CLIENT *Client, const char *Reason )
 {
        CHANNEL *c, *next_c;
 
        assert( Client != NULL );
        assert( Reason != NULL );
 
+       if (Conf_MorePrivacy)
+               Reason = "";
+
        IRC_WriteStrRelatedPrefix( Client, Client, false, "QUIT :%s", Reason );
 
        c = My_Channels;
@@ -314,20 +417,31 @@ Channel_Quit( CLIENT *Client, char *Reason )
 } /* Channel_Quit */
 
 
+/**
+ * Get number of channels this server knows and that are "visible" to
+ * the given client. If no client is given, all channels will be counted.
+ *
+ * @param Client The client to check or NULL.
+ * @return Number of channels visible to the client.
+ */
 GLOBAL unsigned long
-Channel_Count( void )
+Channel_CountVisible (CLIENT *Client)
 {
        CHANNEL *c;
        unsigned long count = 0;
 
        c = My_Channels;
-       while( c )
-       {
-               count++;
+       while(c) {
+               if (Client) {
+                       if (!strchr(Channel_Modes(c), 's')
+                           || Channel_IsMemberOf(c, Client))
+                               count++;
+               } else
+                       count++;
                c = c->next;
        }
        return count;
-} /* Channel_Count */
+}
 
 
 GLOBAL unsigned long
@@ -419,7 +533,7 @@ Channel_Next( CHANNEL *Chan )
 GLOBAL CHANNEL *
 Channel_Search( const char *Name )
 {
-       /* Channel-Struktur suchen */
+       /* Search channel structure */
 
        CHANNEL *c;
        UINT32 search_hash;
@@ -432,7 +546,7 @@ Channel_Search( const char *Name )
        {
                if( search_hash == c->hash )
                {
-                       /* lt. Hash-Wert: Treffer! */
+                       /* hash hit */
                        if( strcasecmp( Name, c->name ) == 0 ) return c;
                }
                c = c->next;
@@ -496,7 +610,11 @@ Channel_IsValidName( const char *Name )
 {
        assert( Name != NULL );
 
-       if (strchr("+#", Name[0]) == NULL)
+#ifdef STRICT_RFC
+       if (strlen(Name) <= 1)
+               return false;
+#endif
+       if (strchr("#&+", Name[0]) == NULL)
                return false;
        if (strlen(Name) >= CHANNEL_NAME_LEN)
                return false;
@@ -665,11 +783,19 @@ Channel_TopicWho(CHANNEL *Chan)
        return Chan->topic_who;
 } /* Channel_TopicWho */
 
+
+GLOBAL unsigned int
+Channel_CreationTime(CHANNEL *Chan)
+{
+       assert(Chan != NULL);
+       return (unsigned int) Chan->creation_time;
+} /* Channel_CreationTime */
+
 #endif
 
 
 GLOBAL void
-Channel_SetTopic(CHANNEL *Chan, CLIENT *Client, char *Topic)
+Channel_SetTopic(CHANNEL *Chan, CLIENT *Client, const char *Topic)
 {
        size_t len;
        assert( Chan != NULL );
@@ -697,7 +823,7 @@ Channel_SetTopic(CHANNEL *Chan, CLIENT *Client, char *Topic)
 
 
 GLOBAL void
-Channel_SetModes( CHANNEL *Chan, char *Modes )
+Channel_SetModes( CHANNEL *Chan, const char *Modes )
 {
        assert( Chan != NULL );
        assert( Modes != NULL );
@@ -707,7 +833,7 @@ Channel_SetModes( CHANNEL *Chan, char *Modes )
 
 
 GLOBAL void
-Channel_SetKey( CHANNEL *Chan, char *Key )
+Channel_SetKey( CHANNEL *Chan, const char *Key )
 {
        assert( Chan != NULL );
        assert( Key != NULL );
@@ -727,19 +853,36 @@ Channel_SetMaxUsers(CHANNEL *Chan, unsigned long Count)
 } /* Channel_SetMaxUsers */
 
 
+/**
+ * Check if a client is allowed to send to a specific channel.
+ *
+ * @param Chan The channel to check.
+ * @param From The client that wants to send.
+ * @return true if the client is allowed to send, false otherwise.
+ */
 static bool
 Can_Send_To_Channel(CHANNEL *Chan, CLIENT *From)
 {
-       bool is_member, has_voice, is_op;
+       bool is_member, has_voice, is_halfop, is_op, is_chanadmin, is_owner;
 
-       is_member = has_voice = is_op = false;
+       is_member = has_voice = is_halfop = is_op = is_chanadmin = is_owner = false;
+
+       /* The server itself always can send messages :-) */
+       if (Client_ThisServer() == From)
+               return true;
 
        if (Channel_IsMemberOf(Chan, From)) {
                is_member = true;
                if (strchr(Channel_UserModes(Chan, From), 'v'))
                        has_voice = true;
+               if (strchr(Channel_UserModes(Chan, From), 'h'))
+                       is_halfop = true;
                if (strchr(Channel_UserModes(Chan, From), 'o'))
                        is_op = true;
+               if (strchr(Channel_UserModes(Chan, From), 'a'))
+                       is_chanadmin = true;
+               if (strchr(Channel_UserModes(Chan, From), 'q'))
+                       is_owner = true;
        }
 
        /*
@@ -751,46 +894,48 @@ Can_Send_To_Channel(CHANNEL *Chan, CLIENT *From)
        if (strchr(Channel_Modes(Chan), 'n') && !is_member)
                return false;
 
-       if (is_op || has_voice)
+       if (strchr(Channel_Modes(Chan), 'M') && !Client_HasMode(From, 'R')
+           && !Client_HasMode(From, 'o'))
+               return false;
+
+       if (has_voice || is_halfop || is_op || is_chanadmin || is_owner)
                return true;
 
        if (strchr(Channel_Modes(Chan), 'm'))
                return false;
 
-       return !Lists_Check(&Chan->list_bans, From);
-}
-
-
-GLOBAL bool
-Channel_Write(CHANNEL *Chan, CLIENT *From, CLIENT *Client, const char *Text)
-{
-       if (!Can_Send_To_Channel(Chan, From))
-               return IRC_WriteStrClient(From, ERR_CANNOTSENDTOCHAN_MSG, Client_ID(From), Channel_Name(Chan));
-
-       if (Client_Conn(From) > NONE)
-               Conn_UpdateIdle(Client_Conn(From));
+       if (Lists_Check(&Chan->list_excepts, From))
+               return true;
 
-       return IRC_WriteStrChannelPrefix(Client, Chan, From, true,
-                       "PRIVMSG %s :%s", Channel_Name(Chan), Text);
+       return !Lists_Check(&Chan->list_bans, From);
 }
 
 
 GLOBAL bool
-Channel_Notice(CHANNEL *Chan, CLIENT *From, CLIENT *Client, const char *Text)
+Channel_Write(CHANNEL *Chan, CLIENT *From, CLIENT *Client, const char *Command,
+             bool SendErrors, const char *Text)
 {
-       if (!Can_Send_To_Channel(Chan, From))
-               return true; /* no error, see RFC 2812 */
+       if (!Can_Send_To_Channel(Chan, From)) {
+               if (! SendErrors)
+                       return CONNECTED;       /* no error, see RFC 2812 */
+               if (strchr(Channel_Modes(Chan), 'M'))
+                       return IRC_WriteStrClient(From, ERR_NEEDREGGEDNICK_MSG,
+                                                 Client_ID(From), Channel_Name(Chan));
+               else
+                       return IRC_WriteStrClient(From, ERR_CANNOTSENDTOCHAN_MSG,
+                                         Client_ID(From), Channel_Name(Chan));
+       }
 
        if (Client_Conn(From) > NONE)
                Conn_UpdateIdle(Client_Conn(From));
 
        return IRC_WriteStrChannelPrefix(Client, Chan, From, true,
-                       "NOTICE %s :%s", Channel_Name(Chan), Text);
+                       "%s %s :%s", Command, Channel_Name(Chan), Text);
 }
 
 
 GLOBAL CHANNEL *
-Channel_Create( char *Name )
+Channel_Create( const char *Name )
 {
        /* Create new CHANNEL structure and add it to linked list */
        CHANNEL *c;
@@ -807,6 +952,9 @@ Channel_Create( char *Name )
        strlcpy( c->name, Name, sizeof( c->name ));
        c->hash = Hash( c->name );
        c->next = My_Channels;
+#ifndef STRICT_RFC
+       c->creation_time = time(NULL);
+#endif
        My_Channels = c;
        LogDebug("Created new channel structure for \"%s\".", Name);
        return c;
@@ -839,7 +987,7 @@ Add_Client( CHANNEL *Chan, CLIENT *Client )
        assert( Chan != NULL );
        assert( Client != NULL );
 
-       /* neue CL2CHAN-Struktur anlegen */
+       /* Create new CL2CHAN structure */
        cl2chan = (CL2CHAN *)malloc( sizeof( CL2CHAN ));
        if( ! cl2chan )
        {
@@ -850,11 +998,11 @@ Add_Client( CHANNEL *Chan, CLIENT *Client )
        cl2chan->client = Client;
        strcpy( cl2chan->modes, "" );
 
-       /* Verketten */
+       /* concatenate */
        cl2chan->next = My_Cl2Chan;
        My_Cl2Chan = cl2chan;
 
-       Log( LOG_DEBUG, "User \"%s\" joined channel \"%s\".", Client_Mask( Client ), Chan->name );
+       LogDebug("User \"%s\" joined channel \"%s\".", Client_Mask(Client), Chan->name);
 
        return cl2chan;
 } /* Add_Client */
@@ -871,6 +1019,11 @@ Remove_Client( int Type, CHANNEL *Chan, CLIENT *Client, CLIENT *Origin, const ch
        assert( Origin != NULL );
        assert( Reason != NULL );
 
+       /* Do not inform other servers if the channel is local to this server,
+        * regardless of what the caller requested! */
+       if(InformServer)
+               InformServer = !Channel_IsLocal(Chan);
+
        last_cl2chan = NULL;
        cl2chan = My_Cl2Chan;
        while( cl2chan )
@@ -884,7 +1037,7 @@ Remove_Client( int Type, CHANNEL *Chan, CLIENT *Client, CLIENT *Origin, const ch
        c = cl2chan->channel;
        assert( c != NULL );
 
-       /* Aus Verkettung loesen und freigeben */
+       /* maintain cl2chan list */
        if( last_cl2chan ) last_cl2chan->next = cl2chan->next;
        else My_Cl2Chan = cl2chan->next;
        free( cl2chan );
@@ -892,14 +1045,16 @@ Remove_Client( int Type, CHANNEL *Chan, CLIENT *Client, CLIENT *Origin, const ch
        switch( Type )
        {
                case REMOVE_QUIT:
-                       /* QUIT: other servers have already been notified, see Client_Destroy();
-                        * so only inform other clients in same channel. */
+                       /* QUIT: other servers have already been notified, 
+                        * see Client_Destroy(); so only inform other clients
+                        * in same channel. */
                        assert( InformServer == false );
                        LogDebug("User \"%s\" left channel \"%s\" (%s).",
                                        Client_Mask( Client ), c->name, Reason );
                        break;
                case REMOVE_KICK:
-                       /* User was KICKed: inform other servers and all users in channel */
+                       /* User was KICKed: inform other servers (public
+                        * channels) and all users in the channel */
                        if( InformServer )
                                IRC_WriteStrServersPrefix( Client_NextHop( Origin ),
                                        Origin, "KICK %s %s :%s", c->name, Client_ID( Client ), Reason);
@@ -915,6 +1070,9 @@ Remove_Client( int Type, CHANNEL *Chan, CLIENT *Client, CLIENT *Origin, const ch
                                Client_Mask( Client ), c->name, Client_ID(Origin), Reason);
                        break;
                default: /* PART */
+                       if (Conf_MorePrivacy)
+                               Reason = "";
+
                        if (InformServer)
                                IRC_WriteStrServersPrefix(Origin, Client, "PART %s :%s", c->name, Reason);
 
@@ -930,7 +1088,7 @@ Remove_Client( int Type, CHANNEL *Chan, CLIENT *Client, CLIENT *Origin, const ch
                        }
        }
 
-       /* Wenn Channel nun leer und nicht pre-defined: loeschen */
+       /* When channel is empty and is not pre-defined, delete */
        if( ! strchr( Channel_Modes( Chan ), 'P' ))
        {
                if( ! Get_First_Cl2Chan( NULL, Chan )) Delete_Channel( Chan );
@@ -944,7 +1102,17 @@ GLOBAL bool
 Channel_AddBan(CHANNEL *c, const char *mask )
 {
        struct list_head *h = Channel_GetListBans(c);
-       return Lists_Add(h, mask, false);
+       LogDebug("Adding \"%s\" to \"%s\" ban list", mask, Channel_Name(c));
+       return Lists_Add(h, mask, false, NULL);
+}
+
+
+GLOBAL bool
+Channel_AddExcept(CHANNEL *c, const char *mask )
+{
+       struct list_head *h = Channel_GetListExcepts(c);
+       LogDebug("Adding \"%s\" to \"%s\" exception list", mask, Channel_Name(c));
+       return Lists_Add(h, mask, false, NULL);
 }
 
 
@@ -952,29 +1120,31 @@ GLOBAL bool
 Channel_AddInvite(CHANNEL *c, const char *mask, bool onlyonce)
 {
        struct list_head *h = Channel_GetListInvites(c);
-       return Lists_Add(h, mask, onlyonce);
+       LogDebug("Adding \"%s\" to \"%s\" invite list", mask, Channel_Name(c));
+       return Lists_Add(h, mask, onlyonce, NULL);
 }
 
 
 static bool
-ShowInvitesBans(struct list_head *head, CLIENT *Client, CHANNEL *Channel, bool invite)
+ShowChannelList(struct list_head *head, CLIENT *Client, CHANNEL *Channel,
+               char *msg, char *msg_end)
 {
        struct list_elem *e;
-       char *msg = invite ? RPL_INVITELIST_MSG : RPL_BANLIST_MSG;
-       char *msg_end;
 
-       assert( Client != NULL );
-       assert( Channel != NULL );
+       assert (Client != NULL);
+       assert (Channel != NULL);
 
        e = Lists_GetFirst(head);
        while (e) {
-               if( ! IRC_WriteStrClient( Client, msg, Client_ID( Client ),
-                               Channel_Name( Channel ), Lists_GetMask(e) )) return DISCONNECTED;
+               if (!IRC_WriteStrClient(Client, msg, Client_ID(Client),
+                                       Channel_Name(Channel),
+                                       Lists_GetMask(e)))
+                       return DISCONNECTED;
                e = Lists_GetNext(e);
        }
 
-       msg_end = invite ? RPL_ENDOFINVITELIST_MSG : RPL_ENDOFBANLIST_MSG;
-       return IRC_WriteStrClient( Client, msg_end, Client_ID( Client ), Channel_Name( Channel ));
+       return IRC_WriteStrClient(Client, msg_end, Client_ID(Client),
+                                 Channel_Name(Channel));
 }
 
 
@@ -986,7 +1156,21 @@ Channel_ShowBans( CLIENT *Client, CHANNEL *Channel )
        assert( Channel != NULL );
 
        h = Channel_GetListBans(Channel);
-       return ShowInvitesBans(h, Client, Channel, false);
+       return ShowChannelList(h, Client, Channel, RPL_BANLIST_MSG,
+                              RPL_ENDOFBANLIST_MSG);
+}
+
+
+GLOBAL bool
+Channel_ShowExcepts( CLIENT *Client, CHANNEL *Channel )
+{
+       struct list_head *h;
+
+       assert( Channel != NULL );
+
+       h = Channel_GetListExcepts(Channel);
+       return ShowChannelList(h, Client, Channel, RPL_EXCEPTLIST_MSG,
+                              RPL_ENDOFEXCEPTLIST_MSG);
 }
 
 
@@ -998,10 +1182,81 @@ Channel_ShowInvites( CLIENT *Client, CHANNEL *Channel )
        assert( Channel != NULL );
 
        h = Channel_GetListInvites(Channel);
-       return ShowInvitesBans(h, Client, Channel, true);
+       return ShowChannelList(h, Client, Channel, RPL_INVITELIST_MSG,
+                              RPL_ENDOFINVITELIST_MSG);
 }
 
 
+/**
+ * Log a message to the local &SERVER channel, if it exists.
+ */
+GLOBAL void
+Channel_LogServer(const char *msg)
+{
+       CHANNEL *sc;
+       CLIENT *c;
+
+       assert(msg != NULL);
+
+       sc = Channel_Search("&SERVER");
+       if (!sc)
+               return;
+
+       c = Client_ThisServer();
+       Channel_Write(sc, c, c, "PRIVMSG", false, msg);
+} /* Channel_LogServer */
+
+
+GLOBAL bool
+Channel_CheckKey(CHANNEL *Chan, CLIENT *Client, const char *Key)
+{
+       char *file_name, line[COMMAND_LEN], *nick, *pass;
+       FILE *fd;
+
+       assert(Chan != NULL);
+       assert(Client != NULL);
+       assert(Key != NULL);
+
+       if (!strchr(Chan->modes, 'k'))
+               return true;
+       if (*Key == '\0')
+               return false;
+       if (strcmp(Chan->key, Key) == 0)
+               return true;
+
+       file_name = array_start(&Chan->keyfile);
+       if (!file_name)
+               return false;
+       fd = fopen(file_name, "r");
+       if (!fd) {
+               Log(LOG_ERR, "Can't open channel key file \"%s\" for %s: %s",
+                   file_name, Chan->name, strerror(errno));
+               return false;
+       }
+
+       while (fgets(line, (int)sizeof(line), fd) != NULL) {
+               ngt_TrimStr(line);
+               if (! (nick = strchr(line, ':')))
+                       continue;
+               *nick++ = '\0';
+               if (!Match(line, Client_User(Client)))
+                       continue;
+               if (! (pass = strchr(nick, ':')))
+                       continue;
+               *pass++ = '\0';
+               if (!Match(nick, Client_ID(Client)))
+                       continue;
+               if (strcmp(Key, pass) != 0)
+                       continue;
+
+               fclose(fd);
+               return true;
+       }
+       fclose(fd);
+       return false;
+} /* Channel_CheckKey */
+
+
 static CL2CHAN *
 Get_First_Cl2Chan( CLIENT *Client, CHANNEL *Chan )
 {
@@ -1027,36 +1282,64 @@ Get_Next_Cl2Chan( CL2CHAN *Start, CLIENT *Client, CHANNEL *Channel )
 } /* Get_Next_Cl2Chan */
 
 
-static bool
-Delete_Channel( CHANNEL *Chan )
+/**
+ * Remove a channel and free all of its data structures.
+ */
+static void
+Delete_Channel(CHANNEL *Chan)
 {
-       /* Channel-Struktur loeschen */
-
        CHANNEL *chan, *last_chan;
 
        last_chan = NULL;
        chan = My_Channels;
-       while( chan )
-       {
-               if( chan == Chan ) break;
+       while (chan) {
+               if (chan == Chan)
+                       break;
                last_chan = chan;
                chan = chan->next;
        }
-       if( ! chan ) return false;
 
-       Log( LOG_DEBUG, "Freed channel structure for \"%s\".", Chan->name );
-
-       /* Invite- und Ban-Lists aufraeumen */
-       Lists_Free( &chan->list_bans );
-       Lists_Free( &chan->list_invites );
+       assert(chan != NULL);
+       if (!chan)
+               return;
 
-       /* Neu verketten und freigeben */
-       if( last_chan ) last_chan->next = chan->next;
-       else My_Channels = chan->next;
-       free( chan );
+       /* maintain channel list */
+       if (last_chan)
+               last_chan->next = chan->next;
+       else
+               My_Channels = chan->next;
 
-       return true;
+       LogDebug("Freed channel structure for \"%s\".", Chan->name);
+       Free_Channel(Chan);
 } /* Delete_Channel */
 
 
+static void
+Set_KeyFile(CHANNEL *Chan, const char *KeyFile)
+{
+       size_t len;
+
+       assert(Chan != NULL);
+       assert(KeyFile != NULL);
+
+       len = strlen(KeyFile);
+       if (len < array_bytes(&Chan->keyfile)) {
+               Log(LOG_INFO, "Channel key file of %s removed.", Chan->name);
+               array_free(&Chan->keyfile);
+       }
+
+       if (len < 1)
+               return;
+
+       if (!array_copyb(&Chan->keyfile, KeyFile, len+1))
+               Log(LOG_WARNING,
+                   "Could not set new channel key file \"%s\" for %s: %s",
+                   KeyFile, Chan->name, strerror(errno));
+       else
+               Log(LOG_INFO|LOG_snotice,
+                   "New local channel key file \"%s\" for %s activated.",
+                   KeyFile, Chan->name);
+} /* Set_KeyFile */
+
+
 /* -eof- */