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

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/*
* ngIRCd -- The Next Generation IRC Daemon
* Copyright (c)2001-2010 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"
#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_Ban_Invite PARAMS((int what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, const char *Pattern));
static bool Del_Ban_Invite PARAMS((int what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, const char *Pattern));
static bool Send_ListChange PARAMS(( char *Mode, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, const 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 );
}
LogDebug("%s \"%s\": Mode change, now \"%s\".",
Client_TypeText(Target), 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);
}
/**
* Handle channel mode and channel-user mode changes
*/
static bool
Channel_Mode(CLIENT *Client, REQUEST *Req, CLIENT *Origin, CHANNEL *Channel)
{
char the_modes[COMMAND_LEN], the_args[COMMAND_LEN], x[2],
argadd[CLIENT_PASS_LEN], *mode_ptr;
bool connected, set, modeok = true, skiponce, use_servermode = false, retval;
int mode_arg, arg_arg;
CLIENT *client;
long l;
size_t len;
if (Channel_IsModeless(Channel))
return IRC_WriteStrClient(Client, ERR_NOCHANMODES_MSG,
Client_ID(Client), Channel_Name(Channel));
/* 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';
connected = 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 */
case 'z': /* Secure connections only */
if (modeok)
x[0] = *mode_ptr;
else
connected = 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
connected = 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 {
connected = IRC_WriteStrClient(Origin,
ERR_CHANOPRIVSNEEDED_MSG,
Client_ID(Origin),
Channel_Name(Channel));
}
Req->argv[arg_arg][0] = '\0';
arg_arg++;
} else {
connected = IRC_WriteStrClient(Origin,
ERR_NEEDMOREPARAMS_MSG,
Client_ID(Origin), Req->command);
goto chan_exit;
}
break;
case 'l': /* Member limit */
if (!set) {
if (modeok)
x[0] = *mode_ptr;
else
connected = 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 {
connected = IRC_WriteStrClient(Origin,
ERR_CHANOPRIVSNEEDED_MSG,
Client_ID(Origin),
Channel_Name(Channel));
}
Req->argv[arg_arg][0] = '\0';
arg_arg++;
} else {
connected = IRC_WriteStrClient(Origin,
ERR_NEEDMOREPARAMS_MSG,
Client_ID(Origin), Req->command);
goto chan_exit;
}
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))
connected = IRC_WriteStrClient(Origin,
ERR_NOPRIVILEGES_MSG,
Client_ID(Origin));
else
x[0] = 'P';
} else
connected = 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
connected = IRC_WriteStrClient(Client,
ERR_NOSUCHNICK_MSG,
Client_ID(Client),
Req->argv[arg_arg]);
} else {
connected = IRC_WriteStrClient(Origin,
ERR_CHANOPRIVSNEEDED_MSG,
Client_ID(Origin),
Channel_Name(Channel));
}
Req->argv[arg_arg][0] = '\0';
arg_arg++;
} else {
connected = IRC_WriteStrClient(Origin,
ERR_NEEDMOREPARAMS_MSG,
Client_ID(Origin), Req->command);
goto chan_exit;
}
break;
/* --- Channel lists --- */
case 'I': /* Invite lists */
case 'b': /* Ban lists */
if (arg_arg > mode_arg) {
/* modify list */
if (modeok) {
connected = set
? Add_Ban_Invite(*mode_ptr, Origin,
Client, Channel,
Req->argv[arg_arg])
: Del_Ban_Invite(*mode_ptr, Origin,
Client, Channel,
Req->argv[arg_arg]);
} else {
connected = IRC_WriteStrClient(Origin,
ERR_CHANOPRIVSNEEDED_MSG,
Client_ID(Origin),
Channel_Name(Channel));
}
Req->argv[arg_arg][0] = '\0';
arg_arg++;
} else {
if (*mode_ptr == 'I')
Channel_ShowInvites(Origin, Channel);
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)
connected = IRC_WriteStrClient(Origin,
ERR_UMODEUNKNOWNFLAG2_MSG,
Client_ID(Origin),
set ? '+' : '-', *mode_ptr);
x[0] = '\0';
goto chan_exit;
} /* switch() */
if (!connected)
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 (client) {
/* Channel-User-Mode */
retval = set
? Channel_UserModeAdd(Channel, client, x[0])
: Channel_UserModeDel(Channel, client, x[0]);
if (retval) {
strlcat(the_args, " ", sizeof(the_args));
strlcat(the_args, Client_ID(client),
sizeof(the_args));
strlcat(the_modes, x, sizeof(the_modes));
LogDebug
("User \"%s\": Mode change on %s, now \"%s\"",
Client_Mask(client), Channel_Name(Channel),
Channel_UserModes(Channel, client));
}
} else {
/* Channel-Mode */
retval = set
? Channel_ModeAdd(Channel, x[0])
: Channel_ModeDel(Channel, x[0]);
if (retval) {
strlcat(the_modes, x, sizeof(the_modes));
LogDebug("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) {
/* MODE requests for local channels from other servers
* are definitely invalid! */
if (Channel_IsLocal(Channel)) {
Log(LOG_ALERT, "Got remote MODE command for local channel!? Ignored.");
return CONNECTED;
}
/* Forward mode changes to channel users and all the
* other remote 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 */
connected = IRC_WriteStrClientPrefix(Client, Origin,
"MODE %s %s%s", Channel_Name(Channel),
the_modes, the_args);
/* Only forward requests for non-local channels */
if (!Channel_IsLocal(Channel))
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 );
if( Req->argc > 1 ) return IRC_WriteStrClient( Client, ERR_NEEDMOREPARAMS_MSG, Client_ID( Client ), Req->command );
if(( Req->argc == 1 ) && (Req->argv[0][0] ))
{
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
{
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_Ban_Invite(int what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, const char *Pattern)
{
const char *mask;
bool already;
bool ret;
assert( Client != NULL );
assert( Channel != NULL );
assert( Pattern != NULL );
assert(what == 'I' || what == 'b');
mask = Lists_MakeMask(Pattern);
already = Lists_CheckDupeMask(Channel_GetListInvites(Channel), mask);
if (!already) {
if (what == 'I')
ret = Channel_AddInvite(Channel, mask, false);
else
ret = Channel_AddBan(Channel, mask);
if (!ret)
return CONNECTED;
}
if (already && (Client_Type(Prefix) == CLIENT_SERVER))
return CONNECTED;
if (what == 'I')
return Send_ListChange("+I", Prefix, Client, Channel, mask);
return Send_ListChange("+b", Prefix, Client, Channel, mask);
}
static bool
Del_Ban_Invite(int what, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, const char *Pattern)
{
const char *mask;
struct list_head *list;
assert( Client != NULL );
assert( Channel != NULL );
assert( Pattern != NULL );
assert(what == 'I' || what == 'b');
mask = Lists_MakeMask( Pattern );
if (what == 'I')
list = Channel_GetListInvites(Channel);
else
list = Channel_GetListBans(Channel);
Lists_Del(list, mask);
if (what == 'I')
return Send_ListChange( "-I", Prefix, Client, Channel, mask );
return Send_ListChange( "-b", Prefix, Client, Channel, mask );
}
static bool
Send_ListChange( char *Mode, CLIENT *Prefix, CLIENT *Client, CHANNEL *Channel, const char *Mask )
{
bool ok;
if( Client_Type( Client ) == CLIENT_USER )
{
/* send confirmation to client */
ok = IRC_WriteStrClientPrefix( Client, Prefix, "MODE %s %s %s", Channel_Name( Channel ), Mode, Mask );
}
else ok = true;
/* to other servers */
IRC_WriteStrServersPrefix( Client, Prefix, "MODE %s %s %s", Channel_Name( Channel ), Mode, Mask );
/* and local users in channel */
IRC_WriteStrChannelPrefix( Client, Channel, Prefix, false, "MODE %s %s %s", Channel_Name( Channel ), Mode, Mask );
return ok;
} /* Send_ListChange */
/* -eof- */
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