490 lines
13 KiB
C
490 lines
13 KiB
C
/*
|
|
* ngIRCd -- The Next Generation IRC Daemon
|
|
* Copyright (c)2001,2002 by 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.
|
|
*/
|
|
|
|
|
|
#include "portab.h"
|
|
|
|
static char UNUSED id[] = "$Id: parse.c,v 1.69 2007/11/21 12:16:36 alex Exp $";
|
|
|
|
/**
|
|
* @file
|
|
* IRC command parser and validator.
|
|
*/
|
|
|
|
#include "imp.h"
|
|
#include <assert.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <strings.h>
|
|
|
|
#include "ngircd.h"
|
|
#include "defines.h"
|
|
#include "conn-func.h"
|
|
#include "client.h"
|
|
#include "channel.h"
|
|
#include "log.h"
|
|
#include "messages.h"
|
|
#include "tool.h"
|
|
|
|
#include "exp.h"
|
|
#include "parse.h"
|
|
|
|
#include "imp.h"
|
|
#include "irc.h"
|
|
#include "irc-channel.h"
|
|
#include "irc-info.h"
|
|
#include "irc-login.h"
|
|
#include "irc-mode.h"
|
|
#include "irc-op.h"
|
|
#include "irc-oper.h"
|
|
#include "irc-server.h"
|
|
#include "irc-write.h"
|
|
#include "numeric.h"
|
|
|
|
#include "exp.h"
|
|
|
|
|
|
COMMAND My_Commands[] =
|
|
{
|
|
{ "ADMIN", IRC_ADMIN, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "AWAY", IRC_AWAY, CLIENT_USER, 0, 0, 0 },
|
|
{ "CONNECT", IRC_CONNECT, CLIENT_USER, 0, 0, 0 },
|
|
{ "DIE", IRC_DIE, CLIENT_USER, 0, 0, 0 },
|
|
{ "DISCONNECT", IRC_DISCONNECT, CLIENT_USER, 0, 0, 0 },
|
|
{ "ERROR", IRC_ERROR, 0xFFFF, 0, 0, 0 },
|
|
{ "HELP", IRC_HELP, CLIENT_USER, 0, 0, 0 },
|
|
{ "INVITE", IRC_INVITE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "ISON", IRC_ISON, CLIENT_USER, 0, 0, 0 },
|
|
{ "JOIN", IRC_JOIN, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "KICK", IRC_KICK, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "KILL", IRC_KILL, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "LINKS", IRC_LINKS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "LIST", IRC_LIST, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "LUSERS", IRC_LUSERS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "MODE", IRC_MODE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "MOTD", IRC_MOTD, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "NAMES", IRC_NAMES, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "NICK", IRC_NICK, 0xFFFF, 0, 0, 0 },
|
|
{ "NJOIN", IRC_NJOIN, CLIENT_SERVER, 0, 0, 0 },
|
|
{ "NOTICE", IRC_NOTICE, 0xFFFF, 0, 0, 0 },
|
|
{ "OPER", IRC_OPER, CLIENT_USER, 0, 0, 0 },
|
|
{ "PART", IRC_PART, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "PASS", IRC_PASS, 0xFFFF, 0, 0, 0 },
|
|
{ "PING", IRC_PING, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "PONG", IRC_PONG, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "PRIVMSG", IRC_PRIVMSG, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "QUIT", IRC_QUIT, 0xFFFF, 0, 0, 0 },
|
|
{ "REHASH", IRC_REHASH, CLIENT_USER, 0, 0, 0 },
|
|
{ "RESTART", IRC_RESTART, CLIENT_USER, 0, 0, 0 },
|
|
{ "SERVER", IRC_SERVER, 0xFFFF, 0, 0, 0 },
|
|
{ "SQUIT", IRC_SQUIT, CLIENT_SERVER, 0, 0, 0 },
|
|
{ "STATS", IRC_STATS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "TIME", IRC_TIME, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "TOPIC", IRC_TOPIC, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "TRACE", IRC_TRACE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "USER", IRC_USER, 0xFFFF, 0, 0, 0 },
|
|
{ "USERHOST", IRC_USERHOST, CLIENT_USER, 0, 0, 0 },
|
|
{ "VERSION", IRC_VERSION, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "WALLOPS", IRC_WALLOPS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "WHO", IRC_WHO, CLIENT_USER, 0, 0, 0 },
|
|
{ "WHOIS", IRC_WHOIS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
{ "WHOWAS", IRC_WHOWAS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
|
|
#ifdef IRCPLUS
|
|
{ "CHANINFO", IRC_CHANINFO, CLIENT_SERVER, 0, 0, 0 },
|
|
#endif
|
|
{ NULL, NULL, 0x0, 0, 0, 0 } /* Ende-Marke */
|
|
};
|
|
|
|
NUMERIC My_Numerics[] =
|
|
{
|
|
{ 005, IRC_Num_ISUPPORT },
|
|
{ 376, IRC_Num_ENDOFMOTD },
|
|
{ 0, NULL } /* end marker */
|
|
};
|
|
|
|
|
|
static void Init_Request PARAMS(( REQUEST *Req ));
|
|
|
|
static bool Validate_Prefix PARAMS(( CONN_ID Idx, REQUEST *Req, bool *Closed ));
|
|
static bool Validate_Command PARAMS(( CONN_ID Idx, REQUEST *Req, bool *Closed ));
|
|
static bool Validate_Args PARAMS(( CONN_ID Idx, REQUEST *Req, bool *Closed ));
|
|
|
|
static bool Handle_Request PARAMS(( CONN_ID Idx, REQUEST *Req ));
|
|
|
|
|
|
/**
|
|
* Return the pointer to the global "IRC command structure".
|
|
* This structure, an array of type "COMMAND" describes all the IRC commands
|
|
* implemented by ngIRCd and how to handle them.
|
|
* @return Pointer to the global command structure.
|
|
*/
|
|
GLOBAL COMMAND *
|
|
Parse_GetCommandStruct( void )
|
|
{
|
|
return My_Commands;
|
|
} /* Parse_GetCommandStruct */
|
|
|
|
|
|
/**
|
|
* Parse a command ("request") received from a client.
|
|
*
|
|
* This function is called after the connection layer received a valid CR+LF
|
|
* terminated line of text: we asume that this is a valid IRC command and
|
|
* try to do something useful with it :-)
|
|
*
|
|
* All errors are reported to the client from which the command has been
|
|
* received, and if the error is fatal this connection is closed down.
|
|
*
|
|
* This function is able to parse the syntax as described in RFC 2812,
|
|
* section 2.3.
|
|
*
|
|
* @param Idx Index of the connection from which the command has been received.
|
|
* @param Request NULL terminated line of text (the "command").
|
|
* @return true on success (valid command or "regular" error), false if a
|
|
* fatal error occured and the connection has been shut down.
|
|
*/
|
|
GLOBAL bool
|
|
Parse_Request( CONN_ID Idx, char *Request )
|
|
{
|
|
REQUEST req;
|
|
char *start, *ptr;
|
|
bool closed;
|
|
|
|
assert( Idx >= 0 );
|
|
assert( Request != NULL );
|
|
|
|
#ifdef SNIFFER
|
|
if( NGIRCd_Sniffer ) Log( LOG_DEBUG, " <- connection %d: '%s'.", Idx, Request );
|
|
#endif
|
|
|
|
Init_Request( &req );
|
|
|
|
/* Fuehrendes und folgendes "Geraffel" verwerfen */
|
|
ngt_TrimStr( Request );
|
|
|
|
/* gibt es ein Prefix? */
|
|
if( Request[0] == ':' )
|
|
{
|
|
/* Prefix vorhanden */
|
|
req.prefix = Request + 1;
|
|
ptr = strchr( Request, ' ' );
|
|
if( ! ptr )
|
|
{
|
|
Log( LOG_DEBUG, "Connection %d: Parse error: prefix without command!?", Idx );
|
|
return Conn_WriteStr( Idx, "ERROR :Prefix without command!?" );
|
|
}
|
|
*ptr = '\0';
|
|
#ifndef STRICT_RFC
|
|
/* multiple Leerzeichen als Trenner zwischen
|
|
* Prefix und Befehl ignorieren */
|
|
while( *(ptr + 1) == ' ' ) ptr++;
|
|
#endif
|
|
start = ptr + 1;
|
|
}
|
|
else start = Request;
|
|
|
|
/* Befehl */
|
|
ptr = strchr( start, ' ' );
|
|
if( ptr )
|
|
{
|
|
*ptr = '\0';
|
|
#ifndef STRICT_RFC
|
|
/* multiple Leerzeichen als Trenner vor
|
|
* Parametern ignorieren */
|
|
while( *(ptr + 1) == ' ' ) ptr++;
|
|
#endif
|
|
}
|
|
req.command = start;
|
|
|
|
/* Argumente, Parameter */
|
|
if( ptr )
|
|
{
|
|
/* Prinzipiell gibt es welche :-) */
|
|
start = ptr + 1;
|
|
while( start )
|
|
{
|
|
/* Parameter-String "zerlegen" */
|
|
if( start[0] == ':' )
|
|
{
|
|
req.argv[req.argc] = start + 1;
|
|
ptr = NULL;
|
|
}
|
|
else
|
|
{
|
|
req.argv[req.argc] = start;
|
|
ptr = strchr( start, ' ' );
|
|
if( ptr )
|
|
{
|
|
*ptr = '\0';
|
|
#ifndef STRICT_RFC
|
|
/* multiple Leerzeichen als
|
|
* Parametertrenner ignorieren */
|
|
while( *(ptr + 1) == ' ' ) ptr++;
|
|
#endif
|
|
}
|
|
}
|
|
|
|
req.argc++;
|
|
|
|
if( start[0] == ':' ) break;
|
|
if( req.argc > 14 ) break;
|
|
|
|
if( ptr ) start = ptr + 1;
|
|
else start = NULL;
|
|
}
|
|
}
|
|
|
|
/* Daten validieren */
|
|
if( ! Validate_Prefix( Idx, &req, &closed )) return ! closed;
|
|
if( ! Validate_Command( Idx, &req, &closed )) return ! closed;
|
|
if( ! Validate_Args( Idx, &req, &closed )) return ! closed;
|
|
|
|
return Handle_Request( Idx, &req );
|
|
} /* Parse_Request */
|
|
|
|
|
|
/**
|
|
* Initialize request structure.
|
|
* @param Req Request structure to be initialized.
|
|
*/
|
|
static void
|
|
Init_Request( REQUEST *Req )
|
|
{
|
|
/* Neue Request-Struktur initialisieren */
|
|
|
|
int i;
|
|
|
|
assert( Req != NULL );
|
|
|
|
Req->prefix = NULL;
|
|
Req->command = NULL;
|
|
for( i = 0; i < 15; Req->argv[i++] = NULL );
|
|
Req->argc = 0;
|
|
} /* Init_Request */
|
|
|
|
|
|
static bool
|
|
Validate_Prefix( CONN_ID Idx, REQUEST *Req, bool *Closed )
|
|
{
|
|
CLIENT *client, *c;
|
|
|
|
assert( Idx >= 0 );
|
|
assert( Req != NULL );
|
|
|
|
*Closed = false;
|
|
|
|
/* ist ueberhaupt ein Prefix vorhanden? */
|
|
if( ! Req->prefix ) return true;
|
|
|
|
/* Client-Struktur der Connection ermitteln */
|
|
client = Conn_GetClient( Idx );
|
|
assert( client != NULL );
|
|
|
|
/* nur validieren, wenn bereits registrierte Verbindung */
|
|
if(( Client_Type( client ) != CLIENT_USER ) && ( Client_Type( client ) != CLIENT_SERVER ) && ( Client_Type( client ) != CLIENT_SERVICE ))
|
|
{
|
|
/* noch nicht registrierte Verbindung.
|
|
* Das Prefix wird ignoriert. */
|
|
Req->prefix = NULL;
|
|
return true;
|
|
}
|
|
|
|
/* pruefen, ob der im Prefix angegebene Client bekannt ist */
|
|
c = Client_Search( Req->prefix );
|
|
if( ! c )
|
|
{
|
|
/* im Prefix angegebener Client ist nicht bekannt */
|
|
Log( LOG_ERR, "Invalid prefix \"%s\", client not known (connection %d, command %s)!?", Req->prefix, Idx, Req->command );
|
|
if( ! Conn_WriteStr( Idx, "ERROR :Invalid prefix \"%s\", client not known!?", Req->prefix )) *Closed = true;
|
|
return false;
|
|
}
|
|
|
|
/* pruefen, ob der Client mit dem angegebenen Prefix in Richtung
|
|
* des Senders liegt, d.h. sicherstellen, dass das Prefix nicht
|
|
* gefaelscht ist */
|
|
if( Client_NextHop( c ) != client )
|
|
{
|
|
/* das angegebene Prefix ist aus dieser Richtung, also
|
|
* aus der gegebenen Connection, ungueltig! */
|
|
Log( LOG_ERR, "Spoofed prefix \"%s\" from \"%s\" (connection %d, command %s)!", Req->prefix, Client_Mask( Conn_GetClient( Idx )), Idx, Req->command );
|
|
Conn_Close( Idx, NULL, "Spoofed prefix", true);
|
|
*Closed = true;
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
} /* Validate_Prefix */
|
|
|
|
|
|
static bool
|
|
Validate_Command( UNUSED CONN_ID Idx, UNUSED REQUEST *Req, bool *Closed )
|
|
{
|
|
assert( Idx >= 0 );
|
|
assert( Req != NULL );
|
|
*Closed = false;
|
|
|
|
return true;
|
|
} /* Validate_Comman */
|
|
|
|
|
|
static bool
|
|
Validate_Args( UNUSED CONN_ID Idx, UNUSED REQUEST *Req, bool *Closed )
|
|
{
|
|
assert( Idx >= 0 );
|
|
assert( Req != NULL );
|
|
*Closed = false;
|
|
|
|
return true;
|
|
} /* Validate_Args */
|
|
|
|
|
|
static bool
|
|
Handle_Request( CONN_ID Idx, REQUEST *Req )
|
|
{
|
|
/* Client-Request verarbeiten. Bei einem schwerwiegenden Fehler
|
|
* wird die Verbindung geschlossen und false geliefert. */
|
|
|
|
CLIENT *client, *target, *prefix;
|
|
char str[LINE_LEN];
|
|
bool result;
|
|
COMMAND *cmd;
|
|
NUMERIC *num;
|
|
int i;
|
|
|
|
assert( Idx >= 0 );
|
|
assert( Req != NULL );
|
|
assert( Req->command != NULL );
|
|
|
|
client = Conn_GetClient( Idx );
|
|
assert( client != NULL );
|
|
|
|
/* Numeric? */
|
|
if ((Client_Type(client) == CLIENT_SERVER ||
|
|
Client_Type(client) == CLIENT_UNKNOWNSERVER)
|
|
&& strlen(Req->command) == 3 && atoi(Req->command) > 1) {
|
|
/* Command is a status code ("numeric") from an other server */
|
|
|
|
/* Determine target */
|
|
if (Req->argc > 0)
|
|
target = Client_Search( Req->argv[0] );
|
|
else
|
|
target = NULL;
|
|
if (!target) {
|
|
/* Status code without target!? */
|
|
if (Req->argc > 0)
|
|
Log(LOG_WARNING,
|
|
"Unknown target for status code %s: \"%s\"",
|
|
Req->command, Req->argv[0]);
|
|
else
|
|
Log(LOG_WARNING,
|
|
"Unknown target for status code %s!",
|
|
Req->command);
|
|
return true;
|
|
}
|
|
if (target == Client_ThisServer()) {
|
|
/* This server is the target of the numeric */
|
|
i = atoi(Req->command);
|
|
|
|
num = My_Numerics;
|
|
while (num->numeric > 0) {
|
|
if (i != num->numeric) {
|
|
num++;
|
|
continue;
|
|
}
|
|
result = (num->function)(client, Req);
|
|
return result;
|
|
}
|
|
|
|
LogDebug("Ignored status code %s from \"%s\".",
|
|
Req->command, Client_ID(client));
|
|
return true;
|
|
}
|
|
|
|
/* Determine source */
|
|
if( ! Req->prefix[0] )
|
|
{
|
|
/* Oops, no prefix!? */
|
|
Log( LOG_WARNING, "Got status code %s from \"%s\" without prefix!?", Req->command, Client_ID( client ));
|
|
return true;
|
|
}
|
|
else prefix = Client_Search( Req->prefix );
|
|
if( ! prefix )
|
|
{
|
|
/* Oops, unknown prefix!? */
|
|
Log( LOG_WARNING, "Got status code %s from unknown source: \"%s\"", Req->command, Req->prefix );
|
|
return true;
|
|
}
|
|
|
|
/* Forward status code */
|
|
strlcpy( str, Req->command, sizeof( str ));
|
|
for( i = 0; i < Req->argc; i++ )
|
|
{
|
|
if( i < Req->argc - 1 ) strlcat( str, " ", sizeof( str ));
|
|
else strlcat( str, " :", sizeof( str ));
|
|
strlcat( str, Req->argv[i], sizeof( str ));
|
|
}
|
|
return IRC_WriteStrClientPrefix( target, prefix, "%s", str );
|
|
}
|
|
|
|
cmd = My_Commands;
|
|
while( cmd->name )
|
|
{
|
|
/* Befehl suchen */
|
|
if( strcasecmp( Req->command, cmd->name ) != 0 )
|
|
{
|
|
cmd++; continue;
|
|
}
|
|
|
|
if( Client_Type( client ) & cmd->type )
|
|
{
|
|
/* Command is allowed for this client: call it and count produced bytes */
|
|
Conn_ResetWCounter( );
|
|
result = (cmd->function)( client, Req );
|
|
cmd->bytes += Conn_WCounter( );
|
|
|
|
/* Adjust counters */
|
|
if( Client_Type( client ) != CLIENT_SERVER ) cmd->lcount++;
|
|
else cmd->rcount++;
|
|
|
|
return result;
|
|
}
|
|
else
|
|
{
|
|
/* Befehl ist fuer diesen Client-Typ nicht erlaubt! */
|
|
return IRC_WriteStrClient( client, ERR_NOTREGISTERED_MSG, Client_ID( client ));
|
|
}
|
|
}
|
|
|
|
if( Client_Type( client ) != CLIENT_USER &&
|
|
Client_Type( client ) != CLIENT_SERVER &&
|
|
Client_Type( client ) != CLIENT_SERVICE )
|
|
return true;
|
|
|
|
/* Unknown command and registered connection: generate error: */
|
|
Log( LOG_DEBUG, "Connection %d: Unknown command \"%s\", %d %s,%s prefix.",
|
|
Client_Conn( client ), Req->command, Req->argc,
|
|
Req->argc == 1 ? "parameter" : "parameters",
|
|
Req->prefix ? "" : " no" );
|
|
|
|
if (Client_Type(client) != CLIENT_SERVER) {
|
|
result = IRC_WriteStrClient(client, ERR_UNKNOWNCOMMAND_MSG,
|
|
Client_ID(client), Req->command);
|
|
Conn_SetPenalty(Idx, 1);
|
|
return result;
|
|
}
|
|
|
|
return true;
|
|
} /* Handle_Request */
|
|
|
|
|
|
/* -eof- */
|