416 lines
11 KiB
C
416 lines
11 KiB
C
/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* Please read the file COPYING, README and AUTHORS for more information.
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*
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* IRC command parser and validator
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*/
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#include "portab.h"
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static char UNUSED id[] = "$Id: parse.c,v 1.58 2003/01/13 18:56:30 alex Exp $";
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#include "imp.h"
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#include <assert.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include "ngircd.h"
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#include "defines.h"
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#include "conn-func.h"
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#include "client.h"
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#include "channel.h"
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#include "log.h"
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#include "messages.h"
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#include "tool.h"
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#include "exp.h"
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#include "parse.h"
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#include "imp.h"
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#include "irc.h"
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#include "irc-channel.h"
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#include "irc-info.h"
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#include "irc-login.h"
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#include "irc-mode.h"
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#include "irc-op.h"
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#include "irc-oper.h"
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#include "irc-server.h"
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#include "irc-write.h"
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#include "exp.h"
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COMMAND My_Commands[] =
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{
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{ "ADMIN", IRC_ADMIN, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "AWAY", IRC_AWAY, CLIENT_USER, 0, 0, 0 },
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{ "CONNECT", IRC_CONNECT, CLIENT_USER, 0, 0, 0 },
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{ "DIE", IRC_DIE, CLIENT_USER, 0, 0, 0 },
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{ "DISCONNECT", IRC_DISCONNECT, CLIENT_USER, 0, 0, 0 },
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{ "ERROR", IRC_ERROR, 0xFFFF, 0, 0, 0 },
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{ "INVITE", IRC_INVITE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "ISON", IRC_ISON, CLIENT_USER, 0, 0, 0 },
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{ "JOIN", IRC_JOIN, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "KICK", IRC_KICK, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "KILL", IRC_KILL, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "LINKS", IRC_LINKS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "LIST", IRC_LIST, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "LUSERS", IRC_LUSERS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "MODE", IRC_MODE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "MOTD", IRC_MOTD, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "NAMES", IRC_NAMES, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "NICK", IRC_NICK, 0xFFFF, 0, 0, 0 },
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{ "NJOIN", IRC_NJOIN, CLIENT_SERVER, 0, 0, 0 },
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{ "NOTICE", IRC_NOTICE, 0xFFFF, 0, 0, 0 },
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{ "OPER", IRC_OPER, CLIENT_USER, 0, 0, 0 },
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{ "PART", IRC_PART, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "PASS", IRC_PASS, 0xFFFF, 0, 0, 0 },
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{ "PING", IRC_PING, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "PONG", IRC_PONG, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "PRIVMSG", IRC_PRIVMSG, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "QUIT", IRC_QUIT, 0xFFFF, 0, 0, 0 },
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{ "REHASH", IRC_REHASH, CLIENT_USER, 0, 0, 0 },
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{ "RESTART", IRC_RESTART, CLIENT_USER, 0, 0, 0 },
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{ "SERVER", IRC_SERVER, 0xFFFF, 0, 0, 0 },
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{ "SQUIT", IRC_SQUIT, CLIENT_SERVER, 0, 0, 0 },
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{ "STATS", IRC_STATS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "TIME", IRC_TIME, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "TOPIC", IRC_TOPIC, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "TRACE", IRC_TRACE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "USER", IRC_USER, 0xFFFF, 0, 0, 0 },
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{ "USERHOST", IRC_USERHOST, CLIENT_USER, 0, 0, 0 },
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{ "VERSION", IRC_VERSION, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "WHO", IRC_WHO, CLIENT_USER, 0, 0, 0 },
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{ "WHOIS", IRC_WHOIS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "WHOWAS", IRC_WHOWAS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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#ifdef IRCPLUS
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{ "CHANINFO", IRC_CHANINFO, CLIENT_SERVER, 0, 0, 0 },
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#endif
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{ NULL, NULL, 0x0, 0, 0, 0 } /* Ende-Marke */
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};
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LOCAL VOID Init_Request PARAMS(( REQUEST *Req ));
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LOCAL BOOLEAN Validate_Prefix PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ));
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LOCAL BOOLEAN Validate_Command PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ));
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LOCAL BOOLEAN Validate_Args PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ));
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LOCAL BOOLEAN Handle_Request PARAMS(( CONN_ID Idx, REQUEST *Req ));
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GLOBAL COMMAND *
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Parse_GetCommandStruct( VOID )
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{
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return My_Commands;
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} /* Parse_GetCommandStruct */
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GLOBAL BOOLEAN
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Parse_Request( CONN_ID Idx, CHAR *Request )
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{
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/* Client-Request parsen. Bei einem schwerwiegenden Fehler wird
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* die Verbindung geschlossen und FALSE geliefert.
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* Der Aufbau gueltiger Requests ist in RFC 2812, 2.3 definiert. */
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REQUEST req;
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CHAR *start, *ptr;
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BOOLEAN closed;
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assert( Idx >= 0 );
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assert( Request != NULL );
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#ifdef SNIFFER
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if( NGIRCd_Sniffer ) Log( LOG_DEBUG, " <- connection %d: '%s'.", Idx, Request );
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#endif
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Init_Request( &req );
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/* Fuehrendes und folgendes "Geraffel" verwerfen */
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ngt_TrimStr( Request );
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/* gibt es ein Prefix? */
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if( Request[0] == ':' )
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{
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/* Prefix vorhanden */
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req.prefix = Request + 1;
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ptr = strchr( Request, ' ' );
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if( ! ptr )
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{
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Log( LOG_DEBUG, "Connection %d: Parse error: prefix without command!?", Idx );
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return Conn_WriteStr( Idx, "ERROR :Prefix without command!?" );
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}
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*ptr = '\0';
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#ifndef STRICT_RFC
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/* multiple Leerzeichen als Trenner zwischen
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* Prefix und Befehl ignorieren */
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while( *(ptr + 1) == ' ' ) ptr++;
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#endif
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start = ptr + 1;
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}
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else start = Request;
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/* Befehl */
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ptr = strchr( start, ' ' );
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if( ptr )
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{
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*ptr = '\0';
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#ifndef STRICT_RFC
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/* multiple Leerzeichen als Trenner vor
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* Parametern ignorieren */
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while( *(ptr + 1) == ' ' ) ptr++;
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#endif
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}
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req.command = start;
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/* Argumente, Parameter */
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if( ptr )
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{
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/* Prinzipiell gibt es welche :-) */
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start = ptr + 1;
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while( start )
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{
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/* Parameter-String "zerlegen" */
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if( start[0] == ':' )
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{
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req.argv[req.argc] = start + 1;
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ptr = NULL;
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}
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else
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{
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req.argv[req.argc] = start;
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ptr = strchr( start, ' ' );
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if( ptr )
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{
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*ptr = '\0';
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#ifndef STRICT_RFC
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/* multiple Leerzeichen als
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* Parametertrenner ignorieren */
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while( *(ptr + 1) == ' ' ) ptr++;
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#endif
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}
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}
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req.argc++;
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if( start[0] == ':' ) break;
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if( req.argc > 14 ) break;
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if( ptr ) start = ptr + 1;
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else start = NULL;
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}
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}
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/* Daten validieren */
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if( ! Validate_Prefix( Idx, &req, &closed )) return ! closed;
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if( ! Validate_Command( Idx, &req, &closed )) return ! closed;
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if( ! Validate_Args( Idx, &req, &closed )) return ! closed;
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return Handle_Request( Idx, &req );
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} /* Parse_Request */
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LOCAL VOID
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Init_Request( REQUEST *Req )
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{
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/* Neue Request-Struktur initialisieren */
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INT i;
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assert( Req != NULL );
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Req->prefix = NULL;
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Req->command = NULL;
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for( i = 0; i < 15; Req->argv[i++] = NULL );
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Req->argc = 0;
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} /* Init_Request */
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LOCAL BOOLEAN
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Validate_Prefix( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
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{
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CLIENT *client, *c;
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assert( Idx >= 0 );
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assert( Req != NULL );
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*Closed = FALSE;
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/* ist ueberhaupt ein Prefix vorhanden? */
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if( ! Req->prefix ) return TRUE;
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/* Client-Struktur der Connection ermitteln */
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client = Client_GetFromConn( Idx );
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assert( client != NULL );
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/* nur validieren, wenn bereits registrierte Verbindung */
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if(( Client_Type( client ) != CLIENT_USER ) && ( Client_Type( client ) != CLIENT_SERVER ) && ( Client_Type( client ) != CLIENT_SERVICE ))
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{
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/* noch nicht registrierte Verbindung.
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* Das Prefix wird ignoriert. */
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Req->prefix = NULL;
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return TRUE;
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}
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/* pruefen, ob der im Prefix angegebene Client bekannt ist */
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c = Client_Search( Req->prefix );
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if( ! c )
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{
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/* im Prefix angegebener Client ist nicht bekannt */
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Log( LOG_ERR, "Invalid prefix \"%s\", client not known (connection %d, command %s)!?", Req->prefix, Idx, Req->command );
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if( ! Conn_WriteStr( Idx, "ERROR :Invalid prefix \"%s\", client not known!?", Req->prefix )) *Closed = TRUE;
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return FALSE;
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}
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/* pruefen, ob der Client mit dem angegebenen Prefix in Richtung
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* des Senders liegt, d.h. sicherstellen, dass das Prefix nicht
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* gefaelscht ist */
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if( Client_NextHop( c ) != client )
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{
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/* das angegebene Prefix ist aus dieser Richtung, also
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* aus der gegebenen Connection, ungueltig! */
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Log( LOG_ERR, "Spoofed prefix \"%s\" from \"%s\" (connection %d, command %s)!", Req->prefix, Client_Mask( Client_GetFromConn( Idx )), Idx, Req->command );
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Conn_Close( Idx, NULL, "Spoofed prefix", TRUE );
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*Closed = TRUE;
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return FALSE;
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}
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return TRUE;
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} /* Validate_Prefix */
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LOCAL BOOLEAN
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Validate_Command( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
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{
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assert( Idx >= 0 );
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assert( Req != NULL );
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*Closed = FALSE;
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return TRUE;
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} /* Validate_Comman */
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LOCAL BOOLEAN
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Validate_Args( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
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{
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assert( Idx >= 0 );
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assert( Req != NULL );
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*Closed = FALSE;
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return TRUE;
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} /* Validate_Args */
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LOCAL BOOLEAN
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Handle_Request( CONN_ID Idx, REQUEST *Req )
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{
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/* Client-Request verarbeiten. Bei einem schwerwiegenden Fehler
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* wird die Verbindung geschlossen und FALSE geliefert. */
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CLIENT *client, *target, *prefix;
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CHAR str[LINE_LEN];
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BOOLEAN result;
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COMMAND *cmd;
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INT i;
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assert( Idx >= 0 );
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assert( Req != NULL );
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assert( Req->command != NULL );
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client = Client_GetFromConn( Idx );
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assert( client != NULL );
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/* Statuscode? */
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if(( Client_Type( client ) == CLIENT_SERVER ) && ( strlen( Req->command ) == 3 ) && ( atoi( Req->command ) > 100 ))
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{
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/* Command is a status code from an other server */
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/* Determine target */
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if( Req->argc > 0 ) target = Client_Search( Req->argv[0] );
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else target = NULL;
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if( ! target )
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{
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/* Status code without target!? */
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if( Req->argc > 0 ) Log( LOG_WARNING, "Unknown target for status code %s: \"%s\"", Req->command, Req->argv[0] );
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else Log( LOG_WARNING, "Unknown target for status code %s!", Req->command );
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return TRUE;
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}
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if( target == Client_ThisServer( ))
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{
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/* This server is the target, ignore it */
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Log( LOG_DEBUG, "Ignored status code %s from \"%s\".", Req->command, Client_ID( client ));
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return TRUE;
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}
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/* Determine source */
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if( ! Req->prefix[0] )
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{
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/* Oops, no prefix!? */
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Log( LOG_WARNING, "Got status code %s from \"%s\" without prefix!?", Req->command, Client_ID( client ));
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return TRUE;
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}
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else prefix = Client_Search( Req->prefix );
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if( ! prefix )
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{
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/* Oops, unknown prefix!? */
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Log( LOG_WARNING, "Got status code %s from unknown source: \"%s\"", Req->command, Req->prefix );
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return TRUE;
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}
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/* Forward status code */
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strlcpy( str, Req->command, sizeof( str ));
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for( i = 0; i < Req->argc; i++ )
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{
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if( i < Req->argc - 1 ) strlcat( str, " ", sizeof( str ));
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else strlcat( str, " :", sizeof( str ));
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strlcat( str, Req->argv[i], sizeof( str ));
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}
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return IRC_WriteStrClientPrefix( target, prefix, "%s", str );
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}
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cmd = My_Commands;
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while( cmd->name )
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{
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/* Befehl suchen */
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if( strcasecmp( Req->command, cmd->name ) != 0 )
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{
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cmd++; continue;
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}
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if( Client_Type( client ) & cmd->type )
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{
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/* Command is allowed for this client: call it and count produced bytes */
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Conn_ResetWCounter( );
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result = (cmd->function)( client, Req );
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cmd->bytes += Conn_WCounter( );
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/* Adjust counters */
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if( Client_Type( client ) != CLIENT_SERVER ) cmd->lcount++;
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else cmd->rcount++;
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return result;
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}
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else
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{
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/* Befehl ist fuer diesen Client-Typ nicht erlaubt! */
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return IRC_WriteStrClient( client, ERR_NOTREGISTERED_MSG, Client_ID( client ));
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}
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}
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/* Unbekannter Befehl */
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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" );
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if( Client_Type( client ) != CLIENT_SERVER ) return IRC_WriteStrClient( client, ERR_UNKNOWNCOMMAND_MSG, Client_ID( client ), Req->command );
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else return TRUE;
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} /* Handle_Request */
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/* -eof- */
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