586 lines
15 KiB
C
586 lines
15 KiB
C
/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001-2010 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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#include "portab.h"
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/**
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* @file
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* IRC command parser and validator.
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*/
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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 <strings.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 "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-cap.h"
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#include "irc-channel.h"
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#include "irc-encoding.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 "numeric.h"
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#include "exp.h"
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#include "conf.h"
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struct _NUMERIC {
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int numeric;
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bool (*function) PARAMS(( CLIENT *Client, REQUEST *Request ));
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};
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static 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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{ "CAP", IRC_CAP, 0xFFFF, 0, 0, 0 },
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{ "CONNECT", IRC_CONNECT, CLIENT_USER|CLIENT_SERVER, 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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{ "GLINE", IRC_xLINE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "HELP", IRC_HELP, CLIENT_USER, 0, 0, 0 },
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{ "INFO", IRC_INFO, CLIENT_USER|CLIENT_SERVER, 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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{ "KLINE", IRC_xLINE, 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, 0xFFFF, 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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{ "SERVICE", IRC_SERVICE, 0xFFFF, 0, 0, 0 },
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{ "SERVLIST", IRC_SERVLIST, CLIENT_USER, 0, 0, 0 },
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{ "SQUERY", IRC_SQUERY, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "SQUIT", IRC_SQUIT, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "STATS", IRC_STATS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "SUMMON", IRC_SUMMON, 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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{ "USERS", IRC_USERS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "VERSION", IRC_VERSION, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "WALLOPS", IRC_WALLOPS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
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{ "WEBIRC", IRC_WEBIRC, CLIENT_UNKNOWN, 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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# ifdef ICONV
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{ "CHARCONV", IRC_CHARCONV, CLIENT_USER, 0, 0, 0 },
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# endif
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#endif
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#ifndef STRICT_RFC
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{ "GET", IRC_QUIT_HTTP, CLIENT_UNKNOWN, 0, 0, 0 },
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{ "POST", IRC_QUIT_HTTP, CLIENT_UNKNOWN, 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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static void Init_Request PARAMS(( REQUEST *Req ));
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static bool Validate_Prefix PARAMS(( CONN_ID Idx, REQUEST *Req, bool *Closed ));
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static bool Validate_Command PARAMS(( CONN_ID Idx, REQUEST *Req, bool *Closed ));
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static bool Validate_Args PARAMS(( CONN_ID Idx, REQUEST *Req, bool *Closed ));
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static bool Handle_Request PARAMS(( CONN_ID Idx, REQUEST *Req ));
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static bool ScrubCTCP PARAMS((char *Request));
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/**
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* Return the pointer to the global "IRC command structure".
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* This structure, an array of type "COMMAND" describes all the IRC commands
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* implemented by ngIRCd and how to handle them.
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* @return Pointer to the global command structure.
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*/
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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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/**
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* Parse a command ("request") received from a client.
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*
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* This function is called after the connection layer received a valid CR+LF
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* terminated line of text: we asume that this is a valid IRC command and
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* try to do something useful with it :-)
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*
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* All errors are reported to the client from which the command has been
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* received, and if the error is fatal this connection is closed down.
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*
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* This function is able to parse the syntax as described in RFC 2812,
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* section 2.3.
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*
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* @param Idx Index of the connection from which the command has been received.
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* @param Request NULL terminated line of text (the "command").
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* @return true on success (valid command or "regular" error), false if a
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* fatal error occured and the connection has been shut down.
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*/
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GLOBAL bool
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Parse_Request( CONN_ID Idx, char *Request )
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{
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REQUEST req;
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char *start, *ptr;
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bool 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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/* remove leading & trailing whitespace */
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ngt_TrimStr( Request );
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if (Conf_ScrubCTCP && ScrubCTCP(Request))
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return true;
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if (Request[0] == ':') {
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/* Prefix */
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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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LogDebug("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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/* ignore multiple spaces between prefix and command */
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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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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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/* ignore multiple spaces between parameters */
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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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/* Arguments, Parameters */
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if( ptr )
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{
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start = ptr + 1;
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while( start )
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{
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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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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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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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/**
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* Initialize request structure.
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* @param Req Request structure to be initialized.
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*/
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static 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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static bool
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Validate_Prefix( CONN_ID Idx, REQUEST *Req, bool *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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client = Conn_GetClient( Idx );
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assert( client != NULL );
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if (!Req->prefix && Client_Type(client) == CLIENT_SERVER
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&& !(Conn_Options(Idx) & CONN_RFC1459)
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&& strcasecmp(Req->command, "ERROR") != 0
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&& strcasecmp(Req->command, "PING") != 0)
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{
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Log(LOG_ERR,
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"Received command without prefix (connection %d, command \"%s\")!?",
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Idx, Req->command);
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if (!Conn_WriteStr(Idx, "ERROR :Prefix missing"))
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*Closed = true;
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return false;
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}
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if (!Req->prefix)
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return true;
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/* only validate if this connection is already registered */
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if (Client_Type(client) != CLIENT_USER
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&& Client_Type(client) != CLIENT_SERVER
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&& Client_Type(client) != CLIENT_SERVICE) {
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/* not registered, ignore prefix */
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Req->prefix = NULL;
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return true;
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}
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/* check if client in prefix is known */
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c = Client_Search( Req->prefix );
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if (!c) {
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Log(LOG_ERR,
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"Invalid prefix \"%s\", client not known (connection %d, command \"%s\")!?",
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Req->prefix, Idx, Req->command);
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if (!Conn_WriteStr(Idx,
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"ERROR :Invalid prefix \"%s\", client not known",
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Req->prefix))
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*Closed = true;
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return false;
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}
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/* check if the client named in the prefix is expected
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* to come from that direction */
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if (Client_NextHop(c) != client) {
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if (Client_Type(c) != CLIENT_SERVER) {
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Log(LOG_ERR,
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"Spoofed prefix \"%s\" from \"%s\" (connection %d, command \"%s\")!",
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Req->prefix, Client_Mask(Conn_GetClient(Idx)), Idx,
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Req->command);
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Conn_Close(Idx, NULL, "Spoofed prefix", true);
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*Closed = true;
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} else {
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Log(LOG_INFO,
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"Ignoring spoofed prefix \"%s\" from \"%s\" (connection %d, command \"%s\").",
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Req->prefix, Client_Mask(Conn_GetClient(Idx)), Idx,
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Req->command);
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}
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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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static bool
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Validate_Command( UNUSED CONN_ID Idx, UNUSED REQUEST *Req, bool *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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static bool
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#ifdef STRICT_RFC
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Validate_Args(CONN_ID Idx, REQUEST *Req, bool *Closed)
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#else
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Validate_Args(UNUSED CONN_ID Idx, UNUSED REQUEST *Req, bool *Closed)
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#endif
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{
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#ifdef STRICT_RFC
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int i;
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#endif
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*Closed = false;
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#ifdef STRICT_RFC
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assert( Idx >= 0 );
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assert( Req != NULL );
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/* CR and LF are never allowed in command parameters.
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* But since we do accept lines terminated only with CR or LF in
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* "non-RFC-compliant mode" (besides the correct CR+LF combination),
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* this check can only trigger in "strict RFC" mode; therefore we
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* optimize it away otherwise ... */
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for (i = 0; i < Req->argc; i++) {
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if (strchr(Req->argv[i], '\r') || strchr(Req->argv[i], '\n')) {
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Log(LOG_ERR,
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"Invalid character(s) in parameter (connection %d, command %s)!?",
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Idx, Req->command);
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if (!Conn_WriteStr(Idx,
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"ERROR :Invalid character(s) in parameter!"))
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*Closed = true;
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return false;
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}
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}
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#endif
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return true;
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} /* Validate_Args */
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/* Command is a status code ("numeric") from another server */
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static bool
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Handle_Numeric(CLIENT *client, REQUEST *Req)
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{
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static const struct _NUMERIC Numerics[] = {
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{ 5, IRC_Num_ISUPPORT },
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{ 20, NULL },
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{ 376, IRC_Num_ENDOFMOTD }
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};
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int i, num;
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char str[LINE_LEN];
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CLIENT *prefix, *target = NULL;
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/* Determine target */
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if (Req->argc > 0) {
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if (strcmp(Req->argv[0], "*") != 0)
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target = Client_Search(Req->argv[0]);
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else
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target = Client_ThisServer();
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}
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if (!target) {
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/* Status code without target!? */
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if (Req->argc > 0)
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Log(LOG_WARNING,
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"Unknown target for status code %s: \"%s\"",
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Req->command, Req->argv[0]);
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else
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Log(LOG_WARNING,
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"Unknown target for status code %s!",
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Req->command);
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return true;
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}
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if (target == Client_ThisServer()) {
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/* This server is the target of the numeric */
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num = atoi(Req->command);
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for (i = 0; i < (int) C_ARRAY_SIZE(Numerics); i++) {
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if (num == Numerics[i].numeric) {
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if (!Numerics[i].function)
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return CONNECTED;
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return Numerics[i].function(client, Req);
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}
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}
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LogDebug("Ignored status code %s from \"%s\".",
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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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/* Oops, no prefix!? */
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Log(LOG_WARNING, "Got status code %s from \"%s\" without prefix!?",
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Req->command, Client_ID(client));
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return true;
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}
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prefix = Client_Search(Req->prefix);
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if (! prefix) { /* 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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if (i < Req->argc - 1)
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strlcat(str, " ", sizeof(str));
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else
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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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static bool
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Handle_Request( CONN_ID Idx, REQUEST *Req )
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{
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CLIENT *client;
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bool result = true;
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int client_type;
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COMMAND *cmd;
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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 = Conn_GetClient( Idx );
|
|
assert( client != NULL );
|
|
|
|
/* Numeric? */
|
|
client_type = Client_Type(client);
|
|
if ((client_type == CLIENT_SERVER ||
|
|
client_type == CLIENT_UNKNOWNSERVER)
|
|
&& strlen(Req->command) == 3 && atoi(Req->command) > 1)
|
|
return Handle_Numeric(client, Req);
|
|
|
|
cmd = My_Commands;
|
|
while (cmd->name) {
|
|
if (strcasecmp(Req->command, cmd->name) != 0) {
|
|
cmd++;
|
|
continue;
|
|
}
|
|
|
|
if (!(client_type & cmd->type))
|
|
return IRC_WriteStrClient(client, ERR_NOTREGISTERED_MSG, Client_ID(client));
|
|
|
|
/* 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_SERVER)
|
|
cmd->lcount++;
|
|
else
|
|
cmd->rcount++;
|
|
return result;
|
|
}
|
|
|
|
if (client_type != CLIENT_USER &&
|
|
client_type != CLIENT_SERVER &&
|
|
client_type != CLIENT_SERVICE )
|
|
return true;
|
|
|
|
/* Unknown command and registered connection: generate error: */
|
|
LogDebug("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;
|
|
} /* Handle_Request */
|
|
|
|
|
|
/**
|
|
* Check if incoming messages contains CTCP commands and should be dropped.
|
|
*
|
|
* @param Request NULL terminated incoming command.
|
|
* @returns true, when the message should be dropped.
|
|
*/
|
|
static bool
|
|
ScrubCTCP(char *Request)
|
|
{
|
|
static const char me_cmd[] = "ACTION ";
|
|
static const char ctcp_char = 0x1;
|
|
bool dropCommand = false;
|
|
char *ptr = Request;
|
|
char *ptrEnd = strchr(Request, '\0');
|
|
|
|
if (Request[0] == ':' && ptrEnd > ptr)
|
|
ptr++;
|
|
|
|
while (ptr != ptrEnd && *ptr != ':')
|
|
ptr++;
|
|
|
|
if ((ptrEnd - ptr) > 1) {
|
|
ptr++;
|
|
if (*ptr == ctcp_char) {
|
|
dropCommand = true;
|
|
ptr++;
|
|
/* allow /me commands */
|
|
if ((size_t)(ptrEnd - ptr) >= strlen(me_cmd)
|
|
&& !strncmp(ptr, me_cmd, strlen(me_cmd)))
|
|
dropCommand = false;
|
|
}
|
|
}
|
|
return dropCommand;
|
|
}
|
|
|
|
/* -eof- */
|