X-Git-Url: https://arthur.barton.de/cgi-bin/gitweb.cgi?p=ngircd-alex.git;a=blobdiff_plain;f=src%2Fngircd%2Fparse.c;h=7172f411b64c3dbf810c0052eb3ed2ed86a04987;hp=08d47f11494a96c9780d7314b5f800c2143375ff;hb=08f9d31d60220e8a389a2d24f42625be7749f090;hpb=42c4e6c7b19f4ebc1cbf9fb5d8d39407411a8c78 diff --git a/src/ngircd/parse.c b/src/ngircd/parse.c index 08d47f11..7172f411 100644 --- a/src/ngircd/parse.c +++ b/src/ngircd/parse.c @@ -1,31 +1,31 @@ /* * ngIRCd -- The Next Generation IRC Daemon - * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de) + * Copyright (c)2001-2013 Alexander Barton (alex@barton.de) and Contributors. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * Please read the file COPYING, README and AUTHORS for more information. - * - * IRC command parser and validator */ - #include "portab.h" -static char UNUSED id[] = "$Id: parse.c,v 1.58 2003/01/13 18:56:30 alex Exp $"; +/** + * @file + * IRC command parser and validator. + */ #include "imp.h" #include #include #include #include +#include #include "ngircd.h" #include "defines.h" #include "conn-func.h" -#include "client.h" #include "channel.h" #include "log.h" #include "messages.h" @@ -36,94 +36,151 @@ static char UNUSED id[] = "$Id: parse.c,v 1.58 2003/01/13 18:56:30 alex Exp $"; #include "imp.h" #include "irc.h" +#include "irc-cap.h" #include "irc-channel.h" +#include "irc-encoding.h" #include "irc-info.h" #include "irc-login.h" +#include "irc-metadata.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" +#include "conf.h" + +struct _NUMERIC { + int numeric; + bool (*function) PARAMS(( CLIENT *Client, REQUEST *Request )); +}; -COMMAND My_Commands[] = +static 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 }, - { "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 }, - { "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 }, + { "ADMIN", IRC_ADMIN, CLIENT_USER|CLIENT_SERVER, 0, 1, 0, 0, 0 }, + { "AWAY", IRC_AWAY, CLIENT_USER, 0, 1, 0, 0, 0 }, + { "CAP", IRC_CAP, CLIENT_ANY, 1, 2, 0, 0, 0 }, + { "CONNECT", IRC_CONNECT, CLIENT_USER|CLIENT_SERVER, 0, -1, 0, 0, 0 }, +#ifdef STRICT_RFC + { "DIE", IRC_DIE, CLIENT_USER, 0, 0, 0, 0, 0 }, +#else + { "DIE", IRC_DIE, CLIENT_USER, 0, 1, 0, 0, 0 }, +#endif + { "DISCONNECT", IRC_DISCONNECT, CLIENT_USER, 1, 1, 0, 0, 0 }, + { "ERROR", IRC_ERROR, CLIENT_ANY, 0, -1, 0, 0, 0 }, + { "GLINE", IRC_xLINE, CLIENT_USER|CLIENT_SERVER, 0, -1, 0, 0, 0 }, + { "HELP", IRC_HELP, CLIENT_USER, 0, 1, 0, 0, 0 }, + { "INFO", IRC_INFO, CLIENT_USER|CLIENT_SERVER, 0, 1, 0, 0, 0 }, + { "INVITE", IRC_INVITE, CLIENT_USER|CLIENT_SERVER, 2, 2, 0, 0, 0 }, + { "ISON", IRC_ISON, CLIENT_USER, 1, -1, 0, 0, 0 }, + { "JOIN", IRC_JOIN, CLIENT_USER|CLIENT_SERVER, 1, 2, 0, 0, 0 }, + { "KICK", IRC_KICK, CLIENT_USER|CLIENT_SERVER, 2, 3, 0, 0, 0 }, + { "KILL", IRC_KILL, CLIENT_USER|CLIENT_SERVER, 2, 2, 0, 0, 0 }, + { "KLINE", IRC_xLINE, CLIENT_USER|CLIENT_SERVER, 0, -1, 0, 0, 0 }, + { "LINKS", IRC_LINKS, CLIENT_USER|CLIENT_SERVER, 0, 2, 0, 0, 0 }, + { "LIST", IRC_LIST, CLIENT_USER|CLIENT_SERVER, 0, 2, 0, 0, 0 }, + { "LUSERS", IRC_LUSERS, CLIENT_USER|CLIENT_SERVER, 0, 2, 0, 0, 0 }, + { "METADATA", IRC_METADATA, CLIENT_SERVER, 3, 3, 0, 0, 0 }, + { "MODE", IRC_MODE, CLIENT_USER|CLIENT_SERVER, 1, -1, 0, 0, 0 }, + { "MOTD", IRC_MOTD, CLIENT_USER|CLIENT_SERVER, 0, 1, 0, 0, 0 }, + { "NAMES", IRC_NAMES, CLIENT_USER|CLIENT_SERVER, 0, 2, 0, 0, 0 }, + { "NICK", IRC_NICK, CLIENT_ANY, 0, -1, 0, 0, 0 }, + { "NJOIN", IRC_NJOIN, CLIENT_SERVER, 2, 2, 0, 0, 0 }, + { "NOTICE", IRC_NOTICE, CLIENT_ANY, 0, -1, 0, 0, 0 }, + { "OPER", IRC_OPER, CLIENT_USER, 2, 2, 0, 0, 0 }, + { "PART", IRC_PART, CLIENT_USER|CLIENT_SERVER, 1, 2, 0, 0, 0 }, + { "PASS", IRC_PASS, CLIENT_ANY, 0, -1, 0, 0, 0 }, + { "PING", IRC_PING, CLIENT_USER|CLIENT_SERVER, 0, -1, 0, 0, 0 }, + { "PONG", IRC_PONG, CLIENT_ANY, 0, -1, 0, 0, 0 }, + { "PRIVMSG", IRC_PRIVMSG, CLIENT_USER|CLIENT_SERVER, 0, 2, 0, 0, 0 }, + { "QUIT", IRC_QUIT, CLIENT_ANY, 0, 1, 0, 0, 0 }, + { "REHASH", IRC_REHASH, CLIENT_USER, 0, 0, 0, 0, 0 }, + { "RESTART", IRC_RESTART, CLIENT_USER, 0, 0, 0, 0, 0 }, + { "SERVER", IRC_SERVER, CLIENT_ANY, 0, -1, 0, 0, 0 }, + { "SERVICE", IRC_SERVICE, CLIENT_ANY, 6, 6, 0, 0, 0 }, + { "SERVLIST", IRC_SERVLIST, CLIENT_USER, 0, 2, 0, 0, 0 }, + { "SQUERY", IRC_SQUERY, CLIENT_USER|CLIENT_SERVER, 0, 2, 0, 0, 0 }, + { "SQUIT", IRC_SQUIT, CLIENT_USER|CLIENT_SERVER, 2, 2, 0, 0, 0 }, + { "STATS", IRC_STATS, CLIENT_USER|CLIENT_SERVER, 0, 2, 0, 0, 0 }, + { "SVSNICK", IRC_SVSNICK, CLIENT_SERVER, 2, 2, 0, 0, 0 }, + { "SUMMON", IRC_SUMMON, CLIENT_USER|CLIENT_SERVER, 0, -1, 0, 0, 0 }, + { "TIME", IRC_TIME, CLIENT_USER|CLIENT_SERVER, 0, 1, 0, 0, 0 }, + { "TOPIC", IRC_TOPIC, CLIENT_USER|CLIENT_SERVER, 1, 2, 0, 0, 0 }, + { "TRACE", IRC_TRACE, CLIENT_USER|CLIENT_SERVER, 0, -1, 0, 0, 0 }, + { "USER", IRC_USER, CLIENT_ANY, 0, -1, 0, 0, 0 }, + { "USERHOST", IRC_USERHOST, CLIENT_USER, 1, -1, 0, 0, 0 }, + { "USERS", IRC_USERS, CLIENT_USER|CLIENT_SERVER, 0, -1, 0, 0, 0 }, + { "VERSION", IRC_VERSION, CLIENT_USER|CLIENT_SERVER, 0, 1, 0, 0, 0 }, + { "WALLOPS", IRC_WALLOPS, CLIENT_USER|CLIENT_SERVER, 1, 1, 0, 0, 0 }, + { "WEBIRC", IRC_WEBIRC, CLIENT_UNKNOWN, 4, 4, 0, 0, 0 }, + { "WHO", IRC_WHO, CLIENT_USER, 0, 2, 0, 0, 0 }, + { "WHOIS", IRC_WHOIS, CLIENT_USER|CLIENT_SERVER, 0, -1, 0, 0, 0 }, + { "WHOWAS", IRC_WHOWAS, CLIENT_USER|CLIENT_SERVER, 0, -1, 0, 0, 0 }, + #ifdef IRCPLUS - { "CHANINFO", IRC_CHANINFO, CLIENT_SERVER, 0, 0, 0 }, + { "CHANINFO", IRC_CHANINFO, CLIENT_SERVER, 0, -1, 0, 0, 0 }, +# ifdef ICONV + { "CHARCONV", IRC_CHARCONV, CLIENT_USER, 1, 1, 0, 0, 0 }, +# endif #endif - { NULL, NULL, 0x0, 0, 0, 0 } /* Ende-Marke */ -}; +#ifndef STRICT_RFC + { "GET", IRC_QUIT_HTTP, CLIENT_UNKNOWN, 0, -1, 0, 0, 0 }, + { "POST", IRC_QUIT_HTTP, CLIENT_UNKNOWN, 0, -1, 0, 0, 0 }, +#endif + { NULL, NULL, 0x0, 0, 0, 0, 0, 0 } /* End-Mark */ +}; -LOCAL VOID Init_Request PARAMS(( REQUEST *Req )); +static void Init_Request PARAMS(( REQUEST *Req )); -LOCAL BOOLEAN Validate_Prefix PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )); -LOCAL BOOLEAN Validate_Command PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )); -LOCAL BOOLEAN Validate_Args PARAMS(( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )); +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 )); -LOCAL BOOLEAN Handle_Request PARAMS(( CONN_ID Idx, REQUEST *Req )); +static bool Handle_Request PARAMS(( CONN_ID Idx, REQUEST *Req )); +static bool ScrubCTCP PARAMS((char *Request)); +/** + * 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 ) +Parse_GetCommandStruct( void ) { return My_Commands; } /* Parse_GetCommandStruct */ -GLOBAL BOOLEAN -Parse_Request( CONN_ID Idx, CHAR *Request ) +/** + * 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 assume 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 occurred and the connection has been shut down. + */ +GLOBAL bool +Parse_Request( CONN_ID Idx, char *Request ) { - /* Client-Request parsen. Bei einem schwerwiegenden Fehler wird - * die Verbindung geschlossen und FALSE geliefert. - * Der Aufbau gueltiger Requests ist in RFC 2812, 2.3 definiert. */ - REQUEST req; - CHAR *start, *ptr; - BOOLEAN closed; + char *start, *ptr; + bool closed; assert( Idx >= 0 ); assert( Request != NULL ); @@ -134,51 +191,47 @@ Parse_Request( CONN_ID Idx, CHAR *Request ) Init_Request( &req ); - /* Fuehrendes und folgendes "Geraffel" verwerfen */ + /* remove leading & trailing whitespace */ ngt_TrimStr( Request ); - /* gibt es ein Prefix? */ - if( Request[0] == ':' ) - { - /* Prefix vorhanden */ + if (Conf_ScrubCTCP && ScrubCTCP(Request)) + return true; + + if (Request[0] == ':') { + /* Prefix */ 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!?" ); + LogDebug("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 */ + /* ignore multiple spaces between prefix and command */ 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 */ + /* ignore multiple spaces between parameters */ while( *(ptr + 1) == ' ' ) ptr++; #endif } req.command = start; - /* Argumente, Parameter */ + /* Arguments, Parameters */ if( ptr ) { - /* Prinzipiell gibt es welche :-) */ start = ptr + 1; while( start ) { - /* Parameter-String "zerlegen" */ if( start[0] == ':' ) { req.argv[req.argc] = start + 1; @@ -192,8 +245,6 @@ Parse_Request( CONN_ID Idx, CHAR *Request ) { *ptr = '\0'; #ifndef STRICT_RFC - /* multiple Leerzeichen als - * Parametertrenner ignorieren */ while( *(ptr + 1) == ' ' ) ptr++; #endif } @@ -209,7 +260,6 @@ Parse_Request( CONN_ID Idx, CHAR *Request ) } } - /* 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; @@ -218,12 +268,14 @@ Parse_Request( CONN_ID Idx, CHAR *Request ) } /* Parse_Request */ -LOCAL VOID +/** + * Initialize request structure. + * @param Req Request structure to be initialized. + */ +static void Init_Request( REQUEST *Req ) { - /* Neue Request-Struktur initialisieren */ - - INT i; + int i; assert( Req != NULL ); @@ -234,182 +286,321 @@ Init_Request( REQUEST *Req ) } /* Init_Request */ -LOCAL BOOLEAN -Validate_Prefix( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ) +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; + *Closed = false; - /* Client-Struktur der Connection ermitteln */ - client = Client_GetFromConn( Idx ); + 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 )) + if (!Req->prefix && Client_Type(client) == CLIENT_SERVER + && !(Conn_Options(Idx) & CONN_RFC1459) + && strcasecmp(Req->command, "ERROR") != 0 + && strcasecmp(Req->command, "PING") != 0) { - /* noch nicht registrierte Verbindung. - * Das Prefix wird ignoriert. */ + Log(LOG_ERR, + "Received command without prefix (connection %d, command \"%s\")!?", + Idx, Req->command); + if (!Conn_WriteStr(Idx, "ERROR :Prefix missing")) + *Closed = true; + return false; + } + + if (!Req->prefix) + return true; + + /* only validate if this connection is already registered */ + if (Client_Type(client) != CLIENT_USER + && Client_Type(client) != CLIENT_SERVER + && Client_Type(client) != CLIENT_SERVICE) { + /* not registered, ignore prefix */ Req->prefix = NULL; - return TRUE; + return true; } - /* pruefen, ob der im Prefix angegebene Client bekannt ist */ + /* check if client in prefix is known */ 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; + if (!c) { + 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( Client_GetFromConn( Idx )), Idx, Req->command ); - Conn_Close( Idx, NULL, "Spoofed prefix", TRUE ); - *Closed = TRUE; - return FALSE; + /* check if the client named in the prefix is expected + * to come from that direction */ + if (Client_NextHop(c) != client) { + if (Client_Type(c) != CLIENT_SERVER) { + 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; + } else { + Log(LOG_INFO, + "Ignoring spoofed prefix \"%s\" from \"%s\" (connection %d, command \"%s\").", + Req->prefix, Client_Mask(Conn_GetClient(Idx)), Idx, + Req->command); + } + return false; + } - return TRUE; + return true; } /* Validate_Prefix */ -LOCAL BOOLEAN -Validate_Command( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ) +static bool +Validate_Command( UNUSED CONN_ID Idx, UNUSED REQUEST *Req, bool *Closed ) { assert( Idx >= 0 ); assert( Req != NULL ); - *Closed = FALSE; + *Closed = false; - return TRUE; -} /* Validate_Comman */ + return true; +} /* Validate_Command */ -LOCAL BOOLEAN -Validate_Args( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed ) +static bool +#ifdef STRICT_RFC +Validate_Args(CONN_ID Idx, REQUEST *Req, bool *Closed) +#else +Validate_Args(UNUSED CONN_ID Idx, UNUSED REQUEST *Req, bool *Closed) +#endif { +#ifdef STRICT_RFC + int i; +#endif + + *Closed = false; + +#ifdef STRICT_RFC assert( Idx >= 0 ); assert( Req != NULL ); - *Closed = FALSE; - return TRUE; + /* CR and LF are never allowed in command parameters. + * But since we do accept lines terminated only with CR or LF in + * "non-RFC-compliant mode" (besides the correct CR+LF combination), + * this check can only trigger in "strict RFC" mode; therefore we + * optimize it away otherwise ... */ + for (i = 0; i < Req->argc; i++) { + if (strchr(Req->argv[i], '\r') || strchr(Req->argv[i], '\n')) { + Log(LOG_ERR, + "Invalid character(s) in parameter (connection %d, command %s)!?", + Idx, Req->command); + if (!Conn_WriteStr(Idx, + "ERROR :Invalid character(s) in parameter!")) + *Closed = true; + return false; + } + } +#endif + + return true; } /* Validate_Args */ -LOCAL BOOLEAN -Handle_Request( CONN_ID Idx, REQUEST *Req ) +/* Command is a status code ("numeric") from another server */ +static bool +Handle_Numeric(CLIENT *client, REQUEST *Req) { - /* Client-Request verarbeiten. Bei einem schwerwiegenden Fehler - * wird die Verbindung geschlossen und FALSE geliefert. */ + static const struct _NUMERIC Numerics[] = { + { 5, IRC_Num_ISUPPORT }, + { 20, NULL }, + { 376, IRC_Num_ENDOFMOTD } + }; + int i, num; + char str[LINE_LEN]; + CLIENT *prefix, *target = NULL; + + /* Determine target */ + if (Req->argc > 0) { + if (strcmp(Req->argv[0], "*") != 0) + target = Client_Search(Req->argv[0]); + else + target = Client_ThisServer(); + } - CLIENT *client, *target, *prefix; - CHAR str[LINE_LEN]; - BOOLEAN result; + 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 */ + num = atoi(Req->command); + + for (i = 0; i < (int) C_ARRAY_SIZE(Numerics); i++) { + if (num == Numerics[i].numeric) { + if (!Numerics[i].function) + return CONNECTED; + return Numerics[i].function(client, Req); + } + } + + 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; + } + + 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); +} + +static bool +Handle_Request( CONN_ID Idx, REQUEST *Req ) +{ + CLIENT *client; + bool result = true; + int client_type; COMMAND *cmd; - INT i; assert( Idx >= 0 ); assert( Req != NULL ); assert( Req->command != NULL ); - client = Client_GetFromConn( Idx ); + client = Conn_GetClient( Idx ); assert( client != NULL ); - /* Statuscode? */ - if(( Client_Type( client ) == CLIENT_SERVER ) && ( strlen( Req->command ) == 3 ) && ( atoi( Req->command ) > 100 )) - { - /* Command is a status code from an other server */ + /* 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); - /* 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, ignore it */ - Log( LOG_DEBUG, "Ignored status code %s from \"%s\".", Req->command, Client_ID( client )); - return TRUE; + cmd = My_Commands; + while (cmd->name) { + if (strcasecmp(Req->command, cmd->name) != 0) { + cmd++; + continue; } - /* 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; + if (!(client_type & cmd->type)) { + if (client_type == CLIENT_USER + && cmd->type & CLIENT_SERVER) + return IRC_WriteErrClient(client, + ERR_NOTREGISTEREDSERVER_MSG, + Client_ID(client)); + else + return IRC_WriteErrClient(client, + ERR_NOTREGISTERED_MSG, + Client_ID(client)); } - /* 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 )); + if (Req->argc < cmd->min_argc || + (cmd->max_argc != -1 && Req->argc > cmd->max_argc)) { + IRC_SetPenalty(client, 2); + return IRC_WriteStrClient(client, ERR_NEEDMOREPARAMS_MSG, + Client_ID(client), Req->command); } - return IRC_WriteStrClientPrefix( target, prefix, "%s", str ); + + /* Command is allowed for this client: call it and count + * generated bytes in output */ + 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; } - cmd = My_Commands; - while( cmd->name ) - { - /* Befehl suchen */ - if( strcasecmp( Req->command, cmd->name ) != 0 ) - { - cmd++; continue; - } + if (client_type != CLIENT_USER && + client_type != CLIENT_SERVER && + client_type != CLIENT_SERVICE ) + return true; - 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( ); + /* 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" ); - /* Adjust counters */ - if( Client_Type( client ) != CLIENT_SERVER ) cmd->lcount++; - else cmd->rcount++; + if (Client_Type(client) != CLIENT_SERVER) + result = IRC_WriteErrClient(client, ERR_UNKNOWNCOMMAND_MSG, + Client_ID(client), Req->command); - return result; - } - else - { - /* Befehl ist fuer diesen Client-Typ nicht erlaubt! */ - return IRC_WriteStrClient( client, ERR_NOTREGISTERED_MSG, Client_ID( client )); - } - } - - /* Unbekannter Befehl */ - 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 ) return IRC_WriteStrClient( client, ERR_UNKNOWNCOMMAND_MSG, Client_ID( client ), Req->command ); - else return TRUE; + 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- */