/*
* ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001 by Alexander Barton (alex@barton.de)
+ * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
*
- * Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
- * der GNU General Public License (GPL), wie von der Free Software Foundation
- * herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
- * der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
- * Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
- * der an comBase beteiligten Autoren finden Sie in der Datei AUTHORS.
- *
- * $Id: parse.c,v 1.8 2001/12/29 03:08:19 alex Exp $
- *
- * parse.c: Parsen der Client-Anfragen
- *
- * $Log: parse.c,v $
- * Revision 1.8 2001/12/29 03:08:19 alex
- * - Fuehrende und folgende Leerzeichen etc. in Requests werden geloescht.
- * - Logmeldungen (mal wieder) ein wenig angepasst.
- *
- * Revision 1.7 2001/12/27 19:13:21 alex
- * - neue Befehle NOTICE und PRIVMSG.
- * - Debug-Logging ein wenig reduziert.
- *
- * Revision 1.6 2001/12/26 14:45:37 alex
- * - "Code Cleanups".
- *
- * Revision 1.5 2001/12/26 03:23:03 alex
- * - PING/PONG-Befehle implementiert.
- *
- * Revision 1.4 2001/12/25 22:04:26 alex
- * - Aenderungen an den Debug- und Logging-Funktionen.
- *
- * Revision 1.3 2001/12/25 19:18:36 alex
- * - Gross- und Kleinschreibung der IRC-Befehle wird ignoriert.
- * - bessere Debug-Ausgaben.
- *
- * Revision 1.2 2001/12/23 21:56:47 alex
- * - bessere Debug-Ausgaben,
- * - Bug im Parameter-Parser behoben (bei "langem" Parameter)
- * - erste IRC-Befehle werden erkannt :-)
- *
- * Revision 1.1 2001/12/21 23:53:16 alex
- * - Modul zum Parsen von Client-Requests begonnen.
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * Please read the file COPYING, README and AUTHORS for more information.
*/
-#include <portab.h>
-#include "global.h"
+#include "portab.h"
+
+static char UNUSED id[] = "$Id: parse.c,v 1.69 2007/11/21 12:16:36 alex Exp $";
+
+/**
+ * @file
+ * IRC command parser and validator.
+ */
-#include <imp.h>
+#include "imp.h"
#include <assert.h>
+#include <stdlib.h>
#include <stdio.h>
#include <string.h>
+#include <strings.h>
+#include "ngircd.h"
+#include "defines.h"
+#include "conn-func.h"
#include "client.h"
-#include "conn.h"
-#include "irc.h"
+#include "channel.h"
#include "log.h"
#include "messages.h"
#include "tool.h"
-#include <exp.h>
+#include "exp.h"
#include "parse.h"
+#include "imp.h"
+#include "irc.h"
+#include "irc-channel.h"
+#include "irc-info.h"
+#include "irc-login.h"
+#include "irc-mode.h"
+#include "irc-op.h"
+#include "irc-oper.h"
+#include "irc-server.h"
+#include "irc-write.h"
+#include "numeric.h"
-LOCAL VOID Init_Request( REQUEST *Req );
+#include "exp.h"
-LOCAL BOOLEAN Parse_Error( CONN_ID Idx, CHAR *Error );
-LOCAL BOOLEAN Validate_Prefix( REQUEST *Req );
-LOCAL BOOLEAN Validate_Command( REQUEST *Req );
-LOCAL BOOLEAN Validate_Args( REQUEST *Req );
+COMMAND My_Commands[] =
+{
+ { "ADMIN", IRC_ADMIN, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "AWAY", IRC_AWAY, CLIENT_USER, 0, 0, 0 },
+ { "CONNECT", IRC_CONNECT, CLIENT_USER, 0, 0, 0 },
+ { "DIE", IRC_DIE, CLIENT_USER, 0, 0, 0 },
+ { "DISCONNECT", IRC_DISCONNECT, CLIENT_USER, 0, 0, 0 },
+ { "ERROR", IRC_ERROR, 0xFFFF, 0, 0, 0 },
+ { "HELP", IRC_HELP, CLIENT_USER, 0, 0, 0 },
+ { "INVITE", IRC_INVITE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "ISON", IRC_ISON, CLIENT_USER, 0, 0, 0 },
+ { "JOIN", IRC_JOIN, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "KICK", IRC_KICK, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "KILL", IRC_KILL, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "LINKS", IRC_LINKS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "LIST", IRC_LIST, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "LUSERS", IRC_LUSERS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "MODE", IRC_MODE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "MOTD", IRC_MOTD, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "NAMES", IRC_NAMES, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "NICK", IRC_NICK, 0xFFFF, 0, 0, 0 },
+ { "NJOIN", IRC_NJOIN, CLIENT_SERVER, 0, 0, 0 },
+ { "NOTICE", IRC_NOTICE, 0xFFFF, 0, 0, 0 },
+ { "OPER", IRC_OPER, CLIENT_USER, 0, 0, 0 },
+ { "PART", IRC_PART, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "PASS", IRC_PASS, 0xFFFF, 0, 0, 0 },
+ { "PING", IRC_PING, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "PONG", IRC_PONG, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "PRIVMSG", IRC_PRIVMSG, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "QUIT", IRC_QUIT, 0xFFFF, 0, 0, 0 },
+ { "REHASH", IRC_REHASH, CLIENT_USER, 0, 0, 0 },
+ { "RESTART", IRC_RESTART, CLIENT_USER, 0, 0, 0 },
+ { "SERVER", IRC_SERVER, 0xFFFF, 0, 0, 0 },
+ { "SQUIT", IRC_SQUIT, CLIENT_SERVER, 0, 0, 0 },
+ { "STATS", IRC_STATS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "TIME", IRC_TIME, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "TOPIC", IRC_TOPIC, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "TRACE", IRC_TRACE, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "USER", IRC_USER, 0xFFFF, 0, 0, 0 },
+ { "USERHOST", IRC_USERHOST, CLIENT_USER, 0, 0, 0 },
+ { "VERSION", IRC_VERSION, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "WALLOPS", IRC_WALLOPS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "WHO", IRC_WHO, CLIENT_USER, 0, 0, 0 },
+ { "WHOIS", IRC_WHOIS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "WHOWAS", IRC_WHOWAS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+#ifdef IRCPLUS
+ { "CHANINFO", IRC_CHANINFO, CLIENT_SERVER, 0, 0, 0 },
+#endif
+ { NULL, NULL, 0x0, 0, 0, 0 } /* Ende-Marke */
+};
-LOCAL BOOLEAN Handle_Request( CONN_ID Idx, REQUEST *Req );
+NUMERIC My_Numerics[] =
+{
+ { 005, IRC_Num_ISUPPORT },
+ { 376, IRC_Num_ENDOFMOTD },
+ { 0, NULL } /* end marker */
+};
-GLOBAL VOID Parse_Init( VOID )
-{
-} /* Parse_Init */
+static void Init_Request PARAMS(( REQUEST *Req ));
+static bool Validate_Prefix PARAMS(( CONN_ID Idx, REQUEST *Req, bool *Closed ));
+static bool Validate_Command PARAMS(( CONN_ID Idx, REQUEST *Req, bool *Closed ));
+static bool Validate_Args PARAMS(( CONN_ID Idx, REQUEST *Req, bool *Closed ));
-GLOBAL VOID Parse_Exit( VOID )
-{
-} /* Parse_Exit */
+static bool Handle_Request PARAMS(( CONN_ID Idx, REQUEST *Req ));
-GLOBAL BOOLEAN Parse_Request( CONN_ID Idx, 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 )
{
- /* 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. */
+ return My_Commands;
+} /* Parse_GetCommandStruct */
+
+/**
+ * Parse a command ("request") received from a client.
+ *
+ * This function is called after the connection layer received a valid CR+LF
+ * terminated line of text: we asume that this is a valid IRC command and
+ * try to do something useful with it :-)
+ *
+ * All errors are reported to the client from which the command has been
+ * received, and if the error is fatal this connection is closed down.
+ *
+ * This function is able to parse the syntax as described in RFC 2812,
+ * section 2.3.
+ *
+ * @param Idx Index of the connection from which the command has been received.
+ * @param Request NULL terminated line of text (the "command").
+ * @return true on success (valid command or "regular" error), false if a
+ * fatal error occured and the connection has been shut down.
+ */
+GLOBAL bool
+Parse_Request( CONN_ID Idx, char *Request )
+{
REQUEST req;
- CHAR *start, *ptr;
+ char *start, *ptr;
+ bool closed;
assert( Idx >= 0 );
assert( Request != NULL );
#ifdef SNIFFER
- Log( LOG_DEBUG, " <- connection %d: '%s'.", Idx, Request );
+ if( NGIRCd_Sniffer ) Log( LOG_DEBUG, " <- connection %d: '%s'.", Idx, Request );
#endif
-
+
Init_Request( &req );
/* Fuehrendes und folgendes "Geraffel" verwerfen */
/* Prefix vorhanden */
req.prefix = Request + 1;
ptr = strchr( Request, ' ' );
- if( ! ptr ) return Parse_Error( Idx, "Invalid prefix (command missing!?)" );
+ if( ! ptr )
+ {
+ Log( LOG_DEBUG, "Connection %d: Parse error: prefix without command!?", Idx );
+ return Conn_WriteStr( Idx, "ERROR :Prefix without command!?" );
+ }
*ptr = '\0';
+#ifndef STRICT_RFC
+ /* multiple Leerzeichen als Trenner zwischen
+ * Prefix und Befehl ignorieren */
+ while( *(ptr + 1) == ' ' ) ptr++;
+#endif
start = ptr + 1;
}
else start = Request;
- if( ! Validate_Prefix( &req )) return Parse_Error( Idx, "Invalid prefix");
-
/* Befehl */
ptr = strchr( start, ' ' );
- if( ptr ) *ptr = '\0';
+ if( ptr )
+ {
+ *ptr = '\0';
+#ifndef STRICT_RFC
+ /* multiple Leerzeichen als Trenner vor
+ * Parametern ignorieren */
+ while( *(ptr + 1) == ' ' ) ptr++;
+#endif
+ }
req.command = start;
- if( ! Validate_Command( &req )) return Parse_Error( Idx, "Invalid command" );
-
/* Argumente, Parameter */
if( ptr )
{
{
req.argv[req.argc] = start;
ptr = strchr( start, ' ' );
- if( ptr ) *ptr = '\0';
+ if( ptr )
+ {
+ *ptr = '\0';
+#ifndef STRICT_RFC
+ /* multiple Leerzeichen als
+ * Parametertrenner ignorieren */
+ while( *(ptr + 1) == ' ' ) ptr++;
+#endif
+ }
}
-
+
req.argc++;
if( start[0] == ':' ) break;
if( req.argc > 14 ) break;
-
+
if( ptr ) start = ptr + 1;
else start = NULL;
}
}
-
- if( ! Validate_Args( &req )) return Parse_Error( Idx, "Invalid argument(s)" );
-
+
+ /* Daten validieren */
+ if( ! Validate_Prefix( Idx, &req, &closed )) return ! closed;
+ if( ! Validate_Command( Idx, &req, &closed )) return ! closed;
+ if( ! Validate_Args( Idx, &req, &closed )) return ! closed;
+
return Handle_Request( Idx, &req );
} /* Parse_Request */
-LOCAL VOID Init_Request( REQUEST *Req )
+/**
+ * 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 );
Req->prefix = NULL;
} /* Init_Request */
-LOCAL BOOLEAN Parse_Error( CONN_ID Idx, CHAR *Error )
+static bool
+Validate_Prefix( CONN_ID Idx, REQUEST *Req, bool *Closed )
{
- /* Fehler beim Parsen. Fehlermeldung an den Client schicken.
- * TRUE: Connection wurde durch diese Funktion nicht geschlossen,
- * FALSE: Connection wurde terminiert. */
-
- CHAR msg[256];
-
+ CLIENT *client, *c;
+
assert( Idx >= 0 );
- assert( Error != NULL );
+ assert( Req != NULL );
- sprintf( msg, "Parse error: %s!", Error );
- return Conn_WriteStr( Idx, msg );
-} /* Parse_Error */
+ *Closed = false;
+ /* ist ueberhaupt ein Prefix vorhanden? */
+ if( ! Req->prefix ) return true;
-LOCAL BOOLEAN Validate_Prefix( REQUEST *Req )
-{
- assert( Req != NULL );
- return TRUE;
+ /* Client-Struktur der Connection ermitteln */
+ client = Conn_GetClient( Idx );
+ assert( client != NULL );
+
+ /* nur validieren, wenn bereits registrierte Verbindung */
+ if(( Client_Type( client ) != CLIENT_USER ) && ( Client_Type( client ) != CLIENT_SERVER ) && ( Client_Type( client ) != CLIENT_SERVICE ))
+ {
+ /* noch nicht registrierte Verbindung.
+ * Das Prefix wird ignoriert. */
+ Req->prefix = NULL;
+ return true;
+ }
+
+ /* pruefen, ob der im Prefix angegebene Client bekannt ist */
+ c = Client_Search( Req->prefix );
+ if( ! c )
+ {
+ /* im Prefix angegebener Client ist nicht bekannt */
+ Log( LOG_ERR, "Invalid prefix \"%s\", client not known (connection %d, command %s)!?", Req->prefix, Idx, Req->command );
+ if( ! Conn_WriteStr( Idx, "ERROR :Invalid prefix \"%s\", client not known!?", Req->prefix )) *Closed = true;
+ return false;
+ }
+
+ /* pruefen, ob der Client mit dem angegebenen Prefix in Richtung
+ * des Senders liegt, d.h. sicherstellen, dass das Prefix nicht
+ * gefaelscht ist */
+ if( Client_NextHop( c ) != client )
+ {
+ /* das angegebene Prefix ist aus dieser Richtung, also
+ * aus der gegebenen Connection, ungueltig! */
+ Log( LOG_ERR, "Spoofed prefix \"%s\" from \"%s\" (connection %d, command %s)!", Req->prefix, Client_Mask( Conn_GetClient( Idx )), Idx, Req->command );
+ Conn_Close( Idx, NULL, "Spoofed prefix", true);
+ *Closed = true;
+ return false;
+ }
+
+ return true;
} /* Validate_Prefix */
-LOCAL BOOLEAN Validate_Command( REQUEST *Req )
+static bool
+Validate_Command( UNUSED CONN_ID Idx, UNUSED REQUEST *Req, bool *Closed )
{
+ assert( Idx >= 0 );
assert( Req != NULL );
- return TRUE;
+ *Closed = false;
+
+ return true;
} /* Validate_Comman */
-LOCAL BOOLEAN Validate_Args( REQUEST *Req )
+static bool
+Validate_Args( UNUSED CONN_ID Idx, UNUSED REQUEST *Req, bool *Closed )
{
+ assert( Idx >= 0 );
assert( Req != NULL );
- return TRUE;
+ *Closed = false;
+
+ return true;
} /* Validate_Args */
-LOCAL BOOLEAN Handle_Request( CONN_ID Idx, REQUEST *Req )
+static bool
+Handle_Request( CONN_ID Idx, REQUEST *Req )
{
/* Client-Request verarbeiten. Bei einem schwerwiegenden Fehler
- * wird die Verbindung geschlossen und FALSE geliefert. */
+ * wird die Verbindung geschlossen und false geliefert. */
- CLIENT *client;
+ CLIENT *client, *target, *prefix;
+ char str[LINE_LEN];
+ bool result;
+ COMMAND *cmd;
+ NUMERIC *num;
+ int i;
assert( Idx >= 0 );
assert( Req != NULL );
assert( Req->command != NULL );
- client = Client_GetFromConn( Idx );
+ client = Conn_GetClient( Idx );
assert( client != NULL );
- if( strcasecmp( Req->command, "PASS" ) == 0 ) return IRC_PASS( client, Req );
- else if( strcasecmp( Req->command, "NICK" ) == 0 ) return IRC_NICK( client, Req );
- else if( strcasecmp( Req->command, "USER" ) == 0 ) return IRC_USER( client, Req );
- else if( strcasecmp( Req->command, "QUIT" ) == 0 ) return IRC_QUIT( client, Req );
- else if( strcasecmp( Req->command, "PING" ) == 0 ) return IRC_PING( client, Req );
- else if( strcasecmp( Req->command, "PONG" ) == 0 ) return IRC_PONG( client, Req );
- else if( strcasecmp( Req->command, "MOTD" ) == 0 ) return IRC_MOTD( client, Req );
- else if( strcasecmp( Req->command, "PRIVMSG" ) == 0 ) return IRC_PRIVMSG( client, Req );
- else if( strcasecmp( Req->command, "NOTICE" ) == 0 ) return IRC_NOTICE( client, Req );
- else if( strcasecmp( Req->command, "MODE" ) == 0 ) return IRC_MODE( client, Req );
+ /* Numeric? */
+ if ((Client_Type(client) == CLIENT_SERVER ||
+ Client_Type(client) == CLIENT_UNKNOWNSERVER)
+ && strlen(Req->command) == 3 && atoi(Req->command) > 1) {
+ /* Command is a status code ("numeric") from an other server */
+
+ /* Determine target */
+ if (Req->argc > 0)
+ target = Client_Search( Req->argv[0] );
+ else
+ target = NULL;
+ if (!target) {
+ /* Status code without target!? */
+ if (Req->argc > 0)
+ Log(LOG_WARNING,
+ "Unknown target for status code %s: \"%s\"",
+ Req->command, Req->argv[0]);
+ else
+ Log(LOG_WARNING,
+ "Unknown target for status code %s!",
+ Req->command);
+ return true;
+ }
+ if (target == Client_ThisServer()) {
+ /* This server is the target of the numeric */
+ i = atoi(Req->command);
+
+ num = My_Numerics;
+ while (num->numeric > 0) {
+ if (i != num->numeric) {
+ num++;
+ continue;
+ }
+ result = (num->function)(client, Req);
+ return result;
+ }
+
+ LogDebug("Ignored status code %s from \"%s\".",
+ Req->command, Client_ID(client));
+ return true;
+ }
+
+ /* Determine source */
+ if( ! Req->prefix[0] )
+ {
+ /* Oops, no prefix!? */
+ Log( LOG_WARNING, "Got status code %s from \"%s\" without prefix!?", Req->command, Client_ID( client ));
+ return true;
+ }
+ else prefix = Client_Search( Req->prefix );
+ if( ! prefix )
+ {
+ /* Oops, unknown prefix!? */
+ Log( LOG_WARNING, "Got status code %s from unknown source: \"%s\"", Req->command, Req->prefix );
+ return true;
+ }
+
+ /* Forward status code */
+ strlcpy( str, Req->command, sizeof( str ));
+ for( i = 0; i < Req->argc; i++ )
+ {
+ if( i < Req->argc - 1 ) strlcat( str, " ", sizeof( str ));
+ else strlcat( str, " :", sizeof( str ));
+ strlcat( str, Req->argv[i], sizeof( str ));
+ }
+ return IRC_WriteStrClientPrefix( target, prefix, "%s", str );
+ }
+
+ cmd = My_Commands;
+ while( cmd->name )
+ {
+ /* Befehl suchen */
+ if( strcasecmp( Req->command, cmd->name ) != 0 )
+ {
+ cmd++; continue;
+ }
+
+ if( Client_Type( client ) & cmd->type )
+ {
+ /* Command is allowed for this client: call it and count produced bytes */
+ Conn_ResetWCounter( );
+ result = (cmd->function)( client, Req );
+ cmd->bytes += Conn_WCounter( );
+
+ /* Adjust counters */
+ if( Client_Type( client ) != CLIENT_SERVER ) cmd->lcount++;
+ else cmd->rcount++;
+
+ return result;
+ }
+ else
+ {
+ /* Befehl ist fuer diesen Client-Typ nicht erlaubt! */
+ return IRC_WriteStrClient( client, ERR_NOTREGISTERED_MSG, Client_ID( client ));
+ }
+ }
+
+ if( Client_Type( client ) != CLIENT_USER &&
+ Client_Type( client ) != CLIENT_SERVER &&
+ Client_Type( client ) != CLIENT_SERVICE )
+ return true;
- /* Unbekannter Befehl */
- IRC_WriteStrClient( client, This_Server, ERR_UNKNOWNCOMMAND_MSG, Client_Name( client ), Req->command );
- Log( LOG_DEBUG, "User \"%s!%s@%s\": Unknown command \"%s\", %d %s,%s prefix.", client->nick, client->user, client->host, Req->command, Req->argc, Req->argc == 1 ? "parameter" : "parameters", Req->prefix ? "" : " no" );
+ /* Unknown command and registered connection: generate error: */
+ Log( LOG_DEBUG, "Connection %d: Unknown command \"%s\", %d %s,%s prefix.",
+ Client_Conn( client ), Req->command, Req->argc,
+ Req->argc == 1 ? "parameter" : "parameters",
+ Req->prefix ? "" : " no" );
+
+ if (Client_Type(client) != CLIENT_SERVER) {
+ result = IRC_WriteStrClient(client, ERR_UNKNOWNCOMMAND_MSG,
+ Client_ID(client), Req->command);
+ Conn_SetPenalty(Idx, 1);
+ return result;
+ }
- return TRUE;
+ return true;
} /* Handle_Request */
projects / ngircd-alex.git / blobdiff