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Code Issues Releases Wiki Activity

- Semantik der Validate_XXX()-Funktionen verbessert,

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- Validate_Prefix() mit "Leben" erfuellt ;-)
This commit is contained in:
Alexander Barton 2002-07-26 21:12:24 +00:00
parent 3b6c3d6d64
commit e0ed3aa141
1 changed files with 59 additions and 33 deletions
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92
src/ngircd/parse.c
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@ -9,7 +9,7 @@
* Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
* der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
*
* $Id: parse.c,v 1.33 2002/05/27 13:09:27 alex Exp $
* $Id: parse.c,v 1.34 2002/07/26 21:12:24 alex Exp $
*
* parse.c: Parsen der Client-Anfragen
*/
@ -50,11 +50,9 @@
LOCAL VOID Init_Request PARAMS(( REQUEST *Req ));
LOCAL BOOLEAN Parse_Error PARAMS(( CONN_ID Idx, CHAR *Error ));
LOCAL BOOLEAN Validate_Prefix PARAMS(( REQUEST *Req ));
LOCAL BOOLEAN Validate_Command PARAMS(( REQUEST *Req ));
LOCAL BOOLEAN Validate_Args 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 ));
LOCAL BOOLEAN Handle_Request PARAMS(( CONN_ID Idx, REQUEST *Req ));
@ -68,6 +66,7 @@ Parse_Request( CONN_ID Idx, CHAR *Request )
REQUEST req;
CHAR *start, *ptr;
BOOLEAN closed;
assert( Idx >= 0 );
assert( Request != NULL );
@ -75,7 +74,7 @@ Parse_Request( CONN_ID Idx, CHAR *Request )
#ifdef SNIFFER
if( NGIRCd_Sniffer ) Log( LOG_DEBUG, " <- connection %d: '%s'.", Idx, Request );
#endif
Init_Request( &req );
/* Fuehrendes und folgendes "Geraffel" verwerfen */
@ -87,7 +86,11 @@ Parse_Request( CONN_ID Idx, CHAR *Request )
/* Prefix vorhanden */
req.prefix = Request + 1;
ptr = strchr( Request, ' ' );
if( ! ptr ) return Parse_Error( Idx, "Prefix without command!?" );
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
@ -98,7 +101,7 @@ Parse_Request( CONN_ID Idx, CHAR *Request )
}
else start = Request;
if( ! Validate_Prefix( &req )) return Parse_Error( Idx, "Invalid prefix");
if( ! Validate_Prefix( Idx, &req, &closed )) return ! closed;
/* Befehl */
ptr = strchr( start, ' ' );
@ -113,7 +116,7 @@ Parse_Request( CONN_ID Idx, CHAR *Request )
}
req.command = start;
if( ! Validate_Command( &req )) return Parse_Error( Idx, "Invalid command" );
if( ! Validate_Command( Idx, &req, &closed )) return ! closed;
/* Argumente, Parameter */
if( ptr )
@ -142,18 +145,18 @@ Parse_Request( CONN_ID Idx, CHAR *Request )
#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)" );
if( ! Validate_Args( Idx, &req, &closed )) return ! closed;
return Handle_Request( Idx, &req );
} /* Parse_Request */
@ -165,7 +168,7 @@ Init_Request( REQUEST *Req )
/* Neue Request-Struktur initialisieren */
INT i;
assert( Req != NULL );
Req->prefix = NULL;
@ -176,40 +179,63 @@ Init_Request( REQUEST *Req )
LOCAL BOOLEAN
Parse_Error( CONN_ID Idx, CHAR *Error )
Validate_Prefix( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
{
/* Fehler beim Parsen. Fehlermeldung an den Client schicken.
* TRUE: Connection wurde durch diese Funktion nicht geschlossen,
* FALSE: Connection wurde terminiert. */
CLIENT *c;
assert( Idx >= 0 );
assert( Error != NULL );
Log( LOG_DEBUG, "Connection %d: Parse error: %s", Idx, Error );
return Conn_WriteStr( Idx, "ERROR :Parse error: %s", Error );
} /* Parse_Error */
LOCAL BOOLEAN
Validate_Prefix( REQUEST *Req )
{
assert( Req != NULL );
*Closed = FALSE;
/* ist ueberhaupt ein Prefix vorhanden? */
if( ! Req->prefix ) 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, client not known (connection %d)!?", Idx );
if( ! Conn_WriteStr( Idx, "ERROR :Invalid prefix, client not known!?" )) *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_GetFromConn( Idx ))
{
/* das angegebene Prefix ist aus dieser Richtung, also
* aus der gegebenen Connection, ungueltig! */
Log( LOG_ERR, "Spoofed prefix \"%s\" from \"%s\" (connection %d)!", Req->prefix, Client_Mask( Client_GetFromConn( Idx )), Idx );
Conn_Close( Idx, NULL, "Spoofed prefix", TRUE );
*Closed = TRUE;
return FALSE;
}
return TRUE;
} /* Validate_Prefix */
LOCAL BOOLEAN
Validate_Command( REQUEST *Req )
Validate_Command( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
{
assert( Idx >= 0 );
assert( Req != NULL );
*Closed = FALSE;
return TRUE;
} /* Validate_Comman */
LOCAL BOOLEAN
Validate_Args( REQUEST *Req )
Validate_Args( CONN_ID Idx, REQUEST *Req, BOOLEAN *Closed )
{
assert( Idx >= 0 );
assert( Req != NULL );
*Closed = FALSE;
return TRUE;
} /* Validate_Args */
@ -309,7 +335,7 @@ Handle_Request( CONN_ID Idx, REQUEST *Req )
else if( strcasecmp( Req->command, "INVITE" ) == 0 ) return IRC_INVITE( client, Req );
else if( strcasecmp( Req->command, "KICK" ) == 0 ) return IRC_KICK( client, Req );
else if( strcasecmp( Req->command, "BAN" ) == 0 ) return IRC_BAN( client, Req );
/* Unbekannter Befehl */
if( Client_Type( client ) != CLIENT_SERVER ) IRC_WriteStrClient( client, ERR_UNKNOWNCOMMAND_MSG, Client_ID( client ), Req->command );
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" );