/*
* ngIRCd -- The Next Generation IRC Daemon
- * Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
+ * Copyright (c)2001-2008 Alexander Barton (alex@barton.de)
*
* 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
* Please read the file COPYING, README and AUTHORS for more information.
*/
-
#include "portab.h"
-static char UNUSED id[] = "$Id: parse.c,v 1.67 2006/04/23 10:37:27 fw Exp $";
-
/**
* @file
* IRC command parser and validator.
#include "irc-oper.h"
#include "irc-server.h"
#include "irc-write.h"
+#include "numeric.h"
#include "exp.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 },
{ "DISCONNECT", IRC_DISCONNECT, CLIENT_USER, 0, 0, 0 },
{ "ERROR", IRC_ERROR, 0xFFFF, 0, 0, 0 },
{ "HELP", IRC_HELP, CLIENT_USER, 0, 0, 0 },
+ { "INFO", IRC_INFO, CLIENT_USER|CLIENT_SERVER, 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 },
{ "REHASH", IRC_REHASH, CLIENT_USER, 0, 0, 0 },
{ "RESTART", IRC_RESTART, CLIENT_USER, 0, 0, 0 },
{ "SERVER", IRC_SERVER, 0xFFFF, 0, 0, 0 },
+ { "SERVICE", IRC_SERVICE, 0xFFFF, 0, 0, 0 },
+ { "SERVLIST", IRC_SERVLIST, CLIENT_USER, 0, 0, 0 },
+ { "SQUERY", IRC_SQUERY, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
{ "SQUIT", IRC_SQUIT, CLIENT_SERVER, 0, 0, 0 },
{ "STATS", IRC_STATS, CLIENT_USER|CLIENT_SERVER, 0, 0, 0 },
+ { "SUMMON", IRC_SUMMON, 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 },
+ { "USERS", IRC_USERS, CLIENT_USER|CLIENT_SERVER, 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 },
{ NULL, NULL, 0x0, 0, 0, 0 } /* Ende-Marke */
};
-
static void Init_Request PARAMS(( REQUEST *Req ));
static bool Validate_Prefix PARAMS(( CONN_ID Idx, REQUEST *Req, bool *Closed ));
static bool Handle_Request PARAMS(( CONN_ID Idx, REQUEST *Req ));
+#define ARRAY_SIZE(x) (sizeof(x)/sizeof((x)[0]))
/**
* Return the pointer to the global "IRC command structure".
Init_Request( &req );
- /* Fuehrendes und folgendes "Geraffel" verwerfen */
+ /* remove leading & trailing whitespace */
ngt_TrimStr( Request );
- /* gibt es ein Prefix? */
if( Request[0] == ':' )
{
- /* Prefix vorhanden */
+ /* Prefix */
req.prefix = Request + 1;
ptr = strchr( Request, ' ' );
if( ! ptr )
{
- Log( LOG_DEBUG, "Connection %d: Parse error: prefix without command!?", Idx );
+ 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;
{
*ptr = '\0';
#ifndef STRICT_RFC
- /* multiple Leerzeichen als
- * Parametertrenner ignorieren */
while( *(ptr + 1) == ' ' ) ptr++;
#endif
}
}
}
- /* 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;
*Closed = false;
- /* ist ueberhaupt ein Prefix vorhanden? */
if( ! Req->prefix ) return true;
- /* Client-Struktur der Connection ermitteln */
client = Conn_GetClient( Idx );
assert( client != NULL );
- /* nur validieren, wenn bereits registrierte Verbindung */
+ /* only validate if this connection is already registered */
if(( Client_Type( client ) != CLIENT_USER ) && ( Client_Type( client ) != CLIENT_SERVER ) && ( Client_Type( client ) != CLIENT_SERVICE ))
{
- /* noch nicht registrierte Verbindung.
- * Das Prefix wird ignoriert. */
+ /* not registered, ignore prefix */
Req->prefix = NULL;
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;
}
- /* pruefen, ob der Client mit dem angegebenen Prefix in Richtung
- * des Senders liegt, d.h. sicherstellen, dass das Prefix nicht
- * gefaelscht ist */
+ /* check if the client named in the prefix is expected
+ * to come from that direction */
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;
static bool
-Validate_Args( UNUSED CONN_ID Idx, UNUSED REQUEST *Req, bool *Closed )
+#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;
+
+ /* 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 */
+/* Command is a status code ("numeric") from another server */
static bool
-Handle_Request( CONN_ID Idx, REQUEST *Req )
+Handle_Numeric(CLIENT *client, REQUEST *Req)
{
- /* Client-Request verarbeiten. Bei einem schwerwiegenden Fehler
- * wird die Verbindung geschlossen und false geliefert. */
-
- CLIENT *client, *target, *prefix;
+ static const struct _NUMERIC Numerics[] = {
+ { 5, IRC_Num_ISUPPORT },
+ { 20, NULL },
+ { 376, IRC_Num_ENDOFMOTD }
+ };
+ int i, num;
char str[LINE_LEN];
- bool result;
+ 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();
+ }
+
+ 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) 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 );
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 */
-
- /* 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;
- }
-
- /* 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 );
- }
+ /* 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 )
- {
- /* Befehl suchen */
- if( strcasecmp( Req->command, cmd->name ) != 0 )
- {
- cmd++; continue;
+ while (cmd->name) {
+ 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( );
+ if (!(client_type & cmd->type))
+ return IRC_WriteStrClient(client, ERR_NOTREGISTERED_MSG, Client_ID(client));
- /* Adjust counters */
- if( Client_Type( client ) != CLIENT_SERVER ) cmd->lcount++;
- else cmd->rcount++;
+ /* Command is allowed for this client: call it and count produced bytes */
+ Conn_ResetWCounter();
+ result = (cmd->function)(client, Req);
+ cmd->bytes += Conn_WCounter();
- return result;
- }
+ /* Adjust counters */
+ if (client_type != CLIENT_SERVER)
+ cmd->lcount++;
else
- {
- /* Befehl ist fuer diesen Client-Typ nicht erlaubt! */
- return IRC_WriteStrClient( client, ERR_NOTREGISTERED_MSG, Client_ID( client ));
- }
+ cmd->rcount++;
+ return result;
}
- if( Client_Type( client ) != CLIENT_USER &&
- Client_Type( client ) != CLIENT_SERVER &&
- Client_Type( client ) != CLIENT_SERVICE )
+ if (client_type != CLIENT_USER &&
+ client_type != CLIENT_SERVER &&
+ client_type != CLIENT_SERVICE )
return true;
-
+
/* Unknown command and registered connection: generate error: */
- Log( LOG_DEBUG, "Connection %d: Unknown command \"%s\", %d %s,%s prefix.",
+ 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" );
result = IRC_WriteStrClient(client, ERR_UNKNOWNCOMMAND_MSG,
Client_ID(client), Req->command);
Conn_SetPenalty(Idx, 1);
- return result;
}
-
- return true;
+ return result;
} /* Handle_Request */