#include "portab.h"
-static char UNUSED id[] = "$Id: conn.c,v 1.117 2003/02/23 12:04:05 alex Exp $";
+static char UNUSED id[] = "$Id: conn.c,v 1.123 2003/04/25 16:47:52 alex Exp $";
#include "imp.h"
#include <assert.h>
#endif
#ifdef HAVE_STDINT_H
-#include <stdint.h> /* u.a. fuer Mac OS X */
+#include <stdint.h> /* e.g. for Mac OS X */
+#endif
+
+#ifdef USE_TCPWRAP
+#include <tcpd.h> /* for TCP Wrappers */
#endif
#include "defines.h"
LOCAL BOOLEAN Init_Socket PARAMS(( INT Sock ));
LOCAL VOID New_Server PARAMS(( INT Server, CONN_ID Idx ));
LOCAL VOID Read_Resolver_Result PARAMS(( INT r_fd ));
+LOCAL VOID Simple_Message PARAMS(( INT Sock, CHAR *Msg ));
LOCAL fd_set My_Listeners;
LOCAL fd_set My_Sockets;
LOCAL fd_set My_Connects;
+#ifdef USE_TCPWRAP
+INT allow_severity = LOG_INFO;
+INT deny_severity = LOG_ERR;
+#endif
+
GLOBAL VOID
Conn_Init( VOID )
#ifdef RENDEZVOUS
Rendezvous_UnregisterListeners( );
#endif
-
+
/* Sockets schliessen */
for( i = 0; i < Conn_MaxFD + 1; i++ )
{
}
}
}
-
+
free( My_Connections );
My_Connections = NULL;
Pool_Size = 0;
#ifdef RENDEZVOUS
Rendezvous_UnregisterListeners( );
#endif
-
+
Log( LOG_INFO, "Shutting down all listening sockets ..." );
for( i = 0; i < Conn_MaxFD + 1; i++ )
{
#ifdef RENDEZVOUS
CHAR name[CLIENT_ID_LEN], *info;
#endif
-
+
/* Server-"Listen"-Socket initialisieren */
memset( &addr, 0, sizeof( addr ));
addr.sin_family = AF_INET;
tv.tv_usec = 0;
if( timeout ) tv.tv_sec = TIME_RES;
else tv.tv_sec = 0;
-
+
/* Auf Aktivitaet warten */
i = select( Conn_MaxFD + 1, &read_sockets, &write_sockets, NULL, &tv );
if( i == 0 )
if( errno != EINTR )
{
Log( LOG_EMERG, "Conn_Handler(): select(): %s!", strerror( errno ));
- Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
+ Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
exit( 1 );
}
continue;
/* Es kann geschrieben werden ... */
idx = Socket2Index( i );
if( idx == NONE ) continue;
-
+
if( ! Handle_Write( idx ))
{
/* Fehler beim Schreiben! Diesen Socket nun
{
/* Oops, we can't close the socket!? This is fatal! */
Log( LOG_EMERG, "Error closing connection %d (socket %d) with %s:%d - %s!", Idx, My_Connections[Idx].sock, My_Connections[Idx].host, ntohs( My_Connections[Idx].addr.sin_port), strerror( errno ));
- Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE );
+ Log( LOG_ALERT, "%s exiting due to fatal errors!", PACKAGE_NAME );
exit( 1 );
}
} /* Conn_Close */
+GLOBAL VOID
+Conn_SyncServerStruct( VOID )
+{
+ /* Synchronize server structures (connection IDs):
+ * connections <-> configuration */
+
+ CLIENT *client;
+ CONN_ID i;
+ INT c;
+
+ for( i = 0; i < Pool_Size; i++ )
+ {
+ /* Established connection? */
+ if( My_Connections[i].sock <= NONE ) continue;
+
+ /* Server connection? */
+ client = Client_GetFromConn( i );
+ if(( ! client ) || ( Client_Type( client ) != CLIENT_SERVER )) continue;
+
+ for( c = 0; c < MAX_SERVERS; c++ )
+ {
+ /* Configured server? */
+ if( ! Conf_Server[c].host[0] ) continue;
+
+ /* Duplicate? */
+ if( strcmp( Conf_Server[c].name, Client_ID( client )) == 0 ) Conf_Server[c].conn_id = i;
+ }
+ }
+} /* SyncServerStruct */
+
+
LOCAL BOOLEAN
Try_Write( CONN_ID Idx )
{
/* Daten aus Schreibpuffer versenden bzw. Connection aufbauen */
INT len, res, err;
+ socklen_t sock_len;
CLIENT *c;
assert( Idx > NONE );
FD_CLR( My_Connections[Idx].sock, &My_Connects );
/* Ergebnis des connect() ermitteln */
- len = sizeof( err );
- res = getsockopt( My_Connections[Idx].sock, SOL_SOCKET, SO_ERROR, &err, &len );
- assert( len == sizeof( err ));
+ sock_len = sizeof( err );
+ res = getsockopt( My_Connections[Idx].sock, SOL_SOCKET, SO_ERROR, &err, &sock_len );
+ assert( sock_len == sizeof( err ));
/* Fehler aufgetreten? */
if(( res != 0 ) || ( err != 0 ))
/* Neue Client-Verbindung von Listen-Socket annehmen und
* CLIENT-Struktur anlegen. */
+#ifdef USE_TCPWRAP
+ struct request_info req;
+#endif
struct sockaddr_in new_addr;
INT new_sock, new_sock_len;
RES_STAT *s;
return;
}
+#ifdef USE_TCPWRAP
+ /* Validate socket using TCP Wrappers */
+ request_init( &req, RQ_DAEMON, PACKAGE_NAME, RQ_FILE, new_sock, RQ_CLIENT_SIN, &new_addr, NULL );
+ if( ! hosts_access( &req ))
+ {
+ /* Access denied! */
+ Log( deny_severity, "Refused connection from %s (by TCP Wrappers)!", inet_ntoa( new_addr.sin_addr ));
+ Simple_Message( new_sock, "ERROR :Connection refused" );
+ close( new_sock );
+ return;
+ }
+#endif
+
/* Socket initialisieren */
Init_Socket( new_sock );
if( idx >= Pool_Size )
{
new_size = Pool_Size + CONNECTION_POOL;
-
+
/* Im bisherigen Pool wurde keine freie Connection-Struktur mehr gefunden.
* Wenn erlaubt und moeglich muss nun der Pool vergroessert werden: */
-
+
if( Conf_MaxConnections > 0 )
{
/* Es ist ein Limit konfiguriert */
{
/* Mehr Verbindungen duerfen wir leider nicht mehr annehmen ... */
Log( LOG_ALERT, "Can't accept connection: limit (%d) reached!", Pool_Size );
+ Simple_Message( new_sock, "ERROR :Connection limit reached" );
close( new_sock );
return;
}
if( new_size < Pool_Size )
{
Log( LOG_ALERT, "Can't accespt connection: limit (%d) reached -- overflow!", Pool_Size );
+ Simple_Message( new_sock, "ERROR :Connection limit reached" );
close( new_sock );
return;
}
-
+
/* zunaechst realloc() versuchen; wenn das scheitert, malloc() versuchen
* und Daten ggf. "haendisch" umkopieren. (Haesslich! Eine wirklich
* dynamische Verwaltung waere wohl _deutlich_ besser ...) */
{
/* Offenbar steht kein weiterer Sepeicher zur Verfuegung :-( */
Log( LOG_EMERG, "Can't allocate memory! [New_Connection]" );
+ Simple_Message( new_sock, "ERROR: Internal error" );
close( new_sock );
return;
}
-
+
/* Struktur umkopieren ... */
memcpy( ptr, My_Connections, sizeof( CONNECTION ) * Pool_Size );
-
+
Log( LOG_DEBUG, "Allocated new connection pool for %ld items (%ld bytes). [malloc()/memcpy()]", new_size, sizeof( CONNECTION ) * new_size );
}
else Log( LOG_DEBUG, "Allocated new connection pool for %ld items (%ld bytes). [realloc()]", new_size, sizeof( CONNECTION ) * new_size );
-
+
/* Adjust pointer to new block */
My_Connections = ptr;
-
+
/* Initialize new items */
for( idx = Pool_Size; idx < new_size; idx++ ) Init_Conn_Struct( idx );
idx = Pool_Size;
-
+
/* Adjust new pool size */
Pool_Size = new_size;
}
if( ! c )
{
Log( LOG_ALERT, "Can't accept connection: can't create client structure!" );
+ Simple_Message( new_sock, "ERROR :Internal error" );
close( new_sock );
return;
}
/* Sub-Prozess wurde asyncron gestartet */
My_Connections[idx].res_stat = s;
}
-
+
/* Penalty-Zeit setzen */
Conn_SetPenalty( idx, 4 );
} /* New_Connection */
if( ! Unzip_Buffer( Idx )) return FALSE;
}
#endif
-
+
if( My_Connections[Idx].rdatalen < 1 ) break;
/* Eine komplette Anfrage muss mit CR+LF enden, vgl.
* RFC 2812. Haben wir eine? */
My_Connections[Idx].rbuf[My_Connections[Idx].rdatalen] = '\0';
ptr = strstr( My_Connections[Idx].rbuf, "\r\n" );
-
+
if( ptr ) delta = 2;
#ifndef STRICT_RFC
else
else if( ptr2 ) ptr = ptr2;
}
#endif
-
+
action = FALSE;
if( ptr )
{
}
#endif
}
-
+
if( action ) result = TRUE;
} while( action );
-
+
return result;
} /* Handle_Buffer */
LOCAL VOID
New_Server( INT Server, CONN_ID Idx )
{
- /* Neue Server-Verbindung aufbauen */
+ /* Establish new server link */
struct sockaddr_in new_addr;
struct in_addr inaddr;
assert( Server > NONE );
assert( Idx > NONE );
- /* Wurde eine gueltige IP-Adresse gefunden? */
+ /* Did we get a valid IP address? */
if( ! Conf_Server[Server].ip[0] )
{
- /* Nein. Verbindung wieder freigeben: */
+ /* No. Free connection structure and abort: */
Init_Conn_Struct( Idx );
+ Conf_Server[Server].conn_id = NONE;
Log( LOG_ERR, "Can't connect to \"%s\" (connection %d): ip address unknown!", Conf_Server[Server].host, Idx );
return;
}
if( inaddr.s_addr == (unsigned)-1 )
#endif
{
- /* Konnte Adresse nicht konvertieren */
+ /* Can't convert IP address */
Init_Conn_Struct( Idx );
+ Conf_Server[Server].conn_id = NONE;
Log( LOG_ERR, "Can't connect to \"%s\" (connection %d): can't convert ip address %s!", Conf_Server[Server].host, Idx, Conf_Server[Server].ip );
return;
}
new_sock = socket( PF_INET, SOCK_STREAM, 0 );
if ( new_sock < 0 )
{
+ /* Can't create socket */
Init_Conn_Struct( Idx );
+ Conf_Server[Server].conn_id = NONE;
Log( LOG_CRIT, "Can't create socket: %s!", strerror( errno ));
return;
}
res = connect( new_sock, (struct sockaddr *)&new_addr, sizeof( new_addr ));
if(( res != 0 ) && ( errno != EINPROGRESS ))
{
+ /* Can't connect socket */
Log( LOG_CRIT, "Can't connect socket: %s!", strerror( errno ));
close( new_sock );
Init_Conn_Struct( Idx );
+ Conf_Server[Server].conn_id = NONE;
return;
}
c = Client_NewLocal( Idx, inet_ntoa( new_addr.sin_addr ), CLIENT_UNKNOWNSERVER, FALSE );
if( ! c )
{
+ /* Can't create new client structure */
close( new_sock );
Init_Conn_Struct( Idx );
+ Conf_Server[Server].conn_id = NONE;
Log( LOG_ALERT, "Can't establish connection: can't create client structure!" );
return;
}
Client_SetIntroducer( c, c );
Client_SetToken( c, TOKEN_OUTBOUND );
- /* Verbindung registrieren */
+ /* Register connection */
My_Connections[Idx].sock = new_sock;
My_Connections[Idx].addr = new_addr;
strlcpy( My_Connections[Idx].host, Conf_Server[Server].host, sizeof( My_Connections[Idx].host ));
- /* Neuen Socket registrieren */
+ /* Register new socket */
FD_SET( new_sock, &My_Sockets );
FD_SET( new_sock, &My_Connects );
if( new_sock > Conn_MaxFD ) Conn_MaxFD = new_sock;
-
+
Log( LOG_DEBUG, "Registered new connection %d on socket %d.", Idx, My_Connections[Idx].sock );
} /* New_Server */
}
Log( LOG_DEBUG, "Resolver: %s is \"%s\".", My_Connections[i].host, result );
-
+
/* Aufraeumen */
close( My_Connections[i].res_stat->pipe[0] );
close( My_Connections[i].res_stat->pipe[1] );
} /* Read_Resolver_Result */
+LOCAL VOID
+Simple_Message( INT Sock, CHAR *Msg )
+{
+ /* Write "simple" message to socket, without using compression
+ * or even the connection write buffers. Used e.g. for error
+ * messages by New_Connection(). */
+
+ assert( Sock > NONE );
+ assert( Msg != NULL );
+
+ (VOID)send( Sock, Msg, strlen( Msg ), 0 );
+ (VOID)send( Sock, "\r\n", 2, 0 );
+} /* Simple_Error */
+
+
/* -eof- */