* Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
* der an comBase beteiligten Autoren finden Sie in der Datei AUTHORS.
*
- * $Id: conn.c,v 1.17 2001/12/29 03:06:16 alex Exp $
+ * $Id: conn.c,v 1.18 2001/12/29 20:17:25 alex Exp $
*
* connect.h: Verwaltung aller Netz-Verbindungen ("connections")
*
* $Log: conn.c,v $
+ * Revision 1.18 2001/12/29 20:17:25 alex
+ * - asyncronen Resolver (IP->Name) implementiert, dadurch div. Aenderungen.
+ *
* Revision 1.17 2001/12/29 03:06:16 alex
* - Loglevel (nochmal) angepasst.
*
#include <time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
+#include <netdb.h>
#ifdef HAVE_STDINT_H
#include <stdint.h> /* u.a. fuer Mac OS X */
#define READBUFFER_LEN 2 * MAX_CMDLEN /* Laenge des Lesepuffers je Verbindung (Bytes) */
#define WRITEBUFFER_LEN 4096 /* Laenge des Schreibpuffers je Verbindung (Bytes) */
+#define HOST_LEN 256 /* max. Laenge eines Hostnamen */
+
+
+typedef struct _Res_Stat
+{
+ INT pid; /* PID des Child-Prozess */
+ INT out_pipe[2]; /* Pipe fuer IPC: zum Client */
+ INT in_pipe[2]; /* Pipe fuer IPC: vom Client */
+} RES_STAT;
+
typedef struct _Connection
{
INT sock; /* Socket Handle */
struct sockaddr_in addr; /* Adresse des Client */
+ RES_STAT *res_stat; /* "Resolver-Status", s.o. */
+ CHAR host[HOST_LEN]; /* Hostname */
CHAR rbuf[READBUFFER_LEN + 1]; /* Lesepuffer */
INT rdatalen; /* Laenge der Daten im Lesepuffer */
CHAR wbuf[WRITEBUFFER_LEN + 1]; /* Schreibpuffer */
LOCAL BOOLEAN Try_Write( CONN_ID Idx );
LOCAL VOID Handle_Buffer( CONN_ID Idx );
LOCAL VOID Check_Connections( VOID );
+LOCAL VOID Init_Conn_Struct( INT Idx );
+
+LOCAL RES_STAT *Resolve( CHAR *Host );
+LOCAL VOID Do_Resolve( INT r_fd, INT w_fd );
+LOCAL VOID Read_Resolver_Result( INT r_fd );
-LOCAL fd_set My_Listener;
+LOCAL fd_set My_Listeners;
LOCAL fd_set My_Sockets;
+LOCAL fd_set My_Resolvers;
LOCAL INT My_Max_Fd;
CONN_ID i;
/* zu Beginn haben wir keine Verbindungen */
- FD_ZERO( &My_Listener );
+ FD_ZERO( &My_Listeners );
FD_ZERO( &My_Sockets );
+ FD_ZERO( &My_Resolvers );
My_Max_Fd = 0;
/* Connection-Struktur initialisieren */
- for( i = 0; i < MAX_CONNECTIONS; i++ ) My_Connections[i].sock = NONE;
+ for( i = 0; i < MAX_CONNECTIONS; i++ ) Init_Conn_Struct( i );
} /* Conn_Init */
if( My_Connections[idx].sock == i ) break;
}
if( idx < MAX_CONNECTIONS ) Conn_Close( idx, "Server going down ..." );
- else if( FD_ISSET( i, &My_Listener ))
+ else if( FD_ISSET( i, &My_Listeners ))
{
close( i );
Log( LOG_INFO, "Listening socket %d closed.", i );
}
/* Neuen Listener in Strukturen einfuegen */
- FD_SET( sock, &My_Listener );
+ FD_SET( sock, &My_Listeners );
FD_SET( sock, &My_Sockets );
if( sock > My_Max_Fd ) My_Max_Fd = sock;
FD_SET( My_Connections[i].sock, &write_sockets );
}
}
-
+
+ /* von welchen Sockets koennte gelesen werden? */
read_sockets = My_Sockets;
+ for( i = 0; i < MAX_CONNECTIONS; i++ )
+ {
+ if(( My_Connections[i].sock >= 0 ) && ( My_Connections[i].host[0] == '\0' ))
+ {
+ /* Hier muss noch auf den Resolver Sub-Prozess gewartet werden */
+ FD_CLR( My_Connections[i].sock, &read_sockets );
+ }
+ }
+ for( i = 0; i < My_Max_Fd + 1; i++ )
+ {
+ /* Pipes von Resolver Sub-Prozessen aufnehmen */
+ if( FD_ISSET( i, &My_Resolvers ))
+ {
+ FD_SET( i, &read_sockets );
+ }
+ }
+
+ /* Auf Aktivitaet warten */
if( select( My_Max_Fd + 1, &read_sockets, &write_sockets, NULL, &tv ) == -1 )
{
if( errno != EINTR ) Log( LOG_ALERT, "select(): %s!", strerror( errno ));
Client_Destroy( Client_GetFromConn( Idx ));
+ if( My_Connections[Idx].res_stat )
+ {
+ /* Resolver-Strukturen freigeben, wenn noch nicht geschehen */
+ FD_CLR( My_Connections[Idx].res_stat->in_pipe[0], &My_Resolvers );
+ close( My_Connections[Idx].res_stat->out_pipe[0] );
+ close( My_Connections[Idx].res_stat->out_pipe[1] );
+ close( My_Connections[Idx].res_stat->in_pipe[0] );
+ close( My_Connections[Idx].res_stat->in_pipe[1] );
+ free( My_Connections[Idx].res_stat );
+ }
+
FD_CLR( My_Connections[Idx].sock, &My_Sockets );
My_Connections[Idx].sock = NONE;
} /* Conn_Close */
CONN_ID idx;
assert( Sock >= 0 );
-
- if( FD_ISSET( Sock, &My_Listener ))
+
+ if( FD_ISSET( Sock, &My_Listeners ))
{
/* es ist einer unserer Listener-Sockets: es soll
* also eine neue Verbindung aufgebaut werden. */
New_Connection( Sock );
}
+ else if( FD_ISSET( Sock, &My_Resolvers ))
+ {
+ /* Rueckmeldung von einem Resolver Sub-Prozess */
+
+ Read_Resolver_Result( Sock );
+ }
else
{
/* Ein Client Socket: entweder ein User oder Server */
struct sockaddr_in new_addr;
INT new_sock, new_sock_len;
+ RES_STAT *s;
CONN_ID idx;
assert( Sock >= 0 );
}
/* Verbindung registrieren */
+ Init_Conn_Struct( idx );
My_Connections[idx].sock = new_sock;
My_Connections[idx].addr = new_addr;
- My_Connections[idx].rdatalen = 0;
- My_Connections[idx].wdatalen = 0;
- My_Connections[idx].lastdata = time( NULL );
- My_Connections[idx].lastping = 0;
/* Neuen Socket registrieren */
FD_SET( new_sock, &My_Sockets );
-
if( new_sock > My_Max_Fd ) My_Max_Fd = new_sock;
Log( LOG_NOTICE, "Accepted connection %d from %s:%d on socket %d.", idx, inet_ntoa( new_addr.sin_addr ), ntohs( new_addr.sin_port), Sock );
+
+ /* Hostnamen ermitteln */
+ s = Resolve( inet_ntoa( new_addr.sin_addr ));
+ if( s )
+ {
+ /* Sub-Prozess wurde asyncron gestartet */
+ My_Connections[idx].res_stat = s;
+ }
+ else
+ {
+ /* kann Namen nicht aufloesen */
+ strcpy( My_Connections[idx].host, inet_ntoa( new_addr.sin_addr ));
+ }
} /* New_Connection */
} /* Conn_Check */
+LOCAL VOID Init_Conn_Struct( INT Idx )
+{
+ /* Connection-Struktur initialisieren */
+
+ My_Connections[Idx].sock = NONE;
+ My_Connections[Idx].res_stat = NULL;
+ My_Connections[Idx].host[0] = '\0';
+ My_Connections[Idx].rbuf[0] = '\0';
+ My_Connections[Idx].rdatalen = 0;
+ My_Connections[Idx].wbuf[0] = '\0';
+ My_Connections[Idx].wdatalen = 0;
+ My_Connections[Idx].lastdata = time( NULL );
+ My_Connections[Idx].lastping = 0;
+} /* Init_Conn_Struct */
+
+
+LOCAL RES_STAT *Resolve( CHAR *Host )
+{
+ /* Hostnamen (asyncron!) aufloesen. Bei Fehler, z.B. wenn der
+ * Child-Prozess nicht erzeugt werden kann, wird NULL geliefert.
+ * Der Host kann dann nicht aufgeloest werden. */
+
+ RES_STAT *s;
+ INT pid;
+
+ s = malloc( sizeof( RES_STAT ));
+ if( ! s )
+ {
+ Log( LOG_ALERT, "Resolver: Can't alloc memory!" );
+ return NULL;
+ }
+
+ if( pipe( s->out_pipe ) != 0 )
+ {
+ free( s );
+ Log( LOG_ALERT, "Resolver: Can't create output pipe: %s!", strerror( errno ));
+ return NULL;
+ }
+
+ if( pipe( s->in_pipe ) != 0 )
+ {
+ free( s );
+ Log( LOG_ALERT, "Resolver: Can't create input pipe: %s!", strerror( errno ));
+ return NULL;
+ }
+
+ pid = fork( );
+ if( pid > 0 )
+ {
+ /* Haupt-Prozess */
+ if( write( s->out_pipe[1], Host, strlen( Host ) + 1 ) != ( strlen( Host ) + 1 ))
+ {
+ free( s );
+ Log( LOG_ALERT, "Resolver: Can't write to child: %s!", strerror( errno ));
+ return NULL;
+ }
+
+ FD_SET( s->in_pipe[0], &My_Resolvers );
+ if( s->in_pipe[0] > My_Max_Fd ) My_Max_Fd = s->in_pipe[0];
+
+ s->pid = pid;
+
+ Log( LOG_DEBUG, "Resolver process for \"%s\" (PID %d) created.", Host, pid );
+ return s;
+ }
+ else if( pid == 0 )
+ {
+ /* Sub-Prozess */
+ Log_Init_Resolver( );
+ Do_Resolve( s->out_pipe[0], s->in_pipe[1] );
+ Log_Exit_Resolver( );
+ exit( 0 );
+ }
+ else
+ {
+ /* Fehler */
+ free( s );
+ Log( LOG_ALERT, "Resolver: Can't fork: %s!", strerror( errno ));
+ return NULL;
+ }
+} /* Resolve */
+
+
+LOCAL VOID Read_Resolver_Result( INT r_fd )
+{
+ /* Ergebnis von Resolver Sub-Prozess aus Pipe lesen
+ * und entsprechende Connection aktualisieren */
+
+ CHAR hostname[HOST_LEN];
+ CLIENT *c;
+ INT i;
+
+ FD_CLR( r_fd, &My_Resolvers );
+
+ /* Anfrage vom Parent lesen */
+ if( read( r_fd, hostname, HOST_LEN) < 0 )
+ {
+ /* Fehler beim Lesen aus der Pipe */
+ close( r_fd );
+ Log( LOG_ALERT, "Resolver: Can't read result: %s!", strerror( errno ));
+ return;
+ }
+
+ for( i = 0; i < MAX_CONNECTIONS; i++ )
+ {
+ /* zugehoerige Connection suchen */
+ if(( My_Connections[i].sock >= 0 ) && ( My_Connections[i].res_stat ) && ( My_Connections[i].res_stat->in_pipe[0] == r_fd )) break;
+ }
+
+ if( i >= MAX_CONNECTIONS )
+ {
+ /* Opsa! Keine passende Connection gefunden!? */
+ close( r_fd );
+ Log( LOG_ALERT, "Resolver: Got result for unknown connection!?" );
+ return;
+ }
+
+ /* Aufraeumen */
+ close( My_Connections[i].res_stat->out_pipe[0] );
+ close( My_Connections[i].res_stat->out_pipe[1] );
+ close( My_Connections[i].res_stat->in_pipe[0] );
+ close( My_Connections[i].res_stat->in_pipe[1] );
+ free( My_Connections[i].res_stat );
+ My_Connections[i].res_stat = NULL;
+
+ /* Hostnamen setzen */
+ strcpy( My_Connections[i].host, hostname );
+ c = Client_GetFromConn( i );
+ if( c )
+ {
+ Log( LOG_DEBUG, "Set hostname: \"%s\".", hostname );
+ Client_SetHostname( c, hostname );
+ }
+} /* Read_Resolver_Result */
+
+
+LOCAL VOID Do_Resolve( INT r_fd, INT w_fd )
+{
+ /* Resolver Sub-Prozess: aufzuloesenden Namen aus
+ * der Pipe lesen, Ergebnis in Pipe schreiben. */
+
+ CHAR host[HOST_LEN], res_host[HOST_LEN];
+ struct hostent *h;
+
+ /* Anfrage vom Parent lesen */
+ if( read( r_fd, host, HOST_LEN) < 0 )
+ {
+ Log_Resolver( LOG_ALERT, "Resolver: Can't read from parent: %s!", strerror( errno ));
+ close( r_fd ); close( w_fd );
+ return;
+ }
+ host[HOST_LEN] = '\0';
+
+ Log_Resolver( LOG_DEBUG, "Now resolving \"%s\" ...", host );
+
+ /* Namen aufloesen */
+ h = gethostbyname( host );
+ if( h ) strcpy( res_host, h->h_name );
+ else
+ {
+ Log_Resolver( LOG_WARNING, "Can't resolce host name (code %d)!", h_errno );
+ strcpy( res_host, host );
+ }
+
+ /* Antwort an Parent schreiben */
+ if( write( w_fd, res_host, strlen( res_host ) + 1 ) != ( strlen( res_host ) + 1 ))
+ {
+ Log_Resolver( LOG_ALERT, "Resolver: Can't write to parent: %s!", strerror( errno ));
+ close( r_fd ); close( w_fd );
+ return;
+ }
+
+ Log_Resolver( LOG_DEBUG, "Ok, translated \"%s\" to \"%s\".", host, res_host );
+} /* Do_Resolve */
+
+
/* -eof- */
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