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https://github.com/osmarks/ngircd.git
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- neues Modul "resolve" begonnen.
This commit is contained in:
Alexander Barton
parent
9dc44d9bab
commit
46ec0f24f6
266
src/ngircd/resolve.c
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266
src/ngircd/resolve.c
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/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
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*
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* Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
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* der GNU General Public License (GPL), wie von der Free Software Foundation
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* herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
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* der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
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* Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
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* der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
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*
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* $Id: resolve.c,v 1.1 2002/05/27 11:23:27 alex Exp $
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*
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* resolve.c: asyncroner Resolver
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*/
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#include "portab.h"
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#include "imp.h"
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#include <assert.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include "conn.h"
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#include "defines.h"
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#include "log.h"
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#include "exp.h"
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#include "resolve.h"
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LOCAL VOID Do_ResolveAddr PARAMS(( struct sockaddr_in *Addr, INT w_fd ));
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LOCAL VOID Do_ResolveName PARAMS(( CHAR *Host, INT w_fd ));
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#ifdef h_errno
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LOCAL CHAR *Resolve_Error PARAMS(( INT H_Error ));
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#endif
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GLOBAL VOID
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Resolve_Init( VOID )
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{
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/* Modul initialisieren */
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FD_ZERO( &Resolver_FDs );
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} /* Resolve_Init */
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GLOBAL RES_STAT *
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Resolve_Addr( struct sockaddr_in *Addr )
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{
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/* IP (asyncron!) aufloesen. Bei Fehler, z.B. wenn der
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* Child-Prozess nicht erzeugt werden kann, wird NULL geliefert.
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* Der Host kann dann nicht aufgeloest werden. */
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RES_STAT *s;
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INT pid;
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/* Speicher anfordern */
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s = malloc( sizeof( RES_STAT ));
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if( ! s )
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{
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Log( LOG_EMERG, "Resolver: Can't allocate memory!" );
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return NULL;
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}
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/* Pipe fuer Antwort initialisieren */
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if( pipe( s->pipe ) != 0 )
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{
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free( s );
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Log( LOG_ALERT, "Resolver: Can't create output pipe: %s!", strerror( errno ));
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return NULL;
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}
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/* Sub-Prozess erzeugen */
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pid = fork( );
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if( pid > 0 )
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{
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/* Haupt-Prozess */
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Log( LOG_DEBUG, "Resolver for %s created (PID %d).", inet_ntoa( Addr->sin_addr ), pid );
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FD_SET( s->pipe[0], &Resolver_FDs );
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if( s->pipe[0] > Conn_MaxFD ) Conn_MaxFD = s->pipe[0];
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s->pid = pid;
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return s;
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}
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else if( pid == 0 )
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{
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/* Sub-Prozess */
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Log_Init_Resolver( );
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Do_ResolveAddr( Addr, s->pipe[1] );
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Log_Exit_Resolver( );
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exit( 0 );
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}
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else
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{
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/* Fehler */
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free( s );
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Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
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return NULL;
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}
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} /* Resolve_Addr */
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GLOBAL RES_STAT *
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Resolve_Name( CHAR *Host )
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{
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/* Hostnamen (asyncron!) aufloesen. Bei Fehler, z.B. wenn der
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* Child-Prozess nicht erzeugt werden kann, wird NULL geliefert.
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* Der Host kann dann nicht aufgeloest werden. */
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RES_STAT *s;
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INT pid;
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/* Speicher anfordern */
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s = malloc( sizeof( RES_STAT ));
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if( ! s )
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{
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Log( LOG_EMERG, "Resolver: Can't allocate memory!" );
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return NULL;
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}
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/* Pipe fuer Antwort initialisieren */
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if( pipe( s->pipe ) != 0 )
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{
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free( s );
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Log( LOG_ALERT, "Resolver: Can't create output pipe: %s!", strerror( errno ));
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return NULL;
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}
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/* Sub-Prozess erzeugen */
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pid = fork( );
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if( pid > 0 )
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{
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/* Haupt-Prozess */
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Log( LOG_DEBUG, "Resolver for \"%s\" created (PID %d).", Host, pid );
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FD_SET( s->pipe[0], &Resolver_FDs );
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if( s->pipe[0] > Conn_MaxFD ) Conn_MaxFD = s->pipe[0];
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s->pid = pid;
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return s;
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}
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else if( pid == 0 )
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{
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/* Sub-Prozess */
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Log_Init_Resolver( );
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Do_ResolveName( Host, s->pipe[1] );
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Log_Exit_Resolver( );
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exit( 0 );
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}
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else
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{
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/* Fehler */
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free( s );
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Log( LOG_CRIT, "Resolver: Can't fork: %s!", strerror( errno ));
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return NULL;
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}
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} /* Resolve_Name */
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LOCAL VOID
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Do_ResolveAddr( struct sockaddr_in *Addr, INT w_fd )
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{
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/* Resolver Sub-Prozess: IP aufloesen und Ergebnis in Pipe schreiben. */
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CHAR hostname[HOST_LEN];
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struct hostent *h;
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Log_Resolver( LOG_DEBUG, "Now resolving %s ...", inet_ntoa( Addr->sin_addr ));
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/* Namen aufloesen */
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h = gethostbyaddr( (CHAR *)&Addr->sin_addr, sizeof( Addr->sin_addr ), AF_INET );
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if( h ) strcpy( hostname, h->h_name );
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else
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{
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#ifdef h_errno
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Log_Resolver( LOG_WARNING, "Can't resolve address \"%s\": %s!", inet_ntoa( Addr->sin_addr ), Get_Error( h_errno ));
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#else
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Log_Resolver( LOG_WARNING, "Can't resolve address \"%s\"!", inet_ntoa( Addr->sin_addr ));
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#endif
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strcpy( hostname, inet_ntoa( Addr->sin_addr ));
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}
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/* Antwort an Parent schreiben */
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if( write( w_fd, hostname, strlen( hostname ) + 1 ) != ( strlen( hostname ) + 1 ))
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{
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Log_Resolver( LOG_CRIT, "Resolver: Can't write to parent: %s!", strerror( errno ));
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close( w_fd );
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return;
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}
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Log_Resolver( LOG_DEBUG, "Ok, translated %s to \"%s\".", inet_ntoa( Addr->sin_addr ), hostname );
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} /* Do_ResolveAddr */
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LOCAL VOID
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Do_ResolveName( CHAR *Host, INT w_fd )
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{
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/* Resolver Sub-Prozess: Name aufloesen und Ergebnis in Pipe schreiben. */
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CHAR ip[16];
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struct hostent *h;
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struct in_addr *addr;
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Log_Resolver( LOG_DEBUG, "Now resolving \"%s\" ...", Host );
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/* Namen aufloesen */
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h = gethostbyname( Host );
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if( h )
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{
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addr = (struct in_addr *)h->h_addr;
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strcpy( ip, inet_ntoa( *addr ));
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}
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else
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{
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#ifdef h_errno
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Log_Resolver( LOG_WARNING, "Can't resolve \"%s\": %s!", Host, Get_Error( h_errno ));
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#else
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Log_Resolver( LOG_WARNING, "Can't resolve \"%s\"!", Host );
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#endif
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strcpy( ip, "" );
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}
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/* Antwort an Parent schreiben */
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if( write( w_fd, ip, strlen( ip ) + 1 ) != ( strlen( ip ) + 1 ))
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{
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Log_Resolver( LOG_CRIT, "Resolver: Can't write to parent: %s!", strerror( errno ));
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close( w_fd );
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return;
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}
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if( ip[0] ) Log_Resolver( LOG_DEBUG, "Ok, translated \"%s\" to %s.", Host, ip );
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} /* Do_ResolveName */
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#ifdef h_errno
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LOCAL CHAR *
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Get_Error( INT H_Error )
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{
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/* Fehlerbeschreibung fuer H_Error liefern */
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switch( H_Error )
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{
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case HOST_NOT_FOUND:
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return "host not found";
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case NO_DATA:
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return "name valid but no IP address defined";
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case NO_RECOVERY:
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return "name server error";
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case TRY_AGAIN:
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return "name server temporary not available";
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default:
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return "unknown error";
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}
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} /* Get_Error */
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#endif
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/* -eof- */
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45
src/ngircd/resolve.h
Normal file
45
src/ngircd/resolve.h
Normal file
@ -0,0 +1,45 @@
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/*
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* ngIRCd -- The Next Generation IRC Daemon
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* Copyright (c)2001,2002 by Alexander Barton (alex@barton.de)
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*
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* Dieses Programm ist freie Software. Sie koennen es unter den Bedingungen
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* der GNU General Public License (GPL), wie von der Free Software Foundation
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* herausgegeben, weitergeben und/oder modifizieren, entweder unter Version 2
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||||
* der Lizenz oder (wenn Sie es wuenschen) jeder spaeteren Version.
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||||
* Naehere Informationen entnehmen Sie bitter der Datei COPYING. Eine Liste
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||||
* der an ngIRCd beteiligten Autoren finden Sie in der Datei AUTHORS.
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*
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* $Id: resolve.h,v 1.1 2002/05/27 11:23:27 alex Exp $
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*
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* resolve.h: asyncroner Resolver (Header)
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*/
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#ifndef __resolve_h__
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#define __resolve_h__
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#include <sys/types.h>
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#include <netinet/in.h>
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typedef struct _Res_Stat
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{
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INT pid; /* PID des Child-Prozess */
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INT pipe[2]; /* Pipe fuer IPC */
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} RES_STAT;
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GLOBAL fd_set Resolver_FDs;
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GLOBAL VOID Resolve_Init PARAMS(( VOID ));
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GLOBAL RES_STAT *Resolve_Addr PARAMS(( struct sockaddr_in *Addr ));
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GLOBAL RES_STAT *Resolve_Name PARAMS(( CHAR *Host ));
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#endif
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/* -eof- */
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