freebsd-src/usr.sbin/ypserv/yp_dnslookup.c
Peter Wemm f1c72c4c70 Hmm, well, whaddya know? ypserv was making calls to the undocumented
private internal _gethostbydnsname() resolver functions..
1996-08-30 01:17:47 +00:00

113 lines
3.5 KiB
C

/*
* Copyright (c) 1995
* Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Bill Paul.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $Id: yp_dnslookup.c,v 1.2 1996/05/31 16:01:49 wpaul Exp $
*/
/*
* Do standard and reverse DNS lookups using the resolver library.
* Take care of all the dirty work here so the main program only has to
* pass us a pointer to an array of characters.
*
* We have to use direct resolver calls here otherwise the YP server
* could end up looping by calling itself over and over again until
* it disappeared up its own belly button.
*/
#include <sys/types.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <sys/param.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include "yp_extern.h"
#ifndef lint
static const char rcsid[] = "$Id: yp_dnslookup.c,v 1.2 1996/05/31 16:01:49 wpaul Exp $";
#endif
static char *parse(hp)
struct hostent *hp;
{
static char result[MAXHOSTNAMELEN * 2];
int len,i;
struct in_addr addr;
len = 16 + strlen(hp->h_name);
for (i = 0; hp->h_aliases[i]; i++)
len += strlen(hp->h_aliases[i]) + 1;
bzero(result, sizeof(result));
bcopy(hp->h_addr, &addr, sizeof(struct in_addr));
snprintf(result, sizeof(result), "%s %s", inet_ntoa(addr), hp->h_name);
for (i = 0; hp->h_aliases[i]; i++) {
strcat(result, " ");
strcat(result, hp->h_aliases[i]);
}
return ((char *)&result);
}
char *yp_dnsname(address)
char *address;
{
struct hostent *hp;
if (strchr(address, '@'))
return (NULL);
if ((hp = (struct hostent *)_gethostbydnsname(address, AF_INET)) == NULL)
return (NULL);
return(parse(hp));
}
char *yp_dnsaddr(address)
const char *address;
{
struct hostent *hp;
struct in_addr addr;
if (strchr(address, '@'))
return (NULL);
if (!inet_aton(address, &addr))
return (NULL);
if ((hp = (struct hostent *)_gethostbydnsaddr((const char *)&addr,
sizeof(unsigned long), AF_INET)) == NULL)
return (NULL);
return(parse(hp));
}