Date: Mon, 26 Nov 2001 01:07:53 -0800 From: "Crist J. Clark" <cristjc@earthlink.net> To: John Smith <anarcat@anarcat.dyndns.org> Cc: Simon Dick <simond@irrelevant.org>, Jim Conner <jconner@enterit.com>, FreeBSD Questions <freebsd-questions@FreeBSD.ORG> Subject: Re: can't do reverse dns with /etc/hosts Message-ID: <20011126010753.E222@gohan.cjclark.org> In-Reply-To: <3BFFF17E.D2E2F7C1@anarcat.dyndns.org>; from anarcat@anarcat.dyndns.org on Sat, Nov 24, 2001 at 02:14:06PM -0500 References: <5.1.0.14.0.20011123164749.0245ec60@mail.enterit.com> <20011114173647.D66694@blossom.cjclark.org> <20011115012039.GA61093@shall.anarcat.dyndns.org> <20011114173647.D66694@blossom.cjclark.org> <5.1.0.14.0.20011123164749.0245ec60@mail.enterit.com> <5.1.0.14.0.20011123172728.02c61518@mail.enterit.com> <20011124103734.GB386@irrelevant.org> <3BFFF17E.D2E2F7C1@anarcat.dyndns.org>
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On Sat, Nov 24, 2001 at 02:14:06PM -0500, John Smith wrote:
>
>
> Simon Dick wrote:
> >
> > I guess my method of just using ping <hostname> and seeing what IP it tries
> > to ping won't be suitable for this? :)
>
> no because I want to test reverse DNS.
That does not make any sense. You want to test reverse-DNS without
using DNS? ITYM, "I want to test address-to-hostname translation using
/etc/hosts."
I couldn't sleep so I wrote a quick program.
--
Crist J. Clark cjclark@alum.mit.edu
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/*
* Copyright (c) 2001 Crist J. Clark
* $Id: iplookup.c,v 1.2 2001/11/26 09:07:02 cjc Exp $
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <err.h>
#include <netdb.h>
#include <stdio.h>
#include <sysexits.h>
int main(int argc, char *argv[])
{
struct hostent *h;
struct in_addr a;
int i, j;
for (i = 1; i < argc; i++) {
if (inet_aton(argv[i], &a) == 0)
errx(EX_USAGE, "could not parse IP address: %s",
argv[i]);
if ((h = gethostbyaddr((char *)&a, sizeof a, AF_INET)) == NULL)
errx(EX_OSERR, "address, %s, failed: %s",
argv[i], hstrerror(h_errno));
printf("%s\n", h->h_name);
for (j = 0; h->h_aliases[j] != NULL; j++)
printf("\t%s\n", h->h_aliases[j]);
}
return 0;
}
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