Date: Mon, 26 Nov 2001 18:00:38 -0500 (EST) From: The Anarcat <anarcat@anarcat.dyndns.org> To: FreeBSD-gnats-submit@freebsd.org Subject: bin/32318: no userland tool available to test resolver facilities Message-ID: <20011126230038.0DE1120ACB@shall.anarcat.dyndns.org>
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>Number: 32318
>Category: bin
>Synopsis: no userland tool available to test resolver facilities
>Confidential: no
>Severity: non-critical
>Priority: medium
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: change-request
>Submitter-Id: current-users
>Arrival-Date: Mon Nov 26 15:10:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator: The Anarcat
>Release: FreeBSD 4.4-STABLE i386
>Organization:
Nada, Inc.
>Environment:
System: FreeBSD shall.anarcat.dyndns.org 4.4-STABLE FreeBSD 4.4-STABLE #0: Fri Nov 16 12:57:38 EST 2001 anarcat@shall.anarcat.dyndns.org:/usr/obj/usr/src/sys/SHALL i386
>Description:
Traditionally, since BIND has been part of FreeBSD for a good while, a
few basic tools are available to query the DNS servers configured on a
machine. However, no tool is available to query the resolver (in the
sense of gethostbyname/addr() routines) transparently. Host(1), dig(1),
nslookup(1) all use the name servers, and not the /etc/hosts files or
NIS/YP.
>How-To-Repeat:
Try to do a address to hostname lookup using a command line tool for an
address in /etc/hosts that will actually use gethostbyname(3). I don't
know of any such tool and a post on -questions didn't yield anything
better.
>Fix:
Possible implementation of a iplookup tool.
Chris J. Clark sent code to freebsd-questions, for a tool that would to
reverse lookups with gethostbyaddr(3). I hacked it a bit to lookup names
-> addresses in case the address isn't parsable.
See:
Message-ID: <20011126010753.E222@gohan.cjclark.org>
on -questions for the original code.
/*
* Copyright (c) 2001 Crist J. Clark
* $Id: iplookup.c,v 1.2 2001/11/26 22:01:40 anarcat 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, name_l;
char addr[24];
char **p;
for (i = 1; i < argc; i++) {
if (name_l = (inet_aton(argv[i], &a) == 0)) {
h = gethostbyname(argv[i]);
} else {
h = gethostbyaddr((char *)&a, sizeof a, AF_INET);
}
if (h == NULL)
errx(EX_OSERR, "address, %s, failed: %s",
argv[i], hstrerror(h_errno));
if (name_l) {
printf("%s: ", h->h_name);
a.s_addr = inet_addr(h->h_addr);
for (p = h->h_addr_list ; p != NULL && *p ;) {
addr[0] = '\0';
inet_ntop(h->h_addrtype, *p, addr, sizeof addr);
printf("%s",addr);
if (++p != NULL && *p) {
printf(", ");
}
}
printf("\n");
} else {
printf("%s: %s\n", argv[i], h->h_name);
}
for (p = h->h_aliases; p != NULL && *p; p++)
printf("\t%s\n", *p);
}
return 0;
}
>Release-Note:
>Audit-Trail:
>Unformatted:
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