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From: John Capo <jc@irbs.com>
Message-Id: <199605022014.QAA24130@irbs.irbs.com>
Subject: Re: Named and Reverse DNS lookups [PATCH]
To: jgreco@brasil.moneng.mei.com (Joe Greco)
Date: Thu, 2 May 1996 16:14:31 -0400 (EDT)
Cc: jdp@polstra.com, jgreco@brasil.moneng.mei.com, nate@sri.MT.net,
        hackers@freebsd.org, freebsd-isp@freebsd.org
In-Reply-To: <199605021304.IAA11378@brasil.moneng.mei.com> from Joe Greco at "May 2, 96 08:04:24 am"
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Joe Greco writes:
>
> I had reason to play with it around the time 2.1R came out, I couldn't get
> it to work, and someone on either the BIND list or the domains newsgroup
> confirmed that the BIND in FreeBSD did not support it.
> 
> I would be delighted to be proven wrong, of course, because we need things
> like this.
> 

The resolver is broken, not BIND. :-(

I've been screwing with this since yesterday thinking it was a DNS
configuration problem.  nslookup and dig worked fine but anything
that used the libc resolver did not work right.  Too close to the
forest I guess.

Anyway,  1.1.5.1 handles delegated in-addr fine as does Sun0S 4.1.3. 

goombay.irbs.com has its in-addr delegated.  Traceroute to it from
a 2.1 system and you will probably see this on the console:

    gethostby*.gethostanswer: asked for "132.75.182.199.in-addr.arpa",\
    got "132.128.75.182.199.in-addr.arpa"

Patch taken from BIND-4.9.3P1 follows.

John Capo                                                   jc@irbs.com
IRBS Engineering                       FreeBSD Servers and Workstations
(954) 792-9551                 Unix/Internet Consulting - ISP Solutions


*** /usr/stable/src/lib/libc/net/gethostbydns.c	Tue Apr 30 22:21:09 1996
--- lib/libc/net/gethostbydns.c	Thu May  2 15:57:38 1996
***************
*** 186,192 ****
--- 186,194 ----
  	int haveanswer, had_error;
  	int toobig = 0;
  	char tbuf[MAXDNAME+1];
+ 	const char *tname;
  
+ 	tname = qname;
  	host.h_name = NULL;
  	eom = answer->buf + anslen;
  	/*
***************
*** 277,282 ****
--- 279,303 ----
  			buflen -= n;
  			continue;
  		}
+ 		if (qtype == T_PTR && type == T_CNAME) {
+ 			n = dn_expand(answer->buf, eom, cp, tbuf, sizeof tbuf);
+ 			if (n < 0) {
+ 				had_error++;
+ 				continue;
+ 			}
+ 			cp += n;
+ 			/* Get canonical name. */
+ 			n = strlen(tbuf) + 1;	/* for the \0 */
+ 			if (n > buflen) {
+ 				had_error++;
+ 				continue;
+ 			}
+ 			strcpy(bp, tbuf);
+ 			tname = bp;
+ 			bp += n;
+ 			buflen -= n;
+ 			continue;
+ 		}
  		if (type != qtype) {
  			/* CNAME->PTR should not cause a log message. */
  			if (!(qtype == T_PTR && type == T_CNAME))
***************
*** 289,295 ****
  		}
  		switch (type) {
  		case T_PTR:
! 			if (strcasecmp(qname, bp) != 0) {
  				syslog(LOG_NOTICE|LOG_AUTH,
  				       AskedForGot, qname, bp);
  				cp += n;
--- 310,316 ----
  		}
  		switch (type) {
  		case T_PTR:
! 			if (strcasecmp(tname, bp) != 0) {
  				syslog(LOG_NOTICE|LOG_AUTH,
  				       AskedForGot, qname, bp);
  				cp += n;