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From: John Capo <jc@irbs.com>
Message-Id: <199605210614.CAA22689@irbs.irbs.com>
Subject: Re: DNS question
To: nate@sri.MT.net (Nate Williams)
Date: Tue, 21 May 1996 02:14:26 -0400 (EDT)
Cc: hackers@FreeBSD.org
In-Reply-To: <199605200307.VAA04583@rocky.sri.MT.net> from Nate Williams at "May 19, 96 09:07:58 pm"
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Nate Williams writes:
> 
> Name:    ns.mt.sri.com
> Address:  206.127.76.97
> Aliases:  97.76.127.206.in-addr.arpa
> 
> > gateway:/etc/namedb/new # host 206.127.76.97
> Host not found, try again.
> 

I'll bet you have some log messages that look sort of like this:

host: gethostby*.gethostanswer: asked for "131.75.182.199.in-addr.arpa", \
    got "131.128.75.182.199.in-addr.arpa"

The libc resolver is broken for non-terminal in-addr lookups.

*** /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;


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