From: Gregory Neil Shapiro <gshapiro@WPI.EDU>
Date: Fri, 28 Jan 1994 16:20:42 -0500
Message-Id: <199401282120.QAA14847@monkeyboy.WPI.EDU>
To: bind-workers@vix.com
Cc: aej@WPI.EDU
Subject: BIND 4.9.2 BETA05 resolver problem

We have a major problem with replacing Ultrix's resolver routines with
those in 4.9.2 Beta 5.

Here at WPI we used Hesiod to serve our passwords.  4.9.2's resolver
doesn't go to secondaries for the information if the first nameserver
listed in /etc/resolv.conf isn't responding (i.e. if it dies, the host is
down, or the nameserver is reloading) on any getpw*() call.

Here is my /etc/resolv.conf:

;
; BIND data file.
;
domain		WPI.EDU
nameserver	130.215.24.62
nameserver	130.215.24.56
nameserver	130.215.56.45
nameserver	130.215.8.125

Here is a program to show the broken behavior:

#include <sys/param.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <arpa/nameser.h>
#include <stdio.h>
#include <resolv.h>
#include <unistd.h>
#include <stdlib.h>
#include <netdb.h>

main()
{
  printf("res.options = %x\n", _res.options);
  if (getpwnam("gshapiro"))
    printf("Ok\n");
  else
    printf("No\n");
  if (gethostbyname("wpi"))
    printf("Ok\n");
  else
    printf("No\n");
}

If I compile with 4.9.2's resolver:

> cc -I/usr/local/include -I/usr0/CCCtools/BIND/4.9.2/include -I/usr0/CCCtools/BIND/4.9.2/compat/include try.c -o try -lresolv -l44bsd

And run it:

> ./try                                                       
res.options = 2c0
No
Ok

If I compile with Ultrix's resolver (built-in to libc.a):

> cc try.c -o try
> ./try
res.options = 2c0
Ok
Ok

4.9.2's resolver doesn't go on to secondaries on the getpw*() call.
However, gethostbyname() calls do properly go to secondaries, it's only the
Hesiod getpw*() calls that fail.