getaddrinfo bug: hosts without A rekords

[Artur Frysiak <wiget at pld dot org dot pl>]

>Submitter-Id:	net
>Originator:	Artur Frysiak
>Organization:  PLD
>Confidential:	no
>Synopsis:	getaddrinfo don't return AAAA rekord is host not have A rekords
>Severity:	serious 
>Priority:	medium
>Category:	libc
>Class:		sw-bug 
>Release:	libc-2.1.2
>Environment:
	i686-pld-linux-gnu
	glibc 2.1.2 with lates patches for getaddrinfo.c and dns-host.c 
	 obtained via cvsweb
Host type: i686-pld-linux-gnu
System: Linux wiget 2.2.13 #1 sob Nov 27 11:51:29 CET 1999 i686 pld
Architecture: i686

Addons: crypt linuxthreads
Build CFLAGS: -O2 -Wall -Winline -Wstrict-prototypes -Wwrite-strings -mpentiumpro
Build CC: gcc
Compiler version: 2.95.2 19991024 (release)
Kernel headers: 2.2.13
Symbol versioning: yes
Build static: yes
Build shared: yes
Build pic-default: no
Build profile: yes
Build omitfp: no
Build bounded: no
Build static-nss: no
Stdio: libio

>Description:
getaddrinfo returns "No address associated with hostname" if host have AAAA 
rekords but don't have A rekords.

>How-To-Repeat:
Run this test program:
------ cut ------
/*
 * wiget@wiget wiget$ host -t any wiget.ipv6.t17.dhs.org.
 * wiget.ipv6.t17.dhs.org mail is handled (pri=10) by wiget.ipv6.t17.dhs.org
 * wiget.ipv6.t17.dhs.org mail is handled (pri=20) by wiget.t17.dhs.org
 * wiget.ipv6.t17.dhs.org host information Intel/Pentium75 Linux 2.2
 * wiget.ipv6.t17.dhs.org IPv6 address 3ffe:902:11:17::1:10
 *
 */

#include <stdio.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>

int main()
{

  struct addrinfo hints, *ai, *aitop;
  int gaierr;
  char addr[100];
  
  memset(&hints, 0, sizeof(hints));
  hints.ai_family = PF_UNSPEC;
  hints.ai_socktype = SOCK_STREAM;
  if ((gaierr = getaddrinfo("wiget.ipv6.t17.dhs.org", "54321", &hints, &aitop)) != 0) { 
	  printf("Error\t%s\n", gai_strerror(gaierr));
	  exit(1);
  }
  
  for (ai = aitop; ai; ai = ai->ai_next) {
	  if (ai->ai_family == AF_UNIX)
		  continue;
	  getnameinfo(ai->ai_addr, ai->ai_addrlen, addr, sizeof(addr),
			 NULL, 0, NI_NUMERICHOST);
	  printf("Returned address:\t%s\n", addr);
  }
  freeaddrinfo(aitop);
}
------ cut ------
wiget@wiget wiget$ ./gtest 
Error   No address associated with hostname

>Fix: