[Bug libc/7060] New: getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[Bug libc/7060] New: getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[bero at arklinux dot org]

Up until glibc 2.8, this would work and return the IPv4 address:

struct addrinfo hints, *ai, *aitop;
int err;
char *host=strdup("www.google.com");
char *port=strdup("80");
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
err=getaddrinfo(host, port, &hints, &aitop);
if(err)
    fprintf(stderr, "Error: %s", strerror(err));


In glibc 2.9, it returns Error: Name or service not known
Changing hints.ai_family to PF_INET makes it work with glibc 2.9.

I'm not sure which behavior is correct, but 2.9's does break a few 
applications (ncftp for one).

This is on an IPv4 machine (with an IPv6 address for localhost set); 
nsswitch.conf has "hosts: files mdns dns"

-- 
           Summary: getaddrinfo() with hints.ai_family = PF_UNSPEC changes
                    behavior in glibc 2.9
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: libc
        AssignedTo: drepper at redhat dot com
        ReportedBy: bero at arklinux dot org
                CC: glibc-bugs at sources dot redhat dot com
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


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[Bug libc/7060] getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[bero at arklinux dot org]

------- Additional Comments From bero at arklinux dot org  2008-12-01 14:17 -------
This works as before in 2.9 for hostnames that are listed in /etc/hosts; it 
only fails if it has to look up stuff on the DNS.

The DNS itself works (applications that don't use getaddrinfo(), such as host, 
ping, konqueror, firefox, ... keep working).

-- 


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[Bug libc/7060] getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[jakub at redhat dot com]

------- Additional Comments From jakub at redhat dot com  2008-12-01 14:31 -------
What nameserver are you using?  Most likely a DNS server bug.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |WAITING


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[Bug libc/7060] getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[bero at arklinux dot org]

------- Additional Comments From bero at arklinux dot org  2008-12-01 15:40 -------
The DNS is the internal DNS of a Netopia 3346N-VGx DSL modem, revision 
7.7.4r1.

Modifying /etc/resolv.conf to point at a Linux box running bind 9.5.x does fix 
it.

A workaround is probably needed though, Netopia 3346N-VGx DSL modems come with 
every Swisscom DSL line for free...

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW


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[Bug libc/7060] getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[bero at arklinux dot org]

------- Additional Comments From bero at arklinux dot org  2008-12-01 15:51 -------
Created an attachment (id=3084)
 --> (http://sourceware.org/bugzilla/attachment.cgi?id=3084&action=view)
Patch that fixes it by reverting to 2.8 behavior

The attached patch fixes it by reverting most of getaddrinfo.c to what it was
in glibc 2.8 -- not quite the right thing to do, but I can confirm it fixes the
problem.

-- 


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[Bug libc/7060] getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[vapier at gentoo dot org]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |toolchain at gentoo dot org


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[Bug libc/7060] getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[jgc at archlinux dot org]

------- Additional Comments From jgc at archlinux dot org  2008-12-03 07:43 -------
I'm also facing this bug when using the Hotbrick LB2 as DNS server. Disabling
ipv6 on my system fixes this problem. Installing a local recursor like
pdns-recursor also fixes this issue, so it's related to broken DNS servers.

with pdns-recursor:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21282
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;redhat.com.			IN	AAAA

;; AUTHORITY SECTION:
redhat.com.		600	IN	SOA	ns1.redhat.com. noc.redhat.com. 2008112502 3600 1800
604800 86400

Result with Hotbrick LB2:
;; ->>HEADER<<- opcode: QUERY, status: NOTIMP, id: 51617
;; flags: rd; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; WARNING: recursion requested but not available

;; QUESTION SECTION:
;redhat.com.			IN	AAAA

The hotbrick LB2 returns NOTIMP, which violates the RFC.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jgc at archlinux dot org


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[Bug libc/7060] getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[pasky at suse dot cz]

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pasky at suse dot cz


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[Bug libc/7060] getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[pasky at suse dot cz]

------- Additional Comments From pasky at suse dot cz  2009-01-09 04:51 -------
Note that a simpler workaround is to just disable the gethostbyname4() lookup
method being exported, as Jakub Jelinek did for Fedora (and me doing for SUSE now):

http://pasky.or.cz/~pasky/dev/glibc/glibc-2.10-dns-no-gethostbyname4.diff

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[Bug libc/7060] getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[jakub at redhat dot com]

------- Additional Comments From jakub at redhat dot com  2009-01-09 08:09 -------
Also note that it is just a temporary measure, Ulrich plans to work on the
resolv code soon.

-- 


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[Bug libc/7060] getaddrinfo() with hints.ai_family = PF_UNSPEC changes behavior in glibc 2.9

[schwab at linux-m68k dot org]

------- Additional Comments From schwab at linux-m68k dot org  2010-08-31 11:09 -------
Should be fixed in 2.10.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


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