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From: "brunni at netestate dot de" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug network/17215] New: getaddrinfo with AI_CANONNAME and AF_INET causes PTR lookup
Date: Wed, 30 Jul 2014 14:00:00 -0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=17215

            Bug ID: 17215
           Summary: getaddrinfo with AI_CANONNAME and AF_INET causes PTR
                    lookup
           Product: glibc
           Version: 2.17
            Status: NEW
          Severity: normal
          Priority: P2
         Component: network
          Assignee: unassigned at sourceware dot org
          Reporter: brunni at netestate dot de

getaddrinfo makes a PTR lookup when called with ai_flags = AI_CANONNAME and
ai_family = AF_INET:

#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>

struct addrinfo hints = {.ai_flags = AI_CANONNAME, .ai_family = AF_INET};
int main (int argc, char *argv[])
{
        struct addrinfo *ap;
        int err;
        err = getaddrinfo("netestate.de", "500", &hints, &ap);
}

This is problematic for me as Javas InetAddress.getByName() works like this on
ipv4 systems and causes an unnecessary reverse lookup for every forward lookup.

It seems to be fixed in current distributions:
https://bugzilla.redhat.com/show_bug.cgi?id=714823

I get the problem when using glibc 2.17 compiled from source. Is this still an
issue with glibc 2.19?

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