Launchpad has imported 3 comments from the remote bug at https://bugzilla.redhat.com/show_bug.cgi?id=714823.
If you reply to an imported comment from within Launchpad, your comment will be sent to the remote bug automatically. Read more about Launchpad's inter-bugtracker facilities at https://help.launchpad.net/InterBugTracking. ------------------------------------------------------------------------ On 2011-06-20T21:40:53+00:00 Simo wrote: We have verified that getaddrinfo() does reverse address calls to DNS when AI_CANONNAME is passed in hints.ai_flags and returns the PTR name of the forward resolved ip address as Canonical name. The canonical name is arguably not what is returned by the PTR record for various reasons. Aside the fact that PTR record are often not under control of the the same people that control the A name, A names can also be roundrobin names and return multiple addresses. Picking one and returnings its PTR as canonical name seem highly questionable. A CNAME -> A name resolution is welcome as the A name is arguably the Canonical name of a CNAME. But getaddrinfo shouldn't do PTR requests to the DNS. We found this when testing ssh+GSSAPI auth on laptops that can properly set the A record for their name usin dynamic DNS updates but cannot change the PTR record of whatever network they are currently travelling in. This breaks kerberos which needs the canonical (A record) name to construct the principal name used to request a ticket when rdns = false is set in krb5.conf and GSSAPITrustDNS is set to no in ssh (the default). Reply at: https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1057526/comments/0 ------------------------------------------------------------------------ On 2011-06-20T22:33:00+00:00 Marko wrote: It turned out that setting ai_family triggers this behaviour. When calling getaddrinfo with ai_flags = AI_CANONNAME, ai_family = AF_UNSPEC then the ai_canonname returned is as expected. When calling getaddrinfo with ai_flags = AI_CANONNAME, ai_family = AF_INET then the ai_canonname returned contains the PTR name of the forward resolved IP address as described in comment 0. Reply at: https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1057526/comments/1 ------------------------------------------------------------------------ On 2011-12-06T17:47:52+00:00 errata-xmlrpc wrote: Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. http://rhn.redhat.com/errata/RHSA-2011-1526.html Reply at: https://bugs.launchpad.net/ubuntu/+source/eglibc/+bug/1057526/comments/2 ** Changed in: eglibc (Fedora) Status: Unknown => Fix Released ** Changed in: eglibc (Fedora) Importance: Unknown => Undecided -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1057526 Title: getaddrinfo returns PTR name in ai_canonname when using DNS To manage notifications about this bug go to: https://bugs.launchpad.net/eglibc/+bug/1057526/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
