krb5 commit [krb5-1.10]: In sn2princ, getaddrinfo without AI_ADDRCONFIG

[Tom Yu]

https://github.com/krb5/krb5/commit/57738b357e8b03bcb7af2f147c97cb84d0ce96e2
commit 57738b357e8b03bcb7af2f147c97cb84d0ce96e2
Author: Greg Hudson <ghudson at mit.edu>
Date:   Thu May 3 15:15:51 2012 +0000

    In sn2princ, getaddrinfo without AI_ADDRCONFIG
    
    When canonicalizing a principal, use AI_CANONNAME alone in the hint
    flags for getaddrinfo, for two reasons.  First, it works around a gnu
    libc bug where getaddrinfo does a PTR lookup for the canonical name
    (we tried to work around this in r24977 bug the addition of
    AI_ADDRCONFIG caused the same problem as the use of AF_INET).  Second,
    an IPv4-only host should be able create a principal for an IPv6-only
    host even if it can't contact the host.
    
    This does result in extra AAAA queries in the common case (IPv4-only
    host contacting IPv4-only service), which is unfortunate.  But we need
    to leave that optimization up to the platform at this point.
    
    (cherry picked from commit c3ab5fe0b01a68b14d5657740006488721b48b7b)
    
    ticket: 7124
    version_fixed: 1.10.2
    status: resolved

 src/lib/krb5/os/sn2princ.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/src/lib/krb5/os/sn2princ.c b/src/lib/krb5/os/sn2princ.c
index 1bee5ae..f149feb 100644
--- a/src/lib/krb5/os/sn2princ.c
+++ b/src/lib/krb5/os/sn2princ.c
@@ -105,7 +105,7 @@ krb5_sname_to_principal(krb5_context context, const char *hostname, const char *
                hostnames associated.  */
 
             memset(&hints, 0, sizeof(hints));
-            hints.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
+            hints.ai_flags = AI_CANONNAME;
             err = getaddrinfo(hostname, 0, &hints, &ai);
             if (err) {
 #ifdef DEBUG_REFERRALS