minor bug in locate_kdc.c with getaddrinfo

[Chris Hecker]

Here's a patch for a minor WIN32 bug in the getaddrinfo return value
(called from krb5int_add_host_to_list).  getaddrinfo will return
WSANO_DATA in some cases (like an address in the hosts file that's on an
unplugged ethernet cable that was plugged in recently), but that's not
mapped to an EAI error for some reason (there's a related comment in
ws2tcpip.h that doesn't help much), so the translate function returns
EINVAL and the whole request to the KDC fails instead of just using the
other working KDCs in the list.  This patch fixes it so the unreachable
kdc is ignored.

Thanks,
Chris

PS. I also sent a test message to the security alias for another bug
report I'm going to send there, but that was my first pgp mail ever, so
I don't know if it worked (or even arrived).


=== modified file 'lib/krb5/src/lib/krb5/os/locate_kdc.c'
--- lib/krb5/src/lib/krb5/os/locate_kdc.c	2011-07-21 10:42:51 +0000
+++ lib/krb5/src/lib/krb5/os/locate_kdc.c	2011-10-15 07:21:25 +0000
@@ -163,6 +163,10 @@
     case EAI_NODATA:
 #endif
     case EAI_NONAME:
+#if _WIN32
+    case WSANO_DATA:  /* getaddrinfo can return this on destination
unreachable,
+                         but it's not mapped to an EAI_* error */
+#endif
         /* Name not known or no address data, but no error.  Do
            nothing more.  */
         return 0;