[src/trunk]: src/lib/libc/net Handle herrors properly so that postfix can ret...

[christos <christos%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/6336f4f11531
branches:  trunk
changeset: 810789:6336f4f11531
user:      christos <christos%NetBSD.org@localhost>
date:      Tue Sep 22 14:46:09 2015 +0000

description:
Handle herrors properly so that postfix can return 4XX codes when appropriate.
Pointed out by Viktor Dukhovni.

diffstat:

 lib/libc/net/getnameinfo.c |  23 +++++++++++++++++++----
 1 files changed, 19 insertions(+), 4 deletions(-)

diffs (51 lines):

diff -r 3db199a6dfec -r 6336f4f11531 lib/libc/net/getnameinfo.c
--- a/lib/libc/net/getnameinfo.c        Tue Sep 22 13:28:02 2015 +0000
+++ b/lib/libc/net/getnameinfo.c        Tue Sep 22 14:46:09 2015 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: getnameinfo.c,v 1.57 2015/09/03 15:01:19 christos Exp $        */
+/*     $NetBSD: getnameinfo.c,v 1.58 2015/09/22 14:46:09 christos Exp $        */
 /*     $KAME: getnameinfo.c,v 1.45 2000/09/25 22:43:56 itojun Exp $    */
 
 /*
@@ -47,7 +47,7 @@
 
 #include <sys/cdefs.h>
 #if defined(LIBC_SCCS) && !defined(lint)
-__RCSID("$NetBSD: getnameinfo.c,v 1.57 2015/09/03 15:01:19 christos Exp $");
+__RCSID("$NetBSD: getnameinfo.c,v 1.58 2015/09/22 14:46:09 christos Exp $");
 #endif /* LIBC_SCCS and not lint */
 
 #ifndef RUMP_ACTION
@@ -64,6 +64,7 @@
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <arpa/nameser.h>
+#include <stdlib.h>
 #include <assert.h>
 #include <limits.h>
 #include <netdb.h>
@@ -404,8 +405,22 @@
                        }
                        strlcpy(host, hp->h_name, hostlen);
                } else {
-                       if (flags & NI_NAMEREQD)
-                               return EAI_NONAME;
+                       switch (he) {
+                       case NETDB_INTERNAL:
+                       case NO_RECOVERY:
+                               return EAI_SYSTEM;
+                       case NO_DATA:
+                       case HOST_NOT_FOUND:
+                               if (flags & NI_NAMEREQD)
+                                       return EAI_NONAME;
+                               break;
+                       case TRY_AGAIN:
+                               return EAI_AGAIN;
+                       case NETDB_SUCCESS:
+                               /*FALLTHROUGH*/
+                       default:
+                               abort();
+                       }
                        switch(afd->a_af) {
 #ifdef INET6
                        case AF_INET6: