query ip6.arpa then ip6.int for IPv6 reverse lookup. follows RFC3152.

(need some string-manipulation cleanup near here)

1 files changed, 8 insertions, 2 deletions

diff --git a/src/lib/libc/net/gethostnamadr.c b/src/lib/libc/net/gethostnamadr.c
index f1aa448670..dae31eaedb 100644
--- a/src/lib/libc/net/gethostnamadr.c
+++ b/src/lib/libc/net/gethostnamadr.c
@@ -52,7 +52,7 @@
  */
 
 #if defined(LIBC_SCCS) && !defined(lint)
-static char rcsid[] = "$OpenBSD: gethostnamadr.c,v 1.49 2002/07/25 21:13:45 deraadt Exp $";
+static char rcsid[] = "$OpenBSD: gethostnamadr.c,v 1.50 2002/07/29 10:15:30 itojun Exp $";
 #endif /* LIBC_SCCS and not lint */
 
 #include <sys/param.h>
@@ -713,7 +713,6 @@ gethostbyaddr(addr, len, af)
                         qp += sprintf(qp, "%x.%x.",
                             uaddr[n] & 0xf, (uaddr[n] >> 4) & 0xf);
                 }
-                strcpy(qp, "ip6.int");
                 break;
         }
 
@@ -732,8 +731,15 @@ gethostbyaddr(addr, len, af)
                         break;
 #endif
                 case 'b':
+                        if (af == AF_INET6)
+                                strcpy(qp, "ip6.arpa");
                         n = res_query(qbuf, C_IN, T_PTR, (u_char *)buf.buf,
                             sizeof buf.buf);
+                        if (n < 0 && af == AF_INET6) {
+                                strcpy(qp, "ip6.int");
+                                n = res_query(qbuf, C_IN, T_PTR,
+                                    (u_char *)buf.buf, sizeof buf.buf);
+                        }
                         if (n < 0) {
 #ifdef DEBUG
                                 if (_res.options & RES_DEBUG)