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authorUlrich Drepper <drepper@redhat.com>1999-10-01 21:42:39 +0000
committerUlrich Drepper <drepper@redhat.com>1999-10-01 21:42:39 +0000
commit20cc4c87c02444b5836052fac76a57895c3b5f87 (patch)
treec50375227c44e1977c46287e576928641d66f060 /resolv
parenta7123f0edfea20a68e64e447dc6ca0c32736be0e (diff)
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Update.
1999-10-01  Ulrich Drepper  <drepper@cygnus.com>

	* resolv/nss_dns/dns-host.c (_nss_dns_gethostbyaddr_r): Align
	handling of IPv6 tunnel address handling with bind 8.2.1.  Allow
	len argument to be greater than needed address size.
Diffstat (limited to 'resolv')
-rw-r--r--resolv/nss_dns/dns-host.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/resolv/nss_dns/dns-host.c b/resolv/nss_dns/dns-host.c
index c075961e91..482cbd3ab4 100644
--- a/resolv/nss_dns/dns-host.c
+++ b/resolv/nss_dns/dns-host.c
@@ -197,6 +197,7 @@ _nss_dns_gethostbyaddr_r (const char *addr, size_t len, int af,
 {
   static const u_char mapped[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0xff,0xff };
   static const u_char tunnelled[] = { 0,0, 0,0, 0,0, 0,0, 0,0, 0,0 };
+  static const u_char v6local[] = { 0,0, 0,1 };
   const u_char *uaddr = (const u_char *)addr;
   struct host_data
   {
@@ -210,9 +211,10 @@ _nss_dns_gethostbyaddr_r (const char *addr, size_t len, int af,
   size_t size;
   int n, status;
 
-  if (af == AF_INET6 && len == IN6ADDRSZ &&
-      (memcmp (uaddr, mapped, sizeof mapped) == 0
-       || memcmp (uaddr, tunnelled, sizeof tunnelled) == 0))
+  if (af == AF_INET6 && len == IN6ADDRSZ
+      && (memcmp (uaddr, mapped, sizeof mapped) == 0
+	  || (memcmp (uaddr, tunnelled, sizeof tunnelled) == 0
+	      && memcmp (&uaddr[sizeof tunnelled], v6local, sizeof v6local))))
     {
       /* Unmap. */
       addr += sizeof mapped;
@@ -234,7 +236,7 @@ _nss_dns_gethostbyaddr_r (const char *addr, size_t len, int af,
       *h_errnop = NETDB_INTERNAL;
       return NSS_STATUS_UNAVAIL;
     }
-  if (size != len)
+  if (size > len)
     {
       *errnop = EAFNOSUPPORT;
       *h_errnop = NETDB_INTERNAL;