r18006: Actually a smaller change than it looks. Leverage

the get_dc_list code to get the _kerberos. names
for site support. This way we don't depend on one
KDC to do ticket refresh. Even though we know it's
up when we add it, it may go down when we're trying
to refresh.
Jeremy.
(This used to be commit 77fe2a3d7418012a8dbfb6aaeb2a8dd57c6e1a5d)

1 files changed, 58 insertions, 7 deletions

diff --git a/source3/libsmb/namequery.c b/source3/libsmb/namequery.c
index 4c361a37165..af3ac319cc2 100644
--- a/source3/libsmb/namequery.c
+++ b/source3/libsmb/namequery.c
@@ -1030,7 +1030,7 @@ static BOOL resolve_ads(const char *name, int name_type,
 	int			numdcs = 0;
 	int			numaddrs = 0;
 
-	if ( name_type != 0x1c )
+	if ((name_type != 0x1c) && (name_type != KDC_NAME_TYPE))
 		return False;
 		
 	DEBUG(5,("resolve_hosts: Attempting to resolve DC's for %s using DNS\n",
@@ -1040,8 +1040,12 @@ static BOOL resolve_ads(const char *name, int name_type,
 		DEBUG(0,("resolve_ads: talloc_init() failed!\n"));
 		return False;
 	}
-		
-	status = ads_dns_query_dcs( ctx, name, &dcs, &numdcs );
+
+	if (name_type == KDC_NAME_TYPE) {
+		status = ads_dns_query_kdcs(ctx, name, &dcs, &numdcs);
+	} else {
+		status = ads_dns_query_dcs(ctx, name, &dcs, &numdcs);
+	}
 	if ( !NT_STATUS_IS_OK( status ) ) {
 		talloc_destroy(ctx);
 		return False;
@@ -1188,6 +1192,13 @@ BOOL internal_resolve_name(const char *name, int name_type,
 				result = True;
 				goto done;
 			}
+		} else if(strequal( tok, "kdc")) {
+			/* deal with KDC_NAME_TYPE names here.  This will result in a
+				SRV record lookup */
+			if (resolve_ads(name, KDC_NAME_TYPE, return_iplist, return_count)) {
+				result = True;
+				goto done;
+			}
 		} else if(strequal( tok, "ads")) {
 			/* deal with 0x1c names here.  This will result in a
 				SRV record lookup */
@@ -1355,13 +1366,17 @@ BOOL get_pdc_ip(const char *domain, struct in_addr *ip)
 	return True;
 }
 
+/* Private enum type for lookups. */
+
+enum dc_lookup_type { DC_NORMAL_LOOKUP, DC_ADS_ONLY, DC_KDC_ONLY };
+
 /********************************************************
  Get the IP address list of the domain controllers for
  a domain.
 *********************************************************/
 
 static NTSTATUS get_dc_list(const char *domain, struct ip_service **ip_list, 
-                            int *count, BOOL ads_only, int *ordered)
+                            int *count, enum dc_lookup_type lookup_type, int *ordered)
 {
 	fstring resolve_order;
 	char *saf_servername;
@@ -1387,7 +1402,7 @@ static NTSTATUS get_dc_list(const char *domain, struct ip_service **ip_list,
 
 	fstrcpy( resolve_order, lp_name_resolve_order() );
 	strlower_m( resolve_order );
-	if ( ads_only )  {
+	if ( lookup_type == DC_ADS_ONLY)  {
 		if ( strstr( resolve_order, "host" ) ) {
 			fstrcpy( resolve_order, "ads" );
 
@@ -1397,6 +1412,11 @@ static NTSTATUS get_dc_list(const char *domain, struct ip_service **ip_list,
 		} else {
                         fstrcpy( resolve_order, "NULL" );
 		}
+	} else if (lookup_type == DC_KDC_ONLY) {
+		/* DNS SRV lookups used by the ads/kdc resolver
+		   are already sorted by priority and weight */
+		*ordered = True;
+		fstrcpy( resolve_order, "kdc" );
 	}
 
 	/* fetch the server we have affinity for.  Add the 
@@ -1558,11 +1578,16 @@ NTSTATUS get_sorted_dc_list( const char *domain, struct ip_service **ip_list, in
 {
 	BOOL ordered;
 	NTSTATUS status;
-	
+	enum dc_lookup_type lookup_type = DC_NORMAL_LOOKUP;
+
 	DEBUG(8,("get_sorted_dc_list: attempting lookup using [%s]\n",
 		(ads_only ? "ads" : lp_name_resolve_order())));
 	
-	status = get_dc_list(domain, ip_list, count, ads_only, &ordered);
+	if (ads_only) {
+		lookup_type = DC_ADS_ONLY;
+	}
+
+	status = get_dc_list(domain, ip_list, count, lookup_type, &ordered);
 	if (!NT_STATUS_IS_OK(status)) {
 		return status; 
 	}
@@ -1574,3 +1599,29 @@ NTSTATUS get_sorted_dc_list( const char *domain, struct ip_service **ip_list, in
 		
 	return NT_STATUS_OK;
 }
+
+/*********************************************************************
+ Get the KDC list - re-use all the logic in get_dc_list.
+*********************************************************************/
+
+NTSTATUS get_kdc_list( const char *realm, struct ip_service **ip_list, int *count)
+{
+	BOOL ordered;
+	NTSTATUS status;
+
+	*count = 0;
+	*ip_list = NULL;
+
+	status = get_dc_list(realm, ip_list, count, DC_KDC_ONLY, &ordered);
+
+	if (!NT_STATUS_IS_OK(status)) {
+		return status; 
+	}
+
+	/* only sort if we don't already have an ordered list */
+	if ( !ordered ) {
+		sort_ip_list2( *ip_list, *count );
+	}
+
+	return NT_STATUS_OK;
+}