Copyright (C) Tim Potter 2001
Copyright (C) Andrew Bartlett 2002
-
+ Copyright (C) Gerald Carter 2003
+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 2 of the License, or
+ the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
-
+
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
-
+
You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
-
-
-#define FAILED_CONNECTION_CACHE_TIMEOUT 30 /* Seconds between attempts */
-
-struct failed_connection_cache {
- fstring domain_name;
- fstring controller;
- time_t lookup_time;
- NTSTATUS nt_status;
- struct failed_connection_cache *prev, *next;
-};
-
-static struct failed_connection_cache *failed_connection_cache;
+#include "libads/sitename_cache.h"
+#include "ads.h"
+#include "../librpc/gen_ndr/nbt.h"
+#include "lib/param/loadparm.h"
/**********************************************************************
- Check for a previously failed connection
+ Is this our primary domain ?
**********************************************************************/
-static NTSTATUS check_negative_conn_cache( const char *domain, const char *server )
+#ifdef HAVE_KRB5
+static bool is_our_primary_domain(const char *domain)
{
- struct failed_connection_cache *fcc;
- NTSTATUS result = NT_STATUS_UNSUCCESSFUL;
-
- /* can't check if we don't have strings */
-
- if ( !domain || !server )
- return NT_STATUS_OK;
-
- for (fcc = failed_connection_cache; fcc; fcc = fcc->next) {
-
- /*
- * we have a match IFF the domain and server name matches
- * (a) the domain matches,
- * (b) the IP address matches (if we have one)
- * (c) the server name (if specified) matches
- */
-
- if ( !strequal(domain, fcc->domain_name) || !strequal(server, fcc->controller) )
- continue; /* no match; check the next entry */
-
- /* we have a match so see if it is still current */
-
- if ((time(NULL) - fcc->lookup_time) > FAILED_CONNECTION_CACHE_TIMEOUT)
- {
- /* Cache entry has expired, delete it */
-
- DEBUG(10, ("check_negative_conn_cache: cache entry expired for %s, %s\n",
- domain, server ));
-
- DLIST_REMOVE(failed_connection_cache, fcc);
- SAFE_FREE(fcc);
-
- return NT_STATUS_OK;
- }
+ int role = lp_server_role();
- /* The timeout hasn't expired yet so return false */
-
- DEBUG(10, ("check_negative_conn_cache: returning negative entry for %s, %s\n",
- domain, server ));
-
- result = fcc->nt_status;
- return result;
+ if ((role == ROLE_DOMAIN_MEMBER) && strequal(lp_workgroup(), domain)) {
+ return True;
+ } else if (strequal(get_global_sam_name(), domain)) {
+ return True;
}
-
- /* end of function means no cache entry */
- return NT_STATUS_OK;
+ return False;
}
+#endif
-/**********************************************************************
- Add an entry to the failed conneciton cache
-**********************************************************************/
+/**************************************************************************
+ Find the name and IP address for a server in the realm/domain
+ *************************************************************************/
-void add_failed_connection_entry(const char *domain, const char *server, NTSTATUS result)
+static bool ads_dc_name(const char *domain,
+ const char *realm,
+ struct sockaddr_storage *dc_ss,
+ fstring srv_name)
{
- struct failed_connection_cache *fcc;
+ ADS_STRUCT *ads;
+ char *sitename;
+ int i;
+ char addr[INET6_ADDRSTRLEN];
- SMB_ASSERT(!NT_STATUS_IS_OK(result));
+ if (!realm && strequal(domain, lp_workgroup())) {
+ realm = lp_realm();
+ }
- /* Check we already aren't in the cache. We always have to have
- a domain, but maybe not a specific DC name. */
+ sitename = sitename_fetch(talloc_tos(), realm);
- for (fcc = failed_connection_cache; fcc; fcc = fcc->next) {
- if ( strequal(fcc->domain_name, domain) && strequal(fcc->controller, server) )
- {
- DEBUG(10, ("add_failed_connection_entry: domain %s (%s) already tried and failed\n",
- domain, server ));
- return;
+ /* Try this 3 times then give up. */
+ for( i =0 ; i < 3; i++) {
+ ads = ads_init(realm, domain, NULL);
+ if (!ads) {
+ TALLOC_FREE(sitename);
+ return False;
}
- }
- /* Create negative lookup cache entry for this domain and controller */
+ DEBUG(4,("ads_dc_name: domain=%s\n", domain));
- if ( !(fcc = (struct failed_connection_cache *)malloc(sizeof(struct failed_connection_cache))) )
- {
- DEBUG(0, ("malloc failed in add_failed_connection_entry!\n"));
- return;
- }
-
- ZERO_STRUCTP(fcc);
-
- fstrcpy( fcc->domain_name, domain );
- fstrcpy( fcc->controller, server );
- fcc->lookup_time = time(NULL);
- fcc->nt_status = result;
-
- DEBUG(10,("add_failed_connection_entry: added domain %s (%s) to failed conn cache\n",
- domain, server ));
-
- DLIST_ADD(failed_connection_cache, fcc);
-}
+#ifdef HAVE_ADS
+ /* we don't need to bind, just connect */
+ ads->auth.flags |= ADS_AUTH_NO_BIND;
+ ads_connect(ads);
+#endif
-/****************************************************************************
-****************************************************************************/
-
-void flush_negative_conn_cache( void )
-{
- struct failed_connection_cache *fcc;
-
- fcc = failed_connection_cache;
+ if (!ads->config.realm) {
+ TALLOC_FREE(sitename);
+ ads_destroy(&ads);
+ return False;
+ }
- while (fcc) {
- struct failed_connection_cache *fcc_next;
+ /* Now we've found a server, see if our sitename
+ has changed. If so, we need to re-do the DNS query
+ to ensure we only find servers in our site. */
+
+ if (stored_sitename_changed(realm, sitename)) {
+ TALLOC_FREE(sitename);
+ sitename = sitename_fetch(talloc_tos(), realm);
+ ads_destroy(&ads);
+ /* Ensure we don't cache the DC we just connected to. */
+ namecache_delete(realm, 0x1C);
+ namecache_delete(domain, 0x1C);
+ continue;
+ }
- fcc_next = fcc->next;
- DLIST_REMOVE(failed_connection_cache, fcc);
- free(fcc);
+#ifdef HAVE_ADS
+ if (is_our_primary_domain(domain) && (ads->config.flags & NBT_SERVER_KDC)) {
+ if (ads_closest_dc(ads)) {
+ /* We're going to use this KDC for this realm/domain.
+ If we are using sites, then force the krb5 libs
+ to use this KDC. */
+
+ create_local_private_krb5_conf_for_domain(realm,
+ domain,
+ sitename,
+ &ads->ldap.ss);
+ } else {
+ create_local_private_krb5_conf_for_domain(realm,
+ domain,
+ NULL,
+ &ads->ldap.ss);
+ }
+ }
+#endif
+ break;
+ }
- fcc = fcc_next;
+ if (i == 3) {
+ DEBUG(1,("ads_dc_name: sitename (now \"%s\") keeps changing ???\n",
+ sitename ? sitename : ""));
+ TALLOC_FREE(sitename);
+ ads_destroy(&ads);
+ return False;
}
+ TALLOC_FREE(sitename);
+
+ fstrcpy(srv_name, ads->config.ldap_server_name);
+ if (!strupper_m(srv_name)) {
+ ads_destroy(&ads);
+ return false;
+ }
+#ifdef HAVE_ADS
+ *dc_ss = ads->ldap.ss;
+#else
+ zero_sockaddr(dc_ss);
+#endif
+ ads_destroy(&ads);
+
+ print_sockaddr(addr, sizeof(addr), dc_ss);
+ DEBUG(4,("ads_dc_name: using server='%s' IP=%s\n",
+ srv_name, addr));
+
+ return True;
}
/****************************************************************************
- Utility function to return the name of a DC. The name is guaranteed to be
- valid since we have already done a name_status_find on it
+ Utility function to return the name of a DC. The name is guaranteed to be
+ valid since we have already done a name_status_find on it
***************************************************************************/
-BOOL rpc_dc_name(const char *domain, fstring srv_name, struct in_addr *ip_out)
+static bool rpc_dc_name(const char *domain,
+ fstring srv_name,
+ struct sockaddr_storage *ss_out)
{
- struct in_addr *ip_list = NULL, dc_ip, exclude_ip;
+ struct ip_service *ip_list = NULL;
+ struct sockaddr_storage dc_ss;
int count, i;
- BOOL list_ordered;
- BOOL use_pdc_only;
NTSTATUS result;
-
- zero_ip(&exclude_ip);
-
- use_pdc_only = must_use_pdc(domain);
-
- /* Lookup domain controller name */
-
- if ( use_pdc_only && get_pdc_ip(domain, &dc_ip) )
- {
- DEBUG(10,("rpc_dc_name: Atempting to lookup PDC to avoid sam sync delays\n"));
-
- /* check the connection cache and perform the node status
- lookup only if the IP is not found to be bad */
-
- if (name_status_find(domain, 0x1c, 0x20, dc_ip, srv_name) ) {
- result = check_negative_conn_cache( domain, srv_name );
- if ( NT_STATUS_IS_OK(result) )
- goto done;
- }
- /* Didn't get name, remember not to talk to this DC. */
- exclude_ip = dc_ip;
- }
+ char addr[INET6_ADDRSTRLEN];
/* get a list of all domain controllers */
-
- if (!get_dc_list( domain, &ip_list, &count, &list_ordered) ) {
+
+ if (!NT_STATUS_IS_OK(get_sorted_dc_list(domain, NULL, &ip_list, &count,
+ False))) {
DEBUG(3, ("Could not look up dc's for domain %s\n", domain));
return False;
}
/* Remove the entry we've already failed with (should be the PDC). */
- if ( use_pdc_only ) {
- for (i = 0; i < count; i++) {
- if (ip_equal( exclude_ip, ip_list[i]))
- zero_ip(&ip_list[i]);
- }
- }
-
- /* Pick a nice close server, but only if the list was not ordered */
-
- if (!list_ordered && (count > 1) ) {
- qsort(ip_list, count, sizeof(struct in_addr), QSORT_CAST ip_compare);
- }
-
for (i = 0; i < count; i++) {
- if (is_zero_ip(ip_list[i]))
+ if (is_zero_addr(&ip_list[i].ss))
continue;
- if (name_status_find(domain, 0x1c, 0x20, ip_list[i], srv_name)) {
+ if (name_status_find(domain, 0x1c, 0x20, &ip_list[i].ss, srv_name)) {
result = check_negative_conn_cache( domain, srv_name );
if ( NT_STATUS_IS_OK(result) ) {
- dc_ip = ip_list[i];
+ dc_ss = ip_list[i].ss;
goto done;
}
}
}
-
SAFE_FREE(ip_list);
/* No-one to talk to )-: */
return False; /* Boo-hoo */
-
+
done:
/* We have the netbios name and IP address of a domain controller.
Ideally we should sent a SAMLOGON request to determine whether
the DC is alive and kicking. If we can catch a dead DC before
performing a cli_connect() we can avoid a 30-second timeout. */
+ print_sockaddr(addr, sizeof(addr), &dc_ss);
DEBUG(3, ("rpc_dc_name: Returning DC %s (%s) for domain %s\n", srv_name,
- inet_ntoa(dc_ip), domain));
-
- *ip_out = dc_ip;
+ addr, domain));
+ *ss_out = dc_ss;
SAFE_FREE(ip_list);
return True;
}
+
+/**********************************************************************
+ wrapper around ads and rpc methods of finds DC's
+**********************************************************************/
+
+bool get_dc_name(const char *domain,
+ const char *realm,
+ fstring srv_name,
+ struct sockaddr_storage *ss_out)
+{
+ struct sockaddr_storage dc_ss;
+ bool ret;
+ bool our_domain = False;
+
+ zero_sockaddr(&dc_ss);
+
+ ret = False;
+
+ if ( strequal(lp_workgroup(), domain) || strequal(lp_realm(), realm) )
+ our_domain = True;
+
+ /* always try to obey what the admin specified in smb.conf
+ (for the local domain) */
+
+ if ( (our_domain && lp_security()==SEC_ADS) || realm ) {
+ ret = ads_dc_name(domain, realm, &dc_ss, srv_name);
+ }
+
+ if (!domain) {
+ /* if we have only the realm we can't do anything else */
+ return False;
+ }
+
+ if (!ret) {
+ /* fall back on rpc methods if the ADS methods fail */
+ ret = rpc_dc_name(domain, srv_name, &dc_ss);
+ }
+
+ *ss_out = dc_ss;
+
+ return ret;
+}
git.samba.org / sfrench / samba-autobuild / .git / blobdiff