2 Unix SMB/CIFS implementation.
4 Winbind daemon connection manager
6 Copyright (C) Tim Potter 2001
7 Copyright (C) Andrew Bartlett 2002
8 Copyright (C) Gerald Carter 2003
10 This program is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2 of the License, or
13 (at your option) any later version.
15 This program is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with this program; if not, write to the Free Software
22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
28 /**************************************************************************
29 Find the name and IP address for a server in the realm/domain
30 *************************************************************************/
32 static BOOL ads_dc_name(const char *domain,
34 struct in_addr *dc_ip,
38 char *sitename = sitename_fetch();
41 if (!realm && strequal(domain, lp_workgroup())) {
45 /* Try this 3 times then give up. */
46 for( i =0 ; i < 3; i++) {
47 ads = ads_init(realm, domain, NULL);
53 DEBUG(4,("ads_dc_name: domain=%s\n", domain));
56 /* we don't need to bind, just connect */
57 ads->auth.flags |= ADS_AUTH_NO_BIND;
61 if (!ads->config.realm) {
67 /* Now we've found a server, see if our sitename
68 has changed. If so, we need to re-do the DNS query
69 to ensure we only find servers in our site. */
71 if (sitename_changed(sitename)) {
73 sitename = sitename_fetch();
79 if ((ads->config.flags & ADS_KDC) && sitename) {
80 /* We're going to use this KDC for this realm/domain.
81 If we are using sites, then force the krb5 libs
84 create_local_private_krb5_conf_for_domain(realm,
93 DEBUG(1,("ads_dc_name: sitename (now \"%s\") keeps changing ???\n",
94 sitename ? sitename : ""));
101 fstrcpy(srv_name, ads->config.ldap_server_name);
102 strupper_m(srv_name);
103 *dc_ip = ads->ldap_ip;
106 DEBUG(4,("ads_dc_name: using server='%s' IP=%s\n",
107 srv_name, inet_ntoa(*dc_ip)));
112 /****************************************************************************
113 Utility function to return the name of a DC. The name is guaranteed to be
114 valid since we have already done a name_status_find on it
115 ***************************************************************************/
117 static BOOL rpc_dc_name(const char *domain, fstring srv_name, struct in_addr *ip_out)
119 struct ip_service *ip_list = NULL;
120 struct in_addr dc_ip, exclude_ip;
124 zero_ip(&exclude_ip);
126 /* get a list of all domain controllers */
128 if (!NT_STATUS_IS_OK(get_sorted_dc_list(domain, &ip_list, &count,
130 DEBUG(3, ("Could not look up dc's for domain %s\n", domain));
134 /* Remove the entry we've already failed with (should be the PDC). */
136 for (i = 0; i < count; i++) {
137 if (is_zero_ip(ip_list[i].ip))
140 if (name_status_find(domain, 0x1c, 0x20, ip_list[i].ip, srv_name)) {
141 result = check_negative_conn_cache( domain, srv_name );
142 if ( NT_STATUS_IS_OK(result) ) {
143 dc_ip = ip_list[i].ip;
152 /* No-one to talk to )-: */
153 return False; /* Boo-hoo */
156 /* We have the netbios name and IP address of a domain controller.
157 Ideally we should sent a SAMLOGON request to determine whether
158 the DC is alive and kicking. If we can catch a dead DC before
159 performing a cli_connect() we can avoid a 30-second timeout. */
161 DEBUG(3, ("rpc_dc_name: Returning DC %s (%s) for domain %s\n", srv_name,
162 inet_ntoa(dc_ip), domain));
171 /**********************************************************************
172 wrapper around ads and rpc methods of finds DC's
173 **********************************************************************/
175 BOOL get_dc_name(const char *domain, const char *realm, fstring srv_name, struct in_addr *ip_out)
177 struct in_addr dc_ip;
179 BOOL our_domain = False;
185 if ( strequal(lp_workgroup(), domain) || strequal(lp_realm(), realm) )
188 /* always try to obey what the admin specified in smb.conf
189 (for the local domain) */
191 if ( (our_domain && lp_security()==SEC_ADS) || realm ) {
192 ret = ads_dc_name(domain, realm, &dc_ip, srv_name);
196 /* fall back on rpc methods if the ADS methods fail */
197 ret = rpc_dc_name(domain, srv_name, &dc_ip);