Fix missing ads_destroy in error path.
[Samba/bb.git] / source3 / libsmb / namequery_dc.c
blobf4c2fc1929bdec7cc72a43ee679e168632575ebd
1 /*
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 3 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, see <http://www.gnu.org/licenses/>.
25 #include "includes.h"
26 #include "libads/sitename_cache.h"
27 #include "ads.h"
28 #include "../librpc/gen_ndr/nbt.h"
29 #include "lib/param/loadparm.h"
31 /**********************************************************************
32 Is this our primary domain ?
33 **********************************************************************/
35 #ifdef HAVE_KRB5
36 static bool is_our_primary_domain(const char *domain)
38 int role = lp_server_role();
40 if ((role == ROLE_DOMAIN_MEMBER) && strequal(lp_workgroup(), domain)) {
41 return True;
42 } else if (strequal(get_global_sam_name(), domain)) {
43 return True;
45 return False;
47 #endif
49 /**************************************************************************
50 Find the name and IP address for a server in the realm/domain
51 *************************************************************************/
53 static bool ads_dc_name(const char *domain,
54 const char *realm,
55 struct sockaddr_storage *dc_ss,
56 fstring srv_name)
58 ADS_STRUCT *ads;
59 char *sitename;
60 int i;
61 char addr[INET6_ADDRSTRLEN];
63 if (!realm && strequal(domain, lp_workgroup())) {
64 realm = lp_realm();
67 sitename = sitename_fetch(realm);
69 /* Try this 3 times then give up. */
70 for( i =0 ; i < 3; i++) {
71 ads = ads_init(realm, domain, NULL);
72 if (!ads) {
73 SAFE_FREE(sitename);
74 return False;
77 DEBUG(4,("ads_dc_name: domain=%s\n", domain));
79 #ifdef HAVE_ADS
80 /* we don't need to bind, just connect */
81 ads->auth.flags |= ADS_AUTH_NO_BIND;
82 ads_connect(ads);
83 #endif
85 if (!ads->config.realm) {
86 SAFE_FREE(sitename);
87 ads_destroy(&ads);
88 return False;
91 /* Now we've found a server, see if our sitename
92 has changed. If so, we need to re-do the DNS query
93 to ensure we only find servers in our site. */
95 if (stored_sitename_changed(realm, sitename)) {
96 SAFE_FREE(sitename);
97 sitename = sitename_fetch(realm);
98 ads_destroy(&ads);
99 /* Ensure we don't cache the DC we just connected to. */
100 namecache_delete(realm, 0x1C);
101 namecache_delete(domain, 0x1C);
102 continue;
105 #ifdef HAVE_ADS
106 if (is_our_primary_domain(domain) && (ads->config.flags & NBT_SERVER_KDC)) {
107 if (ads_closest_dc(ads)) {
108 /* We're going to use this KDC for this realm/domain.
109 If we are using sites, then force the krb5 libs
110 to use this KDC. */
112 create_local_private_krb5_conf_for_domain(realm,
113 domain,
114 sitename,
115 &ads->ldap.ss,
116 ads->config.ldap_server_name);
117 } else {
118 create_local_private_krb5_conf_for_domain(realm,
119 domain,
120 NULL,
121 &ads->ldap.ss,
122 ads->config.ldap_server_name);
125 #endif
126 break;
129 if (i == 3) {
130 DEBUG(1,("ads_dc_name: sitename (now \"%s\") keeps changing ???\n",
131 sitename ? sitename : ""));
132 SAFE_FREE(sitename);
133 ads_destroy(&ads);
134 return False;
137 SAFE_FREE(sitename);
139 fstrcpy(srv_name, ads->config.ldap_server_name);
140 strupper_m(srv_name);
141 #ifdef HAVE_ADS
142 *dc_ss = ads->ldap.ss;
143 #else
144 zero_sockaddr(dc_ss);
145 #endif
146 ads_destroy(&ads);
148 print_sockaddr(addr, sizeof(addr), dc_ss);
149 DEBUG(4,("ads_dc_name: using server='%s' IP=%s\n",
150 srv_name, addr));
152 return True;
155 /****************************************************************************
156 Utility function to return the name of a DC. The name is guaranteed to be
157 valid since we have already done a name_status_find on it
158 ***************************************************************************/
160 static bool rpc_dc_name(const char *domain,
161 fstring srv_name,
162 struct sockaddr_storage *ss_out)
164 struct ip_service *ip_list = NULL;
165 struct sockaddr_storage dc_ss;
166 int count, i;
167 NTSTATUS result;
168 char addr[INET6_ADDRSTRLEN];
170 /* get a list of all domain controllers */
172 if (!NT_STATUS_IS_OK(get_sorted_dc_list(domain, NULL, &ip_list, &count,
173 False))) {
174 DEBUG(3, ("Could not look up dc's for domain %s\n", domain));
175 return False;
178 /* Remove the entry we've already failed with (should be the PDC). */
180 for (i = 0; i < count; i++) {
181 if (is_zero_addr(&ip_list[i].ss))
182 continue;
184 if (name_status_find(domain, 0x1c, 0x20, &ip_list[i].ss, srv_name)) {
185 result = check_negative_conn_cache( domain, srv_name );
186 if ( NT_STATUS_IS_OK(result) ) {
187 dc_ss = ip_list[i].ss;
188 goto done;
193 SAFE_FREE(ip_list);
195 /* No-one to talk to )-: */
196 return False; /* Boo-hoo */
198 done:
199 /* We have the netbios name and IP address of a domain controller.
200 Ideally we should sent a SAMLOGON request to determine whether
201 the DC is alive and kicking. If we can catch a dead DC before
202 performing a cli_connect() we can avoid a 30-second timeout. */
204 print_sockaddr(addr, sizeof(addr), &dc_ss);
205 DEBUG(3, ("rpc_dc_name: Returning DC %s (%s) for domain %s\n", srv_name,
206 addr, domain));
208 *ss_out = dc_ss;
209 SAFE_FREE(ip_list);
211 return True;
214 /**********************************************************************
215 wrapper around ads and rpc methods of finds DC's
216 **********************************************************************/
218 bool get_dc_name(const char *domain,
219 const char *realm,
220 fstring srv_name,
221 struct sockaddr_storage *ss_out)
223 struct sockaddr_storage dc_ss;
224 bool ret;
225 bool our_domain = False;
227 zero_sockaddr(&dc_ss);
229 ret = False;
231 if ( strequal(lp_workgroup(), domain) || strequal(lp_realm(), realm) )
232 our_domain = True;
234 /* always try to obey what the admin specified in smb.conf
235 (for the local domain) */
237 if ( (our_domain && lp_security()==SEC_ADS) || realm ) {
238 ret = ads_dc_name(domain, realm, &dc_ss, srv_name);
241 if (!domain) {
242 /* if we have only the realm we can't do anything else */
243 return False;
246 if (!ret) {
247 /* fall back on rpc methods if the ADS methods fail */
248 ret = rpc_dc_name(domain, srv_name, &dc_ss);
251 *ss_out = dc_ss;
253 return ret;