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-rw-r--r--source4/libcli/namequery_dc.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/source4/libcli/namequery_dc.c b/source4/libcli/namequery_dc.c
new file mode 100644
index 0000000000..ffc64139e9
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+++ b/source4/libcli/namequery_dc.c
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+/*
+ Unix SMB/CIFS implementation.
+
+ Winbind daemon connection manager
+
+ Copyright (C) Tim Potter 2001
+ Copyright (C) Andrew Bartlett 2002
+
+ 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
+ (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.
+*/
+
+
+#include "includes.h"
+
+
+/*
+ find the DC for a domain using methods appropriate for a RPC domain
+*/
+BOOL rpc_find_dc(const char *domain, fstring srv_name, struct in_addr *ip_out)
+{
+ struct in_addr *ip_list = NULL, dc_ip, exclude_ip;
+ int count, i;
+ BOOL list_ordered;
+ BOOL use_pdc_only;
+
+ 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_find_dc: Atempting to lookup PDC to avoid sam sync delays\n"));
+
+ if (name_status_find(domain, 0x1c, 0x20, dc_ip, srv_name)) {
+ goto done;
+ }
+ /* Didn't get name, remember not to talk to this DC. */
+ exclude_ip = dc_ip;
+ }
+
+ /* get a list of all domain controllers */
+
+ if (!get_dc_list( domain, &ip_list, &count, &list_ordered) ) {
+ 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]))
+ continue;
+
+ if (name_status_find(domain, 0x1c, 0x20, ip_list[i], srv_name)) {
+ dc_ip = ip_list[i];
+ goto done;
+ }
+ }
+
+
+ SAFE_FREE(ip_list);
+
+ return False;
+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. */
+
+ DEBUG(3, ("rpc_find_dc: Returning DC %s (%s) for domain %s\n", srv_name,
+ inet_ntoa(dc_ip), domain));
+
+ *ip_out = dc_ip;
+
+ SAFE_FREE(ip_list);
+
+ return True;
+}
+