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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 smbcli_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;
}
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