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105 lines
2.7 KiB
C
105 lines
2.7 KiB
C
/*
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Unix SMB/CIFS implementation.
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Winbind daemon connection manager
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Copyright (C) Tim Potter 2001
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Copyright (C) Andrew Bartlett 2002
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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/*
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find the DC for a domain using methods appropriate for a RPC domain
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*/
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BOOL rpc_find_dc(const char *domain, fstring srv_name, struct in_addr *ip_out)
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{
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struct in_addr *ip_list = NULL, dc_ip, exclude_ip;
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int count, i;
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BOOL list_ordered;
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BOOL use_pdc_only;
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zero_ip(&exclude_ip);
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use_pdc_only = must_use_pdc(domain);
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/* Lookup domain controller name */
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if ( use_pdc_only && get_pdc_ip(domain, &dc_ip) ) {
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DEBUG(10,("rpc_find_dc: Atempting to lookup PDC to avoid sam sync delays\n"));
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if (name_status_find(domain, 0x1c, 0x20, dc_ip, srv_name)) {
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goto done;
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}
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/* Didn't get name, remember not to talk to this DC. */
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exclude_ip = dc_ip;
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}
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/* get a list of all domain controllers */
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if (!get_dc_list( domain, &ip_list, &count, &list_ordered) ) {
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DEBUG(3, ("Could not look up dc's for domain %s\n", domain));
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return False;
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}
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/* Remove the entry we've already failed with (should be the PDC). */
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if ( use_pdc_only ) {
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for (i = 0; i < count; i++) {
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if (ip_equal( exclude_ip, ip_list[i]))
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zero_ip(&ip_list[i]);
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}
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}
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/* Pick a nice close server, but only if the list was not ordered */
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if (!list_ordered && (count > 1) ) {
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qsort(ip_list, count, sizeof(struct in_addr), QSORT_CAST ip_compare);
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}
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for (i = 0; i < count; i++) {
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if (is_zero_ip(ip_list[i]))
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continue;
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if (name_status_find(domain, 0x1c, 0x20, ip_list[i], srv_name)) {
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dc_ip = ip_list[i];
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goto done;
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}
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}
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SAFE_FREE(ip_list);
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return False;
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done:
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/* We have the netbios name and IP address of a domain controller.
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Ideally we should sent a SAMLOGON request to determine whether
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the DC is alive and kicking. If we can catch a dead DC before
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performing a cli_connect() we can avoid a 30-second timeout. */
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DEBUG(3, ("rpc_find_dc: Returning DC %s (%s) for domain %s\n", srv_name,
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inet_ntoa(dc_ip), domain));
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*ip_out = dc_ip;
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SAFE_FREE(ip_list);
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return True;
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}
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