merge of get_dc_name()-like code from APP_HEAD; better support password server = DC1 *

(This used to be commit 6b18ca9511ddcf1718f222af3f61491d1e5f3b60)

1 files changed, 104 insertions, 0 deletions

diff --git a/source3/libsmb/namequery_dc.c b/source3/libsmb/namequery_dc.c
new file mode 100644
index 0000000000..ffc64139e9
--- /dev/null
+++ b/source3/libsmb/namequery_dc.c
@@ -0,0 +1,104 @@
+/* 
+   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;
+}
+