diff options
Diffstat (limited to 'source4/libcli/namequery_dc.c')
-rw-r--r-- | source4/libcli/namequery_dc.c | 104 |
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 --- /dev/null +++ b/source4/libcli/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; +} + |