1/* 2 Unix SMB/CIFS implementation. 3 4 Winbind daemon connection manager 5 6 Copyright (C) Tim Potter 2001 7 Copyright (C) Andrew Bartlett 2002 8 Copyright (C) Gerald Carter 2003 9 10 This program is free software; you can redistribute it and/or modify 11 it under the terms of the GNU General Public License as published by 12 the Free Software Foundation; either version 2 of the License, or 13 (at your option) any later version. 14 15 This program is distributed in the hope that it will be useful, 16 but WITHOUT ANY WARRANTY; without even the implied warranty of 17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 GNU General Public License for more details. 19 20 You should have received a copy of the GNU General Public License 21 along with this program; if not, write to the Free Software 22 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 23*/ 24 25 26#include "includes.h" 27 28/************************************************************************** 29 Find the name and IP address for a server in he realm/domain 30 *************************************************************************/ 31 32static BOOL ads_dc_name(const char *domain, const char *realm, struct in_addr *dc_ip, fstring srv_name) 33{ 34 ADS_STRUCT *ads; 35 36 if (!realm && strequal(domain, lp_workgroup())) 37 realm = lp_realm(); 38 39 ads = ads_init(realm, domain, NULL); 40 if (!ads) 41 return False; 42 43 DEBUG(4,("ads_dc_name: domain=%s\n", domain)); 44 45#ifdef HAVE_ADS 46 /* we don't need to bind, just connect */ 47 ads->auth.flags |= ADS_AUTH_NO_BIND; 48 49 ads_connect(ads); 50#endif 51 52 if (!ads->config.realm) { 53 ads_destroy(&ads); 54 return False; 55 } 56 57 fstrcpy(srv_name, ads->config.ldap_server_name); 58 strupper_m(srv_name); 59 *dc_ip = ads->ldap_ip; 60 ads_destroy(&ads); 61 62 DEBUG(4,("ads_dc_name: using server='%s' IP=%s\n", 63 srv_name, inet_ntoa(*dc_ip))); 64 65 return True; 66} 67 68/**************************************************************************** 69 Utility function to return the name of a DC. The name is guaranteed to be 70 valid since we have already done a name_status_find on it 71 ***************************************************************************/ 72 73static BOOL rpc_dc_name(const char *domain, fstring srv_name, struct in_addr *ip_out) 74{ 75 struct ip_service *ip_list = NULL; 76 struct in_addr dc_ip, exclude_ip; 77 int count, i; 78 BOOL use_pdc_only; 79 NTSTATUS result; 80 81 zero_ip(&exclude_ip); 82 83 use_pdc_only = must_use_pdc(domain); 84 85 /* Lookup domain controller name */ 86 87 if ( use_pdc_only && get_pdc_ip(domain, &dc_ip) ) 88 { 89 DEBUG(10,("rpc_dc_name: Atempting to lookup PDC to avoid sam sync delays\n")); 90 91 /* check the connection cache and perform the node status 92 lookup only if the IP is not found to be bad */ 93 94 if (name_status_find(domain, 0x1b, 0x20, dc_ip, srv_name) ) { 95 result = check_negative_conn_cache( domain, srv_name ); 96 if ( NT_STATUS_IS_OK(result) ) 97 goto done; 98 } 99 /* Didn't get name, remember not to talk to this DC. */ 100 exclude_ip = dc_ip; 101 } 102 103 /* get a list of all domain controllers */ 104 105 if ( !get_sorted_dc_list(domain, &ip_list, &count, False) ) { 106 DEBUG(3, ("Could not look up dc's for domain %s\n", domain)); 107 return False; 108 } 109 110 /* Remove the entry we've already failed with (should be the PDC). */ 111 112 if ( use_pdc_only ) { 113 for (i = 0; i < count; i++) { 114 if (ip_equal( exclude_ip, ip_list[i].ip)) 115 zero_ip(&ip_list[i].ip); 116 } 117 } 118 119 for (i = 0; i < count; i++) { 120 if (is_zero_ip(ip_list[i].ip)) 121 continue; 122 123 if (name_status_find(domain, 0x1c, 0x20, ip_list[i].ip, srv_name)) { 124 result = check_negative_conn_cache( domain, srv_name ); 125 if ( NT_STATUS_IS_OK(result) ) { 126 dc_ip = ip_list[i].ip; 127 goto done; 128 } 129 } 130 } 131 132 133 SAFE_FREE(ip_list); 134 135 /* No-one to talk to )-: */ 136 return False; /* Boo-hoo */ 137 138 done: 139 /* We have the netbios name and IP address of a domain controller. 140 Ideally we should sent a SAMLOGON request to determine whether 141 the DC is alive and kicking. If we can catch a dead DC before 142 performing a cli_connect() we can avoid a 30-second timeout. */ 143 144 DEBUG(3, ("rpc_dc_name: Returning DC %s (%s) for domain %s\n", srv_name, 145 inet_ntoa(dc_ip), domain)); 146 147 *ip_out = dc_ip; 148 149 SAFE_FREE(ip_list); 150 151 return True; 152} 153 154/********************************************************************** 155 wrapper around ads and rpc methods of finds DC's 156**********************************************************************/ 157 158BOOL get_dc_name(const char *domain, const char *realm, fstring srv_name, struct in_addr *ip_out) 159{ 160 struct in_addr dc_ip; 161 BOOL ret; 162 BOOL our_domain = False; 163 164 zero_ip(&dc_ip); 165 166 ret = False; 167 168 if ( strequal(lp_workgroup(), domain) || strequal(lp_realm(), realm) ) 169 our_domain = True; 170 171 /* always try to obey what the admin specified in smb.conf 172 (for the local domain) */ 173 174 if ( (our_domain && lp_security()==SEC_ADS) || realm ) { 175 ret = ads_dc_name(domain, realm, &dc_ip, srv_name); 176 } 177 178 if (!ret) { 179 /* fall back on rpc methods if the ADS methods fail */ 180 ret = rpc_dc_name(domain, srv_name, &dc_ip); 181 } 182 183 *ip_out = dc_ip; 184 185 return ret; 186} 187 188