source4/dsdb/samdb/ldb_modules/pdc_fsmo.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3
   4    The module that handles the PDC FSMO Role Owner checkings
   5
   6    Copyright (C) Stefan Metzmacher 2007
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 */
  22
  23 #include "includes.h"
  24 #include "ldb_module.h"
  25 #include "dsdb/samdb/samdb.h"
  26 #include "librpc/gen_ndr/ndr_misc.h"
  27 #include "librpc/gen_ndr/ndr_drsuapi.h"
  28 #include "librpc/gen_ndr/ndr_drsblobs.h"
  29 #include "../lib/util/dlinklist.h"
  30 #include "dsdb/samdb/ldb_modules/util.h"
  31
  32 static int pdc_fsmo_init(struct ldb_module *module)
  33 {
  34         struct ldb_context *ldb;
  35         TALLOC_CTX *mem_ctx;
  36         struct ldb_dn *pdc_dn;
  37         struct dsdb_pdc_fsmo *pdc_fsmo;
  38         struct ldb_result *pdc_res;
  39         int ret;
  40         static const char *pdc_attrs[] = {
  41                 "fSMORoleOwner",
  42                 NULL
  43         };
  44
  45         ldb = ldb_module_get_ctx(module);
  46
  47         mem_ctx = talloc_new(module);
  48         if (!mem_ctx) {
  49                 return ldb_oom(ldb);
  50         }
  51
  52         pdc_dn = ldb_get_default_basedn(ldb);
  53         if (!pdc_dn) {
  54                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
  55                           "pdc_fsmo_init: could not determine default basedn");
  56                 talloc_free(mem_ctx);
  57                 return LDB_ERR_OPERATIONS_ERROR;
  58         }
  59
  60         pdc_fsmo = talloc_zero(mem_ctx, struct dsdb_pdc_fsmo);
  61         if (!pdc_fsmo) {
  62                 return ldb_oom(ldb);
  63         }
  64         ldb_module_set_private(module, pdc_fsmo);
  65
  66         ret = dsdb_module_search_dn(module, mem_ctx, &pdc_res,
  67                                     pdc_dn,
  68                                     pdc_attrs,
  69                                     DSDB_FLAG_NEXT_MODULE);
  70         if (ret == LDB_ERR_NO_SUCH_OBJECT) {
  71                 ldb_debug(ldb, LDB_DEBUG_TRACE,
  72                           "pdc_fsmo_init: no domain object present: (skip loading of domain details)");
  73                 talloc_free(mem_ctx);
  74                 return ldb_next_init(module);
  75         } else if (ret != LDB_SUCCESS) {
  76                 ldb_debug_set(ldb, LDB_DEBUG_FATAL,
  77                               "pdc_fsmo_init: failed to search the domain object: %d:%s: %s",
  78                               ret, ldb_strerror(ret), ldb_errstring(ldb));
  79                 talloc_free(mem_ctx);
  80                 return ret;
  81         }
  82
  83         pdc_fsmo->master_dn = ldb_msg_find_attr_as_dn(ldb, mem_ctx, pdc_res->msgs[0], "fSMORoleOwner");
  84         if (ldb_dn_compare(samdb_ntds_settings_dn(ldb), pdc_fsmo->master_dn) == 0) {
  85                 pdc_fsmo->we_are_master = true;
  86         } else {
  87                 pdc_fsmo->we_are_master = false;
  88         }
  89
  90         if (ldb_set_opaque(ldb, "dsdb_pdc_fsmo", pdc_fsmo) != LDB_SUCCESS) {
  91                 return ldb_oom(ldb);
  92         }
  93
  94         talloc_steal(module, pdc_fsmo);
  95
  96         ldb_debug(ldb, LDB_DEBUG_TRACE,
  97                           "pdc_fsmo_init: we are master: %s\n",
  98                           (pdc_fsmo->we_are_master?"yes":"no"));
  99
 100         talloc_free(mem_ctx);
 101         return ldb_next_init(module);
 102 }
 103
 104 static const struct ldb_module_ops ldb_pdc_fsmo_module_ops = {
 105         .name           = "pdc_fsmo",
 106         .init_context   = pdc_fsmo_init
 107 };
 108
 109 int ldb_pdc_fsmo_module_init(const char *version)
 110 {
 111         LDB_MODULE_CHECK_VERSION(version);
 112         return ldb_register_module(&ldb_pdc_fsmo_module_ops);
 113 }