source: vendor/current/source4/dsdb/samdb/ldb_modules/pdc_fsmo.c@ 740

/* 
   Unix SMB/CIFS mplementation.

   The module that handles the PDC FSMO Role Owner checkings
   
   Copyright (C) Stefan Metzmacher 2007
    
   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 3 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, see <http://www.gnu.org/licenses/>.
   
*/

#include "includes.h"
#include "ldb_module.h"
#include "dsdb/samdb/samdb.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "librpc/gen_ndr/ndr_drsuapi.h"
#include "librpc/gen_ndr/ndr_drsblobs.h"
#include "../lib/util/dlinklist.h"
#include "dsdb/samdb/ldb_modules/util.h"

static int pdc_fsmo_init(struct ldb_module *module)
{
        struct ldb_context *ldb;
        TALLOC_CTX *mem_ctx;
        struct ldb_dn *pdc_dn;
        struct dsdb_pdc_fsmo *pdc_fsmo;
        struct ldb_result *pdc_res;
        int ret;
        static const char *pdc_attrs[] = {
                "fSMORoleOwner",
                NULL
        };

        ldb = ldb_module_get_ctx(module);

        mem_ctx = talloc_new(module);
        if (!mem_ctx) {
                return ldb_oom(ldb);
        }

        pdc_dn = ldb_get_default_basedn(ldb);
        if (!pdc_dn) {
                ldb_debug_set(ldb, LDB_DEBUG_FATAL,
                          "pdc_fsmo_init: could not determine default basedn");
                talloc_free(mem_ctx);
                return LDB_ERR_OPERATIONS_ERROR;
        }

        pdc_fsmo = talloc_zero(mem_ctx, struct dsdb_pdc_fsmo);
        if (!pdc_fsmo) {
                return ldb_oom(ldb);
        }
        ldb_module_set_private(module, pdc_fsmo);

        ret = dsdb_module_search_dn(module, mem_ctx, &pdc_res,
                                    pdc_dn, 
                                    pdc_attrs,
                                    DSDB_FLAG_NEXT_MODULE, NULL);
        if (ret == LDB_ERR_NO_SUCH_OBJECT) {
                ldb_debug(ldb, LDB_DEBUG_TRACE,
                          "pdc_fsmo_init: no domain object present: (skip loading of domain details)");
                talloc_free(mem_ctx);
                return ldb_next_init(module);
        } else if (ret != LDB_SUCCESS) {
                ldb_debug_set(ldb, LDB_DEBUG_FATAL,
                              "pdc_fsmo_init: failed to search the domain object: %d:%s: %s",
                              ret, ldb_strerror(ret), ldb_errstring(ldb));
                talloc_free(mem_ctx);
                return ret;
        }

        pdc_fsmo->master_dn = ldb_msg_find_attr_as_dn(ldb, mem_ctx, pdc_res->msgs[0], "fSMORoleOwner");
        if (ldb_dn_compare(samdb_ntds_settings_dn(ldb), pdc_fsmo->master_dn) == 0) {
                pdc_fsmo->we_are_master = true;
        } else {
                pdc_fsmo->we_are_master = false;
        }

        if (ldb_set_opaque(ldb, "dsdb_pdc_fsmo", pdc_fsmo) != LDB_SUCCESS) {
                return ldb_oom(ldb);
        }

        talloc_steal(module, pdc_fsmo);

        ldb_debug(ldb, LDB_DEBUG_TRACE,
                          "pdc_fsmo_init: we are master: %s\n",
                          (pdc_fsmo->we_are_master?"yes":"no"));

        talloc_free(mem_ctx);
        return ldb_next_init(module);
}

static const struct ldb_module_ops ldb_pdc_fsmo_module_ops = {
        .name           = "pdc_fsmo",
        .init_context   = pdc_fsmo_init
};

int ldb_pdc_fsmo_module_init(const char *version)
{
        LDB_MODULE_CHECK_VERSION(version);
        return ldb_register_module(&ldb_pdc_fsmo_module_ops);
}