diff options
Diffstat (limited to 'source4/dsdb/samdb/ldb_modules/objectguid.c')
| -rw-r--r-- | source4/dsdb/samdb/ldb_modules/objectguid.c | 252 |
1 files changed, 252 insertions, 0 deletions
diff --git a/source4/dsdb/samdb/ldb_modules/objectguid.c b/source4/dsdb/samdb/ldb_modules/objectguid.c new file mode 100644 index 0000000..cfc8918 --- /dev/null +++ b/source4/dsdb/samdb/ldb_modules/objectguid.c @@ -0,0 +1,252 @@ +/* + ldb database library + + Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005 + Copyright (C) Andrew Tridgell 2005 + Copyright (C) Simo Sorce 2004-2008 + + 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/>. +*/ + +/* + * Name: ldb + * + * Component: ldb objectguid module + * + * Description: add a unique objectGUID onto every new record + * + * Author: Simo Sorce + */ + +#include "includes.h" +#include "ldb_module.h" +#include "dsdb/samdb/samdb.h" +#include "dsdb/samdb/ldb_modules/util.h" +#include "librpc/gen_ndr/ndr_misc.h" +#include "param/param.h" + +/* + add a time element to a record +*/ +static int add_time_element(struct ldb_message *msg, const char *attr, time_t t) +{ + char *s; + int ret; + + if (ldb_msg_find_element(msg, attr) != NULL) { + return LDB_SUCCESS; + } + + s = ldb_timestring(msg, t); + if (s == NULL) { + return LDB_ERR_OPERATIONS_ERROR; + } + + /* always set as replace. This works because on add ops, the flag + is ignored */ + ret = ldb_msg_append_string(msg, attr, s, LDB_FLAG_MOD_REPLACE); + if (ret != LDB_SUCCESS) { + return ret; + } + + return LDB_SUCCESS; +} + +/* + add a uint64_t element to a record +*/ +static int add_uint64_element(struct ldb_context *ldb, struct ldb_message *msg, + const char *attr, uint64_t v) +{ + int ret; + + if (ldb_msg_find_element(msg, attr) != NULL) { + return LDB_SUCCESS; + } + + /* always set as replace. This works because on add ops, the flag + is ignored */ + ret = samdb_msg_append_uint64(ldb, msg, msg, attr, v, LDB_FLAG_MOD_REPLACE); + if (ret != LDB_SUCCESS) { + return ret; + } + + return LDB_SUCCESS; +} + +struct og_context { + struct ldb_module *module; + struct ldb_request *req; +}; + +/* add_record: add objectGUID and timestamp attributes */ +static int objectguid_add(struct ldb_module *module, struct ldb_request *req) +{ + struct ldb_context *ldb; + struct ldb_request *down_req; + struct ldb_message *msg; + struct ldb_message_element *el; + struct GUID guid; + uint64_t seq_num; + int ret; + time_t t = time(NULL); + struct og_context *ac; + + ldb = ldb_module_get_ctx(module); + + ldb_debug(ldb, LDB_DEBUG_TRACE, "objectguid_add_record\n"); + + /* do not manipulate our control entries */ + if (ldb_dn_is_special(req->op.add.message->dn)) { + return ldb_next_request(module, req); + } + + el = ldb_msg_find_element(req->op.add.message, "objectGUID"); + if (el != NULL) { + ldb_set_errstring(ldb, + "objectguid: objectGUID must not be specified!"); + return LDB_ERR_UNWILLING_TO_PERFORM; + } + + ac = talloc(req, struct og_context); + if (ac == NULL) { + return ldb_oom(ldb); + } + ac->module = module; + ac->req = req; + + /* we have to copy the message as the caller might have it as a const */ + msg = ldb_msg_copy_shallow(ac, req->op.add.message); + if (msg == NULL) { + talloc_free(ac); + return ldb_operr(ldb); + } + + /* a new GUID */ + guid = GUID_random(); + + ret = dsdb_msg_add_guid(msg, &guid, "objectGUID"); + if (ret != LDB_SUCCESS) { + return ret; + } + + if (add_time_element(msg, "whenCreated", t) != LDB_SUCCESS || + add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) { + return ldb_operr(ldb); + } + + /* Get a sequence number from the backend */ + ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num); + if (ret == LDB_SUCCESS) { + if (add_uint64_element(ldb, msg, "uSNCreated", + seq_num) != LDB_SUCCESS || + add_uint64_element(ldb, msg, "uSNChanged", + seq_num) != LDB_SUCCESS) { + return ldb_operr(ldb); + } + } + + ret = ldb_build_add_req(&down_req, ldb, ac, + msg, + req->controls, + req, dsdb_next_callback, + req); + LDB_REQ_SET_LOCATION(down_req); + if (ret != LDB_SUCCESS) { + return ret; + } + + /* go on with the call chain */ + return ldb_next_request(module, down_req); +} + +/* modify_record: update timestamps */ +static int objectguid_modify(struct ldb_module *module, struct ldb_request *req) +{ + struct ldb_context *ldb; + struct ldb_request *down_req; + struct ldb_message *msg; + struct ldb_message_element *el; + int ret; + time_t t = time(NULL); + uint64_t seq_num; + struct og_context *ac; + + ldb = ldb_module_get_ctx(module); + + ldb_debug(ldb, LDB_DEBUG_TRACE, "objectguid_modify_record\n"); + + /* do not manipulate our control entries */ + if (ldb_dn_is_special(req->op.mod.message->dn)) { + return ldb_next_request(module, req); + } + + el = ldb_msg_find_element(req->op.mod.message, "objectGUID"); + if (el != NULL) { + ldb_set_errstring(ldb, + "objectguid: objectGUID must not be specified!"); + return LDB_ERR_CONSTRAINT_VIOLATION; + } + + ac = talloc(req, struct og_context); + if (ac == NULL) { + return ldb_oom(ldb); + } + ac->module = module; + ac->req = req; + + /* we have to copy the message as the caller might have it as a const */ + msg = ldb_msg_copy_shallow(ac, req->op.mod.message); + if (msg == NULL) { + return ldb_operr(ldb); + } + + if (add_time_element(msg, "whenChanged", t) != LDB_SUCCESS) { + return ldb_operr(ldb); + } + + /* Get a sequence number from the backend */ + ret = ldb_sequence_number(ldb, LDB_SEQ_NEXT, &seq_num); + if (ret == LDB_SUCCESS) { + if (add_uint64_element(ldb, msg, "uSNChanged", + seq_num) != LDB_SUCCESS) { + return ldb_operr(ldb); + } + } + + ret = ldb_build_mod_req(&down_req, ldb, ac, + msg, + req->controls, + req, dsdb_next_callback, + req); + LDB_REQ_SET_LOCATION(down_req); + if (ret != LDB_SUCCESS) { + return ret; + } + + /* go on with the call chain */ + return ldb_next_request(module, down_req); +} + +static const struct ldb_module_ops ldb_objectguid_module_ops = { + .name = "objectguid", + .add = objectguid_add, + .modify = objectguid_modify +}; + +int ldb_objectguid_module_init(const char *version) +{ + LDB_MODULE_CHECK_VERSION(version); + return ldb_register_module(&ldb_objectguid_module_ops); +} |