summaryrefslogtreecommitdiff
path: root/source4/dsdb/samdb/ldb_modules/objectguid.c
blob: f62839389d2c6b70274da08e281dfb3af9ada880 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
/* 
   ldb database library

   Copyright (C) Simo Sorce  2004-2006
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   Copyright (C) Andrew Tridgell 2005

     ** NOTE! The following LGPL license applies to the ldb
     ** library. This does NOT imply that all of Samba is released
     ** under the LGPL
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This library 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
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; 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/include/ldb_includes.h"
#include "librpc/gen_ndr/ndr_misc.h"
#include "param/param.h"

static struct ldb_message_element *objectguid_find_attribute(const struct ldb_message *msg, const char *name)
{
	int i;

	for (i = 0; i < msg->num_elements; i++) {
		if (ldb_attr_cmp(name, msg->elements[i].name) == 0) {
			return &msg->elements[i];
		}
	}

	return NULL;
}

/*
  add a time element to a record
*/
static int add_time_element(struct ldb_message *msg, const char *attr, time_t t)
{
	struct ldb_message_element *el;
	char *s;

	if (ldb_msg_find_element(msg, attr) != NULL) {
		return 0;
	}

	s = ldb_timestring(msg, t);
	if (s == NULL) {
		return -1;
	}

	if (ldb_msg_add_string(msg, attr, s) != 0) {
		return -1;
	}

	el = ldb_msg_find_element(msg, attr);
	/* always set as replace. This works because on add ops, the flag
	   is ignored */
	el->flags = LDB_FLAG_MOD_REPLACE;

	return 0;
}

/*
  add a uint64_t element to a record
*/
static int add_uint64_element(struct ldb_message *msg, const char *attr, uint64_t v)
{
	struct ldb_message_element *el;

	if (ldb_msg_find_element(msg, attr) != NULL) {
		return 0;
	}

	if (ldb_msg_add_fmt(msg, attr, "%llu", (unsigned long long)v) != 0) {
		return -1;
	}

	el = ldb_msg_find_element(msg, attr);
	/* always set as replace. This works because on add ops, the flag
	   is ignored */
	el->flags = LDB_FLAG_MOD_REPLACE;

	return 0;
}

/* add_record: add objectGUID attribute */
static int objectguid_add(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_request *down_req;
	struct ldb_message_element *attribute;
	struct ldb_message *msg;
	struct ldb_val v;
	struct GUID guid;
	uint64_t seq_num;
	enum ndr_err_code ndr_err;
	int ret;
	time_t t = time(NULL);

	ldb_debug(module->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);
	}

	if ((attribute = objectguid_find_attribute(req->op.add.message, "objectGUID")) != NULL ) {
		return ldb_next_request(module, req);
	}

	down_req = talloc(req, struct ldb_request);
	if (down_req == NULL) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	*down_req = *req;

	/* we have to copy the message as the caller might have it as a const */
	down_req->op.add.message = msg = ldb_msg_copy_shallow(down_req, req->op.add.message);
	if (msg == NULL) {
		talloc_free(down_req);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/* a new GUID */
	guid = GUID_random();

	ndr_err = ndr_push_struct_blob(&v, msg, 
				       lp_iconv_convenience(ldb_get_opaque(module->ldb, "loadparm")),
				       &guid,
				       (ndr_push_flags_fn_t)ndr_push_GUID);
	if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
		talloc_free(down_req);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ret = ldb_msg_add_value(msg, "objectGUID", &v, NULL);
	if (ret) {
		talloc_free(down_req);
		return ret;
	}
	
	if (add_time_element(msg, "whenCreated", t) != 0 ||
	    add_time_element(msg, "whenChanged", t) != 0) {
		talloc_free(down_req);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/* Get a sequence number from the backend */
	ret = ldb_sequence_number(module->ldb, LDB_SEQ_NEXT, &seq_num);
	if (ret == LDB_SUCCESS) {
		if (add_uint64_element(msg, "uSNCreated", seq_num) != 0 ||
		    add_uint64_element(msg, "uSNChanged", seq_num) != 0) {
			talloc_free(down_req);
			return LDB_ERR_OPERATIONS_ERROR;
		}
	}

	ldb_set_timeout_from_prev_req(module->ldb, req, down_req);

	/* go on with the call chain */
	ret = ldb_next_request(module, down_req);

	/* do not free down_req as the call results may be linked to it,
	 * it will be freed when the upper level request get freed */
	if (ret == LDB_SUCCESS) {
		req->handle = down_req->handle;
	}

	return ret;
}

/* modify_record: update timestamps */
static int objectguid_modify(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_request *down_req;
	struct ldb_message *msg;
	int ret;
	time_t t = time(NULL);
	uint64_t seq_num;

	ldb_debug(module->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);
	}

	down_req = talloc(req, struct ldb_request);
	if (down_req == NULL) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	*down_req = *req;

	/* we have to copy the message as the caller might have it as a const */
	down_req->op.mod.message = msg = ldb_msg_copy_shallow(down_req, req->op.mod.message);
	if (msg == NULL) {
		talloc_free(down_req);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	if (add_time_element(msg, "whenChanged", t) != 0) {
		talloc_free(down_req);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	/* Get a sequence number from the backend */
	ret = ldb_sequence_number(module->ldb, LDB_SEQ_NEXT, &seq_num);
	if (ret == LDB_SUCCESS) {
		if (add_uint64_element(msg, "uSNChanged", seq_num) != 0) {
			talloc_free(down_req);
			return LDB_ERR_OPERATIONS_ERROR;
		}
	}

	ldb_set_timeout_from_prev_req(module->ldb, req, down_req);

	/* go on with the call chain */
	ret = ldb_next_request(module, down_req);

	/* do not free down_req as the call results may be linked to it,
	 * it will be freed when the upper level request get freed */
	if (ret == LDB_SUCCESS) {
		req->handle = down_req->handle;
	}

	return ret;
}

_PUBLIC_ const struct ldb_module_ops ldb_objectguid_module_ops = {
	.name          = "objectguid",
	.add           = objectguid_add,
	.modify        = objectguid_modify,
};