summaryrefslogtreecommitdiff
path: root/source4/dsdb/samdb/ldb_modules/objectguid.c
blob: 96457447fb261a68e5746757f77b65e882d2b898 (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
/* 
   ldb database library

   Copyright (C) Simo Sorce  2004-2006
   Copyright (C) Andrew Bartlett <abartlet@samba.org> 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 2 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, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*
 *  Name: ldb
 *
 *  Component: ldb objectguid module
 *
 *  Description: add a unique objectGUID onto every new record
 *
 *  Author: Simo Sorce
 */

#include "includes.h"
#include "ldb/include/includes.h"
#include "librpc/gen_ndr/ndr_misc.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_record: add objectGUID attribute */
static int objectguid_add(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_message *msg = req->op.add.message;
	struct ldb_val v;
	struct ldb_message *msg2;
	struct ldb_message_element *attribute;
	struct GUID guid;
	NTSTATUS nt_status;
	int ret, i;

	ldb_debug(module->ldb, LDB_DEBUG_TRACE, "objectguid_add_record\n");

	if (ldb_dn_is_special(msg->dn)) { /* do not manipulate our control entries */
		return ldb_next_request(module, req);
	}

	if ((attribute = objectguid_find_attribute(msg, "objectGUID")) != NULL ) {
		return ldb_next_request(module, req);
	}

	msg2 = talloc(module, struct ldb_message);
	if (!msg2) {
		return -1;
	}

	msg2->dn = msg->dn;
	msg2->num_elements = msg->num_elements;
	msg2->private_data = msg->private_data;
	msg2->elements = talloc_array(msg2, struct ldb_message_element, msg2->num_elements);
	for (i = 0; i < msg2->num_elements; i++) {
		msg2->elements[i] = msg->elements[i];
	}

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

	nt_status = ndr_push_struct_blob(&v, msg2, &guid, 
					 (ndr_push_flags_fn_t)ndr_push_GUID);
	if (!NT_STATUS_IS_OK(nt_status)) {
		return -1;
	}

	ret = ldb_msg_add_value(msg2, "objectGUID", &v);
	if (ret) {
		return ret;
	}

	req->op.add.message = msg2;
	ret = ldb_next_request(module, req);
	req->op.add.message = msg;

	talloc_free(msg2);

	return ret;
}

static int objectguid_add_async(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;
	NTSTATUS nt_status;
	int ret;

	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) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

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

	nt_status = ndr_push_struct_blob(&v, msg, &guid, 
					 (ndr_push_flags_fn_t)ndr_push_GUID);
	if (!NT_STATUS_IS_OK(nt_status)) {
		return -1;
	}

	ret = ldb_msg_add_value(msg, "objectGUID", &v);
	if (ret) {
		return ret;
	}
	
	/* 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->async.handle = down_req->async.handle;
	}

	return ret;
}

static int objectguid_request(struct ldb_module *module, struct ldb_request *req)
{
	switch (req->operation) {

	case LDB_REQ_ADD:
		return objectguid_add(module, req);

	case LDB_ASYNC_ADD:
		return objectguid_add_async(module, req);

	default:
		return ldb_next_request(module, req);

	}
}

static const struct ldb_module_ops objectguid_ops = {
	.name          = "objectguid",
	.request       = objectguid_request
};


int objectguid_module_init(void)
{
	return ldb_register_module(&objectguid_ops);
}