source: vendor/current/source3/smbd/smbXsrv_version.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 7.3 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 Copyright (C) Stefan Metzmacher 2012
5
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3 of the License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
18*/
19
20#include "includes.h"
21#include "system/filesys.h"
22#include "smbd/globals.h"
23#include "dbwrap/dbwrap.h"
24#include "dbwrap/dbwrap_open.h"
25#include "lib/util/util_tdb.h"
26#include "librpc/gen_ndr/ndr_smbXsrv.h"
27#include "serverid.h"
28
29/*
30 * This implements a version scheme for file server internal
31 * states. smbXsrv_version_global.tdb stores the possible
32 * and current versions of structure formats (struct smbXsrv_*_global)
33 * per cluster node.
34 *
35 * If the supported versions doesn't match a version of any
36 * of the other nodes, it refused to start.
37 *
38 * This should prevent silent corruption of the internal
39 * databases and structures, if two incompatible implementations
40 * read and write.
41 *
42 * In future this can be used to implement rolling code upgrades
43 * in a cluster, but for now it is simple.
44 */
45
46static struct db_context *smbXsrv_version_global_db_ctx = NULL;
47static uint32_t smbXsrv_version_global_current_version = UINT32_MAX;
48
49NTSTATUS smbXsrv_version_global_init(const struct server_id *server_id)
50{
51 const char *global_path = NULL;
52 struct db_context *db_ctx = NULL;
53 struct db_record *db_rec = NULL;
54 TDB_DATA key;
55 TDB_DATA val;
56 DATA_BLOB blob;
57 struct smbXsrv_version_globalB global_blob;
58 enum ndr_err_code ndr_err;
59 struct smbXsrv_version_global0 *global = NULL;
60 uint32_t i;
61 uint32_t num_valid = 0;
62 struct smbXsrv_version_node0 *valid = NULL;
63 struct smbXsrv_version_node0 *local_node = NULL;
64 bool exists;
65 NTSTATUS status;
66 const char *key_string = "smbXsrv_version_global";
67 TALLOC_CTX *frame;
68
69 if (smbXsrv_version_global_db_ctx != NULL) {
70 return NT_STATUS_OK;
71 }
72
73 frame = talloc_stackframe();
74
75 global_path = lock_path("smbXsrv_version_global.tdb");
76 if (global_path == NULL) {
77 TALLOC_FREE(frame);
78 return NT_STATUS_NO_MEMORY;
79 }
80
81 db_ctx = db_open(NULL, global_path,
82 0, /* hash_size */
83 TDB_DEFAULT |
84 TDB_CLEAR_IF_FIRST |
85 TDB_INCOMPATIBLE_HASH,
86 O_RDWR | O_CREAT, 0600,
87 DBWRAP_LOCK_ORDER_1,
88 DBWRAP_FLAG_NONE);
89 if (db_ctx == NULL) {
90 status = map_nt_error_from_unix_common(errno);
91 DEBUG(0,("smbXsrv_version_global_init: "
92 "failed to open[%s] - %s\n",
93 global_path, nt_errstr(status)));
94 TALLOC_FREE(frame);
95 return status;
96 }
97
98 key = string_term_tdb_data(key_string);
99
100 db_rec = dbwrap_fetch_locked(db_ctx, db_ctx, key);
101 if (db_rec == NULL) {
102 status = NT_STATUS_INTERNAL_DB_ERROR;
103 DEBUG(0,("smbXsrv_version_global_init: "
104 "dbwrap_fetch_locked(%s) - %s\n",
105 key_string, nt_errstr(status)));
106 TALLOC_FREE(frame);
107 return status;
108 }
109
110 val = dbwrap_record_get_value(db_rec);
111 if (val.dsize == 0) {
112 global = talloc_zero(frame, struct smbXsrv_version_global0);
113 if (global == NULL) {
114 DEBUG(0,("smbXsrv_version_global_init: "
115 "talloc_zero failed - %s\n", __location__));
116 TALLOC_FREE(frame);
117 return NT_STATUS_NO_MEMORY;
118 }
119 ZERO_STRUCT(global_blob);
120 global_blob.version = SMBXSRV_VERSION_CURRENT;
121 global_blob.info.info0 = global;
122 } else {
123 blob = data_blob_const(val.dptr, val.dsize);
124
125 ndr_err = ndr_pull_struct_blob(&blob, frame, &global_blob,
126 (ndr_pull_flags_fn_t)ndr_pull_smbXsrv_version_globalB);
127 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
128 status = ndr_map_error2ntstatus(ndr_err);
129 DEBUG(0,("smbXsrv_version_global_init: "
130 "ndr_pull_smbXsrv_version_globalB - %s\n",
131 nt_errstr(status)));
132 TALLOC_FREE(frame);
133 return status;
134 }
135
136 switch (global_blob.version) {
137 case SMBXSRV_VERSION_0:
138 global = global_blob.info.info0;
139 if (global == NULL) {
140 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
141 break;
142 }
143 status = NT_STATUS_OK;
144 break;
145 default:
146 status = NT_STATUS_REVISION_MISMATCH;
147 break;
148 }
149
150 if (!NT_STATUS_IS_OK(status)) {
151 DEBUG(0,("smbXsrv_version_global_init - %s\n",
152 nt_errstr(status)));
153 NDR_PRINT_DEBUG(smbXsrv_version_globalB, &global_blob);
154 TALLOC_FREE(frame);
155 return status;
156 }
157 }
158
159 valid = talloc_zero_array(global,
160 struct smbXsrv_version_node0,
161 global->num_nodes + 1);
162 if (valid == NULL) {
163 DEBUG(0,("smbXsrv_version_global_init: "
164 "talloc_zero_array failed - %s\n", __location__));
165 TALLOC_FREE(frame);
166 return NT_STATUS_NO_MEMORY;
167 }
168
169 num_valid = 0;
170 for (i=0; i < global->num_nodes; i++) {
171 struct smbXsrv_version_node0 *n = &global->nodes[i];
172
173 exists = serverid_exists(&n->server_id);
174 if (!exists) {
175 continue;
176 }
177
178 if (n->min_version > n->max_version) {
179 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
180 DEBUG(0,("smbXsrv_version_global_init - %s\n",
181 nt_errstr(status)));
182 NDR_PRINT_DEBUG(smbXsrv_version_globalB, &global_blob);
183 TALLOC_FREE(frame);
184 return status;
185 }
186
187 if (n->min_version > global_blob.version) {
188 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
189 DEBUG(0,("smbXsrv_version_global_init - %s\n",
190 nt_errstr(status)));
191 NDR_PRINT_DEBUG(smbXsrv_version_globalB, &global_blob);
192 TALLOC_FREE(frame);
193 return status;
194 }
195
196 if (n->max_version < global_blob.version) {
197 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
198 DEBUG(0,("smbXsrv_version_global_init - %s\n",
199 nt_errstr(status)));
200 NDR_PRINT_DEBUG(smbXsrv_version_globalB, &global_blob);
201 TALLOC_FREE(frame);
202 return status;
203 }
204
205 valid[num_valid] = *n;
206 if (server_id->vnn == n->server_id.vnn) {
207 local_node = &valid[num_valid];
208 }
209 num_valid++;
210 }
211
212 if (local_node == NULL) {
213 local_node = &valid[num_valid];
214 num_valid++;
215 }
216
217 local_node->server_id = *server_id;
218 local_node->min_version = SMBXSRV_VERSION_0;
219 local_node->max_version = SMBXSRV_VERSION_CURRENT;
220 local_node->current_version = global_blob.version;
221
222 global->num_nodes = num_valid;
223 global->nodes = valid;
224
225 global_blob.seqnum += 1;
226 global_blob.info.info0 = global;
227
228 ndr_err = ndr_push_struct_blob(&blob, db_rec, &global_blob,
229 (ndr_push_flags_fn_t)ndr_push_smbXsrv_version_globalB);
230 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
231 status = ndr_map_error2ntstatus(ndr_err);
232 DEBUG(0,("smbXsrv_version_global_init: "
233 "ndr_push_smbXsrv_version_globalB - %s\n",
234 nt_errstr(status)));
235 TALLOC_FREE(frame);
236 return status;
237 }
238
239 val = make_tdb_data(blob.data, blob.length);
240 status = dbwrap_record_store(db_rec, val, TDB_REPLACE);
241 TALLOC_FREE(db_rec);
242 if (!NT_STATUS_IS_OK(status)) {
243 DEBUG(0,("smbXsrv_version_global_init: "
244 "dbwrap_record_store - %s\n",
245 nt_errstr(status)));
246 TALLOC_FREE(frame);
247 return status;
248 }
249
250 DEBUG(10,("smbXsrv_version_global_init\n"));
251 if (DEBUGLVL(10)) {
252 NDR_PRINT_DEBUG(smbXsrv_version_globalB, &global_blob);
253 }
254
255 smbXsrv_version_global_db_ctx = db_ctx;
256 smbXsrv_version_global_current_version = global_blob.version;
257
258 TALLOC_FREE(frame);
259 return NT_STATUS_OK;
260}
261
262uint32_t smbXsrv_version_global_current(void)
263{
264 return smbXsrv_version_global_current_version;
265}
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