2 Unix SMB/CIFS implementation.
3 Database interface using a file per record
4 Copyright (C) Volker Lendecke 2005
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.
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.
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/>.
21 #include "dbwrap/dbwrap.h"
22 #include "dbwrap/dbwrap_file.h"
23 #include "dbwrap/dbwrap_private.h"
24 #include "lib/util/tdb_wrap.h"
29 /* We only support one locked record at a time -- everything else
30 * would lead to a potential deadlock anyway! */
31 struct db_record *locked_record;
34 struct db_locked_file {
39 struct db_file_ctx *parent;
42 /* Copy from statcache.c... */
44 static uint32 fsh(const uint8 *p, int len)
48 for (i=0; i<len; i++) {
49 n = ((n << 5) + n) ^ (uint32)(p[i]);
54 static int db_locked_file_destr(struct db_locked_file *data)
56 if (data->parent != NULL) {
57 data->parent->locked_record = NULL;
60 if (close(data->fd) != 0) {
61 DEBUG(3, ("close failed: %s\n", strerror(errno)));
68 static NTSTATUS db_file_store(struct db_record *rec, TDB_DATA data, int flag);
69 static NTSTATUS db_file_delete(struct db_record *rec);
71 static struct db_record *db_file_fetch_locked(struct db_context *db,
75 struct db_file_ctx *ctx = talloc_get_type_abort(db->private_data,
77 struct db_record *result;
78 struct db_locked_file *file;
80 SMB_STRUCT_STAT statbuf;
83 SMB_ASSERT(ctx->locked_record == NULL);
86 if (!(result = talloc(mem_ctx, struct db_record))) {
87 DEBUG(0, ("talloc failed\n"));
91 if (!(file = talloc(result, struct db_locked_file))) {
92 DEBUG(0, ("talloc failed\n"));
97 result->private_data = file;
98 result->store = db_file_store;
99 result->delete_rec = db_file_delete;
101 result->key.dsize = key.dsize;
102 result->key.dptr = (uint8 *)talloc_memdup(result, key.dptr, key.dsize);
103 if (result->key.dptr == NULL) {
104 DEBUG(0, ("talloc failed\n"));
110 file->hash = fsh(key.dptr, key.dsize);
111 file->name = hex_encode_talloc(file, (unsigned char *)key.dptr, key.dsize);
112 if (file->name == NULL) {
113 DEBUG(0, ("hex_encode failed\n"));
118 file->path = talloc_asprintf(file, "%s/%2.2X/%s", ctx->dirname,
119 file->hash, file->name);
120 if (file->path == NULL) {
121 DEBUG(0, ("talloc_asprintf failed\n"));
127 file->fd = open(file->path, O_RDWR|O_CREAT, 0644);
131 DEBUG(3, ("Could not open/create %s: %s\n",
132 file->path, strerror(errno)));
137 talloc_set_destructor(file, db_locked_file_destr);
140 fl.l_whence = SEEK_SET;
146 ret = fcntl(file->fd, F_SETLKW, &fl);
147 } while ((ret == -1) && (errno == EINTR));
150 DEBUG(3, ("Could not get lock on %s: %s\n",
151 file->path, strerror(errno)));
156 if (sys_fstat(file->fd, &statbuf, false) != 0) {
157 DEBUG(3, ("Could not fstat %s: %s\n",
158 file->path, strerror(errno)));
163 if (statbuf.st_ex_nlink == 0) {
164 /* Someone has deleted it under the lock, retry */
169 result->value.dsize = 0;
170 result->value.dptr = NULL;
172 if (statbuf.st_ex_size != 0) {
175 result->value.dsize = statbuf.st_ex_size;
176 result->value.dptr = talloc_array(result, uint8,
178 if (result->value.dptr == NULL) {
179 DEBUG(1, ("talloc failed\n"));
184 status = read_data(file->fd, (char *)result->value.dptr,
185 result->value.dsize);
186 if (!NT_STATUS_IS_OK(status)) {
187 DEBUG(3, ("read_data failed: %s\n",
194 ctx->locked_record = result;
195 file->parent = (struct db_file_ctx *)talloc_reference(file, ctx);
200 static NTSTATUS db_file_store_root(int fd, TDB_DATA data)
202 if (lseek(fd, 0, SEEK_SET) != 0) {
203 DEBUG(0, ("lseek failed: %s\n", strerror(errno)));
204 return map_nt_error_from_unix(errno);
207 if (write_data(fd, (char *)data.dptr, data.dsize) != data.dsize) {
208 DEBUG(3, ("write_data failed: %s\n", strerror(errno)));
209 return map_nt_error_from_unix(errno);
212 if (ftruncate(fd, data.dsize) != 0) {
213 DEBUG(3, ("ftruncate failed: %s\n", strerror(errno)));
214 return map_nt_error_from_unix(errno);
220 static NTSTATUS db_file_store(struct db_record *rec, TDB_DATA data, int flag)
222 struct db_locked_file *file =
223 talloc_get_type_abort(rec->private_data,
224 struct db_locked_file);
228 status = db_file_store_root(file->fd, data);
234 static NTSTATUS db_file_delete(struct db_record *rec)
236 struct db_locked_file *file =
237 talloc_get_type_abort(rec->private_data,
238 struct db_locked_file);
242 res = unlink(file->path);
246 DEBUG(3, ("unlink(%s) failed: %s\n", file->path,
248 return map_nt_error_from_unix(errno);
254 static int db_file_traverse(struct db_context *db,
255 int (*fn)(struct db_record *rec,
259 struct db_file_ctx *ctx = talloc_get_type_abort(db->private_data,
261 TALLOC_CTX *mem_ctx = talloc_init("traversal %s\n", ctx->dirname);
266 for (i=0; i<256; i++) {
267 const char *dirname = talloc_asprintf(mem_ctx, "%s/%2.2X",
270 struct dirent *dirent;
272 if (dirname == NULL) {
273 DEBUG(0, ("talloc failed\n"));
274 TALLOC_FREE(mem_ctx);
278 dir = opendir(dirname);
280 DEBUG(3, ("Could not open dir %s: %s\n", dirname,
282 TALLOC_FREE(mem_ctx);
286 while ((dirent = readdir(dir)) != NULL) {
289 struct db_record *rec;
291 if ((dirent->d_name[0] == '.') &&
292 ((dirent->d_name[1] == '\0') ||
293 ((dirent->d_name[1] == '.') &&
294 (dirent->d_name[2] == '\0')))) {
298 keyblob = strhex_to_data_blob(mem_ctx, dirent->d_name);
299 if (keyblob.data == NULL) {
300 DEBUG(5, ("strhex_to_data_blob failed\n"));
304 key.dptr = keyblob.data;
305 key.dsize = keyblob.length;
307 if ((ctx->locked_record != NULL) &&
308 (key.dsize == ctx->locked_record->key.dsize) &&
309 (memcmp(key.dptr, ctx->locked_record->key.dptr,
312 if (fn(ctx->locked_record,
313 private_data) != 0) {
314 TALLOC_FREE(mem_ctx);
320 rec = db_file_fetch_locked(db, mem_ctx, key);
322 /* Someone might have deleted it */
326 if (rec->value.dptr == NULL) {
333 if (fn(rec, private_data) != 0) {
334 TALLOC_FREE(mem_ctx);
344 TALLOC_FREE(mem_ctx);
348 struct db_context *db_open_file(TALLOC_CTX *mem_ctx,
349 struct messaging_context *msg_ctx,
351 int hash_size, int tdb_flags,
352 int open_flags, mode_t mode)
354 struct db_context *result = NULL;
355 struct db_file_ctx *ctx;
357 if (!(result = talloc_zero(mem_ctx, struct db_context))) {
358 DEBUG(0, ("talloc failed\n"));
362 if (!(ctx = talloc(result, struct db_file_ctx))) {
363 DEBUG(0, ("talloc failed\n"));
368 result->private_data = ctx;
369 result->fetch_locked = db_file_fetch_locked;
370 result->traverse = db_file_traverse;
371 result->traverse_read = db_file_traverse;
372 result->persistent = ((tdb_flags & TDB_CLEAR_IF_FIRST) == 0);
374 ctx->locked_record = NULL;
375 if (!(ctx->dirname = talloc_strdup(ctx, name))) {
376 DEBUG(0, ("talloc failed\n"));
381 if (open_flags & O_CREAT) {
384 mode |= (mode & S_IRUSR) ? S_IXUSR : 0;
385 mode |= (mode & S_IRGRP) ? S_IXGRP : 0;
386 mode |= (mode & S_IROTH) ? S_IXOTH : 0;
388 ret = mkdir(name, mode);
389 if ((ret != 0) && (errno != EEXIST)) {
390 DEBUG(5, ("mkdir(%s,%o) failed: %s\n", name, mode,
396 for (i=0; i<256; i++) {
398 path = talloc_asprintf(result, "%s/%2.2X", name, i);
400 DEBUG(0, ("asprintf failed\n"));
404 ret = mkdir(path, mode);
405 if ((ret != 0) && (errno != EEXIST)) {
406 DEBUG(5, ("mkdir(%s,%o) failed: %s\n", path,
407 mode, strerror(errno)));