2 Samba share mode database library external interface library.
3 Used by non-Samba products needing access to the Samba share mode db.
5 Copyright (C) Jeremy Allison 2005 - 2006
7 sharemodes_procid functions (C) Copyright (C) Volker Lendecke 2005
9 ** NOTE! The following LGPL license applies to this module only.
10 ** This does NOT imply that all of Samba is released
13 This library is free software; you can redistribute it and/or
14 modify it under the terms of the GNU Lesser General Public
15 License as published by the Free Software Foundation; either
16 version 3 of the License, or (at your option) any later version.
18 This library is distributed in the hope that it will be useful,
19 but WITHOUT ANY WARRANTY; without even the implied warranty of
20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 Lesser General Public License for more details.
23 You should have received a copy of the GNU Lesser General Public
24 License along with this library; if not, see <http://www.gnu.org/licenses/>.
28 #include "smb_share_modes.h"
30 /* Database context handle. */
35 /* Remove the paranoid malloc checker. */
40 int smb_create_share_mode_entry_ex(struct smbdb_ctx *db_ctx, uint64_t dev,
41 uint64_t ino, uint64_t extid,
42 const struct smb_share_mode_entry *new_entry,
43 const char *sharepath, const char *filename);
45 static bool sharemodes_procid_equal(const struct server_id *p1, const struct server_id *p2)
47 return (p1->pid == p2->pid);
50 static pid_t sharemodes_procid_to_pid(const struct server_id *proc)
56 * open/close sharemode database.
59 struct smbdb_ctx *smb_share_mode_db_open(const char *db_path)
61 struct smbdb_ctx *smb_db = (struct smbdb_ctx *)malloc(sizeof(struct smbdb_ctx));
67 memset(smb_db, '\0', sizeof(struct smbdb_ctx));
69 smb_db->smb_tdb = tdb_open(db_path,
70 0, TDB_DEFAULT|TDB_CLEAR_IF_FIRST|TDB_INCOMPATIBLE_HASH,
74 if (!smb_db->smb_tdb) {
79 /* Should check that this is the correct version.... */
83 /* key and data records in the tdb locking database */
90 int smb_share_mode_db_close(struct smbdb_ctx *db_ctx)
92 int ret = tdb_close(db_ctx->smb_tdb);
97 static TDB_DATA get_locking_key(struct locking_key *lk, uint64_t dev,
98 uint64_t ino, uint64_t extid)
102 memset(lk, '\0', sizeof(*lk));
103 lk->dev = (SMB_DEV_T)dev;
104 lk->inode = (SMB_INO_T)ino;
106 ld.dptr = (uint8 *)lk;
107 ld.dsize = sizeof(*lk);
112 * lock/unlock entry in sharemode database.
115 int smb_lock_share_mode_entry(struct smbdb_ctx *db_ctx,
120 struct locking_key lk;
121 return tdb_chainlock(db_ctx->smb_tdb, get_locking_key(&lk, dev, ino,
125 int smb_unlock_share_mode_entry(struct smbdb_ctx *db_ctx,
130 struct locking_key lk;
131 return tdb_chainunlock(db_ctx->smb_tdb,
132 get_locking_key(&lk, dev, ino, extid));
136 * Check if an external smb_share_mode_entry and an internal share_mode entry match.
139 static int share_mode_entry_equal(const struct smb_share_mode_entry *e_entry,
140 const struct share_mode_entry *entry)
142 return (sharemodes_procid_equal(&e_entry->pid, &entry->pid) &&
143 e_entry->file_id == (uint32_t)entry->share_file_id &&
144 e_entry->open_time.tv_sec == entry->time.tv_sec &&
145 e_entry->open_time.tv_usec == entry->time.tv_usec &&
146 e_entry->share_access == (uint32_t)entry->share_access &&
147 e_entry->access_mask == (uint32_t)entry->access_mask &&
148 e_entry->dev == entry->id.devid &&
149 e_entry->ino == entry->id.inode &&
150 e_entry->extid == entry->id.extid);
154 * Create an internal Samba share_mode entry from an external smb_share_mode_entry.
157 static void create_share_mode_entry(struct share_mode_entry *out,
158 const struct smb_share_mode_entry *in,
161 memset(out, '\0', sizeof(struct share_mode_entry));
164 out->share_file_id = (unsigned long)in->file_id;
165 out->time.tv_sec = in->open_time.tv_sec;
166 out->time.tv_usec = in->open_time.tv_usec;
167 out->share_access = in->share_access;
168 out->access_mask = in->access_mask;
169 out->id.devid = in->dev;
170 out->id.inode = in->ino;
171 out->id.extid = in->extid;
172 out->uid = (uint32)geteuid();
174 out->name_hash = name_hash;
178 * Return the current share mode list for an open file.
179 * This uses similar (but simplified) logic to locking/locking.c
182 int smb_get_share_mode_entries(struct smbdb_ctx *db_ctx,
186 struct smb_share_mode_entry **pp_list,
187 unsigned char *p_delete_on_close)
189 struct locking_key lk;
191 struct smb_share_mode_entry *list = NULL;
192 int num_share_modes = 0;
193 struct locking_data *ld = NULL; /* internal samba db state. */
194 struct share_mode_entry *shares = NULL;
199 *p_delete_on_close = 0;
201 db_data = tdb_fetch(db_ctx->smb_tdb, get_locking_key(&lk, dev, ino,
207 ld = (struct locking_data *)db_data.dptr;
208 num_share_modes = ld->u.s.num_share_mode_entries;
210 if (!num_share_modes) {
215 list = (struct smb_share_mode_entry *)malloc(sizeof(struct smb_share_mode_entry)*num_share_modes);
221 memset(list, '\0', num_share_modes * sizeof(struct smb_share_mode_entry));
223 shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct locking_data));
226 for (i = 0; i < num_share_modes; i++) {
227 struct share_mode_entry *share = &shares[i];
228 struct smb_share_mode_entry *sme = &list[list_num];
229 struct server_id pid = share->pid;
231 /* Check this process really exists. */
232 if (kill(sharemodes_procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) {
233 continue; /* No longer exists. */
236 /* Ignore deferred open entries. */
237 if (share->op_type == DEFERRED_OPEN_ENTRY) {
241 /* Copy into the external list. */
242 sme->dev = share->id.devid;
243 sme->ino = share->id.inode;
244 sme->extid = share->id.extid;
245 sme->share_access = (uint32_t)share->share_access;
246 sme->access_mask = (uint32_t)share->access_mask;
247 sme->open_time.tv_sec = share->time.tv_sec;
248 sme->open_time.tv_usec = share->time.tv_usec;
249 sme->file_id = (uint32_t)share->share_file_id;
250 sme->pid = share->pid;
260 *p_delete_on_close = ld->u.s.num_delete_token_entries != 0;
266 static uint32_t smb_name_hash(const char *sharepath, const char *filename, int *err)
269 char *fullpath = NULL;
274 ret = asprintf(&fullpath, "%s/%s", sharepath, filename);
279 key.dptr = (uint8_t *)fullpath;
280 key.dsize = strlen(fullpath) + 1;
281 name_hash = tdb_jenkins_hash(&key);
287 * Create an entry in the Samba share mode db.
290 int smb_create_share_mode_entry_ex(struct smbdb_ctx *db_ctx,
294 const struct smb_share_mode_entry *new_entry,
295 const char *sharepath, /* Must be absolute utf8 path. */
296 const char *filename) /* Must be relative utf8 path. */
299 struct locking_key lk;
300 TDB_DATA locking_key = get_locking_key(&lk, dev, ino, extid);
301 int orig_num_share_modes = 0;
302 struct locking_data *ld = NULL; /* internal samba db state. */
303 struct share_mode_entry *shares = NULL;
304 uint8 *new_data_p = NULL;
305 size_t new_data_size = 0;
307 uint32_t name_hash = smb_name_hash(sharepath, filename, &err);
313 db_data = tdb_fetch(db_ctx->smb_tdb, locking_key);
315 /* We must create the entry. */
316 db_data.dptr = (uint8 *)malloc(
317 sizeof(struct locking_data) +
318 sizeof(struct share_mode_entry) +
319 strlen(sharepath) + 1 +
320 strlen(filename) + 1);
324 ld = (struct locking_data *)db_data.dptr;
325 memset(ld, '\0', sizeof(struct locking_data));
326 ld->u.s.num_share_mode_entries = 1;
327 ld->u.s.num_delete_token_entries = 0;
328 shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct locking_data));
329 create_share_mode_entry(shares, new_entry, name_hash);
331 memcpy(db_data.dptr + sizeof(struct locking_data) + sizeof(struct share_mode_entry),
333 strlen(sharepath) + 1);
334 memcpy(db_data.dptr + sizeof(struct locking_data) + sizeof(struct share_mode_entry) +
335 strlen(sharepath) + 1,
337 strlen(filename) + 1);
339 db_data.dsize = sizeof(struct locking_data) + sizeof(struct share_mode_entry) +
340 strlen(sharepath) + 1 +
341 strlen(filename) + 1;
342 if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_INSERT) == -1) {
350 /* Entry exists, we must add a new entry. */
351 new_data_p = (uint8 *)malloc(
352 db_data.dsize + sizeof(struct share_mode_entry));
358 ld = (struct locking_data *)db_data.dptr;
359 orig_num_share_modes = ld->u.s.num_share_mode_entries;
361 /* Copy the original data. */
362 memcpy(new_data_p, db_data.dptr, sizeof(struct locking_data) + (orig_num_share_modes * sizeof(struct share_mode_entry)));
364 /* Add in the new share mode */
365 shares = (struct share_mode_entry *)(new_data_p + sizeof(struct locking_data) +
366 (orig_num_share_modes * sizeof(struct share_mode_entry)));
368 create_share_mode_entry(shares, new_entry, name_hash);
370 ld = (struct locking_data *)new_data_p;
371 ld->u.s.num_share_mode_entries++;
373 /* Append the original delete_tokens and filenames. */
374 memcpy(new_data_p + sizeof(struct locking_data) + (ld->u.s.num_share_mode_entries * sizeof(struct share_mode_entry)),
375 db_data.dptr + sizeof(struct locking_data) + (orig_num_share_modes * sizeof(struct share_mode_entry)),
376 db_data.dsize - sizeof(struct locking_data) - (orig_num_share_modes * sizeof(struct share_mode_entry)));
378 new_data_size = db_data.dsize + sizeof(struct share_mode_entry);
382 db_data.dptr = new_data_p;
383 db_data.dsize = new_data_size;
385 if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) {
394 * Create an entry in the Samba share mode db. Original interface - doesn't
395 * Distinguish between share path and filename. Fudge this by using a
396 * sharepath of / and a relative filename of (filename+1).
399 int smb_create_share_mode_entry(struct smbdb_ctx *db_ctx,
403 const struct smb_share_mode_entry *new_entry,
404 const char *filename) /* Must be absolute utf8 path. */
406 if (*filename != '/') {
409 return smb_create_share_mode_entry_ex(db_ctx, dev, ino, extid, new_entry,
413 int smb_delete_share_mode_entry(struct smbdb_ctx *db_ctx,
417 const struct smb_share_mode_entry *del_entry)
420 struct locking_key lk;
421 TDB_DATA locking_key = get_locking_key(&lk, dev, ino, extid);
422 int orig_num_share_modes = 0;
423 struct locking_data *ld = NULL; /* internal samba db state. */
424 struct share_mode_entry *shares = NULL;
425 uint8 *new_data_p = NULL;
426 size_t remaining_size = 0;
427 size_t i, num_share_modes;
428 const uint8 *remaining_ptr = NULL;
430 db_data = tdb_fetch(db_ctx->smb_tdb, locking_key);
432 return -1; /* Error - missing entry ! */
435 ld = (struct locking_data *)db_data.dptr;
436 orig_num_share_modes = ld->u.s.num_share_mode_entries;
437 shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct locking_data));
439 if (orig_num_share_modes == 1) {
440 /* Only one entry - better be ours... */
441 if (!share_mode_entry_equal(del_entry, shares)) {
442 /* Error ! We can't delete someone else's entry ! */
446 /* It's ours - just remove the entire record. */
448 return tdb_delete(db_ctx->smb_tdb, locking_key);
451 /* More than one - allocate a new record minus the one we'll delete. */
452 new_data_p = (uint8 *)malloc(
453 db_data.dsize - sizeof(struct share_mode_entry));
459 /* Copy the header. */
460 memcpy(new_data_p, db_data.dptr, sizeof(struct locking_data));
463 for (i = 0; i < orig_num_share_modes; i++) {
464 struct share_mode_entry *share = &shares[i];
465 struct server_id pid = share->pid;
467 /* Check this process really exists. */
468 if (kill(sharemodes_procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) {
469 continue; /* No longer exists. */
472 if (share_mode_entry_equal(del_entry, share)) {
473 continue; /* This is our delete taget. */
476 memcpy(new_data_p + sizeof(struct locking_data) +
477 (num_share_modes * sizeof(struct share_mode_entry)),
478 share, sizeof(struct share_mode_entry) );
483 if (num_share_modes == 0) {
484 /* None left after pruning. Delete record. */
487 return tdb_delete(db_ctx->smb_tdb, locking_key);
490 /* Copy any delete tokens plus the terminating filenames. */
491 remaining_ptr = db_data.dptr + sizeof(struct locking_data) + (orig_num_share_modes * sizeof(struct share_mode_entry));
492 remaining_size = db_data.dsize - (remaining_ptr - db_data.dptr);
494 memcpy(new_data_p + sizeof(struct locking_data) + (num_share_modes * sizeof(struct share_mode_entry)),
500 db_data.dptr = new_data_p;
502 /* Re-save smaller record. */
503 ld = (struct locking_data *)db_data.dptr;
504 ld->u.s.num_share_mode_entries = num_share_modes;
506 db_data.dsize = sizeof(struct locking_data) + (num_share_modes * sizeof(struct share_mode_entry)) + remaining_size;
508 if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) {
516 int smb_change_share_mode_entry(struct smbdb_ctx *db_ctx,
520 const struct smb_share_mode_entry *set_entry,
521 const struct smb_share_mode_entry *new_entry)
524 struct locking_key lk;
525 TDB_DATA locking_key = get_locking_key(&lk, dev, ino, extid);
526 int num_share_modes = 0;
527 struct locking_data *ld = NULL; /* internal samba db state. */
528 struct share_mode_entry *shares = NULL;
532 db_data = tdb_fetch(db_ctx->smb_tdb, locking_key);
534 return -1; /* Error - missing entry ! */
537 ld = (struct locking_data *)db_data.dptr;
538 num_share_modes = ld->u.s.num_share_mode_entries;
539 shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct locking_data));
541 for (i = 0; i < num_share_modes; i++) {
542 struct share_mode_entry *share = &shares[i];
543 struct server_id pid = share->pid;
545 /* Check this process really exists. */
546 if (kill(sharemodes_procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) {
547 continue; /* No longer exists. */
550 if (share_mode_entry_equal(set_entry, share)) {
551 create_share_mode_entry(share, new_entry, share->name_hash);
562 /* Save modified data. */
563 if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) {