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.
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 2 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, write to the Free Software
25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 #include "smb_share_modes.h"
31 /* Remove the paranoid malloc checker. */
36 static BOOL sharemodes_procid_equal(const struct process_id *p1, const struct process_id *p2)
38 return (p1->pid == p2->pid);
41 static pid_t sharemodes_procid_to_pid(const struct process_id *proc)
47 * open/close sharemode database.
50 struct smbdb_ctx *smb_share_mode_db_open(const char *db_path)
52 struct smbdb_ctx *smb_db = (struct smbdb_ctx *)malloc(sizeof(struct smbdb_ctx));
58 memset(smb_db, '\0', sizeof(struct smbdb_ctx));
60 smb_db->smb_tdb = tdb_open(db_path,
61 0, TDB_DEFAULT|TDB_CLEAR_IF_FIRST,
65 if (!smb_db->smb_tdb) {
70 /* Should check that this is the correct version.... */
74 /* key and data records in the tdb locking database */
80 int smb_share_mode_db_close(struct smbdb_ctx *db_ctx)
82 int ret = tdb_close(db_ctx->smb_tdb);
87 static TDB_DATA get_locking_key(uint64_t dev, uint64_t ino)
89 static struct locking_key lk;
92 memset(&lk, '\0', sizeof(struct locking_key));
93 lk.dev = (SMB_DEV_T)dev;
94 lk.inode = (SMB_INO_T)ino;
95 ld.dptr = (char *)&lk;
96 ld.dsize = sizeof(lk);
101 * lock/unlock entry in sharemode database.
104 int smb_lock_share_mode_entry(struct smbdb_ctx *db_ctx,
108 return tdb_chainlock(db_ctx->smb_tdb, get_locking_key(dev, ino));
111 int smb_unlock_share_mode_entry(struct smbdb_ctx *db_ctx,
115 return tdb_chainunlock(db_ctx->smb_tdb, get_locking_key(dev, ino));
118 /* Internal structure of Samba share mode db. */
119 /* FIXME ! This should be moved into a Samba include file. */
121 struct locking_data {
124 int num_share_mode_entries;
125 BOOL delete_on_close;
127 struct share_mode_entry dummy; /* Needed for alignment. */
129 /* the following two entries are implicit
130 struct share_mode_entry modes[num_share_mode_entries];
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, const struct share_mode_entry *entry)
141 return (sharemodes_procid_equal(&e_entry->pid, &entry->pid) &&
142 e_entry->file_id == (uint32_t)entry->share_file_id &&
143 e_entry->open_time.tv_sec == entry->time.tv_sec &&
144 e_entry->open_time.tv_usec == entry->time.tv_usec &&
145 e_entry->share_access == (uint32_t)entry->share_access &&
146 e_entry->access_mask == (uint32_t)entry->access_mask &&
147 e_entry->dev == (uint64_t)entry->dev &&
148 e_entry->ino == (uint64_t)entry->inode);
152 * Create an internal Samba share_mode entry from an external smb_share_mode_entry.
155 static void create_share_mode_entry(struct share_mode_entry *out, const struct smb_share_mode_entry *in)
157 memset(out, '\0', sizeof(struct share_mode_entry));
160 out->share_file_id = (unsigned long)in->file_id;
161 out->time.tv_sec = in->open_time.tv_sec;
162 out->time.tv_usec = in->open_time.tv_usec;
163 out->share_access = in->share_access;
164 out->access_mask = in->access_mask;
165 out->dev = (SMB_DEV_T)in->dev;
166 out->inode = (SMB_INO_T)in->ino;
170 * Return the current share mode list for an open file.
171 * This uses similar (but simplified) logic to locking/locking.c
174 int smb_get_share_mode_entries(struct smbdb_ctx *db_ctx,
177 struct smb_share_mode_entry **pp_list,
178 unsigned char *p_delete_on_close)
181 struct smb_share_mode_entry *list = NULL;
182 int num_share_modes = 0;
183 struct locking_data *ld = NULL; /* internal samba db state. */
184 struct share_mode_entry *shares = NULL;
189 *p_delete_on_close = 0;
191 db_data = tdb_fetch(db_ctx->smb_tdb, get_locking_key(dev, ino));
196 ld = (struct locking_data *)db_data.dptr;
197 num_share_modes = ld->u.s.num_share_mode_entries;
199 if (!num_share_modes) {
204 list = (struct smb_share_mode_entry *)malloc(sizeof(struct smb_share_mode_entry)*num_share_modes);
210 memset(list, '\0', num_share_modes * sizeof(struct smb_share_mode_entry));
212 shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct share_mode_entry));
215 for (i = 0; i < num_share_modes; i++) {
216 struct share_mode_entry *share = &shares[i];
217 struct smb_share_mode_entry *sme = &list[list_num];
218 struct process_id pid = share->pid;
220 /* Check this process really exists. */
221 if (kill(sharemodes_procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) {
222 continue; /* No longer exists. */
225 /* Ignore deferred open entries. */
226 if (share->op_type == DEFERRED_OPEN_ENTRY) {
230 /* Copy into the external list. */
231 sme->dev = (uint64_t)share->dev;
232 sme->ino = (uint64_t)share->inode;
233 sme->share_access = (uint32_t)share->share_access;
234 sme->access_mask = (uint32_t)share->access_mask;
235 sme->open_time.tv_sec = share->time.tv_sec;
236 sme->open_time.tv_usec = share->time.tv_usec;
237 sme->file_id = (uint32_t)share->share_file_id;
238 sme->pid = share->pid;
248 *p_delete_on_close = ld->u.s.delete_on_close;
255 * Create an entry in the Samba share mode db.
258 int smb_create_share_mode_entry_ex(struct smbdb_ctx *db_ctx,
261 const struct smb_share_mode_entry *new_entry,
262 const char *sharepath, /* Must be absolute utf8 path. */
263 const char *filename) /* Must be relative utf8 path. */
266 TDB_DATA locking_key = get_locking_key(dev, ino);
267 int orig_num_share_modes = 0;
268 struct locking_data *ld = NULL; /* internal samba db state. */
269 struct share_mode_entry *shares = NULL;
270 char *new_data_p = NULL;
271 size_t new_data_size = 0;
273 db_data = tdb_fetch(db_ctx->smb_tdb, locking_key);
275 /* We must create the entry. */
276 db_data.dptr = malloc((2*sizeof(struct share_mode_entry)) +
277 strlen(sharepath) + 1 +
278 strlen(filename) + 1);
282 ld = (struct locking_data *)db_data.dptr;
283 ld->u.s.num_share_mode_entries = 1;
284 ld->u.s.delete_on_close = 0;
285 shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct share_mode_entry));
286 create_share_mode_entry(shares, new_entry);
288 memcpy(db_data.dptr + 2*sizeof(struct share_mode_entry),
290 strlen(sharepath) + 1);
291 memcpy(db_data.dptr + 2*sizeof(struct share_mode_entry) +
292 strlen(sharepath) + 1,
294 strlen(filename) + 1);
296 db_data.dsize = 2*sizeof(struct share_mode_entry) +
297 strlen(sharepath) + 1 +
298 strlen(filename) + 1;
299 if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_INSERT) == -1) {
307 /* Entry exists, we must add a new entry. */
308 new_data_p = malloc(db_data.dsize + sizeof(struct share_mode_entry));
314 ld = (struct locking_data *)db_data.dptr;
315 orig_num_share_modes = ld->u.s.num_share_mode_entries;
317 /* Copy the original data. */
318 memcpy(new_data_p, db_data.dptr, (orig_num_share_modes+1)*sizeof(struct share_mode_entry));
320 /* Add in the new share mode */
321 shares = (struct share_mode_entry *)(new_data_p +
322 ((orig_num_share_modes+1)*sizeof(struct share_mode_entry)));
324 create_share_mode_entry(shares, new_entry);
326 ld = (struct locking_data *)new_data_p;
327 ld->u.s.num_share_mode_entries++;
329 /* Append the original filename */
330 memcpy(new_data_p + ((ld->u.s.num_share_mode_entries+1)*sizeof(struct share_mode_entry)),
331 db_data.dptr + ((orig_num_share_modes+1)*sizeof(struct share_mode_entry)),
332 db_data.dsize - ((orig_num_share_modes+1) * sizeof(struct share_mode_entry)));
334 new_data_size = db_data.dsize + sizeof(struct share_mode_entry);
338 db_data.dptr = new_data_p;
339 db_data.dsize = new_data_size;
341 if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) {
350 * Create an entry in the Samba share mode db. Original interface - doesn't
351 * Distinguish between share path and filename. Fudge this by using a
352 * sharepath of / and a relative filename of (filename+1).
355 int smb_create_share_mode_entry(struct smbdb_ctx *db_ctx,
358 const struct smb_share_mode_entry *new_entry,
359 const char *filename) /* Must be absolute utf8 path. */
361 if (*filename != '/') {
364 return smb_create_share_mode_entry_ex(db_ctx, dev, ino, new_entry,
368 int smb_delete_share_mode_entry(struct smbdb_ctx *db_ctx,
371 const struct smb_share_mode_entry *del_entry)
374 TDB_DATA locking_key = get_locking_key(dev, ino);
375 int orig_num_share_modes = 0;
376 struct locking_data *ld = NULL; /* internal samba db state. */
377 struct share_mode_entry *shares = NULL;
378 char *new_data_p = NULL;
379 size_t filename_size = 0;
380 size_t i, num_share_modes;
381 const char *fname_ptr = NULL;
383 db_data = tdb_fetch(db_ctx->smb_tdb, locking_key);
385 return -1; /* Error - missing entry ! */
388 ld = (struct locking_data *)db_data.dptr;
389 orig_num_share_modes = ld->u.s.num_share_mode_entries;
390 shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct share_mode_entry));
392 if (orig_num_share_modes == 1) {
393 /* Only one entry - better be ours... */
394 if (!share_mode_entry_equal(del_entry, shares)) {
395 /* Error ! We can't delete someone else's entry ! */
399 /* It's ours - just remove the entire record. */
401 return tdb_delete(db_ctx->smb_tdb, locking_key);
404 /* More than one - allocate a new record minus the one we'll delete. */
405 new_data_p = malloc(db_data.dsize - sizeof(struct share_mode_entry));
411 /* Copy the header. */
412 memcpy(new_data_p, db_data.dptr, sizeof(struct share_mode_entry));
415 for (i = 0; i < orig_num_share_modes; i++) {
416 struct share_mode_entry *share = &shares[i];
417 struct process_id pid = share->pid;
419 /* Check this process really exists. */
420 if (kill(sharemodes_procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) {
421 continue; /* No longer exists. */
424 if (share_mode_entry_equal(del_entry, share)) {
425 continue; /* This is our delete taget. */
428 memcpy(new_data_p + ((num_share_modes+1)*sizeof(struct share_mode_entry)),
429 share, sizeof(struct share_mode_entry) );
434 if (num_share_modes == 0) {
435 /* None left after pruning. Delete record. */
438 return tdb_delete(db_ctx->smb_tdb, locking_key);
441 /* Copy the terminating filename. */
442 fname_ptr = db_data.dptr + ((orig_num_share_modes+1) * sizeof(struct share_mode_entry));
443 filename_size = db_data.dsize - (fname_ptr - db_data.dptr);
445 memcpy(new_data_p + ((num_share_modes+1)*sizeof(struct share_mode_entry)),
451 db_data.dptr = new_data_p;
453 /* Re-save smaller record. */
454 ld = (struct locking_data *)db_data.dptr;
455 ld->u.s.num_share_mode_entries = num_share_modes;
457 db_data.dsize = ((num_share_modes+1)*sizeof(struct share_mode_entry)) + filename_size;
459 if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) {
467 int smb_change_share_mode_entry(struct smbdb_ctx *db_ctx,
470 const struct smb_share_mode_entry *set_entry,
471 const struct smb_share_mode_entry *new_entry)
474 TDB_DATA locking_key = get_locking_key(dev, ino);
475 int num_share_modes = 0;
476 struct locking_data *ld = NULL; /* internal samba db state. */
477 struct share_mode_entry *shares = NULL;
481 db_data = tdb_fetch(db_ctx->smb_tdb, locking_key);
483 return -1; /* Error - missing entry ! */
486 ld = (struct locking_data *)db_data.dptr;
487 num_share_modes = ld->u.s.num_share_mode_entries;
488 shares = (struct share_mode_entry *)(db_data.dptr + sizeof(struct share_mode_entry));
490 for (i = 0; i < num_share_modes; i++) {
491 struct share_mode_entry *share = &shares[i];
492 struct process_id pid = share->pid;
494 /* Check this process really exists. */
495 if (kill(sharemodes_procid_to_pid(&pid), 0) == -1 && (errno == ESRCH)) {
496 continue; /* No longer exists. */
499 if (share_mode_entry_equal(set_entry, share)) {
500 create_share_mode_entry(share, new_entry);
511 /* Save modified data. */
512 if (tdb_store(db_ctx->smb_tdb, locking_key, db_data, TDB_REPLACE) == -1) {