2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 2000
5 Copyright (C) Jeremy Allison 1994-1998
6 Copyright (C) Volker Lendecke 2007
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 struct notify_change_request {
26 struct notify_change_request *prev, *next;
27 struct files_struct *fsp; /* backpointer for cancel by mid */
28 char request_buf[smb_size];
30 uint32 current_bufsize;
31 struct notify_mid_map *mid_map;
35 static void notify_fsp(files_struct *fsp, uint32 action, const char *name);
37 static struct notify_mid_map *notify_changes_by_mid;
40 * For NTCancel, we need to find the notify_change_request indexed by
41 * mid. Separate list here.
44 struct notify_mid_map {
45 struct notify_mid_map *prev, *next;
46 struct notify_change_request *req;
50 static BOOL notify_marshall_changes(int num_changes,
51 struct notify_change *changes,
57 for (i=0; i<num_changes; i++) {
58 struct notify_change *c = &changes[i];
60 uint32 u32_tmp; /* Temp arg to prs_uint32 to avoid
61 * signed/unsigned issues */
63 namelen = convert_string_allocate(
64 NULL, CH_UNIX, CH_UTF16LE, c->name, strlen(c->name)+1,
65 &uni_name.buffer, True);
66 if ((namelen == -1) || (uni_name.buffer == NULL)) {
70 namelen -= 2; /* Dump NULL termination */
73 * Offset to next entry, only if there is one
76 u32_tmp = (i == num_changes-1) ? 0 : namelen + 12;
77 if (!prs_uint32("offset", ps, 1, &u32_tmp)) goto fail;
80 if (!prs_uint32("action", ps, 1, &u32_tmp)) goto fail;
83 if (!prs_uint32("namelen", ps, 1, &u32_tmp)) goto fail;
85 if (!prs_unistr("name", ps, 1, &uni_name)) goto fail;
88 * Not NULL terminated, decrease by the 2 UCS2 \0 chars
90 prs_set_offset(ps, prs_offset(ps)-2);
92 SAFE_FREE(uni_name.buffer);
98 SAFE_FREE(uni_name.buffer);
102 /****************************************************************************
103 Setup the common parts of the return packet and send it.
104 *****************************************************************************/
106 static void change_notify_reply_packet(const char *request_buf,
109 const char *inbuf = request_buf;
110 char outbuf[smb_size+38];
112 memset(outbuf, '\0', sizeof(outbuf));
113 construct_reply_common(request_buf, outbuf);
115 ERROR_NT(error_code);
118 * Seems NT needs a transact command with an error code
119 * in it. This is a longer packet than a simple error.
121 set_message(inbuf,outbuf,18,0,False);
124 if (!send_smb(smbd_server_fd(),outbuf))
125 exit_server_cleanly("change_notify_reply_packet: send_smb "
129 void change_notify_reply(const char *request_buf,
130 struct notify_change_buf *notify_buf)
136 if (notify_buf->num_changes == -1) {
137 change_notify_reply_packet(request_buf, NT_STATUS_OK);
141 if (!prs_init(&ps, 0, NULL, False)
142 || !notify_marshall_changes(notify_buf->num_changes,
143 notify_buf->changes, &ps)) {
144 change_notify_reply_packet(request_buf, NT_STATUS_NO_MEMORY);
148 buflen = smb_size+38+prs_offset(&ps) + 4 /* padding */;
150 if (!(outbuf = SMB_MALLOC_ARRAY(char, buflen))) {
151 change_notify_reply_packet(request_buf, NT_STATUS_NO_MEMORY);
155 construct_reply_common(request_buf, outbuf);
157 if (send_nt_replies(request_buf, outbuf, buflen, NT_STATUS_OK, prs_data_p(&ps),
158 prs_offset(&ps), NULL, 0) == -1) {
159 exit_server("change_notify_reply_packet: send_smb failed.");
166 TALLOC_FREE(notify_buf->changes);
167 notify_buf->num_changes = 0;
170 static void notify_callback(void *private_data, const struct notify_event *e)
172 files_struct *fsp = (files_struct *)private_data;
173 DEBUG(10, ("notify_callback called for %s\n", fsp->fsp_name));
174 notify_fsp(fsp, e->action, e->path);
177 NTSTATUS change_notify_create(struct files_struct *fsp, uint32 filter,
181 struct notify_entry e;
184 SMB_ASSERT(fsp->notify == NULL);
186 if (!(fsp->notify = TALLOC_ZERO_P(NULL, struct notify_change_buf))) {
187 DEBUG(0, ("talloc failed\n"));
188 return NT_STATUS_NO_MEMORY;
191 if (asprintf(&fullpath, "%s/%s", fsp->conn->connectpath,
192 fsp->fsp_name) == -1) {
193 DEBUG(0, ("asprintf failed\n"));
194 return NT_STATUS_NO_MEMORY;
201 e.subdir_filter = filter;
204 status = notify_add(fsp->conn->notify_ctx, &e, notify_callback, fsp);
210 NTSTATUS change_notify_add_request(const char *inbuf,
211 uint32 filter, BOOL recursive,
212 struct files_struct *fsp)
214 struct notify_change_request *request = NULL;
215 struct notify_mid_map *map = NULL;
217 if (!(request = SMB_MALLOC_P(struct notify_change_request))
218 || !(map = SMB_MALLOC_P(struct notify_mid_map))) {
220 return NT_STATUS_NO_MEMORY;
223 request->mid_map = map;
226 memcpy(request->request_buf, inbuf, sizeof(request->request_buf));
227 request->current_bufsize = 0;
228 request->filter = filter;
230 request->backend_data = NULL;
232 DLIST_ADD_END(fsp->notify->requests, request,
233 struct notify_change_request *);
235 map->mid = SVAL(inbuf, smb_mid);
236 DLIST_ADD(notify_changes_by_mid, map);
238 /* Push the MID of this packet on the signing queue. */
239 srv_defer_sign_response(SVAL(inbuf,smb_mid));
244 static void change_notify_remove_request(struct notify_change_request *remove_req)
247 struct notify_change_request *req;
250 * Paranoia checks, the fsp referenced must must have the request in
251 * its list of pending requests
254 fsp = remove_req->fsp;
255 SMB_ASSERT(fsp->notify != NULL);
257 for (req = fsp->notify->requests; req; req = req->next) {
258 if (req == remove_req) {
264 smb_panic("notify_req not found in fsp's requests");
267 DLIST_REMOVE(fsp->notify->requests, req);
268 DLIST_REMOVE(notify_changes_by_mid, req->mid_map);
269 SAFE_FREE(req->mid_map);
270 TALLOC_FREE(req->backend_data);
274 /****************************************************************************
275 Delete entries by mid from the change notify pending queue. Always send reply.
276 *****************************************************************************/
278 void remove_pending_change_notify_requests_by_mid(uint16 mid)
280 struct notify_mid_map *map;
282 for (map = notify_changes_by_mid; map; map = map->next) {
283 if (map->mid == mid) {
292 change_notify_reply_packet(map->req->request_buf, NT_STATUS_CANCELLED);
293 change_notify_remove_request(map->req);
296 /****************************************************************************
297 Delete entries by fnum from the change notify pending queue.
298 *****************************************************************************/
300 void remove_pending_change_notify_requests_by_fid(files_struct *fsp,
303 if (fsp->notify == NULL) {
307 while (fsp->notify->requests != NULL) {
308 change_notify_reply_packet(
309 fsp->notify->requests->request_buf, status);
310 change_notify_remove_request(fsp->notify->requests);
314 void notify_fname(connection_struct *conn, uint32 action, uint32 filter,
319 if (asprintf(&fullpath, "%s/%s", conn->connectpath, path) == -1) {
320 DEBUG(0, ("asprintf failed\n"));
324 notify_trigger(conn->notify_ctx, action, filter, fullpath);
328 static void notify_fsp(files_struct *fsp, uint32 action, const char *name)
330 struct notify_change *change, *changes;
333 if (fsp->notify == NULL) {
335 * Nobody is waiting, don't queue
341 * Someone has triggered a notify previously, queue the change for
345 if ((fsp->notify->num_changes > 1000) || (name == NULL)) {
347 * The real number depends on the client buf, just provide a
348 * guard against a DoS here.
350 TALLOC_FREE(fsp->notify->changes);
351 fsp->notify->num_changes = -1;
355 if (fsp->notify->num_changes == -1) {
359 if (!(changes = TALLOC_REALLOC_ARRAY(
360 fsp->notify, fsp->notify->changes,
361 struct notify_change, fsp->notify->num_changes+1))) {
362 DEBUG(0, ("talloc_realloc failed\n"));
366 fsp->notify->changes = changes;
368 change = &(fsp->notify->changes[fsp->notify->num_changes]);
370 if (!(tmp = talloc_strdup(changes, name))) {
371 DEBUG(0, ("talloc_strdup failed\n"));
375 string_replace(tmp, '/', '\\');
378 change->action = action;
379 fsp->notify->num_changes += 1;
381 if (fsp->notify->requests == NULL) {
383 * Nobody is waiting, so don't send anything. The ot
388 if (action == NOTIFY_ACTION_OLD_NAME) {
390 * We have to send the two rename events in one reply. So hold
391 * the first part back.
397 * Someone is waiting for the change, trigger the reply immediately.
399 * TODO: do we have to walk the lists of requests pending?
402 change_notify_reply(fsp->notify->requests->request_buf,
405 change_notify_remove_request(fsp->notify->requests);
408 char *notify_filter_string(TALLOC_CTX *mem_ctx, uint32 filter)
412 result = talloc_strdup(mem_ctx, "");
414 if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
415 result = talloc_asprintf_append(result, "FILE_NAME|");
416 if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
417 result = talloc_asprintf_append(result, "DIR_NAME|");
418 if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
419 result = talloc_asprintf_append(result, "ATTRIBUTES|");
420 if (filter & FILE_NOTIFY_CHANGE_SIZE)
421 result = talloc_asprintf_append(result, "SIZE|");
422 if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
423 result = talloc_asprintf_append(result, "LAST_WRITE|");
424 if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
425 result = talloc_asprintf_append(result, "LAST_ACCESS|");
426 if (filter & FILE_NOTIFY_CHANGE_CREATION)
427 result = talloc_asprintf_append(result, "CREATION|");
428 if (filter & FILE_NOTIFY_CHANGE_EA)
429 result = talloc_asprintf_append(result, "EA|");
430 if (filter & FILE_NOTIFY_CHANGE_SECURITY)
431 result = talloc_asprintf_append(result, "SECURITY|");
432 if (filter & FILE_NOTIFY_CHANGE_STREAM_NAME)
433 result = talloc_asprintf_append(result, "STREAM_NAME|");
434 if (filter & FILE_NOTIFY_CHANGE_STREAM_SIZE)
435 result = talloc_asprintf_append(result, "STREAM_SIZE|");
436 if (filter & FILE_NOTIFY_CHANGE_STREAM_WRITE)
437 result = talloc_asprintf_append(result, "STREAM_WRITE|");
439 if (result == NULL) return NULL;
440 if (*result == '\0') return result;
442 result[strlen(result)-1] = '\0';
446 struct sys_notify_context *sys_notify_context_create(connection_struct *conn,
448 struct event_context *ev)
450 struct sys_notify_context *ctx;
452 if (!(ctx = TALLOC_P(mem_ctx, struct sys_notify_context))) {
453 DEBUG(0, ("talloc failed\n"));
459 ctx->private_data = NULL;
463 NTSTATUS sys_notify_watch(struct sys_notify_context *ctx,
464 struct notify_entry *e,
465 void (*callback)(struct sys_notify_context *ctx,
467 struct notify_event *ev),
468 void *private_data, void *handle)
470 return SMB_VFS_NOTIFY_WATCH(ctx->conn, ctx, e, callback, private_data,