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 /* Max size we can send to client in a notify response. */
28 struct notify_change_request {
29 struct notify_change_request *prev, *next;
30 struct files_struct *fsp; /* backpointer for cancel by mid */
31 char request_buf[smb_size];
33 uint32 current_bufsize;
34 struct notify_mid_map *mid_map;
38 static void notify_fsp(files_struct *fsp, uint32 action, const char *name);
40 static struct notify_mid_map *notify_changes_by_mid;
43 * For NTCancel, we need to find the notify_change_request indexed by
44 * mid. Separate list here.
47 struct notify_mid_map {
48 struct notify_mid_map *prev, *next;
49 struct notify_change_request *req;
53 static BOOL notify_marshall_changes(int num_changes,
54 struct notify_change *changes,
60 for (i=0; i<num_changes; i++) {
61 struct notify_change *c = &changes[i];
63 uint32 u32_tmp; /* Temp arg to prs_uint32 to avoid
64 * signed/unsigned issues */
66 namelen = convert_string_allocate(
67 NULL, CH_UNIX, CH_UTF16LE, c->name, strlen(c->name)+1,
68 &uni_name.buffer, True);
69 if ((namelen == -1) || (uni_name.buffer == NULL)) {
73 namelen -= 2; /* Dump NULL termination */
76 * Offset to next entry, only if there is one
79 u32_tmp = (i == num_changes-1) ? 0 : namelen + 12;
80 if (!prs_uint32("offset", ps, 1, &u32_tmp)) goto fail;
83 if (!prs_uint32("action", ps, 1, &u32_tmp)) goto fail;
86 if (!prs_uint32("namelen", ps, 1, &u32_tmp)) goto fail;
88 if (!prs_unistr("name", ps, 1, &uni_name)) goto fail;
91 * Not NULL terminated, decrease by the 2 UCS2 \0 chars
93 prs_set_offset(ps, prs_offset(ps)-2);
95 SAFE_FREE(uni_name.buffer);
101 SAFE_FREE(uni_name.buffer);
105 /****************************************************************************
106 Setup the common parts of the return packet and send it.
107 *****************************************************************************/
109 static void change_notify_reply_packet(const char *request_buf,
112 const char *inbuf = request_buf;
113 char outbuf[smb_size+38];
115 memset(outbuf, '\0', sizeof(outbuf));
116 construct_reply_common(request_buf, outbuf);
118 ERROR_NT(error_code);
121 * Seems NT needs a transact command with an error code
122 * in it. This is a longer packet than a simple error.
124 set_message(inbuf,outbuf,18,0,False);
127 if (!send_smb(smbd_server_fd(),outbuf))
128 exit_server_cleanly("change_notify_reply_packet: send_smb "
132 void change_notify_reply(const char *request_buf,
133 struct notify_change_buf *notify_buf)
139 if (notify_buf->num_changes == -1) {
140 change_notify_reply_packet(request_buf, NT_STATUS_OK);
144 if (!prs_init(&ps, 0, NULL, False)
145 || !notify_marshall_changes(notify_buf->num_changes,
146 notify_buf->changes, &ps)) {
147 change_notify_reply_packet(request_buf, NT_STATUS_NO_MEMORY);
151 buflen = smb_size+38+prs_offset(&ps) + 4 /* padding */;
153 if (buflen > max_send) {
155 * We exceed what the client is willing to accept. Send
158 change_notify_reply_packet(request_buf, NT_STATUS_OK);
162 if (!(outbuf = SMB_MALLOC_ARRAY(char, buflen))) {
163 change_notify_reply_packet(request_buf, NT_STATUS_NO_MEMORY);
167 construct_reply_common(request_buf, outbuf);
169 if (send_nt_replies(request_buf, outbuf, buflen, NT_STATUS_OK, prs_data_p(&ps),
170 prs_offset(&ps), NULL, 0) == -1) {
171 exit_server("change_notify_reply_packet: send_smb failed.");
178 TALLOC_FREE(notify_buf->changes);
179 notify_buf->num_changes = 0;
182 static void notify_callback(void *private_data, const struct notify_event *e)
184 files_struct *fsp = (files_struct *)private_data;
185 DEBUG(10, ("notify_callback called for %s\n", fsp->fsp_name));
186 notify_fsp(fsp, e->action, e->path);
189 NTSTATUS change_notify_create(struct files_struct *fsp, uint32 filter,
193 struct notify_entry e;
196 SMB_ASSERT(fsp->notify == NULL);
198 if (!(fsp->notify = TALLOC_ZERO_P(NULL, struct notify_change_buf))) {
199 DEBUG(0, ("talloc failed\n"));
200 return NT_STATUS_NO_MEMORY;
203 if (asprintf(&fullpath, "%s/%s", fsp->conn->connectpath,
204 fsp->fsp_name) == -1) {
205 DEBUG(0, ("asprintf failed\n"));
206 return NT_STATUS_NO_MEMORY;
213 e.subdir_filter = filter;
216 status = notify_add(fsp->conn->notify_ctx, &e, notify_callback, fsp);
222 NTSTATUS change_notify_add_request(const char *inbuf,
223 uint32 filter, BOOL recursive,
224 struct files_struct *fsp)
226 struct notify_change_request *request = NULL;
227 struct notify_mid_map *map = NULL;
229 if (!(request = SMB_MALLOC_P(struct notify_change_request))
230 || !(map = SMB_MALLOC_P(struct notify_mid_map))) {
232 return NT_STATUS_NO_MEMORY;
235 request->mid_map = map;
238 memcpy(request->request_buf, inbuf, sizeof(request->request_buf));
239 request->current_bufsize = 0;
240 request->filter = filter;
242 request->backend_data = NULL;
244 DLIST_ADD_END(fsp->notify->requests, request,
245 struct notify_change_request *);
247 map->mid = SVAL(inbuf, smb_mid);
248 DLIST_ADD(notify_changes_by_mid, map);
250 /* Push the MID of this packet on the signing queue. */
251 srv_defer_sign_response(SVAL(inbuf,smb_mid));
256 static void change_notify_remove_request(struct notify_change_request *remove_req)
259 struct notify_change_request *req;
262 * Paranoia checks, the fsp referenced must must have the request in
263 * its list of pending requests
266 fsp = remove_req->fsp;
267 SMB_ASSERT(fsp->notify != NULL);
269 for (req = fsp->notify->requests; req; req = req->next) {
270 if (req == remove_req) {
276 smb_panic("notify_req not found in fsp's requests");
279 DLIST_REMOVE(fsp->notify->requests, req);
280 DLIST_REMOVE(notify_changes_by_mid, req->mid_map);
281 SAFE_FREE(req->mid_map);
282 TALLOC_FREE(req->backend_data);
286 /****************************************************************************
287 Delete entries by mid from the change notify pending queue. Always send reply.
288 *****************************************************************************/
290 void remove_pending_change_notify_requests_by_mid(uint16 mid)
292 struct notify_mid_map *map;
294 for (map = notify_changes_by_mid; map; map = map->next) {
295 if (map->mid == mid) {
304 change_notify_reply_packet(map->req->request_buf, NT_STATUS_CANCELLED);
305 change_notify_remove_request(map->req);
308 /****************************************************************************
309 Delete entries by fnum from the change notify pending queue.
310 *****************************************************************************/
312 void remove_pending_change_notify_requests_by_fid(files_struct *fsp,
315 if (fsp->notify == NULL) {
319 while (fsp->notify->requests != NULL) {
320 change_notify_reply_packet(
321 fsp->notify->requests->request_buf, status);
322 change_notify_remove_request(fsp->notify->requests);
326 void notify_fname(connection_struct *conn, uint32 action, uint32 filter,
331 if (asprintf(&fullpath, "%s/%s", conn->connectpath, path) == -1) {
332 DEBUG(0, ("asprintf failed\n"));
336 notify_trigger(conn->notify_ctx, action, filter, fullpath);
340 static void notify_fsp(files_struct *fsp, uint32 action, const char *name)
342 struct notify_change *change, *changes;
345 if (fsp->notify == NULL) {
347 * Nobody is waiting, don't queue
353 * Someone has triggered a notify previously, queue the change for
357 if ((fsp->notify->num_changes > 1000) || (name == NULL)) {
359 * The real number depends on the client buf, just provide a
360 * guard against a DoS here.
362 TALLOC_FREE(fsp->notify->changes);
363 fsp->notify->num_changes = -1;
367 if (fsp->notify->num_changes == -1) {
371 if (!(changes = TALLOC_REALLOC_ARRAY(
372 fsp->notify, fsp->notify->changes,
373 struct notify_change, fsp->notify->num_changes+1))) {
374 DEBUG(0, ("talloc_realloc failed\n"));
378 fsp->notify->changes = changes;
380 change = &(fsp->notify->changes[fsp->notify->num_changes]);
382 if (!(tmp = talloc_strdup(changes, name))) {
383 DEBUG(0, ("talloc_strdup failed\n"));
387 string_replace(tmp, '/', '\\');
390 change->action = action;
391 fsp->notify->num_changes += 1;
393 if (fsp->notify->requests == NULL) {
395 * Nobody is waiting, so don't send anything. The ot
400 if (action == NOTIFY_ACTION_OLD_NAME) {
402 * We have to send the two rename events in one reply. So hold
403 * the first part back.
409 * Someone is waiting for the change, trigger the reply immediately.
411 * TODO: do we have to walk the lists of requests pending?
414 change_notify_reply(fsp->notify->requests->request_buf,
417 change_notify_remove_request(fsp->notify->requests);
420 char *notify_filter_string(TALLOC_CTX *mem_ctx, uint32 filter)
424 result = talloc_strdup(mem_ctx, "");
426 if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
427 result = talloc_asprintf_append(result, "FILE_NAME|");
428 if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
429 result = talloc_asprintf_append(result, "DIR_NAME|");
430 if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
431 result = talloc_asprintf_append(result, "ATTRIBUTES|");
432 if (filter & FILE_NOTIFY_CHANGE_SIZE)
433 result = talloc_asprintf_append(result, "SIZE|");
434 if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
435 result = talloc_asprintf_append(result, "LAST_WRITE|");
436 if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
437 result = talloc_asprintf_append(result, "LAST_ACCESS|");
438 if (filter & FILE_NOTIFY_CHANGE_CREATION)
439 result = talloc_asprintf_append(result, "CREATION|");
440 if (filter & FILE_NOTIFY_CHANGE_EA)
441 result = talloc_asprintf_append(result, "EA|");
442 if (filter & FILE_NOTIFY_CHANGE_SECURITY)
443 result = talloc_asprintf_append(result, "SECURITY|");
444 if (filter & FILE_NOTIFY_CHANGE_STREAM_NAME)
445 result = talloc_asprintf_append(result, "STREAM_NAME|");
446 if (filter & FILE_NOTIFY_CHANGE_STREAM_SIZE)
447 result = talloc_asprintf_append(result, "STREAM_SIZE|");
448 if (filter & FILE_NOTIFY_CHANGE_STREAM_WRITE)
449 result = talloc_asprintf_append(result, "STREAM_WRITE|");
451 if (result == NULL) return NULL;
452 if (*result == '\0') return result;
454 result[strlen(result)-1] = '\0';
458 struct sys_notify_context *sys_notify_context_create(connection_struct *conn,
460 struct event_context *ev)
462 struct sys_notify_context *ctx;
464 if (!(ctx = TALLOC_P(mem_ctx, struct sys_notify_context))) {
465 DEBUG(0, ("talloc failed\n"));
471 ctx->private_data = NULL;
475 NTSTATUS sys_notify_watch(struct sys_notify_context *ctx,
476 struct notify_entry *e,
477 void (*callback)(struct sys_notify_context *ctx,
479 struct notify_event *ev),
480 void *private_data, void *handle)
482 return SMB_VFS_NOTIFY_WATCH(ctx->conn, ctx, e, callback, private_data,