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2779cae823
Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
650 lines
16 KiB
C
650 lines
16 KiB
C
/*
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Unix SMB/CIFS implementation.
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change notify handling
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Copyright (C) Andrew Tridgell 2000
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Copyright (C) Jeremy Allison 1994-1998
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Copyright (C) Volker Lendecke 2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "smbd/smbd.h"
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#include "smbd/globals.h"
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#include "../librpc/gen_ndr/ndr_notify.h"
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#include "librpc/gen_ndr/ndr_file_id.h"
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struct notify_change_event {
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struct timespec when;
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uint32_t action;
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const char *name;
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};
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struct notify_change_buf {
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/*
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* If no requests are pending, changes are queued here. Simple array,
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* we only append.
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*/
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/*
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* num_changes == -1 means that we have got a catch-all change, when
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* asked we just return NT_STATUS_OK without specific changes.
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*/
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int num_changes;
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struct notify_change_event *changes;
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/*
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* If no changes are around requests are queued here. Using a linked
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* list, because we have to append at the end and delete from the top.
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*/
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struct notify_change_request *requests;
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};
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struct notify_change_request {
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struct notify_change_request *prev, *next;
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struct files_struct *fsp; /* backpointer for cancel by mid */
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struct smb_request *req;
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uint32_t filter;
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uint32_t max_param;
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void (*reply_fn)(struct smb_request *req,
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NTSTATUS error_code,
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uint8_t *buf, size_t len);
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struct notify_mid_map *mid_map;
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void *backend_data;
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};
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static void notify_fsp(files_struct *fsp, struct timespec when,
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uint32_t action, const char *name);
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bool change_notify_fsp_has_changes(struct files_struct *fsp)
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{
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if (fsp == NULL) {
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return false;
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}
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if (fsp->notify == NULL) {
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return false;
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}
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if (fsp->notify->num_changes == 0) {
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return false;
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}
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return true;
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}
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/*
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* For NTCancel, we need to find the notify_change_request indexed by
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* mid. Separate list here.
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*/
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struct notify_mid_map {
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struct notify_mid_map *prev, *next;
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struct notify_change_request *req;
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uint64_t mid;
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};
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static bool notify_change_record_identical(struct notify_change_event *c1,
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struct notify_change_event *c2)
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{
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/* Note this is deliberately case sensitive. */
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if (c1->action == c2->action &&
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strcmp(c1->name, c2->name) == 0) {
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return True;
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}
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return False;
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}
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static int compare_notify_change_events(const void *p1, const void *p2)
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{
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const struct notify_change_event *e1 = p1;
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const struct notify_change_event *e2 = p2;
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return timespec_compare(&e1->when, &e2->when);
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}
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static bool notify_marshall_changes(int num_changes,
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uint32_t max_offset,
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struct notify_change_event *changes,
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DATA_BLOB *final_blob)
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{
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int i;
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if (num_changes == -1) {
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return false;
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}
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/*
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* Sort the notifies by timestamp when the event happened to avoid
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* coalescing and thus dropping events.
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*/
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qsort(changes, num_changes,
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sizeof(*changes), compare_notify_change_events);
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for (i=0; i<num_changes; i++) {
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enum ndr_err_code ndr_err;
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struct notify_change_event *c;
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struct FILE_NOTIFY_INFORMATION m;
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DATA_BLOB blob;
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uint16_t pad = 0;
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/* Coalesce any identical records. */
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while (i+1 < num_changes &&
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notify_change_record_identical(&changes[i],
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&changes[i+1])) {
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i++;
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}
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c = &changes[i];
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m.FileName1 = c->name;
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m.FileNameLength = strlen_m(c->name)*2;
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m.Action = c->action;
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m._pad = data_blob_null;
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/*
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* Offset to next entry, only if there is one
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*/
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if (i == (num_changes-1)) {
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m.NextEntryOffset = 0;
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} else {
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if ((m.FileNameLength % 4) == 2) {
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m._pad = data_blob_const(&pad, 2);
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}
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m.NextEntryOffset =
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ndr_size_FILE_NOTIFY_INFORMATION(&m, 0);
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}
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ndr_err = ndr_push_struct_blob(&blob, talloc_tos(), &m,
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(ndr_push_flags_fn_t)ndr_push_FILE_NOTIFY_INFORMATION);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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return false;
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}
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if (DEBUGLEVEL >= 10) {
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NDR_PRINT_DEBUG(FILE_NOTIFY_INFORMATION, &m);
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}
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if (!data_blob_append(talloc_tos(), final_blob,
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blob.data, blob.length)) {
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data_blob_free(&blob);
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return false;
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}
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data_blob_free(&blob);
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if (final_blob->length > max_offset) {
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/* Too much data for client. */
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DEBUG(10, ("Client only wanted %d bytes, trying to "
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"marshall %d bytes\n", (int)max_offset,
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(int)final_blob->length));
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return False;
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}
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}
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return True;
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}
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/****************************************************************************
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Setup the common parts of the return packet and send it.
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*****************************************************************************/
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void change_notify_reply(struct smb_request *req,
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NTSTATUS error_code,
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uint32_t max_param,
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struct notify_change_buf *notify_buf,
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void (*reply_fn)(struct smb_request *req,
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NTSTATUS error_code,
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uint8_t *buf, size_t len))
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{
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DATA_BLOB blob = data_blob_null;
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if (!NT_STATUS_IS_OK(error_code)) {
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reply_fn(req, error_code, NULL, 0);
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return;
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}
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if (max_param == 0 || notify_buf == NULL) {
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reply_fn(req, NT_STATUS_OK, NULL, 0);
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return;
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}
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if (!notify_marshall_changes(notify_buf->num_changes, max_param,
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notify_buf->changes, &blob)) {
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/*
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* We exceed what the client is willing to accept. Send
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* nothing.
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*/
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data_blob_free(&blob);
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}
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reply_fn(req, NT_STATUS_OK, blob.data, blob.length);
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data_blob_free(&blob);
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TALLOC_FREE(notify_buf->changes);
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notify_buf->num_changes = 0;
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}
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void notify_callback(void *private_data, struct timespec when,
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const struct notify_event *e)
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{
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files_struct *fsp = (files_struct *)private_data;
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DEBUG(10, ("notify_callback called for %s\n", fsp_str_dbg(fsp)));
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notify_fsp(fsp, when, e->action, e->path);
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}
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NTSTATUS change_notify_create(struct files_struct *fsp, uint32_t filter,
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bool recursive)
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{
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size_t len = fsp_fullbasepath(fsp, NULL, 0);
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char fullpath[len+1];
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uint32_t subdir_filter;
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NTSTATUS status = NT_STATUS_NOT_IMPLEMENTED;
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if (fsp->notify != NULL) {
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DEBUG(1, ("change_notify_create: fsp->notify != NULL, "
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"fname = %s\n", fsp->fsp_name->base_name));
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (!(fsp->notify = talloc_zero(NULL, struct notify_change_buf))) {
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DEBUG(0, ("talloc failed\n"));
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return NT_STATUS_NO_MEMORY;
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}
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fsp_fullbasepath(fsp, fullpath, sizeof(fullpath));
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/*
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* Avoid /. at the end of the path name. notify can't deal with it.
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*/
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if (len > 1 && fullpath[len-1] == '.' && fullpath[len-2] == '/') {
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fullpath[len-2] = '\0';
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}
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subdir_filter = recursive ? filter : 0;
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if ((filter != 0) || (subdir_filter != 0)) {
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status = notify_add(fsp->conn->sconn->notify_ctx,
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fullpath, filter, subdir_filter,
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notify_callback, fsp);
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}
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return status;
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}
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NTSTATUS change_notify_add_request(struct smb_request *req,
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uint32_t max_param,
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uint32_t filter, bool recursive,
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struct files_struct *fsp,
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void (*reply_fn)(struct smb_request *req,
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NTSTATUS error_code,
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uint8_t *buf, size_t len))
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{
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struct notify_change_request *request = NULL;
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struct notify_mid_map *map = NULL;
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struct smbd_server_connection *sconn = req->sconn;
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DEBUG(10, ("change_notify_add_request: Adding request for %s: "
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"max_param = %d\n", fsp_str_dbg(fsp), (int)max_param));
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if (!(request = talloc(NULL, struct notify_change_request))
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|| !(map = talloc(request, struct notify_mid_map))) {
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TALLOC_FREE(request);
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return NT_STATUS_NO_MEMORY;
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}
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request->mid_map = map;
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map->req = request;
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request->req = talloc_move(request, &req);
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request->max_param = max_param;
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request->filter = filter;
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request->fsp = fsp;
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request->reply_fn = reply_fn;
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request->backend_data = NULL;
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DLIST_ADD_END(fsp->notify->requests, request);
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map->mid = request->req->mid;
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DLIST_ADD(sconn->smb1.notify_mid_maps, map);
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return NT_STATUS_OK;
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}
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static void change_notify_remove_request(struct smbd_server_connection *sconn,
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struct notify_change_request *remove_req)
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{
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files_struct *fsp;
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struct notify_change_request *req;
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/*
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* Paranoia checks, the fsp referenced must must have the request in
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* its list of pending requests
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*/
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fsp = remove_req->fsp;
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SMB_ASSERT(fsp->notify != NULL);
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for (req = fsp->notify->requests; req; req = req->next) {
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if (req == remove_req) {
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break;
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}
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}
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if (req == NULL) {
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smb_panic("notify_req not found in fsp's requests");
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}
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DLIST_REMOVE(fsp->notify->requests, req);
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DLIST_REMOVE(sconn->smb1.notify_mid_maps, req->mid_map);
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TALLOC_FREE(req);
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}
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static void smbd_notify_cancel_by_map(struct notify_mid_map *map)
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{
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struct smb_request *smbreq = map->req->req;
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struct smbd_server_connection *sconn = smbreq->sconn;
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struct smbd_smb2_request *smb2req = smbreq->smb2req;
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NTSTATUS notify_status = NT_STATUS_CANCELLED;
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if (smb2req != NULL) {
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if (smb2req->session == NULL) {
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notify_status = STATUS_NOTIFY_CLEANUP;
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} else if (!NT_STATUS_IS_OK(smb2req->session->status)) {
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notify_status = STATUS_NOTIFY_CLEANUP;
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}
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if (smb2req->tcon == NULL) {
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notify_status = STATUS_NOTIFY_CLEANUP;
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} else if (!NT_STATUS_IS_OK(smb2req->tcon->status)) {
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notify_status = STATUS_NOTIFY_CLEANUP;
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}
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}
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change_notify_reply(smbreq, notify_status,
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0, NULL, map->req->reply_fn);
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change_notify_remove_request(sconn, map->req);
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}
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/****************************************************************************
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Delete entries by mid from the change notify pending queue. Always send reply.
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*****************************************************************************/
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void remove_pending_change_notify_requests_by_mid(
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struct smbd_server_connection *sconn, uint64_t mid)
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{
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struct notify_mid_map *map;
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for (map = sconn->smb1.notify_mid_maps; map; map = map->next) {
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if (map->mid == mid) {
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break;
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}
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}
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if (map == NULL) {
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return;
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}
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smbd_notify_cancel_by_map(map);
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}
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void smbd_notify_cancel_by_smbreq(const struct smb_request *smbreq)
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{
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struct smbd_server_connection *sconn = smbreq->sconn;
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struct notify_mid_map *map;
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for (map = sconn->smb1.notify_mid_maps; map; map = map->next) {
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if (map->req->req == smbreq) {
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break;
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}
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}
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if (map == NULL) {
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return;
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}
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smbd_notify_cancel_by_map(map);
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}
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static struct files_struct *smbd_notify_cancel_deleted_fn(
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struct files_struct *fsp, void *private_data)
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{
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struct file_id *fid = talloc_get_type_abort(
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private_data, struct file_id);
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if (file_id_equal(&fsp->file_id, fid)) {
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remove_pending_change_notify_requests_by_fid(
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fsp, NT_STATUS_DELETE_PENDING);
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}
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return NULL;
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}
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void smbd_notify_cancel_deleted(struct messaging_context *msg,
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void *private_data, uint32_t msg_type,
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struct server_id server_id, DATA_BLOB *data)
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{
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struct smbd_server_connection *sconn = talloc_get_type_abort(
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private_data, struct smbd_server_connection);
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struct file_id *fid;
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enum ndr_err_code ndr_err;
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fid = talloc(talloc_tos(), struct file_id);
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if (fid == NULL) {
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DEBUG(1, ("talloc failed\n"));
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return;
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}
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ndr_err = ndr_pull_struct_blob_all(
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data, fid, fid, (ndr_pull_flags_fn_t)ndr_pull_file_id);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(10, ("%s: ndr_pull_file_id failed: %s\n", __func__,
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ndr_errstr(ndr_err)));
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goto done;
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}
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files_forall(sconn, smbd_notify_cancel_deleted_fn, fid);
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done:
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TALLOC_FREE(fid);
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}
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/****************************************************************************
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Delete entries by fnum from the change notify pending queue.
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*****************************************************************************/
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void remove_pending_change_notify_requests_by_fid(files_struct *fsp,
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NTSTATUS status)
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{
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if (fsp->notify == NULL) {
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return;
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}
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while (fsp->notify->requests != NULL) {
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change_notify_reply(fsp->notify->requests->req,
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status, 0, NULL,
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fsp->notify->requests->reply_fn);
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change_notify_remove_request(fsp->conn->sconn,
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fsp->notify->requests);
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}
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}
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void notify_fname(connection_struct *conn, uint32_t action, uint32_t filter,
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const char *path)
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{
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struct notify_context *notify_ctx = conn->sconn->notify_ctx;
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if (path[0] == '.' && path[1] == '/') {
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path += 2;
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}
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notify_trigger(notify_ctx, action, filter, conn->connectpath, path);
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}
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static void notify_fsp(files_struct *fsp, struct timespec when,
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uint32_t action, const char *name)
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{
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struct notify_change_event *change, *changes;
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char *tmp;
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if (fsp->notify == NULL) {
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/*
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* Nobody is waiting, don't queue
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*/
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return;
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}
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/*
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* Someone has triggered a notify previously, queue the change for
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* later.
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*/
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if ((fsp->notify->num_changes > 1000) || (name == NULL)) {
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/*
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* The real number depends on the client buf, just provide a
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* guard against a DoS here. If name == NULL the CN backend is
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* alerting us to a problem. Possibly dropped events. Clear
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* queued changes and send the catch-all response to the client
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* if a request is pending.
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*/
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TALLOC_FREE(fsp->notify->changes);
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fsp->notify->num_changes = -1;
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if (fsp->notify->requests != NULL) {
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change_notify_reply(fsp->notify->requests->req,
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NT_STATUS_OK,
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fsp->notify->requests->max_param,
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fsp->notify,
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fsp->notify->requests->reply_fn);
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change_notify_remove_request(fsp->conn->sconn,
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fsp->notify->requests);
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}
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return;
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|
}
|
|
|
|
/* If we've exceeded the server side queue or received a NULL name
|
|
* from the underlying CN implementation, don't queue up any more
|
|
* requests until we can send a catch-all response to the client */
|
|
if (fsp->notify->num_changes == -1) {
|
|
return;
|
|
}
|
|
|
|
if (!(changes = talloc_realloc(
|
|
fsp->notify, fsp->notify->changes,
|
|
struct notify_change_event,
|
|
fsp->notify->num_changes+1))) {
|
|
DEBUG(0, ("talloc_realloc failed\n"));
|
|
return;
|
|
}
|
|
|
|
fsp->notify->changes = changes;
|
|
|
|
change = &(fsp->notify->changes[fsp->notify->num_changes]);
|
|
|
|
if (!(tmp = talloc_strdup(changes, name))) {
|
|
DEBUG(0, ("talloc_strdup failed\n"));
|
|
return;
|
|
}
|
|
|
|
string_replace(tmp, '/', '\\');
|
|
change->name = tmp;
|
|
|
|
change->when = when;
|
|
change->action = action;
|
|
fsp->notify->num_changes += 1;
|
|
|
|
if (fsp->notify->requests == NULL) {
|
|
/*
|
|
* Nobody is waiting, so don't send anything. The ot
|
|
*/
|
|
return;
|
|
}
|
|
|
|
if (action == NOTIFY_ACTION_OLD_NAME) {
|
|
/*
|
|
* We have to send the two rename events in one reply. So hold
|
|
* the first part back.
|
|
*/
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Someone is waiting for the change, trigger the reply immediately.
|
|
*
|
|
* TODO: do we have to walk the lists of requests pending?
|
|
*/
|
|
|
|
change_notify_reply(fsp->notify->requests->req,
|
|
NT_STATUS_OK,
|
|
fsp->notify->requests->max_param,
|
|
fsp->notify,
|
|
fsp->notify->requests->reply_fn);
|
|
|
|
change_notify_remove_request(fsp->conn->sconn, fsp->notify->requests);
|
|
}
|
|
|
|
char *notify_filter_string(TALLOC_CTX *mem_ctx, uint32_t filter)
|
|
{
|
|
char *result = NULL;
|
|
|
|
result = talloc_strdup(mem_ctx, "");
|
|
|
|
if (filter & FILE_NOTIFY_CHANGE_FILE_NAME)
|
|
result = talloc_asprintf_append(result, "FILE_NAME|");
|
|
if (filter & FILE_NOTIFY_CHANGE_DIR_NAME)
|
|
result = talloc_asprintf_append(result, "DIR_NAME|");
|
|
if (filter & FILE_NOTIFY_CHANGE_ATTRIBUTES)
|
|
result = talloc_asprintf_append(result, "ATTRIBUTES|");
|
|
if (filter & FILE_NOTIFY_CHANGE_SIZE)
|
|
result = talloc_asprintf_append(result, "SIZE|");
|
|
if (filter & FILE_NOTIFY_CHANGE_LAST_WRITE)
|
|
result = talloc_asprintf_append(result, "LAST_WRITE|");
|
|
if (filter & FILE_NOTIFY_CHANGE_LAST_ACCESS)
|
|
result = talloc_asprintf_append(result, "LAST_ACCESS|");
|
|
if (filter & FILE_NOTIFY_CHANGE_CREATION)
|
|
result = talloc_asprintf_append(result, "CREATION|");
|
|
if (filter & FILE_NOTIFY_CHANGE_EA)
|
|
result = talloc_asprintf_append(result, "EA|");
|
|
if (filter & FILE_NOTIFY_CHANGE_SECURITY)
|
|
result = talloc_asprintf_append(result, "SECURITY|");
|
|
if (filter & FILE_NOTIFY_CHANGE_STREAM_NAME)
|
|
result = talloc_asprintf_append(result, "STREAM_NAME|");
|
|
if (filter & FILE_NOTIFY_CHANGE_STREAM_SIZE)
|
|
result = talloc_asprintf_append(result, "STREAM_SIZE|");
|
|
if (filter & FILE_NOTIFY_CHANGE_STREAM_WRITE)
|
|
result = talloc_asprintf_append(result, "STREAM_WRITE|");
|
|
|
|
if (result == NULL) return NULL;
|
|
if (*result == '\0') return result;
|
|
|
|
result[strlen(result)-1] = '\0';
|
|
return result;
|
|
}
|
|
|
|
struct sys_notify_context *sys_notify_context_create(TALLOC_CTX *mem_ctx,
|
|
struct tevent_context *ev)
|
|
{
|
|
struct sys_notify_context *ctx;
|
|
|
|
if (!(ctx = talloc(mem_ctx, struct sys_notify_context))) {
|
|
DEBUG(0, ("talloc failed\n"));
|
|
return NULL;
|
|
}
|
|
|
|
ctx->ev = ev;
|
|
ctx->private_data = NULL;
|
|
return ctx;
|
|
}
|