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/*
* Unix SMB/CIFS implementation.
*
* Copyright (C) Volker Lendecke 2014
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "librpc/gen_ndr/notify.h"
#include "librpc/gen_ndr/messaging.h"
#include "lib/dbwrap/dbwrap.h"
#include "lib/dbwrap/dbwrap_rbt.h"
#include "lib/util/server_id.h"
#include "messages.h"
#include "proto.h"
#include "globals.h"
#include "tdb.h"
#include "util_tdb.h"
#include "lib/util/server_id_db.h"
#include "smbd/notifyd/notifyd.h"
struct notify_context {
struct server_id notifyd;
struct messaging_context *msg_ctx;
struct smbd_server_connection *sconn;
void (*callback)(struct smbd_server_connection *sconn,
void *private_data, struct timespec when,
const struct notify_event *ctx);
};
static void notify_handler(struct messaging_context *msg, void *private_data,
uint32_t msg_type, struct server_id src,
DATA_BLOB *data);
static int notify_context_destructor(struct notify_context *ctx);
struct notify_context *notify_init(
TALLOC_CTX *mem_ctx, struct messaging_context *msg,
struct smbd_server_connection *sconn,
void (*callback)(struct smbd_server_connection *sconn,
void *, struct timespec,
const struct notify_event *))
{
struct server_id_db *names_db;
struct notify_context *ctx;
NTSTATUS status;
ctx = talloc(mem_ctx, struct notify_context);
if (ctx == NULL) {
return NULL;
}
ctx->msg_ctx = msg;
ctx->sconn = sconn;
ctx->callback = callback;
names_db = messaging_names_db(msg);
if (!server_id_db_lookup_one(names_db, "notify-daemon",
&ctx->notifyd)) {
DBG_WARNING("No notify daemon around\n");
TALLOC_FREE(ctx);
return NULL;
}
{
struct server_id_buf tmp;
DBG_DEBUG("notifyd=%s\n",
server_id_str_buf(ctx->notifyd, &tmp));
}
if (callback != NULL) {
status = messaging_register(msg, ctx, MSG_PVFS_NOTIFY,
notify_handler);
if (!NT_STATUS_IS_OK(status)) {
DBG_WARNING("messaging_register failed: %s\n",
nt_errstr(status));
TALLOC_FREE(ctx);
return NULL;
}
}
talloc_set_destructor(ctx, notify_context_destructor);
return ctx;
}
static int notify_context_destructor(struct notify_context *ctx)
{
if (ctx->callback != NULL) {
messaging_deregister(ctx->msg_ctx, MSG_PVFS_NOTIFY, ctx);
}
return 0;
}
static void notify_handler(struct messaging_context *msg, void *private_data,
uint32_t msg_type, struct server_id src,
DATA_BLOB *data)
{
struct notify_context *ctx = talloc_get_type_abort(
private_data, struct notify_context);
struct notify_event_msg *event_msg;
struct notify_event event;
if (data->length < offsetof(struct notify_event_msg, path) + 1) {
DBG_WARNING("message too short: %zu\n", data->length);
return;
}
if (data->data[data->length-1] != 0) {
DBG_WARNING("path not 0-terminated\n");
return;
}
event_msg = (struct notify_event_msg *)data->data;
event.action = event_msg->action;
event.path = event_msg->path;
event.private_data = event_msg->private_data;
DBG_DEBUG("Got notify_event action=%"PRIu32", private_data=%p, "
"path=%s\n",
event.action,
event.private_data,
event.path);
ctx->callback(ctx->sconn, event.private_data, event_msg->when, &event);
}
NTSTATUS notify_add(struct notify_context *ctx,
const char *path, uint32_t filter, uint32_t subdir_filter,
void *private_data)
{
struct notify_rec_change_msg msg = {};
struct iovec iov[2];
size_t pathlen;
NTSTATUS status;
if (ctx == NULL) {
return NT_STATUS_NOT_IMPLEMENTED;
}
DBG_DEBUG("path=[%s], filter=%"PRIu32", subdir_filter=%"PRIu32", "
"private_data=%p\n",
path,
filter,
subdir_filter,
private_data);
pathlen = strlen(path)+1;
clock_gettime_mono(&msg.instance.creation_time);
msg.instance.filter = filter;
msg.instance.subdir_filter = subdir_filter;
msg.instance.private_data = private_data;
iov[0].iov_base = &msg;
iov[0].iov_len = offsetof(struct notify_rec_change_msg, path);
iov[1].iov_base = discard_const_p(char, path);
iov[1].iov_len = pathlen;
status = messaging_send_iov(
ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_REC_CHANGE,
iov, ARRAY_SIZE(iov), NULL, 0);
if (!NT_STATUS_IS_OK(status)) {
DBG_DEBUG("messaging_send_iov returned %s\n",
nt_errstr(status));
return status;
}
return NT_STATUS_OK;
}
NTSTATUS notify_remove(struct notify_context *ctx, void *private_data,
char *path)
{
struct notify_rec_change_msg msg = {};
struct iovec iov[2];
NTSTATUS status;
/* see if change notify is enabled at all */
if (ctx == NULL) {
return NT_STATUS_NOT_IMPLEMENTED;
}
msg.instance.private_data = private_data;
iov[0].iov_base = &msg;
iov[0].iov_len = offsetof(struct notify_rec_change_msg, path);
iov[1].iov_base = path;
iov[1].iov_len = strlen(path)+1;
status = messaging_send_iov(
ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_REC_CHANGE,
iov, ARRAY_SIZE(iov), NULL, 0);
return status;
}
void notify_trigger(struct notify_context *ctx,
uint32_t action, uint32_t filter,
const char *dir, const char *name)
{
struct notify_trigger_msg msg;
struct iovec iov[4];
char slash = '/';
DBG_DEBUG("notify_trigger called action=0x%"PRIx32", "
"filter=0x%"PRIx32", dir=%s, name=%s\n",
action,
filter,
dir,
name);
if (ctx == NULL) {
return;
}
msg.when = timespec_current();
msg.action = action;
msg.filter = filter;
iov[0].iov_base = &msg;
iov[0].iov_len = offsetof(struct notify_trigger_msg, path);
iov[1].iov_base = discard_const_p(char, dir);
iov[1].iov_len = strlen(dir);
iov[2].iov_base = &slash;
iov[2].iov_len = 1;
iov[3].iov_base = discard_const_p(char, name);
iov[3].iov_len = strlen(name)+1;
messaging_send_iov(
ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_TRIGGER,
iov, ARRAY_SIZE(iov), NULL, 0);
}
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