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https://github.com/samba-team/samba.git
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16a1418f3a
We have all information that was kept in "notify_list" in other parts of smbd as well. The only possible downside of this patch is that we possibly have a lot more fsp's than fsp's with notifies, so notify_callback() might be a bit slower in this situation. If this turns out to be a problem, I'd rather put some more smarts into the notifyd protocol to enable a better indexed notify_callback(). For now, this avoids data to be kept in two places. Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
290 lines
7.5 KiB
C
290 lines
7.5 KiB
C
/*
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* Unix SMB/CIFS implementation.
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*
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* Copyright (C) Volker Lendecke 2014
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*
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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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*
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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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*
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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 "librpc/gen_ndr/notify.h"
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#include "librpc/gen_ndr/messaging.h"
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#include "lib/dbwrap/dbwrap.h"
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#include "lib/dbwrap/dbwrap_rbt.h"
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#include "messages.h"
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#include "proto.h"
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#include "globals.h"
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#include "tdb.h"
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#include "util_tdb.h"
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#include "lib/util/server_id_db.h"
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#include "smbd/notifyd/notifyd.h"
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struct notify_context {
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struct server_id notifyd;
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struct messaging_context *msg_ctx;
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struct smbd_server_connection *sconn;
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void (*callback)(struct smbd_server_connection *sconn,
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void *private_data, struct timespec when,
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const struct notify_event *ctx);
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};
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static void notify_handler(struct messaging_context *msg, void *private_data,
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uint32_t msg_type, struct server_id src,
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DATA_BLOB *data);
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struct notify_context *notify_init(
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TALLOC_CTX *mem_ctx, struct messaging_context *msg,
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struct tevent_context *ev,
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struct smbd_server_connection *sconn,
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void (*callback)(struct smbd_server_connection *sconn,
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void *, struct timespec,
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const struct notify_event *))
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{
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struct server_id_db *names_db;
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struct notify_context *ctx;
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NTSTATUS status;
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ctx = talloc(mem_ctx, struct notify_context);
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if (ctx == NULL) {
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return NULL;
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}
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ctx->msg_ctx = msg;
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ctx->sconn = sconn;
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ctx->callback = callback;
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names_db = messaging_names_db(msg);
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if (!server_id_db_lookup_one(names_db, "notify-daemon",
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&ctx->notifyd)) {
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DEBUG(1, ("No notify daemon around\n"));
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TALLOC_FREE(ctx);
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return NULL;
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}
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if (callback != NULL) {
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status = messaging_register(msg, ctx, MSG_PVFS_NOTIFY,
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notify_handler);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("messaging_register failed: %s\n",
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nt_errstr(status)));
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TALLOC_FREE(ctx);
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return NULL;
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}
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}
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return ctx;
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}
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static void notify_handler(struct messaging_context *msg, void *private_data,
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uint32_t msg_type, struct server_id src,
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DATA_BLOB *data)
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{
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struct notify_context *ctx = talloc_get_type_abort(
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private_data, struct notify_context);
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struct notify_event_msg *event_msg;
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struct notify_event event;
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if (data->length < offsetof(struct notify_event_msg, path) + 1) {
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DEBUG(1, ("message too short: %u\n", (unsigned)data->length));
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return;
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}
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if (data->data[data->length-1] != 0) {
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DEBUG(1, ("%s: path not 0-terminated\n", __func__));
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return;
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}
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event_msg = (struct notify_event_msg *)data->data;
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event.action = event_msg->action;
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event.path = event_msg->path;
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event.private_data = event_msg->private_data;
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DEBUG(10, ("%s: Got notify_event action=%u, private_data=%p, "
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"path=%s\n", __func__, (unsigned)event.action,
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event.private_data, event.path));
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ctx->callback(ctx->sconn, event.private_data, event_msg->when, &event);
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}
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NTSTATUS notify_add(struct notify_context *ctx,
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const char *path, uint32_t filter, uint32_t subdir_filter,
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void *private_data)
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{
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struct notify_rec_change_msg msg = {};
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struct iovec iov[2];
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size_t pathlen;
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NTSTATUS status;
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if (ctx == NULL) {
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return NT_STATUS_NOT_IMPLEMENTED;
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}
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DEBUG(10, ("%s: path=[%s], filter=%u, subdir_filter=%u, "
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"private_data=%p\n", __func__, path, (unsigned)filter,
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(unsigned)subdir_filter, private_data));
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pathlen = strlen(path)+1;
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clock_gettime_mono(&msg.instance.creation_time);
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msg.instance.filter = filter;
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msg.instance.subdir_filter = subdir_filter;
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msg.instance.private_data = private_data;
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iov[0].iov_base = &msg;
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iov[0].iov_len = offsetof(struct notify_rec_change_msg, path);
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iov[1].iov_base = discard_const_p(char, path);
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iov[1].iov_len = pathlen;
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status = messaging_send_iov(
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ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_REC_CHANGE,
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iov, ARRAY_SIZE(iov), NULL, 0);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("messaging_send_iov returned %s\n",
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nt_errstr(status)));
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return status;
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}
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return NT_STATUS_OK;
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}
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NTSTATUS notify_remove(struct notify_context *ctx, void *private_data,
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char *path)
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{
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struct notify_rec_change_msg msg = {};
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struct iovec iov[2];
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NTSTATUS status;
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/* see if change notify is enabled at all */
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if (ctx == NULL) {
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return NT_STATUS_NOT_IMPLEMENTED;
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}
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msg.instance.private_data = private_data;
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iov[0].iov_base = &msg;
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iov[0].iov_len = offsetof(struct notify_rec_change_msg, path);
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iov[1].iov_base = path;
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iov[1].iov_len = strlen(path)+1;
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status = messaging_send_iov(
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ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_REC_CHANGE,
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iov, ARRAY_SIZE(iov), NULL, 0);
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return status;
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}
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void notify_trigger(struct notify_context *ctx,
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uint32_t action, uint32_t filter,
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const char *dir, const char *name)
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{
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struct notify_trigger_msg msg;
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struct iovec iov[4];
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char slash = '/';
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DEBUG(10, ("notify_trigger called action=0x%x, filter=0x%x, "
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"dir=%s, name=%s\n", (unsigned)action, (unsigned)filter,
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dir, name));
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if (ctx == NULL) {
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return;
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}
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msg.when = timespec_current();
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msg.action = action;
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msg.filter = filter;
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iov[0].iov_base = &msg;
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iov[0].iov_len = offsetof(struct notify_trigger_msg, path);
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iov[1].iov_base = discard_const_p(char, dir);
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iov[1].iov_len = strlen(dir);
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iov[2].iov_base = &slash;
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iov[2].iov_len = 1;
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iov[3].iov_base = discard_const_p(char, name);
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iov[3].iov_len = strlen(name)+1;
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messaging_send_iov(
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ctx->msg_ctx, ctx->notifyd, MSG_SMB_NOTIFY_TRIGGER,
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iov, ARRAY_SIZE(iov), NULL, 0);
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}
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NTSTATUS notify_walk(struct notify_context *notify,
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bool (*fn)(const char *path, struct server_id server,
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const struct notify_instance *instance,
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void *private_data),
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void *private_data)
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{
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struct tevent_context *ev;
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struct tevent_req *req;
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struct messaging_rec *rec;
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uint64_t log_idx;
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NTSTATUS status;
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int ret;
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bool ok;
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ev = samba_tevent_context_init(notify);
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if (ev == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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req = messaging_read_send(ev, ev, notify->msg_ctx, MSG_SMB_NOTIFY_DB);
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if (req == NULL) {
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TALLOC_FREE(ev);
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return NT_STATUS_NO_MEMORY;
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}
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ok = tevent_req_set_endtime(req, ev, timeval_current_ofs(10, 0));
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if (!ok) {
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TALLOC_FREE(ev);
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return NT_STATUS_NO_MEMORY;
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}
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status = messaging_send_buf(notify->msg_ctx, notify->notifyd,
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MSG_SMB_NOTIFY_GET_DB, NULL, 0);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("%s: messaging_send_buf failed\n",
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nt_errstr(status)));
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TALLOC_FREE(ev);
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return status;
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}
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ok = tevent_req_poll(req, ev);
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if (!ok) {
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DEBUG(10, ("%s: tevent_req_poll failed\n", __func__));
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TALLOC_FREE(ev);
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return NT_STATUS_INTERNAL_ERROR;
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}
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ret = messaging_read_recv(req, ev, &rec);
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if (ret != 0) {
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DEBUG(10, ("%s: messaging_read_recv failed: %s\n",
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__func__, strerror(ret)));
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TALLOC_FREE(ev);
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return map_nt_error_from_unix(ret);
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}
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ret = notifyd_parse_db(rec->buf.data, rec->buf.length, &log_idx,
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fn, private_data);
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if (ret != 0) {
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DEBUG(10, ("%s: notifyd_parse_db failed: %s\n",
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__func__, strerror(ret)));
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TALLOC_FREE(ev);
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return map_nt_error_from_unix(ret);
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}
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TALLOC_FREE(ev);
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return NT_STATUS_OK;
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}
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