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/*
* Copyright (c) 2002-2013 Balabit
* Copyright (c) 2021 Balazs Scheidler <bazsi77@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "control-command-thread.h"
#include "control-connection.h"
#include "control-server.h"
#include "messages.h"
#include "secret-storage/secret-storage.h"
#include "scratch-buffers.h"
#include <iv_event.h>
struct _ControlCommandThread
{
GAtomicCounter ref_cnt;
ControlConnection *connection;
GString *command;
gpointer user_data;
GThread *thread;
GMutex state_lock;
gboolean cancelled;
gboolean finished;
ControlCommandFunc func;
struct iv_event thread_finished;
};
static void
_on_thread_finished(gpointer user_data)
{
ControlCommandThread *self = (ControlCommandThread *) user_data;
g_thread_join(self->thread);
iv_event_unregister(&self->thread_finished);
control_server_worker_finished(self->connection->server, self);
/* drop ref belonging to the thread_finished event */
control_command_thread_unref(self);
}
static void
_thread(gpointer user_data)
{
ControlCommandThread *self = (ControlCommandThread *) user_data;
iv_init();
scratch_buffers_allocator_init();
msg_debug("Control command thread has started",
evt_tag_str("control_command", self->command->str));
self->func(self->connection, self->command, self->user_data, &self->cancelled);
g_mutex_lock(&self->state_lock);
{
self->finished = TRUE;
if (!self->cancelled)
iv_event_post(&self->thread_finished);
}
g_mutex_unlock(&self->state_lock);
/* drop ref belonging to the thread function */
msg_debug("Control command thread is exiting now",
evt_tag_str("control_command", self->command->str));
scratch_buffers_explicit_gc();
scratch_buffers_allocator_deinit();
control_command_thread_unref(self);
iv_deinit();
}
const gchar *
control_command_thread_get_command(ControlCommandThread *self)
{
return self->command->str;
}
void
control_command_thread_run(ControlCommandThread *self)
{
self->thread_finished.cookie = control_command_thread_ref(self);
iv_event_register(&self->thread_finished);
control_server_worker_started(self->connection->server, self);
self->thread = g_thread_new(self->command->str, (GThreadFunc) _thread, control_command_thread_ref(self));
}
void
control_command_thread_cancel(ControlCommandThread *self)
{
gboolean has_to_join = FALSE;
g_mutex_lock(&self->state_lock);
{
self->cancelled = TRUE;
if (!self->finished)
{
has_to_join = TRUE;
}
}
g_mutex_unlock(&self->state_lock);
if (has_to_join)
g_thread_join(self->thread);
}
ControlCommandThread *
control_command_thread_new(ControlConnection *cc, GString *cmd, ControlCommandFunc func, gpointer user_data)
{
ControlCommandThread *self = g_new0(ControlCommandThread, 1);
g_atomic_counter_set(&self->ref_cnt, 1);
self->connection = control_connection_ref(cc);
self->command = g_string_new(cmd->str);
self->func = func;
self->user_data = user_data;
g_mutex_init(&self->state_lock);
IV_EVENT_INIT(&self->thread_finished);
self->thread_finished.handler = _on_thread_finished;
return self;
}
static void
_control_command_thread_free(ControlCommandThread *self)
{
g_mutex_clear(&self->state_lock);
secret_storage_wipe(self->command->str, self->command->len);
g_string_free(self->command, TRUE);
control_connection_unref(self->connection);
g_free(self);
}
ControlCommandThread *
control_command_thread_ref(ControlCommandThread *self)
{
g_assert(!self || g_atomic_counter_get(&self->ref_cnt) > 0);
if (self)
g_atomic_counter_inc(&self->ref_cnt);
return self;
}
void
control_command_thread_unref(ControlCommandThread *self)
{
g_assert(!self || g_atomic_counter_get(&self->ref_cnt));
if (self && (g_atomic_counter_dec_and_test(&self->ref_cnt)))
_control_command_thread_free(self);
}
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