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/*
* Copyright (c) 2002-2018 Balabit
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, 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, 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 "hook-commands.h"
#include "apphook.h"
#include <stdlib.h>
#define HOOK_COMMANDS_PLUGIN "hook-commands"
struct _HookCommandsPlugin
{
LogDriverPlugin super;
gchar *startup;
gchar *setup;
gchar *teardown;
gchar *shutdown;
gboolean (*saved_init)(LogPipe *s);
gboolean (*saved_deinit)(LogPipe *s);
};
void
hook_commands_plugin_set_startup(HookCommandsPlugin *self, const gchar *startup)
{
g_free(self->startup);
self->startup = g_strdup(startup);
}
void
hook_commands_plugin_set_setup(HookCommandsPlugin *self, const gchar *setup)
{
g_free(self->setup);
self->setup = g_strdup(setup);
}
void
hook_commands_plugin_set_teardown(HookCommandsPlugin *self, const gchar *teardown)
{
g_free(self->teardown);
self->teardown = g_strdup(teardown);
}
void
hook_commands_plugin_set_shutdown(HookCommandsPlugin *self, const gchar *shutdown_)
{
g_free(self->shutdown);
self->shutdown = g_strdup(shutdown_);
}
static gboolean
_run_hook(LogDriver *driver, const gchar *hook, const gchar *cmd)
{
gint rc;
if (!cmd)
return TRUE;
msg_debug("About to execute a hook command",
evt_tag_str("driver", driver->id),
log_pipe_location_tag(&driver->super),
evt_tag_str("hook", hook),
evt_tag_str("command", cmd));
rc = system(cmd);
if (rc != 0)
{
msg_error("Hook command returned with failure, aborting initialization",
evt_tag_str("driver", driver->id),
log_pipe_location_tag(&driver->super),
evt_tag_str("hook", hook),
evt_tag_str("command", cmd),
evt_tag_int("rc", rc));
}
return rc == 0;
}
/* this is running in the context of the LogDriver, e.g. LogPipe *s points
* to the driver we were plugged into */
static gboolean
_init_hook(LogPipe *s)
{
LogDriver *driver = (LogDriver *) s;
HookCommandsPlugin *self = log_driver_get_plugin(driver, HookCommandsPlugin, HOOK_COMMANDS_PLUGIN);
if (app_is_starting_up() && !_run_hook(driver, "startup", self->startup))
return FALSE;
if (!_run_hook(driver, "setup", self->setup))
return FALSE;
return self->saved_init(s);
}
static gboolean
_deinit_hook(LogPipe *s)
{
LogDriver *driver = (LogDriver *) s;
HookCommandsPlugin *self = log_driver_get_plugin(driver, HookCommandsPlugin, HOOK_COMMANDS_PLUGIN);
_run_hook(driver, "teardown", self->teardown);
if (app_is_shutting_down())
_run_hook(driver, "shutdown", self->shutdown);
/* NOTE: we call deinit() even if teardown failed, there's not much we can
* do apart from reporting the failure, which we already did in
* _run_hook()
* */
return self->saved_deinit(s);
}
static gboolean
_attach(LogDriverPlugin *s, LogDriver *driver)
{
HookCommandsPlugin *self = (HookCommandsPlugin *) s;
self->saved_init = driver->super.init;
driver->super.init = _init_hook;
self->saved_deinit = driver->super.deinit;
driver->super.deinit = _deinit_hook;
return TRUE;
}
static void
_free(LogDriverPlugin *s)
{
HookCommandsPlugin *self = (HookCommandsPlugin *) s;
g_free(self->setup);
g_free(self->teardown);
log_driver_plugin_free_method(s);
}
HookCommandsPlugin *
hook_commands_plugin_new(void)
{
HookCommandsPlugin *self = g_new0(HookCommandsPlugin, 1);
log_driver_plugin_init_instance(&self->super, HOOK_COMMANDS_PLUGIN);
self->super.attach = _attach;
self->super.free_fn = _free;
return self;
}
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