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/* SPDX-License-Identifier: GPL-2.0 */
#include <string.h>
#include <stdlib.h>
#include <systemd/sd-bus.h>
#include <errno.h>
#include "utils.h"
#include "config-parser.h"
#include "systemd.h"
#include "config.h"
static sd_bus *bus = NULL;
static bool bus_failed = false;
void systemd_delete()
{
assert_return_silent(bus);
sd_bus_unref(bus);
bus = NULL;
bus_failed = false;
}
static sd_bus *get_bus()
{
int r;
if (bus_failed)
return NULL;
if (!bus) {
r = sd_bus_open_user(&bus);
if (r < 0) {
error("failed to connect to user system bus: %s",
strerror(-r));
bus_failed = true;
return NULL;
}
}
return bus;
}
/*
* Check if a systemd service is running.
*
* This is equivalent to (assuming service mc@world1):
* gdbus call --session
* --dest org.freedesktop.systemd1
* --object-path /org/freedesktop/systemd1/unit/mc_40world1_2eservice
* --method org.freedesktop.DBus.Properties.Get
* "org.freedesktop.systemd1.Unit"
* "ActiveState"
*/
bool systemd_service_running(struct server_config *scfg, const char **error)
{
sd_bus *bus = get_bus();
sd_bus_error sderror = SD_BUS_ERROR_NULL;
char *status = NULL;
bool running = false;
int r;
assert_return(bus && error && scfg && scfg->systemd_service &&
scfg->systemd_obj, false);
again:
r = sd_bus_get_property_string(bus, SYSTEMD_DBUS_SERVICE,
scfg->systemd_obj,
SYSTEMD_DBUS_INTERFACE, "ActiveState",
&sderror, &status);
if (r < 0) {
if (sd_bus_error_get_errno(&sderror) == EINTR)
goto again;
debug(DBG_SYSD, "failed to get status for server %s (%s): %s",
scfg->systemd_service, scfg->systemd_obj, sderror.message);
*error = "failed to get service status";
} else if (streq(status, "active")) {
running = true;
debug(DBG_SYSD, "systemd service %s (%s) is active",
scfg->systemd_service, scfg->systemd_obj);
} else {
debug(DBG_SYSD, "systemd service %s (%s) is not active (%s)",
scfg->systemd_service, scfg->systemd_obj, status);
*error = "service not active";
}
free(status);
sd_bus_error_free(&sderror);
return running;
}
static bool systemd_service_action(struct server_config *scfg,
const char *action)
{
sd_bus_error error = SD_BUS_ERROR_NULL;
sd_bus_message *m = NULL;
sd_bus *bus = get_bus();
const char *path;
bool performed = false;
int r;
assert_return(bus && scfg && scfg->systemd_service &&
scfg->systemd_obj && action, false);
again:
r = sd_bus_call_method(bus, SYSTEMD_DBUS_SERVICE, scfg->systemd_obj,
SYSTEMD_DBUS_INTERFACE, action, &error, &m, "s",
"fail");
if (r < 0) {
if (sd_bus_error_get_errno(&error) == EINTR)
goto again;
error("failed to perform action %s on systemd service %s: %s",
action, scfg->systemd_service, error.message);
goto out;
}
r = sd_bus_message_read(m, "o", &path);
if (r < 0) {
error("failed to parse response message: %s", strerror(-r));
goto out;
}
verbose("action %s queued for service %s", action,
scfg->systemd_service);
performed = true;
out:
sd_bus_error_free(&error);
sd_bus_message_unref(m);
return performed;
}
/*
* Stop systemd service.
*
* This is equivalent to (assuming service mc@world1):
* gdbus call --session
* --dest org.freedesktop.systemd1
* --object-path /org/freedesktop/systemd1/unit/mc_40world1_2eservice
* --method org.freedesktop.systemd1.Unit.Stop "fail"
*/
bool systemd_service_stop(struct server_config *scfg)
{
assert_return(scfg, false);
return systemd_service_action(scfg, "Stop");
}
/*
* Start systemd service.
*
* This is equivalent to (assuming service mc@world1):
* gdbus call --session
* --dest org.freedesktop.systemd1
* --object-path /org/freedesktop/systemd1/unit/mc_40world1_2eservice
* --method org.freedesktop.systemd1.Unit.Start "fail"
*/
bool systemd_service_start(struct server_config *scfg)
{
assert_return(scfg, false);
return systemd_service_action(scfg, "Start");
}
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