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#include <string.h>
#include <stdlib.h>
#include <systemd/sd-bus.h>
#include "main.h"
#include "server.h"
#include "systemd.h"
#define SYSTEMD_DBUS_SERVICE "org.freedesktop.systemd1"
#define SYSTEMD_DBUS_INTERFACE "org.freedesktop.systemd1.Unit"
#define SYSTEMD_DBUS_PATH_PREFIX "/org/freedesktop/systemd1/unit/"
static inline char
tohex(uint8_t val)
{
static const char hex[] = "0123456789abcdef";
return hex[val & 0x0f];
}
/*
* Creates an escaped D-Bus object path for a given systemd service
*
* Escaping rules are documented here:
* https://dbus.freedesktop.org/doc/dbus-specification.html
*
* Essentially, everyting but a-z, A-Z, 0-9 is replaced by _xx where xx is
* the hexadecimal value of the character.
*
* Example: minecraft@world1.service -> minecraft_40world1_2eservice
*/
char *
systemd_object_path(const char *service)
{
char *r;
char *d;
const char *s;
assert_return(service && !empty_str(service), NULL);
r = zmalloc(strlen(SYSTEMD_DBUS_PATH_PREFIX) + strlen(service) * 3 + 1);
if (!r)
return NULL;
memcpy(r, SYSTEMD_DBUS_PATH_PREFIX, strlen(SYSTEMD_DBUS_PATH_PREFIX));
d = r + strlen(SYSTEMD_DBUS_PATH_PREFIX);
for (s = service; *s; s++) {
if ((*s >= 'a' && *s <= 'z') ||
(*s >= 'A' && *s <= 'Z') ||
(*s >= '0' && *s <= '9')) {
*(d++) = *s;
continue;
}
*(d++) = '_';
*(d++) = tohex(*s >> 4);
*(d++) = tohex(*s);
}
*d = '\0';
return r;
}
void
systemd_delete()
{
assert_return_silent(cfg->sd_bus);
sd_bus_unref(cfg->sd_bus);
cfg->sd_bus = NULL;
}
static sd_bus *
get_bus()
{
int r;
if (cfg->sd_bus_failed)
return NULL;
if (!cfg->sd_bus) {
r = sd_bus_open_user(&cfg->sd_bus);
if (r < 0) {
error("failed to connect to user system bus: %s", strerror(-r));
cfg->sd_bus_failed = true;
return NULL;
}
}
return cfg->sd_bus;
}
/*
* Check if a systemd service is running.
*
* This is equivalent to (assuming service minecraft@world1):
* gdbus call --session
* --dest org.freedesktop.systemd1
* --object-path /org/freedesktop/systemd1/unit/minecraft_40world1_2eservice
* --method org.freedesktop.DBus.Properties.Get
* "org.freedesktop.systemd1.Unit"
* "ActiveState"
*/
bool
systemd_service_running(struct server *server)
{
sd_bus *bus = get_bus();
sd_bus_error error = SD_BUS_ERROR_NULL;
char *status = NULL;
bool running = false;
int r;
assert_return(server && bus && server->systemd_service && server->systemd_obj, false);
r = sd_bus_get_property_string(bus,
SYSTEMD_DBUS_SERVICE,
server->systemd_obj,
SYSTEMD_DBUS_INTERFACE,
"ActiveState",
&error,
&status);
if (r < 0) {
error("failed to get status for service %s (%s): %s",
server->systemd_service, server->systemd_obj, error.message);
goto out;
}
if (streq(status, "active")) {
running = true;
debug(DBG_SYSD, "systemd service %s (%s) is active",
server->systemd_service, server->systemd_obj);
} else
debug(DBG_SYSD, "systemd service %s (%s) is not active",
server->systemd_service, server->systemd_obj);
out:
free(status);
sd_bus_error_free(&error);
return running;
}
static bool
systemd_service_action(struct server *server, 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(server && bus && server->systemd_service && server->systemd_obj && action, false);
r = sd_bus_call_method(bus,
SYSTEMD_DBUS_SERVICE,
server->systemd_obj,
SYSTEMD_DBUS_INTERFACE,
action,
&error,
&m,
"s",
"fail");
if (r < 0) {
error("failed to perform action %s on systemd service %s: %s",
action, server->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, server->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 minecraft@world1):
* gdbus call --session
* --dest org.freedesktop.systemd1
* --object-path /org/freedesktop/systemd1/unit/minecraft_40world1_2eservice
* --method org.freedesktop.systemd1.Unit.Stop "fail"
*/
bool
systemd_service_stop(struct server *server)
{
assert_return(server, false);
return systemd_service_action(server, "Stop");
}
/*
* Start systemd service.
*
* This is equivalent to (assuming service minecraft@world1):
* gdbus call --session
* --dest org.freedesktop.systemd1
* --object-path /org/freedesktop/systemd1/unit/minecraft_40world1_2eservice
* --method org.freedesktop.systemd1.Unit.Start "fail"
*/
bool
systemd_service_start(struct server *server)
{
assert_return(server, false);
return systemd_service_action(server, "Start");
}
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