From 90e27b4356f2a6ab98e812c4096b0b76f94a8fb3 Mon Sep 17 00:00:00 2001
From: David Härdeman <david@hardeman.nu>
Date: Tue, 7 Jul 2020 18:41:38 +0200
Subject: Flesh out the ping implementation

---
 minecctl/mc-commands.c   |  31 ++++-----
 minecctl/mc-commands.h   |   3 +-
 minecctl/misc-commands.c |  63 ++++++++++++++++--
 minecctl/misc-commands.h |   2 +
 minecctl/rcon-commands.c |  20 +++---
 minecctl/rcon-commands.h |   5 +-
 minecproxy/main.c        |   4 +-
 minecproxy/main.h        |   2 -
 minecproxy/meson.build   |   3 -
 minecproxy/server.c      |  12 ++--
 minecproxy/systemd.c     | 164 ----------------------------------------------
 minecproxy/systemd.h     |  13 ----
 shared/meson.build       |   4 ++
 shared/systemd.c         | 167 +++++++++++++++++++++++++++++++++++++++++++++++
 shared/systemd.h         |  13 ++++
 15 files changed, 277 insertions(+), 229 deletions(-)
 delete mode 100644 minecproxy/systemd.c
 delete mode 100644 minecproxy/systemd.h
 create mode 100644 shared/systemd.c
 create mode 100644 shared/systemd.h

diff --git a/minecctl/mc-commands.c b/minecctl/mc-commands.c
index 7d44451..c65f166 100644
--- a/minecctl/mc-commands.c
+++ b/minecctl/mc-commands.c
@@ -8,32 +8,23 @@
 #include "misc.h"
 #include "shared/mc-protocol.h"
 
-bool do_mc_pcount(struct cfg *cfg, unsigned *online, unsigned *max)
+bool do_mc_pcount(struct cfg *cfg, struct server *server, unsigned *online,
+		  unsigned *max, const char **error)
 {
-	struct server *server;
 	struct saddr *saddr;
-	const char *error;
 	char buf[4096];
 	size_t plen, off;
 	ssize_t r;
 	bool rv = false;
 	int fd;
 
-	server = server_get_default(cfg);
-	if (!server) {
-		error("failed to get default server");
-		return false;
-	}
-
 	fd = connect_any(&server->scfg.remotes, &saddr, &error);
-	if (fd < 0) {
-		error("%s: unable to connect - %s", server->name, error);
+	if (fd < 0)
 		return false;
-	}
 
 	if (!mc_protocol_create_status_request(buf, sizeof(buf), &plen,
 					       saddr)) {
-		error("Failed to create req");
+		*error = "failed to create request";
 		goto out;
 	}
 
@@ -42,7 +33,7 @@ bool do_mc_pcount(struct cfg *cfg, unsigned *online, unsigned *max)
 	while (off < plen) {
 		r = write(fd, buf + off, plen - off);
 		if (r <= 0) {
-			error("write failed: %zi (%m)", r);
+			*error = "write failed";
 			goto out;
 		}
 		off += r;
@@ -52,23 +43,23 @@ bool do_mc_pcount(struct cfg *cfg, unsigned *online, unsigned *max)
 	while (off < sizeof(buf)) {
 		r = read(fd, buf + off, sizeof(buf) - off);
 		if (r <= 0) {
-			error("Read failed %zi: %m", r);
+			*error = "read failed";
 			goto out;
 		}
 
 		off += r;
 
-		if (mc_is_handshake_complete(buf, off)) {
-			rv = true;
+		if (mc_is_handshake_complete(buf, off))
 			break;
-		}
 	}
 
 	if (!mc_protocol_parse_status_reply(buf, off, online, max)) {
-		error("Failed to get player count");
-		return false;
+		*error = "failed to get player count";
+		goto out;
 	}
 
+	rv = true;
+
 out:
 	close(fd);
 	return rv;
diff --git a/minecctl/mc-commands.h b/minecctl/mc-commands.h
index c6e2e6f..493a976 100644
--- a/minecctl/mc-commands.h
+++ b/minecctl/mc-commands.h
@@ -2,6 +2,7 @@
 #ifndef foomccommandshfoo
 #define foomccomanndshfoo
 
-bool do_mc_pcount(struct cfg *cfg, unsigned *online, unsigned *max);
+bool do_mc_pcount(struct cfg *cfg, struct server *server, unsigned *online,
+		  unsigned *max, const char **error);
 
 #endif
diff --git a/minecctl/misc-commands.c b/minecctl/misc-commands.c
index f89afb6..1870e07 100644
--- a/minecctl/misc-commands.c
+++ b/minecctl/misc-commands.c
@@ -5,6 +5,7 @@
 #include "misc-commands.h"
 #include "rcon-commands.h"
 #include "mc-commands.h"
+#include "shared/systemd.h"
 
 bool do_list(struct cfg *cfg)
 {
@@ -135,13 +136,65 @@ bool do_lint(struct cfg *cfg)
 
 bool do_pcount(struct cfg *cfg)
 {
-	unsigned x, y;
+	unsigned online, max;
+	struct server *server;
+	const char *error;
+
+	server = server_get_default(cfg);
+	if (!server) {
+		error("failed to get default server");
+		return false;
+	}
 
-	if (do_rcon_pcount(cfg, &y, &x))
-		error("Rcon says %u/%u", y, x);
+	if (do_rcon_pcount(cfg, server, &online, &max, &error))
+		info("Rcon says %u/%u", online, max);
 
-	if (do_mc_pcount(cfg, &y, &x))
-		error("MC says %u/%u", y, x);
+	if (do_mc_pcount(cfg, server, &online, &max, &error))
+		info("MC says %u/%u", online, max);
 
 	return true;
 }
+
+bool do_ping(struct cfg *cfg)
+{
+	struct server *server;
+	const char *error;
+	unsigned online, max;
+
+	/* FIXME: Do all servers when default not given */
+	server = server_get_default(cfg);
+	if (!server) {
+		error("failed to get default server");
+		return false;
+	}
+
+	info("• %s", server->name);
+
+	if (list_empty(&server->scfg.rcons))
+		info("  rcon            : not configured");
+	else if (!do_rcon_pcount(cfg, server, &online, &max, &error))
+		info("  rcon            : %sfail%s (%s)",
+		     ansi_red, ansi_normal, error);
+	else
+		info("  rcon            : %sok%s", ansi_green, ansi_normal);
+
+	if (list_empty(&server->scfg.remotes))
+		info("  mc              : not configured");
+	else if (!do_mc_pcount(cfg, server, &online, &max, &error))
+		info("  mc              : %sfail%s (%s)",
+		     ansi_red, ansi_normal, error);
+	else
+		info("  mc              : %sok%s", ansi_green, ansi_normal);
+
+	if (!server->scfg.systemd_service || !server->scfg.systemd_obj)
+		info("  systemd service : not configured");
+	else if (!systemd_service_running(&server->scfg, &error))
+		info("  systemd service : %sfail%s (%s)",
+		     ansi_red, ansi_normal, error);
+	else
+		info("  systemd service : %sactive%s", ansi_green, ansi_normal);
+	systemd_delete();
+
+	return true;
+}
+
diff --git a/minecctl/misc-commands.h b/minecctl/misc-commands.h
index 8ea4127..ac2fd54 100644
--- a/minecctl/misc-commands.h
+++ b/minecctl/misc-commands.h
@@ -8,4 +8,6 @@ bool do_lint(struct cfg *cfg);
 
 bool do_pcount(struct cfg *cfg);
 
+bool do_ping(struct cfg *cfg);
+
 #endif
diff --git a/minecctl/rcon-commands.c b/minecctl/rcon-commands.c
index f18f082..61a682c 100644
--- a/minecctl/rcon-commands.c
+++ b/minecctl/rcon-commands.c
@@ -12,8 +12,8 @@
 #include "shared/utils.h"
 #include "shared/rcon-protocol.h"
 #include "minecctl.h"
-#include "rcon-commands.h"
 #include "server.h"
+#include "rcon-commands.h"
 #include "misc.h"
 
 static void send_packet(int sfd, const char *buf, size_t len)
@@ -93,6 +93,7 @@ static void send_msg(int sfd, char *buf, size_t len, enum rcon_packet_type type,
 	rcon_packet_id++;
 }
 
+/* FIXME: return error message */
 static int rcon_login(struct cfg *cfg, struct server *server)
 {
 	const char *error;
@@ -296,12 +297,6 @@ bool do_status(struct cfg *cfg)
 	return true;
 }
 
-bool do_ping(_unused_ struct cfg *cfg)
-{
-	die("Not implemented");
-	return false;
-}
-
 static bool get_player_count(int fd, unsigned *current, unsigned *max)
 {
 	char buf[4096];
@@ -382,18 +377,21 @@ bool do_stop_all(struct cfg *cfg)
 	return rv;
 }
 
-bool do_rcon_pcount(struct cfg *cfg, unsigned *online, unsigned *max)
+bool do_rcon_pcount(struct cfg *cfg, struct server *server, unsigned *online,
+		    unsigned *max, const char **error)
 {
-	struct server *server;
 	bool rv;
 	int fd;
 
-	server = server_get_default(cfg);
 	fd = rcon_login(cfg, server);
-	if (fd < 0)
+	if (fd < 0) {
+		*error = "failed to login";
 		return false;
+	}	
 
 	rv = get_player_count(fd, online, max);
+	if (!rv)
+		*error = "failed to get player count";
 
 	close(fd);
 
diff --git a/minecctl/rcon-commands.h b/minecctl/rcon-commands.h
index b2720b4..84d5529 100644
--- a/minecctl/rcon-commands.h
+++ b/minecctl/rcon-commands.h
@@ -4,13 +4,12 @@
 
 bool do_status(struct cfg *cfg);
 
-bool do_ping(struct cfg *cfg);
-
 bool do_stop(struct cfg *cfg);
 
 bool do_stop_all(struct cfg *cfg);
 
-bool do_rcon_pcount(struct cfg *cfg, unsigned *online, unsigned *max);
+bool do_rcon_pcount(struct cfg *cfg, struct server *server, unsigned *online,
+		    unsigned *max, const char **error);
 
 bool do_console(struct cfg *cfg);
 
diff --git a/minecproxy/main.c b/minecproxy/main.c
index 238b612..c51b01c 100644
--- a/minecproxy/main.c
+++ b/minecproxy/main.c
@@ -24,7 +24,7 @@
 #include "server.h"
 #include "server-config.h"
 #include "announce.h"
-#include "systemd.h"
+#include "shared/systemd.h"
 #include "igmp.h"
 #include "idle.h"
 #include "ptimer.h"
@@ -177,7 +177,7 @@ static void cfg_free(struct uring_task *task)
 	assert_return(task && xcfg == cfg);
 
 	debug(DBG_SIG, "called");
-	systemd_delete(cfg);
+	systemd_delete();
 	xfree(cfg->igmp_iface);
 	cfg->igmp_iface = NULL;
 	exiting = true;
diff --git a/minecproxy/main.h b/minecproxy/main.h
index 12b16df..2c7be83 100644
--- a/minecproxy/main.h
+++ b/minecproxy/main.h
@@ -99,8 +99,6 @@ struct cfg {
 	struct ptimer *ptimer;
 	struct igmp *igmp;
 	struct idle *idle;
-	struct sd_bus *sd_bus;
-	bool sd_bus_failed;
 	struct uring_task task;
 	struct list_head servers;
 };
diff --git a/minecproxy/meson.build b/minecproxy/meson.build
index 959b975..155840c 100644
--- a/minecproxy/meson.build
+++ b/minecproxy/meson.build
@@ -11,17 +11,14 @@ minecproxy_sources = [
 	'idle.c',
 	'ptimer.c',
 	'igmp.c',
-	'systemd.c',
 	'misc.c',
 ]
 
 dep_liburing   = dependency('liburing')
-dep_libsystemd = dependency('libsystemd')
 dep_libcapng   = dependency('libcap-ng')
 
 minecproxy_deps = [
 	dep_liburing,
-	dep_libsystemd,
 	dep_libcapng,
 	dep_config_h,
 	dep_libshared,
diff --git a/minecproxy/server.c b/minecproxy/server.c
index d24c0ad..b1e9b05 100644
--- a/minecproxy/server.c
+++ b/minecproxy/server.c
@@ -18,9 +18,9 @@
 #include "server-config.h"
 #include "server-proxy.h"
 #include "server-rcon.h"
-#include "shared/config-parser.h"
 #include "idle.h"
-#include "systemd.h"
+#include "shared/config-parser.h"
+#include "shared/systemd.h"
 
 void server_refdump(struct server *server)
 {
@@ -218,13 +218,15 @@ static bool server_exec(struct server *server, const char *cmd)
 
 static bool server_check_running(struct server *server)
 {
+	const char *error;
+
 	assert_return(server, false);
 
 	/* FIXME: other methods, rcon? */
 	if (server->scfg.systemd_service) {
 		verbose("%s: checking if systemd service is running",
 			server->name);
-		if (systemd_service_running(server)) {
+		if (systemd_service_running(&server->scfg, &error)) {
 			server->state = SERVER_STATE_RUNNING;
 			return true;
 		} else {
@@ -252,7 +254,7 @@ bool server_start(struct server *server)
 			server->name,
 			server->scfg.systemd_service);
 
-		if (systemd_service_start(server)) {
+		if (systemd_service_start(&server->scfg)) {
 			server->state = SERVER_STATE_RUNNING;
 			return true;
 		} else
@@ -281,7 +283,7 @@ bool server_stop(struct server *server)
 		verbose("Stopping server %s via systemd (%s)",
 			server->name,
 			server->scfg.systemd_service);
-		if (systemd_service_stop(server)) {
+		if (systemd_service_stop(&server->scfg)) {
 			server->state = SERVER_STATE_STOPPED;
 			return true;
 		} else
diff --git a/minecproxy/systemd.c b/minecproxy/systemd.c
deleted file mode 100644
index 94d5b8b..0000000
--- a/minecproxy/systemd.c
+++ /dev/null
@@ -1,164 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#include <string.h>
-#include <stdlib.h>
-#include <systemd/sd-bus.h>
-#include <errno.h>
-
-#include "main.h"
-#include "server.h"
-#include "systemd.h"
-#include "config.h"
-
-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 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 *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->scfg.systemd_service &&
-			      server->scfg.systemd_obj,
-		      false);
-
-again:
-	r = sd_bus_get_property_string(bus, SYSTEMD_DBUS_SERVICE,
-				       server->scfg.systemd_obj,
-				       SYSTEMD_DBUS_INTERFACE, "ActiveState",
-				       &error, &status);
-	if (r < 0) {
-		if (sd_bus_error_get_errno(&error) == EINTR)
-			goto again;
-
-		error("failed to get status for service %s (%s): %s",
-		      server->scfg.systemd_service, server->scfg.systemd_obj,
-		      error.message);
-		goto out;
-	}
-
-	if (streq(status, "active")) {
-		running = true;
-		debug(DBG_SYSD, "systemd service %s (%s) is active",
-		      server->scfg.systemd_service, server->scfg.systemd_obj);
-	} else
-		debug(DBG_SYSD, "systemd service %s (%s) is not active",
-		      server->scfg.systemd_service, server->scfg.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->scfg.systemd_service &&
-			      server->scfg.systemd_obj && action,
-		      false);
-
-again:
-	r = sd_bus_call_method(bus, SYSTEMD_DBUS_SERVICE, server->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, server->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,
-		server->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 *server)
-{
-	assert_return(server, false);
-
-	return systemd_service_action(server, "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 *server)
-{
-	assert_return(server, false);
-
-	return systemd_service_action(server, "Start");
-}
diff --git a/minecproxy/systemd.h b/minecproxy/systemd.h
deleted file mode 100644
index f3f96e4..0000000
--- a/minecproxy/systemd.h
+++ /dev/null
@@ -1,13 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef foosystemdhfoo
-#define foosystemdhfoo
-
-void systemd_delete();
-
-bool systemd_service_running(struct server *server);
-
-bool systemd_service_stop(struct server *server);
-
-bool systemd_service_start(struct server *server);
-
-#endif
diff --git a/shared/meson.build b/shared/meson.build
index 021fe11..a937e92 100644
--- a/shared/meson.build
+++ b/shared/meson.build
@@ -3,10 +3,14 @@ srcs_libshared = [
 	'rcon-protocol.c',
 	'mc-protocol.c',
 	'config-parser.c',
+	'systemd.c',
 	'utils.c',
 ]
 
+dep_libsystemd = dependency('libsystemd')
+
 deps_libshared = [
+	dep_libsystemd,
 	dep_config_h,
 ]
 
diff --git a/shared/systemd.c b/shared/systemd.c
new file mode 100644
index 0000000..c45c7c5
--- /dev/null
+++ b/shared/systemd.c
@@ -0,0 +1,167 @@
+/* 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");
+}
diff --git a/shared/systemd.h b/shared/systemd.h
new file mode 100644
index 0000000..0da1eca
--- /dev/null
+++ b/shared/systemd.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef foosharedsystemdhfoo
+#define foosharedsystemdhfoo
+
+void systemd_delete();
+
+bool systemd_service_running(struct server_config *scfg, const char **error);
+
+bool systemd_service_stop(struct server_config *scfg);
+
+bool systemd_service_start(struct server_config *scfg);
+
+#endif
-- 
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