Add unit systemd files

Signed-off-by: Adrien Gallouët <adrien@gallouet.fr>

meson.build

@@ -4,19 +4,46 @@ project('glorytun', 'c',
     default_options : [ 'buildtype=debugoptimized' ]
 )
 
+prefix = get_option('prefix')
+bindir = join_paths(prefix, get_option('bindir'))
+
+conf_data = configuration_data()
+conf_data.set('prefix', prefix)
+conf_data.set('bindir', bindir)
+
 add_global_arguments('-DPACKAGE_VERSION="'+meson.project_version()+'"', language : 'c')
 
 src = [
-  'src/common.c',
-  'src/iface.c',
-  'src/option.c',
-  'src/tun.c',
-  'mud/mud.c',
-  'src/main.c'
+    'src/common.c',
+    'src/iface.c',
+    'src/option.c',
+    'src/tun.c',
+    'mud/mud.c',
+    'src/main.c'
 ]
 
 deps = [
-  dependency('libsodium', version : '>=1.0.4')
+    dependency('libsodium', version : '>=1.0.4')
 ]
 
 executable('glorytun', install: true, sources: src, dependencies: deps)
+
+systemd = dependency('systemd')
+
+if systemd.found()
+  systemdutildir = systemd.get_pkgconfig_variable('systemdutildir')
+  configure_file(
+      input: 'systemd/glorytun@.service.in',
+      output: 'glorytun@.service',
+      configuration: conf_data,
+      install_dir: join_paths(systemdutildir, 'system')
+  )
+  install_data('systemd/glorytun.network',
+      install_dir: join_paths(systemdutildir, 'network'))
+  install_data('systemd/glorytun-client.network',
+      install_dir: join_paths(systemdutildir, 'network'))
+  install_data('systemd/glorytun-run',
+      install_dir: bindir)
+  install_data('systemd/glorytun-setup',
+      install_dir: bindir)
+endif

systemd/glorytun-client.network

@@ -0,0 +1,10 @@
+[Match]
+Name=gtc-*
+
+[Network]
+Description=Glorytun client device
+DHCP=ipv4
+
+[DHCP]
+CriticalConnection=yes
+RouteTable=200

systemd/glorytun-run

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+if [ ! -f "$1" ]; then
+	echo "usage: $(basename "$0") FILE"
+	exit 1
+fi
+
+. "$(readlink -f "$1")"
+
+DEV="gt${HOST:+c}-$(basename "$1")"
+
+# Setting BIND is like going to 'expert mode'
+# This helper is pretty stupid and still needs some work
+if [ -n "$HOST" ] && [ -z "$BIND" ]; then
+	BIND=$(ip route get "$HOST" | awk '/src/{getline;print $0}' RS=' ')
+	ip rule add from "$BIND" table main pref 32000
+	ip rule add from all table 200 pref 32001
+fi
+
+exec glorytun \
+	v4only \
+	keyfile "$1".key \
+	dev "$DEV" \
+	${HOST:+host "$HOST"} \
+	${PORT:+port "$PORT"} \
+	${BIND:+bind "$BIND"} \
+	${BIND_PORT:+bind-port "$BIND_PORT"} \
+	${MTU:+mtu "$MTU"} \
+	${MTU_AUTO:+mtu-auto}

systemd/glorytun-setup

@@ -0,0 +1,36 @@
+#!/bin/sh
+
+set -e
+
+_ask() {
+	printf "%s: " "$1"
+	read -r "$2"
+}
+
+_NAME=tun0
+_ask "Config filename ($_NAME)" NAME
+NAME=${NAME:-$_NAME}
+
+if [ -f /etc/glorytun/"$NAME" ]; then
+	echo "This config already exit!"
+	exit 1
+fi
+
+_ask "Server ip (enter for server conf)" HOST
+
+_ask "Server key (enter to generate a new one)" KEY
+if [ -z "$KEY" ]; then
+	KEY=$(glorytun keygen) || exit
+	echo "Your new key: $KEY"
+fi
+
+mkdir -p /etc/glorytun
+FILE="/etc/glorytun/$NAME"
+
+echo "${HOST:+HOST=$HOST}" > "$FILE"
+
+touch "$FILE.key"
+chmod 600 "$FILE.key"
+echo "$KEY" > "$FILE.key"
+
+echo "Done"

systemd/glorytun.network

@@ -0,0 +1,14 @@
+[Match]
+Name=gt-*
+
+[Network]
+Description=Glorytun server device
+Address=0.0.0.0/24
+DHCPServer=yes
+IPMasquerade=yes
+
+[DHCPServer]
+PoolOffset=2
+PoolSize=1
+EmitDNS=yes
+DNS=9.9.9.9

systemd/glorytun@.service.in

@@ -0,0 +1,12 @@
+[Unit]
+Description=Glorytun on %I
+After=network.target
+
+[Service]
+Type=simple
+Restart=always
+ExecStart=@bindir@/glorytun-run /etc/glorytun/%i
+CapabilityBoundingSet=CAP_NET_ADMIN
+
+[Install]
+WantedBy=multi-user.target