Simplify systemd files

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

systemd/glorytun-run

@@ -1,37 +1,8 @@
 #!/bin/sh
 
-set -e
-
-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" ]; then
-	if [ -z "$PREF" ]; then
-		PREF=$(ip rule | awk '/from all lookup main/{print $1; exit}' | tr -d :)
-		PREF=$((PREF-1))
-	fi
-	if [ -z "$BIND" ]; then
-		BIND=$(ip route get "$HOST" | awk '/src/{getline;print $0}' RS=' ')
-		ip rule add from "$BIND" table main pref "$((PREF-1))" || true
-	fi
-	ip rule add from all table 200 pref "$PREF" || true
-fi
-
-exec glorytun \
-	v4only \
-	keyfile "$1".key \
-	dev "$DEV" \
+exec glorytun "$@" \
+	${DEV:+dev "$DEV"} \
 	${HOST:+host "$HOST"} \
 	${PORT:+port "$PORT"} \
 	${BIND:+bind "$BIND"} \
-	${BIND_PORT:+bind-port "$BIND_PORT"} \
-	${MTU:+mtu "$MTU"} \
-	${MTU_AUTO:+mtu-auto}
+	${BIND_PORT:+bind-port "$BIND_PORT"}

systemd/glorytun-setup

@@ -9,8 +9,9 @@ _ask() {
 
 _ask "Config filename (tun0)" NAME
 NAME=${NAME:-tun0}
+DIR="/etc/glorytun/$NAME"
 
-if [ -f /etc/glorytun/"$NAME" ]; then
+if [ -d "$DIR" ]; then
 	echo "This config already exit!"
 	exit 1
 fi
@@ -31,16 +32,32 @@ if [ -z "$KEY" ]; then
 fi
 
 # install files
-mkdir -p /etc/glorytun
+mkdir -p "$DIR"
 
-cat > /etc/glorytun/"$NAME" <<EOF
+cat > "$DIR/env" <<EOF
+DEV=gt${HOST:+c}-$NAME
 HOST=$HOST
-BIND_PORT=$BIND_PORT
 PORT=$PORT
-MTU_AUTO=yes
+BIND_PORT=$BIND_PORT
+OPTIONS=v4only mtu-auto
 EOF
 
-( umask 077; echo "$KEY" > /etc/glorytun/"$NAME".key )
+( umask 077; echo "$KEY" > "$DIR/key" )
+
+[ "$HOST" ] && cat > "$DIR/post.sh" <<'EOF'
+#!/bin/sh
+
+PREF=32765
+TABLE=200
+
+# keep the current route to HOST
+src=$(ip route get "$HOST" | awk '/src/{getline;print $0}' RS=' ')
+ip rule add from "$src" table main pref "$((PREF-1))" || true
+
+# forward everything else to the tunnel
+ip rule add from all table "$TABLE" pref "$PREF" || true
+EOF
+[ -f "$DIR/post.sh" ] && chmod u+x "$DIR/post.sh"
 
 # start services
 _ask "Start glorytun now ? (enter to skip)" START

systemd/glorytun@.service.in

@@ -5,7 +5,9 @@ After=network.target
 [Service]
 Type=simple
 Restart=always
-ExecStart=@bindir@/glorytun-run /etc/glorytun/%i
+EnvironmentFile=/etc/glorytun/%i/env
+ExecStart=@bindir@/glorytun-run keyfile /etc/glorytun/%i/key $OPTIONS
+ExecStartPost=-/etc/glorytun/%i/post.sh
 CapabilityBoundingSet=CAP_NET_ADMIN CAP_NET_RAW
 
 [Install]