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"}