#!/bin/bash

set -xeuo pipefail

pidfile=${RUNTIME_DIRECTORY:-/tmp}/tunsocks.pid

nsname="$1"
device="tun${nsname}"
ns="${nsname}ns"

if [ "$2" = use_env ];then
		proxy="$SOCKS_PROXY"
		shift
else
		proxy="socks5:///run/nnss-${nsname}/sock"
fi

setup()
{
		ip tuntap add mode tun dev "$device"

		/usr/bin/tun2socks -device "$device" -proxy "$proxy" &
		echo "$!" > "$pidfile"
		sleep 5

		ip netns add "$ns"
		ip link set "$device" netns "$ns"

		ip -n "$ns" addr add 198.19.1.1/30 dev "$device"
		ip -n "$ns" link set dev "$device" up
		ip -n "$ns" route add default via 198.19.1.1 dev "$device" metric 100
		ip -n "$ns" link set lo up
		systemd-notify --ready
		wait
}

cleanup()
{
		ip tuntap del mode tun dev "$device" || true
		kill "$(cat "$pidfile")"
		ip -n "$ns" tuntap del mode tun dev "$device"
		ip netns del "$ns"
}

$2