wg-netns.sh

#!/bin/sh
set -eu

NETNS="$(printf '%s' "$1" | sed -n 's#.*/\([^.]*\)\..*#\1#p')"

mkdir -p "/etc/netns/${NETNS}"
sed -nr 's/^DNS = (.*)/\1/p' "$1" | tr ',' '\n' | sed 's/^/nameserver /' > "/etc/netns/${NETNS}/resolv.conf"

ip netns del "${NETNS}" 2>/dev/null || :
ip netns add "${NETNS}"
ip link add "${NETNS}" type wireguard
sed 's/^Address =/#Address =/g;s/^DNS =/#DNS =/' "$1" | wg setconf "${NETNS}" /dev/stdin
ip link set "${NETNS}" netns "${NETNS}"
sed -nr 's/^Address = (.*)/\1/p' "$1" | tr ',' '\n' | sed "s/^/ip -n ${NETNS} addr add /;s/\$/ dev ${NETNS}/" | sh
ip -n "${NETNS}" link set "${NETNS}" up
ip -n "${NETNS}" route add default dev "${NETNS}"
ip -n "${NETNS}" link set lo up

License: CC0-1.0