vpnutils/ns-vpn-x

#! /bin/bash

usage() {
    printf "Usage: %s [-t <namespace suffix>]\n" "$0"
}

namespace=ns-vpn
while getopts t:h opt; do
    case $opt in
        h) usage
           exit
           ;;
        ?) 2>&1 usage
           exit 1
           ;;
    esac
done

netns_list=( $( find /run/netns/ -type f -regex ".*ns-vpn.*" -exec basename -a {} + | sort ) )
case "${#netns_list[@]}" in
    0)
        exit 0
        ;;
    1)
        namespace="${netns_list[0]}"
        ;;
    [1-9]*)
        namespace=$( for ns in "${netns_list[@]}"; do printf '%s\n' "$ns"; done | dmenu -l -8 )
        ;;
    *)
        exit 1
        ;;
esac

task=$(dmenu -l 8 << EOF
browser
screen
terminal
EOF
)

cmd=
case $task in
    browser)
        cmd="firefox"
        ;;
    screen)
        cmd="st -e screen -S $namespace"
        ;;
    terminal)
        cmd="tabbed -cr2 st -w '' -e /bin/bash -l"
        ;;
    *)
        exit 1
        ;;
esac

exec sudo /usr/bin/ip netns exec $namespace su -c "DISPLAY=$DISPLAY $cmd" $USER