osx: launch and use socks proxy

proxyup

#!/bin/bash

host=$1
port=$2

function usage() {
  echo "usage: $(basename $0) host [port=2046]"
  exit 1
}

if [ $(id -u) -ne 0 ]; then
  echo "$(basename $0): this script must be run as root"
  usage
fi

if [ -z $host ]; then
  usage
fi

if [ -z $port ]; then
  port=2046
fi

ssh -F $HOME/.ssh/config -TD $port $host &
sshpid=$!
echo "ssh running on PID $sshpid"

networksetup -setsocksfirewallproxy "Wi-Fi" localhost $port
networksetup -setsocksfirewallproxystate "Wi-Fi" on

function sigint() {
  echo "caught SIGINT, terminating"
  kill $sshpid
  networksetup -setsocksfirewallproxystate "Wi-Fi" off
  exit 0
}

trap sigint SIGINT

wait $sshpid

echo "ssh died, terminating"
osascript -e \
  "display \"warning: proxy went offline\" with title \"$(basename $0)\""
networksetup -setsocksfirewallproxystate "Wi-Fi" off
exit 1