Bash script to setup/teardown SSH SOCKS proxy on macOS

socks-proxy

#!/bin/bash

if [[ -z "$1" ]]; then
  echo "usage: $0 [user@]hostname"
  exit 1
fi

ssh -ND 1080 "$1" &
PID=$!

INTERFACE=$(route get www.google.com | grep interface | awk '{ print $2 }')
SERVICE=$(networksetup -listnetworkserviceorder | grep "$INTERFACE" | awk -F ': |,' '{ print $2 }')

at_exit() {
  networksetup -setsocksfirewallproxystate "$SERVICE" off;
  ps -p "$PID" > /dev/null && kill -TERM "$PID"
}
trap at_exit EXIT

networksetup -setsocksfirewallproxy "$SERVICE" localhost 1080

wait "$PID"