mac_ssh_proxy.sh

#!/usr/bin/env bash
# auto start ssh proxy under mac osx, need to sshpass support
# goto http://sourceforge.net/projects/sshpass/ download http://nchc.dl.sourceforge.net/project/sshpass/sshpass/1.05/sshpass-1.05.tar.gz
# cd ~/Downloads
# tar -zxvf sshpass-1.05.tar.gz
# cd sshpass-1.05
# ./configure
# make
# sudo make install
# done

SSH_USER=<your ssh username>
SSH_PASS=<your ssh pass>
SSH_PORT=22
SSH_HOST=<your ssh host>
SSH_FORWARD=<the proxy port you want to use, the same in your pac file>

#run `networksetup listallnetworkservices` to get available network service names
SERVICE="Wi-Fi"
#use a server to serve the pac file is better than static file
PAC_URL="http://127.0.0.1:8080/gfw.pac"

#do not use proxy when close this script
on_die() {
  echo 
  echo proxy off
  echo 
  sudo networksetup -setautoproxystate ${SERVICE} off
}

trap "on_die" SIGTERM
trap "on_die" SIGINT
trap "on_die" SIGHUP

#when start this script, start the proxy
sudo networksetup -setautoproxystate ${SERVICE} off
sudo networksetup -setautoproxyurl ${SERVICE} ${PAC_URL}
sudo networksetup -setautoproxystate ${SERVICE} on
echo 
echo now connect to the ssh server...
echo 
sshpass -p ${SSH_USER} ssh -o StrictHostKeyChecking=no -N -D ${SSH_FORWARD} ${SSH_USER}@${SSH_HOST} -p ${SSH_PORT}