#!/bin/sh

default_binding="127.0.0.1:1080"
default_host="zyanlu@expample.net"
default_pid="$HOME/bin/tunnel.pid"

cmd="ssh -NCTqnD $default_binding $default_host"
on(){
off
$cmd &
echo $! > $default_pid
echo "$! tunnel opened"
}

off(){
if [ -f $default_pid ]
then
    pid=`cat $default_pid`
    process=`ps -p $pid | grep "$cmd"`
    if [ "$process" ]
    then
        kill $pid
        if [ $? = 0 ]
        then
            echo "$pid killed"
            rm $default_pid
        else
            echo "$pid not killed"    
        fi
    fi
fi
}

stat(){
ps -A | grep "$cmd" | grep -v "grep"
}
if [ "$1" = "off" ]
then
    off
elif [ "$1" = "on" ]
then
    on
else
    stat
fi