stun.sh

# Func: Start an SSH tunnel (autossh) to a server $1 and map it to a
# local port $2 (default to 8888), which can be used as a SOCK. Start
# a HTTP proxy server (polipo) with proxy port $3 (default to 8123) 
# and point it to the SSH tunnel.
#
# See also:
#   autossh (http://www.harding.motd.ca/autossh/)
#   polipo (https://www.irif.univ-paris-diderot.fr/~jch/software/polipo/)
#
# Usages:
#   stun john@awesome.org
#   stun john@awesome.org 8080 7777
# 
# Note: 
#   You must make sure you can ssh to the remote host passwordlessly 
#   first. To make this happen, simply do this on your local host.
#     ssh-keygen # No passphrase
#     ssh-copy-id john@awesome.org
#   And now you should ssh to the host without being asked to enter a 
#   password.
#     ssh john@awesome.org
# 
function stun() {

    if [ -z $1 ]; then
        echo "${FUNCNAME}() requires at least one parameter, `server`."
    fi
    server=$1

    tunnel_port=$2
    if [ -z $tunnel_port ]; then
        tunnel_port=8888
    fi

    proxy_port=$3
    if [ -z $proxy_port ]; then
        proxy_port=8123
    fi

    # Restart ssh & autossh
    killall -q ssh
    killall -q autossh
    #ssh -o TCPKeepAlive=yes -o ServerAliveInterval=50 -f -C -D 127.0.0.1:${tunnel_port} ${server} -N
    autossh -M 0 -f -o TCPKeepAlive=yes -o ServerAliveInterval=50 -f -C -D 127.0.0.1:${tunnel_port} ${server} -N

    # Restart polipo
    killall -q polipo
    polipo daemonise=true socksParentProxy=127.0.0.1:${tunnel_port} proxyPort=${proxy_port}
}