Proxy local port to remote host via SSH

stun.sh

#!/bin/bash

#Usage: ./stun.sh [email protected] [Destination port] [Local port (optional)] 


DESTINATION=$1
DEST_PORT=$2
PROXY_PORT=$((RANDOM%10000+10000))

#Set local port to same as remote if unset 
if [ -z $3 ]; then
        LOCAL_PORT=$2
else
        LOCAL_PORT=$3
fi

echo "Establishing SSH tunnel ..."
ssh -fN -D localhost:$PROXY_PORT $DESTINATION
if [[ $? -ne 0 ]]; then
        echo "Failed!"
        exit 1
else
        echo "SSH Tunnel Established."
fi

echo "Proxying local port $LOCAL_PORT to $DEST_PORT at $DESTINATION (through local $PROXY_PORT)."
socat TCP-LISTEN:$LOCAL_PORT,fork SOCKS4:127.0.0.1:localhost:$DEST_PORT,socksport=$PROXY_PORT