upnp set up script

setup_upnp.sh

#!/bin/bash
export IP=$(/sbin/ifconfig eth0 | grep 'inet addr:' | cut -d: -f2 | awk '{ print $1}')
echo "setting up ip ${IP}"

check_service(){
  echo `upnpc -l | grep $1'->' | grep -oE "\b([0-9]{1,3}\.){3}[0-9]{1,3}\b"`
}

register(){
  local service_name=$1
  local port=$2
  local forward_port=$3
  local protocol=$4
  local existing=$(check_service $forward_port)
  if [ -z $existing ] 
  then
    echo "registering $service_name"
    upnpc -a ${IP} ${port} ${forward_port} ${protocol} > /dev/null
  elif [ "$existing" != "$IP" ] 
  then
    echo "unregistering $service_name from '$existing'"
    upnpc -d ${forward_port} ${protocol} > /dev/null
    echo 'registering transmission'
    upnpc -a ${IP} ${port} ${forward_port} ${protocol} > /dev/null
  else
    echo "$service_name already configured"
  fi
}

register ssh 22 2200 TCP
register transmision_web_ui 9091 9091 TCP