Enable port forwarding from freenas jail using openvpn transmission and PIA

port_forward.sh

#! /usr/local/bin/bash
#
# Script also based on Nodja's script at https://forums.freenas.org/index.php?threads/guide-setting-up-transmission-with-openvpn-and-pia.24566/page-10#post-248580
#
# to generate a new client id run
#   head -n 100 /dev/urandom | md5 -r | tr -d " -"
# in any terminal
#
# usage: ./port_forward.sh
# note: you must install bash in the jail first "pkg install bash"
# once working setup a cron job in freenas "jexec transmission_1 bash /port_forward.sh" obviously change transmission_1 to match your transmission jail name and port_forward.sh to match your script name and location
 
SCRIPTDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
PROGRAM=`basename $0`
USER=xxxxxxxxxxx
PASSWORD=xxxxxxxxxxx
RPCUSER=xxxxxxxxxxx
RPCPASSWORD=xxxxxxxxxxx
CLIENT_ID=xxxxxxxxxxx
 
local_ip=`ifconfig tun0 | grep "inet " | cut -d\  -f2|tee /tmp/vpn_ip`
json=`wget --no-check-certificate -q --post-data="user=$USER&pass=$PASSWORD&client_id=$CLIENT_ID&local_ip=$local_ip" -O - "https://www.privateinternetaccess.com/vpninfo/port_forward_assignment"  | head -1`
PORTNUM=`echo $json | grep -oE "[0-9]+"`
echo $PORTNUM
transmission-remote --auth $RPCUSER:$RPCPASSWORD -l -p $PORTNUM
 
exit 0