Bash script for updating Transmission IP/port for Private Internet Access via OpenVPN.

autoport_autobind_transmission.sh

#!/bin/sh

# FILL OUT YOUR INFO HERE

LOGIN=PIA LOGIN HERE
PASSWORD=PIA PASSWORD HERE
USER=TRANSMISSION LOGIN HERE
PASS=TRANSMISSION PASSWORD HERE
BIN="/usr/bin/transmission-remote"
LOGGING="/home/USERNAME/transmission_logging.txt"

# ASSUMPTIONS
# VPN adapter is "tun0", so update if you need to

# No changes needed below here

# Check for torrents, if 2 then stop Open VPN and quit script
TORRENTCOUNT=`$BIN -n $USER:$PASS --list | wc -l`
OPENVPNRUNNING=`ip link show dev tun0 | grep 1500 | wc -l`

if [ $TORRENTCOUNT -le 2 ];
        then
                if [ $OPENVPNRUNNING = 1 ];
                        then
                                service openvpn stop
                                echo `date +"%m-%d-%Y %T"`" - OpenVPN Stopped" >> $LOGGING
                                exit
                fi
        else
                if [ $OPENVPNRUNNING = 0 ];
                        then
                                service openvpn start
                                echo `date +"%m-%d-%Y %T"`" - OpenVPN Started" >> $LOGGING
                                sleep 10
                fi
                # Update Bind address
                VPNADDR=`ifconfig tun0 | grep -oE "inet addr: *10\.[0-9]+\.[0-9]+\.[0-9]+"|tr -d "a-z :"|tee /tmp/vpn_ip`
                CURRENTBIND=`cat /etc/transmission-daemon/settings.json | grep bind-address-ipv4 | cut -f2 -d":" | tr -d " \"\,"`

                if [ "$CURRENTBIND" != "$VPNADDR" ];then
                        # Transmission will not all updating of bind address while running.
                        service transmission-daemon stop
                        sed -i "s/.*bind-address-ipv4.*/    \"bind-address-ipv4\"\: \"$VPNADDR\",/g" /etc/transmission-daemon/settings.json
                        service transmission-daemon start
                        echo `date +"%m-%d-%Y %T"`" - Bind Address updated to "$VPNADDR >> $LOGGING
                        sleep 10
                fi

                # PORT FORWARD UPDATE
                PORTOPEN=`$BIN -n $USER:$PASS --port-test | cut -f2 -d":" | sed 's/ //g'`

                if [ $PORTOPEN != Yes ];then
                        CURRENTIP=`ifconfig tun0 | grep -oE "inet addr: *10\.[0-9]+\.[0-9]+\.[0-9]+"|tr -d "a-z :"|tee /tmp/vpn_ip`
                        PORTFOUND=`curl -s -d "user=$LOGIN&pass=$PASSWORD&client_id=$(cat ~/.pia_client_id)&local_ip=$CURRENTIP" https://www.privateinternetaccess.com/vpninfo/port_forward_assignment | sed 's/[^0-9]*//g'`
                        echo `date +"%m-%d-%Y %T"`" - VPN Port Updated to "$PORTFOUND >> $LOGGING
                        $BIN -n $USER:$PASS --port $PORTFOUND
                fi

                # Clean up completed torrents, one per run
                if [ $TORRENTCOUNT -gt 0 ];then
                        TORRENTID=`$BIN -n $USER:$PASS --list | sed -n 2p | awk '{ print $1 }'`
                        TORRENTSTATE=`$BIN -n $USER:$PASS -t $TORRENTID --info | grep State | cut -d' ' -f4`
                        TORRENTNAME=`$BIN -n $USER:$PASS -t $TORRENTID --info | grep Name | cut -d':' -f2 | sed 's/^ //g'`
                        if [ $TORRENTSTATE = "Finished" ];then
                                $BIN -n $USER:$PASS -t $TORRENTID --remove
                                echo `date +"%m-%d-%Y %T"`" - Torrent Removed - $TORRENTNAME" >> $LOGGING
                        fi
                fi
fi

REQUIREMENTS:

• Ubuntu Server 16.04 LTS
• Transmission Client
• OpenVPN configured to connect to Private Internet Access

PURPOSE:

I've been running a version of this in a cron job for 18months, without fail. PIA is great, but you will lose connection every once in a while, so you'll pull a new IP. Also, if you are maximizing your connection you have port forwarding enabled thru PIA, but this changes every so often also.

This script will reset the IP and the Port as needed.

SUGGESTED USE:

Put this in a cron job and have it run every 5 mins to keep your torrents flowing.