docker-qBittorrentvpn/updateTransmissionPort.sh

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#/bin/bash
# Settings
PIA_PASSWD_FILE=/etc/openvpn/credentials.txt
username=$(head -1 $PIA_PASSWD_FILE)
passwd=$(tail -1 $PIA_PASSWD_FILE)
local_vpn_ip=$(ip addr show tun0 | grep inet | awk '{ print $2 }')
pia_client_id_file=/etc/transmission-daemon/pia_client_id
transmission_settings_file=/etc/transmission-daemon/settings.json
port_assignment_url=https://www.privateinternetaccess.com/vpninfo/port_forward_assignment
#
# First get a port from PIA
#
new_client_id() {
head -n 100 /dev/urandom | md5sum | tr -d " -" | tee $pia_client_id_file
}
pia_client_id="$(cat $pia_client_id_file 2>/dev/null)"
if [[ -z "$pia_client_id" ]]; then
echo "Generating new client id for PIA"
pia_client_id=$(new_client_id)
fi
# Get the port
pia_response=$(curl -d "user=$username&pass=$passwd&client_id=$pia_client_id&local_ip=$local_vpn_ip" $port_assignment_url)
new_port=$(echo $pia_response | grep -oE "[0-9]+")
echo "Got new port $new_port from pia"
#
# Now, set port in Transmission
#
# Check if transmission remote is set up with authentication
auth_enabled=$(grep 'rpc-authentication-required\"' $transmission_settings_file | grep -oE 'true|false')
if [[ "true" = "$auth_enabled" ]]
then
echo "transmission auth required"
myauth="--auth username:password"
else
echo "transmission auth not required"
myauth=""
fi
# get current listening port
transmission_peer_port=$(transmission-remote $myauth -si | grep Listenport | grep -oE '[0-9]+')
if [[ "$new_port" != "$transmission_peer_port" ]]
then
transmission-remote $myauth -p "$new_port"
echo "Checking port..."
sleep 10 && transmission-remote $myauth -pt
else
echo "No action needed, port hasn't changed"
fi