docker-qBittorrentvpn/transmission/updatePort.sh
kumy efe4824546 Fix detecting ipv4 tunnel address
The original grep expression will fails if server support also ipv6.

```
qbittorrent    | + ip addr show tun0
qbittorrent    | + grep inet
qbittorrent    | + awk { print $2 }
qbittorrent    | + local_vpn_ip=10.2.10.6
qbittorrent    | fe80::faac:xxx:xxx:xxx/64
qbittorrent    | + pia_client_id_file=/etc/transmission/pia_client_id
qbittorrent    | + transmission_settings_file=/data/transmission-home/settings.json
qbittorrent    | + port_assignment_url=https://www.privateinternetaccess.com/vpninfo/port_forward_assignment
qbittorrent    | + cat /etc/transmission/pia_client_id
qbittorrent    | + pia_client_id=6fe581ea5b6273a88ed8421b4ceed454
qbittorrent    | + [ -z 6fe581ea5b6273a88ed8421b4ceed454 ]
qbittorrent    | + curl -d user=xxx&pass=xxx&client_id=6fe581ea5b6273a88ed8421b4ceed454&local_ip=10.2.10.6
qbittorrent    | fe80::faac:xxx:xxx:xxx/64 https://www.privateinternetaccess.com/vpninfo/port_forward_assignment
qbittorrent    |   % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
qbittorrent    |                                  Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
```
2016-11-03 20:18:16 +01:00

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#! /bin/sh
# Source our persisted env variables from container startup
. /etc/transmission/environment-variables.sh
# Settings
PIA_PASSWD_FILE=/config/openvpn-credentials.txt
TRANSMISSION_PASSWD_FILE=/config/transmission-credentials.txt
pia_username=$(head -1 $PIA_PASSWD_FILE)
pia_passwd=$(tail -1 $PIA_PASSWD_FILE)
transmission_username=$(head -1 $TRANSMISSION_PASSWD_FILE)
transmission_passwd=$(tail -1 $TRANSMISSION_PASSWD_FILE)
local_vpn_ip=$(ip addr show tun0 | grep "inet " | awk '{ print $2 }')
pia_client_id_file=/etc/transmission/pia_client_id
transmission_settings_file=${TRANSMISSION_HOME}/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=$(curl -d "user=$pia_username&pass=$pia_passwd&client_id=$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 $transmission_username:$transmission_passwd"
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