created script for port updates. need to dynamically get rpc username and password do some cron stuff. issue #1

updateTransmissionPort.sh

@@ -0,0 +1,57 @@
+#/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
+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\"' settings.json | 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
+