new: push Dockerfile and start script

Dockerfile

@@ -0,0 +1,24 @@
+FROM ubuntu:jammy
+
+LABEL version="0.1"
+LABEL description="Map NAT-PMP/UPnP port and update qBittorrent configuration"
+
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt update
+RUN apt install --no-install-suggests --no-install-recommends -y natpmpc curl
+RUN rm -rf /var/lib/apt/lists/* /var/cache/apt/*
+RUN apt clean
+
+ENV QBITTORRENT_SERVER=''
+ENV QBITTORRENT_PORT='8080'
+ENV QBITTORRENT_USER='admin'
+ENV QBITTORRENT_PASS='adminadmin'
+ENV VPN_GATEWAY=''
+ENV CHECK_INTERVAL='300'
+ENV NAT_LEASE_LIFETIME='3600'
+
+COPY data/start.sh /start.sh
+RUN chmod 750 /start.sh
+
+CMD ["./start.sh"]

README.md

@@ -1 +1,7 @@
 # qbittorrent-natmap
+
+Docker container to maintain and update the NAT-PMP/UPnP forwarded port to qBittorrent.
+
+Tested with Gluetun using ProtonVPN (Wireguard) and qBittorrent
+
+Can probably need a few tweaks and error handling

data/start.sh

@@ -0,0 +1,61 @@
+#!/usr/bin/env bash
+
+timestamp() {
+    date '+%Y-%m-%d %H:%M:%S'
+}
+
+getpublicip() {
+    natpmpc -g ${VPN_GATEWAY} | grep -oP '(?<=Public.IP.address.:.).*'
+}
+
+findconfiguredport() {
+    curl -s -i --header "Referer: http://${QBITTORRENT_SERVER}:${QBITTORRENT_PORT}" --cookie "$1" http://${QBITTORRENT_SERVER}:${QBITTORRENT_PORT}/api/v2/app/preferences | grep -oP '(?<=\"listen_port\"\:)(\d{1,5})'
+}
+
+findactiveport() {
+    natpmpc -g ${VPN_GATEWAY} -a 0 0 tcp ${NAT_LEASE_LIFETIME} | grep -oP '(?<=Mapped public port.).*(?=.protocol.*)'
+}
+
+qbt_login() {
+    curl -s -i --header "Referer: http://${QBITTORRENT_SERVER}:${QBITTORRENT_PORT}" --data "username=${QBITTORRENT_USER}&password=${QBITTORRENT_PASS}" http://${QBITTORRENT_SERVER}:${QBITTORRENT_PORT}/api/v2/auth/login | grep -oP '(?!set-cookie:.)SID=.*(?=\;.HttpOnly\;.path=\/\;)'
+}
+
+qbt_changeport(){
+    curl -s -i --header "Referer: http://${QBITTORRENT_SERVER}:${QBITTORRENT_PORT}" --cookie "$1" --data-urlencode "json={\"listen_port\":$2,\"random_port\":false,\"upnp\":false}" http://${QBITTORRENT_SERVER}:${QBITTORRENT_PORT}/api/v2/app/setPreferences 2>&1 >/dev/null
+    return $?
+}
+
+public_ip=''
+qbt_sid=''
+configured_port=''
+active_port=''
+
+check() {
+    public_ip=$(getpublicip)
+    qbt_sid=$(qbt_login)
+    configured_port=$(findconfiguredport ${qbt_sid})
+    active_port=$(findactiveport)
+
+    echo "$(timestamp) | Public IP: ${public_ip}"
+    echo "$(timestamp) | Configured Port: ${configured_port}"
+    echo "$(timestamp) | Active Port: ${active_port}"
+
+    if [ ${configured_port} != ${active_port} ]; then
+        if qbt_changeport ${qbt_sid} ${active_port}; then
+            sleep 3
+            echo "$(timestamp) | Port Changed to: $(findconfiguredport ${qbt_sid})"
+        else
+            echo "$(timestamp) | Port Change failed."
+        fi
+    else
+        echo "$(timestamp) | Port OK (Act: ${active_port} Cfg: ${configured_port})"
+    fi
+}
+
+while true;
+do
+    check
+    sleep ${CHECK_INTERVAL}
+done
+
+exit $?