Initial commit

Dockerfile

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+FROM python:3.14.7-alpine3.24
+
+# Install dnsmasq
+RUN apk --update --no-cache add dnsmasq
+
+# Install libraries
+COPY ./requirements.txt /requirements.txt
+RUN pip3 install -r /requirements.txt
+
+# Copy source
+COPY ./run.sh /run.sh
+COPY ./app/ /app
+
+RUN mkdir /app/hosts.d/
+
+CMD ["/run.sh"]

app/main.py

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+from flask import Flask, jsonify, request
+import re
+
+
+
+HOSTS_PATH = "/app/hosts.d/izbi"
+
+
+
+app = Flask(__name__)
+
+hosts = {}
+
+
+
+def update_hosts(path: str, hosts: dict = {}): bool
+    try:
+        hosts_str = ""
+        for domain, ip in hosts.items():
+            hosts_str += f"{ip}\t{domain}\n"
+        with open(path, "w") as f:
+            f.write(hosts_str)
+        print(f"ddns - updated {path}")
+        return True
+    except Exception as e:
+        print(e)
+        return False
+
+
+
+def validate_ip(ip: str): bool
+    exp = "^((25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9]?[0-9])$"
+    return re.search(exp, ip)
+
+
+
+@app.route('/', methods=["GET"])
+def health():
+    return jsonify({"status": "healthy", "comment": ""})
+
+
+
+@app.route('/update', methods=["GET"])
+def update_addr():
+    if 'domain' not in request.args:
+        return jsonify({"status": "400", "code": "domain-error", "comment": "Missing or invalid domain"}), 400
+    domain = request.args['domain']
+
+    if 'ip' not in request.args:
+        ip = request.remote_addr
+    elif not validate_ip(request.args['ip']):
+        return jsonify({"status": "400", "code": "ip-error", "comment": "Invalid IP"}), 400
+    else:
+        ip = request.args['ip']
+
+    print(f"ddns - update request of [{domain}, {ip}] from {request.remote_addr}")
+
+    hosts[domain] = ip
+    success = update_hosts(HOSTS_PATH, hosts)
+
+    if not success:
+        return jsonify({"status": "500", "code": "internal-server-error", "An error occurred while processing request"}), 500
+
+    return jsonify({"status": "200", "code": "ok", "comment": "Updated successfully"})
+
+
+
+if __name__ == '__main__':
+    app.run(host="0.0.0.0", port=8080, debug=True)

docker-compose.yml

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+services:
+  ddns:
+    image: izbi-dns
+    build: .
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:8080:8080"
+      - "127.0.0.1:55:5353/udp"

requirements.txt

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+flask

run.sh

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+#!/bin/sh
+
+/usr/sbin/dnsmasq -d --hostsdir /app/hosts.d/ -p 5353 &
+
+/usr/local/bin/python3 /app/main.py &
+
+wait -n
+
+exit $?