From 144da958ddac2c25d5b0a7fce9dd66f9ce821d1f Mon Sep 17 00:00:00 2001
From: wiktr <wiktr@noreply.local>
Date: Fri, 21 Aug 2026 23:19:27 +0200
Subject: [PATCH] Initial commit

---
 Dockerfile         | 16 +++++++++++
 app/main.py        | 69 ++++++++++++++++++++++++++++++++++++++++++++++
 docker-compose.yml |  8 ++++++
 requirements.txt   |  1 +
 run.sh             |  9 ++++++
 5 files changed, 103 insertions(+)
 create mode 100644 Dockerfile
 create mode 100644 app/main.py
 create mode 100644 docker-compose.yml
 create mode 100644 requirements.txt
 create mode 100755 run.sh

diff --git a/Dockerfile b/Dockerfile
new file mode 100644
index 0000000..a2c9da8
--- /dev/null
+++ b/Dockerfile
@@ -0,0 +1,16 @@
+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"]
diff --git a/app/main.py b/app/main.py
new file mode 100644
index 0000000..ff28e30
--- /dev/null
+++ b/app/main.py
@@ -0,0 +1,69 @@
+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)
diff --git a/docker-compose.yml b/docker-compose.yml
new file mode 100644
index 0000000..6c0544d
--- /dev/null
+++ b/docker-compose.yml
@@ -0,0 +1,8 @@
+services:
+  ddns:
+    image: izbi-dns
+    build: .
+    restart: unless-stopped
+    ports:
+      - "127.0.0.1:8080:8080"
+      - "127.0.0.1:55:5353/udp"
diff --git a/requirements.txt b/requirements.txt
new file mode 100644
index 0000000..7e10602
--- /dev/null
+++ b/requirements.txt
@@ -0,0 +1 @@
+flask
diff --git a/run.sh b/run.sh
new file mode 100755
index 0000000..5b9c8d8
--- /dev/null
+++ b/run.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+/usr/sbin/dnsmasq -d --hostsdir /app/hosts.d/ -p 5353 &
+
+/usr/local/bin/python3 /app/main.py &
+
+wait -n
+
+exit $?