[feature] Extract IP address from netif credit: @comicchang

README.md

@@ -10,10 +10,12 @@ Access your home network remotely via a custom domain name without a static IP!
 - 🔁 The Python runtime will re-use existing HTTP connections.
 - 🗃️ Cloudflare API responses are cached to reduce API usage.
 - 🤏 The Docker image is small and efficient.
-- 0️⃣ Zero dependencies.
+- 0️⃣ Zero weirdo dependencies.
 - 💪 Supports all platforms.
 - 🏠 Enables low cost self hosting to promote a more decentralized internet.
-- 🔒 Zero-log IP provider ([cdn-cgi/trace](https://www.cloudflare.com/cdn-cgi/trace))
+- 🧑‍🚀 Supports NAT and multiple network interfaces.
+  - 🔒 HTTP [(Zero-log IP provider)](https://www.cloudflare.com/cdn-cgi/trace)
+  - 💻 [Netif](https://pypi.org/project/netifaces/): `ppp0`, `eth0`, `wlan0`, etc.
 - 👐 GPL-3.0 License. Open source for open audits.
 
 ## 💯 Complete Support of Domain Names, Subdomains, and IPv4 & IPv6
@@ -69,6 +71,15 @@ Some ISP provided modems only allow port forwarding over IPv4 or IPv6. In this c
 "aaaa": true
 ```
 
+### 🧑‍🚀 Method used for getting IP address
+
+If you have multiple network interfaces, or if you are behind nat, you may need to enable alternative way to determine your IP address(es).
+
+```json
+"method": "netif",
+"interface": "ppp0"
+```
+
 ### 🎛️ Other values explained
 
 ```json
@@ -123,7 +134,9 @@ Do not include the base domain name in your `subdomains` config. Do not use the
   "a": true,
   "aaaa": true,
   "purgeUnknownRecords": false,
-  "ttl": 300
+  "ttl": 300,
+  "method": "http",
+  "interface": ""
 }
 ```
 
@@ -181,7 +194,10 @@ If you are using API Tokens, make sure the token used supports editing your zone
   ],
   "a": true,
   "aaaa": true,
-  "purgeUnknownRecords": false
+  "purgeUnknownRecords": false,
+  "ttl": 300,
+  "method": "http",
+  "interface": ""
 }
 ```
 

cloudflare-ddns.py

@@ -6,7 +6,7 @@
 #                A small, 🕵️ privacy centric, and ⚡
 #                lightning fast multi-architecture Docker image for self hosting projects.
 
-__version__ = "1.0.2"
+__version__ = "1.0.3"
 
 import json
 import os
@@ -15,6 +15,7 @@ import sys
 import threading
 import time
 import requests
+import netifaces as ni
 
 CONFIG_PATH = os.environ.get('CONFIG_PATH', os.getcwd())
 
@@ -56,7 +57,11 @@ def getIPs():
     global ipv4_enabled
     global ipv6_enabled
     global purgeUnknownRecords
+    global method
+    global interfaces
+    
     if ipv4_enabled:
+        if method == 'http':
             try:
                 a = requests.get(
                     "https://1.1.1.1/cdn-cgi/trace").text.split("\n")
@@ -80,7 +85,19 @@ def getIPs():
                         print("🧩 IPv4 not detected via 1.0.0.1. Verify your ISP or DNS provider isn't blocking Cloudflare's IPs.")
                     if purgeUnknownRecords:
                         deleteEntries("A")
+        else:
+            try:
+                a = ni.ifaddresses(interface)[ni.AF_INET][0]['addr']
+            except Exception:
+                global shown_ipv4_warning
+                if not shown_ipv4_warning:
+                    shown_ipv4_warning = True
+                    print("🧩 IPv4 not detected via " + interface + ". Verify your interface is up and has an IPv4 address.")
+                if purgeUnknownRecords:
+                    deleteEntries("A")
+        
     if ipv6_enabled:
+        if method == 'http':
             try:
                 aaaa = requests.get(
                     "https://[2606:4700:4700::1111]/cdn-cgi/trace").text.split("\n")
@@ -103,6 +120,17 @@ def getIPs():
                         print("🧩 IPv6 not detected via 1.0.0.1. Verify your ISP or DNS provider isn't blocking Cloudflare's IPs.")
                     if purgeUnknownRecords:
                         deleteEntries("AAAA")          
+        else:
+            try:
+                aaaa = ni.ifaddresses(interface)[ni.AF_INET6][0]['addr']
+            except Exception:
+                global shown_ipv6_warning
+                if not shown_ipv6_warning:
+                    shown_ipv6_warning = True
+                    print("🧩 IPv6 not detected via " + interface + ". Verify your interface is up and has an IPv6 address.")
+                if purgeUnknownRecords:
+                    deleteEntries("AAAA")
+        
     ips = {}
     if (a is not None):
         ips["ipv4"] = {
@@ -232,6 +260,8 @@ if __name__ == '__main__':
     ipv4_enabled = True
     ipv6_enabled = True
     purgeUnknownRecords = False
+    method = 'http'
+    interface = ''
 
     if sys.version_info < (3, 5):
         raise Exception("🐍 This script requires Python 3.5+")
@@ -253,6 +283,11 @@ if __name__ == '__main__':
             ipv4_enabled = True
             ipv6_enabled = True
             print("⚙️ Individually disable IPv4 or IPv6 with new config.json options. Read more about it here: https://github.com/timothymiller/cloudflare-ddns/blob/master/README.md")
+        try:
+            method = config["method"]
+            interface = config["interface"]
+        except:
+            print("⚙️ No config detected for 'method' - defaulting to 'http'")
         try:
             purgeUnknownRecords = config["purgeUnknownRecords"]
         except:

config-example.json

@@ -24,5 +24,7 @@
   "a": true,
   "aaaa": true,
   "purgeUnknownRecords": false,
-  "ttl": 300
+  "ttl": 300,
+  "method": "http",
+  "interface": ""
 }

requirements.txt

@@ -1 +1,2 @@
 requests==2.28.2
+netifaces==0.11.0