From 88752877adff0a409de0a15d0462288ccdcc0e9d Mon Sep 17 00:00:00 2001
From: dgtlmoon <dgtlmoon@gmail.com>
Date: Wed, 11 Jun 2025 11:07:08 +0200
Subject: [PATCH] IPv6 tidy-up Re #3248

---
 .github/workflows/test-stack-reusable-workflow.yml | 9 +++++++++
 changedetectionio/__init__.py                      | 7 +------
 docker-compose.yml                                 | 5 +++++
 3 files changed, 15 insertions(+), 6 deletions(-)

diff --git a/.github/workflows/test-stack-reusable-workflow.yml b/.github/workflows/test-stack-reusable-workflow.yml
index e3712e014..c5b1af959 100644
--- a/.github/workflows/test-stack-reusable-workflow.yml
+++ b/.github/workflows/test-stack-reusable-workflow.yml
@@ -190,6 +190,15 @@ jobs:
       
           docker kill test-changedetectionio-ssl
 
+      - name: Test IPv6 Mode
+        run: |
+          # IPv6 - :: bind to all interfaces inside container (like 0.0.0.0), ::1 would be localhost only
+          docker run --name test-changedetectionio-ipv6 --rm -p 5000:5000 -e LISTEN_HOST=:: -d test-changedetectionio
+          sleep 3
+          # Should return 0 (no error) when grep finds it on localhost
+          curl --retry-connrefused --retry 6 http://[::1]:5000 -v|grep -q checkbox-uuid
+          docker kill test-changedetectionio-ipv6
+
       - name: Test changedetection.io SIGTERM and SIGINT signal shutdown
         run: |
           
diff --git a/changedetectionio/__init__.py b/changedetectionio/__init__.py
index 5015dc865..89af55fd1 100644
--- a/changedetectionio/__init__.py
+++ b/changedetectionio/__init__.py
@@ -65,8 +65,7 @@ def main():
 
     datastore_path = None
     do_cleanup = False
-    host = "0.0.0.0"
-    ipv6_enabled = False
+    host = os.environ.get("LISTEN_HOST", "0.0.0.0").strip()
     port = int(os.environ.get('PORT', 5000))
     ssl_mode = False
 
@@ -108,10 +107,6 @@ def main():
         if opt == '-d':
             datastore_path = arg
 
-        if opt == '-6':
-            logger.success("Enabling IPv6 listen support")
-            ipv6_enabled = True
-
         # Cleanup (remove text files that arent in the index)
         if opt == '-c':
             do_cleanup = True
diff --git a/docker-compose.yml b/docker-compose.yml
index e8b1f626c..f89e5f971 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -74,6 +74,11 @@ services:
   #        ./cert.pem:/app/cert.pem and ./privkey.pem:/app/privkey.pem
   #      - SSL_CERT_FILE=cert.pem
   #      - SSL_PRIVKEY_FILE=privkey.pem
+  #
+  #        LISTEN_HOST / "host", Same as -h
+  #      - LISTEN_HOST=::
+  #      - LISTEN_HOST=0.0.0.0
+
   
       # Comment out ports: when using behind a reverse proxy , enable networks: etc.
       ports: