From 741959f9882c132ce178f54adb771ef3f37884a2 Mon Sep 17 00:00:00 2001
From: dgtlmoon <dgtlmoon@gmail.com>
Date: Sun, 22 Jan 2023 10:48:32 +0100
Subject: [PATCH] Re #1328 - add `-6` flag to enable IPv6

---
 changedetectionio/changedetection.py | 20 ++++++++++++++------
 1 file changed, 14 insertions(+), 6 deletions(-)

diff --git a/changedetectionio/changedetection.py b/changedetectionio/changedetection.py
index a252473f..b0106513 100755
--- a/changedetectionio/changedetection.py
+++ b/changedetectionio/changedetection.py
@@ -31,11 +31,13 @@ def sigterm_handler(_signo, _stack_frame):
 def main():
     global datastore
     global app
-    ssl_mode = False
+
+    datastore_path = None
+    do_cleanup = False
     host = ''
+    ipv6_enabled = False
     port = os.environ.get('PORT') or 5000
-    do_cleanup = False
-    datastore_path = None
+    ssl_mode = False
 
     # On Windows, create and use a default path.
     if os.name == 'nt':
@@ -46,7 +48,7 @@ def main():
         datastore_path = os.path.join(os.getcwd(), "../datastore")
 
     try:
-        opts, args = getopt.getopt(sys.argv[1:], "Ccsd:h:p:", "port")
+        opts, args = getopt.getopt(sys.argv[1:], "6Ccsd:h:p:", "port")
     except getopt.GetoptError:
         print('backend.py -s SSL enable -h [host] -p [port] -d [datastore path]')
         sys.exit(2)
@@ -66,6 +68,10 @@ def main():
         if opt == '-d':
             datastore_path = arg
 
+        if opt == '-6':
+            print ("Enabling IPv6 listen support")
+            ipv6_enabled = True
+
         # Cleanup (remove text files that arent in the index)
         if opt == '-c':
             do_cleanup = True
@@ -133,13 +139,15 @@ def main():
         from werkzeug.middleware.proxy_fix import ProxyFix
         app.wsgi_app = ProxyFix(app.wsgi_app, x_prefix=1, x_host=1)
 
+    s_type = socket.AF_INET6 if ipv6_enabled else socket.AF_INET
+
     if ssl_mode:
         # @todo finalise SSL config, but this should get you in the right direction if you need it.
-        eventlet.wsgi.server(eventlet.wrap_ssl(eventlet.listen((host, port), socket.AF_INET6),
+        eventlet.wsgi.server(eventlet.wrap_ssl(eventlet.listen((host, port), s_type),
                                                certfile='cert.pem',
                                                keyfile='privkey.pem',
                                                server_side=True), app)
 
     else:
-        eventlet.wsgi.server(eventlet.listen((host, int(port)), socket.AF_INET6), app)
+        eventlet.wsgi.server(eventlet.listen((host, int(port)), s_type), app)