home.router: let dyndns have ipv6 please

bundles/pppd/files/dyndns

@@ -1,24 +1,59 @@
 #!/usr/bin/env python3
 
-from sys import argv
+import logging
+from ipaddress import ip_address
+from json import loads
+from subprocess import check_output
 
-import requests
+from requests import get
 
-INTERFACE = argv[1]
-LOCAL_IP = argv[4]
 
 UPDATE_URL = '${url}'
 USERNAME = '${username}'
 PASSWORD = '${password}'
 
-r = requests.get(
-    UPDATE_URL.format(
-        ip=LOCAL_IP,
-    ),
-    auth=(
-        USERNAME,
-        PASSWORD,
-    )
-)
+# <%text>
+logging.basicConfig(level=logging.INFO)
+LOG = logging.getLogger('DynDNS')
+try:
+    ips = set()
 
-print('got status {} when updating dns'.format(r.status_code))
+    iproute = loads(check_output(['ip', '-json', 'address', 'show', 'scope', 'global']))
+
+    for iface in iproute:
+        if not iface['ifname'].startswith('ppp'):
+            LOG.debug(f'ignoring {iface["ifname"]}')
+            continue
+
+        LOG.info(f'working on {iface["ifname"]}')
+        for ip in iface['addr_info']:
+            try:
+                addr = ip_address(ip['local'])
+
+                LOG.info(f'{iface["ifname"]} has ip {addr.compressed}')
+                ips.add(addr.compressed)
+            except Exception:
+                continue
+
+        if ips:
+            LOG.info('got some addresses!')
+            break
+
+    url = UPDATE_URL.format(
+        ips=','.join(sorted(ips))
+    )
+
+    LOG.info(url)
+
+    r = get(
+        url,
+        auth=(
+            USERNAME,
+            PASSWORD,
+        ),
+    )
+    r.raise_for_status()
+except Exception as e:
+    logging.exception(e)
+
+# </%text>