Support ipprefix via argument

Fixes #353

CHANGES.rst

@@ -17,6 +17,7 @@ New Features:
   without causing database accesses.
 - django-admin faults: show/reset api auth faults counter
 - add api_auth_faults column to django admin's Hosts view
+- support ipprefix argument to pass the netmask and prefix for related domains explicitly
 
 Fixes:
 
@@ -327,7 +328,7 @@ Other changes:
   you can use custom templates for this)
 * added some ugly logos (if you can do better ones, please help)
   https://github.com/nsupdate-info/nsupdate.info/issues/78
-* replaced "SSL" by "TLS" everywhere.      
+* replaced "SSL" by "TLS" everywhere.
   SSL is the old/outdated name. Since 1999, it's called TLS.
 * updated to latest versions on CDN: jquery, bootstrap, font-awesome
 

src/nsupdate/api/_tests/test_api.py

@@ -150,6 +150,18 @@ def test_nic_update_authorized_myip_v4(client):
     # now check if it updated the ipv4 related hosts also:
     assert query_ns(TEST_HOST_RELATED, 'A') == '1.2.3.1'  # 1.2.3.4/29 + 0.0.0.1
 
+    # custom prefix (with custom netmask)
+    response = client.get(reverse('nic_update') + '?myip=4.3.2.1&ipprefix=1.2.3.4/8',
+                          HTTP_AUTHORIZATION=make_basic_auth_header(TEST_HOST, TEST_SECRET))
+    assert response.status_code == 200
+    assert query_ns(TEST_HOST_RELATED, 'A') == '1.0.0.1'  # 1.2.3.4/29 + 0.0.0.1
+
+    # mismatching prefix type
+    response = client.get(reverse('nic_update') + '?myip=4.3.2.1&ipprefix=3000::/16',
+                          HTTP_AUTHORIZATION=make_basic_auth_header(TEST_HOST, TEST_SECRET))
+    assert response.status_code == 200
+    assert response.content == b'dnserr'
+
 
 def test_nic_update_authorized_myip_v6(client):
     response = client.get(reverse('nic_update') + '?myip=2000::2',
@@ -170,6 +182,18 @@ def test_nic_update_authorized_myip_v6(client):
     # now check if it updated the ipv4 related hosts also:
     assert query_ns(TEST_HOST_RELATED, 'AAAA') == '2000::1'  # 2000::3/64 + ::1
 
+    # custom prefix (with custom netmask)
+    response = client.get(reverse('nic_update') + '?myip=2000::4&ipprefix=3000:ffff:ffff::/16',
+                          HTTP_AUTHORIZATION=make_basic_auth_header(TEST_HOST, TEST_SECRET))
+    assert response.status_code == 200
+    assert query_ns(TEST_HOST_RELATED, 'AAAA') == '3000::1'  # 3000::/16 + ::1
+
+    # mismatching prefix type
+    response = client.get(reverse('nic_update') + '?myip=2000::4&ipprefix=127.0.0.1/16',
+                          HTTP_AUTHORIZATION=make_basic_auth_header(TEST_HOST, TEST_SECRET))
+    assert response.status_code == 200
+    assert response.content == b'dnserr'
+
 
 @pytest.mark.requires_sequential
 def test_nic_update_authorized_update_other_services(client):

src/nsupdate/api/views.py

@@ -251,8 +251,9 @@ def get(self, request, logger=None, delete=False):
         ipaddr = request.GET.get('myip')
         if not ipaddr:  # None or ''
             ipaddr = normalize_ip(request.META.get('REMOTE_ADDR'))
+        ipprefix = request.GET.get('ipprefix')
         secure = request.is_secure()
-        return _update_or_delete(host, ipaddr, secure, logger=logger, _delete=delete)
+        return _update_or_delete(host, ipaddr, secure, ipprefix=ipprefix, logger=logger, _delete=delete)
 
 
 class NicDeleteView(NicUpdateView):
@@ -306,8 +307,9 @@ def get(self, request, logger=None, delete=False):
         ipaddr = request.GET.get('myip')
         if not ipaddr:  # None or empty string
             ipaddr = normalize_ip(request.META.get('REMOTE_ADDR'))
+        ipprefix = request.GET.get('ipprefix')
         secure = request.is_secure()
-        return _update_or_delete(host, ipaddr, secure, logger=logger, _delete=delete)
+        return _update_or_delete(host, ipaddr, secure, ipprefix=ipprefix, logger=logger, _delete=delete)
 
 
 class AuthorizedNicDeleteView(AuthorizedNicUpdateView):
@@ -323,12 +325,13 @@ def get(self, request, logger=None, delete=True):
         return super(AuthorizedNicDeleteView, self).get(request, logger=logger, delete=delete)
 
 
-def _update_or_delete(host, ipaddr, secure=False, logger=None, _delete=False):
+def _update_or_delete(host, ipaddr, secure=False, ipprefix=None, logger=None, _delete=False):
     """
     common code shared by the 2 update/delete views
 
     :param host: host object
     :param ipaddr: ip addr (v4 or v6)
+    :param ipprefix: ip6 prefix/netmask (v4 or v6, must be of same kind as ipaddr)
     :param secure: True if we use TLS/https
     :param logger: a logger object
     :param _delete: True for delete, False for update
@@ -362,6 +365,13 @@ def _update_or_delete(host, ipaddr, secure=False, logger=None, _delete=False):
         kind = check_ip(ipaddr, ('ipv4', 'ipv6'))
         rdtype = 'A' if kind == 'ipv4' else 'AAAA'
         IPNetwork(ipaddr)  # raise AddrFormatError here if there is an issue with ipaddr, see #394
+        if ipprefix:
+            ipprefix = str(ipprefix)
+            # do not allow to mix the kinds
+            network = IPNetwork(ipprefix)
+            if check_ip(str(network.ip)) != kind:
+                logger.warning("network kind of prefix is wrong")
+                raise ValueError("invalid kind")
     except (ValueError, UnicodeError, AddrFormatError):
         # invalid ip address string
         # some people manage to even give a non-ascii string instead of an ip addr
@@ -405,29 +415,32 @@ def _update_or_delete(host, ipaddr, secure=False, logger=None, _delete=False):
             # XXX unclear what to do for "other services" we relay updates to
             return Response('deleted %s' % rdtype)
         else:  # update
-            _on_update_success(host, fqdn, kind, ipaddr, secure, logger)
+            _on_update_success(host, fqdn, kind, ipaddr, ipprefix, secure, logger)
             return Response('good %s' % ipaddr)
 
 
-def _on_update_success(host, fqdn, kind, ipaddr, secure, logger):
+def _on_update_success(host, fqdn, kind, ipaddr, ipprefix, secure, logger):
     """after updating the host in dns, do related other updates"""
     # update related hosts
+
+    if ipprefix:
+        network = IPNetwork(ipprefix)
+    else:
+        netmask = host.netmask_ipv4 if kind == 'ipv4' else host.netmask_ipv6
+        network = IPNetwork("%s/%d" % (ipaddr, netmask))
     rdtype = 'A' if kind == 'ipv4' else 'AAAA'
     for rh in host.relatedhosts.all():
         if rh.available:
             if kind == 'ipv4':
                 ifid = rh.interface_id_ipv4
-                netmask = host.netmask_ipv4
             else:  # kind == 'ipv6':
                 ifid = rh.interface_id_ipv6
-                netmask = host.netmask_ipv6
             ifid = ifid.strip() if ifid else ifid
             _delete = not ifid  # leave ifid empty if you don't want this rh record
             try:
                 rh_fqdn = FQDN(rh.name + '.' + fqdn.host, fqdn.domain)
                 if not _delete:
                     ifid = IPAddress(ifid)
-                    network = IPNetwork("%s/%d" % (ipaddr, netmask))
                     rh_ipaddr = str(IPAddress(network.network) + int(ifid))
             except (IndexError, AddrFormatError, ValueError) as e:
                 logger.warning("trouble computing address of related host %s [%s]" % (rh, e))

src/nsupdate/main/templates/main/includes/tabbed_router_configuration.html

@@ -125,7 +125,7 @@ <h5>{% trans "Enter the following data:" %}</h5>
         </table>
         <h5>{% trans "If you have IPv4 and IPv6" %}</h5>
         {% trans "Set Update-URL to the following (two URLs, separated by one space)" %}
-        <div class="well well-sm">https://{{ WWW_IPV4_HOST }}/nic/update https://{{ WWW_IPV6_HOST }}/nic/update</div>
+        <div class="well well-sm">https://{{ WWW_IPV4_HOST }}/nic/update https://{{ WWW_IPV6_HOST }}/nic/update?ipprefix=&lt;ip6lanprefix&gt;</div>
         <h5>{% trans "Forcing a dynamic DNS update" %}</h5>
         {% trans "If you want to force a dynamic update for testing purposes, you can do it like this:" %}
         <ul>