]> git.ipfire.org Git - ddns.git/blobdiff - src/ddns/providers.py
Merge branch 'nsupdate.info-fixes'
[ddns.git] / src / ddns / providers.py
index acd0253170cacef460799ba39289c7c0bbeb9a41..a57dc8496c32d0f282e7cf4d5a133bb7cdf610d5 100644 (file)
@@ -20,6 +20,7 @@
 ###############################################################################
 
 import logging
+import subprocess
 import urllib2
 import xml.dom.minidom
 
@@ -31,25 +32,49 @@ from .errors import *
 logger = logging.getLogger("ddns.providers")
 logger.propagate = 1
 
+_providers = {}
+
+def get():
+       """
+               Returns a dict with all automatically registered providers.
+       """
+       return _providers.copy()
+
 class DDNSProvider(object):
-       INFO = {
-               # A short string that uniquely identifies
-               # this provider.
-               "handle"    : None,
+       # A short string that uniquely identifies
+       # this provider.
+       handle = None
 
-               # The full name of the provider.
-               "name"      : None,
+       # The full name of the provider.
+       name = None
 
-               # A weburl to the homepage of the provider.
-               # (Where to register a new account?)
-               "website"   : None,
+       # A weburl to the homepage of the provider.
+       # (Where to register a new account?)
+       website = None
 
-               # A list of supported protocols.
-               "protocols" : ["ipv6", "ipv4"],
-       }
+       # A list of supported protocols.
+       protocols = ("ipv6", "ipv4")
 
        DEFAULT_SETTINGS = {}
 
+       # Automatically register all providers.
+       class __metaclass__(type):
+               def __init__(provider, name, bases, dict):
+                       type.__init__(provider, name, bases, dict)
+
+                       # The main class from which is inherited is not registered
+                       # as a provider.
+                       if name == "DDNSProvider":
+                               return
+
+                       if not all((provider.handle, provider.name, provider.website)):
+                               raise DDNSError(_("Provider is not properly configured"))
+
+                       assert not _providers.has_key(provider.handle), \
+                               "Provider '%s' has already been registered" % provider.handle
+
+                       _providers[provider.handle] = provider
+
        def __init__(self, core, **settings):
                self.core = core
 
@@ -64,28 +89,6 @@ class DDNSProvider(object):
        def __cmp__(self, other):
                return cmp(self.hostname, other.hostname)
 
-       @property
-       def name(self):
-               """
-                       Returns the name of the provider.
-               """
-               return self.INFO.get("name")
-
-       @property
-       def website(self):
-               """
-                       Returns the website URL of the provider
-                       or None if that is not available.
-               """
-               return self.INFO.get("website", None)
-
-       @property
-       def handle(self):
-               """
-                       Returns the handle of this provider.
-               """
-               return self.INFO.get("handle")
-
        def get(self, key, default=None):
                """
                        Get a setting from the settings dictionary.
@@ -113,10 +116,6 @@ class DDNSProvider(object):
                """
                return self.get("password")
 
-       @property
-       def protocols(self):
-               return self.INFO.get("protocols")
-
        @property
        def token(self):
                """
@@ -126,16 +125,20 @@ class DDNSProvider(object):
 
        def __call__(self, force=False):
                if force:
-                       logger.info(_("Updating %s forced") % self.hostname)
+                       logger.debug(_("Updating %s forced") % self.hostname)
 
                # Check if we actually need to update this host.
                elif self.is_uptodate(self.protocols):
-                       logger.info(_("%s is already up to date") % self.hostname)
+                       logger.debug(_("The dynamic host %(hostname)s (%(provider)s) is already up to date") % \
+                               { "hostname" : self.hostname, "provider" : self.name })
                        return
 
                # Execute the update.
                self.update()
 
+               logger.info(_("Dynamic DNS update for %(hostname)s (%(provider)s) successful") % \
+                       { "hostname" : self.hostname, "provider" : self.name })
+
        def update(self):
                raise NotImplementedError
 
@@ -150,6 +153,11 @@ class DDNSProvider(object):
 
                        current_address = self.get_address(proto)
 
+                       # If no addresses for the given protocol exist, we
+                       # are fine...
+                       if current_address is None and not addresses:
+                               continue
+
                        if not current_address in addresses:
                                return False
 
@@ -162,20 +170,101 @@ class DDNSProvider(object):
                """
                return self.core.system.send_request(*args, **kwargs)
 
-       def get_address(self, proto):
+       def get_address(self, proto, default=None):
                """
                        Proxy method to get the current IP address.
                """
-               return self.core.system.get_address(proto)
+               return self.core.system.get_address(proto) or default
+
+
+class DDNSProtocolDynDNS2(object):
+       """
+               This is an abstract class that implements the DynDNS updater
+               protocol version 2. As this is a popular way to update dynamic
+               DNS records, this class is supposed make the provider classes
+               shorter and simpler.
+       """
+
+       # Information about the format of the request is to be found
+       # http://dyn.com/support/developers/api/perform-update/
+       # http://dyn.com/support/developers/api/return-codes/
+
+       def _prepare_request_data(self):
+               data = {
+                       "hostname" : self.hostname,
+                       "myip"     : self.get_address("ipv4"),
+               }
+
+               return data
+
+       def update(self):
+               data = self._prepare_request_data()
+
+               # Send update to the server.
+               response = self.send_request(self.url, data=data,
+                       username=self.username, password=self.password)
+
+               # Get the full response message.
+               output = response.read()
+
+               # Handle success messages.
+               if output.startswith("good") or output.startswith("nochg"):
+                       return
+
+               # Handle error codes.
+               if output == "badauth":
+                       raise DDNSAuthenticationError
+               elif output == "abuse":
+                       raise DDNSAbuseError
+               elif output == "notfqdn":
+                       raise DDNSRequestError(_("No valid FQDN was given."))
+               elif output == "nohost":
+                       raise DDNSRequestError(_("Specified host does not exist."))
+               elif output == "911":
+                       raise DDNSInternalServerError
+               elif output == "dnserr":
+                       raise DDNSInternalServerError(_("DNS error encountered."))
+               elif output == "badagent":
+                       raise DDNSBlockedError
+
+               # If we got here, some other update error happened.
+               raise DDNSUpdateError(_("Server response: %s") % output)
+
+
+class DDNSResponseParserXML(object):
+       """
+               This class provides a parser for XML responses which
+               will be sent by various providers. This class uses the python
+               shipped XML minidom module to walk through the XML tree and return
+               a requested element.
+        """
+
+       def get_xml_tag_value(self, document, content):
+               # Send input to the parser.
+               xmldoc = xml.dom.minidom.parseString(document)
+
+               # Get XML elements by the given content.
+               element = xmldoc.getElementsByTagName(content)
+
+               # If no element has been found, we directly can return None.
+               if not element:
+                       return None
+
+               # Only get the first child from an element, even there are more than one.
+               firstchild = element[0].firstChild
+
+               # Get the value of the child.
+               value = firstchild.nodeValue
+
+               # Return the value.
+               return value
 
 
 class DDNSProviderAllInkl(DDNSProvider):
-       INFO = {
-               "handle"    : "all-inkl.com",
-               "name"      : "All-inkl.com",
-               "website"   : "http://all-inkl.com/",
-               "protocols" : ["ipv4",]
-       }
+       handle    = "all-inkl.com"
+       name      = "All-inkl.com"
+       website   = "http://all-inkl.com/"
+       protocols = ("ipv4",)
 
        # There are only information provided by the vendor how to
        # perform an update on a FRITZ Box. Grab requried informations
@@ -185,19 +274,9 @@ class DDNSProviderAllInkl(DDNSProvider):
        url = "http://dyndns.kasserver.com"
 
        def update(self):
-
                # There is no additional data required so we directly can
                # send our request.
-               try:
-                       # Send request to the server.
-                       response = self.send_request(self.url, username=self.username, password=self.password)
-
-                       # Handle 401 HTTP Header (Authentication Error)
-               except urllib2.HTTPError, e:
-                       if e.code == 401:
-                               raise DDNSAuthenticationError
-
-                       raise
+               response = self.send_request(self.url, username=self.username, password=self.password)
 
                # Get the full response message.
                output = response.read()
@@ -210,16 +289,86 @@ class DDNSProviderAllInkl(DDNSProvider):
                raise DDNSUpdateError
 
 
+class DDNSProviderBindNsupdate(DDNSProvider):
+       handle  = "nsupdate"
+       name    = "BIND nsupdate utility"
+       website = "http://en.wikipedia.org/wiki/Nsupdate"
+
+       DEFAULT_TTL = 60
+
+       def update(self):
+               scriptlet = self.__make_scriptlet()
+
+               # -v enables TCP hence we transfer keys and other data that may
+               # exceed the size of one packet.
+               # -t sets the timeout
+               command = ["nsupdate", "-v", "-t", "60"]
+
+               p = subprocess.Popen(command, shell=True,
+                       stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE,
+               )
+               stdout, stderr = p.communicate(scriptlet)
+
+               if p.returncode == 0:
+                       return
+
+               raise DDNSError("nsupdate terminated with error code: %s\n  %s" % (p.returncode, stderr))
+
+       def __make_scriptlet(self):
+               scriptlet = []
+
+               # Set a different server the update is sent to.
+               server = self.get("server", None)
+               if server:
+                       scriptlet.append("server %s" % server)
+
+               # Set the DNS zone the host should be added to.
+               zone = self.get("zone", None)
+               if zone:
+                       scriptlet.append("zone %s" % zone)
+
+               key = self.get("key", None)
+               if key:
+                       secret = self.get("secret")
+
+                       scriptlet.append("key %s %s" % (key, secret))
+
+               ttl = self.get("ttl", self.DEFAULT_TTL)
+
+               # Perform an update for each supported protocol.
+               for rrtype, proto in (("AAAA", "ipv6"), ("A", "ipv4")):
+                       address = self.get_address(proto)
+                       if not address:
+                               continue
+
+                       scriptlet.append("update delete %s. %s" % (self.hostname, rrtype))
+                       scriptlet.append("update add %s. %s %s %s" % \
+                               (self.hostname, ttl, rrtype, address))
+
+               # Send the actions to the server.
+               scriptlet.append("send")
+               scriptlet.append("quit")
+
+               logger.debug(_("Scriptlet:"))
+               for line in scriptlet:
+                       # Masquerade the line with the secret key.
+                       if line.startswith("key"):
+                               line = "key **** ****"
+
+                       logger.debug("  %s" % line)
+
+               return "\n".join(scriptlet)
+
+
 class DDNSProviderDHS(DDNSProvider):
-       INFO = {
-               "handle"    : "dhs.org",
-               "name"      : "DHS International",
-               "website"   : "http://dhs.org/",
-               "protocols" : ["ipv4",]
-       }
+       handle    = "dhs.org"
+       name      = "DHS International"
+       website   = "http://dhs.org/"
+       protocols = ("ipv4",)
 
        # No information about the used update api provided on webpage,
        # grabed from source code of ez-ipudate.
+
        url = "http://members.dhs.org/nic/hosts"
 
        def update(self):
@@ -239,24 +388,19 @@ class DDNSProviderDHS(DDNSProvider):
                if response.code == 200:
                        return
 
-               # Handle error codes.
-               elif response.code == 401:
-                       raise DDNSAuthenticationError
-
                # If we got here, some other update error happened.
                raise DDNSUpdateError
 
 
 class DDNSProviderDNSpark(DDNSProvider):
-       INFO = {
-               "handle"    : "dnspark.com",
-               "name"      : "DNS Park",
-               "website"   : "http://dnspark.com/",
-               "protocols" : ["ipv4",]
-       }
+       handle    = "dnspark.com"
+       name      = "DNS Park"
+       website   = "http://dnspark.com/"
+       protocols = ("ipv4",)
 
        # Informations to the used api can be found here:
        # https://dnspark.zendesk.com/entries/31229348-Dynamic-DNS-API-Documentation
+
        url = "https://control.dnspark.com/api/dynamic/update.php"
 
        def update(self):
@@ -297,15 +441,14 @@ class DDNSProviderDNSpark(DDNSProvider):
 
 
 class DDNSProviderDtDNS(DDNSProvider):
-       INFO = {
-               "handle"    : "dtdns.com",
-               "name"      : "DtDNS",
-               "website"   : "http://dtdns.com/",
-               "protocols" : ["ipv4",]
-               }
+       handle    = "dtdns.com"
+       name      = "DtDNS"
+       website   = "http://dtdns.com/"
+       protocols = ("ipv4",)
 
        # Information about the format of the HTTPS request is to be found
        # http://www.dtdns.com/dtsite/updatespec
+
        url = "https://www.dtdns.com/api/autodns.cfm"
 
        def update(self):
@@ -351,108 +494,199 @@ class DDNSProviderDtDNS(DDNSProvider):
                raise DDNSUpdateError
 
 
-class DDNSProviderDynDNS(DDNSProvider):
-       INFO = {
-               "handle"    : "dyndns.org",
-               "name"      : "Dyn",
-               "website"   : "http://dyn.com/dns/",
-               "protocols" : ["ipv4",]
-       }
+class DDNSProviderDynDNS(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "dyndns.org"
+       name      = "Dyn"
+       website   = "http://dyn.com/dns/"
+       protocols = ("ipv4",)
 
        # Information about the format of the request is to be found
        # http://http://dyn.com/support/developers/api/perform-update/
        # http://dyn.com/support/developers/api/return-codes/
+
        url = "https://members.dyndns.org/nic/update"
 
+
+class DDNSProviderDynU(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "dynu.com"
+       name      = "Dynu"
+       website   = "http://dynu.com/"
+       protocols = ("ipv6", "ipv4",)
+
+       # Detailed information about the request and response codes
+       # are available on the providers webpage.
+       # http://dynu.com/Default.aspx?page=dnsapi
+
+       url = "https://api.dynu.com/nic/update"
+
        def _prepare_request_data(self):
-               data = {
-                       "hostname" : self.hostname,
-                       "myip"     : self.get_address("ipv4"),
-               }
+               data = DDNSProtocolDynDNS2._prepare_request_data(self)
+
+               # This one supports IPv6
+               myipv6 = self.get_address("ipv6")
+
+               # Add update information if we have an IPv6 address.
+               if myipv6:
+                       data["myipv6"] = myipv6
 
                return data
 
+
+class DDNSProviderEasyDNS(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "easydns.com"
+       name      = "EasyDNS"
+       website   = "http://www.easydns.com/"
+       protocols = ("ipv4",)
+
+       # There is only some basic documentation provided by the vendor,
+       # also searching the web gain very poor results.
+       # http://mediawiki.easydns.com/index.php/Dynamic_DNS
+
+       url = "http://api.cp.easydns.com/dyn/tomato.php"
+
+
+class DDNSProviderDomopoli(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "domopoli.de"
+       name      = "domopoli.de"
+       website   = "http://domopoli.de/"
+       protocols = ("ipv4",)
+
+       # https://www.domopoli.de/?page=howto#DynDns_start
+
+       url = "http://dyndns.domopoli.de/nic/update"
+
+
+class DDNSProviderDynsNet(DDNSProvider):
+       handle    = "dyns.net"
+       name      = "DyNS"
+       website   = "http://www.dyns.net/"
+       protocols = ("ipv4",)
+
+       # There is very detailed informatio about how to send the update request and
+       # the possible response codes. (Currently we are using the v1.1 proto)
+       # http://www.dyns.net/documentation/technical/protocol/
+
+       url = "http://www.dyns.net/postscript011.php"
+
        def update(self):
-               data = self._prepare_request_data()
+               data = {
+                       "ip"       : self.get_address("ipv4"),
+                       "host"     : self.hostname,
+                       "username" : self.username,
+                       "password" : self.password,
+               }
 
                # Send update to the server.
-               response = self.send_request(self.url, data=data,
-                       username=self.username, password=self.password)
+               response = self.send_request(self.url, data=data)
 
                # Get the full response message.
                output = response.read()
 
                # Handle success messages.
-               if output.startswith("good") or output.startswith("nochg"):
+               if output.startswith("200"):
                        return
 
                # Handle error codes.
-               if output == "badauth":
+               if output.startswith("400"):
+                       raise DDNSRequestError(_("Malformed request has been sent."))
+               elif output.startswith("401"):
                        raise DDNSAuthenticationError
-               elif output == "aduse":
-                       raise DDNSAbuseError
-               elif output == "notfqdn":
-                       raise DDNSRequestError(_("No valid FQDN was given."))
-               elif output == "nohost":
-                       raise DDNSRequestError(_("Specified host does not exist."))
-               elif output == "911":
+               elif output.startswith("402"):
+                       raise DDNSRequestError(_("Too frequent update requests have been sent."))
+               elif output.startswith("403"):
                        raise DDNSInternalServerError
-               elif output == "dnserr":
-                       raise DDNSInternalServerError(_("DNS error encountered."))
 
                # If we got here, some other update error happened.
-               raise DDNSUpdateError
+               raise DDNSUpdateError(_("Server response: %s") % output) 
 
 
-class DDNSProviderDynU(DDNSProviderDynDNS):
-       INFO = {
-               "handle"    : "dynu.com",
-               "name"      : "Dynu",
-               "website"   : "http://dynu.com/",
-               "protocols" : ["ipv6", "ipv4",]
-       }
+class DDNSProviderEnomCom(DDNSResponseParserXML, DDNSProvider):
+       handle    = "enom.com"
+       name      = "eNom Inc."
+       website   = "http://www.enom.com/"
 
+       # There are very detailed information about how to send an update request and
+       # the respone codes.
+       # http://www.enom.com/APICommandCatalog/
 
-       # Detailed information about the request and response codes
-       # are available on the providers webpage.
-       # http://dynu.com/Default.aspx?page=dnsapi
+       url = "https://dynamic.name-services.com/interface.asp"
 
-       url = "https://api.dynu.com/nic/update"
+       def update(self):
+               data = {
+                       "command"        : "setdnshost",
+                       "responsetype"   : "xml",
+                       "address"        : self.get_address("ipv4"),
+                       "domainpassword" : self.password,
+                       "zone"           : self.hostname
+               }
 
-       def _prepare_request_data(self):
-               data = DDNSProviderDynDNS._prepare_request_data(self)
+               # Send update to the server.
+               response = self.send_request(self.url, data=data)
 
-               # This one supports IPv6
-               data.update({
-                       "myipv6"   : self.get_address("ipv6"),
-               })
+               # Get the full response message.
+               output = response.read()
 
-               return data
+               # Handle success messages.
+               if self.get_xml_tag_value(output, "ErrCount") == "0":
+                       return
 
+               # Handle error codes.
+               errorcode = self.get_xml_tag_value(output, "ResponseNumber")
 
-class DDNSProviderEasyDNS(DDNSProviderDynDNS):
-       INFO = {
-               "handle"    : "easydns.com",
-               "name"      : "EasyDNS",
-               "website"   : "http://www.easydns.com/",
-               "protocols" : ["ipv4",]
-       }
+               if errorcode == "304155":
+                       raise DDNSAuthenticationError
+               elif errorcode == "304153":
+                       raise DDNSRequestError(_("Domain not found."))
 
-       # There is only some basic documentation provided by the vendor,
-       # also searching the web gain very poor results.
-       # http://mediawiki.easydns.com/index.php/Dynamic_DNS
+               # If we got here, some other update error happened.
+               raise DDNSUpdateError
 
-       url = "http://api.cp.easydns.com/dyn/tomato.php"
 
+class DDNSProviderEntryDNS(DDNSProvider):
+       handle    = "entrydns.net"
+       name      = "EntryDNS"
+       website   = "http://entrydns.net/"
+       protocols = ("ipv4",)
 
-class DDNSProviderFreeDNSAfraidOrg(DDNSProvider):
-       INFO = {
-               "handle"    : "freedns.afraid.org",
-               "name"      : "freedns.afraid.org",
-               "website"   : "http://freedns.afraid.org/",
-               "protocols" : ["ipv6", "ipv4",]
+       # Some very tiny details about their so called "Simple API" can be found
+       # here: https://entrydns.net/help
+       url = "https://entrydns.net/records/modify"
+
+       def update(self):
+               data = {
+                       "ip" : self.get_address("ipv4")
                }
 
+               # Add auth token to the update url.
+               url = "%s/%s" % (self.url, self.token)
+
+               # Send update to the server.
+               try:
+                       response = self.send_request(url, data=data)
+
+               # Handle error codes
+               except urllib2.HTTPError, e:
+                       if e.code == 404:
+                               raise DDNSAuthenticationError
+
+                       elif e.code == 422:
+                               raise DDNSRequestError(_("An invalid IP address was submitted"))
+
+                       raise
+
+               # Handle success messages.
+               if response.code == 200:
+                       return
+
+               # If we got here, some other update error happened.
+               raise DDNSUpdateError
+
+
+class DDNSProviderFreeDNSAfraidOrg(DDNSProvider):
+       handle    = "freedns.afraid.org"
+       name      = "freedns.afraid.org"
+       website   = "http://freedns.afraid.org/"
+
        # No information about the request or response could be found on the vendor
        # page. All used values have been collected by testing.
        url = "https://freedns.afraid.org/dynamic/update.php"
@@ -474,6 +708,10 @@ class DDNSProviderFreeDNSAfraidOrg(DDNSProvider):
                # Send update to the server.
                response = self.send_request(url, data=data)
 
+               # Get the full response message.
+               output = response.read()
+
+               # Handle success messages.
                if output.startswith("Updated") or "has not changed" in output:
                        return
 
@@ -483,38 +721,27 @@ class DDNSProviderFreeDNSAfraidOrg(DDNSProvider):
                elif "is an invalid IP address" in output:
                        raise DDNSRequestError(_("Invalid IP address has been sent."))
 
+               # If we got here, some other update error happened.
+               raise DDNSUpdateError
+
 
 class DDNSProviderLightningWireLabs(DDNSProvider):
-       INFO = {
-               "handle"    : "dns.lightningwirelabs.com",
-               "name"      : "Lightning Wire Labs",
-               "website"   : "http://dns.lightningwirelabs.com/",
-               "protocols" : ["ipv6", "ipv4",]
-       }
+       handle    = "dns.lightningwirelabs.com"
+       name      = "Lightning Wire Labs DNS Service"
+       website   = "http://dns.lightningwirelabs.com/"
 
        # Information about the format of the HTTPS request is to be found
        # https://dns.lightningwirelabs.com/knowledge-base/api/ddns
+
        url = "https://dns.lightningwirelabs.com/update"
 
        def update(self):
                data =  {
                        "hostname" : self.hostname,
+                       "address6" : self.get_address("ipv6", "-"),
+                       "address4" : self.get_address("ipv4", "-"),
                }
 
-               # Check if we update an IPv6 address.
-               address6 = self.get_address("ipv6")
-               if address6:
-                       data["address6"] = address6
-
-               # Check if we update an IPv4 address.
-               address4 = self.get_address("ipv4")
-               if address4:
-                       data["address4"] = address4
-
-               # Raise an error if none address is given.
-               if not data.has_key("address6") and not data.has_key("address4"):
-                       raise DDNSConfigurationError
-
                # Check if a token has been set.
                if self.token:
                        data["token"] = self.token
@@ -537,23 +764,15 @@ class DDNSProviderLightningWireLabs(DDNSProvider):
                if response.code == 200:
                        return
 
-               # Handle error codes.
-               if response.code == 403:
-                       raise DDNSAuthenticationError
-               elif response.code == 400:
-                       raise DDNSRequestError
-
                # If we got here, some other update error happened.
                raise DDNSUpdateError
 
 
-class DDNSProviderNamecheap(DDNSProvider):
-       INFO = {
-               "handle"    : "namecheap.com",
-               "name"      : "Namecheap",
-               "website"   : "http://namecheap.com",
-               "protocols" : ["ipv4",]
-       }
+class DDNSProviderNamecheap(DDNSResponseParserXML, DDNSProvider):
+       handle    = "namecheap.com"
+       name      = "Namecheap"
+       website   = "http://namecheap.com"
+       protocols = ("ipv4",)
 
        # Information about the format of the HTTP request is to be found
        # https://www.namecheap.com/support/knowledgebase/article.aspx/9249/0/nc-dynamic-dns-to-dyndns-adapter
@@ -561,26 +780,6 @@ class DDNSProviderNamecheap(DDNSProvider):
 
        url = "https://dynamicdns.park-your-domain.com/update"
 
-       def parse_xml(self, document, content):
-               # Send input to the parser.
-               xmldoc = xml.dom.minidom.parseString(document)
-
-               # Get XML elements by the given content.
-               element = xmldoc.getElementsByTagName(content)
-
-               # If no element has been found, we directly can return None.
-               if not element:
-                       return None
-
-               # Only get the first child from an element, even there are more than one.
-               firstchild = element[0].firstChild
-
-               # Get the value of the child.
-               value = firstchild.nodeValue
-
-               # Return the value.
-               return value
-               
        def update(self):
                # Namecheap requires the hostname splitted into a host and domain part.
                host, domain = self.hostname.split(".", 1)
@@ -599,11 +798,11 @@ class DDNSProviderNamecheap(DDNSProvider):
                output = response.read()
 
                # Handle success messages.
-               if self.parse_xml(output, "IP") == self.get_address("ipv4"):
+               if self.get_xml_tag_value(output, "IP") == self.get_address("ipv4"):
                        return
 
                # Handle error codes.
-               errorcode = self.parse_xml(output, "ResponseNumber")
+               errorcode = self.get_xml_tag_value(output, "ResponseNumber")
 
                if errorcode == "304156":
                        raise DDNSAuthenticationError
@@ -618,13 +817,11 @@ class DDNSProviderNamecheap(DDNSProvider):
                raise DDNSUpdateError
 
 
-class DDNSProviderNOIP(DDNSProviderDynDNS):
-       INFO = {
-               "handle"    : "no-ip.com",
-               "name"      : "No-IP",
-               "website"   : "http://www.no-ip.com/",
-               "protocols" : ["ipv4",]
-       }
+class DDNSProviderNOIP(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "no-ip.com"
+       name      = "No-IP"
+       website   = "http://www.no-ip.com/"
+       protocols = ("ipv4",)
 
        # Information about the format of the HTTP request is to be found
        # here: http://www.no-ip.com/integrate/request and
@@ -641,13 +838,77 @@ class DDNSProviderNOIP(DDNSProviderDynDNS):
                return data
 
 
-class DDNSProviderOVH(DDNSProviderDynDNS):
-       INFO = {
-               "handle"    : "ovh.com",
-               "name"      : "OVH",
-               "website"   : "http://www.ovh.com/",
-               "protocols" : ["ipv4",]
-       }
+class DDNSProviderNsupdateINFO(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "nsupdate.info"
+       name      = "nsupdate.info"
+       website   = "http://nsupdate.info/"
+       protocols = ("ipv6", "ipv4",)
+
+       # Information about the format of the HTTP request can be found
+       # after login on the provider user interface and here:
+       # http://nsupdateinfo.readthedocs.org/en/latest/user.html
+
+       # Nsupdate.info uses the hostname as user part for the HTTP basic auth,
+       # and for the password a so called secret.
+       @property
+       def username(self):
+               return self.get("hostname")
+
+       @property
+       def password(self):
+               return self.get("secret")
+
+       @property
+       def proto(self):
+               return self.get("proto")
+
+       @property
+       def url(self):
+               # The update URL is different by the used protocol.
+               if self.proto == "ipv4":
+                       return "https://ipv4.nsupdate.info/nic/update"
+               elif self.proto == "ipv6":
+                       return "https://ipv6.nsupdate.info/nic/update"
+               else:
+                       raise DDNSUpdateError(_("Invalid protocol has been given"))
+
+       def _prepare_request_data(self):
+               data = {
+                       "myip" : self.get_address(self.proto),
+               }
+
+               return data
+
+
+class DDNSProviderOpenDNS(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "opendns.com"
+       name      = "OpenDNS"
+       website   = "http://www.opendns.com"
+
+       # Detailed information about the update request and possible
+       # response codes can be obtained from here:
+       # https://support.opendns.com/entries/23891440
+
+       url = "https://updates.opendns.com/nic/update"
+
+       @property
+       def proto(self):
+               return self.get("proto")
+
+       def _prepare_request_data(self):
+               data = {
+                       "hostname" : self.hostname,
+                       "myip"     : self.get_address(self.proto)
+               }
+
+               return data
+
+
+class DDNSProviderOVH(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "ovh.com"
+       name      = "OVH"
+       website   = "http://www.ovh.com/"
+       protocols = ("ipv4",)
 
        # OVH only provides very limited information about how to
        # update a DynDNS host. They only provide the update url
@@ -658,7 +919,7 @@ class DDNSProviderOVH(DDNSProviderDynDNS):
        url = "https://www.ovh.com/nic/update"
 
        def _prepare_request_data(self):
-               data = DDNSProviderDynDNS._prepare_request_data(self)
+               data = DDNSProtocolDynDNS2._prepare_request_data(self)
                data.update({
                        "system" : "dyndns",
                })
@@ -667,12 +928,9 @@ class DDNSProviderOVH(DDNSProviderDynDNS):
 
 
 class DDNSProviderRegfish(DDNSProvider):
-       INFO = {
-               "handle"    : "regfish.com",
-               "name"      : "Regfish GmbH",
-               "website"   : "http://www.regfish.com/",
-               "protocols" : ["ipv6", "ipv4",]
-       }
+       handle  = "regfish.com"
+       name    = "Regfish GmbH"
+       website = "http://www.regfish.com/"
 
        # A full documentation to the providers api can be found here
        # but is only available in german.
@@ -740,37 +998,28 @@ class DDNSProviderRegfish(DDNSProvider):
                raise DDNSUpdateError
 
 
-class DDNSProviderSelfhost(DDNSProvider):
-       INFO = {
-               "handle"    : "selfhost.de",
-               "name"      : "Selfhost.de",
-               "website"   : "http://www.selfhost.de/",
-               "protocols" : ["ipv4",],
-       }
+class DDNSProviderSelfhost(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "selfhost.de"
+       name      = "Selfhost.de"
+       website   = "http://www.selfhost.de/"
+       protocols = ("ipv4",)
 
-       url = "https://carol.selfhost.de/update"
-
-       def update(self):
-               data = {
-                       "username" : self.username,
-                       "password" : self.password,
-                       "textmodi" : "1",
-               }
+       url = "https://carol.selfhost.de/nic/update"
 
-               response = self.send_request(self.url, data=data)
+       def _prepare_request_data(self):
+               data = DDNSProtocolDynDNS2._prepare_request_data(self)
+               data.update({
+                       "hostname" : "1",
+               })
 
-               match = re.search("status=20(0|4)", response.read())
-               if not match:
-                       raise DDNSUpdateError
+               return data
 
 
-class DDNSProviderSPDNS(DDNSProviderDynDNS):
-       INFO = {
-               "handle"    : "spdns.org",
-               "name"      : "SPDNS",
-               "website"   : "http://spdns.org/",
-               "protocols" : ["ipv4",]
-       }
+class DDNSProviderSPDNS(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "spdns.org"
+       name      = "SPDNS"
+       website   = "http://spdns.org/"
+       protocols = ("ipv4",)
 
        # Detailed information about request and response codes are provided
        # by the vendor. They are using almost the same mechanism and status
@@ -781,14 +1030,65 @@ class DDNSProviderSPDNS(DDNSProviderDynDNS):
 
        url = "https://update.spdns.de/nic/update"
 
+       @property
+       def username(self):
+               return self.get("username") or self.hostname
+
+       @property
+       def password(self):
+               return self.get("username") or self.token
+
+
+class DDNSProviderStrato(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "strato.com"
+       name      = "Strato AG"
+       website   = "http:/www.strato.com/"
+       protocols = ("ipv4",)
+
+       # Information about the request and response can be obtained here:
+       # http://www.strato-faq.de/article/671/So-einfach-richten-Sie-DynDNS-f%C3%BCr-Ihre-Domains-ein.html
+
+       url = "https://dyndns.strato.com/nic/update"
 
-class DDNSProviderVariomedia(DDNSProviderDynDNS):
-       INFO = {
-               "handle"   : "variomedia.de",
-               "name"     : "Variomedia",
-               "website"  : "http://www.variomedia.de/",
-               "protocols" : ["ipv6", "ipv4",]
-       }
+
+class DDNSProviderTwoDNS(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "twodns.de"
+       name      = "TwoDNS"
+       website   = "http://www.twodns.de"
+       protocols = ("ipv4",)
+
+       # Detailed information about the request can be found here
+       # http://twodns.de/en/faqs
+       # http://twodns.de/en/api
+
+       url = "https://update.twodns.de/update"
+
+       def _prepare_request_data(self):
+               data = {
+                       "ip" : self.get_address("ipv4"),
+                       "hostname" : self.hostname
+               }
+
+               return data
+
+
+class DDNSProviderUdmedia(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "udmedia.de"
+       name      = "Udmedia GmbH"
+       website   = "http://www.udmedia.de"
+       protocols = ("ipv4",)
+
+       # Information about the request can be found here
+       # http://www.udmedia.de/faq/content/47/288/de/wie-lege-ich-einen-dyndns_eintrag-an.html
+
+       url = "https://www.udmedia.de/nic/update"
+
+
+class DDNSProviderVariomedia(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "variomedia.de"
+       name      = "Variomedia"
+       website   = "http://www.variomedia.de/"
+       protocols = ("ipv6", "ipv4",)
 
        # Detailed information about the request can be found here
        # https://dyndns.variomedia.de/
@@ -806,3 +1106,49 @@ class DDNSProviderVariomedia(DDNSProviderDynDNS):
                }
 
                return data
+
+
+class DDNSProviderZoneedit(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "zoneedit.com"
+       name      = "Zoneedit"
+       website   = "http://www.zoneedit.com"
+       protocols = ("ipv4",)
+
+       # Detailed information about the request and the response codes can be
+       # obtained here:
+       # http://www.zoneedit.com/doc/api/other.html
+       # http://www.zoneedit.com/faq.html
+
+       url = "https://dynamic.zoneedit.com/auth/dynamic.html"
+
+       @property
+       def proto(self):
+               return self.get("proto")
+
+       def update(self):
+               data = {
+                       "dnsto" : self.get_address(self.proto),
+                       "host"  : self.hostname
+               }
+
+               # Send update to the server.
+               response = self.send_request(self.url, username=self.username, password=self.password,
+                       data=data)
+
+               # Get the full response message.
+               output = response.read()
+
+               # Handle success messages.
+               if output.startswith("<SUCCESS"):
+                       return
+
+               # Handle error codes.
+               if output.startswith("invalid login"):
+                       raise DDNSAuthenticationError
+               elif output.startswith("<ERROR CODE=\"704\""):
+                       raise DDNSRequestError(_("No valid FQDN was given.")) 
+               elif output.startswith("<ERROR CODE=\"702\""):
+                       raise DDNSInternalServerError
+
+               # If we got here, some other update error happened.
+               raise DDNSUpdateError