]> git.ipfire.org Git - ddns.git/blobdiff - src/ddns/providers.py
nsupdate.info: Don't repeat failed updates
[ddns.git] / src / ddns / providers.py
index 605b65ea238fd5d918faf11fe8a289802cffb29c..1e88995962d8343288a582084d3012833f6ee355 100644 (file)
 #                                                                             #
 ###############################################################################
 
+import datetime
 import logging
+import os
+import subprocess
+import urllib2
+import xml.dom.minidom
 
 from i18n import _
 
@@ -29,25 +34,69 @@ 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 = {}
 
+       # holdoff time - Number of days no update is performed unless
+       # the IP address has changed.
+       holdoff_days = 30
+
+       # holdoff time for update failures - Number of days no update
+       # is tried after the last one has failed.
+       holdoff_failure_days = 0.5
+
+       # True if the provider is able to remove records, too.
+       # Required to remove AAAA records if IPv6 is absent again.
+       can_remove_records = True
+
+       # 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
+
+       @staticmethod
+       def supported():
+               """
+                       Should be overwritten to check if the system the code is running
+                       on has all the required tools to support this provider.
+               """
+               return True
+
        def __init__(self, core, **settings):
                self.core = core
 
@@ -63,26 +112,8 @@ class DDNSProvider(object):
                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 db(self):
+               return self.core.db
 
        def get(self, key, default=None):
                """
@@ -112,25 +143,118 @@ class DDNSProvider(object):
                return self.get("password")
 
        @property
-       def protocols(self):
-               return self.INFO.get("protocols")
+       def token(self):
+               """
+                       Fast access to the token.
+               """
+               return self.get("token")
 
        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)
+               # Do nothing if the last update has failed or no update is required
+               elif self.has_failure or not self.requires_update:
                        return
 
                # Execute the update.
-               self.update()
+               try:
+                       self.update()
+
+               # In case of any errors, log the failed request and
+               # raise the exception.
+               except DDNSError as e:
+                       self.core.db.log_failure(self.hostname, e)
+                       raise
+
+               logger.info(_("Dynamic DNS update for %(hostname)s (%(provider)s) successful") % \
+                       { "hostname" : self.hostname, "provider" : self.name })
+               self.core.db.log_success(self.hostname)
 
        def update(self):
+               for protocol in self.protocols:
+                       if self.have_address(protocol):
+                               self.update_protocol(protocol)
+                       elif self.can_remove_records:
+                               self.remove_protocol(protocol)
+
+       def update_protocol(self, proto):
+               raise NotImplementedError
+
+       def remove_protocol(self, proto):
+               if not self.can_remove_records:
+                       raise RuntimeError, "can_remove_records is enabled, but remove_protocol() not implemented"
+
                raise NotImplementedError
 
-       def is_uptodate(self, protos):
+       @property
+       def requires_update(self):
+               # If the IP addresses have changed, an update is required
+               if self.ip_address_changed(self.protocols):
+                       logger.debug(_("An update for %(hostname)s (%(provider)s)"
+                               " is performed because of an IP address change") % \
+                               { "hostname" : self.hostname, "provider" : self.name })
+
+                       return True
+
+               # If the holdoff time has expired, an update is required, too
+               if self.holdoff_time_expired():
+                       logger.debug(_("An update for %(hostname)s (%(provider)s)"
+                               " is performed because the holdoff time has expired") % \
+                               { "hostname" : self.hostname, "provider" : self.name })
+
+                       return True
+
+               # Otherwise, we don't need to perform an update
+               logger.debug(_("No update required for %(hostname)s (%(provider)s)") % \
+                       { "hostname" : self.hostname, "provider" : self.name })
+
+               return False
+
+       @property
+       def has_failure(self):
+               """
+                       Returns True when the last update has failed and no retry
+                       should be performed, yet.
+               """
+               last_status = self.db.last_update_status(self.hostname)
+
+               # Return False if the last update has not failed.
+               if not last_status == "failure":
+                       return False
+
+               # If there is no holdoff time, we won't update ever again.
+               if self.holdoff_failure_days is None:
+                       logger.warning(_("An update has not been performed because earlier updates failed for %s") \
+                               % self.hostname)
+                       logger.warning(_("There will be no retries"))
+
+                       return True
+
+               # Determine when the holdoff time ends
+               last_update = self.db.last_update(self.hostname, status=last_status)
+               holdoff_end = last_update + datetime.timedelta(days=self.holdoff_failure_days)
+
+               now = datetime.datetime.utcnow()
+               if now < holdoff_end:
+                       failure_message = self.db.last_update_failure_message(self.hostname)
+
+                       logger.warning(_("An update has not been performed because earlier updates failed for %s") \
+                               % self.hostname)
+
+                       if failure_message:
+                               logger.warning(_("Last failure message:"))
+
+                               for line in failure_message.splitlines():
+                                       logger.warning("  %s" % line)
+
+                       logger.warning(_("Further updates will be withheld until %s") % holdoff_end)
+
+                       return True
+
+               return False
+
+       def ip_address_changed(self, protos):
                """
                        Returns True if this host is already up to date
                        and does not need to change the IP address on the
@@ -138,13 +262,53 @@ class DDNSProvider(object):
                """
                for proto in protos:
                        addresses = self.core.system.resolve(self.hostname, proto)
-
                        current_address = self.get_address(proto)
 
+                       # Handle if the system has not got any IP address from a protocol
+                       # (i.e. had full dual-stack connectivity which it has not any more)
+                       if current_address is None:
+                               # If addresses still exists in the DNS system and if this provider
+                               # is able to remove records, we will do that.
+                               if addresses and self.can_remove_records:
+                                       return True
+
+                               # Otherwise, we cannot go on...
+                               continue
+
                        if not current_address in addresses:
-                               return False
+                               return True
 
-               return True
+               return False
+
+       def holdoff_time_expired(self):
+               """
+                       Returns true if the holdoff time has expired
+                       and the host requires an update
+               """
+               # If no holdoff days is defined, we cannot go on
+               if not self.holdoff_days:
+                       return False
+
+               # Get the timestamp of the last successfull update
+               last_update = self.db.last_update(self.hostname, status="success")
+
+               # If no timestamp has been recorded, no update has been
+               # performed. An update should be performed now.
+               if not last_update:
+                       return True
+
+               # Determine when the holdoff time ends
+               holdoff_end = last_update + datetime.timedelta(days=self.holdoff_days)
+
+               now = datetime.datetime.utcnow()
+
+               if now >= holdoff_end:
+                       logger.debug("The holdoff time has expired for %s" % self.hostname)
+                       return True
+               else:
+                       logger.debug("Updates for %s are held off until %s" % \
+                               (self.hostname, holdoff_end))
+                       return False
 
        def send_request(self, *args, **kwargs):
                """
@@ -153,80 +317,281 @@ 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
+
+       def have_address(self, proto):
+               """
+                       Returns True if an IP address for the given protocol
+                       is known and usable.
+               """
+               address = self.get_address(proto)
+
+               if address:
+                       return True
+
+               return False
+
+
+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/
+
+       # The DynDNS protocol version 2 does not allow to remove records
+       can_remove_records = False
+
+       def prepare_request_data(self, proto):
+               data = {
+                       "hostname" : self.hostname,
+                       "myip"     : self.get_address(proto),
+               }
+
+               return data
+
+       def update_protocol(self, proto):
+               data = self.prepare_request_data(proto)
+
+               return self.send_request(data)
+
+       def send_request(self, data):
+               # Send update to the server.
+               response = DDNSProvider.send_request(self, 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):
+       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
+       # from the net.
+       # http://all-inkl.goetze.it/v01/ddns-mit-einfachen-mitteln/
+
+       url = "http://dyndns.kasserver.com"
+       can_remove_records = False
+
+       def update(self):
+               # There is no additional data required so we directly can
+               # send our request.
+               response = self.send_request(self.url, 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
+
+               # If we got here, some other update error happened.
+               raise DDNSUpdateError
+
+
+class DDNSProviderBindNsupdate(DDNSProvider):
+       handle  = "nsupdate"
+       name    = "BIND nsupdate utility"
+       website = "http://en.wikipedia.org/wiki/Nsupdate"
+
+       DEFAULT_TTL = 60
+
+       @staticmethod
+       def supported():
+               # Search if the nsupdate utility is available
+               paths = os.environ.get("PATH")
+
+               for path in paths.split(":"):
+                       executable = os.path.join(path, "nsupdate")
+
+                       if os.path.exists(executable):
+                               return True
+
+               return False
+
+       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):
-               url = self.url % {
-                       "username" : self.username,
-                       "password" : self.password,
-               }
+       url = "http://members.dhs.org/nic/hosts"
+       can_remove_records = False
 
+       def update_protocol(self, proto):
                data = {
                        "domain"       : self.hostname,
-                       "ip"           : self.get_address("ipv4"),
+                       "ip"           : self.get_address(proto),
                        "hostcmd"      : "edit",
                        "hostcmdstage" : "2",
                        "type"         : "4",
                }
 
                # Send update to the server.
-               response = self.send_request(url, username=self.username, password=self.password,
+               response = self.send_request(self.url, username=self.username, password=self.password,
                        data=data)
 
                # Handle success messages.
                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):
-               url = self.url % {
-                       "username" : self.username,
-                       "password" : self.password,
-               }
+       url = "https://control.dnspark.com/api/dynamic/update.php"
+       can_remove_records = False
 
+       def update_protocol(self, proto):
                data = {
                        "domain" : self.hostname,
-                       "ip"     : self.get_address("ipv4"),
+                       "ip"     : self.get_address(proto),
                }
 
                # Send update to the server.
-               response = self.send_request(url, username=self.username, password=self.password,
+               response = self.send_request(self.url, username=self.username, password=self.password,
                        data=data)
 
                # Get the full response message.
@@ -257,21 +622,20 @@ 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"
 
+       url = "https://www.dtdns.com/api/autodns.cfm"
+       can_remove_records = False
 
-       def update(self):
+       def update_protocol(self, proto):
                data = {
-                       "ip" : self.get_address("ipv4"),
+                       "ip" : self.get_address(proto),
                        "id" : self.hostname,
                        "pw" : self.password
                }
@@ -312,27 +676,213 @@ class DDNSProviderDtDNS(DDNSProvider):
                raise DDNSUpdateError
 
 
-class DDNSProviderFreeDNSAfraidOrg(DDNSProvider):
-       INFO = {
-               "handle"    : "freedns.afraid.org",
-               "name"      : "freedns.afraid.org",
-               "website"   : "http://freedns.afraid.org/",
-               "protocols" : ["ipv6", "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"
+
+       # DynU sends the IPv6 and IPv4 address in one request
+
+       def update(self):
+               data = DDNSProtocolDynDNS2.prepare_request_data(self, "ipv4")
+
+               # This one supports IPv6
+               myipv6 = self.get_address("ipv6")
+
+               # Add update information if we have an IPv6 address.
+               if myipv6:
+                       data["myipv6"] = myipv6
+
+               self.send_request(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",)
+       can_remove_records = False
+
+       # 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_protocol(self, proto):
+               data = {
+                       "ip"       : self.get_address(proto),
+                       "host"     : self.hostname,
+                       "username" : self.username,
+                       "password" : self.password,
                }
 
+               # Send update to the server.
+               response = self.send_request(self.url, data=data)
+
+               # Get the full response message.
+               output = response.read()
+
+               # Handle success messages.
+               if output.startswith("200"):
+                       return
+
+               # Handle error codes.
+               if output.startswith("400"):
+                       raise DDNSRequestError(_("Malformed request has been sent."))
+               elif output.startswith("401"):
+                       raise DDNSAuthenticationError
+               elif output.startswith("402"):
+                       raise DDNSRequestError(_("Too frequent update requests have been sent."))
+               elif output.startswith("403"):
+                       raise DDNSInternalServerError
+
+               # If we got here, some other update error happened.
+               raise DDNSUpdateError(_("Server response: %s") % output) 
+
+
+class DDNSProviderEnomCom(DDNSResponseParserXML, DDNSProvider):
+       handle    = "enom.com"
+       name      = "eNom Inc."
+       website   = "http://www.enom.com/"
+       protocols = ("ipv4",)
+
+       # There are very detailed information about how to send an update request and
+       # the respone codes.
+       # http://www.enom.com/APICommandCatalog/
+
+       url = "https://dynamic.name-services.com/interface.asp"
+       can_remove_records = False
+
+       def update_protocol(self, proto):
+               data = {
+                       "command"        : "setdnshost",
+                       "responsetype"   : "xml",
+                       "address"        : self.get_address(proto),
+                       "domainpassword" : self.password,
+                       "zone"           : self.hostname
+               }
+
+               # Send update to the server.
+               response = self.send_request(self.url, data=data)
+
+               # Get the full response message.
+               output = response.read()
+
+               # Handle success messages.
+               if self.get_xml_tag_value(output, "ErrCount") == "0":
+                       return
+
+               # Handle error codes.
+               errorcode = self.get_xml_tag_value(output, "ResponseNumber")
+
+               if errorcode == "304155":
+                       raise DDNSAuthenticationError
+               elif errorcode == "304153":
+                       raise DDNSRequestError(_("Domain not found."))
+
+               # If we got here, some other update error happened.
+               raise DDNSUpdateError
+
+
+class DDNSProviderEntryDNS(DDNSProvider):
+       handle    = "entrydns.net"
+       name      = "EntryDNS"
+       website   = "http://entrydns.net/"
+       protocols = ("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"
+       can_remove_records = False
+
+       def update_protocol(self, proto):
+               data = {
+                       "ip" : self.get_address(proto),
+               }
+
+               # 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"
+       can_remove_records = False
 
-       @property
-       def proto(self):
-               return self.get("proto")
-
-       def update(self):
-               address = self.get_address(self.proto)
-
+       def update_protocol(self, proto):
                data = {
-                       "address" : address,
+                       "address" : self.get_address(proto),
                }
 
                # Add auth token to the update url.
@@ -359,43 +909,22 @@ class DDNSProviderFreeDNSAfraidOrg(DDNSProvider):
 
 
 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"
 
-       @property
-       def token(self):
-               """
-                       Fast access to the token.
-               """
-               return self.get("token")
+       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
@@ -418,82 +947,446 @@ class DDNSProviderLightningWireLabs(DDNSProvider):
                if response.code == 200:
                        return
 
+               # If we got here, some other update error happened.
+               raise DDNSUpdateError
+
+
+class DDNSProviderMyOnlinePortal(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "myonlineportal.net"
+       name      = "myonlineportal.net"
+       website   = "https:/myonlineportal.net/"
+
+       # Information about the request and response can be obtained here:
+       # https://myonlineportal.net/howto_dyndns
+
+       url = "https://myonlineportal.net/updateddns"
+
+       def prepare_request_data(self, proto):
+               data = {
+                       "hostname" : self.hostname,
+                       "ip"     : self.get_address(proto),
+               }
+
+               return data
+
+
+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
+       # https://community.namecheap.com/forums/viewtopic.php?f=6&t=6772
+
+       url = "https://dynamicdns.park-your-domain.com/update"
+       can_remove_records = False
+
+       def update_protocol(self, proto):
+               # Namecheap requires the hostname splitted into a host and domain part.
+               host, domain = self.hostname.split(".", 1)
+
+               data = {
+                       "ip"       : self.get_address(proto),
+                       "password" : self.password,
+                       "host"     : host,
+                       "domain"   : domain
+               }
+
+               # Send update to the server.
+               response = self.send_request(self.url, data=data)
+
+               # Get the full response message.
+               output = response.read()
+
+               # Handle success messages.
+               if self.get_xml_tag_value(output, "IP") == address:
+                       return
+
                # Handle error codes.
-               if response.code == 403:
+               errorcode = self.get_xml_tag_value(output, "ResponseNumber")
+
+               if errorcode == "304156":
                        raise DDNSAuthenticationError
-               elif response.code == 400:
-                       raise DDNSRequestError
+               elif errorcode == "316153":
+                       raise DDNSRequestError(_("Domain not found."))
+               elif errorcode == "316154":
+                       raise DDNSRequestError(_("Domain not active."))
+               elif errorcode in ("380098", "380099"):
+                       raise DDNSInternalServerError
 
                # If we got here, some other update error happened.
                raise DDNSUpdateError
 
 
-class DDNSProviderNOIP(DDNSProvider):
-       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
        # here: http://www.no-ip.com/integrate/response
 
-       url = "http://%(username)s:%(password)s@dynupdate.no-ip.com/nic/update"
+       url = "http://dynupdate.no-ip.com/nic/update"
+
+       def prepare_request_data(self, proto):
+               assert proto == "ipv4"
+
+               data = {
+                       "hostname" : self.hostname,
+                       "address"  : self.get_address(proto),
+               }
+
+               return data
+
+
+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
+
+       url = "https://nsupdate.info/nic/update"
+
+       # TODO nsupdate.info can actually do this, but the functionality
+       # has not been implemented here, yet.
+       can_remove_records = False
+
+       # After a failed update, there will be no retries
+       # https://bugzilla.ipfire.org/show_bug.cgi?id=10603
+       holdoff_failure_days = None
+
+       # 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.token or self.get("secret")
+
+       def prepare_request_data(self, proto):
+               data = {
+                       "myip" : self.get_address(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"
+
+       def prepare_request_data(self, proto):
+               data = {
+                       "hostname" : self.hostname,
+                       "myip"     : self.get_address(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
+       # on the their german subpage.
+       #
+       # http://hilfe.ovh.de/DomainDynHost
+
+       url = "https://www.ovh.com/nic/update"
+
+       def prepare_request_data(self, proto):
+               data = DDNSProtocolDynDNS2.prepare_request_data(self, proto)
+               data.update({
+                       "system" : "dyndns",
+               })
+
+               return data
+
+
+class DDNSProviderRegfish(DDNSProvider):
+       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.
+       # https://www.regfish.de/domains/dyndns/dokumentation
+
+       url = "https://dyndns.regfish.de/"
+       can_remove_records = False
 
        def update(self):
-               url = self.url % {
-                       "username" : self.username,
-                       "password" : self.password,
+               data = {
+                       "fqdn" : self.hostname,
                }
 
+               # Check if we update an IPv6 address.
+               address6 = self.get_address("ipv6")
+               if address6:
+                       data["ipv6"] = address6
+
+               # Check if we update an IPv4 address.
+               address4 = self.get_address("ipv4")
+               if address4:
+                       data["ipv4"] = address4
+
+               # Raise an error if none address is given.
+               if not data.has_key("ipv6") and not data.has_key("ipv4"):
+                       raise DDNSConfigurationError
+
+               # Check if a token has been set.
+               if self.token:
+                       data["token"] = self.token
+
+               # Raise an error if no token and no useranem and password
+               # are given.
+               elif not self.username and not self.password:
+                       raise DDNSConfigurationError(_("No Auth details specified."))
+
+               # HTTP Basic Auth is only allowed if no token is used.
+               if self.token:
+                       # Send update to the server.
+                       response = self.send_request(self.url, data=data)
+               else:
+                       # 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 "100" in output or "101" in output:
+                       return
+
+               # Handle error codes.
+               if "401" or "402" in output:
+                       raise DDNSAuthenticationError
+               elif "408" in output:
+                       raise DDNSRequestError(_("Invalid IPv4 address has been sent."))
+               elif "409" in output:
+                       raise DDNSRequestError(_("Invalid IPv6 address has been sent."))
+               elif "412" in output:
+                       raise DDNSRequestError(_("No valid FQDN was given."))
+               elif "414" in output:
+                       raise DDNSInternalServerError
+
+               # If we got here, some other update error happened.
+               raise DDNSUpdateError
+
+
+class DDNSProviderSelfhost(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "selfhost.de"
+       name      = "Selfhost.de"
+       website   = "http://www.selfhost.de/"
+       protocols = ("ipv4",)
+
+       url = "https://carol.selfhost.de/nic/update"
+
+       def prepare_request_data(self, proto):
+               data = DDNSProtocolDynDNS2.prepare_request_data(self, proto)
+               data.update({
+                       "hostname" : "1",
+               })
+
+               return data
+
+
+class DDNSProviderSPDNS(DDNSProtocolDynDNS2, DDNSProvider):
+       handle    = "spdns.org"
+       name      = "SPDNS"
+       website   = "http://spdns.org/"
+
+       # Detailed information about request and response codes are provided
+       # by the vendor. They are using almost the same mechanism and status
+       # codes as dyndns.org so we can inherit all those stuff.
+       #
+       # http://wiki.securepoint.de/index.php/SPDNS_FAQ
+       # http://wiki.securepoint.de/index.php/SPDNS_Update-Tokens
+
+       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 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, proto):
+               assert proto == "ipv4"
+
+               data = {
+                       "ip"       : self.get_address(proto),
+                       "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/
+
+       url = "https://dyndns.variomedia.de/nic/update"
+
+       def prepare_request_data(self, proto):
                data = {
                        "hostname" : self.hostname,
-                       "address"  : self.get_address("ipv4"),
+                       "myip"     : self.get_address(proto),
+               }
+
+               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"
+
+       def update_protocol(self, proto):
+               data = {
+                       "dnsto" : self.get_address(proto),
+                       "host"  : self.hostname
                }
 
                # Send update to the server.
-               response = self.send_request(url, data=data)
+               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("good") or output.startswith("nochg"):
+               if output.startswith("<SUCCESS"):
                        return
 
                # Handle error codes.
-               if output == "badauth":
+               if output.startswith("invalid login"):
                        raise DDNSAuthenticationError
-               elif output == "aduse":
-                       raise DDNSAbuseError
-               elif output == "911":
+               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
 
 
-class DDNSProviderSelfhost(DDNSProvider):
-       INFO = {
-               "handle"    : "selfhost.de",
-               "name"      : "Selfhost.de",
-               "website"   : "http://www.selfhost.de/",
-               "protocols" : ["ipv4",],
-       }
+class DDNSProviderZZZZ(DDNSProvider):
+       handle    = "zzzz.io"
+       name      = "zzzz"
+       website   = "https://zzzz.io"
+       protocols = ("ipv6", "ipv4",)
 
-       url = "https://carol.selfhost.de/update"
+       # Detailed information about the update request can be found here:
+       # https://zzzz.io/faq/
 
-       def update(self):
+       # Details about the possible response codes have been provided in the bugtracker:
+       # https://bugzilla.ipfire.org/show_bug.cgi?id=10584#c2
+
+       url = "https://zzzz.io/api/v1/update"
+       can_remove_records = False
+
+       def update_protocol(self, proto):
                data = {
-                       "username" : self.username,
-                       "password" : self.password,
-                       "textmodi" : "1",
+                       "ip"    : self.get_address(proto),
+                       "token" : self.token,
                }
 
-               response = self.send_request(self.url, data=data)
+               if proto == "ipv6":
+                       data["type"] = "aaaa"
+
+               # zzzz uses the host from the full hostname as part
+               # of the update url.
+               host, domain = self.hostname.split(".", 1)
+
+               # Add host value to the update url.
+               url = "%s/%s" % (self.url, host)
+
+               # Send update to the server.
+               try:
+                       response = self.send_request(url, data=data)
+
+               # Handle error codes.
+               except DDNSNotFound:
+                       raise DDNSRequestError(_("Invalid hostname specified"))
 
-               match = re.search("status=20(0|4)", response.read())
-               if not match:
-                       raise DDNSUpdateError
+               # Handle success messages.
+               if response.code == 200:
+                       return
+
+               # If we got here, some other update error happened.
+               raise DDNSUpdateError