src/ddns/__init__.py

   1 #!/usr/bin/python
   2 ###############################################################################
   3 #                                                                             #
   4 # ddns - A dynamic DNS client for IPFire                                      #
   5 # Copyright (C) 2012 IPFire development team                                  #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21
  22 import logging
  23 import logging.handlers
  24 import ConfigParser
  25
  26 from i18n import _
  27
  28 logger = logging.getLogger("ddns.core")
  29 logger.propagate = 1
  30
  31 from .providers import *
  32 from .system import DDNSSystem
  33
  34 # Setup the logger.
  35 def setup_logging():
  36         rootlogger = logging.getLogger("ddns")
  37         rootlogger.setLevel(logging.INFO)
  38
  39         # Setup a logger that logs to syslog.
  40         handler = logging.handlers.SysLogHandler(address="/dev/log",
  41                 facility=logging.handlers.SysLogHandler.LOG_DAEMON
  42         )
  43         handler.setLevel(logging.INFO)
  44         rootlogger.addHandler(handler)
  45
  46         handler = logging.StreamHandler()
  47         rootlogger.addHandler(handler)
  48
  49 setup_logging()
  50
  51 class DDNSCore(object):
  52         def __init__(self, debug=False):
  53                 # In debug mode, enable debug logging.
  54                 if debug:
  55                         logger.setLevel(logging.DEBUG)
  56                         logger.debug(_("Debugging mode enabled"))
  57
  58                 # Initialize the settings array.
  59                 self.settings = {}
  60
  61                 # Dict with all providers, that are supported.
  62                 self.providers = {}
  63                 self.register_all_providers()
  64
  65                 # List of configuration entries.
  66                 self.entries = []
  67
  68                 # Add the system class.
  69                 self.system = DDNSSystem(self)
  70
  71         def register_provider(self, provider):
  72                 """
  73                         Registers a new provider.
  74                 """
  75                 assert issubclass(provider, DDNSProvider)
  76
  77                 provider_handle = provider.INFO.get("handle")
  78                 assert provider_handle
  79
  80                 assert not self.providers.has_key(provider_handle), \
  81                         "Provider '%s' has already been registered" % provider_handle
  82
  83                 provider_name = provider.INFO.get("name")
  84                 assert provider_name
  85
  86                 logger.debug("Registered new provider: %s (%s)" % (provider_name, provider_handle))
  87                 self.providers[provider_handle] = provider
  88
  89         def register_all_providers(self):
  90                 """
  91                         Simply registers all providers.
  92                 """
  93                 for provider in (
  94                         DDNSProviderDHS,
  95                         DDNSProviderDNSpark,
  96                         DDNSProviderNOIP,
  97                         DDNSProviderLightningWireLabs,
  98                         DDNSProviderSelfhost,
  99                 ):
 100                         self.register_provider(provider)
 101
 102         def get_provider_names(self):
 103                 """
 104                         Returns a list of names of all registered providers.
 105                 """
 106                 return sorted(self.providers.keys())
 107
 108         def load_configuration(self, filename):
 109                 configs = ConfigParser.SafeConfigParser()
 110                 configs.read([filename,])
 111
 112                 # First apply all global configuration settings.
 113                 for k, v in configs.items("config"):
 114                         self.settings[k] = v
 115
 116                 for entry in configs.sections():
 117                         # Skip the special config section.
 118                         if entry == "config":
 119                                 continue
 120
 121                         settings = {}
 122                         for k, v in configs.items(entry):
 123                                 settings[k] = v
 124                         settings["hostname"] = entry
 125
 126                         # Get the name of the provider.
 127                         provider = settings.get("provider", None)
 128                         if not provider:
 129                                 logger.warning("Entry '%s' lacks a provider setting. Skipping." % entry)
 130                                 continue
 131
 132                         # Try to find the provider with the wanted name.
 133                         try:
 134                                 provider = self.providers[provider]
 135                         except KeyError:
 136                                 logger.warning("Could not find provider '%s' for entry '%s'." % (provider, entry))
 137                                 continue
 138
 139                         # Create an instance of the provider object with settings from the
 140                         # configuration file.
 141                         entry = provider(self, **settings)
 142
 143                         # Add new entry to list (if not already exists).
 144                         if not entry in self.entries:
 145                                 self.entries.append(entry)
 146
 147         def updateone(self, hostname, **kwargs):
 148                 for entry in self.entries:
 149                         if not entry.hostname == hostname:
 150                                 continue
 151
 152                         return self._update(entry, **kwargs)
 153
 154                 raise DDNSHostNotFoundError(hostname)
 155
 156         def updateall(self, **kwargs):
 157                 """
 158                         Update all configured entries.
 159                 """
 160                 # If there are no entries, there is nothing to do.
 161                 if not self.entries:
 162                         logger.debug(_("Found no entries in the configuration file. Exiting."))
 163                         return
 164
 165                 for entry in self.entries:
 166                         self._update(entry, **kwargs)
 167
 168         def _update(self, entry, force=False):
 169                 try:
 170                         entry(force=force)
 171
 172                 except DDNSUpdateError, e:
 173                         logger.error(_("Dynamic DNS update for %(hostname)s (%(provider)s) failed:") % \
 174                                 { "hostname" : entry.hostname, "provider" : entry.name })
 175                         logger.error("  %s" % e)
 176
 177                 except Exception, e:
 178                         logger.error(_("Dynamic DNS update for %(hostname)s (%(provider)s) throwed an unhandled exception:") % \
 179                                 { "hostname" : entry.hostname, "provider" : entry.name })
 180                         logger.error("  %s" % e)
 181
 182                 else:
 183                         logger.info(_("Dynamic DNS update for %(hostname)s (%(provider)s) successful") % \
 184                                 { "hostname" : entry.hostname, "provider" : entry.name })