Silently fall back to the guess the IP address with a remote server

[oddments/ddns.git] / src / ddns / system.py

diff --git a/src/ddns/system.py b/src/ddns/system.py
index cab2942aba4c101eb4da157225527e238d99c579..c268ba5cbae57dbbdd3aa1e1023ab96ca0cf41b1 100644 (file)
--- a/src/ddns/system.py
+++ b/src/ddns/system.py
@@ -21,6 +21,7 @@
 
 import base64
 import re
+import ssl
 import socket
 import urllib
 import urllib2
@@ -65,6 +66,13 @@ class DDNSSystem(object):
                return proxy
 
        def get_local_ip_address(self, proto):
+               ip_address = self._get_local_ip_address(proto)
+
+               # Check if the IP address is usable and only return it then
+               if self._is_usable_ip_address(proto, ip_address):
+                       return ip_address
+
+       def _get_local_ip_address(self, proto):
                # Legacy code for IPFire 2.
                if self.distro == "ipfire-2" and proto == "ipv4":
                        try:
@@ -166,6 +174,11 @@ class DDNSSystem(object):
                        return resp
 
                except urllib2.HTTPError, e:
+                       # Log response header.
+                       logger.debug(_("Response header (Status Code %s):") % e.code)
+                       for k, v in e.hdrs.items():
+                               logger.debug("  %s: %s" % (k, v))
+
                        # 400 - Bad request
                        if e.code == 400:
                                raise DDNSRequestError(e.reason)
@@ -175,6 +188,12 @@ class DDNSSystem(object):
                        elif e.code in (401, 403):
                                raise DDNSAuthenticationError(e.reason)
 
+                       # 404 - Not found
+                       # Either the provider has changed the API, or
+                       # there is an error on the server
+                       elif e.code == 404:
+                               raise DDNSNotFound(e.reason)
+
                        # 500 - Internal Server Error
                        elif e.code == 500:
                                raise DDNSInternalServerError(e.reason)
@@ -188,6 +207,20 @@ class DDNSSystem(object):
 
                except urllib2.URLError, e:
                        if e.reason:
+                               # Handle SSL errors
+                               if isinstance(e.reason, ssl.SSLError):
+                                       e = e.reason
+
+                                       if e.reason == "CERTIFICATE_VERIFY_FAILED":
+                                               raise DDNSCertificateError
+
+                                       # Raise all other SSL errors
+                                       raise DDNSSSLError(e.reason)
+
+                               # Name or service not known
+                               if e.reason.errno == -2:
+                                       raise DDNSResolveError
+
                                # Network Unreachable (e.g. no IPv6 access)
                                if e.reason.errno == 101:
                                        raise DDNSNetworkUnreachableError
@@ -196,6 +229,10 @@ class DDNSSystem(object):
                                elif e.reason.errno == 111:
                                        raise DDNSConnectionRefusedError
 
+                               # No route to host
+                               elif e.reason.errno == 113:
+                                       raise DDNSNoRouteToHostError(req.host)
+
                        # Raise all other unhandled exceptions.
                        raise
 
@@ -251,16 +288,18 @@ class DDNSSystem(object):
                guess_ip = self.core.settings.get("guess_external_ip", "true")
                guess_ip = guess_ip in ("true", "yes", "1")
 
-               # If the external IP address should be used, we just do that.
-               if guess_ip:
-                       return self.guess_external_ip_address(proto)
-
                # Get the local IP address.
-               local_ip_address = self.get_local_ip_address(proto)
+               local_ip_address = None
 
-               # If the local IP address is not usable, we must guess
-               # the correct IP address...
-               if not self._is_usable_ip_address(proto, local_ip_address):
+               if not guess_ip:
+                       try:
+                               local_ip_address = self.get_local_ip_address(proto)
+                       except NotImplementedError:
+                               logger.warning(_("Falling back to check the IP address with help of a public server"))
+
+               # If no local IP address could be determined, we will fall back to the guess
+               # it with help of an external server...
+               if not local_ip_address:
                        local_ip_address = self.guess_external_ip_address(proto)
 
                return local_ip_address
@@ -316,6 +355,10 @@ class DDNSSystem(object):
                        if e.errno == -2:
                                return []
 
+                       # Temporary failure in name resolution
+                       elif e.errno == -3:
+                               raise DDNSResolveError(hostname)
+
                        # No record for requested family available (e.g. no AAAA)
                        elif e.errno == -5:
                                return []