Moving method is_local() to class PpConfigApplication

diff --git a/pp_lib/cfg_app.py b/pp_lib/cfg_app.py
index d706aabd7036629592a1653af8bca5acf042435d..59d068c79a44264e2b1b5a45d4c372f24e606e20 100644 (file)
--- a/pp_lib/cfg_app.py
+++ b/pp_lib/cfg_app.py
@@ -20,6 +20,7 @@ import socket
 import pwd
 import pipes
 import codecs
+import ipaddress
 
 from subprocess import Popen, PIPE
 
@@ -49,7 +50,7 @@ from .mailaddress import MailAddress
 
 from .app import PpApplication
 
-__version__ = '0.6.4'
+__version__ = '0.6.5'
 LOG = logging.getLogger(__name__)
 
 VALID_MAIL_METHODS = ('smtp', 'sendmail')
@@ -789,6 +790,67 @@ class PpConfigApplication(PpApplication):
 
         self.initialized = True
 
+    # -------------------------------------------------------------------------
+    def is_local(self, domain):
+
+        if self.verbose > 1:
+            LOG.debug("Checking, whether {!r} is a not public zone.".format(domain))
+
+        tld = domain.split('.')[-1]
+        if tld in ('intern', 'internal', 'local', 'localdomain', 'lokal'):
+            LOG.debug("Zone {!r} has a local TLD {!r}.".format(domain, tld))
+            return True
+
+        zone_base = domain.split('.')[0]
+        if zone_base in ('intern', 'internal', 'local', 'localdomain', 'lokal'):
+            LOG.debug("Zone {!r} has a local base {!r}.".format(domain, tld))
+            return True
+
+        if tld != 'arpa':
+            if self.verbose > 2:
+                LOG.debug("Zone {!r} has a public TLD {!r}.".format(domain, tld))
+                return False
+
+        if domain.endswith('.in-addr.arpa'):
+            tupels = []
+            for tupel in reversed(domain.replace('.in-addr.arpa', '').split('.')):
+                tupels.append(tupel)
+            if self.verbose > 2:
+                LOG.debug("Got IPv4 tupels from zone {!r}: {}".format(domain, pp(tupels)))
+            bitmask = None
+            if len(tupels) == 1:
+                bitmask = 8
+                tupels.append('0')
+                tupels.append('0')
+                tupels.append('0')
+            elif len(tupels) == 2:
+                tupels.append('0')
+                tupels.append('0')
+                bitmask = 16
+            elif len(tupels) == 3:
+                bitmask = 24
+                tupels.append('0')
+            else:
+                LOG.warn("Could not interprete reverse IPv4 zone {!r}.".format(domain))
+                return False
+            net_address = '.'.join(tupels) + '/{}'.format(bitmask)
+            if self.verbose > 2:
+                LOG.debug("Got IPv4 network address of zone {!r}: {!r}.".format(domain, net_address))
+            network = ipaddress.ip_network(net_address)
+            if network.is_global:
+                if self.verbose > 1:
+                    LOG.debug("The network {!r} of zone {!r} is allocated for public networks.".format(
+                        net_address, domain))
+                return False
+            LOG.debug("The network {!r} of zone {!r} is allocated for local networks.".format(
+                net_address, domain))
+            return True
+
+        if self.verbose > 2:
+            LOG.debug("Zone {!r} seems to be a reverse zone for a public network.".format(domain))
+        return False
+
+
 # =============================================================================
 
 if __name__ == "__main__":