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authorJelmer Vernooij <jelmer@samba.org>2010-03-29 16:08:11 +0200
committerJelmer Vernooij <jelmer@samba.org>2010-03-29 18:05:29 +0200
commit4bbc3ff037026c72f3249f59c1b5af69a6ad6d69 (patch)
tree125857a1edbf3246579e51b10f6e62ec875062bc /lib/dnspython/dns/inet.py
parent89aa3b766b926d19dac4805a7e72433e497ce872 (diff)
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s4-python: Move dnspython to lib/, like the other Python modules
This also avoids it from being installed if it's already present on the system.
Diffstat (limited to 'lib/dnspython/dns/inet.py')
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1 files changed, 108 insertions, 0 deletions
diff --git a/lib/dnspython/dns/inet.py b/lib/dnspython/dns/inet.py
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+# Copyright (C) 2003-2007, 2009, 2010 Nominum, Inc.
+#
+# Permission to use, copy, modify, and distribute this software and its
+# documentation for any purpose with or without fee is hereby granted,
+# provided that the above copyright notice and this permission notice
+# appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+"""Generic Internet address helper functions."""
+
+import socket
+
+import dns.ipv4
+import dns.ipv6
+
+
+# We assume that AF_INET is always defined.
+
+AF_INET = socket.AF_INET
+
+# AF_INET6 might not be defined in the socket module, but we need it.
+# We'll try to use the socket module's value, and if it doesn't work,
+# we'll use our own value.
+
+try:
+ AF_INET6 = socket.AF_INET6
+except AttributeError:
+ AF_INET6 = 9999
+
+def inet_pton(family, text):
+ """Convert the textual form of a network address into its binary form.
+
+ @param family: the address family
+ @type family: int
+ @param text: the textual address
+ @type text: string
+ @raises NotImplementedError: the address family specified is not
+ implemented.
+ @rtype: string
+ """
+
+ if family == AF_INET:
+ return dns.ipv4.inet_aton(text)
+ elif family == AF_INET6:
+ return dns.ipv6.inet_aton(text)
+ else:
+ raise NotImplementedError
+
+def inet_ntop(family, address):
+ """Convert the binary form of a network address into its textual form.
+
+ @param family: the address family
+ @type family: int
+ @param address: the binary address
+ @type address: string
+ @raises NotImplementedError: the address family specified is not
+ implemented.
+ @rtype: string
+ """
+ if family == AF_INET:
+ return dns.ipv4.inet_ntoa(address)
+ elif family == AF_INET6:
+ return dns.ipv6.inet_ntoa(address)
+ else:
+ raise NotImplementedError
+
+def af_for_address(text):
+ """Determine the address family of a textual-form network address.
+
+ @param text: the textual address
+ @type text: string
+ @raises ValueError: the address family cannot be determined from the input.
+ @rtype: int
+ """
+ try:
+ junk = dns.ipv4.inet_aton(text)
+ return AF_INET
+ except:
+ try:
+ junk = dns.ipv6.inet_aton(text)
+ return AF_INET6
+ except:
+ raise ValueError
+
+def is_multicast(text):
+ """Is the textual-form network address a multicast address?
+
+ @param text: the textual address
+ @raises ValueError: the address family cannot be determined from the input.
+ @rtype: bool
+ """
+ try:
+ first = ord(dns.ipv4.inet_aton(text)[0])
+ return (first >= 224 and first <= 239)
+ except:
+ try:
+ first = ord(dns.ipv6.inet_aton(text)[0])
+ return (first == 255)
+ except:
+ raise ValueError
+