1 files changed, 108 insertions, 0 deletions
diff --git a/third_party/dnspython/dns/inet.py b/third_party/dnspython/dns/inet.py
new file mode 100644
index 0000000000..3b7e88f7b1
--- /dev/null
+++ b/third_party/dnspython/dns/inet.py
@@ -0,0 +1,108 @@
+# Copyright (C) 2003-2007, 2009-2011 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
+