Add ipwhois library + dependencies

lib/dns/ipv4.py

@@ -0,0 +1,59 @@
+# 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.
+
+"""IPv4 helper functions."""
+
+import struct
+
+import dns.exception
+from ._compat import binary_type
+
+def inet_ntoa(address):
+    """Convert an IPv4 address in network form to text form.
+
+    @param address: The IPv4 address
+    @type address: string
+    @returns: string
+    """
+    if len(address) != 4:
+        raise dns.exception.SyntaxError
+    if not isinstance(address, bytearray):
+        address = bytearray(address)
+    return (u'%u.%u.%u.%u' % (address[0], address[1],
+                              address[2], address[3])).encode()
+
+def inet_aton(text):
+    """Convert an IPv4 address in text form to network form.
+
+    @param text: The IPv4 address
+    @type text: string
+    @returns: string
+    """
+    if not isinstance(text, binary_type):
+        text = text.encode()
+    parts = text.split(b'.')
+    if len(parts) != 4:
+        raise dns.exception.SyntaxError
+    for part in parts:
+        if not part.isdigit():
+            raise dns.exception.SyntaxError
+        if len(part) > 1 and part[0] == '0':
+            # No leading zeros
+            raise dns.exception.SyntaxError
+    try:
+        bytes = [int(part) for part in parts]
+        return struct.pack('BBBB', *bytes)
+    except:
+        raise dns.exception.SyntaxError