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name : ipv6.py
# 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.

"""IPv6 helper functions."""

import re

import dns.exception
import dns.ipv4

_leading_zero = re.compile(r'0+([0-9a-f]+)')

def inet_ntoa(address):
    """Convert a network format IPv6 address into text.

    @param address: the binary address
    @type address: string
    @rtype: string
    @raises ValueError: the address isn't 16 bytes long
    """

    if len(address) != 16:
        raise ValueError("IPv6 addresses are 16 bytes long")
    hex = address.encode('hex_codec')
    chunks = []
    i = 0
    l = len(hex)
    while i < l:
        chunk = hex[i : i + 4]
        # strip leading zeros.  we do this with an re instead of
        # with lstrip() because lstrip() didn't support chars until
        # python 2.2.2
        m = _leading_zero.match(chunk)
        if not m is None:
            chunk = m.group(1)
        chunks.append(chunk)
        i += 4
    #
    # Compress the longest subsequence of 0-value chunks to ::
    #
    best_start = 0
    best_len = 0
    start = -1
    last_was_zero = False
    for i in xrange(8):
        if chunks[i] != '0':
            if last_was_zero:
                end = i
                current_len = end - start
                if current_len > best_len:
                    best_start = start
                    best_len = current_len
                last_was_zero = False
        elif not last_was_zero:
            start = i
            last_was_zero = True
    if last_was_zero:
        end = 8
        current_len = end - start
        if current_len > best_len:
            best_start = start
            best_len = current_len
    if best_len > 1:
        if best_start == 0 and \
           (best_len == 6 or
            best_len == 5 and chunks[5] == 'ffff'):
            # We have an embedded IPv4 address
            if best_len == 6:
                prefix = '::'
            else:
                prefix = '::ffff:'
            hex = prefix + dns.ipv4.inet_ntoa(address[12:])
        else:
            hex = ':'.join(chunks[:best_start]) + '::' + \
                  ':'.join(chunks[best_start + best_len:])
    else:
        hex = ':'.join(chunks)
    return hex

_v4_ending = re.compile(r'(.*):(\d+\.\d+\.\d+\.\d+)$')
_colon_colon_start = re.compile(r'::.*')
_colon_colon_end = re.compile(r'.*::$')

def inet_aton(text):
    """Convert a text format IPv6 address into network format.

    @param text: the textual address
    @type text: string
    @rtype: string
    @raises dns.exception.SyntaxError: the text was not properly formatted
    """

    #
    # Our aim here is not something fast; we just want something that works.
    #

    if text == '::':
        text = '0::'
    #
    # Get rid of the icky dot-quad syntax if we have it.
    #
    m = _v4_ending.match(text)
    if not m is None:
        b = dns.ipv4.inet_aton(m.group(2))
        text = "%s:%02x%02x:%02x%02x" % (m.group(1), ord(b[0]), ord(b[1]),
                                         ord(b[2]), ord(b[3]))
    #
    # Try to turn '::<whatever>' into ':<whatever>'; if no match try to
    # turn '<whatever>::' into '<whatever>:'
    #
    m = _colon_colon_start.match(text)
    if not m is None:
        text = text[1:]
    else:
        m = _colon_colon_end.match(text)
        if not m is None:
            text = text[:-1]
    #
    # Now canonicalize into 8 chunks of 4 hex digits each
    #
    chunks = text.split(':')
    l = len(chunks)
    if l > 8:
        raise dns.exception.SyntaxError
    seen_empty = False
    canonical = []
    for c in chunks:
        if c == '':
            if seen_empty:
                raise dns.exception.SyntaxError
            seen_empty = True
            for i in xrange(0, 8 - l + 1):
                canonical.append('0000')
        else:
            lc = len(c)
            if lc > 4:
                raise dns.exception.SyntaxError
            if lc != 4:
                c = ('0' * (4 - lc)) + c
            canonical.append(c)
    if l < 8 and not seen_empty:
        raise dns.exception.SyntaxError
    text = ''.join(canonical)

    #
    # Finally we can go to binary.
    #
    try:
        return text.decode('hex_codec')
    except TypeError:
        raise dns.exception.SyntaxError

_mapped_prefix = '\x00' * 10 + '\xff\xff'

def is_mapped(address):
    return address.startswith(_mapped_prefix)
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