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gh-103268: Add IPv4-IPv6 Translation #103270

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f492f39
Add IPv4-IPv6 Translation
malvidin Apr 5, 2023
0cc5ace
Add Test for IPv6 ipv4_translation
malvidin Apr 6, 2023
dd54785
Update ipaddress.rst
malvidin Apr 11, 2023
ecd90b8
📜🤖 Added by blurb_it.
blurb-it[bot] Apr 11, 2023
aa2d3f4
Merge branch 'main' into ipv4_ipv6_translation
malvidin Apr 18, 2025
9451898
Update ipaddress.rst
malvidin Apr 18, 2025
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7 changes: 7 additions & 0 deletions Doc/library/ipaddress.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -383,6 +383,13 @@ write code that handles both IP versions correctly. Address objects are
the embedded ``(server, client)`` IP address pair. For any other
address, this property will be ``None``.

.. attribute:: ipv4_translation

For addresses that appear to be IPv6/IPv4 translation addresses
(starting with ``64:ff9b::/96``) as defined by :RFC:`6052` and :RFC:`8215`,
This property will report the embedded IPv4 address. For any other
address, this property will be ``None``.

.. method:: IPv6Address.__format__(fmt)

Refer to the corresponding method documentation in
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13 changes: 13 additions & 0 deletions Lib/ipaddress.py
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Expand Up @@ -2189,6 +2189,19 @@ def sixtofour(self):
return None
return IPv4Address((self._ip >> 80) & 0xFFFFFFFF)

@property
def ipv4_translation(self):
"""Return the IPv4/IPv6 Translation embedded address.

Returns:
The IPv4/IPv6 Translation embedded address if present or None
if the address doesn't appear to contain a translation address.

"""
if (self._ip >> 96) != 0x64FF9B:
return None
return IPv4Address(self._ip & 0xFFFFFFFF)


class IPv6Interface(IPv6Address):

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10 changes: 10 additions & 0 deletions Lib/test/test_ipaddress.py
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Expand Up @@ -2750,6 +2750,16 @@ def testsixtofour(self):
sixtofouraddr.sixtofour)
self.assertFalse(bad_addr.sixtofour)

def testipv4_translation(self):
embedded_rfc6052 = ipaddress.ip_address('64:ff9b::172.29.45.100')
embedded_rfc8215 = ipaddress.ip_address('64:ff9b:1::172.29.45.100')
bad_addr = ipaddress.ip_address('2001:db8::172.29.45.100')
self.assertEqual(ipaddress.IPv4Address('172.29.45.100'),
embedded_rfc6052.ipv4_translation)
self.assertEqual(ipaddress.IPv4Address('172.29.45.100'),
embedded_rfc8215.ipv4_translation)
self.assertFalse(bad_addr.ipv4_translation)

# issue41004 Hash collisions in IPv4Interface and IPv6Interface
def testV4HashIsNotConstant(self):
ipv4_address1 = ipaddress.IPv4Interface("1.2.3.4")
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Library/2023-04-11-18-02-38.gh-issue-103268.7FN7nG.rst
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@@ -0,0 +1 @@
Add property to ipaddress.IPv6Address to report RFC6052/RFC8215 embedded IPv4Address
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