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bpo-37228: Fix loop.create_datagram_endpoint()'s usage of SO_REUSEADDR (#17311)

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Kyle Stanley 2019-12-09 09:21:10 -05:00 • committed by Łukasz Langa
parent 82b4950b5e
commit ab513a38c9
4 changed files with 67 additions and 29 deletions
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24
Doc/library/asyncio-eventloop.rst
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@ -473,6 +473,21 @@ Opening network connections
reuse_address=None, reuse_port=None, \
allow_broadcast=None, sock=None)
.. note::
The parameter *reuse_address* is no longer supported, as using
:py:data:`~sockets.SO_REUSEADDR` poses a significant security concern for
UDP. Explicitly passing ``reuse_address=True`` will raise an exception.
When multiple processes with differing UIDs assign sockets to an
indentical UDP socket address with ``SO_REUSEADDR``, incoming packets can
become randomly distributed among the sockets.
For supported platforms, *reuse_port* can be used as a replacement for
similar functionality. With *reuse_port*,
:py:data:`~sockets.SO_REUSEPORT` is used instead, which specifically
prevents processes with differing UIDs from assigning sockets to the same
socket address.
Create a datagram connection.
The socket family can be either :py:data:`~socket.AF_INET`,
@ -501,11 +516,6 @@ Opening network connections
resolution. If given, these should all be integers from the
corresponding :mod:`socket` module constants.
* *reuse_address* tells the kernel to reuse a local socket in
``TIME_WAIT`` state, without waiting for its natural timeout to
expire. If not specified will automatically be set to ``True`` on
Unix.
* *reuse_port* tells the kernel to allow this endpoint to be bound to the
same port as other existing endpoints are bound to, so long as they all
set this flag when being created. This option is not supported on Windows
@ -527,6 +537,10 @@ Opening network connections
The *family*, *proto*, *flags*, *reuse_address*, *reuse_port,
*allow_broadcast*, and *sock* parameters were added.
.. versionchanged:: 3.8.1
The *reuse_address* parameter is no longer supported due to security
concerns.
.. versionchanged:: 3.8
Added support for Windows.