New submission from Gabe Appleton <g...@gabeappleton.me>:
At the moment you can definitely use UDPLITE sockets on Linux systems, but it
would be good if this support were formalized such that you can detect support
at runtime easily.
At the moment, to make and use a UDPLITE socket requires something like the
following code:
>>> import socket
>>> a = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 136)
>>> b = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, 136)
>>> a.bind(('localhost', 44444))
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.setsockopt(136, 10, 16)
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.setsockopt(136, 10, 32)
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.setsockopt(136, 10, 64)
>>> b.sendto(b'test'*256, ('localhost', 44444))
If you look at this through Wireshark, you can see that the packets are
different in that the checksums and checksum coverages change.
With the pull request that I am submitting momentarily, you could do the
following code instead:
>>> import socket
>>> a = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDPLITE)
>>> b = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDPLITE)
>>> a.bind(('localhost', 44444))
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.set_send_checksum_coverage(16)
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.set_send_checksum_coverage(32)
>>> b.sendto(b'test'*256, ('localhost', 44444))
>>> b.set_send_checksum_coverage(64)
>>> b.sendto(b'test'*256, ('localhost', 44444))
One can also detect support for UDPLITE just by checking
>>> hasattr(socket, 'IPPROTO_UDPLITE')
----------
components: Library (Lib)
messages: 346103
nosy: gappleto97
priority: normal
severity: normal
status: open
title: Add formal support for UDPLITE protococl
type: enhancement
versions: Python 3.8, Python 3.9
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue37345>
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