gh-142991: socketmodule: fixed getsockaddrlen() for PF_DIVERT socket

[glebius]

This is my miss from #96534

• Issue: socketmodule: FreeBSD PF_DIVERT is missing in getsockaddrlen() #142991

[glebius]

Tag @vstinner who handled the initial submission of PF_DIVERT.

[vstinner]

The example from the issue still fails after applying this change:

vstinner@freebsd$ catraw.pyfromsocketimportsocket, PF_DIVERT, SOCK_RAWwithsocket(PF_DIVERT, SOCK_RAW, 0) asfd:
r=fd.recvfrom(16384)
vstinner@freebsd$ ./pythonraw.pyTraceback (mostrecentcalllast):
File"/usr/home/vstinner/python/main/raw.py", line2, in<module>withsocket(PF_DIVERT, SOCK_RAW, 0) asfd:
~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^File"/usr/home/vstinner/python/main/Lib/socket.py", line237, in__init___socket.socket.__init__(self, family, type, proto, fileno)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^OSError: [Errno47] Addressfamilynotsupportedbyprotocolfamily

[glebius]

The example from the issue still fails after applying this change:
OSError: [Errno 47] Address family not supported by protocol family

What FreeBSD version do you test on? The GENERIC kernel doesn't have divert module. Do you have ipdivert.ko loaded?

[vstinner]

What FreeBSD version do you test on? The GENERIC kernel doesn't have divert module. Do you have ipdivert.ko loaded?

I tested on:

vstinner@freebsd$ uname -a
FreeBSD freebsd 14.2-RELEASE-p1 FreeBSD 14.2-RELEASE-p1 GENERIC amd64

Ah! The example works if I load the kernel module with sudo kldload ipdivert.ko and run the example as root (sudo ./python raw.py).

[vstinner]

Without this change, the example fails with:

Traceback (mostrecentcalllast):
File"/usr/home/vstinner/python/main/raw.py", line3, in<module>r=fd.recvfrom(16384)
OSError: getsockaddrlen: badfamily

[miss-islington-app]

Thanks @glebius for the PR, and @vstinner for merging it 🌮🎉.. I'm working now to backport this PR to: 3.13, 3.14.
🐍🍒⛏🤖

[bedevere-app]

GH-143481 is a backport of this pull request to the 3.14 branch.

[bedevere-app]

GH-143482 is a backport of this pull request to the 3.13 branch.

[vstinner]

Merged, thanks. I backported the fix to 3.13 and 3.14 branches.

[glebius]

Thanks, Victor!

[bedevere-bot]

⚠️⚠️⚠️ Buildbot failure ⚠️⚠️⚠️

Hi! The buildbot AMD64 FreeBSD14 3.13 (tier-3) has failed when building commit 7f93669.

What do you need to do:

1. Don't panic.
2. Check the buildbot page in the devguide if you don't know what the buildbots are or how they work.
3. Go to the page of the buildbot that failed (https://buildbot.python.org/#/builders/1481/builds/1800) and take a look at the build logs.
4. Check if the failure is related to this commit (7f93669) or if it is a false positive.
5. If the failure is related to this commit, please, reflect that on the issue and make a new Pull Request with a fix.

You can take a look at the buildbot page here:

https://buildbot.python.org/#/builders/1481/builds/1800

Summary of the results of the build (if available):

Click to see traceback logs

remote: Enumerating objects: 14, done. remote: Counting objects: 12% (1/8) remote: Counting objects: 25% (2/8) remote: Counting objects: 37% (3/8) remote: Counting objects: 50% (4/8) remote: Counting objects: 62% (5/8) remote: Counting objects: 75% (6/8) remote: Counting objects: 87% (7/8) remote: Counting objects: 100% (8/8) remote: Counting objects: 100% (8/8), done. remote: Compressing objects: 12% (1/8) remote: Compressing objects: 25% (2/8) remote: Compressing objects: 37% (3/8) remote: Compressing objects: 50% (4/8) remote: Compressing objects: 62% (5/8) remote: Compressing objects: 75% (6/8) remote: Compressing objects: 87% (7/8) remote: Compressing objects: 100% (8/8) remote: Compressing objects: 100% (8/8), done. remote: Total 14 (delta 1), reused 2 (delta 0), pack-reused 6 (from 2) 
From https://github.com/python/cpython
* branch 3.13 -> FETCH_HEAD
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Turn off this advice by setting config variable advice.detachedHead to false
HEAD is now at 7f936694dbc [3.13] gh-142991: socketmodule: fixed getsockaddrlen() for PF_DIVERT socket (GH-142993) (#143482)
Switched to and reset branch '3.13'
1 error

[vstinner]

Oops, the 3.13 backport broke the build on FreeBSD. I wrote #143514 to fix it.