Missing support for Source Specific Multicast

[ciresnave]

BPO	45252
Nosy	@ciresnave

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = None
created_at = <Date 2021-09-21.00:26:04.617>
labels = ['type-feature', 'library', '3.11']
title = 'Missing support for Source Specific Multicast'
updated_at = <Date 2021-09-24.23:41:45.383>
user = 'https://github.com/ciresnave'

bugs.python.org fields:

activity = <Date 2021-09-24.23:41:45.383>
actor = 'terry.reedy'
assignee = 'none'
closed = False
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2021-09-21.00:26:04.617>
creator = 'ciresnave'
dependencies = []
files = []
hgrepos = []
issue_num = 45252
keywords = []
message_count = 1.0
messages = ['402283']
nosy_count = 1.0
nosy_names = ['ciresnave']
pr_nums = []
priority = 'normal'
resolution = None
stage = None
status = 'open'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue45252'
versions = ['Python 3.11']

Linked PRs

• gh-89415: Add source-specific multicast constants to socket module #103684
• gh-89415: Mention new IP_* constants in socket module in the docs #105266
• [3.12] gh-89415: Mention new IP_* constants in socket module in the docs (GH-105266) #105270

[ciresnave]

It appears that Python's socket module is missing support for the IGMPv3 socket options needed to support Source Specific Multicast. Many developers appear to be adding the necessary constants through something like:

if not hasattr(socket, "IP_UNBLOCK_SOURCE"):
    setattr(socket, "IP_UNBLOCK_SOURCE", 37)
if not hasattr(socket, "IP_BLOCK_SOURCE"):
    setattr(socket, "IP_BLOCK_SOURCE", 38)
if not hasattr(socket, "IP_ADD_SOURCE_MEMBERSHIP"):
    setattr(socket, "IP_ADD_SOURCE_MEMBERSHIP", 39)
if not hasattr(socket, "IP_DROP_SOURCE_MEMBERSHIP"):
    setattr(socket, "IP_DROP_SOURCE_MEMBERSHIP", 40)

...but it would be nice if these were added to the official module as they are supported under current versions of Windows, Linux, and BSD at the least.