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

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.

That is what I figured it needs to match the constant flags on the OS. For darwin it says 70. So mac needs something different ?

https://github.com/apple/darwin-xnu/blob/8f02f2a044b9bb1ad951987ef5bab20ec9486310/bsd/netinet/in.h

I found a header for win 10 SDK. It says 15.

https://github.com/tpn/winsdk-10/blob/master/Include/10.0.16299.0/shared/ws2ipdef.h

I'm sorry to ask if getting the right flags setup. Is socket.IPPROTO_IP the correct way to setup SSM because the old examples out there using socket.SOL_IP cause endless "invalid argument" errors. The struct packing is similar to the windows docs. Needs to join the group, source ip, then local ip

Here is a patch for windows and macOS I've come up with. Will eventually test on macOS but Windows first.

platform = platform.system()
if (platform == "Windows"):
    if not hasattr(socket, "IP_UNBLOCK_SOURCE"):
        setattr(socket, "IP_UNBLOCK_SOURCE", 18)
    if not hasattr(socket, "IP_BLOCK_SOURCE"):
        setattr(socket, "IP_BLOCK_SOURCE", 17)
    if not hasattr(socket, "IP_ADD_SOURCE_MEMBERSHIP"):
        setattr(socket, "IP_ADD_SOURCE_MEMBERSHIP", 15)
    if not hasattr(socket, "IP_DROP_SOURCE_MEMBERSHIP"):
        setattr(socket, "IP_DROP_SOURCE_MEMBERSHIP", 16)
elif (platform == 'Darwin'):
    if not hasattr(socket, "IP_UNBLOCK_SOURCE"):
        setattr(socket, "IP_UNBLOCK_SOURCE", 73)
    if not hasattr(socket, "IP_BLOCK_SOURCE"):
        setattr(socket, "IP_BLOCK_SOURCE", 72)
    if not hasattr(socket, "IP_ADD_SOURCE_MEMBERSHIP"):
        setattr(socket, "IP_ADD_SOURCE_MEMBERSHIP", 70)
    if not hasattr(socket, "IP_DROP_SOURCE_MEMBERSHIP"):
        setattr(socket, "IP_DROP_SOURCE_MEMBERSHIP", 71)
else:
    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)

pythongh-89415: Add socket options for source-specific multicast

gh-89415: Add source-specific multicast constants to socket module (#…

pythongh-89415: update docs

pythongh-89415: news file update

pythongh-89415: Mention new `IP_*` constants in `socket` module in th…

gh-89415: Mention new `IP_*` constants in `socket` module in the docs (…

pythongh-89415: Mention new `IP_*` constants in `socket` module in th…

[3.12] gh-89415: Mention new `IP_*` constants in `socket` module in t…

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Missing support for Source Specific Multicast #89415

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ciresnave commented on Sep 21, 2021

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danrossi commented on Jul 30, 2022

danrossi commented on Jul 30, 2022

danrossi commented on Jul 30, 2022

danrossi commented on Jul 30, 2022

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