influxdata/telegraf

[inputs.socket_listener] Add support for Source-Specific-Multicast

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#18581 opened on Mar 23, 2026

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feature requesthelp wantedsize/m

Description

Use Case

I want to use the socket_listener to join and receive messages from Source-Specific-Multicast (SSM) groups using IGMPv3.

Expected behavior

When the socket_listener is configured with a specific "multicast_source" and a multicast "service_address", I expect telegraf to join the multicast group using IGMPv3 "IP_ADD_SOURCE_MULTICAST".

Actual behavior

Currently telegraf's socket_listener can only join Any-Source-Multicast (ASM) groups using "IP_ADD_MEMBERSHIP". No SSM messages can be received as SSM requires listeners to join using the correct join request.

Additional info

No response

Contributor guide

Tech stack
go
Domain
backend
Issue type
feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-2 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
Go programmingnetworking basicsmulticast concepts
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40
Research direction
Investigate the socket listener plugin in Telegraf, specifically the code that handles multicast joins (likely using syscall.Setsockopt). Research Go's net package for IP ADD SOURCE MEMBERSHIP (syscall.IP ADD SOURCE MEMBERSHIP) and how to implement IGMPv3. Review existing multicast implementation to understand the structure. Test on Linux with a known SSM source. Look for any related issues or PRs in the repository.