dotnet/runtime

MulticastInterface set to loopback index does not work on OSX

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#24,340 opened on Dec 4, 2017

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 (16 comments) (0 reactions) (0 assignees)C# (5,445 forks)batch import
area-System.Net.Socketsbughelp wantedos-mac-os-x

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Description

setsockopt with IP_MULTICAST_IF value should be a struct in_addr

See https://github.com/dotnet/corefx/blob/9a563e12649a5f407d57605dc07a82637a22ef48/src/Native/Unix/System.Native/pal_networking.c#L2172

This is call from https://github.com/dotnet/corefx/blob/8f8b04afb41156aba5530992e3ed062d8bfad611/src/System.Net.Sockets/src/System/Net/Sockets/SocketPal.Unix.cs#L1135

So far seems to me we are just passing an interface index as an integer when linux setsockopt expects and in_addr struct

[EDIT] Link the source code (don't reference master) by @karelz

Contributor guide

Research direction
Examine the setsockopt call in pal networking.c and ensure that the IP MULTICAST IF value is passed as struct in addr on OSX.
Tech stack
csharp
Domain
backend
Issue type
Bug
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.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
C#Unix sockets
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
45