netmon: Add fallback polling netmon for unsupported targets (like the existing Go one)

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
57/100
Issue type
Feature
Clarity
Mostly clear
Activity status
Active
Tech stack
rust
Domain
networking

Research direction

Read crates/net/underlay/ts_netmon/src/netmon.rs around the unsupported-target pathway, then compare it with net/netmon/netmon.go. The issue suggests polling getifaddrs as the fallback; inspect how the existing netmon reports interface changes and what Unix targets need support. Done means unsupported Unix targets receive useful network monitoring instead of a no-op, with coverage for the fallback behavior.

Written by the indexing model from the issue text.

Description

I'm trying to compile tailscale-rs for a unix target and noticed that it currently lacks any fallback netmon tool. The current unsupported target pathway no-ops:

https://github.com/tailscale/tailscale-rs/blob/a2a56c41b1db72d50d59d71d35c6669ff9639d14/crates/net/underlay/ts_netmon/src/netmon.rs#L18-L38

The Go one is quite serviceable so i think one that polls getifaddrs would suffice as a parallel.

I have one written up for my tests, would be glad to clean it up and submit a PR if this is a good addition.

Dominant language
Rust
Stars
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Forks
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Avg merge
1d 13h
Merged PRs (30d)
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