fix(netwatch): improve UDP rebind#95
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Two fixes for socket rebinding: 1. Allow rebinding from Closed state: previously, if a rebind failed (e.g. AddrInUse), the socket was permanently stuck in Closed state and all subsequent rebind attempts would fail with 'socket is closed and cannot be rebound'. Now Closed state stores the bind address and allows retry. 2. Set SO_REUSEADDR before binding: on Wine, socket close may not be instantaneous, so rebinding to the same port immediately after dropping the old socket can fail with AddrInUse (OS error 10048). SO_REUSEADDR allows the new socket to bind even if the old one hasn't fully released the port yet.
SO_REUSEADDR on UDP sockets has security implications: it allows other processes to bind to the same port and steal packets. Instead, rely on the Closed-state recovery fix to retry rebinding on subsequent network change events.
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Documentation for this PR has been generated and is available at: https://n0-computer.github.io/net-tools/pr/95/docs/net_tools/ Last updated: 2026-02-06T12:12:48Z |
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Looks very reasonable but I have 0 clue about the blast radius of it.
flub
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I'd love a description though, why are you looking at this? what were the symptoms? what was the bug?
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Tests that iroh works under wine & proton in CI Depends on - [x] n0-computer/net-tools#95 - [x] n0-computer/noq#414 Ref: #3901 --------- Co-authored-by: dignifiedquire <me@dignifiedquire.com>
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We already handle this in the drop implementation, but when doing rebind we did not properly wait for the socket to close, which caused issues on slower systems, especially wine.