Brad Fitzpatrick
5d35baeb87
After copying from the backend to the client until EOF, forwardTCP shut
down the backend socket's read side. That does nothing on the wire, and
once the backend's FIN has arrived, macOS rejects shutdown(SHUT_RD) with
ENOTCONN (Linux does too once the socket reaches TIME_WAIT), so every
forwarded connection logged "backend -> client close connection: ...
socket is not connected". Keep only the CloseWrite calls, which are what
propagate the half-close.
The regression was introduced by 04d24cdbd4 (#16462), merged 2025-07-07.
Tested on Linux and on macOS 27 (arm64): the wgengine/netstack tests
pass on both. The same ENOTCONN failure was reproduced on macOS via the
identical pattern in net/socks5 (#21522).
Updates #21522
Updates #16462
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Change-Id: I3e9b1d7f4a2c8e6b0f5d9a3c7e1b4f8d2a6c0e5b
Tailscale
Private WireGuard® networks made easy
Overview
This repository contains the majority of Tailscale's open source code.
Notably, it includes the tailscaled daemon and
the tailscale CLI tool. The tailscaled daemon runs on Linux, Windows,
macOS, and to varying degrees
on FreeBSD and OpenBSD. The Tailscale iOS and Android apps use this repo's
code, but this repo doesn't contain the mobile GUI code.
Other Tailscale repos of note:
- the Android app is at https://github.com/tailscale/tailscale-android
- the Synology package is at https://github.com/tailscale/tailscale-synology
- the QNAP package is at https://github.com/tailscale/tailscale-qpkg
- the Chocolatey packaging is at https://github.com/tailscale/tailscale-chocolatey
For background on which parts of Tailscale are open source and why, see https://tailscale.com/opensource/.
Using
We serve packages for a variety of distros and platforms at https://pkgs.tailscale.com.
Other clients
The macOS, iOS, and Windows clients use the code in this repository but additionally include small GUI wrappers. The GUI wrappers on non-open source platforms are themselves not open source.
Building
We always require the latest Go release, currently Go 1.27. (While we build releases with our Go fork, its use is not required.)
go install tailscale.com/cmd/tailscale{,d}
If you're packaging Tailscale for distribution, use build_dist.sh
instead, to burn commit IDs and version info into the binaries:
./build_dist.sh tailscale.com/cmd/tailscale
./build_dist.sh tailscale.com/cmd/tailscaled
If your distro has conventions that preclude the use of
build_dist.sh, please do the equivalent of what it does in your
distro's way, so that bug reports contain useful version information.
Bugs
Please file any issues about this code or the hosted service on the issue tracker.
Contributing
PRs welcome! But please file bugs. Commit messages should reference bugs.
We require Developer Certificate of
Origin
Signed-off-by lines in commits.
See commit-messages.md (or skim git log) for our commit message style.
About Us
Tailscale is primarily developed by the people at https://github.com/orgs/tailscale/people. For other contributors, see:
- https://github.com/tailscale/tailscale/graphs/contributors
- https://github.com/tailscale/tailscale-android/graphs/contributors
Legal
WireGuard is a registered trademark of Jason A. Donenfeld.