Alex Chan 5c24f0ed80 wgengine/magicsock: send a valid payload in TestNetworkDownSendErrors
This test ostensibly checks whether we record an error metric if a packet
is dropped because the network is down, but the network connectivity is
irrelevant -- the send error is actually because the arguments to Send()
are invalid:

    RebindingUDPConn.WriteWireGuardBatchTo:
    [unexpected] offset (0) != Geneve header length (8)

This patch changes the test so we try to send a valid packet, and we
verify this by sending it once before taking the network down.  The new
error is:

    magicsock: network down

which is what we're trying to test.

We then test sending an invalid payload as a separate test case.

Updates tailscale/corp#22075

Signed-off-by: Alex Chan <alexc@tailscale.com>
2025-09-15 23:26:32 +01:00
2025-09-15 12:44:07 -07:00
2025-09-08 11:13:39 -07:00
2025-09-11 14:24:57 -07:00
2025-04-02 07:36:04 -07:00
2024-04-16 15:32:38 -07:00
2025-08-29 10:33:14 -07:00
2025-09-08 11:47:30 -07:00
2024-03-08 15:24:36 -08:00

Tailscale

https://tailscale.com

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:

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 1.23. (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:

WireGuard is a registered trademark of Jason A. Donenfeld.

Description
The easiest, most secure way to use WireGuard and 2FA.
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