Brad FitzpatrickandBrad Fitzpatrick 0433cc6929 feature/syslog, cmd/tailscaled, logpolicy: add optional --syslog flag
Add a new modular syslog feature providing a tailscaled --syslog flag
that sends the daemon's logs to the system syslog daemon instead of
stderr, which is useful when running as a daemon without a service
manager that captures stderr (e.g. OpenWrt's procd).

The feature package registers two new hooks: one to register its flag
before flag parsing, and one that tailscaled calls early in main to
redirect the standard library's default logger. Because logpolicy later
points the default logger at logtail, whose local console copy writes
to stderr, logpolicy now also consults the hook and sends its console
copy to the same sink (with timestamps disabled, as syslog records its
own).

The feature is linked by default only on Linux, FreeBSD, and OpenBSD,
and can be removed with the ts_omit_syslog build tag. If connecting to
the syslog daemon fails at startup, tailscaled logs a warning and
continues logging to stderr.

Fixes #16270

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Change-Id: I8f3a92d4c1e6b70a5d29e4f61b3c874250a9de13
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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 1.26. (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.

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