Brendan Creane
0b4c0f2080
When racing multiple upstream DNS resolvers, a REFUSED (RCode 5) response from a broken or misconfigured resolver could win the race and be returned to the client before healthier resolvers had a chance to respond with a valid answer. This caused complete DNS failure in cases where, e.g., a broken upstream resolver returned REFUSED quickly while a working resolver (such as 1.1.1.1) was still responding. Previously, only SERVFAIL (RCode 2) was treated as a soft error. REFUSED responses were returned as successful bytes and could win the race immediately. This change also treats REFUSED as a soft error in the UDP and TCP forwarding paths, so the race continues until a better answer arrives. If all resolvers refuse, the first REFUSED response is returned to the client. Additionally, SERVFAIL responses from upstream resolvers are now returned verbatim to the client rather than replaced with a locally synthesized packet. Synthesized SERVFAIL responses were authoritative and guaranteed to include a question section echoing the original query; upstream responses carry no such guarantees but may include extended error information (e.g. RFC 8914 extended DNS errors) that would otherwise be lost. Fixes #19024 Signed-off-by: Brendan Creane <bcreane@gmail.com>
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 1.25. (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.