7e609b2581
Every netmap change, including an incremental delta of a single peer, rebuilt the full MagicDNS state twice: dnsConfigForNetmap walked all peers to build the dns.Config.Hosts map, and resolver.SetConfig then walked that map again to build its reverse (PTR) index. On a tailnet with 10k peers that is a lot of garbage per delta. Instead, add a resolver.MagicDNSHosts hook, installed once by LocalBackend, that the quad-100 resolver consults on demand at query time. It is backed by nodeBackend's nodeByName, nodeByAddr, and peers indexes, which are already maintained incrementally as netmap deltas arrive. The subdomain-resolve capability check also moves to the hook (checking the node's CapMap at query time), so dns.Config's SubdomainHosts is no longer populated. dns.Config.Hosts remains for control's DNS.ExtraRecords, which are few and which feed the split-DNS decisions in dns.Manager's compileConfig, and on Windows it still carries every node's records because the hosts-file fallback path (compileHostEntries) needs the complete enumerable set. Those compileConfig decisions also consulted the per-node Hosts entries (hasHostsWithoutSplitDNSRoutes), so a new Config.MagicDNSHostsUnrouted bit preserves that signal now that node records are not listed: with MagicDNS names present but MagicDNS domain routing off, quad-100 stays in the OS resolver path. One small behavior change: reverse (PTR) lookups now also answer for node addresses whose forward records are filtered out by the IPv6-suppression rule (issue #1152), since nodeByAddr indexes all node addresses. Previously such addresses were absent from the pushed Hosts map and thus from the reverse index. Updates #12542 Updates tailscale/corp#43949 Change-Id: I63b99199c2b3b124c08cb8bbaea1f63165095294 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.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 1.26. (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:
- 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.