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Brad Fitzpatrick 90ba26cea1 net/netcheck: fix crash when IPv6 kinda but not really works
Looks like on some systems there's an IPv6 address, but then opening
a IPv6 UDP socket fails later. Probably some firewall. Tolerate it
better and don't crash.

To repro: check the "udp6" to something like "udp7" (something that'll
fail) and run "go run ./cmd/tailscale netcheck" on a machine with
active IPv6. It used to crash and now it doesn't.

Fixes #7949

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
2 years ago
.bencher bencher: add config to suppress failures on benchmark regressions. 3 years ago
.github .github: Bump ruby/action-slack from 3.0.0 to 3.2.1 2 years ago
atomicfile various: add golangci-lint, fix issues (#7905) 2 years ago
chirp all: update copyright and license headers 2 years ago
client/tailscale various: add golangci-lint, fix issues (#7905) 2 years ago
cmd all: avoid repeated default interface lookups 2 years ago
control all: avoid repeated default interface lookups 2 years ago
derp all: avoid repeated default interface lookups 2 years ago
disco all: update to Go 1.20, use strings.CutPrefix/Suffix instead of our fork 2 years ago
docs all: update copyright and license headers 2 years ago
doctor doctor/permissions: add new check to print process permissions 2 years ago
envknob envknob,net/tstun,wgengine: use TS_DEBUG_MTU consistently 2 years ago
health health, net/tlsdial: add healthcheck for self-signed cert 2 years ago
hostinfo ci: add more lints (#7909) 2 years ago
internal/tooldeps various: add golangci-lint, fix issues (#7905) 2 years ago
ipn all: avoid repeated default interface lookups 2 years ago
jsondb all: update copyright and license headers 2 years ago
kube ipn/store: add support for stores to hook into a custom dialer 2 years ago
licenses licenses: update win/apple licenses 2 years ago
log all: avoid repeated default interface lookups 2 years ago
logpolicy all: avoid repeated default interface lookups 2 years ago
logtail all: move network monitoring from wgengine/monitor to net/netmon 2 years ago
metrics metrics: add SetInt64 to ease using LabelMap for gauge metrics 2 years ago
net net/netcheck: fix crash when IPv6 kinda but not really works 2 years ago
packages/deb all: update copyright and license headers 2 years ago
paths all: update copyright and license headers 2 years ago
portlist various: add golangci-lint, fix issues (#7905) 2 years ago
prober all: avoid repeated default interface lookups 2 years ago
release release/dist/cli: add --verbose to print subcommand output 2 years ago
safesocket safesocket: enable test to run on Windows unpriviliged 2 years ago
scripts scripts/installer: add Deepin, RisiOS. 2 years ago
smallzstd all: update copyright and license headers 2 years ago
ssh/tailssh ssh/tailssh: handle dialing multiple recorders and failing open 2 years ago
syncs syncs: relax TestWatchMultipleValues timing on Windows 2 years ago
tailcfg ssh/tailssh: handle dialing multiple recorders and failing open 2 years ago
tempfork net/tstun/table: add initial RoutingTable implementation 2 years ago
tka various: add golangci-lint, fix issues (#7905) 2 years ago
tool various: add golangci-lint, fix issues (#7905) 2 years ago
tsconst all: update copyright and license headers 2 years ago
tsnet all: avoid repeated default interface lookups 2 years ago
tstest all: move network monitoring from wgengine/monitor to net/netmon 2 years ago
tstime tstime/rate: add Value (#7491) 2 years ago
tsweb tsweb: move varz handler(s) into separate modules 2 years ago
types wgengine/magicsock, types/nettype, etc: finish ReadFromUDPAddrPort netip migration 2 years ago
util various: add golangci-lint, fix issues (#7905) 2 years ago
version version/mkversion: don't break on tagged go.mod entries 2 years ago
wf all: update copyright and license headers 2 years ago
wgengine all: avoid repeated default interface lookups 2 years ago
words words: what?! a llama?! he's supposed to be dead! (#7623) 2 years ago
.gitattributes .: add .gitattributes entry to use Go hunk-header driver 3 years ago
.gitignore release: open-source release build logic for unix packages 2 years ago
.golangci.yml ci: add more lints (#7909) 2 years ago
ALPINE.txt Docker: add ALPINE.txt to manage alpine versions 2 years ago
AUTHORS
CODE_OF_CONDUCT.md
Dockerfile Dockerfile: fix docker build 2 years ago
Dockerfile.base all: update copyright and license headers 2 years ago
LICENSE all: update tools that manage copyright headers 2 years ago
Makefile Makefile: add help text to Makefile 2 years ago
PATENTS
README.md all: update to Go 1.20, use strings.CutPrefix/Suffix instead of our fork 2 years ago
SECURITY.md
VERSION.txt VERSION.txt: this is 1.39 2 years ago
api.md api.md: update example auth key value 2 years ago
build_dist.sh build_dist.sh: make cross-compilation friendly 2 years ago
build_docker.sh Dockerfile: fix docker build 2 years ago
flake.lock nix: update nixpkgs flake, override go_1_20 for tailscale_go (#7139) 2 years ago
flake.nix go.mod.sri: update SRI hash for go.mod changes 2 years ago
go.mod various: add golangci-lint, fix issues (#7905) 2 years ago
go.mod.sri go.mod.sri: update SRI hash for go.mod changes 2 years ago
go.sum various: add golangci-lint, fix issues (#7905) 2 years ago
go.toolchain.branch go.toolchain.branch: update to Go 1.20 2 years ago
go.toolchain.rev go.toolchain.rev: update for go 1.20.3 2 years ago
pull-toolchain.sh pull-toolchain.sh: don't run update-flake.sh 2 years ago
shell.nix go.mod.sri: update SRI hash for go.mod changes 2 years ago
staticcheck.conf staticcheck.conf: remove unnecessary warning 3 years ago
update-flake.sh .github/workflows: add workflow to update go.mod Nix SRI hash 2 years ago
version-embed.go version: return correct Meta.MajorMinorPatch in non-dev builds 2 years ago
version_test.go all: update copyright and license headers 2 years ago

README.md

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 1.20. (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 git log for our commit message style. It's basically the same as Go's 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.