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James Tucker 9ed3a061c3 net/netns: fix segv when no tailscale interface is found `interfaces.Tailscale()` returns all zero values when it finds no Tailscale interface and encounters no errors. The netns package was treating no error as a signal that it would receive a non-zero pointer value leading to nil pointer dereference. Observed in: ``` --- FAIL: TestGetInterfaceIndex (0.00s) --- FAIL: TestGetInterfaceIndex/IP_and_port (0.00s) panic: runtime error: invalid memory address or nil pointer dereference [recovered] panic: runtime error: invalid memory address or nil pointer dereference [signal SIGSEGV: segmentation violation code=0x2 addr=0x0 pc=0x1029eb7d8] goroutine 7 [running]: testing.tRunner.func1.2({0x102a691e0, 0x102bc05c0}) /Users/raggi/.cache/tailscale-go/src/testing/testing.go:1526 +0x1c8 testing.tRunner.func1() /Users/raggi/.cache/tailscale-go/src/testing/testing.go:1529 +0x384 panic({0x102a691e0, 0x102bc05c0}) /Users/raggi/.cache/tailscale-go/src/runtime/panic.go:884 +0x204 tailscale.com/net/netns.getInterfaceIndex(0x14000073f28, 0x1028d0284?, {0x1029ef3b7, 0xa}) /Users/raggi/src/github.com/tailscale/tailscale/net/netns/netns_darwin.go:114 +0x228 tailscale.com/net/netns.TestGetInterfaceIndex.func2(0x14000138000) /Users/raggi/src/github.com/tailscale/tailscale/net/netns/netns_darwin_test.go:37 +0x54 testing.tRunner(0x14000138000, 0x140000551b0) /Users/raggi/.cache/tailscale-go/src/testing/testing.go:1576 +0x10c created by testing.(*T).Run /Users/raggi/.cache/tailscale-go/src/testing/testing.go:1629 +0x368 FAIL tailscale.com/net/netns 0.824s ``` Fixes #8064 Signed-off-by: James Tucker <jftucker@gmail.com>		2 years ago
.bencher	…
.github	.github: mark bots for exemption by issuebot (#8041 )	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	tsd: add package with System type to unify subsystem init, discovery	2 years ago
control	control/controlclient: use dnscache.Resolver for Noise client	2 years ago
derp	derp: add a README.md with some docs	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: support tailscaled-env.txt on macOS too	2 years ago
health	health, net/tlsdial: add healthcheck for self-signed cert	2 years ago
hostinfo	various: add detection and Taildrop for Unraid	2 years ago
internal/tooldeps	various: add golangci-lint, fix issues (#7905 )	2 years ago
ipn	tsd: add package with System type to unify subsystem init, discovery	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 tailscale{,d} 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/netns: fix segv when no tailscale interface is found	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.sh: check connectivity with pkgs.tailscale.com	2 years ago
smallzstd	all: update copyright and license headers	2 years ago
ssh/tailssh	tsd: add package with System type to unify subsystem init, discovery	2 years ago
syncs	syncs: add Map.Len to get the length of the Map	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
tsd	tsd: add package with System type to unify subsystem init, discovery	2 years ago
tsnet	tsd: add package with System type to unify subsystem init, discovery	2 years ago
tstest	tsd: add package with System type to unify subsystem init, discovery	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	net/packet: add NAT support for DCCP and GRE	2 years ago
util	various: add golangci-lint, fix issues (#7905 )	2 years ago
version	various: add detection and Taildrop for Unraid	2 years ago
wf	all: update copyright and license headers	2 years ago
wgengine	tsd: add package with System type to unify subsystem init, discovery	2 years ago
words	words: charlotte 1 spell-checking-linter 0 (#7993 )	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 v1.41.0	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 for env CC specified	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	go.mod: bump goreleaser deps	2 years ago
go.mod.sri	go.mod.sri: update SRI hash for go.mod changes	2 years ago
go.sum	go.mod: bump goreleaser deps	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	…
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:

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 1.20. (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:

Legal

WireGuard is a registered trademark of Jason A. Donenfeld.