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This file was never truly necessary and has never actually been used in the history of Tailscale's open source releases. A Brief History of AUTHORS files --- The AUTHORS file was a pattern developed at Google, originally for Chromium, then adopted by Go and a bunch of other projects. The problem was that Chromium originally had a copyright line only recognizing Google as the copyright holder. Because Google (and most open source projects) do not require copyright assignemnt for contributions, each contributor maintains their copyright. Some large corporate contributors then tried to add their own name to the copyright line in the LICENSE file or in file headers. This quickly becomes unwieldy, and puts a tremendous burden on anyone building on top of Chromium, since the license requires that they keep all copyright lines intact. The compromise was to create an AUTHORS file that would list all of the copyright holders. The LICENSE file and source file headers would then include that list by reference, listing the copyright holder as "The Chromium Authors". This also become cumbersome to simply keep the file up to date with a high rate of new contributors. Plus it's not always obvious who the copyright holder is. Sometimes it is the individual making the contribution, but many times it may be their employer. There is no way for the proejct maintainer to know. Eventually, Google changed their policy to no longer recommend trying to keep the AUTHORS file up to date proactively, and instead to only add to it when requested: https://opensource.google/docs/releasing/authors. They are also clear that: > Adding contributors to the AUTHORS file is entirely within the > project's discretion and has no implications for copyright ownership. It was primarily added to appease a small number of large contributors that insisted that they be recognized as copyright holders (which was entirely their right to do). But it's not truly necessary, and not even the most accurate way of identifying contributors and/or copyright holders. In practice, we've never added anyone to our AUTHORS file. It only lists Tailscale, so it's not really serving any purpose. It also causes confusion because Tailscalars put the "Tailscale Inc & AUTHORS" header in other open source repos which don't actually have an AUTHORS file, so it's ambiguous what that means. Instead, we just acknowledge that the contributors to Tailscale (whoever they are) are copyright holders for their individual contributions. We also have the benefit of using the DCO (developercertificate.org) which provides some additional certification of their right to make the contribution. The source file changes were purely mechanical with: git ls-files | xargs sed -i -e 's/\(Tailscale Inc &\) AUTHORS/\1 contributors/g' Updates #cleanup Change-Id: Ia101a4a3005adb9118051b3416f5a64a4a45987d Signed-off-by: Will Norris <will@tailscale.com>
104 lines
2.7 KiB
Go
104 lines
2.7 KiB
Go
// Copyright (c) Tailscale Inc & contributors
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// SPDX-License-Identifier: BSD-3-Clause
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package netmon
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import (
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"errors"
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"net"
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"tailscale.com/syncs"
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)
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type ifProps struct {
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mu syncs.Mutex
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name string // interface name, if known/set
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index int // interface index, if known/set
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}
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// tsIfProps tracks the properties (name and index) of the tailscale interface.
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// There is only one tailscale interface per tailscaled instance.
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var tsIfProps ifProps
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func (p *ifProps) tsIfName() string {
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p.mu.Lock()
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defer p.mu.Unlock()
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return p.name
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}
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func (p *ifProps) tsIfIndex() int {
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p.mu.Lock()
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defer p.mu.Unlock()
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return p.index
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}
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func (p *ifProps) set(ifName string, ifIndex int) {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.name = ifName
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p.index = ifIndex
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}
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// TODO (barnstar): This doesn't need the Monitor receiver anymore but we're
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// keeping it for API compatibility to avoid a breaking change. This can be
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// removed when the various clients have switched to SetTailscaleInterfaceProps
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func (m *Monitor) SetTailscaleInterfaceName(ifName string) {
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SetTailscaleInterfaceProps(ifName, 0)
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}
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// SetTailscaleInterfaceProps sets the name of the Tailscale interface and
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// its index for use by various listeners/dialers. If the index is zero,
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// an attempt will be made to look it up by name. This makes no attempt
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// to validate that the interface exists at the time of calling.
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//
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// If this method is called, it is the responsibility of the caller to
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// update the interface name and index if they change.
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//
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// This should be called as early as possible during tailscaled startup.
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func SetTailscaleInterfaceProps(ifName string, ifIndex int) {
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if ifIndex != 0 {
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tsIfProps.set(ifName, ifIndex)
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return
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}
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ifaces, err := net.Interfaces()
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if err != nil {
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return
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}
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for _, iface := range ifaces {
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if iface.Name == ifName {
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ifIndex = iface.Index
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break
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}
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}
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tsIfProps.set(ifName, ifIndex)
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}
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// TailscaleInterfaceName returns the name of the Tailscale interface.
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// For example, "tailscale0", "tun0", "utun3", etc or an error if unset.
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//
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// Callers must handle errors, as the Tailscale interface
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// name may not be set in some environments.
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func TailscaleInterfaceName() (string, error) {
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name := tsIfProps.tsIfName()
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if name == "" {
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return "", errors.New("Tailscale interface name not set")
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}
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return name, nil
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}
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// TailscaleInterfaceIndex returns the index of the Tailscale interface or
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// an error if unset.
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//
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// Callers must handle errors, as the Tailscale interface
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// index may not be set in some environments.
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func TailscaleInterfaceIndex() (int, error) {
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index := tsIfProps.tsIfIndex()
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if index == 0 {
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return 0, errors.New("Tailscale interface index not set")
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}
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return index, nil
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}
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