Will Norris
3ec5be3f51
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>
77 lines
2.7 KiB
Go
77 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 dnstype defines types for working with DNS.
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package dnstype
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//go:generate go run tailscale.com/cmd/viewer --type=Resolver --clonefunc=true
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import (
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"net/netip"
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"slices"
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)
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// Resolver is the configuration for one DNS resolver.
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type Resolver struct {
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// Addr is the address of the DNS resolver, one of:
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// - A plain IP address for a "classic" UDP+TCP DNS resolver.
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// This is the common format as sent by the control plane.
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// - An IP:port, for tests.
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// - "https://resolver.com/path" for DNS over HTTPS; currently
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// as of 2022-09-08 only used for certain well-known resolvers
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// (see the publicdns package) for which the IP addresses to dial DoH are
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// known ahead of time, so bootstrap DNS resolution is not required.
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// - "http://node-address:port/path" for DNS over HTTP over WireGuard. This
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// is implemented in the PeerAPI for exit nodes and app connectors.
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// - [TODO] "tls://resolver.com" for DNS over TCP+TLS
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Addr string `json:",omitempty"`
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// BootstrapResolution is an optional suggested resolution for the
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// DoT/DoH resolver, if the resolver URL does not reference an IP
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// address directly.
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// BootstrapResolution may be empty, in which case clients should
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// look up the DoT/DoH server using their local "classic" DNS
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// resolver.
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//
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// As of 2022-09-08, BootstrapResolution is not yet used.
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BootstrapResolution []netip.Addr `json:",omitempty"`
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// UseWithExitNode designates that this resolver should continue to be used when an
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// exit node is in use. Normally, DNS resolution is delegated to the exit node but
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// there are situations where it is preferable to still use a Split DNS server and/or
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// global DNS server instead of the exit node.
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UseWithExitNode bool `json:",omitempty"`
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}
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// IPPort returns r.Addr as an IP address and port if either
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// r.Addr is an IP address (the common case) or if r.Addr
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// is an IP:port (as done in tests).
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func (r *Resolver) IPPort() (ipp netip.AddrPort, ok bool) {
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if r.Addr == "" || r.Addr[0] == 'h' || r.Addr[0] == 't' {
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// Fast path to avoid ParseIP error allocation for obviously not IP
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// cases.
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return
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}
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if ip, err := netip.ParseAddr(r.Addr); err == nil {
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return netip.AddrPortFrom(ip, 53), true
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}
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if ipp, err := netip.ParseAddrPort(r.Addr); err == nil {
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return ipp, true
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}
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return
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}
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// Equal reports whether r and other are equal.
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func (r *Resolver) Equal(other *Resolver) bool {
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if r == nil || other == nil {
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return r == other
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}
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if r == other {
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return true
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}
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return r.Addr == other.Addr &&
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slices.Equal(r.BootstrapResolution, other.BootstrapResolution) &&
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r.UseWithExitNode == other.UseWithExitNode
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}
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