mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-29 13:05:46 +00:00
46fd488a6d
There was pre-existing additional usage for Exit Node DNS resolution via PeerAPI, as well as new usage just introduced for App Connectors. Fixes ENG-2324 Updates #cleanup Signed-off-by: James Tucker <james@tailscale.com>
69 lines
2.3 KiB
Go
69 lines
2.3 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
|
|
// SPDX-License-Identifier: BSD-3-Clause
|
|
|
|
// Package dnstype defines types for working with DNS.
|
|
package dnstype
|
|
|
|
//go:generate go run tailscale.com/cmd/viewer --type=Resolver --clonefunc=true
|
|
|
|
import (
|
|
"net/netip"
|
|
"slices"
|
|
)
|
|
|
|
// Resolver is the configuration for one DNS resolver.
|
|
type Resolver struct {
|
|
// Addr is the address of the DNS resolver, one of:
|
|
// - A plain IP address for a "classic" UDP+TCP DNS resolver.
|
|
// This is the common format as sent by the control plane.
|
|
// - An IP:port, for tests.
|
|
// - "https://resolver.com/path" for DNS over HTTPS; currently
|
|
// as of 2022-09-08 only used for certain well-known resolvers
|
|
// (see the publicdns package) for which the IP addresses to dial DoH are
|
|
// known ahead of time, so bootstrap DNS resolution is not required.
|
|
// - "http://node-address:port/path" for DNS over HTTP over WireGuard. This
|
|
// is implemented in the PeerAPI for exit nodes and app connectors.
|
|
// - [TODO] "tls://resolver.com" for DNS over TCP+TLS
|
|
Addr string `json:",omitempty"`
|
|
|
|
// BootstrapResolution is an optional suggested resolution for the
|
|
// DoT/DoH resolver, if the resolver URL does not reference an IP
|
|
// address directly.
|
|
// BootstrapResolution may be empty, in which case clients should
|
|
// look up the DoT/DoH server using their local "classic" DNS
|
|
// resolver.
|
|
//
|
|
// As of 2022-09-08, BootstrapResolution is not yet used.
|
|
BootstrapResolution []netip.Addr `json:",omitempty"`
|
|
}
|
|
|
|
// IPPort returns r.Addr as an IP address and port if either
|
|
// r.Addr is an IP address (the common case) or if r.Addr
|
|
// is an IP:port (as done in tests).
|
|
func (r *Resolver) IPPort() (ipp netip.AddrPort, ok bool) {
|
|
if r.Addr == "" || r.Addr[0] == 'h' || r.Addr[0] == 't' {
|
|
// Fast path to avoid ParseIP error allocation for obviously not IP
|
|
// cases.
|
|
return
|
|
}
|
|
if ip, err := netip.ParseAddr(r.Addr); err == nil {
|
|
return netip.AddrPortFrom(ip, 53), true
|
|
}
|
|
if ipp, err := netip.ParseAddrPort(r.Addr); err == nil {
|
|
return ipp, true
|
|
}
|
|
return
|
|
}
|
|
|
|
// Equal reports whether r and other are equal.
|
|
func (r *Resolver) Equal(other *Resolver) bool {
|
|
if r == nil || other == nil {
|
|
return r == other
|
|
}
|
|
if r == other {
|
|
return true
|
|
}
|
|
|
|
return r.Addr == other.Addr && slices.Equal(r.BootstrapResolution, other.BootstrapResolution)
|
|
}
|