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types/dnstype: introduce new package for Resolver

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So the type can be used in net/dns without introducing a tailcfg
dependency.

For #2596

Signed-off-by: David Crawshaw <crawshaw@tailscale.com>
This commit is contained in:
David Crawshaw
2021-08-05 14:05:24 -07:00
committed by David Crawshaw
parent 4d19db7c9f
commit 360223fccb
8 changed files with 107 additions and 71 deletions
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26
tailcfg/tailcfg.go
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@@ -4,7 +4,7 @@
package tailcfg
//go:generate go run tailscale.com/cmd/cloner --type=User,Node,Hostinfo,NetInfo,Login,DNSConfig,DNSResolver,RegisterResponse,DERPRegion,DERPMap,DERPNode --clonefunc=true --output=tailcfg_clone.go
//go:generate go run tailscale.com/cmd/cloner --type=User,Node,Hostinfo,NetInfo,Login,DNSConfig,RegisterResponse,DERPRegion,DERPMap,DERPNode --clonefunc=true --output=tailcfg_clone.go
import (
"encoding/hex"
@@ -16,6 +16,7 @@ import (
"go4.org/mem"
"inet.af/netaddr"
"tailscale.com/types/dnstype"
"tailscale.com/types/key"
"tailscale.com/types/opt"
"tailscale.com/types/structs"
@@ -832,38 +833,21 @@ var FilterAllowAll = []FilterRule{
},
}
// DNSResolver is the configuration for one DNS resolver.
type DNSResolver struct {
// Addr is the address of the DNS resolver, one of:
// - A plain IP address for a "classic" UDP+TCP DNS resolver
// - [TODO] "tls://resolver.com" for DNS over TCP+TLS
// - [TODO] "https://resolver.com/query-tmpl" for DNS over HTTPS
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.
BootstrapResolution []netaddr.IP `json:",omitempty"`
}
// DNSConfig is the DNS configuration.
type DNSConfig struct {
// Resolvers are the DNS resolvers to use, in order of preference.
Resolvers []DNSResolver `json:",omitempty"`
Resolvers []dnstype.Resolver `json:",omitempty"`
// Routes maps DNS name suffixes to a set of DNS resolvers to
// use. It is used to implement "split DNS" and other advanced DNS
// routing overlays.
// Map keys must be fully-qualified DNS name suffixes, with a
// trailing dot but no leading dot.
Routes map[string][]DNSResolver `json:",omitempty"`
Routes map[string][]dnstype.Resolver `json:",omitempty"`
// FallbackResolvers is like Resolvers, but is only used if a
// split DNS configuration is requested in a configuration that
// doesn't work yet without explicit default resolvers.
// https://github.com/tailscale/tailscale/issues/1743
FallbackResolvers []DNSResolver `json:",omitempty"`
FallbackResolvers []dnstype.Resolver `json:",omitempty"`
// Domains are the search domains to use.
// Search domains must be FQDNs, but *without* the trailing dot.
Domains []string `json:",omitempty"`