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net/dns/resolver: factor the resolver out into a sub-package.

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Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson 2021-03-31 21:54:38 -07:00
parent 53cfff109b
commit d99f5b1596
14 changed files with 34 additions and 33 deletions
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1
cmd/tailscaled/depaware.txt
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@ -91,6 +91,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/logtail/filch from tailscale.com/logpolicy
tailscale.com/metrics from tailscale.com/derp
tailscale.com/net/dns from tailscale.com/ipn/ipnlocal+
tailscale.com/net/dns/resolver from tailscale.com/ipn/ipnlocal+
tailscale.com/net/dnscache from tailscale.com/control/controlclient+
tailscale.com/net/dnsfallback from tailscale.com/control/controlclient
tailscale.com/net/flowtrack from tailscale.com/wgengine/filter+

3
ipn/ipnlocal/local.go
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@ -28,6 +28,7 @@ import (
"tailscale.com/ipn/ipnstate"
"tailscale.com/ipn/policy"
"tailscale.com/net/dns"
"tailscale.com/net/dns/resolver"
"tailscale.com/net/interfaces"
"tailscale.com/net/tsaddr"
"tailscale.com/paths"
@ -871,7 +872,7 @@ func (b *LocalBackend) updateDNSMap(netMap *netmap.NetworkMap) {
}
set(netMap.Name, netMap.Addresses)
dnsMap := dns.NewMap(nameToIP, magicDNSRootDomains(netMap))
dnsMap := resolver.NewMap(nameToIP, magicDNSRootDomains(netMap))
// map diff will be logged in dns.Resolver.SetMap.
b.e.SetDNSMap(dnsMap)
}

2
net/dns/forwarder.go → net/dns/resolver/forwarder.go
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@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dns
package resolver
import (
"bytes"

2
net/dns/map.go → net/dns/resolver/map.go
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@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dns
package resolver
import (
"sort"

2
net/dns/map_test.go → net/dns/resolver/map_test.go
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@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dns
package resolver
import (
"fmt"

2
net/dns/neterr_darwin.go → net/dns/resolver/neterr_darwin.go
View File

@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dns
package resolver
import (
"errors"

2
net/dns/neterr_other.go → net/dns/resolver/neterr_other.go
View File

@ -4,7 +4,7 @@
// +build !darwin,!windows
package dns
package resolver
func networkIsDown(err error) bool { return false }
func networkIsUnreachable(err error) bool { return false }

2
net/dns/neterr_windows.go → net/dns/resolver/neterr_windows.go
View File

@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dns
package resolver
import (
"net"

9
net/dns/tsdns.go → net/dns/resolver/tsdns.go
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@ -2,9 +2,8 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package dns provides a Resolver capable of resolving
// domains on a Tailscale network.
package dns
// Package resolver a DNS resolver.
package resolver
import (
"encoding/hex"
@ -96,9 +95,9 @@ type ResolverConfig struct {
LinkMonitor *monitor.Mon
}
// NewResolver constructs a resolver associated with the given root domain.
// New constructs a resolver associated with the given root domain.
// The root domain must be in canonical form (with a trailing period).
func NewResolver(config ResolverConfig) *Resolver {
func New(config ResolverConfig) *Resolver {
r := &Resolver{
logf: logger.WithPrefix(config.Logf, "dns: "),
linkMon: config.LinkMonitor,

2
net/dns/tsdns_server_test.go → net/dns/resolver/tsdns_server_test.go
View File

@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dns
package resolver
import (
"log"

20
net/dns/tsdns_test.go → net/dns/resolver/tsdns_test.go
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@ -2,7 +2,7 @@
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package dns
package resolver
import (
"bytes"
@ -194,7 +194,7 @@ func TestRDNSNameToIPv6(t *testing.T) {
}
func TestResolve(t *testing.T) {
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: false})
r := New(ResolverConfig{Logf: t.Logf, Forward: false})
r.SetMap(dnsMap)
if err := r.Start(); err != nil {
@ -240,7 +240,7 @@ func TestResolve(t *testing.T) {
}
func TestResolveReverse(t *testing.T) {
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: false})
r := New(ResolverConfig{Logf: t.Logf, Forward: false})
r.SetMap(dnsMap)
if err := r.Start(); err != nil {
@ -318,7 +318,7 @@ func TestDelegate(t *testing.T) {
return
}
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: true})
r := New(ResolverConfig{Logf: t.Logf, Forward: true})
r.SetMap(dnsMap)
r.SetUpstreams([]net.Addr{
v4server.PacketConn.LocalAddr(),
@ -397,7 +397,7 @@ func TestDelegateCollision(t *testing.T) {
}
defer server.Shutdown()
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: true})
r := New(ResolverConfig{Logf: t.Logf, Forward: true})
r.SetMap(dnsMap)
r.SetUpstreams([]net.Addr{server.PacketConn.LocalAddr()})
@ -463,7 +463,7 @@ func TestDelegateCollision(t *testing.T) {
}
func TestConcurrentSetMap(t *testing.T) {
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: false})
r := New(ResolverConfig{Logf: t.Logf, Forward: false})
if err := r.Start(); err != nil {
t.Fatalf("start: %v", err)
@ -499,7 +499,7 @@ func TestConcurrentSetUpstreams(t *testing.T) {
}
defer server.Shutdown()
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: true})
r := New(ResolverConfig{Logf: t.Logf, Forward: true})
r.SetMap(dnsMap)
if err := r.Start(); err != nil {
@ -670,7 +670,7 @@ var emptyResponse = []byte{
}
func TestFull(t *testing.T) {
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: false})
r := New(ResolverConfig{Logf: t.Logf, Forward: false})
r.SetMap(dnsMap)
if err := r.Start(); err != nil {
@ -709,7 +709,7 @@ func TestFull(t *testing.T) {
}
func TestAllocs(t *testing.T) {
r := NewResolver(ResolverConfig{Logf: t.Logf, Forward: false})
r := New(ResolverConfig{Logf: t.Logf, Forward: false})
r.SetMap(dnsMap)
if err := r.Start(); err != nil {
@ -778,7 +778,7 @@ func BenchmarkFull(b *testing.B) {
}
defer server.Shutdown()
r := NewResolver(ResolverConfig{Logf: b.Logf, Forward: true})
r := New(ResolverConfig{Logf: b.Logf, Forward: true})
r.SetMap(dnsMap)
r.SetUpstreams([]net.Addr{server.PacketConn.LocalAddr()})

12
wgengine/userspace.go
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@ -29,7 +29,7 @@ import (
"tailscale.com/health"
"tailscale.com/internal/deepprint"
"tailscale.com/ipn/ipnstate"
"tailscale.com/net/dns"
"tailscale.com/net/dns/resolver"
"tailscale.com/net/flowtrack"
"tailscale.com/net/interfaces"
"tailscale.com/net/packet"
@ -83,7 +83,7 @@ type userspaceEngine struct {
tundev *tstun.Wrapper
wgdev *device.Device
router router.Router
resolver *dns.Resolver
resolver *resolver.Resolver
magicConn *magicsock.Conn
linkMon *monitor.Mon
linkMonOwned bool // whether we created linkMon (and thus need to close it)
@ -219,7 +219,7 @@ func NewUserspaceEngine(logf logger.Logf, conf Config) (_ Engine, reterr error)
e.linkMonOwned = true
}
e.resolver = dns.NewResolver(dns.ResolverConfig{
e.resolver = resolver.New(resolver.ResolverConfig{
Logf: logf,
Forward: true,
LinkMonitor: e.linkMon,
@ -435,7 +435,7 @@ func (e *userspaceEngine) handleLocalPackets(p *packet.Parsed, t *tstun.Wrapper)
// handleDNS is an outbound pre-filter resolving Tailscale domains.
func (e *userspaceEngine) handleDNS(p *packet.Parsed, t *tstun.Wrapper) filter.Response {
if p.Dst.IP == magicDNSIP && p.Dst.Port == magicDNSPort && p.IPProto == ipproto.UDP {
request := dns.Packet{
request := resolver.Packet{
Payload: append([]byte(nil), p.Payload()...),
Addr: netaddr.IPPort{IP: p.Src.IP, Port: p.Src.Port},
}
@ -452,7 +452,7 @@ func (e *userspaceEngine) handleDNS(p *packet.Parsed, t *tstun.Wrapper) filter.R
func (e *userspaceEngine) pollResolver() {
for {
resp, err := e.resolver.NextResponse()
if err == dns.ErrClosed {
if err == resolver.ErrClosed {
return
}
if err != nil {
@ -1024,7 +1024,7 @@ func (e *userspaceEngine) SetFilter(filt *filter.Filter) {
e.tundev.SetFilter(filt)
}
func (e *userspaceEngine) SetDNSMap(dm *dns.Map) {
func (e *userspaceEngine) SetDNSMap(dm *resolver.Map) {
e.resolver.SetMap(dm)
}

4
wgengine/watchdog.go
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@ -14,7 +14,7 @@ import (
"inet.af/netaddr"
"tailscale.com/ipn/ipnstate"
"tailscale.com/net/dns"
"tailscale.com/net/dns/resolver"
"tailscale.com/net/tstun"
"tailscale.com/tailcfg"
"tailscale.com/types/netmap"
@ -86,7 +86,7 @@ func (e *watchdogEngine) GetFilter() *filter.Filter {
func (e *watchdogEngine) SetFilter(filt *filter.Filter) {
e.watchdog("SetFilter", func() { e.wrap.SetFilter(filt) })
}
func (e *watchdogEngine) SetDNSMap(dm *dns.Map) {
func (e *watchdogEngine) SetDNSMap(dm *resolver.Map) {
e.watchdog("SetDNSMap", func() { e.wrap.SetDNSMap(dm) })
}
func (e *watchdogEngine) SetStatusCallback(cb StatusCallback) {

4
wgengine/wgengine.go
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@ -9,7 +9,7 @@ import (
"inet.af/netaddr"
"tailscale.com/ipn/ipnstate"
"tailscale.com/net/dns"
"tailscale.com/net/dns/resolver"
"tailscale.com/tailcfg"
"tailscale.com/types/netmap"
"tailscale.com/wgengine/filter"
@ -66,7 +66,7 @@ type Engine interface {
SetFilter(*filter.Filter)
// SetDNSMap updates the DNS map.
SetDNSMap(*dns.Map)
SetDNSMap(*resolver.Map)
// SetStatusCallback sets the function to call when the
// WireGuard status changes.