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appc,ipn/ipnlocal,net/dns/resolver: add App Connector wiring when enabled in prefs 

An EmbeddedAppConnector is added that when configured observes DNS
responses from the PeerAPI. If a response is found matching a configured
domain, routes are advertised when necessary.

The wiring from a configuration in the netmap capmap is not yet done, so
while the connector can be enabled, no domains can yet be added.

Updates tailscale/corp#15437

Signed-off-by: James Tucker <james@tailscale.com>
This commit is contained in:
James Tucker 2023-10-27 14:20:10 -07:00 committed by James Tucker
parent e7482f0df0
commit b48b7d82d0
9 changed files with 518 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
appc/appc.go
View File

@ -31,7 +31,7 @@ type target struct {
Matching tailcfg.ProtoPortRange
}
// Server implements an App Connector.
// Server implements an App Connector as expressed in sniproxy.
type Server struct {
mu sync.RWMutex // mu guards following fields
connectors map[appctype.ConfigID]connector

165
appc/embedded.go Normal file
View File

@ -0,0 +1,165 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
// Package appc implements App Connectors. An AppConnector provides domain
// oriented routing of traffic.
package appc
import (
"net/netip"
"slices"
"strings"
"sync"
"golang.org/x/net/dns/dnsmessage"
"tailscale.com/types/logger"
)
/*
* TODO(raggi): the sniproxy servicing portions of this package will be moved
* into the sniproxy or deprecated at some point, when doing so is not
* disruptive. At that time EmbeddedAppConnector can be renamed to AppConnector.
*/
// RouteAdvertiser is an interface that allows the AppConnector to advertise
// newly discovered routes that need to be served through the AppConnector.
type RouteAdvertiser interface {
// AdvertiseRoute adds a new route advertisement if the route is not already
// being advertised.
AdvertiseRoute(netip.Prefix) error
}
// EmbeddedAppConnector is an implementation of an AppConnector that performs
// its function as a subsystem inside of a tailscale node. At the control plane
// side App Connector routing is configured in terms of domains rather than IP
// addresses.
// The AppConnectors responsibility inside tailscaled is to apply the routing
// and domain configuration as supplied in the map response.
// DNS requests for configured domains are observed. If the domains resolve to
// routes not yet served by the AppConnector the local node configuration is
// updated to advertise the new route.
type EmbeddedAppConnector struct {
logf logger.Logf
routeAdvertiser RouteAdvertiser
// mu guards the fields that follow
mu sync.Mutex
// domains is a map of lower case domain names with no trailing dot, to a
// list of resolved IP addresses.
domains map[string][]netip.Addr
}
// NewEmbeddedAppConnector creates a new EmbeddedAppConnector.
func NewEmbeddedAppConnector(logf logger.Logf, routeAdvertiser RouteAdvertiser) *EmbeddedAppConnector {
return &EmbeddedAppConnector{
logf: logger.WithPrefix(logf, "appc: "),
routeAdvertiser: routeAdvertiser,
}
}
// UpdateDomains replaces the current set of configured domains with the
// supplied set of domains. Domains must not contain a trailing dot, and should
// be lower case.
func (e *EmbeddedAppConnector) UpdateDomains(domains []string) {
e.mu.Lock()
defer e.mu.Unlock()
var old map[string][]netip.Addr
old, e.domains = e.domains, make(map[string][]netip.Addr, len(domains))
for _, d := range domains {
d = strings.ToLower(d)
e.domains[d] = old[d]
}
}
// ObserveDNSResponse is a callback invoked by the DNS resolver when a DNS
// response is being returned over the PeerAPI. The response is parsed and
// matched against the configured domains, if matched the routeAdvertiser is
// advised to advertise the discovered route.
func (e *EmbeddedAppConnector) ObserveDNSResponse(res []byte) {
var p dnsmessage.Parser
if _, err := p.Start(res); err != nil {
return
}
if err := p.SkipAllQuestions(); err != nil {
return
}
for {
h, err := p.AnswerHeader()
if err == dnsmessage.ErrSectionDone {
break
}
if err != nil {
return
}
if h.Class != dnsmessage.ClassINET {
if err := p.SkipAnswer(); err != nil {
return
}
continue
}
if h.Type != dnsmessage.TypeA && h.Type != dnsmessage.TypeAAAA {
if err := p.SkipAnswer(); err != nil {
return
}
continue
}
domain := h.Name.String()
if len(domain) == 0 {
return
}
if domain[len(domain)-1] == '.' {
domain = domain[:len(domain)-1]
}
domain = strings.ToLower(domain)
e.logf("[v2] observed DNS response for %s", domain)
e.mu.Lock()
addrs, ok := e.domains[domain]
e.mu.Unlock()
if !ok {
if err := p.SkipAnswer(); err != nil {
return
}
continue
}
var addr netip.Addr
switch h.Type {
case dnsmessage.TypeA:
r, err := p.AResource()
if err != nil {
return
}
addr = netip.AddrFrom4(r.A)
case dnsmessage.TypeAAAA:
r, err := p.AAAAResource()
if err != nil {
return
}
addr = netip.AddrFrom16(r.AAAA)
default:
if err := p.SkipAnswer(); err != nil {
return
}
continue
}
if slices.Contains(addrs, addr) {
continue
}
// TODO(raggi): check for existing prefixes
if err := e.routeAdvertiser.AdvertiseRoute(netip.PrefixFrom(addr, addr.BitLen())); err != nil {
e.logf("failed to advertise route for %v: %v", addr, err)
continue
}
e.logf("[v2] advertised route for %v: %v", domain, addr)
e.mu.Lock()
e.domains[domain] = append(addrs, addr)
e.mu.Unlock()
}
}

118
appc/embedded_test.go Normal file
View File

@ -0,0 +1,118 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package appc
import (
"net/netip"
"slices"
"testing"
xmaps "golang.org/x/exp/maps"
"golang.org/x/net/dns/dnsmessage"
"tailscale.com/util/must"
)
func TestUpdateDomains(t *testing.T) {
a := NewEmbeddedAppConnector(t.Logf, nil)
a.UpdateDomains([]string{"example.com"})
if got, want := xmaps.Keys(a.domains), []string{"example.com"}; !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
addr := netip.MustParseAddr("192.0.0.8")
a.domains["example.com"] = append(a.domains["example.com"], addr)
a.UpdateDomains([]string{"example.com"})
if got, want := a.domains["example.com"], []netip.Addr{addr}; !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
// domains are explicitly downcased on set.
a.UpdateDomains([]string{"UP.EXAMPLE.COM"})
if got, want := xmaps.Keys(a.domains), []string{"up.example.com"}; !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
}
func TestObserveDNSResponse(t *testing.T) {
rc := &routeCollector{}
a := NewEmbeddedAppConnector(t.Logf, rc)
// a has no domains configured, so it should not advertise any routes
a.ObserveDNSResponse(dnsResponse("example.com.", "192.0.0.8"))
if got, want := rc.routes, ([]netip.Prefix)(nil); !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
wantRoutes := []netip.Prefix{netip.MustParsePrefix("192.0.0.8/32")}
a.UpdateDomains([]string{"example.com"})
a.ObserveDNSResponse(dnsResponse("example.com.", "192.0.0.8"))
if got, want := rc.routes, wantRoutes; !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
wantRoutes = append(wantRoutes, netip.MustParsePrefix("2001:db8::1/128"))
a.ObserveDNSResponse(dnsResponse("example.com.", "2001:db8::1"))
if got, want := rc.routes, wantRoutes; !slices.Equal(got, want) {
t.Errorf("got %v; want %v", got, want)
}
// don't re-advertise routes that have already been advertised
a.ObserveDNSResponse(dnsResponse("example.com.", "2001:db8::1"))
if !slices.Equal(rc.routes, wantRoutes) {
t.Errorf("got %v; want %v", rc.routes, wantRoutes)
}
}
// dnsResponse is a test helper that creates a DNS response buffer for the given domain and address
func dnsResponse(domain, address string) []byte {
addr := netip.MustParseAddr(address)
b := dnsmessage.NewBuilder(nil, dnsmessage.Header{})
b.EnableCompression()
b.StartAnswers()
switch addr.BitLen() {
case 32:
b.AResource(
dnsmessage.ResourceHeader{
Name: dnsmessage.MustNewName(domain),
Type: dnsmessage.TypeA,
Class: dnsmessage.ClassINET,
TTL: 0,
},
dnsmessage.AResource{
A: addr.As4(),
},
)
case 128:
b.AAAAResource(
dnsmessage.ResourceHeader{
Name: dnsmessage.MustNewName(domain),
Type: dnsmessage.TypeAAAA,
Class: dnsmessage.ClassINET,
TTL: 0,
},
dnsmessage.AAAAResource{
AAAA: addr.As16(),
},
)
default:
panic("invalid address length")
}
return must.Get(b.Finish())
}
// routeCollector is a test helper that collects the list of routes advertised
type routeCollector struct {
routes []netip.Prefix
}
// routeCollector implements RouteAdvertiser
var _ RouteAdvertiser = (*routeCollector)(nil)
func (rc *routeCollector) AdvertiseRoute(pfx netip.Prefix) error {
rc.routes = append(rc.routes, pfx)
return nil
}

5
cmd/tailscaled/depaware.txt
View File

@ -216,11 +216,13 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
gvisor.dev/gvisor/pkg/tcpip/transport/udp from tailscale.com/net/tstun+
gvisor.dev/gvisor/pkg/waiter from gvisor.dev/gvisor/pkg/context+
inet.af/peercred from tailscale.com/ipn/ipnauth
inet.af/tcpproxy from tailscale.com/appc
W 💣 inet.af/wf from tailscale.com/wf
nhooyr.io/websocket from tailscale.com/derp/derphttp+
nhooyr.io/websocket/internal/errd from nhooyr.io/websocket
nhooyr.io/websocket/internal/xsync from nhooyr.io/websocket
tailscale.com from tailscale.com/version
tailscale.com/appc from tailscale.com/ipn/ipnlocal
tailscale.com/atomicfile from tailscale.com/ipn+
LD tailscale.com/chirp from tailscale.com/cmd/tailscaled
tailscale.com/client/tailscale from tailscale.com/derp+
@ -269,7 +271,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/net/dns/publicdns from tailscale.com/net/dns/resolver+
tailscale.com/net/dns/recursive from tailscale.com/net/dnsfallback
tailscale.com/net/dns/resolvconffile from tailscale.com/net/dns+
tailscale.com/net/dns/resolver from tailscale.com/ipn/ipnlocal+
tailscale.com/net/dns/resolver from tailscale.com/net/dns
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/net/packet+
@ -319,6 +321,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
tailscale.com/tstime/mono from tailscale.com/net/tstun+
tailscale.com/tstime/rate from tailscale.com/wgengine/filter+
tailscale.com/tsweb/varz from tailscale.com/cmd/tailscaled
tailscale.com/types/appctype from tailscale.com/appc
tailscale.com/types/dnstype from tailscale.com/ipn/ipnlocal+
tailscale.com/types/empty from tailscale.com/ipn+
tailscale.com/types/flagtype from tailscale.com/cmd/tailscaled

50
ipn/ipnlocal/local.go
View File

@ -32,6 +32,7 @@ import (
"go4.org/netipx"
xmaps "golang.org/x/exp/maps"
"gvisor.dev/gvisor/pkg/tcpip"
"tailscale.com/appc"
"tailscale.com/client/tailscale/apitype"
"tailscale.com/control/controlclient"
"tailscale.com/control/controlknobs"
@ -206,6 +207,7 @@ type LocalBackend struct {
httpTestClient *http.Client // for controlclient. nil by default, used by tests.
ccGen clientGen // function for producing controlclient; lazily populated
sshServer SSHServer // or nil, initialized lazily.
appConnector *appc.EmbeddedAppConnector // or nil, initialized when configured.
webClient webClient
notify func(ipn.Notify)
cc controlclient.Client
@ -2995,6 +2997,9 @@ func (b *LocalBackend) setPrefsLockedOnEntry(caller string, newp *ipn.Prefs) ipn
oldHi := b.hostinfo
newHi := oldHi.Clone()
if newHi == nil {
newHi = new(tailcfg.Hostinfo)
}
b.applyPrefsToHostinfoLocked(newHi, newp.View())
b.hostinfo = newHi
hostInfoChanged := !oldHi.Equal(newHi)
@ -3240,6 +3245,10 @@ func (b *LocalBackend) authReconfig() {
disableSubnetsIfPAC := hasCapability(nm, tailcfg.NodeAttrDisableSubnetsIfPAC)
dohURL, dohURLOK := exitNodeCanProxyDNS(nm, b.peers, prefs.ExitNodeID())
dcfg := dnsConfigForNetmap(nm, b.peers, prefs, b.logf, version.OS())
// If the current node is an app connector, ensure the app connector machine is started
if prefs.AppConnector().Advertise && b.appConnector == nil {
b.appConnector = appc.NewEmbeddedAppConnector(b.logf, b)
}
b.mu.Unlock()
if blocked {
@ -4812,6 +4821,14 @@ func (b *LocalBackend) OfferingExitNode() bool {
return def4 && def6
}
// OfferingAppConnector reports whether b is currently offering app
// connector services.
func (b *LocalBackend) OfferingAppConnector() bool {
b.mu.Lock()
defer b.mu.Unlock()
return b.appConnector != nil
}
// allowExitNodeDNSProxyToServeName reports whether the Exit Node DNS
// proxy is allowed to serve responses for the provided DNS name.
func (b *LocalBackend) allowExitNodeDNSProxyToServeName(name string) bool {
@ -5398,6 +5415,39 @@ func (b *LocalBackend) DebugBreakDERPConns() error {
return b.magicConn().DebugBreakDERPConns()
}
// ObserveDNSResponse passes a DNS response from the PeerAPI DNS server to the
// App Connector to enable route discovery.
func (b *LocalBackend) ObserveDNSResponse(res []byte) {
var appConnector *appc.EmbeddedAppConnector
b.mu.Lock()
if b.appConnector == nil {
b.mu.Unlock()
return
}
appConnector = b.appConnector
b.mu.Unlock()
appConnector.ObserveDNSResponse(res)
}
// AdvertiseRoute implements the appc.RouteAdvertiser interface. It sets a new
// route advertisement if one is not already present in the existing routes.
func (b *LocalBackend) AdvertiseRoute(ipp netip.Prefix) error {
currentRoutes := b.Prefs().AdvertiseRoutes()
// TODO(raggi): check if the new route is a subset of an existing route.
if currentRoutes.ContainsFunc(func(r netip.Prefix) bool { return r == ipp }) {
return nil
}
routes := append(currentRoutes.AsSlice(), ipp)
_, err := b.EditPrefs(&ipn.MaskedPrefs{
Prefs: ipn.Prefs{
AdvertiseRoutes: routes,
},
AdvertiseRoutesSet: true,
})
return err
}
// mayDeref dereferences p if non-nil, otherwise it returns the zero value.
func mayDeref[T any](p *T) (v T) {
if p == nil {

92
ipn/ipnlocal/local_test.go
View File

@ -10,10 +10,13 @@ import (
"net/http"
"net/netip"
"reflect"
"slices"
"testing"
"time"
"go4.org/netipx"
"golang.org/x/net/dns/dnsmessage"
"tailscale.com/appc"
"tailscale.com/control/controlclient"
"tailscale.com/ipn"
"tailscale.com/ipn/store/mem"
@ -30,6 +33,7 @@ import (
"tailscale.com/types/ptr"
"tailscale.com/util/dnsname"
"tailscale.com/util/mak"
"tailscale.com/util/must"
"tailscale.com/util/set"
"tailscale.com/wgengine"
"tailscale.com/wgengine/filter"
@ -1142,6 +1146,47 @@ func TestDNSConfigForNetmapForExitNodeConfigs(t *testing.T) {
}
}
func TestOfferingAppConnector(t *testing.T) {
b := newTestBackend(t)
if b.OfferingAppConnector() {
t.Fatal("unexpected offering app connector")
}
b.appConnector = appc.NewEmbeddedAppConnector(t.Logf, nil)
if !b.OfferingAppConnector() {
t.Fatal("unexpected not offering app connector")
}
}
func TestRouteAdvertiser(t *testing.T) {
b := newTestBackend(t)
testPrefix := netip.MustParsePrefix("192.0.0.8/32")
ra := appc.RouteAdvertiser(b)
must.Do(ra.AdvertiseRoute(testPrefix))
routes := b.Prefs().AdvertiseRoutes()
if routes.Len() != 1 || routes.At(0) != testPrefix {
t.Fatalf("got routes %v, want %v", routes, []netip.Prefix{testPrefix})
}
}
func TestObserveDNSResponse(t *testing.T) {
b := newTestBackend(t)
// ensure no error when no app connector is configured
b.ObserveDNSResponse(dnsResponse("example.com.", "192.0.0.8"))
rc := &routeCollector{}
b.appConnector = appc.NewEmbeddedAppConnector(t.Logf, rc)
b.appConnector.UpdateDomains([]string{"example.com"})
b.ObserveDNSResponse(dnsResponse("example.com.", "192.0.0.8"))
wantRoutes := []netip.Prefix{netip.MustParsePrefix("192.0.0.8/32")}
if !slices.Equal(rc.routes, wantRoutes) {
t.Fatalf("got routes %v, want %v", rc.routes, wantRoutes)
}
}
func resolversEqual(t *testing.T, a, b []*dnstype.Resolver) bool {
if a == nil && b == nil {
return true
@ -1176,3 +1221,50 @@ func routesEqual(t *testing.T, a, b map[dnsname.FQDN][]*dnstype.Resolver) bool {
}
return true
}
// dnsResponse is a test helper that creates a DNS response buffer for the given domain and address
func dnsResponse(domain, address string) []byte {
addr := netip.MustParseAddr(address)
b := dnsmessage.NewBuilder(nil, dnsmessage.Header{})
b.EnableCompression()
b.StartAnswers()
switch addr.BitLen() {
case 32:
b.AResource(
dnsmessage.ResourceHeader{
Name: dnsmessage.MustNewName(domain),
Type: dnsmessage.TypeA,
Class: dnsmessage.ClassINET,
TTL: 0,
},
dnsmessage.AResource{
A: addr.As4(),
},
)
case 128:
b.AAAAResource(
dnsmessage.ResourceHeader{
Name: dnsmessage.MustNewName(domain),
Type: dnsmessage.TypeAAAA,
Class: dnsmessage.ClassINET,
TTL: 0,
},
dnsmessage.AAAAResource{
AAAA: addr.As16(),
},
)
default:
panic("invalid address length")
}
return must.Get(b.Finish())
}
// routeCollector is a test helper that collects the list of routes advertised
type routeCollector struct {
routes []netip.Prefix
}
func (rc *routeCollector) AdvertiseRoute(pfx netip.Prefix) error {
rc.routes = append(rc.routes, pfx)
return nil
}

23
ipn/ipnlocal/peerapi.go
View File

@ -32,7 +32,6 @@ import (
"tailscale.com/health"
"tailscale.com/hostinfo"
"tailscale.com/ipn"
"tailscale.com/net/dns/resolver"
"tailscale.com/net/interfaces"
"tailscale.com/net/netaddr"
"tailscale.com/net/netutil"
@ -51,9 +50,14 @@ var initListenConfig func(*net.ListenConfig, netip.Addr, *interfaces.State, stri
// ("cleartext" HTTP/2) support to the peerAPI.
var addH2C func(*http.Server)
// peerDNSQueryHandler is implemented by tsdns.Resolver.
type peerDNSQueryHandler interface {
HandlePeerDNSQuery(context.Context, []byte, netip.AddrPort, func(name string) bool) (res []byte, err error)
}
type peerAPIServer struct {
b *LocalBackend
resolver *resolver.Resolver
resolver peerDNSQueryHandler
taildrop *taildrop.Manager
}
@ -861,9 +865,9 @@ func (h *peerAPIHandler) replyToDNSQueries() bool {
return true
}
b := h.ps.b
if !b.OfferingExitNode() {
// If we're not an exit node, there's no point to
// being a DNS server for somebody.
if !b.OfferingExitNode() && !b.OfferingAppConnector() {
// If we're not an exit node or app connector, there's
// no point to being a DNS server for somebody.
return false
}
if !h.remoteAddr.IsValid() {
@ -927,7 +931,7 @@ func (h *peerAPIHandler) handleDNSQuery(w http.ResponseWriter, r *http.Request)
ctx, cancel := context.WithTimeout(r.Context(), arbitraryTimeout)
defer cancel()
res, err := h.ps.resolver.HandleExitNodeDNSQuery(ctx, q, h.remoteAddr, h.ps.b.allowExitNodeDNSProxyToServeName)
res, err := h.ps.resolver.HandlePeerDNSQuery(ctx, q, h.remoteAddr, h.ps.b.allowExitNodeDNSProxyToServeName)
if err != nil {
h.logf("handleDNS fwd error: %v", err)
if err := ctx.Err(); err != nil {
@ -937,6 +941,13 @@ func (h *peerAPIHandler) handleDNSQuery(w http.ResponseWriter, r *http.Request)
}
return
}
// TODO(raggi): consider pushing the integration down into the resolver
// instead to avoid re-parsing the DNS response for improved performance in
// the future.
if h.ps.b.OfferingAppConnector() {
h.ps.b.ObserveDNSResponse(res)
}
if pretty {
// Non-standard response for interactive debugging.
w.Header().Set("Content-Type", "application/json")

64
ipn/ipnlocal/peerapi_test.go
View File

@ -5,6 +5,7 @@ package ipnlocal
import (
"bytes"
"context"
"fmt"
"io"
"io/fs"
@ -14,11 +15,14 @@ import (
"net/netip"
"os"
"path/filepath"
"slices"
"strings"
"testing"
"github.com/google/go-cmp/cmp"
"go4.org/netipx"
"golang.org/x/net/dns/dnsmessage"
"tailscale.com/appc"
"tailscale.com/client/tailscale/apitype"
"tailscale.com/ipn"
"tailscale.com/ipn/store/mem"
@ -680,3 +684,63 @@ func TestPeerAPIReplyToDNSQueries(t *testing.T) {
t.Errorf("unexpectedly IPv6 deny; wanted to be a DNS server")
}
}
func TestPeerAPIReplyToDNSQueriesAreObserved(t *testing.T) {
var h peerAPIHandler
h.remoteAddr = netip.MustParseAddrPort("100.150.151.152:12345")
rc := &routeCollector{}
eng, _ := wgengine.NewFakeUserspaceEngine(logger.Discard, 0)
pm := must.Get(newProfileManager(new(mem.Store), t.Logf))
h.ps = &peerAPIServer{
b: &LocalBackend{
e: eng,
pm: pm,
store: pm.Store(),
appConnector: appc.NewEmbeddedAppConnector(t.Logf, rc),
},
}
h.ps.b.appConnector.UpdateDomains([]string{"example.com"})
h.ps.resolver = &fakeResolver{}
f := filter.NewAllowAllForTest(logger.Discard)
h.ps.b.setFilter(f)
if !h.ps.b.OfferingAppConnector() {
t.Fatal("expecting to be offering app connector")
}
if !h.replyToDNSQueries() {
t.Errorf("unexpectedly deny; wanted to be a DNS server")
}
w := httptest.NewRecorder()
h.handleDNSQuery(w, httptest.NewRequest("GET", "/dns-query?q=true&t=example.com.", nil))
if w.Code != http.StatusOK {
t.Errorf("unexpected status code: %v", w.Code)
}
wantRoutes := []netip.Prefix{netip.MustParsePrefix("192.0.0.8/32")}
if !slices.Equal(rc.routes, wantRoutes) {
t.Errorf("got %v; want %v", rc.routes, wantRoutes)
}
}
type fakeResolver struct{}
func (f *fakeResolver) HandlePeerDNSQuery(ctx context.Context, q []byte, from netip.AddrPort, allowName func(name string) bool) (res []byte, err error) {
b := dnsmessage.NewBuilder(nil, dnsmessage.Header{})
b.EnableCompression()
b.StartAnswers()
b.AResource(
dnsmessage.ResourceHeader{
Name: dnsmessage.MustNewName("example.com."),
Type: dnsmessage.TypeA,
Class: dnsmessage.ClassINET,
TTL: 0,
},
dnsmessage.AResource{
A: [4]byte{192, 0, 0, 8},
},
)
return b.Finish()
}

8
net/dns/resolver/tsdns.go
View File

@ -314,9 +314,9 @@ func parseExitNodeQuery(q []byte) *response {
return p.response()
}
// HandleExitNodeDNSQuery handles a DNS query that arrived from a peer
// via the peerapi's DoH server. This is only used when the local
// node is being an exit node.
// HandlePeerDNSQuery handles a DNS query that arrived from a peer
// via the peerapi's DoH server. This is used when the local
// node is being an exit node or an app connector.
//
// The provided allowName callback is whether a DNS query for a name
// (as found by parsing q) is allowed.
@ -325,7 +325,7 @@ func parseExitNodeQuery(q []byte) *response {
// still result in a response DNS packet (saying there's a failure)
// and a nil error.
// TODO: figure out if we even need an error result.
func (r *Resolver) HandleExitNodeDNSQuery(ctx context.Context, q []byte, from netip.AddrPort, allowName func(name string) bool) (res []byte, err error) {
func (r *Resolver) HandlePeerDNSQuery(ctx context.Context, q []byte, from netip.AddrPort, allowName func(name string) bool) (res []byte, err error) {
metricDNSExitProxyQuery.Add(1)
ch := make(chan packet, 1)