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tailscale/ipn/ipnlocal/peerapi_test.go

883 lines
23 KiB
Go

// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package ipnlocal
import (
"bytes"
"context"
"encoding/json"
"fmt"
"io"
"io/fs"
"math/rand"
"net/http"
"net/http/httptest"
"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/appc/appctest"
"tailscale.com/client/tailscale/apitype"
"tailscale.com/ipn"
"tailscale.com/ipn/store/mem"
"tailscale.com/tailcfg"
"tailscale.com/taildrop"
"tailscale.com/tstest"
"tailscale.com/types/logger"
"tailscale.com/types/netmap"
"tailscale.com/util/must"
"tailscale.com/wgengine"
"tailscale.com/wgengine/filter"
)
type peerAPITestEnv struct {
ph *peerAPIHandler
rr *httptest.ResponseRecorder
logBuf tstest.MemLogger
}
type check func(*testing.T, *peerAPITestEnv)
func checks(vv ...check) []check { return vv }
func httpStatus(wantStatus int) check {
return func(t *testing.T, e *peerAPITestEnv) {
if res := e.rr.Result(); res.StatusCode != wantStatus {
t.Errorf("HTTP response code = %v; want %v", res.Status, wantStatus)
}
}
}
func bodyContains(sub string) check {
return func(t *testing.T, e *peerAPITestEnv) {
if body := e.rr.Body.String(); !strings.Contains(body, sub) {
t.Errorf("HTTP response body does not contain %q; got: %s", sub, body)
}
}
}
func bodyNotContains(sub string) check {
return func(t *testing.T, e *peerAPITestEnv) {
if body := e.rr.Body.String(); strings.Contains(body, sub) {
t.Errorf("HTTP response body unexpectedly contains %q; got: %s", sub, body)
}
}
}
func fileHasSize(name string, size int) check {
return func(t *testing.T, e *peerAPITestEnv) {
root := e.ph.ps.taildrop.Dir()
if root == "" {
t.Errorf("no rootdir; can't check whether %q has size %v", name, size)
return
}
path := filepath.Join(root, name)
if fi, err := os.Stat(path); err != nil {
t.Errorf("fileHasSize(%q, %v): %v", name, size, err)
} else if fi.Size() != int64(size) {
t.Errorf("file %q has size %v; want %v", name, fi.Size(), size)
}
}
}
func fileHasContents(name string, want string) check {
return func(t *testing.T, e *peerAPITestEnv) {
root := e.ph.ps.taildrop.Dir()
if root == "" {
t.Errorf("no rootdir; can't check contents of %q", name)
return
}
path := filepath.Join(root, name)
got, err := os.ReadFile(path)
if err != nil {
t.Errorf("fileHasContents: %v", err)
return
}
if string(got) != want {
t.Errorf("file contents = %q; want %q", got, want)
}
}
}
func hexAll(v string) string {
var sb strings.Builder
for i := range len(v) {
fmt.Fprintf(&sb, "%%%02x", v[i])
}
return sb.String()
}
func TestHandlePeerAPI(t *testing.T) {
tests := []struct {
name string
isSelf bool // the peer sending the request is owned by us
capSharing bool // self node has file sharing capability
debugCap bool // self node has debug capability
omitRoot bool // don't configure
reqs []*http.Request
checks []check
}{
{
name: "not_peer_api",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("GET", "/", nil)},
checks: checks(
httpStatus(200),
bodyContains("This is my Tailscale device."),
bodyContains("You are the owner of this node."),
),
},
{
name: "not_peer_api_not_owner",
isSelf: false,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("GET", "/", nil)},
checks: checks(
httpStatus(200),
bodyContains("This is my Tailscale device."),
bodyNotContains("You are the owner of this node."),
),
},
{
name: "goroutines/deny-self-no-cap",
isSelf: true,
debugCap: false,
reqs: []*http.Request{httptest.NewRequest("GET", "/v0/goroutines", nil)},
checks: checks(httpStatus(403)),
},
{
name: "goroutines/deny-nonself",
isSelf: false,
debugCap: true,
reqs: []*http.Request{httptest.NewRequest("GET", "/v0/goroutines", nil)},
checks: checks(httpStatus(403)),
},
{
name: "goroutines/accept-self",
isSelf: true,
debugCap: true,
reqs: []*http.Request{httptest.NewRequest("GET", "/v0/goroutines", nil)},
checks: checks(
httpStatus(200),
bodyContains("ServeHTTP"),
),
},
{
name: "reject_non_owner_put",
isSelf: false,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/foo", nil)},
checks: checks(
httpStatus(http.StatusForbidden),
bodyContains("Taildrop disabled"),
),
},
{
name: "owner_without_cap",
isSelf: true,
capSharing: false,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/foo", nil)},
checks: checks(
httpStatus(http.StatusForbidden),
bodyContains("Taildrop disabled"),
),
},
{
name: "owner_with_cap_no_rootdir",
omitRoot: true,
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/foo", nil)},
checks: checks(
httpStatus(http.StatusForbidden),
bodyContains("Taildrop disabled; no storage directory"),
),
},
{
name: "bad_method",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("POST", "/v0/put/foo", nil)},
checks: checks(
httpStatus(405),
bodyContains("expected method GET or PUT"),
),
},
{
name: "put_zero_length",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/foo", nil)},
checks: checks(
httpStatus(200),
bodyContains("{}"),
fileHasSize("foo", 0),
fileHasContents("foo", ""),
),
},
{
name: "put_non_zero_length_content_length",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/foo", strings.NewReader("contents"))},
checks: checks(
httpStatus(200),
bodyContains("{}"),
fileHasSize("foo", len("contents")),
fileHasContents("foo", "contents"),
),
},
{
name: "put_non_zero_length_chunked",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/foo", struct{ io.Reader }{strings.NewReader("contents")})},
checks: checks(
httpStatus(200),
bodyContains("{}"),
fileHasSize("foo", len("contents")),
fileHasContents("foo", "contents"),
),
},
{
name: "bad_filename_partial",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/foo.partial", nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "bad_filename_deleted",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/foo.deleted", nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "bad_filename_dot",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/.", nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "bad_filename_empty",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/", nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "bad_filename_slash",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/foo/bar", nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "bad_filename_encoded_dot",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/"+hexAll("."), nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "bad_filename_encoded_slash",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/"+hexAll("/"), nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "bad_filename_encoded_backslash",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/"+hexAll("\\"), nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "bad_filename_encoded_dotdot",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/"+hexAll(".."), nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "bad_filename_encoded_dotdot_out",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/"+hexAll("foo/../../../../../etc/passwd"), nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "put_spaces_and_caps",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/"+hexAll("Foo Bar.dat"), strings.NewReader("baz"))},
checks: checks(
httpStatus(200),
bodyContains("{}"),
fileHasContents("Foo Bar.dat", "baz"),
),
},
{
name: "put_unicode",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/"+hexAll("Томас и его друзья.mp3"), strings.NewReader("главный озорник"))},
checks: checks(
httpStatus(200),
bodyContains("{}"),
fileHasContents("Томас и его друзья.mp3", "главный озорник"),
),
},
{
name: "put_invalid_utf8",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/"+(hexAll("😜")[:3]), nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "put_invalid_null",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/%00", nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "put_invalid_non_printable",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/%01", nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "put_invalid_colon",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/"+hexAll("nul:"), nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "put_invalid_surrounding_whitespace",
isSelf: true,
capSharing: true,
reqs: []*http.Request{httptest.NewRequest("PUT", "/v0/put/"+hexAll(" foo "), nil)},
checks: checks(
httpStatus(400),
bodyContains("invalid filename"),
),
},
{
name: "host-val/bad-ip",
isSelf: true,
debugCap: true,
reqs: []*http.Request{httptest.NewRequest("GET", "http://12.23.45.66:1234/v0/env", nil)},
checks: checks(
httpStatus(403),
),
},
{
name: "host-val/no-port",
isSelf: true,
debugCap: true,
reqs: []*http.Request{httptest.NewRequest("GET", "http://100.100.100.101/v0/env", nil)},
checks: checks(
httpStatus(403),
),
},
{
name: "host-val/peer",
isSelf: true,
debugCap: true,
reqs: []*http.Request{httptest.NewRequest("GET", "http://peer/v0/env", nil)},
checks: checks(
httpStatus(200),
),
},
{
name: "duplicate_zero_length",
isSelf: true,
capSharing: true,
reqs: []*http.Request{
httptest.NewRequest("PUT", "/v0/put/foo", nil),
httptest.NewRequest("PUT", "/v0/put/foo", nil),
},
checks: checks(
httpStatus(200),
func(t *testing.T, env *peerAPITestEnv) {
got, err := env.ph.ps.taildrop.WaitingFiles()
if err != nil {
t.Fatalf("WaitingFiles error: %v", err)
}
want := []apitype.WaitingFile{{Name: "foo", Size: 0}}
if diff := cmp.Diff(got, want); diff != "" {
t.Fatalf("WaitingFile mismatch (-got +want):\n%s", diff)
}
},
),
},
{
name: "duplicate_non_zero_length_content_length",
isSelf: true,
capSharing: true,
reqs: []*http.Request{
httptest.NewRequest("PUT", "/v0/put/foo", strings.NewReader("contents")),
httptest.NewRequest("PUT", "/v0/put/foo", strings.NewReader("contents")),
},
checks: checks(
httpStatus(200),
func(t *testing.T, env *peerAPITestEnv) {
got, err := env.ph.ps.taildrop.WaitingFiles()
if err != nil {
t.Fatalf("WaitingFiles error: %v", err)
}
want := []apitype.WaitingFile{{Name: "foo", Size: 8}}
if diff := cmp.Diff(got, want); diff != "" {
t.Fatalf("WaitingFile mismatch (-got +want):\n%s", diff)
}
},
),
},
{
name: "duplicate_different_files",
isSelf: true,
capSharing: true,
reqs: []*http.Request{
httptest.NewRequest("PUT", "/v0/put/foo", strings.NewReader("fizz")),
httptest.NewRequest("PUT", "/v0/put/foo", strings.NewReader("buzz")),
},
checks: checks(
httpStatus(200),
func(t *testing.T, env *peerAPITestEnv) {
got, err := env.ph.ps.taildrop.WaitingFiles()
if err != nil {
t.Fatalf("WaitingFiles error: %v", err)
}
want := []apitype.WaitingFile{{Name: "foo", Size: 4}, {Name: "foo (1)", Size: 4}}
if diff := cmp.Diff(got, want); diff != "" {
t.Fatalf("WaitingFile mismatch (-got +want):\n%s", diff)
}
},
),
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
selfNode := &tailcfg.Node{
Addresses: []netip.Prefix{
netip.MustParsePrefix("100.100.100.101/32"),
},
}
if tt.debugCap {
selfNode.CapMap = tailcfg.NodeCapMap{tailcfg.CapabilityDebug: nil}
}
var e peerAPITestEnv
lb := &LocalBackend{
logf: e.logBuf.Logf,
capFileSharing: tt.capSharing,
netMap: &netmap.NetworkMap{SelfNode: selfNode.View()},
clock: &tstest.Clock{},
}
e.ph = &peerAPIHandler{
isSelf: tt.isSelf,
selfNode: selfNode.View(),
peerNode: (&tailcfg.Node{
ComputedName: "some-peer-name",
}).View(),
ps: &peerAPIServer{
b: lb,
},
}
var rootDir string
if !tt.omitRoot {
rootDir = t.TempDir()
if e.ph.ps.taildrop == nil {
e.ph.ps.taildrop = taildrop.ManagerOptions{
Logf: e.logBuf.Logf,
Dir: rootDir,
}.New()
}
}
for _, req := range tt.reqs {
e.rr = httptest.NewRecorder()
if req.Host == "example.com" {
req.Host = "100.100.100.101:12345"
}
e.ph.ServeHTTP(e.rr, req)
}
for _, f := range tt.checks {
f(t, &e)
}
if t.Failed() && rootDir != "" {
t.Logf("Contents of %s:", rootDir)
des, _ := fs.ReadDir(os.DirFS(rootDir), ".")
for _, de := range des {
fi, err := de.Info()
if err != nil {
t.Log(err)
} else {
t.Logf(" %v %5d %s", fi.Mode(), fi.Size(), de.Name())
}
}
}
})
}
}
// Windows likes to hold on to file descriptors for some indeterminate
// amount of time after you close them and not let you delete them for
// a bit. So test that we work around that sufficiently.
func TestFileDeleteRace(t *testing.T) {
dir := t.TempDir()
ps := &peerAPIServer{
b: &LocalBackend{
logf: t.Logf,
capFileSharing: true,
clock: &tstest.Clock{},
},
taildrop: taildrop.ManagerOptions{
Logf: t.Logf,
Dir: dir,
}.New(),
}
ph := &peerAPIHandler{
isSelf: true,
peerNode: (&tailcfg.Node{
ComputedName: "some-peer-name",
}).View(),
selfNode: (&tailcfg.Node{
Addresses: []netip.Prefix{netip.MustParsePrefix("100.100.100.101/32")},
}).View(),
ps: ps,
}
buf := make([]byte, 2<<20)
for range 30 {
rr := httptest.NewRecorder()
ph.ServeHTTP(rr, httptest.NewRequest("PUT", "http://100.100.100.101:123/v0/put/foo.txt", bytes.NewReader(buf[:rand.Intn(len(buf))])))
if res := rr.Result(); res.StatusCode != 200 {
t.Fatal(res.Status)
}
wfs, err := ps.taildrop.WaitingFiles()
if err != nil {
t.Fatal(err)
}
if len(wfs) != 1 {
t.Fatalf("waiting files = %d; want 1", len(wfs))
}
if err := ps.taildrop.DeleteFile("foo.txt"); err != nil {
t.Fatal(err)
}
wfs, err = ps.taildrop.WaitingFiles()
if err != nil {
t.Fatal(err)
}
if len(wfs) != 0 {
t.Fatalf("waiting files = %d; want 0", len(wfs))
}
}
}
func TestPeerAPIReplyToDNSQueries(t *testing.T) {
var h peerAPIHandler
h.isSelf = true
if !h.replyToDNSQueries() {
t.Errorf("for isSelf = false; want true")
}
h.isSelf = false
h.remoteAddr = netip.MustParseAddrPort("100.150.151.152:12345")
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(),
},
}
if h.ps.b.OfferingExitNode() {
t.Fatal("unexpectedly offering exit node")
}
h.ps.b.pm.SetPrefs((&ipn.Prefs{
AdvertiseRoutes: []netip.Prefix{
netip.MustParsePrefix("0.0.0.0/0"),
netip.MustParsePrefix("::/0"),
},
}).View(), ipn.NetworkProfile{})
if !h.ps.b.OfferingExitNode() {
t.Fatal("unexpectedly not offering exit node")
}
if h.replyToDNSQueries() {
t.Errorf("unexpectedly doing DNS without filter")
}
h.ps.b.setFilter(filter.NewAllowNone(logger.Discard, new(netipx.IPSet)))
if h.replyToDNSQueries() {
t.Errorf("unexpectedly doing DNS without filter")
}
f := filter.NewAllowAllForTest(logger.Discard)
h.ps.b.setFilter(f)
if !h.replyToDNSQueries() {
t.Errorf("unexpectedly deny; wanted to be a DNS server")
}
// Also test IPv6.
h.remoteAddr = netip.MustParseAddrPort("[fe70::1]:12345")
if !h.replyToDNSQueries() {
t.Errorf("unexpectedly IPv6 deny; wanted to be a DNS server")
}
}
func TestPeerAPIPrettyReplyCNAME(t *testing.T) {
var h peerAPIHandler
h.remoteAddr = netip.MustParseAddrPort("100.150.151.152:12345")
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(),
// configure as an app connector just to enable the API.
appConnector: appc.NewAppConnector(t.Logf, &appctest.RouteCollector{}),
},
}
h.ps.resolver = &fakeResolver{build: func(b *dnsmessage.Builder) {
b.CNAMEResource(
dnsmessage.ResourceHeader{
Name: dnsmessage.MustNewName("www.example.com."),
Type: dnsmessage.TypeCNAME,
Class: dnsmessage.ClassINET,
TTL: 0,
},
dnsmessage.CNAMEResource{
CNAME: dnsmessage.MustNewName("example.com."),
},
)
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},
},
)
}}
f := filter.NewAllowAllForTest(logger.Discard)
h.ps.b.setFilter(f)
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=www.example.com.", nil))
if w.Code != http.StatusOK {
t.Errorf("unexpected status code: %v", w.Code)
}
var addrs []string
json.NewDecoder(w.Body).Decode(&addrs)
if len(addrs) == 0 {
t.Fatalf("no addresses returned")
}
for _, addr := range addrs {
netip.MustParseAddr(addr)
}
}
func TestPeerAPIReplyToDNSQueriesAreObserved(t *testing.T) {
ctx := context.Background()
var h peerAPIHandler
h.remoteAddr = netip.MustParseAddrPort("100.150.151.152:12345")
rc := &appctest.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.NewAppConnector(t.Logf, rc),
},
}
h.ps.b.appConnector.UpdateDomains([]string{"example.com"})
h.ps.b.appConnector.Wait(ctx)
h.ps.resolver = &fakeResolver{build: func(b *dnsmessage.Builder) {
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},
},
)
}}
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=example.com.", nil))
if w.Code != http.StatusOK {
t.Errorf("unexpected status code: %v", w.Code)
}
h.ps.b.appConnector.Wait(ctx)
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)
}
}
func TestPeerAPIReplyToDNSQueriesAreObservedWithCNAMEFlattening(t *testing.T) {
ctx := context.Background()
var h peerAPIHandler
h.remoteAddr = netip.MustParseAddrPort("100.150.151.152:12345")
rc := &appctest.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.NewAppConnector(t.Logf, rc),
},
}
h.ps.b.appConnector.UpdateDomains([]string{"www.example.com"})
h.ps.b.appConnector.Wait(ctx)
h.ps.resolver = &fakeResolver{build: func(b *dnsmessage.Builder) {
b.CNAMEResource(
dnsmessage.ResourceHeader{
Name: dnsmessage.MustNewName("www.example.com."),
Type: dnsmessage.TypeCNAME,
Class: dnsmessage.ClassINET,
TTL: 0,
},
dnsmessage.CNAMEResource{
CNAME: dnsmessage.MustNewName("example.com."),
},
)
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},
},
)
}}
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=www.example.com.", nil))
if w.Code != http.StatusOK {
t.Errorf("unexpected status code: %v", w.Code)
}
h.ps.b.appConnector.Wait(ctx)
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 {
build func(*dnsmessage.Builder)
}
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()
f.build(&b)
return b.Finish()
}