cloudflared-mirror/ingress/origin_connection_test.go

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package ingress
import (
"bytes"
"context"
"fmt"
"io"
"net"
"net/http"
"net/http/httptest"
"net/url"
"testing"
"time"
"github.com/gobwas/ws/wsutil"
gorillaWS "github.com/gorilla/websocket"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"golang.org/x/net/proxy"
"golang.org/x/sync/errgroup"
"github.com/cloudflare/cloudflared/socks"
"github.com/cloudflare/cloudflared/stream"
"github.com/cloudflare/cloudflared/websocket"
)
const (
testStreamTimeout = time.Second * 3
echoHeaderName = "Test-Cloudflared-Echo"
)
var (
testMessage = []byte("TestStreamOriginConnection")
testResponse = []byte(fmt.Sprintf("echo-%s", testMessage))
)
func TestStreamTCPConnection(t *testing.T) {
cfdConn, originConn := net.Pipe()
tcpConn := tcpConnection{
Conn: cfdConn,
writeTimeout: 30 * time.Second,
}
eyeballConn, edgeConn := net.Pipe()
ctx, cancel := context.WithTimeout(context.Background(), testStreamTimeout)
defer cancel()
errGroup, ctx := errgroup.WithContext(ctx)
errGroup.Go(func() error {
_, err := eyeballConn.Write(testMessage)
require.NoError(t, err)
readBuffer := make([]byte, len(testResponse))
_, err = eyeballConn.Read(readBuffer)
require.NoError(t, err)
require.Equal(t, testResponse, readBuffer)
return nil
})
errGroup.Go(func() error {
echoTCPOrigin(t, originConn)
originConn.Close()
return nil
})
tcpConn.Stream(ctx, edgeConn, TestLogger)
require.NoError(t, errGroup.Wait())
}
func TestDefaultStreamWSOverTCPConnection(t *testing.T) {
cfdConn, originConn := net.Pipe()
tcpOverWSConn := tcpOverWSConnection{
conn: cfdConn,
streamHandler: DefaultStreamHandler,
}
eyeballConn, edgeConn := net.Pipe()
ctx, cancel := context.WithTimeout(context.Background(), testStreamTimeout)
defer cancel()
errGroup, ctx := errgroup.WithContext(ctx)
errGroup.Go(func() error {
echoWSEyeball(t, eyeballConn)
return nil
})
errGroup.Go(func() error {
echoTCPOrigin(t, originConn)
originConn.Close()
return nil
})
tcpOverWSConn.Stream(ctx, edgeConn, TestLogger)
require.NoError(t, errGroup.Wait())
}
// TestSocksStreamWSOverTCPConnection simulates proxying in socks mode.
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// Eyeball side runs cloudflared access tcp with --url flag to start a websocket forwarder which
// wraps SOCKS5 traffic in websocket
// Origin side runs a tcpOverWSConnection with socks.StreamHandler
func TestSocksStreamWSOverTCPConnection(t *testing.T) {
var (
sendMessage = t.Name()
echoHeaderIncomingValue = fmt.Sprintf("header-%s", sendMessage)
echoMessage = fmt.Sprintf("echo-%s", sendMessage)
echoHeaderReturnValue = fmt.Sprintf("echo-%s", echoHeaderIncomingValue)
)
statusCodes := []int{
http.StatusOK,
http.StatusTemporaryRedirect,
http.StatusBadRequest,
http.StatusInternalServerError,
}
for _, status := range statusCodes {
handler := func(w http.ResponseWriter, r *http.Request) {
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body, err := io.ReadAll(r.Body)
require.NoError(t, err)
require.Equal(t, []byte(sendMessage), body)
require.Equal(t, echoHeaderIncomingValue, r.Header.Get(echoHeaderName))
w.Header().Set(echoHeaderName, echoHeaderReturnValue)
w.WriteHeader(status)
w.Write([]byte(echoMessage))
}
origin := httptest.NewServer(http.HandlerFunc(handler))
defer origin.Close()
originURL, err := url.Parse(origin.URL)
require.NoError(t, err)
originConn, err := net.Dial("tcp", originURL.Host)
require.NoError(t, err)
tcpOverWSConn := tcpOverWSConnection{
conn: originConn,
streamHandler: socks.StreamHandler,
}
wsForwarderOutConn, edgeConn := net.Pipe()
ctx, cancel := context.WithTimeout(context.Background(), testStreamTimeout)
defer cancel()
errGroup, ctx := errgroup.WithContext(ctx)
errGroup.Go(func() error {
tcpOverWSConn.Stream(ctx, edgeConn, TestLogger)
return nil
})
wsForwarderListener, err := net.Listen("tcp", "127.0.0.1:0")
require.NoError(t, err)
errGroup.Go(func() error {
wsForwarderInConn, err := wsForwarderListener.Accept()
require.NoError(t, err)
defer wsForwarderInConn.Close()
stream.Pipe(wsForwarderInConn, &wsEyeball{wsForwarderOutConn}, TestLogger)
return nil
})
eyeballDialer, err := proxy.SOCKS5("tcp", wsForwarderListener.Addr().String(), nil, proxy.Direct)
require.NoError(t, err)
transport := &http.Transport{
Dial: eyeballDialer.Dial,
}
// Request URL doesn't matter because the transport is using eyeballDialer to connectq
req, err := http.NewRequestWithContext(ctx, "GET", "http://test-socks-stream.com", bytes.NewBuffer([]byte(sendMessage)))
assert.NoError(t, err)
req.Header.Set(echoHeaderName, echoHeaderIncomingValue)
resp, err := transport.RoundTrip(req)
assert.NoError(t, err)
assert.Equal(t, status, resp.StatusCode)
require.Equal(t, echoHeaderReturnValue, resp.Header.Get(echoHeaderName))
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body, err := io.ReadAll(resp.Body)
require.NoError(t, err)
require.Equal(t, []byte(echoMessage), body)
wsForwarderOutConn.Close()
edgeConn.Close()
tcpOverWSConn.Close()
require.NoError(t, errGroup.Wait())
}
}
func TestWsConnReturnsBeforeStreamReturns(t *testing.T) {
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
eyeballConn := &readWriter{
w: w,
r: r.Body,
}
cfdConn, originConn := net.Pipe()
tcpOverWSConn := tcpOverWSConnection{
conn: cfdConn,
streamHandler: DefaultStreamHandler,
}
go func() {
time.Sleep(time.Millisecond * 10)
// Simulate losing connection to origin
originConn.Close()
}()
ctx := context.WithValue(r.Context(), websocket.PingPeriodContextKey, time.Microsecond)
tcpOverWSConn.Stream(ctx, eyeballConn, TestLogger)
})
server := httptest.NewServer(handler)
defer server.Close()
client := server.Client()
ctx, cancel := context.WithTimeout(context.Background(), time.Second*10)
defer cancel()
errGroup, ctx := errgroup.WithContext(ctx)
for i := 0; i < 50; i++ {
eyeballConn, edgeConn := net.Pipe()
req, err := http.NewRequestWithContext(ctx, http.MethodConnect, server.URL, edgeConn)
assert.NoError(t, err)
resp, err := client.Transport.RoundTrip(req)
assert.NoError(t, err)
assert.Equal(t, resp.StatusCode, http.StatusOK)
errGroup.Go(func() error {
for {
if err := wsutil.WriteClientBinary(eyeballConn, testMessage); err != nil {
return nil
}
}
})
}
assert.NoError(t, errGroup.Wait())
}
type wsEyeball struct {
conn net.Conn
}
func (wse *wsEyeball) Read(p []byte) (int, error) {
data, err := wsutil.ReadServerBinary(wse.conn)
if err != nil {
return 0, err
}
return copy(p, data), nil
}
func (wse *wsEyeball) Write(p []byte) (int, error) {
err := wsutil.WriteClientBinary(wse.conn, p)
return len(p), err
}
func echoWSEyeball(t *testing.T, conn net.Conn) {
defer func() {
assert.NoError(t, conn.Close())
}()
if !assert.NoError(t, wsutil.WriteClientBinary(conn, testMessage)) {
return
}
readMsg, err := wsutil.ReadServerBinary(conn)
if !assert.NoError(t, err) {
return
}
assert.Equal(t, testResponse, readMsg)
}
func echoWSOrigin(t *testing.T, expectMessages bool) *httptest.Server {
var upgrader = gorillaWS.Upgrader{
ReadBufferSize: 10,
WriteBufferSize: 10,
}
ws := func(w http.ResponseWriter, r *http.Request) {
header := make(http.Header)
for k, vs := range r.Header {
if k == "Test-Cloudflared-Echo" {
header[k] = vs
}
}
conn, err := upgrader.Upgrade(w, r, header)
require.NoError(t, err)
defer conn.Close()
sawMessage := false
for {
messageType, p, err := conn.ReadMessage()
if err != nil {
if expectMessages && !sawMessage {
t.Errorf("unexpected error: %v", err)
}
return
}
assert.Equal(t, testMessage, p)
sawMessage = true
if err := conn.WriteMessage(messageType, testResponse); err != nil {
return
}
}
}
// NewTLSServer starts the server in another thread
return httptest.NewTLSServer(http.HandlerFunc(ws))
}
func echoTCPOrigin(t *testing.T, conn net.Conn) {
readBuffer := make([]byte, len(testMessage))
_, err := conn.Read(readBuffer)
assert.NoError(t, err)
assert.Equal(t, testMessage, readBuffer)
_, err = conn.Write(testResponse)
assert.NoError(t, err)
}
type readWriter struct {
w io.Writer
r io.Reader
}
func (r *readWriter) Read(p []byte) (n int, err error) {
return r.r.Read(p)
}
func (r *readWriter) Write(p []byte) (n int, err error) {
return r.w.Write(p)
}