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// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.
package tunnelssh
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"net"
"testing"
"time"
"github.com/microsoft/dev-tunnels/go/tunnels/ssh/messages"
)
type mockChannelOpener struct {
openChannelFunc func(string, string, int, string, int) (io.ReadWriteCloser, error)
}
func (m *mockChannelOpener) openChannel(
channelType string,
originIP string,
originPort int,
host string,
port int,
) (io.ReadWriteCloser, error) {
return m.openChannelFunc(channelType, originIP, originPort, host, port)
}
type mockChannel struct {
*bytes.Buffer
}
func (m *mockChannel) Close() error {
return nil
}
func TestLocalPortForwarderPortForwardChannelType(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
streamData := "stream-data"
host := "127.0.0.1"
port := 8080
stream := &mockChannel{bytes.NewBufferString(streamData)}
co := &mockChannelOpener{
openChannelFunc: func(channelType, originIP string, originPort int, host string, port int) (io.ReadWriteCloser, error) {
if channelType != messages.PortForwardChannelType {
return nil, fmt.Errorf("expected channel type %s, got %s", messages.PortForwardChannelType, channelType)
}
return stream, nil
},
}
lpf := newLocalPortForwarder(co, messages.PortForwardChannelType, host, port)
done := make(chan error, 2)
go func() {
done <- lpf.startForwarding(ctx)
}()
go func() {
var conn net.Conn
// We retry DialTimeout in a loop to deal with a race in forwarder startup.
for tries := 0; conn == nil && tries < 2; tries++ {
conn, _ = net.DialTimeout("tcp", fmt.Sprintf(":%d", port), 2*time.Second)
if conn == nil {
time.Sleep(1 * time.Second)
}
}
if conn == nil {
done <- errors.New("failed to connect to forwarded port")
return
}
b := make([]byte, len(streamData))
if _, err := conn.Read(b); err != nil && err != io.EOF {
done <- fmt.Errorf("reading stream: %w", err)
return
}
if string(b) != streamData {
done <- fmt.Errorf("stream data is not expected value, got: %s", string(b))
return
}
if _, err := conn.Write([]byte("new-data")); err != nil {
done <- fmt.Errorf("writing to stream: %w", err)
return
}
done <- nil
}()
select {
case err := <-done:
if err != nil {
t.Errorf("Unexpected error: %v", err)
}
}
}
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