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// Copyright (c) Microsoft Corporation.
// Licensed under the MIT license.
package tunnels
import (
"context"
"crypto/tls"
"fmt"
"io"
"net"
"net/http"
"time"
"github.com/gorilla/websocket"
)
type socket struct {
addr string
protocols []string
headers http.Header
tlsConfig *tls.Config
conn *websocket.Conn
reader io.Reader
}
func newSocket(uri string, protocols []string, headers http.Header, tlsConfig *tls.Config) *socket {
return &socket{addr: uri, protocols: protocols, headers: headers, tlsConfig: tlsConfig}
}
func (s *socket) connect(ctx context.Context) error {
dialer := websocket.Dialer{
Proxy: http.ProxyFromEnvironment,
HandshakeTimeout: 45 * time.Second,
TLSClientConfig: s.tlsConfig,
Subprotocols: s.protocols,
}
ws, resp, err := dialer.Dial(s.addr, s.headers)
if err != nil {
if err == websocket.ErrBadHandshake {
return fmt.Errorf("handshake failed with status %d", resp.StatusCode)
}
return err
}
s.conn = ws
return nil
}
func (s *socket) Read(b []byte) (int, error) {
if s.reader == nil {
_, reader, err := s.conn.NextReader()
if err != nil {
return 0, err
}
s.reader = reader
}
bytesRead, err := s.reader.Read(b)
if err != nil {
s.reader = nil
if err == io.EOF {
err = nil
}
}
return bytesRead, err
}
func (s *socket) Write(b []byte) (int, error) {
nextWriter, err := s.conn.NextWriter(websocket.BinaryMessage)
if err != nil {
return 0, err
}
bytesWritten, err := nextWriter.Write(b)
nextWriter.Close()
return bytesWritten, err
}
func (s *socket) Close() error {
return s.conn.Close()
}
func (s *socket) LocalAddr() net.Addr {
return s.conn.LocalAddr()
}
func (s *socket) RemoteAddr() net.Addr {
return s.conn.RemoteAddr()
}
func (s *socket) SetDeadline(t time.Time) error {
if err := s.SetReadDeadline(t); err != nil {
return err
}
return s.SetWriteDeadline(t)
}
func (s *socket) SetReadDeadline(t time.Time) error {
return s.conn.SetReadDeadline(t)
}
func (s *socket) SetWriteDeadline(t time.Time) error {
return s.conn.SetWriteDeadline(t)
}
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