| 55 | } |
| 56 | |
| 57 | func doHTTPConnectHandshake(ctx context.Context, conn net.Conn, grpcUA string, opts proxyattributes.Options) (_ net.Conn, err error) { |
| 58 | defer func() { |
| 59 | if err != nil { |
| 60 | conn.Close() |
| 61 | } |
| 62 | }() |
| 63 | |
| 64 | req := &http.Request{ |
| 65 | Method: http.MethodConnect, |
| 66 | URL: &url.URL{Host: opts.ConnectAddr}, |
| 67 | Header: map[string][]string{"User-Agent": {grpcUA}}, |
| 68 | } |
| 69 | if user := opts.User; user != nil { |
| 70 | u := user.Username() |
| 71 | p, _ := user.Password() |
| 72 | req.Header.Add(proxyAuthHeaderKey, "Basic "+basicAuth(u, p)) |
| 73 | } |
| 74 | if err := sendHTTPRequest(ctx, req, conn); err != nil { |
| 75 | return nil, fmt.Errorf("failed to write the HTTP request: %v", err) |
| 76 | } |
| 77 | |
| 78 | r := bufio.NewReader(conn) |
| 79 | resp, err := http.ReadResponse(r, req) |
| 80 | if err != nil { |
| 81 | return nil, fmt.Errorf("reading server HTTP response: %v", err) |
| 82 | } |
| 83 | defer resp.Body.Close() |
| 84 | if resp.StatusCode != http.StatusOK { |
| 85 | dump, err := httputil.DumpResponse(resp, true) |
| 86 | if err != nil { |
| 87 | return nil, fmt.Errorf("failed to do connect handshake, status code: %s", resp.Status) |
| 88 | } |
| 89 | return nil, fmt.Errorf("failed to do connect handshake, response: %q", dump) |
| 90 | } |
| 91 | // The buffer could contain extra bytes from the target server, so we can't |
| 92 | // discard it. However, in many cases where the server waits for the client |
| 93 | // to send the first message (e.g. when TLS is being used), the buffer will |
| 94 | // be empty, so we can avoid the overhead of reading through this buffer. |
| 95 | if r.Buffered() != 0 { |
| 96 | return &bufConn{Conn: conn, r: r}, nil |
| 97 | } |
| 98 | return conn, nil |
| 99 | } |
| 100 | |
| 101 | // proxyDial establishes a TCP connection to the specified address and performs an HTTP CONNECT handshake. |
| 102 | func proxyDial(ctx context.Context, addr resolver.Address, grpcUA string, opts proxyattributes.Options) (net.Conn, error) { |