Question

我正在尝试使用SslStream连接到网站来传递请求，但我收到以下IOException：

无法从传输连接中读取数据：连接尝试失败，因为连接方在一段时间后没有正确响应，或者由于连接的主机无法响应而建立的连接失败。

为了更有效地进行测试，我创建了一个独立程序并从此处复制了客户端代码示例代码：http://msdn.microsoft.com/en-us/library/system.net.security.sslstream(v=vs.110).aspx，然后根据另一方的API传递请求。

            string Request = "The Request";
            TcpClient client = new TcpClient();
            client.ReceiveTimeout = 10000; //10 seconds
            SslStream sslStream;
            string server = "ssl.website.com";
            client.Connect(server, 12345);
            sslStream = new SslStream(client.GetStream(), false, new RemoteCertificateValidationCallback(ValidateServerCertificate), null );

            sslStream.AuthenticateAsClient(server,null, SslProtocols.Tls12, false);

            StringBuilder messageData = new StringBuilder();
            byte[] len = BitConverter.GetBytes(SslClient.GetLen(Request));

            messageData.AppendLine("Writing length of data " + SslClient.GetLen(Request).ToString());
            sslStream.Write(len);
            byte[] msg = Encoding.UTF8.GetBytes(Request);

            sslStream.Write(msg);
            sslStream.Flush();

            byte[] buffer = new byte[2048];

            messageData.AppendLine("Writing data " + System.Text.Encoding.UTF8.GetString(msg));
            messageData.AppendLine("Is Authenticated? " + sslStream.IsAuthenticated.ToString());
            int bytes = -1;

            try
            {
                do
                {
                    bytes = sslStream.Read(buffer, 0, buffer.Length);

                    Decoder decoder = Encoding.UTF8.GetDecoder();
                    char[] chars = new char[decoder.GetCharCount(buffer, 0, bytes)];
                    decoder.GetChars(buffer, 0, bytes, chars, 0);
                    messageData.AppendLine(chars.ToString());

                    if (messageData.ToString().IndexOf("<EOF>") != -1)
                    {
                        break;
                    }

                } while (bytes != 0);
            }
            catch(Exception ex)
            {
                messageData.AppendLine(ex.Message);
            }

            return messageData.ToString();
        }


        public static bool ValidateServerCertificate(
              object sender,
              X509Certificate certificate,
              X509Chain chain,
              SslPolicyErrors sslPolicyErrors)
        {
            if (sslPolicyErrors == SslPolicyErrors.None)
                return true;
            return false;
        }

        public static Int16 GetLen(string Request)
        {
            return Convert.ToInt16(Encoding.UTF8.GetBytes(Request).Length);

        }

它失败的部分是sslStream.Read（buffer，0，buffer.Length）。这永远不会返回，也是IOException的来源。

我正在尝试连接的人说SSL握手失败，但我没有看到任何迹象。它总是使它成为sslStread.Read然后失败。他们有时说他们收到请求并发送回复，但我还没有看到回复。

由于

Answer 1

在与合作伙伴进行一些测试后，结果证明这是我代码中的一个简单错误。必须将长度字节翻转为网络字节顺序。我是使用IPAddress.HostToNetworkOrder

完成的

            byte[] len = BitConverter.GetBytes(IPAddress.HostToNetworkOrder(SslClient.GetLen(Request)));

            messageData.AppendLine("Writing length of data " + SslClient.GetLen(Request).ToString());
            sslStream.Write(len);

SslStream.Read导致IOException

1 个答案: