如何将代理与 TcpClient.ConnectAsync() 一起使用? [英] How to use Proxy with TcpClient.ConnectAsync()?

问题描述

.NET 中的 HTTP 代理支持实际上并不支持较低级别的类，如 TcpClient 或 Socket.但我想通过支持CONNECT"命令的 HTTP 代理连接 TCPServer(ip、端口).

HTTP proxy support in .NET does not actually support the lower level classes like TcpClient or Socket. But I want to connect a TCPServer (ip, port) through HTTP proxy that support 'CONNECT' command.

所以我需要做以下步骤:

So I need to do the following steps:

1. 连接到代理.
2. 发送CONNECT Host:Port HTTP/1.1
3. 发送
4. 等待一行响应.如果包含HTTP/1.X 200，则连接成功.
5. 阅读更多响应行，直到收到空行.
6. 它通过代理连接到外部世界.可能与代理进行的任何数据交换.

实际上我是在没有代理的情况下这样做的

Actually I do this without proxy

    TcpClient _client;
    NetworkStream _stream;

    public static async Task<bool> ConnectAsync(string hostname, int port)
    {
        _client = new TcpClient();
        await _client.ConnectAsync(hostname, port).ConfigureAwait(false);
        _stream = conn._client.GetStream();

        ..... Do some stuff

        // Connexion OK
        return true;
    }

如何在连接 TcpClient 之前使用代理和凭据?

How can use proxy and credentials before connecting TcpClient?

推荐答案

我找到了一个基于 .NET:通过带有身份验证的 HTTP 代理连接 TcpClient 和 使用TcpClient绕过代理

I find a solution base on .NET: Connecting a TcpClient through an HTTP proxy with authentication and Bypass the proxy using TcpClient

TcpClient _client;
NetworkStream _stream;

public TcpClient ProxyTcpClient(string targetHost, int targetPort, string httpProxyHost, int httpProxyPort, string proxyUserName, string proxyPassword)
{
        const BindingFlags Flags = BindingFlags.NonPublic | BindingFlags.Instance;
        Uri proxyUri = new UriBuilder
        {
            Scheme = Uri.UriSchemeHttp,
            Host = httpProxyHost,
            Port = httpProxyPort
        }.Uri;
        Uri targetUri = new UriBuilder
        {
             Scheme = Uri.UriSchemeHttp,
             Host = targetHost,
             Port = targetPort
        }.Uri;

        WebProxy webProxy = new WebProxy(proxyUri, true);
        webProxy.Credentials = new NetworkCredential(proxyUserName, proxyPassword);
        WebRequest request = WebRequest.Create(targetUri);
        request.Proxy = webProxy;
        request.Method = "CONNECT";
        HttpWebResponse response = (HttpWebResponse)request.GetResponse();
        Stream responseStream = response.GetResponseStream();
        Type responseType = responseStream.GetType();
        PropertyInfo connectionProperty = responseType.GetProperty("Connection", Flags);
        var connection = connectionProperty.GetValue(responseStream, null);
        Type connectionType = connection.GetType();
        PropertyInfo networkStreamProperty = connectionType.GetProperty("NetworkStream", Flags);
        NetworkStream networkStream = (NetworkStream)networkStreamProperty.GetValue(connection, null);
        Type nsType = networkStream.GetType();
        PropertyInfo socketProperty = nsType.GetProperty("Socket", Flags);
        Socket socket = (Socket)socketProperty.GetValue(networkStream, null);

        return new TcpClient { Client = socket };
}

public static async Task<bool> ConnectAsync(string hostname, int port)
{
        _client = ProxyTcpClient("IPTargetHost", 1234, "IPProxyHost", 5678, "Userproxy", "Userppwd");
        _stream = conn._client.GetStream();

        ..... Do some stuff

        // Connexion OK
        return true;
}

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