654 lines
22 KiB
C#
654 lines
22 KiB
C#
using System;
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using System.Buffers;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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using System.Net;
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using System.Net.Sockets;
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using System.Runtime.InteropServices;
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using System.Text;
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using System.Threading;
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using System.Threading.Tasks;
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class Program
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{
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static string USER = "user";
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static string PASS = "pass";
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static readonly string UPSTREAM_USER = Environment.GetEnvironmentVariable("UPSTREAM_USER");
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static readonly string UPSTREAM_PASS = Environment.GetEnvironmentVariable("UPSTREAM_PASS");
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static readonly bool UPSTREAM_ALLOW_EMPTY_PASSWORD = string.Equals(
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Environment.GetEnvironmentVariable("UPSTREAM_ALLOW_EMPTY_PASSWORD"),
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"1",
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StringComparison.OrdinalIgnoreCase);
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static readonly string UPSTREAM_PROXY_AUTH_HEADER = BuildUpstreamProxyAuthHeader();
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static long _connectionSeq;
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static async Task Main()
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{
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int port = 8888;
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RegisterGlobalExceptionHandlers();
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Log.Info("=== LOCAL PROXY ===");
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Log.Info($"http://127.0.0.1:{port}");
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Log.Info($"login: {USER}");
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Log.Info($"pass : {PASS}");
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var listener = new TcpListener(IPAddress.Any, port);
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listener.Start();
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Log.Info($"Listening on {listener.LocalEndpoint}");
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while (true)
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{
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try
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{
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var client = await listener.AcceptTcpClientAsync();
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var connectionId = Interlocked.Increment(ref _connectionSeq);
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Log.Info($"[conn:{connectionId}] accepted from {client.Client.RemoteEndPoint}");
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_ = Task.Run(() => HandleClient(client, connectionId));
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}
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catch (Exception ex)
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{
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Log.Error("AcceptTcpClientAsync failed", ex);
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}
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}
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}
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static void RegisterGlobalExceptionHandlers()
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{
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AppDomain.CurrentDomain.UnhandledException += (_, args) =>
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Log.Error("Unhandled exception", args.ExceptionObject as Exception);
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TaskScheduler.UnobservedTaskException += (_, args) =>
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{
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Log.Error("Unobserved task exception", args.Exception);
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args.SetObserved();
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};
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}
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static async Task HandleClient(TcpClient client, long connectionId)
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{
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using (client)
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{
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try
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{
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var stream = client.GetStream();
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var request = await ReadHeaders(stream, $"conn:{connectionId} client-request");
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if (request == null)
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{
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Log.Warn($"[conn:{connectionId}] empty or invalid request");
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return;
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}
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Log.Info($"[conn:{connectionId}] {request.Method} {request.Target}");
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if (!CheckAuth(request.Raw))
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{
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Log.Warn($"[conn:{connectionId}] proxy auth failed");
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await Write407(stream);
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return;
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}
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if (request.Method == "CONNECT")
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await HandleConnect(stream, request.Target, connectionId);
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else
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await HandleHttp(stream, request, connectionId);
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}
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catch (Exception ex)
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{
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Log.Error($"[conn:{connectionId}] client handling failed", ex);
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}
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finally
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{
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Log.Info($"[conn:{connectionId}] closed");
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}
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}
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}
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// ================= HTTP =================
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static async Task HandleHttp(NetworkStream clientStream, HttpRequest req, long connectionId)
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{
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var proxyUri = WinHttpHelper.GetProxyForUrl(new Uri(req.Url));
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if (proxyUri == null)
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{
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Log.Error($"[conn:{connectionId}] no upstream proxy for {req.Url}");
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await Write502(clientStream);
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return;
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}
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Log.Info($"[conn:{connectionId}] HTTP upstream {proxyUri.Host}:{proxyUri.Port} for {req.Url}");
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using var upstream = new TcpClient();
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await upstream.ConnectAsync(proxyUri.Host, proxyUri.Port);
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var upstreamStream = upstream.GetStream();
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var outbound = BuildUpstreamHttpRequest(req);
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await upstreamStream.WriteAsync(outbound);
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await Pump(upstreamStream, clientStream, $"conn:{connectionId} HTTP upstream->client");
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}
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// ================= CONNECT =================
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static async Task HandleConnect(NetworkStream clientStream, string target, long connectionId)
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{
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var parts = target.Split(':');
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if (parts.Length != 2 || !int.TryParse(parts[1], out int port))
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{
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Log.Error($"[conn:{connectionId}] invalid CONNECT target: {target}");
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await clientStream.WriteAsync(Encoding.ASCII.GetBytes("HTTP/1.1 400 Bad Request\r\n\r\n"));
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return;
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}
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string host = parts[0];
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var proxyUri = WinHttpHelper.GetProxyForUrl(new Uri($"https://{host}:{port}"));
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if (proxyUri == null)
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{
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Log.Error($"[conn:{connectionId}] no upstream proxy for CONNECT {host}:{port}");
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await Write502(clientStream);
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return;
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}
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Log.Info($"[conn:{connectionId}] CONNECT {host}:{port} via {proxyUri.Host}:{proxyUri.Port}");
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using var upstream = new TcpClient();
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await upstream.ConnectAsync(proxyUri.Host, proxyUri.Port);
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var upstreamStream = upstream.GetStream();
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string connectReq =
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$"CONNECT {host}:{port} HTTP/1.1\r\nHost: {host}:{port}\r\n{UPSTREAM_PROXY_AUTH_HEADER}\r\n";
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await upstreamStream.WriteAsync(Encoding.ASCII.GetBytes(connectReq));
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var resp = await ReadHeaders(upstreamStream, $"conn:{connectionId} upstream-connect-response");
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if (resp == null || !resp.Raw.Contains("200"))
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{
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var status = resp?.Raw?.Split("\r\n", StringSplitOptions.None).FirstOrDefault() ?? "<no response>";
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Log.Error($"[conn:{connectionId}] upstream CONNECT rejected: {status}");
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await clientStream.WriteAsync(Encoding.ASCII.GetBytes("HTTP/1.1 502 Bad Gateway\r\n\r\n"));
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return;
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}
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await clientStream.WriteAsync(Encoding.ASCII.GetBytes("HTTP/1.1 200 Connection Established\r\n\r\n"));
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var t1 = Pump(upstreamStream, clientStream, $"conn:{connectionId} tunnel upstream->client");
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var t2 = Pump(clientStream, upstreamStream, $"conn:{connectionId} tunnel client->upstream");
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await Task.WhenAny(t1, t2);
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}
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// ================= AUTH =================
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static bool CheckAuth(string raw)
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{
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string expected = Convert.ToBase64String(Encoding.ASCII.GetBytes($"{USER}:{PASS}"));
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return raw.Contains($"Proxy-Authorization: Basic {expected}");
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}
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static async Task Write407(NetworkStream stream)
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{
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string resp =
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"HTTP/1.1 407 Proxy Authentication Required\r\n" +
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"Proxy-Authenticate: Basic realm=\"proxy\"\r\n\r\n";
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await stream.WriteAsync(Encoding.ASCII.GetBytes(resp));
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}
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static async Task Write502(NetworkStream stream)
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{
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const string resp = "HTTP/1.1 502 Bad Gateway\r\n\r\n";
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await stream.WriteAsync(Encoding.ASCII.GetBytes(resp));
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}
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// ================= PARSER =================
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class HttpRequest
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{
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public string Method;
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public string Target;
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public string Url;
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public string Raw;
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public byte[] RawBytes;
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public int HeaderLength;
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}
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static async Task<HttpRequest> ReadHeaders(Stream stream, string context)
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{
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try
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{
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var buffer = new byte[8192];
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int read = await stream.ReadAsync(buffer);
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if (read <= 0) return null;
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string raw = Encoding.ASCII.GetString(buffer, 0, read);
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var lines = raw.Split("\r\n");
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var first = lines[0].Split(' ', StringSplitOptions.RemoveEmptyEntries);
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if (first.Length < 2)
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{
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Log.Error($"[{context}] invalid request line: {lines[0]}");
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return null;
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}
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var req = new HttpRequest
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{
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Method = first[0],
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Target = first[1],
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Raw = raw,
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RawBytes = buffer.Take(read).ToArray(),
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HeaderLength = GetHeaderLength(raw)
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};
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if (req.Method != "CONNECT")
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{
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string host = lines
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.FirstOrDefault(l => l.StartsWith("Host:", StringComparison.OrdinalIgnoreCase))
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?.Split(':', 2)[1]
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.Trim();
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req.Url = req.Target.StartsWith("http", StringComparison.OrdinalIgnoreCase)
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? req.Target
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: $"http://{host}{req.Target}";
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}
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return req;
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}
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catch (Exception ex)
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{
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Log.Error($"[{context}] failed to read/parse headers", ex);
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return null;
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}
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}
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// ================= STREAM =================
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static async Task Pump(Stream from, Stream to, string context)
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{
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var buffer = ArrayPool<byte>.Shared.Rent(8192);
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try
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{
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while (true)
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{
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int read = await from.ReadAsync(buffer);
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if (read <= 0) break;
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await to.WriteAsync(buffer.AsMemory(0, read));
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}
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}
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catch (Exception ex)
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{
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if (IsExpectedDisconnect(ex))
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Log.Info($"[{context}] stream closed: {OneLine(ex.Message)}");
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else
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Log.Error($"[{context}] stream pump failed", ex);
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}
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finally
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{
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ArrayPool<byte>.Shared.Return(buffer);
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}
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}
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static bool IsExpectedDisconnect(Exception ex)
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{
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if (ex is ObjectDisposedException)
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return true;
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if (ex is OperationCanceledException)
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return true;
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if (ex is IOException io && io.InnerException is SocketException se)
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{
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return se.SocketErrorCode == SocketError.ConnectionAborted
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|| se.SocketErrorCode == SocketError.ConnectionReset
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|| se.SocketErrorCode == SocketError.Shutdown
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|| se.SocketErrorCode == SocketError.OperationAborted
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|| se.SocketErrorCode == SocketError.TimedOut;
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}
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return false;
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}
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static string OneLine(string message)
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{
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if (string.IsNullOrEmpty(message))
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return string.Empty;
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return message.Replace("\r", " ").Replace("\n", " ").Trim();
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}
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static int GetHeaderLength(string raw)
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{
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int idx = raw.IndexOf("\r\n\r\n", StringComparison.Ordinal);
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return idx >= 0 ? idx + 4 : raw.Length;
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}
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static byte[] BuildUpstreamHttpRequest(HttpRequest req)
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{
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var lines = req.Raw.Split("\r\n", StringSplitOptions.None);
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var sb = new StringBuilder();
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sb.Append(lines[0]).Append("\r\n");
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for (int i = 1; i < lines.Length; i++)
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{
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var line = lines[i];
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if (line.Length == 0)
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break;
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if (line.StartsWith("Proxy-Authorization:", StringComparison.OrdinalIgnoreCase))
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continue; // local proxy auth, must not go upstream
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if (line.StartsWith("Proxy-Connection:", StringComparison.OrdinalIgnoreCase))
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continue;
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sb.Append(line).Append("\r\n");
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}
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if (!string.IsNullOrEmpty(UPSTREAM_PROXY_AUTH_HEADER))
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sb.Append(UPSTREAM_PROXY_AUTH_HEADER);
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sb.Append("\r\n");
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var headerBytes = Encoding.ASCII.GetBytes(sb.ToString());
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if (req.HeaderLength >= req.RawBytes.Length)
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return headerBytes;
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int bodyLen = req.RawBytes.Length - req.HeaderLength;
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var result = new byte[headerBytes.Length + bodyLen];
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Buffer.BlockCopy(headerBytes, 0, result, 0, headerBytes.Length);
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Buffer.BlockCopy(req.RawBytes, req.HeaderLength, result, headerBytes.Length, bodyLen);
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return result;
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}
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static string BuildUpstreamProxyAuthHeader()
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{
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if (string.IsNullOrWhiteSpace(UPSTREAM_USER))
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return string.Empty;
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if (string.IsNullOrEmpty(UPSTREAM_PASS) && !UPSTREAM_ALLOW_EMPTY_PASSWORD)
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{
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Log.Info("UPSTREAM_PASS is empty; upstream Basic auth header is disabled");
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return string.Empty;
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}
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string pass = UPSTREAM_PASS ?? string.Empty;
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string encoded = Convert.ToBase64String(Encoding.ASCII.GetBytes($"{UPSTREAM_USER}:{pass}"));
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return $"Proxy-Authorization: Basic {encoded}\r\n";
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}
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}
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// ================= WINHTTP =================
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static class WinHttpHelper
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{
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const int WINHTTP_ACCESS_TYPE_NO_PROXY = 1;
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const int WINHTTP_AUTOPROXY_AUTO_DETECT = 0x00000001;
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const int WINHTTP_AUTOPROXY_CONFIG_URL = 0x00000002;
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const int WINHTTP_AUTO_DETECT_TYPE_DHCP = 0x00000001;
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const int WINHTTP_AUTO_DETECT_TYPE_DNS_A = 0x00000002;
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[DllImport("winhttp.dll", SetLastError = true)]
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static extern IntPtr WinHttpOpen(string agent, int accessType, string proxy, string bypass, int flags);
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[DllImport("winhttp.dll", SetLastError = true)]
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static extern bool WinHttpGetProxyForUrl(
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IntPtr hSession,
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string url,
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ref WINHTTP_AUTOPROXY_OPTIONS options,
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out WINHTTP_PROXY_INFO proxyInfo);
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[DllImport("winhttp.dll")]
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static extern bool WinHttpCloseHandle(IntPtr handle);
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[DllImport("winhttp.dll", SetLastError = true)]
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static extern bool WinHttpGetDefaultProxyConfiguration(out WINHTTP_PROXY_INFO proxyInfo);
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[DllImport("winhttp.dll", SetLastError = true)]
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static extern bool WinHttpGetIEProxyConfigForCurrentUser(out WINHTTP_CURRENT_USER_IE_PROXY_CONFIG proxyConfig);
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[DllImport("kernel32.dll", SetLastError = true)]
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static extern IntPtr GlobalFree(IntPtr hMem);
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static readonly Uri ForcedUpstreamProxy = ReadForcedUpstreamProxy();
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public static Uri GetProxyForUrl(Uri url)
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{
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if (ForcedUpstreamProxy != null)
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{
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Log.Info($"Using forced upstream proxy {ForcedUpstreamProxy.Host}:{ForcedUpstreamProxy.Port} for {url}");
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return ForcedUpstreamProxy;
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}
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IntPtr session = WinHttpOpen("proxy", WINHTTP_ACCESS_TYPE_NO_PROXY, null, null, 0);
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if (session == IntPtr.Zero)
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{
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Log.Error($"WinHttpOpen failed (Win32={Marshal.GetLastWin32Error()})");
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return null;
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}
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WINHTTP_PROXY_INFO autoInfo = default;
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WINHTTP_PROXY_INFO defaultInfo = default;
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WINHTTP_CURRENT_USER_IE_PROXY_CONFIG ieConfig = default;
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try
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{
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if (WinHttpGetIEProxyConfigForCurrentUser(out ieConfig))
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{
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var autoConfigUrl = PtrToString(ieConfig.lpszAutoConfigUrl);
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bool hasSupportedAutoConfigUrl = !string.IsNullOrWhiteSpace(autoConfigUrl)
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&& (autoConfigUrl.StartsWith("http://", StringComparison.OrdinalIgnoreCase)
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|| autoConfigUrl.StartsWith("https://", StringComparison.OrdinalIgnoreCase));
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if (!string.IsNullOrWhiteSpace(autoConfigUrl) && !hasSupportedAutoConfigUrl)
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{
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Log.Warn($"IE PAC URL has unsupported scheme for WinHTTP: {autoConfigUrl}");
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}
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var options = new WINHTTP_AUTOPROXY_OPTIONS
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{
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dwFlags = 0,
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dwAutoDetectFlags = WINHTTP_AUTO_DETECT_TYPE_DHCP | WINHTTP_AUTO_DETECT_TYPE_DNS_A,
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lpszAutoConfigUrl = hasSupportedAutoConfigUrl ? ieConfig.lpszAutoConfigUrl : IntPtr.Zero,
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fAutoLogonIfChallenged = true
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};
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if (hasSupportedAutoConfigUrl)
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options.dwFlags |= WINHTTP_AUTOPROXY_CONFIG_URL;
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if (ieConfig.fAutoDetect)
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options.dwFlags |= WINHTTP_AUTOPROXY_AUTO_DETECT;
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if (options.dwFlags != 0)
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{
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if (WinHttpGetProxyForUrl(session, url.ToString(), ref options, out autoInfo))
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{
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var proxyUri = ParseProxyInfo(autoInfo, url.Scheme);
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if (proxyUri != null)
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{
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return proxyUri;
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}
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}
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else
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{
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int err = Marshal.GetLastWin32Error();
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Log.Warn($"WinHttpGetProxyForUrl failed for {url} (Win32={err})");
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}
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}
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var ieStaticProxyRaw = PtrToString(ieConfig.lpszProxy);
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var ieStaticProxy = ParseProxyString(ieStaticProxyRaw, url.Scheme);
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if (ieStaticProxy != null)
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{
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Log.Info($"Using IE static proxy {ieStaticProxy.Host}:{ieStaticProxy.Port} for {url}");
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return ieStaticProxy;
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}
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}
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else
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{
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Log.Warn($"WinHttpGetIEProxyConfigForCurrentUser failed (Win32={Marshal.GetLastWin32Error()})");
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}
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if (WinHttpGetDefaultProxyConfiguration(out defaultInfo))
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{
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var fallbackProxy = ParseProxyInfo(defaultInfo, url.Scheme);
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if (fallbackProxy != null)
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{
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Log.Info($"Using default WinHTTP proxy {fallbackProxy.Host}:{fallbackProxy.Port} for {url}");
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return fallbackProxy;
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}
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}
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else
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{
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Log.Warn($"WinHttpGetDefaultProxyConfiguration failed (Win32={Marshal.GetLastWin32Error()})");
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}
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Log.Error($"No system upstream proxy resolved for {url}");
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return null;
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}
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finally
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{
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FreeWinHttpProxyInfo(autoInfo);
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FreeWinHttpProxyInfo(defaultInfo);
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FreeIeConfig(ieConfig);
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WinHttpCloseHandle(session);
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}
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}
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static string PtrToString(IntPtr ptr)
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{
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if (ptr == IntPtr.Zero) return null;
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return Marshal.PtrToStringUni(ptr);
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}
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static Uri ParseProxyInfo(WINHTTP_PROXY_INFO info, string scheme)
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{
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var raw = PtrToString(info.lpszProxy);
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return ParseProxyString(raw, scheme);
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}
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static Uri ParseProxyString(string raw, string scheme)
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{
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if (string.IsNullOrWhiteSpace(raw))
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return null;
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|
|
var parts = raw.Split(';', StringSplitOptions.RemoveEmptyEntries)
|
|
.Select(p => p.Trim())
|
|
.ToArray();
|
|
|
|
string schemeToken = parts.FirstOrDefault(p =>
|
|
p.StartsWith($"{scheme}=", StringComparison.OrdinalIgnoreCase));
|
|
string genericToken = parts.FirstOrDefault(p => p.StartsWith("http=", StringComparison.OrdinalIgnoreCase))
|
|
?? parts.FirstOrDefault(p => p.StartsWith("https=", StringComparison.OrdinalIgnoreCase));
|
|
string first = parts.FirstOrDefault();
|
|
string token = schemeToken ?? genericToken ?? first;
|
|
if (string.IsNullOrWhiteSpace(token))
|
|
return null;
|
|
|
|
var value = token.Contains('=')
|
|
? token.Split('=', 2)[1].Trim()
|
|
: token;
|
|
|
|
if (value.StartsWith("PROXY ", StringComparison.OrdinalIgnoreCase))
|
|
value = value.Substring(6).Trim();
|
|
if (value.Equals("DIRECT", StringComparison.OrdinalIgnoreCase))
|
|
return null;
|
|
|
|
var normalized = value.StartsWith("http://", StringComparison.OrdinalIgnoreCase)
|
|
|| value.StartsWith("https://", StringComparison.OrdinalIgnoreCase)
|
|
? value
|
|
: "http://" + value;
|
|
|
|
if (!Uri.TryCreate(normalized, UriKind.Absolute, out var uri) || string.IsNullOrWhiteSpace(uri.Host))
|
|
{
|
|
Log.Warn($"Cannot parse proxy value '{raw}'");
|
|
return null;
|
|
}
|
|
|
|
return uri;
|
|
}
|
|
|
|
static Uri ReadForcedUpstreamProxy()
|
|
{
|
|
var value = Environment.GetEnvironmentVariable("UPSTREAM_PROXY");
|
|
if (string.IsNullOrWhiteSpace(value))
|
|
return null;
|
|
|
|
var normalized = value.StartsWith("http://", StringComparison.OrdinalIgnoreCase)
|
|
|| value.StartsWith("https://", StringComparison.OrdinalIgnoreCase)
|
|
? value
|
|
: "http://" + value;
|
|
|
|
if (!Uri.TryCreate(normalized, UriKind.Absolute, out var uri) || string.IsNullOrWhiteSpace(uri.Host))
|
|
{
|
|
Log.Error($"Invalid UPSTREAM_PROXY value: '{value}'");
|
|
return null;
|
|
}
|
|
|
|
return uri;
|
|
}
|
|
|
|
static void FreeWinHttpProxyInfo(WINHTTP_PROXY_INFO info)
|
|
{
|
|
if (info.lpszProxy != IntPtr.Zero)
|
|
GlobalFree(info.lpszProxy);
|
|
if (info.lpszProxyBypass != IntPtr.Zero)
|
|
GlobalFree(info.lpszProxyBypass);
|
|
}
|
|
|
|
static void FreeIeConfig(WINHTTP_CURRENT_USER_IE_PROXY_CONFIG config)
|
|
{
|
|
if (config.lpszAutoConfigUrl != IntPtr.Zero)
|
|
GlobalFree(config.lpszAutoConfigUrl);
|
|
if (config.lpszProxy != IntPtr.Zero)
|
|
GlobalFree(config.lpszProxy);
|
|
if (config.lpszProxyBypass != IntPtr.Zero)
|
|
GlobalFree(config.lpszProxyBypass);
|
|
}
|
|
|
|
struct WINHTTP_AUTOPROXY_OPTIONS
|
|
{
|
|
public int dwFlags;
|
|
public int dwAutoDetectFlags;
|
|
public IntPtr lpszAutoConfigUrl;
|
|
public IntPtr lpvReserved;
|
|
public int dwReserved;
|
|
public bool fAutoLogonIfChallenged;
|
|
}
|
|
|
|
struct WINHTTP_PROXY_INFO
|
|
{
|
|
public int dwAccessType;
|
|
public IntPtr lpszProxy;
|
|
public IntPtr lpszProxyBypass;
|
|
}
|
|
|
|
struct WINHTTP_CURRENT_USER_IE_PROXY_CONFIG
|
|
{
|
|
[MarshalAs(UnmanagedType.Bool)]
|
|
public bool fAutoDetect;
|
|
public IntPtr lpszAutoConfigUrl;
|
|
public IntPtr lpszProxy;
|
|
public IntPtr lpszProxyBypass;
|
|
}
|
|
}
|
|
|
|
static class Log
|
|
{
|
|
static readonly object _sync = new();
|
|
|
|
public static void Info(string message) => Write("INF", message);
|
|
public static void Warn(string message) => Write("WRN", message);
|
|
public static void Error(string message, Exception ex = null)
|
|
{
|
|
Write("ERR", ex == null ? message : $"{message}{Environment.NewLine}{ex}");
|
|
}
|
|
|
|
static void Write(string level, string message)
|
|
{
|
|
lock (_sync)
|
|
{
|
|
Console.WriteLine($"[{DateTime.Now:yyyy-MM-dd HH:mm:ss.fff}] [{level}] {message}");
|
|
}
|
|
}
|
|
}
|