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https://github.com/snltty/linker.git
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427 lines
15 KiB
C#
427 lines
15 KiB
C#
using linker.tunnel.connection;
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using linker.libs;
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using linker.libs.extends;
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using System.Collections.Concurrent;
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using System.Net;
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using System.Net.Sockets;
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namespace linker.plugins.forward.proxy
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{
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public partial class ForwardProxy
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{
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private ConcurrentDictionary<int, AsyncUserUdpToken> udpListens = new ConcurrentDictionary<int, AsyncUserUdpToken>();
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private ConcurrentDictionary<ConnectIdUdp, AsyncUserUdpTokenTarget> udpConnections = new(new ConnectIdUdpComparer());
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/// <summary>
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/// 监听一个端口
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/// </summary>
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/// <param name="port"></param>
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private void StartUdp(IPEndPoint ep, byte buffersize)
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{
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try
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{
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Socket socketUdp = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
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socketUdp.EnableBroadcast = true;
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socketUdp.WindowsUdpBug();
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socketUdp.Bind(ep);
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AsyncUserUdpToken asyncUserUdpToken = new AsyncUserUdpToken
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{
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ListenPort = ep.Port,
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SourceSocket = socketUdp,
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Proxy = new ProxyInfo { Port = (ushort)ep.Port, Step = ProxyStep.Forward, ConnectId = 0, Protocol = ProxyProtocol.Udp, Direction = ProxyDirection.Forward }
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};
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udpListens.AddOrUpdate(ep.Port, asyncUserUdpToken, (a, b) => asyncUserUdpToken);
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_ = ReceiveUdp(asyncUserUdpToken, buffersize);
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}
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catch (Exception ex)
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{
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LoggerHelper.Instance.Error(ex);
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}
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}
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private async Task ReceiveUdp(AsyncUserUdpToken token, byte buffersize)
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{
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byte[] bytes = new byte[(1 << buffersize) * 1024];
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IPEndPoint tempRemoteEP = new IPEndPoint(IPAddress.Any, IPEndPoint.MinPort);
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while (true)
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{
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try
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{
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SocketReceiveFromResult result = await token.SourceSocket.ReceiveFromAsync(bytes, tempRemoteEP).ConfigureAwait(false);
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token.Proxy.SourceEP = result.RemoteEndPoint as IPEndPoint;
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token.Proxy.Data = bytes.AsMemory(0, result.ReceivedBytes);
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await ConnectTunnelConnection(token).ConfigureAwait(false);
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if (token.Proxy.TargetEP != null)
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{
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if (token.Connection != null)
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{
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await SendToConnection(token).ConfigureAwait(false);
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}
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else if (token.Connections != null && token.Connections.Count > 0)
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{
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await SendToConnections(token).ConfigureAwait(false);
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}
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}
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}
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catch (Exception ex)
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{
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if (LoggerHelper.Instance.LoggerLevel <= LoggerTypes.DEBUG)
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{
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LoggerHelper.Instance.Error(ex);
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}
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break;
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}
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}
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CloseClientSocket(token);
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}
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/// <summary>
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/// 发送给对方，通过隧道
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/// </summary>
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/// <param name="token"></param>
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/// <returns></returns>
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private async Task SendToConnection(AsyncUserUdpToken token)
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{
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if (token.Connection == null) return;
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byte[] connectData = token.Proxy.ToBytes(out int length);
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try
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{
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bool res = await token.Connection.SendAsync(connectData.AsMemory(0, length)).ConfigureAwait(false);
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if (res == false)
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{
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if (token.Connection.Connected == false)
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await ConnectTunnelConnection(token).ConfigureAwait(false);
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res = await token.Connection.SendAsync(connectData.AsMemory(0, length)).ConfigureAwait(false);
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if (res == false)
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CloseClientSocket(token);
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}
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}
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catch (Exception)
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{
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CloseClientSocket(token);
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}
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finally
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{
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token.Proxy.Return(connectData);
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}
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}
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/// <summary>
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/// 发送给很多对方，通过隧道
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/// </summary>
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/// <param name="token"></param>
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/// <returns></returns>
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private async Task SendToConnections(AsyncUserUdpToken token)
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{
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byte[] connectData = token.Proxy.ToBytes(out int length);
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try
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{
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await Task.WhenAll(token.Connections.Select(c => c.SendAsync(connectData.AsMemory(0, length)))).ConfigureAwait(false);
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}
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catch (Exception)
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{
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CloseClientSocket(token);
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}
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finally
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{
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token.Proxy.Return(connectData);
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}
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}
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/// <summary>
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/// 收到隧道数据，确定是udp，该连接连接，该发送发送
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/// </summary>
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/// <param name="tunnelToken"></param>
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/// <returns></returns>
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private async Task SendToSocketUdp(AsyncUserTunnelToken tunnelToken)
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{
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if (tunnelToken.Proxy.Direction == ProxyDirection.Forward)
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{
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ConnectIdUdp connectId = tunnelToken.GetUdpConnectId();
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try
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{
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IPEndPoint target = new IPEndPoint(tunnelToken.Proxy.TargetEP.Address, tunnelToken.Proxy.TargetEP.Port);
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if (udpConnections.TryGetValue(connectId, out AsyncUserUdpTokenTarget token))
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{
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token.Connection = tunnelToken.Connection;
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await token.TargetSocket.SendToAsync(tunnelToken.Proxy.Data, target).ConfigureAwait(false);
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token.LastTicks.Update();
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return;
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}
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_ = ConnectUdp(tunnelToken, target);
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}
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catch (Exception ex)
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{
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if (LoggerHelper.Instance.LoggerLevel <= LoggerTypes.DEBUG)
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{
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LoggerHelper.Instance.Error(ex);
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}
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if (udpConnections.TryRemove(connectId, out AsyncUserUdpTokenTarget token))
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{
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CloseClientSocket(token);
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}
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}
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}
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else
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{
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if (udpListens.TryGetValue(tunnelToken.Proxy.Port, out AsyncUserUdpToken asyncUserUdpToken))
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{
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try
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{
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asyncUserUdpToken.Connection = tunnelToken.Connection;
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await asyncUserUdpToken.SourceSocket.SendToAsync(tunnelToken.Proxy.Data, tunnelToken.Proxy.SourceEP).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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if (LoggerHelper.Instance.LoggerLevel <= LoggerTypes.DEBUG)
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{
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LoggerHelper.Instance.Error(ex);
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}
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}
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}
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}
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}
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private async Task ConnectUdp(AsyncUserTunnelToken tunnelToken, IPEndPoint target)
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{
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Socket socket = new Socket(target.AddressFamily, SocketType.Dgram, ProtocolType.Udp);
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socket.WindowsUdpBug();
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await socket.SendToAsync(tunnelToken.Proxy.Data, target).ConfigureAwait(false);
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ConnectIdUdp connectId = tunnelToken.GetUdpConnectId();
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AsyncUserUdpTokenTarget udpToken = new AsyncUserUdpTokenTarget
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{
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Proxy = new ProxyInfo
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{
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ConnectId = tunnelToken.Proxy.ConnectId,
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Direction = ProxyDirection.Reverse,
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Protocol = tunnelToken.Proxy.Protocol,
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SourceEP = tunnelToken.Proxy.SourceEP,
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TargetEP = tunnelToken.Proxy.TargetEP,
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Step = ProxyStep.Forward,
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Port = tunnelToken.Proxy.Port,
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BufferSize = tunnelToken.Proxy.BufferSize,
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},
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TargetSocket = socket,
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ConnectId = connectId,
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Connection = tunnelToken.Connection,
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Buffer = new byte[(1 << tunnelToken.Proxy.BufferSize) * 1024]
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};
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udpToken.Proxy.Direction = ProxyDirection.Reverse;
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udpConnections.AddOrUpdate(connectId, udpToken, (a, b) => udpToken);
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try
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{
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while (true)
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{
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SocketReceiveFromResult result = await socket.ReceiveFromAsync(udpToken.Buffer, SocketFlags.None, target).ConfigureAwait(false);
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udpToken.Proxy.Data = udpToken.Buffer.AsMemory(0, result.ReceivedBytes);
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udpToken.LastTicks.Update();
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await SendToConnection(udpToken).ConfigureAwait(false);
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}
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}
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catch (Exception)
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{
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}
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finally
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{
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if (udpConnections.TryRemove(connectId, out AsyncUserUdpTokenTarget token))
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{
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CloseClientSocket(token);
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}
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}
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}
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/// <summary>
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/// b端接收到服务的数据，通过隧道发送给a
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/// </summary>
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/// <param name="token"></param>
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/// <returns></returns>
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private async Task SendToConnection(AsyncUserUdpTokenTarget token)
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{
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byte[] connectData = token.Proxy.ToBytes(out int length);
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try
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{
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bool res = await token.Connection.SendAsync(connectData.AsMemory(0, length)).ConfigureAwait(false);
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if (res == false)
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{
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CloseClientSocket(token);
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}
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}
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catch (Exception)
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{
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CloseClientSocket(token);
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}
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finally
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{
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token.Proxy.Return(connectData);
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}
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}
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/// <summary>
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/// 检查udp过期
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/// </summary>
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private void TaskUdp()
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{
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TimerHelper.SetInterval(() =>
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{
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if(udpConnections.Count > 0)
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{
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var connections = udpConnections.Where(c => c.Value.Timeout).Select(c => c.Key).ToList();
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foreach (var item in connections)
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{
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if (udpConnections.TryRemove(item, out AsyncUserUdpTokenTarget token))
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{
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try
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{
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token.Clear();
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}
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catch (Exception)
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{
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}
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}
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}
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}
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return true;
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}, 30000);
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}
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private void CloseClientSocketUdp(ITunnelConnection connection)
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{
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int hashcode1 = connection.RemoteMachineId.GetHashCode();
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int hashcode2 = connection.TransactionId.GetHashCode();
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var tokens = udpConnections.Where(c => c.Key.hashcode1 == hashcode1 && c.Key.hashcode2 == hashcode2).ToList();
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foreach (var item in tokens)
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{
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try
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{
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if (udpConnections.TryRemove(item.Key, out AsyncUserUdpTokenTarget token))
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{
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token.Clear();
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}
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}
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catch (Exception)
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{
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}
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}
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}
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private void CloseClientSocket(AsyncUserUdpToken token)
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{
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if (token == null) return;
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token.Clear();
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}
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private void CloseClientSocket(AsyncUserUdpTokenTarget token)
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{
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if (token == null) return;
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if (udpConnections.TryRemove(token.ConnectId, out _))
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{
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token.Clear();
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}
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token.Clear();
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}
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private void StopUdp()
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{
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foreach (var item in udpListens)
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{
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item.Value.Clear();
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}
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udpListens.Clear();
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foreach (var item in udpConnections)
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{
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item.Value.Clear();
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}
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udpConnections.Clear();
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}
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private void StopUdp(int port)
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{
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if (udpListens.TryRemove(port, out AsyncUserUdpToken udpClient))
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{
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udpClient.Clear();
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}
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if (udpListens.Count == 0)
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{
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foreach (var item in udpConnections)
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{
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item.Value.Clear();
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}
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udpConnections.Clear();
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}
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}
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}
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public sealed class AsyncUserUdpToken
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{
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public int ListenPort { get; set; }
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public Socket SourceSocket { get; set; }
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public ITunnelConnection Connection { get; set; }
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public List<ITunnelConnection> Connections { get; set; }
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public ProxyInfo Proxy { get; set; }
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public void Clear()
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{
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SourceSocket?.SafeClose();
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SourceSocket = null;
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GC.Collect();
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GC.SuppressFinalize(this);
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}
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}
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public sealed class AsyncUserUdpTokenTarget
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{
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public Socket TargetSocket { get; set; }
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public ITunnelConnection Connection { get; set; }
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public ProxyInfo Proxy { get; set; }
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public ConnectIdUdp ConnectId { get; set; }
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public byte[] Buffer { get; set; }
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public LastTicksManager LastTicks { get; set; } = new LastTicksManager();
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public bool Timeout => LastTicks.Expired(60 * 1000);
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public void Clear()
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{
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TargetSocket?.SafeClose();
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TargetSocket = null;
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GC.Collect();
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GC.SuppressFinalize(this);
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}
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}
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public sealed class ConnectIdUdpComparer : IEqualityComparer<ConnectIdUdp>
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{
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public bool Equals(ConnectIdUdp x, ConnectIdUdp y)
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{
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return x.source != null && x.source.Equals(y.source) && x.hashcode1 == y.hashcode1 && x.hashcode2 == y.hashcode2;
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}
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public int GetHashCode(ConnectIdUdp obj)
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{
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if (obj.source == null) return 0;
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return obj.source.GetHashCode() ^ obj.hashcode1 ^ obj.hashcode2;
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}
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}
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public readonly struct ConnectIdUdp
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{
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public readonly IPEndPoint source { get; }
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public int hashcode1 { get; }
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public int hashcode2 { get; }
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public ConnectIdUdp(IPEndPoint source, int hashcode1, int hashcode2)
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{
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this.source = source;
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this.hashcode1 = hashcode1;
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this.hashcode2 = hashcode2;
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}
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}
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}
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