public byte[] ToPackets()
{
var bPack = new List <byte>();
switch (this.Phase)
{
case Socks5Phase.spGreeting:
if (this.Credential == null)
{
//匿名代理
bPack.Add(5);
bPack.Add(1);
bPack.Add(0);
this.Phase = Socks5Phase.spConnecting;
}
else
{
//匿名或用户名密码代理
bPack.Add(5);
bPack.Add(2);
bPack.Add(0);
bPack.Add(2);
this.Phase = Socks5Phase.spAuthenticating;
}
break;
case Socks5Phase.spAuthenticating:
if (this.Credential == null)
{
throw new ProxyAuthException(403, "Socks5 Server request a credential");
}
bPack.Add(1);
bPack.Add(Convert.ToByte(this.Credential.UserName.Length));
bPack.AddRange(Encoding.ASCII.GetBytes(this.Credential.UserName));
bPack.Add(Convert.ToByte(this.Credential.Password.Length));
bPack.AddRange(Encoding.ASCII.GetBytes(this.Credential.Password));
this.Phase = Socks5Phase.spConnecting;
break;
case Socks5Phase.spConnecting:
bPack.Add(5);
bPack.Add((byte)this.Command);
bPack.Add(0);
bPack.Add((byte)((this.EndPoint is DnsEndPoint) ? 3 : 1));
Socks4Request.PackIn(bPack, this.EndPoint);
break;
}
return(bPack.ToArray());
}
public byte[] ToPackets()
{
var bPack = new List <byte>();
bPack.Add(0x00);
bPack.Add((byte)this.Status);
Socks4Request.PackIn(bPack, this.RemoteEndPoint, false);
return(bPack.ToArray());
}
public void ParsePack(byte[] bPack)
{
switch (this.Phase)
{
case Socks5Request.Socks5Phase.spGreeting:
if (bPack[0] != 5)
{
throw new ProxyAuthException(403, "Only Socks5 response are supported");
}
if (bPack[1] == 0xFF)
{
throw new ProxyAuthException(0xFF, "Authentication method not supported");
}
if (this.Anonymous = bPack[1] == 0)
{
this.Phase = Socks5Request.Socks5Phase.spConnecting;
}
else
{
this.Phase = Socks5Request.Socks5Phase.spAuthenticating;
}
break;
case Socks5Request.Socks5Phase.spAuthenticating:
if (bPack[0] != 1)
{
throw new ProxyAuthException(403, "Only Socks5 response are supported");
}
this.Phase = Socks5Request.Socks5Phase.spConnecting;
this.Status = (ResponseStatus)bPack[1];
if (this.Status != ResponseStatus.Success)
{
throw new ProxyAuthException((int)this.Status, this.Status.ToDescription());
}
break;
case Socks5Request.Socks5Phase.spConnecting:
if (bPack[0] != 5)
{
throw new ProxyAuthException(403, "Only Socks5 response are supported");
}
int offset = 4;
IPEndPoint ipe;
Socks4Request.PackOut(bPack, ref offset, out ipe);
this.RemoteEndPoint = ipe;
break;
}
}
public void UdpDirectReceive(HttpContext context, UdpClient proxyClient)
{
context.Server.ScriptTimeout = int.MaxValue;
HttpRequest Request = context.Request;
HttpResponse Response = context.Response;
Response.AppendHeader(HttpResponseHeader.Connection.ToString(), "close");
var bPack = new List <byte>();
while (Response.IsClientConnected)
{
try
{
var remoteIpe = new IPEndPoint(IPAddress.Any, IPEndPoint.MinPort);
byte[] data = proxyClient.Receive(ref remoteIpe);
if (!Response.IsClientConnected)
{
break;
}
bPack.Clear();
Socks4Request.PackIn(bPack, remoteIpe);
bPack.AddRange(data);
byte[] bData = bPack.ToArray();
Response.OutputStream.Write(bData, 0, bData.Length);
Response.Flush();
App.LogInfo("UdpDirectReceive from {0} {1}bytes.", remoteIpe, data.Length);
}
catch (ObjectDisposedException ex)
{
#if DEBUG
App.LogInfo(string.Format("Predictable objectDisposed exception: {0}", ex.StackTrace));
#endif
}
catch (IOException ex)
{
TunnelExceptionHandler.Handle(ex, proxyClient.Client, "UdpDirectReceive");
}
catch (SocketException ex)
{
if (ex.SocketErrorCode == SocketError.Interrupted)
{
#if DEBUG
App.LogInfo(string.Format("Predictable interrupted exception: {0}", ex.Message));
#endif
return;
}
TunnelExceptionHandler.Handle(ex, proxyClient.Client, "UdpDirectReceive");
}
}
}
public byte[] ToPackets()
{
var bPack = new List <byte>();
switch (this.Phase)
{
case Socks5Request.Socks5Phase.spGreeting:
if (this.Anonymous)
{
bPack.Add(5);
bPack.Add(0);
this.Phase = Socks5Request.Socks5Phase.spConnecting;
}
else
{
bPack.Add(5);
bPack.Add(2);
this.Phase = Socks5Request.Socks5Phase.spAuthenticating;
}
break;
case Socks5Request.Socks5Phase.spAuthenticating:
if (this.Status != ResponseStatus.Success)
{
throw new ProxyAuthException(403, "Authentication failure, connection must be closed");
}
bPack.Add(1);
bPack.Add((byte)this.Status);
this.Phase = Socks5Request.Socks5Phase.spConnecting;
break;
case Socks5Request.Socks5Phase.spConnecting:
bPack.Add(5);
bPack.Add(0);
bPack.Add(0);
bPack.Add(1);
Socks4Request.PackIn(bPack, this.RemoteEndPoint);
break;
}
return(bPack.ToArray());
}
public void ParsePack(byte[] bPack)
{
if (bPack[0] != 0x00)
{
throw new ProxyAuthException(403, "Only Socks4/4a response are supported");
}
var response = this;
response.Status = (ResponseStatus)bPack[1];
int offset = 2;
IPEndPoint ipe;
Socks4Request.PackOut(bPack, ref offset, out ipe, false);
response.RemoteEndPoint = ipe;
if (response.Status != Socks4Response.ResponseStatus.RequestGranted)
{
throw new ProxyAuthException((int)response.Status, response.Status.ToDescription());
}
}
private void UdpDirectReceive(object state)
{
var controlClient = (TcpClient)state;
if (!controlClient.Connected)
{
return;
}
IPEndPoint remoteIpe = null;
try
{
var currentState = this.GetUdpClientState(controlClient);
//Udp无连接先发送后接收
currentState.WaitOnce();
var tunnel = this.CreateTunnel(TunnelCommand.UdpReceive, controlClient);
tunnel.SendReceiveTimeout = Timeout.Infinite;
var response = tunnel.GetResponse(webResponse =>
{
var pushStream = webResponse.GetResponseStream();
byte[] data = new byte[(int)BufferSizeof.MaxSocket];
//00 00 00 01
data[3] = 1;
while (controlClient.Connected && pushStream.CanRead)
{
try
{
int offset = 4;
int read = pushStream.Read(data, offset, data.Length - offset);
if (read == 0 || !(controlClient.Connected && pushStream.CanRead))
{
break;
}
//4-10 中间6字节为remoteIpe
Socks4Request.PackOut(data, ref offset, out remoteIpe);
if (!currentState.HasRemoteEndPoint(remoteIpe))
{
this.OutWrite("Udp Receive Discard {0} {1}bytes.", remoteIpe, read);
App.LogInfo("Udp Receive Discard 非法远程端点.");
continue;
}
int length = 4 + read;
int sent = currentState.Client.Send(data, length, currentState.LocalEndPoint);
if (length != sent)
{
throw new InvalidOperationException("Udp数据包错误");
}
this.OutWrite("Udp {0} Receive {1}\t{2}bytes.", currentState.LocalEndPoint, remoteIpe, read);
}
catch (ObjectDisposedException ex)
{
#if DEBUG
App.LogInfo(string.Format("Predictable objectDisposed exception: {0}", ex.StackTrace));
#endif
return;
}
catch (IOException ex)
{
TunnelExceptionHandler.Handle(ex, controlClient.Client, string.Format("UdpDirectReceive={0}", remoteIpe));
}
catch (SocketException ex)
{
TunnelExceptionHandler.Handle(ex, controlClient.Client, string.Format("UdpDirectReceive={0}", remoteIpe));
}
}
});
response.Close();
}
catch (WebException ex)
{
bool isRejected;
TunnelExceptionHandler.Handle(ex, string.Format("UdpDirectReceive={0}", remoteIpe), _output, out isRejected);
if (isRejected)
{
this.OnServerRejected();
}
}
catch (Exception ex)
{
TunnelExceptionHandler.Handle(ex, string.Format("UdpDirectReceive={0}", remoteIpe));
}
}
private void UdpDirectSend(object state)
{
var controlClient = (TcpClient)state;
if (!controlClient.Connected)
{
return;
}
string destIpe = null;
try
{
var currentState = this.GetUdpClientState(controlClient);
while (controlClient.Connected)
{
try
{
var localIpe = new IPEndPoint(IPAddress.Any, IPEndPoint.MinPort);
byte[] data = currentState.Client.Receive(ref localIpe);
if (!controlClient.Connected)
{
break;
}
if (data.IsNullOrEmpty() || !(data[0] == 0 && data[1] == 0 && data[2] == 0))
{
this.OutWrite("Udp Send Discard {0} {1}bytes.", localIpe, data == null ? -1 : data.Length);
App.LogInfo("Udp Send Discard 非法数据包.");
continue;
}
else if (!currentState.LocalEndPoint.Equals(localIpe))
{
this.OutWrite("Udp Send Discard {0} {1}bytes.", localIpe, data == null ? -1 : data.Length);
App.LogInfo("Udp Send Discard 非法本地端点.");
continue;
}
int offset = 4;
if (data[3] == 3)
{
DnsEndPoint de;
Socks4Request.PackOut(data, ref offset, out de);
currentState.AddRemoteEndPoint(de);
destIpe = string.Format("{0}:{1}", de.Host, de.Port);
}
else
{
IPEndPoint ipe;
Socks4Request.PackOut(data, ref offset, out ipe);
currentState.AddRemoteEndPoint(ipe);
destIpe = ipe.ToString();
}
var tunnel = this.CreateTunnel(TunnelCommand.UdpSend, controlClient);
tunnel.Headers[xHttpHandler.AgentDirect] = destIpe;
var outStream = new MemoryStream(data, offset, data.Length - offset);
#if DEBUG
tunnel.Form[xHttpHandler.AgentChecksum] = CryptoManaged.MD5Hash(outStream).ToString();
outStream.Position = 0L;
#endif
tunnel.Files.Add(new HttpFileContent(xHttpHandler.AgentDirect, xHttpHandler.AgentDirect, outStream));
var response = tunnel.GetResponse();
if (response.GetResponseText() != "1")
{
this.OutWrite("Udp {0} Send {1}\t{2}bytes failure.", currentState.LocalEndPoint, destIpe, outStream.Length);
return;
}
this.OutWrite("Udp {0} Send {1}\t{2}bytes.", currentState.LocalEndPoint, destIpe, outStream.Length);
//开始接收数据
currentState.SetOnce();
}
catch (ObjectDisposedException ex)
{
#if DEBUG
App.LogInfo(string.Format("Predictable objectDisposed exception: {0}", ex.StackTrace));
#endif
}
catch (WebException ex)
{
bool isRejected;
if (TunnelExceptionHandler.Handle(ex, string.Format("UdpDirectSend={0}", destIpe), _output, out isRejected))
{
controlClient.Client.Close();
}
if (isRejected)
{
this.OnServerRejected();
}
}
catch (SocketException ex)
{
if (ex.SocketErrorCode == SocketError.Interrupted)
{
#if DEBUG
App.LogInfo(string.Format("Predictable interrupted exception: {0}", ex.Message));
#endif
return;
}
TunnelExceptionHandler.Handle(ex, controlClient.Client, string.Format("UdpDirectSend={0}", destIpe));
}
}
}
catch (Exception ex)
{
TunnelExceptionHandler.Handle(ex, string.Format("UdpDirectSend={0}", destIpe));
}
}
public void ParsePack(byte[] bPack)
{
switch (this.Phase)
{
case Socks5Phase.spGreeting:
{
if (bPack[0] != 5)
{
throw new ProxyAuthException(403, "Only Socks5 request are supported");
}
//要求匿名代理
if (bPack[1] == 1 && bPack[2] == 0)
{
this.Credential = null;
this.Phase = Socks5Phase.spConnecting;
}
//要求匿名或用户名密码代理
else
{
this.Credential = new NetworkCredential();
this.Phase = Socks5Phase.spAuthenticating;
}
}
break;
case Socks5Phase.spAuthenticating:
{
if (bPack[0] != 1)
{
throw new ProxyAuthException(403, "Only Socks5 request are supported");
}
if (this.Credential == null)
{
throw new ProxyAuthException(403, "Socks5Phase.spAuthenticating");
}
int length = Convert.ToInt32(bPack[1]);
this.Credential.UserName = Encoding.ASCII.GetString(bPack, 2, length);
int offset = 2 + length;
length = Convert.ToInt32(bPack[offset]);
this.Credential.Password = Encoding.ASCII.GetString(bPack, offset + 1, length);
this.Phase = Socks5Phase.spConnecting;
}
break;
case Socks5Phase.spConnecting:
{
if (bPack[0] != 5 || bPack[2] != 0)
{
throw new ProxyAuthException(403, "Only Socks5 request are supported");
}
this.Command = (Socks5Command)bPack[1];
int offset = 4;
if (bPack[3] == 3)
{
DnsEndPoint de;
Socks4Request.PackOut(bPack, ref offset, out de);
this.EndPoint = de;
}
else
{
IPEndPoint ipe;
Socks4Request.PackOut(bPack, ref offset, out ipe);
this.EndPoint = ipe;
}
}
break;
}
}
private void AcceptCallback(IAsyncResult ar)
{
if (_listener == null)
{
return;
}
_listener.BeginAcceptTcpClient(this.AcceptCallback, null);
var proxyClient = _listener.EndAcceptTcpClient(ar);
if (_runType.HasValue)
{
var proxySock = proxyClient.Client;
byte[] buffer = new byte[256];
try
{
switch (_runType.Value)
{
case SocksProxyType.Socks4:
case SocksProxyType.Socks4a:
{
int recv = proxySock.Receive(buffer);
var request = new Socks4Request();
request.ParsePack(buffer);
if (request.Command == Socks4Command.Bind)
{
App.LogInfo("{0} {1}协议错误: Bind命令暂不支持", proxySock.LocalEndPoint, _runType);
goto default;
}
var resIpe = new IPEndPoint(request.RemoteIP, request.RemotePort);
var response = new Socks4Response(resIpe);
response.Status = Socks4Response.ResponseStatus.RequestGranted;
proxySock.Send(response.ToPackets());
var destIpe = request.ProxyType == SocksProxyType.Socks4a ? (EndPoint) new DnsEndPoint(request.RemoteHost, request.RemotePort) : resIpe;
this.PushTcpClient(proxyClient, destIpe);
}
break;
case SocksProxyType.Socks5:
{
var request = new Socks5Request();
var response = new Socks5Response();
proxySock.Receive(buffer);
request.ParsePack(buffer);
if (request.Credential == null)
{
//请求匿名
response.Anonymous = true;
proxySock.Send(response.ToPackets());
}
else
{
response.Anonymous = false;
proxySock.Send(response.ToPackets());
proxySock.Receive(buffer);
request.ParsePack(buffer);
var cred = request.Credential;
//验证凭证
//if (!true)
//{
// goto default;
//}
response.Status = Socks5Response.ResponseStatus.Success;
proxySock.Send(response.ToPackets());
}
proxySock.Receive(buffer);
request.ParsePack(buffer);
bool isDns = request.EndPoint is DnsEndPoint;
var resIpe = isDns ? new IPEndPoint(IPAddress.Any, IPEndPoint.MinPort) : (IPEndPoint)request.EndPoint;
switch (request.Command)
{
case Socks5Command.TcpBind:
App.LogInfo("{0} {1}协议错误: Bind命令暂不支持", proxySock.LocalEndPoint, _runType);
goto default;
case Socks5Command.UdpAssociate:
//客户端预备开放的Udp端口
int clientPort = isDns ? ((DnsEndPoint)request.EndPoint).Port : ((IPEndPoint)request.EndPoint).Port;
//服务端开放的Udp端点
IPEndPoint localIpe;
this.PushUdpClient(proxyClient, clientPort, out localIpe);
response.RemoteEndPoint = localIpe;
proxySock.Send(response.ToPackets());
return;
default:
response.RemoteEndPoint = resIpe;
proxySock.Send(response.ToPackets());
this.PushTcpClient(proxyClient, request.EndPoint);
break;
}
}
break;
case SocksProxyType.Http:
{
//GoAgent集成不做任何协议处理
this.PushTcpClient(proxyClient, xHttpHandler.GoAgent);
}
break;
default:
proxyClient.Close();
return;
}
}
catch (Exception ex)
{
this.OutWrite("{0} {1}协议错误: {2}", proxySock.LocalEndPoint, _runType, ex.Message);
App.LogError(ex, "代理协议错误");
proxyClient.Close();
return;
}
}
else
{
this.PushTcpClient(proxyClient, _remoteEndPoint);
}
TaskHelper.Factory.StartNew(this.DirectReceive, new object[] { proxyClient });
TaskHelper.Factory.StartNew(this.DirectSend, new object[] { proxyClient });
}
