【发布时间】：2013-07-20 04:50:19
【问题描述】：
与我的other question 相关，但现在我尝试异步，希望它能解决问题。没有。
我正在尝试创建一个简单的 SOCKS5 服务器。我将浏览器（firefox）设置为将此程序用作 SOCKS5。这个想法是一个程序连接到代理服务器，给它所需的信息，服务器只是简单地从一个连接读取/写入数据到另一个。这个只是简单地做到这一点，不记录也不过滤任何东西。它非常简单，但是由于 CPU 问题以及在您点击几页后连接到站点需要几秒钟的事实，这使得它完全无法使用。这到底是怎么吃掉这么多CPU的？为什么连接网站需要很长时间？异步和同步都受此影响
using System;
using System.Collections.Concurrent;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net.Sockets;
using System.Timers;
using System.IO;
using System.Net;
using System.Threading;
namespace ProxyTest
{
class Program
{
static ManualResetEvent tcpClientConnected =new ManualResetEvent(false);
static void Main(string[] args)
{
var s2 = new TcpListener(9998);
s2.Start();
Task.Run(() =>
{
while (true)
{
tcpClientConnected.Reset();
s2.BeginAcceptTcpClient(Blah, s2);
tcpClientConnected.WaitOne();
}
});
while (true)
System.Threading.Thread.Sleep(10000000);
}
static void Blah(IAsyncResult ar)
{
try
{
Console.WriteLine("Connection");
TcpListener listener = (TcpListener)ar.AsyncState;
using (var socketin = listener.EndAcceptTcpClient(ar))
{
tcpClientConnected.Set();
var ns1 = socketin.GetStream();
var r1 = new BinaryReader(ns1);
var w1 = new BinaryWriter(ns1);
if (false)
{
var s3 = new TcpClient();
s3.Connect("127.0.0.1", 9150);
var ns3 = s3.GetStream();
var r3 = new BinaryReader(ns3);
var w3 = new BinaryWriter(ns3);
while (true)
{
while (ns1.DataAvailable)
{
var b = ns1.ReadByte();
w3.Write((byte)b);
//Console.WriteLine("1: {0}", b);
}
while (ns3.DataAvailable)
{
var b = ns3.ReadByte();
w1.Write((byte)b);
Console.WriteLine("2: {0}", b);
}
}
}
{
if (!(r1.ReadByte() == 5 && r1.ReadByte() == 1))
return;
var c = r1.ReadByte();
for (int i = 0; i < c; ++i)
r1.ReadByte();
w1.Write((byte)5);
w1.Write((byte)0);
}
{
if (!(r1.ReadByte() == 5 && r1.ReadByte() == 1))
return;
if (r1.ReadByte() != 0)
return;
}
byte[] ipAddr = null;
string hostname = null;
var type = r1.ReadByte();
switch (type)
{
case 1:
ipAddr = r1.ReadBytes(4);
break;
case 3:
hostname = Encoding.ASCII.GetString(r1.ReadBytes(r1.ReadByte()));
break;
case 4:
throw new Exception();
}
var nhport = r1.ReadInt16();
var port = IPAddress.NetworkToHostOrder(nhport);
var socketout = new TcpClient();
if (hostname != null)
socketout.Connect(hostname, port);
else
socketout.Connect(new IPAddress(ipAddr), port);
w1.Write((byte)5);
w1.Write((byte)0);
w1.Write((byte)0);
w1.Write(type);
switch (type)
{
case 1:
w1.Write(ipAddr);
break;
case 2:
w1.Write((byte)hostname.Length);
w1.Write(Encoding.ASCII.GetBytes(hostname), 0, hostname.Length);
break;
}
w1.Write(nhport);
var buf1 = new byte[4096];
var buf2 = new byte[4096];
var ns2 = socketout.GetStream();
var r2 = new BinaryReader(ns2);
var w2 = new BinaryWriter(ns2);
Task.Run(() =>
{
var re = new ManualResetEvent(false);
while (true)
{
re.Reset();
ns1.BeginRead(buf1, 0, buf1.Length, ReadCallback, new A() { buf = buf1, thisSocket = socketin, otherSocket = socketout, thisStream = ns1, otherStream = ns2, re=re });
re.WaitOne();
}
});
Task.Run(() =>
{
var re = new ManualResetEvent(false);
while (true)
{
re.Reset();
ns2.BeginRead(buf2, 0, buf2.Length, ReadCallback, new A() { buf = buf2, thisSocket = socketout, otherSocket = socketin, thisStream = ns2, otherStream = ns1, re = re });
re.WaitOne();
}
});
while (true)
{
if (socketin.Connected == false)
return;
Thread.Sleep(100);
}
}
}
catch { }
}
class A { public byte[] buf; public TcpClient thisSocket, otherSocket; public NetworkStream thisStream, otherStream; public ManualResetEvent re;};
static void ReadCallback(IAsyncResult ar)
{
try
{
var a = (A)ar.AsyncState;
var ns1 = a.thisStream;
var len = ns1.EndRead(ar);
a.otherStream.Write(a.buf, 0, len);
a.re.Set();
}
catch
{
}
}
}
}
【问题讨论】：
-
我认为问题与您的其他同步问题相同（我已在此处发表评论）：socketin.Connected == false 测试永远不会正确，因此代码将所有时间都花在Thread.Sleep，所有 Blah 调用都不会终止。
标签： c# .net sockets proxy tcpclient