Question

C#客户端实现设置代理上网

如图，我设置好后能连接上网就可以了。
client = new TcpClient(m_RemoteIP, m_RemotePort);
client.ReceiveTimeout = 1000;
client.SendTimeout = 2000;
stream = client.GetStream();
byte[] data = Encoding.ASCII.GetBytes(xml);
stream.Write(data, 0, data.Length);
stream.Flush();
data = new byte[256];
string responseData = string.Empty;
//***********下行就是接收server返回信息,不加入的话server端就可以接收到这里发送的数据,加入的话server就一直处于等待读取client发送数据的状态,导致这里报错*************/
//Int32 bytes = client.GetStream().Read(data, 0, data.Length); //就是这句话出错，错误信息是“无法从传输连接中读取数据: 由于连接方在一段时间后没有正确答复或连接的主机没有反应，连接尝试失败。。”
//responseData = Encoding.ASCII.GetString(data, 0, bytes);
stream.Close();
client.Close();

Answer 1

代理服务器上网分HTTP连接，Socket4 和 Socket5。

从几个语句看不出问题，我给个样板吧。是Socket5连接的，

using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

/*
* zahmed
* Date 23 Jan 2004
* Socks 5 RFC is available at http://www.faqs.org/rfcs/rfc1928.html.
*/
namespace ConProxy
{
public class ConnectionException:ApplicationException
{
public ConnectionException(string message)
:base(message)
{
}
}

/// <summary>
/// Provides sock5 functionality to clients (Connect only).
/// </summary>
public class SocksProxy
{

private SocksProxy(){}

#region ErrorMessages
private static string[] errorMsgs= {
"Operation completed successfully.",
"General SOCKS server failure.",
"Connection not allowed by ruleset.",
"Network unreachable.",
"Host unreachable.",
"Connection refused.",
"TTL expired.",
"Command not supported.",
"Address type not supported.",
"Unknown error."
};
#endregion

public static Socket ConnectToSocks5Proxy(string proxyAdress, ushort proxyPort, string destAddress, ushort destPort,
string userName, string password)
{
IPAddress destIP = null;
IPAddress proxyIP = null;
byte[] request = new byte[257];
byte[] response = new byte[257];
ushort nIndex;

try
{
proxyIP = IPAddress.Parse(proxyAdress);
}
catch(FormatException)
{ // get the IP address
proxyIP = Dns.GetHostByAddress(proxyAdress).AddressList[0];
}

// Parse destAddress (assume it in string dotted format "212.116.65.112" )
try
{
destIP = IPAddress.Parse(destAddress);
}
catch(FormatException)
{
// wrong assumption its in domain name format "www.microsoft.com"
}

IPEndPoint proxyEndPoint = new IPEndPoint(proxyIP,proxyPort);

// open a TCP connection to SOCKS server...
Socket s = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
s.Connect(proxyEndPoint);

nIndex = 0;
request[nIndex++]=0x05; // Version 5.
request[nIndex++]=0x02; // 2 Authentication methods are in packet...
request[nIndex++]=0x00; // NO AUTHENTICATION REQUIRED
request[nIndex++]=0x02; // USERNAME/PASSWORD
// Send the authentication negotiation request...
s.Send(request,nIndex,SocketFlags.None);

// Receive 2 byte response...
int nGot = s.Receive(response,2,SocketFlags.None);
if (nGot!=2)
throw new ConnectionException("Bad response received from proxy server.");

if (response[1]==0xFF)
{ // No authentication method was accepted close the socket.
s.Close();
throw new ConnectionException("None of the authentication method was accepted by proxy server.");
}

byte[] rawBytes;

if (/*response[1]==0x02*/true)
{//Username/Password Authentication protocol
nIndex = 0;
request[nIndex++]=0x05; // Version 5.

// add user name
request[nIndex++]=(byte)userName.Length;
rawBytes = Encoding.Default.GetBytes(userName);
rawBytes.CopyTo(request,nIndex);
nIndex+=(ushort)rawBytes.Length;

// add password
request[nIndex++]=(byte)password.Length;
rawBytes = Encoding.Default.GetBytes(password);
rawBytes.CopyTo(request,nIndex);
nIndex+=(ushort)rawBytes.Length;

// Send the Username/Password request
s.Send(request,nIndex,SocketFlags.None);
// Receive 2 byte response...
nGot = s.Receive(response,2,SocketFlags.None);
if (nGot!=2)
throw new ConnectionException("Bad response received from proxy server.");
if (response[1] != 0x00)
throw new ConnectionException("Bad Usernaem/Password.");
}
// This version only supports connect command.
// UDP and Bind are not supported.

// Send connect request now...
nIndex = 0;
request[nIndex++]=0x05; // version 5.
request[nIndex++]=0x01; // command = connect.
request[nIndex++]=0x00; // Reserve = must be 0x00

if (destIP != null)
{// Destination adress in an IP.
switch(destIP.AddressFamily)
{
case AddressFamily.InterNetwork:
// Address is IPV4 format
request[nIndex++]=0x01;
rawBytes = destIP.GetAddressBytes();
rawBytes.CopyTo(request,nIndex);
nIndex+=(ushort)rawBytes.Length;
break;
case AddressFamily.InterNetworkV6:
// Address is IPV6 format
request[nIndex++]=0x04;
rawBytes = destIP.GetAddressBytes();
rawBytes.CopyTo(request,nIndex);
nIndex+=(ushort)rawBytes.Length;
break;
}
}
else
{// Dest. address is domain name.
request[nIndex++]=0x03; // Address is full-qualified domain name.
request[nIndex++]=Convert.ToByte(destAddress.Length); // length of address.
rawBytes = Encoding.Default.GetBytes(destAddress);
rawBytes.CopyTo(request,nIndex);
nIndex+=(ushort)rawBytes.Length;
}

// using big-edian byte order
byte[] portBytes = BitConverter.GetBytes(destPort);
for (int i=portBytes.Length-1;i>=0;i--)
request[nIndex++]=portBytes[i];

// send connect request.
s.Send(request,nIndex,SocketFlags.None);
s.Receive(response); // Get variable length response...
if (response[1]!=0x00)
throw new ConnectionException(errorMsgs[response[1]]);
// Success Connected...
return s;
}
}
}

Answer 2

我不会过，可以为你支招！
你出20分说不上就有人做！