下面是UDP打洞程序包的源码：
//WellKnown公用库
using System;
using System.IO;
using System.Runtime.Serialization.Formatters.Binary;
using System.Net ;
using System.Net .Sockets ;
using System.Collections ;
namespace P2PWellKnown
{
/// <summary>
/// UDP用户登录事件委托
/// </summary>
/// <param name="sender">事件源对象</param>
/// <param name="e">事件实体</param>
public delegate void UdpUserLogInDelegate(object sender, UDPSockEventArgs e);
/// <summary>
/// 一般UDP消息事件委托
/// </summary>
/// <param name="sender">事件源对象</param>
/// <param name="e">事件实体</param>
public delegate void UdpMessageDelegate(object sender, UDPSockEventArgs e);
/// <summary>
/// 初始化一个新连接的事件委托
/// </summary>
/// <param name="sender">事件源对象</param>
/// <param name="e">事件实体</param>
public delegate void UdpNewConnectDelegate(object sender, UDPSockEventArgs e);
/// <summary>
/// P2P共享数据类
/// </summary>
public class P2PConsts
{
/// <summary>
/// UDP服务器监听端口
/// </summary>
public const int UDP_SRV_PORT = 2280;
/// <summary>
///TCP服务器监听端口
/// </summary>
public const int TCP_SRV_PORT =2000;
}
/// <summary>
/// FormatterHelper 序列化，反序列化消息的帮助类
/// </summary>
public class FormatterHelper
{
public static byte[] Serialize(object obj)
{
BinaryFormatter binaryF = new BinaryFormatter();
MemoryStream ms = new MemoryStream(1024*10);
binaryF.Serialize(ms, obj);
ms.Seek(0, SeekOrigin.Begin);
byte[] buffer = new byte[(int)ms.Length];
ms.Read(buffer, 0, buffer.Length);
ms.Close();
return buffer;
}
public static object Deserialize(byte[] buffer)
{
BinaryFormatter binaryF = new BinaryFormatter();
MemoryStream ms = new MemoryStream(buffer, 0, buffer.Length, false);
object obj = binaryF.Deserialize(ms);
ms.Close();
return obj;
}
}
/// <summary>
/// 用于承载UDPSock信息的事件类
/// </summary>
public class UDPSockEventArgs:EventArgs
{
/// <summary>
/// 要承载的消息
/// </summary>
private string m_strMsg;
/// <summary>
/// 用户信息
/// </summary>
private string m_strUserName;
/// <summary>
/// 触发该事件的公共终端
/// </summary>
private IPEndPoint m_EndPoint;
/// <summary>
/// 初始化UDPSock事件
/// </summary>
/// <param name="sMsg">用户发送的信息</param>
public UDPSockEventArgs(string sMsg):base()
{
this.m_strMsg =sMsg;
}
/// <summary>
/// 远端用户名
/// </summary>
public string RemoteUserName
{
get
{
return m_strUserName;
}
set
{
m_strUserName=value;
}
}
/// <summary>
/// 一般套接字消息
/// </summary>
public string SockMessage
{
get
{
return m_strMsg;
}
set
{
m_strMsg = value;
}
}
/// <summary>
/// 公共远端节点
/// </summary>
public IPEndPoint RemoteEndPoint
{
get
{
return m_EndPoint;
}
set
{
m_EndPoint = value;
}
}
}
}
//UDPP2PSock.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Threading;
using P2PWellKnown;
namespace UDPP2P
{
/// <summary>
/// UDPP2P套接字管理类
/// </summary>
public class UDPP2PSock
{
/// <summary>
/// 用户登录事件
/// </summary>
public event UdpUserLogInDelegate OnUserLogInU;
/// <summary>
/// 一般UDP消息事件
/// </summary>
public event UdpMessageDelegate OnSockMessageU;
/// <summary>
/// 初始化一个新连接事件
/// </summary>
public event UdpNewConnectDelegate OnNewConnectU;
/// <summary>
/// UDP服务器
/// </summary>
private UdpClient m_udpServer;
/// <summary>
/// UDP客户端
/// </summary>
private UdpClient m_udpClient;
/// <summary>
/// 服务器实际上在本地机器上监听的
/// 端口，用于当一台计算机上同时启
/// 动两个可两以上服务器进程时，标
/// 识不同的服务器进程
/// </summary>
private int m_iMyServerPort;
/// <summary>
/// 客户端在本地机器上实际使用的端口，
/// 用于当一台计算机上同时有两个或两
/// 个以上客户端进程在运行时，标识不
/// 同的客户端进程
/// </summary>
private int m_iMyClientPort;
/// <summary>
/// 标识是否已成功创服务器
/// </summary>
private bool m_bServerCreated;
/// <summary>
/// 标识是否已成功创建客户端
/// </summary>
private bool m_bClientCreated;
/// <summary>
/// 服务器使用的线程
/// </summary>
private Thread m_serverThread;
/// <summary>
/// 客户端使用的线程
/// </summary>
private Thread m_clientThread;
/// <summary>
/// 打洞线程
/// </summary>
//private Thread m_burrowThread;
/// <summary>
/// 远端节点
/// </summary>
private IPEndPoint m_remotePoint;
/// <summary>
/// 当前进程作为客户端的公共终端
/// </summary>
private string m_strMyPublicEndPoint;
/// <summary>
/// 当前进程作为客户端的私有终端
/// </summary>
private string m_strMyPrivateEndPoint;
/// <summary>
/// 用于接受信息的StringBuilder实例
/// </summary>
private StringBuilder m_sbResponse = new StringBuilder();
/// <summary>
/// P2P打洞时标识是否收到回应消息
/// </summary>
private bool m_bRecvAck=false ;
/// <summary>
/// 请求向其方向打洞的私有终端
/// </summary>
private IPEndPoint m_requestPrivateEndPoint;
/// <summary>
/// 请求向其方向打洞的公共终端
/// </summary>
private IPEndPoint m_requestPublicEndPoint;
/// <summary>
/// 打洞消息要发向的节点
/// </summary>
private ToEndPoint m_toEndPoint;
/// <summary>
/// 用于标识是否已经和请求客户端建立点对连接
/// </summary>
//private bool m_bHasConnected=false ;
/// <summary>
/// 创建服务器或客户端的最大尝试
/// 次数，为（65536-60000），防止
/// 因不能创建而限入死循环或使用
/// 无效端口
/// </summary>
private const int MAX_CREATE_TRY = 5536;
/// <summary>
/// 打洞时尝试连接的最大尝试次数
/// </summary>
private const int MAX_CONNECT_TRY = 10;
/// <summary>
/// 构造函数，初始化UDPP2P实例
/// </summary>
public UDPP2PSock()
{
m_iMyServerPort = P2PConsts.UDP_SRV_PORT;
m_iMyClientPort = 60000;
m_bClientCreated = false;
m_bServerCreated = false;
m_toEndPoint = new ToEndPoint();
m_serverThread = new Thread(new ThreadStart(RunUDPServer ));
m_clientThread = new Thread(new ThreadStart(RunUDPClient ));
//m_burrowThread = new Thread(new ThreadStart(BurrowProc));
}
/// <summary>
/// 创建UDP服务器
/// </summary>
public void CreateUDPSever()
{
int iTryNum=0;
//开始尝试创建服务器
while (!m_bServerCreated && iTryNum < MAX_CREATE_TRY)
{
try
{
m_udpServer = new UdpClient(m_iMyServerPort);
m_bServerCreated = true;
}
catch
{
m_iMyServerPort++;
iTryNum++;
}
}
//创建失败，抛出异常
if (!m_bServerCreated && iTryNum == MAX_CREATE_TRY)
{
throw new Exception ("创建服务器尝试失败！");
}
m_serverThread.Start();
}
/// <summary>
/// 创建UDP客户端
/// </summary>
/// <param name="strServerIP">服务器IP</param>
/// <param name="iServerPort">服务器端口</param>
public void CreateUDPClient(string strServerIP,int iServerPort)
{
int iTryNum = 0;
//开始尝试创建服务器
while (!m_bClientCreated && iTryNum < MAX_CREATE_TRY)
{
try
{
m_udpClient = new UdpClient(m_iMyClientPort );
m_bClientCreated = true;
string strIPAddress = (System.Net.Dns.GetHostAddresses("localhost")[0]). ToString();
m_strMyPrivateEndPoint = strIPAddress + ":" + m_iMyClientPort.ToString();
}
catch
{
m_iMyClientPort ++;
iTryNum++;
}
}
//创建失败，抛出异常
if (!m_bClientCreated && iTryNum == MAX_CREATE_TRY)
{
throw new Exception ("创建客户端尝试失败！");
}
IPEndPoint hostPoint = new IPEndPoint(IPAddress.Parse(strServerIP), iServerPort);
string strLocalIP = (System.Net.Dns.GetHostAddresses("localhost"))[0].ToString();
SendLocalPoint(strLocalIP, m_iMyClientPort, hostPoint);
m_clientThread .Start();
}
/// <summary>
/// 运行UDP服务器
/// </summary>
private void RunUDPServer()
{
while (true)
{
byte[] msgBuffer =m_udpServer .Receive(ref m_remotePoint);
m_sbResponse.Append(System.Text.Encoding. Default.GetString(msgBuffer));
CheckCommand();
Thread.Sleep(10);
}
}
/// <summary>
/// 运行UDP客户端
/// </summary>
private void RunUDPClient()
{
while (true)
{
byte[] msgBuffer = m_udpClient.Receive(ref m_remotePoint);
m_sbResponse.Append(System.Text.Encoding. Default.GetString(msgBuffer));
CheckCommand();
Thread.Sleep(10);
}
}
/// <summary>
/// 销毁UDP服务器
/// </summary>
public void DisposeUDPServer()
{
m_serverThread.Abort();
m_udpServer.Close();
}
/// <summary>
/// 销毁UDP客房端
/// </summary>
public void DisposeUDPClient()
{
m_clientThread.Abort();
m_udpClient.Close();
}
/// <summary>
/// 发送消息
/// </summary>
/// <param name="strMsg">消息内容</param>
/// <param name="REP">接收节点</param>
public void SendData(string strMsg,IPEndPoint REP)
{
byte[] byMsg = System.Text.Encoding.Default.GetBytes(strMsg.ToCharArray());
m_udpClient.Send(byMsg, byMsg.Length, REP);
}
/// <summary>
/// 发送消息，服务器专用
/// </summary>
/// <param name="strMsg">消息内容</param>
/// <param name="REP">接收节点</param>
private void ServerSendData(string strMsg,IPEndPoint REP)
{
byte[] byMsg = System.Text.Encoding.Default.GetBytes(strMsg.ToCharArray());
m_udpServer.Send(byMsg, byMsg.Length, REP);
}
/// <summary>
/// 发送本地节点信息
/// </summary>
/// <param name="strLocalIP">本地IP</param>
/// <param name="iLocalPort">本地端口</param>
public void SendLocalPoint(string strLocalIP, int iLocalPort,IPEndPoint REP)
{
string strLocalPoint = "\x01\x02" + strLocalIP + ":" + iLocalPort.ToString() + "\x02\x01";
SendData(strLocalPoint, REP);
}
/// <summary>
/// 同时向指定的终端（包括公共终端和私有终端）打洞
/// </summary>
/// <param name="pubEndPoint">公共终端</param>
/// <param name="prEndPoint">私有终端</param>
/// <returns>打洞成功返回true,否则返回false</returns>
public void StartBurrowTo(IPEndPoint pubEndPoint, IPEndPoint prEndPoint)
{
Thread burrowThread = new Thread(new ThreadStart(BurrowProc));
m_toEndPoint.m_privateEndPoint = prEndPoint;
m_toEndPoint.m_publicEndPoint = pubEndPoint;
burrowThread.Start();
}
/// <summary>
/// 打洞线程
/// </summary>
private void BurrowProc()
{
IPEndPoint prEndPoint = m_toEndPoint.m_privateEndPoint;
IPEndPoint pubEndPoint = m_toEndPoint.m_publicEndPoint;
int j = 0;
for (int i = 0; i < MAX_CONNECT_TRY; i++)
{
SendData("\x01\x07\x07\x01", prEndPoint);
SendData("\x01\x07\x07\x01", pubEndPoint);
//等待接收线程标记修改
for (j = 0; j < MAX_CONNECT_TRY; j++)
{
if (m_bRecvAck)
{
m_bRecvAck = false;
SendData("\x01\x07\x07\x01", prEndPoint);
Thread.Sleep(50);
SendData("\x01\x07\x07\x01", pubEndPoint);
UDPSockEventArgs args = new UDPSockEventArgs("");
args.RemoteEndPoint = pubEndPoint;
if (OnNewConnectU != null)
{
OnNewConnectU(this, args);
}
//Thread .Sleep (System .Threading.Timeout .Infinite );
return;
}
else
{
Thread.Sleep(100);
}
}
//如果没有收到目标主机的回应，表明本次打
//洞尝试失败,等待100毫秒后尝试下一次打洞
Thread.Sleep(100);
}
//MAX_CONNECT_TRY尝试都失败，表明打洞失败，抛出异常
//throw new Exception("打洞失败！");
System.Windows.Forms.MessageBox.Show("打洞失败！");////////////
}
/// <summary>
/// 转发打洞请求消息，在服务器端使用
/// </summary>
/// <param name="strSrcPrEndpoint">请求转发的源私有终端</param>
/// <param name="strSrcPubEndPoint">请求转发的源公共终端</param>
/// <param name="REP">转发消息到达的目的终端</param>
public void SendBurrowRequest(string strSrcPrEndpoint, string strSrcPubEndPoint,IPEndPoint REP)
{
string strBurrowMsg = "\x04\x07" + strSrcPrEndpoint + " " + strSrcPubEndPoint + "\x07\x04";
ServerSendData(strBurrowMsg, REP);
}
/// <summary>
/// 检查字符串中的命令
/// </summary>
private void CheckCommand()
{
int nPos;
string strCmd = m_sbResponse.ToString();
//如果接收远端用户名
if ((nPos = strCmd.IndexOf("\x01\x02")) > -1)
{
ReceiveName(strCmd, nPos);
//反馈公共终给端远端主机
string strPubEPMsg = "\x03\x07" + m_remotePoint.ToString() + "\x07\x03";
SendData(strPubEPMsg, m_remotePoint);
return;
}
//如果接收我的公共终端
if ((nPos = strCmd.IndexOf("\x03\x07")) > -1)
{
ReceiveMyPublicEndPoint(strCmd, nPos);
return;
}
//如果是打洞请求消息
if ((nPos = strCmd.IndexOf("\x04\x07")) > -1)
{
ReceiveAndSendAck(strCmd, nPos);
return;
}
//如果是打洞回应消息
if ((nPos =strCmd .IndexOf ("\x01\x07"))>-1)
{
m_bRecvAck = true;
int nPos2 = strCmd.IndexOf("\x07\x01");
if (nPos2 > -1)
{
m_sbResponse.Remove(nPos, nPos2 - nPos + 2);
}
/*
if (m_requestPublicEndPoint != null)
{
if (!m_bHasConnected)
{
m_bHasConnected = true;
UDPSockEventArgs args = new UDPSockEventArgs("");
args.RemoteEndPoint = m_requestPublicEndPoint;
if (OnNewConnectU != null)
{
OnNewConnectU(this, args);
}
m_requestPublicEndPoint = null;
}
}*/
return;
}
//一般聊天消息
m_sbResponse.Remove(0, strCmd.Length);
RaiseMessageEvent(strCmd);
}
/// <summary>
/// 接收远端用户名
/// </summary>
/// <param name="strCmd">包含用户名的控制信息</param>
/// <param name="nPos"></param>
private void ReceiveName(string strCmd, int nPos)
{
int nPos2 = strCmd.IndexOf("\x02\x01");
if (nPos2 == -1)
{
return;
}
m_sbResponse.Remove(nPos, nPos2 - nPos + 2);
string strUserName = strCmd.Substring(nPos + 2, nPos2 - nPos - 2);
UDPSockEventArgs e = new UDPSockEventArgs("");
e.RemoteUserName = strUserName;
e.RemoteEndPoint = m_remotePoint;
//触发用户登录事件
if (OnUserLogInU != null)
{
OnUserLogInU(this, e);
}
}
/// <summary>
/// 接收打洞请求的消息并发送回应
/// </summary>
/// <param name="strCmd"></param>
/// <param name="nPos"></param>
private void ReceiveAndSendAck(string strCmd, int nPos)
{
int nPos2 = strCmd.IndexOf("\x07\x04");
if (nPos2 == -1)
{
return;
}
m_sbResponse.Remove(nPos, nPos2 - nPos + 2);
string strBurrowMsg = strCmd.Substring(nPos + 2, nPos2 - nPos - 2);
string[] strSrcPoint = strBurrowMsg.Split(' ');
//分析控制字符串包含的节点信息
string[] strPrEndPoint = strSrcPoint[0].Split(':');
string[] strPubEndPoint = strSrcPoint[1].Split(':');
m_requestPrivateEndPoint= new IPEndPoint(IPAddress.Parse(strPrEndPoint[0]), int.Parse(strPrEndPoint[1]));
m_requestPublicEndPoint = new IPEndPoint(IPAddress.Parse(strPubEndPoint[0]), int.Parse(strPubEndPoint[1]));
//向请求打洞终端的方向打洞
StartBurrowTo(m_requestPublicEndPoint, m_requestPrivateEndPoint);
}
/// <summary>
/// 接收我的公共终端
/// </summary>
/// <param name="strCmd">包含公共终端的控制信息</param>
/// <param name="nPos">控制字符串的起始位置</param>
private void ReceiveMyPublicEndPoint(string strCmd, int nPos)
{
int nPos2 = strCmd.IndexOf("\x07\x03");
if (nPos2 == -1)
{
return;
}
m_sbResponse.Remove(nPos, nPos2 - nPos + 2);
m_strMyPublicEndPoint=strCmd.Substring(nPos + 2, nPos2 - nPos - 2);
}
/// <summary>
/// 触发一般UDP消息事件
/// </summary>
/// <param name="strMsg">消息内容</param>
private void RaiseMessageEvent(string strMsg)
{
UDPSockEventArgs args = new UDPSockEventArgs("");
args.SockMessage = strMsg;
args.RemoteEndPoint = m_remotePoint;
if (OnSockMessageU != null)
{
OnSockMessageU(this, args);
}
}
/// <summary>
/// 获取当前进程作为客户端的公共终端
/// </summary>
public string MyPublicEndPoint
{
get
{
return m_strMyPublicEndPoint;
}
}
/// <summary>
/// 获取当前进程作为客户端的私有终端
/// </summary>
public string MyPrivateEndPoint
{
get
{
return m_strMyPrivateEndPoint;
}
}
}
/// <summary>
/// 保存打洞消息要发向的节点信息
/// </summary>
class ToEndPoint
{
/// <summary>
/// 私有节点
/// </summary>
public IPEndPoint m_privateEndPoint;
/// <summary>
/// 公共节点
/// </summary>
public IPEndPoint m_publicEndPoint;
}
}
关于如何使用上述程序包的一些说明：
主要程序的初始化，参考代码如下：
//创建UDP服务器和客户端
try
{
string strServerIP="127.0.0.1"
udpSock = new UDPP2PSock();
udpSock.OnUserLogInU += new UdpUserLogInDelegate(OnUserLogInU);
udpSock.OnNewConnectU += new UdpNewConnectDelegate(OnNewConnectU);
udpSock.CreateUDPSever();
udpSock.CreateUDPClient(strServerIP, P2PConsts.UDP_SRV_PORT);
}
catch (Exception ex)
{
}