输入主机IP或域名，输入开始结束端口。
原理
主要使用了ASP.NET 2.0的System.Net.Sockets组件。
StartPort = Convert.ToInt32(numStart.Text);
EndPort = Convert.ToInt32(numEnd.Text);
ipAdres = txtIP.Text;
Thread[] pool = new Thread[(EndPort - StartPort) + 1];
int i = 0;
DateTime start = DateTime.Now;
// Loop through the ports between start port and end port
for (int CurrPort = StartPort; CurrPort <= EndPort; CurrPort++)
{
Thread th =
new Thread(new System.Threading.ParameterizedThreadStart(portAc));
//NOTE: better to leave to system.
// th.Priority = ThreadPriority.AboveNormal;
th.Start(CurrPort);
pool[i] = th;
i++;
}
#region thread pool
int k = --i;
int retryCount = 0;
for (; i >= 0; i--)
{
if (pool[i].IsAlive)
{
i = k;
retryCount++;
continue;
}
if (retryCount == 1000)
{
break;
}
}
#endregion
#region httpfinger
if (http)
{
// Create a request for the URL.
WebRequest request = WebRequest.Create("http://" + txtIP.Text);
// If required by the server, set the credentials.
request.Credentials = CredentialCache.DefaultCredentials;
// Get the response.
try{
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
string serverType = response.Headers["server"];
if (serverType.Contains("IIS"))
{
lblServer.Text = "Windows System ";
if (serverType.Contains("5."))
{
lblServer.Text += "XP/2000";
}
if (serverType.Contains("6."))
{
lblServer.Text += "2003";
}
}
if (serverType.ToLower().Contains("apache"))
{
lblServer.Text += "probably linux";
}
lblServer.Text += "
" + serverType;
}
catch(Exception Err){
//sometime which returns 404 and it makes a problem.
}
}
#endregion
DateTime end = DateTime.Now;
TimeSpan sonuc = end - start;
lblzaman.Text = sonuc.TotalSeconds + " total secs";上面是主要的代码，当然我们需要使用线程了，否则，这么多端口的扫描是非常浪费时间的。
public void portAc(object portNoObj)
{
int portNo = (int)portNoObj;
TcpClient TcpScan = new TcpClient();
try
{
// Try to connect
TcpScan.Connect(ipAdres, portNo);
if (!TcpScan.Connected) return;
// If there's no exception, we can say the port is open
log += "Port " + portNo + " open\r\n";
//NOTE: We may include more finger tips to here
switch (portNo)
{
case 80: http = true; break;
}
try
{
DataRow dr = dt.NewRow();
dr[0] = "http://www.portsdb.org/bin/portsdb.cgi?portnumber=" +
portNo + "&protocol=ANY&String=";
dt.Rows.Add(dr);
} // Ends Try
catch (Exception Err)
{
throw Err;
}
}
catch
{
// An exception occured, thus the port is probably closed
}
}
TcpClient类提供了网络连接、发送和接收的功能，不过这里我们只是使用了它的连接方法。
From:http://zhidao.baidu.com/question/53537473.html?si=3
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