这几天做ASP.Net追捕，也算是我入门吧。思路很简单，主要就是识别远程主机传回的Banner，判断远程主机服务器。这可能不够准确，因为合格的管理员可能会去修改Banner。

代码如下（从我的Web追捕里找出来的，用VB.Net）

            Dim swWriter As StreamWriter
            '用以向网络基础数据流传送数据
            Dim nsStream As NetworkStream
            '创建发送数据的网络基础数据流
            Dim tcpClient2 As TcpClient
            '通过它实现向远程主机提出TCP连接申请
            Dim sHostName As String
            Dim srRead As StreamReader
            '从网络基础数据流中读取数据
            'HTTP服务追捕
            If TcpConnect(ZSIP, 80) = "CG" Then
                OppHTTP.Text = "HTTP服务已开启！服务软件类型：未知"
                Try
                    'tcpClient = New TcpClient(IPAddress, Port)
                    tcpClient2 = New TcpClient(ZSIP.ToString(), 80)
                    tcpClient2.ReceiveTimeout = 1000000
                    tcpClient2.SendTimeout = 1000000
                    '对远程主机的8000端口提出TCP连接申请
                    nsStream = tcpClient2.GetStream()
                    '通过申请，并获取传送数据的网络基础数据流
                    swWriter = New StreamWriter(nsStream)
                    swWriter.WriteLine("Get /index.htm HTTP/1.1")
                    swWriter.WriteLine("Host:" & IP.Text)
                    swWriter.WriteLine("Accept:*/*")
                    swWriter.WriteLine("Referer:")
                    swWriter.WriteLine()
                    '刷新当前数据流中的数据
                    swWriter.Flush()
                    srRead = New StreamReader(nsStream, Encoding.Default)
                    '以得到的网络基础数据流来初始化StreamReader实例
                    Dim L As Integer = 0
                    Do While Not srRead.Peek = -1 And L < 20
                        StrHttp = StrHttp & srRead.ReadLine()
                        L = L + 1
                    Loop
                  

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