帮朋友问，一个很小的程序

winewinder 2003-09-15 09:05:05

通过向服务器的udp1434端口发送一个内容为02的一个字节的数据包，服务器如果安装了mssql服务的话就会返回mssql的信息。
我写了这样个扫描一个c类网络的小东西，编译通过，但是运行不对，请大家帮忙！
运行的时候是这样的：
C:\>sqlscan 211.92.45
start scaning,please wait...
start sending Udp packet to 211.92.45.1...
mssql server is not installed on 211.92.45.1

start sending Udp packet to 211.92.45.2...
^C
C:\>
第一个ip地址扫描正常，但是扫描第二个就死掉了一样~~~
不知道为什么

代码如下：
//利用udp1434端口探测mssql服务
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
public class sqlscan
{
private static UdpClient myclient;
public static void Main(string[] args)
{
if(args.Length==0)
{
Console.WriteLine("######################################################");
Console.WriteLine("scan mssql server by udp 1434 port");
Console.WriteLine("Thanks awen who come from patching.net");
Console.WriteLine("Usage:sqlscan IP");
Console.WriteLine("Example:sqlscan 192.168.0");
Console.WriteLine("######################################################");
}
else
{
Console.WriteLine("start scaning,please wait...");
//生成c类地址
string ip = args[0];
for(int i = 1;i<=254;i++)
{
ip = args[0]+"."+i.ToString();
IPAddress host = IPAddress.Parse(ip);
IPEndPoint point;
myclient = new UdpClient();
byte[] buffer = {02};
Console.WriteLine("start sending Udp packet to "+ip+"...");
try
{
point = new IPEndPoint(host,1434);
//发送数据包
int re = myclient.Send(buffer,1,point);
byte [] data = myclient.Receive(ref point);
if(data.Length<=0)
{
Console.WriteLine("faild to send udp packet to"+ip+"...");
}
else
{
Console.WriteLine("send udp packet to "+ip+"sucess...");
//接受返回信息
String strdata = Encoding.ASCII.GetString(data);
Console.Write(strdata);
myclient.Close();
}
}
catch
{
//捕获异常
Console.WriteLine("mssql server is not installed on "+ip+"\n");
//break;
}
}
}
}
}

...全文