如何编写最简单的端口扫描程序：
一：新建一个支持MFC的WIN32控制台应用程序；
二：在 SCANPORT.CPP文件中，添加两个全局变量：
int i ;
CSocket sockClient;
再添加线程处理函数定义：
DWORD WINAPI ScanPorts(LPVOID);
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
代码如下：
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
// initialize MFC and print and error on failure
if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
{
// TODO: change error code to suit your needs
cerr << _T("Fatal Error: MFC initialization failed") << endl;
nRetCode = 1;
}
else
{
::SetConsoleTitle("Scan ports -- Written by CodeWorrior");
/////////////////////////////////////
//
// 扫描的主机，可以改为用户输入
//
//////////////////////////////////////
// TODO: code your application's behavior here.
AfxSocketInit(NULL);
for(i=1;i<=10;i++)
{
HANDLE hThread;
DWORD dwThreadID;
file://cout<<i<<endl;
hThread = CreateThread(NULL,0,ScanPorts,(LPVOID)i,0,&dwThreadID);
Sleep(1000);
::WaitForSingleObject(hThread,200);
CloseHandle(hThread);
}
}
cout<<endl;
return nRetCode;
}
DWORD WINAPI ScanPorts(LPVOID p)
{
try
{
int j = (i-1)*100;
printf("Thread %d starting\n",i);
for(j;j<i*100;j++)
{
sockClient.Create();
if(sockClient.Connect("10.128.0.3",1028))
{
cout<<endl;
cout<<"port"<<" "<<j<<" ";
cout<<"Connect to server succeed!"<<endl;;
sockClient.Close();
}
else
{
printf("port %d connect to server failed\n",j); //可以显示正在连接那个端口
sockClient.Close();
}
}
}
catch(...)
{
sockClient.Close();
}
printf("Thread %d Terminate!\n",i);
return 0;
}