c++ 端口扫描程序实现案例

// PortScanf.cpp : 定义控制台应用程序的入口点。
//
#define WIN32_LEAN_AND_MEAN
#include "stdafx.h"
#include <WinSock2.h>
#pragma comment(lib, "Ws2_32")
int scant(char *Ip, int StartPort, int EndPort)
{ 
  WSADATA wsa;
  SOCKET s;
  struct sockaddr_in server;
 
  int CurrPort;  //当前端口
  int ret;
 
  WSAStartup(MAKEWORD(2, 2), &wsa);  //使用winsock函数之前，必须用WSAStartup函数来装入并初始化动态连接库
 
  server.sin_family = AF_INET;  //指定地址格式，在winsock中只能使用AF_INET
  server.sin_addr.s_addr = inet_addr(Ip); //指定被扫描的IP地址
 
  for (CurrPort = StartPort; CurrPort <= EndPort; CurrPort++)
  {
    s = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
    server.sin_port = htons(CurrPort); //指定被扫描IP地址的端口号
    ret = connect(s, (struct sockaddr *)&server, sizeof(server)); //连接
 
    if (0 == ret) //判断连接是否成功
    {
      printf("%s:%d Success O(∩_∩)O~~\n", Ip, CurrPort);
      closesocket(s);
    }
    else {
      printf("%s:%d Failed\n", Ip, CurrPort);
    }
  } 
  printf("Cost time:%f second\n", CostTime); //输出扫描过程中耗费的时间
  WSACleanup();  //释放动态连接库并释放被创建的套接字
  return 1;
}
 
int main()
{
  scant("127.0.0.1", 75, 100);
   
  return 0;
}

typedef struct _tagValue
{
  int start;
  int end;
}PortNums;
 
void _cdecl beginThreadFunc1(LPVOID lpParam) {
  PortNums *pnInt = (PortNums*)lpParam;
  scan("127.0.0.1", pnInt->start, pnInt->end);
}
 
int a()
{
  PortNums m1;
  m1.start = 70;
  m1.end = 500;
 
  PortNums m2;
  m2.start = 501;
  m2.end = 1000;
 
  _beginthread(beginThreadFunc1, 0, &m1);
  _beginthread(beginThreadFunc1, 0, &m2);
 
 
  getchar();
  return 0;
}