黑客编程教程（十四）单线程TCP端口扫描器

#include<winsock2.h> 
#include<stdio.h>

#include <time.h>                           //计时需要用到的头文件

#pragma comment(lib,"ws2_32.lib")

 

#include <time.h> //计时需要用到的头文件

clock_t start,end; //程序运行的起始和结束时间

float costtime; //程序耗时

void usage(void)

{

printf("\tusage: tcpscan RemoteIP StartPort-EndPort\n");

printf("\tExample: tcpscan 192.168.1.1 80-100\n");

}

 

int main(int argc,char **argv)

{

char *host;

int startport,endport;

     char *p;

if(argc!=3)

{

usage();

return 0;

}

 

p=argv[2]; //处理端口参数

     if(strstr(argv[2],"-"))

     {    

startport=atoi(argv[2]);

         for(;*p;)

             if(*(p++)=='-')break;

         endport=atoi(p);

        

         if(startport<1 || endport>65535)

         {    

printf("Port Error!\n");

             return 0;

         }

 

     }

 

 

host=argv[1];

 

     WSADATA ws;

SOCKET s;

struct sockaddr_in addr;

int result;

long lresult;

 

lresult=WSAStartup(MAKEWORD(1,1), &ws);

 

addr.sin_family =AF_INET;

addr.sin_addr.s_addr =inet_addr(host);

 

     start=clock(); //开始计时

 

for (int i=startport;i<endport;i++)

{

s=socket(AF_INET, SOCK_STREAM, 0);

         addr.sin_port = htons(i);

if(s==INVALID_SOCKET)break;

result=connect(s, (struct sockaddr*)&addr,sizeof(addr)); 

if(result==0)

{

printf("%s %d\n",host,i);

closesocket(s);

 

}

 

}

end=clock(); //计时结束

costtime= (float)(end - start) / CLOCKS_PER_SEC;   //转换时间格式

printf("Cost time:%f second",costtime); //显示耗时

WSACleanup();

 

}