端口扫描工具codenomicon_端口扫描程序扫描按钮代码

如何用C++编写简易端口扫描器（要详细步骤）

#includewinsock2.h

#includestdio.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;//程序运行稿轮携的起始和结束时间键伏

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(startport1 || endport65535)

{ 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;iendport;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();//计时桐绝结束

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

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

WSACleanup();

}