黑客编程课程（十四）单线程TCP端口扫描器

黑客编程教程（十四）单线程TCP端口扫描器

						第十四节 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();

}