c语言扫描器,LinuxC语言写的超级简单port扫描器

这个本来曾经也写过的&＃xff0c;今天无聊复习下 再写一遍。简单的一塌糊涂&＃xff0c;写的不咋地大家见谅哦&＃xff01;有空再加强 嘿嘿&＃xff01;

#include

#include

#include

#include

#include

#include

#include

void msg()

{

printf("EP:scan ip startport endport/nEP:scan ip 127.0.0.1 20 2009/n");

}

int main(int argc,char** argv)

{

char *ip;

int startport,endport,sockfd,i;

struct sockaddr_in to;

float costtime;

clock_t start,end;

if(4!&＃61;argc)

{

msg();

return 0;

}

ip&＃61;argv[1];

startport&＃61;atoi(argv[2]);

endport&＃61;atoi(argv[3]);

if(startport<1 || endport>65535 || endport

{

printf("port范围出错/n");

return 0;

}

else

printf("IP:%s %d-%d/n",ip,startport,endport);

to.sin_family&＃61;AF_INET;

to.sin_addr.s_addr&＃61;inet_addr(ip);

start&＃61;clock();

for(i&＃61;startport;i<&＃61;endport;i&＃43;&＃43;)

{

sockfd&＃61;socket(AF_INET,SOCK_STREAM,0);

to.sin_port&＃61;htons(i);

if(connect(sockfd,(struct sockaddr *)&to,sizeof(struct sockaddr))&＃61;&＃61;0)

{

printf("%s %d/n",ip,i);

close(to);

}

}

end&＃61;clock();

costtime&＃61;(float)(end-start)/CLOCKS_PER_SEC;

printf("用时:%f秒/n",costtime);

return 0;

}