portscan.c

非常高效的扫描器

/* this has been tested already, it works...  
 *
 * feed the ascii ip address and port number, and return true
 * or false if the port is open or closed....
 *
*/

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

int portscan(char *ip, int port)
{
 int sockfd, test;
 struct sockaddr_in addr;

 sockfd=socket(AF_INET, SOCK_STREAM, 0); // fuck error checking

 addr.sin_port = htons(port);
 addr.sin_family = AF_INET;
 addr.sin_addr.s_addr = inet_addr(ip);

 test = connect_timeo(sockfd, (struct sockaddr *)&addr, sizeof(addr), 2);

 close(sockfd);
 if (test == -1)
	return (1 == 0); /* (false) */

  return (1 == 1);
}