getports.c

非常高效的扫描器

// not done yet, not used.

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


int getports(char *ip, struct portscan_ *ports)
{
  struct sockaddr_in addr[ports->numports];


  // set up sockets and address struct's for each port to scan.




  // remember to add the new structure members in multiscan.c

  int sockets[ports->numports], count;
  for(count = ports->numports; count > 0; count--)
  {
     sockets[count] = socket(AF_INET, SOCK_STREAM, 0);
     addr[count].sin_family = AF_INET;
     addr[count].sin_port = htons(ports.ports[count]);
     addr[count].sin_addr = inet_addr(ip);
  }













connect_nonb(int sockfd, struct sockaddr *saptr, int salen, 
int nsec)
{
 int flags, n, error;
 int len;
 fd_set rset, wset;
 struct timeval tval;

 flags = fcntl(sockfd, F_GETFL, 0);
 fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);

 error = 0;
 if ( (n = connect(sockfd, (struct sockaddr *)saptr, salen)) < 0)
       if (errno != EINPROGRESS)
        return( -1 );
 
  if ( n == 0 )
    goto done;

 FD_ZERO(&rset);
 FD_SET(sockfd, &rset);
 wset = rset;
 tval.tv_sex = nsec;
 tval.tv_usec = 0;

 if ( (n = select(sockfd + 1, &rset, 
	&wset, NULL, nsec ? &tval : NULL)) == 0) {
    close(sockfd);
    errno = ETIMEDOUT;
    return (-1);
   }
   if ( FD_ISSET(sockfd, &rset) || FD_ISSET(sockfd, &wset)) {
     len = sizeof(error);
     if(getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &error, &len) < 0)
        return ( -1 );
   } else printf(" select error: sockfd not set\n");
  done:
   fcntl(sockfd, F_SETFL, flags);
 
   if( error ) {
      close(sockfd);
      errno = error;
      return ( -1 );
   }
   return(0);
}