/**********************************
 * Domain Scanner v2.0            *
 * by HoGs HeaD                   *
 * Fixed up the screwy stuff.     *
 * (C)1998 HoGs HeaD              *
 * You may not modify and         *
 * then redistribute              *
 * this source.                   *
 *********************************/

#include <stdio.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <netinet/in.h>
#include <errno.h>
#include <netdb.h>
#include <signal.h>

void brk(int no){
   printf("^C Interrupt!\n");
   exit(1);
}

void main(int argc, char **argv)
{
    struct hostent *host;                       /* init stuff */
    struct sockaddr_in sa;
    int net, error;
    int port=23, i, done=0;
    char *curr_ip, *del, *cm[100];
    int A1, A2, A3, A4;
    int B1, B2, B3, B4;
    int C1, C2, C3, C4;
   printf("\nDomain Scanner v2.0 by HoGs HeaD\nHit any key to end.\n");
   if(argc < 3){
        printf("Usage: domscan ip_begin ip_end port\nwhere ip_start equals the
beginning IP(ie 127.26.26.1)\nand ip_end equals the ending IP(ie 147.26.27.12)\
nand port is the port to check on\n\n");
        exit(0);
   }

   signal(SIGINT, brk);
      if(argv[3]==NULL){
   }else{
      port=atoi(argv[3]);
   }

   /* Parse in the first Ip.... */

   curr_ip=argv[1];
   del=(char *)strtok(curr_ip, ".");
   A1=atoi(del);
   del=(char *)strtok(NULL, ".");
   A2=atoi(del);
   del=(char *)strtok(NULL, ".");
   A3=atoi(del);
   del=(char *)strtok(NULL, ".");
   A4=atoi(del);

   /* Read in Second Ip... */
   curr_ip = argv[2];
   del=(char *)strtok(curr_ip, ".");
   B1=atoi(del);
   del=(char *)strtok(NULL, ".");
   B2=atoi(del);
   del=(char *)strtok(NULL, ".");
   B3=atoi(del);
   del=(char *)strtok(NULL, ".");
   B4=atoi(del);
   /* We're finished parsing, now onto the actual scan... */
   C1=A1;
   C2=A2; /* SaVe DeM VaLueS! */
   C3=A3;
   C4=A4;
for(A4=C4;A4<=B4; A4++){
for(A3=C3;A3<=B3; A3++){
for(A2=C2;A2<=C2; A2++){
for(A1=C1;A1<=B1; A1++){
   sprintf(curr_ip, "%d.%d.%d.%d", A1, A2, A3, A4);               /* build the
ip */
   if( ( fork() ) == 0){                                          /* fork a chi
ld */
   sa.sin_family = AF_INET;
   sa.sin_addr.s_addr = inet_addr(curr_ip);
   sa.sin_port = htons(port);                                     /* socket is
set and... */
   net = socket(AF_INET, SOCK_STREAM, 0);                         /* create socket */
   if(net < 2){ 
      exit(2);     
   }
   alarm(5);                                                      /* wait 5 sec
onds until we cancel connection */
   error = connect(net, (struct sockaddr *)&sa, sizeof sa);       /* attempt co
nnection */
   
   error < 0 ? printf("Error connecting to: %s %s\n", curr_ip, strerror(errno)) : printf("Connection success at: %s\n", curr_ip);
   shutdown(net, 2);                                                /* disconne
ct socket */
   exit(0);                                                         /* exit chi
ld process */
   }
   
 }
}
}
}
gets((char *)i);          /* Wait for enter to be pressed to exit */
}