strscan2b1.c

Scans a range of ips on a given port for (string). (In our honest opinion #1)

eZine lover (@eZine)

Published in 

In our honest opinion

 · 6 Mar 2024

/*                 ( IOHO 2001 #og irc.ndrsnet.com )                     */ 
/* strscan.c v2b1 by ka0z@ndrsnet for IOHO E-Zine http://chickenz.net/og */ 
/* Basically, I made this for myself and it was suggested that I put     */ 
/* this in the e-zine so I did. Any ideas on how to implement the        */ 
/* multiple line banner checking would be greatly appreciated.           */ 
/* this has been optimized with ntohl and htonl and shit like that blah  */ 
/* blah blah blah.....ok                                                 */ 

#include <stdio.h> 
#include <netdb.h> 
#include <arpa/inet.h> 
#include <string.h> 
#include <sys/types.h> 
#include <sys/socket.h> 
#include <netinet/in.h> 
#include <unistd.h> 

int usage(char *); 
int validip(char *); 

int main(int argc, char *argv[]){ 
  struct sockaddr_in sin; 
  struct in_addr addr; 
  unsigned long start,end; 
  long i; 
  int sock; 
  char buff[1024],*str,*check; 

  if(argc<5) 
    usage(argv[0]); 

  if(validip(argv[1]) || validip(argv[2])){ 
    printf("you stupid jew you dont even know what the hell an ip is do you?\n"); 
    exit(-1); 
  } 

  start=inet_addr(argv[1]); 
  end=inet_addr(argv[2]); 

  str=argv[4]; 

  for(i=ntohl(start);i<=ntohl(end);i++){ 
    if((i&0xff)==255) 
      i++; 
    if((i&0xff)==0) 
      i++; 

    addr.s_addr=htonl(i); 

    sin.sin_addr.s_addr=addr.s_addr; 
    sin.sin_port=htons(atoi(argv[3])); 
    sin.sin_family=AF_INET; 

    if((sock=socket(AF_INET,SOCK_STREAM,IPPROTO_TCP))<0){ 
      perror("socket"); 
      exit(-1); 
    } 

    if(connect(sock,(struct sockaddr *)&sin,sizeof(struct sockaddr_in))==-1) 
      goto err; 
    read(sock,buff,1024); 
    check=&buff[0]; 
    if(*check == '\n') 
      goto err; 
    if(strstr(buff,str)){ 
      printf("%s\n",inet_ntoa(addr)); 
      fflush(stdout); 
      break; 
    } 
err: 
    bzero((char *)&sin,sizeof(struct sockaddr_in)); 
    bzero(buff,sizeof(buff)); 
    close(sock); 
  } 
  exit(0); 
} 

int validip(char *ip){ /* props to mixter for this function :) */ 
  int a,b,c,d,*check; 
  sscanf(ip,"%d.%d.%d.%d",&a,&b,&c,&d); 
  check=&a; 
  if(*check<0) 
    return(-1); 
  if(*check>255) 
    return(-1); 
  check=&b; 
  if(*check<0) 
    return(-1); 
  if(*check>255) 
    return(-1); 
  check=&c; 
  if(*check<0) 
    return(-1); 
  if(*check>255) 
    return(-1); 
  check=&d; 
  if(*check<0) 
    return(-1); 
  if(*check>255) 
    return(-1); 
  return(0); 
} 

int usage(char *p){ 
  printf("strscan v2b1 by ka0z for IOHO\n" 
         "usage: %s <begin ip> <end ip> <port> <string>\n",p); 
  exit(-1); 
}