/* $Id: smskey.c,v 1.6 1998-02-15 17:49:29 danw Exp $
 *
 * Copyright (C) 1988-1998 by the Massachusetts Institute of Technology.
 * For copying and distribution information, please see the file
 * <mit-copyright.h>.
 */

#include <mit-copyright.h>
#include <moira.h>

#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include <des.h>

RCSID("$Header: /afs/athena.mit.edu/astaff/project/moiradev/repository/moira/update/smskey.c,v 1.6 1998-02-15 17:49:29 danw Exp $");

int debug = 0;			/* goddamn des library breakage */
char string[] = "sms\0\0Athena\0\1";
char srvtab[] = "/etc/srvtab";
char insecure[] =
    "\7\7\7This program MUST be run on the console, for security reasons.\n";

int main(int argc, char **argv)
{
  int fd;
  des_cblock key;
  char *tty;
  tty = ttyname(0);
  if (!tty || strcmp(tty, "/dev/console"))
    {
      fprintf(stderr, insecure);
      exit(1);
    }
  fd = open(srvtab, O_WRONLY|O_APPEND, 0);
  if (!fd)
    {
      perror(srvtab);
      exit(1);
    }
  if (sizeof(string) - 1 != 13)
    {
      fprintf(stderr, "string size bad\n");
      exit(1);
    }
  des_read_password(key, "Enter SMS update password: ", 0);
  write(fd, string, sizeof(string) - 1);
  write(fd, key, sizeof(C_Block));
  if (fsync(fd))
    perror(srvtab);
  close(fd);
  printf("\nKey written.\n");
  exit(0);
}