/*
utxreader -- reads binary wtmpx-format files; prints attributes
Copyright (C) 1999 Ed Cashin

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/
/* utxreader
 * Ed Cashin, OIT, Sep. 1999
 *
 * reads wtmpx-format binary files and prints fields in
 * colon-delimited ASCII format.
 */

#include	<stdio.h>
#include	<stdlib.h>
#include	<time.h>
#include	<fcntl.h>
#include	<unistd.h>
#include	<utmpx.h>

#define		TIMEBUFSIZ	128

int main(int argc, char *argv[])
{
    struct utmpx	 utx;
    int			 fd;
    char		 timebuf[TIMEBUFSIZ];

    timebuf[TIMEBUFSIZ]	 = '\0';

    if (argc < 2) {
      fprintf(stderr, "usage: %s {filename}\n", argv[0]);
      exit(EXIT_FAILURE);
    }
    if ( (fd = open(argv[1], O_RDONLY)) == -1) {
      perror(argv[1]);
      exit(EXIT_FAILURE);
    }
    
    while (read(fd, &utx, sizeof(utx)) == sizeof(utx)) {
      strftime(timebuf, TIMEBUFSIZ - 1,
	       "%Y%m%d-%H%M%S", localtime(&utx.ut_tv.tv_sec));
      printf("user=%s:fmttime=%s:host=%s:"
	     "init_id=%s:device=%s:pid=%ld:proc_type=%d:"
	     "term_status=%d:exit_status=%d:"
	     "\n", 
	     utx.ut_user, timebuf, utx.ut_host,
	     utx.ut_id, utx.ut_line, utx.ut_pid, utx.ut_type, 
	     utx.ut_exit.e_termination, utx.ut_exit.e_exit);
    }
    
    return 0;
}
/*
  from utmpx.h or something:

          char     ut_user[32];           // user login name
          char     ut_id[4];              // /etc/inittab id
                                          // (usually line #)
          char     ut_line[32];           // device name (console, lnxx)
          pid_t    ut_pid;                // process id
          short    ut_type;               // type of entry
          struct   exit_status ut_exit;   // exit status of a process
                                          // marked as DEAD_PROCESS
          struct   timeval ut_tv;         // time entry was made
          long     ut_session;            // session ID, used for windowing
          long     pad[5];                // reserved for future use
          short    ut_syslen;             // significant length of ut_host
                                          // including terminating null
          char     ut_host[257];          // host name, if remote

     The structure exit status includes the following members:

          short   e_termination;   // termination status
          short   e_exit;          // exit status

from /usr/include/sys/time.h:

        struct timeval {
        	long    tv_sec;         // seconds
        	long    tv_usec;        // and microseconds
        };

*/