dutmp.c

/*
 * public domain -- Dave 'Kill a Cop' Cinege <dcinege@psychosis.com>
 * 
 * dutmp
 * Takes utmp formated file on stdin and dumps it's contents 
 * out in colon delimited fields. Easy to 'cut' for shell based 
 * versions of 'who', 'last', etc. IP Addr is output in hex, 
 * little endian on x86.
 * 
 * made against libc6
 */

#include "internal.h"
#include <stdio.h>
#include <utmp.h>

static const char dutmp_usage[] = "dutmp\n"
    "\n"
    "\tDump file or stdin utmp file format to stdout, pipe delimited.\n"
    "\tdutmp /var/run/utmp\n";

extern int dutmp_main (int argc, char **argv)
{

    FILE *f = stdin;
    struct utmp ut;

    if ((argc < 2) || (**(argv + 1) == '-')) {
	usage( dutmp_usage);
    }

    if ( **(++argv) == 0 ) {
	f = fopen (*(++argv), "r");
	   if (f < 0 ) {
		perror (*argv);
		exit (FALSE);
	   }
    }

    while (fread (&ut, 1, sizeof (struct utmp), f)) {
	// printf("%d:%d:%s:%s:%s:%s:%d:%d:%ld:%ld:%ld:%x\n", 
	printf ("%d|%d|%s|%s|%s|%s|%d|%d|%ld|%ld|%ld|%x\n",
		ut.ut_type, ut.ut_pid, ut.ut_line,
		ut.ut_id, ut.ut_user, ut.ut_host,
		ut.ut_exit.e_termination, ut.ut_exit.e_exit,
		ut.ut_session,
		ut.ut_tv.tv_sec, ut.ut_tv.tv_usec, ut.ut_addr);
    }

    exit (TRUE);
}