Logo Search packages:      
Sourcecode: shadow version File versions

lastlog.c

/*
 * Copyright 1989 - 1994, Julianne Frances Haugh
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of Julianne F. Haugh nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <config.h>

#include "rcsid.h"
RCSID (PKG_VER "$Id: lastlog.c 20 2005-04-13 18:07:09Z nekral-guest $")
#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <pwd.h>
#include <time.h>
#include "prototypes.h"
#include "defines.h"
#if HAVE_LASTLOG_H
#include <lastlog.h>
#else
#include "lastlog_.h"
#endif
/*
 * Needed for MkLinux DR1/2/2.1 - J.
 */
#ifndef LASTLOG_FILE
#define LASTLOG_FILE "/var/log/lastlog"
#endif
static FILE *lastlogfile;     /* lastlog file stream */
static off_t user;            /* one single user, specified on command line */
static int days;        /* number of days to consider for print command */
static time_t seconds;        /* that number of days in seconds */

static int uflg = 0;          /* set if user is a valid user id */
static int tflg = 0;          /* print is restricted to most recent days */
static struct lastlog lastlog;      /* scratch structure to play with ... */
static struct stat statbuf;   /* fstat buffer for file size */
static struct passwd *pwent;

#include <getopt.h>
static struct option const longopts[] = {
      {"user", required_argument, 0, 'u'},
      {"time", required_argument, 0, 't'},
      {"help", no_argument, 0, 'h'},
      {0, 0, 0, 0}
};

#define     NOW   (time ((time_t *) 0))

/* local function prototypes */
static void print (void);
static void print_one (const struct passwd *);

int main (int argc, char **argv)
{
      int c;

      setlocale (LC_ALL, "");
      bindtextdomain (PACKAGE, LOCALEDIR);
      textdomain (PACKAGE);

      if ((lastlogfile = fopen (LASTLOG_FILE, "r")) == (FILE *) 0) {
            perror (LASTLOG_FILE);
            exit (1);
      }
      while ((c =
            getopt_long (argc, argv, "u:t:h", longopts, NULL)) != -1) {
            switch (c) {
            case 'u':
                  pwent = getpwnam (optarg);
                  if (!pwent) {
                        fprintf (stderr,
                               _("Unknown User: %s\n"), optarg);
                        exit (1);
                  }
                  uflg++;
                  user = pwent->pw_uid;
                  break;
            case 't':
                  days = atoi (optarg);
                  seconds = days * DAY;
                  tflg++;
                  break;
            case 'h':
                  fprintf (stdout,
                         _
                         ("Usage: %s [<-u|--login> login-name] [<-t|--time> days] [<-h|--help>]\n"),
                         argv[0]);
                  exit (0);
            default:
                  fprintf (stdout,
                         _
                         ("Usage: %s [<-u|--login> login-name] [<-t|--time> days] [<-h|--help>]\n"),
                         argv[0]);
                  exit (1);
            }
      }
      print ();
      fclose (lastlogfile);
      exit (0);
 /*NOTREACHED*/}

static void print (void)
{
      off_t offset;

      if (uflg) {
            offset = (unsigned long) user *sizeof lastlog;

            if (fstat (fileno (lastlogfile), &statbuf)) {
                  perror (LASTLOG_FILE);
                  return;
            }
            if (offset >= statbuf.st_size)
                  return;

            fseek (lastlogfile, offset, SEEK_SET);
            if (fread ((char *) &lastlog, sizeof lastlog, 1,
                     lastlogfile) == 1)
                  print_one (pwent);
            else
                  perror (LASTLOG_FILE);
      } else {
            setpwent ();
            while ((pwent = getpwent ())) {
                  user = pwent->pw_uid;
                  offset = (unsigned long) user *sizeof lastlog;

                  fseek (lastlogfile, offset, SEEK_SET);
                  if (fread ((char *) &lastlog, sizeof lastlog, 1,
                           lastlogfile) != 1)
                        continue;

                  if (tflg && NOW - lastlog.ll_time > seconds)
                        continue;

                  print_one (pwent);
            }
      }
}

static void print_one (const struct passwd *pw)
{
      static int once;
      char *cp;
      struct tm *tm;

#ifdef HAVE_STRFTIME
      char ptime[80];
#endif

      if (!pw)
            return;

      if (!once) {
#ifdef HAVE_LL_HOST
            printf (_
                  ("Username         Port     From             Latest\n"));
#else
            printf (_("Username                Port     Latest\n"));
#endif
            once++;
      }
      /* don't assume lastlog.ll_time is a time_t */
      {
          time_t when;

          when = lastlog.ll_time;
          tm = localtime (&when);
      }
#ifdef HAVE_STRFTIME
      strftime (ptime, sizeof (ptime), "%a %b %e %H:%M:%S %z %Y", tm);
      cp = ptime;
#else
      cp = asctime (tm);
      cp[24] = '\0';
#endif

      if (lastlog.ll_time == 0)
            cp = _("**Never logged in**\0");

#ifdef HAVE_LL_HOST
      printf ("%-16s %-8.8s %-16.16s %s\n", pw->pw_name,
            lastlog.ll_line, lastlog.ll_host, cp);
#else
      printf ("%-16s\t%-8.8s %s\n", pw->pw_name, lastlog.ll_line, cp);
#endif
}

Generated by  Doxygen 1.6.0   Back to index