usr.sbin/lastlogin/lastlogin.c

   1 /*
   2  * Copyright (c) 1996 John M. Vinopal
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed for the NetBSD Project
  16  *      by John M. Vinopal.
  17  * 4. The name of the author may not be used to endorse or promote products
  18  *    derived from this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  21  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  22  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  23  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  25  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  27  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * $NetBSD: lastlogin.c,v 1.4 1998/02/03 04:45:35 perry Exp $
  33  * $FreeBSD: src/usr.sbin/lastlogin/lastlogin.c,v 1.2.2.2 2001/07/19 05:02:46 kris Exp $
  34  */
  35
  36 #include <err.h>
  37 #include <pwd.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <time.h>
  41 #include <utmpx.h>
  42 #include <unistd.h>
  43
  44 static  void    outputx(struct passwd *, struct lastlogx *);
  45 static  void    usage(void);
  46
  47 int
  48 main(int argc, char **argv)
  49 {
  50         int     ch, i;
  51         struct passwd   *passwd;
  52         struct lastlogx lastx;
  53
  54         while ((ch = getopt(argc, argv, "")) != -1) {
  55                 usage();
  56         }
  57
  58         setpassent(1);  /* Keep passwd file pointers open */
  59
  60         /* Process usernames given on the command line. */
  61         if (argc > 1) {
  62                 for (i = 1; i < argc; ++i) {
  63                         if ((passwd = getpwnam(argv[i])) == NULL) {
  64                                 warnx("user '%s' not found", argv[i]);
  65                                 continue;
  66                         }
  67                         if ((getlastlogx(_PATH_LASTLOGX, passwd->pw_uid,
  68                             &lastx)) != NULL) {
  69                                 outputx(passwd, &lastx);
  70                                 goto done;
  71                         }
  72                 }
  73         }
  74         /* Read all lastlogx entries, looking for active ones */
  75         else {
  76                 while ((passwd = getpwent()) != NULL) {
  77                         if ((getlastlogx(_PATH_LASTLOGX, passwd->pw_uid,
  78                             &lastx)) != NULL) {
  79                                 if (lastx.ll_tv.tv_sec == 0)
  80                                         continue;
  81                                 outputx(passwd, &lastx);
  82                         }
  83                 }
  84         }
  85
  86 done:
  87         setpassent(0);  /* Close passwd file pointers */
  88
  89         exit(0);
  90 }
  91
  92 static void
  93 outputx(struct passwd *p, struct lastlogx *l)
  94 {
  95         printf("%-10s  %-8s %-22.22s   %s",
  96                 p->pw_name, l->ll_line, l->ll_host,
  97                 (l->ll_tv.tv_sec) ? ctime((&l->ll_tv.tv_sec)) : "Never logged in\n");
  98 }
  99
 100 static void
 101 usage(void)
 102 {
 103         fprintf(stderr, "usage: lastlogin [user ...]\n");
 104         exit(1);
 105 }