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/*
* Copyright (c) 1996 John M. Vinopal
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed for the NetBSD Project
* by John M. Vinopal.
* 4. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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 <sys/cdefs.h>
#ifndef lint
__RCSID("$FreeBSD$");
__RCSID("$NetBSD: lastlogin.c,v 1.4 1998/02/03 04:45:35 perry Exp $");
#endif
#include <err.h>
#include <pwd.h>
#include <stdio.h>
#include <time.h>
#include <utmp.h>
#include <unistd.h>
static const char *logfile = _PATH_LASTLOG;
int main __P((int, char **));
static void output __P((struct passwd *, struct lastlog *));
static void usage __P((void));
int
main(argc, argv)
int argc;
char *argv[];
{
int ch, i;
FILE *fp;
struct passwd *passwd;
struct lastlog last;
while ((ch = getopt(argc, argv, "")) != -1) {
usage();
}
fp = fopen(logfile, "r");
if (fp == NULL)
err(1, "%s", logfile);
setpassent(1); /* Keep passwd file pointers open */
/* Process usernames given on the command line. */
if (argc > 1) {
long offset;
for (i = 1; i < argc; ++i) {
if ((passwd = getpwnam(argv[i])) == NULL) {
warnx("user '%s' not found", argv[i]);
continue;
}
/* Calculate the offset into the lastlog file. */
offset = (long)(passwd->pw_uid * sizeof(last));
if (fseek(fp, offset, SEEK_SET)) {
warn("fseek error");
continue;
}
if (fread(&last, sizeof(last), 1, fp) != 1) {
warnx("fread error on '%s'", passwd->pw_name);
clearerr(fp);
continue;
}
output(passwd, &last);
}
}
/* Read all lastlog entries, looking for active ones */
else {
for (i = 0; fread(&last, sizeof(last), 1, fp) == 1; i++) {
if (last.ll_time == 0)
continue;
if ((passwd = getpwuid((uid_t)i)) != NULL)
output(passwd, &last);
}
if (ferror(fp))
warnx("fread error");
}
setpassent(0); /* Close passwd file pointers */
fclose(fp);
exit(0);
}
/* Duplicate the output of last(1) */
static void
output(p, l)
struct passwd *p;
struct lastlog *l;
{
printf("%-*.*s %-*.*s %-*.*s %s",
UT_NAMESIZE, UT_NAMESIZE, p->pw_name,
UT_LINESIZE, UT_LINESIZE, l->ll_line,
UT_HOSTSIZE, UT_HOSTSIZE, l->ll_host,
(l->ll_time) ? ctime(&(l->ll_time)) : "Never logged in\n");
}
static void
usage()
{
fprintf(stderr, "usage: lastlogin [user ...]\n");
exit(1);
}
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