131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
/*
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* Copyright (c) 1996 John M. Vinopal
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed for the NetBSD Project
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* by John M. Vinopal.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$FreeBSD$");
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__RCSID("$NetBSD: lastlogin.c,v 1.4 1998/02/03 04:45:35 perry Exp $");
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#endif
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#include <err.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <time.h>
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#include <utmp.h>
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#include <unistd.h>
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static const char *logfile = _PATH_LASTLOG;
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int main __P((int, char **));
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static void output __P((struct passwd *, struct lastlog *));
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static void usage __P((void));
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int ch, i;
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FILE *fp;
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struct passwd *passwd;
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struct lastlog last;
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while ((ch = getopt(argc, argv, "")) != -1) {
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usage();
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}
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fp = fopen(logfile, "r");
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if (fp == NULL)
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err(1, "%s", logfile);
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setpassent(1); /* Keep passwd file pointers open */
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/* Process usernames given on the command line. */
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if (argc > 1) {
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long offset;
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for (i = 1; i < argc; ++i) {
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if ((passwd = getpwnam(argv[i])) == NULL) {
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warnx("user '%s' not found", argv[i]);
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continue;
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}
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/* Calculate the offset into the lastlog file. */
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offset = (long)(passwd->pw_uid * sizeof(last));
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if (fseek(fp, offset, SEEK_SET)) {
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warn("fseek error");
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continue;
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}
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if (fread(&last, sizeof(last), 1, fp) != 1) {
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warnx("fread error on '%s'", passwd->pw_name);
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clearerr(fp);
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continue;
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}
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output(passwd, &last);
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}
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}
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/* Read all lastlog entries, looking for active ones */
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else {
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for (i = 0; fread(&last, sizeof(last), 1, fp) == 1; i++) {
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if (last.ll_time == 0)
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continue;
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if ((passwd = getpwuid((uid_t)i)) != NULL)
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output(passwd, &last);
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}
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if (ferror(fp))
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warnx("fread error");
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}
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setpassent(0); /* Close passwd file pointers */
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fclose(fp);
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exit(0);
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}
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/* Duplicate the output of last(1) */
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static void
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output(p, l)
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struct passwd *p;
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struct lastlog *l;
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{
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printf("%-*.*s %-*.*s %-*.*s %s",
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UT_NAMESIZE, UT_NAMESIZE, p->pw_name,
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UT_LINESIZE, UT_LINESIZE, l->ll_line,
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UT_HOSTSIZE, UT_HOSTSIZE, l->ll_host,
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(l->ll_time) ? ctime(&(l->ll_time)) : "Never logged in\n");
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}
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static void
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usage()
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{
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fprintf(stderr, "usage: lastlogin [user ...]\n");
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exit(1);
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}
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