lastcomm.c revision 1.17 
1/*	$OpenBSD: lastcomm.c,v 1.17 2009/10/27 23:59:39 deraadt Exp $	*/
2/*	$NetBSD: lastcomm.c,v 1.9 1995/10/22 01:43:42 ghudson Exp $	*/
3
4/*
5 * Copyright (c) 1980, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, 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
33#include <sys/param.h>
34#include <sys/stat.h>
35#include <sys/acct.h>
36
37#include <ctype.h>
38#include <err.h>
39#include <fcntl.h>
40#include <math.h>
41#include <stdio.h>
42#include <stdlib.h>
43#include <string.h>
44#include <struct.h>
45#include <tzfile.h>
46#include <unistd.h>
47#include <utmp.h>
48#include <pwd.h>
49#include "pathnames.h"
50
51time_t	 expand(u_int);
52char	*flagbits(int);
53char	*getdev(dev_t);
54int	 requested(char *[], struct acct *);
55void	 usage(void);
56
57int
58main(int argc, char *argv[])
59{
60	char *p;
61	struct acct ab;
62	struct stat sb;
63	FILE *fp;
64	off_t size;
65	time_t t;
66	double delta;
67	int ch;
68	char *acctfile;
69
70	acctfile = _PATH_ACCT;
71	while ((ch = getopt(argc, argv, "f:")) != -1)
72		switch((char)ch) {
73		case 'f':
74			acctfile = optarg;
75			break;
76		case '?':
77		default:
78			usage();
79		}
80	argc -= optind;
81	argv += optind;
82
83	/* Open the file. */
84	if ((fp = fopen(acctfile, "r")) == NULL || fstat(fileno(fp), &sb))
85		err(1, "%s", acctfile);
86
87	/*
88	 * Round off to integral number of accounting records, probably
89	 * not necessary, but it doesn't hurt.
90	 */
91	size = sb.st_size - sb.st_size % sizeof(struct acct);
92
93	/* Check if any records to display. */
94	if (size < sizeof(struct acct))
95		exit(0);
96
97	/*
98	 * Seek to before the last entry in the file; use lseek(2) in case
99	 * the file is bigger than a "long".
100	 */
101	size -= sizeof(struct acct);
102	if (lseek(fileno(fp), size, SEEK_SET) == -1)
103		err(1, "%s", acctfile);
104
105	for (;;) {
106		if (fread(&ab, sizeof(struct acct), 1, fp) != 1)
107			err(1, "%s", acctfile);
108
109		if (ab.ac_comm[0] == '\0') {
110			ab.ac_comm[0] = '?';
111			ab.ac_comm[1] = '\0';
112		} else
113			for (p = &ab.ac_comm[0];
114			    p < &ab.ac_comm[fldsiz(acct, ac_comm)] && *p; ++p)
115				if (!isprint(*p))
116					*p = '?';
117		if (!*argv || requested(argv, &ab))
118		{
119			t = expand(ab.ac_utime) + expand(ab.ac_stime);
120			(void)printf("%-*.*s %-7s %-*.*s %-*.*s %6.2f secs %.16s",
121			    (int)fldsiz(acct, ac_comm),
122			    (int)fldsiz(acct, ac_comm),
123			    ab.ac_comm, flagbits(ab.ac_flag), UT_NAMESIZE,
124			    UT_NAMESIZE, user_from_uid(ab.ac_uid, 0),
125			    UT_LINESIZE, UT_LINESIZE, getdev(ab.ac_tty),
126			    t / (double)AHZ, ctime(&ab.ac_btime));
127			delta = expand(ab.ac_etime) / (double)AHZ;
128			printf(" (%1.0f:%02.0f:%05.2f)\n",
129			    delta / SECSPERHOUR,
130			    fmod(delta, (double)SECSPERHOUR) / SECSPERMIN,
131			    fmod(delta, (double)SECSPERMIN));
132		}
133
134		if (size == 0)
135			break;
136		/* seek to previous entry */
137		if (fseek(fp, 2 * -(long)sizeof(struct acct), SEEK_CUR) == -1)
138			err(1, "%s", acctfile);
139		size -= sizeof(struct acct);
140	}
141	exit(0);
142}
143
144time_t
145expand(u_int t)
146{
147	time_t nt;
148
149	nt = t & 017777;
150	t >>= 13;
151	while (t) {
152		t--;
153		nt <<= 3;
154	}
155	return (nt);
156}
157
158char *
159flagbits(int f)
160{
161	static char flags[20] = "-";
162	char *p;
163
164#define	BIT(flag, ch)	if (f & flag) *p++ = ch
165
166	p = flags + 1;
167	BIT(ASU, 'S');
168	BIT(AFORK, 'F');
169	BIT(ACOMPAT, 'C');
170	BIT(ACORE, 'D');
171	BIT(AXSIG, 'X');
172	*p = '\0';
173	return (flags);
174}
175
176int
177requested(char *argv[], struct acct *acp)
178{
179	do {
180		if (!strcmp(user_from_uid(acp->ac_uid, 0), *argv))
181			return (1);
182		if (!strcmp(getdev(acp->ac_tty), *argv))
183			return (1);
184		if (!strncmp(acp->ac_comm, *argv, fldsiz(acct, ac_comm)))
185			return (1);
186	} while (*++argv);
187	return (0);
188}
189
190char *
191getdev(dev_t dev)
192{
193	static dev_t lastdev = (dev_t)-1;
194	static char *lastname;
195
196	if (dev == NODEV)			/* Special case. */
197		return ("__");
198	if (dev == lastdev)			/* One-element cache. */
199		return (lastname);
200	lastdev = dev;
201	if ((lastname = devname(dev, S_IFCHR)) == NULL)
202		lastname = "??";
203	return (lastname);
204}
205
206void
207usage(void)
208{
209	(void)fprintf(stderr,
210	    "usage: lastcomm [-f file] [command ...] [user ...] [terminal ...]\n");
211	exit(1);
212}
213