1/*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1980, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1980, 1993\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)lastcomm.c	8.1 (Berkeley) 6/6/93";
41#endif
42#endif /* not lint */
43#include <sys/cdefs.h>
44__FBSDID("$FreeBSD$");
45
46#include <sys/param.h>
47#include <sys/stat.h>
48#include <sys/acct.h>
49
50#include <ctype.h>
51#include <err.h>
52#include <errno.h>
53#include <pwd.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <time.h>
58#include <unistd.h>
59#include "pathnames.h"
60
61/*XXX*/#include <inttypes.h>
62
63time_t	 expand(u_int);
64char	*flagbits(int);
65const	 char *getdev(dev_t);
66int	 readrec_forward(FILE *f, struct acctv3 *av3);
67int	 readrec_backward(FILE *f, struct acctv3 *av3);
68int	 requested(char *[], struct acctv3 *);
69static	 void usage(void);
70
71#define AC_UTIME 1 /* user */
72#define AC_STIME 2 /* system */
73#define AC_ETIME 4 /* elapsed */
74#define AC_CTIME 8 /* user + system time, default */
75
76#define AC_BTIME 16 /* starting time */
77#define AC_FTIME 32 /* exit time (starting time + elapsed time )*/
78
79int
80main(int argc, char *argv[])
81{
82	struct acctv3 ab;
83	char *p;
84	FILE *fp;
85	int (*readrec)(FILE *f, struct acctv3 *av3);
86	time_t t;
87	int ch, rv;
88	const char *acctfile, *format;
89	char buf[1024];
90	int flags = 0;
91
92	acctfile = _PATH_ACCT;
93	format = NULL;
94	while ((ch = getopt(argc, argv, "f:usecSE")) != -1)
95		switch((char)ch) {
96		case 'f':
97			acctfile = optarg;
98			break;
99
100		case 'u':
101			flags |= AC_UTIME; /* user time */
102			break;
103		case 's':
104			flags |= AC_STIME; /* system time */
105			break;
106		case 'e':
107			flags |= AC_ETIME; /* elapsed time */
108			break;
109        	case 'c':
110                        flags |= AC_CTIME; /* user + system time */
111			break;
112
113        	case 'S':
114                        flags |= AC_BTIME; /* starting time */
115			break;
116        	case 'E':
117			/* exit time (starting time + elapsed time )*/
118                        flags |= AC_FTIME;
119			break;
120
121		case '?':
122		default:
123			usage();
124		}
125
126	/* default user + system time and starting time */
127	if (!flags) {
128	    flags = AC_CTIME | AC_BTIME;
129	}
130
131	argc -= optind;
132	argv += optind;
133
134	if (argc > 0 && **argv == '+') {
135		format = *argv + 1; /* skip + */
136		argc--;
137		argv++;
138	}
139
140	if (strcmp(acctfile, "-") == 0) {
141		fp = stdin;
142		readrec = readrec_forward;
143	} else {
144		/* Open the file. */
145		if ((fp = fopen(acctfile, "r")) == NULL)
146			err(1, "could not open %s", acctfile);
147		if (fseek(fp, 0l, SEEK_END) == -1)
148			err(1, "seek to end of %s failed", acctfile);
149		readrec = readrec_backward;
150	}
151
152	while ((rv = readrec(fp, &ab)) == 1) {
153		for (p = &ab.ac_comm[0];
154		    p < &ab.ac_comm[AC_COMM_LEN] && *p; ++p)
155			if (!isprint(*p))
156				*p = '?';
157
158		if (*argv && !requested(argv, &ab))
159			continue;
160
161		(void)printf("%-*.*s %-7s %-*s %-8s",
162			     AC_COMM_LEN, AC_COMM_LEN, ab.ac_comm,
163			     flagbits(ab.ac_flagx),
164			     MAXLOGNAME - 1, user_from_uid(ab.ac_uid, 0),
165			     getdev(ab.ac_tty));
166
167
168		/* user + system time */
169		if (flags & AC_CTIME) {
170			(void)printf(" %6.3f secs",
171			    (ab.ac_utime + ab.ac_stime) / 1000000);
172		}
173
174		/* usr time */
175		if (flags & AC_UTIME) {
176			(void)printf(" %6.3f us", ab.ac_utime / 1000000);
177		}
178
179		/* system time */
180		if (flags & AC_STIME) {
181			(void)printf(" %6.3f sy", ab.ac_stime / 1000000);
182		}
183
184		/* elapsed time */
185		if (flags & AC_ETIME) {
186			(void)printf(" %8.3f es", ab.ac_etime / 1000000);
187		}
188
189		/* starting time */
190		if (flags & AC_BTIME) {
191			if (format != NULL) {
192				(void)strftime(buf, sizeof(buf), format,
193				    localtime(&ab.ac_btime));
194				(void)printf(" %s", buf);
195			} else
196				(void)printf(" %.16s", ctime(&ab.ac_btime));
197		}
198
199		/* exit time (starting time + elapsed time )*/
200		if (flags & AC_FTIME) {
201			t = ab.ac_btime;
202			t += (time_t)(ab.ac_etime / 1000000);
203			if (format != NULL) {
204				(void)strftime(buf, sizeof(buf), format,
205				    localtime(&t));
206				(void)printf(" %s", buf);
207			} else
208				(void)printf(" %.16s", ctime(&t));
209		}
210		printf("\n");
211 	}
212	if (rv == EOF)
213		err(1, "read record from %s failed", acctfile);
214
215	if (fflush(stdout))
216		err(1, "stdout");
217 	exit(0);
218}
219
220char *
221flagbits(int f)
222{
223	static char flags[20] = "-";
224	char *p;
225
226#define	BIT(flag, ch)	if (f & flag) *p++ = ch
227
228	p = flags + 1;
229	BIT(ASU, 'S');
230	BIT(AFORK, 'F');
231	BIT(ACOMPAT, 'C');
232	BIT(ACORE, 'D');
233	BIT(AXSIG, 'X');
234	*p = '\0';
235	return (flags);
236}
237
238int
239requested(char *argv[], struct acctv3 *acp)
240{
241	const char *p;
242
243	do {
244		p = user_from_uid(acp->ac_uid, 0);
245		if (!strcmp(p, *argv))
246			return (1);
247		if ((p = getdev(acp->ac_tty)) && !strcmp(p, *argv))
248			return (1);
249		if (!strncmp(acp->ac_comm, *argv, AC_COMM_LEN))
250			return (1);
251	} while (*++argv);
252	return (0);
253}
254
255const char *
256getdev(dev_t dev)
257{
258	static dev_t lastdev = (dev_t)-1;
259	static const char *lastname;
260
261	if (dev == NODEV)			/* Special case. */
262		return ("__");
263	if (dev == lastdev)			/* One-element cache. */
264		return (lastname);
265	lastdev = dev;
266	lastname = devname(dev, S_IFCHR);
267	return (lastname);
268}
269
270static void
271usage(void)
272{
273	(void)fprintf(stderr,
274	    "usage: lastcomm [-EScesu] [-f file] [+format] [command ...] "
275	    "[user ...] [terminal ...]\n");
276	exit(1);
277}
278