xref: /netbsd/usr.sbin/ac/ac.c (revision bf9ec67e) 
1 /* $NetBSD: ac.c,v 1.14 2001/02/19 23:22:40 cgd Exp $ */
2 
3 /*
4  * Copyright (c) 1994 Christopher G. Demetriou
5  * 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. All advertising materials mentioning features or use of this software
16  *    must display the following acknowledgement:
17  *          This product includes software developed for the
18  *          NetBSD Project.  See http://www.netbsd.org/ for
19  *          information about NetBSD.
20  * 4. The name of the author may not be used to endorse or promote products
21  *    derived from this software without specific prior written permission.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33  *
34  * <<Id: LICENSE,v 1.2 2000/06/14 15:57:33 cgd Exp>>
35  *
36  *
37  *      @(#)Copyright (c) 1994, Simon J. Gerraty.
38  *
39  *      This is free software.  It comes with NO WARRANTY.
40  *      Permission to use, modify and distribute this source code
41  *      is granted subject to the following conditions.
42  *      1/ that the above copyright notice and this notice
43  *      are preserved in all copies and that due credit be given
44  *      to the author.
45  *      2/ that any changes to this code are clearly commented
46  *      as such so that the author does not get blamed for bugs
47  *      other than his own.
48  */
49 
50 #include <sys/cdefs.h>
51 #ifndef lint
52 __RCSID("$NetBSD: ac.c,v 1.14 2001/02/19 23:22:40 cgd Exp $");
53 #endif
54 
55 #include <sys/types.h>
56 
57 #include <err.h>
58 #include <errno.h>
59 #include <pwd.h>
60 #include <stdio.h>
61 #include <string.h>
62 #include <stdlib.h>
63 #include <unistd.h>
64 #include <string.h>
65 #include <time.h>
66 #include <utmp.h>
67 #include <ttyent.h>
68 
69 /*
70  * this is for our list of currently logged in sessions
71  */
72 struct utmp_list {
73 	struct utmp_list *next;
74 	struct utmp usr;
75 };
76 
77 /*
78  * this is for our list of users that are accumulating time.
79  */
80 struct user_list {
81 	struct user_list *next;
82 	char	name[UT_NAMESIZE+1];
83 	time_t	secs;
84 };
85 
86 /*
87  * this is for chosing whether to ignore a login
88  */
89 struct tty_list {
90 	struct tty_list *next;
91 	char	name[UT_LINESIZE+3];
92 	int	len;
93 	int	ret;
94 };
95 
96 /*
97  * globals - yes yuk
98  */
99 static time_t	Total = 0;
100 static time_t	FirstTime = 0;
101 static int	Flags = 0;
102 static struct user_list *Users = NULL;
103 static struct tty_list *Ttys = NULL;
104 static int Maxcon = 0, Ncon = 0;
105 static char (*Con)[UT_LINESIZE] = NULL;
106 
107 #define NEW(type) (type *)malloc(sizeof (type))
108 
109 #define is_login_tty(line) \
110 	(bsearch(line, Con, Ncon, sizeof(Con[0]), compare) != NULL)
111 
112 #define	AC_W	1				/* not _PATH_WTMP */
113 #define	AC_D	2				/* daily totals (ignore -p) */
114 #define	AC_P	4				/* per-user totals */
115 #define	AC_U	8				/* specified users only */
116 #define	AC_T	16				/* specified ttys only */
117 
118 #ifdef DEBUG
119 static int Debug = 0;
120 #endif
121 
122 int			main __P((int, char **));
123 static int		ac __P((FILE *));
124 static struct tty_list	*add_tty __P((char *));
125 static int		do_tty __P((char *));
126 static FILE		*file __P((char *));
127 static struct utmp_list	*log_in __P((struct utmp_list *, struct utmp *));
128 static struct utmp_list	*log_out __P((struct utmp_list *, struct utmp *));
129 #ifdef notdef
130 static int		on_console __P((struct utmp_list *));
131 #endif
132 static void		find_login_ttys __P((void));
133 static void		show __P((char *, time_t));
134 static void		show_today __P((struct user_list *, struct utmp_list *,
135     time_t));
136 static void		show_users __P((struct user_list *));
137 static struct user_list	*update_user __P((struct user_list *, char *, time_t));
138 static int		compare __P((const void *, const void *));
139 static void		usage __P((void));
140 
141 /*
142  * open wtmp or die
143  */
144 static FILE *
145 file(name)
146 	char *name;
147 {
148 	FILE *fp;
149 
150 	if (strcmp(name, "-") == 0)
151 		fp = stdin;
152 	else if ((fp = fopen(name, "r")) == NULL)
153 		err(1, "%s", name);
154 	/* in case we want to discriminate */
155 	if (strcmp(_PATH_WTMP, name))
156 		Flags |= AC_W;
157 	return fp;
158 }
159 
160 static struct tty_list *
161 add_tty(name)
162 	char *name;
163 {
164 	struct tty_list *tp;
165 	char *rcp;
166 
167 	Flags |= AC_T;
168 
169 	if ((tp = NEW(struct tty_list)) == NULL)
170 		err(1, "malloc");
171 	tp->len = 0;				/* full match */
172 	tp->ret = 1;				/* do if match */
173 	if (*name == '!') {			/* don't do if match */
174 		tp->ret = 0;
175 		name++;
176 	}
177 	(void)strncpy(tp->name, name, sizeof (tp->name) - 1);
178 	tp->name[sizeof (tp->name) - 1] = '\0';
179 	if ((rcp = strchr(tp->name, '*')) != NULL) {	/* wild card */
180 		*rcp = '\0';
181 		tp->len = strlen(tp->name);	/* match len bytes only */
182 	}
183 	tp->next = Ttys;
184 	Ttys = tp;
185 	return Ttys;
186 }
187 
188 /*
189  * should we process the named tty?
190  */
191 static int
192 do_tty(name)
193 	char *name;
194 {
195 	struct tty_list *tp;
196 	int def_ret = 0;
197 
198 	for (tp = Ttys; tp != NULL; tp = tp->next) {
199 		if (tp->ret == 0)		/* specific don't */
200 			def_ret = 1;		/* default do */
201 		if (tp->len != 0) {
202 			if (strncmp(name, tp->name, tp->len) == 0)
203 				return tp->ret;
204 		} else {
205 			if (strncmp(name, tp->name, sizeof (tp->name)) == 0)
206 				return tp->ret;
207 		}
208 	}
209 	return def_ret;
210 }
211 
212 static int
213 compare(a, b)
214 	const void *a, *b;
215 {
216 	return strncmp(a, b, UT_LINESIZE);
217 }
218 
219 /*
220  * Deal correctly with multiple virtual consoles/login ttys.
221  * We read the ttyent's from /etc/ttys and classify as login
222  * ttys ones that are running getty and they are turned on.
223  */
224 static void
225 find_login_ttys()
226 {
227 	struct ttyent *tty;
228 
229 	if ((Con = malloc((Maxcon = 10) * sizeof(Con[0]))) == NULL)
230 		err(1, "malloc");
231 
232 	setttyent();
233 	while ((tty = getttyent()) != NULL)
234 		if ((tty->ty_status & TTY_ON) != 0 &&
235 		    strstr(tty->ty_getty, "getty") != NULL) {
236 			if (Ncon == Maxcon)
237 				if ((Con = realloc(Con, (Maxcon += 10) *
238 				    sizeof(Con[0]))) == NULL)
239 					err(1, "malloc");
240 			(void)strncpy(Con[Ncon++], tty->ty_name, UT_LINESIZE);
241 		}
242 	endttyent();
243 	qsort(Con, Ncon, sizeof(Con[0]), compare);
244 }
245 
246 #ifdef notdef
247 /*
248  * is someone logged in on Console/login tty?
249  */
250 static int
251 on_console(head)
252 	struct utmp_list *head;
253 {
254 	struct utmp_list *up;
255 
256 	for (up = head; up; up = up->next)
257 		if (is_login_tty(up->usr.ut_line))
258 			return 1;
259 
260 	return 0;
261 }
262 #endif
263 
264 /*
265  * update user's login time
266  */
267 static struct user_list *
268 update_user(head, name, secs)
269 	struct user_list *head;
270 	char	*name;
271 	time_t	secs;
272 {
273 	struct user_list *up;
274 
275 	for (up = head; up != NULL; up = up->next) {
276 		if (strncmp(up->name, name, sizeof (up->name) - 1) == 0) {
277 			up->secs += secs;
278 			Total += secs;
279 			return head;
280 		}
281 	}
282 	/*
283 	 * not found so add new user unless specified users only
284 	 */
285 	if (Flags & AC_U)
286 		return head;
287 
288 	if ((up = NEW(struct user_list)) == NULL)
289 		err(1, "malloc");
290 	up->next = head;
291 	(void)strncpy(up->name, name, sizeof (up->name) - 1);
292 	up->name[sizeof (up->name) - 1] = '\0';	/* paranoid! */
293 	up->secs = secs;
294 	Total += secs;
295 	return up;
296 }
297 
298 int
299 main(argc, argv)
300 	int	argc;
301 	char	**argv;
302 {
303 	FILE *fp;
304 	int c;
305 
306 	fp = NULL;
307 	while ((c = getopt(argc, argv, "Dc:dpt:w:")) != -1) {
308 		switch (c) {
309 #ifdef DEBUG
310 		case 'D':
311 			Debug++;
312 			break;
313 #endif
314 		case 'd':
315 			Flags |= AC_D;
316 			break;
317 		case 'p':
318 			Flags |= AC_P;
319 			break;
320 		case 't':			/* only do specified ttys */
321 			add_tty(optarg);
322 			break;
323 		case 'w':
324 			fp = file(optarg);
325 			break;
326 		case '?':
327 		default:
328 			usage();
329 			break;
330 		}
331 	}
332 
333 	find_login_ttys();
334 
335 	if (optind < argc) {
336 		/*
337 		 * initialize user list
338 		 */
339 		for (; optind < argc; optind++) {
340 			Users = update_user(Users, argv[optind], 0L);
341 		}
342 		Flags |= AC_U;			/* freeze user list */
343 	}
344 	if (Flags & AC_D)
345 		Flags &= ~AC_P;
346 	if (fp == NULL) {
347 		/*
348 		 * if _PATH_WTMP does not exist, exit quietly
349 		 */
350 		if (access(_PATH_WTMP, 0) != 0 && errno == ENOENT)
351 			return 0;
352 
353 		fp = file(_PATH_WTMP);
354 	}
355 	ac(fp);
356 
357 	return 0;
358 }
359 
360 /*
361  * print login time in decimal hours
362  */
363 static void
364 show(name, secs)
365 	char *name;
366 	time_t secs;
367 {
368 	(void)printf("\t%-*s %8.2f\n", UT_NAMESIZE, name,
369 	    ((double)secs / 3600));
370 }
371 
372 static void
373 show_users(list)
374 	struct user_list *list;
375 {
376 	struct user_list *lp;
377 
378 	for (lp = list; lp; lp = lp->next)
379 		show(lp->name, lp->secs);
380 }
381 
382 /*
383  * print total login time for 24hr period in decimal hours
384  */
385 static void
386 show_today(users, logins, secs)
387 	struct user_list *users;
388 	struct utmp_list *logins;
389 	time_t secs;
390 {
391 	struct user_list *up;
392 	struct utmp_list *lp;
393 	char date[64];
394 	time_t yesterday = secs - 1;
395 
396 	(void)strftime(date, sizeof (date), "%b %e  total",
397 	    localtime(&yesterday));
398 
399 	/* restore the missing second */
400 	yesterday++;
401 
402 	for (lp = logins; lp != NULL; lp = lp->next) {
403 		secs = yesterday - lp->usr.ut_time;
404 		Users = update_user(Users, lp->usr.ut_name, secs);
405 		lp->usr.ut_time = yesterday;	/* as if they just logged in */
406 	}
407 	secs = 0;
408 	for (up = users; up != NULL; up = up->next) {
409 		secs += up->secs;
410 		up->secs = 0;			/* for next day */
411 	}
412  	if (secs)
413 		(void)printf("%s %11.2f\n", date, ((double)secs / 3600));
414 }
415 
416 /*
417  * log a user out and update their times.
418  * if ut_line is "~", we log all users out as the system has
419  * been shut down.
420  */
421 static struct utmp_list *
422 log_out(head, up)
423 	struct utmp_list *head;
424 	struct utmp *up;
425 {
426 	struct utmp_list *lp, *lp2, *tlp;
427 	time_t secs;
428 
429 	for (lp = head, lp2 = NULL; lp != NULL; )
430 		if (*up->ut_line == '~' || strncmp(lp->usr.ut_line, up->ut_line,
431 		    sizeof (up->ut_line)) == 0) {
432 			secs = up->ut_time - lp->usr.ut_time;
433 			Users = update_user(Users, lp->usr.ut_name, secs);
434 #ifdef DEBUG
435 			if (Debug)
436 				printf("%-.*s %-.*s: %-.*s logged out (%2d:%02d:%02d)\n",
437 				    19, ctime(&up->ut_time),
438 				    sizeof (lp->usr.ut_line), lp->usr.ut_line,
439 				    sizeof (lp->usr.ut_name), lp->usr.ut_name,
440 				    secs / 3600, (secs % 3600) / 60, secs % 60);
441 #endif
442 			/*
443 			 * now lose it
444 			 */
445 			tlp = lp;
446 			lp = lp->next;
447 			if (tlp == head)
448 				head = lp;
449 			else if (lp2 != NULL)
450 				lp2->next = lp;
451 			free(tlp);
452 		} else {
453 			lp2 = lp;
454 			lp = lp->next;
455 		}
456 	return head;
457 }
458 
459 
460 /*
461  * if do_tty says ok, login a user
462  */
463 struct utmp_list *
464 log_in(head, up)
465 	struct utmp_list *head;
466 	struct utmp *up;
467 {
468 	struct utmp_list *lp;
469 
470 	/*
471 	 * If we are doing specified ttys only, we ignore
472 	 * anything else.
473 	 */
474 	if (Flags & AC_T)
475 		if (!do_tty(up->ut_line))
476 			return head;
477 
478 	/*
479 	 * go ahead and log them in
480 	 */
481 	if ((lp = NEW(struct utmp_list)) == NULL)
482 		err(1, "malloc");
483 	lp->next = head;
484 	head = lp;
485 	memmove((char *)&lp->usr, (char *)up, sizeof (struct utmp));
486 #ifdef DEBUG
487 	if (Debug) {
488 		printf("%-.*s %-.*s: %-.*s logged in", 19,
489 		    ctime(&lp->usr.ut_time), sizeof (up->ut_line),
490 		       up->ut_line, sizeof (up->ut_name), up->ut_name);
491 		if (*up->ut_host)
492 			printf(" (%-.*s)", sizeof (up->ut_host), up->ut_host);
493 		putchar('\n');
494 	}
495 #endif
496 	return head;
497 }
498 
499 static int
500 ac(fp)
501 	FILE	*fp;
502 {
503 	struct utmp_list *lp, *head = NULL;
504 	struct utmp usr;
505 	struct tm *ltm;
506 	time_t secs = 0;
507 	int day = -1;
508 
509 	while (fread((char *)&usr, sizeof(usr), 1, fp) == 1) {
510 		if (!FirstTime)
511 			FirstTime = usr.ut_time;
512 		if (Flags & AC_D) {
513 			ltm = localtime(&usr.ut_time);
514 			if (day >= 0 && day != ltm->tm_yday) {
515 				day = ltm->tm_yday;
516 				/*
517 				 * print yesterday's total
518 				 */
519 				secs = usr.ut_time;
520 				secs -= ltm->tm_sec;
521 				secs -= 60 * ltm->tm_min;
522 				secs -= 3600 * ltm->tm_hour;
523 				show_today(Users, head, secs);
524 			} else
525 				day = ltm->tm_yday;
526 		}
527 		switch(*usr.ut_line) {
528 		case '|':
529 			secs = usr.ut_time;
530 			break;
531 		case '{':
532 			secs -= usr.ut_time;
533 			/*
534 			 * adjust time for those logged in
535 			 */
536 			for (lp = head; lp != NULL; lp = lp->next)
537 				lp->usr.ut_time -= secs;
538 			break;
539 		case '~':			/* reboot or shutdown */
540 			head = log_out(head, &usr);
541 			FirstTime = usr.ut_time; /* shouldn't be needed */
542 			break;
543 		default:
544 			/*
545 			 * if they came in on tty[p-y]*, then it is only
546 			 * a login session if the ut_host field is non-empty,
547 			 * or this tty is a login tty [eg. a console]
548 			 */
549 			if (*usr.ut_name) {
550 				if ((strncmp(usr.ut_line, "tty", 3) != 0 &&
551 				    strncmp(usr.ut_line, "dty", 3) != 0) ||
552 				    strchr("pqrstuvwxyzPQRST", usr.ut_line[3]) == 0 ||
553 				    *usr.ut_host != '\0' ||
554 				    is_login_tty(usr.ut_line))
555 					head = log_in(head, &usr);
556 #ifdef DEBUG
557 				else if (Debug)
558 					printf("%-.*s %-.*s: %-.*s ignored\n",
559 					    19, ctime(&usr.ut_time),
560 					    sizeof (usr.ut_line), usr.ut_line,
561 					    sizeof (usr.ut_name), usr.ut_name);
562 #endif
563 			} else
564 				head = log_out(head, &usr);
565 			break;
566 		}
567 	}
568 	(void)fclose(fp);
569 	usr.ut_time = time((time_t *)0);
570 	(void)strcpy(usr.ut_line, "~");
571 
572 	if (Flags & AC_D) {
573 		ltm = localtime(&usr.ut_time);
574 		if (day >= 0 && day != ltm->tm_yday) {
575 			/*
576 			 * print yesterday's total
577 			 */
578 			secs = usr.ut_time;
579 			secs -= ltm->tm_sec;
580 			secs -= 60 * ltm->tm_min;
581 			secs -= 3600 * ltm->tm_hour;
582 			show_today(Users, head, secs);
583 		}
584 	}
585 	/*
586 	 * anyone still logged in gets time up to now
587 	 */
588 	head = log_out(head, &usr);
589 
590 	if (Flags & AC_D)
591 		show_today(Users, head, time((time_t *)0));
592 	else {
593 		if (Flags & AC_P)
594 			show_users(Users);
595 		show("total", Total);
596 	}
597 	return 0;
598 }
599 
600 static void
601 usage()
602 {
603 
604 	(void)fprintf(stderr,
605 	    "Usage: %s [-d | -p] [-t tty] [-w wtmp] [users ...]\n",
606 	    getprogname());
607 	exit(1);
608 }
609