xref: /freebsd/usr.sbin/ac/ac.c (revision ebbd4fa8c8427d3dd847ba33c45c996e0500e6ff)
1 /*
2  *      Copyright (c) 1994 Christopher G. Demetriou.
3  *      @(#)Copyright (c) 1994, Simon J. Gerraty.
4  *
5  *      This is free software.  It comes with NO WARRANTY.
6  *      Permission to use, modify and distribute this source code
7  *      is granted subject to the following conditions.
8  *      1/ that the above copyright notice and this notice
9  *      are preserved in all copies and that due credit be given
10  *      to the author.
11  *      2/ that any changes to this code are clearly commented
12  *      as such so that the author does not get blamed for bugs
13  *      other than his own.
14  */
15 
16 #ifndef lint
17 static const char rcsid[] =
18   "$FreeBSD$";
19 #endif /* not lint */
20 
21 #include <sys/types.h>
22 #include <sys/file.h>
23 #include <sys/time.h>
24 #include <err.h>
25 #include <errno.h>
26 #include <langinfo.h>
27 #include <locale.h>
28 #include <pwd.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
32 #include <timeconv.h>
33 #include <unistd.h>
34 #include <utmp.h>
35 
36 /*
37  * this is for our list of currently logged in sessions
38  */
39 struct utmp_list {
40 	struct utmp_list *next;
41 	struct utmp usr;
42 };
43 
44 /*
45  * this is for our list of users that are accumulating time.
46  */
47 struct user_list {
48 	struct user_list *next;
49 	char	name[UT_NAMESIZE+1];
50 	time_t	secs;
51 };
52 
53 /*
54  * this is for chosing whether to ignore a login
55  */
56 struct tty_list {
57 	struct tty_list *next;
58 	char	name[UT_LINESIZE+3];
59 	int	len;
60 	int	ret;
61 };
62 
63 /*
64  * globals - yes yuk
65  */
66 #ifdef CONSOLE_TTY
67 static char 	*Console = CONSOLE_TTY;
68 #endif
69 static time_t	Total = 0;
70 static time_t	FirstTime = 0;
71 static int	Flags = 0;
72 static struct user_list *Users = NULL;
73 static struct tty_list *Ttys = NULL;
74 
75 #define NEW(type) (type *)malloc(sizeof (type))
76 
77 #define	AC_W	1				/* not _PATH_WTMP */
78 #define	AC_D	2				/* daily totals (ignore -p) */
79 #define	AC_P	4				/* per-user totals */
80 #define	AC_U	8				/* specified users only */
81 #define	AC_T	16				/* specified ttys only */
82 
83 #ifdef DEBUG
84 static int Debug = 0;
85 #endif
86 
87 int			main(int, char **);
88 int			ac(FILE *);
89 struct tty_list		*add_tty(char *);
90 int			do_tty(char *);
91 FILE			*file(const char *);
92 struct utmp_list	*log_in(struct utmp_list *, struct utmp *);
93 struct utmp_list	*log_out(struct utmp_list *, struct utmp *);
94 int			on_console(struct utmp_list *);
95 void			show(const char *, time_t);
96 void			show_today(struct user_list *, struct utmp_list *,
97 			    time_t);
98 void			show_users(struct user_list *);
99 struct user_list	*update_user(struct user_list *, char *, time_t);
100 void			usage(void);
101 
102 /*
103  * open wtmp or die
104  */
105 FILE *
106 file(name)
107 	const char *name;
108 {
109 	FILE *fp;
110 
111 	if ((fp = fopen(name, "r")) == NULL)
112 		err(1, "%s", name);
113 	/* in case we want to discriminate */
114 	if (strcmp(_PATH_WTMP, name))
115 		Flags |= AC_W;
116 	return fp;
117 }
118 
119 struct tty_list *
120 add_tty(name)
121 	char *name;
122 {
123 	struct tty_list *tp;
124 	register char *rcp;
125 
126 	Flags |= AC_T;
127 
128 	if ((tp = NEW(struct tty_list)) == NULL)
129 		errx(1, "malloc failed");
130 	tp->len = 0;				/* full match */
131 	tp->ret = 1;				/* do if match */
132 	if (*name == '!') {			/* don't do if match */
133 		tp->ret = 0;
134 		name++;
135 	}
136 	strlcpy(tp->name, name, sizeof (tp->name));
137 	if ((rcp = strchr(tp->name, '*')) != NULL) {	/* wild card */
138 		*rcp = '\0';
139 		tp->len = strlen(tp->name);	/* match len bytes only */
140 	}
141 	tp->next = Ttys;
142 	Ttys = tp;
143 	return Ttys;
144 }
145 
146 /*
147  * should we process the named tty?
148  */
149 int
150 do_tty(name)
151 	char *name;
152 {
153 	struct tty_list *tp;
154 	int def_ret = 0;
155 
156 	for (tp = Ttys; tp != NULL; tp = tp->next) {
157 		if (tp->ret == 0)		/* specific don't */
158 			def_ret = 1;		/* default do */
159 		if (tp->len != 0) {
160 			if (strncmp(name, tp->name, tp->len) == 0)
161 				return tp->ret;
162 		} else {
163 			if (strncmp(name, tp->name, sizeof (tp->name)) == 0)
164 				return tp->ret;
165 		}
166 	}
167 	return def_ret;
168 }
169 
170 #ifdef CONSOLE_TTY
171 /*
172  * is someone logged in on Console?
173  */
174 int
175 on_console(head)
176 	struct utmp_list *head;
177 {
178 	struct utmp_list *up;
179 
180 	for (up = head; up; up = up->next) {
181 		if (strncmp(up->usr.ut_line, Console,
182 		    sizeof (up->usr.ut_line)) == 0)
183 			return 1;
184 	}
185 	return 0;
186 }
187 #endif
188 
189 /*
190  * update user's login time
191  */
192 struct user_list *
193 update_user(head, name, secs)
194 	struct user_list *head;
195 	char	*name;
196 	time_t	secs;
197 {
198 	struct user_list *up;
199 
200 	for (up = head; up != NULL; up = up->next) {
201 		if (strncmp(up->name, name, UT_NAMESIZE) == 0) {
202 			up->secs += secs;
203 			Total += secs;
204 			return head;
205 		}
206 	}
207 	/*
208 	 * not found so add new user unless specified users only
209 	 */
210 	if (Flags & AC_U)
211 		return head;
212 
213 	if ((up = NEW(struct user_list)) == NULL)
214 		errx(1, "malloc failed");
215 	up->next = head;
216 	strlcpy(up->name, name, sizeof (up->name));
217 	up->secs = secs;
218 	Total += secs;
219 	return up;
220 }
221 
222 int
223 main(argc, argv)
224 	int	argc;
225 	char	**argv;
226 {
227 	FILE *fp;
228 	int c;
229 
230 	(void) setlocale(LC_TIME, "");
231 
232 	fp = NULL;
233 	while ((c = getopt(argc, argv, "Dc:dpt:w:")) != -1) {
234 		switch (c) {
235 #ifdef DEBUG
236 		case 'D':
237 			Debug++;
238 			break;
239 #endif
240 		case 'c':
241 #ifdef CONSOLE_TTY
242 			Console = optarg;
243 #else
244 			usage();		/* XXX */
245 #endif
246 			break;
247 		case 'd':
248 			Flags |= AC_D;
249 			break;
250 		case 'p':
251 			Flags |= AC_P;
252 			break;
253 		case 't':			/* only do specified ttys */
254 			add_tty(optarg);
255 			break;
256 		case 'w':
257 			fp = file(optarg);
258 			break;
259 		case '?':
260 		default:
261 			usage();
262 			break;
263 		}
264 	}
265 	if (optind < argc) {
266 		/*
267 		 * initialize user list
268 		 */
269 		for (; optind < argc; optind++) {
270 			Users = update_user(Users, argv[optind], 0L);
271 		}
272 		Flags |= AC_U;			/* freeze user list */
273 	}
274 	if (Flags & AC_D)
275 		Flags &= ~AC_P;
276 	if (fp == NULL) {
277 		/*
278 		 * if _PATH_WTMP does not exist, exit quietly
279 		 */
280 		if (access(_PATH_WTMP, 0) != 0 && errno == ENOENT)
281 			return 0;
282 
283 		fp = file(_PATH_WTMP);
284 	}
285 	ac(fp);
286 
287 	return 0;
288 }
289 
290 /*
291  * print login time in decimal hours
292  */
293 void
294 show(name, secs)
295 	const char *name;
296 	time_t secs;
297 {
298 	(void)printf("\t%-*s %8.2f\n", UT_NAMESIZE, name,
299 	    ((double)secs / 3600));
300 }
301 
302 void
303 show_users(list)
304 	struct user_list *list;
305 {
306 	struct user_list *lp;
307 
308 	for (lp = list; lp; lp = lp->next)
309 		show(lp->name, lp->secs);
310 }
311 
312 /*
313  * print total login time for 24hr period in decimal hours
314  */
315 void
316 show_today(users, logins, secs)
317 	struct user_list *users;
318 	struct utmp_list *logins;
319 	time_t secs;
320 {
321 	struct user_list *up;
322 	struct utmp_list *lp;
323 	char date[64];
324 	time_t yesterday = secs - 1;
325 	static int d_first = -1;
326 
327 	if (d_first < 0)
328 		d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
329 	(void)strftime(date, sizeof (date),
330 		       d_first ? "%e %b  total" : "%b %e  total",
331 		       localtime(&yesterday));
332 
333 	/* restore the missing second */
334 	yesterday++;
335 
336 	for (lp = logins; lp != NULL; lp = lp->next) {
337 		secs = yesterday - lp->usr.ut_time;
338 		Users = update_user(Users, lp->usr.ut_name, secs);
339 		lp->usr.ut_time = yesterday;	/* as if they just logged in */
340 	}
341 	secs = 0;
342 	for (up = users; up != NULL; up = up->next) {
343 		secs += up->secs;
344 		up->secs = 0;			/* for next day */
345 	}
346  	if (secs)
347 		(void)printf("%s %11.2f\n", date, ((double)secs / 3600));
348 }
349 
350 /*
351  * log a user out and update their times.
352  * if ut_line is "~", we log all users out as the system has
353  * been shut down.
354  */
355 struct utmp_list *
356 log_out(head, up)
357 	struct utmp_list *head;
358 	struct utmp *up;
359 {
360 	struct utmp_list *lp, *lp2, *tlp;
361 	time_t secs;
362 
363 	for (lp = head, lp2 = NULL; lp != NULL; )
364 		if (*up->ut_line == '~' || strncmp(lp->usr.ut_line, up->ut_line,
365 		    sizeof (up->ut_line)) == 0) {
366 			secs = up->ut_time - lp->usr.ut_time;
367 			Users = update_user(Users, lp->usr.ut_name, secs);
368 #ifdef DEBUG
369 			if (Debug)
370 				printf("%-.*s %-.*s: %-.*s logged out (%2d:%02d:%02d)\n",
371 				    19, ctime(&up->ut_time),
372 				    sizeof (lp->usr.ut_line), lp->usr.ut_line,
373 				    sizeof (lp->usr.ut_name), lp->usr.ut_name,
374 				    secs / 3600, (secs % 3600) / 60, secs % 60);
375 #endif
376 			/*
377 			 * now lose it
378 			 */
379 			tlp = lp;
380 			lp = lp->next;
381 			if (tlp == head)
382 				head = lp;
383 			else if (lp2 != NULL)
384 				lp2->next = lp;
385 			free(tlp);
386 		} else {
387 			lp2 = lp;
388 			lp = lp->next;
389 		}
390 	return head;
391 }
392 
393 
394 /*
395  * if do_tty says ok, login a user
396  */
397 struct utmp_list *
398 log_in(head, up)
399 	struct utmp_list *head;
400 	struct utmp *up;
401 {
402 	struct utmp_list *lp;
403 
404 	/*
405 	 * this could be a login. if we're not dealing with
406 	 * the console name, say it is.
407 	 *
408 	 * If we are, and if ut_host==":0.0" we know that it
409 	 * isn't a real login. _But_ if we have not yet recorded
410 	 * someone being logged in on Console - due to the wtmp
411 	 * file starting after they logged in, we'll pretend they
412 	 * logged in, at the start of the wtmp file.
413 	 */
414 
415 #ifdef CONSOLE_TTY
416 	if (up->ut_host[0] == ':') {
417 		/*
418 		 * SunOS 4.0.2 does not treat ":0.0" as special but we
419 		 * do.
420 		 */
421 		if (on_console(head))
422 			return head;
423 		/*
424 		 * ok, no recorded login, so they were here when wtmp
425 		 * started!  Adjust ut_time!
426 		 */
427 		up->ut_time = FirstTime;
428 		/*
429 		 * this allows us to pick the right logout
430 		 */
431 		strlcpy(up->ut_line, Console, sizeof (up->ut_line));
432 	}
433 #endif
434 	/*
435 	 * If we are doing specified ttys only, we ignore
436 	 * anything else.
437 	 */
438 	if (Flags & AC_T)
439 		if (!do_tty(up->ut_line))
440 			return head;
441 
442 	/*
443 	 * go ahead and log them in
444 	 */
445 	if ((lp = NEW(struct utmp_list)) == NULL)
446 		errx(1, "malloc failed");
447 	lp->next = head;
448 	head = lp;
449 	memmove((char *)&lp->usr, (char *)up, sizeof (struct utmp));
450 #ifdef DEBUG
451 	if (Debug) {
452 		printf("%-.*s %-.*s: %-.*s logged in", 19,
453 		    ctime(&lp->usr.ut_time), sizeof (up->ut_line),
454 		       up->ut_line, sizeof (up->ut_name), up->ut_name);
455 		if (*up->ut_host)
456 			printf(" (%-.*s)", sizeof (up->ut_host), up->ut_host);
457 		putchar('\n');
458 	}
459 #endif
460 	return head;
461 }
462 
463 int
464 ac(fp)
465 	FILE	*fp;
466 {
467 	struct utmp_list *lp, *head = NULL;
468 	struct utmp usr;
469 	struct tm *ltm;
470 	time_t secs;
471 	int day = -1;
472 
473 	while (fread((char *)&usr, sizeof(usr), 1, fp) == 1) {
474 		if (!FirstTime)
475 			FirstTime = usr.ut_time;
476 		if (Flags & AC_D) {
477 			time_t t = _int_to_time(usr.ut_time);
478 			ltm = localtime(&t);
479 			if (day >= 0 && day != ltm->tm_yday) {
480 				day = ltm->tm_yday;
481 				/*
482 				 * print yesterday's total
483 				 */
484 				secs = usr.ut_time;
485 				secs -= ltm->tm_sec;
486 				secs -= 60 * ltm->tm_min;
487 				secs -= 3600 * ltm->tm_hour;
488 				show_today(Users, head, secs);
489 			} else
490 				day = ltm->tm_yday;
491 		}
492 		switch(*usr.ut_line) {
493 		case '|':
494 			secs = usr.ut_time;
495 			break;
496 		case '{':
497 			secs -= usr.ut_time;
498 			/*
499 			 * adjust time for those logged in
500 			 */
501 			for (lp = head; lp != NULL; lp = lp->next)
502 				lp->usr.ut_time -= secs;
503 			break;
504 		case '~':			/* reboot or shutdown */
505 			head = log_out(head, &usr);
506 			FirstTime = usr.ut_time; /* shouldn't be needed */
507 			break;
508 		default:
509 			/*
510 			 * if they came in on tty[p-sP-S]*, then it is only
511 			 * a login session if the ut_host field is non-empty
512 			 */
513 			if (*usr.ut_name) {
514 				if (strncmp(usr.ut_line, "tty", 3) == 0 ||
515 				    strchr("pqrsPQRS", usr.ut_line[3]) != 0 ||
516 				    *usr.ut_host != '\0')
517 					head = log_in(head, &usr);
518 			} else
519 				head = log_out(head, &usr);
520 			break;
521 		}
522 	}
523 	(void)fclose(fp);
524 	if (!(Flags & AC_W))
525 		usr.ut_time = time((time_t *)0);
526 	(void)strcpy(usr.ut_line, "~");
527 
528 	if (Flags & AC_D) {
529 		time_t t = _int_to_time(usr.ut_time);
530 		ltm = localtime(&t);
531 		if (day >= 0 && day != ltm->tm_yday) {
532 			/*
533 			 * print yesterday's total
534 			 */
535 			secs = usr.ut_time;
536 			secs -= ltm->tm_sec;
537 			secs -= 60 * ltm->tm_min;
538 			secs -= 3600 * ltm->tm_hour;
539 			show_today(Users, head, secs);
540 		}
541 	}
542 	/*
543 	 * anyone still logged in gets time up to now
544 	 */
545 	head = log_out(head, &usr);
546 
547 	if (Flags & AC_D)
548 		show_today(Users, head, time((time_t *)0));
549 	else {
550 		if (Flags & AC_P)
551 			show_users(Users);
552 		show("total", Total);
553 	}
554 	return 0;
555 }
556 
557 void
558 usage()
559 {
560 	(void)fprintf(stderr,
561 #ifdef CONSOLE_TTY
562 	    "ac [-dp] [-c console] [-t tty] [-w wtmp] [users ...]\n");
563 #else
564 	    "ac [-dp] [-t tty] [-w wtmp] [users ...]\n");
565 #endif
566 	exit(1);
567 }
568