xref: /openbsd-src/usr.sbin/ac/ac.c (revision a28daedfc357b214be5c701aa8ba8adb29a7f1c2) 
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[] = "$OpenBSD: ac.c,v 1.19 2007/11/17 15:08:57 sobrado Exp $";
18 #endif
19 
20 #include <sys/types.h>
21 #include <sys/file.h>
22 #include <sys/time.h>
23 #include <err.h>
24 #include <errno.h>
25 #include <pwd.h>
26 #include <stdio.h>
27 #include <stdlib.h>
28 #include <string.h>
29 #include <utmp.h>
30 #include <unistd.h>
31 
32 /*
33  * this is for our list of currently logged in sessions
34  */
35 struct utmp_list {
36 	struct utmp_list *next;
37 	struct utmp usr;
38 };
39 
40 /*
41  * this is for our list of users that are accumulating time.
42  */
43 struct user_list {
44 	struct user_list *next;
45 	char	name[UT_NAMESIZE+1];
46 	time_t	secs;
47 };
48 
49 /*
50  * this is for chosing whether to ignore a login
51  */
52 struct tty_list {
53 	struct tty_list *next;
54 	char	name[UT_LINESIZE+3];
55 	size_t	len;
56 	int	ret;
57 };
58 
59 /*
60  * globals - yes yuk
61  */
62 #ifdef CONSOLE_TTY
63 static char	*Console = CONSOLE_TTY;
64 #endif
65 static time_t	Total = 0;
66 static time_t	FirstTime = 0;
67 static int	Flags = 0;
68 static struct user_list *Users = NULL;
69 static struct tty_list *Ttys = NULL;
70 
71 #define	AC_W	1				/* not _PATH_WTMP */
72 #define	AC_D	2				/* daily totals (ignore -p) */
73 #define	AC_P	4				/* per-user totals */
74 #define	AC_U	8				/* specified users only */
75 #define	AC_T	16				/* specified ttys only */
76 
77 #ifdef DEBUG
78 static int Debug = 0;
79 #endif
80 
81 int			main(int, char **);
82 int			ac(FILE *);
83 void			add_tty(char *);
84 int			do_tty(char *);
85 FILE			*file(char *);
86 struct utmp_list	*log_in(struct utmp_list *, struct utmp *);
87 struct utmp_list	*log_out(struct utmp_list *, struct utmp *);
88 int			on_console(struct utmp_list *);
89 void			show(char *, time_t);
90 void			show_today(struct user_list *, struct utmp_list *,
91 			    time_t);
92 void			show_users(struct user_list *);
93 struct user_list	*update_user(struct user_list *, char *, time_t);
94 void			usage(void);
95 
96 /*
97  * open wtmp or die
98  */
99 FILE *
100 file(char *name)
101 {
102 	FILE *fp;
103 
104 	if (strcmp(name, "-") == 0)
105 		fp = stdin;
106 	else if ((fp = fopen(name, "r")) == NULL)
107 		err(1, "%s", name);
108 	/* in case we want to discriminate */
109 	if (strcmp(_PATH_WTMP, name))
110 		Flags |= AC_W;
111 	return fp;
112 }
113 
114 void
115 add_tty(char *name)
116 {
117 	struct tty_list *tp;
118 	char *rcp;
119 
120 	Flags |= AC_T;
121 
122 	if ((tp = malloc(sizeof(struct tty_list))) == NULL)
123 		err(1, "malloc");
124 	tp->len = 0;				/* full match */
125 	tp->ret = 1;				/* do if match */
126 	if (*name == '!') {			/* don't do if match */
127 		tp->ret = 0;
128 		name++;
129 	}
130 	strlcpy(tp->name, name, sizeof (tp->name));
131 	if ((rcp = strchr(tp->name, '*')) != NULL) {	/* wild card */
132 		*rcp = '\0';
133 		tp->len = strlen(tp->name);	/* match len bytes only */
134 	}
135 	tp->next = Ttys;
136 	Ttys = tp;
137 }
138 
139 /*
140  * should we process the named tty?
141  */
142 int
143 do_tty(char *name)
144 {
145 	struct tty_list *tp;
146 	int def_ret = 0;
147 
148 	for (tp = Ttys; tp != NULL; tp = tp->next) {
149 		if (tp->ret == 0)		/* specific don't */
150 			def_ret = 1;		/* default do */
151 		if (tp->len != 0) {
152 			if (strncmp(name, tp->name, tp->len) == 0)
153 				return tp->ret;
154 		} else {
155 			if (strncmp(name, tp->name, sizeof (tp->name)) == 0)
156 				return tp->ret;
157 		}
158 	}
159 	return def_ret;
160 }
161 
162 #ifdef CONSOLE_TTY
163 /*
164  * is someone logged in on Console?
165  */
166 int
167 on_console(struct utmp_list *head)
168 {
169 	struct utmp_list *up;
170 
171 	for (up = head; up; up = up->next) {
172 		if (strncmp(up->usr.ut_line, Console,
173 		    sizeof (up->usr.ut_line)) == 0)
174 			return 1;
175 	}
176 	return 0;
177 }
178 #endif
179 
180 /*
181  * update user's login time
182  */
183 struct user_list *
184 update_user(struct user_list *head, char *name, time_t secs)
185 {
186 	struct user_list *up;
187 
188 	for (up = head; up != NULL; up = up->next) {
189 		if (strncmp(up->name, name, sizeof (up->name) - 1) == 0) {
190 			up->secs += secs;
191 			Total += secs;
192 			return head;
193 		}
194 	}
195 	/*
196 	 * not found so add new user unless specified users only
197 	 */
198 	if (Flags & AC_U)
199 		return head;
200 
201 	if ((up = malloc(sizeof(struct user_list))) == NULL)
202 		err(1, "malloc");
203 	up->next = head;
204 	strlcpy(up->name, name, sizeof (up->name));
205 	up->secs = secs;
206 	Total += secs;
207 	return up;
208 }
209 
210 int
211 main(int argc, char *argv[])
212 {
213 	FILE *fp;
214 	int c;
215 
216 	fp = NULL;
217 	while ((c = getopt(argc, argv, "Dc:dpt:w:")) != -1) {
218 		switch (c) {
219 #ifdef DEBUG
220 		case 'D':
221 			Debug++;
222 			break;
223 #endif
224 		case 'c':
225 #ifdef CONSOLE_TTY
226 			Console = optarg;
227 #else
228 			usage();		/* XXX */
229 #endif
230 			break;
231 		case 'd':
232 			Flags |= AC_D;
233 			break;
234 		case 'p':
235 			Flags |= AC_P;
236 			break;
237 		case 't':			/* only do specified ttys */
238 			add_tty(optarg);
239 			break;
240 		case 'w':
241 			fp = file(optarg);
242 			break;
243 		case '?':
244 		default:
245 			usage();
246 			break;
247 		}
248 	}
249 	if (optind < argc) {
250 		/*
251 		 * initialize user list
252 		 */
253 		for (; optind < argc; optind++) {
254 			Users = update_user(Users, argv[optind], 0L);
255 		}
256 		Flags |= AC_U;			/* freeze user list */
257 	}
258 	if (Flags & AC_D)
259 		Flags &= ~AC_P;
260 	if (fp == NULL) {
261 		/*
262 		 * if _PATH_WTMP does not exist, exit quietly
263 		 */
264 		if (access(_PATH_WTMP, 0) != 0 && errno == ENOENT)
265 			return 0;
266 
267 		fp = file(_PATH_WTMP);
268 	}
269 	ac(fp);
270 
271 	return 0;
272 }
273 
274 /*
275  * print login time in decimal hours
276  */
277 void
278 show(char *name, time_t secs)
279 {
280 	(void)printf("\t%-*s %8.2f\n", UT_NAMESIZE, name,
281 	    ((double)secs / 3600));
282 }
283 
284 void
285 show_users(struct user_list *list)
286 {
287 	struct user_list *lp;
288 
289 	for (lp = list; lp; lp = lp->next)
290 		show(lp->name, lp->secs);
291 }
292 
293 /*
294  * print total login time for 24hr period in decimal hours
295  */
296 void
297 show_today(struct user_list *users, struct utmp_list *logins, time_t secs)
298 {
299 	struct user_list *up;
300 	struct utmp_list *lp;
301 	char date[64];
302 	time_t yesterday = secs - 1;
303 
304 	(void)strftime(date, sizeof (date), "%b %e  total",
305 	    localtime(&yesterday));
306 
307 	/* restore the missing second */
308 	yesterday++;
309 
310 	for (lp = logins; lp != NULL; lp = lp->next) {
311 		secs = yesterday - lp->usr.ut_time;
312 		Users = update_user(Users, lp->usr.ut_name, secs);
313 		lp->usr.ut_time = yesterday;	/* as if they just logged in */
314 	}
315 	secs = 0;
316 	for (up = users; up != NULL; up = up->next) {
317 		secs += up->secs;
318 		up->secs = 0;			/* for next day */
319 	}
320 	if (secs)
321 		(void)printf("%s %11.2f\n", date, ((double)secs / 3600));
322 }
323 
324 /*
325  * log a user out and update their times.
326  * if ut_line is "~", we log all users out as the system has
327  * been shut down.
328  */
329 struct utmp_list *
330 log_out(struct utmp_list *head, struct utmp *up)
331 {
332 	struct utmp_list *lp, *lp2, *tlp;
333 	time_t secs;
334 
335 	for (lp = head, lp2 = NULL; lp != NULL; )
336 		if (*up->ut_line == '~' || strncmp(lp->usr.ut_line, up->ut_line,
337 		    sizeof (up->ut_line)) == 0) {
338 			secs = up->ut_time - lp->usr.ut_time;
339 			Users = update_user(Users, lp->usr.ut_name, secs);
340 #ifdef DEBUG
341 			if (Debug)
342 				printf("%-.*s %-.*s: %-.*s logged out (%2d:%02d:%02d)\n",
343 				    19, ctime(&up->ut_time),
344 				    sizeof (lp->usr.ut_line), lp->usr.ut_line,
345 				    sizeof (lp->usr.ut_name), lp->usr.ut_name,
346 				    secs / 3600, (secs % 3600) / 60, secs % 60);
347 #endif
348 			/*
349 			 * now lose it
350 			 */
351 			tlp = lp;
352 			lp = lp->next;
353 			if (tlp == head)
354 				head = lp;
355 			else if (lp2 != NULL)
356 				lp2->next = lp;
357 			free(tlp);
358 		} else {
359 			lp2 = lp;
360 			lp = lp->next;
361 		}
362 	return head;
363 }
364 
365 
366 /*
367  * if do_tty says ok, login a user
368  */
369 struct utmp_list *
370 log_in(struct utmp_list *head, struct utmp *up)
371 {
372 	struct utmp_list *lp;
373 
374 	/*
375 	 * this could be a login. if we're not dealing with
376 	 * the console name, say it is.
377 	 *
378 	 * If we are, and if ut_host==":0.0" we know that it
379 	 * isn't a real login. _But_ if we have not yet recorded
380 	 * someone being logged in on Console - due to the wtmp
381 	 * file starting after they logged in, we'll pretend they
382 	 * logged in, at the start of the wtmp file.
383 	 */
384 
385 #ifdef CONSOLE_TTY
386 	if (up->ut_host[0] == ':') {
387 		/*
388 		 * SunOS 4.0.2 does not treat ":0.0" as special but we
389 		 * do.
390 		 */
391 		if (on_console(head))
392 			return head;
393 		/*
394 		 * ok, no recorded login, so they were here when wtmp
395 		 * started!  Adjust ut_time!
396 		 */
397 		up->ut_time = FirstTime;
398 		/*
399 		 * this allows us to pick the right logout
400 		 */
401 		strlcpy(up->ut_line, Console, sizeof (up->ut_line));
402 	}
403 #endif
404 	/*
405 	 * If we are doing specified ttys only, we ignore
406 	 * anything else.
407 	 */
408 	if (Flags & AC_T)
409 		if (!do_tty(up->ut_line))
410 			return head;
411 
412 	/*
413 	 * go ahead and log them in
414 	 */
415 	if ((lp = malloc(sizeof(struct utmp_list))) == NULL)
416 		err(1, "malloc");
417 	lp->next = head;
418 	head = lp;
419 	memmove((char *)&lp->usr, (char *)up, sizeof (struct utmp));
420 #ifdef DEBUG
421 	if (Debug) {
422 		printf("%-.*s %-.*s: %-.*s logged in", 19,
423 		    ctime(&lp->usr.ut_time), sizeof (up->ut_line),
424 		    up->ut_line, sizeof (up->ut_name), up->ut_name);
425 		if (*up->ut_host)
426 			printf(" (%-.*s)", sizeof (up->ut_host), up->ut_host);
427 		putchar('\n');
428 	}
429 #endif
430 	return head;
431 }
432 
433 int
434 ac(FILE	*fp)
435 {
436 	struct utmp_list *lp, *head = NULL;
437 	struct utmp usr;
438 	struct tm *ltm;
439 	time_t secs = 0, prev = 0;
440 	int day = -1;
441 
442 	while (fread((char *)&usr, sizeof(usr), 1, fp) == 1) {
443 		if (!FirstTime)
444 			FirstTime = usr.ut_time;
445 		if (usr.ut_time < prev)
446 			continue;	/* broken record */
447 		prev = usr.ut_time;
448 		if (Flags & AC_D) {
449 			ltm = localtime(&usr.ut_time);
450 			if (day >= 0 && day != ltm->tm_yday) {
451 				day = ltm->tm_yday;
452 				/*
453 				 * print yesterday's total
454 				 */
455 				secs = usr.ut_time;
456 				secs -= ltm->tm_sec;
457 				secs -= 60 * ltm->tm_min;
458 				secs -= 3600 * ltm->tm_hour;
459 				show_today(Users, head, secs);
460 			} else
461 				day = ltm->tm_yday;
462 		}
463 		switch(*usr.ut_line) {
464 		case '|':
465 			secs = usr.ut_time;
466 			break;
467 		case '{':
468 			secs -= usr.ut_time;
469 			/*
470 			 * adjust time for those logged in
471 			 */
472 			for (lp = head; lp != NULL; lp = lp->next)
473 				lp->usr.ut_time -= secs;
474 			break;
475 		case '~':			/* reboot or shutdown */
476 			head = log_out(head, &usr);
477 			FirstTime = usr.ut_time; /* shouldn't be needed */
478 			break;
479 		default:
480 			/*
481 			 * if they came in on a pseudo-tty, then it is only
482 			 * a login session if the ut_host field is non-empty
483 			 */
484 			if (*usr.ut_name) {
485 				if (strncmp(usr.ut_line, "tty", 3) != 0 ||
486 				    strchr("pqrstuvwxyzPQRST", usr.ut_line[3]) != NULL ||
487 				    *usr.ut_host != '\0')
488 					head = log_in(head, &usr);
489 			} else
490 				head = log_out(head, &usr);
491 			break;
492 		}
493 	}
494 	(void)fclose(fp);
495 	if (!(Flags & AC_W))
496 		usr.ut_time = time(NULL);
497 	(void)strlcpy(usr.ut_line, "~", sizeof usr.ut_line);
498 
499 	if (Flags & AC_D) {
500 		ltm = localtime(&usr.ut_time);
501 		if (day >= 0 && day != ltm->tm_yday) {
502 			/*
503 			 * print yesterday's total
504 			 */
505 			secs = usr.ut_time;
506 			secs -= ltm->tm_sec;
507 			secs -= 60 * ltm->tm_min;
508 			secs -= 3600 * ltm->tm_hour;
509 			show_today(Users, head, secs);
510 		}
511 	}
512 	/*
513 	 * anyone still logged in gets time up to now
514 	 */
515 	head = log_out(head, &usr);
516 
517 	if (Flags & AC_D)
518 		show_today(Users, head, time(NULL));
519 	else {
520 		if (Flags & AC_P)
521 			show_users(Users);
522 		show("total", Total);
523 	}
524 	return 0;
525 }
526 
527 void
528 usage(void)
529 {
530 	extern char *__progname;
531 	(void)fprintf(stderr, "usage: "
532 #ifdef CONSOLE_TTY
533 	    "%s [-dp] [-c console] [-t tty] [-w wtmp] [user ...]\n",
534 	    __progname);
535 #else
536 	    "%s [-dp] [-t tty] [-w wtmp] [user ...]\n", __progname);
537 #endif
538 	exit(1);
539 }
540