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ac.c revision 1.3 
      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 char rcsid[] = "$Id: ac.c,v 1.3 1994/05/01 04:39:35 cgd 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 	int	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 NEW(type) (type *)malloc(sizeof (type))
     72 
     73 #define	AC_W	1				/* not _PATH_WTMP */
     74 #define	AC_D	2				/* daily totals (ignore -p) */
     75 #define	AC_P	4				/* per-user totals */
     76 #define	AC_U	8				/* specified users only */
     77 #define	AC_T	16				/* specified ttys only */
     78 
     79 #ifdef DEBUG
     80 static int Debug = 0;
     81 #endif
     82 
     83 int			main __P((int, char **));
     84 int			ac __P((FILE *));
     85 struct tty_list		*add_tty __P((char *));
     86 int			do_tty __P((char *));
     87 FILE			*file __P((char *));
     88 struct utmp_list	*log_in __P((struct utmp_list *, struct utmp *));
     89 struct utmp_list	*log_out __P((struct utmp_list *, struct utmp *));
     90 int			on_console __P((struct utmp_list *));
     91 void			show __P((char *, time_t));
     92 void			show_today __P((struct user_list *, struct utmp_list *,
     93 			    time_t));
     94 void			show_users __P((struct user_list *));
     95 struct user_list	*update_user __P((struct user_list *, char *, time_t));
     96 void			usage __P((void));
     97 
     98 /*
     99  * open wtmp or die
    100  */
    101 FILE *
    102 file(name)
    103 	char *name;
    104 {
    105 	FILE *fp;
    106 
    107 	if ((fp = fopen(name, "r")) == NULL)
    108 		err(1, "%s", name);
    109 	/* in case we want to discriminate */
    110 	if (strcmp(_PATH_WTMP, name))
    111 		Flags |= AC_W;
    112 	return fp;
    113 }
    114 
    115 struct tty_list *
    116 add_tty(name)
    117 	char *name;
    118 {
    119 	struct tty_list *tp;
    120 	register char *rcp;
    121 
    122 	Flags |= AC_T;
    123 
    124 	if ((tp = NEW(struct tty_list)) == NULL)
    125 		err(1, "malloc");
    126 	tp->len = 0;				/* full match */
    127 	tp->ret = 1;				/* do if match */
    128 	if (*name == '!') {			/* don't do if match */
    129 		tp->ret = 0;
    130 		name++;
    131 	}
    132 	(void)strncpy(tp->name, name, sizeof (tp->name) - 1);
    133 	tp->name[sizeof (tp->name) - 1] = '\0';
    134 	if ((rcp = strchr(tp->name, '*')) != NULL) {	/* wild card */
    135 		*rcp = '\0';
    136 		tp->len = strlen(tp->name);	/* match len bytes only */
    137 	}
    138 	tp->next = Ttys;
    139 	Ttys = tp;
    140 	return Ttys;
    141 }
    142 
    143 /*
    144  * should we process the named tty?
    145  */
    146 int
    147 do_tty(name)
    148 	char *name;
    149 {
    150 	struct tty_list *tp;
    151 	int def_ret = 0;
    152 
    153 	for (tp = Ttys; tp != NULL; tp = tp->next) {
    154 		if (tp->ret == 0)		/* specific don't */
    155 			def_ret = 1;		/* default do */
    156 		if (tp->len != 0) {
    157 			if (strncmp(name, tp->name, tp->len) == 0)
    158 				return tp->ret;
    159 		} else {
    160 			if (strncmp(name, tp->name, sizeof (tp->name)) == 0)
    161 				return tp->ret;
    162 		}
    163 	}
    164 	return def_ret;
    165 }
    166 
    167 #ifdef CONSOLE_TTY
    168 /*
    169  * is someone logged in on Console?
    170  */
    171 int
    172 on_console(head)
    173 	struct utmp_list *head;
    174 {
    175 	struct utmp_list *up;
    176 
    177 	for (up = head; up; up = up->next) {
    178 		if (strncmp(up->usr.ut_line, Console,
    179 		    sizeof (up->usr.ut_line)) == 0)
    180 			return 1;
    181 	}
    182 	return 0;
    183 }
    184 #endif
    185 
    186 /*
    187  * update user's login time
    188  */
    189 struct user_list *
    190 update_user(head, name, secs)
    191 	struct user_list *head;
    192 	char	*name;
    193 	time_t	secs;
    194 {
    195 	struct user_list *up;
    196 
    197 	for (up = head; up != NULL; up = up->next) {
    198 		if (strncmp(up->name, name, sizeof (up->name)) == 0) {
    199 			up->secs += secs;
    200 			Total += secs;
    201 			return head;
    202 		}
    203 	}
    204 	/*
    205 	 * not found so add new user unless specified users only
    206 	 */
    207 	if (Flags & AC_U)
    208 		return head;
    209 
    210 	if ((up = NEW(struct user_list)) == NULL)
    211 		err(1, "malloc");
    212 	up->next = head;
    213 	(void)strncpy(up->name, name, sizeof (up->name) - 1);
    214 	up->name[sizeof (up->name) - 1] = '\0';	/* paranoid! */
    215 	up->secs = secs;
    216 	Total += secs;
    217 	return up;
    218 }
    219 
    220 int
    221 main(argc, argv)
    222 	int	argc;
    223 	char	**argv;
    224 {
    225 	FILE *fp;
    226 	int c;
    227 
    228 	fp = NULL;
    229 	while ((c = getopt(argc, argv, "Dc:dpt:w:")) != EOF) {
    230 		switch (c) {
    231 #ifdef DEBUG
    232 		case 'D':
    233 			Debug++;
    234 			break;
    235 #endif
    236 		case 'c':
    237 #ifdef CONSOLE_TTY
    238 			Console = optarg;
    239 #else
    240 			usage();		/* XXX */
    241 #endif
    242 			break;
    243 		case 'd':
    244 			Flags |= AC_D;
    245 			break;
    246 		case 'p':
    247 			Flags |= AC_P;
    248 			break;
    249 		case 't':			/* only do specified ttys */
    250 			add_tty(optarg);
    251 			break;
    252 		case 'w':
    253 			fp = file(optarg);
    254 			break;
    255 		case '?':
    256 		default:
    257 			usage();
    258 			break;
    259 		}
    260 	}
    261 	if (optind < argc) {
    262 		/*
    263 		 * initialize user list
    264 		 */
    265 		for (; optind < argc; optind++) {
    266 			Users = update_user(Users, argv[optind], 0L);
    267 		}
    268 		Flags |= AC_U;			/* freeze user list */
    269 	}
    270 	if (Flags & AC_D)
    271 		Flags &= ~AC_P;
    272 	if (fp == NULL) {
    273 		/*
    274 		 * if _PATH_WTMP does not exist, exit quietly
    275 		 */
    276 		if (access(_PATH_WTMP, 0) != 0 && errno == ENOENT)
    277 			return 0;
    278 
    279 		fp = file(_PATH_WTMP);
    280 	}
    281 	ac(fp);
    282 
    283 	return 0;
    284 }
    285 
    286 /*
    287  * print login time in decimal hours
    288  */
    289 void
    290 show(name, secs)
    291 	char *name;
    292 	time_t secs;
    293 {
    294 	(void)printf("\t%-*s %8.2f\n", UT_NAMESIZE, name,
    295 	    ((double)secs / 3600));
    296 }
    297 
    298 void
    299 show_users(list)
    300 	struct user_list *list;
    301 {
    302 	struct user_list *lp;
    303 
    304 	for (lp = list; lp; lp = lp->next)
    305 		show(lp->name, lp->secs);
    306 }
    307 
    308 /*
    309  * print total login time for 24hr period in decimal hours
    310  */
    311 void
    312 show_today(users, logins, secs)
    313 	struct user_list *users;
    314 	struct utmp_list *logins;
    315 	time_t secs;
    316 {
    317 	struct user_list *up;
    318 	struct utmp_list *lp;
    319 	char date[64];
    320 	time_t yesterday = secs - 1;
    321 
    322 	(void)strftime(date, sizeof (date), "%b %e  total",
    323 	    localtime(&yesterday));
    324 
    325 	/* restore the missing second */
    326 	yesterday++;
    327 
    328 	for (lp = logins; lp != NULL; lp = lp->next) {
    329 		secs = yesterday - lp->usr.ut_time;
    330 		Users = update_user(Users, lp->usr.ut_name, secs);
    331 		lp->usr.ut_time = yesterday;	/* as if they just logged in */
    332 	}
    333 	secs = 0;
    334 	for (up = users; up != NULL; up = up->next) {
    335 		secs += up->secs;
    336 		up->secs = 0;			/* for next day */
    337 	}
    338  	if (secs)
    339 		(void)printf("%s %11.2f\n", date, ((double)secs / 3600));
    340 }
    341 
    342 /*
    343  * log a user out and update their times.
    344  * if ut_line is "~", we log all users out as the system has
    345  * been shut down.
    346  */
    347 struct utmp_list *
    348 log_out(head, up)
    349 	struct utmp_list *head;
    350 	struct utmp *up;
    351 {
    352 	struct utmp_list *lp, *lp2, *tlp;
    353 	time_t secs;
    354 
    355 	for (lp = head, lp2 = NULL; lp != NULL; )
    356 		if (*up->ut_line == '~' || strncmp(lp->usr.ut_line, up->ut_line,
    357 		    sizeof (up->ut_line)) == 0) {
    358 			secs = up->ut_time - lp->usr.ut_time;
    359 			Users = update_user(Users, lp->usr.ut_name, secs);
    360 #ifdef DEBUG
    361 			if (Debug)
    362 				printf("%-.*s %-.*s: %-.*s logged out (%2d:%02d:%02d)\n",
    363 				    19, ctime(&up->ut_time),
    364 				    sizeof (lp->usr.ut_line), lp->usr.ut_line,
    365 				    sizeof (lp->usr.ut_name), lp->usr.ut_name,
    366 				    secs / 3600, (secs % 3600) / 60, secs % 60);
    367 #endif
    368 			/*
    369 			 * now lose it
    370 			 */
    371 			tlp = lp;
    372 			lp = lp->next;
    373 			if (tlp == head)
    374 				head = lp;
    375 			else if (lp2 != NULL)
    376 				lp2->next = lp;
    377 			free(tlp);
    378 		} else {
    379 			lp2 = lp;
    380 			lp = lp->next;
    381 		}
    382 	return head;
    383 }
    384 
    385 
    386 /*
    387  * if do_tty says ok, login a user
    388  */
    389 struct utmp_list *
    390 log_in(head, up)
    391 	struct utmp_list *head;
    392 	struct utmp *up;
    393 {
    394 	struct utmp_list *lp;
    395 
    396 	/*
    397 	 * this could be a login. if we're not dealing with
    398 	 * the console name, say it is.
    399 	 *
    400 	 * If we are, and if ut_host==":0.0" we know that it
    401 	 * isn't a real login. _But_ if we have not yet recorded
    402 	 * someone being logged in on Console - due to the wtmp
    403 	 * file starting after they logged in, we'll pretend they
    404 	 * logged in, at the start of the wtmp file.
    405 	 */
    406 
    407 #ifdef CONSOLE_TTY
    408 	if (up->ut_host[0] == ':') {
    409 		/*
    410 		 * SunOS 4.0.2 does not treat ":0.0" as special but we
    411 		 * do.
    412 		 */
    413 		if (on_console(head))
    414 			return head;
    415 		/*
    416 		 * ok, no recorded login, so they were here when wtmp
    417 		 * started!  Adjust ut_time!
    418 		 */
    419 		up->ut_time = FirstTime;
    420 		/*
    421 		 * this allows us to pick the right logout
    422 		 */
    423 		(void)strncpy(up->ut_line, Console, sizeof (up->ut_line) - 1);
    424 		up->ut_line[sizeof (up->ut_line) - 1] = '\0'; /* paranoid! */
    425 	}
    426 #endif
    427 	/*
    428 	 * If we are doing specified ttys only, we ignore
    429 	 * anything else.
    430 	 */
    431 	if (Flags & AC_T)
    432 		if (!do_tty(up->ut_line))
    433 			return head;
    434 
    435 	/*
    436 	 * go ahead and log them in
    437 	 */
    438 	if ((lp = NEW(struct utmp_list)) == NULL)
    439 		err(1, "malloc");
    440 	lp->next = head;
    441 	head = lp;
    442 	memmove((char *)&lp->usr, (char *)up, sizeof (struct utmp));
    443 #ifdef DEBUG
    444 	if (Debug) {
    445 		printf("%-.*s %-.*s: %-.*s logged in", 19,
    446 		    ctime(&lp->usr.ut_time), sizeof (up->ut_line),
    447 		       up->ut_line, sizeof (up->ut_name), up->ut_name);
    448 		if (*up->ut_host)
    449 			printf(" (%-.*s)", sizeof (up->ut_host), up->ut_host);
    450 		putchar('\n');
    451 	}
    452 #endif
    453 	return head;
    454 }
    455 
    456 int
    457 ac(fp)
    458 	FILE	*fp;
    459 {
    460 	struct utmp_list *lp, *head = NULL;
    461 	struct utmp usr;
    462 	struct tm *ltm;
    463 	time_t secs;
    464 	int day = -1;
    465 
    466 	while (fread((char *)&usr, sizeof(usr), 1, fp) == 1) {
    467 		if (!FirstTime)
    468 			FirstTime = usr.ut_time;
    469 		if (Flags & AC_D) {
    470 			ltm = localtime(&usr.ut_time);
    471 			if (day >= 0 && day != ltm->tm_yday) {
    472 				day = ltm->tm_yday;
    473 				/*
    474 				 * print yesterday's total
    475 				 */
    476 				secs = usr.ut_time;
    477 				secs -= ltm->tm_sec;
    478 				secs -= 60 * ltm->tm_min;
    479 				secs -= 3600 * ltm->tm_hour;
    480 				show_today(Users, head, secs);
    481 			} else
    482 				day = ltm->tm_yday;
    483 		}
    484 		switch(*usr.ut_line) {
    485 		case '|':
    486 			secs = usr.ut_time;
    487 			break;
    488 		case '{':
    489 			secs -= usr.ut_time;
    490 			/*
    491 			 * adjust time for those logged in
    492 			 */
    493 			for (lp = head; lp != NULL; lp = lp->next)
    494 				lp->usr.ut_time -= secs;
    495 			break;
    496 		case '~':			/* reboot or shutdown */
    497 			head = log_out(head, &usr);
    498 			FirstTime = usr.ut_time; /* shouldn't be needed */
    499 			break;
    500 		default:
    501 			/*
    502 			 * if they came in on tty[p-y]*, then it is only
    503 			 * a login session if the ut_host field is non-empty
    504 			 */
    505 			if (*usr.ut_name) {
    506 				if (strncmp(usr.ut_line, "tty", 3) != 0 ||
    507 				    strchr("pqrstuvwxy", usr.ut_line[3]) == 0 ||
    508 				    *usr.ut_host != '\0')
    509 					head = log_in(head, &usr);
    510 			} else
    511 				head = log_out(head, &usr);
    512 			break;
    513 		}
    514 	}
    515 	(void)fclose(fp);
    516 	usr.ut_time = time((time_t *)0);
    517 	(void)strcpy(usr.ut_line, "~");
    518 
    519 	if (Flags & AC_D) {
    520 		ltm = localtime(&usr.ut_time);
    521 		if (day >= 0 && day != ltm->tm_yday) {
    522 			/*
    523 			 * print yesterday's total
    524 			 */
    525 			secs = usr.ut_time;
    526 			secs -= ltm->tm_sec;
    527 			secs -= 60 * ltm->tm_min;
    528 			secs -= 3600 * ltm->tm_hour;
    529 			show_today(Users, head, secs);
    530 		}
    531 	}
    532 	/*
    533 	 * anyone still logged in gets time up to now
    534 	 */
    535 	head = log_out(head, &usr);
    536 
    537 	if (Flags & AC_D)
    538 		show_today(Users, head, time((time_t *)0));
    539 	else {
    540 		if (Flags & AC_P)
    541 			show_users(Users);
    542 		show("total", Total);
    543 	}
    544 	return 0;
    545 }
    546 
    547 void
    548 usage()
    549 {
    550 	(void)fprintf(stderr,
    551 #ifdef CONSOLE_TTY
    552 	    "ac [-dp] [-c console] [-t tty] [-w wtmp] [users ...]\n");
    553 #else
    554 	    "ac [-dp] [-t tty] [-w wtmp] [users ...]\n");
    555 #endif
    556 	exit(1);
    557 }
    558