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ac.c revision 1.2 
      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 1.2 1994/04/25 18:11:32 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+1];
     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));
    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 (strcmp(name, 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 (strcmp(up->usr.ut_line, Console) == 0)
    179 			return 1;
    180 	}
    181 	return 0;
    182 }
    183 #endif
    184 
    185 /*
    186  * update user's login time
    187  */
    188 struct user_list *
    189 update_user(head, name, secs)
    190 	struct user_list *head;
    191 	char	*name;
    192 	time_t	secs;
    193 {
    194 	struct user_list *up;
    195 
    196 	for (up = head; up != NULL; up = up->next) {
    197 		if (strcmp(up->name, name) == 0) {
    198 			up->secs += secs;
    199 			Total += secs;
    200 			return head;
    201 		}
    202 	}
    203 	/*
    204 	 * not found so add new user unless specified users only
    205 	 */
    206 	if (Flags & AC_U)
    207 		return head;
    208 
    209 	if ((up = NEW(struct user_list)) == NULL)
    210 		err(1, "malloc");
    211 	up->next = head;
    212 	(void)strncpy(up->name, name, sizeof (up->name) - 1);
    213 	up->name[sizeof (up->name) - 1] = '\0';	/* paranoid! */
    214 	up->secs = secs;
    215 	Total += secs;
    216 	return up;
    217 }
    218 
    219 int
    220 main(argc, argv)
    221 	int	argc;
    222 	char	**argv;
    223 {
    224 	FILE *fp;
    225 	int c;
    226 
    227 	fp = NULL;
    228 	while ((c = getopt(argc, argv, "Dc:dpt:w:")) != EOF) {
    229 		switch (c) {
    230 #ifdef DEBUG
    231 		case 'D':
    232 			Debug++;
    233 			break;
    234 #endif
    235 		case 'c':
    236 #ifdef CONSOLE_TTY
    237 			Console = optarg;
    238 #else
    239 			usage();		/* XXX */
    240 #endif
    241 			break;
    242 		case 'd':
    243 			Flags |= AC_D;
    244 			break;
    245 		case 'p':
    246 			Flags |= AC_P;
    247 			break;
    248 		case 't':			/* only do specified ttys */
    249 			add_tty(optarg);
    250 			break;
    251 		case 'w':
    252 			fp = file(optarg);
    253 			break;
    254 		case '?':
    255 		default:
    256 			usage();
    257 			break;
    258 		}
    259 	}
    260 	if (optind < argc) {
    261 		/*
    262 		 * initialize user list
    263 		 */
    264 		for (; optind < argc; optind++) {
    265 			Users = update_user(Users, argv[optind], 0L);
    266 		}
    267 		Flags |= AC_U;			/* freeze user list */
    268 	}
    269 	if (Flags & AC_D)
    270 		Flags &= ~AC_P;
    271 	if (fp == NULL) {
    272 		/*
    273 		 * if _PATH_WTMP does not exist, exit quietly
    274 		 */
    275 		if (access(_PATH_WTMP, 0) != 0 && errno == ENOENT)
    276 			return 0;
    277 
    278 		fp = file(_PATH_WTMP);
    279 	}
    280 	ac(fp);
    281 
    282 	return 0;
    283 }
    284 
    285 /*
    286  * print login time in decimal hours
    287  */
    288 void
    289 show(name, secs)
    290 	char *name;
    291 	time_t secs;
    292 {
    293 	(void)printf("\t%-*s %8.2f\n", UT_NAMESIZE, name,
    294 	    ((double)secs / 3600));
    295 }
    296 
    297 void
    298 show_users(list)
    299 	struct user_list *list;
    300 {
    301 	struct user_list *lp;
    302 
    303 	for (lp = list; lp; lp = lp->next)
    304 		show(lp->name, lp->secs);
    305 }
    306 
    307 /*
    308  * print total login time for 24hr period in decimal hours
    309  */
    310 void
    311 show_today(users, logins, secs)
    312 	struct user_list *users;
    313 	struct utmp_list *logins;
    314 	time_t secs;
    315 {
    316 	struct user_list *up;
    317 	struct utmp_list *lp;
    318 	char date[64];
    319 	time_t yesterday = secs - 1;
    320 
    321 	(void)strftime(date, sizeof (date), "%b %e  total",
    322 	    localtime(&yesterday));
    323 
    324 	/* restore the missing second */
    325 	yesterday++;
    326 
    327 	for (lp = logins; lp != NULL; lp = lp->next) {
    328 		secs = yesterday - lp->usr.ut_time;
    329 		Users = update_user(Users, lp->usr.ut_name, secs);
    330 		lp->usr.ut_time = yesterday;	/* as if they just logged in */
    331 	}
    332 	secs = 0;
    333 	for (up = users; up != NULL; up = up->next) {
    334 		secs += up->secs;
    335 		up->secs = 0;			/* for next day */
    336 	}
    337  	if (secs)
    338 		(void)printf("%s %11.2f\n", date, ((double)secs / 3600));
    339 }
    340 
    341 /*
    342  * log a user out and update their times.
    343  * if ut_line is "~", we log all users out as the system has
    344  * been shut down.
    345  */
    346 struct utmp_list *
    347 log_out(head, up)
    348 	struct utmp_list *head;
    349 	struct utmp *up;
    350 {
    351 	struct utmp_list *lp, *lp2, *tlp;
    352 	time_t secs;
    353 
    354 	for (lp = head, lp2 = NULL; lp != NULL; )
    355 		if (*up->ut_line == '~' ||
    356 		    strcmp(lp->usr.ut_line, up->ut_line) == 0) {
    357 			secs = up->ut_time - lp->usr.ut_time;
    358 			Users = update_user(Users, lp->usr.ut_name, secs);
    359 #ifdef DEBUG
    360 			if (Debug)
    361 				printf(
    362 				    "%-.*s %s: %s logged out (%2d:%02d:%02d)\n",
    363 				    19, ctime(&up->ut_time), lp->usr.ut_line,
    364 				    lp->usr.ut_name, secs / 3600,
    365 				    (secs % 3600) / 60, secs % 60);
    366 #endif
    367 			/*
    368 			 * now lose it
    369 			 */
    370 			tlp = lp;
    371 			lp = lp->next;
    372 			if (tlp == head)
    373 				head = lp;
    374 			else if (lp2 != NULL)
    375 				lp2->next = lp;
    376 			free(tlp);
    377 		} else {
    378 			lp2 = lp;
    379 			lp = lp->next;
    380 		}
    381 	return head;
    382 }
    383 
    384 
    385 /*
    386  * if do_tty says ok, login a user
    387  */
    388 struct utmp_list *
    389 log_in(head, up)
    390 	struct utmp_list *head;
    391 	struct utmp *up;
    392 {
    393 	struct utmp_list *lp;
    394 
    395 	/*
    396 	 * this could be a login. if we're not dealing with
    397 	 * the console name, say it is.
    398 	 *
    399 	 * If we are, and if ut_host==":0.0" we know that it
    400 	 * isn't a real login. _But_ if we have not yet recorded
    401 	 * someone being logged in on Console - due to the wtmp
    402 	 * file starting after they logged in, we'll pretend they
    403 	 * logged in, at the start of the wtmp file.
    404 	 */
    405 
    406 #ifdef CONSOLE_TTY
    407 	if (up->ut_host[0] == ':') {
    408 		/*
    409 		 * SunOS 4.0.2 does not treat ":0.0" as special but we
    410 		 * do.
    411 		 */
    412 		if (on_console(head))
    413 			return head;
    414 		/*
    415 		 * ok, no recorded login, so they were here when wtmp
    416 		 * started!  Adjust ut_time!
    417 		 */
    418 		up->ut_time = FirstTime;
    419 		/*
    420 		 * this allows us to pick the right logout
    421 		 */
    422 		(void)strcpy(up->ut_line, Console);
    423 	}
    424 #endif
    425 	/*
    426 	 * If we are doing specified ttys only, we ignore
    427 	 * anything else.
    428 	 */
    429 	if (Flags & AC_T)
    430 		if (!do_tty(up->ut_line))
    431 			return head;
    432 
    433 	/*
    434 	 * go ahead and log them in
    435 	 */
    436 	if ((lp = NEW(struct utmp_list)) == NULL)
    437 		err(1, "malloc");
    438 	lp->next = head;
    439 	head = lp;
    440 	memmove((char *)&lp->usr, (char *)up, sizeof (struct utmp));
    441 #ifdef DEBUG
    442 	if (Debug) {
    443 		printf("%-.*s %s: %s logged in", 19, ctime(&lp->usr.ut_time),
    444 		       up->ut_line, up->ut_name);
    445 		if (*up->ut_host)
    446 			printf(" (%s)", up->ut_host);
    447 		putchar('\n');
    448 	}
    449 #endif
    450 	return head;
    451 }
    452 
    453 int
    454 ac(fp)
    455 	FILE	*fp;
    456 {
    457 	struct utmp_list *lp, *head = NULL;
    458 	struct utmp usr;
    459 	struct tm *ltm;
    460 	time_t secs;
    461 	int day = -1;
    462 
    463 	while (fread((char *)&usr, sizeof(usr), 1, fp) == 1) {
    464 		if (!FirstTime)
    465 			FirstTime = usr.ut_time;
    466 		if (Flags & AC_D) {
    467 			ltm = localtime(&usr.ut_time);
    468 			if (day >= 0 && day != ltm->tm_yday) {
    469 				day = ltm->tm_yday;
    470 				/*
    471 				 * print yesterday's total
    472 				 */
    473 				secs = usr.ut_time;
    474 				secs -= ltm->tm_sec;
    475 				secs -= 60 * ltm->tm_min;
    476 				secs -= 3600 * ltm->tm_hour;
    477 				show_today(Users, head, secs);
    478 			} else
    479 				day = ltm->tm_yday;
    480 		}
    481 		switch(*usr.ut_line) {
    482 		case '|':
    483 			secs = usr.ut_time;
    484 			break;
    485 		case '{':
    486 			secs -= usr.ut_time;
    487 			/*
    488 			 * adjust time for those logged in
    489 			 */
    490 			for (lp = head; lp != NULL; lp = lp->next)
    491 				lp->usr.ut_time -= secs;
    492 			break;
    493 		case '~':			/* reboot or shutdown */
    494 			head = log_out(head, &usr);
    495 			break;
    496 		default:
    497 			/*
    498 			 * if they came in on tty[p-y]*, then it is only
    499 			 * a login session if the ut_host field is non-empty
    500 			 */
    501 			if (*usr.ut_name) {
    502 				if (strncmp(usr.ut_line, "tty", 3) != 0 ||
    503 				    strchr("pqrstuvwxy", usr.ut_line[3]) == 0 ||
    504 				    *usr.ut_host != '\0')
    505 					head = log_in(head, &usr);
    506 			} else
    507 				head = log_out(head, &usr);
    508 			break;
    509 		}
    510 	}
    511 	(void)fclose(fp);
    512 	usr.ut_time = time((time_t *)0);
    513 	(void)strcpy(usr.ut_line, "~");
    514 
    515 	if (Flags & AC_D) {
    516 		ltm = localtime(&usr.ut_time);
    517 		if (day >= 0 && day != ltm->tm_yday) {
    518 			/*
    519 			 * print yesterday's total
    520 			 */
    521 			secs = usr.ut_time;
    522 			secs -= ltm->tm_sec;
    523 			secs -= 60 * ltm->tm_min;
    524 			secs -= 3600 * ltm->tm_hour;
    525 			show_today(Users, head, secs);
    526 		}
    527 	}
    528 	/*
    529 	 * anyone still logged in gets time up to now
    530 	 */
    531 	head = log_out(head, &usr);
    532 
    533 	if (Flags & AC_D)
    534 		show_today(Users, head, time((time_t *)0));
    535 	else {
    536 		if (Flags & AC_P)
    537 			show_users(Users);
    538 		show("total", Total);
    539 	}
    540 	return 0;
    541 }
    542 
    543 void
    544 usage()
    545 {
    546 	(void)fprintf(stderr,
    547 #ifdef CONSOLE_TTY
    548 	    "ac [-dp] [-c console] [-t tty] [-w wtmp] [users ...]\n");
    549 #else
    550 	    "ac [-dp] [-t tty] [-w wtmp] [users ...]\n");
    551 #endif
    552 	exit(1);
    553 }
    554