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last.c revision 1.1.1.2 
      1 /*
      2  * Copyright (c) 1987, 1993, 1994
      3  *	The Regents of the University of California.  All rights reserved.
      4  *
      5  * Redistribution and use in source and binary forms, with or without
      6  * modification, are permitted provided that the following conditions
      7  * are met:
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer in the
     12  *    documentation and/or other materials provided with the distribution.
     13  * 3. All advertising materials mentioning features or use of this software
     14  *    must display the following acknowledgement:
     15  *	This product includes software developed by the University of
     16  *	California, Berkeley and its contributors.
     17  * 4. Neither the name of the University nor the names of its contributors
     18  *    may be used to endorse or promote products derived from this software
     19  *    without specific prior written permission.
     20  *
     21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     31  * SUCH DAMAGE.
     32  */
     33 
     34 #ifndef lint
     35 static char copyright[] =
     36 "@(#) Copyright (c) 1987, 1993, 1994\n\
     37 	The Regents of the University of California.  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 static char sccsid[] = "@(#)last.c	8.2 (Berkeley) 4/2/94";
     42 #endif /* not lint */
     43 
     44 #include <sys/param.h>
     45 #include <sys/stat.h>
     46 
     47 #include <err.h>
     48 #include <fcntl.h>
     49 #include <paths.h>
     50 #include <signal.h>
     51 #include <stdio.h>
     52 #include <stdlib.h>
     53 #include <string.h>
     54 #include <time.h>
     55 #include <tzfile.h>
     56 #include <unistd.h>
     57 #include <utmp.h>
     58 
     59 #define	NO	0				/* false/no */
     60 #define	YES	1				/* true/yes */
     61 
     62 static struct utmp	buf[1024];		/* utmp read buffer */
     63 
     64 typedef struct arg {
     65 	char	*name;				/* argument */
     66 #define	HOST_TYPE	-2
     67 #define	TTY_TYPE	-3
     68 #define	USER_TYPE	-4
     69 	int	type;				/* type of arg */
     70 	struct arg	*next;			/* linked list pointer */
     71 } ARG;
     72 ARG	*arglist;				/* head of linked list */
     73 
     74 typedef struct ttytab {
     75 	long	logout;				/* log out time */
     76 	char	tty[UT_LINESIZE + 1];		/* terminal name */
     77 	struct ttytab	*next;			/* linked list pointer */
     78 } TTY;
     79 TTY	*ttylist;				/* head of linked list */
     80 
     81 static long	currentout,			/* current logout value */
     82 		maxrec;				/* records to display */
     83 static char	*file = _PATH_WTMP;		/* wtmp file */
     84 
     85 void	 addarg __P((int, char *));
     86 TTY	*addtty __P((char *));
     87 void	 hostconv __P((char *));
     88 void	 onintr __P((int));
     89 char	*ttyconv __P((char *));
     90 int	 want __P((struct utmp *, int));
     91 void	 wtmp __P((void));
     92 
     93 int
     94 main(argc, argv)
     95 	int argc;
     96 	char *argv[];
     97 {
     98 	extern int optind;
     99 	extern char *optarg;
    100 	int ch;
    101 	char *p;
    102 
    103 	maxrec = -1;
    104 	while ((ch = getopt(argc, argv, "0123456789f:h:t:")) != EOF)
    105 		switch (ch) {
    106 		case '0': case '1': case '2': case '3': case '4':
    107 		case '5': case '6': case '7': case '8': case '9':
    108 			/*
    109 			 * kludge: last was originally designed to take
    110 			 * a number after a dash.
    111 			 */
    112 			if (maxrec == -1) {
    113 				p = argv[optind - 1];
    114 				if (p[0] == '-' && p[1] == ch && !p[2])
    115 					maxrec = atol(++p);
    116 				else
    117 					maxrec = atol(argv[optind] + 1);
    118 				if (!maxrec)
    119 					exit(0);
    120 			}
    121 			break;
    122 		case 'f':
    123 			file = optarg;
    124 			break;
    125 		case 'h':
    126 			hostconv(optarg);
    127 			addarg(HOST_TYPE, optarg);
    128 			break;
    129 		case 't':
    130 			addarg(TTY_TYPE, ttyconv(optarg));
    131 			break;
    132 		case '?':
    133 		default:
    134 			(void)fprintf(stderr,
    135 	"usage: last [-#] [-f file] [-t tty] [-h hostname] [user ...]\n");
    136 			exit(1);
    137 		}
    138 
    139 	if (argc) {
    140 		setlinebuf(stdout);
    141 		for (argv += optind; *argv; ++argv) {
    142 #define	COMPATIBILITY
    143 #ifdef	COMPATIBILITY
    144 			/* code to allow "last p5" to work */
    145 			addarg(TTY_TYPE, ttyconv(*argv));
    146 #endif
    147 			addarg(USER_TYPE, *argv);
    148 		}
    149 	}
    150 	wtmp();
    151 	exit(0);
    152 }
    153 
    154 /*
    155  * wtmp --
    156  *	read through the wtmp file
    157  */
    158 void
    159 wtmp()
    160 {
    161 	struct utmp	*bp;			/* current structure */
    162 	TTY	*T;				/* tty list entry */
    163 	struct stat	stb;			/* stat of file for size */
    164 	long	bl, delta;			/* time difference */
    165 	int	bytes, wfd;
    166 	char	*ct, *crmsg;
    167 
    168 	if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1)
    169 		err(1, "%s", file);
    170 	bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);
    171 
    172 	(void)time(&buf[0].ut_time);
    173 	(void)signal(SIGINT, onintr);
    174 	(void)signal(SIGQUIT, onintr);
    175 
    176 	while (--bl >= 0) {
    177 		if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 ||
    178 		    (bytes = read(wfd, buf, sizeof(buf))) == -1)
    179 			err(1, "%s", file);
    180 		for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp) {
    181 			/*
    182 			 * if the terminal line is '~', the machine stopped.
    183 			 * see utmp(5) for more info.
    184 			 */
    185 			if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
    186 				/* everybody just logged out */
    187 				for (T = ttylist; T; T = T->next)
    188 					T->logout = -bp->ut_time;
    189 				currentout = -bp->ut_time;
    190 				crmsg = strncmp(bp->ut_name, "shutdown",
    191 				    UT_NAMESIZE) ? "crash" : "shutdown";
    192 				if (want(bp, NO)) {
    193 					ct = ctime(&bp->ut_time);
    194 				printf("%-*.*s  %-*.*s %-*.*s %10.10s %5.5s \n",
    195 					    UT_NAMESIZE, UT_NAMESIZE,
    196 					    bp->ut_name, UT_LINESIZE,
    197 					    UT_LINESIZE, bp->ut_line,
    198 					    UT_HOSTSIZE, UT_HOSTSIZE,
    199 					    bp->ut_host, ct, ct + 11);
    200 					if (maxrec != -1 && !--maxrec)
    201 						return;
    202 				}
    203 				continue;
    204 			}
    205 			/*
    206 			 * if the line is '{' or '|', date got set; see
    207 			 * utmp(5) for more info.
    208 			 */
    209 			if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|')
    210 			    && !bp->ut_line[1]) {
    211 				if (want(bp, NO)) {
    212 					ct = ctime(&bp->ut_time);
    213 				printf("%-*.*s  %-*.*s %-*.*s %10.10s %5.5s \n",
    214 				    UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
    215 				    UT_LINESIZE, UT_LINESIZE, bp->ut_line,
    216 				    UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
    217 				    ct, ct + 11);
    218 					if (maxrec && !--maxrec)
    219 						return;
    220 				}
    221 				continue;
    222 			}
    223 			/* find associated tty */
    224 			for (T = ttylist;; T = T->next) {
    225 				if (!T) {
    226 					/* add new one */
    227 					T = addtty(bp->ut_line);
    228 					break;
    229 				}
    230 				if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE))
    231 					break;
    232 			}
    233 			if (bp->ut_name[0] && want(bp, YES)) {
    234 				ct = ctime(&bp->ut_time);
    235 				printf("%-*.*s  %-*.*s %-*.*s %10.10s %5.5s ",
    236 				UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
    237 				UT_LINESIZE, UT_LINESIZE, bp->ut_line,
    238 				UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
    239 				ct, ct + 11);
    240 				if (!T->logout)
    241 					puts("  still logged in");
    242 				else {
    243 					if (T->logout < 0) {
    244 						T->logout = -T->logout;
    245 						printf("- %s", crmsg);
    246 					}
    247 					else
    248 						printf("- %5.5s",
    249 						    ctime(&T->logout)+11);
    250 					delta = T->logout - bp->ut_time;
    251 					if (delta < SECSPERDAY)
    252 						printf("  (%5.5s)\n",
    253 						    asctime(gmtime(&delta))+11);
    254 					else
    255 						printf(" (%ld+%5.5s)\n",
    256 						    delta / SECSPERDAY,
    257 						    asctime(gmtime(&delta))+11);
    258 				}
    259 				if (maxrec != -1 && !--maxrec)
    260 					return;
    261 			}
    262 			T->logout = bp->ut_time;
    263 		}
    264 	}
    265 	ct = ctime(&buf[0].ut_time);
    266 	printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11);
    267 }
    268 
    269 /*
    270  * want --
    271  *	see if want this entry
    272  */
    273 int
    274 want(bp, check)
    275 	struct utmp *bp;
    276 	int check;
    277 {
    278 	ARG *step;
    279 
    280 	if (check)
    281 		/*
    282 		 * when uucp and ftp log in over a network, the entry in
    283 		 * the utmp file is the name plus their process id.  See
    284 		 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information.
    285 		 */
    286 		if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1))
    287 			bp->ut_line[3] = '\0';
    288 		else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1))
    289 			bp->ut_line[4] = '\0';
    290 	if (!arglist)
    291 		return (YES);
    292 
    293 	for (step = arglist; step; step = step->next)
    294 		switch(step->type) {
    295 		case HOST_TYPE:
    296 			if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE))
    297 				return (YES);
    298 			break;
    299 		case TTY_TYPE:
    300 			if (!strncmp(step->name, bp->ut_line, UT_LINESIZE))
    301 				return (YES);
    302 			break;
    303 		case USER_TYPE:
    304 			if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE))
    305 				return (YES);
    306 			break;
    307 	}
    308 	return (NO);
    309 }
    310 
    311 /*
    312  * addarg --
    313  *	add an entry to a linked list of arguments
    314  */
    315 void
    316 addarg(type, arg)
    317 	int type;
    318 	char *arg;
    319 {
    320 	ARG *cur;
    321 
    322 	if (!(cur = (ARG *)malloc((u_int)sizeof(ARG))))
    323 		err(1, "malloc failure");
    324 	cur->next = arglist;
    325 	cur->type = type;
    326 	cur->name = arg;
    327 	arglist = cur;
    328 }
    329 
    330 /*
    331  * addtty --
    332  *	add an entry to a linked list of ttys
    333  */
    334 TTY *
    335 addtty(ttyname)
    336 	char *ttyname;
    337 {
    338 	TTY *cur;
    339 
    340 	if (!(cur = (TTY *)malloc((u_int)sizeof(TTY))))
    341 		err(1, "malloc failure");
    342 	cur->next = ttylist;
    343 	cur->logout = currentout;
    344 	memmove(cur->tty, ttyname, UT_LINESIZE);
    345 	return (ttylist = cur);
    346 }
    347 
    348 /*
    349  * hostconv --
    350  *	convert the hostname to search pattern; if the supplied host name
    351  *	has a domain attached that is the same as the current domain, rip
    352  *	off the domain suffix since that's what login(1) does.
    353  */
    354 void
    355 hostconv(arg)
    356 	char *arg;
    357 {
    358 	static int first = 1;
    359 	static char *hostdot, name[MAXHOSTNAMELEN];
    360 	char *argdot;
    361 
    362 	if (!(argdot = strchr(arg, '.')))
    363 		return;
    364 	if (first) {
    365 		first = 0;
    366 		if (gethostname(name, sizeof(name)))
    367 			err(1, "gethostname");
    368 		hostdot = strchr(name, '.');
    369 	}
    370 	if (hostdot && !strcasecmp(hostdot, argdot))
    371 		*argdot = '\0';
    372 }
    373 
    374 /*
    375  * ttyconv --
    376  *	convert tty to correct name.
    377  */
    378 char *
    379 ttyconv(arg)
    380 	char *arg;
    381 {
    382 	char *mval;
    383 
    384 	/*
    385 	 * kludge -- we assume that all tty's end with
    386 	 * a two character suffix.
    387 	 */
    388 	if (strlen(arg) == 2) {
    389 		/* either 6 for "ttyxx" or 8 for "console" */
    390 		if (!(mval = malloc((u_int)8)))
    391 			err(1, "malloc failure");
    392 		if (!strcmp(arg, "co"))
    393 			(void)strcpy(mval, "console");
    394 		else {
    395 			(void)strcpy(mval, "tty");
    396 			(void)strcpy(mval + 3, arg);
    397 		}
    398 		return (mval);
    399 	}
    400 	if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
    401 		return (arg + 5);
    402 	return (arg);
    403 }
    404 
    405 /*
    406  * onintr --
    407  *	on interrupt, we inform the user how far we've gotten
    408  */
    409 void
    410 onintr(signo)
    411 	int signo;
    412 {
    413 	char *ct;
    414 
    415 	ct = ctime(&buf[0].ut_time);
    416 	printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11);
    417 	if (signo == SIGINT)
    418 		exit(1);
    419 	(void)fflush(stdout);			/* fix required for rsh */
    420 }
    421