2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 1987, 1993, 1994
5 * The Regents of the University of California. All rights reserved.
6 * Copyright (c) 2018 Philip Paeps
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 static const char copyright[] =
35 "@(#) Copyright (c) 1987, 1993, 1994\n\
36 The Regents of the University of California. All rights reserved.\n";
40 static const char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94";
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
45 #include <sys/param.h>
46 #include <sys/capsicum.h>
47 #include <sys/queue.h>
50 #include <capsicum_helpers.h>
68 #define NO 0 /* false/no */
69 #define YES 1 /* true/yes */
70 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
73 char *name; /* argument */
74 #define REBOOT_TYPE -1
78 int type; /* type of arg */
79 struct arg *next; /* linked list pointer */
81 static ARG *arglist; /* head of linked list */
83 static SLIST_HEAD(, idtab) idlist;
86 time_t logout; /* log out time */
87 char id[sizeof ((struct utmpx *)0)->ut_id]; /* identifier */
88 SLIST_ENTRY(idtab) list;
91 static const char *crmsg; /* cause of last reboot */
92 static time_t currentout; /* current logout value */
93 static long maxrec; /* records to display */
94 static const char *file = NULL; /* utx.log file */
95 static int sflag = 0; /* show delta in seconds */
96 static int utf8flag; /* current locale is UTF-8 */
97 static int width = 5; /* show seconds in delta */
98 static int yflag; /* show year */
100 static int snapfound = 0; /* found snapshot entry? */
101 static time_t snaptime; /* if != 0, we will only
102 * report users logged in
103 * at this snapshot time
106 static void addarg(int, char *);
107 static const char *ctf(const char *);
108 static time_t dateconv(char *);
109 static void doentry(struct utmpx *);
110 static void hostconv(char *);
111 static void printentry(struct utmpx *, struct idtab *);
112 static char *ttyconv(char *);
113 static int want(struct utmpx *);
114 static void usage(void);
115 static void wtmp(void);
118 ctf(const char *fmt) {
120 const char *src, *end;
126 end = buf + sizeof(buf);
127 for (src = fmt, dst = buf; dst < end; *dst++ = *src++) {
131 } else if (*src == '%' && *(src+1) == 's') {
135 strlcpy(dst, src+2, end - dst);
146 "usage: last [-swy] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host]\n"
147 " [-n maxrec] [-t tty] [user ...]\n");
152 main(int argc, char *argv[])
157 (void) setlocale(LC_TIME, "");
158 d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
160 (void) setlocale(LC_CTYPE, "");
161 utf8flag = (strcmp(nl_langinfo(CODESET), "UTF-8") == 0);
163 argc = xo_parse_args(argc, argv);
166 atexit(xo_finish_atexit);
170 while ((ch = getopt(argc, argv, "0123456789d:f:h:n:st:wy")) != -1)
172 case '0': case '1': case '2': case '3': case '4':
173 case '5': case '6': case '7': case '8': case '9':
175 * kludge: last was originally designed to take
176 * a number after a dash.
179 p = strchr(argv[optind - 1], ch);
181 p = strchr(argv[optind], ch);
188 snaptime = dateconv(optarg);
195 addarg(HOST_TYPE, optarg);
199 maxrec = strtol(optarg, &p, 10);
200 if (p == optarg || *p != '\0' || errno != 0 ||
202 xo_errx(1, "%s: bad line count", optarg);
205 sflag++; /* Show delta as seconds */
208 addarg(TTY_TYPE, ttyconv(optarg));
221 if (caph_limit_stdio() < 0)
222 xo_err(1, "can't limit stdio rights");
224 caph_cache_catpages();
227 /* Cache UTX database. */
228 if (setutxdb(UTXDB_LOG, file) != 0)
229 xo_err(1, "%s", file != NULL ? file : "(default utx db)");
231 if (caph_enter() < 0)
232 xo_err(1, "cap_enter");
234 if (sflag && width == 8) usage();
238 for (argv += optind; *argv; ++argv) {
239 if (strcmp(*argv, "reboot") == 0)
240 addarg(REBOOT_TYPE, *argv);
241 #define COMPATIBILITY
243 /* code to allow "last p5" to work */
244 addarg(TTY_TYPE, ttyconv(*argv));
246 addarg(USER_TYPE, *argv);
255 * read through the utx.log file
260 struct utmpx *buf = NULL;
262 static unsigned int amount = 0;
270 xo_open_container("last-information");
272 /* Load the last entries from the file. */
273 while ((ut = getutxent()) != NULL) {
274 if (amount % 128 == 0) {
275 buf = realloc(buf, (amount + 128) * sizeof *ut);
277 xo_err(1, "realloc");
279 memcpy(&buf[amount++], ut, sizeof *ut);
280 if (t > ut->ut_tv.tv_sec)
281 t = ut->ut_tv.tv_sec;
285 /* Display them in reverse order. */
286 xo_open_list("last");
288 doentry(&buf[--amount]);
289 xo_close_list("last");
292 (void) strftime(ct, sizeof(ct), "%+", tm);
293 xo_emit("\n{:utxdb/%s}", (file == NULL) ? "utx.log" : file);
294 xo_attr("seconds", "%lu", (unsigned long) t);
295 xo_emit(ctf(" begins {:begins/%s}\n"), ct);
296 xo_close_container("last-information");
301 * process a single utx.log entry
304 doentry(struct utmpx *bp)
308 /* the machine stopped */
309 if (bp->ut_type == BOOT_TIME || bp->ut_type == SHUTDOWN_TIME) {
310 /* everybody just logged out */
311 while ((tt = SLIST_FIRST(&idlist)) != NULL) {
312 SLIST_REMOVE_HEAD(&idlist, list);
315 currentout = -bp->ut_tv.tv_sec;
316 crmsg = bp->ut_type != SHUTDOWN_TIME ?
317 "crash" : "shutdown";
319 * if we're in snapshot mode, we want to exit if this
320 * shutdown/reboot appears while we we are tracking the
323 if (snaptime && snapfound)
326 * don't print shutdown/reboot entries unless flagged for
328 if (!snaptime && want(bp))
329 printentry(bp, NULL);
333 if (bp->ut_type == OLD_TIME || bp->ut_type == NEW_TIME) {
334 if (want(bp) && !snaptime)
335 printentry(bp, NULL);
339 if (bp->ut_type != USER_PROCESS && bp->ut_type != DEAD_PROCESS)
342 /* find associated identifier */
343 SLIST_FOREACH(tt, &idlist, list)
344 if (!memcmp(tt->id, bp->ut_id, sizeof bp->ut_id))
349 tt = malloc(sizeof(struct idtab));
351 xo_errx(1, "malloc failure");
352 tt->logout = currentout;
353 memcpy(tt->id, bp->ut_id, sizeof bp->ut_id);
354 SLIST_INSERT_HEAD(&idlist, tt, list);
358 * print record if not in snapshot mode and wanted
359 * or in snapshot mode and in snapshot range
361 if (bp->ut_type == USER_PROCESS && (want(bp) ||
362 (bp->ut_tv.tv_sec < snaptime &&
363 (tt->logout > snaptime || tt->logout < 1)))) {
367 tt->logout = bp->ut_tv.tv_sec;
374 * If `tt' is non-NULL, use it and `crmsg' to print the logout time or
375 * logout type (crash/shutdown) as appropriate.
378 printentry(struct utmpx *bp, struct idtab *tt)
382 time_t delta; /* time difference */
385 if (maxrec != -1 && !maxrec--)
387 xo_open_instance("last");
388 t = bp->ut_tv.tv_sec;
390 (void) strftime(ct, sizeof(ct), d_first ?
391 (yflag ? "%a %e %b %Y %R" : "%a %e %b %R") :
392 (yflag ? "%a %b %e %Y %R" : "%a %b %e %R"), tm);
393 switch (bp->ut_type) {
395 xo_emit("{:user/%-42s/%s}", "boot time");
398 xo_emit("{:user/%-42s/%s}", "shutdown time");
401 xo_emit("{:user/%-42s/%s}", "old time");
404 xo_emit("{:user/%-42s/%s}", "new time");
407 xo_emit("{:user/%-10s/%s} {:tty/%-8s/%s} {:from/%-22.22s/%s}",
408 bp->ut_user, bp->ut_line, bp->ut_host);
411 xo_attr("seconds", "%lu", (unsigned long)t);
412 xo_emit(ctf(" {:login-time/%s%c/%s}"), ct, tt == NULL ? '\n' : ' ');
416 xo_emit(" {:logout-time/still logged in}\n");
419 if (tt->logout < 0) {
420 tt->logout = -tt->logout;
421 xo_emit("- {:logout-reason/%s}", crmsg);
423 tm = localtime(&tt->logout);
424 (void) strftime(ct, sizeof(ct), "%R", tm);
425 xo_attr("seconds", "%lu", (unsigned long)tt->logout);
426 xo_emit(ctf("- {:logout-time/%s}"), ct);
428 delta = tt->logout - bp->ut_tv.tv_sec;
429 xo_attr("seconds", "%ld", (long)delta);
431 xo_emit(" ({:session-length/%8ld})\n", (long)delta);
434 (void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm);
436 xo_emit(ctf(" ({:session-length/%s})\n"), ct);
438 xo_emit(ctf(" ({:session-length/%ld+%s})\n"),
439 (long)delta / 86400, ct);
443 xo_close_instance("last");
448 * see if want this entry
451 want(struct utmpx *bp)
461 for (step = arglist; step; step = step->next)
464 if (bp->ut_type == BOOT_TIME ||
465 bp->ut_type == SHUTDOWN_TIME)
469 if (!strcasecmp(step->name, bp->ut_host))
473 if (!strcmp(step->name, bp->ut_line))
477 if (!strcmp(step->name, bp->ut_user))
486 * add an entry to a linked list of arguments
489 addarg(int type, char *arg)
493 if ((cur = malloc(sizeof(ARG))) == NULL)
494 xo_errx(1, "malloc failure");
503 * convert the hostname to search pattern; if the supplied host name
504 * has a domain attached that is the same as the current domain, rip
505 * off the domain suffix since that's what login(1) does.
510 static int first = 1;
511 static char *hostdot, name[MAXHOSTNAMELEN];
514 if (!(argdot = strchr(arg, '.')))
518 if (gethostname(name, sizeof(name)))
519 xo_err(1, "gethostname");
520 hostdot = strchr(name, '.');
522 if (hostdot && !strcasecmp(hostdot, argdot))
528 * convert tty to correct name.
536 * kludge -- we assume that all tty's end with
537 * a two character suffix.
539 if (strlen(arg) == 2) {
540 /* either 6 for "ttyxx" or 8 for "console" */
541 if ((mval = malloc(8)) == NULL)
542 xo_errx(1, "malloc failure");
543 if (!strcmp(arg, "co"))
544 (void)strcpy(mval, "console");
546 (void)strcpy(mval, "tty");
547 (void)strcpy(mval + 3, arg);
551 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
558 * Convert the snapshot time in command line given in the format
559 * [[CC]YY]MMDDhhmm[.SS]] to a time_t.
560 * Derived from atime_arg1() in usr.bin/touch/touch.c
570 /* Start with the current time. */
571 if (time(&timet) < 0)
573 if ((t = localtime(&timet)) == NULL)
574 xo_err(1, "localtime");
576 /* [[CC]YY]MMDDhhmm[.SS] */
577 if ((p = strchr(arg, '.')) == NULL)
578 t->tm_sec = 0; /* Seconds defaults to 0. */
580 if (strlen(p + 1) != 2)
583 t->tm_sec = ATOI2(p);
587 switch (strlen(arg)) {
588 case 12: /* CCYYMMDDhhmm */
589 t->tm_year = ATOI2(arg);
593 case 10: /* YYMMDDhhmm */
595 yearset = ATOI2(arg);
596 t->tm_year += yearset;
598 yearset = ATOI2(arg);
600 t->tm_year = yearset + 2000;
602 t->tm_year = yearset + 1900;
604 t->tm_year -= 1900; /* Convert to UNIX time. */
606 case 8: /* MMDDhhmm */
607 t->tm_mon = ATOI2(arg);
608 --t->tm_mon; /* Convert from 01-12 to 00-11 */
609 t->tm_mday = ATOI2(arg);
610 t->tm_hour = ATOI2(arg);
611 t->tm_min = ATOI2(arg);
614 t->tm_hour = ATOI2(arg);
615 t->tm_min = ATOI2(arg);
620 t->tm_isdst = -1; /* Figure out DST. */
624 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");