2 * Copyright (c) 1987, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
33 * $FreeBSD: src/usr.bin/last/last.c,v 1.10.6.11 2002/11/02 23:00:26 mux Exp $
34 * $DragonFly: src/usr.bin/last/last.c,v 1.2 2003/06/17 04:29:27 dillon Exp $
36 * @(#) Copyright (c) 1987, 1993, 1994 The Regents of the University of California. All rights reserved.
37 * @(#)last.c 8.2 (Berkeley) 4/2/94
40 #include <sys/param.h>
55 #include <sys/queue.h>
57 #define NO 0 /* false/no */
58 #define YES 1 /* true/yes */
59 #define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
61 static struct utmp buf[1024]; /* utmp read buffer */
64 char *name; /* argument */
68 int type; /* type of arg */
69 struct arg *next; /* linked list pointer */
71 ARG *arglist; /* head of linked list */
73 LIST_HEAD(ttylisthead, ttytab) ttylist;
76 time_t logout; /* log out time */
77 char tty[UT_LINESIZE + 1]; /* terminal name */
78 LIST_ENTRY(ttytab) list;
81 static const char *crmsg; /* cause of last reboot */
82 static long currentout, /* current logout value */
83 maxrec; /* records to display */
84 static const char *file = _PATH_WTMP; /* wtmp file */
85 static int sflag = 0; /* show delta in seconds */
86 static int width = 5; /* show seconds in delta */
87 static int yflag; /* show year */
89 static int snapfound = 0; /* found snapshot entry? */
90 static time_t snaptime; /* if != 0, we will only
91 * report users logged in
92 * at this snapshot time
95 int main __P((int, char *[]));
96 void addarg __P((int, char *));
97 time_t dateconv __P((char *));
98 void doentry __P((struct utmp *));
99 void hostconv __P((char *));
100 void onintr __P((int));
101 void printentry __P((struct utmp *, struct ttytab *));
102 char *ttyconv __P((char *));
103 char *ttyconv __P((char *));
104 int want __P((struct utmp *));
105 void usage __P((void));
106 void wtmp __P((void));
111 (void)fprintf(stderr,
112 "usage: last [-#] [-y] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host]\n"
113 "\t[-t tty] [-s|w] [user ...]\n");
125 (void) setlocale(LC_TIME, "");
126 d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
130 while ((ch = getopt(argc, argv, "0123456789d:f:h:st:wy")) != -1)
132 case '0': case '1': case '2': case '3': case '4':
133 case '5': case '6': case '7': case '8': case '9':
135 * kludge: last was originally designed to take
136 * a number after a dash.
139 p = strchr(argv[optind - 1], ch);
141 p = strchr(argv[optind], ch);
148 snaptime = dateconv(optarg);
155 addarg(HOST_TYPE, optarg);
158 sflag++; /* Show delta as seconds */
161 addarg(TTY_TYPE, ttyconv(optarg));
174 if (sflag && width == 8) usage();
178 for (argv += optind; *argv; ++argv) {
179 #define COMPATIBILITY
181 /* code to allow "last p5" to work */
182 addarg(TTY_TYPE, ttyconv(*argv));
184 addarg(USER_TYPE, *argv);
193 * read through the wtmp file
198 struct utmp *bp; /* current structure */
199 struct stat stb; /* stat of file for size */
207 if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1)
209 bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);
211 (void)time(&buf[0].ut_time);
212 (void)signal(SIGINT, onintr);
213 (void)signal(SIGQUIT, onintr);
216 if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 ||
217 (bytes = read(wfd, buf, sizeof(buf))) == -1)
219 for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp)
222 tm = localtime(&buf[0].ut_time);
223 (void) strftime(ct, sizeof(ct), "\nwtmp begins %+\n", tm);
229 * process a single wtmp entry
235 struct ttytab *tt, *ttx; /* ttylist entry */
238 * if the terminal line is '~', the machine stopped.
239 * see utmp(5) for more info.
241 if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
242 /* everybody just logged out */
243 for (tt = LIST_FIRST(&ttylist); tt;) {
244 LIST_REMOVE(tt, list);
246 tt = LIST_NEXT(tt, list);
249 currentout = -bp->ut_time;
250 crmsg = strncmp(bp->ut_name, "shutdown", UT_NAMESIZE) ?
251 "crash" : "shutdown";
253 * if we're in snapshot mode, we want to exit if this
254 * shutdown/reboot appears while we we are tracking the
257 if (snaptime && snapfound)
260 * don't print shutdown/reboot entries unless flagged for
262 if (!snaptime && want(bp))
263 printentry(bp, NULL);
267 * if the line is '{' or '|', date got set; see
268 * utmp(5) for more info.
270 if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') &&
272 if (want(bp) && !snaptime)
273 printentry(bp, NULL);
276 /* find associated tty */
277 LIST_FOREACH(tt, &ttylist, list)
278 if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE))
283 tt = malloc(sizeof(struct ttytab));
285 err(1, "malloc failure");
286 tt->logout = currentout;
287 strncpy(tt->tty, bp->ut_line, UT_LINESIZE);
288 LIST_INSERT_HEAD(&ttylist, tt, list);
292 * print record if not in snapshot mode and wanted
293 * or in snapshot mode and in snapshot range
295 if (bp->ut_name[0] && (want(bp) || (bp->ut_time < snaptime &&
296 (tt->logout > snaptime || tt->logout < 1)))) {
299 * when uucp and ftp log in over a network, the entry in
300 * the utmp file is the name plus their process id. See
301 * etc/ftpd.c and usr.bin/uucp/uucpd.c for more information.
303 if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1))
304 bp->ut_line[3] = '\0';
305 else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1))
306 bp->ut_line[4] = '\0';
309 tt->logout = bp->ut_time;
316 * If `tt' is non-NULL, use it and `crmsg' to print the logout time or
317 * logout type (crash/shutdown) as appropriate.
326 time_t delta; /* time difference */
328 if (maxrec != -1 && !maxrec--)
330 tm = localtime(&bp->ut_time);
331 (void) strftime(ct, sizeof(ct), d_first ?
332 (yflag ? "%a %e %b %Y %R" : "%a %e %b %R") :
333 (yflag ? "%a %b %e %Y %R" : "%a %b %e %R"), tm);
334 printf("%-*.*s %-*.*s %-*.*s %s%c",
335 UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
336 UT_LINESIZE, UT_LINESIZE, bp->ut_line,
337 UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
338 ct, tt == NULL ? '\n' : ' ');
342 puts(" still logged in");
345 if (tt->logout < 0) {
346 tt->logout = -tt->logout;
347 printf("- %s", crmsg);
349 tm = localtime(&tt->logout);
350 (void) strftime(ct, sizeof(ct), "%R", tm);
353 delta = tt->logout - bp->ut_time;
355 printf(" (%8ld)\n", (long)delta);
358 (void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm);
360 printf(" (%s)\n", ct);
362 printf(" (%ld+%s)\n", (long)delta / 86400, ct);
368 * see if want this entry
382 for (step = arglist; step; step = step->next)
385 if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE))
389 if (!strncmp(step->name, bp->ut_line, UT_LINESIZE))
393 if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE))
402 * add an entry to a linked list of arguments
411 if (!(cur = (ARG *)malloc((u_int)sizeof(ARG))))
412 err(1, "malloc failure");
421 * convert the hostname to search pattern; if the supplied host name
422 * has a domain attached that is the same as the current domain, rip
423 * off the domain suffix since that's what login(1) does.
429 static int first = 1;
430 static char *hostdot, name[MAXHOSTNAMELEN];
433 if (!(argdot = strchr(arg, '.')))
437 if (gethostname(name, sizeof(name)))
438 err(1, "gethostname");
439 hostdot = strchr(name, '.');
441 if (hostdot && !strcasecmp(hostdot, argdot))
447 * convert tty to correct name.
456 * kludge -- we assume that all tty's end with
457 * a two character suffix.
459 if (strlen(arg) == 2) {
460 /* either 6 for "ttyxx" or 8 for "console" */
461 if (!(mval = malloc((u_int)8)))
462 err(1, "malloc failure");
463 if (!strcmp(arg, "co"))
464 (void)strcpy(mval, "console");
466 (void)strcpy(mval, "tty");
467 (void)strcpy(mval + 3, arg);
471 if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
478 * Convert the snapshot time in command line given in the format
479 * [[CC]YY]MMDDhhmm[.SS]] to a time_t.
480 * Derived from atime_arg1() in usr.bin/touch/touch.c
491 /* Start with the current time. */
492 if (time(&timet) < 0)
494 if ((t = localtime(&timet)) == NULL)
497 /* [[CC]YY]MMDDhhmm[.SS] */
498 if ((p = strchr(arg, '.')) == NULL)
499 t->tm_sec = 0; /* Seconds defaults to 0. */
501 if (strlen(p + 1) != 2)
504 t->tm_sec = ATOI2(p);
508 switch (strlen(arg)) {
509 case 12: /* CCYYMMDDhhmm */
510 t->tm_year = ATOI2(arg);
514 case 10: /* YYMMDDhhmm */
516 yearset = ATOI2(arg);
517 t->tm_year += yearset;
519 yearset = ATOI2(arg);
521 t->tm_year = yearset + 2000;
523 t->tm_year = yearset + 1900;
525 t->tm_year -= 1900; /* Convert to UNIX time. */
527 case 8: /* MMDDhhmm */
528 t->tm_mon = ATOI2(arg);
529 --t->tm_mon; /* Convert from 01-12 to 00-11 */
530 t->tm_mday = ATOI2(arg);
531 t->tm_hour = ATOI2(arg);
532 t->tm_min = ATOI2(arg);
535 t->tm_hour = ATOI2(arg);
536 t->tm_min = ATOI2(arg);
541 t->tm_isdst = -1; /* Figure out DST. */
545 "out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
552 * on interrupt, we inform the user how far we've gotten
561 tm = localtime(&buf[0].ut_time);
562 (void) strftime(ct, sizeof(ct),
563 d_first ? "%a %e %b %R" : "%a %b %e %R",
565 printf("\ninterrupted %s\n", ct);
568 (void)fflush(stdout); /* fix required for rsh */