/*
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1987, 1993, 1994
* The Regents of the University of California. All rights reserved.
* Copyright (c) 2018 Philip Paeps
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1987, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static const char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94";
#endif /* not lint */
#include <sys/cdefs.h>
#include <sys/param.h>
#include <sys/capsicum.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <capsicum_helpers.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <langinfo.h>
#include <locale.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <timeconv.h>
#include <unistd.h>
#include <utmpx.h>
#include <libxo/xo.h>
#define NO 0 /* false/no */
#define YES 1 /* true/yes */
#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
typedef struct arg {
char *name; /* argument */
#define REBOOT_TYPE -1
#define HOST_TYPE -2
#define TTY_TYPE -3
#define USER_TYPE -4
int type; /* type of arg */
struct arg *next; /* linked list pointer */
} ARG;
static ARG *arglist; /* head of linked list */
static SLIST_HEAD(, idtab) idlist;
struct idtab {
time_t logout; /* log out time */
char id[sizeof ((struct utmpx *)0)->ut_id]; /* identifier */
SLIST_ENTRY(idtab) list;
};
static const char *crmsg; /* cause of last reboot */
static time_t currentout; /* current logout value */
static long maxrec; /* records to display */
static const char *file = NULL; /* utx.log file */
static int sflag = 0; /* show delta in seconds */
static int width = 5; /* show seconds in delta */
static int yflag; /* show year */
static int d_first;
static int snapfound = 0; /* found snapshot entry? */
static time_t snaptime; /* if != 0, we will only
* report users logged in
* at this snapshot time
*/
static void addarg(int, char *);
static time_t dateconv(char *);
static void doentry(struct utmpx *);
static void hostconv(char *);
static void printentry(struct utmpx *, struct idtab *);
static char *ttyconv(char *);
static int want(struct utmpx *);
static void usage(void);
static void wtmp(void);
static void
usage(void)
{
xo_error(
"usage: last [-swy] [-d [[CC]YY][MMDD]hhmm[.SS]] [-f file] [-h host]\n"
" [-n maxrec] [-t tty] [user ...]\n");
exit(1);
}
int
main(int argc, char *argv[])
{
int ch;
char *p;
(void) setlocale(LC_TIME, "");
d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
argc = xo_parse_args(argc, argv);
if (argc < 0)
exit(1);
atexit(xo_finish_atexit);
maxrec = -1;
snaptime = 0;
while ((ch = getopt(argc, argv, "0123456789d:f:h:n:st:wy")) != -1)
switch (ch) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
/*
* kludge: last was originally designed to take
* a number after a dash.
*/
if (maxrec == -1) {
p = strchr(argv[optind - 1], ch);
if (p == NULL)
p = strchr(argv[optind], ch);
maxrec = atol(p);
if (!maxrec)
exit(0);
}
break;
case 'd':
snaptime = dateconv(optarg);
break;
case 'f':
file = optarg;
break;
case 'h':
hostconv(optarg);
addarg(HOST_TYPE, optarg);
break;
case 'n':
errno = 0;
maxrec = strtol(optarg, &p, 10);
if (p == optarg || *p != '\0' || errno != 0 ||
maxrec <= 0)
xo_errx(1, "%s: bad line count", optarg);
break;
case 's':
sflag++; /* Show delta as seconds */
break;
case 't':
addarg(TTY_TYPE, ttyconv(optarg));
break;
case 'w':
width = 8;
break;
case 'y':
yflag++;
break;
case '?':
default:
usage();
}
if (caph_limit_stdio() < 0)
xo_err(1, "can't limit stdio rights");
caph_cache_catpages();
caph_cache_tzdata();
/* Cache UTX database. */
if (setutxdb(UTXDB_LOG, file) != 0)
xo_err(1, "%s", file != NULL ? file : "(default utx db)");
if (caph_enter() < 0)
xo_err(1, "cap_enter");
if (sflag && width == 8) usage();
if (argc) {
setlinebuf(stdout);
for (argv += optind; *argv; ++argv) {
if (strcmp(*argv, "reboot") == 0)
addarg(REBOOT_TYPE, *argv);
#define COMPATIBILITY
#ifdef COMPATIBILITY
/* code to allow "last p5" to work */
addarg(TTY_TYPE, ttyconv(*argv));
#endif
addarg(USER_TYPE, *argv);
}
}
wtmp();
exit(0);
}
/*
* wtmp --
* read through the utx.log file
*/
static void
wtmp(void)
{
struct utmpx *buf = NULL;
struct utmpx *ut;
static unsigned int amount = 0;
time_t t;
char ct[80];
struct tm *tm;
SLIST_INIT(&idlist);
(void)time(&t);
xo_open_container("last-information");
/* Load the last entries from the file. */
while ((ut = getutxent()) != NULL) {
if (amount % 128 == 0) {
buf = realloc(buf, (amount + 128) * sizeof *ut);
if (buf == NULL)
xo_err(1, "realloc");
}
memcpy(&buf[amount++], ut, sizeof *ut);
if (t > ut->ut_tv.tv_sec)
t = ut->ut_tv.tv_sec;
}
endutxent();
/* Display them in reverse order. */
xo_open_list("last");
while (amount > 0)
doentry(&buf[--amount]);
xo_close_list("last");
free(buf);
tm = localtime(&t);
(void) strftime(ct, sizeof(ct), "%+", tm);
xo_emit("\n{:utxdb/%s}", (file == NULL) ? "utx.log" : file);
xo_attr("seconds", "%lu", (unsigned long) t);
xo_emit(" begins {:begins/%hs}\n", ct);
xo_close_container("last-information");
}
/*
* doentry --
* process a single utx.log entry
*/
static void
doentry(struct utmpx *bp)
{
struct idtab *tt;
/* the machine stopped */
if (bp->ut_type == BOOT_TIME || bp->ut_type == SHUTDOWN_TIME) {
/* everybody just logged out */
while ((tt = SLIST_FIRST(&idlist)) != NULL) {
SLIST_REMOVE_HEAD(&idlist, list);
free(tt);
}
currentout = -bp->ut_tv.tv_sec;
crmsg = bp->ut_type != SHUTDOWN_TIME ?
"crash" : "shutdown";
/*
* if we're in snapshot mode, we want to exit if this
* shutdown/reboot appears while we are tracking the
* active range
*/
if (snaptime && snapfound)
exit(0);
/*
* don't print shutdown/reboot entries unless flagged for
*/
if (!snaptime && want(bp))
printentry(bp, NULL);
return;
}
/* date got set */
if (bp->ut_type == OLD_TIME || bp->ut_type == NEW_TIME) {
if (want(bp) && !snaptime)
printentry(bp, NULL);
return;
}
if (bp->ut_type != USER_PROCESS && bp->ut_type != DEAD_PROCESS)
return;
/* find associated identifier */
SLIST_FOREACH(tt, &idlist, list)
if (!memcmp(tt->id, bp->ut_id, sizeof bp->ut_id))
break;
if (tt == NULL) {
/* add new one */
tt = malloc(sizeof(struct idtab));
if (tt == NULL)
xo_errx(1, "malloc failure");
tt->logout = currentout;
memcpy(tt->id, bp->ut_id, sizeof bp->ut_id);
SLIST_INSERT_HEAD(&idlist, tt, list);
}
/*
* print record if not in snapshot mode and wanted
* or in snapshot mode and in snapshot range
*/
if (bp->ut_type == USER_PROCESS && (want(bp) ||
(bp->ut_tv.tv_sec < snaptime &&
(tt->logout > snaptime || tt->logout < 1)))) {
snapfound = 1;
printentry(bp, tt);
}
tt->logout = bp->ut_tv.tv_sec;
}
/*
* printentry --
* output an entry
*
* If `tt' is non-NULL, use it and `crmsg' to print the logout time or
* logout type (crash/shutdown) as appropriate.
*/
static void
printentry(struct utmpx *bp, struct idtab *tt)
{
char ct[80];
struct tm *tm;
time_t delta; /* time difference */
time_t t;
if (maxrec != -1 && !maxrec--)
exit(0);
xo_open_instance("last");
t = bp->ut_tv.tv_sec;
tm = localtime(&t);
(void) strftime(ct, sizeof(ct), d_first ?
(yflag ? "%a %e %b %Y %R" : "%a %e %b %R") :
(yflag ? "%a %b %e %Y %R" : "%a %b %e %R"), tm);
switch (bp->ut_type) {
case BOOT_TIME:
xo_emit("{:user/%-42s/%s}", "boot time");
break;
case SHUTDOWN_TIME:
xo_emit("{:user/%-42s/%s}", "shutdown time");
break;
case OLD_TIME:
xo_emit("{:user/%-42s/%s}", "old time");
break;
case NEW_TIME:
xo_emit("{:user/%-42s/%s}", "new time");
break;
case USER_PROCESS:
xo_emit("{:user/%-10s/%s} {:tty/%-8s/%s} {:from/%-22.22s/%s}",
bp->ut_user, bp->ut_line, bp->ut_host);
break;
}
xo_attr("seconds", "%lu", (unsigned long)t);
xo_emit(" {:login-time/%hs%c/%s}", ct, tt == NULL ? '\n' : ' ');
if (tt == NULL)
goto end;
if (!tt->logout) {
xo_emit(" {:logout-time/still logged in}\n");
goto end;
}
if (tt->logout < 0) {
tt->logout = -tt->logout;
xo_emit("- {:logout-reason/%s}", crmsg);
} else {
tm = localtime(&tt->logout);
(void) strftime(ct, sizeof(ct), "%R", tm);
xo_attr("seconds", "%lu", (unsigned long)tt->logout);
xo_emit("- {:logout-time/%s}", ct);
}
delta = tt->logout - bp->ut_tv.tv_sec;
xo_attr("seconds", "%ld", (long)delta);
if (sflag) {
xo_emit(" ({:session-length/%8ld})\n", (long)delta);
} else {
tm = gmtime(&delta);
(void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm);
if (delta < 86400)
xo_emit(" ({:session-length/%s})\n", ct);
else
xo_emit(" ({:session-length/%ld+%s})\n",
(long)delta / 86400, ct);
}
end:
xo_close_instance("last");
}
/*
* want --
* see if want this entry
*/
static int
want(struct utmpx *bp)
{
ARG *step;
if (snaptime)
return (NO);
if (!arglist)
return (YES);
for (step = arglist; step; step = step->next)
switch(step->type) {
case REBOOT_TYPE:
if (bp->ut_type == BOOT_TIME ||
bp->ut_type == SHUTDOWN_TIME)
return (YES);
break;
case HOST_TYPE:
if (!strcasecmp(step->name, bp->ut_host))
return (YES);
break;
case TTY_TYPE:
if (!strcmp(step->name, bp->ut_line))
return (YES);
break;
case USER_TYPE:
if (!strcmp(step->name, bp->ut_user))
return (YES);
break;
}
return (NO);
}
/*
* addarg --
* add an entry to a linked list of arguments
*/
static void
addarg(int type, char *arg)
{
ARG *cur;
if ((cur = malloc(sizeof(ARG))) == NULL)
xo_errx(1, "malloc failure");
cur->next = arglist;
cur->type = type;
cur->name = arg;
arglist = cur;
}
/*
* hostconv --
* convert the hostname to search pattern; if the supplied host name
* has a domain attached that is the same as the current domain, rip
* off the domain suffix since that's what login(1) does.
*/
static void
hostconv(char *arg)
{
static int first = 1;
static char *hostdot, name[MAXHOSTNAMELEN];
char *argdot;
if (!(argdot = strchr(arg, '.')))
return;
if (first) {
first = 0;
if (gethostname(name, sizeof(name)))
xo_err(1, "gethostname");
hostdot = strchr(name, '.');
}
if (hostdot && !strcasecmp(hostdot, argdot))
*argdot = '\0';
}
/*
* ttyconv --
* convert tty to correct name.
*/
static char *
ttyconv(char *arg)
{
char *mval;
/*
* kludge -- we assume that all tty's end with
* a two character suffix.
*/
if (strlen(arg) == 2) {
/* either 6 for "ttyxx" or 8 for "console" */
if ((mval = malloc(8)) == NULL)
xo_errx(1, "malloc failure");
if (!strcmp(arg, "co"))
(void)strcpy(mval, "console");
else {
(void)strcpy(mval, "tty");
(void)strcpy(mval + 3, arg);
}
return (mval);
}
if (!strncmp(arg, _PATH_DEV, sizeof(_PATH_DEV) - 1))
return (arg + 5);
return (arg);
}
/*
* dateconv --
* Convert the snapshot time in command line given in the format
* [[CC]YY]MMDDhhmm[.SS]] to a time_t.
* Derived from atime_arg1() in usr.bin/touch/touch.c
*/
static time_t
dateconv(char *arg)
{
time_t timet;
struct tm *t;
int yearset;
char *p;
/* Start with the current time. */
if (time(&timet) < 0)
xo_err(1, "time");
if ((t = localtime(&timet)) == NULL)
xo_err(1, "localtime");
/* [[CC]YY]MMDDhhmm[.SS] */
if ((p = strchr(arg, '.')) == NULL)
t->tm_sec = 0; /* Seconds defaults to 0. */
else {
if (strlen(p + 1) != 2)
goto terr;
*p++ = '\0';
t->tm_sec = ATOI2(p);
}
yearset = 0;
switch (strlen(arg)) {
case 12: /* CCYYMMDDhhmm */
t->tm_year = ATOI2(arg);
t->tm_year *= 100;
yearset = 1;
/* FALLTHROUGH */
case 10: /* YYMMDDhhmm */
if (yearset) {
yearset = ATOI2(arg);
t->tm_year += yearset;
} else {
yearset = ATOI2(arg);
if (yearset < 69)
t->tm_year = yearset + 2000;
else
t->tm_year = yearset + 1900;
}
t->tm_year -= 1900; /* Convert to UNIX time. */
/* FALLTHROUGH */
case 8: /* MMDDhhmm */
t->tm_mon = ATOI2(arg);
--t->tm_mon; /* Convert from 01-12 to 00-11 */
t->tm_mday = ATOI2(arg);
t->tm_hour = ATOI2(arg);
t->tm_min = ATOI2(arg);
break;
case 4: /* hhmm */
t->tm_hour = ATOI2(arg);
t->tm_min = ATOI2(arg);
break;
default:
goto terr;
}
t->tm_isdst = -1; /* Figure out DST. */
timet = mktime(t);
if (timet == -1)
terr: xo_errx(1,
"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
return timet;
}
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