FreeBSD-5.3/usr.bin/last/last.c
/*
* Copyright (c) 1987, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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>
__FBSDID("$FreeBSD: src/usr.bin/last/last.c,v 1.34 2004/08/08 18:59:19 dwmalone Exp $");
#include <sys/param.h>
#include <sys/stat.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 <utmp.h>
#include <sys/queue.h>
#define NO 0 /* false/no */
#define YES 1 /* true/yes */
#define ATOI2(ar) ((ar)[0] - '0') * 10 + ((ar)[1] - '0'); (ar) += 2;
static struct utmp buf[1024]; /* utmp read buffer */
typedef struct arg {
char *name; /* argument */
#define HOST_TYPE -2
#define TTY_TYPE -3
#define USER_TYPE -4
int type; /* type of arg */
struct arg *next; /* linked list pointer */
} ARG;
ARG *arglist; /* head of linked list */
LIST_HEAD(ttylisthead, ttytab) ttylist;
struct ttytab {
time_t logout; /* log out time */
char tty[UT_LINESIZE + 1]; /* terminal name */
LIST_ENTRY(ttytab) list;
};
static const char *crmsg; /* cause of last reboot */
static long currentout, /* current logout value */
maxrec; /* records to display */
static const char *file = _PATH_WTMP; /* wtmp 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
*/
void addarg(int, char *);
time_t dateconv(char *);
void doentry(struct utmp *);
void hostconv(char *);
void onintr(int);
void printentry(struct utmp *, struct ttytab *);
char *ttyconv(char *);
int want(struct utmp *);
void usage(void);
void wtmp(void);
void
usage(void)
{
(void)fprintf(stderr,
"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');
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)
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 (sflag && width == 8) usage();
if (argc) {
setlinebuf(stdout);
for (argv += optind; *argv; ++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 wtmp file
*/
void
wtmp(void)
{
struct utmp *bp; /* current structure */
struct stat stb; /* stat of file for size */
long bl;
int bytes, wfd;
char ct[80];
struct tm *tm;
time_t t;
LIST_INIT(&ttylist);
if ((wfd = open(file, O_RDONLY, 0)) < 0 || fstat(wfd, &stb) == -1)
err(1, "%s", file);
bl = (stb.st_size + sizeof(buf) - 1) / sizeof(buf);
(void)time(&t);
buf[0].ut_time = _time_to_int(t);
(void)signal(SIGINT, onintr);
(void)signal(SIGQUIT, onintr);
while (--bl >= 0) {
if (lseek(wfd, (off_t)(bl * sizeof(buf)), L_SET) == -1 ||
(bytes = read(wfd, buf, sizeof(buf))) == -1)
err(1, "%s", file);
for (bp = &buf[bytes / sizeof(buf[0]) - 1]; bp >= buf; --bp)
doentry(bp);
}
t = _int_to_time(buf[0].ut_time);
tm = localtime(&t);
(void) strftime(ct, sizeof(ct), "\nwtmp begins %+\n", tm);
printf("%s", ct);
}
/*
* doentry --
* process a single wtmp entry
*/
void
doentry(struct utmp *bp)
{
struct ttytab *tt, *ttx; /* ttylist entry */
/*
* if the terminal line is '~', the machine stopped.
* see utmp(5) for more info.
*/
if (bp->ut_line[0] == '~' && !bp->ut_line[1]) {
/* everybody just logged out */
for (tt = LIST_FIRST(&ttylist); tt;) {
LIST_REMOVE(tt, list);
ttx = tt;
tt = LIST_NEXT(tt, list);
free(ttx);
}
currentout = -bp->ut_time;
crmsg = strncmp(bp->ut_name, "shutdown", UT_NAMESIZE) ?
"crash" : "shutdown";
/*
* if we're in snapshot mode, we want to exit if this
* shutdown/reboot appears while we 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;
}
/*
* if the line is '{' or '|', date got set; see
* utmp(5) for more info.
*/
if ((bp->ut_line[0] == '{' || bp->ut_line[0] == '|') &&
!bp->ut_line[1]) {
if (want(bp) && !snaptime)
printentry(bp, NULL);
return;
}
/* find associated tty */
LIST_FOREACH(tt, &ttylist, list)
if (!strncmp(tt->tty, bp->ut_line, UT_LINESIZE))
break;
if (tt == NULL) {
/* add new one */
tt = malloc(sizeof(struct ttytab));
if (tt == NULL)
errx(1, "malloc failure");
tt->logout = currentout;
strncpy(tt->tty, bp->ut_line, UT_LINESIZE);
LIST_INSERT_HEAD(&ttylist, tt, list);
}
/*
* print record if not in snapshot mode and wanted
* or in snapshot mode and in snapshot range
*/
if (bp->ut_name[0] && (want(bp) || (bp->ut_time < snaptime &&
(tt->logout > snaptime || tt->logout < 1)))) {
snapfound = 1;
/*
* when uucp and ftp log in over a network, the entry in
* the utmp file is the name plus their process id. See
* etc/ftpd.c and usr.bin/uucp/uucpd.c for more information.
*/
if (!strncmp(bp->ut_line, "ftp", sizeof("ftp") - 1))
bp->ut_line[3] = '\0';
else if (!strncmp(bp->ut_line, "uucp", sizeof("uucp") - 1))
bp->ut_line[4] = '\0';
printentry(bp, tt);
}
tt->logout = bp->ut_time;
}
/*
* 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.
*/
void
printentry(struct utmp *bp, struct ttytab *tt)
{
char ct[80];
struct tm *tm;
time_t delta; /* time difference */
time_t t;
if (maxrec != -1 && !maxrec--)
exit(0);
t = _int_to_time(bp->ut_time);
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);
printf("%-*.*s %-*.*s %-*.*s %s%c",
UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
UT_LINESIZE, UT_LINESIZE, bp->ut_line,
UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
ct, tt == NULL ? '\n' : ' ');
if (tt == NULL)
return;
if (!tt->logout) {
puts(" still logged in");
return;
}
if (tt->logout < 0) {
tt->logout = -tt->logout;
printf("- %s", crmsg);
} else {
tm = localtime(&tt->logout);
(void) strftime(ct, sizeof(ct), "%R", tm);
printf("- %s", ct);
}
delta = tt->logout - bp->ut_time;
if (sflag) {
printf(" (%8ld)\n", (long)delta);
} else {
tm = gmtime(&delta);
(void) strftime(ct, sizeof(ct), width >= 8 ? "%T" : "%R", tm);
if (delta < 86400)
printf(" (%s)\n", ct);
else
printf(" (%ld+%s)\n", (long)delta / 86400, ct);
}
}
/*
* want --
* see if want this entry
*/
int
want(struct utmp *bp)
{
ARG *step;
if (snaptime)
return (NO);
if (!arglist)
return (YES);
for (step = arglist; step; step = step->next)
switch(step->type) {
case HOST_TYPE:
if (!strncasecmp(step->name, bp->ut_host, UT_HOSTSIZE))
return (YES);
break;
case TTY_TYPE:
if (!strncmp(step->name, bp->ut_line, UT_LINESIZE))
return (YES);
break;
case USER_TYPE:
if (!strncmp(step->name, bp->ut_name, UT_NAMESIZE))
return (YES);
break;
}
return (NO);
}
/*
* addarg --
* add an entry to a linked list of arguments
*/
void
addarg(int type, char *arg)
{
ARG *cur;
if ((cur = malloc(sizeof(ARG))) == NULL)
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.
*/
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)))
err(1, "gethostname");
hostdot = strchr(name, '.');
}
if (hostdot && !strcasecmp(hostdot, argdot))
*argdot = '\0';
}
/*
* ttyconv --
* convert tty to correct name.
*/
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)
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
*/
time_t
dateconv(char *arg)
{
time_t timet;
struct tm *t;
int yearset;
char *p;
/* Start with the current time. */
if (time(&timet) < 0)
err(1, "time");
if ((t = localtime(&timet)) == NULL)
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: errx(1,
"out of range or illegal time specification: [[CC]YY]MMDDhhmm[.SS]");
return timet;
}
/*
* onintr --
* on interrupt, we inform the user how far we've gotten
*/
void
onintr(int signo)
{
char ct[80];
struct tm *tm;
time_t t = _int_to_time(buf[0].ut_time);
tm = localtime(&t);
(void) strftime(ct, sizeof(ct),
d_first ? "%a %e %b %R" : "%a %b %e %R",
tm);
printf("\ninterrupted %s\n", ct);
if (signo == SIGINT)
exit(1);
(void)fflush(stdout); /* fix required for rsh */
}