File: [local] / src / usr.bin / last / last.c (download)
Revision 1.5, Sun Jul 20 09:07:17 1997 UTC (26 years, 10 months ago) by jdm
Branch: MAIN
Changes since 1.4: +59 -11 lines
minor cleanup on the -d flag code
|
/* $OpenBSD: last.c,v 1.5 1997/07/20 09:07:17 jdm Exp $ */
/* $NetBSD: last.c,v 1.6 1994/12/24 16:49:02 cgd Exp $ */
/*
* 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 char copyright[] =
"@(#) Copyright (c) 1987, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)last.c 8.2 (Berkeley) 4/2/94";
#endif
static char rcsid[] = "$OpenBSD: last.c,v 1.5 1997/07/20 09:07:17 jdm Exp $";
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <err.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <tzfile.h>
#include <unistd.h>
#include <utmp.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 */
typedef struct ttytab {
time_t logout; /* log out time */
char tty[UT_LINESIZE + 1]; /* terminal name */
struct ttytab *next; /* linked list pointer */
} TTY;
TTY *ttylist; /* head of linked list */
static time_t currentout; /* current logout value */
static long maxrec; /* records to display */
static char *file = _PATH_WTMP; /* wtmp file */
static time_t snaptime; /* if != 0, we will only
* report users logged in
* at this snapshot time
*/
void addarg __P((int, char *));
TTY *addtty __P((char *));
void hostconv __P((char *));
void onintr __P((int));
char *ttyconv __P((char *));
time_t dateconv __P((char *));
int want __P((struct utmp *, int));
void wtmp __P((void));
void checkargs __P((void));
int
main(argc, argv)
int argc;
char *argv[];
{
extern int optind;
extern char *optarg;
int ch;
char *p;
maxrec = -1;
snaptime = 0;
while ((ch = getopt(argc, argv, "0123456789f:h:t:d:")) != -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 = argv[optind - 1];
if (p[0] == '-' && p[1] == ch && !p[2])
maxrec = atol(++p);
else
maxrec = atol(argv[optind] + 1);
if (!maxrec)
exit(0);
}
break;
case 'f':
file = optarg;
break;
case 'h':
hostconv(optarg);
addarg(HOST_TYPE, optarg);
break;
case 't':
addarg(TTY_TYPE, ttyconv(optarg));
break;
case 'd':
snaptime = dateconv(optarg);
break;
case '?':
default:
(void)fprintf(stderr,
"usage: last [-#] [-f file] [-t tty]"
" [-h host] [-d [MMDD]hhmm[.SS]]"
" [user ...]\n");
exit(1);
}
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);
}
}
checkargs();
wtmp();
exit(0);
}
/*
* checkargs --
* if snaptime is set, print warning if usernames, or -t or -h
* flags are also provided
*/
void
checkargs()
{
ARG *step;
int ttyflag = 0;
if (!snaptime)
return;
if (!arglist)
return;
for (step = arglist; step; step = step->next)
switch (step->type) {
case HOST_TYPE:
(void)fprintf(stderr, "Warning: Ignoring hostname "
"flag\n");
break;
case TTY_TYPE:
if (!ttyflag) { /* don't print this twice */
(void)fprintf(stderr, "Warning: Ignoring "
"tty flag\n");
ttyflag = 1;
}
break;
case USER_TYPE:
(void)fprintf(stderr, "Warning: Ignoring "
"username[s]\n");
break;
default:
/* PRINT NOTHING */
}
}
/*
* wtmp --
* read through the wtmp file
*/
void
wtmp()
{
struct utmp *bp; /* current structure */
TTY *T; /* tty list entry */
struct stat stb; /* stat of file for size */
time_t bl, delta; /* time difference */
int bytes, wfd;
char *ct, *crmsg;
int snapfound = 0; /* found snapshot entry? */
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(&buf[0].ut_time);
(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) {
/*
* 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 (T = ttylist; T; T = T->next)
T->logout = -bp->ut_time;
currentout = -bp->ut_time;
crmsg = strncmp(bp->ut_name, "shutdown",
UT_NAMESIZE) ? "crash" : "shutdown";
/*
* if we're in snapshop mode, we want to
* exit if this shutdown/reboot appears
* while we we are tracking the active
* range
*/
if (snaptime && snapfound)
return;
/*
* don't print shutdown/reboot entries
* unless flagged for
*/
if (want(bp, NO)) {
ct = ctime(&bp->ut_time);
printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n",
UT_NAMESIZE, UT_NAMESIZE,
bp->ut_name, UT_LINESIZE,
UT_LINESIZE, bp->ut_line,
UT_HOSTSIZE, UT_HOSTSIZE,
bp->ut_host, ct, ct + 11);
if (maxrec != -1 && !--maxrec)
return;
}
continue;
}
/*
* 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, NO)) {
ct = ctime(&bp->ut_time);
printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s \n",
UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
UT_LINESIZE, UT_LINESIZE, bp->ut_line,
UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
ct, ct + 11);
if (maxrec && !--maxrec)
return;
}
continue;
}
/* find associated tty */
for (T = ttylist;; T = T->next) {
if (!T) {
/* add new one */
T = addtty(bp->ut_line);
break;
}
if (!strncmp(T->tty, bp->ut_line, UT_LINESIZE))
break;
}
/*
* print record if not in snapshot mode and wanted
* or in snapshot mode and in snapshot range
*/
if (bp->ut_name[0] &&
((want(bp, YES)) ||
(bp->ut_time < snaptime &&
(T->logout > snaptime || !T->logout ||
T->logout < 0)))) {
snapfound = 1;
ct = ctime(&bp->ut_time);
printf("%-*.*s %-*.*s %-*.*s %10.10s %5.5s ",
UT_NAMESIZE, UT_NAMESIZE, bp->ut_name,
UT_LINESIZE, UT_LINESIZE, bp->ut_line,
UT_HOSTSIZE, UT_HOSTSIZE, bp->ut_host,
ct, ct + 11);
if (!T->logout)
puts(" still logged in");
else {
if (T->logout < 0) {
T->logout = -T->logout;
printf("- %s", crmsg);
}
else
printf("- %5.5s",
ctime(&T->logout)+11);
delta = T->logout - bp->ut_time;
if (delta < SECSPERDAY)
printf(" (%5.5s)\n",
asctime(gmtime(&delta))+11);
else
printf(" (%ld+%5.5s)\n",
delta / SECSPERDAY,
asctime(gmtime(&delta))+11);
}
if (maxrec != -1 && !--maxrec)
return;
}
T->logout = bp->ut_time;
}
}
ct = ctime(&buf[0].ut_time);
printf("\nwtmp begins %10.10s %5.5s \n", ct, ct + 11);
}
/*
* want --
* see if want this entry
*/
int
want(bp, check)
struct utmp *bp;
int check;
{
ARG *step;
if (check)
/*
* 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';
if (snaptime) /* if snaptime is set, return NO */
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(type, arg)
int type;
char *arg;
{
ARG *cur;
if (!(cur = (ARG *)malloc((u_int)sizeof(ARG))))
err(1, "malloc failure");
cur->next = arglist;
cur->type = type;
cur->name = arg;
arglist = cur;
}
/*
* addtty --
* add an entry to a linked list of ttys
*/
TTY *
addtty(ttyname)
char *ttyname;
{
TTY *cur;
if (!(cur = (TTY *)malloc((u_int)sizeof(TTY))))
err(1, "malloc failure");
cur->next = ttylist;
cur->logout = currentout;
memmove(cur->tty, ttyname, UT_LINESIZE);
return (ttylist = 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(arg)
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(arg)
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((u_int)8)))
err(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][MMDD]hhmm[.SS]] to a time_t.
* Derived from atime_arg1() in usr.bin/touch/touch.c
*/
time_t
dateconv(arg)
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][MMDD]hhmm[.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;
/* FALLTHOUGH */
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][MMDD]hhmm[.SS]");
return timet;
}
/*
* onintr --
* on interrupt, we inform the user how far we've gotten
*/
void
onintr(signo)
int signo;
{
char *ct;
ct = ctime(&buf[0].ut_time);
printf("\ninterrupted %10.10s %5.5s \n", ct, ct + 11);
if (signo == SIGINT)
exit(1);
(void)fflush(stdout); /* fix required for rsh */
}
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