/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2002 Tim J. Robbins.
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <langinfo.h>
#include <limits.h>
#include <locale.h>
#include <paths.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <timeconv.h>
#include <unistd.h>
#include <utmpx.h>
static void heading(void);
static void process_utmp(void);
static void quick(void);
static void row(const struct utmpx *);
static int ttywidth(void);
static void usage(void);
static void whoami(void);
static int Hflag; /* Write column headings */
static int aflag; /* Print all entries */
static int bflag; /* Show date of the last reboot */
static int mflag; /* Show info about current terminal */
static int qflag; /* "Quick" mode */
static int sflag; /* Show name, line, time */
static int Tflag; /* Show terminal state */
static int uflag; /* Show idle time */
int
main(int argc, char *argv[])
{
int ch;
setlocale(LC_TIME, "");
while ((ch = getopt(argc, argv, "HTabmqsu")) != -1) {
switch (ch) {
case 'H': /* Write column headings */
Hflag = 1;
break;
case 'T': /* Show terminal state */
Tflag = 1;
break;
case 'a': /* Same as -bdlprtTu */
aflag = bflag = Tflag = uflag = 1;
break;
case 'b': /* Show date of the last reboot */
bflag = 1;
break;
case 'm': /* Show info about current terminal */
mflag = 1;
break;
case 'q': /* "Quick" mode */
qflag = 1;
break;
case 's': /* Show name, line, time */
sflag = 1;
break;
case 'u': /* Show idle time */
uflag = 1;
break;
default:
usage();
/*NOTREACHED*/
}
}
argc -= optind;
argv += optind;
if (argc >= 2 && strcmp(argv[0], "am") == 0 &&
(strcmp(argv[1], "i") == 0 || strcmp(argv[1], "I") == 0)) {
/* "who am i" or "who am I", equivalent to -m */
mflag = 1;
argc -= 2;
argv += 2;
}
if (argc > 1)
usage();
if (*argv != NULL) {
if (setutxdb(UTXDB_ACTIVE, *argv) != 0)
err(1, "%s", *argv);
}
if (qflag)
quick();
else {
if (sflag)
Tflag = uflag = 0;
if (Hflag)
heading();
if (mflag)
whoami();
else
process_utmp();
}
endutxent();
exit(0);
}
static void
usage(void)
{
fprintf(stderr, "usage: who [-abHmqsTu] [am I] [file]\n");
exit(1);
}
static void
heading(void)
{
printf("%-16s ", "NAME");
if (Tflag)
printf("S ");
printf("%-12s %-12s ", "LINE", "TIME");
if (uflag)
printf("IDLE ");
printf("%-16s\n", "FROM");
}
static void
row(const struct utmpx *ut)
{
char buf[80], tty[PATH_MAX];
struct stat sb;
time_t idle, t;
static int d_first = -1;
struct tm *tm;
char state;
if (d_first < 0)
d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
state = '?';
idle = 0;
if (Tflag || uflag) {
snprintf(tty, sizeof(tty), "%s%s", _PATH_DEV, ut->ut_line);
if (stat(tty, &sb) == 0) {
state = sb.st_mode & (S_IWOTH|S_IWGRP) ?
'+' : '-';
idle = time(NULL) - sb.st_mtime;
}
}
printf("%-16s ", ut->ut_user);
if (Tflag)
printf("%c ", state);
if (ut->ut_type == BOOT_TIME)
printf("%-12s ", "system boot");
else
printf("%-12s ", ut->ut_line);
t = ut->ut_tv.tv_sec;
tm = localtime(&t);
strftime(buf, sizeof(buf), d_first ? "%e %b %R" : "%b %e %R", tm);
printf("%-*s ", 12, buf);
if (uflag) {
if (idle < 60)
printf(" . ");
else if (idle < 24 * 60 * 60)
printf("%02d:%02d ", (int)(idle / 60 / 60),
(int)(idle / 60 % 60));
else
printf(" old ");
}
if (*ut->ut_host != '\0')
printf("(%s)", ut->ut_host);
putchar('\n');
}
static int
ttystat(char *line)
{
struct stat sb;
char ttybuf[MAXPATHLEN];
(void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line);
if (stat(ttybuf, &sb) == 0) {
return (0);
} else
return (-1);
}
static void
process_utmp(void)
{
struct utmpx *utx;
while ((utx = getutxent()) != NULL) {
if (((aflag || !bflag) && utx->ut_type == USER_PROCESS) ||
(bflag && utx->ut_type == BOOT_TIME))
if (ttystat(utx->ut_line) == 0)
row(utx);
}
}
static void
quick(void)
{
struct utmpx *utx;
int col, ncols, num;
ncols = ttywidth();
col = num = 0;
while ((utx = getutxent()) != NULL) {
if (utx->ut_type != USER_PROCESS)
continue;
printf("%-16s", utx->ut_user);
if (++col < ncols / (16 + 1))
putchar(' ');
else {
col = 0;
putchar('\n');
}
num++;
}
if (col != 0)
putchar('\n');
printf("# users = %d\n", num);
}
static void
whoami(void)
{
struct utmpx ut, *utx;
struct passwd *pwd;
const char *name, *tty;
if ((tty = ttyname(STDIN_FILENO)) == NULL)
tty = "tty??";
else if (strncmp(tty, _PATH_DEV, sizeof _PATH_DEV - 1) == 0)
tty += sizeof _PATH_DEV - 1;
strlcpy(ut.ut_line, tty, sizeof ut.ut_line);
/* Search utmp for our tty, dump first matching record. */
if ((utx = getutxline(&ut)) != NULL && utx->ut_type == USER_PROCESS) {
row(utx);
return;
}
/* Not found; fill the utmp structure with the information we have. */
memset(&ut, 0, sizeof(ut));
if ((pwd = getpwuid(getuid())) != NULL)
name = pwd->pw_name;
else
name = "?";
strlcpy(ut.ut_user, name, sizeof ut.ut_user);
gettimeofday(&ut.ut_tv, NULL);
row(&ut);
}
static int
ttywidth(void)
{
struct winsize ws;
long width;
char *cols, *ep;
if ((cols = getenv("COLUMNS")) != NULL && *cols != '\0') {
errno = 0;
width = strtol(cols, &ep, 10);
if (errno || width <= 0 || width > INT_MAX || ep == cols ||
*ep != '\0')
warnx("invalid COLUMNS environment variable ignored");
else
return (width);
}
if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) != -1)
return (ws.ws_col);
return (80);
}
