/*-
* SPDX-License-Identifier: BSD-3-Clause
*
* Copyright (c) 1983, 1993 The Regents of the University of California.
* Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org>
* 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. 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) 1983, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)rwho.c 8.1 (Berkeley) 6/6/93";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
#include <sys/capsicum.h>
#include <sys/param.h>
#include <sys/file.h>
#include <protocols/rwhod.h>
#include <capsicum_helpers.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <langinfo.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <timeconv.h>
#include <unistd.h>
#define NUSERS 1000
#define WHDRSIZE (ssize_t)(sizeof(wd) - sizeof(wd.wd_we))
/*
* this macro should be shared with ruptime.
*/
#define down(w,now) ((now) - (w)->wd_recvtime > 11 * 60)
static DIR *dirp;
static struct whod wd;
static int nusers;
static struct myutmp {
char myhost[sizeof(wd.wd_hostname)];
int myidle;
struct outmp myutmp;
} myutmp[NUSERS];
static time_t now;
static int aflg;
static void usage(void) __dead2;
static int utmpcmp(const void *, const void *);
int
main(int argc, char *argv[])
{
int ch;
struct dirent *dp;
int width;
ssize_t cc;
struct whod *w;
struct whoent *we;
struct myutmp *mp;
cap_rights_t rights;
int f, n, i;
int d_first;
int dfd;
time_t ct;
w = &wd;
(void) setlocale(LC_TIME, "");
d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
while ((ch = getopt(argc, argv, "a")) != -1) {
switch ((char)ch) {
case 'a':
aflg = 1;
break;
case '?':
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc != 0)
usage();
if (chdir(_PATH_RWHODIR) < 0)
err(1, "chdir(%s)", _PATH_RWHODIR);
if ((dirp = opendir(".")) == NULL)
err(1, "opendir(%s)", _PATH_RWHODIR);
dfd = dirfd(dirp);
mp = myutmp;
cap_rights_init(&rights, CAP_READ, CAP_LOOKUP);
if (caph_rights_limit(dfd, &rights) < 0)
err(1, "cap_rights_limit failed: %s", _PATH_RWHODIR);
/*
* Cache files required for time(3) and localtime(3) before entering
* capability mode.
*/
(void) time(&ct);
(void) localtime(&ct);
if (caph_enter() < 0)
err(1, "cap_enter");
(void) time(&now);
cap_rights_init(&rights, CAP_READ);
while ((dp = readdir(dirp)) != NULL) {
if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5) != 0)
continue;
f = openat(dfd, dp->d_name, O_RDONLY);
if (f < 0)
continue;
if (caph_rights_limit(f, &rights) < 0)
err(1, "cap_rights_limit failed: %s", dp->d_name);
cc = read(f, (char *)&wd, sizeof(struct whod));
if (cc < WHDRSIZE) {
(void) close(f);
continue;
}
if (down(w, now) != 0) {
(void) close(f);
continue;
}
cc -= WHDRSIZE;
we = w->wd_we;
for (n = cc / sizeof(struct whoent); n > 0; n--) {
if (aflg == 0 && we->we_idle >= 60 * 60) {
we++;
continue;
}
if (nusers >= NUSERS)
errx(1, "too many users");
mp->myutmp = we->we_utmp;
mp->myidle = we->we_idle;
(void) strcpy(mp->myhost, w->wd_hostname);
nusers++;
we++;
mp++;
}
(void) close(f);
}
qsort((char *)myutmp, nusers, sizeof(struct myutmp), utmpcmp);
mp = myutmp;
width = 0;
for (i = 0; i < nusers; i++) {
/* append one for the blank and use 8 for the out_line */
int j;
j = strlen(mp->myhost) + 1 + sizeof(mp->myutmp.out_line);
if (j > width)
width = j;
mp++;
}
mp = myutmp;
for (i = 0; i < nusers; i++) {
char buf[BUFSIZ], cbuf[80];
time_t t;
t = _int_to_time(mp->myutmp.out_time);
strftime(cbuf, sizeof(cbuf), d_first ? "%e %b %R" : "%b %e %R",
localtime(&t));
(void) sprintf(buf, "%s:%-.*s", mp->myhost,
(int)sizeof(mp->myutmp.out_line), mp->myutmp.out_line);
printf("%-*.*s %-*s %s",
(int)sizeof(mp->myutmp.out_name),
(int)sizeof(mp->myutmp.out_name),
mp->myutmp.out_name, width, buf, cbuf);
mp->myidle /= 60;
if (mp->myidle != 0) {
if (aflg != 0) {
if (mp->myidle >= 100 * 60)
mp->myidle = 100 * 60 - 1;
if (mp->myidle >= 60)
printf(" %2d", mp->myidle / 60);
else
printf(" ");
} else {
printf(" ");
}
printf(":%02d", mp->myidle % 60);
}
printf("\n");
mp++;
}
exit(0);
}
static void
usage(void)
{
fprintf(stderr, "usage: rwho [-a]\n");
exit(1);
}
#define MYUTMP(a) ((const struct myutmp *)(a))
static int
utmpcmp(const void *u1, const void *u2)
{
int rc;
rc = strncmp(MYUTMP(u1)->myutmp.out_name, MYUTMP(u2)->myutmp.out_name,
sizeof(MYUTMP(u2)->myutmp.out_name));
if (rc != 0)
return (rc);
rc = strcmp(MYUTMP(u1)->myhost, MYUTMP(u2)->myhost);
if (rc != 0)
return (rc);
return (strncmp(MYUTMP(u1)->myutmp.out_line,
MYUTMP(u2)->myutmp.out_line, sizeof(MYUTMP(u2)->myutmp.out_line)));
}
plain