251 lines
6.3 KiB
C
251 lines
6.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1983, 1993 The Regents of the University of California.
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* Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1983, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)rwho.c 8.1 (Berkeley) 6/6/93";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/capsicum.h>
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#include <sys/param.h>
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#include <sys/file.h>
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#include <protocols/rwhod.h>
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#include <capsicum_helpers.h>
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#include <dirent.h>
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#include <err.h>
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#include <errno.h>
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#include <langinfo.h>
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#include <locale.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <timeconv.h>
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#include <unistd.h>
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#define NUSERS 1000
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#define WHDRSIZE (ssize_t)(sizeof(wd) - sizeof(wd.wd_we))
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/*
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* this macro should be shared with ruptime.
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*/
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#define down(w,now) ((now) - (w)->wd_recvtime > 11 * 60)
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static DIR *dirp;
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static struct whod wd;
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static int nusers;
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static struct myutmp {
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char myhost[sizeof(wd.wd_hostname)];
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int myidle;
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struct outmp myutmp;
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} myutmp[NUSERS];
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static time_t now;
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static int aflg;
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static void usage(void);
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static int utmpcmp(const void *, const void *);
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int
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main(int argc, char *argv[])
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{
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int ch;
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struct dirent *dp;
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int width;
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ssize_t cc;
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struct whod *w;
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struct whoent *we;
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struct myutmp *mp;
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cap_rights_t rights;
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int f, n, i;
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int d_first;
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int dfd;
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time_t ct;
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w = &wd;
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(void) setlocale(LC_TIME, "");
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d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
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while ((ch = getopt(argc, argv, "a")) != -1) {
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switch ((char)ch) {
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case 'a':
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aflg = 1;
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break;
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case '?':
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc != 0)
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usage();
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if (chdir(_PATH_RWHODIR) < 0)
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err(1, "chdir(%s)", _PATH_RWHODIR);
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if ((dirp = opendir(".")) == NULL)
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err(1, "opendir(%s)", _PATH_RWHODIR);
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dfd = dirfd(dirp);
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mp = myutmp;
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cap_rights_init(&rights, CAP_READ, CAP_LOOKUP);
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if (caph_rights_limit(dfd, &rights) < 0)
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err(1, "cap_rights_limit failed: %s", _PATH_RWHODIR);
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/*
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* Cache files required for time(3) and localtime(3) before entering
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* capability mode.
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*/
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(void) time(&ct);
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(void) localtime(&ct);
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if (caph_enter() < 0)
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err(1, "cap_enter");
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(void) time(&now);
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cap_rights_init(&rights, CAP_READ);
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while ((dp = readdir(dirp)) != NULL) {
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if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5) != 0)
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continue;
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f = openat(dfd, dp->d_name, O_RDONLY);
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if (f < 0)
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continue;
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if (caph_rights_limit(f, &rights) < 0)
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err(1, "cap_rights_limit failed: %s", dp->d_name);
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cc = read(f, (char *)&wd, sizeof(struct whod));
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if (cc < WHDRSIZE) {
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(void) close(f);
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continue;
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}
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if (down(w, now) != 0) {
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(void) close(f);
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continue;
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}
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cc -= WHDRSIZE;
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we = w->wd_we;
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for (n = cc / sizeof(struct whoent); n > 0; n--) {
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if (aflg == 0 && we->we_idle >= 60 * 60) {
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we++;
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continue;
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}
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if (nusers >= NUSERS)
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errx(1, "too many users");
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mp->myutmp = we->we_utmp;
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mp->myidle = we->we_idle;
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(void) strcpy(mp->myhost, w->wd_hostname);
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nusers++;
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we++;
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mp++;
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}
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(void) close(f);
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}
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qsort((char *)myutmp, nusers, sizeof(struct myutmp), utmpcmp);
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mp = myutmp;
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width = 0;
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for (i = 0; i < nusers; i++) {
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/* append one for the blank and use 8 for the out_line */
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int j;
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j = strlen(mp->myhost) + 1 + sizeof(mp->myutmp.out_line);
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if (j > width)
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width = j;
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mp++;
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}
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mp = myutmp;
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for (i = 0; i < nusers; i++) {
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char buf[BUFSIZ], cbuf[80];
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time_t t;
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t = _int_to_time(mp->myutmp.out_time);
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strftime(cbuf, sizeof(cbuf), d_first ? "%e %b %R" : "%b %e %R",
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localtime(&t));
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(void) sprintf(buf, "%s:%-.*s", mp->myhost,
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(int)sizeof(mp->myutmp.out_line), mp->myutmp.out_line);
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printf("%-*.*s %-*s %s",
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(int)sizeof(mp->myutmp.out_name),
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(int)sizeof(mp->myutmp.out_name),
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mp->myutmp.out_name, width, buf, cbuf);
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mp->myidle /= 60;
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if (mp->myidle != 0) {
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if (aflg != 0) {
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if (mp->myidle >= 100 * 60)
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mp->myidle = 100 * 60 - 1;
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if (mp->myidle >= 60)
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printf(" %2d", mp->myidle / 60);
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else
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printf(" ");
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} else {
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printf(" ");
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}
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printf(":%02d", mp->myidle % 60);
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}
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printf("\n");
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mp++;
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}
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exit(0);
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}
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static void
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usage(void)
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{
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fprintf(stderr, "usage: rwho [-a]\n");
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exit(1);
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}
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#define MYUTMP(a) ((const struct myutmp *)(a))
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static int
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utmpcmp(const void *u1, const void *u2)
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{
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int rc;
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rc = strncmp(MYUTMP(u1)->myutmp.out_name, MYUTMP(u2)->myutmp.out_name,
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sizeof(MYUTMP(u2)->myutmp.out_name));
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if (rc != 0)
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return (rc);
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rc = strcmp(MYUTMP(u1)->myhost, MYUTMP(u2)->myhost);
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if (rc != 0)
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return (rc);
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return (strncmp(MYUTMP(u1)->myutmp.out_line,
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MYUTMP(u2)->myutmp.out_line, sizeof(MYUTMP(u2)->myutmp.out_line)));
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}
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