1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1993 The Regents of the University of California.
5 * Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/capsicum.h>
34#include <sys/param.h>
35#include <sys/file.h>
36
37#include <protocols/rwhod.h>
38
39#include <capsicum_helpers.h>
40#include <dirent.h>
41#include <err.h>
42#include <errno.h>
43#include <langinfo.h>
44#include <locale.h>
45#include <stdio.h>
46#include <stdlib.h>
47#include <string.h>
48#include <time.h>
49#include <timeconv.h>
50#include <unistd.h>
51
52#define	NUSERS		1000
53#define	WHDRSIZE	(ssize_t)(sizeof(wd) - sizeof(wd.wd_we))
54/*
55 * this macro should be shared with ruptime.
56 */
57#define	down(w,now)	((now) - (w)->wd_recvtime > 11 * 60)
58
59static DIR	*dirp;
60static struct	whod wd;
61static int	nusers;
62static struct	myutmp {
63	char    myhost[sizeof(wd.wd_hostname)];
64	int	myidle;
65	struct	outmp myutmp;
66} myutmp[NUSERS];
67
68static time_t	now;
69static int	aflg;
70
71static void usage(void) __dead2;
72static int utmpcmp(const void *, const void *);
73
74int
75main(int argc, char *argv[])
76{
77	int ch;
78	struct dirent *dp;
79	int width;
80	ssize_t cc;
81	struct whod *w;
82	struct whoent *we;
83	struct myutmp *mp;
84	cap_rights_t rights;
85	int f, n, i;
86	int d_first;
87	int dfd;
88	time_t ct;
89
90	w = &wd;
91	(void) setlocale(LC_TIME, "");
92	d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
93
94	while ((ch = getopt(argc, argv, "a")) != -1) {
95		switch ((char)ch) {
96		case 'a':
97			aflg = 1;
98			break;
99		case '?':
100		default:
101			usage();
102		}
103	}
104	argc -= optind;
105	argv += optind;
106
107	if (argc != 0)
108		usage();
109
110	if (chdir(_PATH_RWHODIR) < 0)
111		err(1, "chdir(%s)", _PATH_RWHODIR);
112	if ((dirp = opendir(".")) == NULL)
113		err(1, "opendir(%s)", _PATH_RWHODIR);
114	dfd = dirfd(dirp);
115	mp = myutmp;
116	cap_rights_init(&rights, CAP_READ, CAP_LOOKUP);
117	if (caph_rights_limit(dfd, &rights) < 0)
118		err(1, "cap_rights_limit failed: %s", _PATH_RWHODIR);
119	/*
120	 * Cache files required for time(3) and localtime(3) before entering
121	 * capability mode.
122	 */
123	(void) time(&ct);
124	(void) localtime(&ct);
125	if (caph_enter() < 0)
126		err(1, "cap_enter");
127	(void) time(&now);
128	cap_rights_init(&rights, CAP_READ);
129	while ((dp = readdir(dirp)) != NULL) {
130		if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5) != 0)
131			continue;
132		f = openat(dfd, dp->d_name, O_RDONLY);
133		if (f < 0)
134			continue;
135		if (caph_rights_limit(f, &rights) < 0)
136			err(1, "cap_rights_limit failed: %s", dp->d_name);
137		cc = read(f, (char *)&wd, sizeof(struct whod));
138		if (cc < WHDRSIZE) {
139			(void) close(f);
140			continue;
141		}
142		if (down(w, now) != 0) {
143			(void) close(f);
144			continue;
145		}
146		cc -= WHDRSIZE;
147		we = w->wd_we;
148		for (n = cc / sizeof(struct whoent); n > 0; n--) {
149			if (aflg == 0 && we->we_idle >= 60 * 60) {
150				we++;
151				continue;
152			}
153			if (nusers >= NUSERS)
154				errx(1, "too many users");
155			mp->myutmp = we->we_utmp;
156			mp->myidle = we->we_idle;
157			(void) strcpy(mp->myhost, w->wd_hostname);
158			nusers++;
159			we++;
160			mp++;
161		}
162		(void) close(f);
163	}
164	qsort((char *)myutmp, nusers, sizeof(struct myutmp), utmpcmp);
165	mp = myutmp;
166	width = 0;
167	for (i = 0; i < nusers; i++) {
168		/* append one for the blank and use 8 for the out_line */
169		int j;
170
171		j = strlen(mp->myhost) + 1 + sizeof(mp->myutmp.out_line);
172		if (j > width)
173			width = j;
174		mp++;
175	}
176	mp = myutmp;
177	for (i = 0; i < nusers; i++) {
178		char buf[BUFSIZ], cbuf[80];
179		time_t t;
180
181		t = _int_to_time(mp->myutmp.out_time);
182		strftime(cbuf, sizeof(cbuf), d_first ? "%e %b %R" : "%b %e %R",
183		    localtime(&t));
184		(void) sprintf(buf, "%s:%-.*s", mp->myhost,
185		    (int)sizeof(mp->myutmp.out_line), mp->myutmp.out_line);
186		printf("%-*.*s %-*s %s",
187		    (int)sizeof(mp->myutmp.out_name),
188		    (int)sizeof(mp->myutmp.out_name),
189		    mp->myutmp.out_name, width, buf, cbuf);
190		mp->myidle /= 60;
191		if (mp->myidle != 0) {
192			if (aflg != 0) {
193				if (mp->myidle >= 100 * 60)
194					mp->myidle = 100 * 60 - 1;
195				if (mp->myidle >= 60)
196					printf(" %2d", mp->myidle / 60);
197				else
198					printf("   ");
199			} else {
200				printf(" ");
201			}
202			printf(":%02d", mp->myidle % 60);
203		}
204		printf("\n");
205		mp++;
206	}
207	exit(0);
208}
209
210
211static void
212usage(void)
213{
214
215	fprintf(stderr, "usage: rwho [-a]\n");
216	exit(1);
217}
218
219#define MYUTMP(a) ((const struct myutmp *)(a))
220
221static int
222utmpcmp(const void *u1, const void *u2)
223{
224	int rc;
225
226	rc = strncmp(MYUTMP(u1)->myutmp.out_name, MYUTMP(u2)->myutmp.out_name,
227	    sizeof(MYUTMP(u2)->myutmp.out_name));
228	if (rc != 0)
229		return (rc);
230	rc = strcmp(MYUTMP(u1)->myhost, MYUTMP(u2)->myhost);
231	if (rc != 0)
232		return (rc);
233	return (strncmp(MYUTMP(u1)->myutmp.out_line,
234	    MYUTMP(u2)->myutmp.out_line, sizeof(MYUTMP(u2)->myutmp.out_line)));
235}
236