1/*	$NetBSD: ruptime.c,v 1.14 2009/04/13 07:10:25 lukem Exp $	*/
2
3/*
4 * Copyright (c) 1983, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1983, 1993, 1994\
35 The Regents of the University of California.  All rights reserved.");
36#endif /* not lint */
37
38#ifndef lint
39/*static char sccsid[] = "from: @(#)ruptime.c	8.2 (Berkeley) 4/5/94";*/
40__RCSID("$NetBSD: ruptime.c,v 1.14 2009/04/13 07:10:25 lukem Exp $");
41#endif /* not lint */
42
43#include <sys/param.h>
44
45#include <protocols/rwhod.h>
46
47#include <dirent.h>
48#include <err.h>
49#include <errno.h>
50#include <fcntl.h>
51#include <stdio.h>
52#include <stdlib.h>
53#include <string.h>
54#include <time.h>
55#include <tzfile.h>
56#include <unistd.h>
57
58static struct hs {
59	struct	whod *hs_wd;
60	int	hs_nusers;
61} *hs;
62
63#define	ISDOWN(h)	(now - (h)->hs_wd->wd_recvtime > 11 * 60)
64#define	WHDRSIZE	(sizeof(struct whod) - \
65    sizeof (((struct whod *)0)->wd_we))
66
67static size_t nhosts;
68static time_t now;
69static int rflg = 1;
70
71static int	 hscmp(const void *, const void *);
72static char	*interval(time_t, const char *);
73static int	 lcmp(const void *, const void *);
74static int	 tcmp(const void *, const void *);
75static int	 ucmp(const void *, const void *);
76__dead static void	 usage(void);
77
78int
79main(int argc, char **argv)
80{
81	struct dirent *dp;
82	struct hs *hsp;
83	struct whod *wd;
84	struct whoent *we;
85	DIR *dirp;
86	size_t hspace, i;
87	int aflg, cc, ch, fd, maxloadav;
88	char buf[sizeof(struct whod)];
89	int (*cmp)(const void *, const void *);
90
91	hsp = NULL;
92	aflg = 0;
93	cmp = hscmp;
94	while ((ch = getopt(argc, argv, "alrtu")) != -1)
95		switch (ch) {
96		case 'a':
97			aflg = 1;
98			break;
99		case 'l':
100			cmp = lcmp;
101			break;
102		case 'r':
103			rflg = -1;
104			break;
105		case 't':
106			cmp = tcmp;
107			break;
108		case 'u':
109			cmp = ucmp;
110			break;
111		default:
112			usage();
113		}
114	argc -= optind;
115	argv += optind;
116
117	if (argc != 0)
118		usage();
119
120	if (chdir(_PATH_RWHODIR) || (dirp = opendir(".")) == NULL)
121		err(1, "%s", _PATH_RWHODIR);
122
123	maxloadav = -1;
124	for (nhosts = hspace = 0; (dp = readdir(dirp)) != NULL;) {
125		if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5))
126			continue;
127		if ((fd = open(dp->d_name, O_RDONLY, 0)) < 0) {
128			warn("%s", dp->d_name);
129			continue;
130		}
131		cc = read(fd, buf, sizeof(struct whod));
132		(void)close(fd);
133
134		if (cc < (int)WHDRSIZE)
135			continue;
136		if (nhosts == hspace) {
137			if ((hs =
138			    realloc(hs, (hspace += 40) * sizeof(*hs))) == NULL)
139				err(1, "realloc");
140			hsp = hs + nhosts;
141		}
142
143		if ((hsp->hs_wd = malloc((size_t)WHDRSIZE)) == NULL)
144			err(1, "malloc");
145		memmove(hsp->hs_wd, buf, (size_t)WHDRSIZE);
146
147		for (wd = (struct whod *)buf, i = 0; i < 2; ++i)
148			if (wd->wd_loadav[i] > maxloadav)
149				maxloadav = wd->wd_loadav[i];
150
151		for (hsp->hs_nusers = 0,
152		    we = (struct whoent *)(buf + cc); --we >= wd->wd_we;)
153			if (aflg || we->we_idle < 3600)
154				++hsp->hs_nusers;
155		++hsp;
156		++nhosts;
157	}
158	if (nhosts == 0)
159		errx(0, "no hosts in %s", _PATH_RWHODIR);
160
161	(void)time(&now);
162	qsort(hs, nhosts, sizeof (hs[0]), cmp);
163	for (i = 0; i < nhosts; i++) {
164		hsp = &hs[i];
165		if (ISDOWN(hsp)) {
166			(void)printf("%-12.12s%s\n", hsp->hs_wd->wd_hostname,
167			    interval(now - hsp->hs_wd->wd_recvtime, "down"));
168			continue;
169		}
170		(void)printf(
171		    "%-12.12s%s,  %4d user%s  load %*.2f, %*.2f, %*.2f\n",
172		    hsp->hs_wd->wd_hostname,
173		    interval((time_t)hsp->hs_wd->wd_sendtime -
174			(time_t)hsp->hs_wd->wd_boottime, "  up"),
175		    hsp->hs_nusers,
176		    hsp->hs_nusers == 1 ? ", " : "s,",
177		    maxloadav >= 1000 ? 5 : 4,
178			hsp->hs_wd->wd_loadav[0] / 100.0,
179		    maxloadav >= 1000 ? 5 : 4,
180		        hsp->hs_wd->wd_loadav[1] / 100.0,
181		    maxloadav >= 1000 ? 5 : 4,
182		        hsp->hs_wd->wd_loadav[2] / 100.0);
183	}
184	exit(0);
185}
186
187static char *
188interval(time_t tval, const char *updown)
189{
190	static char resbuf[32];
191	int days, hours, minutes;
192
193	if (tval < 0) {
194		(void)snprintf(resbuf, sizeof(resbuf), "   %s ??:??", updown);
195		return (resbuf);
196	}
197						/* round to minutes. */
198	minutes = (tval + (SECSPERMIN - 1)) / SECSPERMIN;
199	hours = minutes / MINSPERHOUR;
200	minutes %= MINSPERHOUR;
201	days = hours / HOURSPERDAY;
202	hours %= HOURSPERDAY;
203	if (days)
204		(void)snprintf(resbuf, sizeof(resbuf),
205		    "%s%4d+%02d:%02d", updown, days, hours, minutes);
206	else
207		(void)snprintf(resbuf, sizeof(resbuf),
208		    "%s     %2d:%02d", updown, hours, minutes);
209	return (resbuf);
210}
211
212#define	HS(a)	((const struct hs *)(a))
213
214/* Alphabetical comparison. */
215static int
216hscmp(const void *a1, const void *a2)
217{
218	return (rflg *
219	    strcmp(HS(a1)->hs_wd->wd_hostname, HS(a2)->hs_wd->wd_hostname));
220}
221
222/* Load average comparison. */
223static int
224lcmp(const void *a1, const void *a2)
225{
226	if (ISDOWN(HS(a1))) {
227		if (ISDOWN(HS(a2)))
228			return (tcmp(a1, a2));
229		else
230			return (rflg);
231	} else if (ISDOWN(HS(a2))) {
232		return (-rflg);
233	} else
234		return (rflg *
235		   (HS(a2)->hs_wd->wd_loadav[0] - HS(a1)->hs_wd->wd_loadav[0]));
236}
237
238/* Number of users comparison. */
239static int
240ucmp(const void *a1, const void *a2)
241{
242	if (ISDOWN(HS(a1))) {
243		if (ISDOWN(HS(a2)))
244			return (tcmp(a1, a2));
245		else
246			return (rflg);
247	} else if (ISDOWN(HS(a2))) {
248		return (-rflg);
249	} else
250		return (rflg * (HS(a2)->hs_nusers - HS(a1)->hs_nusers));
251}
252
253/* Uptime comparison. */
254static int
255tcmp(const void *a1, const void *a2)
256{
257	return (rflg * (
258		(ISDOWN(HS(a2)) ? HS(a2)->hs_wd->wd_recvtime - now
259		    : HS(a2)->hs_wd->wd_sendtime - HS(a2)->hs_wd->wd_boottime)
260		-
261		(ISDOWN(HS(a1)) ? HS(a1)->hs_wd->wd_recvtime - now
262		    : HS(a1)->hs_wd->wd_sendtime - HS(a1)->hs_wd->wd_boottime)
263	));
264}
265
266static void
267usage(void)
268{
269	(void)fprintf(stderr, "usage: ruptime [-alrtu]\n");
270	exit(1);
271}
272