1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
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 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1983, 1993, 1994\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #ifndef lint
39 static const char sccsid[] = "@(#)ruptime.c 8.2 (Berkeley) 4/5/94";
40 #endif /* not lint */
41
42 #include <sys/cdefs.h>
43 __FBSDID("$FreeBSD$");
44
45 #include <sys/param.h>
46
47 #include <protocols/rwhod.h>
48
49 #include <dirent.h>
50 #include <err.h>
51 #include <errno.h>
52 #include <fcntl.h>
53 #include <stdio.h>
54 #include <stdlib.h>
55 #include <string.h>
56 #include <time.h>
57 #include <unistd.h>
58
59 static struct hs {
60 struct whod hs_wd;
61 int hs_nusers;
62 } *hs;
63 #define LEFTEARTH(h) (now - (h) > 4*24*60*60)
64 #define ISDOWN(h) (now - (h)->hs_wd.wd_recvtime > 11 * 60)
65 #define WHDRSIZE __offsetof(struct whod, wd_we)
66
67 static size_t nhosts;
68 static time_t now;
69 static int rflg = 1;
70 static DIR *dirp;
71
72 static int hscmp(const void *, const void *);
73 static char *interval(time_t, const char *);
74 static int iwidth(int);
75 static int lcmp(const void *, const void *);
76 static void ruptime(const char *, int, int (*)(const void *, const void *));
77 static int tcmp(const void *, const void *);
78 static int ucmp(const void *, const void *);
79 static void usage(void);
80
81 int
main(int argc,char * argv[])82 main(int argc, char *argv[])
83 {
84 int (*cmp)(const void *, const void *);
85 int aflg, ch;
86
87 aflg = 0;
88 cmp = hscmp;
89 while ((ch = getopt(argc, argv, "alrut")) != -1)
90 switch (ch) {
91 case 'a':
92 aflg = 1;
93 break;
94 case 'l':
95 cmp = lcmp;
96 break;
97 case 'r':
98 rflg = -1;
99 break;
100 case 't':
101 cmp = tcmp;
102 break;
103 case 'u':
104 cmp = ucmp;
105 break;
106 default:
107 usage();
108 }
109 argc -= optind;
110 argv += optind;
111
112 if (chdir(_PATH_RWHODIR) || (dirp = opendir(".")) == NULL)
113 err(1, "%s", _PATH_RWHODIR);
114
115 ruptime(*argv, aflg, cmp);
116 while (*argv++ != NULL) {
117 if (*argv == NULL)
118 break;
119 ruptime(*argv, aflg, cmp);
120 }
121 exit(0);
122 }
123
124 static char *
interval(time_t tval,const char * updown)125 interval(time_t tval, const char *updown)
126 {
127 static char resbuf[32];
128 int days, hours, minutes;
129
130 if (tval < 0) {
131 (void)snprintf(resbuf, sizeof(resbuf), "%s ??:??", updown);
132 return (resbuf);
133 }
134 /* Round to minutes. */
135 minutes = (tval + (60 - 1)) / 60;
136 hours = minutes / 60;
137 minutes %= 60;
138 days = hours / 24;
139 hours %= 24;
140 if (days)
141 (void)snprintf(resbuf, sizeof(resbuf),
142 "%s %4d+%02d:%02d", updown, days, hours, minutes);
143 else
144 (void)snprintf(resbuf, sizeof(resbuf),
145 "%s %2d:%02d", updown, hours, minutes);
146 return (resbuf);
147 }
148
149 /* Width to print a small nonnegative integer. */
150 static int
iwidth(int w)151 iwidth(int w)
152 {
153 if (w < 10)
154 return (1);
155 if (w < 100)
156 return (2);
157 if (w < 1000)
158 return (3);
159 if (w < 10000)
160 return (4);
161 return (5);
162 }
163
164 #define HS(a) ((const struct hs *)(a))
165
166 /* Alphabetical comparison. */
167 static int
hscmp(const void * a1,const void * a2)168 hscmp(const void *a1, const void *a2)
169 {
170 return (rflg *
171 strcmp(HS(a1)->hs_wd.wd_hostname, HS(a2)->hs_wd.wd_hostname));
172 }
173
174 /* Load average comparison. */
175 static int
lcmp(const void * a1,const void * a2)176 lcmp(const void *a1, const void *a2)
177 {
178 if (ISDOWN(HS(a1)))
179 if (ISDOWN(HS(a2)))
180 return (tcmp(a1, a2));
181 else
182 return (rflg);
183 else if (ISDOWN(HS(a2)))
184 return (-rflg);
185 else
186 return (rflg *
187 (HS(a2)->hs_wd.wd_loadav[0] - HS(a1)->hs_wd.wd_loadav[0]));
188 }
189
190 static void
ruptime(const char * host,int aflg,int (* cmp)(const void *,const void *))191 ruptime(const char *host, int aflg, int (*cmp)(const void *, const void *))
192 {
193 struct hs *hsp;
194 struct whod *wd;
195 struct whoent *we;
196 struct dirent *dp;
197 int fd, hostnamewidth, i, loadavwidth[3], userswidth, w;
198 size_t hspace;
199 ssize_t cc;
200
201 rewinddir(dirp);
202 hsp = NULL;
203 hostnamewidth = 0;
204 loadavwidth[0] = 4;
205 loadavwidth[1] = 4;
206 loadavwidth[2] = 4;
207 userswidth = 1;
208 (void)time(&now);
209 for (nhosts = hspace = 0; (dp = readdir(dirp)) != NULL;) {
210 if (dp->d_ino == 0 || strncmp(dp->d_name, "whod.", 5) != 0)
211 continue;
212 if ((fd = open(dp->d_name, O_RDONLY, 0)) < 0) {
213 warn("%s", dp->d_name);
214 continue;
215 }
216
217 if (nhosts == hspace) {
218 if ((hs =
219 realloc(hs, (hspace += 40) * sizeof(*hs))) == NULL)
220 err(1, NULL);
221 hsp = hs + nhosts;
222 }
223
224 wd = &hsp->hs_wd;
225 cc = read(fd, wd, sizeof(*wd));
226 (void)close(fd);
227 if (cc < (ssize_t)WHDRSIZE)
228 continue;
229
230 if (host != NULL && strcasecmp(wd->wd_hostname, host) != 0)
231 continue;
232 if (LEFTEARTH(wd->wd_recvtime))
233 continue;
234
235 if (hostnamewidth < (int)strlen(wd->wd_hostname))
236 hostnamewidth = (int)strlen(wd->wd_hostname);
237 for (i = 0; i < 3; i++) {
238 w = iwidth(wd->wd_loadav[i] / 100) + 3;
239 if (loadavwidth[i] < w)
240 loadavwidth[i] = w;
241 }
242
243 for (hsp->hs_nusers = 0, we = &wd->wd_we[0];
244 (char *)(we + 1) <= (char *)wd + cc; we++)
245 if (aflg || we->we_idle < 3600)
246 ++hsp->hs_nusers;
247 if (userswidth < iwidth(hsp->hs_nusers))
248 userswidth = iwidth(hsp->hs_nusers);
249 ++hsp;
250 ++nhosts;
251 }
252 if (nhosts == 0) {
253 if (host == NULL)
254 errx(1, "no hosts in %s", _PATH_RWHODIR);
255 else
256 warnx("host %s not in %s", host, _PATH_RWHODIR);
257 }
258
259 qsort(hs, nhosts, sizeof(hs[0]), cmp);
260 w = userswidth + loadavwidth[0] + loadavwidth[1] + loadavwidth[2];
261 if (hostnamewidth + w > 41)
262 hostnamewidth = 41 - w; /* limit to 79 cols */
263 for (i = 0; i < (int)nhosts; i++) {
264 hsp = &hs[i];
265 wd = &hsp->hs_wd;
266 if (ISDOWN(hsp)) {
267 (void)printf("%-*.*s %s\n",
268 hostnamewidth, hostnamewidth, wd->wd_hostname,
269 interval(now - hsp->hs_wd.wd_recvtime, "down"));
270 continue;
271 }
272 (void)printf(
273 "%-*.*s %s, %*d user%s load %*.2f, %*.2f, %*.2f\n",
274 hostnamewidth, hostnamewidth, wd->wd_hostname,
275 interval((time_t)wd->wd_sendtime -
276 (time_t)wd->wd_boottime, " up"),
277 userswidth, hsp->hs_nusers,
278 hsp->hs_nusers == 1 ? ", " : "s,",
279 loadavwidth[0], wd->wd_loadav[0] / 100.0,
280 loadavwidth[1], wd->wd_loadav[1] / 100.0,
281 loadavwidth[2], wd->wd_loadav[2] / 100.0);
282 }
283 free(hs);
284 hs = NULL;
285 }
286
287 /* Number of users comparison. */
288 static int
ucmp(const void * a1,const void * a2)289 ucmp(const void *a1, const void *a2)
290 {
291 if (ISDOWN(HS(a1)))
292 if (ISDOWN(HS(a2)))
293 return (tcmp(a1, a2));
294 else
295 return (rflg);
296 else if (ISDOWN(HS(a2)))
297 return (-rflg);
298 else
299 return (rflg * (HS(a2)->hs_nusers - HS(a1)->hs_nusers));
300 }
301
302 /* Uptime comparison. */
303 static int
tcmp(const void * a1,const void * a2)304 tcmp(const void *a1, const void *a2)
305 {
306 return (rflg * (
307 (ISDOWN(HS(a2)) ? HS(a2)->hs_wd.wd_recvtime - now
308 : HS(a2)->hs_wd.wd_sendtime - HS(a2)->hs_wd.wd_boottime)
309 -
310 (ISDOWN(HS(a1)) ? HS(a1)->hs_wd.wd_recvtime - now
311 : HS(a1)->hs_wd.wd_sendtime - HS(a1)->hs_wd.wd_boottime)
312 ));
313 }
314
315 static void
usage(void)316 usage(void)
317 {
318 (void)fprintf(stderr, "usage: ruptime [-alrtu] [host ...]\n");
319 exit(1);
320 }
321