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