1 /* $OpenBSD: w.c,v 1.70 2024/09/15 07:14:58 jsg Exp $ */
2
3 /*-
4 * Copyright (c) 1980, 1991, 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 /*
33 * w - print system status (who and what)
34 *
35 * This program is similar to the systat command on Tenex/Tops 10/20
36 *
37 */
38 #include <sys/time.h>
39 #include <sys/stat.h>
40 #include <sys/sysctl.h>
41 #include <sys/signal.h>
42 #include <sys/proc.h>
43 #include <sys/ioctl.h>
44 #include <sys/socket.h>
45 #include <sys/tty.h>
46
47 #include <netinet/in.h>
48 #include <arpa/inet.h>
49
50 #include <ctype.h>
51 #include <err.h>
52 #include <errno.h>
53 #include <fcntl.h>
54 #include <kvm.h>
55 #include <netdb.h>
56 #include <nlist.h>
57 #include <paths.h>
58 #include <stdio.h>
59 #include <stdlib.h>
60 #include <string.h>
61 #include <unistd.h>
62 #include <limits.h>
63 #include <utmp.h>
64 #include <vis.h>
65
66 #include "extern.h"
67
68 struct utmp utmp;
69 struct winsize ws;
70 kvm_t *kd;
71 time_t now; /* the current time of day */
72 int ttywidth; /* width of tty */
73 int argwidth; /* width of tty */
74 int header = 1; /* true if -h flag: don't print heading */
75 int nflag = 1; /* true if -n flag: don't convert addrs */
76 int sortidle; /* sort by idle time */
77 char *sel_user; /* login of particular user selected */
78 char domain[HOST_NAME_MAX+1];
79
80 #define NAME_WIDTH 8
81 #define HOST_WIDTH 16
82
83 /*
84 * One of these per active utmp entry.
85 */
86 struct entry {
87 struct entry *next;
88 struct utmp utmp;
89 dev_t tdev; /* dev_t of terminal */
90 time_t idle; /* idle time of terminal in seconds */
91 struct kinfo_proc *kp; /* `most interesting' proc */
92 } *ep, *ehead = NULL, **nextp = &ehead;
93
94 static void fmt_putc(int, int *);
95 static void fmt_puts(const char *, int *);
96 static void pr_args(struct kinfo_proc *);
97 static void pr_header(time_t *, int);
98 static struct stat
99 *ttystat(char *);
100 static void usage(int);
101 static char *hostlookup(char *, char *);
102
103 int
main(int argc,char * argv[])104 main(int argc, char *argv[])
105 {
106 extern char *__progname;
107 struct kinfo_proc *kp;
108 struct stat *stp;
109 FILE *ut;
110 int ch, i, nentries, nusers, wcmd;
111 char *memf, *nlistf, *p, *x;
112 char buf[HOST_NAME_MAX+1], errbuf[_POSIX2_LINE_MAX];
113
114 /* Are we w(1) or uptime(1)? */
115 p = __progname;
116 if (*p == '-')
117 p++;
118 if (p[0] == 'w' && p[1] == '\0') {
119 wcmd = 1;
120 p = "hiflM:N:asuw";
121 } else if (!strcmp(p, "uptime")) {
122 wcmd = 0;
123 p = "";
124 } else
125 errx(1,
126 "this program should be invoked only as \"w\" or \"uptime\"");
127
128 memf = nlistf = NULL;
129 while ((ch = getopt(argc, argv, p)) != -1)
130 switch (ch) {
131 case 'h':
132 header = 0;
133 break;
134 case 'i':
135 sortidle = 1;
136 break;
137 case 'M':
138 header = 0;
139 memf = optarg;
140 break;
141 case 'N':
142 nlistf = optarg;
143 break;
144 case 'a':
145 nflag = 0;
146 break;
147 case 'f': case 'l': case 's': case 'u': case 'w':
148 warnx("[-flsuw] no longer supported");
149 /* FALLTHROUGH */
150 default:
151 usage(wcmd);
152 }
153 argc -= optind;
154 argv += optind;
155
156 if (nflag == 0) {
157 if (pledge("stdio tty rpath dns ps vminfo", NULL) == -1)
158 err(1, "pledge");
159 } else {
160 if (pledge("stdio tty rpath ps vminfo", NULL) == -1)
161 err(1, "pledge");
162 }
163
164 if (nlistf == NULL && memf == NULL) {
165 if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES,
166 errbuf)) == NULL)
167 errx(1, "%s", errbuf);
168 } else {
169 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
170 errx(1, "%s", errbuf);
171 }
172
173 (void)time(&now);
174 if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
175 err(1, "%s", _PATH_UTMP);
176
177 if (*argv)
178 sel_user = *argv;
179
180 for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
181 if (utmp.ut_name[0] == '\0')
182 continue;
183 ++nusers;
184 if (wcmd == 0 || (sel_user &&
185 strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
186 continue;
187 if ((ep = calloc(1, sizeof(*ep))) == NULL)
188 err(1, NULL);
189 *nextp = ep;
190 nextp = &(ep->next);
191 memcpy(&(ep->utmp), &utmp, sizeof(utmp));
192 if (!(stp = ttystat(ep->utmp.ut_line)))
193 continue;
194 ep->tdev = stp->st_rdev;
195
196 /*
197 * If this is the console device, attempt to ascertain
198 * the true console device dev_t.
199 */
200 if (ep->tdev == 0) {
201 int mib[2];
202 size_t size;
203
204 mib[0] = CTL_KERN;
205 mib[1] = KERN_CONSDEV;
206 size = sizeof(dev_t);
207 (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
208 }
209
210 if ((ep->idle = now - stp->st_atime) < 0)
211 ep->idle = 0;
212 }
213 (void)fclose(ut);
214
215 if (header || wcmd == 0) {
216 pr_header(&now, nusers);
217 if (wcmd == 0)
218 exit (0);
219 }
220
221 #define HEADER "USER TTY FROM LOGIN@ IDLE WHAT"
222 #define WUSED (sizeof(HEADER) - sizeof("WHAT"))
223 if (header)
224 (void)puts(HEADER);
225
226 kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries);
227 if (kp == NULL)
228 errx(1, "%s", kvm_geterr(kd));
229
230 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
231 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
232 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
233 ttywidth = 79;
234 else
235 ttywidth = ws.ws_col - 1;
236 argwidth = ttywidth - WUSED;
237 if (argwidth < 4)
238 argwidth = 8;
239
240 for (i = 0; i < nentries; i++, kp++) {
241 if (kp->p_psflags & (PS_EMBRYO | PS_ZOMBIE))
242 continue;
243 for (ep = ehead; ep != NULL; ep = ep->next) {
244 /* ftp is a special case. */
245 if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) {
246 char pidstr[UT_LINESIZE-2];
247 pid_t fp;
248
249 (void)strncpy(pidstr, &ep->utmp.ut_line[3],
250 sizeof(pidstr) - 1);
251 pidstr[sizeof(pidstr) - 1] = '\0';
252 fp = (pid_t)strtol(pidstr, NULL, 10);
253 if (kp->p_pid == fp) {
254 ep->kp = kp;
255 break;
256 }
257 } else if (ep->tdev == kp->p_tdev &&
258 kp->p__pgid == kp->p_tpgid) {
259 /*
260 * Proc is in foreground of this terminal
261 */
262 if (proc_compare(ep->kp, kp))
263 ep->kp = kp;
264 break;
265 }
266 }
267 }
268 /* sort by idle time */
269 if (sortidle && ehead != NULL) {
270 struct entry *from = ehead, *save;
271
272 ehead = NULL;
273 while (from != NULL) {
274 for (nextp = &ehead;
275 (*nextp) && from->idle >= (*nextp)->idle;
276 nextp = &(*nextp)->next)
277 continue;
278 save = from;
279 from = from->next;
280 save->next = *nextp;
281 *nextp = save;
282 }
283 }
284
285 if (!nflag) {
286 if (gethostname(domain, sizeof(domain)) == -1 ||
287 (p = strchr(domain, '.')) == 0)
288 domain[0] = '\0';
289 else {
290 domain[sizeof(domain) - 1] = '\0';
291 memmove(domain, p, strlen(p) + 1);
292 }
293 }
294
295 for (ep = ehead; ep != NULL; ep = ep->next) {
296 p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
297 for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++) {
298 if (p[i] == ':') {
299 x = &p[i];
300 *x++ = '\0';
301 break;
302 }
303 }
304
305 if (x) {
306 (void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
307 (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x);
308 p = buf;
309 }
310
311 if (!nflag) {
312 char *tmp;
313
314 if ((tmp = hostlookup(p, domain)) != NULL)
315 p = tmp;
316 }
317
318 (void)printf("%-*.*s %-2.2s %-*.*s ",
319 NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name,
320 strncmp(ep->utmp.ut_line, "tty", 3) ?
321 ep->utmp.ut_line : ep->utmp.ut_line + 3,
322 HOST_WIDTH, HOST_WIDTH, *p ? p : "-");
323 pr_attime(&ep->utmp.ut_time, &now);
324 pr_idle(ep->idle);
325 pr_args(ep->kp);
326 printf("\n");
327 }
328 exit(0);
329 }
330
331 static void
fmt_putc(int c,int * leftp)332 fmt_putc(int c, int *leftp)
333 {
334
335 if (*leftp == 0)
336 return;
337 if (*leftp != -1)
338 *leftp -= 1;
339 putchar(c);
340 }
341
342 static void
fmt_puts(const char * s,int * leftp)343 fmt_puts(const char *s, int *leftp)
344 {
345 static char *v = NULL;
346 static size_t maxlen = 0;
347 size_t len;
348
349 if (*leftp == 0)
350 return;
351 len = strlen(s) * 4 + 1;
352 if (len > maxlen) {
353 free(v);
354 maxlen = 0;
355 if (len < getpagesize())
356 len = getpagesize();
357 v = malloc(len);
358 if (v == NULL)
359 return;
360 maxlen = len;
361 }
362 strvis(v, s, VIS_TAB | VIS_NL | VIS_CSTYLE);
363 if (*leftp != -1) {
364 len = strlen(v);
365 if (len > *leftp) {
366 v[*leftp] = '\0';
367 *leftp = 0;
368 } else
369 *leftp -= len;
370 }
371 printf("%s", v);
372 }
373
374
375 static void
pr_args(struct kinfo_proc * kp)376 pr_args(struct kinfo_proc *kp)
377 {
378 char **argv, *str;
379 int left;
380
381 if (kp == NULL)
382 goto nothing; /* no matching process found */
383 left = argwidth;
384 argv = kvm_getargv(kd, kp, argwidth+60); /* +60 for ftpd snip */
385 if (argv == NULL)
386 goto nothing;
387
388 if (*argv == NULL || **argv == '\0') {
389 /* Process has zeroed argv[0], display executable name. */
390 fmt_putc('(', &left);
391 fmt_puts(kp->p_comm, &left);
392 fmt_putc(')', &left);
393 }
394 while (*argv) {
395 /*
396 * ftp argv[0] is in the following format:
397 * ftpd: HOSTNAME: [USER/PASS: ]CMD args (ftpd)
398 */
399 if (strncmp(*argv, "ftpd:", 5) == 0) {
400 if ((str = strchr(*argv + 5, ':')) != NULL)
401 str = strchr(str + 1, ':');
402 if (str != NULL) {
403 if ((str[0] == ':') &&
404 isspace((unsigned char)str[1]))
405 str += 2;
406 fmt_puts(str, &left);
407 } else
408 fmt_puts(*argv, &left);
409 } else
410 fmt_puts(*argv, &left);
411 argv++;
412 fmt_putc(' ', &left);
413 }
414 return;
415 nothing:
416 putchar('-');
417 }
418
419 static void
pr_header(time_t * nowp,int nusers)420 pr_header(time_t *nowp, int nusers)
421 {
422 double avenrun[3];
423 struct timespec boottime;
424 time_t uptime;
425 int days, hrs, i, mins;
426 char buf[256];
427
428 /*
429 * Print time of day.
430 */
431 (void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp));
432 buf[sizeof(buf) - 1] = '\0';
433 (void)printf("%s ", buf);
434
435 /*
436 * Print how long system has been up.
437 */
438 if (clock_gettime(CLOCK_BOOTTIME, &boottime) != -1) {
439 uptime = boottime.tv_sec;
440 if (uptime > 59) {
441 uptime += 30;
442 days = uptime / SECSPERDAY;
443 uptime %= SECSPERDAY;
444 hrs = uptime / SECSPERHOUR;
445 uptime %= SECSPERHOUR;
446 mins = uptime / 60;
447 (void)printf(" up");
448 if (days > 0)
449 (void)printf(" %d day%s,", days,
450 days > 1 ? "s" : "");
451 if (hrs > 0 && mins > 0)
452 (void)printf(" %2d:%02d,", hrs, mins);
453 else {
454 if (hrs > 0)
455 (void)printf(" %d hr%s,",
456 hrs, hrs > 1 ? "s" : "");
457 if (mins > 0 || (days == 0 && hrs == 0))
458 (void)printf(" %d min%s,",
459 mins, mins != 1 ? "s" : "");
460 }
461 } else
462 printf(" %d secs,", (int)uptime);
463 }
464
465 /* Print number of users logged in to system */
466 (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");
467
468 /*
469 * Print 1, 5, and 15 minute load averages.
470 */
471 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
472 (void)printf(", no load average information available\n");
473 else {
474 (void)printf(", load averages:");
475 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
476 if (i > 0)
477 (void)printf(",");
478 (void)printf(" %.2f", avenrun[i]);
479 }
480 (void)printf("\n");
481 }
482 }
483
484 static struct stat *
ttystat(char * line)485 ttystat(char *line)
486 {
487 static struct stat sb;
488 char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE];
489
490 /* Note, line may not be NUL-terminated */
491 (void)strlcpy(ttybuf, _PATH_DEV, sizeof(ttybuf));
492 (void)strncat(ttybuf, line, sizeof(ttybuf) - 1 - strlen(ttybuf));
493 if (stat(ttybuf, &sb))
494 return (NULL);
495 return (&sb);
496 }
497
498 static void
usage(int wcmd)499 usage(int wcmd)
500 {
501 if (wcmd)
502 (void)fprintf(stderr,
503 "usage: w [-ahi] [-M core] [-N system] [user]\n");
504 else
505 (void)fprintf(stderr,
506 "usage: uptime\n");
507 exit (1);
508 }
509
510 static char*
hostlookup(char * host,char * domain)511 hostlookup(char *host, char *domain)
512 {
513 static char buf[NI_MAXHOST];
514 struct addrinfo hints, *res;
515 int error;
516 char *p;
517
518 memset(&hints, 0, sizeof(hints));
519 if (getaddrinfo(host, NULL, &hints, &res) != 0)
520 return NULL;
521
522 error = getnameinfo(res->ai_addr, res->ai_addr->sa_len, buf,
523 sizeof(buf), NULL, 0, 0);
524 freeaddrinfo(res);
525
526 if (error)
527 return NULL;
528
529 if (domain[0] != '\0') {
530 p = buf;
531 p += strlen(buf);
532 p -= strlen(domain);
533 if (p > buf && strcasecmp(p, domain) == 0)
534 *p = '\0';
535 }
536 return buf;
537 }
538