1 /*-
2 * Copyright (c) 1980, 1991, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#) Copyright (c) 1980, 1991, 1993, 1994 The Regents of the University of California. All rights reserved.
30 * @(#)w.c 8.4 (Berkeley) 4/16/94
31 * $FreeBSD: src/usr.bin/w/w.c,v 1.38.2.6 2002/03/12 19:51:51 phantom Exp $
32 */
33
34 /*
35 * w - print system status (who and what)
36 *
37 * This program is similar to the systat command on Tenex/Tops 10/20
38 *
39 */
40 #include <sys/user.h>
41 #include <sys/param.h>
42 #include <sys/time.h>
43 #include <sys/stat.h>
44 #include <sys/sysctl.h>
45 #include <sys/ioctl.h>
46 #include <sys/socket.h>
47 #include <sys/tty.h>
48
49 #include <machine/cpu.h>
50 #include <netinet/in.h>
51 #include <arpa/inet.h>
52
53 #include <ctype.h>
54 #include <err.h>
55 #include <errno.h>
56 #include <fcntl.h>
57 #include <kvm.h>
58 #include <limits.h>
59 #include <langinfo.h>
60 #include <locale.h>
61 #include <netdb.h>
62 #include <nlist.h>
63 #include <paths.h>
64 #include <stdio.h>
65 #include <stdlib.h>
66 #include <string.h>
67 #include <unistd.h>
68 #include <utmpx.h>
69 #include <vis.h>
70
71 #include <arpa/nameser.h>
72 #include <resolv.h>
73
74 #include "extern.h"
75
76 static struct winsize ws;
77 static kvm_t *kd;
78 static time_t now; /* the current time of day */
79 static time_t then;
80 static int ttywidth; /* width of tty */
81 static int argwidth; /* width of tty */
82 static int header = 1; /* true if -h flag: don't print heading */
83 static int nflag; /* true if -n flag: don't convert addrs */
84 static int dflag; /* true if -d flag: output debug info */
85 static int sortidle; /* sort by idle time */
86 int use_ampm; /* use AM/PM time */
87 static int use_comma; /* use comma as floats separator */
88 static char **sel_users; /* login array of particular users selected */
89 static char domain[MAXHOSTNAMELEN];
90 static int maxname = 8, maxline = 3, maxhost = 16;
91
92 struct kplist {
93 struct kplist *next;
94 struct kinfo_proc *kp;
95 };
96
97 /*
98 * One of these per active utmpx entry.
99 */
100 static struct entry {
101 struct entry *next;
102 char name[UTX_USERSIZE + 1];
103 char line[UTX_LINESIZE + 1];
104 char host[UTX_HOSTSIZE + 1];
105 char type[2];
106 struct timeval tv;
107 dev_t tdev; /* dev_t of terminal */
108 time_t idle; /* idle time of terminal in seconds */
109 struct kinfo_proc *kp; /* `most interesting' proc */
110 char *args; /* arg list of interesting process */
111 struct kplist *list; /* debug option proc list */
112 pid_t pid; /* pid or ~0 if not known */
113 } *ep, *ehead = NULL, **nextp = &ehead;
114
115 static void pr_header(time_t *, int);
116 static struct stat *ttystat(char *, int);
117 static void process(struct entry *);
118 static void usage(int);
119 static int this_is_uptime(const char *s);
120
121 char *fmt_argv(char **, char *, int); /* ../../bin/ps/fmt.c */
122
123 int
main(int argc,char ** argv)124 main(int argc, char **argv)
125 {
126 struct kinfo_proc *kp;
127 struct kplist *scan;
128 struct hostent *hp;
129 in_addr_t l;
130 int ch, i, nentries, nusers, wcmd, longidle, dropgid;
131 char *memf, *nlistf, *p, *x;
132 struct utmpx *utx;
133 char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
134
135 (void)setlocale(LC_ALL, "");
136 use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
137 use_comma = (*nl_langinfo(RADIXCHAR) != ',');
138
139 /* Are we w(1) or uptime(1)? */
140 if (this_is_uptime(argv[0]) == 0) {
141 wcmd = 0;
142 p = "";
143 } else {
144 wcmd = 1;
145 p = "dhiflM:N:nsuw";
146 }
147
148 dropgid = 0;
149 memf = nlistf = _PATH_DEVNULL;
150 while ((ch = getopt(argc, argv, p)) != -1)
151 switch (ch) {
152 case 'd':
153 dflag = 1;
154 break;
155 case 'h':
156 header = 0;
157 break;
158 case 'i':
159 sortidle = 1;
160 break;
161 case 'M':
162 header = 0;
163 memf = optarg;
164 dropgid = 1;
165 break;
166 case 'N':
167 nlistf = optarg;
168 dropgid = 1;
169 break;
170 case 'n':
171 nflag = 1;
172 break;
173 case 'f': case 'l': case 's': case 'u': case 'w':
174 warnx("[-flsuw] no longer supported");
175 /* FALLTHROUGH */
176 case '?':
177 default:
178 usage(wcmd);
179 }
180 argc -= optind;
181 argv += optind;
182
183 if (!(_res.options & RES_INIT))
184 res_init();
185 _res.retrans = 2; /* resolver timeout to 2 seconds per try */
186 _res.retry = 1; /* only try once.. */
187
188 /*
189 * Discard setgid privileges if not the running kernel so that bad
190 * guys can't print interesting stuff from kernel memory.
191 */
192 if (dropgid)
193 setgid(getgid());
194
195 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
196 errx(1, "%s", errbuf);
197
198 (void)time(&now);
199 setutxent();
200
201 if (*argv)
202 sel_users = argv;
203
204 nusers = 0;
205 while ((utx = getutxent()) != NULL) {
206 if (utx->ut_type != USER_PROCESS)
207 continue;
208 ++nusers;
209
210 if (sel_users) {
211 int usermatch;
212 char **user;
213
214 usermatch = 0;
215 for (user = sel_users; !usermatch && *user; user++)
216 if (!strncmp(utx->ut_name, *user, UTX_USERSIZE))
217 usermatch = 1;
218 if (!usermatch)
219 continue;
220 }
221
222 if ((ep = calloc(1, sizeof(struct entry))) == NULL)
223 err(1, NULL);
224 (void)memcpy(ep->name, utx->ut_name, sizeof(utx->ut_name));
225 (void)memcpy(ep->line, utx->ut_line, sizeof(utx->ut_line));
226 (void)memcpy(ep->host, utx->ut_host, sizeof(utx->ut_host));
227 ep->name[sizeof(utx->ut_name)] = '\0';
228 ep->line[sizeof(utx->ut_line)] = '\0';
229 ep->host[sizeof(utx->ut_host)] = '\0';
230 #if 1
231 /* XXX: Actually we don't support the utx->ut_ss stuff yet */
232 if (!nflag || getnameinfo((struct sockaddr *)&utx->ut_ss,
233 utx->ut_ss.ss_len, ep->host, sizeof(ep->host), NULL, 0,
234 NI_NUMERICHOST) != 0) {
235 (void)memcpy(ep->host, utx->ut_host,
236 sizeof(utx->ut_host));
237 ep->host[sizeof(utx->ut_host)] = '\0';
238 }
239 #endif
240 ep->type[0] = 'x';
241 ep->tv = utx->ut_tv;
242 ep->pid = utx->ut_pid;
243
244 *nextp = ep;
245 nextp = &(ep->next);
246 if (wcmd != 0)
247 process(ep);
248 }
249 endutxent();
250
251 if (header || wcmd == 0) {
252 pr_header(&now, nusers);
253 if (wcmd == 0) {
254 (void)kvm_close(kd);
255 exit(0);
256 }
257
258 #define HEADER_USER "USER"
259 #define HEADER_TTY "TTY"
260 #define HEADER_FROM "FROM"
261 #define HEADER_LOGIN_IDLE "LOGIN@ IDLE "
262 #define HEADER_WHAT "WHAT\n"
263 #define WUSED (maxname + maxline + maxhost + \
264 sizeof(HEADER_LOGIN_IDLE) + 3) /* header width incl. spaces */
265 (void)printf("%-*.*s %-*.*s %-*.*s %s",
266 maxname, maxname, HEADER_USER,
267 maxline, maxline, HEADER_TTY,
268 maxhost, maxhost, HEADER_FROM,
269 HEADER_LOGIN_IDLE HEADER_WHAT);
270 }
271
272 if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
273 err(1, "%s", kvm_geterr(kd));
274 for (i = 0; i < nentries; i++, kp++) {
275 /*
276 * login(1) is a special case.
277 */
278 if (strcmp(kp->kp_comm, "login") == 0)
279 continue;
280 if (kp->kp_stat == SIDL || kp->kp_stat == SZOMB)
281 continue;
282 if (kp->kp_sid != kp->kp_tsid)
283 continue;
284 for (ep = ehead; ep != NULL; ep = ep->next) {
285 if (ep->tdev == kp->kp_tdev) {
286 /*
287 * proc is associated with this terminal
288 */
289 if (ep->kp == NULL &&
290 kp->kp_pgid == kp->kp_tpgid)
291 {
292 /*
293 * Proc is 'most interesting'
294 */
295 if (proc_compare(ep->kp, kp))
296 ep->kp = kp;
297 }
298 /*
299 * Retain list of kinfo_proc's for -d
300 * option.
301 */
302 scan = malloc(sizeof(*scan));
303 scan->kp = kp;
304 scan->next = ep->list;
305 ep->list = scan;
306 }
307 if (ep->pid != 0 && ep->pid == kp->kp_pid) {
308 ep->kp = kp;
309 break;
310 }
311 }
312 }
313 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
314 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
315 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
316 ttywidth = 79;
317 else
318 ttywidth = ws.ws_col - 1;
319 argwidth = ttywidth - WUSED;
320 if (argwidth < 4)
321 argwidth = 8;
322 for (ep = ehead; ep != NULL; ep = ep->next) {
323 if (ep->kp == NULL) {
324 ep->args = "-";
325 continue;
326 }
327 ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
328 ep->kp->kp_comm, MAXCOMLEN);
329 if (ep->args == NULL)
330 err(1, NULL);
331 }
332 /* sort by idle time */
333 if (sortidle && ehead != NULL) {
334 struct entry *from, *save;
335
336 from = ehead;
337 ehead = NULL;
338 while (from != NULL) {
339 for (nextp = &ehead;
340 (*nextp) && from->idle >= (*nextp)->idle;
341 nextp = &(*nextp)->next)
342 continue;
343 save = from;
344 from = from->next;
345 save->next = *nextp;
346 *nextp = save;
347 }
348 } else if (ehead != NULL) {
349 struct entry *from = ehead, *save;
350
351 ehead = NULL;
352 while (from != NULL) {
353 for (nextp = &ehead;
354 (*nextp) && strcmp(from->line, (*nextp)->line) > 0;
355 nextp = &(*nextp)->next)
356 continue;
357 save = from;
358 from = from->next;
359 save->next = *nextp;
360 *nextp = save;
361 }
362 }
363
364 if (!nflag) {
365 if (gethostname(domain, sizeof(domain)) < 0 ||
366 (p = strchr(domain, '.')) == NULL)
367 domain[0] = '\0';
368 else {
369 domain[sizeof(domain) - 1] = '\0';
370 memmove(domain, p, strlen(p) + 1);
371 }
372 }
373
374 for (ep = ehead; ep != NULL; ep = ep->next) {
375 char host_buf[UTX_HOSTSIZE + 1];
376
377 host_buf[UTX_HOSTSIZE] = '\0';
378 strncpy(host_buf, ep->host, maxhost);
379 p = *host_buf ? host_buf : "-";
380 if ((x = strchr(p, ':')) != NULL)
381 *x++ = '\0';
382 if (!nflag && isdigit(*p) &&
383 (l = inet_addr(p)) != INADDR_NONE &&
384 (hp = gethostbyaddr(&l, sizeof(l), AF_INET))) {
385 if (domain[0] != '\0') {
386 p = hp->h_name;
387 p += strlen(hp->h_name);
388 p -= strlen(domain);
389 if (p > hp->h_name &&
390 strcasecmp(p, domain) == 0)
391 *p = '\0';
392 }
393 p = hp->h_name;
394 }
395 if (nflag && *p && strcmp(p, "-") &&
396 inet_addr(p) == INADDR_NONE) {
397 hp = gethostbyname(p);
398
399 if (hp != NULL) {
400 struct in_addr in;
401
402 memmove(&in, hp->h_addr, sizeof(in));
403 p = inet_ntoa(in);
404 }
405 }
406 if (x) {
407 (void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
408 p = buf;
409 }
410 if (dflag) {
411 for (scan = ep->list; scan; scan = scan->next) {
412 char *ptr;
413
414 ptr = fmt_argv(kvm_getargv(kd, scan->kp,
415 argwidth),
416 scan->kp->kp_comm,
417 MAXCOMLEN);
418 if (ptr == NULL)
419 ptr = "-";
420 printf("\t\t%-9d %s\n", scan->kp->kp_pid, ptr);
421 }
422 }
423 (void)printf("%-*.*s %-*.*s %-*.*s ",
424 maxname, maxname, ep->name,
425 maxline, maxline,
426 strncmp(ep->line, "tty", 3) &&
427 strncmp(ep->line, "cua", 3) ?
428 ep->line : ep->line + 3,
429 maxhost, maxhost, *p ? p : "-");
430 then = (time_t)ep->tv.tv_sec;
431 pr_attime(&then, &now);
432 longidle = pr_idle(ep->idle);
433 (void)printf("%.*s\n", argwidth - longidle, ep->args);
434 }
435 (void)kvm_close(kd);
436 exit(0);
437 }
438
439 static void
pr_header(time_t * nowp,int nusers)440 pr_header(time_t *nowp, int nusers)
441 {
442 struct timespec boot_ts;
443 double avenrun[3];
444 time_t uptime;
445 int days, hrs, i, mins, secs;
446 char buf[256];
447
448 /*
449 * Print time of day. (use "AM"/"PM" for all locales)
450 */
451 (void)strftime_l(buf, sizeof(buf) - 1,
452 use_ampm ? "%l:%M%p" : "%k:%M",
453 localtime(nowp), NULL);
454 buf[sizeof(buf) - 1] = '\0';
455 (void)printf("%s ", buf);
456
457 /*
458 * Print how long system has been up.
459 *
460 * Use clock_gettime() rather than trying to calculate
461 * a realtime delta that would be subject to time and date
462 * changes.
463 */
464 if (clock_gettime(CLOCK_UPTIME, &boot_ts) == 0) {
465 uptime = boot_ts.tv_sec;
466 if (uptime > 60)
467 uptime += 30;
468 days = uptime / 86400;
469 uptime %= 86400;
470 hrs = uptime / 3600;
471 uptime %= 3600;
472 mins = uptime / 60;
473 secs = uptime % 60;
474 (void)printf(" up");
475 if (days > 0)
476 (void)printf(" %d day%s,", days, days > 1 ? "s" : "");
477 if (hrs > 0 && mins > 0)
478 (void)printf(" %2d:%02d,", hrs, mins);
479 else if (hrs > 0)
480 (void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
481 else if (mins > 0)
482 (void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
483 else
484 (void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
485 }
486
487 /* Print number of users logged in on system */
488 (void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
489
490 /*
491 * Print 1, 5, and 15 minute load averages.
492 */
493 if (getloadavg(avenrun, NELEM(avenrun)) == -1)
494 (void)printf(", no load average information available\n");
495 else {
496 (void)printf(", load averages:");
497 for (i = 0; i < (int)NELEM(avenrun); i++) {
498 if (use_comma && i > 0)
499 (void)printf(",");
500 (void)printf(" %.2f", avenrun[i]);
501 }
502 (void)printf("\n");
503 }
504 }
505
506 static struct stat *
ttystat(char * line,int sz)507 ttystat(char *line, int sz)
508 {
509 static struct stat sb;
510 char ttybuf[MAXPATHLEN];
511
512 (void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
513 if (stat(ttybuf, &sb)) {
514 warn("%s", ttybuf);
515 return (NULL);
516 }
517 return (&sb);
518 }
519
520 static void
usage(int wcmd)521 usage(int wcmd)
522 {
523 if (wcmd)
524 (void)fprintf(stderr,
525 "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
526 else
527 (void)fprintf(stderr, "usage: uptime\n");
528 exit(1);
529 }
530
531 static int
this_is_uptime(const char * s)532 this_is_uptime(const char *s)
533 {
534 const char *u;
535
536 if ((u = strrchr(s, '/')) != NULL)
537 ++u;
538 else
539 u = s;
540 if (strcmp(u, "uptime") == 0)
541 return (0);
542 return (-1);
543 }
544
545 static void
process(struct entry * ep)546 process(struct entry *ep)
547 {
548 struct stat *stp;
549 time_t touched;
550 int max;
551
552 if ((max = strlen(ep->name)) > maxname)
553 maxname = max;
554 if ((max = strlen(ep->line)) > maxline)
555 maxline = max;
556 if ((max = strlen(ep->host)) > maxhost)
557 maxhost = max;
558
559 ep->tdev = 0;
560 ep->idle = (time_t)-1;
561
562 if (!(stp = ttystat(ep->line, maxline)))
563 return; /* corrupted record */
564
565 ep->tdev = stp->st_rdev;
566 #ifdef CPU_CONSDEV
567 /*
568 * If this is the console device, attempt to ascertain
569 * the true console device dev_t.
570 */
571 if (ep->tdev == 0) {
572 int mib[2];
573 size_t size;
574
575 mib[0] = CTL_MACHDEP;
576 mib[1] = CPU_CONSDEV;
577 size = sizeof(dev_t);
578 (void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
579 }
580 #endif
581
582 touched = stp->st_atime;
583 if (touched < ep->tv.tv_sec) {
584 /* tty untouched since before login */
585 touched = ep->tv.tv_sec;
586 }
587 if ((ep->idle = now - touched) < 0)
588 ep->idle = 0;
589 }
590