1 /* $OpenBSD: w.c,v 1.68 2022/12/04 23:50:50 cheloha 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
102 int
main(int argc,char * argv[])103 main(int argc, char *argv[])
104 {
105 extern char *__progname;
106 struct kinfo_proc *kp;
107 struct hostent *hp;
108 struct stat *stp;
109 FILE *ut;
110 struct in_addr addr;
111 int ch, i, nentries, nusers, wcmd;
112 char *memf, *nlistf, *p, *x;
113 char buf[HOST_NAME_MAX+1], errbuf[_POSIX2_LINE_MAX];
114
115 /* Are we w(1) or uptime(1)? */
116 p = __progname;
117 if (*p == '-')
118 p++;
119 if (p[0] == 'w' && p[1] == '\0') {
120 wcmd = 1;
121 p = "hiflM:N:asuw";
122 } else if (!strcmp(p, "uptime")) {
123 wcmd = 0;
124 p = "";
125 } else
126 errx(1,
127 "this program should be invoked only as \"w\" or \"uptime\"");
128
129 memf = nlistf = NULL;
130 while ((ch = getopt(argc, argv, p)) != -1)
131 switch (ch) {
132 case 'h':
133 header = 0;
134 break;
135 case 'i':
136 sortidle = 1;
137 break;
138 case 'M':
139 header = 0;
140 memf = optarg;
141 break;
142 case 'N':
143 nlistf = optarg;
144 break;
145 case 'a':
146 nflag = 0;
147 break;
148 case 'f': case 'l': case 's': case 'u': case 'w':
149 warnx("[-flsuw] no longer supported");
150 /* FALLTHROUGH */
151 default:
152 usage(wcmd);
153 }
154 argc -= optind;
155 argv += optind;
156
157 if (nflag == 0) {
158 if (pledge("stdio tty rpath dns ps vminfo", NULL) == -1)
159 err(1, "pledge");
160 } else {
161 if (pledge("stdio tty rpath ps vminfo", NULL) == -1)
162 err(1, "pledge");
163 }
164
165 if (nlistf == NULL && memf == NULL) {
166 if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES,
167 errbuf)) == NULL)
168 errx(1, "%s", errbuf);
169 } else {
170 if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
171 errx(1, "%s", errbuf);
172 }
173
174 (void)time(&now);
175 if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
176 err(1, "%s", _PATH_UTMP);
177
178 if (*argv)
179 sel_user = *argv;
180
181 for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
182 if (utmp.ut_name[0] == '\0')
183 continue;
184 ++nusers;
185 if (wcmd == 0 || (sel_user &&
186 strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
187 continue;
188 if ((ep = calloc(1, sizeof(*ep))) == NULL)
189 err(1, NULL);
190 *nextp = ep;
191 nextp = &(ep->next);
192 memcpy(&(ep->utmp), &utmp, sizeof(utmp));
193 if (!(stp = ttystat(ep->utmp.ut_line)))
194 continue;
195 ep->tdev = stp->st_rdev;
196
197 /*
198 * If this is the console device, attempt to ascertain
199 * the true console device dev_t.
200 */
201 if (ep->tdev == 0) {
202 int mib[2];
203 size_t size;
204
205 mib[0] = CTL_KERN;
206 mib[1] = KERN_CONSDEV;
207 size = sizeof(dev_t);
208 (void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
209 }
210
211 if ((ep->idle = now - stp->st_atime) < 0)
212 ep->idle = 0;
213 }
214 (void)fclose(ut);
215
216 if (header || wcmd == 0) {
217 pr_header(&now, nusers);
218 if (wcmd == 0)
219 exit (0);
220 }
221
222 #define HEADER "USER TTY FROM LOGIN@ IDLE WHAT"
223 #define WUSED (sizeof(HEADER) - sizeof("WHAT"))
224 if (header)
225 (void)puts(HEADER);
226
227 kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries);
228 if (kp == NULL)
229 errx(1, "%s", kvm_geterr(kd));
230
231 if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
232 ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
233 ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
234 ttywidth = 79;
235 else
236 ttywidth = ws.ws_col - 1;
237 argwidth = ttywidth - WUSED;
238 if (argwidth < 4)
239 argwidth = 8;
240
241 for (i = 0; i < nentries; i++, kp++) {
242 if (kp->p_psflags & (PS_EMBRYO | PS_ZOMBIE))
243 continue;
244 for (ep = ehead; ep != NULL; ep = ep->next) {
245 /* ftp is a special case. */
246 if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) {
247 char pidstr[UT_LINESIZE-2];
248 pid_t fp;
249
250 (void)strncpy(pidstr, &ep->utmp.ut_line[3],
251 sizeof(pidstr) - 1);
252 pidstr[sizeof(pidstr) - 1] = '\0';
253 fp = (pid_t)strtol(pidstr, NULL, 10);
254 if (kp->p_pid == fp) {
255 ep->kp = kp;
256 break;
257 }
258 } else if (ep->tdev == kp->p_tdev &&
259 kp->p__pgid == kp->p_tpgid) {
260 /*
261 * Proc is in foreground of this terminal
262 */
263 if (proc_compare(ep->kp, kp))
264 ep->kp = kp;
265 break;
266 }
267 }
268 }
269 /* sort by idle time */
270 if (sortidle && ehead != NULL) {
271 struct entry *from = ehead, *save;
272
273 ehead = NULL;
274 while (from != NULL) {
275 for (nextp = &ehead;
276 (*nextp) && from->idle >= (*nextp)->idle;
277 nextp = &(*nextp)->next)
278 continue;
279 save = from;
280 from = from->next;
281 save->next = *nextp;
282 *nextp = save;
283 }
284 }
285
286 if (!nflag) {
287 if (gethostname(domain, sizeof(domain)) == -1 ||
288 (p = strchr(domain, '.')) == 0)
289 domain[0] = '\0';
290 else {
291 domain[sizeof(domain) - 1] = '\0';
292 memmove(domain, p, strlen(p) + 1);
293 }
294 }
295
296 for (ep = ehead; ep != NULL; ep = ep->next) {
297 p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
298 for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++)
299 if (p[i] == ':') {
300 x = &p[i];
301 *x++ = '\0';
302 break;
303 }
304 if (!nflag && inet_aton(p, &addr) &&
305 (hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) {
306 if (domain[0] != '\0') {
307 p = hp->h_name;
308 p += strlen(hp->h_name);
309 p -= strlen(domain);
310 if (p > hp->h_name &&
311 strcasecmp(p, domain) == 0)
312 *p = '\0';
313 }
314 p = hp->h_name;
315 }
316 if (x) {
317 (void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
318 (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x);
319 p = buf;
320 }
321 (void)printf("%-*.*s %-2.2s %-*.*s ",
322 NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name,
323 strncmp(ep->utmp.ut_line, "tty", 3) ?
324 ep->utmp.ut_line : ep->utmp.ut_line + 3,
325 HOST_WIDTH, HOST_WIDTH, *p ? p : "-");
326 pr_attime(&ep->utmp.ut_time, &now);
327 pr_idle(ep->idle);
328 pr_args(ep->kp);
329 printf("\n");
330 }
331 exit(0);
332 }
333
334 static void
fmt_putc(int c,int * leftp)335 fmt_putc(int c, int *leftp)
336 {
337
338 if (*leftp == 0)
339 return;
340 if (*leftp != -1)
341 *leftp -= 1;
342 putchar(c);
343 }
344
345 static void
fmt_puts(const char * s,int * leftp)346 fmt_puts(const char *s, int *leftp)
347 {
348 static char *v = NULL;
349 static size_t maxlen = 0;
350 size_t len;
351
352 if (*leftp == 0)
353 return;
354 len = strlen(s) * 4 + 1;
355 if (len > maxlen) {
356 free(v);
357 maxlen = 0;
358 if (len < getpagesize())
359 len = getpagesize();
360 v = malloc(len);
361 if (v == NULL)
362 return;
363 maxlen = len;
364 }
365 strvis(v, s, VIS_TAB | VIS_NL | VIS_CSTYLE);
366 if (*leftp != -1) {
367 len = strlen(v);
368 if (len > *leftp) {
369 v[*leftp] = '\0';
370 *leftp = 0;
371 } else
372 *leftp -= len;
373 }
374 printf("%s", v);
375 }
376
377
378 static void
pr_args(struct kinfo_proc * kp)379 pr_args(struct kinfo_proc *kp)
380 {
381 char **argv, *str;
382 int left;
383
384 if (kp == NULL)
385 goto nothing; /* no matching process found */
386 left = argwidth;
387 argv = kvm_getargv(kd, kp, argwidth+60); /* +60 for ftpd snip */
388 if (argv == NULL)
389 goto nothing;
390
391 if (*argv == NULL || **argv == '\0') {
392 /* Process has zeroed argv[0], display executable name. */
393 fmt_putc('(', &left);
394 fmt_puts(kp->p_comm, &left);
395 fmt_putc(')', &left);
396 }
397 while (*argv) {
398 /*
399 * ftp argv[0] is in the following format:
400 * ftpd: HOSTNAME: [USER/PASS: ]CMD args (ftpd)
401 */
402 if (strncmp(*argv, "ftpd:", 5) == 0) {
403 if ((str = strchr(*argv + 5, ':')) != NULL)
404 str = strchr(str + 1, ':');
405 if (str != NULL) {
406 if ((str[0] == ':') &&
407 isspace((unsigned char)str[1]))
408 str += 2;
409 fmt_puts(str, &left);
410 } else
411 fmt_puts(*argv, &left);
412 } else
413 fmt_puts(*argv, &left);
414 argv++;
415 fmt_putc(' ', &left);
416 }
417 return;
418 nothing:
419 putchar('-');
420 }
421
422 static void
pr_header(time_t * nowp,int nusers)423 pr_header(time_t *nowp, int nusers)
424 {
425 double avenrun[3];
426 struct timespec boottime;
427 time_t uptime;
428 int days, hrs, i, mins;
429 char buf[256];
430
431 /*
432 * Print time of day.
433 */
434 (void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp));
435 buf[sizeof(buf) - 1] = '\0';
436 (void)printf("%s ", buf);
437
438 /*
439 * Print how long system has been up.
440 */
441 if (clock_gettime(CLOCK_BOOTTIME, &boottime) != -1) {
442 uptime = boottime.tv_sec;
443 if (uptime > 59) {
444 uptime += 30;
445 days = uptime / SECSPERDAY;
446 uptime %= SECSPERDAY;
447 hrs = uptime / SECSPERHOUR;
448 uptime %= SECSPERHOUR;
449 mins = uptime / 60;
450 (void)printf(" up");
451 if (days > 0)
452 (void)printf(" %d day%s,", days,
453 days > 1 ? "s" : "");
454 if (hrs > 0 && mins > 0)
455 (void)printf(" %2d:%02d,", hrs, mins);
456 else {
457 if (hrs > 0)
458 (void)printf(" %d hr%s,",
459 hrs, hrs > 1 ? "s" : "");
460 if (mins > 0 || (days == 0 && hrs == 0))
461 (void)printf(" %d min%s,",
462 mins, mins != 1 ? "s" : "");
463 }
464 } else
465 printf(" %d secs,", (int)uptime);
466 }
467
468 /* Print number of users logged in to system */
469 (void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");
470
471 /*
472 * Print 1, 5, and 15 minute load averages.
473 */
474 if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
475 (void)printf(", no load average information available\n");
476 else {
477 (void)printf(", load averages:");
478 for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
479 if (i > 0)
480 (void)printf(",");
481 (void)printf(" %.2f", avenrun[i]);
482 }
483 (void)printf("\n");
484 }
485 }
486
487 static struct stat *
ttystat(char * line)488 ttystat(char *line)
489 {
490 static struct stat sb;
491 char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE];
492
493 /* Note, line may not be NUL-terminated */
494 (void)strlcpy(ttybuf, _PATH_DEV, sizeof(ttybuf));
495 (void)strncat(ttybuf, line, sizeof(ttybuf) - 1 - strlen(ttybuf));
496 if (stat(ttybuf, &sb))
497 return (NULL);
498 return (&sb);
499 }
500
501 static void
usage(int wcmd)502 usage(int wcmd)
503 {
504 if (wcmd)
505 (void)fprintf(stderr,
506 "usage: w [-ahi] [-M core] [-N system] [user]\n");
507 else
508 (void)fprintf(stderr,
509 "usage: uptime\n");
510 exit (1);
511 }
512