1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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#include <sys/cdefs.h>
33
34__FBSDID("$FreeBSD$");
35
36#ifndef lint
37static const char copyright[] =
38"@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
39	The Regents of the University of California.  All rights reserved.\n";
40#endif
41
42#ifndef lint
43static const char sccsid[] = "@(#)w.c	8.4 (Berkeley) 4/16/94";
44#endif
45
46/*
47 * w - print system status (who and what)
48 *
49 * This program is similar to the systat command on Tenex/Tops 10/20
50 *
51 */
52#include <sys/param.h>
53#include <sys/time.h>
54#include <sys/stat.h>
55#include <sys/sysctl.h>
56#include <sys/proc.h>
57#include <sys/user.h>
58#include <sys/ioctl.h>
59#include <sys/sbuf.h>
60#include <sys/socket.h>
61#include <sys/tty.h>
62#include <sys/types.h>
63
64#include <machine/cpu.h>
65#include <netinet/in.h>
66#include <arpa/inet.h>
67#include <arpa/nameser.h>
68
69#include <ctype.h>
70#include <err.h>
71#include <errno.h>
72#include <fcntl.h>
73#include <kvm.h>
74#include <langinfo.h>
75#include <libgen.h>
76#include <libutil.h>
77#include <limits.h>
78#include <locale.h>
79#include <netdb.h>
80#include <nlist.h>
81#include <paths.h>
82#include <resolv.h>
83#include <stdio.h>
84#include <stdlib.h>
85#include <string.h>
86#include <timeconv.h>
87#include <unistd.h>
88#include <utmpx.h>
89#include <vis.h>
90#include <libxo/xo.h>
91
92#include "extern.h"
93
94static struct utmpx *utmp;
95static struct winsize ws;
96static kvm_t   *kd;
97static time_t	now;		/* the current time of day */
98static int	ttywidth;	/* width of tty */
99static int	fromwidth = 0;	/* max width of "from" field */
100static int	argwidth;	/* width of arguments */
101static int	header = 1;	/* true if -h flag: don't print heading */
102static int	nflag;		/* true if -n flag: don't convert addrs */
103static int	dflag;		/* true if -d flag: output debug info */
104static int	sortidle;	/* sort by idle time */
105int		use_ampm;	/* use AM/PM time */
106static int	use_comma;      /* use comma as floats separator */
107static char   **sel_users;	/* login array of particular users selected */
108
109/*
110 * One of these per active utmp entry.
111 */
112static struct entry {
113	struct	entry *next;
114	struct	utmpx utmp;
115	dev_t	tdev;			/* dev_t of terminal */
116	time_t	idle;			/* idle time of terminal in seconds */
117	struct	kinfo_proc *kp;		/* `most interesting' proc */
118	char	*args;			/* arg list of interesting process */
119	struct	kinfo_proc *dkp;	/* debug option proc list */
120	char	*from;			/* "from": name or addr */
121	char	*save_from;		/* original "from": name or addr */
122} *ep, *ehead = NULL, **nextp = &ehead;
123
124#define	debugproc(p) *(&((struct kinfo_proc *)p)->ki_udata)
125
126#define	W_DISPUSERSIZE	10
127#define	W_DISPLINESIZE	8
128#define	W_MAXHOSTSIZE	40
129
130static void		 pr_header(time_t *, int);
131static struct stat	*ttystat(char *);
132static void		 usage(int);
133
134char *fmt_argv(char **, char *, char *, size_t);	/* ../../bin/ps/fmt.c */
135
136int
137main(int argc, char *argv[])
138{
139	struct kinfo_proc *kp;
140	struct kinfo_proc *dkp;
141	struct stat *stp;
142	time_t touched;
143	int ch, i, nentries, nusers, wcmd, longidle, longattime;
144	const char *memf, *nlistf, *p, *save_p;
145	char *x_suffix;
146	char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
147	char fn[MAXHOSTNAMELEN];
148	char *dot;
149
150	(void)setlocale(LC_ALL, "");
151	use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
152	use_comma = (*nl_langinfo(RADIXCHAR) != ',');
153
154	argc = xo_parse_args(argc, argv);
155	if (argc < 0)
156		exit(1);
157
158	/* Are we w(1) or uptime(1)? */
159	if (strcmp(basename(argv[0]), "uptime") == 0) {
160		wcmd = 0;
161		p = "";
162	} else {
163		wcmd = 1;
164		p = "dhiflM:N:nsuw";
165	}
166
167	memf = _PATH_DEVNULL;
168	nlistf = NULL;
169	while ((ch = getopt(argc, argv, p)) != -1)
170		switch (ch) {
171		case 'd':
172			dflag = 1;
173			break;
174		case 'h':
175			header = 0;
176			break;
177		case 'i':
178			sortidle = 1;
179			break;
180		case 'M':
181			header = 0;
182			memf = optarg;
183			break;
184		case 'N':
185			nlistf = optarg;
186			break;
187		case 'n':
188			nflag += 1;
189			break;
190		case 'f': case 'l': case 's': case 'u': case 'w':
191			warnx("[-flsuw] no longer supported");
192			/* FALLTHROUGH */
193		case '?':
194		default:
195			usage(wcmd);
196		}
197	argc -= optind;
198	argv += optind;
199
200	if (!(_res.options & RES_INIT))
201		res_init();
202	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
203	_res.retry = 1;		/* only try once.. */
204
205	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
206		errx(1, "%s", errbuf);
207
208	(void)time(&now);
209
210	if (*argv)
211		sel_users = argv;
212
213	setutxent();
214	for (nusers = 0; (utmp = getutxent()) != NULL;) {
215		struct addrinfo hints, *res;
216		struct sockaddr_storage ss;
217		struct sockaddr *sa = (struct sockaddr *)&ss;
218		struct sockaddr_in *lsin = (struct sockaddr_in *)&ss;
219		struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)&ss;
220		int isaddr;
221
222		if (utmp->ut_type != USER_PROCESS)
223			continue;
224		if (!(stp = ttystat(utmp->ut_line)))
225			continue;	/* corrupted record */
226		++nusers;
227		if (wcmd == 0)
228			continue;
229		if (sel_users) {
230			int usermatch;
231			char **user;
232
233			usermatch = 0;
234			for (user = sel_users; !usermatch && *user; user++)
235				if (!strcmp(utmp->ut_user, *user))
236					usermatch = 1;
237			if (!usermatch)
238				continue;
239		}
240		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
241			errx(1, "calloc");
242		*nextp = ep;
243		nextp = &ep->next;
244		memmove(&ep->utmp, utmp, sizeof *utmp);
245		ep->tdev = stp->st_rdev;
246		/*
247		 * If this is the console device, attempt to ascertain
248		 * the true console device dev_t.
249		 */
250		if (ep->tdev == 0) {
251			size_t size;
252
253			size = sizeof(dev_t);
254			(void)sysctlbyname("machdep.consdev", &ep->tdev, &size, NULL, 0);
255		}
256		touched = stp->st_atime;
257		if (touched < ep->utmp.ut_tv.tv_sec) {
258			/* tty untouched since before login */
259			touched = ep->utmp.ut_tv.tv_sec;
260		}
261		if ((ep->idle = now - touched) < 0)
262			ep->idle = 0;
263
264		save_p = p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
265		if ((x_suffix = strrchr(p, ':')) != NULL) {
266			if ((dot = strchr(x_suffix, '.')) != NULL &&
267			    strchr(dot+1, '.') == NULL)
268				*x_suffix++ = '\0';
269			else
270				x_suffix = NULL;
271		}
272
273		isaddr = 0;
274		memset(&ss, '\0', sizeof(ss));
275		if (inet_pton(AF_INET6, p, &lsin6->sin6_addr) == 1) {
276			lsin6->sin6_len = sizeof(*lsin6);
277			lsin6->sin6_family = AF_INET6;
278			isaddr = 1;
279		} else if (inet_pton(AF_INET, p, &lsin->sin_addr) == 1) {
280			lsin->sin_len = sizeof(*lsin);
281			lsin->sin_family = AF_INET;
282			isaddr = 1;
283		}
284		if (nflag == 0) {
285			/* Attempt to change an IP address into a name */
286			if (isaddr && realhostname_sa(fn, sizeof(fn), sa,
287			    sa->sa_len) == HOSTNAME_FOUND)
288				p = fn;
289		} else if (!isaddr && nflag > 1) {
290			/*
291			 * If a host has only one A/AAAA RR, change a
292			 * name into an IP address
293			 */
294			memset(&hints, 0, sizeof(hints));
295			hints.ai_flags = AI_PASSIVE;
296			hints.ai_family = AF_UNSPEC;
297			hints.ai_socktype = SOCK_STREAM;
298			if (getaddrinfo(p, NULL, &hints, &res) == 0) {
299				if (res->ai_next == NULL &&
300				    getnameinfo(res->ai_addr, res->ai_addrlen,
301					fn, sizeof(fn), NULL, 0,
302					NI_NUMERICHOST) == 0)
303					p = fn;
304				freeaddrinfo(res);
305			}
306		}
307
308		if (x_suffix) {
309			(void)snprintf(buf, sizeof(buf), "%s:%s", p, x_suffix);
310			p = buf;
311		}
312		ep->from = strdup(p);
313		if ((i = strlen(p)) > fromwidth)
314			fromwidth = i;
315		if (save_p != p)
316			ep->save_from = strdup(save_p);
317	}
318	endutxent();
319
320#define HEADER_USER		"USER"
321#define HEADER_TTY		"TTY"
322#define HEADER_FROM		"FROM"
323#define HEADER_LOGIN_IDLE	"LOGIN@  IDLE "
324#define HEADER_WHAT		"WHAT\n"
325#define WUSED  (W_DISPUSERSIZE + W_DISPLINESIZE + fromwidth + \
326		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */
327
328
329	if ((int) sizeof(HEADER_FROM) > fromwidth)
330		fromwidth = sizeof(HEADER_FROM);
331	fromwidth++;
332	if (fromwidth > W_MAXHOSTSIZE)
333		fromwidth = W_MAXHOSTSIZE;
334
335	xo_open_container("uptime-information");
336
337	if (header || wcmd == 0) {
338		pr_header(&now, nusers);
339		if (wcmd == 0) {
340			xo_close_container("uptime-information");
341			xo_finish();
342
343			(void)kvm_close(kd);
344			exit(0);
345		}
346
347		xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s}  {T:/%s}",
348				W_DISPUSERSIZE, W_DISPUSERSIZE, HEADER_USER,
349				W_DISPLINESIZE, W_DISPLINESIZE, HEADER_TTY,
350				fromwidth, fromwidth, HEADER_FROM,
351				HEADER_LOGIN_IDLE HEADER_WHAT);
352	}
353
354	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
355		err(1, "%s", kvm_geterr(kd));
356	for (i = 0; i < nentries; i++, kp++) {
357		if (kp->ki_stat == SIDL || kp->ki_stat == SZOMB ||
358		    kp->ki_tdev == NODEV)
359			continue;
360		for (ep = ehead; ep != NULL; ep = ep->next) {
361			if (ep->tdev == kp->ki_tdev) {
362				/*
363				 * proc is associated with this terminal
364				 */
365				if (ep->kp == NULL && kp->ki_pgid == kp->ki_tpgid) {
366					/*
367					 * Proc is 'most interesting'
368					 */
369					if (proc_compare(ep->kp, kp))
370						ep->kp = kp;
371				}
372				/*
373				 * Proc debug option info; add to debug
374				 * list using kinfo_proc ki_spare[0]
375				 * as next pointer; ptr to ptr avoids the
376				 * ptr = long assumption.
377				 */
378				dkp = ep->dkp;
379				ep->dkp = kp;
380				debugproc(kp) = dkp;
381			}
382		}
383	}
384	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
385	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
386	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
387	       ttywidth = 79;
388        else
389	       ttywidth = ws.ws_col - 1;
390	argwidth = ttywidth - WUSED;
391	if (argwidth < 4)
392		argwidth = 8;
393	for (ep = ehead; ep != NULL; ep = ep->next) {
394		if (ep->kp == NULL) {
395			ep->args = strdup("-");
396			continue;
397		}
398		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
399		    ep->kp->ki_comm, NULL, MAXCOMLEN);
400		if (ep->args == NULL)
401			err(1, NULL);
402	}
403	/* sort by idle time */
404	if (sortidle && ehead != NULL) {
405		struct entry *from, *save;
406
407		from = ehead;
408		ehead = NULL;
409		while (from != NULL) {
410			for (nextp = &ehead;
411			    (*nextp) && from->idle >= (*nextp)->idle;
412			    nextp = &(*nextp)->next)
413				continue;
414			save = from;
415			from = from->next;
416			save->next = *nextp;
417			*nextp = save;
418		}
419	}
420
421	xo_open_container("user-table");
422	xo_open_list("user-entry");
423
424	for (ep = ehead; ep != NULL; ep = ep->next) {
425		time_t t;
426
427		xo_open_instance("user-entry");
428
429		if (dflag) {
430		        xo_open_container("process-table");
431		        xo_open_list("process-entry");
432
433			for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
434				const char *ptr;
435
436				ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
437				    dkp->ki_comm, NULL, MAXCOMLEN);
438				if (ptr == NULL)
439					ptr = "-";
440				xo_open_instance("process-entry");
441				xo_emit("\t\t{:process-id/%-9d/%d} {:command/%s}\n",
442				    dkp->ki_pid, ptr);
443				xo_close_instance("process-entry");
444			}
445		        xo_close_list("process-entry");
446		        xo_close_container("process-table");
447		}
448		xo_emit("{:user/%-*.*s/%@**@s} {:tty/%-*.*s/%@**@s} ",
449			W_DISPUSERSIZE, W_DISPUSERSIZE, ep->utmp.ut_user,
450			W_DISPLINESIZE, W_DISPLINESIZE,
451			*ep->utmp.ut_line ?
452			(strncmp(ep->utmp.ut_line, "tty", 3) &&
453			 strncmp(ep->utmp.ut_line, "cua", 3) ?
454			 ep->utmp.ut_line : ep->utmp.ut_line + 3) : "-");
455
456		if (ep->save_from)
457		    xo_attr("address", "%s", ep->save_from);
458		xo_emit("{:from/%-*.*s/%@**@s} ",
459		    fromwidth, fromwidth, ep->from);
460		t = ep->utmp.ut_tv.tv_sec;
461		longattime = pr_attime(&t, &now);
462		longidle = pr_idle(ep->idle);
463		xo_emit("{:command/%.*s/%@*@s}\n",
464		    argwidth - longidle - longattime,
465		    ep->args);
466
467		xo_close_instance("user-entry");
468	}
469
470	xo_close_list("user-entry");
471	xo_close_container("user-table");
472	xo_close_container("uptime-information");
473	xo_finish();
474
475	(void)kvm_close(kd);
476	exit(0);
477}
478
479static void
480pr_header(time_t *nowp, int nusers)
481{
482	double avenrun[3];
483	time_t uptime;
484	struct timespec tp;
485	int days, hrs, i, mins, secs;
486	char buf[256];
487	struct sbuf *upbuf;
488
489	upbuf = sbuf_new_auto();
490	/*
491	 * Print time of day.
492	 */
493	if (strftime(buf, sizeof(buf),
494	    use_ampm ? "%l:%M%p" : "%k:%M", localtime(nowp)) != 0)
495		xo_emit("{:time-of-day/%s} ", buf);
496	/*
497	 * Print how long system has been up.
498	 */
499	if (clock_gettime(CLOCK_UPTIME, &tp) != -1) {
500		uptime = tp.tv_sec;
501		if (uptime > 60)
502			uptime += 30;
503		days = uptime / 86400;
504		uptime %= 86400;
505		hrs = uptime / 3600;
506		uptime %= 3600;
507		mins = uptime / 60;
508		secs = uptime % 60;
509		xo_emit(" up");
510		xo_emit("{e:uptime/%lu}", (unsigned long) tp.tv_sec);
511		xo_emit("{e:days/%d}{e:hours/%d}{e:minutes/%d}{e:seconds/%d}", days, hrs, mins, secs);
512
513		if (days > 0)
514			sbuf_printf(upbuf, " %d day%s,",
515				days, days > 1 ? "s" : "");
516		if (hrs > 0 && mins > 0)
517			sbuf_printf(upbuf, " %2d:%02d,", hrs, mins);
518		else if (hrs > 0)
519			sbuf_printf(upbuf, " %d hr%s,",
520				hrs, hrs > 1 ? "s" : "");
521		else if (mins > 0)
522			sbuf_printf(upbuf, " %d min%s,",
523				mins, mins > 1 ? "s" : "");
524		else
525			sbuf_printf(upbuf, " %d sec%s,",
526				secs, secs > 1 ? "s" : "");
527		if (sbuf_finish(upbuf) != 0)
528			xo_err(1, "Could not generate output");
529		xo_emit("{:uptime-human/%s}", sbuf_data(upbuf));
530		sbuf_delete(upbuf);
531	}
532
533	/* Print number of users logged in to system */
534	xo_emit(" {:users/%d} {Np:user,users}", nusers);
535
536	/*
537	 * Print 1, 5, and 15 minute load averages.
538	 */
539	if (getloadavg(avenrun, nitems(avenrun)) == -1)
540		xo_emit(", no load average information available\n");
541	else {
542	        static const char *format[] = {
543		    " {:load-average-1/%.2f}",
544		    " {:load-average-5/%.2f}",
545		    " {:load-average-15/%.2f}",
546		};
547		xo_emit(", load averages:");
548		for (i = 0; i < (int)(nitems(avenrun)); i++) {
549			if (use_comma && i > 0)
550				xo_emit(",");
551			xo_emit(format[i], avenrun[i]);
552		}
553		xo_emit("\n");
554	}
555}
556
557static struct stat *
558ttystat(char *line)
559{
560	static struct stat sb;
561	char ttybuf[MAXPATHLEN];
562
563	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line);
564	if (stat(ttybuf, &sb) == 0 && S_ISCHR(sb.st_mode)) {
565		return (&sb);
566	} else
567		return (NULL);
568}
569
570static void
571usage(int wcmd)
572{
573	if (wcmd)
574		xo_error("usage: w [-dhin] [-M core] [-N system] [user ...]\n");
575	else
576		xo_error("usage: uptime\n");
577	xo_finish();
578	exit(1);
579}
580