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 * 4. 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
30#include <sys/cdefs.h>
31
32__FBSDID("$FreeBSD: stable/11/usr.bin/w/w.c 321975 2017-08-03 07:17:41Z mav $");
33
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif
39
40#ifndef lint
41static const char sccsid[] = "@(#)w.c	8.4 (Berkeley) 4/16/94";
42#endif
43
44/*
45 * w - print system status (who and what)
46 *
47 * This program is similar to the systat command on Tenex/Tops 10/20
48 *
49 */
50#include <sys/param.h>
51#include <sys/time.h>
52#include <sys/stat.h>
53#include <sys/sysctl.h>
54#include <sys/proc.h>
55#include <sys/user.h>
56#include <sys/ioctl.h>
57#include <sys/sbuf.h>
58#include <sys/socket.h>
59#include <sys/tty.h>
60#include <sys/types.h>
61
62#include <machine/cpu.h>
63#include <netinet/in.h>
64#include <arpa/inet.h>
65#include <arpa/nameser.h>
66
67#include <ctype.h>
68#include <err.h>
69#include <errno.h>
70#include <fcntl.h>
71#include <kvm.h>
72#include <langinfo.h>
73#include <libgen.h>
74#include <libutil.h>
75#include <limits.h>
76#include <locale.h>
77#include <netdb.h>
78#include <nlist.h>
79#include <paths.h>
80#include <resolv.h>
81#include <stdio.h>
82#include <stdlib.h>
83#include <string.h>
84#include <timeconv.h>
85#include <unistd.h>
86#include <utmpx.h>
87#include <vis.h>
88#include <libxo/xo.h>
89
90#include "extern.h"
91
92static struct utmpx *utmp;
93static struct winsize ws;
94static kvm_t   *kd;
95static time_t	now;		/* the current time of day */
96static int	ttywidth;	/* width of tty */
97static int	argwidth;	/* width of tty */
98static int	header = 1;	/* true if -h flag: don't print heading */
99static int	nflag;		/* true if -n flag: don't convert addrs */
100static int	dflag;		/* true if -d flag: output debug info */
101static int	sortidle;	/* sort by idle time */
102int		use_ampm;	/* use AM/PM time */
103static int	use_comma;      /* use comma as floats separator */
104static char   **sel_users;	/* login array of particular users selected */
105
106/*
107 * One of these per active utmp entry.
108 */
109static struct entry {
110	struct	entry *next;
111	struct	utmpx utmp;
112	dev_t	tdev;			/* dev_t of terminal */
113	time_t	idle;			/* idle time of terminal in seconds */
114	struct	kinfo_proc *kp;		/* `most interesting' proc */
115	char	*args;			/* arg list of interesting process */
116	struct	kinfo_proc *dkp;	/* debug option proc list */
117} *ep, *ehead = NULL, **nextp = &ehead;
118
119#define	debugproc(p) *(&((struct kinfo_proc *)p)->ki_udata)
120
121#define	W_DISPUSERSIZE	10
122#define	W_DISPLINESIZE	8
123#define	W_DISPHOSTSIZE	40
124
125static void		 pr_header(time_t *, int);
126static struct stat	*ttystat(char *);
127static void		 usage(int);
128
129char *fmt_argv(char **, char *, char *, size_t);	/* ../../bin/ps/fmt.c */
130
131int
132main(int argc, char *argv[])
133{
134	struct kinfo_proc *kp;
135	struct kinfo_proc *dkp;
136	struct stat *stp;
137	time_t touched;
138	int ch, i, nentries, nusers, wcmd, longidle, longattime;
139	const char *memf, *nlistf, *p, *save_p;
140	char *x_suffix;
141	char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
142	char fn[MAXHOSTNAMELEN];
143	char *dot;
144
145	(void)setlocale(LC_ALL, "");
146	use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
147	use_comma = (*nl_langinfo(RADIXCHAR) != ',');
148
149	argc = xo_parse_args(argc, argv);
150	if (argc < 0)
151		exit(1);
152
153	/* Are we w(1) or uptime(1)? */
154	if (strcmp(basename(argv[0]), "uptime") == 0) {
155		wcmd = 0;
156		p = "";
157	} else {
158		wcmd = 1;
159		p = "dhiflM:N:nsuw";
160	}
161
162	memf = _PATH_DEVNULL;
163	nlistf = NULL;
164	while ((ch = getopt(argc, argv, p)) != -1)
165		switch (ch) {
166		case 'd':
167			dflag = 1;
168			break;
169		case 'h':
170			header = 0;
171			break;
172		case 'i':
173			sortidle = 1;
174			break;
175		case 'M':
176			header = 0;
177			memf = optarg;
178			break;
179		case 'N':
180			nlistf = optarg;
181			break;
182		case 'n':
183			nflag = 1;
184			break;
185		case 'f': case 'l': case 's': case 'u': case 'w':
186			warnx("[-flsuw] no longer supported");
187			/* FALLTHROUGH */
188		case '?':
189		default:
190			usage(wcmd);
191		}
192	argc -= optind;
193	argv += optind;
194
195	if (!(_res.options & RES_INIT))
196		res_init();
197	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
198	_res.retry = 1;		/* only try once.. */
199
200	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
201		errx(1, "%s", errbuf);
202
203	(void)time(&now);
204
205	if (*argv)
206		sel_users = argv;
207
208	setutxent();
209	for (nusers = 0; (utmp = getutxent()) != NULL;) {
210		if (utmp->ut_type != USER_PROCESS)
211			continue;
212		if (!(stp = ttystat(utmp->ut_line)))
213			continue;	/* corrupted record */
214		++nusers;
215		if (wcmd == 0)
216			continue;
217		if (sel_users) {
218			int usermatch;
219			char **user;
220
221			usermatch = 0;
222			for (user = sel_users; !usermatch && *user; user++)
223				if (!strcmp(utmp->ut_user, *user))
224					usermatch = 1;
225			if (!usermatch)
226				continue;
227		}
228		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
229			errx(1, "calloc");
230		*nextp = ep;
231		nextp = &ep->next;
232		memmove(&ep->utmp, utmp, sizeof *utmp);
233		ep->tdev = stp->st_rdev;
234		/*
235		 * If this is the console device, attempt to ascertain
236		 * the true console device dev_t.
237		 */
238		if (ep->tdev == 0) {
239			size_t size;
240
241			size = sizeof(dev_t);
242			(void)sysctlbyname("machdep.consdev", &ep->tdev, &size, NULL, 0);
243		}
244		touched = stp->st_atime;
245		if (touched < ep->utmp.ut_tv.tv_sec) {
246			/* tty untouched since before login */
247			touched = ep->utmp.ut_tv.tv_sec;
248		}
249		if ((ep->idle = now - touched) < 0)
250			ep->idle = 0;
251	}
252	endutxent();
253
254	xo_open_container("uptime-information");
255
256	if (header || wcmd == 0) {
257		pr_header(&now, nusers);
258		if (wcmd == 0) {
259			xo_close_container("uptime-information");
260			xo_finish();
261
262			(void)kvm_close(kd);
263			exit(0);
264		}
265
266#define HEADER_USER		"USER"
267#define HEADER_TTY		"TTY"
268#define HEADER_FROM		"FROM"
269#define HEADER_LOGIN_IDLE	"LOGIN@  IDLE "
270#define HEADER_WHAT		"WHAT\n"
271#define WUSED  (W_DISPUSERSIZE + W_DISPLINESIZE + W_DISPHOSTSIZE + \
272		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */
273		xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s}  {T:/%s}",
274				W_DISPUSERSIZE, W_DISPUSERSIZE, HEADER_USER,
275				W_DISPLINESIZE, W_DISPLINESIZE, HEADER_TTY,
276				W_DISPHOSTSIZE, W_DISPHOSTSIZE, HEADER_FROM,
277				HEADER_LOGIN_IDLE HEADER_WHAT);
278	}
279
280	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
281		err(1, "%s", kvm_geterr(kd));
282	for (i = 0; i < nentries; i++, kp++) {
283		if (kp->ki_stat == SIDL || kp->ki_stat == SZOMB ||
284		    kp->ki_tdev == NODEV)
285			continue;
286		for (ep = ehead; ep != NULL; ep = ep->next) {
287			if (ep->tdev == kp->ki_tdev) {
288				/*
289				 * proc is associated with this terminal
290				 */
291				if (ep->kp == NULL && kp->ki_pgid == kp->ki_tpgid) {
292					/*
293					 * Proc is 'most interesting'
294					 */
295					if (proc_compare(ep->kp, kp))
296						ep->kp = kp;
297				}
298				/*
299				 * Proc debug option info; add to debug
300				 * list using kinfo_proc ki_spare[0]
301				 * as next pointer; ptr to ptr avoids the
302				 * ptr = long assumption.
303				 */
304				dkp = ep->dkp;
305				ep->dkp = kp;
306				debugproc(kp) = dkp;
307			}
308		}
309	}
310	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
311	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
312	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
313	       ttywidth = 79;
314        else
315	       ttywidth = ws.ws_col - 1;
316	argwidth = ttywidth - WUSED;
317	if (argwidth < 4)
318		argwidth = 8;
319	for (ep = ehead; ep != NULL; ep = ep->next) {
320		if (ep->kp == NULL) {
321			ep->args = strdup("-");
322			continue;
323		}
324		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
325		    ep->kp->ki_comm, NULL, MAXCOMLEN);
326		if (ep->args == NULL)
327			err(1, NULL);
328	}
329	/* sort by idle time */
330	if (sortidle && ehead != NULL) {
331		struct entry *from, *save;
332
333		from = ehead;
334		ehead = NULL;
335		while (from != NULL) {
336			for (nextp = &ehead;
337			    (*nextp) && from->idle >= (*nextp)->idle;
338			    nextp = &(*nextp)->next)
339				continue;
340			save = from;
341			from = from->next;
342			save->next = *nextp;
343			*nextp = save;
344		}
345	}
346
347	xo_open_container("user-table");
348	xo_open_list("user-entry");
349
350	for (ep = ehead; ep != NULL; ep = ep->next) {
351		struct addrinfo hints, *res;
352		struct sockaddr_storage ss;
353		struct sockaddr *sa = (struct sockaddr *)&ss;
354		struct sockaddr_in *lsin = (struct sockaddr_in *)&ss;
355		struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)&ss;
356		time_t t;
357		int isaddr;
358
359		xo_open_instance("user-entry");
360
361		save_p = p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
362		if ((x_suffix = strrchr(p, ':')) != NULL) {
363			if ((dot = strchr(x_suffix, '.')) != NULL &&
364			    strchr(dot+1, '.') == NULL)
365				*x_suffix++ = '\0';
366			else
367				x_suffix = NULL;
368		}
369
370		isaddr = 0;
371		memset(&ss, '\0', sizeof(ss));
372		if (inet_pton(AF_INET6, p, &lsin6->sin6_addr) == 1) {
373			lsin6->sin6_len = sizeof(*lsin6);
374			lsin6->sin6_family = AF_INET6;
375			isaddr = 1;
376		} else if (inet_pton(AF_INET, p, &lsin->sin_addr) == 1) {
377			lsin->sin_len = sizeof(*lsin);
378			lsin->sin_family = AF_INET;
379			isaddr = 1;
380		}
381		if (!nflag) {
382			/* Attempt to change an IP address into a name */
383			if (isaddr && realhostname_sa(fn, sizeof(fn), sa,
384			    sa->sa_len) == HOSTNAME_FOUND)
385				p = fn;
386		} else if (!isaddr) {
387			/*
388			 * If a host has only one A/AAAA RR, change a
389			 * name into an IP address
390			 */
391			memset(&hints, 0, sizeof(hints));
392			hints.ai_flags = AI_PASSIVE;
393			hints.ai_family = AF_UNSPEC;
394			hints.ai_socktype = SOCK_STREAM;
395			if (getaddrinfo(p, NULL, &hints, &res) == 0) {
396				if (res->ai_next == NULL &&
397				    getnameinfo(res->ai_addr, res->ai_addrlen,
398					fn, sizeof(fn), NULL, 0,
399					NI_NUMERICHOST) == 0)
400					p = fn;
401				freeaddrinfo(res);
402			}
403		}
404
405		if (x_suffix) {
406			(void)snprintf(buf, sizeof(buf), "%s:%s", p, x_suffix);
407			p = buf;
408		}
409		if (dflag) {
410		        xo_open_container("process-table");
411		        xo_open_list("process-entry");
412
413			for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
414				const char *ptr;
415
416				ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
417				    dkp->ki_comm, NULL, MAXCOMLEN);
418				if (ptr == NULL)
419					ptr = "-";
420				xo_open_instance("process-entry");
421				xo_emit("\t\t{:process-id/%-9d/%d} {:command/%s}\n",
422				    dkp->ki_pid, ptr);
423				xo_close_instance("process-entry");
424			}
425		        xo_close_list("process-entry");
426		        xo_close_container("process-table");
427		}
428		xo_emit("{:user/%-*.*s/%@**@s} {:tty/%-*.*s/%@**@s} ",
429			W_DISPUSERSIZE, W_DISPUSERSIZE, ep->utmp.ut_user,
430			W_DISPLINESIZE, W_DISPLINESIZE,
431			*ep->utmp.ut_line ?
432			(strncmp(ep->utmp.ut_line, "tty", 3) &&
433			 strncmp(ep->utmp.ut_line, "cua", 3) ?
434			 ep->utmp.ut_line : ep->utmp.ut_line + 3) : "-");
435
436		if (save_p && save_p != p)
437		    xo_attr("address", "%s", save_p);
438		xo_emit("{:from/%-*.*s/%@**@s} ",
439		    W_DISPHOSTSIZE, W_DISPHOSTSIZE, *p ? p : "-");
440		t = ep->utmp.ut_tv.tv_sec;
441		longattime = pr_attime(&t, &now);
442		longidle = pr_idle(ep->idle);
443		xo_emit("{:command/%.*s/%@*@s}\n",
444		    argwidth - longidle - longattime,
445		    ep->args);
446
447		xo_close_instance("user-entry");
448	}
449
450	xo_close_list("user-entry");
451	xo_close_container("user-table");
452	xo_close_container("uptime-information");
453	xo_finish();
454
455	(void)kvm_close(kd);
456	exit(0);
457}
458
459static void
460pr_header(time_t *nowp, int nusers)
461{
462	double avenrun[3];
463	time_t uptime;
464	struct timespec tp;
465	int days, hrs, i, mins, secs;
466	char buf[256];
467	struct sbuf *upbuf;
468
469	upbuf = sbuf_new_auto();
470	/*
471	 * Print time of day.
472	 */
473	if (strftime(buf, sizeof(buf),
474	    use_ampm ? "%l:%M%p" : "%k:%M", localtime(nowp)) != 0)
475		xo_emit("{:time-of-day/%s} ", buf);
476	/*
477	 * Print how long system has been up.
478	 */
479	if (clock_gettime(CLOCK_UPTIME, &tp) != -1) {
480		uptime = tp.tv_sec;
481		if (uptime > 60)
482			uptime += 30;
483		days = uptime / 86400;
484		uptime %= 86400;
485		hrs = uptime / 3600;
486		uptime %= 3600;
487		mins = uptime / 60;
488		secs = uptime % 60;
489		xo_emit(" up");
490		xo_emit("{e:uptime/%lu}", (unsigned long) tp.tv_sec);
491		xo_emit("{e:days/%d}{e:hours/%d}{e:minutes/%d}{e:seconds/%d}", days, hrs, mins, secs);
492
493		if (days > 0)
494			sbuf_printf(upbuf, " %d day%s,",
495				days, days > 1 ? "s" : "");
496		if (hrs > 0 && mins > 0)
497			sbuf_printf(upbuf, " %2d:%02d,", hrs, mins);
498		else if (hrs > 0)
499			sbuf_printf(upbuf, " %d hr%s,",
500				hrs, hrs > 1 ? "s" : "");
501		else if (mins > 0)
502			sbuf_printf(upbuf, " %d min%s,",
503				mins, mins > 1 ? "s" : "");
504		else
505			sbuf_printf(upbuf, " %d sec%s,",
506				secs, secs > 1 ? "s" : "");
507		if (sbuf_finish(upbuf) != 0)
508			xo_err(1, "Could not generate output");
509		xo_emit("{:uptime-human/%s}", sbuf_data(upbuf));
510		sbuf_delete(upbuf);
511	}
512
513	/* Print number of users logged in to system */
514	xo_emit(" {:users/%d} {Np:user,users}", nusers);
515
516	/*
517	 * Print 1, 5, and 15 minute load averages.
518	 */
519	if (getloadavg(avenrun, nitems(avenrun)) == -1)
520		xo_emit(", no load average information available\n");
521	else {
522	        static const char *format[] = {
523		    " {:load-average-1/%.2f}",
524		    " {:load-average-5/%.2f}",
525		    " {:load-average-15/%.2f}",
526		};
527		xo_emit(", load averages:");
528		for (i = 0; i < (int)(nitems(avenrun)); i++) {
529			if (use_comma && i > 0)
530				xo_emit(",");
531			xo_emit(format[i], avenrun[i]);
532		}
533		xo_emit("\n");
534	}
535}
536
537static struct stat *
538ttystat(char *line)
539{
540	static struct stat sb;
541	char ttybuf[MAXPATHLEN];
542
543	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line);
544	if (stat(ttybuf, &sb) == 0 && S_ISCHR(sb.st_mode)) {
545		return (&sb);
546	} else
547		return (NULL);
548}
549
550static void
551usage(int wcmd)
552{
553	if (wcmd)
554		xo_error("usage: w [-dhin] [-M core] [-N system] [user ...]\n");
555	else
556		xo_error("usage: uptime\n");
557	xo_finish();
558	exit(1);
559}
560