w.c revision 330897 
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 * 4. 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: stable/11/usr.bin/w/w.c 330897 2018-03-14 03:19:51Z eadler $");
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	argwidth;	/* width of tty */
100static int	header = 1;	/* true if -h flag: don't print heading */
101static int	nflag;		/* true if -n flag: don't convert addrs */
102static int	dflag;		/* true if -d flag: output debug info */
103static int	sortidle;	/* sort by idle time */
104int		use_ampm;	/* use AM/PM time */
105static int	use_comma;      /* use comma as floats separator */
106static char   **sel_users;	/* login array of particular users selected */
107
108/*
109 * One of these per active utmp entry.
110 */
111static struct entry {
112	struct	entry *next;
113	struct	utmpx utmp;
114	dev_t	tdev;			/* dev_t of terminal */
115	time_t	idle;			/* idle time of terminal in seconds */
116	struct	kinfo_proc *kp;		/* `most interesting' proc */
117	char	*args;			/* arg list of interesting process */
118	struct	kinfo_proc *dkp;	/* debug option proc list */
119} *ep, *ehead = NULL, **nextp = &ehead;
120
121#define	debugproc(p) *(&((struct kinfo_proc *)p)->ki_udata)
122
123#define	W_DISPUSERSIZE	10
124#define	W_DISPLINESIZE	8
125#define	W_DISPHOSTSIZE	40
126
127static void		 pr_header(time_t *, int);
128static struct stat	*ttystat(char *);
129static void		 usage(int);
130
131char *fmt_argv(char **, char *, char *, size_t);	/* ../../bin/ps/fmt.c */
132
133int
134main(int argc, char *argv[])
135{
136	struct kinfo_proc *kp;
137	struct kinfo_proc *dkp;
138	struct stat *stp;
139	time_t touched;
140	int ch, i, nentries, nusers, wcmd, longidle, longattime;
141	const char *memf, *nlistf, *p, *save_p;
142	char *x_suffix;
143	char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
144	char fn[MAXHOSTNAMELEN];
145	char *dot;
146
147	(void)setlocale(LC_ALL, "");
148	use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
149	use_comma = (*nl_langinfo(RADIXCHAR) != ',');
150
151	argc = xo_parse_args(argc, argv);
152	if (argc < 0)
153		exit(1);
154
155	/* Are we w(1) or uptime(1)? */
156	if (strcmp(basename(argv[0]), "uptime") == 0) {
157		wcmd = 0;
158		p = "";
159	} else {
160		wcmd = 1;
161		p = "dhiflM:N:nsuw";
162	}
163
164	memf = _PATH_DEVNULL;
165	nlistf = NULL;
166	while ((ch = getopt(argc, argv, p)) != -1)
167		switch (ch) {
168		case 'd':
169			dflag = 1;
170			break;
171		case 'h':
172			header = 0;
173			break;
174		case 'i':
175			sortidle = 1;
176			break;
177		case 'M':
178			header = 0;
179			memf = optarg;
180			break;
181		case 'N':
182			nlistf = optarg;
183			break;
184		case 'n':
185			nflag = 1;
186			break;
187		case 'f': case 'l': case 's': case 'u': case 'w':
188			warnx("[-flsuw] no longer supported");
189			/* FALLTHROUGH */
190		case '?':
191		default:
192			usage(wcmd);
193		}
194	argc -= optind;
195	argv += optind;
196
197	if (!(_res.options & RES_INIT))
198		res_init();
199	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
200	_res.retry = 1;		/* only try once.. */
201
202	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
203		errx(1, "%s", errbuf);
204
205	(void)time(&now);
206
207	if (*argv)
208		sel_users = argv;
209
210	setutxent();
211	for (nusers = 0; (utmp = getutxent()) != NULL;) {
212		if (utmp->ut_type != USER_PROCESS)
213			continue;
214		if (!(stp = ttystat(utmp->ut_line)))
215			continue;	/* corrupted record */
216		++nusers;
217		if (wcmd == 0)
218			continue;
219		if (sel_users) {
220			int usermatch;
221			char **user;
222
223			usermatch = 0;
224			for (user = sel_users; !usermatch && *user; user++)
225				if (!strcmp(utmp->ut_user, *user))
226					usermatch = 1;
227			if (!usermatch)
228				continue;
229		}
230		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
231			errx(1, "calloc");
232		*nextp = ep;
233		nextp = &ep->next;
234		memmove(&ep->utmp, utmp, sizeof *utmp);
235		ep->tdev = stp->st_rdev;
236		/*
237		 * If this is the console device, attempt to ascertain
238		 * the true console device dev_t.
239		 */
240		if (ep->tdev == 0) {
241			size_t size;
242
243			size = sizeof(dev_t);
244			(void)sysctlbyname("machdep.consdev", &ep->tdev, &size, NULL, 0);
245		}
246		touched = stp->st_atime;
247		if (touched < ep->utmp.ut_tv.tv_sec) {
248			/* tty untouched since before login */
249			touched = ep->utmp.ut_tv.tv_sec;
250		}
251		if ((ep->idle = now - touched) < 0)
252			ep->idle = 0;
253	}
254	endutxent();
255
256	xo_open_container("uptime-information");
257
258	if (header || wcmd == 0) {
259		pr_header(&now, nusers);
260		if (wcmd == 0) {
261			xo_close_container("uptime-information");
262			xo_finish();
263
264			(void)kvm_close(kd);
265			exit(0);
266		}
267
268#define HEADER_USER		"USER"
269#define HEADER_TTY		"TTY"
270#define HEADER_FROM		"FROM"
271#define HEADER_LOGIN_IDLE	"LOGIN@  IDLE "
272#define HEADER_WHAT		"WHAT\n"
273#define WUSED  (W_DISPUSERSIZE + W_DISPLINESIZE + W_DISPHOSTSIZE + \
274		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */
275		xo_emit("{T:/%-*.*s} {T:/%-*.*s} {T:/%-*.*s}  {T:/%s}",
276				W_DISPUSERSIZE, W_DISPUSERSIZE, HEADER_USER,
277				W_DISPLINESIZE, W_DISPLINESIZE, HEADER_TTY,
278				W_DISPHOSTSIZE, W_DISPHOSTSIZE, HEADER_FROM,
279				HEADER_LOGIN_IDLE HEADER_WHAT);
280	}
281
282	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
283		err(1, "%s", kvm_geterr(kd));
284	for (i = 0; i < nentries; i++, kp++) {
285		if (kp->ki_stat == SIDL || kp->ki_stat == SZOMB ||
286		    kp->ki_tdev == NODEV)
287			continue;
288		for (ep = ehead; ep != NULL; ep = ep->next) {
289			if (ep->tdev == kp->ki_tdev) {
290				/*
291				 * proc is associated with this terminal
292				 */
293				if (ep->kp == NULL && kp->ki_pgid == kp->ki_tpgid) {
294					/*
295					 * Proc is 'most interesting'
296					 */
297					if (proc_compare(ep->kp, kp))
298						ep->kp = kp;
299				}
300				/*
301				 * Proc debug option info; add to debug
302				 * list using kinfo_proc ki_spare[0]
303				 * as next pointer; ptr to ptr avoids the
304				 * ptr = long assumption.
305				 */
306				dkp = ep->dkp;
307				ep->dkp = kp;
308				debugproc(kp) = dkp;
309			}
310		}
311	}
312	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
313	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
314	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
315	       ttywidth = 79;
316        else
317	       ttywidth = ws.ws_col - 1;
318	argwidth = ttywidth - WUSED;
319	if (argwidth < 4)
320		argwidth = 8;
321	for (ep = ehead; ep != NULL; ep = ep->next) {
322		if (ep->kp == NULL) {
323			ep->args = strdup("-");
324			continue;
325		}
326		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
327		    ep->kp->ki_comm, NULL, MAXCOMLEN);
328		if (ep->args == NULL)
329			err(1, NULL);
330	}
331	/* sort by idle time */
332	if (sortidle && ehead != NULL) {
333		struct entry *from, *save;
334
335		from = ehead;
336		ehead = NULL;
337		while (from != NULL) {
338			for (nextp = &ehead;
339			    (*nextp) && from->idle >= (*nextp)->idle;
340			    nextp = &(*nextp)->next)
341				continue;
342			save = from;
343			from = from->next;
344			save->next = *nextp;
345			*nextp = save;
346		}
347	}
348
349	xo_open_container("user-table");
350	xo_open_list("user-entry");
351
352	for (ep = ehead; ep != NULL; ep = ep->next) {
353		struct addrinfo hints, *res;
354		struct sockaddr_storage ss;
355		struct sockaddr *sa = (struct sockaddr *)&ss;
356		struct sockaddr_in *lsin = (struct sockaddr_in *)&ss;
357		struct sockaddr_in6 *lsin6 = (struct sockaddr_in6 *)&ss;
358		time_t t;
359		int isaddr;
360
361		xo_open_instance("user-entry");
362
363		save_p = p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
364		if ((x_suffix = strrchr(p, ':')) != NULL) {
365			if ((dot = strchr(x_suffix, '.')) != NULL &&
366			    strchr(dot+1, '.') == NULL)
367				*x_suffix++ = '\0';
368			else
369				x_suffix = NULL;
370		}
371
372		isaddr = 0;
373		memset(&ss, '\0', sizeof(ss));
374		if (inet_pton(AF_INET6, p, &lsin6->sin6_addr) == 1) {
375			lsin6->sin6_len = sizeof(*lsin6);
376			lsin6->sin6_family = AF_INET6;
377			isaddr = 1;
378		} else if (inet_pton(AF_INET, p, &lsin->sin_addr) == 1) {
379			lsin->sin_len = sizeof(*lsin);
380			lsin->sin_family = AF_INET;
381			isaddr = 1;
382		}
383		if (!nflag) {
384			/* Attempt to change an IP address into a name */
385			if (isaddr && realhostname_sa(fn, sizeof(fn), sa,
386			    sa->sa_len) == HOSTNAME_FOUND)
387				p = fn;
388		} else if (!isaddr) {
389			/*
390			 * If a host has only one A/AAAA RR, change a
391			 * name into an IP address
392			 */
393			memset(&hints, 0, sizeof(hints));
394			hints.ai_flags = AI_PASSIVE;
395			hints.ai_family = AF_UNSPEC;
396			hints.ai_socktype = SOCK_STREAM;
397			if (getaddrinfo(p, NULL, &hints, &res) == 0) {
398				if (res->ai_next == NULL &&
399				    getnameinfo(res->ai_addr, res->ai_addrlen,
400					fn, sizeof(fn), NULL, 0,
401					NI_NUMERICHOST) == 0)
402					p = fn;
403				freeaddrinfo(res);
404			}
405		}
406
407		if (x_suffix) {
408			(void)snprintf(buf, sizeof(buf), "%s:%s", p, x_suffix);
409			p = buf;
410		}
411		if (dflag) {
412		        xo_open_container("process-table");
413		        xo_open_list("process-entry");
414
415			for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
416				const char *ptr;
417
418				ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
419				    dkp->ki_comm, NULL, MAXCOMLEN);
420				if (ptr == NULL)
421					ptr = "-";
422				xo_open_instance("process-entry");
423				xo_emit("\t\t{:process-id/%-9d/%d} {:command/%s}\n",
424				    dkp->ki_pid, ptr);
425				xo_close_instance("process-entry");
426			}
427		        xo_close_list("process-entry");
428		        xo_close_container("process-table");
429		}
430		xo_emit("{:user/%-*.*s/%@**@s} {:tty/%-*.*s/%@**@s} ",
431			W_DISPUSERSIZE, W_DISPUSERSIZE, ep->utmp.ut_user,
432			W_DISPLINESIZE, W_DISPLINESIZE,
433			*ep->utmp.ut_line ?
434			(strncmp(ep->utmp.ut_line, "tty", 3) &&
435			 strncmp(ep->utmp.ut_line, "cua", 3) ?
436			 ep->utmp.ut_line : ep->utmp.ut_line + 3) : "-");
437
438		if (save_p && save_p != p)
439		    xo_attr("address", "%s", save_p);
440		xo_emit("{:from/%-*.*s/%@**@s} ",
441		    W_DISPHOSTSIZE, W_DISPHOSTSIZE, *p ? p : "-");
442		t = ep->utmp.ut_tv.tv_sec;
443		longattime = pr_attime(&t, &now);
444		longidle = pr_idle(ep->idle);
445		xo_emit("{:command/%.*s/%@*@s}\n",
446		    argwidth - longidle - longattime,
447		    ep->args);
448
449		xo_close_instance("user-entry");
450	}
451
452	xo_close_list("user-entry");
453	xo_close_container("user-table");
454	xo_close_container("uptime-information");
455	xo_finish();
456
457	(void)kvm_close(kd);
458	exit(0);
459}
460
461static void
462pr_header(time_t *nowp, int nusers)
463{
464	double avenrun[3];
465	time_t uptime;
466	struct timespec tp;
467	int days, hrs, i, mins, secs;
468	char buf[256];
469	struct sbuf *upbuf;
470
471	upbuf = sbuf_new_auto();
472	/*
473	 * Print time of day.
474	 */
475	if (strftime(buf, sizeof(buf),
476	    use_ampm ? "%l:%M%p" : "%k:%M", localtime(nowp)) != 0)
477		xo_emit("{:time-of-day/%s} ", buf);
478	/*
479	 * Print how long system has been up.
480	 */
481	if (clock_gettime(CLOCK_UPTIME, &tp) != -1) {
482		uptime = tp.tv_sec;
483		if (uptime > 60)
484			uptime += 30;
485		days = uptime / 86400;
486		uptime %= 86400;
487		hrs = uptime / 3600;
488		uptime %= 3600;
489		mins = uptime / 60;
490		secs = uptime % 60;
491		xo_emit(" up");
492		xo_emit("{e:uptime/%lu}", (unsigned long) tp.tv_sec);
493		xo_emit("{e:days/%d}{e:hours/%d}{e:minutes/%d}{e:seconds/%d}", days, hrs, mins, secs);
494
495		if (days > 0)
496			sbuf_printf(upbuf, " %d day%s,",
497				days, days > 1 ? "s" : "");
498		if (hrs > 0 && mins > 0)
499			sbuf_printf(upbuf, " %2d:%02d,", hrs, mins);
500		else if (hrs > 0)
501			sbuf_printf(upbuf, " %d hr%s,",
502				hrs, hrs > 1 ? "s" : "");
503		else if (mins > 0)
504			sbuf_printf(upbuf, " %d min%s,",
505				mins, mins > 1 ? "s" : "");
506		else
507			sbuf_printf(upbuf, " %d sec%s,",
508				secs, secs > 1 ? "s" : "");
509		if (sbuf_finish(upbuf) != 0)
510			xo_err(1, "Could not generate output");
511		xo_emit("{:uptime-human/%s}", sbuf_data(upbuf));
512		sbuf_delete(upbuf);
513	}
514
515	/* Print number of users logged in to system */
516	xo_emit(" {:users/%d} {Np:user,users}", nusers);
517
518	/*
519	 * Print 1, 5, and 15 minute load averages.
520	 */
521	if (getloadavg(avenrun, nitems(avenrun)) == -1)
522		xo_emit(", no load average information available\n");
523	else {
524	        static const char *format[] = {
525		    " {:load-average-1/%.2f}",
526		    " {:load-average-5/%.2f}",
527		    " {:load-average-15/%.2f}",
528		};
529		xo_emit(", load averages:");
530		for (i = 0; i < (int)(nitems(avenrun)); i++) {
531			if (use_comma && i > 0)
532				xo_emit(",");
533			xo_emit(format[i], avenrun[i]);
534		}
535		xo_emit("\n");
536	}
537}
538
539static struct stat *
540ttystat(char *line)
541{
542	static struct stat sb;
543	char ttybuf[MAXPATHLEN];
544
545	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line);
546	if (stat(ttybuf, &sb) == 0 && S_ISCHR(sb.st_mode)) {
547		return (&sb);
548	} else
549		return (NULL);
550}
551
552static void
553usage(int wcmd)
554{
555	if (wcmd)
556		xo_error("usage: w [-dhin] [-M core] [-N system] [user ...]\n");
557	else
558		xo_error("usage: uptime\n");
559	xo_finish();
560	exit(1);
561}
562