w.c revision 203688 
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. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: head/usr.bin/w/w.c 203688 2010-02-08 21:23:48Z brucec $");
37
38#ifndef lint
39static const char copyright[] =
40"@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
41	The Regents of the University of California.  All rights reserved.\n";
42#endif
43
44#ifndef lint
45static const char sccsid[] = "@(#)w.c	8.4 (Berkeley) 4/16/94";
46#endif
47
48/*
49 * w - print system status (who and what)
50 *
51 * This program is similar to the systat command on Tenex/Tops 10/20
52 *
53 */
54#include <sys/param.h>
55#include <sys/time.h>
56#include <sys/stat.h>
57#include <sys/sysctl.h>
58#include <sys/proc.h>
59#include <sys/user.h>
60#include <sys/ioctl.h>
61#include <sys/socket.h>
62#include <sys/tty.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 <libutil.h>
76#include <limits.h>
77#include <locale.h>
78#include <netdb.h>
79#include <nlist.h>
80#include <paths.h>
81#include <resolv.h>
82#include <stdio.h>
83#include <stdlib.h>
84#include <string.h>
85#include <timeconv.h>
86#include <unistd.h>
87#include <utmpx.h>
88#include <vis.h>
89
90#include "extern.h"
91
92struct timeval	boottime;
93struct utmpx   *utmp;
94struct winsize	ws;
95kvm_t	       *kd;
96time_t		now;		/* the current time of day */
97int		ttywidth;	/* width of tty */
98int		argwidth;	/* width of tty */
99int		header = 1;	/* true if -h flag: don't print heading */
100int		nflag;		/* true if -n flag: don't convert addrs */
101int		dflag;		/* true if -d flag: output debug info */
102int		sortidle;	/* sort by idle time */
103int		use_ampm;	/* use AM/PM time */
104int             use_comma;      /* use comma as floats separator */
105char	      **sel_users;	/* login array of particular users selected */
106
107/*
108 * One of these per active utmp entry.
109 */
110struct	entry {
111	struct	entry *next;
112	struct	utmpx utmp;
113	dev_t	tdev;			/* dev_t of terminal */
114	time_t	idle;			/* idle time of terminal in seconds */
115	struct	kinfo_proc *kp;		/* `most interesting' proc */
116	char	*args;			/* arg list of interesting process */
117	struct	kinfo_proc *dkp;	/* debug option proc list */
118} *ep, *ehead = NULL, **nextp = &ehead;
119
120#define	debugproc(p) *(&((struct kinfo_proc *)p)->ki_udata)
121
122#define	W_DISPUSERSIZE	10
123#define	W_DISPLINESIZE	8
124#define	W_DISPHOSTSIZE	24
125
126static void		 pr_header(time_t *, int);
127static struct stat	*ttystat(char *);
128static void		 usage(int);
129static int		 this_is_uptime(const char *s);
130
131char *fmt_argv(char **, char *, int);	/* ../../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, dropgid;
141	const char *memf, *nlistf, *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	/* Are we w(1) or uptime(1)? */
152	if (this_is_uptime(argv[0]) == 0) {
153		wcmd = 0;
154		p = "";
155	} else {
156		wcmd = 1;
157		p = "dhiflM:N:nsuw";
158	}
159
160	dropgid = 0;
161	memf = _PATH_DEVNULL;
162	nlistf = NULL;
163	while ((ch = getopt(argc, argv, p)) != -1)
164		switch (ch) {
165		case 'd':
166			dflag = 1;
167			break;
168		case 'h':
169			header = 0;
170			break;
171		case 'i':
172			sortidle = 1;
173			break;
174		case 'M':
175			header = 0;
176			memf = optarg;
177			dropgid = 1;
178			break;
179		case 'N':
180			nlistf = optarg;
181			dropgid = 1;
182			break;
183		case 'n':
184			nflag = 1;
185			break;
186		case 'f': case 'l': case 's': case 'u': case 'w':
187			warnx("[-flsuw] no longer supported");
188			/* FALLTHROUGH */
189		case '?':
190		default:
191			usage(wcmd);
192		}
193	argc -= optind;
194	argv += optind;
195
196	if (!(_res.options & RES_INIT))
197		res_init();
198	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
199	_res.retry = 1;		/* only try once.. */
200
201	/*
202	 * Discard setgid privileges if not the running kernel so that bad
203	 * guys can't print interesting stuff from kernel memory.
204	 */
205	if (dropgid)
206		setgid(getgid());
207
208	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
209		errx(1, "%s", errbuf);
210
211	(void)time(&now);
212
213	if (*argv)
214		sel_users = argv;
215
216	setutxent();
217	for (nusers = 0; (utmp = getutxent()) != NULL;) {
218		if (utmp->ut_type != USER_PROCESS)
219			continue;
220		if (!(stp = ttystat(utmp->ut_line)))
221			continue;	/* corrupted record */
222		++nusers;
223		if (wcmd == 0)
224			continue;
225		if (sel_users) {
226			int usermatch;
227			char **user;
228
229			usermatch = 0;
230			for (user = sel_users; !usermatch && *user; user++)
231				if (!strcmp(utmp->ut_user, *user))
232					usermatch = 1;
233			if (!usermatch)
234				continue;
235		}
236		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
237			errx(1, "calloc");
238		*nextp = ep;
239		nextp = &ep->next;
240		memmove(&ep->utmp, utmp, sizeof *utmp);
241		ep->tdev = stp->st_rdev;
242		/*
243		 * If this is the console device, attempt to ascertain
244		 * the true console device dev_t.
245		 */
246		if (ep->tdev == 0) {
247			size_t size;
248
249			size = sizeof(dev_t);
250			(void)sysctlbyname("machdep.consdev", &ep->tdev, &size, NULL, 0);
251		}
252		touched = stp->st_atime;
253		if (touched < ep->utmp.ut_tv.tv_sec) {
254			/* tty untouched since before login */
255			touched = ep->utmp.ut_tv.tv_sec;
256		}
257		if ((ep->idle = now - touched) < 0)
258			ep->idle = 0;
259	}
260	endutxent();
261
262	if (header || wcmd == 0) {
263		pr_header(&now, nusers);
264		if (wcmd == 0) {
265			(void)kvm_close(kd);
266			exit(0);
267		}
268
269#define HEADER_USER		"USER"
270#define HEADER_TTY		"TTY"
271#define HEADER_FROM		"FROM"
272#define HEADER_LOGIN_IDLE	"LOGIN@  IDLE "
273#define HEADER_WHAT		"WHAT\n"
274#define WUSED  (W_DISPUSERSIZE + W_DISPLINESIZE + W_DISPHOSTSIZE + \
275		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */
276		(void)printf("%-*.*s %-*.*s %-*.*s  %s",
277				W_DISPUSERSIZE, W_DISPUSERSIZE, HEADER_USER,
278				W_DISPLINESIZE, W_DISPLINESIZE, HEADER_TTY,
279				W_DISPHOSTSIZE, W_DISPHOSTSIZE, HEADER_FROM,
280				HEADER_LOGIN_IDLE HEADER_WHAT);
281	}
282
283	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
284		err(1, "%s", kvm_geterr(kd));
285	for (i = 0; i < nentries; i++, kp++) {
286		if (kp->ki_stat == SIDL || kp->ki_stat == SZOMB ||
287		    kp->ki_tdev == NODEV)
288			continue;
289		for (ep = ehead; ep != NULL; ep = ep->next) {
290			if (ep->tdev == kp->ki_tdev) {
291				/*
292				 * proc is associated with this terminal
293				 */
294				if (ep->kp == NULL && kp->ki_pgid == kp->ki_tpgid) {
295					/*
296					 * Proc is 'most interesting'
297					 */
298					if (proc_compare(ep->kp, kp))
299						ep->kp = kp;
300				}
301				/*
302				 * Proc debug option info; add to debug
303				 * list using kinfo_proc ki_spare[0]
304				 * as next pointer; ptr to ptr avoids the
305				 * ptr = long assumption.
306				 */
307				dkp = ep->dkp;
308				ep->dkp = kp;
309				debugproc(kp) = dkp;
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 = strdup("-");
325			continue;
326		}
327		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
328		    ep->kp->ki_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	}
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		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
360		if ((x_suffix = strrchr(p, ':')) != NULL) {
361			if ((dot = strchr(x_suffix, '.')) != NULL &&
362			    strchr(dot+1, '.') == NULL)
363				*x_suffix++ = '\0';
364			else
365				x_suffix = NULL;
366		}
367
368		isaddr = 0;
369		memset(&ss, '\0', sizeof(ss));
370		if (inet_pton(AF_INET6, p, &lsin6->sin6_addr) == 1) {
371			lsin6->sin6_len = sizeof(*lsin6);
372			lsin6->sin6_family = AF_INET6;
373			isaddr = 1;
374		} else if (inet_pton(AF_INET, p, &lsin->sin_addr) == 1) {
375			lsin->sin_len = sizeof(*lsin);
376			lsin->sin_family = AF_INET;
377			isaddr = 1;
378		}
379		if (!nflag) {
380			/* Attempt to change an IP address into a name */
381			if (isaddr && realhostname_sa(fn, sizeof(fn), sa,
382			    sa->sa_len) == HOSTNAME_FOUND)
383				p = fn;
384		} else if (!isaddr) {
385			/*
386			 * If a host has only one A/AAAA RR, change a
387			 * name into an IP address
388			 */
389			memset(&hints, 0, sizeof(hints));
390			hints.ai_flags = AI_PASSIVE;
391			hints.ai_family = AF_UNSPEC;
392			hints.ai_socktype = SOCK_STREAM;
393			if (getaddrinfo(p, NULL, &hints, &res) == 0) {
394				if (res->ai_next == NULL &&
395				    getnameinfo(res->ai_addr, res->ai_addrlen,
396					fn, sizeof(fn), NULL, 0,
397					NI_NUMERICHOST) == 0)
398					p = fn;
399				freeaddrinfo(res);
400			}
401		}
402
403		if (x_suffix) {
404			(void)snprintf(buf, sizeof(buf), "%s:%s", p, x_suffix);
405			p = buf;
406		}
407		if (dflag) {
408			for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
409				const char *ptr;
410
411				ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
412				    dkp->ki_comm, MAXCOMLEN);
413				if (ptr == NULL)
414					ptr = "-";
415				(void)printf("\t\t%-9d %s\n",
416				    dkp->ki_pid, ptr);
417			}
418		}
419		(void)printf("%-*.*s %-*.*s %-*.*s ",
420		    W_DISPUSERSIZE, W_DISPUSERSIZE, ep->utmp.ut_user,
421		    W_DISPLINESIZE, W_DISPLINESIZE,
422		    *ep->utmp.ut_line ?
423		    (strncmp(ep->utmp.ut_line, "tty", 3) &&
424		    strncmp(ep->utmp.ut_line, "cua", 3) ?
425		    ep->utmp.ut_line : ep->utmp.ut_line + 3) : "-",
426		    W_DISPHOSTSIZE, W_DISPHOSTSIZE, *p ? p : "-");
427		t = ep->utmp.ut_tv.tv_sec;
428		longattime = pr_attime(&t, &now);
429		longidle = pr_idle(ep->idle);
430		(void)printf("%.*s\n", argwidth - longidle - longattime,
431		    ep->args);
432	}
433	(void)kvm_close(kd);
434	exit(0);
435}
436
437static void
438pr_header(time_t *nowp, int nusers)
439{
440	double avenrun[3];
441	time_t uptime;
442	struct timespec tp;
443	int days, hrs, i, mins, secs;
444	char buf[256];
445
446	/*
447	 * Print time of day.
448	 */
449	if (strftime(buf, sizeof(buf),
450	    use_ampm ? "%l:%M%p" : "%k:%M", localtime(nowp)) != 0)
451		(void)printf("%s ", buf);
452	/*
453	 * Print how long system has been up.
454	 */
455	if (clock_gettime(CLOCK_MONOTONIC, &tp) != -1) {
456		uptime = tp.tv_sec;
457		if (uptime > 60)
458			uptime += 30;
459		days = uptime / 86400;
460		uptime %= 86400;
461		hrs = uptime / 3600;
462		uptime %= 3600;
463		mins = uptime / 60;
464		secs = uptime % 60;
465		(void)printf(" up");
466		if (days > 0)
467			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
468		if (hrs > 0 && mins > 0)
469			(void)printf(" %2d:%02d,", hrs, mins);
470		else if (hrs > 0)
471			(void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
472		else if (mins > 0)
473			(void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
474		else
475			(void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
476	}
477
478	/* Print number of users logged in to system */
479	(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
480
481	/*
482	 * Print 1, 5, and 15 minute load averages.
483	 */
484	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
485		(void)printf(", no load average information available\n");
486	else {
487		(void)printf(", load averages:");
488		for (i = 0; i < (int)(sizeof(avenrun) / sizeof(avenrun[0])); i++) {
489			if (use_comma && i > 0)
490				(void)printf(",");
491			(void)printf(" %.2f", avenrun[i]);
492		}
493		(void)printf("\n");
494	}
495}
496
497static struct stat *
498ttystat(char *line)
499{
500	static struct stat sb;
501	char ttybuf[MAXPATHLEN];
502
503	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%s", _PATH_DEV, line);
504	if (stat(ttybuf, &sb) == 0) {
505		return (&sb);
506	} else
507		return (NULL);
508}
509
510static void
511usage(int wcmd)
512{
513	if (wcmd)
514		(void)fprintf(stderr,
515		    "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
516	else
517		(void)fprintf(stderr, "usage: uptime\n");
518	exit(1);
519}
520
521static int
522this_is_uptime(const char *s)
523{
524	const char *u;
525
526	if ((u = strrchr(s, '/')) != NULL)
527		++u;
528	else
529		u = s;
530	if (strcmp(u, "uptime") == 0)
531		return (0);
532	return (-1);
533}
534