w.c revision 73368 
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#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 /* not lint */
39
40#ifndef lint
41#if 0
42static char sccsid[] = "@(#)w.c	8.4 (Berkeley) 4/16/94";
43#endif
44static const char rcsid[] =
45  "$FreeBSD: head/usr.bin/w/w.c 73368 2001-03-03 01:32:46Z ache $";
46#endif /* not lint */
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
68#include <ctype.h>
69#include <err.h>
70#include <errno.h>
71#include <fcntl.h>
72#include <kvm.h>
73#include <langinfo.h>
74#include <locale.h>
75#include <netdb.h>
76#include <nlist.h>
77#include <paths.h>
78#include <stdio.h>
79#include <stdlib.h>
80#include <string.h>
81#include <unistd.h>
82#include <utmp.h>
83#include <vis.h>
84
85#include <arpa/nameser.h>
86#include <resolv.h>
87
88#include "extern.h"
89
90struct timeval	boottime;
91struct utmp	utmp;
92struct winsize	ws;
93kvm_t	       *kd;
94time_t		now;		/* the current time of day */
95time_t		uptime;		/* time of last reboot & elapsed time since */
96int		ttywidth;	/* width of tty */
97int		argwidth;	/* width of tty */
98int		header = 1;	/* true if -h flag: don't print heading */
99int		nflag;		/* true if -n flag: don't convert addrs */
100int		dflag;		/* true if -d flag: output debug info */
101int		sortidle;	/* sort by idle time */
102int		use_ampm;	/* use AM/PM time */
103char	      **sel_users;	/* login array of particular users selected */
104char		domain[MAXHOSTNAMELEN];
105
106/*
107 * One of these per active utmp entry.
108 */
109struct	entry {
110	struct	entry *next;
111	struct	utmp 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_spare[0])
120
121static void		 pr_header __P((time_t *, int));
122static struct stat	*ttystat __P((char *, int));
123static void		 usage __P((int));
124static int		 this_is_uptime __P((const char *s));
125
126char *fmt_argv __P((char **, char *, int));	/* ../../bin/ps/fmt.c */
127
128int
129main(argc, argv)
130	int argc;
131	char **argv;
132{
133	struct kinfo_proc *kp;
134	struct kinfo_proc *dkp;
135	struct hostent *hp;
136	struct stat *stp;
137	FILE *ut;
138	u_long l;
139	time_t touched;
140	int ch, i, nentries, nusers, wcmd, longidle, dropgid;
141	char *memf, *nlistf, *p, *x;
142	char buf[MAXHOSTNAMELEN], errbuf[256];
143
144	(void)setlocale(LC_ALL, "");
145	use_ampm = (*nl_langinfo(T_FMT_AMPM) != '\0');
146
147	/* Are we w(1) or uptime(1)? */
148	if (this_is_uptime(argv[0]) == 0) {
149		wcmd = 0;
150		p = "";
151	} else {
152		wcmd = 1;
153		p = "dhiflM:N:nsuw";
154	}
155
156	dropgid = 0;
157	memf = nlistf = _PATH_DEVNULL;
158	while ((ch = getopt(argc, argv, p)) != -1)
159		switch (ch) {
160		case 'd':
161			dflag = 1;
162			break;
163		case 'h':
164			header = 0;
165			break;
166		case 'i':
167			sortidle = 1;
168			break;
169		case 'M':
170			header = 0;
171			memf = optarg;
172			dropgid = 1;
173			break;
174		case 'N':
175			nlistf = optarg;
176			dropgid = 1;
177			break;
178		case 'n':
179			nflag = 1;
180			break;
181		case 'f': case 'l': case 's': case 'u': case 'w':
182			warnx("[-flsuw] no longer supported");
183			/* FALLTHROUGH */
184		case '?':
185		default:
186			usage(wcmd);
187		}
188	argc -= optind;
189	argv += optind;
190
191	if (!(_res.options & RES_INIT))
192		res_init();
193	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
194	_res.retry = 1;		/* only try once.. */
195
196	/*
197	 * Discard setgid privileges if not the running kernel so that bad
198	 * guys can't print interesting stuff from kernel memory.
199	 */
200	if (dropgid)
201		setgid(getgid());
202
203	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
204		errx(1, "%s", errbuf);
205
206	(void)time(&now);
207	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
208		err(1, "%s", _PATH_UTMP);
209
210	if (*argv)
211		sel_users = argv;
212
213	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
214		if (utmp.ut_name[0] == '\0')
215			continue;
216		if (!(stp = ttystat(utmp.ut_line, UT_LINESIZE)))
217			continue;	/* corrupted record */
218		++nusers;
219		if (wcmd == 0)
220			continue;
221		if (sel_users) {
222			int usermatch;
223			char **user;
224
225			usermatch = 0;
226			for (user = sel_users; !usermatch && *user; user++)
227				if (!strncmp(utmp.ut_name, *user, UT_NAMESIZE))
228					usermatch = 1;
229			if (!usermatch)
230				continue;
231		}
232		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
233			errx(1, "calloc");
234		*nextp = ep;
235		nextp = &ep->next;
236		memmove(&ep->utmp, &utmp, sizeof(struct utmp));
237		ep->tdev = stp->st_rdev;
238#ifdef CPU_CONSDEV
239		/*
240		 * If this is the console device, attempt to ascertain
241		 * the true console device dev_t.
242		 */
243		if (ep->tdev == 0) {
244			int mib[2];
245			size_t size;
246
247			mib[0] = CTL_MACHDEP;
248			mib[1] = CPU_CONSDEV;
249			size = sizeof(dev_t);
250			(void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
251		}
252#endif
253		touched = stp->st_atime;
254		if (touched < ep->utmp.ut_time) {
255			/* tty untouched since before login */
256			touched = ep->utmp.ut_time;
257		}
258		if ((ep->idle = now - touched) < 0)
259			ep->idle = 0;
260	}
261	(void)fclose(ut);
262
263	if (header || wcmd == 0) {
264		pr_header(&now, nusers);
265		if (wcmd == 0)
266			exit(0);
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  (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
274		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */
275		(void)printf("%-*.*s %-*.*s %-*.*s  %s",
276				UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
277				UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
278				UT_HOSTSIZE, UT_HOSTSIZE, 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			continue;
287		for (ep = ehead; ep != NULL; ep = ep->next) {
288			if (ep->tdev == kp->ki_tdev) {
289				/*
290				 * proc is associated with this terminal
291				 */
292				if (ep->kp == NULL && kp->ki_pgid == kp->ki_tpgid) {
293					/*
294					 * Proc is 'most interesting'
295					 */
296					if (proc_compare(ep->kp, kp))
297						ep->kp = kp;
298				}
299				/*
300				 * Proc debug option info; add to debug
301				 * list using kinfo_proc ki_spare[0]
302				 * as next pointer; ptr to ptr avoids the
303				 * ptr = long assumption.
304				 */
305				dkp = ep->dkp;
306				ep->dkp = kp;
307				debugproc(kp) = dkp;
308			}
309		}
310	}
311	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
312	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
313	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
314	       ttywidth = 79;
315        else
316	       ttywidth = ws.ws_col - 1;
317	argwidth = ttywidth - WUSED;
318	if (argwidth < 4)
319		argwidth = 8;
320	for (ep = ehead; ep != NULL; ep = ep->next) {
321		if (ep->kp == NULL) {
322			ep->args = "-";
323			continue;
324		}
325		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
326		    ep->kp->ki_comm, MAXCOMLEN);
327		if (ep->args == NULL)
328			err(1, NULL);
329	}
330	/* sort by idle time */
331	if (sortidle && ehead != NULL) {
332		struct entry *from, *save;
333
334		from = ehead;
335		ehead = NULL;
336		while (from != NULL) {
337			for (nextp = &ehead;
338			    (*nextp) && from->idle >= (*nextp)->idle;
339			    nextp = &(*nextp)->next)
340				continue;
341			save = from;
342			from = from->next;
343			save->next = *nextp;
344			*nextp = save;
345		}
346	}
347
348	if (!nflag) {
349		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
350		    (p = strchr(domain, '.')) == NULL)
351			domain[0] = '\0';
352		else {
353			domain[sizeof(domain) - 1] = '\0';
354			memmove(domain, p, strlen(p) + 1);
355		}
356	}
357
358	for (ep = ehead; ep != NULL; ep = ep->next) {
359		char host_buf[UT_HOSTSIZE + 1];
360
361		host_buf[UT_HOSTSIZE] = '\0';
362		strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
363		p = *host_buf ? host_buf : "-";
364		if ((x = strchr(p, ':')) != NULL)
365			*x++ = '\0';
366		if (!nflag && isdigit(*p) && (l = inet_addr(p)) != -1 &&
367		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
368			if (domain[0] != '\0') {
369				p = hp->h_name;
370				p += strlen(hp->h_name);
371				p -= strlen(domain);
372				if (p > hp->h_name &&
373				    strcasecmp(p, domain) == 0)
374					*p = '\0';
375			}
376			p = hp->h_name;
377		}
378		if (nflag && *p && strcmp(p, "-") &&
379		    inet_addr(p) == INADDR_NONE) {
380			hp = gethostbyname(p);
381
382			if (hp != NULL) {
383				struct in_addr in;
384
385				memmove(&in, hp->h_addr, sizeof(in));
386				p = inet_ntoa(in);
387			}
388		}
389		if (x) {
390			(void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
391			p = buf;
392		}
393		if (dflag) {
394			for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
395				char *ptr;
396
397				ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
398				    dkp->ki_comm, MAXCOMLEN);
399				if (ptr == NULL)
400					ptr = "-";
401				(void)printf("\t\t%-9d %s\n",
402				    dkp->ki_pid, ptr);
403			}
404		}
405		(void)printf("%-*.*s %-*.*s %-*.*s ",
406		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
407		    UT_LINESIZE, UT_LINESIZE,
408		    strncmp(ep->utmp.ut_line, "tty", 3) &&
409		    strncmp(ep->utmp.ut_line, "cua", 3) ?
410		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
411		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
412		pr_attime(&ep->utmp.ut_time, &now);
413		longidle = pr_idle(ep->idle);
414		(void)printf("%.*s\n", argwidth - longidle, ep->args);
415	}
416	exit(0);
417}
418
419static void
420pr_header(nowp, nusers)
421	time_t *nowp;
422	int nusers;
423{
424	double avenrun[3];
425	time_t uptime;
426	int days, hrs, i, mins, secs;
427	int mib[2];
428	size_t size;
429	char buf[256];
430
431	/*
432	 * Print time of day.
433	 */
434	(void)strftime(buf, sizeof(buf)	- 1,
435		       use_ampm	? "%l:%M%p" : "%k:%M", localtime(nowp));
436	buf[sizeof(buf) - 1] = '\0';
437	(void)printf("%s ", buf);
438
439	/*
440	 * Print how long system has been up.
441	 * (Found by looking getting "boottime" from the kernel)
442	 */
443	mib[0] = CTL_KERN;
444	mib[1] = KERN_BOOTTIME;
445	size = sizeof(boottime);
446	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
447	    boottime.tv_sec != 0) {
448		uptime = now - boottime.tv_sec;
449		uptime += 30;
450		days = uptime / 86400;
451		uptime %= 86400;
452		hrs = uptime / 3600;
453		uptime %= 3600;
454		mins = uptime / 60;
455		secs = uptime % 60;
456		(void)printf(" up");
457		if (days > 0)
458			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
459		if (hrs > 0 && mins > 0)
460			(void)printf(" %2d:%02d,", hrs, mins);
461		else if (hrs > 0)
462			(void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
463		else if (mins > 0)
464			(void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
465		else
466			(void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
467	}
468
469	/* Print number of users logged in to system */
470	(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
471
472	/*
473	 * Print 1, 5, and 15 minute load averages.
474	 */
475	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
476		(void)printf(", no load average information available\n");
477	else {
478		(void)printf(", load averages:");
479		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++)
480			(void)printf("  %.2f", avenrun[i]);
481		(void)printf("\n");
482	}
483}
484
485static struct stat *
486ttystat(line, sz)
487	char *line;
488	int sz;
489{
490	static struct stat sb;
491	char ttybuf[MAXPATHLEN];
492
493	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
494	if (stat(ttybuf, &sb)) {
495		warn("%s", ttybuf);
496		return (NULL);
497	}
498	return (&sb);
499}
500
501static void
502usage(wcmd)
503	int wcmd;
504{
505	if (wcmd)
506		(void)fprintf(stderr,
507		    "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
508	else
509		(void)fprintf(stderr, "usage: uptime\n");
510	exit(1);
511}
512
513static int
514this_is_uptime(s)
515	const char *s;
516{
517	const char *u;
518
519	if ((u = strrchr(s, '/')) != NULL)
520		++u;
521	else
522		u = s;
523	if (strcmp(u, "uptime") == 0)
524		return (0);
525	return (-1);
526}
527