w.c revision 77367 
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 77367 2001-05-28 21:30:31Z phk $";
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/lock.h>
56#include <sys/time.h>
57#include <sys/stat.h>
58#include <sys/sysctl.h>
59#include <sys/proc.h>
60#include <sys/user.h>
61#include <sys/ioctl.h>
62#include <sys/socket.h>
63#include <sys/tty.h>
64
65#include <machine/cpu.h>
66#include <netinet/in.h>
67#include <arpa/inet.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 <limits.h>
76#include <locale.h>
77#include <netdb.h>
78#include <nlist.h>
79#include <paths.h>
80#include <stdio.h>
81#include <stdlib.h>
82#include <string.h>
83#include <unistd.h>
84#include <utmp.h>
85#include <vis.h>
86
87#include <arpa/nameser.h>
88#include <resolv.h>
89
90#include "extern.h"
91
92struct timeval	boottime;
93struct utmp	utmp;
94struct winsize	ws;
95kvm_t	       *kd;
96time_t		now;		/* the current time of day */
97time_t		uptime;		/* time of last reboot & elapsed time since */
98int		ttywidth;	/* width of tty */
99int		argwidth;	/* width of tty */
100int		header = 1;	/* true if -h flag: don't print heading */
101int		nflag;		/* true if -n flag: don't convert addrs */
102int		dflag;		/* true if -d flag: output debug info */
103int		sortidle;	/* sort by idle time */
104int		use_ampm;	/* use AM/PM time */
105int             use_comma;      /* use comma as floats separator */
106char	      **sel_users;	/* login array of particular users selected */
107char		domain[MAXHOSTNAMELEN];
108
109/*
110 * One of these per active utmp entry.
111 */
112struct	entry {
113	struct	entry *next;
114	struct	utmp 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} *ep, *ehead = NULL, **nextp = &ehead;
121
122#define debugproc(p) *((struct kinfo_proc **)&(p)->ki_spare[0])
123
124static void		 pr_header __P((time_t *, int));
125static struct stat	*ttystat __P((char *, int));
126static void		 usage __P((int));
127static int		 this_is_uptime __P((const char *s));
128
129char *fmt_argv __P((char **, char *, int));	/* ../../bin/ps/fmt.c */
130
131int
132main(argc, argv)
133	int argc;
134	char **argv;
135{
136	struct kinfo_proc *kp;
137	struct kinfo_proc *dkp;
138	struct hostent *hp;
139	struct stat *stp;
140	FILE *ut;
141	u_long l;
142	time_t touched;
143	int ch, i, nentries, nusers, wcmd, longidle, dropgid;
144	char *memf, *nlistf, *p, *x;
145	char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
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 = nlistf = _PATH_DEVNULL;
162	while ((ch = getopt(argc, argv, p)) != -1)
163		switch (ch) {
164		case 'd':
165			dflag = 1;
166			break;
167		case 'h':
168			header = 0;
169			break;
170		case 'i':
171			sortidle = 1;
172			break;
173		case 'M':
174			header = 0;
175			memf = optarg;
176			dropgid = 1;
177			break;
178		case 'N':
179			nlistf = optarg;
180			dropgid = 1;
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	/*
201	 * Discard setgid privileges if not the running kernel so that bad
202	 * guys can't print interesting stuff from kernel memory.
203	 */
204	if (dropgid)
205		setgid(getgid());
206
207	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
208		errx(1, "%s", errbuf);
209
210	(void)time(&now);
211	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
212		err(1, "%s", _PATH_UTMP);
213
214	if (*argv)
215		sel_users = argv;
216
217	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
218		if (utmp.ut_name[0] == '\0')
219			continue;
220		if (!(stp = ttystat(utmp.ut_line, UT_LINESIZE)))
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 (!strncmp(utmp.ut_name, *user, UT_NAMESIZE))
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(struct utmp));
241		ep->tdev = stp->st_rdev;
242#ifdef CPU_CONSDEV
243		/*
244		 * If this is the console device, attempt to ascertain
245		 * the true console device dev_t.
246		 */
247		if (ep->tdev == 0) {
248			int mib[2];
249			size_t size;
250
251			mib[0] = CTL_MACHDEP;
252			mib[1] = CPU_CONSDEV;
253			size = sizeof(dev_t);
254			(void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
255		}
256#endif
257		touched = stp->st_atime;
258		if (touched < ep->utmp.ut_time) {
259			/* tty untouched since before login */
260			touched = ep->utmp.ut_time;
261		}
262		if ((ep->idle = now - touched) < 0)
263			ep->idle = 0;
264	}
265	(void)fclose(ut);
266
267	if (header || wcmd == 0) {
268		pr_header(&now, nusers);
269		if (wcmd == 0) {
270			(void)kvm_close(kd);
271			exit(0);
272		}
273
274#define HEADER_USER		"USER"
275#define HEADER_TTY		"TTY"
276#define HEADER_FROM		"FROM"
277#define HEADER_LOGIN_IDLE	"LOGIN@  IDLE "
278#define HEADER_WHAT		"WHAT\n"
279#define WUSED  (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
280		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */
281		(void)printf("%-*.*s %-*.*s %-*.*s  %s",
282				UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
283				UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
284				UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM,
285				HEADER_LOGIN_IDLE HEADER_WHAT);
286	}
287
288	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
289		err(1, "%s", kvm_geterr(kd));
290	for (i = 0; i < nentries; i++, kp++) {
291		if (kp->ki_stat == SIDL || kp->ki_stat == SZOMB)
292			continue;
293		for (ep = ehead; ep != NULL; ep = ep->next) {
294			if (ep->tdev == kp->ki_tdev) {
295				/*
296				 * proc is associated with this terminal
297				 */
298				if (ep->kp == NULL && kp->ki_pgid == kp->ki_tpgid) {
299					/*
300					 * Proc is 'most interesting'
301					 */
302					if (proc_compare(ep->kp, kp))
303						ep->kp = kp;
304				}
305				/*
306				 * Proc debug option info; add to debug
307				 * list using kinfo_proc ki_spare[0]
308				 * as next pointer; ptr to ptr avoids the
309				 * ptr = long assumption.
310				 */
311				dkp = ep->dkp;
312				ep->dkp = kp;
313				debugproc(kp) = dkp;
314			}
315		}
316	}
317	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
318	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
319	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
320	       ttywidth = 79;
321        else
322	       ttywidth = ws.ws_col - 1;
323	argwidth = ttywidth - WUSED;
324	if (argwidth < 4)
325		argwidth = 8;
326	for (ep = ehead; ep != NULL; ep = ep->next) {
327		if (ep->kp == NULL) {
328			ep->args = "-";
329			continue;
330		}
331		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
332		    ep->kp->ki_comm, MAXCOMLEN);
333		if (ep->args == NULL)
334			err(1, NULL);
335	}
336	/* sort by idle time */
337	if (sortidle && ehead != NULL) {
338		struct entry *from, *save;
339
340		from = ehead;
341		ehead = NULL;
342		while (from != NULL) {
343			for (nextp = &ehead;
344			    (*nextp) && from->idle >= (*nextp)->idle;
345			    nextp = &(*nextp)->next)
346				continue;
347			save = from;
348			from = from->next;
349			save->next = *nextp;
350			*nextp = save;
351		}
352	}
353
354	if (!nflag) {
355		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
356		    (p = strchr(domain, '.')) == NULL)
357			domain[0] = '\0';
358		else {
359			domain[sizeof(domain) - 1] = '\0';
360			memmove(domain, p, strlen(p) + 1);
361		}
362	}
363
364	for (ep = ehead; ep != NULL; ep = ep->next) {
365		char host_buf[UT_HOSTSIZE + 1];
366
367		host_buf[UT_HOSTSIZE] = '\0';
368		strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
369		p = *host_buf ? host_buf : "-";
370		if ((x = strchr(p, ':')) != NULL)
371			*x++ = '\0';
372		if (!nflag && isdigit(*p) && (l = inet_addr(p)) != -1 &&
373		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
374			if (domain[0] != '\0') {
375				p = hp->h_name;
376				p += strlen(hp->h_name);
377				p -= strlen(domain);
378				if (p > hp->h_name &&
379				    strcasecmp(p, domain) == 0)
380					*p = '\0';
381			}
382			p = hp->h_name;
383		}
384		if (nflag && *p && strcmp(p, "-") &&
385		    inet_addr(p) == INADDR_NONE) {
386			hp = gethostbyname(p);
387
388			if (hp != NULL) {
389				struct in_addr in;
390
391				memmove(&in, hp->h_addr, sizeof(in));
392				p = inet_ntoa(in);
393			}
394		}
395		if (x) {
396			(void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
397			p = buf;
398		}
399		if (dflag) {
400			for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
401				char *ptr;
402
403				ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
404				    dkp->ki_comm, MAXCOMLEN);
405				if (ptr == NULL)
406					ptr = "-";
407				(void)printf("\t\t%-9d %s\n",
408				    dkp->ki_pid, ptr);
409			}
410		}
411		(void)printf("%-*.*s %-*.*s %-*.*s ",
412		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
413		    UT_LINESIZE, UT_LINESIZE,
414		    strncmp(ep->utmp.ut_line, "tty", 3) &&
415		    strncmp(ep->utmp.ut_line, "cua", 3) ?
416		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
417		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
418		pr_attime(&ep->utmp.ut_time, &now);
419		longidle = pr_idle(ep->idle);
420		(void)printf("%.*s\n", argwidth - longidle, ep->args);
421	}
422	(void)kvm_close(kd);
423	exit(0);
424}
425
426static void
427pr_header(nowp, nusers)
428	time_t *nowp;
429	int nusers;
430{
431	double avenrun[3];
432	time_t uptime;
433	int days, hrs, i, mins, secs;
434	int mib[2];
435	size_t size;
436	char buf[256];
437
438	/*
439	 * Print time of day.
440	 */
441	(void)strftime(buf, sizeof(buf)	- 1,
442		       use_ampm	? "%l:%M%p" : "%k:%M", localtime(nowp));
443	buf[sizeof(buf) - 1] = '\0';
444	(void)printf("%s ", buf);
445
446	/*
447	 * Print how long system has been up.
448	 * (Found by looking getting "boottime" from the kernel)
449	 */
450	mib[0] = CTL_KERN;
451	mib[1] = KERN_BOOTTIME;
452	size = sizeof(boottime);
453	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
454	    boottime.tv_sec != 0) {
455		uptime = now - boottime.tv_sec;
456		uptime += 30;
457		days = uptime / 86400;
458		uptime %= 86400;
459		hrs = uptime / 3600;
460		uptime %= 3600;
461		mins = uptime / 60;
462		secs = uptime % 60;
463		(void)printf(" up");
464		if (days > 0)
465			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
466		if (hrs > 0 && mins > 0)
467			(void)printf(" %2d:%02d,", hrs, mins);
468		else if (hrs > 0)
469			(void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
470		else if (mins > 0)
471			(void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
472		else
473			(void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
474	}
475
476	/* Print number of users logged in to system */
477	(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
478
479	/*
480	 * Print 1, 5, and 15 minute load averages.
481	 */
482	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
483		(void)printf(", no load average information available\n");
484	else {
485		(void)printf(", load averages:");
486		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
487			if (use_comma && i > 0)
488				(void)printf(",");
489			(void)printf(" %.2f", avenrun[i]);
490		}
491		(void)printf("\n");
492	}
493}
494
495static struct stat *
496ttystat(line, sz)
497	char *line;
498	int sz;
499{
500	static struct stat sb;
501	char ttybuf[MAXPATHLEN];
502
503	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
504	if (stat(ttybuf, &sb)) {
505		warn("%s", ttybuf);
506		return (NULL);
507	}
508	return (&sb);
509}
510
511static void
512usage(wcmd)
513	int wcmd;
514{
515	if (wcmd)
516		(void)fprintf(stderr,
517		    "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
518	else
519		(void)fprintf(stderr, "usage: uptime\n");
520	exit(1);
521}
522
523static int
524this_is_uptime(s)
525	const char *s;
526{
527	const char *u;
528
529	if ((u = strrchr(s, '/')) != NULL)
530		++u;
531	else
532		u = s;
533	if (strcmp(u, "uptime") == 0)
534		return (0);
535	return (-1);
536}
537