w.c revision 70272 
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 70272 2000-12-22 15:21:06Z brian $";
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 <netdb.h>
74#include <nlist.h>
75#include <paths.h>
76#include <stdio.h>
77#include <stdlib.h>
78#include <string.h>
79#include <unistd.h>
80#include <utmp.h>
81#include <vis.h>
82#include <locale.h>
83
84#include <arpa/nameser.h>
85#include <resolv.h>
86
87#include "extern.h"
88
89struct timeval	boottime;
90struct utmp	utmp;
91struct winsize	ws;
92kvm_t	       *kd;
93time_t		now;		/* the current time of day */
94time_t		uptime;		/* time of last reboot & elapsed time since */
95int		ttywidth;	/* width of tty */
96int		argwidth;	/* width of tty */
97int		header = 1;	/* true if -h flag: don't print heading */
98int		nflag;		/* true if -n flag: don't convert addrs */
99int		dflag;		/* true if -d flag: output debug info */
100int		sortidle;	/* sort by idle time */
101char	      **sel_users;	/* login array of particular users selected */
102char		domain[MAXHOSTNAMELEN];
103
104/*
105 * One of these per active utmp entry.
106 */
107struct	entry {
108	struct	entry *next;
109	struct	utmp utmp;
110	dev_t	tdev;			/* dev_t of terminal */
111	time_t	idle;			/* idle time of terminal in seconds */
112	struct	kinfo_proc *kp;		/* `most interesting' proc */
113	char	*args;			/* arg list of interesting process */
114	struct	kinfo_proc *dkp;	/* debug option proc list */
115} *ep, *ehead = NULL, **nextp = &ehead;
116
117#define debugproc(p) *((struct kinfo_proc **)&(p)->ki_spare[0])
118
119static void		 pr_header __P((time_t *, int));
120static struct stat	*ttystat __P((char *, int));
121static void		 usage __P((int));
122static int		 this_is_uptime __P((const char *s));
123
124char *fmt_argv __P((char **, char *, int));	/* ../../bin/ps/fmt.c */
125
126int
127main(argc, argv)
128	int argc;
129	char **argv;
130{
131	struct kinfo_proc *kp;
132	struct kinfo_proc *dkp;
133	struct hostent *hp;
134	struct stat *stp;
135	FILE *ut;
136	u_long l;
137	time_t touched;
138	int ch, i, nentries, nusers, wcmd, longidle, dropgid;
139	char *memf, *nlistf, *p, *x;
140	char buf[MAXHOSTNAMELEN], errbuf[256];
141
142	(void)setlocale(LC_ALL, "");
143
144	/* Are we w(1) or uptime(1)? */
145	if (this_is_uptime(argv[0]) == 0) {
146		wcmd = 0;
147		p = "";
148	} else {
149		wcmd = 1;
150		p = "dhiflM:N:nsuw";
151	}
152
153	dropgid = 0;
154	memf = nlistf = _PATH_DEVNULL;
155	while ((ch = getopt(argc, argv, p)) != -1)
156		switch (ch) {
157		case 'd':
158			dflag = 1;
159			break;
160		case 'h':
161			header = 0;
162			break;
163		case 'i':
164			sortidle = 1;
165			break;
166		case 'M':
167			header = 0;
168			memf = optarg;
169			dropgid = 1;
170			break;
171		case 'N':
172			nlistf = optarg;
173			dropgid = 1;
174			break;
175		case 'n':
176			nflag = 1;
177			break;
178		case 'f': case 'l': case 's': case 'u': case 'w':
179			warnx("[-flsuw] no longer supported");
180			/* FALLTHROUGH */
181		case '?':
182		default:
183			usage(wcmd);
184		}
185	argc -= optind;
186	argv += optind;
187
188	if (!(_res.options & RES_INIT))
189		res_init();
190	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
191	_res.retry = 1;		/* only try once.. */
192
193	/*
194	 * Discard setgid privileges if not the running kernel so that bad
195	 * guys can't print interesting stuff from kernel memory.
196	 */
197	if (dropgid)
198		setgid(getgid());
199
200	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
201		errx(1, "%s", errbuf);
202
203	(void)time(&now);
204	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
205		err(1, "%s", _PATH_UTMP);
206
207	if (*argv)
208		sel_users = argv;
209
210	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
211		if (utmp.ut_name[0] == '\0')
212			continue;
213		if (!(stp = ttystat(utmp.ut_line, UT_LINESIZE)))
214			continue;	/* corrupted record */
215		++nusers;
216		if (wcmd == 0)
217			continue;
218		if (sel_users) {
219			int usermatch;
220			char **user;
221
222			usermatch = 0;
223			for (user = sel_users; !usermatch && *user; user++)
224				if (!strncmp(utmp.ut_name, *user, UT_NAMESIZE))
225					usermatch = 1;
226			if (!usermatch)
227				continue;
228		}
229		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
230			errx(1, "calloc");
231		*nextp = ep;
232		nextp = &ep->next;
233		memmove(&ep->utmp, &utmp, sizeof(struct utmp));
234		ep->tdev = stp->st_rdev;
235#ifdef CPU_CONSDEV
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			int mib[2];
242			size_t size;
243
244			mib[0] = CTL_MACHDEP;
245			mib[1] = CPU_CONSDEV;
246			size = sizeof(dev_t);
247			(void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
248		}
249#endif
250		touched = stp->st_atime;
251		if (touched < ep->utmp.ut_time) {
252			/* tty untouched since before login */
253			touched = ep->utmp.ut_time;
254		}
255		if ((ep->idle = now - touched) < 0)
256			ep->idle = 0;
257	}
258	(void)fclose(ut);
259
260	if (header || wcmd == 0) {
261		pr_header(&now, nusers);
262		if (wcmd == 0)
263			exit(0);
264
265#define HEADER_USER		"USER"
266#define HEADER_TTY		"TTY"
267#define HEADER_FROM		"FROM"
268#define HEADER_LOGIN_IDLE	"LOGIN@  IDLE "
269#define HEADER_WHAT		"WHAT\n"
270#define WUSED  (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
271		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */
272		(void)printf("%-*.*s %-*.*s %-*.*s  %s",
273				UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
274				UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
275				UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM,
276				HEADER_LOGIN_IDLE HEADER_WHAT);
277	}
278
279	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
280		err(1, "%s", kvm_geterr(kd));
281	for (i = 0; i < nentries; i++, kp++) {
282		if (kp->ki_stat == SIDL || kp->ki_stat == SZOMB)
283			continue;
284		for (ep = ehead; ep != NULL; ep = ep->next) {
285			if (ep->tdev == kp->ki_tdev) {
286				/*
287				 * proc is associated with this terminal
288				 */
289				if (ep->kp == NULL && kp->ki_pgid == kp->ki_tpgid) {
290					/*
291					 * Proc is 'most interesting'
292					 */
293					if (proc_compare(ep->kp, kp))
294						ep->kp = kp;
295				}
296				/*
297				 * Proc debug option info; add to debug
298				 * list using kinfo_proc ki_spare[0]
299				 * as next pointer; ptr to ptr avoids the
300				 * ptr = long assumption.
301				 */
302				dkp = ep->dkp;
303				ep->dkp = kp;
304				debugproc(kp) = dkp;
305			}
306		}
307	}
308	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
309	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
310	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
311	       ttywidth = 79;
312        else
313	       ttywidth = ws.ws_col - 1;
314	argwidth = ttywidth - WUSED;
315	if (argwidth < 4)
316		argwidth = 8;
317	for (ep = ehead; ep != NULL; ep = ep->next) {
318		if (ep->kp == NULL) {
319			ep->args = "-";
320			continue;
321		}
322		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
323		    ep->kp->ki_comm, MAXCOMLEN);
324		if (ep->args == NULL)
325			err(1, NULL);
326	}
327	/* sort by idle time */
328	if (sortidle && ehead != NULL) {
329		struct entry *from, *save;
330
331		from = ehead;
332		ehead = NULL;
333		while (from != NULL) {
334			for (nextp = &ehead;
335			    (*nextp) && from->idle >= (*nextp)->idle;
336			    nextp = &(*nextp)->next)
337				continue;
338			save = from;
339			from = from->next;
340			save->next = *nextp;
341			*nextp = save;
342		}
343	}
344
345	if (!nflag) {
346		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
347		    (p = strchr(domain, '.')) == NULL)
348			domain[0] = '\0';
349		else {
350			domain[sizeof(domain) - 1] = '\0';
351			memmove(domain, p, strlen(p) + 1);
352		}
353	}
354
355	for (ep = ehead; ep != NULL; ep = ep->next) {
356		char host_buf[UT_HOSTSIZE + 1];
357
358		host_buf[UT_HOSTSIZE] = '\0';
359		strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
360		p = *host_buf ? host_buf : "-";
361		if ((x = strchr(p, ':')) != NULL)
362			*x++ = '\0';
363		if (!nflag && isdigit(*p) && (l = inet_addr(p)) != -1 &&
364		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
365			if (domain[0] != '\0') {
366				p = hp->h_name;
367				p += strlen(hp->h_name);
368				p -= strlen(domain);
369				if (p > hp->h_name &&
370				    strcasecmp(p, domain) == 0)
371					*p = '\0';
372			}
373			p = hp->h_name;
374		}
375		if (nflag && *p && strcmp(p, "-") &&
376		    inet_addr(p) == INADDR_NONE) {
377			hp = gethostbyname(p);
378
379			if (hp != NULL) {
380				struct in_addr in;
381
382				memmove(&in, hp->h_addr, sizeof(in));
383				p = inet_ntoa(in);
384			}
385		}
386		if (x) {
387			(void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
388			p = buf;
389		}
390		if (dflag) {
391			for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
392				char *ptr;
393
394				ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
395				    dkp->ki_comm, MAXCOMLEN);
396				if (ptr == NULL)
397					ptr = "-";
398				(void)printf("\t\t%-9d %s\n",
399				    dkp->ki_pid, ptr);
400			}
401		}
402		(void)printf("%-*.*s %-*.*s %-*.*s ",
403		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
404		    UT_LINESIZE, UT_LINESIZE,
405		    strncmp(ep->utmp.ut_line, "tty", 3) &&
406		    strncmp(ep->utmp.ut_line, "cua", 3) ?
407		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
408		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
409		pr_attime(&ep->utmp.ut_time, &now);
410		longidle = pr_idle(ep->idle);
411		(void)printf("%.*s\n", argwidth - longidle, ep->args);
412	}
413	exit(0);
414}
415
416static void
417pr_header(nowp, nusers)
418	time_t *nowp;
419	int nusers;
420{
421	double avenrun[3];
422	time_t uptime;
423	int days, hrs, i, mins, secs;
424	int mib[2];
425	size_t size;
426	char buf[256];
427
428	/*
429	 * Print time of day.
430	 */
431	(void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp));
432	buf[sizeof(buf) - 1] = '\0';
433	(void)printf("%s ", buf);
434
435	/*
436	 * Print how long system has been up.
437	 * (Found by looking getting "boottime" from the kernel)
438	 */
439	mib[0] = CTL_KERN;
440	mib[1] = KERN_BOOTTIME;
441	size = sizeof(boottime);
442	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
443	    boottime.tv_sec != 0) {
444		uptime = now - boottime.tv_sec;
445		uptime += 30;
446		days = uptime / 86400;
447		uptime %= 86400;
448		hrs = uptime / 3600;
449		uptime %= 3600;
450		mins = uptime / 60;
451		secs = uptime % 60;
452		(void)printf(" up");
453		if (days > 0)
454			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
455		if (hrs > 0 && mins > 0)
456			(void)printf(" %2d:%02d,", hrs, mins);
457		else if (hrs > 0)
458			(void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
459		else if (mins > 0)
460			(void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
461		else
462			(void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
463	}
464
465	/* Print number of users logged in to system */
466	(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
467
468	/*
469	 * Print 1, 5, and 15 minute load averages.
470	 */
471	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
472		(void)printf(", no load average information available\n");
473	else {
474		(void)printf(", load averages:");
475		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++)
476			(void)printf("%s %.2f", i > 0 ? "," : "", avenrun[i]);
477		(void)printf("\n");
478	}
479}
480
481static struct stat *
482ttystat(line, sz)
483	char *line;
484	int sz;
485{
486	static struct stat sb;
487	char ttybuf[MAXPATHLEN];
488
489	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
490	if (stat(ttybuf, &sb)) {
491		warn("%s", ttybuf);
492		return (NULL);
493	}
494	return (&sb);
495}
496
497static void
498usage(wcmd)
499	int wcmd;
500{
501	if (wcmd)
502		(void)fprintf(stderr,
503		    "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
504	else
505		(void)fprintf(stderr, "usage: uptime\n");
506	exit(1);
507}
508
509static int
510this_is_uptime(s)
511	const char *s;
512{
513	const char *u;
514
515	if ((u = strrchr(s, '/')) != NULL)
516		++u;
517	else
518		u = s;
519	if (strcmp(u, "uptime") == 0)
520		return (0);
521	return (-1);
522}
523