w.c revision 69896 
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 69896 2000-12-12 07:25:57Z mckusick $";
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	int ch, i, nentries, nusers, wcmd, longidle, dropgid;
138	char *memf, *nlistf, *p, *x;
139	char buf[MAXHOSTNAMELEN], errbuf[256];
140
141	(void)setlocale(LC_ALL, "");
142
143	/* Are we w(1) or uptime(1)? */
144	if (this_is_uptime(argv[0]) == 0) {
145		wcmd = 0;
146		p = "";
147	} else {
148		wcmd = 1;
149		p = "dhiflM:N:nsuw";
150	}
151
152	dropgid = 0;
153	memf = nlistf = _PATH_DEVNULL;
154	while ((ch = getopt(argc, argv, p)) != -1)
155		switch (ch) {
156		case 'd':
157			dflag = 1;
158			break;
159		case 'h':
160			header = 0;
161			break;
162		case 'i':
163			sortidle = 1;
164			break;
165		case 'M':
166			header = 0;
167			memf = optarg;
168			dropgid = 1;
169			break;
170		case 'N':
171			nlistf = optarg;
172			dropgid = 1;
173			break;
174		case 'n':
175			nflag = 1;
176			break;
177		case 'f': case 'l': case 's': case 'u': case 'w':
178			warnx("[-flsuw] no longer supported");
179			/* FALLTHROUGH */
180		case '?':
181		default:
182			usage(wcmd);
183		}
184	argc -= optind;
185	argv += optind;
186
187	if (!(_res.options & RES_INIT))
188		res_init();
189	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
190	_res.retry = 1;		/* only try once.. */
191
192	/*
193	 * Discard setgid privileges if not the running kernel so that bad
194	 * guys can't print interesting stuff from kernel memory.
195	 */
196	if (dropgid)
197		setgid(getgid());
198
199	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
200		errx(1, "%s", errbuf);
201
202	(void)time(&now);
203	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
204		err(1, "%s", _PATH_UTMP);
205
206	if (*argv)
207		sel_users = argv;
208
209	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
210		if (utmp.ut_name[0] == '\0')
211			continue;
212		if (!(stp = ttystat(utmp.ut_line, UT_LINESIZE)))
213			continue;	/* corrupted record */
214		++nusers;
215		if (wcmd == 0)
216			continue;
217		if (sel_users) {
218			int usermatch;
219			char **user;
220
221			usermatch = 0;
222			for (user = sel_users; !usermatch && *user; user++)
223				if (!strncmp(utmp.ut_name, *user, UT_NAMESIZE))
224					usermatch = 1;
225			if (!usermatch)
226				continue;
227		}
228		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
229			errx(1, "calloc");
230		*nextp = ep;
231		nextp = &ep->next;
232		memmove(&ep->utmp, &utmp, sizeof(struct utmp));
233		ep->tdev = stp->st_rdev;
234#ifdef CPU_CONSDEV
235		/*
236		 * If this is the console device, attempt to ascertain
237		 * the true console device dev_t.
238		 */
239		if (ep->tdev == 0) {
240			int mib[2];
241			size_t size;
242
243			mib[0] = CTL_MACHDEP;
244			mib[1] = CPU_CONSDEV;
245			size = sizeof(dev_t);
246			(void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
247		}
248#endif
249		if ((ep->idle = now - stp->st_atime) < 0)
250			ep->idle = 0;
251	}
252	(void)fclose(ut);
253
254	if (header || wcmd == 0) {
255		pr_header(&now, nusers);
256		if (wcmd == 0)
257			exit(0);
258
259#define HEADER_USER		"USER"
260#define HEADER_TTY		"TTY"
261#define HEADER_FROM		"FROM"
262#define HEADER_LOGIN_IDLE	"LOGIN@  IDLE "
263#define HEADER_WHAT		"WHAT\n"
264#define WUSED  (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
265		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */
266		(void)printf("%-*.*s %-*.*s %-*.*s  %s",
267				UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
268				UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
269				UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM,
270				HEADER_LOGIN_IDLE HEADER_WHAT);
271	}
272
273	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
274		err(1, "%s", kvm_geterr(kd));
275	for (i = 0; i < nentries; i++, kp++) {
276		if (kp->ki_stat == SIDL || kp->ki_stat == SZOMB)
277			continue;
278		for (ep = ehead; ep != NULL; ep = ep->next) {
279			if (ep->tdev == kp->ki_tdev) {
280				/*
281				 * proc is associated with this terminal
282				 */
283				if (ep->kp == NULL && kp->ki_pgid == kp->ki_tpgid) {
284					/*
285					 * Proc is 'most interesting'
286					 */
287					if (proc_compare(ep->kp, kp))
288						ep->kp = kp;
289				}
290				/*
291				 * Proc debug option info; add to debug
292				 * list using kinfo_proc ki_spare[0]
293				 * as next pointer; ptr to ptr avoids the
294				 * ptr = long assumption.
295				 */
296				dkp = ep->dkp;
297				ep->dkp = kp;
298				debugproc(kp) = dkp;
299			}
300		}
301	}
302	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
303	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
304	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
305	       ttywidth = 79;
306        else
307	       ttywidth = ws.ws_col - 1;
308	argwidth = ttywidth - WUSED;
309	if (argwidth < 4)
310		argwidth = 8;
311	for (ep = ehead; ep != NULL; ep = ep->next) {
312		if (ep->kp == NULL) {
313			ep->args = "-";
314			continue;
315		}
316		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
317		    ep->kp->ki_comm, MAXCOMLEN);
318		if (ep->args == NULL)
319			err(1, NULL);
320	}
321	/* sort by idle time */
322	if (sortidle && ehead != NULL) {
323		struct entry *from, *save;
324
325		from = ehead;
326		ehead = NULL;
327		while (from != NULL) {
328			for (nextp = &ehead;
329			    (*nextp) && from->idle >= (*nextp)->idle;
330			    nextp = &(*nextp)->next)
331				continue;
332			save = from;
333			from = from->next;
334			save->next = *nextp;
335			*nextp = save;
336		}
337	}
338
339	if (!nflag) {
340		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
341		    (p = strchr(domain, '.')) == NULL)
342			domain[0] = '\0';
343		else {
344			domain[sizeof(domain) - 1] = '\0';
345			memmove(domain, p, strlen(p) + 1);
346		}
347	}
348
349	for (ep = ehead; ep != NULL; ep = ep->next) {
350		char host_buf[UT_HOSTSIZE + 1];
351
352		host_buf[UT_HOSTSIZE] = '\0';
353		strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
354		p = *host_buf ? host_buf : "-";
355		if ((x = strchr(p, ':')) != NULL)
356			*x++ = '\0';
357		if (!nflag && isdigit(*p) && (l = inet_addr(p)) != -1 &&
358		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
359			if (domain[0] != '\0') {
360				p = hp->h_name;
361				p += strlen(hp->h_name);
362				p -= strlen(domain);
363				if (p > hp->h_name && strcmp(p, domain) == 0)
364					*p = '\0';
365			}
366			p = hp->h_name;
367		}
368		if (nflag && *p && strcmp(p, "-") &&
369		    inet_addr(p) == INADDR_NONE) {
370			hp = gethostbyname(p);
371
372			if (hp != NULL) {
373				struct in_addr in;
374
375				memmove(&in, hp->h_addr, sizeof(in));
376				p = inet_ntoa(in);
377			}
378		}
379		if (x) {
380			(void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
381			p = buf;
382		}
383		if (dflag) {
384			for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
385				char *ptr;
386
387				ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
388				    dkp->ki_comm, MAXCOMLEN);
389				if (ptr == NULL)
390					ptr = "-";
391				(void)printf("\t\t%-9d %s\n",
392				    dkp->ki_pid, ptr);
393			}
394		}
395		(void)printf("%-*.*s %-*.*s %-*.*s ",
396		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
397		    UT_LINESIZE, UT_LINESIZE,
398		    strncmp(ep->utmp.ut_line, "tty", 3) &&
399		    strncmp(ep->utmp.ut_line, "cua", 3) ?
400		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
401		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
402		pr_attime(&ep->utmp.ut_time, &now);
403		longidle = pr_idle(ep->idle);
404		(void)printf("%.*s\n", argwidth - longidle, ep->args);
405	}
406	exit(0);
407}
408
409static void
410pr_header(nowp, nusers)
411	time_t *nowp;
412	int nusers;
413{
414	double avenrun[3];
415	time_t uptime;
416	int days, hrs, i, mins, secs;
417	int mib[2];
418	size_t size;
419	char buf[256];
420
421	/*
422	 * Print time of day.
423	 */
424	(void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp));
425	buf[sizeof(buf) - 1] = '\0';
426	(void)printf("%s ", buf);
427
428	/*
429	 * Print how long system has been up.
430	 * (Found by looking getting "boottime" from the kernel)
431	 */
432	mib[0] = CTL_KERN;
433	mib[1] = KERN_BOOTTIME;
434	size = sizeof(boottime);
435	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
436	    boottime.tv_sec != 0) {
437		uptime = now - boottime.tv_sec;
438		uptime += 30;
439		days = uptime / 86400;
440		uptime %= 86400;
441		hrs = uptime / 3600;
442		uptime %= 3600;
443		mins = uptime / 60;
444		secs = uptime % 60;
445		(void)printf(" up");
446		if (days > 0)
447			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
448		if (hrs > 0 && mins > 0)
449			(void)printf(" %2d:%02d,", hrs, mins);
450		else if (hrs > 0)
451			(void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
452		else if (mins > 0)
453			(void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
454		else
455			(void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
456	}
457
458	/* Print number of users logged in to system */
459	(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
460
461	/*
462	 * Print 1, 5, and 15 minute load averages.
463	 */
464	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
465		(void)printf(", no load average information available\n");
466	else {
467		(void)printf(", load averages:");
468		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++)
469			(void)printf("%s %.2f", i > 0 ? "," : "", avenrun[i]);
470		(void)printf("\n");
471	}
472}
473
474static struct stat *
475ttystat(line, sz)
476	char *line;
477	int sz;
478{
479	static struct stat sb;
480	char ttybuf[MAXPATHLEN];
481
482	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
483	if (stat(ttybuf, &sb)) {
484		warn("%s", ttybuf);
485		return (NULL);
486	}
487	return (&sb);
488}
489
490static void
491usage(wcmd)
492	int wcmd;
493{
494	if (wcmd)
495		(void)fprintf(stderr,
496		    "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
497	else
498		(void)fprintf(stderr, "usage: uptime\n");
499	exit(1);
500}
501
502static int
503this_is_uptime(s)
504	const char *s;
505{
506	const char *u;
507
508	if ((u = strrchr(s, '/')) != NULL)
509		++u;
510	else
511		u = s;
512	if (strcmp(u, "uptime") == 0)
513		return (0);
514	return (-1);
515}
516