w.c revision 49177 
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	"$Id: w.c,v 1.35 1999/07/04 17:26:12 billf Exp $";
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)->kp_eproc.e_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;
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	memf = nlistf = NULL;
153	while ((ch = getopt(argc, argv, p)) != -1)
154		switch (ch) {
155		case 'd':
156			dflag = 1;
157			break;
158		case 'h':
159			header = 0;
160			break;
161		case 'i':
162			sortidle = 1;
163			break;
164		case 'M':
165			header = 0;
166			memf = optarg;
167			break;
168		case 'N':
169			nlistf = optarg;
170			break;
171		case 'n':
172			nflag = 1;
173			break;
174		case 'f': case 'l': case 's': case 'u': case 'w':
175			warnx("[-flsuw] no longer supported");
176			/* FALLTHROUGH */
177		case '?':
178		default:
179			usage(wcmd);
180		}
181	argc -= optind;
182	argv += optind;
183
184	if (!(_res.options & RES_INIT))
185		res_init();
186	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
187	_res.retry = 1;		/* only try once.. */
188
189	/*
190	 * Discard setgid privileges if not the running kernel so that bad
191	 * guys can't print interesting stuff from kernel memory.
192	 */
193	if (nlistf != NULL || memf != NULL)
194		setgid(getgid());
195
196	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
197		errx(1, "%s", errbuf);
198
199	(void)time(&now);
200	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
201		err(1, "%s", _PATH_UTMP);
202
203	if (*argv)
204		sel_users = argv;
205
206	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
207		if (utmp.ut_name[0] == '\0')
208			continue;
209		if (!(stp = ttystat(utmp.ut_line, UT_LINESIZE)))
210			continue;	/* corrupted record */
211		++nusers;
212		if (wcmd == 0)
213			continue;
214		if (sel_users) {
215			int usermatch;
216			char **user;
217
218			usermatch = 0;
219			for (user = sel_users; !usermatch && *user; user++)
220				if (!strncmp(utmp.ut_name, *user, UT_NAMESIZE))
221					usermatch = 1;
222			if (!usermatch)
223				continue;
224		}
225		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
226			errx(1, "calloc");
227		*nextp = ep;
228		nextp = &ep->next;
229		memmove(&ep->utmp, &utmp, sizeof(struct utmp));
230		ep->tdev = stp->st_rdev;
231#ifdef CPU_CONSDEV
232		/*
233		 * If this is the console device, attempt to ascertain
234		 * the true console device dev_t.
235		 */
236		if (ep->tdev == 0) {
237			int mib[2];
238			size_t size;
239
240			mib[0] = CTL_MACHDEP;
241			mib[1] = CPU_CONSDEV;
242			size = sizeof(dev_t);
243			(void)sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
244		}
245#endif
246		if ((ep->idle = now - stp->st_atime) < 0)
247			ep->idle = 0;
248	}
249	(void)fclose(ut);
250
251	if (header || wcmd == 0) {
252		pr_header(&now, nusers);
253		if (wcmd == 0)
254			exit(0);
255
256#define HEADER_USER		"USER"
257#define HEADER_TTY		"TTY"
258#define HEADER_FROM		"FROM"
259#define HEADER_LOGIN_IDLE	"LOGIN@  IDLE "
260#define HEADER_WHAT		"WHAT\n"
261#define WUSED  (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
262		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */
263		(void)printf("%-*.*s %-*.*s %-*.*s  %s",
264				UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
265				UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
266				UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM,
267				HEADER_LOGIN_IDLE HEADER_WHAT);
268	}
269
270	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
271		err(1, "%s", kvm_geterr(kd));
272	for (i = 0; i < nentries; i++, kp++) {
273		struct proc *pr = &kp->kp_proc;
274		struct eproc *e;
275
276		if (pr->p_stat == SIDL || pr->p_stat == SZOMB)
277			continue;
278		e = &kp->kp_eproc;
279		for (ep = ehead; ep != NULL; ep = ep->next) {
280			if (ep->tdev == e->e_tdev) {
281				/*
282				 * proc is associated with this terminal
283				 */
284				if (ep->kp == NULL && e->e_pgid == e->e_tpgid) {
285					/*
286					 * Proc is 'most interesting'
287					 */
288					if (proc_compare(&ep->kp->kp_proc, pr))
289						ep->kp = kp;
290				}
291				/*
292				 * Proc debug option info; add to debug
293				 * list using kinfo_proc kp_eproc.e_spare
294				 * as next pointer; ptr to ptr avoids the
295				 * ptr = long assumption.
296				 */
297				dkp = ep->dkp;
298				ep->dkp = kp;
299				debugproc(kp) = dkp;
300			}
301		}
302	}
303	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
304	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
305	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
306	       ttywidth = 79;
307        else
308	       ttywidth = ws.ws_col - 1;
309	argwidth = ttywidth - WUSED;
310	if (argwidth < 4)
311		argwidth = 8;
312	for (ep = ehead; ep != NULL; ep = ep->next) {
313		if (ep->kp == NULL) {
314			ep->args = "-";
315			continue;
316		}
317		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
318		    ep->kp->kp_proc.p_comm, MAXCOMLEN);
319		if (ep->args == NULL)
320			err(1, NULL);
321	}
322	/* sort by idle time */
323	if (sortidle && ehead != NULL) {
324		struct entry *from, *save;
325
326		from = ehead;
327		ehead = NULL;
328		while (from != NULL) {
329			for (nextp = &ehead;
330			    (*nextp) && from->idle >= (*nextp)->idle;
331			    nextp = &(*nextp)->next)
332				continue;
333			save = from;
334			from = from->next;
335			save->next = *nextp;
336			*nextp = save;
337		}
338	}
339
340	if (!nflag) {
341		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
342		    (p = strchr(domain, '.')) == NULL)
343			domain[0] = '\0';
344		else {
345			domain[sizeof(domain) - 1] = '\0';
346			memmove(domain, p, strlen(p) + 1);
347		}
348	}
349
350	for (ep = ehead; ep != NULL; ep = ep->next) {
351		char host_buf[UT_HOSTSIZE + 1];
352
353		host_buf[UT_HOSTSIZE] = '\0';
354		strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
355		p = *host_buf ? host_buf : "-";
356		if ((x = strchr(p, ':')) != NULL)
357			*x++ = '\0';
358		if (!nflag && isdigit(*p) && (l = inet_addr(p)) != -1 &&
359		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
360			if (domain[0] != '\0') {
361				p = hp->h_name;
362				p += strlen(hp->h_name);
363				p -= strlen(domain);
364				if (p > hp->h_name && strcmp(p, domain) == 0)
365					*p = '\0';
366			}
367			p = hp->h_name;
368		}
369		if (nflag && *p && strcmp(p, "-") &&
370		    inet_addr(p) == INADDR_NONE) {
371			hp = gethostbyname(p);
372
373			if (hp != NULL) {
374				struct in_addr in;
375
376				memmove(&in, hp->h_addr, sizeof(in));
377				p = inet_ntoa(in);
378			}
379		}
380		if (x) {
381			(void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
382			p = buf;
383		}
384		if (dflag) {
385			for (dkp = ep->dkp; dkp != NULL; dkp = debugproc(dkp)) {
386				char *ptr;
387
388				ptr = fmt_argv(kvm_getargv(kd, dkp, argwidth),
389				    dkp->kp_proc.p_comm, MAXCOMLEN);
390				if (ptr == NULL)
391					ptr = "-";
392				(void)printf("\t\t%-9d %s\n",
393				    dkp->kp_proc.p_pid, ptr);
394			}
395		}
396		(void)printf("%-*.*s %-*.*s %-*.*s ",
397		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
398		    UT_LINESIZE, UT_LINESIZE,
399		    strncmp(ep->utmp.ut_line, "tty", 3) &&
400		    strncmp(ep->utmp.ut_line, "cua", 3) ?
401		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
402		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
403		pr_attime(&ep->utmp.ut_time, &now);
404		longidle = pr_idle(ep->idle);
405		(void)printf("%.*s\n", argwidth - longidle, ep->args);
406	}
407	exit(0);
408}
409
410static void
411pr_header(nowp, nusers)
412	time_t *nowp;
413	int nusers;
414{
415	double avenrun[3];
416	time_t uptime;
417	int days, hrs, i, mins, secs;
418	int mib[2];
419	size_t size;
420	char buf[256];
421
422	/*
423	 * Print time of day.
424	 */
425	(void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp));
426	buf[sizeof(buf) - 1] = '\0';
427	(void)printf("%s ", buf);
428
429	/*
430	 * Print how long system has been up.
431	 * (Found by looking getting "boottime" from the kernel)
432	 */
433	mib[0] = CTL_KERN;
434	mib[1] = KERN_BOOTTIME;
435	size = sizeof(boottime);
436	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
437	    boottime.tv_sec != 0) {
438		uptime = now - boottime.tv_sec;
439		uptime += 30;
440		days = uptime / 86400;
441		uptime %= 86400;
442		hrs = uptime / 3600;
443		uptime %= 3600;
444		mins = uptime / 60;
445		secs = uptime % 60;
446		(void)printf(" up");
447		if (days > 0)
448			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
449		if (hrs > 0 && mins > 0)
450			(void)printf(" %2d:%02d,", hrs, mins);
451		else if (hrs > 0)
452			(void)printf(" %d hr%s,", hrs, hrs > 1 ? "s" : "");
453		else if (mins > 0)
454			(void)printf(" %d min%s,", mins, mins > 1 ? "s" : "");
455		else
456			(void)printf(" %d sec%s,", secs, secs > 1 ? "s" : "");
457	}
458
459	/* Print number of users logged in to system */
460	(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
461
462	/*
463	 * Print 1, 5, and 15 minute load averages.
464	 */
465	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
466		(void)printf(", no load average information available\n");
467	else {
468		(void)printf(", load averages:");
469		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++)
470			(void)printf("%s %.2f", i > 0 ? "," : "", avenrun[i]);
471		(void)printf("\n");
472	}
473}
474
475static struct stat *
476ttystat(line, sz)
477	char *line;
478	int sz;
479{
480	static struct stat sb;
481	char ttybuf[MAXPATHLEN];
482
483	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, sz, line);
484	if (stat(ttybuf, &sb)) {
485		warn("%s", ttybuf);
486		return (NULL);
487	}
488	return (&sb);
489}
490
491static void
492usage(wcmd)
493	int wcmd;
494{
495	if (wcmd)
496		(void)fprintf(stderr,
497		    "usage: w [-dhin] [-M core] [-N system] [user ...]\n");
498	else
499		(void)fprintf(stderr, "usage: uptime\n");
500	exit(1);
501}
502
503static int
504this_is_uptime(s)
505	const char *s;
506{
507	const char *u;
508
509	if ((u = strrchr(s, '/')) != NULL)
510		++u;
511	else
512		u = s;
513	if (strcmp(u, "uptime") == 0)
514		return (0);
515	return (-1);
516}
517