w.c revision 36276 
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 1.26 1998/05/14 10:13:24 jkoshy 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 bu idle time */
101char	       *sel_user;	/* login of particular user 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
117static void	 pr_header __P((time_t *, int));
118static struct stat
119		*ttystat __P((char *));
120static void	 usage __P((int));
121
122char *fmt_argv __P((char **, char *, int));	/* ../../bin/ps/fmt.c */
123
124int
125main(argc, argv)
126	int argc;
127	char **argv;
128{
129	extern char *__progname;
130	struct kinfo_proc *kp;
131	struct kinfo_proc *dkp;
132	struct hostent *hp;
133	struct stat *stp;
134	FILE *ut;
135	u_long l;
136	size_t arglen;
137	int ch, i, nentries, nusers, wcmd, longidle;
138	char *memf, *nlistf, *p, *vis_args, *x;
139	char buf[MAXHOSTNAMELEN], errbuf[256];
140
141	(void) setlocale(LC_ALL, "");
142
143	/* Are we w(1) or uptime(1)? */
144	p = __progname;
145	if (*p == '-')
146		p++;
147	if (*p == 'u') {
148		wcmd = 0;
149		p = "";
150	} else {
151		wcmd = 1;
152		p = "dhiflM:N:nsuw";
153	}
154
155	memf = nlistf = NULL;
156	while ((ch = getopt(argc, argv, p)) != -1)
157		switch (ch) {
158		case 'd':
159			dflag = 1;
160			break;
161		case 'h':
162			header = 0;
163			break;
164		case 'i':
165			sortidle = 1;
166			break;
167		case 'M':
168			header = 0;
169			memf = optarg;
170			break;
171		case 'N':
172			nlistf = optarg;
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 (nlistf != NULL || memf != NULL)
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_user = *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))) /* corrupted record */
213			continue;
214		++nusers;
215		if (wcmd == 0 || (sel_user &&
216		    strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
217			continue;
218		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
219			errx(1, "calloc");
220		*nextp = ep;
221		nextp = &(ep->next);
222		memmove(&(ep->utmp), &utmp, sizeof(struct utmp));
223		ep->tdev = stp->st_rdev;
224#ifdef CPU_CONSDEV
225		/*
226		 * If this is the console device, attempt to ascertain
227		 * the true console device dev_t.
228		 */
229		if (ep->tdev == 0) {
230			int mib[2];
231			size_t size;
232
233			mib[0] = CTL_MACHDEP;
234			mib[1] = CPU_CONSDEV;
235			size = sizeof(dev_t);
236			(void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
237		}
238#endif
239		if ((ep->idle = now - stp->st_atime) < 0)
240			ep->idle = 0;
241	}
242	(void)fclose(ut);
243
244	if (header || wcmd == 0) {
245		pr_header(&now, nusers);
246		if (wcmd == 0)
247			exit (0);
248
249#define HEADER_USER		"USER"
250#define HEADER_TTY		"TTY"
251#define HEADER_FROM		"FROM"
252#define HEADER_LOGIN_IDLE	"LOGIN@  IDLE "
253#define HEADER_WHAT		"WHAT\n"
254#define WUSED  (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
255		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */
256		(void)printf("%-*.*s %-*.*s %-*.*s  %s",
257				UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
258				UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
259				UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM,
260				HEADER_LOGIN_IDLE HEADER_WHAT);
261	}
262
263	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
264		err(1, "%s", kvm_geterr(kd));
265	for (i = 0; i < nentries; i++, kp++) {
266		struct proc *p = &kp->kp_proc;
267		struct eproc *e;
268
269		if (p->p_stat == SIDL || p->p_stat == SZOMB)
270			continue;
271		e = &kp->kp_eproc;
272		for (ep = ehead; ep != NULL; ep = ep->next) {
273			if (ep->tdev == e->e_tdev) {
274				/*
275				 * proc is associated with this terminal
276				 */
277				if (ep->kp == NULL && e->e_pgid == e->e_tpgid) {
278					/*
279					 * Proc is 'most interesting'
280					 */
281					if (proc_compare(&ep->kp->kp_proc, p))
282						ep->kp = kp;
283				}
284				/*
285				 * Proc debug option info; add to debug
286				 * list using kinfo_proc kp_eproc.e_spare
287				 * as next pointer; ptr to ptr avoids the
288				 * ptr = long assumption.
289				 */
290				dkp = ep->dkp;
291				ep->dkp = kp;
292				*((struct kinfo_proc **)(&kp->kp_eproc.e_spare[ 0])) = dkp;
293			}
294		}
295	}
296	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
297	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
298	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
299	       ttywidth = 79;
300        else
301	       ttywidth = ws.ws_col - 1;
302	argwidth = ttywidth - WUSED;
303	if (argwidth < 4)
304		argwidth = 8;
305	for (ep = ehead; ep != NULL; ep = ep->next) {
306		if (ep->kp == NULL) {
307			ep->args = "-";
308			continue;
309		}
310		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
311		    ep->kp->kp_proc.p_comm, MAXCOMLEN);
312		if (ep->args == NULL)
313			err(1, NULL);
314	}
315	/* sort by idle time */
316	if (sortidle && ehead != NULL) {
317		struct entry *from = ehead, *save;
318
319		ehead = NULL;
320		while (from != NULL) {
321			for (nextp = &ehead;
322			    (*nextp) && from->idle >= (*nextp)->idle;
323			    nextp = &(*nextp)->next)
324				continue;
325			save = from;
326			from = from->next;
327			save->next = *nextp;
328			*nextp = save;
329		}
330	}
331
332	if (!nflag)
333		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
334		    (p = strchr(domain, '.')) == 0)
335			domain[0] = '\0';
336		else {
337			domain[sizeof(domain) - 1] = '\0';
338			memmove(domain, p, strlen(p) + 1);
339		}
340
341	if ((vis_args = malloc(argwidth * 4 + 1)) == NULL)
342		errx(1, "malloc");
343	for (ep = ehead; ep != NULL; ep = ep->next) {
344		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
345		if ((x = strchr(p, ':')) != NULL)
346			*x++ = '\0';
347		if (!nflag && isdigit(*p) &&
348		    (long)(l = inet_addr(p)) != -1 &&
349		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
350			if (domain[0] != '\0') {
351				p = hp->h_name;
352				p += strlen(hp->h_name);
353				p -= strlen(domain);
354				if (p > hp->h_name && strcmp(p, domain) == 0)
355					*p = '\0';
356			}
357			p = hp->h_name;
358		}
359		if (nflag && *p && strcmp(p, "-") && inet_addr(p) == INADDR_NONE) {
360			hp = gethostbyname(p);
361
362			if (hp != NULL) {
363				struct in_addr in;
364
365				memmove(&in, hp->h_addr, sizeof(in));
366				p = inet_ntoa(in);
367			}
368		}
369		if (x) {
370			(void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
371			    ep->utmp.ut_host + UT_HOSTSIZE - x, x);
372			p = buf;
373		}
374		if( dflag) {
375			for( dkp = ep->dkp; dkp != NULL; dkp = *((struct kinfo_proc **)(&dkp->kp_eproc.e_spare[ 0]))) {
376				char *p;
377				p = fmt_argv(kvm_getargv(kd, dkp, argwidth),
378					    dkp->kp_proc.p_comm, MAXCOMLEN);
379				if (p == NULL)
380					p = "-";
381				(void)printf( "\t\t%-9d %s\n", dkp->kp_proc.p_pid, p);
382			}
383		}
384		(void)printf("%-*.*s %-*.*s %-*.*s ",
385		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
386		    UT_LINESIZE, UT_LINESIZE,
387		    strncmp(ep->utmp.ut_line, "tty", 3) &&
388		    strncmp(ep->utmp.ut_line, "cua", 3) ?
389		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
390		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
391		pr_attime(&ep->utmp.ut_time, &now);
392		longidle=pr_idle(ep->idle);
393		if (longidle)
394			argwidth--;
395		if (ep->args != NULL) {
396			arglen = strlen(ep->args);
397			strvisx(vis_args, ep->args,
398			    arglen > argwidth ? argwidth : arglen,
399			    VIS_TAB | VIS_NL | VIS_NOSLASH);
400		}
401		(void)printf("%.*s\n", argwidth, ep->args);
402	}
403	exit(0);
404}
405
406static void
407pr_header(nowp, nusers)
408	time_t *nowp;
409	int nusers;
410{
411	double avenrun[3];
412	time_t uptime;
413	int days, hrs, i, mins, secs;
414	int mib[2];
415	size_t size;
416	char buf[256];
417
418	/*
419	 * Print time of day.
420	 *
421	 * SCCS forces the string manipulation below, as it replaces
422	 * %, M, and % in a character string with the file name.
423	 */
424	(void)strftime(buf, sizeof(buf) - 1,
425	    __CONCAT("%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,",
453				     hrs, hrs > 1 ? "s" : "");
454		else if (mins > 0)
455			(void)printf(" %d min%s,",
456				     mins, mins > 1 ? "s" : "");
457		else
458			(void)printf(" %d sec%s,",
459				     secs, secs > 1 ? "s" : "");
460	}
461
462	/* Print number of users logged in to system */
463	(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
464
465	/*
466	 * Print 1, 5, and 15 minute load averages.
467	 */
468	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
469		(void)printf(", no load average information available\n");
470	else {
471		(void)printf(", load averages:");
472		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
473			if (i > 0)
474				(void)printf(",");
475			(void)printf(" %.2f", avenrun[i]);
476		}
477		(void)printf("\n");
478	}
479}
480
481static struct stat *
482ttystat(line)
483	char *line;
484{
485	static struct stat sb;
486	char ttybuf[MAXPATHLEN];
487
488	(void)snprintf(ttybuf, sizeof(ttybuf), "%s/%s", _PATH_DEV, line);
489	if (stat(ttybuf, &sb)) {
490		warn("%s", ttybuf);
491		return NULL;
492	}
493	return (&sb);
494}
495
496static void
497usage(wcmd)
498	int wcmd;
499{
500	if (wcmd)
501		(void)fprintf(stderr,
502		    "usage: w [-dhin] [-M core] [-N system] [user]\n");
503	else
504		(void)fprintf(stderr,
505			"usage: uptime\n");
506	exit (1);
507}
508