w.c revision 42481 
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 1.31 1998/12/24 23:27:33 dillon 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_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));
121static int	this_is_uptime __P((const char *s));
122
123char *fmt_argv __P((char **, char *, int));	/* ../../bin/ps/fmt.c */
124
125int
126main(argc, argv)
127	int argc;
128	char **argv;
129{
130	extern char *__progname;
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	size_t arglen;
138	int ch, i, nentries, nusers, wcmd, longidle;
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	memf = nlistf = NULL;
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			break;
169		case 'N':
170			nlistf = optarg;
171			break;
172		case 'n':
173			nflag = 1;
174			break;
175		case 'f': case 'l': case 's': case 'u': case 'w':
176			warnx("[-flsuw] no longer supported");
177			/* FALLTHROUGH */
178		case '?':
179		default:
180			usage(wcmd);
181		}
182	argc -= optind;
183	argv += optind;
184
185	if (!(_res.options & RES_INIT))
186		res_init();
187	_res.retrans = 2;	/* resolver timeout to 2 seconds per try */
188	_res.retry = 1;		/* only try once.. */
189
190	/*
191	 * Discard setgid privileges if not the running kernel so that bad
192	 * guys can't print interesting stuff from kernel memory.
193	 */
194	if (nlistf != NULL || memf != NULL)
195		setgid(getgid());
196
197	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
198		errx(1, "%s", errbuf);
199
200	(void)time(&now);
201	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
202		err(1, "%s", _PATH_UTMP);
203
204	if (*argv)
205		sel_user = *argv;
206
207	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
208		if (utmp.ut_name[0] == '\0')
209			continue;
210		if (!(stp = ttystat(utmp.ut_line))) /* corrupted record */
211			continue;
212		++nusers;
213		if (wcmd == 0 || (sel_user &&
214		    strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
215			continue;
216		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
217			errx(1, "calloc");
218		*nextp = ep;
219		nextp = &(ep->next);
220		memmove(&(ep->utmp), &utmp, sizeof(struct utmp));
221		ep->tdev = stp->st_rdev;
222#ifdef CPU_CONSDEV
223		/*
224		 * If this is the console device, attempt to ascertain
225		 * the true console device dev_t.
226		 */
227		if (ep->tdev == 0) {
228			int mib[2];
229			size_t size;
230
231			mib[0] = CTL_MACHDEP;
232			mib[1] = CPU_CONSDEV;
233			size = sizeof(dev_t);
234			(void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
235		}
236#endif
237		if ((ep->idle = now - stp->st_atime) < 0)
238			ep->idle = 0;
239	}
240	(void)fclose(ut);
241
242	if (header || wcmd == 0) {
243		pr_header(&now, nusers);
244		if (wcmd == 0)
245			exit (0);
246
247#define HEADER_USER		"USER"
248#define HEADER_TTY		"TTY"
249#define HEADER_FROM		"FROM"
250#define HEADER_LOGIN_IDLE	"LOGIN@  IDLE "
251#define HEADER_WHAT		"WHAT\n"
252#define WUSED  (UT_NAMESIZE + UT_LINESIZE + UT_HOSTSIZE + \
253		sizeof(HEADER_LOGIN_IDLE) + 3)	/* header width incl. spaces */
254		(void)printf("%-*.*s %-*.*s %-*.*s  %s",
255				UT_NAMESIZE, UT_NAMESIZE, HEADER_USER,
256				UT_LINESIZE, UT_LINESIZE, HEADER_TTY,
257				UT_HOSTSIZE, UT_HOSTSIZE, HEADER_FROM,
258				HEADER_LOGIN_IDLE HEADER_WHAT);
259	}
260
261	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
262		err(1, "%s", kvm_geterr(kd));
263	for (i = 0; i < nentries; i++, kp++) {
264		struct proc *p = &kp->kp_proc;
265		struct eproc *e;
266
267		if (p->p_stat == SIDL || p->p_stat == SZOMB)
268			continue;
269		e = &kp->kp_eproc;
270		for (ep = ehead; ep != NULL; ep = ep->next) {
271			if (ep->tdev == e->e_tdev) {
272				/*
273				 * proc is associated with this terminal
274				 */
275				if (ep->kp == NULL && e->e_pgid == e->e_tpgid) {
276					/*
277					 * Proc is 'most interesting'
278					 */
279					if (proc_compare(&ep->kp->kp_proc, p))
280						ep->kp = kp;
281				}
282				/*
283				 * Proc debug option info; add to debug
284				 * list using kinfo_proc kp_eproc.e_spare
285				 * as next pointer; ptr to ptr avoids the
286				 * ptr = long assumption.
287				 */
288				dkp = ep->dkp;
289				ep->dkp = kp;
290				*((struct kinfo_proc **)(&kp->kp_eproc.e_spare[0])) = dkp;
291			}
292		}
293	}
294	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
295	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
296	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
297	       ttywidth = 79;
298        else
299	       ttywidth = ws.ws_col - 1;
300	argwidth = ttywidth - WUSED;
301	if (argwidth < 4)
302		argwidth = 8;
303	for (ep = ehead; ep != NULL; ep = ep->next) {
304		if (ep->kp == NULL) {
305			ep->args = "-";
306			continue;
307		}
308		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
309		    ep->kp->kp_proc.p_comm, MAXCOMLEN);
310		if (ep->args == NULL)
311			err(1, NULL);
312	}
313	/* sort by idle time */
314	if (sortidle && ehead != NULL) {
315		struct entry *from = ehead, *save;
316
317		ehead = NULL;
318		while (from != NULL) {
319			for (nextp = &ehead;
320			    (*nextp) && from->idle >= (*nextp)->idle;
321			    nextp = &(*nextp)->next)
322				continue;
323			save = from;
324			from = from->next;
325			save->next = *nextp;
326			*nextp = save;
327		}
328	}
329
330	if (!nflag)
331		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
332		    (p = strchr(domain, '.')) == 0)
333			domain[0] = '\0';
334		else {
335			domain[sizeof(domain) - 1] = '\0';
336			memmove(domain, p, strlen(p) + 1);
337		}
338
339	for (ep = ehead; ep != NULL; ep = ep->next) {
340		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
341		if ((x = strchr(p, ':')) != NULL)
342			*x++ = '\0';
343		if (!nflag && isdigit(*p) &&
344		    (long)(l = inet_addr(p)) != -1 &&
345		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
346			if (domain[0] != '\0') {
347				p = hp->h_name;
348				p += strlen(hp->h_name);
349				p -= strlen(domain);
350				if (p > hp->h_name && strcmp(p, domain) == 0)
351					*p = '\0';
352			}
353			p = hp->h_name;
354		}
355		if (nflag && *p && strcmp(p, "-") &&
356		    inet_addr(p) == INADDR_NONE) {
357			hp = gethostbyname(p);
358
359			if (hp != NULL) {
360				struct in_addr in;
361
362				memmove(&in, hp->h_addr, sizeof(in));
363				p = inet_ntoa(in);
364			}
365		}
366		if (x) {
367			(void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
368			    ep->utmp.ut_host + UT_HOSTSIZE - x, x);
369			p = buf;
370		}
371		if (dflag) {
372			for (dkp = ep->dkp; dkp != NULL; dkp = *((struct kinfo_proc **)(&dkp->kp_eproc.e_spare[0]))) {
373				char *p;
374				p = fmt_argv(kvm_getargv(kd, dkp, argwidth),
375					    dkp->kp_proc.p_comm, MAXCOMLEN);
376				if (p == NULL)
377					p = "-";
378				(void)printf( "\t\t%-9d %s\n", dkp->kp_proc.p_pid, p);
379			}
380		}
381		(void)printf("%-*.*s %-*.*s %-*.*s ",
382		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
383		    UT_LINESIZE, UT_LINESIZE,
384		    strncmp(ep->utmp.ut_line, "tty", 3) &&
385		    strncmp(ep->utmp.ut_line, "cua", 3) ?
386		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
387		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
388		pr_attime(&ep->utmp.ut_time, &now);
389		longidle = pr_idle(ep->idle);
390		(void)printf("%.*s\n", argwidth - longidle, ep->args);
391	}
392	exit(0);
393}
394
395static void
396pr_header(nowp, nusers)
397	time_t *nowp;
398	int nusers;
399{
400	double avenrun[3];
401	time_t uptime;
402	int days, hrs, i, mins, secs;
403	int mib[2];
404	size_t size;
405	char buf[256];
406
407	/*
408	 * Print time of day.
409	 *
410	 * SCCS forces the string manipulation below, as it replaces
411	 * %, M, and % in a character string with the file name.
412	 */
413	(void)strftime(buf, sizeof(buf) - 1,
414	    __CONCAT("%l:%","M%p"), localtime(nowp));
415	buf[sizeof(buf) - 1] = '\0';
416	(void)printf("%s ", buf);
417
418	/*
419	 * Print how long system has been up.
420	 * (Found by looking getting "boottime" from the kernel)
421	 */
422	mib[0] = CTL_KERN;
423	mib[1] = KERN_BOOTTIME;
424	size = sizeof(boottime);
425	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
426	    boottime.tv_sec != 0) {
427		uptime = now - boottime.tv_sec;
428		uptime += 30;
429		days = uptime / 86400;
430		uptime %= 86400;
431		hrs = uptime / 3600;
432		uptime %= 3600;
433		mins = uptime / 60;
434		secs = uptime % 60;
435		(void)printf(" up");
436		if (days > 0)
437			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
438		if (hrs > 0 && mins > 0)
439			(void)printf(" %2d:%02d,", hrs, mins);
440		else if (hrs > 0)
441			(void)printf(" %d hr%s,",
442				     hrs, hrs > 1 ? "s" : "");
443		else if (mins > 0)
444			(void)printf(" %d min%s,",
445				     mins, mins > 1 ? "s" : "");
446		else
447			(void)printf(" %d sec%s,",
448				     secs, secs > 1 ? "s" : "");
449	}
450
451	/* Print number of users logged in to system */
452	(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
453
454	/*
455	 * Print 1, 5, and 15 minute load averages.
456	 */
457	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
458		(void)printf(", no load average information available\n");
459	else {
460		(void)printf(", load averages:");
461		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
462			if (i > 0)
463				(void)printf(",");
464			(void)printf(" %.2f", avenrun[i]);
465		}
466		(void)printf("\n");
467	}
468}
469
470static struct stat *
471ttystat(line)
472	char *line;
473{
474	static struct stat sb;
475	char ttybuf[MAXPATHLEN];
476
477	(void)snprintf(ttybuf, sizeof(ttybuf), "%s/%s", _PATH_DEV, line);
478	if (stat(ttybuf, &sb)) {
479		warn("%s", ttybuf);
480		return NULL;
481	}
482	return (&sb);
483}
484
485static void
486usage(wcmd)
487	int wcmd;
488{
489	if (wcmd)
490		(void)fprintf(stderr,
491		    "usage: w [-dhin] [-M core] [-N system] [user]\n");
492	else
493		(void)fprintf(stderr,
494			"usage: uptime\n");
495	exit (1);
496}
497
498static int
499this_is_uptime(s)
500	const char *s;
501{
502	const char *u;
503
504	if ((u = strrchr(s, '/')) != NULL)
505		++u;
506	else
507		u = s;
508	if (strcmp(u, "uptime") == 0)
509		return(0);
510	return(-1);
511}
512
513