w.c revision 36031 
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 1.25 1998/04/19 18:32:01 phk 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             TTY      FROM              LOGIN@  IDLE WHAT\n"
250#define WUSED	(sizeof (HEADER) - sizeof ("WHAT\n"))
251		(void)printf(HEADER);
252	}
253
254	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
255		err(1, "%s", kvm_geterr(kd));
256	for (i = 0; i < nentries; i++, kp++) {
257		struct proc *p = &kp->kp_proc;
258		struct eproc *e;
259
260		if (p->p_stat == SIDL || p->p_stat == SZOMB)
261			continue;
262		e = &kp->kp_eproc;
263		for (ep = ehead; ep != NULL; ep = ep->next) {
264			if (ep->tdev == e->e_tdev) {
265				/*
266				 * proc is associated with this terminal
267				 */
268				if (ep->kp == NULL && e->e_pgid == e->e_tpgid) {
269					/*
270					 * Proc is 'most interesting'
271					 */
272					if (proc_compare(&ep->kp->kp_proc, p))
273						ep->kp = kp;
274				}
275				/*
276				 * Proc debug option info; add to debug
277				 * list using kinfo_proc kp_eproc.e_spare
278				 * as next pointer; ptr to ptr avoids the
279				 * ptr = long assumption.
280				 */
281				dkp = ep->dkp;
282				ep->dkp = kp;
283				*((struct kinfo_proc **)(&kp->kp_eproc.e_spare[ 0])) = dkp;
284			}
285		}
286	}
287	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
288	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
289	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
290	       ttywidth = 79;
291        else
292	       ttywidth = ws.ws_col - 1;
293	argwidth = ttywidth - WUSED;
294	if (argwidth < 4)
295		argwidth = 8;
296	for (ep = ehead; ep != NULL; ep = ep->next) {
297		if (ep->kp == NULL) {
298			ep->args = "-";
299			continue;
300		}
301		ep->args = fmt_argv(kvm_getargv(kd, ep->kp, argwidth),
302		    ep->kp->kp_proc.p_comm, MAXCOMLEN);
303		if (ep->args == NULL)
304			err(1, NULL);
305	}
306	/* sort by idle time */
307	if (sortidle && ehead != NULL) {
308		struct entry *from = ehead, *save;
309
310		ehead = NULL;
311		while (from != NULL) {
312			for (nextp = &ehead;
313			    (*nextp) && from->idle >= (*nextp)->idle;
314			    nextp = &(*nextp)->next)
315				continue;
316			save = from;
317			from = from->next;
318			save->next = *nextp;
319			*nextp = save;
320		}
321	}
322
323	if (!nflag)
324		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
325		    (p = strchr(domain, '.')) == 0)
326			domain[0] = '\0';
327		else {
328			domain[sizeof(domain) - 1] = '\0';
329			memmove(domain, p, strlen(p) + 1);
330		}
331
332	if ((vis_args = malloc(argwidth * 4 + 1)) == NULL)
333		errx(1, "malloc");
334	for (ep = ehead; ep != NULL; ep = ep->next) {
335		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
336		if ((x = strchr(p, ':')) != NULL)
337			*x++ = '\0';
338		if (!nflag && isdigit(*p) &&
339		    (long)(l = inet_addr(p)) != -1 &&
340		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
341			if (domain[0] != '\0') {
342				p = hp->h_name;
343				p += strlen(hp->h_name);
344				p -= strlen(domain);
345				if (p > hp->h_name && strcmp(p, domain) == 0)
346					*p = '\0';
347			}
348			p = hp->h_name;
349		}
350		if (nflag && *p && strcmp(p, "-") && inet_addr(p) == INADDR_NONE) {
351			hp = gethostbyname(p);
352
353			if (hp != NULL) {
354				struct in_addr in;
355
356				memmove(&in, hp->h_addr, sizeof(in));
357				p = inet_ntoa(in);
358			}
359		}
360		if (x) {
361			(void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
362			    ep->utmp.ut_host + UT_HOSTSIZE - x, x);
363			p = buf;
364		}
365		if( dflag) {
366			for( dkp = ep->dkp; dkp != NULL; dkp = *((struct kinfo_proc **)(&dkp->kp_eproc.e_spare[ 0]))) {
367				char *p;
368				p = fmt_argv(kvm_getargv(kd, dkp, argwidth),
369					    dkp->kp_proc.p_comm, MAXCOMLEN);
370				if (p == NULL)
371					p = "-";
372				(void)printf( "\t\t%-9d %s\n", dkp->kp_proc.p_pid, p);
373			}
374		}
375		(void)printf("%-*.*s %-*.*s %-*.*s ",
376		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
377		    UT_LINESIZE, UT_LINESIZE,
378		    strncmp(ep->utmp.ut_line, "tty", 3) &&
379		    strncmp(ep->utmp.ut_line, "cua", 3) ?
380		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
381		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
382		pr_attime(&ep->utmp.ut_time, &now);
383		longidle=pr_idle(ep->idle);
384		if (longidle)
385			argwidth--;
386		if (ep->args != NULL) {
387			arglen = strlen(ep->args);
388			strvisx(vis_args, ep->args,
389			    arglen > argwidth ? argwidth : arglen,
390			    VIS_TAB | VIS_NL | VIS_NOSLASH);
391		}
392		(void)printf("%.*s\n", argwidth, ep->args);
393	}
394	exit(0);
395}
396
397static void
398pr_header(nowp, nusers)
399	time_t *nowp;
400	int nusers;
401{
402	double avenrun[3];
403	time_t uptime;
404	int days, hrs, i, mins, secs;
405	int mib[2];
406	size_t size;
407	char buf[256];
408
409	/*
410	 * Print time of day.
411	 *
412	 * SCCS forces the string manipulation below, as it replaces
413	 * %, M, and % in a character string with the file name.
414	 */
415	(void)strftime(buf, sizeof(buf) - 1,
416	    __CONCAT("%l:%","M%p"), localtime(nowp));
417	buf[sizeof(buf) - 1] = '\0';
418	(void)printf("%s ", buf);
419
420	/*
421	 * Print how long system has been up.
422	 * (Found by looking getting "boottime" from the kernel)
423	 */
424	mib[0] = CTL_KERN;
425	mib[1] = KERN_BOOTTIME;
426	size = sizeof(boottime);
427	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
428	    boottime.tv_sec != 0) {
429		uptime = now - boottime.tv_sec;
430		uptime += 30;
431		days = uptime / 86400;
432		uptime %= 86400;
433		hrs = uptime / 3600;
434		uptime %= 3600;
435		mins = uptime / 60;
436		secs = uptime % 60;
437		(void)printf(" up");
438		if (days > 0)
439			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
440		if (hrs > 0 && mins > 0)
441			(void)printf(" %2d:%02d,", hrs, mins);
442		else if (hrs > 0)
443			(void)printf(" %d hr%s,",
444				     hrs, hrs > 1 ? "s" : "");
445		else if (mins > 0)
446			(void)printf(" %d min%s,",
447				     mins, mins > 1 ? "s" : "");
448		else
449			(void)printf(" %d sec%s,",
450				     secs, secs > 1 ? "s" : "");
451	}
452
453	/* Print number of users logged in to system */
454	(void)printf(" %d user%s", nusers, nusers == 1 ? "" : "s");
455
456	/*
457	 * Print 1, 5, and 15 minute load averages.
458	 */
459	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
460		(void)printf(", no load average information available\n");
461	else {
462		(void)printf(", load averages:");
463		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
464			if (i > 0)
465				(void)printf(",");
466			(void)printf(" %.2f", avenrun[i]);
467		}
468		(void)printf("\n");
469	}
470}
471
472static struct stat *
473ttystat(line)
474	char *line;
475{
476	static struct stat sb;
477	char ttybuf[MAXPATHLEN];
478
479	(void)snprintf(ttybuf, sizeof(ttybuf), "%s/%s", _PATH_DEV, line);
480	if (stat(ttybuf, &sb)) {
481		warn("%s", ttybuf);
482		return NULL;
483	}
484	return (&sb);
485}
486
487static void
488usage(wcmd)
489	int wcmd;
490{
491	if (wcmd)
492		(void)fprintf(stderr,
493		    "usage: w [-dhin] [-M core] [-N system] [user]\n");
494	else
495		(void)fprintf(stderr,
496			"usage: uptime\n");
497	exit (1);
498}
499