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w.c revision 1.34 
      1 /*	$NetBSD: w.c,v 1.34 1999/11/29 11:15:13 pk Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 1980, 1991, 1993, 1994
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 __COPYRIGHT("@(#) Copyright (c) 1980, 1991, 1993, 1994\n\
     39 	The Regents of the University of California.  All rights reserved.\n");
     40 #endif /* not lint */
     41 
     42 #ifndef lint
     43 #if 0
     44 static char sccsid[] = "@(#)w.c	8.6 (Berkeley) 6/30/94";
     45 #else
     46 __RCSID("$NetBSD: w.c,v 1.34 1999/11/29 11:15:13 pk Exp $");
     47 #endif
     48 #endif /* not lint */
     49 
     50 /*
     51  * w - print system status (who and what)
     52  *
     53  * This program is similar to the systat command on Tenex/Tops 10/20
     54  *
     55  */
     56 #include <sys/param.h>
     57 #include <sys/time.h>
     58 #include <sys/stat.h>
     59 #include <sys/sysctl.h>
     60 #include <sys/proc.h>
     61 #include <sys/user.h>
     62 #include <sys/ioctl.h>
     63 #include <sys/socket.h>
     64 
     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 <limits.h>
     74 #include <netdb.h>
     75 #include <nlist.h>
     76 #include <paths.h>
     77 #include <stdio.h>
     78 #include <stdlib.h>
     79 #include <string.h>
     80 #include <time.h>
     81 #include <tzfile.h>
     82 #include <unistd.h>
     83 #include <utmp.h>
     84 #include <vis.h>
     85 
     86 #include "extern.h"
     87 
     88 struct timeval	boottime;
     89 struct utmp	utmp;
     90 struct winsize	ws;
     91 kvm_t	       *kd;
     92 time_t		now;		/* the current time of day */
     93 time_t		uptime;		/* time of last reboot & elapsed time since */
     94 int		ttywidth;	/* width of tty */
     95 int		argwidth;	/* width of tty */
     96 int		header = 1;	/* true if -h flag: don't print heading */
     97 int		nflag;		/* true if -n flag: don't convert addrs */
     98 int		sortidle;	/* sort bu idle time */
     99 char	       *sel_user;	/* login of particular user selected */
    100 char		domain[MAXHOSTNAMELEN + 1];
    101 
    102 /*
    103  * One of these per active utmp entry.
    104  */
    105 struct	entry {
    106 	struct	entry *next;
    107 	struct	utmp utmp;
    108 	dev_t	tdev;		/* dev_t of terminal */
    109 	time_t	idle;		/* idle time of terminal in seconds */
    110 	struct	kinfo_proc *kp;	/* `most interesting' proc */
    111 } *ep, *ehead = NULL, **nextp = &ehead;
    112 
    113 static void	 pr_args __P((struct kinfo_proc *));
    114 static void	 pr_header __P((time_t *, int));
    115 static struct stat
    116 		*ttystat __P((char *));
    117 static void	 usage __P((int));
    118 int	main __P((int, char **));
    119 
    120 int
    121 main(argc, argv)
    122 	int argc;
    123 	char **argv;
    124 {
    125 	extern char *__progname;
    126 	struct kinfo_proc *kp;
    127 	struct hostent *hp;
    128 	struct stat *stp;
    129 	FILE *ut;
    130 	struct in_addr l;
    131 	int ch, i, nentries, nusers, wcmd;
    132 	gid_t egid = getegid();
    133 	char *memf, *nlistf, *p, *x;
    134 	char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
    135 
    136 	(void)setegid(getgid());
    137 
    138 	/* Are we w(1) or uptime(1)? */
    139 	p = __progname;
    140 	if (*p == '-')
    141 		p++;
    142 	if (*p == 'u') {
    143 		wcmd = 0;
    144 		p = "";
    145 	} else {
    146 		wcmd = 1;
    147 		p = "hiflM:N:nsuw";
    148 	}
    149 
    150 	memf = nlistf = NULL;
    151 	while ((ch = getopt(argc, argv, p)) != -1)
    152 		switch (ch) {
    153 		case 'h':
    154 			header = 0;
    155 			break;
    156 		case 'i':
    157 			sortidle = 1;
    158 			break;
    159 		case 'M':
    160 			header = 0;
    161 			memf = optarg;
    162 			break;
    163 		case 'N':
    164 			nlistf = optarg;
    165 			break;
    166 		case 'n':
    167 			nflag = 1;
    168 			break;
    169 		case 'f': case 'l': case 's': case 'u': case 'w':
    170 			warnx("[-flsuw] no longer supported");
    171 			/* FALLTHROUGH */
    172 		case '?':
    173 		default:
    174 			usage(wcmd);
    175 		}
    176 	argc -= optind;
    177 	argv += optind;
    178 
    179 	/*
    180 	 * Discard setgid privileges.  If not the running kernel, we toss
    181 	 * them away totally so that bad guys can't print interesting stuff
    182 	 * from kernel memory, otherwise switch back to kmem for the
    183 	 * duration of the kvm_openfiles() call.
    184 	 */
    185 	if (nlistf != NULL || memf != NULL)
    186 		(void)setgid(getgid());
    187 	else
    188 		(void)setegid(egid);
    189 
    190 	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
    191 		errx(1, "%s", errbuf);
    192 
    193 	/* get rid of it now anyway */
    194 	if (nlistf == NULL && memf == NULL)
    195 		(void)setgid(getgid());
    196 
    197 	(void)time(&now);
    198 	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
    199 		err(1, "%s", _PATH_UTMP);
    200 
    201 	if (*argv)
    202 		sel_user = *argv;
    203 
    204 	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
    205 		if (utmp.ut_name[0] == '\0')
    206 			continue;
    207 		++nusers;
    208 		if (wcmd == 0 || (sel_user &&
    209 		    strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
    210 			continue;
    211 		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
    212 			err(1, NULL);
    213 		*nextp = ep;
    214 		nextp = &(ep->next);
    215 		memmove(&(ep->utmp), &utmp, sizeof(struct utmp));
    216 		if (!(stp = ttystat(ep->utmp.ut_line)))
    217 			continue;
    218 		ep->tdev = stp->st_rdev;
    219 #ifdef CPU_CONSDEV
    220 		/*
    221 		 * If this is the console device, attempt to ascertain
    222 		 * the true console device dev_t.
    223 		 */
    224 		if (ep->tdev == 0) {
    225 			int mib[2];
    226 			size_t size;
    227 
    228 			mib[0] = CTL_MACHDEP;
    229 			mib[1] = CPU_CONSDEV;
    230 			size = sizeof(dev_t);
    231 			(void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
    232 		}
    233 #endif
    234 		if ((ep->idle = now - stp->st_atime) < 0)
    235 			ep->idle = 0;
    236 	}
    237 	(void)fclose(ut);
    238 
    239 	if (header || wcmd == 0) {
    240 		pr_header(&now, nusers);
    241 		if (wcmd == 0)
    242 			exit (0);
    243 	}
    244 
    245 #define HEADER	"USER    TTY FROM              LOGIN@  IDLE WHAT\n"
    246 #define WUSED	(sizeof (HEADER) - sizeof ("WHAT\n"))
    247 	(void)printf(HEADER);
    248 
    249 	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
    250 		errx(1, "%s", kvm_geterr(kd));
    251 	for (i = 0; i < nentries; i++, kp++) {
    252 		struct proc *p = &kp->kp_proc;
    253 		struct eproc *e;
    254 
    255 		if (p->p_stat == SIDL || p->p_stat == SZOMB)
    256 			continue;
    257 		e = &kp->kp_eproc;
    258 		for (ep = ehead; ep != NULL; ep = ep->next) {
    259 			if (ep->tdev == e->e_tdev && e->e_pgid == e->e_tpgid) {
    260 				/*
    261 				 * Proc is in foreground of this terminal
    262 				 */
    263 				if (proc_compare(&ep->kp->kp_proc, p))
    264 					ep->kp = kp;
    265 				break;
    266 			}
    267 		}
    268 	}
    269 	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
    270 	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
    271 	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
    272 	       ttywidth = 79;
    273         else
    274 	       ttywidth = ws.ws_col - 1;
    275 	argwidth = ttywidth - WUSED;
    276 	if (argwidth < 4)
    277 		argwidth = 8;
    278 	/* sort by idle time */
    279 	if (sortidle && ehead != NULL) {
    280 		struct entry *from = ehead, *save;
    281 
    282 		ehead = NULL;
    283 		while (from != NULL) {
    284 			for (nextp = &ehead;
    285 			    (*nextp) && from->idle >= (*nextp)->idle;
    286 			    nextp = &(*nextp)->next)
    287 				continue;
    288 			save = from;
    289 			from = from->next;
    290 			save->next = *nextp;
    291 			*nextp = save;
    292 		}
    293 	}
    294 
    295 	if (!nflag) {
    296 		int	rv;
    297 
    298 		rv = gethostname(domain, sizeof(domain));
    299 		domain[sizeof(domain) - 1] = '\0';
    300 		if (rv < 0 || (p = strchr(domain, '.')) == 0)
    301 			domain[0] = '\0';
    302 		else
    303 			memmove(domain, p, strlen(p) + 1);
    304 	}
    305 
    306 	for (ep = ehead; ep != NULL; ep = ep->next) {
    307 		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
    308 		for (x = p; x < p + UT_HOSTSIZE; x++)
    309 			if (*x == '\0' || *x == ':')
    310 				break;
    311 		if (x == p + UT_HOSTSIZE || *x != ':')
    312 			x = NULL;
    313 		else
    314 			*x++ = '\0';
    315 
    316 		if (!nflag && inet_aton(p, &l) &&
    317 		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
    318 			if (domain[0] != '\0') {
    319 				p = hp->h_name;
    320 				p += strlen(hp->h_name);
    321 				p -= strlen(domain);
    322 				if (p > hp->h_name && strcmp(p, domain) == 0)
    323 					*p = '\0';
    324 			}
    325 			p = hp->h_name;
    326 		}
    327 		if (x) {
    328 			(void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
    329 			    (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x);
    330 			p = buf;
    331 		}
    332 		(void)printf("%-*.*s %-2.2s %-*.*s ",
    333 		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
    334 		    (strncmp(ep->utmp.ut_line, "tty", 3) &&
    335 		    strncmp(ep->utmp.ut_line, "dty", 3)) ?
    336 		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
    337 		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
    338 		pr_attime(&ep->utmp.ut_time, &now);
    339 		pr_idle(ep->idle);
    340 		pr_args(ep->kp);
    341 		printf("\n");
    342 	}
    343 	exit(0);
    344 }
    345 
    346 static void
    347 pr_args(kp)
    348 	struct kinfo_proc *kp;
    349 {
    350 	char **argv;
    351 	int left;
    352 
    353 	if (kp == 0)
    354 		goto nothing;
    355 	left = argwidth;
    356 	argv = kvm_getargv(kd, kp, argwidth);
    357 	if (argv == 0)
    358 		goto nothing;
    359 	while (*argv) {
    360 		fmt_puts(*argv, &left);
    361 		argv++;
    362 		fmt_putc(' ', &left);
    363 	}
    364 	return;
    365 nothing:
    366 	putchar('-');
    367 }
    368 
    369 static void
    370 pr_header(nowp, nusers)
    371 	time_t *nowp;
    372 	int nusers;
    373 {
    374 	double avenrun[3];
    375 	time_t uptime;
    376 	int days, hrs, i, mins;
    377 	int mib[2];
    378 	size_t size;
    379 	char buf[256];
    380 
    381 	/*
    382 	 * Print time of day.
    383 	 *
    384 	 * SCCS forces the string manipulation below, as it replaces
    385 	 * %, M, and % in a character string with the file name.
    386 	 */
    387 	(void)strftime(buf, sizeof(buf),
    388 	    __CONCAT("%l:%","M%p"), localtime(nowp));
    389 	buf[sizeof(buf) - 1] = '\0';
    390 	(void)printf("%s ", buf);
    391 
    392 	/*
    393 	 * Print how long system has been up.
    394 	 * (Found by looking getting "boottime" from the kernel)
    395 	 */
    396 	mib[0] = CTL_KERN;
    397 	mib[1] = KERN_BOOTTIME;
    398 	size = sizeof(boottime);
    399 	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
    400 	    boottime.tv_sec != 0) {
    401 		uptime = now - boottime.tv_sec;
    402 		uptime += 30;
    403 		if (uptime > SECSPERMIN) {
    404 			days = uptime / SECSPERDAY;
    405 			uptime %= SECSPERDAY;
    406 			hrs = uptime / SECSPERHOUR;
    407 			uptime %= SECSPERHOUR;
    408 			mins = uptime / SECSPERMIN;
    409 			(void)printf(" up");
    410 			if (days > 0)
    411 				(void)printf(" %d day%s,", days,
    412 				    days > 1 ? "s" : "");
    413 			if (hrs > 0 && mins > 0)
    414 				(void)printf(" %2d:%02d,", hrs, mins);
    415 			else {
    416 				if (hrs > 0)
    417 					(void)printf(" %d hr%s,",
    418 					    hrs, hrs > 1 ? "s" : "");
    419 				if (mins > 0)
    420 					(void)printf(" %d min%s,",
    421 					    mins, mins > 1 ? "s" : "");
    422 			}
    423 		}
    424 	}
    425 
    426 	/* Print number of users logged in to system */
    427 	(void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");
    428 
    429 	/*
    430 	 * Print 1, 5, and 15 minute load averages.
    431 	 */
    432 	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
    433 		(void)printf(", no load average information available\n");
    434 	else {
    435 		(void)printf(", load averages:");
    436 		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
    437 			if (i > 0)
    438 				(void)printf(",");
    439 			(void)printf(" %.2f", avenrun[i]);
    440 		}
    441 		(void)printf("\n");
    442 	}
    443 }
    444 
    445 static struct stat *
    446 ttystat(line)
    447 	char *line;
    448 {
    449 	static struct stat sb;
    450 	char ttybuf[MAXPATHLEN];
    451 
    452 	(void)snprintf(ttybuf, sizeof(ttybuf), "%s/%s", _PATH_DEV, line);
    453 	if (stat(ttybuf, &sb))
    454 		return (NULL);
    455 	return (&sb);
    456 }
    457 
    458 static void
    459 usage(wcmd)
    460 	int wcmd;
    461 {
    462 	if (wcmd)
    463 		(void)fprintf(stderr,
    464 		    "usage: w: [-hin] [-M core] [-N system] [user]\n");
    465 	else
    466 		(void)fprintf(stderr, "uptime\n");
    467 	exit(1);
    468 }
    469