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w.c revision 1.21 
      1 /*	$NetBSD: w.c,v 1.21 1997/03/29 23:21:37 christos 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 #ifndef lint
     37 static char copyright[] =
     38 "@(#) 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 static char rcsid[] = "$NetBSD: w.c,v 1.21 1997/03/29 23:21:37 christos 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 #include <sys/tty.h>
     65 
     66 #include <machine/cpu.h>
     67 #include <netinet/in.h>
     68 #include <arpa/inet.h>
     69 
     70 #include <ctype.h>
     71 #include <err.h>
     72 #include <errno.h>
     73 #include <fcntl.h>
     74 #include <kvm.h>
     75 #include <limits.h>
     76 #include <netdb.h>
     77 #include <nlist.h>
     78 #include <paths.h>
     79 #include <stdio.h>
     80 #include <stdlib.h>
     81 #include <string.h>
     82 #include <tzfile.h>
     83 #include <unistd.h>
     84 #include <utmp.h>
     85 #include <vis.h>
     86 
     87 #include "extern.h"
     88 
     89 struct timeval	boottime;
     90 struct utmp	utmp;
     91 struct winsize	ws;
     92 kvm_t	       *kd;
     93 time_t		now;		/* the current time of day */
     94 time_t		uptime;		/* time of last reboot & elapsed time since */
     95 int		ttywidth;	/* width of tty */
     96 int		argwidth;	/* width of tty */
     97 int		header = 1;	/* true if -h flag: don't print heading */
     98 int		nflag;		/* true if -n flag: don't convert addrs */
     99 int		sortidle;	/* sort bu idle time */
    100 char	       *sel_user;	/* login of particular user selected */
    101 char		domain[MAXHOSTNAMELEN];
    102 
    103 /*
    104  * One of these per active utmp entry.
    105  */
    106 struct	entry {
    107 	struct	entry *next;
    108 	struct	utmp utmp;
    109 	dev_t	tdev;		/* dev_t of terminal */
    110 	time_t	idle;		/* idle time of terminal in seconds */
    111 	struct	kinfo_proc *kp;	/* `most interesting' proc */
    112 } *ep, *ehead = NULL, **nextp = &ehead;
    113 
    114 static void	 pr_args __P((struct kinfo_proc *));
    115 static void	 pr_header __P((time_t *, int));
    116 static struct stat
    117 		*ttystat __P((char *));
    118 static void	 usage __P((int));
    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 	u_long l;
    131 	int ch, i, nentries, nusers, wcmd;
    132 	char *memf, *nlistf, *p, *x;
    133 	char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
    134 
    135 	/* Are we w(1) or uptime(1)? */
    136 	p = __progname;
    137 	if (*p == '-')
    138 		p++;
    139 	if (*p == 'u') {
    140 		wcmd = 0;
    141 		p = "";
    142 	} else {
    143 		wcmd = 1;
    144 		p = "hiflM:N:nsuw";
    145 	}
    146 
    147 	memf = nlistf = NULL;
    148 	while ((ch = getopt(argc, argv, p)) != EOF)
    149 		switch (ch) {
    150 		case 'h':
    151 			header = 0;
    152 			break;
    153 		case 'i':
    154 			sortidle = 1;
    155 			break;
    156 		case 'M':
    157 			header = 0;
    158 			memf = optarg;
    159 			break;
    160 		case 'N':
    161 			nlistf = optarg;
    162 			break;
    163 		case 'n':
    164 			nflag = 1;
    165 			break;
    166 		case 'f': case 'l': case 's': case 'u': case 'w':
    167 			warnx("[-flsuw] no longer supported");
    168 			/* FALLTHROUGH */
    169 		case '?':
    170 		default:
    171 			usage(wcmd);
    172 		}
    173 	argc -= optind;
    174 	argv += optind;
    175 
    176 	/*
    177 	 * Discard setgid privelidges if not the running kernel so that
    178 	 * bad guys can't print interesting stuff from kernel memory.
    179 	 */
    180 	if (nlistf != NULL || memf != NULL)
    181 		setgid(getgid());
    182 
    183 	if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
    184 		errx(1, "%s", errbuf);
    185 
    186 	(void)time(&now);
    187 	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
    188 		err(1, "%s", _PATH_UTMP);
    189 
    190 	if (*argv)
    191 		sel_user = *argv;
    192 
    193 	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
    194 		if (utmp.ut_name[0] == '\0')
    195 			continue;
    196 		++nusers;
    197 		if (wcmd == 0 || (sel_user &&
    198 		    strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
    199 			continue;
    200 		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
    201 			err(1, NULL);
    202 		*nextp = ep;
    203 		nextp = &(ep->next);
    204 		memmove(&(ep->utmp), &utmp, sizeof(struct utmp));
    205 		if (!(stp = ttystat(ep->utmp.ut_line)))
    206 			continue;
    207 		ep->tdev = stp->st_rdev;
    208 #ifdef CPU_CONSDEV
    209 		/*
    210 		 * If this is the console device, attempt to ascertain
    211 		 * the true console device dev_t.
    212 		 */
    213 		if (ep->tdev == 0) {
    214 			int mib[2];
    215 			size_t size;
    216 
    217 			mib[0] = CTL_MACHDEP;
    218 			mib[1] = CPU_CONSDEV;
    219 			size = sizeof(dev_t);
    220 			(void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
    221 		}
    222 #endif
    223 		if ((ep->idle = now - stp->st_atime) < 0)
    224 			ep->idle = 0;
    225 	}
    226 	(void)fclose(ut);
    227 
    228 	if (header || wcmd == 0) {
    229 		pr_header(&now, nusers);
    230 		if (wcmd == 0)
    231 			exit (0);
    232 	}
    233 
    234 #define HEADER	"USER    TTY FROM              LOGIN@  IDLE WHAT\n"
    235 #define WUSED	(sizeof (HEADER) - sizeof ("WHAT\n"))
    236 	(void)printf(HEADER);
    237 
    238 	if ((kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nentries)) == NULL)
    239 		errx(1, "%s", kvm_geterr(kd));
    240 	for (i = 0; i < nentries; i++, kp++) {
    241 		struct proc *p = &kp->kp_proc;
    242 		struct eproc *e;
    243 
    244 		if (p->p_stat == SIDL || p->p_stat == SZOMB)
    245 			continue;
    246 		e = &kp->kp_eproc;
    247 		for (ep = ehead; ep != NULL; ep = ep->next) {
    248 			if (ep->tdev == e->e_tdev && e->e_pgid == e->e_tpgid) {
    249 				/*
    250 				 * Proc is in foreground of this terminal
    251 				 */
    252 				if (proc_compare(&ep->kp->kp_proc, p))
    253 					ep->kp = kp;
    254 				break;
    255 			}
    256 		}
    257 	}
    258 	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
    259 	     ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
    260 	     ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
    261 	       ttywidth = 79;
    262         else
    263 	       ttywidth = ws.ws_col - 1;
    264 	argwidth = ttywidth - WUSED;
    265 	if (argwidth < 4)
    266 		argwidth = 8;
    267 	/* sort by idle time */
    268 	if (sortidle && ehead != NULL) {
    269 		struct entry *from = ehead, *save;
    270 
    271 		ehead = NULL;
    272 		while (from != NULL) {
    273 			for (nextp = &ehead;
    274 			    (*nextp) && from->idle >= (*nextp)->idle;
    275 			    nextp = &(*nextp)->next)
    276 				continue;
    277 			save = from;
    278 			from = from->next;
    279 			save->next = *nextp;
    280 			*nextp = save;
    281 		}
    282 	}
    283 
    284 	if (!nflag)
    285 		if (gethostname(domain, sizeof(domain) - 1) < 0 ||
    286 		    (p = strchr(domain, '.')) == 0)
    287 			domain[0] = '\0';
    288 		else {
    289 			domain[sizeof(domain) - 1] = '\0';
    290 			memmove(domain, p, strlen(p) + 1);
    291 		}
    292 
    293 	for (ep = ehead; ep != NULL; ep = ep->next) {
    294 		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
    295 		for (x = p; x < p + UT_HOSTSIZE; x++)
    296 			if (*x == ':') {
    297 				*x = '\0';
    298 				break;
    299 			}
    300 		if (x == p + UT_HOSTSIZE)
    301 			x = NULL;
    302 		if (!nflag && isdigit(*p) &&
    303 		    (long)(l = inet_addr(p)) != -1 &&
    304 		    (hp = gethostbyaddr((char *)&l, sizeof(l), AF_INET))) {
    305 			if (domain[0] != '\0') {
    306 				p = hp->h_name;
    307 				p += strlen(hp->h_name);
    308 				p -= strlen(domain);
    309 				if (p > hp->h_name && strcmp(p, domain) == 0)
    310 					*p = '\0';
    311 			}
    312 			p = hp->h_name;
    313 		}
    314 		if (x) {
    315 			(void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
    316 			    ep->utmp.ut_host + UT_HOSTSIZE - x, x);
    317 			p = buf;
    318 		}
    319 		(void)printf("%-*.*s %-2.2s %-*.*s ",
    320 		    UT_NAMESIZE, UT_NAMESIZE, ep->utmp.ut_name,
    321 		    strncmp(ep->utmp.ut_line, "tty", 3) ?
    322 		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
    323 		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
    324 		pr_attime(&ep->utmp.ut_time, &now);
    325 		pr_idle(ep->idle);
    326 		pr_args(ep->kp);
    327 		printf("\n");
    328 	}
    329 	exit(0);
    330 }
    331 
    332 static void
    333 pr_args(kp)
    334 	struct kinfo_proc *kp;
    335 {
    336 	char **argv;
    337 	int left;
    338 
    339 	if (kp == 0)
    340 		goto nothing;
    341 	left = argwidth;
    342 	argv = kvm_getargv(kd, kp, argwidth);
    343 	if (argv == 0)
    344 		goto nothing;
    345 	while (*argv) {
    346 		fmt_puts(*argv, &left);
    347 		argv++;
    348 		fmt_putc(' ', &left);
    349 	}
    350 	return;
    351 nothing:
    352 	putchar('-');
    353 }
    354 
    355 static void
    356 pr_header(nowp, nusers)
    357 	time_t *nowp;
    358 	int nusers;
    359 {
    360 	double avenrun[3];
    361 	time_t uptime;
    362 	int days, hrs, i, mins;
    363 	int mib[2];
    364 	size_t size;
    365 	char buf[256];
    366 
    367 	/*
    368 	 * Print time of day.
    369 	 *
    370 	 * SCCS forces the string manipulation below, as it replaces
    371 	 * %, M, and % in a character string with the file name.
    372 	 */
    373 	(void)strftime(buf, sizeof(buf),
    374 	    __CONCAT("%l:%","M%p"), localtime(nowp));
    375 	(void)printf("%s ", buf);
    376 
    377 	/*
    378 	 * Print how long system has been up.
    379 	 * (Found by looking getting "boottime" from the kernel)
    380 	 */
    381 	mib[0] = CTL_KERN;
    382 	mib[1] = KERN_BOOTTIME;
    383 	size = sizeof(boottime);
    384 	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
    385 	    boottime.tv_sec != 0) {
    386 		uptime = now - boottime.tv_sec;
    387 		uptime += 30;
    388 		days = uptime / SECSPERDAY;
    389 		uptime %= SECSPERDAY;
    390 		hrs = uptime / SECSPERHOUR;
    391 		uptime %= SECSPERHOUR;
    392 		mins = uptime / SECSPERMIN;
    393 		(void)printf(" up");
    394 		if (days > 0)
    395 			(void)printf(" %d day%s,", days, days > 1 ? "s" : "");
    396 		if (hrs > 0 && mins > 0)
    397 			(void)printf(" %2d:%02d,", hrs, mins);
    398 		else {
    399 			if (hrs > 0)
    400 				(void)printf(" %d hr%s,",
    401 				    hrs, hrs > 1 ? "s" : "");
    402 			if (mins > 0)
    403 				(void)printf(" %d min%s,",
    404 				    mins, mins > 1 ? "s" : "");
    405 		}
    406 	}
    407 
    408 	/* Print number of users logged in to system */
    409 	(void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");
    410 
    411 	/*
    412 	 * Print 1, 5, and 15 minute load averages.
    413 	 */
    414 	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
    415 		(void)printf(", no load average information available\n");
    416 	else {
    417 		(void)printf(", load averages:");
    418 		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
    419 			if (i > 0)
    420 				(void)printf(",");
    421 			(void)printf(" %.2f", avenrun[i]);
    422 		}
    423 		(void)printf("\n");
    424 	}
    425 }
    426 
    427 static struct stat *
    428 ttystat(line)
    429 	char *line;
    430 {
    431 	static struct stat sb;
    432 	char ttybuf[MAXPATHLEN];
    433 
    434 	(void)snprintf(ttybuf, sizeof(ttybuf), "%s/%s", _PATH_DEV, line);
    435 	if (stat(ttybuf, &sb))
    436 		return (NULL);
    437 	return (&sb);
    438 }
    439 
    440 static void
    441 usage(wcmd)
    442 	int wcmd;
    443 {
    444 	if (wcmd)
    445 		(void)fprintf(stderr,
    446 		    "usage: w: [-hin] [-M core] [-N system] [user]\n");
    447 	else
    448 		(void)fprintf(stderr, "uptime\n");
    449 	exit (1);
    450 }
    451