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w.c revision 1.46 
      1 /*	$NetBSD: w.c,v 1.46 2001/02/19 23:03:52 cgd 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 1.46 2001/02/19 23:03:52 cgd 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/types.h>
     58 #include <sys/time.h>
     59 #include <sys/stat.h>
     60 #include <sys/sysctl.h>
     61 #include <sys/proc.h>
     62 #include <sys/user.h>
     63 #include <sys/ioctl.h>
     64 #include <sys/socket.h>
     65 
     66 #include <netinet/in.h>
     67 #include <arpa/inet.h>
     68 
     69 #include <ctype.h>
     70 #include <err.h>
     71 #include <errno.h>
     72 #include <fcntl.h>
     73 #include <kvm.h>
     74 #include <limits.h>
     75 #include <netdb.h>
     76 #include <nlist.h>
     77 #include <paths.h>
     78 #include <stdio.h>
     79 #include <stdlib.h>
     80 #include <string.h>
     81 #include <time.h>
     82 #include <tzfile.h>
     83 #include <unistd.h>
     84 #include <utmp.h>
     85 #include <vis.h>
     86 
     87 #include "extern.h"
     88 
     89 #define	max(a,b)	(((a)>(b))?(a):(b))
     90 
     91 struct timeval	boottime;
     92 struct utmp	utmp;
     93 struct winsize	ws;
     94 kvm_t	       *kd;
     95 time_t		now;		/* the current time of day */
     96 time_t		uptime;		/* time of last reboot & elapsed time since */
     97 int		ttywidth;	/* width of tty */
     98 int		argwidth;	/* width of tty left to print process args */
     99 int		header = 1;	/* true if -h flag: don't print heading */
    100 int		nflag;		/* true if -n flag: don't convert addrs */
    101 int		sortidle;	/* sort bu idle time */
    102 char	       *sel_user;	/* login of particular user selected */
    103 char		domain[MAXHOSTNAMELEN + 1];
    104 
    105 /*
    106  * One of these per active utmp entry.
    107  */
    108 struct	entry {
    109 	struct	entry *next;
    110 	struct	utmp utmp;
    111 	dev_t	tdev;			/* dev_t of terminal */
    112 	time_t	idle;			/* idle time of terminal in seconds */
    113 	struct	kinfo_proc2 *kp;	/* `most interesting' proc */
    114 #ifdef SUPPORT_FTPD_UTMP
    115 	pid_t	ftpd_pid;		/* pid as extracted from ftpd's entry */
    116 #endif
    117 } *ep, *ehead = NULL, **nextp = &ehead;
    118 
    119 static void	 pr_args(struct kinfo_proc2 *);
    120 static void	 pr_header(time_t *, int);
    121 static struct stat *ttystat(char *, size_t);
    122 static void	 usage(int);
    123 int	main(int, char **);
    124 
    125 int
    126 main(int argc, char **argv)
    127 {
    128 	struct kinfo_proc2 *kp;
    129 	struct hostent *hp;
    130 	struct stat *stp;
    131 	FILE *ut;
    132 	struct in_addr l;
    133 	time_t touched;
    134 	int ch, i, nentries, nusers, wcmd, lognamelen;
    135 	char *memf, *nlistf, *p, *x;
    136 	const char *progname;
    137 	char buf[MAXHOSTNAMELEN], errbuf[_POSIX2_LINE_MAX];
    138 
    139 	/* Are we w(1) or uptime(1)? */
    140 	progname = getprogname();
    141 	if (*progname == '-')
    142 		progname++;
    143 	if (*progname == 'u') {
    144 		wcmd = 0;
    145 		p = "";
    146 	} else {
    147 		wcmd = 1;
    148 		p = "hiflM:N:nsuw";
    149 	}
    150 
    151 	memf = nlistf = NULL;
    152 	while ((ch = getopt(argc, argv, p)) != -1)
    153 		switch (ch) {
    154 		case 'h':
    155 			header = 0;
    156 			break;
    157 		case 'i':
    158 			sortidle = 1;
    159 			break;
    160 		case 'M':
    161 			header = 0;
    162 			memf = optarg;
    163 			break;
    164 		case 'N':
    165 			nlistf = optarg;
    166 			break;
    167 		case 'n':
    168 			nflag = 1;
    169 			break;
    170 		case 'f': case 'l': case 's': case 'u': case 'w':
    171 			warnx("[-flsuw] no longer supported");
    172 			/* FALLTHROUGH */
    173 		case '?':
    174 		default:
    175 			usage(wcmd);
    176 		}
    177 	argc -= optind;
    178 	argv += optind;
    179 
    180 	if ((kd = kvm_openfiles(nlistf, memf, NULL,
    181 	    memf == NULL ? KVM_NO_FILES : O_RDONLY, errbuf)) == NULL)
    182 		errx(1, "%s", errbuf);
    183 
    184 	(void)time(&now);
    185 	if ((ut = fopen(_PATH_UTMP, "r")) == NULL && wcmd)
    186 		err(1, "%s", _PATH_UTMP);
    187 
    188 	if (*argv)
    189 		sel_user = *argv;
    190 
    191 	for (nusers = 0; ut && fread(&utmp, sizeof(utmp), 1, ut);) {
    192 		if (utmp.ut_name[0] == '\0')
    193 			continue;
    194 		++nusers;
    195 		if (wcmd == 0 || (sel_user &&
    196 		    strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
    197 			continue;
    198 		if ((ep = calloc(1, sizeof(struct entry))) == NULL)
    199 			err(1, NULL);
    200 		*nextp = ep;
    201 		nextp = &(ep->next);
    202 		memmove(&(ep->utmp), &utmp, sizeof(struct utmp));
    203 		if (!(stp = ttystat(ep->utmp.ut_line, UT_LINESIZE))) {
    204 #ifdef SUPPORT_FTPD_UTMP
    205 			/*
    206 			 * Hack to recognize and correctly parse
    207 			 * utmp entry made by ftpd. The "tty" used
    208 			 * by ftpd is not a real tty, just identifier in
    209 			 * form ftpPROCESS_ID. Pid parsed from the "tty name"
    210 			 * is used later to match corresponding process.
    211 			 */
    212 			if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0)
    213 				ep->ftpd_pid =
    214 					strtol(ep->utmp.ut_line + 3, NULL, 10);
    215 #endif /* SUPPORT_FTPD_UTMP */
    216 
    217 			continue;
    218 		}
    219 		ep->tdev = stp->st_rdev;
    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_KERN;
    229 			mib[1] = KERN_CONSDEV;
    230 			size = sizeof(dev_t);
    231 			(void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
    232 		}
    233 
    234 		touched = stp->st_atime;
    235 		if (touched < ep->utmp.ut_time) {
    236 				/* tty untouched since before login */
    237 				touched = ep->utmp.ut_time;
    238 			}
    239 	if ((ep->idle = now - touched) < 0)
    240 			ep->idle = 0;
    241 	}
    242 	if (ut)
    243 		(void)fclose(ut);
    244 	else
    245 		nusers = 1;
    246 
    247 	if (header || wcmd == 0) {
    248 		pr_header(&now, nusers);
    249 		if (wcmd == 0)
    250 			exit (0);
    251 	}
    252 
    253 	if ((kp = kvm_getproc2(kd, KERN_PROC_ALL, 0,
    254 	    sizeof(struct kinfo_proc2), &nentries)) == NULL)
    255 		errx(1, "%s", kvm_geterr(kd));
    256 
    257 	/* Include trailing space because TTY header starts one column early. */
    258 	lognamelen = sizeof("USER ") - 1 /* NUL */;
    259 	for (i = 0; i < nentries; i++, kp++) {
    260 
    261 		if (kp->p_stat == SIDL || kp->p_stat == SZOMB)
    262 			continue;
    263 
    264 		for (ep = ehead; ep != NULL; ep = ep->next) {
    265 			if (ep->tdev == kp->p_tdev
    266 				&& kp->p__pgid == kp->p_tpgid) {
    267 				/*
    268 				 * Proc is in foreground of this terminal
    269 				 */
    270 				if (proc_compare(ep->kp, kp)) {
    271 					ep->kp = kp;
    272 					lognamelen = max(lognamelen,
    273 					    strlen(kp->p_login));
    274 				}
    275 				break;
    276 			}
    277 #ifdef SUPPORT_FTPD_UTMP
    278 			/*
    279 			 * Hack to match process to ftp utmp entry.
    280 			 */
    281 			else if (ep->tdev == 0 && kp->p_tdev == NODEV
    282 				 && ep->ftpd_pid == kp->p_pid) {
    283 				ep->kp = kp;
    284 				lognamelen = max(lognamelen,
    285 					    strlen(kp->p_login));
    286 			}
    287 #endif /* SUPPORT_FTPD_UTMP */
    288 		}
    289 	}
    290 
    291 	argwidth = printf("%-*sTTY %-*s %*s  IDLE WHAT\n",
    292 	    lognamelen, "USER", UT_HOSTSIZE, "FROM",
    293 	    7 /* "dddhhXm" */, "LOGIN@");
    294 	argwidth -= sizeof("WHAT\n") - 1 /* NUL */;
    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 - argwidth;
    303 	if (argwidth < 4)
    304 		argwidth = 8;
    305 	/* sort by idle time */
    306 	if (sortidle && ehead != NULL) {
    307 		struct entry *from = ehead, *save;
    308 
    309 		ehead = NULL;
    310 		while (from != NULL) {
    311 			for (nextp = &ehead;
    312 			    (*nextp) && from->idle >= (*nextp)->idle;
    313 			    nextp = &(*nextp)->next)
    314 				continue;
    315 			save = from;
    316 			from = from->next;
    317 			save->next = *nextp;
    318 			*nextp = save;
    319 		}
    320 	}
    321 
    322 	if (!nflag) {
    323 		int	rv;
    324 
    325 		rv = gethostname(domain, sizeof(domain));
    326 		domain[sizeof(domain) - 1] = '\0';
    327 		if (rv < 0 || (p = strchr(domain, '.')) == 0)
    328 			domain[0] = '\0';
    329 		else
    330 			memmove(domain, p, strlen(p) + 1);
    331 	}
    332 
    333 	for (ep = ehead; ep != NULL; ep = ep->next) {
    334 		char host_buf[UT_HOSTSIZE + 1];
    335 
    336 		host_buf[UT_HOSTSIZE] = '\0';
    337 		strncpy(host_buf, ep->utmp.ut_host, UT_HOSTSIZE);
    338 		p = *host_buf ? host_buf : "-";
    339 
    340 		for (x = p; x < p + UT_HOSTSIZE; x++)
    341 			if (*x == '\0' || *x == ':')
    342 				break;
    343 		if (x == p + UT_HOSTSIZE || *x != ':')
    344 			x = NULL;
    345 		else
    346 			*x++ = '\0';
    347 
    348 		if (!nflag && inet_aton(p, &l) &&
    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 && strcasecmp(p, domain) == 0)
    355 					*p = '\0';
    356 			}
    357 			p = hp->h_name;
    358 		}
    359 		if (x) {
    360 			(void)snprintf(buf, sizeof(buf), "%s:%s", p, x);
    361 			p = buf;
    362 		}
    363 		if (ep->kp == NULL) {
    364 		    warnx("Stale utmp entry: %.*s %.*s %.*s",
    365 			UT_NAMESIZE, ep->utmp.ut_name,
    366 			UT_LINESIZE, ep->utmp.ut_line,
    367 			UT_HOSTSIZE, ep->utmp.ut_host);
    368 		    continue;
    369 		}
    370 		(void)printf("%-*s %-2.2s %-*.*s ",
    371 		    lognamelen, ep->kp->p_login,
    372 		    (strncmp(ep->utmp.ut_line, "tty", 3) &&
    373 		    strncmp(ep->utmp.ut_line, "dty", 3)) ?
    374 		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
    375 		    UT_HOSTSIZE, UT_HOSTSIZE, *p ? p : "-");
    376 		pr_attime(&ep->utmp.ut_time, &now);
    377 		pr_idle(ep->idle);
    378 		pr_args(ep->kp);
    379 		(void)printf("\n");
    380 	}
    381 	exit(0);
    382 }
    383 
    384 static void
    385 pr_args(struct kinfo_proc2 *kp)
    386 {
    387 	char **argv;
    388 	int left;
    389 
    390 	if (kp == 0)
    391 		goto nothing;
    392 	left = argwidth;
    393 	argv = kvm_getargv2(kd, kp, argwidth);
    394 	if (argv == 0)
    395 		goto nothing;
    396 	while (*argv) {
    397 		fmt_puts(*argv, &left);
    398 		argv++;
    399 		fmt_putc(' ', &left);
    400 	}
    401 	return;
    402 nothing:
    403 	putchar('-');
    404 }
    405 
    406 static void
    407 pr_header(time_t *nowp, int nusers)
    408 {
    409 	double avenrun[3];
    410 	time_t uptime;
    411 	int days, hrs, i, mins;
    412 	int mib[2];
    413 	size_t size;
    414 	char buf[256];
    415 
    416 	/*
    417 	 * Print time of day.
    418 	 *
    419 	 * SCCS forces the string manipulation below, as it replaces
    420 	 * %, M, and % in a character string with the file name.
    421 	 */
    422 	(void)strftime(buf, sizeof(buf), "%l:%" "M%p", localtime(nowp));
    423 	buf[sizeof(buf) - 1] = '\0';
    424 	(void)printf("%s ", buf);
    425 
    426 	/*
    427 	 * Print how long system has been up.
    428 	 * (Found by looking getting "boottime" from the kernel)
    429 	 */
    430 	mib[0] = CTL_KERN;
    431 	mib[1] = KERN_BOOTTIME;
    432 	size = sizeof(boottime);
    433 	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1 &&
    434 	    boottime.tv_sec != 0) {
    435 		uptime = now - boottime.tv_sec;
    436 		uptime += 30;
    437 		if (uptime > SECSPERMIN) {
    438 			days = uptime / SECSPERDAY;
    439 			uptime %= SECSPERDAY;
    440 			hrs = uptime / SECSPERHOUR;
    441 			uptime %= SECSPERHOUR;
    442 			mins = uptime / SECSPERMIN;
    443 			(void)printf(" up");
    444 			if (days > 0)
    445 				(void)printf(" %d day%s,", days,
    446 				    days > 1 ? "s" : "");
    447 			if (hrs > 0 && mins > 0)
    448 				(void)printf(" %2d:%02d,", hrs, mins);
    449 			else {
    450 				if (hrs > 0)
    451 					(void)printf(" %d hr%s,",
    452 					    hrs, hrs > 1 ? "s" : "");
    453 				if (mins > 0)
    454 					(void)printf(" %d min%s,",
    455 					    mins, mins > 1 ? "s" : "");
    456 			}
    457 		}
    458 	}
    459 
    460 	/* Print number of users logged in to system */
    461 	(void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");
    462 
    463 	/*
    464 	 * Print 1, 5, and 15 minute load averages.
    465 	 */
    466 	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
    467 		(void)printf(", no load average information available\n");
    468 	else {
    469 		(void)printf(", load averages:");
    470 		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
    471 			if (i > 0)
    472 				(void)printf(",");
    473 			(void)printf(" %.2f", avenrun[i]);
    474 		}
    475 		(void)printf("\n");
    476 	}
    477 }
    478 
    479 static struct stat *
    480 ttystat(char *line, size_t sz)
    481 {
    482 	static struct stat sb;
    483 	char ttybuf[MAXPATHLEN];
    484 
    485 	(void)snprintf(ttybuf, sizeof(ttybuf), "%s%.*s", _PATH_DEV, (int) sz, line);
    486 	if (stat(ttybuf, &sb))
    487 		return (NULL);
    488 	return (&sb);
    489 }
    490 
    491 static void
    492 usage(int wcmd)
    493 {
    494 	if (wcmd)
    495 		(void)fprintf(stderr,
    496 		    "usage: w: [-hin] [-M core] [-N system] [user]\n");
    497 	else
    498 		(void)fprintf(stderr, "uptime\n");
    499 	exit(1);
    500 }
    501