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who.c revision 1.20.2.1 
      1 /*	$NetBSD: who.c,v 1.20.2.1 2008/11/28 06:30:55 snj Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1989, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * This code is derived from software contributed to Berkeley by
      8  * Michael Fischbein.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  */
     34 
     35 #include <sys/cdefs.h>
     36 #ifndef lint
     37 __COPYRIGHT(
     38 "@(#) Copyright (c) 1989, 1993\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[] = "@(#)who.c	8.1 (Berkeley) 6/6/93";
     45 #endif
     46 __RCSID("$NetBSD: who.c,v 1.20.2.1 2008/11/28 06:30:55 snj Exp $");
     47 #endif /* not lint */
     48 
     49 #include <sys/types.h>
     50 #include <sys/stat.h>
     51 
     52 #include <err.h>
     53 #include <locale.h>
     54 #include <pwd.h>
     55 #include <stdio.h>
     56 #include <stdlib.h>
     57 #include <string.h>
     58 #include <time.h>
     59 #include <unistd.h>
     60 #ifdef SUPPORT_UTMP
     61 #include <utmp.h>
     62 #endif
     63 #ifdef SUPPORT_UTMPX
     64 #include <utmpx.h>
     65 #endif
     66 
     67 #include "utmpentry.h"
     68 
     69 static void output_labels(void);
     70 static void who_am_i(const char *, int);
     71 static void usage(void) __attribute__((__noreturn__));
     72 static void process(const char *, int);
     73 static void eprint(const struct utmpentry *);
     74 static void print(const char *, const char *, time_t, const char *, pid_t pid,
     75     uint16_t term, uint16_t xit, uint16_t sess, uint16_t type);
     76 static void quick(const char *);
     77 
     78 static int show_term;			/* show term state */
     79 static int show_idle;			/* show idle time */
     80 static int show_details;		/* show exit status etc. */
     81 
     82 struct ut_type_names {
     83   int type;
     84   const char *name;
     85 } ut_type_names[] = {
     86 #ifdef SUPPORT_UTMPX
     87   { EMPTY, "empty" },
     88   { RUN_LVL, "run level" },
     89   { BOOT_TIME, "boot time" },
     90   { OLD_TIME, "old time" },
     91   { NEW_TIME, "new time" },
     92   { INIT_PROCESS, "init process" },
     93   { LOGIN_PROCESS, "login process" },
     94   { USER_PROCESS, "user process" },
     95   { DEAD_PROCESS, "dead process" },
     96 #if defined(_NETBSD_SOURCE)
     97   { ACCOUNTING, "accounting" },
     98   { SIGNATURE, "signature" },
     99   { DOWN_TIME, "down time" },
    100 #endif /* _NETBSD_SOURCE */
    101 #endif /* SUPPORT_UTMPX */
    102   { -1, "unknown" }
    103 };
    104 
    105 int
    106 main(int argc, char *argv[])
    107 {
    108 	int c, only_current_term, show_labels, quick_mode, default_mode;
    109 	int et = 0;
    110 
    111 	setlocale(LC_ALL, "");
    112 
    113 	only_current_term = show_term = show_idle = show_labels = 0;
    114 	quick_mode = default_mode = 0;
    115 
    116 	while ((c = getopt(argc, argv, "abdHlmpqrsTtuv")) != -1) {
    117 		switch (c) {
    118 		case 'a':
    119 			et = -1;
    120 			show_idle = show_details = 1;
    121 			break;
    122 		case 'b':
    123 			et |= (1 << BOOT_TIME);
    124 			break;
    125 		case 'd':
    126 			et |= (1 << DEAD_PROCESS);
    127 			break;
    128 		case 'H':
    129 			show_labels = 1;
    130 			break;
    131 		case 'l':
    132 			et |= (1 << LOGIN_PROCESS);
    133 			break;
    134 		case 'm':
    135 			only_current_term = 1;
    136 			break;
    137 		case 'p':
    138 			et |= (1 << INIT_PROCESS);
    139 			break;
    140 		case 'q':
    141 			quick_mode = 1;
    142 			break;
    143 		case 'r':
    144 			et |= (1 << RUN_LVL);
    145 			break;
    146 		case 's':
    147 			default_mode = 1;
    148 			break;
    149 		case 'T':
    150 			show_term = 1;
    151 			break;
    152 		case 't':
    153 			et |= (1 << NEW_TIME);
    154 			break;
    155 		case 'u':
    156 			show_idle = 1;
    157 			break;
    158 		case 'v':
    159 			show_details = 1;
    160 			break;
    161 		default:
    162 			usage();
    163 			/* NOTREACHED */
    164 		}
    165 	}
    166 	argc -= optind;
    167 	argv += optind;
    168 
    169 	if (et != 0)
    170 		etype = et;
    171 
    172 	if (chdir("/dev")) {
    173 		err(EXIT_FAILURE, "cannot change directory to /dev");
    174 		/* NOTREACHED */
    175 	}
    176 
    177 	if (default_mode)
    178 		only_current_term = show_term = show_idle = 0;
    179 
    180 	switch (argc) {
    181 	case 0:					/* who */
    182 		if (quick_mode) {
    183 			quick(NULL);
    184 		} else if (only_current_term) {
    185 			who_am_i(NULL, show_labels);
    186 		} else {
    187 			process(NULL, show_labels);
    188 		}
    189 		break;
    190 	case 1:					/* who utmp_file */
    191 		if (quick_mode) {
    192 			quick(*argv);
    193 		} else if (only_current_term) {
    194 			who_am_i(*argv, show_labels);
    195 		} else {
    196 			process(*argv, show_labels);
    197 		}
    198 		break;
    199 	case 2:					/* who am i */
    200 		who_am_i(NULL, show_labels);
    201 		break;
    202 	default:
    203 		usage();
    204 		/* NOTREACHED */
    205 	}
    206 
    207 	return 0;
    208 }
    209 
    210 static char *
    211 strrstr(const char *str, const char *pat)
    212 {
    213 	const char *estr;
    214 	size_t len;
    215 	if (*pat == '\0')
    216 		return __UNCONST(str);
    217 
    218 	len = strlen(pat);
    219 
    220 	for (estr = str + strlen(str); str < estr; estr--)
    221 		if (strncmp(estr, pat, len) == 0)
    222 			return __UNCONST(estr);
    223 	return NULL;
    224 }
    225 
    226 static void
    227 who_am_i(const char *fname, int show_labels)
    228 {
    229 	struct passwd *pw;
    230 	const char *p;
    231 	char *t;
    232 	time_t now;
    233 	struct utmpentry *ehead, *ep;
    234 
    235 	/* search through the utmp and find an entry for this tty */
    236 	if ((p = ttyname(STDIN_FILENO)) != NULL) {
    237 
    238 		/* strip directory prefixes for ttys */
    239 		if ((t = strrstr(p, "/pts/")) != NULL ||
    240 		    (t = strrchr(p, '/')) != NULL)
    241 			p = t + 1;
    242 
    243 		(void)getutentries(fname, &ehead);
    244 		for (ep = ehead; ep; ep = ep->next)
    245 			if (strcmp(ep->line, p) == 0) {
    246 				if (show_labels)
    247 					output_labels();
    248 				eprint(ep);
    249 				return;
    250 			}
    251 	} else
    252 		p = "tty??";
    253 
    254 	(void)time(&now);
    255 	pw = getpwuid(getuid());
    256 	if (show_labels)
    257 		output_labels();
    258 	print(pw ? pw->pw_name : "?", p, now, "", getpid(), 0, 0, 0, 0);
    259 }
    260 
    261 static void
    262 process(const char *fname, int show_labels)
    263 {
    264 	struct utmpentry *ehead, *ep;
    265 	(void)getutentries(fname, &ehead);
    266 	if (show_labels)
    267 		output_labels();
    268 	for (ep = ehead; ep != NULL; ep = ep->next)
    269 		eprint(ep);
    270 }
    271 
    272 static void
    273 eprint(const struct utmpentry *ep)
    274 {
    275 	print(ep->name, ep->line, (time_t)ep->tv.tv_sec, ep->host, ep->pid,
    276 	    ep->term, ep->exit, ep->sess, ep->type);
    277 }
    278 
    279 static void
    280 print(const char *name, const char *line, time_t t, const char *host,
    281     pid_t pid, uint16_t term, uint16_t xit, uint16_t sess, uint16_t type)
    282 {
    283 	struct stat sb;
    284 	char state;
    285 	static time_t now = 0;
    286 	time_t idle;
    287 	const char *types = NULL;
    288 	size_t i;
    289 
    290 	state = '?';
    291 	idle = 0;
    292 
    293 	for (i = 0; ut_type_names[i].type >= 0; i++) {
    294 		types = ut_type_names[i].name;
    295 		if (ut_type_names[i].type == type)
    296 			break;
    297 	}
    298 
    299 	if (show_term || show_idle) {
    300 		if (now == 0)
    301 			time(&now);
    302 
    303 		if (stat(line, &sb) == 0) {
    304 			state = (sb.st_mode & 020) ? '+' : '-';
    305 			idle = now - sb.st_atime;
    306 		}
    307 
    308 	}
    309 
    310 	(void)printf("%-*.*s ", maxname, maxname, name);
    311 
    312 	if (show_term)
    313 		(void)printf("%c ", state);
    314 
    315 	(void)printf("%-*.*s ", maxline, maxline, line);
    316 	(void)printf("%.12s ", ctime(&t) + 4);
    317 
    318 	if (show_idle) {
    319 		if (idle < 60)
    320 			(void)printf("  .   ");
    321 		else if (idle < (24 * 60 * 60))
    322 			(void)printf("%02ld:%02ld ",
    323 				     (long)(idle / (60 * 60)),
    324 				     (long)(idle % (60 * 60)) / 60);
    325 		else
    326 			(void)printf(" old  ");
    327 
    328 		(void)printf("\t%6d", pid);
    329 
    330 		if (show_details) {
    331 			if (type == RUN_LVL)
    332 				(void)printf("\tnew=%c old=%c", term, xit);
    333 			else
    334 				(void)printf("\tterm=%d exit=%d", term, xit);
    335 			(void)printf(" sess=%d", sess);
    336 			(void)printf(" type=%s ", types);
    337 		}
    338 	}
    339 
    340 	if (*host)
    341 		(void)printf("\t(%.*s)", maxhost, host);
    342 	(void)putchar('\n');
    343 }
    344 
    345 static void
    346 output_labels(void)
    347 {
    348 	(void)printf("%-*.*s ", maxname, maxname, "USER");
    349 
    350 	if (show_term)
    351 		(void)printf("S ");
    352 
    353 	(void)printf("%-*.*s ", maxline, maxline, "LINE");
    354 	(void)printf("WHEN         ");
    355 
    356 	if (show_idle) {
    357 		(void)printf("IDLE  ");
    358 		(void)printf("\t   PID");
    359 
    360 		(void)printf("\tCOMMENT");
    361 	}
    362 
    363 	(void)putchar('\n');
    364 }
    365 
    366 static void
    367 quick(const char *fname)
    368 {
    369 	struct utmpentry *ehead, *ep;
    370 	int num = 0;
    371 
    372 	(void)getutentries(fname, &ehead);
    373 	for (ep = ehead; ep != NULL; ep = ep->next) {
    374 		(void)printf("%-*s ", maxname, ep->name);
    375 		if ((++num % 8) == 0)
    376 			(void)putchar('\n');
    377 	}
    378 	if (num % 8)
    379 		(void)putchar('\n');
    380 
    381 	(void)printf("# users = %d\n", num);
    382 }
    383 
    384 static void
    385 usage(void)
    386 {
    387 	(void)fprintf(stderr, "Usage: %s [-abdHlmqrsTtuv] [file]\n\t%s am i\n",
    388 	    getprogname(), getprogname());
    389 	exit(EXIT_FAILURE);
    390 }
    391