1/*	$NetBSD: who.c,v 1.25 2015/11/21 15:01:43 christos 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("@(#) Copyright (c) 1989, 1993\
38 The Regents of the University of California.  All rights reserved.");
39#endif /* not lint */
40
41#ifndef lint
42#if 0
43static char sccsid[] = "@(#)who.c	8.1 (Berkeley) 6/6/93";
44#endif
45__RCSID("$NetBSD: who.c,v 1.25 2015/11/21 15:01:43 christos Exp $");
46#endif /* not lint */
47
48#include <sys/types.h>
49#include <sys/stat.h>
50
51#include <err.h>
52#include <locale.h>
53#include <pwd.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <time.h>
58#include <unistd.h>
59#ifdef SUPPORT_UTMP
60#include <utmp.h>
61#endif
62#ifdef SUPPORT_UTMPX
63#include <utmpx.h>
64#endif
65
66#include "utmpentry.h"
67
68static void output_labels(void);
69static void who_am_i(const char *, int);
70static void usage(void) __dead;
71static void process(const char *, int);
72static void eprint(const struct utmpentry *);
73static void print(const char *, const char *, time_t, const char *, pid_t pid,
74    uint16_t term, uint16_t xit, uint16_t sess, uint16_t type);
75static void quick(const char *);
76
77static int show_term;			/* show term state */
78static int show_idle;			/* show idle time */
79static int show_details;		/* show exit status etc. */
80
81struct ut_type_names {
82  int type;
83  const char *name;
84} ut_type_names[] = {
85#ifdef SUPPORT_UTMPX
86  { EMPTY, "empty" },
87  { RUN_LVL, "run level" },
88  { BOOT_TIME, "boot time" },
89  { OLD_TIME, "old time" },
90  { NEW_TIME, "new time" },
91  { INIT_PROCESS, "init process" },
92  { LOGIN_PROCESS, "login process" },
93  { USER_PROCESS, "user process" },
94  { DEAD_PROCESS, "dead process" },
95#if defined(_NETBSD_SOURCE)
96  { ACCOUNTING, "accounting" },
97  { SIGNATURE, "signature" },
98  { DOWN_TIME, "down time" },
99#endif /* _NETBSD_SOURCE */
100#endif /* SUPPORT_UTMPX */
101  { -1, "unknown" }
102};
103
104int
105main(int argc, char *argv[])
106{
107	int c, only_current_term, show_labels, quick_mode, default_mode;
108	int et = 0;
109
110	setlocale(LC_ALL, "");
111
112	only_current_term = show_term = show_idle = show_labels = 0;
113	quick_mode = default_mode = 0;
114
115	while ((c = getopt(argc, argv, "abdHlmpqrsTtuv")) != -1) {
116		switch (c) {
117		case 'a':
118			et = -1;
119			show_idle = show_details = 1;
120			break;
121		case 'b':
122			et |= (1 << BOOT_TIME);
123			break;
124		case 'd':
125			et |= (1 << DEAD_PROCESS);
126			break;
127		case 'H':
128			show_labels = 1;
129			break;
130		case 'l':
131			et |= (1 << LOGIN_PROCESS);
132			break;
133		case 'm':
134			only_current_term = 1;
135			break;
136		case 'p':
137			et |= (1 << INIT_PROCESS);
138			break;
139		case 'q':
140			quick_mode = 1;
141			break;
142		case 'r':
143			et |= (1 << RUN_LVL);
144			break;
145		case 's':
146			default_mode = 1;
147			break;
148		case 'T':
149			show_term = 1;
150			break;
151		case 't':
152			et |= (1 << NEW_TIME);
153			break;
154		case 'u':
155			show_idle = 1;
156			break;
157		case 'v':
158			show_details = 1;
159			break;
160		default:
161			usage();
162			/* NOTREACHED */
163		}
164	}
165	argc -= optind;
166	argv += optind;
167
168	if (et != 0)
169		etype = et;
170
171	if (chdir("/dev")) {
172		err(EXIT_FAILURE, "cannot change directory to /dev");
173		/* NOTREACHED */
174	}
175
176	if (default_mode)
177		only_current_term = show_term = show_idle = 0;
178
179	switch (argc) {
180	case 0:					/* who */
181		if (quick_mode) {
182			quick(NULL);
183		} else if (only_current_term) {
184			who_am_i(NULL, show_labels);
185		} else {
186			process(NULL, show_labels);
187		}
188		break;
189	case 1:					/* who utmp_file */
190		if (quick_mode) {
191			quick(*argv);
192		} else if (only_current_term) {
193			who_am_i(*argv, show_labels);
194		} else {
195			process(*argv, show_labels);
196		}
197		break;
198	case 2:					/* who am i */
199		who_am_i(NULL, show_labels);
200		break;
201	default:
202		usage();
203		/* NOTREACHED */
204	}
205
206	return 0;
207}
208
209static char *
210strrstr(const char *str, const char *pat)
211{
212	const char *estr;
213	size_t len;
214	if (*pat == '\0')
215		return __UNCONST(str);
216
217	len = strlen(pat);
218
219	for (estr = str + strlen(str); str < estr; estr--)
220		if (strncmp(estr, pat, len) == 0)
221			return __UNCONST(estr);
222	return NULL;
223}
224
225static void
226who_am_i(const char *fname, int show_labels)
227{
228	struct passwd *pw;
229	const char *p;
230	char *t;
231	time_t now;
232	struct utmpentry *ehead, *ep;
233
234	/* search through the utmp and find an entry for this tty */
235	if ((p = ttyname(STDIN_FILENO)) != NULL) {
236
237		/* strip directory prefixes for ttys */
238		if ((t = strrstr(p, "/pts/")) != NULL ||
239		    (t = strrchr(p, '/')) != NULL)
240			p = t + 1;
241
242		(void)getutentries(fname, &ehead);
243		for (ep = ehead; ep; ep = ep->next)
244			if (strcmp(ep->line, p) == 0) {
245				if (show_labels)
246					output_labels();
247				eprint(ep);
248				return;
249			}
250	} else
251		p = "tty??";
252
253	(void)time(&now);
254	pw = getpwuid(getuid());
255	if (show_labels)
256		output_labels();
257	print(pw ? pw->pw_name : "?", p, now, "", getpid(), 0, 0, 0, 0);
258}
259
260static void
261process(const char *fname, int show_labels)
262{
263	struct utmpentry *ehead, *ep;
264	(void)getutentries(fname, &ehead);
265	if (show_labels)
266		output_labels();
267	for (ep = ehead; ep != NULL; ep = ep->next)
268		eprint(ep);
269}
270
271static void
272eprint(const struct utmpentry *ep)
273{
274	print(ep->name, ep->line, (time_t)ep->tv.tv_sec, ep->host, ep->pid,
275	    ep->term, ep->exit, ep->sess, ep->type);
276}
277
278static void
279print(const char *name, const char *line, time_t t, const char *host,
280    pid_t pid, uint16_t term, uint16_t xit, uint16_t sess, uint16_t type)
281{
282	struct stat sb;
283	char state;
284	static time_t now = 0;
285	time_t idle;
286	const char *types = NULL;
287	size_t i;
288	char *tstr;
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 ", (int)maxname, (int)maxname, name);
311
312	if (show_term)
313		(void)printf("%c ", state);
314
315	(void)printf("%-*.*s ", (int)maxline, (int)maxline, line);
316	tstr = ctime(&t);
317	(void)printf("%.12s ", tstr ? tstr + 4 : "?");
318
319	if (show_idle) {
320		if (idle < 60)
321			(void)printf("  .   ");
322		else if (idle < (24 * 60 * 60))
323			(void)printf("%02ld:%02ld ",
324				     (long)(idle / (60 * 60)),
325				     (long)(idle % (60 * 60)) / 60);
326		else
327			(void)printf(" old  ");
328
329		(void)printf("\t%6d", pid);
330
331		if (show_details) {
332			if (type == RUN_LVL)
333				(void)printf("\tnew=%c old=%c", term, xit);
334			else
335				(void)printf("\tterm=%d exit=%d", term, xit);
336			(void)printf(" sess=%d", sess);
337			(void)printf(" type=%s ", types);
338		}
339	}
340
341	if (*host)
342		(void)printf("\t(%.*s)", (int)maxhost, host);
343	(void)putchar('\n');
344}
345
346static void
347output_labels(void)
348{
349	(void)printf("%-*.*s ", (int)maxname, (int)maxname, "USER");
350
351	if (show_term)
352		(void)printf("S ");
353
354	(void)printf("%-*.*s ", (int)maxline, (int)maxline, "LINE");
355	(void)printf("WHEN         ");
356
357	if (show_idle) {
358		(void)printf("IDLE  ");
359		(void)printf("\t   PID");
360
361		(void)printf("\tCOMMENT");
362	}
363
364	(void)putchar('\n');
365}
366
367static void
368quick(const char *fname)
369{
370	struct utmpentry *ehead, *ep;
371	int num = 0;
372
373	(void)getutentries(fname, &ehead);
374	for (ep = ehead; ep != NULL; ep = ep->next) {
375		(void)printf("%-*s ", (int)maxname, ep->name);
376		if ((++num % 8) == 0)
377			(void)putchar('\n');
378	}
379	if (num % 8)
380		(void)putchar('\n');
381
382	(void)printf("# users = %d\n", num);
383}
384
385static void
386usage(void)
387{
388	(void)fprintf(stderr, "Usage: %s [-abdHlmqrsTtuv] [file]\n\t%s am i\n",
389	    getprogname(), getprogname());
390	exit(EXIT_FAILURE);
391}
392