GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/w/w.c Lines: 0 241 0.0 %
Date: 2017-11-13 Branches: 0 185 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: w.c,v 1.63 2017/07/27 14:17:34 jca 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. Neither the name of the University nor the names of its contributors
16
 *    may be used to endorse or promote products derived from this software
17
 *    without specific prior written permission.
18
 *
19
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29
 * SUCH DAMAGE.
30
 */
31
32
/*
33
 * w - print system status (who and what)
34
 *
35
 * This program is similar to the systat command on Tenex/Tops 10/20
36
 *
37
 */
38
#include <sys/param.h>	/* MAXCOMLEN */
39
#include <sys/time.h>
40
#include <sys/stat.h>
41
#include <sys/sysctl.h>
42
#include <sys/signal.h>
43
#include <sys/proc.h>
44
#include <sys/ioctl.h>
45
#include <sys/socket.h>
46
#include <sys/tty.h>
47
48
#include <netinet/in.h>
49
#include <arpa/inet.h>
50
51
#include <ctype.h>
52
#include <err.h>
53
#include <errno.h>
54
#include <fcntl.h>
55
#include <kvm.h>
56
#include <netdb.h>
57
#include <nlist.h>
58
#include <paths.h>
59
#include <stdio.h>
60
#include <stdlib.h>
61
#include <string.h>
62
#include <unistd.h>
63
#include <limits.h>
64
#include <utmp.h>
65
#include <vis.h>
66
67
#include "extern.h"
68
69
struct timeval	boottime;
70
struct utmp	utmp;
71
struct winsize	ws;
72
kvm_t	       *kd;
73
time_t		now;		/* the current time of day */
74
int		ttywidth;	/* width of tty */
75
int		argwidth;	/* width of tty */
76
int		header = 1;	/* true if -h flag: don't print heading */
77
int		nflag = 1;	/* true if -n flag: don't convert addrs */
78
int		sortidle;	/* sort by idle time */
79
char	       *sel_user;	/* login of particular user selected */
80
char		domain[HOST_NAME_MAX+1];
81
82
#define	NAME_WIDTH	8
83
#define HOST_WIDTH	16
84
85
/*
86
 * One of these per active utmp entry.
87
 */
88
struct	entry {
89
	struct	entry *next;
90
	struct	utmp utmp;
91
	dev_t	tdev;			/* dev_t of terminal */
92
	time_t	idle;			/* idle time of terminal in seconds */
93
	struct	kinfo_proc *kp;		/* `most interesting' proc */
94
} *ep, *ehead = NULL, **nextp = &ehead;
95
96
static void	 fmt_putc(int, int *);
97
static void	 fmt_puts(const char *, int *);
98
static void	 pr_args(struct kinfo_proc *);
99
static void	 pr_header(time_t *, int);
100
static struct stat
101
		*ttystat(char *);
102
static void	 usage(int);
103
104
int
105
main(int argc, char *argv[])
106
{
107
	extern char *__progname;
108
	struct kinfo_proc *kp;
109
	struct hostent *hp;
110
	struct stat *stp;
111
	FILE *ut;
112
	struct in_addr addr;
113
	int ch, i, nentries, nusers, wcmd;
114
	char *memf, *nlistf, *p, *x;
115
	char buf[HOST_NAME_MAX+1], errbuf[_POSIX2_LINE_MAX];
116
117
	/* Are we w(1) or uptime(1)? */
118
	p = __progname;
119
	if (*p == '-')
120
		p++;
121
	if (p[0] == 'w' && p[1] == '\0') {
122
		wcmd = 1;
123
		p = "hiflM:N:asuw";
124
	} else if (!strcmp(p, "uptime")) {
125
		wcmd = 0;
126
		p = "";
127
	} else
128
		errx(1,
129
		 "this program should be invoked only as \"w\" or \"uptime\"");
130
131
	memf = nlistf = NULL;
132
	while ((ch = getopt(argc, argv, p)) != -1)
133
		switch (ch) {
134
		case 'h':
135
			header = 0;
136
			break;
137
		case 'i':
138
			sortidle = 1;
139
			break;
140
		case 'M':
141
			header = 0;
142
			memf = optarg;
143
			break;
144
		case 'N':
145
			nlistf = optarg;
146
			break;
147
		case 'a':
148
			nflag = 0;
149
			break;
150
		case 'f': case 'l': case 's': case 'u': case 'w':
151
			warnx("[-flsuw] no longer supported");
152
			/* FALLTHROUGH */
153
		case '?':
154
		default:
155
			usage(wcmd);
156
		}
157
	argc -= optind;
158
	argv += optind;
159
160
	if (nflag == 0) {
161
		if (pledge("stdio tty rpath dns ps vminfo flock cpath wpath", NULL) == -1)
162
			err(1, "pledge");
163
	} else {
164
		if (pledge("stdio tty rpath ps vminfo flock cpath wpath", NULL) == -1)
165
			err(1, "pledge");
166
	}
167
168
	if (nlistf == NULL && memf == NULL) {
169
		if ((kd = kvm_openfiles(nlistf, memf, NULL, KVM_NO_FILES,
170
		    errbuf)) == NULL)
171
			errx(1, "%s", errbuf);
172
	} else {
173
		if ((kd = kvm_openfiles(nlistf, memf, NULL, O_RDONLY, errbuf)) == NULL)
174
			errx(1, "%s", errbuf);
175
	}
176
177
	(void)time(&now);
178
	if ((ut = fopen(_PATH_UTMP, "r")) == NULL)
179
		err(1, "%s", _PATH_UTMP);
180
181
	if (*argv)
182
		sel_user = *argv;
183
184
	for (nusers = 0; fread(&utmp, sizeof(utmp), 1, ut);) {
185
		if (utmp.ut_name[0] == '\0')
186
			continue;
187
		++nusers;
188
		if (wcmd == 0 || (sel_user &&
189
		    strncmp(utmp.ut_name, sel_user, UT_NAMESIZE) != 0))
190
			continue;
191
		if ((ep = calloc(1, sizeof(*ep))) == NULL)
192
			err(1, NULL);
193
		*nextp = ep;
194
		nextp = &(ep->next);
195
		memcpy(&(ep->utmp), &utmp, sizeof(utmp));
196
		if (!(stp = ttystat(ep->utmp.ut_line)))
197
			continue;
198
		ep->tdev = stp->st_rdev;
199
200
		/*
201
		 * If this is the console device, attempt to ascertain
202
		 * the true console device dev_t.
203
		 */
204
		if (ep->tdev == 0) {
205
			int mib[2];
206
			size_t size;
207
208
			mib[0] = CTL_KERN;
209
			mib[1] = KERN_CONSDEV;
210
			size = sizeof(dev_t);
211
			(void) sysctl(mib, 2, &ep->tdev, &size, NULL, 0);
212
		}
213
214
		if ((ep->idle = now - stp->st_atime) < 0)
215
			ep->idle = 0;
216
	}
217
	(void)fclose(ut);
218
219
	if (header || wcmd == 0) {
220
		pr_header(&now, nusers);
221
		if (wcmd == 0)
222
			exit (0);
223
	}
224
225
#define HEADER	"USER    TTY FROM              LOGIN@  IDLE WHAT"
226
#define WUSED	(sizeof(HEADER) - sizeof("WHAT"))
227
	(void)puts(HEADER);
228
229
	kp = kvm_getprocs(kd, KERN_PROC_ALL, 0, sizeof(*kp), &nentries);
230
	if (kp == NULL)
231
		errx(1, "%s", kvm_geterr(kd));
232
233
	if ((ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == -1 &&
234
	    ioctl(STDERR_FILENO, TIOCGWINSZ, &ws) == -1 &&
235
	    ioctl(STDIN_FILENO, TIOCGWINSZ, &ws) == -1) || ws.ws_col == 0)
236
		ttywidth = 79;
237
	else
238
		ttywidth = ws.ws_col - 1;
239
	argwidth = ttywidth - WUSED;
240
	if (argwidth < 4)
241
		argwidth = 8;
242
243
	for (i = 0; i < nentries; i++, kp++) {
244
		if (kp->p_psflags & (PS_EMBRYO | PS_ZOMBIE))
245
			continue;
246
		for (ep = ehead; ep != NULL; ep = ep->next) {
247
			/* ftp is a special case. */
248
			if (strncmp(ep->utmp.ut_line, "ftp", 3) == 0) {
249
				char pidstr[UT_LINESIZE-2];
250
				pid_t fp;
251
252
				(void)strncpy(pidstr, &ep->utmp.ut_line[3],
253
				    sizeof(pidstr) - 1);
254
				pidstr[sizeof(pidstr) - 1] = '\0';
255
				fp = (pid_t)strtol(pidstr, NULL, 10);
256
				if (kp->p_pid == fp) {
257
					ep->kp = kp;
258
					break;
259
				}
260
			} else if (ep->tdev == kp->p_tdev &&
261
			    kp->p__pgid == kp->p_tpgid) {
262
				/*
263
				 * Proc is in foreground of this terminal
264
				 */
265
				if (proc_compare(ep->kp, kp))
266
					ep->kp = kp;
267
				break;
268
			}
269
		}
270
	}
271
	/* sort by idle time */
272
	if (sortidle && ehead != NULL) {
273
		struct entry *from = ehead, *save;
274
275
		ehead = NULL;
276
		while (from != NULL) {
277
			for (nextp = &ehead;
278
			    (*nextp) && from->idle >= (*nextp)->idle;
279
			    nextp = &(*nextp)->next)
280
				continue;
281
			save = from;
282
			from = from->next;
283
			save->next = *nextp;
284
			*nextp = save;
285
		}
286
	}
287
288
	if (!nflag) {
289
		if (gethostname(domain, sizeof(domain)) < 0 ||
290
		    (p = strchr(domain, '.')) == 0)
291
			domain[0] = '\0';
292
		else {
293
			domain[sizeof(domain) - 1] = '\0';
294
			memmove(domain, p, strlen(p) + 1);
295
		}
296
	}
297
298
	for (ep = ehead; ep != NULL; ep = ep->next) {
299
		p = *ep->utmp.ut_host ? ep->utmp.ut_host : "-";
300
		for (x = NULL, i = 0; p[i] != '\0' && i < UT_HOSTSIZE; i++)
301
			if (p[i] == ':') {
302
				x = &p[i];
303
				*x++ = '\0';
304
				break;
305
			}
306
		if (!nflag && inet_aton(p, &addr) &&
307
		    (hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET))) {
308
			if (domain[0] != '\0') {
309
				p = hp->h_name;
310
				p += strlen(hp->h_name);
311
				p -= strlen(domain);
312
				if (p > hp->h_name &&
313
				    strcasecmp(p, domain) == 0)
314
					*p = '\0';
315
			}
316
			p = hp->h_name;
317
		}
318
		if (x) {
319
			(void)snprintf(buf, sizeof(buf), "%s:%.*s", p,
320
			    (int)(ep->utmp.ut_host + UT_HOSTSIZE - x), x);
321
			p = buf;
322
		}
323
		(void)printf("%-*.*s %-2.2s %-*.*s ",
324
		    NAME_WIDTH, UT_NAMESIZE, ep->utmp.ut_name,
325
		    strncmp(ep->utmp.ut_line, "tty", 3) ?
326
		    ep->utmp.ut_line : ep->utmp.ut_line + 3,
327
		    HOST_WIDTH, HOST_WIDTH, *p ? p : "-");
328
		pr_attime(&ep->utmp.ut_time, &now);
329
		pr_idle(ep->idle);
330
		pr_args(ep->kp);
331
		printf("\n");
332
	}
333
	exit(0);
334
}
335
336
static void
337
fmt_putc(int c, int *leftp)
338
{
339
340
	if (*leftp == 0)
341
		return;
342
	if (*leftp != -1)
343
		*leftp -= 1;
344
	putchar(c);
345
}
346
347
static void
348
fmt_puts(const char *s, int *leftp)
349
{
350
	static char *v = NULL;
351
	static size_t maxlen = 0;
352
	size_t len;
353
354
	if (*leftp == 0)
355
		return;
356
	len = strlen(s) * 4 + 1;
357
	if (len > maxlen) {
358
		free(v);
359
		maxlen = 0;
360
		if (len < getpagesize())
361
			len = getpagesize();
362
		v = malloc(len);
363
		if (v == NULL)
364
			return;
365
		maxlen = len;
366
	}
367
	strvis(v, s, VIS_TAB | VIS_NL | VIS_CSTYLE);
368
	if (*leftp != -1) {
369
		len = strlen(v);
370
		if (len > *leftp) {
371
			v[*leftp] = '\0';
372
			*leftp = 0;
373
		} else
374
			*leftp -= len;
375
	}
376
	printf("%s", v);
377
}
378
379
380
static void
381
pr_args(struct kinfo_proc *kp)
382
{
383
	char **argv, *str;
384
	int left;
385
386
	if (kp == NULL)
387
		goto nothing;		/* no matching process found */
388
	left = argwidth;
389
	argv = kvm_getargv(kd, kp, argwidth+60);  /* +60 for ftpd snip */
390
	if (argv == NULL)
391
		goto nothing;
392
393
	if (*argv == NULL || **argv == '\0') {
394
		/* Process has zeroed argv[0], display executable name. */
395
		fmt_putc('(', &left);
396
		fmt_puts(kp->p_comm, &left);
397
		fmt_putc(')', &left);
398
	}
399
	while (*argv) {
400
		/*
401
		 * ftp argv[0] is in the following format:
402
		 * ftpd: HOSTNAME: [USER/PASS: ]CMD args (ftpd)
403
		 */
404
		if (strncmp(*argv, "ftpd:", 5) == 0) {
405
			if ((str = strchr(*argv + 5, ':')) != NULL)
406
				str = strchr(str + 1, ':');
407
			if (str != NULL) {
408
				if ((str[0] == ':') &&
409
				    isspace((unsigned char)str[1]))
410
					str += 2;
411
				fmt_puts(str, &left);
412
			} else
413
				fmt_puts(*argv, &left);
414
		} else
415
			fmt_puts(*argv, &left);
416
		argv++;
417
		fmt_putc(' ', &left);
418
	}
419
	return;
420
nothing:
421
	putchar('-');
422
}
423
424
static void
425
pr_header(time_t *nowp, int nusers)
426
{
427
	double avenrun[3];
428
	time_t uptime;
429
	int days, hrs, i, mins;
430
	int mib[2];
431
	size_t size;
432
	char buf[256];
433
434
	/*
435
	 * Print time of day.
436
	 */
437
	(void)strftime(buf, sizeof(buf) - 1, "%l:%M%p", localtime(nowp));
438
	buf[sizeof(buf) - 1] = '\0';
439
	(void)printf("%s ", buf);
440
441
	/*
442
	 * Print how long system has been up.
443
	 * (Found by getting "boottime" from the kernel)
444
	 */
445
	mib[0] = CTL_KERN;
446
	mib[1] = KERN_BOOTTIME;
447
	size = sizeof(boottime);
448
	if (sysctl(mib, 2, &boottime, &size, NULL, 0) != -1) {
449
		uptime = now - boottime.tv_sec;
450
		if (uptime > 59) {
451
			uptime += 30;
452
			days = uptime / SECSPERDAY;
453
			uptime %= SECSPERDAY;
454
			hrs = uptime / SECSPERHOUR;
455
			uptime %= SECSPERHOUR;
456
			mins = uptime / 60;
457
			(void)printf(" up");
458
			if (days > 0)
459
				(void)printf(" %d day%s,", days,
460
				    days > 1 ? "s" : "");
461
			if (hrs > 0 && mins > 0)
462
				(void)printf(" %2d:%02d,", hrs, mins);
463
			else {
464
				if (hrs > 0)
465
					(void)printf(" %d hr%s,",
466
					    hrs, hrs > 1 ? "s" : "");
467
				if (mins > 0 || (days == 0 && hrs == 0))
468
					(void)printf(" %d min%s,",
469
					    mins, mins != 1 ? "s" : "");
470
			}
471
		} else
472
			printf(" %d secs,", (int)uptime);
473
	}
474
475
	/* Print number of users logged in to system */
476
	(void)printf(" %d user%s", nusers, nusers != 1 ? "s" : "");
477
478
	/*
479
	 * Print 1, 5, and 15 minute load averages.
480
	 */
481
	if (getloadavg(avenrun, sizeof(avenrun) / sizeof(avenrun[0])) == -1)
482
		(void)printf(", no load average information available\n");
483
	else {
484
		(void)printf(", load averages:");
485
		for (i = 0; i < (sizeof(avenrun) / sizeof(avenrun[0])); i++) {
486
			if (i > 0)
487
				(void)printf(",");
488
			(void)printf(" %.2f", avenrun[i]);
489
		}
490
		(void)printf("\n");
491
	}
492
}
493
494
static struct stat *
495
ttystat(char *line)
496
{
497
	static struct stat sb;
498
	char ttybuf[sizeof(_PATH_DEV) + UT_LINESIZE];
499
500
	/* Note, line may not be NUL-terminated */
501
	(void)strlcpy(ttybuf, _PATH_DEV, sizeof(ttybuf));
502
	(void)strncat(ttybuf, line, sizeof(ttybuf) - 1 - strlen(ttybuf));
503
	if (stat(ttybuf, &sb))
504
		return (NULL);
505
	return (&sb);
506
}
507
508
static void
509
usage(int wcmd)
510
{
511
	if (wcmd)
512
		(void)fprintf(stderr,
513
		    "usage: w [-ahi] [-M core] [-N system] [user]\n");
514
	else
515
		(void)fprintf(stderr,
516
		    "usage: uptime\n");
517
	exit (1);
518
}