1/*
2 * Copyright (c) 1980, 1990, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 * (c) UNIX System Laboratories, Inc.
5 * All or some portions of this file are derived from material licensed
6 * to the University of California by American Telephone and Telegraph
7 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
8 * the permission of UNIX System Laboratories, Inc.
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. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 */
38
39#ifndef lint
40static const char copyright[] =
41"@(#) Copyright (c) 1980, 1990, 1993, 1994\n\
42	The Regents of the University of California.  All rights reserved.\n";
43#endif /* not lint */
44
45#ifndef lint
46#if 0
47static char sccsid[] = "@(#)df.c	8.9 (Berkeley) 5/8/95";
48#else
49static const char rcsid[] =
50  "$FreeBSD: src/bin/df/df.c,v 1.23.2.9 2002/07/01 00:14:24 iedowse Exp $";
51#endif
52#endif /* not lint */
53
54#ifdef __APPLE__
55#define MNT_IGNORE 0
56#endif
57
58#include <sys/cdefs.h>
59#include <sys/param.h>
60#include <sys/stat.h>
61#include <sys/mount.h>
62#include <sys/sysctl.h>
63#include <err.h>
64#include <errno.h>
65#include <fcntl.h>
66#include <fstab.h>
67#include <math.h>
68#include <stdio.h>
69#include <stdlib.h>
70#include <string.h>
71#include <sysexits.h>
72#include <unistd.h>
73#include <libutil.h>
74
75#ifdef __APPLE__
76#include "get_compat.h"
77#else
78#define COMPAT_MODE(func, mode) 1
79#endif
80
81#define UNITS_SI 1
82#define UNITS_2 2
83
84#define KILO_SZ(n) (n)
85#define MEGA_SZ(n) ((n) * (n))
86#define GIGA_SZ(n) ((n) * (n) * (n))
87#define TERA_SZ(n) ((n) * (n) * (n) * (n))
88#define PETA_SZ(n) ((n) * (n) * (n) * (n) * (n))
89
90#define KILO_2_SZ (KILO_SZ(1024ULL))
91#define MEGA_2_SZ (MEGA_SZ(1024ULL))
92#define GIGA_2_SZ (GIGA_SZ(1024ULL))
93#define TERA_2_SZ (TERA_SZ(1024ULL))
94#define PETA_2_SZ (PETA_SZ(1024ULL))
95
96#define KILO_SI_SZ (KILO_SZ(1000ULL))
97#define MEGA_SI_SZ (MEGA_SZ(1000ULL))
98#define GIGA_SI_SZ (GIGA_SZ(1000ULL))
99#define TERA_SI_SZ (TERA_SZ(1000ULL))
100#define PETA_SI_SZ (PETA_SZ(1000ULL))
101
102/* Maximum widths of various fields. */
103struct maxwidths {
104	int mntfrom;
105	int total;
106	int used;
107	int avail;
108	int iused;
109	int ifree;
110};
111
112unsigned long long vals_si [] = {1, KILO_SI_SZ, MEGA_SI_SZ, GIGA_SI_SZ, TERA_SI_SZ, PETA_SI_SZ};
113unsigned long long vals_base2[] = {1, KILO_2_SZ, MEGA_2_SZ, GIGA_2_SZ, TERA_2_SZ, PETA_2_SZ};
114unsigned long long *valp;
115
116typedef enum { NONE, KILO, MEGA, GIGA, TERA, PETA, UNIT_MAX } unit_t;
117
118unit_t unitp [] = { NONE, KILO, MEGA, GIGA, TERA, PETA };
119
120int	  bread(off_t, void *, int);
121int	  checkvfsname(const char *, char **);
122char	 *getmntpt(char *);
123int	  longwidth(long long);
124char	 *makenetvfslist(void);
125char	**makevfslist(const char *);
126void	  prthuman(struct statfs *, uint64_t);
127void	  prthumanval(int64_t);
128void	  prtstat(struct statfs *, struct maxwidths *);
129long	  regetmntinfo(struct statfs **, long, char **);
130unit_t	  unit_adjust(double *);
131void	  update_maxwidths(struct maxwidths *, struct statfs *);
132void	  usage(void);
133
134int	aflag = 0, hflag, iflag, nflag;
135
136static __inline int imax(int a, int b)
137{
138	return (a > b ? a : b);
139}
140
141int
142main(int argc, char *argv[])
143{
144	struct stat stbuf;
145	struct statfs statfsbuf, *mntbuf;
146	struct maxwidths maxwidths;
147	char *mntpt, **vfslist;
148	long mntsize;
149	int ch, i, rv, tflag = 0, kludge_tflag = 0;
150	int kflag = 0;
151	const char *options = "abgHhiklmnPt:T:";
152	if (COMPAT_MODE("bin/df", "unix2003")) {
153		/* Unix2003 requires -t be "include total capacity". which df
154		  already does, but it conflicts with the old -t so we need to
155		  *not* expect a string after -t (we provide -T in both cases
156		  to cover the old use of -t) */
157		options = "abgHhiklmnPtT:";
158		iflag = 1;
159	}
160
161	vfslist = NULL;
162	while ((ch = getopt(argc, argv, options)) != -1)
163		switch (ch) {
164		case 'a':
165			aflag = 1;
166			break;
167		case 'b':
168				/* FALLTHROUGH */
169		case 'P':
170			if (COMPAT_MODE("bin/df", "unix2003")) {
171				if (!kflag) {
172					/* -k overrides -P */
173					putenv("BLOCKSIZE=512");
174				}
175				iflag = 0;
176			} else {
177				putenv("BLOCKSIZE=512");
178			}
179			hflag = 0;
180			break;
181		case 'g':
182			putenv("BLOCKSIZE=1g");
183			hflag = 0;
184			break;
185		case 'H':
186			hflag = UNITS_SI;
187			valp = vals_si;
188			break;
189		case 'h':
190			hflag = UNITS_2;
191			valp = vals_base2;
192			break;
193		case 'i':
194			iflag = 1;
195			break;
196		case 'k':
197			if (COMPAT_MODE("bin/df", "unix2003")) {
198				putenv("BLOCKSIZE=1024");
199			} else {
200				putenv("BLOCKSIZE=1k");
201			}
202			kflag = 1;
203			hflag = 0;
204			break;
205		case 'l':
206			if (tflag)
207				errx(1, "-l and -T are mutually exclusive.");
208			if (vfslist != NULL)
209				break;
210			vfslist = makevfslist(makenetvfslist());
211			break;
212		case 'm':
213			putenv("BLOCKSIZE=1m");
214			hflag = 0;
215			break;
216		case 'n':
217			nflag = 1;
218			break;
219		case 't':
220			/* Unix2003 uses -t for something we do by default */
221			if (COMPAT_MODE("bin/df", "unix2003")) {
222			    kludge_tflag = 1;
223			    break;
224			}
225		case 'T':
226			if (vfslist != NULL) {
227				if (tflag)
228					errx(1, "only one -%c option may be specified", ch);
229				else
230					errx(1, "-l and -%c are mutually exclusive.", ch);
231			}
232			tflag++;
233			vfslist = makevfslist(optarg);
234			break;
235		case '?':
236		default:
237			usage();
238		}
239	argc -= optind;
240	argv += optind;
241
242	/* If we are in unix2003 mode, have seen a -t but no -T and the first
243	  non switch arg isn't a file, let's pretend they used -T on it.
244	  This makes the Lexmark printer installer happy (PR-3918471) */
245	if (tflag == 0 && kludge_tflag && *argv && stat(*argv, &stbuf) < 0
246	  && errno == ENOENT) {
247	    vfslist = makevfslist(*argv++);
248	}
249
250	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
251	bzero(&maxwidths, sizeof(maxwidths));
252	for (i = 0; i < mntsize; i++)
253		update_maxwidths(&maxwidths, &mntbuf[i]);
254
255	rv = 0;
256	if (!*argv) {
257		mntsize = regetmntinfo(&mntbuf, mntsize, vfslist);
258		bzero(&maxwidths, sizeof(maxwidths));
259		for (i = 0; i < mntsize; i++)
260			update_maxwidths(&maxwidths, &mntbuf[i]);
261		for (i = 0; i < mntsize; i++) {
262			if (aflag || (mntbuf[i].f_flags & MNT_IGNORE) == 0)
263				prtstat(&mntbuf[i], &maxwidths);
264		}
265		exit(rv);
266	}
267
268	for (; *argv; argv++) {
269		if (stat(*argv, &stbuf) < 0) {
270			if ((mntpt = getmntpt(*argv)) == 0) {
271				warn("%s", *argv);
272				rv = 1;
273				continue;
274			}
275		} else if (S_ISCHR(stbuf.st_mode) || S_ISBLK(stbuf.st_mode)) {
276			warnx("%s: Raw devices not supported", *argv);
277			rv = 1;
278			continue;
279		} else
280			mntpt = *argv;
281		/*
282		 * Statfs does not take a `wait' flag, so we cannot
283		 * implement nflag here.
284		 */
285		if (statfs(mntpt, &statfsbuf) < 0) {
286			warn("%s", mntpt);
287			rv = 1;
288			continue;
289		}
290		/* Check to make sure the arguments we've been
291		 * given are satisfied.  Return an error if we
292		 * have been asked to list a mount point that does
293		 * not match the other args we've been given (-l, -t, etc.)
294		 */
295		if (checkvfsname(statfsbuf.f_fstypename, vfslist)) {
296			rv++;
297			continue;
298		}
299
300		if (argc == 1) {
301		        bzero(&maxwidths, sizeof(maxwidths));
302			update_maxwidths(&maxwidths, &statfsbuf);
303		}
304		prtstat(&statfsbuf, &maxwidths);
305	}
306	return (rv);
307}
308
309char *
310getmntpt(char *name)
311{
312	long mntsize, i;
313	struct statfs *mntbuf;
314
315	mntsize = getmntinfo(&mntbuf, MNT_NOWAIT);
316	for (i = 0; i < mntsize; i++) {
317		if (!strcmp(mntbuf[i].f_mntfromname, name))
318			return (mntbuf[i].f_mntonname);
319	}
320	return (0);
321}
322
323/*
324 * Make a pass over the filesystem info in ``mntbuf'' filtering out
325 * filesystem types not in vfslist and possibly re-stating to get
326 * current (not cached) info.  Returns the new count of valid statfs bufs.
327 */
328long
329regetmntinfo(struct statfs **mntbufp, long mntsize, char **vfslist)
330{
331	int i, j;
332	struct statfs *mntbuf;
333
334	if (vfslist == NULL)
335		return (nflag ? mntsize : getmntinfo(mntbufp, MNT_WAIT));
336
337	mntbuf = *mntbufp;
338	for (j = 0, i = 0; i < mntsize; i++) {
339		if (checkvfsname(mntbuf[i].f_fstypename, vfslist))
340			continue;
341		if (!nflag)
342			(void)statfs(mntbuf[i].f_mntonname,&mntbuf[j]);
343		else if (i != j)
344			mntbuf[j] = mntbuf[i];
345		j++;
346	}
347	return (j);
348}
349
350/*
351 * Output in "human-readable" format.  Uses 3 digits max and puts
352 * unit suffixes at the end.  Makes output compact and easy to read,
353 * especially on huge disks.
354 *
355 */
356unit_t
357unit_adjust(double *val)
358{
359	double abval;
360	unit_t unit;
361	unsigned int unit_sz;
362
363	abval = fabs(*val);
364
365	unit_sz = abval ? ilogb(abval) / 10 : 0;
366
367	if (unit_sz >= UNIT_MAX) {
368		unit = NONE;
369	} else {
370		unit = unitp[unit_sz];
371		*val /= (double)valp[unit_sz];
372	}
373
374	return (unit);
375}
376
377void
378prthuman(struct statfs *sfsp, uint64_t used)
379{
380	int64_t value;
381
382	value = sfsp->f_blocks;
383	value *= sfsp->f_bsize;
384        prthumanval(value);
385	value = used;
386	value *= sfsp->f_bsize;
387        prthumanval(value);
388	value = sfsp->f_bavail;
389	value *= sfsp->f_bsize;
390	prthumanval(value);
391}
392
393void
394prthumanval(int64_t bytes)
395{
396        char buf[6];
397        int flags;
398
399        flags = HN_B | HN_NOSPACE | HN_DECIMAL;
400        if (hflag == UNITS_SI)
401                flags |= HN_DIVISOR_1000;
402
403        humanize_number(buf, sizeof(buf) - (bytes < 0 ? 0 : 1),
404			bytes, "", HN_AUTOSCALE, flags);
405
406	if (hflag == UNITS_SI)
407		(void)printf(" %6s", buf);
408	else
409		(void)printf("%6si", buf);
410
411}
412
413/*
414 * Convert statfs returned filesystem size into BLOCKSIZE units.
415 * Attempts to avoid overflow for large filesystems.
416 */
417static intmax_t fsbtoblk(int64_t num, uint64_t fsbs, u_long bs, char *fs)
418{
419	if (num < 0) {
420		warnx("negative filesystem block count/size from fs %s", fs);
421		return 0;
422	} else if ((fsbs != 0) && (fsbs < bs)) {
423		return (num / (intmax_t) (bs / fsbs));
424	} else {
425		return (num * (intmax_t) (fsbs / bs));
426	}
427}
428
429/*
430 * Print out status about a filesystem.
431 */
432void
433prtstat(struct statfs *sfsp, struct maxwidths *mwp)
434{
435	static long blocksize;
436	static int headerlen, timesthrough;
437	static const char *header;
438	uint64_t used, availblks, inodes;
439	char * avail_str;
440
441	if (++timesthrough == 1) {
442		mwp->mntfrom = imax(mwp->mntfrom, (int)strlen("Filesystem"));
443		if (hflag) {
444			header = "  Size";
445			mwp->total = mwp->used = mwp->avail = (int)strlen(header);
446		} else {
447			header = getbsize(&headerlen, &blocksize);
448			mwp->total = imax(mwp->total, headerlen);
449		}
450		mwp->used = imax(mwp->used, (int)strlen("Used"));
451		if (COMPAT_MODE("bin/df", "unix2003") && !hflag) {
452			avail_str = "Available";
453		} else {
454			avail_str = "Avail";
455		}
456		mwp->avail = imax(mwp->avail, (int)strlen(avail_str));
457
458		(void)printf("%-*s %*s %*s %*s Capacity", mwp->mntfrom,
459		    "Filesystem", mwp->total, header, mwp->used, "Used",
460		    mwp->avail, avail_str);
461		if (iflag) {
462			mwp->iused = imax(mwp->iused, (int)strlen("  iused"));
463			mwp->ifree = imax(mwp->ifree, (int)strlen("ifree"));
464			(void)printf(" %*s %*s %%iused", mwp->iused - 2,
465			    "iused", mwp->ifree, "ifree");
466		}
467		(void)printf("  Mounted on\n");
468	}
469
470	(void)printf("%-*s", mwp->mntfrom, sfsp->f_mntfromname);
471	if (sfsp->f_blocks > sfsp->f_bfree)
472		used = sfsp->f_blocks - sfsp->f_bfree;
473	else
474		used = 0;
475	availblks = sfsp->f_bavail + used;
476	if (hflag) {
477		prthuman(sfsp, used);
478	} else {
479		(void)printf(" %*jd %*jd %*jd", mwp->total,
480			     fsbtoblk(sfsp->f_blocks, sfsp->f_bsize, blocksize, sfsp->f_mntonname),
481			     mwp->used, fsbtoblk(used, sfsp->f_bsize, blocksize, sfsp->f_mntonname),
482			     mwp->avail, fsbtoblk(sfsp->f_bavail, sfsp->f_bsize, blocksize, sfsp->f_mntonname));
483	}
484	if (COMPAT_MODE("bin/df", "unix2003")) {
485		/* Standard says percentage must be rounded UP to next
486		   integer value, not truncated */
487		double value;
488		if (availblks == 0)
489			value = 100.0;
490		else {
491			value = (double)used / (double)availblks * 100.0;
492			if ((value-(int)value) > 0.0) value = value + 1.0;
493		}
494		(void)printf(" %5.0f%%", trunc(value));
495	} else {
496		(void)printf(" %5.0f%%",
497		    availblks == 0 ? 100.0 : (double)used / (double)availblks * 100.0);
498	}
499	if (iflag) {
500		inodes = sfsp->f_files;
501		used = inodes - sfsp->f_ffree;
502		(void)printf(" %*llu %*lu %4.0f%% ", mwp->iused, used,
503		    mwp->ifree, (unsigned long)sfsp->f_ffree, inodes == 0 ? 100.0 :
504		    (double)used / (double)inodes * 100.0);
505	} else
506		(void)printf("  ");
507	(void)printf("  %s\n", sfsp->f_mntonname);
508}
509
510/*
511 * Update the maximum field-width information in `mwp' based on
512 * the filesystem specified by `sfsp'.
513 */
514void
515update_maxwidths(struct maxwidths *mwp, struct statfs *sfsp)
516{
517	static long blocksize;
518	int dummy;
519
520	if (blocksize == 0)
521		getbsize(&dummy, &blocksize);
522
523	mwp->mntfrom = imax(mwp->mntfrom, (int)strlen(sfsp->f_mntfromname));
524	mwp->total = imax(mwp->total, longwidth(fsbtoblk(sfsp->f_blocks,
525							 sfsp->f_bsize, blocksize, sfsp->f_mntonname)));
526	if (sfsp->f_blocks >= sfsp->f_bfree)
527		mwp->used = imax(mwp->used, longwidth(fsbtoblk(sfsp->f_blocks -
528							       sfsp->f_bfree, sfsp->f_bsize, blocksize, sfsp->f_mntonname)));
529	mwp->avail = imax(mwp->avail, longwidth(fsbtoblk(sfsp->f_bavail,
530							 sfsp->f_bsize, blocksize, sfsp->f_mntonname)));
531	mwp->iused = imax(mwp->iused, longwidth((unsigned)(sfsp->f_files - sfsp->f_ffree)));
532	mwp->ifree = imax(mwp->ifree, longwidth((unsigned)(sfsp->f_ffree)));
533}
534
535/* Return the width in characters of the specified long. */
536int
537longwidth(long long val)
538{
539	int len;
540
541	len = 0;
542	/* Negative or zero values require one extra digit. */
543	if (val <= 0) {
544		val = -val;
545		len++;
546	}
547	while (val > 0) {
548		len++;
549		val /= 10;
550	}
551
552	return (len);
553}
554
555void
556usage(void)
557{
558
559	char *t_flag = COMPAT_MODE("bin/df", "unix2003") ? "[-t]" : "[-t type]";
560	(void)fprintf(stderr,
561	    "usage: df [-b | -H | -h | -k | -m | -g | -P] [-ailn] [-T type] %s [filesystem ...]\n", t_flag);
562	exit(EX_USAGE);
563}
564
565char *
566makenetvfslist(void)
567{
568	char *str, *strptr, **listptr;
569#ifndef __APPLE__
570	int mib[3], maxvfsconf, cnt=0, i;
571	size_t miblen;
572	struct ovfsconf *ptr;
573#else
574	int mib[4], maxvfsconf, cnt=0, i;
575	size_t miblen;
576	struct vfsconf vfc;
577#endif
578
579	mib[0] = CTL_VFS; mib[1] = VFS_GENERIC; mib[2] = VFS_MAXTYPENUM;
580	miblen=sizeof(maxvfsconf);
581	if (sysctl(mib, (unsigned int)(sizeof(mib) / sizeof(mib[0])),
582	    &maxvfsconf, &miblen, NULL, 0)) {
583		warnx("sysctl failed");
584		return (NULL);
585	}
586
587	if ((listptr = malloc(sizeof(char*) * maxvfsconf)) == NULL) {
588		warnx("malloc failed");
589		return (NULL);
590	}
591
592#ifndef __APPLE__
593	for (ptr = getvfsent(); ptr; ptr = getvfsent())
594		if (ptr->vfc_flags & VFCF_NETWORK) {
595			listptr[cnt++] = strdup(ptr->vfc_name);
596			if (listptr[cnt-1] == NULL) {
597				warnx("malloc failed");
598				return (NULL);
599			}
600		}
601#else
602	miblen = sizeof (struct vfsconf);
603	mib[2] = VFS_CONF;
604        for (i = 0; i < maxvfsconf; i++) {
605		mib[3] = i;
606		if (sysctl(mib, 4, &vfc, &miblen, NULL, 0) == 0) {
607	                if (!(vfc.vfc_flags & MNT_LOCAL)) {
608	                        listptr[cnt++] = strdup(vfc.vfc_name);
609	                        if (listptr[cnt-1] == NULL) {
610	                                warnx("malloc failed");
611	                                return (NULL);
612	                        }
613	                }
614		}
615	}
616#endif
617
618	if (cnt == 0 ||
619	    (str = malloc(sizeof(char) * (32 * cnt + cnt + 2))) == NULL) {
620		if (cnt > 0)
621			warnx("malloc failed");
622		free(listptr);
623		return (NULL);
624	}
625
626	*str = 'n'; *(str + 1) = 'o';
627	for (i = 0, strptr = str + 2; i < cnt; i++, strptr++) {
628		strncpy(strptr, listptr[i], 32);
629		strptr += strlen(listptr[i]);
630		*strptr = ',';
631		free(listptr[i]);
632	}
633	*(--strptr) = '\0';
634
635	free(listptr);
636	return (str);
637}
638