1/*
2 * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
3 * Copyright (c) 1995 Martin Husemann
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by Martin Husemann
16 *	and Wolfgang Solfrank.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 */
32
33
34#include <sys/cdefs.h>
35#ifndef lint
36__RCSID("$NetBSD: check.c,v 1.10 2000/04/25 23:02:51 jdolecek Exp $");
37static const char rcsid[] =
38  "$FreeBSD: src/sbin/fsck_msdosfs/check.c,v 1.10 2004/02/05 15:47:46 bde Exp $";
39#endif /* not lint */
40
41#include <stdlib.h>
42#include <string.h>
43#include <ctype.h>
44#include <stdio.h>
45#include <unistd.h>
46#include <fcntl.h>
47
48#include "ext.h"
49#include "fsutil.h"
50
51/*
52 * If the FAT > this size then skip comparing, lest we risk
53 * OOMing the framework. in the future we need to just re-write
54 * this whole thing and optimize for less memory
55 */
56#define FAT_COMPARE_MAX_KB 4096
57
58int
59checkfilesys(const char *fname)
60{
61	int dosfs;
62	struct bootblock boot;
63	struct fatEntry *fat = NULL;
64	int i, finish_dosdirsection=0;
65	int mod = 0;
66	int ret = 8;
67        int quiet = 0;
68        int skip_fat_compare = 0;
69
70	rdonly = alwaysno;
71	if (!quiet)
72		printf("** %s", fname);
73
74	dosfs = open(fname, rdonly ? O_RDONLY : O_RDWR, 0);
75	if (dosfs < 0 && !rdonly) {
76		dosfs = open(fname, O_RDONLY, 0);
77		if (dosfs >= 0)
78			pwarn(" (NO WRITE)\n");
79		else if (!quiet)
80			printf("\n");
81		rdonly = 1;
82	} else if (!quiet)
83		printf("\n");
84
85	if (dosfs < 0) {
86		perror("Can't open");
87		return 8;
88	}
89
90	if (readboot(dosfs, &boot) == FSFATAL) {
91		close(dosfs);
92		printf("\n");
93		return 8;
94	}
95
96	if (skipclean && preen && checkdirty(dosfs, &boot)) {
97		printf("%s: ", fname);
98		printf("FILESYSTEM CLEAN; SKIPPING CHECKS\n");
99		ret = 0;
100		goto out;
101	}
102
103        if (((boot.FATsecs * boot.BytesPerSec) / 1024) > FAT_COMPARE_MAX_KB)
104            skip_fat_compare = 1;
105
106	if (!quiet)  {
107                if (skip_fat_compare)
108                        printf("** Phase 1 - Read FAT (compare skipped)\n");
109		else if (boot.ValidFat < 0)
110			printf("** Phase 1 - Read and Compare FATs\n");
111		else
112			printf("** Phase 1 - Read FAT\n");
113	}
114
115	mod |= readfat(dosfs, &boot, boot.ValidFat >= 0 ? boot.ValidFat : 0, &fat);
116	if (mod & FSFATAL) {
117		printf("Fatal error during readfat()\n");
118		close(dosfs);
119		return 8;
120	}
121
122	if (!skip_fat_compare && boot.ValidFat < 0)
123		for (i = 1; i < (int)boot.FATs; i++) {
124			struct fatEntry *currentFat;
125
126			mod |= readfat(dosfs, &boot, i, &currentFat);
127
128			if (mod & FSFATAL) {
129				printf("Fatal error during readfat() for comparison\n");
130				goto out;
131			}
132
133			mod |= comparefat(&boot, fat, currentFat, i);
134			free(currentFat);
135			if (mod & FSFATAL) {
136				printf("Fatal error during FAT comparison\n");
137				goto out;
138			}
139		}
140
141	if (!quiet)
142		printf("** Phase 2 - Check Cluster Chains\n");
143
144	mod |= checkfat(&boot, fat);
145	if (mod & FSFATAL) {
146		printf("Fatal error during FAT check\n");
147		goto out;
148	}
149	/* delay writing FATs */
150
151	if (!quiet)
152		printf("** Phase 3 - Checking Directories\n");
153
154	mod |= resetDosDirSection(&boot, fat);
155	finish_dosdirsection = 1;
156	if (mod & FSFATAL) {
157		printf("Fatal error during resetDosDirSection()\n");
158		goto out;
159	}
160	/* delay writing FATs */
161
162	mod |= handleDirTree(dosfs, &boot, fat);
163	if (mod & FSFATAL)
164		goto out;
165
166	if (!quiet)
167		printf("** Phase 4 - Checking for Lost Files\n");
168
169	mod |= checklost(dosfs, &boot, fat);
170	if (mod & FSFATAL)
171		goto out;
172
173	/* now write the FATs */
174	if (mod & FSFATMOD) {
175		if (ask(1, "Update FATs")) {
176			mod |= writefat(dosfs, &boot, fat, mod & FSFIXFAT);
177			if (mod & FSFATAL) {
178				printf("Fatal error during writefat()\n");
179				goto out;
180			}
181		} else
182			mod |= FSERROR;
183	}
184
185	if (boot.NumBad)
186		pwarn("%d files, %d free (%d clusters), %d bad (%d clusters)\n",
187		      boot.NumFiles,
188		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree,
189		      boot.NumBad * boot.ClusterSize / 1024, boot.NumBad);
190	else
191		pwarn("%d files, %d free (%d clusters)\n",
192		      boot.NumFiles,
193		      boot.NumFree * boot.ClusterSize / 1024, boot.NumFree);
194
195	if (mod && (mod & FSERROR) == 0) {
196		if (mod & FSDIRTY) {
197			if (ask(1, "MARK FILE SYSTEM CLEAN") == 0)
198				mod &= ~FSDIRTY;
199
200			if (mod & FSDIRTY) {
201				pwarn("MARKING FILE SYSTEM CLEAN\n");
202				mod |= writefat(dosfs, &boot, fat, 1);
203			} else {
204				pwarn("\n***** FILE SYSTEM IS LEFT MARKED AS DIRTY *****\n");
205				mod |= FSERROR; /* file system not clean */
206			}
207		}
208	}
209
210	if (mod & (FSFATAL | FSERROR))
211		goto out;
212
213	ret = 0;
214
215    out:
216	if (finish_dosdirsection)
217		finishDosDirSection();
218	free(fat);
219	close(dosfs);
220
221	if (mod & (FSFATMOD|FSDIRMOD)) {
222		pwarn("\n***** FILE SYSTEM WAS MODIFIED *****\n");
223		return 4;
224	}
225
226	return ret;
227}
228