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      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 $");
     37 static const char rcsid[] =
     38   "$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 
     58 int
     59 checkfilesys(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