xref: /illumos-gate/usr/src/cmd/fs.d/pcfs/fsck/fsck.c (revision 7c478bd9)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright (c) 1999,2001 by Sun Microsystems, Inc.
24  * All rights reserved.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 /*
30  * fsck_pcfs -- main routines.
31  */
32 
33 #include <stdio.h>
34 #include <errno.h>
35 #include <stdlib.h>
36 #include <sys/types.h>
37 #include <sys/stat.h>
38 #include <fcntl.h>
39 #include <strings.h>
40 #include <libintl.h>
41 #include <locale.h>
42 #include <sys/fcntl.h>
43 #include <sys/dktp/fdisk.h>
44 #include "pcfs_common.h"
45 #include "fsck_pcfs.h"
46 #include "pcfs_bpb.h"
47 
48 int32_t BytesPerCluster;
49 int32_t TotalClusters;
50 int32_t LastCluster;
51 off64_t	FirstClusterOffset;
52 off64_t	PartitionOffset;
53 bpb_t	TheBIOSParameterBlock;
54 
55 /*
56  * {Output,Input}Image are the file names where we should write the
57  * checked fs image and from which we should read the initial fs.
58  * The image capability is designed for debugging purposes.
59  */
60 static char	*OutputImage = NULL;
61 static char	*InputImage = NULL;
62 static int	WritableOnly = 0; /* -o w, check writable fs' only */
63 static int	Mflag = 0;	  /* -m, sanity check if fs is mountable */
64 static int	Preen = 0;	  /* -o p, preen; non-interactive */
65 /*
66  * By default be quick; skip verify reads.
67  * If the user wants more exhaustive checking,
68  * they should run with the -o v option.
69  */
70 static int	Quick = 1;
71 
72 int	ReadOnly = 0;
73 int	IsFAT32 = 0;
74 int	Verbose = 0;
75 
76 int	AlwaysYes = 0;	/* -y or -Y, assume a yes answer to all questions */
77 int	AlwaysNo = 0;	/* -n or -N, assume a no answer to all questions */
78 
79 extern	ClusterContents	TheRootDir;
80 
81 /*
82  * Function definitions
83  */
84 static void
passOne(int fd)85 passOne(int fd)
86 {
87 	if (!Quick)
88 		findBadClusters(fd);
89 	scanAndFixMetadata(fd);
90 }
91 
92 static void
writeBackChanges(int fd)93 writeBackChanges(int fd)
94 {
95 	writeFATMods(fd);
96 	if (!IsFAT32)
97 		writeRootDirMods(fd);
98 	writeClusterMods(fd);
99 }
100 
101 static void
tryOpen(int * fd,char * openMe,int oflag,int exitOnFailure)102 tryOpen(int *fd, char *openMe, int oflag, int exitOnFailure)
103 {
104 	int saveError;
105 
106 	if ((*fd = open(openMe, oflag)) < 0) {
107 		if (exitOnFailure == RETURN_ON_OPEN_FAILURE)
108 			return;
109 		saveError = errno;
110 		mountSanityCheckFails();
111 		(void) fprintf(stderr, "%s: ", openMe);
112 		(void) fprintf(stderr, strerror(saveError));
113 		(void) fprintf(stderr, "\n");
114 		exit(1);
115 	}
116 }
117 
118 static void
doOpen(int * inFD,int * outFD,char * name,char * outName)119 doOpen(int *inFD, int *outFD, char *name, char *outName)
120 {
121 	if (ReadOnly) {
122 		tryOpen(inFD, name, O_RDONLY, EXIT_ON_OPEN_FAILURE);
123 		*outFD = -1;
124 	} else {
125 		tryOpen(inFD, name, O_RDWR, RETURN_ON_OPEN_FAILURE);
126 		if (*inFD < 0) {
127 			if (errno != EACCES || WritableOnly) {
128 				int saveError = errno;
129 				mountSanityCheckFails();
130 				(void) fprintf(stderr,
131 				    gettext("%s: "), name);
132 				(void) fprintf(stderr, strerror(saveError));
133 				(void) fprintf(stderr, "\n");
134 				exit(2);
135 			} else {
136 				tryOpen(inFD, name, O_RDONLY,
137 				    EXIT_ON_OPEN_FAILURE);
138 				AlwaysYes = 0;
139 				AlwaysNo = 1;
140 				ReadOnly = 1;
141 				*outFD = -1;
142 			}
143 		} else {
144 			*outFD = *inFD;
145 		}
146 	}
147 
148 	if (outName != NULL) {
149 		tryOpen(outFD, outName, (O_RDWR | O_CREAT),
150 		    EXIT_ON_OPEN_FAILURE);
151 	}
152 
153 	(void) printf("** %s %s\n", name,
154 	    ReadOnly ? gettext("(NO WRITE)") : "");
155 }
156 
157 static void
openFS(char * special,int * inFD,int * outFD)158 openFS(char *special, int *inFD, int *outFD)
159 {
160 	struct stat dinfo;
161 	char *actualDisk = NULL;
162 	char *suffix = NULL;
163 
164 	if (Verbose)
165 		(void) fprintf(stderr, gettext("Opening file system.\n"));
166 
167 	if (InputImage == NULL) {
168 		actualDisk = stat_actual_disk(special, &dinfo, &suffix);
169 		/*
170 		 *  Destination exists, now find more about it.
171 		 */
172 		if (!(S_ISCHR(dinfo.st_mode))) {
173 			mountSanityCheckFails();
174 			(void) fprintf(stderr,
175 			    gettext("\n%s: device name must be a "
176 			    "character special device.\n"), actualDisk);
177 			exit(2);
178 		}
179 	} else {
180 		actualDisk = InputImage;
181 	}
182 	doOpen(inFD, outFD, actualDisk, OutputImage);
183 	if (suffix) {
184 		if ((PartitionOffset =
185 		    findPartitionOffset(*inFD, suffix)) < 0) {
186 			mountSanityCheckFails();
187 			(void) fprintf(stderr,
188 			    gettext("Unable to find logical drive %s\n"),
189 			    suffix);
190 			exit(2);
191 		} else if (Verbose) {
192 			(void) fprintf(stderr,
193 			    gettext("Partition starts at offset %lld\n"),
194 			    PartitionOffset);
195 		}
196 	} else {
197 		PartitionOffset = 0;
198 	}
199 }
200 
201 void
usage()202 usage()
203 {
204 	(void) fprintf(stderr,
205 		gettext("pcfs Usage: fsck -F pcfs [-o v|p|w] special-file\n"));
206 	exit(1);
207 }
208 
209 static
210 char *LegalOpts[] = {
211 #define	VFLAG 0
212 	"v",
213 #define	PFLAG 1
214 	"p",
215 #define	WFLAG 2
216 	"w",
217 #define	DFLAG 3
218 	"d",
219 #define	IFLAG 4
220 	"i",
221 #define	OFLAG 5
222 	"o",
223 	NULL
224 };
225 
226 static void
parseSubOptions(char * optsstr)227 parseSubOptions(char *optsstr)
228 {
229 	char *value;
230 	int c;
231 
232 	while (*optsstr != '\0') {
233 		switch (c = getsubopt(&optsstr, LegalOpts, &value)) {
234 		case VFLAG:
235 			Quick = 0;
236 			break;
237 		case PFLAG:
238 			Preen++;
239 			break;
240 		case WFLAG:
241 			WritableOnly++;
242 			break;
243 		case DFLAG:
244 			Verbose++;
245 			break;
246 		case IFLAG:
247 			if (value == NULL) {
248 				missing_arg(LegalOpts[c]);
249 			} else {
250 				InputImage = value;
251 			}
252 			break;
253 		case OFLAG:
254 			if (value == NULL) {
255 				missing_arg(LegalOpts[c]);
256 			} else {
257 				OutputImage = value;
258 			}
259 			break;
260 		default:
261 			bad_arg(value);
262 			break;
263 		}
264 	}
265 }
266 
267 static void
sanityCheckOpts(void)268 sanityCheckOpts(void)
269 {
270 	if (WritableOnly && ReadOnly) {
271 		(void) fprintf(stderr,
272 		    gettext("-w option may not be used with the -n "
273 		    "or -m options\n"));
274 		exit(4);
275 	}
276 }
277 
278 static void
confirmMountable(char * special,int fd)279 confirmMountable(char *special, int fd)
280 {
281 	char *printName;
282 	int okayToMount = 1;
283 
284 	printName = InputImage ? InputImage : special;
285 
286 	if (!IsFAT32) {
287 		/* make sure we can at least read the root directory */
288 		getRootDirectory(fd);
289 		if (TheRootDir.bytes == NULL)
290 			okayToMount = 0;
291 	} else {
292 		/* check the bit designed into FAT32 for this purpose */
293 		okayToMount = checkFAT32CleanBit(fd);
294 	}
295 	if (okayToMount) {
296 		(void) fprintf(stderr,
297 		    gettext("pcfs fsck: sanity check: %s okay\n"), printName);
298 		exit(0);
299 	} else {
300 		(void) fprintf(stderr,
301 		    gettext("pcfs fsck: sanity check: %s needs checking\n"),
302 		    printName);
303 		exit(32);
304 	}
305 }
306 
307 void
mountSanityCheckFails(void)308 mountSanityCheckFails(void)
309 {
310 	if (Mflag) {
311 		(void) fprintf(stderr,
312 		    gettext("pcfs fsck: sanity check failed: "));
313 	}
314 }
315 
316 /*
317  * preenBail
318  *	Routine that other routines can call if they would go into a
319  *	state where they need user input.  They can send an optional
320  *	message string to be printed before the exit.  Caller should
321  *	send a NULL string if they don't have an exit message.
322  */
323 void
preenBail(char * outString)324 preenBail(char *outString)
325 {
326 	/*
327 	 *  If we are running in the 'preen' mode, we got here because
328 	 *  we reached a situation that would require user intervention.
329 	 *  We have no choice but to bail at this point.
330 	 */
331 	if (Preen) {
332 		if (outString)
333 			(void) printf("%s", outString);
334 		(void) printf(gettext("FILE SYSTEM FIX REQUIRES USER "
335 		    "INTERVENTION; RUN fsck MANUALLY.\n"));
336 		exit(36);
337 	}
338 }
339 
340 int
main(int argc,char * argv[])341 main(int argc, char *argv[])
342 {
343 	char *string;
344 	int  ifd, ofd;
345 	int  c;
346 
347 	(void) setlocale(LC_ALL, "");
348 
349 #if !defined(TEXT_DOMAIN)
350 #define	TEXT_DOMAIN "SYS_TEST"
351 #endif
352 	(void) textdomain(TEXT_DOMAIN);
353 
354 	if (argc < 2)
355 		usage();
356 
357 	while ((c = getopt(argc, argv, "F:VYNynmo:")) != EOF) {
358 		switch (c) {
359 		case 'F':
360 			string = optarg;
361 			if (strcmp(string, "pcfs") != 0)
362 				usage();
363 			break;
364 		case 'V': {
365 				char	*opt_text;
366 				int	opt_count;
367 
368 				(void) printf(gettext("fsck -F pcfs "));
369 				for (opt_count = 1; opt_count < argc;
370 				    opt_count++) {
371 					opt_text = argv[opt_count];
372 					if (opt_text)
373 						(void) printf(" %s ",
374 						    opt_text);
375 				}
376 				(void) printf("\n");
377 				exit(0);
378 			}
379 			break;
380 		case 'N':
381 		case 'n':
382 			AlwaysYes = 0;
383 			AlwaysNo = 1;
384 			ReadOnly = 1;
385 			break;
386 		case 'Y':
387 		case 'y':
388 			AlwaysYes = 1;
389 			AlwaysNo = 0;
390 			break;
391 		case 'm':
392 			Mflag++;
393 			ReadOnly = 1;
394 			break;
395 		case 'o':
396 			string = optarg;
397 			parseSubOptions(string);
398 			break;
399 		}
400 	}
401 
402 	sanityCheckOpts();
403 	if (InputImage == NULL && (optind < 0 || optind >= argc))
404 		usage();
405 
406 	openFS(argv[optind], &ifd, &ofd);
407 	readBPB(ifd);
408 
409 	/*
410 	 * -m mountable fs check.  This call will not return.
411 	 */
412 	if (Mflag)
413 		confirmMountable(argv[optind], ifd);
414 
415 	/*
416 	 *  Pass 1: Find any bad clusters and adjust the FAT and directory
417 	 *	entries accordingly
418 	 */
419 	passOne(ifd);
420 
421 	/*
422 	 *  XXX - future passes?
423 	 *	Ideas:
424 	 *	    Data relocation for bad clusters with partial read success?
425 	 *	    Syncing backup FAT copies with main copy?
426 	 *	    Syncing backup root sector for FAT32?
427 	 */
428 
429 	/*
430 	 *  No problems if we made it this far.
431 	 */
432 	printSummary(stdout);
433 	writeBackChanges(ofd);
434 	return (0);
435 }
436