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scan_ffs.c revision 1.30 
      1 /* $NetBSD: scan_ffs.c,v 1.30 2015/08/02 18:14:16 dholland Exp $ */
      2 
      3 /*
      4  * Copyright (c) 2005-2007 Juan Romero Pardines
      5  * Copyright (c) 1998 Niklas Hallqvist, Tobias Weingartner
      6  * All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 /*
     30  * Currently it can detect FFS and LFS partitions (version 1 or 2)
     31  * up to 8192/65536 fragsize/blocksize.
     32  */
     33 
     34 #include <sys/cdefs.h>
     35 #ifndef lint
     36 __RCSID("$NetBSD: scan_ffs.c,v 1.30 2015/08/02 18:14:16 dholland Exp $");
     37 #endif /* not lint */
     38 
     39 #include <sys/types.h>
     40 #include <sys/param.h>
     41 #include <sys/disklabel.h>
     42 #include <sys/dkio.h>
     43 #include <sys/ioctl.h>
     44 #include <sys/fcntl.h>
     45 #include <sys/mount.h>
     46 
     47 #include <ufs/lfs/lfs.h>
     48 #include <ufs/lfs/lfs_accessors.h>
     49 #include <ufs/lfs/lfs_extern.h>
     50 
     51 #include <ufs/ufs/dinode.h>
     52 #include <ufs/ffs/fs.h>
     53 
     54 #include <unistd.h>
     55 #include <stdlib.h>
     56 #include <stdio.h>
     57 #include <string.h>
     58 #include <err.h>
     59 #include <util.h>
     60 
     61 #define BLK_CNT		(blk + (n / 512))
     62 
     63 /* common struct for FFS/LFS */
     64 struct sblockinfo {
     65 	struct lfs	*lfs;
     66 	struct fs	*ffs;
     67 	uint64_t	lfs_off;
     68 	uint64_t	ffs_off;
     69 	char		lfs_path[MAXMNTLEN];
     70 	char		ffs_path[MAXMNTLEN];
     71 };
     72 
     73 static daddr_t	blk, lastblk;
     74 
     75 static int	eflag = 0;
     76 static int	fflag = 0;
     77 static int	flags = 0;
     78 static int	sbaddr = 0; /* counter for the LFS superblocks */
     79 
     80 static char	device[MAXPATHLEN];
     81 static const char *fstypes[] = { "NONE", "FFSv1", "FFSv2" };
     82 
     83 #define FSTYPE_NONE	0
     84 #define FSTYPE_FFSV1	1
     85 #define FSTYPE_FFSV2	2
     86 
     87 #define SBCOUNT		128 /* may be changed */
     88 #define SBPASS		(SBCOUNT * SBLOCKSIZE / 512)
     89 
     90 /* This is only useful for LFS */
     91 
     92 /* first sblock address contains the correct offset */
     93 #define FIRST_SBLOCK_ADDRESS    1
     94 /* second and third sblock address contain lfs_fsmnt[MAXMNTLEN] */
     95 #define SECOND_SBLOCK_ADDRESS   2
     96 /* last sblock address in a LFS partition */
     97 #define MAX_SBLOCK_ADDRESS      10
     98 
     99 enum { NADA=0, VERBOSE=1, LABELS=2, BLOCKS=4 };
    100 
    101 /* FFS functions */
    102 static void	ffs_printpart(struct sblockinfo *, int, size_t, int);
    103 static void	ffs_scan(struct sblockinfo *, int);
    104 static int	ffs_checkver(struct sblockinfo *);
    105 /* LFS functions */
    106 static void	lfs_printpart(struct sblockinfo *, int, int);
    107 static void	lfs_scan(struct sblockinfo *, int);
    108 /* common functions */
    109 static void	usage(void) __dead;
    110 static int	scan_disk(int, daddr_t, daddr_t, int);
    111 
    112 static int
    113 ffs_checkver(struct sblockinfo *sbi)
    114 {
    115 	switch (sbi->ffs->fs_magic) {
    116 		case FS_UFS1_MAGIC:
    117 		case FS_UFS1_MAGIC_SWAPPED:
    118 			sbi->ffs->fs_size = sbi->ffs->fs_old_size;
    119 			return FSTYPE_FFSV1;
    120 		case FS_UFS2_MAGIC:
    121 		case FS_UFS2_MAGIC_SWAPPED:
    122 			return FSTYPE_FFSV2;
    123 		default:
    124 			return FSTYPE_NONE;
    125 	}
    126 }
    127 
    128 static void
    129 ffs_printpart(struct sblockinfo *sbi, int flag, size_t ffsize, int n)
    130 {
    131 	int offset, ver;
    132 
    133 	switch (flag) {
    134 	case VERBOSE:
    135 		switch (ffs_checkver(sbi)) {
    136 		case FSTYPE_FFSV1:
    137 			(void)printf("offset: %" PRIu64 " n: %d "
    138 			    "id: %x,%x size: %" PRIu64 "\n",
    139 			    BLK_CNT - (2 * SBLOCKSIZE / 512), n,
    140 			    sbi->ffs->fs_id[0], sbi->ffs->fs_id[1],
    141 			    (uint64_t)sbi->ffs->fs_size *
    142 			    sbi->ffs->fs_fsize / 512);
    143 			break;
    144 		case FSTYPE_FFSV2:
    145 			(void)printf("offset: %" PRIu64 " n: %d "
    146 			    "id: %x,%x size: %" PRIu64 "\n",
    147 			    BLK_CNT - (ffsize * SBLOCKSIZE / 512+128),
    148 			    n, sbi->ffs->fs_id[0], sbi->ffs->fs_id[1],
    149 			    (uint64_t)sbi->ffs->fs_size *
    150 			    sbi->ffs->fs_fsize / 512);
    151 			break;
    152 		default:
    153 			break;
    154 		}
    155 		break;
    156 	case LABELS:
    157 		(void)printf("X:  %9" PRIu64,
    158 			(uint64_t)(sbi->ffs->fs_size *
    159 			sbi->ffs->fs_fsize / 512));
    160 		switch (ffs_checkver(sbi)) {
    161 		case FSTYPE_FFSV1:
    162 			(void)printf(" %9" PRIu64,
    163 			    BLK_CNT - (ffsize * SBLOCKSIZE / 512));
    164 			break;
    165 		case FSTYPE_FFSV2:
    166 			(void)printf(" %9" PRIu64,
    167 			    BLK_CNT - (ffsize * SBLOCKSIZE / 512 + 128));
    168 			break;
    169 		default:
    170 			break;
    171 		}
    172 		(void)printf(" 4.2BSD %6d %5d %7d # %s [%s]\n",
    173 			sbi->ffs->fs_fsize, sbi->ffs->fs_bsize,
    174 			sbi->ffs->fs_old_cpg,
    175 			sbi->ffs_path, fstypes[ffs_checkver(sbi)]);
    176 		break;
    177 	case BLOCKS:
    178 	default:
    179 		(void)printf("%s ", fstypes[ffs_checkver(sbi)]);
    180 		ver = ffs_checkver(sbi);
    181 		if (ver == FSTYPE_NONE)
    182 			break;
    183 
    184 		offset = 0;
    185 		if (flag == BLOCKS)
    186 			(void)printf("sb ");
    187 		else if (ver == FSTYPE_FFSV1)
    188 			offset = (2 * SBLOCKSIZE / 512);
    189 		else if (ver == FSTYPE_FFSV2)
    190 			offset = (ffsize * SBLOCKSIZE / 512 + 128);
    191 
    192 		(void)printf("at %" PRIu64, BLK_CNT - offset);
    193 		(void)printf(" size %" PRIu64 ", last mounted on %s\n",
    194 			(uint64_t)(sbi->ffs->fs_size *
    195 			sbi->ffs->fs_fsize / 512), sbi->ffs_path);
    196 		break;
    197 	}
    198 }
    199 
    200 static void
    201 ffs_scan(struct sblockinfo *sbi, int n)
    202 {
    203 	size_t i = 0;
    204 
    205 	if (flags & BLOCKS) {
    206 		ffs_printpart(sbi, BLOCKS, 0, n);
    207 		return;
    208 	}
    209 	if (flags & VERBOSE)
    210 		ffs_printpart(sbi, VERBOSE, NADA, n);
    211 	switch (ffs_checkver(sbi)) {
    212 	case FSTYPE_FFSV1:
    213 		/* fsize/bsize > 512/4096 and < 4096/32768. */
    214 		if ((BLK_CNT - lastblk) == (SBLOCKSIZE / 512)) {
    215 			i = 2;
    216 		/* fsize/bsize 4096/32768. */
    217 		} else if ((BLK_CNT - lastblk) == (SBLOCKSIZE / 170)) {
    218 			i = 4;
    219 		/* fsize/bsize 8192/65536 */
    220 		} else if ((BLK_CNT - lastblk) == (SBLOCKSIZE / 73)) {
    221 			i = 8;
    222 		} else
    223 			break;
    224 
    225 		if (flags & LABELS)
    226 			ffs_printpart(sbi, LABELS, i, n);
    227 		else
    228 			ffs_printpart(sbi, NADA, i, n);
    229 
    230 		break;
    231 	case FSTYPE_FFSV2:
    232 		/*
    233 		 * That checks for FFSv2 partitions with fragsize/blocksize:
    234 		 * 512/4096, 1024/8192, 2048/16384, 4096/32768 and 8192/65536.
    235 		 * Really enough for now.
    236 		 */
    237 		for (i = 1; i < 16; i <<= 1)
    238 			if ((BLK_CNT - lastblk) == (daddr_t)(i * SBLOCKSIZE / 512)) {
    239 				if (flags & LABELS)
    240 					ffs_printpart(sbi, LABELS, i, n);
    241 				else
    242 					ffs_printpart(sbi, NADA, i, n);
    243 			}
    244 		break;
    245 	}
    246 }
    247 
    248 static void
    249 lfs_printpart(struct sblockinfo *sbi, int flag, int n)
    250 {
    251 	if (flags & VERBOSE)
    252                	(void)printf("offset: %" PRIu64 " size %" PRIu64
    253 			" fsid %" PRIx32 "\n", sbi->lfs_off,
    254 			lfs_sb_getsize(sbi->lfs),
    255 			lfs_sb_getident(sbi->lfs));
    256 	switch (flag) {
    257 	case LABELS:
    258 		(void)printf("X:  %9" PRIu64,
    259                		(lfs_sb_getsize(sbi->lfs) *
    260                		lfs_sb_getfsize(sbi->lfs) / 512));
    261 		(void)printf(" %9" PRIu64, sbi->lfs_off);
    262 		(void)printf(" 4.4LFS %6d %5d %7d # %s [LFSv%d]\n",
    263 			lfs_sb_getfsize(sbi->lfs), lfs_sb_getbsize(sbi->lfs),
    264 			lfs_sb_getnseg(sbi->lfs), sbi->lfs_path,
    265 			lfs_sb_getversion(sbi->lfs));
    266 		break;
    267 	case BLOCKS:
    268 		(void)printf("LFSv%d", lfs_sb_getversion(sbi->lfs));
    269 		(void)printf(" sb at %" PRIu64, sbi->lfs_off + btodb(LFS_LABELPAD));
    270 		(void)printf(" fsid %" PRIx32, lfs_sb_getident(sbi->lfs));
    271 		(void)printf(" size %" PRIu64 ", last mounted on %s\n",
    272 			(lfs_sb_getsize(sbi->lfs) *
    273 			lfs_sb_getfsize(sbi->lfs) / 512), sbi->lfs_path);
    274 		break;
    275 	default:
    276 		(void)printf("LFSv%d ", lfs_sb_getversion(sbi->lfs));
    277 		(void)printf("at %" PRIu64, sbi->lfs_off);
    278 		(void)printf(" size %" PRIu64 ", last mounted on %s\n",
    279 			(lfs_sb_getsize(sbi->lfs) *
    280 			lfs_sb_getfsize(sbi->lfs) / 512), sbi->lfs_path);
    281 		break;
    282 	}
    283 }
    284 
    285 static void
    286 lfs_scan(struct sblockinfo *sbi, int n)
    287 {
    288 	size_t namesize;
    289 
    290 	/* Check to see if the sb checksums correctly */
    291 	if (lfs_sb_cksum(&(sbi->lfs->lfs_dlfs)) != lfs_sb_getcksum(sbi->lfs)) {
    292 		if (flags & VERBOSE)
    293 			printf("LFS bad superblock at %" PRIu64 "\n",
    294 				BLK_CNT);
    295 		return;
    296 	}
    297 
    298 	/* backup offset */
    299 	lastblk = BLK_CNT - (LFS_SBPAD / 512);
    300 	/* increment counter */
    301         ++sbaddr;
    302 
    303 	if (flags & BLOCKS) {
    304 		sbi->lfs_off = BLK_CNT - btodb(LFS_LABELPAD);
    305 		lfs_printpart(sbi, BLOCKS, n);
    306 		return;
    307 	}
    308 
    309 	switch (sbaddr) {
    310 	/*
    311 	 * first superblock contains the right offset, but lfs_fsmnt is
    312 	 * empty... fortunately the next superblock address has it.
    313 	 */
    314 	case FIRST_SBLOCK_ADDRESS:
    315 		/* copy partition offset */
    316 		if ((daddr_t)sbi->lfs_off != lastblk)
    317 			sbi->lfs_off = BLK_CNT - (LFS_LABELPAD / 512);
    318 		break;
    319 	case SECOND_SBLOCK_ADDRESS:
    320 		/* copy the path of last mount */
    321 		namesize = MIN(sizeof(sbi->lfs_path),
    322 			       sizeof(sbi->lfs->lfs_dlfs.dlfs_fsmnt));
    323 		(void)memcpy(sbi->lfs_path, sbi->lfs->lfs_dlfs.dlfs_fsmnt,
    324 			     namesize);
    325 		sbi->lfs_path[namesize - 1] = '\0';
    326 		/* print now that we have the info */
    327 		if (flags & LABELS)
    328 			lfs_printpart(sbi, LABELS, n);
    329 		else
    330 			lfs_printpart(sbi, NADA, n);
    331 		/* clear our struct */
    332 		(void)memset(sbi, 0, sizeof(*sbi));
    333 		break;
    334 	case MAX_SBLOCK_ADDRESS:
    335 		/*
    336 		 * reset the counter, this is the last superblock address,
    337 		 * the next one will be another partition maybe.
    338 		 */
    339 		sbaddr = 0;
    340 		break;
    341 	default:
    342 		break;
    343 	}
    344 }
    345 
    346 static int
    347 scan_disk(int fd, daddr_t beg, daddr_t end, int fflags)
    348 {
    349 	struct sblockinfo sbinfo;
    350 	uint8_t buf[SBLOCKSIZE * SBCOUNT];
    351 	int n;
    352 
    353 	n = 0;
    354 	lastblk = -1;
    355 
    356 	/* clear our struct before using it */
    357 	(void)memset(&sbinfo, 0, sizeof(sbinfo));
    358 
    359 	if (fflags & LABELS)
    360 		(void)printf(
    361 		    "#        size    offset fstype [fsize bsize cpg/sgs]\n");
    362 
    363 	for (blk = beg; blk <= end; blk += SBPASS) {
    364 		if (pread(fd, buf, sizeof(buf), blk * 512) == -1) {
    365 			if (fflag && fd >= 0)
    366 				(void)close(fd);
    367 			err(1, "pread");
    368 		}
    369 
    370 		for (n = 0; n < (SBLOCKSIZE * SBCOUNT); n += 512) {
    371 			sbinfo.ffs = (struct fs *)&buf[n];
    372 			sbinfo.lfs = (struct lfs *)&buf[n];
    373 
    374 			switch (ffs_checkver(&sbinfo)) {
    375 			case FSTYPE_FFSV1:
    376 			case FSTYPE_FFSV2:
    377 				ffs_scan(&sbinfo, n);
    378 				lastblk = BLK_CNT;
    379 				(void)memcpy(sbinfo.ffs_path,
    380 					sbinfo.ffs->fs_fsmnt, MAXMNTLEN);
    381 				break;
    382 			case FSTYPE_NONE:
    383 				/* maybe LFS? */
    384 				if (sbinfo.lfs->lfs_magic == LFS_MAGIC)
    385 					lfs_scan(&sbinfo, n);
    386 				break;
    387 			default:
    388 				break;
    389 			}
    390 		}
    391 	}
    392 
    393 	if (fflag && fd >= 0)
    394 		(void)close(fd);
    395 
    396 	return EXIT_SUCCESS;
    397 }
    398 
    399 
    400 static void
    401 usage(void)
    402 {
    403 	(void)fprintf(stderr,
    404 		"Usage: %s [-blv] [-e end] [-F file] [-s start] "
    405 		"device\n", getprogname());
    406 	exit(EXIT_FAILURE);
    407 }
    408 
    409 
    410 int
    411 main(int argc, char **argv)
    412 {
    413 	int ch, fd;
    414 	const char *fpath;
    415 	daddr_t end = -1, beg = 0;
    416 	struct disklabel dl;
    417 
    418 	fpath = NULL;
    419 
    420 	setprogname(*argv);
    421 	while ((ch = getopt(argc, argv, "be:F:ls:v")) != -1)
    422 		switch(ch) {
    423 		case 'b':
    424 			flags |= BLOCKS;
    425 			flags &= ~LABELS;
    426 			break;
    427 		case 'e':
    428 			eflag = 1;
    429 			end = atoi(optarg);
    430 			break;
    431 		case 'F':
    432 			fflag = 1;
    433 			fpath = optarg;
    434 			break;
    435 		case 'l':
    436 			flags |= LABELS;
    437 			flags &= ~BLOCKS;
    438 			break;
    439 		case 's':
    440 			beg = atoi(optarg);
    441 			break;
    442 		case 'v':
    443 			flags |= VERBOSE;
    444 			break;
    445 		default:
    446 			usage();
    447 			/* NOTREACHED */
    448 		}
    449 
    450 	argc -= optind;
    451 	argv += optind;
    452 
    453 	if (fflag) {
    454 		struct stat stp;
    455 
    456 		if (stat(fpath, &stp))
    457 			err(1, "Cannot stat `%s'", fpath);
    458 
    459 		if (!eflag)
    460 			end = (uint64_t)stp.st_size;
    461 
    462 		(void)printf("Total file size: %" PRIu64 "\n\n",
    463 		    (uint64_t)stp.st_size);
    464 
    465 		fd = open(fpath, O_RDONLY | O_DIRECT);
    466 	} else {
    467 		if (argc != 1)
    468 			usage();
    469 
    470 		fd = opendisk(argv[0], O_RDONLY, device, sizeof(device), 0);
    471 
    472 		if (ioctl(fd, DIOCGDINFO, &dl) == -1) {
    473 			warn("Couldn't retrieve disklabel");
    474 			(void)memset(&dl, 0, sizeof(dl));
    475 			dl.d_secperunit = 0x7fffffff;
    476 		} else {
    477 			(void)printf("Disk: %s\n", dl.d_typename);
    478 			(void)printf("Total sectors on disk: %" PRIu32 "\n\n",
    479 			    dl.d_secperunit);
    480 		}
    481 	}
    482 
    483 	if (!eflag && !fflag)
    484 		end = dl.d_secperunit; /* default to max sectors */
    485 
    486 	if (fd == -1)
    487 		err(1, "Cannot open `%s'", device);
    488 		/* NOTREACHED */
    489 
    490 	return scan_disk(fd, beg, end, flags);
    491 }
    492