Adding upstream version 2.38.1.upstream/2.38.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 733 insertions, 0 deletions

diff --git a/disk-utils/fsck.cramfs.c b/disk-utils/fsck.cramfs.c
new file mode 100644
index 0000000..9b7e2a9
--- /dev/null
+++ b/disk-utils/fsck.cramfs.c
@@ -0,0 +1,733 @@
+/*
+ * cramfsck - check a cramfs file system
+ *
+ * Copyright (C) 2000-2002 Transmeta Corporation
+ *               2005 Adrian Bunk
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * 1999/12/03: Linus Torvalds (cramfs tester and unarchive program)
+ * 2000/06/03: Daniel Quinlan (CRC and length checking program)
+ * 2000/06/04: Daniel Quinlan (merged programs, added options, support
+ *                            for special files, preserve permissions and
+ *                            ownership, cramfs superblock v2, bogus mode
+ *                            test, pathname length test, etc.)
+ * 2000/06/06: Daniel Quinlan (support for holes, pretty-printing,
+ *                            symlink size test)
+ * 2000/07/11: Daniel Quinlan (file length tests, start at offset 0 or 512,
+ *                            fsck-compatible exit codes)
+ * 2000/07/15: Daniel Quinlan (initial support for block devices)
+ * 2002/01/10: Daniel Quinlan (additional checks, test more return codes,
+ *                            use read if mmap fails, standardize messages)
+ */
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <getopt.h>
+#include <fcntl.h>
+
+/* We don't use our include/crc32.h, but crc32 from zlib!
+ *
+ * The zlib implementation performs pre/post-conditioning. The util-linux
+ * imlemenation requires post-conditioning (xor) in the applications.
+ */
+#include <zlib.h>
+
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+
+#include "c.h"
+#include "cramfs.h"
+#include "nls.h"
+#include "blkdev.h"
+#include "exitcodes.h"
+#include "strutils.h"
+#include "closestream.h"
+
+#define XALLOC_EXIT_CODE FSCK_EX_ERROR
+#include "xalloc.h"
+
+static int fd;			/* ROM image file descriptor */
+static char *filename;		/* ROM image filename */
+static struct cramfs_super super;	/* just find the cramfs superblock once */
+static int cramfs_is_big_endian = 0;	/* source is big endian */
+static int opt_verbose = 0;	/* 1 = verbose (-v), 2+ = very verbose (-vv) */
+static int opt_extract = 0;	/* extract cramfs (-x) */
+static char *extract_dir = "";		/* optional extraction directory (-x) */
+
+#define PAD_SIZE 512
+
+static uid_t euid;		/* effective UID */
+
+/* (cramfs_super + start) <= start_dir < end_dir <= start_data <= end_data */
+static unsigned long start_dir = ~0UL;	/* start of first non-root inode */
+static unsigned long end_dir = 0;	/* end of the directory structure */
+static unsigned long start_data = ~0UL;	/* start of the data (256 MB = max) */
+static unsigned long end_data = 0;	/* end of the data */
+
+
+/* Guarantee access to at least 2 * blksize at a time */
+#define CRAMFS_ROMBUFFER_BITS	13
+#define CRAMFS_ROMBUFFERSIZE	(1 << CRAMFS_ROMBUFFER_BITS)
+#define CRAMFS_ROMBUFFERMASK	(CRAMFS_ROMBUFFERSIZE - 1)
+
+/* Defaults, updated in main() according to block size */
+static size_t rombufbits = CRAMFS_ROMBUFFER_BITS;
+static size_t rombufsize = CRAMFS_ROMBUFFERSIZE;
+static size_t rombufmask = CRAMFS_ROMBUFFERMASK;
+
+static char *read_buffer;
+static unsigned long read_buffer_block = ~0UL;
+
+static z_stream stream;
+
+/* Prototypes */
+static void expand_fs(char *, struct cramfs_inode *);
+
+static char *outbuffer;
+
+static size_t blksize = 0;
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+	FILE *out = stdout;
+
+	fputs(USAGE_HEADER, out);
+	fprintf(out,
+		_(" %s [options] <file>\n"), program_invocation_short_name);
+
+	fputs(USAGE_SEPARATOR, out);
+	fputs(_("Check and repair a compressed ROM filesystem.\n"), out);
+
+	fputs(USAGE_OPTIONS, out);
+	fputs(_(" -a                       for compatibility only, ignored\n"), out);
+	fputs(_(" -v, --verbose            be more verbose\n"), out);
+	fputs(_(" -y                       for compatibility only, ignored\n"), out);
+	fputs(_(" -b, --blocksize <size>   use this blocksize, defaults to page size\n"), out);
+	fputs(_("     --extract[=<dir>]    test uncompression, optionally extract into <dir>\n"), out);
+	fputs(USAGE_SEPARATOR, out);
+	printf(USAGE_HELP_OPTIONS(26));
+
+	printf(USAGE_MAN_TAIL("fsck.cramfs(8)"));
+	exit(FSCK_EX_OK);
+}
+
+static int get_superblock_endianness(uint32_t magic)
+{
+	if (magic == CRAMFS_MAGIC) {
+		cramfs_is_big_endian = HOST_IS_BIG_ENDIAN;
+		return 0;
+	}
+
+	if (magic ==
+		   u32_toggle_endianness(!HOST_IS_BIG_ENDIAN, CRAMFS_MAGIC)) {
+		cramfs_is_big_endian = !HOST_IS_BIG_ENDIAN;
+		return 0;
+	}
+
+	return -1;
+}
+
+static void test_super(int *start, size_t * length)
+{
+	struct stat st;
+
+
+	fd = open(filename, O_RDONLY);
+	if (fd < 0)
+		err(FSCK_EX_ERROR, _("cannot open %s"), filename);
+
+	/* find the physical size of the file or block device */
+	if (fstat(fd, &st) < 0)
+		err(FSCK_EX_ERROR, _("stat of %s failed"), filename);
+
+	if (S_ISBLK(st.st_mode)) {
+		unsigned long long bytes;
+		if (blkdev_get_size(fd, &bytes))
+			err(FSCK_EX_ERROR,
+			    _("ioctl failed: unable to determine device size: %s"),
+			    filename);
+		*length = bytes;
+	} else if (S_ISREG(st.st_mode))
+		*length = st.st_size;
+	else
+		errx(FSCK_EX_ERROR, _("not a block device or file: %s"), filename);
+
+	if (*length < sizeof(struct cramfs_super))
+		errx(FSCK_EX_UNCORRECTED, _("file length too short"));
+
+	/* find superblock */
+	if (read(fd, &super, sizeof(super)) != sizeof(super))
+		err(FSCK_EX_ERROR, _("cannot read %s"), filename);
+	if (get_superblock_endianness(super.magic) != -1)
+		*start = 0;
+	else if (*length >= (PAD_SIZE + sizeof(super))) {
+		if (lseek(fd, PAD_SIZE, SEEK_SET) == (off_t) -1)
+			err(FSCK_EX_ERROR, _("seek on %s failed"), filename);
+		if (read(fd, &super, sizeof(super)) != sizeof(super))
+			err(FSCK_EX_ERROR, _("cannot read %s"), filename);
+		if (get_superblock_endianness(super.magic) != -1)
+			*start = PAD_SIZE;
+		else
+			errx(FSCK_EX_UNCORRECTED, _("superblock magic not found"));
+	} else
+		errx(FSCK_EX_UNCORRECTED, _("superblock magic not found"));
+
+	if (opt_verbose)
+		printf(_("cramfs endianness is %s\n"),
+		       cramfs_is_big_endian ? _("big") : _("little"));
+
+	super_toggle_endianness(cramfs_is_big_endian, &super);
+	if (super.flags & ~CRAMFS_SUPPORTED_FLAGS)
+		errx(FSCK_EX_ERROR, _("unsupported filesystem features"));
+
+	/* What are valid superblock sizes? */
+	if (super.size < *start + sizeof(struct cramfs_super))
+		errx(FSCK_EX_UNCORRECTED, _("superblock size (%d) too small"),
+		     super.size);
+
+	if (super.flags & CRAMFS_FLAG_FSID_VERSION_2) {
+		if (super.fsid.files == 0)
+			errx(FSCK_EX_UNCORRECTED, _("zero file count"));
+		if (*length < super.size)
+			errx(FSCK_EX_UNCORRECTED, _("file length too short"));
+		else if (*length > super.size)
+			warnx(_("file extends past end of filesystem"));
+	} else
+		warnx(_("old cramfs format"));
+}
+
+static void test_crc(int start)
+{
+	void *buf;
+	uint32_t crc;
+
+	if (!(super.flags & CRAMFS_FLAG_FSID_VERSION_2)) {
+		warnx(_("unable to test CRC: old cramfs format"));
+		return;
+	}
+
+	crc = crc32(0L, NULL, 0);
+
+	buf =
+	    mmap(NULL, super.size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+	if (buf == MAP_FAILED) {
+		buf =
+		    mmap(NULL, super.size, PROT_READ | PROT_WRITE,
+			 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+		if (buf != MAP_FAILED) {
+			ssize_t tmp;
+			if (lseek(fd, 0, SEEK_SET) == (off_t) -1)
+				err(FSCK_EX_ERROR, _("seek on %s failed"), filename);
+			tmp = read(fd, buf, super.size);
+			if (tmp < 0)
+				err(FSCK_EX_ERROR, _("cannot read %s"), filename);
+			if (tmp != (ssize_t) super.size)
+				errx(FSCK_EX_ERROR, _("failed to read %"PRIu32" bytes from file %s"),
+					super.size, filename);
+		}
+	}
+	if (buf != MAP_FAILED) {
+		((struct cramfs_super *)((unsigned char *) buf + start))->fsid.crc =
+		    crc32(0L, NULL, 0);
+		crc = crc32(crc, (unsigned char *) buf + start, super.size - start);
+		munmap(buf, super.size);
+	} else {
+		int retval;
+		size_t length = 0;
+
+		buf = xmalloc(4096);
+		if (lseek(fd, start, SEEK_SET) == (off_t) -1)
+			err(FSCK_EX_ERROR, _("seek on %s failed"), filename);
+		for (;;) {
+			retval = read(fd, buf, 4096);
+			if (retval < 0)
+				err(FSCK_EX_ERROR, _("cannot read %s"), filename);
+			else if (retval == 0)
+				break;
+			if (length == 0)
+				((struct cramfs_super *)buf)->fsid.crc =
+				    crc32(0L, NULL, 0);
+			length += retval;
+			if (length > (super.size - start)) {
+				crc = crc32(crc, buf,
+					  retval - (length -
+						    (super.size - start)));
+				break;
+			}
+			crc = crc32(crc, buf, retval);
+		}
+		free(buf);
+	}
+
+	if (crc != super.fsid.crc)
+		errx(FSCK_EX_UNCORRECTED, _("crc error"));
+}
+
+static void print_node(char type, struct cramfs_inode *i, char *name)
+{
+	char info[10];
+
+	if (S_ISCHR(i->mode) || (S_ISBLK(i->mode)))
+		/* major/minor numbers can be as high as 2^12 or 4096 */
+		snprintf(info, 10, "%4d,%4d", major(i->size), minor(i->size));
+	else
+		/* size be as high as 2^24 or 16777216 */
+		snprintf(info, 10, "%9d", i->size);
+
+	printf("%c %04o %s %5d:%-3d %s\n",
+	       type, i->mode & ~S_IFMT, info, i->uid, i->gid,
+	       !*name && type == 'd' ? "/" : name);
+}
+
+/*
+ * Create a fake "blocked" access
+ */
+static void *romfs_read(unsigned long offset)
+{
+	unsigned int block = offset >> rombufbits;
+	if (block != read_buffer_block) {
+		ssize_t x;
+
+		read_buffer_block = block;
+		if (lseek(fd, block << rombufbits, SEEK_SET) == (off_t) -1)
+			warn(_("seek failed"));
+
+		x = read(fd, read_buffer, rombufsize * 2);
+		if (x < 0)
+			warn(_("read romfs failed"));
+	}
+	return read_buffer + (offset & rombufmask);
+}
+
+static struct cramfs_inode *cramfs_iget(struct cramfs_inode *i)
+{
+	struct cramfs_inode *inode = xmalloc(sizeof(struct cramfs_inode));
+
+	inode_to_host(cramfs_is_big_endian, i, inode);
+	return inode;
+}
+
+static struct cramfs_inode *iget(unsigned int ino)
+{
+	return cramfs_iget(romfs_read(ino));
+}
+
+static void iput(struct cramfs_inode *inode)
+{
+	free(inode);
+}
+
+/*
+ * Return the offset of the root directory
+ */
+static struct cramfs_inode *read_super(void)
+{
+	struct cramfs_inode *root = cramfs_iget(&super.root);
+	unsigned long offset = root->offset << 2;
+
+	if (!S_ISDIR(root->mode))
+		errx(FSCK_EX_UNCORRECTED, _("root inode is not directory"));
+	if (!(super.flags & CRAMFS_FLAG_SHIFTED_ROOT_OFFSET) &&
+	    ((offset != sizeof(struct cramfs_super)) &&
+	     (offset != PAD_SIZE + sizeof(struct cramfs_super)))) {
+		errx(FSCK_EX_UNCORRECTED, _("bad root offset (%lu)"), offset);
+	}
+	return root;
+}
+
+static int uncompress_block(void *src, size_t len)
+{
+	int err;
+
+	stream.next_in = src;
+	stream.avail_in = len;
+
+	stream.next_out = (unsigned char *)outbuffer;
+	stream.avail_out = blksize * 2;
+
+	inflateReset(&stream);
+
+	if (len > blksize * 2)
+		errx(FSCK_EX_UNCORRECTED, _("data block too large"));
+
+	err = inflate(&stream, Z_FINISH);
+	if (err != Z_STREAM_END)
+		errx(FSCK_EX_UNCORRECTED, _("decompression error: %s"),
+		     zError(err));
+	return stream.total_out;
+}
+
+#ifndef HAVE_LCHOWN
+#define lchown chown
+#endif
+
+static void do_uncompress(char *path, int outfd, unsigned long offset,
+			  unsigned long size)
+{
+	unsigned long curr = offset + 4 * ((size + blksize - 1) / blksize);
+
+	do {
+		unsigned long out = blksize;
+		unsigned long next = u32_toggle_endianness(cramfs_is_big_endian,
+							   *(uint32_t *)
+							   romfs_read(offset));
+
+		if (next > end_data)
+			end_data = next;
+
+		offset += 4;
+		if (curr == next) {
+			if (opt_verbose > 1)
+				printf(_("  hole at %lu (%zu)\n"), curr,
+				       blksize);
+			if (size < blksize)
+				out = size;
+			memset(outbuffer, 0x00, out);
+		} else {
+			if (opt_verbose > 1)
+				printf(_("  uncompressing block at %lu to %lu (%lu)\n"),
+				       curr, next, next - curr);
+			out = uncompress_block(romfs_read(curr), next - curr);
+		}
+		if (size >= blksize) {
+			if (out != blksize)
+				errx(FSCK_EX_UNCORRECTED,
+				     _("non-block (%ld) bytes"), out);
+		} else {
+			if (out != size)
+				errx(FSCK_EX_UNCORRECTED,
+				     _("non-size (%ld vs %ld) bytes"), out,
+				     size);
+		}
+		size -= out;
+		if (*extract_dir != '\0' && write(outfd, outbuffer, out) < 0)
+			err(FSCK_EX_ERROR, _("write failed: %s"), path);
+		curr = next;
+	} while (size);
+}
+static void change_file_status(char *path, struct cramfs_inode *i)
+{
+	const struct timeval epoch[] = { {0,0}, {0,0} };
+
+	if (euid == 0) {
+		if (lchown(path, i->uid, i->gid) < 0)
+			err(FSCK_EX_ERROR, _("lchown failed: %s"), path);
+		if (S_ISLNK(i->mode))
+			return;
+		if (((S_ISUID | S_ISGID) & i->mode) && chmod(path, i->mode) < 0)
+			err(FSCK_EX_ERROR, _("chown failed: %s"), path);
+	}
+	if (S_ISLNK(i->mode))
+		return;
+	if (utimes(path, epoch) < 0)
+		err(FSCK_EX_ERROR, _("utimes failed: %s"), path);
+}
+
+static void do_directory(char *path, struct cramfs_inode *i)
+{
+	int pathlen = strlen(path);
+	int count = i->size;
+	unsigned long offset = i->offset << 2;
+	char *newpath = xmalloc(pathlen + 256);
+
+	if (offset == 0 && count != 0)
+		errx(FSCK_EX_UNCORRECTED,
+		     _("directory inode has zero offset and non-zero size: %s"),
+		     path);
+
+	if (offset != 0 && offset < start_dir)
+		start_dir = offset;
+
+	/* TODO: Do we need to check end_dir for empty case? */
+	memcpy(newpath, path, pathlen);
+	newpath[pathlen] = '/';
+	pathlen++;
+	if (opt_verbose)
+		print_node('d', i, path);
+
+	if (*extract_dir != '\0') {
+		if (mkdir(path, i->mode) < 0)
+			err(FSCK_EX_ERROR, _("mkdir failed: %s"), path);
+		change_file_status(path, i);
+	}
+	while (count > 0) {
+		struct cramfs_inode *child = iget(offset);
+		int size;
+		int newlen = child->namelen << 2;
+
+		size = sizeof(struct cramfs_inode) + newlen;
+		count -= size;
+
+		offset += sizeof(struct cramfs_inode);
+
+		memcpy(newpath + pathlen, romfs_read(offset), newlen);
+		newpath[pathlen + newlen] = 0;
+		if (newlen == 0)
+			errx(FSCK_EX_UNCORRECTED, _("filename length is zero"));
+		if ((pathlen + newlen) - strlen(newpath) > 3)
+			errx(FSCK_EX_UNCORRECTED, _("bad filename length"));
+		expand_fs(newpath, child);
+
+		offset += newlen;
+
+		if (offset <= start_dir)
+			errx(FSCK_EX_UNCORRECTED, _("bad inode offset"));
+		if (offset > end_dir)
+			end_dir = offset;
+		iput(child);	/* free(child) */
+	}
+	free(newpath);
+}
+
+static void do_file(char *path, struct cramfs_inode *i)
+{
+	unsigned long offset = i->offset << 2;
+	int outfd = 0;
+
+	if (offset == 0 && i->size != 0)
+		errx(FSCK_EX_UNCORRECTED,
+		     _("file inode has zero offset and non-zero size"));
+	if (i->size == 0 && offset != 0)
+		errx(FSCK_EX_UNCORRECTED,
+		     _("file inode has zero size and non-zero offset"));
+	if (offset != 0 && offset < start_data)
+		start_data = offset;
+	if (opt_verbose)
+		print_node('f', i, path);
+	if (*extract_dir != '\0') {
+		outfd = open(path, O_WRONLY | O_CREAT | O_TRUNC, i->mode);
+		if (outfd < 0)
+			err(FSCK_EX_ERROR, _("cannot open %s"), path);
+	}
+	if (i->size)
+		do_uncompress(path, outfd, offset, i->size);
+	if ( *extract_dir != '\0') {
+		if (close_fd(outfd) != 0)
+			err(FSCK_EX_ERROR, _("write failed: %s"), path);
+		change_file_status(path, i);
+	}
+}
+
+static void do_symlink(char *path, struct cramfs_inode *i)
+{
+	unsigned long offset = i->offset << 2;
+	unsigned long curr = offset + 4;
+	unsigned long next =
+	    u32_toggle_endianness(cramfs_is_big_endian,
+				  *(uint32_t *) romfs_read(offset));
+	unsigned long size;
+
+	if (offset == 0)
+		errx(FSCK_EX_UNCORRECTED, _("symbolic link has zero offset"));
+	if (i->size == 0)
+		errx(FSCK_EX_UNCORRECTED, _("symbolic link has zero size"));
+
+	if (offset < start_data)
+		start_data = offset;
+	if (next > end_data)
+		end_data = next;
+
+	size = uncompress_block(romfs_read(curr), next - curr);
+	if (size != i->size)
+		errx(FSCK_EX_UNCORRECTED, _("size error in symlink: %s"), path);
+	outbuffer[size] = 0;
+	if (opt_verbose) {
+		char *str;
+
+		xasprintf(&str, "%s -> %s", path, outbuffer);
+		print_node('l', i, str);
+		if (opt_verbose > 1)
+			printf(_("  uncompressing block at %lu to %lu (%lu)\n"),
+			       curr, next, next - curr);
+		free(str);
+	}
+	if (*extract_dir != '\0') {
+		if (symlink(outbuffer, path) < 0)
+			err(FSCK_EX_ERROR, _("symlink failed: %s"), path);
+		change_file_status(path, i);
+	}
+}
+
+static void do_special_inode(char *path, struct cramfs_inode *i)
+{
+	dev_t devtype = 0;
+	char type;
+
+	if (i->offset)
+		/* no need to shift offset */
+		errx(FSCK_EX_UNCORRECTED,
+		     _("special file has non-zero offset: %s"), path);
+
+	if (S_ISCHR(i->mode)) {
+		devtype = i->size;
+		type = 'c';
+	} else if (S_ISBLK(i->mode)) {
+		devtype = i->size;
+		type = 'b';
+	} else if (S_ISFIFO(i->mode)) {
+		if (i->size != 0)
+			errx(FSCK_EX_UNCORRECTED, _("fifo has non-zero size: %s"),
+			     path);
+		type = 'p';
+	} else if (S_ISSOCK(i->mode)) {
+		if (i->size != 0)
+			errx(FSCK_EX_UNCORRECTED,
+			     _("socket has non-zero size: %s"), path);
+		type = 's';
+	} else {
+		errx(FSCK_EX_UNCORRECTED, _("bogus mode: %s (%o)"), path, i->mode);
+		return;		/* not reached */
+	}
+
+	if (opt_verbose)
+		print_node(type, i, path);
+
+	if (*extract_dir != '\0') {
+		if (mknod(path, i->mode, devtype) < 0)
+			err(FSCK_EX_ERROR, _("mknod failed: %s"), path);
+		change_file_status(path, i);
+	}
+}
+
+static void expand_fs(char *path, struct cramfs_inode *inode)
+{
+	if (S_ISDIR(inode->mode))
+		do_directory(path, inode);
+	else if (S_ISREG(inode->mode))
+		do_file(path, inode);
+	else if (S_ISLNK(inode->mode))
+		do_symlink(path, inode);
+	else
+		do_special_inode(path, inode);
+}
+
+static void test_fs(int start)
+{
+	struct cramfs_inode *root;
+
+	root = read_super();
+	umask(0);
+	euid = geteuid();
+	stream.next_in = NULL;
+	stream.avail_in = 0;
+	inflateInit(&stream);
+	expand_fs(extract_dir, root);
+	inflateEnd(&stream);
+	if (start_data != ~0UL) {
+		if (start_data < (sizeof(struct cramfs_super) + start))
+			errx(FSCK_EX_UNCORRECTED,
+			     _("directory data start (%lu) < sizeof(struct cramfs_super) + start (%zu)"),
+			     start_data, sizeof(struct cramfs_super) + start);
+		if (end_dir != start_data)
+			errx(FSCK_EX_UNCORRECTED,
+			     _("directory data end (%lu) != file data start (%lu)"),
+			     end_dir, start_data);
+	}
+	if (super.flags & CRAMFS_FLAG_FSID_VERSION_2 && end_data > super.size)
+		errx(FSCK_EX_UNCORRECTED, _("invalid file data offset"));
+
+	iput(root);		/* free(root) */
+}
+
+int main(int argc, char **argv)
+{
+	int c;			/* for getopt */
+	int start = 0;
+	size_t length = 0;
+
+	static const struct option longopts[] = {
+		{"verbose",   no_argument,       NULL, 'v'},
+		{"version",   no_argument,       NULL, 'V'},
+		{"help",      no_argument,       NULL, 'h'},
+		{"blocksize", required_argument, NULL, 'b'},
+		{"extract",   optional_argument, NULL, 'x'},
+		{NULL, 0, NULL, 0},
+	};
+
+	setlocale(LC_MESSAGES, "");
+	setlocale(LC_CTYPE, "");
+	bindtextdomain(PACKAGE, LOCALEDIR);
+	textdomain(PACKAGE);
+	close_stdout_atexit();
+
+	strutils_set_exitcode(FSCK_EX_USAGE);
+
+	/* command line options */
+	while ((c = getopt_long(argc, argv, "ayvVhb:", longopts, NULL)) != EOF)
+		switch (c) {
+		case 'a':		/* ignore */
+		case 'y':
+			break;
+		case 'h':
+			usage();
+			break;
+		case 'V':
+			print_version(FSCK_EX_OK);
+		case 'x':
+			opt_extract = 1;
+			if(optarg)
+				extract_dir = optarg;
+			break;
+		case 'v':
+			opt_verbose++;
+			break;
+		case 'b':
+			blksize = strtou32_or_err(optarg, _("invalid blocksize argument"));
+			break;
+		default:
+			errtryhelp(FSCK_EX_USAGE);
+		}
+
+	if ((argc - optind) != 1){
+		warnx(_("bad usage"));
+		errtryhelp(FSCK_EX_USAGE);
+	}
+	filename = argv[optind];
+
+	test_super(&start, &length);
+	test_crc(start);
+
+	if (opt_extract) {
+		size_t bufsize = 0;
+
+		if (blksize == 0)
+			blksize = getpagesize();
+
+		/* re-calculate according to blksize */
+		bufsize = rombufsize = blksize * 2;
+		rombufbits = 0;
+		while (bufsize >>= 1)
+			rombufbits++;
+		rombufmask = rombufsize - 1;
+
+		outbuffer = xmalloc(blksize * 2);
+		read_buffer = xmalloc(rombufsize * 2);
+		test_fs(start);
+	}
+
+	if (opt_verbose)
+		printf(_("%s: OK\n"), filename);
+
+	exit(FSCK_EX_OK);
+}