patch-2.4.7 linux/scripts/cramfs/cramfsck.c

• Lines: 589
• Date: Thu Jul 19 16:14:53 2001
• Orig file: v2.4.6/linux/scripts/cramfs/cramfsck.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.6/linux/scripts/cramfs/cramfsck.c linux/scripts/cramfs/cramfsck.c
@@ -0,0 +1,588 @@
+/*
+ * cramfsck - check a cramfs file system
+ *
+ * Copyright (C) 2000-2001 Transmeta Corporation
+ *
+ * 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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)
+ */
+
+/* compile-time options */
+#define INCLUDE_FS_TESTS	/* include cramfs checking and extraction */
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/fcntl.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <assert.h>
+#include <getopt.h>
+#include <sys/sysmacros.h>
+#include <utime.h>
+#include <sys/ioctl.h>
+#define _LINUX_STRING_H_
+#include <linux/fs.h>
+#include <linux/cramfs_fs.h>
+#include <zlib.h>
+
+static const char *progname = "cramfsck";
+
+static int fd;			/* ROM image file descriptor */
+static char *filename;		/* ROM image filename */
+struct cramfs_super *super;	/* just find the cramfs superblock once */
+static int opt_verbose = 0;	/* 1 = verbose (-v), 2+ = very verbose (-vv) */
+#ifdef INCLUDE_FS_TESTS
+static int opt_extract = 0;	/* extract cramfs (-x) */
+char *extract_dir = NULL;	/* extraction directory (-x) */
+
+unsigned long start_inode = 1 << 28;	/* start of first non-root inode */
+unsigned long end_inode = 0;		/* end of the directory structure */
+unsigned long start_data = 1 << 28;	/* start of the data (256 MB = max) */
+unsigned long end_data = 0;		/* end of the data */
+/* true?  cramfs_super < start_inode < end_inode <= start_data <= end_data */
+static uid_t euid;			/* effective UID */
+
+#define PAD_SIZE 512
+#define PAGE_CACHE_SIZE (4096)
+
+/* Guarantee access to at least 8kB at a time */
+#define ROMBUFFER_BITS	13
+#define ROMBUFFERSIZE	(1 << ROMBUFFER_BITS)
+#define ROMBUFFERMASK	(ROMBUFFERSIZE-1)
+static char read_buffer[ROMBUFFERSIZE * 2];
+static unsigned long read_buffer_block = ~0UL;
+
+/* Uncompressing data structures... */
+static char outbuffer[PAGE_CACHE_SIZE*2];
+z_stream stream;
+
+#endif /* INCLUDE_FS_TESTS */
+
+/* Input status of 0 to print help and exit without an error. */
+static void usage(int status)
+{
+	FILE *stream = status ? stderr : stdout;
+
+	fprintf(stream, "usage: %s [-hv] [-x dir] file\n"
+		" -h         print this help\n"
+		" -x dir     extract into dir\n"
+		" -v         be more verbose\n"
+		" file       file to test\n", progname);
+
+	exit(status);
+}
+
+#ifdef INCLUDE_FS_TESTS
+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);
+}
+
+/*
+ * Create a fake "blocked" access
+ */
+static void *romfs_read(unsigned long offset)
+{
+	unsigned int block = offset >> ROMBUFFER_BITS;
+	if (block != read_buffer_block) {
+		read_buffer_block = block;
+		lseek(fd, block << ROMBUFFER_BITS, SEEK_SET);
+		read(fd, read_buffer, ROMBUFFERSIZE * 2);
+	}
+	return read_buffer + (offset & ROMBUFFERMASK);
+}
+
+static struct cramfs_inode *cramfs_iget(struct cramfs_inode * i)
+{
+	struct cramfs_inode *inode = malloc(sizeof(struct cramfs_inode));
+	*inode = *i;
+	return inode;
+}
+
+static struct cramfs_inode *iget(unsigned int ino)
+{
+	return cramfs_iget(romfs_read(ino));
+}
+
+void iput(struct cramfs_inode *inode)
+{
+	free(inode);
+}
+
+/*
+ * Return the offset of the root directory,
+ * or 0 if none.
+ */
+static struct cramfs_inode *read_super(void)
+{
+	unsigned long offset;
+
+	offset = super->root.offset << 2;
+	if (super->magic != CRAMFS_MAGIC)
+		return NULL;
+	if (memcmp(super->signature, CRAMFS_SIGNATURE, sizeof(super->signature)) != 0)
+		return NULL;
+	if (offset < sizeof(super))
+		return NULL;
+	return cramfs_iget(&super->root);
+}
+
+static int uncompress_block(void *src, int len)
+{
+	int err;
+
+	stream.next_in = src;
+	stream.avail_in = len;
+
+	stream.next_out = (unsigned char *) outbuffer;
+	stream.avail_out = PAGE_CACHE_SIZE*2;
+
+	inflateReset(&stream);
+
+	err = inflate(&stream, Z_FINISH);
+	if (err != Z_STREAM_END) {
+		fprintf(stderr, "%s: error %d while decompressing! %p(%d)\n",
+			filename, err, src, len);
+		exit(4);
+	}
+	return stream.total_out;
+}
+
+static void change_file_status(char *path, struct cramfs_inode *i)
+{
+	struct utimbuf epoch = { 0, 0 };
+
+	if (euid == 0) {
+		if (lchown(path, i->uid, i->gid) < 0) {
+			perror(path);
+			exit(8);
+		}
+		if (S_ISLNK(i->mode))
+			return;
+		if ((S_ISUID | S_ISGID) & i->mode) {
+			if (chmod(path, i->mode) < 0) {
+				perror(path);
+				exit(8);
+			}
+		}
+	}
+	if (S_ISLNK(i->mode))
+		return;
+	if (utime(path, &epoch) < 0) {
+		perror(path);
+		exit(8);
+	}
+}
+
+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 *) romfs_read(offset);
+	unsigned long size;
+
+	if (next > end_data) {
+		end_data = next;
+	}
+
+	size = uncompress_block(romfs_read(curr), next - curr);
+	if (size != i->size) {
+		fprintf(stderr, "%s: size error in symlink `%s'\n",
+			filename, path);
+		exit(4);
+	}
+	outbuffer[size] = 0;
+	if (opt_verbose) {
+		char *str;
+
+		str = malloc(strlen(outbuffer) + strlen(path) + 5);
+		strcpy(str, path);
+		strncat(str, " -> ", 4);
+		strncat(str, outbuffer, size);
+
+		print_node('l', i, str);
+		if (opt_verbose > 1) {
+			printf("  uncompressing block at %ld to %ld (%ld)\n", curr, next, next - curr);
+		}
+	}
+	if (opt_extract) {
+		symlink(outbuffer, path);
+		change_file_status(path, i);
+	}
+}
+
+static void do_special_inode(char *path, struct cramfs_inode *i)
+{
+	dev_t devtype = 0;
+	char type;
+
+	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))
+		type = 'p';
+	else if (S_ISSOCK(i->mode))
+		type = 's';
+	else {
+		fprintf(stderr, "%s: bogus mode on `%s' (%o)\n", filename, path, i->mode);
+		exit(4);
+	}
+
+	if (opt_verbose) {
+		print_node(type, i, path);
+	}
+
+	if (opt_extract) {
+		if (mknod(path, i->mode, devtype) < 0) {
+			perror(path);
+			exit(8);
+		}
+		change_file_status(path, i);
+	}
+}
+
+static void do_uncompress(int fd, unsigned long offset, unsigned long size)
+{
+	unsigned long curr = offset + 4 * ((size + PAGE_CACHE_SIZE - 1) / PAGE_CACHE_SIZE);
+
+	do {
+		unsigned long out = PAGE_CACHE_SIZE;
+		unsigned long next = *(u32 *) romfs_read(offset);
+
+		if (next > end_data) {
+			end_data = next;
+		}
+
+		offset += 4;
+		if (curr == next) {
+			if (opt_verbose > 1) {
+				printf("  hole at %ld (%d)\n", curr, PAGE_CACHE_SIZE);
+			}
+			if (size < PAGE_CACHE_SIZE)
+				out = size;
+			memset(outbuffer, 0x00, out);
+		}
+		else {
+			if (opt_verbose > 1) {
+				printf("  uncompressing block at %ld to %ld (%ld)\n", curr, next, next - curr);
+			}
+			out = uncompress_block(romfs_read(curr), next - curr);
+		}
+		if (size >= PAGE_CACHE_SIZE) {
+			if (out != PAGE_CACHE_SIZE) {
+				fprintf(stderr, "%s: Non-block (%ld) bytes\n", filename, out);
+				exit(4);
+			}
+		} else {
+			if (out != size) {
+				fprintf(stderr, "%s: Non-size (%ld vs %ld) bytes\n", filename, out, size);
+				exit(4);
+			}
+		}
+		size -= out;
+		if (opt_extract) {
+			write(fd, outbuffer, out);
+		}
+		curr = next;
+	} while (size);
+}
+
+static void expand_fs(int pathlen, char *path, struct cramfs_inode *inode)
+{
+	if (S_ISDIR(inode->mode)) {
+		int count = inode->size;
+		unsigned long offset = inode->offset << 2;
+		char *newpath = malloc(pathlen + 256);
+
+		if (count > 0 && offset < start_inode) {
+			start_inode = offset;
+		}
+		/* XXX - need to check end_inode for empty case? */
+		memcpy(newpath, path, pathlen);
+		newpath[pathlen] = '/';
+		pathlen++;
+		if (opt_verbose) {
+			print_node('d', inode, path);
+		}
+		if (opt_extract) {
+			mkdir(path, inode->mode);
+			change_file_status(path, inode);
+		}
+		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 ((pathlen + newlen) - strlen(newpath) > 3) {
+				fprintf(stderr, "%s: invalid cramfs--bad path length\n", filename);
+				exit(4);
+			}
+			expand_fs(strlen(newpath), newpath, child);
+
+			offset += newlen;
+
+			if (offset > end_inode) {
+				end_inode = offset;
+			}
+		}
+		return;
+	}
+	if (S_ISREG(inode->mode)) {
+		int fd = 0;
+		unsigned long offset = inode->offset << 2;
+
+		if (offset > 0 && offset < start_data) {
+			start_data = offset;
+		}
+		if (opt_verbose) {
+			print_node('f', inode, path);
+		}
+		if (opt_extract) {
+			fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, inode->mode);
+		}
+		if (inode->size) {
+			do_uncompress(fd, offset, inode->size);
+		}
+		if (opt_extract) {
+			close(fd);
+			change_file_status(path, inode);
+		}
+		return;
+	}
+	if (S_ISLNK(inode->mode)) {
+		unsigned long offset = inode->offset << 2;
+
+		if (offset < start_data) {
+			start_data = offset;
+		}
+		do_symlink(path, inode);
+		return;
+	}
+	else {
+		do_special_inode(path, inode);
+		return;
+	}
+}
+#endif /* INCLUDE_FS_TESTS */
+
+int main(int argc, char **argv)
+{
+	void *buf;
+	size_t length;
+	struct stat st;
+	u32 crc_old, crc_new;
+#ifdef INCLUDE_FS_TESTS
+	struct cramfs_inode *root;
+#endif /* INCLUDE_FS_TESTS */
+	int c;			/* for getopt */
+	int start = 0;
+
+	if (argc)
+		progname = argv[0];
+
+	/* command line options */
+	while ((c = getopt(argc, argv, "hx:v")) != EOF) {
+		switch (c) {
+		case 'h':
+			usage(0);
+		case 'x':
+#ifdef INCLUDE_FS_TESTS
+			opt_extract = 1;
+			extract_dir = malloc(strlen(optarg) + 1);
+			strcpy(extract_dir, optarg);
+			break;
+#else /*  not INCLUDE_FS_TESTS */
+			fprintf(stderr, "%s: compiled without -x support\n",
+				progname);
+			exit(16);
+#endif /* not INCLUDE_FS_TESTS */
+		case 'v':
+			opt_verbose++;
+			break;
+		}
+	}
+
+	if ((argc - optind) != 1)
+		usage(16);
+	filename = argv[optind];
+
+	/* find the physical size of the file or block device */
+	if (lstat(filename, &st) < 0) {
+		perror(filename);
+		exit(8);
+	}
+	fd = open(filename, O_RDONLY);
+	if (fd < 0) {
+		perror(filename);
+		exit(8);
+	}
+	if (S_ISBLK(st.st_mode)) {
+		if (ioctl(fd, BLKGETSIZE, &length) < 0) {
+			fprintf(stderr, "%s: warning--unable to determine filesystem size \n", filename);
+			exit(4);
+		}
+		length = length * 512;
+	}
+	else if (S_ISREG(st.st_mode)) {
+		length = st.st_size;
+	}
+	else {
+		fprintf(stderr, "%s is not a block device or file\n", filename);
+		exit(8);
+	}
+
+	if (length < sizeof(struct cramfs_super)) {
+		fprintf(stderr, "%s: invalid cramfs--file length too short\n", filename);
+		exit(4);
+	}
+
+	if (S_ISBLK(st.st_mode)) {
+		/* nasty because mmap of block devices fails */
+		buf = mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
+		read(fd, buf, length);
+	}
+	else {
+		/* nice and easy */
+		buf = mmap(NULL, length, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
+	}
+
+	/* XXX - this could be cleaner... */
+	if (((struct cramfs_super *) buf)->magic == CRAMFS_MAGIC) {
+		start = 0;
+		super = (struct cramfs_super *) buf;
+	}
+	else if (length >= (PAD_SIZE + sizeof(struct cramfs_super)) &&
+		 ((((struct cramfs_super *) (buf + PAD_SIZE))->magic == CRAMFS_MAGIC)))
+	{
+		start = PAD_SIZE;
+		super = (struct cramfs_super *) (buf + PAD_SIZE);
+	}
+	else {
+		fprintf(stderr, "%s: invalid cramfs--wrong magic\n", filename);
+		exit(4);
+	}
+
+	if (super->flags & CRAMFS_FLAG_FSID_VERSION_2) {
+		/* length test */
+		if (length < super->size) {
+			fprintf(stderr, "%s: invalid cramfs--file length too short\n", filename);
+			exit(4);
+		}
+		else if (length > super->size) {
+			fprintf(stderr, "%s: warning--file length too long, padded image?\n", filename);
+		}
+
+		/* CRC test */
+		crc_old = super->fsid.crc;
+		super->fsid.crc = crc32(0L, Z_NULL, 0);
+		crc_new = crc32(0L, Z_NULL, 0);
+		crc_new = crc32(crc_new, (unsigned char *) buf+start, super->size - start);
+		if (crc_new != crc_old) {
+			fprintf(stderr, "%s: invalid cramfs--crc error\n", filename);
+			exit(4);
+		}
+	}
+	else {
+		fprintf(stderr, "%s: warning--old cramfs image, no CRC\n",
+			filename);
+	}
+
+#ifdef INCLUDE_FS_TESTS
+	super = (struct cramfs_super *) malloc(sizeof(struct cramfs_super));
+	if (((struct cramfs_super *) buf)->magic == CRAMFS_MAGIC) {
+		memcpy(super, buf, sizeof(struct cramfs_super));
+	}
+	else if (length >= (PAD_SIZE + sizeof(struct cramfs_super)) &&
+		 ((((struct cramfs_super *) (buf + PAD_SIZE))->magic == CRAMFS_MAGIC)))
+	{
+		memcpy(super, (buf + PAD_SIZE), sizeof(struct cramfs_super));
+	}
+
+	munmap(buf, length);
+
+	/* file format test, uses fake "blocked" accesses */
+	root = read_super();
+	umask(0);
+	euid = geteuid();
+	if (!root) {
+		fprintf(stderr, "%s: invalid cramfs--bad superblock\n",
+			filename);
+		exit(4);
+	}
+	stream.next_in = NULL;
+	stream.avail_in = 0;
+	inflateInit(&stream);
+
+	if (!extract_dir) {
+		extract_dir = "root";
+	}
+
+	expand_fs(strlen(extract_dir), extract_dir, root);
+	inflateEnd(&stream);
+
+	if (start_data != 1 << 28  && end_inode != start_data) {
+		fprintf(stderr, "%s: invalid cramfs--directory data end (%ld) != file data start (%ld)\n", filename, end_inode, start_data);
+		exit(4);
+	}
+	if (super->flags & CRAMFS_FLAG_FSID_VERSION_2) {
+		if (end_data > super->size) {
+			fprintf(stderr, "%s: invalid cramfs--invalid file data offset\n", filename);
+			exit(4);
+		}
+	}
+#endif /* INCLUDE_FS_TESTS */
+
+	exit(0);
+}