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-rw-r--r--disk-utils/fsck.cramfs.c625
1 files changed, 625 insertions, 0 deletions
diff --git a/disk-utils/fsck.cramfs.c b/disk-utils/fsck.cramfs.c
new file mode 100644
index 000000000..3485bdc7c
--- /dev/null
+++ b/disk-utils/fsck.cramfs.c
@@ -0,0 +1,625 @@
+/*
+ * 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 <stdio.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <getopt.h>
+#include <utime.h>
+#include <fcntl.h>
+#include <zlib.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+#include <sys/sysmacros.h> /* for major, minor */
+
+#include "cramfs.h"
+#include "../defines.h" /* for HAVE_lchown */
+#include "nls.h"
+
+#define BLKGETSIZE _IO(0x12,96) /* return device size */
+
+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
+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);
+}
+
+/*
+ * 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));
+}
+
+#if 0
+static void iput(struct cramfs_inode *inode)
+{
+ free(inode);
+}
+#endif
+
+/*
+ * 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;
+}
+
+#ifdef HAVE_lchown
+#define my_lchown lchown
+#else
+#define my_lchown chown
+#endif
+
+static void change_file_status(char *path, struct cramfs_inode *i)
+{
+ struct utimbuf epoch = { 0, 0 };
+
+ if (euid == 0) {
+ if (my_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);
+}
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