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386 lines
8.5 KiB
386 lines
8.5 KiB
/*
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* dump.c --- dump the contents of an inode out to a file
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*
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* Copyright (C) 1994 Theodore Ts'o. This file may be redistributed
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* under the terms of the GNU Public License.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE /* for O_LARGEFILE */
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#endif
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#include "config.h"
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <string.h>
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#include <time.h>
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#ifdef HAVE_ERRNO_H
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#include <errno.h>
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#endif
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <utime.h>
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#ifdef HAVE_GETOPT_H
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#include <getopt.h>
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#else
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extern int optind;
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extern char *optarg;
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#endif
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#include "debugfs.h"
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#ifndef O_LARGEFILE
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#define O_LARGEFILE 0
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#endif
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/*
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* The mode_xlate function translates a linux mode into a native-OS mode_t.
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*/
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static struct {
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__u16 lmask;
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mode_t mask;
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} mode_table[] = {
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{ LINUX_S_IRUSR, S_IRUSR },
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{ LINUX_S_IWUSR, S_IWUSR },
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{ LINUX_S_IXUSR, S_IXUSR },
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{ LINUX_S_IRGRP, S_IRGRP },
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{ LINUX_S_IWGRP, S_IWGRP },
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{ LINUX_S_IXGRP, S_IXGRP },
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{ LINUX_S_IROTH, S_IROTH },
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{ LINUX_S_IWOTH, S_IWOTH },
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{ LINUX_S_IXOTH, S_IXOTH },
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{ 0, 0 }
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};
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static mode_t mode_xlate(__u16 lmode)
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{
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mode_t mode = 0;
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int i;
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for (i=0; mode_table[i].lmask; i++) {
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if (lmode & mode_table[i].lmask)
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mode |= mode_table[i].mask;
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}
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return mode;
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}
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static void fix_perms(const char *cmd, const struct ext2_inode *inode,
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int fd, const char *name)
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{
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struct utimbuf ut;
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int i;
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if (fd != -1)
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i = fchmod(fd, mode_xlate(inode->i_mode));
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else
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i = chmod(name, mode_xlate(inode->i_mode));
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if (i == -1)
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com_err(cmd, errno, "while setting permissions of %s", name);
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#ifndef HAVE_FCHOWN
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i = chown(name, inode->i_uid, inode->i_gid);
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#else
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if (fd != -1)
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i = fchown(fd, inode->i_uid, inode->i_gid);
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else
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i = chown(name, inode->i_uid, inode->i_gid);
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#endif
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if (i == -1)
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com_err(cmd, errno, "while changing ownership of %s", name);
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ut.actime = inode->i_atime;
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ut.modtime = inode->i_mtime;
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if (utime(name, &ut) == -1)
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com_err(cmd, errno, "while setting times of %s", name);
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}
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static void dump_file(const char *cmdname, ext2_ino_t ino, int fd,
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int preserve, char *outname)
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{
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errcode_t retval;
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struct ext2_inode inode;
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char *buf = 0;
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ext2_file_t e2_file;
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int nbytes;
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unsigned int got, blocksize = current_fs->blocksize;
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if (debugfs_read_inode(ino, &inode, cmdname))
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return;
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retval = ext2fs_file_open(current_fs, ino, 0, &e2_file);
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if (retval) {
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com_err(cmdname, retval, "while opening ext2 file");
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return;
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}
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retval = ext2fs_get_mem(blocksize, &buf);
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if (retval) {
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com_err(cmdname, retval, "while allocating memory");
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return;
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}
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while (1) {
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retval = ext2fs_file_read(e2_file, buf, blocksize, &got);
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if (retval)
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com_err(cmdname, retval, "while reading ext2 file");
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if (got == 0)
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break;
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nbytes = write(fd, buf, got);
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if ((unsigned) nbytes != got)
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com_err(cmdname, errno, "while writing file");
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}
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if (buf)
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ext2fs_free_mem(&buf);
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retval = ext2fs_file_close(e2_file);
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if (retval) {
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com_err(cmdname, retval, "while closing ext2 file");
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return;
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}
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if (preserve)
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fix_perms("dump_file", &inode, fd, outname);
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return;
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}
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void do_dump(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
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void *infop EXT2FS_ATTR((unused)))
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{
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ext2_ino_t inode;
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int fd;
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int c;
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int preserve = 0;
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char *in_fn, *out_fn;
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reset_getopt();
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while ((c = getopt (argc, argv, "p")) != EOF) {
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switch (c) {
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case 'p':
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preserve++;
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break;
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default:
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print_usage:
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com_err(argv[0], 0, "Usage: dump_inode [-p] "
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"<file> <output_file>");
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return;
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}
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}
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if (optind != argc-2)
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goto print_usage;
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if (check_fs_open(argv[0]))
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return;
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in_fn = argv[optind];
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out_fn = argv[optind+1];
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inode = string_to_inode(in_fn);
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if (!inode)
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return;
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fd = open(out_fn, O_CREAT | O_WRONLY | O_TRUNC | O_LARGEFILE, 0666);
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if (fd < 0) {
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com_err(argv[0], errno, "while opening %s for dump_inode",
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out_fn);
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return;
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}
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dump_file(argv[0], inode, fd, preserve, out_fn);
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if (close(fd) != 0) {
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com_err(argv[0], errno, "while closing %s for dump_inode",
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out_fn);
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return;
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}
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return;
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}
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static void rdump_symlink(ext2_ino_t ino, struct ext2_inode *inode,
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const char *fullname)
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{
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ext2_file_t e2_file;
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char *buf;
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errcode_t retval;
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buf = malloc(inode->i_size + 1);
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if (!buf) {
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com_err("rdump", errno, "while allocating for symlink");
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goto errout;
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}
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if (ext2fs_is_fast_symlink(inode))
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strcpy(buf, (char *) inode->i_block);
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else {
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unsigned bytes = inode->i_size;
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char *p = buf;
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retval = ext2fs_file_open(current_fs, ino, 0, &e2_file);
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if (retval) {
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com_err("rdump", retval, "while opening symlink");
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goto errout;
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}
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for (;;) {
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unsigned int got;
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retval = ext2fs_file_read(e2_file, p, bytes, &got);
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if (retval) {
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com_err("rdump", retval, "while reading symlink");
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goto errout;
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}
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bytes -= got;
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p += got;
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if (got == 0 || bytes == 0)
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break;
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}
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buf[inode->i_size] = 0;
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retval = ext2fs_file_close(e2_file);
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if (retval)
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com_err("rdump", retval, "while closing symlink");
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}
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if (symlink(buf, fullname) == -1) {
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com_err("rdump", errno, "while creating symlink %s -> %s", buf, fullname);
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goto errout;
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}
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errout:
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free(buf);
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}
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static int rdump_dirent(struct ext2_dir_entry *, int, int, char *, void *);
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static void rdump_inode(ext2_ino_t ino, struct ext2_inode *inode,
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const char *name, const char *dumproot)
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{
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char *fullname;
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/* There are more efficient ways to do this, but this method
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* requires only minimal debugging. */
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fullname = malloc(strlen(dumproot) + strlen(name) + 2);
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if (!fullname) {
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com_err("rdump", errno, "while allocating memory");
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return;
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}
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sprintf(fullname, "%s/%s", dumproot, name);
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if (LINUX_S_ISLNK(inode->i_mode))
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rdump_symlink(ino, inode, fullname);
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else if (LINUX_S_ISREG(inode->i_mode)) {
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int fd;
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fd = open(fullname, O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE, S_IRWXU);
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if (fd == -1) {
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com_err("rdump", errno, "while opening %s", fullname);
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goto errout;
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}
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dump_file("rdump", ino, fd, 1, fullname);
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if (close(fd) != 0) {
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com_err("rdump", errno, "while closing %s", fullname);
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goto errout;
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}
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}
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else if (LINUX_S_ISDIR(inode->i_mode) && strcmp(name, ".") && strcmp(name, "..")) {
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errcode_t retval;
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/* Create the directory with 0700 permissions, because we
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* expect to have to create entries it. Then fix its perms
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* once we've done the traversal. */
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if (name[0] && mkdir(fullname, S_IRWXU) == -1) {
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com_err("rdump", errno, "while making directory %s", fullname);
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goto errout;
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}
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retval = ext2fs_dir_iterate(current_fs, ino, 0, 0,
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rdump_dirent, (void *) fullname);
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if (retval)
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com_err("rdump", retval, "while dumping %s", fullname);
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fix_perms("rdump", inode, -1, fullname);
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}
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/* else do nothing (don't dump device files, sockets, fifos, etc.) */
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errout:
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free(fullname);
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}
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static int rdump_dirent(struct ext2_dir_entry *dirent,
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int offset EXT2FS_ATTR((unused)),
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int blocksize EXT2FS_ATTR((unused)),
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char *buf EXT2FS_ATTR((unused)), void *private)
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{
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char name[EXT2_NAME_LEN + 1];
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int thislen;
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const char *dumproot = private;
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struct ext2_inode inode;
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thislen = ext2fs_dirent_name_len(dirent);
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strncpy(name, dirent->name, thislen);
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name[thislen] = 0;
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if (debugfs_read_inode(dirent->inode, &inode, name))
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return 0;
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rdump_inode(dirent->inode, &inode, name, dumproot);
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return 0;
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}
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void do_rdump(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
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void *infop EXT2FS_ATTR((unused)))
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{
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struct stat st;
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char *dest_dir;
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int i;
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if (common_args_process(argc, argv, 3, INT_MAX, "rdump",
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"<directory>... <native directory>", 0))
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return;
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/* Pull out last argument */
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dest_dir = argv[argc - 1];
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argc--;
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/* Ensure last arg is a directory. */
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if (stat(dest_dir, &st) == -1) {
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com_err("rdump", errno, "while statting %s", dest_dir);
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return;
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}
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if (!S_ISDIR(st.st_mode)) {
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com_err("rdump", 0, "%s is not a directory", dest_dir);
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return;
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}
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for (i = 1; i < argc; i++) {
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char *arg = argv[i], *basename;
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struct ext2_inode inode;
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ext2_ino_t ino = string_to_inode(arg);
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if (!ino)
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continue;
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if (debugfs_read_inode(ino, &inode, arg))
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continue;
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basename = strrchr(arg, '/');
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if (basename)
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basename++;
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else
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basename = arg;
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rdump_inode(ino, &inode, basename, dest_dir);
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}
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}
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void do_cat(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
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void *infop EXT2FS_ATTR((unused)))
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{
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ext2_ino_t inode;
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if (common_inode_args_process(argc, argv, &inode, 0))
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return;
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fflush(stdout);
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fflush(stderr);
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dump_file(argv[0], inode, 1, 0, argv[2]);
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return;
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}
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