1 files changed, 385 insertions, 0 deletions
diff --git a/debugfs/dump.c b/debugfs/dump.c
new file mode 100644
index 0000000..42f5204
--- /dev/null
+++ b/debugfs/dump.c
@@ -0,0 +1,385 @@
+/*
+ * dump.c --- dump the contents of an inode out to a file
+ *
+ * Copyright (C) 1994 Theodore Ts'o.  This file may be redistributed
+ * under the terms of the GNU Public License.
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE /* for O_LARGEFILE */
+#endif
+
+#include "config.h"
+#include <stdio.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <string.h>
+#include <time.h>
+#ifdef HAVE_ERRNO_H
+#include <errno.h>
+#endif
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <utime.h>
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#else
+extern int optind;
+extern char *optarg;
+#endif
+
+#include "debugfs.h"
+
+#ifndef O_LARGEFILE
+#define O_LARGEFILE 0
+#endif
+
+/*
+ * The mode_xlate function translates a linux mode into a native-OS mode_t.
+ */
+static struct {
+	__u16 lmask;
+	mode_t mask;
+} mode_table[] = {
+	{ LINUX_S_IRUSR, S_IRUSR },
+	{ LINUX_S_IWUSR, S_IWUSR },
+	{ LINUX_S_IXUSR, S_IXUSR },
+	{ LINUX_S_IRGRP, S_IRGRP },
+	{ LINUX_S_IWGRP, S_IWGRP },
+	{ LINUX_S_IXGRP, S_IXGRP },
+	{ LINUX_S_IROTH, S_IROTH },
+	{ LINUX_S_IWOTH, S_IWOTH },
+	{ LINUX_S_IXOTH, S_IXOTH },
+	{ 0, 0 }
+};
+
+static mode_t mode_xlate(__u16 lmode)
+{
+	mode_t	mode = 0;
+	int	i;
+
+	for (i=0; mode_table[i].lmask; i++) {
+		if (lmode & mode_table[i].lmask)
+			mode |= mode_table[i].mask;
+	}
+	return mode;
+}
+
+static void fix_perms(const char *cmd, const struct ext2_inode *inode,
+		      int fd, const char *name)
+{
+	struct utimbuf ut;
+	int i;
+
+	if (fd != -1)
+		i = fchmod(fd, mode_xlate(inode->i_mode));
+	else
+		i = chmod(name, mode_xlate(inode->i_mode));
+	if (i == -1)
+		com_err(cmd, errno, "while setting permissions of %s", name);
+
+#ifndef HAVE_FCHOWN
+	i = chown(name, inode_uid(*inode), inode_gid(*inode));
+#else
+	if (fd != -1)
+		i = fchown(fd, inode_uid(*inode), inode_gid(*inode));
+	else
+		i = chown(name, inode_uid(*inode), inode_gid(*inode));
+#endif
+	if (i == -1)
+		com_err(cmd, errno, "while changing ownership of %s", name);
+
+	ut.actime = inode->i_atime;
+	ut.modtime = inode->i_mtime;
+	if (utime(name, &ut) == -1)
+		com_err(cmd, errno, "while setting times of %s", name);
+}
+
+static void dump_file(const char *cmdname, ext2_ino_t ino, int fd,
+		      int preserve, char *outname)
+{
+	errcode_t retval;
+	struct ext2_inode	inode;
+	char		*buf = 0;
+	ext2_file_t	e2_file;
+	int		nbytes;
+	unsigned int	got, blocksize = current_fs->blocksize;
+
+	if (debugfs_read_inode(ino, &inode, cmdname))
+		return;
+
+	retval = ext2fs_file_open(current_fs, ino, 0, &e2_file);
+	if (retval) {
+		com_err(cmdname, retval, "while opening ext2 file");
+		return;
+	}
+	retval = ext2fs_get_mem(blocksize, &buf);
+	if (retval) {
+		com_err(cmdname, retval, "while allocating memory");
+		return;
+	}
+	while (1) {
+		retval = ext2fs_file_read(e2_file, buf, blocksize, &got);
+		if (retval)
+			com_err(cmdname, retval, "while reading ext2 file");
+		if (got == 0)
+			break;
+		nbytes = write(fd, buf, got);
+		if ((unsigned) nbytes != got)
+			com_err(cmdname, errno, "while writing file");
+	}
+	if (buf)
+		ext2fs_free_mem(&buf);
+	retval = ext2fs_file_close(e2_file);
+	if (retval) {
+		com_err(cmdname, retval, "while closing ext2 file");
+		return;
+	}
+
+	if (preserve)
+		fix_perms("dump_file", &inode, fd, outname);
+
+	return;
+}
+
+void do_dump(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
+	     void *infop EXT2FS_ATTR((unused)))
+{
+	ext2_ino_t	inode;
+	int		fd;
+	int		c;
+	int		preserve = 0;
+	char		*in_fn, *out_fn;
+
+	reset_getopt();
+	while ((c = getopt (argc, argv, "p")) != EOF) {
+		switch (c) {
+		case 'p':
+			preserve++;
+			break;
+		default:
+		print_usage:
+			com_err(argv[0], 0, "Usage: dump_inode [-p] "
+				"<file> <output_file>");
+			return;
+		}
+	}
+	if (optind != argc-2)
+		goto print_usage;
+
+	if (check_fs_open(argv[0]))
+		return;
+
+	in_fn = argv[optind];
+	out_fn = argv[optind+1];
+
+	inode = string_to_inode(in_fn);
+	if (!inode)
+		return;
+
+	fd = open(out_fn, O_CREAT | O_WRONLY | O_TRUNC | O_LARGEFILE, 0666);
+	if (fd < 0) {
+		com_err(argv[0], errno, "while opening %s for dump_inode",
+			out_fn);
+		return;
+	}
+
+	dump_file(argv[0], inode, fd, preserve, out_fn);
+	if (close(fd) != 0) {
+		com_err(argv[0], errno, "while closing %s for dump_inode",
+			out_fn);
+		return;
+	}
+
+	return;
+}
+
+static void rdump_symlink(ext2_ino_t ino, struct ext2_inode *inode,
+			  const char *fullname)
+{
+	ext2_file_t e2_file;
+	char *buf;
+	errcode_t retval;
+
+	buf = malloc(inode->i_size + 1);
+	if (!buf) {
+		com_err("rdump", errno, "while allocating for symlink");
+		goto errout;
+	}
+
+	if (ext2fs_is_fast_symlink(inode))
+		strcpy(buf, (char *) inode->i_block);
+	else {
+		unsigned bytes = inode->i_size;
+		char *p = buf;
+		retval = ext2fs_file_open(current_fs, ino, 0, &e2_file);
+		if (retval) {
+			com_err("rdump", retval, "while opening symlink");
+			goto errout;
+		}
+		for (;;) {
+			unsigned int got;
+			retval = ext2fs_file_read(e2_file, p, bytes, &got);
+			if (retval) {
+				com_err("rdump", retval, "while reading symlink");
+				goto errout;
+			}
+			bytes -= got;
+			p += got;
+			if (got == 0 || bytes == 0)
+				break;
+		}
+		buf[inode->i_size] = 0;
+		retval = ext2fs_file_close(e2_file);
+		if (retval)
+			com_err("rdump", retval, "while closing symlink");
+	}
+
+	if (symlink(buf, fullname) == -1) {
+		com_err("rdump", errno, "while creating symlink %s -> %s", buf, fullname);
+		goto errout;
+	}
+
+errout:
+	free(buf);
+}
+
+static int rdump_dirent(struct ext2_dir_entry *, int, int, char *, void *);
+
+static void rdump_inode(ext2_ino_t ino, struct ext2_inode *inode,
+			const char *name, const char *dumproot)
+{
+	char *fullname;
+
+	/* There are more efficient ways to do this, but this method
+	 * requires only minimal debugging. */
+	fullname = malloc(strlen(dumproot) + strlen(name) + 2);
+	if (!fullname) {
+		com_err("rdump", errno, "while allocating memory");
+		return;
+	}
+	sprintf(fullname, "%s/%s", dumproot, name);
+
+	if (LINUX_S_ISLNK(inode->i_mode))
+		rdump_symlink(ino, inode, fullname);
+	else if (LINUX_S_ISREG(inode->i_mode)) {
+		int fd;
+		fd = open(fullname, O_WRONLY | O_CREAT | O_TRUNC | O_LARGEFILE, S_IRWXU);
+		if (fd == -1) {
+			com_err("rdump", errno, "while opening %s", fullname);
+			goto errout;
+		}
+		dump_file("rdump", ino, fd, 1, fullname);
+		if (close(fd) != 0) {
+			com_err("rdump", errno, "while closing %s", fullname);
+			goto errout;
+		}
+	}
+	else if (LINUX_S_ISDIR(inode->i_mode) && strcmp(name, ".") && strcmp(name, "..")) {
+		errcode_t retval;
+
+		/* Create the directory with 0700 permissions, because we
+		 * expect to have to create entries it.  Then fix its perms
+		 * once we've done the traversal. */
+		if (name[0] && mkdir(fullname, S_IRWXU) == -1) {
+			com_err("rdump", errno, "while making directory %s", fullname);
+			goto errout;
+		}
+
+		retval = ext2fs_dir_iterate(current_fs, ino, 0, 0,
+					    rdump_dirent, (void *) fullname);
+		if (retval)
+			com_err("rdump", retval, "while dumping %s", fullname);
+
+		fix_perms("rdump", inode, -1, fullname);
+	}
+	/* else do nothing (don't dump device files, sockets, fifos, etc.) */
+
+errout:
+	free(fullname);
+}
+
+static int rdump_dirent(struct ext2_dir_entry *dirent,
+			int offset EXT2FS_ATTR((unused)),
+			int blocksize EXT2FS_ATTR((unused)),
+			char *buf EXT2FS_ATTR((unused)), void *private)
+{
+	char name[EXT2_NAME_LEN + 1];
+	int thislen;
+	const char *dumproot = private;
+	struct ext2_inode inode;
+
+	thislen = ext2fs_dirent_name_len(dirent);
+	strncpy(name, dirent->name, thislen);
+	name[thislen] = 0;
+
+	if (debugfs_read_inode(dirent->inode, &inode, name))
+		return 0;
+
+	rdump_inode(dirent->inode, &inode, name, dumproot);
+
+	return 0;
+}
+
+void do_rdump(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
+	      void *infop EXT2FS_ATTR((unused)))
+{
+	struct stat st;
+	char *dest_dir;
+	int i;
+
+	if (common_args_process(argc, argv, 3, INT_MAX, "rdump",
+				"<directory>... <native directory>", 0))
+		return;
+
+	/* Pull out last argument */
+	dest_dir = argv[argc - 1];
+	argc--;
+
+	/* Ensure last arg is a directory. */
+	if (stat(dest_dir, &st) == -1) {
+		com_err("rdump", errno, "while statting %s", dest_dir);
+		return;
+	}
+	if (!S_ISDIR(st.st_mode)) {
+		com_err("rdump", 0, "%s is not a directory", dest_dir);
+		return;
+	}
+
+	for (i = 1; i < argc; i++) {
+		char *arg = argv[i], *basename;
+		struct ext2_inode inode;
+		ext2_ino_t ino = string_to_inode(arg);
+		if (!ino)
+			continue;
+
+		if (debugfs_read_inode(ino, &inode, arg))
+			continue;
+
+		basename = strrchr(arg, '/');
+		if (basename)
+			basename++;
+		else
+			basename = arg;
+
+		rdump_inode(ino, &inode, basename, dest_dir);
+	}
+}
+
+void do_cat(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
+	    void *infop EXT2FS_ATTR((unused)))
+{
+	ext2_ino_t	inode;
+
+	if (common_inode_args_process(argc, argv, &inode, 0))
+		return;
+
+	fflush(stdout);
+	fflush(stderr);
+	dump_file(argv[0], inode, 1, 0, argv[2]);
+
+	return;
+}
+