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-rw-r--r--debugfs/xattrs.c503
1 files changed, 503 insertions, 0 deletions
diff --git a/debugfs/xattrs.c b/debugfs/xattrs.c
new file mode 100644
index 0000000..cd042bc
--- /dev/null
+++ b/debugfs/xattrs.c
@@ -0,0 +1,503 @@
+/*
+ * xattrs.c --- Modify extended attributes via debugfs.
+ *
+ * Copyright (C) 2014 Oracle. This file may be redistributed
+ * under the terms of the GNU Public License.
+ */
+
+#include "config.h"
+#include <stdio.h>
+#ifdef HAVE_GETOPT_H
+#include <getopt.h>
+#else
+extern int optind;
+extern char *optarg;
+#endif
+#include <ctype.h>
+#include "support/cstring.h"
+
+#include "debugfs.h"
+
+#define PRINT_XATTR_HEX 0x01
+#define PRINT_XATTR_RAW 0x02
+#define PRINT_XATTR_C 0x04
+#define PRINT_XATTR_STATFMT 0x08
+#define PRINT_XATTR_NOQUOTES 0x10
+
+/* Dump extended attributes */
+static void print_xattr_hex(FILE *f, const char *str, int len)
+{
+ int i;
+
+ for (i = 0; i < len; i++)
+ fprintf(f, "%02x ", (unsigned char)str[i]);
+}
+
+/* Dump extended attributes */
+static void print_xattr_string(FILE *f, const char *str, int len, int flags)
+{
+ int printable = 0;
+ int i;
+
+ if (flags & PRINT_XATTR_RAW) {
+ fwrite(str, len, 1, f);
+ return;
+ }
+
+ if ((flags & PRINT_XATTR_C) == 0) {
+ /* check: is string "printable enough?" */
+ for (i = 0; i < len; i++)
+ if (isprint(str[i]))
+ printable++;
+
+ if (printable <= len*7/8)
+ flags |= PRINT_XATTR_HEX;
+ }
+
+ if (flags & PRINT_XATTR_HEX) {
+ print_xattr_hex(f, str, len);
+ } else {
+ if ((flags & PRINT_XATTR_NOQUOTES) == 0)
+ fputc('\"', f);
+ print_c_string(f, str, len);
+ if ((flags & PRINT_XATTR_NOQUOTES) == 0)
+ fputc('\"', f);
+ }
+}
+
+static void print_xattr(FILE *f, char *name, char *value, size_t value_len,
+ int print_flags)
+{
+ print_xattr_string(f, name, strlen(name), PRINT_XATTR_NOQUOTES);
+ fprintf(f, " (%zu)", value_len);
+ if ((print_flags & PRINT_XATTR_STATFMT) &&
+ (strcmp(name, "system.data") == 0))
+ value_len = 0;
+ if (value_len != 0 &&
+ (!(print_flags & PRINT_XATTR_STATFMT) || (value_len < 40))) {
+ fprintf(f, " = ");
+ print_xattr_string(f, value, value_len, print_flags);
+ }
+ fputc('\n', f);
+}
+
+static int dump_attr(char *name, char *value, size_t value_len, void *data)
+{
+ FILE *out = data;
+
+ fprintf(out, " ");
+ print_xattr(out, name, value, value_len, PRINT_XATTR_STATFMT);
+ return 0;
+}
+
+void dump_inode_attributes(FILE *out, ext2_ino_t ino)
+{
+ struct ext2_xattr_handle *h;
+ size_t sz;
+ errcode_t err;
+
+ err = ext2fs_xattrs_open(current_fs, ino, &h);
+ if (err)
+ return;
+
+ err = ext2fs_xattrs_read(h);
+ if (err)
+ goto out;
+
+ err = ext2fs_xattrs_count(h, &sz);
+ if (err || sz == 0)
+ goto out;
+
+ fprintf(out, "Extended attributes:\n");
+ err = ext2fs_xattrs_iterate(h, dump_attr, out);
+ if (err)
+ goto out;
+
+out:
+ err = ext2fs_xattrs_close(&h);
+}
+
+void do_list_xattr(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
+ void *infop EXT2FS_ATTR((unused)))
+{
+ ext2_ino_t ino;
+
+ if (argc != 2) {
+ printf("%s: Usage: %s <file>\n", argv[0],
+ argv[0]);
+ return;
+ }
+
+ if (check_fs_open(argv[0]))
+ return;
+
+ ino = string_to_inode(argv[1]);
+ if (!ino)
+ return;
+
+ dump_inode_attributes(stdout, ino);
+}
+
+void do_get_xattr(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
+ void *infop EXT2FS_ATTR((unused)))
+{
+ ext2_ino_t ino;
+ struct ext2_xattr_handle *h;
+ FILE *fp = NULL;
+ char *buf = NULL;
+ size_t buflen;
+ int i;
+ int print_flags = 0;
+ unsigned int handle_flags = 0;
+ errcode_t err;
+
+ reset_getopt();
+ while ((i = getopt(argc, argv, "Cf:rxV")) != -1) {
+ switch (i) {
+ case 'f':
+ if (fp)
+ fclose(fp);
+ fp = fopen(optarg, "w");
+ if (fp == NULL) {
+ perror(optarg);
+ return;
+ }
+ break;
+ case 'r':
+ handle_flags |= XATTR_HANDLE_FLAG_RAW;
+ break;
+ case 'x':
+ print_flags |= PRINT_XATTR_HEX;
+ break;
+ case 'V':
+ print_flags |= PRINT_XATTR_RAW|
+ PRINT_XATTR_NOQUOTES;
+ break;
+ case 'C':
+ print_flags |= PRINT_XATTR_C;
+ break;
+ default:
+ goto usage;
+ }
+ }
+
+ if (optind != argc - 2) {
+ usage:
+ printf("%s: Usage: %s [-f outfile]|[-xVC] [-r] <file> <attr>\n",
+ argv[0], argv[0]);
+
+ goto out2;
+ }
+
+ if (check_fs_open(argv[0]))
+ goto out2;
+
+ ino = string_to_inode(argv[optind]);
+ if (!ino)
+ goto out2;
+
+ err = ext2fs_xattrs_open(current_fs, ino, &h);
+ if (err)
+ goto out2;
+
+ err = ext2fs_xattrs_flags(h, &handle_flags, NULL);
+ if (err)
+ goto out;
+
+ err = ext2fs_xattrs_read(h);
+ if (err)
+ goto out;
+
+ err = ext2fs_xattr_get(h, argv[optind + 1], (void **)&buf, &buflen);
+ if (err)
+ goto out;
+
+ if (fp) {
+ fwrite(buf, buflen, 1, fp);
+ } else {
+ if (print_flags & PRINT_XATTR_RAW) {
+ if (print_flags & (PRINT_XATTR_HEX|PRINT_XATTR_C))
+ print_flags &= ~PRINT_XATTR_RAW;
+ print_xattr_string(stdout, buf, buflen, print_flags);
+ } else {
+ print_xattr(stdout, argv[optind + 1],
+ buf, buflen, print_flags);
+ }
+ printf("\n");
+ }
+
+ ext2fs_free_mem(&buf);
+out:
+ ext2fs_xattrs_close(&h);
+ if (err)
+ com_err(argv[0], err, "while getting extended attribute");
+out2:
+ if (fp)
+ fclose(fp);
+}
+
+void do_set_xattr(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
+ void *infop EXT2FS_ATTR((unused)))
+{
+ ext2_ino_t ino;
+ struct ext2_xattr_handle *h;
+ FILE *fp = NULL;
+ char *buf = NULL;
+ size_t buflen;
+ unsigned int handle_flags = 0;
+ int i;
+ errcode_t err;
+
+ reset_getopt();
+ while ((i = getopt(argc, argv, "f:r")) != -1) {
+ switch (i) {
+ case 'f':
+ if (fp)
+ fclose(fp);
+ fp = fopen(optarg, "r");
+ if (fp == NULL) {
+ perror(optarg);
+ return;
+ }
+ break;
+ case 'r':
+ handle_flags |= XATTR_HANDLE_FLAG_RAW;
+ break;
+ default:
+ goto print_usage;
+ }
+ }
+
+ if (!(fp && optind == argc - 2) && !(!fp && optind == argc - 3)) {
+ print_usage:
+ printf("Usage:\t%s [-r] <file> <attr> <value>\n", argv[0]);
+ printf("\t%s -f <value_file> [-r] <file> <attr>\n", argv[0]);
+ goto out2;
+ }
+
+ if (check_fs_open(argv[0]))
+ goto out2;
+ if (check_fs_read_write(argv[0]))
+ goto out2;
+ if (check_fs_bitmaps(argv[0]))
+ goto out2;
+
+ ino = string_to_inode(argv[optind]);
+ if (!ino)
+ goto out2;
+
+ err = ext2fs_xattrs_open(current_fs, ino, &h);
+ if (err)
+ goto out2;
+
+ err = ext2fs_xattrs_flags(h, &handle_flags, NULL);
+ if (err)
+ goto out;
+
+ err = ext2fs_xattrs_read(h);
+ if (err)
+ goto out;
+
+ if (fp) {
+ err = ext2fs_get_mem(current_fs->blocksize, &buf);
+ if (err)
+ goto out;
+ buflen = fread(buf, 1, current_fs->blocksize, fp);
+ } else {
+ buf = argv[optind + 2];
+ buflen = parse_c_string(buf);
+ }
+
+ err = ext2fs_xattr_set(h, argv[optind + 1], buf, buflen);
+out:
+ ext2fs_xattrs_close(&h);
+ if (err)
+ com_err(argv[0], err, "while setting extended attribute");
+out2:
+ if (fp) {
+ fclose(fp);
+ ext2fs_free_mem(&buf);
+ }
+}
+
+void do_rm_xattr(int argc, char **argv, int sci_idx EXT2FS_ATTR((unused)),
+ void *infop EXT2FS_ATTR((unused)))
+{
+ ext2_ino_t ino;
+ struct ext2_xattr_handle *h;
+ int i;
+ errcode_t err;
+
+ if (argc < 3) {
+ printf("%s: Usage: %s <file> <attrs>...\n", argv[0], argv[0]);
+ return;
+ }
+
+ if (check_fs_open(argv[0]))
+ return;
+ if (check_fs_read_write(argv[0]))
+ return;
+ if (check_fs_bitmaps(argv[0]))
+ return;
+
+ ino = string_to_inode(argv[1]);
+ if (!ino)
+ return;
+
+ err = ext2fs_xattrs_open(current_fs, ino, &h);
+ if (err)
+ return;
+
+ err = ext2fs_xattrs_read(h);
+ if (err)
+ goto out;
+
+ for (i = 2; i < argc; i++) {
+ err = ext2fs_xattr_remove(h, argv[i]);
+ if (err)
+ goto out;
+ }
+out:
+ ext2fs_xattrs_close(&h);
+ if (err)
+ com_err(argv[0], err, "while removing extended attribute");
+}
+
+/*
+ * Return non-zero if the string has a minimal number of non-printable
+ * characters.
+ */
+static int is_mostly_printable(const char *cp, int len)
+{
+ int np = 0;
+
+ if (len < 0)
+ len = strlen(cp);
+
+ while (len--) {
+ if (!isprint(*cp++)) {
+ np++;
+ if (np > 3)
+ return 0;
+ }
+ }
+ return 1;
+}
+
+static void safe_print(FILE *f, const char *cp, int len)
+{
+ unsigned char ch;
+
+ if (len < 0)
+ len = strlen(cp);
+
+ while (len--) {
+ ch = *cp++;
+ if (ch > 128) {
+ fputs("M-", f);
+ ch -= 128;
+ }
+ if ((ch < 32) || (ch == 0x7f)) {
+ fputc('^', f);
+ ch ^= 0x40; /* ^@, ^A, ^B; ^? for DEL */
+ }
+ fputc(ch, f);
+ }
+}
+
+static void dump_xattr_raw_entries(FILE *f, unsigned char *buf,
+ unsigned int start, unsigned int len,
+ unsigned value_start)
+{
+ struct ext2_ext_attr_entry ent;
+ unsigned int off = start;
+ unsigned int vstart;
+
+ while (off < len) {
+ if ((*(__u16 *) (buf + off)) == 0) {
+ fprintf(f, "last entry found at offset %u (%04o)\n",
+ off, off);
+ break;
+ }
+ if ((off + sizeof(struct ext2_ext_attr_entry)) >= len) {
+ fprintf(f, "xattr buffer overrun at %u (len = %u)\n",
+ off, len);
+ break;
+ }
+#if WORDS_BIGENDIAN
+ ext2fs_swap_ext_attr_entry(&ent,
+ (struct ext2_ext_attr_entry *) (buf + off));
+#else
+ ent = *((struct ext2_ext_attr_entry *) (buf + off));
+#endif
+ fprintf(f, "offset = %d (%04o), hash = %u, name_len = %u, "
+ "name_index = %u\n",
+ off, off, ent.e_hash, ent.e_name_len, ent.e_name_index);
+ vstart = value_start + ent.e_value_offs;
+ fprintf(f, "value_offset = %d (%04o), value_inum = %u, "
+ "value_size = %u\n", ent.e_value_offs,
+ vstart, ent.e_value_inum, ent.e_value_size);
+ off += sizeof(struct ext2_ext_attr_entry);
+ fprintf(f, "name = ");
+ if ((off + ent.e_name_len) >= len)
+ fprintf(f, "<runs off end>");
+ else
+ safe_print(f, (char *)(buf + off), ent.e_name_len);
+ fputc('\n', f);
+ if (ent.e_value_size == 0)
+ goto skip_value;
+ fprintf(f, "value = ");
+ if (ent.e_value_inum)
+ fprintf(f, "<ino %u>", ent.e_value_inum);
+ else if (ent.e_value_offs >= len ||
+ (vstart + ent.e_value_size) > len)
+ fprintf(f, "<runs off end>");
+ else if (is_mostly_printable((char *)(buf + vstart),
+ ent.e_value_size))
+ safe_print(f, (char *)(buf + vstart),
+ ent.e_value_size);
+ else {
+ fprintf(f, "<hexdump>\n");
+ do_byte_hexdump(f, (unsigned char *)(buf + vstart),
+ ent.e_value_size);
+ }
+ fputc('\n', f);
+ skip_value:
+ fputc('\n', f);
+ off += (ent.e_name_len + 3) & ~3;
+ }
+}
+
+void raw_inode_xattr_dump(FILE *f, unsigned char *buf, unsigned int len)
+{
+ __u32 magic = ext2fs_le32_to_cpu(*((__le32 *) buf));
+
+ fprintf(f, "magic = %08x, length = %u, value_start =4 \n\n",
+ magic, len);
+ if (magic == EXT2_EXT_ATTR_MAGIC)
+ dump_xattr_raw_entries(f, buf, 4, len, 4);
+}
+
+void block_xattr_dump(FILE *f, unsigned char *buf, unsigned int len)
+{
+ struct ext2_ext_attr_header header;
+
+#ifdef WORDS_BIGENDIAN
+ ext2fs_swap_ext_attr_header(&header,
+ (struct ext2_ext_attr_header *) buf);
+#else
+ header = *((struct ext2_ext_attr_header *) buf);
+#endif
+ fprintf(f, "magic = %08x, length = %u\n", header.h_magic, len);
+ if (header.h_magic != EXT2_EXT_ATTR_MAGIC)
+ return;
+ fprintf(f, "refcount = %u, blocks = %u\n", header.h_refcount,
+ header.h_blocks);
+ fprintf(f, "hash = %08x, checksum = %08x\n", header.h_hash,
+ header.h_checksum);
+ fprintf(f, "reserved: %08x %08x %08x\n\n", header.h_reserved[0],
+ header.h_reserved[1], header.h_reserved[2]);
+
+ dump_xattr_raw_entries(f, buf,
+ sizeof(struct ext2_ext_attr_header), len, 0);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-04 13:15:34 +0000