+/*
+ * Copyright (c) 1999-2004
+ * Stelian Pop <stelian@popies.net>, 1999-2004
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static const char rcsid[] =
+ "$Id: xattr.c,v 1.1 2005/05/02 15:10:47 stelian Exp $";
+#endif /* not lint */
+
+#include <config.h>
+#include <compatlfs.h>
+#include <compaterr.h>
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+#include <bsdcompat.h>
+#include <protocols/dumprestore.h>
+#include "restore.h"
+#include "extern.h"
+#include "pathnames.h"
+
+/*
+ * Data structures below taken from the kernel
+ */
+
+/* Maximum number of references to one attribute block */
+#define EXT2_XATTR_REFCOUNT_MAX 1024
+
+/* Name indexes */
+#define EXT2_XATTR_INDEX_MAX 10
+#define EXT2_XATTR_INDEX_USER 1
+#define EXT2_XATTR_INDEX_POSIX_ACL_ACCESS 2
+#define EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT 3
+#define EXT2_XATTR_INDEX_TRUSTED 4
+#define EXT2_XATTR_INDEX_LUSTRE 5
+#define EXT2_XATTR_INDEX_SECURITY 6
+
+struct ext2_xattr_header {
+ u_int32_t h_magic; /* magic number for identification */
+ u_int32_t h_refcount; /* reference count */
+ u_int32_t h_blocks; /* number of disk blocks used */
+ u_int32_t h_hash; /* hash value of all attributes */
+ u_int32_t h_reserved[4]; /* zero right now */
+};
+
+struct ext3_xattr_ibody_header {
+ u_int32_t h_magic; /* magic number for identification */
+};
+
+struct ext2_xattr_entry {
+ u_char e_name_len; /* length of name */
+ u_char e_name_index; /* attribute name index */
+ u_int16_t e_value_offs; /* offset in disk block of value */
+ u_int32_t e_value_block; /* disk block attribute is stored on (n/i) */
+ u_int32_t e_value_size; /* size of attribute value */
+ u_int32_t e_hash; /* hash value of name and value */
+ char e_name[0]; /* attribute name */
+};
+
+#define EXT2_XATTR_PAD_BITS 2
+#define EXT2_XATTR_PAD (1<<EXT2_XATTR_PAD_BITS)
+#define EXT2_XATTR_ROUND (EXT2_XATTR_PAD-1)
+#define EXT2_XATTR_LEN(name_len) \
+ (((name_len) + EXT2_XATTR_ROUND + \
+ sizeof(struct ext2_xattr_entry)) & ~EXT2_XATTR_ROUND)
+#define EXT2_XATTR_NEXT(entry) \
+ ( (struct ext2_xattr_entry *)( \
+ (char *)(entry) + EXT2_XATTR_LEN((entry)->e_name_len)) )
+#define EXT3_XATTR_SIZE(size) \
+ (((size) + EXT2_XATTR_ROUND) & ~EXT2_XATTR_ROUND)
+
+#define HDR(buffer) ((struct ext2_xattr_header *)(buffer))
+#define ENTRY(ptr) ((struct ext2_xattr_entry *)(ptr))
+#define IS_LAST_ENTRY(entry) (*(__u32 *)(entry) == 0)
+
+#define BFIRST(buffer) ENTRY(HDR(buffer)+1)
+#define IFIRST(buffer) ENTRY(((struct ext3_xattr_ibody_header *)(buffer))+1)
+
+#define FIRST_ENTRY(buffer) \
+ ((HDR(buffer)->h_magic == EXT2_XATTR_MAGIC2) ? \
+ IFIRST(buffer) : \
+ BFIRST(buffer))
+
+/*
+ * On-block xattr value offsets start at the beginning of the block, but
+ * on-inode xattr value offsets start after the initial header
+ * (ext3_xattr_ibody_header).
+ */
+#define VALUE_OFFSET(buffer, entry) \
+ (((HDR(buffer)->h_magic == EXT2_XATTR_MAGIC2) ? \
+ (entry)->e_value_offs + sizeof(struct ext3_xattr_ibody_header) : \
+ (entry)->e_value_offs))
+
+/*
+ * xattr syscalls do not exist yet in libc, get our own copy here,
+ * taken from libattr.
+ */
+#if defined (__i386__)
+# define HAVE_XATTR_SYSCALLS 1
+# define __NR_lsetxattr 227
+# define __NR_lgetxattr 230
+# define __NR_llistxattr 233
+#elif defined (__sparc__)
+# define HAVE_XATTR_SYSCALLS 1
+# define __NR_lsetxattr 170
+# define __NR_lgetxattr 173
+# define __NR_llistxattr 179
+#elif defined (__ia64__)
+# define HAVE_XATTR_SYSCALLS 1
+# define __NR_lsetxattr 1218
+# define __NR_lgetxattr 1221
+# define __NR_llistxattr 1224
+#elif defined (__powerpc__)
+# define HAVE_XATTR_SYSCALLS 1
+# define __NR_lsetxattr 210
+# define __NR_lgetxattr 213
+# define __NR_llistxattr 216
+#elif defined (__x86_64__)
+# define HAVE_XATTR_SYSCALLS 1
+# define __NR_lsetxattr 189
+# define __NR_lgetxattr 192
+# define __NR_llistxattr 195
+#elif defined (__s390__)
+# define HAVE_XATTR_SYSCALLS 1
+# define __NR_lsetxattr 225
+# define __NR_lgetxattr 228
+# define __NR_llistxattr 231
+#elif defined (__arm__)
+# define HAVE_XATTR_SYSCALLS 1
+# define __NR_SYSCALL_BASE 0x900000
+# define __NR_lsetxattr (__NR_SYSCALL_BASE+227)
+# define __NR_lgetxattr (__NR_SYSCALL_BASE+230)
+# define __NR_llistxattr (__NR_SYSCALL_BASE+233)
+#elif defined (__mips64__)
+# define HAVE_XATTR_SYSCALLS 1
+# define __NR_Linux 5000
+# define __NR_lsetxattr (__NR_Linux + 218)
+# define __NR_lgetxattr (__NR_Linux + 221)
+# define __NR_llistxattr (__NR_Linux + 224)
+#elif defined (__mips__)
+# define HAVE_XATTR_SYSCALLS 1
+# define __NR_Linux 4000
+# define __NR_lsetxattr (__NR_Linux + 225)
+# define __NR_lgetxattr (__NR_Linux + 228)
+# define __NR_llistxattr (__NR_Linux + 231)
+#elif defined (__alpha__)
+# define HAVE_XATTR_SYSCALLS 1
+# define __NR_lsetxattr 383
+# define __NR_lgetxattr 386
+# define __NR_llistxattr 389
+#elif defined (__mc68000__)
+# define HAVE_XATTR_SYSCALLS 1
+# define __NR_lsetxattr 224
+# define __NR_lgetxattr 227
+# define __NR_llistxattr 230
+#else
+# warning "Extended attribute syscalls undefined for this architecture"
+# define HAVE_XATTR_SYSCALLS 0
+#endif
+
+#if HAVE_XATTR_SYSCALLS
+# define SYSCALL(args...) syscall(args)
+#else
+# define SYSCALL(args...) ( errno = ENOSYS, -1 )
+#endif
+
+static int lsetxattr __P((const char *, const char *, void *, size_t, int));
+static ssize_t lgetxattr __P((const char *, const char *, void *, size_t));
+static ssize_t llistxattr __P((const char *, char *, size_t));
+static int xattr_cb_list __P((char *, char *, int, void *));
+static int xattr_cb_set __P((char *, char *, int, void *));
+static int xattr_cb_compare __P((char *, char *, int, void *));
+static int xattr_verify __P((char *));
+static int xattr_count __P((char *, int *));
+static int xattr_walk __P((char *, int (*)(char *, char *, int, void *), void *));
+
+static int
+lsetxattr(const char *path, const char *name, void *value, size_t size, int flags)
+{
+ return SYSCALL(__NR_lsetxattr, path, name, value, size, flags);
+}
+
+static ssize_t
+lgetxattr(const char *path, const char *name, void *value, size_t size)
+{
+ return SYSCALL(__NR_lgetxattr, path, name, value, size);
+}
+
+static ssize_t
+llistxattr(const char *path, char *list, size_t size)
+{
+ return SYSCALL(__NR_llistxattr, path, list, size);
+}
+
+/*
+ * Dump code starts here :)
+ */
+
+static int
+xattr_cb_list(char *name, char *value, int valuelen, void *private)
+{
+ value[valuelen] = '\0';
+ printf("EA: %s:%s\n", name, value);
+
+ return GOOD;
+}
+
+static int
+xattr_cb_set(char *name, char *value, int valuelen, void *private)
+{
+ char *path = (char *)private;
+
+ if (lsetxattr(path, name, value, valuelen, 0) < 0) {
+ warn("lsetxattr %s failed", path);
+ return FAIL;
+ }
+ return GOOD;
+}
+
+static int
+xattr_cb_compare(char *name, char *value, int valuelen, void *private)
+{
+ char *path = (char *)private;
+ char valuef[XATTR_MAXSIZE];
+ int valuesz;
+
+ valuesz = lgetxattr(path, name, valuef, XATTR_MAXSIZE);
+ if (valuesz < 0) {
+ warn("%s: lgetxattr failed\n", path);
+ return FAIL;
+ }
+
+ if (valuesz != valuelen) {
+ fprintf(stderr, "%s: EA %s value changed\n", path, value);
+ return FAIL;
+ }
+
+ if (memcmp(value, valuef, valuelen)) {
+ fprintf(stderr, "%s: EA %s value changed\n", path, value);
+ return FAIL;
+ }
+
+ return GOOD;
+}
+
+static int
+xattr_verify(char *buffer)
+{
+ struct ext2_xattr_entry *entry;
+ char *end;
+
+ end = buffer + XATTR_MAXSIZE;
+
+ if (Bcvt)
+ swabst("4i", (u_char *)buffer);
+
+ if (HDR(buffer)->h_magic != EXT2_XATTR_MAGIC &&
+ HDR(buffer)->h_magic != EXT2_XATTR_MAGIC2) {
+ fprintf(stderr, "error in EA block 1\n");
+ fprintf(stderr, "magic = %x\n", HDR(buffer)->h_magic);
+
+ return FAIL;
+ }
+
+ /* check the on-disk data structure */
+ entry = FIRST_ENTRY(buffer);
+ if (Bcvt)
+ swabst("2b1s3i", (u_char *)entry);
+ while (!IS_LAST_ENTRY(entry)) {
+ struct ext2_xattr_entry *next = EXT2_XATTR_NEXT(entry);
+
+ if ((char *)next >= end) {
+ fprintf(stderr, "error in EA block\n");
+ return FAIL;
+ }
+ entry = next;
+ if (Bcvt)
+ swabst("2b1s3i", (u_char *)entry);
+ }
+ return GOOD;
+}
+
+static int
+xattr_count(char *buffer, int *count)
+{
+ struct ext2_xattr_entry *entry;
+ int result = 0;
+
+ /* list the attribute names */
+ for (entry = FIRST_ENTRY(buffer); !IS_LAST_ENTRY(entry);
+ entry = EXT2_XATTR_NEXT(entry))
+ result++;
+
+ *count = result;
+ return GOOD;
+}
+
+static int
+xattr_walk(char *buffer, int (*xattr_cb)(char *, char *, int, void *), void *private)
+{
+ struct ext2_xattr_entry *entry;
+
+ /* list the attribute names */
+ for (entry = FIRST_ENTRY(buffer); !IS_LAST_ENTRY(entry);
+ entry = EXT2_XATTR_NEXT(entry)) {
+ char name[XATTR_MAXSIZE], value[XATTR_MAXSIZE];
+ int off;
+
+ switch (entry->e_name_index) {
+ case EXT2_XATTR_INDEX_USER:
+ strcpy(name, "user.");
+ break;
+ case EXT2_XATTR_INDEX_POSIX_ACL_ACCESS:
+ case EXT2_XATTR_INDEX_POSIX_ACL_DEFAULT:
+ strcpy(name, "system.");
+ break;
+ case EXT2_XATTR_INDEX_TRUSTED:
+ strcpy(name, "trusted.");
+ break;
+ case EXT2_XATTR_INDEX_LUSTRE:
+ strcpy(name, "lustre.");
+ break;
+ case EXT2_XATTR_INDEX_SECURITY:
+ strcpy(name, "security.");
+ break;
+ default:
+ fprintf(stderr, "Unknown EA index\n");
+ return FAIL;
+ }
+
+ off = strlen(name);
+ memcpy(name + off, entry->e_name, entry->e_name_len);
+ name[off + entry->e_name_len] = '\0';
+
+
+ memcpy(value, buffer + VALUE_OFFSET(buffer, entry), entry->e_value_size);
+
+ if (xattr_cb(name, value, entry->e_value_size, private) != GOOD)
+ return FAIL;
+ }
+
+ return GOOD;
+}
+
+int
+xattr_compare(char *path, char *buffer)
+{
+ int countf, countt;
+ char *names = NULL, *end_names, *name;
+
+ countf = llistxattr(path, NULL, 0);
+ if (countf < 0) {
+ warn("%s: llistxattr failed", path);
+ return FAIL;
+ }
+
+ names = malloc(countf + 1);
+ if (!names) {
+ warn("%s: llistxattr failed", path);
+ return FAIL;
+ }
+
+ countf = llistxattr(path, names, countf);
+ if (countf < 0) {
+ warn("%s: llistxattr failed", path);
+ free(names);
+ return FAIL;
+ }
+
+ names[countf] = '\0';
+ end_names = names + countf;
+
+ countf = 0;
+ for (name = names; name != end_names; name = strchr(name, '\0') + 1) {
+ if (!*name)
+ continue;
+ countf++;
+ }
+
+ free(names);
+
+ if (buffer) {
+ if (xattr_verify(buffer) == FAIL)
+ return FAIL;
+
+ if (xattr_count(buffer, &countt) == FAIL)
+ return FAIL;
+ }
+ else
+ countt = 0;
+
+ if (countf != countt) {
+ fprintf(stderr, "%s: EA count changed from %d to %d\n", path, countt, countf);
+ return FAIL;
+ }
+
+ if (!buffer)
+ return GOOD;
+
+ return xattr_walk(buffer, xattr_cb_compare, path);
+}
+
+int
+xattr_extract(char *path, char *buffer)
+{
+ if (dflag) {
+ fprintf(stderr, "xattr_extract(%s)\n", path);
+ xattr_walk(buffer, xattr_cb_list, NULL);
+ }
+
+ if (xattr_verify(buffer) == FAIL)
+ return FAIL;
+
+ return xattr_walk(buffer, xattr_cb_set, path);
+}
+
git.wh0rd.org / dump.git / commitdiff
