lib/sysxattrs.c

   1 /*
   2  * Extended attribute support for rsync.
   3  *
   4  * Copyright (C) 2004 Red Hat, Inc.
   5  * Written by Jay Fenlason.
   6  *
   7  * This program is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 3 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License along
  18  * with this program; if not, visit the http://fsf.org website.
  19  */
  20
  21 #include "rsync.h"
  22 #include "sysxattrs.h"
  23
  24 #ifdef SUPPORT_XATTRS
  25
  26 #if defined HAVE_LINUX_XATTRS
  27
  28 ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size)
  29 {
  30         return lgetxattr(path, name, value, size);
  31 }
  32
  33 ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size)
  34 {
  35         return fgetxattr(filedes, name, value, size);
  36 }
  37
  38 int sys_lsetxattr(const char *path, const char *name, const void *value, size_t size)
  39 {
  40         return lsetxattr(path, name, value, size, 0);
  41 }
  42
  43 int sys_lremovexattr(const char *path, const char *name)
  44 {
  45         return lremovexattr(path, name);
  46 }
  47
  48 ssize_t sys_llistxattr(const char *path, char *list, size_t size)
  49 {
  50         return llistxattr(path, list, size);
  51 }
  52
  53 #elif HAVE_OSX_XATTRS
  54
  55 ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size)
  56 {
  57         return getxattr(path, name, value, size, 0, XATTR_NOFOLLOW);
  58 }
  59
  60 ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size)
  61 {
  62         return fgetxattr(filedes, name, value, size, 0, 0);
  63 }
  64
  65 int sys_lsetxattr(const char *path, const char *name, const void *value, size_t size)
  66 {
  67         return setxattr(path, name, value, size, 0, XATTR_NOFOLLOW);
  68 }
  69
  70 int sys_lremovexattr(const char *path, const char *name)
  71 {
  72         return removexattr(path, name, XATTR_NOFOLLOW);
  73 }
  74
  75 ssize_t sys_llistxattr(const char *path, char *list, size_t size)
  76 {
  77         return listxattr(path, list, size, XATTR_NOFOLLOW);
  78 }
  79
  80 #elif HAVE_FREEBSD_XATTRS
  81
  82 ssize_t sys_lgetxattr(const char *path, const char *name, void *value, size_t size)
  83 {
  84         return extattr_get_link(path, EXTATTR_NAMESPACE_USER, name, value, size);
  85 }
  86
  87 ssize_t sys_fgetxattr(int filedes, const char *name, void *value, size_t size)
  88 {
  89         return extattr_get_fd(filedes, EXTATTR_NAMESPACE_USER, name, value, size);
  90 }
  91
  92 int sys_lsetxattr(const char *path, const char *name, const void *value, size_t size)
  93 {
  94         return extattr_set_link(path, EXTATTR_NAMESPACE_USER, name, value, size);
  95 }
  96
  97 int sys_lremovexattr(const char *path, const char *name)
  98 {
  99         return extattr_delete_link(path, EXTATTR_NAMESPACE_USER, name);
 100 }
 101
 102 ssize_t sys_llistxattr(const char *path, char *list, size_t size)
 103 {
 104         unsigned char keylen;
 105         ssize_t off, len = extattr_list_link(path, EXTATTR_NAMESPACE_USER, list, size);
 106
 107         if (len <= 0 || (size_t)len > size)
 108                 return len;
 109
 110         /* FreeBSD puts a single-byte length before each string, with no '\0'
 111          * terminator.  We need to change this into a series of null-terminted
 112          * strings.  Since the size is the same, we can simply transform the
 113          * output in place. */
 114         for (off = 0; off < len; off += keylen + 1) {
 115                 keylen = ((unsigned char*)list)[off];
 116                 if (off + keylen >= len) {
 117                         /* Should be impossible, but kernel bugs happen! */
 118                         errno = EINVAL;
 119                         return -1;
 120                 }
 121                 memmove(list+off, list+off+1, keylen);
 122                 list[off+keylen] = '\0';
 123         }
 124
 125         return len;
 126 }
 127
 128 #else
 129
 130 #error You need to create xattr compatibility functions.
 131
 132 #endif
 133
 134 #endif /* SUPPORT_XATTRS */