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glibc/hurd/xattr.c
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/* Support for *xattr interfaces on GNU/Hurd. | |
Copyright (C) 2006-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <hurd.h> | |
#include <hurd/xattr.h> | |
#include <string.h> | |
#include <sys/mman.h> | |
/* Right now we support only a fixed set of xattr names for Hurd features. | |
There are no RPC interfaces for free-form xattr names and values. | |
Name Value encoding | |
---- ----- -------- | |
gnu.author empty if st_author==st_uid | |
uid_t giving st_author value | |
gnu.translator empty if no passive translator | |
translator and arguments: "/hurd/foo\0arg1\0arg2\0" | |
*/ | |
error_t | |
_hurd_xattr_get (io_t port, const char *name, void *value, size_t *size) | |
{ | |
if (strncmp (name, "gnu.", 4)) | |
return EOPNOTSUPP; | |
name += 4; | |
if (!strcmp (name, "author")) | |
{ | |
struct stat64 st; | |
error_t err = __io_stat (port, &st); | |
if (err) | |
return err; | |
if (st.st_author == st.st_uid) | |
*size = 0; | |
else if (value) | |
{ | |
if (*size < sizeof st.st_author) | |
return ERANGE; | |
memcpy (value, &st.st_author, sizeof st.st_author); | |
} | |
*size = sizeof st.st_author; | |
return 0; | |
} | |
if (!strcmp (name, "translator")) | |
{ | |
char *buf = value; | |
size_t bufsz = value ? *size : 0; | |
error_t err = __file_get_translator (port, &buf, &bufsz); | |
if (err) | |
return err; | |
if (value != NULL && *size < bufsz) | |
{ | |
if (buf != value) | |
munmap (buf, bufsz); | |
return -ERANGE; | |
} | |
if (buf != value && bufsz > 0) | |
{ | |
if (value != NULL) | |
memcpy (value, buf, bufsz); | |
munmap (buf, bufsz); | |
} | |
*size = bufsz; | |
return 0; | |
} | |
return EOPNOTSUPP; | |
} | |
error_t | |
_hurd_xattr_set (io_t port, const char *name, const void *value, size_t size, | |
int flags) | |
{ | |
if (strncmp (name, "gnu.", 4)) | |
return EOPNOTSUPP; | |
name += 4; | |
if (!strcmp (name, "author")) | |
switch (size) | |
{ | |
default: | |
return EINVAL; | |
case 0: /* "Clear" author by setting to st_uid. */ | |
{ | |
struct stat64 st; | |
error_t err = __io_stat (port, &st); | |
if (err) | |
return err; | |
if (st.st_author == st.st_uid) | |
{ | |
/* Nothing to do. */ | |
if (flags & XATTR_REPLACE) | |
return ENODATA; | |
return 0; | |
} | |
if (flags & XATTR_CREATE) | |
return EEXIST; | |
return __file_chauthor (port, st.st_uid); | |
} | |
case sizeof (uid_t): /* Set the author. */ | |
{ | |
uid_t id; | |
memcpy (&id, value, sizeof id); | |
if (flags & (XATTR_CREATE|XATTR_REPLACE)) | |
{ | |
struct stat64 st; | |
error_t err = __io_stat (port, &st); | |
if (err) | |
return err; | |
if (st.st_author == st.st_uid) | |
{ | |
if (flags & XATTR_REPLACE) | |
return ENODATA; | |
} | |
else if (flags & XATTR_CREATE) | |
return EEXIST; | |
if (st.st_author == id) | |
/* Nothing to do. */ | |
return 0; | |
} | |
return __file_chauthor (port, id); | |
} | |
} | |
if (!strcmp (name, "translator")) | |
{ | |
if (flags & XATTR_REPLACE) | |
{ | |
/* Must make sure it's already there. */ | |
char *buf = NULL; | |
size_t bufsz = 0; | |
error_t err = __file_get_translator (port, &buf, &bufsz); | |
if (err) | |
return err; | |
if (bufsz > 0) | |
{ | |
munmap (buf, bufsz); | |
return ENODATA; | |
} | |
} | |
return __file_set_translator (port, | |
FS_TRANS_SET | ((flags & XATTR_CREATE) | |
? FS_TRANS_EXCL : 0), 0, 0, | |
value, size, | |
MACH_PORT_NULL, MACH_MSG_TYPE_COPY_SEND); | |
} | |
return EOPNOTSUPP; | |
} | |
error_t | |
_hurd_xattr_remove (io_t port, const char *name) | |
{ | |
return _hurd_xattr_set (port, name, NULL, 0, XATTR_REPLACE); | |
} | |
error_t | |
_hurd_xattr_list (io_t port, void *buffer, size_t *size) | |
{ | |
size_t total = 0; | |
char *bufp = buffer; | |
inline void add (const char *name, size_t len) | |
{ | |
total += len; | |
if (bufp != NULL && total <= *size) | |
bufp = __mempcpy (bufp, name, len); | |
} | |
#define add(s) add (s, sizeof s) | |
struct stat64 st; | |
error_t err = __io_stat (port, &st); | |
if (err) | |
return err; | |
if (st.st_author != st.st_uid) | |
add ("gnu.author"); | |
if (st.st_mode & S_IPTRANS) | |
add ("gnu.translator"); | |
if (buffer != NULL && total > *size) | |
return ERANGE; | |
*size = total; | |
return 0; | |
} |