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