-
Copyright (c) 2000, 2001 Robert N. M. Watson
Copyright (c) 2002 Networks Associates Technology, Inc.
All rights reserved.
This software was developed for the FreeBSD Project by Poul-Henning
Kamp and Network Associates Laboratories, the Security Research Division
of Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
("CBOSS"), as part of the DARPA CHATS research program
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.
THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
$FreeBSD: src/usr.sbin/extattr/rmextattr.8,v 1.4 2003/02/24 22:53:25 ru Exp $
.Dd January 2, 2005 .Dt GETEXTATTR 1 .Os .Sh NAME .Nm getextattr , .Nm lsextattr , .Nm rmextattr , .Nm setextattr .Nd manipulate extended attributes .Sh SYNOPSIS .Nm getextattr .Op Fl fhq .Op Fl s | Fl x | Fl v Ar style .Op Ar namespace .Ar attrname .Ar filename ... .Nm lsextattr .Op Fl fhq .Ar namespace .Ar filename ... .Nm rmextattr .Op Fl fhq .Op Ar namespace .Ar attrname .Ar filename ... .Nm setextattr .Op Fl fhnq .Op Ar namespace .Ar attrname .Ar attrvalue .Ar filename ... .Nm setextattr .Op Fl fhnq .Fl i Ar valuefile .Op Ar namespace .Ar attrname .Ar filename ... .Sh DESCRIPTION These utilities are user tools to manipulate the named extended attributes on files and directories.
p The .Ar namespace argument should be the namespace of the attribute to retrieve: legal values are .Cm user and .Cm system . For all operations except .Nm lsextattr , the namespace argument may be omitted if the attribute name is namespace prefixed, like in .Cm user.test . In that later case, the .Cm user namespace prefix obviously selects .Cm user namespace. .Cm system , .Cm security , and .Cm trusted namespace prefixes select the .Cm system namespace.
p The .Ar attrname argument should be the name of the attribute, .Ar filename the name of the target file or directory, .Ar attrvalue a string to store in the attribute.
p The following options are available: l -tag -width indent t Fl f (Force.) Ignore errors on individual filenames and continue with the remaining arguments. t Fl h (No follow.) If the file is a symbolic link, perform the operation on the link itself rather than the file that the link points to. t Fl i Ar valuefile (Input file.) Read the attribute value from file .Ar valuefile . Use this flag in order to set a binary value for an attribute. t Fl n .Dv ( NUL Ns -terminate.) .Dv NUL Ns -terminate the extent content written out. t Fl q (Quiet.) Do not print out the pathname and suppress error messages. t Fl s (Stringify.) Escape nonprinting characters and put quotes around the output. t Fl v Ar style (Visual.) Process the attribute value through .Xr vis 3 , using .Ar style . Valid values for .Ar style are: l -tag -width indent t Ar default Use default .Xr vis 3 encoding. t Ar c Use C-style backslash sequences, like in .Nm vis Fl c . t Ar http Use URI encoding from RFC 1808, like in .Nm vis Fl h . t Ar octal Display in octal, like in .Nm vis Fl o . t Ar vis Alias for .Ar default . t Ar cstyle Alias for .Ar c . t Ar httpstyle Alias for .Ar http . .El t Fl x (Hex.) Print the output in hexadecimal. .El .Sh EXAMPLES d -literal setextattr system md5 `md5 -q /boot/kernel/kernel` /boot/kernel/kernel getextattr system md5 /boot/kernel/kernel lsextattr system /boot/kernel/kernel rmextattr system md5 /boot/kernel/kernel .Ed
p
Examples omitting namespace (and attribute value) argument:
d -literal setextattr -i valuefile trusted.gfid /export/wd3a
getextattr -x trusted.gfid /export/wd3a
.Ed
.Sh SEE ALSO
.Xr extattr 2 ,
.Xr extattr 3 ,
.Xr extattrctl 8 ,
.Xr extattr 9
.Sh HISTORY
Extended attribute support was developed as part of the
.Tn TrustedBSD
Project,
and introduced in
.Fx 5.0
and
.Nx 3.0 .
It was developed to support security extensions requiring additional labels
to be associated with each file or directory.
p Extended attribute support was resurrected and made more usable in .Nx 5.2 . .Sh AUTHORS .An Robert N M Watson .An Poul-Henning Kamp .An Emmanuel Dreyfus