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New attr userspace package - transition to the trusted namespace for XFS,
Add in the new attribute copying routines from Andreas, and also update
the license info in the syscall man pages so that other folks can use em
too.
New attr userspace package - transition to the trusted namespace for XFS,
Add in the new attribute copying routines from Andreas, and also update
the license info in the syscall man pages so that other folks can use em
too.

/*
 * Copyright (c) 2001-2002 Silicon Graphics, Inc.  All Rights Reserved.
 * 
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2.1 of the GNU Lesser General Public License
 * as published by the Free Software Foundation.
 * 
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * 
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this program; if not, write the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston MA 02111-1307,
 * USA.
 * 
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 * 
 * http://www.sgi.com 
 * 
 * For further information regarding this notice, see: 
 * 
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <asm/types.h>

#include <attr/xattr.h>
#include <attr/attributes.h>

#undef MAXNAMELEN
#define MAXNAMELEN 256

/*
 * Convert IRIX API components into Linux/XFS API components
 */
static int
api_convert(char *name, const char *irixname, int irixflags)
{
	static const char *user_name = "user.";
	static const char *trusted_name = "trusted.";
	static const char *xfsroot_name = "xfsroot.";
	static int compat = -1;

	if (compat == -1)
		compat = (getenv("COMPAT_XFSROOT") != NULL);

	if (strlen(irixname) >= MAXNAMELEN) {
		errno = EINVAL;
		return -1;
	}
	if (irixflags & ATTR_ROOT) {
		if (compat)
			strcpy(name, xfsroot_name);
		else
			strcpy(name, trusted_name);
	} else {
		strcpy(name, user_name);
	}
	strcat(name, irixname);
	return 0;
}

int
attr_get(const char *path, const char *attrname, char *attrvalue,
	 int *valuelength, int flags)
{
	int c;
	char name[MAXNAMELEN+16];

	if ((c = api_convert(name, attrname, flags)) < 0)
		return c;
	if (flags & ATTR_DONTFOLLOW)
		c = lgetxattr(path, name, attrvalue, *valuelength);
	else
		c =  getxattr(path, name, attrvalue, *valuelength);
	if (c < 0)
		return c;
	*valuelength = c;
	return 0;
}

int
attr_getf(int fd, const char *attrname, char *attrvalue,
	  int *valuelength, int flags)
{
	int c;
	char name[MAXNAMELEN+16];

	if ((c = api_convert(name, attrname, flags)) < 0)
		return c;
	c = fgetxattr(fd, name, attrvalue, *valuelength);
	if (c < 0)
		return c;
	*valuelength = c;
	return 0;
}

int
attr_set(const char *path, const char *attrname, const char *attrvalue,
	 const int valuelength, int flags)
{
	int c, lflags = 0;
	char name[MAXNAMELEN+16];
	void *buffer = (void *)attrvalue;

	if (flags & ATTR_CREATE)
		lflags = XATTR_CREATE;
	else if (flags & ATTR_REPLACE)
		lflags = XATTR_REPLACE;

	if ((c = api_convert(name, attrname, flags)) < 0)
		return c;
	if (flags & ATTR_DONTFOLLOW)
		return lsetxattr(path, name, buffer, valuelength, lflags);
	return setxattr(path, name, buffer, valuelength, lflags);
}

int
attr_setf(int fd, const char *attrname,
	  const char *attrvalue, const int valuelength, int flags)
{
	int c, lflags = 0;
	char name[MAXNAMELEN+16];
	void *buffer = (void *)attrvalue;

	if (flags & ATTR_CREATE)
		lflags = XATTR_CREATE;
	else if (flags & ATTR_REPLACE)
		lflags = XATTR_REPLACE;

	if ((c = api_convert(name, attrname, flags)) < 0)
		return c;
	return fsetxattr(fd, name, buffer, valuelength, lflags);
}

int
attr_remove(const char *path, const char *attrname, int flags)
{
	int c;
	char name[MAXNAMELEN+16];

	if ((c = api_convert(name, attrname, flags)) < 0)
		return c;
	if (flags & ATTR_DONTFOLLOW)
		return lremovexattr(path, name);
	return removexattr(path, name);
}

int
attr_removef(int fd, const char *attrname, int flags)
{
	int c;
	char name[MAXNAMELEN+16];

	if ((c = api_convert(name, attrname, flags)) < 0)
		return c;
	return fremovexattr(fd, name);
}


/*
 * Helper routines for the attr_multi functions.  In IRIX, the
 * multi routines are a single syscall - in Linux, we break em
 * apart in userspace and make individual syscalls for each.
 */

static int
attr_single(const char *path, attr_multiop_t *op, int flags)
{
	int r = -1;

	errno = -EINVAL;
	flags |= op->am_flags;
	if (op->am_opcode & ATTR_OP_GET)
		r = attr_get(path, op->am_attrname, op->am_attrvalue,
				&op->am_length, flags);
	else if (op->am_opcode & ATTR_OP_SET)
		r = attr_set(path, op->am_attrname, op->am_attrvalue,
				op->am_length, flags);
	else if (op->am_opcode & ATTR_OP_REMOVE)
		r = attr_remove(path, op->am_attrname, flags);
	return r;
}

static int
attr_singlef(const int fd, attr_multiop_t *op, int flags)
{
	int r = -1;

	errno = -EINVAL;
	flags |= op->am_flags;
	if (op->am_opcode & ATTR_OP_GET)
		r = attr_getf(fd, op->am_attrname, op->am_attrvalue,
				&op->am_length, flags);
	else if (op->am_opcode & ATTR_OP_SET)
		r = attr_setf(fd, op->am_attrname, op->am_attrvalue,
				op->am_length, flags);
	else if (op->am_opcode & ATTR_OP_REMOVE)
		r = attr_removef(fd, op->am_attrname, flags);
	return r;
}

/*
 * Operate on multiple attributes of the same object simultaneously
 * 
 * From the manpage: "attr_multi will fail if ... a bit other than
 * ATTR_DONTFOLLOW was set in the flag argument." flags must be
 * checked here as they are not passed into the kernel.
 */
int
attr_multi(const char *path, attr_multiop_t *multiops, int count, int flags)
{
	int i, tmp, r = -1;

	errno = EINVAL;
	if ((flags & ATTR_DONTFOLLOW) != flags)
		return r;

	r = errno = 0;
	for (i = 0; i < count; i++) {
		tmp = attr_single(path, &multiops[i], flags);
		if (tmp) r = tmp;
	}
	return r;
}

int
attr_multif(int fd, attr_multiop_t *multiops, int count, int flags)
{
	int i, tmp, r = -1;

	errno = EINVAL;
	if ((flags & ATTR_DONTFOLLOW) != flags)
		return r;

	r = errno = 0;
	for (i = 0; i < count; i++) {
		tmp = attr_singlef(fd, &multiops[i], flags);
		if (tmp) r = tmp;
	}
	return r;
}