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Current File : /opt/golang/1.22.0/src/cmd/vendor/golang.org/x/sys/unix/xattr_bsd.go

// Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build freebsd || netbsd

package unix

import (
	"strings"
	"unsafe"
)

// Derive extattr namespace and attribute name

func xattrnamespace(fullattr string) (ns int, attr string, err error) {
	s := strings.IndexByte(fullattr, '.')
	if s == -1 {
		return -1, "", ENOATTR
	}

	namespace := fullattr[0:s]
	attr = fullattr[s+1:]

	switch namespace {
	case "user":
		return EXTATTR_NAMESPACE_USER, attr, nil
	case "system":
		return EXTATTR_NAMESPACE_SYSTEM, attr, nil
	default:
		return -1, "", ENOATTR
	}
}

func initxattrdest(dest []byte, idx int) (d unsafe.Pointer) {
	if len(dest) > idx {
		return unsafe.Pointer(&dest[idx])
	}
	if dest != nil {
		// extattr_get_file and extattr_list_file treat NULL differently from
		// a non-NULL pointer of length zero. Preserve the property of nilness,
		// even if we can't use dest directly.
		return unsafe.Pointer(&_zero)
	}
	return nil
}

// FreeBSD and NetBSD implement their own syscalls to handle extended attributes

func Getxattr(file string, attr string, dest []byte) (sz int, err error) {
	d := initxattrdest(dest, 0)
	destsize := len(dest)

	nsid, a, err := xattrnamespace(attr)
	if err != nil {
		return -1, err
	}

	return ExtattrGetFile(file, nsid, a, uintptr(d), destsize)
}

func Fgetxattr(fd int, attr string, dest []byte) (sz int, err error) {
	d := initxattrdest(dest, 0)
	destsize := len(dest)

	nsid, a, err := xattrnamespace(attr)
	if err != nil {
		return -1, err
	}

	return ExtattrGetFd(fd, nsid, a, uintptr(d), destsize)
}

func Lgetxattr(link string, attr string, dest []byte) (sz int, err error) {
	d := initxattrdest(dest, 0)
	destsize := len(dest)

	nsid, a, err := xattrnamespace(attr)
	if err != nil {
		return -1, err
	}

	return ExtattrGetLink(link, nsid, a, uintptr(d), destsize)
}

// flags are unused on FreeBSD

func Fsetxattr(fd int, attr string, data []byte, flags int) (err error) {
	var d unsafe.Pointer
	if len(data) > 0 {
		d = unsafe.Pointer(&data[0])
	}
	datasiz := len(data)

	nsid, a, err := xattrnamespace(attr)
	if err != nil {
		return
	}

	_, err = ExtattrSetFd(fd, nsid, a, uintptr(d), datasiz)
	return
}

func Setxattr(file string, attr string, data []byte, flags int) (err error) {
	var d unsafe.Pointer
	if len(data) > 0 {
		d = unsafe.Pointer(&data[0])
	}
	datasiz := len(data)

	nsid, a, err := xattrnamespace(attr)
	if err != nil {
		return
	}

	_, err = ExtattrSetFile(file, nsid, a, uintptr(d), datasiz)
	return
}

func Lsetxattr(link string, attr string, data []byte, flags int) (err error) {
	var d unsafe.Pointer
	if len(data) > 0 {
		d = unsafe.Pointer(&data[0])
	}
	datasiz := len(data)

	nsid, a, err := xattrnamespace(attr)
	if err != nil {
		return
	}

	_, err = ExtattrSetLink(link, nsid, a, uintptr(d), datasiz)
	return
}

func Removexattr(file string, attr string) (err error) {
	nsid, a, err := xattrnamespace(attr)
	if err != nil {
		return
	}

	err = ExtattrDeleteFile(file, nsid, a)
	return
}

func Fremovexattr(fd int, attr string) (err error) {
	nsid, a, err := xattrnamespace(attr)
	if err != nil {
		return
	}

	err = ExtattrDeleteFd(fd, nsid, a)
	return
}

func Lremovexattr(link string, attr string) (err error) {
	nsid, a, err := xattrnamespace(attr)
	if err != nil {
		return
	}

	err = ExtattrDeleteLink(link, nsid, a)
	return
}

func Listxattr(file string, dest []byte) (sz int, err error) {
	destsiz := len(dest)

	// FreeBSD won't allow you to list xattrs from multiple namespaces
	s, pos := 0, 0
	for _, nsid := range [...]int{EXTATTR_NAMESPACE_USER, EXTATTR_NAMESPACE_SYSTEM} {
		stmp, e := ListxattrNS(file, nsid, dest[pos:])

		/* Errors accessing system attrs are ignored so that
		 * we can implement the Linux-like behavior of omitting errors that
		 * we don't have read permissions on
		 *
		 * Linux will still error if we ask for user attributes on a file that
		 * we don't have read permissions on, so don't ignore those errors
		 */
		if e != nil {
			if e == EPERM && nsid != EXTATTR_NAMESPACE_USER {
				continue
			}
			return s, e
		}

		s += stmp
		pos = s
		if pos > destsiz {
			pos = destsiz
		}
	}

	return s, nil
}

func ListxattrNS(file string, nsid int, dest []byte) (sz int, err error) {
	d := initxattrdest(dest, 0)
	destsiz := len(dest)

	s, e := ExtattrListFile(file, nsid, uintptr(d), destsiz)
	if e != nil {
		return 0, err
	}

	return s, nil
}

func Flistxattr(fd int, dest []byte) (sz int, err error) {
	destsiz := len(dest)

	s, pos := 0, 0
	for _, nsid := range [...]int{EXTATTR_NAMESPACE_USER, EXTATTR_NAMESPACE_SYSTEM} {
		stmp, e := FlistxattrNS(fd, nsid, dest[pos:])

		if e != nil {
			if e == EPERM && nsid != EXTATTR_NAMESPACE_USER {
				continue
			}
			return s, e
		}

		s += stmp
		pos = s
		if pos > destsiz {
			pos = destsiz
		}
	}

	return s, nil
}

func FlistxattrNS(fd int, nsid int, dest []byte) (sz int, err error) {
	d := initxattrdest(dest, 0)
	destsiz := len(dest)

	s, e := ExtattrListFd(fd, nsid, uintptr(d), destsiz)
	if e != nil {
		return 0, err
	}

	return s, nil
}

func Llistxattr(link string, dest []byte) (sz int, err error) {
	destsiz := len(dest)

	s, pos := 0, 0
	for _, nsid := range [...]int{EXTATTR_NAMESPACE_USER, EXTATTR_NAMESPACE_SYSTEM} {
		stmp, e := LlistxattrNS(link, nsid, dest[pos:])

		if e != nil {
			if e == EPERM && nsid != EXTATTR_NAMESPACE_USER {
				continue
			}
			return s, e
		}

		s += stmp
		pos = s
		if pos > destsiz {
			pos = destsiz
		}
	}

	return s, nil
}

func LlistxattrNS(link string, nsid int, dest []byte) (sz int, err error) {
	d := initxattrdest(dest, 0)
	destsiz := len(dest)

	s, e := ExtattrListLink(link, nsid, uintptr(d), destsiz)
	if e != nil {
		return 0, err
	}

	return s, nil
}

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