72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
package selinux
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import (
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"golang.org/x/sys/unix"
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)
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// lgetxattr returns a []byte slice containing the value of
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// an extended attribute attr set for path.
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func lgetxattr(path, attr string) ([]byte, error) {
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// Start with a 128 length byte array
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dest := make([]byte, 128)
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sz, errno := doLgetxattr(path, attr, dest)
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for errno == unix.ERANGE { //nolint:errorlint // unix errors are bare
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// Buffer too small, use zero-sized buffer to get the actual size
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sz, errno = doLgetxattr(path, attr, []byte{})
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if errno != nil {
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return nil, errno
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}
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dest = make([]byte, sz)
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sz, errno = doLgetxattr(path, attr, dest)
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}
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if errno != nil {
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return nil, errno
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}
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return dest[:sz], nil
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}
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// doLgetxattr is a wrapper that retries on EINTR
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func doLgetxattr(path, attr string, dest []byte) (int, error) {
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for {
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sz, err := unix.Lgetxattr(path, attr, dest)
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if err != unix.EINTR { //nolint:errorlint // unix errors are bare
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return sz, err
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}
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}
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}
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// getxattr returns a []byte slice containing the value of
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// an extended attribute attr set for path.
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func getxattr(path, attr string) ([]byte, error) {
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// Start with a 128 length byte array
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dest := make([]byte, 128)
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sz, errno := dogetxattr(path, attr, dest)
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for errno == unix.ERANGE { //nolint:errorlint // unix errors are bare
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// Buffer too small, use zero-sized buffer to get the actual size
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sz, errno = dogetxattr(path, attr, []byte{})
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if errno != nil {
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return nil, errno
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}
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dest = make([]byte, sz)
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sz, errno = dogetxattr(path, attr, dest)
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}
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if errno != nil {
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return nil, errno
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}
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return dest[:sz], nil
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}
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// dogetxattr is a wrapper that retries on EINTR
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func dogetxattr(path, attr string, dest []byte) (int, error) {
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for {
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sz, err := unix.Getxattr(path, attr, dest)
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if err != unix.EINTR { //nolint:errorlint // unix errors are bare
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return sz, err
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}
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}
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}
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