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// 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.
package unix
import "fmt"
// Unveil implements the unveil syscall.
// For more information see unveil(2).
// Note that the special case of blocking further
// unveil calls is handled by UnveilBlock.
func Unveil(path string, flags string) error {
if err := supportsUnveil(); err != nil {
return err
}
pathPtr, err := BytePtrFromString(path)
if err != nil {
return err
}
flagsPtr, err := BytePtrFromString(flags)
if err != nil {
return err
}
return unveil(pathPtr, flagsPtr)
}
// UnveilBlock blocks future unveil calls.
// For more information see unveil(2).
func UnveilBlock() error {
if err := supportsUnveil(); err != nil {
return err
}
return unveil(nil, nil)
}
// supportsUnveil checks for availability of the unveil(2) system call based
// on the running OpenBSD version.
func supportsUnveil() error {
maj, min, err := majmin()
if err != nil {
return err
}
// unveil is not available before 6.4
if maj < 6 || (maj == 6 && min <= 3) {
return fmt.Errorf("cannot call Unveil on OpenBSD %d.%d", maj, min)
}
return nil
}
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