forked from ebhomengo/niki
52 lines
1.2 KiB
Go
52 lines
1.2 KiB
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.
|
||
|
|
|
||
|
|
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
|
||
|
|
}
|