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52 lines
1.2 KiB
52 lines
1.2 KiB
4 months ago
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package unix
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import "fmt"
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// Unveil implements the unveil syscall.
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// For more information see unveil(2).
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// Note that the special case of blocking further
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// unveil calls is handled by UnveilBlock.
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func Unveil(path string, flags string) error {
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if err := supportsUnveil(); err != nil {
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return err
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}
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pathPtr, err := BytePtrFromString(path)
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if err != nil {
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return err
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}
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flagsPtr, err := BytePtrFromString(flags)
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if err != nil {
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return err
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}
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return unveil(pathPtr, flagsPtr)
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}
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// UnveilBlock blocks future unveil calls.
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// For more information see unveil(2).
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func UnveilBlock() error {
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if err := supportsUnveil(); err != nil {
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return err
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}
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return unveil(nil, nil)
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}
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// supportsUnveil checks for availability of the unveil(2) system call based
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// on the running OpenBSD version.
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func supportsUnveil() error {
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maj, min, err := majmin()
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if err != nil {
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return err
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}
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// unveil is not available before 6.4
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if maj < 6 || (maj == 6 && min <= 3) {
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return fmt.Errorf("cannot call Unveil on OpenBSD %d.%d", maj, min)
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}
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return nil
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}
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