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unveil_openbsd.go (1217B)

      1 // Copyright 2018 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package unix
      6 
      7 import "fmt"
      8 
      9 // Unveil implements the unveil syscall.
     10 // For more information see unveil(2).
     11 // Note that the special case of blocking further
     12 // unveil calls is handled by UnveilBlock.
     13 func Unveil(path string, flags string) error {
     14 	if err := supportsUnveil(); err != nil {
     15 		return err
     16 	}
     17 	pathPtr, err := BytePtrFromString(path)
     18 	if err != nil {
     19 		return err
     20 	}
     21 	flagsPtr, err := BytePtrFromString(flags)
     22 	if err != nil {
     23 		return err
     24 	}
     25 	return unveil(pathPtr, flagsPtr)
     26 }
     27 
     28 // UnveilBlock blocks future unveil calls.
     29 // For more information see unveil(2).
     30 func UnveilBlock() error {
     31 	if err := supportsUnveil(); err != nil {
     32 		return err
     33 	}
     34 	return unveil(nil, nil)
     35 }
     36 
     37 // supportsUnveil checks for availability of the unveil(2) system call based
     38 // on the running OpenBSD version.
     39 func supportsUnveil() error {
     40 	maj, min, err := majmin()
     41 	if err != nil {
     42 		return err
     43 	}
     44 
     45 	// unveil is not available before 6.4
     46 	if maj < 6 || (maj == 6 && min <= 3) {
     47 		return fmt.Errorf("cannot call Unveil on OpenBSD %d.%d", maj, min)
     48 	}
     49 
     50 	return nil
     51 }