rss-tools/vendor/golang.org/x/sys/unix/unveil_openbsd.go (view raw)
| 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 | } |