mirror of
https://github.com/DNSCrypt/dnscrypt-proxy.git
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112 lines
2.3 KiB
Go
112 lines
2.3 KiB
Go
// Copyright 2016 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 (
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"errors"
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"fmt"
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"strconv"
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)
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// Pledge implements the pledge syscall.
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//
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// This changes both the promises and execpromises; use PledgePromises or
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// PledgeExecpromises to only change the promises or execpromises
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// respectively.
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//
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// For more information see pledge(2).
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func Pledge(promises, execpromises string) error {
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if err := pledgeAvailable(); err != nil {
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return err
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}
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pptr, err := BytePtrFromString(promises)
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if err != nil {
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return err
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}
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exptr, err := BytePtrFromString(execpromises)
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if err != nil {
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return err
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}
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return pledge(pptr, exptr)
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}
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// PledgePromises implements the pledge syscall.
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//
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// This changes the promises and leaves the execpromises untouched.
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//
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// For more information see pledge(2).
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func PledgePromises(promises string) error {
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if err := pledgeAvailable(); err != nil {
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return err
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}
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pptr, err := BytePtrFromString(promises)
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if err != nil {
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return err
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}
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return pledge(pptr, nil)
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}
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// PledgeExecpromises implements the pledge syscall.
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//
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// This changes the execpromises and leaves the promises untouched.
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//
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// For more information see pledge(2).
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func PledgeExecpromises(execpromises string) error {
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if err := pledgeAvailable(); err != nil {
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return err
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}
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exptr, err := BytePtrFromString(execpromises)
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if err != nil {
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return err
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}
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return pledge(nil, exptr)
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}
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// majmin returns major and minor version number for an OpenBSD system.
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func majmin() (major int, minor int, err error) {
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var v Utsname
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err = Uname(&v)
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if err != nil {
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return
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}
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major, err = strconv.Atoi(string(v.Release[0]))
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if err != nil {
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err = errors.New("cannot parse major version number returned by uname")
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return
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}
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minor, err = strconv.Atoi(string(v.Release[2]))
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if err != nil {
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err = errors.New("cannot parse minor version number returned by uname")
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return
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}
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return
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}
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// pledgeAvailable checks for availability of the pledge(2) syscall
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// based on the running OpenBSD version.
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func pledgeAvailable() 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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// Require OpenBSD 6.4 as a minimum.
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if maj < 6 || (maj == 6 && min <= 3) {
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return fmt.Errorf("cannot call Pledge on OpenBSD %d.%d", maj, min)
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}
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return nil
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}
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