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