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// Copyright 2011 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.

// Socket control messages

package syscall

import (

        "unsafe"

)

// UnixCredentials encodes credentials into a socket control message

// for sending to another process. This can be used for

// authentication.

func UnixCredentials(ucred *Ucred) []byte {

        buf := make([]byte, CmsgSpace(SizeofUcred))

        cmsg := (*Cmsghdr)(unsafe.Pointer(&buf[0]))

        cmsg.Level = SOL_SOCKET

        cmsg.Type = SCM_CREDENTIALS

        cmsg.SetLen(CmsgLen(SizeofUcred))

        *((*Ucred)(cmsgData(cmsg))) = *ucred

        return buf

}

// ParseUnixCredentials decodes a socket control message that contains

// credentials in a Ucred structure. To receive such a message, the

// SO_PASSCRED option must be enabled on the socket.

func ParseUnixCredentials(msg *SocketControlMessage) (*Ucred, error) {

        if msg.Header.Level != SOL_SOCKET {

                return nil, EINVAL

        }

        if msg.Header.Type != SCM_CREDENTIALS {

                return nil, EINVAL

        }

        ucred := *(*Ucred)(unsafe.Pointer(&msg.Data[0]))

        return &ucred, nil

}