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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
}