// 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 { b := make([]byte, CmsgSpace(SizeofUcred)) h := (*Cmsghdr)(unsafe.Pointer(&b[0])) h.Level = SOL_SOCKET h.Type = SCM_CREDENTIALS h.SetLen(CmsgLen(SizeofUcred)) *(*Ucred)(h.data(0)) = *ucred return b } // 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(m *SocketControlMessage) (*Ucred, error) { if m.Header.Level != SOL_SOCKET { return nil, EINVAL } if m.Header.Type != SCM_CREDENTIALS { return nil, EINVAL } if uintptr(len(m.Data)) < unsafe.Sizeof(Ucred{}) { return nil, EINVAL } ucred := *(*Ucred)(unsafe.Pointer(&m.Data[0])) return &ucred, nil }