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Source file src/syscall/sockcmsg_linux.go

Documentation: syscall

  // 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)(cmsgData(h))) = *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
  }
  

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