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Source file src/syscall/sockcmsg_linux.go

     1	// Copyright 2011 The Go Authors. All rights reserved.
     2	// Use of this source code is governed by a BSD-style
     3	// license that can be found in the LICENSE file.
     4	
     5	// Socket control messages
     6	
     7	package syscall
     8	
     9	import "unsafe"
    10	
    11	// UnixCredentials encodes credentials into a socket control message
    12	// for sending to another process. This can be used for
    13	// authentication.
    14	func UnixCredentials(ucred *Ucred) []byte {
    15		b := make([]byte, CmsgSpace(SizeofUcred))
    16		h := (*Cmsghdr)(unsafe.Pointer(&b[0]))
    17		h.Level = SOL_SOCKET
    18		h.Type = SCM_CREDENTIALS
    19		h.SetLen(CmsgLen(SizeofUcred))
    20		*((*Ucred)(cmsgData(h))) = *ucred
    21		return b
    22	}
    23	
    24	// ParseUnixCredentials decodes a socket control message that contains
    25	// credentials in a Ucred structure. To receive such a message, the
    26	// SO_PASSCRED option must be enabled on the socket.
    27	func ParseUnixCredentials(m *SocketControlMessage) (*Ucred, error) {
    28		if m.Header.Level != SOL_SOCKET {
    29			return nil, EINVAL
    30		}
    31		if m.Header.Type != SCM_CREDENTIALS {
    32			return nil, EINVAL
    33		}
    34		if uintptr(len(m.Data)) < unsafe.Sizeof(Ucred{}) {
    35			return nil, EINVAL
    36		}
    37		ucred := *(*Ucred)(unsafe.Pointer(&m.Data[0]))
    38		return &ucred, nil
    39	}
    40	

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