| // 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, int) { |
| 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, 0 |
| } |
