forked from toolshed/abra
59 lines
1.7 KiB
Go
59 lines
1.7 KiB
Go
// Copyright 2024 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 unix
|
|
|
|
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
|
|
}
|
|
ucred := *(*Ucred)(unsafe.Pointer(&m.Data[0]))
|
|
return &ucred, nil
|
|
}
|
|
|
|
// PktInfo4 encodes Inet4Pktinfo into a socket control message of type IP_PKTINFO.
|
|
func PktInfo4(info *Inet4Pktinfo) []byte {
|
|
b := make([]byte, CmsgSpace(SizeofInet4Pktinfo))
|
|
h := (*Cmsghdr)(unsafe.Pointer(&b[0]))
|
|
h.Level = SOL_IP
|
|
h.Type = IP_PKTINFO
|
|
h.SetLen(CmsgLen(SizeofInet4Pktinfo))
|
|
*(*Inet4Pktinfo)(h.data(0)) = *info
|
|
return b
|
|
}
|
|
|
|
// PktInfo6 encodes Inet6Pktinfo into a socket control message of type IPV6_PKTINFO.
|
|
func PktInfo6(info *Inet6Pktinfo) []byte {
|
|
b := make([]byte, CmsgSpace(SizeofInet6Pktinfo))
|
|
h := (*Cmsghdr)(unsafe.Pointer(&b[0]))
|
|
h.Level = SOL_IPV6
|
|
h.Type = IPV6_PKTINFO
|
|
h.SetLen(CmsgLen(SizeofInet6Pktinfo))
|
|
*(*Inet6Pktinfo)(h.data(0)) = *info
|
|
return b
|
|
}
|