1 // Copyright 2012 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.
16 "golang.org/x/sys/unix"
19 // TestSCMCredentials tests the sending and receiving of credentials
20 // (PID, UID, GID) in an ancillary message between two UNIX
21 // sockets. The SO_PASSCRED socket option is enabled on the sending
22 // socket for this to work.
23 func TestSCMCredentials(t *testing.T) {
24 fds, err := unix.Socketpair(unix.AF_LOCAL, unix.SOCK_STREAM, 0)
26 t.Fatalf("Socketpair: %v", err)
28 defer unix.Close(fds[0])
29 defer unix.Close(fds[1])
31 err = unix.SetsockoptInt(fds[0], unix.SOL_SOCKET, unix.SO_PASSCRED, 1)
33 t.Fatalf("SetsockoptInt: %v", err)
36 srvFile := os.NewFile(uintptr(fds[0]), "server")
38 srv, err := net.FileConn(srvFile)
40 t.Errorf("FileConn: %v", err)
45 cliFile := os.NewFile(uintptr(fds[1]), "client")
47 cli, err := net.FileConn(cliFile)
49 t.Errorf("FileConn: %v", err)
56 ucred.Pid = int32(os.Getpid())
59 oob := unix.UnixCredentials(&ucred)
60 _, _, err := cli.(*net.UnixConn).WriteMsgUnix(nil, oob, nil)
61 if op, ok := err.(*net.OpError); ok {
64 if sys, ok := err.(*os.SyscallError); ok {
67 if err != syscall.EPERM {
68 t.Fatalf("WriteMsgUnix failed with %v, want EPERM", err)
72 ucred.Pid = int32(os.Getpid())
73 ucred.Uid = uint32(os.Getuid())
74 ucred.Gid = uint32(os.Getgid())
75 oob := unix.UnixCredentials(&ucred)
77 // this is going to send a dummy byte
78 n, oobn, err := cli.(*net.UnixConn).WriteMsgUnix(nil, oob, nil)
80 t.Fatalf("WriteMsgUnix: %v", err)
83 t.Fatalf("WriteMsgUnix n = %d, want 0", n)
86 t.Fatalf("WriteMsgUnix oobn = %d, want %d", oobn, len(oob))
89 oob2 := make([]byte, 10*len(oob))
90 n, oobn2, flags, _, err := srv.(*net.UnixConn).ReadMsgUnix(nil, oob2)
92 t.Fatalf("ReadMsgUnix: %v", err)
95 t.Fatalf("ReadMsgUnix flags = 0x%x, want 0", flags)
98 t.Fatalf("ReadMsgUnix n = %d, want 1 (dummy byte)", n)
101 // without SO_PASSCRED set on the socket, ReadMsgUnix will
102 // return zero oob bytes
103 t.Fatalf("ReadMsgUnix oobn = %d, want %d", oobn2, oobn)
106 if !bytes.Equal(oob, oob2) {
107 t.Fatal("ReadMsgUnix oob bytes don't match")
110 scm, err := unix.ParseSocketControlMessage(oob2)
112 t.Fatalf("ParseSocketControlMessage: %v", err)
114 newUcred, err := unix.ParseUnixCredentials(&scm[0])
116 t.Fatalf("ParseUnixCredentials: %v", err)
118 if *newUcred != ucred {
119 t.Fatalf("ParseUnixCredentials = %+v, want %+v", newUcred, ucred)