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//go:build linux
// +build linux
package netlink
import (
"syscall"
"testing"
"unsafe"
"github.com/google/go-cmp/cmp"
"github.com/mdlayher/netlink/nlenc"
"golang.org/x/sys/unix"
)
func TestHeaderMemoryLayoutLinux(t *testing.T) {
var nh Header
var sh syscall.NlMsghdr
if want, got := unsafe.Sizeof(sh), unsafe.Sizeof(nh); want != got {
t.Fatalf("unexpected structure sizes:\n- want: %v\n- got: %v",
want, got)
}
sh = syscall.NlMsghdr{
Len: 0x10101010,
Type: 0x2020,
Flags: 0x3030,
Seq: 0x40404040,
Pid: 0x50505050,
}
nh = sysToHeader(sh)
if want, got := sh.Len, nh.Length; want != got {
t.Fatalf("unexpected header length:\n- want: %v\n- got: %v",
want, got)
}
if want, got := sh.Type, uint16(nh.Type); want != got {
t.Fatalf("unexpected header type:\n- want: %v\n- got: %v",
want, got)
}
if want, got := sh.Flags, uint16(nh.Flags); want != got {
t.Fatalf("unexpected header flags:\n- want: %v\n- got: %v",
want, got)
}
if want, got := sh.Seq, nh.Sequence; want != got {
t.Fatalf("unexpected header sequence:\n- want: %v\n- got: %v",
want, got)
}
if want, got := sh.Pid, nh.PID; want != got {
t.Fatalf("unexpected header PID:\n- want: %v\n- got: %v",
want, got)
}
}
func Test_checkMessageExtendedAcknowledgementTLVs(t *testing.T) {
tests := []struct {
name string
m Message
err *OpError
}{
{
name: "error",
m: Message{
Header: Header{
Type: Error,
// Indicate the use of extended acknowledgement.
Flags: AcknowledgeTLVs,
},
Data: packExtACK(
-1,
// The caller's request message with arbitrary bytes that we
// skip over when parsing the TLVs.
&Message{
Header: Header{Length: 4},
Data: []byte{0xff, 0xff, 0xff, 0xff},
},
// The actual extended acknowledgement TLVs.
[]Attribute{
{
Type: 1,
Data: nlenc.Bytes("bad request"),
},
{
Type: 2,
Data: nlenc.Uint32Bytes(2),
},
},
),
},
err: &OpError{
Op: "receive",
Err: unix.Errno(1),
Message: "bad request",
Offset: 2,
},
},
{
name: "done multi",
m: Message{
Header: Header{
Type: Done,
// Indicate the use of extended acknowledgement.
Flags: Multi | AcknowledgeTLVs,
},
Data: packExtACK(
-1,
// No message, straight to TLVs.
nil,
[]Attribute{
{
Type: 1,
Data: nlenc.Bytes("bad request"),
},
{
Type: 2,
Data: nlenc.Uint32Bytes(2),
},
},
),
},
err: &OpError{
Op: "receive",
Err: unix.Errno(1),
Message: "bad request",
Offset: 2,
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
if diff := cmp.Diff(tt.err, checkMessage(tt.m)); diff != "" {
t.Fatalf("unexpected OpError (-want +got):\n%s", diff)
}
})
}
}
// packExtACK packs an extended acknowledgement response.
func packExtACK(errno int32, m *Message, tlvs []Attribute) []byte {
b := nlenc.Int32Bytes(errno)
if m != nil {
// Copy the header length logic from Conn.
m.Header.Length = uint32(nlmsgAlign(nlmsgLength(len(m.Data))))
mb, err := m.MarshalBinary()
if err != nil {
panicf("failed to marshal message: %v", err)
}
b = append(b, mb...)
}
ab, err := MarshalAttributes(tlvs)
if err != nil {
panicf("failed to marshal attributes: %v", err)
}
return append(b, ab...)
}
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