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message_test.go
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message_test.go
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package netfilter
import (
"testing"
"github.com/pkg/errors"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/mdlayher/netlink"
"github.com/mdlayher/netlink/nlenc"
)
func TestMessageUnmarshalNetlink(t *testing.T) {
tests := []struct {
name string
attrs []Attribute
h Header
msg netlink.Message
err error
}{
{
name: "netlink message too short",
msg: netlink.Message{
Data: make([]byte, nfHeaderLen-1),
},
err: errors.Wrap(errMessageLen, "unmarshaling netfilter header"),
},
{
name: "simple attribute",
msg: netlink.Message{
Data: []byte{0, 0, 0, 0, 7, 0, 0, 0, 2, 1, 0, 0xff},
},
attrs: []Attribute{
{
Type: 0,
Data: []byte{
0x02, 0x01, 0x00,
},
},
},
},
{
name: "netfilter payload too short",
msg: netlink.Message{
Data: make([]byte, nfHeaderLen+1),
},
err: errors.New("creating attribute decoder: invalid attribute; length too short or too large"),
},
{
name: "nested and byte order flags set",
msg: netlink.Message{
Data: append(
[]byte{
0, 0, 0, 0,
4, 0},
nlenc.Uint16Bytes(netlink.Nested|netlink.NetByteOrder)...,
),
},
err: errInvalidAttributeFlags,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
// Extract and parse Netfilter attributes from a Netlink message.
h, attrs, err := UnmarshalNetlink(tt.msg)
if tt.err != nil {
require.Error(t, err)
require.EqualError(t, err, tt.err.Error())
return
}
require.NoError(t, err)
assert.Equal(t, tt.attrs, attrs, "unexpected attributes")
assert.Equal(t, tt.h, h, "unexpected header")
})
}
}
func TestAttributeMarshalNetlink(t *testing.T) {
tests := []struct {
name string
attrs []Attribute
h Header
msg netlink.Message
err error
}{
{
name: "simple attribute w/ header",
h: Header{
Family: ProtoBridge,
Version: 2,
ResourceID: 3,
SubsystemID: NFSubsysIPSet,
MessageType: 123,
Flags: netlink.Root,
},
attrs: []Attribute{
{
Type: 0,
Data: []byte{
0x0F, 0x0E, 0x0D, 0x0C,
0x0B, 0x0A, 0x09, 0x08,
0x07, 0x06, 0x05, 0x04,
0x03, 0x02, 0x01, 0x00,
},
},
},
msg: netlink.Message{
Header: netlink.Header{
Type: 0x067b, // IPSET | 123
Flags: 0x100, // Root
},
Data: []byte{7, 2, 0, 3, 20, 0, 0, 0, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0},
},
},
{
name: "propagate errors to caller",
attrs: []Attribute{
{
Nested: true,
NetByteOrder: true,
},
},
err: errInvalidAttributeFlags,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
msg, err := MarshalNetlink(tt.h, tt.attrs)
if err != nil {
assert.Equal(t, tt.err.Error(), err.Error())
// Don't test payload when expecting errors
return
}
assert.Equal(t, tt.msg, msg, "unexpected message")
})
}
}
func TestEncodeNetlink(t *testing.T) {
_, err := EncodeNetlink(Header{}, nil)
assert.EqualError(t, err, errNilAttributeEncoder.Error())
// Make ae.Encode() throw an error inside EncodeNetlink.
ae := NewAttributeEncoder()
ae.Do(0, func() ([]byte, error) { return []byte{}, errors.New("test error") })
_, err = EncodeNetlink(Header{}, ae)
assert.EqualError(t, err, "test error")
}