Test encoding of hello packets

protocols/ospf/packetv3/encode_test.go

+package packetv3_test
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/bio-routing/bio-rd/net"
+	ospf "github.com/bio-routing/bio-rd/protocols/ospf/packetv3"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type encodeTest struct {
+	name     string
+	msg      *ospf.OSPFv3Message
+	expected []byte
+}
+
+func runEncodeTest(t *testing.T, testCase encodeTest, src, dst net.IP) {
+	t.Run(testCase.name, func(t *testing.T) {
+		out := new(bytes.Buffer)
+		testCase.msg.Serialize(out, src, dst)
+		assert.Equal(t, testCase.expected, out.Bytes())
+	})
+}
+
+func TestEncodeHello(t *testing.T) {
+	tests := []encodeTest{
+		{
+			name: "Init",
+			msg: &ospf.OSPFv3Message{
+				Version:    3,
+				Type:       ospf.MsgTypeHello,
+				RouterID:   routerID(5, 5, 5, 5),
+				AreaID:     0,
+				InstanceID: 0,
+				Body: &ospf.Hello{
+					InterfaceID:        4,
+					RouterPriority:     200,
+					Options:            ospf.OptionsFromFlags(ospf.RouterOptR, ospf.RouterOptE, ospf.RouterOptV6),
+					HelloInterval:      20,
+					RouterDeadInterval: 60,
+				},
+			},
+			expected: []byte{
+				0x03,       // Version
+				0x01,       // Type: Hello
+				0x00, 0x24, // Length
+				0x05, 0x05, 0x05, 0x05, // Router ID
+				0x00, 0x00, 0x00, 0x00, // Area ID
+				0xd0, 0x7a, // Checksum
+				0x00, // Instance ID
+				0x00, // Reserved
+
+				// Payload
+				0x00, 0x00, 0x00, 0x04, // Interface ID
+				0xc8,       // prio
+				0x00,       // reserved
+				0x00, 0x13, // Options
+				0x00, 0x14, // Hello Interval
+				0x00, 0x3c, // Dead Interval
+				0x00, 0x00, 0x00, 0x00, // DR
+				0x00, 0x00, 0x00, 0x00, // BDR
+			},
+		},
+		{
+			name: "WithDR",
+			msg: &ospf.OSPFv3Message{
+				Version:    3,
+				Type:       ospf.MsgTypeHello,
+				RouterID:   routerID(5, 5, 5, 5),
+				AreaID:     0,
+				InstanceID: 0,
+				Body: &ospf.Hello{
+					InterfaceID:        4,
+					RouterPriority:     200,
+					Options:            ospf.OptionsFromFlags(ospf.RouterOptR, ospf.RouterOptE, ospf.RouterOptV6),
+					HelloInterval:      20,
+					RouterDeadInterval: 60,
+					DesignatedRouterID: routerID(3, 3, 3, 3),
+					Neighbors: []ospf.ID{
+						routerID(3, 3, 3, 3),
+						routerID(6, 6, 6, 6),
+					},
+				},
+			},
+			expected: []byte{
+				0x03,       // Version
+				0x01,       // Type: Hello
+				0x00, 0x2c, // Length
+				0x05, 0x05, 0x05, 0x05, // Router ID
+				0x00, 0x00, 0x00, 0x00, // Area ID
+				0xb8, 0x52, // Checksum
+				0x00, // Instance ID
+				0x00, // Reserved
+
+				// Payload
+				0x00, 0x00, 0x00, 0x04, // Interface ID
+				0xc8,       // prio
+				0x00,       // reserved
+				0x00, 0x13, // Options
+				0x00, 0x14, // Hello Interval
+				0x00, 0x3c, // Dead Interval
+				0x03, 0x03, 0x03, 0x03, // DR
+				0x00, 0x00, 0x00, 0x00, // BDR
+				// Neighbors
+				0x03, 0x03, 0x03, 0x03,
+				0x06, 0x06, 0x06, 0x06,
+			},
+		},
+		{
+			name: "WithDRSelf",
+			msg: &ospf.OSPFv3Message{
+				Version:    3,
+				Type:       ospf.MsgTypeHello,
+				RouterID:   routerID(5, 5, 5, 5),
+				AreaID:     0,
+				InstanceID: 0,
+				Body: &ospf.Hello{
+					InterfaceID:              4,
+					RouterPriority:           200,
+					Options:                  ospf.OptionsFromFlags(ospf.RouterOptR, ospf.RouterOptE, ospf.RouterOptV6),
+					HelloInterval:            20,
+					RouterDeadInterval:       60,
+					DesignatedRouterID:       routerID(5, 5, 5, 5),
+					BackupDesignatedRouterID: routerID(3, 3, 3, 3),
+					Neighbors: []ospf.ID{
+						routerID(3, 3, 3, 3),
+					},
+				},
+			},
+			expected: []byte{
+				0x03,       // Version
+				0x01,       // Type: Hello
+				0x00, 0x28, // Length
+				0x05, 0x05, 0x05, 0x05, // Router ID
+				0x00, 0x00, 0x00, 0x00, // Area ID
+				0xba, 0x5c, // Checksum
+				0x00, // Instance ID
+				0x00, // Reserved
+
+				// Payload
+				0x00, 0x00, 0x00, 0x04, // Interface ID
+				0xc8,       // prio
+				0x00,       // reserved
+				0x00, 0x13, // Options
+				0x00, 0x14, // Hello Interval
+				0x00, 0x3c, // Dead Interval
+				0x05, 0x05, 0x05, 0x05, // DR
+				0x03, 0x03, 0x03, 0x03, // BDR
+				// Neighbors
+				0x03, 0x03, 0x03, 0x03,
+			},
+		},
+	}
+
+	src, err := net.IPFromString("fe80::c92:6b3f:92b0:d49e")
+	require.NoError(t, err)
+	dst, err := net.IPFromString("fe80::acac:d4ff:fe15:fd8b")
+	require.NoError(t, err)
+
+	for _, test := range tests {
+		runEncodeTest(t, test, src, dst)
+	}
+}