Improve support for renewal and rebinding options

dhcpv4/option_duration.go

@@ -40,6 +40,16 @@ func OptIPAddressLeaseTime(d time.Duration) Option {
 	return Option{Code: OptionIPAddressLeaseTime, Value: Duration(d)}
 }
 
+// The IP address renew time option as described by RFC 2132, Section 9.11.
+func OptRenewTimeValue(d time.Duration) Option {
+	return Option{Code: OptionRenewTimeValue, Value: Duration(d)}
+}
+
+// The IP address rebinding time option as described by RFC 2132, Section 9.12.
+func OptRebindingTimeValue(d time.Duration) Option {
+	return Option{Code: OptionRebindingTimeValue, Value: Duration(d)}
+}
+
 // The IPv6-Only Preferred option is described by RFC 8925, Section 3.1
 func OptIPv6OnlyPreferred(d time.Duration) Option {
 	return Option{Code: OptionIPv6OnlyPreferred, Value: Duration(d)}

dhcpv4/option_duration_test.go

@@ -34,6 +34,60 @@ func TestGetIPAddressLeaseTime(t *testing.T) {
 	require.Equal(t, time.Duration(10), m.IPAddressLeaseTime(10))
 }
 
+func TestOptRenewTimeValue(t *testing.T) {
+	o := OptRenewTimeValue(43200 * time.Second)
+	require.Equal(t, OptionRenewTimeValue, o.Code, "Code")
+	require.Equal(t, []byte{0, 0, 168, 192}, o.Value.ToBytes(), "ToBytes")
+	require.Equal(t, "Renew Time Value: 12h0m0s", o.String(), "String")
+}
+
+func TestGetRenewTimeValue(t *testing.T) {
+	m, _ := New(WithGeneric(OptionRenewTimeValue, []byte{0, 0, 168, 192}))
+	leaseTime := m.IPAddressRenewalTime(0)
+	require.Equal(t, 43200*time.Second, leaseTime)
+
+	// Too short.
+	m, _ = New(WithGeneric(OptionRenewTimeValue, []byte{168, 192}))
+	leaseTime = m.IPAddressRenewalTime(0)
+	require.Equal(t, time.Duration(0), leaseTime)
+
+	// Too long.
+	m, _ = New(WithGeneric(OptionRenewTimeValue, []byte{1, 1, 1, 1, 1}))
+	leaseTime = m.IPAddressRenewalTime(0)
+	require.Equal(t, time.Duration(0), leaseTime)
+
+	// Empty.
+	m, _ = New()
+	require.Equal(t, time.Duration(10), m.IPAddressRenewalTime(10))
+}
+
+func TestOptRebindingTimeValue(t *testing.T) {
+	o := OptRebindingTimeValue(43200 * time.Second)
+	require.Equal(t, OptionRebindingTimeValue, o.Code, "Code")
+	require.Equal(t, []byte{0, 0, 168, 192}, o.Value.ToBytes(), "ToBytes")
+	require.Equal(t, "Rebinding Time Value: 12h0m0s", o.String(), "String")
+}
+
+func TestGetRebindingTimeValue(t *testing.T) {
+	m, _ := New(WithGeneric(OptionRebindingTimeValue, []byte{0, 0, 168, 192}))
+	leaseTime := m.IPAddressRebindingTime(0)
+	require.Equal(t, 43200*time.Second, leaseTime)
+
+	// Too short.
+	m, _ = New(WithGeneric(OptionRebindingTimeValue, []byte{168, 192}))
+	leaseTime = m.IPAddressRebindingTime(0)
+	require.Equal(t, time.Duration(0), leaseTime)
+
+	// Too long.
+	m, _ = New(WithGeneric(OptionRebindingTimeValue, []byte{1, 1, 1, 1, 1}))
+	leaseTime = m.IPAddressRebindingTime(0)
+	require.Equal(t, time.Duration(0), leaseTime)
+
+	// Empty.
+	m, _ = New()
+	require.Equal(t, time.Duration(10), m.IPAddressRebindingTime(10))
+}
+
 func TestOptIPv6OnlyPreferred(t *testing.T) {
 	o := OptIPv6OnlyPreferred(43200 * time.Second)
 	require.Equal(t, OptionIPv6OnlyPreferred, o.Code, "Code")

dhcpv4/options.go

@@ -354,7 +354,7 @@ func getOption(code OptionCode, data []byte, vendorDecoder OptionDecoder) fmt.St
 	case OptionDNSDomainSearchList:
 		d = &rfc1035label.Labels{}
 
-	case OptionIPAddressLeaseTime, OptionIPv6OnlyPreferred:
+	case OptionIPAddressLeaseTime, OptionRenewTimeValue, OptionRebindingTimeValue, OptionIPv6OnlyPreferred:
 		var dur Duration
 		d = &dur