dhcpv6: add DHCPv4-over-DHCPv6 support

Add message types, options, and modifier for handling DHCPv4-over-DHCPv6.

Refer to RFC 7341

Signed-off-by: Mikael Magnusson <mikma@users.sourceforge.net>

1 files changed, 55 insertions, 0 deletions

diff --git a/dhcpv6/option_dhcpv4_o_dhcpv6_server_test.go b/dhcpv6/option_dhcpv4_o_dhcpv6_server_test.go
new file mode 100644
index 0000000..de86594
--- /dev/null
+++ b/dhcpv6/option_dhcpv4_o_dhcpv6_server_test.go
@@ -0,0 +1,55 @@
+package dhcpv6
+
+import (
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestParseOptDHCP4oDHCP6Server(t *testing.T) {
+	data := []byte{
+		0x2a, 0x03, 0x28, 0x80, 0xff, 0xfe, 0x00, 0x0c, 0xfa, 0xce, 0xb0, 0x0c, 0x00, 0x00, 0x00, 0x35,
+	}
+	expected := []net.IP{
+		net.IP(data),
+	}
+	opt, err := ParseOptDHCP4oDHCP6Server(data)
+	require.NoError(t, err)
+	require.Equal(t, expected, opt.DHCP4oDHCP6Servers)
+	require.Equal(t, OptionDHCP4oDHCP6Server, opt.Code())
+	require.Contains(t, opt.String(), "4o6-servers=[2a03:2880:fffe:c:face:b00c:0:35]", "String() should contain the correct DHCP4-over-DHCP6 server output")
+}
+
+func TestOptDHCP4oDHCP6ServerToBytes(t *testing.T) {
+	ip1 := net.ParseIP("2a03:2880:fffe:c:face:b00c:0:35")
+	ip2 := net.ParseIP("2001:4860:4860::8888")
+	servers := []net.IP{ip1, ip2}
+	expected := append([]byte{}, []byte(ip1)...)
+	expected = append(expected, []byte(ip2)...)
+	opt := OptDHCP4oDHCP6Server{DHCP4oDHCP6Servers: servers}
+	require.Equal(t, expected, opt.ToBytes())
+}
+
+func TestParseOptDHCP4oDHCP6ServerParseNoAddr(t *testing.T) {
+	data := []byte{
+	}
+	var expected []net.IP
+	opt, err := ParseOptDHCP4oDHCP6Server(data)
+	require.NoError(t, err)
+	require.Equal(t, expected, opt.DHCP4oDHCP6Servers)
+}
+
+func TestOptDHCP4oDHCP6ServerToBytesNoAddr(t *testing.T) {
+	expected := []byte(nil)
+	opt := OptDHCP4oDHCP6Server{}
+	require.Equal(t, expected, opt.ToBytes())
+}
+
+func TestParseOptDHCP4oDHCP6ServerParseBogus(t *testing.T) {
+	data := []byte{
+		0x2a, 0x03, 0x28, 0x80, 0xff, 0xfe, 0x00, 0x0c, // invalid IPv6 address
+	}
+	_, err := ParseOptDHCP4oDHCP6Server(data)
+	require.Error(t, err, "An invalid IPv6 address should return an error")
+}