Add more specific dhcpv4 options (#17)

Added several DHCPv4 options

1 files changed, 44 insertions, 0 deletions

diff --git a/dhcpv4/option_requested_ip_address_test.go b/dhcpv4/option_requested_ip_address_test.go
new file mode 100644
index 0000000..2951ebb
--- /dev/null
+++ b/dhcpv4/option_requested_ip_address_test.go
@@ -0,0 +1,44 @@
+package dhcpv4
+
+import (
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestOptServerIdentifierInterfaceMethods(t *testing.T) {
+	ip := net.IP{192, 168, 0, 1}
+	o := OptServerIdentifier{ServerID: ip}
+
+	require.Equal(t, OptionServerIdentifier, o.Code(), "Code")
+
+	expectedBytes := []byte{54, 4, 192, 168, 0, 1}
+	require.Equal(t, expectedBytes, o.ToBytes(), "ToBytes")
+
+	require.Equal(t, 4, o.Length(), "Length")
+
+	require.Equal(t, "Server Identifier -> 192.168.0.1", o.String(), "String")
+}
+
+func TestParseOptServerIdentifier(t *testing.T) {
+	var (
+		o   *OptServerIdentifier
+		err error
+	)
+	o, err = ParseOptServerIdentifier([]byte{})
+	require.Error(t, err, "empty byte stream")
+
+	o, err = ParseOptServerIdentifier([]byte{54, 4, 192})
+	require.Error(t, err, "short byte stream")
+
+	o, err = ParseOptServerIdentifier([]byte{54, 3, 192, 168, 0, 1})
+	require.Error(t, err, "wrong IP length")
+
+	o, err = ParseOptServerIdentifier([]byte{53, 4, 192, 168, 1})
+	require.Error(t, err, "wrong option code")
+
+	o, err = ParseOptServerIdentifier([]byte{54, 4, 192, 168, 0, 1})
+	require.NoError(t, err)
+	require.Equal(t, net.IP{192, 168, 0, 1}, o.ServerID)
+}