add OptNTPServers (#115)

1 files changed, 65 insertions, 0 deletions

diff --git a/dhcpv4/option_ntp_servers_test.go b/dhcpv4/option_ntp_servers_test.go
new file mode 100644
index 0000000..e7bcefd
--- /dev/null
+++ b/dhcpv4/option_ntp_servers_test.go
@@ -0,0 +1,65 @@
+package dhcpv4
+
+import (
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestOptNTPServersInterfaceMethods(t *testing.T) {
+	ntpServers := []net.IP{
+		net.IPv4(192, 168, 0, 10),
+		net.IPv4(192, 168, 0, 20),
+	}
+	o := OptNTPServers{NTPServers: ntpServers}
+	require.Equal(t, OptionNTPServers, o.Code(), "Code")
+	require.Equal(t, net.IPv4len*len(ntpServers), o.Length(), "Length")
+	require.Equal(t, ntpServers, o.NTPServers, "NTPServers")
+}
+
+func TestParseOptNTPServers(t *testing.T) {
+	data := []byte{
+		byte(OptionNTPServers),
+		8,               // Length
+		192, 168, 0, 10, // NTP server #1
+		192, 168, 0, 20, // NTP server #2
+	}
+	o, err := ParseOptNTPServers(data)
+	require.NoError(t, err)
+	ntpServers := []net.IP{
+		net.IPv4(192, 168, 0, 10),
+		net.IPv4(192, 168, 0, 20),
+	}
+	require.Equal(t, &OptNTPServers{NTPServers: ntpServers}, o)
+
+	// Short byte stream
+	data = []byte{byte(OptionNTPServers)}
+	_, err = ParseOptNTPServers(data)
+	require.Error(t, err, "should get error from short byte stream")
+
+	// Wrong code
+	data = []byte{54, 2, 1, 1}
+	_, err = ParseOptNTPServers(data)
+	require.Error(t, err, "should get error from wrong code")
+
+	// Bad length
+	data = []byte{byte(OptionNTPServers), 6, 1, 1, 1}
+	_, err = ParseOptNTPServers(data)
+	require.Error(t, err, "should get error from bad length")
+}
+
+func TestParseOptNTPserversNoNTPServers(t *testing.T) {
+	// RFC2132 requires that at least one NTP server IP is specified
+	data := []byte{
+		byte(OptionNTPServers),
+		0, // Length
+	}
+	_, err := ParseOptNTPServers(data)
+	require.Error(t, err)
+}
+
+func TestOptNTPServersString(t *testing.T) {
+	o := OptNTPServers{NTPServers: []net.IP{net.IPv4(192, 168, 0, 1), net.IPv4(192, 168, 0, 10)}}
+	require.Equal(t, "NTP Servers -> 192.168.0.1, 192.168.0.10", o.String())
+}