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package dhcpv4
import (
"testing"
"github.com/stretchr/testify/require"
)
func TestParseOption(t *testing.T) {
// Generic
option := []byte{5, 4, 192, 168, 1, 254} // DNS option
opt, err := ParseOption(option)
require.NoError(t, err)
generic := opt.(*OptionGeneric)
require.Equal(t, OptionNameServer, generic.Code())
require.Equal(t, []byte{192, 168, 1, 254}, generic.Data)
require.Equal(t, 4, generic.Length())
require.Equal(t, "Name Server -> [192 168 1 254]", generic.String())
// Message type
option = []byte{53, 1, 1}
opt, err = ParseOption(option)
require.NoError(t, err)
require.Equal(t, OptionDHCPMessageType, opt.Code(), "Code")
require.Equal(t, 1, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Parameter request list
option = []byte{55, 3, 5, 53, 61}
opt, err = ParseOption(option)
require.NoError(t, err)
require.Equal(t, OptionParameterRequestList, opt.Code(), "Code")
require.Equal(t, 3, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Requested IP address
option = []byte{50, 4, 1, 2, 3, 4}
opt, err = ParseOption(option)
require.NoError(t, err)
require.Equal(t, OptionRequestedIPAddress, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option server ID
option = []byte{54, 4, 1, 2, 3, 4}
opt, err = ParseOption(option)
require.NoError(t, err)
require.Equal(t, OptionServerIdentifier, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option max message size
option = []byte{57, 2, 1, 2}
opt, err = ParseOption(option)
require.NoError(t, err)
require.Equal(t, OptionMaximumDHCPMessageSize, opt.Code(), "Code")
require.Equal(t, 2, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option class identifier
option = []byte{60, 4, 't', 'e', 's', 't'}
opt, err = ParseOption(option)
require.NoError(t, err)
require.Equal(t, OptionClassIdentifier, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
}
func TestParseOptionZeroLength(t *testing.T) {
option := []byte{}
_, err := ParseOption(option)
require.Error(t, err, "should get error from zero-length options")
}
func TestParseOptionShortOption(t *testing.T) {
option := []byte{53, 1}
_, err := ParseOption(option)
require.Error(t, err, "should get error from short options")
}
func TestOptionsFromBytes(t *testing.T) {
options := []byte{
99, 130, 83, 99, // Magic Cookie
5, 4, 192, 168, 1, 1, // DNS
255, // end
0, 0, 0, //padding
}
opts, err := OptionsFromBytes(options)
require.NoError(t, err)
require.Equal(t, 5, len(opts))
require.Equal(t, opts[0].(*OptionGeneric), &OptionGeneric{OptionCode: OptionNameServer, Data: []byte{192, 168, 1, 1}})
require.Equal(t, opts[1].(*OptionGeneric), &OptionGeneric{OptionCode: OptionEnd})
require.Equal(t, opts[2].(*OptionGeneric), &OptionGeneric{OptionCode: OptionPad})
require.Equal(t, opts[3].(*OptionGeneric), &OptionGeneric{OptionCode: OptionPad})
require.Equal(t, opts[4].(*OptionGeneric), &OptionGeneric{OptionCode: OptionPad})
}
func TestOptionsFromBytesZeroLength(t *testing.T) {
options := []byte{}
_, err := OptionsFromBytes(options)
require.Error(t, err)
}
func TestOptionsFromBytesBadMagicCookie(t *testing.T) {
options := []byte{1, 2, 3, 4}
_, err := OptionsFromBytes(options)
require.Error(t, err)
}
func TestOptionsFromBytesShortOption(t *testing.T) {
options := []byte{
99, 130, 83, 99, // Magic Cookie
5, 4, 192, 168, // DNS
}
_, err := OptionsFromBytes(options)
require.Error(t, err)
}
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