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package dhcpv4
import (
"bytes"
"testing"
)
func TestParseOption(t *testing.T) {
option := []byte{5, 4, 192, 168, 1, 254} // DNS option
opt, err := ParseOption(option)
if err != nil {
t.Fatal(err)
}
if opt.Code != OptionNameServer {
t.Fatalf("Invalid option code. Expected 5, got %v", opt.Code)
}
if !bytes.Equal(opt.Data, option[2:]) {
t.Fatalf("Invalid option data. Expected %v, got %v", option[2:], opt.Data)
}
}
func TestParseOptionPad(t *testing.T) {
option := []byte{0}
opt, err := ParseOption(option)
if err != nil {
t.Fatal(err)
}
if opt.Code != OptionPad {
t.Fatalf("Invalid option code. Expected %v, got %v", OptionPad, opt.Code)
}
if len(opt.Data) != 0 {
t.Fatalf("Invalid option data. Expected empty slice, got %v", opt.Data)
}
}
func TestParseOptionZeroLength(t *testing.T) {
option := []byte{}
_, err := ParseOption(option)
if err == nil {
t.Fatal("Expected an error, got none")
}
}
func TestParseOptionShortOption(t *testing.T) {
option := []byte{53, 1}
_, err := ParseOption(option)
if err == nil {
t.Fatal(err)
}
}
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)
if err != nil {
t.Fatal(err)
}
// each padding byte counts as an option. Magic Cookie doesn't add up
if len(opts) != 5 {
t.Fatal("Invalid options length. Expected 5, got %v", len(opts))
}
if opts[0].Code != OptionNameServer {
t.Fatal("Invalid option code. Expected %v, got %v", OptionNameServer, opts[0].Code)
}
if !bytes.Equal(opts[0].Data, options[6:10]) {
t.Fatal("Invalid option data. Expected %v, got %v", options[6:10], opts[0].Data)
}
if opts[1].Code != OptionEnd {
t.Fatalf("Invalid option code. Expected %v, got %v", OptionEnd, opts[1].Code)
}
if opts[2].Code != OptionPad {
t.Fatalf("Invalid option code. Expected %v, got %v", OptionPad, opts[2].Code)
}
}
func TestOptionsFromBytesZeroLength(t *testing.T) {
options := []byte{}
_, err := OptionsFromBytes(options)
if err == nil {
t.Fatal("Expected an error, got none")
}
}
func TestOptionsFromBytesBadMagicCookie(t *testing.T) {
options := []byte{1, 2, 3, 4}
_, err := OptionsFromBytes(options)
if err == nil {
t.Fatal("Expected an error, got none")
}
}
func TestOptionsToBytes(t *testing.T) {
originalOptions := []byte{
99, 130, 83, 99, // Magic Cookie
5, 4, 192, 168, 1, 1, // DNS
255, // end
0, 0, 0, //padding
}
options, err := OptionsFromBytes(originalOptions)
if err != nil {
t.Fatal(err)
}
finalOptions := OptionsToBytes(options)
if !bytes.Equal(originalOptions, finalOptions) {
t.Fatalf("Invalid options. Expected %v, got %v", originalOptions, finalOptions)
}
}
func TestOptionsToBytesEmpty(t *testing.T) {
originalOptions := []byte{99, 130, 83, 99}
options, err := OptionsFromBytes(originalOptions)
if err != nil {
t.Fatal(err)
}
finalOptions := OptionsToBytes(options)
if !bytes.Equal(originalOptions, finalOptions) {
t.Fatalf("Invalid options. Expected %v, got %v", originalOptions, finalOptions)
}
}
func TestOptionsToStringPad(t *testing.T) {
option := []byte{0}
opt, err := ParseOption(option)
if err != nil {
t.Fatal(err)
}
stropt := opt.String()
if stropt != "Pad -> []" {
t.Fatalf("Invalid string representation: %v", stropt)
}
}
func TestOptionsToStringDHCPMessageType(t *testing.T) {
option := []byte{53, 1, 5}
opt, err := ParseOption(option)
if err != nil {
t.Fatal(err)
}
stropt := opt.String()
if stropt != "DHCP Message Type -> [5]" {
t.Fatalf("Invalid string representation: %v", stropt)
}
}
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