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|
package dhcpv4
import (
"bytes"
"fmt"
"math"
"testing"
"github.com/stretchr/testify/require"
"github.com/u-root/u-root/pkg/uio"
)
func TestParseOption(t *testing.T) {
for _, tt := range []struct {
code OptionCode
value []byte
want string
}{
{
code: OptionNameServer,
value: []byte{192, 168, 1, 254},
want: "\xc0\xa8\x01\xfe ([192 168 1 254])",
},
{
code: OptionSubnetMask,
value: []byte{255, 255, 255, 0},
want: "ffffff00",
},
{
code: OptionRouter,
value: []byte{192, 168, 1, 1, 192, 168, 2, 1},
want: "192.168.1.1, 192.168.2.1",
},
{
code: OptionDomainNameServer,
value: []byte{192, 168, 1, 1, 192, 168, 2, 1},
want: "192.168.1.1, 192.168.2.1",
},
{
code: OptionNTPServers,
value: []byte{192, 168, 1, 1, 192, 168, 2, 1},
want: "192.168.1.1, 192.168.2.1",
},
{
code: OptionServerIdentifier,
value: []byte{192, 168, 1, 1, 192, 168, 2, 1},
want: "192.168.1.1, 192.168.2.1",
},
{
code: OptionHostName,
value: []byte("test"),
want: "test",
},
{
code: OptionDomainName,
value: []byte("test"),
want: "test",
},
{
code: OptionRootPath,
value: []byte("test"),
want: "test",
},
{
code: OptionClassIdentifier,
value: []byte("test"),
want: "test",
},
{
code: OptionTFTPServerName,
value: []byte("test"),
want: "test",
},
{
code: OptionBootfileName,
value: []byte("test"),
want: "test",
},
{
code: OptionBroadcastAddress,
value: []byte{192, 168, 1, 1},
want: "192.168.1.1",
},
{
code: OptionRequestedIPAddress,
value: []byte{192, 168, 1, 1},
want: "192.168.1.1",
},
{
code: OptionIPAddressLeaseTime,
value: []byte{0, 0, 0, 12},
want: "12s",
},
{
code: OptionDHCPMessageType,
value: []byte{1},
want: "DISCOVER",
},
{
code: OptionParameterRequestList,
value: []byte{3, 4, 5},
want: "Router, Time Server, Name Server",
},
{
code: OptionMaximumDHCPMessageSize,
value: []byte{1, 2},
want: "258",
},
{
code: OptionUserClassInformation,
value: []byte{4, 't', 'e', 's', 't', 3, 'f', 'o', 'o'},
want: "test, foo",
},
{
code: OptionRelayAgentInformation,
value: []byte{1, 12, 99, 105, 114, 99, 117, 105, 116, 45, 105, 100, 45, 49},
want: "\n Agent Circuit ID Sub-option: circuit-id-1 ([99 105 114 99 117 105 116 45 105 100 45 49])\n",
},
{
code: OptionClientSystemArchitectureType,
value: []byte{0, 0},
want: "Intel x86PC",
},
} {
s := parseOption(tt.code, tt.value)
if got := s.String(); got != tt.want {
t.Errorf("parseOption(%s, %v) = %s, want %s", tt.code, tt.value, got, tt.want)
}
}
}
func TestOptionToBytes(t *testing.T) {
o := Option{
Code: OptionDHCPMessageType,
Value: &OptionGeneric{[]byte{byte(MessageTypeDiscover)}},
}
serialized := o.Value.ToBytes()
expected := []byte{1}
require.Equal(t, expected, serialized)
}
func TestOptionString(t *testing.T) {
o := Option{
Code: OptionDHCPMessageType,
Value: MessageTypeDiscover,
}
require.Equal(t, "DHCP Message Type: DISCOVER", o.String())
}
func TestOptionStringUnknown(t *testing.T) {
o := Option{
Code: GenericOptionCode(102), // Returend option code.
Value: &OptionGeneric{[]byte{byte(MessageTypeDiscover)}},
}
require.Equal(t, "unknown (102): \x01 ([1])", o.String())
}
func TestOptionsMarshal(t *testing.T) {
for i, tt := range []struct {
opts Options
want []byte
}{
{
opts: nil,
want: nil,
},
{
opts: Options{
5: []byte{1, 2, 3, 4},
},
want: []byte{
5 /* key */, 4 /* length */, 1, 2, 3, 4,
},
},
{
// Test sorted key order.
opts: Options{
5: []byte{1, 2, 3},
100: []byte{101, 102, 103},
255: []byte{},
},
want: []byte{
5, 3, 1, 2, 3,
100, 3, 101, 102, 103,
},
},
{
// Test RFC 3396.
opts: Options{
5: bytes.Repeat([]byte{10}, math.MaxUint8+1),
},
want: append(append(
[]byte{5, math.MaxUint8}, bytes.Repeat([]byte{10}, math.MaxUint8)...),
5, 1, 10,
),
},
{
// Test 0-length options
opts: Options{
80: []byte{},
},
want: []byte{80, 0},
},
{
// Test special options, handled by the message marshalling code
// and ignored by the options marshalling code
opts: Options{
0: []byte{}, // Padding
255: []byte{}, // End of options
},
want: nil, // not written out
},
} {
t.Run(fmt.Sprintf("Test %02d", i), func(t *testing.T) {
require.Equal(t, tt.want, uio.ToBigEndian(tt.opts))
})
}
}
func TestOptionsUnmarshal(t *testing.T) {
for i, tt := range []struct {
input []byte
want Options
wantError bool
}{
{
// Buffer missing data.
input: []byte{
3 /* key */, 3 /* length */, 1,
},
wantError: true,
},
{
input: []byte{
// This may look too long, but 0 is padding.
// The issue here is the missing OptionEnd.
3, 3, 0, 0, 0, 0, 0, 0, 0,
},
wantError: true,
},
{
// Only OptionPad and OptionEnd can stand on their own
// without a length field. So this is too short.
input: []byte{
3,
},
wantError: true,
},
{
// Option present after the End is a nono.
input: []byte{byte(OptionEnd), 3},
wantError: true,
},
{
input: []byte{byte(OptionEnd)},
want: Options{},
},
{
input: []byte{
3, 2, 5, 6,
byte(OptionEnd),
},
want: Options{
3: []byte{5, 6},
},
},
{
// Test RFC 3396.
input: append(
append([]byte{3, math.MaxUint8}, bytes.Repeat([]byte{10}, math.MaxUint8)...),
3, 5, 10, 10, 10, 10, 10,
byte(OptionEnd),
),
want: Options{
3: bytes.Repeat([]byte{10}, math.MaxUint8+5),
},
},
{
input: []byte{
10, 2, 255, 254,
11, 3, 5, 5, 5,
byte(OptionEnd),
},
want: Options{
10: []byte{255, 254},
11: []byte{5, 5, 5},
},
},
{
input: append(
append([]byte{10, 2, 255, 254}, bytes.Repeat([]byte{byte(OptionPad)}, 255)...),
byte(OptionEnd),
),
want: Options{
10: []byte{255, 254},
},
},
} {
t.Run(fmt.Sprintf("Test %02d", i), func(t *testing.T) {
opt := make(Options)
err := opt.fromBytesCheckEnd(tt.input, true)
if tt.wantError {
require.Error(t, err)
} else {
require.NoError(t, err)
require.Equal(t, opt, tt.want)
}
})
}
}
|
