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package dhcpv4
import (
"bytes"
"fmt"
"math"
"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(OptionCode(option[0]), option[2:])
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())
// Option subnet mask
option = []byte{1, 4, 255, 255, 255, 0}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionSubnetMask, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option router
option = []byte{3, 4, 192, 168, 1, 1}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionRouter, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option domain name server
option = []byte{6, 4, 192, 168, 1, 1}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionDomainNameServer, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option host name
option = []byte{12, 4, 't', 'e', 's', 't'}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionHostName, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option domain name
option = []byte{15, 4, 't', 'e', 's', 't'}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionDomainName, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option root path
option = []byte{17, 4, '/', 'f', 'o', 'o'}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionRootPath, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option broadcast address
option = []byte{28, 4, 255, 255, 255, 255}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionBroadcastAddress, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option NTP servers
option = []byte{42, 4, 10, 10, 10, 10}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionNTPServers, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Requested IP address
option = []byte{50, 4, 1, 2, 3, 4}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
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")
// Requested IP address lease time
option = []byte{51, 4, 0, 0, 0, 0}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionIPAddressLeaseTime, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Message type
option = []byte{53, 1, 1}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
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")
// Option server ID
option = []byte{54, 4, 1, 2, 3, 4}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
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")
// Parameter request list
option = []byte{55, 3, 5, 53, 61}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
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")
// Option max message size
option = []byte{57, 2, 1, 2}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
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(OptionCode(option[0]), option[2:])
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")
// Option TFTP server name
option = []byte{66, 4, 't', 'e', 's', 't'}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionTFTPServerName, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option Bootfile name
option = []byte{67, 9, 'l', 'i', 'n', 'u', 'x', 'b', 'o', 'o', 't'}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionBootfileName, opt.Code(), "Code")
require.Equal(t, 9, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option user class information
option = []byte{77, 5, 4, 't', 'e', 's', 't'}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionUserClassInformation, opt.Code(), "Code")
require.Equal(t, 5, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option relay agent information
option = []byte{82, 6, 1, 4, 129, 168, 0, 1}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionRelayAgentInformation, opt.Code(), "Code")
require.Equal(t, 6, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
// Option client system architecture type option
option = []byte{93, 4, 't', 'e', 's', 't'}
opt, err = ParseOption(OptionCode(option[0]), option[2:])
require.NoError(t, err)
require.Equal(t, OptionClientSystemArchitectureType, opt.Code(), "Code")
require.Equal(t, 4, opt.Length(), "Length")
require.Equal(t, option, opt.ToBytes(), "ToBytes")
}
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{
&OptionGeneric{
OptionCode: 3,
Data: []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{
&OptionGeneric{
OptionCode: 3,
Data: bytes.Repeat([]byte{10}, math.MaxUint8+5),
},
},
},
{
input: []byte{
10, 2, 255, 254,
11, 3, 5, 5, 5,
byte(OptionEnd),
},
want: Options{
&OptionGeneric{
OptionCode: 10,
Data: []byte{255, 254},
},
&OptionGeneric{
OptionCode: 11,
Data: []byte{5, 5, 5},
},
},
},
{
input: append(
append([]byte{10, 2, 255, 254}, bytes.Repeat([]byte{byte(OptionPad)}, 255)...),
byte(OptionEnd),
),
want: Options{
&OptionGeneric{
OptionCode: 10,
Data: []byte{255, 254},
},
},
},
} {
t.Run(fmt.Sprintf("Test %02d", i), func(t *testing.T) {
opt, err := OptionsFromBytesWithParser(tt.input, ParseOptionGeneric, true)
if tt.wantError {
require.Error(t, err)
} else {
require.NoError(t, err)
require.Equal(t, opt, tt.want)
}
})
}
}
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