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// Copyright 2016, Google, Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the LICENSE file in the root of the source
// tree.
package layers
import (
"bytes"
"net"
"testing"
"github.com/gopacket/gopacket"
)
func TestDHCPv4EncodeRequest(t *testing.T) {
dhcp := &DHCPv4{Operation: DHCPOpRequest, HardwareType: LinkTypeEthernet, Xid: 0x12345678,
ClientIP: net.IP{0, 0, 0, 0}, YourClientIP: net.IP{0, 0, 0, 0}, NextServerIP: net.IP{0, 0, 0, 0}, RelayAgentIP: net.IP{0, 0, 0, 0},
ClientHWAddr: net.HardwareAddr{0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc},
ServerName: make([]byte, 64), File: make([]byte, 128)}
dhcp.Options = append(dhcp.Options, NewDHCPOption(DHCPOptMessageType, []byte{byte(DHCPMsgTypeDiscover)}))
dhcp.Options = append(dhcp.Options, NewDHCPOption(DHCPOptHostname, []byte{'e', 'x', 'a', 'm', 'p', 'l', 'e', '.', 'c', 'o', 'm'}))
dhcp.Options = append(dhcp.Options, NewDHCPOption(DHCPOptPad, nil))
dhcp.Options = append(dhcp.Options, NewDHCPOption(DHCPOptParamsRequest,
[]byte{byte(DHCPOptSubnetMask), byte(DHCPOptBroadcastAddr), byte(DHCPOptTimeOffset),
byte(DHCPOptRouter), byte(DHCPOptDomainName), byte(DHCPOptDNS), byte(DHCPOptDomainSearch),
byte(DHCPOptHostname), byte(DHCPOptNetBIOSTCPNS), byte(DHCPOptInterfaceMTU), byte(DHCPOptClasslessStaticRoute),
byte(DHCPOptNTPServers)}))
buf := gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{FixLengths: true}
err := gopacket.SerializeLayers(buf, opts, dhcp)
if err != nil {
t.Fatal(err)
}
p2 := gopacket.NewPacket(buf.Bytes(), LayerTypeDHCPv4, testDecodeOptions)
dhcp2 := p2.Layer(LayerTypeDHCPv4).(*DHCPv4)
testDHCPEqual(t, dhcp, dhcp2)
}
func TestDHCPv4EncodeRequestNoOptions(t *testing.T) {
dhcp := &DHCPv4{Operation: DHCPOpRequest, HardwareType: LinkTypeEthernet, Xid: 0x12345678,
ClientIP: net.IP{0, 0, 0, 0}, YourClientIP: net.IP{0, 0, 0, 0}, NextServerIP: net.IP{0, 0, 0, 0}, RelayAgentIP: net.IP{0, 0, 0, 0},
ClientHWAddr: net.HardwareAddr{0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc},
ServerName: make([]byte, 64), File: make([]byte, 128)}
buf := gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{FixLengths: true}
err := gopacket.SerializeLayers(buf, opts, dhcp)
if err != nil {
t.Fatal(err)
}
p2 := gopacket.NewPacket(buf.Bytes(), LayerTypeDHCPv4, testDecodeOptions)
dhcp2 := p2.Layer(LayerTypeDHCPv4).(*DHCPv4)
testDHCPEqual(t, dhcp, dhcp2)
}
func TestDHCPv4EncodeResponse(t *testing.T) {
dhcp := &DHCPv4{Operation: DHCPOpReply, HardwareType: LinkTypeEthernet, Xid: 0x12345678,
ClientIP: net.IP{0, 0, 0, 0}, YourClientIP: net.IP{192, 168, 0, 123}, NextServerIP: net.IP{192, 168, 0, 1}, RelayAgentIP: net.IP{0, 0, 0, 0},
ClientHWAddr: net.HardwareAddr{0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc},
ServerName: make([]byte, 64), File: make([]byte, 128)}
dhcp.Options = append(dhcp.Options, NewDHCPOption(DHCPOptMessageType, []byte{byte(DHCPMsgTypeOffer)}))
dhcp.Options = append(dhcp.Options, NewDHCPOption(DHCPOptSubnetMask, []byte{255, 255, 255, 0}))
dhcp.Options = append(dhcp.Options, NewDHCPOption(DHCPOptPad, nil))
dhcp.Options = append(dhcp.Options, NewDHCPOption(DHCPOptT1, []byte{0x00, 0x00, 0x0e, 0x10}))
dhcp.Options = append(dhcp.Options, NewDHCPOption(DHCPOptT2, []byte{0x00, 0x00, 0x0e, 0x10}))
dhcp.Options = append(dhcp.Options, NewDHCPOption(DHCPOptLeaseTime, []byte{0x00, 0x00, 0x0e, 0x10}))
dhcp.Options = append(dhcp.Options, NewDHCPOption(DHCPOptServerID, []byte{192, 168, 0, 1}))
buf := gopacket.NewSerializeBuffer()
opts := gopacket.SerializeOptions{FixLengths: true}
err := gopacket.SerializeLayers(buf, opts, dhcp)
if err != nil {
t.Fatal(err)
}
p2 := gopacket.NewPacket(buf.Bytes(), LayerTypeDHCPv4, testDecodeOptions)
dhcp2 := p2.Layer(LayerTypeDHCPv4).(*DHCPv4)
testDHCPEqual(t, dhcp, dhcp2)
}
func TestDHCPv4DecodeOption(t *testing.T) {
var tests = []struct {
msg string
buf []byte
err error
}{
{
msg: "DHCPOptPad",
buf: []byte{0},
err: nil,
},
{
msg: "Option with zero length",
buf: []byte{119, 0},
err: nil,
},
{
msg: "Option with maximum length",
buf: bytes.Join([][]byte{
{119, 255},
bytes.Repeat([]byte{0}, 255),
}, nil),
err: nil,
},
{
msg: "Too short option",
buf: []byte{},
err: DecOptionNotEnoughData,
},
{
msg: "Too short option when option is not 0 or 255",
buf: []byte{119},
err: DecOptionNotEnoughData,
},
{
msg: "Malformed option",
buf: []byte{119, 1},
err: DecOptionMalformed,
},
}
for i := range tests {
var (
opt = new(DHCPOption)
err = opt.decode(tests[i].buf)
)
if want, got := tests[i].err, err; want != got {
t.Errorf("[#%v %v] Unexpected error want: %v, got: %v\n", i, tests[i].msg, want, err)
}
}
}
func testDHCPEqual(t *testing.T, d1, d2 *DHCPv4) {
if d1.Operation != d2.Operation {
t.Errorf("expected Operation=%s, got %s", d1.Operation, d2.Operation)
}
if d1.HardwareType != d2.HardwareType {
t.Errorf("expected HardwareType=%s, got %s", d1.HardwareType, d2.HardwareType)
}
if d1.HardwareLen != d2.HardwareLen {
t.Errorf("expected HardwareLen=%v, got %v", d1.HardwareLen, d2.HardwareLen)
}
if d1.RelayHops != d2.RelayHops {
t.Errorf("expected RelayHops=%v, got %v", d1.RelayHops, d2.RelayHops)
}
if d1.Xid != d2.Xid {
t.Errorf("expected Xid=%v, got %v", d1.Xid, d2.Xid)
}
if d1.Secs != d2.Secs {
t.Errorf("expected Secs=%v, got %v", d1.Secs, d2.Secs)
}
if d1.Flags != d2.Flags {
t.Errorf("expected Flags=%v, got %v", d1.Flags, d2.Flags)
}
if !d1.ClientIP.Equal(d2.ClientIP) {
t.Errorf("expected ClientIP=%v, got %v", d1.ClientIP, d2.ClientIP)
}
if !d1.YourClientIP.Equal(d2.YourClientIP) {
t.Errorf("expected YourClientIP=%v, got %v", d1.YourClientIP, d2.YourClientIP)
}
if !d1.NextServerIP.Equal(d2.NextServerIP) {
t.Errorf("expected NextServerIP=%v, got %v", d1.NextServerIP, d2.NextServerIP)
}
if !d1.RelayAgentIP.Equal(d2.RelayAgentIP) {
t.Errorf("expected RelayAgentIP=%v, got %v", d1.RelayAgentIP, d2.RelayAgentIP)
}
if !bytes.Equal(d1.ClientHWAddr, d2.ClientHWAddr) {
t.Errorf("expected ClientHWAddr=%v, got %v", d1.ClientHWAddr, d2.ClientHWAddr)
}
if !bytes.Equal(d1.ServerName, d2.ServerName) {
t.Errorf("expected ServerName=%v, got %v", d1.ServerName, d2.ServerName)
}
if !bytes.Equal(d1.File, d2.File) {
t.Errorf("expected File=%v, got %v", d1.File, d2.File)
}
if len(d1.Options) != len(d2.Options) {
t.Errorf("expected %d options, got %d", len(d1.Options), len(d2.Options))
}
for i, o := range d1.Options {
testDHCPOptionEqual(t, i, o, d2.Options[i])
}
}
func testDHCPOptionEqual(t *testing.T, idx int, d1, d2 DHCPOption) {
if d1.Type != d2.Type {
t.Errorf("expection Options[%d].Type = %s, got %s", idx, d1.Type, d2.Type)
}
if !bytes.Equal(d1.Data, d2.Data) {
t.Errorf("expection Options[%d].Data to be = %v, got %v", idx, d1.Data, d2.Data)
}
}
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