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package dhcpv4
import (
"bytes"
"github.com/insomniacslk/dhcp/iana"
"net"
"testing"
)
// NOTE: if one of the following Assert* fails where expected and got values are
// the same, you probably have to cast one of them to match the other one's
// type, e.g. comparing int and byte, even the same value, will fail.
func AssertEqual(t *testing.T, a, b interface{}, what string) {
if a != b {
t.Fatalf("Invalid %s. %v != %v", what, a, b)
}
}
func AssertEqualBytes(t *testing.T, a, b []byte, what string) {
if !bytes.Equal(a, b) {
t.Fatalf("Invalid %s. %v != %v", what, a, b)
}
}
func AssertEqualIPAddr(t *testing.T, a, b net.IP, what string) {
if !net.IP.Equal(a, b) {
t.Fatalf("Invalid %s. %v != %v", what, a, b)
}
}
func TestFromBytes(t *testing.T) {
data := []byte{
1, // dhcp request
1, // ethernet hw type
6, // hw addr length
3, // hop count
0xaa, 0xbb, 0xcc, 0xdd, // transaction ID, big endian (network)
0, 3, // number of seconds
0, 1, // broadcast
0, 0, 0, 0, // client IP address
0, 0, 0, 0, // your IP address
0, 0, 0, 0, // server IP address
0, 0, 0, 0, // gateway IP address
0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // client MAC address + padding
}
// server host name
expectedHostname := []byte{}
for i := 0; i < 64; i++ {
expectedHostname = append(expectedHostname, 0)
}
data = append(data, expectedHostname...)
// boot file name
expectedBootfilename := []byte{}
for i := 0; i < 128; i++ {
expectedBootfilename = append(expectedBootfilename, 0)
}
data = append(data, expectedBootfilename...)
// magic cookie, then no options
data = append(data, []byte{99, 130, 83, 99}...)
d, err := FromBytes(data)
if err != nil {
t.Fatal(err)
}
AssertEqual(t, d.Opcode(), OpcodeBootRequest, "opcode")
AssertEqual(t, d.HwType(), iana.HwTypeEthernet, "hardware type")
AssertEqual(t, d.HwAddrLen(), byte(6), "hardware address length")
AssertEqual(t, d.HopCount(), byte(3), "hop count")
AssertEqual(t, d.TransactionID(), uint32(0xaabbccdd), "transaction ID")
AssertEqual(t, d.NumSeconds(), uint16(3), "number of seconds")
AssertEqual(t, d.Flags(), uint16(1), "flags")
AssertEqualIPAddr(t, d.ClientIPAddr(), net.IPv4zero, "client IP address")
AssertEqualIPAddr(t, d.YourIPAddr(), net.IPv4zero, "your IP address")
AssertEqualIPAddr(t, d.ServerIPAddr(), net.IPv4zero, "server IP address")
AssertEqualIPAddr(t, d.GatewayIPAddr(), net.IPv4zero, "gateway IP address")
hwaddr := d.ClientHwAddr()
AssertEqualBytes(t, hwaddr[:], []byte{0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, "flags")
hostname := d.ServerHostName()
AssertEqualBytes(t, hostname[:], expectedHostname, "server host name")
bootfilename := d.BootFileName()
AssertEqualBytes(t, bootfilename[:], expectedBootfilename, "boot file name")
// no need to check Magic Cookie as it is already validated in FromBytes
// above
}
func TestFromBytesZeroLength(t *testing.T) {
data := []byte{}
_, err := FromBytes(data)
if err == nil {
t.Fatal("Expected error, got nil")
}
}
func TestFromBytesShortLength(t *testing.T) {
data := []byte{1, 1, 6, 0}
_, err := FromBytes(data)
if err == nil {
t.Fatal("Expected error, got nil")
}
}
func TestFromBytesInvalidOptions(t *testing.T) {
data := []byte{
1, // dhcp request
1, // ethernet hw type
6, // hw addr length
0, // hop count
0xaa, 0xbb, 0xcc, 0xdd, // transaction ID
3, 0, // number of seconds
1, 0, // broadcast
0, 0, 0, 0, // client IP address
0, 0, 0, 0, // your IP address
0, 0, 0, 0, // server IP address
0, 0, 0, 0, // gateway IP address
0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // client MAC address + padding
}
// server host name
for i := 0; i < 64; i++ {
data = append(data, 0)
}
// boot file name
for i := 0; i < 128; i++ {
data = append(data, 0)
}
// invalid magic cookie, forcing option parsing to fail
data = append(data, []byte{99, 130, 83, 98}...)
_, err := FromBytes(data)
if err == nil {
t.Fatal("Expected error, got nil")
}
}
func TestSettersAndGetters(t *testing.T) {
data := []byte{
1, // dhcp request
1, // ethernet hw type
6, // hw addr length
3, // hop count
0xaa, 0xbb, 0xcc, 0xdd, // transaction ID, big endian (network)
0, 3, // number of seconds
0, 1, // broadcast
1, 2, 3, 4, // client IP address
5, 6, 7, 8, // your IP address
9, 10, 11, 12, // server IP address
13, 14, 15, 16, // gateway IP address
0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // client MAC address + padding
}
// server host name
expectedHostname := []byte{}
for i := 0; i < 64; i++ {
expectedHostname = append(expectedHostname, 0)
}
data = append(data, expectedHostname...)
// boot file name
expectedBootfilename := []byte{}
for i := 0; i < 128; i++ {
expectedBootfilename = append(expectedBootfilename, 0)
}
data = append(data, expectedBootfilename...)
// magic cookie, then no options
data = append(data, []byte{99, 130, 83, 99}...)
d, err := FromBytes(data)
if err != nil {
t.Fatal(err)
}
// getter/setter for Opcode
AssertEqual(t, d.Opcode(), OpcodeBootRequest, "opcode")
d.SetOpcode(OpcodeBootReply)
AssertEqual(t, d.Opcode(), OpcodeBootReply, "opcode")
// getter/setter for HwType
AssertEqual(t, d.HwType(), iana.HwTypeEthernet, "hardware type")
d.SetHwType(iana.HwTypeARCNET)
AssertEqual(t, d.HwType(), iana.HwTypeARCNET, "hardware type")
// getter/setter for HwAddrLen
AssertEqual(t, d.HwAddrLen(), uint8(6), "hardware address length")
d.SetHwAddrLen(12)
AssertEqual(t, d.HwAddrLen(), uint8(12), "hardware address length")
// getter/setter for HopCount
AssertEqual(t, d.HopCount(), uint8(3), "hop count")
d.SetHopCount(1)
AssertEqual(t, d.HopCount(), uint8(1), "hop count")
// getter/setter for TransactionID
AssertEqual(t, d.TransactionID(), uint32(0xaabbccdd), "transaction ID")
d.SetTransactionID(0xeeff0011)
AssertEqual(t, d.TransactionID(), uint32(0xeeff0011), "transaction ID")
// getter/setter for TransactionID
AssertEqual(t, d.NumSeconds(), uint16(3), "number of seconds")
d.SetNumSeconds(15)
AssertEqual(t, d.NumSeconds(), uint16(15), "number of seconds")
// getter/setter for Flags
AssertEqual(t, d.Flags(), uint16(1), "flags")
d.SetFlags(0)
AssertEqual(t, d.Flags(), uint16(0), "flags")
// getter/setter for ClientIPAddr
AssertEqualIPAddr(t, d.ClientIPAddr(), net.IPv4(1, 2, 3, 4), "client IP address")
d.SetClientIPAddr(net.IPv4(4, 3, 2, 1))
AssertEqualIPAddr(t, d.ClientIPAddr(), net.IPv4(4, 3, 2, 1), "client IP address")
// getter/setter for YourIPAddr
AssertEqualIPAddr(t, d.YourIPAddr(), net.IPv4(5, 6, 7, 8), "your IP address")
d.SetYourIPAddr(net.IPv4(8, 7, 6, 5))
AssertEqualIPAddr(t, d.YourIPAddr(), net.IPv4(8, 7, 6, 5), "your IP address")
// getter/setter for ServerIPAddr
AssertEqualIPAddr(t, d.ServerIPAddr(), net.IPv4(9, 10, 11, 12), "server IP address")
d.SetServerIPAddr(net.IPv4(12, 11, 10, 9))
AssertEqualIPAddr(t, d.ServerIPAddr(), net.IPv4(12, 11, 10, 9), "server IP address")
// getter/setter for GatewayIPAddr
AssertEqualIPAddr(t, d.GatewayIPAddr(), net.IPv4(13, 14, 15, 16), "gateway IP address")
d.SetGatewayIPAddr(net.IPv4(16, 15, 14, 13))
AssertEqualIPAddr(t, d.GatewayIPAddr(), net.IPv4(16, 15, 14, 13), "gateway IP address")
// getter/setter for ClientHwAddr
hwaddr := d.ClientHwAddr()
AssertEqualBytes(t, hwaddr[:], []byte{0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, "client hardware address")
d.SetFlags(0)
// getter/setter for ServerHostName
serverhostname := d.ServerHostName()
AssertEqualBytes(t, serverhostname[:], expectedHostname, "server host name")
newHostname := []byte{'t', 'e', 's', 't'}
for i := 0; i < 60; i++ {
newHostname = append(newHostname, 0)
}
d.SetServerHostName(newHostname)
serverhostname = d.ServerHostName()
AssertEqualBytes(t, serverhostname[:], newHostname, "server host name")
// getter/setter for BootFileName
bootfilename := d.BootFileName()
AssertEqualBytes(t, bootfilename[:], expectedBootfilename, "boot file name")
newBootfilename := []byte{'t', 'e', 's', 't'}
for i := 0; i < 124; i++ {
newBootfilename = append(newBootfilename, 0)
}
d.SetBootFileName(newBootfilename)
bootfilename = d.BootFileName()
AssertEqualBytes(t, bootfilename[:], newBootfilename, "boot file name")
}
func TestToStringMethods(t *testing.T) {
d, err := New()
if err != nil {
t.Fatal(err)
}
// OpcodeToString
d.SetOpcode(OpcodeBootRequest)
AssertEqual(t, d.OpcodeToString(), "BootRequest", "OpcodeToString")
d.SetOpcode(OpcodeBootReply)
AssertEqual(t, d.OpcodeToString(), "BootReply", "OpcodeToString")
d.SetOpcode(OpcodeType(0))
AssertEqual(t, d.OpcodeToString(), "Invalid", "OpcodeToString")
// HwTypeToString
d.SetHwType(iana.HwTypeEthernet)
AssertEqual(t, d.HwTypeToString(), "Ethernet", "HwTypeToString")
d.SetHwType(iana.HwTypeARCNET)
AssertEqual(t, d.HwTypeToString(), "ARCNET", "HwTypeToString")
// FlagsToString
d.SetUnicast()
AssertEqual(t, d.FlagsToString(), "Unicast", "FlagsToString")
d.SetBroadcast()
AssertEqual(t, d.FlagsToString(), "Broadcast", "FlagsToString")
d.SetFlags(0xffff)
AssertEqual(t, d.FlagsToString(), "Broadcast (reserved bits not zeroed)", "FlagsToString")
// ClientHwAddrToString
d.SetHwAddrLen(6)
d.SetClientHwAddr([]byte{0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0})
AssertEqual(t, d.ClientHwAddrToString(), "aa:bb:cc:dd:ee:ff", "ClientHwAddrToString")
// ServerHostNameToString
d.SetServerHostName([]byte("my.host.local"))
AssertEqual(t, d.ServerHostNameToString(), "my.host.local", "ServerHostNameToString")
// BootFileNameToString
d.SetBootFileName([]byte("/my/boot/file"))
AssertEqual(t, d.BootFileNameToString(), "/my/boot/file", "BootFileNameToString")
}
func TestToBytes(t *testing.T) {
// the following bytes match what dhcpv4.New would create. Keep them in
// sync!
expected := []byte{
1, // Opcode BootRequest
1, // HwType Ethernet
6, // HwAddrLen
0, // HopCount
0x11, 0x22, 0x33, 0x44, // TransactionID
0, 0, // NumSeconds
0, 0, // Flags
0, 0, 0, 0, // ClientIPAddr
0, 0, 0, 0, // YourIPAddr
0, 0, 0, 0, // ServerIPAddr
0, 0, 0, 0, // GatewayIPAddr
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // ClientHwAddr
}
// ServerHostName
for i := 0; i < 64; i++ {
expected = append(expected, 0)
}
// BootFileName
for i := 0; i < 128; i++ {
expected = append(expected, 0)
}
// Magic Cookie
expected = append(expected, MagicCookie...)
d, err := New()
if err != nil {
t.Fatal(err)
}
// fix TransactionID to match the expected one, since it's randomly
// generated in New()
d.SetTransactionID(0x11223344)
got := d.ToBytes()
AssertEqualBytes(t, expected, got, "ToBytes")
}
// TODO
// test broadcast/unicast flags
// test Options setter/getter
// test Summary() and String()
|
