def Redirected_Header(class_object, original_packet):
option_data = struct.pack('>BBBBBB', 0x00, 0x00, 0x00, 0x00, 0x00,
0x00) # Reserved bytes
option_data += ImpactPacket.array_tobytes(
array.array("B", original_packet))
option_length = (len(option_data) + 4) / 8
return class_object.__build_option(NDP_Option.REDIRECTED_HEADER,
option_length, option_data)
def Neighbor_Advertisement(class_object, router_flag, solicited_flag, override_flag, target_address):
flag_byte = 0x00
if (router_flag):
flag_byte |= 0x80
if (solicited_flag):
flag_byte |= 0x40
if (override_flag):
flag_byte |= 0x20
message_data = struct.pack('>BBBB', flag_byte, 0x00, 0x00, 0x00) #Flag byte and three reserved bytes
message_data += ImpactPacket.array_tobytes(target_address.as_bytes())
return class_object.__build_message(NDP.NEIGHBOR_ADVERTISEMENT, message_data)
def Prefix_Information(class_object, prefix_length, on_link_flag, autonomous_flag, valid_lifetime, preferred_lifetime, prefix):
flag_byte = 0x00
if (on_link_flag):
flag_byte |= 0x80
if (autonomous_flag):
flag_byte |= 0x40
option_data = struct.pack('>BBLL', prefix_length, flag_byte, valid_lifetime, preferred_lifetime)
option_data += struct.pack('>L', 0) #Reserved bytes
option_data += ImpactPacket.array_tobytes(array.array("B", prefix))
option_length = 4
return class_object.__build_option(NDP_Option.PREFIX_INFORMATION, option_length, option_data)
def getter(self, o):
b = ip.array_tobytes(o.header.get_bytes()[self.index:self.index + 3])
#unpack requires a string argument of length 4 and b is 3 bytes long
(value, ) = struct.unpack('!L', b'\x00' + b)
return value
def Redirect(class_object, target_address, destination_address):
message_data = struct.pack('>L', 0)# Reserved bytes
message_data += ImpactPacket.array_tobytes(target_address.as_bytes())
message_data += ImpactPacket.array_tobytes(destination_address.as_bytes())
return class_object.__build_message(NDP.REDIRECT, message_data)
def Neighbor_Solicitation(class_object, target_address):
message_data = struct.pack('>L', 0) #Reserved bytes
message_data += ImpactPacket.array_tobytes(target_address.as_bytes())
return class_object.__build_message(NDP.NEIGHBOR_SOLICITATION, message_data)
def __Link_Layer_Address(class_object, option_type, link_layer_address):
option_length = (len(link_layer_address) / 8) + 1
option_data = ImpactPacket.array_tobytes(array.array("B", link_layer_address))
return class_object.__build_option(option_type, option_length, option_data)