Added missing check.

pytcp/protocols/dhcp4/dhcp4__base.py

@@ -0,0 +1,45 @@
+#!/usr/bin/env python3
+
+################################################################################
+##                                                                            ##
+##   PyTCP - Python TCP/IP stack                                              ##
+##   Copyright (C) 2020-present Sebastian Majewski                            ##
+##                                                                            ##
+##   This program is free software: you can redistribute it and/or modify     ##
+##   it under the terms of the GNU General Public License as published by     ##
+##   the Free Software Foundation, either version 3 of the License, or        ##
+##   (at your option) any later version.                                      ##
+##                                                                            ##
+##   This program is distributed in the hope that it will be useful,          ##
+##   but WITHOUT ANY WARRANTY; without even the implied warranty of           ##
+##   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the             ##
+##   GNU General Public License for more details.                             ##
+##                                                                            ##
+##   You should have received a copy of the GNU General Public License        ##
+##   along with this program. If not, see <https://www.gnu.org/licenses/>.    ##
+##                                                                            ##
+##   Author's email: [email protected]                                      ##
+##   Github repository: https://github.com/ccie18643/PyTCP                    ##
+##                                                                            ##
+################################################################################
+
+
+"""
+This module contains the DHCPv4 protccol base class.
+
+pytcp/protocols/dhcp4/dhcp4__base.py
+
+ver 3.0.2
+"""
+
+
+from __future__ import annotations
+
+from pytcp.lib.proto import Proto
+from pytcp.protocols.dhcp4.dhcp4__header import Dhcp4HeaderProperties
+
+
+class Dhcp4(Proto, Dhcp4HeaderProperties):
+    """
+    The Ethernet protocol base class.
+    """

pytcp/protocols/dhcp4/dhcp4__enums.py

@@ -0,0 +1,58 @@
+#!/usr/bin/env python3
+
+################################################################################
+##                                                                            ##
+##   PyTCP - Python TCP/IP stack                                              ##
+##   Copyright (C) 2020-present Sebastian Majewski                            ##
+##                                                                            ##
+##   This program is free software: you can redistribute it and/or modify     ##
+##   it under the terms of the GNU General Public License as published by     ##
+##   the Free Software Foundation, either version 3 of the License, or        ##
+##   (at your option) any later version.                                      ##
+##                                                                            ##
+##   This program is distributed in the hope that it will be useful,          ##
+##   but WITHOUT ANY WARRANTY; without even the implied warranty of           ##
+##   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the             ##
+##   GNU General Public License for more details.                             ##
+##                                                                            ##
+##   You should have received a copy of the GNU General Public License        ##
+##   along with this program. If not, see <https://www.gnu.org/licenses/>.    ##
+##                                                                            ##
+##   Author's email: [email protected]                                      ##
+##   Github repository: https://github.com/ccie18643/PyTCP                    ##
+##                                                                            ##
+################################################################################
+
+
+"""
+This module contains the DHCPv4 protocol enum classes.
+
+pytcp/protocols/dhcp4/dhcp4__enums.py
+
+ver 3.0.2
+"""
+
+
+from __future__ import annotations
+
+from pytcp.lib.proto_enum import ProtoEnumWord
+
+
+class Dhcp4Operation(ProtoEnumWord):
+    """
+    The DHCPv4 header 'oper' field values.
+    """
+
+    REQUEST = 0x01
+    REPLY = 0x02
+
+
+class Dhcp4HardwareType(ProtoEnumWord):
+    """
+    The DHCPv4 header 'htype' field values.
+    """
+
+    ETHERNET = 0x01
+
+
+DHCP4__HARDWARE_LEN__ETHERNET = 6