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pytcp/protocols/dhcp4/options/dhcp4_option__message_type.py
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| #!/usr/bin/env python3 | ||
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| ################################################################################ | ||
| ## ## | ||
| ## 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 ## | ||
| ## ## | ||
| ################################################################################ | ||
|
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|
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| """ | ||
| Module contains the DHCPv4 Message Type option support code. | ||
| pytcp/protocols/dhcp4/options/dhcp4_option__message_type.py | ||
| ver 3.0.2 | ||
| """ | ||
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| from __future__ import annotations | ||
|
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| """ | ||
| import struct | ||
| from dataclasses import dataclass, field | ||
| from typing import override | ||
| from pytcp.lib.int_checks import is_uint16 | ||
| from pytcp.protocols.tcp.options.tcp_option import ( | ||
| TCP__OPTION__LEN, | ||
| TcpOption, | ||
| TcpOptionType, | ||
| ) | ||
| from pytcp.protocols.tcp.tcp__errors import TcpIntegrityError | ||
| """ | ||
|
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| # The DHCPv4 Message Type option [RFC 2132]. | ||
|
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| # +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
| # | Type = 1 | Length = 1 | Value | | ||
| # +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | ||
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| DHCP4__OPTION__MESSAGE_TYPE__LEN = 4 | ||
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| ''' | ||
| @dataclass(frozen=True, kw_only=True) | ||
| class TcpOptionMss(TcpOption): | ||
| """ | ||
| The TCP Mss (Maximum Segment Size) option support class. | ||
| """ | ||
| type: TcpOptionType = field( | ||
| repr=False, | ||
| init=False, | ||
| default=TcpOptionType.MSS, | ||
| ) | ||
| len: int = field( | ||
| repr=False, | ||
| init=False, | ||
| default=TCP__OPTION_MSS__LEN, | ||
| ) | ||
| mss: int | ||
| @override | ||
| def __post_init__(self) -> None: | ||
| """ | ||
| Validate the TCP Mss option fields. | ||
| """ | ||
| assert is_uint16(self.mss), ( | ||
| f"The 'mss' field must be a 16-bit unsigned integer. " | ||
| f"Got: {self.mss}" | ||
| ) | ||
| @override | ||
| def __str__(self) -> str: | ||
| """ | ||
| Get the TCP Mss option log string. | ||
| """ | ||
| return f"mss {self.mss}" | ||
| @override | ||
| def __bytes__(self) -> bytes: | ||
| """ | ||
| Get the TCP Mss option as bytes. | ||
| """ | ||
| return struct.pack( | ||
| "! BB H", | ||
| int(self.type), | ||
| self.len, | ||
| self.mss, | ||
| ) | ||
| @staticmethod | ||
| def _validate_integrity(_bytes: bytes, /) -> None: | ||
| """ | ||
| Validate the TCP Mss option integrity before parsing it. | ||
| """ | ||
| if (value := _bytes[1]) != TCP__OPTION_MSS__LEN: | ||
| raise TcpIntegrityError( | ||
| f"The TCP Mss option length must be {TCP__OPTION_MSS__LEN} " | ||
| f"bytes. Got: {value!r}" | ||
| ) | ||
| if (value := _bytes[1]) > len(_bytes): | ||
| raise TcpIntegrityError( | ||
| "The TCP Mss option length must be less than or equal to " | ||
| f"the length of provided bytes ({len(_bytes)}). Got: {value!r}" | ||
| ) | ||
| @override | ||
| @staticmethod | ||
| def from_bytes(_bytes: bytes, /) -> TcpOptionMss: | ||
| """ | ||
| Initialize the TCP Mss option from bytes. | ||
| """ | ||
| assert (value := len(_bytes)) >= TCP__OPTION__LEN, ( | ||
| f"The minimum length of the TCP Mss option must be " | ||
| f"{TCP__OPTION__LEN} bytes. Got: {value!r}" | ||
| ) | ||
| assert (value := _bytes[0]) == int(TcpOptionType.MSS), ( | ||
| f"The TCP Mss option type must be {TcpOptionType.MSS!r}. " | ||
| f"Got: {TcpOptionType.from_int(value)!r}" | ||
| ) | ||
| TcpOptionMss._validate_integrity(_bytes) | ||
| return TcpOptionMss(mss=int.from_bytes(_bytes[2:4])) | ||
| ''' |
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