113 lines
3 KiB
Python
113 lines
3 KiB
Python
# JTFTP - Python/AsyncIO TFTP Server
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# Copyright (C) 2022 Jeffrey C. Ollie
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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class TFTPError(Exception):
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"""Base exception class for this package"""
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class WireProtocolError(TFTPError):
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"""Base exception class for wire-protocol level errors"""
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class InvalidOpcodeError(WireProtocolError):
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"""An invalid opcode was encountered"""
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opcode: int
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def __init__(self, opcode: int):
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self.opcode = opcode
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super().__init__(f"Invalid opcode: {opcode}")
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class PayloadDecodeError(WireProtocolError):
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"""Failed to parse the payload"""
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class OptionsDecodeError(PayloadDecodeError):
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"""Failed to parse options in the WRQ/RRQ datagram. It is distinct from
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L{PayloadDecodeError} so that it can be caught and dealt with gracefully
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(pretend we didn't see any options at all, perhaps).
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"""
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class InvalidErrorcodeError(PayloadDecodeError):
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"""An ERROR datagram has an error code, that does not correspond to any known
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error code values.
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@ivar errorcode: The error code, that we were unable to parse
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@type errorcode: C{int}
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"""
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error_code: int
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def __init__(self, error_code: int):
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self.error_code = error_code
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super().__init__(f"unknown error code: {error_code}")
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class BackendError(TFTPError):
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"""Base exception class for backend errors"""
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class Unsupported(BackendError):
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"""Requested operation (read/write) is not supported"""
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class AccessViolation(BackendError):
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"""Illegal filesystem operation. Corresponds to the "(2) Access violation"
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TFTP error code.
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One of the prime examples of these is an attempt at directory traversal.
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"""
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class FileNotFound(BackendError):
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"""File not found.
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Corresponds to the "(1) File not found" TFTP error code.
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@ivar file_path: Path to the file, that was requested
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@type file_path: C{bytes} or L{twisted.python.filepath.FilePath}
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"""
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def __init__(self, file_path):
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self.file_path = file_path
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def __str__(self):
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return f"File not found: {self.file_path}"
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class FileExists(BackendError):
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"""File exists.
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Corresponds to the "(6) File already exists" TFTP error code.
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@ivar file_path: Path to file
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@type file_path: C{bytes} or L{twisted.python.filepath.FilePath}
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"""
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def __init__(self, file_path):
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self.file_path = file_path
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def __str__(self):
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return f"File already exists: {self.file_path}"
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