735 lines
27 KiB
Python
Executable file
735 lines
27 KiB
Python
Executable file
#!/usr/bin/env python3
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#
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# Copyright The Mbed TLS Contributors
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# SPDX-License-Identifier: Apache-2.0
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""
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This script confirms that the naming of all symbols and identifiers in Mbed TLS
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are consistent with the house style and are also self-consistent. It only runs
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on Linux and macOS since it depends on nm.
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The script performs the following checks:
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- All exported and available symbols in the library object files, are explicitly
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declared in the header files. This uses the nm command.
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- All macros, constants, and identifiers (function names, struct names, etc)
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follow the required pattern.
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- Typo checking: All words that begin with MBED exist as macros or constants.
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"""
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import argparse
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import textwrap
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import os
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import sys
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import traceback
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import re
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import shutil
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import subprocess
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import logging
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# Naming patterns to check against. These are defined outside the NameCheck
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# class for ease of modification.
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MACRO_PATTERN = r"^(MBEDTLS|PSA)_[0-9A-Z_]*[0-9A-Z]$"
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CONSTANTS_PATTERN = MACRO_PATTERN
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IDENTIFIER_PATTERN = r"^(mbedtls|psa)_[0-9a-z_]*[0-9a-z]$"
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class Match(): # pylint: disable=too-few-public-methods
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"""
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A class representing a match, together with its found position.
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Fields:
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* filename: the file that the match was in.
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* line: the full line containing the match.
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* pos: a tuple of (line_no, start, end) positions on the file line where the
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match is.
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* name: the match itself.
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"""
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def __init__(self, filename, line, pos, name):
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self.filename = filename
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self.line = line
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self.pos = pos
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self.name = name
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def __str__(self):
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ln_str = str(self.pos[0])
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gutter_len = max(4, len(ln_str))
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gutter = (gutter_len - len(ln_str)) * " " + ln_str
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underline = self.pos[1] * " " + (self.pos[2] - self.pos[1]) * "^"
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return (
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" {0} |\n".format(gutter_len * " ") +
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" {0} | {1}".format(gutter, self.line) +
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" {0} | {1}".format(gutter_len * " ", underline)
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)
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class Problem(): # pylint: disable=too-few-public-methods
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"""
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A parent class representing a form of static analysis error.
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Fields:
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* textwrapper: a TextWrapper instance to format problems nicely.
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"""
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def __init__(self):
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self.textwrapper = textwrap.TextWrapper()
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self.textwrapper.width = 80
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self.textwrapper.initial_indent = " > "
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self.textwrapper.subsequent_indent = " "
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class SymbolNotInHeader(Problem): # pylint: disable=too-few-public-methods
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"""
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A problem that occurs when an exported/available symbol in the object file
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is not explicitly declared in header files. Created with
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NameCheck.check_symbols_declared_in_header()
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Fields:
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* symbol_name: the name of the symbol.
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"""
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def __init__(self, symbol_name):
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self.symbol_name = symbol_name
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Problem.__init__(self)
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def __str__(self):
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return self.textwrapper.fill(
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"'{0}' was found as an available symbol in the output of nm, "
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"however it was not declared in any header files."
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.format(self.symbol_name))
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class PatternMismatch(Problem): # pylint: disable=too-few-public-methods
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"""
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A problem that occurs when something doesn't match the expected pattern.
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Created with NameCheck.check_match_pattern()
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Fields:
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* pattern: the expected regex pattern
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* match: the Match object in question
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"""
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def __init__(self, pattern, match):
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self.pattern = pattern
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self.match = match
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Problem.__init__(self)
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def __str__(self):
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return self.textwrapper.fill(
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"{0}:{1}: '{2}' does not match the required pattern '{3}'."
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.format(
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self.match.filename,
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self.match.pos[0],
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self.match.name,
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self.pattern)) + "\n" + str(self.match)
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class Typo(Problem): # pylint: disable=too-few-public-methods
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"""
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A problem that occurs when a word using MBED doesn't appear to be defined as
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constants nor enum values. Created with NameCheck.check_for_typos()
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Fields:
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* match: the Match object of the MBED name in question.
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"""
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def __init__(self, match):
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self.match = match
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Problem.__init__(self)
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def __str__(self):
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return self.textwrapper.fill(
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"{0}:{1}: '{2}' looks like a typo. It was not found in any "
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"macros or any enums. If this is not a typo, put "
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"//no-check-names after it."
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.format(
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self.match.filename,
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self.match.pos[0],
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self.match.name)) + "\n" + str(self.match)
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class NameCheck():
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"""
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Representation of the core name checking operation performed by this script.
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Shares a common logger, common excluded filenames, and a shared return_code.
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"""
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def __init__(self):
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self.log = None
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self.return_code = 0
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self.excluded_files = ["bn_mul", "compat-2.x.h"]
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self.parse_result = {}
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def set_return_code(self, return_code):
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if return_code > self.return_code:
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self.log.debug("Setting new return code to {}".format(return_code))
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self.return_code = return_code
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def setup_logger(self, verbose=False):
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"""
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Set up a logger and set the change the default logging level from
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WARNING to INFO. Loggers are better than print statements since their
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verbosity can be controlled.
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"""
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self.log = logging.getLogger()
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if verbose:
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self.log.setLevel(logging.DEBUG)
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else:
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self.log.setLevel(logging.INFO)
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self.log.addHandler(logging.StreamHandler())
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def get_files(self, extension, directory):
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"""
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Get all files that end with .extension in the specified directory
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recursively.
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Args:
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* extension: the file extension to search for, without the dot
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* directory: the directory to recursively search for
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Returns a List of relative filepaths.
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"""
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filenames = []
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for root, _, files in sorted(os.walk(directory)):
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for filename in sorted(files):
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if (filename not in self.excluded_files and
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filename.endswith("." + extension)):
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filenames.append(os.path.join(root, filename))
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return filenames
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def parse_names_in_source(self):
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"""
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Calls each parsing function to retrieve various elements of the code,
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together with their source location. Puts the parsed values in the
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internal variable self.parse_result.
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"""
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self.log.info("Parsing source code...")
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self.log.debug(
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"The following files are excluded from the search: {}"
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.format(str(self.excluded_files))
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)
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m_headers = self.get_files("h", os.path.join("include", "mbedtls"))
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p_headers = self.get_files("h", os.path.join("include", "psa"))
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t_headers = ["3rdparty/everest/include/everest/everest.h",
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"3rdparty/everest/include/everest/x25519.h"]
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d_headers = self.get_files("h", os.path.join("tests", "include", "test", "drivers"))
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l_headers = self.get_files("h", "library")
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libraries = self.get_files("c", "library") + [
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"3rdparty/everest/library/everest.c",
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"3rdparty/everest/library/x25519.c"]
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all_macros = self.parse_macros(
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m_headers + p_headers + t_headers + l_headers + d_headers)
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enum_consts = self.parse_enum_consts(
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m_headers + l_headers + t_headers)
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identifiers = self.parse_identifiers(
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m_headers + p_headers + t_headers + l_headers)
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mbed_words = self.parse_mbed_words(
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m_headers + p_headers + t_headers + l_headers + libraries)
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symbols = self.parse_symbols()
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# Remove identifier macros like mbedtls_printf or mbedtls_calloc
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identifiers_justname = [x.name for x in identifiers]
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actual_macros = []
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for macro in all_macros:
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if macro.name not in identifiers_justname:
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actual_macros.append(macro)
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self.log.debug("Found:")
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self.log.debug(" {} Macros".format(len(all_macros)))
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self.log.debug(" {} Non-identifier Macros".format(len(actual_macros)))
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self.log.debug(" {} Enum Constants".format(len(enum_consts)))
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self.log.debug(" {} Identifiers".format(len(identifiers)))
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self.log.debug(" {} Exported Symbols".format(len(symbols)))
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self.log.info("Analysing...")
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self.parse_result = {
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"macros": actual_macros,
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"enum_consts": enum_consts,
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"identifiers": identifiers,
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"symbols": symbols,
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"mbed_words": mbed_words
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}
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def parse_macros(self, header_files):
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"""
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Parse all macros defined by #define preprocessor directives.
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Args:
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* header_files: A List of filepaths to look through.
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Returns a List of Match objects for the found macros.
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"""
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macro_regex = re.compile(r"# *define +(?P<macro>\w+)")
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exclusions = (
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"asm", "inline", "EMIT", "_CRT_SECURE_NO_DEPRECATE", "MULADDC_"
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)
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self.log.debug("Looking for macros in {} files".format(len(header_files)))
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macros = []
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for header_file in header_files:
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with open(header_file, "r", encoding="utf-8") as header:
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for line_no, line in enumerate(header):
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for macro in macro_regex.finditer(line):
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if not macro.group("macro").startswith(exclusions):
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macros.append(Match(
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header_file,
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line,
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(line_no, macro.start(), macro.end()),
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macro.group("macro")))
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return macros
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def parse_mbed_words(self, files):
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"""
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Parse all words in the file that begin with MBED. Includes macros.
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There have been typos of TLS, hence the broader check than MBEDTLS.
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Args:
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* files: a List of filepaths to look through.
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Returns a List of Match objects for words beginning with MBED.
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"""
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mbed_regex = re.compile(r"\bMBED.+?_[A-Z0-9_]*")
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exclusions = re.compile(r"// *no-check-names|#error")
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self.log.debug("Looking for MBED names in {} files".format(len(files)))
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mbed_words = []
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for filename in files:
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with open(filename, "r", encoding="utf-8") as fp:
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for line_no, line in enumerate(fp):
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if exclusions.search(line):
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continue
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for name in mbed_regex.finditer(line):
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mbed_words.append(Match(
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filename,
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line,
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(line_no, name.start(), name.end()),
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name.group(0)
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))
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return mbed_words
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def parse_enum_consts(self, header_files):
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"""
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Parse all enum value constants that are declared.
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Args:
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* header_files: A List of filepaths to look through.
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Returns a List of Match objects for the findings.
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"""
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self.log.debug("Looking for enum consts in {} files".format(len(header_files)))
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enum_consts = []
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for header_file in header_files:
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# Emulate a finite state machine to parse enum declarations.
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# 0 = not in enum
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# 1 = inside enum
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# 2 = almost inside enum
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state = 0
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with open(header_file, "r", encoding="utf-8") as header:
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for line_no, line in enumerate(header):
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# Match typedefs and brackets only when they are at the
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# beginning of the line -- if they are indented, they might
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# be sub-structures within structs, etc.
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if state == 0 and re.match(r"^(typedef +)?enum +{", line):
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state = 1
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elif state == 0 and re.match(r"^(typedef +)?enum", line):
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state = 2
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elif state == 2 and re.match(r"^{", line):
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state = 1
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elif state == 1 and re.match(r"^}", line):
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state = 0
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elif state == 1 and not re.match(r" *#", line):
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enum_const = re.match(r" *(?P<enum_const>\w+)", line)
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if enum_const:
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enum_consts.append(Match(
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header_file,
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line,
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(line_no, enum_const.start(), enum_const.end()),
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enum_const.group("enum_const")))
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return enum_consts
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def parse_identifiers(self, header_files):
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"""
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Parse all lines of a header where a function identifier is declared,
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based on some huersitics. Highly dependent on formatting style.
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Args:
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* header_files: A List of filepaths to look through.
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Returns a List of Match objects with identifiers.
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"""
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identifier_regex = re.compile(
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# Match " something(a" or " *something(a". Functions.
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# Assumptions:
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# - function definition from return type to one of its arguments is
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# all on one line (enforced by the previous_line concat below)
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# - function definition line only contains alphanumeric, asterisk,
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# underscore, and open bracket
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r".* \**(\w+) *\( *\w|"
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# Match "(*something)(". Flexible with spaces.
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r".*\( *\* *(\w+) *\) *\(|"
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# Match names of named data structures.
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r"(?:typedef +)?(?:struct|union|enum) +(\w+)(?: *{)?$|"
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# Match names of typedef instances, after closing bracket.
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r"}? *(\w+)[;[].*")
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exclusion_lines = re.compile(r"^("
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r"extern +\"C\"|"
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r"(typedef +)?(struct|union|enum)( *{)?$|"
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r"} *;?$|"
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r"$|"
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r"//|"
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r"#"
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r")")
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self.log.debug("Looking for identifiers in {} files".format(len(header_files)))
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identifiers = []
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for header_file in header_files:
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with open(header_file, "r", encoding="utf-8") as header:
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in_block_comment = False
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previous_line = ""
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for line_no, line in enumerate(header):
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# Skip parsing this line if a block comment ends on it,
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# but don't skip if it has just started -- there is a chance
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# it ends on the same line.
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if re.search(r"/\*", line):
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in_block_comment = not in_block_comment
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if re.search(r"\*/", line):
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in_block_comment = not in_block_comment
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continue
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if in_block_comment:
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previous_line = ""
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continue
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if exclusion_lines.match(line):
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previous_line = ""
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continue
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# If the line contains only space-separated alphanumeric
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# characters (or underscore, asterisk, or, open bracket),
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# and nothing else, high chance it's a declaration that
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# continues on the next line
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if re.match(r"^([\w\*\(]+\s+)+$", line):
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previous_line += line
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continue
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# If previous line seemed to start an unfinished declaration
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# (as above), concat and treat them as one.
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if previous_line:
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line = previous_line.strip() + " " + line.strip()
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previous_line = ""
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# Skip parsing if line has a space in front = hueristic to
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# skip function argument lines (highly subject to formatting
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# changes)
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if line[0] == " ":
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continue
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identifier = identifier_regex.search(line)
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if identifier:
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# Find the group that matched, and append it
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for group in identifier.groups():
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if group:
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identifiers.append(Match(
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header_file,
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line,
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(line_no, identifier.start(), identifier.end()),
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group))
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return identifiers
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def parse_symbols(self):
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"""
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Compile the Mbed TLS libraries, and parse the TLS, Crypto, and x509
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object files using nm to retrieve the list of referenced symbols.
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Exceptions thrown here are rethrown because they would be critical
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errors that void several tests, and thus needs to halt the program. This
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is explicitly done for clarity.
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Returns a List of unique symbols defined and used in the libraries.
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"""
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self.log.info("Compiling...")
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symbols = []
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# Back up the config and atomically compile with the full configratuion.
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shutil.copy("include/mbedtls/mbedtls_config.h",
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"include/mbedtls/mbedtls_config.h.bak")
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try:
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# Use check=True in all subprocess calls so that failures are raised
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# as exceptions and logged.
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subprocess.run(
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["python3", "scripts/config.py", "full"],
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universal_newlines=True,
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check=True
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)
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my_environment = os.environ.copy()
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my_environment["CFLAGS"] = "-fno-asynchronous-unwind-tables"
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subprocess.run(
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["make", "clean", "lib"],
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env=my_environment,
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universal_newlines=True,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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check=True
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)
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# Perform object file analysis using nm
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symbols = self.parse_symbols_from_nm(
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["library/libmbedcrypto.a",
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"library/libmbedtls.a",
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"library/libmbedx509.a"])
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subprocess.run(
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["make", "clean"],
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universal_newlines=True,
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check=True
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)
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except subprocess.CalledProcessError as error:
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self.log.debug(error.output)
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self.set_return_code(2)
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raise error
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finally:
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shutil.move("include/mbedtls/mbedtls_config.h.bak",
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"include/mbedtls/mbedtls_config.h")
|
|
|
|
return symbols
|
|
|
|
def parse_symbols_from_nm(self, object_files):
|
|
"""
|
|
Run nm to retrieve the list of referenced symbols in each object file.
|
|
Does not return the position data since it is of no use.
|
|
|
|
Args:
|
|
* object_files: a List of compiled object files to search through.
|
|
|
|
Returns a List of unique symbols defined and used in any of the object
|
|
files.
|
|
"""
|
|
nm_undefined_regex = re.compile(r"^\S+: +U |^$|^\S+:$")
|
|
nm_valid_regex = re.compile(r"^\S+( [0-9A-Fa-f]+)* . _*(?P<symbol>\w+)")
|
|
nm_exclusions = ("FStar", "Hacl")
|
|
|
|
symbols = []
|
|
|
|
# Gather all outputs of nm
|
|
nm_output = ""
|
|
for lib in object_files:
|
|
nm_output += subprocess.run(
|
|
["nm", "-og", lib],
|
|
universal_newlines=True,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.STDOUT,
|
|
check=True
|
|
).stdout
|
|
|
|
for line in nm_output.splitlines():
|
|
if not nm_undefined_regex.match(line):
|
|
symbol = nm_valid_regex.match(line)
|
|
if (symbol and not symbol.group("symbol").startswith(
|
|
nm_exclusions)):
|
|
symbols.append(symbol.group("symbol"))
|
|
else:
|
|
self.log.error(line)
|
|
|
|
return symbols
|
|
|
|
def perform_checks(self, show_problems=True):
|
|
"""
|
|
Perform each check in order, output its PASS/FAIL status. Maintain an
|
|
overall test status, and output that at the end.
|
|
|
|
Args:
|
|
* show_problems: whether to show the problematic examples.
|
|
"""
|
|
self.log.info("=============")
|
|
problems = 0
|
|
|
|
problems += self.check_symbols_declared_in_header(show_problems)
|
|
|
|
pattern_checks = [("macros", MACRO_PATTERN),
|
|
("enum_consts", CONSTANTS_PATTERN),
|
|
("identifiers", IDENTIFIER_PATTERN)]
|
|
for group, check_pattern in pattern_checks:
|
|
problems += self.check_match_pattern(
|
|
show_problems, group, check_pattern)
|
|
|
|
problems += self.check_for_typos(show_problems)
|
|
|
|
self.log.info("=============")
|
|
if problems > 0:
|
|
self.log.info("FAIL: {0} problem(s) to fix".format(str(problems)))
|
|
if not show_problems:
|
|
self.log.info("Remove --quiet to show the problems.")
|
|
else:
|
|
self.log.info("PASS")
|
|
|
|
def check_symbols_declared_in_header(self, show_problems):
|
|
"""
|
|
Perform a check that all detected symbols in the library object files
|
|
are properly declared in headers.
|
|
|
|
Args:
|
|
* show_problems: whether to show the problematic examples.
|
|
|
|
Returns the number of problems that need fixing.
|
|
"""
|
|
problems = []
|
|
|
|
for symbol in self.parse_result["symbols"]:
|
|
found_symbol_declared = False
|
|
for identifier_match in self.parse_result["identifiers"]:
|
|
if symbol == identifier_match.name:
|
|
found_symbol_declared = True
|
|
break
|
|
|
|
if not found_symbol_declared:
|
|
problems.append(SymbolNotInHeader(symbol))
|
|
|
|
self.output_check_result("All symbols in header", problems, show_problems)
|
|
return len(problems)
|
|
|
|
|
|
def check_match_pattern(self, show_problems, group_to_check, check_pattern):
|
|
"""
|
|
Perform a check that all items of a group conform to a regex pattern.
|
|
|
|
Args:
|
|
* show_problems: whether to show the problematic examples.
|
|
* group_to_check: string key to index into self.parse_result.
|
|
* check_pattern: the regex to check against.
|
|
|
|
Returns the number of problems that need fixing.
|
|
"""
|
|
problems = []
|
|
|
|
for item_match in self.parse_result[group_to_check]:
|
|
if not re.match(check_pattern, item_match.name):
|
|
problems.append(PatternMismatch(check_pattern, item_match))
|
|
# Double underscore is a reserved identifier, never to be used
|
|
if re.match(r".*__.*", item_match.name):
|
|
problems.append(PatternMismatch("double underscore", item_match))
|
|
|
|
self.output_check_result(
|
|
"Naming patterns of {}".format(group_to_check),
|
|
problems,
|
|
show_problems)
|
|
return len(problems)
|
|
|
|
def check_for_typos(self, show_problems):
|
|
"""
|
|
Perform a check that all words in the soure code beginning with MBED are
|
|
either defined as macros, or as enum constants.
|
|
|
|
Args:
|
|
* show_problems: whether to show the problematic examples.
|
|
|
|
Returns the number of problems that need fixing.
|
|
"""
|
|
problems = []
|
|
|
|
# Set comprehension, equivalent to a list comprehension inside set()
|
|
all_caps_names = {
|
|
match.name
|
|
for match
|
|
in self.parse_result["macros"] + self.parse_result["enum_consts"]}
|
|
typo_exclusion = re.compile(r"XXX|__|_$|^MBEDTLS_.*CONFIG_FILE$")
|
|
|
|
for name_match in self.parse_result["mbed_words"]:
|
|
found = name_match.name in all_caps_names
|
|
|
|
# Since MBEDTLS_PSA_ACCEL_XXX defines are defined by the
|
|
# PSA driver, they will not exist as macros. However, they
|
|
# should still be checked for typos using the equivalent
|
|
# BUILTINs that exist.
|
|
if "MBEDTLS_PSA_ACCEL_" in name_match.name:
|
|
found = name_match.name.replace(
|
|
"MBEDTLS_PSA_ACCEL_",
|
|
"MBEDTLS_PSA_BUILTIN_") in all_caps_names
|
|
|
|
if not found and not typo_exclusion.search(name_match.name):
|
|
problems.append(Typo(name_match))
|
|
|
|
self.output_check_result("Likely typos", problems, show_problems)
|
|
return len(problems)
|
|
|
|
def output_check_result(self, name, problems, show_problems):
|
|
"""
|
|
Write out the PASS/FAIL status of a performed check depending on whether
|
|
there were problems.
|
|
|
|
Args:
|
|
* show_problems: whether to show the problematic examples.
|
|
"""
|
|
if problems:
|
|
self.set_return_code(1)
|
|
self.log.info("{}: FAIL".format(name))
|
|
if show_problems:
|
|
self.log.info("")
|
|
for problem in problems:
|
|
self.log.warning("{}\n".format(str(problem)))
|
|
else:
|
|
self.log.info("{}: PASS".format(name))
|
|
|
|
def check_repo_path():
|
|
"""
|
|
Check that the current working directory is the project root, and throw
|
|
an exception if not.
|
|
"""
|
|
if (not os.path.isdir("include") or
|
|
not os.path.isdir("tests") or
|
|
not os.path.isdir("library")):
|
|
raise Exception("This script must be run from Mbed TLS root")
|
|
|
|
def main():
|
|
"""
|
|
Perform argument parsing, and create an instance of NameCheck to begin the
|
|
core operation.
|
|
"""
|
|
parser = argparse.ArgumentParser(
|
|
formatter_class=argparse.RawDescriptionHelpFormatter,
|
|
description=(
|
|
"This script confirms that the naming of all symbols and identifiers "
|
|
"in Mbed TLS are consistent with the house style and are also "
|
|
"self-consistent.\n\n"
|
|
"Expected to be run from the MbedTLS root directory."))
|
|
|
|
parser.add_argument("-v", "--verbose",
|
|
action="store_true",
|
|
help="show parse results")
|
|
|
|
parser.add_argument("-q", "--quiet",
|
|
action="store_true",
|
|
help="hide unnecessary text and problematic examples")
|
|
|
|
args = parser.parse_args()
|
|
|
|
try:
|
|
check_repo_path()
|
|
name_check = NameCheck()
|
|
name_check.setup_logger(verbose=args.verbose)
|
|
name_check.parse_names_in_source()
|
|
name_check.perform_checks(show_problems=not args.quiet)
|
|
sys.exit(name_check.return_code)
|
|
except Exception: # pylint: disable=broad-except
|
|
traceback.print_exc()
|
|
sys.exit(2)
|
|
|
|
if __name__ == "__main__":
|
|
main()
|