533 lines
18 KiB
Python
Executable file
533 lines
18 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.
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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
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MACRO_PATTERN = r"^MBEDTLS_[0-9A-Z_]*[0-9A-Z]$|^YOTTA_[0-9A-Z_]*[0-9A-Z]$"
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IDENTIFIER_PATTERN = r"^(mbedtls|psa)_[0-9a-z_]*[0-9a-z]$"
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class Match(object):
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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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return self.name
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class Problem(object):
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def __init__(self):
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self.textwrapper = textwrap.TextWrapper()
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self.textwrapper.initial_indent = " * "
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self.textwrapper.subsequent_indent = " "
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class SymbolNotInHeader(Problem):
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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):
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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}' does not match the required pattern '{2}'."
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.format(self.match.filename, self.match.name, self.pattern))
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class Typo(Problem):
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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}' looks like a typo. It was not found in any macros or "
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"any enums. If this is not a typo, put //no-check-names after it."
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.format(self.match.filename, self.match.name))
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class NameCheck(object):
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def __init__(self):
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self.log = None
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self.check_repo_path()
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self.return_code = 0
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self.excluded_files = ["compat-1.3.h"]
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self.typo_check_pattern = r"XXX|__|_$|^MBEDTLS_.*CONFIG_FILE$"
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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.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 check_repo_path(self):
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"""
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Check that the current working directory is the project root, and throw
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an exception if not.
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"""
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current_dir = os.path.realpath('.')
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root_dir = os.path.dirname(os.path.dirname(
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os.path.dirname(os.path.realpath(__file__))))
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if current_dir != root_dir:
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raise Exception("Must be run from Mbed TLS root")
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def get_files(self, directory):
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filenames = []
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for root, dirs, 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((".c", ".h"))):
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filenames.append(os.path.join(root, filename))
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return filenames
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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:
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A list of Match objects for the macros.
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"""
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MACRO_REGEX = r"#define (?P<macro>\w+)"
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NON_MACROS = (
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"asm", "inline", "EMIT", "_CRT_SECURE_NO_DEPRECATE", "MULADDC_"
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)
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macros = []
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for header_file in header_files:
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with open(header_file, "r") as header:
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for line in header:
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macro = re.search(MACRO_REGEX, line)
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if (macro and
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not macro.group("macro").startswith(NON_MACROS)):
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macros.append(Match(
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header_file,
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line,
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(macro.start(), macro.end()),
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macro.group("macro")))
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return macros
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def parse_MBED_names(self, header_files, library_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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Args:
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header_files: A list of filepaths to look through.
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library_files: A list of filepaths to look through.
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Returns:
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A list of Match objects for words beginning with MBED.
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"""
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MBED_names = []
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for filename in header_files + library_files:
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with open(filename, "r") as fp:
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for line in fp:
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for name in re.finditer(r"\bMBED.+?_[A-Z0-9_]*", line):
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MBED_names.append(Match(
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filename,
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line,
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(name.start(), name.end()),
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name.group(0)
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))
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return MBED_names
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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:
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A list of (enum constants, containing filename).
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"""
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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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state = 0
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with open(header_file, "r") as header:
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for line in header:
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if state is 0 and re.match(r"^(typedef )?enum {", line):
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state = 1
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elif state is 0 and re.match(r"^(typedef )?enum", line):
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state = 2
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elif state is 2 and re.match(r"^{", line):
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state = 1
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elif state is 1 and re.match(r"^}", line):
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state = 0
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elif state is 1:
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enum_const = re.match(r"^\s*(?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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(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. Assumes every line that is not a comment or a
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preprocessor directive contains some identifier.
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Args:
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header_files: A list of filepaths to look through.
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Returns:
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A list of (identifier, containing filename)
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"""
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EXCLUDED_DECLARATIONS = (
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r"^(extern \"C\"|(typedef )?(struct|enum)( {)?$|};?$|$)"
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)
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identifiers = []
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for header_file in header_files:
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with open(header_file, "r") as header:
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in_block_comment = False
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for line in header:
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# Skip parsing this line if it begins or ends a block
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# comment, and set the state machine's state.
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if re.search(r"/\*", line):
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in_block_comment = True
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continue
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elif re.search(r"\*/", line) and in_block_comment:
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in_block_comment = False
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continue
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# Skip parsing this line if it's a line comment, or if it
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# begins with a preprocessor directive
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if in_block_comment or re.match(r"(//|#)", line):
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continue
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if re.match(EXCLUDED_DECLARATIONS, line):
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continue
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identifier = re.search(
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# Matches: "mbedtls_aes_init("
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r"([a-zA-Z_][a-zA-Z0-9_]*)\(|"
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# Matches: "(*f_rng)("
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r"\(\*(.+)\)\(|"
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# TODO: unknown purpose
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r"(\w+)\W*$",
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line
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)
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if identifier:
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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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(identifier.start(), identifier.end()),
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identifier.group(0)))
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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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Returns:
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A list of unique symbols defined and used in the libraries.
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"""
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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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subprocess.run(
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["perl", "scripts/config.pl", "full"],
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encoding=sys.stdout.encoding,
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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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encoding=sys.stdout.encoding,
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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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symbols.sort()
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subprocess.run(
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["make", "clean"],
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encoding=sys.stdout.encoding,
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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.error(error)
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self.set_return_code(2)
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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")
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return symbols
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def parse_symbols_from_nm(self, object_files):
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"""
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Run nm to retrieve the list of referenced symbols in each object file.
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Does not return the position data since it is of no use.
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Returns:
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A list of unique symbols defined and used in any of the object files.
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"""
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UNDEFINED_SYMBOL = r"^\S+: +U |^$|^\S+:$"
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VALID_SYMBOL = r"^\S+( [0-9A-Fa-f]+)* . _*(?P<symbol>\w+)"
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symbols = []
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nm_output = ""
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for lib in object_files:
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nm_output += subprocess.run(
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["nm", "-og", lib],
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encoding=sys.stdout.encoding,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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check=True
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).stdout
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for line in nm_output.splitlines():
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if not re.match(UNDEFINED_SYMBOL, line):
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symbol = re.match(VALID_SYMBOL, line)
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if symbol:
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symbols.append(symbol.group('symbol'))
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else:
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self.log.error(line)
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return symbols
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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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m_headers = self.get_files(os.path.join("include", "mbedtls"))
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p_headers = self.get_files(os.path.join("include", "psa"))
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libraries = self.get_files("library")
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all_macros = self.parse_macros(m_headers + ["configs/config-default.h"])
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enum_consts = self.parse_enum_consts(m_headers)
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identifiers = self.parse_identifiers(m_headers + p_headers)
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symbols = self.parse_symbols()
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mbed_names = self.parse_MBED_names(m_headers, libraries)
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# Remove identifier macros like mbedtls_printf or mbedtls_calloc
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macros = list(set(all_macros) - set(identifiers))
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self.log.info("Found:")
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self.log.info(" {} Macros".format(len(all_macros)))
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self.log.info(" {} Enum Constants".format(len(enum_consts)))
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self.log.info(" {} Identifiers".format(len(identifiers)))
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self.log.info(" {} 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": 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_names": mbed_names
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}
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def perform_checks(self):
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"""
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Perform each check in order, output its PASS/FAIL status. Maintain an
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overall test status, and output that at the end.
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"""
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problems = 0
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problems += self.check_symbols_declared_in_header()
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pattern_checks = [
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("macros", MACRO_PATTERN),
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("enum_consts", MACRO_PATTERN),
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("identifiers", IDENTIFIER_PATTERN)]
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for group, check_pattern in pattern_checks:
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problems += self.check_match_pattern(group, check_pattern)
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problems += self.check_for_typos()
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self.log.info("=============")
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if problems > 0:
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self.log.info("FAIL: {0} problem(s) to fix".format(str(problems)))
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else:
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self.log.info("PASS")
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def check_symbols_declared_in_header(self):
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"""
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Perform a check that all detected symbols in the library object files
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are properly declared in headers.
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Outputs to the logger the PASS/FAIL status, followed by the location of
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problems.
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Returns the number of problems that needs fixing.
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"""
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problems = []
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for symbol in self.parse_result["symbols"]:
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found_symbol_declared = False
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for identifier_match in self.parse_result["identifiers"]:
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if symbol == identifier_match.name:
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found_symbol_declared = True
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break
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if not found_symbol_declared:
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problems.append(SymbolNotInHeader(symbol))
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if problems:
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self.set_return_code(1)
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self.log.info("All symbols in header: FAIL")
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for problem in problems:
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self.log.info(str(problem) + "\n")
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else:
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self.log.info("All symbols in header: PASS")
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return len(problems)
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def check_match_pattern(self, group_to_check, check_pattern):
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problems = []
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for item_match in self.parse_result[group_to_check]:
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if not re.match(check_pattern, item_match.name):
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problems.append(PatternMismatch(check_pattern, item_match))
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if problems:
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self.set_return_code(1)
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self.log.info("Naming patterns of {}: FAIL".format(group_to_check))
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for problem in problems:
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self.log.info(str(problem) + "\n")
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else:
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self.log.info("Naming patterns of {}: PASS".format(group_to_check))
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return len(problems)
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def check_for_typos(self):
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problems = []
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all_caps_names = list(set([
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match.name for match
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in self.parse_result["macros"] + self.parse_result["enum_consts"]]
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))
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TYPO_EXCLUSION = r"XXX|__|_$|^MBEDTLS_.*CONFIG_FILE$"
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for name_match in self.parse_result["mbed_names"]:
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if name_match.name not in all_caps_names:
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if not re.search(TYPO_EXCLUSION, name_match.name):
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problems.append(Typo(name_match))
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if problems:
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self.set_return_code(1)
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self.log.info("Likely typos: FAIL")
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for problem in problems:
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self.log.info(str(problem) + "\n")
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else:
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self.log.info("Likely typos: PASS")
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return len(problems)
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def main():
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"""
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Main function, parses command-line arguments.
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"""
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parser = argparse.ArgumentParser(
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formatter_class=argparse.RawDescriptionHelpFormatter,
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description=(
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"This script confirms that the naming of all symbols and identifiers "
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"in Mbed TLS are consistent with the house style and are also "
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"self-consistent.\n\n"
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"Expected to be run from the MbedTLS root directory."))
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parser.add_argument("-v", "--verbose",
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action="store_true",
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help="enable script debug outputs")
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args = parser.parse_args()
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try:
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name_check = NameCheck()
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name_check.setup_logger(verbose=args.verbose)
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name_check.parse_names_in_source()
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name_check.perform_checks()
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sys.exit(name_check.return_code)
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except Exception:
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traceback.print_exc()
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sys.exit(2)
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if __name__ == "__main__":
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main()
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