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https://gitlab.torproject.org/tpo/core/tor.git
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296 lines
9.4 KiB
Python
Executable File
296 lines
9.4 KiB
Python
Executable File
#!/usr/bin/python
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# Copyright 2018 The Tor Project, Inc. See LICENSE file for licensing info.
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"""This script looks through all the directories for files matching *.c or
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*.h, and checks their #include directives to make sure that only "permitted"
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headers are included.
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Any #include directives with angle brackets (like #include <stdio.h>) are
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ignored -- only directives with quotes (like #include "foo.h") are
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considered.
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To decide what includes are permitted, this script looks at a .may_include
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file in each directory. This file contains empty lines, #-prefixed
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comments, filenames (like "lib/foo/bar.h") and file globs (like lib/*/*.h)
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for files that are permitted.
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The script exits with an error if any non-permitted includes are found.
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.may_include files that contain "!advisory" are considered advisory.
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Advisory .may_include files only result in warnings, rather than errors.
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"""
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# Future imports for Python 2.7, mandatory in 3.0
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from __future__ import division
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from __future__ import print_function
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from __future__ import unicode_literals
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import fnmatch
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import os
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import re
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import sys
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if sys.version_info[0] <= 2:
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def open_file(fname):
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return open(fname, 'r')
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else:
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def open_file(fname):
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return open(fname, 'r', encoding='utf-8')
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def warn(msg):
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print(msg, file=sys.stderr)
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def fname_is_c(fname):
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""" Return true iff 'fname' is the name of a file that we should
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search for possibly disallowed #include directives. """
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if fname.endswith(".h") or fname.endswith(".c"):
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bname = os.path.basename(fname)
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return not (bname.startswith(".") or bname.startswith("#"))
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else:
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return False
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INCLUDE_PATTERN = re.compile(r'\s*#\s*include\s+"([^"]*)"')
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RULES_FNAME = ".may_include"
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ALLOWED_PATTERNS = [
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re.compile(r'^.*\*\.(h|inc)$'),
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re.compile(r'^.*/.*\.h$'),
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re.compile(r'^ext/.*\.c$'),
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re.compile(r'^orconfig.h$'),
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re.compile(r'^micro-revision.i$'),
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]
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def pattern_is_normal(s):
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for p in ALLOWED_PATTERNS:
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if p.match(s):
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return True
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return False
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class Error(object):
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def __init__(self, location, msg, is_advisory=False):
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self.location = location
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self.msg = msg
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self.is_advisory = is_advisory
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def __str__(self):
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return "{} at {}".format(self.msg, self.location)
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class Rules(object):
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""" A 'Rules' object is the parsed version of a .may_include file. """
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def __init__(self, dirpath):
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self.dirpath = dirpath
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if dirpath.startswith("src/"):
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self.incpath = dirpath[4:]
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else:
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self.incpath = dirpath
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self.patterns = []
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self.usedPatterns = set()
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self.is_advisory = False
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def addPattern(self, pattern):
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if pattern == "!advisory":
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self.is_advisory = True
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return
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if not pattern_is_normal(pattern):
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warn("Unusual pattern {} in {}".format(pattern, self.dirpath))
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self.patterns.append(pattern)
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def includeOk(self, path):
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for pattern in self.patterns:
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if fnmatch.fnmatchcase(path, pattern):
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self.usedPatterns.add(pattern)
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return True
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return False
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def applyToLines(self, lines, loc_prefix=""):
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lineno = 0
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for line in lines:
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lineno += 1
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m = INCLUDE_PATTERN.match(line)
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if m:
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include = m.group(1)
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if not self.includeOk(include):
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yield Error("{}{}".format(loc_prefix,str(lineno)),
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"Forbidden include of {}".format(include),
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is_advisory=self.is_advisory)
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def applyToFile(self, fname, f):
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for error in self.applyToLines(iter(f), "{}:".format(fname)):
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yield error
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def noteUnusedRules(self):
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for p in self.patterns:
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if p not in self.usedPatterns:
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warn("Pattern {} in {} was never used.".format(p, self.dirpath))
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def getAllowedDirectories(self):
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allowed = []
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for p in self.patterns:
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m = re.match(r'^(.*)/\*\.(h|inc)$', p)
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if m:
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allowed.append(m.group(1))
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continue
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m = re.match(r'^(.*)/[^/]*$', p)
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if m:
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allowed.append(m.group(1))
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continue
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return allowed
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include_rules_cache = {}
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def load_include_rules(fname):
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""" Read a rules file from 'fname', and return it as a Rules object.
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Return 'None' if fname does not exist.
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"""
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if fname in include_rules_cache:
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return include_rules_cache[fname]
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if not os.path.exists(fname):
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include_rules_cache[fname] = None
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return None
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result = Rules(os.path.split(fname)[0])
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with open_file(fname) as f:
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for line in f:
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line = line.strip()
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if line.startswith("#") or not line:
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continue
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result.addPattern(line)
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include_rules_cache[fname] = result
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return result
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def get_all_include_rules():
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"""Return a list of all the Rules objects we have loaded so far,
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sorted by their directory names."""
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return [ rules for (fname,rules) in
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sorted(include_rules_cache.items())
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if rules is not None ]
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def remove_self_edges(graph):
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"""Takes a directed graph in as an adjacency mapping (a mapping from
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node to a list of the nodes to which it connects).
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Remove all edges from a node to itself."""
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for k in list(graph):
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graph[k] = [ d for d in graph[k] if d != k ]
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def toposort(graph, limit=100):
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"""Takes a directed graph in as an adjacency mapping (a mapping from
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node to a list of the nodes to which it connects). Tries to
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perform a topological sort on the graph, arranging the nodes into
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"levels", such that every member of each level is only reachable
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by members of later levels.
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Returns a list of the members of each level.
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Modifies the input graph, removing every member that could be
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sorted. If the graph does not become empty, then it contains a
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cycle.
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"limit" is the max depth of the graph after which we give up trying
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to sort it and conclude we have a cycle.
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"""
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all_levels = []
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n = 0
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while graph:
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n += 0
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cur_level = []
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all_levels.append(cur_level)
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for k in list(graph):
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graph[k] = [ d for d in graph[k] if d in graph ]
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if graph[k] == []:
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cur_level.append(k)
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for k in cur_level:
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del graph[k]
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n += 1
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if n > limit:
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break
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return all_levels
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def consider_include_rules(fname, f):
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dirpath = os.path.split(fname)[0]
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rules_fname = os.path.join(dirpath, RULES_FNAME)
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rules = load_include_rules(os.path.join(dirpath, RULES_FNAME))
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if rules is None:
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return
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for err in rules.applyToFile(fname, f):
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yield err
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list_unused = False
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log_sorted_levels = False
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def walk_c_files(topdir="src"):
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"""Run through all .c and .h files under topdir, looking for
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include-rule violations. Yield those violations."""
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for dirpath, dirnames, fnames in os.walk(topdir):
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for fname in fnames:
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if fname_is_c(fname):
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fullpath = os.path.join(dirpath,fname)
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with open(fullpath) as f:
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for err in consider_include_rules(fullpath, f):
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yield err
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def run_check_includes(topdir, list_unused=False, log_sorted_levels=False,
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list_advisories=False):
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trouble = False
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for err in walk_c_files(topdir):
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if err.is_advisory and not list_advisories:
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continue
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print(err, file=sys.stderr)
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if not err.is_advisory:
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trouble = True
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if trouble:
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warn(
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"""To change which includes are allowed in a C file, edit the {}
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files in its enclosing directory.""".format(RULES_FNAME))
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sys.exit(1)
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if list_unused:
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for rules in get_all_include_rules():
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rules.noteUnusedRules()
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uses_dirs = { }
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for rules in get_all_include_rules():
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uses_dirs[rules.incpath] = rules.getAllowedDirectories()
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remove_self_edges(uses_dirs)
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all_levels = toposort(uses_dirs)
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if log_sorted_levels:
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for (n, cur_level) in enumerate(all_levels):
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if cur_level:
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print(n, cur_level)
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if uses_dirs:
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print("There are circular .may_include dependencies in here somewhere:",
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uses_dirs)
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sys.exit(1)
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def main(argv):
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import argparse
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progname = argv[0]
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parser = argparse.ArgumentParser(prog=progname)
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parser.add_argument("--toposort", action="store_true",
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help="Print a topologically sorted list of modules")
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parser.add_argument("--list-unused", action="store_true",
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help="List unused lines in .may_include files.")
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parser.add_argument("--list-advisories", action="store_true",
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help="List advisories as well as forbidden includes")
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parser.add_argument("topdir", default="src", nargs="?",
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help="Top-level directory for the tor source")
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args = parser.parse_args(argv[1:])
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run_check_includes(topdir=args.topdir,
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log_sorted_levels=args.toposort,
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list_unused=args.list_unused,
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list_advisories=args.list_advisories)
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if __name__ == '__main__':
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main(sys.argv)
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