| #!/usr/bin/env python |
| """Generates config files for Android file system properties. |
| |
| This script is used for generating configuration files for configuring |
| Android filesystem properties. Internally, its composed of a plug-able |
| interface to support the understanding of new input and output parameters. |
| |
| Run the help for a list of supported plugins and their capabilities. |
| |
| Further documentation can be found in the README. |
| """ |
| |
| import argparse |
| import ConfigParser |
| import ctypes |
| import re |
| import sys |
| import textwrap |
| |
| # Keep the tool in one file to make it easy to run. |
| # pylint: disable=too-many-lines |
| |
| |
| # Lowercase generator used to be inline with @staticmethod. |
| class generator(object): # pylint: disable=invalid-name |
| """A decorator class to add commandlet plugins. |
| |
| Used as a decorator to classes to add them to |
| the internal plugin interface. Plugins added |
| with @generator() are automatically added to |
| the command line. |
| |
| For instance, to add a new generator |
| called foo and have it added just do this: |
| |
| @generator("foo") |
| class FooGen(object): |
| ... |
| """ |
| _generators = {} |
| |
| def __init__(self, gen): |
| """ |
| Args: |
| gen (str): The name of the generator to add. |
| |
| Raises: |
| ValueError: If there is a similarly named generator already added. |
| |
| """ |
| self._gen = gen |
| |
| if gen in generator._generators: |
| raise ValueError('Duplicate generator name: ' + gen) |
| |
| generator._generators[gen] = None |
| |
| def __call__(self, cls): |
| |
| generator._generators[self._gen] = cls() |
| return cls |
| |
| @staticmethod |
| def get(): |
| """Gets the list of generators. |
| |
| Returns: |
| The list of registered generators. |
| """ |
| return generator._generators |
| |
| |
| class Utils(object): |
| """Various assorted static utilities.""" |
| |
| @staticmethod |
| def in_any_range(value, ranges): |
| """Tests if a value is in a list of given closed range tuples. |
| |
| A range tuple is a closed range. That means it's inclusive of its |
| start and ending values. |
| |
| Args: |
| value (int): The value to test. |
| range [(int, int)]: The closed range list to test value within. |
| |
| Returns: |
| True if value is within the closed range, false otherwise. |
| """ |
| |
| return any(lower <= value <= upper for (lower, upper) in ranges) |
| |
| @staticmethod |
| def get_login_and_uid_cleansed(aid): |
| """Returns a passwd/group file safe logon and uid. |
| |
| This checks that the logon and uid of the AID do not |
| contain the delimiter ":" for a passwd/group file. |
| |
| Args: |
| aid (AID): The aid to check |
| |
| Returns: |
| logon, uid of the AID after checking its safe. |
| |
| Raises: |
| ValueError: If there is a delimiter charcter found. |
| """ |
| logon = aid.friendly |
| uid = aid.normalized_value |
| if ':' in uid: |
| raise ValueError( |
| 'Cannot specify delimiter character ":" in uid: "%s"' % uid) |
| if ':' in logon: |
| raise ValueError( |
| 'Cannot specify delimiter character ":" in logon: "%s"' % |
| logon) |
| return logon, uid |
| |
| |
| class AID(object): |
| """This class represents an Android ID or an AID. |
| |
| Attributes: |
| identifier (str): The identifier name for a #define. |
| value (str) The User Id (uid) of the associate define. |
| found (str) The file it was found in, can be None. |
| normalized_value (str): Same as value, but base 10. |
| friendly (str): The friendly name of aid. |
| """ |
| |
| PREFIX = 'AID_' |
| |
| # Some of the AIDS like AID_MEDIA_EX had names like mediaex |
| # list a map of things to fixup until we can correct these |
| # at a later date. |
| _FIXUPS = { |
| 'media_drm': 'mediadrm', |
| 'media_ex': 'mediaex', |
| 'media_codec': 'mediacodec' |
| } |
| |
| def __init__(self, identifier, value, found, login_shell): |
| """ |
| Args: |
| identifier: The identifier name for a #define <identifier>. |
| value: The value of the AID, aka the uid. |
| found (str): The file found in, not required to be specified. |
| login_shell (str): The shell field per man (5) passwd file. |
| Raises: |
| ValueError: if the friendly name is longer than 31 characters as |
| that is bionic's internal buffer size for name. |
| ValueError: if value is not a valid string number as processed by |
| int(x, 0) |
| """ |
| self.identifier = identifier |
| self.value = value |
| self.found = found |
| self.login_shell = login_shell |
| |
| try: |
| self.normalized_value = str(int(value, 0)) |
| except ValueError: |
| raise ValueError( |
| 'Invalid "value", not aid number, got: \"%s\"' % value) |
| |
| # Where we calculate the friendly name |
| friendly = identifier[len(AID.PREFIX):].lower() |
| self.friendly = AID._fixup_friendly(friendly) |
| |
| if len(self.friendly) > 31: |
| raise ValueError( |
| 'AID names must be under 32 characters "%s"' % self.friendly) |
| |
| def __eq__(self, other): |
| |
| return self.identifier == other.identifier \ |
| and self.value == other.value and self.found == other.found \ |
| and self.normalized_value == other.normalized_value \ |
| and self.login_shell == other.login_shell |
| |
| @staticmethod |
| def is_friendly(name): |
| """Determines if an AID is a freindly name or C define. |
| |
| For example if name is AID_SYSTEM it returns false, if name |
| was system, it would return true. |
| |
| Returns: |
| True if name is a friendly name False otherwise. |
| """ |
| |
| return not name.startswith(AID.PREFIX) |
| |
| @staticmethod |
| def _fixup_friendly(friendly): |
| """Fixup friendly names that historically don't follow the convention. |
| |
| Args: |
| friendly (str): The friendly name. |
| |
| Returns: |
| The fixedup friendly name as a str. |
| """ |
| |
| if friendly in AID._FIXUPS: |
| return AID._FIXUPS[friendly] |
| |
| return friendly |
| |
| |
| class FSConfig(object): |
| """Represents a filesystem config array entry. |
| |
| Represents a file system configuration entry for specifying |
| file system capabilities. |
| |
| Attributes: |
| mode (str): The mode of the file or directory. |
| user (str): The uid or #define identifier (AID_SYSTEM) |
| group (str): The gid or #define identifier (AID_SYSTEM) |
| caps (str): The capability set. |
| path (str): The path of the file or directory. |
| filename (str): The file it was found in. |
| """ |
| |
| def __init__(self, mode, user, group, caps, path, filename): |
| """ |
| Args: |
| mode (str): The mode of the file or directory. |
| user (str): The uid or #define identifier (AID_SYSTEM) |
| group (str): The gid or #define identifier (AID_SYSTEM) |
| caps (str): The capability set as a list. |
| path (str): The path of the file or directory. |
| filename (str): The file it was found in. |
| """ |
| self.mode = mode |
| self.user = user |
| self.group = group |
| self.caps = caps |
| self.path = path |
| self.filename = filename |
| |
| def __eq__(self, other): |
| |
| return self.mode == other.mode and self.user == other.user \ |
| and self.group == other.group and self.caps == other.caps \ |
| and self.path == other.path and self.filename == other.filename |
| |
| def __repr__(self): |
| return 'FSConfig(%r, %r, %r, %r, %r, %r)' % (self.mode, self.user, |
| self.group, self.caps, |
| self.path, self.filename) |
| |
| |
| class CapabilityHeaderParser(object): |
| """Parses capability.h file |
| |
| Parses a C header file and extracts lines starting with #define CAP_<name>. |
| """ |
| |
| _CAP_DEFINE = re.compile(r'\s*#define\s+(CAP_\S+)\s+(\S+)') |
| _SKIP_CAPS = ['CAP_LAST_CAP', 'CAP_TO_INDEX(x)', 'CAP_TO_MASK(x)'] |
| |
| def __init__(self, capability_header): |
| """ |
| Args: |
| capability_header (str): file name for the header file containing AID entries. |
| """ |
| |
| self.caps = {} |
| with open(capability_header) as open_file: |
| self._parse(open_file) |
| |
| def _parse(self, capability_file): |
| """Parses a capability header file. Internal use only. |
| |
| Args: |
| capability_file (file): The open capability header file to parse. |
| """ |
| |
| for line in capability_file: |
| match = CapabilityHeaderParser._CAP_DEFINE.match(line) |
| if match: |
| cap = match.group(1) |
| value = match.group(2) |
| |
| if not cap in self._SKIP_CAPS: |
| try: |
| self.caps[cap] = int(value, 0) |
| except ValueError: |
| sys.exit('Could not parse capability define "%s":"%s"' |
| % (cap, value)) |
| |
| |
| class AIDHeaderParser(object): |
| """Parses an android_filesystem_config.h file. |
| |
| Parses a C header file and extracts lines starting with #define AID_<name> |
| while capturing the OEM defined ranges and ignoring other ranges. It also |
| skips some hardcoded AIDs it doesn't need to generate a mapping for. |
| It provides some basic sanity checks. The information extracted from this |
| file can later be used to sanity check other things (like oem ranges) as |
| well as generating a mapping of names to uids. It was primarily designed to |
| parse the private/android_filesystem_config.h, but any C header should |
| work. |
| """ |
| |
| _SKIP_AIDS = [ |
| re.compile(r'%sUNUSED[0-9].*' % AID.PREFIX), |
| re.compile(r'%sAPP' % AID.PREFIX), |
| re.compile(r'%sUSER' % AID.PREFIX) |
| ] |
| _AID_DEFINE = re.compile(r'\s*#define\s+%s.*' % AID.PREFIX) |
| _OEM_START_KW = 'START' |
| _OEM_END_KW = 'END' |
| _OEM_RANGE = re.compile('%sOEM_RESERVED_[0-9]*_{0,1}(%s|%s)' % |
| (AID.PREFIX, _OEM_START_KW, _OEM_END_KW)) |
| # AID lines cannot end with _START or _END, ie AID_FOO is OK |
| # but AID_FOO_START is skiped. Note that AID_FOOSTART is NOT skipped. |
| _AID_SKIP_RANGE = ['_' + _OEM_START_KW, '_' + _OEM_END_KW] |
| _COLLISION_OK = ['AID_APP', 'AID_APP_START', 'AID_USER', 'AID_USER_OFFSET'] |
| |
| def __init__(self, aid_header): |
| """ |
| Args: |
| aid_header (str): file name for the header |
| file containing AID entries. |
| """ |
| self._aid_header = aid_header |
| self._aid_name_to_value = {} |
| self._aid_value_to_name = {} |
| self._oem_ranges = {} |
| |
| with open(aid_header) as open_file: |
| self._parse(open_file) |
| |
| try: |
| self._process_and_check() |
| except ValueError as exception: |
| sys.exit('Error processing parsed data: "%s"' % (str(exception))) |
| |
| def _parse(self, aid_file): |
| """Parses an AID header file. Internal use only. |
| |
| Args: |
| aid_file (file): The open AID header file to parse. |
| """ |
| |
| for lineno, line in enumerate(aid_file): |
| |
| def error_message(msg): |
| """Creates an error message with the current parsing state.""" |
| # pylint: disable=cell-var-from-loop |
| return 'Error "{}" in file: "{}" on line: {}'.format( |
| msg, self._aid_header, str(lineno)) |
| |
| if AIDHeaderParser._AID_DEFINE.match(line): |
| chunks = line.split() |
| identifier = chunks[1] |
| value = chunks[2] |
| |
| if any( |
| x.match(identifier) |
| for x in AIDHeaderParser._SKIP_AIDS): |
| continue |
| |
| try: |
| if AIDHeaderParser._is_oem_range(identifier): |
| self._handle_oem_range(identifier, value) |
| elif not any( |
| identifier.endswith(x) |
| for x in AIDHeaderParser._AID_SKIP_RANGE): |
| self._handle_aid(identifier, value) |
| except ValueError as exception: |
| sys.exit( |
| error_message('{} for "{}"'.format( |
| exception, identifier))) |
| |
| def _handle_aid(self, identifier, value): |
| """Handle an AID C #define. |
| |
| Handles an AID, sanity checking, generating the friendly name and |
| adding it to the internal maps. Internal use only. |
| |
| Args: |
| identifier (str): The name of the #define identifier. ie AID_FOO. |
| value (str): The value associated with the identifier. |
| |
| Raises: |
| ValueError: With message set to indicate the error. |
| """ |
| |
| aid = AID(identifier, value, self._aid_header, '/system/bin/sh') |
| |
| # duplicate name |
| if aid.friendly in self._aid_name_to_value: |
| raise ValueError('Duplicate aid "%s"' % identifier) |
| |
| if value in self._aid_value_to_name and aid.identifier not in AIDHeaderParser._COLLISION_OK: |
| raise ValueError( |
| 'Duplicate aid value "%s" for %s' % (value, identifier)) |
| |
| self._aid_name_to_value[aid.friendly] = aid |
| self._aid_value_to_name[value] = aid.friendly |
| |
| def _handle_oem_range(self, identifier, value): |
| """Handle an OEM range C #define. |
| |
| When encountering special AID defines, notably for the OEM ranges |
| this method handles sanity checking and adding them to the internal |
| maps. For internal use only. |
| |
| Args: |
| identifier (str): The name of the #define identifier. |
| ie AID_OEM_RESERVED_START/END. |
| value (str): The value associated with the identifier. |
| |
| Raises: |
| ValueError: With message set to indicate the error. |
| """ |
| |
| try: |
| int_value = int(value, 0) |
| except ValueError: |
| raise ValueError( |
| 'Could not convert "%s" to integer value, got: "%s"' % |
| (identifier, value)) |
| |
| # convert AID_OEM_RESERVED_START or AID_OEM_RESERVED_<num>_START |
| # to AID_OEM_RESERVED or AID_OEM_RESERVED_<num> |
| is_start = identifier.endswith(AIDHeaderParser._OEM_START_KW) |
| |
| if is_start: |
| tostrip = len(AIDHeaderParser._OEM_START_KW) |
| else: |
| tostrip = len(AIDHeaderParser._OEM_END_KW) |
| |
| # ending _ |
| tostrip = tostrip + 1 |
| |
| strip = identifier[:-tostrip] |
| if strip not in self._oem_ranges: |
| self._oem_ranges[strip] = [] |
| |
| if len(self._oem_ranges[strip]) > 2: |
| raise ValueError('Too many same OEM Ranges "%s"' % identifier) |
| |
| if len(self._oem_ranges[strip]) == 1: |
| tmp = self._oem_ranges[strip][0] |
| |
| if tmp == int_value: |
| raise ValueError('START and END values equal %u' % int_value) |
| elif is_start and tmp < int_value: |
| raise ValueError( |
| 'END value %u less than START value %u' % (tmp, int_value)) |
| elif not is_start and tmp > int_value: |
| raise ValueError( |
| 'END value %u less than START value %u' % (int_value, tmp)) |
| |
| # Add START values to the head of the list and END values at the end. |
| # Thus, the list is ordered with index 0 as START and index 1 as END. |
| if is_start: |
| self._oem_ranges[strip].insert(0, int_value) |
| else: |
| self._oem_ranges[strip].append(int_value) |
| |
| def _process_and_check(self): |
| """Process, check and populate internal data structures. |
| |
| After parsing and generating the internal data structures, this method |
| is responsible for sanity checking ALL of the acquired data. |
| |
| Raises: |
| ValueError: With the message set to indicate the specific error. |
| """ |
| |
| # tuplefy the lists since range() does not like them mutable. |
| self._oem_ranges = [ |
| AIDHeaderParser._convert_lst_to_tup(k, v) |
| for k, v in self._oem_ranges.iteritems() |
| ] |
| |
| # Check for overlapping ranges |
| for i, range1 in enumerate(self._oem_ranges): |
| for range2 in self._oem_ranges[i + 1:]: |
| if AIDHeaderParser._is_overlap(range1, range2): |
| raise ValueError("Overlapping OEM Ranges found %s and %s" % |
| (str(range1), str(range2))) |
| |
| # No core AIDs should be within any oem range. |
| for aid in self._aid_value_to_name: |
| |
| if Utils.in_any_range(aid, self._oem_ranges): |
| name = self._aid_value_to_name[aid] |
| raise ValueError( |
| 'AID "%s" value: %u within reserved OEM Range: "%s"' % |
| (name, aid, str(self._oem_ranges))) |
| |
| @property |
| def oem_ranges(self): |
| """Retrieves the OEM closed ranges as a list of tuples. |
| |
| Returns: |
| A list of closed range tuples: [ (0, 42), (50, 105) ... ] |
| """ |
| return self._oem_ranges |
| |
| @property |
| def aids(self): |
| """Retrieves the list of found AIDs. |
| |
| Returns: |
| A list of AID() objects. |
| """ |
| return self._aid_name_to_value.values() |
| |
| @staticmethod |
| def _convert_lst_to_tup(name, lst): |
| """Converts a mutable list to a non-mutable tuple. |
| |
| Used ONLY for ranges and thus enforces a length of 2. |
| |
| Args: |
| lst (List): list that should be "tuplefied". |
| |
| Raises: |
| ValueError if lst is not a list or len is not 2. |
| |
| Returns: |
| Tuple(lst) |
| """ |
| if not lst or len(lst) != 2: |
| raise ValueError('Mismatched range for "%s"' % name) |
| |
| return tuple(lst) |
| |
| @staticmethod |
| def _is_oem_range(aid): |
| """Detects if a given aid is within the reserved OEM range. |
| |
| Args: |
| aid (int): The aid to test |
| |
| Returns: |
| True if it is within the range, False otherwise. |
| """ |
| |
| return AIDHeaderParser._OEM_RANGE.match(aid) |
| |
| @staticmethod |
| def _is_overlap(range_a, range_b): |
| """Calculates the overlap of two range tuples. |
| |
| A range tuple is a closed range. A closed range includes its endpoints. |
| Note that python tuples use () notation which collides with the |
| mathematical notation for open ranges. |
| |
| Args: |
| range_a: The first tuple closed range eg (0, 5). |
| range_b: The second tuple closed range eg (3, 7). |
| |
| Returns: |
| True if they overlap, False otherwise. |
| """ |
| |
| return max(range_a[0], range_b[0]) <= min(range_a[1], range_b[1]) |
| |
| |
| class FSConfigFileParser(object): |
| """Parses a config.fs ini format file. |
| |
| This class is responsible for parsing the config.fs ini format files. |
| It collects and checks all the data in these files and makes it available |
| for consumption post processed. |
| """ |
| |
| # These _AID vars work together to ensure that an AID section name |
| # cannot contain invalid characters for a C define or a passwd/group file. |
| # Since _AID_PREFIX is within the set of _AID_MATCH the error logic only |
| # checks end, if you change this, you may have to update the error |
| # detection code. |
| _AID_MATCH = re.compile('%s[A-Z0-9_]+' % AID.PREFIX) |
| _AID_ERR_MSG = 'Expecting upper case, a number or underscore' |
| |
| # list of handler to required options, used to identify the |
| # parsing section |
| _SECTIONS = [('_handle_aid', ('value', )), |
| ('_handle_path', ('mode', 'user', 'group', 'caps'))] |
| |
| def __init__(self, config_files, oem_ranges): |
| """ |
| Args: |
| config_files ([str]): The list of config.fs files to parse. |
| Note the filename is not important. |
| oem_ranges ([(),()]): range tuples indicating reserved OEM ranges. |
| """ |
| |
| self._files = [] |
| self._dirs = [] |
| self._aids = [] |
| |
| self._seen_paths = {} |
| # (name to file, value to aid) |
| self._seen_aids = ({}, {}) |
| |
| self._oem_ranges = oem_ranges |
| |
| self._config_files = config_files |
| |
| for config_file in self._config_files: |
| self._parse(config_file) |
| |
| def _parse(self, file_name): |
| """Parses and verifies config.fs files. Internal use only. |
| |
| Args: |
| file_name (str): The config.fs (PythonConfigParser file format) |
| file to parse. |
| |
| Raises: |
| Anything raised by ConfigParser.read() |
| """ |
| |
| # Separate config parsers for each file found. If you use |
| # read(filenames...) later files can override earlier files which is |
| # not what we want. Track state across files and enforce with |
| # _handle_dup(). Note, strict ConfigParser is set to true in |
| # Python >= 3.2, so in previous versions same file sections can |
| # override previous |
| # sections. |
| |
| config = ConfigParser.ConfigParser() |
| config.read(file_name) |
| |
| for section in config.sections(): |
| |
| found = False |
| |
| for test in FSConfigFileParser._SECTIONS: |
| handler = test[0] |
| options = test[1] |
| |
| if all([config.has_option(section, item) for item in options]): |
| handler = getattr(self, handler) |
| handler(file_name, section, config) |
| found = True |
| break |
| |
| if not found: |
| sys.exit('Invalid section "%s" in file: "%s"' % (section, |
| file_name)) |
| |
| # sort entries: |
| # * specified path before prefix match |
| # ** ie foo before f* |
| # * lexicographical less than before other |
| # ** ie boo before foo |
| # Given these paths: |
| # paths=['ac', 'a', 'acd', 'an', 'a*', 'aa', 'ac*'] |
| # The sort order would be: |
| # paths=['a', 'aa', 'ac', 'acd', 'an', 'ac*', 'a*'] |
| # Thus the fs_config tools will match on specified paths before |
| # attempting prefix, and match on the longest matching prefix. |
| self._files.sort(key=FSConfigFileParser._file_key) |
| |
| # sort on value of (file_name, name, value, strvalue) |
| # This is only cosmetic so AIDS are arranged in ascending order |
| # within the generated file. |
| self._aids.sort(key=lambda item: item.normalized_value) |
| |
| def _handle_aid(self, file_name, section_name, config): |
| """Verifies an AID entry and adds it to the aid list. |
| |
| Calls sys.exit() with a descriptive message of the failure. |
| |
| Args: |
| file_name (str): The filename of the config file being parsed. |
| section_name (str): The section name currently being parsed. |
| config (ConfigParser): The ConfigParser section being parsed that |
| the option values will come from. |
| """ |
| |
| def error_message(msg): |
| """Creates an error message with current parsing state.""" |
| return '{} for: "{}" file: "{}"'.format(msg, section_name, |
| file_name) |
| |
| FSConfigFileParser._handle_dup_and_add('AID', file_name, section_name, |
| self._seen_aids[0]) |
| |
| match = FSConfigFileParser._AID_MATCH.match(section_name) |
| invalid = match.end() if match else len(AID.PREFIX) |
| if invalid != len(section_name): |
| tmp_errmsg = ('Invalid characters in AID section at "%d" for: "%s"' |
| % (invalid, FSConfigFileParser._AID_ERR_MSG)) |
| sys.exit(error_message(tmp_errmsg)) |
| |
| value = config.get(section_name, 'value') |
| |
| if not value: |
| sys.exit(error_message('Found specified but unset "value"')) |
| |
| try: |
| aid = AID(section_name, value, file_name, '/vendor/bin/sh') |
| except ValueError as exception: |
| sys.exit(error_message(exception)) |
| |
| # Values must be within OEM range |
| if not Utils.in_any_range(int(aid.value, 0), self._oem_ranges): |
| emsg = '"value" not in valid range %s, got: %s' |
| emsg = emsg % (str(self._oem_ranges), value) |
| sys.exit(error_message(emsg)) |
| |
| # use the normalized int value in the dict and detect |
| # duplicate definitions of the same value |
| FSConfigFileParser._handle_dup_and_add( |
| 'AID', file_name, aid.normalized_value, self._seen_aids[1]) |
| |
| # Append aid tuple of (AID_*, base10(value), _path(value)) |
| # We keep the _path version of value so we can print that out in the |
| # generated header so investigating parties can identify parts. |
| # We store the base10 value for sorting, so everything is ascending |
| # later. |
| self._aids.append(aid) |
| |
| def _handle_path(self, file_name, section_name, config): |
| """Add a file capability entry to the internal list. |
| |
| Handles a file capability entry, verifies it, and adds it to |
| to the internal dirs or files list based on path. If it ends |
| with a / its a dir. Internal use only. |
| |
| Calls sys.exit() on any validation error with message set. |
| |
| Args: |
| file_name (str): The current name of the file being parsed. |
| section_name (str): The name of the section to parse. |
| config (str): The config parser. |
| """ |
| |
| FSConfigFileParser._handle_dup_and_add('path', file_name, section_name, |
| self._seen_paths) |
| |
| mode = config.get(section_name, 'mode') |
| user = config.get(section_name, 'user') |
| group = config.get(section_name, 'group') |
| caps = config.get(section_name, 'caps') |
| |
| errmsg = ('Found specified but unset option: \"%s" in file: \"' + |
| file_name + '\"') |
| |
| if not mode: |
| sys.exit(errmsg % 'mode') |
| |
| if not user: |
| sys.exit(errmsg % 'user') |
| |
| if not group: |
| sys.exit(errmsg % 'group') |
| |
| if not caps: |
| sys.exit(errmsg % 'caps') |
| |
| caps = caps.split() |
| |
| tmp = [] |
| for cap in caps: |
| try: |
| # test if string is int, if it is, use as is. |
| int(cap, 0) |
| tmp.append(cap) |
| except ValueError: |
| tmp.append('CAP_' + cap.upper()) |
| |
| caps = tmp |
| |
| if len(mode) == 3: |
| mode = '0' + mode |
| |
| try: |
| int(mode, 8) |
| except ValueError: |
| sys.exit('Mode must be octal characters, got: "%s"' % mode) |
| |
| if len(mode) != 4: |
| sys.exit('Mode must be 3 or 4 characters, got: "%s"' % mode) |
| |
| caps_str = ','.join(caps) |
| |
| entry = FSConfig(mode, user, group, caps_str, section_name, file_name) |
| if section_name[-1] == '/': |
| self._dirs.append(entry) |
| else: |
| self._files.append(entry) |
| |
| @property |
| def files(self): |
| """Get the list of FSConfig file entries. |
| |
| Returns: |
| a list of FSConfig() objects for file paths. |
| """ |
| return self._files |
| |
| @property |
| def dirs(self): |
| """Get the list of FSConfig dir entries. |
| |
| Returns: |
| a list of FSConfig() objects for directory paths. |
| """ |
| return self._dirs |
| |
| @property |
| def aids(self): |
| """Get the list of AID entries. |
| |
| Returns: |
| a list of AID() objects. |
| """ |
| return self._aids |
| |
| @staticmethod |
| def _file_key(fs_config): |
| """Used as the key paramter to sort. |
| |
| This is used as a the function to the key parameter of a sort. |
| it wraps the string supplied in a class that implements the |
| appropriate __lt__ operator for the sort on path strings. See |
| StringWrapper class for more details. |
| |
| Args: |
| fs_config (FSConfig): A FSConfig entry. |
| |
| Returns: |
| A StringWrapper object |
| """ |
| |
| # Wrapper class for custom prefix matching strings |
| class StringWrapper(object): |
| """Wrapper class used for sorting prefix strings. |
| |
| The algorithm is as follows: |
| - specified path before prefix match |
| - ie foo before f* |
| - lexicographical less than before other |
| - ie boo before foo |
| |
| Given these paths: |
| paths=['ac', 'a', 'acd', 'an', 'a*', 'aa', 'ac*'] |
| The sort order would be: |
| paths=['a', 'aa', 'ac', 'acd', 'an', 'ac*', 'a*'] |
| Thus the fs_config tools will match on specified paths before |
| attempting prefix, and match on the longest matching prefix. |
| """ |
| |
| def __init__(self, path): |
| """ |
| Args: |
| path (str): the path string to wrap. |
| """ |
| self.is_prefix = path[-1] == '*' |
| if self.is_prefix: |
| self.path = path[:-1] |
| else: |
| self.path = path |
| |
| def __lt__(self, other): |
| |
| # if were both suffixed the smallest string |
| # is 'bigger' |
| if self.is_prefix and other.is_prefix: |
| result = len(self.path) > len(other.path) |
| # If I am an the suffix match, im bigger |
| elif self.is_prefix: |
| result = False |
| # If other is the suffix match, he's bigger |
| elif other.is_prefix: |
| result = True |
| # Alphabetical |
| else: |
| result = self.path < other.path |
| return result |
| |
| return StringWrapper(fs_config.path) |
| |
| @staticmethod |
| def _handle_dup_and_add(name, file_name, section_name, seen): |
| """Tracks and detects duplicates. Internal use only. |
| |
| Calls sys.exit() on a duplicate. |
| |
| Args: |
| name (str): The name to use in the error reporting. The pretty |
| name for the section. |
| file_name (str): The file currently being parsed. |
| section_name (str): The name of the section. This would be path |
| or identifier depending on what's being parsed. |
| seen (dict): The dictionary of seen things to check against. |
| """ |
| if section_name in seen: |
| dups = '"' + seen[section_name] + '" and ' |
| dups += file_name |
| sys.exit('Duplicate %s "%s" found in files: %s' % |
| (name, section_name, dups)) |
| |
| seen[section_name] = file_name |
| |
| |
| class BaseGenerator(object): |
| """Interface for Generators. |
| |
| Base class for generators, generators should implement |
| these method stubs. |
| """ |
| |
| def add_opts(self, opt_group): |
| """Used to add per-generator options to the command line. |
| |
| Args: |
| opt_group (argument group object): The argument group to append to. |
| See the ArgParse docs for more details. |
| """ |
| |
| raise NotImplementedError("Not Implemented") |
| |
| def __call__(self, args): |
| """This is called to do whatever magic the generator does. |
| |
| Args: |
| args (dict): The arguments from ArgParse as a dictionary. |
| ie if you specified an argument of foo in add_opts, access |
| it via args['foo'] |
| """ |
| |
| raise NotImplementedError("Not Implemented") |
| |
| |
| @generator('fsconfig') |
| class FSConfigGen(BaseGenerator): |
| """Generates the android_filesystem_config.h file. |
| |
| Output is used in generating fs_config_files and fs_config_dirs. |
| """ |
| |
| def __init__(self, *args, **kwargs): |
| BaseGenerator.__init__(args, kwargs) |
| |
| self._oem_parser = None |
| self._base_parser = None |
| self._friendly_to_aid = None |
| self._id_to_aid = None |
| self._capability_parser = None |
| |
| self._partition = None |
| self._all_partitions = None |
| self._out_file = None |
| self._generate_files = False |
| self._generate_dirs = False |
| |
| def add_opts(self, opt_group): |
| |
| opt_group.add_argument( |
| 'fsconfig', nargs='+', help='The list of fsconfig files to parse') |
| |
| opt_group.add_argument( |
| '--aid-header', |
| required=True, |
| help='An android_filesystem_config.h file' |
| ' to parse AIDs and OEM Ranges from') |
| |
| opt_group.add_argument( |
| '--capability-header', |
| required=True, |
| help='A capability.h file to parse capability defines from') |
| |
| opt_group.add_argument( |
| '--partition', |
| required=True, |
| help='Partition to generate contents for') |
| |
| opt_group.add_argument( |
| '--all-partitions', |
| help='Comma separated list of all possible partitions, used to' |
| ' ignore these partitions when generating the output for the system partition' |
| ) |
| |
| opt_group.add_argument( |
| '--files', action='store_true', help='Output fs_config_files') |
| |
| opt_group.add_argument( |
| '--dirs', action='store_true', help='Output fs_config_dirs') |
| |
| opt_group.add_argument('--out_file', required=True, help='Output file') |
| |
| def __call__(self, args): |
| |
| self._capability_parser = CapabilityHeaderParser( |
| args['capability_header']) |
| self._base_parser = AIDHeaderParser(args['aid_header']) |
| self._oem_parser = FSConfigFileParser(args['fsconfig'], |
| self._base_parser.oem_ranges) |
| |
| self._partition = args['partition'] |
| self._all_partitions = args['all_partitions'] |
| if self._partition == 'system' and self._all_partitions is None: |
| sys.exit( |
| 'All other partitions must be provided if generating output' |
| ' for the system partition') |
| |
| self._out_file = args['out_file'] |
| |
| self._generate_files = args['files'] |
| self._generate_dirs = args['dirs'] |
| |
| if self._generate_files and self._generate_dirs: |
| sys.exit('Only one of --files or --dirs can be provided') |
| |
| if not self._generate_files and not self._generate_dirs: |
| sys.exit('One of --files or --dirs must be provided') |
| |
| base_aids = self._base_parser.aids |
| oem_aids = self._oem_parser.aids |
| |
| # Detect name collisions on AIDs. Since friendly works as the |
| # identifier for collision testing and we need friendly later on for |
| # name resolution, just calculate and use friendly. |
| # {aid.friendly: aid for aid in base_aids} |
| base_friendly = {aid.friendly: aid for aid in base_aids} |
| oem_friendly = {aid.friendly: aid for aid in oem_aids} |
| |
| base_set = set(base_friendly.keys()) |
| oem_set = set(oem_friendly.keys()) |
| |
| common = base_set & oem_set |
| |
| if common: |
| emsg = 'Following AID Collisions detected for: \n' |
| for friendly in common: |
| base = base_friendly[friendly] |
| oem = oem_friendly[friendly] |
| emsg += ( |
| 'Identifier: "%s" Friendly Name: "%s" ' |
| 'found in file "%s" and "%s"' % |
| (base.identifier, base.friendly, base.found, oem.found)) |
| sys.exit(emsg) |
| |
| self._friendly_to_aid = oem_friendly |
| self._friendly_to_aid.update(base_friendly) |
| |
| self._id_to_aid = {aid.identifier: aid for aid in base_aids} |
| self._id_to_aid.update({aid.identifier: aid for aid in oem_aids}) |
| |
| self._generate() |
| |
| def _to_fs_entry(self, fs_config, out_file): |
| """Converts an FSConfig entry to an fs entry. |
| |
| Writes the fs_config contents to the output file. |
| |
| Calls sys.exit() on error. |
| |
| Args: |
| fs_config (FSConfig): The entry to convert to write to file. |
| file (File): The file to write to. |
| """ |
| |
| # Get some short names |
| mode = fs_config.mode |
| user = fs_config.user |
| group = fs_config.group |
| caps = fs_config.caps |
| path = fs_config.path |
| |
| emsg = 'Cannot convert "%s" to identifier!' |
| |
| # convert mode from octal string to integer |
| mode = int(mode, 8) |
| |
| # remap names to values |
| if AID.is_friendly(user): |
| if user not in self._friendly_to_aid: |
| sys.exit(emsg % user) |
| user = self._friendly_to_aid[user].value |
| else: |
| if user not in self._id_to_aid: |
| sys.exit(emsg % user) |
| user = self._id_to_aid[user].value |
| |
| if AID.is_friendly(group): |
| if group not in self._friendly_to_aid: |
| sys.exit(emsg % group) |
| group = self._friendly_to_aid[group].value |
| else: |
| if group not in self._id_to_aid: |
| sys.exit(emsg % group) |
| group = self._id_to_aid[group].value |
| |
| caps_dict = self._capability_parser.caps |
| |
| caps_value = 0 |
| |
| try: |
| # test if caps is an int |
| caps_value = int(caps, 0) |
| except ValueError: |
| caps_split = caps.split(',') |
| for cap in caps_split: |
| if cap not in caps_dict: |
| sys.exit('Unkonwn cap "%s" found!' % cap) |
| caps_value += 1 << caps_dict[cap] |
| |
| path_length_with_null = len(path) + 1 |
| path_length_aligned_64 = (path_length_with_null + 7) & ~7 |
| # 16 bytes of header plus the path length with alignment |
| length = 16 + path_length_aligned_64 |
| |
| length_binary = bytearray(ctypes.c_uint16(length)) |
| mode_binary = bytearray(ctypes.c_uint16(mode)) |
| user_binary = bytearray(ctypes.c_uint16(int(user, 0))) |
| group_binary = bytearray(ctypes.c_uint16(int(group, 0))) |
| caps_binary = bytearray(ctypes.c_uint64(caps_value)) |
| path_binary = ctypes.create_string_buffer(path, |
| path_length_aligned_64).raw |
| |
| out_file.write(length_binary) |
| out_file.write(mode_binary) |
| out_file.write(user_binary) |
| out_file.write(group_binary) |
| out_file.write(caps_binary) |
| out_file.write(path_binary) |
| |
| def _emit_entry(self, fs_config): |
| """Returns a boolean whether or not to emit the input fs_config""" |
| |
| path = fs_config.path |
| |
| if self._partition == 'system': |
| for skip_partition in self._all_partitions.split(','): |
| if path.startswith(skip_partition) or path.startswith( |
| 'system/' + skip_partition): |
| return False |
| return True |
| else: |
| if path.startswith( |
| self._partition) or path.startswith('system/' + |
| self._partition): |
| return True |
| return False |
| |
| def _generate(self): |
| """Generates an OEM android_filesystem_config.h header file to stdout. |
| |
| Args: |
| files ([FSConfig]): A list of FSConfig objects for file entries. |
| dirs ([FSConfig]): A list of FSConfig objects for directory |
| entries. |
| aids ([AIDS]): A list of AID objects for Android Id entries. |
| """ |
| dirs = self._oem_parser.dirs |
| files = self._oem_parser.files |
| |
| if self._generate_files: |
| with open(self._out_file, 'wb') as open_file: |
| for fs_config in files: |
| if self._emit_entry(fs_config): |
| self._to_fs_entry(fs_config, open_file) |
| |
| if self._generate_dirs: |
| with open(self._out_file, 'wb') as open_file: |
| for dir_entry in dirs: |
| if self._emit_entry(dir_entry): |
| self._to_fs_entry(dir_entry, open_file) |
| |
| |
| @generator('aidarray') |
| class AIDArrayGen(BaseGenerator): |
| """Generates the android_id static array.""" |
| |
| _GENERATED = ('/*\n' |
| ' * THIS IS AN AUTOGENERATED FILE! DO NOT MODIFY!\n' |
| ' */') |
| |
| _INCLUDE = '#include <private/android_filesystem_config.h>' |
| |
| # Note that the android_id name field is of type 'const char[]' instead of |
| # 'const char*'. While this seems less straightforward as we need to |
| # calculate the max length of all names, this allows the entire android_ids |
| # table to be placed in .rodata section instead of .data.rel.ro section, |
| # resulting in less memory pressure. |
| _STRUCT_FS_CONFIG = textwrap.dedent(""" |
| struct android_id_info { |
| const char name[%d]; |
| unsigned aid; |
| };""") |
| |
| _OPEN_ID_ARRAY = 'static const struct android_id_info android_ids[] = {' |
| |
| _ID_ENTRY = ' { "%s", %s },' |
| |
| _CLOSE_FILE_STRUCT = '};' |
| |
| _COUNT = ('#define android_id_count \\\n' |
| ' (sizeof(android_ids) / sizeof(android_ids[0]))') |
| |
| def add_opts(self, opt_group): |
| |
| opt_group.add_argument( |
| 'hdrfile', help='The android_filesystem_config.h' |
| 'file to parse') |
| |
| def __call__(self, args): |
| |
| hdr = AIDHeaderParser(args['hdrfile']) |
| max_name_length = max(len(aid.friendly) + 1 for aid in hdr.aids) |
| |
| print AIDArrayGen._GENERATED |
| print |
| print AIDArrayGen._INCLUDE |
| print |
| print AIDArrayGen._STRUCT_FS_CONFIG % max_name_length |
| print |
| print AIDArrayGen._OPEN_ID_ARRAY |
| |
| for aid in hdr.aids: |
| print AIDArrayGen._ID_ENTRY % (aid.friendly, aid.identifier) |
| |
| print AIDArrayGen._CLOSE_FILE_STRUCT |
| print |
| print AIDArrayGen._COUNT |
| print |
| |
| |
| @generator('oemaid') |
| class OEMAidGen(BaseGenerator): |
| """Generates the OEM AID_<name> value header file.""" |
| |
| _GENERATED = ('/*\n' |
| ' * THIS IS AN AUTOGENERATED FILE! DO NOT MODIFY!\n' |
| ' */') |
| |
| _GENERIC_DEFINE = "#define %s\t%s" |
| |
| _FILE_COMMENT = '// Defined in file: \"%s\"' |
| |
| # Intentional trailing newline for readability. |
| _FILE_IFNDEF_DEFINE = ('#ifndef GENERATED_OEM_AIDS_H_\n' |
| '#define GENERATED_OEM_AIDS_H_\n') |
| |
| _FILE_ENDIF = '#endif' |
| |
| def __init__(self): |
| |
| self._old_file = None |
| |
| def add_opts(self, opt_group): |
| |
| opt_group.add_argument( |
| 'fsconfig', nargs='+', help='The list of fsconfig files to parse.') |
| |
| opt_group.add_argument( |
| '--aid-header', |
| required=True, |
| help='An android_filesystem_config.h file' |
| 'to parse AIDs and OEM Ranges from') |
| |
| def __call__(self, args): |
| |
| hdr_parser = AIDHeaderParser(args['aid_header']) |
| |
| parser = FSConfigFileParser(args['fsconfig'], hdr_parser.oem_ranges) |
| |
| print OEMAidGen._GENERATED |
| |
| print OEMAidGen._FILE_IFNDEF_DEFINE |
| |
| for aid in parser.aids: |
| self._print_aid(aid) |
| print |
| |
| print OEMAidGen._FILE_ENDIF |
| |
| def _print_aid(self, aid): |
| """Prints a valid #define AID identifier to stdout. |
| |
| Args: |
| aid to print |
| """ |
| |
| # print the source file location of the AID |
| found_file = aid.found |
| if found_file != self._old_file: |
| print OEMAidGen._FILE_COMMENT % found_file |
| self._old_file = found_file |
| |
| print OEMAidGen._GENERIC_DEFINE % (aid.identifier, aid.value) |
| |
| |
| @generator('passwd') |
| class PasswdGen(BaseGenerator): |
| """Generates the /etc/passwd file per man (5) passwd.""" |
| |
| def __init__(self): |
| |
| self._old_file = None |
| |
| def add_opts(self, opt_group): |
| |
| opt_group.add_argument( |
| 'fsconfig', nargs='+', help='The list of fsconfig files to parse.') |
| |
| opt_group.add_argument( |
| '--aid-header', |
| required=True, |
| help='An android_filesystem_config.h file' |
| 'to parse AIDs and OEM Ranges from') |
| |
| opt_group.add_argument( |
| '--required-prefix', |
| required=False, |
| help='A prefix that the names are required to contain.') |
| |
| def __call__(self, args): |
| |
| hdr_parser = AIDHeaderParser(args['aid_header']) |
| |
| parser = FSConfigFileParser(args['fsconfig'], hdr_parser.oem_ranges) |
| |
| required_prefix = args['required_prefix'] |
| |
| aids = parser.aids |
| |
| # nothing to do if no aids defined |
| if not aids: |
| return |
| |
| for aid in aids: |
| if required_prefix is None or aid.friendly.startswith( |
| required_prefix): |
| self._print_formatted_line(aid) |
| else: |
| sys.exit("%s: AID '%s' must start with '%s'" % |
| (args['fsconfig'], aid.friendly, required_prefix)) |
| |
| def _print_formatted_line(self, aid): |
| """Prints the aid to stdout in the passwd format. Internal use only. |
| |
| Colon delimited: |
| login name, friendly name |
| encrypted password (optional) |
| uid (int) |
| gid (int) |
| User name or comment field |
| home directory |
| interpreter (optional) |
| |
| Args: |
| aid (AID): The aid to print. |
| """ |
| if self._old_file != aid.found: |
| self._old_file = aid.found |
| |
| try: |
| logon, uid = Utils.get_login_and_uid_cleansed(aid) |
| except ValueError as exception: |
| sys.exit(exception) |
| |
| print "%s::%s:%s::/:%s" % (logon, uid, uid, aid.login_shell) |
| |
| |
| @generator('group') |
| class GroupGen(PasswdGen): |
| """Generates the /etc/group file per man (5) group.""" |
| |
| # Overrides parent |
| def _print_formatted_line(self, aid): |
| """Prints the aid to stdout in the group format. Internal use only. |
| |
| Formatted (per man 5 group) like: |
| group_name:password:GID:user_list |
| |
| Args: |
| aid (AID): The aid to print. |
| """ |
| if self._old_file != aid.found: |
| self._old_file = aid.found |
| |
| try: |
| logon, uid = Utils.get_login_and_uid_cleansed(aid) |
| except ValueError as exception: |
| sys.exit(exception) |
| |
| print "%s::%s:" % (logon, uid) |
| |
| |
| @generator('print') |
| class PrintGen(BaseGenerator): |
| """Prints just the constants and values, separated by spaces, in an easy to |
| parse format for use by other scripts. |
| |
| Each line is just the identifier and the value, separated by a space. |
| """ |
| |
| def add_opts(self, opt_group): |
| opt_group.add_argument( |
| 'aid-header', help='An android_filesystem_config.h file.') |
| |
| def __call__(self, args): |
| |
| hdr_parser = AIDHeaderParser(args['aid-header']) |
| aids = hdr_parser.aids |
| |
| aids.sort(key=lambda item: int(item.normalized_value)) |
| |
| for aid in aids: |
| print '%s %s' % (aid.identifier, aid.normalized_value) |
| |
| |
| def main(): |
| """Main entry point for execution.""" |
| |
| opt_parser = argparse.ArgumentParser( |
| description='A tool for parsing fsconfig config files and producing' + |
| 'digestable outputs.') |
| subparser = opt_parser.add_subparsers(help='generators') |
| |
| gens = generator.get() |
| |
| # for each gen, instantiate and add them as an option |
| for name, gen in gens.iteritems(): |
| |
| generator_option_parser = subparser.add_parser(name, help=gen.__doc__) |
| generator_option_parser.set_defaults(which=name) |
| |
| opt_group = generator_option_parser.add_argument_group(name + |
| ' options') |
| gen.add_opts(opt_group) |
| |
| args = opt_parser.parse_args() |
| |
| args_as_dict = vars(args) |
| which = args_as_dict['which'] |
| del args_as_dict['which'] |
| |
| gens[which](args_as_dict) |
| |
| |
| if __name__ == '__main__': |
| main() |
