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1# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com>
2#
3# Copyright (C) 2006 Red Hat
4# see file 'COPYING' for use and warranty information
5#
6# This program is free software; you can redistribute it and/or
7# modify it under the terms of the GNU General Public License as
8# published by the Free Software Foundation; version 2 only
9#
10# This program is distributed in the hope that it will be useful,
11# but WITHOUT ANY WARRANTY; without even the implied warranty of
12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13# GNU General Public License for more details.
14#
15# You should have received a copy of the GNU General Public License
16# along with this program; if not, write to the Free Software
17# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18#
19
20import os
21import re
22
23# Select the correct location for the development files based on a
24# path variable (optionally read from a configuration file)
25class PathChooser(object):
26    def __init__(self, pathname):
27        self.config = dict()
28        if not os.path.exists(pathname):
29            self.config_pathname = "(defaults)"
30            self.config["SELINUX_DEVEL_PATH"] = "/usr/share/selinux/default:/usr/share/selinux/mls:/usr/share/selinux/devel"
31            return
32        self.config_pathname = pathname
33        ignore = re.compile(r"^\s*(?:#.+)?$")
34        consider = re.compile(r"^\s*(\w+)\s*=\s*(.+?)\s*$")
35        with open(pathname, "r") as fd:
36            for lineno, line in enumerate(fd):
37                if ignore.match(line): continue
38                mo = consider.match(line)
39                if not mo:
40                    raise ValueError("%s:%d: line is not in key = value format" % (pathname, lineno+1))
41                self.config[mo.group(1)] = mo.group(2)
42
43    # We're only exporting one useful function, so why not be a function
44    def __call__(self, testfilename, pathset="SELINUX_DEVEL_PATH"):
45        paths = self.config.get(pathset, None)
46        if paths is None:
47            raise ValueError("%s was not in %s" % (pathset, self.config_pathname))
48        paths = paths.split(":")
49        for p in paths:
50            target = os.path.join(p, testfilename)
51            if os.path.exists(target): return target
52        return os.path.join(paths[0], testfilename)
53
54
55"""
56Various default settings, including file and directory locations.
57"""
58
59def data_dir():
60    return "/var/lib/sepolgen"
61
62def perm_map():
63    return data_dir() + "/perm_map"
64
65def interface_info():
66    return data_dir() + "/interface_info"
67
68def attribute_info():
69    return data_dir() + "/attribute_info"
70
71def refpolicy_makefile():
72    chooser = PathChooser("/etc/selinux/sepolgen.conf")
73    result = chooser("Makefile")
74    if not os.path.exists(result):
75        result = chooser("include/Makefile")
76    return result
77
78def headers():
79    chooser = PathChooser("/etc/selinux/sepolgen.conf")
80    return chooser("include")
81
82