Current File : //usr/lib/python3.6/site-packages/firewall/core/io/ifcfg.py
# -*- coding: utf-8 -*-
#
# Copyright (C) 2011-2016 Red Hat, Inc.
#
# Authors:
# Thomas Woerner <twoerner@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
"""ifcfg file parser"""
__all__ = [ "ifcfg" ]
import os.path
import io
import tempfile
import shutil
from firewall.core.logger import log
from firewall.functions import b2u, u2b, PY2
class ifcfg(object):
def __init__(self, filename):
self._config = { }
self._deleted = [ ]
self.filename = filename
self.clear()
def clear(self):
self._config = { }
self._deleted = [ ]
def cleanup(self):
self._config.clear()
def get(self, key):
return self._config.get(key.strip())
def set(self, key, value):
_key = b2u(key.strip())
self._config[_key] = b2u(value.strip())
if _key in self._deleted:
self._deleted.remove(_key)
def __str__(self):
s = ""
for (key, value) in self._config.items():
if s:
s += '\n'
s += '%s=%s' % (key, value)
return u2b(s) if PY2 else s
# load self.filename
def read(self):
self.clear()
try:
f = open(self.filename, "r")
except Exception as msg:
log.error("Failed to load '%s': %s", self.filename, msg)
raise
for line in f:
if not line:
break
line = line.strip()
if len(line) < 1 or line[0] in ['#', ';']:
continue
# get key/value pair
pair = [ x.strip() for x in line.split("=", 1) ]
if len(pair) != 2:
continue
if len(pair[1]) >= 2 and \
pair[1].startswith('"') and pair[1].endswith('"'):
pair[1] = pair[1][1:-1]
if pair[1] == '':
continue
elif self._config.get(pair[0]) is not None:
log.warning("%s: Duplicate option definition: '%s'", self.filename, line.strip())
continue
self._config[pair[0]] = pair[1]
f.close()
def write(self):
if len(self._config) < 1:
# no changes: nothing to do
return
# handled keys
done = [ ]
try:
temp_file = tempfile.NamedTemporaryFile(
mode='wt',
prefix="%s." % os.path.basename(self.filename),
dir=os.path.dirname(self.filename), delete=False)
except Exception as msg:
log.error("Failed to open temporary file: %s" % msg)
raise
modified = False
empty = False
try:
f = io.open(self.filename, mode='rt', encoding='UTF-8')
except Exception as msg:
if os.path.exists(self.filename):
log.error("Failed to open '%s': %s" % (self.filename, msg))
raise
else:
f = None
else:
for line in f:
if not line:
break
# remove newline
line = line.strip("\n")
if len(line) < 1:
if not empty:
temp_file.write(u"\n")
empty = True
elif line[0] == '#':
empty = False
temp_file.write(line)
temp_file.write(u"\n")
else:
p = line.split("=", 1)
if len(p) != 2:
empty = False
temp_file.write(line+u"\n")
continue
key = p[0].strip()
value = p[1].strip()
if len(value) >= 2 and \
value.startswith('"') and value.endswith('"'):
value = value[1:-1]
# check for modified key/value pairs
if key not in done:
if key in self._config and self._config[key] != value:
empty = False
temp_file.write(u'%s=%s\n' % (key,
self._config[key]))
modified = True
elif key in self._deleted:
modified = True
else:
empty = False
temp_file.write(line+u"\n")
done.append(key)
else:
modified = True
# write remaining key/value pairs
if len(self._config) > 0:
for (key, value) in self._config.items():
if key in done:
continue
if not empty:
empty = True
temp_file.write(u'%s=%s\n' % (key, value))
modified = True
if f:
f.close()
temp_file.close()
if not modified: # not modified: remove tempfile
os.remove(temp_file.name)
return
# make backup
if os.path.exists(self.filename):
try:
shutil.copy2(self.filename, "%s.bak" % self.filename)
except Exception as msg:
os.remove(temp_file.name)
raise IOError("Backup of '%s' failed: %s" % (self.filename, msg))
# copy tempfile
try:
shutil.move(temp_file.name, self.filename)
except Exception as msg:
os.remove(temp_file.name)
raise IOError("Failed to create '%s': %s" % (self.filename, msg))
else:
os.chmod(self.filename, 0o600)
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