ecc0e7a9de
Bug #1020184 quantum/* Change-Id: I771e0f0d6121b7c03cecd82583e9a6c1915f891d
159 lines
5.9 KiB
Python
159 lines
5.9 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
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# Copyright (c) 2012 OpenStack Foundation.
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# All Rights Reserved.
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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. You may obtain
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# 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. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import ConfigParser
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import logging
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import logging.handlers
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import os
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import string
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from quantum.rootwrap import filters
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class NoFilterMatched(Exception):
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"""This exception is raised when no filter matched."""
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pass
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class FilterMatchNotExecutable(Exception):
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"""Raised when a filter matched but no executable was found."""
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def __init__(self, match=None, **kwargs):
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self.match = match
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class RootwrapConfig(object):
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def __init__(self, config):
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# filters_path
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self.filters_path = config.get("DEFAULT", "filters_path").split(",")
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# exec_dirs
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if config.has_option("DEFAULT", "exec_dirs"):
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self.exec_dirs = config.get("DEFAULT", "exec_dirs").split(",")
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else:
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# Use system PATH if exec_dirs is not specified
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self.exec_dirs = os.environ["PATH"].split(':')
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# syslog_log_facility
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if config.has_option("DEFAULT", "syslog_log_facility"):
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v = config.get("DEFAULT", "syslog_log_facility")
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facility_names = logging.handlers.SysLogHandler.facility_names
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self.syslog_log_facility = getattr(logging.handlers.SysLogHandler,
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v, None)
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if self.syslog_log_facility is None and v in facility_names:
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self.syslog_log_facility = facility_names.get(v)
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if self.syslog_log_facility is None:
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raise ValueError('Unexpected syslog_log_facility: %s' % v)
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else:
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default_facility = logging.handlers.SysLogHandler.LOG_SYSLOG
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self.syslog_log_facility = default_facility
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# syslog_log_level
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if config.has_option("DEFAULT", "syslog_log_level"):
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v = config.get("DEFAULT", "syslog_log_level")
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self.syslog_log_level = logging.getLevelName(v.upper())
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if (self.syslog_log_level == "Level %s" % v.upper()):
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raise ValueError('Unexepected syslog_log_level: %s' % v)
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else:
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self.syslog_log_level = logging.ERROR
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# use_syslog
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if config.has_option("DEFAULT", "use_syslog"):
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self.use_syslog = config.getboolean("DEFAULT", "use_syslog")
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else:
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self.use_syslog = False
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def setup_syslog(execname, facility, level):
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rootwrap_logger = logging.getLogger()
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rootwrap_logger.setLevel(level)
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handler = logging.handlers.SysLogHandler(address='/dev/log',
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facility=facility)
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handler.setFormatter(logging.Formatter(
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os.path.basename(execname) + ': %(message)s'))
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rootwrap_logger.addHandler(handler)
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def build_filter(class_name, *args):
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"""Returns a filter object of class class_name."""
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if not hasattr(filters, class_name):
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logging.warning("Skipping unknown filter class (%s) specified "
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"in filter definitions" % class_name)
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return None
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filterclass = getattr(filters, class_name)
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return filterclass(*args)
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def load_filters(filters_path):
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"""Load filters from a list of directories."""
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filterlist = []
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for filterdir in filters_path:
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if not os.path.isdir(filterdir):
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continue
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for filterfile in os.listdir(filterdir):
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filterconfig = ConfigParser.RawConfigParser()
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filterconfig.read(os.path.join(filterdir, filterfile))
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for (name, value) in filterconfig.items("Filters"):
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filterdefinition = [string.strip(s) for s in value.split(',')]
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newfilter = build_filter(*filterdefinition)
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if newfilter is None:
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continue
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newfilter.name = name
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filterlist.append(newfilter)
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return filterlist
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def match_filter(filter_list, userargs, exec_dirs=[]):
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"""Return first matched filter from command filters.
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Checks user command and arguments through command filters and
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returns the first matching filter.
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Raises NoFilterMatched if no filter matched.
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Raises FilterMatchNotExecutable if no executable was found for the
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best filter match.
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"""
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first_not_executable_filter = None
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for f in filter_list:
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if f.match(userargs):
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if isinstance(f, filters.ExecCommandFilter):
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# This command calls exec verify that remaining args
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# matches another filter.
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leaf_filters = [fltr for fltr in filter_list
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if not isinstance(fltr,
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filters.ExecCommandFilter)]
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args = f.exec_args(userargs)
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if (not args or not
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match_filter(leaf_filters, args, exec_dirs=exec_dirs)):
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continue
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# Try other filters if executable is absent
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if not f.get_exec(exec_dirs=exec_dirs):
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if not first_not_executable_filter:
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first_not_executable_filter = f
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continue
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# Otherwise return matching filter for execution
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return f
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if first_not_executable_filter:
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# A filter matched, but no executable was found for it
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raise FilterMatchNotExecutable(match=first_not_executable_filter)
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# No filter matched
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raise NoFilterMatched()
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