Index: squid-tagger.py
==================================================================
--- squid-tagger.py
+++ squid-tagger.py
@@ -169,16 +169,23 @@
 class tagDB(object):
 	__slots__ = frozenset(['_cursor', '_db'])
 
 	def __init__(self):
 		config.section('database')
-		self._db = psycopg2.connect(
-			database = config['database'],
-			host = config['host'],
-			user = config['user'],
-			password = config['password'],
-		)
+		if config['host'] == None:
+			self._db = psycopg2.connect(
+				database = config['database'],
+				user = config['user'],
+				password = config['password']
+			)
+		else:
+			self._db = psycopg2.connect(
+				database = config['database'],
+				host = config['host'],
+				user = config['user'],
+				password = config['password']
+			)
 		self._cursor = self._db.cursor()
 
 	def _field_names(self):
 		names = []
 		for record in self._cursor.description:
@@ -277,10 +284,75 @@
 
 	def loop(self):
 		pool = gevent.pool.Pool()
 		pool.spawn(self.check)
 		pool.join()
+
+# this classes processes config file and substitutes default values
+class Config:
+	__slots__ = frozenset(['_config', '_default', '_section', 'options'])
+	_default = {
+		'log': {
+			'silent': 'no',
+		},
+		'database': {
+			'host': None,
+			'database': 'squidTag',
+	},}
+
+	# function to read in config file
+	def __init__(self):
+		import ConfigParser, optparse, os
+
+		parser = optparse.OptionParser()
+		parser.add_option('-c', '--config', dest = 'config',
+			help = 'config file location', metavar = 'FILE',
+			default = '/usr/local/etc/squid-tagger.conf')
+		parser.add_option('-d', '--dump', dest = 'dump',
+			help = 'dump database', action = 'store_true', metavar = 'bool',
+			default = False)
+		parser.add_option('-f', '--flush-database', dest = 'flush_db',
+			help = 'flush previous database on load', default = False,
+			action = 'store_true', metavar = 'bool')
+		parser.add_option('-l', '--load', dest = 'load',
+			help = 'load database', action = 'store_true', metavar = 'bool',
+			default = False)
+		parser.add_option('-D', '--dump-conf', dest = 'dump_conf',
+			help = 'dump filtering rules', default = False, metavar = 'bool',
+			action = 'store_true')
+		parser.add_option('-L', '--load-conf', dest = 'load_conf',
+			help = 'load filtering rules', default = False, metavar = 'bool',
+			action = 'store_true')
+
+		(self.options, args) = parser.parse_args()
+
+		assert os.access(self.options.config, os.R_OK), "Fatal error: can't read {}".format(self.options.config)
+
+		self._config = ConfigParser.ConfigParser()
+		self._config.readfp(open(self.options.config))
+
+	# function to select config file section or create one
+	def section(self, section):
+		if not self._config.has_section(section):
+			self._config.add_section(section)
+		self._section = section
+
+	# function to get config parameter, if parameter doesn't exists the default
+	# value or None is substituted
+	def __getitem__(self, name):
+		if not self._config.has_option(self._section, name):
+			if self._section in self._default:
+				if name in self._default[self._section]:
+					self._config.set(self._section, name, self._default[self._section][name])
+				else:
+					self._config.set(self._section, name, None)
+			else:
+				self._config.set(self._section, name, None)
+		return(self._config.get(self._section, name))
+
+# initializing and reading in config file
+config = Config()
 
 if config.options.dump or config.options.load or config.options.dump_conf or config.options.load_conf:
 	import csv
 
 	tagdb = tagDB()