#!/usr/bin/python

# ------------------------------------------------------------

# opensecurity package file

#

# Autor: X-Net Services GmbH <office@x-net.at>

#

# Copyright 2013-2014 X-Net and AIT Austrian Institute of Technology

#

#

#     X-Net Technologies GmbH

#     Elisabethstrasse 1

#     4020 Linz

#     AUSTRIA

#     https://www.x-net.at

#

#     AIT Austrian Institute of Technology

#     Donau City Strasse 1

#     1220 Wien

#     AUSTRIA

#     http://www.ait.ac.at

#

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

#    http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

# ------------------------------------------------------------

import ConfigParser

import sys

import logging

import os

import errno

import time

import pyclamav

class ClamAVScanner:

    # User the existing logger  instance

    __LOG = logging.getLogger("IkarusScanner")

    __MINOPTS = { "Main" : ["Nothing"]}

    __CONFIG_NOT_READABLE = "Configfile is not readable"

    __CONFIG_WRONG = "Something is wrong with the config"

    __CONFIG_MISSING = "Section: \"%s\" Option: \"%s\" in configfile is missing"

    def __init__ (self, scanner_config_path):

        config = self.loadConfig (scanner_config_path)

    def checkMinimumOptions (self, config):

        for section, options in self.__MINOPTS.iteritems ():

            for option in options:

                if (config.has_option(section, option) == False):

                    self.__LOG.error (self.__CONFIG_MISSING % (section, option))

                    exit (129)

    def loadConfig (self, scanner_config_path):

        configfile = scanner_config_path

        config = ConfigParser.SafeConfigParser ()

        if ((os.path.exists (scanner_config_path) == False) or (os.path.isfile (scanner_config_path) == False) or (os.access (scanner_config_path, os.R_OK) == False)):

            self.__LOG.error(self.__CONFIG_NOT_READABLE);

            raise SystemError(self.__CONFIG_NOT_READABLE)

        try:

            config.read (scanner_config_path)

        except Exception, e:

            self.__LOG.error("Error: %s" % (e));

            raise SystemError("Error: %s" % (e))

        self.checkMinimumOptions (config)

        return config

    def scanFile (self, path, fileobject):

        return self.scanFileClamAV (path)

    def scanFileClamAV (self, path):        

        retval = { "infected" : False, "virusname" : "Unknown" }

        self.__LOG.debug ("Scan File: %s" % (path))

        result = pyclamav.scanfile (path)

        self.__LOG.debug ("Result of file \"%s\": %s" % (path, result))

        if (result[0] != 0):

            retval["infected"] = True

            retval["virusname"] = result[1]

        if (retval["infected"] == True):

            self.__LOG.error ("Virus found, deny Access %s" % (result,))

        return retval