# This file was contributed to the Volatility Framework Version 3.
# Copyright (C) 2018 Volatility Foundation.
#
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from typing import Iterable

import volatility.plugins.windows.poolscanner as poolscanner

import volatility.framework.interfaces.plugins as plugins
from volatility.framework import renderers, interfaces, exceptions
from volatility.framework.configuration import requirements
from volatility.framework.renderers import format_hints


class DriverScan(plugins.PluginInterface):
    """Scans for drivers present in a particular windows memory image"""

    @classmethod
    def get_requirements(cls):
        return [
            requirements.TranslationLayerRequirement(
                name = 'primary', description = 'Memory layer for the kernel', architectures = ["Intel32", "Intel64"]),
            requirements.SymbolTableRequirement(name = "nt_symbols", description = "Windows kernel symbols"),
        ]

    @classmethod
    def scan_drivers(cls,
                     context: interfaces.context.ContextInterface,
                     layer_name: str,
                     symbol_table: str) -> \
            Iterable[interfaces.objects.ObjectInterface]:
        """Scans for drivers using the poolscanner module and constraints"""

        constraints = poolscanner.PoolScanner.builtin_constraints(symbol_table, [b'Dri\xf6', b'Driv'])

        for result in poolscanner.PoolScanner.generate_pool_scan(context, layer_name, symbol_table, constraints):

            _constraint, mem_object, _header = result
            yield mem_object

    def _generator(self):
        for driver in self.scan_drivers(self.context, self.config['primary'], self.config['nt_symbols']):

            try:
                driver_name = driver.get_driver_name()
            except exceptions.InvalidAddressException:
                driver_name = renderers.NotApplicableValue()

            try:
                service_key = driver.DriverExtension.ServiceKeyName.String
            except exceptions.InvalidAddressException:
                service_key = renderers.NotApplicableValue()

            try:
                name = driver.DriverName.String
            except exceptions.InvalidAddressException:
                name = renderers.NotApplicableValue()

            yield (0, (format_hints.Hex(driver.vol.offset), format_hints.Hex(driver.DriverStart),
                       format_hints.Hex(driver.DriverSize), service_key, driver_name, name))

    def run(self):
        return renderers.TreeGrid([("Offset", format_hints.Hex),
                                   ("Start", format_hints.Hex), ("Size", format_hints.Hex), ("Service Key", str),
                                   ("Driver Name", str), ("Name", str)], self._generator())