# -*- coding: binary -*-
#
# Core
#
require 'pathname'

#
# Project
#
require 'fastlib'
require 'msf/core'
require 'msf/core/module_set'

module Msf
  # Upper management decided to throw in some middle management
  # because the modules were getting out of hand.  This bad boy takes
  # care of the work of managing the interaction with modules in terms
  # of loading and instantiation.
  #
  # @todo add unload support
  class ModuleManager #< ModuleSet
    include Msf::Framework::Offspring

    require 'msf/core/payload_set'

    # require here so that Msf::ModuleManager is already defined
    require 'msf/core/module_manager/cache'
    require 'msf/core/module_manager/loading'
    require 'msf/core/module_manager/module_paths'
    require 'msf/core/module_manager/module_sets'
    require 'msf/core/module_manager/reloading'

    include Msf::ModuleManager::Cache
    include Msf::ModuleManager::Loading
    include Msf::ModuleManager::ModulePaths
    include Msf::ModuleManager::ModuleSets
    include Msf::ModuleManager::Reloading

    #
    # CONSTANTS
    #

    # Maps module type directory to its module type.
    TYPE_BY_DIRECTORY = Msf::Modules::Loader::Base::DIRECTORY_BY_TYPE.invert

    def [](key)
      names = key.split("/")
      type = names.shift

      module_set = module_set_by_type[type]

      module_reference_name = names.join("/")
      module_set[module_reference_name]
    end

    # Creates a module instance using the supplied reference name.
    #
    # @param name [String] A module reference name.  It may optionally
    #   be prefixed with a "<type>/", in which case the module will be
    #   created from the {Msf::ModuleSet} for the given <type>.
    #   Otherwise, we step through all sets until we find one that
    #   matches.
    # @return (see Msf::ModuleSet#create)
    def create(name)
      # Check to see if it has a module type prefix.  If it does,
      # try to load it from the specific module set for that type.
      names = name.split("/")
      potential_type_or_directory = names.first

      # if first name is a type
      if Msf::Modules::Loader::Base::DIRECTORY_BY_TYPE.has_key? potential_type_or_directory
        type = potential_type_or_directory
      # if first name is a type directory
      else
        type = TYPE_BY_DIRECTORY[potential_type_or_directory]
      end

      m = nil
      if type
        module_set = module_set_by_type[type]

        # First element in names is the type, so skip it
        module_reference_name = names[1 .. -1].join("/")
        m = module_set.create(module_reference_name)
      else
        # Then we don't have a type, so we have to step through each set
        # to see if we can create this module.
        module_set_by_type.each do |_, set|
          module_reference_name = names.join("/")
          m = set.create(module_reference_name)
          break if m
        end
      end

      m
    end


    # @param framework [Msf::Framework] The framework for which this
    #   instance is managing the modules.
    # @param types [Array<String>] List of module types to load.
    #   Defaults to all module types in {Msf::MODULE_TYPES}.
    def initialize(framework, types=Msf::MODULE_TYPES)
      #
      # defaults
      #

      self.module_info_by_path = {}
      self.enablement_by_type = {}
      self.module_load_error_by_path = {}
      self.module_paths = []
      self.module_set_by_type = {}

      #
      # from arguments
      #

      self.framework = framework

      types.each { |type|
        init_module_set(type)
      }
    end

    protected

    # This method automatically subscribes a module to whatever event
    # providers it wishes to monitor.  This can be used to allow modules
    # to automatically execute or perform other tasks when certain
    # events occur.  For instance, when a new host is detected, other
    # aux modules may wish to run such that they can collect more
    # information about the host that was detected.
    #
    # @param mod [Class] A subclass of Msf::Module
    # @return [void]
    def auto_subscribe_module(mod)
      # If auto-subscribe has been disabled
      if (framework.datastore['DisableAutoSubscribe'] and
          framework.datastore['DisableAutoSubscribe'] =~ /^(y|1|t)/)
        return
      end

      # If auto-subscription is enabled (which it is by default), figure out
      # if it subscribes to any particular interfaces.
      inst = nil

      #
      # Exploit event subscriber check
      #
      if (mod.include?(Msf::ExploitEvent) == true)
        framework.events.add_exploit_subscriber((inst) ? inst : (inst = mod.new))
      end

      #
      # Session event subscriber check
      #
      if (mod.include?(Msf::SessionEvent) == true)
        framework.events.add_session_subscriber((inst) ? inst : (inst = mod.new))
      end
    end
  end
end