Class: BetterCap::Spoofers::Hsrp

Inherits:
Base
  • Object
show all
Defined in:
lib/bettercap/spoofers/hsrp.rb

Overview

Instance Method Summary collapse

Methods inherited from Base

available, get_by_name, inherited

Constructor Details

#initialize ⇒ Hsrp

Initialize the BetterCap::Spoofers::HSRP object.



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# File 'lib/bettercap/spoofers/hsrp.rb', line 72

def initialize
  @ctx          = Context.get
  @forwarding   = @ctx.firewall.forwarding_enabled?
  @spoof_thread = nil
  @hsrp_thread  = nil
  @arp_thread   = nil
  @running      = false

  # HelloTime - Time (in seconds) between Hello messages
  @hellotime = 3 # default

  # HoldTime - Time (in seconds) for which the Hello message is valid
  @holdtime = 255 # max

  # Table of HSRP groups
  @groups = []

  update_gateway!
end

Instance Method Details

#start ⇒ Object

Start the HSRP spoofing



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# File 'lib/bettercap/spoofers/hsrp.rb', line 93

def start
  Logger.debug "Starting HSRP spoofer ..."

  stop() if @running
  @running = true

  if @ctx.options.spoof.kill
    Logger.warn 'Disabling packet forwarding.'
    @ctx.firewall.enable_forwarding(false) if @forwarding
  else
    @ctx.firewall.enable_forwarding(true) unless @forwarding
  end

  @hsrp_thread = Thread.new { hsrp_watcher }
  @arp_thread = Thread.new { arp_watcher }
  @spoof_thread = Thread.new { hsrp_spoofer }
end

#stop ⇒ Object

Stop the HSRP spoofing and reset firewall state



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# File 'lib/bettercap/spoofers/hsrp.rb', line 112

def stop
  raise 'HSRP spoofer is not running' unless @running

  Logger.debug 'Stopping HSRP spoofer ...'

  @running = false
  begin
    @spoof_thread.exit
  rescue
  end

  # Send a few resign packets
  @groups.each do |vip, group, password|
    3.times do
      send_resign vip, group, password
    end
  end

  Logger.debug "Resetting packet forwarding to #{@forwarding} ..."

  @ctx.firewall.enable_forwarding( @forwarding )
end