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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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class MetasploitModule < Msf::Encoder
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  # This may produce incorrect code, such as in quoted strings
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  Rank = LowRanking
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  def initialize
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    super(
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      'Name'        => 'Bourne ${IFS} Substitution Command Encoder',
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      'Description' => %q{
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        This encoder uses Bourne ${IFS} substitution to avoid whitespace
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        without being overly fancy.
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      },
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      'Author'      => ['egypt', 'wvu'],
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      'Platform'    => %w[ linux unix ],
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      'Arch'        => ARCH_CMD,
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      'EncoderType' => Msf::Encoder::Type::CmdPosixIFS
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    )
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  end
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  def encode_block(state, buf)
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    # Skip encoding if there are no badchars
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    return buf if state.badchars !~ /\s/
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    # Perform ${IFS} encoding
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    buf.gsub(/\s+/, '${IFS}')
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  end
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end
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