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Contents
#!/usr/bin/env ruby
module Rex
module Post
module Meterpreter
###
#
# This class is responsible for reading in and decrypting meterpreter
# packets that arrive on a socket
#
###
class PacketParser
#
# Initializes the packet parser context with an optional cipher.
#
def initialize(cipher = nil)
self.cipher = cipher
reset
end
#
# Resets the parser state so that a new packet can begin being parsed.
#
def reset
self.raw = ''
self.hdr_length_left = 8
self.payload_length_left = 0
end
#
# Reads data from the wire and parse as much of the packet as possible.
#
def recv(sock)
if (self.hdr_length_left > 0)
buf = sock.read(self.hdr_length_left)
if (buf)
self.raw << buf
self.hdr_length_left -= buf.length
else
raise EOFError
end
# If we've finished reading the header, set the
# payload length left to the number of bytes
# specified in the length
if (self.hdr_length_left == 0)
self.payload_length_left = raw.unpack("N")[0] - 8
end
elsif (self.payload_length_left > 0)
buf = sock.read(self.payload_length_left)
if (buf)
self.raw << buf
self.payload_length_left -= buf.length
else
raise EOFError
end
end
# If we've finished reading the entire packet
if ((self.hdr_length_left == 0) &&
(self.payload_length_left == 0))
# Create a typeless packet
packet = Packet.new(0)
# TODO: cipher decryption
if (cipher)
end
# Serialize the packet from the raw buffer
packet.from_r(self.raw)
# Reset our state
reset
return packet
end
end
protected
attr_accessor :cipher, :raw, :hdr_length_left, :payload_length_left # :nodoc:
end
end; end; end
Version data entries
43 entries across 43 versions & 1 rubygems