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decompose.py

# Analysis:
# packetType: 'B' - EB_BRAILLE_DISPLAY
# packetSubType: 'S' - EB_BRAILLE_DISPLAY_STATIC

import textwrap
import string

class Packet:
    def __init__(self, packetSize=None, packetType=None, packetSubType=None, packetData=None):
        self.packetSize = packetSize
        self.packetType = packetType
        self.packetSubType = packetSubType
        self.packetData = packetData

    # Packet info is of the form:
    # 02:00:04:53:49:03:55:55:55:55:55:55:55:
    def load_raw(self, packet_info):
        sections = packet_info.split(':')
        stx = sections[0]
        packetSize = int(sections[1] + sections[2], 16)
        packetType = int(sections[3], 16)
        packetSubType = int(sections[4], 16)

        etx = sections.index("03")
        packetData = (''.join(sections[5:etx]))

        self.packetSize = packetSize
        self.packetType = packetType
        self.packetSubType = packetSubType
        self.packetData = packetData

if __name__ == "__main__":
    conversation = open('final_conversations.txt', 'r').read().splitlines()

    p_list = []

    for packet in conversation[1:]:
        t_p = Packet()
        t_p.load_raw(packet)
        p_list.append(t_p)
        temp = textwrap.wrap(t_p.packetData, 2)
        print ''.join([x.decode('hex') for x in temp if x.decode('hex') in string.printable])

    init_packet = conversation[0]

    config_packet = Packet()
    config_packet.load_raw(init_packet)

    '''
    print "[+] Config Packet:"
    print "[+] packetType:" + hex(config_packet.packetType)
    print "[+] packetSubType:" + hex(config_packet.packetSubType)
    print "[+] ***********"
    '''

    # Loading up some more config packets for analysis
    s_config = open('data', 'r').read().splitlines()

    for s_packet in s_config:
        packet = Packet()
        packet.load_raw(s_packet)
        '''
        print "[+] S_CONFIG Packet: "
        print "[+] packetType:" + hex(packet.packetType)
        print "[+] packetSubType:" + hex(packet.packetSubType)
        print "[+] packetData:" + packet.packetData
        print "[+] ***********"
        '''

        if packet.packetSubType == 0x47:
            # print "[+] Display Length: " + str(int(packet.packetData, 16))
            pass