add updated wireshark dissector
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iusb.lua
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iusb.lua
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----------------------------------------
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--
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-- Script-Name: iusb_dissector.lua
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--
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-- Author: Stan Ayzenberg
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-- Copyright (c) 2015, Stan Ayzenberg
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--
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-- Version: 1.1 (08/05/15)
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-- Instructions:
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-- Place me in "$HOME/.wireshark/plugins" and either sniff traffic or open a PCAP.
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-- Notes:
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-- Right now this is hard-coded for TCP port 5123 which is used for Floppy images.
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-- I might include CD-ROM filters in this later on as the packet structures are identical.
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-- Should work for the most part... might fix some bugs later.
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-- Credit for sample code used here goes to "securez" from http://blog.roisu.org/english-create-a-wireshark-dissector-with-lua/
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-- create iusb protocol and its fields
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protocol_iusb = Proto ("iusb","IUSB")
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local f_sig = ProtoField.string("iusb.sig", "Protocol Signature", FT_STRING)
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local f_major = ProtoField.uint32("iusb.major", "Major")
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local f_minor = ProtoField.uint32("iusb.minor", "Minor")
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local f_pkt_hdr = ProtoField.uint32("iusb.pkt_hdr", "Packet Header Len")
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local f_hdr_cksum = ProtoField.uint32("iusb.hdr_cksum", "Header Checksum", base.HEX)
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local f_data_pkt_len = ProtoField.uint32("iusb.data_pkt_len", "Data Packet Length")
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local f_direction = ProtoField.bytes("iusb.direction", "Data Direction", base.SPACE)
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local f_dev_type = ProtoField.bytes("iusb.dev_type", "Device Type")
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local f_server_caps = ProtoField.bytes("iusb.server_caps", "Server Capabilities")
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local f_protocol = ProtoField.uint32("iusb.protocol", "Protocol")
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local f_dev_num = ProtoField.bytes("iusb.dev_num", "Device Number")
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local f_iface_num = ProtoField.bytes("iusb.iface_num", "Interface Number")
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local f_client_data = ProtoField.bytes("iusb.client_data", "Client Data")
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local f_seq_num = ProtoField.uint32("iusb.seq_num", "Sequence Number Echo", base.HEX)
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local f_res = ProtoField.uint32("iusb.res", "Reserved Space", base.HEX)
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local f_data = ProtoField.bytes("iusb.data", "Raw Packet Data", base.SPACE)
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-- Lets try to describ our data packet
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-- It just encapsulates SCSI...
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local pkt_cmd = ProtoField.uint32("iusb.pkt_cmd", "Packet Command", base.HEX)
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local pkt_read_off = ProtoField.uint32("iusb.read_off", "Read Offset", base.HEX)
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local pkt_read_size = ProtoField.uint32("iusb.read_size", "Read Size", base.HEX)
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local pkt_is_err = ProtoField.uint32("iusb.is_err", "Is Err", base.HEX)
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local pkt_sense_key = ProtoField.uint32("iusb.sense_key", "Sense Key", base.HEX)
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local pkt_asc = ProtoField.uint32("iusb.asc", "ASC", base.HEX)
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local pkt_ascq = ProtoField.uint32("iusb.ascq", "ASCQ", base.HEX)
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protocol_iusb.fields = {f_sig, f_major, f_minor, f_pkt_hdr, f_hdr_cksum, f_data_pkt_len, f_server_caps, f_direction, f_dev_type, f_protocol, f_dev_num, f_iface_num, f_client_data, f_seq_num, f_res, f_data, pkt_cmd, pkt_read_off, pkt_read_size, pkt_is_err, pkt_sense_key, pkt_asc, pkt_ascq}
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-- Set the preferences to listen on TCP 5123
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protocol_iusb.prefs["tcp_port"] = Pref.uint("TCP Port", 5123, "TCP Port for IUSB (CDROM)")
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--protocol_iusb.prefs["tcp_port"] = Pref.uint("TCP Port", 5123, "TCP Port for IUSB (Floppy)")
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-- iusb dissector function
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function protocol_iusb.dissector (buf, pinfo, root)
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pinfo.cols.protocol = protocol_iusb.name
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-- create subtree for iusb
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subtree = root:add(protocol_iusb, buf(), "IUSB Protocol / Virtual Media (Floppy/CD-ROM)")
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-- add protocol fields to subtree
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subtree:add(f_sig, buf(0,8))
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subtree:add(f_major, buf(8,1))
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subtree:add(f_minor, buf(9,1))
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subtree:add(f_pkt_hdr, buf(10,1))
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subtree:add(f_hdr_cksum, buf(11,1))
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-- The Data Packet Length is a 4-byte little-endian value
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subtree:add_le(f_data_pkt_len, buf(12,4)):append_text(" Bytes") --buf(12,1))
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subtree:add(f_server_caps, buf(16, 1))
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subtree:add(f_dev_type, buf(17, 1))
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subtree:add(f_protocol, buf(18, 1))
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-- Check direction of data flow, this can probably be cleaner.
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local flags = buf(19,1):uint()
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local flags_s = {}
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if bit.band(flags, 0x80) > 0 then table.insert(flags_s, "TX") else table.insert(flags_s, "RX") end
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subtree:add(f_direction, buf(19,1)):append_text(" (" .. table.concat(flags_s, ", ") .. ")")
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subtree:add(f_dev_num, buf(20, 1))
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subtree:add(f_iface_num, buf(21, 1))
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subtree:add(f_client_data, buf(22, 2))
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subtree:add(f_seq_num, buf(24, 4))
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subtree:add(f_res, buf(28, 4))
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-- Actual data packet is past 32-byte header and length is determined from f_data_pkt_len
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subtree:add(f_data, buf(32, buf(12,2):le_int()))
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-- Add a tree for our Data Packet (SCSI). Need to figure out how to add a nested tree, later.
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datatree = root:add(protocol_iusb, buf(32, buf(12,2):le_int()), "SCSI data")
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datatree:add(pkt_cmd, buf(41,1))
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datatree:add(pkt_read_off, buf(43,4))
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datatree:add(pkt_read_size, buf(48,2))
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datatree:add(pkt_is_err, buf(53,1))
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datatree:add(pkt_sense_key, buf(54,1))
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datatree:add(pkt_asc, buf(55,1))
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datatree:add(pkt_ascq, buf(56,1))
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end
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-- Initialization routine
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function protocol_iusb.init()
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local tcp_dissector_table = DissectorTable.get("tcp.port")
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tcp_dissector_table:add(protocol_iusb.prefs["tcp_port"], protocol_iusb)
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end
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