/* packet-turbocell.c * Routines for Turbocell Header dissection * Copyright 2004, Colin Slater * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ /* This dissector was written entirely from reverse engineering captured * packets. No documentation was used or supplied by Karlnet. Hence, this * dissector is very incomplete. If you have any insight into decoding * these packets, or if you can supply packet captures from turbocell * networks, contact kiltedtaco@xxxxxxxxx */ /* 2008-08-05 : Added support for aggregate frames. * AP mode, NWID and sat mode fiels identification were * taken from http://aphopper.sourceforge.net/turbocell.html * everything else is based on (educated) guesses. */ #include "config.h" #include #include #define TURBOCELL_TYPE_BEACON_NON_POLLING 0x00 #define TURBOCELL_TYPE_BEACON_NORMAL 0x40 #define TURBOCELL_TYPE_BEACON_POLLING 0x80 #define TURBOCELL_TYPE_BEACON_ISP 0xA0 #define TURBOCELL_TYPE_DATA 0x01 #define TURBOCELL_TYPE_MANAGEMENT 0x11 #define TURBOCELL_SATTELITE_MODE_DENY 0x1 #define TURBOCELL_SATTELITE_MODE_ALLOW 0x2 void proto_register_turbocell(void); void proto_reg_handoff_turbocell(void); static int proto_turbocell = -1; static int proto_aggregate = -1; static int hf_turbocell_type = -1; static int hf_turbocell_dst = -1; static int hf_turbocell_counter = -1; static int hf_turbocell_name = -1; static int hf_turbocell_nwid = -1; static int hf_turbocell_satmode = -1; static int hf_turbocell_unknown = -1; static int hf_turbocell_timestamp = -1; static int hf_turbocell_station = -1; static int hf_turbocell_ip = -1; static int hf_turbocell_aggregate_msdu_header_text = -1; static int hf_turbocell_aggregate_msdu_len = -1; static int hf_turbocell_aggregate_unknown1 = -1; static int hf_turbocell_aggregate_unknown2 = -1; static int hf_turbocell_aggregate_len = -1; static gint ett_turbocell = -1; static gint ett_network = -1; static gint ett_msdu_aggregation_parent_tree = -1; static gint ett_msdu_aggregation_subframe_tree = -1; /* The ethernet dissector we hand off to */ static dissector_handle_t eth_handle; static dissector_handle_t data_handle; static const value_string turbocell_type_values[] = { { TURBOCELL_TYPE_BEACON_NON_POLLING, "Beacon (Non-Polling Base Station)" }, { TURBOCELL_TYPE_BEACON_NORMAL, "Beacon (Normal Base Station)" }, { TURBOCELL_TYPE_BEACON_POLLING, "Beacon (Polling Base Station)" }, { TURBOCELL_TYPE_BEACON_ISP, "Beacon (ISP Base Station)" }, { TURBOCELL_TYPE_DATA, "Data Packet" }, { TURBOCELL_TYPE_MANAGEMENT, "Management Packet" }, { 0, NULL } }; static const value_string turbocell_satmode_values[] = { { TURBOCELL_SATTELITE_MODE_DENY, "Allowed to connect" }, { TURBOCELL_SATTELITE_MODE_ALLOW, "NOT allowed to connect" }, { 0, NULL } }; static int dissect_turbocell(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) { proto_item *ti, *name_item; proto_tree *turbocell_tree = NULL, *network_tree; tvbuff_t *next_tvb; int i=0; guint8 packet_type; guint8 * str_name; guint str_len; gint remaining_length; packet_type = tvb_get_guint8(tvb, 0); if (!(packet_type & 0x0F)){ col_set_str(pinfo->cinfo, COL_INFO, "Turbocell Packet (Beacon)"); col_set_str(pinfo->cinfo, COL_PROTOCOL, "Turbocell"); } else if ( packet_type == TURBOCELL_TYPE_MANAGEMENT ) { col_set_str(pinfo->cinfo, COL_INFO, "Turbocell Packet (Management)"); col_set_str(pinfo->cinfo, COL_PROTOCOL, "Turbocell"); } else if ( packet_type == TURBOCELL_TYPE_DATA ) { col_set_str(pinfo->cinfo, COL_INFO, "Turbocell Packet (Data)"); col_set_str(pinfo->cinfo, COL_PROTOCOL, "Turbocell"); } else { col_set_str(pinfo->cinfo, COL_INFO, "Turbocell Packet (Unknown)"); col_set_str(pinfo->cinfo, COL_PROTOCOL, "Turbocell"); } if (tree) { ti = proto_tree_add_item(tree, proto_turbocell, tvb, 0, 20, ENC_NA); turbocell_tree = proto_item_add_subtree(ti, ett_turbocell); proto_tree_add_item(turbocell_tree, hf_turbocell_type, tvb, 0, 1, ENC_BIG_ENDIAN); proto_tree_add_item(turbocell_tree, hf_turbocell_satmode, tvb, 1, 1, ENC_BIG_ENDIAN); proto_tree_add_item(turbocell_tree, hf_turbocell_nwid, tvb, 1, 1, ENC_BIG_ENDIAN); /* it seem when we have this magic number,that means an alternate header version */ if (tvb_get_bits64(tvb, 64,48,ENC_BIG_ENDIAN) != G_GINT64_CONSTANT(0x000001fe23dc45ba)){ proto_tree_add_item(turbocell_tree, hf_turbocell_counter, tvb, 0x02, 2, ENC_BIG_ENDIAN); proto_tree_add_item(turbocell_tree, hf_turbocell_dst, tvb, 0x04, 6, ENC_NA); proto_tree_add_item(turbocell_tree, hf_turbocell_timestamp, tvb, 0x0A, 3, ENC_BIG_ENDIAN); } else { proto_tree_add_item(turbocell_tree, hf_turbocell_timestamp, tvb, 0x02, 3, ENC_BIG_ENDIAN); proto_tree_add_item(turbocell_tree, hf_turbocell_counter, tvb, 0x05, 3, ENC_BIG_ENDIAN); proto_tree_add_item(turbocell_tree, hf_turbocell_dst, tvb, 0x08, 6, ENC_NA); } proto_tree_add_item(turbocell_tree, hf_turbocell_unknown, tvb, 0x0E, 2, ENC_BIG_ENDIAN); proto_tree_add_item(turbocell_tree, hf_turbocell_ip, tvb, 0x10, 4, ENC_BIG_ENDIAN); } remaining_length=tvb_reported_length_remaining(tvb, 0x14); if (remaining_length > 6) { /* If the first character is a printable character that means we have a payload with network info */ /* I couldn't find anything in the header that would definitvely indicate if payload is either data or network info */ /* Since the frame size is limited this should work ok */ if (tvb_get_guint8(tvb, 0x14)>=0x20){ name_item = proto_tree_add_item(turbocell_tree, hf_turbocell_name, tvb, 0x14, 30, ENC_ASCII|ENC_NA); network_tree = proto_item_add_subtree(name_item, ett_network); str_name=tvb_get_stringz_enc(wmem_packet_scope(), tvb, 0x14, &str_len, ENC_ASCII); col_append_fstr(pinfo->cinfo, COL_INFO, ", Network=\"%s\"",format_text(str_name, str_len-1)); while(tvb_get_guint8(tvb, 0x34 + 8*i)==0x00 && (tvb_reported_length_remaining(tvb,0x34 + 8*i) > 6) && (i<32)) { proto_tree_add_item(network_tree, hf_turbocell_station, tvb, 0x34+8*i, 6, ENC_NA); i++; } /*Couldn't make sense of the apparently random data in the end*/ next_tvb = tvb_new_subset_remaining(tvb, 0x34 + 8*i); call_dissector(data_handle, next_tvb, pinfo, tree); } else { tvbuff_t *msdu_tvb = NULL; guint32 msdu_offset = 0x04; guint16 j = 1; guint16 msdu_length; proto_item *parent_item; proto_tree *mpdu_tree; proto_tree *subframe_tree; next_tvb = tvb_new_subset(tvb, 0x14, -1, tvb_get_ntohs(tvb, 0x14)); parent_item = proto_tree_add_protocol_format(tree, proto_aggregate, next_tvb, 0, tvb_reported_length_remaining(next_tvb, 0), "Turbocell Aggregate Frames"); mpdu_tree = proto_item_add_subtree(parent_item, ett_msdu_aggregation_parent_tree); proto_tree_add_item(mpdu_tree, hf_turbocell_aggregate_len, next_tvb, 0x00, 2, ENC_BIG_ENDIAN); proto_tree_add_item(mpdu_tree, hf_turbocell_aggregate_unknown1, next_tvb, 0x02, 2, ENC_BIG_ENDIAN); remaining_length=tvb_reported_length_remaining(next_tvb, msdu_offset); do { msdu_length = (tvb_get_letohs(next_tvb, msdu_offset) & 0x0FFF); if (msdu_length==0) break; parent_item = proto_tree_add_uint_format(mpdu_tree, hf_turbocell_aggregate_msdu_header_text, next_tvb,msdu_offset, msdu_length + 0x02,j, "A-MSDU Subframe #%u", j); subframe_tree = proto_item_add_subtree(parent_item, ett_msdu_aggregation_subframe_tree); j++; proto_tree_add_item(subframe_tree, hf_turbocell_aggregate_msdu_len, next_tvb, msdu_offset, 2, ENC_LITTLE_ENDIAN); proto_tree_add_item(subframe_tree, hf_turbocell_aggregate_unknown2, next_tvb, msdu_offset+1, 1, ENC_BIG_ENDIAN); msdu_offset += 0x02; remaining_length -= 0x02; msdu_tvb = tvb_new_subset(next_tvb, msdu_offset, (msdu_length>remaining_length)?remaining_length:msdu_length, msdu_length); call_dissector(eth_handle, msdu_tvb, pinfo, subframe_tree); msdu_offset += msdu_length; remaining_length -= msdu_length; } while (remaining_length > 6); if (remaining_length > 2) { next_tvb = tvb_new_subset_remaining(next_tvb, msdu_offset); call_dissector(data_handle, next_tvb, pinfo, tree); } } } return tvb_captured_length(tvb); } /* Register the protocol with Wireshark */ void proto_register_turbocell(void) { static hf_register_info hf[] = { { &hf_turbocell_type, { "Packet Type", "turbocell.type", FT_UINT8, BASE_HEX, VALS(turbocell_type_values), 0, NULL, HFILL } }, { &hf_turbocell_satmode, { "Satellite Mode", "turbocell.satmode", FT_UINT8, BASE_HEX, VALS(turbocell_satmode_values), 0xF0, NULL, HFILL } }, { &hf_turbocell_nwid, { "Network ID", "turbocell.nwid", FT_UINT8, BASE_DEC, NULL, 0x0F, NULL, HFILL } }, { &hf_turbocell_counter, { "Counter", "turbocell.counter", FT_UINT24, BASE_DEC_HEX, NULL, 0, "Increments every frame (per station)", HFILL } }, { &hf_turbocell_dst, { "Destination", "turbocell.dst", FT_ETHER, BASE_NONE, NULL, 0, "Seems to be the destination", HFILL } }, { &hf_turbocell_ip, { "IP", "turbocell.ip", FT_IPv4, BASE_NONE, NULL, 0, "IP address of base station ?", HFILL } }, { &hf_turbocell_unknown, { "Unknown", "turbocell.unknown", FT_UINT16, BASE_HEX, NULL, 0, "Always 0000", HFILL } }, { &hf_turbocell_timestamp, { "Timestamp (in 10 ms)", "turbocell.timestamp", FT_UINT24, BASE_DEC_HEX, NULL, 0, "Timestamp per station (since connection?)", HFILL } }, { &hf_turbocell_name, { "Network Name", "turbocell.name", FT_STRINGZ, BASE_NONE, NULL, 0, NULL, HFILL } }, { &hf_turbocell_station, { "Station", "turbocell.station", FT_ETHER, BASE_NONE, NULL, 0, "connected stations / satellites ?", HFILL }, } }; static hf_register_info aggregate_fields[] = { { &hf_turbocell_aggregate_msdu_header_text, {"MAC Service Data Unit (MSDU)", "turbocell_aggregate.msduheader", FT_UINT16, BASE_DEC, 0, 0x0000, NULL, HFILL } }, { &hf_turbocell_aggregate_msdu_len, {"MSDU length", "turbocell_aggregate.msdulen", FT_UINT16, BASE_DEC_HEX, 0, 0x0FFF, NULL, HFILL } }, { &hf_turbocell_aggregate_len, { "Total Length", "turbocell_aggregate.len", FT_UINT16, BASE_DEC_HEX, NULL, 0, "Total reported length", HFILL } }, { &hf_turbocell_aggregate_unknown1, { "Unknown", "turbocell_aggregate.unknown1", FT_UINT16, BASE_HEX, NULL, 0, "Always 0x7856", HFILL } }, { &hf_turbocell_aggregate_unknown2, { "Unknown", "turbocell_aggregate.unknown2", FT_UINT8, BASE_HEX, NULL, 0xF0, "have the values 0x4,0xC or 0x8", HFILL } }, }; static gint *ett[] = { &ett_turbocell, &ett_network, &ett_msdu_aggregation_parent_tree, &ett_msdu_aggregation_subframe_tree }; proto_turbocell = proto_register_protocol("Turbocell Header", "Turbocell", "turbocell"); proto_aggregate = proto_register_protocol("Turbocell Aggregate Data", "Turbocell Aggregate Data", "turbocell_aggregate"); proto_register_field_array(proto_aggregate, aggregate_fields, array_length(aggregate_fields)); register_dissector("turbocell", dissect_turbocell, proto_turbocell); proto_register_field_array(proto_turbocell, hf, array_length(hf)); proto_register_subtree_array(ett, array_length(ett)); } void proto_reg_handoff_turbocell(void) { eth_handle = find_dissector("eth_withoutfcs"); data_handle = find_dissector("data"); } /* * Editor modelines - http://www.wireshark.org/tools/modelines.html * * Local variables: * c-basic-offset: 4 * tab-width: 8 * indent-tabs-mode: nil * End: * * vi: set shiftwidth=4 tabstop=8 expandtab: * :indentSize=4:tabSize=8:noTabs=true: */