419 lines
11 KiB
C
419 lines
11 KiB
C
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/* packet-mint.c
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* Routines for the disassembly of the Chantry/HiPath AP-Controller
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* tunneling protocol.
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*
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* $Id$
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*
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* Copyright 2013 Joerg Mayer (see AUTHORS file)
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* Motorola/Symbol WLAN proprietary protocol
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* http://www.awimobility.com/s.nl/ctype.KB/it.I/id.7761/KB.81/.f
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* looks like a mixture of lwapp/capwap and is-is/ospf
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*/
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/* We don't want the tranported data to pollute the output until
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* we know how to correctly determine the packet type and length
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*/
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#define DEVELOPMENT 1
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#include "config.h"
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/etypes.h>
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#include <epan/wmem/wmem.h>
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#include <epan/expert.h>
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#include <epan/show_exception.h>
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/* protocol handles */
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static int proto_mint = -1;
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static dissector_handle_t eth_handle;
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/* ett handles */
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static int ett_mint_control = -1;
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static int ett_mint_data = -1;
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static int ett_mint_eth = -1;
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/* hf elements */
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/* MiNT Control */
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static int hf_mint_control_unknown1 = -1;
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/* MiNT Data */
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static int hf_mint_data_unknown1 = -1;
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static int hf_mint_data_unknown2 = -1;
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static int hf_mint_data_seqno = -1;
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/* MiNT Eth */
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static int hf_mint_eth_unknown = -1;
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static int hf_mint_eth_length = -1;
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static int hf_mint_eth_unknown1 = -1;
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/* MiNT common */
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static int hf_mint_header_unknown1 = -1;
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static int hf_mint_header_unknown2 = -1;
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static int hf_mint_header_unknown3 = -1;
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static int hf_mint_header_srcid = -1;
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static int hf_mint_header_dstid = -1;
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static int hf_mint_header_srcdatatype = -1;
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static int hf_mint_header_dstdatatype = -1;
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#define PROTO_SHORT_NAME "MiNT"
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#define PROTO_LONG_NAME "Media indepentend Network Transport"
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#define PORT_MINT_CONTROL_TUNNEL 24576
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#define PORT_MINT_DATA_TUNNEL 24577
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typedef enum {
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MINT_TYPE_DATA_0x01 = 0x01,
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MINT_TYPE_DATA_0x02 = 0x02,
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MINT_TYPE_CTRL_0x0c = 0x0c,
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MINT_TYPE_CTRL_0x0e = 0x0e,
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MINT_TYPE_CTRL_0x1e = 0x1e,
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MINT_TYPE_ETH_0x22 = 0x22
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} mint_packettype_t;
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static const value_string mint_packettype_vals[] = {
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{ MINT_TYPE_DATA_0x01, "Unicast data"},
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{ MINT_TYPE_DATA_0x02, "BC/MC data"},
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{ MINT_TYPE_CTRL_0x0c, "Ctrl_0x0c"},
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{ MINT_TYPE_CTRL_0x0e, "Ctrl_0x0e"},
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{ MINT_TYPE_CTRL_0x1e, "Ctrl_0x1e"},
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{ MINT_TYPE_ETH_0x22, "Eth_0x22"},
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{ 0, NULL }
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};
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static int
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dissect_eth(tvbuff_t *tvb, packet_info *pinfo, proto_tree *mint_tree,
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volatile guint32 offset, guint32 length)
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{
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tvbuff_t *eth_tvb;
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#ifdef DEVELOPMENT
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col_set_writable(pinfo->cinfo, FALSE);
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#endif
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eth_tvb = tvb_new_subset(tvb, offset, length, length);
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/* Continue after Ethernet dissection errors */
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TRY {
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call_dissector(eth_handle, eth_tvb, pinfo, mint_tree);
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} CATCH_NONFATAL_ERRORS {
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show_exception(eth_tvb, pinfo, mint_tree, EXCEPT_CODE, GET_MESSAGE);
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} ENDTRY;
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offset += length;
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#ifdef DEVELOPMENT
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col_set_writable(pinfo->cinfo, TRUE);
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#endif
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return offset;
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}
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static int
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dissect_mint_common(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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guint32 offset, guint32 packet_length, guint received_via _U_)
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{
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proto_item *ti;
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proto_tree *mint_tree = NULL;
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guint16 header_remain;
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guint16 packet_type;
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if (!tree)
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return packet_length;
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packet_type = tvb_get_ntohs(tvb, offset + 12);
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col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_SHORT_NAME);
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col_add_str(pinfo->cinfo, COL_INFO, val_to_str(packet_type,
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mint_packettype_vals, "Type 0x%02x"));
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ti = proto_tree_add_item(tree, proto_mint, tvb, offset, -1,
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ENC_NA);
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mint_tree = proto_item_add_subtree(ti, ett_mint_data);
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/* MiNT header */
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proto_tree_add_item(mint_tree, hf_mint_header_unknown1, tvb, offset, 4,
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ENC_NA);
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offset += 4;
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proto_tree_add_item(mint_tree, hf_mint_header_dstid, tvb, offset, 4,
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ENC_NA);
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offset += 4;
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proto_tree_add_item(mint_tree, hf_mint_header_srcid, tvb, offset, 4,
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ENC_NA);
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offset += 4;
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proto_tree_add_item(mint_tree, hf_mint_header_dstdatatype, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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offset += 2;
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proto_tree_add_item(mint_tree, hf_mint_header_srcdatatype, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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offset += 2;
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/* FIXME: This is probably not the right way to determine the packet type.
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* It's more likely something in mint_header_unknown1 but I haven't
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* found out what. */
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switch(packet_type) {
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case 1:
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proto_tree_add_item(mint_tree, hf_mint_data_unknown1, tvb, offset, 2,
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ENC_NA);
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offset += 2;
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/* Transported user frame */
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if (offset < packet_length)
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offset += dissect_eth(tvb, pinfo, tree, offset, packet_length - offset);
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break;
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case 2:
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/* The only observed values in my traces are 0f:c8 and 0f:ca.
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* The traffic with 0f:ca seems to be subjected to guestportal
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* and NAT. */
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proto_tree_add_item(mint_tree, hf_mint_data_unknown1, tvb, offset, 2,
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ENC_NA);
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offset += 2;
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proto_tree_add_item(mint_tree, hf_mint_data_seqno, tvb, offset, 4,
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ENC_NA);
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offset += 4;
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proto_tree_add_item(mint_tree, hf_mint_data_unknown2, tvb, offset, 4,
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ENC_NA);
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offset += 4;
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/* Transported user frame */
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if (offset < packet_length)
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offset += dissect_eth(tvb, pinfo, tree, offset, packet_length - offset);
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break;
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default:
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header_remain = packet_length - offset;
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proto_tree_add_item(mint_tree, hf_mint_data_unknown1, tvb, offset, header_remain,
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ENC_NA);
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offset += header_remain;
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break;
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}
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return offset;
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}
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static int
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dissect_mint_control(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint32 packet_length = tvb_length_remaining(tvb, 0);
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return dissect_mint_common(tvb, pinfo, tree, 0, packet_length,
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PORT_MINT_CONTROL_TUNNEL);
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;
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}
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static int
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dissect_mint_data(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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guint32 packet_length = tvb_length_remaining(tvb, 0);
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return dissect_mint_common(tvb, pinfo, tree, 0, packet_length,
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PORT_MINT_DATA_TUNNEL);
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}
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static int
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dissect_mint_eth(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti;
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proto_tree *mint_eth_tree = NULL;
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guint32 offset = 0;
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guint32 packet_length;
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ti = proto_tree_add_item(tree, proto_mint, tvb, offset, 4,
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ENC_NA);
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mint_eth_tree = proto_item_add_subtree(ti, ett_mint_eth);
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proto_tree_add_item(mint_eth_tree, hf_mint_eth_unknown, tvb, offset, 2,
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ENC_NA);
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offset += 2;
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proto_tree_add_item(mint_eth_tree, hf_mint_eth_length, tvb, offset, 2,
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ENC_BIG_ENDIAN);
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packet_length = tvb_get_ntohs(tvb, offset) + 4;
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offset += 2;
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return dissect_mint_common(tvb, pinfo, tree, 4, packet_length, ETHERTYPE_MINT);
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}
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static gboolean
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test_mint_control(tvbuff_t *tvb _U_)
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{
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#if 0
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/* Minimum of 8 bytes, first byte (version) has value of 3 */
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if ( tvb_length(tvb) < 8
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|| tvb_get_guint8(tvb, 0) != 3
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/* || tvb_get_guint8(tvb, 2) != 0
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|| tvb_get_ntohs(tvb, 6) > tvb_reported_length(tvb) */
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) {
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return FALSE;
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}
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#endif
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return TRUE;
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}
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static gboolean
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test_mint_data(tvbuff_t *tvb _U_)
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{
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#if 0
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/* Minimum of 8 bytes, first byte (version) has value of 3 */
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if ( tvb_length(tvb) < 8
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|| tvb_get_guint8(tvb, 0) != 3
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/* || tvb_get_guint8(tvb, 2) != 0
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|| tvb_get_ntohs(tvb, 6) > tvb_reported_length(tvb) */
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) {
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return FALSE;
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}
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#endif
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return TRUE;
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}
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static gboolean
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test_mint_eth(tvbuff_t *tvb _U_)
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{
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#if 0
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/* Minimum of 8 bytes, first byte (version) has value of 3 */
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if ( tvb_length(tvb) < 8
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|| tvb_get_guint8(tvb, 0) != 3
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/* || tvb_get_guint8(tvb, 2) != 0
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|| tvb_get_ntohs(tvb, 6) > tvb_reported_length(tvb) */
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) {
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return FALSE;
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}
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#endif
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return TRUE;
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}
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static int
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dissect_mint_control_static(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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if ( !test_mint_control(tvb) ) {
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return 0;
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}
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return dissect_mint_control(tvb, pinfo, tree);
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}
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static int
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dissect_mint_data_static(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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if ( !test_mint_data(tvb) ) {
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return 0;
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}
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return dissect_mint_data(tvb, pinfo, tree);
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}
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static int
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dissect_mint_eth_static(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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{
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if ( !test_mint_eth(tvb) ) {
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return 0;
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}
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return dissect_mint_eth(tvb, pinfo, tree);
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}
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void
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proto_register_mint(void)
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{
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static hf_register_info hf[] = {
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/* MiNT Control */
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{ &hf_mint_control_unknown1,
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{ "Unknown1", "mint.control.unknown1", FT_BYTES, BASE_NONE, NULL,
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0x0, NULL, HFILL }},
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/* MiNT Data */
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{ &hf_mint_data_seqno,
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{ "Seqence Number", "mint.data.seqno", FT_UINT32, BASE_DEC, NULL,
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0x0, NULL, HFILL }},
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{ &hf_mint_data_unknown1,
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{ "Unknown1", "mint.data.unknown1", FT_BYTES, BASE_NONE, NULL,
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0x0, NULL, HFILL }},
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{ &hf_mint_data_unknown2,
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{ "Unknown2", "mint.data.unknown2", FT_BYTES, BASE_NONE, NULL,
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0x0, NULL, HFILL }},
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/* MiNT Eth */
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{ &hf_mint_eth_unknown,
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{ "Unknown", "mint.eth.unknown", FT_BYTES, BASE_NONE, NULL,
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0x0, NULL, HFILL }},
|
||
|
|
|
||
|
|
{ &hf_mint_eth_length,
|
||
|
|
{ "Length", "mint.eth.length", FT_UINT16, BASE_DEC, NULL,
|
||
|
|
0x0, NULL, HFILL }},
|
||
|
|
|
||
|
|
{ &hf_mint_eth_unknown1,
|
||
|
|
{ "Unknown1", "mint.eth.unknown1", FT_BYTES, BASE_NONE, NULL,
|
||
|
|
0x0, NULL, HFILL }},
|
||
|
|
|
||
|
|
/* MiNT common */
|
||
|
|
{ &hf_mint_header_unknown1,
|
||
|
|
{ "Unknown1", "mint.header.unknown1", FT_BYTES, BASE_NONE, NULL,
|
||
|
|
0x0, NULL, HFILL }},
|
||
|
|
|
||
|
|
{ &hf_mint_header_unknown2,
|
||
|
|
{ "Unknown2", "mint.header.unknown2", FT_BYTES, BASE_NONE, NULL,
|
||
|
|
0x0, NULL, HFILL }},
|
||
|
|
|
||
|
|
{ &hf_mint_header_unknown3,
|
||
|
|
{ "Unknown3", "mint.header.unknown3", FT_BYTES, BASE_NONE, NULL,
|
||
|
|
0x0, NULL, HFILL }},
|
||
|
|
|
||
|
|
{ &hf_mint_header_srcid,
|
||
|
|
{ "Src MiNT ID", "mint.header.srcid", FT_BYTES, BASE_NONE, NULL,
|
||
|
|
0x0, NULL, HFILL }},
|
||
|
|
|
||
|
|
{ &hf_mint_header_dstid,
|
||
|
|
{ "Dst MiNT ID", "mint.header.dstid", FT_BYTES, BASE_NONE, NULL,
|
||
|
|
0x0, NULL, HFILL }},
|
||
|
|
|
||
|
|
{ &hf_mint_header_srcdatatype,
|
||
|
|
{ "Src type", "mint.header.srctype", FT_UINT16, BASE_DEC, VALS(mint_packettype_vals),
|
||
|
|
0x0, NULL, HFILL }},
|
||
|
|
|
||
|
|
{ &hf_mint_header_dstdatatype,
|
||
|
|
{ "Dst type", "mint.header.dsttype", FT_UINT16, BASE_DEC, VALS(mint_packettype_vals),
|
||
|
|
0x0, NULL, HFILL }},
|
||
|
|
|
||
|
|
};
|
||
|
|
static gint *ett[] = {
|
||
|
|
&ett_mint_control,
|
||
|
|
&ett_mint_data,
|
||
|
|
&ett_mint_eth,
|
||
|
|
};
|
||
|
|
|
||
|
|
proto_mint = proto_register_protocol(PROTO_LONG_NAME, PROTO_SHORT_NAME, "mint");
|
||
|
|
proto_register_field_array(proto_mint, hf, array_length(hf));
|
||
|
|
proto_register_subtree_array(ett, array_length(ett));
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
proto_reg_handoff_mint(void)
|
||
|
|
{
|
||
|
|
dissector_handle_t mint_control_handle;
|
||
|
|
dissector_handle_t mint_data_handle;
|
||
|
|
dissector_handle_t mint_eth_handle;
|
||
|
|
|
||
|
|
mint_control_handle = new_create_dissector_handle(dissect_mint_control_static, proto_mint);
|
||
|
|
mint_data_handle = new_create_dissector_handle(dissect_mint_data_static, proto_mint);
|
||
|
|
mint_eth_handle = new_create_dissector_handle(dissect_mint_eth_static, proto_mint);
|
||
|
|
|
||
|
|
dissector_add_uint("udp.port", PORT_MINT_CONTROL_TUNNEL, mint_control_handle);
|
||
|
|
dissector_add_uint("udp.port", PORT_MINT_DATA_TUNNEL, mint_data_handle);
|
||
|
|
dissector_add_uint("ethertype", ETHERTYPE_MINT, mint_eth_handle);
|
||
|
|
|
||
|
|
eth_handle = find_dissector("eth_withoutfcs");
|
||
|
|
}
|
||
|
|
|