forked from osmocom/wireshark
From Håkon Nessjøen via bug 4899:
Dissector for Mikrotik RouterOS protocol for telneting without using IP addresses. From me: Code cleanup. svn path=/trunk/; revision=33289
This commit is contained in:
Stig Bjørlykke
parent
2e5c2b805f
commit
babe65cbab
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@ -718,6 +718,7 @@ set(DISSECTOR_SRC
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dissectors/packet-m2ua.c
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dissectors/packet-m3ua.c
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dissectors/packet-mac-lte.c
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dissectors/packet-mactelnet.c
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dissectors/packet-maccontrol.c
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dissectors/packet-manolito.c
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dissectors/packet-mbtcp.c
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@ -631,6 +631,7 @@ DISSECTOR_SRC = \
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packet-m2ua.c \
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packet-m3ua.c \
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packet-mac-lte.c \
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packet-mactelnet.c \
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packet-maccontrol.c \
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packet-manolito.c \
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packet-mbtcp.c \
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@ -0,0 +1,328 @@
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/* packet-mactelnet.c
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* Routines for MAC-Telnet dissection
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* Copyright 2010, Haakon Nessjoen <haakon.nessjoen@gmail.com>
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*
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* $Id$
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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 modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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/*
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* Thanks to "omniflux" for dissecting the protocol by hand before me.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <glib.h>
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#include <string.h>
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#include <epan/packet.h>
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#include <epan/prefs.h>
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#include <epan/addr_resolv.h>
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#define PROTO_TAG_MACTELNET "MAC-Telnet"
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void proto_reg_handoff_mactelnet(void);
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/* Initialize the protocol and registered fields */
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static gint proto_mactelnet = -1;
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static gint hf_mactelnet = -1;
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static gint hf_mactelnet_type = -1;
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static gint hf_mactelnet_protocolver = -1;
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static gint hf_mactelnet_source_mac = -1;
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static gint hf_mactelnet_destination_mac = -1;
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static gint hf_mactelnet_session_id = -1;
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static gint hf_mactelnet_client_type = -1;
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static gint hf_mactelnet_databytes = -1;
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static gint hf_mactelnet_datatype = -1;
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static gint hf_mactelnet_control = -1;
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static gint hf_mactelnet_control_length = -1;
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static gint hf_mactelnet_control_encryption_key = -1;
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static gint hf_mactelnet_control_password = -1;
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static gint hf_mactelnet_control_username = -1;
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static gint hf_mactelnet_control_terminal = -1;
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static gint hf_mactelnet_control_width = -1;
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static gint hf_mactelnet_control_height = -1;
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/* Global port pref */
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static int global_mactelnet_port = 20561;
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/* Control packet definition */
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static guint32 control_packet = 0x563412FF;
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/* Initialize the subtree pointers */
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static gint ett_mactelnet = -1;
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static gint ett_mactelnet_control = -1;
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static dissector_handle_t data_handle;
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/* Packet types */
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static const value_string packettypenames[] = {
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{ 0, "Start session" },
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{ 1, "Data" },
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{ 2, "Acknowledge" },
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{ 255, "End session" },
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{ 0, NULL }
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};
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/* Known client types */
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static const value_string clienttypenames[] = {
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{ 0x0015, "MAC Telnet" },
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{ 0x0f90, "Winbox" },
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{ 0, NULL }
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};
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/* Known control-packet types */
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static const value_string controlpackettypenames[] = {
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{ 0, "Begin authentication" },
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{ 1, "Encryption key" },
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{ 2, "Password" },
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{ 3, "Username" },
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{ 4, "Terminal type" },
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{ 5, "Terminal width" },
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{ 6, "Terminal height" },
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{ 9, "End authentication" },
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{ 0, NULL }
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};
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static int
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dissect_mactelnet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *mactelnet_item = NULL;
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proto_tree *mactelnet_tree = NULL;
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proto_item *mactelnet_control_item = NULL;
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proto_tree *mactelnet_control_tree = NULL;
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guint16 type = 0;
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/* Check that there's enough data */
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if (tvb_length(tvb) < 22)
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return 0;
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/* Make entries in Protocol column and Info column on summary display */
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col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_TAG_MACTELNET);
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/* Get the type byte */
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type = tvb_get_guint8(tvb, 1);
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col_clear(pinfo->cinfo, COL_INFO);
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col_add_fstr(pinfo->cinfo, COL_INFO, "%s > %s Type: %s",
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ether_to_str(tvb_get_ptr(tvb, 2, 6)), ether_to_str(tvb_get_ptr(tvb, 8, 6)),
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val_to_str(type, packettypenames, "Unknown Type:0x%02x"));
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if (tree) {
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guint8 no_ip[4] = {0,0,0,0};
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guint8 offset = 0;
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/* create display subtree for the protocol */
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mactelnet_item = proto_tree_add_item(tree, proto_mactelnet, tvb, 0, -1, FALSE);
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mactelnet_tree = proto_item_add_subtree(mactelnet_item, ett_mactelnet);
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/* ver(1) */
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proto_tree_add_item(mactelnet_tree, hf_mactelnet_protocolver, tvb, offset, 1, ENC_NA);
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offset++;
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/* ptype(1) */
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proto_tree_add_item(mactelnet_tree, hf_mactelnet_type, tvb, offset, 1, ENC_NA);
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offset++;
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/* saddr(6) */
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proto_tree_add_item(mactelnet_tree, hf_mactelnet_source_mac, tvb, offset, 6, ENC_NA);
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offset += 6;
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/* dstaddr(6) */
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proto_tree_add_item(mactelnet_tree, hf_mactelnet_destination_mac, tvb, offset, 6, ENC_NA);
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offset += 6;
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if (memcmp(pinfo->src.data, &no_ip, 4) == 0) {
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/* Server to client */
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/* sessionid(2) */
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proto_tree_add_item(mactelnet_tree, hf_mactelnet_session_id, tvb, offset+2, 2, ENC_BIG_ENDIAN);
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offset += 2;
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/* clienttype(2) */
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proto_tree_add_item(mactelnet_tree, hf_mactelnet_client_type, tvb, offset-2, 2, ENC_BIG_ENDIAN);
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offset += 2;
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} else {
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/* Client to server */
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/* sessionid(2) */
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proto_tree_add_item(mactelnet_tree, hf_mactelnet_session_id, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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/* clienttype(2) */
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proto_tree_add_item(mactelnet_tree, hf_mactelnet_client_type, tvb, offset, 2, ENC_BIG_ENDIAN);
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offset += 2;
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}
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/* counter(4) */
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proto_tree_add_item(mactelnet_tree, hf_mactelnet_databytes, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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/* Data packets only */
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if (type == 1) {
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while(tvb_length_remaining(tvb, offset) > 0) {
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if (tvb_length_remaining(tvb, offset) > 4 && tvb_get_ntohl(tvb, offset) == control_packet) {
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guint8 datatype = 0;
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guint32 datalength = 0;
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offset += 4;
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/* Add subtree for control packet */
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mactelnet_control_item = proto_tree_add_item(mactelnet_tree, hf_mactelnet_control, tvb, offset, -1, ENC_NA);
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mactelnet_control_tree = proto_item_add_subtree(mactelnet_control_item, ett_mactelnet);
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/* Control packet type (1) */
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datatype = tvb_get_guint8(tvb, offset);
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proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_datatype, tvb, offset, 1, ENC_NA);
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offset++;
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/* Control packet length (4) */
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datalength = tvb_get_ntohl(tvb, offset);
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proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_length, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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switch (datatype) {
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case 1: /* Encryption Key */
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proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_encryption_key, tvb, offset, datalength, ENC_NA);
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break;
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case 2: /* Password */
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proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_password, tvb, offset, datalength, ENC_NA);
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break;
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case 3: /* Username */
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proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_username, tvb, offset, datalength, ENC_NA);
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break;
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case 4: /* Terminal type */
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proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_terminal, tvb, offset, datalength, ENC_NA);
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break;
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case 5: /* Terminal width */
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proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_width, tvb, offset, 2, ENC_LITTLE_ENDIAN);
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break;
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case 6: /* Terminal height */
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proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_height, tvb, offset, 2, ENC_LITTLE_ENDIAN);
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break;
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case 9: /* End authentication (no data) */
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break;
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}
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offset += datalength;
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} else {
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/* Data packet, let wireshark handle it */
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tvbuff_t *next_client;
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next_client = tvb_new_subset(tvb, offset, -1, -1);
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call_dissector(data_handle, next_client, pinfo, mactelnet_tree);
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return offset;
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}
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}
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}
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}
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return tvb_length(tvb);
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}
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void
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proto_register_mactelnet(void)
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{
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static hf_register_info hf[] = {
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{ &hf_mactelnet,
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{ "Data", "mactelnet.data", FT_NONE, BASE_NONE, NULL, 0x0,
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"MAC-Telnet Data", HFILL }},
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{ &hf_mactelnet_type,
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{ "Type", "mactelnet.type", FT_UINT8, BASE_DEC, VALS(packettypenames), 0x0,
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"Package Type", HFILL }},
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{ &hf_mactelnet_protocolver,
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{ "Protocol Version", "mactelnet.protocol_version", FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }},
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{ &hf_mactelnet_source_mac,
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{ "Source MAC", "mactelnet.source_mac", FT_ETHER, BASE_NONE, NULL , 0x0,
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NULL, HFILL }},
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{ &hf_mactelnet_destination_mac,
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{ "Destination MAC", "mactelnet.destination_mac", FT_ETHER, BASE_NONE, NULL , 0x0,
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NULL, HFILL }},
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{ &hf_mactelnet_session_id,
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{ "Session ID", "mactelnet.session_id", FT_UINT16, BASE_HEX, NULL , 0x0,
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"Session ID for this connection", HFILL }},
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{ &hf_mactelnet_client_type,
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{ "Client Type", "mactelnet.client_type", FT_UINT16, BASE_HEX, VALS(clienttypenames) , 0x0,
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NULL, HFILL }},
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{ &hf_mactelnet_databytes,
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{ "Session Data Bytes", "mactelnet.session_bytes", FT_UINT32, BASE_DEC, NULL , 0x0,
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"Session data bytes received", HFILL }},
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{ &hf_mactelnet_datatype,
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{ "Data Packet Type", "mactelnet.data_type", FT_UINT8, BASE_HEX, VALS(controlpackettypenames) , 0x0,
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NULL, HFILL }},
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{ &hf_mactelnet_control,
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{ "Control Packet", "mactelnet.control", FT_NONE, BASE_NONE, NULL , 0x0,
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NULL, HFILL }},
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{ &hf_mactelnet_control_length,
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{ "Control Data Length", "mactelnet.control_length", FT_UINT32, BASE_DEC, NULL , 0x0,
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"Control packet length", HFILL }},
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{ &hf_mactelnet_control_encryption_key,
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{ "Encryption Key", "mactelnet.control_encryptionkey", FT_BYTES, BASE_NONE, NULL , 0x0,
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"Login encryption key", HFILL }},
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{ &hf_mactelnet_control_password,
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{ "Password MD5", "mactelnet.control_password", FT_BYTES, BASE_NONE, NULL , 0x0,
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NULL, HFILL }},
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{ &hf_mactelnet_control_username,
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{ "Username", "mactelnet.control_username", FT_STRING, BASE_NONE, NULL , 0x0,
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NULL, HFILL }},
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{ &hf_mactelnet_control_terminal,
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{ "Terminal Type", "mactelnet.control_terminaltype", FT_STRING, BASE_NONE, NULL , 0x0,
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NULL, HFILL }},
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{ &hf_mactelnet_control_width,
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{ "Terminal Width", "mactelnet.control_width", FT_UINT16, BASE_DEC, NULL , 0x0,
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NULL, HFILL }},
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{ &hf_mactelnet_control_height,
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{ "Terminal Height", "mactelnet.control_height", FT_UINT16, BASE_DEC, NULL , 0x0,
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NULL, HFILL }}
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};
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/* Setup protocol subtree array */
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static gint *ett[] = {
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&ett_mactelnet,
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&ett_mactelnet_control,
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};
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/* Register the protocol name and description */
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proto_mactelnet = proto_register_protocol ("MikroTik MAC-Telnet Protocol", PROTO_TAG_MACTELNET, "mactelnet");
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/* Required function calls to register the header fields and subtrees used */
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proto_register_field_array (proto_mactelnet, hf, array_length (hf));
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proto_register_subtree_array (ett, array_length (ett));
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}
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void
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proto_reg_handoff_mactelnet(void)
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{
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dissector_handle_t mactelnet_handle;
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mactelnet_handle = new_create_dissector_handle(dissect_mactelnet,
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proto_mactelnet);
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dissector_add("udp.port", global_mactelnet_port, mactelnet_handle);
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data_handle = find_dissector("data");
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}
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