389 lines
14 KiB
C
389 lines
14 KiB
C
/* 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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* 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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* SPDX-License-Identifier: GPL-2.0-or-later
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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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* http://www.omniflux.com/devel/mikrotik/Mikrotik_MAC_Telnet_Procotol.txt
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*/
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#include "config.h"
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#include <epan/packet.h>
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#include <epan/to_str.h>
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void proto_register_mactelnet(void);
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void proto_reg_handoff_mactelnet(void);
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#define PROTO_TAG_MACTELNET "MAC-Telnet"
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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_control_packet = -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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#define MACTELNET_UDP_PORT 20561 /* Not IANA registered */
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/* Control packet definition */
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static const 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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/* 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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{ 4, "Ping request" },
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{ 5, "Ping response" },
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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, void *data _U_)
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{
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proto_item *mactelnet_item;
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proto_tree *mactelnet_tree;
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proto_item *mactelnet_control_item;
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proto_tree *mactelnet_control_tree;
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int foundping = -1;
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int foundclient = -1;
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int foundserver = -1;
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guint16 type;
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/* Check that there's enough data */
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if (tvb_captured_length(tvb) < 18)
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return 0;
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/* Get the type byte */
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type = tvb_get_guint8(tvb, 1);
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if ((type == 4) || (type == 5)) { /* Ping */
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foundping = 1;
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} else {
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int i = 0;
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while (clienttypenames[i].strptr != NULL) {
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if (tvb_get_ntohs(tvb, 14) == clienttypenames[i].value) {
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foundserver = i;
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break;
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}
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if (tvb_get_ntohs(tvb, 16) == clienttypenames[i].value) {
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foundclient = i;
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break;
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}
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i++;
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}
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}
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/* Not a mactelnet packet */
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if ((foundping < 0) && (foundclient < 0) && (foundserver < 0)) {
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return 0;
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}
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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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col_add_fstr(pinfo->cinfo, COL_INFO, "%s > %s Direction: %s Type: %s",
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tvb_ether_to_str(pinfo->pool, tvb, 2),
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tvb_ether_to_str(pinfo->pool, tvb, 8),
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((foundclient >= 0) || (type == 4) ? "Client->Server" : "Server->Client" ),
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val_to_str(type, packettypenames, "Unknown Type:0x%02x")
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);
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if (tree) {
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guint32 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, ENC_NA);
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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 += 1;
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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 += 1;
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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 (foundserver >= 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 if (foundclient >= 0) {
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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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} else if (foundping >= 0) {
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/* Skip empty data */
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offset += 4;
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}
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if (foundping < 0) {
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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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}
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/* Data packets only */
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if (type == 1) {
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while(tvb_reported_length_remaining(tvb, offset) > 0) {
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if ((tvb_reported_length_remaining(tvb, offset) > 4) && (tvb_get_ntohl(tvb, offset) == control_packet)) {
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guint8 datatype;
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guint32 datalength;
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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 magic number (4) */
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proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_packet, tvb, offset, 4, ENC_BIG_ENDIAN);
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offset += 4;
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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 += 1;
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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_ASCII);
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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_ASCII);
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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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proto_item_set_len (mactelnet_control_item, datalength + 9);
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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 = tvb_new_subset_remaining(tvb, offset);
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return call_data_dissector(next_client, pinfo, mactelnet_tree);
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}
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}
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} else if ((type == 4) || (type == 5)) {
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/* Data packet, let wireshark handle it */
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tvbuff_t *next_client = tvb_new_subset_remaining(tvb, offset);
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return call_data_dissector(next_client, pinfo, mactelnet_tree);
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}
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}
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return tvb_reported_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_control_packet,
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{ "Control Packet Magic Number", "mactelnet.control_packet",
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FT_UINT32, BASE_HEX, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_mactelnet_type,
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{ "Type", "mactelnet.type",
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FT_UINT8, BASE_DEC, VALS(packettypenames), 0x0,
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"Packet Type", HFILL }
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},
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{ &hf_mactelnet_protocolver,
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{ "Protocol Version", "mactelnet.protocol_version",
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FT_UINT8, BASE_DEC, NULL, 0x0,
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NULL, HFILL }
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},
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{ &hf_mactelnet_source_mac,
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{ "Source MAC", "mactelnet.source_mac",
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FT_ETHER, BASE_NONE, NULL , 0x0,
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NULL, HFILL }
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},
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{ &hf_mactelnet_destination_mac,
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{ "Destination MAC", "mactelnet.destination_mac",
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FT_ETHER, BASE_NONE, NULL , 0x0,
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NULL, HFILL }
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},
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{ &hf_mactelnet_session_id,
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{ "Session ID", "mactelnet.session_id",
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FT_UINT16, BASE_HEX, NULL , 0x0,
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"Session ID for this connection", HFILL }
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},
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{ &hf_mactelnet_client_type,
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{ "Client Type", "mactelnet.client_type",
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FT_UINT16, BASE_HEX, VALS(clienttypenames) , 0x0,
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NULL, HFILL }
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},
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{ &hf_mactelnet_databytes,
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{ "Session Data Bytes", "mactelnet.session_bytes",
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FT_UINT32, BASE_DEC, NULL , 0x0,
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"Session data bytes received", HFILL }
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},
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{ &hf_mactelnet_datatype,
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{ "Data Packet Type", "mactelnet.data_type",
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FT_UINT8, BASE_HEX, VALS(controlpackettypenames) , 0x0,
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NULL, HFILL }
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},
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{ &hf_mactelnet_control,
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{ "Control Packet", "mactelnet.control",
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FT_NONE, BASE_NONE, NULL , 0x0,
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NULL, HFILL }
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},
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{ &hf_mactelnet_control_length,
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{ "Control Data Length", "mactelnet.control_length",
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FT_UINT32, BASE_DEC, NULL , 0x0,
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"Control packet length", HFILL }
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},
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{ &hf_mactelnet_control_encryption_key,
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{ "Encryption Key", "mactelnet.control_encryptionkey",
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FT_BYTES, BASE_NONE, NULL , 0x0,
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"Login encryption key", HFILL }
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},
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{ &hf_mactelnet_control_password,
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{ "Password MD5", "mactelnet.control_password",
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FT_BYTES, BASE_NONE, NULL , 0x0,
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"Null padded MD5 password", HFILL }
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},
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{ &hf_mactelnet_control_username,
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{ "Username", "mactelnet.control_username",
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FT_STRING, BASE_NONE, NULL , 0x0,
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NULL, HFILL }
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},
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{ &hf_mactelnet_control_terminal,
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{ "Terminal Type", "mactelnet.control_terminaltype",
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FT_STRING, BASE_NONE, NULL , 0x0,
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NULL, HFILL }
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},
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{ &hf_mactelnet_control_width,
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{ "Terminal Width", "mactelnet.control_width",
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FT_UINT16, BASE_DEC, NULL , 0x0,
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NULL, HFILL }
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},
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{ &hf_mactelnet_control_height,
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{ "Terminal Height", "mactelnet.control_height",
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FT_UINT16, BASE_DEC, NULL , 0x0,
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NULL, HFILL }
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}
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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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register_dissector("mactelnet", dissect_mactelnet, proto_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_add_uint_with_preference("udp.port", MACTELNET_UDP_PORT, find_dissector("mactelnet"));
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}
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/*
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* Editor modelines - https://www.wireshark.org/tools/modelines.html
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*
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* Local variables:
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* c-basic-offset: 4
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* vi: set shiftwidth=4 tabstop=8 expandtab:
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* :indentSize=4:tabSize=8:noTabs=true:
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*/
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