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-rw-r--r--epan/dissectors/packet-mactelnet.c388
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diff --git a/epan/dissectors/packet-mactelnet.c b/epan/dissectors/packet-mactelnet.c
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+/* packet-mactelnet.c
+ * Routines for MAC-Telnet dissection
+ * Copyright 2010, Haakon Nessjoen <haakon.nessjoen@gmail.com>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+/*
+ * Thanks to "omniflux" for dissecting the protocol by hand before me.
+ * http://www.omniflux.com/devel/mikrotik/Mikrotik_MAC_Telnet_Procotol.txt
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/to_str.h>
+
+void proto_register_mactelnet(void);
+void proto_reg_handoff_mactelnet(void);
+
+#define PROTO_TAG_MACTELNET "MAC-Telnet"
+
+/* Initialize the protocol and registered fields */
+static gint proto_mactelnet = -1;
+static gint hf_mactelnet_control_packet = -1;
+static gint hf_mactelnet_type = -1;
+static gint hf_mactelnet_protocolver = -1;
+static gint hf_mactelnet_source_mac = -1;
+static gint hf_mactelnet_destination_mac = -1;
+static gint hf_mactelnet_session_id = -1;
+static gint hf_mactelnet_client_type = -1;
+static gint hf_mactelnet_databytes = -1;
+static gint hf_mactelnet_datatype = -1;
+static gint hf_mactelnet_control = -1;
+static gint hf_mactelnet_control_length = -1;
+static gint hf_mactelnet_control_encryption_key = -1;
+static gint hf_mactelnet_control_password = -1;
+static gint hf_mactelnet_control_username = -1;
+static gint hf_mactelnet_control_terminal = -1;
+static gint hf_mactelnet_control_width = -1;
+static gint hf_mactelnet_control_height = -1;
+
+#define MACTELNET_UDP_PORT 20561 /* Not IANA registered */
+
+/* Control packet definition */
+static const guint32 control_packet = 0x563412FF;
+
+/* Initialize the subtree pointers */
+static gint ett_mactelnet = -1;
+static gint ett_mactelnet_control = -1;
+
+/* Packet types */
+static const value_string packettypenames[] = {
+ { 0, "Start session" },
+ { 1, "Data" },
+ { 2, "Acknowledge" },
+ { 4, "Ping request" },
+ { 5, "Ping response" },
+ { 255, "End session" },
+ { 0, NULL }
+};
+
+/* Known client types */
+static const value_string clienttypenames[] = {
+ { 0x0015, "MAC Telnet" },
+ { 0x0f90, "Winbox" },
+ { 0, NULL }
+};
+
+/* Known control-packet types */
+static const value_string controlpackettypenames[] = {
+ { 0, "Begin authentication" },
+ { 1, "Encryption key" },
+ { 2, "Password" },
+ { 3, "Username" },
+ { 4, "Terminal type" },
+ { 5, "Terminal width" },
+ { 6, "Terminal height" },
+ { 9, "End authentication" },
+ { 0, NULL }
+};
+
+
+static int
+dissect_mactelnet(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
+{
+ proto_item *mactelnet_item;
+ proto_tree *mactelnet_tree;
+ proto_item *mactelnet_control_item;
+ proto_tree *mactelnet_control_tree;
+ int foundping = -1;
+ int foundclient = -1;
+ int foundserver = -1;
+ guint16 type;
+
+ /* Check that there's enough data */
+ if (tvb_captured_length(tvb) < 18)
+ return 0;
+
+ /* Get the type byte */
+ type = tvb_get_guint8(tvb, 1);
+
+ if ((type == 4) || (type == 5)) { /* Ping */
+ foundping = 1;
+ } else {
+ int i = 0;
+ while (clienttypenames[i].strptr != NULL) {
+ if (tvb_get_ntohs(tvb, 14) == clienttypenames[i].value) {
+ foundserver = i;
+ break;
+ }
+ if (tvb_get_ntohs(tvb, 16) == clienttypenames[i].value) {
+ foundclient = i;
+ break;
+ }
+ i++;
+ }
+ }
+
+ /* Not a mactelnet packet */
+ if ((foundping < 0) && (foundclient < 0) && (foundserver < 0)) {
+ return 0;
+ }
+
+ /* Make entries in Protocol column and Info column on summary display */
+ col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_TAG_MACTELNET);
+
+ col_add_fstr(pinfo->cinfo, COL_INFO, "%s > %s Direction: %s Type: %s",
+ tvb_ether_to_str(pinfo->pool, tvb, 2),
+ tvb_ether_to_str(pinfo->pool, tvb, 8),
+ ((foundclient >= 0) || (type == 4) ? "Client->Server" : "Server->Client" ),
+ val_to_str(type, packettypenames, "Unknown Type:0x%02x")
+ );
+
+ if (tree) {
+ guint32 offset = 0;
+
+ /* create display subtree for the protocol */
+ mactelnet_item = proto_tree_add_item(tree, proto_mactelnet, tvb, 0, -1, ENC_NA);
+ mactelnet_tree = proto_item_add_subtree(mactelnet_item, ett_mactelnet);
+
+ /* ver(1) */
+ proto_tree_add_item(mactelnet_tree, hf_mactelnet_protocolver, tvb, offset, 1, ENC_NA);
+ offset += 1;
+
+ /* ptype(1) */
+ proto_tree_add_item(mactelnet_tree, hf_mactelnet_type, tvb, offset, 1, ENC_NA);
+ offset += 1;
+
+ /* saddr(6) */
+ proto_tree_add_item(mactelnet_tree, hf_mactelnet_source_mac, tvb, offset, 6, ENC_NA);
+ offset += 6;
+
+ /* dstaddr(6) */
+ proto_tree_add_item(mactelnet_tree, hf_mactelnet_destination_mac, tvb, offset, 6, ENC_NA);
+ offset += 6;
+
+ if (foundserver >= 0) {
+ /* Server to client */
+
+ /* sessionid(2) */
+ proto_tree_add_item(mactelnet_tree, hf_mactelnet_session_id, tvb, offset+2, 2, ENC_BIG_ENDIAN);
+ offset += 2;
+
+ /* clienttype(2) */
+ proto_tree_add_item(mactelnet_tree, hf_mactelnet_client_type, tvb, offset-2, 2, ENC_BIG_ENDIAN);
+ offset += 2;
+ } else if (foundclient >= 0) {
+ /* Client to server */
+
+ /* sessionid(2) */
+ proto_tree_add_item(mactelnet_tree, hf_mactelnet_session_id, tvb, offset, 2, ENC_BIG_ENDIAN);
+ offset += 2;
+
+ /* clienttype(2) */
+ proto_tree_add_item(mactelnet_tree, hf_mactelnet_client_type, tvb, offset, 2, ENC_BIG_ENDIAN);
+ offset += 2;
+ } else if (foundping >= 0) {
+ /* Skip empty data */
+ offset += 4;
+ }
+
+ if (foundping < 0) {
+ /* counter(4) */
+ proto_tree_add_item(mactelnet_tree, hf_mactelnet_databytes, tvb, offset, 4, ENC_BIG_ENDIAN);
+ offset += 4;
+ }
+
+ /* Data packets only */
+ if (type == 1) {
+ while(tvb_reported_length_remaining(tvb, offset) > 0) {
+ if ((tvb_reported_length_remaining(tvb, offset) > 4) && (tvb_get_ntohl(tvb, offset) == control_packet)) {
+ guint8 datatype;
+ guint32 datalength;
+
+ /* Add subtree for control packet */
+ mactelnet_control_item = proto_tree_add_item(mactelnet_tree, hf_mactelnet_control, tvb, offset, -1, ENC_NA);
+ mactelnet_control_tree = proto_item_add_subtree(mactelnet_control_item, ett_mactelnet);
+ /* Control packet magic number (4) */
+ proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_packet, tvb, offset, 4, ENC_BIG_ENDIAN);
+ offset += 4;
+
+ /* Control packet type (1) */
+ datatype = tvb_get_guint8(tvb, offset);
+ proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_datatype, tvb, offset, 1, ENC_NA);
+ offset += 1;
+
+ /* Control packet length (4) */
+ datalength = tvb_get_ntohl(tvb, offset);
+ proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_length, tvb, offset, 4, ENC_BIG_ENDIAN);
+ offset += 4;
+
+ switch (datatype) {
+ case 1: /* Encryption Key */
+ proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_encryption_key, tvb, offset, datalength, ENC_NA);
+ break;
+
+ case 2: /* Password */
+ proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_password, tvb, offset, datalength, ENC_NA);
+ break;
+
+ case 3: /* Username */
+ proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_username, tvb, offset, datalength, ENC_ASCII);
+ break;
+
+ case 4: /* Terminal type */
+ proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_terminal, tvb, offset, datalength, ENC_ASCII);
+ break;
+
+ case 5: /* Terminal width */
+ proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_width, tvb, offset, 2, ENC_LITTLE_ENDIAN);
+ break;
+
+ case 6: /* Terminal height */
+ proto_tree_add_item(mactelnet_control_tree, hf_mactelnet_control_height, tvb, offset, 2, ENC_LITTLE_ENDIAN);
+ break;
+
+ case 9: /* End authentication (no data) */
+ break;
+ }
+ proto_item_set_len (mactelnet_control_item, datalength + 9);
+ offset += datalength;
+ } else {
+ /* Data packet, let wireshark handle it */
+ tvbuff_t *next_client = tvb_new_subset_remaining(tvb, offset);
+ return call_data_dissector(next_client, pinfo, mactelnet_tree);
+ }
+ }
+ } else if ((type == 4) || (type == 5)) {
+ /* Data packet, let wireshark handle it */
+ tvbuff_t *next_client = tvb_new_subset_remaining(tvb, offset);
+ return call_data_dissector(next_client, pinfo, mactelnet_tree);
+ }
+
+
+ }
+ return tvb_reported_length(tvb);
+}
+
+
+void
+proto_register_mactelnet(void)
+{
+ static hf_register_info hf[] = {
+ { &hf_mactelnet_control_packet,
+ { "Control Packet Magic Number", "mactelnet.control_packet",
+ FT_UINT32, BASE_HEX, NULL, 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mactelnet_type,
+ { "Type", "mactelnet.type",
+ FT_UINT8, BASE_DEC, VALS(packettypenames), 0x0,
+ "Packet Type", HFILL }
+ },
+ { &hf_mactelnet_protocolver,
+ { "Protocol Version", "mactelnet.protocol_version",
+ FT_UINT8, BASE_DEC, NULL, 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mactelnet_source_mac,
+ { "Source MAC", "mactelnet.source_mac",
+ FT_ETHER, BASE_NONE, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mactelnet_destination_mac,
+ { "Destination MAC", "mactelnet.destination_mac",
+ FT_ETHER, BASE_NONE, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mactelnet_session_id,
+ { "Session ID", "mactelnet.session_id",
+ FT_UINT16, BASE_HEX, NULL , 0x0,
+ "Session ID for this connection", HFILL }
+ },
+ { &hf_mactelnet_client_type,
+ { "Client Type", "mactelnet.client_type",
+ FT_UINT16, BASE_HEX, VALS(clienttypenames) , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mactelnet_databytes,
+ { "Session Data Bytes", "mactelnet.session_bytes",
+ FT_UINT32, BASE_DEC, NULL , 0x0,
+ "Session data bytes received", HFILL }
+ },
+ { &hf_mactelnet_datatype,
+ { "Data Packet Type", "mactelnet.data_type",
+ FT_UINT8, BASE_HEX, VALS(controlpackettypenames) , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mactelnet_control,
+ { "Control Packet", "mactelnet.control",
+ FT_NONE, BASE_NONE, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mactelnet_control_length,
+ { "Control Data Length", "mactelnet.control_length",
+ FT_UINT32, BASE_DEC, NULL , 0x0,
+ "Control packet length", HFILL }
+ },
+ { &hf_mactelnet_control_encryption_key,
+ { "Encryption Key", "mactelnet.control_encryptionkey",
+ FT_BYTES, BASE_NONE, NULL , 0x0,
+ "Login encryption key", HFILL }
+ },
+ { &hf_mactelnet_control_password,
+ { "Password MD5", "mactelnet.control_password",
+ FT_BYTES, BASE_NONE, NULL , 0x0,
+ "Null padded MD5 password", HFILL }
+ },
+ { &hf_mactelnet_control_username,
+ { "Username", "mactelnet.control_username",
+ FT_STRING, BASE_NONE, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mactelnet_control_terminal,
+ { "Terminal Type", "mactelnet.control_terminaltype",
+ FT_STRING, BASE_NONE, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mactelnet_control_width,
+ { "Terminal Width", "mactelnet.control_width",
+ FT_UINT16, BASE_DEC, NULL , 0x0,
+ NULL, HFILL }
+ },
+ { &hf_mactelnet_control_height,
+ { "Terminal Height", "mactelnet.control_height",
+ FT_UINT16, BASE_DEC, NULL , 0x0,
+ NULL, HFILL }
+ }
+ };
+
+ /* Setup protocol subtree array */
+ static gint *ett[] = {
+ &ett_mactelnet,
+ &ett_mactelnet_control,
+ };
+
+ /* Register the protocol name and description */
+ proto_mactelnet = proto_register_protocol ("MikroTik MAC-Telnet Protocol", PROTO_TAG_MACTELNET, "mactelnet");
+ register_dissector("mactelnet", dissect_mactelnet, proto_mactelnet);
+
+ /* Required function calls to register the header fields and subtrees used */
+ proto_register_field_array (proto_mactelnet, hf, array_length (hf));
+ proto_register_subtree_array (ett, array_length (ett));
+}
+
+void
+proto_reg_handoff_mactelnet(void)
+{
+ dissector_add_uint_with_preference("udp.port", MACTELNET_UDP_PORT, find_dissector("mactelnet"));
+}
+
+/*
+ * Editor modelines - https://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:
+ */
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