2012-10-22 12:49:04 +00:00
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/* packet-btsmp.c
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* Routines for Bluetooth Security Manager Protocol dissection
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*
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* Copyright 2012, Allan M. Madsen <allan.m@madsen.dk>
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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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* 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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#include "config.h"
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#include <epan/packet.h>
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#include "packet-btl2cap.h"
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/* Initialize the protocol and registered fields */
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static int proto_btsmp = -1;
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static int hf_btsmp_opcode = -1;
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static int hf_btsmp_io_capabilities = -1;
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static int hf_btsmp_oob_data_flags = -1;
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static int hf_btsmp_reason = -1;
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static int hf_btsmp_cfm_value = -1;
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static int hf_btsmp_random = -1;
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static int hf_btsmp_long_term_key = -1;
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static int hf_btsmp_id_resolving_key = -1;
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static int hf_btsmp_signature_key = -1;
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static int hf_btsmp_bonding_flags = -1;
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static int hf_btsmp_mitm_flag = -1;
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static int hf_btsmp_max_enc_key_size = -1;
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static int hf_btsmp_key_dist_enc = -1;
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static int hf_btsmp_key_dist_id = -1;
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static int hf_btsmp_key_dist_sign = -1;
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static int hf_btsmp_ediv = -1;
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/* Initialize the subtree pointers */
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static gint ett_btsmp = -1;
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static gint ett_btsmp_auth_req = -1;
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static gint ett_btsmp_key_dist = -1;
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/* Opcodes */
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static const value_string opcode_vals[] = {
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{0x01, "Pairing Request"},
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{0x02, "Pairing Response"},
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{0x03, "Pairing Confirm"},
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{0x04, "Pairing Random"},
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{0x05, "Pairing Failed"},
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{0x06, "Encryption Information"},
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{0x07, "Master Identification"},
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{0x08, "Identity Information"},
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{0x09, "Identity Address Information"},
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{0x0a, "Signing Information"},
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{0x0b, "Security Request"},
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{0x0, NULL}
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};
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/* IO capabilities */
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static const value_string io_capability_vals[] = {
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{0x00, "Display Only"},
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{0x01, "Display Yes/No"},
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{0x02, "Keyboard Only"},
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{0x03, "No Input, No Output"},
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{0x04, "Keyboard, Display"},
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{0x0, NULL}
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};
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/* OOB Data present Flag */
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static const value_string oob_data_flag_vals[] = {
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{0x00, "OOB Auth. Data Not Present"},
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{0x01, "OOB Auth. Data From Remote Device Present"},
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{0x0, NULL}
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};
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/* Bonding flags */
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static const value_string bonding_flag_vals[] = {
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{0x00, "No Bonding"},
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{0x01, "Bonding"},
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{0x0, NULL}
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};
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/* Reason codes */
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static const value_string reason_vals[] = {
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{0x01, "Passkey Entry Failed"},
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{0x02, "OOB Not Available"},
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{0x03, "Authentication Requirements"},
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{0x04, "Confirm Value Failed"},
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{0x05, "Pairing Not Supported"},
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{0x06, "Encryption Key Size"},
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{0x07, "Command Not Supported"},
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{0x08, "Unspecified Reason"},
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{0x09, "Repeated Attempts"},
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{0x0a, "Invalid Parameters"},
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{0x0, NULL}
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};
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2013-03-19 13:51:52 +00:00
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void proto_register_btsmp(void);
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void proto_reg_handoff_btsmp(void);
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2012-10-22 12:49:04 +00:00
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static int
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dissect_btsmp_auth_req(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree)
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{
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proto_item *ti_param;
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proto_tree *st_param;
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guint8 param;
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param = tvb_get_guint8(tvb, offset);
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2013-03-19 13:51:52 +00:00
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ti_param = proto_tree_add_text(tree, tvb, offset, 1, "AuthReq: ");
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st_param = proto_item_add_subtree(ti_param, ett_btsmp_auth_req);
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2012-10-22 12:49:04 +00:00
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proto_tree_add_item(st_param, hf_btsmp_bonding_flags, tvb, offset, 1, ENC_LITTLE_ENDIAN);
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2013-03-19 13:51:52 +00:00
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proto_item_append_text(ti_param, "%s, ", val_to_str_const(param & 0x03, bonding_flag_vals, "<unknown>"));
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2012-10-22 12:49:04 +00:00
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proto_tree_add_item(st_param, hf_btsmp_mitm_flag, tvb, offset, 1, ENC_LITTLE_ENDIAN);
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2013-03-19 13:51:52 +00:00
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proto_item_append_text(ti_param, "%s", (param & 0x04) ? "MITM" : "No MITM");
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2012-10-22 12:49:04 +00:00
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2013-03-19 13:51:52 +00:00
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col_append_fstr(pinfo->cinfo, COL_INFO, "%s, %s", val_to_str_const(param & 0x03, bonding_flag_vals, "<unknown>"), (param & 0x04) ? "MITM" : "No MITM");
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2012-10-22 12:49:04 +00:00
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2013-03-19 13:51:52 +00:00
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return offset + 1;
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2012-10-22 12:49:04 +00:00
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}
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static int
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dissect_btsmp_key_dist(tvbuff_t *tvb, int offset, packet_info *pinfo, proto_tree *tree, gboolean initiator)
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{
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proto_item *ti_param;
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proto_tree *st_param;
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guint8 param;
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2013-03-19 13:51:52 +00:00
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2012-10-22 12:49:04 +00:00
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param = tvb_get_guint8(tvb, offset);
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2013-03-19 13:51:52 +00:00
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if (initiator) {
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2012-10-22 12:49:04 +00:00
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Initiator Key(s): ");
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2013-03-19 13:51:52 +00:00
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ti_param = proto_tree_add_text(tree, tvb, offset, 1, "Initiator Key Distribution: ");
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2012-10-22 12:49:04 +00:00
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}
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else {
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col_append_fstr(pinfo->cinfo, COL_INFO, ", Responder Key(s): ");
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2013-03-19 13:51:52 +00:00
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ti_param = proto_tree_add_text(tree, tvb, offset, 1, "Responder Key Distribution: ");
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2012-10-22 12:49:04 +00:00
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}
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2013-03-19 13:51:52 +00:00
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st_param = proto_item_add_subtree(ti_param, ett_btsmp_key_dist);
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2012-10-22 12:49:04 +00:00
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proto_tree_add_item(st_param, hf_btsmp_key_dist_enc, tvb, offset, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(st_param, hf_btsmp_key_dist_id, tvb, offset, 1, ENC_LITTLE_ENDIAN);
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proto_tree_add_item(st_param, hf_btsmp_key_dist_sign, tvb, offset, 1, ENC_LITTLE_ENDIAN);
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2013-03-19 13:51:52 +00:00
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if (param & 0x01) {
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2012-10-22 12:49:04 +00:00
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proto_item_append_text(ti_param, "LTK ");
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col_append_fstr(pinfo->cinfo, COL_INFO, "LTK ");
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}
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2013-03-19 13:51:52 +00:00
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if (param & 0x02) {
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2012-10-22 12:49:04 +00:00
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proto_item_append_text(ti_param, "IRK ");
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col_append_fstr(pinfo->cinfo, COL_INFO, "IRK ");
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}
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2013-03-19 13:51:52 +00:00
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if (param & 0x04) {
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2012-10-22 12:49:04 +00:00
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proto_item_append_text(ti_param, "CSRK ");
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col_append_fstr(pinfo->cinfo, COL_INFO, "CSRK ");
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}
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2013-03-19 13:51:52 +00:00
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return offset + 1;
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2012-10-22 12:49:04 +00:00
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}
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2013-07-03 16:43:31 +00:00
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static int
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dissect_btsmp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
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2012-10-22 12:49:04 +00:00
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{
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int offset = 0;
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proto_item *ti;
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proto_tree *st;
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guint8 opcode;
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "SMP");
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2013-03-19 13:51:52 +00:00
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2013-03-30 21:47:27 +00:00
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switch (pinfo->p2p_dir) {
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case P2P_DIR_SENT:
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col_add_str(pinfo->cinfo, COL_INFO, "Sent ");
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break;
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case P2P_DIR_RECV:
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col_add_str(pinfo->cinfo, COL_INFO, "Rcvd ");
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break;
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default:
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col_add_fstr(pinfo->cinfo, COL_INFO, "Unknown direction %d ",
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pinfo->p2p_dir);
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break;
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2012-10-22 12:49:04 +00:00
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}
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if (tvb_length_remaining(tvb, 0) < 1)
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2013-07-03 16:43:31 +00:00
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return FALSE;
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2012-10-22 12:49:04 +00:00
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ti = proto_tree_add_item(tree, proto_btsmp, tvb, 0, -1, ENC_NA);
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st = proto_item_add_subtree(ti, ett_btsmp);
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proto_tree_add_item(st, hf_btsmp_opcode, tvb, 0, 1, ENC_LITTLE_ENDIAN);
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opcode = tvb_get_guint8(tvb, 0);
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offset++;
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2013-03-19 13:51:52 +00:00
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col_append_fstr(pinfo->cinfo, COL_INFO, "%s", val_to_str_const(opcode, opcode_vals, "<unknown>"));
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2012-10-22 12:49:04 +00:00
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switch (opcode) {
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case 0x01: /* Pairing Request */
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case 0x02: /* Pairing Response */
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{
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col_append_fstr(pinfo->cinfo, COL_INFO, ": ");
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2013-03-19 13:51:52 +00:00
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2012-10-22 12:49:04 +00:00
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proto_tree_add_item(st, hf_btsmp_io_capabilities, tvb, offset, 1, ENC_LITTLE_ENDIAN);
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offset++;
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proto_tree_add_item(st, hf_btsmp_oob_data_flags, tvb, offset, 1, ENC_LITTLE_ENDIAN);
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offset++;
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offset = dissect_btsmp_auth_req(tvb, offset, pinfo, st);
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2013-03-19 13:51:52 +00:00
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2012-10-22 12:49:04 +00:00
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proto_tree_add_item(st, hf_btsmp_max_enc_key_size, tvb, offset, 1, ENC_LITTLE_ENDIAN);
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offset++;
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offset = dissect_btsmp_key_dist(tvb, offset, pinfo, st, TRUE);
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offset = dissect_btsmp_key_dist(tvb, offset, pinfo, st, FALSE);
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break;
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}
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case 0x03: /* Pairing Confirm */
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proto_tree_add_item(st, hf_btsmp_cfm_value, tvb, offset, 16, ENC_NA);
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offset += 16;
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break;
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case 0x04: /* Pairing Random */
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proto_tree_add_item(st, hf_btsmp_random, tvb, offset, 16, ENC_NA);
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offset += 16;
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break;
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2013-03-19 13:51:52 +00:00
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2012-10-22 12:49:04 +00:00
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case 0x05: /* Pairing Failed */
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proto_tree_add_item(st, hf_btsmp_reason, tvb, offset, 1, ENC_LITTLE_ENDIAN);
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2013-03-19 13:51:52 +00:00
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col_append_fstr(pinfo->cinfo, COL_INFO, ": %s", val_to_str_const(tvb_get_guint8(tvb, offset), reason_vals, "<unknown>"));
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2012-10-22 12:49:04 +00:00
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offset++;
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break;
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case 0x06: /* Encryption Information */
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proto_tree_add_item(st, hf_btsmp_long_term_key, tvb, offset, 16, ENC_NA);
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offset += 16;
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break;
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case 0x07: /* Master Identification */
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proto_tree_add_item(st, hf_btsmp_ediv, tvb, offset, 2, ENC_LITTLE_ENDIAN);
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offset += 2;
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proto_tree_add_item(st, hf_btsmp_random, tvb, offset, 8, ENC_NA);
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offset += 8;
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break;
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case 0x08: /* Identity Information */
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proto_tree_add_item(st, hf_btsmp_id_resolving_key, tvb, offset, 16, ENC_NA);
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offset += 16;
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break;
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case 0x0a: /* Signing Informationn */
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proto_tree_add_item(st, hf_btsmp_signature_key, tvb, offset, 16, ENC_NA);
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offset += 16;
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break;
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case 0x0b: /* Security Request */
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col_append_fstr(pinfo->cinfo, COL_INFO, ": ");
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offset = dissect_btsmp_auth_req(tvb, offset, pinfo, st);
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break;
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2013-03-19 13:51:52 +00:00
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2012-10-22 12:49:04 +00:00
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default:
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break;
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}
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2013-07-03 16:43:31 +00:00
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return offset;
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2012-10-22 12:49:04 +00:00
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}
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void
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proto_register_btsmp(void)
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2013-03-19 13:51:52 +00:00
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{
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2012-10-22 12:49:04 +00:00
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static hf_register_info hf[] = {
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{&hf_btsmp_opcode,
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{"Opcode", "btsmp.opcode",
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2013-03-19 13:51:52 +00:00
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FT_UINT8, BASE_HEX, VALS(opcode_vals), 0x0,
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2012-10-22 12:49:04 +00:00
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NULL, HFILL}
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},
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{&hf_btsmp_reason,
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{"Reason", "btsmp.reason",
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2013-03-19 13:51:52 +00:00
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FT_UINT8, BASE_HEX, VALS(reason_vals), 0x0,
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2012-10-22 12:49:04 +00:00
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NULL, HFILL}
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},
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{&hf_btsmp_io_capabilities,
|
|
|
|
{"IO Capability", "btsmp.io_capability",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_UINT8, BASE_HEX, VALS(io_capability_vals), 0x0,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_oob_data_flags,
|
|
|
|
{"OOB Data Flags", "btsmp.oob_data_flags",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_UINT8, BASE_HEX, VALS(oob_data_flag_vals), 0x0,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_cfm_value,
|
|
|
|
{"Confirm Value", "btsmp.cfm_value",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_random,
|
|
|
|
{"Random Value", "btsmp.random_value",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_long_term_key,
|
|
|
|
{"Long Term Key", "btsmp.long_term_key",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_id_resolving_key,
|
|
|
|
{"Identity Resolving Key", "btsmp.id_resolving_key",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_signature_key,
|
|
|
|
{"Signature Key", "btsmp.signature_key",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_BYTES, BASE_NONE, NULL, 0x0,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_bonding_flags,
|
|
|
|
{"Bonding Flags", "btsmp.bonding_flags",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_UINT8, BASE_HEX, VALS(bonding_flag_vals), 0x03,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_mitm_flag,
|
|
|
|
{"MITM Flag", "btsmp.mitm_flag",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x04,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_max_enc_key_size,
|
|
|
|
{"Max Encryption Key Size", "btsmp.max_enc_key_size",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x00,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_key_dist_enc,
|
|
|
|
{"Encryption Key (LTK)", "btsmp.key_dist_enc",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x01,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_key_dist_id,
|
|
|
|
{"Id Key (IRK)", "btsmp.key_dist_id",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x02,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_key_dist_sign,
|
|
|
|
{"Signature Key (CSRK)", "btsmp.key_dist_sign",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_UINT8, BASE_DEC, NULL, 0x04,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
},
|
|
|
|
{&hf_btsmp_ediv,
|
|
|
|
{"Encrypted Diversifier (EDIV)", "btsmp.ediv",
|
2013-03-19 13:51:52 +00:00
|
|
|
FT_UINT16, BASE_HEX, NULL, 0x00,
|
2012-10-22 12:49:04 +00:00
|
|
|
NULL, HFILL}
|
|
|
|
}
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Setup protocol subtree array */
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_btsmp,
|
|
|
|
&ett_btsmp_auth_req,
|
|
|
|
&ett_btsmp_key_dist
|
|
|
|
};
|
|
|
|
|
|
|
|
/* Register the protocol name and description */
|
|
|
|
proto_btsmp = proto_register_protocol("Bluetooth Security Manager Protocol",
|
2013-03-18 06:23:22 +00:00
|
|
|
"BT SMP", "btsmp");
|
2012-10-22 12:49:04 +00:00
|
|
|
|
2013-07-03 16:43:31 +00:00
|
|
|
new_register_dissector("btsmp", dissect_btsmp, proto_btsmp);
|
2012-10-22 12:49:04 +00:00
|
|
|
|
|
|
|
/* Required function calls to register the header fields and subtrees used */
|
|
|
|
proto_register_field_array(proto_btsmp, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_btsmp(void)
|
|
|
|
{
|
|
|
|
dissector_handle_t btsmp_handle;
|
|
|
|
|
|
|
|
btsmp_handle = find_dissector("btsmp");
|
|
|
|
dissector_add_uint("btl2cap.cid", BTL2CAP_FIXED_CID_SMP, btsmp_handle);
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Editor modelines - http://www.wireshark.org/tools/modelines.html
|
|
|
|
*
|
|
|
|
* Local variables:
|
|
|
|
* c-basic-offset: 4
|
|
|
|
* tab-width: 8
|
|
|
|
* indent-tabs-mode: nil
|
|
|
|
* End:
|
|
|
|
*
|
|
|
|
* vi: set shiftwidth=4 tabstop=8 expandtab:
|
|
|
|
* :indentSize=4:tabSize=8:noTabs=true:
|
|
|
|
*/
|