2010-10-17 11:48:40 +00:00
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/* packet-coap.c
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* Routines for COAP packet disassembly
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2010-10-20 20:40:53 +00:00
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* draft-ietf-core-coap-02.txt
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* draft-ietf-core-block-00.txt
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* draft-ietf-core-observe-00.txt
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2010-10-21 03:04:15 +00:00
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* Shoichi Sakane <sakane@tanu.org>
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*
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* $Id$
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2010-10-17 11:48:40 +00:00
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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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 <epan/packet.h>
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#include <epan/prefs.h>
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static dissector_table_t media_type_dissector_table;
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static int proto_coap = -1;
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static int hf_coap_version = -1;
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static int hf_coap_ttype = -1;
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static int hf_coap_opt_count = -1;
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static int hf_coap_code = -1;
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static int hf_coap_tid = -1;
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static int hf_coap_opt_ctype = -1;
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static int hf_coap_opt_etag = -1;
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static int hf_coap_opt_uri_authority = -1;
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static int hf_coap_opt_location = -1;
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static int hf_coap_opt_uri_path = -1;
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2010-10-20 20:40:53 +00:00
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static int hf_coap_opt_opaque_bytes = -1;
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2010-10-17 11:48:40 +00:00
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static gint ett_coap = -1;
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static gint ett_coap_noop = -1;
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static gint ett_coap_ctype = -1;
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static gint ett_coap_max_age = -1;
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static gint ett_coap_uri_scheme = -1;
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static gint ett_coap_etag = -1;
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static gint ett_coap_uri_authority = -1;
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static gint ett_coap_location = -1;
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static gint ett_coap_uri_path = -1;
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2010-10-20 20:40:53 +00:00
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static gint ett_coap_subscr_lifetime = -1;
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static gint ett_coap_opaque_bytes = -1;
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static gint ett_coap_block = -1;
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2010-10-17 11:48:40 +00:00
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static gint ett_coap_payload = -1;
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/* TODO: COAP port number will be assigned by IANA after the draft become a RFC */
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#define DEFAULT_COAP_PORT 61616
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static const gchar *coap_content_type = NULL;
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static guint global_coap_port_number = DEFAULT_COAP_PORT;
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/*
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* Transaction Type
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*/
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static const value_string vals_ttype[] = {
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{ 0, "Confirmable" },
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{ 1, "Non-Confirmable" },
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{ 2, "Acknowledgement" },
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{ 3, "Reset" },
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{ 0, NULL },
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};
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/*
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* Method Code
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* Response Code
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*/
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static const value_string vals_code[] = {
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/* method code */
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{ 1, "GET" },
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{ 2, "POST" },
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{ 3, "PUT" },
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{ 4, "DELETE" },
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/* response code */
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{ 40, "100 Continue" },
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{ 80, "200 OK"},
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{ 81, "201 Created"},
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{ 124, "304 Not Modified"},
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{ 160, "400 Bad Request"},
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{ 164, "404 Not Found"},
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{ 165, "405 Method Not Allowed"},
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{ 175, "415 Unsupported Media Type"},
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{ 200, "500 Internal Server Error"},
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{ 202, "502 Bad Gateway"},
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{ 203, "503 Service Unavailable"},
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{ 204, "504 Gateway Timeout"},
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{ 0, NULL },
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};
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/*
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* Option Headers
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* No-Option must not be included in this structure, is handled in the function
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* of the dissector, especially.
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*/
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#define COAP_OPT_CONTENT_TYPE 1
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#define COAP_OPT_MAX_AGE 2
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#define COAP_OPT_ETAG 4
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#define COAP_OPT_URI_AUTHORITY 5
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#define COAP_OPT_LOCATION 6
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#define COAP_OPT_URI_PATH 9
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2010-10-20 20:40:53 +00:00
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#define COAP_OPT_SUBSCR_LIFETIME 10
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#define COAP_OPT_OPAQUE_BYTES 11
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#define COAP_OPT_BLOCK 13
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2010-10-17 11:48:40 +00:00
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static const value_string vals_opt_type[] = {
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{ COAP_OPT_CONTENT_TYPE, "Content-Type" },
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2010-10-20 20:40:53 +00:00
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{ COAP_OPT_MAX_AGE, "Max-age" },
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{ COAP_OPT_ETAG, "Etag" },
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{ COAP_OPT_URI_AUTHORITY, "Uri-Authority" },
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{ COAP_OPT_LOCATION, "Location" },
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{ COAP_OPT_URI_PATH, "Uri-Path" },
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{ COAP_OPT_SUBSCR_LIFETIME, "Subscription Lifetime" },
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{ COAP_OPT_OPAQUE_BYTES, "Opaque Bytes" },
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{ COAP_OPT_BLOCK, "Block" },
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2010-10-17 11:48:40 +00:00
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{ 0, NULL },
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};
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static const value_string vals_ctype[] = {
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2010-10-20 20:40:53 +00:00
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{ 0, "text/plain" },
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{ 1, "text/xml" },
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{ 2, "text/csv" },
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{ 3, "text/html" },
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2010-10-17 11:48:40 +00:00
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{ 21, "image/gif" },
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{ 22, "image/jpeg" },
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{ 23, "image/png" },
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{ 24, "image/tiff" },
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{ 25, "audio/raw" },
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{ 26, "video/raw" },
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{ 40, "application/link-format" },
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{ 41, "application/xml" },
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{ 42, "application/octet-stream" },
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{ 43, "application/rdf+xml" },
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{ 44, "application/soap+xml" },
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{ 45, "application/atom+xml" },
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{ 46, "application/xmpp+xml" },
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{ 47, "application/exi" },
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{ 48, "application/x-bxml" },
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{ 49, "application/fastinfoset" },
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{ 50, "application/soap+fastinfoset" },
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{ 51, "application/json" },
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{ 0, NULL },
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};
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void proto_reg_handoff_coap(void);
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2010-10-20 20:40:53 +00:00
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/* the value of opt_length should be checked out of this function */
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static void
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dissect_coap_opt_time(tvbuff_t *tvb, proto_tree *subtree, int offset, gint opt_length, char *str)
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{
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guint time = 0;
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switch (opt_length) {
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case 0:
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time = 0;
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break;
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case 1:
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time = (guint)tvb_get_guint8(tvb, offset);
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break;
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case 2:
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time = (guint)tvb_get_ntohs(tvb, offset);
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break;
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case 3:
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time = (guint)tvb_get_ntoh24(tvb, offset);
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break;
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case 4:
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time = (guint)tvb_get_ntohl(tvb, offset);
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break;
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default:
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proto_tree_add_text(subtree, tvb, 0, 0, "Invalid length: %d", opt_length);
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break;
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}
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proto_tree_add_text(subtree, tvb, offset, opt_length, "%s: %d (s)", str, time);
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return;
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}
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static void
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dissect_coap_opt_block(tvbuff_t *tvb, proto_tree *subtree, int offset, gint opt_length)
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{
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guint block_number = 0;
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guint more_flag = 0;
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guint block_size = 0;
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guint8 val = 0;
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switch (opt_length) {
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case 1:
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block_number = (guint)(tvb_get_guint8(tvb, offset) >> 4);
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break;
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case 2:
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block_number = (guint)(tvb_get_ntohs(tvb, offset) >> 4);
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break;
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case 3:
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block_number = (guint)(tvb_get_ntoh24(tvb, offset) >> 4);
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break;
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default:
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proto_tree_add_text(subtree, tvb, 0, 0, "Invalid length: %d", opt_length);
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return;
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}
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val = tvb_get_guint8(tvb, offset + opt_length - 1) & 0x0f;
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more_flag = (val & 0x08) >> 3;
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block_size = val & 0x07;
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block_size = 2^(block_size + 4);
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proto_tree_add_text(subtree, tvb, offset, opt_length, "Block Number:%d, More Flag:%d, Block Size:%d", block_number, more_flag, block_size);
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}
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2010-10-17 11:48:40 +00:00
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/*
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* dissector for each option of COAP.
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* return the total length of the option including the header (e.g. delta and length).
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*/
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static int
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2010-10-20 20:40:53 +00:00
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dissect_coap_options(tvbuff_t *tvb, proto_tree *coap_tree, proto_tree *parent_tree _U_, int offset, guint8 opt_count, guint8 *opt_code)
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2010-10-17 11:48:40 +00:00
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{
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guint8 opt_delta;
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guint32 opt_ctype = 0;
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gint opt_length;
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proto_tree *subtree = NULL;
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proto_item *item = NULL;
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int opt_hlen = 0;
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opt_delta = (tvb_get_guint8(tvb, offset) & 0xf0) >> 4;
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*opt_code += opt_delta;
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opt_length = (tvb_get_guint8(tvb, offset) & 0x0f);
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opt_hlen = 1;
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if (opt_length == 0x0f) {
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opt_length += tvb_get_guint8(tvb, offset + 1);
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opt_hlen = 2;
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}
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2010-10-20 20:40:53 +00:00
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item = proto_tree_add_text(coap_tree, tvb, offset, opt_hlen + opt_length,
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"Option #%u (Length: %u) %s", opt_count, opt_length,
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val_to_str(*opt_code, vals_opt_type, "Unknown Option Type %u"));
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2010-10-17 11:48:40 +00:00
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offset += opt_hlen;
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/* if opt_code is a multiple of 14, that means the option is a noop option */
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if (*opt_code % 14 == 0) {
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subtree = proto_item_add_subtree(item, ett_coap_noop);
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proto_tree_add_text(subtree, tvb, 0, 0, "No-Op option");
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} else {
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switch (*opt_code) {
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case COAP_OPT_CONTENT_TYPE:
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subtree = proto_item_add_subtree(item, ett_coap_ctype);
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opt_ctype = tvb_get_guint8(tvb, offset);
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2010-10-20 20:40:53 +00:00
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coap_content_type = val_to_str(opt_ctype, vals_ctype, "Unknown %d");
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2010-10-18 07:13:45 +00:00
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proto_tree_add_item(subtree, hf_coap_opt_ctype, tvb, offset, 1, FALSE);
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2010-10-17 11:48:40 +00:00
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break;
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case COAP_OPT_MAX_AGE:
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subtree = proto_item_add_subtree(item, ett_coap_max_age);
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2010-10-20 20:40:53 +00:00
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dissect_coap_opt_time(tvb, subtree, offset, opt_length, "Max-age");
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break;
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case COAP_OPT_SUBSCR_LIFETIME:
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subtree = proto_item_add_subtree(item, ett_coap_subscr_lifetime);
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dissect_coap_opt_time(tvb, subtree, offset, opt_length, "Subscription Lifetime");
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2010-10-17 11:48:40 +00:00
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break;
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case COAP_OPT_ETAG:
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subtree = proto_item_add_subtree(item, ett_coap_etag);
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proto_tree_add_item(subtree, hf_coap_opt_etag, tvb, offset, opt_length, FALSE);
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break;
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case COAP_OPT_URI_AUTHORITY:
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subtree = proto_item_add_subtree(item, ett_coap_uri_authority);
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proto_tree_add_item(subtree, hf_coap_opt_uri_authority, tvb, offset, opt_length, FALSE);
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break;
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case COAP_OPT_LOCATION:
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subtree = proto_item_add_subtree(item, ett_coap_location);
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proto_tree_add_item(subtree, hf_coap_opt_location, tvb, offset, opt_length, FALSE);
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break;
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case COAP_OPT_URI_PATH:
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subtree = proto_item_add_subtree(item, ett_coap_uri_path);
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proto_tree_add_item(subtree, hf_coap_opt_uri_path, tvb, offset, opt_length, FALSE);
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break;
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2010-10-20 20:40:53 +00:00
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case COAP_OPT_OPAQUE_BYTES:
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/* TODO: implement it after a draft will be published */
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break;
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case COAP_OPT_BLOCK:
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subtree = proto_item_add_subtree(item, ett_coap_block);
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dissect_coap_opt_block(tvb, subtree, offset, opt_length);
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break;
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2010-10-17 11:48:40 +00:00
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default:
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proto_tree_add_text(subtree, tvb, 0, 0, "Unkown Option Type");
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}
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}
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return offset + opt_length;
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}
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static void
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dissect_coap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree)
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{
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guint offset = 0;
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proto_item *coap_root = NULL;
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proto_tree *coap_tree = NULL;
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guint8 ttype = 0;
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guint8 opt_count = 0;
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guint8 code = 0;
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guint16 tid = 0;
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2010-10-20 20:40:53 +00:00
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guint coap_length = 0;
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2010-10-17 11:48:40 +00:00
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guint8 opt_code = 0;
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2010-10-20 20:40:53 +00:00
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int i;
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2010-10-17 11:48:40 +00:00
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "COAP");
|
|
|
|
col_clear(pinfo->cinfo, COL_INFO);
|
|
|
|
|
|
|
|
if (!parent_tree)
|
|
|
|
return;
|
|
|
|
|
2010-10-20 20:40:53 +00:00
|
|
|
/* initialize the COAP length and the content-type */
|
|
|
|
/*
|
|
|
|
* the length of COAP message is not specified in the COAP header.
|
|
|
|
* It has to be from the lower layer. the iplen of packet_info is not accurate.
|
|
|
|
* Currently, the length is just copied from the reported length of the tvbuffer.
|
|
|
|
*/
|
|
|
|
coap_length = tvb_reported_length(tvb);
|
|
|
|
coap_content_type = NULL;
|
|
|
|
|
2010-10-17 11:48:40 +00:00
|
|
|
coap_root = proto_tree_add_item(parent_tree, proto_coap, tvb, offset, -1, FALSE);
|
|
|
|
coap_tree = proto_item_add_subtree(coap_root, ett_coap);
|
|
|
|
|
|
|
|
proto_tree_add_item(coap_tree, hf_coap_version, tvb, offset, 1, FALSE);
|
|
|
|
|
|
|
|
proto_tree_add_item(coap_tree, hf_coap_ttype, tvb, offset, 1, FALSE);
|
|
|
|
ttype = (tvb_get_guint8(tvb, offset) & 0x30) >> 4;
|
|
|
|
col_add_fstr(pinfo->cinfo, COL_INFO, "%s", val_to_str(ttype, vals_ttype, "Unknown %d"));
|
|
|
|
|
|
|
|
proto_tree_add_item(coap_tree, hf_coap_opt_count, tvb, offset, 1, FALSE);
|
|
|
|
opt_count = tvb_get_guint8(tvb, offset) & 0x0f;
|
|
|
|
offset += 1;
|
|
|
|
|
|
|
|
proto_tree_add_item(coap_tree, hf_coap_code, tvb, offset, 1, FALSE);
|
|
|
|
code = tvb_get_guint8(tvb, offset);
|
|
|
|
col_append_fstr(pinfo->cinfo, COL_INFO, ", %s", val_to_str(code, vals_code, "Unknown %d"));
|
|
|
|
offset += 1;
|
|
|
|
|
|
|
|
proto_tree_add_item(coap_tree, hf_coap_tid, tvb, offset, 2, FALSE);
|
|
|
|
tid = tvb_get_ntohs(tvb, offset);
|
|
|
|
offset += 2;
|
|
|
|
|
|
|
|
/* append the header information */
|
|
|
|
proto_item_append_text(coap_tree, ", TID: %u, Length: %u", tid, coap_length);
|
|
|
|
|
|
|
|
/* dissect the options */
|
2010-10-20 20:40:53 +00:00
|
|
|
for (i = 1; i <= opt_count; i++) {
|
|
|
|
offset = dissect_coap_options(tvb, coap_tree, parent_tree, offset, i, &opt_code);
|
2010-10-17 11:48:40 +00:00
|
|
|
if (coap_length < offset) {
|
|
|
|
/* error */
|
2010-10-18 07:13:45 +00:00
|
|
|
proto_tree_add_text(coap_tree, tvb, 0, 0, "Invalid length: coap_length(%d) < offset(%d)", coap_length, offset);
|
2010-10-17 11:48:40 +00:00
|
|
|
return;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/* dissect the payload */
|
|
|
|
if (coap_length > offset) {
|
|
|
|
proto_tree *payload_tree = NULL;
|
|
|
|
proto_item *payload_item = NULL;
|
|
|
|
tvbuff_t *payload_tvb;
|
|
|
|
guint payload_length = coap_length - offset;
|
|
|
|
char *ctype_str_default = "";
|
|
|
|
|
|
|
|
/*
|
|
|
|
* TODO:
|
|
|
|
* currently, coap_content_type is used to distinguish whether
|
|
|
|
* the content-type was specified. If we need to properly handle
|
|
|
|
* the case when the type was unknown, we need another flag.
|
|
|
|
*/
|
|
|
|
if (coap_content_type == NULL) {
|
|
|
|
/* default: coap-02 section 3.2.1 */
|
|
|
|
/* when it's NULL, "text/plain" is set anyway */
|
|
|
|
coap_content_type = "text/plain";
|
2010-10-20 20:40:53 +00:00
|
|
|
ctype_str_default = " (default)";
|
2010-10-17 11:48:40 +00:00
|
|
|
}
|
|
|
|
/*
|
|
|
|
* TODO: should the content type be canonicalized,
|
|
|
|
* currently assuming it be small ?
|
|
|
|
*/
|
|
|
|
|
|
|
|
payload_item = proto_tree_add_text(coap_tree, tvb, offset, -1, "Payload Content-Type: %s%s, Length: %u, offset: %u",
|
2010-10-20 20:40:53 +00:00
|
|
|
coap_content_type, ctype_str_default, payload_length, offset);
|
2010-10-17 11:48:40 +00:00
|
|
|
payload_tree = proto_item_add_subtree(payload_item, ett_coap_payload);
|
|
|
|
payload_tvb = tvb_new_subset(tvb, offset, payload_length, payload_length);
|
|
|
|
|
2010-10-20 20:40:53 +00:00
|
|
|
dissector_try_string(media_type_dissector_table, coap_content_type, payload_tvb, pinfo, payload_tree);
|
2010-10-17 11:48:40 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Protocol initialization
|
|
|
|
*/
|
|
|
|
void
|
|
|
|
proto_register_coap(void)
|
|
|
|
{
|
|
|
|
static hf_register_info hf[] = {
|
2010-10-21 03:04:15 +00:00
|
|
|
{ &hf_coap_version, { "Version", "coap.version", FT_UINT8, BASE_DEC, NULL, 0xc0, "COAP Version", HFILL }},
|
|
|
|
{ &hf_coap_ttype, { "Type", "coap.type", FT_UINT8, BASE_DEC, VALS(&vals_ttype), 0x30, "COAP Transaction Type", HFILL }},
|
|
|
|
{ &hf_coap_opt_count, { "Option Count", "coap.optcount", FT_UINT8, BASE_DEC, NULL, 0x0f, "COAP Option Count", HFILL }},
|
|
|
|
{ &hf_coap_code, { "Code", "coap.code", FT_UINT8, BASE_DEC, VALS(&vals_code), 0x0, "COAP Method or Response Code", HFILL }},
|
|
|
|
{ &hf_coap_tid, { "Transaction ID", "coap.tid", FT_UINT16, BASE_DEC, NULL, 0x0, "COAP Transaction ID", HFILL }},
|
|
|
|
{ &hf_coap_opt_ctype, { "Content-type", "coap.opt.ctype", FT_UINT8, BASE_DEC, VALS(&vals_ctype), 0x0, "COAP Media Type", HFILL }},
|
|
|
|
{ &hf_coap_opt_etag, { "Etag", "coap.opt.etag", FT_BYTES, BASE_NONE, NULL, 0x0, "COAP Etag", HFILL }},
|
|
|
|
{ &hf_coap_opt_uri_authority, { "Uri-Authority", "coap.opt.uri_auth", FT_STRING, BASE_NONE, NULL, 0x0, "COAP Uri-Authority", HFILL }},
|
|
|
|
{ &hf_coap_opt_location, { "Location", "coap.opt.location", FT_STRING, BASE_NONE, NULL, 0x0, "COAP Location", HFILL }},
|
|
|
|
{ &hf_coap_opt_uri_path, { "Uri-Path", "coap.opt.uri_path", FT_STRING, BASE_NONE, NULL, 0x0, "COAP Uri-Path", HFILL }},
|
|
|
|
{ &hf_coap_opt_opaque_bytes, { "Opaque Bytes", "coap.opt.opaquebytes", FT_BYTES, BASE_NONE, NULL, 0x0, "COAP Opaque Bytes", HFILL }},
|
2010-10-17 11:48:40 +00:00
|
|
|
};
|
|
|
|
|
|
|
|
static gint *ett[] = {
|
|
|
|
&ett_coap,
|
2010-10-19 06:58:08 +00:00
|
|
|
&ett_coap_noop,
|
2010-10-17 11:48:40 +00:00
|
|
|
&ett_coap_ctype,
|
|
|
|
&ett_coap_max_age,
|
|
|
|
&ett_coap_uri_scheme,
|
|
|
|
&ett_coap_etag,
|
|
|
|
&ett_coap_uri_authority,
|
|
|
|
&ett_coap_location,
|
|
|
|
&ett_coap_uri_path,
|
2010-10-20 20:40:53 +00:00
|
|
|
&ett_coap_subscr_lifetime,
|
|
|
|
&ett_coap_opaque_bytes,
|
|
|
|
&ett_coap_block,
|
2010-10-17 11:48:40 +00:00
|
|
|
&ett_coap_payload,
|
|
|
|
};
|
|
|
|
|
|
|
|
module_t *coap_module;
|
|
|
|
|
|
|
|
proto_coap = proto_register_protocol("Constrained Application Protocol", "COAP", "coap");
|
|
|
|
proto_register_field_array(proto_coap, hf, array_length(hf));
|
|
|
|
proto_register_subtree_array(ett, array_length(ett));
|
|
|
|
|
|
|
|
register_dissector("coap", dissect_coap, proto_coap);
|
|
|
|
|
|
|
|
/* Register our configuration options */
|
|
|
|
coap_module = prefs_register_protocol (proto_coap, proto_reg_handoff_coap);
|
|
|
|
|
|
|
|
prefs_register_uint_preference (coap_module, "udp_port",
|
2010-10-21 03:04:15 +00:00
|
|
|
"COAP port number",
|
|
|
|
"Port number used for COAP traffic",
|
|
|
|
10, &global_coap_port_number);
|
2010-10-17 11:48:40 +00:00
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
proto_reg_handoff_coap(void)
|
|
|
|
{
|
2010-10-19 13:30:40 +00:00
|
|
|
static gboolean coap_prefs_initialized = FALSE;
|
2010-10-17 12:20:25 +00:00
|
|
|
static dissector_handle_t coap_handle;
|
2010-10-21 03:04:15 +00:00
|
|
|
static guint coap_port_number;
|
2010-10-17 11:48:40 +00:00
|
|
|
|
|
|
|
if (!coap_prefs_initialized) {
|
|
|
|
coap_handle = find_dissector("coap");
|
|
|
|
media_type_dissector_table = find_dissector_table("media_type");
|
|
|
|
coap_prefs_initialized = TRUE;
|
|
|
|
} else {
|
|
|
|
dissector_delete("udp.port", coap_port_number, coap_handle);
|
|
|
|
dissector_delete("tcp.port", coap_port_number, coap_handle);
|
|
|
|
}
|
|
|
|
|
|
|
|
coap_port_number = global_coap_port_number;
|
|
|
|
dissector_add("udp.port", coap_port_number, coap_handle);
|
|
|
|
dissector_add("tcp.port", coap_port_number, coap_handle);
|
|
|
|
}
|