/* packet-coap.c * Routines for COAP packet disassembly * draft-ietf-core-coap-07.txt * draft-ietf-core-block-04.txt * draft-ietf-core-observe-02.txt * draft-ietf-core-link-format-06.txt * Shoichi Sakane * * $Id$ * * Wireshark - Network traffic analyzer * By Gerald Combs * Copyright 1998 Gerald Combs * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version 2 * of the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include static dissector_table_t media_type_dissector_table; static int proto_coap = -1; static int hf_coap_version = -1; static int hf_coap_ttype = -1; static int hf_coap_opt_count = -1; static int hf_coap_code = -1; static int hf_coap_tid = -1; static int hf_coap_opt_delta = -1; static int hf_coap_opt_length = -1; static int hf_coap_opt_ctype = -1; static int hf_coap_opt_max_age = -1; static int hf_coap_opt_proxy_uri = -1; static int hf_coap_opt_etag = -1; static int hf_coap_opt_uri_host = -1; static int hf_coap_opt_location_path = -1; static int hf_coap_opt_uri_port = -1; static int hf_coap_opt_location_query = -1; static int hf_coap_opt_uri_path = -1; static int hf_coap_opt_observe = -1; static int hf_coap_opt_token = -1; static int hf_coap_opt_accept = -1; static int hf_coap_opt_if_match = -1; static int hf_coap_opt_block_number = -1; static int hf_coap_opt_block_mflag = -1; static int hf_coap_opt_block_size = -1; static int hf_coap_opt_uri_query = -1; static int hf_coap_opt_if_none_match = -1; static gint ett_coap = -1; static gint ett_coap_option = -1; static gint ett_coap_payload = -1; /* COAP's IANA-assigned port number */ #define DEFAULT_COAP_PORT 5683 static const gchar *coap_content_type = NULL; static gint coap_content_type_value = ~0; static guint global_coap_port_number = DEFAULT_COAP_PORT; static gint block_number = ~0; static guint block_mflag = 0; static gchar uri_string[256]; /* 256 is probably enough to display in the screen */ /* * Transaction Type */ static const value_string vals_ttype[] = { { 0, "Confirmable" }, { 1, "Non-Confirmable" }, { 2, "Acknowledgement" }, { 3, "Reset" }, { 0, NULL }, }; /* * Method Code * Response Code */ static const value_string vals_code[] = { { 0, "Empty Message" }, /* method code */ { 1, "GET" }, { 2, "POST" }, { 3, "PUT" }, { 4, "DELETE" }, /* response code */ { 65, "2.01 Created" }, { 66, "2.02 Deleted" }, { 67, "2.03 Valid" }, { 68, "2.04 Changed" }, { 69, "2.05 Content" }, { 128, "4.00 Bad Request" }, { 129, "4.01 Unauthorized" }, { 130, "4.02 Bad Option" }, { 131, "4.03 Forbidden" }, { 132, "4.04 Not Found" }, { 133, "4.05 Method Not Allowed" }, { 136, "4.08 Request Entity Incomplete" }, /* core-block-03 */ { 140, "4.12 Precondition Failed" }, { 141, "4.13 Request Entity Too Large" }, { 143, "4.15 Unsupported Media Type" }, { 160, "5.00 Internal Server Error" }, { 161, "5.01 Not Implemented" }, { 162, "5.02 Bad Gateway" }, { 163, "5.03 Service Unavailable" }, { 164, "5.04 Gateway Timeout" }, { 165, "5.05 Proxying Not Supported" }, { 0, NULL }, }; /* * Option Headers * No-Option must not be included in this structure, is handled in the function * of the dissector, especially. */ #define COAP_OPT_CONTENT_TYPE 1 #define COAP_OPT_MAX_AGE 2 #define COAP_OPT_PROXY_URI 3 #define COAP_OPT_ETAG 4 #define COAP_OPT_URI_HOST 5 #define COAP_OPT_LOCATION_PATH 6 #define COAP_OPT_URI_PORT 7 #define COAP_OPT_LOCATION_QUERY 8 #define COAP_OPT_URI_PATH 9 #define COAP_OPT_OBSERVE 10 /* core-observe */ #define COAP_OPT_TOKEN 11 #define COAP_OPT_ACCEPT 12 #define COAP_OPT_IF_MATCH 13 #define COAP_OPT_URI_QUERY 15 #define COAP_OPT_BLOCK2 17 /* core-block-03 */ #define COAP_OPT_BLOCK1 19 /* core-block-03 */ #define COAP_OPT_IF_NONE_MATCH 21 static const value_string vals_opt_type[] = { { COAP_OPT_CONTENT_TYPE, "Content-Type" }, { COAP_OPT_MAX_AGE, "Max-age" }, { COAP_OPT_PROXY_URI, "Proxy-Uri" }, { COAP_OPT_ETAG, "Etag" }, { COAP_OPT_URI_HOST, "Uri-Host" }, { COAP_OPT_LOCATION_PATH, "Location-Path" }, { COAP_OPT_URI_PORT, "Uri-Port" }, { COAP_OPT_LOCATION_QUERY, "Location-Query" }, { COAP_OPT_URI_PATH, "Uri-Path" }, { COAP_OPT_OBSERVE, "Observe" }, { COAP_OPT_TOKEN, "Token" }, { COAP_OPT_ACCEPT, "Accept" }, { COAP_OPT_IF_MATCH, "If-Match" }, { COAP_OPT_URI_QUERY, "Uri-Query" }, { COAP_OPT_BLOCK2, "Block2" }, { COAP_OPT_BLOCK1, "Block1" }, { COAP_OPT_IF_NONE_MATCH, "If-None-Match" }, { 0, NULL }, }; static const value_string vals_ctype[] = { { 0, "text/plain" }, { 40, "application/link-format" }, { 41, "application/xml" }, { 42, "application/octet-stream" }, { 47, "application/exi" }, { 50, "application/json" }, { 0, NULL }, }; void proto_reg_handoff_coap(void); static int coap_is_str_ipv6addr(guint8 *str) { size_t len = strlen(str); int colon = 0; while (len--) { if (*str++ == ':') colon++; } return colon > 1 ? 1 : 0; } static void dissect_coap_opt_string(tvbuff_t *tvb, packet_info *pinfo _U_, proto_tree *subtree, gint offset, gint opt_length, int hfindex, int opt_code) { guint8 *hoststr = NULL; proto_tree_add_item(subtree, hfindex, tvb, offset, opt_length, ENC_UTF_8|ENC_NA); /* forming a uri-string */ switch (opt_code) { case COAP_OPT_URI_HOST: g_strlcat(uri_string, "coap://", sizeof(uri_string)); hoststr = tvb_get_ephemeral_string(tvb, offset, opt_length); /* if the string looks an IPv6 address, it has to be enclosed by brackets. */ if (coap_is_str_ipv6addr(hoststr)) { g_strlcat(uri_string, "[", sizeof(uri_string)); g_strlcat(uri_string, hoststr, sizeof(uri_string)); g_strlcat(uri_string, "]", sizeof(uri_string)); } else g_strlcat(uri_string, hoststr, sizeof(uri_string)); break; case COAP_OPT_URI_PATH: g_strlcat(uri_string, "/", sizeof(uri_string)); g_strlcat(uri_string, tvb_get_ephemeral_string(tvb, offset, opt_length), sizeof(uri_string)); break; case COAP_OPT_URI_QUERY: g_strlcat(uri_string, "/?", sizeof(uri_string)); g_strlcat(uri_string, tvb_get_ephemeral_string(tvb, offset, opt_length), sizeof(uri_string)); break; } } static void dissect_coap_opt_ctype(tvbuff_t *tvb, packet_info *pinfo, proto_tree *subtree, gint offset, gint opt_length, int hfindex) { guint32 opt_ctype = 0; if (opt_length != 1) { expert_add_info_format(pinfo, subtree, PI_MALFORMED, PI_WARN, "Invalid Option Length: %d", opt_length); return; } opt_ctype = tvb_get_guint8(tvb, offset); coap_content_type_value = (gint)opt_ctype; coap_content_type = val_to_str(opt_ctype, vals_ctype, "Unknown %d"); proto_tree_add_item(subtree, hfindex, tvb, offset, 1, ENC_BIG_ENDIAN); } static void dissect_coap_opt_time(tvbuff_t *tvb, packet_info *pinfo, proto_tree *subtree, gint offset, gint opt_length, int hfindex) { proto_item *item = NULL; if (opt_length <= 0 || opt_length > 4) { expert_add_info_format(pinfo, subtree, PI_MALFORMED, PI_WARN, "Invalid Option Length: %d", opt_length); return; } item = proto_tree_add_item(subtree, hfindex, tvb, offset, opt_length, ENC_BIG_ENDIAN); proto_item_append_text(item, " (s)"); return; } static void dissect_coap_opt_block(tvbuff_t *tvb, packet_info *pinfo, proto_tree *subtree, gint offset, gint opt_length, int hfindex) { guint8 val = 0; guint encoded_block_size = 0; guint block_size; proto_item *item = NULL; switch (opt_length) { case 1: block_number = (guint)(tvb_get_guint8(tvb, offset) >> 4); break; case 2: block_number = (guint)(tvb_get_ntohs(tvb, offset) >> 4); break; case 3: block_number = (guint)(tvb_get_ntoh24(tvb, offset) >> 4); break; default: expert_add_info_format(pinfo, subtree, PI_MALFORMED, PI_WARN, "Invalid Option Length: %d", opt_length); return; } val = tvb_get_guint8(tvb, offset + opt_length - 1) & 0x0f; encoded_block_size = val & 0x07; block_mflag = val & 0x08; proto_tree_add_int(subtree, hf_coap_opt_block_number, tvb, offset, opt_length, block_number); proto_tree_add_item(subtree, hfindex, tvb, offset + opt_length - 1, 1, ENC_BIG_ENDIAN); block_size = 1 << (encoded_block_size + 4); item = proto_tree_add_item(subtree, hf_coap_opt_block_size, tvb, offset + opt_length - 1, 1, ENC_BIG_ENDIAN); proto_item_append_text(item, ", Result: %d", block_size); } static void dissect_coap_opt_port(tvbuff_t *tvb, packet_info *pinfo, proto_tree *subtree, gint offset, gint opt_length, int hfindex) { proto_item *item = NULL; char portstr[6]; memset(portstr, '\0', sizeof(portstr)); switch (opt_length) { case 0: item = proto_tree_add_uint(subtree, hfindex, tvb, offset, opt_length, pinfo->destport); proto_item_append_text(item, " (default)"); return; case 1: g_snprintf(portstr, sizeof(portstr), "%u", tvb_get_guint8(tvb, offset)); break; case 2: g_snprintf(portstr, sizeof(portstr), "%u", tvb_get_ntohs(tvb, offset)); break; default: expert_add_info_format(pinfo, subtree, PI_MALFORMED, PI_WARN, "Invalid Option Length: %d", opt_length); return; } (void)proto_tree_add_item(subtree, hfindex, tvb, offset, opt_length, ENC_BIG_ENDIAN); /* forming a uri-string */ if (uri_string[0] == '\0') g_strlcat(uri_string, ep_address_to_str(&pinfo->net_dst), sizeof(uri_string)); g_strlcat(uri_string, ":", sizeof(uri_string)); g_strlcat(uri_string, portstr, sizeof(uri_string)); return; } /* * dissector for each option of COAP. * return the total length of the option including the header (e.g. delta and length). */ static int dissect_coap_options(tvbuff_t *tvb, packet_info *pinfo, proto_tree *coap_tree, gint offset, guint8 opt_count, guint8 *opt_code) { guint8 opt_delta; gint opt_length; proto_tree *subtree = NULL; proto_item *item = NULL; gint opt_hlen = 0; tvbuff_t *tvb_lenbuf = NULL; opt_delta = (tvb_get_guint8(tvb, offset) & 0xf0) >> 4; *opt_code += opt_delta; /* * Length: * Normally Length is a 4-bit unsigned integer * allowing values of 0-14 octets. When the length is 15 or more, * another byte is added as an 8-bit unsigned integer plus 15 * allowing values of 15-270 octets. */ opt_length = (tvb_get_guint8(tvb, offset) & 0x0f); opt_hlen = 1; if (opt_length == 0x0f) { opt_length += tvb_get_guint8(tvb, offset + 1); opt_hlen = 2; } item = proto_tree_add_text(coap_tree, tvb, offset, opt_hlen + opt_length, "Option #%u: %s (Type: %u)", opt_count, val_to_str_const(*opt_code, vals_opt_type, *opt_code % 14 == 0 ? "No-Op" : "Unknown Option"), *opt_code); subtree = proto_item_add_subtree(item, ett_coap_option); proto_tree_add_item(subtree, hf_coap_opt_delta, tvb, offset, 1, ENC_BIG_ENDIAN); tvb_lenbuf = tvb_new_subset(tvb, offset, opt_hlen, opt_hlen); proto_tree_add_uint_bits_format_value(subtree, hf_coap_opt_length, tvb_lenbuf, 4, opt_hlen == 1 ? 4 : 12, opt_length, "%d", opt_length); offset += opt_hlen; switch (*opt_code) { case COAP_OPT_CONTENT_TYPE: dissect_coap_opt_ctype(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_ctype); break; case COAP_OPT_MAX_AGE: dissect_coap_opt_time(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_max_age); break; case COAP_OPT_PROXY_URI: dissect_coap_opt_string(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_proxy_uri, COAP_OPT_PROXY_URI); break; case COAP_OPT_ETAG: dissect_coap_opt_string(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_etag, COAP_OPT_ETAG); break; case COAP_OPT_URI_HOST: dissect_coap_opt_string(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_uri_host, COAP_OPT_URI_HOST); break; case COAP_OPT_LOCATION_PATH: dissect_coap_opt_string(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_location_path, COAP_OPT_LOCATION_PATH); break; case COAP_OPT_URI_PORT: dissect_coap_opt_port(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_uri_port); break; case COAP_OPT_LOCATION_QUERY: dissect_coap_opt_string(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_location_query, COAP_OPT_LOCATION_QUERY); break; case COAP_OPT_URI_PATH: dissect_coap_opt_string(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_uri_path, COAP_OPT_URI_PATH); break; case COAP_OPT_OBSERVE: dissect_coap_opt_time(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_observe); break; case COAP_OPT_TOKEN: dissect_coap_opt_string(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_token, COAP_OPT_TOKEN); break; case COAP_OPT_ACCEPT: dissect_coap_opt_ctype(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_accept); break; case COAP_OPT_IF_MATCH: dissect_coap_opt_string(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_if_match, COAP_OPT_IF_MATCH); break; case COAP_OPT_URI_QUERY: dissect_coap_opt_string(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_uri_query, COAP_OPT_URI_QUERY); break; case COAP_OPT_BLOCK2: dissect_coap_opt_block(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_block_mflag); break; case COAP_OPT_BLOCK1: dissect_coap_opt_block(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_block_mflag); break; case COAP_OPT_IF_NONE_MATCH: dissect_coap_opt_string(tvb, pinfo, subtree, offset, opt_length, hf_coap_opt_if_none_match, COAP_OPT_IF_NONE_MATCH); break; default: /* In case of unknown opt_code, just ignore it here. A message is displayed beforehand. */ break; } return offset + opt_length; } static void dissect_coap(tvbuff_t *tvb, packet_info *pinfo, proto_tree *parent_tree) { guint offset = 0; proto_item *coap_root = NULL; proto_tree *coap_tree = NULL; guint8 ttype = 0; guint8 opt_count = 0; guint8 code = 0; guint16 tid = 0; guint coap_length = 0; guint8 opt_code = 0; int i; col_set_str(pinfo->cinfo, COL_PROTOCOL, "COAP"); col_clear(pinfo->cinfo, COL_INFO); /* 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; coap_content_type_value = ~0; coap_root = proto_tree_add_item(parent_tree, proto_coap, tvb, offset, -1, ENC_NA); coap_tree = proto_item_add_subtree(coap_root, ett_coap); proto_tree_add_item(coap_tree, hf_coap_version, tvb, offset, 1, ENC_BIG_ENDIAN); proto_tree_add_item(coap_tree, hf_coap_ttype, tvb, offset, 1, ENC_BIG_ENDIAN); 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, ENC_BIG_ENDIAN); opt_count = tvb_get_guint8(tvb, offset) & 0x0f; offset += 1; proto_tree_add_item(coap_tree, hf_coap_code, tvb, offset, 1, ENC_BIG_ENDIAN); 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, ENC_BIG_ENDIAN); 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); /* initialize the external value */ block_number = ~0; block_mflag = 0; uri_string[0] = 0; /* dissect the options */ for (i = 1; i <= opt_count; i++) { offset = dissect_coap_options(tvb, pinfo, coap_tree, offset, i, &opt_code); if (coap_length < offset) { /* error */ proto_tree_add_text(coap_tree, tvb, 0, 0, "Invalid length: coap_length(%d) < offset(%d)", coap_length, offset); return; } } if (block_number != ~0) { col_append_fstr(pinfo->cinfo, COL_INFO, ", %sBlock #%d", block_mflag ? "" : "End of ", block_number); } if (uri_string[0] != '\0') { col_append_fstr(pinfo->cinfo, COL_INFO, ", %s", uri_string); } /* 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; const char *ctype_str_default = ""; /* * TODO: should the content type be canonicalized ? * currently assuming it be small. */ if (coap_content_type_value == ~0) { /* default: coap-02 section 3.2.1 */ coap_content_type = "text/plain"; ctype_str_default = " (default)"; } payload_item = proto_tree_add_text(coap_tree, tvb, offset, -1, "Payload Content-Type: %s%s, Length: %u, offset: %u", coap_content_type, ctype_str_default, payload_length, offset); payload_tree = proto_item_add_subtree(payload_item, ett_coap_payload); payload_tvb = tvb_new_subset(tvb, offset, payload_length, payload_length); dissector_try_string(media_type_dissector_table, coap_content_type, payload_tvb, pinfo, payload_tree); } } /* * Protocol initialization */ void proto_register_coap(void) { static hf_register_info hf[] = { { &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_delta, { "Delta", "coap.opt.delta", FT_UINT8, BASE_DEC, NULL, 0xf0, "COAP Option Delta", HFILL } }, { &hf_coap_opt_length, { "Length", "coap.opt.length", FT_UINT16, BASE_DEC, NULL, 0x0, "COAP Option Length", HFILL } }, { &hf_coap_opt_ctype, { "Content-type", "coap.opt.ctype", FT_UINT8, BASE_DEC, VALS(vals_ctype), 0x0, "COAP Content Type", HFILL } }, { &hf_coap_opt_max_age, { "Max-age", "coap.opt.max_age", FT_UINT32, BASE_DEC, NULL, 0x0, "COAP Max-age", HFILL } }, { &hf_coap_opt_proxy_uri, { "Proxy-Uri", "coap.opt.proxy_uri", FT_STRING, BASE_NONE, NULL, 0x0, "COAP Proxy-Uri", HFILL } }, { &hf_coap_opt_etag, { "Etag", "coap.opt.etag", FT_BYTES, BASE_NONE, NULL, 0x0, "COAP Etag", HFILL } }, { &hf_coap_opt_uri_host, { "Uri-Host", "coap.opt.uri_host", FT_STRING, BASE_NONE, NULL, 0x0, "COAP Uri-Host", HFILL } }, { &hf_coap_opt_location_path, { "Location-Path", "coap.opt.location_path", FT_STRING, BASE_NONE, NULL, 0x0, "COAP URI Path", HFILL } }, { &hf_coap_opt_uri_port, { "Uri-Port", "coap.opt.uri_port", FT_UINT16, BASE_DEC, NULL, 0x0, "COAP Uri-Port", HFILL } }, { &hf_coap_opt_location_query, { "Location-Query", "coap.opt.location_query", FT_STRING, BASE_NONE, NULL, 0x0, "COAP URI Query", 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_observe, { "Lifetime", "coap.opt.subscr_lifetime", FT_INT32, BASE_DEC, NULL, 0x0, "COAP Observe", HFILL } }, { &hf_coap_opt_token, { "Token", "coap.opt.token", FT_BYTES, BASE_NONE, NULL, 0x0, "COAP Token", HFILL } }, { &hf_coap_opt_accept, { "Accept", "coap.opt.accept", FT_UINT8, BASE_DEC, VALS(vals_ctype), 0x0, "COAP Acceptable Content Type", HFILL } }, { &hf_coap_opt_if_match, { "If-Match", "coap.opt.if_match", FT_BYTES, BASE_NONE, NULL, 0x0, "COAP If-Match", HFILL } }, { &hf_coap_opt_block_number, { "Block Number", "coap.opt.block_number", FT_INT32, BASE_DEC, NULL, 0x0, "COAP Block Number", HFILL } }, { &hf_coap_opt_block_mflag, { "More Flag", "coap.opt.block_mflag", FT_UINT8, BASE_DEC, NULL, 0x08, "COAP Block More Size", HFILL } }, { &hf_coap_opt_block_size, { "Encoded Block Size", "coap.opt.block_size", FT_UINT8, BASE_DEC, NULL, 0x07, "COAP Encoded Block Size", HFILL } }, { &hf_coap_opt_uri_query, { "Uri-Query", "coap.opt.uri_query", FT_STRING, BASE_NONE, NULL, 0x0, "COAP Uri-Query", HFILL } }, { &hf_coap_opt_if_none_match, { "If-None-Match", "coap.opt.if_none_match", FT_BYTES, BASE_NONE, NULL, 0x0, "COAP If-None-Match", HFILL } }, }; static gint *ett[] = { &ett_coap, &ett_coap_option, &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", "COAP port number", "Port number used for COAP traffic", 10, &global_coap_port_number); } void proto_reg_handoff_coap(void) { static gboolean coap_prefs_initialized = FALSE; static dissector_handle_t coap_handle; static guint coap_port_number; 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_uint("udp.port", coap_port_number, coap_handle); dissector_delete_uint("tcp.port", coap_port_number, coap_handle); } coap_port_number = global_coap_port_number; dissector_add_uint("udp.port", coap_port_number, coap_handle); dissector_add_uint("tcp.port", coap_port_number, coap_handle); }