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/* packet-coap.h
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#ifndef __PACKET_COAP_H__
#define __PACKET_COAP_H__
#include "packet-oscore.h"
/* bitmasks */
#define COAP_VERSION_MASK 0xC0
#define COAP_TYPE_MASK 0x30
#define COAP_TOKEN_LEN_MASK 0x0F
#define COAP_BLOCK_MFLAG_MASK 0x08
#define COAP_BLOCK_SIZE_MASK 0x07
#define COAP_OBJECT_SECURITY_RESERVED_MASK 0xE0
#define COAP_OBJECT_SECURITY_KID_CONTEXT_MASK 0x10
#define COAP_OBJECT_SECURITY_KID_MASK 0x08
#define COAP_OBJECT_SECURITY_PIVLEN_MASK 0x07
/* Parent protocol for CoAP */
typedef enum {
PARENT_WEBSOCKETS, /* WebSockets */
PARENT_TCP_TLS, /* TCP or TLS */
PARENT_OTHER /* UDP, WAP, other packet-based protocols */
} coap_parent_protocol;
/* CoAP Message information */
typedef struct {
const char *ctype_str;
unsigned ctype_value;
unsigned block_option; /* Indicates Block1 or Block2 option */
unsigned block_number;
unsigned block_mflag;
wmem_strbuf_t *uri_str_strbuf; /* the maximum is 1024 > 510 = Uri-Host:255 + Uri-Path:255 x 2 */
wmem_strbuf_t *uri_query_strbuf; /* the maximum is 1024 > 765 = Uri-Query:255 x 3 */
bool is_coap_for_tmf; /* CoAP for Thread Management Framework */
bool object_security;
oscore_info_t *oscore_info; /* OSCORE data needed to decrypt */
} coap_info;
/* CoAP Conversation information */
typedef struct {
wmem_map_t *messages;
} coap_conv_info;
/* CoAP Transaction tracking information */
typedef struct {
wmem_map_t *req_rsp;
wmem_strbuf_t *uri_str_strbuf;
oscore_info_t *oscore_info; /* OSCORE transaction to decrypt response */
} coap_transaction;
typedef struct {
uint32_t req_frame;
uint32_t rsp_frame;
nstime_t req_time;
} coap_request_response;
/* common header fields, subtrees and expert info for SSL and DTLS dissectors */
typedef struct coap_common_dissect {
struct {
/* Header fields */
int code;
/* Payload fields */
int payload;
int payload_desc;
int payload_length;
/* Option fields */
int opt_name;
int opt_desc;
int opt_delta;
int opt_delta_ext;
int opt_length;
int opt_length_ext;
int opt_end_marker;
int opt_ctype;
int opt_max_age;
int opt_proxy_uri;
int opt_proxy_scheme;
int opt_size1;
int opt_etag;
int opt_uri_host;
int opt_location_path;
int opt_uri_port;
int opt_location_query;
int opt_uri_path;
int opt_uri_path_recon;
int opt_observe_req;
int opt_observe_rsp;
int opt_hop_limit;
int opt_accept;
int opt_if_match;
int opt_block_number;
int opt_block_mflag;
int opt_block_size;
int opt_uri_query;
int opt_echo;
int opt_no_response;
int opt_request_tag;
int opt_ocf_version;
int opt_ocf_accept_version;
int opt_unknown;
int opt_object_security_reserved;
int opt_object_security_kid_context_present;
int opt_object_security_kid_present;
int opt_object_security_piv_len;
int opt_object_security_piv;
int opt_object_security_kid_context_len;
int opt_object_security_kid_context;
int opt_object_security_kid;
/* do not forget to update COAP_COMMON_HF_LIST! */
} hf;
struct {
int payload;
int option;
/* do not forget to update COAP_COMMON_ETT_LIST! */
} ett;
struct {
/* Generic expert info for malformed packets. */
expert_field opt_unknown_number;
expert_field opt_invalid_number;
expert_field opt_invalid_range;
expert_field opt_length_bad;
expert_field opt_object_security_bad;
/* do not forget to update COAP_COMMON_EI_LIST! */
} ei;
} coap_common_dissect_t;
uint8_t dissect_coap_code(tvbuff_t *tvb, proto_tree *coap_tree, int *offset, coap_common_dissect_t *dissect_hf, uint8_t *code_class);
int dissect_coap_options(tvbuff_t *tvb, packet_info *pinfo, proto_tree *coap_tree, int offset, int offset_end, uint8_t code_class, coap_info *coinfo, coap_common_dissect_t *dissect_hf);
void dissect_coap_payload(tvbuff_t *tvb, packet_info *pinfo, proto_tree *coap_tree, proto_tree *parent_tree, int offset, int offset_end, uint8_t code_class, coap_info *coinfo, coap_common_dissect_t *dissect_hf, bool oscore);
extern const value_string coap_vals_observe_options[];
extern value_string_ext coap_vals_code_ext;
/* {{{ */
#define COAP_COMMON_LIST_T(name) \
coap_common_dissect_t name;
/* }}} */
/* {{{ */
#define COAP_COMMON_HF_LIST(name, prefix) \
{ & name .hf.code, \
{ "Code", prefix ".code", \
FT_UINT8, BASE_DEC | BASE_EXT_STRING, &coap_vals_code_ext, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.payload, \
{ "Payload", prefix ".payload", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.payload_desc, \
{ "Payload Desc", prefix ".payload_desc", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.payload_length, \
{ "Payload Length", prefix ".payload_length", \
FT_UINT32, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_name, \
{ "Opt Name", prefix ".opt.name", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_desc, \
{ "Opt Desc", prefix ".opt.desc", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_delta, \
{ "Opt Delta", prefix ".opt.delta", \
FT_UINT8, BASE_DEC, NULL, 0xf0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_delta_ext, \
{ "Opt Delta extended", prefix ".opt.delta_ext", \
FT_UINT16, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_length, \
{ "Opt Length", prefix ".opt.length", \
FT_UINT8, BASE_DEC, NULL, 0x0f, \
"Option Length", HFILL } \
}, \
{ & name .hf.opt_length_ext, \
{ "Opt Length extended", prefix ".opt.length_ext", \
FT_UINT16, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_end_marker, \
{ "End of options marker", prefix ".opt.end_marker", \
FT_UINT8, BASE_DEC, NULL, 0x00, \
NULL, HFILL } \
}, \
{ & name .hf.opt_ctype, \
{ "Content-type", prefix ".opt.ctype", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_max_age, \
{ "Max-age", prefix ".opt.max_age", \
FT_UINT32, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_proxy_uri, \
{ "Proxy-Uri", prefix ".opt.proxy_uri", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_proxy_scheme, \
{ "Proxy-Scheme", prefix ".opt.proxy_scheme", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_size1, \
{ "Size1", prefix ".opt.size1", \
FT_UINT32, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_etag, \
{ "Etag", prefix ".opt.etag", \
FT_BYTES, BASE_NONE, NULL, 0x0, \
"Option Etag", HFILL } \
}, \
{ & name .hf.opt_uri_host, \
{ "Uri-Host", prefix ".opt.uri_host", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_location_path, \
{ "Location-Path", prefix ".opt.location_path", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_uri_port, \
{ "Uri-Port", prefix ".opt.uri_port", \
FT_UINT16, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_location_query, \
{ "Location-Query", prefix ".opt.location_query", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_object_security_reserved, \
{ "Reserved", prefix ".opt.object_security_reserved", \
FT_BOOLEAN, 8, NULL, COAP_OBJECT_SECURITY_RESERVED_MASK, \
NULL, HFILL } \
}, \
{ & name .hf.opt_object_security_kid_context_present, \
{ "Key ID Context Present", prefix ".opt.object_security_kid_context_present",\
FT_BOOLEAN, 8, NULL, COAP_OBJECT_SECURITY_KID_CONTEXT_MASK, \
NULL, HFILL } \
}, \
{ & name .hf.opt_object_security_kid_present, \
{ "Key ID Present", prefix ".opt.object_security_kid_present", \
FT_BOOLEAN, 8, NULL, COAP_OBJECT_SECURITY_KID_MASK, \
NULL, HFILL } \
}, \
{ & name .hf.opt_object_security_piv_len, \
{ "Partial IV Length", prefix ".opt.object_security_piv_len", \
FT_UINT8, BASE_DEC, NULL, COAP_OBJECT_SECURITY_PIVLEN_MASK, \
NULL, HFILL } \
}, \
{ & name .hf.opt_object_security_piv, \
{ "Partial IV", prefix ".opt.object_security_piv", \
FT_BYTES, BASE_NONE, NULL, 0x00, \
NULL, HFILL } \
}, \
{ & name .hf.opt_object_security_kid_context_len, \
{ "Key ID Context Length", prefix ".opt.object_security_kid_context_len",\
FT_UINT8, BASE_DEC, NULL, 0x00, \
NULL, HFILL } \
}, \
{ & name .hf.opt_object_security_kid_context, \
{ "Key ID Context", prefix ".opt.object_security_kid_context", \
FT_BYTES, BASE_NONE, NULL, 0x00, \
NULL, HFILL } \
}, \
{ & name .hf.opt_object_security_kid, \
{ "Key ID", prefix ".opt.object_security_kid", \
FT_BYTES, BASE_NONE, NULL, 0x00, \
NULL, HFILL } \
}, \
{ & name .hf.opt_uri_path, \
{ "Uri-Path", prefix ".opt.uri_path", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_uri_path_recon, \
{ "Uri-Path", prefix ".opt.uri_path_recon", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_observe_req, \
{ "Observe", prefix ".opt.observe", \
FT_UINT32, BASE_DEC, VALS(coap_vals_observe_options), 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_observe_rsp, \
{ "Observe sequence number", prefix ".opt.observe", \
FT_UINT32, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_hop_limit, \
{ "Hop Limit", prefix ".opt.hop_limit", \
FT_UINT8, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_accept, \
{ "Accept", prefix ".opt.accept", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_if_match, \
{ "If-Match", prefix ".opt.if_match", \
FT_BYTES, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_block_number, \
{ "Block Number", prefix ".opt.block_number", \
FT_UINT32, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_block_mflag, \
{ "More Flag", prefix ".opt.block_mflag", \
FT_UINT8, BASE_DEC, NULL, COAP_BLOCK_MFLAG_MASK, \
NULL, HFILL } \
}, \
{ & name .hf.opt_block_size, \
{ "Encoded Block Size", prefix ".opt.block_size", \
FT_UINT8, BASE_DEC, NULL, COAP_BLOCK_SIZE_MASK, \
NULL, HFILL } \
}, \
{ & name .hf.opt_uri_query, \
{ "Uri-Query", prefix ".opt.uri_query", \
FT_STRING, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_echo, \
{ "Echo", prefix ".opt.opt_echo", \
FT_BYTES, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_no_response, \
{ "No-Response", prefix ".opt.opt_no_response", \
FT_UINT8, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_request_tag, \
{ "Request-Tag", prefix ".opt.opt_request_tag", \
FT_BYTES, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_ocf_version, \
{ "OCF-Content-Format-Version", \
prefix ".opt.opt_ocf_version", \
FT_UINT8, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_ocf_accept_version, \
{ "OCF-Accept-Content-Format-Version", \
prefix ".opt.opt_ocf_accept_version", \
FT_UINT8, BASE_DEC, NULL, 0x0, \
NULL, HFILL } \
}, \
{ & name .hf.opt_unknown, \
{ "Unknown", prefix ".opt.unknown", \
FT_BYTES, BASE_NONE, NULL, 0x0, \
NULL, HFILL } \
}, \
/* }}} */
/* {{{ */
#define COAP_COMMON_ETT_LIST(name) \
& name .ett.payload, \
& name .ett.option, \
/* }}} */
/* {{{ */
#define COAP_COMMON_EI_LIST(name, prefix) \
{ & name .ei.opt_unknown_number, \
{ prefix ".unknown_option_number", PI_UNDECODED, PI_WARN, \
"Unknown Option Number", EXPFILL } \
}, \
{ & name .ei.opt_invalid_number, \
{ prefix ".invalid_option_number", PI_MALFORMED, PI_WARN, \
"Invalid Option Number", EXPFILL } \
}, \
{ & name .ei.opt_invalid_range, \
{ prefix ".invalid_option_range", PI_MALFORMED, PI_WARN, \
"Invalid Option Range", EXPFILL } \
}, \
{ & name .ei.opt_length_bad, \
{ prefix ".option_length_bad", PI_MALFORMED, PI_WARN, \
"Option length bad", EXPFILL } \
}, \
{ & name .ei.opt_object_security_bad, \
{ prefix ".option_oscore_bad", PI_MALFORMED, PI_WARN, \
"Invalid OSCORE Option Format", EXPFILL } \
}, \
/* }}} */
#endif /* __PACKET_COAP_H__ */
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 8
* tab-width: 8
* indent-tabs-mode: t
* End:
*
* vi: set shiftwidth=8 tabstop=8 noexpandtab:
* :indentSize=8:tabSize=8:noTabs=false:
*/
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