#include "coap_config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "libcoap.h"
#include "coap_debug.h"
#include "pdu.h"
#include "option.h"
#include "encode.h"
#include "mem.h"
#include "coap_session.h"

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Data Structures
struct	error_desc_t

Macros
#define	min(a, b) ((a) < (b) ? (a) : (b))

#define	max(a, b) ((a) > (b) ? (a) : (b))

Functions
void	coap_pdu_clear (coap_pdu_t *pdu, size_t size)
	Clears any contents from `pdu` and resets `used_size`, and `data` pointers. More...

coap_pdu_t *	coap_pdu_init (uint8_t type, uint8_t code, uint16_t tid, size_t size)
	Creates a new CoAP PDU with at least enough storage space for the given `size` maximum message size. More...

coap_pdu_t *	coap_new_pdu (const struct coap_session_t *session)
	Creates a new CoAP PDU. More...

void	coap_delete_pdu (coap_pdu_t *pdu)
	Dispose of an CoAP PDU and frees associated storage. More...

int	coap_pdu_resize (coap_pdu_t *pdu, size_t new_size)
	Dynamically grows the size of `pdu` to `new_size`. More...

static int	coap_pdu_check_resize (coap_pdu_t *pdu, size_t size)

int	coap_add_token (coap_pdu_t pdu, size_t len, const uint8_t data)
	Adds token of length `len` to `pdu`. More...

size_t	coap_add_option (coap_pdu_t pdu, uint16_t type, size_t len, const uint8_t data)
	Adds option of given type to pdu that is passed as first parameter. More...

uint8_t *	coap_add_option_later (coap_pdu_t *pdu, uint16_t type, size_t len)
	Adds option of given type to pdu that is passed as first parameter, but does not write a value. More...

int	coap_add_data (coap_pdu_t pdu, size_t len, const uint8_t data)
	Adds given data to the pdu that is passed as first parameter. More...

uint8_t *	coap_add_data_after (coap_pdu_t *pdu, size_t len)
	Adds given data to the pdu that is passed as first parameter but does not copyt it. More...

int	coap_get_data (const coap_pdu_t pdu, size_t len, uint8_t **data)
	Retrieves the length and data pointer of specified PDU. More...

const char *	coap_response_phrase (unsigned char code)
	Returns a human-readable response phrase for the specified CoAP response `code`. More...

static size_t	next_option_safe (coap_opt_t *optp, size_t length)
	Advances *optp to next option if still in PDU. More...

size_t	coap_pdu_parse_header_size (coap_proto_t proto, const uint8_t *data)
	Interprets `data` to determine the number of bytes in the header. More...

size_t	coap_pdu_parse_size (coap_proto_t proto, const uint8_t *data, size_t length)
	Parses `data` to extract the message size. More...

int	coap_pdu_parse_header (coap_pdu_t *pdu, coap_proto_t proto)
	Decode the protocol specific header for the specified PDU. More...

int	coap_pdu_parse_opt (coap_pdu_t *pdu)
	Verify consistency in the given CoAP PDU structure and locate the data. More...

int	coap_pdu_parse (coap_proto_t proto, const uint8_t data, size_t length, coap_pdu_t pdu)
	Parses `data` into the CoAP PDU structure given in `result`. More...

size_t	coap_pdu_encode_header (coap_pdu_t *pdu, coap_proto_t proto)
	Compose the protocol specific header for the specified PDU. More...

Variables
error_desc_t	coap_error []

Macro Definition Documentation

◆ max

#define max	(	a,
		b
	)	((a) > (b) ? (a) : (b))

Definition at line 42 of file pdu.c.

◆ min

#define min	(	a,
		b
	)	((a) < (b) ? (a) : (b))

Definition at line 38 of file pdu.c.

Function Documentation

◆ coap_add_data()

int coap_add_data	(	coap_pdu_t *	pdu,
		size_t	len,
		const uint8_t *	data
	)

Adds given data to the pdu that is passed as first parameter.

Note that the PDU's data is destroyed by coap_add_option(). coap_add_data() must be called only once per PDU, otherwise the result is undefined.

Definition at line 302 of file pdu.c.

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◆ coap_add_data_after()

uint8_t* coap_add_data_after	(	coap_pdu_t *	pdu,
		size_t	len
	)

Adds given data to the pdu that is passed as first parameter but does not copyt it.

Note that the PDU's data is destroyed by coap_add_option(). coap_add_data() must be have been called once for this PDU, otherwise the result is undefined. The actual data must be copied at the returned location.

Definition at line 314 of file pdu.c.

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◆ coap_add_option()

size_t coap_add_option	(	coap_pdu_t *	pdu,
		uint16_t	type,
		size_t	len,
		const uint8_t *	data
	)

Adds option of given type to pdu that is passed as first parameter.

coap_add_option() destroys the PDU's data, so coap_add_data() must be called after all options have been added. As coap_add_token() destroys the options following the token, the token must be added before coap_add_option() is called. This function returns the number of bytes written or 0 on error.

Definition at line 229 of file pdu.c.

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◆ coap_add_option_later()

uint8_t* coap_add_option_later	(	coap_pdu_t *	pdu,
		uint16_t	type,
		size_t	len
	)

Adds option of given type to pdu that is passed as first parameter, but does not write a value.

It works like coap_add_option with respect to calling sequence (i.e. after token and before data). This function returns a memory address to which the option data has to be written before the PDU can be sent, or NULL on error.

Definition at line 266 of file pdu.c.

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◆ coap_add_token()

int coap_add_token	(	coap_pdu_t *	pdu,
		size_t	len,
		const uint8_t *	data
	)

Adds token of length len to pdu.

Adding the token destroys any following contents of the pdu. Hence options and data must be added after coap_add_token() has been called. In pdu, length is set to len + 4, and max_delta is set to 0. This function returns 0 on error or a value greater than zero on success.

Parameters

pdu	The PDU where the token is to be added.
len	The length of the new token.
data	The token to add.

Returns: A value greater than zero on success, or 0 on error.

Definition at line 205 of file pdu.c.

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◆ coap_delete_pdu()

void coap_delete_pdu ( coap_pdu_t * )

Dispose of an CoAP PDU and frees associated storage.

Not that in general you should not call this function directly. When a PDU is sent with coap_send(), coap_delete_pdu() will be called automatically for you.

Definition at line 141 of file pdu.c.

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◆ coap_get_data()

int coap_get_data	(	const coap_pdu_t *	pdu,
		size_t *	len,
		uint8_t **	data
	)

Retrieves the length and data pointer of specified PDU.

Returns 0 on error or 1 if *len and *data have correct values. Note that these values are destroyed with the pdu.

Definition at line 332 of file pdu.c.

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◆ coap_new_pdu()

coap_pdu_t* coap_new_pdu ( const struct coap_session_t * session )

Creates a new CoAP PDU.

Definition at line 131 of file pdu.c.

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◆ coap_pdu_check_resize()

static int coap_pdu_check_resize	(	coap_pdu_t *	pdu,
		size_t	size
	)

static

Definition at line 188 of file pdu.c.

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◆ coap_pdu_clear()

void coap_pdu_clear	(	coap_pdu_t *	pdu,
		size_t	size
	)

Clears any contents from pdu and resets used_size, and data pointers.

max_size is set to size, any other field is set to 0. Note that pdu must be a valid pointer to a coap_pdu_t object created e.g. by coap_pdu_init().

Definition at line 46 of file pdu.c.

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◆ coap_pdu_encode_header()

size_t coap_pdu_encode_header	(	coap_pdu_t *	pdu,
		coap_proto_t	proto
	)

Compose the protocol specific header for the specified PDU.

Parameters

pdu	A newly composed PDU.
proto	The target wire protocol.

Returns: Number of header bytes prepended before pdu->token or 0 on error.

Definition at line 582 of file pdu.c.

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◆ coap_pdu_init()

coap_pdu_t* coap_pdu_init	(	uint8_t	type,
		uint8_t	code,
		uint16_t	tid,
		size_t	size
	)

Creates a new CoAP PDU with at least enough storage space for the given size maximum message size.

The function returns a pointer to the node coap_pdu_t object on success, or NULL on error. The storage allocated for the result must be released with coap_delete_pdu() if coap_send() is not called.

Parameters

type	The type of the PDU (one of COAP_MESSAGE_CON, COAP_MESSAGE_NON, COAP_MESSAGE_ACK, COAP_MESSAGE_RST).
code	The message code.
tid	The transcation id to set or 0 if unknown / not applicable.
size	The maximum allowed number of byte for the message.

Returns: A pointer to the new PDU object or NULL on error.

Definition at line 91 of file pdu.c.

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◆ coap_pdu_parse()

int coap_pdu_parse	(	coap_proto_t	proto,
		const uint8_t *	data,
		size_t	length,
		coap_pdu_t *	pdu
	)

Parses data into the CoAP PDU structure given in result.

The target pdu must be large enough to This function returns 0 on error or a number greater than zero on success.

Parameters

proto	Session's protocol
data	The raw data to parse as CoAP PDU.
length	The actual size of `data`.
pdu	The PDU structure to fill. Note that the structure must provide space to hold at least the token and options part of the message.

Returns: 1 on success or 0 on error.

Definition at line 557 of file pdu.c.

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◆ coap_pdu_parse_header()

int coap_pdu_parse_header	(	coap_pdu_t *	pdu,
		coap_proto_t	proto
	)

Decode the protocol specific header for the specified PDU.

Parameters

pdu	A newly received PDU.
proto	The target wire protocol.

Returns: 1 for success or 0 on error.

Definition at line 474 of file pdu.c.

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◆ coap_pdu_parse_header_size()

size_t coap_pdu_parse_header_size	(	coap_proto_t	proto,
		const uint8_t *	data
	)

Interprets data to determine the number of bytes in the header.

This function returns 0 on error or a number greater than zero on success.

Parameters

proto	Session's protocol
data	The first byte of raw data to parse as CoAP PDU.

Returns: A value greater than zero on success or 0 on error.

Definition at line 419 of file pdu.c.

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◆ coap_pdu_parse_opt()

int coap_pdu_parse_opt ( coap_pdu_t * pdu )

Verify consistency in the given CoAP PDU structure and locate the data.

This function returns 0 on error or a number greater than zero on success. This function only parses the token and options, up to the payload start marker.

Parameters

pdu	The PDU structure to.

Returns: 1 on success or 0 on error.

Definition at line 506 of file pdu.c.

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◆ coap_pdu_parse_size()

size_t coap_pdu_parse_size	(	coap_proto_t	proto,
		const uint8_t *	data,
		size_t	length
	)

Parses data to extract the message size.

length must be at least coap_pdu_parse_header_size(proto, data). This function returns 0 on error or a number greater than zero on success.

Parameters

proto	Session's protocol
data	The raw data to parse as CoAP PDU.
length	The actual size of `data`.

Returns: A value greater than zero on success or 0 on error.

Definition at line 442 of file pdu.c.

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◆ coap_pdu_resize()

int coap_pdu_resize	(	coap_pdu_t *	pdu,
		size_t	new_size
	)

Dynamically grows the size of pdu to new_size.

The new size must not exceed the PDU's configure maximum size. On success, this function returns 1, otherwise 0.

Parameters

pdu	The PDU to resize.
new_size	The new size in bytes.

Returns: 1 if the operation succeeded, 0 otherwise.

Definition at line 154 of file pdu.c.

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◆ coap_response_phrase()

const char* coap_response_phrase ( unsigned char code )

Returns a human-readable response phrase for the specified CoAP response code.

This function returns NULL if not found.

Parameters

code	The response code for which the literal phrase should be retrieved.

Returns: A zero-terminated string describing the error, or NULL if not found.

Definition at line 384 of file pdu.c.

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◆ next_option_safe()

static size_t next_option_safe	(	coap_opt_t **	optp,
		size_t *	length
	)

static

Advances *optp to next option if still in PDU.

This function returns the number of bytes opt has been advanced or 0 on error.

Definition at line 400 of file pdu.c.

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Variable Documentation

◆ coap_error

error_desc_t coap_error[]

Initial value:

= {
  { COAP_RESPONSE_CODE(201), "Created" },
  { COAP_RESPONSE_CODE(202), "Deleted" },
  { COAP_RESPONSE_CODE(203), "Valid" },
  { COAP_RESPONSE_CODE(204), "Changed" },
  { COAP_RESPONSE_CODE(205), "Content" },
  { COAP_RESPONSE_CODE(231), "Continue" },
  { COAP_RESPONSE_CODE(400), "Bad Request" },
  { COAP_RESPONSE_CODE(401), "Unauthorized" },
  { COAP_RESPONSE_CODE(402), "Bad Option" },
  { COAP_RESPONSE_CODE(403), "Forbidden" },
  { COAP_RESPONSE_CODE(404), "Not Found" },
  { COAP_RESPONSE_CODE(405), "Method Not Allowed" },
  { COAP_RESPONSE_CODE(406), "Not Acceptable" },
  { COAP_RESPONSE_CODE(408), "Request Entity Incomplete" },
  { COAP_RESPONSE_CODE(412), "Precondition Failed" },
  { COAP_RESPONSE_CODE(413), "Request Entity Too Large" },
  { COAP_RESPONSE_CODE(415), "Unsupported Content-Format" },
  { COAP_RESPONSE_CODE(500), "Internal Server Error" },
  { COAP_RESPONSE_CODE(501), "Not Implemented" },
  { COAP_RESPONSE_CODE(502), "Bad Gateway" },
  { COAP_RESPONSE_CODE(503), "Service Unavailable" },
  { COAP_RESPONSE_CODE(504), "Gateway Timeout" },
  { COAP_RESPONSE_CODE(505), "Proxying Not Supported" },
  { 0, NULL }                        
}

Definition at line 356 of file pdu.c.

Data Structures

Macros

Functions

Variables

Macro Definition Documentation

◆ max

◆ min

Function Documentation

◆ coap_add_data()

◆ coap_add_data_after()

◆ coap_add_option()

◆ coap_add_option_later()

◆ coap_add_token()

◆ coap_delete_pdu()

◆ coap_get_data()

◆ coap_new_pdu()

◆ coap_pdu_check_resize()

◆ coap_pdu_clear()

◆ coap_pdu_encode_header()

◆ coap_pdu_init()

◆ coap_pdu_parse()

◆ coap_pdu_parse_header()

◆ coap_pdu_parse_header_size()

◆ coap_pdu_parse_opt()

◆ coap_pdu_parse_size()

◆ coap_pdu_resize()

◆ coap_response_phrase()

◆ next_option_safe()

Variable Documentation

◆ coap_error