libcoap  4.3.0beta
net.c File Reference
#include "coap_internal.h"
#include <ctype.h>
#include <stdio.h>
#include <errno.h>
+ Include dependency graph for net.c:

Go to the source code of this file.

Macros

#define INET6_ADDRSTRLEN   40
 
#define min(a, b)   ((a) < (b) ? (a) : (b))
 
#define FRAC_BITS   6
 The number of bits for the fractional part of ACK_TIMEOUT and ACK_RANDOM_FACTOR. More...
 
#define MAX_BITS   8
 The maximum number of bits for fixed point integers that are used for retransmission time calculation. More...
 
#define Q(frac, fval)
 creates a Qx.frac from fval in coap_fixed_point_t More...
 
#define ACK_RANDOM_FACTOR    Q(FRAC_BITS, session->ack_random_factor)
 creates a Qx.FRAC_BITS from session's 'ack_random_factor' More...
 
#define ACK_TIMEOUT   Q(FRAC_BITS, session->ack_timeout)
 creates a Qx.FRAC_BITS from session's 'ack_timeout' More...
 
#define FP1   Q(FRAC_BITS, ((coap_fixed_point_t){1,0}))
 
#define SHR_FP(val, frac)   (((val) + (1 << ((frac) - 1))) >> (frac))
 
#define SZX_TO_BYTES(SZX)   ((size_t)(1 << ((SZX) + 4)))
 

Enumerations

enum  respond_t { RESPONSE_DEFAULT , RESPONSE_DROP , RESPONSE_SEND }
 Internal flags to control the treatment of responses (specifically in presence of the No-Response option). More...
 

Functions

COAP_STATIC_INLINE coap_queue_tcoap_malloc_node (void)
 
COAP_STATIC_INLINE void coap_free_node (coap_queue_t *node)
 
unsigned int coap_adjust_basetime (coap_context_t *ctx, coap_tick_t now)
 Set sendqueue_basetime in the given context object ctx to now. More...
 
int coap_insert_node (coap_queue_t **queue, coap_queue_t *node)
 Adds node to given queue, ordered by variable t in node. More...
 
int coap_delete_node (coap_queue_t *node)
 Destroys specified node. More...
 
void coap_delete_all (coap_queue_t *queue)
 Removes all items from given queue and frees the allocated storage. More...
 
coap_queue_tcoap_new_node (void)
 Creates a new node suitable for adding to the CoAP sendqueue. More...
 
coap_queue_tcoap_peek_next (coap_context_t *context)
 Returns the next pdu to send without removing from sendqeue. More...
 
coap_queue_tcoap_pop_next (coap_context_t *context)
 Returns the next pdu to send and removes it from the sendqeue. More...
 
static size_t coap_get_session_client_psk (const coap_session_t *session, const uint8_t *hint, size_t hint_len, uint8_t *identity, size_t *identity_len, size_t max_identity_len, uint8_t *psk, size_t max_psk_len)
 
static size_t coap_get_context_server_psk (const coap_session_t *session, const uint8_t *identity, size_t identity_len, uint8_t *psk, size_t max_psk_len)
 
static size_t coap_get_context_server_hint (const coap_session_t *session, uint8_t *hint, size_t max_hint_len)
 
int coap_context_set_psk (coap_context_t *ctx, const char *hint, const uint8_t *key, size_t key_len)
 Set the context's default PSK hint and/or key for a server. More...
 
int coap_context_set_psk2 (coap_context_t *ctx, coap_dtls_spsk_t *setup_data)
 Set the context's default PSK hint and/or key for a server. More...
 
int coap_context_set_pki (coap_context_t *ctx, const coap_dtls_pki_t *setup_data)
 Set the context's default PKI information for a server. More...
 
int coap_context_set_pki_root_cas (coap_context_t *ctx, const char *ca_file, const char *ca_dir)
 Set the context's default Root CA information for a client or server. More...
 
void coap_context_set_keepalive (coap_context_t *context, unsigned int seconds)
 Set the context keepalive timer for sessions. More...
 
int coap_context_get_coap_fd (coap_context_t *context)
 Get the libcoap internal file descriptor for using in an application's select() or returned as an event in an application's epoll_wait() call. More...
 
coap_context_tcoap_new_context (const coap_address_t *listen_addr)
 Creates a new coap_context_t object that will hold the CoAP stack status. More...
 
void coap_set_app_data (coap_context_t *ctx, void *app_data)
 Stores data with the given CoAP context. More...
 
void * coap_get_app_data (const coap_context_t *ctx)
 Returns any application-specific data that has been stored with context using the function coap_set_app_data(). More...
 
void coap_free_context (coap_context_t *context)
 CoAP stack context must be released with coap_free_context(). More...
 
int coap_option_check_critical (coap_context_t *ctx, coap_pdu_t *pdu, coap_opt_filter_t unknown)
 Verifies that pdu contains no unknown critical options. More...
 
coap_tid_t coap_send_ack (coap_session_t *session, coap_pdu_t *request)
 Sends an ACK message with code 0 for the specified request to dst. More...
 
ssize_t coap_session_send_pdu (coap_session_t *session, coap_pdu_t *pdu)
 Send a pdu according to the session's protocol. More...
 
static ssize_t coap_send_pdu (coap_session_t *session, coap_pdu_t *pdu, coap_queue_t *node)
 
coap_tid_t coap_send_error (coap_session_t *session, coap_pdu_t *request, unsigned char code, coap_opt_filter_t opts)
 Sends an error response with code code for request request to dst. More...
 
coap_tid_t coap_send_message_type (coap_session_t *session, coap_pdu_t *request, unsigned char type)
 Helper funktion to create and send a message with type (usually ACK or RST). More...
 
unsigned int coap_calc_timeout (coap_session_t *session, unsigned char r)
 Calculates the initial timeout based on the session CoAP transmission parameters 'ack_timeout', 'ack_random_factor', and COAP_TICKS_PER_SECOND. More...
 
coap_tid_t coap_wait_ack (coap_context_t *context, coap_session_t *session, coap_queue_t *node)
 
coap_tid_t coap_send (coap_session_t *session, coap_pdu_t *pdu)
 Sends a CoAP message to given peer. More...
 
coap_tid_t coap_retransmit (coap_context_t *context, coap_queue_t *node)
 Handles retransmissions of confirmable messages. More...
 
static int coap_handle_dgram_for_proto (coap_context_t *ctx, coap_session_t *session, coap_packet_t *packet)
 
static void coap_connect_session (coap_context_t *ctx, coap_session_t *session, coap_tick_t now)
 
static void coap_write_session (coap_context_t *ctx, coap_session_t *session, coap_tick_t now)
 
static void coap_read_session (coap_context_t *ctx, coap_session_t *session, coap_tick_t now)
 
static int coap_read_endpoint (coap_context_t *ctx, coap_endpoint_t *endpoint, coap_tick_t now)
 
static int coap_write_endpoint (coap_context_t *ctx, coap_endpoint_t *endpoint, coap_tick_t now)
 
static int coap_accept_endpoint (coap_context_t *ctx, coap_endpoint_t *endpoint, coap_tick_t now)
 
void coap_io_do_io (coap_context_t *ctx, coap_tick_t now)
 Processes any outstanding read, write, accept or connect I/O as indicated in the coap_socket_t structures (COAP_SOCKET_CAN_xxx set) embedded in endpoints or sessions associated with ctx. More...
 
void coap_io_do_epoll (coap_context_t *ctx, struct epoll_event *events, size_t nevents)
 Process all the epoll events. More...
 
int coap_handle_dgram (coap_context_t *ctx, coap_session_t *session, uint8_t *msg, size_t msg_len)
 Parses and interprets a CoAP datagram with context ctx. More...
 
int coap_remove_from_queue (coap_queue_t **queue, coap_session_t *session, coap_tid_t id, coap_queue_t **node)
 This function removes the element with given id from the list given list. More...
 
COAP_STATIC_INLINE int token_match (const uint8_t *a, size_t alen, const uint8_t *b, size_t blen)
 
void coap_cancel_session_messages (coap_context_t *context, coap_session_t *session, coap_nack_reason_t reason)
 Cancels all outstanding messages for session session. More...
 
void coap_cancel_all_messages (coap_context_t *context, coap_session_t *session, const uint8_t *token, size_t token_length)
 Cancels all outstanding messages for session session that have the specified token. More...
 
coap_queue_tcoap_find_transaction (coap_queue_t *queue, coap_session_t *session, coap_tid_t id)
 Retrieves transaction from the queue. More...
 
coap_pdu_tcoap_new_error_response (coap_pdu_t *request, unsigned char code, coap_opt_filter_t opts)
 Creates a new ACK PDU with specified error code. More...
 
COAP_STATIC_INLINE size_t get_wkc_len (coap_context_t *context, coap_opt_t *query_filter)
 Quick hack to determine the size of the resource description for .well-known/core. More...
 
coap_pdu_tcoap_wellknown_response (coap_context_t *context, coap_session_t *session, coap_pdu_t *request)
 Creates a new response for given request with the contents of .well-known/core. More...
 
static int coap_cancel (coap_context_t *context, const coap_queue_t *sent)
 This function cancels outstanding messages for the session and token specified in sent. More...
 
static enum respond_t no_response (coap_pdu_t *request, coap_pdu_t *response)
 Checks for No-Response option in given request and returns 1 if response should be suppressed according to RFC 7967. More...
 
static void handle_request (coap_context_t *context, coap_session_t *session, coap_pdu_t *pdu)
 
static void handle_response (coap_context_t *context, coap_session_t *session, coap_pdu_t *sent, coap_pdu_t *rcvd)
 
static void handle_signaling (coap_context_t *context, coap_session_t *session, coap_pdu_t *pdu)
 
void coap_dispatch (coap_context_t *context, coap_session_t *session, coap_pdu_t *pdu)
 Dispatches the PDUs from the receive queue in given context. More...
 
int coap_handle_event (coap_context_t *context, coap_event_t event, coap_session_t *session)
 Invokes the event handler of context for the given event and data. More...
 
int coap_can_exit (coap_context_t *context)
 Returns 1 if there are no messages to send or to dispatch in the context's queues. More...
 
void coap_startup (void)
 
void coap_cleanup (void)
 
int coap_join_mcast_group (coap_context_t *ctx, const char *group_name)
 Function interface for joining a multicast group for listening. More...
 

Variables

static coap_str_const_t coap_default_uri_wellknown
 
static int coap_started = 0
 

Macro Definition Documentation

◆ ACK_RANDOM_FACTOR

#define ACK_RANDOM_FACTOR    Q(FRAC_BITS, session->ack_random_factor)

creates a Qx.FRAC_BITS from session's 'ack_random_factor'

Definition at line 83 of file net.c.

◆ ACK_TIMEOUT

#define ACK_TIMEOUT   Q(FRAC_BITS, session->ack_timeout)

creates a Qx.FRAC_BITS from session's 'ack_timeout'

Definition at line 87 of file net.c.

◆ FP1

#define FP1   Q(FRAC_BITS, ((coap_fixed_point_t){1,0}))

◆ FRAC_BITS

#define FRAC_BITS   6

The number of bits for the fractional part of ACK_TIMEOUT and ACK_RANDOM_FACTOR.

Must be less or equal 8.

Definition at line 66 of file net.c.

◆ INET6_ADDRSTRLEN

#define INET6_ADDRSTRLEN   40

Definition at line 55 of file net.c.

◆ MAX_BITS

#define MAX_BITS   8

The maximum number of bits for fixed point integers that are used for retransmission time calculation.

Currently this must be 8.

Definition at line 72 of file net.c.

◆ min

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

Definition at line 59 of file net.c.

◆ Q

#define Q (   frac,
  fval 
)
Value:
((uint16_t)(((1 << (frac)) * fval.integer_part) + \
((1 << (frac)) * fval.fractional_part + 500)/1000))

creates a Qx.frac from fval in coap_fixed_point_t

Definition at line 79 of file net.c.

◆ SHR_FP

#define SHR_FP (   val,
  frac 
)    (((val) + (1 << ((frac) - 1))) >> (frac))

◆ SZX_TO_BYTES

#define SZX_TO_BYTES (   SZX)    ((size_t)(1 << ((SZX) + 4)))

Definition at line 2048 of file net.c.

Enumeration Type Documentation

◆ respond_t

enum respond_t

Internal flags to control the treatment of responses (specifically in presence of the No-Response option).

Enumerator
RESPONSE_DEFAULT 
RESPONSE_DROP 
RESPONSE_SEND 

Definition at line 2230 of file net.c.

Function Documentation

◆ coap_accept_endpoint()

static int coap_accept_endpoint ( coap_context_t ctx,
coap_endpoint_t endpoint,
coap_tick_t  now 
)
static

Definition at line 1580 of file net.c.

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◆ coap_adjust_basetime()

unsigned int coap_adjust_basetime ( coap_context_t ctx,
coap_tick_t  now 
)

Set sendqueue_basetime in the given context object ctx to now.

This function returns the number of elements in the queue head that have timed out.

Definition at line 149 of file net.c.

◆ coap_calc_timeout()

unsigned int coap_calc_timeout ( coap_session_t session,
unsigned char  r 
)

Calculates the initial timeout based on the session CoAP transmission parameters 'ack_timeout', 'ack_random_factor', and COAP_TICKS_PER_SECOND.

The calculation requires 'ack_timeout' and 'ack_random_factor' to be in Qx.FRAC_BITS fixed point notation, whereas the passed parameter r is interpreted as the fractional part of a Q0.MAX_BITS random value.

Parameters
sessionsession timeout is associated with
rrandom value as fractional part of a Q0.MAX_BITS fixed point value
Returns
COAP_TICKS_PER_SECOND * 'ack_timeout' * (1 + ('ack_random_factor' - 1) * r)

Definition at line 902 of file net.c.

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◆ coap_can_exit()

int coap_can_exit ( coap_context_t context)

Returns 1 if there are no messages to send or to dispatch in the context's queues.

Definition at line 2895 of file net.c.

◆ coap_cancel()

static int coap_cancel ( coap_context_t context,
const coap_queue_t sent 
)
static

This function cancels outstanding messages for the session and token specified in sent.

Any observation relationship for sent->session and the token are removed. Calling this function is required when receiving an RST message (usually in response to a notification) or a GET request with the Observe option set to 1.

This function returns 0 when the token is unknown with this peer, or a value greater than zero otherwise.

Definition at line 2204 of file net.c.

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◆ coap_cancel_all_messages()

void coap_cancel_all_messages ( coap_context_t context,
coap_session_t session,
const uint8_t token,
size_t  token_length 
)

Cancels all outstanding messages for session session that have the specified token.

Parameters
contextThe context in use.
sessionSession of the messages to remove.
tokenMessage token.
token_lengthActual length of token.

Definition at line 1872 of file net.c.

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◆ coap_cancel_session_messages()

void coap_cancel_session_messages ( coap_context_t context,
coap_session_t session,
coap_nack_reason_t  reason 
)

Cancels all outstanding messages for session session.

Parameters
contextThe context in use.
sessionSession of the messages to remove.
reasonThe reasion for the session cancellation

Definition at line 1835 of file net.c.

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◆ coap_cleanup()

void coap_cleanup ( void  )

Definition at line 2937 of file net.c.

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◆ coap_connect_session()

static void coap_connect_session ( coap_context_t ctx,
coap_session_t session,
coap_tick_t  now 
)
static

Definition at line 1303 of file net.c.

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◆ coap_context_get_coap_fd()

int coap_context_get_coap_fd ( coap_context_t context)

Get the libcoap internal file descriptor for using in an application's select() or returned as an event in an application's epoll_wait() call.

Parameters
contextThe coap_context_t object.
Returns
The libcoap file descriptor or -1 if epoll is not available.

Definition at line 443 of file net.c.

◆ coap_context_set_keepalive()

void coap_context_set_keepalive ( coap_context_t context,
unsigned int  seconds 
)

Set the context keepalive timer for sessions.

A keepalive message will be sent after if a session has been inactive, i.e. no packet sent or received, for the given number of seconds. For unreliable protocols, a CoAP Empty message will be sent. If a CoAP RST is not received, the CoAP Empty messages will get resent based on the Confirmable retry parameters until there is a failure timeout, at which point the session will be considered as disconnected. For reliable protocols, a CoAP PING message will be sent. If a CoAP PONG has not been received before the next PING is due to be sent, the session will be considered as disconnected.

Parameters
contextThe coap_context_t object.
secondsNumber of seconds for the inactivity timer, or zero to disable CoAP-level keepalive messages.
Returns
1 if successful, else 0

Definition at line 439 of file net.c.

◆ coap_context_set_pki()

int coap_context_set_pki ( coap_context_t context,
const coap_dtls_pki_t setup_data 
)

Set the context's default PKI information for a server.

Parameters
contextThe current coap_context_t object.
setup_dataIf NULL, PKI authentication will fail. Certificate information required.
Returns
1 if successful, else 0.

Definition at line 414 of file net.c.

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◆ coap_context_set_pki_root_cas()

int coap_context_set_pki_root_cas ( coap_context_t context,
const char *  ca_file,
const char *  ca_dir 
)

Set the context's default Root CA information for a client or server.

Parameters
contextThe current coap_context_t object.
ca_fileIf not NULL, is the full path name of a PEM encoded file containing all the Root CAs to be used.
ca_dirIf not NULL, points to a directory containing PEM encoded files containing all the Root CAs to be used.
Returns
1 if successful, else 0.

Definition at line 429 of file net.c.

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◆ coap_context_set_psk()

int coap_context_set_psk ( coap_context_t context,
const char *  hint,
const uint8_t key,
size_t  key_len 
)

Set the context's default PSK hint and/or key for a server.

Parameters
contextThe current coap_context_t object.
hintThe default PSK server hint sent to a client. If NULL, PSK authentication is disabled. Empty string is a valid hint.
keyThe default PSK key. If NULL, PSK authentication will fail.
key_lenThe default PSK key's length. If 0, PSK authentication will fail.
Returns
1 if successful, else 0.

Definition at line 380 of file net.c.

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◆ coap_context_set_psk2()

int coap_context_set_psk2 ( coap_context_t context,
coap_dtls_spsk_t setup_data 
)

Set the context's default PSK hint and/or key for a server.

Parameters
contextThe current coap_context_t object.
setup_dataIf NULL, PSK authentication will fail. PSK information required.
Returns
1 if successful, else 0.

Definition at line 400 of file net.c.

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◆ coap_delete_all()

void coap_delete_all ( coap_queue_t queue)

Removes all items from given queue and frees the allocated storage.

Internal function.

Parameters
queueThe queue to delete.

Definition at line 243 of file net.c.

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◆ coap_delete_node()

int coap_delete_node ( coap_queue_t node)

Destroys specified node.

Parameters
nodeNode entry to remove.
Returns
1 node deleted from queue, 0 failure.

Definition at line 223 of file net.c.

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◆ coap_dispatch()

void coap_dispatch ( coap_context_t context,
coap_session_t session,
coap_pdu_t pdu 
)

Dispatches the PDUs from the receive queue in given context.

Definition at line 2713 of file net.c.

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◆ coap_find_transaction()

coap_queue_t* coap_find_transaction ( coap_queue_t queue,
coap_session_t session,
coap_tid_t  id 
)

Retrieves transaction from the queue.

Parameters
queueThe transaction queue to be searched.
sessionThe session to find.
idThe transaction id to find.
Returns
A pointer to the transaction object or NULL if not found.

Definition at line 1913 of file net.c.

◆ coap_free_context()

void coap_free_context ( coap_context_t context)

CoAP stack context must be released with coap_free_context().

This function clears all entries from the receive queue and send queue and deletes the resources that have been registered with context, and frees the attached endpoints.

Parameters
contextThe current coap_context_t object to free off.

Definition at line 581 of file net.c.

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◆ coap_free_node()

COAP_STATIC_INLINE void coap_free_node ( coap_queue_t node)

Definition at line 97 of file net.c.

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◆ coap_get_app_data()

void* coap_get_app_data ( const coap_context_t context)

Returns any application-specific data that has been stored with context using the function coap_set_app_data().

This function will return NULL if no data has been stored.

Parameters
contextThe CoAP context.
Returns
The data previously stored or NULL if not data stored.

Definition at line 575 of file net.c.

◆ coap_get_context_server_hint()

static size_t coap_get_context_server_hint ( const coap_session_t session,
uint8_t hint,
size_t  max_hint_len 
)
static

Definition at line 354 of file net.c.

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◆ coap_get_context_server_psk()

static size_t coap_get_context_server_psk ( const coap_session_t session,
const uint8_t identity,
size_t  identity_len,
uint8_t psk,
size_t  max_psk_len 
)
static

Definition at line 326 of file net.c.

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◆ coap_get_session_client_psk()

static size_t coap_get_session_client_psk ( const coap_session_t session,
const uint8_t hint,
size_t  hint_len,
uint8_t identity,
size_t *  identity_len,
size_t  max_identity_len,
uint8_t psk,
size_t  max_psk_len 
)
static

Definition at line 290 of file net.c.

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◆ coap_handle_dgram()

int coap_handle_dgram ( coap_context_t ctx,
coap_session_t session,
uint8_t data,
size_t  data_len 
)

Parses and interprets a CoAP datagram with context ctx.

This function returns 0 if the datagram was handled, or a value less than zero on error.

Parameters
ctxThe current CoAP context.
sessionThe current CoAP session.
dataThe received packet'd data.
data_lenThe received packet'd data length.
Returns
0 if message was handled successfully, or less than zero on error.

Definition at line 1749 of file net.c.

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◆ coap_handle_dgram_for_proto()

static int coap_handle_dgram_for_proto ( coap_context_t ctx,
coap_session_t session,
coap_packet_t packet 
)
static

Definition at line 1284 of file net.c.

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◆ coap_handle_event()

int coap_handle_event ( coap_context_t context,
coap_event_t  event,
coap_session_t session 
)

Invokes the event handler of context for the given event and data.

Parameters
contextThe CoAP context whose event handler is to be called.
eventThe event to deliver.
sessionThe session related to event.
Returns
The result from the associated event handler or 0 if none was registered.

Definition at line 2884 of file net.c.

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◆ coap_insert_node()

int coap_insert_node ( coap_queue_t **  queue,
coap_queue_t node 
)

Adds node to given queue, ordered by variable t in node.

Parameters
queueQueue to add to.
nodeNode entry to add to Queue.
Returns
1 added to queue, 0 failure.

Definition at line 186 of file net.c.

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◆ coap_join_mcast_group()

int coap_join_mcast_group ( coap_context_t ctx,
const char *  groupname 
)

Function interface for joining a multicast group for listening.

Parameters
ctxThe current context
groupnameThe name of the group that is to be joined for listening
Returns
0 on success, -1 on error

Definition at line 2946 of file net.c.

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◆ coap_malloc_node()

COAP_STATIC_INLINE coap_queue_t* coap_malloc_node ( void  )

Definition at line 92 of file net.c.

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◆ coap_new_context()

coap_context_t* coap_new_context ( const coap_address_t listen_addr)

Creates a new coap_context_t object that will hold the CoAP stack status.

Definition at line 453 of file net.c.

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◆ coap_new_error_response()

coap_pdu_t* coap_new_error_response ( coap_pdu_t request,
unsigned char  code,
coap_opt_filter_t  opts 
)

Creates a new ACK PDU with specified error code.

The options specified by the filter expression opts will be copied from the original request contained in request. Unless SHORT_ERROR_RESPONSE was defined at build time, the textual reason phrase for code will be added as payload, with Content-Type 0. This function returns a pointer to the new response message, or NULL on error. The storage allocated for the new message must be relased with coap_free().

Parameters
requestSpecification of the received (confirmable) request.
codeThe error code to set.
optsAn option filter that specifies which options to copy from the original request in node.
Returns
A pointer to the new message or NULL on error.

Definition at line 1921 of file net.c.

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◆ coap_new_node()

coap_queue_t* coap_new_node ( void  )

Creates a new node suitable for adding to the CoAP sendqueue.

Returns
New node entry, or NULL if failure.

Definition at line 252 of file net.c.

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◆ coap_option_check_critical()

int coap_option_check_critical ( coap_context_t ctx,
coap_pdu_t pdu,
coap_opt_filter_t  unknown 
)

Verifies that pdu contains no unknown critical options.

Options must be registered at ctx, using the function coap_register_option(). A basic set of options is registered automatically by coap_new_context(). This function returns 1 if pdu is ok, 0 otherwise. The given filter object unknown will be updated with the unknown options. As only COAP_MAX_OPT options can be signalled this way, remaining options must be examined manually.

coap_opt_filter_t f = COAP_OPT_NONE;
if (coap_option_check_critical(ctx, pdu, f) == 0) {
coap_option_iterator_init(pdu, &opt_iter, f);
while (coap_option_next(&opt_iter)) {
if (opt_iter.type & 0x01) {
... handle unknown critical option in opt_iter ...
}
}
}
uint16_t coap_opt_filter_t[COAP_OPT_FILTER_SIZE]
Fixed-size vector we use for option filtering.
Definition: option.h:119
coap_opt_t * coap_option_next(coap_opt_iterator_t *oi)
Updates the iterator oi to point to the next option.
Definition: option.c:146
coap_opt_iterator_t * coap_option_iterator_init(const coap_pdu_t *pdu, coap_opt_iterator_t *oi, const coap_opt_filter_t filter)
Initializes the given option iterator oi to point to the beginning of the pdu's option list.
Definition: option.c:110
int coap_option_check_critical(coap_context_t *ctx, coap_pdu_t *pdu, coap_opt_filter_t unknown)
Verifies that pdu contains no unknown critical options.
Definition: net.c:649
Iterator to run through PDU options.
Definition: option.h:186
uint16_t type
decoded option type
Definition: option.h:188
Parameters
ctxThe context where all known options are registered.
pduThe PDU to check.
unknownThe output filter that will be updated to indicate the unknown critical options found in pdu.
Returns
1 if everything was ok, 0 otherwise.

Definition at line 649 of file net.c.

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◆ coap_peek_next()

coap_queue_t* coap_peek_next ( coap_context_t context)

Returns the next pdu to send without removing from sendqeue.

Definition at line 266 of file net.c.

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◆ coap_pop_next()

coap_queue_t* coap_pop_next ( coap_context_t context)

Returns the next pdu to send and removes it from the sendqeue.

Definition at line 274 of file net.c.

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◆ coap_read_endpoint()

static int coap_read_endpoint ( coap_context_t ctx,
coap_endpoint_t endpoint,
coap_tick_t  now 
)
static

Definition at line 1529 of file net.c.

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◆ coap_read_session()

static void coap_read_session ( coap_context_t ctx,
coap_session_t session,
coap_tick_t  now 
)
static

Definition at line 1387 of file net.c.

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◆ coap_remove_from_queue()

int coap_remove_from_queue ( coap_queue_t **  queue,
coap_session_t session,
coap_tid_t  id,
coap_queue_t **  node 
)

This function removes the element with given id from the list given list.

If id was found, node is updated to point to the removed element. Note that the storage allocated by node is not released. The caller must do this manually using coap_delete_node(). This function returns 1 if the element with id id was found, 0 otherwise. For a return value of 0, the contents of node is undefined.

Parameters
queueThe queue to search for id.
sessionThe session to look for.
idThe transaction id to look for.
nodeIf found, node is updated to point to the removed node. You must release the storage pointed to by node manually.
Returns
1 if id was found, 0 otherwise.

Definition at line 1785 of file net.c.

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◆ coap_retransmit()

coap_tid_t coap_retransmit ( coap_context_t context,
coap_queue_t node 
)

Handles retransmissions of confirmable messages.

Parameters
contextThe CoAP context.
nodeThe node to retransmit.
Returns
The message id of the sent message or COAP_INVALID_TID on error.

Definition at line 1191 of file net.c.

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◆ coap_send()

coap_tid_t coap_send ( coap_session_t session,
coap_pdu_t pdu 
)

Sends a CoAP message to given peer.

The memory that is allocated by pdu will be released by coap_send(). The caller must not use the pdu after calling coap_send().

Parameters
sessionThe CoAP session.
pduThe CoAP PDU to send.
Returns
The message id of the sent message or COAP_INVALID_TID on error.

Definition at line 1006 of file net.c.

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◆ coap_send_ack()

coap_tid_t coap_send_ack ( coap_session_t session,
coap_pdu_t request 
)

Sends an ACK message with code 0 for the specified request to dst.

This function returns the corresponding transaction id if the message was sent or COAP_INVALID_TID on error.

Parameters
sessionThe CoAP session.
requestThe request to be acknowledged.
Returns
The transaction id if ACK was sent or COAP_INVALID_TID on error.

Definition at line 701 of file net.c.

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◆ coap_send_error()

coap_tid_t coap_send_error ( coap_session_t session,
coap_pdu_t request,
unsigned char  code,
coap_opt_filter_t  opts 
)

Sends an error response with code code for request request to dst.

opts will be passed to coap_new_error_response() to copy marked options from the request. This function returns the transaction id if the message was sent, or COAP_INVALID_TID otherwise.

Parameters
sessionThe CoAP session.
requestThe original request to respond to.
codeThe response code.
optsA filter that specifies the options to copy from the request.
Returns
The transaction id if the message was sent, or COAP_INVALID_TID otherwise.

Definition at line 858 of file net.c.

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◆ coap_send_message_type()

coap_tid_t coap_send_message_type ( coap_session_t session,
coap_pdu_t request,
unsigned char  type 
)

Helper funktion to create and send a message with type (usually ACK or RST).

This function returns COAP_INVALID_TID when the message was not sent, a valid transaction id otherwise.

Parameters
sessionThe CoAP session.
requestThe request that should be responded to.
typeWhich type to set.
Returns
transaction id on success or COAP_INVALID_TID otherwise.

Definition at line 876 of file net.c.

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◆ coap_send_pdu()

static ssize_t coap_send_pdu ( coap_session_t session,
coap_pdu_t pdu,
coap_queue_t node 
)
static

Definition at line 747 of file net.c.

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◆ coap_session_send_pdu()

ssize_t coap_session_send_pdu ( coap_session_t session,
coap_pdu_t pdu 
)

Send a pdu according to the session's protocol.

This function returns the number of bytes that have been transmitted, or a value less than zero on error.

Parameters
sessionSession to send pdu on.
pduThe pdu to send.
Returns
The number of bytes written on success, or a value less than zero on error.

Definition at line 715 of file net.c.

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◆ coap_set_app_data()

void coap_set_app_data ( coap_context_t context,
void *  data 
)

Stores data with the given CoAP context.

This function overwrites any value that has previously been stored with context.

Parameters
contextThe CoAP context.
dataThe data to store with wih the context. Note that this data must be valid during the lifetime of context.

Definition at line 569 of file net.c.

◆ coap_startup()

void coap_startup ( void  )

Definition at line 2917 of file net.c.

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◆ coap_wait_ack()

coap_tid_t coap_wait_ack ( coap_context_t context,
coap_session_t session,
coap_queue_t node 
)

Definition at line 928 of file net.c.

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◆ coap_wellknown_response()

coap_pdu_t* coap_wellknown_response ( coap_context_t context,
coap_session_t session,
coap_pdu_t request 
)

Creates a new response for given request with the contents of .well-known/core.

The result is NULL on error or a newly allocated PDU that must be either sent with coap_sent() or released by coap_delete_pdu().

Parameters
contextThe current coap context to use.
sessionThe CoAP session.
requestThe request for .well-known/core .
Returns
A new 2.05 response for .well-known/core or NULL on error.

Definition at line 2051 of file net.c.

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◆ coap_write_endpoint()

static int coap_write_endpoint ( coap_context_t ctx,
coap_endpoint_t endpoint,
coap_tick_t  now 
)
static

Definition at line 1572 of file net.c.

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◆ coap_write_session()

static void coap_write_session ( coap_context_t ctx,
coap_session_t session,
coap_tick_t  now 
)
static

Definition at line 1340 of file net.c.

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◆ get_wkc_len()

COAP_STATIC_INLINE size_t get_wkc_len ( coap_context_t context,
coap_opt_t query_filter 
)

Quick hack to determine the size of the resource description for .well-known/core.

Definition at line 2033 of file net.c.

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◆ handle_request()

static void handle_request ( coap_context_t context,
coap_session_t session,
coap_pdu_t pdu 
)
static

Definition at line 2301 of file net.c.

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◆ handle_response()

static void handle_response ( coap_context_t context,
coap_session_t session,
coap_pdu_t sent,
coap_pdu_t rcvd 
)
static

Definition at line 2653 of file net.c.

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◆ handle_signaling()

static void handle_signaling ( coap_context_t context,
coap_session_t session,
coap_pdu_t pdu 
)
static

Definition at line 2672 of file net.c.

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◆ no_response()

static enum respond_t no_response ( coap_pdu_t request,
coap_pdu_t response 
)
static

Checks for No-Response option in given request and returns 1 if response should be suppressed according to RFC 7967.

The value of the No-Response option is encoded as follows:

*  +-------+-----------------------+-----------------------------------+
*  | Value | Binary Representation |          Description              |
*  +-------+-----------------------+-----------------------------------+
*  |   0   |      <empty>          | Interested in all responses.      |
*  +-------+-----------------------+-----------------------------------+
*  |   2   |      00000010         | Not interested in 2.xx responses. |
*  +-------+-----------------------+-----------------------------------+
*  |   8   |      00001000         | Not interested in 4.xx responses. |
*  +-------+-----------------------+-----------------------------------+
*  |  16   |      00010000         | Not interested in 5.xx responses. |
*  +-------+-----------------------+-----------------------------------+
* 
Parameters
requestThe CoAP request to check for the No-Response option. This parameter must not be NULL.
responseThe response that is potentially suppressed. This parameter must not be NULL.
Returns
RESPONSE_DEFAULT when no special treatment is requested, RESPONSE_DROP when the response must be discarded, or RESPONSE_SEND when the response must be sent.

Definition at line 2204 of file net.c.

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◆ token_match()

COAP_STATIC_INLINE int token_match ( const uint8_t a,
size_t  alen,
const uint8_t b,
size_t  blen 
)

Definition at line 1829 of file net.c.

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Variable Documentation

◆ coap_default_uri_wellknown

coap_str_const_t coap_default_uri_wellknown
static
Initial value:
=
#define COAP_DEFAULT_URI_WELLKNOWN
well-known resources URI
Definition: pdu.h:70
unsigned char uint8_t
Definition: uthash.h:79

Definition at line 2296 of file net.c.

◆ coap_started

int coap_started = 0
static

Definition at line 2915 of file net.c.