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platform-espressif32/examples/espidf-coap-server/components/libcoap/src/coap_session.c
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Valerii Koval 4a461f5221 Update examples
2023-01-06 14:29:59 +02:00

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/* coap_session.c -- Session management for libcoap
*
* Copyright (C) 2017 Jean-Claue Michelou <jcm@spinetix.com>
* Copyright (C) 2022 Jon Shallow <supjps-libcoap@jpshallow.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*
* This file is part of the CoAP library libcoap. Please see
* README for terms of use.
*/
/**
* @file coap_session.c
* @brief Session handling functions
*/
#include "coap3/coap_internal.h"
#ifndef COAP_SESSION_C_
#define COAP_SESSION_C_
#include <stdio.h>
#ifdef COAP_EPOLL_SUPPORT
#include <sys/epoll.h>
#include <sys/timerfd.h>
#endif /* COAP_EPOLL_SUPPORT */
#include <errno.h>
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#else /* ! HAVE_INTTYPES_H */
#define PRIu32 "u"
#endif /* ! HAVE_INTTYPES_H */
void
coap_session_set_ack_timeout(coap_session_t *session, coap_fixed_point_t value) {
if (value.integer_part > 0 && value.fractional_part < 1000) {
session->ack_timeout = value;
coap_log(LOG_DEBUG, "***%s: session ack_timeout set to %u.%03u\n",
coap_session_str(session), session->ack_timeout.integer_part,
session->ack_timeout.fractional_part);
}
}
void
coap_session_set_ack_random_factor(coap_session_t *session,
coap_fixed_point_t value) {
if (value.integer_part > 0 && value.fractional_part < 1000) {
session->ack_random_factor = value;
coap_log(LOG_DEBUG, "***%s: session ack_random_factor set to %u.%03u\n",
coap_session_str(session), session->ack_random_factor.integer_part,
session->ack_random_factor.fractional_part);
}
}
void
coap_session_set_max_retransmit(coap_session_t *session, uint16_t value) {
if (value > 0) {
session->max_retransmit = value;
coap_log(LOG_DEBUG, "***%s: session max_retransmit set to %u\n",
coap_session_str(session), session->max_retransmit);
}
}
void
coap_session_set_nstart(coap_session_t *session, uint16_t value) {
if (value > 0) {
session->nstart = value;
coap_log(LOG_DEBUG, "***%s: session nstart set to %u\n",
coap_session_str(session), session->nstart);
}
}
void
coap_session_set_default_leisure(coap_session_t *session,
coap_fixed_point_t value) {
if (value.integer_part > 0 && value.fractional_part < 1000) {
session->default_leisure = value;
coap_log(LOG_DEBUG, "***%s: session default_leisure set to %u.%03u\n",
coap_session_str(session), session->default_leisure.integer_part,
session->default_leisure.fractional_part);
}
}
void
coap_session_set_probing_rate(coap_session_t *session, uint32_t value) {
if (value > 0) {
session->probing_rate = value;
coap_log(LOG_DEBUG, "***%s: session probing_rate set to %" PRIu32 "\n",
coap_session_str(session), session->probing_rate);
}
}
coap_fixed_point_t
coap_session_get_ack_timeout(const coap_session_t *session) {
return session->ack_timeout;
}
coap_fixed_point_t
coap_session_get_ack_random_factor(const coap_session_t *session) {
return session->ack_random_factor;
}
uint16_t
coap_session_get_max_retransmit(const coap_session_t *session) {
return session->max_retransmit;
}
uint16_t
coap_session_get_nstart(const coap_session_t *session) {
return session->nstart;
}
coap_fixed_point_t
coap_session_get_default_leisure(const coap_session_t *session) {
return session->default_leisure;
}
uint32_t
coap_session_get_probing_rate(const coap_session_t *session) {
return session->probing_rate;
}
coap_session_t *
coap_session_reference(coap_session_t *session) {
++session->ref;
return session;
}
void
coap_session_release(coap_session_t *session) {
if (session) {
#ifndef __COVERITY__
assert(session->ref > 0);
if (session->ref > 0)
--session->ref;
if (session->ref == 0 && session->type == COAP_SESSION_TYPE_CLIENT)
coap_session_free(session);
#else /* __COVERITY__ */
/* Coverity scan is fooled by the reference counter leading to
* false positives for USE_AFTER_FREE. */
--session->ref;
__coverity_negative_sink__(session->ref);
/* Indicate that resources are released properly. */
if (session->ref == 0 && session->type == COAP_SESSION_TYPE_CLIENT) {
__coverity_free__(session);
}
#endif /* __COVERITY__ */
}
}
void
coap_session_set_app_data(coap_session_t *session, void *app_data) {
assert(session);
session->app = app_data;
}
void *
coap_session_get_app_data(const coap_session_t *session) {
assert(session);
return session->app;
}
static coap_session_t *
coap_make_session(coap_proto_t proto, coap_session_type_t type,
const coap_addr_hash_t *addr_hash,
const coap_address_t *local_addr,
const coap_address_t *remote_addr, int ifindex,
coap_context_t *context, coap_endpoint_t *endpoint) {
coap_session_t *session = (coap_session_t*)coap_malloc_type(COAP_SESSION,
sizeof(coap_session_t));
#if ! COAP_SERVER_SUPPORT
(void)endpoint;
#endif /* ! COAP_SERVER_SUPPORT */
if (!session)
return NULL;
memset(session, 0, sizeof(*session));
session->proto = proto;
session->type = type;
if (addr_hash)
memcpy(&session->addr_hash, addr_hash, sizeof(session->addr_hash));
else
memset(&session->addr_hash, 0, sizeof(session->addr_hash));
if (local_addr)
coap_address_copy(&session->addr_info.local, local_addr);
else
coap_address_init(&session->addr_info.local);
if (remote_addr)
coap_address_copy(&session->addr_info.remote, remote_addr);
else
coap_address_init(&session->addr_info.remote);
session->ifindex = ifindex;
session->context = context;
#if COAP_SERVER_SUPPORT
session->endpoint = endpoint;
if (endpoint)
session->mtu = endpoint->default_mtu;
else
#endif /* COAP_SERVER_SUPPORT */
session->mtu = COAP_DEFAULT_MTU;
session->block_mode = context->block_mode;
if (proto == COAP_PROTO_DTLS) {
session->tls_overhead = 29;
if (session->tls_overhead >= session->mtu) {
session->tls_overhead = session->mtu;
coap_log(LOG_ERR, "DTLS overhead exceeds MTU\n");
}
}
session->ack_timeout = COAP_DEFAULT_ACK_TIMEOUT;
session->ack_random_factor = COAP_DEFAULT_ACK_RANDOM_FACTOR;
session->max_retransmit = COAP_DEFAULT_MAX_RETRANSMIT;
session->nstart = COAP_DEFAULT_NSTART;
session->default_leisure = COAP_DEFAULT_DEFAULT_LEISURE;
session->probing_rate = COAP_DEFAULT_PROBING_RATE;
session->dtls_event = -1;
session->last_ping_mid = COAP_INVALID_MID;
session->last_ack_mid = COAP_INVALID_MID;
session->last_con_mid = COAP_INVALID_MID;
/* Randomly initialize */
coap_prng((unsigned char *)&session->tx_mid, sizeof(session->tx_mid));
coap_prng((unsigned char *)&session->tx_rtag, sizeof(session->tx_rtag));
return session;
}
void coap_session_mfree(coap_session_t *session) {
coap_queue_t *q, *tmp;
coap_lg_xmit_t *lq, *ltmp;
#if COAP_CLIENT_SUPPORT
coap_lg_crcv_t *cq, *etmp;
/* Need to do this before (D)TLS and socket is closed down */
LL_FOREACH_SAFE(session->lg_crcv, cq, etmp) {
if (cq->observe_set && session->no_observe_cancel == 0) {
/* Need to close down observe */
if (coap_cancel_observe(session, cq->app_token, COAP_MESSAGE_NON)) {
/* Need to delete node we set up for NON */
coap_queue_t *queue = session->context->sendqueue;
while (queue) {
if (queue->session == session) {
coap_delete_node(queue);
break;
}
queue = queue->next;
}
}
}
LL_DELETE(session->lg_crcv, cq);
coap_block_delete_lg_crcv(session, cq);
}
#endif /* COAP_CLIENT_SUPPORT */
if (session->partial_pdu)
coap_delete_pdu(session->partial_pdu);
if (session->proto == COAP_PROTO_DTLS)
coap_dtls_free_session(session);
#if !COAP_DISABLE_TCP
else if (session->proto == COAP_PROTO_TLS)
coap_tls_free_session(session);
#endif /* !COAP_DISABLE_TCP */
if (session->sock.flags != COAP_SOCKET_EMPTY)
coap_socket_close(&session->sock);
if (session->psk_identity)
coap_free(session->psk_identity);
if (session->psk_key)
coap_free(session->psk_key);
if (session->psk_hint)
coap_free(session->psk_hint);
#if COAP_SERVER_SUPPORT
coap_cache_entry_t *cp, *ctmp;
HASH_ITER(hh, session->context->cache, cp, ctmp) {
/* cp->session is NULL if not session based */
if (cp->session == session) {
coap_delete_cache_entry(session->context, cp);
}
}
#endif /* COAP_SERVER_SUPPORT */
LL_FOREACH_SAFE(session->delayqueue, q, tmp) {
if (q->pdu->type==COAP_MESSAGE_CON && session->context && session->context->nack_handler)
session->context->nack_handler(session, q->pdu, session->proto == COAP_PROTO_DTLS ? COAP_NACK_TLS_FAILED : COAP_NACK_NOT_DELIVERABLE, q->id);
coap_delete_node(q);
}
LL_FOREACH_SAFE(session->lg_xmit, lq, ltmp) {
LL_DELETE(session->lg_xmit, lq);
coap_block_delete_lg_xmit(session, lq);
}
#if COAP_SERVER_SUPPORT
coap_lg_srcv_t *sq, *stmp;
LL_FOREACH_SAFE(session->lg_srcv, sq, stmp) {
LL_DELETE(session->lg_srcv, sq);
coap_block_delete_lg_srcv(session, sq);
}
#endif /* COAP_SERVER_SUPPORT */
}
void coap_session_free(coap_session_t *session) {
if (!session)
return;
assert(session->ref == 0);
if (session->ref)
return;
coap_session_mfree(session);
#if COAP_SERVER_SUPPORT
if (session->endpoint) {
if (session->endpoint->sessions)
SESSIONS_DELETE(session->endpoint->sessions, session);
} else
#endif /* COAP_SERVER_SUPPORT */
#if COAP_CLIENT_SUPPORT
if (session->context) {
if (session->context->sessions)
SESSIONS_DELETE(session->context->sessions, session);
}
#endif /* COAP_CLIENT_SUPPORT */
coap_delete_bin_const(session->last_token);
coap_log(LOG_DEBUG, "***%s: session %p: closed\n", coap_session_str(session),
(void *)session);
coap_free_type(COAP_SESSION, session);
}
static size_t
coap_session_max_pdu_size_internal(const coap_session_t *session,
size_t max_with_header) {
#if COAP_DISABLE_TCP
return max_with_header > 4 ? max_with_header - 4 : 0;
#else /* !COAP_DISABLE_TCP */
if (COAP_PROTO_NOT_RELIABLE(session->proto))
return max_with_header > 4 ? max_with_header - 4 : 0;
/* we must assume there is no token to be on the safe side */
if (max_with_header <= 2)
return 0;
else if (max_with_header <= COAP_MAX_MESSAGE_SIZE_TCP0 + 2)
return max_with_header - 2;
else if (max_with_header <= COAP_MAX_MESSAGE_SIZE_TCP8 + 3)
return max_with_header - 3;
else if (max_with_header <= COAP_MAX_MESSAGE_SIZE_TCP16 + 4)
return max_with_header - 4;
else
return max_with_header - 6;
#endif /* !COAP_DISABLE_TCP */
}
size_t
coap_session_max_pdu_rcv_size(const coap_session_t *session) {
if (session->csm_rcv_mtu)
return coap_session_max_pdu_size_internal(session,
(size_t)(session->csm_rcv_mtu));
return coap_session_max_pdu_size_internal(session,
(size_t)(session->mtu - session->tls_overhead));
}
size_t
coap_session_max_pdu_size(const coap_session_t *session) {
size_t max_with_header;
#if COAP_CLIENT_SUPPORT
/*
* Delay if session->doing_first is set.
* E.g. Reliable and CSM not in yet for checking block support
*/
coap_session_t *session_rw;
/*
* Need to do this to not get a compiler warning about const parameters
* but need to maintain source code backward compatibility
*/
memcpy(&session_rw, &session, sizeof(session_rw));
if (coap_client_delay_first(session_rw) == 0) {
coap_log(LOG_DEBUG, "coap_client_delay_first: timeout\n");
/* Have to go with the defaults */
}
#endif /* COAP_CLIENT_SUPPORT */
max_with_header = (size_t)(session->mtu - session->tls_overhead);
return coap_session_max_pdu_size_internal(session, max_with_header);
}
void coap_session_set_mtu(coap_session_t *session, unsigned mtu) {
#if defined(WITH_CONTIKI) || defined(WITH_LWIP)
if (mtu > COAP_MAX_MESSAGE_SIZE_TCP16 + 4)
mtu = COAP_MAX_MESSAGE_SIZE_TCP16 + 4;
#endif
if (mtu < 64)
mtu = 64;
session->mtu = mtu;
if (session->tls_overhead >= session->mtu) {
session->tls_overhead = session->mtu;
coap_log(LOG_ERR, "DTLS overhead exceeds MTU\n");
}
}
ssize_t coap_session_send(coap_session_t *session, const uint8_t *data, size_t datalen) {
ssize_t bytes_written;
coap_socket_t *sock = &session->sock;
#if COAP_SERVER_SUPPORT
if (sock->flags == COAP_SOCKET_EMPTY) {
assert(session->endpoint != NULL);
sock = &session->endpoint->sock;
}
#endif /* COAP_SERVER_SUPPORT */
bytes_written = coap_socket_send(sock, session, data, datalen);
if (bytes_written == (ssize_t)datalen) {
coap_ticks(&session->last_rx_tx);
coap_log(LOG_DEBUG, "* %s: sent %zd bytes\n",
coap_session_str(session), datalen);
} else {
coap_log(LOG_DEBUG, "* %s: failed to send %zd bytes\n",
coap_session_str(session), datalen);
}
return bytes_written;
}
ssize_t coap_session_write(coap_session_t *session, const uint8_t *data, size_t datalen) {
ssize_t bytes_written = coap_socket_write(&session->sock, data, datalen);
if (bytes_written > 0) {
coap_ticks(&session->last_rx_tx);
coap_log(LOG_DEBUG, "* %s: sent %zd bytes\n",
coap_session_str(session), bytes_written);
} else if (bytes_written < 0) {
coap_log(LOG_DEBUG, "* %s: failed to send %zd bytes\n",
coap_session_str(session), datalen );
}
return bytes_written;
}
ssize_t
coap_session_delay_pdu(coap_session_t *session, coap_pdu_t *pdu,
coap_queue_t *node)
{
if ( node ) {
coap_queue_t *removed = NULL;
coap_remove_from_queue(&session->context->sendqueue, session, node->id, &removed);
assert(removed == node);
coap_session_release(node->session);
node->session = NULL;
node->t = 0;
} else {
if (COAP_PROTO_NOT_RELIABLE(session->proto)) {
coap_queue_t *q = NULL;
/* Check same mid is not getting re-used in violation of RFC7252 */
LL_FOREACH(session->delayqueue, q) {
if (q->id == pdu->mid) {
coap_log(LOG_ERR, "** %s: mid=0x%x: already in-use - dropped\n",
coap_session_str(session), pdu->mid);
return COAP_INVALID_MID;
}
}
}
node = coap_new_node();
if (node == NULL)
return COAP_INVALID_MID;
node->id = pdu->mid;
node->pdu = pdu;
if (pdu->type == COAP_MESSAGE_CON && COAP_PROTO_NOT_RELIABLE(session->proto)) {
uint8_t r;
coap_prng(&r, sizeof(r));
/* add timeout in range [ACK_TIMEOUT...ACK_TIMEOUT * ACK_RANDOM_FACTOR] */
node->timeout = coap_calc_timeout(session, r);
}
}
LL_APPEND(session->delayqueue, node);
coap_log(LOG_DEBUG, "** %s: mid=0x%x: delayed\n",
coap_session_str(session), node->id);
return COAP_PDU_DELAYED;
}
#if !COAP_DISABLE_TCP
void coap_session_send_csm(coap_session_t *session) {
coap_pdu_t *pdu;
uint8_t buf[4];
assert(COAP_PROTO_RELIABLE(session->proto));
coap_log(LOG_DEBUG, "***%s: sending CSM\n", coap_session_str(session));
session->state = COAP_SESSION_STATE_CSM;
session->partial_write = 0;
if (session->mtu == 0)
session->mtu = COAP_DEFAULT_MTU; /* base value */
pdu = coap_pdu_init(COAP_MESSAGE_CON, COAP_SIGNALING_CODE_CSM, 0, 20);
if ( pdu == NULL
|| coap_add_option_internal(pdu, COAP_SIGNALING_OPTION_MAX_MESSAGE_SIZE,
coap_encode_var_safe(buf, sizeof(buf),
session->context->csm_max_message_size), buf) == 0
|| coap_add_option_internal(pdu, COAP_SIGNALING_OPTION_BLOCK_WISE_TRANSFER,
coap_encode_var_safe(buf, sizeof(buf),
0), buf) == 0
|| coap_pdu_encode_header(pdu, session->proto) == 0
) {
coap_session_disconnected(session, COAP_NACK_NOT_DELIVERABLE);
} else {
ssize_t bytes_written = coap_session_send_pdu(session, pdu);
if (bytes_written != (ssize_t)pdu->used_size + pdu->hdr_size) {
coap_session_disconnected(session, COAP_NACK_NOT_DELIVERABLE);
} else {
session->csm_rcv_mtu = session->context->csm_max_message_size;
if (session->csm_rcv_mtu > COAP_BERT_BASE)
session->csm_bert_loc_support = 1;
else
session->csm_bert_loc_support = 0;
}
}
if (pdu)
coap_delete_pdu(pdu);
}
#endif /* !COAP_DISABLE_TCP */
coap_mid_t coap_session_send_ping(coap_session_t *session) {
coap_pdu_t *ping = NULL;
if (session->state != COAP_SESSION_STATE_ESTABLISHED)
return COAP_INVALID_MID;
if (COAP_PROTO_NOT_RELIABLE(session->proto)) {
uint16_t mid = coap_new_message_id (session);
ping = coap_pdu_init(COAP_MESSAGE_CON, 0, mid, 0);
}
#if !COAP_DISABLE_TCP
else {
ping = coap_pdu_init(COAP_MESSAGE_CON, COAP_SIGNALING_CODE_PING, 0, 1);
}
#endif /* !COAP_DISABLE_TCP */
if (!ping)
return COAP_INVALID_MID;
return coap_send_internal(session, ping);
}
void coap_session_connected(coap_session_t *session) {
if (session->state != COAP_SESSION_STATE_ESTABLISHED) {
coap_log(LOG_DEBUG, "***%s: session connected\n",
coap_session_str(session));
if (session->state == COAP_SESSION_STATE_CSM)
coap_handle_event(session->context, COAP_EVENT_SESSION_CONNECTED, session);
if (session->doing_first)
session->doing_first = 0;
}
session->state = COAP_SESSION_STATE_ESTABLISHED;
session->partial_write = 0;
if ( session->proto==COAP_PROTO_DTLS) {
session->tls_overhead = coap_dtls_get_overhead(session);
if (session->tls_overhead >= session->mtu) {
session->tls_overhead = session->mtu;
coap_log(LOG_ERR, "DTLS overhead exceeds MTU\n");
}
}
while (session->delayqueue && session->state == COAP_SESSION_STATE_ESTABLISHED) {
ssize_t bytes_written;
coap_queue_t *q = session->delayqueue;
if (q->pdu->type == COAP_MESSAGE_CON && COAP_PROTO_NOT_RELIABLE(session->proto)) {
if (session->con_active >= COAP_NSTART(session))
break;
session->con_active++;
}
/* Take entry off the queue */
session->delayqueue = q->next;
q->next = NULL;
coap_log(LOG_DEBUG, "** %s: mid=0x%x: transmitted after delay\n",
coap_session_str(session), (int)q->pdu->mid);
bytes_written = coap_session_send_pdu(session, q->pdu);
if (q->pdu->type == COAP_MESSAGE_CON && COAP_PROTO_NOT_RELIABLE(session->proto)) {
if (coap_wait_ack(session->context, session, q) >= 0)
q = NULL;
}
if (COAP_PROTO_NOT_RELIABLE(session->proto)) {
if (q)
coap_delete_node(q);
if (bytes_written < 0)
break;
} else {
if (bytes_written <= 0 || (size_t)bytes_written < q->pdu->used_size + q->pdu->hdr_size) {
q->next = session->delayqueue;
session->delayqueue = q;
if (bytes_written > 0)
session->partial_write = (size_t)bytes_written;
break;
} else {
coap_delete_node(q);
}
}
}
}
void coap_session_disconnected(coap_session_t *session, coap_nack_reason_t reason) {
#if !COAP_DISABLE_TCP
coap_session_state_t state = session->state;
#endif /* !COAP_DISABLE_TCP */
coap_log(LOG_DEBUG, "***%s: session disconnected (reason %d)\n",
coap_session_str(session), reason);
#if COAP_SERVER_SUPPORT
coap_delete_observers( session->context, session );
#endif /* COAP_SERVER_SUPPORT */
if ( session->tls) {
if (session->proto == COAP_PROTO_DTLS)
coap_dtls_free_session(session);
#if !COAP_DISABLE_TCP
else if (session->proto == COAP_PROTO_TLS)
coap_tls_free_session(session);
#endif /* !COAP_DISABLE_TCP */
session->tls = NULL;
}
if (session->proto == COAP_PROTO_UDP)
session->state = COAP_SESSION_STATE_ESTABLISHED;
else
session->state = COAP_SESSION_STATE_NONE;
session->con_active = 0;
if (session->partial_pdu) {
coap_delete_pdu(session->partial_pdu);
session->partial_pdu = NULL;
}
session->partial_read = 0;
while (session->delayqueue) {
coap_queue_t *q = session->delayqueue;
session->delayqueue = q->next;
q->next = NULL;
coap_log(LOG_DEBUG, "** %s: mid=0x%x: not transmitted after disconnect\n",
coap_session_str(session), q->id);
if (q->pdu->type==COAP_MESSAGE_CON
&& COAP_PROTO_NOT_RELIABLE(session->proto)
&& reason == COAP_NACK_ICMP_ISSUE)
{
/* Make sure that we try a re-transmit later on ICMP error */
if (coap_wait_ack(session->context, session, q) >= 0) {
if (session->context->nack_handler) {
session->context->nack_handler(session, q->pdu, reason, q->id);
}
q = NULL;
}
}
if (q && q->pdu->type == COAP_MESSAGE_CON
&& session->context->nack_handler)
{
session->context->nack_handler(session, q->pdu, reason, q->id);
}
if (q)
coap_delete_node(q);
}
if (reason != COAP_NACK_ICMP_ISSUE) {
coap_cancel_session_messages(session->context, session, reason);
}
else if (session->context->nack_handler) {
coap_queue_t *q = session->context->sendqueue;
while (q) {
if (q->session == session) {
session->context->nack_handler(session, q->pdu, reason, q->id);
}
q = q->next;
}
}
#if !COAP_DISABLE_TCP
if (COAP_PROTO_RELIABLE(session->proto)) {
if (session->sock.flags != COAP_SOCKET_EMPTY) {
coap_socket_close(&session->sock);
coap_handle_event(session->context,
state == COAP_SESSION_STATE_CONNECTING ?
COAP_EVENT_TCP_FAILED : COAP_EVENT_TCP_CLOSED, session);
}
if (state != COAP_SESSION_STATE_NONE) {
coap_handle_event(session->context,
state == COAP_SESSION_STATE_ESTABLISHED ?
COAP_EVENT_SESSION_CLOSED : COAP_EVENT_SESSION_FAILED, session);
}
if (session->doing_first)
session->doing_first = 0;
}
#endif /* !COAP_DISABLE_TCP */
}
#if COAP_SERVER_SUPPORT
static void
coap_make_addr_hash(coap_addr_hash_t *addr_hash, coap_proto_t proto,
const coap_addr_tuple_t *addr_info) {
memset(addr_hash, 0, sizeof(coap_addr_hash_t));
coap_address_copy(&addr_hash->remote, &addr_info->remote);
addr_hash->lport = coap_address_get_port(&addr_info->local);
addr_hash->proto = proto;
}
coap_session_t *
coap_endpoint_get_session(coap_endpoint_t *endpoint,
const coap_packet_t *packet, coap_tick_t now) {
coap_session_t *session;
coap_session_t *rtmp;
unsigned int num_idle = 0;
unsigned int num_hs = 0;
coap_session_t *oldest = NULL;
coap_session_t *oldest_hs = NULL;
coap_addr_hash_t addr_hash;
coap_make_addr_hash(&addr_hash, endpoint->proto, &packet->addr_info);
SESSIONS_FIND(endpoint->sessions, addr_hash, session);
if (session) {
/* Maybe mcast or unicast IP address which is not in the hash */
coap_address_copy(&session->addr_info.local, &packet->addr_info.local);
session->ifindex = packet->ifindex;
session->last_rx_tx = now;
return session;
}
SESSIONS_ITER(endpoint->sessions, session, rtmp) {
if (session->ref == 0 && session->delayqueue == NULL) {
if (session->type == COAP_SESSION_TYPE_SERVER) {
++num_idle;
if (oldest==NULL || session->last_rx_tx < oldest->last_rx_tx)
oldest = session;
if (session->state == COAP_SESSION_STATE_HANDSHAKE) {
++num_hs;
/* See if this is a partial (D)TLS session set up
which needs to be cleared down to prevent DOS */
if ((session->last_rx_tx + COAP_PARTIAL_SESSION_TIMEOUT_TICKS) < now) {
if (oldest_hs == NULL ||
session->last_rx_tx < oldest_hs->last_rx_tx)
oldest_hs = session;
}
}
}
else if (session->type == COAP_SESSION_TYPE_HELLO) {
++num_hs;
/* See if this is a partial (D)TLS session set up for Client Hello
which needs to be cleared down to prevent DOS */
if ((session->last_rx_tx + COAP_PARTIAL_SESSION_TIMEOUT_TICKS) < now) {
if (oldest_hs == NULL ||
session->last_rx_tx < oldest_hs->last_rx_tx)
oldest_hs = session;
}
}
}
}
if (endpoint->context->max_idle_sessions > 0 &&
num_idle >= endpoint->context->max_idle_sessions) {
coap_handle_event(oldest->context, COAP_EVENT_SERVER_SESSION_DEL, oldest);
coap_session_free(oldest);
}
else if (oldest_hs) {
coap_log(LOG_WARNING, "***%s: Incomplete session timed out\n",
coap_session_str(oldest_hs));
coap_handle_event(oldest_hs->context, COAP_EVENT_SERVER_SESSION_DEL, oldest_hs);
coap_session_free(oldest_hs);
}
if (num_hs > (endpoint->context->max_handshake_sessions ?
endpoint->context->max_handshake_sessions :
COAP_DEFAULT_MAX_HANDSHAKE_SESSIONS)) {
/* Maxed out on number of sessions in (D)TLS negotiation state */
coap_log(LOG_DEBUG,
"Oustanding sessions in COAP_SESSION_STATE_HANDSHAKE too "
"large. New request ignored\n");
return NULL;
}
if (endpoint->proto == COAP_PROTO_DTLS) {
/*
* Need to check that this actually is a Client Hello before wasting
* time allocating and then freeing off session.
*/
/*
* Generic header structure of the DTLS record layer.
* typedef struct __attribute__((__packed__)) {
* uint8_t content_type; content type of the included message
* uint16_t version; Protocol version
* uint16_t epoch; counter for cipher state changes
* uint8_t sequence_number[6]; sequence number
* uint16_t length; length of the following fragment
* uint8_t handshake; If content_type == DTLS_CT_HANDSHAKE
* } dtls_record_handshake_t;
*/
#define OFF_CONTENT_TYPE 0 /* offset of content_type in dtls_record_handshake_t */
#define DTLS_CT_ALERT 21 /* Content Type Alert */
#define DTLS_CT_HANDSHAKE 22 /* Content Type Handshake */
#define OFF_HANDSHAKE_TYPE 13 /* offset of handshake in dtls_record_handshake_t */
#define DTLS_HT_CLIENT_HELLO 1 /* Client Hello handshake type */
#ifdef WITH_LWIP
const uint8_t *payload = (const uint8_t*)packet->pbuf->payload;
size_t length = packet->pbuf->len;
#else /* ! WITH_LWIP */
const uint8_t *payload = (const uint8_t*)packet->payload;
size_t length = packet->length;
#endif /* ! WITH_LWIP */
if (length < (OFF_HANDSHAKE_TYPE + 1)) {
coap_log(LOG_DEBUG,
"coap_dtls_hello: ContentType %d Short Packet (%zu < %d) dropped\n",
payload[OFF_CONTENT_TYPE], length,
OFF_HANDSHAKE_TYPE + 1);
return NULL;
}
if (payload[OFF_CONTENT_TYPE] != DTLS_CT_HANDSHAKE ||
payload[OFF_HANDSHAKE_TYPE] != DTLS_HT_CLIENT_HELLO) {
/* only log if not a late alert */
if (payload[OFF_CONTENT_TYPE] != DTLS_CT_ALERT)
coap_log(LOG_DEBUG,
"coap_dtls_hello: ContentType %d Handshake %d dropped\n",
payload[OFF_CONTENT_TYPE], payload[OFF_HANDSHAKE_TYPE]);
return NULL;
}
}
session = coap_make_session(endpoint->proto, COAP_SESSION_TYPE_SERVER,
&addr_hash, &packet->addr_info.local,
&packet->addr_info.remote,
packet->ifindex, endpoint->context, endpoint);
if (session) {
session->last_rx_tx = now;
if (endpoint->proto == COAP_PROTO_UDP)
session->state = COAP_SESSION_STATE_ESTABLISHED;
else if (endpoint->proto == COAP_PROTO_DTLS) {
session->type = COAP_SESSION_TYPE_HELLO;
}
SESSIONS_ADD(endpoint->sessions, session);
coap_log(LOG_DEBUG, "***%s: session %p: new incoming session\n",
coap_session_str(session), (void *)session);
coap_handle_event(session->context, COAP_EVENT_SERVER_SESSION_NEW, session);
}
return session;
}
coap_session_t *
coap_session_new_dtls_session(coap_session_t *session,
coap_tick_t now) {
if (session) {
session->last_rx_tx = now;
session->type = COAP_SESSION_TYPE_SERVER;
session->tls = coap_dtls_new_server_session(session);
if (session->tls) {
session->state = COAP_SESSION_STATE_HANDSHAKE;
} else {
coap_session_free(session);
session = NULL;
}
}
return session;
}
#endif /* COAP_SERVER_SUPPORT */
#ifdef COAP_EPOLL_SUPPORT
static void
coap_epoll_ctl_add(coap_socket_t *sock,
uint32_t events,
const char *func
) {
int ret;
struct epoll_event event;
coap_context_t *context;
if (sock == NULL)
return;
#if COAP_SERVER_SUPPORT
context = sock->session ? sock->session->context :
sock->endpoint ? sock->endpoint->context : NULL;
#else /* ! COAP_SERVER_SUPPORT */
context = sock->session ? sock->session->context : NULL;
#endif /* ! COAP_SERVER_SUPPORT */
if (context == NULL)
return;
/* Needed if running 32bit as ptr is only 32bit */
memset(&event, 0, sizeof(event));
event.events = events;
event.data.ptr = sock;
ret = epoll_ctl(context->epfd, EPOLL_CTL_ADD, sock->fd, &event);
if (ret == -1) {
coap_log(LOG_ERR,
"%s: epoll_ctl ADD failed: %s (%d)\n",
func,
coap_socket_strerror(), errno);
}
}
#endif /* COAP_EPOLL_SUPPORT */
#if COAP_CLIENT_SUPPORT
static coap_session_t *
coap_session_create_client(
coap_context_t *ctx,
const coap_address_t *local_if,
const coap_address_t *server,
coap_proto_t proto
) {
coap_session_t *session = NULL;
assert(server);
switch(proto) {
case COAP_PROTO_UDP:
break;
case COAP_PROTO_DTLS:
if (!coap_dtls_is_supported()) {
coap_log(LOG_CRIT, "coap_new_client_session*: DTLS not supported\n");
return NULL;
}
break;
case COAP_PROTO_TCP:
if (!coap_tcp_is_supported()) {
coap_log(LOG_CRIT, "coap_new_client_session*: TCP not supported\n");
return NULL;
}
break;
case COAP_PROTO_TLS:
if (!coap_tls_is_supported()) {
coap_log(LOG_CRIT, "coap_new_client_session*: TLS not supported\n");
return NULL;
}
break;
case COAP_PROTO_NONE:
default:
assert(0);
break;
}
session = coap_make_session(proto, COAP_SESSION_TYPE_CLIENT, NULL,
local_if, server, 0, ctx, NULL);
if (!session)
goto error;
coap_session_reference(session);
if (proto == COAP_PROTO_UDP || proto == COAP_PROTO_DTLS) {
coap_session_t *s, *rtmp;
if (!coap_socket_connect_udp(&session->sock, local_if, server,
proto == COAP_PROTO_DTLS ? COAPS_DEFAULT_PORT : COAP_DEFAULT_PORT,
&session->addr_info.local, &session->addr_info.remote)) {
goto error;
}
/* Check that this is not a duplicate 4-tuple */
SESSIONS_ITER_SAFE(ctx->sessions, s, rtmp) {
if ((s->proto == COAP_PROTO_UDP || s->proto == COAP_PROTO_DTLS) &&
coap_address_equals(&session->addr_info.local,
&s->addr_info.local) &&
coap_address_equals(&session->addr_info.remote,
&s->addr_info.remote)) {
coap_log(LOG_WARNING, "***%s: session %p: duplicate - already exists\n",
coap_session_str(session), (void *)session);
goto error;
}
}
#if !COAP_DISABLE_TCP
} else if (proto == COAP_PROTO_TCP || proto == COAP_PROTO_TLS) {
if (!coap_socket_connect_tcp1(&session->sock, local_if, server,
proto == COAP_PROTO_TLS ? COAPS_DEFAULT_PORT : COAP_DEFAULT_PORT,
&session->addr_info.local, &session->addr_info.remote)) {
goto error;
}
#endif /* !COAP_DISABLE_TCP */
}
#ifdef COAP_EPOLL_SUPPORT
session->sock.session = session;
coap_epoll_ctl_add(&session->sock,
EPOLLIN |
((session->sock.flags & COAP_SOCKET_WANT_CONNECT) ?
EPOLLOUT : 0),
__func__);
#endif /* COAP_EPOLL_SUPPORT */
session->sock.flags |= COAP_SOCKET_NOT_EMPTY | COAP_SOCKET_WANT_READ;
if (local_if)
session->sock.flags |= COAP_SOCKET_BOUND;
#if COAP_SERVER_SUPPORT
if (ctx->proxy_uri_resource)
session->proxy_session = 1;
#endif /* COAP_SERVER_SUPPORT */
SESSIONS_ADD(ctx->sessions, session);
return session;
error:
/*
* Need to add in the session as coap_session_release()
* will call SESSIONS_DELETE in coap_session_free().
*/
if (session)
SESSIONS_ADD(ctx->sessions, session);
coap_session_release(session);
return NULL;
}
static coap_session_t *
coap_session_connect(coap_session_t *session) {
if (session->proto == COAP_PROTO_UDP) {
session->state = COAP_SESSION_STATE_ESTABLISHED;
} else if (session->proto == COAP_PROTO_DTLS) {
session->tls = coap_dtls_new_client_session(session);
if (session->tls) {
session->state = COAP_SESSION_STATE_HANDSHAKE;
} else {
/* Need to free session object. As a new session may not yet
* have been referenced, we call coap_session_reference() first
* before trying to release the object.
*/
coap_session_reference(session);
coap_session_release(session);
return NULL;
}
#if !COAP_DISABLE_TCP
} else {
if (session->proto == COAP_PROTO_TCP || session->proto == COAP_PROTO_TLS) {
if (session->sock.flags & COAP_SOCKET_WANT_CONNECT) {
session->state = COAP_SESSION_STATE_CONNECTING;
if (session->state != COAP_SESSION_STATE_ESTABLISHED &&
session->state != COAP_SESSION_STATE_NONE &&
COAP_PROTO_RELIABLE(session->proto) &&
session->type == COAP_SESSION_TYPE_CLIENT) {
session->doing_first = 1;
}
} else if (session->proto == COAP_PROTO_TLS) {
int connected = 0;
session->tls = coap_tls_new_client_session(session, &connected);
if (session->tls) {
session->state = COAP_SESSION_STATE_HANDSHAKE;
if (connected)
coap_session_send_csm(session);
} else {
/* Need to free session object. As a new session may not yet
* have been referenced, we call coap_session_reference()
* first before trying to release the object.
*/
coap_session_reference(session);
coap_session_release(session);
return NULL;
}
} else {
coap_session_send_csm(session);
}
}
#endif /* !COAP_DISABLE_TCP */
}
coap_ticks(&session->last_rx_tx);
return session;
}
#endif /* COAP_CLIENT_SUPPORT */
#if COAP_SERVER_SUPPORT
static coap_session_t *
coap_session_accept(coap_session_t *session) {
#if !COAP_DISABLE_TCP
if (session->proto == COAP_PROTO_TCP || session->proto == COAP_PROTO_TLS)
coap_handle_event(session->context, COAP_EVENT_TCP_CONNECTED, session);
if (session->proto == COAP_PROTO_TCP) {
coap_session_send_csm(session);
} else if (session->proto == COAP_PROTO_TLS) {
int connected = 0;
session->tls = coap_tls_new_server_session(session, &connected);
if (session->tls) {
session->state = COAP_SESSION_STATE_HANDSHAKE;
if (connected) {
coap_handle_event(session->context, COAP_EVENT_DTLS_CONNECTED, session);
coap_session_send_csm(session);
}
} else {
/* Need to free session object. As a new session may not yet
* have been referenced, we call coap_session_reference() first
* before trying to release the object.
*/
coap_session_reference(session);
coap_session_release(session);
session = NULL;
}
}
#endif /* COAP_DISABLE_TCP */
return session;
}
#endif /* COAP_SERVER_SUPPORT */
#if COAP_CLIENT_SUPPORT
coap_session_t *coap_new_client_session(
coap_context_t *ctx,
const coap_address_t *local_if,
const coap_address_t *server,
coap_proto_t proto
) {
coap_session_t *session = coap_session_create_client(ctx, local_if, server,
proto);
if (session) {
coap_log(LOG_DEBUG, "***%s: session %p: created outgoing session\n",
coap_session_str(session), (void *)session);
session = coap_session_connect(session);
}
return session;
}
coap_session_t *coap_new_client_session_psk(
coap_context_t *ctx,
const coap_address_t *local_if,
const coap_address_t *server,
coap_proto_t proto,
const char *identity,
const uint8_t *key,
unsigned key_len
) {
coap_dtls_cpsk_t setup_data;
memset (&setup_data, 0, sizeof(setup_data));
setup_data.version = COAP_DTLS_CPSK_SETUP_VERSION;
if (identity) {
setup_data.psk_info.identity.s = (const uint8_t *)identity;
setup_data.psk_info.identity.length = strlen(identity);
}
if (key && key_len > 0) {
setup_data.psk_info.key.s = key;
setup_data.psk_info.key.length = key_len;
}
return coap_new_client_session_psk2(ctx, local_if, server,
proto, &setup_data);
}
coap_session_t *coap_new_client_session_psk2(
coap_context_t *ctx,
const coap_address_t *local_if,
const coap_address_t *server,
coap_proto_t proto,
coap_dtls_cpsk_t *setup_data
) {
coap_session_t *session = coap_session_create_client(ctx, local_if,
server, proto);
if (!session)
return NULL;
session->cpsk_setup_data = *setup_data;
if (setup_data->psk_info.identity.s) {
session->psk_identity =
coap_new_bin_const(setup_data->psk_info.identity.s,
setup_data->psk_info.identity.length);
if (!session->psk_identity) {
coap_log(LOG_WARNING, "Cannot store session Identity (PSK)\n");
coap_session_release(session);
return NULL;
}
}
else if (coap_dtls_is_supported() || coap_tls_is_supported()) {
coap_log(LOG_WARNING, "Identity (PSK) not defined\n");
coap_session_release(session);
return NULL;
}
if (setup_data->psk_info.key.s && setup_data->psk_info.key.length > 0) {
session->psk_key = coap_new_bin_const(setup_data->psk_info.key.s,
setup_data->psk_info.key.length);
if (!session->psk_key) {
coap_log(LOG_WARNING, "Cannot store session pre-shared key (PSK)\n");
coap_session_release(session);
return NULL;
}
}
else if (coap_dtls_is_supported() || coap_tls_is_supported()) {
coap_log(LOG_WARNING, "Pre-shared key (PSK) not defined\n");
coap_session_release(session);
return NULL;
}
if (coap_dtls_is_supported() || coap_tls_is_supported()) {
if (!coap_dtls_context_set_cpsk(ctx, setup_data)) {
coap_session_release(session);
return NULL;
}
}
coap_log(LOG_DEBUG, "***%s: new outgoing session\n",
coap_session_str(session));
return coap_session_connect(session);
}
#endif /* ! COAP_CLIENT_SUPPORT */
int
coap_session_refresh_psk_hint(coap_session_t *session,
const coap_bin_const_t *psk_hint
) {
/* We may be refreshing the hint with the same hint */
coap_bin_const_t *old_psk_hint = session->psk_hint;
if (psk_hint && psk_hint->s) {
if (session->psk_hint) {
if (coap_binary_equal(session->psk_hint, psk_hint))
return 1;
}
session->psk_hint = coap_new_bin_const(psk_hint->s,
psk_hint->length);
if (!session->psk_hint) {
coap_log(LOG_ERR, "No memory to store identity hint (PSK)\n");
if (old_psk_hint)
coap_delete_bin_const(old_psk_hint);
return 0;
}
}
else {
session->psk_hint = NULL;
}
if (old_psk_hint)
coap_delete_bin_const(old_psk_hint);
return 1;
}
int
coap_session_refresh_psk_key(coap_session_t *session,
const coap_bin_const_t *psk_key
) {
/* We may be refreshing the key with the same key */
coap_bin_const_t *old_psk_key = session->psk_key;
if (psk_key && psk_key->s) {
if (session->psk_key) {
if (coap_binary_equal(session->psk_key, psk_key))
return 1;
}
session->psk_key = coap_new_bin_const(psk_key->s, psk_key->length);
if (!session->psk_key) {
coap_log(LOG_ERR, "No memory to store pre-shared key (PSK)\n");
if (old_psk_key)
coap_delete_bin_const(old_psk_key);
return 0;
}
}
else {
session->psk_key = NULL;
}
if (old_psk_key)
coap_delete_bin_const(old_psk_key);
return 1;
}
int
coap_session_refresh_psk_identity(coap_session_t *session,
const coap_bin_const_t *psk_identity
) {
/* We may be refreshing the identity with the same identity */
coap_bin_const_t *old_psk_identity = session->psk_identity;
if (psk_identity && psk_identity->s) {
if (session->psk_identity) {
if (coap_binary_equal(session->psk_identity, psk_identity))
return 1;
}
session->psk_identity = coap_new_bin_const(psk_identity->s,
psk_identity->length);
if (!session->psk_identity) {
coap_log(LOG_ERR, "No memory to store pre-shared key identity (PSK)\n");
if (old_psk_identity)
coap_delete_bin_const(old_psk_identity);
return 0;
}
}
else {
session->psk_identity = NULL;
}
if (old_psk_identity)
coap_delete_bin_const(old_psk_identity);
return 1;
}
#if COAP_SERVER_SUPPORT
const coap_bin_const_t *
coap_session_get_psk_hint(const coap_session_t *session) {
if (session)
return session->psk_hint;
return NULL;
}
#endif /* COAP_SERVER_SUPPORT */
const coap_bin_const_t *
coap_session_get_psk_identity(const coap_session_t *session) {
const coap_bin_const_t *psk_identity = NULL;
if (session) {
psk_identity = session->psk_identity;
if (psk_identity == NULL) {
psk_identity = &session->cpsk_setup_data.psk_info.identity;
}
}
return psk_identity;
}
const coap_bin_const_t *
coap_session_get_psk_key(const coap_session_t *session) {
if (session)
return session->psk_key;
return NULL;
}
#if COAP_CLIENT_SUPPORT
coap_session_t *coap_new_client_session_pki(
coap_context_t *ctx,
const coap_address_t *local_if,
const coap_address_t *server,
coap_proto_t proto,
coap_dtls_pki_t* setup_data
) {
coap_session_t *session;
if (coap_dtls_is_supported() || coap_tls_is_supported()) {
if (!setup_data) {
return NULL;
} else {
if (setup_data->version != COAP_DTLS_PKI_SETUP_VERSION) {
coap_log(LOG_ERR,
"coap_new_client_session_pki: Wrong version of setup_data\n");
return NULL;
}
}
}
session = coap_session_create_client(ctx, local_if, server, proto);
if (!session) {
return NULL;
}
if (coap_dtls_is_supported() || coap_tls_is_supported()) {
/* we know that setup_data is not NULL */
if (!coap_dtls_context_set_pki(ctx, setup_data, COAP_DTLS_ROLE_CLIENT)) {
coap_session_release(session);
return NULL;
}
}
coap_log(LOG_DEBUG, "***%s: new outgoing session\n",
coap_session_str(session));
return coap_session_connect(session);
}
#endif /* ! COAP_CLIENT_SUPPORT */
#if COAP_SERVER_SUPPORT
coap_session_t *coap_new_server_session(
coap_context_t *ctx,
coap_endpoint_t *ep
) {
coap_session_t *session;
session = coap_make_session( ep->proto, COAP_SESSION_TYPE_SERVER,
NULL, NULL, NULL, 0, ctx, ep );
if (!session)
goto error;
#if !COAP_DISABLE_TCP
if (!coap_socket_accept_tcp(&ep->sock, &session->sock,
&session->addr_info.local,
&session->addr_info.remote))
goto error;
coap_make_addr_hash(&session->addr_hash, session->proto, &session->addr_info);
#endif /* !COAP_DISABLE_TCP */
session->sock.flags |= COAP_SOCKET_NOT_EMPTY | COAP_SOCKET_CONNECTED
| COAP_SOCKET_WANT_READ;
#ifdef COAP_EPOLL_SUPPORT
session->sock.session = session;
coap_epoll_ctl_add(&session->sock,
EPOLLIN,
__func__);
#endif /* COAP_EPOLL_SUPPORT */
SESSIONS_ADD(ep->sessions, session);
if (session) {
coap_log(LOG_DEBUG, "***%s: session %p: new incoming session\n",
coap_session_str(session), (void *)session);
/* Returned session may already have been released and is now NULL */
session = coap_session_accept(session);
if(session) {
coap_handle_event(session->context, COAP_EVENT_SERVER_SESSION_NEW, session);
}
}
return session;
error:
/*
* Need to add in the session as coap_session_release()
* will call SESSIONS_DELETE in coap_session_free().
*/
if (session) {
SESSIONS_ADD(ep->sessions, session);
coap_session_free(session);
}
return NULL;
}
#endif /* COAP_SERVER_SUPPORT */
void
coap_session_init_token(coap_session_t *session, size_t len,
const uint8_t *data) {
session->tx_token = coap_decode_var_bytes8(data, len);
}
void coap_session_new_token(coap_session_t *session, size_t *len,
uint8_t *data) {
*len = coap_encode_var_safe8(data,
sizeof(session->tx_token), ++session->tx_token);
}
uint16_t
coap_new_message_id(coap_session_t *session) {
return ++session->tx_mid;
}
const coap_address_t *
coap_session_get_addr_remote(const coap_session_t *session) {
if (session)
return &session->addr_info.remote;
return NULL;
}
const coap_address_t *
coap_session_get_addr_local(const coap_session_t *session) {
if (session)
return &session->addr_info.local;
return NULL;
}
coap_context_t *
coap_session_get_context(const coap_session_t *session) {
if (session)
return session->context;
return NULL;
}
coap_proto_t
coap_session_get_proto(const coap_session_t *session) {
if (session)
return session->proto;
return 0;
}
coap_session_type_t
coap_session_get_type(const coap_session_t *session) {
if (session)
return session->type;
return 0;
}
#if COAP_CLIENT_SUPPORT
int
coap_session_set_type_client(coap_session_t *session) {
#if COAP_SERVER_SUPPORT
if (session && session->type == COAP_SESSION_TYPE_SERVER) {
coap_session_reference(session);
session->type = COAP_SESSION_TYPE_CLIENT;
return 1;
}
#else /* ! COAP_SERVER_SUPPORT */
(void)session;
#endif /* ! COAP_SERVER_SUPPORT */
return 0;
}
#endif /* COAP_CLIENT_SUPPORT */
coap_session_state_t
coap_session_get_state(const coap_session_t *session) {
if (session)
return session->state;
return 0;
}
int coap_session_get_ifindex(const coap_session_t *session) {
if (session)
return session->ifindex;
return -1;
}
void *coap_session_get_tls(const coap_session_t *session,
coap_tls_library_t *tls_lib) {
if (session)
return coap_dtls_get_tls(session, tls_lib);
return NULL;
}
#ifndef WITH_LWIP
#if COAP_SERVER_SUPPORT
coap_endpoint_t *
coap_new_endpoint(coap_context_t *context, const coap_address_t *listen_addr, coap_proto_t proto) {
coap_endpoint_t *ep = NULL;
assert(context);
assert(listen_addr);
assert(proto != COAP_PROTO_NONE);
if (proto == COAP_PROTO_DTLS && !coap_dtls_is_supported()) {
coap_log(LOG_CRIT, "coap_new_endpoint: DTLS not supported\n");
goto error;
}
if (proto == COAP_PROTO_TLS && !coap_tls_is_supported()) {
coap_log(LOG_CRIT, "coap_new_endpoint: TLS not supported\n");
goto error;
}
if (proto == COAP_PROTO_TCP && !coap_tcp_is_supported()) {
coap_log(LOG_CRIT, "coap_new_endpoint: TCP not supported\n");
goto error;
}
if (proto == COAP_PROTO_DTLS || proto == COAP_PROTO_TLS) {
if (!coap_dtls_context_check_keys_enabled(context)) {
coap_log(LOG_INFO,
"coap_new_endpoint: one of coap_context_set_psk() or "
"coap_context_set_pki() not called\n");
goto error;
}
}
ep = coap_malloc_endpoint();
if (!ep) {
coap_log(LOG_WARNING, "coap_new_endpoint: malloc");
goto error;
}
memset(ep, 0, sizeof(coap_endpoint_t));
ep->context = context;
ep->proto = proto;
if (proto==COAP_PROTO_UDP || proto==COAP_PROTO_DTLS) {
if (!coap_socket_bind_udp(&ep->sock, listen_addr, &ep->bind_addr))
goto error;
ep->sock.flags |= COAP_SOCKET_WANT_READ;
#if !COAP_DISABLE_TCP
} else if (proto==COAP_PROTO_TCP || proto==COAP_PROTO_TLS) {
if (!coap_socket_bind_tcp(&ep->sock, listen_addr, &ep->bind_addr))
goto error;
ep->sock.flags |= COAP_SOCKET_WANT_ACCEPT;
#endif /* !COAP_DISABLE_TCP */
} else {
coap_log(LOG_CRIT, "coap_new_endpoint: protocol not supported\n");
goto error;
}
if (LOG_DEBUG <= coap_get_log_level()) {
#ifndef INET6_ADDRSTRLEN
#define INET6_ADDRSTRLEN 40
#endif
unsigned char addr_str[INET6_ADDRSTRLEN + 8];
if (coap_print_addr(&ep->bind_addr, addr_str, INET6_ADDRSTRLEN + 8)) {
coap_log(LOG_DEBUG, "created %s endpoint %s\n",
ep->proto == COAP_PROTO_TLS ? "TLS "
: ep->proto == COAP_PROTO_TCP ? "TCP "
: ep->proto == COAP_PROTO_DTLS ? "DTLS" : "UDP ",
addr_str);
}
}
ep->sock.flags |= COAP_SOCKET_NOT_EMPTY | COAP_SOCKET_BOUND;
ep->default_mtu = COAP_DEFAULT_MTU;
#ifdef COAP_EPOLL_SUPPORT
ep->sock.endpoint = ep;
coap_epoll_ctl_add(&ep->sock,
EPOLLIN,
__func__);
#endif /* COAP_EPOLL_SUPPORT */
LL_PREPEND(context->endpoint, ep);
return ep;
error:
coap_free_endpoint(ep);
return NULL;
}
void coap_endpoint_set_default_mtu(coap_endpoint_t *ep, unsigned mtu) {
ep->default_mtu = (uint16_t)mtu;
}
void
coap_free_endpoint(coap_endpoint_t *ep) {
if (ep) {
coap_session_t *session, *rtmp;
SESSIONS_ITER_SAFE(ep->sessions, session, rtmp) {
assert(session->ref == 0);
if (session->ref == 0) {
coap_session_free(session);
}
}
if (ep->sock.flags != COAP_SOCKET_EMPTY) {
/*
* ep->sock.endpoint is set in coap_new_endpoint().
* ep->sock.session is never set.
*
* session->sock.session is set for both clients and servers (when a
* new session is accepted), but does not affect the endpoint.
*
* So, it is safe to call coap_socket_close() after all the sessions
* have been freed above as we are only working with the endpoint sock.
*/
#ifdef COAP_EPOLL_SUPPORT
assert(ep->sock.session == NULL);
#endif /* COAP_EPOLL_SUPPORT */
coap_socket_close(&ep->sock);
}
if (ep->context && ep->context->endpoint) {
LL_DELETE(ep->context->endpoint, ep);
}
coap_mfree_endpoint(ep);
}
}
#endif /* COAP_SERVER_SUPPORT */
#endif /* WITH_LWIP */
coap_session_t *
coap_session_get_by_peer(const coap_context_t *ctx,
const coap_address_t *remote_addr,
int ifindex) {
coap_session_t *s, *rtmp;
#if COAP_CLIENT_SUPPORT
SESSIONS_ITER(ctx->sessions, s, rtmp) {
if (s->ifindex == ifindex && coap_address_equals(&s->addr_info.remote,
remote_addr))
return s;
}
#endif /* COAP_CLIENT_SUPPORT */
#if COAP_SERVER_SUPPORT
coap_endpoint_t *ep;
LL_FOREACH(ctx->endpoint, ep) {
SESSIONS_ITER(ep->sessions, s, rtmp) {
if (s->ifindex == ifindex && coap_address_equals(&s->addr_info.remote,
remote_addr))
return s;
}
}
#endif /* COAP_SERVER_SUPPORT */
return NULL;
}
const char *coap_session_str(const coap_session_t *session) {
static char szSession[2 * (INET6_ADDRSTRLEN + 8) + 24];
char *p = szSession, *end = szSession + sizeof(szSession);
if (coap_print_addr(&session->addr_info.local,
(unsigned char*)p, end - p) > 0)
p += strlen(p);
if (p + 6 < end) {
strcpy(p, " <-> ");
p += 5;
}
if (p + 1 < end) {
if (coap_print_addr(&session->addr_info.remote,
(unsigned char*)p, end - p) > 0)
p += strlen(p);
}
if (session->ifindex > 0 && p + 1 < end)
p += snprintf(p, end - p, " (if%d)", session->ifindex);
if (p + 6 < end) {
if (session->proto == COAP_PROTO_UDP) {
strcpy(p, " UDP ");
p += 4;
} else if (session->proto == COAP_PROTO_DTLS) {
strcpy(p, " DTLS");
p += 5;
} else if (session->proto == COAP_PROTO_TCP) {
strcpy(p, " TCP ");
p += 4;
} else if (session->proto == COAP_PROTO_TLS) {
strcpy(p, " TLS ");
p += 4;
} else {
strcpy(p, " NONE");
p += 5;
}
}
return szSession;
}
#if COAP_SERVER_SUPPORT
const char *coap_endpoint_str(const coap_endpoint_t *endpoint) {
static char szEndpoint[128];
char *p = szEndpoint, *end = szEndpoint + sizeof(szEndpoint);
if (coap_print_addr(&endpoint->bind_addr, (unsigned char*)p, end - p) > 0)
p += strlen(p);
if (p + 6 < end) {
if (endpoint->proto == COAP_PROTO_UDP) {
strcpy(p, " UDP");
p += 4;
} else if (endpoint->proto == COAP_PROTO_DTLS) {
strcpy(p, " DTLS");
p += 5;
} else {
strcpy(p, " NONE");
p += 5;
}
}
return szEndpoint;
}
#endif /* COAP_SERVER_SUPPORT */
#ifdef COAP_CLIENT_SUPPORT
void
coap_session_set_no_observe_cancel(coap_session_t *session) {
session->no_observe_cancel = 1;
}
#endif /* COAP_CLIENT_SUPPORT */
#endif /* COAP_SESSION_C_ */
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