/*---------------------------------------------------------------------------*/
static void
dtls_handle_read(dtls_context_t *ctx) {
session_t session;
if(uip_newdata()) {
dtls_session_init(&session);
uip_ipaddr_copy(&session.addr, &UIP_IP_BUF->srcipaddr);
session.port = UIP_UDP_BUF->srcport;
dtls_handle_message(ctx, &session, uip_appdata, uip_datalen());
}
}
static int
get_key(struct dtls_context_t *ctx,
const session_t *session,
const unsigned char *id, size_t id_len,
const dtls_key_t **result) {
static const dtls_key_t psk = {
.type = DTLS_KEY_PSK,
.key.psk.id = (unsigned char *)DTLS_IDENTITY_HINT,
.key.psk.id_length = DTLS_IDENTITY_HINT_LENGTH,
.key.psk.key = (unsigned char *)DTLS_PSK_KEY,
.key.psk.key_length = DTLS_PSK_KEY_LENGTH
};
*result = &psk;
return 0;
}
#else
static int
get_psk_key(struct dtls_context_t *ctx,
const session_t *session,
const unsigned char *id, size_t id_len,
const dtls_psk_key_t **result) {
static const dtls_psk_key_t psk = {
.id = (unsigned char *)DTLS_IDENTITY_HINT,
.id_length = DTLS_IDENTITY_HINT_LENGTH,
.key = (unsigned char *)DTLS_PSK_KEY,
.key_length = DTLS_PSK_KEY_LENGTH
};
*result = &psk;
return 0;
}
#endif
/*-----------------------------------------------------------------------------------*/
void
coap_init_communication_layer(uint16_t port)
{
static dtls_handler_t cb = {
.write = send_to_peer,
.read = read_from_peer,
.event = NULL,
#if DTLS_VERSION_0_4_0
.get_key = get_key
#else
.get_psk_key = get_psk_key,
.get_ecdsa_key = NULL,
.verify_ecdsa_key = NULL
#endif
};
server_conn = udp_new(NULL, 0, NULL);
udp_bind(server_conn, port);
dtls_set_log_level(LOG_DEBUG);
dtls_context = dtls_new_context(server_conn);
if (dtls_context)
dtls_set_handler(dtls_context, &cb);
/* new connection with remote host */
printf("COAP-DTLS listening on port %u\n", uip_ntohs(server_conn->lport));
}
/*-----------------------------------------------------------------------------------*/
static int
send_to_peer(struct dtls_context_t *ctx,
session_t *session, uint8 *data, size_t len) {
struct uip_udp_conn *conn = (struct uip_udp_conn *)dtls_get_app_data(ctx);
uip_ipaddr_copy(&conn->ripaddr, &session->addr);
conn->rport = session->port;
uip_udp_packet_send(conn, data, len);
/* Restore server connection to allow data from any node */
memset(&conn->ripaddr, 0, sizeof(conn->ripaddr));
memset(&conn->rport, 0, sizeof(conn->rport));
return len;
}
/*-----------------------------------------------------------------------------------*/
void
coap_send_message(context_t * ctx, uip_ipaddr_t *addr, uint16_t port, uint8_t *data, uint16_t length)
{
session_t session;
dtls_session_init(&session);
uip_ipaddr_copy(&session.addr, addr);
session.port = port;
dtls_write(ctx, &session, data, length);
}
/*-----------------------------------------------------------------------------------*/
static int
read_from_peer(struct dtls_context_t *ctx,
session_t *session, uint8 *data, size_t len) {
uip_len = len;
memmove(uip_appdata, data, len);
coap_receive(ctx);
return 0;
}
/*-----------------------------------------------------------------------------------*/
void
coap_handle_receive()
{
session_t session;
if(uip_newdata()) {
dtls_session_init(&session);
uip_ipaddr_copy(&session.addr, &UIP_IP_BUF->srcipaddr);
session.port = UIP_UDP_BUF->srcport;
dtls_handle_message(dtls_context, &session, uip_appdata, uip_datalen());
}
}
