351 lines
9.8 KiB
C
351 lines
9.8 KiB
C
/*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* This file is part of the Contiki operating system.
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*
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*/
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#include "contiki.h"
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#include "contiki-lib.h"
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#include "contiki-net.h"
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#if UIP_CONF_IPV6_RPL
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#include "net/rpl/rpl.h"
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#endif /* UIP_CONF_IPV6_RPL */
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#include <string.h>
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#include "tinydtls.h"
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#ifndef DEBUG
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#define DEBUG DEBUG_PRINT
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#endif
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#include "net/ip/uip-debug.h"
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#include "debug.h"
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#include "dtls.h"
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#ifdef ENABLE_POWERTRACE
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#include "powertrace.h"
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#endif
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#define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
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#define UIP_UDP_BUF ((struct uip_udp_hdr *)&uip_buf[UIP_LLIPH_LEN])
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#define MAX_PAYLOAD_LEN 120
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static struct uip_udp_conn *server_conn;
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static dtls_context_t *dtls_context;
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static const unsigned char ecdsa_priv_key[] = {
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0xD9, 0xE2, 0x70, 0x7A, 0x72, 0xDA, 0x6A, 0x05,
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0x04, 0x99, 0x5C, 0x86, 0xED, 0xDB, 0xE3, 0xEF,
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0xC7, 0xF1, 0xCD, 0x74, 0x83, 0x8F, 0x75, 0x70,
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0xC8, 0x07, 0x2D, 0x0A, 0x76, 0x26, 0x1B, 0xD4
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};
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static const unsigned char ecdsa_pub_key_x[] = {
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0xD0, 0x55, 0xEE, 0x14, 0x08, 0x4D, 0x6E, 0x06,
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0x15, 0x59, 0x9D, 0xB5, 0x83, 0x91, 0x3E, 0x4A,
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0x3E, 0x45, 0x26, 0xA2, 0x70, 0x4D, 0x61, 0xF2,
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0x7A, 0x4C, 0xCF, 0xBA, 0x97, 0x58, 0xEF, 0x9A
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};
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static const unsigned char ecdsa_pub_key_y[] = {
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0xB4, 0x18, 0xB6, 0x4A, 0xFE, 0x80, 0x30, 0xDA,
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0x1D, 0xDC, 0xF4, 0xF4, 0x2E, 0x2F, 0x26, 0x31,
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0xD0, 0x43, 0xB1, 0xFB, 0x03, 0xE2, 0x2F, 0x4D,
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0x17, 0xDE, 0x43, 0xF9, 0xF9, 0xAD, 0xEE, 0x70
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};
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static int
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read_from_peer(struct dtls_context_t *ctx,
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session_t *session, uint8 *data, size_t len)
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{
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size_t i;
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for (i = 0; i < len; i++) {
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PRINTF("%c", data[i]);
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}
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/* echo incoming application data */
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dtls_write(ctx, session, data, len);
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return 0;
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}
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static int
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send_to_peer(struct dtls_context_t *ctx,
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session_t *session, uint8 *data, size_t len)
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{
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struct uip_udp_conn *conn = (struct uip_udp_conn *)dtls_get_app_data(ctx);
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uip_ipaddr_copy(&conn->ripaddr, &session->addr);
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conn->rport = session->port;
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PRINTF("send to ");
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PRINT6ADDR(&conn->ripaddr);
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PRINTF(":%u\n", uip_ntohs(conn->rport));
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uip_udp_packet_send(conn, data, len);
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/* Restore server connection to allow data from any node */
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memset(&conn->ripaddr, 0, sizeof(conn->ripaddr));
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memset(&conn->rport, 0, sizeof(conn->rport));
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return len;
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}
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#ifdef DTLS_PSK
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/* This function is the "key store" for tinyDTLS. It is called to
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* retrieve a key for the given identity within this particular
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* session. */
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static int
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get_psk_info(struct dtls_context_t *ctx, const session_t *session,
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dtls_credentials_type_t type,
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const unsigned char *id, size_t id_len,
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unsigned char *result, size_t result_length)
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{
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struct keymap_t {
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unsigned char *id;
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size_t id_length;
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unsigned char *key;
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size_t key_length;
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} psk[3] = {
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{
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(unsigned char *)"Client_identity", 15,
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(unsigned char *)"secretPSK", 9
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},
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{
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(unsigned char *)"default identity", 16,
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(unsigned char *)"\x11\x22\x33", 3
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},
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{
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(unsigned char *)"\0", 2,
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(unsigned char *)"", 1
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}
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};
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if (type != DTLS_PSK_KEY) {
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return 0;
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}
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if (id) {
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int i;
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for (i = 0; i < sizeof(psk) / sizeof(struct keymap_t); i++) {
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if (id_len == psk[i].id_length && memcmp(id, psk[i].id, id_len) == 0) {
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if (result_length < psk[i].key_length) {
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dtls_warn("buffer too small for PSK");
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return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
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}
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memcpy(result, psk[i].key, psk[i].key_length);
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return psk[i].key_length;
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}
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}
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}
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return dtls_alert_fatal_create(DTLS_ALERT_DECRYPT_ERROR);
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}
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#endif /* DTLS_PSK */
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#ifdef DTLS_ECC
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static int
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get_ecdsa_key(struct dtls_context_t *ctx,
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const session_t *session,
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const dtls_ecdsa_key_t **result)
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{
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static const dtls_ecdsa_key_t ecdsa_key = {
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.curve = DTLS_ECDH_CURVE_SECP256R1,
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.priv_key = ecdsa_priv_key,
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.pub_key_x = ecdsa_pub_key_x,
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.pub_key_y = ecdsa_pub_key_y
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};
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*result = &ecdsa_key;
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return 0;
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}
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static int
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verify_ecdsa_key(struct dtls_context_t *ctx,
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const session_t *session,
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const unsigned char *other_pub_x,
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const unsigned char *other_pub_y,
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size_t key_size)
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{
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return 0;
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}
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#endif /* DTLS_ECC */
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PROCESS(udp_server_process, "UDP server process");
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AUTOSTART_PROCESSES(&udp_server_process);
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/*---------------------------------------------------------------------------*/
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static void
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dtls_handle_read(dtls_context_t *ctx)
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{
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session_t session;
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if (uip_newdata()) {
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uip_ipaddr_copy(&session.addr, &UIP_IP_BUF->srcipaddr);
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session.port = UIP_UDP_BUF->srcport;
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session.size = sizeof(session.addr) + sizeof(session.port);
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dtls_handle_message(ctx, &session, uip_appdata, uip_datalen());
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}
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}
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/*---------------------------------------------------------------------------*/
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static void
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print_local_addresses(void)
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{
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int i;
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uint8_t state;
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PRINTF("Server IPv6 addresses: \n");
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for (i = 0; i < UIP_DS6_ADDR_NB; i++) {
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state = uip_ds6_if.addr_list[i].state;
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if (uip_ds6_if.addr_list[i].isused &&
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(state == ADDR_TENTATIVE || state == ADDR_PREFERRED)) {
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PRINT6ADDR(&uip_ds6_if.addr_list[i].ipaddr);
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PRINTF("\n");
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}
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}
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}
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#if 0
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static void
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create_rpl_dag(uip_ipaddr_t *ipaddr)
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{
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struct uip_ds6_addr *root_if;
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root_if = uip_ds6_addr_lookup(ipaddr);
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if (root_if != NULL) {
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rpl_dag_t *dag;
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uip_ipaddr_t prefix;
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rpl_set_root(RPL_DEFAULT_INSTANCE, ipaddr);
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dag = rpl_get_any_dag();
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uip_ip6addr(&prefix, 0xaaaa, 0, 0, 0, 0, 0, 0, 0);
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rpl_set_prefix(dag, &prefix, 64);
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PRINTF("created a new RPL dag\n");
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} else {
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PRINTF("failed to create a new RPL DAG\n");
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}
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}
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#endif
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void
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init_dtls()
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{
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static dtls_handler_t cb = {
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.write = send_to_peer,
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.read = read_from_peer,
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.event = NULL,
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#ifdef DTLS_PSK
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.get_psk_info = get_psk_info,
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#endif /* DTLS_PSK */
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#ifdef DTLS_ECC
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.get_ecdsa_key = get_ecdsa_key,
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.verify_ecdsa_key = verify_ecdsa_key
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#endif /* DTLS_ECC */
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};
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#if 0
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uip_ipaddr_t ipaddr;
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/* struct uip_ds6_addr *root_if; */
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#endif /* UIP_CONF_ROUTER */
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PRINTF("DTLS server started\n");
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#if 0 /* TEST */
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memset(&tmp_addr, 0, sizeof(rimeaddr_t));
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if (get_eui64_from_eeprom(tmp_addr.u8));
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#if UIP_CONF_IPV6
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memcpy(&uip_lladdr.addr, &tmp_addr.u8, 8);
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#endif
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#endif /* TEST */
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#if 0
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/* uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0, 0, 0, 0); */
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/* uip_ds6_set_addr_iid(&ipaddr, &uip_lladdr); */
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/* uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF); */
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/* create_rpl_dag(&ipaddr); */
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/* #else */
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/* uip_ds6_addr_add(&ipaddr, 0, ADDR_AUTOCONF); */
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uip_ip6addr(&ipaddr, 0xaaaa, 0, 0, 0, 0x0200, 0, 0, 0x0003);
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uip_ds6_addr_add(&ipaddr, 0, ADDR_MANUAL);
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create_rpl_dag(&ipaddr);
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#endif /* UIP_CONF_ROUTER */
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server_conn = udp_new(NULL, 0, NULL);
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udp_bind(server_conn, UIP_HTONS(20220));
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dtls_set_log_level(DTLS_LOG_DEBUG);
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dtls_context = dtls_new_context(server_conn);
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if (dtls_context) {
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dtls_set_handler(dtls_context, &cb);
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}
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}
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/*---------------------------------------------------------------------------*/
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PROCESS_THREAD(udp_server_process, ev, data)
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{
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PROCESS_BEGIN();
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dtls_init();
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init_dtls();
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print_local_addresses();
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if (!dtls_context) {
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dtls_emerg("cannot create context\n");
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PROCESS_EXIT();
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}
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#ifdef ENABLE_POWERTRACE
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powertrace_start(CLOCK_SECOND * 2);
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#endif
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while (1) {
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PROCESS_WAIT_EVENT();
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if (ev == tcpip_event) {
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dtls_handle_read(dtls_context);
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}
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#if 0
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if (bytes_read > 0) {
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/* dtls_handle_message(dtls_context, &the_session, readbuf, bytes_read); */
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read_from_peer(dtls_context, &the_session, readbuf, bytes_read);
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}
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dtls_handle_message(ctx, &session, uip_appdata, bytes_read);
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#endif
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}
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PROCESS_END();
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}
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/*---------------------------------------------------------------------------*/
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