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6 * notice, this list of conditions and the following disclaimer.
7 * 2. Redistributions in binary form must reproduce the above copyright
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10 * 3. Neither the name of the Institute nor the names of its contributors
11 * may be used to endorse or promote products derived from this software
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14 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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26 * This file is part of the Contiki operating system.
31 #include "contiki-lib.h"
32 #include "contiki-net.h"
34 #include "dev/serial-line.h"
41 #define DEBUG DEBUG_PRINT
43 #include "net/ip/uip-debug.h"
49 /* The PSK information for DTLS */
50 /* make sure that default identity and key fit into buffer, i.e.
51 * sizeof(PSK_DEFAULT_IDENTITY) - 1 <= PSK_ID_MAXLEN and
52 * sizeof(PSK_DEFAULT_KEY) - 1 <= PSK_MAXLEN
55 #define PSK_ID_MAXLEN 32
57 #define PSK_DEFAULT_IDENTITY "Client_identity"
58 #define PSK_DEFAULT_KEY "secretPSK"
61 #define UIP_IP_BUF ((struct uip_ip_hdr *)&uip_buf[UIP_LLH_LEN])
62 #define UIP_UDP_BUF ((struct uip_udp_hdr *)&uip_buf[UIP_LLIPH_LEN])
64 #define MAX_PAYLOAD_LEN 120
66 static struct uip_udp_conn *client_conn;
67 static dtls_context_t *dtls_context;
69 static size_t buflen = 0;
71 static const unsigned char ecdsa_priv_key[] = {
72 0x41, 0xC1, 0xCB, 0x6B, 0x51, 0x24, 0x7A, 0x14,
73 0x43, 0x21, 0x43, 0x5B, 0x7A, 0x80, 0xE7, 0x14,
74 0x89, 0x6A, 0x33, 0xBB, 0xAD, 0x72, 0x94, 0xCA,
75 0x40, 0x14, 0x55, 0xA1, 0x94, 0xA9, 0x49, 0xFA};
77 static const unsigned char ecdsa_pub_key_x[] = {
78 0x36, 0xDF, 0xE2, 0xC6, 0xF9, 0xF2, 0xED, 0x29,
79 0xDA, 0x0A, 0x9A, 0x8F, 0x62, 0x68, 0x4E, 0x91,
80 0x63, 0x75, 0xBA, 0x10, 0x30, 0x0C, 0x28, 0xC5,
81 0xE4, 0x7C, 0xFB, 0xF2, 0x5F, 0xA5, 0x8F, 0x52};
83 static const unsigned char ecdsa_pub_key_y[] = {
84 0x71, 0xA0, 0xD4, 0xFC, 0xDE, 0x1A, 0xB8, 0x78,
85 0x5A, 0x3C, 0x78, 0x69, 0x35, 0xA7, 0xCF, 0xAB,
86 0xE9, 0x3F, 0x98, 0x72, 0x09, 0xDA, 0xED, 0x0B,
87 0x4F, 0xAB, 0xC3, 0x6F, 0xC7, 0x72, 0xF8, 0x29};
90 try_send(struct dtls_context_t *ctx, session_t *dst) {
92 res = dtls_write(ctx, dst, (uint8 *)buf, buflen);
94 memmove(buf, buf + res, buflen - res);
100 read_from_peer(struct dtls_context_t *ctx,
101 session_t *session, uint8 *data, size_t len) {
103 for (i = 0; i < len; i++)
104 PRINTF("%c", data[i]);
109 send_to_peer(struct dtls_context_t *ctx,
110 session_t *session, uint8 *data, size_t len) {
112 struct uip_udp_conn *conn = (struct uip_udp_conn *)dtls_get_app_data(ctx);
114 uip_ipaddr_copy(&conn->ripaddr, &session->addr);
115 conn->rport = session->port;
118 PRINT6ADDR(&conn->ripaddr);
119 PRINTF(":%u\n", uip_ntohs(conn->rport));
121 uip_udp_packet_send(conn, data, len);
123 /* Restore server connection to allow data from any node */
124 /* FIXME: do we want this at all? */
125 memset(&conn->ripaddr, 0, sizeof(conn->ripaddr));
126 memset(&conn->rport, 0, sizeof(conn->rport));
132 static unsigned char psk_id[PSK_ID_MAXLEN] = PSK_DEFAULT_IDENTITY;
133 static size_t psk_id_length = sizeof(PSK_DEFAULT_IDENTITY) - 1;
134 static unsigned char psk_key[PSK_MAXLEN] = PSK_DEFAULT_KEY;
135 static size_t psk_key_length = sizeof(PSK_DEFAULT_KEY) - 1;
138 #define UNUSED_PARAM __attribute__((unused))
141 #endif /* __GNUC__ */
143 /* This function is the "key store" for tinyDTLS. It is called to
144 * retrieve a key for the given identity within this particular
147 get_psk_info(struct dtls_context_t *ctx UNUSED_PARAM,
148 const session_t *session UNUSED_PARAM,
149 dtls_credentials_type_t type,
150 const unsigned char *id, size_t id_len,
151 unsigned char *result, size_t result_length) {
154 case DTLS_PSK_IDENTITY:
155 if (result_length < psk_id_length) {
156 dtls_warn("cannot set psk_identity -- buffer too small\n");
157 return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
160 memcpy(result, psk_id, psk_id_length);
161 return psk_id_length;
163 if (id_len != psk_id_length || memcmp(psk_id, id, id_len) != 0) {
164 dtls_warn("PSK for unknown id requested, exiting\n");
165 return dtls_alert_fatal_create(DTLS_ALERT_ILLEGAL_PARAMETER);
166 } else if (result_length < psk_key_length) {
167 dtls_warn("cannot set psk -- buffer too small\n");
168 return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
171 memcpy(result, psk_key, psk_key_length);
172 return psk_key_length;
174 dtls_warn("unsupported request type: %d\n", type);
177 return dtls_alert_fatal_create(DTLS_ALERT_INTERNAL_ERROR);
179 #endif /* DTLS_PSK */
183 get_ecdsa_key(struct dtls_context_t *ctx,
184 const session_t *session,
185 const dtls_ecdsa_key_t **result) {
186 static const dtls_ecdsa_key_t ecdsa_key = {
187 .curve = DTLS_ECDH_CURVE_SECP256R1,
188 .priv_key = ecdsa_priv_key,
189 .pub_key_x = ecdsa_pub_key_x,
190 .pub_key_y = ecdsa_pub_key_y
193 *result = &ecdsa_key;
198 verify_ecdsa_key(struct dtls_context_t *ctx,
199 const session_t *session,
200 const unsigned char *other_pub_x,
201 const unsigned char *other_pub_y,
205 #endif /* DTLS_ECC */
207 PROCESS(udp_server_process, "UDP server process");
208 AUTOSTART_PROCESSES(&udp_server_process);
209 /*---------------------------------------------------------------------------*/
211 dtls_handle_read(dtls_context_t *ctx) {
212 static session_t session;
215 uip_ipaddr_copy(&session.addr, &UIP_IP_BUF->srcipaddr);
216 session.port = UIP_UDP_BUF->srcport;
217 session.size = sizeof(session.addr) + sizeof(session.port);
219 ((char *)uip_appdata)[uip_datalen()] = 0;
220 PRINTF("Client received message from ");
221 PRINT6ADDR(&session.addr);
222 PRINTF(":%d\n", uip_ntohs(session.port));
224 dtls_handle_message(ctx, &session, uip_appdata, uip_datalen());
227 /*---------------------------------------------------------------------------*/
229 print_local_addresses(void)
234 PRINTF("Client IPv6 addresses: ");
235 for(i = 0; i < UIP_DS6_ADDR_NB; i++) {
236 state = uip_ds6_if.addr_list[i].state;
237 if(uip_ds6_if.addr_list[i].isused &&
238 (state == ADDR_TENTATIVE || state == ADDR_PREFERRED)) {
239 PRINT6ADDR(&uip_ds6_if.addr_list[i].ipaddr);
246 set_connection_address(uip_ipaddr_t *ipaddr)
248 #define _QUOTEME(x) #x
249 #define QUOTEME(x) _QUOTEME(x)
250 #ifdef UDP_CONNECTION_ADDR
251 if(uiplib_ipaddrconv(QUOTEME(UDP_CONNECTION_ADDR), ipaddr) == 0) {
252 PRINTF("UDP client failed to parse address '%s'\n", QUOTEME(UDP_CONNECTION_ADDR));
254 #elif UIP_CONF_ROUTER
255 uip_ip6addr(ipaddr,0xaaaa,0,0,0,0x0200,0x0000,0x0000,0x0001);
257 uip_ip6addr(ipaddr,0xfe80,0,0,0,0x6466,0x6666,0x6666,0x6666);
258 #endif /* UDP_CONNECTION_ADDR */
262 init_dtls(session_t *dst) {
263 static dtls_handler_t cb = {
264 .write = send_to_peer,
265 .read = read_from_peer,
268 .get_psk_info = get_psk_info,
269 #endif /* DTLS_PSK */
271 .get_ecdsa_key = get_ecdsa_key,
272 .verify_ecdsa_key = verify_ecdsa_key
273 #endif /* DTLS_ECC */
275 PRINTF("DTLS client started\n");
277 print_local_addresses();
279 dst->size = sizeof(dst->addr) + sizeof(dst->port);
280 dst->port = UIP_HTONS(20220);
282 set_connection_address(&dst->addr);
283 client_conn = udp_new(&dst->addr, 0, NULL);
284 udp_bind(client_conn, dst->port);
286 PRINTF("set connection address to ");
287 PRINT6ADDR(&dst->addr);
288 PRINTF(":%d\n", uip_ntohs(dst->port));
290 dtls_set_log_level(DTLS_LOG_DEBUG);
292 dtls_context = dtls_new_context(client_conn);
294 dtls_set_handler(dtls_context, &cb);
297 /*---------------------------------------------------------------------------*/
298 PROCESS_THREAD(udp_server_process, ev, data)
300 static int connected = 0;
301 static session_t dst;
311 dtls_emerg("cannot create context\n");
317 if(ev == tcpip_event) {
318 dtls_handle_read(dtls_context);
319 } else if (ev == serial_line_event_message) {
320 register size_t len = min(strlen(data), sizeof(buf) - buflen);
321 memcpy(buf + buflen, data, len);
323 if (buflen < sizeof(buf) - 1)
324 buf[buflen++] = '\n'; /* serial event does not contain LF */
329 connected = dtls_connect(dtls_context, &dst) >= 0;
331 try_send(dtls_context, &dst);
337 /*---------------------------------------------------------------------------*/