void
mirror_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
/* The ETag and Token is copied to the header. */
uint8_t opaque[] = {0x0A, 0xBC, 0xDE};
/* Strings are not copied, so use static string buffers or strings in .text memory (char *str = "string in .text";). */
static char location[] = {'/','f','/','a','?','k','&','e', 0};
/* Getter for the header option Content-Type. If the option is not set, text/plain is returned by default. */
unsigned int content_type = REST.get_header_content_type(request);
/* The other getters copy the value (or string/array pointer) to the given pointers and return 1 for success or the length of strings/arrays. */
uint32_t max_age_and_size = 0;
const char *str = NULL;
uint32_t observe = 0;
const uint8_t *bytes = NULL;
uint32_t block_num = 0;
uint8_t block_more = 0;
uint16_t block_size = 0;
const char *query = "";
int len = 0;
/* Mirror the received header options in the response payload. Unsupported getters (e.g., rest_get_header_observe() with HTTP) will return 0. */
int strpos = 0;
/* snprintf() counts the terminating '\0' to the size parameter.
* The additional byte is taken care of by allocating REST_MAX_CHUNK_SIZE+1 bytes in the REST framework.
* Add +1 to fill the complete buffer, as the payload does not need a terminating '\0'. */
if (content_type!=-1)
{
strpos += snprintf((char *)buffer, REST_MAX_CHUNK_SIZE+1, "CT %u\n", content_type);
}
/* Some getters such as for ETag or Location are omitted, as these options should not appear in a request.
* Max-Age might appear in HTTP requests or used for special purposes in CoAP. */
if (strpos<=REST_MAX_CHUNK_SIZE && REST.get_header_max_age(request, &max_age_and_size))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "MA %lu\n", max_age_and_size);
}
/* For HTTP this is the Length option, for CoAP it is the Size option. */
if (strpos<=REST_MAX_CHUNK_SIZE && REST.get_header_length(request, &max_age_and_size))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "SZ %lu\n", max_age_and_size);
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_header_host(request, &str)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "UH %.*s\n", len, str);
}
/* CoAP-specific example: actions not required for normal RESTful Web service. */
#if WITH_COAP > 1
if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_observe(request, &observe))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Ob %lu\n", observe);
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_token(request, &bytes)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "To 0x");
int index = 0;
for (index = 0; index<len; ++index) {
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%02X", bytes[index]);
}
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "\n");
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_etag(request, &bytes)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "ET 0x");
int index = 0;
for (index = 0; index<len; ++index) {
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%02X", bytes[index]);
}
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "\n");
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_uri_path(request, &str)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "UP ");
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%.*s\n", len, str);
}
#if WITH_COAP == 3
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location(request, &str)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Lo %.*s\n", len, str);
}
if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_block(request, &block_num, &block_more, &block_size, NULL)) /* This getter allows NULL pointers to get only a subset of the block parameters. */
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Bl %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size);
}
#else
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location_path(request, &str)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "LP %.*s\n", len, str);
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = coap_get_header_location_query(request, &str)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "LQ %.*s\n", len, str);
}
if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_block2(request, &block_num, &block_more, &block_size, NULL)) /* This getter allows NULL pointers to get only a subset of the block parameters. */
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "B2 %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size);
}
/*
* Critical Block1 option is currently rejected by engine.
*
if (strpos<=REST_MAX_CHUNK_SIZE && coap_get_header_block1(request, &block_num, &block_more, &block_size, NULL))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "B1 %lu%s (%u)\n", block_num, block_more ? "+" : "", block_size);
}
*/
#endif /* CoAP > 03 */
#endif /* CoAP-specific example */
if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_query(request, &query)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "Qu %.*s\n", len, query);
}
if (strpos<=REST_MAX_CHUNK_SIZE && (len = REST.get_request_payload(request, &bytes)))
{
strpos += snprintf((char *)buffer+strpos, REST_MAX_CHUNK_SIZE-strpos+1, "%.*s", len, bytes);
}
if (strpos >= REST_MAX_CHUNK_SIZE)
{
buffer[REST_MAX_CHUNK_SIZE-1] = 0xBB; /* '»' to indicate truncation */
}
REST.set_response_payload(response, buffer, strpos);
PRINTF("/mirror options received: %s\n", buffer);
/* Set dummy header options for response. Like getters, some setters are not implemented for HTTP and have no effect. */
REST.set_header_content_type(response, REST.type.TEXT_PLAIN);
REST.set_header_max_age(response, 17); /* For HTTP, browsers will not re-request the page for 17 seconds. */
REST.set_header_etag(response, opaque, 2);
REST.set_header_location(response, location); /* Initial slash is omitted by framework */
REST.set_header_length(response, strpos); /* For HTTP, browsers will not re-request the page for 10 seconds. CoAP action depends on the client. */
/* CoAP-specific example: actions not required for normal RESTful Web service. */
#if WITH_COAP > 1
coap_set_header_uri_host(response, "tiki");
coap_set_header_observe(response, 10);
#if WITH_COAP == 3
coap_set_header_block(response, 42, 0, 64); /* The block option might be overwritten by the framework when blockwise transfer is requested. */
#else
coap_set_header_proxy_uri(response, "ftp://x");
coap_set_header_block2(response, 42, 0, 64); /* The block option might be overwritten by the framework when blockwise transfer is requested. */
coap_set_header_block1(response, 23, 0, 16);
coap_set_header_accept(response, TEXT_PLAIN);
coap_set_header_if_none_match(response);
#endif /* CoAP > 03 */
#endif /* CoAP-specific example */
}
/*-----------------------------------------------------------------------------------*/
static
int
handle_incoming_data(void)
{
int error = NO_ERROR;
PRINTF("handle_incoming_data(): received uip_datalen=%u \n",(uint16_t)uip_datalen());
if (uip_newdata()) {
PRINTF("receiving UDP datagram from: ");
PRINT6ADDR(&UIP_IP_BUF->srcipaddr);
PRINTF(":%u\n Length: %u\n Data: ", uip_ntohs(UIP_UDP_BUF->srcport), uip_datalen() );
PRINTBITS(uip_appdata, uip_datalen());
PRINTF("\n");
coap_packet_t message[1];
coap_transaction_t *transaction = NULL;
error = coap_parse_message(message, uip_appdata, uip_datalen());
if (error==NO_ERROR)
{
/*TODO duplicates suppression, if required */
PRINTF(" Parsed: v %u, t %u, oc %u, c %u, tid %u\n", message->version, message->type, message->option_count, message->code, message->tid);
PRINTF(" URL: %.*s\n", message->uri_path_len, message->uri_path);
PRINTF(" Payload: %.*s\n", message->payload_len, message->payload);
/* Handle requests. */
if (message->code >= COAP_GET && message->code <= COAP_DELETE)
{
/* Use transaction buffer for response to confirmable request. */
if ( (transaction = coap_new_transaction(message->tid, &UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport)) )
{
uint32_t block_num = 0;
uint16_t block_size = REST_MAX_CHUNK_SIZE;
uint32_t block_offset = 0;
int32_t new_offset = 0;
/* prepare response */
coap_packet_t response[1]; /* This way the packet can be treated as pointer as usual. */
if (message->type==COAP_TYPE_CON)
{
/* Reliable CON requests are answered with an ACK. */
coap_init_message(response, COAP_TYPE_ACK, OK_200, message->tid);
}
else
{
/* Unreliable NON requests are answered with a NON as well. */
coap_init_message(response, COAP_TYPE_NON, OK_200, coap_get_tid());
}
/* resource handlers must take care of different handling (e.g., TOKEN_OPTION_REQUIRED_240) */
if (IS_OPTION(message, COAP_OPTION_TOKEN))
{
coap_set_header_token(response, message->token, message->token_len);
SET_OPTION(response, COAP_OPTION_TOKEN);
}
/* get offset for blockwise transfers */
if (coap_get_header_block(message, &block_num, NULL, &block_size, &block_offset))
{
PRINTF("Blockwise: block request %lu (%u/%u) @ %lu bytes\n", block_num, block_size, REST_MAX_CHUNK_SIZE, block_offset);
block_size = MIN(block_size, REST_MAX_CHUNK_SIZE);
new_offset = block_offset;
}
/*------------------------------------------*/
/* call application-specific handler */
/*------------------------------------------*/
if (service_cbk) {
service_cbk(message, response, transaction->packet+COAP_MAX_HEADER_SIZE, block_size, &new_offset);
}
/*------------------------------------------*/
/* apply blockwise transfers */
if ( IS_OPTION(message, COAP_OPTION_BLOCK) )
{
/* unchanged new_offset indicates that resource is unaware of blockwise transfer */
if (new_offset==block_offset)
{
PRINTF("Blockwise: unaware resource with payload length %u/%u\n", response->payload_len, block_size);
if (block_offset >= response->payload_len)
{
response->code = BAD_REQUEST_400;
coap_set_payload(response, (uint8_t*)"Block out of scope", 18);
}
else
{
coap_set_header_block(response, block_num, response->payload_len - block_offset > block_size, block_size);
coap_set_payload(response, response->payload+block_offset, MIN(response->payload_len - block_offset, block_size));
} /* if (valid offset) */
}
else
{
/* resource provides chunk-wise data */
PRINTF("Blockwise: blockwise resource, new offset %ld\n", new_offset);
coap_set_header_block(response, block_num, new_offset!=-1 || response->payload_len > block_size, block_size);
if (response->payload_len > block_size) coap_set_payload(response, response->payload, block_size);
} /* if (resource aware of blockwise) */
}
else if (new_offset!=0)
{
PRINTF("Blockwise: no block option for blockwise resource, using block size %u\n", REST_MAX_CHUNK_SIZE);
coap_set_header_block(response, 0, new_offset!=-1, REST_MAX_CHUNK_SIZE);
coap_set_payload(response, response->payload, MIN(response->payload_len, REST_MAX_CHUNK_SIZE));
} /* if (blockwise request) */
if ((transaction->packet_len = coap_serialize_message(response, transaction->packet))==0)
{
error = PACKET_SERIALIZATION_ERROR;
}
} else {
error = MEMORY_ALLOCATION_ERROR;
}
}
else
{
/* Responses */
coap_transaction_t *t;
if (message->type==COAP_TYPE_ACK)
{
PRINTF("Received ACK\n");
}
else if (message->type==COAP_TYPE_RST)
{
PRINTF("Received RST\n");
/* Cancel possible subscriptions. */
if (IS_OPTION(message, COAP_OPTION_TOKEN))
{
PRINTF(" Token 0x%02X%02X\n", message->token[0], message->token[1]);
coap_remove_observer_by_token(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport, message->token, message->token_len);
}
}
if ( (t = coap_get_transaction_by_tid(message->tid)) )
{
/* Free transaction memory before callback, as it may create a new transaction. */
restful_response_handler callback = t->callback;
void *callback_data = t->callback_data;
coap_clear_transaction(t);
/* Check if someone registered for the response */
if (callback) {
callback(callback_data, message);
}
} /* if (transaction) */
}
} /* if (parsed correctly) */
if (error==NO_ERROR) {
if (transaction) coap_send_transaction(transaction);
}
else
{
PRINTF("ERROR %u: %s\n", error, error_messages[error]);
/* reuse input buffer */
coap_init_message(message, COAP_TYPE_ACK, INTERNAL_SERVER_ERROR_500, message->tid);
coap_set_payload(message, (uint8_t *) error_messages[error], strlen(error_messages[error]));
coap_send_message(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport, uip_appdata, coap_serialize_message(message, uip_appdata));
}
} /* if (new data) */
return error;
}
