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contiki/apps/er-coap-03/er-coap-03-engine.c
Matthias Kovatsch f71b0bc794 Added Erbium REST engine with new CoAP implementation
2011-09-14 16:33:01 +02:00

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/*
* Copyright (c) 2011, Institute for Pervasive Computing, ETH Zurich
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* This file is part of the Contiki operating system.
*/
/**
* \file
* CoAP implementation of the REST Engine
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "contiki.h"
#include "contiki-net.h"
#include "er-coap-03-engine.h"
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#define PRINT6ADDR(addr) PRINTF("[%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x]", ((u8_t *)addr)[0], ((u8_t *)addr)[1], ((u8_t *)addr)[2], ((u8_t *)addr)[3], ((u8_t *)addr)[4], ((u8_t *)addr)[5], ((u8_t *)addr)[6], ((u8_t *)addr)[7], ((u8_t *)addr)[8], ((u8_t *)addr)[9], ((u8_t *)addr)[10], ((u8_t *)addr)[11], ((u8_t *)addr)[12], ((u8_t *)addr)[13], ((u8_t *)addr)[14], ((u8_t *)addr)[15])
#define PRINTLLADDR(lladdr) PRINTF(" %02x:%02x:%02x:%02x:%02x:%02x ",(lladdr)->addr[0], (lladdr)->addr[1], (lladdr)->addr[2], (lladdr)->addr[3],(lladdr)->addr[4], (lladdr)->addr[5])
#define PRINTBITS(buf,len) { \
int i,j=0; \
for (i=0; i<len; ++i) { \
for (j=7; j>=0; --j) { \
PRINTF("%c", (((char *)buf)[i] & 1<<j) ? '1' : '0'); \
} \
PRINTF(" "); \
} \
}
#else
#define PRINTF(...)
#define PRINT6ADDR(addr)
#define PRINTLLADDR(addr)
#define PRINTBITS(buf,len)
#endif
PROCESS(coap_receiver, "CoAP Receiver");
/*-----------------------------------------------------------------------------------*/
/*- Constants -----------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------------*/
const char* error_messages[] = {
"",
/* Memory errors */
"Transaction buffer allocation failed",
"Memory boundary exceeded",
/* CoAP errors */
"Request has unknown critical option", /*FIXME which one? */
"Packet could not be serialized"
};
/*-----------------------------------------------------------------------------------*/
/*- Variables -----------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------------*/
static service_callback_t service_cbk = NULL;
/*-----------------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------------*/
static
int
handle_incoming_data(void)
{
int error = NO_ERROR;
PRINTF("handle_incoming_data(): received uip_datalen=%u \n",(uint16_t)uip_datalen());
uint8_t *data = uip_appdata + uip_ext_len;
uint16_t data_len = uip_datalen() - uip_ext_len;
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), data_len );
PRINTBITS(data, data_len);
PRINTF("\n");
coap_packet_t message[1];
coap_transaction_t *transaction = NULL;
error = coap_parse_message(message, data, data_len);
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_ALLOC_ERR;
}
}
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, data, coap_serialize_message(message, data));
}
} /* if (new data) */
return error;
}
/*-----------------------------------------------------------------------------------*/
void
coap_receiver_init()
{
process_start(&coap_receiver, NULL);
}
/*-----------------------------------------------------------------------------------*/
void
coap_set_service_callback(service_callback_t callback)
{
service_cbk = callback;
}
/*-----------------------------------------------------------------------------------*/
rest_resource_flags_t
coap_get_rest_method(void *packet)
{
return (rest_resource_flags_t)(1 << (((coap_packet_t *)packet)->code - 1));
}
/*-----------------------------------------------------------------------------------*/
int
coap_set_rest_status(void *packet, unsigned int code)
{
if (code <= 0xFF)
{
((coap_packet_t *)packet)->code = (uint8_t) code;
return 1;
}
else
{
return 0;
}
}
/*-----------------------------------------------------------------------------------*/
/*- Server part ---------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------------*/
/* The discover resource should be included when using CoAP. */
RESOURCE(well_known_core, METHOD_GET, ".well-known/core", "");
void
well_known_core_handler(void* request, void* response, uint8_t *buffer, uint16_t preferred_size, int32_t *offset)
{
/* Response might be NULL for non-confirmable requests. */
if (response)
{
size_t strpos = 0;
size_t bufpos = 0;
resource_t* resource = NULL;
for (resource = (resource_t*)list_head(rest_get_resources()); resource; resource = resource->next)
{
strpos += snprintf((char *) buffer + bufpos, REST_MAX_CHUNK_SIZE - bufpos + 1,
"</%s>%s%s%s",
resource->url,
resource->attributes[0] ? ";" : "",
resource->attributes,
resource->next ? "," : "" );
PRINTF("discover: %s\n", resource->url);
if (strpos <= *offset)
{
/* Discard output before current block */
PRINTF(" if %d <= %ld B\n", strpos, *offset);
PRINTF(" %s\n", buffer);
bufpos = 0;
}
else /* (strpos > *offset) */
{
/* output partly in block */
size_t len = MIN(strpos - *offset, preferred_size);
PRINTF(" el %d/%d @ %ld B\n", len, preferred_size, *offset);
/* Block might start in the middle of the output; align with buffer start. */
if (bufpos == 0)
{
memmove(buffer, buffer+strlen((char *)buffer)-strpos+*offset, len);
}
bufpos = len;
PRINTF(" %s\n", buffer);
if (bufpos >= preferred_size)
{
break;
}
}
}
if (bufpos>0) {
coap_set_payload(response, buffer, bufpos );
coap_set_header_content_type(response, APPLICATION_LINK_FORMAT);
}
else
{
coap_set_rest_status(response, BAD_REQUEST_400);
coap_set_payload(response, (uint8_t*)"Block out of scope", 18);
}
if (resource==NULL) {
*offset = -1;
}
else
{
*offset += bufpos;
}
}
}
/*-----------------------------------------------------------------------------------*/
PROCESS_THREAD(coap_receiver, ev, data)
{
PROCESS_BEGIN();
PRINTF("Starting CoAP-03 receiver...\n");
rest_activate_resource(&resource_well_known_core);
coap_register_as_transaction_handler();
coap_init_connection(SERVER_LISTEN_PORT);
while(1) {
PROCESS_YIELD();
if(ev == tcpip_event) {
handle_incoming_data();
} else if (ev == PROCESS_EVENT_TIMER) {
/* retransmissions are handled here */
coap_check_transactions();
}
} /* while (1) */
PROCESS_END();
}
/*-----------------------------------------------------------------------------------*/
/*- Client part ---------------------------------------------------------------------*/
/*-----------------------------------------------------------------------------------*/
void blocking_request_callback(void *callback_data, void *response) {
struct request_state_t *state = (struct request_state_t *) callback_data;
state->response = (coap_packet_t*) response;
process_poll(state->process);
}
/*-----------------------------------------------------------------------------------*/
PT_THREAD(coap_blocking_request(struct request_state_t *state, process_event_t ev,
uip_ipaddr_t *remote_ipaddr, uint16_t remote_port,
coap_packet_t *request,
blocking_response_handler request_callback)) {
PT_BEGIN(&state->pt);
static uint8_t more;
static uint32_t res_block;
static uint8_t block_error;
state->block_num = 0;
state->response = NULL;
state->process = PROCESS_CURRENT();
more = 0;
res_block = 0;
block_error = 0;
do {
request->tid = coap_get_tid();
if ((state->transaction = coap_new_transaction(request->tid, remote_ipaddr, remote_port)))
{
state->transaction->callback = blocking_request_callback;
state->transaction->callback_data = state;
if (state->block_num>0)
{
coap_set_header_block(request, state->block_num, 0, REST_MAX_CHUNK_SIZE);
}
state->transaction->packet_len = coap_serialize_message(request, state->transaction->packet);
coap_send_transaction(state->transaction);
PRINTF("Requested #%lu (TID %u)\n", state->block_num, request->tid);
PT_YIELD_UNTIL(&state->pt, ev == PROCESS_EVENT_POLL);
if (!state->response)
{
PRINTF("Server not responding\n");
PT_EXIT(&state->pt);
}
coap_get_header_block(state->response, &res_block, &more, NULL, NULL);
PRINTF("Received #%lu%s (%u bytes)\n", res_block, more ? "+" : "", state->response->payload_len);
if (res_block==state->block_num)
{
request_callback(state->response);
++(state->block_num);
}
else
{
PRINTF("WRONG BLOCK %lu/%lu\n", res_block, state->block_num);
++block_error;
}
}
else
{
PRINTF("Could not allocate transaction buffer");
PT_EXIT(&state->pt);
}
} while (more && block_error<COAP_MAX_ATTEMPTS);
PT_END(&state->pt);
}
/*-----------------------------------------------------------------------------------*/
/*- Engine Interface ----------------------------------------------------------------*/
/*-----------------------------------------------------------------------------------*/
const struct rest_implementation coap_rest_implementation = {
"CoAP-03",
coap_receiver_init,
coap_set_service_callback,
coap_get_header_uri_path,
coap_set_header_uri_path,
coap_get_rest_method,
coap_set_rest_status,
coap_get_header_content_type,
coap_set_header_content_type,
NULL,
coap_get_header_max_age,
coap_set_header_max_age,
coap_set_header_etag,
NULL,
NULL,
coap_get_header_uri_host,
coap_set_header_location,
coap_get_payload,
coap_set_payload,
coap_get_header_uri_query,
coap_get_query_variable,
coap_get_post_variable,
coap_notify_observers,
(restful_post_handler) coap_observe_handler,
NULL,
NULL,
{
OK_200,
CREATED_201,
OK_200,
OK_200,
NOT_MODIFIED_304,
BAD_REQUEST_400,
METHOD_NOT_ALLOWED_405,
BAD_REQUEST_400,
METHOD_NOT_ALLOWED_405,
NOT_FOUND_404,
METHOD_NOT_ALLOWED_405,
BAD_REQUEST_400,
UNSUPPORTED_MADIA_TYPE_415,
INTERNAL_SERVER_ERROR_500,
CRITICAL_OPTION_NOT_SUPPORTED,
BAD_GATEWAY_502,
SERVICE_UNAVAILABLE_503,
GATEWAY_TIMEOUT_504,
INTERNAL_SERVER_ERROR_500
},
{
TEXT_PLAIN,
TEXT_XML,
TEXT_CSV,
TEXT_HTML,
IMAGE_GIF,
IMAGE_JPEG,
IMAGE_PNG,
IMAGE_TIFF,
AUDIO_RAW,
VIDEO_RAW,
APPLICATION_LINK_FORMAT,
APPLICATION_XML,
APPLICATION_OCTET_STREAM,
APPLICATION_RDF_XML,
APPLICATION_SOAP_XML,
APPLICATION_ATOM_XML,
APPLICATION_XMPP_XML,
APPLICATION_EXI,
APPLICATION_FASTINFOSET,
APPLICATION_SOAP_FASTINFOSET,
APPLICATION_JSON,
APPLICATION_OCTET_STREAM
}
};
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