256 lines
8.7 KiB
C
256 lines
8.7 KiB
C
/*
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* Copyright (c) 2011, Institute for Pervasive Computing, ETH Zurich
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* All rights reserved.
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*
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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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* \file
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* CoAP module for observing resources
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* \author
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* Matthias Kovatsch <kovatsch@inf.ethz.ch>
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*/
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#include <stdio.h>
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#include <string.h>
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#include "er-coap-07-observing.h"
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#define DEBUG 0
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#if DEBUG
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#define PRINTF(...) printf(__VA_ARGS__)
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#define PRINT6ADDR(addr) PRINTF("[%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x]", ((uint8_t *)addr)[0], ((uint8_t *)addr)[1], ((uint8_t *)addr)[2], ((uint8_t *)addr)[3], ((uint8_t *)addr)[4], ((uint8_t *)addr)[5], ((uint8_t *)addr)[6], ((uint8_t *)addr)[7], ((uint8_t *)addr)[8], ((uint8_t *)addr)[9], ((uint8_t *)addr)[10], ((uint8_t *)addr)[11], ((uint8_t *)addr)[12], ((uint8_t *)addr)[13], ((uint8_t *)addr)[14], ((uint8_t *)addr)[15])
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#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])
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#else
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#define PRINTF(...)
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#define PRINT6ADDR(addr)
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#define PRINTLLADDR(addr)
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#endif
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MEMB(observers_memb, coap_observer_t, COAP_MAX_OBSERVERS);
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LIST(observers_list);
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/*-----------------------------------------------------------------------------------*/
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coap_observer_t *
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coap_add_observer(uip_ipaddr_t *addr, uint16_t port, const uint8_t *token, size_t token_len, const char *url)
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{
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/* Remove existing observe relationship, if any. */
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coap_remove_observer_by_url(addr, port, url);
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coap_observer_t *o = memb_alloc(&observers_memb);
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if (o)
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{
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o->url = url;
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uip_ipaddr_copy(&o->addr, addr);
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o->port = port;
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o->token_len = token_len;
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memcpy(o->token, token, token_len);
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o->last_mid = 0;
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stimer_set(&o->refresh_timer, COAP_OBSERVING_REFRESH_INTERVAL);
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PRINTF("Adding observer for /%s [0x%02X%02X]\n", o->url, o->token[0], o->token[1]);
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list_add(observers_list, o);
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}
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return o;
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}
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/*-----------------------------------------------------------------------------------*/
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void
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coap_remove_observer(coap_observer_t *o)
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{
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PRINTF("Removing observer for /%s [0x%02X%02X]\n", o->url, o->token[0], o->token[1]);
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memb_free(&observers_memb, o);
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list_remove(observers_list, o);
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}
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int
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coap_remove_observer_by_client(uip_ipaddr_t *addr, uint16_t port)
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{
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int removed = 0;
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coap_observer_t* obs = NULL;
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for (obs = (coap_observer_t*)list_head(observers_list); obs; obs = obs->next)
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{
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PRINTF("Remove check client ");
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PRINT6ADDR(addr);
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PRINTF(":%u\n", port);
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if (uip_ipaddr_cmp(&obs->addr, addr) && obs->port==port)
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{
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coap_remove_observer(obs);
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removed++;
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}
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}
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return removed;
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}
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int
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coap_remove_observer_by_token(uip_ipaddr_t *addr, uint16_t port, uint8_t *token, size_t token_len)
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{
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int removed = 0;
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coap_observer_t* obs = NULL;
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for (obs = (coap_observer_t*)list_head(observers_list); obs; obs = obs->next)
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{
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PRINTF("Remove check Token 0x%02X%02X\n", token[0], token[1]);
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if (uip_ipaddr_cmp(&obs->addr, addr) && obs->port==port && obs->token_len==token_len && memcmp(obs->token, token, token_len)==0)
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{
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coap_remove_observer(obs);
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removed++;
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}
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}
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return removed;
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}
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int
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coap_remove_observer_by_url(uip_ipaddr_t *addr, uint16_t port, const char *url)
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{
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int removed = 0;
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coap_observer_t* obs = NULL;
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for (obs = (coap_observer_t*)list_head(observers_list); obs; obs = obs->next)
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{
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PRINTF("Remove check URL %p\n", url);
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if (uip_ipaddr_cmp(&obs->addr, addr) && obs->port==port && (obs->url==url || memcmp(obs->url, url, strlen(obs->url))==0))
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{
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coap_remove_observer(obs);
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removed++;
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}
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}
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return removed;
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}
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int
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coap_remove_observer_by_mid(uip_ipaddr_t *addr, uint16_t port, uint16_t mid)
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{
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int removed = 0;
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coap_observer_t* obs = NULL;
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for (obs = (coap_observer_t*)list_head(observers_list); obs; obs = obs->next)
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{
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PRINTF("Remove check MID %u\n", mid);
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if (uip_ipaddr_cmp(&obs->addr, addr) && obs->port==port && obs->last_mid==mid)
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{
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coap_remove_observer(obs);
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removed++;
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}
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}
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return removed;
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}
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/*-----------------------------------------------------------------------------------*/
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void
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coap_notify_observers(resource_t *resource, uint16_t obs_counter, void *notification)
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{
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coap_packet_t *const coap_res = (coap_packet_t *) notification;
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coap_observer_t* obs = NULL;
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uint8_t preferred_type = coap_res->type;
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PRINTF("Observing: Notification from %s\n", resource->url);
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/* Iterate over observers. */
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for (obs = (coap_observer_t*)list_head(observers_list); obs; obs = obs->next)
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{
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if (obs->url==resource->url) /* using RESOURCE url pointer as handle */
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{
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coap_transaction_t *transaction = NULL;
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/*TODO implement special transaction for CON, sharing the same buffer to allow for more observers. */
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if ( (transaction = coap_new_transaction(coap_get_mid(), &obs->addr, obs->port)) )
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{
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PRINTF(" Observer ");
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PRINT6ADDR(&obs->addr);
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PRINTF(":%u\n", obs->port);
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/* Update last MID for RST matching. */
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obs->last_mid = transaction->mid;
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/* Prepare response */
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coap_res->mid = transaction->mid;
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coap_set_header_observe(coap_res, obs_counter);
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coap_set_header_token(coap_res, obs->token, obs->token_len);
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/* Use CON to check whether client is still there/interested after COAP_OBSERVING_REFRESH_INTERVAL. */
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if (stimer_expired(&obs->refresh_timer))
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{
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PRINTF(" Refreshing with CON\n");
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coap_res->type = COAP_TYPE_CON;
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stimer_restart(&obs->refresh_timer);
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}
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else
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{
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coap_res->type = preferred_type;
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}
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transaction->packet_len = coap_serialize_message(coap_res, transaction->packet);
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coap_send_transaction(transaction);
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}
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}
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}
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}
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/*-----------------------------------------------------------------------------------*/
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void
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coap_observe_handler(resource_t *resource, void *request, void *response)
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{
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coap_packet_t *const coap_req = (coap_packet_t *) request;
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coap_packet_t *const coap_res = (coap_packet_t *) response;
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static char content[16];
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if (coap_req->code==COAP_GET && coap_res->code<128) /* GET request and response without error code */
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{
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if (IS_OPTION(coap_req, COAP_OPTION_OBSERVE))
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{
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if (coap_add_observer(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport, coap_req->token, coap_req->token_len, resource->url))
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{
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coap_set_header_observe(coap_res, 0);
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/*
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* For demonstration purposes only. A subscription should return the same representation as a normal GET.
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* TODO: Comment the following line for any real application.
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*/
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coap_set_payload(coap_res, content, snprintf(content, sizeof(content), "Added %u/%u", list_length(observers_list), COAP_MAX_OBSERVERS));
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}
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else
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{
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coap_res->code = SERVICE_UNAVAILABLE_5_03;
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coap_set_payload(coap_res, "TooManyObservers", 16);
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} /* if (added observer) */
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}
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else /* if (observe) */
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{
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/* Remove client if it is currently observing. */
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coap_remove_observer_by_url(&UIP_IP_BUF->srcipaddr, UIP_UDP_BUF->srcport, resource->url);
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} /* if (observe) */
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}
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}
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