/*
* Copyright (c) 2013, 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
* /.well-known/core resource implementation.
* \author
* Matthias Kovatsch <kovatsch@inf.ethz.ch>
*/
#include <string.h>
#include "er-coap-engine.h"
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#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]", ((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])
#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])
#else
#define PRINTF(...)
#define PRINT6ADDR(addr)
#define PRINTLLADDR(addr)
#endif
#define ADD_CHAR_IF_POSSIBLE(char) \
if(strpos >= *offset && bufpos < preferred_size) { \
buffer[bufpos++] = char; \
} \
++strpos
#define ADD_STRING_IF_POSSIBLE(string, op) \
tmplen = strlen(string); \
if(strpos + tmplen > *offset) { \
bufpos += snprintf((char *)buffer + bufpos, \
preferred_size - bufpos + 1, \
"%s", \
string \
+ (*offset - (int32_t)strpos > 0 ? \
*offset - (int32_t)strpos : 0)); \
if(bufpos op preferred_size) { \
PRINTF("res: BREAK at %s (%p)\n", string, resource); \
break; \
} \
} \
strpos += tmplen
/*---------------------------------------------------------------------------*/
/*- Resource Handlers -------------------------------------------------------*/
/*---------------------------------------------------------------------------*/
void
well_known_core_get_handler(void *request, void *response, uint8_t *buffer,
uint16_t preferred_size, int32_t *offset)
{
size_t strpos = 0; /* position in overall string (which is larger than the buffer) */
size_t bufpos = 0; /* position within buffer (bytes written) */
size_t tmplen = 0;
resource_t *resource = NULL;
#if COAP_LINK_FORMAT_FILTERING
/* For filtering. */
const char *filter = NULL;
const char *attrib = NULL;
const char *found = NULL;
const char *end = NULL;
char *value = NULL;
char lastchar = '\0';
int len = coap_get_header_uri_query(request, &filter);
if(len) {
value = strchr(filter, '=');
value[0] = '\0';
++value;
len -= strlen(filter) + 1;
PRINTF("Filter %s = %.*s\n", filter, len, value);
if(strcmp(filter, "href") == 0 && value[0] == '/') {
++value;
--len;
}
lastchar = value[len - 1];
value[len - 1] = '\0';
}
#endif
for(resource = (resource_t *)list_head(rest_get_resources()); resource;
resource = resource->next) {
#if COAP_LINK_FORMAT_FILTERING
/* Filtering */
if(len) {
if(strcmp(filter, "href") == 0) {
attrib = strstr(resource->url, value);
if(attrib == NULL || (value[-1] == '/' && attrib != resource->url)) {
continue;
}
end = attrib + strlen(attrib);
} else if(resource->attributes != NULL) {
attrib = strstr(resource->attributes, filter);
if(attrib == NULL
|| (attrib[strlen(filter)] != '='
&& attrib[strlen(filter)] != '"')) {
continue;
}
attrib += strlen(filter) + 2;
end = strchr(attrib, '"');
}
PRINTF("Filter: res has attrib %s (%s)\n", attrib, value);
found = attrib;
while((found = strstr(found, value)) != NULL) {
if(found > end) {
found = NULL;
break;
}
if(lastchar == found[len - 1] || lastchar == '*') {
break;
}
++found;
}
if(found == NULL) {
continue;
}
PRINTF("Filter: res has prefix %s\n", found);
if(lastchar != '*'
&& (found[len] != '"' && found[len] != ' ' && found[len] != '\0')) {
continue;
}
PRINTF("Filter: res has match\n");
}
#endif
PRINTF("res: /%s (%p)\npos: s%zu, o%ld, b%zu\n", resource->url, resource,
strpos, (long)*offset, bufpos);
if(strpos > 0) {
ADD_CHAR_IF_POSSIBLE(',');
}
ADD_CHAR_IF_POSSIBLE('<');
ADD_CHAR_IF_POSSIBLE('/');
ADD_STRING_IF_POSSIBLE(resource->url, >=);
ADD_CHAR_IF_POSSIBLE('>');
if(resource->attributes != NULL && resource->attributes[0]) {
ADD_CHAR_IF_POSSIBLE(';');
ADD_STRING_IF_POSSIBLE(resource->attributes, >);
}
/* buffer full, but resource not completed yet; or: do not break if resource exactly fills buffer. */
if(bufpos > preferred_size && strpos - bufpos > *offset) {
PRINTF("res: BREAK at %s (%p)\n", resource->url, resource);
break;
}
}
if(bufpos > 0) {
PRINTF("BUF %zu: %.*s\n", bufpos, (int)bufpos, (char *)buffer);
coap_set_payload(response, buffer, bufpos);
coap_set_header_content_format(response, APPLICATION_LINK_FORMAT);
} else if(strpos > 0) {
PRINTF("well_known_core_handler(): bufpos<=0\n");
coap_set_status_code(response, BAD_OPTION_4_02);
coap_set_payload(response, "BlockOutOfScope", 15);
}
if(resource == NULL) {
PRINTF("res: DONE\n");
*offset = -1;
} else {
PRINTF("res: MORE at %s (%p)\n", resource->url, resource);
*offset += preferred_size;
}
}
/*---------------------------------------------------------------------------*/
RESOURCE(res_well_known_core, "ct=40", well_known_core_get_handler, NULL,
NULL, NULL);
/*---------------------------------------------------------------------------*/