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Fix default CoAP header block2 size

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When a client sends a CoAP request with no block2 size,
the default one would be set to REST_MAX_CHUNK_SIZE.
However, this is not guaranteed to be a power of 2.
This can lead to clients receiving a bigger payload than expected as
part of the header, and ending up with duplicated content.
Setting the default to COAP_MAX_BLOCK_SIZE,
which is guaranteed to be a power of 2, fixes this.
This commit is contained in:
Arthur Fabre 2015-07-29 16:37:09 +01:00
parent d5956d5c75
commit 5403b2a211
1 changed files with 3 additions and 3 deletions
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6
apps/er-coap/er-coap-engine.c
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@ -104,7 +104,7 @@ coap_receive(void)
coap_new_transaction(message->mid, &UIP_IP_BUF->srcipaddr,
UIP_UDP_BUF->srcport))) {
uint32_t block_num = 0;
uint16_t block_size = REST_MAX_CHUNK_SIZE;
uint16_t block_size = COAP_MAX_BLOCK_SIZE;
uint32_t block_offset = 0;
int32_t new_offset = 0;
@ -125,8 +125,8 @@ coap_receive(void)
if(coap_get_header_block2
(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);
block_num, block_size, COAP_MAX_BLOCK_SIZE, block_offset);
block_size = MIN(block_size, COAP_MAX_BLOCK_SIZE);
new_offset = block_offset;
}