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Fix tinyDTLS compilation

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The current code uses a dynamic array on the stack, a relatively rare
compiler extension. For example, MSVC does not support it.

The proposed changes use a classic dynamic array on the heap, which
greatly improves code compatibility. This will also enable libcoap to be
compiled alongside tinyDTLS using the Microsoft compiler on Windows.
This commit is contained in:
raspopov authored and Jon Shallow committed 2025-10-06 18:43:54 +01:00
1 parent e9c1b0b5ea
commit aaaf3d1324
1 file changed
+9 -10
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src/coap_tinydtls.c
+9 -10
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@@ -673,11 +673,16 @@ verify_ecdsa_key(struct dtls_context_t *dtls_context COAP_UNUSED,
int ret;
if (t_context && t_context->setup_data.validate_cn_call_back) {
coap_address_t remote_addr;
get_session_addr(dtls_session, &remote_addr);
coap_session_t *c_session = coap_session_get_by_peer(t_context->coap_context,
&remote_addr, dtls_session->ifindex);
if (!c_session)
return -3;
/* Need to build asn.1 certificate - code taken from tinydtls */
uint8 *p;
uint8 buf[DTLS_CE_LENGTH];
coap_session_t *c_session;
coap_address_t remote_addr;
uint8 *buf = coap_malloc_type(COAP_STRING, DTLS_CE_LENGTH);
/* Certificate
*
@@ -693,16 +698,10 @@ verify_ecdsa_key(struct dtls_context_t *dtls_context COAP_UNUSED,
memcpy(p, other_pub_y, key_size);
p += key_size;
assert(p <= (buf + sizeof(buf)));
get_session_addr(dtls_session, &remote_addr);
c_session = coap_session_get_by_peer(t_context->coap_context,
&remote_addr, dtls_session->ifindex);
if (!c_session)
return -3;
coap_lock_callback_ret(ret,
t_context->setup_data.validate_cn_call_back(COAP_DTLS_RPK_CERT_CN,
buf, p-buf, c_session, 0, 1, t_context->setup_data.cn_call_back_arg));
coap_free_type(COAP_STRING, buf);
if (!ret) {
return -1;
}