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Use ALPN when using 443 as endpoint port (MbedTLS only) #78

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Use ALPN when using 443 as endpoint port (MbedTLS only) #78

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16 changes: 16 additions & 0 deletions network/MbedTLS/MbedTLSConnection.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -28,6 +28,14 @@
#define MBEDTLS_WRAPPER_LOG_TAG "[MbedTLS Wrapper]"
#define MAX_CHARS_IN_PORT_NUMBER 6

#if defined(MBEDTLS_SSL_ALPN)
const bool ALPN_ENABLED = true;
const char* ALPN_PROTOCOLS[] = {"x-amzn-mqtt-ca", nullptr};
#else
const bool ALPN_ENABLED = false;
const char* ALPN_PROTOCOLS[] = {nullptr};
#endif

namespace awsiotsdk {
namespace network {
MbedTLSConnection::MbedTLSConnection(util::String endpoint,
Expand Down Expand Up @@ -97,6 +105,14 @@ namespace awsiotsdk {
mbedtls_x509_crt_init(&clicert_);
mbedtls_pk_init(&pkey_);

if (443 == endpoint_port_) {
if (ALPN_ENABLED) {
mbedtls_ssl_conf_alpn_protocols(&conf_, ALPN_PROTOCOLS);
} else {
AWS_LOG_INFO(MBEDTLS_WRAPPER_LOG_TAG, "Warning: using 443 as endpoint port but MbedTLS was built without ALPN support.\n");
}
}

requires_free_ = true;

AWS_LOG_INFO(MBEDTLS_WRAPPER_LOG_TAG, "...............................%d", MBEDTLS_SSL_MAX_CONTENT_LEN);
Expand Down