tls: output warning of setDHParam to console.trace

To make it easy to figure out where the warning comes from.

Author: Shigeki Ohtsu

lib/_tls_common.js

@@ -99,7 +99,11 @@ exports.createSecureContext = function createSecureContext(options, context) {
   else if (options.ecdhCurve)
     c.context.setECDHCurve(options.ecdhCurve);
 
-  if (options.dhparam) c.context.setDHParam(options.dhparam);
+  if (options.dhparam) {
+    var warning = c.context.setDHParam(options.dhparam);
+    if (warning)
+      console.trace(warning);
+  }
 
   if (options.crl) {
     if (Array.isArray(options.crl)) {

src/node_crypto.cc

@@ -761,7 +761,8 @@ void SecureContext::SetDHParam(const FunctionCallbackInfo<Value>& args) {
   if (keylen < 1024)
     return env->ThrowError("DH parameter is less than 1024 bits");
   else if (keylen < 2048)
-    fprintf(stderr, "WARNING: DH parameter is less than 2048 bits\n");
+    args.GetReturnValue().Set(FIXED_ONE_BYTE_STRING(
+        env->isolate(), "WARNING: DH parameter is less than 2048 bits"));
 
   SSL_CTX_set_options(sc->ctx_, SSL_OP_SINGLE_DH_USE);
   int r = SSL_CTX_set_tmp_dh(sc->ctx_, dh);