curl build don't recognize openssl engine

[helenebb]

I build curl to use it with OpenSSL with command :
nmake /f Makefile.vc mode=dll WITH_SSL=dll SSL_PATH=C:\OpenSSL-Win32

OpenSSL is : OpenSSL 1.0.2o 27 Mar 2018
I have add my engine on openssl configuration file (OPENSSL_CONF=C:\OpenSSL-Win32\bin\openssl.cfg

[openssl_init]
engines=engine_section

[engine_section]
pkcs11=pkcs11_section

[pkcs11_section]
engine_id=pkcs11
dynamic_path=C:/Users/Helene/Desktop/libp11-0.4.7/libp11-0.4.7/src/pkcs11.dll
MODULE_PATH=C:/Windows/SysWOW64/module.dll
init=0

When I list engine with OpenSSL, my engine is OK :

>openssl engine -t
(rdrand) Intel RDRAND engine
     [ available ]
(dynamic) Dynamic engine loading support
     [ unavailable ]
(pkcs11) pkcs11 engine
     [ available ]

But if I list engine with my build curl, I have nothing :

>curl.exe --engine list
Build-time engines:
  <none>

If I use installed curl (with SSL support), I have no problem.

Is it my build curl not correct ?

[bagder]

I'm pretty sure that's because your build doesn't have HAVE_OPENSSL_ENGINE_H defined. See the code that lists the available engines:

curl/lib/vtls/openssl.c

Lines 1167 to 1185 in 9ff67f7

	static struct curl_slist *Curl_ossl_engines_list(struct Curl_easy *data)
	{
	struct curl_slist *list = NULL;
	#if defined(USE_OPENSSL) && defined(HAVE_OPENSSL_ENGINE_H)
	struct curl_slist *beg;
	ENGINE *e;
	for(e = ENGINE_get_first(); e; e = ENGINE_get_next(e)) {
	beg = curl_slist_append(list, ENGINE_get_id(e));
	if(!beg) {
	curl_slist_free_all(list);
	return NULL;
	}
	list = beg;
	}
	#endif
	(void) data;
	return list;
	}

[helenebb]

Indeed, it was the problem. Thank you for your help

[bagder]

I'm not exactly sure what fix I propose for this, but I think the engine support is there by default since some openssl version and would probably be a better check.