* Copyright (c) 2009-2013 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "module-dir.h"
#include "iostream-ssl-private.h"

#include <stdlib.h>

static bool ssl_module_loaded = FALSE;
#ifdef HAVE_SSL
static struct module *ssl_module = NULL;
#endif
static const struct iostream_ssl_vfuncs *ssl_vfuncs = NULL;

#ifdef HAVE_SSL
static void ssl_module_unload(void)
{
	module_dir_unload(&ssl_module);
}
#endif

static int ssl_module_load(void)
{
#ifdef HAVE_SSL
	const char *plugin_name = "ssl_iostream_openssl";
	struct module_dir_load_settings mod_set;

	memset(&mod_set, 0, sizeof(mod_set));
	mod_set.abi_version = DOVECOT_ABI_VERSION;
	mod_set.setting_name = "<built-in lib-ssl-iostream lookup>";
	ssl_module = module_dir_load(MODULE_DIR, plugin_name, &mod_set);

	ssl_vfuncs = module_get_symbol(ssl_module, "ssl_vfuncs");
	if (ssl_vfuncs == NULL)
		i_fatal("%s: ssl_vfuncs symbol not found", plugin_name);

	atexit(ssl_module_unload);
	ssl_module_loaded = TRUE;
	return 0;
#else
	/* SSL not enabled */
	return -1;
#endif
}

int ssl_iostream_context_init_client(const char *source,
				     const struct ssl_iostream_settings *set,
				     struct ssl_iostream_context **ctx_r)
{
	if (!ssl_module_loaded) {
		if (ssl_module_load() < 0)
			return -1;
	}
	return ssl_vfuncs->context_init_client(source, set, ctx_r);
}

int ssl_iostream_context_init_server(const char *source,
				     const struct ssl_iostream_settings *set,
				     struct ssl_iostream_context **ctx_r)
{
	if (!ssl_module_loaded) {
		if (ssl_module_load() < 0)
			return -1;
	}
	return ssl_vfuncs->context_init_server(source, set, ctx_r);
}

void ssl_iostream_context_deinit(struct ssl_iostream_context **_ctx)
{
	struct ssl_iostream_context *ctx = *_ctx;

	*_ctx = NULL;
	ssl_vfuncs->context_deinit(ctx);
}

int ssl_iostream_generate_params(buffer_t *output)
{
	if (!ssl_module_loaded) {
		if (ssl_module_load() < 0)
			return -1;
	}
	return ssl_vfuncs->generate_params(output);
}

int ssl_iostream_context_import_params(struct ssl_iostream_context *ctx,
				       const buffer_t *input)
{
	return ssl_vfuncs->context_import_params(ctx, input);
}

int io_stream_create_ssl(struct ssl_iostream_context *ctx, const char *source,
			 const struct ssl_iostream_settings *set,
			 struct istream **input, struct ostream **output,
			 struct ssl_iostream **iostream_r)
{
	return ssl_vfuncs->create(ctx, source, set, input, output, iostream_r);
}

void ssl_iostream_unref(struct ssl_iostream **_ssl_io)
{
	struct ssl_iostream *ssl_io = *_ssl_io;

	*_ssl_io = NULL;
	ssl_vfuncs->unref(ssl_io);
}

void ssl_iostream_destroy(struct ssl_iostream **_ssl_io)
{
	struct ssl_iostream *ssl_io = *_ssl_io;

	*_ssl_io = NULL;
	ssl_vfuncs->destroy(ssl_io);
}

int ssl_iostream_handshake(struct ssl_iostream *ssl_io)
{
	return ssl_vfuncs->handshake(ssl_io);
}

void ssl_iostream_set_handshake_callback(struct ssl_iostream *ssl_io,
					 int (*callback)(void *context),
					 void *context)
{
	ssl_vfuncs->set_handshake_callback(ssl_io, callback, context);
}

bool ssl_iostream_is_handshaked(const struct ssl_iostream *ssl_io)
{
	return ssl_vfuncs->is_handshaked(ssl_io);
}

bool ssl_iostream_has_valid_client_cert(const struct ssl_iostream *ssl_io)
{
	return ssl_vfuncs->has_valid_client_cert(ssl_io);
}

bool ssl_iostream_has_broken_client_cert(struct ssl_iostream *ssl_io)
{
	return ssl_vfuncs->has_broken_client_cert(ssl_io);
}

int ssl_iostream_cert_match_name(struct ssl_iostream *ssl_io, const char *name)
{
	return ssl_vfuncs->cert_match_name(ssl_io, name);
}

const char *ssl_iostream_get_peer_name(struct ssl_iostream *ssl_io)
{
	return ssl_vfuncs->get_peer_name(ssl_io);
}

const char *ssl_iostream_get_security_string(struct ssl_iostream *ssl_io)
{
	return ssl_vfuncs->get_security_string(ssl_io);
}

const char *ssl_iostream_get_last_error(struct ssl_iostream *ssl_io)
{
	return ssl_vfuncs->get_last_error(ssl_io);
}