/* eng_cnf.c */

/*

 * Written by Stephen Henson (steve@openssl.org) for the OpenSSL project

 * 2001.

 */

/* ====================================================================

 * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * 1. Redistributions of source code must retain the above copyright

 *    notice, this list of conditions and the following disclaimer.

 *

 * 2. Redistributions in binary form must reproduce the above copyright

 *    notice, this list of conditions and the following disclaimer in

 *    the documentation and/or other materials provided with the

 *    distribution.

 *

 * 3. All advertising materials mentioning features or use of this

 *    software must display the following acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"

 *

 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to

 *    endorse or promote products derived from this software without

 *    prior written permission. For written permission, please contact

 *    licensing@OpenSSL.org.

 *

 * 5. Products derived from this software may not be called "OpenSSL"

 *    nor may "OpenSSL" appear in their names without prior written

 *    permission of the OpenSSL Project.

 *

 * 6. Redistributions of any form whatsoever must retain the following

 *    acknowledgment:

 *    "This product includes software developed by the OpenSSL Project

 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"

 *

 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY

 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR

 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT

 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,

 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)

 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED

 * OF THE POSSIBILITY OF SUCH DAMAGE.

 * ====================================================================

 *

 * This product includes cryptographic software written by Eric Young

 * (eay@cryptsoft.com).  This product includes software written by Tim

 * Hudson (tjh@cryptsoft.com).

 *

 */

#include "eng_int.h"

#include <openssl/conf.h>

/* #define ENGINE_CONF_DEBUG */

/* ENGINE config module */

static char *skip_dot(char *name)

{

    char *p;

    p = strchr(name, '.');

    if (p)

        return p + 1;

    return name;

}

static STACK_OF(ENGINE) *initialized_engines = NULL;

static int int_engine_init(ENGINE *e)

{

    if (!ENGINE_init(e))

        return 0;

    if (!initialized_engines)

        initialized_engines = sk_ENGINE_new_null();

    if (!initialized_engines || !sk_ENGINE_push(initialized_engines, e)) {

        ENGINE_finish(e);

        return 0;

    }

    return 1;

}

static int int_engine_configure(char *name, char *value, const CONF *cnf)

{

    int i;

    int ret = 0;

    long do_init = -1;

    STACK_OF(CONF_VALUE) *ecmds;

    CONF_VALUE *ecmd = NULL;

    char *ctrlname, *ctrlvalue;

    ENGINE *e = NULL;

    int soft = 0;

    name = skip_dot(name);

#ifdef ENGINE_CONF_DEBUG

    fprintf(stderr, "Configuring engine %s\n", name);

#endif

    /* Value is a section containing ENGINE commands */

    ecmds = NCONF_get_section(cnf, value);

    if (!ecmds) {

        ENGINEerr(ENGINE_F_INT_ENGINE_CONFIGURE,

                  ENGINE_R_ENGINE_SECTION_ERROR);

        return 0;

    }

    for (i = 0; i < sk_CONF_VALUE_num(ecmds); i++) {

        ecmd = sk_CONF_VALUE_value(ecmds, i);

        ctrlname = skip_dot(ecmd->name);

        ctrlvalue = ecmd->value;

#ifdef ENGINE_CONF_DEBUG

        fprintf(stderr, "ENGINE conf: doing ctrl(%s,%s)\n", ctrlname,

                ctrlvalue);

#endif

        /* First handle some special pseudo ctrls */

        /* Override engine name to use */

        if (!strcmp(ctrlname, "engine_id"))

            name = ctrlvalue;

        else if (!strcmp(ctrlname, "soft_load"))

            soft = 1;

        /* Load a dynamic ENGINE */

        else if (!strcmp(ctrlname, "dynamic_path")) {

            e = ENGINE_by_id("dynamic");

            if (!e)

                goto err;

            if (!ENGINE_ctrl_cmd_string(e, "SO_PATH", ctrlvalue, 0))

                goto err;

            if (!ENGINE_ctrl_cmd_string(e, "LIST_ADD", "2", 0))

                goto err;

            if (!ENGINE_ctrl_cmd_string(e, "LOAD", NULL, 0))

                goto err;

        }

        /* ... add other pseudos here ... */

        else {

            /*

             * At this point we need an ENGINE structural reference if we

             * don't already have one.

             */

            if (!e) {

                e = ENGINE_by_id(name);

                if (!e && soft) {

                    ERR_clear_error();

                    return 1;

                }

                if (!e)

                    goto err;

            }

            /*

             * Allow "EMPTY" to mean no value: this allows a valid "value" to

             * be passed to ctrls of type NO_INPUT

             */

            if (!strcmp(ctrlvalue, "EMPTY"))

                ctrlvalue = NULL;

            if (!strcmp(ctrlname, "init")) {

                if (!NCONF_get_number_e(cnf, value, "init", &do_init))

                    goto err;

                if (do_init == 1) {

                    if (!int_engine_init(e))

                        goto err;

                } else if (do_init != 0) {

                    ENGINEerr(ENGINE_F_INT_ENGINE_CONFIGURE,

                              ENGINE_R_INVALID_INIT_VALUE);

                    goto err;

                }

            } else if (!strcmp(ctrlname, "default_algorithms")) {

                if (!ENGINE_set_default_string(e, ctrlvalue))

                    goto err;

            } else if (!ENGINE_ctrl_cmd_string(e, ctrlname, ctrlvalue, 0))

                goto err;

        }

    }

    if (e && (do_init == -1) && !int_engine_init(e)) {

        ecmd = NULL;

        goto err;

    }

    ret = 1;

 err:

    if (ret != 1) {

        ENGINEerr(ENGINE_F_INT_ENGINE_CONFIGURE,

                  ENGINE_R_ENGINE_CONFIGURATION_ERROR);

        if (ecmd)

            ERR_add_error_data(6, "section=", ecmd->section,

                               ", name=", ecmd->name,

                               ", value=", ecmd->value);

    }

    if (e)

        ENGINE_free(e);

    return ret;

}

static int int_engine_module_init(CONF_IMODULE *md, const CONF *cnf)

{

    STACK_OF(CONF_VALUE) *elist;

    CONF_VALUE *cval;

    int i;

#ifdef ENGINE_CONF_DEBUG

    fprintf(stderr, "Called engine module: name %s, value %s\n",

            CONF_imodule_get_name(md), CONF_imodule_get_value(md));

#endif

    /* Value is a section containing ENGINEs to configure */

    elist = NCONF_get_section(cnf, CONF_imodule_get_value(md));

    if (!elist) {

        ENGINEerr(ENGINE_F_INT_ENGINE_MODULE_INIT,

                  ENGINE_R_ENGINES_SECTION_ERROR);

        return 0;

    }

    for (i = 0; i < sk_CONF_VALUE_num(elist); i++) {

        cval = sk_CONF_VALUE_value(elist, i);

        if (!int_engine_configure(cval->name, cval->value, cnf))

            return 0;

    }

    return 1;

}

static void int_engine_module_finish(CONF_IMODULE *md)

{

    ENGINE *e;

    while ((e = sk_ENGINE_pop(initialized_engines)))

        ENGINE_finish(e);

    sk_ENGINE_free(initialized_engines);

    initialized_engines = NULL;

}

void ENGINE_add_conf_module(void)

{

    CONF_module_add("engines",

                    int_engine_module_init, int_engine_module_finish);

}