/* $OpenBSD: conf_lib.c,v 1.14 2016/08/05 17:25:51 deraadt Exp $ */
/* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
 * project 2000.
 */
/* ====================================================================
 * Copyright (c) 2000 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 <stdio.h>
#include <openssl/crypto.h>
#include <openssl/err.h>
#include <openssl/conf.h>
#include <openssl/conf_api.h>
#include <openssl/lhash.h>

static CONF_METHOD *default_CONF_method = NULL;

/* Init a 'CONF' structure from an old LHASH */

void
CONF_set_nconf(CONF *conf, LHASH_OF(CONF_VALUE) *hash)
{
	if (default_CONF_method == NULL)
		default_CONF_method = NCONF_default();
	default_CONF_method->init(conf);
	conf->data = hash;
}

/* The following section contains the "CONF classic" functions,
   rewritten in terms of the new CONF interface. */

int
CONF_set_default_method(CONF_METHOD *meth)
{
	default_CONF_method = meth;
	return 1;
}

LHASH_OF(CONF_VALUE) *CONF_load(LHASH_OF(CONF_VALUE) *conf, const char *file,
    long *eline)
{
	LHASH_OF(CONF_VALUE) *ltmp;
	BIO *in = NULL;

	in = BIO_new_file(file, "rb");
	if (in == NULL) {
		CONFerr(CONF_F_CONF_LOAD, ERR_R_SYS_LIB);
		return NULL;
	}

	ltmp = CONF_load_bio(conf, in, eline);
	BIO_free(in);

	return ltmp;
}

LHASH_OF(CONF_VALUE) *CONF_load_fp(LHASH_OF(CONF_VALUE) *conf, FILE *fp,
    long *eline)
{
	BIO *btmp;
	LHASH_OF(CONF_VALUE) *ltmp;

	if (!(btmp = BIO_new_fp(fp, BIO_NOCLOSE))) {
		CONFerr(CONF_F_CONF_LOAD_FP, ERR_R_BUF_LIB);
		return NULL;
	}
	ltmp = CONF_load_bio(conf, btmp, eline);
	BIO_free(btmp);
	return ltmp;
}

LHASH_OF(CONF_VALUE) *CONF_load_bio(LHASH_OF(CONF_VALUE) *conf, BIO *bp,
    long *eline)
{
	CONF ctmp;
	int ret;

	CONF_set_nconf(&ctmp, conf);

	ret = NCONF_load_bio(&ctmp, bp, eline);
	if (ret)
		return ctmp.data;
	return NULL;
}

STACK_OF(CONF_VALUE) *CONF_get_section(LHASH_OF(CONF_VALUE) *conf,
    const char *section)
{
	if (conf == NULL) {
		return NULL;
	} else {
		CONF ctmp;
		CONF_set_nconf(&ctmp, conf);
		return NCONF_get_section(&ctmp, section);
	}
}

char *
CONF_get_string(LHASH_OF(CONF_VALUE) *conf, const char *group,
    const char *name)
{
	if (conf == NULL) {
		return NCONF_get_string(NULL, group, name);
	} else {
		CONF ctmp;
		CONF_set_nconf(&ctmp, conf);
		return NCONF_get_string(&ctmp, group, name);
	}
}

long
CONF_get_number(LHASH_OF(CONF_VALUE) *conf, const char *group,
    const char *name)
{
	int status;
	long result = 0;

	if (conf == NULL) {
		status = NCONF_get_number_e(NULL, group, name, &result);
	} else {
		CONF ctmp;
		CONF_set_nconf(&ctmp, conf);
		status = NCONF_get_number_e(&ctmp, group, name, &result);
	}

	if (status == 0) {
		/* This function does not believe in errors... */
		ERR_clear_error();
	}
	return result;
}

void
CONF_free(LHASH_OF(CONF_VALUE) *conf)
{
	CONF ctmp;

	CONF_set_nconf(&ctmp, conf);
	NCONF_free_data(&ctmp);
}

int
CONF_dump_fp(LHASH_OF(CONF_VALUE) *conf, FILE *out)
{
	BIO *btmp;
	int ret;

	if (!(btmp = BIO_new_fp(out, BIO_NOCLOSE))) {
		CONFerr(CONF_F_CONF_DUMP_FP, ERR_R_BUF_LIB);
		return 0;
	}
	ret = CONF_dump_bio(conf, btmp);
	BIO_free(btmp);
	return ret;
}

int
CONF_dump_bio(LHASH_OF(CONF_VALUE) *conf, BIO *out)
{
	CONF ctmp;

	CONF_set_nconf(&ctmp, conf);
	return NCONF_dump_bio(&ctmp, out);
}

/* The following section contains the "New CONF" functions.  They are
   completely centralised around a new CONF structure that may contain
   basically anything, but at least a method pointer and a table of data.
   These functions are also written in terms of the bridge functions used
   by the "CONF classic" functions, for consistency.  */

CONF *
NCONF_new(CONF_METHOD *meth)
{
	CONF *ret;

	if (meth == NULL)
		meth = NCONF_default();

	ret = meth->create(meth);
	if (ret == NULL) {
		CONFerr(CONF_F_NCONF_NEW, ERR_R_MALLOC_FAILURE);
		return (NULL);
	}

	return ret;
}

void
NCONF_free(CONF *conf)
{
	if (conf == NULL)
		return;
	conf->meth->destroy(conf);
}

void
NCONF_free_data(CONF *conf)
{
	if (conf == NULL)
		return;
	conf->meth->destroy_data(conf);
}

int
NCONF_load(CONF *conf, const char *file, long *eline)
{
	if (conf == NULL) {
		CONFerr(CONF_F_NCONF_LOAD, CONF_R_NO_CONF);
		return 0;
	}

	return conf->meth->load(conf, file, eline);
}

int
NCONF_load_fp(CONF *conf, FILE *fp, long *eline)
{
	BIO *btmp;
	int ret;

	if (!(btmp = BIO_new_fp(fp, BIO_NOCLOSE))) {
		CONFerr(CONF_F_NCONF_LOAD_FP, ERR_R_BUF_LIB);
		return 0;
	}
	ret = NCONF_load_bio(conf, btmp, eline);
	BIO_free(btmp);
	return ret;
}

int
NCONF_load_bio(CONF *conf, BIO *bp, long *eline)
{
	if (conf == NULL) {
		CONFerr(CONF_F_NCONF_LOAD_BIO, CONF_R_NO_CONF);
		return 0;
	}

	return conf->meth->load_bio(conf, bp, eline);
}

STACK_OF(CONF_VALUE) *
NCONF_get_section(const CONF *conf, const char *section)
{
	if (conf == NULL) {
		CONFerr(CONF_F_NCONF_GET_SECTION, CONF_R_NO_CONF);
		return NULL;
	}

	if (section == NULL) {
		CONFerr(CONF_F_NCONF_GET_SECTION, CONF_R_NO_SECTION);
		return NULL;
	}

	return _CONF_get_section_values(conf, section);
}

char *
NCONF_get_string(const CONF *conf, const char *group, const char *name)
{
	char *s = _CONF_get_string(conf, group, name);

        /* Since we may get a value from an environment variable even
           if conf is NULL, let's check the value first */
	if (s)
		return s;

	if (conf == NULL) {
		CONFerr(CONF_F_NCONF_GET_STRING,
		    CONF_R_NO_CONF_OR_ENVIRONMENT_VARIABLE);
		return NULL;
	}
	CONFerr(CONF_F_NCONF_GET_STRING, CONF_R_NO_VALUE);
	ERR_asprintf_error_data("group=%s name=%s",
	    group ? group : "", name);
	return NULL;
}

int
NCONF_get_number_e(const CONF *conf, const char *group, const char *name,
    long *result)
{
	char *str;

	if (result == NULL) {
		CONFerr(CONF_F_NCONF_GET_NUMBER_E, ERR_R_PASSED_NULL_PARAMETER);
		return 0;
	}

	str = NCONF_get_string(conf, group, name);

	if (str == NULL)
		return 0;

	for (*result = 0; conf->meth->is_number(conf, *str); ) {
		*result = (*result) * 10 + conf->meth->to_int(conf, *str);
		str++;
	}

	return 1;
}

int
NCONF_dump_fp(const CONF *conf, FILE *out)
{
	BIO *btmp;
	int ret;
	if (!(btmp = BIO_new_fp(out, BIO_NOCLOSE))) {
		CONFerr(CONF_F_NCONF_DUMP_FP, ERR_R_BUF_LIB);
		return 0;
	}
	ret = NCONF_dump_bio(conf, btmp);
	BIO_free(btmp);
	return ret;
}

int
NCONF_dump_bio(const CONF *conf, BIO *out)
{
	if (conf == NULL) {
		CONFerr(CONF_F_NCONF_DUMP_BIO, CONF_R_NO_CONF);
		return 0;
	}

	return conf->meth->dump(conf, out);
}