/* conf_lib.c */
/* 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>

const char *CONF_version="CONF" OPENSSL_VERSION_PTEXT;

static CONF_METHOD *default_CONF_method=NULL;

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

#ifdef VMS
	in=BIO_new_file(file, "r");
#else
	in=BIO_new_file(file, "rb");
#endif
	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;
	}

#ifndef NO_FP_API
LHASH *CONF_load_fp(LHASH *conf, FILE *fp,long *eline)
	{
	BIO *btmp;
	LHASH *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;
	}
#endif

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

	if (default_CONF_method == NULL)
		default_CONF_method = NCONF_default();

	default_CONF_method->init(&ctmp);
	ctmp.data = conf;
	ret = NCONF_load_bio(&ctmp, bp, eline);
	if (ret)
		return ctmp.data;
	return NULL;
	}

STACK_OF(CONF_VALUE) *CONF_get_section(LHASH *conf,char *section)
	{
	if (conf == NULL)
		{
		return NULL;
		}
	else
		{
		CONF ctmp;

		if (default_CONF_method == NULL)
			default_CONF_method = NCONF_default();

		default_CONF_method->init(&ctmp);
		ctmp.data = conf;
		return NCONF_get_section(&ctmp, section);
		}
	}

char *CONF_get_string(LHASH *conf,char *group,char *name)
	{
	if (conf == NULL)
		{
		return NCONF_get_string(NULL, group, name);
		}
	else
		{
		CONF ctmp;

		if (default_CONF_method == NULL)
			default_CONF_method = NCONF_default();

		default_CONF_method->init(&ctmp);
		ctmp.data = conf;
		return NCONF_get_string(&ctmp, group, name);
		}
	}

long CONF_get_number(LHASH *conf,char *group,char *name)
	{
	if (conf == NULL)
		{
		return NCONF_get_number(NULL, group, name);
		}
	else
		{
		CONF ctmp;

		if (default_CONF_method == NULL)
			default_CONF_method = NCONF_default();

		default_CONF_method->init(&ctmp);
		ctmp.data = conf;
		return NCONF_get_number(&ctmp, group, name);
		}
	}

void CONF_free(LHASH *conf)
	{
	CONF ctmp;

	if (default_CONF_method == NULL)
		default_CONF_method = NCONF_default();

	default_CONF_method->init(&ctmp);
	ctmp.data = conf;
	NCONF_free_data(&ctmp);
	}

#ifndef NO_FP_API
int CONF_dump_fp(LHASH *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;
	}
#endif

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

	if (default_CONF_method == NULL)
		default_CONF_method = NCONF_default();

	default_CONF_method->init(&ctmp);
	ctmp.data = 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)
	{
	int ret;
	BIO *in=NULL;

#ifdef VMS
	in=BIO_new_file(file, "r");
#else
	in=BIO_new_file(file, "rb");
#endif
	if (in == NULL)
		{
		CONFerr(CONF_F_CONF_LOAD,ERR_R_SYS_LIB);
		return 0;
		}

	ret = NCONF_load_bio(conf, in, eline);
	BIO_free(in);

	return ret;
	}

#ifndef NO_FP_API
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_CONF_LOAD_FP,ERR_R_BUF_LIB);
		return 0;
		}
	ret = NCONF_load_bio(conf, btmp, eline);
	BIO_free(btmp);
	return ret;
	}
#endif

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(conf, bp, eline);
	}

STACK_OF(CONF_VALUE) *NCONF_get_section(CONF *conf,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(CONF *conf,char *group,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;
		}
	return NULL;
	}

long NCONF_get_number(CONF *conf,char *group,char *name)
	{
#if 0 /* As with _CONF_get_string(), we rely on the possibility of finding
         an environment variable with a suitable name.  Unfortunately, there's
         no way with the current API to see if we found one or not...
         The meaning of this is that if a number is not found anywhere, it
         will always default to 0. */
	if (conf == NULL)
		{
		CONFerr(CONF_F_NCONF_GET_NUMBER,
                        CONF_R_NO_CONF_OR_ENVIRONMENT_VARIABLE);
		return 0;
		}
#endif
	
	return _CONF_get_number(conf, group, name);
	}

#ifndef NO_FP_API
int NCONF_dump_fp(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;
	}
#endif

int NCONF_dump_bio(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);
	}