/*

 * Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the Apache License 2.0 (the "License").  You may not use

 * this file except in compliance with the License.  You can obtain a copy

 * in the file LICENSE in the source distribution or at

 * https://www.openssl.org/source/license.html

 */

/* Part of the code in here was originally in conf.c, which is now removed */

#include "e_os.h"

#include "internal/cryptlib.h"

#include <stdlib.h>

#include <string.h>

#include <openssl/conf.h>

#include <openssl/conf_api.h>

#include "conf_local.h"

static void value_free_hash(const CONF_VALUE *a, LHASH_OF(CONF_VALUE) *conf);

static void value_free_stack_doall(CONF_VALUE *a);

CONF_VALUE *_CONF_get_section(const CONF *conf, const char *section)

{

    CONF_VALUE vv;

    if (conf == NULL || section == NULL)

        return NULL;

    vv.name = NULL;

    vv.section = (char *)section;

    return conf->data != NULL ? lh_CONF_VALUE_retrieve(conf->data, &vv) : NULL;

}

STACK_OF(CONF_VALUE) *_CONF_get_section_values(const CONF *conf,

                                               const char *section)

{

    CONF_VALUE *v;

    v = _CONF_get_section(conf, section);

    if (v == NULL)

        return NULL;

    return ((STACK_OF(CONF_VALUE) *)v->value);

}

int _CONF_add_string(CONF *conf, CONF_VALUE *section, CONF_VALUE *value)

{

    CONF_VALUE *v = NULL;

    STACK_OF(CONF_VALUE) *ts;

    ts = (STACK_OF(CONF_VALUE) *)section->value;

    value->section = section->section;

    if (!sk_CONF_VALUE_push(ts, value))

        return 0;

    v = lh_CONF_VALUE_insert(conf->data, value);

    if (v != NULL) {

        (void)sk_CONF_VALUE_delete_ptr(ts, v);

        OPENSSL_free(v->name);

        OPENSSL_free(v->value);

        OPENSSL_free(v);

    }

    return 1;

}

char *_CONF_get_string(const CONF *conf, const char *section,

                       const char *name)

{

    CONF_VALUE *v, vv;

    char *p;

    if (name == NULL)

        return NULL;

    if (conf == NULL)

        return ossl_safe_getenv(name);

    if (conf->data == NULL)

        return NULL;

    if (section != NULL) {

        vv.name = (char *)name;

        vv.section = (char *)section;

        v = lh_CONF_VALUE_retrieve(conf->data, &vv);

        if (v != NULL)

            return v->value;

        if (strcmp(section, "ENV") == 0) {

            p = ossl_safe_getenv(name);

            if (p != NULL)

                return p;

        }

    }

    vv.section = "default";

    vv.name = (char *)name;

    v = lh_CONF_VALUE_retrieve(conf->data, &vv);

    if (v == NULL)

        return NULL;

    return v->value;

}

static unsigned long conf_value_hash(const CONF_VALUE *v)

{

    return (OPENSSL_LH_strhash(v->section) << 2) ^ OPENSSL_LH_strhash(v->name);

}

static int conf_value_cmp(const CONF_VALUE *a, const CONF_VALUE *b)

{

    int i;

    if (a->section != b->section) {

        i = strcmp(a->section, b->section);

        if (i != 0)

            return i;

    }

    if (a->name != NULL && b->name != NULL)

        return strcmp(a->name, b->name);

    if (a->name == b->name)

        return 0;

    return (a->name == NULL) ? -1 : 1;

}

int _CONF_new_data(CONF *conf)

{

    if (conf == NULL)

        return 0;

    if (conf->data == NULL) {

        conf->data = lh_CONF_VALUE_new(conf_value_hash, conf_value_cmp);

        if (conf->data == NULL)

            return 0;

    }

    return 1;

}

typedef LHASH_OF(CONF_VALUE) LH_CONF_VALUE;

IMPLEMENT_LHASH_DOALL_ARG_CONST(CONF_VALUE, LH_CONF_VALUE);

void _CONF_free_data(CONF *conf)

{

    if (conf == NULL)

        return;

    OPENSSL_free(conf->includedir);

    if (conf->data == NULL)

        return;

    /* evil thing to make sure the 'OPENSSL_free()' works as expected */

    lh_CONF_VALUE_set_down_load(conf->data, 0);

    lh_CONF_VALUE_doall_LH_CONF_VALUE(conf->data, value_free_hash, conf->data);

    /*

     * We now have only 'section' entries in the hash table. Due to problems

     * with

     */

    lh_CONF_VALUE_doall(conf->data, value_free_stack_doall);

    lh_CONF_VALUE_free(conf->data);

}

static void value_free_hash(const CONF_VALUE *a, LHASH_OF(CONF_VALUE) *conf)

{

    if (a->name != NULL)

        (void)lh_CONF_VALUE_delete(conf, a);

}

static void value_free_stack_doall(CONF_VALUE *a)

{

    CONF_VALUE *vv;

    STACK_OF(CONF_VALUE) *sk;

    int i;

    if (a->name != NULL)

        return;

    sk = (STACK_OF(CONF_VALUE) *)a->value;

    for (i = sk_CONF_VALUE_num(sk) - 1; i >= 0; i--) {

        vv = sk_CONF_VALUE_value(sk, i);

        OPENSSL_free(vv->value);

        OPENSSL_free(vv->name);

        OPENSSL_free(vv);

    }

    sk_CONF_VALUE_free(sk);

    OPENSSL_free(a->section);

    OPENSSL_free(a);

}

CONF_VALUE *_CONF_new_section(CONF *conf, const char *section)

{

    STACK_OF(CONF_VALUE) *sk = NULL;

    int i;

    CONF_VALUE *v = NULL, *vv;

    if ((sk = sk_CONF_VALUE_new_null()) == NULL)

        goto err;

    if ((v = OPENSSL_malloc(sizeof(*v))) == NULL)

        goto err;

    i = strlen(section) + 1;

    if ((v->section = OPENSSL_malloc(i)) == NULL)

        goto err;

    memcpy(v->section, section, i);

    v->name = NULL;

    v->value = (char *)sk;

    vv = lh_CONF_VALUE_insert(conf->data, v);

    if (vv != NULL || lh_CONF_VALUE_error(conf->data) > 0)

        goto err;

    return v;

 err:

    sk_CONF_VALUE_free(sk);

    if (v != NULL)

        OPENSSL_free(v->section);

    OPENSSL_free(v);

    return NULL;

}