openssl/crypto/conf/conf_api.c

/* conf_api.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
 * All rights reserved.
 *
 * This package is an SSL implementation written
 * by Eric Young (eay@cryptsoft.com).
 * The implementation was written so as to conform with Netscapes SSL.
 *
 * This library is free for commercial and non-commercial use as long as
 * the following conditions are aheared to.  The following conditions
 * apply to all code found in this distribution, be it the RC4, RSA,
 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
 * included with this distribution is covered by the same copyright terms
 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
 *
 * Copyright remains Eric Young's, and as such any Copyright notices in
 * the code are not to be removed.
 * If this package is used in a product, Eric Young should be given attribution
 * as the author of the parts of the library used.
 * This can be in the form of a textual message at program startup or
 * in documentation (online or textual) provided with the package.
 *
 * 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 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 acknowledgement:
 *    "This product includes cryptographic software written by
 *     Eric Young (eay@cryptsoft.com)"
 *    The word 'cryptographic' can be left out if the rouines from the library
 *    being used are not cryptographic related :-).
 * 4. If you include any Windows specific code (or a derivative thereof) from
 *    the apps directory (application code) you must include an acknowledgement:
 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
 *
 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 * ANY EXPRESS 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 AUTHOR OR 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.
 *
 * The licence and distribution terms for any publically available version or
 * derivative of this code cannot be changed.  i.e. this code cannot simply be
 * copied and put under another distribution licence
 * [including the GNU Public Licence.]
 */

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

#ifndef CONF_DEBUG
# undef NDEBUG                  /* avoid conflicting definitions */
# define NDEBUG
#endif

#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/conf.h>
#include <openssl/conf_api.h>
#include "e_os.h"

static void value_free_hash_doall_arg(CONF_VALUE *a,
                                      LHASH_OF(CONF_VALUE) *conf);
static void value_free_stack_doall(CONF_VALUE *a);
static IMPLEMENT_LHASH_DOALL_ARG_FN(value_free_hash, CONF_VALUE,
                                    LHASH_OF(CONF_VALUE))
static IMPLEMENT_LHASH_DOALL_FN(value_free_stack, CONF_VALUE)

/* Up until OpenSSL 0.9.5a, this was get_section */
CONF_VALUE *_CONF_get_section(const CONF *conf, const char *section)
{
    CONF_VALUE *v, vv;

    if ((conf == NULL) || (section == NULL))
        return (NULL);
    vv.name = NULL;
    vv.section = (char *)section;
    v = lh_CONF_VALUE_retrieve(conf->data, &vv);
    return (v);
}

/* Up until OpenSSL 0.9.5a, this was CONF_get_section */
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 ((STACK_OF(CONF_VALUE) *)v->value);
    else
        return (NULL);
}

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) {
        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 = 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 (v->value);
        else
            return (NULL);
    } else
        return (getenv(name));
}

static unsigned long conf_value_hash(const CONF_VALUE *v)
{
    return (lh_strhash(v->section) << 2) ^ 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)
            return (i);
    }

    if ((a->name != NULL) && (b->name != NULL)) {
        i = strcmp(a->name, b->name);
        return (i);
    } else if (a->name == b->name)
        return (0);
    else
        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;
}

void _CONF_free_data(CONF *conf)
{
    if (conf == NULL || 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_arg(conf->data,
                            LHASH_DOALL_ARG_FN(value_free_hash),
                            LHASH_OF(CONF_VALUE), conf->data);

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

    lh_CONF_VALUE_doall(conf->data, LHASH_DOALL_FN(value_free_stack));
    lh_CONF_VALUE_free(conf->data);
}

static void value_free_hash_doall_arg(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);
}

/* Up until OpenSSL 0.9.5a, this was new_section */
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);
    OPENSSL_assert(vv == NULL);
    return v;

 err:
    sk_CONF_VALUE_free(sk);
    OPENSSL_free(v);
    return NULL;
}