/*
 * COPYRIGHT (c) International Business Machines Corp. 2012-2017
 *
 * This program is provided under the terms of the Common Public License,
 * version 1.0 (CPL-1.0). Any use, reproduction or distribution for this
 * software constitutes recipient's acceptance of CPL-1.0 terms which can be
 * found in the file LICENSE file or at
 * https://opensource.org/licenses/cpl1.0.php
 */

/*
 * OpenCryptoki ICSF token - LDAP functions
 *
 * Author: Marcelo Cerri (mhcerri@br.ibm.com)
 *
 */

#include <stdlib.h>
#include <string.h>
#include "attributes.h"
#include "defs.h"
#include "host_defs.h"
#include "h_extern.h"
#include "trace.h"
#include <openssl/crypto.h>

static void __cleanse_and_free_attribute_array(CK_ATTRIBUTE_PTR attrs,
                                               CK_ULONG attrs_len,
                                               CK_BBOOL cleanse)
{
    CK_ULONG i;

    if (!attrs)
        return;

    for (i = 0; i < attrs_len; i++)
        if (attrs[i].pValue) {
            if (cleanse)
                OPENSSL_cleanse(attrs[i].pValue, attrs[i].ulValueLen);
            free(attrs[i].pValue);
        }
    free(attrs);
}

/*
 * Free an array of attributes allocated with dup_attribute_array().
 */
void free_attribute_array(CK_ATTRIBUTE_PTR attrs, CK_ULONG attrs_len)
{
    __cleanse_and_free_attribute_array(attrs, attrs_len, FALSE);
}

/*
 * Free an array of attributes allocated with dup_attribute_array() and cleanse
 * all attribute values.
 */
void cleanse_and_free_attribute_array(CK_ATTRIBUTE_PTR attrs,
                                      CK_ULONG attrs_len)
{
    __cleanse_and_free_attribute_array(attrs, attrs_len, TRUE);
}

/*
 * Duplicate an array of attributes and all its values.
 *
 * The returned array must be freed with free_attribute_array().
 */
CK_RV dup_attribute_array(CK_ATTRIBUTE_PTR orig, CK_ULONG orig_len,
                          CK_ATTRIBUTE_PTR *p_dest, CK_ULONG *p_dest_len)
{
    CK_RV rc = CKR_OK;
    CK_ATTRIBUTE_PTR dest;
    CK_ULONG dest_len;
    CK_ATTRIBUTE_PTR it;

    /* Allocate the new array */
    dest_len = orig_len;
    dest = malloc(dest_len * sizeof(*dest));
    if (dest == NULL) {
        TRACE_ERROR("%s\n", ock_err(ERR_HOST_MEMORY));
        return CKR_HOST_MEMORY;
    }
    memset(dest, 0, dest_len);

    /* Copy each element */
    for (it = dest; it != (dest + orig_len); it++, orig++) {
        it->type = orig->type;
        it->ulValueLen = orig->ulValueLen;
        it->pValue = malloc(it->ulValueLen);
        if (it->pValue == NULL) {
            TRACE_ERROR("%s\n", ock_err(ERR_HOST_MEMORY));
            rc = CKR_HOST_MEMORY;
            goto done;
        }
        memcpy(it->pValue, orig->pValue, orig->ulValueLen);
    }

done:
    if (rc == CKR_OK) {
        *p_dest = dest;
        *p_dest_len = dest_len;
    } else {
        free_attribute_array(dest, dest_len);
    }

    return rc;
}

/*
 * Return the attribute structure for a given type.
 */
CK_ATTRIBUTE_PTR get_attribute_by_type(CK_ATTRIBUTE_PTR attrs,
                                       CK_ULONG attrs_len, CK_ULONG type)
{
    CK_ATTRIBUTE_PTR it;

    for (it = attrs; it != attrs + attrs_len; it++)
        if (it->type == type)
            return it;

    return NULL;
}

/*
 * Reallocate the attribute array and add the new element.
 */
CK_RV add_to_attribute_array(CK_ATTRIBUTE_PTR *p_attrs,
                             CK_ULONG_PTR p_attrs_len, CK_ULONG type,
                             CK_BYTE_PTR value, CK_ULONG value_len)
{
    CK_ATTRIBUTE_PTR attrs;
    CK_BYTE_PTR copied_value;

    copied_value = malloc(value_len);
    if (copied_value == NULL) {
        TRACE_ERROR("%s\n", ock_err(ERR_HOST_MEMORY));
        return CKR_HOST_MEMORY;
    }
    memcpy(copied_value, value, value_len);

    attrs = realloc(*p_attrs, sizeof(**p_attrs) * (*p_attrs_len + 1));
    if (attrs == NULL) {
        free(copied_value);
        TRACE_ERROR("%s\n", ock_err(ERR_HOST_MEMORY));
        return CKR_HOST_MEMORY;
    }

    attrs[*p_attrs_len].type = type;
    attrs[*p_attrs_len].pValue = copied_value;
    attrs[*p_attrs_len].ulValueLen = value_len;
    *p_attrs = attrs;
    *p_attrs_len += 1;

    return CKR_OK;
}