/* 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.] */

#include <openssl_grpc/asn1.h>

#include <assert.h>
#include <stdlib.h>
#include <string.h>

#include <openssl_grpc/err.h>
#include <openssl_grpc/mem.h>
#include <openssl_grpc/obj.h>

#include "../internal.h"
#include "../lhash/internal.h"
#include "internal.h"


DEFINE_LHASH_OF(ASN1_STRING_TABLE)

static LHASH_OF(ASN1_STRING_TABLE) *string_tables = NULL;
static struct CRYPTO_STATIC_MUTEX string_tables_lock = CRYPTO_STATIC_MUTEX_INIT;

void ASN1_STRING_set_default_mask(unsigned long mask)
{
}

unsigned long ASN1_STRING_get_default_mask(void)
{
    return B_ASN1_UTF8STRING;
}

int ASN1_STRING_set_default_mask_asc(const char *p)
{
    return 1;
}

static const ASN1_STRING_TABLE *asn1_string_table_get(int nid);

/*
 * The following function generates an ASN1_STRING based on limits in a
 * table. Frequently the types and length of an ASN1_STRING are restricted by
 * a corresponding OID. For example certificates and certificate requests.
 */

ASN1_STRING *ASN1_STRING_set_by_NID(ASN1_STRING **out, const unsigned char *in,
                                    int len, int inform, int nid)
{
    ASN1_STRING *str = NULL;
    int ret;
    if (!out) {
        out = &str;
    }
    const ASN1_STRING_TABLE *tbl = asn1_string_table_get(nid);
    if (tbl != NULL) {
        unsigned long mask = tbl->mask;
        if (!(tbl->flags & STABLE_NO_MASK)) {
            mask &= B_ASN1_UTF8STRING;
        }
        ret = ASN1_mbstring_ncopy(out, in, len, inform, mask, tbl->minsize,
                                  tbl->maxsize);
    } else {
        ret = ASN1_mbstring_copy(out, in, len, inform, B_ASN1_UTF8STRING);
    }
    if (ret <= 0) {
        return NULL;
    }
    return *out;
}

/*
 * Now the tables and helper functions for the string table:
 */

/* See RFC 5280. */
#define ub_name                         32768
#define ub_common_name                  64
#define ub_locality_name                128
#define ub_state_name                   128
#define ub_organization_name            64
#define ub_organization_unit_name       64
#define ub_email_address                128
#define ub_serial_number                64

/* This table must be kept in NID order */

static const ASN1_STRING_TABLE tbl_standard[] = {
    {NID_commonName, 1, ub_common_name, DIRSTRING_TYPE, 0},
    {NID_countryName, 2, 2, B_ASN1_PRINTABLESTRING, STABLE_NO_MASK},
    {NID_localityName, 1, ub_locality_name, DIRSTRING_TYPE, 0},
    {NID_stateOrProvinceName, 1, ub_state_name, DIRSTRING_TYPE, 0},
    {NID_organizationName, 1, ub_organization_name, DIRSTRING_TYPE, 0},
    {NID_organizationalUnitName, 1, ub_organization_unit_name, DIRSTRING_TYPE,
     0},
    {NID_pkcs9_emailAddress, 1, ub_email_address, B_ASN1_IA5STRING,
     STABLE_NO_MASK},
    {NID_pkcs9_unstructuredName, 1, -1, PKCS9STRING_TYPE, 0},
    {NID_pkcs9_challengePassword, 1, -1, PKCS9STRING_TYPE, 0},
    {NID_pkcs9_unstructuredAddress, 1, -1, DIRSTRING_TYPE, 0},
    {NID_givenName, 1, ub_name, DIRSTRING_TYPE, 0},
    {NID_surname, 1, ub_name, DIRSTRING_TYPE, 0},
    {NID_initials, 1, ub_name, DIRSTRING_TYPE, 0},
    {NID_serialNumber, 1, ub_serial_number, B_ASN1_PRINTABLESTRING,
     STABLE_NO_MASK},
    {NID_friendlyName, -1, -1, B_ASN1_BMPSTRING, STABLE_NO_MASK},
    {NID_name, 1, ub_name, DIRSTRING_TYPE, 0},
    {NID_dnQualifier, -1, -1, B_ASN1_PRINTABLESTRING, STABLE_NO_MASK},
    {NID_domainComponent, 1, -1, B_ASN1_IA5STRING, STABLE_NO_MASK},
    {NID_ms_csp_name, -1, -1, B_ASN1_BMPSTRING, STABLE_NO_MASK}
};

static int table_cmp(const ASN1_STRING_TABLE *a, const ASN1_STRING_TABLE *b)
{
    if (a->nid < b->nid) {
        return -1;
    }
    if (a->nid > b->nid) {
        return 1;
    }
    return 0;
}

static int table_cmp_void(const void *a, const void *b)
{
    return table_cmp(a, b);
}

static uint32_t table_hash(const ASN1_STRING_TABLE *tbl)
{
    return OPENSSL_hash32(&tbl->nid, sizeof(tbl->nid));   
}

static const ASN1_STRING_TABLE *asn1_string_table_get(int nid)
{
    ASN1_STRING_TABLE key;
    key.nid = nid;
    const ASN1_STRING_TABLE *tbl =
        bsearch(&key, tbl_standard, OPENSSL_ARRAY_SIZE(tbl_standard),
                sizeof(ASN1_STRING_TABLE), table_cmp_void);
    if (tbl != NULL) {
        return tbl;
    }

    CRYPTO_STATIC_MUTEX_lock_read(&string_tables_lock);
    if (string_tables != NULL) {
        tbl = lh_ASN1_STRING_TABLE_retrieve(string_tables, &key);
    }
    CRYPTO_STATIC_MUTEX_unlock_read(&string_tables_lock);
    /* Note returning |tbl| without the lock is only safe because
     * |ASN1_STRING_TABLE_add| cannot modify or delete existing entries. If we
     * wish to support that, this function must copy the result under a lock. */
    return tbl;
}

int ASN1_STRING_TABLE_add(int nid, long minsize, long maxsize,
                          unsigned long mask, unsigned long flags)
{
    /* Existing entries cannot be overwritten. */
    if (asn1_string_table_get(nid) != NULL) {
        OPENSSL_PUT_ERROR(ASN1, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
        return 0;
    }

    int ret = 0;
    CRYPTO_STATIC_MUTEX_lock_write(&string_tables_lock);

    if (string_tables == NULL) {
        string_tables = lh_ASN1_STRING_TABLE_new(table_hash, table_cmp);
        if (string_tables == NULL) {
            goto err;
        }
    } else {
        /* Check again for an existing entry. One may have been added while
         * unlocked. */
        ASN1_STRING_TABLE key;
        key.nid = nid;
        if (lh_ASN1_STRING_TABLE_retrieve(string_tables, &key) != NULL) {
            OPENSSL_PUT_ERROR(ASN1, ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED);
            goto err;
        }
    }

    ASN1_STRING_TABLE *tbl = OPENSSL_malloc(sizeof(ASN1_STRING_TABLE));
    if (tbl == NULL) {
        goto err;
    }
    tbl->nid = nid;
    tbl->flags = flags;
    tbl->minsize = minsize;
    tbl->maxsize = maxsize;
    tbl->mask = mask;
    ASN1_STRING_TABLE *old_tbl;
    if (!lh_ASN1_STRING_TABLE_insert(string_tables, &old_tbl, tbl)) {
        OPENSSL_free(tbl);
        goto err;
    }
    assert(old_tbl == NULL);
    ret = 1;

err:
    CRYPTO_STATIC_MUTEX_unlock_write(&string_tables_lock);
    return ret;
}

void ASN1_STRING_TABLE_cleanup(void)
{
}

void asn1_get_string_table_for_testing(const ASN1_STRING_TABLE **out_ptr,
                                       size_t *out_len) {
    *out_ptr = tbl_standard;
    *out_len = OPENSSL_ARRAY_SIZE(tbl_standard);
}