/* 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 <string.h>

#include <openssl_grpc/asn1.h>
#include <openssl_grpc/err.h>
#include <openssl_grpc/evp.h>
#include <openssl_grpc/obj.h>
#include <openssl_grpc/stack.h>
#include <openssl_grpc/x509.h>

#include "../internal.h"


int X509_NAME_get_text_by_NID(X509_NAME *name, int nid, char *buf, int len)
{
    const ASN1_OBJECT *obj;

    obj = OBJ_nid2obj(nid);
    if (obj == NULL)
        return (-1);
    return (X509_NAME_get_text_by_OBJ(name, obj, buf, len));
}

int X509_NAME_get_text_by_OBJ(X509_NAME *name, const ASN1_OBJECT *obj,
                              char *buf, int len)
{
    int i;
    ASN1_STRING *data;

    i = X509_NAME_get_index_by_OBJ(name, obj, -1);
    if (i < 0)
        return (-1);
    data = X509_NAME_ENTRY_get_data(X509_NAME_get_entry(name, i));
    i = (data->length > (len - 1)) ? (len - 1) : data->length;
    if (buf == NULL)
        return (data->length);
    OPENSSL_memcpy(buf, data->data, i);
    buf[i] = '\0';
    return (i);
}

int X509_NAME_entry_count(X509_NAME *name)
{
    if (name == NULL)
        return (0);
    return (sk_X509_NAME_ENTRY_num(name->entries));
}

int X509_NAME_get_index_by_NID(X509_NAME *name, int nid, int lastpos)
{
    const ASN1_OBJECT *obj;

    obj = OBJ_nid2obj(nid);
    if (obj == NULL)
        return (-2);
    return (X509_NAME_get_index_by_OBJ(name, obj, lastpos));
}

/* NOTE: you should be passsing -1, not 0 as lastpos */
int X509_NAME_get_index_by_OBJ(X509_NAME *name, const ASN1_OBJECT *obj,
                               int lastpos)
{
    int n;
    X509_NAME_ENTRY *ne;
    STACK_OF(X509_NAME_ENTRY) *sk;

    if (name == NULL)
        return (-1);
    if (lastpos < 0)
        lastpos = -1;
    sk = name->entries;
    n = sk_X509_NAME_ENTRY_num(sk);
    for (lastpos++; lastpos < n; lastpos++) {
        ne = sk_X509_NAME_ENTRY_value(sk, lastpos);
        if (OBJ_cmp(ne->object, obj) == 0)
            return (lastpos);
    }
    return (-1);
}

X509_NAME_ENTRY *X509_NAME_get_entry(X509_NAME *name, int loc)
{
    if (name == NULL || loc < 0
        || sk_X509_NAME_ENTRY_num(name->entries) <= (size_t)loc)
        return (NULL);
    else
        return (sk_X509_NAME_ENTRY_value(name->entries, loc));
}

X509_NAME_ENTRY *X509_NAME_delete_entry(X509_NAME *name, int loc)
{
    X509_NAME_ENTRY *ret;
    int i, n, set_prev, set_next;
    STACK_OF(X509_NAME_ENTRY) *sk;

    if (name == NULL || loc < 0
        || sk_X509_NAME_ENTRY_num(name->entries) <= (size_t)loc)
        return (NULL);
    sk = name->entries;
    ret = sk_X509_NAME_ENTRY_delete(sk, loc);
    n = sk_X509_NAME_ENTRY_num(sk);
    name->modified = 1;
    if (loc == n)
        return (ret);

    /* else we need to fixup the set field */
    if (loc != 0)
        set_prev = (sk_X509_NAME_ENTRY_value(sk, loc - 1))->set;
    else
        set_prev = ret->set - 1;
    set_next = sk_X509_NAME_ENTRY_value(sk, loc)->set;

    /*
     * set_prev is the previous set set is the current set set_next is the
     * following prev 1 1 1 1 1 1 1 1 set 1 1 2 2 next 1 1 2 2 2 2 3 2 so
     * basically only if prev and next differ by 2, then re-number down by 1
     */
    if (set_prev + 1 < set_next)
        for (i = loc; i < n; i++)
            sk_X509_NAME_ENTRY_value(sk, i)->set--;
    return (ret);
}

int X509_NAME_add_entry_by_OBJ(X509_NAME *name, ASN1_OBJECT *obj, int type,
                               unsigned char *bytes, int len, int loc,
                               int set)
{
    X509_NAME_ENTRY *ne;
    int ret;
    ne = X509_NAME_ENTRY_create_by_OBJ(NULL, obj, type, bytes, len);
    if (!ne)
        return 0;
    ret = X509_NAME_add_entry(name, ne, loc, set);
    X509_NAME_ENTRY_free(ne);
    return ret;
}

int X509_NAME_add_entry_by_NID(X509_NAME *name, int nid, int type,
                               unsigned char *bytes, int len, int loc,
                               int set)
{
    X509_NAME_ENTRY *ne;
    int ret;
    ne = X509_NAME_ENTRY_create_by_NID(NULL, nid, type, bytes, len);
    if (!ne)
        return 0;
    ret = X509_NAME_add_entry(name, ne, loc, set);
    X509_NAME_ENTRY_free(ne);
    return ret;
}

int X509_NAME_add_entry_by_txt(X509_NAME *name, const char *field, int type,
                               const unsigned char *bytes, int len, int loc,
                               int set)
{
    X509_NAME_ENTRY *ne;
    int ret;
    ne = X509_NAME_ENTRY_create_by_txt(NULL, field, type, bytes, len);
    if (!ne)
        return 0;
    ret = X509_NAME_add_entry(name, ne, loc, set);
    X509_NAME_ENTRY_free(ne);
    return ret;
}

/*
 * if set is -1, append to previous set, 0 'a new one', and 1, prepend to the
 * guy we are about to stomp on.
 */
int X509_NAME_add_entry(X509_NAME *name, X509_NAME_ENTRY *ne, int loc,
                        int set)
{
    X509_NAME_ENTRY *new_name = NULL;
    int n, i, inc;
    STACK_OF(X509_NAME_ENTRY) *sk;

    if (name == NULL)
        return (0);
    sk = name->entries;
    n = sk_X509_NAME_ENTRY_num(sk);
    if (loc > n)
        loc = n;
    else if (loc < 0)
        loc = n;

    name->modified = 1;

    if (set == -1) {
        if (loc == 0) {
            set = 0;
            inc = 1;
        } else {
            set = sk_X509_NAME_ENTRY_value(sk, loc - 1)->set;
            inc = 0;
        }
    } else {                    /* if (set >= 0) */

        if (loc >= n) {
            if (loc != 0)
                set = sk_X509_NAME_ENTRY_value(sk, loc - 1)->set + 1;
            else
                set = 0;
        } else
            set = sk_X509_NAME_ENTRY_value(sk, loc)->set;
        inc = (set == 0) ? 1 : 0;
    }

    if ((new_name = X509_NAME_ENTRY_dup(ne)) == NULL)
        goto err;
    new_name->set = set;
    if (!sk_X509_NAME_ENTRY_insert(sk, new_name, loc)) {
        OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
        goto err;
    }
    if (inc) {
        n = sk_X509_NAME_ENTRY_num(sk);
        for (i = loc + 1; i < n; i++)
            sk_X509_NAME_ENTRY_value(sk, i - 1)->set += 1;
    }
    return (1);
 err:
    if (new_name != NULL)
        X509_NAME_ENTRY_free(new_name);
    return (0);
}

X509_NAME_ENTRY *X509_NAME_ENTRY_create_by_txt(X509_NAME_ENTRY **ne,
                                               const char *field, int type,
                                               const unsigned char *bytes,
                                               int len)
{
    ASN1_OBJECT *obj;
    X509_NAME_ENTRY *nentry;

    obj = OBJ_txt2obj(field, 0);
    if (obj == NULL) {
        OPENSSL_PUT_ERROR(X509, X509_R_INVALID_FIELD_NAME);
        ERR_add_error_data(2, "name=", field);
        return (NULL);
    }
    nentry = X509_NAME_ENTRY_create_by_OBJ(ne, obj, type, bytes, len);
    ASN1_OBJECT_free(obj);
    return nentry;
}

X509_NAME_ENTRY *X509_NAME_ENTRY_create_by_NID(X509_NAME_ENTRY **ne, int nid,
                                               int type, unsigned char *bytes,
                                               int len)
{
    const ASN1_OBJECT *obj = OBJ_nid2obj(nid);
    if (obj == NULL) {
        OPENSSL_PUT_ERROR(X509, X509_R_UNKNOWN_NID);
        return NULL;
    }
    return X509_NAME_ENTRY_create_by_OBJ(ne, obj, type, bytes, len);
}

X509_NAME_ENTRY *X509_NAME_ENTRY_create_by_OBJ(X509_NAME_ENTRY **ne,
                                               const ASN1_OBJECT *obj,
                                               int type,
                                               const unsigned char *bytes,
                                               int len)
{
    X509_NAME_ENTRY *ret;

    if ((ne == NULL) || (*ne == NULL)) {
        if ((ret = X509_NAME_ENTRY_new()) == NULL)
            return (NULL);
    } else
        ret = *ne;

    if (!X509_NAME_ENTRY_set_object(ret, obj))
        goto err;
    if (!X509_NAME_ENTRY_set_data(ret, type, bytes, len))
        goto err;

    if ((ne != NULL) && (*ne == NULL))
        *ne = ret;
    return (ret);
 err:
    if ((ne == NULL) || (ret != *ne))
        X509_NAME_ENTRY_free(ret);
    return (NULL);
}

int X509_NAME_ENTRY_set_object(X509_NAME_ENTRY *ne, const ASN1_OBJECT *obj)
{
    if ((ne == NULL) || (obj == NULL)) {
        OPENSSL_PUT_ERROR(X509, ERR_R_PASSED_NULL_PARAMETER);
        return (0);
    }
    ASN1_OBJECT_free(ne->object);
    ne->object = OBJ_dup(obj);
    return ((ne->object == NULL) ? 0 : 1);
}

int X509_NAME_ENTRY_set_data(X509_NAME_ENTRY *ne, int type,
                             const unsigned char *bytes, int len)
{
    int i;

    if ((ne == NULL) || ((bytes == NULL) && (len != 0)))
        return (0);
    if ((type > 0) && (type & MBSTRING_FLAG))
        return ASN1_STRING_set_by_NID(&ne->value, bytes,
                                      len, type,
                                      OBJ_obj2nid(ne->object)) ? 1 : 0;
    if (len < 0)
        len = strlen((const char *)bytes);
    i = ASN1_STRING_set(ne->value, bytes, len);
    if (!i)
        return (0);
    if (type != V_ASN1_UNDEF) {
        if (type == V_ASN1_APP_CHOOSE)
            ne->value->type = ASN1_PRINTABLE_type(bytes, len);
        else
            ne->value->type = type;
    }
    return (1);
}

ASN1_OBJECT *X509_NAME_ENTRY_get_object(X509_NAME_ENTRY *ne)
{
    if (ne == NULL)
        return (NULL);
    return (ne->object);
}

ASN1_STRING *X509_NAME_ENTRY_get_data(X509_NAME_ENTRY *ne)
{
    if (ne == NULL)
        return (NULL);
    return (ne->value);
}
