/*

 * Copyright 1995-2025 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

 */

#include <stdio.h>

#include "internal/cryptlib.h"

#include <openssl/objects.h>

#include <openssl/x509.h>

#include <openssl/buffer.h>

#include "crypto/x509.h"

#include "crypto/ctype.h"

/*

 * Limit to ensure we don't overflow: much greater than

 * anything encountered in practice.

 */

#define NAME_ONELINE_MAX    (1024 * 1024)

char *X509_NAME_oneline(const X509_NAME *a, char *buf, int len)

{

    const X509_NAME_ENTRY *ne;

    int i;

    int n, lold, l, l1, l2, num, j, type;

    int prev_set = -1;

    const char *s;

    char *p;

    unsigned char *q;

    BUF_MEM *b = NULL;

    int gs_doit[4];

    char tmp_buf[80];

#ifdef CHARSET_EBCDIC

    unsigned char ebcdic_buf[1024];

#endif

    if (buf == NULL) {

        if ((b = BUF_MEM_new()) == NULL)

            goto buferr;

        if (!BUF_MEM_grow(b, 200))

            goto buferr;

        b->data[0] = '\0';

        len = 200;

    } else if (len == 0) {

        return NULL;

    }

    if (a == NULL) {

        if (b) {

            buf = b->data;

            OPENSSL_free(b);

        }

        strncpy(buf, "NO X509_NAME", len);

        buf[len - 1] = '\0';

        return buf;

    }

    len--;                      /* space for '\0' */

    l = 0;

    for (i = 0; i < sk_X509_NAME_ENTRY_num(a->entries); i++) {

        ne = sk_X509_NAME_ENTRY_value(a->entries, i);

        n = OBJ_obj2nid(ne->object);

        if ((n == NID_undef) || ((s = OBJ_nid2sn(n)) == NULL)) {

            i2t_ASN1_OBJECT(tmp_buf, sizeof(tmp_buf), ne->object);

            s = tmp_buf;

        }

        l1 = (int)strlen(s);

        type = ne->value->type;

        num = ne->value->length;

        if (num > NAME_ONELINE_MAX) {

            ERR_raise(ERR_LIB_X509, X509_R_NAME_TOO_LONG);

            goto end;

        }

        q = ne->value->data;

#ifdef CHARSET_EBCDIC

        if (type == V_ASN1_GENERALSTRING ||

            type == V_ASN1_VISIBLESTRING ||

            type == V_ASN1_PRINTABLESTRING ||

            type == V_ASN1_TELETEXSTRING ||

            type == V_ASN1_IA5STRING) {

            if (num > (int)sizeof(ebcdic_buf))

                num = sizeof(ebcdic_buf);

            ascii2ebcdic(ebcdic_buf, q, num);

            q = ebcdic_buf;

        }

#endif

        if ((type == V_ASN1_GENERALSTRING) && ((num % 4) == 0)) {

            gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 0;

            for (j = 0; j < num; j++)

                if (q[j] != 0)

                    gs_doit[j & 3] = 1;

            if (gs_doit[0] | gs_doit[1] | gs_doit[2])

                gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;

            else {

                gs_doit[0] = gs_doit[1] = gs_doit[2] = 0;

                gs_doit[3] = 1;

            }

        } else

            gs_doit[0] = gs_doit[1] = gs_doit[2] = gs_doit[3] = 1;

        for (l2 = j = 0; j < num; j++) {

            if (!gs_doit[j & 3])

                continue;

            l2++;

            if (q[j] == '/' || q[j] == '+')

                l2++; /* char needs to be escaped */

            else if ((ossl_toascii(q[j]) < ossl_toascii(' ')) ||

                     (ossl_toascii(q[j]) > ossl_toascii('~')))

                l2 += 3;

        }

        lold = l;

        l += 1 + l1 + 1 + l2;

        if (l > NAME_ONELINE_MAX) {

            ERR_raise(ERR_LIB_X509, X509_R_NAME_TOO_LONG);

            goto end;

        }

        if (b != NULL) {

            if (!BUF_MEM_grow(b, l + 1))

                goto buferr;

            p = &(b->data[lold]);

        } else if (l > len) {

            break;

        } else

            p = &(buf[lold]);

        *(p++) = prev_set == ne->set ? '+' : '/';

        memcpy(p, s, (unsigned int)l1);

        p += l1;

        *(p++) = '=';

#ifndef CHARSET_EBCDIC          /* q was assigned above already. */

        q = ne->value->data;

#endif

        for (j = 0; j < num; j++) {

            if (!gs_doit[j & 3])

                continue;

#ifndef CHARSET_EBCDIC

            n = q[j];

            if ((n < ' ') || (n > '~')) {

                *(p++) = '\\';

                *(p++) = 'x';

                p += ossl_to_hex(p, n);

            } else {

                if (n == '/' || n == '+')

                    *(p++) = '\\';

                *(p++) = n;

            }

#else

            n = os_toascii[q[j]];

            if ((n < os_toascii[' ']) || (n > os_toascii['~'])) {

                *(p++) = '\\';

                *(p++) = 'x';

                p += ossl_to_hex(p, n);

            } else {

                if (n == os_toascii['/'] || n == os_toascii['+'])

                    *(p++) = '\\';

                *(p++) = q[j];

            }

#endif

        }

        *p = '\0';

        prev_set = ne->set;

    }

    if (b != NULL) {

        p = b->data;

        OPENSSL_free(b);

    } else

        p = buf;

    if (i == 0)

        *p = '\0';

    return p;

 buferr:

    ERR_raise(ERR_LIB_X509, ERR_R_BUF_LIB);

 end:

    BUF_MEM_free(b);

    return NULL;

}