/* 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/x509.h>

#include <inttypes.h>
#include <string.h>

#include <openssl/asn1.h>
#include <openssl/bio.h>
#include <openssl/obj.h>


static int maybe_write(BIO *out, const void *buf, int len)
{
    /* If |out| is NULL, ignore the output but report the length. */
    return out == NULL || BIO_write(out, buf, len) == len;
}

/* do_indent prints |indent| spaces to |out|. */
static int do_indent(BIO *out, int indent)
{
    for (int i = 0; i < indent; i++) {
        if (!maybe_write(out, " ", 1)) {
            return 0;
        }
    }
    return 1;
}

#define FN_WIDTH_LN     25
#define FN_WIDTH_SN     10

static int do_name_ex(BIO *out, const X509_NAME *n, int indent,
                      unsigned long flags)
{
    int i, prev = -1, orflags, cnt;
    int fn_opt, fn_nid;
    ASN1_OBJECT *fn;
    ASN1_STRING *val;
    X509_NAME_ENTRY *ent;
    char objtmp[80];
    const char *objbuf;
    int outlen, len;
    const char *sep_dn, *sep_mv, *sep_eq;
    int sep_dn_len, sep_mv_len, sep_eq_len;
    if (indent < 0)
        indent = 0;
    outlen = indent;
    if (!do_indent(out, indent))
        return -1;
    switch (flags & XN_FLAG_SEP_MASK) {
    case XN_FLAG_SEP_MULTILINE:
        sep_dn = "\n";
        sep_dn_len = 1;
        sep_mv = " + ";
        sep_mv_len = 3;
        break;

    case XN_FLAG_SEP_COMMA_PLUS:
        sep_dn = ",";
        sep_dn_len = 1;
        sep_mv = "+";
        sep_mv_len = 1;
        indent = 0;
        break;

    case XN_FLAG_SEP_CPLUS_SPC:
        sep_dn = ", ";
        sep_dn_len = 2;
        sep_mv = " + ";
        sep_mv_len = 3;
        indent = 0;
        break;

    case XN_FLAG_SEP_SPLUS_SPC:
        sep_dn = "; ";
        sep_dn_len = 2;
        sep_mv = " + ";
        sep_mv_len = 3;
        indent = 0;
        break;

    default:
        return -1;
    }

    if (flags & XN_FLAG_SPC_EQ) {
        sep_eq = " = ";
        sep_eq_len = 3;
    } else {
        sep_eq = "=";
        sep_eq_len = 1;
    }

    fn_opt = flags & XN_FLAG_FN_MASK;

    cnt = X509_NAME_entry_count(n);
    for (i = 0; i < cnt; i++) {
        if (flags & XN_FLAG_DN_REV)
            ent = X509_NAME_get_entry(n, cnt - i - 1);
        else
            ent = X509_NAME_get_entry(n, i);
        if (prev != -1) {
            if (prev == ent->set) {
                if (!maybe_write(out, sep_mv, sep_mv_len))
                    return -1;
                outlen += sep_mv_len;
            } else {
                if (!maybe_write(out, sep_dn, sep_dn_len))
                    return -1;
                outlen += sep_dn_len;
                if (!do_indent(out, indent))
                    return -1;
                outlen += indent;
            }
        }
        prev = ent->set;
        fn = X509_NAME_ENTRY_get_object(ent);
        val = X509_NAME_ENTRY_get_data(ent);
        fn_nid = OBJ_obj2nid(fn);
        if (fn_opt != XN_FLAG_FN_NONE) {
            int objlen, fld_len;
            if ((fn_opt == XN_FLAG_FN_OID) || (fn_nid == NID_undef)) {
                OBJ_obj2txt(objtmp, sizeof objtmp, fn, 1);
                fld_len = 0;    /* XXX: what should this be? */
                objbuf = objtmp;
            } else {
                if (fn_opt == XN_FLAG_FN_SN) {
                    fld_len = FN_WIDTH_SN;
                    objbuf = OBJ_nid2sn(fn_nid);
                } else if (fn_opt == XN_FLAG_FN_LN) {
                    fld_len = FN_WIDTH_LN;
                    objbuf = OBJ_nid2ln(fn_nid);
                } else {
                    fld_len = 0; /* XXX: what should this be? */
                    objbuf = "";
                }
            }
            objlen = strlen(objbuf);
            if (!maybe_write(out, objbuf, objlen))
                return -1;
            if ((objlen < fld_len) && (flags & XN_FLAG_FN_ALIGN)) {
                if (!do_indent(out, fld_len - objlen))
                    return -1;
                outlen += fld_len - objlen;
            }
            if (!maybe_write(out, sep_eq, sep_eq_len))
                return -1;
            outlen += objlen + sep_eq_len;
        }
        /*
         * If the field name is unknown then fix up the DER dump flag. We
         * might want to limit this further so it will DER dump on anything
         * other than a few 'standard' fields.
         */
        if ((fn_nid == NID_undef) && (flags & XN_FLAG_DUMP_UNKNOWN_FIELDS))
            orflags = ASN1_STRFLGS_DUMP_ALL;
        else
            orflags = 0;

        len = ASN1_STRING_print_ex(out, val, flags | orflags);
        if (len < 0)
            return -1;
        outlen += len;
    }
    return outlen;
}

int X509_NAME_print_ex(BIO *out, const X509_NAME *nm, int indent,
                       unsigned long flags)
{
    if (flags == XN_FLAG_COMPAT)
        return X509_NAME_print(out, nm, indent);
    return do_name_ex(out, nm, indent, flags);
}

int X509_NAME_print_ex_fp(FILE *fp, const X509_NAME *nm, int indent,
                          unsigned long flags)
{
    BIO *bio = NULL;
    if (fp != NULL) {
        /* If |fp| is NULL, this function returns the number of bytes without
         * writing. */
        bio = BIO_new_fp(fp, BIO_NOCLOSE);
        if (bio == NULL) {
            return -1;
        }
    }
    int ret = X509_NAME_print_ex(bio, nm, indent, flags);
    BIO_free(bio);
    return ret;
}