/*

 * Copyright 1999-2018 The OpenSSL Project Authors. All Rights Reserved.

 *

 * Licensed under the OpenSSL license (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 <string.h>

#include "apps.h"

#include "progs.h"

#include <openssl/pem.h>

#include <openssl/err.h>

typedef enum OPTION_choice {

    OPT_ERR = -1, OPT_EOF = 0, OPT_HELP,

    OPT_TOSEQ, OPT_IN, OPT_OUT

} OPTION_CHOICE;

const OPTIONS nseq_options[] = {

    {"help", OPT_HELP, '-', "Display this summary"},

    {"toseq", OPT_TOSEQ, '-', "Output NS Sequence file"},

    {"in", OPT_IN, '<', "Input file"},

    {"out", OPT_OUT, '>', "Output file"},

    {NULL}

};

int nseq_main(int argc, char **argv)

{

    BIO *in = NULL, *out = NULL;

    X509 *x509 = NULL;

    NETSCAPE_CERT_SEQUENCE *seq = NULL;

    OPTION_CHOICE o;

    int toseq = 0, ret = 1, i;

    char *infile = NULL, *outfile = NULL, *prog;

    prog = opt_init(argc, argv, nseq_options);

    while ((o = opt_next()) != OPT_EOF) {

        switch (o) {

        case OPT_EOF:

        case OPT_ERR:

 opthelp:

            BIO_printf(bio_err, "%s: Use -help for summary.\n", prog);

            goto end;

        case OPT_HELP:

            ret = 0;

            opt_help(nseq_options);

            goto end;

        case OPT_TOSEQ:

            toseq = 1;

            break;

        case OPT_IN:

            infile = opt_arg();

            break;

        case OPT_OUT:

            outfile = opt_arg();

            break;

        }

    }

    argc = opt_num_rest();

    if (argc != 0)

        goto opthelp;

    in = bio_open_default(infile, 'r', FORMAT_PEM);

    if (in == NULL)

        goto end;

    out = bio_open_default(outfile, 'w', FORMAT_PEM);

    if (out == NULL)

        goto end;

    if (toseq) {

        seq = NETSCAPE_CERT_SEQUENCE_new();

        if (seq == NULL)

            goto end;

        seq->certs = sk_X509_new_null();

        if (seq->certs == NULL)

            goto end;

        while ((x509 = PEM_read_bio_X509(in, NULL, NULL, NULL)))

            sk_X509_push(seq->certs, x509);

        if (!sk_X509_num(seq->certs)) {

            BIO_printf(bio_err, "%s: Error reading certs file %s\n",

                       prog, infile);

            ERR_print_errors(bio_err);

            goto end;

        }

        PEM_write_bio_NETSCAPE_CERT_SEQUENCE(out, seq);

        ret = 0;

        goto end;

    }

    seq = PEM_read_bio_NETSCAPE_CERT_SEQUENCE(in, NULL, NULL, NULL);

    if (seq == NULL) {

        BIO_printf(bio_err, "%s: Error reading sequence file %s\n",

                   prog, infile);

        ERR_print_errors(bio_err);

        goto end;

    }

    for (i = 0; i < sk_X509_num(seq->certs); i++) {

        x509 = sk_X509_value(seq->certs, i);

        dump_cert_text(out, x509);

        PEM_write_bio_X509(out, x509);

    }

    ret = 0;

 end:

    BIO_free(in);

    BIO_free_all(out);

    NETSCAPE_CERT_SEQUENCE_free(seq);

    return ret;

}