int ts_main(int argc, char **argv)
{
    CONF *conf = NULL;
    char *CAfile = NULL, *untrusted = NULL, *engine = NULL, *prog, **helpp;
    char *configfile = default_config_file;
    char *section = NULL, *password = NULL;
    char *data = NULL, *digest = NULL, *rnd = NULL, *policy = NULL;
    char *in = NULL, *out = NULL, *queryfile = NULL, *passin = NULL;
    char *inkey = NULL, *signer = NULL, *chain = NULL, *CApath = NULL;
    const EVP_MD *md = NULL;
    OPTION_CHOICE o, mode = OPT_ERR;
    int ret = 1, no_nonce = 0, cert = 0, text = 0;
    int vpmtouched = 0;
    X509_VERIFY_PARAM *vpm = NULL;
    /* Input is ContentInfo instead of TimeStampResp. */
    int token_in = 0;
    /* Output is ContentInfo instead of TimeStampResp. */
    int token_out = 0;

    if ((vpm = X509_VERIFY_PARAM_new()) == NULL)
        goto end;

    prog = opt_init(argc, argv, ts_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:
            opt_help(ts_options);
            for (helpp = opt_helplist; *helpp; ++helpp)
                BIO_printf(bio_err, "%s\n", *helpp);
            ret = 0;
            goto end;
        case OPT_CONFIG:
            configfile = opt_arg();
            break;
        case OPT_SECTION:
            section = opt_arg();
            break;
        case OPT_QUERY:
        case OPT_REPLY:
        case OPT_VERIFY:
            if (mode != OPT_ERR)
                goto opthelp;
            mode = o;
            break;
        case OPT_DATA:
            data = opt_arg();
            break;
        case OPT_DIGEST:
            digest = opt_arg();
            break;
        case OPT_RAND:
            rnd = opt_arg();
            break;
        case OPT_TSPOLICY:
            policy = opt_arg();
            break;
        case OPT_NO_NONCE:
            no_nonce = 1;
            break;
        case OPT_CERT:
            cert = 1;
            break;
        case OPT_IN:
            in = opt_arg();
            break;
        case OPT_TOKEN_IN:
            token_in = 1;
            break;
        case OPT_OUT:
            out = opt_arg();
            break;
        case OPT_TOKEN_OUT:
            token_out = 1;
            break;
        case OPT_TEXT:
            text = 1;
            break;
        case OPT_QUERYFILE:
            queryfile = opt_arg();
            break;
        case OPT_PASSIN:
            passin = opt_arg();
            break;
        case OPT_INKEY:
            inkey = opt_arg();
            break;
        case OPT_SIGNER:
            signer = opt_arg();
            break;
        case OPT_CHAIN:
            chain = opt_arg();
            break;
        case OPT_CAPATH:
            CApath = opt_arg();
            break;
        case OPT_CAFILE:
            CAfile = opt_arg();
            break;
        case OPT_UNTRUSTED:
            untrusted = opt_arg();
            break;
        case OPT_ENGINE:
            engine = opt_arg();
            break;
        case OPT_MD:
            if (!opt_md(opt_unknown(), &md))
                goto opthelp;
            break;
        case OPT_V_CASES:
            if (!opt_verify(o, vpm))
                goto end;
            vpmtouched++;
            break;
        }
    }
    argc = opt_num_rest();
    if (mode == OPT_ERR || argc != 0)
        goto opthelp;

    /* Seed the random number generator if it is going to be used. */
    if (mode == OPT_QUERY && !no_nonce) {
        if (!app_RAND_load_file(NULL, 1) && rnd == NULL)
            BIO_printf(bio_err, "warning, not much extra random "
                       "data, consider using the -rand option\n");
        if (rnd != NULL)
            BIO_printf(bio_err, "%ld semi-random bytes loaded\n",
                       app_RAND_load_files(rnd));
    }

    if (mode == OPT_REPLY && passin &&
        !app_passwd(passin, NULL, &password, NULL)) {
        BIO_printf(bio_err, "Error getting password.\n");
        goto end;
    }

    conf = load_config_file(configfile);
    if (!app_load_modules(conf))
        goto end;

    /* Check parameter consistency and execute the appropriate function. */
    switch (mode) {
    default:
    case OPT_ERR:
        goto opthelp;
    case OPT_QUERY:
        if (vpmtouched)
            goto opthelp;
        if ((data != NULL) && (digest != NULL))
            goto opthelp;
        ret = !query_command(data, digest, md, policy, no_nonce, cert,
                             in, out, text);
        break;
    case OPT_REPLY:
        if (vpmtouched)
            goto opthelp;
        if ((in != NULL) && (queryfile != NULL))
            goto opthelp;
        if (in == NULL) {
            if ((conf == NULL) || (token_in != 0))
                goto opthelp;
        }
        ret = !reply_command(conf, section, engine, queryfile,
                             password, inkey, md, signer, chain, policy,
                             in, token_in, out, token_out, text);
        break;
    case OPT_VERIFY:
        if ((in == NULL) || !EXACTLY_ONE(queryfile, data, digest))
            goto opthelp;
        ret = !verify_command(data, digest, queryfile, in, token_in,
                              CApath, CAfile, untrusted, 
                              vpmtouched ? vpm : NULL);
    }

 end:
    X509_VERIFY_PARAM_free(vpm);
    app_RAND_write_file(NULL);
    NCONF_free(conf);
    OPENSSL_free(password);
    return (ret);
}