/*
 * Copyright (C) 2012 Free Software Foundation
 *
 * Author: Nikos Mavrogiannopoulos
 *
 * This file is part of libdane.
 *
 * libdane is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 3 of
 * the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>
 *
 */

#include <config.h>
#include <gnutls/dane.h>

/* I18n of error codes. */
#include "gettext.h"
#define _(String) dgettext (PACKAGE, String)
#define N_(String) gettext_noop (String)

#define ERROR_ENTRY(desc, name) \
	{ desc, #name, name}

struct error_entry
{
  const char *desc;
  const char *_name;
  int number;
};
typedef struct error_entry error_entry;

static const error_entry error_algorithms[] = {
  ERROR_ENTRY (N_("Success."), DANE_E_SUCCESS),
  ERROR_ENTRY (N_("There was error initializing the DNS query."),
               DANE_E_INITIALIZATION_ERROR),
  ERROR_ENTRY (N_("There was an error while resolving."),
               DANE_E_RESOLVING_ERROR),
  ERROR_ENTRY (N_("No DANE data were found."),
               DANE_E_NO_DANE_DATA),
  ERROR_ENTRY (N_("Unknown DANE data were found."),
               DANE_E_UNKNOWN_DANE_DATA),
  ERROR_ENTRY (N_("No DNSSEC signature was found."),
               DANE_E_NO_DNSSEC_SIG),
  ERROR_ENTRY (N_("Received corrupt data."),
               DANE_E_RECEIVED_CORRUPT_DATA),
  ERROR_ENTRY (N_("The DNSSEC signature is invalid."),
               DANE_E_INVALID_DNSSEC_SIG),
  ERROR_ENTRY (N_("There was a memory error."),
               DANE_E_MEMORY_ERROR),
  ERROR_ENTRY (N_("There requested data are not available."),
               DANE_E_REQUESTED_DATA_NOT_AVAILABLE),
  ERROR_ENTRY (N_("There request is invalid."),
               DANE_E_INVALID_REQUEST),
  ERROR_ENTRY (N_("There was an error in the certificate."),
               DANE_E_CERT_ERROR),
  ERROR_ENTRY (N_("There was an error in the public key."),
               DANE_E_PUBKEY_ERROR),
  ERROR_ENTRY (N_("No certificate was found."),
               DANE_E_NO_CERT),
  ERROR_ENTRY (N_("Error in file."),
               DANE_E_FILE_ERROR),
  {NULL, NULL, 0}
};

/**
 * dane_strerror:
 * @error: is a DANE error code, a negative error code
 *
 * This function is similar to strerror.  The difference is that it
 * accepts an error number returned by a gnutls function; In case of
 * an unknown error a descriptive string is sent instead of %NULL.
 *
 * Error codes are always a negative error code.
 *
 * Returns: A string explaining the DANE error message.
 **/
const char *
dane_strerror (int error)
{
  const char *ret = NULL;
  const error_entry *p;

  for (p = error_algorithms; p->desc != NULL; p++)
    {
      if (p->number == error)
        {
          ret = p->desc;
          break;
        }
    }

  /* avoid prefix */
  if (ret == NULL)
    return _("(unknown error code)");

  return _(ret);
}