/* passphrase.c - Passphrase callback.

   Copyright (C) 2000 Werner Koch (dd9jn)

   Copyright (C) 2001, 2002, 2003, 2004, 2005 g10 Code GmbH

   This file is part of GPGME.

   GPGME 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 2.1 of

   the License, or (at your option) any later version.

   GPGME 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, write to the Free Software

   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA

   02111-1307, USA.  */

#if HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <assert.h>

#include <errno.h>

#include "gpgme.h"

#include "context.h"

#include "ops.h"

#include "util.h"

#include "debug.h"

typedef struct

{

  int no_passphrase;

  char *uid_hint;

  char *passphrase_info;

  int bad_passphrase;

  char *maxlen;

} *op_data_t;

static void

release_op_data (void *hook)

{

  op_data_t opd = (op_data_t) hook;

  if (opd->passphrase_info)

    free (opd->passphrase_info);

  if (opd->uid_hint)

    free (opd->uid_hint);

  free (opd->maxlen);

}

gpgme_error_t

_gpgme_passphrase_status_handler (void *priv, gpgme_status_code_t code,

				  char *args)

{

  gpgme_ctx_t ctx = (gpgme_ctx_t) priv;

  gpgme_error_t err;

  void *hook;

  op_data_t opd;

  err = _gpgme_op_data_lookup (ctx, OPDATA_PASSPHRASE, &hook,

			       sizeof (*opd), release_op_data);

  opd = hook;

  if (err)

    return err;

  switch (code)

    {

    case GPGME_STATUS_INQUIRE_MAXLEN:

      free (opd->maxlen);

      if (!(opd->maxlen = strdup (args)))

        return gpg_error_from_syserror ();

      break;

    case GPGME_STATUS_USERID_HINT:

      if (opd->uid_hint)

	free (opd->uid_hint);

      if (!(opd->uid_hint = strdup (args)))

        return gpg_error_from_syserror ();

      break;

    case GPGME_STATUS_BAD_PASSPHRASE:

      opd->bad_passphrase++;

      opd->no_passphrase = 0;

      break;

    case GPGME_STATUS_GOOD_PASSPHRASE:

      opd->bad_passphrase = 0;

      opd->no_passphrase = 0;

      break;

    case GPGME_STATUS_NEED_PASSPHRASE:

    case GPGME_STATUS_NEED_PASSPHRASE_SYM:

    case GPGME_STATUS_NEED_PASSPHRASE_PIN:

      if (opd->passphrase_info)

	free (opd->passphrase_info);

      opd->passphrase_info = strdup (args);

      if (!opd->passphrase_info)

	return gpg_error_from_syserror ();

      break;

    case GPGME_STATUS_MISSING_PASSPHRASE:

      opd->no_passphrase = 1;

      break;

    case GPGME_STATUS_EOF:

      if (opd->no_passphrase || opd->bad_passphrase)

	return gpg_error (GPG_ERR_BAD_PASSPHRASE);

      break;

    case GPGME_STATUS_ERROR:

      /* We abuse this status handler to forward ERROR status codes to

         the caller.  */

      if (ctx->status_cb && !ctx->full_status)

        {

          err = ctx->status_cb (ctx->status_cb_value, "ERROR", args);

          if (err)

            return err;

        }

      break;

    case GPGME_STATUS_FAILURE:

      /* We abuse this status handler to forward FAILURE status codes

         to the caller.  */

      if (ctx->status_cb && !ctx->full_status)

        {

          err = ctx->status_cb (ctx->status_cb_value, "FAILURE", args);

          if (err)

            return err;

        }

      break;

    default:

      /* Ignore all other codes.  */

      break;

    }

  return 0;

}

gpgme_error_t

_gpgme_passphrase_command_handler (void *priv, gpgme_status_code_t code,

				   const char *key, int fd, int *processed)

{

  gpgme_ctx_t ctx = (gpgme_ctx_t) priv;

  gpgme_error_t err;

  void *hook;

  op_data_t opd;

  assert (ctx->passphrase_cb);

  err = _gpgme_op_data_lookup (ctx, OPDATA_PASSPHRASE, &hook,

			       sizeof (*opd), release_op_data);

  opd = hook;

  if (err)

    return err;

  if (code == GPGME_STATUS_GET_HIDDEN

      && (!strcmp (key, "passphrase.enter")

          || !strcmp (key, "passphrase.pin.ask")))

    {

      if (processed)

	*processed = 1;

      /* Fake a status line to to convey the MAXLEN info.  */

      if (ctx->status_cb && opd->maxlen)

        err = ctx->status_cb (ctx->status_cb_value, "INQUIRE_MAXLEN",

                              opd->maxlen);

      if (!err)

        err = ctx->passphrase_cb (ctx->passphrase_cb_value,

                                  opd->uid_hint, opd->passphrase_info,

                                  opd->bad_passphrase, fd);

      /* Reset bad passphrase flag, in case it is correct now.  */

      opd->bad_passphrase = 0;

      return err;

    }

  return 0;

}