/* gpgme.c - GnuPG Made Easy.

   Copyright (C) 2000 Werner Koch (dd9jn)

   Copyright (C) 2001, 2002, 2003, 2004, 2005, 2007, 2012,

                 2014, 2015 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, see <https://www.gnu.org/licenses/>.

 */

#if HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <assert.h>

#include <errno.h>

#ifdef HAVE_LOCALE_H

#include <locale.h>

#endif

#include "util.h"

#include "context.h"

#include "ops.h"

#include "wait.h"

#include "debug.h"

#include "priv-io.h"

#include "sys-util.h"

#include "mbox-util.h"

/* The default locale.  */

DEFINE_STATIC_LOCK (def_lc_lock);

static char *def_lc_ctype;

static char *def_lc_messages;

gpgme_error_t _gpgme_selftest = GPG_ERR_NOT_OPERATIONAL;

/* Protects all reference counters in result structures.  All other

   accesses to a result structure are read only.  */

DEFINE_STATIC_LOCK (result_ref_lock);

/* Set the global flag NAME to VALUE.  Return 0 on success.  Note that

   this function does not use gpgme_error and thus a non-zero return

   value merely means "error".  Certain flags may be set before

   gpgme_check_version is called.  See the manual for a description of

   supported flags.  The caller must assure that this function is

   called only by one thread at a time.  */

int

gpgme_set_global_flag (const char *name, const char *value)

{

  if (!name || !value)

    return -1;

  else if (!strcmp (name, "debug"))

    return _gpgme_debug_set_debug_envvar (value);

  else if (!strcmp (name, "disable-gpgconf"))

    {

      _gpgme_dirinfo_disable_gpgconf ();

      return 0;

    }

  else if (!strcmp (name, "require-gnupg"))

    return _gpgme_set_engine_minimal_version (value);

  else if (!strcmp (name, "gpgconf-name"))

    return _gpgme_set_default_gpgconf_name (value);

  else if (!strcmp (name, "gpg-name"))

    return _gpgme_set_default_gpg_name (value);

  else if (!strcmp (name, "w32-inst-dir"))

    return _gpgme_set_override_inst_dir (value);

  else

    return -1;

}

/* Create a new context as an environment for GPGME crypto

   operations.  */

gpgme_error_t

gpgme_new (gpgme_ctx_t *r_ctx)

{

  gpgme_error_t err;

  gpgme_ctx_t ctx;

  TRACE_BEG (DEBUG_CTX, "gpgme_new", r_ctx);

  if (_gpgme_selftest)

    return TRACE_ERR (_gpgme_selftest);

  if (!r_ctx)

    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  ctx = calloc (1, sizeof *ctx);

  if (!ctx)

    return TRACE_ERR (gpg_error_from_syserror ());

  INIT_LOCK (ctx->lock);

  err = _gpgme_engine_info_copy (&ctx->engine_info);

  if (!err && !ctx->engine_info)

    err = gpg_error (GPG_ERR_NO_ENGINE);

  if (err)

    {

      free (ctx);

      return TRACE_ERR (err);

    }

  ctx->keylist_mode = GPGME_KEYLIST_MODE_LOCAL;

  ctx->include_certs = GPGME_INCLUDE_CERTS_DEFAULT;

  ctx->protocol = GPGME_PROTOCOL_OpenPGP;

  ctx->sub_protocol = GPGME_PROTOCOL_DEFAULT;

  _gpgme_fd_table_init (&ctx->fdt);

  LOCK (def_lc_lock);

  if (def_lc_ctype)

    {

      ctx->lc_ctype = strdup (def_lc_ctype);

      if (!ctx->lc_ctype)

	{

          int saved_err = gpg_error_from_syserror ();

	  UNLOCK (def_lc_lock);

	  _gpgme_engine_info_release (ctx->engine_info);

	  free (ctx);

	  return TRACE_ERR (saved_err);

	}

    }

  else

    def_lc_ctype = NULL;

  if (def_lc_messages)

    {

      ctx->lc_messages = strdup (def_lc_messages);

      if (!ctx->lc_messages)

	{

          int saved_err = gpg_error_from_syserror ();

	  UNLOCK (def_lc_lock);

	  if (ctx->lc_ctype)

	    free (ctx->lc_ctype);

	  _gpgme_engine_info_release (ctx->engine_info);

	  free (ctx);

	  return TRACE_ERR (saved_err);

	}

    }

  else

    def_lc_messages = NULL;

  UNLOCK (def_lc_lock);

  *r_ctx = ctx;

  return TRACE_SUC1 ("ctx=%p", ctx);

}

gpgme_error_t

_gpgme_cancel_with_err (gpgme_ctx_t ctx, gpg_error_t ctx_err,

			gpg_error_t op_err)

{

  gpgme_error_t err;

  struct gpgme_io_event_done_data data;

  TRACE_BEG2 (DEBUG_CTX, "_gpgme_cancel_with_err", ctx, "ctx_err=%i, op_err=%i",

	      ctx_err, op_err);

  if (ctx_err)

    {

      err = _gpgme_engine_cancel (ctx->engine);

      if (err)

	return TRACE_ERR (err);

    }

  else

    {

      err = _gpgme_engine_cancel_op (ctx->engine);

      if (err)

	return TRACE_ERR (err);

    }

  data.err = ctx_err;

  data.op_err = op_err;

  _gpgme_engine_io_event (ctx->engine, GPGME_EVENT_DONE, &data);

  return TRACE_ERR (0);

}

/* Cancel a pending asynchronous operation.  */

gpgme_error_t

gpgme_cancel (gpgme_ctx_t ctx)

{

  gpg_error_t err;

  TRACE_BEG (DEBUG_CTX, "gpgme_cancel", ctx);

  if (!ctx)

    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  err = _gpgme_cancel_with_err (ctx, gpg_error (GPG_ERR_CANCELED), 0);

  return TRACE_ERR (err);

}

/* Cancel a pending operation asynchronously.  */

gpgme_error_t

gpgme_cancel_async (gpgme_ctx_t ctx)

{

  TRACE_BEG (DEBUG_CTX, "gpgme_cancel_async", ctx);

  if (!ctx)

    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  LOCK (ctx->lock);

  ctx->canceled = 1;

  UNLOCK (ctx->lock);

  return TRACE_ERR (0);

}

/* Release all resources associated with the given context.  */

void

gpgme_release (gpgme_ctx_t ctx)

{

  TRACE (DEBUG_CTX, "gpgme_release", ctx);

  if (!ctx)

    return;

  _gpgme_engine_release (ctx->engine);

  ctx->engine = NULL;

  _gpgme_fd_table_deinit (&ctx->fdt);

  _gpgme_release_result (ctx);

  _gpgme_signers_clear (ctx);

  _gpgme_sig_notation_clear (ctx);

  free (ctx->sender);

  free (ctx->signers);

  free (ctx->lc_ctype);

  free (ctx->lc_messages);

  free (ctx->override_session_key);

  _gpgme_engine_info_release (ctx->engine_info);

  ctx->engine_info = NULL;

  DESTROY_LOCK (ctx->lock);

  free (ctx);

}

void

gpgme_result_ref (void *result)

{

  struct ctx_op_data *data;

  if (! result)

    return;

  data = (void*)((char*)result - sizeof (struct ctx_op_data));

  assert (data->magic == CTX_OP_DATA_MAGIC);

  LOCK (result_ref_lock);

  data->references++;

  UNLOCK (result_ref_lock);

}

void

gpgme_result_unref (void *result)

{

  struct ctx_op_data *data;

  if (! result)

    return;

  data = (void*)((char*)result - sizeof (struct ctx_op_data));

  assert (data->magic == CTX_OP_DATA_MAGIC);

  LOCK (result_ref_lock);

  if (--data->references)

    {

      UNLOCK (result_ref_lock);

      return;

    }

  UNLOCK (result_ref_lock);

  if (data->cleanup)

    (*data->cleanup) (data->hook);

  free (data);

}

void

_gpgme_release_result (gpgme_ctx_t ctx)

{

  struct ctx_op_data *data = ctx->op_data;

  while (data)

    {

      struct ctx_op_data *next_data = data->next;

      data->next = NULL;

      gpgme_result_unref (data->hook);

      data = next_data;

    }

  ctx->op_data = NULL;

}

gpgme_error_t

gpgme_set_protocol (gpgme_ctx_t ctx, gpgme_protocol_t protocol)

{

  TRACE_BEG2 (DEBUG_CTX, "gpgme_set_protocol", ctx, "protocol=%i (%s)",

	      protocol, gpgme_get_protocol_name (protocol)

	      ? gpgme_get_protocol_name (protocol) : "invalid");

  if (protocol != GPGME_PROTOCOL_OpenPGP

      && protocol != GPGME_PROTOCOL_CMS

      && protocol != GPGME_PROTOCOL_GPGCONF

      && protocol != GPGME_PROTOCOL_ASSUAN

      && protocol != GPGME_PROTOCOL_G13

      && protocol != GPGME_PROTOCOL_UISERVER

      && protocol != GPGME_PROTOCOL_SPAWN)

    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  if (!ctx)

    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  if (ctx->protocol != protocol)

    {

      /* Shut down the engine when switching protocols.  */

      if (ctx->engine)

	{

	  TRACE_LOG1 ("releasing ctx->engine=%p", ctx->engine);

	  _gpgme_engine_release (ctx->engine);

	  ctx->engine = NULL;

	}

      ctx->protocol = protocol;

    }

  return TRACE_ERR (0);

}

gpgme_protocol_t

gpgme_get_protocol (gpgme_ctx_t ctx)

{

  TRACE2 (DEBUG_CTX, "gpgme_get_protocol", ctx,

	  "ctx->protocol=%i (%s)", ctx->protocol,

	  gpgme_get_protocol_name (ctx->protocol)

	  ? gpgme_get_protocol_name (ctx->protocol) : "invalid");

  return ctx->protocol;

}

gpgme_error_t

gpgme_set_sub_protocol (gpgme_ctx_t ctx, gpgme_protocol_t protocol)

{

  TRACE2 (DEBUG_CTX, "gpgme_set_sub_protocol", ctx, "protocol=%i (%s)",

	  protocol, gpgme_get_protocol_name (protocol)

	  ? gpgme_get_protocol_name (protocol) : "invalid");

  if (!ctx)

    return gpg_error (GPG_ERR_INV_VALUE);

  ctx->sub_protocol = protocol;

  return 0;

}

gpgme_protocol_t

gpgme_get_sub_protocol (gpgme_ctx_t ctx)

{

  TRACE2 (DEBUG_CTX, "gpgme_get_sub_protocol", ctx,

	  "ctx->sub_protocol=%i (%s)", ctx->sub_protocol,

	  gpgme_get_protocol_name (ctx->sub_protocol)

	  ? gpgme_get_protocol_name (ctx->sub_protocol) : "invalid");

  return ctx->sub_protocol;

}

const char *

gpgme_get_protocol_name (gpgme_protocol_t protocol)

{

  switch (protocol)

    {

    case GPGME_PROTOCOL_OpenPGP:

      return "OpenPGP";

    case GPGME_PROTOCOL_CMS:

      return "CMS";

    case GPGME_PROTOCOL_GPGCONF:

      return "GPGCONF";

    case GPGME_PROTOCOL_ASSUAN:

      return "Assuan";

    case GPGME_PROTOCOL_G13:

      return "G13";

    case GPGME_PROTOCOL_UISERVER:

      return "UIServer";

    case GPGME_PROTOCOL_SPAWN:

      return "Spawn";

    case GPGME_PROTOCOL_DEFAULT:

      return "default";

    case GPGME_PROTOCOL_UNKNOWN:

      return "unknown";

    default:

      return NULL;

    }

}

/* Store the sender's address in the context.  ADDRESS is addr-spec of

 * mailbox but my also be a complete mailbox, in which case this

 * function extracts the addr-spec from it.  Returns 0 on success or

 * an error code if no valid addr-spec could be extracted from

 * ADDRESS.  */

gpgme_error_t

gpgme_set_sender (gpgme_ctx_t ctx, const char *address)

{

  char *p = NULL;

  TRACE_BEG1 (DEBUG_CTX, "gpgme_set_sender", ctx, "sender='%s'",

              address?address:"(null)");

  if (!ctx || (address && !(p = _gpgme_mailbox_from_userid (address))))

    return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));

  free (ctx->sender);

  ctx->sender = p;

  return TRACE_ERR (0);

}

/* Return the sender's address (addr-spec part) from the context or

 * NULL if none was set.  The returned value is valid as long as the

 * CTX is valid and gpgme_set_sender has not been used.  */

const char *

gpgme_get_sender (gpgme_ctx_t ctx)

{

  TRACE1 (DEBUG_CTX, "gpgme_get_sender", ctx, "sender='%s'",

          ctx?ctx->sender:"");

  return ctx->sender;

}

/* Enable or disable the use of an ascii armor for all output.  */

void

gpgme_set_armor (gpgme_ctx_t ctx, int use_armor)

{

  TRACE2 (DEBUG_CTX, "gpgme_set_armor", ctx, "use_armor=%i (%s)",

	  use_armor, use_armor ? "yes" : "no");

  if (!ctx)

    return;

  ctx->use_armor = !!use_armor;

}

/* Return the state of the armor flag.  */

int

gpgme_get_armor (gpgme_ctx_t ctx)

{

  TRACE2 (DEBUG_CTX, "gpgme_get_armor", ctx, "ctx->use_armor=%i (%s)",

	  ctx->use_armor, ctx->use_armor ? "yes" : "no");

  return ctx->use_armor;

}

/* Set the flag NAME for CTX to VALUE.  The supported flags are:

 *

 * - full-status :: With a value of "1" the status callback set by

 *                  gpgme_set_status_cb returns all status lines

 *                  except for PROGRESS lines.  With the default of

 *                  "0" the status callback is only called in certain

 *                  situations.

 */

gpgme_error_t

gpgme_set_ctx_flag (gpgme_ctx_t ctx, const char *name, const char *value)

{

  gpgme_error_t err = 0;

  int abool;

  TRACE2 (DEBUG_CTX, "gpgme_set_ctx_flag", ctx,

          "name='%s' value='%s'",

	  name? name:"(null)", value?value:"(null)");

  abool = (value && *value)? !!atoi (value) : 0;

  if (!ctx || !name || !value)

    err = gpg_error (GPG_ERR_INV_VALUE);

  else if (!strcmp (name, "redraw"))

    {

      ctx->redraw_suggested = abool;

    }

  else if (!strcmp (name, "full-status"))

    {

      ctx->full_status = abool;

    }

  else if (!strcmp (name, "raw-description"))

    {

      ctx->raw_description = abool;

    }

  else if (!strcmp (name, "export-session-key"))

    {

      ctx->export_session_keys = abool;

    }

  else if (!strcmp (name, "override-session-key"))

    {

      free (ctx->override_session_key);

      ctx->override_session_key = strdup (value);

      if (!ctx->override_session_key)

        err = gpg_error_from_syserror ();

    }

  else if (!strcmp (name, "auto-key-retrieve"))

    {

      ctx->auto_key_retrieve = abool;

    }

  else

    err = gpg_error (GPG_ERR_UNKNOWN_NAME);

  return err;

}

/* Get the context flag named NAME.  See gpgme_set_ctx_flag for a list

 * of valid names.  If the NAME is unknown NULL is returned.  For a

 * boolean flag an empty string is returned for False and the string

 * "1" for True; thus either atoi or a simple string test can be

 * used.  */

const char *

gpgme_get_ctx_flag (gpgme_ctx_t ctx, const char *name)

{

  if (!ctx || !name)

    return NULL;

  else if (!strcmp (name, "redraw"))

    {

      return ctx->redraw_suggested? "1":"";

    }

  else if (!strcmp (name, "full-status"))

    {

      return ctx->full_status? "1":"";

    }

  else if (!strcmp (name, "raw-description"))

    {

      return ctx->raw_description? "1":"";

    }

  else if (!strcmp (name, "export-session-key"))

    {

      return ctx->export_session_keys? "1":"";

    }

  else if (!strcmp (name, "override-session-key"))

    {

      return ctx->override_session_key? ctx->override_session_key : "";

    }

  else if (!strcmp (name, "auto-key-retrieve"))

    {

      return ctx->auto_key_retrieve? "1":"";

    }

  else

    return NULL;

}

/* Enable or disable the use of the special textmode.  Textmode is for

  example used for the RFC2015 signatures; note that the updated RFC

  3156 mandates that the MUA does some preparations so that textmode

  is not needed anymore.  */

void

gpgme_set_textmode (gpgme_ctx_t ctx, int use_textmode)

{

  TRACE2 (DEBUG_CTX, "gpgme_set_textmode", ctx, "use_textmode=%i (%s)",

	  use_textmode, use_textmode ? "yes" : "no");

  if (!ctx)

    return;

  ctx->use_textmode = !!use_textmode;

}

/* Return the state of the textmode flag.  */

int

gpgme_get_textmode (gpgme_ctx_t ctx)

{

  TRACE2 (DEBUG_CTX, "gpgme_get_textmode", ctx, "ctx->use_textmode=%i (%s)",

	  ctx->use_textmode, ctx->use_textmode ? "yes" : "no");

  return ctx->use_textmode;

}

/* Enable offline mode for this context. In offline mode dirmngr

  will be disabled. */

void

gpgme_set_offline (gpgme_ctx_t ctx, int offline)

{

  TRACE2 (DEBUG_CTX, "gpgme_set_offline", ctx, "offline=%i (%s)",

          offline, offline ? "yes" : "no");

  if (!ctx)

    return;

  ctx->offline = !!offline;

}

/* Return the state of the offline flag.  */

int

gpgme_get_offline (gpgme_ctx_t ctx)

{

  TRACE2 (DEBUG_CTX, "gpgme_get_offline", ctx, "ctx->offline=%i (%s)",

          ctx->offline, ctx->offline ? "yes" : "no");

  return ctx->offline;

}

/* Set the number of certifications to include in an S/MIME message.

   The default is GPGME_INCLUDE_CERTS_DEFAULT.  -1 means all certs,

   and -2 means all certs except the root cert.  */

void

gpgme_set_include_certs (gpgme_ctx_t ctx, int nr_of_certs)

{

  if (!ctx)

    return;

  if (nr_of_certs == GPGME_INCLUDE_CERTS_DEFAULT)

    ctx->include_certs = GPGME_INCLUDE_CERTS_DEFAULT;

  else if (nr_of_certs < -2)

    ctx->include_certs = -2;

  else

    ctx->include_certs = nr_of_certs;

  TRACE2 (DEBUG_CTX, "gpgme_set_include_certs", ctx, "nr_of_certs=%i%s",

	  nr_of_certs, nr_of_certs == ctx->include_certs ? "" : " (-2)");

}

/* Get the number of certifications to include in an S/MIME

   message.  */

int

gpgme_get_include_certs (gpgme_ctx_t ctx)

{

  TRACE1 (DEBUG_CTX, "gpgme_get_include_certs", ctx, "ctx->include_certs=%i",

	  ctx->include_certs);

  return ctx->include_certs;

}

/* This function changes the default behaviour of the keylisting

   functions.  MODE is a bitwise-OR of the GPGME_KEYLIST_* flags.  The

   default mode is GPGME_KEYLIST_MODE_LOCAL.  */

gpgme_error_t

gpgme_set_keylist_mode (gpgme_ctx_t ctx, gpgme_keylist_mode_t mode)

{

  TRACE1 (DEBUG_CTX, "gpgme_set_keylist_mode", ctx, "keylist_mode=0x%x",

	  mode);

  if (!ctx)

    return gpg_error (GPG_ERR_INV_VALUE);

  ctx->keylist_mode = mode;

  return 0;

}

/* This function returns the default behaviour of the keylisting

   functions.  */

gpgme_keylist_mode_t

gpgme_get_keylist_mode (gpgme_ctx_t ctx)

{

  TRACE1 (DEBUG_CTX, "gpgme_get_keylist_mode", ctx,

	  "ctx->keylist_mode=0x%x", ctx->keylist_mode);

  return ctx->keylist_mode;

}

/* Set the pinentry mode for CTX to MODE. */

gpgme_error_t

gpgme_set_pinentry_mode (gpgme_ctx_t ctx, gpgme_pinentry_mode_t mode)

{

  TRACE1 (DEBUG_CTX, "gpgme_set_pinentry_mode", ctx, "pinentry_mode=%u",

	  (unsigned int)mode);

  if (!ctx)

    return gpg_error (GPG_ERR_INV_VALUE);

  switch (mode)

    {

    case GPGME_PINENTRY_MODE_DEFAULT:

    case GPGME_PINENTRY_MODE_ASK:

    case GPGME_PINENTRY_MODE_CANCEL:

    case GPGME_PINENTRY_MODE_ERROR:

    case GPGME_PINENTRY_MODE_LOOPBACK:

      break;

    default:

      return gpg_error (GPG_ERR_INV_VALUE);

    }

  ctx->pinentry_mode = mode;

  return 0;

}

/* Get the pinentry mode of CTX.  */

gpgme_pinentry_mode_t

gpgme_get_pinentry_mode (gpgme_ctx_t ctx)

{

  TRACE1 (DEBUG_CTX, "gpgme_get_pinentry_mode", ctx,

	  "ctx->pinentry_mode=%u", (unsigned int)ctx->pinentry_mode);

  return ctx->pinentry_mode;

}

/* This function sets a callback function to be used to pass a

   passphrase to gpg.  */

void

gpgme_set_passphrase_cb (gpgme_ctx_t ctx, gpgme_passphrase_cb_t cb,

			 void *cb_value)

{

  TRACE2 (DEBUG_CTX, "gpgme_set_passphrase_cb", ctx,

	  "passphrase_cb=%p/%p", cb, cb_value);

  if (!ctx)

    return;

  ctx->passphrase_cb = cb;

  ctx->passphrase_cb_value = cb_value;

}

/* This function returns the callback function to be used to pass a

   passphrase to the crypto engine.  */

void

gpgme_get_passphrase_cb (gpgme_ctx_t ctx, gpgme_passphrase_cb_t *r_cb,

			 void **r_cb_value)

{

  TRACE2 (DEBUG_CTX, "gpgme_get_passphrase_cb", ctx,

	  "ctx->passphrase_cb=%p/%p",

	  ctx->passphrase_cb, ctx->passphrase_cb_value);

  if (r_cb)

    *r_cb = ctx->passphrase_cb;

  if (r_cb_value)

    *r_cb_value = ctx->passphrase_cb_value;

}

/* This function sets a callback function to be used as a progress

   indicator.  */

void

gpgme_set_progress_cb (gpgme_ctx_t ctx, gpgme_progress_cb_t cb, void *cb_value)

{

  TRACE2 (DEBUG_CTX, "gpgme_set_progress_cb", ctx, "progress_cb=%p/%p",

	  cb, cb_value);

  if (!ctx)

    return;

  ctx->progress_cb = cb;

  ctx->progress_cb_value = cb_value;

}

/* This function returns the callback function to be used as a

   progress indicator.  */

void

gpgme_get_progress_cb (gpgme_ctx_t ctx, gpgme_progress_cb_t *r_cb,

		       void **r_cb_value)

{

  TRACE2 (DEBUG_CTX, "gpgme_get_progress_cb", ctx, "ctx->progress_cb=%p/%p",

	  ctx->progress_cb, ctx->progress_cb_value);

  if (r_cb)

    *r_cb = ctx->progress_cb;

  if (r_cb_value)

    *r_cb_value = ctx->progress_cb_value;

}

/* This function sets a callback function to be used as a status

   message forwarder.  */

void

gpgme_set_status_cb (gpgme_ctx_t ctx, gpgme_status_cb_t cb, void *cb_value)

{

  TRACE2 (DEBUG_CTX, "gpgme_set_status_cb", ctx, "status_cb=%p/%p",

	  cb, cb_value);

  if (!ctx)

    return;

  ctx->status_cb = cb;

  ctx->status_cb_value = cb_value;

}

/* This function returns the callback function to be used as a

   status message forwarder.  */

void

gpgme_get_status_cb (gpgme_ctx_t ctx, gpgme_status_cb_t *r_cb,

		       void **r_cb_value)

{

  TRACE2 (DEBUG_CTX, "gpgme_get_status_cb", ctx, "ctx->status_cb=%p/%p",

	  ctx ? ctx->status_cb : NULL, ctx ? ctx->status_cb_value : NULL);

  if (r_cb)

    *r_cb = NULL;

  if (r_cb_value)

    *r_cb_value = NULL;

  if (!ctx || !ctx->status_cb)

    return;

  if (r_cb)

    *r_cb = ctx->status_cb;

  if (r_cb_value)

    *r_cb_value = ctx->status_cb_value;

}

/* Set the I/O callback functions for CTX to IO_CBS.  */

void

gpgme_set_io_cbs (gpgme_ctx_t ctx, gpgme_io_cbs_t io_cbs)

{

  if (!ctx)

    return;

  if (io_cbs)

    {

      TRACE6 (DEBUG_CTX, "gpgme_set_io_cbs", ctx,

	      "io_cbs=%p (add=%p/%p, remove=%p, event=%p/%p",

	      io_cbs, io_cbs->add, io_cbs->add_priv, io_cbs->remove,

	      io_cbs->event, io_cbs->event_priv);

      ctx->io_cbs = *io_cbs;

    }

  else

    {

      TRACE1 (DEBUG_CTX, "gpgme_set_io_cbs", ctx,

	      "io_cbs=%p (default)", io_cbs);

      ctx->io_cbs.add = NULL;

      ctx->io_cbs.add_priv = NULL;

      ctx->io_cbs.remove = NULL;

      ctx->io_cbs.event = NULL;

      ctx->io_cbs.event_priv = NULL;

    }

}

/* This function provides access to the internal read function; it is

   normally not used.  */

gpgme_ssize_t

gpgme_io_read (int fd, void *buffer, size_t count)

{

  int ret;

  TRACE_BEG2 (DEBUG_GLOBAL, "gpgme_io_read", fd,

	      "buffer=%p, count=%u", buffer, count);

  ret = _gpgme_io_read (fd, buffer, count);

  return TRACE_SYSRES (ret);

}

/* This function provides access to the internal write function.  It

   is to be used by user callbacks to return data to gpgme.  See

   gpgme_passphrase_cb_t and gpgme_edit_cb_t.  */