gpgme/trunk/gpgme/encrypt.c

/* encrypt.c -  encrypt functions
 *	Copyright (C) 2000 Werner Koch (dd9jn)
 *      Copyright (C) 2001, 2002 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 General Public License as published by
 * the Free Software Foundation; either version 2 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 General Public License for more details.
 *
 * You should have received a copy of the GNU 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
 */

#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>

#include "util.h"
#include "context.h"
#include "ops.h"
#include "wait.h"

#define SKIP_TOKEN_OR_RETURN(a) do { \
    while (*(a) && *(a) != ' ') (a)++; \
    while (*(a) == ' ') (a)++; \
    if (!*(a)) \
        return; /* oops */ \
} while (0)

struct encrypt_result_s
{
  int no_valid_recipients;
  int invalid_recipients;
  GpgmeData xmlinfo;
};

void
_gpgme_release_encrypt_result (EncryptResult result)
{
  if (!result)
    return;
  gpgme_data_release (result->xmlinfo);
  xfree (result);
}

/* 
 * Parse the args and save the information 
 * in an XML structure.
 * With args of NULL the xml structure is closed.
 */
static void
append_xml_encinfo (GpgmeData *rdh, char *args)
{
  GpgmeData dh;
  char helpbuf[100];

  if (!*rdh)
    {
      if (gpgme_data_new (rdh))
	return; /* FIXME: We are ignoring out-of-core.  */
      dh = *rdh;
      _gpgme_data_append_string (dh, "<GnupgOperationInfo>\n");
    }
  else
    {
      dh = *rdh;
      _gpgme_data_append_string (dh, "  </encryption>\n");
    }

  if (!args)
    {
      /* Just close the XML containter.  */
      _gpgme_data_append_string (dh, "</GnupgOperationInfo>\n");
      return;
    }

  _gpgme_data_append_string (dh, "  <encryption>\n"
			     "    <error>\n"
			     "      <invalidRecipient/>\n");
    
  sprintf (helpbuf, "      <reason>%d</reason>\n", atoi (args));
  _gpgme_data_append_string (dh, helpbuf);
  SKIP_TOKEN_OR_RETURN (args);

  _gpgme_data_append_string (dh, "      <name>");
  _gpgme_data_append_percentstring_for_xml (dh, args);
  _gpgme_data_append_string (dh, "</name>\n"
			     "    </error>\n");
}


static void
status_handler_finish (GpgmeCtx ctx)
{
  if (ctx->result.encrypt->xmlinfo)
    {
      append_xml_encinfo (&ctx->result.encrypt->xmlinfo, NULL);
      _gpgme_set_op_info (ctx, ctx->result.encrypt->xmlinfo);
      ctx->result.encrypt->xmlinfo = NULL;
    }
  if (ctx->error)
    ; /* already set by kludge in engine-gpgsm */
  else if (ctx->result.encrypt->no_valid_recipients) 
    ctx->error = mk_error (No_Recipients);
  else if (ctx->result.encrypt->invalid_recipients) 
    ctx->error = mk_error (Invalid_Recipients);
}

void
_gpgme_encrypt_status_handler (GpgmeCtx ctx, GpgmeStatusCode code, char *args)
{
  if (ctx->error)
    {
      if (ctx->result.encrypt) /* check that we have allocated it. */
        status_handler_finish (ctx);
      return;
    }
  test_and_allocate_result (ctx, encrypt);

  switch (code)
    {
    case GPGME_STATUS_EOF:
      status_handler_finish (ctx);
      break;

    case GPGME_STATUS_INV_RECP:
      ctx->result.encrypt->invalid_recipients++;
      append_xml_encinfo (&ctx->result.encrypt->xmlinfo, args);
      break;

    case GPGME_STATUS_NO_RECP:
      ctx->result.encrypt->no_valid_recipients = 1;
      break;

    default:
      break;
    }
}


void
_gpgme_encrypt_sym_status_handler (GpgmeCtx ctx, GpgmeStatusCode code, char *args)
{
  _gpgme_passphrase_status_handler (ctx, code, args);
}


static GpgmeError
_gpgme_op_encrypt_start (GpgmeCtx ctx, int synchronous,
			 GpgmeRecipients recp, GpgmeData plain, GpgmeData ciph)
{
  GpgmeError err = 0;
  int symmetric = 0;

  /* Do some checks.  */
  if (!recp)
    symmetric = 1;
  else if (!gpgme_recipients_count (recp))
    {
      err = mk_error (No_Recipients);
      goto leave;
    }

  err = _gpgme_op_reset (ctx, synchronous);
  if (err)
    goto leave;

  if (symmetric)
    {
      err = _gpgme_passphrase_start (ctx);
      if (err)
	goto leave;
    }

  _gpgme_engine_set_status_handler (ctx->engine,
				    symmetric
				    ? _gpgme_encrypt_sym_status_handler
				    : _gpgme_encrypt_status_handler,
				    ctx);
  _gpgme_engine_set_verbosity (ctx->engine, ctx->verbosity);

  /* Check the supplied data */
  if (!plain)
    {
      err = mk_error (No_Data);
      goto leave;
    }
  if (!ciph)
    {
      err = mk_error (Invalid_Value);
      goto leave;
    }

  err = _gpgme_engine_op_encrypt (ctx->engine, recp, plain, ciph, ctx->use_armor);


  if (!err)	/* And kick off the process.  */
    err = _gpgme_engine_start (ctx->engine, ctx);

 leave:
  if (err)
    {
      ctx->pending = 0; 
      _gpgme_engine_release (ctx->engine);
      ctx->engine = NULL;
    }
  return err;
}


GpgmeError
gpgme_op_encrypt_start (GpgmeCtx ctx, GpgmeRecipients recp, GpgmeData plain,
			GpgmeData ciph)
{
  return _gpgme_op_encrypt_start (ctx, 0, recp, plain, ciph);
}


/**
 * gpgme_op_encrypt:
 * @c: The context
 * @recp: A set of recipients 
 * @in: plaintext input
 * @out: ciphertext output
 * 
 * This function encrypts @in to @out for all recipients from
 * @recp.  Other parameters are take from the context @c.
 * The function does wait for the result.
 * 
 * Return value:  0 on success or an errorcode. 
 **/
GpgmeError
gpgme_op_encrypt (GpgmeCtx ctx, GpgmeRecipients recp,
		  GpgmeData plain, GpgmeData cipher)
{
  int err = _gpgme_op_encrypt_start (ctx, 1, recp, plain, cipher);
  if (!err)
    err = _gpgme_wait_one (ctx);
  return err;
}