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backend-support.c
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backend-support.c
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/* backend-support.c - Supporting functions for the backend.
* Copyright (C) 2019 g10 Code GmbH
*
* This file is part of GnuPG.
*
* GnuPG 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 3 of the License, or
* (at your option) any later version.
*
* GnuPG 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, see <https://www.gnu.org/licenses/>.
* SPDX-License-Identifier: GPL-3.0+
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include "keyboxd.h"
#include "../common/i18n.h"
#include "../common/asshelp.h"
#include "backend.h"
/* Common definition part of all backend handle. */
struct backend_handle_s
{
enum database_types db_type;
};
/* Return a string with the name of the database type T. */
const char *
strdbtype (enum database_types t)
{
switch (t)
{
case DB_TYPE_NONE: return "none";
case DB_TYPE_KBX: return "keybox";
}
return "?";
}
/* Return a new backend ID. Backend IDs are used to identify backends
* without using the actual object. The number of backend resources
* is limited because they are specified in the config file. Thus an
* overflow check is not required. */
unsigned int
be_new_backend_id (void)
{
static unsigned int last;
return ++last;
}
/* Release the backend described by HD. This is a generic function
* which dispatches to the the actual backend. */
void
be_generic_release_backend (ctrl_t ctrl, backend_handle_t hd)
{
if (!hd)
return;
switch (hd->db_type)
{
case DB_TYPE_NONE:
xfree (hd);
break;
case DB_TYPE_KBX:
be_kbx_release_resource (ctrl, hd);
break;
default:
log_error ("%s: faulty backend handle of type %d given\n",
__func__, hd->db_type);
}
}
/* Release the request object REQ. */
void
be_release_request (db_request_t req)
{
db_request_part_t part, partn;
if (!req)
return;
for (part = req->part; part; part = partn)
{
partn = part->next;
be_kbx_release_kbx_hd (part->kbx_hd);
xfree (part);
}
}
/* Return the public key (BUFFER,BUFLEN) which has the type
* PUBVKEY_TYPE to the caller. Owenership of BUFFER is taken by thgis
* function even in the error case. */
gpg_error_t
be_return_pubkey (ctrl_t ctrl, void *buffer, size_t buflen,
enum pubkey_types pubkey_type)
{
gpg_error_t err;
err = status_printf (ctrl, "PUBKEY_TYPE", "%d", pubkey_type);
if (err)
goto leave;
if (ctrl->no_data_return)
err = 0;
else
err = kbxd_write_data_line(ctrl, buffer, buflen);
leave:
xfree (buffer);
return err;
}

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