/* vfs-mount.c - vfs mount support in GPGME
* Copyright (C) 2009 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://gnu.org/licenses/>.
* SPDX-License-Identifier: LGPL-2.1-or-later
*/
#if HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include "gpgme.h"
#include "debug.h"
#include "context.h"
#include "ops.h"
#include "util.h"
typedef struct
{
struct _gpgme_op_vfs_mount_result result;
} *op_data_t;
gpgme_vfs_mount_result_t
gpgme_op_vfs_mount_result (gpgme_ctx_t ctx)
{
gpgme_error_t err;
void *hook;
op_data_t opd;
err = _gpgme_op_data_lookup (ctx, OPDATA_VFS_MOUNT, &hook, -1, NULL);
opd = hook;
/* Check in case this function is used without having run a command
before. */
if (err || !opd)
return NULL;
return &opd->result;
}
static gpgme_error_t
_gpgme_vfs_mount_status_handler (void *priv, const char *code, const 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_VFS_MOUNT, &hook, -1, NULL);
opd = hook;
if (err)
return err;
if (! strcasecmp ("MOUNTPOINT", code))
{
if (opd->result.mount_dir)
free (opd->result.mount_dir);
opd->result.mount_dir = strdup (args);
}
return 0;
}
static gpgme_error_t
vfs_start (gpgme_ctx_t ctx, int synchronous,
const char *command,
gpgme_assuan_data_cb_t data_cb,
void *data_cb_value,
gpgme_assuan_inquire_cb_t inq_cb,
void *inq_cb_value,
gpgme_assuan_status_cb_t status_cb,
void *status_cb_value)
{
gpgme_error_t err;
void *hook;
op_data_t opd;
if (!command || !*command)
return gpg_error (GPG_ERR_INV_VALUE);
/* The flag value 256 is used to suppress an engine reset. This is
required to keep the connection running. */
err = _gpgme_op_reset (ctx, ((synchronous & 255) | 256));
if (err)
return err;
err = _gpgme_op_data_lookup (ctx, OPDATA_VFS_MOUNT, &hook, sizeof (*opd),
NULL);
opd = hook;
if (err)
return err;
return _gpgme_engine_op_assuan_transact (ctx->engine, command,
data_cb, data_cb_value,
inq_cb, inq_cb_value,
status_cb, status_cb_value);
}
#if 0
/* XXXX. This is the asynchronous variant. */
static gpgme_error_t
gpgme_op_vfs_transact_start (gpgme_ctx_t ctx,
const char *command,
gpgme_assuan_data_cb_t data_cb,
void *data_cb_value,
gpgme_assuan_inquire_cb_t inq_cb,
void *inq_cb_value,
gpgme_assuan_status_cb_t status_cb,
void *status_cb_value)
{
return vfs_start (ctx, 0, command, data_cb, data_cb_value,
inq_cb, inq_cb_value, status_cb, status_cb_value);
}
#endif
/* XXXX. This is the synchronous variant. */
static gpgme_error_t
gpgme_op_vfs_transact (gpgme_ctx_t ctx,
const char *command,
gpgme_assuan_data_cb_t data_cb,
void *data_cb_value,
gpgme_assuan_inquire_cb_t inq_cb,
void *inq_cb_value,
gpgme_assuan_status_cb_t status_cb,
void *status_cb_value,
gpgme_error_t *op_err)
{
gpgme_error_t err;
if (!ctx)
return gpg_error (GPG_ERR_INV_VALUE);
err = vfs_start (ctx, 1, command, data_cb, data_cb_value,
inq_cb, inq_cb_value, status_cb, status_cb_value);
if (!err)
err = _gpgme_wait_one_ext (ctx, op_err);
return err;
}
/* The actual exported interface follows. */
/* The container is automatically unmounted when the context is reset
or destroyed. This is a synchronous convenience interface, which
automatically returns an operation error if there is no
transmission error. */
static gpgme_error_t
_gpgme_op_vfs_mount (gpgme_ctx_t ctx, const char *container_file,
const char *mount_dir, int flags, gpgme_error_t *op_err)
{
gpg_error_t err;
char *cmd;
char *container_file_esc = NULL;
(void)flags;
/* We want to encourage people to check error values, so not getting
them is discouraged here. Also makes our code easier. */
if (! op_err)
return gpg_error (GPG_ERR_INV_VALUE);
err = _gpgme_encode_percent_string (container_file, &container_file_esc, 0);
if (err)
return err;
if (gpgrt_asprintf (&cmd, "OPEN -- %s", container_file_esc) < 0)
{
err = gpg_error_from_syserror ();
free (container_file_esc);
return err;
}
free (container_file_esc);
err = gpgme_op_vfs_transact (ctx, cmd, NULL, NULL, NULL, NULL,
NULL, NULL, op_err);
gpgrt_free (cmd);
if (err || *op_err)
return err;
if (mount_dir)
{
char *mount_dir_esc = NULL;
err = _gpgme_encode_percent_string (mount_dir, &mount_dir_esc, 0);
if (err)
return err;
if (gpgrt_asprintf (&cmd, "MOUNT -- %s", mount_dir_esc) < 0)
{
err = gpg_error_from_syserror ();
free (mount_dir_esc);
return err;
}
free (mount_dir_esc);
}
else
{
if (gpgrt_asprintf (&cmd, "MOUNT") < 0)
return gpg_error_from_syserror ();
}
err = gpgme_op_vfs_transact (ctx, cmd, NULL, NULL, NULL, NULL,
_gpgme_vfs_mount_status_handler, ctx, op_err);
gpgrt_free (cmd);
return err;
}
gpgme_error_t
gpgme_op_vfs_mount (gpgme_ctx_t ctx, const char *container_file,
const char *mount_dir, unsigned int flags,
gpgme_error_t *op_err)
{
gpg_error_t err;
TRACE_BEG (DEBUG_CTX, "gpgme_op_vfs_mount", ctx,
"container=%s, mount_dir=%s, flags=0x%x, op_err=%p",
container_file, mount_dir, flags, op_err);
if (!ctx)
return TRACE_ERR (gpg_error (GPG_ERR_INV_VALUE));
err = _gpgme_op_vfs_mount (ctx, container_file, mount_dir, flags, op_err);
return TRACE_ERR (err);
}