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/* nbdkit
* Copyright Red Hat
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of Red Hat nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY RED HAT AND CONTRIBUTORS ''AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL RED HAT OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
#include <errno.h>
#include <assert.h>
#include "vector.h"
#include "internal.h"
/* Cap nr_exports to avoid sending over-large replies to the client,
* and to avoid a plugin with large list consuming too much memory.
*/
#define MAX_EXPORTS 10000
/* Appendable list of exports. */
DEFINE_VECTOR_TYPE (exports, struct nbdkit_export);
struct nbdkit_exports {
exports exports;
bool use_default;
};
NBDKIT_DLL_PUBLIC struct nbdkit_exports *
nbdkit_exports_new (void)
{
struct nbdkit_exports *r;
r = malloc (sizeof *r);
if (r == NULL) {
nbdkit_error ("nbdkit_exports_new: malloc: %m");
return NULL;
}
r->exports = (exports) empty_vector;
r->use_default = false;
return r;
}
static void
nbdkit_export_clear (struct nbdkit_export exp)
{
free (exp.name);
free (exp.description);
}
NBDKIT_DLL_PUBLIC void
nbdkit_exports_free (struct nbdkit_exports *exps)
{
if (exps) {
exports_iter (&exps->exports, nbdkit_export_clear);
free (exps->exports.ptr);
free (exps);
}
}
NBDKIT_DLL_PUBLIC size_t
nbdkit_exports_count (const struct nbdkit_exports *exps)
{
return exps->exports.len;
}
NBDKIT_DLL_PUBLIC const struct nbdkit_export
nbdkit_get_export (const struct nbdkit_exports *exps, size_t i)
{
assert (i < exps->exports.len);
return exps->exports.ptr[i];
}
NBDKIT_DLL_PUBLIC int
nbdkit_add_export (struct nbdkit_exports *exps,
const char *name, const char *description)
{
struct nbdkit_export e = { NULL, NULL };
if (exps->exports.len == MAX_EXPORTS) {
nbdkit_error ("nbdkit_add_export: too many exports");
errno = EINVAL;
return -1;
}
if (strlen (name) > NBD_MAX_STRING ||
(description && strlen (description) > NBD_MAX_STRING)) {
nbdkit_error ("nbdkit_add_export: string too long");
errno = EINVAL;
return -1;
}
e.name = strdup (name);
if (e.name == NULL) {
nbdkit_error ("nbdkit_add_export: strdup: %m");
return -1;
}
if (description) {
e.description = strdup (description);
if (e.description == NULL) {
nbdkit_error ("nbdkit_add_export: strdup: %m");
free (e.name);
errno = ENOMEM;
return -1;
}
}
if (exports_append (&exps->exports, e) == -1) {
nbdkit_error ("nbdkit_add_export: realloc: %m");
free (e.name);
free (e.description);
errno = ENOMEM;
return -1;
}
return 0;
}
NBDKIT_DLL_PUBLIC int
nbdkit_use_default_export (struct nbdkit_exports *exps)
{
exps->use_default = true;
return 0;
}
int
exports_resolve_default (struct nbdkit_exports *exps, struct backend *b,
int readonly)
{
const char *def = NULL;
if (exps->use_default) {
def = backend_default_export (b, readonly);
exps->use_default = false;
}
if (def)
return nbdkit_add_export (exps, def, NULL);
return 0;
}
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