OSSL_STORE_LOADER, OSSL_STORE_LOADER_CTX, OSSL_STORE_LOADER_new,
OSSL_STORE_LOADER_get0_engine, OSSL_STORE_LOADER_get0_scheme,
OSSL_STORE_LOADER_set_open, OSSL_STORE_LOADER_set_ctrl,
+OSSL_STORE_LOADER_set_expect,
OSSL_STORE_LOADER_set_load, OSSL_STORE_LOADER_set_eof,
OSSL_STORE_LOADER_set_error, OSSL_STORE_LOADER_set_close,
OSSL_STORE_LOADER_free, OSSL_STORE_register_loader,
OSSL_STORE_unregister_loader, OSSL_STORE_open_fn, OSSL_STORE_ctrl_fn,
+OSSL_STORE_expect_fn,
OSSL_STORE_load_fn, OSSL_STORE_eof_fn, OSSL_STORE_error_fn,
OSSL_STORE_close_fn - Types and functions to manipulate, register and
unregister STORE loaders for different URI schemes
va_list args);
int OSSL_STORE_LOADER_set_ctrl(OSSL_STORE_LOADER *store_loader,
OSSL_STORE_ctrl_fn store_ctrl_function);
+ typedef int (*OSSL_STORE_expect_fn)(OSSL_STORE_LOADER_CTX *ctx, int expected);
+ int OSSL_STORE_LOADER_set_expect(OSSL_STORE_LOADER *loader,
+ OSSL_STORE_expect_fn expect_function);
typedef OSSL_STORE_INFO *(*OSSL_STORE_load_fn)(OSSL_STORE_LOADER_CTX *ctx,
UI_METHOD *ui_method,
void *ui_data);
B<OSSL_STORE_LOADER_CTX> is a type template, to be defined by each loader
using B<struct ossl_store_loader_ctx_st { ... }>.
-B<OSSL_STORE_open_fn>, B<OSSL_STORE_ctrl_fn>, B<OSSL_STORE_load_fn>,
-B<OSSL_STORE_eof_fn> and B<OSSL_STORE_close_fn> are the function pointer
-types used within a STORE loader.
+B<OSSL_STORE_open_fn>, B<OSSL_STORE_ctrl_fn>, B<OSSL_STORE_expect_fn>,
+B<OSSL_STORE_load_fn>, B<OSSL_STORE_eof_fn> and B<OSSL_STORE_close_fn>
+are the function pointer types used within a STORE loader.
The functions pointed at define the functionality of the given loader.
=over 4
This function is expected to return 1 on success, 0 on error.
+=item B<OSSL_STORE_expect_fn>
+
+This function takes a B<OSSL_STORE_LOADER_CTX> pointer and a B<OSSL_STORE_INFO>
+identity B<expected>, and is used to tell the loader what object type is
+expected.
+B<expected> may be zero to signify that no specific object type is expected.
+
+This function is expected to return 1 on success, 0 on error.
+
=item B<OSSL_STORE_load_fn>
This function takes a B<OSSL_STORE_LOADER_CTX> pointer and a B<UI_METHOD>
OSSL_STORE_LOADER_set_ctrl() sets the control function for the
B<store_loader>.
+OSSL_STORE_LOADER_set_expect() sets the expect function for the
+B<store_loader>.
+
OSSL_STORE_LOADER_set_load() sets the loader function for the
B<store_loader>.
=head1 RETURN VALUES
The functions with the types B<OSSL_STORE_open_fn>, B<OSSL_STORE_ctrl_fn>,
+B<OSSL_STORE_expect_fn>,
B<OSSL_STORE_load_fn>, B<OSSL_STORE_eof_fn> and B<OSSL_STORE_close_fn> have the
-same return values as OSSL_STORE_open(), OSSL_STORE_load(), OSSL_STORE_eof() and
-OSSL_STORE_close(), respectively.
+same return values as OSSL_STORE_open(), OSSL_STORE_ctrl(), OSSL_STORE_expect(),
+OSSL_STORE_load(), OSSL_STORE_eof() and OSSL_STORE_close(), respectively.
OSSL_STORE_LOADER_new() returns a pointer to a B<OSSL_STORE_LOADER> on success,
or B<NULL> on failure.
--- /dev/null
+=pod
+
+=head1 NAME
+
+OSSL_STORE_expect - Specify what object type is expected
+
+=head1 SYNOPSIS
+
+ #include <openssl/store.h>
+
+ int OSSL_STORE_expect(OSSL_STORE_CTX *ctx, int expected_type);
+
+=head1 DESCRIPTION
+
+OSSL_STORE_expect() helps applications filter what OSSL_STORE_load() returns
+by specifying a B<OSSL_STORE_INFO> type.
+For example, if C<file:/foo/bar/store.pem> contains several different objects
+and only the certificates are interesting, the application can simply say
+that it expects the type B<OSSL_STORE_INFO_CERT>.
+All known object types (see L<OSSL_STORE_INFO(3)/SUPPORTED OBJECTS>)
+except for B<OSSL_STORE_INFO_NAME> are supported.
+
+OSSL_STORE_expect() I<must> be called before the first OSSL_STORE_load()
+of a given session, or it will fail.
+
+=head1 NOTES
+
+If a more elaborate filter is required by the application, a better choice
+would be to use a post-processing function.
+See L<OSSL_STORE_open(3)> for more information.
+
+However, some loaders may take advantage of the knowledge of an expected type
+to make object retrieval more efficient, so if a single type is expected, this
+method is usually preferable.
+
+=head1 RETURN VALUES
+
+OSSL_STORE_expect() returns 1 on success, or 0 on failure.
+
+=head1 SEE ALSO
+
+L<ossl_store(7)>, L<OSSL_STORE_INFO(3)>, L<OSSL_STORE_load(3)>
+
+=head1 HISTORY
+
+OSSL_STORE_expect()
+was added to OpenSSL 1.1.1.
+
+=head1 COPYRIGHT
+
+Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the OpenSSL license (the "License"). You may not use
+this file except in compliance with the License. You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut