265 lines
10 KiB
Plaintext
265 lines
10 KiB
Plaintext
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=pod
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=head1 NAME
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OSSL_STORE_LOADER, OSSL_STORE_LOADER_CTX, OSSL_STORE_LOADER_new,
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OSSL_STORE_LOADER_get0_engine, OSSL_STORE_LOADER_get0_scheme,
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OSSL_STORE_LOADER_set_open, OSSL_STORE_LOADER_set_ctrl,
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OSSL_STORE_LOADER_set_expect, OSSL_STORE_LOADER_set_find,
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OSSL_STORE_LOADER_set_load, OSSL_STORE_LOADER_set_eof,
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OSSL_STORE_LOADER_set_error, OSSL_STORE_LOADER_set_close,
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OSSL_STORE_LOADER_free, OSSL_STORE_register_loader,
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OSSL_STORE_unregister_loader, OSSL_STORE_open_fn, OSSL_STORE_ctrl_fn,
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OSSL_STORE_expect_fn, OSSL_STORE_find_fn,
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OSSL_STORE_load_fn, OSSL_STORE_eof_fn, OSSL_STORE_error_fn,
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OSSL_STORE_close_fn - Types and functions to manipulate, register and
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unregister STORE loaders for different URI schemes
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=head1 SYNOPSIS
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#include <openssl/store.h>
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typedef struct ossl_store_loader_st OSSL_STORE_LOADER;
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OSSL_STORE_LOADER *OSSL_STORE_LOADER_new(ENGINE *e, const char *scheme);
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const ENGINE *OSSL_STORE_LOADER_get0_engine(const OSSL_STORE_LOADER
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*store_loader);
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const char *OSSL_STORE_LOADER_get0_scheme(const OSSL_STORE_LOADER
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*store_loader);
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/* struct ossl_store_loader_ctx_st is defined differently by each loader */
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typedef struct ossl_store_loader_ctx_st OSSL_STORE_LOADER_CTX;
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typedef OSSL_STORE_LOADER_CTX *(*OSSL_STORE_open_fn)(const char *uri,
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const UI_METHOD *ui_method,
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void *ui_data);
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int OSSL_STORE_LOADER_set_open(OSSL_STORE_LOADER *store_loader,
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OSSL_STORE_open_fn store_open_function);
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typedef int (*OSSL_STORE_ctrl_fn)(OSSL_STORE_LOADER_CTX *ctx, int cmd,
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va_list args);
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int OSSL_STORE_LOADER_set_ctrl(OSSL_STORE_LOADER *store_loader,
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OSSL_STORE_ctrl_fn store_ctrl_function);
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typedef int (*OSSL_STORE_expect_fn)(OSSL_STORE_LOADER_CTX *ctx, int expected);
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int OSSL_STORE_LOADER_set_expect(OSSL_STORE_LOADER *loader,
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OSSL_STORE_expect_fn expect_function);
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typedef int (*OSSL_STORE_find_fn)(OSSL_STORE_LOADER_CTX *ctx,
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OSSL_STORE_SEARCH *criteria);
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int OSSL_STORE_LOADER_set_find(OSSL_STORE_LOADER *loader,
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OSSL_STORE_find_fn find_function);
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typedef OSSL_STORE_INFO *(*OSSL_STORE_load_fn)(OSSL_STORE_LOADER_CTX *ctx,
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UI_METHOD *ui_method,
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void *ui_data);
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int OSSL_STORE_LOADER_set_load(OSSL_STORE_LOADER *store_loader,
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OSSL_STORE_load_fn store_load_function);
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typedef int (*OSSL_STORE_eof_fn)(OSSL_STORE_LOADER_CTX *ctx);
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int OSSL_STORE_LOADER_set_eof(OSSL_STORE_LOADER *store_loader,
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OSSL_STORE_eof_fn store_eof_function);
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typedef int (*OSSL_STORE_error_fn)(OSSL_STORE_LOADER_CTX *ctx);
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int OSSL_STORE_LOADER_set_error(OSSL_STORE_LOADER *store_loader,
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OSSL_STORE_error_fn store_error_function);
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typedef int (*OSSL_STORE_close_fn)(OSSL_STORE_LOADER_CTX *ctx);
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int OSSL_STORE_LOADER_set_close(OSSL_STORE_LOADER *store_loader,
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OSSL_STORE_close_fn store_close_function);
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void OSSL_STORE_LOADER_free(OSSL_STORE_LOADER *store_loader);
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int OSSL_STORE_register_loader(OSSL_STORE_LOADER *loader);
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OSSL_STORE_LOADER *OSSL_STORE_unregister_loader(const char *scheme);
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=head1 DESCRIPTION
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These functions help applications and engines to create loaders for
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schemes they support.
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=head2 Types
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B<OSSL_STORE_LOADER> is the type to hold a loader.
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It contains a scheme and the functions needed to implement
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OSSL_STORE_open(), OSSL_STORE_load(), OSSL_STORE_eof(), OSSL_STORE_error() and
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OSSL_STORE_close() for this scheme.
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B<OSSL_STORE_LOADER_CTX> is a type template, to be defined by each loader
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using B<struct ossl_store_loader_ctx_st { ... }>.
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B<OSSL_STORE_open_fn>, B<OSSL_STORE_ctrl_fn>, B<OSSL_STORE_expect_fn>,
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B<OSSL_STORE_find_fn>, B<OSSL_STORE_load_fn>, B<OSSL_STORE_eof_fn>,
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and B<OSSL_STORE_close_fn>
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are the function pointer types used within a STORE loader.
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The functions pointed at define the functionality of the given loader.
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=over 4
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=item B<OSSL_STORE_open_fn>
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This function takes a URI and is expected to interpret it in the best
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manner possible according to the scheme the loader implements, it also
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takes a B<UI_METHOD> and associated data, to be used any time
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something needs to be prompted for.
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Furthermore, this function is expected to initialize what needs to be
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initialized, to create a private data store (B<OSSL_STORE_LOADER_CTX>, see
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above), and to return it.
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If something goes wrong, this function is expected to return NULL.
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=item B<OSSL_STORE_ctrl_fn>
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This function takes a B<OSSL_STORE_LOADER_CTX> pointer, a command number
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B<cmd> and a B<va_list> B<args> and is used to manipulate loader
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specific parameters.
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=begin comment
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Globally known command numbers are documented in L<OSSL_STORE_ctrl(3)>,
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along with what B<args> are expected with each of them.
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=end comment
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Loader specific command numbers must begin at B<OSSL_STORE_C_CUSTOM_START>.
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Any number below that is reserved for future globally known command
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numbers.
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This function is expected to return 1 on success, 0 on error.
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=item B<OSSL_STORE_expect_fn>
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This function takes a B<OSSL_STORE_LOADER_CTX> pointer and a B<OSSL_STORE_INFO>
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identity B<expected>, and is used to tell the loader what object type is
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expected.
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B<expected> may be zero to signify that no specific object type is expected.
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This function is expected to return 1 on success, 0 on error.
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=item B<OSSL_STORE_find_fn>
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This function takes a B<OSSL_STORE_LOADER_CTX> pointer and a
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B<OSSL_STORE_SEARCH> search criterion, and is used to tell the loader what
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to search for.
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When called with the loader context being B<NULL>, this function is expected
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to return 1 if the loader supports the criterion, otherwise 0.
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When called with the loader context being something other than B<NULL>, this
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function is expected to return 1 on success, 0 on error.
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=item B<OSSL_STORE_load_fn>
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This function takes a B<OSSL_STORE_LOADER_CTX> pointer and a B<UI_METHOD>
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with associated data.
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It's expected to load the next available data, mold it into a data
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structure that can be wrapped in a B<OSSL_STORE_INFO> using one of the
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L<OSSL_STORE_INFO(3)> functions.
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If no more data is available or an error occurs, this function is
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expected to return NULL.
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The B<OSSL_STORE_eof_fn> and B<OSSL_STORE_error_fn> functions must indicate if
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it was in fact the end of data or if an error occurred.
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Note that this function retrieves I<one> data item only.
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=item B<OSSL_STORE_eof_fn>
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This function takes a B<OSSL_STORE_LOADER_CTX> pointer and is expected to
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return 1 to indicate that the end of available data has been reached.
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It is otherwise expected to return 0.
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=item B<OSSL_STORE_error_fn>
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This function takes a B<OSSL_STORE_LOADER_CTX> pointer and is expected to
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return 1 to indicate that an error occurred in a previous call to the
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B<OSSL_STORE_load_fn> function.
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It is otherwise expected to return 0.
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=item B<OSSL_STORE_close_fn>
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This function takes a B<OSSL_STORE_LOADER_CTX> pointer and is expected to
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close or shut down what needs to be closed, and finally free the
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contents of the B<OSSL_STORE_LOADER_CTX> pointer.
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It returns 1 on success and 0 on error.
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=back
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=head2 Functions
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OSSL_STORE_LOADER_new() creates a new B<OSSL_STORE_LOADER>.
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It takes an B<ENGINE> B<e> and a string B<scheme>.
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B<scheme> must I<always> be set.
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Both B<e> and B<scheme> are used as is and must therefore be alive as
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long as the created loader is.
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OSSL_STORE_LOADER_get0_engine() returns the engine of the B<store_loader>.
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OSSL_STORE_LOADER_get0_scheme() returns the scheme of the B<store_loader>.
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OSSL_STORE_LOADER_set_open() sets the opener function for the
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B<store_loader>.
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OSSL_STORE_LOADER_set_ctrl() sets the control function for the
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B<store_loader>.
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OSSL_STORE_LOADER_set_expect() sets the expect function for the
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B<store_loader>.
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OSSL_STORE_LOADER_set_load() sets the loader function for the
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B<store_loader>.
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OSSL_STORE_LOADER_set_eof() sets the end of file checker function for the
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B<store_loader>.
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OSSL_STORE_LOADER_set_close() sets the closing function for the
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B<store_loader>.
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OSSL_STORE_LOADER_free() frees the given B<store_loader>.
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OSSL_STORE_register_loader() register the given B<store_loader> and thereby
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makes it available for use with OSSL_STORE_open(), OSSL_STORE_load(),
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OSSL_STORE_eof() and OSSL_STORE_close().
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OSSL_STORE_unregister_loader() unregister the store loader for the given
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B<scheme>.
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=head1 NOTES
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The B<file:> scheme has built in support.
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=head1 RETURN VALUES
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The functions with the types B<OSSL_STORE_open_fn>, B<OSSL_STORE_ctrl_fn>,
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B<OSSL_STORE_expect_fn>,
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B<OSSL_STORE_load_fn>, B<OSSL_STORE_eof_fn> and B<OSSL_STORE_close_fn> have the
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same return values as OSSL_STORE_open(), OSSL_STORE_ctrl(), OSSL_STORE_expect(),
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OSSL_STORE_load(), OSSL_STORE_eof() and OSSL_STORE_close(), respectively.
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OSSL_STORE_LOADER_new() returns a pointer to a B<OSSL_STORE_LOADER> on success,
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or B<NULL> on failure.
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OSSL_STORE_LOADER_set_open(), OSSL_STORE_LOADER_set_ctrl(),
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OSSL_STORE_LOADER_set_load(), OSSL_STORE_LOADER_set_eof() and
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OSSL_STORE_LOADER_set_close() return 1 on success, or 0 on failure.
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OSSL_STORE_register_loader() returns 1 on success, or 0 on failure.
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OSSL_STORE_unregister_loader() returns the unregistered loader on success,
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or B<NULL> on failure.
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=head1 SEE ALSO
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L<ossl_store(7)>, L<OSSL_STORE_open(3)>
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=head1 HISTORY
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OSSL_STORE_LOADER(), OSSL_STORE_LOADER_CTX(), OSSL_STORE_LOADER_new(),
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OSSL_STORE_LOADER_set0_scheme(), OSSL_STORE_LOADER_set_open(),
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OSSL_STORE_LOADER_set_ctrl(), OSSL_STORE_LOADER_set_load(),
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OSSL_STORE_LOADER_set_eof(), OSSL_STORE_LOADER_set_close(),
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OSSL_STORE_LOADER_free(), OSSL_STORE_register_loader(),
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OSSL_STORE_unregister_loader(), OSSL_STORE_open_fn(), OSSL_STORE_ctrl_fn(),
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OSSL_STORE_load_fn(), OSSL_STORE_eof_fn() and OSSL_STORE_close_fn()
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were added in OpenSSL 1.1.1.
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=head1 COPYRIGHT
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Copyright 2016-2019 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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