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OSSL_STORE_LOADER_set_ctrl.3
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" 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_find, 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_find_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 .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/store.h> \& \& typedef struct ossl_store_loader_st OSSL_STORE_LOADER; \& \& OSSL_STORE_LOADER *OSSL_STORE_LOADER_new(ENGINE *e, const char *scheme); \& const ENGINE *OSSL_STORE_LOADER_get0_engine(const OSSL_STORE_LOADER \& *store_loader); \& const char *OSSL_STORE_LOADER_get0_scheme(const OSSL_STORE_LOADER \& *store_loader); \& \& /* struct ossl_store_loader_ctx_st is defined differently by each loader */ \& typedef struct ossl_store_loader_ctx_st OSSL_STORE_LOADER_CTX; \& \& typedef OSSL_STORE_LOADER_CTX *(*OSSL_STORE_open_fn)(const char *uri, \& const UI_METHOD *ui_method, \& void *ui_data); \& int OSSL_STORE_LOADER_set_open(OSSL_STORE_LOADER *store_loader, \& OSSL_STORE_open_fn store_open_function); \& typedef int (*OSSL_STORE_ctrl_fn)(OSSL_STORE_LOADER_CTX *ctx, int cmd, \& 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 int (*OSSL_STORE_find_fn)(OSSL_STORE_LOADER_CTX *ctx, \& OSSL_STORE_SEARCH *criteria); \& int OSSL_STORE_LOADER_set_find(OSSL_STORE_LOADER *loader, \& OSSL_STORE_find_fn find_function); \& typedef OSSL_STORE_INFO *(*OSSL_STORE_load_fn)(OSSL_STORE_LOADER_CTX *ctx, \& UI_METHOD *ui_method, \& void *ui_data); \& int OSSL_STORE_LOADER_set_load(OSSL_STORE_LOADER *store_loader, \& OSSL_STORE_load_fn store_load_function); \& typedef int (*OSSL_STORE_eof_fn)(OSSL_STORE_LOADER_CTX *ctx); \& int OSSL_STORE_LOADER_set_eof(OSSL_STORE_LOADER *store_loader, \& OSSL_STORE_eof_fn store_eof_function); \& typedef int (*OSSL_STORE_error_fn)(OSSL_STORE_LOADER_CTX *ctx); \& int OSSL_STORE_LOADER_set_error(OSSL_STORE_LOADER *store_loader, \& OSSL_STORE_error_fn store_error_function); \& typedef int (*OSSL_STORE_close_fn)(OSSL_STORE_LOADER_CTX *ctx); \& int OSSL_STORE_LOADER_set_close(OSSL_STORE_LOADER *store_loader, \& OSSL_STORE_close_fn store_close_function); \& void OSSL_STORE_LOADER_free(OSSL_STORE_LOADER *store_loader); \& \& int OSSL_STORE_register_loader(OSSL_STORE_LOADER *loader); \& OSSL_STORE_LOADER *OSSL_STORE_unregister_loader(const char *scheme); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" These functions help applications and engines to create loaders for schemes they support. .SS "Types" .IX Subsection "Types" \&\fB\s-1OSSL_STORE_LOADER\s0\fR is the type to hold a loader. It contains a scheme and the functions needed to implement \&\fBOSSL_STORE_open()\fR, \fBOSSL_STORE_load()\fR, \fBOSSL_STORE_eof()\fR, \fBOSSL_STORE_error()\fR and \&\fBOSSL_STORE_close()\fR for this scheme. .PP \&\fB\s-1OSSL_STORE_LOADER_CTX\s0\fR is a type template, to be defined by each loader using \fBstruct ossl_store_loader_ctx_st { ... }\fR. .PP \&\fBOSSL_STORE_open_fn\fR, \fBOSSL_STORE_ctrl_fn\fR, \fBOSSL_STORE_expect_fn\fR, \&\fBOSSL_STORE_find_fn\fR, \fBOSSL_STORE_load_fn\fR, \fBOSSL_STORE_eof_fn\fR, and \fBOSSL_STORE_close_fn\fR are the function pointer types used within a \s-1STORE\s0 loader. The functions pointed at define the functionality of the given loader. .IP "\fBOSSL_STORE_open_fn\fR" 4 .IX Item "OSSL_STORE_open_fn" This function takes a \s-1URI\s0 and is expected to interpret it in the best manner possible according to the scheme the loader implements, it also takes a \fB\s-1UI_METHOD\s0\fR and associated data, to be used any time something needs to be prompted for. Furthermore, this function is expected to initialize what needs to be initialized, to create a private data store (\fB\s-1OSSL_STORE_LOADER_CTX\s0\fR, see above), and to return it. If something goes wrong, this function is expected to return \s-1NULL.\s0 .IP "\fBOSSL_STORE_ctrl_fn\fR" 4 .IX Item "OSSL_STORE_ctrl_fn" This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer, a command number \&\fBcmd\fR and a \fBva_list\fR \fBargs\fR and is used to manipulate loader specific parameters. .Sp Loader specific command numbers must begin at \fB\s-1OSSL_STORE_C_CUSTOM_START\s0\fR. Any number below that is reserved for future globally known command numbers. .Sp This function is expected to return 1 on success, 0 on error. .IP "\fBOSSL_STORE_expect_fn\fR" 4 .IX Item "OSSL_STORE_expect_fn" This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer and a \fB\s-1OSSL_STORE_INFO\s0\fR identity \fBexpected\fR, and is used to tell the loader what object type is expected. \&\fBexpected\fR may be zero to signify that no specific object type is expected. .Sp This function is expected to return 1 on success, 0 on error. .IP "\fBOSSL_STORE_find_fn\fR" 4 .IX Item "OSSL_STORE_find_fn" This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer and a \&\fB\s-1OSSL_STORE_SEARCH\s0\fR search criterion, and is used to tell the loader what to search for. .Sp When called with the loader context being \fB\s-1NULL\s0\fR, this function is expected to return 1 if the loader supports the criterion, otherwise 0. .Sp When called with the loader context being something other than \fB\s-1NULL\s0\fR, this function is expected to return 1 on success, 0 on error. .IP "\fBOSSL_STORE_load_fn\fR" 4 .IX Item "OSSL_STORE_load_fn" This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer and a \fB\s-1UI_METHOD\s0\fR with associated data. It's expected to load the next available data, mold it into a data structure that can be wrapped in a \fB\s-1OSSL_STORE_INFO\s0\fR using one of the \&\s-1\fBOSSL_STORE_INFO\s0\fR\|(3) functions. If no more data is available or an error occurs, this function is expected to return \s-1NULL.\s0 The \fBOSSL_STORE_eof_fn\fR and \fBOSSL_STORE_error_fn\fR functions must indicate if it was in fact the end of data or if an error occurred. .Sp Note that this function retrieves \fIone\fR data item only. .IP "\fBOSSL_STORE_eof_fn\fR" 4 .IX Item "OSSL_STORE_eof_fn" This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer and is expected to return 1 to indicate that the end of available data has been reached. It is otherwise expected to return 0. .IP "\fBOSSL_STORE_error_fn\fR" 4 .IX Item "OSSL_STORE_error_fn" This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer and is expected to return 1 to indicate that an error occurred in a previous call to the \&\fBOSSL_STORE_load_fn\fR function. It is otherwise expected to return 0. .IP "\fBOSSL_STORE_close_fn\fR" 4 .IX Item "OSSL_STORE_close_fn" This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer and is expected to close or shut down what needs to be closed, and finally free the contents of the \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer. It returns 1 on success and 0 on error. .SS "Functions" .IX Subsection "Functions" \&\fBOSSL_STORE_LOADER_new()\fR creates a new \fB\s-1OSSL_STORE_LOADER\s0\fR. It takes an \fB\s-1ENGINE\s0\fR \fBe\fR and a string \fBscheme\fR. \&\fBscheme\fR must \fIalways\fR be set. Both \fBe\fR and \fBscheme\fR are used as is and must therefore be alive as long as the created loader is. .PP \&\fBOSSL_STORE_LOADER_get0_engine()\fR returns the engine of the \fBstore_loader\fR. \&\fBOSSL_STORE_LOADER_get0_scheme()\fR returns the scheme of the \fBstore_loader\fR. .PP \&\fBOSSL_STORE_LOADER_set_open()\fR sets the opener function for the \&\fBstore_loader\fR. .PP \&\fBOSSL_STORE_LOADER_set_ctrl()\fR sets the control function for the \&\fBstore_loader\fR. .PP \&\fBOSSL_STORE_LOADER_set_expect()\fR sets the expect function for the \&\fBstore_loader\fR. .PP \&\fBOSSL_STORE_LOADER_set_load()\fR sets the loader function for the \&\fBstore_loader\fR. .PP \&\fBOSSL_STORE_LOADER_set_eof()\fR sets the end of file checker function for the \&\fBstore_loader\fR. .PP \&\fBOSSL_STORE_LOADER_set_close()\fR sets the closing function for the \&\fBstore_loader\fR. .PP \&\fBOSSL_STORE_LOADER_free()\fR frees the given \fBstore_loader\fR. .PP \&\fBOSSL_STORE_register_loader()\fR register the given \fBstore_loader\fR and thereby makes it available for use with \fBOSSL_STORE_open()\fR, \fBOSSL_STORE_load()\fR, \&\fBOSSL_STORE_eof()\fR and \fBOSSL_STORE_close()\fR. .PP \&\fBOSSL_STORE_unregister_loader()\fR unregister the store loader for the given \&\fBscheme\fR. .SH "NOTES" .IX Header "NOTES" The \fBfile:\fR scheme has built in support. .SH "RETURN VALUES" .IX Header "RETURN VALUES" The functions with the types \fBOSSL_STORE_open_fn\fR, \fBOSSL_STORE_ctrl_fn\fR, \&\fBOSSL_STORE_expect_fn\fR, \&\fBOSSL_STORE_load_fn\fR, \fBOSSL_STORE_eof_fn\fR and \fBOSSL_STORE_close_fn\fR have the same return values as \fBOSSL_STORE_open()\fR, \fBOSSL_STORE_ctrl()\fR, \fBOSSL_STORE_expect()\fR, \&\fBOSSL_STORE_load()\fR, \fBOSSL_STORE_eof()\fR and \fBOSSL_STORE_close()\fR, respectively. .PP \&\fBOSSL_STORE_LOADER_new()\fR returns a pointer to a \fB\s-1OSSL_STORE_LOADER\s0\fR on success, or \fB\s-1NULL\s0\fR on failure. .PP \&\fBOSSL_STORE_LOADER_set_open()\fR, \fBOSSL_STORE_LOADER_set_ctrl()\fR, \&\fBOSSL_STORE_LOADER_set_load()\fR, \fBOSSL_STORE_LOADER_set_eof()\fR and \&\fBOSSL_STORE_LOADER_set_close()\fR return 1 on success, or 0 on failure. .PP \&\fBOSSL_STORE_register_loader()\fR returns 1 on success, or 0 on failure. .PP \&\fBOSSL_STORE_unregister_loader()\fR returns the unregistered loader on success, or \fB\s-1NULL\s0\fR on failure. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fBossl_store\fR\|(7), \fBOSSL_STORE_open\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\s-1\fBOSSL_STORE_LOADER\s0()\fR, \s-1\fBOSSL_STORE_LOADER_CTX\s0()\fR, \fBOSSL_STORE_LOADER_new()\fR, \&\fBOSSL_STORE_LOADER_set0_scheme()\fR, \fBOSSL_STORE_LOADER_set_open()\fR, \&\fBOSSL_STORE_LOADER_set_ctrl()\fR, \fBOSSL_STORE_LOADER_set_load()\fR, \&\fBOSSL_STORE_LOADER_set_eof()\fR, \fBOSSL_STORE_LOADER_set_close()\fR, \&\fBOSSL_STORE_LOADER_free()\fR, \fBOSSL_STORE_register_loader()\fR, \&\fBOSSL_STORE_unregister_loader()\fR, \fBOSSL_STORE_open_fn()\fR, \fBOSSL_STORE_ctrl_fn()\fR, \&\fBOSSL_STORE_load_fn()\fR, \fBOSSL_STORE_eof_fn()\fR and \fBOSSL_STORE_close_fn()\fR were added in OpenSSL 1.1.1. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2016\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
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