forked from cory/tildefriends
363 lines
15 KiB
Groff
363 lines
15 KiB
Groff
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.\" ========================================================================
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.\"
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.IX Title "OSSL_STORE_LOADER 3"
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.TH OSSL_STORE_LOADER 3 "2020-04-21" "1.1.1g" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "NAME"
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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
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/store.h>
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\&
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\& typedef struct ossl_store_loader_st OSSL_STORE_LOADER;
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\&
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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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\&
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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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\&
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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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\&
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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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.Ve
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.SH "DESCRIPTION"
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.IX Header "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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.SS "Types"
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.IX Subsection "Types"
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\&\fB\s-1OSSL_STORE_LOADER\s0\fR 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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\&\fBOSSL_STORE_open()\fR, \fBOSSL_STORE_load()\fR, \fBOSSL_STORE_eof()\fR, \fBOSSL_STORE_error()\fR and
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\&\fBOSSL_STORE_close()\fR for this scheme.
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.PP
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\&\fB\s-1OSSL_STORE_LOADER_CTX\s0\fR is a type template, to be defined by each loader
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using \fBstruct ossl_store_loader_ctx_st { ... }\fR.
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.PP
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\&\fBOSSL_STORE_open_fn\fR, \fBOSSL_STORE_ctrl_fn\fR, \fBOSSL_STORE_expect_fn\fR,
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\&\fBOSSL_STORE_find_fn\fR, \fBOSSL_STORE_load_fn\fR, \fBOSSL_STORE_eof_fn\fR,
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and \fBOSSL_STORE_close_fn\fR
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are the function pointer types used within a \s-1STORE\s0 loader.
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The functions pointed at define the functionality of the given loader.
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.IP "\fBOSSL_STORE_open_fn\fR" 4
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.IX Item "OSSL_STORE_open_fn"
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This function takes a \s-1URI\s0 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 \fB\s-1UI_METHOD\s0\fR 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 (\fB\s-1OSSL_STORE_LOADER_CTX\s0\fR, see
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above), and to return it.
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If something goes wrong, this function is expected to return \s-1NULL.\s0
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.IP "\fBOSSL_STORE_ctrl_fn\fR" 4
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.IX Item "OSSL_STORE_ctrl_fn"
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This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer, a command number
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\&\fBcmd\fR and a \fBva_list\fR \fBargs\fR and is used to manipulate loader
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specific parameters.
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.Sp
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Loader specific command numbers must begin at \fB\s-1OSSL_STORE_C_CUSTOM_START\s0\fR.
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Any number below that is reserved for future globally known command
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numbers.
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.Sp
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This function is expected to return 1 on success, 0 on error.
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.IP "\fBOSSL_STORE_expect_fn\fR" 4
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.IX Item "OSSL_STORE_expect_fn"
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This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer and a \fB\s-1OSSL_STORE_INFO\s0\fR
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identity \fBexpected\fR, and is used to tell the loader what object type is
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expected.
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\&\fBexpected\fR may be zero to signify that no specific object type is expected.
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.Sp
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This function is expected to return 1 on success, 0 on error.
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.IP "\fBOSSL_STORE_find_fn\fR" 4
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.IX Item "OSSL_STORE_find_fn"
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This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer and a
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\&\fB\s-1OSSL_STORE_SEARCH\s0\fR search criterion, and is used to tell the loader what
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to search for.
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.Sp
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When called with the loader context being \fB\s-1NULL\s0\fR, this function is expected
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to return 1 if the loader supports the criterion, otherwise 0.
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.Sp
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When called with the loader context being something other than \fB\s-1NULL\s0\fR, this
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function is expected to return 1 on success, 0 on error.
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.IP "\fBOSSL_STORE_load_fn\fR" 4
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.IX Item "OSSL_STORE_load_fn"
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This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer and a \fB\s-1UI_METHOD\s0\fR
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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 \fB\s-1OSSL_STORE_INFO\s0\fR using one of the
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\&\s-1\fBOSSL_STORE_INFO\s0\fR\|(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 \s-1NULL.\s0
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The \fBOSSL_STORE_eof_fn\fR and \fBOSSL_STORE_error_fn\fR 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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.Sp
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Note that this function retrieves \fIone\fR data item only.
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.IP "\fBOSSL_STORE_eof_fn\fR" 4
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.IX Item "OSSL_STORE_eof_fn"
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This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR 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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.IP "\fBOSSL_STORE_error_fn\fR" 4
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.IX Item "OSSL_STORE_error_fn"
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This function takes a \fB\s-1OSSL_STORE_LOADER_CTX\s0\fR pointer and is expected to
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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>.
|