Edit File: OSSL_STORE_LOADER.3
.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. Of course, you'll have to process the .\" output yourself in some meaningful fashion. .\" .\" Avoid warning from groff about undefined register 'F'. .de IX .. .nr rF 0 .if \n(.g .if rF .nr rF 1 .if (\n(rF:(\n(.g==0)) \{\ . if \nF \{\ . de IX . tm Index:\\$1\t\\n%\t"\\$2" .. . if !\nF==2 \{\ . nr % 0 . nr F 2 . \} . \} .\} .rr rF .\" .\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). .\" Fear. Run. Save yourself. No user-serviceable parts. . \" fudge factors for nroff and troff .if n \{\ . ds #H 0 . ds #V .8m . ds #F .3m . ds #[ \f1 . ds #] \fP .\} .if t \{\ . ds #H ((1u-(\\\\n(.fu%2u))*.13m) . ds #V .6m . ds #F 0 . ds #[ \& . ds #] \& .\} . \" simple accents for nroff and troff .if n \{\ . ds ' \& . ds ` \& . ds ^ \& . ds , \& . ds ~ ~ . ds / .\} .if t \{\ . ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" . ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' . ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' . ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' . ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' . ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' .\} . \" troff and (daisy-wheel) nroff accents .ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' .ds 8 \h'\*(#H'\(*b\h'-\*(#H' .ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] .ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' .ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' .ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] .ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] .ds ae a\h'-(\w'a'u*4/10)'e .ds Ae A\h'-(\w'A'u*4/10)'E . \" corrections for vroff .if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' .if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' . \" for low resolution devices (crt and lpr) .if \n(.H>23 .if \n(.V>19 \ \{\ . ds : e . ds 8 ss . ds o a . ds d- d\h'-1'\(ga . ds D- D\h'-1'\(hy . ds th \o'bp' . ds Th \o'LP' . ds ae ae . ds Ae AE .\} .rm #[ #] #H #V #F C .\" ======================================================================== .\" .IX Title "OSSL_STORE_LOADER 3" .TH OSSL_STORE_LOADER 3 "2023-09-11" "1.1.1w" "OpenSSL" .\" For nroff, turn off justification. 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>.