mirror of
https://github.com/openssl/openssl.git
synced 2024-11-27 05:21:51 +08:00
545360c4df
This can be used by engines that need to retain the data for a longer time than just the call where this user data is passed. Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/3575)
222 lines
7.8 KiB
Plaintext
222 lines
7.8 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
UI_METHOD,
|
|
UI_create_method, UI_destroy_method, UI_method_set_opener,
|
|
UI_method_set_writer, UI_method_set_flusher, UI_method_set_reader,
|
|
UI_method_set_closer, UI_method_set_data_duplicator,
|
|
UI_method_set_prompt_constructor, UI_method_set_ex_data,
|
|
UI_method_get_opener, UI_method_get_writer, UI_method_get_flusher,
|
|
UI_method_get_reader, UI_method_get_closer,
|
|
UI_method_get_data_duplicator, UI_method_get_data_destructor,
|
|
UI_method_get_prompt_constructor, UI_method_get_ex_data - user
|
|
interface method creation and destruction
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/ui.h>
|
|
|
|
typedef struct ui_method_st UI_METHOD;
|
|
|
|
UI_METHOD *UI_create_method(const char *name);
|
|
void UI_destroy_method(UI_METHOD *ui_method);
|
|
int UI_method_set_opener(UI_METHOD *method, int (*opener) (UI *ui));
|
|
int UI_method_set_writer(UI_METHOD *method,
|
|
int (*writer) (UI *ui, UI_STRING *uis));
|
|
int UI_method_set_flusher(UI_METHOD *method, int (*flusher) (UI *ui));
|
|
int UI_method_set_reader(UI_METHOD *method,
|
|
int (*reader) (UI *ui, UI_STRING *uis));
|
|
int UI_method_set_closer(UI_METHOD *method, int (*closer) (UI *ui));
|
|
int UI_method_set_data_duplicator(UI_METHOD *method,
|
|
void *(*duplicator) (UI *ui, void *ui_data),
|
|
void (*destructor)(UI *ui, void *ui_data));
|
|
int UI_method_set_prompt_constructor(UI_METHOD *method,
|
|
char *(*prompt_constructor) (UI *ui,
|
|
const char
|
|
*object_desc,
|
|
const char
|
|
*object_name));
|
|
int UI_method_set_ex_data(UI_METHOD *method, int idx, void *data);
|
|
int (*UI_method_get_opener(const UI_METHOD *method)) (UI *);
|
|
int (*UI_method_get_writer(const UI_METHOD *method)) (UI *, UI_STRING *);
|
|
int (*UI_method_get_flusher(const UI_METHOD *method)) (UI *);
|
|
int (*UI_method_get_reader(const UI_METHOD *method)) (UI *, UI_STRING *);
|
|
int (*UI_method_get_closer(const UI_METHOD *method)) (UI *);
|
|
char *(*UI_method_get_prompt_constructor(const UI_METHOD *method))
|
|
(UI *, const char *, const char *);
|
|
void *(*UI_method_get_data_duplicator(const UI_METHOD *method)) (UI *, void *);
|
|
void (*UI_method_get_data_destructor(const UI_METHOD *method)) (UI *, void *);
|
|
const void *UI_method_get_ex_data(const UI_METHOD *method, int idx);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
A method contains a few functions that implement the low level of the
|
|
User Interface.
|
|
These functions are:
|
|
|
|
=over 4
|
|
|
|
=item an opener
|
|
|
|
This function takes a reference to a UI and starts a session, for
|
|
example by opening a channel to a tty, or by creating a dialog box.
|
|
|
|
=item a writer
|
|
|
|
This function takes a reference to a UI and a UI String, and writes
|
|
the string where appropriate, maybe to the tty, maybe added as a field
|
|
label in a dialog box.
|
|
Note that this gets fed all strings associated with a UI, one after
|
|
the other, so care must be taken which ones it actually uses.
|
|
|
|
=item a flusher
|
|
|
|
This function takes a reference to a UI, and flushes everything that
|
|
has been output so far.
|
|
For example, if the method builds up a dialog box, this can be used to
|
|
actually display it and accepting input ended with a pressed button.
|
|
|
|
=item a reader
|
|
|
|
This function takes a reference to a UI and a UI string and reads off
|
|
the given prompt, maybe from the tty, maybe from a field in a dialog
|
|
box.
|
|
Note that this gets fed all strings associated with a UI, one after
|
|
the other, so care must be taken which ones it actually uses.
|
|
|
|
=item a closer
|
|
|
|
This function takes a reference to a UI, and closes the session, maybe
|
|
by closing the channel to the tty, maybe by destroying a dialog box.
|
|
|
|
=back
|
|
|
|
All of these functions are expected to return 0 on error, 1 on
|
|
success, or -1 on out-off-band events, for example if some prompting
|
|
has been cancelled (by pressing Ctrl-C, for example).
|
|
Only the flusher or the reader are expected to return -1.
|
|
If returned by another of the functions, it's treated as if 0 was
|
|
returned.
|
|
|
|
Regarding the writer and the reader, don't assume the former should
|
|
only write and don't assume the latter should only read.
|
|
This depends on the needs of the method.
|
|
|
|
For example, a typical tty reader wouldn't write the prompts in the
|
|
write, but would rather do so in the reader, because of the sequential
|
|
nature of prompting on a tty.
|
|
This is how the UI_OpenSSL() method does it.
|
|
|
|
In contrast, a method that builds up a dialog box would add all prompt
|
|
text in the writer, have all input read in the flusher and store the
|
|
results in some temporary buffer, and finally have the reader just
|
|
fetch those results.
|
|
|
|
The central function that uses these method functions is UI_process(),
|
|
and it does it in five steps:
|
|
|
|
=over 4
|
|
|
|
=item 1.
|
|
|
|
Open the session using the opener function if that one's defined.
|
|
If an error occurs, jump to 5.
|
|
|
|
=item 2.
|
|
|
|
For every UI String associated with the UI, call the writer function
|
|
if that one's defined.
|
|
If an error occurs, jump to 5.
|
|
|
|
=item 3.
|
|
|
|
Flush everything using the flusher function if that one's defined.
|
|
If an error occurs, jump to 5.
|
|
|
|
=item 4.
|
|
|
|
For every UI String associated with the UI, call the reader function
|
|
if that one's defined.
|
|
If an error occurs, jump to 5.
|
|
|
|
=item 5.
|
|
|
|
Close the session using the closer function if that one's defined.
|
|
|
|
=back
|
|
|
|
UI_create_method() creates a new UI method with a given B<name>.
|
|
|
|
UI_destroy_method() destroys the given UI method B<ui_method>.
|
|
|
|
UI_method_set_opener(), UI_method_set_writer(),
|
|
UI_method_set_flusher(), UI_method_set_reader() and
|
|
UI_method_set_closer() set the five main method function to the given
|
|
function pointer.
|
|
|
|
UI_method_set_data_duplicator() sets the user data duplicator and destructor.
|
|
See L<UI_dup_user_data(3)>.
|
|
|
|
UI_method_set_prompt_constructor() sets the prompt constructor.
|
|
See L<UI_construct_prompt(3)>.
|
|
|
|
UI_method_set_ex_data() sets application specific data with a given
|
|
EX_DATA index.
|
|
See L<CRYPTO_get_ex_new_index(3)> for general information on how to
|
|
get that index.
|
|
|
|
UI_method_get_opener(), UI_method_get_writer(),
|
|
UI_method_get_flusher(), UI_method_get_reader(),
|
|
UI_method_get_closer(), UI_method_get_data_duplicator(),
|
|
UI_method_get_data_destructor() and UI_method_get_prompt_constructor()
|
|
return the different method functions.
|
|
|
|
UI_method_get_ex_data() returns the application data previously stored
|
|
with UI_method_set_ex_data().
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
UI_create_method() returns a UI_METHOD pointer on success, NULL on
|
|
error.
|
|
|
|
UI_method_set_opener(), UI_method_set_writer(),
|
|
UI_method_set_flusher(), UI_method_set_reader(),
|
|
UI_method_set_closer(), UI_method_set_data_duplicator() and
|
|
UI_method_set_prompt_constructor()
|
|
return 0 on success, -1 if the given B<method> is NULL.
|
|
|
|
UI_method_set_ex_data() returns 1 on success and 0 on error (because
|
|
CRYPTO_set_ex_data() does so).
|
|
|
|
UI_method_get_opener(), UI_method_get_writer(),
|
|
UI_method_get_flusher(), UI_method_get_reader(),
|
|
UI_method_get_closer(), UI_method_get_data_duplicator(),
|
|
UI_method_get_data_destructor() and UI_method_get_prompt_constructor()
|
|
return the requested function pointer if it's set in the method,
|
|
otherwise NULL.
|
|
|
|
UI_method_get_ex_data() returns a pointer to the application specific
|
|
data associated with the method.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<UI(3)>, L<CRYPTO_get_ex_data(3)>, L<UI_STRING(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
UI_method_set_data_duplicator(), UI_method_get_data_duplicator() and
|
|
UI_method_get_data_destructor()
|
|
were added in OpenSSL 1.1.1.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2001-2016 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
|