=head1 NAME
-UI, UI_METHOD,
+UI,
UI_new, UI_new_method, UI_free, UI_add_input_string, UI_dup_input_string,
UI_add_verify_string, UI_dup_verify_string, UI_add_input_boolean,
UI_dup_input_boolean, UI_add_info_string, UI_dup_info_string,
UI_add_error_string, UI_dup_error_string, UI_construct_prompt,
-UI_add_user_data, UI_get0_user_data, UI_get0_result, UI_process,
-UI_ctrl, UI_set_default_method, UI_get_default_method, UI_get_method,
-UI_set_method, UI_OpenSSL, - user interface
+UI_add_user_data, UI_dup_user_data, UI_get0_user_data, UI_get0_result,
+UI_get_result_length,
+UI_process, UI_ctrl, UI_set_default_method, UI_get_default_method,
+UI_get_method, UI_set_method, UI_OpenSSL, UI_null - user interface
=head1 SYNOPSIS
#include <openssl/ui.h>
typedef struct ui_st UI;
- typedef struct ui_method_st UI_METHOD;
UI *UI_new(void);
UI *UI_new_method(const UI_METHOD *method);
void UI_free(UI *ui);
int UI_add_input_string(UI *ui, const char *prompt, int flags,
- char *result_buf, int minsize, int maxsize);
+ char *result_buf, int minsize, int maxsize);
int UI_dup_input_string(UI *ui, const char *prompt, int flags,
- char *result_buf, int minsize, int maxsize);
+ char *result_buf, int minsize, int maxsize);
int UI_add_verify_string(UI *ui, const char *prompt, int flags,
- char *result_buf, int minsize, int maxsize, const char *test_buf);
+ char *result_buf, int minsize, int maxsize,
+ const char *test_buf);
int UI_dup_verify_string(UI *ui, const char *prompt, int flags,
- char *result_buf, int minsize, int maxsize, const char *test_buf);
+ char *result_buf, int minsize, int maxsize,
+ const char *test_buf);
int UI_add_input_boolean(UI *ui, const char *prompt, const char *action_desc,
- const char *ok_chars, const char *cancel_chars,
- int flags, char *result_buf);
+ const char *ok_chars, const char *cancel_chars,
+ int flags, char *result_buf);
int UI_dup_input_boolean(UI *ui, const char *prompt, const char *action_desc,
- const char *ok_chars, const char *cancel_chars,
- int flags, char *result_buf);
+ const char *ok_chars, const char *cancel_chars,
+ int flags, char *result_buf);
int UI_add_info_string(UI *ui, const char *text);
int UI_dup_info_string(UI *ui, const char *text);
int UI_add_error_string(UI *ui, const char *text);
const char *object_desc, const char *object_name);
void *UI_add_user_data(UI *ui, void *user_data);
+ int UI_dup_user_data(UI *ui, void *user_data);
void *UI_get0_user_data(UI *ui);
const char *UI_get0_result(UI *ui, int i);
+ int UI_get_result_length(UI *ui, int i);
int UI_process(UI *ui);
const UI_METHOD *UI_set_method(UI *ui, const UI_METHOD *meth);
UI_METHOD *UI_OpenSSL(void);
+ const UI_METHOD *UI_null(void);
=head1 DESCRIPTION
UI stands for User Interface, and is general purpose set of routines to
prompt the user for text-based information. Through user-written methods
-(see L<ui_create(3)>), prompting can be done in any way
+(see L<UI_create_method(3)>), prompting can be done in any way
imaginable, be it plain text prompting, through dialog boxes or from a
cell phone.
The first thing to do is to create a UI with UI_new() or UI_new_method(),
then add information to it with the UI_add or UI_dup functions. Also,
user-defined random data can be passed down to the underlying method
-through calls to UI_add_user_data. The default UI method doesn't care
-about these data, but other methods might. Finally, use UI_process()
-to actually perform the prompting and UI_get0_result() to find the result
-to the prompt.
+through calls to UI_add_user_data() or UI_dup_user_data(). The default
+UI method doesn't care about these data, but other methods might. Finally,
+use UI_process() to actually perform the prompting and UI_get0_result()
+and UI_get_result_length() to find the result to the prompt and its length.
A UI can contain more than one prompt, which are performed in the given
sequence. Each prompt gets an index number which is returned by the
UI_add and UI_dup functions, and has to be used to get the corresponding
-result with UI_get0_result().
+result with UI_get0_result() and UI_get_result_length().
+
+UI_process() can be called more than once on the same UI, thereby allowing
+a UI to have a long lifetime, but can just as well have a short lifetime.
The functions are as follows:
UI_new_method() creates a new UI using the given UI method. When done with
this UI, it should be freed using UI_free().
-UI_OpenSSL() returns the built-in UI method (note: not the default one,
-since the default can be changed. See further on). This method is the
-most machine/OS dependent part of OpenSSL and normally generates the
-most problems when porting.
+UI_OpenSSL() returns the built-in UI method (note: not necessarely the
+default one, since the default can be changed. See further on). This
+method is the most machine/OS dependent part of OpenSSL and normally
+generates the most problems when porting.
+
+UI_null() returns a UI method that does nothing. Its use is to avoid
+getting internal defaults for passed UI_METHOD pointers.
UI_free() removes a UI from memory, along with all other pieces of memory
that's connected to it, like duplicated input strings, results and others.
string and may include encodings that will be processed by the other
method functions.
-UI_add_user_data() adds a piece of memory for the method to use at any
+UI_add_user_data() adds a user data pointer for the method to use at any
time. The builtin UI method doesn't care about this info. Note that several
calls to this function doesn't add data, it replaces the previous blob
with the one given as argument.
+UI_dup_user_data() duplicates the user data and works as an alternative
+to UI_add_user_data() when the user data needs to be preserved for a longer
+duration, perhaps even the lifetime of the application. The UI object takes
+ownership of this duplicate and will free it whenever it gets replaced or
+the UI is destroyed. UI_dup_user_data() returns 0 on success, or -1 on memory
+allocation failure or if the method doesn't have a duplicator function.
+
UI_get0_user_data() retrieves the data that has last been given to the
-UI with UI_add_user_data().
+UI with UI_add_user_data() or UI_dup_user_data.
UI_get0_result() returns a pointer to the result buffer associated with
the information indexed by I<i>.
+UI_get_result_length() returns the length of the result buffer associated with
+the information indexed by I<i>.
+
UI_process() goes through the information given so far, does all the printing
-and prompting and returns.
+and prompting and returns the final status, which is -2 on out-of-band events
+(Interrupt, Cancel, ...), -1 on error and 0 on success.
UI_ctrl() adds extra control for the application author. For now, it
understands two commands: B<UI_CTRL_PRINT_ERRORS>, which makes UI_process()
be used again or not.
UI_set_default_method() changes the default UI method to the one given.
+This function is not thread-safe and should not be called at the same time
+as other OpenSSL functions.
UI_get_default_method() returns a pointer to the current default UI method.
UI_set_method() changes the UI method associated with a given UI.
-UI_OpenSSL() is the default OpenSSL UI method for prompting
-passphrases on the command line.
+=head1 NOTES
+
+The resulting strings that the built in method UI_OpenSSL() generate
+are assumed to be encoded according to the current locale or (for
+Windows) code page.
+For applications having different demands, these strings need to be
+converted appropriately by the caller.
+For Windows, if the OPENSSL_WIN32_UTF8 environment variable is set,
+the built-in method UI_OpenSSL() will produce UTF-8 encoded strings
+instead.
+
+=head1 HISTORY
+
+UI_dup_user_data()
+was added in OpenSSL 1.1.1.
=head1 COPYRIGHT
-Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2001-2017 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