1UI_NEW(3) OpenSSL UI_NEW(3)
2
6 UI, UI_new, UI_new_method, UI_free, UI_add_input_string,
7 UI_dup_input_string, UI_add_verify_string, UI_dup_verify_string,
8 UI_add_input_boolean, UI_dup_input_boolean, UI_add_info_string,
9 UI_dup_info_string, UI_add_error_string, UI_dup_error_string,
10 UI_construct_prompt, UI_add_user_data, UI_dup_user_data,
11 UI_get0_user_data, UI_get0_result, UI_get_result_length, UI_process,
12 UI_ctrl, UI_set_default_method, UI_get_default_method, UI_get_method,
13 UI_set_method, UI_OpenSSL, UI_null - user interface
14
16 #include <openssl/ui.h>
17 typedef struct ui_st UI;
19 UI *UI_new(void);
21 UI *UI_new_method(const UI_METHOD *method);
22 void UI_free(UI *ui);
23 int UI_add_input_string(UI *ui, const char *prompt, int flags,
25 char *result_buf, int minsize, int maxsize);
26 int UI_dup_input_string(UI *ui, const char *prompt, int flags,
27 char *result_buf, int minsize, int maxsize);
28 int UI_add_verify_string(UI *ui, const char *prompt, int flags,
29 char *result_buf, int minsize, int maxsize,
30 const char *test_buf);
31 int UI_dup_verify_string(UI *ui, const char *prompt, int flags,
32 char *result_buf, int minsize, int maxsize,
33 const char *test_buf);
34 int UI_add_input_boolean(UI *ui, const char *prompt, const char *action_desc,
35 const char *ok_chars, const char *cancel_chars,
36 int flags, char *result_buf);
37 int UI_dup_input_boolean(UI *ui, const char *prompt, const char *action_desc,
38 const char *ok_chars, const char *cancel_chars,
39 int flags, char *result_buf);
40 int UI_add_info_string(UI *ui, const char *text);
41 int UI_dup_info_string(UI *ui, const char *text);
42 int UI_add_error_string(UI *ui, const char *text);
43 int UI_dup_error_string(UI *ui, const char *text);
44 char *UI_construct_prompt(UI *ui_method,
46 const char *object_desc, const char *object_name);
47 void *UI_add_user_data(UI *ui, void *user_data);
49 int UI_dup_user_data(UI *ui, void *user_data);
50 void *UI_get0_user_data(UI *ui);
51 const char *UI_get0_result(UI *ui, int i);
53 int UI_get_result_length(UI *ui, int i);
54 int UI_process(UI *ui);
56 int UI_ctrl(UI *ui, int cmd, long i, void *p, void (*f)());
58 void UI_set_default_method(const UI_METHOD *meth);
60 const UI_METHOD *UI_get_default_method(void);
61 const UI_METHOD *UI_get_method(UI *ui);
62 const UI_METHOD *UI_set_method(UI *ui, const UI_METHOD *meth);
63 UI_METHOD *UI_OpenSSL(void);
65 const UI_METHOD *UI_null(void);
66
68 UI stands for User Interface, and is general purpose set of routines to
69 prompt the user for text-based information. Through user-written
70 methods (see UI_create_method(3)), prompting can be done in any way
71 imaginable, be it plain text prompting, through dialog boxes or from a
72 cell phone.
73 All the functions work through a context of the type UI. This context
75 contains all the information needed to prompt correctly as well as a
76 reference to a UI_METHOD, which is an ordered vector of functions that
77 carry out the actual prompting.
78 The first thing to do is to create a UI with UI_new() or
80 UI_new_method(), then add information to it with the UI_add or UI_dup
81 functions. Also, user-defined random data can be passed down to the
82 underlying method through calls to UI_add_user_data() or
83 UI_dup_user_data(). The default UI method doesn't care about these
84 data, but other methods might. Finally, use UI_process() to actually
85 perform the prompting and UI_get0_result() and UI_get_result_length()
86 to find the result to the prompt and its length.
87 A UI can contain more than one prompt, which are performed in the given
89 sequence. Each prompt gets an index number which is returned by the
90 UI_add and UI_dup functions, and has to be used to get the
91 corresponding result with UI_get0_result() and UI_get_result_length().
92 UI_process() can be called more than once on the same UI, thereby
94 allowing a UI to have a long lifetime, but can just as well have a
95 short lifetime.
96 The functions are as follows:
98 UI_new() creates a new UI using the default UI method. When done with
100 this UI, it should be freed using UI_free().
101 UI_new_method() creates a new UI using the given UI method. When done
103 with this UI, it should be freed using UI_free().
104 UI_OpenSSL() returns the built-in UI method (note: not necessarily the
106 default one, since the default can be changed. See further on). This
107 method is the most machine/OS dependent part of OpenSSL and normally
108 generates the most problems when porting.
109 UI_null() returns a UI method that does nothing. Its use is to avoid
111 getting internal defaults for passed UI_METHOD pointers.
112 UI_free() removes a UI from memory, along with all other pieces of
114 memory that's connected to it, like duplicated input strings, results
115 and others. If ui is NULL nothing is done.
116 UI_add_input_string() and UI_add_verify_string() add a prompt to the
118 UI, as well as flags and a result buffer and the desired minimum and
119 maximum sizes of the result, not counting the final NUL character. The
120 given information is used to prompt for information, for example a
121 password, and to verify a password (i.e. having the user enter it twice
122 and check that the same string was entered twice).
123 UI_add_verify_string() takes and extra argument that should be a
124 pointer to the result buffer of the input string that it's supposed to
125 verify, or verification will fail.
126 UI_add_input_boolean() adds a prompt to the UI that's supposed to be
128 answered in a boolean way, with a single character for yes and a
129 different character for no. A set of characters that can be used to
130 cancel the prompt is given as well. The prompt itself is divided in
131 two, one part being the descriptive text (given through the prompt
132 argument) and one describing the possible answers (given through the
133 action_desc argument).
134 UI_add_info_string() and UI_add_error_string() add strings that are
136 shown at the same time as the prompt for extra information or to show
137 an error string. The difference between the two is only conceptual.
138 With the builtin method, there's no technical difference between them.
139 Other methods may make a difference between them, however.
140 The flags currently supported are UI_INPUT_FLAG_ECHO, which is relevant
142 for UI_add_input_string() and will have the users response be echoed
143 (when prompting for a password, this flag should obviously not be used,
144 and UI_INPUT_FLAG_DEFAULT_PWD, which means that a default password of
145 some sort will be used (completely depending on the application and the
146 UI method).
147 UI_dup_input_string(), UI_dup_verify_string(), UI_dup_input_boolean(),
149 UI_dup_info_string() and UI_dup_error_string() are basically the same
150 as their UI_add counterparts, except that they make their own copies of
151 all strings.
152 UI_construct_prompt() is a helper function that can be used to create a
154 prompt from two pieces of information: an description and a name. The
155 default constructor (if there is none provided by the method used)
156 creates a string "Enter description for name:". With the description
157 "pass phrase" and the filename "foo.key", that becomes "Enter pass
158 phrase for foo.key:". Other methods may create whatever string and may
159 include encodings that will be processed by the other method functions.
160 UI_add_user_data() adds a user data pointer for the method to use at
162 any time. The builtin UI method doesn't care about this info. Note
163 that several calls to this function doesn't add data, it replaces the
164 previous blob with the one given as argument.
165 UI_dup_user_data() duplicates the user data and works as an alternative
167 to UI_add_user_data() when the user data needs to be preserved for a
168 longer duration, perhaps even the lifetime of the application. The UI
169 object takes ownership of this duplicate and will free it whenever it
170 gets replaced or the UI is destroyed. UI_dup_user_data() returns 0 on
171 success, or -1 on memory allocation failure or if the method doesn't
172 have a duplicator function.
173 UI_get0_user_data() retrieves the data that has last been given to the
175 UI with UI_add_user_data() or UI_dup_user_data.
176 UI_get0_result() returns a pointer to the result buffer associated with
178 the information indexed by i.
179 UI_get_result_length() returns the length of the result buffer
181 associated with the information indexed by i.
182 UI_process() goes through the information given so far, does all the
184 printing and prompting and returns the final status, which is -2 on
185 out-of-band events (Interrupt, Cancel, ...), -1 on error and 0 on
186 success.
187 UI_ctrl() adds extra control for the application author. For now, it
189 understands two commands: UI_CTRL_PRINT_ERRORS, which makes
190 UI_process() print the OpenSSL error stack as part of processing the
191 UI, and UI_CTRL_IS_REDOABLE, which returns a flag saying if the used UI
192 can be used again or not.
193 UI_set_default_method() changes the default UI method to the one given.
195 This function is not thread-safe and should not be called at the same
196 time as other OpenSSL functions.
197 UI_get_default_method() returns a pointer to the current default UI
199 method.
200 UI_get_method() returns the UI method associated with a given UI.
202 UI_set_method() changes the UI method associated with a given UI.
204
206 The resulting strings that the built in method UI_OpenSSL() generate
207 are assumed to be encoded according to the current locale or (for
208 Windows) code page. For applications having different demands, these
209 strings need to be converted appropriately by the caller. For Windows,
210 if the OPENSSL_WIN32_UTF8 environment variable is set, the built-in
211 method UI_OpenSSL() will produce UTF-8 encoded strings instead.
212
214 UI_new() and UI_new_method() return a valid UI structure or NULL if an
215 error occurred.
216 UI_add_input_string(), UI_dup_input_string(), UI_add_verify_string(),
218 UI_dup_verify_string(), UI_add_input_boolean(), UI_dup_input_boolean(),
219 UI_add_info_string(), UI_dup_info_string(), UI_add_error_string() and
220 UI_dup_error_string() return a positive number on success or a value
221 which is less than or equal to 0 otherwise.
222 UI_construct_prompt() returns a string or NULL if an error occurred.
224 UI_dup_user_data() returns 0 on success or -1 on error.
226 UI_get0_result() returns a string or NULL on error.
228 UI_get_result_length() returns a positive integer or 0 on success;
230 otherwise it returns -1 on error.
231 UI_process() returns 0 on success or a negative value on error.
233 UI_ctrl() returns a mask on success or -1 on error.
235 UI_get_default_method(), UI_get_method(), UI_OpenSSL(), UI_null() and
237 UI_set_method() return either a valid UI_METHOD structure or NULL
238 respectively.
239
241 The UI_dup_user_data() function was added in OpenSSL 1.1.1.
242
244 Copyright 2001-2020 The OpenSSL Project Authors. All Rights Reserved.
245 Licensed under the OpenSSL license (the "License"). You may not use
247 this file except in compliance with the License. You can obtain a copy
248 in the file LICENSE in the source distribution or at
249 <https://www.openssl.org/source/license.html>.
2501.1.1l 2021-09-15 UI_NEW(3)