1ui(3)                               OpenSSL                              ui(3)
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NAME

6       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_get0_user_data,
11       UI_get0_result, UI_process, UI_ctrl, UI_set_default_method,
12       UI_get_default_method, UI_get_method, UI_set_method, UI_OpenSSL,
13       ERR_load_UI_strings - New User Interface
14

SYNOPSIS

16        #include <openssl/ui.h>
17
18        typedef struct ui_st UI;
19        typedef struct ui_method_st UI_METHOD;
20
21        UI *UI_new(void);
22        UI *UI_new_method(const UI_METHOD *method);
23        void UI_free(UI *ui);
24
25        int UI_add_input_string(UI *ui, const char *prompt, int flags,
26               char *result_buf, int minsize, int maxsize);
27        int UI_dup_input_string(UI *ui, const char *prompt, int flags,
28               char *result_buf, int minsize, int maxsize);
29        int UI_add_verify_string(UI *ui, const char *prompt, int flags,
30               char *result_buf, int minsize, int maxsize, 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, const char *test_buf);
33        int UI_add_input_boolean(UI *ui, const char *prompt, const char *action_desc,
34               const char *ok_chars, const char *cancel_chars,
35               int flags, char *result_buf);
36        int UI_dup_input_boolean(UI *ui, const char *prompt, const char *action_desc,
37               const char *ok_chars, const char *cancel_chars,
38               int flags, char *result_buf);
39        int UI_add_info_string(UI *ui, const char *text);
40        int UI_dup_info_string(UI *ui, const char *text);
41        int UI_add_error_string(UI *ui, const char *text);
42        int UI_dup_error_string(UI *ui, const char *text);
43
44        /* These are the possible flags.  They can be or'ed together. */
45        #define UI_INPUT_FLAG_ECHO             0x01
46        #define UI_INPUT_FLAG_DEFAULT_PWD      0x02
47
48        char *UI_construct_prompt(UI *ui_method,
49               const char *object_desc, const char *object_name);
50
51        void *UI_add_user_data(UI *ui, void *user_data);
52        void *UI_get0_user_data(UI *ui);
53
54        const char *UI_get0_result(UI *ui, int i);
55
56        int UI_process(UI *ui);
57
58        int UI_ctrl(UI *ui, int cmd, long i, void *p, void (*f)());
59        #define UI_CTRL_PRINT_ERRORS           1
60        #define UI_CTRL_IS_REDOABLE            2
61
62        void UI_set_default_method(const UI_METHOD *meth);
63        const UI_METHOD *UI_get_default_method(void);
64        const UI_METHOD *UI_get_method(UI *ui);
65        const UI_METHOD *UI_set_method(UI *ui, const UI_METHOD *meth);
66
67        UI_METHOD *UI_OpenSSL(void);
68

DESCRIPTION

70       UI stands for User Interface, and is general purpose set of routines to
71       prompt the user for text-based information.  Through user-written
72       methods (see ui_create(3)), prompting can be done in any way
73       imaginable, be it plain text prompting, through dialog boxes or from a
74       cell phone.
75
76       All the functions work through a context of the type UI.  This context
77       contains all the information needed to prompt correctly as well as a
78       reference to a UI_METHOD, which is an ordered vector of functions that
79       carry out the actual prompting.
80
81       The first thing to do is to create a UI with UI_new() or
82       UI_new_method(), then add information to it with the UI_add or UI_dup
83       functions.  Also, user-defined random data can be passed down to the
84       underlying method through calls to UI_add_user_data.  The default UI
85       method doesn't care about these data, but other methods might.
86       Finally, use UI_process() to actually perform the prompting and
87       UI_get0_result() to find the result to the prompt.
88
89       A UI can contain more than one prompt, which are performed in the given
90       sequence.  Each prompt gets an index number which is returned by the
91       UI_add and UI_dup functions, and has to be used to get the
92       corresponding result with UI_get0_result().
93
94       The functions are as follows:
95
96       UI_new() creates a new UI using the default UI method.  When done with
97       this UI, it should be freed using UI_free().
98
99       UI_new_method() creates a new UI using the given UI method.  When done
100       with this UI, it should be freed using UI_free().
101
102       UI_OpenSSL() returns the built-in UI method (note: not the default one,
103       since the default can be changed.  See further on).  This method is the
104       most machine/OS dependent part of OpenSSL and normally generates the
105       most problems when porting.
106
107       UI_free() removes a UI from memory, along with all other pieces of
108       memory that's connected to it, like duplicated input strings, results
109       and others.
110
111       UI_add_input_string() and UI_add_verify_string() add a prompt to the
112       UI, as well as flags and a result buffer and the desired minimum and
113       maximum sizes of the result, not counting the final NUL character.  The
114       given information is used to prompt for information, for example a
115       password, and to verify a password (i.e. having the user enter it twice
116       and check that the same string was entered twice).
117       UI_add_verify_string() takes and extra argument that should be a
118       pointer to the result buffer of the input string that it's supposed to
119       verify, or verification will fail.
120
121       UI_add_input_boolean() adds a prompt to the UI that's supposed to be
122       answered in a boolean way, with a single character for yes and a
123       different character for no.  A set of characters that can be used to
124       cancel the prompt is given as well.  The prompt itself is divided in
125       two, one part being the descriptive text (given through the prompt
126       argument) and one describing the possible answers (given through the
127       action_desc argument).
128
129       UI_add_info_string() and UI_add_error_string() add strings that are
130       shown at the same time as the prompt for extra information or to show
131       an error string.  The difference between the two is only conceptual.
132       With the builtin method, there's no technical difference between them.
133       Other methods may make a difference between them, however.
134
135       The flags currently supported are UI_INPUT_FLAG_ECHO, which is relevant
136       for UI_add_input_string() and will have the users response be echoed
137       (when prompting for a password, this flag should obviously not be used,
138       and UI_INPUT_FLAG_DEFAULT_PWD, which means that a default password of
139       some sort will be used (completely depending on the application and the
140       UI method).
141
142       UI_dup_input_string(), UI_dup_verify_string(), UI_dup_input_boolean(),
143       UI_dup_info_string() and UI_dup_error_string() are basically the same
144       as their UI_add counterparts, except that they make their own copies of
145       all strings.
146
147       UI_construct_prompt() is a helper function that can be used to create a
148       prompt from two pieces of information: an description and a name.  The
149       default constructor (if there is none provided by the method used)
150       creates a string "Enter description for name:".  With the description
151       "pass phrase" and the file name "foo.key", that becomes "Enter pass
152       phrase for foo.key:".  Other methods may create whatever string and may
153       include encodings that will be processed by the other method functions.
154
155       UI_add_user_data() adds a piece of memory for the method to use at any
156       time.  The builtin UI method doesn't care about this info.  Note that
157       several calls to this function doesn't add data, it replaces the
158       previous blob with the one given as argument.
159
160       UI_get0_user_data() retrieves the data that has last been given to the
161       UI with UI_add_user_data().
162
163       UI_get0_result() returns a pointer to the result buffer associated with
164       the information indexed by i.
165
166       UI_process() goes through the information given so far, does all the
167       printing and prompting and returns.
168
169       UI_ctrl() adds extra control for the application author.  For now, it
170       understands two commands: UI_CTRL_PRINT_ERRORS, which makes
171       UI_process() print the OpenSSL error stack as part of processing the
172       UI, and UI_CTRL_IS_REDOABLE, which returns a flag saying if the used UI
173       can be used again or not.
174
175       UI_set_default_method() changes the default UI method to the one given.
176
177       UI_get_default_method() returns a pointer to the current default UI
178       method.
179
180       UI_get_method() returns the UI method associated with a given UI.
181
182       UI_set_method() changes the UI method associated with a given UI.
183

SEE ALSO

185       ui_create(3), ui_compat(3)
186

HISTORY

188       The UI section was first introduced in OpenSSL 0.9.7.
189

AUTHOR

191       Richard Levitte (richard@levitte.org) for the OpenSSL project
192       (http://www.openssl.org).
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1961.0.2o                            2018-03-27                             ui(3)
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