194 lines
8 KiB
Text
194 lines
8 KiB
Text
=pod
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=head1 NAME
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UI_new, UI_new_method, UI_free, UI_add_input_string, UI_dup_input_string,
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UI_add_verify_string, UI_dup_verify_string, UI_add_input_boolean,
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UI_dup_input_boolean, UI_add_info_string, UI_dup_info_string,
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UI_add_error_string, UI_dup_error_string, UI_construct_prompt
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UI_add_user_data, UI_get0_user_data, UI_get0_result, UI_process,
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UI_ctrl, UI_set_default_method, UI_get_default_method, UI_get_method,
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UI_set_method, UI_OpenSSL, ERR_load_UI_strings - New User Interface
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=head1 SYNOPSIS
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#include <openssl/ui.h>
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typedef struct ui_st UI;
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typedef struct ui_method_st UI_METHOD;
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UI *UI_new(void);
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UI *UI_new_method(const UI_METHOD *method);
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void UI_free(UI *ui);
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int UI_add_input_string(UI *ui, const char *prompt, int flags,
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char *result_buf, int minsize, int maxsize);
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int UI_dup_input_string(UI *ui, const char *prompt, int flags,
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char *result_buf, int minsize, int maxsize);
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int UI_add_verify_string(UI *ui, const char *prompt, int flags,
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char *result_buf, int minsize, int maxsize, const char *test_buf);
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int UI_dup_verify_string(UI *ui, const char *prompt, int flags,
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char *result_buf, int minsize, int maxsize, const char *test_buf);
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int UI_add_input_boolean(UI *ui, const char *prompt, const char *action_desc,
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const char *ok_chars, const char *cancel_chars,
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int flags, char *result_buf);
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int UI_dup_input_boolean(UI *ui, const char *prompt, const char *action_desc,
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const char *ok_chars, const char *cancel_chars,
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int flags, char *result_buf);
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int UI_add_info_string(UI *ui, const char *text);
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int UI_dup_info_string(UI *ui, const char *text);
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int UI_add_error_string(UI *ui, const char *text);
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int UI_dup_error_string(UI *ui, const char *text);
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/* These are the possible flags. They can be or'ed together. */
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#define UI_INPUT_FLAG_ECHO 0x01
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#define UI_INPUT_FLAG_DEFAULT_PWD 0x02
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char *UI_construct_prompt(UI *ui_method,
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const char *object_desc, const char *object_name);
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void *UI_add_user_data(UI *ui, void *user_data);
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void *UI_get0_user_data(UI *ui);
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const char *UI_get0_result(UI *ui, int i);
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int UI_process(UI *ui);
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int UI_ctrl(UI *ui, int cmd, long i, void *p, void (*f)());
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#define UI_CTRL_PRINT_ERRORS 1
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#define UI_CTRL_IS_REDOABLE 2
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void UI_set_default_method(const UI_METHOD *meth);
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const UI_METHOD *UI_get_default_method(void);
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const UI_METHOD *UI_get_method(UI *ui);
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const UI_METHOD *UI_set_method(UI *ui, const UI_METHOD *meth);
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UI_METHOD *UI_OpenSSL(void);
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=head1 DESCRIPTION
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UI stands for User Interface, and is general purpose set of routines to
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prompt the user for text-based information. Through user-written methods
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(see L<ui_create(3)|ui_create(3)>), prompting can be done in any way
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imaginable, be it plain text prompting, through dialog boxes or from a
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cell phone.
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All the functions work through a context of the type UI. This context
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contains all the information needed to prompt correctly as well as a
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reference to a UI_METHOD, which is an ordered vector of functions that
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carry out the actual prompting.
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The first thing to do is to create a UI with UI_new() or UI_new_method(),
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then add information to it with the UI_add or UI_dup functions. Also,
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user-defined random data can be passed down to the underlying method
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through calls to UI_add_user_data. The default UI method doesn't care
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about these data, but other methods might. Finally, use UI_process()
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to actually perform the prompting and UI_get0_result() to find the result
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to the prompt.
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A UI can contain more than one prompt, which are performed in the given
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sequence. Each prompt gets an index number which is returned by the
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UI_add and UI_dup functions, and has to be used to get the corresponding
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result with UI_get0_result().
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The functions are as follows:
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UI_new() creates a new UI using the default UI method. When done with
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this UI, it should be freed using UI_free().
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UI_new_method() creates a new UI using the given UI method. When done with
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this UI, it should be freed using UI_free().
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UI_OpenSSL() returns the built-in UI method (note: not the default one,
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since the default can be changed. See further on). This method is the
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most machine/OS dependent part of OpenSSL and normally generates the
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most problems when porting.
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UI_free() removes a UI from memory, along with all other pieces of memory
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that's connected to it, like duplicated input strings, results and others.
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UI_add_input_string() and UI_add_verify_string() add a prompt to the UI,
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as well as flags and a result buffer and the desired minimum and maximum
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sizes of the result. The given information is used to prompt for
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information, for example a password, and to verify a password (i.e. having
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the user enter it twice and check that the same string was entered twice).
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UI_add_verify_string() takes and extra argument that should be a pointer
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to the result buffer of the input string that it's supposed to verify, or
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verification will fail.
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UI_add_input_boolean() adds a prompt to the UI that's supposed to be answered
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in a boolean way, with a single character for yes and a different character
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for no. A set of characters that can be used to cancel the prompt is given
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as well. The prompt itself is really divided in two, one part being the
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descriptive text (given through the I<prompt> argument) and one describing
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the possible answers (given through the I<action_desc> argument).
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UI_add_info_string() and UI_add_error_string() add strings that are shown at
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the same time as the prompt for extra information or to show an error string.
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The difference between the two is only conceptual. With the builtin method,
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there's no technical difference between them. Other methods may make a
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difference between them, however.
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The flags currently supported are UI_INPUT_FLAG_ECHO, which is relevant for
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UI_add_input_string() and will have the users response be echoed (when
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prompting for a password, this flag should obviously not be used, and
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UI_INPUT_FLAG_DEFAULT_PWD, which means that a default password of some
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sort will be used (completely depending on the application and the UI
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method).
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UI_dup_input_string(), UI_dup_verify_string(), UI_dup_input_boolean(),
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UI_dup_info_string() and UI_dup_error_string() are basically the same
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as their UI_add counterparts, except that they make their own copies
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of all strings.
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UI_construct_prompt() is a helper function that can be used to create
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a prompt from two pieces of information: an description and a name.
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The default constructor (if there is none provided by the method used)
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creates a string "Enter I<description> for I<name>:". With the
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description "pass phrase" and the file name "foo.key", that becomes
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"Enter pass phrase for foo.key:". Other methods may create whatever
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string and may include encodings that will be processed by the other
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method functions.
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UI_add_user_data() adds a piece of memory for the method to use at any
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time. The builtin UI method doesn't care about this info. Note that several
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calls to this function doesn't add data, it replaces the previous blob
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with the one given as argument.
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UI_get0_user_data() retrieves the data that has last been given to the
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UI with UI_add_user_data().
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UI_get0_result() returns a pointer to the result buffer associated with
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the information indexed by I<i>.
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UI_process() goes through the information given so far, does all the printing
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and prompting and returns.
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UI_ctrl() adds extra control for the application author. For now, it
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understands two commands: UI_CTRL_PRINT_ERRORS, which makes UI_process()
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print the OpenSSL error stack as part of processing the UI, and
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UI_CTRL_IS_REDOABLE, which returns a flag saying if the used UI can
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be used again or not.
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UI_set_default_method() changes the default UI method to the one given.
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UI_get_default_method() returns a pointer to the current default UI method.
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UI_get_method() returns the UI method associated with a given UI.
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UI_set_method() changes the UI method associated with a given UI.
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=head1 SEE ALSO
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L<ui_create(3)|ui_create(3)>, L<ui_compat(3)|ui_compat(3)>
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=head1 HISTORY
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The UI section was first introduced in OpenSSL 0.9.7.
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=head1 AUTHOR
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Richard Levitte (richard@levitte.org) for the OpenSSL project
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(http://www.openssl.org).
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=cut
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