345 lines
13 KiB
Groff
345 lines
13 KiB
Groff
.\" $NetBSD: openssl_ui.3,v 1.8 2007/11/27 22:19:55 christos Exp $
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.\" ========================================================================
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.\"
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.IX Title "ui 3"
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.TH ui 3 "2004-03-19" "0.9.8e" "OpenSSL"
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.SH "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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.SH "LIBRARY"
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libcrypto, -lcrypto
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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ui.h>
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.Ve
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.PP
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.Vb 2
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\& typedef struct ui_st UI;
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\& typedef struct ui_method_st UI_METHOD;
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.Ve
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.PP
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.Vb 3
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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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.Ve
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.PP
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.Vb 18
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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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.Ve
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.PP
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.Vb 3
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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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.Ve
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.PP
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.Vb 2
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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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.Ve
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.PP
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.Vb 2
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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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.Ve
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.PP
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.Vb 1
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\& const char *UI_get0_result(UI *ui, int i);
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.Ve
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.PP
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.Vb 1
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\& int UI_process(UI *ui);
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.Ve
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.PP
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.Vb 3
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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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.Ve
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.PP
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.Vb 4
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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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.Ve
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.PP
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.Vb 1
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\& UI_METHOD *UI_OpenSSL(void);
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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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\&\s-1UI\s0 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 \fIui_create\fR\|(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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.PP
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All the functions work through a context of the type \s-1UI\s0. 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 \s-1UI_METHOD\s0, which is an ordered vector of functions that
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carry out the actual prompting.
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.PP
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The first thing to do is to create a \s-1UI\s0 with \fIUI_new()\fR or \fIUI_new_method()\fR,
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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 \s-1UI\s0 method doesn't care
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about these data, but other methods might. Finally, use \fIUI_process()\fR
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to actually perform the prompting and \fIUI_get0_result()\fR to find the result
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to the prompt.
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.PP
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A \s-1UI\s0 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 \fIUI_get0_result()\fR.
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.PP
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The functions are as follows:
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.PP
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\&\fIUI_new()\fR creates a new \s-1UI\s0 using the default \s-1UI\s0 method. When done with
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this \s-1UI\s0, it should be freed using \fIUI_free()\fR.
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.PP
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\&\fIUI_new_method()\fR creates a new \s-1UI\s0 using the given \s-1UI\s0 method. When done with
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this \s-1UI\s0, it should be freed using \fIUI_free()\fR.
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.PP
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\&\fIUI_OpenSSL()\fR returns the built-in \s-1UI\s0 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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.PP
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\&\fIUI_free()\fR removes a \s-1UI\s0 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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.PP
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\&\fIUI_add_input_string()\fR and \fIUI_add_verify_string()\fR add a prompt to the \s-1UI\s0,
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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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\&\fIUI_add_verify_string()\fR 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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.PP
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\&\fIUI_add_input_boolean()\fR adds a prompt to the \s-1UI\s0 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 \fIprompt\fR argument) and one describing
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the possible answers (given through the \fIaction_desc\fR argument).
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.PP
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\&\fIUI_add_info_string()\fR and \fIUI_add_error_string()\fR 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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.PP
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The flags currently supported are \s-1UI_INPUT_FLAG_ECHO\s0, which is relevant for
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\&\fIUI_add_input_string()\fR 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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\&\s-1UI_INPUT_FLAG_DEFAULT_PWD\s0, which means that a default password of some
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sort will be used (completely depending on the application and the \s-1UI\s0
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method).
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.PP
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\&\fIUI_dup_input_string()\fR, \fIUI_dup_verify_string()\fR, \fIUI_dup_input_boolean()\fR,
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\&\fIUI_dup_info_string()\fR and \fIUI_dup_error_string()\fR 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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.PP
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\&\fIUI_construct_prompt()\fR 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 \fIdescription\fR for \fIname\fR:\*(L". With the
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description \*(R"pass phrase\*(L" and the file name \*(R"foo.key\*(L", that becomes
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\&\*(R"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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.PP
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\&\fIUI_add_user_data()\fR adds a piece of memory for the method to use at any
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time. The builtin \s-1UI\s0 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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.PP
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\&\fIUI_get0_user_data()\fR retrieves the data that has last been given to the
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\&\s-1UI\s0 with \fIUI_add_user_data()\fR.
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.PP
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\&\fIUI_get0_result()\fR returns a pointer to the result buffer associated with
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the information indexed by \fIi\fR.
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.PP
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\&\fIUI_process()\fR goes through the information given so far, does all the printing
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and prompting and returns.
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.PP
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\&\fIUI_ctrl()\fR adds extra control for the application author. For now, it
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understands two commands: \s-1UI_CTRL_PRINT_ERRORS\s0, which makes \fIUI_process()\fR
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print the OpenSSL error stack as part of processing the \s-1UI\s0, and
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\&\s-1UI_CTRL_IS_REDOABLE\s0, which returns a flag saying if the used \s-1UI\s0 can
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be used again or not.
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.PP
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\&\fIUI_set_default_method()\fR changes the default \s-1UI\s0 method to the one given.
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.PP
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\&\fIUI_get_default_method()\fR returns a pointer to the current default \s-1UI\s0 method.
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.PP
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\&\fIUI_get_method()\fR returns the \s-1UI\s0 method associated with a given \s-1UI\s0.
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.PP
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\&\fIUI_set_method()\fR changes the \s-1UI\s0 method associated with a given \s-1UI\s0.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIui_create\fR\|(3), \fIui_compat\fR\|(3)
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.SH "HISTORY"
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.IX Header "HISTORY"
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The \s-1UI\s0 section was first introduced in OpenSSL 0.9.7.
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.SH "AUTHOR"
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.IX Header "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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