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/*
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* Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef HEADER_UI_H
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# define HEADER_UI_H
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# include <openssl/opensslconf.h>
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# if OPENSSL_API_COMPAT < 0x10100000L
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# include <openssl/crypto.h>
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# endif
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# include <openssl/safestack.h>
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# include <openssl/pem.h>
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# include <openssl/ossl_typ.h>
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# include <openssl/uierr.h>
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/* For compatibility reasons, the macro OPENSSL_NO_UI is currently retained */
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# if OPENSSL_API_COMPAT < 0x10200000L
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# ifdef OPENSSL_NO_UI_CONSOLE
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# define OPENSSL_NO_UI
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# endif
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# endif
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# ifdef __cplusplus
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extern "C" {
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# endif
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/*
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* All the following functions return -1 or NULL on error and in some cases
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* (UI_process()) -2 if interrupted or in some other way cancelled. When
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* everything is fine, they return 0, a positive value or a non-NULL pointer,
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* all depending on their purpose.
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*/
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/* Creators and destructor. */
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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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/*-
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The following functions are used to add strings to be printed and prompt
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strings to prompt for data. The names are UI_{add,dup}_<function>_string
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and UI_{add,dup}_input_boolean.
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UI_{add,dup}_<function>_string have the following meanings:
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add add a text or prompt string. The pointers given to these
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functions are used verbatim, no copying is done.
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dup make a copy of the text or prompt string, then add the copy
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to the collection of strings in the user interface.
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<function>
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The function is a name for the functionality that the given
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string shall be used for. It can be one of:
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input use the string as data prompt.
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verify use the string as verification prompt. This
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is used to verify a previous input.
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info use the string for informational output.
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error use the string for error output.
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Honestly, there's currently no difference between info and error for the
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moment.
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UI_{add,dup}_input_boolean have the same semantics for "add" and "dup",
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and are typically used when one wants to prompt for a yes/no response.
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All of the functions in this group take a UI and a prompt string.
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The string input and verify addition functions also take a flag argument,
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a buffer for the result to end up with, a minimum input size and a maximum
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input size (the result buffer MUST be large enough to be able to contain
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the maximum number of characters). Additionally, the verify addition
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functions takes another buffer to compare the result against.
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The boolean input functions take an action description string (which should
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be safe to ignore if the expected user action is obvious, for example with
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a dialog box with an OK button and a Cancel button), a string of acceptable
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characters to mean OK and to mean Cancel. The two last strings are checked
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to make sure they don't have common characters. Additionally, the same
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flag argument as for the string input is taken, as well as a result buffer.
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The result buffer is required to be at least one byte long. Depending on
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the answer, the first character from the OK or the Cancel character strings
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will be stored in the first byte of the result buffer. No NUL will be
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added, so the result is *not* a string.
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On success, the all return an index of the added information. That index
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is useful when retrieving results with UI_get0_result(). */
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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,
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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,
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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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/* Use to have echoing of input */
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# define UI_INPUT_FLAG_ECHO 0x01
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/*
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* Use a default password. Where that password is found is completely up to
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* the application, it might for example be in the user data set with
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* UI_add_user_data(). It is not recommended to have more than one input in
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* each UI being marked with this flag, or the application might get
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* confused.
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*/
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# define UI_INPUT_FLAG_DEFAULT_PWD 0x02
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/*-
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* The user of these routines may want to define flags of their own. The core
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* UI won't look at those, but will pass them on to the method routines. They
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* must use higher bits so they don't get confused with the UI bits above.
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* UI_INPUT_FLAG_USER_BASE tells which is the lowest bit to use. A good
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* example of use is this:
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*
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* #define MY_UI_FLAG1 (0x01 << UI_INPUT_FLAG_USER_BASE)
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*
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*/
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# define UI_INPUT_FLAG_USER_BASE 16
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/*-
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* The following function helps construct a prompt. object_desc is a
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* textual short description of the object, for example "pass phrase",
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* and object_name is the name of the object (might be a card name or
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* a file name.
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* The returned string shall always be allocated on the heap with
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* OPENSSL_malloc(), and need to be free'd with OPENSSL_free().
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*
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* If the ui_method doesn't contain a pointer to a user-defined prompt
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* constructor, a default string is built, looking like this:
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*
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* "Enter {object_desc} for {object_name}:"
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*
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* So, if object_desc has the value "pass phrase" and object_name has
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* the value "foo.key", the resulting string is:
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*
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* "Enter pass phrase for foo.key:"
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*/
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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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/*
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* The following function is used to store a pointer to user-specific data.
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* Any previous such pointer will be returned and replaced.
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*
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* For callback purposes, this function makes a lot more sense than using
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* ex_data, since the latter requires that different parts of OpenSSL or
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* applications share the same ex_data index.
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*
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* Note that the UI_OpenSSL() method completely ignores the user data. Other
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* methods may not, however.
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*/
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void *UI_add_user_data(UI *ui, void *user_data);
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/*
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* Alternatively, this function is used to duplicate the user data.
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* This uses the duplicator method function. The destroy function will
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* be used to free the user data in this case.
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*/
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int UI_dup_user_data(UI *ui, void *user_data);
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/* We need a user data retrieving function as well. */
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void *UI_get0_user_data(UI *ui);
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/* Return the result associated with a prompt given with the index i. */
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const char *UI_get0_result(UI *ui, int i);
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int UI_get_result_length(UI *ui, int i);
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/* When all strings have been added, process the whole thing. */
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int UI_process(UI *ui);
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/*
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* Give a user interface parameterised control commands. This can be used to
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* send down an integer, a data pointer or a function pointer, as well as be
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* used to get information from a UI.
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*/
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int UI_ctrl(UI *ui, int cmd, long i, void *p, void (*f) (void));
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/* The commands */
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/*
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* Use UI_CONTROL_PRINT_ERRORS with the value 1 to have UI_process print the
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* OpenSSL error stack before printing any info or added error messages and
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* before any prompting.
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*/
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# define UI_CTRL_PRINT_ERRORS 1
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/*
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* Check if a UI_process() is possible to do again with the same instance of
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* a user interface. This makes UI_ctrl() return 1 if it is redoable, and 0
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* if not.
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*/
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# define UI_CTRL_IS_REDOABLE 2
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/* Some methods may use extra data */
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# define UI_set_app_data(s,arg) UI_set_ex_data(s,0,arg)
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# define UI_get_app_data(s) UI_get_ex_data(s,0)
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# define UI_get_ex_new_index(l, p, newf, dupf, freef) \
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CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_UI, l, p, newf, dupf, freef)
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int UI_set_ex_data(UI *r, int idx, void *arg);
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void *UI_get_ex_data(UI *r, int idx);
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/* Use specific methods instead of the built-in one */
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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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# ifndef OPENSSL_NO_UI_CONSOLE
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/* The method with all the built-in thingies */
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UI_METHOD *UI_OpenSSL(void);
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# endif
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/*
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* NULL method. Literally does nothing, but may serve as a placeholder
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* to avoid internal default.
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*/
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const UI_METHOD *UI_null(void);
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/* ---------- For method writers ---------- */
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/*-
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A method contains a number of functions that implement the low level
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of the User Interface. The functions are:
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an opener This function starts a session, maybe by opening
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a channel to a tty, or by opening a window.
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a writer This function is called to write a given string,
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maybe to the tty, maybe as a field label in a
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window.
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a flusher This function is called to flush everything that
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has been output so far. It can be used to actually
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display a dialog box after it has been built.
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a reader This function is called to read a given prompt,
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maybe from the tty, maybe from a field in a
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window. Note that it's called with all string
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structures, not only the prompt ones, so it must
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check such things itself.
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a closer This function closes the session, maybe by closing
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the channel to the tty, or closing the window.
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All these functions are expected to return:
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0 on error.
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1 on success.
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-1 on out-of-band events, for example if some prompting has
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been canceled (by pressing Ctrl-C, for example). This is
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only checked when returned by the flusher or the reader.
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The way this is used, the opener is first called, then the writer for all
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strings, then the flusher, then the reader for all strings and finally the
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closer. Note that if you want to prompt from a terminal or other command
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line interface, the best is to have the reader also write the prompts
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instead of having the writer do it. If you want to prompt from a dialog
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box, the writer can be used to build up the contents of the box, and the
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flusher to actually display the box and run the event loop until all data
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has been given, after which the reader only grabs the given data and puts
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them back into the UI strings.
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All method functions take a UI as argument. Additionally, the writer and
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the reader take a UI_STRING.
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*/
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/*
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* The UI_STRING type is the data structure that contains all the needed info
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* about a string or a prompt, including test data for a verification prompt.
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*/
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typedef struct ui_string_st UI_STRING;
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DEFINE_STACK_OF(UI_STRING)
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/*
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* The different types of strings that are currently supported. This is only
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* needed by method authors.
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*/
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enum UI_string_types {
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UIT_NONE = 0,
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UIT_PROMPT, /* Prompt for a string */
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UIT_VERIFY, /* Prompt for a string and verify */
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UIT_BOOLEAN, /* Prompt for a yes/no response */
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UIT_INFO, /* Send info to the user */
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UIT_ERROR /* Send an error message to the user */
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};
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/* Create and manipulate methods */
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UI_METHOD *UI_create_method(const char *name);
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void UI_destroy_method(UI_METHOD *ui_method);
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int UI_method_set_opener(UI_METHOD *method, int (*opener) (UI *ui));
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int UI_method_set_writer(UI_METHOD *method,
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int (*writer) (UI *ui, UI_STRING *uis));
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int UI_method_set_flusher(UI_METHOD *method, int (*flusher) (UI *ui));
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int UI_method_set_reader(UI_METHOD *method,
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int (*reader) (UI *ui, UI_STRING *uis));
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int UI_method_set_closer(UI_METHOD *method, int (*closer) (UI *ui));
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int UI_method_set_data_duplicator(UI_METHOD *method,
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void *(*duplicator) (UI *ui, void *ui_data),
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void (*destructor)(UI *ui, void *ui_data));
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int UI_method_set_prompt_constructor(UI_METHOD *method,
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char *(*prompt_constructor) (UI *ui,
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const char
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*object_desc,
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const char
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*object_name));
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int UI_method_set_ex_data(UI_METHOD *method, int idx, void *data);
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int (*UI_method_get_opener(const UI_METHOD *method)) (UI *);
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int (*UI_method_get_writer(const UI_METHOD *method)) (UI *, UI_STRING *);
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int (*UI_method_get_flusher(const UI_METHOD *method)) (UI *);
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int (*UI_method_get_reader(const UI_METHOD *method)) (UI *, UI_STRING *);
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int (*UI_method_get_closer(const UI_METHOD *method)) (UI *);
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char *(*UI_method_get_prompt_constructor(const UI_METHOD *method))
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(UI *, const char *, const char *);
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void *(*UI_method_get_data_duplicator(const UI_METHOD *method)) (UI *, void *);
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void (*UI_method_get_data_destructor(const UI_METHOD *method)) (UI *, void *);
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const void *UI_method_get_ex_data(const UI_METHOD *method, int idx);
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/*
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* The following functions are helpers for method writers to access relevant
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* data from a UI_STRING.
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*/
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/* Return type of the UI_STRING */
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enum UI_string_types UI_get_string_type(UI_STRING *uis);
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/* Return input flags of the UI_STRING */
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int UI_get_input_flags(UI_STRING *uis);
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/* Return the actual string to output (the prompt, info or error) */
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const char *UI_get0_output_string(UI_STRING *uis);
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/*
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* Return the optional action string to output (the boolean prompt
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* instruction)
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*/
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const char *UI_get0_action_string(UI_STRING *uis);
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/* Return the result of a prompt */
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const char *UI_get0_result_string(UI_STRING *uis);
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int UI_get_result_string_length(UI_STRING *uis);
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/*
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* Return the string to test the result against. Only useful with verifies.
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*/
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const char *UI_get0_test_string(UI_STRING *uis);
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/* Return the required minimum size of the result */
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int UI_get_result_minsize(UI_STRING *uis);
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/* Return the required maximum size of the result */
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int UI_get_result_maxsize(UI_STRING *uis);
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/* Set the result of a UI_STRING. */
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int UI_set_result(UI *ui, UI_STRING *uis, const char *result);
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int UI_set_result_ex(UI *ui, UI_STRING *uis, const char *result, int len);
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/* A couple of popular utility functions */
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int UI_UTIL_read_pw_string(char *buf, int length, const char *prompt,
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int verify);
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int UI_UTIL_read_pw(char *buf, char *buff, int size, const char *prompt,
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int verify);
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UI_METHOD *UI_UTIL_wrap_read_pem_callback(pem_password_cb *cb, int rwflag);
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# ifdef __cplusplus
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}
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# endif
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#endif
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