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ui.h

/* crypto/ui/ui.h -*- mode:C; c-file-style: "eay" -*- */
/* Written by Richard Levitte (richard@levitte.org) for the OpenSSL
 * project 2001.
 */
/* ====================================================================
 * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    openssl-core@openssl.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#ifndef HEADER_UI_H
#define HEADER_UI_H

#include <openssl/crypto.h>
#include <openssl/safestack.h>

#ifdef  __cplusplus
extern "C" {
#endif

/* The UI type is a holder for a specific user interface session.  It can
   contain an illimited number of informational or error strings as well
   as things to prompt for, both passwords (noecho mode) and others (echo
   mode), and verification of the same.  All of these are called strings,
   and are further described below. */
typedef struct ui_st UI;

/* All instances of UI have a reference to a method structure, which is a
   ordered vector of functions that implement the lower level things to do.
   There is an instruction on the implementation further down, in the section
   for method implementors. */
typedef struct ui_method_st UI_METHOD;


/* All the following functions return -1 or NULL on error and in some cases
   (UI_process()) -2 if interrupted or in some other way cancelled.
   When everything is fine, they return 0, a positive value or a non-NULL
   pointer, all depending on their purpose. */

/* Creators and destructor.   */
UI *UI_new(void);
UI *UI_new_method(const UI_METHOD *method);
void UI_free(UI *ui);

/* The following functions are used to add strings to be printed and prompt
   strings to prompt for data.  The names are UI_{add,dup}_<function>_string
   and UI_{add,dup}_input_boolean.

   UI_{add,dup}_<function>_string have the following meanings:
      add   add a text or prompt string.  The pointers given to these
            functions are used verbatim, no copying is done.
      dup   make a copy of the text or prompt string, then add the copy
            to the collection of strings in the user interface.
      <function>
            The function is a name for the functionality that the given
            string shall be used for.  It can be one of:
                  input use the string as data prompt.
                  verify      use the string as verification prompt.  This
                        is used to verify a previous input.
                  info  use the string for informational output.
                  error use the string for error output.
   Honestly, there's currently no difference between info and error for the
   moment.

   UI_{add,dup}_input_boolean have the same semantics for "add" and "dup",
   and are typically used when one wants to prompt for a yes/no response.


   All of the functions in this group take a UI and a prompt string.
   The string input and verify addition functions also take a flag argument,
   a buffer for the result to end up with, a minimum input size and a maximum
   input size (the result buffer MUST be large enough to be able to contain
   the maximum number of characters).  Additionally, the verify addition
   functions takes another buffer to compare the result against.
   The boolean input functions take an action description string (which should
   be safe to ignore if the expected user action is obvious, for example with
   a dialog box with an OK button and a Cancel button), a string of acceptable
   characters to mean OK and to mean Cancel.  The two last strings are checked
   to make sure they don't have common characters.  Additionally, the same
   flag argument as for the string input is taken, as well as a result buffer.
   The result buffer is required to be at least one byte long.  Depending on
   the answer, the first character from the OK or the Cancel character strings
   will be stored in the first byte of the result buffer.  No NUL will be
   added, so the result is *not* a string.

   On success, the all return an index of the added information.  That index
   is usefull when retrieving results with UI_get0_result(). */
int UI_add_input_string(UI *ui, const char *prompt, int flags,
      char *result_buf, int minsize, int maxsize);
int UI_dup_input_string(UI *ui, const char *prompt, int flags,
      char *result_buf, int minsize, int maxsize);
int UI_add_verify_string(UI *ui, const char *prompt, int flags,
      char *result_buf, int minsize, int maxsize, const char *test_buf);
int UI_dup_verify_string(UI *ui, const char *prompt, int flags,
      char *result_buf, int minsize, int maxsize, const char *test_buf);
int UI_add_input_boolean(UI *ui, const char *prompt, const char *action_desc,
      const char *ok_chars, const char *cancel_chars,
      int flags, char *result_buf);
int UI_dup_input_boolean(UI *ui, const char *prompt, const char *action_desc,
      const char *ok_chars, const char *cancel_chars,
      int flags, char *result_buf);
int UI_add_info_string(UI *ui, const char *text);
int UI_dup_info_string(UI *ui, const char *text);
int UI_add_error_string(UI *ui, const char *text);
int UI_dup_error_string(UI *ui, const char *text);

/* These are the possible flags.  They can be or'ed together. */
/* Use to have echoing of input */
#define UI_INPUT_FLAG_ECHO          0x01
/* Use a default password.  Where that password is found is completely
   up to the application, it might for example be in the user data set
   with UI_add_user_data().  It is not recommended to have more than
   one input in each UI being marked with this flag, or the application
   might get confused. */
#define UI_INPUT_FLAG_DEFAULT_PWD   0x02

/* The user of these routines may want to define flags of their own.  The core
   UI won't look at those, but will pass them on to the method routines.  They
   must use higher bits so they don't get confused with the UI bits above.
   UI_INPUT_FLAG_USER_BASE tells which is the lowest bit to use.  A good
   example of use is this:

      #define MY_UI_FLAG1     (0x01 << UI_INPUT_FLAG_USER_BASE)

*/
#define UI_INPUT_FLAG_USER_BASE     16


/* The following function helps construct a prompt.  object_desc is a
   textual short description of the object, for example "pass phrase",
   and object_name is the name of the object (might be a card name or
   a file name.
   The returned string shall always be allocated on the heap with
   OPENSSL_malloc(), and need to be free'd with OPENSSL_free().

   If the ui_method doesn't contain a pointer to a user-defined prompt
   constructor, a default string is built, looking like this:

      "Enter {object_desc} for {object_name}:"

   So, if object_desc has the value "pass phrase" and object_name has
   the value "foo.key", the resulting string is:

      "Enter pass phrase for foo.key:"
*/
char *UI_construct_prompt(UI *ui_method,
      const char *object_desc, const char *object_name);


/* The following function is used to store a pointer to user-specific data.
   Any previous such pointer will be returned and replaced.

   For callback purposes, this function makes a lot more sense than using
   ex_data, since the latter requires that different parts of OpenSSL or
   applications share the same ex_data index.

   Note that the UI_OpenSSL() method completely ignores the user data.
   Other methods may not, however.  */
void *UI_add_user_data(UI *ui, void *user_data);
/* We need a user data retrieving function as well.  */
void *UI_get0_user_data(UI *ui);

/* Return the result associated with a prompt given with the index i. */
const char *UI_get0_result(UI *ui, int i);

/* When all strings have been added, process the whole thing. */
int UI_process(UI *ui);

/* Give a user interface parametrised control commands.  This can be used to
   send down an integer, a data pointer or a function pointer, as well as
   be used to get information from a UI. */
int UI_ctrl(UI *ui, int cmd, long i, void *p, void (*f)());

/* The commands */
/* Use UI_CONTROL_PRINT_ERRORS with the value 1 to have UI_process print the
   OpenSSL error stack before printing any info or added error messages and
   before any prompting. */
#define UI_CTRL_PRINT_ERRORS        1
/* Check if a UI_process() is possible to do again with the same instance of
   a user interface.  This makes UI_ctrl() return 1 if it is redoable, and 0
   if not. */
#define UI_CTRL_IS_REDOABLE         2


/* Some methods may use extra data */
#define UI_set_app_data(s,arg)         UI_set_ex_data(s,0,arg)
#define UI_get_app_data(s)             UI_get_ex_data(s,0)
int UI_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
      CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func);
int UI_set_ex_data(UI *r,int idx,void *arg);
void *UI_get_ex_data(UI *r, int idx);

/* Use specific methods instead of the built-in one */
void UI_set_default_method(const UI_METHOD *meth);
const UI_METHOD *UI_get_default_method(void);
const UI_METHOD *UI_get_method(UI *ui);
const UI_METHOD *UI_set_method(UI *ui, const UI_METHOD *meth);

/* The method with all the built-in thingies */
UI_METHOD *UI_OpenSSL(void);


/* ---------- For method writers ---------- */
/* A method contains a number of functions that implement the low level
   of the User Interface.  The functions are:

      an opener   This function starts a session, maybe by opening
                  a channel to a tty, or by opening a window.
      a writer    This function is called to write a given string,
                  maybe to the tty, maybe as a field label in a
                  window.
      a flusher   This function is called to flush everything that
                  has been output so far.  It can be used to actually
                  display a dialog box after it has been built.
      a reader    This function is called to read a given prompt,
                  maybe from the tty, maybe from a field in a
                  window.  Note that it's called wth all string
                  structures, not only the prompt ones, so it must
                  check such things itself.
      a closer    This function closes the session, maybe by closing
                  the channel to the tty, or closing the window.

   All these functions are expected to return:

      0     on error.
      1     on success.
      -1    on out-of-band events, for example if some prompting has
            been canceled (by pressing Ctrl-C, for example).  This is
            only checked when returned by the flusher or the reader.

   The way this is used, the opener is first called, then the writer for all
   strings, then the flusher, then the reader for all strings and finally the
   closer.  Note that if you want to prompt from a terminal or other command
   line interface, the best is to have the reader also write the prompts
   instead of having the writer do it.  If you want to prompt from a dialog
   box, the writer can be used to build up the contents of the box, and the
   flusher to actually display the box and run the event loop until all data
   has been given, after which the reader only grabs the given data and puts
   them back into the UI strings.

   All method functions take a UI as argument.  Additionally, the writer and
   the reader take a UI_STRING.
*/

/* The UI_STRING type is the data structure that contains all the needed info
   about a string or a prompt, including test data for a verification prompt.
*/
DECLARE_STACK_OF(UI_STRING)
typedef struct ui_string_st UI_STRING;

/* The different types of strings that are currently supported.
   This is only needed by method authors. */
enum UI_string_types
      {
      UIT_NONE=0,
      UIT_PROMPT,       /* Prompt for a string */
      UIT_VERIFY,       /* Prompt for a string and verify */
      UIT_BOOLEAN,            /* Prompt for a yes/no response */
      UIT_INFO,         /* Send info to the user */
      UIT_ERROR         /* Send an error message to the user */
      };

/* Create and manipulate methods */
UI_METHOD *UI_create_method(char *name);
void UI_destroy_method(UI_METHOD *ui_method);
int UI_method_set_opener(UI_METHOD *method, int (*opener)(UI *ui));
int UI_method_set_writer(UI_METHOD *method, int (*writer)(UI *ui, UI_STRING *uis));
int UI_method_set_flusher(UI_METHOD *method, int (*flusher)(UI *ui));
int UI_method_set_reader(UI_METHOD *method, int (*reader)(UI *ui, UI_STRING *uis));
int UI_method_set_closer(UI_METHOD *method, int (*closer)(UI *ui));
int (*UI_method_get_opener(UI_METHOD *method))(UI*);
int (*UI_method_get_writer(UI_METHOD *method))(UI*,UI_STRING*);
int (*UI_method_get_flusher(UI_METHOD *method))(UI*);
int (*UI_method_get_reader(UI_METHOD *method))(UI*,UI_STRING*);
int (*UI_method_get_closer(UI_METHOD *method))(UI*);

/* The following functions are helpers for method writers to access relevant
   data from a UI_STRING. */

/* Return type of the UI_STRING */
enum UI_string_types UI_get_string_type(UI_STRING *uis);
/* Return input flags of the UI_STRING */
int UI_get_input_flags(UI_STRING *uis);
/* Return the actual string to output (the prompt, info or error) */
const char *UI_get0_output_string(UI_STRING *uis);
/* Return the optional action string to output (the boolean promtp instruction) */
const char *UI_get0_action_string(UI_STRING *uis);
/* Return the result of a prompt */
const char *UI_get0_result_string(UI_STRING *uis);
/* Return the string to test the result against.  Only useful with verifies. */
const char *UI_get0_test_string(UI_STRING *uis);
/* Return the required minimum size of the result */
int UI_get_result_minsize(UI_STRING *uis);
/* Return the required maximum size of the result */
int UI_get_result_maxsize(UI_STRING *uis);
/* Set the result of a UI_STRING. */
int UI_set_result(UI *ui, UI_STRING *uis, const char *result);


/* A couple of popular utility functions */
int UI_UTIL_read_pw_string(char *buf,int length,const char *prompt,int verify);
int UI_UTIL_read_pw(char *buf,char *buff,int size,const char *prompt,int verify);


/* BEGIN ERROR CODES */
/* The following lines are auto generated by the script mkerr.pl. Any changes
 * made after this point may be overwritten when the script is next run.
 */
void ERR_load_UI_strings(void);

/* Error codes for the UI functions. */

/* Function codes. */
#define UI_F_GENERAL_ALLOCATE_BOOLEAN                  108
#define UI_F_GENERAL_ALLOCATE_PROMPT                   109
#define UI_F_GENERAL_ALLOCATE_STRING                   100
#define UI_F_UI_CTRL                             111
#define UI_F_UI_DUP_ERROR_STRING                 101
#define UI_F_UI_DUP_INFO_STRING                        102
#define UI_F_UI_DUP_INPUT_BOOLEAN                110
#define UI_F_UI_DUP_INPUT_STRING                 103
#define UI_F_UI_DUP_VERIFY_STRING                106
#define UI_F_UI_GET0_RESULT                      107
#define UI_F_UI_NEW_METHOD                       104
#define UI_F_UI_SET_RESULT                       105

/* Reason codes. */
#define UI_R_COMMON_OK_AND_CANCEL_CHARACTERS           104
#define UI_R_INDEX_TOO_LARGE                     102
#define UI_R_INDEX_TOO_SMALL                     103
#define UI_R_NO_RESULT_BUFFER                    105
#define UI_R_RESULT_TOO_LARGE                    100
#define UI_R_RESULT_TOO_SMALL                    101
#define UI_R_UNKNOWN_CONTROL_COMMAND                   106

#ifdef  __cplusplus
}
#endif
#endif

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