crypto/ui/ui_lib.c

   1 /* crypto/ui/ui_lib.c -*- mode:C; c-file-style: "eay" -*- */
   2 /*
   3  * Written by Richard Levitte (richard@levitte.org) for the OpenSSL project
   4  * 2001.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    openssl-core@openssl.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include <string.h>
  61 #include "internal/cryptlib.h"
  62 #include <openssl/e_os2.h>
  63 #include <openssl/buffer.h>
  64 #include <openssl/ui.h>
  65 #include <openssl/err.h>
  66 #include "ui_locl.h"
  67
  68 static const UI_METHOD *default_UI_meth = NULL;
  69
  70 UI *UI_new(void)
  71 {
  72     return (UI_new_method(NULL));
  73 }
  74
  75 UI *UI_new_method(const UI_METHOD *method)
  76 {
  77     UI *ret = OPENSSL_malloc(sizeof(*ret));
  78
  79     if (ret == NULL) {
  80         UIerr(UI_F_UI_NEW_METHOD, ERR_R_MALLOC_FAILURE);
  81         return NULL;
  82     }
  83     if (method == NULL)
  84         ret->meth = UI_get_default_method();
  85     else
  86         ret->meth = method;
  87
  88     ret->strings = NULL;
  89     ret->user_data = NULL;
  90     ret->flags = 0;
  91     CRYPTO_new_ex_data(CRYPTO_EX_INDEX_UI, ret, &ret->ex_data);
  92     return ret;
  93 }
  94
  95 static void free_string(UI_STRING *uis)
  96 {
  97     if (uis->flags & OUT_STRING_FREEABLE) {
  98         OPENSSL_free((char *)uis->out_string);
  99         switch (uis->type) {
 100         case UIT_BOOLEAN:
 101             OPENSSL_free((char *)uis->_.boolean_data.action_desc);
 102             OPENSSL_free((char *)uis->_.boolean_data.ok_chars);
 103             OPENSSL_free((char *)uis->_.boolean_data.cancel_chars);
 104             break;
 105         default:
 106             break;
 107         }
 108     }
 109     OPENSSL_free(uis);
 110 }
 111
 112 void UI_free(UI *ui)
 113 {
 114     if (ui == NULL)
 115         return;
 116     sk_UI_STRING_pop_free(ui->strings, free_string);
 117     CRYPTO_free_ex_data(CRYPTO_EX_INDEX_UI, ui, &ui->ex_data);
 118     OPENSSL_free(ui);
 119 }
 120
 121 static int allocate_string_stack(UI *ui)
 122 {
 123     if (ui->strings == NULL) {
 124         ui->strings = sk_UI_STRING_new_null();
 125         if (ui->strings == NULL) {
 126             return -1;
 127         }
 128     }
 129     return 0;
 130 }
 131
 132 static UI_STRING *general_allocate_prompt(UI *ui, const char *prompt,
 133                                           int prompt_freeable,
 134                                           enum UI_string_types type,
 135                                           int input_flags, char *result_buf)
 136 {
 137     UI_STRING *ret = NULL;
 138
 139     if (prompt == NULL) {
 140         UIerr(UI_F_GENERAL_ALLOCATE_PROMPT, ERR_R_PASSED_NULL_PARAMETER);
 141     } else if ((type == UIT_PROMPT || type == UIT_VERIFY
 142                 || type == UIT_BOOLEAN) && result_buf == NULL) {
 143         UIerr(UI_F_GENERAL_ALLOCATE_PROMPT, UI_R_NO_RESULT_BUFFER);
 144     } else if ((ret = OPENSSL_malloc(sizeof(*ret)))) {
 145         ret->out_string = prompt;
 146         ret->flags = prompt_freeable ? OUT_STRING_FREEABLE : 0;
 147         ret->input_flags = input_flags;
 148         ret->type = type;
 149         ret->result_buf = result_buf;
 150     }
 151     return ret;
 152 }
 153
 154 static int general_allocate_string(UI *ui, const char *prompt,
 155                                    int prompt_freeable,
 156                                    enum UI_string_types type, int input_flags,
 157                                    char *result_buf, int minsize, int maxsize,
 158                                    const char *test_buf)
 159 {
 160     int ret = -1;
 161     UI_STRING *s = general_allocate_prompt(ui, prompt, prompt_freeable,
 162                                            type, input_flags, result_buf);
 163
 164     if (s) {
 165         if (allocate_string_stack(ui) >= 0) {
 166             s->_.string_data.result_minsize = minsize;
 167             s->_.string_data.result_maxsize = maxsize;
 168             s->_.string_data.test_buf = test_buf;
 169             ret = sk_UI_STRING_push(ui->strings, s);
 170             /* sk_push() returns 0 on error.  Let's addapt that */
 171             if (ret <= 0)
 172                 ret--;
 173         } else
 174             free_string(s);
 175     }
 176     return ret;
 177 }
 178
 179 static int general_allocate_boolean(UI *ui,
 180                                     const char *prompt,
 181                                     const char *action_desc,
 182                                     const char *ok_chars,
 183                                     const char *cancel_chars,
 184                                     int prompt_freeable,
 185                                     enum UI_string_types type,
 186                                     int input_flags, char *result_buf)
 187 {
 188     int ret = -1;
 189     UI_STRING *s;
 190     const char *p;
 191
 192     if (ok_chars == NULL) {
 193         UIerr(UI_F_GENERAL_ALLOCATE_BOOLEAN, ERR_R_PASSED_NULL_PARAMETER);
 194     } else if (cancel_chars == NULL) {
 195         UIerr(UI_F_GENERAL_ALLOCATE_BOOLEAN, ERR_R_PASSED_NULL_PARAMETER);
 196     } else {
 197         for (p = ok_chars; *p; p++) {
 198             if (strchr(cancel_chars, *p)) {
 199                 UIerr(UI_F_GENERAL_ALLOCATE_BOOLEAN,
 200                       UI_R_COMMON_OK_AND_CANCEL_CHARACTERS);
 201             }
 202         }
 203
 204         s = general_allocate_prompt(ui, prompt, prompt_freeable,
 205                                     type, input_flags, result_buf);
 206
 207         if (s) {
 208             if (allocate_string_stack(ui) >= 0) {
 209                 s->_.boolean_data.action_desc = action_desc;
 210                 s->_.boolean_data.ok_chars = ok_chars;
 211                 s->_.boolean_data.cancel_chars = cancel_chars;
 212                 ret = sk_UI_STRING_push(ui->strings, s);
 213                 /*
 214                  * sk_push() returns 0 on error. Let's addapt that
 215                  */
 216                 if (ret <= 0)
 217                     ret--;
 218             } else
 219                 free_string(s);
 220         }
 221     }
 222     return ret;
 223 }
 224
 225 /*
 226  * Returns the index to the place in the stack or -1 for error.  Uses a
 227  * direct reference to the prompt.
 228  */
 229 int UI_add_input_string(UI *ui, const char *prompt, int flags,
 230                         char *result_buf, int minsize, int maxsize)
 231 {
 232     return general_allocate_string(ui, prompt, 0,
 233                                    UIT_PROMPT, flags, result_buf, minsize,
 234                                    maxsize, NULL);
 235 }
 236
 237 /* Same as UI_add_input_string(), excepts it takes a copy of the prompt */
 238 int UI_dup_input_string(UI *ui, const char *prompt, int flags,
 239                         char *result_buf, int minsize, int maxsize)
 240 {
 241     char *prompt_copy = NULL;
 242
 243     if (prompt) {
 244         prompt_copy = BUF_strdup(prompt);
 245         if (prompt_copy == NULL) {
 246             UIerr(UI_F_UI_DUP_INPUT_STRING, ERR_R_MALLOC_FAILURE);
 247             return 0;
 248         }
 249     }
 250
 251     return general_allocate_string(ui, prompt_copy, 1,
 252                                    UIT_PROMPT, flags, result_buf, minsize,
 253                                    maxsize, NULL);
 254 }
 255
 256 int UI_add_verify_string(UI *ui, const char *prompt, int flags,
 257                          char *result_buf, int minsize, int maxsize,
 258                          const char *test_buf)
 259 {
 260     return general_allocate_string(ui, prompt, 0,
 261                                    UIT_VERIFY, flags, result_buf, minsize,
 262                                    maxsize, test_buf);
 263 }
 264
 265 int UI_dup_verify_string(UI *ui, const char *prompt, int flags,
 266                          char *result_buf, int minsize, int maxsize,
 267                          const char *test_buf)
 268 {
 269     char *prompt_copy = NULL;
 270
 271     if (prompt) {
 272         prompt_copy = BUF_strdup(prompt);
 273         if (prompt_copy == NULL) {
 274             UIerr(UI_F_UI_DUP_VERIFY_STRING, ERR_R_MALLOC_FAILURE);
 275             return -1;
 276         }
 277     }
 278
 279     return general_allocate_string(ui, prompt_copy, 1,
 280                                    UIT_VERIFY, flags, result_buf, minsize,
 281                                    maxsize, test_buf);
 282 }
 283
 284 int UI_add_input_boolean(UI *ui, const char *prompt, const char *action_desc,
 285                          const char *ok_chars, const char *cancel_chars,
 286                          int flags, char *result_buf)
 287 {
 288     return general_allocate_boolean(ui, prompt, action_desc,
 289                                     ok_chars, cancel_chars, 0, UIT_BOOLEAN,
 290                                     flags, result_buf);
 291 }
 292
 293 int UI_dup_input_boolean(UI *ui, const char *prompt, const char *action_desc,
 294                          const char *ok_chars, const char *cancel_chars,
 295                          int flags, char *result_buf)
 296 {
 297     char *prompt_copy = NULL;
 298     char *action_desc_copy = NULL;
 299     char *ok_chars_copy = NULL;
 300     char *cancel_chars_copy = NULL;
 301
 302     if (prompt) {
 303         prompt_copy = BUF_strdup(prompt);
 304         if (prompt_copy == NULL) {
 305             UIerr(UI_F_UI_DUP_INPUT_BOOLEAN, ERR_R_MALLOC_FAILURE);
 306             goto err;
 307         }
 308     }
 309
 310     if (action_desc) {
 311         action_desc_copy = BUF_strdup(action_desc);
 312         if (action_desc_copy == NULL) {
 313             UIerr(UI_F_UI_DUP_INPUT_BOOLEAN, ERR_R_MALLOC_FAILURE);
 314             goto err;
 315         }
 316     }
 317
 318     if (ok_chars) {
 319         ok_chars_copy = BUF_strdup(ok_chars);
 320         if (ok_chars_copy == NULL) {
 321             UIerr(UI_F_UI_DUP_INPUT_BOOLEAN, ERR_R_MALLOC_FAILURE);
 322             goto err;
 323         }
 324     }
 325
 326     if (cancel_chars) {
 327         cancel_chars_copy = BUF_strdup(cancel_chars);
 328         if (cancel_chars_copy == NULL) {
 329             UIerr(UI_F_UI_DUP_INPUT_BOOLEAN, ERR_R_MALLOC_FAILURE);
 330             goto err;
 331         }
 332     }
 333
 334     return general_allocate_boolean(ui, prompt_copy, action_desc_copy,
 335                                     ok_chars_copy, cancel_chars_copy, 1,
 336                                     UIT_BOOLEAN, flags, result_buf);
 337  err:
 338     OPENSSL_free(prompt_copy);
 339     OPENSSL_free(action_desc_copy);
 340     OPENSSL_free(ok_chars_copy);
 341     OPENSSL_free(cancel_chars_copy);
 342     return -1;
 343 }
 344
 345 int UI_add_info_string(UI *ui, const char *text)
 346 {
 347     return general_allocate_string(ui, text, 0, UIT_INFO, 0, NULL, 0, 0,
 348                                    NULL);
 349 }
 350
 351 int UI_dup_info_string(UI *ui, const char *text)
 352 {
 353     char *text_copy = NULL;
 354
 355     if (text) {
 356         text_copy = BUF_strdup(text);
 357         if (text_copy == NULL) {
 358             UIerr(UI_F_UI_DUP_INFO_STRING, ERR_R_MALLOC_FAILURE);
 359             return -1;
 360         }
 361     }
 362
 363     return general_allocate_string(ui, text_copy, 1, UIT_INFO, 0, NULL,
 364                                    0, 0, NULL);
 365 }
 366
 367 int UI_add_error_string(UI *ui, const char *text)
 368 {
 369     return general_allocate_string(ui, text, 0, UIT_ERROR, 0, NULL, 0, 0,
 370                                    NULL);
 371 }
 372
 373 int UI_dup_error_string(UI *ui, const char *text)
 374 {
 375     char *text_copy = NULL;
 376
 377     if (text) {
 378         text_copy = BUF_strdup(text);
 379         if (text_copy == NULL) {
 380             UIerr(UI_F_UI_DUP_ERROR_STRING, ERR_R_MALLOC_FAILURE);
 381             return -1;
 382         }
 383     }
 384     return general_allocate_string(ui, text_copy, 1, UIT_ERROR, 0, NULL,
 385                                    0, 0, NULL);
 386 }
 387
 388 char *UI_construct_prompt(UI *ui, const char *object_desc,
 389                           const char *object_name)
 390 {
 391     char *prompt = NULL;
 392
 393     if (ui->meth->ui_construct_prompt)
 394         prompt = ui->meth->ui_construct_prompt(ui, object_desc, object_name);
 395     else {
 396         char prompt1[] = "Enter ";
 397         char prompt2[] = " for ";
 398         char prompt3[] = ":";
 399         int len = 0;
 400
 401         if (object_desc == NULL)
 402             return NULL;
 403         len = sizeof(prompt1) - 1 + strlen(object_desc);
 404         if (object_name)
 405             len += sizeof(prompt2) - 1 + strlen(object_name);
 406         len += sizeof(prompt3) - 1;
 407
 408         prompt = OPENSSL_malloc(len + 1);
 409         if (prompt == NULL)
 410             return NULL;
 411         BUF_strlcpy(prompt, prompt1, len + 1);
 412         BUF_strlcat(prompt, object_desc, len + 1);
 413         if (object_name) {
 414             BUF_strlcat(prompt, prompt2, len + 1);
 415             BUF_strlcat(prompt, object_name, len + 1);
 416         }
 417         BUF_strlcat(prompt, prompt3, len + 1);
 418     }
 419     return prompt;
 420 }
 421
 422 void *UI_add_user_data(UI *ui, void *user_data)
 423 {
 424     void *old_data = ui->user_data;
 425     ui->user_data = user_data;
 426     return old_data;
 427 }
 428
 429 void *UI_get0_user_data(UI *ui)
 430 {
 431     return ui->user_data;
 432 }
 433
 434 const char *UI_get0_result(UI *ui, int i)
 435 {
 436     if (i < 0) {
 437         UIerr(UI_F_UI_GET0_RESULT, UI_R_INDEX_TOO_SMALL);
 438         return NULL;
 439     }
 440     if (i >= sk_UI_STRING_num(ui->strings)) {
 441         UIerr(UI_F_UI_GET0_RESULT, UI_R_INDEX_TOO_LARGE);
 442         return NULL;
 443     }
 444     return UI_get0_result_string(sk_UI_STRING_value(ui->strings, i));
 445 }
 446
 447 static int print_error(const char *str, size_t len, UI *ui)
 448 {
 449     UI_STRING uis;
 450
 451     memset(&uis, 0, sizeof(uis));
 452     uis.type = UIT_ERROR;
 453     uis.out_string = str;
 454
 455     if (ui->meth->ui_write_string && !ui->meth->ui_write_string(ui, &uis))
 456         return -1;
 457     return 0;
 458 }
 459
 460 int UI_process(UI *ui)
 461 {
 462     int i, ok = 0;
 463
 464     if (ui->meth->ui_open_session && !ui->meth->ui_open_session(ui))
 465         return -1;
 466
 467     if (ui->flags & UI_FLAG_PRINT_ERRORS)
 468         ERR_print_errors_cb((int (*)(const char *, size_t, void *))
 469                             print_error, (void *)ui);
 470
 471     for (i = 0; i < sk_UI_STRING_num(ui->strings); i++) {
 472         if (ui->meth->ui_write_string
 473             && !ui->meth->ui_write_string(ui,
 474                                           sk_UI_STRING_value(ui->strings, i)))
 475         {
 476             ok = -1;
 477             goto err;
 478         }
 479     }
 480
 481     if (ui->meth->ui_flush)
 482         switch (ui->meth->ui_flush(ui)) {
 483         case -1:               /* Interrupt/Cancel/something... */
 484             ok = -2;
 485             goto err;
 486         case 0:                /* Errors */
 487             ok = -1;
 488             goto err;
 489         default:               /* Success */
 490             ok = 0;
 491             break;
 492         }
 493
 494     for (i = 0; i < sk_UI_STRING_num(ui->strings); i++) {
 495         if (ui->meth->ui_read_string) {
 496             switch (ui->meth->ui_read_string(ui,
 497                                              sk_UI_STRING_value(ui->strings,
 498                                                                 i))) {
 499             case -1:           /* Interrupt/Cancel/something... */
 500                 ok = -2;
 501                 goto err;
 502             case 0:            /* Errors */
 503                 ok = -1;
 504                 goto err;
 505             default:           /* Success */
 506                 ok = 0;
 507                 break;
 508             }
 509         }
 510     }
 511  err:
 512     if (ui->meth->ui_close_session && !ui->meth->ui_close_session(ui))
 513         return -1;
 514     return ok;
 515 }
 516
 517 int UI_ctrl(UI *ui, int cmd, long i, void *p, void (*f) (void))
 518 {
 519     if (ui == NULL) {
 520         UIerr(UI_F_UI_CTRL, ERR_R_PASSED_NULL_PARAMETER);
 521         return -1;
 522     }
 523     switch (cmd) {
 524     case UI_CTRL_PRINT_ERRORS:
 525         {
 526             int save_flag = ! !(ui->flags & UI_FLAG_PRINT_ERRORS);
 527             if (i)
 528                 ui->flags |= UI_FLAG_PRINT_ERRORS;
 529             else
 530                 ui->flags &= ~UI_FLAG_PRINT_ERRORS;
 531             return save_flag;
 532         }
 533     case UI_CTRL_IS_REDOABLE:
 534         return ! !(ui->flags & UI_FLAG_REDOABLE);
 535     default:
 536         break;
 537     }
 538     UIerr(UI_F_UI_CTRL, UI_R_UNKNOWN_CONTROL_COMMAND);
 539     return -1;
 540 }
 541
 542 int UI_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
 543                         CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
 544 {
 545     return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_UI, argl, argp,
 546                                    new_func, dup_func, free_func);
 547 }
 548
 549 int UI_set_ex_data(UI *r, int idx, void *arg)
 550 {
 551     return (CRYPTO_set_ex_data(&r->ex_data, idx, arg));
 552 }
 553
 554 void *UI_get_ex_data(UI *r, int idx)
 555 {
 556     return (CRYPTO_get_ex_data(&r->ex_data, idx));
 557 }
 558
 559 void UI_set_default_method(const UI_METHOD *meth)
 560 {
 561     default_UI_meth = meth;
 562 }
 563
 564 const UI_METHOD *UI_get_default_method(void)
 565 {
 566     if (default_UI_meth == NULL) {
 567         default_UI_meth = UI_OpenSSL();
 568     }
 569     return default_UI_meth;
 570 }
 571
 572 const UI_METHOD *UI_get_method(UI *ui)
 573 {
 574     return ui->meth;
 575 }
 576
 577 const UI_METHOD *UI_set_method(UI *ui, const UI_METHOD *meth)
 578 {
 579     ui->meth = meth;
 580     return ui->meth;
 581 }
 582
 583 UI_METHOD *UI_create_method(char *name)
 584 {
 585     UI_METHOD *ui_method = OPENSSL_malloc(sizeof(*ui_method));
 586
 587     if (ui_method) {
 588         memset(ui_method, 0, sizeof(*ui_method));
 589         ui_method->name = BUF_strdup(name);
 590     }
 591     return ui_method;
 592 }
 593
 594 /*
 595  * BIG FSCKING WARNING!!!! If you use this on a statically allocated method
 596  * (that is, it hasn't been allocated using UI_create_method(), you deserve
 597  * anything Murphy can throw at you and more! You have been warned.
 598  */
 599 void UI_destroy_method(UI_METHOD *ui_method)
 600 {
 601     OPENSSL_free(ui_method->name);
 602     ui_method->name = NULL;
 603     OPENSSL_free(ui_method);
 604 }
 605
 606 int UI_method_set_opener(UI_METHOD *method, int (*opener) (UI *ui))
 607 {
 608     if (method) {
 609         method->ui_open_session = opener;
 610         return 0;
 611     } else
 612         return -1;
 613 }
 614
 615 int UI_method_set_writer(UI_METHOD *method,
 616                          int (*writer) (UI *ui, UI_STRING *uis))
 617 {
 618     if (method) {
 619         method->ui_write_string = writer;
 620         return 0;
 621     } else
 622         return -1;
 623 }
 624
 625 int UI_method_set_flusher(UI_METHOD *method, int (*flusher) (UI *ui))
 626 {
 627     if (method) {
 628         method->ui_flush = flusher;
 629         return 0;
 630     } else
 631         return -1;
 632 }
 633
 634 int UI_method_set_reader(UI_METHOD *method,
 635                          int (*reader) (UI *ui, UI_STRING *uis))
 636 {
 637     if (method) {
 638         method->ui_read_string = reader;
 639         return 0;
 640     } else
 641         return -1;
 642 }
 643
 644 int UI_method_set_closer(UI_METHOD *method, int (*closer) (UI *ui))
 645 {
 646     if (method) {
 647         method->ui_close_session = closer;
 648         return 0;
 649     } else
 650         return -1;
 651 }
 652
 653 int UI_method_set_prompt_constructor(UI_METHOD *method,
 654                                      char *(*prompt_constructor) (UI *ui,
 655                                                                   const char
 656                                                                   *object_desc,
 657                                                                   const char
 658                                                                   *object_name))
 659 {
 660     if (method) {
 661         method->ui_construct_prompt = prompt_constructor;
 662         return 0;
 663     } else
 664         return -1;
 665 }
 666
 667 int (*UI_method_get_opener(UI_METHOD *method)) (UI *) {
 668     if (method)
 669         return method->ui_open_session;
 670     else
 671         return NULL;
 672 }
 673
 674 int (*UI_method_get_writer(UI_METHOD *method)) (UI *, UI_STRING *) {
 675     if (method)
 676         return method->ui_write_string;
 677     else
 678         return NULL;
 679 }
 680
 681 int (*UI_method_get_flusher(UI_METHOD *method)) (UI *) {
 682     if (method)
 683         return method->ui_flush;
 684     else
 685         return NULL;
 686 }
 687
 688 int (*UI_method_get_reader(UI_METHOD *method)) (UI *, UI_STRING *) {
 689     if (method)
 690         return method->ui_read_string;
 691     else
 692         return NULL;
 693 }
 694
 695 int (*UI_method_get_closer(UI_METHOD *method)) (UI *) {
 696     if (method)
 697         return method->ui_close_session;
 698     else
 699         return NULL;
 700 }
 701
 702 char *(*UI_method_get_prompt_constructor(UI_METHOD *method)) (UI *,
 703                                                               const char *,
 704                                                               const char *) {
 705     if (method)
 706         return method->ui_construct_prompt;
 707     else
 708         return NULL;
 709 }
 710
 711 enum UI_string_types UI_get_string_type(UI_STRING *uis)
 712 {
 713     if (!uis)
 714         return UIT_NONE;
 715     return uis->type;
 716 }
 717
 718 int UI_get_input_flags(UI_STRING *uis)
 719 {
 720     if (!uis)
 721         return 0;
 722     return uis->input_flags;
 723 }
 724
 725 const char *UI_get0_output_string(UI_STRING *uis)
 726 {
 727     if (!uis)
 728         return NULL;
 729     return uis->out_string;
 730 }
 731
 732 const char *UI_get0_action_string(UI_STRING *uis)
 733 {
 734     if (!uis)
 735         return NULL;
 736     switch (uis->type) {
 737     case UIT_PROMPT:
 738     case UIT_BOOLEAN:
 739         return uis->_.boolean_data.action_desc;
 740     default:
 741         return NULL;
 742     }
 743 }
 744
 745 const char *UI_get0_result_string(UI_STRING *uis)
 746 {
 747     if (!uis)
 748         return NULL;
 749     switch (uis->type) {
 750     case UIT_PROMPT:
 751     case UIT_VERIFY:
 752         return uis->result_buf;
 753     default:
 754         return NULL;
 755     }
 756 }
 757
 758 const char *UI_get0_test_string(UI_STRING *uis)
 759 {
 760     if (!uis)
 761         return NULL;
 762     switch (uis->type) {
 763     case UIT_VERIFY:
 764         return uis->_.string_data.test_buf;
 765     default:
 766         return NULL;
 767     }
 768 }
 769
 770 int UI_get_result_minsize(UI_STRING *uis)
 771 {
 772     if (!uis)
 773         return -1;
 774     switch (uis->type) {
 775     case UIT_PROMPT:
 776     case UIT_VERIFY:
 777         return uis->_.string_data.result_minsize;
 778     default:
 779         return -1;
 780     }
 781 }
 782
 783 int UI_get_result_maxsize(UI_STRING *uis)
 784 {
 785     if (!uis)
 786         return -1;
 787     switch (uis->type) {
 788     case UIT_PROMPT:
 789     case UIT_VERIFY:
 790         return uis->_.string_data.result_maxsize;
 791     default:
 792         return -1;
 793     }
 794 }
 795
 796 int UI_set_result(UI *ui, UI_STRING *uis, const char *result)
 797 {
 798     int l = strlen(result);
 799
 800     ui->flags &= ~UI_FLAG_REDOABLE;
 801
 802     if (!uis)
 803         return -1;
 804     switch (uis->type) {
 805     case UIT_PROMPT:
 806     case UIT_VERIFY:
 807         {
 808             char number1[DECIMAL_SIZE(uis->_.string_data.result_minsize) + 1];
 809             char number2[DECIMAL_SIZE(uis->_.string_data.result_maxsize) + 1];
 810
 811             BIO_snprintf(number1, sizeof(number1), "%d",
 812                          uis->_.string_data.result_minsize);
 813             BIO_snprintf(number2, sizeof(number2), "%d",
 814                          uis->_.string_data.result_maxsize);
 815
 816             if (l < uis->_.string_data.result_minsize) {
 817                 ui->flags |= UI_FLAG_REDOABLE;
 818                 UIerr(UI_F_UI_SET_RESULT, UI_R_RESULT_TOO_SMALL);
 819                 ERR_add_error_data(5, "You must type in ",
 820                                    number1, " to ", number2, " characters");
 821                 return -1;
 822             }
 823             if (l > uis->_.string_data.result_maxsize) {
 824                 ui->flags |= UI_FLAG_REDOABLE;
 825                 UIerr(UI_F_UI_SET_RESULT, UI_R_RESULT_TOO_LARGE);
 826                 ERR_add_error_data(5, "You must type in ",
 827                                    number1, " to ", number2, " characters");
 828                 return -1;
 829             }
 830         }
 831
 832         if (!uis->result_buf) {
 833             UIerr(UI_F_UI_SET_RESULT, UI_R_NO_RESULT_BUFFER);
 834             return -1;
 835         }
 836
 837         BUF_strlcpy(uis->result_buf, result,
 838                     uis->_.string_data.result_maxsize + 1);
 839         break;
 840     case UIT_BOOLEAN:
 841         {
 842             const char *p;
 843
 844             if (!uis->result_buf) {
 845                 UIerr(UI_F_UI_SET_RESULT, UI_R_NO_RESULT_BUFFER);
 846                 return -1;
 847             }
 848
 849             uis->result_buf[0] = '\0';
 850             for (p = result; *p; p++) {
 851                 if (strchr(uis->_.boolean_data.ok_chars, *p)) {
 852                     uis->result_buf[0] = uis->_.boolean_data.ok_chars[0];
 853                     break;
 854                 }
 855                 if (strchr(uis->_.boolean_data.cancel_chars, *p)) {
 856                     uis->result_buf[0] = uis->_.boolean_data.cancel_chars[0];
 857                     break;
 858                 }
 859             }
 860         }
 861     default:
 862         break;
 863     }
 864     return 0;
 865 }