crypto/ui/ui_openssl.c

   1 /*
   2  * Copyright 2001-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "e_os.h"
  11 #include <openssl/e_os2.h>
  12 #include <openssl/err.h>
  13 #include <openssl/ui.h>
  14
  15 #ifndef OPENSSL_NO_UI_CONSOLE
  16 /*
  17  * need for #define _POSIX_C_SOURCE arises whenever you pass -ansi to gcc
  18  * [maybe others?], because it masks interfaces not discussed in standard,
  19  * sigaction and fileno included. -pedantic would be more appropriate for the
  20  * intended purposes, but we can't prevent users from adding -ansi.
  21  */
  22 # if defined(OPENSSL_SYS_VXWORKS)
  23 #  include <sys/types.h>
  24 # endif
  25
  26 # if !defined(_POSIX_C_SOURCE) && defined(OPENSSL_SYS_VMS)
  27 #  ifndef _POSIX_C_SOURCE
  28 #   define _POSIX_C_SOURCE 2
  29 #  endif
  30 # endif
  31 # include <signal.h>
  32 # include <stdio.h>
  33 # include <string.h>
  34 # include <errno.h>
  35
  36 # if !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS)
  37 #  ifdef OPENSSL_UNISTD
  38 #   include OPENSSL_UNISTD
  39 #  else
  40 #   include <unistd.h>
  41 #  endif
  42 /*
  43  * If unistd.h defines _POSIX_VERSION, we conclude that we are on a POSIX
  44  * system and have sigaction and termios.
  45  */
  46 #  if defined(_POSIX_VERSION) && _POSIX_VERSION>=199309L
  47
  48 #   define SIGACTION
  49 #   if !defined(TERMIOS) && !defined(TERMIO) && !defined(SGTTY)
  50 #    define TERMIOS
  51 #   endif
  52
  53 #  endif
  54 # endif
  55
  56 # include "ui_locl.h"
  57 # include "internal/cryptlib.h"
  58
  59 # ifdef OPENSSL_SYS_VMS          /* prototypes for sys$whatever */
  60 #  include <starlet.h>
  61 #  ifdef __DECC
  62 #   pragma message disable DOLLARID
  63 #  endif
  64 # endif
  65
  66 # ifdef WIN_CONSOLE_BUG
  67 #  include <windows.h>
  68 #  ifndef OPENSSL_SYS_WINCE
  69 #   include <wincon.h>
  70 #  endif
  71 # endif
  72
  73 /*
  74  * There are 6 types of terminal interface supported, TERMIO, TERMIOS, VMS,
  75  * MSDOS, WIN32 Console and SGTTY.
  76  *
  77  * If someone defines one of the macros TERMIO, TERMIOS or SGTTY, it will
  78  * remain respected.  Otherwise, we default to TERMIOS except for a few
  79  * systems that require something different.
  80  *
  81  * Note: we do not use SGTTY unless it's defined by the configuration.  We
  82  * may eventually opt to remove its use entirely.
  83  */
  84
  85 # if !defined(TERMIOS) && !defined(TERMIO) && !defined(SGTTY)
  86
  87 #  if defined(_LIBC)
  88 #   undef  TERMIOS
  89 #   define TERMIO
  90 #   undef  SGTTY
  91 /*
  92  * We know that VMS, MSDOS, VXWORKS, use entirely other mechanisms.
  93  */
  94 #  elif !defined(OPENSSL_SYS_VMS) \
  95         && !defined(OPENSSL_SYS_MSDOS) \
  96         && !defined(OPENSSL_SYS_VXWORKS)
  97 #   define TERMIOS
  98 #   undef  TERMIO
  99 #   undef  SGTTY
 100 #  endif
 101
 102 # endif
 103
 104 # if defined(OPENSSL_SYS_VXWORKS)
 105 #  undef TERMIOS
 106 #  undef TERMIO
 107 #  undef SGTTY
 108 # endif
 109
 110 # ifdef TERMIOS
 111 #  include <termios.h>
 112 #  define TTY_STRUCT             struct termios
 113 #  define TTY_FLAGS              c_lflag
 114 #  define TTY_get(tty,data)      tcgetattr(tty,data)
 115 #  define TTY_set(tty,data)      tcsetattr(tty,TCSANOW,data)
 116 # endif
 117
 118 # ifdef TERMIO
 119 #  include <termio.h>
 120 #  define TTY_STRUCT             struct termio
 121 #  define TTY_FLAGS              c_lflag
 122 #  define TTY_get(tty,data)      ioctl(tty,TCGETA,data)
 123 #  define TTY_set(tty,data)      ioctl(tty,TCSETA,data)
 124 # endif
 125
 126 # ifdef SGTTY
 127 #  include <sgtty.h>
 128 #  define TTY_STRUCT             struct sgttyb
 129 #  define TTY_FLAGS              sg_flags
 130 #  define TTY_get(tty,data)      ioctl(tty,TIOCGETP,data)
 131 #  define TTY_set(tty,data)      ioctl(tty,TIOCSETP,data)
 132 # endif
 133
 134 # if !defined(_LIBC) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS)
 135 #  include <sys/ioctl.h>
 136 # endif
 137
 138 # ifdef OPENSSL_SYS_MSDOS
 139 #  include <conio.h>
 140 # endif
 141
 142 # ifdef OPENSSL_SYS_VMS
 143 #  include <ssdef.h>
 144 #  include <iodef.h>
 145 #  include <ttdef.h>
 146 #  include <descrip.h>
 147 struct IOSB {
 148     short iosb$w_value;
 149     short iosb$w_count;
 150     long iosb$l_info;
 151 };
 152 # endif
 153
 154 # ifndef NX509_SIG
 155 #  define NX509_SIG 32
 156 # endif
 157
 158 /* Define globals.  They are protected by a lock */
 159 # ifdef SIGACTION
 160 static struct sigaction savsig[NX509_SIG];
 161 # else
 162 static void (*savsig[NX509_SIG]) (int);
 163 # endif
 164
 165 # ifdef OPENSSL_SYS_VMS
 166 static struct IOSB iosb;
 167 static $DESCRIPTOR(terminal, "TT");
 168 static long tty_orig[3], tty_new[3]; /* XXX Is there any guarantee that this
 169                                       * will always suffice for the actual
 170                                       * structures? */
 171 static long status;
 172 static unsigned short channel = 0;
 173 # elif defined(_WIN32) && !defined(_WIN32_WCE)
 174 static DWORD tty_orig, tty_new;
 175 # else
 176 #  if !defined(OPENSSL_SYS_MSDOS) || defined(__DJGPP__)
 177 static TTY_STRUCT tty_orig, tty_new;
 178 #  endif
 179 # endif
 180 static FILE *tty_in, *tty_out;
 181 static int is_a_tty;
 182
 183 /* Declare static functions */
 184 # if !defined(OPENSSL_SYS_WINCE)
 185 static int read_till_nl(FILE *);
 186 static void recsig(int);
 187 static void pushsig(void);
 188 static void popsig(void);
 189 # endif
 190 # if defined(OPENSSL_SYS_MSDOS) && !defined(_WIN32)
 191 static int noecho_fgets(char *buf, int size, FILE *tty);
 192 # endif
 193 static int read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl);
 194
 195 static int read_string(UI *ui, UI_STRING *uis);
 196 static int write_string(UI *ui, UI_STRING *uis);
 197
 198 static int open_console(UI *ui);
 199 static int echo_console(UI *ui);
 200 static int noecho_console(UI *ui);
 201 static int close_console(UI *ui);
 202
 203 /*
 204  * The following function makes sure that info and error strings are printed
 205  * before any prompt.
 206  */
 207 static int write_string(UI *ui, UI_STRING *uis)
 208 {
 209     switch (UI_get_string_type(uis)) {
 210     case UIT_ERROR:
 211     case UIT_INFO:
 212         fputs(UI_get0_output_string(uis), tty_out);
 213         fflush(tty_out);
 214         break;
 215     case UIT_NONE:
 216     case UIT_PROMPT:
 217     case UIT_VERIFY:
 218     case UIT_BOOLEAN:
 219         break;
 220     }
 221     return 1;
 222 }
 223
 224 static int read_string(UI *ui, UI_STRING *uis)
 225 {
 226     int ok = 0;
 227
 228     switch (UI_get_string_type(uis)) {
 229     case UIT_BOOLEAN:
 230         fputs(UI_get0_output_string(uis), tty_out);
 231         fputs(UI_get0_action_string(uis), tty_out);
 232         fflush(tty_out);
 233         return read_string_inner(ui, uis,
 234                                  UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO,
 235                                  0);
 236     case UIT_PROMPT:
 237         fputs(UI_get0_output_string(uis), tty_out);
 238         fflush(tty_out);
 239         return read_string_inner(ui, uis,
 240                                  UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO,
 241                                  1);
 242     case UIT_VERIFY:
 243         fprintf(tty_out, "Verifying - %s", UI_get0_output_string(uis));
 244         fflush(tty_out);
 245         if ((ok = read_string_inner(ui, uis,
 246                                     UI_get_input_flags(uis) &
 247                                     UI_INPUT_FLAG_ECHO, 1)) <= 0)
 248             return ok;
 249         if (strcmp(UI_get0_result_string(uis), UI_get0_test_string(uis)) != 0) {
 250             fprintf(tty_out, "Verify failure\n");
 251             fflush(tty_out);
 252             return 0;
 253         }
 254         break;
 255     case UIT_NONE:
 256     case UIT_INFO:
 257     case UIT_ERROR:
 258         break;
 259     }
 260     return 1;
 261 }
 262
 263 # if !defined(OPENSSL_SYS_WINCE)
 264 /* Internal functions to read a string without echoing */
 265 static int read_till_nl(FILE *in)
 266 {
 267 #  define SIZE 4
 268     char buf[SIZE + 1];
 269
 270     do {
 271         if (!fgets(buf, SIZE, in))
 272             return 0;
 273     } while (strchr(buf, '\n') == NULL);
 274     return 1;
 275 }
 276
 277 static volatile sig_atomic_t intr_signal;
 278 # endif
 279
 280 static int read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl)
 281 {
 282     static int ps;
 283     int ok;
 284     char result[BUFSIZ];
 285     int maxsize = BUFSIZ - 1;
 286 # if !defined(OPENSSL_SYS_WINCE)
 287     char *p = NULL;
 288     int echo_eol = !echo;
 289
 290     intr_signal = 0;
 291     ok = 0;
 292     ps = 0;
 293
 294     pushsig();
 295     ps = 1;
 296
 297     if (!echo && !noecho_console(ui))
 298         goto error;
 299     ps = 2;
 300
 301     result[0] = '\0';
 302 #  if defined(_WIN32)
 303     if (is_a_tty) {
 304         DWORD numread;
 305 #   if defined(CP_UTF8)
 306         if (GetEnvironmentVariableW(L"OPENSSL_WIN32_UTF8", NULL, 0) != 0) {
 307             WCHAR wresult[BUFSIZ];
 308
 309             if (ReadConsoleW(GetStdHandle(STD_INPUT_HANDLE),
 310                          wresult, maxsize, &numread, NULL)) {
 311                 if (numread >= 2 &&
 312                     wresult[numread-2] == L'\r' &&
 313                     wresult[numread-1] == L'\n') {
 314                     wresult[numread-2] = L'\n';
 315                     numread--;
 316                 }
 317                 wresult[numread] = '\0';
 318                 if (WideCharToMultiByte(CP_UTF8, 0, wresult, -1,
 319                                         result, sizeof(result), NULL, 0) > 0)
 320                     p = result;
 321
 322                 OPENSSL_cleanse(wresult, sizeof(wresult));
 323             }
 324         } else
 325 #   endif
 326         if (ReadConsoleA(GetStdHandle(STD_INPUT_HANDLE),
 327                          result, maxsize, &numread, NULL)) {
 328             if (numread >= 2 &&
 329                 result[numread-2] == '\r' && result[numread-1] == '\n') {
 330                 result[numread-2] = '\n';
 331                 numread--;
 332             }
 333             result[numread] = '\0';
 334             p = result;
 335         }
 336     } else
 337 #  elif defined(OPENSSL_SYS_MSDOS)
 338     if (!echo) {
 339         noecho_fgets(result, maxsize, tty_in);
 340         p = result;             /* FIXME: noecho_fgets doesn't return errors */
 341     } else
 342 #  endif
 343     p = fgets(result, maxsize, tty_in);
 344     if (p == NULL)
 345         goto error;
 346     if (feof(tty_in))
 347         goto error;
 348     if (ferror(tty_in))
 349         goto error;
 350     if ((p = (char *)strchr(result, '\n')) != NULL) {
 351         if (strip_nl)
 352             *p = '\0';
 353     } else if (!read_till_nl(tty_in))
 354         goto error;
 355     if (UI_set_result(ui, uis, result) >= 0)
 356         ok = 1;
 357
 358  error:
 359     if (intr_signal == SIGINT)
 360         ok = -1;
 361     if (echo_eol)
 362         fprintf(tty_out, "\n");
 363     if (ps >= 2 && !echo && !echo_console(ui))
 364         ok = 0;
 365
 366     if (ps >= 1)
 367         popsig();
 368 # else
 369     ok = 1;
 370 # endif
 371
 372     OPENSSL_cleanse(result, BUFSIZ);
 373     return ok;
 374 }
 375
 376 /* Internal functions to open, handle and close a channel to the console.  */
 377 static int open_console(UI *ui)
 378 {
 379     CRYPTO_THREAD_write_lock(ui->lock);
 380     is_a_tty = 1;
 381
 382 # if defined(OPENSSL_SYS_VXWORKS)
 383     tty_in = stdin;
 384     tty_out = stderr;
 385 # elif defined(_WIN32) && !defined(_WIN32_WCE)
 386     if ((tty_out = fopen("conout$", "w")) == NULL)
 387         tty_out = stderr;
 388
 389     if (GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), &tty_orig)) {
 390         tty_in = stdin;
 391     } else {
 392         is_a_tty = 0;
 393         if ((tty_in = fopen("conin$", "r")) == NULL)
 394             tty_in = stdin;
 395     }
 396 # else
 397 #  ifdef OPENSSL_SYS_MSDOS
 398 #   define DEV_TTY "con"
 399 #  else
 400 #   define DEV_TTY "/dev/tty"
 401 #  endif
 402     if ((tty_in = fopen(DEV_TTY, "r")) == NULL)
 403         tty_in = stdin;
 404     if ((tty_out = fopen(DEV_TTY, "w")) == NULL)
 405         tty_out = stderr;
 406 # endif
 407
 408 # if defined(TTY_get) && !defined(OPENSSL_SYS_VMS)
 409     if (TTY_get(fileno(tty_in), &tty_orig) == -1) {
 410 #  ifdef ENOTTY
 411         if (errno == ENOTTY)
 412             is_a_tty = 0;
 413         else
 414 #  endif
 415 #  ifdef EINVAL
 416             /*
 417              * Ariel Glenn reports that solaris can return EINVAL instead.
 418              * This should be ok
 419              */
 420         if (errno == EINVAL)
 421             is_a_tty = 0;
 422         else
 423 #  endif
 424 #  ifdef ENXIO
 425             /*
 426              * Solaris can return ENXIO.
 427              * This should be ok
 428              */
 429         if (errno == ENXIO)
 430             is_a_tty = 0;
 431         else
 432 #  endif
 433 #  ifdef EIO
 434             /*
 435              * Linux can return EIO.
 436              * This should be ok
 437              */
 438         if (errno == EIO)
 439             is_a_tty = 0;
 440         else
 441 #  endif
 442 #  ifdef ENODEV
 443             /*
 444              * MacOS X returns ENODEV (Operation not supported by device),
 445              * which seems appropriate.
 446              */
 447         if (errno == ENODEV)
 448             is_a_tty = 0;
 449         else
 450 #  endif
 451             {
 452                 char tmp_num[10];
 453                 BIO_snprintf(tmp_num, sizeof(tmp_num) - 1, "%d", errno);
 454                 UIerr(UI_F_OPEN_CONSOLE, UI_R_UNKNOWN_TTYGET_ERRNO_VALUE);
 455                 ERR_add_error_data(2, "errno=", tmp_num);
 456
 457                 return 0;
 458             }
 459     }
 460 # endif
 461 # ifdef OPENSSL_SYS_VMS
 462     status = sys$assign(&terminal, &channel, 0, 0);
 463
 464     /* if there isn't a TT device, something is very wrong */
 465     if (status != SS$_NORMAL) {
 466         char tmp_num[12];
 467
 468         BIO_snprintf(tmp_num, sizeof(tmp_num) - 1, "%%X%08X", status);
 469         UIerr(UI_F_OPEN_CONSOLE, UI_R_SYSASSIGN_ERROR);
 470         ERR_add_error_data(2, "status=", tmp_num);
 471         return 0;
 472     }
 473
 474     status = sys$qiow(0, channel, IO$_SENSEMODE, &iosb, 0, 0, tty_orig, 12,
 475                       0, 0, 0, 0);
 476
 477     /* If IO$_SENSEMODE doesn't work, this is not a terminal device */
 478     if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
 479         is_a_tty = 0;
 480 # endif
 481     return 1;
 482 }
 483
 484 static int noecho_console(UI *ui)
 485 {
 486 # ifdef TTY_FLAGS
 487     memcpy(&(tty_new), &(tty_orig), sizeof(tty_orig));
 488     tty_new.TTY_FLAGS &= ~ECHO;
 489 # endif
 490
 491 # if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
 492     if (is_a_tty && (TTY_set(fileno(tty_in), &tty_new) == -1))
 493         return 0;
 494 # endif
 495 # ifdef OPENSSL_SYS_VMS
 496     if (is_a_tty) {
 497         tty_new[0] = tty_orig[0];
 498         tty_new[1] = tty_orig[1] | TT$M_NOECHO;
 499         tty_new[2] = tty_orig[2];
 500         status = sys$qiow(0, channel, IO$_SETMODE, &iosb, 0, 0, tty_new, 12,
 501                           0, 0, 0, 0);
 502         if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL)) {
 503             char tmp_num[2][12];
 504
 505             BIO_snprintf(tmp_num[0], sizeof(tmp_num[0]) - 1, "%%X%08X",
 506                          status);
 507             BIO_snprintf(tmp_num[1], sizeof(tmp_num[1]) - 1, "%%X%08X",
 508                          iosb.iosb$w_value);
 509             UIerr(UI_F_NOECHO_CONSOLE, UI_R_SYSQIOW_ERROR);
 510             ERR_add_error_data(5, "status=", tmp_num[0],
 511                                ",", "iosb.iosb$w_value=", tmp_num[1]);
 512             return 0;
 513         }
 514     }
 515 # endif
 516 # if defined(_WIN32) && !defined(_WIN32_WCE)
 517     if (is_a_tty) {
 518         tty_new = tty_orig;
 519         tty_new &= ~ENABLE_ECHO_INPUT;
 520         SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), tty_new);
 521     }
 522 # endif
 523     return 1;
 524 }
 525
 526 static int echo_console(UI *ui)
 527 {
 528 # if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
 529     memcpy(&(tty_new), &(tty_orig), sizeof(tty_orig));
 530     if (is_a_tty && (TTY_set(fileno(tty_in), &tty_new) == -1))
 531         return 0;
 532 # endif
 533 # ifdef OPENSSL_SYS_VMS
 534     if (is_a_tty) {
 535         tty_new[0] = tty_orig[0];
 536         tty_new[1] = tty_orig[1];
 537         tty_new[2] = tty_orig[2];
 538         status = sys$qiow(0, channel, IO$_SETMODE, &iosb, 0, 0, tty_new, 12,
 539                           0, 0, 0, 0);
 540         if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL)) {
 541             char tmp_num[2][12];
 542
 543             BIO_snprintf(tmp_num[0], sizeof(tmp_num[0]) - 1, "%%X%08X",
 544                          status);
 545             BIO_snprintf(tmp_num[1], sizeof(tmp_num[1]) - 1, "%%X%08X",
 546                          iosb.iosb$w_value);
 547             UIerr(UI_F_ECHO_CONSOLE, UI_R_SYSQIOW_ERROR);
 548             ERR_add_error_data(5, "status=", tmp_num[0],
 549                                ",", "iosb.iosb$w_value=", tmp_num[1]);
 550             return 0;
 551         }
 552     }
 553 # endif
 554 # if defined(_WIN32) && !defined(_WIN32_WCE)
 555     if (is_a_tty) {
 556         tty_new = tty_orig;
 557         SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), tty_new);
 558     }
 559 # endif
 560     return 1;
 561 }
 562
 563 static int close_console(UI *ui)
 564 {
 565     if (tty_in != stdin)
 566         fclose(tty_in);
 567     if (tty_out != stderr)
 568         fclose(tty_out);
 569 # ifdef OPENSSL_SYS_VMS
 570     status = sys$dassgn(channel);
 571     if (status != SS$_NORMAL) {
 572         char tmp_num[12];
 573
 574         BIO_snprintf(tmp_num, sizeof(tmp_num) - 1, "%%X%08X", status);
 575         UIerr(UI_F_CLOSE_CONSOLE, UI_R_SYSDASSGN_ERROR);
 576         ERR_add_error_data(2, "status=", tmp_num);
 577         return 0;
 578     }
 579 # endif
 580     CRYPTO_THREAD_unlock(ui->lock);
 581
 582     return 1;
 583 }
 584
 585 # if !defined(OPENSSL_SYS_WINCE)
 586 /* Internal functions to handle signals and act on them */
 587 static void pushsig(void)
 588 {
 589 #  ifndef OPENSSL_SYS_WIN32
 590     int i;
 591 #  endif
 592 #  ifdef SIGACTION
 593     struct sigaction sa;
 594
 595     memset(&sa, 0, sizeof(sa));
 596     sa.sa_handler = recsig;
 597 #  endif
 598
 599 #  ifdef OPENSSL_SYS_WIN32
 600     savsig[SIGABRT] = signal(SIGABRT, recsig);
 601     savsig[SIGFPE] = signal(SIGFPE, recsig);
 602     savsig[SIGILL] = signal(SIGILL, recsig);
 603     savsig[SIGINT] = signal(SIGINT, recsig);
 604     savsig[SIGSEGV] = signal(SIGSEGV, recsig);
 605     savsig[SIGTERM] = signal(SIGTERM, recsig);
 606 #  else
 607     for (i = 1; i < NX509_SIG; i++) {
 608 #   ifdef SIGUSR1
 609         if (i == SIGUSR1)
 610             continue;
 611 #   endif
 612 #   ifdef SIGUSR2
 613         if (i == SIGUSR2)
 614             continue;
 615 #   endif
 616 #   ifdef SIGKILL
 617         if (i == SIGKILL)       /* We can't make any action on that. */
 618             continue;
 619 #   endif
 620 #   ifdef SIGACTION
 621         sigaction(i, &sa, &savsig[i]);
 622 #   else
 623         savsig[i] = signal(i, recsig);
 624 #   endif
 625     }
 626 #  endif
 627
 628 #  ifdef SIGWINCH
 629     signal(SIGWINCH, SIG_DFL);
 630 #  endif
 631 }
 632
 633 static void popsig(void)
 634 {
 635 #  ifdef OPENSSL_SYS_WIN32
 636     signal(SIGABRT, savsig[SIGABRT]);
 637     signal(SIGFPE, savsig[SIGFPE]);
 638     signal(SIGILL, savsig[SIGILL]);
 639     signal(SIGINT, savsig[SIGINT]);
 640     signal(SIGSEGV, savsig[SIGSEGV]);
 641     signal(SIGTERM, savsig[SIGTERM]);
 642 #  else
 643     int i;
 644     for (i = 1; i < NX509_SIG; i++) {
 645 #   ifdef SIGUSR1
 646         if (i == SIGUSR1)
 647             continue;
 648 #   endif
 649 #   ifdef SIGUSR2
 650         if (i == SIGUSR2)
 651             continue;
 652 #   endif
 653 #   ifdef SIGACTION
 654         sigaction(i, &savsig[i], NULL);
 655 #   else
 656         signal(i, savsig[i]);
 657 #   endif
 658     }
 659 #  endif
 660 }
 661
 662 static void recsig(int i)
 663 {
 664     intr_signal = i;
 665 }
 666 # endif
 667
 668 /* Internal functions specific for Windows */
 669 # if defined(OPENSSL_SYS_MSDOS) && !defined(_WIN32)
 670 static int noecho_fgets(char *buf, int size, FILE *tty)
 671 {
 672     int i;
 673     char *p;
 674
 675     p = buf;
 676     for (;;) {
 677         if (size == 0) {
 678             *p = '\0';
 679             break;
 680         }
 681         size--;
 682 #  if defined(_WIN32)
 683         i = _getch();
 684 #  else
 685         i = getch();
 686 #  endif
 687         if (i == '\r')
 688             i = '\n';
 689         *(p++) = i;
 690         if (i == '\n') {
 691             *p = '\0';
 692             break;
 693         }
 694     }
 695 #  ifdef WIN_CONSOLE_BUG
 696     /*
 697      * Win95 has several evil console bugs: one of these is that the last
 698      * character read using getch() is passed to the next read: this is
 699      * usually a CR so this can be trouble. No STDIO fix seems to work but
 700      * flushing the console appears to do the trick.
 701      */
 702     {
 703         HANDLE inh;
 704         inh = GetStdHandle(STD_INPUT_HANDLE);
 705         FlushConsoleInputBuffer(inh);
 706     }
 707 #  endif
 708     return strlen(buf);
 709 }
 710 # endif
 711
 712 static UI_METHOD ui_openssl = {
 713     "OpenSSL default user interface",
 714     open_console,
 715     write_string,
 716     NULL,                       /* No flusher is needed for command lines */
 717     read_string,
 718     close_console,
 719     NULL
 720 };
 721
 722 /* The method with all the built-in console thingies */
 723 UI_METHOD *UI_OpenSSL(void)
 724 {
 725     return &ui_openssl;
 726 }
 727
 728 static const UI_METHOD *default_UI_meth = &ui_openssl;
 729
 730 #else
 731
 732 static const UI_METHOD *default_UI_meth = NULL;
 733
 734 #endif
 735
 736 void UI_set_default_method(const UI_METHOD *meth)
 737 {
 738     default_UI_meth = meth;
 739 }
 740
 741 const UI_METHOD *UI_get_default_method(void)
 742 {
 743     return default_UI_meth;
 744 }