crypto/ui/ui_openssl.c

   1 /* crypto/ui/ui_openssl.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Written by Richard Levitte (richard@levitte.org) and others
   3  * for the OpenSSL project 2001.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2001 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    openssl-core@openssl.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 /* The lowest level part of this file was previously in crypto/des/read_pwd.c,
  60  * Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  61  * All rights reserved.
  62  *
  63  * This package is an SSL implementation written
  64  * by Eric Young (eay@cryptsoft.com).
  65  * The implementation was written so as to conform with Netscapes SSL.
  66  *
  67  * This library is free for commercial and non-commercial use as long as
  68  * the following conditions are aheared to.  The following conditions
  69  * apply to all code found in this distribution, be it the RC4, RSA,
  70  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  71  * included with this distribution is covered by the same copyright terms
  72  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  73  *
  74  * Copyright remains Eric Young's, and as such any Copyright notices in
  75  * the code are not to be removed.
  76  * If this package is used in a product, Eric Young should be given attribution
  77  * as the author of the parts of the library used.
  78  * This can be in the form of a textual message at program startup or
  79  * in documentation (online or textual) provided with the package.
  80  *
  81  * Redistribution and use in source and binary forms, with or without
  82  * modification, are permitted provided that the following conditions
  83  * are met:
  84  * 1. Redistributions of source code must retain the copyright
  85  *    notice, this list of conditions and the following disclaimer.
  86  * 2. Redistributions in binary form must reproduce the above copyright
  87  *    notice, this list of conditions and the following disclaimer in the
  88  *    documentation and/or other materials provided with the distribution.
  89  * 3. All advertising materials mentioning features or use of this software
  90  *    must display the following acknowledgement:
  91  *    "This product includes cryptographic software written by
  92  *     Eric Young (eay@cryptsoft.com)"
  93  *    The word 'cryptographic' can be left out if the rouines from the library
  94  *    being used are not cryptographic related :-).
  95  * 4. If you include any Windows specific code (or a derivative thereof) from
  96  *    the apps directory (application code) you must include an acknowledgement:
  97  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  98  *
  99  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
 100  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 101  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 102  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 103  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 104  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 105  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 106  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 107  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 108  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 109  * SUCH DAMAGE.
 110  *
 111  * The licence and distribution terms for any publically available version or
 112  * derivative of this code cannot be changed.  i.e. this code cannot simply be
 113  * copied and put under another distribution licence
 114  * [including the GNU Public Licence.]
 115  */
 116
 117
 118 #include <openssl/e_os2.h>
 119
 120 #if !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS)
 121 # ifdef OPENSSL_UNISTD
 122 #  include OPENSSL_UNISTD
 123 # else
 124 #  include <unistd.h>
 125 # endif
 126 /* If unistd.h defines _POSIX_VERSION, we conclude that we
 127  * are on a POSIX system and have sigaction and termios. */
 128 # if defined(_POSIX_VERSION)
 129
 130 #  define SIGACTION
 131 #  if !defined(TERMIOS) && !defined(TERMIO) && !defined(SGTTY)
 132 #   define TERMIOS
 133 #  endif
 134
 135 # endif
 136 #endif
 137
 138 #ifdef WIN16TTY
 139 # undef OPENSSL_SYS_WIN16
 140 # undef WIN16
 141 # undef _WINDOWS
 142 # include <graph.h>
 143 #endif
 144
 145 /* 06-Apr-92 Luke Brennan    Support for VMS */
 146 #include "ui_locl.h"
 147 #include "cryptlib.h"
 148 #include <signal.h>
 149 #include <stdio.h>
 150 #include <string.h>
 151 #include <errno.h>
 152
 153 #ifdef OPENSSL_SYS_VMS          /* prototypes for sys$whatever */
 154 # include <starlet.h>
 155 # ifdef __DECC
 156 #  pragma message disable DOLLARID
 157 # endif
 158 #endif
 159
 160 #ifdef WIN_CONSOLE_BUG
 161 # include <windows.h>
 162 # include <wincon.h>
 163 #endif
 164
 165
 166 /* There are 5 types of terminal interface supported,
 167  * TERMIO, TERMIOS, VMS, MSDOS and SGTTY
 168  */
 169
 170 #if defined(__sgi) && !defined(TERMIOS)
 171 # define TERMIOS
 172 # undef  TERMIO
 173 # undef  SGTTY
 174 #endif
 175
 176 #if defined(linux) && !defined(TERMIO)
 177 # undef  TERMIOS
 178 # define TERMIO
 179 # undef  SGTTY
 180 #endif
 181
 182 #ifdef _LIBC
 183 # undef  TERMIOS
 184 # define TERMIO
 185 # undef  SGTTY
 186 #endif
 187
 188 #if !defined(TERMIO) && !defined(TERMIOS) && !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_MACINTOSH_CLASSIC) && !defined(MAC_OS_GUSI_SOURCE)
 189 # undef  TERMIOS
 190 # undef  TERMIO
 191 # define SGTTY
 192 #endif
 193
 194 #if defined(OPENSSL_SYS_VSWORKS)
 195 #undef TERMIOS
 196 #undef TERMIO
 197 #undef SGTTY
 198 #endif
 199
 200 #ifdef TERMIOS
 201 # include <termios.h>
 202 # define TTY_STRUCT             struct termios
 203 # define TTY_FLAGS              c_lflag
 204 # define TTY_get(tty,data)      tcgetattr(tty,data)
 205 # define TTY_set(tty,data)      tcsetattr(tty,TCSANOW,data)
 206 #endif
 207
 208 #ifdef TERMIO
 209 # include <termio.h>
 210 # define TTY_STRUCT             struct termio
 211 # define TTY_FLAGS              c_lflag
 212 # define TTY_get(tty,data)      ioctl(tty,TCGETA,data)
 213 # define TTY_set(tty,data)      ioctl(tty,TCSETA,data)
 214 #endif
 215
 216 #ifdef SGTTY
 217 # include <sgtty.h>
 218 # define TTY_STRUCT             struct sgttyb
 219 # define TTY_FLAGS              sg_flags
 220 # define TTY_get(tty,data)      ioctl(tty,TIOCGETP,data)
 221 # define TTY_set(tty,data)      ioctl(tty,TIOCSETP,data)
 222 #endif
 223
 224 #if !defined(_LIBC) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_MACINTOSH_CLASSIC)
 225 # include <sys/ioctl.h>
 226 #endif
 227
 228 #ifdef OPENSSL_SYS_MSDOS
 229 # include <conio.h>
 230 #endif
 231
 232 #ifdef OPENSSL_SYS_VMS
 233 # include <ssdef.h>
 234 # include <iodef.h>
 235 # include <ttdef.h>
 236 # include <descrip.h>
 237 struct IOSB {
 238         short iosb$w_value;
 239         short iosb$w_count;
 240         long  iosb$l_info;
 241         };
 242 #endif
 243
 244 #if defined(OPENSSL_SYS_MACINTOSH_CLASSIC) || defined(MAC_OS_GUSI_SOURCE)
 245 /*
 246  * This one needs work. As a matter of fact the code is unoperational
 247  * and this is only a trick to get it compiled.
 248  *                                      <appro@fy.chalmers.se>
 249  */
 250 # define TTY_STRUCT int
 251 #endif
 252
 253 #ifndef NX509_SIG
 254 # define NX509_SIG 32
 255 #endif
 256
 257
 258 /* Define globals.  They are protected by a lock */
 259 #ifdef SIGACTION
 260 static struct sigaction savsig[NX509_SIG];
 261 #else
 262 static void (*savsig[NX509_SIG])(int );
 263 #endif
 264
 265 #ifdef OPENSSL_SYS_VMS
 266 static struct IOSB iosb;
 267 static $DESCRIPTOR(terminal,"TT");
 268 static long tty_orig[3], tty_new[3]; /* XXX   Is there any guarantee that this will always suffice for the actual structures? */
 269 static long status;
 270 static unsigned short channel = 0;
 271 #else
 272 #if !defined(OPENSSL_SYS_MSDOS) || defined(__DJGPP__)
 273 static TTY_STRUCT tty_orig,tty_new;
 274 #endif
 275 #endif
 276 static FILE *tty_in, *tty_out;
 277 static int is_a_tty;
 278
 279 /* Declare static functions */
 280 static void read_till_nl(FILE *);
 281 static void recsig(int);
 282 static void pushsig(void);
 283 static void popsig(void);
 284 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN16)
 285 static int noecho_fgets(char *buf, int size, FILE *tty);
 286 #endif
 287 static int read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl);
 288
 289 static int read_string(UI *ui, UI_STRING *uis);
 290 static int write_string(UI *ui, UI_STRING *uis);
 291
 292 static int open_console(UI *ui);
 293 static int echo_console(UI *ui);
 294 static int noecho_console(UI *ui);
 295 static int close_console(UI *ui);
 296
 297 static UI_METHOD ui_openssl =
 298         {
 299         "OpenSSL default user interface",
 300         open_console,
 301         write_string,
 302         NULL,                   /* No flusher is needed for command lines */
 303         read_string,
 304         close_console,
 305         NULL
 306         };
 307
 308 /* The method with all the built-in thingies */
 309 UI_METHOD *UI_OpenSSL(void)
 310         {
 311         return &ui_openssl;
 312         }
 313
 314 /* The following function makes sure that info and error strings are printed
 315    before any prompt. */
 316 static int write_string(UI *ui, UI_STRING *uis)
 317         {
 318         switch (UI_get_string_type(uis))
 319                 {
 320         case UIT_ERROR:
 321         case UIT_INFO:
 322                 fputs(UI_get0_output_string(uis), tty_out);
 323                 fflush(tty_out);
 324                 break;
 325         default:
 326                 break;
 327                 }
 328         return 1;
 329         }
 330
 331 static int read_string(UI *ui, UI_STRING *uis)
 332         {
 333         int ok = 0;
 334
 335         switch (UI_get_string_type(uis))
 336                 {
 337         case UIT_BOOLEAN:
 338                 fputs(UI_get0_output_string(uis), tty_out);
 339                 fputs(UI_get0_action_string(uis), tty_out);
 340                 fflush(tty_out);
 341                 return read_string_inner(ui, uis,
 342                         UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 0);
 343         case UIT_PROMPT:
 344                 fputs(UI_get0_output_string(uis), tty_out);
 345                 fflush(tty_out);
 346                 return read_string_inner(ui, uis,
 347                         UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 1);
 348         case UIT_VERIFY:
 349                 fprintf(tty_out,"Verifying - %s",
 350                         UI_get0_output_string(uis));
 351                 fflush(tty_out);
 352                 if ((ok = read_string_inner(ui, uis,
 353                         UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 1)) <= 0)
 354                         return ok;
 355                 if (strcmp(UI_get0_result_string(uis),
 356                         UI_get0_test_string(uis)) != 0)
 357                         {
 358                         fprintf(tty_out,"Verify failure\n");
 359                         fflush(tty_out);
 360                         return 0;
 361                         }
 362                 break;
 363         default:
 364                 break;
 365                 }
 366         return 1;
 367         }
 368
 369
 370 /* Internal functions to read a string without echoing */
 371 static void read_till_nl(FILE *in)
 372         {
 373 #define SIZE 4
 374         char buf[SIZE+1];
 375
 376         do      {
 377                 fgets(buf,SIZE,in);
 378                 } while (strchr(buf,'\n') == NULL);
 379         }
 380
 381 static sig_atomic_t intr_signal;
 382
 383 static int read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl)
 384         {
 385         static int ps;
 386         int ok;
 387         char result[BUFSIZ];
 388         int maxsize = BUFSIZ-1;
 389         char *p;
 390
 391 #ifndef OPENSSL_SYS_WIN16
 392         intr_signal=0;
 393         ok=0;
 394         ps=0;
 395
 396         pushsig();
 397         ps=1;
 398
 399         if (!echo && !noecho_console(ui))
 400                 goto error;
 401         ps=2;
 402
 403         result[0]='\0';
 404 #ifdef OPENSSL_SYS_MSDOS
 405         if (!echo)
 406                 {
 407                 noecho_fgets(result,maxsize,tty_in);
 408                 p=result; /* FIXME: noecho_fgets doesn't return errors */
 409                 }
 410         else
 411                 p=fgets(result,maxsize,tty_in);
 412 #else
 413         p=fgets(result,maxsize,tty_in);
 414 #endif
 415         if(!p)
 416                 goto error;
 417         if (feof(tty_in)) goto error;
 418         if (ferror(tty_in)) goto error;
 419         if ((p=(char *)strchr(result,'\n')) != NULL)
 420                 {
 421                 if (strip_nl)
 422                         *p='\0';
 423                 }
 424         else
 425                 read_till_nl(tty_in);
 426         if (UI_set_result(ui, uis, result) >= 0)
 427                 ok=1;
 428
 429 error:
 430         if (intr_signal == SIGINT)
 431                 ok=-1;
 432         if (!echo) fprintf(tty_out,"\n");
 433         if (ps >= 2 && !echo && !echo_console(ui))
 434                 ok=0;
 435
 436         if (ps >= 1)
 437                 popsig();
 438 #else
 439         ok=1;
 440 #endif
 441
 442         memset(result,0,BUFSIZ);
 443         return ok;
 444         }
 445
 446
 447 /* Internal functions to open, handle and close a channel to the console.  */
 448 static int open_console(UI *ui)
 449         {
 450         CRYPTO_w_lock(CRYPTO_LOCK_UI);
 451         is_a_tty = 1;
 452
 453 #if defined(OPENSSL_SYS_MACINTOSH_CLASSIC) || defined(OPENSSL_SYS_VSWORKS)
 454         tty_in=stdin;
 455         tty_out=stderr;
 456 #else
 457 #  ifdef OPENSSL_SYS_MSDOS
 458 #    define DEV_TTY "con"
 459 #  else
 460 #    define DEV_TTY "/dev/tty"
 461 #  endif
 462         if ((tty_in=fopen(DEV_TTY,"r")) == NULL)
 463                 tty_in=stdin;
 464         if ((tty_out=fopen(DEV_TTY,"w")) == NULL)
 465                 tty_out=stderr;
 466 #endif
 467
 468 #if defined(TTY_get) && !defined(OPENSSL_SYS_VMS)
 469         if (TTY_get(fileno(tty_in),&tty_orig) == -1)
 470                 {
 471 #ifdef ENOTTY
 472                 if (errno == ENOTTY)
 473                         is_a_tty=0;
 474                 else
 475 #endif
 476 #ifdef EINVAL
 477                 /* Ariel Glenn ariel@columbia.edu reports that solaris
 478                  * can return EINVAL instead.  This should be ok */
 479                 if (errno == EINVAL)
 480                         is_a_tty=0;
 481                 else
 482 #endif
 483                         return 0;
 484                 }
 485 #endif
 486 #ifdef OPENSSL_SYS_VMS
 487         status = sys$assign(&terminal,&channel,0,0);
 488         if (status != SS$_NORMAL)
 489                 return 0;
 490         status=sys$qiow(0,channel,IO$_SENSEMODE,&iosb,0,0,tty_orig,12,0,0,0,0);
 491         if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
 492                 return 0;
 493 #endif
 494         return 1;
 495         }
 496
 497 static int noecho_console(UI *ui)
 498         {
 499 #ifdef TTY_FLAGS
 500         memcpy(&(tty_new),&(tty_orig),sizeof(tty_orig));
 501         tty_new.TTY_FLAGS &= ~ECHO;
 502 #endif
 503
 504 #if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
 505         if (is_a_tty && (TTY_set(fileno(tty_in),&tty_new) == -1))
 506                 return 0;
 507 #endif
 508 #ifdef OPENSSL_SYS_VMS
 509         tty_new[0] = tty_orig[0];
 510         tty_new[1] = tty_orig[1] | TT$M_NOECHO;
 511         tty_new[2] = tty_orig[2];
 512         status = sys$qiow(0,channel,IO$_SETMODE,&iosb,0,0,tty_new,12,0,0,0,0);
 513         if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
 514                 return 0;
 515 #endif
 516         return 1;
 517         }
 518
 519 static int echo_console(UI *ui)
 520         {
 521 #if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
 522         memcpy(&(tty_new),&(tty_orig),sizeof(tty_orig));
 523         tty_new.TTY_FLAGS |= ECHO;
 524 #endif
 525
 526 #if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
 527         if (is_a_tty && (TTY_set(fileno(tty_in),&tty_new) == -1))
 528                 return 0;
 529 #endif
 530 #ifdef OPENSSL_SYS_VMS
 531         tty_new[0] = tty_orig[0];
 532         tty_new[1] = tty_orig[1] & ~TT$M_NOECHO;
 533         tty_new[2] = tty_orig[2];
 534         status = sys$qiow(0,channel,IO$_SETMODE,&iosb,0,0,tty_new,12,0,0,0,0);
 535         if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
 536                 return 0;
 537 #endif
 538         return 1;
 539         }
 540
 541 static int close_console(UI *ui)
 542         {
 543         if (tty_in != stderr) fclose(tty_in);
 544         if (tty_out != stderr) fclose(tty_out);
 545 #ifdef OPENSSL_SYS_VMS
 546         status = sys$dassgn(channel);
 547 #endif
 548         CRYPTO_w_unlock(CRYPTO_LOCK_UI);
 549
 550         return 1;
 551         }
 552
 553
 554 /* Internal functions to handle signals and act on them */
 555 static void pushsig(void)
 556         {
 557         int i;
 558 #ifdef SIGACTION
 559         struct sigaction sa;
 560
 561         memset(&sa,0,sizeof sa);
 562         sa.sa_handler=recsig;
 563 #endif
 564
 565         for (i=1; i<NX509_SIG; i++)
 566                 {
 567 #ifdef SIGUSR1
 568                 if (i == SIGUSR1)
 569                         continue;
 570 #endif
 571 #ifdef SIGUSR2
 572                 if (i == SIGUSR2)
 573                         continue;
 574 #endif
 575 #ifdef SIGKILL
 576                 if (i == SIGKILL) /* We can't make any action on that. */
 577                         continue;
 578 #endif
 579 #ifdef SIGACTION
 580                 sigaction(i,&sa,&savsig[i]);
 581 #else
 582                 savsig[i]=signal(i,recsig);
 583 #endif
 584                 }
 585
 586 #ifdef SIGWINCH
 587         signal(SIGWINCH,SIG_DFL);
 588 #endif
 589         }
 590
 591 static void popsig(void)
 592         {
 593         int i;
 594
 595         for (i=1; i<NX509_SIG; i++)
 596                 {
 597 #ifdef SIGUSR1
 598                 if (i == SIGUSR1)
 599                         continue;
 600 #endif
 601 #ifdef SIGUSR2
 602                 if (i == SIGUSR2)
 603                         continue;
 604 #endif
 605 #ifdef SIGACTION
 606                 sigaction(i,&savsig[i],NULL);
 607 #else
 608                 signal(i,savsig[i]);
 609 #endif
 610                 }
 611         }
 612
 613 static void recsig(int i)
 614         {
 615         intr_signal=i;
 616         }
 617
 618 /* Internal functions specific for Windows */
 619 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN16)
 620 static int noecho_fgets(char *buf, int size, FILE *tty)
 621         {
 622         int i;
 623         char *p;
 624
 625         p=buf;
 626         for (;;)
 627                 {
 628                 if (size == 0)
 629                         {
 630                         *p='\0';
 631                         break;
 632                         }
 633                 size--;
 634 #ifdef WIN16TTY
 635                 i=_inchar();
 636 #else
 637                 i=getch();
 638 #endif
 639                 if (i == '\r') i='\n';
 640                 *(p++)=i;
 641                 if (i == '\n')
 642                         {
 643                         *p='\0';
 644                         break;
 645                         }
 646                 }
 647 #ifdef WIN_CONSOLE_BUG
 648 /* Win95 has several evil console bugs: one of these is that the
 649  * last character read using getch() is passed to the next read: this is
 650  * usually a CR so this can be trouble. No STDIO fix seems to work but
 651  * flushing the console appears to do the trick.
 652  */
 653                 {
 654                         HANDLE inh;
 655                         inh = GetStdHandle(STD_INPUT_HANDLE);
 656                         FlushConsoleInputBuffer(inh);
 657                 }
 658 #endif
 659         return(strlen(buf));
 660         }
 661 #endif