xref: /openssl/crypto/ui/ui_openssl.c (revision fecb3aae)
1 /*
2  * Copyright 2001-2022 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 "internal/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 #  include <unistd.h>
38 /*
39  * If unistd.h defines _POSIX_VERSION, we conclude that we are on a POSIX
40  * system and have sigaction and termios.
41  */
42 #  if defined(_POSIX_VERSION) && _POSIX_VERSION>=199309L
43 
44 #   define SIGACTION
45 #   if !defined(TERMIOS) && !defined(TERMIO) && !defined(SGTTY)
46 #    define TERMIOS
47 #   endif
48 
49 #  endif
50 # endif
51 
52 # include "ui_local.h"
53 # include "internal/cryptlib.h"
54 
55 # ifdef OPENSSL_SYS_VMS          /* prototypes for sys$whatever */
56 #  include <starlet.h>
57 #  ifdef __DECC
58 #   pragma message disable DOLLARID
59 #  endif
60 # endif
61 
62 # ifdef WIN_CONSOLE_BUG
63 #  include <windows.h>
64 #  ifndef OPENSSL_SYS_WINCE
65 #   include <wincon.h>
66 #  endif
67 # endif
68 
69 /*
70  * There are 6 types of terminal interface supported, TERMIO, TERMIOS, VMS,
71  * MSDOS, WIN32 Console and SGTTY.
72  *
73  * If someone defines one of the macros TERMIO, TERMIOS or SGTTY, it will
74  * remain respected.  Otherwise, we default to TERMIOS except for a few
75  * systems that require something different.
76  *
77  * Note: we do not use SGTTY unless it's defined by the configuration.  We
78  * may eventually opt to remove its use entirely.
79  */
80 
81 # if !defined(TERMIOS) && !defined(TERMIO) && !defined(SGTTY)
82 
83 #  if defined(_LIBC)
84 #   undef  TERMIOS
85 #   define TERMIO
86 #   undef  SGTTY
87 /*
88  * We know that VMS, MSDOS, VXWORKS, use entirely other mechanisms.
89  */
90 #  elif !defined(OPENSSL_SYS_VMS) \
91         && !defined(OPENSSL_SYS_MSDOS) \
92         && !defined(OPENSSL_SYS_VXWORKS)
93 #   define TERMIOS
94 #   undef  TERMIO
95 #   undef  SGTTY
96 #  endif
97 
98 # endif
99 
100 # if defined(OPENSSL_SYS_VXWORKS)
101 #  undef TERMIOS
102 #  undef TERMIO
103 #  undef SGTTY
104 # endif
105 
106 # ifdef TERMIOS
107 #  include <termios.h>
108 #  define TTY_STRUCT             struct termios
109 #  define TTY_FLAGS              c_lflag
110 #  define TTY_get(tty,data)      tcgetattr(tty,data)
111 #  define TTY_set(tty,data)      tcsetattr(tty,TCSANOW,data)
112 # endif
113 
114 # ifdef TERMIO
115 #  include <termio.h>
116 #  define TTY_STRUCT             struct termio
117 #  define TTY_FLAGS              c_lflag
118 #  define TTY_get(tty,data)      ioctl(tty,TCGETA,data)
119 #  define TTY_set(tty,data)      ioctl(tty,TCSETA,data)
120 # endif
121 
122 # ifdef SGTTY
123 #  include <sgtty.h>
124 #  define TTY_STRUCT             struct sgttyb
125 #  define TTY_FLAGS              sg_flags
126 #  define TTY_get(tty,data)      ioctl(tty,TIOCGETP,data)
127 #  define TTY_set(tty,data)      ioctl(tty,TIOCSETP,data)
128 # endif
129 
130 # if !defined(_LIBC) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS) && ! (defined(OPENSSL_SYS_TANDEM) && defined(_SPT_MODEL_))
131 #  include <sys/ioctl.h>
132 # endif
133 
134 # ifdef OPENSSL_SYS_MSDOS
135 #  include <conio.h>
136 # endif
137 
138 # ifdef OPENSSL_SYS_VMS
139 #  include <ssdef.h>
140 #  include <iodef.h>
141 #  include <ttdef.h>
142 #  include <descrip.h>
143 struct IOSB {
144     short iosb$w_value;
145     short iosb$w_count;
146     long iosb$l_info;
147 };
148 # endif
149 
150 # ifndef NX509_SIG
151 #  define NX509_SIG 32
152 # endif
153 
154 /* Define globals.  They are protected by a lock */
155 # ifdef SIGACTION
156 static struct sigaction savsig[NX509_SIG];
157 # else
158 static void (*savsig[NX509_SIG]) (int);
159 # endif
160 
161 # ifdef OPENSSL_SYS_VMS
162 static struct IOSB iosb;
163 static $DESCRIPTOR(terminal, "TT");
164 static long tty_orig[3], tty_new[3]; /* XXX Is there any guarantee that this
165                                       * will always suffice for the actual
166                                       * structures? */
167 static long status;
168 static unsigned short channel = 0;
169 # elif defined(_WIN32) && !defined(_WIN32_WCE)
170 static DWORD tty_orig, tty_new;
171 # else
172 #  if !defined(OPENSSL_SYS_MSDOS) || defined(__DJGPP__)
173 static TTY_STRUCT tty_orig, tty_new;
174 #  endif
175 # endif
176 static FILE *tty_in, *tty_out;
177 static int is_a_tty;
178 
179 /* Declare static functions */
180 # if !defined(OPENSSL_SYS_WINCE)
181 static int read_till_nl(FILE *);
182 static void recsig(int);
183 static void pushsig(void);
184 static void popsig(void);
185 # endif
186 # if defined(OPENSSL_SYS_MSDOS) && !defined(_WIN32)
187 static int noecho_fgets(char *buf, int size, FILE *tty);
188 # endif
189 static int read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl);
190 
191 static int read_string(UI *ui, UI_STRING *uis);
192 static int write_string(UI *ui, UI_STRING *uis);
193 
194 static int open_console(UI *ui);
195 static int echo_console(UI *ui);
196 static int noecho_console(UI *ui);
197 static int close_console(UI *ui);
198 
199 /*
200  * The following function makes sure that info and error strings are printed
201  * before any prompt.
202  */
write_string(UI * ui,UI_STRING * uis)203 static int write_string(UI *ui, UI_STRING *uis)
204 {
205     switch (UI_get_string_type(uis)) {
206     case UIT_ERROR:
207     case UIT_INFO:
208         fputs(UI_get0_output_string(uis), tty_out);
209         fflush(tty_out);
210         break;
211     case UIT_NONE:
212     case UIT_PROMPT:
213     case UIT_VERIFY:
214     case UIT_BOOLEAN:
215         break;
216     }
217     return 1;
218 }
219 
read_string(UI * ui,UI_STRING * uis)220 static int read_string(UI *ui, UI_STRING *uis)
221 {
222     int ok = 0;
223 
224     switch (UI_get_string_type(uis)) {
225     case UIT_BOOLEAN:
226         fputs(UI_get0_output_string(uis), tty_out);
227         fputs(UI_get0_action_string(uis), tty_out);
228         fflush(tty_out);
229         return read_string_inner(ui, uis,
230                                  UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO,
231                                  0);
232     case UIT_PROMPT:
233         fputs(UI_get0_output_string(uis), tty_out);
234         fflush(tty_out);
235         return read_string_inner(ui, uis,
236                                  UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO,
237                                  1);
238     case UIT_VERIFY:
239         fprintf(tty_out, "Verifying - %s", UI_get0_output_string(uis));
240         fflush(tty_out);
241         if ((ok = read_string_inner(ui, uis,
242                                     UI_get_input_flags(uis) &
243                                     UI_INPUT_FLAG_ECHO, 1)) <= 0)
244             return ok;
245         if (strcmp(UI_get0_result_string(uis), UI_get0_test_string(uis)) != 0) {
246             fprintf(tty_out, "Verify failure\n");
247             fflush(tty_out);
248             return 0;
249         }
250         break;
251     case UIT_NONE:
252     case UIT_INFO:
253     case UIT_ERROR:
254         break;
255     }
256     return 1;
257 }
258 
259 # if !defined(OPENSSL_SYS_WINCE)
260 /* Internal functions to read a string without echoing */
read_till_nl(FILE * in)261 static int read_till_nl(FILE *in)
262 {
263 #  define SIZE 4
264     char buf[SIZE + 1];
265 
266     do {
267         if (!fgets(buf, SIZE, in))
268             return 0;
269     } while (strchr(buf, '\n') == NULL);
270     return 1;
271 }
272 
273 static volatile sig_atomic_t intr_signal;
274 # endif
275 
read_string_inner(UI * ui,UI_STRING * uis,int echo,int strip_nl)276 static int read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl)
277 {
278     static int ps;
279     int ok;
280     char result[BUFSIZ];
281     int maxsize = BUFSIZ - 1;
282 # if !defined(OPENSSL_SYS_WINCE)
283     char *p = NULL;
284     int echo_eol = !echo;
285 
286     intr_signal = 0;
287     ok = 0;
288     ps = 0;
289 
290     pushsig();
291     ps = 1;
292 
293     if (!echo && !noecho_console(ui))
294         goto error;
295     ps = 2;
296 
297     result[0] = '\0';
298 #  if defined(_WIN32)
299     if (is_a_tty) {
300         DWORD numread;
301 #   if defined(CP_UTF8)
302         if (GetEnvironmentVariableW(L"OPENSSL_WIN32_UTF8", NULL, 0) != 0) {
303             WCHAR wresult[BUFSIZ];
304 
305             if (ReadConsoleW(GetStdHandle(STD_INPUT_HANDLE),
306                          wresult, maxsize, &numread, NULL)) {
307                 if (numread >= 2 &&
308                     wresult[numread-2] == L'\r' &&
309                     wresult[numread-1] == L'\n') {
310                     wresult[numread-2] = L'\n';
311                     numread--;
312                 }
313                 wresult[numread] = '\0';
314                 if (WideCharToMultiByte(CP_UTF8, 0, wresult, -1,
315                                         result, sizeof(result), NULL, 0) > 0)
316                     p = result;
317 
318                 OPENSSL_cleanse(wresult, sizeof(wresult));
319             }
320         } else
321 #   endif
322         if (ReadConsoleA(GetStdHandle(STD_INPUT_HANDLE),
323                          result, maxsize, &numread, NULL)) {
324             if (numread >= 2 &&
325                 result[numread-2] == '\r' && result[numread-1] == '\n') {
326                 result[numread-2] = '\n';
327                 numread--;
328             }
329             result[numread] = '\0';
330             p = result;
331         }
332     } else
333 #  elif defined(OPENSSL_SYS_MSDOS)
334     if (!echo) {
335         noecho_fgets(result, maxsize, tty_in);
336         p = result;             /* FIXME: noecho_fgets doesn't return errors */
337     } else
338 #  endif
339     p = fgets(result, maxsize, tty_in);
340     if (p == NULL)
341         goto error;
342     if (feof(tty_in))
343         goto error;
344     if (ferror(tty_in))
345         goto error;
346     if ((p = (char *)strchr(result, '\n')) != NULL) {
347         if (strip_nl)
348             *p = '\0';
349     } else if (!read_till_nl(tty_in))
350         goto error;
351     if (UI_set_result(ui, uis, result) >= 0)
352         ok = 1;
353 
354  error:
355     if (intr_signal == SIGINT)
356         ok = -1;
357     if (echo_eol)
358         fprintf(tty_out, "\n");
359     if (ps >= 2 && !echo && !echo_console(ui))
360         ok = 0;
361 
362     if (ps >= 1)
363         popsig();
364 # else
365     ok = 1;
366 # endif
367 
368     OPENSSL_cleanse(result, BUFSIZ);
369     return ok;
370 }
371 
372 /* Internal functions to open, handle and close a channel to the console.  */
open_console(UI * ui)373 static int open_console(UI *ui)
374 {
375     if (!CRYPTO_THREAD_write_lock(ui->lock))
376         return 0;
377     is_a_tty = 1;
378 
379 # if defined(OPENSSL_SYS_VXWORKS)
380     tty_in = stdin;
381     tty_out = stderr;
382 # elif defined(_WIN32) && !defined(_WIN32_WCE)
383     if ((tty_out = fopen("conout$", "w")) == NULL)
384         tty_out = stderr;
385 
386     if (GetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), &tty_orig)) {
387         tty_in = stdin;
388     } else {
389         is_a_tty = 0;
390         if ((tty_in = fopen("conin$", "r")) == NULL)
391             tty_in = stdin;
392     }
393 # else
394 #  ifdef OPENSSL_SYS_MSDOS
395 #   define DEV_TTY "con"
396 #  else
397 #   define DEV_TTY "/dev/tty"
398 #  endif
399     if ((tty_in = fopen(DEV_TTY, "r")) == NULL)
400         tty_in = stdin;
401     if ((tty_out = fopen(DEV_TTY, "w")) == NULL)
402         tty_out = stderr;
403 # endif
404 
405 # if defined(TTY_get) && !defined(OPENSSL_SYS_VMS)
406     if (TTY_get(fileno(tty_in), &tty_orig) == -1) {
407 #  ifdef ENOTTY
408         if (errno == ENOTTY)
409             is_a_tty = 0;
410         else
411 #  endif
412 #  ifdef EINVAL
413             /*
414              * Ariel Glenn reports that solaris can return EINVAL instead.
415              * This should be ok
416              */
417         if (errno == EINVAL)
418             is_a_tty = 0;
419         else
420 #  endif
421 #  ifdef ENXIO
422             /*
423              * Solaris can return ENXIO.
424              * This should be ok
425              */
426         if (errno == ENXIO)
427             is_a_tty = 0;
428         else
429 #  endif
430 #  ifdef EIO
431             /*
432              * Linux can return EIO.
433              * This should be ok
434              */
435         if (errno == EIO)
436             is_a_tty = 0;
437         else
438 #  endif
439 #  ifdef EPERM
440             /*
441              * Linux can return EPERM (Operation not permitted),
442              * e.g. if a daemon executes openssl via fork()+execve()
443              * This should be ok
444              */
445         if (errno == EPERM)
446             is_a_tty = 0;
447         else
448 #  endif
449 #  ifdef ENODEV
450             /*
451              * MacOS X returns ENODEV (Operation not supported by device),
452              * which seems appropriate.
453              */
454         if (errno == ENODEV)
455                 is_a_tty = 0;
456         else
457 #  endif
458             {
459                 ERR_raise_data(ERR_LIB_UI, UI_R_UNKNOWN_TTYGET_ERRNO_VALUE,
460                                "errno=%d", errno);
461                 return 0;
462             }
463     }
464 # endif
465 # ifdef OPENSSL_SYS_VMS
466     status = sys$assign(&terminal, &channel, 0, 0);
467 
468     /* if there isn't a TT device, something is very wrong */
469     if (status != SS$_NORMAL) {
470         ERR_raise_data(ERR_LIB_UI, UI_R_SYSASSIGN_ERROR,
471                        "status=%%X%08X", status);
472         return 0;
473     }
474 
475     status = sys$qiow(0, channel, IO$_SENSEMODE, &iosb, 0, 0, tty_orig, 12,
476                       0, 0, 0, 0);
477 
478     /* If IO$_SENSEMODE doesn't work, this is not a terminal device */
479     if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
480         is_a_tty = 0;
481 # endif
482     return 1;
483 }
484 
noecho_console(UI * ui)485 static int noecho_console(UI *ui)
486 {
487 # ifdef TTY_FLAGS
488     memcpy(&(tty_new), &(tty_orig), sizeof(tty_orig));
489     tty_new.TTY_FLAGS &= ~ECHO;
490 # endif
491 
492 # if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
493     if (is_a_tty && (TTY_set(fileno(tty_in), &tty_new) == -1))
494         return 0;
495 # endif
496 # ifdef OPENSSL_SYS_VMS
497     if (is_a_tty) {
498         tty_new[0] = tty_orig[0];
499         tty_new[1] = tty_orig[1] | TT$M_NOECHO;
500         tty_new[2] = tty_orig[2];
501         status = sys$qiow(0, channel, IO$_SETMODE, &iosb, 0, 0, tty_new, 12,
502                           0, 0, 0, 0);
503         if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL)) {
504             ERR_raise_data(ERR_LIB_UI, UI_R_SYSQIOW_ERROR,
505                            "status=%%X%08X, iosb.iosb$w_value=%%X%08X",
506                            status, iosb.iosb$w_value);
507             return 0;
508         }
509     }
510 # endif
511 # if defined(_WIN32) && !defined(_WIN32_WCE)
512     if (is_a_tty) {
513         tty_new = tty_orig;
514         tty_new &= ~ENABLE_ECHO_INPUT;
515         SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), tty_new);
516     }
517 # endif
518     return 1;
519 }
520 
echo_console(UI * ui)521 static int echo_console(UI *ui)
522 {
523 # if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
524     memcpy(&(tty_new), &(tty_orig), sizeof(tty_orig));
525     if (is_a_tty && (TTY_set(fileno(tty_in), &tty_new) == -1))
526         return 0;
527 # endif
528 # ifdef OPENSSL_SYS_VMS
529     if (is_a_tty) {
530         tty_new[0] = tty_orig[0];
531         tty_new[1] = tty_orig[1];
532         tty_new[2] = tty_orig[2];
533         status = sys$qiow(0, channel, IO$_SETMODE, &iosb, 0, 0, tty_new, 12,
534                           0, 0, 0, 0);
535         if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL)) {
536             ERR_raise_data(ERR_LIB_UI, UI_R_SYSQIOW_ERROR,
537                            "status=%%X%08X, iosb.iosb$w_value=%%X%08X",
538                            status, iosb.iosb$w_value);
539             return 0;
540         }
541     }
542 # endif
543 # if defined(_WIN32) && !defined(_WIN32_WCE)
544     if (is_a_tty) {
545         tty_new = tty_orig;
546         SetConsoleMode(GetStdHandle(STD_INPUT_HANDLE), tty_new);
547     }
548 # endif
549     return 1;
550 }
551 
close_console(UI * ui)552 static int close_console(UI *ui)
553 {
554     int ret = 1;
555 
556     if (tty_in != stdin)
557         fclose(tty_in);
558     if (tty_out != stderr)
559         fclose(tty_out);
560 # ifdef OPENSSL_SYS_VMS
561     status = sys$dassgn(channel);
562     if (status != SS$_NORMAL) {
563         ERR_raise_data(ERR_LIB_UI, UI_R_SYSDASSGN_ERROR,
564                        "status=%%X%08X", status);
565         ret = 0;
566     }
567 # endif
568     CRYPTO_THREAD_unlock(ui->lock);
569 
570     return ret;
571 }
572 
573 # if !defined(OPENSSL_SYS_WINCE)
574 /* Internal functions to handle signals and act on them */
pushsig(void)575 static void pushsig(void)
576 {
577 #  ifndef OPENSSL_SYS_WIN32
578     int i;
579 #  endif
580 #  ifdef SIGACTION
581     struct sigaction sa;
582 
583     memset(&sa, 0, sizeof(sa));
584     sa.sa_handler = recsig;
585 #  endif
586 
587 #  ifdef OPENSSL_SYS_WIN32
588     savsig[SIGABRT] = signal(SIGABRT, recsig);
589     savsig[SIGFPE] = signal(SIGFPE, recsig);
590     savsig[SIGILL] = signal(SIGILL, recsig);
591     savsig[SIGINT] = signal(SIGINT, recsig);
592     savsig[SIGSEGV] = signal(SIGSEGV, recsig);
593     savsig[SIGTERM] = signal(SIGTERM, recsig);
594 #  else
595     for (i = 1; i < NX509_SIG; i++) {
596 #   ifdef SIGUSR1
597         if (i == SIGUSR1)
598             continue;
599 #   endif
600 #   ifdef SIGUSR2
601         if (i == SIGUSR2)
602             continue;
603 #   endif
604 #   ifdef SIGKILL
605         if (i == SIGKILL)       /* We can't make any action on that. */
606             continue;
607 #   endif
608 #   ifdef SIGACTION
609         sigaction(i, &sa, &savsig[i]);
610 #   else
611         savsig[i] = signal(i, recsig);
612 #   endif
613     }
614 #  endif
615 
616 #  ifdef SIGWINCH
617     signal(SIGWINCH, SIG_DFL);
618 #  endif
619 }
620 
popsig(void)621 static void popsig(void)
622 {
623 #  ifdef OPENSSL_SYS_WIN32
624     signal(SIGABRT, savsig[SIGABRT]);
625     signal(SIGFPE, savsig[SIGFPE]);
626     signal(SIGILL, savsig[SIGILL]);
627     signal(SIGINT, savsig[SIGINT]);
628     signal(SIGSEGV, savsig[SIGSEGV]);
629     signal(SIGTERM, savsig[SIGTERM]);
630 #  else
631     int i;
632     for (i = 1; i < NX509_SIG; i++) {
633 #   ifdef SIGUSR1
634         if (i == SIGUSR1)
635             continue;
636 #   endif
637 #   ifdef SIGUSR2
638         if (i == SIGUSR2)
639             continue;
640 #   endif
641 #   ifdef SIGACTION
642         sigaction(i, &savsig[i], NULL);
643 #   else
644         signal(i, savsig[i]);
645 #   endif
646     }
647 #  endif
648 }
649 
recsig(int i)650 static void recsig(int i)
651 {
652     intr_signal = i;
653 }
654 # endif
655 
656 /* Internal functions specific for Windows */
657 # if defined(OPENSSL_SYS_MSDOS) && !defined(_WIN32)
noecho_fgets(char * buf,int size,FILE * tty)658 static int noecho_fgets(char *buf, int size, FILE *tty)
659 {
660     int i;
661     char *p;
662 
663     p = buf;
664     for (;;) {
665         if (size == 0) {
666             *p = '\0';
667             break;
668         }
669         size--;
670 #  if defined(_WIN32)
671         i = _getch();
672 #  else
673         i = getch();
674 #  endif
675         if (i == '\r')
676             i = '\n';
677         *(p++) = i;
678         if (i == '\n') {
679             *p = '\0';
680             break;
681         }
682     }
683 #  ifdef WIN_CONSOLE_BUG
684     /*
685      * Win95 has several evil console bugs: one of these is that the last
686      * character read using getch() is passed to the next read: this is
687      * usually a CR so this can be trouble. No STDIO fix seems to work but
688      * flushing the console appears to do the trick.
689      */
690     {
691         HANDLE inh;
692         inh = GetStdHandle(STD_INPUT_HANDLE);
693         FlushConsoleInputBuffer(inh);
694     }
695 #  endif
696     return strlen(buf);
697 }
698 # endif
699 
700 static UI_METHOD ui_openssl = {
701     "OpenSSL default user interface",
702     open_console,
703     write_string,
704     NULL,                       /* No flusher is needed for command lines */
705     read_string,
706     close_console,
707     NULL
708 };
709 
710 /* The method with all the built-in console thingies */
UI_OpenSSL(void)711 UI_METHOD *UI_OpenSSL(void)
712 {
713     return &ui_openssl;
714 }
715 
716 static const UI_METHOD *default_UI_meth = &ui_openssl;
717 
718 #else
719 
720 static const UI_METHOD *default_UI_meth = NULL;
721 
722 #endif
723 
UI_set_default_method(const UI_METHOD * meth)724 void UI_set_default_method(const UI_METHOD *meth)
725 {
726     default_UI_meth = meth;
727 }
728 
UI_get_default_method(void)729 const UI_METHOD *UI_get_default_method(void)
730 {
731     return default_UI_meth;
732 }
733