crypto/ui/ui_openssl.c - third_party/openssl - Git at Google

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

 /* The lowest level part of this file was previously in crypto/des/read_pwd.c,
  * Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
  * This package is an SSL implementation written
  * by Eric Young (eay@cryptsoft.com).
  * The implementation was written so as to conform with Netscapes SSL.
  *
  * This library is free for commercial and non-commercial use as long as
  * the following conditions are aheared to.  The following conditions
  * apply to all code found in this distribution, be it the RC4, RSA,
  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  * included with this distribution is covered by the same copyright terms
  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  *
  * Copyright remains Eric Young's, and as such any Copyright notices in
  * the code are not to be removed.
  * If this package is used in a product, Eric Young should be given attribution
  * as the author of the parts of the library used.
  * This can be in the form of a textual message at program startup or
  * in documentation (online or textual) provided with the package.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  * 3. All advertising materials mentioning features or use of this software
  *    must display the following acknowledgement:
  *    "This product includes cryptographic software written by
  *     Eric Young (eay@cryptsoft.com)"
  *    The word 'cryptographic' can be left out if the rouines from the library
  *    being used are not cryptographic related :-).
  * 4. If you include any Windows specific code (or a derivative thereof) from
  *    the apps directory (application code) you must include an acknowledgement:
  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  *
  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
  * The licence and distribution terms for any publically available version or
  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  * copied and put under another distribution licence
  * [including the GNU Public Licence.]
  */


 #include <openssl/e_os2.h>

 /* need for #define _POSIX_C_SOURCE arises whenever you pass -ansi to gcc
  * [maybe others?], because it masks interfaces not discussed in standard,
  * sigaction and fileno included. -pedantic would be more appropriate for
  * the intended purposes, but we can't prevent users from adding -ansi.
  */
 #define _POSIX_C_SOURCE 1
 #include <signal.h>
 #include <stdio.h>
 #include <string.h>
 #include <errno.h>

 #if !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS)
 # ifdef OPENSSL_UNISTD
 #  include OPENSSL_UNISTD
 # else
 #  include <unistd.h>
 # endif
 /* If unistd.h defines _POSIX_VERSION, we conclude that we
  * are on a POSIX system and have sigaction and termios. */
 # if defined(_POSIX_VERSION)

 #  define SIGACTION
 #  if !defined(TERMIOS) && !defined(TERMIO) && !defined(SGTTY)
 #   define TERMIOS
 #  endif

 # endif
 #endif

 #ifdef WIN16TTY
 # undef OPENSSL_SYS_WIN16
 # undef WIN16
 # undef _WINDOWS
 # include <graph.h>
 #endif

 /* 06-Apr-92 Luke Brennan    Support for VMS */
 #include "ui_locl.h"
 #include "cryptlib.h"

 #ifdef OPENSSL_SYS_VMS		/* prototypes for sys$whatever */
 # include <starlet.h>
 # ifdef __DECC
 #  pragma message disable DOLLARID
 # endif
 #endif

 #ifdef WIN_CONSOLE_BUG
 # include <windows.h>
 #ifndef OPENSSL_SYS_WINCE
 # include <wincon.h>
 #endif
 #endif


 /* There are 5 types of terminal interface supported,
  * TERMIO, TERMIOS, VMS, MSDOS and SGTTY
  */

 #if defined(__sgi) && !defined(TERMIOS)
 # define TERMIOS
 # undef  TERMIO
 # undef  SGTTY
 #endif

 #if defined(linux) && !defined(TERMIO)
 # undef  TERMIOS
 # define TERMIO
 # undef  SGTTY
 #endif

 #ifdef _LIBC
 # undef  TERMIOS
 # define TERMIO
 # undef  SGTTY
 #endif

 #if !defined(TERMIO) && !defined(TERMIOS) && !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_MACINTOSH_CLASSIC) && !defined(MAC_OS_GUSI_SOURCE)
 # undef  TERMIOS
 # undef  TERMIO
 # define SGTTY
 #endif

 #if defined(OPENSSL_SYS_VXWORKS)
 #undef TERMIOS
 #undef TERMIO
 #undef SGTTY
 #endif

 #if defined(OPENSSL_SYS_NETWARE)
 #undef TERMIOS
 #undef TERMIO
 #undef SGTTY
 #endif

 #ifdef TERMIOS
 # include <termios.h>
 # define TTY_STRUCT		struct termios
 # define TTY_FLAGS		c_lflag
 # define TTY_get(tty,data)	tcgetattr(tty,data)
 # define TTY_set(tty,data)	tcsetattr(tty,TCSANOW,data)
 #endif

 #ifdef TERMIO
 # include <termio.h>
 # define TTY_STRUCT		struct termio
 # define TTY_FLAGS		c_lflag
 # define TTY_get(tty,data)	ioctl(tty,TCGETA,data)
 # define TTY_set(tty,data)	ioctl(tty,TCSETA,data)
 #endif

 #ifdef SGTTY
 # include <sgtty.h>
 # define TTY_STRUCT		struct sgttyb
 # define TTY_FLAGS		sg_flags
 # define TTY_get(tty,data)	ioctl(tty,TIOCGETP,data)
 # define TTY_set(tty,data)	ioctl(tty,TIOCSETP,data)
 #endif

 #if !defined(_LIBC) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_MACINTOSH_CLASSIC) && !defined(OPENSSL_SYS_SUNOS)
 # include <sys/ioctl.h>
 #endif

 #ifdef OPENSSL_SYS_MSDOS
 # include <conio.h>
 #endif

 #ifdef OPENSSL_SYS_VMS
 # include <ssdef.h>
 # include <iodef.h>
 # include <ttdef.h>
 # include <descrip.h>
 struct IOSB {
 	short iosb$w_value;
 	short iosb$w_count;
 	long  iosb$l_info;
 	};
 #endif

 #ifdef OPENSSL_SYS_SUNOS
 	typedef int sig_atomic_t;
 #endif

 #if defined(OPENSSL_SYS_MACINTOSH_CLASSIC) || defined(MAC_OS_GUSI_SOURCE) || defined(OPENSSL_SYS_NETWARE)
 /*
  * This one needs work. As a matter of fact the code is unoperational
  * and this is only a trick to get it compiled.
  *					<appro@fy.chalmers.se>
  */
 # define TTY_STRUCT int
 #endif

 #ifndef NX509_SIG
 # define NX509_SIG 32
 #endif


 /* Define globals.  They are protected by a lock */
 #ifdef SIGACTION
 static struct sigaction savsig[NX509_SIG];
 #else
 static void (*savsig[NX509_SIG])(int );
 #endif

 #ifdef OPENSSL_SYS_VMS
 static struct IOSB iosb;
 static $DESCRIPTOR(terminal,"TT");
 static long tty_orig[3], tty_new[3]; /* XXX   Is there any guarantee that this will always suffice for the actual structures? */
 static long status;
 static unsigned short channel = 0;
 #else
 #if !defined(OPENSSL_SYS_MSDOS) || defined(__DJGPP__)
 static TTY_STRUCT tty_orig,tty_new;
 #endif
 #endif
 static FILE *tty_in, *tty_out;
 static int is_a_tty;

 /* Declare static functions */
 #if !defined(OPENSSL_SYS_WIN16) && !defined(OPENSSL_SYS_WINCE)
 static void read_till_nl(FILE *);
 static void recsig(int);
 static void pushsig(void);
 static void popsig(void);
 #endif
 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN16)
 static int noecho_fgets(char *buf, int size, FILE *tty);
 #endif
 static int read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl);

 static int read_string(UI *ui, UI_STRING *uis);
 static int write_string(UI *ui, UI_STRING *uis);

 static int open_console(UI *ui);
 static int echo_console(UI *ui);
 static int noecho_console(UI *ui);
 static int close_console(UI *ui);

 static UI_METHOD ui_openssl =
 	{
 	"OpenSSL default user interface",
 	open_console,
 	write_string,
 	NULL,			/* No flusher is needed for command lines */
 	read_string,
 	close_console,
 	NULL
 	};

 /* The method with all the built-in thingies */
 UI_METHOD *UI_OpenSSL(void)
 	{
 	return &ui_openssl;
 	}

 /* The following function makes sure that info and error strings are printed
    before any prompt. */
 static int write_string(UI *ui, UI_STRING *uis)
 	{
 	switch (UI_get_string_type(uis))
 		{
 	case UIT_ERROR:
 	case UIT_INFO:
 		fputs(UI_get0_output_string(uis), tty_out);
 		fflush(tty_out);
 		break;
 	default:
 		break;
 		}
 	return 1;
 	}

 static int read_string(UI *ui, UI_STRING *uis)
 	{
 	int ok = 0;

 	switch (UI_get_string_type(uis))
 		{
 	case UIT_BOOLEAN:
 		fputs(UI_get0_output_string(uis), tty_out);
 		fputs(UI_get0_action_string(uis), tty_out);
 		fflush(tty_out);
 		return read_string_inner(ui, uis,
 			UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 0);
 	case UIT_PROMPT:
 		fputs(UI_get0_output_string(uis), tty_out);
 		fflush(tty_out);
 		return read_string_inner(ui, uis,
 			UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 1);
 	case UIT_VERIFY:
 		fprintf(tty_out,"Verifying - %s",
 			UI_get0_output_string(uis));
 		fflush(tty_out);
 		if ((ok = read_string_inner(ui, uis,
 			UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 1)) <= 0)
 			return ok;
 		if (strcmp(UI_get0_result_string(uis),
 			UI_get0_test_string(uis)) != 0)
 			{
 			fprintf(tty_out,"Verify failure\n");
 			fflush(tty_out);
 			return 0;
 			}
 		break;
 	default:
 		break;
 		}
 	return 1;
 	}


 #if !defined(OPENSSL_SYS_WIN16) && !defined(OPENSSL_SYS_WINCE)
 /* Internal functions to read a string without echoing */
 static void read_till_nl(FILE *in)
 	{
 #define SIZE 4
 	char buf[SIZE+1];

 	do	{
 		fgets(buf,SIZE,in);
 		} while (strchr(buf,'\n') == NULL);
 	}

 static volatile sig_atomic_t intr_signal;
 #endif

 static int read_string_inner(UI *ui, UI_STRING *uis, int echo, int strip_nl)
 	{
 	static int ps;
 	int ok;
 	char result[BUFSIZ];
 	int maxsize = BUFSIZ-1;
 #if !defined(OPENSSL_SYS_WIN16) && !defined(OPENSSL_SYS_WINCE)
 	char *p;

 	intr_signal=0;
 	ok=0;
 	ps=0;

 	pushsig();
 	ps=1;

 	if (!echo && !noecho_console(ui))
 		goto error;
 	ps=2;

 	result[0]='\0';
 #ifdef OPENSSL_SYS_MSDOS
 	if (!echo)
 		{
 		noecho_fgets(result,maxsize,tty_in);
 		p=result; /* FIXME: noecho_fgets doesn't return errors */
 		}
 	else
 		p=fgets(result,maxsize,tty_in);
 #else
 	p=fgets(result,maxsize,tty_in);
 #endif
 	if(!p)
 		goto error;
 	if (feof(tty_in)) goto error;
 	if (ferror(tty_in)) goto error;
 	if ((p=(char *)strchr(result,'\n')) != NULL)
 		{
 		if (strip_nl)
 			*p='\0';
 		}
 	else
 		read_till_nl(tty_in);
 	if (UI_set_result(ui, uis, result) >= 0)
 		ok=1;

 error:
 	if (intr_signal == SIGINT)
 		ok=-1;
 	if (!echo) fprintf(tty_out,"\n");
 	if (ps >= 2 && !echo && !echo_console(ui))
 		ok=0;

 	if (ps >= 1)
 		popsig();
 #else
 	ok=1;
 #endif

 	OPENSSL_cleanse(result,BUFSIZ);
 	return ok;
 	}


 /* Internal functions to open, handle and close a channel to the console.  */
 static int open_console(UI *ui)
 	{
 	CRYPTO_w_lock(CRYPTO_LOCK_UI);
 	is_a_tty = 1;

 #if defined(OPENSSL_SYS_MACINTOSH_CLASSIC) || defined(OPENSSL_SYS_VXWORKS) || defined(OPENSSL_SYS_NETWARE)
 	tty_in=stdin;
 	tty_out=stderr;
 #else
 #  ifdef OPENSSL_SYS_MSDOS
 #    define DEV_TTY "con"
 #  else
 #    define DEV_TTY "/dev/tty"
 #  endif
 	if ((tty_in=fopen(DEV_TTY,"r")) == NULL)
 		tty_in=stdin;
 	if ((tty_out=fopen(DEV_TTY,"w")) == NULL)
 		tty_out=stderr;
 #endif

 #if defined(TTY_get) && !defined(OPENSSL_SYS_VMS)
  	if (TTY_get(fileno(tty_in),&tty_orig) == -1)
 		{
 #ifdef ENOTTY
 		if (errno == ENOTTY)
 			is_a_tty=0;
 		else
 #endif
 #ifdef EINVAL
 		/* Ariel Glenn ariel@columbia.edu reports that solaris
 		 * can return EINVAL instead.  This should be ok */
 		if (errno == EINVAL)
 			is_a_tty=0;
 		else
 #endif
 			return 0;
 		}
 #endif
 #ifdef OPENSSL_SYS_VMS
 	status = sys$assign(&terminal,&channel,0,0);
 	if (status != SS$_NORMAL)
 		return 0;
 	status=sys$qiow(0,channel,IO$_SENSEMODE,&iosb,0,0,tty_orig,12,0,0,0,0);
 	if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
 		return 0;
 #endif
 	return 1;
 	}

 static int noecho_console(UI *ui)
 	{
 #ifdef TTY_FLAGS
 	memcpy(&(tty_new),&(tty_orig),sizeof(tty_orig));
 	tty_new.TTY_FLAGS &= ~ECHO;
 #endif

 #if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
 	if (is_a_tty && (TTY_set(fileno(tty_in),&tty_new) == -1))
 		return 0;
 #endif
 #ifdef OPENSSL_SYS_VMS
 	tty_new[0] = tty_orig[0];
 	tty_new[1] = tty_orig[1] | TT$M_NOECHO;
 	tty_new[2] = tty_orig[2];
 	status = sys$qiow(0,channel,IO$_SETMODE,&iosb,0,0,tty_new,12,0,0,0,0);
 	if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
 		return 0;
 #endif
 	return 1;
 	}

 static int echo_console(UI *ui)
 	{
 #if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
 	memcpy(&(tty_new),&(tty_orig),sizeof(tty_orig));
 	tty_new.TTY_FLAGS |= ECHO;
 #endif

 #if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
 	if (is_a_tty && (TTY_set(fileno(tty_in),&tty_new) == -1))
 		return 0;
 #endif
 #ifdef OPENSSL_SYS_VMS
 	tty_new[0] = tty_orig[0];
 	tty_new[1] = tty_orig[1] & ~TT$M_NOECHO;
 	tty_new[2] = tty_orig[2];
 	status = sys$qiow(0,channel,IO$_SETMODE,&iosb,0,0,tty_new,12,0,0,0,0);
 	if ((status != SS$_NORMAL) || (iosb.iosb$w_value != SS$_NORMAL))
 		return 0;
 #endif
 	return 1;
 	}

 static int close_console(UI *ui)
 	{
 	if (tty_in != stdin) fclose(tty_in);
 	if (tty_out != stderr) fclose(tty_out);
 #ifdef OPENSSL_SYS_VMS
 	status = sys$dassgn(channel);
 #endif
 	CRYPTO_w_unlock(CRYPTO_LOCK_UI);

 	return 1;
 	}


 #if !defined(OPENSSL_SYS_WIN16) && !defined(OPENSSL_SYS_WINCE)
 /* Internal functions to handle signals and act on them */
 static void pushsig(void)
 	{
 	int i;
 #ifdef SIGACTION
 	struct sigaction sa;

 	memset(&sa,0,sizeof sa);
 	sa.sa_handler=recsig;
 #endif

 	for (i=1; i<NX509_SIG; i++)
 		{
 #ifdef SIGUSR1
 		if (i == SIGUSR1)
 			continue;
 #endif
 #ifdef SIGUSR2
 		if (i == SIGUSR2)
 			continue;
 #endif
 #ifdef SIGKILL
 		if (i == SIGKILL) /* We can't make any action on that. */
 			continue;
 #endif
 #ifdef SIGACTION
 		sigaction(i,&sa,&savsig[i]);
 #else
 		savsig[i]=signal(i,recsig);
 #endif
 		}

 #ifdef SIGWINCH
 	signal(SIGWINCH,SIG_DFL);
 #endif
 	}

 static void popsig(void)
 	{
 	int i;

 	for (i=1; i<NX509_SIG; i++)
 		{
 #ifdef SIGUSR1
 		if (i == SIGUSR1)
 			continue;
 #endif
 #ifdef SIGUSR2
 		if (i == SIGUSR2)
 			continue;
 #endif
 #ifdef SIGACTION
 		sigaction(i,&savsig[i],NULL);
 #else
 		signal(i,savsig[i]);
 #endif
 		}
 	}

 static void recsig(int i)
 	{
 	intr_signal=i;
 	}
 #endif

 /* Internal functions specific for Windows */
 #if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN16) && !defined(OPENSSL_SYS_WINCE)
 static int noecho_fgets(char *buf, int size, FILE *tty)
 	{
 	int i;
 	char *p;

 	p=buf;
 	for (;;)
 		{
 		if (size == 0)
 			{
 			*p='\0';
 			break;
 			}
 		size--;
 #ifdef WIN16TTY
 		i=_inchar();
 #else
 		i=getch();
 #endif
 		if (i == '\r') i='\n';
 		*(p++)=i;
 		if (i == '\n')
 			{
 			*p='\0';
 			break;
 			}
 		}
 #ifdef WIN_CONSOLE_BUG
 /* Win95 has several evil console bugs: one of these is that the
  * last character read using getch() is passed to the next read: this is
  * usually a CR so this can be trouble. No STDIO fix seems to work but
  * flushing the console appears to do the trick.
  */
 		{
 			HANDLE inh;
 			inh = GetStdHandle(STD_INPUT_HANDLE);
 			FlushConsoleInputBuffer(inh);
 		}
 #endif
 	return(strlen(buf));
 	}
 #endif
	/* crypto/ui/ui_openssl.c -- mode:C; c-file-style: "eay" -- */
	/* Written by Richard Levitte (richard@levitte.org) and others
	* for the OpenSSL project 2001.
	*/
	/* ====================================================================
	* Copyright (c) 2001 The OpenSSL Project. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	*
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in
	* the documentation and/or other materials provided with the
	* distribution.
	*
	* 3. All advertising materials mentioning features or use of this
	* software must display the following acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
	*
	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For written permission, please contact
	* openssl-core@openssl.org.
	*
	* 5. Products derived from this software may not be called "OpenSSL"
	* nor may "OpenSSL" appear in their names without prior written
	* permission of the OpenSSL Project.
	*
	* 6. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
	*
	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
	* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
	* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
	* OF THE POSSIBILITY OF SUCH DAMAGE.
	* ====================================================================
	*
	* This product includes cryptographic software written by Eric Young
	* (eay@cryptsoft.com). This product includes software written by Tim
	* Hudson (tjh@cryptsoft.com).
	*
	*/

	/* The lowest level part of this file was previously in crypto/des/read_pwd.c,
	* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
	* All rights reserved.
	*
	* This package is an SSL implementation written
	* by Eric Young (eay@cryptsoft.com).
	* The implementation was written so as to conform with Netscapes SSL.
	*
	* This library is free for commercial and non-commercial use as long as
	* the following conditions are aheared to. The following conditions
	* apply to all code found in this distribution, be it the RC4, RSA,
	* lhash, DES, etc., code; not just the SSL code. The SSL documentation
	* included with this distribution is covered by the same copyright terms
	* except that the holder is Tim Hudson (tjh@cryptsoft.com).
	*
	* Copyright remains Eric Young's, and as such any Copyright notices in
	* the code are not to be removed.
	* If this package is used in a product, Eric Young should be given attribution
	* as the author of the parts of the library used.
	* This can be in the form of a textual message at program startup or
	* in documentation (online or textual) provided with the package.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	* 1. Redistributions of source code must retain the copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. All advertising materials mentioning features or use of this software
	* must display the following acknowledgement:
	* "This product includes cryptographic software written by
	* Eric Young (eay@cryptsoft.com)"
	* The word 'cryptographic' can be left out if the rouines from the library
	* being used are not cryptographic related :-).
	* 4. If you include any Windows specific code (or a derivative thereof) from
	* the apps directory (application code) you must include an acknowledgement:
	* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
	*
	* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	* SUCH DAMAGE.
	*
	* The licence and distribution terms for any publically available version or
	* derivative of this code cannot be changed. i.e. this code cannot simply be
	* copied and put under another distribution licence
	* [including the GNU Public Licence.]
	*/


	#include <openssl/e_os2.h>

	/* need for #define _POSIX_C_SOURCE arises whenever you pass -ansi to gcc
	* [maybe others?], because it masks interfaces not discussed in standard,
	* sigaction and fileno included. -pedantic would be more appropriate for
	* the intended purposes, but we can't prevent users from adding -ansi.
	*/
	#define _POSIX_C_SOURCE 1
	#include <signal.h>
	#include <stdio.h>
	#include <string.h>
	#include <errno.h>

	#if !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS)
	# ifdef OPENSSL_UNISTD
	# include OPENSSL_UNISTD
	# else
	# include <unistd.h>
	# endif
	/* If unistd.h defines _POSIX_VERSION, we conclude that we
	* are on a POSIX system and have sigaction and termios. */
	# if defined(_POSIX_VERSION)

	# define SIGACTION
	# if !defined(TERMIOS) && !defined(TERMIO) && !defined(SGTTY)
	# define TERMIOS
	# endif

	# endif
	#endif

	#ifdef WIN16TTY
	# undef OPENSSL_SYS_WIN16
	# undef WIN16
	# undef _WINDOWS
	# include <graph.h>
	#endif

	/* 06-Apr-92 Luke Brennan Support for VMS */
	#include "ui_locl.h"
	#include "cryptlib.h"

	#ifdef OPENSSL_SYS_VMS /* prototypes for sys$whatever */
	# include <starlet.h>
	# ifdef __DECC
	# pragma message disable DOLLARID
	# endif
	#endif

	#ifdef WIN_CONSOLE_BUG
	# include <windows.h>
	#ifndef OPENSSL_SYS_WINCE
	# include <wincon.h>
	#endif
	#endif


	/* There are 5 types of terminal interface supported,
	* TERMIO, TERMIOS, VMS, MSDOS and SGTTY
	*/

	#if defined(__sgi) && !defined(TERMIOS)
	# define TERMIOS
	# undef TERMIO
	# undef SGTTY
	#endif

	#if defined(linux) && !defined(TERMIO)
	# undef TERMIOS
	# define TERMIO
	# undef SGTTY
	#endif

	#ifdef _LIBC
	# undef TERMIOS
	# define TERMIO
	# undef SGTTY
	#endif

	#if !defined(TERMIO) && !defined(TERMIOS) && !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_MACINTOSH_CLASSIC) && !defined(MAC_OS_GUSI_SOURCE)
	# undef TERMIOS
	# undef TERMIO
	# define SGTTY
	#endif

	#if defined(OPENSSL_SYS_VXWORKS)
	#undef TERMIOS
	#undef TERMIO
	#undef SGTTY
	#endif

	#if defined(OPENSSL_SYS_NETWARE)
	#undef TERMIOS
	#undef TERMIO
	#undef SGTTY
	#endif

	#ifdef TERMIOS
	# include <termios.h>
	# define TTY_STRUCT struct termios
	# define TTY_FLAGS c_lflag
	# define TTY_get(tty,data) tcgetattr(tty,data)
	# define TTY_set(tty,data) tcsetattr(tty,TCSANOW,data)
	#endif

	#ifdef TERMIO
	# include <termio.h>
	# define TTY_STRUCT struct termio
	# define TTY_FLAGS c_lflag
	# define TTY_get(tty,data) ioctl(tty,TCGETA,data)
	# define TTY_set(tty,data) ioctl(tty,TCSETA,data)
	#endif

	#ifdef SGTTY
	# include <sgtty.h>
	# define TTY_STRUCT struct sgttyb
	# define TTY_FLAGS sg_flags
	# define TTY_get(tty,data) ioctl(tty,TIOCGETP,data)
	# define TTY_set(tty,data) ioctl(tty,TIOCSETP,data)
	#endif

	#if !defined(_LIBC) && !defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_VMS) && !defined(OPENSSL_SYS_MACINTOSH_CLASSIC) && !defined(OPENSSL_SYS_SUNOS)
	# include <sys/ioctl.h>
	#endif

	#ifdef OPENSSL_SYS_MSDOS
	# include <conio.h>
	#endif

	#ifdef OPENSSL_SYS_VMS
	# include <ssdef.h>
	# include <iodef.h>
	# include <ttdef.h>
	# include <descrip.h>
	struct IOSB {
	short iosb$w_value;
	short iosb$w_count;
	long iosb$l_info;
	};
	#endif

	#ifdef OPENSSL_SYS_SUNOS
	typedef int sig_atomic_t;
	#endif

	#if defined(OPENSSL_SYS_MACINTOSH_CLASSIC) \|\| defined(MAC_OS_GUSI_SOURCE) \|\| defined(OPENSSL_SYS_NETWARE)
	/*
	* This one needs work. As a matter of fact the code is unoperational
	* and this is only a trick to get it compiled.
	* <appro@fy.chalmers.se>
	*/
	# define TTY_STRUCT int
	#endif

	#ifndef NX509_SIG
	# define NX509_SIG 32
	#endif


	/* Define globals. They are protected by a lock */
	#ifdef SIGACTION
	static struct sigaction savsig[NX509_SIG];
	#else
	static void (*savsig[NX509_SIG])(int );
	#endif

	#ifdef OPENSSL_SYS_VMS
	static struct IOSB iosb;
	static $DESCRIPTOR(terminal,"TT");
	static long tty_orig[3], tty_new[3]; /* XXX Is there any guarantee that this will always suffice for the actual structures? */
	static long status;
	static unsigned short channel = 0;
	#else
	#if !defined(OPENSSL_SYS_MSDOS) \|\| defined(__DJGPP__)
	static TTY_STRUCT tty_orig,tty_new;
	#endif
	#endif
	static FILE tty_in, tty_out;
	static int is_a_tty;

	/* Declare static functions */
	#if !defined(OPENSSL_SYS_WIN16) && !defined(OPENSSL_SYS_WINCE)
	static void read_till_nl(FILE *);
	static void recsig(int);
	static void pushsig(void);
	static void popsig(void);
	#endif
	#if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN16)
	static int noecho_fgets(char buf, int size, FILE tty);
	#endif
	static int read_string_inner(UI ui, UI_STRING uis, int echo, int strip_nl);

	static int read_string(UI ui, UI_STRING uis);
	static int write_string(UI ui, UI_STRING uis);

	static int open_console(UI *ui);
	static int echo_console(UI *ui);
	static int noecho_console(UI *ui);
	static int close_console(UI *ui);

	static UI_METHOD ui_openssl =
	{
	"OpenSSL default user interface",
	open_console,
	write_string,
	NULL, /* No flusher is needed for command lines */
	read_string,
	close_console,
	NULL
	};

	/* The method with all the built-in thingies */
	UI_METHOD *UI_OpenSSL(void)
	{
	return &ui_openssl;
	}

	/* The following function makes sure that info and error strings are printed
	before any prompt. */
	static int write_string(UI ui, UI_STRING uis)
	{
	switch (UI_get_string_type(uis))
	{
	case UIT_ERROR:
	case UIT_INFO:
	fputs(UI_get0_output_string(uis), tty_out);
	fflush(tty_out);
	break;
	default:
	break;
	}
	return 1;
	}

	static int read_string(UI ui, UI_STRING uis)
	{
	int ok = 0;

	switch (UI_get_string_type(uis))
	{
	case UIT_BOOLEAN:
	fputs(UI_get0_output_string(uis), tty_out);
	fputs(UI_get0_action_string(uis), tty_out);
	fflush(tty_out);
	return read_string_inner(ui, uis,
	UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 0);
	case UIT_PROMPT:
	fputs(UI_get0_output_string(uis), tty_out);
	fflush(tty_out);
	return read_string_inner(ui, uis,
	UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 1);
	case UIT_VERIFY:
	fprintf(tty_out,"Verifying - %s",
	UI_get0_output_string(uis));
	fflush(tty_out);
	if ((ok = read_string_inner(ui, uis,
	UI_get_input_flags(uis) & UI_INPUT_FLAG_ECHO, 1)) <= 0)
	return ok;
	if (strcmp(UI_get0_result_string(uis),
	UI_get0_test_string(uis)) != 0)
	{
	fprintf(tty_out,"Verify failure\n");
	fflush(tty_out);
	return 0;
	}
	break;
	default:
	break;
	}
	return 1;
	}


	#if !defined(OPENSSL_SYS_WIN16) && !defined(OPENSSL_SYS_WINCE)
	/* Internal functions to read a string without echoing */
	static void read_till_nl(FILE *in)
	{
	#define SIZE 4
	char buf[SIZE+1];

	do {
	fgets(buf,SIZE,in);
	} while (strchr(buf,'\n') == NULL);
	}

	static volatile sig_atomic_t intr_signal;
	#endif

	static int read_string_inner(UI ui, UI_STRING uis, int echo, int strip_nl)
	{
	static int ps;
	int ok;
	char result[BUFSIZ];
	int maxsize = BUFSIZ-1;
	#if !defined(OPENSSL_SYS_WIN16) && !defined(OPENSSL_SYS_WINCE)
	char *p;

	intr_signal=0;
	ok=0;
	ps=0;

	pushsig();
	ps=1;

	if (!echo && !noecho_console(ui))
	goto error;
	ps=2;

	result[0]='\0';
	#ifdef OPENSSL_SYS_MSDOS
	if (!echo)
	{
	noecho_fgets(result,maxsize,tty_in);
	p=result; /* FIXME: noecho_fgets doesn't return errors */
	}
	else
	p=fgets(result,maxsize,tty_in);
	#else
	p=fgets(result,maxsize,tty_in);
	#endif
	if(!p)
	goto error;
	if (feof(tty_in)) goto error;
	if (ferror(tty_in)) goto error;
	if ((p=(char *)strchr(result,'\n')) != NULL)
	{
	if (strip_nl)
	*p='\0';
	}
	else
	read_till_nl(tty_in);
	if (UI_set_result(ui, uis, result) >= 0)
	ok=1;

	error:
	if (intr_signal == SIGINT)
	ok=-1;
	if (!echo) fprintf(tty_out,"\n");
	if (ps >= 2 && !echo && !echo_console(ui))
	ok=0;

	if (ps >= 1)
	popsig();
	#else
	ok=1;
	#endif

	OPENSSL_cleanse(result,BUFSIZ);
	return ok;
	}


	/* Internal functions to open, handle and close a channel to the console. */
	static int open_console(UI *ui)
	{
	CRYPTO_w_lock(CRYPTO_LOCK_UI);
	is_a_tty = 1;

	#if defined(OPENSSL_SYS_MACINTOSH_CLASSIC) \|\| defined(OPENSSL_SYS_VXWORKS) \|\| defined(OPENSSL_SYS_NETWARE)
	tty_in=stdin;
	tty_out=stderr;
	#else
	# ifdef OPENSSL_SYS_MSDOS
	# define DEV_TTY "con"
	# else
	# define DEV_TTY "/dev/tty"
	# endif
	if ((tty_in=fopen(DEV_TTY,"r")) == NULL)
	tty_in=stdin;
	if ((tty_out=fopen(DEV_TTY,"w")) == NULL)
	tty_out=stderr;
	#endif

	#if defined(TTY_get) && !defined(OPENSSL_SYS_VMS)
	if (TTY_get(fileno(tty_in),&tty_orig) == -1)
	{
	#ifdef ENOTTY
	if (errno == ENOTTY)
	is_a_tty=0;
	else
	#endif
	#ifdef EINVAL
	/* Ariel Glenn ariel@columbia.edu reports that solaris
	* can return EINVAL instead. This should be ok */
	if (errno == EINVAL)
	is_a_tty=0;
	else
	#endif
	return 0;
	}
	#endif
	#ifdef OPENSSL_SYS_VMS
	status = sys$assign(&terminal,&channel,0,0);
	if (status != SS$_NORMAL)
	return 0;
	status=sys$qiow(0,channel,IO$_SENSEMODE,&iosb,0,0,tty_orig,12,0,0,0,0);
	if ((status != SS$_NORMAL) \|\| (iosb.iosb$w_value != SS$_NORMAL))
	return 0;
	#endif
	return 1;
	}

	static int noecho_console(UI *ui)
	{
	#ifdef TTY_FLAGS
	memcpy(&(tty_new),&(tty_orig),sizeof(tty_orig));
	tty_new.TTY_FLAGS &= ~ECHO;
	#endif

	#if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
	if (is_a_tty && (TTY_set(fileno(tty_in),&tty_new) == -1))
	return 0;
	#endif
	#ifdef OPENSSL_SYS_VMS
	tty_new[0] = tty_orig[0];
	tty_new[1] = tty_orig[1] \| TT$M_NOECHO;
	tty_new[2] = tty_orig[2];
	status = sys$qiow(0,channel,IO$_SETMODE,&iosb,0,0,tty_new,12,0,0,0,0);
	if ((status != SS$_NORMAL) \|\| (iosb.iosb$w_value != SS$_NORMAL))
	return 0;
	#endif
	return 1;
	}

	static int echo_console(UI *ui)
	{
	#if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
	memcpy(&(tty_new),&(tty_orig),sizeof(tty_orig));
	tty_new.TTY_FLAGS \|= ECHO;
	#endif

	#if defined(TTY_set) && !defined(OPENSSL_SYS_VMS)
	if (is_a_tty && (TTY_set(fileno(tty_in),&tty_new) == -1))
	return 0;
	#endif
	#ifdef OPENSSL_SYS_VMS
	tty_new[0] = tty_orig[0];
	tty_new[1] = tty_orig[1] & ~TT$M_NOECHO;
	tty_new[2] = tty_orig[2];
	status = sys$qiow(0,channel,IO$_SETMODE,&iosb,0,0,tty_new,12,0,0,0,0);
	if ((status != SS$_NORMAL) \|\| (iosb.iosb$w_value != SS$_NORMAL))
	return 0;
	#endif
	return 1;
	}

	static int close_console(UI *ui)
	{
	if (tty_in != stdin) fclose(tty_in);
	if (tty_out != stderr) fclose(tty_out);
	#ifdef OPENSSL_SYS_VMS
	status = sys$dassgn(channel);
	#endif
	CRYPTO_w_unlock(CRYPTO_LOCK_UI);

	return 1;
	}


	#if !defined(OPENSSL_SYS_WIN16) && !defined(OPENSSL_SYS_WINCE)
	/* Internal functions to handle signals and act on them */
	static void pushsig(void)
	{
	int i;
	#ifdef SIGACTION
	struct sigaction sa;

	memset(&sa,0,sizeof sa);
	sa.sa_handler=recsig;
	#endif

	for (i=1; i<NX509_SIG; i++)
	{
	#ifdef SIGUSR1
	if (i == SIGUSR1)
	continue;
	#endif
	#ifdef SIGUSR2
	if (i == SIGUSR2)
	continue;
	#endif
	#ifdef SIGKILL
	if (i == SIGKILL) /* We can't make any action on that. */
	continue;
	#endif
	#ifdef SIGACTION
	sigaction(i,&sa,&savsig[i]);
	#else
	savsig[i]=signal(i,recsig);
	#endif
	}

	#ifdef SIGWINCH
	signal(SIGWINCH,SIG_DFL);
	#endif
	}

	static void popsig(void)
	{
	int i;

	for (i=1; i<NX509_SIG; i++)
	{
	#ifdef SIGUSR1
	if (i == SIGUSR1)
	continue;
	#endif
	#ifdef SIGUSR2
	if (i == SIGUSR2)
	continue;
	#endif
	#ifdef SIGACTION
	sigaction(i,&savsig[i],NULL);
	#else
	signal(i,savsig[i]);
	#endif
	}
	}

	static void recsig(int i)
	{
	intr_signal=i;
	}
	#endif

	/* Internal functions specific for Windows */
	#if defined(OPENSSL_SYS_MSDOS) && !defined(OPENSSL_SYS_WIN16) && !defined(OPENSSL_SYS_WINCE)
	static int noecho_fgets(char buf, int size, FILE tty)
	{
	int i;
	char *p;

	p=buf;
	for (;;)
	{
	if (size == 0)
	{
	*p='\0';
	break;
	}
	size--;
	#ifdef WIN16TTY
	i=_inchar();
	#else
	i=getch();
	#endif
	if (i == '\r') i='\n';
	*(p++)=i;
	if (i == '\n')
	{
	*p='\0';
	break;
	}
	}
	#ifdef WIN_CONSOLE_BUG
	/* Win95 has several evil console bugs: one of these is that the
	* last character read using getch() is passed to the next read: this is
	* usually a CR so this can be trouble. No STDIO fix seems to work but
	* flushing the console appears to do the trick.
	*/
	{
	HANDLE inh;
	inh = GetStdHandle(STD_INPUT_HANDLE);
	FlushConsoleInputBuffer(inh);
	}
	#endif
	return(strlen(buf));
	}
	#endif