ui_openssl.c

开源的ssl算法openssl,版本0.9.8H

	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 [e-mail] 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)
	{
#ifndef OPENSSL_SYS_WIN32
	int i;
#endif
#ifdef SIGACTION
	struct sigaction sa;

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

#ifdef OPENSSL_SYS_WIN32
	savsig[SIGABRT]=signal(SIGABRT,recsig);
	savsig[SIGFPE]=signal(SIGFPE,recsig);
	savsig[SIGILL]=signal(SIGILL,recsig);
	savsig[SIGINT]=signal(SIGINT,recsig);
	savsig[SIGSEGV]=signal(SIGSEGV,recsig);
	savsig[SIGTERM]=signal(SIGTERM,recsig);
#else
	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
		}
#endif

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

static void popsig(void)
	{
#ifdef OPENSSL_SYS_WIN32
	signal(SIGABRT,savsig[SIGABRT]);
	signal(SIGFPE,savsig[SIGFPE]);
	signal(SIGILL,savsig[SIGILL]);
	signal(SIGINT,savsig[SIGINT]);
	signal(SIGSEGV,savsig[SIGSEGV]);
	signal(SIGTERM,savsig[SIGTERM]);
#else
	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
		}
#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