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gnupg/util/ttyio.c

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/* ttyio.c - tty i/O functions
* Copyright (C) 1998, 1999, 2000, 2001, 2002,
* 2004 Free Software Foundation, Inc.
*
* This file is part of GnuPG.
*
* GnuPG is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GnuPG is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdarg.h>
#include <unistd.h>
#ifdef HAVE_TCGETATTR
#include <termios.h>
#else
#ifdef HAVE_TERMIO_H
/* simulate termios with termio */
#include <termio.h>
#define termios termio
#define tcsetattr ioctl
#define TCSAFLUSH TCSETAF
#define tcgetattr(A,B) ioctl(A,TCGETA,B)
#define HAVE_TCGETATTR
#endif
#endif
#ifdef _WIN32 /* use the odd Win32 functions */
#include <windows.h>
#ifdef HAVE_TCGETATTR
#error windows and termios
#endif
#endif
#include <errno.h>
#include <ctype.h>
#ifdef HAVE_LIBREADLINE
#include <readline/readline.h>
#include <readline/history.h>
#endif
#include "util.h"
#include "memory.h"
#include "ttyio.h"
#define CONTROL_D ('D' - 'A' + 1)
#ifdef _WIN32 /* use the odd Win32 functions */
static struct {
HANDLE in, out;
} con;
#define DEF_INPMODE (ENABLE_LINE_INPUT|ENABLE_ECHO_INPUT \
|ENABLE_PROCESSED_INPUT )
#define HID_INPMODE (ENABLE_LINE_INPUT|ENABLE_PROCESSED_INPUT )
#define DEF_OUTMODE (ENABLE_WRAP_AT_EOL_OUTPUT|ENABLE_PROCESSED_OUTPUT)
#else /* yeah, we have a real OS */
static FILE *ttyfp = NULL;
#endif
static int initialized;
static int last_prompt_len;
static int batchmode;
static int no_terminal;
#ifdef HAVE_TCGETATTR
static struct termios termsave;
static int restore_termios;
#endif
/* This is a wrapper around ttyname so that we can use it even when
the standard streams are redirected. It figures the name out the
first time and returns it in a statically allocated buffer. */
const char *
tty_get_ttyname (void)
{
static char *name;
/* On a GNU system ctermid() always return /dev/tty, so this does
not make much sense - however if it is ever changed we do the
Right Thing now. */
#ifdef HAVE_CTERMID
static int got_name;
if (!got_name)
{
const char *s;
s = ctermid (NULL);
if (s)
name = strdup (s);
got_name = 1;
}
#endif
/* Assume the standard tty on memory error or when there is no
ctermid. */
return name? name : "/dev/tty";
}
#ifdef HAVE_TCGETATTR
static void
cleanup(void)
{
if( restore_termios ) {
restore_termios = 0; /* do it prios in case it is interrupted again */
if( tcsetattr(fileno(ttyfp), TCSAFLUSH, &termsave) )
log_error("tcsetattr() failed: %s\n", strerror(errno) );
}
}
#endif
static void
init_ttyfp(void)
{
if( initialized )
return;
#if defined(_WIN32)
{
SECURITY_ATTRIBUTES sa;
memset(&sa, 0, sizeof(sa));
sa.nLength = sizeof(sa);
sa.bInheritHandle = TRUE;
con.out = CreateFileA( "CONOUT$", GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
&sa, OPEN_EXISTING, 0, 0 );
if( con.out == INVALID_HANDLE_VALUE )
log_fatal ("open(CONOUT$) failed: %s", w32_strerror (0));
memset(&sa, 0, sizeof(sa));
sa.nLength = sizeof(sa);
sa.bInheritHandle = TRUE;
con.in = CreateFileA( "CONIN$", GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
&sa, OPEN_EXISTING, 0, 0 );
if (con.in == INVALID_HANDLE_VALUE)
log_fatal ("open(CONIN$) failed: %s", w32_strerror (0));
}
SetConsoleMode(con.in, DEF_INPMODE );
SetConsoleMode(con.out, DEF_OUTMODE );
#elif defined(__EMX__)
ttyfp = stdout; /* Fixme: replace by the real functions: see wklib */
#else
ttyfp = batchmode? stderr : fopen( tty_get_ttyname (), "r+");
if( !ttyfp ) {
log_error("cannot open `%s': %s\n",
tty_get_ttyname (), strerror(errno) );
exit(2);
}
#ifdef HAVE_LIBREADLINE
rl_catch_signals = 0;
rl_instream = rl_outstream = ttyfp;
rl_inhibit_completion = 1;
#endif
#endif
#ifdef HAVE_TCGETATTR
atexit( cleanup );
#endif
initialized = 1;
}
#ifdef HAVE_LIBREADLINE
void
tty_enable_completion(rl_completion_func_t *completer)
{
if( !initialized )
init_ttyfp();
rl_attempted_completion_function=completer;
rl_inhibit_completion=0;
}
void
tty_disable_completion(void)
{
if( !initialized )
init_ttyfp();
rl_inhibit_completion=1;
}
#endif /*HAVE_LIBREADLINE*/
int
tty_batchmode( int onoff )
{
int old = batchmode;
if( onoff != -1 )
batchmode = onoff;
return old;
}
int
tty_no_terminal(int onoff)
{
int old = no_terminal;
no_terminal = onoff ? 1 : 0;
return old;
}
void
tty_printf( const char *fmt, ... )
{
va_list arg_ptr;
if (no_terminal)
return;
if( !initialized )
init_ttyfp();
va_start( arg_ptr, fmt ) ;
#ifdef _WIN32
{
char *buf = NULL;
int n;
DWORD nwritten;
n = vasprintf(&buf, fmt, arg_ptr);
if( !buf )
log_bug("vasprintf() failed\n");
if (!WriteConsoleA (con.out, buf, n, &nwritten, NULL))
log_fatal ("WriteConsole failed: %s", w32_strerror (0));
if( n != nwritten )
log_fatal ("WriteConsole failed: %d != %d\n", n, (int)nwritten );
last_prompt_len += n;
m_free (buf);
}
#else
last_prompt_len += vfprintf(ttyfp,fmt,arg_ptr) ;
fflush(ttyfp);
#endif
va_end(arg_ptr);
}
/* Same as tty_printf but if FP is not NULL, behave like the standard
fprintf. */
void
tty_fprintf (FILE *fp, const char *fmt, ... )
{
va_list arg_ptr;
if (fp)
{
va_start (arg_ptr, fmt) ;
vfprintf (fp, fmt, arg_ptr );
va_end (arg_ptr);
return;
}
if (no_terminal)
return;
if( !initialized )
init_ttyfp();
va_start( arg_ptr, fmt ) ;
#ifdef _WIN32
{
char *buf = NULL;
int n;
DWORD nwritten;
n = vasprintf(&buf, fmt, arg_ptr);
if( !buf )
log_bug("vasprintf() failed\n");
if (!WriteConsoleA (con.out, buf, n, &nwritten, NULL))
log_fatal ("WriteConsole failed: %s", w32_strerror (0));
if (n != nwritten)
log_fatal ("WriteConsole failed: %d != %d\n", n, (int)nwritten);
last_prompt_len += n;
xfree (buf);
}
#else
last_prompt_len += vfprintf(ttyfp,fmt,arg_ptr) ;
fflush(ttyfp);
#endif
va_end(arg_ptr);
}
/****************
* Print a string, but filter all control characters out.
*/
void
tty_print_string( const byte *p, size_t n )
{
if (no_terminal)
return;
if( !initialized )
init_ttyfp();
#ifdef _WIN32
/* not so effective, change it if you want */
for( ; n; n--, p++ )
if( iscntrl( *p ) ) {
if( *p == '\n' )
tty_printf("\\n");
else if( !*p )
tty_printf("\\0");
else
tty_printf("\\x%02x", *p);
}
else
tty_printf("%c", *p);
#else
for( ; n; n--, p++ )
if( iscntrl( *p ) ) {
putc('\\', ttyfp);
if( *p == '\n' )
putc('n', ttyfp);
else if( !*p )
putc('0', ttyfp);
else
fprintf(ttyfp, "x%02x", *p );
}
else
putc(*p, ttyfp);
#endif
}
void
tty_print_utf8_string2 (const byte *p, size_t n, size_t max_n )
{
size_t i;
char *buf;
if (no_terminal)
return;
/* we can handle plain ascii simpler, so check for it first */
for(i=0; i < n; i++ ) {
if( p[i] & 0x80 )
break;
}
if( i < n ) {
buf = utf8_to_native( p, n, 0 );
if( max_n && (strlen( buf ) > max_n )) {
buf[max_n] = 0;
}
/*(utf8 conversion already does the control character quoting)*/
tty_printf("%s", buf );
m_free( buf );
}
else {
if( max_n && (n > max_n) ) {
n = max_n;
}
tty_print_string( p, n );
}
}
void
tty_print_utf8_string( const byte *p, size_t n )
{
tty_print_utf8_string2( p, n, 0 );
}
static char *
do_get( const char *prompt, int hidden )
{
char *buf;
#ifndef __riscos__
byte cbuf[1];
#endif
int c, n, i;
if( batchmode ) {
log_error("Sorry, we are in batchmode - can't get input\n");
exit(2);
}
if (no_terminal) {
log_error("Sorry, no terminal at all requested - can't get input\n");
exit(2);
}
if( !initialized )
init_ttyfp();
last_prompt_len = 0;
tty_printf( "%s", prompt );
buf = m_alloc(n=50);
i = 0;
#ifdef _WIN32 /* windoze version */
if( hidden )
SetConsoleMode(con.in, HID_INPMODE );
for(;;) {
DWORD nread;
if (!ReadConsoleA (con.in, cbuf, 1, &nread, NULL))
log_fatal ("ReadConsole failed: %s", w32_strerror (0));
if( !nread )
continue;
if( *cbuf == '\n' )
break;
if( !hidden )
last_prompt_len++;
c = *cbuf;
if( c == '\t' )
c = ' ';
else if( c > 0xa0 )
; /* we don't allow 0xa0, as this is a protected blank which may
* confuse the user */
else if( iscntrl(c) )
continue;
if( !(i < n-1) ) {
n += 50;
buf = m_realloc( buf, n );
}
buf[i++] = c;
}
if( hidden )
SetConsoleMode(con.in, DEF_INPMODE );
#elif defined(__riscos__)
do {
c = riscos_getchar();
if (c == 0xa || c == 0xd) { /* Return || Enter */
c = (int) '\n';
} else if (c == 0x8 || c == 0x7f) { /* Backspace || Delete */
if (i>0) {
i--;
if (!hidden) {
last_prompt_len--;
fputc(8, ttyfp);
fputc(32, ttyfp);
fputc(8, ttyfp);
fflush(ttyfp);
}
} else {
fputc(7, ttyfp);
fflush(ttyfp);
}
continue;
} else if (c == (int) '\t') { /* Tab */
c = ' ';
} else if (c > 0xa0) {
; /* we don't allow 0xa0, as this is a protected blank which may
* confuse the user */
} else if (iscntrl(c)) {
continue;
}
if(!(i < n-1)) {
n += 50;
buf = m_realloc(buf, n);
}
buf[i++] = c;
if (!hidden) {
last_prompt_len++;
fputc(c, ttyfp);
fflush(ttyfp);
}
} while (c != '\n');
i = (i>0) ? i-1 : 0;
#else /* unix version */
if( hidden ) {
#ifdef HAVE_TCGETATTR
struct termios term;
if( tcgetattr(fileno(ttyfp), &termsave) )
log_fatal("tcgetattr() failed: %s\n", strerror(errno) );
restore_termios = 1;
term = termsave;
term.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
if( tcsetattr( fileno(ttyfp), TCSAFLUSH, &term ) )
log_fatal("tcsetattr() failed: %s\n", strerror(errno) );
#endif
}
/* fixme: How can we avoid that the \n is echoed w/o disabling
* canonical mode - w/o this kill_prompt can't work */
while( read(fileno(ttyfp), cbuf, 1) == 1 && *cbuf != '\n' ) {
if( !hidden )
last_prompt_len++;
c = *cbuf;
if( c == CONTROL_D )
log_info("control d found\n");
if( c == '\t' )
c = ' ';
else if( c > 0xa0 )
; /* we don't allow 0xa0, as this is a protected blank which may
* confuse the user */
else if( iscntrl(c) )
continue;
if( !(i < n-1) ) {
n += 50;
buf = m_realloc( buf, n );
}
buf[i++] = c;
}
if( *cbuf != '\n' ) {
buf[0] = CONTROL_D;
i = 1;
}
if( hidden ) {
#ifdef HAVE_TCGETATTR
if( tcsetattr(fileno(ttyfp), TCSAFLUSH, &termsave) )
log_error("tcsetattr() failed: %s\n", strerror(errno) );
restore_termios = 0;
#endif
}
#endif /* end unix version */
buf[i] = 0;
return buf;
}
char *
tty_get( const char *prompt )
{
#ifdef HAVE_LIBREADLINE
if (!batchmode && !no_terminal) {
char *line;
char *buf;
if( !initialized )
init_ttyfp();
last_prompt_len = 0;
line = readline (prompt?prompt:"");
/* We need to copy it to memory controlled by our malloc
implementations; further we need to convert an EOF to our
convention. */
buf = m_alloc(line? strlen(line)+1:2);
if (line)
{
strcpy (buf, line);
trim_spaces (buf);
if (strlen (buf) > 2 )
add_history (line); /* Note that we test BUF but add LINE. */
free (line);
}
else
{
buf[0] = CONTROL_D;
buf[1] = 0;
}
return buf;
}
else
#endif /* HAVE_LIBREADLINE */
return do_get( prompt, 0 );
}
char *
tty_get_hidden( const char *prompt )
{
return do_get( prompt, 1 );
}
void
tty_kill_prompt()
{
if ( no_terminal )
return;
if( !initialized )
init_ttyfp();
if( batchmode )
last_prompt_len = 0;
if( !last_prompt_len )
return;
#ifdef _WIN32
tty_printf("\r%*s\r", last_prompt_len, "");
#else
{
int i;
putc('\r', ttyfp);
for(i=0; i < last_prompt_len; i ++ )
putc(' ', ttyfp);
putc('\r', ttyfp);
fflush(ttyfp);
}
#endif
last_prompt_len = 0;
}
int
tty_get_answer_is_yes( const char *prompt )
{
int yes;
char *p = tty_get( prompt );
tty_kill_prompt();
yes = answer_is_yes(p);
m_free(p);
return yes;
}
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