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/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program 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 (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif
#include "syshead.h"
#include "console.h"
#include "error.h"
#include "buffer.h"
#include "misc.h"
#ifdef ENABLE_SYSTEMD
#include <systemd/sd-daemon.h>
#endif
#ifdef WIN32
#include "win32.h"
/*
* Get input from console.
*
* Return false on input error, or if service
* exit event is signaled.
*/
static bool
get_console_input_win32 (const char *prompt, const bool echo, char *input, const int capacity)
{
HANDLE in = INVALID_HANDLE_VALUE;
HANDLE err = INVALID_HANDLE_VALUE;
DWORD len = 0;
ASSERT (prompt);
ASSERT (input);
ASSERT (capacity > 0);
input[0] = '\0';
in = GetStdHandle (STD_INPUT_HANDLE);
err = get_orig_stderr ();
if (in != INVALID_HANDLE_VALUE
&& err != INVALID_HANDLE_VALUE
&& !win32_service_interrupt (&win32_signal)
&& WriteFile (err, prompt, strlen (prompt), &len, NULL))
{
bool is_console = (GetFileType (in) == FILE_TYPE_CHAR);
DWORD flags_save = 0;
int status = 0;
WCHAR *winput;
if (is_console)
{
if (GetConsoleMode (in, &flags_save))
{
DWORD flags = ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT;
if (echo)
flags |= ENABLE_ECHO_INPUT;
SetConsoleMode (in, flags);
}
else
is_console = 0;
}
if (is_console)
{
winput = malloc (capacity * sizeof (WCHAR));
if (winput == NULL)
return false;
status = ReadConsoleW (in, winput, capacity, &len, NULL);
WideCharToMultiByte (CP_UTF8, 0, winput, len, input, capacity, NULL, NULL);
free (winput);
}
else
status = ReadFile (in, input, capacity, &len, NULL);
string_null_terminate (input, (int)len, capacity);
chomp (input);
if (!echo)
WriteFile (err, "\r\n", 2, &len, NULL);
if (is_console)
SetConsoleMode (in, flags_save);
if (status && !win32_service_interrupt (&win32_signal))
return true;
}
return false;
}
#endif
#ifdef HAVE_GETPASS
static FILE *
open_tty (const bool write)
{
FILE *ret;
ret = fopen ("/dev/tty", write ? "w" : "r");
if (!ret)
ret = write ? stderr : stdin;
return ret;
}
static void
close_tty (FILE *fp)
{
if (fp != stderr && fp != stdin)
fclose (fp);
}
#endif
#ifdef ENABLE_SYSTEMD
/*
* is systemd running
*/
static bool
check_systemd_running ()
{
struct stat c;
/* We simply test whether the systemd cgroup hierarchy is
* mounted, as well as the systemd-ask-password executable
* being available */
return (sd_booted() > 0)
&& (stat(SYSTEMD_ASK_PASSWORD_PATH, &c) == 0);
}
static bool
get_console_input_systemd (const char *prompt, const bool echo, char *input, const int capacity)
{
int std_out;
bool ret = false;
struct argv argv;
argv_init (&argv);
argv_printf (&argv, SYSTEMD_ASK_PASSWORD_PATH);
argv_printf_cat (&argv, "%s", prompt);
if ((std_out = openvpn_popen (&argv, NULL)) < 0) {
return false;
}
CLEAR (*input);
if (read (std_out, input, capacity) != 0)
{
chomp (input);
ret = true;
}
close (std_out);
argv_reset (&argv);
return ret;
}
#endif
/*
* Get input from console
*/
bool
get_console_input (const char *prompt, const bool echo, char *input, const int capacity)
{
bool ret = false;
ASSERT (prompt);
ASSERT (input);
ASSERT (capacity > 0);
input[0] = '\0';
#ifdef ENABLE_SYSTEMD
if (check_systemd_running ())
return get_console_input_systemd (prompt, echo, input, capacity);
#endif
#if defined(WIN32)
return get_console_input_win32 (prompt, echo, input, capacity);
#elif defined(HAVE_GETPASS)
if (echo)
{
FILE *fp;
fp = open_tty (true);
fprintf (fp, "%s", prompt);
fflush (fp);
close_tty (fp);
fp = open_tty (false);
if (fgets (input, capacity, fp) != NULL)
{
chomp (input);
ret = true;
}
close_tty (fp);
}
else
{
char *gp = getpass (prompt);
if (gp)
{
strncpynt (input, gp, capacity);
memset (gp, 0, strlen (gp));
ret = true;
}
}
#else
msg (M_FATAL, "Sorry, but I can't get console input on this OS (%s)", prompt);
#endif
return ret;
}
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