danicoin/src/simplewallet/password_container.cpp

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2014-03-03 22:07:58 +00:00
// Copyright (c) 2012-2013 The Cryptonote developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#include "password_container.h"
#include <iostream>
#include <memory.h>
#include <stdio.h>
#if defined(_WIN32)
#include <io.h>
#include <windows.h>
#else
#include <termios.h>
#include <unistd.h>
#endif
namespace tools
{
namespace
{
bool is_cin_tty();
}
password_container::password_container()
: m_empty(true)
{
}
password_container::password_container(std::string&& password)
: m_empty(false)
, m_password(std::move(password))
{
}
password_container::password_container(password_container&& rhs)
: m_empty(std::move(rhs.m_empty))
, m_password(std::move(rhs.m_password))
{
}
password_container::~password_container()
{
clear();
}
void password_container::clear()
{
if (0 < m_password.capacity())
{
m_password.replace(0, m_password.capacity(), m_password.capacity(), '\0');
m_password.resize(0);
}
m_empty = true;
}
bool password_container::read_password()
{
clear();
bool r;
if (is_cin_tty())
{
std::cout << "password: ";
r = read_from_tty();
}
else
{
r = read_from_file();
}
if (r)
{
m_empty = false;
}
else
{
clear();
}
return r;
}
bool password_container::read_from_file()
{
m_password.reserve(max_password_size);
for (size_t i = 0; i < max_password_size; ++i)
{
char ch = static_cast<char>(std::cin.get());
if (std::cin.eof() || ch == '\n' || ch == '\r')
{
break;
}
else if (std::cin.fail())
{
return false;
}
else
{
m_password.push_back(ch);
}
}
return true;
}
#if defined(_WIN32)
namespace
{
bool is_cin_tty()
{
return 0 != _isatty(_fileno(stdin));
}
}
bool password_container::read_from_tty()
{
const char BACKSPACE = 8;
HANDLE h_cin = ::GetStdHandle(STD_INPUT_HANDLE);
DWORD mode_old;
::GetConsoleMode(h_cin, &mode_old);
DWORD mode_new = mode_old & ~(ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT);
::SetConsoleMode(h_cin, mode_new);
bool r = true;
m_password.reserve(max_password_size);
while (m_password.size() < max_password_size)
{
DWORD read;
char ch;
r = (TRUE == ::ReadConsoleA(h_cin, &ch, 1, &read, NULL));
r &= (1 == read);
if (!r)
{
break;
}
else if (ch == '\n' || ch == '\r')
{
std::cout << std::endl;
break;
}
else if (ch == BACKSPACE)
{
if (!m_password.empty())
{
m_password.back() = '\0';
m_password.resize(m_password.size() - 1);
std::cout << "\b \b";
}
}
else
{
m_password.push_back(ch);
std::cout << '*';
}
}
::SetConsoleMode(h_cin, mode_old);
return r;
}
#else
namespace
{
bool is_cin_tty()
{
return 0 != isatty(fileno(stdin));
}
int getch()
{
struct termios tty_old;
tcgetattr(STDIN_FILENO, &tty_old);
struct termios tty_new;
tty_new = tty_old;
tty_new.c_lflag &= ~(ICANON | ECHO);
tcsetattr(STDIN_FILENO, TCSANOW, &tty_new);
int ch = getchar();
tcsetattr(STDIN_FILENO, TCSANOW, &tty_old);
return ch;
}
}
bool password_container::read_from_tty()
{
const char BACKSPACE = 127;
m_password.reserve(max_password_size);
while (m_password.size() < max_password_size)
{
int ch = getch();
if (EOF == ch)
{
return false;
}
else if (ch == '\n' || ch == '\r')
{
std::cout << std::endl;
break;
}
else if (ch == BACKSPACE)
{
if (!m_password.empty())
{
m_password.back() = '\0';
m_password.resize(m_password.size() - 1);
std::cout << "\b \b";
}
}
else
{
m_password.push_back(ch);
std::cout << '*';
}
}
return true;
}
#endif
}