ftpiiu_plugin/source/ftpConfig.cpp

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// ftpd is a server implementation based on the following:
// - RFC 959 (https://tools.ietf.org/html/rfc959)
// - RFC 3659 (https://tools.ietf.org/html/rfc3659)
// - suggested implementation details from https://cr.yp.to/ftp/filesystem.html
//
// Copyright (C) 2020 Michael Theall
//
// This program 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 3 of the License, or
// (at your option) any later version.
//
// 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. If not, see <https://www.gnu.org/licenses/>.
#include "ftpConfig.h"
#include "fs.h"
#include "log.h"
#include <sys/stat.h>
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#include <limits>
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namespace
{
constexpr std::uint16_t DEFAULT_PORT = 5000;
bool mkdirParent (std::string const &path_)
{
auto pos = path_.find_first_of ('/');
while (pos != std::string::npos)
{
auto const dir = path_.substr (0, pos);
struct stat st;
auto const rc = ::stat (dir.c_str (), &st);
if (rc < 0 && errno != ENOENT)
return false;
if (rc < 0 && errno == ENOENT)
{
auto const rc = ::mkdir (dir.c_str (), 0755);
if (rc < 0)
return false;
}
pos = path_.find_first_of ('/', pos + 1);
}
return true;
}
std::string strip (std::string const &str_)
{
auto const start = str_.find_first_not_of (" \t");
if (start == std::string::npos)
return {};
auto const end = str_.find_last_not_of (" \t");
if (end == std::string::npos)
return str_.substr (start);
return str_.substr (start, end + 1 - start);
}
template <typename T>
bool parseInt (T &out_, std::string const &val_)
{
T val = 0;
for (auto const &c : val_)
{
if (!std::isdigit (c))
{
errno = EINVAL;
return false;
}
if (std::numeric_limits<T>::max () / 10 < val)
{
errno = EOVERFLOW;
return false;
}
val *= 10;
auto const v = c - '0';
if (std::numeric_limits<T>::max () - v < val)
{
errno = EOVERFLOW;
return false;
}
val += v;
}
out_ = val;
return true;
}
}
///////////////////////////////////////////////////////////////////////////
FtpConfig::~FtpConfig () = default;
FtpConfig::FtpConfig () : m_port (DEFAULT_PORT)
{
}
UniqueFtpConfig FtpConfig::create ()
{
return UniqueFtpConfig (new FtpConfig ());
}
UniqueFtpConfig FtpConfig::load (char const *const path_)
{
auto config = create ();
auto fp = fs::File ();
if (!fp.open (path_))
return config;
std::uint16_t port = DEFAULT_PORT;
std::string line;
while (!(line = fp.readLine ()).empty ())
{
auto const pos = line.find_first_of ('=');
if (pos == std::string::npos)
{
error ("Ignoring '%s'\n", line.c_str ());
continue;
}
auto const key = strip (line.substr (0, pos));
auto const val = strip (line.substr (pos + 1));
if (key.empty () || val.empty ())
{
error ("Ignoring '%s'\n", line.c_str ());
continue;
}
if (key == "user")
config->m_user = val;
else if (key == "pass")
config->m_pass = val;
else if (key == "port")
parseInt (port, val);
#ifdef _3DS
else if (key == "mtime")
{
if (val == "0")
config->m_getMTime = false;
else if (val == "1")
config->m_getMTime = true;
else
error ("Invalid value for mtime: %s\n", val.c_str ());
}
#endif
}
config->setPort (port);
return config;
}
bool FtpConfig::save (char const *const path_)
{
if (!mkdirParent (path_))
return false;
auto fp = fs::File ();
if (!fp.open (path_, "wb"))
return false;
if (!m_user.empty ())
std::fprintf (fp, "user=%s\n", m_user.c_str ());
if (!m_pass.empty ())
std::fprintf (fp, "pass=%s\n", m_pass.c_str ());
std::fprintf (fp, "port=%u\n", m_port);
#ifdef _3DS
std::fprintf (fp, "mtime=%u\n", m_getMTime);
#endif
return true;
}
std::string const &FtpConfig::user () const
{
return m_user;
}
std::string const &FtpConfig::pass () const
{
return m_pass;
}
std::uint16_t FtpConfig::port () const
{
return m_port;
}
#ifdef _3DS
bool FtpConfig::getMTime () const
{
return m_getMTime;
}
#endif
void FtpConfig::setUser (std::string const &user_)
{
m_user = user_.substr (0, user_.find_first_of ('\0'));
}
void FtpConfig::setPass (std::string const &pass_)
{
m_pass = pass_.substr (0, pass_.find_first_of ('\0'));
}
bool FtpConfig::setPort (std::string const &port_)
{
std::uint16_t parsed;
if (!parseInt (parsed, port_))
return false;
return setPort (parsed);
}
bool FtpConfig::setPort (std::uint16_t const port_)
{
if (port_ < 1024
#if !defined(NDS) && !defined(_3DS)
&& port_ != 0
#endif
)
{
errno = EPERM;
return false;
}
m_port = port_;
return true;
}
#ifdef _3DS
void FtpConfig::setGetMTime (bool const getMTime_)
{
m_getMTime = getMTime_;
}
#endif