ftpiiu_plugin/source/ftpServer.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 "ftpServer.h"
#include "fs.h"
#include "imgui.h"
#include <arpa/inet.h>
#include <poll.h>
#include <unistd.h>
#include <chrono>
#include <cstdio>
#include <cstring>
#include <mutex>
#include <thread>
using namespace std::chrono_literals;
namespace
{
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/// \brief Application start time
auto const s_startTime = std::time (nullptr);
/// \brief Mutex for s_freeSpace
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platform::Mutex s_lock;
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/// \brief Free space string
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std::string s_freeSpace;
}
///////////////////////////////////////////////////////////////////////////
FtpServer::~FtpServer ()
{
m_quit = true;
m_thread.join ();
}
FtpServer::FtpServer (std::uint16_t const port_)
: m_log (Log::create ()), m_port (port_), m_quit (false)
{
Log::bind (m_log);
handleStartButton ();
m_thread = platform::Thread (std::bind (&FtpServer::threadFunc, this));
}
void FtpServer::draw ()
{
auto const &io = ImGui::GetIO ();
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auto const width = io.DisplaySize.x;
auto const height = io.DisplaySize.y;
ImGui::SetNextWindowPos (ImVec2 (0, 0), ImGuiCond_FirstUseEver);
#ifdef _3DS
// top screen
ImGui::SetNextWindowSize (ImVec2 (width, height / 2.0f));
#else
ImGui::SetNextWindowSize (ImVec2 (width, height));
#endif
ImGui::Begin (STATUS_STRING,
nullptr,
ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize);
{
auto const lock = std::scoped_lock (m_lock);
if (!m_socket)
{
if (ImGui::Button ("Start"))
handleStartButton ();
}
else if (ImGui::Button ("Stop"))
handleStopButton ();
if (m_socket)
{
ImGui::SameLine ();
ImGui::TextUnformatted (m_name.c_str ());
}
}
{
auto const lock = std::scoped_lock (s_lock);
if (!s_freeSpace.empty ())
{
ImGui::SameLine ();
ImGui::TextUnformatted (s_freeSpace.c_str ());
}
}
ImGui::Separator ();
#ifdef _3DS
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// Fill rest of top screen window
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ImGui::BeginChild ("Logs", ImVec2 (0, 0), false, ImGuiWindowFlags_HorizontalScrollbar);
#else
ImGui::BeginChild ("Logs", ImVec2 (0, 200), false, ImGuiWindowFlags_HorizontalScrollbar);
#endif
m_log->draw ();
ImGui::EndChild ();
#ifdef _3DS
ImGui::End ();
// bottom screen
ImGui::SetNextWindowSize (ImVec2 (width * 0.8f, height / 2.0f));
ImGui::SetNextWindowPos (ImVec2 (width * 0.1f, height / 2.0f), ImGuiCond_FirstUseEver);
ImGui::Begin ("Sessions",
nullptr,
ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize);
#else
ImGui::Separator ();
#endif
for (auto &session : m_sessions)
session->draw ();
ImGui::End ();
}
UniqueFtpServer FtpServer::create (std::uint16_t const port_)
{
updateFreeSpace ();
return UniqueFtpServer (new FtpServer (port_));
}
void FtpServer::updateFreeSpace ()
{
#if defined(_3DS) || defined(__SWITCH__)
struct statvfs st;
if (::statvfs ("sdmc:/", &st) != 0)
return;
auto const lock = std::scoped_lock (s_lock);
s_freeSpace = fs::printSize (static_cast<std::uint64_t> (st.f_bsize) * st.f_bfree);
#endif
}
std::time_t FtpServer::startTime ()
{
return s_startTime;
}
void FtpServer::handleStartButton ()
{
if (m_socket)
return;
struct sockaddr_in addr;
addr.sin_family = AF_INET;
#if defined(_3DS) || defined(__SWITCH__)
addr.sin_addr.s_addr = gethostid ();
#else
addr.sin_addr.s_addr = INADDR_ANY;
#endif
addr.sin_port = htons (m_port);
auto socket = Socket::create ();
if (!socket)
return;
if (m_port != 0 && !socket->setReuseAddress (true))
return;
if (!socket->bind (addr))
return;
if (!socket->listen (10))
return;
auto const &sockName = socket->sockName ();
auto const name = sockName.name ();
m_name.resize (std::strlen (name) + 3 + 5);
m_name.resize (std::sprintf (&m_name[0], "[%s]:%u", name, sockName.port ()));
Log::info ("Started server at %s\n", m_name.c_str ());
m_socket = std::move (socket);
}
void FtpServer::handleStopButton ()
{
m_socket.reset ();
Log::info ("Stopped server at %s\n", m_name.c_str ());
}
void FtpServer::loop ()
{
{
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// poll listen socket
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auto const lock = std::scoped_lock (m_lock);
if (m_socket)
{
Socket::PollInfo info{*m_socket, POLLIN, 0};
if (Socket::poll (&info, 1, 0ms) > 0)
{
auto socket = m_socket->accept ();
if (socket)
m_sessions.emplace_back (FtpSession::create (std::move (socket)));
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else
handleStopButton ();
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}
}
}
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// remove dead sessions
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for (auto it = std::begin (m_sessions); it != std::end (m_sessions);)
{
auto const &session = *it;
if (session->dead ())
it = m_sessions.erase (it);
else
++it;
}
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// poll sessions
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if (!m_sessions.empty ())
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{
if (!FtpSession::poll (m_sessions))
handleStopButton ();
}
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// avoid busy polling in background thread
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else
platform::Thread::sleep (16ms);
}
void FtpServer::threadFunc ()
{
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// bind log for this thread
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Log::bind (m_log);
while (!m_quit)
loop ();
}