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"
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#include "licenses.h"
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#include "log.h"
#include "platform.h"
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#include "socket.h"
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#include "imgui.h"
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#ifdef NDS
#include <dswifi9.h>
#endif
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#include <arpa/inet.h>
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#include <sys/statvfs.h>
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#include <unistd.h>
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#include <cctype>
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#include <chrono>
#include <cstdio>
#include <cstring>
#include <mutex>
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#include <string_view>
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#include <thread>
using namespace std::chrono_literals;
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#ifdef NDS
#define LOCKED(x) x
#else
#define LOCKED(x) \
do \
{ \
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auto const lock = std::lock_guard (m_lock); \
x; \
} while (0)
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#endif
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namespace
{
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/// \brief Application start time
auto const s_startTime = std::time (nullptr);
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#ifndef NDS
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/// \brief Mutex for s_freeSpace
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platform::Mutex s_lock;
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#endif
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/// \brief Free space string
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std::string s_freeSpace;
}
///////////////////////////////////////////////////////////////////////////
FtpServer::~FtpServer ()
{
m_quit = true;
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#ifndef NDS
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m_thread.join ();
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#endif
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}
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FtpServer::FtpServer (UniqueFtpConfig config_) : m_config (std::move (config_)), m_quit (false)
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{
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#ifndef NDS
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m_thread = platform::Thread (std::bind (&FtpServer::threadFunc, this));
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#endif
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}
void FtpServer::draw ()
{
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#ifdef NDS
loop ();
#endif
#ifdef CLASSIC
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{
char port[7];
#ifndef NDS
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auto const lock = std::lock_guard (m_lock);
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#endif
if (m_socket)
std::sprintf (port, ":%u", m_socket->sockName ().port ());
consoleSelect (&g_statusConsole);
std::printf ("\x1b[0;0H\x1b[32;1m%s \x1b[36;1m%s%s",
STATUS_STRING,
m_socket ? m_socket->sockName ().name () : "Waiting on WiFi",
m_socket ? port : "");
#ifndef NDS
char timeBuffer[16];
auto const now = std::time (nullptr);
std::strftime (timeBuffer, sizeof (timeBuffer), "%H:%M:%S", std::localtime (&now));
std::printf (" \x1b[37;1m%s", timeBuffer);
#endif
std::fputs ("\x1b[K", stdout);
std::fflush (stdout);
}
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{
#ifndef NDS
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auto const lock = std::lock_guard (s_lock);
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#endif
if (!s_freeSpace.empty ())
{
consoleSelect (&g_statusConsole);
std::printf ("\x1b[0;%uH\x1b[32;1m%s",
static_cast<unsigned> (g_statusConsole.windowWidth - s_freeSpace.size () + 1),
s_freeSpace.c_str ());
std::fflush (stdout);
}
}
{
#ifndef NDS
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auto const lock = std::lock_guard (m_lock);
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#endif
consoleSelect (&g_sessionConsole);
std::fputs ("\x1b[2J", stdout);
for (auto &session : m_sessions)
{
session->draw ();
if (&session != &m_sessions.back ())
std::fputc ('\n', stdout);
}
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std::fflush (stdout);
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}
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drawLog ();
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#else
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 * 0.5f));
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#else
ImGui::SetNextWindowSize (ImVec2 (width, height));
#endif
{
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char title[64];
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{
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auto const serverLock = std::lock_guard (m_lock);
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std::snprintf (title,
sizeof (title),
STATUS_STRING " %s###ftpd",
m_socket ? m_name.c_str () : "Waiting for WiFi...");
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}
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ImGui::Begin (title,
nullptr,
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ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize
#ifndef _3DS
| ImGuiWindowFlags_MenuBar
#endif
);
}
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#ifndef _3DS
showMenu ();
#endif
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#ifndef _3DS
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ImGui::BeginChild (
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"Logs", ImVec2 (0, 0.5f * height), false, ImGuiWindowFlags_HorizontalScrollbar);
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#endif
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drawLog ();
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#ifndef _3DS
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ImGui::EndChild ();
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#endif
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#ifdef _3DS
ImGui::End ();
// bottom screen
ImGui::SetNextWindowSize (ImVec2 (width * 0.8f, height * 0.5f));
ImGui::SetNextWindowPos (ImVec2 (width * 0.1f, height * 0.5f), ImGuiCond_FirstUseEver);
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ImGui::Begin ("Sessions",
nullptr,
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ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize |
ImGuiWindowFlags_MenuBar);
showMenu ();
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#else
ImGui::Separator ();
#endif
{
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auto const lock = std::lock_guard (m_lock);
for (auto &session : m_sessions)
session->draw ();
}
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ImGui::End ();
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#endif
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}
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UniqueFtpServer FtpServer::create ()
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{
updateFreeSpace ();
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auto config = FtpConfig::load (FTPDCONFIG);
return UniqueFtpServer (new FtpServer (std::move (config)));
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}
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std::string FtpServer::getFreeSpace ()
{
#ifndef NDS
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auto const lock = std::lock_guard (s_lock);
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#endif
return s_freeSpace;
}
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void FtpServer::updateFreeSpace ()
{
struct statvfs st;
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#if defined(NDS) || defined(_3DS) || defined(__SWITCH__)
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if (::statvfs ("sdmc:/", &st) != 0)
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#else
if (::statvfs ("/", &st) != 0)
#endif
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return;
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auto freeSpace = fs::printSize (static_cast<std::uint64_t> (st.f_bsize) * st.f_bfree);
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#ifndef NDS
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auto const lock = std::lock_guard (s_lock);
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#endif
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if (freeSpace != s_freeSpace)
s_freeSpace = std::move (freeSpace);
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}
std::time_t FtpServer::startTime ()
{
return s_startTime;
}
void FtpServer::handleNetworkFound ()
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{
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SockAddr addr;
if (!platform::networkAddress (addr))
return;
std::uint16_t port;
{
#ifndef NDS
auto const lock = m_config->lockGuard ();
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#endif
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port = m_config->port ();
}
addr.setPort (port);
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auto socket = Socket::create ();
if (!socket)
return;
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if (port != 0 && !socket->setReuseAddress (true))
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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);
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m_name.resize (std::sprintf (m_name.data (), "[%s]:%u", name, sockName.port ()));
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info ("Started server at %s\n", m_name.c_str ());
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LOCKED (m_socket = std::move (socket));
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}
void FtpServer::handleNetworkLost ()
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{
{
// destroy sessions
std::vector<UniqueFtpSession> sessions;
LOCKED (sessions = std::move (m_sessions));
}
{
// destroy command socket
UniqueSocket sock;
LOCKED (sock = std::move (m_socket));
}
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info ("Stopped server at %s\n", m_name.c_str ());
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}
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#ifndef CLASSIC
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void FtpServer::showMenu ()
{
auto const prevShowSettings = m_showSettings;
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auto const prevShowAbout = m_showAbout;
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if (ImGui::BeginMenuBar ())
{
#if defined(_3DS) || defined(__SWITCH__)
if (ImGui::BeginMenu (u8"Menu \xee\x80\x83")) // Y Button
#else
if (ImGui::BeginMenu ("Menu"))
#endif
{
if (ImGui::MenuItem ("Settings"))
m_showSettings = true;
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if (ImGui::MenuItem ("About"))
m_showAbout = true;
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ImGui::EndMenu ();
}
ImGui::EndMenuBar ();
}
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if (m_showSettings)
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{
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if (!prevShowSettings)
{
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#ifndef NDS
auto const lock = m_config->lockGuard ();
#endif
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m_userSetting = m_config->user ();
m_userSetting.resize (32);
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m_passSetting = m_config->pass ();
m_passSetting.resize (32);
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m_portSetting = m_config->port ();
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#ifdef _3DS
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m_getMTimeSetting = m_config->getMTime ();
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#endif
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#ifdef __SWITCH__
m_enableAPSetting = m_config->enableAP ();
m_ssidSetting = m_config->ssid ();
m_ssidSetting.resize (19);
m_passphraseSetting = m_config->passphrase ();
m_passphraseSetting.resize (63);
#endif
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ImGui::OpenPopup ("Settings");
}
showSettings ();
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}
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if (m_showAbout)
{
if (!prevShowAbout)
ImGui::OpenPopup ("About");
showAbout ();
}
}
void FtpServer::showSettings ()
{
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#ifdef _3DS
auto const &io = ImGui::GetIO ();
auto const width = io.DisplaySize.x;
auto const height = io.DisplaySize.y;
ImGui::SetNextWindowSize (ImVec2 (width * 0.8f, height * 0.5f));
ImGui::SetNextWindowPos (ImVec2 (width * 0.1f, height * 0.5f));
if (ImGui::BeginPopupModal ("Settings",
nullptr,
ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize))
#else
if (ImGui::BeginPopupModal ("Settings", nullptr, ImGuiWindowFlags_AlwaysAutoResize))
#endif
{
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ImGui::InputText ("User",
m_userSetting.data (),
m_userSetting.size (),
ImGuiInputTextFlags_AutoSelectAll);
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ImGui::InputText ("Pass",
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m_passSetting.data (),
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m_passSetting.size (),
ImGuiInputTextFlags_AutoSelectAll | ImGuiInputTextFlags_Password);
ImGui::InputScalar ("Port",
ImGuiDataType_U16,
&m_portSetting,
nullptr,
nullptr,
"%u",
ImGuiInputTextFlags_AutoSelectAll);
#ifdef _3DS
ImGui::Checkbox ("Get mtime", &m_getMTimeSetting);
#endif
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#ifdef __SWITCH__
ImGui::Checkbox ("Enable Access Point", &m_enableAPSetting);
ImGui::InputText ("SSID",
m_ssidSetting.data (),
m_ssidSetting.size (),
ImGuiInputTextFlags_AutoSelectAll);
auto const ssidError = platform::validateSSID (m_ssidSetting);
if (ssidError)
ImGui::TextColored (ImVec4 (1.0f, 0.4f, 0.4f, 1.0f), ssidError);
ImGui::InputText ("Passphrase",
m_passphraseSetting.data (),
m_passphraseSetting.size (),
ImGuiInputTextFlags_AutoSelectAll | ImGuiInputTextFlags_Password);
auto const passphraseError = platform::validatePassphrase (m_passphraseSetting);
if (passphraseError)
ImGui::TextColored (ImVec4 (1.0f, 0.4f, 0.4f, 1.0f), passphraseError);
#endif
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auto const apply = ImGui::Button ("Apply", ImVec2 (100, 0));
ImGui::SameLine ();
auto const save = ImGui::Button ("Save", ImVec2 (100, 0));
ImGui::SameLine ();
auto const cancel = ImGui::Button ("Cancel", ImVec2 (100, 0));
if (apply || save)
{
m_showSettings = false;
ImGui::CloseCurrentPopup ();
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#ifndef NDS
auto const lock = m_config->lockGuard ();
#endif
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m_config->setUser (m_userSetting);
m_config->setPass (m_passSetting);
m_config->setPort (m_portSetting);
#ifdef _3DS
m_config->setGetMTime (m_getMTimeSetting);
#endif
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#ifdef __SWITCH__
m_config->setEnableAP (m_enableAPSetting);
m_config->setSSID (m_ssidSetting);
m_config->setPassphrase (m_passphraseSetting);
m_apError = false;
#endif
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UniqueSocket socket;
LOCKED (socket = std::move (m_socket));
}
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{
#ifndef NDS
auto const lock = m_config->lockGuard ();
#endif
if (save && !m_config->save (FTPDCONFIG))
error ("Failed to save config\n");
}
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if (apply || save || cancel)
{
m_showSettings = false;
ImGui::CloseCurrentPopup ();
}
ImGui::EndPopup ();
}
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}
void FtpServer::showAbout ()
{
auto const &io = ImGui::GetIO ();
auto const width = io.DisplaySize.x;
auto const height = io.DisplaySize.y;
#ifdef _3DS
ImGui::SetNextWindowSize (ImVec2 (width * 0.8f, height * 0.5f));
ImGui::SetNextWindowPos (ImVec2 (width * 0.1f, height * 0.5f));
#else
ImGui::SetNextWindowSize (ImVec2 (width * 0.8f, height * 0.8f));
ImGui::SetNextWindowPos (ImVec2 (width * 0.1f, height * 0.1f));
#endif
if (ImGui::BeginPopupModal ("About",
nullptr,
ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoMove | ImGuiWindowFlags_NoResize))
{
ImGui::TextUnformatted (STATUS_STRING);
ImGui::TextWrapped ("Copyright © 2014-2020 Michael Theall, Dave Murphy, TuxSH");
ImGui::Separator ();
ImGui::Text ("Platform: %s", io.BackendPlatformName);
ImGui::Text ("Renderer: %s", io.BackendRendererName);
if (ImGui::Button ("OK", ImVec2 (100, 0)))
{
m_showAbout = false;
ImGui::CloseCurrentPopup ();
}
ImGui::Separator ();
if (ImGui::TreeNode (g_dearImGuiVersion))
{
ImGui::TextWrapped (g_dearImGuiCopyright);
ImGui::Separator ();
ImGui::TextWrapped (g_mitLicense);
ImGui::TreePop ();
}
#if defined(NDS)
#elif defined(_3DS)
if (ImGui::TreeNode (g_libctruVersion))
{
ImGui::TextWrapped (g_zlibLicense);
ImGui::Separator ();
ImGui::TextWrapped (g_zlibLicense);
ImGui::TreePop ();
}
if (ImGui::TreeNode (g_citro3dVersion))
{
ImGui::TextWrapped (g_citro3dCopyright);
ImGui::Separator ();
ImGui::TextWrapped (g_zlibLicense);
ImGui::TreePop ();
}
#elif defined(__SWITCH__)
if (ImGui::TreeNode (g_libnxVersion))
{
ImGui::TextWrapped (g_libnxCopyright);
ImGui::Separator ();
ImGui::TextWrapped (g_libnxLicense);
ImGui::TreePop ();
}
if (ImGui::TreeNode (g_deko3dVersion))
{
ImGui::TextWrapped (g_deko3dCopyright);
ImGui::Separator ();
ImGui::TextWrapped (g_zlibLicense);
ImGui::TreePop ();
}
if (ImGui::TreeNode (g_zstdVersion))
{
ImGui::TextWrapped (g_zstdCopyright);
ImGui::Separator ();
ImGui::TextWrapped (g_bsdLicense);
ImGui::TreePop ();
}
#else
if (ImGui::TreeNode (g_glfwVersion))
{
ImGui::TextWrapped (g_glfwCopyright);
ImGui::Separator ();
ImGui::TextWrapped (g_zlibLicense);
ImGui::TreePop ();
}
#endif
ImGui::EndPopup ();
}
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}
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#endif
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void FtpServer::loop ()
{
if (!m_socket)
{
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#ifdef __SWITCH__
if (!m_apError)
{
bool enable;
std::string ssid;
std::string passphrase;
{
auto const lock = m_config->lockGuard ();
enable = m_config->enableAP ();
ssid = m_config->ssid ();
passphrase = m_config->passphrase ();
}
m_apError = !platform::enableAP (enable, ssid, passphrase);
}
#endif
if (platform::networkVisible ())
handleNetworkFound ();
}
// poll listen socket
if (m_socket)
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{
Socket::PollInfo info{*m_socket, POLLIN, 0};
auto const rc = Socket::poll (&info, 1, 0ms);
if (rc < 0)
{
handleNetworkLost ();
return;
}
if (rc > 0 && (info.revents & POLLIN))
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{
auto socket = m_socket->accept ();
if (socket)
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{
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auto session = FtpSession::create (*m_config, std::move (socket));
LOCKED (m_sessions.emplace_back (std::move (session)));
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}
else
{
handleNetworkLost ();
return;
}
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}
}
{
std::vector<UniqueFtpSession> deadSessions;
{
// remove dead sessions
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#ifndef NDS
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auto const lock = std::lock_guard (m_lock);
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#endif
auto it = std::begin (m_sessions);
while (it != std::end (m_sessions))
{
auto &session = *it;
if (session->dead ())
{
deadSessions.emplace_back (std::move (session));
it = m_sessions.erase (it);
}
else
++it;
}
}
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}
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// poll sessions
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if (!m_sessions.empty ())
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{
if (!FtpSession::poll (m_sessions))
handleNetworkLost ();
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}
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#ifndef NDS
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// avoid busy polling in background thread
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else
platform::Thread::sleep (16ms);
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#endif
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}
void FtpServer::threadFunc ()
{
while (!m_quit)
loop ();
}