mirror of
https://github.com/mtheall/ftpd.git
synced 2024-11-23 09:39:43 +00:00
2869 lines
60 KiB
C++
2869 lines
60 KiB
C++
// 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 "ftpSession.h"
|
|
|
|
#include "ftpServer.h"
|
|
#include "log.h"
|
|
#include "platform.h"
|
|
|
|
#include "imgui.h"
|
|
|
|
#include <arpa/inet.h>
|
|
#include <sys/stat.h>
|
|
#include <unistd.h>
|
|
|
|
#include <algorithm>
|
|
#include <cerrno>
|
|
#include <chrono>
|
|
#include <cinttypes>
|
|
#include <cstdarg>
|
|
#include <cstring>
|
|
#include <ctime>
|
|
#include <mutex>
|
|
using namespace std::chrono_literals;
|
|
|
|
#if defined(NDS) || defined(_3DS) || defined(__SWITCH__)
|
|
#define lstat stat
|
|
#endif
|
|
|
|
#ifdef NDS
|
|
#define LOCKED(x) x
|
|
#else
|
|
#define LOCKED(x) \
|
|
do \
|
|
{ \
|
|
auto const lock = std::lock_guard (m_lock); \
|
|
x; \
|
|
} while (0)
|
|
#endif
|
|
|
|
namespace
|
|
{
|
|
/// \brief Parse command
|
|
/// \param buffer_ Buffer to parse
|
|
/// \param size_ Size of buffer
|
|
/// \returns {delimiterPos, nextPos}
|
|
std::pair<char *, char *> parseCommand (char *const buffer_, std::size_t const size_)
|
|
{
|
|
// look for \r\n or \n delimiter
|
|
auto const end = &buffer_[size_];
|
|
for (auto p = buffer_; p < end; ++p)
|
|
{
|
|
if (p[0] == '\r' && p < end - 1 && p[1] == '\n')
|
|
return {p, &p[2]};
|
|
|
|
if (p[0] == '\n')
|
|
return {p, &p[1]};
|
|
}
|
|
|
|
return {nullptr, nullptr};
|
|
}
|
|
|
|
/// \brief Decode path
|
|
/// \param buffer_ Buffer to decode
|
|
/// \param size_ Size of buffer
|
|
void decodePath (char *const buffer_, std::size_t const size_)
|
|
{
|
|
auto const end = &buffer_[size_];
|
|
for (auto p = buffer_; p < end; ++p)
|
|
{
|
|
// this is an encoded \n
|
|
if (*p == '\0')
|
|
*p = '\n';
|
|
}
|
|
}
|
|
|
|
/// \brief Encode path
|
|
/// \param buffer_ Buffer to encode
|
|
/// \param quotes_ Whether to encode quotes
|
|
std::string encodePath (std::string_view const buffer_, bool const quotes_ = false)
|
|
{
|
|
// check if the buffer has \n
|
|
bool const lf = std::memchr (buffer_.data (), '\n', buffer_.size ());
|
|
|
|
auto end = std::end (buffer_);
|
|
|
|
std::size_t numQuotes = 0;
|
|
if (quotes_)
|
|
{
|
|
// check for \" that needs to be encoded
|
|
auto p = buffer_.data ();
|
|
do
|
|
{
|
|
p = static_cast<char const *> (std::memchr (p, '"', end - p));
|
|
if (p)
|
|
{
|
|
++p;
|
|
++numQuotes;
|
|
}
|
|
} while (p);
|
|
}
|
|
|
|
// if nothing needs escaping, return it as-is
|
|
if (!lf && !numQuotes)
|
|
return std::string (buffer_);
|
|
|
|
// reserve output buffer
|
|
std::string path (buffer_.size () + numQuotes, '\0');
|
|
auto in = buffer_.data ();
|
|
auto out = path.data ();
|
|
|
|
// encode into the output buffer
|
|
while (in < end)
|
|
{
|
|
if (*in == '\n')
|
|
{
|
|
// encoded \n is \0
|
|
*out++ = '\0';
|
|
}
|
|
else if (quotes_ && *in == '"')
|
|
{
|
|
// encoded \" is \"\"
|
|
*out++ = '"';
|
|
*out++ = '"';
|
|
}
|
|
else
|
|
*out++ = *in;
|
|
++in;
|
|
}
|
|
|
|
return path;
|
|
}
|
|
|
|
/// \brief Get parent directory name of a path
|
|
/// \param path_ Path to get parent of
|
|
std::string dirName (std::string_view const path_)
|
|
{
|
|
// remove last path component
|
|
auto const dir = std::string (path_.substr (0, path_.rfind ('/')));
|
|
if (dir.empty ())
|
|
return "/";
|
|
|
|
return dir;
|
|
}
|
|
|
|
/// \brief Resolve path
|
|
/// \param path_ Path to resolve
|
|
std::string resolvePath (std::string_view const path_)
|
|
{
|
|
assert (!path_.empty ());
|
|
assert (path_[0] == '/');
|
|
|
|
// make sure parent is a directory
|
|
struct stat st;
|
|
if (::stat (dirName (path_).c_str (), &st) != 0)
|
|
return {};
|
|
|
|
if (!S_ISDIR (st.st_mode))
|
|
{
|
|
errno = ENOTDIR;
|
|
return {};
|
|
}
|
|
|
|
// split path components
|
|
std::vector<std::string_view> components;
|
|
|
|
std::size_t pos = 1;
|
|
auto next = path_.find ('/', pos);
|
|
while (next != std::string::npos)
|
|
{
|
|
if (next != pos)
|
|
components.emplace_back (path_.substr (pos, next - pos));
|
|
pos = next + 1;
|
|
next = path_.find ('/', pos);
|
|
}
|
|
|
|
if (pos != path_.size ())
|
|
components.emplace_back (path_.substr (pos));
|
|
|
|
// collapse . and ..
|
|
auto it = std::begin (components);
|
|
while (it != std::end (components))
|
|
{
|
|
if (*it == ".")
|
|
{
|
|
it = components.erase (it);
|
|
continue;
|
|
}
|
|
|
|
if (*it == "..")
|
|
{
|
|
if (it != std::begin (components))
|
|
it = components.erase (std::prev (it));
|
|
it = components.erase (it);
|
|
continue;
|
|
}
|
|
|
|
++it;
|
|
}
|
|
|
|
// join path components
|
|
std::string outPath = "/";
|
|
for (auto const &component : components)
|
|
{
|
|
outPath += component;
|
|
outPath.push_back ('/');
|
|
}
|
|
|
|
if (outPath.size () > 1)
|
|
outPath.pop_back ();
|
|
|
|
return outPath;
|
|
}
|
|
|
|
/// \brief Build path from a parent and child
|
|
/// \param cwd_ Parent directory
|
|
/// \param args_ Child component
|
|
std::string buildPath (std::string_view const cwd_, std::string_view const args_)
|
|
{
|
|
std::string path;
|
|
|
|
// absolute path
|
|
if (args_[0] == '/')
|
|
path = std::string (args_);
|
|
// relative path
|
|
else
|
|
path = std::string (cwd_) + '/' + std::string (args_);
|
|
|
|
// coalesce consecutive slashes
|
|
auto it = std::begin (path);
|
|
while (it != std::end (path))
|
|
{
|
|
if (it != std::begin (path) && *it == '/' && *std::prev (it) == '/')
|
|
it = path.erase (it);
|
|
else
|
|
++it;
|
|
}
|
|
|
|
return path;
|
|
}
|
|
|
|
/// \brief Build resolved path from a parent and child
|
|
/// \param cwd_ Parent directory
|
|
/// \param args_ Child component
|
|
std::string buildResolvedPath (std::string_view const cwd_, std::string_view const args_)
|
|
{
|
|
return resolvePath (buildPath (cwd_, args_));
|
|
}
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
FtpSession::~FtpSession ()
|
|
{
|
|
closeCommand ();
|
|
closePasv ();
|
|
closeData ();
|
|
}
|
|
|
|
FtpSession::FtpSession (FtpConfig &config_, UniqueSocket commandSocket_)
|
|
: m_config (config_),
|
|
m_commandSocket (std::move (commandSocket_)),
|
|
m_commandBuffer (COMMAND_BUFFERSIZE),
|
|
m_responseBuffer (RESPONSE_BUFFERSIZE),
|
|
m_xferBuffer (XFER_BUFFERSIZE),
|
|
m_authorizedUser (false),
|
|
m_authorizedPass (false),
|
|
m_pasv (false),
|
|
m_port (false),
|
|
m_recv (false),
|
|
m_send (false),
|
|
m_urgent (false),
|
|
m_mlstType (true),
|
|
m_mlstSize (true),
|
|
m_mlstModify (true),
|
|
m_mlstPerm (true),
|
|
m_mlstUnixMode (false),
|
|
m_devZero (false)
|
|
{
|
|
{
|
|
#ifndef NDS
|
|
auto const lock = m_config.lockGuard ();
|
|
#endif
|
|
if (m_config.user ().empty ())
|
|
m_authorizedUser = true;
|
|
if (m_config.pass ().empty ())
|
|
m_authorizedPass = true;
|
|
}
|
|
|
|
char buffer[32];
|
|
std::sprintf (buffer, "Session#%p", this);
|
|
m_windowName = buffer;
|
|
|
|
std::sprintf (buffer, "Plot#%p", this);
|
|
m_plotName = buffer;
|
|
|
|
m_commandSocket->setNonBlocking ();
|
|
|
|
sendResponse ("220 Hello!\r\n");
|
|
}
|
|
|
|
bool FtpSession::dead ()
|
|
{
|
|
#ifndef NDS
|
|
auto const lock = std::lock_guard (m_lock);
|
|
#endif
|
|
if (m_commandSocket || m_pasvSocket || m_dataSocket)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
void FtpSession::draw ()
|
|
{
|
|
#ifndef NDS
|
|
auto const lock = std::lock_guard (m_lock);
|
|
#endif
|
|
|
|
#ifdef CLASSIC
|
|
if (m_filePosition)
|
|
{
|
|
std::fputs (fs::printSize (m_filePosition).c_str (), stdout);
|
|
std::fputc (' ', stdout);
|
|
}
|
|
|
|
std::fputs (m_workItem.empty () ? m_cwd.c_str () : m_workItem.c_str (), stdout);
|
|
#else
|
|
#ifdef _3DS
|
|
ImGui::BeginChild (m_windowName.c_str (), ImVec2 (0.0f, 45.0f), true);
|
|
#else
|
|
ImGui::BeginChild (m_windowName.c_str (), ImVec2 (0.0f, 80.0f), true);
|
|
#endif
|
|
|
|
if (!m_workItem.empty ())
|
|
ImGui::TextUnformatted (m_workItem.c_str ());
|
|
else
|
|
ImGui::TextUnformatted (m_cwd.c_str ());
|
|
|
|
if (m_fileSize)
|
|
ImGui::Text (
|
|
"%s/%s", fs::printSize (m_filePosition).c_str (), fs::printSize (m_fileSize).c_str ());
|
|
else if (m_filePosition)
|
|
ImGui::Text ("%s/???", fs::printSize (m_filePosition).c_str ());
|
|
|
|
if (m_fileSize || m_filePosition)
|
|
{
|
|
// MiB/s plot lines
|
|
for (std::size_t i = 0; i < POSITION_HISTORY - 1; ++i)
|
|
{
|
|
m_filePositionDeltas[i] = m_filePositionHistory[i + 1] - m_filePositionHistory[i];
|
|
m_filePositionHistory[i] = m_filePositionHistory[i + 1];
|
|
}
|
|
|
|
auto const diff = m_filePosition - m_filePositionHistory[POSITION_HISTORY - 1];
|
|
m_filePositionDeltas[POSITION_HISTORY - 1] = diff;
|
|
m_filePositionHistory[POSITION_HISTORY - 1] = m_filePosition;
|
|
|
|
if (m_xferRate == -1.0f)
|
|
{
|
|
m_xferRate = 0.0f;
|
|
m_filePositionTime = platform::steady_clock::now ();
|
|
}
|
|
else
|
|
{
|
|
auto const now = platform::steady_clock::now ();
|
|
auto const timeDiff = now - m_filePositionTime;
|
|
m_filePositionTime = now;
|
|
|
|
auto const rate = diff / std::chrono::duration<float> (timeDiff).count ();
|
|
auto const alpha = 0.01f;
|
|
m_xferRate = alpha * rate + (1.0f - alpha) * m_xferRate;
|
|
}
|
|
|
|
auto const rateString = fs::printSize (m_xferRate) + "/s";
|
|
|
|
ImGui::SameLine ();
|
|
ImGui::PlotLines (
|
|
"", m_filePositionDeltas, IM_ARRAYSIZE (m_filePositionDeltas), 0, rateString.c_str ());
|
|
}
|
|
|
|
ImGui::EndChild ();
|
|
#endif
|
|
}
|
|
|
|
UniqueFtpSession FtpSession::create (FtpConfig &config_, UniqueSocket commandSocket_)
|
|
{
|
|
return UniqueFtpSession (new FtpSession (config_, std::move (commandSocket_)));
|
|
}
|
|
|
|
bool FtpSession::poll (std::vector<UniqueFtpSession> const &sessions_)
|
|
{
|
|
// poll for pending close sockets first
|
|
std::vector<Socket::PollInfo> pollInfo;
|
|
for (auto &session : sessions_)
|
|
{
|
|
for (auto &pending : session->m_pendingCloseSocket)
|
|
{
|
|
assert (pending.unique ());
|
|
pollInfo.emplace_back (Socket::PollInfo{*pending, POLLIN, 0});
|
|
}
|
|
}
|
|
|
|
if (!pollInfo.empty ())
|
|
{
|
|
auto const rc = Socket::poll (pollInfo.data (), pollInfo.size (), 0ms);
|
|
if (rc < 0)
|
|
{
|
|
error ("poll: %s\n", std::strerror (errno));
|
|
return false;
|
|
}
|
|
else
|
|
{
|
|
for (auto const &i : pollInfo)
|
|
{
|
|
if (!i.revents)
|
|
continue;
|
|
|
|
for (auto &session : sessions_)
|
|
{
|
|
for (auto it = std::begin (session->m_pendingCloseSocket);
|
|
it != std::end (session->m_pendingCloseSocket);)
|
|
{
|
|
auto &socket = *it;
|
|
if (&i.socket.get () != socket.get ())
|
|
{
|
|
++it;
|
|
continue;
|
|
}
|
|
|
|
it = session->m_pendingCloseSocket.erase (it);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// poll for everything else
|
|
pollInfo.clear ();
|
|
for (auto &session : sessions_)
|
|
{
|
|
if (session->m_commandSocket)
|
|
{
|
|
pollInfo.emplace_back (
|
|
Socket::PollInfo{*session->m_commandSocket, POLLIN | POLLPRI, 0});
|
|
if (session->m_responseBuffer.usedSize () != 0)
|
|
pollInfo.back ().events |= POLLOUT;
|
|
}
|
|
|
|
switch (session->m_state)
|
|
{
|
|
case State::COMMAND:
|
|
// we are waiting to read a command
|
|
break;
|
|
|
|
case State::DATA_CONNECT:
|
|
if (session->m_pasv)
|
|
{
|
|
assert (!session->m_port);
|
|
// we are waiting for a PASV connection
|
|
pollInfo.emplace_back (Socket::PollInfo{*session->m_pasvSocket, POLLIN, 0});
|
|
}
|
|
else
|
|
{
|
|
// we are waiting to complete a PORT connection
|
|
pollInfo.emplace_back (Socket::PollInfo{*session->m_dataSocket, POLLOUT, 0});
|
|
}
|
|
break;
|
|
|
|
case State::DATA_TRANSFER:
|
|
// we need to transfer data
|
|
if (session->m_recv)
|
|
{
|
|
assert (!session->m_send);
|
|
pollInfo.emplace_back (Socket::PollInfo{*session->m_dataSocket, POLLIN, 0});
|
|
}
|
|
else
|
|
{
|
|
assert (session->m_send);
|
|
pollInfo.emplace_back (Socket::PollInfo{*session->m_dataSocket, POLLOUT, 0});
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (pollInfo.empty ())
|
|
return true;
|
|
|
|
// poll for activity
|
|
auto const rc = Socket::poll (pollInfo.data (), pollInfo.size (), 100ms);
|
|
if (rc < 0)
|
|
{
|
|
error ("poll: %s\n", std::strerror (errno));
|
|
return false;
|
|
}
|
|
|
|
if (rc == 0)
|
|
return true;
|
|
|
|
for (auto &session : sessions_)
|
|
{
|
|
for (auto const &i : pollInfo)
|
|
{
|
|
if (!i.revents)
|
|
continue;
|
|
|
|
// check command socket
|
|
if (&i.socket.get () == session->m_commandSocket.get ())
|
|
{
|
|
if (i.revents & ~(POLLIN | POLLPRI | POLLOUT))
|
|
debug ("Command revents 0x%X\n", i.revents);
|
|
|
|
if (!session->m_dataSocket && (i.revents & POLLOUT))
|
|
session->writeResponse ();
|
|
|
|
if (i.revents & (POLLIN | POLLPRI))
|
|
session->readCommand (i.revents);
|
|
|
|
if (i.revents & (POLLERR | POLLHUP))
|
|
session->closeCommand ();
|
|
}
|
|
|
|
// check the data socket
|
|
if (&i.socket.get () == session->m_pasvSocket.get () ||
|
|
&i.socket.get () == session->m_dataSocket.get ())
|
|
{
|
|
switch (session->m_state)
|
|
{
|
|
case State::COMMAND:
|
|
std::abort ();
|
|
break;
|
|
|
|
case State::DATA_CONNECT:
|
|
if (i.revents & ~(POLLIN | POLLPRI | POLLOUT))
|
|
debug ("Data revents 0x%X\n", i.revents);
|
|
|
|
if (i.revents & (POLLERR | POLLHUP))
|
|
{
|
|
session->sendResponse ("426 Data connection failed\r\n");
|
|
session->setState (State::COMMAND, true, true);
|
|
}
|
|
else if (i.revents & POLLIN)
|
|
{
|
|
// we need to accept the PASV connection
|
|
session->dataAccept ();
|
|
}
|
|
else if (i.revents & POLLOUT)
|
|
{
|
|
// PORT connection completed
|
|
auto const &sockName = session->m_dataSocket->peerName ();
|
|
info ("Connected to [%s]:%u\n", sockName.name (), sockName.port ());
|
|
|
|
session->sendResponse ("150 Ready\r\n");
|
|
session->setState (State::DATA_TRANSFER, true, false);
|
|
}
|
|
break;
|
|
|
|
case State::DATA_TRANSFER:
|
|
if (i.revents & ~(POLLIN | POLLPRI | POLLOUT))
|
|
debug ("Data revents 0x%X\n", i.revents);
|
|
|
|
// we need to transfer data
|
|
if (i.revents & (POLLERR | POLLHUP))
|
|
{
|
|
session->sendResponse ("426 Data connection failed\r\n");
|
|
session->setState (State::COMMAND, true, true);
|
|
}
|
|
else if (i.revents & (POLLIN | POLLOUT))
|
|
{
|
|
for (unsigned i = 0; i < 10; ++i)
|
|
{
|
|
if (!((*session).*(session->m_transfer)) ())
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool FtpSession::authorized () const
|
|
{
|
|
return m_authorizedUser && m_authorizedPass;
|
|
}
|
|
|
|
void FtpSession::setState (State const state_, bool const closePasv_, bool const closeData_)
|
|
{
|
|
m_state = state_;
|
|
|
|
if (closePasv_)
|
|
closePasv ();
|
|
if (closeData_)
|
|
closeData ();
|
|
|
|
if (state_ == State::COMMAND)
|
|
{
|
|
{
|
|
#ifndef NDS
|
|
auto lock = std::lock_guard (m_lock);
|
|
#endif
|
|
|
|
m_restartPosition = 0;
|
|
m_fileSize = 0;
|
|
m_filePosition = 0;
|
|
|
|
for (auto &pos : m_filePositionHistory)
|
|
pos = 0;
|
|
m_xferRate = -1.0f;
|
|
|
|
m_workItem.clear ();
|
|
}
|
|
|
|
m_devZero = false;
|
|
m_file.close ();
|
|
m_dir.close ();
|
|
}
|
|
}
|
|
|
|
void FtpSession::closeSocket (SharedSocket &socket_)
|
|
{
|
|
if (socket_ && socket_.unique ())
|
|
{
|
|
socket_->shutdown (SHUT_WR);
|
|
socket_->setLinger (true, 0s);
|
|
LOCKED (m_pendingCloseSocket.emplace_back (std::move (socket_)));
|
|
}
|
|
else
|
|
LOCKED (socket_.reset ());
|
|
}
|
|
|
|
void FtpSession::closeCommand ()
|
|
{
|
|
closeSocket (m_commandSocket);
|
|
}
|
|
|
|
void FtpSession::closePasv ()
|
|
{
|
|
UniqueSocket pasv;
|
|
LOCKED (pasv = std::move (m_pasvSocket));
|
|
}
|
|
|
|
void FtpSession::closeData ()
|
|
{
|
|
closeSocket (m_dataSocket);
|
|
|
|
m_recv = false;
|
|
m_send = false;
|
|
}
|
|
|
|
bool FtpSession::changeDir (char const *const args_)
|
|
{
|
|
if (std::strcmp (args_, "..") == 0)
|
|
{
|
|
// cd up
|
|
auto const pos = m_cwd.find_last_of ('/');
|
|
assert (pos != std::string::npos);
|
|
if (pos == 0)
|
|
LOCKED (m_cwd = "/");
|
|
else
|
|
LOCKED (m_cwd = m_cwd.substr (0, pos));
|
|
return true;
|
|
}
|
|
|
|
auto const path = buildResolvedPath (m_cwd, args_);
|
|
if (path.empty ())
|
|
return false;
|
|
|
|
struct stat st;
|
|
if (::stat (path.c_str (), &st) != 0)
|
|
return false;
|
|
|
|
if (!S_ISDIR (st.st_mode))
|
|
{
|
|
errno = ENOTDIR;
|
|
return false;
|
|
}
|
|
|
|
LOCKED (m_cwd = path);
|
|
return true;
|
|
}
|
|
|
|
bool FtpSession::dataAccept ()
|
|
{
|
|
if (!m_pasv)
|
|
{
|
|
sendResponse ("503 Bad sequence of commands\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
m_pasv = false;
|
|
|
|
auto peer = m_pasvSocket->accept ();
|
|
LOCKED (m_dataSocket = std::move (peer));
|
|
if (!m_dataSocket)
|
|
{
|
|
sendResponse ("425 Failed to establish connection\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
#ifndef _3DS
|
|
m_dataSocket->setRecvBufferSize (SOCK_BUFFERSIZE);
|
|
m_dataSocket->setSendBufferSize (SOCK_BUFFERSIZE);
|
|
#endif
|
|
|
|
if (!m_dataSocket->setNonBlocking ())
|
|
{
|
|
sendResponse ("425 Failed to establish connection\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
// we are ready to transfer data
|
|
sendResponse ("150 Ready\r\n");
|
|
setState (State::DATA_TRANSFER, true, false);
|
|
return true;
|
|
}
|
|
|
|
bool FtpSession::dataConnect ()
|
|
{
|
|
assert (m_port);
|
|
|
|
m_port = false;
|
|
|
|
auto data = Socket::create ();
|
|
LOCKED (m_dataSocket = std::move (data));
|
|
if (!m_dataSocket)
|
|
return false;
|
|
|
|
m_dataSocket->setRecvBufferSize (SOCK_BUFFERSIZE);
|
|
m_dataSocket->setSendBufferSize (SOCK_BUFFERSIZE);
|
|
|
|
if (!m_dataSocket->setNonBlocking ())
|
|
return false;
|
|
|
|
if (!m_dataSocket->connect (m_portAddr))
|
|
{
|
|
if (errno != EINPROGRESS)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
// we are ready to transfer data
|
|
sendResponse ("150 Ready\r\n");
|
|
setState (State::DATA_TRANSFER, true, false);
|
|
return true;
|
|
}
|
|
|
|
int FtpSession::fillDirent (struct stat const &st_, std::string_view const path_, char const *type_)
|
|
{
|
|
auto const buffer = m_xferBuffer.freeArea ();
|
|
auto const size = m_xferBuffer.freeSize ();
|
|
|
|
std::size_t pos = 0;
|
|
|
|
if (m_xferDirMode == XferDirMode::MLSD || m_xferDirMode == XferDirMode::MLST)
|
|
{
|
|
if (m_xferDirMode == XferDirMode::MLST)
|
|
{
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = ' ';
|
|
}
|
|
|
|
// type fact
|
|
if (m_mlstType)
|
|
{
|
|
if (!type_)
|
|
{
|
|
type_ = "???";
|
|
if (S_ISREG (st_.st_mode))
|
|
type_ = "file";
|
|
else if (S_ISDIR (st_.st_mode))
|
|
type_ = "dir";
|
|
#if !defined(_3DS) && !defined(__SWITCH__)
|
|
else if (S_ISLNK (st_.st_mode))
|
|
type_ = "os.unix=symlink";
|
|
else if (S_ISCHR (st_.st_mode))
|
|
type_ = "os.unix=character";
|
|
else if (S_ISBLK (st_.st_mode))
|
|
type_ = "os.unix=block";
|
|
else if (S_ISFIFO (st_.st_mode))
|
|
type_ = "os.unix=fifo";
|
|
else if (S_ISSOCK (st_.st_mode))
|
|
type_ = "os.unix=socket";
|
|
#endif
|
|
}
|
|
|
|
auto const rc = std::snprintf (&buffer[pos], size - pos, "Type=%s;", type_);
|
|
if (rc < 0)
|
|
return errno;
|
|
if (static_cast<std::size_t> (rc) > size - pos)
|
|
return EAGAIN;
|
|
|
|
pos += rc;
|
|
}
|
|
|
|
// size fact
|
|
if (m_mlstSize)
|
|
{
|
|
auto const rc = std::snprintf (&buffer[pos],
|
|
size - pos,
|
|
"Size=%llu;",
|
|
static_cast<unsigned long long> (st_.st_size));
|
|
if (rc < 0)
|
|
return errno;
|
|
if (static_cast<std::size_t> (rc) > size - pos)
|
|
return EAGAIN;
|
|
|
|
pos += rc;
|
|
}
|
|
|
|
// mtime fact
|
|
if (m_mlstModify)
|
|
{
|
|
auto const tm = std::gmtime (&st_.st_mtime);
|
|
if (!tm)
|
|
return errno;
|
|
|
|
auto const rc = std::strftime (&buffer[pos], size - pos, "Modify=%Y%m%d%H%M%S;", tm);
|
|
if (rc == 0)
|
|
return EAGAIN;
|
|
|
|
pos += rc;
|
|
}
|
|
|
|
// permission fact
|
|
if (m_mlstPerm)
|
|
{
|
|
auto const header = "Perm=";
|
|
if (size - pos < std::strlen (header))
|
|
return EAGAIN;
|
|
|
|
std::strcpy (&buffer[pos], header);
|
|
pos += std::strlen (header);
|
|
|
|
// append permission
|
|
if (S_ISREG (st_.st_mode) && (st_.st_mode & S_IWUSR))
|
|
{
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = 'a';
|
|
}
|
|
|
|
// create permission
|
|
if (S_ISDIR (st_.st_mode) && (st_.st_mode & S_IWUSR))
|
|
{
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = 'c';
|
|
}
|
|
|
|
// delete permission
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = 'd';
|
|
|
|
// chdir permission
|
|
if (S_ISDIR (st_.st_mode) && (st_.st_mode & S_IXUSR))
|
|
{
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = 'e';
|
|
}
|
|
|
|
// rename permission
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = 'f';
|
|
|
|
// list permission
|
|
if (S_ISDIR (st_.st_mode) && (st_.st_mode & S_IRUSR))
|
|
{
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = 'l';
|
|
}
|
|
|
|
// mkdir permission
|
|
if (S_ISDIR (st_.st_mode) && (st_.st_mode & S_IWUSR))
|
|
{
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = 'm';
|
|
}
|
|
|
|
// purge permission
|
|
if (S_ISDIR (st_.st_mode) && (st_.st_mode & S_IWUSR))
|
|
{
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = 'p';
|
|
}
|
|
|
|
// read permission
|
|
if (S_ISREG (st_.st_mode) && (st_.st_mode & S_IRUSR))
|
|
{
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = 'r';
|
|
}
|
|
|
|
// write permission
|
|
if (S_ISREG (st_.st_mode) && (st_.st_mode & S_IWUSR))
|
|
{
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = 'w';
|
|
}
|
|
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
buffer[pos++] = ';';
|
|
}
|
|
|
|
// unix mode fact
|
|
if (m_mlstUnixMode)
|
|
{
|
|
auto const mask = S_IRWXU | S_IRWXG | S_IRWXO | S_ISVTX | S_ISGID | S_ISUID;
|
|
|
|
auto const rc = std::snprintf (&buffer[pos],
|
|
size - pos,
|
|
"UNIX.mode=0%lo;",
|
|
static_cast<unsigned long> (st_.st_mode & mask));
|
|
if (rc < 0)
|
|
return errno;
|
|
if (static_cast<std::size_t> (rc) > size - pos)
|
|
return EAGAIN;
|
|
|
|
pos += rc;
|
|
}
|
|
|
|
// make sure space precedes name
|
|
if (buffer[pos - 1] != ' ')
|
|
{
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
|
|
buffer[pos++] = ' ';
|
|
}
|
|
}
|
|
else if (m_xferDirMode != XferDirMode::NLST)
|
|
{
|
|
if (m_xferDirMode == XferDirMode::STAT)
|
|
{
|
|
if (pos >= size)
|
|
return EAGAIN;
|
|
|
|
buffer[pos++] = ' ';
|
|
}
|
|
|
|
#ifdef _3DS
|
|
auto const owner = "3DS";
|
|
auto const group = "3DS";
|
|
#elif defined(__SWITCH__)
|
|
auto const owner = "Switch";
|
|
auto const group = "Switch";
|
|
#else
|
|
char owner[32];
|
|
char group[32];
|
|
std::sprintf (owner, "%d", st_.st_uid);
|
|
std::sprintf (group, "%d", st_.st_gid);
|
|
#endif
|
|
// perms nlinks owner group size
|
|
auto rc = std::snprintf (&buffer[pos],
|
|
size - pos,
|
|
"%c%c%c%c%c%c%c%c%c%c %lu %s %s %llu ",
|
|
// clang-format off
|
|
S_ISREG (st_.st_mode) ? '-' :
|
|
S_ISDIR (st_.st_mode) ? 'd' :
|
|
#if !defined(_3DS) && !defined(__SWITCH__)
|
|
S_ISLNK (st_.st_mode) ? 'l' :
|
|
S_ISCHR (st_.st_mode) ? 'c' :
|
|
S_ISBLK (st_.st_mode) ? 'b' :
|
|
S_ISFIFO (st_.st_mode) ? 'p' :
|
|
S_ISSOCK (st_.st_mode) ? 's' :
|
|
#endif
|
|
'?',
|
|
// clang-format on
|
|
st_.st_mode & S_IRUSR ? 'r' : '-',
|
|
st_.st_mode & S_IWUSR ? 'w' : '-',
|
|
st_.st_mode & S_IXUSR ? 'x' : '-',
|
|
st_.st_mode & S_IRGRP ? 'r' : '-',
|
|
st_.st_mode & S_IWGRP ? 'w' : '-',
|
|
st_.st_mode & S_IXGRP ? 'x' : '-',
|
|
st_.st_mode & S_IROTH ? 'r' : '-',
|
|
st_.st_mode & S_IWOTH ? 'w' : '-',
|
|
st_.st_mode & S_IXOTH ? 'x' : '-',
|
|
static_cast<unsigned long> (st_.st_nlink),
|
|
owner,
|
|
group,
|
|
static_cast<unsigned long long> (st_.st_size));
|
|
if (rc < 0)
|
|
return errno;
|
|
|
|
if (static_cast<std::size_t> (rc) > size - pos)
|
|
return EAGAIN;
|
|
|
|
pos += rc;
|
|
|
|
// timestamp
|
|
auto const tm = std::gmtime (&st_.st_mtime);
|
|
if (!tm)
|
|
return errno;
|
|
|
|
auto fmt = "%b %e %Y ";
|
|
if (m_timestamp > st_.st_mtime && m_timestamp - st_.st_mtime < (60 * 60 * 24 * 365 / 2))
|
|
fmt = "%b %e %H:%M ";
|
|
rc = std::strftime (&buffer[pos], size - pos, fmt, tm);
|
|
if (rc < 0)
|
|
return errno;
|
|
if (static_cast<std::size_t> (rc) > size - pos)
|
|
return EAGAIN;
|
|
|
|
pos += rc;
|
|
}
|
|
|
|
if (size - pos < path_.size () + 2)
|
|
return EAGAIN;
|
|
|
|
// path
|
|
std::memcpy (&buffer[pos], path_.data (), path_.size ());
|
|
pos += path_.size ();
|
|
buffer[pos++] = '\r';
|
|
buffer[pos++] = '\n';
|
|
|
|
m_xferBuffer.markUsed (pos);
|
|
LOCKED (m_filePosition += pos);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int FtpSession::fillDirent (std::string const &path_, char const *type_)
|
|
{
|
|
struct stat st;
|
|
if (::stat (path_.c_str (), &st) != 0)
|
|
return errno;
|
|
|
|
return fillDirent (st, encodePath (path_), type_);
|
|
}
|
|
|
|
void FtpSession::xferFile (char const *const args_, XferFileMode const mode_)
|
|
{
|
|
m_xferBuffer.clear ();
|
|
|
|
// build the path of the file to transfer
|
|
auto const path = buildResolvedPath (m_cwd, args_);
|
|
if (path.empty ())
|
|
{
|
|
sendResponse ("553 %s\r\n", std::strerror (errno));
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
|
|
if (path == "/devZero")
|
|
{
|
|
m_devZero = true;
|
|
}
|
|
else if (mode_ == XferFileMode::RETR)
|
|
{
|
|
// stat the file
|
|
struct stat st;
|
|
if (::stat (path.c_str (), &st) != 0)
|
|
{
|
|
sendResponse ("450 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
// open the file in read mode
|
|
if (!m_file.open (path.c_str (), "rb"))
|
|
{
|
|
sendResponse ("450 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
LOCKED (m_fileSize = st.st_size);
|
|
|
|
m_file.setBufferSize (FILE_BUFFERSIZE);
|
|
|
|
if (m_restartPosition != 0)
|
|
{
|
|
if (m_file.seek (m_restartPosition, SEEK_SET) != 0)
|
|
{
|
|
sendResponse ("450 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
}
|
|
|
|
LOCKED (m_filePosition = m_restartPosition);
|
|
}
|
|
else
|
|
{
|
|
auto const append = mode_ == XferFileMode::APPE;
|
|
|
|
char const *mode = "wb";
|
|
if (append)
|
|
mode = "ab";
|
|
else if (m_restartPosition != 0)
|
|
mode = "r+b";
|
|
|
|
// open file in write mode
|
|
if (!m_file.open (path.c_str (), mode))
|
|
{
|
|
sendResponse ("450 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
FtpServer::updateFreeSpace ();
|
|
|
|
m_file.setBufferSize (FILE_BUFFERSIZE);
|
|
|
|
// check if this had REST but not APPE
|
|
if (m_restartPosition != 0 && !append)
|
|
{
|
|
// seek to the REST offset
|
|
if (m_file.seek (m_restartPosition, SEEK_SET) != 0)
|
|
{
|
|
sendResponse ("450 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
}
|
|
|
|
LOCKED (m_filePosition = m_restartPosition);
|
|
}
|
|
|
|
if (!m_port && !m_pasv)
|
|
{
|
|
sendResponse ("503 Bad sequence of commands\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
|
|
setState (State::DATA_CONNECT, false, true);
|
|
|
|
// setup connection
|
|
if (m_port && !dataConnect ())
|
|
{
|
|
sendResponse ("425 Can't open data connection\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
|
|
// set up the transfer
|
|
if (mode_ == XferFileMode::RETR)
|
|
{
|
|
m_recv = false;
|
|
m_send = true;
|
|
m_transfer = &FtpSession::retrieveTransfer;
|
|
}
|
|
else
|
|
{
|
|
m_recv = true;
|
|
m_send = false;
|
|
m_transfer = &FtpSession::storeTransfer;
|
|
}
|
|
|
|
LOCKED (m_workItem = path);
|
|
}
|
|
|
|
void FtpSession::xferDir (char const *const args_, XferDirMode const mode_, bool const workaround_)
|
|
{
|
|
// set up the transfer
|
|
m_xferDirMode = mode_;
|
|
m_recv = false;
|
|
m_send = true;
|
|
|
|
m_filePosition = 0;
|
|
m_xferBuffer.clear ();
|
|
|
|
m_transfer = &FtpSession::listTransfer;
|
|
|
|
if (std::strlen (args_) > 0)
|
|
{
|
|
// an argument was provided
|
|
auto const path = buildResolvedPath (m_cwd, args_);
|
|
if (path.empty ())
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
|
|
struct stat st;
|
|
if (::stat (path.c_str (), &st) != 0)
|
|
{
|
|
auto const rc = errno;
|
|
|
|
// work around broken clients that think LIST -a/-l is valid
|
|
if (workaround_ && mode_ == XferDirMode::LIST)
|
|
{
|
|
if (args_[0] == '-' && (args_[1] == 'a' || args_[1] == 'l'))
|
|
{
|
|
char const *args = &args_[2];
|
|
if (*args == '\0' || *args == ' ')
|
|
{
|
|
if (*args == ' ')
|
|
++args;
|
|
|
|
xferDir (args, mode_, false);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
sendResponse ("550 %s\r\n", std::strerror (rc));
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
|
|
if (S_ISDIR (st.st_mode))
|
|
{
|
|
if (!m_dir.open (path.c_str ()))
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
|
|
// set as lwd
|
|
m_lwd = std::move (path);
|
|
|
|
if (mode_ == XferDirMode::MLSD && m_mlstType)
|
|
{
|
|
// send this directory as type=cdir
|
|
auto const rc = fillDirent (m_lwd, "cdir");
|
|
if (rc != 0)
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (rc));
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
}
|
|
|
|
LOCKED (m_workItem = m_lwd);
|
|
}
|
|
else if (mode_ == XferDirMode::MLSD)
|
|
{
|
|
// specified file instead of directory for MLSD
|
|
sendResponse ("501 %s\r\n", std::strerror (ENOTDIR));
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
std::string name;
|
|
if (mode_ == XferDirMode::NLST)
|
|
{
|
|
// NLST uses full path name
|
|
name = encodePath (path);
|
|
}
|
|
else
|
|
{
|
|
// everything else uses basename
|
|
auto const pos = path.find_last_of ('/');
|
|
assert (pos != std::string::npos);
|
|
name = encodePath (std::string_view (path).substr (pos + 1));
|
|
}
|
|
|
|
auto const rc = fillDirent (st, name);
|
|
if (rc != 0)
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (rc));
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
|
|
LOCKED (m_workItem = path);
|
|
}
|
|
}
|
|
else if (!m_dir.open (m_cwd.c_str ()))
|
|
{
|
|
// no argument, but opening cwd failed
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
else
|
|
{
|
|
// set the cwd as the lwd
|
|
m_lwd = m_cwd;
|
|
|
|
if (mode_ == XferDirMode::MLSD && m_mlstType)
|
|
{
|
|
// send this directory as type=cdir
|
|
auto const rc = fillDirent (m_lwd, "cdir");
|
|
if (rc != 0)
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (rc));
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
}
|
|
|
|
LOCKED (m_workItem = m_lwd);
|
|
}
|
|
|
|
if (mode_ == XferDirMode::MLST || mode_ == XferDirMode::STAT)
|
|
{
|
|
// this is a little different; we have to send the data over the command socket
|
|
sendResponse ("213-Status\r\n");
|
|
setState (State::DATA_TRANSFER, true, true);
|
|
LOCKED (m_dataSocket = m_commandSocket);
|
|
m_send = true;
|
|
return;
|
|
}
|
|
|
|
if (!m_port && !m_pasv)
|
|
{
|
|
// Prior PORT or PASV required
|
|
sendResponse ("503 Bad sequence of commands\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
return;
|
|
}
|
|
|
|
setState (State::DATA_CONNECT, false, true);
|
|
m_send = true;
|
|
|
|
// setup connection
|
|
if (m_port && !dataConnect ())
|
|
{
|
|
sendResponse ("425 Can't open data connection\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
}
|
|
}
|
|
|
|
void FtpSession::readCommand (int const events_)
|
|
{
|
|
#ifndef NDS
|
|
// check out-of-band data
|
|
if (events_ & POLLPRI)
|
|
{
|
|
m_urgent = true;
|
|
|
|
// check if we are at the urgent marker
|
|
auto const atMark = m_commandSocket->atMark ();
|
|
if (atMark < 0)
|
|
{
|
|
closeCommand ();
|
|
return;
|
|
}
|
|
|
|
if (!atMark)
|
|
{
|
|
// discard in-band data
|
|
m_commandBuffer.clear ();
|
|
auto const rc = m_commandSocket->read (m_commandBuffer);
|
|
if (rc < 0 && errno != EWOULDBLOCK)
|
|
closeCommand ();
|
|
|
|
return;
|
|
}
|
|
|
|
// retrieve the urgent data
|
|
m_commandBuffer.clear ();
|
|
auto const rc = m_commandSocket->read (m_commandBuffer, true);
|
|
if (rc < 0)
|
|
{
|
|
// EWOULDBLOCK means out-of-band data is on the way
|
|
if (errno != EWOULDBLOCK)
|
|
closeCommand ();
|
|
return;
|
|
}
|
|
|
|
// reset the command buffer
|
|
m_commandBuffer.clear ();
|
|
return;
|
|
}
|
|
#endif
|
|
|
|
if (events_ & POLLIN)
|
|
{
|
|
// prepare to receive data
|
|
if (m_commandBuffer.freeSize () == 0)
|
|
{
|
|
error ("Exceeded command buffer size\n");
|
|
closeCommand ();
|
|
return;
|
|
}
|
|
|
|
auto const rc = m_commandSocket->read (m_commandBuffer);
|
|
if (rc < 0)
|
|
{
|
|
closeCommand ();
|
|
return;
|
|
}
|
|
|
|
if (rc == 0)
|
|
{
|
|
// peer closed connection
|
|
info ("Peer closed connection\n");
|
|
closeCommand ();
|
|
return;
|
|
}
|
|
|
|
if (m_urgent)
|
|
{
|
|
// look for telnet data mark
|
|
auto const buffer = m_commandBuffer.usedArea ();
|
|
auto const size = m_commandBuffer.usedSize ();
|
|
auto const mark = static_cast<char const *> (std::memchr (buffer, 0xF2, size));
|
|
if (!mark)
|
|
return;
|
|
|
|
// ignore all data that precedes the data mark
|
|
m_commandBuffer.markFree (mark + 1 - buffer);
|
|
m_commandBuffer.coalesce ();
|
|
m_urgent = false;
|
|
}
|
|
}
|
|
|
|
// loop through commands
|
|
while (true)
|
|
{
|
|
// must have at least enough data for the delimiter
|
|
auto const size = m_commandBuffer.usedSize ();
|
|
if (size < 1)
|
|
return;
|
|
|
|
auto const buffer = m_commandBuffer.usedArea ();
|
|
auto const [delim, next] = parseCommand (buffer, size);
|
|
if (!next)
|
|
return;
|
|
|
|
*delim = '\0';
|
|
decodePath (buffer, delim - buffer);
|
|
if (::strncasecmp ("USER ", buffer, 5) == 0 || ::strncasecmp ("PASS ", buffer, 5) == 0)
|
|
command ("%.*s ******\n", 5, buffer);
|
|
else
|
|
command ("%s\n", buffer);
|
|
|
|
char const *const command = buffer;
|
|
|
|
char *args = buffer;
|
|
while (*args && !std::isspace (*args))
|
|
++args;
|
|
if (*args)
|
|
*args++ = 0;
|
|
|
|
auto const it = std::lower_bound (std::begin (handlers),
|
|
std::end (handlers),
|
|
command,
|
|
[] (auto const &lhs_, auto const &rhs_) {
|
|
return ::strcasecmp (lhs_.first.data (), rhs_) < 0;
|
|
});
|
|
|
|
m_timestamp = std::time (nullptr);
|
|
if (it == std::end (handlers) || ::strcasecmp (it->first.data (), command) != 0)
|
|
{
|
|
std::string response = "502 Invalid command \"";
|
|
response += encodePath (command);
|
|
|
|
if (*args)
|
|
{
|
|
response.push_back (' ');
|
|
response += encodePath (args);
|
|
}
|
|
|
|
response += "\"\r\n";
|
|
|
|
sendResponse (response);
|
|
}
|
|
else if (m_state != State::COMMAND)
|
|
{
|
|
// only some commands are available during data transfer
|
|
if (::strcasecmp (command, "ABOR") != 0 && ::strcasecmp (command, "NOOP") != 0 &&
|
|
::strcasecmp (command, "PWD") != 0 && ::strcasecmp (command, "QUIT") != 0 &&
|
|
::strcasecmp (command, "STAT") != 0 && ::strcasecmp (command, "XPWD") != 0)
|
|
{
|
|
sendResponse ("503 Invalid command during transfer\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
closeCommand ();
|
|
}
|
|
else
|
|
{
|
|
auto const handler = it->second;
|
|
(this->*handler) (args);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
// clear rename for all commands except RNTO
|
|
if (::strcasecmp (command, "RNTO") != 0)
|
|
m_rename.clear ();
|
|
|
|
auto const handler = it->second;
|
|
(this->*handler) (args);
|
|
}
|
|
|
|
m_commandBuffer.markFree (next - buffer);
|
|
m_commandBuffer.coalesce ();
|
|
}
|
|
}
|
|
|
|
void FtpSession::writeResponse ()
|
|
{
|
|
auto const rc = m_commandSocket->write (m_responseBuffer);
|
|
if (rc <= 0)
|
|
{
|
|
closeCommand ();
|
|
return;
|
|
}
|
|
|
|
m_responseBuffer.coalesce ();
|
|
}
|
|
|
|
void FtpSession::sendResponse (char const *fmt_, ...)
|
|
{
|
|
if (!m_commandSocket)
|
|
return;
|
|
|
|
auto const buffer = m_responseBuffer.freeArea ();
|
|
auto const size = m_responseBuffer.freeSize ();
|
|
|
|
va_list ap;
|
|
|
|
va_start (ap, fmt_);
|
|
addLog (RESPONSE, fmt_, ap);
|
|
va_end (ap);
|
|
|
|
va_start (ap, fmt_);
|
|
auto const rc = std::vsnprintf (buffer, size, fmt_, ap);
|
|
va_end (ap);
|
|
|
|
if (rc < 0)
|
|
{
|
|
error ("vsnprintf: %s\n", std::strerror (errno));
|
|
closeCommand ();
|
|
return;
|
|
}
|
|
|
|
if (static_cast<std::size_t> (rc) > size)
|
|
{
|
|
error ("Not enough space for response\n");
|
|
closeCommand ();
|
|
return;
|
|
}
|
|
|
|
m_responseBuffer.markUsed (rc);
|
|
|
|
// try to write data immediately
|
|
assert (m_commandSocket);
|
|
auto const bytes = m_commandSocket->write (m_responseBuffer);
|
|
if (bytes <= 0)
|
|
{
|
|
if (bytes == 0 || errno != EWOULDBLOCK)
|
|
closeCommand ();
|
|
}
|
|
else
|
|
m_responseBuffer.coalesce ();
|
|
}
|
|
|
|
void FtpSession::sendResponse (std::string_view const response_)
|
|
{
|
|
if (!m_commandSocket)
|
|
return;
|
|
|
|
addLog (RESPONSE, response_);
|
|
|
|
auto const buffer = m_responseBuffer.freeArea ();
|
|
auto const size = m_responseBuffer.freeSize ();
|
|
|
|
if (response_.size () > size)
|
|
{
|
|
error ("Not enough space for response\n");
|
|
closeCommand ();
|
|
return;
|
|
}
|
|
|
|
std::memcpy (buffer, response_.data (), response_.size ());
|
|
m_responseBuffer.markUsed (response_.size ());
|
|
}
|
|
|
|
bool FtpSession::listTransfer ()
|
|
{
|
|
// check if we sent all available data
|
|
if (m_xferBuffer.empty ())
|
|
{
|
|
m_xferBuffer.clear ();
|
|
|
|
// check xfer dir type
|
|
int rc = 226;
|
|
if (m_xferDirMode == XferDirMode::STAT)
|
|
rc = 213;
|
|
|
|
// check if this was for a file
|
|
if (!m_dir)
|
|
{
|
|
// we already sent the file's listing
|
|
sendResponse ("%d OK\r\n", rc);
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
// get the next directory entry
|
|
auto const dent = m_dir.read ();
|
|
if (!dent)
|
|
{
|
|
// we have exhausted the directory listing
|
|
sendResponse ("%d OK\r\n", rc);
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
// I think we are supposed to return entries for . and ..
|
|
if (std::strcmp (dent->d_name, ".") == 0 || std::strcmp (dent->d_name, "..") == 0)
|
|
return true;
|
|
|
|
// check if this was NLST
|
|
if (m_xferDirMode == XferDirMode::NLST)
|
|
{
|
|
// NLST gives the whole path name
|
|
auto const path = encodePath (buildPath (m_lwd, dent->d_name)) + "\r\n";
|
|
if (m_xferBuffer.freeSize () < path.size ())
|
|
{
|
|
sendResponse ("501 %s\r\n", std::strerror (ENOMEM));
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
std::memcpy (m_xferBuffer.freeArea (), path.data (), path.size ());
|
|
m_xferBuffer.markUsed (path.size ());
|
|
LOCKED (m_filePosition += path.size ());
|
|
}
|
|
else
|
|
{
|
|
// build the path
|
|
auto const fullPath = buildPath (m_lwd, dent->d_name);
|
|
struct stat st;
|
|
|
|
#ifdef _3DS
|
|
// the sdmc directory entry already has the type and size, so no need to do a slow stat
|
|
auto const dp = static_cast<DIR *> (m_dir);
|
|
auto const magic = *reinterpret_cast<u32 *> (dp->dirData->dirStruct);
|
|
|
|
if (magic == ARCHIVE_DIRITER_MAGIC)
|
|
{
|
|
auto const dir = reinterpret_cast<archive_dir_t const *> (dp->dirData->dirStruct);
|
|
auto const entry = &dir->entry_data[dir->index];
|
|
|
|
if (entry->attributes & FS_ATTRIBUTE_DIRECTORY)
|
|
st.st_mode = S_IFDIR | S_IRUSR | S_IRGRP | S_IROTH;
|
|
else
|
|
st.st_mode = S_IFREG | S_IRUSR | S_IRGRP | S_IROTH;
|
|
|
|
if (!(entry->attributes & FS_ATTRIBUTE_READ_ONLY))
|
|
st.st_mode |= S_IWUSR | S_IWGRP | S_IWOTH;
|
|
|
|
st.st_size = entry->fileSize;
|
|
st.st_mtime = 0;
|
|
|
|
bool getmtime = true;
|
|
if (m_xferDirMode == XferDirMode::MLSD || m_xferDirMode == XferDirMode::MLST)
|
|
{
|
|
if (!m_mlstModify)
|
|
getmtime = false;
|
|
}
|
|
else if (m_xferDirMode == XferDirMode::NLST)
|
|
getmtime = false;
|
|
|
|
{
|
|
auto const lock = m_config.lockGuard ();
|
|
if (!m_config.getMTime ())
|
|
getmtime = false;
|
|
}
|
|
|
|
if (getmtime)
|
|
{
|
|
std::uint64_t mtime = 0;
|
|
auto const rc = archive_getmtime (fullPath.c_str (), &mtime);
|
|
if (rc != 0)
|
|
error ("sdmc_getmtime %s 0x%lx\n", fullPath.c_str (), rc);
|
|
else
|
|
st.st_mtime = mtime;
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
// lstat the entry
|
|
if (::lstat (fullPath.c_str (), &st) != 0)
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
auto const path = encodePath (dent->d_name);
|
|
auto const rc = fillDirent (st, path);
|
|
if (rc != 0)
|
|
{
|
|
sendResponse ("425 %s\r\n", std::strerror (errno));
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
// send any pending data
|
|
auto const rc = m_dataSocket->write (m_xferBuffer);
|
|
if (rc <= 0)
|
|
{
|
|
// error sending data
|
|
if (rc < 0 && errno == EWOULDBLOCK)
|
|
return false;
|
|
|
|
sendResponse ("426 Connection broken during transfer\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
// we can try to send more data
|
|
return true;
|
|
}
|
|
|
|
bool FtpSession::retrieveTransfer ()
|
|
{
|
|
if (m_xferBuffer.empty ())
|
|
{
|
|
m_xferBuffer.clear ();
|
|
|
|
if (!m_devZero)
|
|
{
|
|
// we have sent all the data, so read some more
|
|
auto const rc = m_file.read (m_xferBuffer);
|
|
if (rc < 0)
|
|
{
|
|
// failed to read data
|
|
sendResponse ("451 %s\r\n", std::strerror (errno));
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
if (rc == 0)
|
|
{
|
|
// reached end of file
|
|
sendResponse ("226 OK\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
auto const buffer = m_xferBuffer.freeArea ();
|
|
auto const size = m_xferBuffer.freeSize ();
|
|
|
|
std::memset (buffer, 0, size);
|
|
m_xferBuffer.markUsed (size);
|
|
}
|
|
}
|
|
|
|
// send any pending data
|
|
auto const rc = m_dataSocket->write (m_xferBuffer);
|
|
if (rc <= 0)
|
|
{
|
|
// error sending data
|
|
if (rc < 0 && errno == EWOULDBLOCK)
|
|
return false;
|
|
|
|
sendResponse ("426 Connection broken during transfer\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
// we can try to read/send more data
|
|
LOCKED (m_filePosition += rc);
|
|
return true;
|
|
}
|
|
|
|
bool FtpSession::storeTransfer ()
|
|
{
|
|
if (m_xferBuffer.empty ())
|
|
{
|
|
m_xferBuffer.clear ();
|
|
|
|
// we have written all the received data, so try to get some more
|
|
auto const rc = m_dataSocket->read (m_xferBuffer);
|
|
if (rc < 0)
|
|
{
|
|
// failed to read data
|
|
if (errno == EWOULDBLOCK)
|
|
return false;
|
|
|
|
sendResponse ("451 %s\r\n", std::strerror (errno));
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
if (rc == 0)
|
|
{
|
|
// reached end of file
|
|
sendResponse ("226 OK\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
}
|
|
|
|
if (!m_devZero)
|
|
{
|
|
// write any pending data
|
|
auto const rc = m_file.write (m_xferBuffer);
|
|
if (rc <= 0)
|
|
{
|
|
// error writing data
|
|
sendResponse ("426 %s\r\n", rc < 0 ? std::strerror (errno) : "Failed to write data");
|
|
setState (State::COMMAND, true, true);
|
|
return false;
|
|
}
|
|
|
|
// we can try to recv/write more data
|
|
LOCKED (m_filePosition += rc);
|
|
}
|
|
else
|
|
{
|
|
LOCKED (m_filePosition += m_xferBuffer.usedSize ());
|
|
m_xferBuffer.clear ();
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
///////////////////////////////////////////////////////////////////////////
|
|
void FtpSession::ABOR (char const *args_)
|
|
{
|
|
if (m_state == State::COMMAND)
|
|
{
|
|
sendResponse ("225 No transfer to abort\r\n");
|
|
return;
|
|
}
|
|
|
|
// abort the transfer
|
|
sendResponse ("225 Aborted\r\n");
|
|
sendResponse ("425 Transfer aborted\r\n");
|
|
setState (State::COMMAND, true, true);
|
|
}
|
|
|
|
void FtpSession::ALLO (char const *args_)
|
|
{
|
|
sendResponse ("202 Superfluous command\r\n");
|
|
setState (State::COMMAND, false, false);
|
|
}
|
|
|
|
void FtpSession::APPE (char const *args_)
|
|
{
|
|
if (!authorized ())
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// open the file in append mode
|
|
xferFile (args_, XferFileMode::APPE);
|
|
}
|
|
|
|
void FtpSession::CDUP (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
if (!changeDir (".."))
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
sendResponse ("200 OK\r\n");
|
|
}
|
|
|
|
void FtpSession::CWD (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
if (!changeDir (args_))
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
sendResponse ("200 OK\r\n");
|
|
}
|
|
|
|
void FtpSession::DELE (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// build the path to remove
|
|
auto const path = buildResolvedPath (m_cwd, args_);
|
|
if (path.empty ())
|
|
{
|
|
sendResponse ("553 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
// unlink the path
|
|
if (::unlink (path.c_str ()) != 0)
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
FtpServer::updateFreeSpace ();
|
|
sendResponse ("250 OK\r\n");
|
|
}
|
|
void FtpSession::FEAT (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("211-\r\n"
|
|
" MDTM\r\n"
|
|
" MLST Type%s;Size%s;Modify%s;Perm%s;UNIX.mode%s;\r\n"
|
|
" PASV\r\n"
|
|
" SIZE\r\n"
|
|
" TVFS\r\n"
|
|
" UTF8\r\n"
|
|
"\r\n"
|
|
"211 End\r\n",
|
|
m_mlstType ? "*" : "",
|
|
m_mlstSize ? "*" : "",
|
|
m_mlstModify ? "*" : "",
|
|
m_mlstPerm ? "*" : "",
|
|
m_mlstUnixMode ? "*" : "");
|
|
}
|
|
|
|
void FtpSession::HELP (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("214-\r\n"
|
|
"The following commands are recognized\r\n"
|
|
" ABOR ALLO APPE CDUP CWD DELE FEAT HELP LIST MDTM MKD MLSD MLST MODE\r\n"
|
|
" NLST NOOP OPTS PASS PASV PORT PWD QUIT REST RETR RMD RNFR RNTO SITE\r\n"
|
|
" SIZE STAT STOR STOU STRU SYST TYPE USER XCUP XCWD XMKD XPWD XRMD\r\n"
|
|
"214 End\r\n");
|
|
}
|
|
|
|
void FtpSession::LIST (char const *args_)
|
|
{
|
|
if (!authorized ())
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// open the path in LIST mode
|
|
xferDir (args_, XferDirMode::LIST, true);
|
|
}
|
|
|
|
void FtpSession::MDTM (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
sendResponse ("502 Command not implemented\r\n");
|
|
}
|
|
|
|
void FtpSession::MKD (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// build the path to create
|
|
auto const path = buildResolvedPath (m_cwd, args_);
|
|
if (path.empty ())
|
|
{
|
|
sendResponse ("553 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
// create the directory
|
|
if (::mkdir (path.c_str (), 0755) != 0)
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
FtpServer::updateFreeSpace ();
|
|
sendResponse ("250 OK\r\n");
|
|
}
|
|
|
|
void FtpSession::MLSD (char const *args_)
|
|
{
|
|
if (!authorized ())
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// open the path in MLSD mode
|
|
xferDir (args_, XferDirMode::MLSD, true);
|
|
}
|
|
|
|
void FtpSession::MLST (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
// build the path to list
|
|
auto const path = buildResolvedPath (m_cwd, args_);
|
|
if (path.empty ())
|
|
{
|
|
sendResponse ("501 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
// stat path
|
|
struct stat st;
|
|
if (::lstat (path.c_str (), &st) != 0)
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
// encode path
|
|
auto const encodedPath = encodePath (path);
|
|
|
|
m_xferDirMode = XferDirMode::MLST;
|
|
auto const rc = fillDirent (st, path);
|
|
if (rc != 0)
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (rc));
|
|
return;
|
|
}
|
|
|
|
sendResponse ("250-Status\r\n"
|
|
" %s\r\n"
|
|
"250 End\r\n",
|
|
encodedPath.c_str ());
|
|
}
|
|
|
|
void FtpSession::MODE (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
// we only accept S (stream) mode
|
|
if (::strcasecmp (args_, "S") == 0)
|
|
{
|
|
sendResponse ("200 OK\r\n");
|
|
return;
|
|
}
|
|
|
|
sendResponse ("504 Unavailable\r\n");
|
|
}
|
|
|
|
void FtpSession::NLST (char const *args_)
|
|
{
|
|
if (!authorized ())
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// open the path in NLST mode
|
|
xferDir (args_, XferDirMode::NLST, false);
|
|
}
|
|
|
|
void FtpSession::NOOP (char const *args_)
|
|
{
|
|
sendResponse ("200 OK\r\n");
|
|
}
|
|
|
|
void FtpSession::OPTS (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
// check UTF8 options
|
|
if (::strcasecmp (args_, "UTF8") == 0 || ::strcasecmp (args_, "UTF8 ON") == 0 ||
|
|
::strcasecmp (args_, "UTF8 NLST") == 0)
|
|
{
|
|
sendResponse ("200 OK\r\n");
|
|
return;
|
|
}
|
|
|
|
// check MLST options
|
|
if (::strncasecmp (args_, "MLST ", 5) == 0)
|
|
{
|
|
m_mlstType = false;
|
|
m_mlstSize = false;
|
|
m_mlstModify = false;
|
|
m_mlstPerm = false;
|
|
m_mlstUnixMode = false;
|
|
|
|
auto p = args_ + 5;
|
|
while (*p)
|
|
{
|
|
auto const match = [] (auto const &name_, auto const &arg_) {
|
|
return ::strncasecmp (name_, arg_, std::strlen (name_)) == 0;
|
|
};
|
|
|
|
if (match ("Type;", p))
|
|
m_mlstType = true;
|
|
else if (match ("Size;", p))
|
|
m_mlstSize = true;
|
|
else if (match ("Modify;", p))
|
|
m_mlstModify = true;
|
|
else if (match ("Perm;", p))
|
|
m_mlstPerm = true;
|
|
else if (match ("UNIX.mode;", p))
|
|
m_mlstUnixMode = true;
|
|
|
|
p = std::strchr (p, ';');
|
|
if (!p)
|
|
break;
|
|
|
|
++p;
|
|
}
|
|
|
|
sendResponse ("200 MLST OPTS%s%s%s%s%s%s\r\n",
|
|
m_mlstType || m_mlstSize || m_mlstModify || m_mlstPerm || m_mlstUnixMode ? " " : "",
|
|
m_mlstType ? "Type;" : "",
|
|
m_mlstSize ? "Size;" : "",
|
|
m_mlstModify ? "Modify;" : "",
|
|
m_mlstPerm ? "Perm;" : "",
|
|
m_mlstUnixMode ? "UNIX.mode;" : "");
|
|
return;
|
|
}
|
|
|
|
sendResponse ("504 %s\r\n", std::strerror (EINVAL));
|
|
}
|
|
|
|
void FtpSession::PASS (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
m_authorizedPass = false;
|
|
|
|
std::string user;
|
|
std::string pass;
|
|
|
|
{
|
|
#ifndef NDS
|
|
auto const lock = m_config.lockGuard ();
|
|
#endif
|
|
user = m_config.user ();
|
|
pass = m_config.pass ();
|
|
}
|
|
|
|
if (!user.empty () && !m_authorizedUser)
|
|
{
|
|
sendResponse ("430 User not authorized\r\n");
|
|
return;
|
|
}
|
|
|
|
if (pass.empty () || pass == args_)
|
|
{
|
|
m_authorizedPass = true;
|
|
sendResponse ("230 OK\r\n");
|
|
return;
|
|
}
|
|
|
|
sendResponse ("430 Invalid password\r\n");
|
|
}
|
|
|
|
void FtpSession::PASV (char const *args_)
|
|
{
|
|
if (!authorized ())
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// reset state
|
|
setState (State::COMMAND, true, true);
|
|
m_pasv = false;
|
|
m_port = false;
|
|
|
|
// create a socket to listen on
|
|
auto pasv = Socket::create ();
|
|
LOCKED (m_pasvSocket = std::move (pasv));
|
|
if (!m_pasvSocket)
|
|
{
|
|
sendResponse ("451 Failed to create listening socket\r\n");
|
|
return;
|
|
}
|
|
|
|
// set the socket options
|
|
m_pasvSocket->setRecvBufferSize (SOCK_BUFFERSIZE);
|
|
m_pasvSocket->setSendBufferSize (SOCK_BUFFERSIZE);
|
|
|
|
// create an address to bind
|
|
struct sockaddr_in addr = m_commandSocket->sockName ();
|
|
#if defined(NDS) || defined(_3DS)
|
|
static std::uint16_t ephemeralPort = 5001;
|
|
if (ephemeralPort > 10000)
|
|
ephemeralPort = 5001;
|
|
addr.sin_port = htons (ephemeralPort++);
|
|
#else
|
|
addr.sin_port = htons (0);
|
|
#endif
|
|
|
|
// bind to the address
|
|
if (!m_pasvSocket->bind (addr))
|
|
{
|
|
closePasv ();
|
|
sendResponse ("451 Failed to bind address\r\n");
|
|
return;
|
|
}
|
|
|
|
// listen on the socket
|
|
if (!m_pasvSocket->listen (1))
|
|
{
|
|
closePasv ();
|
|
sendResponse ("451 Failed to listen on socket\r\n");
|
|
return;
|
|
}
|
|
|
|
// we are now listening on the socket
|
|
auto const &sockName = m_pasvSocket->sockName ();
|
|
std::string name = sockName.name ();
|
|
auto const port = sockName.port ();
|
|
info ("Listening on [%s]:%u\n", name.c_str (), port);
|
|
|
|
// send the address in the ftp format
|
|
for (auto &c : name)
|
|
{
|
|
if (c == '.')
|
|
c = ',';
|
|
}
|
|
|
|
m_pasv = true;
|
|
sendResponse (
|
|
"227 Entering Passive Mode (%s,%u,%u).\r\n", name.c_str (), port >> 8, port & 0xFF);
|
|
}
|
|
|
|
void FtpSession::PORT (char const *args_)
|
|
{
|
|
if (!authorized ())
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// reset state
|
|
setState (State::COMMAND, true, true);
|
|
m_pasv = false;
|
|
m_port = false;
|
|
|
|
std::string addrString = args_;
|
|
|
|
// convert a,b,c,d,e,f with a.b.c.d\0e.f
|
|
unsigned commas = 0;
|
|
char const *portString = nullptr;
|
|
for (auto &p : addrString)
|
|
{
|
|
if (p == ',')
|
|
{
|
|
if (commas++ != 3)
|
|
p = '.';
|
|
else
|
|
{
|
|
p = '\0';
|
|
portString = &p + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
// check for the expected number of fields
|
|
if (commas != 5)
|
|
{
|
|
sendResponse ("501 %s\r\n", std::strerror (EINVAL));
|
|
return;
|
|
}
|
|
|
|
struct sockaddr_in addr = {};
|
|
|
|
// parse the address
|
|
if (!inet_aton (addrString.data (), &addr.sin_addr))
|
|
{
|
|
sendResponse ("501 %s\r\n", std::strerror (EINVAL));
|
|
return;
|
|
}
|
|
|
|
// parse the port
|
|
int val = 0;
|
|
std::uint16_t port = 0;
|
|
for (auto p = portString; *p; ++p)
|
|
{
|
|
if (!std::isdigit (*p))
|
|
{
|
|
if (p == portString || *p != '.' || val > 0xFF)
|
|
{
|
|
sendResponse ("501 %s\r\n", std::strerror (EINVAL));
|
|
return;
|
|
}
|
|
|
|
port <<= 8;
|
|
port += val;
|
|
val = 0;
|
|
}
|
|
else
|
|
{
|
|
val *= 10;
|
|
val += *p - '0';
|
|
}
|
|
}
|
|
|
|
if (val > 0xFF || port > 0xFF)
|
|
{
|
|
sendResponse ("501 %s\r\n", std::strerror (EINVAL));
|
|
return;
|
|
}
|
|
|
|
port <<= 8;
|
|
port += val;
|
|
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons (port);
|
|
|
|
// we are ready to connect to the client
|
|
m_portAddr = addr;
|
|
m_port = true;
|
|
sendResponse ("200 OK\r\n");
|
|
}
|
|
|
|
void FtpSession::PWD (char const *args_)
|
|
{
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
auto const path = encodePath (m_cwd);
|
|
|
|
std::string response = "257 \"";
|
|
response += encodePath (m_cwd, true);
|
|
response += "\"\r\n";
|
|
|
|
sendResponse (response);
|
|
}
|
|
|
|
void FtpSession::QUIT (char const *args_)
|
|
{
|
|
sendResponse ("221 Disconnecting\r\n");
|
|
closeCommand ();
|
|
}
|
|
|
|
void FtpSession::REST (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// parse the offset
|
|
std::uint64_t pos = 0;
|
|
for (auto p = args_; *p; ++p)
|
|
{
|
|
if (!std::isdigit (*p) || UINT64_MAX / 10 < pos)
|
|
{
|
|
sendResponse ("504 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
pos *= 10;
|
|
|
|
if (UINT64_MAX - (*p - '0') < pos)
|
|
{
|
|
sendResponse ("504 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
pos += (*p - '0');
|
|
}
|
|
|
|
// set the restart offset
|
|
m_restartPosition = pos;
|
|
sendResponse ("200 OK\r\n");
|
|
}
|
|
|
|
void FtpSession::RETR (char const *args_)
|
|
{
|
|
if (!authorized ())
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// open the file to retrieve
|
|
xferFile (args_, XferFileMode::RETR);
|
|
}
|
|
|
|
void FtpSession::RMD (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// build the path to remove
|
|
auto const path = buildResolvedPath (m_cwd, args_);
|
|
if (path.empty ())
|
|
{
|
|
sendResponse ("553 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
// remove the directory
|
|
if (::rmdir (path.c_str ()) != 0)
|
|
{
|
|
sendResponse ("550 %d %s\r\n", __LINE__, std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
FtpServer::updateFreeSpace ();
|
|
sendResponse ("250 OK\r\n");
|
|
}
|
|
|
|
void FtpSession::RNFR (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// build the path to rename from
|
|
auto const path = buildResolvedPath (m_cwd, args_);
|
|
if (path.empty ())
|
|
{
|
|
sendResponse ("553 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
// make sure the path exists
|
|
struct stat st;
|
|
if (::lstat (path.c_str (), &st) != 0)
|
|
{
|
|
sendResponse ("450 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
// we are ready for RNTO
|
|
m_rename = path;
|
|
sendResponse ("350 OK\r\n");
|
|
}
|
|
|
|
void FtpSession::RNTO (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// make sure the previous command was RNFR
|
|
if (m_rename.empty ())
|
|
{
|
|
sendResponse ("503 Bad sequence of commands\r\n");
|
|
return;
|
|
}
|
|
|
|
// build the path to rename to
|
|
auto const path = buildResolvedPath (m_cwd, args_);
|
|
if (path.empty ())
|
|
{
|
|
m_rename.clear ();
|
|
sendResponse ("554 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
// rename the file
|
|
if (::rename (m_rename.c_str (), path.c_str ()) != 0)
|
|
{
|
|
m_rename.clear ();
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
// clear the rename state
|
|
m_rename.clear ();
|
|
|
|
FtpServer::updateFreeSpace ();
|
|
sendResponse ("250 OK\r\n");
|
|
}
|
|
|
|
void FtpSession::SITE (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
auto const str = std::string (args_);
|
|
auto const pos = str.find_first_of (' ');
|
|
|
|
auto const command = str.substr (0, pos);
|
|
auto const arg = pos == std::string::npos ? std::string () : str.substr (pos + 1);
|
|
|
|
if (::strcasecmp (command.c_str (), "HELP") == 0)
|
|
{
|
|
sendResponse ("211-\r\n"
|
|
" Show this help: SITE HELP\r\n"
|
|
" Set username: SITE USER <NAME>\r\n"
|
|
" Set password: SITE PASS <PASS>\r\n"
|
|
" Set port: SITE PORT <PORT>\r\n"
|
|
#ifdef _3DS
|
|
" Set getMTime: SITE MTIME [0|1]\r\n"
|
|
#endif
|
|
" Save config: SITE SAVE\r\n"
|
|
"211 End\r\n");
|
|
return;
|
|
}
|
|
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
if (::strcasecmp (command.c_str (), "USER") == 0)
|
|
{
|
|
{
|
|
#ifndef NDS
|
|
auto const lock = m_config.lockGuard ();
|
|
#endif
|
|
m_config.setUser (arg);
|
|
}
|
|
|
|
sendResponse ("200 OK\r\n");
|
|
return;
|
|
}
|
|
else if (::strcasecmp (command.c_str (), "PASS") == 0)
|
|
{
|
|
{
|
|
#ifndef NDS
|
|
auto const lock = m_config.lockGuard ();
|
|
#endif
|
|
m_config.setPass (arg);
|
|
}
|
|
|
|
sendResponse ("200 OK\r\n");
|
|
return;
|
|
}
|
|
else if (::strcasecmp (command.c_str (), "PORT") == 0)
|
|
{
|
|
bool error = false;
|
|
|
|
{
|
|
#ifndef NDS
|
|
auto const lock = m_config.lockGuard ();
|
|
#endif
|
|
error = !m_config.setPort (arg);
|
|
}
|
|
|
|
if (error)
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
sendResponse ("200 OK\r\n");
|
|
return;
|
|
}
|
|
#ifdef _3DS
|
|
else if (::strcasecmp (command.c_str (), "MTIME") == 0)
|
|
{
|
|
if (arg == "0")
|
|
{
|
|
#ifndef NDS
|
|
auto const lock = m_config.lockGuard ();
|
|
#endif
|
|
m_config.setGetMTime (false);
|
|
}
|
|
else if (arg == "1")
|
|
{
|
|
#ifndef NDS
|
|
auto const lock = m_config.lockGuard ();
|
|
#endif
|
|
m_config.setGetMTime (true);
|
|
}
|
|
else
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (EINVAL));
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
else if (::strcasecmp (command.c_str (), "SAVE") == 0)
|
|
{
|
|
bool error;
|
|
|
|
{
|
|
#ifndef NDS
|
|
auto const lock = m_config.lockGuard ();
|
|
#endif
|
|
error = !m_config.save (FTPDCONFIG);
|
|
}
|
|
|
|
if (error)
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
sendResponse ("200 OK\r\n");
|
|
return;
|
|
}
|
|
|
|
sendResponse ("550 Invalid command\r\n");
|
|
}
|
|
|
|
void FtpSession::SIZE (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
if (!authorized ())
|
|
{
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// build the path to stat
|
|
auto const path = buildResolvedPath (m_cwd, args_);
|
|
if (path.empty ())
|
|
{
|
|
sendResponse ("553 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
// stat the path
|
|
struct stat st;
|
|
if (::stat (path.c_str (), &st) != 0)
|
|
{
|
|
sendResponse ("550 %s\r\n", std::strerror (errno));
|
|
return;
|
|
}
|
|
|
|
if (!S_ISREG (st.st_mode))
|
|
{
|
|
sendResponse ("550 Not a file\r\n");
|
|
return;
|
|
}
|
|
|
|
sendResponse ("213 %" PRIu64 "\r\n", static_cast<std::uint64_t> (st.st_size));
|
|
}
|
|
|
|
void FtpSession::STAT (char const *args_)
|
|
{
|
|
if (m_state == State::DATA_CONNECT)
|
|
{
|
|
sendResponse ("211-FTP server status\r\n"
|
|
" Waiting for data connection\r\n"
|
|
"211 End\r\n");
|
|
return;
|
|
}
|
|
|
|
if (m_state == State::DATA_TRANSFER)
|
|
{
|
|
sendResponse ("211-FTP server status\r\n"
|
|
" Transferred %" PRIu64 " bytes\r\n"
|
|
"211 End\r\n",
|
|
m_filePosition);
|
|
return;
|
|
}
|
|
|
|
if (std::strlen (args_) == 0)
|
|
{
|
|
// TODO keep track of start time
|
|
auto const uptime =
|
|
std::chrono::system_clock::to_time_t (std::chrono::system_clock::now ()) -
|
|
FtpServer::startTime ();
|
|
unsigned const hours = uptime / 3600;
|
|
unsigned const minutes = (uptime / 60) % 60;
|
|
unsigned const seconds = uptime % 60;
|
|
|
|
sendResponse ("211-FTP server status\r\n"
|
|
" Uptime: %02u:%02u:%02u\r\n"
|
|
"211 End\r\n",
|
|
hours,
|
|
minutes,
|
|
seconds);
|
|
return;
|
|
}
|
|
|
|
if (!authorized ())
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
xferDir (args_, XferDirMode::STAT, false);
|
|
}
|
|
|
|
void FtpSession::STOR (char const *args_)
|
|
{
|
|
if (!authorized ())
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("530 Not logged in\r\n");
|
|
return;
|
|
}
|
|
|
|
// open the file to store
|
|
xferFile (args_, XferFileMode::STOR);
|
|
}
|
|
|
|
void FtpSession::STOU (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("502 Command not implemented\r\n");
|
|
}
|
|
|
|
void FtpSession::STRU (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
// we only support F (no structure) mode
|
|
if (::strcasecmp (args_, "F") == 0)
|
|
{
|
|
sendResponse ("200 OK\r\n");
|
|
return;
|
|
}
|
|
|
|
sendResponse ("504 Unavailable\r\n");
|
|
}
|
|
|
|
void FtpSession::SYST (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
sendResponse ("215 UNIX Type: L8\r\n");
|
|
}
|
|
|
|
void FtpSession::TYPE (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
// we always transfer in binary mode
|
|
sendResponse ("200 OK\r\n");
|
|
}
|
|
|
|
void FtpSession::USER (char const *args_)
|
|
{
|
|
setState (State::COMMAND, false, false);
|
|
|
|
m_authorizedUser = false;
|
|
|
|
std::string user;
|
|
std::string pass;
|
|
|
|
{
|
|
#ifndef NDS
|
|
auto const lock = m_config.lockGuard ();
|
|
#endif
|
|
user = m_config.user ();
|
|
pass = m_config.pass ();
|
|
}
|
|
|
|
if (user.empty () || user == args_)
|
|
{
|
|
m_authorizedUser = true;
|
|
if (pass.empty ())
|
|
{
|
|
sendResponse ("230 OK\r\n");
|
|
return;
|
|
}
|
|
|
|
sendResponse ("331 Need password\r\n");
|
|
return;
|
|
}
|
|
|
|
sendResponse ("430 Invalid user\r\n");
|
|
}
|
|
|
|
// clang-format off
|
|
std::vector<std::pair<std::string_view, void (FtpSession::*) (char const *)>> const
|
|
FtpSession::handlers =
|
|
{
|
|
{"ABOR", &FtpSession::ABOR},
|
|
{"ALLO", &FtpSession::ALLO},
|
|
{"APPE", &FtpSession::APPE},
|
|
{"CDUP", &FtpSession::CDUP},
|
|
{"CWD", &FtpSession::CWD},
|
|
{"DELE", &FtpSession::DELE},
|
|
{"FEAT", &FtpSession::FEAT},
|
|
{"HELP", &FtpSession::HELP},
|
|
{"LIST", &FtpSession::LIST},
|
|
{"MDTM", &FtpSession::MDTM},
|
|
{"MKD", &FtpSession::MKD},
|
|
{"MLSD", &FtpSession::MLSD},
|
|
{"MLST", &FtpSession::MLST},
|
|
{"MODE", &FtpSession::MODE},
|
|
{"NLST", &FtpSession::NLST},
|
|
{"NOOP", &FtpSession::NOOP},
|
|
{"OPTS", &FtpSession::OPTS},
|
|
{"PASS", &FtpSession::PASS},
|
|
{"PASV", &FtpSession::PASV},
|
|
{"PORT", &FtpSession::PORT},
|
|
{"PWD", &FtpSession::PWD},
|
|
{"QUIT", &FtpSession::QUIT},
|
|
{"REST", &FtpSession::REST},
|
|
{"RETR", &FtpSession::RETR},
|
|
{"RMD", &FtpSession::RMD},
|
|
{"RNFR", &FtpSession::RNFR},
|
|
{"RNTO", &FtpSession::RNTO},
|
|
{"SITE", &FtpSession::SITE},
|
|
{"SIZE", &FtpSession::SIZE},
|
|
{"STAT", &FtpSession::STAT},
|
|
{"STOR", &FtpSession::STOR},
|
|
{"STOU", &FtpSession::STOU},
|
|
{"STRU", &FtpSession::STRU},
|
|
{"SYST", &FtpSession::SYST},
|
|
{"TYPE", &FtpSession::TYPE},
|
|
{"USER", &FtpSession::USER},
|
|
{"XCUP", &FtpSession::CDUP},
|
|
{"XCWD", &FtpSession::CWD},
|
|
{"XMKD", &FtpSession::MKD},
|
|
{"XPWD", &FtpSession::PWD},
|
|
{"XRMD", &FtpSession::RMD},
|
|
};
|
|
// clang-format on
|