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Atmosphere/stratosphere/TioServer/source/tio_file_server_processor.cpp

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tio: implement server/dispatch logic.
2021-02-24 15:16:41 +00:00
/*
* Copyright (c) 2018-2020 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope 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 <http://www.gnu.org/licenses/>.
*/
#include <stratosphere.hpp>
#include "tio_file_server_processor.hpp"
namespace ams::tio {
namespace {
constexpr inline int ProtocolVersion = 1;
}
void FileServerProcessor::Unmount() {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Close all our directories. */
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if (m_open_directory_count > 0) {
for (size_t i = 0; i < util::size(m_directories); ++i) {
if (m_directories[i].handle != nullptr) {
fs::CloseDirectory(m_directories[i]);
m_directories[i] = {};
--m_open_directory_count;
}
}
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}
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AMS_ABORT_UNLESS(m_open_directory_count == 0);
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/* Close all our files. */
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if (m_open_file_count > 0) {
for (size_t i = 0; i < util::size(m_files); ++i) {
if (m_files[i].handle != nullptr) {
fs::CloseFile(m_files[i]);
m_files[i] = {};
--m_open_file_count;
}
}
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}
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AMS_ABORT_UNLESS(m_open_file_count == 0);
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/* If we're mounted, unmount the sd card. */
if (m_is_mounted) {
m_is_mounted = false;
fs::Unmount("sd");
}
}
bool FileServerProcessor::ProcessRequest(FileServerRequestHeader *header, u8 *body, int socket) {
/* Declare a response header for us to use. */
FileServerResponseHeader response_header = {
.request_id = header->request_id,
.result = ResultSuccess(),
.body_size = 0,
};
/* Handle the special control commands. */
if (header->packet_type == PacketType::Connect) {
/* If the SD card isn't already mounted, try to mount it. */
if (!m_is_mounted) {
/* Mount the sd card. */
m_is_mounted = !fs::ResultSdCardAccessFailed::Includes(fs::MountSdCard("sd"));
/* Prepare the response. */
char *response_body = reinterpret_cast<char *>(body);
util::SNPrintf(response_body, 0x100, "{\"bufferSize\":%zu, \"sdcardMounted\":%s, \"sdcardInserted\":%s, \"version\":%d}",
m_request_buffer_size,
m_is_mounted ? "true" : "false",
m_is_inserted ? "true" : "false",
ProtocolVersion);
/* Get the response length. */
response_header.body_size = std::strlen(response_body);
}
return this->SendResponse(response_header, body, socket);
} else if (header->packet_type == PacketType::Disconnect) {
/* If we need to, unmount the sd card. */
if (m_is_mounted) {
this->Unmount();
}
/* Send the response. */
return this->SendResponse(response_header, body, socket);
}
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/* The SD card must be inserted and mounted for us to process requests. */
if (m_is_inserted && m_is_mounted) {
switch (header->packet_type) {
case PacketType::CreateDirectory:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const CreateDirectoryParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Create the directory. */
response_header.result = fs::CreateDirectory(param->path);
}
break;
case PacketType::DeleteDirectory:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const DeleteDirectoryParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Delete the directory. */
response_header.result = fs::DeleteDirectory(param->path);
}
break;
case PacketType::DeleteDirectoryRecursively:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const DeleteDirectoryRecursivelyParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Delete the directory. */
response_header.result = fs::DeleteDirectoryRecursively(param->path);
}
break;
case PacketType::OpenDirectory:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const OpenDirectoryParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Open the directory. */
fs::DirectoryHandle handle;
response_header.result = fs::OpenDirectory(std::addressof(handle), param->path, param->open_mode);
if (R_SUCCEEDED(response_header.result)) {
std::scoped_lock lk(m_mutex);
if (m_open_directory_count < util::size(m_directories)) {
/* Insert the directory into our table. */
u64 index = std::numeric_limits<u64>::max();
for (size_t i = 0; i < util::size(m_directories); ++i) {
if (m_directories[i].handle == nullptr) {
m_directories[i] = handle;
index = i;
++m_open_directory_count;
break;
}
}
AMS_ABORT_UNLESS(index < util::size(m_directories));
/* Return the index. */
response_header.body_size = sizeof(index);
std::memcpy(body, std::addressof(index), sizeof(index));
} else {
/* We can't actually open the directory. */
fs::CloseDirectory(handle);
response_header.result = fs::ResultOpenCountLimit();
}
}
}
break;
case PacketType::CloseDirectory:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const CloseDirectoryParam *>(body);
if (header->body_size != sizeof(*param)) {
return false;
}
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Check that the directory handle is valid. */
if (param->handle >= util::size(m_directories) || m_directories[param->handle].handle == nullptr) {
response_header.result = fs::ResultDataCorrupted();
break;
}
/* Lock the filesystem. */
std::scoped_lock lk2(m_fs_mutex);
/* Close the directory. */
fs::CloseDirectory(m_directories[param->handle]);
m_directories[param->handle].handle = {};
--m_open_directory_count;
}
break;
case PacketType::RenameDirectory:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const RenameDirectoryParam *>(body);
if (header->body_size != sizeof(*param) + param->old_len + param->new_len) {
return false;
}
/* Delete the directory. */
const char *old_path = param->data + 0;
const char *new_path = param->data + param->old_len;
response_header.result = fs::RenameDirectory(old_path, new_path);
}
break;
case PacketType::CreateFile:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const CreateFileParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Create the file. */
response_header.result = fs::CreateFile(param->path, param->size, static_cast<int>(param->option));
}
break;
case PacketType::DeleteFile:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const DeleteFileParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Delete the file. */
response_header.result = fs::DeleteFile(param->path);
}
break;
case PacketType::OpenFile:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const OpenFileParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Open the file. */
fs::FileHandle handle;
response_header.result = fs::OpenFile(std::addressof(handle), param->path, param->mode);
if (R_SUCCEEDED(response_header.result)) {
std::scoped_lock lk(m_mutex);
if (m_open_file_count < util::size(m_files)) {
/* Insert the file into our table. */
u64 index = std::numeric_limits<u64>::max();
for (size_t i = 0; i < util::size(m_files); ++i) {
if (m_files[i].handle == nullptr) {
m_files[i] = handle;
index = i;
++m_open_file_count;
break;
}
}
AMS_ABORT_UNLESS(index < util::size(m_files));
/* Return the index. */
response_header.body_size = sizeof(index);
std::memcpy(body, std::addressof(index), sizeof(index));
} else {
/* We can't actually open the file. */
fs::CloseFile(handle);
response_header.result = fs::ResultOpenCountLimit();
}
}
}
break;
case PacketType::FlushFile:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const FlushFileParam *>(body);
if (header->body_size != sizeof(*param)) {
return false;
}
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Check that the file handle is valid. */
if (param->handle >= util::size(m_files) || m_files[param->handle].handle == nullptr) {
response_header.result = fs::ResultDataCorrupted();
break;
}
/* Lock the filesystem. */
std::scoped_lock lk2(m_fs_mutex);
/* Flush the file. */
response_header.result = fs::FlushFile(m_files[param->handle]);
}
break;
case PacketType::CloseFile:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const CloseFileParam *>(body);
if (header->body_size != sizeof(*param)) {
return false;
}
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Check that the file handle is valid. */
if (param->handle >= util::size(m_files) || m_files[param->handle].handle == nullptr) {
response_header.result = fs::ResultDataCorrupted();
break;
}
/* Lock the filesystem. */
std::scoped_lock lk2(m_fs_mutex);
/* Close the directory. */
fs::CloseFile(m_files[param->handle]);
m_files[param->handle].handle = {};
--m_open_file_count;
}
break;
case PacketType::RenameFile:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const RenameFileParam *>(body);
if (header->body_size != sizeof(*param) + param->old_len + param->new_len) {
return false;
}
/* Delete the directory. */
const char *old_path = param->data + 0;
const char *new_path = param->data + param->old_len;
response_header.result = fs::RenameFile(old_path, new_path);
}
break;
case PacketType::ReadFile:
{
/* Get the parameters. */
const auto param = *reinterpret_cast<const ReadFileParam *>(body);
if (header->body_size != sizeof(param)) {
return false;
}
/* Check that the read is valid. */
if (param.size + sizeof(u64) > m_request_buffer_size) {
response_header.result = fs::ResultDataCorrupted();
break;
}
/* Prepare response variables. */
u64 *out_size = reinterpret_cast<u64 *>(body);
void *dst = out_size + 1;
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Check that the file handle is valid. */
if (param.handle >= util::size(m_files) || m_files[param.handle].handle == nullptr) {
response_header.result = fs::ResultDataCorrupted();
break;
}
/* Read the file. */
size_t read_size;
response_header.result = fs::ReadFile(std::addressof(read_size), m_files[param.handle], param.offset, dst, param.size);
if (R_SUCCEEDED(response_header.result)) {
*out_size = read_size;
response_header.body_size = sizeof(u64) + read_size;
}
}
break;
case PacketType::WriteFile:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const WriteFileParam *>(body);
if (header->body_size != sizeof(*param) + param->size) {
return false;
}
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Check that the file handle is valid. */
if (param->handle >= util::size(m_files) || m_files[param->handle].handle == nullptr) {
response_header.result = fs::ResultDataCorrupted();
break;
}
/* Lock the filesystem. */
std::scoped_lock lk2(m_fs_mutex);
/* Write the file. */
response_header.result = fs::WriteFile(m_files[param->handle], param->offset, body + sizeof(*param), param->size, param->option);
}
break;
case PacketType::GetEntryType:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const GetEntryTypeParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Get the entry type. */
fs::DirectoryEntryType type;
response_header.result = fs::GetEntryType(std::addressof(type), param->path);
if (R_SUCCEEDED(response_header.result)) {
/* Return the type. */
response_header.body_size = sizeof(type);
std::memcpy(body, std::addressof(type), sizeof(type));
static_assert(sizeof(type) == sizeof(u32));
}
}
break;
case PacketType::ReadDirectory:
{
/* Get the parameters. */
const auto param = *reinterpret_cast<const ReadDirectoryParam *>(body);
if (header->body_size != sizeof(param)) {
return false;
}
/* Check that the read is valid. */
if (sizeof(s64) + param.count * sizeof(fs::DirectoryEntry) > m_request_buffer_size) {
response_header.result = fs::ResultDataCorrupted();
break;
}
/* Prepare response variables. */
s64 *out_count = reinterpret_cast<s64 *>(body);
fs::DirectoryEntry *dst = reinterpret_cast<fs::DirectoryEntry *>(out_count + 1);
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Check that the directory handle is valid. */
if (param.handle >= util::size(m_directories) || m_directories[param.handle].handle == nullptr) {
response_header.result = fs::ResultDataCorrupted();
break;
}
/* Read the directory. */
response_header.result = fs::ReadDirectory(out_count, dst, m_directories[param.handle], param.count);
if (R_SUCCEEDED(response_header.result)) {
response_header.body_size = sizeof(s64) + *out_count * sizeof(fs::DirectoryEntry);
}
}
break;
case PacketType::GetFileSize:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const GetFileSizeParam *>(body);
if (header->body_size != sizeof(*param)) {
return false;
}
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Check that the file handle is valid. */
if (param->handle >= util::size(m_files) || m_files[param->handle].handle == nullptr) {
response_header.result = fs::ResultDataCorrupted();
break;
}
/* Get the file size. */
response_header.result = fs::GetFileSize(reinterpret_cast<s64 *>(body), m_files[param->handle]);
if (R_SUCCEEDED(response_header.result)) {
response_header.body_size = sizeof(s64);
}
}
break;
case PacketType::SetFileSize:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const SetFileSizeParam *>(body);
if (header->body_size != sizeof(*param)) {
return false;
}
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Check that the file handle is valid. */
if (param->handle >= util::size(m_files) || m_files[param->handle].handle == nullptr) {
response_header.result = fs::ResultDataCorrupted();
break;
}
/* Lock the filesystem. */
std::scoped_lock lk2(m_fs_mutex);
/* Get the file size. */
response_header.result = fs::SetFileSize(m_files[param->handle], param->size);
}
break;
case PacketType::GetTotalSpaceSize:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const GetTotalSpaceSizeParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Get the total space size. */
s64 size;
response_header.result = fs::GetTotalSpaceSize(std::addressof(size), param->path);
if (R_SUCCEEDED(response_header.result)) {
/* Return the size. */
response_header.body_size = sizeof(size);
std::memcpy(body, std::addressof(size), sizeof(size));
}
}
break;
case PacketType::GetFreeSpaceSize:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const GetFreeSpaceSizeParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Get the free space size. */
s64 size;
response_header.result = fs::GetFreeSpaceSize(std::addressof(size), param->path);
if (R_SUCCEEDED(response_header.result)) {
/* Return the size. */
response_header.body_size = sizeof(size);
std::memcpy(body, std::addressof(size), sizeof(size));
}
}
break;
case PacketType::Stat:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const StatParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Prepare a response stat structure. */
struct {
fs::DirectoryEntryType type;
s64 file_size;
fs::FileTimeStampRaw file_timestamp;
} out = {};
static_assert(sizeof(out) == 0x30);
/* Get the entry type. */
response_header.result = fs::GetEntryType(std::addressof(out.type), param->path);
if (R_FAILED(response_header.result)) {
break;
}
/* If the path is a file, get further information. */
if (out.type == fs::DirectoryEntryType_File) {
/* Try to get the file size. */
{
fs::FileHandle handle;
const auto open_result = fs::OpenFile(std::addressof(handle), param->path, fs::OpenMode_Read);
if (R_SUCCEEDED(open_result)) {
ON_SCOPE_EXIT { fs::CloseFile(handle); };
response_header.result = fs::GetFileSize(std::addressof(out.file_size), handle);
if (R_FAILED(response_header.result)) {
break;
}
} else {
if (fs::ResultTargetLocked::Includes(open_result)) {
out.file_size = 0;
} else {
response_header.result = open_result;
break;
}
}
}
/* Get the file timestamp. */
response_header.result = fs::GetFileTimeStampRawForDebug(std::addressof(out.file_timestamp), param->path);
if (R_FAILED(response_header.result)) {
break;
}
}
/* If we successfully got the stat information, send it as response. */
if (R_SUCCEEDED(response_header.result)) {
response_header.body_size = sizeof(out);
std::memcpy(body, std::addressof(out), sizeof(out));
}
}
break;
case PacketType::ListDirectory:
{
/* Get the parameters. */
const auto *param = reinterpret_cast<const ListDirectoryParam *>(body);
if (header->body_size != sizeof(*param) + param->path_len) {
return false;
}
/* Open the directory. */
fs::DirectoryHandle handle;
response_header.result = fs::OpenDirectory(std::addressof(handle), param->path, fs::OpenDirectoryMode_All);
if (R_FAILED(response_header.result)) {
break;
}
/* When we're done, close the handle. */
ON_SCOPE_EXIT { fs::CloseDirectory(handle); };
/* Get the directory entry count. */
s64 count;
response_header.result = fs::GetDirectoryEntryCount(std::addressof(count), handle);
if (R_FAILED(response_header.result)) {
break;
}
/* Determine whether we can send the response in one go. */
const size_t needed_size = sizeof(s64) + sizeof(u64) + sizeof(fs::DirectoryEntry) * count;
if (needed_size <= m_request_buffer_size) {
/* We can perform the entire read in one send. */
struct {
s64 count;
u64 size;
fs::DirectoryEntry entries[];
} *out = reinterpret_cast<decltype(out)>(body);
s64 read_count;
response_header.result = fs::ReadDirectory(std::addressof(read_count), out->entries, handle, count);
if (R_FAILED(response_header.result)) {
break;
}
/* Set the output. */
out->count = read_count;
out->size = read_count * sizeof(fs::DirectoryEntry);
/* Set the response body size. */
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response_header.body_size = sizeof(*out) + out->size;
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} else {
/* We have to use multiple sends. */
/* Lock our server. */
std::scoped_lock lk(m_htcs_server.GetMutex());
/* Send the response header. */
response_header.body_size = needed_size;
if (m_htcs_server.Send(socket, std::addressof(header), sizeof(header), 0) != sizeof(header)) {
return false;
}
/* Send the body header. */
struct {
s64 count;
u64 size;
} out = { count, count * sizeof(fs::DirectoryEntry) };
if (m_htcs_server.Send(socket, std::addressof(out), sizeof(out), 0) != sizeof(out)) {
return false;
}
/* Loop sending entries. */
s64 remaining = count;
do {
/* Determine how many entries we can read. */
const s64 cur = std::min<s64>(remaining, static_cast<s64>(m_request_buffer_size / sizeof(fs::DirectoryEntry)));
/* NOTE: Nintendo does not check the output of this call. */
s64 read_count = 0;
fs::ReadDirectory(std::addressof(read_count), reinterpret_cast<fs::DirectoryEntry *>(body), handle, cur);
/* Send the current entries. */
const ssize_t cur_size = read_count * sizeof(fs::DirectoryEntry);
if (m_htcs_server.Send(socket, body, cur_size, 0) != cur_size) {
return false;
}
/* Advance. */
remaining -= read_count;
} while (remaining > 0);
/* We've sent the entirety of our response, so early return. */
return true;
}
}
break;
default:
/* Unsupported packet. */
return false;
}
/* Send the response. */
return this->SendResponse(response_header, body, socket);
} else if (m_is_mounted) {
/* The SD card is mounted but not inserted, so we should unmount it. */
this->Unmount();
}
/* We failed to process the request due to SD card not being inserted or mounted. */
response_header.result = fs::ResultSdCardAccessFailed();
return this->SendResponse(response_header, body, socket);
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}
bool FileServerProcessor::SendResponse(const FileServerResponseHeader &header, const void *body, int socket) {
/* Lock our server. */
std::scoped_lock lk(m_htcs_server.GetMutex());
/* Send the response header. */
if (m_htcs_server.Send(socket, std::addressof(header), sizeof(header), 0) != sizeof(header)) {
return false;
}
/* If we don't have a body, we're done. */
if (header.body_size == 0) {
return true;
}
/* Send the body. */
return m_htcs_server.Send(socket, body, header.body_size, 0) == header.body_size;
}
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}
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