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Atmosphere/libraries/libstratosphere/source/htclow/ctrl/htclow_ctrl_service.cpp

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/*
* 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 "htclow_ctrl_service.hpp"
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#include "htclow_ctrl_state.hpp"
#include "htclow_ctrl_state_machine.hpp"
#include "htclow_ctrl_packet_factory.hpp"
#include "htclow_service_channel_parser.hpp"
#include "htclow_ctrl_service_channels.hpp"
#include "../mux/htclow_mux.hpp"
namespace ams::htclow::ctrl {
namespace {
constexpr const char BeaconPacketResponseTemplate[] =
"{\r\n"
" \"Spec\" : \"%s\",\r\n"
" \"Conn\" : \"%s\",\r\n"
" \"HW\" : \"%s\",\r\n"
" \"Name\" : \"%s\",\r\n"
" \"SN\" : \"%s\",\r\n"
" \"FW\" : \"%s\",\r\n"
" \"Prot\" : \"%d\"\r\n"
"}\r\n";
}
HtcctrlService::HtcctrlService(HtcctrlPacketFactory *pf, HtcctrlStateMachine *sm, mux::Mux *mux)
: m_settings_holder(), m_beacon_response(), m_information_body(), m_packet_factory(pf), m_state_machine(sm), m_mux(mux), m_event(os::EventClearMode_ManualClear),
m_send_buffer(pf), m_mutex(), m_condvar(), m_service_channels_packet(), m_version(ProtocolVersion)
{
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Set the mux version. */
m_mux->SetVersion(m_version);
/* Update our beacon response. */
this->UpdateBeaconResponse(this->GetConnectionType(impl::DriverType::Unknown));
}
const char *HtcctrlService::GetConnectionType(impl::DriverType driver_type) const {
switch (driver_type) {
case impl::DriverType::Socket: return "TCP";
case impl::DriverType::Usb: return "USB-gen2";
case impl::DriverType::PlainChannel: return "HBPC-gen2";
default: return "Unknown";
}
}
void HtcctrlService::UpdateBeaconResponse(const char *connection) {
/* Load settings into the holder. */
m_settings_holder.LoadSettings();
/* Print our beacon response. */
util::SNPrintf(m_beacon_response, sizeof(m_beacon_response), BeaconPacketResponseTemplate,
m_settings_holder.GetSpec(),
connection,
m_settings_holder.GetHardwareType(),
m_settings_holder.GetTargetName(),
m_settings_holder.GetSerialNumber(),
m_settings_holder.GetFirmwareVersion(),
ProtocolVersion
);
}
void HtcctrlService::UpdateInformationBody(const char *status) {
util::SNPrintf(m_information_body, sizeof(m_information_body), "{\r\n \"Status\" : \"%s\"\r\n}\r\n", status);
}
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void HtcctrlService::SetDriverType(impl::DriverType driver_type) {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Update our beacon response. */
this->UpdateBeaconResponse(this->GetConnectionType(driver_type));
}
Result HtcctrlService::CheckReceivedHeader(const HtcctrlPacketHeader &header) const {
/* Check the packet signature. */
AMS_ASSERT(header.signature == HtcctrlSignature);
/* Validate version. */
R_UNLESS(header.version == 1, htclow::ResultProtocolError());
/* Switch on the packet type. */
switch (header.packet_type) {
case HtcctrlPacketType_ConnectFromHost:
case HtcctrlPacketType_SuspendFromHost:
case HtcctrlPacketType_ResumeFromHost:
case HtcctrlPacketType_DisconnectFromHost:
case HtcctrlPacketType_BeaconQuery:
R_UNLESS(header.body_size == 0, htclow::ResultProtocolError());
break;
case HtcctrlPacketType_ReadyFromHost:
R_UNLESS(0 <= header.body_size && header.body_size <= sizeof(HtcctrlPacketBody), htclow::ResultProtocolError());
break;
default:
return htclow::ResultProtocolError();
}
return ResultSuccess();
}
Result HtcctrlService::ProcessReceivePacket(const HtcctrlPacketHeader &header, const void *body, size_t body_size) {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
switch (header.packet_type) {
case HtcctrlPacketType_ConnectFromHost:
return this->ProcessReceiveConnectPacket();
case HtcctrlPacketType_ReadyFromHost:
return this->ProcessReceiveReadyPacket(body, body_size);
case HtcctrlPacketType_SuspendFromHost:
return this->ProcessReceiveSuspendPacket();
case HtcctrlPacketType_ResumeFromHost:
return this->ProcessReceiveResumePacket();
case HtcctrlPacketType_DisconnectFromHost:
return this->ProcessReceiveDisconnectPacket();
case HtcctrlPacketType_BeaconQuery:
return this->ProcessReceiveBeaconQueryPacket();
default:
return this->ProcessReceiveUnexpectedPacket();
}
}
Result HtcctrlService::ProcessReceiveConnectPacket() {
/* Try to transition to sent connect state. */
if (R_FAILED(this->SetState(HtcctrlState_SentConnectFromHost))) {
/* We couldn't transition to sent connect. */
return this->ProcessReceiveUnexpectedPacket();
}
/* Send a connect packet. */
m_send_buffer.AddPacket(m_packet_factory->MakeConnectPacket(m_beacon_response, util::Strnlen(m_beacon_response, sizeof(m_beacon_response)) + 1));
/* Signal our event. */
m_event.Signal();
return ResultSuccess();
}
Result HtcctrlService::ProcessReceiveReadyPacket(const void *body, size_t body_size) {
/* Update our service channels. */
this->UpdateServiceChannels(body, body_size);
/* Check that our version is correct. */
if (m_version < ProtocolVersion) {
return this->ProcessReceiveUnexpectedPacket();
}
/* Set our version. */
m_version = ProtocolVersion;
m_mux->SetVersion(m_version);
/* Set our state. */
if (R_FAILED(this->SetState(HtcctrlState_SentReadyFromHost))) {
return this->ProcessReceiveUnexpectedPacket();
}
/* Ready ourselves. */
this->TryReadyInternal();
return ResultSuccess();
}
Result HtcctrlService::ProcessReceiveSuspendPacket() {
/* Try to set our state to enter sleep. */
if (R_FAILED(this->SetState(HtcctrlState_EnterSleep))) {
/* We couldn't transition to sleep. */
return this->ProcessReceiveUnexpectedPacket();
}
return ResultSuccess();
}
Result HtcctrlService::ProcessReceiveResumePacket() {
/* If our state is sent-resume, change to readied. */
if (m_state_machine->GetHtcctrlState() != HtcctrlState_SentResumeFromTarget || R_FAILED(this->SetState(HtcctrlState_Ready))) {
/* We couldn't perform a valid resume transition. */
return this->ProcessReceiveUnexpectedPacket();
}
return ResultSuccess();
}
Result HtcctrlService::ProcessReceiveDisconnectPacket() {
/* Set our state. */
R_TRY(this->SetState(HtcctrlState_Disconnected));
return ResultSuccess();
}
Result HtcctrlService::ProcessReceiveBeaconQueryPacket() {
/* Send a beacon response packet. */
m_send_buffer.AddPacket(m_packet_factory->MakeBeaconResponsePacket(m_beacon_response, util::Strnlen(m_beacon_response, sizeof(m_beacon_response)) + 1));
/* Signal our event. */
m_event.Signal();
return ResultSuccess();
}
Result HtcctrlService::ProcessReceiveUnexpectedPacket() {
/* Set our state. */
R_TRY(this->SetState(HtcctrlState_Error));
/* Send a disconnection packet. */
m_send_buffer.AddPacket(m_packet_factory->MakeDisconnectPacket());
/* Signal our event. */
m_event.Signal();
/* Return unexpected packet error. */
return htclow::ResultHtcctrlReceiveUnexpectedPacket();
}
void HtcctrlService::ProcessSendConnectPacket() {
/* Set our state. */
const Result result = this->SetState(HtcctrlState_Connected);
R_ASSERT(result);
}
void HtcctrlService::ProcessSendReadyPacket() {
/* Set our state. */
if (m_state_machine->GetHtcctrlState() == HtcctrlState_SentReadyFromHost) {
const Result result = this->SetState(HtcctrlState_Ready);
R_ASSERT(result);
}
/* Update channel states. */
m_mux->UpdateChannelState();
}
void HtcctrlService::ProcessSendSuspendPacket() {
/* Set our state. */
const Result result = this->SetState(HtcctrlState_SentSuspendFromTarget);
R_ASSERT(result);
}
void HtcctrlService::ProcessSendResumePacket() {
/* Set our state. */
const Result result = this->SetState(HtcctrlState_SentResumeFromTarget);
R_ASSERT(result);
}
void HtcctrlService::ProcessSendDisconnectPacket() {
/* Set our state. */
const Result result = this->SetState(HtcctrlState_Disconnected);
R_ASSERT(result);
}
void HtcctrlService::UpdateServiceChannels(const void *body, size_t body_size) {
/* Copy the packet body to our member. */
std::memcpy(m_service_channels_packet, body, body_size);
/* Parse service channels. */
impl::ChannelInternalType channels[10];
int num_channels;
s16 version = m_version;
ctrl::ParseServiceChannel(std::addressof(version), channels, std::addressof(num_channels), util::size(channels), m_service_channels_packet, body_size);
/* Update version. */
m_version = version;
/* Notify state machine of supported channels. */
m_state_machine->NotifySupportedServiceChannels(channels, num_channels);
}
void HtcctrlService::TryReadyInternal() {
/* If we can send ready, do so. */
if (m_state_machine->IsPossibleToSendReady()) {
/* Print the channels. */
char channel_str[0x100];
this->PrintServiceChannels(channel_str, sizeof(channel_str));
/* Send a ready packet. */
m_send_buffer.AddPacket(m_packet_factory->MakeReadyPacket(channel_str, util::Strnlen(channel_str, sizeof(channel_str)) + 1));
/* Signal our event. */
m_event.Signal();
/* Set connecting checked in state machine. */
m_state_machine->SetConnectingChecked();
}
}
bool HtcctrlService::QuerySendPacket(HtcctrlPacketHeader *header, HtcctrlPacketBody *body, int *out_body_size) {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
return m_send_buffer.QueryNextPacket(header, body, out_body_size);
}
void HtcctrlService::RemovePacket(const HtcctrlPacketHeader &header) {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Remove the packet from our buffer. */
m_send_buffer.RemovePacket(header);
/* Switch on the packet type. */
switch (header.packet_type) {
case HtcctrlPacketType_ConnectFromTarget:
this->ProcessSendConnectPacket();
break;
case HtcctrlPacketType_ReadyFromTarget:
this->ProcessSendReadyPacket();
break;
case HtcctrlPacketType_SuspendFromTarget:
this->ProcessSendSuspendPacket();
break;
case HtcctrlPacketType_ResumeFromTarget:
this->ProcessSendResumePacket();
break;
case HtcctrlPacketType_DisconnectFromTarget:
this->ProcessSendDisconnectPacket();
break;
case HtcctrlPacketType_BeaconResponse:
case HtcctrlPacketType_InformationFromTarget:
break;
default:
AMS_ABORT("Send unsupported packet 0x%04x\n", static_cast<u32>(header.packet_type));
}
}
void HtcctrlService::TryReady() {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
this->TryReadyInternal();
}
void HtcctrlService::Disconnect() {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
this->DisconnectInternal();
}
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void HtcctrlService::DisconnectInternal() {
/* Disconnect, if we need to. */
if (m_state_machine->IsDisconnectionNeeded()) {
/* Send a disconnect packet. */
m_send_buffer.AddPacket(m_packet_factory->MakeDisconnectPacket());
/* Signal our event. */
m_event.Signal();
/* Wait for us to be disconnected. */
while (!m_state_machine->IsDisconnected()) {
m_condvar.Wait(m_mutex);
}
}
}
void HtcctrlService::Resume() {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Send resume packet, if we can. */
if (const auto state = m_state_machine->GetHtcctrlState(); state == HtcctrlState_Sleep || state == HtcctrlState_ExitSleep) {
/* Send a resume packet. */
m_send_buffer.AddPacket(m_packet_factory->MakeResumePacket());
/* Signal our event. */
m_event.Signal();
}
}
void HtcctrlService::Suspend() {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* If we can, perform a suspend. */
if (m_state_machine->GetHtcctrlState() == HtcctrlState_Ready) {
/* Send a suspend packet. */
m_send_buffer.AddPacket(m_packet_factory->MakeSuspendPacket());
/* Signal our event. */
m_event.Signal();
/* Wait for our state to transition. */
for (auto state = m_state_machine->GetHtcctrlState(); state == HtcctrlState_Ready || state == HtcctrlState_SentSuspendFromTarget; state = m_state_machine->GetHtcctrlState()) {
m_condvar.Wait(m_mutex);
}
} else {
/* Otherwise, just disconnect. */
this->DisconnectInternal();
}
}
void HtcctrlService::NotifyAwake() {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Update our information. */
this->UpdateInformationBody("Awake");
/* Send information to host. */
this->SendInformation();
}
void HtcctrlService::NotifyAsleep() {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
/* Update our information. */
this->UpdateInformationBody("Asleep");
/* Send information to host. */
this->SendInformation();
}
void HtcctrlService::SendInformation() {
/* If we need information, send information. */
if (m_state_machine->IsInformationNeeded()) {
/* Send an information packet. */
m_send_buffer.AddPacket(m_packet_factory->MakeInformationPacket(m_information_body, util::Strnlen(m_information_body, sizeof(m_information_body)) + 1));
/* Signal our event. */
m_event.Signal();
}
}
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Result HtcctrlService::NotifyDriverConnected() {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
if (m_state_machine->GetHtcctrlState() == HtcctrlState_Sleep) {
R_TRY(this->SetState(HtcctrlState_ExitSleep));
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} else {
R_TRY(this->SetState(HtcctrlState_DriverConnected));
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}
return ResultSuccess();
}
Result HtcctrlService::NotifyDriverDisconnected() {
/* Lock ourselves. */
std::scoped_lock lk(m_mutex);
if (m_state_machine->GetHtcctrlState() == HtcctrlState_EnterSleep) {
R_TRY(this->SetState(HtcctrlState_Sleep));
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} else {
R_TRY(this->SetState(HtcctrlState_DriverDisconnected));
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}
return ResultSuccess();
}
Result HtcctrlService::SetState(HtcctrlState state) {
/* Set the state. */
bool did_transition;
R_TRY(m_state_machine->SetHtcctrlState(std::addressof(did_transition), state));
/* Reflect the state transition, if one occurred. */
if (did_transition) {
this->ReflectState();
}
return ResultSuccess();
}
void HtcctrlService::ReflectState() {
/* If our connected status changed, update. */
if (m_state_machine->IsConnectedStatusChanged()) {
m_mux->UpdateChannelState();
}
/* If our sleeping status changed, update. */
if (m_state_machine->IsSleepingStatusChanged()) {
m_mux->UpdateMuxState();
}
/* Broadcast our state transition. */
m_condvar.Broadcast();
}
void HtcctrlService::PrintServiceChannels(char *dst, size_t dst_size) {
size_t ofs = 0;
ofs += util::SNPrintf(dst + ofs, dst_size - ofs, "{\r\n \"Chan\" : [\r\n \"%d:%d:%d\"", static_cast<int>(ServiceChannels[0].module_id), ServiceChannels[0].reserved, static_cast<int>(ServiceChannels[0].channel_id));
for (size_t i = 1; i < util::size(ServiceChannels); ++i) {
ofs += util::SNPrintf(dst + ofs, dst_size - ofs, ",\r\n \"%d:%d:%d\"", static_cast<int>(ServiceChannels[i].module_id), ServiceChannels[i].reserved, static_cast<int>(ServiceChannels[i].channel_id));
}
ofs += util::SNPrintf(dst + ofs, dst_size - ofs, "\r\n],\r\n \"Prot\" : %d\r\n}\r\n", ProtocolVersion);
}
}