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Atmosphere/libraries/libstratosphere/source/htclow/driver/htclow_socket_driver.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_socket_driver.hpp"
#include "htclow_socket_discovery_util.hpp"
namespace ams::htclow::driver {
Result SocketDriver::ConnectThread() {
/* Do auto connect, if we should. */
if (m_auto_connect_reserved) {
this->DoAutoConnect();
}
/* Get the socket's name. */
socket::SockAddrIn sockaddr;
socket::SockLenT sockaddr_len = sizeof(sockaddr);
R_UNLESS(socket::GetSockName(m_server_socket, reinterpret_cast<socket::SockAddr *>(std::addressof(sockaddr)), std::addressof(sockaddr_len)) == 0, htclow::ResultSocketGetSockNameError());
/* Accept. */
m_discovery_manager.OnSocketAcceptBegin(sockaddr.sin_port);
sockaddr_len = sizeof(m_server_sockaddr);
const auto client_desc = socket::Accept(m_server_socket, reinterpret_cast<socket::SockAddr *>(std::addressof(m_server_sockaddr)), std::addressof(sockaddr_len));
m_discovery_manager.OnSocketAcceptEnd();
/* Check accept result. */
R_UNLESS(client_desc >= 0, htclow::ResultSocketAcceptError());
/* Setup client socket. */
R_TRY(this->SetupClientSocket(client_desc));
return ResultSuccess();
}
Result SocketDriver::CreateServerSocket() {
/* Check that we don't have a server socket. */
AMS_ASSERT(!m_server_socket_valid);
/* Create the socket. */
const auto desc = socket::SocketExempt(socket::Family::Af_Inet, socket::Type::Sock_Stream, socket::Protocol::IpProto_Tcp);
R_UNLESS(desc != -1, htclow::ResultSocketSocketExemptError());
/* Be sure that we close the socket if we don't succeed. */
auto socket_guard = SCOPE_GUARD { socket::Close(desc); };
/* Create sockaddr for our socket. */
const socket::SockAddrIn sockaddr = {
.sin_len = 0,
.sin_family = socket::Family::Af_Inet,
.sin_port = socket::InetHtons(20180),
.sin_addr = { socket::InetHtonl(0) },
};
/* Enable local address reuse. */
{
u32 enable = 1;
const auto res = socket::SetSockOpt(desc, socket::Level::Sol_Socket, socket::Option::So_ReuseAddr, std::addressof(enable), sizeof(enable));
AMS_ABORT_UNLESS(res == 0);
}
/* Bind the socket. */
const auto bind_res = socket::Bind(desc, reinterpret_cast<const socket::SockAddr *>(std::addressof(sockaddr)), sizeof(sockaddr));
R_UNLESS(bind_res == 0, htclow::ResultSocketBindError());
/* Listen on the socket. */
const auto listen_res = socket::Listen(desc, 1);
R_UNLESS(listen_res == 0, htclow::ResultSocketListenError());
/* We succeeded. */
socket_guard.Cancel();
m_server_socket = desc;
m_server_socket_valid = true;
return ResultSuccess();
}
void SocketDriver::DestroyServerSocket() {
if (m_server_socket_valid) {
socket::Shutdown(m_server_socket, socket::ShutdownMethod::Shut_RdWr);
socket::Close(m_server_socket);
m_server_socket_valid = false;
}
}
Result SocketDriver::SetupClientSocket(s32 desc) {
std::scoped_lock lk(m_mutex);
/* Check that we don't have a client socket. */
AMS_ASSERT(!m_client_socket_valid);
/* Be sure that we close the socket if we don't succeed. */
auto socket_guard = SCOPE_GUARD { socket::Close(desc); };
/* Enable debug logging for the socket. */
u32 debug = 1;
const auto res = socket::SetSockOpt(desc, socket::Level::Sol_Tcp, socket::Option::So_Debug, std::addressof(debug), sizeof(debug));
R_UNLESS(res >= 0, htclow::ResultSocketSetSockOptError());
/* We succeeded. */
socket_guard.Cancel();
m_client_socket = desc;
m_client_socket_valid = true;
return ResultSuccess();
}
bool SocketDriver::IsAutoConnectReserved() {
return m_auto_connect_reserved;
}
void SocketDriver::ReserveAutoConnect() {
std::scoped_lock lk(m_mutex);
if (m_client_socket_valid) {
/* Save our client sockaddr. */
socket::SockLenT sockaddr_len = sizeof(m_saved_client_sockaddr);
if (socket::GetSockName(m_server_socket, reinterpret_cast<socket::SockAddr *>(std::addressof(m_saved_client_sockaddr)), std::addressof(sockaddr_len)) != 0) {
return;
}
/* Save our server sockaddr. */
m_saved_server_sockaddr = m_server_sockaddr;
/* Mark auto-connect reserved. */
m_auto_connect_reserved = true;
}
}
void SocketDriver::DoAutoConnect() {
/* Clear auto-connect reserved. */
m_auto_connect_reserved = false;
/* Create udb socket. */
const auto desc = socket::SocketExempt(socket::Family::Af_Inet, socket::Type::Sock_Dgram, socket::Protocol::IpProto_Udp);
if (desc == -1) {
return;
}
/* Clean up the desc when we're done. */
ON_SCOPE_EXIT { socket::Close(desc); };
/* Create auto-connect packet. */
char auto_connect_packet[0x120];
s32 len;
{
const socket::SockAddrIn sockaddr = {
.sin_family = socket::Family::Af_Inet,
.sin_port = m_saved_client_sockaddr.sin_port,
.sin_addr = m_saved_client_sockaddr.sin_addr,
};
len = htclow::driver::MakeAutoConnectIpv4RequestPacket(auto_connect_packet, sizeof(auto_connect_packet), sockaddr);
}
/* Send the auto-connect packet to the host on port 20181. */
const socket::SockAddrIn sockaddr = {
.sin_family = socket::Family::Af_Inet,
.sin_port = socket::InetHtons(20181),
.sin_addr = m_saved_server_sockaddr.sin_addr,
};
/* Send the auto-connect packet. */
socket::SendTo(desc, auto_connect_packet, len, socket::MsgFlag::MsgFlag_None, reinterpret_cast<const socket::SockAddr *>(std::addressof(sockaddr)), sizeof(sockaddr));
}
Result SocketDriver::Open() {
m_discovery_manager.OnDriverOpen();
return ResultSuccess();
}
void SocketDriver::Close() {
m_discovery_manager.OnDriverClose();
}
Result SocketDriver::Connect(os::EventType *event) {
/* Allocate a temporary thread stack. */
void *stack = m_allocator->Allocate(os::MemoryPageSize, os::ThreadStackAlignment);
ON_SCOPE_EXIT { m_allocator->Free(stack); };
/* Try to create a server socket. */
R_TRY(this->CreateServerSocket());
/* Prepare to run our connect thread. */
m_event.Clear();
/* Run our connect thread. */
{
/* Create the thread. */
os::ThreadType connect_thread;
R_ABORT_UNLESS(os::CreateThread(std::addressof(connect_thread), ConnectThreadEntry, this, stack, os::MemoryPageSize, AMS_GET_SYSTEM_THREAD_PRIORITY(htc, HtclowTcpServer)));
/* Set the thread's name. */
os::SetThreadNamePointer(std::addressof(connect_thread), AMS_GET_SYSTEM_THREAD_NAME(htc, HtclowTcpServer));
/* Start the thread. */
os::StartThread(std::addressof(connect_thread));
/* Check if we should cancel the connection. */
if (os::WaitAny(event, m_event.GetBase()) == 0) {
this->DestroyServerSocket();
}
/* Wait for the connect thread to finish. */
os::WaitThread(std::addressof(connect_thread));
/* Destroy the connection thread. */
os::DestroyThread(std::addressof(connect_thread));
/* Destroy the server socket. */
this->DestroyServerSocket();
}
/* Return our connection result. */
return m_connect_result;
}
void SocketDriver::Shutdown() {
std::scoped_lock lk(m_mutex);
/* Shut down our client socket, if we need to. */
if (m_client_socket_valid) {
socket::Shutdown(m_client_socket, socket::ShutdownMethod::Shut_RdWr);
socket::Close(m_client_socket);
m_client_socket_valid = 0;
}
}
Result SocketDriver::Send(const void *src, int src_size) {
/* Check the input size. */
R_UNLESS(src_size >= 0, htclow::ResultInvalidArgument());
/* Repeatedly send data until it's all sent. */
ssize_t cur_sent;
for (ssize_t sent = 0; sent < src_size; sent += cur_sent) {
cur_sent = socket::Send(m_client_socket, static_cast<const u8 *>(src) + sent, src_size - sent, socket::MsgFlag::MsgFlag_None);
R_UNLESS(cur_sent > 0, htclow::ResultSocketSendError());
}
return ResultSuccess();
}
Result SocketDriver::Receive(void *dst, int dst_size) {
/* Check the input size. */
R_UNLESS(dst_size >= 0, htclow::ResultInvalidArgument());
/* Repeatedly receive data until it's all sent. */
ssize_t cur_recv;
for (ssize_t received = 0; received < dst_size; received += cur_recv) {
cur_recv = socket::Recv(m_client_socket, static_cast<u8 *>(dst) + received, dst_size - received, socket::MsgFlag::MsgFlag_None);
R_UNLESS(cur_recv > 0, htclow::ResultSocketReceiveError());
}
return ResultSuccess();
}
void SocketDriver::CancelSendReceive() {
this->Shutdown();
}
void SocketDriver::Suspend() {
this->ReserveAutoConnect();
}
void SocketDriver::Resume() {
/* ... */
}
}