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pcsx2/pcsx2/IPC.cpp

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/* PCSX2 - PS2 Emulator for PCs
* Copyright (C) 2002-2020 PCSX2 Dev Team
*
* PCSX2 is free software: you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* PCSX2 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 PCSX2.
* If not, see <http://www.gnu.org/licenses/>.
*/
#include "PrecompiledHeader.h"
#include <stdio.h>
#include <stdlib.h>
#include <thread>
#include <sys/types.h>
#if _WIN32
#define read_portable(a, b, c) (recv(a, b, c, 0))
#define write_portable(a, b, c) (send(a, b, c, 0))
#define close_portable(a) (closesocket(a))
#define bzero(b, len) (memset((b), '\0', (len)), (void)0)
#include <WinSock2.h>
#include <windows.h>
#else
#define read_portable(a, b, c) (read(a, b, c))
#define write_portable(a, b, c) (write(a, b, c))
#define close_portable(a) (close(a))
#include <sys/socket.h>
#include <sys/un.h>
#endif
#include "Common.h"
#include "Memory.h"
#include "gui/AppSaveStates.h"
#include "gui/AppCoreThread.h"
#include "System/SysThreads.h"
#include "svnrev.h"
#include "IPC.h"
SocketIPC::SocketIPC(SysCoreThread* vm, unsigned int slot)
: pxThread("IPC_Socket")
{
#ifdef _WIN32
WSADATA wsa;
struct sockaddr_in server;
if (WSAStartup(MAKEWORD(2, 2), &wsa) != 0)
{
Console.WriteLn(Color_Red, "IPC: Cannot initialize winsock! Shutting down...");
return;
}
m_sock = socket(AF_INET, SOCK_STREAM, 0);
if ((m_sock == INVALID_SOCKET) || slot > 65536)
{
Console.WriteLn(Color_Red, "IPC: Cannot open socket! Shutting down...");
return;
}
// yes very good windows s/sun/sin/g sure is fine
server.sin_family = AF_INET;
// localhost only
server.sin_addr.s_addr = inet_addr("127.0.0.1");
server.sin_port = htons(slot);
if (bind(m_sock, (struct sockaddr*)&server, sizeof(server)) == SOCKET_ERROR)
{
Console.WriteLn(Color_Red, "IPC: Error while binding to socket! Shutting down...");
return;
}
#else
char* runtime_dir = nullptr;
#ifdef __APPLE__
runtime_dir = std::getenv("TMPDIR");
#else
runtime_dir = std::getenv("XDG_RUNTIME_DIR");
#endif
// fallback in case macOS or other OSes don't implement the XDG base
// spec
if (runtime_dir == nullptr)
m_socket_name = "/tmp/" IPC_EMULATOR_NAME ".sock";
else
{
m_socket_name = runtime_dir;
m_socket_name += "/" IPC_EMULATOR_NAME ".sock";
}
if (slot != IPC_DEFAULT_SLOT)
m_socket_name += "." + std::to_string(slot);
struct sockaddr_un server;
m_sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (m_sock < 0)
{
Console.WriteLn(Color_Red, "IPC: Cannot open socket! Shutting down...");
return;
}
server.sun_family = AF_UNIX;
strcpy(server.sun_path, m_socket_name.c_str());
// we unlink the socket so that when releasing this thread the socket gets
// freed even if we didn't close correctly the loop
unlink(m_socket_name.c_str());
if (bind(m_sock, (struct sockaddr*)&server, sizeof(struct sockaddr_un)))
{
Console.WriteLn(Color_Red, "IPC: Error while binding to socket! Shutting down...");
return;
}
#endif
// maximum queue of 4096 commands before refusing, approximated to the
// nearest legal value. We do not use SOMAXCONN as windows have this idea
// that a "reasonable" value is 5, which is not.
listen(m_sock, 4096);
// we save a handle of the main vm object
m_vm = vm;
// we start the thread
Start();
}
char* SocketIPC::MakeOkIPC(char* ret_buffer, uint32_t size = 5)
{
ToArray<uint32_t>(ret_buffer, size, 0);
ret_buffer[4] = IPC_OK;
return ret_buffer;
}
char* SocketIPC::MakeFailIPC(char* ret_buffer, uint32_t size = 5)
{
ToArray<uint32_t>(ret_buffer, size, 0);
ret_buffer[4] = IPC_FAIL;
return ret_buffer;
}
int SocketIPC::StartSocket()
{
m_msgsock = accept(m_sock, 0, 0);
if (m_msgsock == -1)
{
// everything else is non recoverable in our scope
// we also mark as recoverable socket errors where it would block a
// non blocking socket, even though our socket is blocking, in case
// we ever have to implement a non blocking socket.
#ifdef _WIN32
int errno_w = WSAGetLastError();
if (!(errno_w == WSAECONNRESET || errno_w == WSAEINTR || errno_w == WSAEINPROGRESS || errno_w == WSAEMFILE || errno_w == WSAEWOULDBLOCK))
{
#else
if (!(errno == ECONNABORTED || errno == EINTR || errno == EAGAIN || errno == EWOULDBLOCK))
{
#endif
fprintf(stderr, "IPC: An unrecoverable error happened! Shutting down...\n");
m_end = true;
return -1;
}
}
return 0;
}
void SocketIPC::ExecuteTaskInThread()
{
m_end = false;
// we allocate once buffers to not have to do mallocs for each IPC
// request, as malloc is expansive when we optimize for µs.
m_ret_buffer = new char[MAX_IPC_RETURN_SIZE];
m_ipc_buffer = new char[MAX_IPC_SIZE];
if (StartSocket() < 0)
return;
while (true)
{
// either int or ssize_t depending on the platform, so we have to
// use a bunch of auto
auto receive_length = 0;
auto end_length = 4;
// while we haven't received the entire packet, maybe due to
// socket datagram splittage, we continue to read
while (receive_length < end_length)
{
auto tmp_length = read_portable(m_msgsock, &m_ipc_buffer[receive_length], MAX_IPC_SIZE - receive_length);
// we recreate the socket if an error happens
if (tmp_length <= 0)
{
receive_length = 0;
if (StartSocket() < 0)
return;
break;
}
receive_length += tmp_length;
// if we got at least the final size then update
if (end_length == 4 && receive_length >= 4)
{
end_length = FromArray<u32>(m_ipc_buffer, 0);
// we'd like to avoid a client trying to do OOB
if (end_length > MAX_IPC_SIZE || end_length < 4)
{
receive_length = 0;
break;
}
}
}
SocketIPC::IPCBuffer res;
// we remove 4 bytes to get the message size out of the IPC command
// size in ParseCommand.
// also, if we got a failed command, let's reset the state so we don't
// end up deadlocking by getting out of sync, eg when a client
// disconnects
if (receive_length != 0)
{
res = ParseCommand(&m_ipc_buffer[4], m_ret_buffer, (u32)end_length - 4);
// if we cannot send back our answer restart the socket
if (write_portable(m_msgsock, res.buffer, res.size) < 0)
{
if (StartSocket() < 0)
return;
}
}
}
return;
}
SocketIPC::~SocketIPC()
{
m_end = true;
#ifdef _WIN32
WSACleanup();
#else
unlink(m_socket_name.c_str());
#endif
close_portable(m_sock);
close_portable(m_msgsock);
delete[] m_ret_buffer;
delete[] m_ipc_buffer;
// destroy the thread
try
{
pxThread::Cancel();
}
DESTRUCTOR_CATCHALL
}
SocketIPC::IPCBuffer SocketIPC::ParseCommand(char* buf, char* ret_buffer, u32 buf_size)
{
u32 ret_cnt = 5;
u32 buf_cnt = 0;
while (buf_cnt < buf_size)
{
if (!SafetyChecks(buf_cnt, 1, ret_cnt, 0, buf_size))
return IPCBuffer{5, MakeFailIPC(ret_buffer)};
buf_cnt++;
// example IPC messages: MsgRead/Write
// refer to the client doc for more info on the format
// IPC Message event (1 byte)
// | Memory address (4 byte)
// | | argument (VLE)
// | | |
// format: XX YY YY YY YY ZZ ZZ ZZ ZZ
// reply code: 00 = OK, FF = NOT OK
// | return value (VLE)
// | |
// reply: XX ZZ ZZ ZZ ZZ
switch ((IPCCommand)buf[buf_cnt - 1])
{
case MsgRead8:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 4, ret_cnt, 1, buf_size))
goto error;
const u32 a = FromArray<u32>(&buf[buf_cnt], 0);
const u8 res = memRead8(a);
ToArray(ret_buffer, res, ret_cnt);
ret_cnt += 1;
buf_cnt += 4;
break;
}
case MsgRead16:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 4, ret_cnt, 2, buf_size))
goto error;
const u32 a = FromArray<u32>(&buf[buf_cnt], 0);
const u16 res = memRead16(a);
ToArray(ret_buffer, res, ret_cnt);
ret_cnt += 2;
buf_cnt += 4;
break;
}
case MsgRead32:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 4, ret_cnt, 4, buf_size))
goto error;
const u32 a = FromArray<u32>(&buf[buf_cnt], 0);
const u32 res = memRead32(a);
ToArray(ret_buffer, res, ret_cnt);
ret_cnt += 4;
buf_cnt += 4;
break;
}
case MsgRead64:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 4, ret_cnt, 8, buf_size))
goto error;
const u32 a = FromArray<u32>(&buf[buf_cnt], 0);
u64 res = 0;
memRead64(a, &res);
ToArray(ret_buffer, res, ret_cnt);
ret_cnt += 8;
buf_cnt += 4;
break;
}
case MsgWrite8:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 1 + 4, ret_cnt, 0, buf_size))
goto error;
const u32 a = FromArray<u32>(&buf[buf_cnt], 0);
memWrite8(a, FromArray<u8>(&buf[buf_cnt], 4));
buf_cnt += 5;
break;
}
case MsgWrite16:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 2 + 4, ret_cnt, 0, buf_size))
goto error;
const u32 a = FromArray<u32>(&buf[buf_cnt], 0);
memWrite16(a, FromArray<u16>(&buf[buf_cnt], 4));
buf_cnt += 6;
break;
}
case MsgWrite32:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 4 + 4, ret_cnt, 0, buf_size))
goto error;
const u32 a = FromArray<u32>(&buf[buf_cnt], 0);
memWrite32(a, FromArray<u32>(&buf[buf_cnt], 4));
buf_cnt += 8;
break;
}
case MsgWrite64:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 8 + 4, ret_cnt, 0, buf_size))
goto error;
const u32 a = FromArray<u32>(&buf[buf_cnt], 0);
memWrite64(a, FromArray<u64>(&buf[buf_cnt], 4));
buf_cnt += 12;
break;
}
case MsgVersion:
{
char version[256] = {};
sprintf(version, "PCSX2 %u.%u.%u-%lld %s", PCSX2_VersionHi, PCSX2_VersionMid, PCSX2_VersionLo, SVN_REV, SVN_MODS ? "(modded)" : "");
version[255] = 0x00;
if (!SafetyChecks(buf_cnt, 0, ret_cnt, 256, buf_size))
goto error;
memcpy(&ret_buffer[ret_cnt], version, 256);
ret_cnt += 256;
break;
}
case MsgSaveState:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 1, ret_cnt, 0, buf_size))
goto error;
StateCopy_SaveToSlot(FromArray<u8>(&buf[buf_cnt], 0));
buf_cnt += 1;
break;
}
case MsgLoadState:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 1, ret_cnt, 0, buf_size))
goto error;
StateCopy_LoadFromSlot(FromArray<u8>(&buf[buf_cnt], 0), false);
buf_cnt += 1;
break;
}
case MsgTitle:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 0, ret_cnt, 256, buf_size))
goto error;
char title[256] = {};
sprintf(title, "%s", GameInfo::gameName.ToUTF8().data());
title[255] = 0x00;
memcpy(&ret_buffer[ret_cnt], title, 256);
ret_cnt += 256;
break;
}
case MsgID:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 0, ret_cnt, 256, buf_size))
goto error;
char id[256] = {};
sprintf(id, "%s", GameInfo::gameSerial.ToUTF8().data());
id[255] = 0x00;
memcpy(&ret_buffer[ret_cnt], id, 256);
ret_cnt += 256;
break;
}
case MsgUUID:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 0, ret_cnt, 256, buf_size))
goto error;
char uuid[256] = {};
sprintf(uuid, "%s", GameInfo::gameCRC.ToUTF8().data());
uuid[255] = 0x00;
memcpy(&ret_buffer[ret_cnt], uuid, 256);
ret_cnt += 256;
break;
}
case MsgGameVersion:
{
if (!m_vm->HasActiveMachine())
goto error;
if (!SafetyChecks(buf_cnt, 0, ret_cnt, 256, buf_size))
goto error;
char version[256] = {};
sprintf(version, "%s", GameInfo::gameVersion.ToUTF8().data());
version[255] = 0x00;
memcpy(&ret_buffer[ret_cnt], version, 256);
ret_cnt += 256;
break;
}
case MsgStatus:
{
if (!SafetyChecks(buf_cnt, 0, ret_cnt, 4, buf_size))
goto error;
EmuStatus status;
switch (m_vm->HasActiveMachine())
{
case true:
if (GetCoreThread().IsClosing())
status = Paused;
else
status = Running;
break;
case false:
status = Shutdown;
break;
}
ToArray(ret_buffer, status, ret_cnt);
ret_cnt += 4;
break;
}
default:
{
error:
return IPCBuffer{5, MakeFailIPC(ret_buffer)};
}
}
}
return IPCBuffer{(int)ret_cnt, MakeOkIPC(ret_buffer, ret_cnt)};
}
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