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/* -------------------------------------------
Copyright (C) 2024, Theater Quality Inc, all rights reserved.
------------------------------------------- */
#include <NetworkKit/IPC.h>
#include <KernelKit/LPC.h>
#include <KernelKit/UserProcessScheduler.h>
using namespace Kernel;
/// @internal
/// @brief The internal sanitize function.
Bool ipc_int_sanitize_packet(IPCMessage* pckt)
{
auto endian = rtl_deduce_endianess(pckt, ((Char*)pckt)[0]);
switch (endian)
{
case Endian::kEndianBig: {
if (pckt->IpcEndianess == kIPCLittleEndian)
goto ipc_check_failed;
break;
}
case Endian::kEndianLittle: {
if (pckt->IpcEndianess == kIPCBigEndian)
goto ipc_check_failed;
break;
}
case Endian::kEndianMixed: {
if (pckt->IpcEndianess == kIPCMixedEndian)
goto ipc_check_failed;
break;
}
default:
goto ipc_check_failed;
}
if (pckt->IpcFrom == pckt->IpcTo ||
pckt->IpcPacketSize > kIPCMsgSize)
{
goto ipc_check_failed;
}
return pckt->IpcPacketSize > 1 && pckt->IpcHeaderMagic == kIPCHeaderMagic;
ipc_check_failed:
err_local_get() = kErrorIPC;
return false;
}
namespace Kernel
{
/// @brief Sanitize packet function
/// @retval true packet is correct.
/// @retval false packet is incorrect and process has crashed.
Bool ipc_sanitize_packet(IPCMessage* pckt)
{
if (!pckt ||
!ipc_int_sanitize_packet(pckt))
{
UserProcessScheduler::The().GetCurrentProcess().Leak().Crash();
return false;
}
return true;
}
/// @brief Construct packet function
/// @retval true packet is correct.
/// @retval false packet is incorrect and process has crashed.
Bool ipc_construct_packet(_Output IPCMessage** pckt_in)
{
// don't do anything if it's valid already.
if (*pckt_in)
return true;
// crash process if the packet pointer of pointer is NULL.
if (!pckt_in)
{
UserProcessScheduler::The().GetCurrentProcess().Leak().Crash();
return false;
}
*pckt_in = new IPCMessage();
if (*pckt_in)
{
auto endian = rtl_deduce_endianess((*pckt_in), ((Char*)(*pckt_in))[0]);
(*pckt_in)->IpcHeaderMagic = kIPCHeaderMagic;
(*pckt_in)->IpcEndianess = static_cast<UInt8>(endian);
(*pckt_in)->IpcPacketSize = sizeof(IPCMessage);
(*pckt_in)->IpcTo.UserProcessID = 0;
(*pckt_in)->IpcTo.UserProcessTeam = 0;
(*pckt_in)->IpcFrom.UserProcessID = Kernel::UserProcessScheduler::The().GetCurrentProcess().Leak().ProcessId;
(*pckt_in)->IpcFrom.UserProcessTeam = Kernel::UserProcessScheduler::The().CurrentTeam().mTeamId;
return Yes;
}
return No;
}
} // namespace Kernel
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