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/* ========================================
Copyright (C) 2024-2025, Amlal El Mahrouss, licensed under the Apache 2.0 license.
======================================== */
#include <KernelKit/KPC.h>
#include <KernelKit/ProcessScheduler.h>
#include <NetworkKit/IPC.h>
namespace Kernel {
/***********************************************************************************/
/// @internal internal use for IPC system only.
/// @brief The internal sanitize function.
/***********************************************************************************/
Bool ipc_int_sanitize_packet(IPC_MSG* pckt) {
auto endian = RTL_ENDIAN(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;
}
/***********************************************************************************/
/// @brief Sanitize packet function
/// @retval true packet is correct.
/// @retval false packet is incorrect and process has crashed.
/***********************************************************************************/
Bool ipc_sanitize_packet(IPC_MSG* pckt) {
if (!pckt || !ipc_int_sanitize_packet(pckt)) {
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 IPC_MSG** pckt_in) {
// don't act if it's not even valid.
if (!pckt_in) return false;
if (!*pckt_in) *pckt_in = new IPC_MSG();
MUST_PASS(*pckt_in);
if (*pckt_in) {
const auto endianess = RTL_ENDIAN((*pckt_in), ((Char*) (*pckt_in))[0]);
(*pckt_in)->IpcHeaderMagic = kIPCHeaderMagic;
(*pckt_in)->IpcEndianess = static_cast<UInt8>(endianess);
(*pckt_in)->IpcPacketSize = sizeof(IPC_MSG);
(*pckt_in)->IpcTo.UserProcessID = 0;
(*pckt_in)->IpcTo.UserProcessTeam = 0;
(*pckt_in)->IpcFrom.UserProcessID = 0;
(*pckt_in)->IpcFrom.UserProcessTeam = 0;
(*pckt_in)->IpcLock = kIPCLockFree;
return Yes;
}
return No;
}
/***********************************************************************************/
/// @brief Pass message from **src** to **target**
/// @param src Source message.
/// @param target Target message.
/***********************************************************************************/
Bool IPC_MSG::Pass(IPC_MSG* src, IPC_MSG* target) noexcept {
if (src && target && (target != src)) {
if (src->IpcMsgSz > target->IpcMsgSz) return No;
if (target->IpcMsgSz > src->IpcMsgSz) return No;
auto timeout = 0U;
const auto kLimitTimeout = 1000000U;
while ((target->IpcLock % kIPCLockUsed) != 0) {
if (timeout > kLimitTimeout) {
return No;
}
}
++target->IpcLock;
rt_copy_memory_safe(src->IpcData, target->IpcData, src->IpcMsgSz, kIPCMsgSize);
--target->IpcLock;
return Yes;
}
return No;
}
} // namespace Kernel
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