mirror of
https://github.com/akuker/RASCSI.git
synced 2024-06-28 05:29:33 +00:00
241e739d3a
- Memory management updates, more fixed Sonar issues * Replaced macros, fixed other sonar issues * Added const, replaced enum with a single value by constant * Updated object initializations * Fixed potential strncpy overflow reported by gcc 8.3
215 lines
5.8 KiB
C++
215 lines
5.8 KiB
C++
//---------------------------------------------------------------------------
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//
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// SCSI Target Emulator RaSCSI Reloaded
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// for Raspberry Pi
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//
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// Copyright (C) 2022 Uwe Seimet
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//
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//---------------------------------------------------------------------------
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#include "log.h"
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#include "rascsi_exceptions.h"
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#include "dispatcher.h"
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#include "primary_device.h"
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using namespace std;
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using namespace scsi_defs;
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PrimaryDevice::PrimaryDevice(const string& id) : ScsiPrimaryCommands(), Device(id)
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{
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// Mandatory SCSI primary commands
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dispatcher.AddCommand(eCmdTestUnitReady, "TestUnitReady", &PrimaryDevice::TestUnitReady);
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dispatcher.AddCommand(eCmdInquiry, "Inquiry", &PrimaryDevice::Inquiry);
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dispatcher.AddCommand(eCmdReportLuns, "ReportLuns", &PrimaryDevice::ReportLuns);
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// Optional commands used by all RaSCSI devices
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dispatcher.AddCommand(eCmdRequestSense, "RequestSense", &PrimaryDevice::RequestSense);
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}
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bool PrimaryDevice::Dispatch()
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{
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return dispatcher.Dispatch(this, ctrl->cmd[0]);
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}
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void PrimaryDevice::SetController(AbstractController *c)
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{
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controller = c;
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ctrl = controller->GetCtrl();
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}
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void PrimaryDevice::TestUnitReady()
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{
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CheckReady();
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EnterStatusPhase();
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}
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void PrimaryDevice::Inquiry()
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{
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// EVPD and page code check
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if ((ctrl->cmd[1] & 0x01) || ctrl->cmd[2]) {
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throw scsi_error_exception(sense_key::ILLEGAL_REQUEST, asc::INVALID_FIELD_IN_CDB);
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}
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vector<BYTE> buf = InquiryInternal();
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size_t allocation_length = ctrl->cmd[4] + (ctrl->cmd[3] << 8);
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if (allocation_length > buf.size()) {
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allocation_length = buf.size();
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}
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memcpy(ctrl->buffer, buf.data(), allocation_length);
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ctrl->length = (uint32_t)allocation_length;
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// Report if the device does not support the requested LUN
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if (int lun = controller->GetEffectiveLun(); !controller->HasDeviceForLun(lun)) {
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LOGTRACE("Reporting LUN %d for device ID %d as not supported", lun, GetId())
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// Signal that the requested LUN does not exist
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ctrl->buffer[0] |= 0x7f;
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}
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EnterDataInPhase();
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}
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void PrimaryDevice::ReportLuns()
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{
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int allocation_length = (ctrl->cmd[6] << 24) + (ctrl->cmd[7] << 16) + (ctrl->cmd[8] << 8) + ctrl->cmd[9];
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BYTE *buf = ctrl->buffer;
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memset(buf, 0, allocation_length < ctrl->bufsize ? allocation_length : ctrl->bufsize);
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int size = 0;
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// Only SELECT REPORT mode 0 is supported
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if (ctrl->cmd[2]) {
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throw scsi_error_exception(sense_key::ILLEGAL_REQUEST, asc::INVALID_FIELD_IN_CDB);
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}
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for (int lun = 0; lun < controller->GetMaxLuns(); lun++) {
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if (controller->HasDeviceForLun(lun)) {
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size += 8;
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buf[size + 7] = (BYTE)lun;
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}
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}
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buf[2] = (BYTE)(size >> 8);
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buf[3] = (BYTE)size;
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size += 8;
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ctrl->length = allocation_length < size ? allocation_length : size;
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EnterDataInPhase();
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}
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void PrimaryDevice::RequestSense()
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{
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int lun = controller->GetEffectiveLun();
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// Note: According to the SCSI specs the LUN handling for REQUEST SENSE non-existing LUNs do *not* result
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// in CHECK CONDITION. Only the Sense Key and ASC are set in order to signal the non-existing LUN.
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if (!controller->HasDeviceForLun(lun)) {
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// LUN 0 can be assumed to be present (required to call RequestSense() below)
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assert(controller->HasDeviceForLun(0));
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lun = 0;
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// Do not raise an exception here because the rest of the code must be executed
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controller->Error(sense_key::ILLEGAL_REQUEST, asc::INVALID_LUN);
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ctrl->status = 0x00;
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}
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vector<BYTE> buf = controller->GetDeviceForLun(lun)->HandleRequestSense();
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size_t allocation_length = ctrl->cmd[4];
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if (allocation_length > buf.size()) {
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allocation_length = buf.size();
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}
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memcpy(ctrl->buffer, buf.data(), allocation_length);
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ctrl->length = (uint32_t)allocation_length;
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EnterDataInPhase();
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}
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void PrimaryDevice::CheckReady()
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{
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// Not ready if reset
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if (IsReset()) {
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SetReset(false);
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LOGTRACE("%s Device in reset", __PRETTY_FUNCTION__)
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throw scsi_error_exception(sense_key::UNIT_ATTENTION, asc::POWER_ON_OR_RESET);
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}
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// Not ready if it needs attention
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if (IsAttn()) {
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SetAttn(false);
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LOGTRACE("%s Device in needs attention", __PRETTY_FUNCTION__)
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throw scsi_error_exception(sense_key::UNIT_ATTENTION, asc::NOT_READY_TO_READY_CHANGE);
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}
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// Return status if not ready
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if (!IsReady()) {
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LOGTRACE("%s Device not ready", __PRETTY_FUNCTION__)
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throw scsi_error_exception(sense_key::NOT_READY, asc::MEDIUM_NOT_PRESENT);
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}
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// Initialization with no error
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LOGTRACE("%s Device is ready", __PRETTY_FUNCTION__)
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}
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vector<BYTE> PrimaryDevice::HandleInquiry(device_type type, scsi_level level, bool is_removable) const
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{
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vector<BYTE> buf(0x1F + 5);
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// Basic data
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// buf[0] ... SCSI device type
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// buf[1] ... Bit 7: Removable/not removable
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// buf[2] ... SCSI compliance level of command system
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// buf[3] ... SCSI compliance level of Inquiry response
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// buf[4] ... Inquiry additional data
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buf[0] = (BYTE)type;
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buf[1] = is_removable ? 0x80 : 0x00;
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buf[2] = (BYTE)level;
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buf[3] = (BYTE)(level >= scsi_level::SCSI_2 ? scsi_level::SCSI_2 : scsi_level::SCSI_1_CCS);
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buf[4] = 0x1F;
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// Padded vendor, product, revision
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memcpy(&buf[8], GetPaddedName().c_str(), 28);
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return buf;
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}
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vector<BYTE> PrimaryDevice::HandleRequestSense() const
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{
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// Return not ready only if there are no errors
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if (!GetStatusCode() && !IsReady()) {
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throw scsi_error_exception(sense_key::NOT_READY, asc::MEDIUM_NOT_PRESENT);
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}
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// Set 18 bytes including extended sense data
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vector<BYTE> buf(18);
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// Current error
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buf[0] = 0x70;
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buf[2] = (BYTE)(GetStatusCode() >> 16);
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buf[7] = 10;
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buf[12] = (BYTE)(GetStatusCode() >> 8);
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buf[13] = (BYTE)GetStatusCode();
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LOGTRACE("%s Status $%02X, Sense Key $%02X, ASC $%02X",__PRETTY_FUNCTION__, ctrl->status, ctrl->buffer[2], ctrl->buffer[12])
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return buf;
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}
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bool PrimaryDevice::WriteByteSequence(BYTE *, uint32_t)
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{
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LOGERROR("%s Writing bytes is not supported by this device", __PRETTY_FUNCTION__)
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return false;
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}
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