RASCSI/cpp/devices/scsi_printer.cpp
2024-05-01 16:15:42 +09:00

239 lines
6.4 KiB
C++

//---------------------------------------------------------------------------
//
// SCSI Target Emulator PiSCSI
// for Raspberry Pi
//
// Copyright (C) 2022-2023 Uwe Seimet
//
// Implementation of a SCSI printer (see SCSI-2 specification for a command description)
//
//---------------------------------------------------------------------------
//
// How to print:
//
// 1. The client sends the data to be printed with one or several PRINT commands. The maximum
// transfer size per PRINT command is currently limited to 4096 bytes.
// 2. The client triggers printing with SYNCHRONIZE BUFFER. Each SYNCHRONIZE BUFFER results in
// the print command for this printer (see below) to be called for the data not yet printed.
//
// It is recommended to reserve the printer device before printing and to release it afterwards.
// The command to be used for printing can be set with the "cmd" property when attaching the device.
// By default the data to be printed are sent to the printer unmodified, using "lp -oraw %f". This
// requires that the client uses a printer driver compatible with the respective printer, or that the
// printing service on the Pi is configured to do any necessary conversions, or that the print command
// applies any conversions on the file to be printed (%f) before passing it to the printing service.
// 'enscript' is an example for a conversion tool.
// By attaching different devices/LUNs multiple printers (i.e. different print commands) are possible.
//
// With STOP PRINT printing can be cancelled before SYNCHRONIZE BUFFER was sent.
//
#include "shared/piscsi_exceptions.h"
#include "scsi_command_util.h"
#include "scsi_printer.h"
#include <filesystem>
using namespace std;
using namespace filesystem;
using namespace scsi_defs;
using namespace scsi_command_util;
SCSIPrinter::SCSIPrinter(int lun) : PrimaryDevice(SCLP, lun)
{
SupportsParams(true);
}
bool SCSIPrinter::Init(const param_map& params)
{
PrimaryDevice::Init(params);
AddCommand(scsi_command::eCmdTestUnitReady, [this] { TestUnitReady(); });
AddCommand(scsi_command::eCmdPrint, [this] { Print(); });
AddCommand(scsi_command::eCmdSynchronizeBuffer, [this] { SynchronizeBuffer(); });
// STOP PRINT is identical with TEST UNIT READY, it just returns the status
AddCommand(scsi_command::eCmdStopPrint, [this] { TestUnitReady(); });
// Required also in this class in order to fulfill the ScsiPrinterCommands interface contract
AddCommand(scsi_command::eCmdReserve6, [this] { ReserveUnit(); });
AddCommand(scsi_command::eCmdRelease6, [this] { ReleaseUnit(); });
AddCommand(scsi_command::eCmdSendDiagnostic, [this] { SendDiagnostic(); });
if (GetParam("cmd").find("%f") == string::npos) {
LogTrace("Missing filename specifier %f");
return false;
}
error_code error;
file_template = temp_directory_path(error); //NOSONAR Publicly writable directory is fine here
file_template += PRINTER_FILE_PATTERN;
SetReady(true);
return true;
}
void SCSIPrinter::CleanUp()
{
PrimaryDevice::CleanUp();
if (out.is_open()) {
out.close();
error_code error;
remove(path(filename), error);
filename = "";
}
}
param_map SCSIPrinter::GetDefaultParams() const
{
return {
{ "cmd", "lp -oraw %f" }
};
}
void SCSIPrinter::TestUnitReady()
{
// The printer is always ready
EnterStatusPhase();
}
vector<uint8_t> SCSIPrinter::InquiryInternal() const
{
return HandleInquiry(device_type::printer, scsi_level::scsi_2, false);
}
void SCSIPrinter::Print()
{
const uint32_t length = GetInt24(GetController()->GetCmd(), 2);
LogTrace("Expecting to receive " + to_string(length) + " byte(s) to be printed");
if (length > GetController()->GetBuffer().size()) {
LogError("Transfer buffer overflow: Buffer size is " + to_string(GetController()->GetBuffer().size()) +
" bytes, " + to_string(length) + " bytes expected");
++print_error_count;
throw scsi_exception(sense_key::illegal_request, asc::invalid_field_in_cdb);
}
GetController()->SetLength(length);
GetController()->SetByteTransfer(true);
EnterDataOutPhase();
}
void SCSIPrinter::SynchronizeBuffer()
{
if (!out.is_open()) {
LogWarn("Nothing to print");
++print_warning_count;
throw scsi_exception(sense_key::aborted_command);
}
string cmd = GetParam("cmd");
const size_t file_position = cmd.find("%f");
assert(file_position != string::npos);
cmd.replace(file_position, 2, filename);
error_code error;
LogTrace("Printing file '" + filename + "' with " + to_string(file_size(path(filename), error)) + " byte(s)");
LogDebug("Executing print command '" + cmd + "'");
if (system(cmd.c_str())) {
LogError("Printing file '" + filename + "' failed, the printing system might not be configured");
++print_error_count;
CleanUp();
throw scsi_exception(sense_key::aborted_command);
}
CleanUp();
EnterStatusPhase();
}
bool SCSIPrinter::WriteByteSequence(span<const uint8_t> buf)
{
byte_receive_count += buf.size();
if (!out.is_open()) {
vector<char> f(file_template.begin(), file_template.end());
f.push_back(0);
// There is no C++ API that generates a file with a unique name
const int fd = mkstemp(f.data());
if (fd == -1) {
LogError("Can't create printer output file for pattern '" + filename + "': " + strerror(errno));
++print_error_count;
return false;
}
close(fd);
filename = f.data();
out.open(filename, ios::binary);
if (out.fail()) {
++print_error_count;
throw scsi_exception(sense_key::aborted_command);
}
LogTrace("Created printer output file '" + filename + "'");
}
LogTrace("Appending " + to_string(buf.size()) + " byte(s) to printer output file ''" + filename + "'");
out.write((const char *)buf.data(), buf.size());
const bool status = out.fail();
if (status) {
++print_error_count;
}
return !status;
}
vector<PbStatistics> SCSIPrinter::GetStatistics() const
{
vector<PbStatistics> statistics = PrimaryDevice::GetStatistics();
PbStatistics s;
s.set_id(GetId());
s.set_unit(GetLun());
s.set_category(PbStatisticsCategory::CATEGORY_INFO);
s.set_key(FILE_PRINT_COUNT);
s.set_value(file_print_count);
statistics.push_back(s);
s.set_key(BYTE_RECEIVE_COUNT);
s.set_value(byte_receive_count);
statistics.push_back(s);
s.set_category(PbStatisticsCategory::CATEGORY_ERROR);
s.set_key(PRINT_ERROR_COUNT);
s.set_value(print_error_count);
statistics.push_back(s);
s.set_category(PbStatisticsCategory::CATEGORY_WARNING);
s.set_key(PRINT_WARNING_COUNT);
s.set_value(print_warning_count);
statistics.push_back(s);
return statistics;
}