mirror of https://github.com/akuker/RASCSI.git
117 lines
2.7 KiB
C++
117 lines
2.7 KiB
C++
//---------------------------------------------------------------------------
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//
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// SCSI Target Emulator PiSCSI
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// for Raspberry Pi
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//
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// Copyright (C) 2022-2023 Uwe Seimet
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//
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//---------------------------------------------------------------------------
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#include "shared/piscsi_util.h"
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#include "shared/piscsi_exceptions.h"
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#include "command_context.h"
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#include "piscsi_service.h"
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#include <spdlog/spdlog.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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#include <csignal>
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#include <cassert>
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using namespace piscsi_util;
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string PiscsiService::Init(const callback& cb, int port)
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{
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assert(service_socket == -1);
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if (port <= 0 || port > 65535) {
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return "Invalid port number " + to_string(port);
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}
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service_socket = socket(PF_INET, SOCK_STREAM, 0);
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if (service_socket == -1) {
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return "Unable to create service socket: " + string(strerror(errno));
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}
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if (const int yes = 1; setsockopt(service_socket, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0) {
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Stop();
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return "Can't reuse address";
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}
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sockaddr_in server = {};
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server.sin_family = PF_INET;
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server.sin_port = htons((uint16_t)port);
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server.sin_addr.s_addr = INADDR_ANY;
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if (bind(service_socket, reinterpret_cast<const sockaddr *>(&server), sizeof(sockaddr_in)) < 0) { //NOSONAR bit_cast is not supported by the bullseye compiler
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Stop();
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return "Port " + to_string(port) + " is in use, is piscsi already running?";
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}
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if (listen(service_socket, 2) == -1) {
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Stop();
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return "Can't listen to service socket: " + string(strerror(errno));
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}
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execute = cb;
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return "";
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}
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void PiscsiService::Start()
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{
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assert(service_socket != -1);
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service_thread = jthread([this] () { Execute(); } );
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}
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void PiscsiService::Stop()
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{
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assert(service_socket != -1);
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shutdown(service_socket, SHUT_RD);
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close(service_socket);
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service_socket = -1;
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}
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void PiscsiService::Execute() const
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{
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#ifdef __linux__
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// Run this thread with very low priority
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sched_param schedparam = { .sched_priority = 0 };
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sched_setscheduler(0, SCHED_IDLE, &schedparam);
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#endif
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// TODO Accept more than one command instead of closing the socket after a single command
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while (service_socket != -1) {
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const int fd = accept(service_socket, nullptr, nullptr);
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if (fd != -1) {
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ExecuteCommand(fd);
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close(fd);
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}
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}
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}
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void PiscsiService::ExecuteCommand(int fd) const
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{
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CommandContext context(fd);
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try {
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if (context.ReadCommand()) {
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execute(context);
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}
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}
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catch(const io_exception& e) {
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spdlog::warn(e.what());
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// Try to return an error message (this may fail if the exception was caused when returning the actual result)
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PbResult result;
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result.set_msg(e.what());
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try {
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context.WriteResult(result);
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}
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catch(const io_exception&) { //NOSONAR Not handled on purpose
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// Ignore
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}
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}
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}
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