313 lines
10 KiB
C++
313 lines
10 KiB
C++
#include <netinet/tcp.h>
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#include <log/LogUtils.h>
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#include <misc/memtracker.h>
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#include "crypt.h"
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#define DEFINE_HELPER
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#include "LicenseRequest.h"
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#include "License.h"
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#include <csignal>
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using namespace std;
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using namespace std::chrono;
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using namespace ts;
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using namespace license;
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#define DEBUG_LICENSE_CLIENT
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#define CERR(message) LICENSE_FERR(this, CouldNotConnectException, message)
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LicenceRequest::LicenceRequest(const std::shared_ptr<LicenseRequestData> & license, const sockaddr_in& remoteAddr) : data(license) {
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#ifdef DEBUG_LICENSE_CLIENT
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memtrack::allocated<LicenceRequest>(this);
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#endif
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memcpy(&this->remote_address, &remoteAddr, sizeof(remoteAddr));
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assert(license->info);
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}
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LicenceRequest::~LicenceRequest() {
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#ifdef DEBUG_LICENSE_CLIENT
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memtrack::freed<LicenceRequest>(this);
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#endif
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this->abortRequest();
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if(this->closeThread) {
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this->closeThread->join();
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delete this->closeThread;
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this->closeThread = nullptr;
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}
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delete this->currentFuture;
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this->currentFuture = nullptr;
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}
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threads::Future<std::shared_ptr<LicenseRequestResponse>> LicenceRequest::requestInfo() {
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{
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lock_guard lock(this->lock);
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if(this->currentFuture) return *this->currentFuture;
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this->currentFuture = new threads::Future<std::shared_ptr<LicenseRequestResponse>>();
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}
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this->beginRequest();
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return *this->currentFuture;
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}
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//Basic IO
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void LicenceRequest::handleEventWrite(int fd, short event, void* ptrClient) {
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auto* client = static_cast<LicenceRequest *>(ptrClient);
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buffer::RawBuffer* buffer = nullptr;
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{
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lock_guard lock(client->lock);
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if((event & EV_TIMEOUT) > 0) { //Connect timeout
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LICENSE_FERR(client, ConnectionException, "Connect timeout");
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return;
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}
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if(client->state == protocol::CONNECTING){
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client->handleConnected();
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}
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if(client->state == protocol::UNCONNECTED || !client->event_write)
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return;
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buffer = TAILQ_FIRST(&client->writeQueue);
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if(!buffer) return;
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auto writtenBytes = send(fd, &buffer->buffer[buffer->index], buffer->length - buffer->index, MSG_NOSIGNAL | MSG_DONTWAIT);
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buffer->index += writtenBytes;
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if(buffer->index >= buffer->length) {
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TAILQ_REMOVE(&client->writeQueue, buffer, tail);
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delete buffer;
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}
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if(!TAILQ_EMPTY(&client->writeQueue))
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event_add(client->event_write, nullptr);
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}
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}
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void LicenceRequest::sendPacket(const protocol::packet& packet) {
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if(this->state == protocol::UNCONNECTED || this->state == protocol::DISCONNECTING) {
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if(this->verbose)
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logError("Tried to send a packet to an unconnected remote!");
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return;
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}
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packet.prepare();
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auto buffer = new buffer::RawBuffer(packet.data.length() + sizeof(packet.header));
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memcpy(buffer->buffer, &packet.header, sizeof(packet.header));
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memcpy(&buffer->buffer[sizeof(packet.header)], packet.data.data(), packet.data.length());
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if(!this->cryptKey.empty())
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xorBuffer(&buffer->buffer[sizeof(packet.header)], packet.data.length(), this->cryptKey.data(), this->cryptKey.length());
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{
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lock_guard lock(this->lock);
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TAILQ_INSERT_TAIL(&this->writeQueue, buffer, tail);
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if(this->event_write)
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event_add(this->event_write, nullptr);
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}
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}
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void LicenceRequest::handleEventRead(int fd, short, void* ptrClient) {
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auto* client = static_cast<LicenceRequest *>(ptrClient);
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auto buffer = std::unique_ptr<void, decltype(free)*>{malloc(1024), free};
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sockaddr_in remoteAddr{};
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socklen_t remoteAddrSize = sizeof(remoteAddr);
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auto read = recvfrom(fd, buffer.get(), 1024, MSG_NOSIGNAL | MSG_DONTWAIT, reinterpret_cast<sockaddr *>(&remoteAddr), &remoteAddrSize);
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if(read < 0){
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if(errno == EWOULDBLOCK) return;
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if(client->event_read)
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event_del_noblock(client->event_read);
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LICENSE_FERR(client, ConnectionException, "Invalid read: " + string(strerror(errno)) + "/" + to_string(errno));
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return;
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} else if(read == 0) {
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if(client->event_read)
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event_del_noblock(client->event_read);
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LICENSE_FERR(client, ConnectionException, "IO error (" + to_string(errno) + "): " + string(strerror(errno)));
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return;
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}
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client->handleMessage(string((char*) buffer.get(), read));
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}
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static int enabled = 1;
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static int disabled = 0;
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void LicenceRequest::beginRequest() {
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lock_guard lock(this->lock);
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TAILQ_INIT(&this->writeQueue);
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this->file_descriptor = socket(AF_INET, SOCK_STREAM | SOCK_NONBLOCK, 0);
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if(this->file_descriptor < 0) CERR("Socket setup failed");
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signal(SIGPIPE, SIG_IGN);
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auto state = ::connect(this->file_descriptor, reinterpret_cast<const sockaddr *>(&this->remote_address), sizeof(this->remote_address));
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if(state < 0 && errno != EINPROGRESS) CERR("connect() failed (" + string(strerror(errno)) + ")");
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if(setsockopt(this->file_descriptor, SOL_SOCKET, SO_REUSEADDR, &enabled, sizeof(enabled)) < 0) CERR("could not set reuse addr");
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if(setsockopt(this->file_descriptor, IPPROTO_TCP, TCP_CORK, &disabled, sizeof(disabled)) < 0) CERR("could not set no push");
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if(fcntl(this->file_descriptor, F_SETFD, fcntl(this->file_descriptor, F_GETFL, 0) | FD_CLOEXEC | O_NONBLOCK) < 0) CERR("Failed to set FD_CLOEXEC and O_NONBLOCK");
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this->event_base = event_base_new();
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this->event_read = event_new(this->event_base, this->file_descriptor, EV_READ | EV_PERSIST, LicenceRequest::handleEventRead, this);
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this->event_write = event_new(this->event_base, this->file_descriptor, EV_WRITE, LicenceRequest::handleEventWrite, this);
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this->state = protocol::CONNECTING; //First set connected, then we could enable the event loop
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event_dispatch = std::thread([&]() {
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signal(SIGPIPE, SIG_IGN);
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{ /* now we could start listening */
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lock_guard _lock(this->lock);
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if(!this->event_read || !this->event_write) return;
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event_add(this->event_read, nullptr);
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timeval connect_timeout{5, 0};
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event_add(this->event_write, &connect_timeout);
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}
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event_base_dispatch(this->event_base);
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});
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}
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void LicenceRequest::handleConnected() {
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this->state = protocol::HANDSCAKE;
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uint8_t handshakeBuffer[4];
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handshakeBuffer[0] = 0xC0;
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handshakeBuffer[1] = 0xFF;
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handshakeBuffer[2] = 0xEE;
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handshakeBuffer[3] = LICENSE_PROT_VERSION;
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this->sendPacket(protocol::packet{protocol::PACKET_CLIENT_HANDSHAKE, string((const char*) handshakeBuffer, 4)}); //Initialise packet
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}
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void LicenceRequest::handleMessage(const std::string& message) {
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this->buffer += message;
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if(this->buffer.length() < sizeof(protocol::packet::header))
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return;
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protocol::packet packet{protocol::PACKET_DISCONNECT, ""};
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memcpy(&packet.header, this->buffer.data(), sizeof(protocol::packet::header));
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if(packet.header.length <= this->buffer.length() - sizeof(protocol::packet::header)) {
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packet.data = this->buffer.substr(sizeof(protocol::packet::header), packet.header.length);
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this->buffer = this->buffer.substr(sizeof(protocol::packet::header) + packet.header.length);
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} else {
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return;
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}
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if(!this->cryptKey.empty()) {
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xorBuffer((char*) packet.data.data(), packet.data.length(), this->cryptKey.data(), this->cryptKey.length());
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}
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if(packet.header.packetId == protocol::PACKET_SERVER_HANDSHAKE) {
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this->handlePacketHandshake(packet.data);
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} else if(packet.header.packetId == protocol::PACKET_DISCONNECT) {
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this->handlePacketDisconnect(packet.data);
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} else if(packet.header.packetId == protocol::PACKET_SERVER_VALIDATION_RESPONSE) {
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this->handlePacketLicenseInfo(packet.data);
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} else if(packet.header.packetId == protocol::PACKET_SERVER_PROPERTY_ADJUSTMENT) {
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this->handlePacketInfoAdjustment(packet.data);
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} else
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LICENSE_FERR(this, ConnectionException, "Invalid packet id (" + to_string(packet.header.packetId) + ")");
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if(!this->buffer.empty() && this->state != protocol::DISCONNECTING && this->state != protocol::UNCONNECTED)
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this->handleMessage("");
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}
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void LicenceRequest::disconnect(const std::string& message) {
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if(this->state != protocol::UNCONNECTED && this->state != protocol::DISCONNECTING)
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this->sendPacket({protocol::PACKET_DISCONNECT, message});
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this->closeConnection();
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//TODO flush?
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}
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void LicenceRequest::closeConnection() {
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event *event_read, *event_write;
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{
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lock_guard lock(this->lock);
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if(this->state == protocol::UNCONNECTED) return;
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if(this->event_dispatch.get_id() == this_thread::get_id()) { //We could not close in the same thread as we read/write (we're joining it later)
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if(this->state == protocol::DISCONNECTING) return;
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this->state = protocol::DISCONNECTING;
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this->closeThread = new threads::Thread(THREAD_SAVE_OPERATIONS, [&]() { this->closeConnection(); });
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#ifdef DEBUG_LICENSE_CLIENT
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if(this->verbose) {
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debugMessage("Running close in a new thread");
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this->closeThread->name("License request close");
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}
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#endif
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return;
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}
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this->state = protocol::UNCONNECTED;
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event_read = this->event_read;
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event_write = this->event_write;
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this->event_write = nullptr;
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this->event_read = nullptr;
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}
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if(event_read) {
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event_del_block(event_read);
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event_free(event_read);
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}
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if(event_write) {
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event_del_block(event_write);
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event_free(event_write);
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}
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/* close before base shutdown (else epoll hangup) */
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if(this->file_descriptor > 0) {
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shutdown(this->file_descriptor, SHUT_RDWR);
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close(this->file_descriptor);
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}
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this->file_descriptor = 0;
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{
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lock_guard lock(this->lock);
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ts::buffer::RawBuffer* buffer;
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while ((buffer = TAILQ_FIRST(&this->writeQueue))) {
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TAILQ_REMOVE(&this->writeQueue, buffer, tail);
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delete buffer;
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}
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}
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{
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if(this->event_base) {
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timeval seconds{1, 0};
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event_base_loopexit(this->event_base, &seconds);
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event_base_loopexit(this->event_base, nullptr);
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}
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if(this->event_dispatch.joinable()) {
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this->event_dispatch.join();
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}
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if(this->event_base) {
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event_base_free(this->event_base);
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this->event_base = nullptr;
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}
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}
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#ifdef DEBUG_LICENSE_CLIENT
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if(this->verbose)
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debugMessage("Executing close done");
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#endif
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}
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void LicenceRequest::abortRequest(const std::chrono::system_clock::time_point &timeout) {
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this->closeConnection();
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}
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