380 lines
14 KiB
C++
380 lines
14 KiB
C++
#include <unistd.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <algorithm>
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#include <arpa/inet.h>
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#include <log/LogUtils.h>
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#include <misc/endianness.h>
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#include <LicenseRequest.pb.h>
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#include <shared/License.h>
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#include <shared/crypt.h>
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#include <misc/base64.h>
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#include "LicenseServer.h"
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#include "crypt.h"
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#include "UserManager.h"
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using namespace std;
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using namespace std::chrono;
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using namespace license;
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using namespace ts;
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LicenseServer::LicenseServer(const sockaddr_in& addr,
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const std::shared_ptr<server::LicenseManager>& manager,
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const shared_ptr<license::stats::StatisticManager> &stats,
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const shared_ptr<license::web::WebStatistics> &wstats,
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const std::shared_ptr<UserManager>& user_manager) : manager(manager), statistics(stats), web_statistics(wstats), user_manager(user_manager) {
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this->localAddr = new sockaddr_in{};
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memcpy(this->localAddr, &addr, sizeof(addr));
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}
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LicenseServer::~LicenseServer() {
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this->stopServer();
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delete this->localAddr;
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}
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#define SFAIL(message) \
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do { \
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logError(lstream << (message) << " Message: " << errno << "/" << strerror(errno)); \
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this->stopServer(); \
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return false; \
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} while(0)
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static int enabled = 1;
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static int disabled = 0;
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bool LicenseServer::startServer() {
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{
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lock_guard lock(this->lock);
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if(this->running) return false;
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this->running = true;
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}
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fileDescriptor = socket(AF_INET, SOCK_STREAM, 0);
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if (fileDescriptor < 0) SFAIL("Could not create new socket");
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if(setsockopt(this->fileDescriptor, SOL_SOCKET, SO_REUSEADDR, &enabled, sizeof(enabled)) < 0) SFAIL("could not set reuse address");
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if(setsockopt(this->fileDescriptor, IPPROTO_TCP, TCP_CORK, &disabled, sizeof(disabled)) < 0) SFAIL("could not set no push");
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if(bind(this->fileDescriptor, (struct sockaddr *) this->localAddr, sizeof(sockaddr_in)) < 0) SFAIL("Could not bind socket on " + string(inet_ntoa(this->localAddr->sin_addr)));
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if(listen(this->fileDescriptor, 32) < 0) SFAIL("Could not listen on socket");
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this->evBase = event_base_new();
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this->acceptEvent = event_new(this->evBase, this->fileDescriptor, EV_READ | EV_PERSIST, LicenseServer::handleEventAccept, this);
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this->client_cleanup = evtimer_new(this->evBase, LicenseServer::handleEventCleanup, this);
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event_add(this->acceptEvent, nullptr);
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{
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timeval now{1, 0};
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evtimer_add(this->client_cleanup, &now);
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}
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evBaseDispatch = new threads::Thread(THREAD_SAVE_OPERATIONS, [&](){
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signal(SIGPIPE, SIG_IGN);
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event_base_dispatch(this->evBase);
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});
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return true;
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}
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void LicenseServer::stopServer() {
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{
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lock_guard lock(this->lock);
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if(!this->running) return;
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this->running = false;
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}
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for(const auto& client : this->getClients())
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this->closeConnection(client);
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if(this->acceptEvent) {
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event_del(this->acceptEvent);
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event_free(this->acceptEvent);
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}
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this->acceptEvent = nullptr;
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if(this->client_cleanup) {
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event_del_block(this->client_cleanup);
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event_free(this->client_cleanup);
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this->client_cleanup = nullptr;
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}
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if(this->evBase)
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event_base_loopbreak(this->evBase);
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if(this->evBaseDispatch)
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this->evBaseDispatch->join();
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delete this->evBaseDispatch;
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this->evBaseDispatch = nullptr;
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if(this->evBase) {
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event_base_loopbreak(this->evBase); /* again for some reason */
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event_base_free(this->evBase);
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}
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this->evBase = nullptr;
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if(this->fileDescriptor != 0) {
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shutdown(this->fileDescriptor, SHUT_RDWR);
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close(this->fileDescriptor);
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this->fileDescriptor = 0;
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}
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}
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void LicenseServer::handleEventCleanup(int, short, void* ptrServer) {
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auto server = static_cast<LicenseServer *>(ptrServer);
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server->cleanup_clients();
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timeval next{1, 0};
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if(server->client_cleanup)
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event_add(server->client_cleanup, &next);
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}
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//Basic IO
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void LicenseServer::handleEventWrite(int fd, short, void* ptrServer) {
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auto server = static_cast<LicenseServer *>(ptrServer);
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auto client = server->findClient(fd);
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if(!client) return;
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buffer::RawBuffer* buffer = nullptr;
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{
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threads::MutexLock lock(client->network.lock);
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buffer = TAILQ_FIRST(&client->network.writeQueue);
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if(!buffer) return;
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auto writtenBytes = send(fd, &buffer->buffer[buffer->index], buffer->length - buffer->index, 0);
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if(writtenBytes <= 0) {
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if(writtenBytes == -1 && errno == EAGAIN)
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return;
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logError(LOG_LICENSE_CONTROLL, "Invalid write. Disconnecting remote client. Message: {}/{}", errno, strerror(errno));
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} else {
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buffer->index += writtenBytes;
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}
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if(buffer->index >= buffer->length) {
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TAILQ_REMOVE(&client->network.writeQueue, buffer, tail);
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delete buffer;
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}
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if(!TAILQ_EMPTY(&client->network.writeQueue))
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event_add(client->network.writeEvent, nullptr);
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}
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}
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void ConnectedClient::sendPacket(const protocol::packet& packet) {
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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->protocol.cryptKey.empty())
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xorBuffer(&buffer->buffer[sizeof(packet.header)], packet.data.length(), this->protocol.cryptKey.data(), this->protocol.cryptKey.length());
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{
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threads::MutexLock lock(this->network.lock);
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TAILQ_INSERT_TAIL(&this->network.writeQueue, buffer, tail);
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}
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event_add(this->network.writeEvent, nullptr);
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}
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void ConnectedClient::init() {
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protocol.last_read = std::chrono::system_clock::now();
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TAILQ_INIT(&network.writeQueue);
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}
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void ConnectedClient::uninit() {
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{
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threads::MutexLock lock(this->network.lock);
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ts::buffer::RawBuffer* buffer;
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while ((buffer = TAILQ_FIRST(&this->network.writeQueue))) {
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TAILQ_REMOVE(&this->network.writeQueue, buffer, tail);
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delete buffer;
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}
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}
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if(network.fileDescriptor > 0) {
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shutdown(this->network.fileDescriptor, SHUT_RDWR);
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close(this->network.fileDescriptor);
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network.fileDescriptor = 0;
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}
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if(this->network.readEvent) event_del(this->network.readEvent);
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this->network.readEvent = nullptr;
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if(this->network.writeEvent) event_del(this->network.writeEvent);
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this->network.writeEvent = nullptr;
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}
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void LicenseServer::handleEventRead(int fd, short, void* ptrServer) {
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auto server = static_cast<LicenseServer *>(ptrServer);
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auto client = server->findClient(fd);
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if(!client) return;
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char buffer[1024];
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sockaddr_in remoteAddress{};
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socklen_t remoteAddressSize = sizeof(remoteAddress);
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auto read = recvfrom(fd, buffer, 1024, 0, reinterpret_cast<sockaddr *>(&remoteAddress), &remoteAddressSize);
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if(read < 0){
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if(errno == EWOULDBLOCK) return;
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logError(LOG_LICENSE_CONTROLL, "Invalid read. Disconnecting remote client. Message: {}/{}", errno, strerror(errno));
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event_del_noblock(client->network.readEvent);
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server->closeConnection(client);
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return;
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} else if(read == 0) {
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logError(LOG_LICENSE_CONTROLL, "Invalid read. Disconnecting remote client");
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event_del_noblock(client->network.readEvent);
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server->closeConnection(client);
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return;
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}
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client->protocol.last_read = std::chrono::system_clock::now();
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server->handleMessage(client, string(buffer, read));
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}
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void LicenseServer::handleEventAccept(int fd, short, void* ptrServer) {
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auto server = static_cast<LicenseServer *>(ptrServer);
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auto client = make_shared<ConnectedClient>();
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client->init();
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socklen_t client_len = sizeof(client->network.remoteAddr);
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client->network.fileDescriptor = accept(fd, (struct sockaddr *)&client->network.remoteAddr, &client_len);
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if(setsockopt(client->network.fileDescriptor, SOL_SOCKET, SO_REUSEADDR, &enabled, sizeof(enabled)) < 0);// CERR("could not set reuse addr");
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if(setsockopt(client->network.fileDescriptor, IPPROTO_TCP, TCP_CORK, &disabled, sizeof(disabled)) < 0);// CERR("could not set no push");
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if (client->network.fileDescriptor < 0) {
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logCritical("Could not accept new client! (" + to_string(client->network.fileDescriptor) + "|" + to_string(errno) + "|" + strerror(errno) + ")");
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return;
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}
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client->protocol.state = protocol::HANDSCAKE;
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{
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lock_guard lock(server->lock);
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server->currentClients.push_back(client);
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}
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client->network.readEvent = event_new(server->evBase, client->network.fileDescriptor, EV_READ | EV_PERSIST, LicenseServer::handleEventRead, server);
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client->network.writeEvent = event_new(server->evBase, client->network.fileDescriptor, EV_WRITE, LicenseServer::handleEventWrite, server);
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event_add(client->network.readEvent, nullptr);
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logMessage(lstream << "Got new client from " << inet_ntoa(client->network.remoteAddr.sin_addr));
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}
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void LicenseServer::disconnectClient(const std::shared_ptr<ConnectedClient>& client, const std::string &reason) {
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client->sendPacket({protocol::PACKET_DISCONNECT, reason});
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}
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void LicenseServer::closeConnection(const std::shared_ptr<ConnectedClient> &client, bool blocking) {
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if(this->evBaseDispatch && threads::self::id() == *this->evBaseDispatch) {
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std::thread(std::bind(&LicenseServer::closeConnection, this, client, true)).detach();
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return;
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}
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{
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unique_lock lock(client->network.lock);
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if(!TAILQ_EMPTY(&client->network.writeQueue)) {
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lock.unlock();
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if(!blocking) {
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std::thread(std::bind(&LicenseServer::closeConnection, this, client, true)).detach();
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return;
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}
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auto start = system_clock::now();
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while(system_clock::now() - start < seconds(5)){
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{
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lock.lock();
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if(TAILQ_EMPTY(&client->network.writeQueue)) break;
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lock.unlock();
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}
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threads::self::sleep_for(milliseconds(5));
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}
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}
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}
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this->unregisterClient(client);
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}
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void LicenseServer::unregisterClient(const std::shared_ptr<ConnectedClient> &client) {
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{
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lock_guard lock(this->lock);
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auto it = find(this->currentClients.begin(), this->currentClients.end(), client);
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if(it != this->currentClients.end())
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this->currentClients.erase(it);
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}
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client->protocol.state = protocol::UNCONNECTED;
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client->uninit();
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}
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void LicenseServer::cleanup_clients() {
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unique_lock lock(this->lock);
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auto clients = this->currentClients;
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lock.unlock();
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for(const auto& client : clients) {
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if(client->protocol.last_read + minutes(1) < system_clock::now()) {
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if(client->protocol.state != protocol::DISCONNECTING && client->protocol.state != protocol::UNCONNECTED) {
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this->disconnectClient(client, "timeout");
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this->closeConnection(client);
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client->protocol.state = protocol::DISCONNECTING;
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} else {
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auto it = find(this->currentClients.begin(), this->currentClients.end(), client);
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if(it != this->currentClients.end())
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this->currentClients.erase(it);
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}
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}
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}
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debugMessage("Client's cleaned up");
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}
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std::shared_ptr<ConnectedClient> LicenseServer::findClient(int fileDescriptor) {
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lock_guard lock(this->lock);
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for(const auto& cl : this->currentClients)
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if(cl->network.fileDescriptor == fileDescriptor)
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return cl;
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return nullptr;
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}
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#define ERR(message) \
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do { \
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logError(lstream << message); \
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this->closeConnection(client); \
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return; \
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} while(0)
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void LicenseServer::handleMessage(shared_ptr<ConnectedClient>& client, const std::string& message) {
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if(message.length() < sizeof(protocol::packet::header)) ERR("A client tried to send a invalid packet (too small header)");
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protocol::packet packet{protocol::PACKET_DISCONNECT, ""};
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memcpy(&packet.header, message.data(), sizeof(protocol::packet::header));
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packet.data = message.substr(sizeof(protocol::packet::header), packet.header.length);
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if(!client->protocol.cryptKey.empty())
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xorBuffer((char*) packet.data.data(), packet.data.length(), client->protocol.cryptKey.data(), client->protocol.cryptKey.length());
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bool success = false;
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string error;
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try {
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if(packet.header.packetId == protocol::PACKET_CLIENT_HANDSHAKE) {
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success = this->handleHandshake(client, packet, error);
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} else if(packet.header.packetId == protocol::PACKET_DISCONNECT) {
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success = this->handleDisconnect(client, packet, error);
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} else if(packet.header.packetId == protocol::PACKET_CLIENT_SERVER_VALIDATION) {
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success = this->handleServerValidation(client, packet, error);
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} else if(packet.header.packetId == protocol::PACKET_CLIENT_PROPERTY_ADJUSTMENT) {
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success = this->handlePacketPropertyUpdate(client, packet, error);
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} else if(packet.header.packetId == protocol::PACKET_CLIENT_AUTH_REQUEST) {
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success = this->handlePacketAuth(client, packet, error);
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} else if(packet.header.packetId == protocol::PACKET_CLIENT_LICENSE_CREATE_REQUEST) {
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success = this->handlePacketLicenseCreate(client, packet, error);
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} else if(packet.header.packetId == protocol::PACKET_CLIENT_LIST_REQUEST) {
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success = this->handlePacketLicenseList(client, packet, error);
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} else if(packet.header.packetId == protocol::PACKET_CLIENT_DELETE_REQUEST) {
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success = this->handlePacketLicenseDelete(client, packet, error);
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} else if(packet.header.packetId == protocol::PACKET_PING) {
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/* nothing todo */
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} else error = "Invalid packet id!";
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} catch (std::exception& ex) {
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success = false;
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error = "Caught exception while handle packet: " + string(ex.what());
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}
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if(!success) {
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logError("[CLIENT][" + client->address() + "] Failed to handle packet. message: " + error);
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this->disconnectClient(client, error);
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}
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} |