324 lines
9.9 KiB
C++
324 lines
9.9 KiB
C++
#include "CNProtocol.hpp"
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#include "CNStructs.hpp"
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// ========================================================[[ CNSocketEncryption ]]========================================================
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// literally C/P from the client and converted to C++ (does some byte swapping /shrug)
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int CNSocketEncryption::Encrypt_byte_change_A(int ERSize, uint8_t* data, int size) {
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int num = 0;
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int num2 = 0;
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int num3 = 0;
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while (num + ERSize <= size)
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{
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int num4 = num + num3;
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int num5 = num + (ERSize - 1 - num3);
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uint8_t b = data[num4];
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data[num4] = data[num5];
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data[num5] = b;
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num += ERSize;
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num3++;
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if (num3 > ERSize / 2)
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{
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num3 = 0;
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}
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}
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num2 = ERSize - (num + ERSize - size);
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return num + num2;
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}
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int CNSocketEncryption::xorData(uint8_t* buffer, uint8_t* key, int size) {
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// xor every 8 bytes with 8 byte key
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for (int i = 0; i < size; i++) {
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buffer[i] ^= key[i % keyLength];
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}
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return size;
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}
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uint64_t CNSocketEncryption::createNewKey(uint64_t uTime, int32_t iv1, int32_t iv2) {
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uint64_t num = (uint64_t)(iv1 + 1);
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uint64_t num2 = (uint64_t)(iv2 + 1);
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uint64_t dEKey = (uint64_t)(*(uint64_t*)&defaultKey[0]);
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return dEKey * (uTime * num * num2);
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}
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int CNSocketEncryption::encryptData(uint8_t* buffer, uint8_t* key, int size) {
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int eRSize = size % (keyLength / 2 + 1) * 2 + keyLength; // C/P from client
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int size2 = xorData(buffer, key, size);
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return Encrypt_byte_change_A(eRSize, buffer, size2);
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}
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int CNSocketEncryption::decryptData(uint8_t* buffer, uint8_t* key, int size) {
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int eRSize = size % (keyLength / 2 + 1) * 2 + keyLength; // size % of 18????
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int size2 = Encrypt_byte_change_A(eRSize, buffer, size);
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return xorData(buffer, key, size2);
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}
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// ========================================================[[ CNPacketData ]]========================================================
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CNPacketData::CNPacketData(void* b, uint32_t t, int l, uint64_t k): buf(b), type(t), size(l), key(k) {}
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CNPacketData::~CNPacketData() {
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free(buf); // we own the buffer
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}
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// ========================================================[[ CNSocket ]]========================================================
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CNSocket::CNSocket(SOCKET s, PacketHandler ph): sock(s), pHandler(ph) {
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EKey = (uint64_t)(*(uint64_t*)&CNSocketEncryption::defaultKey[0]);
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}
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bool CNSocket::sendData(uint8_t* data, int size) {
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int sentBytes = 0;
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while (sentBytes < size) {
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int sent = send(sock, (buffer_t*)(data + sentBytes), size - sentBytes, 0); // no flags defined
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if (SOCKETERROR(sent))
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return false; // error occured while sending bytes
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sentBytes += sent;
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}
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return true; // it worked!
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}
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void CNSocket::setEKey(uint64_t k) {
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EKey = k;
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}
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void CNSocket::setFEKey(uint64_t k) {
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FEKey = k;
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}
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uint64_t CNSocket::getEKey() {
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return EKey;
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}
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uint64_t CNSocket::getFEKey() {
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return FEKey;
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}
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bool CNSocket::isAlive() {
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return alive;
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}
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void CNSocket::kill() {
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alive = false;
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#ifdef _WIN32
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shutdown(sock, SD_BOTH);
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closesocket(sock);
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#else
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shutdown(sock, SHUT_RDWR);
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close(sock);
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#endif
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}
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void CNSocket::sendPacket(CNPacketData* pak) {
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int tmpSize = pak->size + sizeof(uint32_t);
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uint8_t* tmpBuf = (uint8_t*)xmalloc(tmpSize);
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// copy packet type to the front of the buffer & then the actual buffer
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memcpy(tmpBuf, (void*)&pak->type, sizeof(uint32_t));
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memcpy(tmpBuf+sizeof(uint32_t), pak->buf, pak->size);
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// encrypt the packet
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CNSocketEncryption::encryptData((uint8_t*)tmpBuf, (uint8_t*)(&pak->key), tmpSize);
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// send packet size
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sendData((uint8_t*)&tmpSize, sizeof(uint32_t));
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// send packet data!
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sendData(tmpBuf, tmpSize);
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delete pak;
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free(tmpBuf); // free tmp buffer
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}
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void CNSocket::step() {
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if (readSize <= 0) {
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// we aren't reading a packet yet, try to start looking for one
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int recved = recv(sock, (buffer_t*)readBuffer, sizeof(int32_t), 0);
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if (!SOCKETERROR(recved)) {
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// we got out packet size!!!!
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readSize = *((int32_t*)readBuffer);
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// sanity check
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if (readSize > MAX_PACKETSIZE) {
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kill();
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return;
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}
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// we'll just leave bufferIndex at 0 since we already have the packet size, it's safe to overwrite those bytes
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activelyReading = true;
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}
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}
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if (readSize > 0 && readBufferIndex < readSize) {
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// read until the end of the packet! (or at least try too)
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int recved = recv(sock, (buffer_t*)(readBuffer + readBufferIndex), readSize - readBufferIndex, 0);
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if (!SOCKETERROR(recved))
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readBufferIndex += recved;
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}
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if (activelyReading && readBufferIndex - readSize <= 0) {
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// decrypt readBuffer and copy to CNPacketData
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CNSocketEncryption::decryptData(readBuffer, (uint8_t*)(&EKey), readSize);
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// this doesn't leak memory because we free it in CNPacketData's deconstructor LOL
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void* tmpBuf = xmalloc(readSize-sizeof(int32_t));
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memcpy(tmpBuf, readBuffer+sizeof(uint32_t), readSize-sizeof(int32_t));
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CNPacketData tmp(tmpBuf, *((uint32_t*)readBuffer), readSize-sizeof(int32_t), EKey);
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// CALL PACKET HANDLER!!
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pHandler(this, &tmp); // tmp's deconstructor will be called when readStep returns so that tmpBuffer we made will be cleaned up :)
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// reset vars :)
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readSize = 0;
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readBufferIndex = 0;
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activelyReading = false;
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}
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}
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// ========================================================[[ CNServer ]]========================================================
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void CNServer::init() {
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// create socket file descriptor
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sock = socket(AF_INET, SOCK_STREAM, 0);
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if (SOCKETINVALID(sock)) {
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std::cerr << "[FATAL] OpenFusion: socket failed" << std::endl;
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exit(EXIT_FAILURE);
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}
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// attach socket to the port
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int opt = 1;
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#ifdef _WIN32
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&opt, sizeof(opt)) != 0) {
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#else
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) != 0) {
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#endif
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std::cerr << "[FATAL] OpenFusion: setsockopt failed" << std::endl;
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exit(EXIT_FAILURE);
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}
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address.sin_family = AF_INET;
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address.sin_addr.s_addr = INADDR_ANY;
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address.sin_port = htons(port);
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addressSize = sizeof(address);
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// Bind to the port
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if (SOCKETERROR(bind(sock, (struct sockaddr *)&address, addressSize))) {
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std::cerr << "[FATAL] OpenFusion: bind failed" << std::endl;
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exit(EXIT_FAILURE);
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}
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if (SOCKETERROR(listen(sock, SOMAXCONN))) {
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std::cerr << "[FATAL] OpenFusion: listen failed" << std::endl;
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exit(EXIT_FAILURE);
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}
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// set server listener to non-blocking
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#ifdef _WIN32
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unsigned long mode = 1;
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if (ioctlsocket(sock, FIONBIO, &mode) != 0) {
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#else
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if (fcntl(sock, F_SETFL, (fcntl(sock, F_GETFL, 0) | O_NONBLOCK)) != 0) {
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#endif
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std::cerr << "[FATAL] OpenFusion: fcntl failed" << std::endl;
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exit(EXIT_FAILURE);
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}
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}
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CNServer::CNServer() {
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lastTimer = getTime();
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};
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CNServer::CNServer(uint16_t p): port(p) {
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lastTimer = getTime();
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}
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void CNServer::start() {
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std::cout << "Starting server at *:" << port << std::endl;
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// listen to new connections, add to connection list
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while (active) {
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std::lock_guard<std::mutex> lock(activeCrit);
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// listen for a new connection
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SOCKET newConnection = accept(sock, (struct sockaddr *)&(address), (socklen_t*)&(addressSize));
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if (!SOCKETINVALID(newConnection)) {
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// new connection! make sure to set non-blocking!
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#ifdef _WIN32
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unsigned long mode = 1;
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if (ioctlsocket(newConnection, FIONBIO, &mode) != 0) {
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#else
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if (fcntl(newConnection, F_SETFL, (fcntl(sock, F_GETFL, 0) | O_NONBLOCK)) != 0) {
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#endif
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std::cerr << "[WARN] OpenFusion: fcntl failed on new connection" << std::endl;
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#ifdef _WIN32
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shutdown(newConnection, SD_BOTH);
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closesocket(newConnection);
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#else
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shutdown(newConnection, SHUT_RDWR);
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close(newConnection);
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#endif
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continue;
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}
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std::cout << "New connection! " << inet_ntoa(address.sin_addr) << std::endl;
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// add connection to list!
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CNSocket* tmp = new CNSocket(newConnection, pHandler);
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connections.push_back(tmp);
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}
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// for each connection, check if it's alive, if not kill it!
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std::list<CNSocket*>::iterator i = connections.begin();
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while (i != connections.end()) {
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CNSocket* cSock = *i;
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if (cSock->isAlive()) {
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cSock->step();
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++i; // go to the next element
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} else {
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killConnection(cSock);
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connections.erase(i++);
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delete cSock;
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}
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}
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if (getTime() - lastTimer > 2000) { // every 2 seconds call the onTimer method
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onTimer();
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lastTimer = getTime();
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}
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#ifdef _WIN32
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Sleep(0);
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#else
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sleep(0); // so your cpu isn't at 100% all the time, we don't need all of that! im not hacky! you're hacky!
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#endif
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}
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}
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void CNServer::kill() {
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std::lock_guard<std::mutex> lock(activeCrit); // the lock will be removed when the function ends
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active = false;
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// kill all connections
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std::list<CNSocket*>::iterator i = connections.begin();
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while (i != connections.end()) {
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CNSocket* cSock = *i;
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if (cSock->isAlive()) {
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cSock->kill();
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}
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++i; // go to the next element
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delete cSock;
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}
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connections.clear();
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}
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void CNServer::killConnection(CNSocket* cns) {} // stubbed lol
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void CNServer::onTimer() {} // stubbed lol
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