OpenFusion/src/core/CNProtocol.cpp

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#include "core/CNProtocol.hpp"
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#include "CNStructs.hpp"
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#include <assert.h>
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// ========================================================[[ CNSocketEncryption ]]========================================================
// literally C/P from the client and converted to C++ (does some byte swapping /shrug)
int CNSocketEncryption::Encrypt_byte_change_A(int ERSize, uint8_t* data, int size) {
int num = 0;
int num2 = 0;
int num3 = 0;
while (num + ERSize <= size) {
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int num4 = num + num3;
int num5 = num + (ERSize - 1 - num3);
uint8_t b = data[num4];
data[num4] = data[num5];
data[num5] = b;
num += ERSize;
num3++;
if (num3 > ERSize / 2) {
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num3 = 0;
}
}
num2 = ERSize - (num + ERSize - size);
return num + num2;
}
int CNSocketEncryption::xorData(uint8_t* buffer, uint8_t* key, int size) {
// xor every 8 bytes with 8 byte key
for (int i = 0; i < size; i++) {
buffer[i] ^= key[i % keyLength];
}
return size;
}
uint64_t CNSocketEncryption::createNewKey(uint64_t uTime, int32_t iv1, int32_t iv2) {
uint64_t num = (uint64_t)(iv1 + 1);
uint64_t num2 = (uint64_t)(iv2 + 1);
uint64_t dEKey = (uint64_t)(*(uint64_t*)&defaultKey[0]);
return dEKey * (uTime * num * num2);
}
int CNSocketEncryption::encryptData(uint8_t* buffer, uint8_t* key, int size) {
int eRSize = size % (keyLength / 2 + 1) * 2 + keyLength; // C/P from client
int size2 = xorData(buffer, key, size);
return Encrypt_byte_change_A(eRSize, buffer, size2);
}
int CNSocketEncryption::decryptData(uint8_t* buffer, uint8_t* key, int size) {
int eRSize = size % (keyLength / 2 + 1) * 2 + keyLength; // size % of 18????
int size2 = Encrypt_byte_change_A(eRSize, buffer, size);
return xorData(buffer, key, size2);
}
// ========================================================[[ CNPacketData ]]========================================================
CNPacketData::CNPacketData(void *b, uint32_t t, int l, int trnum, void *trs):
buf(b), size(l), type(t), trCnt(trnum), trailers(trs) {}
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// ========================================================[[ CNSocket ]]========================================================
CNSocket::CNSocket(SOCKET s, struct sockaddr_in &addr, PacketHandler ph): sock(s), sockaddr(addr), pHandler(ph) {
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EKey = (uint64_t)(*(uint64_t*)&CNSocketEncryption::defaultKey[0]);
}
bool CNSocket::sendData(uint8_t* data, int size) {
int sentBytes = 0;
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int maxTries = 10;
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while (sentBytes < size) {
int sent = send(sock, (buffer_t*)(data + sentBytes), size - sentBytes, 0);
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if (SOCKETERROR(sent)) {
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if (OF_ERRNO == OF_EWOULD && maxTries > 0) {
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maxTries--;
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continue; // try again
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}
printSocketError("send");
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return false; // error occured while sending bytes
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}
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sentBytes += sent;
}
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return true; // it worked!
}
void CNSocket::setEKey(uint64_t k) {
EKey = k;
}
void CNSocket::setFEKey(uint64_t k) {
FEKey = k;
}
uint64_t CNSocket::getEKey() {
return EKey;
}
uint64_t CNSocket::getFEKey() {
return FEKey;
}
bool CNSocket::isAlive() {
return alive;
}
void CNSocket::kill() {
if (!alive)
return;
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alive = false;
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#ifdef _WIN32
shutdown(sock, SD_BOTH);
closesocket(sock);
#else
shutdown(sock, SHUT_RDWR);
close(sock);
#endif
}
void CNSocket::validatingSendPacket(void *pkt, uint32_t packetType) {
assert(isOutboundPacketID(packetType));
assert(Packets::packets.find(packetType) != Packets::packets.end());
PacketDesc& desc = Packets::packets[packetType];
size_t resplen = desc.size;
/*
* Note that this validation doesn't happen on time to prevent a buffer
* overflow if it would have taken place, but we do it anyway so the
* assertion failure at least makes it clear that something isn't being
* validated properly.
*/
if (desc.variadic) {
int32_t ntrailers = *(int32_t*)(((uint8_t*)pkt) + desc.cntMembOfs);
assert(validOutVarPacket(desc.size, ntrailers, desc.trailerSize));
resplen = desc.size + ntrailers * desc.trailerSize;
}
sendPacket(pkt, packetType, resplen);
}
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void CNSocket::sendPacket(void* buf, uint32_t type, size_t size) {
if (!alive)
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return;
uint8_t fullpkt[CN_PACKET_BUFFER_SIZE]; // length, type, body
uint8_t* body = fullpkt + 4; // packet without length (type, body)
size_t bodysize = size + 4;
// set packet length
memcpy(fullpkt, (void*)&bodysize, 4);
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// copy packet type to the front of the buffer & then the actual buffer
memcpy(body, (void*)&type, 4);
memcpy(body+4, buf, size);
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// encrypt the packet
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switch (activeKey) {
case SOCKETKEY_E:
CNSocketEncryption::encryptData((uint8_t*)body, (uint8_t*)(&EKey), bodysize);
break;
case SOCKETKEY_FE:
CNSocketEncryption::encryptData((uint8_t*)body, (uint8_t*)(&FEKey), bodysize);
break;
default:
DEBUGLOG(
std::cout << "[WARN]: UNSET KEYTYPE FOR SOCKET!! ABORTING SEND" << std::endl;
)
return;
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}
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// send packet data!
if (alive && !sendData(fullpkt, bodysize+4))
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kill();
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}
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void CNSocket::setActiveKey(ACTIVEKEY key) {
activeKey = key;
}
inline void CNSocket::parsePacket(uint8_t *buf, size_t size) {
uint32_t type = *((uint32_t*)buf);
uint8_t *body = buf + 4;
size_t pktSize = size - 4;
if (Packets::packets.find(type) == Packets::packets.end()) {
std::cerr << "OpenFusion: UNKNOWN PACKET: " << (int)type << std::endl;
return;
}
if (!isInboundPacketID(type)) {
std::cerr << "OpenFusion: UNEXPECTED PACKET: " << (int)type << std::endl;
return;
}
PacketDesc& desc = Packets::packets[type];
/*
* Some packet structs with no meaningful contents have length 1, but
* the client doesn't transmit that byte at all, so we special-case that.
* It's important that we do that by zeroing that byte, as the server could
* hypothetically try and read from it and get a byte of the previous
* packet's contents.
*
* Assigning a zero byte to the body like this is safe, since there's a
* huge empty buffer behind that pointer.
*/
if (!desc.variadic && desc.size == 1 && pktSize == 0) {
pktSize = 1;
*body = 0;
}
int32_t ntrailers = 0;
if (desc.variadic) {
ntrailers = *(int32_t*)(body + desc.cntMembOfs);
if (!validInVarPacket(desc.size, ntrailers, desc.trailerSize, pktSize)) {
std::cerr << "[WARN] Received invalid variadic packet: " << desc.name << " (" << type << ")" << std::endl;
return;
}
} else if (!desc.variadic && pktSize != desc.size) {
std::cerr << "[WARN] Received " << desc.name << " (" << type << ") of wrong size ("
<< (int)pktSize << " vs " << desc.size << ")" << std::endl;
return;
}
void *trailers = nullptr;
if (desc.variadic)
trailers = body + desc.size;
CNPacketData pkt(body, type, pktSize, ntrailers, trailers);
pHandler(this, &pkt);
}
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void CNSocket::step() {
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// read step
// XXX NOTE: we must not recv() twice without a poll() inbetween
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if (readSize <= 0) {
// we aren't reading a packet yet, try to start looking for one
int recved = recv(sock, (buffer_t*)readBuffer, sizeof(int32_t), 0);
if (recved == 0) {
// the socket was closed normally
kill();
} else if (!SOCKETERROR(recved)) {
// we got our packet size!!!!
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readSize = *((int32_t*)readBuffer);
// sanity check
if (readSize > CN_PACKET_BUFFER_SIZE) {
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kill();
return;
}
// we'll just leave bufferIndex at 0 since we already have the packet size, it's safe to overwrite those bytes
activelyReading = true;
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} else if (OF_ERRNO != OF_EWOULD) {
// serious socket issue, disconnect connection
printSocketError("recv");
kill();
return;
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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)
int recved = recv(sock, (buffer_t*)(readBuffer + readBufferIndex), readSize - readBufferIndex, 0);
if (recved == 0) {
// the socket was closed normally
kill();
} else if (!SOCKETERROR(recved))
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readBufferIndex += recved;
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else if (OF_ERRNO != OF_EWOULD) {
// serious socket issue, disconnect connection
printSocketError("recv");
kill();
return;
}
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}
if (activelyReading && readBufferIndex >= readSize) {
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// decrypt readBuffer and copy to CNPacketData
CNSocketEncryption::decryptData((uint8_t*)&readBuffer, (uint8_t*)(&EKey), readSize);
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parsePacket(readBuffer, readSize);
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// reset vars :)
readSize = 0;
readBufferIndex = 0;
activelyReading = false;
}
}
void printSocketError(const char *call) {
#ifdef _WIN32
std::cerr << call << ": ";
LPSTR lpMsgBuf = nullptr; // string buffer
DWORD errCode = WSAGetLastError(); // error code
if (errCode == 0) {
std::cerr << "no error code" << std::endl;
return;
}
size_t bufSize = FormatMessageA( // actually get the error message
FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
errCode, // in
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPTSTR)&lpMsgBuf, // out
0, NULL);
// convert buffer to string and output message to terminal
std::string msg(lpMsgBuf, bufSize);
std::cerr << msg; // newline included
LocalFree(lpMsgBuf); // free the buffer
#else
perror(call);
#endif
}
bool setSockNonblocking(SOCKET listener, SOCKET newSock) {
#ifdef _WIN32
unsigned long mode = 1;
if (ioctlsocket(newSock, FIONBIO, &mode) != 0) {
#else
if (fcntl(newSock, F_SETFL, (fcntl(newSock, F_GETFL, 0) | O_NONBLOCK)) != 0) {
#endif
printSocketError("fcntl");
std::cerr << "[WARN] OpenFusion: fcntl failed on new connection" << std::endl;
#ifdef _WIN32
shutdown(newSock, SD_BOTH);
closesocket(newSock);
#else
shutdown(newSock, SHUT_RDWR);
close(newSock);
#endif
return false;
}
return true;
}
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// ========================================================[[ CNServer ]]========================================================
void CNServer::init() {
// create socket file descriptor
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sock = socket(AF_INET, SOCK_STREAM, 0);
if (SOCKETINVALID(sock)) {
printSocketError("socket");
std::cerr << "[FATAL] OpenFusion: socket failed" << std::endl;
exit(EXIT_FAILURE);
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}
// attach socket to the port
int opt = 1;
#ifdef _WIN32
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const char*)&opt, sizeof(opt)) != 0) {
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#else
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt)) != 0) {
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#endif
std::cerr << "[FATAL] OpenFusion: setsockopt failed" << std::endl;
printSocketError("setsockopt");
exit(EXIT_FAILURE);
}
address.sin_family = AF_INET;
address.sin_addr.s_addr = INADDR_ANY;
address.sin_port = htons(port);
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addressSize = sizeof(address);
// Bind to the port
if (SOCKETERROR(bind(sock, (struct sockaddr *)&address, addressSize))) {
std::cerr << "[FATAL] OpenFusion: bind failed" << std::endl;
printSocketError("bind");
exit(EXIT_FAILURE);
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}
if (SOCKETERROR(listen(sock, SOMAXCONN))) {
std::cerr << "[FATAL] OpenFusion: listen failed" << std::endl;
printSocketError("listen");
exit(EXIT_FAILURE);
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}
// set server listener to non-blocking
#ifdef _WIN32
unsigned long mode = 1;
if (ioctlsocket(sock, FIONBIO, &mode) != 0) {
#else
if (fcntl(sock, F_SETFL, (fcntl(sock, F_GETFL, 0) | O_NONBLOCK)) != 0) {
#endif
printSocketError("fcntl");
std::cerr << "[FATAL] OpenFusion: fcntl failed" << std::endl;
exit(EXIT_FAILURE);
}
// poll() configuration
fds.reserve(STARTFDSCOUNT);
fds.push_back({sock, POLLIN});
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}
CNServer::CNServer() {};
CNServer::CNServer(uint16_t p): port(p) {}
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void CNServer::addPollFD(SOCKET s) {
fds.push_back({s, POLLIN});
}
void CNServer::removePollFD(int i) {
auto it = fds.begin();
while (it != fds.end() && it->fd != fds[i].fd)
it++;
assert(it != fds.end());
fds.erase(it);
}
void CNServer::start() {
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std::cout << "Starting server at *:" << port << std::endl;
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while (active) {
// the timeout is to ensure shard timers are ticking
int n = poll(fds.data(), fds.size(), 50);
if (SOCKETERROR(n)) {
#ifndef _WIN32
if (errno == EINTR)
continue;
#endif
std::cout << "[FATAL] poll() returned error" << std::endl;
printSocketError("poll");
terminate(0);
}
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for (int i = 0; i < fds.size() && n > 0; i++) {
if (fds[i].revents == 0)
continue; // nothing in this one; don't decrement n
n--;
// is it the listener?
if (fds[i].fd == sock) {
// any sort of error on the listener
if (fds[i].revents & ~POLLIN) {
std::cout << "[FATAL] Error on listener socket" << std::endl;
terminate(0);
}
SOCKET newConnectionSocket = accept(sock, (struct sockaddr *)&address, (socklen_t*)&addressSize);
if (SOCKETINVALID(newConnectionSocket)) {
printSocketError("accept");
continue;
}
if (!setSockNonblocking(sock, newConnectionSocket))
continue;
std::cout << "New connection! " << inet_ntoa(address.sin_addr) << std::endl;
addPollFD(newConnectionSocket);
// add connection to list!
CNSocket* tmp = new CNSocket(newConnectionSocket, address, pHandler);
connections[newConnectionSocket] = tmp;
newConnection(tmp);
} else if (checkExtraSockets(i)) {
// no-op. handled in checkExtraSockets().
} else {
std::lock_guard<std::mutex> lock(activeCrit); // protect operations on connections
// halt packet handling if server is shutting down
if (!active)
return;
// player sockets
if (connections.find(fds[i].fd) == connections.end()) {
std::cout << "[FATAL] Event on non-existent socket: " << fds[i].fd << std::endl;
assert(0);
/* not reached */
}
CNSocket* cSock = connections[fds[i].fd];
// kill the socket on hangup/error
if (fds[i].revents & ~POLLIN)
cSock->kill();
if (cSock->isAlive()) {
cSock->step();
} else {
killConnection(cSock);
connections.erase(fds[i].fd);
delete cSock;
removePollFD(i);
// a new entry was moved to this position, so we check it again
i--;
}
}
}
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onStep();
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}
}
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void CNServer::kill() {
std::lock_guard<std::mutex> lock(activeCrit); // the lock will be removed when the function ends
active = false;
// kill all connections
for (auto& pair : connections) {
CNSocket *cSock = pair.second;
if (cSock->isAlive())
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cSock->kill();
delete cSock;
}
connections.clear();
}
void CNServer::printPacket(CNPacketData *data) {
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if (settings::VERBOSITY < 2)
return;
if (settings::VERBOSITY < 3) switch (data->type) {
case P_CL2LS_REP_LIVE_CHECK:
case P_CL2FE_REP_LIVE_CHECK:
case P_CL2FE_REQ_PC_MOVE:
case P_CL2FE_REQ_PC_JUMP:
case P_CL2FE_REQ_PC_SLOPE:
case P_CL2FE_REQ_PC_MOVEPLATFORM:
case P_CL2FE_REQ_PC_MOVETRANSPORTATION:
case P_CL2FE_REQ_PC_ZIPLINE:
case P_CL2FE_REQ_PC_JUMPPAD:
case P_CL2FE_REQ_PC_LAUNCHER:
case P_CL2FE_REQ_PC_STOP:
return;
}
std::cout << "OpenFusion: received " << Packets::p2str(data->type) << " (" << data->type << ")" << std::endl;
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}
bool CNServer::checkExtraSockets(int i) { return false; } // stubbed
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void CNServer::newConnection(CNSocket* cns) {} // stubbed
void CNServer::killConnection(CNSocket* cns) {} // stubbed
void CNServer::onStep() {} // stubbed