dcrubro/columnlynx
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

First working alpha, version a0.4 #7

Merged
dcrubro merged 22 commits from beta into master 2025-11-18 20:09:11 +00:00
Conversation 0 Commits 22 Files Changed 24 +310 -52
15 changed files with 310 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files
Showing only changes of commit 5c8409b312 - Show all commits

7
include/columnlynx/client/net/tcp/tcp_client.hpp
View File

@@ -13,6 +13,8 @@
#include <array>
#include <algorithm>
#include <vector>
#include <columnlynx/common/net/protocol_structs.hpp>
#include <columnlynx/common/net/virtual_interface.hpp>
using asio::ip::tcp;
@@ -25,7 +27,8 @@ namespace ColumnLynx::Net::TCP {
Utils::LibSodiumWrapper* sodiumWrapper,
std::array<uint8_t, 32>* aesKey,
uint64_t* sessionIDRef,
bool* insecureMode)
bool* insecureMode,
VirtualInterface* tun = nullptr)
:
mResolver(ioContext),
mSocket(ioContext),
@@ -70,5 +73,7 @@ namespace ColumnLynx::Net::TCP {
std::chrono::steady_clock::time_point mLastHeartbeatSent;
int mMissedHeartbeats = 0;
bool mIsHostDomain;
Protocol::TunConfig mTunConfig;
VirtualInterface* mTun = nullptr;
};
}

7
include/columnlynx/client/net/udp/udp_client.hpp
View File

@@ -9,6 +9,7 @@
#include <columnlynx/common/utils.hpp>
#include <columnlynx/common/libsodium_wrapper.hpp>
#include <array>
#include <columnlynx/common/net/virtual_interface.hpp>
namespace ColumnLynx::Net::UDP {
class UDPClient {
@@ -17,8 +18,9 @@ namespace ColumnLynx::Net::UDP {
const std::string& host,
const std::string& port,
std::array<uint8_t, 32>* aesKeyRef,
uint64_t* sessionIDRef)
: mSocket(ioContext), mResolver(ioContext), mHost(host), mPort(port), mAesKeyRef(aesKeyRef), mSessionIDRef(sessionIDRef) { mStartReceive(); }
uint64_t* sessionIDRef,
VirtualInterface* tunRef = nullptr)
: mSocket(ioContext), mResolver(ioContext), mHost(host), mPort(port), mAesKeyRef(aesKeyRef), mSessionIDRef(sessionIDRef), mTunRef(tunRef) { mStartReceive(); }
void start();
void sendMessage(const std::string& data = "");
@@ -35,6 +37,7 @@ namespace ColumnLynx::Net::UDP {
std::string mPort;
std::array<uint8_t, 32>* mAesKeyRef;
uint64_t* mSessionIDRef;
VirtualInterface* mTunRef;
std::array<uint8_t, 2048> mRecvBuffer; // Adjust size as needed
};
}

21
include/columnlynx/common/net/protocol_structs.hpp Normal file
View File

@@ -0,0 +1,21 @@
// protocol_structs.hpp - Network Protocol Structures
// Copyright (C) 2025 DcruBro
// Distributed under the terms of the GNU General Public License, either version 2 only or version 3. See LICENSES/ for details.
#pragma once
#include <cstdint>
namespace ColumnLynx::Protocol {
#pragma pack(push, 1)
struct TunConfig {
uint8_t version;
uint8_t prefixLength;
uint16_t mtu;
uint32_t serverIP;
uint32_t clientIP;
uint32_t dns1;
uint32_t dns2;
};
#pragma pack(pop)
}

52
include/columnlynx/common/net/session_registry.hpp
View File

@@ -21,6 +21,9 @@ namespace ColumnLynx::Net {
std::atomic<uint64_t> sendCounter{0};
std::chrono::steady_clock::time_point created = std::chrono::steady_clock::now();
std::chrono::steady_clock::time_point expires{};
uint32_t clientTunIP;
uint32_t serverTunIP;
uint64_t sessionID;
Nonce base_nonce{};
~SessionState() { sodium_memzero(aesKey.data(), aesKey.size()); }
@@ -29,7 +32,7 @@ namespace ColumnLynx::Net {
SessionState(SessionState&&) = default;
SessionState& operator=(SessionState&&) = default;
explicit SessionState(const SymmetricKey& k, std::chrono::seconds ttl = std::chrono::hours(24)) : aesKey(k) {
explicit SessionState(const SymmetricKey& k, std::chrono::seconds ttl = std::chrono::hours(24), uint32_t clientIP = 0, uint32_t serverIP = 0, uint64_t id = 0) : aesKey(k), clientTunIP(clientIP), serverTunIP(serverIP), sessionID(id) {
expires = created + ttl;
}
@@ -46,6 +49,7 @@ namespace ColumnLynx::Net {
void put(uint64_t sessionID, std::shared_ptr<SessionState> state) {
std::unique_lock lock(mMutex);
mSessions[sessionID] = std::move(state);
mIPSessions[mSessions[sessionID]->clientTunIP] = mSessions[sessionID];
}
// Lookup
@@ -55,6 +59,12 @@ namespace ColumnLynx::Net {
return (it == mSessions.end()) ? nullptr : it->second;
}
std::shared_ptr<const SessionState> getByIP(uint32_t ip) const {
std::shared_lock lock(mMutex);
auto it = mIPSessions.find(ip);
return (it == mIPSessions.end()) ? nullptr : it->second;
}
std::unordered_map<uint64_t, std::shared_ptr<SessionState>> snapshot() const {
std::unordered_map<uint64_t, std::shared_ptr<SessionState>> snap;
std::shared_lock lock(mMutex);
@@ -79,10 +89,50 @@ namespace ColumnLynx::Net {
++it;
}
}
for (auto it = mIPSessions.begin(); it != mIPSessions.end(); ) {
if (it->second && it->second->expires <= now) {
it = mIPSessions.erase(it);
} else {
++it;
}
}
}
int size() const {
std::shared_lock lock(mMutex);
return static_cast<int>(mSessions.size());
}
// IP management (simple for /24 subnet)
uint32_t getFirstAvailableIP() const {
std::shared_lock lock(mMutex);
uint32_t baseIP = 0x0A0A0002; // 10.10.0.2
// TODO: Expand to support larger subnets
for (uint32_t offset = 0; offset < 254; offset++) {
uint32_t candidateIP = baseIP + offset;
if (mSessionIPs.find(candidateIP) == mSessionIPs.end()) {
return candidateIP;
}
}
}
void lockIP(uint64_t sessionID, uint32_t ip) {
std::unique_lock lock(mMutex);
mSessionIPs[sessionID] = ip;
}
void deallocIP(uint64_t sessionID) {
std::unique_lock lock(mMutex);
mSessionIPs.erase(sessionID);
}
private:
mutable std::shared_mutex mMutex;
std::unordered_map<uint64_t, std::shared_ptr<SessionState>> mSessions;
std::unordered_map<uint64_t, uint32_t> mSessionIPs;
std::unordered_map<uint32_t, std::shared_ptr<SessionState>> mIPSessions;
};
}

25
include/columnlynx/common/net/virtual_interface.hpp
View File

@@ -17,6 +17,7 @@
#include <sys/ioctl.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <arpa/inet.h>
#elif defined(__APPLE__)
#include <sys/socket.h>
#include <sys/kern_control.h>
@@ -24,8 +25,11 @@
#include <net/if_utun.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <arpa/inet.h>
#elif defined(_WIN32)
#include <windows.h>
#include <ws2tcpip.h>
#include <winsock2.h>
#include <wintun/wintun.h>
#pragma comment(lib, "advapi32.lib")
#endif
@@ -36,12 +40,31 @@ namespace ColumnLynx::Net {
explicit VirtualInterface(const std::string& ifName);
~VirtualInterface();
bool configureIP(uint32_t clientIP, uint32_t serverIP,
uint8_t prefixLen, uint16_t mtu);
std::vector<uint8_t> readPacket();
void writePacket(const std::vector<uint8_t>& packet);
const std::string& getName() const;
int getFd() const; // for ASIO integration (on POSIX)
int getFd() const; // For ASIO integration (on POSIX)
static inline std::string ipToString(uint32_t ip) {
struct in_addr addr;
addr.s_addr = ip; // expected in network byte order
char buf[INET_ADDRSTRLEN];
if (!inet_ntop(AF_INET, &addr, buf, sizeof(buf)))
return "0.0.0.0";
return std::string(buf);
}
private:
bool mApplyLinuxIP(uint32_t clientIP, uint32_t serverIP, uint8_t prefixLen, uint16_t mtu);
bool mApplyMacOSIP(uint32_t clientIP, uint32_t serverIP, uint8_t prefixLen, uint16_t mtu);
bool mApplyWindowsIP(uint32_t clientIP, uint32_t serverIP, uint8_t prefixLen, uint16_t mtu);
std::string mIfName;
int mFd; // POSIX
#if defined(_WIN32)

1
include/columnlynx/server/net/tcp/tcp_connection.hpp
View File

@@ -16,6 +16,7 @@
#include <columnlynx/common/utils.hpp>
#include <columnlynx/common/libsodium_wrapper.hpp>
#include <columnlynx/common/net/session_registry.hpp>
#include <columnlynx/common/net/protocol_structs.hpp>
namespace ColumnLynx::Net::TCP {
class TCPConnection : public std::enable_shared_from_this<TCPConnection> {

1
include/columnlynx/server/net/tcp/tcp_server.hpp
View File

@@ -16,6 +16,7 @@
#include <columnlynx/common/utils.hpp>
#include <columnlynx/server/net/tcp/tcp_connection.hpp>
#include <columnlynx/common/libsodium_wrapper.hpp>
#include <columnlynx/common/net/protocol_structs.hpp>
namespace ColumnLynx::Net::TCP {

9
include/columnlynx/server/net/udp/udp_server.hpp
View File

@@ -8,12 +8,13 @@
#include <columnlynx/common/net/udp/udp_message_type.hpp>
#include <columnlynx/common/utils.hpp>
#include <array>
#include <columnlynx/common/net/virtual_interface.hpp>
namespace ColumnLynx::Net::UDP {
class UDPServer {
public:
UDPServer(asio::io_context& ioContext, uint16_t port, bool* hostRunning, bool ipv4Only = false)
: mSocket(ioContext), mHostRunning(hostRunning)
UDPServer(asio::io_context& ioContext, uint16_t port, bool* hostRunning, bool ipv4Only = false, VirtualInterface* tun = nullptr)
: mSocket(ioContext), mHostRunning(hostRunning), mTun(tun)
{
asio::error_code ec;
@@ -43,13 +44,15 @@ namespace ColumnLynx::Net::UDP {
void stop();
void sendData(const uint64_t sessionID, const std::string& data);
private:
void mStartReceive();
void mHandlePacket(std::size_t bytes);
void mSendData(const uint64_t sessionID, const std::string& data);
asio::ip::udp::socket mSocket;
asio::ip::udp::endpoint mRemoteEndpoint;
std::array<uint8_t, 2048> mRecvBuffer; // Adjust size as needed
bool* mHostRunning;
VirtualInterface* mTun;
};
}

34
src/client/main.cpp
View File

@@ -15,6 +15,7 @@
using asio::ip::tcp;
using namespace ColumnLynx::Utils;
using namespace ColumnLynx::Net;
using namespace ColumnLynx;
volatile sig_atomic_t done = 0;
@@ -62,7 +63,7 @@ int main(int argc, char** argv) {
WintunInitialize();
#endif
VirtualInterface tun("columnlynxtun0");
VirtualInterface tun("utun1");
log("Using virtual interface: " + tun.getName());
LibSodiumWrapper sodiumWrapper = LibSodiumWrapper();
@@ -71,8 +72,8 @@ int main(int argc, char** argv) {
uint64_t sessionID = 0;
asio::io_context io;
auto client = std::make_shared<ColumnLynx::Net::TCP::TCPClient>(io, host, port, &sodiumWrapper, &aesKey, &sessionID, &insecureMode);
auto udpClient = std::make_shared<ColumnLynx::Net::UDP::UDPClient>(io, host, port, &aesKey, &sessionID);
auto client = std::make_shared<ColumnLynx::Net::TCP::TCPClient>(io, host, port, &sodiumWrapper, &aesKey, &sessionID, &insecureMode, &tun);
auto udpClient = std::make_shared<ColumnLynx::Net::UDP::UDPClient>(io, host, port, &aesKey, &sessionID, &tun);
client->start();
udpClient->start();
@@ -88,18 +89,25 @@ int main(int argc, char** argv) {
// Client is running
// TODO: SIGINT or SIGTERM seems to not kill this instantly!
while ((client->isConnected() || !client->isHandshakeComplete()) && !done) {
std::this_thread::sleep_for(std::chrono::milliseconds(100)); // Temp wait
auto packet = tun.readPacket();
if (client->isHandshakeComplete()) {
// Send a test UDP message every 5 seconds after handshake is complete
static auto lastSendTime = std::chrono::steady_clock::now();
auto now = std::chrono::steady_clock::now();
if (std::chrono::duration_cast<std::chrono::seconds>(now - lastSendTime).count() >= 5) {
udpClient->sendMessage("Hello from UDP client!");
lastSendTime = now;
}
}
Nonce nonce{};
randombytes_buf(nonce.data(), nonce.size());
auto ciphertext = LibSodiumWrapper::encryptMessage(
packet.data(), packet.size(),
aesKey,
nonce,
"udp-data"
);
std::vector<uint8_t> udpPayload;
udpPayload.insert(udpPayload.end(), nonce.begin(), nonce.end());
udpPayload.insert(udpPayload.end(), reinterpret_cast<uint8_t*>(&sessionID), reinterpret_cast<uint8_t*>(&sessionID) + sizeof(sessionID));
udpPayload.insert(udpPayload.end(), ciphertext.begin(), ciphertext.end());
udpClient->sendMessage(std::string(udpPayload.begin(), udpPayload.end()));
}
log("Client shutting down.");
udpClient->stop();
client->disconnect();

14
src/client/net/tcp/tcp_client.cpp
View File

@@ -239,19 +239,29 @@ namespace ColumnLynx::Net::TCP {
mConnectionAESKey, symNonce
);
if (decrypted.size() != sizeof(mConnectionSessionID)) {
Utils::error("Decrypted session ID has invalid size. Terminating connection.");
if (decrypted.size() != sizeof(mConnectionSessionID) + sizeof(Protocol::TunConfig)) {
Utils::error("Decrypted config has invalid size. Terminating connection.");
disconnect();
return;
}
std::memcpy(&mConnectionSessionID, decrypted.data(), sizeof(mConnectionSessionID));
std::memcpy(&mTunConfig, decrypted.data() + sizeof(mConnectionSessionID), sizeof(Protocol::TunConfig));
Utils::log("Connection established with Session ID: " + std::to_string(mConnectionSessionID));
if (mSessionIDRef) { // Copy to the global reference
*mSessionIDRef = mConnectionSessionID;
}
uint32_t clientIP = ntohl(mTunConfig.clientIP);
uint32_t serverIP = ntohl(mTunConfig.serverIP);
uint8_t prefixLen = mTunConfig.prefixLength;
uint16_t mtu = mTunConfig.mtu;
if (mTun) {
mTun->configureIP(clientIP, serverIP, prefixLen, mtu);
}
mHandshakeComplete = true;
}

5
src/client/net/udp/udp_client.cpp
View File

@@ -107,5 +107,10 @@ namespace ColumnLynx::Net::UDP {
}
Utils::log("UDP Client received packet from " + mRemoteEndpoint.address().to_string() + " - Packet size: " + std::to_string(bytes));
// Write to TUN
if (mTunRef) {
mTunRef->writePacket(plaintext);
}
}
}

84
src/common/virtual_interface.cpp
View File

@@ -128,4 +128,88 @@ namespace ColumnLynx::Net {
const std::string& VirtualInterface::getName() const { return mIfName; }
int VirtualInterface::getFd() const { return mFd; }
// ------------------------------------------------------------
// IP CONFIGURATION
// ------------------------------------------------------------
bool VirtualInterface::configureIP(uint32_t clientIP, uint32_t serverIP,
uint8_t prefixLen, uint16_t mtu)
{
#if defined(__linux__)
return mApplyLinuxIP(clientIP, serverIP, prefixLen, mtu);
#elif defined(__APPLE__)
return mApplyMacOSIP(clientIP, serverIP, prefixLen, mtu);
#elif defined(_WIN32)
return mApplyWindowsIP(clientIP, serverIP, prefixLen, mtu);
#else
return false;
#endif
}
// ------------------------------------------------------------
// Linux
// ------------------------------------------------------------
bool VirtualInterface::mApplyLinuxIP(uint32_t clientIP, uint32_t serverIP,
uint8_t prefixLen, uint16_t mtu)
{
char cmd[512];
std::string ipStr = ipToString(clientIP);
std::string peerStr = ipToString(serverIP);
snprintf(cmd, sizeof(cmd),
"ip addr add %s/%d peer %s dev %s",
ipStr.c_str(), prefixLen, peerStr.c_str(), mIfName.c_str());
system(cmd);
snprintf(cmd, sizeof(cmd),
"ip link set dev %s up mtu %d", mIfName.c_str(), mtu);
system(cmd);
return true;
}
// ------------------------------------------------------------
// macOS (utun)
// ------------------------------------------------------------
bool VirtualInterface::mApplyMacOSIP(uint32_t clientIP, uint32_t serverIP,
uint8_t prefixLen, uint16_t mtu)
{
char cmd[512];
std::string ipStr = ipToString(clientIP);
std::string peerStr = ipToString(serverIP);
snprintf(cmd, sizeof(cmd),
"ifconfig utun0 %s %s mtu %d up",
ipStr.c_str(), peerStr.c_str(), mtu);
system(cmd);
return true;
}
// ------------------------------------------------------------
// Windows (Wintun)
// ------------------------------------------------------------
bool VirtualInterface::mApplyWindowsIP(uint32_t clientIP, uint32_t serverIP,
uint8_t prefixLen, uint16_t mtu)
{
#ifdef _WIN32
char ip[32], gw[32];
strcpy(ip, ipToString(clientIP).c_str());
strcpy(gw, ipToString(serverIP).c_str());
char cmd[256];
snprintf(cmd, sizeof(cmd),
"netsh interface ip set address name=\"%s\" static %s %d.%d.%d.%d",
mIfName.c_str(), ip,
(prefixLen <= 8) ? ((prefixLen << 3) & 255) : 255,
255, 255, 255);
system(cmd);
return true;
#else
return false;
#endif
}
} // namespace ColumnLynx::Net

28
src/server/main.cpp
View File

@@ -11,11 +11,14 @@
#include <columnlynx/common/libsodium_wrapper.hpp>
#include <unordered_set>
#include <cxxopts/cxxopts.hpp>
#include <columnlynx/common/net/virtual_interface.hpp>
using asio::ip::tcp;
using namespace ColumnLynx::Utils;
using namespace ColumnLynx::Net::TCP;
using namespace ColumnLynx::Net::UDP;
using namespace ColumnLynx::Net;
using namespace ColumnLynx;
volatile sig_atomic_t done = 0;
@@ -54,6 +57,13 @@ int main(int argc, char** argv) {
log("ColumnLynx Server, Version " + getVersion());
log("This software is licensed under the GPLv2 only OR the GPLv3. See LICENSES/ for details.");
#if defined(__WIN32__)
WintunInitialize();
#endif
VirtualInterface tun("utun0");
log("Using virtual interface: " + tun.getName());
// Generate a temporary keypair, replace with actual CA signed keys later (Note, these are stored in memory)
LibSodiumWrapper sodiumWrapper = LibSodiumWrapper();
log("Server public key: " + bytesToHexString(sodiumWrapper.getPublicKey(), crypto_sign_PUBLICKEYBYTES));
@@ -64,7 +74,7 @@ int main(int argc, char** argv) {
asio::io_context io;
auto server = std::make_shared<TCPServer>(io, serverPort(), &sodiumWrapper, &hostRunning, ipv4Only);
auto udpServer = std::make_shared<UDPServer>(io, serverPort(), &hostRunning, ipv4Only);
auto udpServer = std::make_shared<UDPServer>(io, serverPort(), &hostRunning, ipv4Only, &tun);
asio::signal_set signals(io, SIGINT, SIGTERM);
signals.async_wait([&](const std::error_code&, int) {
@@ -87,7 +97,21 @@ int main(int argc, char** argv) {
log("Server started on port " + std::to_string(serverPort()));
while (!done) {
std::this_thread::sleep_for(std::chrono::milliseconds(100));
auto packet = tun.readPacket();
if (packet.empty()) {
continue;
}
const uint8_t* ip = packet.data();
uint32_t dstIP = ntohl(*(uint32_t*)(ip + 16)); // IPv4 destination address offset in IPv6-mapped header
auto session = SessionRegistry::getInstance().getByIP(dstIP);
if (!session) {
Utils::warn("TUN: No session found for destination IP " + VirtualInterface::ipToString(dstIP));
continue;
}
udpServer->sendData(session->sessionID, std::string(packet.begin(), packet.end()));
}
log("Shutting down server...");

28
src/server/server/net/tcp/tcp_connection.cpp
View File

@@ -41,6 +41,9 @@ namespace ColumnLynx::Net::TCP {
mHandler->socket().shutdown(asio::ip::tcp::socket::shutdown_both, ec);
mHandler->socket().close(ec);
SessionRegistry::getInstance().erase(mConnectionSessionID);
SessionRegistry::getInstance().deallocIP(mConnectionSessionID);
Utils::log("Closed connection to " + ip);
if (mOnDisconnect) {
@@ -174,16 +177,33 @@ namespace ColumnLynx::Net::TCP {
// Encrypt the Session ID with the established AES key (using symmetric encryption, nonce can be all zeros for this purpose)
Nonce symNonce{}; // All zeros
std::vector<uint8_t> encryptedSessionID = Utils::LibSodiumWrapper::encryptMessage(
reinterpret_cast<uint8_t*>(&mConnectionSessionID), sizeof(mConnectionSessionID),
uint32_t clientIP = SessionRegistry::getInstance().getFirstAvailableIP();
Protocol::TunConfig tunConfig{};
tunConfig.version = Utils::protocolVersion();
tunConfig.prefixLength = 24;
tunConfig.mtu = 1420;
tunConfig.serverIP = htonl(0x0A0A0001); // 10.10.0.1
tunConfig.clientIP = htonl(clientIP); // 10.10.0.X
tunConfig.dns1 = htonl(0x08080808); // 8.8.8.8
tunConfig.dns2 = 0;
SessionRegistry::getInstance().lockIP(mConnectionSessionID, clientIP);
std::vector<uint8_t> payload(sizeof(uint64_t) + sizeof(tunConfig));
std::memcpy(payload.data(), &mConnectionSessionID, sizeof(uint64_t));
std::memcpy(payload.data() + sizeof(uint64_t), &tunConfig, sizeof(tunConfig));
std::vector<uint8_t> encryptedPayload = Utils::LibSodiumWrapper::encryptMessage(
payload.data(), payload.size(),
mConnectionAESKey, symNonce
);
mHandler->sendMessage(ServerMessageType::HANDSHAKE_EXCHANGE_KEY_CONFIRM, Utils::uint8ArrayToString(encryptedSessionID.data(), encryptedSessionID.size()));
mHandler->sendMessage(ServerMessageType::HANDSHAKE_EXCHANGE_KEY_CONFIRM, Utils::uint8ArrayToString(encryptedPayload.data(), encryptedPayload.size()));
// Add to session registry
Utils::log("Handshake with " + reqAddr + " completed successfully. Session ID assigned.");
auto session = std::make_shared<SessionState>(mConnectionAESKey, std::chrono::hours(12));
auto session = std::make_shared<SessionState>(mConnectionAESKey, std::chrono::hours(12), clientIP, htonl(0x0A0A0001), mConnectionSessionID);
SessionRegistry::getInstance().put(mConnectionSessionID, std::move(session));
} catch (const std::exception& e) {

8
src/server/server/net/udp/udp_server.cpp
View File

@@ -62,16 +62,16 @@ namespace ColumnLynx::Net::UDP {
// For now, just log the decrypted payload
std::string payloadStr(plaintext.begin(), plaintext.end());
Utils::log("UDP: Received packet from " + mRemoteEndpoint.address().to_string() + " - Payload: " + payloadStr);
// TODO: Process the packet payload, for now just echo back
mSendData(sessionID, std::string(plaintext.begin(), plaintext.end()));
if (mTun) {
mTun->writePacket(plaintext); // Send to virtual interface
}
} catch (...) {
Utils::warn("UDP: Failed to decrypt payload from " + mRemoteEndpoint.address().to_string());
return;
}
}
void UDPServer::mSendData(const uint64_t sessionID, const std::string& data) {
void UDPServer::sendData(const uint64_t sessionID, const std::string& data) {
// Find the IPv4/IPv6 endpoint for the session
std::shared_ptr<const SessionState> session = SessionRegistry::getInstance().get(sessionID);
if (!session) {