LNXRNT/Sources/socket_bridge.cpp

#include "socket_bridge.h"
#include <kinc/log.h>
#include <map>
#include <memory>
#include <string>
#include <vector>

#ifdef _WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "wsock32.lib")
#ifdef WITH_SSL
#ifdef _WIN32
#define SECURITY_WIN32
#include <wincrypt.h>
#include <schannel.h>
#include <security.h>
#include <sspi.h>
#pragma comment(lib, "crypt32.lib")
#pragma comment(lib, "secur32.lib")
#endif
#endif
#else
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#ifdef WITH_SSL
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#endif
#endif

class RunTSocket {
public:
    int id;
    bool isBlocking;
    bool isConnected;
    bool isBound;
    bool isListening;
    std::string lastError;
    
#ifdef _WIN32
    SOCKET socket_fd;
#else
    int socket_fd;
#endif

#ifdef WITH_SSL
    #ifdef _WIN32
    // windows SChannel SSL support with opaque pointers
    void* ssl_cred_handle_;
    void* ssl_context_handle_;
    bool ssl_context_initialized_;
    std::vector<char> ssl_buffer_;  
    #else
    SSL* ssl;
    SSL_CTX* ssl_ctx;
    #endif
    bool useSSL;
#endif

    RunTSocket(int socket_id) : id(socket_id), isBlocking(true), isConnected(false), 
                               isBound(false), isListening(false) {
#ifdef _WIN32
        socket_fd = INVALID_SOCKET;
#else
        socket_fd = -1;
#endif

#ifdef WITH_SSL
        #ifdef _WIN32
        ssl_cred_handle_ = nullptr;
        ssl_context_handle_ = nullptr;
        ssl_context_initialized_ = false;
        #else
        ssl = nullptr;
        ssl_ctx = nullptr;
        #endif
        useSSL = false;
#endif
    }
    
    ~RunTSocket() {
        close();
    }
    
    void close() {
        if (isValid()) {
#ifdef WITH_SSL
            #ifdef _WIN32
            if (ssl_context_handle_) {
                ssl_context_handle_ = nullptr;
            }
            if (ssl_cred_handle_) {
                ssl_cred_handle_ = nullptr;
            }
            ssl_context_initialized_ = false;
            #else
            if (ssl) {
                SSL_shutdown(ssl);
                SSL_free(ssl);
                ssl = nullptr;
            }
            if (ssl_ctx) {
                SSL_CTX_free(ssl_ctx);
                ssl_ctx = nullptr;
            }
            #endif
#endif
#ifdef _WIN32
            shutdown(socket_fd, SD_SEND);
            closesocket(socket_fd);
            socket_fd = INVALID_SOCKET;
#else
            shutdown(socket_fd, SHUT_WR);
            ::close(socket_fd);
            socket_fd = -1;
#endif
        }
        isConnected = false;
        isBound = false;
        isListening = false;
    }
    
    bool isValid() const {
#ifdef _WIN32
        return socket_fd != INVALID_SOCKET;
#else
        return socket_fd >= 0;
#endif
    }
};

// global socket 
static std::map<int, std::unique_ptr<RunTSocket>> g_sockets;
static int g_next_socket_id = 1;
static bool g_winsock_initialized = false;

static bool initialize_networking() {
    if (g_winsock_initialized) return true;
    
#ifdef _WIN32
    WSADATA wsaData;
    int result = WSAStartup(MAKEWORD(2, 2), &wsaData);
    if (result != 0) {
        kinc_log(KINC_LOG_LEVEL_ERROR, "WSAStartup failed: %d", result);
        return false;
    }
#endif

#ifdef WITH_SSL
    #ifdef _WIN32
    // no global initialization needed for windows
    kinc_log(KINC_LOG_LEVEL_INFO, "Windows SChannel SSL support initialized");
    #else
    SSL_library_init();
    SSL_load_error_strings();
    OpenSSL_add_all_algorithms();
    kinc_log(KINC_LOG_LEVEL_INFO, "OpenSSL support initialized");
    #endif
#endif

    g_winsock_initialized = true;
    kinc_log(KINC_LOG_LEVEL_INFO, "Networking initialized successfully");
    return true;
}

static void cleanup_networking() {
    if (!g_winsock_initialized) return;
    
    g_sockets.clear();
    
#ifdef WITH_SSL
    #ifdef _WIN32
    kinc_log(KINC_LOG_LEVEL_INFO, "Windows SChannel SSL support cleaned up");
    #else
    EVP_cleanup();
    kinc_log(KINC_LOG_LEVEL_INFO, "OpenSSL support cleaned up");
    #endif
#endif

#ifdef _WIN32
    WSACleanup();
#endif
    
    g_winsock_initialized = false;
    kinc_log(KINC_LOG_LEVEL_INFO, "Networking cleaned up");
}

// C++ Bridge Function Implementations

extern "C" int runt_socket_create() {
    if (!initialize_networking()) {
        kinc_log(KINC_LOG_LEVEL_ERROR, "Failed to initialize networking");
        return -1;
    }
    
    int socket_id = g_next_socket_id++;
    auto socket = std::make_unique<RunTSocket>(socket_id);
    
#ifdef _WIN32
    socket->socket_fd = ::socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
    if (socket->socket_fd == INVALID_SOCKET) {
        int error = WSAGetLastError();
        kinc_log(KINC_LOG_LEVEL_ERROR, "Socket creation failed: %d", error);
        return -1;
    }
#else
    socket->socket_fd = ::socket(AF_INET, SOCK_STREAM, 0);
    if (socket->socket_fd < 0) {
        kinc_log(KINC_LOG_LEVEL_ERROR, "Socket creation failed: %s", strerror(errno));
        return -1;
    }
#endif
    
    int nodelay = 1;
    setsockopt(socket->socket_fd, IPPROTO_TCP, TCP_NODELAY, (const char*)&nodelay, sizeof(nodelay));
    
    int reuse = 1;
    setsockopt(socket->socket_fd, SOL_SOCKET, SO_REUSEADDR, (const char*)&reuse, sizeof(reuse));
    
#if defined(__linux__) && defined(SO_REUSEPORT)
    int reuseport = 1;
    setsockopt(socket->socket_fd, SOL_SOCKET, SO_REUSEPORT, (const char*)&reuseport, sizeof(reuseport));
#endif

    int keepalive = 1;
    setsockopt(socket->socket_fd, SOL_SOCKET, SO_KEEPALIVE, (const char*)&keepalive, sizeof(keepalive));
    
    // uWebsockets uses 1mb socket buffer sizes for high throughput
    int sndbuf = 1024 * 1024; 
    int rcvbuf = 1024 * 1024; 
    setsockopt(socket->socket_fd, SOL_SOCKET, SO_SNDBUF, (const char*)&sndbuf, sizeof(sndbuf));
    setsockopt(socket->socket_fd, SOL_SOCKET, SO_RCVBUF, (const char*)&rcvbuf, sizeof(rcvbuf));
    
#ifdef __APPLE__
    // prevent SIGPIPE crashes on macOS
    int no_sigpipe = 1;
    setsockopt(socket->socket_fd, SOL_SOCKET, SO_NOSIGPIPE, (const char*)&no_sigpipe, sizeof(no_sigpipe));
#endif
    
    g_sockets[socket_id] = std::move(socket);
    #ifdef DEBUG_NETWORK
    kinc_log(KINC_LOG_LEVEL_INFO, "Socket created successfully: ID %d", socket_id);
    #endif
    return socket_id;
}

extern "C" bool runt_socket_bind(int socket_id, const char* address, int port) {
    auto it = g_sockets.find(socket_id);
    if (it == g_sockets.end()) {
        kinc_log(KINC_LOG_LEVEL_ERROR, "Invalid socket ID: %d", socket_id);
        return false;
    }
    
    auto& socket = it->second;
    if (!socket->isValid()) {
        kinc_log(KINC_LOG_LEVEL_ERROR, "Socket not valid for bind: %d", socket_id);
        return false;
    }
    
    sockaddr_in addr;
    memset(&addr, 0, sizeof(addr));
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);
    
    if (address && strlen(address) > 0) {
        if (inet_pton(AF_INET, address, &addr.sin_addr) <= 0) {
            kinc_log(KINC_LOG_LEVEL_ERROR, "Invalid address: %s", address);
            return false;
        }
    } else {
        addr.sin_addr.s_addr = INADDR_ANY;
    }
    
    if (bind(socket->socket_fd, (sockaddr*)&addr, sizeof(addr)) < 0) {
#ifdef _WIN32
        int error = WSAGetLastError();
        kinc_log(KINC_LOG_LEVEL_ERROR, "Bind failed: %d", error);
#else
        kinc_log(KINC_LOG_LEVEL_ERROR, "Bind failed: %s", strerror(errno));
#endif
        return false;
    }
    
    socket->isBound = true;
    #ifdef DEBUG_NETWORK
    kinc_log(KINC_LOG_LEVEL_INFO, "Socket bound successfully: %s:%d", address ? address : "0.0.0.0", port);
    #endif
    return true;
}

extern "C" bool runt_socket_listen(int socket_id, int backlog) {
    auto it = g_sockets.find(socket_id);
    if (it == g_sockets.end()) return false;
    
    auto& socket = it->second;
    if (!socket->isValid() || !socket->isBound) return false;
    
    if (listen(socket->socket_fd, backlog) < 0) {
        kinc_log(KINC_LOG_LEVEL_ERROR, "Listen failed");
        return false;
    }
    
    socket->isListening = true;
    #ifdef DEBUG_NETWORK
    kinc_log(KINC_LOG_LEVEL_INFO, "Socket listening: ID %d", socket_id);
    #endif
    return true;
}

extern "C" int runt_socket_accept(int socket_id) {
    auto it = g_sockets.find(socket_id);
    if (it == g_sockets.end()) return -1;
    
    auto& socket = it->second;
    if (!socket->isValid() || !socket->isListening) return -1;
    
    sockaddr_in client_addr;
    socklen_t client_len = sizeof(client_addr);
    
#ifdef _WIN32
    SOCKET client_fd = accept(socket->socket_fd, (sockaddr*)&client_addr, &client_len);
    if (client_fd == INVALID_SOCKET) return -1;
#else
    int client_fd = accept(socket->socket_fd, (sockaddr*)&client_addr, &client_len);
    if (client_fd < 0) return -1;
#endif
    
    int client_id = g_next_socket_id++;
    auto client_socket = std::make_unique<RunTSocket>(client_id);
    client_socket->socket_fd = client_fd;
    client_socket->isConnected = true;
    
    int nodelay = 1;
    setsockopt(client_fd, IPPROTO_TCP, TCP_NODELAY, (const char*)&nodelay, sizeof(nodelay));
    
    int keepalive = 1;
    setsockopt(client_fd, SOL_SOCKET, SO_KEEPALIVE, (const char*)&keepalive, sizeof(keepalive));
    
    int sndbuf = 1024 * 1024;
    int rcvbuf = 1024 * 1024;
    setsockopt(client_fd, SOL_SOCKET, SO_SNDBUF, (const char*)&sndbuf, sizeof(sndbuf));
    setsockopt(client_fd, SOL_SOCKET, SO_RCVBUF, (const char*)&rcvbuf, sizeof(rcvbuf));
    
#ifdef __APPLE__
    int no_sigpipe = 1;
    setsockopt(client_fd, SOL_SOCKET, SO_NOSIGPIPE, (const char*)&no_sigpipe, sizeof(no_sigpipe));
#endif
    
    g_sockets[client_id] = std::move(client_socket);
    #ifdef DEBUG_NETWORK
    kinc_log(KINC_LOG_LEVEL_INFO, "Socket accepted: ID %d", client_id);
    #endif
    return client_id;
}

extern "C" bool runt_socket_connect(int socket_id, const char* hostname, int port) {
    auto it = g_sockets.find(socket_id);
    if (it == g_sockets.end()) {
        kinc_log(KINC_LOG_LEVEL_ERROR, "Invalid socket ID: %d", socket_id);
        return false;
    }
    
    auto& socket = it->second;
    if (!socket->isValid()) {
        kinc_log(KINC_LOG_LEVEL_ERROR, "Socket not valid for connect: %d", socket_id);
        return false;
    }
    
    #ifdef DEBUG_NETWORK
    kinc_log(KINC_LOG_LEVEL_INFO, "Connecting to %s:%d", hostname, port);
    #endif
    
    struct addrinfo hints, *result;
    memset(&hints, 0, sizeof(hints));
    hints.ai_family = AF_INET;
    hints.ai_socktype = SOCK_STREAM;
    
    char port_str[16];
    snprintf(port_str, sizeof(port_str), "%d", port);
    
    int status = getaddrinfo(hostname, port_str, &hints, &result);
    if (status != 0) {
        kinc_log(KINC_LOG_LEVEL_ERROR, "getaddrinfo failed for %s: %s", hostname, gai_strerror(status));
        return false;
    }
    
    bool connected = false;
    for (struct addrinfo* rp = result; rp != nullptr; rp = rp->ai_next) {
        if (connect(socket->socket_fd, rp->ai_addr, static_cast<int>(rp->ai_addrlen)) == 0) {
            connected = true;
            break;
        }
    }
    
    freeaddrinfo(result);
    
    if (!connected) {
#ifdef _WIN32
        int error = WSAGetLastError();
        kinc_log(KINC_LOG_LEVEL_ERROR, "Connect failed to %s:%d - Error: %d", hostname, port, error);
#else
        kinc_log(KINC_LOG_LEVEL_ERROR, "Connect failed to %s:%d - Error: %s", hostname, port, strerror(errno));
#endif
        return false;
    }
    
    socket->isConnected = true;
    #ifdef DEBUG_NETWORK
    kinc_log(KINC_LOG_LEVEL_INFO, "Connected successfully to %s:%d", hostname, port);
    #endif
    return true;
}

extern "C" int runt_socket_send(int socket_id, const char* data, int length) {
    auto it = g_sockets.find(socket_id);
    if (it == g_sockets.end()) return -1;
    
    auto& socket = it->second;
    if (!socket->isValid() || !socket->isConnected) return -1;
    
#ifdef WITH_SSL
    if (socket->useSSL) {
        #ifdef _WIN32
        // send implementation adapted from httprequest.cpp
        if (!socket->ssl_context_initialized_) {
            kinc_log(KINC_LOG_LEVEL_ERROR, "SSL context not initialized");
            return -1;
        }
        
        SecPkgContext_StreamSizes stream_sizes;
        SECURITY_STATUS status = QueryContextAttributesA(
            reinterpret_cast<PCtxtHandle>(socket->ssl_context_handle_),
            SECPKG_ATTR_STREAM_SIZES, &stream_sizes);
            
        if (status != SEC_E_OK) {
            kinc_log(KINC_LOG_LEVEL_ERROR, "Failed to get stream sizes: 0x%x", status);
            return -1;
        }
        
        int total_size = stream_sizes.cbHeader + length + stream_sizes.cbTrailer;
        char* encrypt_buffer = new char[total_size];
        
        SecBufferDesc message_desc;
        SecBuffer message_buffers[4];
        
        message_desc.ulVersion = SECBUFFER_VERSION;
        message_desc.cBuffers = 4;
        message_desc.pBuffers = message_buffers;
        
        message_buffers[0].BufferType = SECBUFFER_STREAM_HEADER;
        message_buffers[0].pvBuffer = encrypt_buffer;
        message_buffers[0].cbBuffer = stream_sizes.cbHeader;
        
        message_buffers[1].BufferType = SECBUFFER_DATA;
        message_buffers[1].pvBuffer = encrypt_buffer + stream_sizes.cbHeader;
        message_buffers[1].cbBuffer = length;
        memcpy(message_buffers[1].pvBuffer, data, length);
        
        message_buffers[2].BufferType = SECBUFFER_STREAM_TRAILER;
        message_buffers[2].pvBuffer = encrypt_buffer + stream_sizes.cbHeader + length;
        message_buffers[2].cbBuffer = stream_sizes.cbTrailer;
        
        message_buffers[3].BufferType = SECBUFFER_EMPTY;
        message_buffers[3].pvBuffer = nullptr;
        message_buffers[3].cbBuffer = 0;
        
        status = EncryptMessage(
            reinterpret_cast<PCtxtHandle>(socket->ssl_context_handle_),
            0, &message_desc, 0);
            
        if (status != SEC_E_OK) {
            kinc_log(KINC_LOG_LEVEL_ERROR, "SChannel encrypt failed: 0x%x", status);
            delete[] encrypt_buffer;
            return -1;
        }
        
        int total_encrypted = message_buffers[0].cbBuffer + message_buffers[1].cbBuffer + message_buffers[2].cbBuffer;
        int sent = send(socket->socket_fd, encrypt_buffer, total_encrypted, 0);
        
        delete[] encrypt_buffer;
        
        if (sent != total_encrypted) {
            kinc_log(KINC_LOG_LEVEL_ERROR, "Failed to send encrypted SSL data");
            return -1;
        }
        
        #ifdef DEBUG_NETWORK
        kinc_log(KINC_LOG_LEVEL_INFO, "SSL sent %d bytes (encrypted: %d bytes)", length, total_encrypted);
        #endif
        return length;
        #else
        if (socket->ssl) {
            int sent = SSL_write(socket->ssl, data, length);
            if (sent <= 0) {
                int ssl_error = SSL_get_error(socket->ssl, sent);
                kinc_log(KINC_LOG_LEVEL_ERROR, "SSL_write failed: %d", ssl_error);
                return -1;
            }
            return sent;
        }
        #endif
    }
#endif
    
#ifdef _WIN32
    int sent = send(socket->socket_fd, data, length, 0);
#else
    int sent = send(socket->socket_fd, data, length, MSG_NOSIGNAL);
#endif
    if (sent < 0) {
#ifdef _WIN32
        int error = WSAGetLastError();
        if (error == WSAEWOULDBLOCK) {
            return 0; 
        }
        // connection reset/aborted we mark as disconnected
        if (error == WSAECONNRESET || error == WSAECONNABORTED || error == WSAENETRESET) {
            socket->isConnected = false;
        }
        #ifdef DEBUG_NETWORK
        kinc_log(KINC_LOG_LEVEL_ERROR, "Send failed: %d", error);
        #endif
#else
        if (errno == EAGAIN || errno == EWOULDBLOCK) {
            return 0;
        }
        if (errno == ECONNRESET || errno == ENOTCONN || errno == EPIPE) {
            socket->isConnected = false;
        }
        #ifdef DEBUG_NETWORK
        kinc_log(KINC_LOG_LEVEL_ERROR, "Send failed: %s", strerror(errno));
        #endif
#endif
        return -1;
    }
    
    #ifdef DEBUG_NETWORK
    if (sent > 10) {
        kinc_log(KINC_LOG_LEVEL_INFO, "Sent %d bytes", sent);
    }
    #endif
    return sent;
}

extern "C" int runt_socket_recv(int socket_id, int max_length, char** out_data) {
    auto it = g_sockets.find(socket_id);
    if (it == g_sockets.end()) return -1;
    
    auto& socket = it->second;
    if (!socket->isValid() || !socket->isConnected) return -1;
    
    char* buffer = new char[max_length];
    
#ifdef WITH_SSL
    if (socket->useSSL) {
        #ifdef _WIN32
        if (!socket->ssl_context_initialized_) {
            delete[] buffer;
            kinc_log(KINC_LOG_LEVEL_ERROR, "SSL context not initialized");
            return -1;
        }
        
        while (true) {
            // decrypt for buffered data
            if (!socket->ssl_buffer_.empty()) {
                SecBufferDesc message_desc;
                SecBuffer message_buffers[4];
                
                // buffer descriptor for decryption
                message_desc.ulVersion = SECBUFFER_VERSION;
                message_desc.cBuffers = 4;
                message_desc.pBuffers = message_buffers;
                
                // input buffer with encrypted data
                message_buffers[0].BufferType = SECBUFFER_DATA;
                message_buffers[0].pvBuffer = socket->ssl_buffer_.data();
                message_buffers[0].cbBuffer = static_cast<unsigned long>(socket->ssl_buffer_.size());
                
                // output buffer
                message_buffers[1].BufferType = SECBUFFER_EMPTY;
                message_buffers[1].pvBuffer = nullptr;
                message_buffers[1].cbBuffer = 0;
                
                // extra buffer for leftover data
                message_buffers[2].BufferType = SECBUFFER_EMPTY;
                message_buffers[2].pvBuffer = nullptr;
                message_buffers[2].cbBuffer = 0;
                
                // stream buffer
                message_buffers[3].BufferType = SECBUFFER_EMPTY;
                message_buffers[3].pvBuffer = nullptr;
                message_buffers[3].cbBuffer = 0;
                
                SECURITY_STATUS status = DecryptMessage(
                    reinterpret_cast<PCtxtHandle>(socket->ssl_context_handle_),
                    &message_desc, 0, nullptr);
                
                if (status == SEC_E_OK) {
                    SecBuffer* data_buffer = nullptr;
                    SecBuffer* extra_buffer = nullptr;
                    
                    // find data and extra buffers
                    for (int i = 0; i < 4; i++) {
                        if (message_buffers[i].BufferType == SECBUFFER_DATA) {
                            data_buffer = &message_buffers[i];
                        } else if (message_buffers[i].BufferType == SECBUFFER_EXTRA) {
                            extra_buffer = &message_buffers[i];
                        }
                    }
                    
                    if (data_buffer && data_buffer->cbBuffer > 0) {
                        int bytes_to_copy = (max_length < static_cast<int>(data_buffer->cbBuffer)) ? max_length : static_cast<int>(data_buffer->cbBuffer);
                        memcpy(buffer, data_buffer->pvBuffer, bytes_to_copy);
                        
                        // move extra data to the beginning of the buffer
                        if (extra_buffer && extra_buffer->cbBuffer > 0) {
                            std::memmove(socket->ssl_buffer_.data(), extra_buffer->pvBuffer, extra_buffer->cbBuffer);
                            socket->ssl_buffer_.resize(extra_buffer->cbBuffer);
                        } else {
                            socket->ssl_buffer_.clear();
                        }
                        
                        *out_data = buffer;
                        #ifdef DEBUG_NETWORK
                        kinc_log(KINC_LOG_LEVEL_INFO, "SSL received %d bytes (decrypted)", bytes_to_copy);
                        #endif
                        return bytes_to_copy;
                    }
                    
                    socket->ssl_buffer_.clear();
                    
                } else if (status == SEC_E_INCOMPLETE_MESSAGE) {
                    // needs more from the socket
                    char recv_buffer[8192];
                    int received = recv(socket->socket_fd, recv_buffer, sizeof(recv_buffer), 0);
                    if (received <= 0) {
                        delete[] buffer;
                        if (received == 0) {
                            #ifdef DEBUG_NETWORK
                            kinc_log(KINC_LOG_LEVEL_INFO, "SSL connection closed by server");
                            #endif
                            return 0;
                        } else {
                            kinc_log(KINC_LOG_LEVEL_ERROR, "Failed to receive encrypted data for SSL read");
                            return -1;
                        }
                    }
                    
                    socket->ssl_buffer_.insert(socket->ssl_buffer_.end(), recv_buffer, recv_buffer + received);
                    continue;
                    
                } else {
                    delete[] buffer;
                    kinc_log(KINC_LOG_LEVEL_ERROR, "SChannel decrypt failed: 0x%x", status);
                    return -1;
                }
            }
            
            char recv_buffer[8192];
            int received = recv(socket->socket_fd, recv_buffer, sizeof(recv_buffer), 0);
            if (received <= 0) {
                delete[] buffer;
                if (received == 0) {
                    #ifdef DEBUG_NETWORK
                    kinc_log(KINC_LOG_LEVEL_INFO, "SSL connection closed by server (no buffered data)");
                    #endif
                    return 0;
                } else {
                    kinc_log(KINC_LOG_LEVEL_ERROR, "Failed to receive encrypted data");
                    return -1;
                }
            }
            
            socket->ssl_buffer_.insert(socket->ssl_buffer_.end(), recv_buffer, recv_buffer + received);
        }
        #else
        if (socket->ssl) {
            int received = SSL_read(socket->ssl, buffer, max_length);
            if (received <= 0) {
                delete[] buffer;
                int ssl_error = SSL_get_error(socket->ssl, received);
                if (ssl_error == SSL_ERROR_WANT_READ || ssl_error == SSL_ERROR_WANT_WRITE) {
                    return 0; 
                }
                kinc_log(KINC_LOG_LEVEL_ERROR, "SSL_read failed: %d", ssl_error);
                return -1;
            }
            *out_data = buffer;
            return received;
        }
        #endif
    }
#endif
    
    int received = recv(socket->socket_fd, buffer, max_length, 0);
    if (received < 0) {
#ifdef _WIN32
        int error = WSAGetLastError();
        if (error == WSAEWOULDBLOCK) {
            delete[] buffer;
            return 0; 
        }
        // WSAECONNRESET (10054) = connection reset by peer
        // WSAECONNABORTED (10053) = connection aborted
        // WSAENETRESET (10052) = Network dropped connection 
        // Treat all == disconnected
        if (error == WSAECONNRESET || error == WSAECONNABORTED || error == WSAENETRESET) {
            delete[] buffer;
            socket->isConnected = false;
            return -2; 
        }
        #ifdef DEBUG_NETWORK
        kinc_log(KINC_LOG_LEVEL_ERROR, "Recv failed: %d", error);
        #endif
#else
        if (errno == EAGAIN || errno == EWOULDBLOCK) {
            delete[] buffer;
            return 0; 
        }
        if (errno == ECONNRESET || errno == ENOTCONN || errno == EPIPE) {
            delete[] buffer;
            socket->isConnected = false;
            return -2; 
        }
        #ifdef DEBUG_NETWORK
        kinc_log(KINC_LOG_LEVEL_ERROR, "Recv failed: %s", strerror(errno));
        #endif
#endif
        delete[] buffer;
        return -1; 
    }
    
    if (received == 0) {
        delete[] buffer;
        socket->isConnected = false;
        #ifdef DEBUG_NETWORK
        kinc_log(KINC_LOG_LEVEL_INFO, "Connection closed by peer");
        #endif
        return -2; // Distinct value for connection closed
    }
    
    *out_data = buffer;
    #ifdef DEBUG_NETWORK
    kinc_log(KINC_LOG_LEVEL_INFO, "Received %d bytes", received);
    #endif
    return received;
}

extern "C" void runt_socket_close(int socket_id) {
    auto it = g_sockets.find(socket_id);
    if (it == g_sockets.end()) return;
    
    it->second->close();
    g_sockets.erase(it);
    #ifdef DEBUG_NETWORK
    kinc_log(KINC_LOG_LEVEL_INFO, "Socket closed: ID %d", socket_id);
    #endif
}

extern "C" bool runt_socket_is_connected(int socket_id) {
    auto it = g_sockets.find(socket_id);
    if (it == g_sockets.end()) return false;
    
    auto& socket = it->second;
    return socket->isValid() && socket->isConnected;
}

extern "C" void runt_socket_set_blocking(int socket_id, bool blocking) {
    auto it = g_sockets.find(socket_id);
    if (it == g_sockets.end()) return;
    
    auto& socket = it->second;
    if (!socket->isValid()) return;
    
#ifdef _WIN32
    u_long mode = blocking ? 0 : 1;
    ioctlsocket(socket->socket_fd, FIONBIO, &mode);
#else
    int flags = fcntl(socket->socket_fd, F_GETFL, 0);
    if (blocking) {
        flags &= ~O_NONBLOCK;
    } else {
        flags |= O_NONBLOCK;
    }
    fcntl(socket->socket_fd, F_SETFL, flags);
#endif
    
    socket->isBlocking = blocking;
    #ifdef DEBUG_NETWORK
    kinc_log(KINC_LOG_LEVEL_INFO, "Socket blocking mode set: %s", blocking ? "blocking" : "non-blocking");
    #endif
}

extern "C" bool runt_socket_select(int socket_id, double timeout_sec) {
    auto it = g_sockets.find(socket_id);
    if (it == g_sockets.end()) return false;
    
    auto& socket = it->second;
    if (!socket->isValid()) return false;
    
    fd_set readfds;
    FD_ZERO(&readfds);
    FD_SET(socket->socket_fd, &readfds);
    
    struct timeval tv;
    tv.tv_sec = (long)timeout_sec;
    tv.tv_usec = (long)((timeout_sec - tv.tv_sec) * 1000000);
    
    int result = ::select((int)socket->socket_fd + 1, &readfds, nullptr, nullptr, &tv);
    
    if (result > 0 && FD_ISSET(socket->socket_fd, &readfds)) {
        return true;
    }
    return false;
}

#ifdef WITH_SSL
extern "C" bool runt_socket_enable_ssl(int socket_id) {
    auto it = g_sockets.find(socket_id);
    if (it == g_sockets.end()) return false;
    
    auto& socket = it->second;
    if (!socket->isValid() || !socket->isConnected) return false;
    
#ifdef _WIN32
    if (socket->useSSL) return true; 
    
    if (!socket->ssl_cred_handle_) {
        socket->ssl_cred_handle_ = new CredHandle();
        memset(socket->ssl_cred_handle_, 0, sizeof(CredHandle));
        
        SCHANNEL_CRED credentials;
        memset(&credentials, 0, sizeof(credentials));
        credentials.dwVersion = SCHANNEL_CRED_VERSION;
        credentials.grbitEnabledProtocols = SP_PROT_TLS1_2;
        credentials.dwFlags = SCH_CRED_NO_DEFAULT_CREDS | SCH_CRED_MANUAL_CRED_VALIDATION;
        
        TimeStamp expiry;
        SECURITY_STATUS status = AcquireCredentialsHandleA(
            nullptr, const_cast<char*>(UNISP_NAME_A), SECPKG_CRED_OUTBOUND,
            nullptr, &credentials, nullptr, nullptr,
            reinterpret_cast<PCredHandle>(socket->ssl_cred_handle_), &expiry);
            
        if (status != SEC_E_OK) {
            kinc_log(KINC_LOG_LEVEL_ERROR, "AcquireCredentialsHandleA failed: 0x%x", status);
            delete reinterpret_cast<CredHandle*>(socket->ssl_cred_handle_);
            socket->ssl_cred_handle_ = nullptr;
            return false;
        }
        kinc_log(KINC_LOG_LEVEL_INFO, "SSL credentials acquired successfully");
    }
    
    SecBufferDesc outbuffer_desc;
    SecBuffer outbuffers[1];
    DWORD context_attributes;
    TimeStamp expiry;
    
    outbuffers[0].pvBuffer = nullptr;
    outbuffers[0].BufferType = SECBUFFER_TOKEN;
    outbuffers[0].cbBuffer = 0;
    outbuffer_desc.cBuffers = 1;
    outbuffer_desc.pBuffers = outbuffers;
    outbuffer_desc.ulVersion = SECBUFFER_VERSION;
    
    socket->ssl_context_handle_ = new CtxtHandle();
    memset(socket->ssl_context_handle_, 0, sizeof(CtxtHandle));
    

    // TODO: Use actual hostname
    SECURITY_STATUS status = InitializeSecurityContextA(
        reinterpret_cast<PCredHandle>(socket->ssl_cred_handle_),
        nullptr, 
        const_cast<char*>("localhost"),  
        ISC_REQ_SEQUENCE_DETECT | ISC_REQ_REPLAY_DETECT | 
        ISC_REQ_CONFIDENTIALITY | ISC_REQ_EXTENDED_ERROR | 
        ISC_REQ_ALLOCATE_MEMORY | ISC_REQ_STREAM,
        0, SECURITY_NATIVE_DREP, nullptr, 0,
        reinterpret_cast<PCtxtHandle>(socket->ssl_context_handle_),
        &outbuffer_desc, &context_attributes, &expiry);
        
    if (status == SEC_I_CONTINUE_NEEDED || status == SEC_E_OK) {
        // send handshake data if available
        if (outbuffers[0].cbBuffer > 0 && outbuffers[0].pvBuffer) {
            int sent = send(socket->socket_fd, reinterpret_cast<char*>(outbuffers[0].pvBuffer), outbuffers[0].cbBuffer, 0);
            if (sent != static_cast<int>(outbuffers[0].cbBuffer)) {
                kinc_log(KINC_LOG_LEVEL_ERROR, "Failed to send SSL handshake data");
                FreeContextBuffer(outbuffers[0].pvBuffer);
                return false;
            }
            FreeContextBuffer(outbuffers[0].pvBuffer);
        }
        
        socket->ssl_context_initialized_ = true;
        kinc_log(KINC_LOG_LEVEL_INFO, "SSL handshake initiated successfully");
    } else {
        kinc_log(KINC_LOG_LEVEL_ERROR, "InitializeSecurityContextA failed: 0x%x", status);
        delete reinterpret_cast<CtxtHandle*>(socket->ssl_context_handle_);
        socket->ssl_context_handle_ = nullptr;
        return false;
    }
#else
    if (socket->ssl) return true; 
    socket->ssl_ctx = SSL_CTX_new(TLS_client_method());
    if (!socket->ssl_ctx) {
        kinc_log(KINC_LOG_LEVEL_ERROR, "SSL_CTX_new failed");
        return false;
    }
    
    socket->ssl = SSL_new(socket->ssl_ctx);
    if (!socket->ssl) {
        kinc_log(KINC_LOG_LEVEL_ERROR, "SSL_new failed");
        SSL_CTX_free(socket->ssl_ctx);
        socket->ssl_ctx = nullptr;
        return false;
    }
    
    SSL_set_fd(socket->ssl, socket->socket_fd);
    
    int ret = SSL_connect(socket->ssl);
    if (ret <= 0) {
        int ssl_error = SSL_get_error(socket->ssl, ret);
        kinc_log(KINC_LOG_LEVEL_ERROR, "SSL_connect failed: %d", ssl_error);
        SSL_free(socket->ssl);
        SSL_CTX_free(socket->ssl_ctx);
        socket->ssl = nullptr;
        socket->ssl_ctx = nullptr;
        return false;
    }
#endif
    
    socket->useSSL = true;
    kinc_log(KINC_LOG_LEVEL_INFO, "SSL enabled successfully for socket %d", socket_id);
    return true;
}
#endif

extern "C" void runt_socket_cleanup() {
    cleanup_networking();
}