/** * SMTP Connection Manager * Responsible for managing socket connections to the SMTP server */ import * as plugins from '../../../plugins.js'; import { SmtpResponseCode, SMTP_DEFAULTS, SmtpState } from './constants.js'; import { SmtpLogger } from './utils/logging.js'; import { adaptiveLogger } from './utils/adaptive-logging.js'; import { getSocketDetails, formatMultilineResponse } from './utils/helpers.js'; /** * Manager for SMTP connections * Handles connection setup, event listeners, and lifecycle management * Provides resource management, connection tracking, and monitoring */ export class ConnectionManager { /** * Reference to the SMTP server instance */ smtpServer; /** * Set of active socket connections */ activeConnections = new Set(); /** * Connection tracking for resource management */ connectionStats = { totalConnections: 0, activeConnections: 0, peakConnections: 0, rejectedConnections: 0, closedConnections: 0, erroredConnections: 0, timedOutConnections: 0 }; /** * Per-IP connection tracking for rate limiting */ ipConnections = new Map(); /** * Resource monitoring interval */ resourceCheckInterval = null; /** * Track cleanup timers so we can clear them */ cleanupTimers = new Set(); /** * SMTP server options with enhanced resource controls */ options; /** * Creates a new connection manager with enhanced resource management * @param smtpServer - SMTP server instance */ constructor(smtpServer) { this.smtpServer = smtpServer; // Get options from server const serverOptions = this.smtpServer.getOptions(); // Default values for resource management - adjusted for production scalability const DEFAULT_MAX_CONNECTIONS_PER_IP = 50; // Increased to support high-concurrency scenarios const DEFAULT_CONNECTION_RATE_LIMIT = 200; // Increased for production load handling const DEFAULT_CONNECTION_RATE_WINDOW = 60 * 1000; // 60 seconds window const DEFAULT_BUFFER_SIZE_LIMIT = 10 * 1024 * 1024; // 10 MB const DEFAULT_RESOURCE_CHECK_INTERVAL = 30 * 1000; // 30 seconds this.options = { hostname: serverOptions.hostname || SMTP_DEFAULTS.HOSTNAME, maxConnections: serverOptions.maxConnections || SMTP_DEFAULTS.MAX_CONNECTIONS, socketTimeout: serverOptions.socketTimeout || SMTP_DEFAULTS.SOCKET_TIMEOUT, maxConnectionsPerIP: DEFAULT_MAX_CONNECTIONS_PER_IP, connectionRateLimit: DEFAULT_CONNECTION_RATE_LIMIT, connectionRateWindow: DEFAULT_CONNECTION_RATE_WINDOW, bufferSizeLimit: DEFAULT_BUFFER_SIZE_LIMIT, resourceCheckInterval: DEFAULT_RESOURCE_CHECK_INTERVAL }; // Start resource monitoring this.startResourceMonitoring(); } /** * Start resource monitoring interval to check resource usage */ startResourceMonitoring() { // Clear any existing interval if (this.resourceCheckInterval) { clearInterval(this.resourceCheckInterval); } // Set up new interval this.resourceCheckInterval = setInterval(() => { this.monitorResourceUsage(); }, this.options.resourceCheckInterval); } /** * Monitor resource usage and log statistics */ monitorResourceUsage() { // Calculate memory usage const memoryUsage = process.memoryUsage(); const memoryUsageMB = { rss: Math.round(memoryUsage.rss / 1024 / 1024), heapTotal: Math.round(memoryUsage.heapTotal / 1024 / 1024), heapUsed: Math.round(memoryUsage.heapUsed / 1024 / 1024), external: Math.round(memoryUsage.external / 1024 / 1024) }; // Calculate connection rate metrics const activeIPs = Array.from(this.ipConnections.entries()) .filter(([_, data]) => data.count > 0).length; const highVolumeIPs = Array.from(this.ipConnections.entries()) .filter(([_, data]) => data.count > this.options.connectionRateLimit / 2).length; // Log resource usage with more detailed metrics SmtpLogger.info('Resource usage stats', { connections: { active: this.activeConnections.size, total: this.connectionStats.totalConnections, peak: this.connectionStats.peakConnections, rejected: this.connectionStats.rejectedConnections, closed: this.connectionStats.closedConnections, errored: this.connectionStats.erroredConnections, timedOut: this.connectionStats.timedOutConnections }, memory: memoryUsageMB, ipTracking: { uniqueIPs: this.ipConnections.size, activeIPs: activeIPs, highVolumeIPs: highVolumeIPs }, resourceLimits: { maxConnections: this.options.maxConnections, maxConnectionsPerIP: this.options.maxConnectionsPerIP, connectionRateLimit: this.options.connectionRateLimit, bufferSizeLimit: Math.round(this.options.bufferSizeLimit / 1024 / 1024) + 'MB' } }); // Check for potential DoS conditions if (highVolumeIPs > 3) { SmtpLogger.warn(`Potential DoS detected: ${highVolumeIPs} IPs with high connection rates`); } // Assess memory usage trends if (memoryUsageMB.heapUsed > 500) { // Over 500MB heap used SmtpLogger.warn(`High memory usage detected: ${memoryUsageMB.heapUsed}MB heap used`); } // Clean up expired IP rate limits and validate resource tracking this.cleanupIpRateLimits(); } /** * Clean up expired IP rate limits and perform additional resource monitoring */ cleanupIpRateLimits() { const now = Date.now(); const windowThreshold = now - this.options.connectionRateWindow; let activeIps = 0; let removedEntries = 0; // Iterate through IP connections and manage entries for (const [ip, data] of this.ipConnections.entries()) { // If the last connection was before the window threshold + one extra window, remove the entry if (data.lastConnection < windowThreshold - this.options.connectionRateWindow) { // Remove stale entries to prevent memory growth this.ipConnections.delete(ip); removedEntries++; } // If last connection was before the window threshold, reset the count else if (data.lastConnection < windowThreshold) { if (data.count > 0) { // Reset but keep the IP in the map with a zero count this.ipConnections.set(ip, { count: 0, firstConnection: now, lastConnection: now }); } } else { // This IP is still active within the current window activeIps++; } } // Log cleanup activity if significant changes occurred if (removedEntries > 0) { SmtpLogger.debug(`IP rate limit cleanup: removed ${removedEntries} stale entries, ${this.ipConnections.size} remaining, ${activeIps} active in current window`); } // Check for memory leaks in connection tracking if (this.activeConnections.size > 0 && this.connectionStats.activeConnections !== this.activeConnections.size) { SmtpLogger.warn(`Connection tracking inconsistency detected: stats.active=${this.connectionStats.activeConnections}, actual=${this.activeConnections.size}`); // Fix the inconsistency this.connectionStats.activeConnections = this.activeConnections.size; } // Validate and clean leaked resources if needed this.validateResourceTracking(); } /** * Validate and repair resource tracking to prevent leaks */ validateResourceTracking() { // Prepare a detailed report if inconsistencies are found const inconsistenciesFound = []; // 1. Check active connections count matches activeConnections set size if (this.connectionStats.activeConnections !== this.activeConnections.size) { inconsistenciesFound.push({ issue: 'Active connection count mismatch', stats: this.connectionStats.activeConnections, actual: this.activeConnections.size, action: 'Auto-corrected' }); this.connectionStats.activeConnections = this.activeConnections.size; } // 2. Check for destroyed sockets in active connections let destroyedSocketsCount = 0; const socketsToRemove = []; for (const socket of this.activeConnections) { if (socket.destroyed) { destroyedSocketsCount++; socketsToRemove.push(socket); } } // Remove destroyed sockets from tracking for (const socket of socketsToRemove) { this.activeConnections.delete(socket); // Also ensure all listeners are removed try { socket.removeAllListeners(); } catch { // Ignore errors from removeAllListeners } } if (destroyedSocketsCount > 0) { inconsistenciesFound.push({ issue: 'Destroyed sockets in active list', count: destroyedSocketsCount, action: 'Removed from tracking' }); // Update active connections count after cleanup this.connectionStats.activeConnections = this.activeConnections.size; } // 3. Check for sessions without corresponding active connections const sessionCount = this.smtpServer.getSessionManager().getSessionCount(); if (sessionCount > this.activeConnections.size) { inconsistenciesFound.push({ issue: 'Orphaned sessions', sessions: sessionCount, connections: this.activeConnections.size, action: 'Session cleanup recommended' }); } // If any inconsistencies found, log a detailed report if (inconsistenciesFound.length > 0) { SmtpLogger.warn('Resource tracking inconsistencies detected and repaired', { inconsistencies: inconsistenciesFound }); } } /** * Handle a new connection with resource management * @param socket - Client socket */ async handleNewConnection(socket) { // Update connection stats this.connectionStats.totalConnections++; this.connectionStats.activeConnections = this.activeConnections.size + 1; if (this.connectionStats.activeConnections > this.connectionStats.peakConnections) { this.connectionStats.peakConnections = this.connectionStats.activeConnections; } // Get client IP const remoteAddress = socket.remoteAddress || '0.0.0.0'; // Use UnifiedRateLimiter for connection rate limiting const emailServer = this.smtpServer.getEmailServer(); const rateLimiter = emailServer.getRateLimiter(); // Check connection limit with UnifiedRateLimiter const connectionResult = rateLimiter.recordConnection(remoteAddress); if (!connectionResult.allowed) { this.rejectConnection(socket, connectionResult.reason || 'Rate limit exceeded'); this.connectionStats.rejectedConnections++; return; } // Still track IP connections locally for cleanup purposes this.trackIPConnection(remoteAddress); // Check if maximum global connections reached if (this.hasReachedMaxConnections()) { this.rejectConnection(socket, 'Too many connections'); this.connectionStats.rejectedConnections++; return; } // Add socket to active connections this.activeConnections.add(socket); // Set up socket options socket.setKeepAlive(true); socket.setTimeout(this.options.socketTimeout); // Explicitly set socket buffer sizes to prevent memory issues socket.setNoDelay(true); // Disable Nagle's algorithm for better responsiveness // Set limits on socket buffer size if supported by Node.js version try { // Here we set reasonable buffer limits to prevent memory exhaustion attacks const highWaterMark = 64 * 1024; // 64 KB // Note: Socket high water mark methods can't be set directly in newer Node.js versions // These would need to be set during socket creation or with a different API } catch (error) { // Ignore errors from older Node.js versions that don't support these methods SmtpLogger.debug(`Could not set socket buffer limits: ${error instanceof Error ? error.message : String(error)}`); } // Set up event handlers this.setupSocketEventHandlers(socket); // Create a session for this connection this.smtpServer.getSessionManager().createSession(socket, false); // Log the new connection using adaptive logger const socketDetails = getSocketDetails(socket); adaptiveLogger.logConnection(socket, 'connect'); // Update adaptive logger with current connection count adaptiveLogger.updateConnectionCount(this.connectionStats.activeConnections); // Send greeting this.sendGreeting(socket); } /** * Check if an IP has exceeded the rate limit * @param ip - Client IP address * @returns True if rate limited */ isIPRateLimited(ip) { const now = Date.now(); const ipData = this.ipConnections.get(ip); if (!ipData) { return false; // No previous connections } // Check if we're within the rate window const isWithinWindow = now - ipData.firstConnection <= this.options.connectionRateWindow; // If within window and count exceeds limit, rate limit is applied if (isWithinWindow && ipData.count >= this.options.connectionRateLimit) { SmtpLogger.warn(`Rate limit exceeded for IP ${ip}: ${ipData.count} connections in ${Math.round((now - ipData.firstConnection) / 1000)}s`); return true; } return false; } /** * Track a new connection from an IP * @param ip - Client IP address */ trackIPConnection(ip) { const now = Date.now(); const ipData = this.ipConnections.get(ip); if (!ipData) { // First connection from this IP this.ipConnections.set(ip, { count: 1, firstConnection: now, lastConnection: now }); } else { // Check if we need to reset the window if (now - ipData.lastConnection > this.options.connectionRateWindow) { // Reset the window this.ipConnections.set(ip, { count: 1, firstConnection: now, lastConnection: now }); } else { // Increment within the current window this.ipConnections.set(ip, { count: ipData.count + 1, firstConnection: ipData.firstConnection, lastConnection: now }); } } } /** * Check if an IP has reached its connection limit * @param ip - Client IP address * @returns True if limit reached */ hasReachedIPConnectionLimit(ip) { let ipConnectionCount = 0; // Count active connections from this IP for (const socket of this.activeConnections) { if (socket.remoteAddress === ip) { ipConnectionCount++; } } return ipConnectionCount >= this.options.maxConnectionsPerIP; } /** * Handle a new secure TLS connection with resource management * @param socket - Client TLS socket */ async handleNewSecureConnection(socket) { // Update connection stats this.connectionStats.totalConnections++; this.connectionStats.activeConnections = this.activeConnections.size + 1; if (this.connectionStats.activeConnections > this.connectionStats.peakConnections) { this.connectionStats.peakConnections = this.connectionStats.activeConnections; } // Get client IP const remoteAddress = socket.remoteAddress || '0.0.0.0'; // Use UnifiedRateLimiter for connection rate limiting const emailServer = this.smtpServer.getEmailServer(); const rateLimiter = emailServer.getRateLimiter(); // Check connection limit with UnifiedRateLimiter const connectionResult = rateLimiter.recordConnection(remoteAddress); if (!connectionResult.allowed) { this.rejectConnection(socket, connectionResult.reason || 'Rate limit exceeded'); this.connectionStats.rejectedConnections++; return; } // Still track IP connections locally for cleanup purposes this.trackIPConnection(remoteAddress); // Check if maximum global connections reached if (this.hasReachedMaxConnections()) { this.rejectConnection(socket, 'Too many connections'); this.connectionStats.rejectedConnections++; return; } // Add socket to active connections this.activeConnections.add(socket); // Set up socket options socket.setKeepAlive(true); socket.setTimeout(this.options.socketTimeout); // Explicitly set socket buffer sizes to prevent memory issues socket.setNoDelay(true); // Disable Nagle's algorithm for better responsiveness // Set limits on socket buffer size if supported by Node.js version try { // Here we set reasonable buffer limits to prevent memory exhaustion attacks const highWaterMark = 64 * 1024; // 64 KB // Note: Socket high water mark methods can't be set directly in newer Node.js versions // These would need to be set during socket creation or with a different API } catch (error) { // Ignore errors from older Node.js versions that don't support these methods SmtpLogger.debug(`Could not set socket buffer limits: ${error instanceof Error ? error.message : String(error)}`); } // Set up event handlers this.setupSocketEventHandlers(socket); // Create a session for this connection this.smtpServer.getSessionManager().createSession(socket, true); // Log the new secure connection using adaptive logger adaptiveLogger.logConnection(socket, 'connect'); // Update adaptive logger with current connection count adaptiveLogger.updateConnectionCount(this.connectionStats.activeConnections); // Send greeting this.sendGreeting(socket); } /** * Set up event handlers for a socket with enhanced resource management * @param socket - Client socket */ setupSocketEventHandlers(socket) { // Store existing socket event handlers before adding new ones const existingDataHandler = socket.listeners('data')[0]; const existingCloseHandler = socket.listeners('close')[0]; const existingErrorHandler = socket.listeners('error')[0]; const existingTimeoutHandler = socket.listeners('timeout')[0]; // Remove existing event handlers if they exist if (existingDataHandler) socket.removeListener('data', existingDataHandler); if (existingCloseHandler) socket.removeListener('close', existingCloseHandler); if (existingErrorHandler) socket.removeListener('error', existingErrorHandler); if (existingTimeoutHandler) socket.removeListener('timeout', existingTimeoutHandler); // Data event - process incoming data from the client with resource limits let buffer = ''; let totalBytesReceived = 0; socket.on('data', async (data) => { try { // Get current session and update activity timestamp const session = this.smtpServer.getSessionManager().getSession(socket); if (session) { this.smtpServer.getSessionManager().updateSessionActivity(session); } // Check if we're in DATA receiving mode - handle differently if (session && session.state === SmtpState.DATA_RECEIVING) { // In DATA mode, pass raw chunks directly to command handler with special marker // Don't line-buffer large email content try { const dataString = data.toString('utf8'); // Use a special prefix to indicate this is raw data, not a command line // CRITICAL FIX: Must await to prevent async pile-up await this.smtpServer.getCommandHandler().processCommand(socket, `__RAW_DATA__${dataString}`); return; } catch (dataError) { SmtpLogger.error(`Data handler error during DATA mode: ${dataError instanceof Error ? dataError.message : String(dataError)}`); socket.destroy(); return; } } // For command mode, continue with line-buffered processing // Check buffer size limits to prevent memory attacks totalBytesReceived += data.length; if (buffer.length > this.options.bufferSizeLimit) { // Buffer is too large, reject the connection SmtpLogger.warn(`Buffer size limit exceeded: ${buffer.length} bytes for ${socket.remoteAddress}`); this.sendResponse(socket, `${SmtpResponseCode.EXCEEDED_STORAGE} Message too large, disconnecting`); socket.destroy(); return; } // Impose a total transfer limit to prevent DoS if (totalBytesReceived > this.options.bufferSizeLimit * 2) { SmtpLogger.warn(`Total transfer limit exceeded: ${totalBytesReceived} bytes for ${socket.remoteAddress}`); this.sendResponse(socket, `${SmtpResponseCode.EXCEEDED_STORAGE} Transfer limit exceeded, disconnecting`); socket.destroy(); return; } // Convert buffer to string safely with explicit encoding const dataString = data.toString('utf8'); // Buffer incoming data buffer += dataString; // Process complete lines let lineEndPos; while ((lineEndPos = buffer.indexOf(SMTP_DEFAULTS.CRLF)) !== -1) { // Extract a complete line const line = buffer.substring(0, lineEndPos); buffer = buffer.substring(lineEndPos + 2); // +2 to skip CRLF // Check line length to prevent extremely long lines if (line.length > 4096) { // 4KB line limit is reasonable for SMTP SmtpLogger.warn(`Line length limit exceeded: ${line.length} bytes for ${socket.remoteAddress}`); this.sendResponse(socket, `${SmtpResponseCode.SYNTAX_ERROR} Line too long, disconnecting`); socket.destroy(); return; } // Process non-empty lines if (line.length > 0) { try { // CRITICAL FIX: Must await processCommand to prevent async pile-up // This was causing the busy loop with high CPU usage when many empty lines were processed await this.smtpServer.getCommandHandler().processCommand(socket, line); } catch (error) { // Handle any errors in command processing SmtpLogger.error(`Command handler error: ${error instanceof Error ? error.message : String(error)}`); this.sendResponse(socket, `${SmtpResponseCode.LOCAL_ERROR} Internal server error`); // If there's a severe error, close the connection if (error instanceof Error && (error.message.includes('fatal') || error.message.includes('critical'))) { socket.destroy(); return; } } } } // If buffer is getting too large without CRLF, it might be a DoS attempt if (buffer.length > 10240) { // 10KB is a reasonable limit for a line without CRLF SmtpLogger.warn(`Incomplete line too large: ${buffer.length} bytes for ${socket.remoteAddress}`); this.sendResponse(socket, `${SmtpResponseCode.SYNTAX_ERROR} Incomplete line too large, disconnecting`); socket.destroy(); } } catch (error) { // Handle any unexpected errors during data processing SmtpLogger.error(`Data handler error: ${error instanceof Error ? error.message : String(error)}`); socket.destroy(); } }); // Add drain event handler to manage flow control socket.on('drain', () => { // Socket buffer has been emptied, resume data flow if needed if (socket.isPaused()) { socket.resume(); SmtpLogger.debug(`Resumed socket for ${socket.remoteAddress} after drain`); } }); // Close event - clean up when connection is closed socket.on('close', (hadError) => { this.handleSocketClose(socket, hadError); }); // Error event - handle socket errors socket.on('error', (err) => { this.handleSocketError(socket, err); }); // Timeout event - handle socket timeouts socket.on('timeout', () => { this.handleSocketTimeout(socket); }); } /** * Get the current connection count * @returns Number of active connections */ getConnectionCount() { return this.activeConnections.size; } /** * Check if the server has reached the maximum number of connections * @returns True if max connections reached */ hasReachedMaxConnections() { return this.activeConnections.size >= this.options.maxConnections; } /** * Close all active connections */ closeAllConnections() { const connectionCount = this.activeConnections.size; if (connectionCount === 0) { return; } SmtpLogger.info(`Closing all connections (count: ${connectionCount})`); for (const socket of this.activeConnections) { try { // Send service closing notification this.sendServiceClosing(socket); // End the socket gracefully socket.end(); // Force destroy after a short delay if not already destroyed const destroyTimer = setTimeout(() => { if (!socket.destroyed) { socket.destroy(); } this.cleanupTimers.delete(destroyTimer); }, 100); this.cleanupTimers.add(destroyTimer); } catch (error) { SmtpLogger.error(`Error closing connection: ${error instanceof Error ? error.message : String(error)}`); // Force destroy on error try { socket.destroy(); } catch (e) { // Ignore destroy errors } } } // Clear active connections this.activeConnections.clear(); // Stop resource monitoring to prevent hanging timers if (this.resourceCheckInterval) { clearInterval(this.resourceCheckInterval); this.resourceCheckInterval = null; } } /** * Handle socket close event * @param socket - Client socket * @param hadError - Whether the socket was closed due to error */ handleSocketClose(socket, hadError) { try { // Update connection statistics this.connectionStats.closedConnections++; this.connectionStats.activeConnections = this.activeConnections.size - 1; // Get socket details for logging const socketDetails = getSocketDetails(socket); const socketId = `${socketDetails.remoteAddress}:${socketDetails.remotePort}`; // Log with appropriate level based on whether there was an error if (hadError) { SmtpLogger.warn(`Socket closed with error: ${socketId}`); } else { SmtpLogger.debug(`Socket closed normally: ${socketId}`); } // Get the session before removing it const session = this.smtpServer.getSessionManager().getSession(socket); // Remove from active connections this.activeConnections.delete(socket); // Remove from session manager this.smtpServer.getSessionManager().removeSession(socket); // Cancel any timeout ID stored in the session if (session?.dataTimeoutId) { clearTimeout(session.dataTimeoutId); } // Remove all event listeners to prevent memory leaks socket.removeAllListeners(); // Log connection close with session details if available adaptiveLogger.logConnection(socket, 'close', session); // Update adaptive logger with new connection count adaptiveLogger.updateConnectionCount(this.connectionStats.activeConnections); } catch (error) { // Handle any unexpected errors during cleanup SmtpLogger.error(`Error in handleSocketClose: ${error instanceof Error ? error.message : String(error)}`); // Ensure socket is removed from active connections even if an error occurs this.activeConnections.delete(socket); // Always try to remove all listeners even on error try { socket.removeAllListeners(); } catch { // Ignore errors from removeAllListeners } } } /** * Handle socket error event * @param socket - Client socket * @param error - Error object */ handleSocketError(socket, error) { try { // Update connection statistics this.connectionStats.erroredConnections++; // Get socket details for context const socketDetails = getSocketDetails(socket); const socketId = `${socketDetails.remoteAddress}:${socketDetails.remotePort}`; // Get the session const session = this.smtpServer.getSessionManager().getSession(socket); // Detailed error logging with context information SmtpLogger.error(`Socket error for ${socketId}: ${error.message}`, { errorCode: error.code, errorStack: error.stack, sessionId: session?.id, sessionState: session?.state, remoteAddress: socketDetails.remoteAddress, remotePort: socketDetails.remotePort }); // Log the error for connection tracking using adaptive logger adaptiveLogger.logConnection(socket, 'error', session, error); // Cancel any timeout ID stored in the session if (session?.dataTimeoutId) { clearTimeout(session.dataTimeoutId); } // Close the socket if not already closed if (!socket.destroyed) { socket.destroy(); } // Remove from active connections (cleanup after error) this.activeConnections.delete(socket); // Remove from session manager this.smtpServer.getSessionManager().removeSession(socket); } catch (handlerError) { // Meta-error handling (errors in the error handler) SmtpLogger.error(`Error in handleSocketError: ${handlerError instanceof Error ? handlerError.message : String(handlerError)}`); // Ensure socket is destroyed and removed from active connections if (!socket.destroyed) { socket.destroy(); } this.activeConnections.delete(socket); } } /** * Handle socket timeout event * @param socket - Client socket */ handleSocketTimeout(socket) { try { // Update connection statistics this.connectionStats.timedOutConnections++; // Get socket details for context const socketDetails = getSocketDetails(socket); const socketId = `${socketDetails.remoteAddress}:${socketDetails.remotePort}`; // Get the session const session = this.smtpServer.getSessionManager().getSession(socket); // Get timing information for better debugging const now = Date.now(); const idleTime = session?.lastActivity ? now - session.lastActivity : 'unknown'; if (session) { // Log the timeout with extended details SmtpLogger.warn(`Socket timeout from ${session.remoteAddress}`, { sessionId: session.id, remoteAddress: session.remoteAddress, state: session.state, timeout: this.options.socketTimeout, idleTime: idleTime, emailState: session.envelope?.mailFrom ? 'has-sender' : 'no-sender', recipientCount: session.envelope?.rcptTo?.length || 0 }); // Cancel any timeout ID stored in the session if (session.dataTimeoutId) { clearTimeout(session.dataTimeoutId); } // Send timeout notification to client this.sendResponse(socket, `${SmtpResponseCode.SERVICE_NOT_AVAILABLE} Connection timeout - closing connection`); } else { // Log timeout without session context SmtpLogger.warn(`Socket timeout without session from ${socketId}`); } // Close the socket gracefully try { socket.end(); // Set a forced close timeout in case socket.end() doesn't close the connection const timeoutDestroyTimer = setTimeout(() => { if (!socket.destroyed) { SmtpLogger.warn(`Forcing destroy of timed out socket: ${socketId}`); socket.destroy(); } this.cleanupTimers.delete(timeoutDestroyTimer); }, 5000); // 5 second grace period for socket to end properly this.cleanupTimers.add(timeoutDestroyTimer); } catch (error) { SmtpLogger.error(`Error ending timed out socket: ${error instanceof Error ? error.message : String(error)}`); // Ensure socket is destroyed even if end() fails if (!socket.destroyed) { socket.destroy(); } } // Clean up resources this.activeConnections.delete(socket); this.smtpServer.getSessionManager().removeSession(socket); } catch (handlerError) { // Handle any unexpected errors during timeout handling SmtpLogger.error(`Error in handleSocketTimeout: ${handlerError instanceof Error ? handlerError.message : String(handlerError)}`); // Ensure socket is destroyed and removed from tracking if (!socket.destroyed) { socket.destroy(); } this.activeConnections.delete(socket); } } /** * Reject a connection * @param socket - Client socket * @param reason - Reason for rejection */ rejectConnection(socket, reason) { // Log the rejection const socketDetails = getSocketDetails(socket); SmtpLogger.warn(`Connection rejected from ${socketDetails.remoteAddress}:${socketDetails.remotePort}: ${reason}`); // Send rejection message this.sendResponse(socket, `${SmtpResponseCode.SERVICE_NOT_AVAILABLE} ${this.options.hostname} Service temporarily unavailable - ${reason}`); // Close the socket try { socket.end(); } catch (error) { SmtpLogger.error(`Error ending rejected socket: ${error instanceof Error ? error.message : String(error)}`); } } /** * Send greeting message * @param socket - Client socket */ sendGreeting(socket) { const greeting = `${SmtpResponseCode.SERVICE_READY} ${this.options.hostname} ESMTP service ready`; this.sendResponse(socket, greeting); } /** * Send service closing notification * @param socket - Client socket */ sendServiceClosing(socket) { const message = `${SmtpResponseCode.SERVICE_CLOSING} ${this.options.hostname} Service closing transmission channel`; this.sendResponse(socket, message); } /** * Send response to client * @param socket - Client socket * @param response - Response to send */ sendResponse(socket, response) { // Check if socket is still writable before attempting to write if (socket.destroyed || socket.readyState !== 'open' || !socket.writable) { SmtpLogger.debug(`Skipping response to closed/destroyed socket: ${response}`, { remoteAddress: socket.remoteAddress, remotePort: socket.remotePort, destroyed: socket.destroyed, readyState: socket.readyState, writable: socket.writable }); return; } try { socket.write(`${response}${SMTP_DEFAULTS.CRLF}`); adaptiveLogger.logResponse(response, socket); } catch (error) { // Log error and destroy socket SmtpLogger.error(`Error sending response: ${error instanceof Error ? error.message : String(error)}`, { response, remoteAddress: socket.remoteAddress, remotePort: socket.remotePort, error: error instanceof Error ? error : new Error(String(error)) }); socket.destroy(); } } /** * Handle a new connection (interface requirement) */ async handleConnection(socket, secure) { if (secure) { this.handleNewSecureConnection(socket); } else { this.handleNewConnection(socket); } } /** * Check if accepting new connections (interface requirement) */ canAcceptConnection() { return !this.hasReachedMaxConnections(); } /** * Clean up resources */ destroy() { // Clear resource monitoring interval if (this.resourceCheckInterval) { clearInterval(this.resourceCheckInterval); this.resourceCheckInterval = null; } // Clear all cleanup timers for (const timer of this.cleanupTimers) { clearTimeout(timer); } this.cleanupTimers.clear(); // Close all active connections this.closeAllConnections(); // Clear maps this.activeConnections.clear(); this.ipConnections.clear(); // Reset connection stats this.connectionStats = { totalConnections: 0, activeConnections: 0, peakConnections: 0, rejectedConnections: 0, closedConnections: 0, erroredConnections: 0, timedOutConnections: 0 }; SmtpLogger.debug('ConnectionManager destroyed'); } } //# 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