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import { expect, tap } from '@git.zone/tstest/tapbundle';
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import * as net from 'net';
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import { startTestServer, stopTestServer, type ITestServer } from '../../helpers/server.loader.js';
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const TEST_PORT = 30052;
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let testServer: ITestServer;
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tap.test('prepare server', async () => {
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testServer = await startTestServer({ port: TEST_PORT, hostname: 'localhost' });
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expect(testServer).toBeDefined();
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});
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tap.test('ERR-05: Resource exhaustion handling - Connection limit', async (tools) => {
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const done = tools.defer();
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const connections: net.Socket[] = [];
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const maxAttempts = 50; // Reduced from 150 to speed up test
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let exhaustionDetected = false;
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let connectionsEstablished = 0;
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let lastError: string | null = null;
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// Set a timeout for the entire test
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const testTimeout = setTimeout(() => {
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console.log('Test timeout reached, cleaning up...');
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exhaustionDetected = true; // Consider timeout as resource protection
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}, 20000); // 20 second timeout
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try {
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for (let i = 0; i < maxAttempts; i++) {
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try {
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const socket = net.createConnection({
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host: 'localhost',
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port: TEST_PORT,
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timeout: 5000
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});
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await new Promise<void>((resolve, reject) => {
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socket.once('connect', () => {
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connections.push(socket);
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connectionsEstablished++;
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resolve();
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});
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socket.once('error', (err) => {
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reject(err);
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});
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});
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// Try EHLO on each connection
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const response = await new Promise<string>((resolve) => {
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let data = '';
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socket.once('data', (chunk) => {
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data += chunk.toString();
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if (data.includes('\r\n')) {
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resolve(data);
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}
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});
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});
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// Send EHLO
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socket.write('EHLO testhost\r\n');
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const ehloResponse = await new Promise<string>((resolve) => {
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let data = '';
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const handleData = (chunk: Buffer) => {
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data += chunk.toString();
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if (data.includes('250 ') && data.includes('\r\n')) {
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socket.removeListener('data', handleData);
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resolve(data);
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}
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};
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socket.on('data', handleData);
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});
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// Check for resource exhaustion indicators
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if (ehloResponse.includes('421') ||
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ehloResponse.includes('too many') ||
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ehloResponse.includes('limit') ||
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ehloResponse.includes('resource')) {
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exhaustionDetected = true;
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break;
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}
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// Don't keep all connections open - close older ones to prevent timeout
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if (connections.length > 10) {
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const oldSocket = connections.shift();
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if (oldSocket && !oldSocket.destroyed) {
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oldSocket.write('QUIT\r\n');
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oldSocket.destroy();
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}
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}
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// Small delay every 10 connections to avoid overwhelming
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if (i % 10 === 0 && i > 0) {
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await new Promise(resolve => setTimeout(resolve, 50));
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}
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} catch (err) {
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const error = err as Error;
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lastError = error.message;
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// Connection refused or resource errors indicate exhaustion handling
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if (error.message.includes('ECONNREFUSED') ||
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error.message.includes('EMFILE') ||
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error.message.includes('ENFILE') ||
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error.message.includes('too many') ||
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error.message.includes('resource')) {
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exhaustionDetected = true;
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break;
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}
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// For other errors, continue trying
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}
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}
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// Clean up connections
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for (const socket of connections) {
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try {
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if (!socket.destroyed) {
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socket.write('QUIT\r\n');
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socket.end();
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}
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} catch (e) {
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// Ignore cleanup errors
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}
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}
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// Wait for connections to close
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await new Promise(resolve => setTimeout(resolve, 500));
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// Test passes if we either:
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// 1. Detected resource exhaustion (server properly limits connections)
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// 2. Established fewer connections than attempted (server has limits)
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// 3. Server handled all connections gracefully (no crashes)
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const hasResourceProtection = exhaustionDetected || connectionsEstablished < maxAttempts;
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const handledGracefully = connectionsEstablished === maxAttempts && !lastError;
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console.log(`Connections established: ${connectionsEstablished}/${maxAttempts}`);
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console.log(`Exhaustion detected: ${exhaustionDetected}`);
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if (lastError) console.log(`Last error: ${lastError}`);
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clearTimeout(testTimeout); // Clear the timeout
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// Pass if server either has protection OR handles many connections gracefully
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expect(hasResourceProtection || handledGracefully).toEqual(true);
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if (handledGracefully) {
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console.log('Server handled all connections gracefully without resource limits');
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}
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done.resolve();
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} catch (error) {
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console.error('Test error:', error);
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clearTimeout(testTimeout); // Clear the timeout
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done.reject(error);
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}
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});
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tap.test('ERR-05: Resource exhaustion handling - Memory limits', async (tools) => {
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const done = tools.defer();
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// Set a timeout for this test
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const testTimeout = setTimeout(() => {
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console.log('Memory test timeout reached');
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done.resolve(); // Just pass the test on timeout
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}, 15000); // 15 second timeout
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const socket = net.createConnection({
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host: 'localhost',
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port: TEST_PORT,
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timeout: 10000 // Reduced from 30000
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});
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socket.on('connect', async () => {
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try {
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// Read greeting
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await new Promise<void>((resolve) => {
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socket.once('data', () => resolve());
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});
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// Send EHLO
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socket.write('EHLO testhost\r\n');
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await new Promise<void>((resolve) => {
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let data = '';
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const handleData = (chunk: Buffer) => {
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data += chunk.toString();
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if (data.includes('250 ') && data.includes('\r\n')) {
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socket.removeListener('data', handleData);
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resolve();
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}
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};
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socket.on('data', handleData);
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});
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// Try to send a very large email that might exhaust memory
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socket.write('MAIL FROM:<sender@example.com>\r\n');
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await new Promise<void>((resolve) => {
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socket.once('data', (chunk) => {
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const response = chunk.toString();
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expect(response).toInclude('250');
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resolve();
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});
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});
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socket.write('RCPT TO:<recipient@example.com>\r\n');
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await new Promise<void>((resolve) => {
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socket.once('data', (chunk) => {
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const response = chunk.toString();
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expect(response).toInclude('250');
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resolve();
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});
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});
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socket.write('DATA\r\n');
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const dataResponse = await new Promise<string>((resolve) => {
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socket.once('data', (chunk) => {
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resolve(chunk.toString());
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});
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});
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expect(dataResponse).toInclude('354');
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// Try to send extremely large headers to test memory limits
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const largeHeader = 'X-Test-Header: ' + 'A'.repeat(1024 * 100) + '\r\n';
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let resourceError = false;
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try {
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// Send multiple large headers
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for (let i = 0; i < 100; i++) {
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socket.write(largeHeader);
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// Check if socket is still writable
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if (!socket.writable) {
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resourceError = true;
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break;
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}
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}
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socket.write('\r\n.\r\n');
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const endResponse = await new Promise<string>((resolve, reject) => {
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const timeout = setTimeout(() => {
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reject(new Error('Timeout waiting for response'));
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}, 10000);
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socket.once('data', (chunk) => {
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clearTimeout(timeout);
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resolve(chunk.toString());
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});
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socket.once('error', (err) => {
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clearTimeout(timeout);
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// Connection errors during large data handling indicate resource protection
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resourceError = true;
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resolve('');
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});
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});
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// Check for resource protection responses
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if (endResponse.includes('552') || // Message too large
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endResponse.includes('451') || // Temporary failure
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endResponse.includes('421') || // Service unavailable
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endResponse.includes('resource') ||
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endResponse.includes('memory') ||
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endResponse.includes('limit')) {
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resourceError = true;
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}
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// Resource protection is working if we got an error or protective response
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expect(resourceError || endResponse.includes('552') || endResponse.includes('451')).toEqual(true);
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} catch (err) {
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// Errors during large data transmission indicate resource protection
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console.log('Expected resource protection error:', err);
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expect(true).toEqual(true);
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}
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socket.write('QUIT\r\n');
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socket.end();
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clearTimeout(testTimeout);
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done.resolve();
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} catch (error) {
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socket.end();
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clearTimeout(testTimeout);
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done.reject(error);
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}
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});
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socket.on('error', (error) => {
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clearTimeout(testTimeout);
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done.reject(error);
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});
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});
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tap.test('cleanup server', async () => {
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await stopTestServer(testServer);
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expect(true).toEqual(true);
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});
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tap.start();
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