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Philipp Kunz
2025-05-24 17:00:59 +00:00
parent 4e4c7df558
commit 11a2ae6b27
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test/suite/smtpclient_edge-cases/test.cedge-03.protocol-violations.ts Normal file
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import { expect, tap } from '@git.zone/tstest/tapbundle';
import * as plugins from './plugins.js';
import { createTestServer } from '../../helpers/server.loader.js';
import { createSmtpClient } from '../../helpers/smtp.client.js';
tap.test('CEDGE-03: should handle protocol violations gracefully', async (tools) => {
const testId = 'CEDGE-03-protocol-violations';
console.log(`\n${testId}: Testing protocol violation handling...`);
let scenarioCount = 0;
// Scenario 1: Server closes connection unexpectedly
await (async () => {
scenarioCount++;
console.log(`\nScenario ${scenarioCount}: Testing unexpected connection closure`);
const testServer = await createTestServer({
onConnection: async (socket) => {
console.log(' [Server] Client connected');
socket.write('220 mail.example.com ESMTP\r\n');
let commandCount = 0;
socket.on('data', (data) => {
commandCount++;
const command = data.toString().trim();
console.log(` [Server] Received: ${command}`);
if (command.startsWith('EHLO')) {
socket.write('250-mail.example.com\r\n');
socket.write('250 OK\r\n');
} else if (command.startsWith('MAIL FROM:')) {
// Abruptly close connection
console.log(' [Server] Closing connection unexpectedly');
socket.destroy();
}
});
}
});
const smtpClient = createSmtpClient({
host: testServer.hostname,
port: testServer.port,
secure: false
});
const email = new plugins.smartmail.Email({
from: 'sender@example.com',
to: ['recipient@example.com'],
subject: 'Connection closure test',
text: 'Testing unexpected disconnection'
});
try {
await smtpClient.sendMail(email);
console.log(' Unexpected success');
} catch (error) {
console.log(` Expected error: ${error.message}`);
expect(error).toBeDefined();
}
await testServer.server.close();
})();
// Scenario 2: Server sends data without CRLF
await (async () => {
scenarioCount++;
console.log(`\nScenario ${scenarioCount}: Testing responses without proper CRLF`);
const testServer = await createTestServer({
onConnection: async (socket) => {
console.log(' [Server] Client connected');
// Send greeting without CRLF
socket.write('220 mail.example.com ESMTP');
// Then send proper CRLF
setTimeout(() => socket.write('\r\n'), 100);
socket.on('data', (data) => {
const command = data.toString().trim();
console.log(` [Server] Received: ${command}`);
if (command.startsWith('EHLO')) {
// Mix responses with and without CRLF
socket.write('250-mail.example.com\n'); // Just LF
socket.write('250-SIZE 10485760\r'); // Just CR
socket.write('250 OK\r\n'); // Proper CRLF
} else if (command.startsWith('MAIL FROM:')) {
socket.write('250 OK\r\n');
} else if (command.startsWith('RCPT TO:')) {
socket.write('250 OK\r\n');
} else if (command === 'DATA') {
socket.write('354 Start mail input\r\n');
} else if (command === '.') {
socket.write('250 OK\r\n');
} else if (command === 'QUIT') {
socket.write('221 Bye\r\n');
socket.end();
}
});
}
});
const smtpClient = createSmtpClient({
host: testServer.hostname,
port: testServer.port,
secure: false
});
const email = new plugins.smartmail.Email({
from: 'sender@example.com',
to: ['recipient@example.com'],
subject: 'Line ending test',
text: 'Testing non-standard line endings'
});
const result = await smtpClient.sendMail(email);
console.log(` Result: ${result.messageId ? 'Success (handled gracefully)' : 'Failed'}`);
expect(result).toBeDefined();
await testServer.server.close();
})();
// Scenario 3: Server sends responses in wrong order
await (async () => {
scenarioCount++;
console.log(`\nScenario ${scenarioCount}: Testing out-of-order responses`);
const testServer = await createTestServer({
onConnection: async (socket) => {
console.log(' [Server] Client connected');
socket.write('220 mail.example.com ESMTP\r\n');
const pendingResponses: Array<() => void> = [];
socket.on('data', (data) => {
const command = data.toString().trim();
console.log(` [Server] Received: ${command}`);
if (command.startsWith('EHLO')) {
socket.write('250-mail.example.com\r\n');
socket.write('250 OK\r\n');
} else if (command.startsWith('MAIL FROM:')) {
// Delay response
pendingResponses.push(() => {
socket.write('250 OK\r\n');
});
} else if (command.startsWith('RCPT TO:')) {
// Send this response first, then the MAIL response
socket.write('250 OK\r\n');
if (pendingResponses.length > 0) {
pendingResponses.forEach(fn => fn());
pendingResponses.length = 0;
}
} else if (command === 'DATA') {
socket.write('354 Start mail input\r\n');
} else if (command === '.') {
socket.write('250 OK\r\n');
} else if (command === 'QUIT') {
socket.write('221 Bye\r\n');
socket.end();
}
});
}
});
const smtpClient = createSmtpClient({
host: testServer.hostname,
port: testServer.port,
secure: false
});
const email = new plugins.smartmail.Email({
from: 'sender@example.com',
to: ['recipient@example.com'],
subject: 'Response order test',
text: 'Testing out-of-order responses'
});
try {
const result = await smtpClient.sendMail(email);
console.log(` Result: ${result.messageId ? 'Success' : 'Failed'}`);
} catch (error) {
console.log(` Expected possible error: ${error.message}`);
expect(error).toBeDefined();
}
await testServer.server.close();
})();
// Scenario 4: Server sends unsolicited responses
await (async () => {
scenarioCount++;
console.log(`\nScenario ${scenarioCount}: Testing unsolicited server responses`);
const testServer = await createTestServer({
onConnection: async (socket) => {
console.log(' [Server] Client connected');
socket.write('220 mail.example.com ESMTP\r\n');
// Send unsolicited responses periodically
const interval = setInterval(() => {
if (!socket.destroyed) {
console.log(' [Server] Sending unsolicited response');
socket.write('250-NOTICE: Server status update\r\n');
}
}, 500);
socket.on('close', () => clearInterval(interval));
socket.on('data', (data) => {
const command = data.toString().trim();
console.log(` [Server] Received: ${command}`);
if (command.startsWith('EHLO')) {
socket.write('250-mail.example.com\r\n');
socket.write('250 OK\r\n');
} else if (command.startsWith('MAIL FROM:')) {
socket.write('250 OK\r\n');
} else if (command.startsWith('RCPT TO:')) {
socket.write('250 OK\r\n');
} else if (command === 'DATA') {
socket.write('354 Start mail input\r\n');
} else if (command === '.') {
socket.write('250 OK\r\n');
} else if (command === 'QUIT') {
clearInterval(interval);
socket.write('221 Bye\r\n');
socket.end();
}
});
}
});
const smtpClient = createSmtpClient({
host: testServer.hostname,
port: testServer.port,
secure: false
});
const email = new plugins.smartmail.Email({
from: 'sender@example.com',
to: ['recipient@example.com'],
subject: 'Unsolicited response test',
text: 'Testing unsolicited server messages'
});
const result = await smtpClient.sendMail(email);
console.log(` Result: ${result.messageId ? 'Success' : 'Failed'}`);
expect(result).toBeDefined();
await testServer.server.close();
})();
// Scenario 5: Server violates response code format
await (async () => {
scenarioCount++;
console.log(`\nScenario ${scenarioCount}: Testing invalid response codes`);
const testServer = await createTestServer({
onConnection: async (socket) => {
console.log(' [Server] Client connected');
// Invalid response code (should be 3 digits)
socket.write('22 mail.example.com ESMTP\r\n');
setTimeout(() => {
// Send correct response
socket.write('220 mail.example.com ESMTP\r\n');
}, 100);
socket.on('data', (data) => {
const command = data.toString().trim();
console.log(` [Server] Received: ${command}`);
if (command.startsWith('EHLO')) {
// Mix valid and invalid response codes
socket.write('250-mail.example.com\r\n');
socket.write('25O-TYPO IN CODE\r\n'); // Letter O instead of zero
socket.write('250 OK\r\n');
} else if (command.startsWith('MAIL FROM:')) {
socket.write('2.5.0 OK\r\n'); // Wrong format
setTimeout(() => {
socket.write('250 OK\r\n');
}, 50);
} else if (command.startsWith('RCPT TO:')) {
socket.write('250 OK\r\n');
} else if (command === 'DATA') {
socket.write('354 Start mail input\r\n');
} else if (command === '.') {
socket.write('250 OK\r\n');
} else if (command === 'QUIT') {
socket.write('221 Bye\r\n');
socket.end();
}
});
}
});
const smtpClient = createSmtpClient({
host: testServer.hostname,
port: testServer.port,
secure: false
});
const email = new plugins.smartmail.Email({
from: 'sender@example.com',
to: ['recipient@example.com'],
subject: 'Response code test',
text: 'Testing invalid response codes'
});
try {
const result = await smtpClient.sendMail(email);
console.log(` Result: ${result.messageId ? 'Success (handled invalid codes)' : 'Failed'}`);
} catch (error) {
console.log(` Expected possible error: ${error.message}`);
expect(error).toBeDefined();
}
await testServer.server.close();
})();
// Scenario 6: Server sends binary data
await (async () => {
scenarioCount++;
console.log(`\nScenario ${scenarioCount}: Testing binary data in responses`);
const testServer = await createTestServer({
onConnection: async (socket) => {
console.log(' [Server] Client connected');
// Send greeting with some binary data
socket.write('220 mail.example.com ESMTP\r\n');
socket.write(Buffer.from([0x00, 0x01, 0x02, 0x03])); // Binary data
socket.on('data', (data) => {
const command = data.toString().trim();
console.log(` [Server] Received: ${command}`);
if (command.startsWith('EHLO')) {
socket.write('250-mail.example.com\r\n');
socket.write('250 OK\r\n');
} else if (command.startsWith('MAIL FROM:')) {
socket.write('250 OK\r\n');
} else if (command.startsWith('RCPT TO:')) {
socket.write('250 OK\r\n');
} else if (command === 'DATA') {
socket.write('354 Start mail input\r\n');
} else if (command === '.') {
// Include binary in response
socket.write('250 OK ');
socket.write(Buffer.from([0xFF, 0xFE]));
socket.write('\r\n');
} else if (command === 'QUIT') {
socket.write('221 Bye\r\n');
socket.end();
}
});
}
});
const smtpClient = createSmtpClient({
host: testServer.hostname,
port: testServer.port,
secure: false
});
const email = new plugins.smartmail.Email({
from: 'sender@example.com',
to: ['recipient@example.com'],
subject: 'Binary data test',
text: 'Testing binary data handling'
});
try {
const result = await smtpClient.sendMail(email);
console.log(` Result: ${result.messageId ? 'Success' : 'Failed'}`);
expect(result).toBeDefined();
} catch (error) {
console.log(` Error handling binary data: ${error.message}`);
expect(error).toBeDefined();
}
await testServer.server.close();
})();
console.log(`\n${testId}: All ${scenarioCount} protocol violation scenarios tested ✓`);
});