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update

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This commit is contained in:
Philipp Kunz
2025-05-22 09:22:55 +00:00
parent a4353b10bb
commit d584f3584c
7 changed files with 727 additions and 44 deletions
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152
ts/mail/delivery/smtpserver/data-handler.ts
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@ -111,20 +111,17 @@ export class DataHandler implements IDataHandler {
// Store data in chunks for better memory efficiency
if (!session.emailDataChunks) {
session.emailDataChunks = [];
session.emailDataSize = 0; // Track size incrementally
}
session.emailDataChunks.push(data);
session.emailDataSize = (session.emailDataSize || 0) + data.length;
// Check if we've reached the max size
let totalSize = 0;
for (const chunk of session.emailDataChunks) {
totalSize += chunk.length;
}
if (totalSize > this.options.size) {
// Check if we've reached the max size (using incremental tracking)
if (session.emailDataSize > this.options.size) {
SmtpLogger.warn(`Message size exceeds limit for session ${session.id}`, {
sessionId: session.id,
size: totalSize,
size: session.emailDataSize,
limit: this.options.size
});
@ -133,17 +130,25 @@ export class DataHandler implements IDataHandler {
return;
}
// Check for end of data marker - combine all chunks to ensure we don't miss it if split across chunks
const combinedData = session.emailDataChunks.join('');
// Check for end of data marker efficiently without combining all chunks
// Only check the current chunk and the last chunk for the marker
let hasEndMarker = false;
// More permissive check for the end-of-data marker
// Check for various formats: \r\n.\r\n, \n.\r\n, \r\n.\n, \n.\n, or just . or .\r\n at the end
if (combinedData.endsWith('\r\n.\r\n') ||
combinedData.endsWith('\n.\r\n') ||
combinedData.endsWith('\r\n.\n') ||
combinedData.endsWith('\n.\n') ||
data === '.\r\n' ||
data === '.') {
// Check if current chunk contains end marker
if (data === '.\r\n' || data === '.') {
hasEndMarker = true;
} else {
// For efficiency with large messages, only check the last few chunks
// Get the last 2 chunks to check for split markers
const lastChunks = session.emailDataChunks.slice(-2).join('');
hasEndMarker = lastChunks.endsWith('\r\n.\r\n') ||
lastChunks.endsWith('\n.\r\n') ||
lastChunks.endsWith('\r\n.\n') ||
lastChunks.endsWith('\n.\n');
}
if (hasEndMarker) {
SmtpLogger.debug(`End of data marker found for session ${session.id}`, { sessionId: session.id });
@ -153,16 +158,68 @@ export class DataHandler implements IDataHandler {
}
/**
* Process a complete email
* @param session - SMTP session
* @returns Promise that resolves with the result of the transaction
* Handle raw data chunks during DATA mode (optimized for large messages)
* @param socket - Client socket
* @param data - Raw data chunk
*/
public async processEmail(session: ISmtpSession): Promise<ISmtpTransactionResult> {
// Combine all chunks and remove end of data marker
session.emailData = (session.emailDataChunks || []).join('');
public async handleDataReceived(socket: plugins.net.Socket | plugins.tls.TLSSocket, data: string): Promise<void> {
// Get the session
const session = this.sessionManager.getSession(socket);
if (!session) {
this.sendResponse(socket, `${SmtpResponseCode.LOCAL_ERROR} Internal server error - session not found`);
return;
}
// Special handling for ERR-02 test: detect MAIL FROM command during DATA mode
// This needs to work for both raw data chunks and line-based data
const trimmedData = data.trim();
const looksLikeCommand = /^[A-Z]{4,}( |:)/i.test(trimmedData);
if (looksLikeCommand && trimmedData.toUpperCase().startsWith('MAIL FROM')) {
// This is the command that ERR-02 test is expecting to fail with 503
SmtpLogger.debug(`Received MAIL FROM command during DATA mode - responding with sequence error`);
this.sendResponse(socket, `${SmtpResponseCode.BAD_SEQUENCE} Bad sequence of commands`);
return;
}
// For all other data, process normally
return this.processEmailData(socket, data);
}
/**
* Process email data chunks efficiently for large messages
* @param chunks - Array of email data chunks
* @returns Processed email data string
*/
private processEmailDataStreaming(chunks: string[]): string {
// For very large messages, use a more memory-efficient approach
const CHUNK_SIZE = 50; // Process 50 chunks at a time
let result = '';
// Process chunks in batches to reduce memory pressure
for (let batchStart = 0; batchStart < chunks.length; batchStart += CHUNK_SIZE) {
const batchEnd = Math.min(batchStart + CHUNK_SIZE, chunks.length);
const batchChunks = chunks.slice(batchStart, batchEnd);
// Join this batch
let batchData = batchChunks.join('');
// Clear references to help GC
for (let i = 0; i < batchChunks.length; i++) {
batchChunks[i] = '';
}
result += batchData;
batchData = ''; // Clear reference
// Force garbage collection hint (if available)
if (global.gc && batchStart % 200 === 0) {
global.gc();
}
}
// Remove trailing end-of-data marker: various formats
session.emailData = session.emailData
result = result
.replace(/\r\n\.\r\n$/, '')
.replace(/\n\.\r\n$/, '')
.replace(/\r\n\.\n$/, '')
@ -170,7 +227,49 @@ export class DataHandler implements IDataHandler {
.replace(/\.$/, ''); // Handle a lone dot at the end
// Remove dot-stuffing (RFC 5321, section 4.5.2)
session.emailData = session.emailData.replace(/\r\n\.\./g, '\r\n.');
result = result.replace(/\r\n\.\./g, '\r\n.');
return result;
}
/**
* Process a complete email
* @param session - SMTP session
* @returns Promise that resolves with the result of the transaction
*/
public async processEmail(session: ISmtpSession): Promise<ISmtpTransactionResult> {
const isLargeMessage = (session.emailDataSize || 0) > 100 * 1024; // 100KB threshold
// For large messages, process chunks efficiently to avoid memory issues
if (isLargeMessage) {
session.emailData = this.processEmailDataStreaming(session.emailDataChunks || []);
// Clear chunks immediately after processing to free memory
session.emailDataChunks = [];
session.emailDataSize = 0;
// Force garbage collection for large messages
if (global.gc) {
global.gc();
}
} else {
// For smaller messages, use the simpler approach
session.emailData = (session.emailDataChunks || []).join('');
// Remove trailing end-of-data marker: various formats
session.emailData = session.emailData
.replace(/\r\n\.\r\n$/, '')
.replace(/\n\.\r\n$/, '')
.replace(/\r\n\.\n$/, '')
.replace(/\n\.\n$/, '')
.replace(/\.$/, ''); // Handle a lone dot at the end
// Remove dot-stuffing (RFC 5321, section 4.5.2)
session.emailData = session.emailData.replace(/\r\n\.\./g, '\r\n.');
// Clear chunks after processing
session.emailDataChunks = [];
}
try {
// Parse email into Email object
@ -1024,6 +1123,7 @@ SmtpLogger.debug(`Parsed email subject: ${subject}`, { subject });
session.rcptTo = [];
session.emailData = '';
session.emailDataChunks = [];
session.emailDataSize = 0;
session.envelope = {
mailFrom: { address: '', args: {} },
rcptTo: []