forked from kennethkalmer/node-smtp
-
Notifications
You must be signed in to change notification settings - Fork 1
/
server.js
483 lines (395 loc) · 11.9 KB
/
server.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
/*
File: server.js
Author: Kenneth Kalmer, Philip Hofstetter
Description:
This file implements an SMTP server as defined in RFC2821.
Implements:
ESMTP: RFC2821
Issues:
Plenty, have patience.
*/
// Global
var net = require('net');
var sys = require('sys');
var Promise = require('../vendor/Promise');
// Local
var enable_debug = false;
var eol = "\r\n";
/*
RFC2821 defines an SMTP Session
*/
var SMTPSession = function(server) {
this.SMTPServer = server;
this.heloHost = null;
this.fromAddress = null;
this.recipients = [];
this.callbacks = [];
this.socket = null;
this.buffer = "";
this.data = null;
this.in_data = false;
this.esmtp = false;
};
sys.inherits( SMTPSession, process.EventEmitter );
SMTPSession.prototype.connect = function( socket ) {
var session = this;
this.socket = socket;
// callbacks first
socket.addListener( 'data', function(packet) {
session.receive( packet )
});
socket.addListener( 'end', function() {
// close on our end. If we don't, remotely closed connections will stay half
// open forever (in CLOSE_WAIT) or until we die of handle starvation or OOM
socket.end();
if ( this.listeners('end').length >= 0 ) {
session.emit( 'end', session );
}
delete(session);
});
// following two callbacks are not used at this time
// socket.addListener( 'eol', session.eol );
// socket.addListener( 'close', session.close );
if (enable_debug)
sys.puts('Connect listeners: ' + sys.inspect( this.listeners('connect') ) );
if ( this.listeners('connect').length <= 0 ) {
session.greeting();
} else {
var promise = new Promise.Promise();
promise.addCallback( function() {
session.greeting();
});
promise.addErrback( function( args ) {
var message = args[0], quit = args[1];
session.error( message );
if( quit ) session.quit();
});
this.emit( 'connect', socket.remoteAddress, promise, this );
}
};
// patterns for commands
SMTPSession.prototype.command_patterns = {
helo: /^HELO\s*/i,
ehlo: /^EHLO\s*/i,
quit: /^QUIT/i,
from: /^MAIL FROM:\s*/i,
rcpt: /^RCPT TO:\s*/i,
data: /^DATA/i,
noop: /^NOOP/i,
rset: /^RSET/i,
vrfy: /^VRFY\s+/i,
expn: /^EXPN\s+/,
help: /^HELP/i,
tls: /^STARTTLS/i,
auth: /^AUTH\s+/i
};
// Events emitted
SMTPSession.prototype.events = [
'connect',
'end',
'ehlo',
'helo',
'mail_from',
'rcpt_to',
'data',
'data_available',
'data_end'
];
// Replies
SMTPSession.prototype.send = function( s ) {
if( this.socket.readyState == 'open' ) {
if (enable_debug)
sys.print("SENDING: " + s + eol);
this.socket.write( s + eol );
}
};
SMTPSession.prototype.greeting = function() {
this.send("220 " + this.SMTPServer.hostname + " ESMTP node.js");
};
SMTPSession.prototype.notSupported = function(){
this.send( "500 not supported" );
};
SMTPSession.prototype.sendOk = function() {
this.send( "250 OK" );
};
SMTPSession.prototype.error = function( message, status ) {
var code = status || 500;
this.send( code + " " + message );
};
// Commands
SMTPSession.prototype.ehlo = function() {
var session = this;
var hostname = this.heloHost = this.extractArguments( 'EHLO' );
this.esmtp = true;
if (enable_debug)
sys.puts('EHLO listeners: ' + sys.inspect( this.listeners('ehlo') ) );
if ( this.listeners('ehlo').length <= 0 ) {
session.send('250-' + this.SMTPServer.hostname + ' Hello ' + this.socket.remoteAddress );
session.send('250 8BITMIME');
} else {
var promise = new Promise.Promise();
promise.addCallback( function(addcaps) {
var i = 0;
session.send('250-' + session.SMTPServer.hostname + ' Hello ' + session.socket.remoteAddress );
if (addcaps){
for(i = 0; i < addcaps.length; i++){
session.send('250-'+addcaps[i]);
}
}
session.send('250 8BITMIME');
});
promise.addErrback( function( message, quit ) {
session.error( message );
if( quit ) session.quit();
});
this.emit( 'ehlo', hostname, promise, this );
}
};
SMTPSession.prototype.helo = function() {
var session = this;
var hostname = this.heloHost = this.extractArguments( 'HELO' );
if (enable_debug)
sys.puts('HELO listeners: ' + sys.inspect( this.listeners('ehlo') ) );
if ( this.listeners('helo').length <= 0 ) {
session.send('250 ' + this.SMTPServer.hostname + ' Hello ' + this.socket.remoteAddress );
} else {
var promise = new Promise.Promise();
promise.addCallback( function() {
session.send('250 ' + session.SMTPServer.hostname + ' Hello ' + session.socket.remoteAddress );
});
promise.addErrback( function( message, quit ) {
session.error( message );
if( quit ) session.quit();
});
this.emit( 'helo', hostname, promise, this );
}
};
SMTPSession.prototype.receiver = function() {
var session = this;
if (this.fromAddress == null){
this.send("503 provide sender first");
return;
}
var addr = this.extractArguments( 'RCPT TO:' ).replace(/[<>]/g, '');
if (addr.match(/^[^@]+@[^@.][^@]+\.[^@.]+$/)){
if ( this.listeners('rcpt_to').length <= 0 ) {
this.recipients[session.recipients.length] = addr;
this.sendOk();
} else {
var promise = new Promise.Promise();
promise.addCallback( function(new_to) {
session.recipients[session.recipients.length] = new_to || addr;
session.sendOk();
});
promise.addErrback( function( args ) {
// quit is 1 everywhere, so keep that for consistencies sake
var message = args[0], quit = args[1], status = args[2];
status = status || 500;
session.error( message, status );
if( quit ) session.quit();
});
this.emit( 'rcpt_to', addr, promise, this );
}
}else{
this.error("keep address simpler. Please. We only support user@host.domain", 501);
}
};
SMTPSession.prototype.sender = function() {
var session = this;
if (this.heloHost == null){
this.send("503 we require greeting");
return;
}
var addr = this.extractArguments( 'MAIL FROM:' ).replace(/[<>]/g, '');
if ( this.listeners('mail_from').length <= 0 ) {
if (addr.match(/^[^@]+@[^@.][^@]+\.[^@.]+$/)){
session.fromAddress = addr;
this.sendOk();
}else{
this.error("keep address simpler. Please. We only support user@host.domain", 501);
}
} else {
var promise = new Promise.Promise();
promise.addCallback( function(new_from) {
session.fromAddress = new_from || addr;
session.sendOk();
});
promise.addErrback( function( args ) {
// quit is 1 everywhere, so keep that for consistencies sake
var message = args[0], quit = args[1], status = args[2];
status = status || 500;
session.error( message, status );
if( quit ) session.quit();
});
this.emit( 'mail_from', addr, promise, this, this.extractArguments('MAIL FROM:') );
}
};
SMTPSession.prototype.startData = function() {
var session = this;
var cont = function(){
session.in_data = true;
session.last_data_packet = undefined;
session.send("354 Terminate with line containing only '.'");
};
if (this.recipients.length == 0){
this.error("need recipient", 503);
return;
}
if ( this.listeners('data').length <= 0 ) {
cont();
} else {
var promise = new Promise.Promise();
promise.addCallback( function() {
cont();
});
promise.addErrback( function( args ) {
// quit is 1 everywhere, so keep that for consistencies sake
var message = args[0], quit = args[1], status = args[2];
status = status || 500;
session.error( message, status );
if( quit ) session.quit();
});
// keeping the interface intact even though we don't have anything
// protocol related to pass
this.emit( 'data', undefined, promise, this );
}
};
SMTPSession.prototype.quit = function() {
this.send( '221 ' + this.SMTPServer.hostname + ' closing connection' );
this.socket.end();
};
// Handlers
SMTPSession.prototype.receive = function( packet ) {
if (enable_debug)
sys.puts('Received data: ' + packet);
// if our client is using the streaming interface, we don't accumulate the
// data in our buffer, otherwise, the whole point is defeated :-)
if (!this.in_data || this.listeners('data_available').length == 0){
this.buffer += packet;
}
if ( this.in_data ) {
this.dataReceived(packet);
this.last_data_packet = packet;
} else if ( this.buffer.indexOf( eol ) != 1 ) {
var command = null;
for( var cmd in this.command_patterns ) {
if (this.command_patterns[ cmd ].test( this.buffer ) ) {
command = cmd;
break;
}
}
if (enable_debug)
sys.puts( 'Command: ' + sys.inspect(command) );
switch( cmd ) {
case 'ehlo':
this.ehlo();
break;
case 'helo':
this.helo();
break;
case 'rcpt':
this.receiver();
break;
case 'from':
this.sender();
break;
case 'data':
this.startData();
break;
case 'quit':
this.quit();
break;
default:
this.notSupported();
}
this.buffer = "";
}
};
SMTPSession.prototype.dataReceived = function(packet){
var session = this;
var re = new RegExp( eol + "\\." + eol );
// assembling last seen packet with current packet to check for
// crlf.crlf
var check = this.last_data_packet ? this.last_data_packet + packet : packet;
if( re.test( check ) ) {
if ( this.listeners('data_end').length <= 0 ) {
this.data = this.buffer.substr( 0, this.buffer.length - 5 ); // \r\n.\r\n
this.buffer = "";
this.in_data = false;
this.sendOk();
}else{
triggerEnd = function(data){
var p = new Promise.Promise();
p.addCallback( function() {
session.in_data = false;
session.buffer = "";
session.sendOk();
});
p.addErrback( function( args ) {
var message = args[0], quit = args[1], status = args[2];
status = status || 500;
session.error( message, status );
if( quit ) session.quit();
});
session.emit( 'data_end', data, p, session );
};
if (this.listeners('data_available').length > 0){
var s = "" + packet;
var pd = new Promise.Promise();
pd.addCallback(function(){
triggerEnd(s.substr(s.length - 5));
});
session.emit('data_available', s.substr(0, s.length - 5), pd, this);
}else{
triggerEnd(this.buffer.substr(0, this.buffer.length - 5))
}
}
}else{
if ( this.listeners('data_available').length > 0 ) {
var promise = new Promise.Promise();
promise.addErrback( function( args ) {
var message = args[0], quit = args[1], status = args[2];
status = status || 500;
session.error( message, status );
if( quit ) session.quit();
});
this.emit( 'data_available', packet, promise, this );
}
}
};
// Utilities
SMTPSession.prototype.extractArguments = function( command ) {
var re = new RegExp("^"+command, "i");
return this.buffer.replace( re, '' ).replace(/^\s\s*/, '').replace(/\s\s*$/, '');
};
/*
Server class
*/
var Server = exports.Server = function() {
process.EventEmitter.call( this );
this.host = 'localhost';
this.port = 10025;
this.callbacks = [];
this.server = null;
this.hostname = '<hostname>';
return this;
};
sys.inherits( Server, process.EventEmitter );
Server.prototype.runServer = function() {
var self = this;
this.server = net.createServer( function( socket ){
var session = new SMTPSession(self);
// Only add listeners to the session if folks are listening to us.
session.events.forEach( function( e ) {
if( self.listeners( e ).length > 0 ) {
var ev = e;
session.addListener( e, function() {
self.emit( ev, arguments );
});
}
});
session.connect( socket );
return session;
});
this.server.listen( this.port, this.host );
};