Source

Postfix Expired E-mails Logging Tweak / postfix / src / qmgr / qmgr_active.c

  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
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
/*++
/* NAME
/*	qmgr_active 3
/* SUMMARY
/*	active queue management
/* SYNOPSIS
/*	#include "qmgr.h"
/*
/*	void	qmgr_active_feed(scan_info, queue_id)
/*	QMGR_SCAN *scan_info;
/*	const char *queue_id;
/*
/*	void	qmgr_active_drain()
/*
/*	int	qmgr_active_done(message)
/*	QMGR_MESSAGE *message;
/* DESCRIPTION
/*	These functions maintain the active message queue: the set
/*	of messages that the queue manager is actually working on.
/*	The active queue is limited in size. Messages are drained
/*	from the active queue by allocating a delivery process and
/*	by delivering mail via that process.  Messages leak into the
/*	active queue only when the active queue is small enough.
/*	Damaged message files are saved to the "corrupt" directory.
/*
/*	qmgr_active_feed() inserts the named message file into
/*	the active queue. Message files with the wrong name or
/*	with other wrong properties are skipped but not removed.
/*	The following queue flags are recognized, other flags being
/*	ignored:
/* .IP QMGR_SCAN_ALL
/*	Examine all queue files. Normally, deferred queue files with
/*	future time stamps are ignored, and incoming queue files with
/*	future time stamps are frowned upon.
/* .PP
/*	qmgr_active_drain() allocates one delivery process.
/*	Process allocation is asynchronous. Once the delivery
/*	process is available, an attempt is made to deliver
/*	a message via it. Message delivery is asynchronous, too.
/*
/*	qmgr_active_done() deals with a message after delivery
/*	has been tried for all in-core recipients. If the message
/*	was bounced, a bounce message is sent to the sender, or
/*	to the Errors-To: address if one was specified.
/*	If there are more on-file recipients, a new batch of
/*	in-core recipients is read from the queue file. Otherwise,
/*	if a delivery agent marked the queue file as corrupt,
/*	the queue file is moved to the "corrupt" queue (surprise);
/*	if at least one delivery failed, the message is moved
/*	to the deferred queue. The time stamps of a deferred queue
/*	file are set to the nearest wakeup time of its recipient
/*	sites (if delivery failed due to a problem with a next-hop
/*	host), are set into the future by the amount of time the
/*	message was queued (per-message exponential backoff), or are set
/*	into the future by a minimal backoff time, whichever is more.
/*	The minimal_backoff_time parameter specifies the minimal
/*	amount of time between delivery attempts; maximal_backoff_time
/*	specifies an upper limit.
/* DIAGNOSTICS
/*	Fatal: queue file access failures, out of memory.
/*	Panic: interface violations, internal consistency errors.
/*	Warnings: corrupt message file. A corrupt message is saved
/*	to the "corrupt" queue for further inspection.
/* LICENSE
/* .ad
/* .fi
/*	The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*	Wietse Venema
/*	IBM T.J. Watson Research
/*	P.O. Box 704
/*	Yorktown Heights, NY 10598, USA
/*--*/

/* System library. */

#include <sys_defs.h>
#include <sys/stat.h>
#include <dirent.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <utime.h>
#include <errno.h>

#ifndef S_IRWXU				/* What? no POSIX system? */
#define S_IRWXU 0700
#endif

/* Utility library. */

#include <msg.h>
#include <events.h>
#include <mymalloc.h>
#include <vstream.h>
#include <warn_stat.h>

/* Global library. */

#include <mail_params.h>
#include <mail_open_ok.h>
#include <mail_queue.h>
#include <recipient_list.h>
#include <bounce.h>
#include <defer.h>
#include <trace.h>
#include <abounce.h>
#include <rec_type.h>
#include <qmgr_user.h>

/* Application-specific. */

#include "qmgr.h"

 /*
  * A bunch of call-back routines.
  */
static void qmgr_active_done_2_bounce_flush(int, char *);
static void qmgr_active_done_2_generic(QMGR_MESSAGE *);
static void qmgr_active_done_25_trace_flush(int, char *);
static void qmgr_active_done_25_generic(QMGR_MESSAGE *);
static void qmgr_active_done_3_defer_flush(int, char *);
static void qmgr_active_done_3_defer_warn(int, char *);
static void qmgr_active_done_3_generic(QMGR_MESSAGE *);

/* qmgr_active_corrupt - move corrupted file out of the way */

static void qmgr_active_corrupt(const char *queue_id)
{
    const char *myname = "qmgr_active_corrupt";

    if (mail_queue_rename(queue_id, MAIL_QUEUE_ACTIVE, MAIL_QUEUE_CORRUPT)) {
	if (errno != ENOENT)
	    msg_fatal("%s: save corrupt file queue %s id %s: %m",
		      myname, MAIL_QUEUE_ACTIVE, queue_id);
    } else {
	msg_warn("saving corrupt file \"%s\" from queue \"%s\" to queue \"%s\"",
		 queue_id, MAIL_QUEUE_ACTIVE, MAIL_QUEUE_CORRUPT);
    }
}

/* qmgr_active_defer - defer queue file */

static void qmgr_active_defer(const char *queue_name, const char *queue_id,
			              const char *dest_queue, int delay)
{
    const char *myname = "qmgr_active_defer";
    const char *path;
    struct utimbuf tbuf;

    if (msg_verbose)
	msg_info("wakeup %s after %ld secs", queue_id, (long) delay);

    tbuf.actime = tbuf.modtime = event_time() + delay;
    path = mail_queue_path((VSTRING *) 0, queue_name, queue_id);
    if (utime(path, &tbuf) < 0 && errno != ENOENT)
	msg_fatal("%s: update %s time stamps: %m", myname, path);
    if (mail_queue_rename(queue_id, queue_name, dest_queue)) {
	if (errno != ENOENT)
	    msg_fatal("%s: rename %s from %s to %s: %m", myname,
		      queue_id, queue_name, dest_queue);
	msg_warn("%s: rename %s from %s to %s: %m", myname,
		 queue_id, queue_name, dest_queue);
    } else if (msg_verbose) {
	msg_info("%s: defer %s", myname, queue_id);
    }
}

/* qmgr_active_feed - feed one message into active queue */

int     qmgr_active_feed(QMGR_SCAN *scan_info, const char *queue_id)
{
    const char *myname = "qmgr_active_feed";
    QMGR_MESSAGE *message;
    struct stat st;
    const char *path;

    if (strcmp(scan_info->queue, MAIL_QUEUE_ACTIVE) == 0)
	msg_panic("%s: bad queue %s", myname, scan_info->queue);
    if (msg_verbose)
	msg_info("%s: queue %s", myname, scan_info->queue);

    /*
     * Make sure this is something we are willing to open.
     */
    if (mail_open_ok(scan_info->queue, queue_id, &st, &path) == MAIL_OPEN_NO)
	return (0);

    if (msg_verbose)
	msg_info("%s: %s", myname, path);

    /*
     * Skip files that have time stamps into the future. They need to cool
     * down. Incoming and deferred files can have future time stamps.
     */
    if ((scan_info->flags & QMGR_SCAN_ALL) == 0
	&& st.st_mtime > time((time_t *) 0) + 1) {
	if (msg_verbose)
	    msg_info("%s: skip %s (%ld seconds)", myname, queue_id,
		     (long) (st.st_mtime - event_time()));
	return (0);
    }

    /*
     * Move the message to the active queue. File access errors are fatal.
     */
    if (mail_queue_rename(queue_id, scan_info->queue, MAIL_QUEUE_ACTIVE)) {
	if (errno != ENOENT)
	    msg_fatal("%s: %s: rename from %s to %s: %m", myname,
		      queue_id, scan_info->queue, MAIL_QUEUE_ACTIVE);
	msg_warn("%s: %s: rename from %s to %s: %m", myname,
		 queue_id, scan_info->queue, MAIL_QUEUE_ACTIVE);
	return (0);
    }

    /*
     * Extract envelope information: sender and recipients. At this point,
     * mail addresses have been processed by the cleanup service so they
     * should be in canonical form. Generate requests to deliver this
     * message.
     * 
     * Throwing away queue files seems bad, especially when they made it this
     * far into the mail system. Therefore we save bad files to a separate
     * directory for further inspection.
     * 
     * After queue manager restart it is possible that a queue file is still
     * being delivered. In that case (the file is locked), defer delivery by
     * a minimal amount of time.
     */
#define QMGR_FLUSH_AFTER	(QMGR_FLUSH_EACH | QMGR_FLUSH_DFXP)

    if ((message = qmgr_message_alloc(MAIL_QUEUE_ACTIVE, queue_id,
				 (st.st_mode & MAIL_QUEUE_STAT_UNTHROTTLE) ?
				      scan_info->flags | QMGR_FLUSH_AFTER :
				      scan_info->flags,
				 (st.st_mode & MAIL_QUEUE_STAT_UNTHROTTLE) ?
				  st.st_mode & ~MAIL_QUEUE_STAT_UNTHROTTLE :
				      0)) == 0) {
	qmgr_active_corrupt(queue_id);
	return (0);
    } else if (message == QMGR_MESSAGE_LOCKED) {
	qmgr_active_defer(MAIL_QUEUE_ACTIVE, queue_id, MAIL_QUEUE_INCOMING, 60);
	return (0);
    } else {

	/*
	 * Special case if all recipients were already delivered. Send any
	 * bounces and clean up.
	 */
	if (message->refcount == 0)
	    qmgr_active_done(message);
	return (1);
    }
}

/* qmgr_active_done - dispose of message after recipients have been tried */

void    qmgr_active_done(QMGR_MESSAGE *message)
{
    const char *myname = "qmgr_active_done";
    struct stat st;

    if (msg_verbose)
	msg_info("%s: %s", myname, message->queue_id);

    /*
     * During a previous iteration, an attempt to bounce this message may
     * have failed, so there may still be a bounce log lying around. XXX By
     * groping around in the bounce queue, we're trespassing on the bounce
     * service's territory. But doing so is more robust than depending on the
     * bounce daemon to do the lookup for us, and for us to do the deleting
     * after we have received a successful status from the bounce service.
     * The bounce queue directory blocks are most likely in memory anyway. If
     * these lookups become a performance problem we will have to build an
     * in-core cache into the bounce daemon.
     * 
     * Don't bounce when the bounce log is empty. The bounce process obviously
     * failed, and the delivery agent will have requested that the message be
     * deferred.
     * 
     * Bounces are sent asynchronously to avoid stalling while the cleanup
     * daemon waits for the qmgr to accept the "new mail" trigger.
     *
     * See also code in cleanup_bounce.c.
     */
    if (stat(mail_queue_path((VSTRING *) 0, MAIL_QUEUE_BOUNCE, message->queue_id), &st) == 0) {
	if (st.st_size == 0) {
	    if (mail_queue_remove(MAIL_QUEUE_BOUNCE, message->queue_id))
		msg_fatal("remove %s %s: %m",
			  MAIL_QUEUE_BOUNCE, message->queue_id);
	} else {
	    if (msg_verbose)
		msg_info("%s: bounce %s", myname, message->queue_id);
	    if (message->verp_delims == 0 || var_verp_bounce_off)
		abounce_flush(BOUNCE_FLAG_KEEP,
			      message->queue_name,
			      message->queue_id,
			      message->encoding,
			      message->sender,
			      message->dsn_envid,
			      message->dsn_ret,
			      qmgr_active_done_2_bounce_flush,
			      (char *) message);
	    else
		abounce_flush_verp(BOUNCE_FLAG_KEEP,
				   message->queue_name,
				   message->queue_id,
				   message->encoding,
				   message->sender,
				   message->dsn_envid,
				   message->dsn_ret,
				   message->verp_delims,
				   qmgr_active_done_2_bounce_flush,
				   (char *) message);
	    return;
	}
    }

    /*
     * Asynchronous processing does not reach this point.
     */
    qmgr_active_done_2_generic(message);
}

/* qmgr_active_done_2_bounce_flush - process abounce_flush() status */

static void qmgr_active_done_2_bounce_flush(int status, char *context)
{
    QMGR_MESSAGE *message = (QMGR_MESSAGE *) context;

    /*
     * Process abounce_flush() status and continue processing.
     */
    message->flags |= status;
    qmgr_active_done_2_generic(message);
}

/* qmgr_active_done_2_generic - continue processing */

static void qmgr_active_done_2_generic(QMGR_MESSAGE *message)
{
    const char *path;
    struct stat st;

    /*
     * A delivery agent marks a queue file as corrupt by changing its
     * attributes, and by pretending that delivery was deferred.
     */
    if (message->flags
	&& mail_open_ok(MAIL_QUEUE_ACTIVE, message->queue_id, &st, &path) == MAIL_OPEN_NO) {
	qmgr_active_corrupt(message->queue_id);
	qmgr_message_free(message);
	return;
    }

    /*
     * If we did not read all recipients from this file, go read some more,
     * but remember whether some recipients have to be tried again.
     * 
     * Throwing away queue files seems bad, especially when they made it this
     * far into the mail system. Therefore we save bad files to a separate
     * directory for further inspection by a human being.
     */
    if (message->rcpt_offset > 0) {
	if (qmgr_message_realloc(message) == 0) {
	    qmgr_active_corrupt(message->queue_id);
	    qmgr_message_free(message);
	} else {
	    if (message->refcount == 0)
		qmgr_active_done(message);	/* recurse for consistency */
	}
	return;
    }

    /*
     * XXX With multi-recipient mail, some recipients may have NOTIFY=SUCCESS
     * and others not. Depending on what subset of recipients are delivered,
     * a trace file may or may not be created. Even when the last partial
     * delivery attempt had no NOTIFY=SUCCESS recipients, a trace file may
     * still exist from a previous partial delivery attempt. So as long as
     * any recipient has NOTIFY=SUCCESS we have to always look for the trace
     * file and be prepared for the file not to exist.
     * 
     * See also comments in bounce/bounce_notify_util.c.
     */
    if ((message->tflags & (DEL_REQ_FLAG_USR_VRFY | DEL_REQ_FLAG_RECORD))
	|| (message->rflags & QMGR_READ_FLAG_NOTIFY_SUCCESS)) {
	atrace_flush(message->tflags,
		     message->queue_name,
		     message->queue_id,
		     message->encoding,
		     message->sender,
		     message->dsn_envid,
		     message->dsn_ret,
		     qmgr_active_done_25_trace_flush,
		     (char *) message);
	return;
    }

    /*
     * Asynchronous processing does not reach this point.
     */
    qmgr_active_done_25_generic(message);
}

/* qmgr_active_done_25_trace_flush - continue after atrace_flush() completion */

static void qmgr_active_done_25_trace_flush(int status, char *context)
{
    QMGR_MESSAGE *message = (QMGR_MESSAGE *) context;

    /*
     * Process atrace_flush() status and continue processing.
     */
    if (status == 0 && message->tflags_offset)
	qmgr_message_kill_record(message, message->tflags_offset);
    message->flags |= status;
    qmgr_active_done_25_generic(message);
}

/* qmgr_active_done_25_generic - continue processing */

static void qmgr_active_done_25_generic(QMGR_MESSAGE *message)
{
    const char *myname = "qmgr_active_done_25_generic";

    /*
     * If we get to this point we have tried all recipients for this message.
     * If the message is too old, try to bounce it.
     * 
     * Bounces are sent asynchronously to avoid stalling while the cleanup
     * daemon waits for the qmgr to accept the "new mail" trigger.
     */
    if (message->flags) {
	if (event_time() >= message->create_time +
	    (*message->sender ? var_max_queue_time : var_dsn_queue_time)) {
	    msg_info("%s: from=<%s>, status=expired, returned to sender",
		     message->queue_id, message->sender);
        {
            int i, len = message->rcpt_list.len;
            RECIPIENT * info = message->rcpt_list.info;
            /* Queue-id|Size|Sender|recipient|expired|bounced */
            for (i = 0 ; i < len ; i++) {
                msg_info("%s|%ld|%s|%s|%ld|%ld",
                    message->queue_id,
                    message->data_size,
                    message->sender,
                    info[i].address,
                    (long)event_time(),
                    0 /* TODO : Fill 'bounced' in */
                );
            }
        }
	    if (message->verp_delims == 0 || var_verp_bounce_off)
		adefer_flush(BOUNCE_FLAG_KEEP,
			     message->queue_name,
			     message->queue_id,
			     message->encoding,
			     message->sender,
			     message->dsn_envid,
			     message->dsn_ret,
			     qmgr_active_done_3_defer_flush,
			     (char *) message);
	    else
		adefer_flush_verp(BOUNCE_FLAG_KEEP,
				  message->queue_name,
				  message->queue_id,
				  message->encoding,
				  message->sender,
				  message->dsn_envid,
				  message->dsn_ret,
				  message->verp_delims,
				  qmgr_active_done_3_defer_flush,
				  (char *) message);
	    return;
	} else if (message->warn_time > 0
		   && event_time() >= message->warn_time - 1) {
	    if (msg_verbose)
		msg_info("%s: sending defer warning for %s", myname, message->queue_id);
	    adefer_warn(BOUNCE_FLAG_KEEP,
			message->queue_name,
			message->queue_id,
			message->encoding,
			message->sender,
			message->dsn_envid,
			message->dsn_ret,
			qmgr_active_done_3_defer_warn,
			(char *) message);
	    return;
	}
    }

    /*
     * Asynchronous processing does not reach this point.
     */
    qmgr_active_done_3_generic(message);
}

/* qmgr_active_done_3_defer_warn - continue after adefer_warn() completion */

static void qmgr_active_done_3_defer_warn(int status, char *context)
{
    QMGR_MESSAGE *message = (QMGR_MESSAGE *) context;

    /*
     * Process adefer_warn() completion status and continue processing.
     */
    if (status == 0)
	qmgr_message_update_warn(message);
    qmgr_active_done_3_generic(message);
}

/* qmgr_active_done_3_defer_flush - continue after adefer_flush() completion */

static void qmgr_active_done_3_defer_flush(int status, char *context)
{
    QMGR_MESSAGE *message = (QMGR_MESSAGE *) context;

    /*
     * Process adefer_flush() status and continue processing.
     */
    message->flags = status;
    qmgr_active_done_3_generic(message);
}

/* qmgr_active_done_3_generic - continue processing */

static void qmgr_active_done_3_generic(QMGR_MESSAGE *message)
{
    const char *myname = "qmgr_active_done_3_generic";
    int     delay;

    /*
     * Some recipients need to be tried again. Move the queue file time
     * stamps into the future by the amount of time that the message is
     * delayed, and move the message to the deferred queue. Impose minimal
     * and maximal backoff times.
     * 
     * Since we look at actual time in queue, not time since last delivery
     * attempt, backoff times will be distributed. However, we can still see
     * spikes in delivery activity because the interval between deferred
     * queue scans is finite.
     */
    if (message->flags) {
	if (message->create_time > 0) {
	    delay = event_time() - message->create_time;
	    if (delay > var_max_backoff_time)
		delay = var_max_backoff_time;
	    if (delay < var_min_backoff_time)
		delay = var_min_backoff_time;
	} else {
	    delay = var_min_backoff_time;
	}
	qmgr_active_defer(message->queue_name, message->queue_id,
			  MAIL_QUEUE_DEFERRED, delay);
    }

    /*
     * All recipients done. Remove the queue file.
     */
    else {
	if (mail_queue_remove(message->queue_name, message->queue_id)) {
	    if (errno != ENOENT)
		msg_fatal("%s: remove %s from %s: %m", myname,
			  message->queue_id, message->queue_name);
	    msg_warn("%s: remove %s from %s: %m", myname,
		     message->queue_id, message->queue_name);
	} else {
	    /* Same format as logged by postsuper. */
	    msg_info("%s: removed", message->queue_id);
	}
    }

    /*
     * Finally, delete the in-core message structure.
     */
    qmgr_message_free(message);
}

/* qmgr_active_drain - drain active queue by allocating a delivery process */

void    qmgr_active_drain(void)
{
    QMGR_TRANSPORT *transport;

    /*
     * Allocate one delivery process for every transport with pending mail.
     * The process allocation completes asynchronously.
     */
    while ((transport = qmgr_transport_select()) != 0) {
	if (msg_verbose)
	    msg_info("qmgr_active_drain: allocate %s", transport->name);
	qmgr_transport_alloc(transport, qmgr_deliver);
    }
}