xref: /illumos-gate/usr/src/cmd/sendmail/src/savemail.c (revision 48bbca816818409505a6e214d0911fda44e622e3)
1 /*
2  * Copyright (c) 1998-2003, 2006 Sendmail, Inc. and its suppliers.
3  *	All rights reserved.
4  * Copyright (c) 1983, 1995-1997 Eric P. Allman.  All rights reserved.
5  * Copyright (c) 1988, 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * By using this file, you agree to the terms and conditions set
9  * forth in the LICENSE file which can be found at the top level of
10  * the sendmail distribution.
11  *
12  */
13 /*
14  * Copyright (c) 2016 by Delphix. All rights reserved.
15  */
16 #include <sendmail.h>
17 
18 SM_RCSID("@(#)$Id: savemail.c,v 8.314 2009/12/18 17:08:01 ca Exp $")
19 
20 static bool	errbody __P((MCI *, ENVELOPE *, char *));
21 static bool	pruneroute __P((char *));
22 
23 /*
24 **  SAVEMAIL -- Save mail on error
25 **
26 **	If mailing back errors, mail it back to the originator
27 **	together with an error message; otherwise, just put it in
28 **	dead.letter in the user's home directory (if they exist on
29 **	this machine).
30 **
31 **	Parameters:
32 **		e -- the envelope containing the message in error.
33 **		sendbody -- if true, also send back the body of the
34 **			message; otherwise just send the header.
35 **
36 **	Returns:
37 **		true if savemail panic'ed, (i.e., the data file should
38 **		be preserved by dropenvelope())
39 **
40 **	Side Effects:
41 **		Saves the letter, by writing or mailing it back to the
42 **		sender, or by putting it in dead.letter in their home
43 **		directory.
44 */
45 
46 /* defines for state machine */
47 #define ESM_REPORT		0	/* report to sender's terminal */
48 #define ESM_MAIL		1	/* mail back to sender */
49 #define ESM_QUIET		2	/* mail has already been returned */
50 #define ESM_DEADLETTER		3	/* save in ~/dead.letter */
51 #define ESM_POSTMASTER		4	/* return to postmaster */
52 #define ESM_DEADLETTERDROP	5	/* save in DeadLetterDrop */
53 #define ESM_PANIC		6	/* call loseqfile() */
54 #define ESM_DONE		7	/* message is successfully delivered */
55 
56 bool
savemail(e,sendbody)57 savemail(e, sendbody)
58 	register ENVELOPE *e;
59 	bool sendbody;
60 {
61 	register SM_FILE_T *fp;
62 	bool panic = false;
63 	int state;
64 	auto ADDRESS *q = NULL;
65 	register char *p;
66 	MCI mcibuf;
67 	int flags;
68 	long sff;
69 	char buf[MAXLINE + 1];
70 	char dlbuf[MAXPATHLEN];
71 	SM_MBDB_T user;
72 
73 
74 	if (tTd(6, 1))
75 	{
76 		sm_dprintf("\nsavemail, errormode = %c, id = %s, ExitStat = %d\n  e_from=",
77 			e->e_errormode, e->e_id == NULL ? "NONE" : e->e_id,
78 			ExitStat);
79 		printaddr(sm_debug_file(), &e->e_from, false);
80 	}
81 
82 	if (e->e_id == NULL)
83 	{
84 		/* can't return a message with no id */
85 		return panic;
86 	}
87 
88 	/*
89 	**  In the unhappy event we don't know who to return the mail
90 	**  to, make someone up.
91 	*/
92 
93 	if (e->e_from.q_paddr == NULL)
94 	{
95 		e->e_sender = "Postmaster";
96 		if (parseaddr(e->e_sender, &e->e_from,
97 			      RF_COPYPARSE|RF_SENDERADDR,
98 			      '\0', NULL, e, false) == NULL)
99 		{
100 			syserr("553 5.3.5 Cannot parse Postmaster!");
101 			finis(true, true, EX_SOFTWARE);
102 		}
103 	}
104 	e->e_to = NULL;
105 
106 	/*
107 	**  Basic state machine.
108 	**
109 	**	This machine runs through the following states:
110 	**
111 	**	ESM_QUIET	Errors have already been printed iff the
112 	**			sender is local.
113 	**	ESM_REPORT	Report directly to the sender's terminal.
114 	**	ESM_MAIL	Mail response to the sender.
115 	**	ESM_DEADLETTER	Save response in ~/dead.letter.
116 	**	ESM_POSTMASTER	Mail response to the postmaster.
117 	**	ESM_DEADLETTERDROP
118 	**			If DeadLetterDrop set, save it there.
119 	**	ESM_PANIC	Save response anywhere possible.
120 	*/
121 
122 	/* determine starting state */
123 	switch (e->e_errormode)
124 	{
125 	  case EM_WRITE:
126 		state = ESM_REPORT;
127 		break;
128 
129 	  case EM_BERKNET:
130 	  case EM_MAIL:
131 		state = ESM_MAIL;
132 		break;
133 
134 	  case EM_PRINT:
135 	  case '\0':
136 		state = ESM_QUIET;
137 		break;
138 
139 	  case EM_QUIET:
140 		/* no need to return anything at all */
141 		return panic;
142 
143 	  default:
144 		syserr("554 5.3.0 savemail: bogus errormode x%x",
145 		       e->e_errormode);
146 		state = ESM_MAIL;
147 		break;
148 	}
149 
150 	/* if this is already an error response, send to postmaster */
151 	if (bitset(EF_RESPONSE, e->e_flags))
152 	{
153 		if (e->e_parent != NULL &&
154 		    bitset(EF_RESPONSE, e->e_parent->e_flags))
155 		{
156 			/* got an error sending a response -- can it */
157 			return panic;
158 		}
159 		state = ESM_POSTMASTER;
160 	}
161 
162 	while (state != ESM_DONE)
163 	{
164 		if (tTd(6, 5))
165 			sm_dprintf("  state %d\n", state);
166 
167 		switch (state)
168 		{
169 		  case ESM_QUIET:
170 			if (bitnset(M_LOCALMAILER, e->e_from.q_mailer->m_flags))
171 				state = ESM_DEADLETTER;
172 			else
173 				state = ESM_MAIL;
174 			break;
175 
176 		  case ESM_REPORT:
177 
178 			/*
179 			**  If the user is still logged in on the same terminal,
180 			**  then write the error messages back to hir (sic).
181 			*/
182 
183 #if USE_TTYPATH
184 			p = ttypath();
185 #else /* USE_TTYPATH */
186 			p = NULL;
187 #endif /* USE_TTYPATH */
188 
189 			if (p == NULL || sm_io_reopen(SmFtStdio,
190 						      SM_TIME_DEFAULT,
191 						      p, SM_IO_WRONLY, NULL,
192 						      smioout) == NULL)
193 			{
194 				state = ESM_MAIL;
195 				break;
196 			}
197 
198 			expand("\201n", buf, sizeof(buf), e);
199 			(void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
200 					     "\r\nMessage from %s...\r\n", buf);
201 			(void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
202 					     "Errors occurred while sending mail.\r\n");
203 			if (e->e_xfp != NULL)
204 			{
205 				(void) bfrewind(e->e_xfp);
206 				(void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
207 						     "Transcript follows:\r\n");
208 				while (sm_io_fgets(e->e_xfp, SM_TIME_DEFAULT,
209 						   buf, sizeof(buf)) != NULL &&
210 				       !sm_io_error(smioout))
211 					(void) sm_io_fputs(smioout,
212 							   SM_TIME_DEFAULT,
213 							   buf);
214 			}
215 			else
216 			{
217 				syserr("Cannot open %s",
218 				       queuename(e, XSCRPT_LETTER));
219 				(void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
220 						     "Transcript of session is unavailable.\r\n");
221 			}
222 			(void) sm_io_fprintf(smioout, SM_TIME_DEFAULT,
223 					     "Original message will be saved in dead.letter.\r\n");
224 			state = ESM_DEADLETTER;
225 			break;
226 
227 		  case ESM_MAIL:
228 			/*
229 			**  If mailing back, do it.
230 			**	Throw away all further output.  Don't alias,
231 			**	since this could cause loops, e.g., if joe
232 			**	mails to joe@x, and for some reason the network
233 			**	for @x is down, then the response gets sent to
234 			**	joe@x, which gives a response, etc.  Also force
235 			**	the mail to be delivered even if a version of
236 			**	it has already been sent to the sender.
237 			**
238 			**  If this is a configuration or local software
239 			**	error, send to the local postmaster as well,
240 			**	since the originator can't do anything
241 			**	about it anyway.  Note that this is a full
242 			**	copy of the message (intentionally) so that
243 			**	the Postmaster can forward things along.
244 			*/
245 
246 			if (ExitStat == EX_CONFIG || ExitStat == EX_SOFTWARE)
247 			{
248 				(void) sendtolist("postmaster", NULLADDR,
249 						  &e->e_errorqueue, 0, e);
250 			}
251 			if (!emptyaddr(&e->e_from))
252 			{
253 				char from[TOBUFSIZE];
254 
255 				if (sm_strlcpy(from, e->e_from.q_paddr,
256 						sizeof(from)) >= sizeof(from))
257 				{
258 					state = ESM_POSTMASTER;
259 					break;
260 				}
261 
262 				if (!DontPruneRoutes)
263 					(void) pruneroute(from);
264 
265 				(void) sendtolist(from, NULLADDR,
266 						  &e->e_errorqueue, 0, e);
267 			}
268 
269 			/*
270 			**  Deliver a non-delivery report to the
271 			**  Postmaster-designate (not necessarily
272 			**  Postmaster).  This does not include the
273 			**  body of the message, for privacy reasons.
274 			**  You really shouldn't need this.
275 			*/
276 
277 			e->e_flags |= EF_PM_NOTIFY;
278 
279 			/* check to see if there are any good addresses */
280 			for (q = e->e_errorqueue; q != NULL; q = q->q_next)
281 			{
282 				if (QS_IS_SENDABLE(q->q_state))
283 					break;
284 			}
285 			if (q == NULL)
286 			{
287 				/* this is an error-error */
288 				state = ESM_POSTMASTER;
289 				break;
290 			}
291 			if (returntosender(e->e_message, e->e_errorqueue,
292 					   sendbody ? RTSF_SEND_BODY
293 						    : RTSF_NO_BODY,
294 					   e) == 0)
295 			{
296 				state = ESM_DONE;
297 				break;
298 			}
299 
300 			/* didn't work -- return to postmaster */
301 			state = ESM_POSTMASTER;
302 			break;
303 
304 		  case ESM_POSTMASTER:
305 			/*
306 			**  Similar to previous case, but to system postmaster.
307 			*/
308 
309 			q = NULL;
310 			expand(DoubleBounceAddr, buf, sizeof(buf), e);
311 
312 			/*
313 			**  Just drop it on the floor if DoubleBounceAddr
314 			**  expands to an empty string.
315 			*/
316 
317 			if (*buf == '\0')
318 			{
319 				state = ESM_DONE;
320 				break;
321 			}
322 			if (sendtolist(buf, NULLADDR, &q, 0, e) <= 0)
323 			{
324 				syserr("553 5.3.0 cannot parse %s!", buf);
325 				ExitStat = EX_SOFTWARE;
326 				state = ESM_DEADLETTERDROP;
327 				break;
328 			}
329 			flags = RTSF_PM_BOUNCE;
330 			if (sendbody)
331 				flags |= RTSF_SEND_BODY;
332 			if (returntosender(e->e_message, q, flags, e) == 0)
333 			{
334 				state = ESM_DONE;
335 				break;
336 			}
337 
338 			/* didn't work -- last resort */
339 			state = ESM_DEADLETTERDROP;
340 			break;
341 
342 		  case ESM_DEADLETTER:
343 			/*
344 			**  Save the message in dead.letter.
345 			**	If we weren't mailing back, and the user is
346 			**	local, we should save the message in
347 			**	~/dead.letter so that the poor person doesn't
348 			**	have to type it over again -- and we all know
349 			**	what poor typists UNIX users are.
350 			*/
351 
352 			p = NULL;
353 			if (bitnset(M_HASPWENT, e->e_from.q_mailer->m_flags))
354 			{
355 				if (e->e_from.q_home != NULL)
356 					p = e->e_from.q_home;
357 				else if (sm_mbdb_lookup(e->e_from.q_user, &user)
358 					 == EX_OK &&
359 					 *user.mbdb_homedir != '\0')
360 					p = user.mbdb_homedir;
361 			}
362 			if (p == NULL || e->e_dfp == NULL)
363 			{
364 				/* no local directory or no data file */
365 				state = ESM_MAIL;
366 				break;
367 			}
368 
369 			/* we have a home directory; write dead.letter */
370 			macdefine(&e->e_macro, A_TEMP, 'z', p);
371 
372 			/* get the sender for the UnixFromLine */
373 			p = macvalue('g', e);
374 			macdefine(&e->e_macro, A_PERM, 'g', e->e_sender);
375 
376 			expand("\201z/dead.letter", dlbuf, sizeof(dlbuf), e);
377 			sff = SFF_CREAT|SFF_REGONLY|SFF_RUNASREALUID;
378 			if (RealUid == 0)
379 				sff |= SFF_ROOTOK;
380 			e->e_to = dlbuf;
381 			if (writable(dlbuf, NULL, sff) &&
382 			    mailfile(dlbuf, FileMailer, NULL, sff, e) == EX_OK)
383 			{
384 				int oldverb = Verbose;
385 
386 				if (OpMode != MD_DAEMON && OpMode != MD_SMTP)
387 					Verbose = 1;
388 				if (Verbose > 0)
389 					message("Saved message in %s", dlbuf);
390 				Verbose = oldverb;
391 				macdefine(&e->e_macro, A_PERM, 'g', p);
392 				state = ESM_DONE;
393 				break;
394 			}
395 			macdefine(&e->e_macro, A_PERM, 'g', p);
396 			state = ESM_MAIL;
397 			break;
398 
399 		  case ESM_DEADLETTERDROP:
400 			/*
401 			**  Log the mail in DeadLetterDrop file.
402 			*/
403 
404 			if (e->e_class < 0)
405 			{
406 				state = ESM_DONE;
407 				break;
408 			}
409 
410 			if ((SafeFileEnv != NULL && SafeFileEnv[0] != '\0') ||
411 			    DeadLetterDrop == NULL ||
412 			    DeadLetterDrop[0] == '\0')
413 			{
414 				state = ESM_PANIC;
415 				break;
416 			}
417 
418 			sff = SFF_CREAT|SFF_REGONLY|SFF_ROOTOK|SFF_OPENASROOT|SFF_MUSTOWN;
419 			if (!writable(DeadLetterDrop, NULL, sff) ||
420 			    (fp = safefopen(DeadLetterDrop, O_WRONLY|O_APPEND,
421 					    FileMode, sff)) == NULL)
422 			{
423 				state = ESM_PANIC;
424 				break;
425 			}
426 
427 			memset(&mcibuf, '\0', sizeof(mcibuf));
428 			mcibuf.mci_out = fp;
429 			mcibuf.mci_mailer = FileMailer;
430 			if (bitnset(M_7BITS, FileMailer->m_flags))
431 				mcibuf.mci_flags |= MCIF_7BIT;
432 
433 			/* get the sender for the UnixFromLine */
434 			p = macvalue('g', e);
435 			macdefine(&e->e_macro, A_PERM, 'g', e->e_sender);
436 
437 			if (!putfromline(&mcibuf, e) ||
438 			    !(*e->e_puthdr)(&mcibuf, e->e_header, e,
439 					M87F_OUTER) ||
440 			    !(*e->e_putbody)(&mcibuf, e, NULL) ||
441 			    !putline("\n", &mcibuf) ||
442 			    sm_io_flush(fp, SM_TIME_DEFAULT) == SM_IO_EOF ||
443 			    sm_io_error(fp) ||
444 			    sm_io_close(fp, SM_TIME_DEFAULT) < 0)
445 				state = ESM_PANIC;
446 			else
447 			{
448 				int oldverb = Verbose;
449 
450 				if (OpMode != MD_DAEMON && OpMode != MD_SMTP)
451 					Verbose = 1;
452 				if (Verbose > 0)
453 					message("Saved message in %s",
454 						DeadLetterDrop);
455 				Verbose = oldverb;
456 				if (LogLevel > 3)
457 					sm_syslog(LOG_NOTICE, e->e_id,
458 						  "Saved message in %s",
459 						  DeadLetterDrop);
460 				state = ESM_DONE;
461 			}
462 			macdefine(&e->e_macro, A_PERM, 'g', p);
463 			break;
464 
465 		  default:
466 			syserr("554 5.3.5 savemail: unknown state %d", state);
467 			/* FALLTHROUGH */
468 
469 		  case ESM_PANIC:
470 			/* leave the locked queue & transcript files around */
471 			loseqfile(e, "savemail panic");
472 			panic = true;
473 			errno = 0;
474 			syserr("554 savemail: cannot save rejected email anywhere");
475 			state = ESM_DONE;
476 			break;
477 		}
478 	}
479 	return panic;
480 }
481 /*
482 **  RETURNTOSENDER -- return a message to the sender with an error.
483 **
484 **	Parameters:
485 **		msg -- the explanatory message.
486 **		returnq -- the queue of people to send the message to.
487 **		flags -- flags tweaking the operation:
488 **			RTSF_SENDBODY -- include body of message (otherwise
489 **				just send the header).
490 **			RTSF_PMBOUNCE -- this is a postmaster bounce.
491 **		e -- the current envelope.
492 **
493 **	Returns:
494 **		zero -- if everything went ok.
495 **		else -- some error.
496 **
497 **	Side Effects:
498 **		Returns the current message to the sender via mail.
499 */
500 
501 #define MAXRETURNS	6	/* max depth of returning messages */
502 #define ERRORFUDGE	1024	/* nominal size of error message text */
503 
504 int
returntosender(msg,returnq,flags,e)505 returntosender(msg, returnq, flags, e)
506 	char *msg;
507 	ADDRESS *returnq;
508 	int flags;
509 	register ENVELOPE *e;
510 {
511 	register ENVELOPE *ee;
512 	ENVELOPE *oldcur = CurEnv;
513 	ENVELOPE errenvelope;
514 	static int returndepth = 0;
515 	register ADDRESS *q;
516 	char *p;
517 	char buf[MAXNAME + 1];
518 
519 	if (returnq == NULL)
520 		return -1;
521 
522 	if (msg == NULL)
523 		msg = "Unable to deliver mail";
524 
525 	if (tTd(6, 1))
526 	{
527 		sm_dprintf("\n*** Return To Sender: msg=\"%s\", depth=%d, e=%p, returnq=",
528 			msg, returndepth, e);
529 		printaddr(sm_debug_file(), returnq, true);
530 		if (tTd(6, 20))
531 		{
532 			sm_dprintf("Sendq=");
533 			printaddr(sm_debug_file(), e->e_sendqueue, true);
534 		}
535 	}
536 
537 	if (++returndepth >= MAXRETURNS)
538 	{
539 		if (returndepth != MAXRETURNS)
540 			syserr("554 5.3.0 returntosender: infinite recursion on %s",
541 			       returnq->q_paddr);
542 		/* don't "unrecurse" and fake a clean exit */
543 		/* returndepth--; */
544 		return 0;
545 	}
546 
547 	macdefine(&e->e_macro, A_PERM, 'g', e->e_sender);
548 	macdefine(&e->e_macro, A_PERM, 'u', NULL);
549 
550 	/* initialize error envelope */
551 	ee = newenvelope(&errenvelope, e, sm_rpool_new_x(NULL));
552 	macdefine(&ee->e_macro, A_PERM, 'a', "\201b");
553 	macdefine(&ee->e_macro, A_PERM, 'r', "");
554 	macdefine(&ee->e_macro, A_PERM, 's', "localhost");
555 	macdefine(&ee->e_macro, A_PERM, '_', "localhost");
556 	clrsessenvelope(ee);
557 
558 	ee->e_puthdr = putheader;
559 	ee->e_putbody = errbody;
560 	ee->e_flags |= EF_RESPONSE|EF_METOO;
561 	if (!bitset(EF_OLDSTYLE, e->e_flags))
562 		ee->e_flags &= ~EF_OLDSTYLE;
563 	if (bitset(EF_DONT_MIME, e->e_flags))
564 	{
565 		ee->e_flags |= EF_DONT_MIME;
566 
567 		/*
568 		**  If we can't convert to MIME and we don't pass
569 		**  8-bit, we can't send the body.
570 		*/
571 
572 		if (bitset(EF_HAS8BIT, e->e_flags) &&
573 		    !bitset(MM_PASS8BIT, MimeMode))
574 			flags &= ~RTSF_SEND_BODY;
575 	}
576 
577 	ee->e_sendqueue = returnq;
578 	ee->e_msgsize = 0;
579 	if (bitset(RTSF_SEND_BODY, flags) &&
580 	    !bitset(PRIV_NOBODYRETN, PrivacyFlags))
581 		ee->e_msgsize = ERRORFUDGE + e->e_msgsize;
582 	else
583 		ee->e_flags |= EF_NO_BODY_RETN;
584 
585 	if (!setnewqueue(ee))
586 	{
587 		syserr("554 5.3.0 returntosender: cannot select queue for %s",
588 			       returnq->q_paddr);
589 		ExitStat = EX_UNAVAILABLE;
590 		returndepth--;
591 		return -1;
592 	}
593 	initsys(ee);
594 
595 #if NAMED_BIND
596 	_res.retry = TimeOuts.res_retry[RES_TO_FIRST];
597 	_res.retrans = TimeOuts.res_retrans[RES_TO_FIRST];
598 #endif /* NAMED_BIND */
599 	for (q = returnq; q != NULL; q = q->q_next)
600 	{
601 		if (QS_IS_BADADDR(q->q_state))
602 			continue;
603 
604 		q->q_flags &= ~(QHASNOTIFY|Q_PINGFLAGS);
605 		q->q_flags |= QPINGONFAILURE;
606 
607 		if (!QS_IS_DEAD(q->q_state))
608 			ee->e_nrcpts++;
609 
610 		if (q->q_alias == NULL)
611 			addheader("To", q->q_paddr, 0, ee, true);
612 	}
613 
614 	if (LogLevel > 5)
615 	{
616 		if (bitset(EF_RESPONSE, e->e_flags))
617 			p = "return to sender";
618 		else if (bitset(EF_WARNING, e->e_flags))
619 			p = "sender notify";
620 		else if (bitset(RTSF_PM_BOUNCE, flags))
621 			p = "postmaster notify";
622 		else
623 			p = "DSN";
624 		sm_syslog(LOG_INFO, e->e_id, "%s: %s: %s",
625 			  ee->e_id, p, shortenstring(msg, MAXSHORTSTR));
626 	}
627 
628 	if (SendMIMEErrors)
629 	{
630 		addheader("MIME-Version", "1.0", 0, ee, true);
631 		(void) sm_snprintf(buf, sizeof(buf), "%s.%ld/%.100s",
632 				ee->e_id, (long)curtime(), MyHostName);
633 		ee->e_msgboundary = sm_rpool_strdup_x(ee->e_rpool, buf);
634 		(void) sm_snprintf(buf, sizeof(buf),
635 #if DSN
636 				"multipart/report; report-type=delivery-status;\n\tboundary=\"%s\"",
637 #else /* DSN */
638 				"multipart/mixed; boundary=\"%s\"",
639 #endif /* DSN */
640 				ee->e_msgboundary);
641 		addheader("Content-Type", buf, 0, ee, true);
642 
643 		p = hvalue("Content-Transfer-Encoding", e->e_header);
644 		if (p != NULL && sm_strcasecmp(p, "binary") != 0)
645 			p = NULL;
646 		if (p == NULL && bitset(EF_HAS8BIT, e->e_flags))
647 			p = "8bit";
648 		if (p != NULL)
649 			addheader("Content-Transfer-Encoding", p, 0, ee, true);
650 	}
651 	if (strncmp(msg, "Warning:", 8) == 0)
652 	{
653 		addheader("Subject", msg, 0, ee, true);
654 		p = "warning-timeout";
655 	}
656 	else if (strncmp(msg, "Postmaster warning:", 19) == 0)
657 	{
658 		addheader("Subject", msg, 0, ee, true);
659 		p = "postmaster-warning";
660 	}
661 	else if (strcmp(msg, "Return receipt") == 0)
662 	{
663 		addheader("Subject", msg, 0, ee, true);
664 		p = "return-receipt";
665 	}
666 	else if (bitset(RTSF_PM_BOUNCE, flags))
667 	{
668 		(void) sm_snprintf(buf, sizeof(buf),
669 			 "Postmaster notify: see transcript for details");
670 		addheader("Subject", buf, 0, ee, true);
671 		p = "postmaster-notification";
672 	}
673 	else
674 	{
675 		(void) sm_snprintf(buf, sizeof(buf),
676 			 "Returned mail: see transcript for details");
677 		addheader("Subject", buf, 0, ee, true);
678 		p = "failure";
679 	}
680 	(void) sm_snprintf(buf, sizeof(buf), "auto-generated (%s)", p);
681 	addheader("Auto-Submitted", buf, 0, ee, true);
682 
683 	/* fake up an address header for the from person */
684 	expand("\201n", buf, sizeof(buf), e);
685 	if (parseaddr(buf, &ee->e_from,
686 		      RF_COPYALL|RF_SENDERADDR, '\0', NULL, e, false) == NULL)
687 	{
688 		syserr("553 5.3.5 Can't parse myself!");
689 		ExitStat = EX_SOFTWARE;
690 		returndepth--;
691 		return -1;
692 	}
693 	ee->e_from.q_flags &= ~(QHASNOTIFY|Q_PINGFLAGS);
694 	ee->e_from.q_flags |= QPINGONFAILURE;
695 	ee->e_sender = ee->e_from.q_paddr;
696 
697 	/* push state into submessage */
698 	CurEnv = ee;
699 	macdefine(&ee->e_macro, A_PERM, 'f', "\201n");
700 	macdefine(&ee->e_macro, A_PERM, 'x', "Mail Delivery Subsystem");
701 	eatheader(ee, true, true);
702 
703 	/* mark statistics */
704 	markstats(ee, NULLADDR, STATS_NORMAL);
705 
706 	/* actually deliver the error message */
707 	sendall(ee, SM_DELIVER);
708 
709 	/* restore state */
710 	(void) dropenvelope(ee, true, false);
711 	sm_rpool_free(ee->e_rpool);
712 	CurEnv = oldcur;
713 	returndepth--;
714 
715 	/* check for delivery errors */
716 	if (ee->e_parent == NULL ||
717 	    !bitset(EF_RESPONSE, ee->e_parent->e_flags))
718 		return 0;
719 	for (q = ee->e_sendqueue; q != NULL; q = q->q_next)
720 	{
721 		if (QS_IS_ATTEMPTED(q->q_state))
722 			return 0;
723 	}
724 	return -1;
725 }
726 /*
727 **  ERRBODY -- output the body of an error message.
728 **
729 **	Typically this is a copy of the transcript plus a copy of the
730 **	original offending message.
731 **
732 **	Parameters:
733 **		mci -- the mailer connection information.
734 **		e -- the envelope we are working in.
735 **		separator -- any possible MIME separator (unused).
736 **
737 **	Returns:
738 **		true iff body was written successfully
739 **
740 **	Side Effects:
741 **		Outputs the body of an error message.
742 */
743 
744 /* ARGSUSED2 */
745 static bool
errbody(mci,e,separator)746 errbody(mci, e, separator)
747 	register MCI *mci;
748 	register ENVELOPE *e;
749 	char *separator;
750 {
751 	bool printheader;
752 	bool sendbody;
753 	bool pm_notify;
754 	int save_errno;
755 	register SM_FILE_T *xfile;
756 	char *p;
757 	register ADDRESS *q = NULL;
758 	char actual[MAXLINE];
759 	char buf[MAXLINE];
760 
761 	if (bitset(MCIF_INHEADER, mci->mci_flags))
762 	{
763 		if (!putline("", mci))
764 			goto writeerr;
765 		mci->mci_flags &= ~MCIF_INHEADER;
766 	}
767 	if (e->e_parent == NULL)
768 	{
769 		syserr("errbody: null parent");
770 		if (!putline("   ----- Original message lost -----\n", mci))
771 			goto writeerr;
772 		return true;
773 	}
774 
775 	/*
776 	**  Output MIME header.
777 	*/
778 
779 	if (e->e_msgboundary != NULL)
780 	{
781 		(void) sm_strlcpyn(buf, sizeof(buf), 2, "--", e->e_msgboundary);
782 		if (!putline("This is a MIME-encapsulated message", mci) ||
783 		    !putline("", mci) ||
784 		    !putline(buf, mci) ||
785 		    !putline("", mci))
786 			goto writeerr;
787 	}
788 
789 	/*
790 	**  Output introductory information.
791 	*/
792 
793 	pm_notify = false;
794 	p = hvalue("subject", e->e_header);
795 	if (p != NULL && strncmp(p, "Postmaster ", 11) == 0)
796 		pm_notify = true;
797 	else
798 	{
799 		for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
800 		{
801 			if (QS_IS_BADADDR(q->q_state))
802 				break;
803 		}
804 	}
805 	if (!pm_notify && q == NULL &&
806 	    !bitset(EF_FATALERRS|EF_SENDRECEIPT, e->e_parent->e_flags))
807 	{
808 		if (!putline("    **********************************************",
809 			mci) ||
810 		    !putline("    **      THIS IS A WARNING MESSAGE ONLY      **",
811 			mci) ||
812 		    !putline("    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **",
813 			mci) ||
814 		    !putline("    **********************************************",
815 			mci) ||
816 		    !putline("", mci))
817 			goto writeerr;
818 	}
819 	(void) sm_snprintf(buf, sizeof(buf),
820 		"The original message was received at %s",
821 		arpadate(ctime(&e->e_parent->e_ctime)));
822 	if (!putline(buf, mci))
823 		goto writeerr;
824 	expand("from \201_", buf, sizeof(buf), e->e_parent);
825 	if (!putline(buf, mci))
826 		goto writeerr;
827 
828 	/* include id in postmaster copies */
829 	if (pm_notify && e->e_parent->e_id != NULL)
830 	{
831 		(void) sm_strlcpyn(buf, sizeof(buf), 2, "with id ",
832 			e->e_parent->e_id);
833 		if (!putline(buf, mci))
834 			goto writeerr;
835 	}
836 	if (!putline("", mci))
837 		goto writeerr;
838 
839 	/*
840 	**  Output error message header (if specified and available).
841 	*/
842 
843 	if (ErrMsgFile != NULL &&
844 	    !bitset(EF_SENDRECEIPT, e->e_parent->e_flags))
845 	{
846 		if (*ErrMsgFile == '/')
847 		{
848 			long sff = SFF_ROOTOK|SFF_REGONLY;
849 
850 			if (DontLockReadFiles)
851 				sff |= SFF_NOLOCK;
852 			if (!bitnset(DBS_ERRORHEADERINUNSAFEDIRPATH,
853 				     DontBlameSendmail))
854 				sff |= SFF_SAFEDIRPATH;
855 			xfile = safefopen(ErrMsgFile, O_RDONLY, 0444, sff);
856 			if (xfile != NULL)
857 			{
858 				while (sm_io_fgets(xfile, SM_TIME_DEFAULT, buf,
859 						   sizeof(buf)) != NULL)
860 				{
861 					int lbs;
862 					bool putok;
863 					char *lbp;
864 
865 					lbs = sizeof(buf);
866 					lbp = translate_dollars(buf, buf, &lbs);
867 					expand(lbp, lbp, lbs, e);
868 					putok = putline(lbp, mci);
869 					if (lbp != buf)
870 						sm_free(lbp);
871 					if (!putok)
872 						goto writeerr;
873 				}
874 				(void) sm_io_close(xfile, SM_TIME_DEFAULT);
875 				if (!putline("\n", mci))
876 					goto writeerr;
877 			}
878 		}
879 		else
880 		{
881 			expand(ErrMsgFile, buf, sizeof(buf), e);
882 			if (!putline(buf, mci) || !putline("", mci))
883 				goto writeerr;
884 		}
885 	}
886 
887 	/*
888 	**  Output message introduction
889 	*/
890 
891 	/* permanent fatal errors */
892 	printheader = true;
893 	for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
894 	{
895 		if (!QS_IS_BADADDR(q->q_state) ||
896 		    !bitset(QPINGONFAILURE, q->q_flags))
897 			continue;
898 
899 		if (printheader)
900 		{
901 			if (!putline("   ----- The following addresses had permanent fatal errors -----",
902 					mci))
903 				goto writeerr;
904 			printheader = false;
905 		}
906 
907 		(void) sm_strlcpy(buf, shortenstring(q->q_paddr, MAXSHORTSTR),
908 				  sizeof(buf));
909 		if (!putline(buf, mci))
910 			goto writeerr;
911 		if (q->q_rstatus != NULL)
912 		{
913 			(void) sm_snprintf(buf, sizeof(buf),
914 				"    (reason: %s)",
915 				shortenstring(exitstat(q->q_rstatus),
916 					      MAXSHORTSTR));
917 			if (!putline(buf, mci))
918 				goto writeerr;
919 		}
920 		if (q->q_alias != NULL)
921 		{
922 			(void) sm_snprintf(buf, sizeof(buf),
923 				"    (expanded from: %s)",
924 				shortenstring(q->q_alias->q_paddr,
925 					      MAXSHORTSTR));
926 			if (!putline(buf, mci))
927 				goto writeerr;
928 		}
929 	}
930 	if (!printheader && !putline("", mci))
931 		goto writeerr;
932 
933 	/* transient non-fatal errors */
934 	printheader = true;
935 	for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
936 	{
937 		if (QS_IS_BADADDR(q->q_state) ||
938 		    !bitset(QPRIMARY, q->q_flags) ||
939 		    !bitset(QBYNDELAY, q->q_flags) ||
940 		    !bitset(QDELAYED, q->q_flags))
941 			continue;
942 
943 		if (printheader)
944 		{
945 			if (!putline("   ----- The following addresses had transient non-fatal errors -----",
946 					mci))
947 				goto writeerr;
948 			printheader = false;
949 		}
950 
951 		(void) sm_strlcpy(buf, shortenstring(q->q_paddr, MAXSHORTSTR),
952 				  sizeof(buf));
953 		if (!putline(buf, mci))
954 			goto writeerr;
955 		if (q->q_alias != NULL)
956 		{
957 			(void) sm_snprintf(buf, sizeof(buf),
958 				"    (expanded from: %s)",
959 				shortenstring(q->q_alias->q_paddr,
960 					      MAXSHORTSTR));
961 			if (!putline(buf, mci))
962 				goto writeerr;
963 		}
964 	}
965 	if (!printheader && !putline("", mci))
966 		goto writeerr;
967 
968 	/* successful delivery notifications */
969 	printheader = true;
970 	for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
971 	{
972 		if (QS_IS_BADADDR(q->q_state) ||
973 		    !bitset(QPRIMARY, q->q_flags) ||
974 		    bitset(QBYNDELAY, q->q_flags) ||
975 		    bitset(QDELAYED, q->q_flags))
976 			continue;
977 		else if (bitset(QBYNRELAY, q->q_flags))
978 			p = "Deliver-By notify: relayed";
979 		else if (bitset(QBYTRACE, q->q_flags))
980 			p = "Deliver-By trace: relayed";
981 		else if (!bitset(QPINGONSUCCESS, q->q_flags))
982 			continue;
983 		else if (bitset(QRELAYED, q->q_flags))
984 			p = "relayed to non-DSN-aware mailer";
985 		else if (bitset(QDELIVERED, q->q_flags))
986 		{
987 			if (bitset(QEXPANDED, q->q_flags))
988 				p = "successfully delivered to mailing list";
989 			else
990 				p = "successfully delivered to mailbox";
991 		}
992 		else if (bitset(QEXPANDED, q->q_flags))
993 			p = "expanded by alias";
994 		else
995 			continue;
996 
997 		if (printheader)
998 		{
999 			if (!putline("   ----- The following addresses had successful delivery notifications -----",
1000 					mci))
1001 				goto writeerr;
1002 			printheader = false;
1003 		}
1004 
1005 		(void) sm_snprintf(buf, sizeof(buf), "%s  (%s)",
1006 			 shortenstring(q->q_paddr, MAXSHORTSTR), p);
1007 		if (!putline(buf, mci))
1008 			goto writeerr;
1009 		if (q->q_alias != NULL)
1010 		{
1011 			(void) sm_snprintf(buf, sizeof(buf),
1012 				"    (expanded from: %s)",
1013 				shortenstring(q->q_alias->q_paddr,
1014 					      MAXSHORTSTR));
1015 			if (!putline(buf, mci))
1016 				goto writeerr;
1017 		}
1018 	}
1019 	if (!printheader && !putline("", mci))
1020 		goto writeerr;
1021 
1022 	/*
1023 	**  Output transcript of errors
1024 	*/
1025 
1026 	(void) sm_io_flush(smioout, SM_TIME_DEFAULT);
1027 	if (e->e_parent->e_xfp == NULL)
1028 	{
1029 		if (!putline("   ----- Transcript of session is unavailable -----\n",
1030 				mci))
1031 			goto writeerr;
1032 	}
1033 	else
1034 	{
1035 		printheader = true;
1036 		(void) bfrewind(e->e_parent->e_xfp);
1037 		if (e->e_xfp != NULL)
1038 			(void) sm_io_flush(e->e_xfp, SM_TIME_DEFAULT);
1039 		while (sm_io_fgets(e->e_parent->e_xfp, SM_TIME_DEFAULT, buf,
1040 				   sizeof(buf)) != NULL)
1041 		{
1042 			if (printheader && !putline("   ----- Transcript of session follows -----\n",
1043 						mci))
1044 				goto writeerr;
1045 			printheader = false;
1046 			if (!putline(buf, mci))
1047 				goto writeerr;
1048 		}
1049 	}
1050 	errno = 0;
1051 
1052 #if DSN
1053 	/*
1054 	**  Output machine-readable version.
1055 	*/
1056 
1057 	if (e->e_msgboundary != NULL)
1058 	{
1059 		(void) sm_strlcpyn(buf, sizeof(buf), 2, "--", e->e_msgboundary);
1060 		if (!putline("", mci) ||
1061 		    !putline(buf, mci) ||
1062 		    !putline("Content-Type: message/delivery-status", mci) ||
1063 		    !putline("", mci))
1064 			goto writeerr;
1065 
1066 		/*
1067 		**  Output per-message information.
1068 		*/
1069 
1070 		/* original envelope id from MAIL FROM: line */
1071 		if (e->e_parent->e_envid != NULL)
1072 		{
1073 			(void) sm_snprintf(buf, sizeof(buf),
1074 					"Original-Envelope-Id: %.800s",
1075 					xuntextify(e->e_parent->e_envid));
1076 			if (!putline(buf, mci))
1077 				goto writeerr;
1078 		}
1079 
1080 		/* Reporting-MTA: is us (required) */
1081 		(void) sm_snprintf(buf, sizeof(buf),
1082 				   "Reporting-MTA: dns; %.800s", MyHostName);
1083 		if (!putline(buf, mci))
1084 			goto writeerr;
1085 
1086 		/* DSN-Gateway: not relevant since we are not translating */
1087 
1088 		/* Received-From-MTA: shows where we got this message from */
1089 		if (RealHostName != NULL)
1090 		{
1091 			/* XXX use $s for type? */
1092 			if (e->e_parent->e_from.q_mailer == NULL ||
1093 			    (p = e->e_parent->e_from.q_mailer->m_mtatype) == NULL)
1094 				p = "dns";
1095 			(void) sm_snprintf(buf, sizeof(buf),
1096 					"Received-From-MTA: %s; %.800s",
1097 					p, RealHostName);
1098 			if (!putline(buf, mci))
1099 				goto writeerr;
1100 		}
1101 
1102 		/* Arrival-Date: -- when it arrived here */
1103 		(void) sm_strlcpyn(buf, sizeof(buf), 2, "Arrival-Date: ",
1104 				arpadate(ctime(&e->e_parent->e_ctime)));
1105 		if (!putline(buf, mci))
1106 			goto writeerr;
1107 
1108 		/* Deliver-By-Date: -- when it should have been delivered */
1109 		if (IS_DLVR_BY(e->e_parent))
1110 		{
1111 			time_t dbyd;
1112 
1113 			dbyd = e->e_parent->e_ctime + e->e_parent->e_deliver_by;
1114 			(void) sm_strlcpyn(buf, sizeof(buf), 2,
1115 					"Deliver-By-Date: ",
1116 					arpadate(ctime(&dbyd)));
1117 			if (!putline(buf, mci))
1118 				goto writeerr;
1119 		}
1120 
1121 		/*
1122 		**  Output per-address information.
1123 		*/
1124 
1125 		for (q = e->e_parent->e_sendqueue; q != NULL; q = q->q_next)
1126 		{
1127 			char *action;
1128 
1129 			if (QS_IS_BADADDR(q->q_state))
1130 			{
1131 				/* RFC 1891, 6.2.6 (b) */
1132 				if (bitset(QHASNOTIFY, q->q_flags) &&
1133 				    !bitset(QPINGONFAILURE, q->q_flags))
1134 					continue;
1135 				action = "failed";
1136 			}
1137 			else if (!bitset(QPRIMARY, q->q_flags))
1138 				continue;
1139 			else if (bitset(QDELIVERED, q->q_flags))
1140 			{
1141 				if (bitset(QEXPANDED, q->q_flags))
1142 					action = "delivered (to mailing list)";
1143 				else
1144 					action = "delivered (to mailbox)";
1145 			}
1146 			else if (bitset(QRELAYED, q->q_flags))
1147 				action = "relayed (to non-DSN-aware mailer)";
1148 			else if (bitset(QEXPANDED, q->q_flags))
1149 				action = "expanded (to multi-recipient alias)";
1150 			else if (bitset(QDELAYED, q->q_flags))
1151 				action = "delayed";
1152 			else if (bitset(QBYTRACE, q->q_flags))
1153 				action = "relayed (Deliver-By trace mode)";
1154 			else if (bitset(QBYNDELAY, q->q_flags))
1155 				action = "delayed (Deliver-By notify mode)";
1156 			else if (bitset(QBYNRELAY, q->q_flags))
1157 				action = "relayed (Deliver-By notify mode)";
1158 			else
1159 				continue;
1160 
1161 			if (!putline("", mci))
1162 				goto writeerr;
1163 
1164 			/* Original-Recipient: -- passed from on high */
1165 			if (q->q_orcpt != NULL)
1166 			{
1167 				(void) sm_snprintf(buf, sizeof(buf),
1168 						"Original-Recipient: %.800s",
1169 						q->q_orcpt);
1170 				if (!putline(buf, mci))
1171 					goto writeerr;
1172 			}
1173 
1174 			/* Figure out actual recipient */
1175 			actual[0] = '\0';
1176 			if (q->q_user[0] != '\0')
1177 			{
1178 				if (q->q_mailer != NULL &&
1179 				    q->q_mailer->m_addrtype != NULL)
1180 					p = q->q_mailer->m_addrtype;
1181 				else
1182 					p = "rfc822";
1183 
1184 				if (sm_strcasecmp(p, "rfc822") == 0 &&
1185 				    strchr(q->q_user, '@') == NULL)
1186 				{
1187 					(void) sm_snprintf(actual,
1188 							   sizeof(actual),
1189 							   "%s; %.700s@%.100s",
1190 							   p, q->q_user,
1191 							   MyHostName);
1192 				}
1193 				else
1194 				{
1195 					(void) sm_snprintf(actual,
1196 							   sizeof(actual),
1197 							   "%s; %.800s",
1198 							   p, q->q_user);
1199 				}
1200 			}
1201 
1202 			/* Final-Recipient: -- the name from the RCPT command */
1203 			if (q->q_finalrcpt == NULL)
1204 			{
1205 				/* should never happen */
1206 				sm_syslog(LOG_ERR, e->e_id,
1207 					  "returntosender: q_finalrcpt is NULL");
1208 
1209 				/* try to fall back to the actual recipient */
1210 				if (actual[0] != '\0')
1211 					q->q_finalrcpt = sm_rpool_strdup_x(e->e_rpool,
1212 									   actual);
1213 			}
1214 
1215 			if (q->q_finalrcpt != NULL)
1216 			{
1217 				(void) sm_snprintf(buf, sizeof(buf),
1218 						   "Final-Recipient: %s",
1219 						   q->q_finalrcpt);
1220 				if (!putline(buf, mci))
1221 					goto writeerr;
1222 			}
1223 
1224 			/* X-Actual-Recipient: -- the real problem address */
1225 			if (actual[0] != '\0' &&
1226 			    q->q_finalrcpt != NULL &&
1227 			    !bitset(PRIV_NOACTUALRECIPIENT, PrivacyFlags) &&
1228 			    strcmp(actual, q->q_finalrcpt) != 0)
1229 			{
1230 				(void) sm_snprintf(buf, sizeof(buf),
1231 						   "X-Actual-Recipient: %s",
1232 						   actual);
1233 				if (!putline(buf, mci))
1234 					goto writeerr;
1235 			}
1236 
1237 			/* Action: -- what happened? */
1238 			(void) sm_strlcpyn(buf, sizeof(buf), 2, "Action: ",
1239 				action);
1240 			if (!putline(buf, mci))
1241 				goto writeerr;
1242 
1243 			/* Status: -- what _really_ happened? */
1244 			if (q->q_status != NULL)
1245 				p = q->q_status;
1246 			else if (QS_IS_BADADDR(q->q_state))
1247 				p = "5.0.0";
1248 			else if (QS_IS_QUEUEUP(q->q_state))
1249 				p = "4.0.0";
1250 			else
1251 				p = "2.0.0";
1252 			(void) sm_strlcpyn(buf, sizeof(buf), 2, "Status: ", p);
1253 			if (!putline(buf, mci))
1254 				goto writeerr;
1255 
1256 			/* Remote-MTA: -- who was I talking to? */
1257 			if (q->q_statmta != NULL)
1258 			{
1259 				if (q->q_mailer == NULL ||
1260 				    (p = q->q_mailer->m_mtatype) == NULL)
1261 					p = "dns";
1262 				(void) sm_snprintf(buf, sizeof(buf),
1263 						"Remote-MTA: %s; %.800s",
1264 						p, q->q_statmta);
1265 				p = &buf[strlen(buf) - 1];
1266 				if (*p == '.')
1267 					*p = '\0';
1268 				if (!putline(buf, mci))
1269 					goto writeerr;
1270 			}
1271 
1272 			/* Diagnostic-Code: -- actual result from other end */
1273 			if (q->q_rstatus != NULL)
1274 			{
1275 				if (q->q_mailer == NULL ||
1276 				    (p = q->q_mailer->m_diagtype) == NULL)
1277 					p = "smtp";
1278 				(void) sm_snprintf(buf, sizeof(buf),
1279 						"Diagnostic-Code: %s; %.800s",
1280 						p, q->q_rstatus);
1281 				if (!putline(buf, mci))
1282 					goto writeerr;
1283 			}
1284 
1285 			/* Last-Attempt-Date: -- fine granularity */
1286 			if (q->q_statdate == (time_t) 0L)
1287 				q->q_statdate = curtime();
1288 			(void) sm_strlcpyn(buf, sizeof(buf), 2,
1289 					"Last-Attempt-Date: ",
1290 					arpadate(ctime(&q->q_statdate)));
1291 			if (!putline(buf, mci))
1292 				goto writeerr;
1293 
1294 			/* Will-Retry-Until: -- for delayed messages only */
1295 			if (QS_IS_QUEUEUP(q->q_state))
1296 			{
1297 				time_t xdate;
1298 
1299 				xdate = e->e_parent->e_ctime +
1300 					TimeOuts.to_q_return[e->e_parent->e_timeoutclass];
1301 				(void) sm_strlcpyn(buf, sizeof(buf), 2,
1302 					 "Will-Retry-Until: ",
1303 					 arpadate(ctime(&xdate)));
1304 				if (!putline(buf, mci))
1305 					goto writeerr;
1306 			}
1307 		}
1308 	}
1309 #endif /* DSN */
1310 
1311 	/*
1312 	**  Output text of original message
1313 	*/
1314 
1315 	if (!putline("", mci))
1316 		goto writeerr;
1317 	if (bitset(EF_HAS_DF, e->e_parent->e_flags))
1318 	{
1319 		sendbody = !bitset(EF_NO_BODY_RETN, e->e_parent->e_flags) &&
1320 			   !bitset(EF_NO_BODY_RETN, e->e_flags);
1321 
1322 		if (e->e_msgboundary == NULL)
1323 		{
1324 			if (!putline(
1325 				sendbody
1326 				? "   ----- Original message follows -----\n"
1327 				: "   ----- Message header follows -----\n",
1328 				mci))
1329 			{
1330 				goto writeerr;
1331 			}
1332 		}
1333 		else
1334 		{
1335 			(void) sm_strlcpyn(buf, sizeof(buf), 2, "--",
1336 					e->e_msgboundary);
1337 
1338 			if (!putline(buf, mci))
1339 				goto writeerr;
1340 			(void) sm_strlcpyn(buf, sizeof(buf), 2, "Content-Type: ",
1341 					sendbody ? "message/rfc822"
1342 						 : "text/rfc822-headers");
1343 			if (!putline(buf, mci))
1344 				goto writeerr;
1345 
1346 			p = hvalue("Content-Transfer-Encoding",
1347 				   e->e_parent->e_header);
1348 			if (p != NULL && sm_strcasecmp(p, "binary") != 0)
1349 				p = NULL;
1350 			if (p == NULL &&
1351 			    bitset(EF_HAS8BIT, e->e_parent->e_flags))
1352 				p = "8bit";
1353 			if (p != NULL)
1354 			{
1355 				(void) sm_snprintf(buf, sizeof(buf),
1356 						"Content-Transfer-Encoding: %s",
1357 						p);
1358 				if (!putline(buf, mci))
1359 					goto writeerr;
1360 			}
1361 		}
1362 		if (!putline("", mci))
1363 			goto writeerr;
1364 		save_errno = errno;
1365 		if (!putheader(mci, e->e_parent->e_header, e->e_parent,
1366 				M87F_OUTER))
1367 			goto writeerr;
1368 		errno = save_errno;
1369 		if (sendbody)
1370 		{
1371 			if (!putbody(mci, e->e_parent, e->e_msgboundary))
1372 				goto writeerr;
1373 		}
1374 		else if (e->e_msgboundary == NULL)
1375 		{
1376 			if (!putline("", mci) ||
1377 			    !putline("   ----- Message body suppressed -----",
1378 					mci))
1379 			{
1380 				goto writeerr;
1381 			}
1382 		}
1383 	}
1384 	else if (e->e_msgboundary == NULL)
1385 	{
1386 		if (!putline("  ----- No message was collected -----\n", mci))
1387 			goto writeerr;
1388 	}
1389 
1390 	if (e->e_msgboundary != NULL)
1391 	{
1392 		(void) sm_strlcpyn(buf, sizeof(buf), 3, "--", e->e_msgboundary,
1393 				   "--");
1394 		if (!putline("", mci) || !putline(buf, mci))
1395 			goto writeerr;
1396 	}
1397 	if (!putline("", mci) ||
1398 	    sm_io_flush(mci->mci_out, SM_TIME_DEFAULT) == SM_IO_EOF)
1399 			goto writeerr;
1400 
1401 	/*
1402 	**  Cleanup and exit
1403 	*/
1404 
1405 	if (errno != 0)
1406 	{
1407   writeerr:
1408 		syserr("errbody: I/O error");
1409 		return false;
1410 	}
1411 	return true;
1412 }
1413 
1414 /*
1415 **  SMTPTODSN -- convert SMTP to DSN status code
1416 **
1417 **	Parameters:
1418 **		smtpstat -- the smtp status code (e.g., 550).
1419 **
1420 **	Returns:
1421 **		The DSN version of the status code.
1422 **
1423 **	Storage Management:
1424 **		smtptodsn() returns a pointer to a character string literal,
1425 **		which will remain valid forever, and thus does not need to
1426 **		be copied.  Current code relies on this property.
1427 */
1428 
1429 char *
smtptodsn(smtpstat)1430 smtptodsn(smtpstat)
1431 	int smtpstat;
1432 {
1433 	if (smtpstat < 0)
1434 		return "4.4.2";
1435 
1436 	switch (smtpstat)
1437 	{
1438 	  case 450:	/* Req mail action not taken: mailbox unavailable */
1439 		return "4.2.0";
1440 
1441 	  case 451:	/* Req action aborted: local error in processing */
1442 		return "4.3.0";
1443 
1444 	  case 452:	/* Req action not taken: insufficient sys storage */
1445 		return "4.3.1";
1446 
1447 	  case 500:	/* Syntax error, command unrecognized */
1448 		return "5.5.2";
1449 
1450 	  case 501:	/* Syntax error in parameters or arguments */
1451 		return "5.5.4";
1452 
1453 	  case 502:	/* Command not implemented */
1454 		return "5.5.1";
1455 
1456 	  case 503:	/* Bad sequence of commands */
1457 		return "5.5.1";
1458 
1459 	  case 504:	/* Command parameter not implemented */
1460 		return "5.5.4";
1461 
1462 	  case 550:	/* Req mail action not taken: mailbox unavailable */
1463 		return "5.2.0";
1464 
1465 	  case 551:	/* User not local; please try <...> */
1466 		return "5.1.6";
1467 
1468 	  case 552:	/* Req mail action aborted: exceeded storage alloc */
1469 		return "5.2.2";
1470 
1471 	  case 553:	/* Req action not taken: mailbox name not allowed */
1472 		return "5.1.0";
1473 
1474 	  case 554:	/* Transaction failed */
1475 		return "5.0.0";
1476 	}
1477 
1478 	if (REPLYTYPE(smtpstat) == 2)
1479 		return "2.0.0";
1480 	if (REPLYTYPE(smtpstat) == 4)
1481 		return "4.0.0";
1482 	return "5.0.0";
1483 }
1484 /*
1485 **  XTEXTIFY -- take regular text and turn it into DSN-style xtext
1486 **
1487 **	Parameters:
1488 **		t -- the text to convert.
1489 **		taboo -- additional characters that must be encoded.
1490 **
1491 **	Returns:
1492 **		The xtext-ified version of the same string.
1493 */
1494 
1495 char *
xtextify(t,taboo)1496 xtextify(t, taboo)
1497 	register char *t;
1498 	char *taboo;
1499 {
1500 	register char *p;
1501 	int l;
1502 	int nbogus;
1503 	static char *bp = NULL;
1504 	static int bplen = 0;
1505 
1506 	if (taboo == NULL)
1507 		taboo = "";
1508 
1509 	/* figure out how long this xtext will have to be */
1510 	nbogus = l = 0;
1511 	for (p = t; *p != '\0'; p++)
1512 	{
1513 		register int c = (*p & 0xff);
1514 
1515 		/* ASCII dependence here -- this is the way the spec words it */
1516 		if (c < '!' || c > '~' || c == '+' || c == '\\' || c == '(' ||
1517 		    strchr(taboo, c) != NULL)
1518 			nbogus++;
1519 		l++;
1520 	}
1521 	if (nbogus < 0)
1522 	{
1523 		/* since nbogus is ssize_t and wrapped, 2 * size_t would wrap */
1524 		syserr("!xtextify string too long");
1525 	}
1526 	if (nbogus == 0)
1527 		return t;
1528 	l += nbogus * 2 + 1;
1529 
1530 	/* now allocate space if necessary for the new string */
1531 	if (l > bplen)
1532 	{
1533 		if (bp != NULL)
1534 			sm_free(bp); /* XXX */
1535 		bp = sm_pmalloc_x(l);
1536 		bplen = l;
1537 	}
1538 
1539 	/* ok, copy the text with byte expansion */
1540 	for (p = bp; *t != '\0'; )
1541 	{
1542 		register int c = (*t++ & 0xff);
1543 
1544 		/* ASCII dependence here -- this is the way the spec words it */
1545 		if (c < '!' || c > '~' || c == '+' || c == '\\' || c == '(' ||
1546 		    strchr(taboo, c) != NULL)
1547 		{
1548 			*p++ = '+';
1549 			*p++ = "0123456789ABCDEF"[c >> 4];
1550 			*p++ = "0123456789ABCDEF"[c & 0xf];
1551 		}
1552 		else
1553 			*p++ = c;
1554 	}
1555 	*p = '\0';
1556 	return bp;
1557 }
1558 /*
1559 **  XUNTEXTIFY -- take xtext and turn it into plain text
1560 **
1561 **	Parameters:
1562 **		t -- the xtextified text.
1563 **
1564 **	Returns:
1565 **		The decoded text.  No attempt is made to deal with
1566 **		null strings in the resulting text.
1567 */
1568 
1569 char *
xuntextify(t)1570 xuntextify(t)
1571 	register char *t;
1572 {
1573 	register char *p;
1574 	int l;
1575 	static char *bp = NULL;
1576 	static int bplen = 0;
1577 
1578 	/* heuristic -- if no plus sign, just return the input */
1579 	if (strchr(t, '+') == NULL)
1580 		return t;
1581 
1582 	/* xtext is always longer than decoded text */
1583 	l = strlen(t);
1584 	if (l > bplen)
1585 	{
1586 		if (bp != NULL)
1587 			sm_free(bp); /* XXX */
1588 		bp = xalloc(l);
1589 		bplen = l;
1590 	}
1591 
1592 	/* ok, copy the text with byte compression */
1593 	for (p = bp; *t != '\0'; t++)
1594 	{
1595 		register int c = *t & 0xff;
1596 
1597 		if (c != '+')
1598 		{
1599 			*p++ = c;
1600 			continue;
1601 		}
1602 
1603 		c = *++t & 0xff;
1604 		if (!isascii(c) || !isxdigit(c))
1605 		{
1606 			/* error -- first digit is not hex */
1607 			usrerr("bogus xtext: +%c", c);
1608 			t--;
1609 			continue;
1610 		}
1611 		if (isdigit(c))
1612 			c -= '0';
1613 		else if (isupper(c))
1614 			c -= 'A' - 10;
1615 		else
1616 			c -= 'a' - 10;
1617 		*p = c << 4;
1618 
1619 		c = *++t & 0xff;
1620 		if (!isascii(c) || !isxdigit(c))
1621 		{
1622 			/* error -- second digit is not hex */
1623 			usrerr("bogus xtext: +%x%c", *p >> 4, c);
1624 			t--;
1625 			continue;
1626 		}
1627 		if (isdigit(c))
1628 			c -= '0';
1629 		else if (isupper(c))
1630 			c -= 'A' - 10;
1631 		else
1632 			c -= 'a' - 10;
1633 		*p++ |= c;
1634 	}
1635 	*p = '\0';
1636 	return bp;
1637 }
1638 /*
1639 **  XTEXTOK -- check if a string is legal xtext
1640 **
1641 **	Xtext is used in Delivery Status Notifications.  The spec was
1642 **	taken from RFC 1891, ``SMTP Service Extension for Delivery
1643 **	Status Notifications''.
1644 **
1645 **	Parameters:
1646 **		s -- the string to check.
1647 **
1648 **	Returns:
1649 **		true -- if 's' is legal xtext.
1650 **		false -- if it has any illegal characters in it.
1651 */
1652 
1653 bool
xtextok(s)1654 xtextok(s)
1655 	char *s;
1656 {
1657 	int c;
1658 
1659 	while ((c = *s++) != '\0')
1660 	{
1661 		if (c == '+')
1662 		{
1663 			c = *s++;
1664 			if (!isascii(c) || !isxdigit(c))
1665 				return false;
1666 			c = *s++;
1667 			if (!isascii(c) || !isxdigit(c))
1668 				return false;
1669 		}
1670 		else if (c < '!' || c > '~' || c == '=')
1671 			return false;
1672 	}
1673 	return true;
1674 }
1675 /*
1676 **  PRUNEROUTE -- prune an RFC-822 source route
1677 **
1678 **	Trims down a source route to the last internet-registered hop.
1679 **	This is encouraged by RFC 1123 section 5.3.3.
1680 **
1681 **	Parameters:
1682 **		addr -- the address
1683 **
1684 **	Returns:
1685 **		true -- address was modified
1686 **		false -- address could not be pruned
1687 **
1688 **	Side Effects:
1689 **		modifies addr in-place
1690 */
1691 
1692 static bool
pruneroute(addr)1693 pruneroute(addr)
1694 	char *addr;
1695 {
1696 #if NAMED_BIND
1697 	char *start, *at, *comma;
1698 	char c;
1699 	int braclev;
1700 	int rcode;
1701 	int i;
1702 	char hostbuf[BUFSIZ];
1703 	char *mxhosts[MAXMXHOSTS + 1];
1704 
1705 	/* check to see if this is really a route-addr */
1706 	if (*addr != '<' || addr[1] != '@' || addr[strlen(addr) - 1] != '>')
1707 		return false;
1708 
1709 	/*
1710 	**  Can't simply find the first ':' is the address might be in the
1711 	**  form:  "<@[IPv6:::1]:user@host>" and the first ':' in inside
1712 	**  the IPv6 address.
1713 	*/
1714 
1715 	start = addr;
1716 	braclev = 0;
1717 	while (*start != '\0')
1718 	{
1719 		if (*start == ':' && braclev <= 0)
1720 			break;
1721 		else if (*start == '[')
1722 			braclev++;
1723 		else if (*start == ']' && braclev > 0)
1724 			braclev--;
1725 		start++;
1726 	}
1727 	if (braclev > 0 || *start != ':')
1728 		return false;
1729 
1730 	at = strrchr(addr, '@');
1731 	if (at == NULL || at < start)
1732 		return false;
1733 
1734 	/* slice off the angle brackets */
1735 	i = strlen(at + 1);
1736 	if (i >= sizeof(hostbuf))
1737 		return false;
1738 	(void) sm_strlcpy(hostbuf, at + 1, sizeof(hostbuf));
1739 	hostbuf[i - 1] = '\0';
1740 
1741 	while (start != NULL)
1742 	{
1743 		if (getmxrr(hostbuf, mxhosts, NULL, false,
1744 			    &rcode, true, NULL) > 0)
1745 		{
1746 			(void) sm_strlcpy(addr + 1, start + 1,
1747 					  strlen(addr) - 1);
1748 			return true;
1749 		}
1750 		c = *start;
1751 		*start = '\0';
1752 		comma = strrchr(addr, ',');
1753 		if (comma != NULL && comma[1] == '@' &&
1754 		    strlen(comma + 2) < sizeof(hostbuf))
1755 			(void) sm_strlcpy(hostbuf, comma + 2, sizeof(hostbuf));
1756 		else
1757 			comma = NULL;
1758 		*start = c;
1759 		start = comma;
1760 	}
1761 #endif /* NAMED_BIND */
1762 	return false;
1763 }
1764