1 /*
2  * Copyright (c) 1983 Eric P. Allman
3  * Copyright (c) 1988 Regents of the University of California.
4  * All rights reserved.
5  *
6  * %sccs.include.redist.c%
7  */
8 
9 # include "sendmail.h"
10 
11 #ifndef lint
12 #ifdef SMTP
13 static char sccsid[] = "@(#)srvrsmtp.c	6.42 (Berkeley) 04/13/93 (with SMTP)";
14 #else
15 static char sccsid[] = "@(#)srvrsmtp.c	6.42 (Berkeley) 04/13/93 (without SMTP)";
16 #endif
17 #endif /* not lint */
18 
19 # include <errno.h>
20 # include <signal.h>
21 
22 # ifdef SMTP
23 
24 /*
25 **  SMTP -- run the SMTP protocol.
26 **
27 **	Parameters:
28 **		none.
29 **
30 **	Returns:
31 **		never.
32 **
33 **	Side Effects:
34 **		Reads commands from the input channel and processes
35 **			them.
36 */
37 
38 struct cmd
39 {
40 	char	*cmdname;	/* command name */
41 	int	cmdcode;	/* internal code, see below */
42 };
43 
44 /* values for cmdcode */
45 # define CMDERROR	0	/* bad command */
46 # define CMDMAIL	1	/* mail -- designate sender */
47 # define CMDRCPT	2	/* rcpt -- designate recipient */
48 # define CMDDATA	3	/* data -- send message text */
49 # define CMDRSET	4	/* rset -- reset state */
50 # define CMDVRFY	5	/* vrfy -- verify address */
51 # define CMDEXPN	6	/* expn -- expand address */
52 # define CMDNOOP	7	/* noop -- do nothing */
53 # define CMDQUIT	8	/* quit -- close connection and die */
54 # define CMDHELO	9	/* helo -- be polite */
55 # define CMDHELP	10	/* help -- give usage info */
56 # define CMDEHLO	11	/* ehlo -- extended helo (RFC 1425) */
57 /* non-standard commands */
58 # define CMDONEX	16	/* onex -- sending one transaction only */
59 # define CMDVERB	17	/* verb -- go into verbose mode */
60 /* debugging-only commands, only enabled if SMTPDEBUG is defined */
61 # define CMDDBGQSHOW	24	/* showq -- show send queue */
62 # define CMDDBGDEBUG	25	/* debug -- set debug mode */
63 
64 static struct cmd	CmdTab[] =
65 {
66 	"mail",		CMDMAIL,
67 	"rcpt",		CMDRCPT,
68 	"data",		CMDDATA,
69 	"rset",		CMDRSET,
70 	"vrfy",		CMDVRFY,
71 	"expn",		CMDEXPN,
72 	"help",		CMDHELP,
73 	"noop",		CMDNOOP,
74 	"quit",		CMDQUIT,
75 	"helo",		CMDHELO,
76 	"ehlo",		CMDEHLO,
77 	"verb",		CMDVERB,
78 	"onex",		CMDONEX,
79 	/*
80 	 * remaining commands are here only
81 	 * to trap and log attempts to use them
82 	 */
83 	"showq",	CMDDBGQSHOW,
84 	"debug",	CMDDBGDEBUG,
85 	NULL,		CMDERROR,
86 };
87 
88 bool	InChild = FALSE;		/* true if running in a subprocess */
89 bool	OneXact = FALSE;		/* one xaction only this run */
90 
91 #define EX_QUIT		22		/* special code for QUIT command */
92 
93 smtp(e)
94 	register ENVELOPE *e;
95 {
96 	register char *p;
97 	register struct cmd *c;
98 	char *cmd;
99 	static char *skipword();
100 	auto ADDRESS *vrfyqueue;
101 	ADDRESS *a;
102 	bool gotmail;			/* mail command received */
103 	bool gothello;			/* helo command received */
104 	bool vrfy;			/* set if this is a vrfy command */
105 	char *protocol;			/* sending protocol */
106 	char *sendinghost;		/* sending hostname */
107 	long msize;			/* approximate maximum message size */
108 	auto char *delimptr;
109 	char *id;
110 	char inp[MAXLINE];
111 	char cmdbuf[MAXLINE];
112 	extern char Version[];
113 	extern char *macvalue();
114 	extern ADDRESS *recipient();
115 	extern ENVELOPE BlankEnvelope;
116 	extern ENVELOPE *newenvelope();
117 	extern char *anynet_ntoa();
118 
119 	if (OutChannel != stdout)
120 	{
121 		/* arrange for debugging output to go to remote host */
122 		(void) close(1);
123 		(void) dup(fileno(OutChannel));
124 	}
125 	settime(e);
126 	CurHostName = RealHostName;
127 	setproctitle("srvrsmtp %s startup", CurHostName);
128 	expand("\201e", inp, &inp[sizeof inp], e);
129 	message("220 %s", inp);
130 	protocol = NULL;
131 	sendinghost = macvalue('s', e);
132 	gothello = FALSE;
133 	gotmail = FALSE;
134 	for (;;)
135 	{
136 		/* arrange for backout */
137 		if (setjmp(TopFrame) > 0 && InChild)
138 		{
139 			QuickAbort = FALSE;
140 			SuprErrs = TRUE;
141 			finis();
142 		}
143 		QuickAbort = FALSE;
144 		HoldErrs = FALSE;
145 		LogUsrErrs = FALSE;
146 		e->e_flags &= ~EF_VRFYONLY;
147 
148 		/* setup for the read */
149 		e->e_to = NULL;
150 		Errors = 0;
151 		(void) fflush(stdout);
152 
153 		/* read the input line */
154 		SmtpPhase = "srvrsmtp cmd read";
155 		setproctitle("srvrsmtp %s cmd read", CurHostName);
156 		p = sfgets(inp, sizeof inp, InChannel, TimeOuts.to_nextcommand);
157 
158 		/* handle errors */
159 		if (p == NULL)
160 		{
161 			/* end of file, just die */
162 			message("421 %s Lost input channel from %s",
163 				MyHostName, CurHostName);
164 #ifdef LOG
165 			if (LogLevel > 1)
166 				syslog(LOG_NOTICE, "lost input channel from %s",
167 					CurHostName);
168 #endif
169 			if (InChild)
170 				ExitStat = EX_QUIT;
171 			finis();
172 		}
173 
174 		/* clean up end of line */
175 		fixcrlf(inp, TRUE);
176 
177 		/* echo command to transcript */
178 		if (e->e_xfp != NULL)
179 			fprintf(e->e_xfp, "<<< %s\n", inp);
180 
181 		if (e->e_id == NULL)
182 			setproctitle("%s: %s", CurHostName, inp);
183 		else
184 			setproctitle("%s %s: %s", e->e_id, CurHostName, inp);
185 
186 		/* break off command */
187 		for (p = inp; isascii(*p) && isspace(*p); p++)
188 			continue;
189 		cmd = cmdbuf;
190 		while (*p != '\0' &&
191 		       !(isascii(*p) && isspace(*p)) &&
192 		       cmd < &cmdbuf[sizeof cmdbuf - 2])
193 			*cmd++ = *p++;
194 		*cmd = '\0';
195 
196 		/* throw away leading whitespace */
197 		while (isascii(*p) && isspace(*p))
198 			p++;
199 
200 		/* decode command */
201 		for (c = CmdTab; c->cmdname != NULL; c++)
202 		{
203 			if (!strcasecmp(c->cmdname, cmdbuf))
204 				break;
205 		}
206 
207 		/* reset errors */
208 		errno = 0;
209 
210 		/* process command */
211 		switch (c->cmdcode)
212 		{
213 		  case CMDHELO:		/* hello -- introduce yourself */
214 		  case CMDEHLO:		/* extended hello */
215 			if (c->cmdcode == CMDEHLO)
216 			{
217 				protocol = "ESMTP";
218 				SmtpPhase = "EHLO";
219 			}
220 			else
221 			{
222 				protocol = "SMTP";
223 				SmtpPhase = "HELO";
224 			}
225 			sendinghost = newstr(p);
226 			if (strcasecmp(p, RealHostName) != 0)
227 			{
228 				auth_warning(e, "Host %s claimed to be %s",
229 					RealHostName, p);
230 			}
231 			p = macvalue('_', e);
232 			if (p == NULL)
233 				p = RealHostName;
234 
235 			/* send ext. message -- old systems must ignore */
236 			message("250-%s Hello %s, pleased to meet you",
237 				MyHostName, p);
238 			if (!bitset(PRIV_NOEXPN, PrivacyFlags))
239 				message("250-EXPN");
240 			message("250-SIZE");
241 			message("250 HELP");
242 			gothello = TRUE;
243 			break;
244 
245 		  case CMDMAIL:		/* mail -- designate sender */
246 			SmtpPhase = "MAIL";
247 
248 			/* check for validity of this command */
249 			if (!gothello)
250 			{
251 				/* set sending host to our known value */
252 				if (sendinghost == NULL)
253 					sendinghost = RealHostName;
254 
255 				if (bitset(PRIV_NEEDMAILHELO, PrivacyFlags))
256 				{
257 					message("503 Polite people say HELO first");
258 					break;
259 				}
260 				else
261 				{
262 					auth_warning(e,
263 						"Host %s didn't use HELO protocol",
264 						RealHostName);
265 				}
266 			}
267 			if (gotmail)
268 			{
269 				message("503 Sender already specified");
270 				break;
271 			}
272 			if (InChild)
273 			{
274 				errno = 0;
275 				syserr("503 Nested MAIL command: MAIL %s", p);
276 				finis();
277 			}
278 
279 			/* fork a subprocess to process this command */
280 			if (runinchild("SMTP-MAIL", e) > 0)
281 				break;
282 			if (protocol == NULL)
283 				protocol = "SMTP";
284 			define('r', protocol, e);
285 			define('s', sendinghost, e);
286 			initsys(e);
287 			setproctitle("%s %s: %s", e->e_id, CurHostName, inp);
288 
289 			/* child -- go do the processing */
290 			p = skipword(p, "from");
291 			if (p == NULL)
292 				break;
293 			if (setjmp(TopFrame) > 0)
294 			{
295 				/* this failed -- undo work */
296 				if (InChild)
297 				{
298 					QuickAbort = FALSE;
299 					SuprErrs = TRUE;
300 					finis();
301 				}
302 				break;
303 			}
304 			QuickAbort = TRUE;
305 
306 			/* must parse sender first */
307 			delimptr = NULL;
308 			setsender(p, e, &delimptr, FALSE);
309 			p = delimptr;
310 			if (p != NULL && *p != '\0')
311 				*p++ = '\0';
312 
313 			/* now parse ESMTP arguments */
314 			msize = 0;
315 			for (; p != NULL && *p != '\0'; p++)
316 			{
317 				char *kp;
318 				char *vp;
319 
320 				/* locate the beginning of the keyword */
321 				while (isascii(*p) && isspace(*p))
322 					p++;
323 				if (*p == '\0')
324 					break;
325 				kp = p;
326 
327 				/* skip to the value portion */
328 				while (isascii(*p) && isalnum(*p) || *p == '-')
329 					p++;
330 				if (*p == '=')
331 				{
332 					*p++ = '\0';
333 					vp = p;
334 
335 					/* skip to the end of the value */
336 					while (*p != '\0' && *p != ' ' &&
337 					       !(isascii(*p) && iscntrl(*p)) &&
338 					       *p != '=')
339 						p++;
340 				}
341 
342 				if (*p != '\0')
343 					*p++ = '\0';
344 
345 				if (tTd(19, 1))
346 					printf("MAIL: got arg %s=%s\n", kp,
347 						vp == NULL ? "<null>" : vp);
348 
349 				if (strcasecmp(kp, "size") == 0)
350 				{
351 					if (kp == NULL)
352 					{
353 						usrerr("501 SIZE requires a value");
354 						/* NOTREACHED */
355 					}
356 					msize = atol(vp);
357 				}
358 				else
359 				{
360 					usrerr("501 %s parameter unrecognized", kp);
361 					/* NOTREACHED */
362 				}
363 			}
364 
365 			if (!enoughspace(msize))
366 			{
367 				message("452 Insufficient disk space; try again later");
368 				break;
369 			}
370 			message("250 Sender ok");
371 			gotmail = TRUE;
372 			break;
373 
374 		  case CMDRCPT:		/* rcpt -- designate recipient */
375 			if (!gotmail)
376 			{
377 				usrerr("503 Need MAIL before RCPT");
378 				break;
379 			}
380 			SmtpPhase = "RCPT";
381 			if (setjmp(TopFrame) > 0)
382 			{
383 				e->e_flags &= ~EF_FATALERRS;
384 				break;
385 			}
386 			QuickAbort = TRUE;
387 			LogUsrErrs = TRUE;
388 
389 			e->e_flags |= EF_VRFYONLY;
390 
391 			p = skipword(p, "to");
392 			if (p == NULL)
393 				break;
394 			a = parseaddr(p, (ADDRESS *) NULL, 1, ' ', NULL, e);
395 			if (a == NULL)
396 				break;
397 			a->q_flags |= QPRIMARY;
398 			a = recipient(a, &e->e_sendqueue, e);
399 			if (Errors != 0)
400 				break;
401 
402 			/* no errors during parsing, but might be a duplicate */
403 			e->e_to = p;
404 			if (!bitset(QBADADDR, a->q_flags))
405 				message("250 Recipient ok");
406 			else
407 			{
408 				/* punt -- should keep message in ADDRESS.... */
409 				message("550 Addressee unknown");
410 			}
411 			e->e_to = NULL;
412 			break;
413 
414 		  case CMDDATA:		/* data -- text of mail */
415 			SmtpPhase = "DATA";
416 			if (!gotmail)
417 			{
418 				message("503 Need MAIL command");
419 				break;
420 			}
421 			else if (e->e_nrcpts <= 0)
422 			{
423 				message("503 Need RCPT (recipient)");
424 				break;
425 			}
426 
427 			/* check to see if we need to re-expand aliases */
428 			for (a = e->e_sendqueue; a != NULL; a = a->q_next)
429 			{
430 				if (bitset(QVERIFIED, a->q_flags))
431 					break;
432 			}
433 
434 			/* collect the text of the message */
435 			SmtpPhase = "collect";
436 			collect(TRUE, a != NULL, e);
437 			if (Errors != 0)
438 				break;
439 
440 			/*
441 			**  Arrange to send to everyone.
442 			**	If sending to multiple people, mail back
443 			**		errors rather than reporting directly.
444 			**	In any case, don't mail back errors for
445 			**		anything that has happened up to
446 			**		now (the other end will do this).
447 			**	Truncate our transcript -- the mail has gotten
448 			**		to us successfully, and if we have
449 			**		to mail this back, it will be easier
450 			**		on the reader.
451 			**	Then send to everyone.
452 			**	Finally give a reply code.  If an error has
453 			**		already been given, don't mail a
454 			**		message back.
455 			**	We goose error returns by clearing error bit.
456 			*/
457 
458 			SmtpPhase = "delivery";
459 			if (e->e_nrcpts != 1)
460 			{
461 				HoldErrs = TRUE;
462 				e->e_errormode = EM_MAIL;
463 			}
464 			e->e_flags &= ~EF_FATALERRS;
465 			e->e_xfp = freopen(queuename(e, 'x'), "w", e->e_xfp);
466 			id = e->e_id;
467 
468 			/* send to all recipients */
469 			sendall(e, a == NULL ? SM_DEFAULT : SM_QUEUE);
470 			e->e_to = NULL;
471 
472 			/* save statistics */
473 			markstats(e, (ADDRESS *) NULL);
474 
475 			/* issue success if appropriate and reset */
476 			if (Errors == 0 || HoldErrs)
477 				message("250 %s Message accepted for delivery", id);
478 			else
479 				e->e_flags &= ~EF_FATALERRS;
480 
481 			/* if we just queued, poke it */
482 			if (a != NULL && e->e_sendmode != SM_QUEUE)
483 			{
484 				unlockqueue(e);
485 				dowork(id, TRUE, TRUE, e);
486 				e->e_id = NULL;
487 			}
488 
489 			/* if in a child, pop back to our parent */
490 			if (InChild)
491 				finis();
492 
493 			/* clean up a bit */
494 			gotmail = FALSE;
495 			dropenvelope(e);
496 			CurEnv = e = newenvelope(e, CurEnv);
497 			e->e_flags = BlankEnvelope.e_flags;
498 			break;
499 
500 		  case CMDRSET:		/* rset -- reset state */
501 			message("250 Reset state");
502 			if (InChild)
503 				finis();
504 
505 			/* clean up a bit */
506 			gotmail = FALSE;
507 			dropenvelope(e);
508 			CurEnv = e = newenvelope(e, CurEnv);
509 			break;
510 
511 		  case CMDVRFY:		/* vrfy -- verify address */
512 		  case CMDEXPN:		/* expn -- expand address */
513 			vrfy = c->cmdcode == CMDVRFY;
514 			if (bitset(vrfy ? PRIV_NOVRFY : PRIV_NOEXPN,
515 						PrivacyFlags))
516 			{
517 				if (vrfy)
518 					message("252 Who's to say?");
519 				else
520 					message("502 That's none of your business");
521 				break;
522 			}
523 			else if (!gothello &&
524 				 bitset(vrfy ? PRIV_NEEDVRFYHELO : PRIV_NEEDEXPNHELO,
525 						PrivacyFlags))
526 			{
527 				message("503 I demand that you introduce yourself first");
528 				break;
529 			}
530 			if (runinchild(vrfy ? "SMTP-VRFY" : "SMTP-EXPN", e) > 0)
531 				break;
532 #ifdef LOG
533 			if (LogLevel > 5)
534 				syslog(LOG_INFO, "%s: %s", CurHostName, inp);
535 #endif
536 			vrfyqueue = NULL;
537 			QuickAbort = TRUE;
538 			if (vrfy)
539 				e->e_flags |= EF_VRFYONLY;
540 			(void) sendtolist(p, (ADDRESS *) NULL, &vrfyqueue, e);
541 			if (Errors != 0)
542 			{
543 				if (InChild)
544 					finis();
545 				break;
546 			}
547 			while (vrfyqueue != NULL)
548 			{
549 				register ADDRESS *a = vrfyqueue->q_next;
550 				char *code;
551 
552 				while (a != NULL && bitset(QDONTSEND|QBADADDR, a->q_flags))
553 					a = a->q_next;
554 
555 				if (!bitset(QDONTSEND|QBADADDR, vrfyqueue->q_flags))
556 					printvrfyaddr(vrfyqueue, a == NULL);
557 				else if (a == NULL)
558 					message("554 Self destructive alias loop");
559 				vrfyqueue = a;
560 			}
561 			if (InChild)
562 				finis();
563 			break;
564 
565 		  case CMDHELP:		/* help -- give user info */
566 			help(p);
567 			break;
568 
569 		  case CMDNOOP:		/* noop -- do nothing */
570 			message("200 OK");
571 			break;
572 
573 		  case CMDQUIT:		/* quit -- leave mail */
574 			message("221 %s closing connection", MyHostName);
575 			if (InChild)
576 				ExitStat = EX_QUIT;
577 			finis();
578 
579 		  case CMDVERB:		/* set verbose mode */
580 			Verbose = TRUE;
581 			e->e_sendmode = SM_DELIVER;
582 			message("200 Verbose mode");
583 			break;
584 
585 		  case CMDONEX:		/* doing one transaction only */
586 			OneXact = TRUE;
587 			message("200 Only one transaction");
588 			break;
589 
590 # ifdef SMTPDEBUG
591 		  case CMDDBGQSHOW:	/* show queues */
592 			printf("Send Queue=");
593 			printaddr(e->e_sendqueue, TRUE);
594 			break;
595 
596 		  case CMDDBGDEBUG:	/* set debug mode */
597 			tTsetup(tTdvect, sizeof tTdvect, "0-99.1");
598 			tTflag(p);
599 			message("200 Debug set");
600 			break;
601 
602 # else /* not SMTPDEBUG */
603 
604 		  case CMDDBGQSHOW:	/* show queues */
605 		  case CMDDBGDEBUG:	/* set debug mode */
606 # ifdef LOG
607 			if (LogLevel > 0)
608 				syslog(LOG_NOTICE,
609 				    "\"%s\" command from %s (%s)",
610 				    c->cmdname, RealHostName,
611 				    anynet_ntoa(&RealHostAddr));
612 # endif
613 			/* FALL THROUGH */
614 # endif /* SMTPDEBUG */
615 
616 		  case CMDERROR:	/* unknown command */
617 			message("500 Command unrecognized");
618 			break;
619 
620 		  default:
621 			errno = 0;
622 			syserr("500 smtp: unknown code %d", c->cmdcode);
623 			break;
624 		}
625 	}
626 }
627 /*
628 **  SKIPWORD -- skip a fixed word.
629 **
630 **	Parameters:
631 **		p -- place to start looking.
632 **		w -- word to skip.
633 **
634 **	Returns:
635 **		p following w.
636 **		NULL on error.
637 **
638 **	Side Effects:
639 **		clobbers the p data area.
640 */
641 
642 static char *
643 skipword(p, w)
644 	register char *p;
645 	char *w;
646 {
647 	register char *q;
648 
649 	/* find beginning of word */
650 	while (isascii(*p) && isspace(*p))
651 		p++;
652 	q = p;
653 
654 	/* find end of word */
655 	while (*p != '\0' && *p != ':' && !(isascii(*p) && isspace(*p)))
656 		p++;
657 	while (isascii(*p) && isspace(*p))
658 		*p++ = '\0';
659 	if (*p != ':')
660 	{
661 	  syntax:
662 		message("501 Syntax error");
663 		Errors++;
664 		return (NULL);
665 	}
666 	*p++ = '\0';
667 	while (isascii(*p) && isspace(*p))
668 		p++;
669 
670 	/* see if the input word matches desired word */
671 	if (strcasecmp(q, w))
672 		goto syntax;
673 
674 	return (p);
675 }
676 /*
677 **  PRINTVRFYADDR -- print an entry in the verify queue
678 **
679 **	Parameters:
680 **		a -- the address to print
681 **		last -- set if this is the last one.
682 **
683 **	Returns:
684 **		none.
685 **
686 **	Side Effects:
687 **		Prints the appropriate 250 codes.
688 */
689 
690 printvrfyaddr(a, last)
691 	register ADDRESS *a;
692 	bool last;
693 {
694 	char fmtbuf[20];
695 
696 	strcpy(fmtbuf, "250");
697 	fmtbuf[3] = last ? ' ' : '-';
698 
699 	if (strchr(a->q_paddr, '<') != NULL)
700 		strcpy(&fmtbuf[4], "%s");
701 	else if (a->q_fullname == NULL)
702 		strcpy(&fmtbuf[4], "<%s>");
703 	else
704 	{
705 		strcpy(&fmtbuf[4], "%s <%s>");
706 		message(fmtbuf, a->q_fullname, a->q_paddr);
707 		return;
708 	}
709 	message(fmtbuf, a->q_paddr);
710 }
711 /*
712 **  HELP -- implement the HELP command.
713 **
714 **	Parameters:
715 **		topic -- the topic we want help for.
716 **
717 **	Returns:
718 **		none.
719 **
720 **	Side Effects:
721 **		outputs the help file to message output.
722 */
723 
724 help(topic)
725 	char *topic;
726 {
727 	register FILE *hf;
728 	int len;
729 	char buf[MAXLINE];
730 	bool noinfo;
731 
732 	if (HelpFile == NULL || (hf = fopen(HelpFile, "r")) == NULL)
733 	{
734 		/* no help */
735 		errno = 0;
736 		message("502 HELP not implemented");
737 		return;
738 	}
739 
740 	if (topic == NULL || *topic == '\0')
741 		topic = "smtp";
742 	else
743 		makelower(topic);
744 
745 	len = strlen(topic);
746 	noinfo = TRUE;
747 
748 	while (fgets(buf, sizeof buf, hf) != NULL)
749 	{
750 		if (strncmp(buf, topic, len) == 0)
751 		{
752 			register char *p;
753 
754 			p = strchr(buf, '\t');
755 			if (p == NULL)
756 				p = buf;
757 			else
758 				p++;
759 			fixcrlf(p, TRUE);
760 			message("214-%s", p);
761 			noinfo = FALSE;
762 		}
763 	}
764 
765 	if (noinfo)
766 		message("504 HELP topic unknown");
767 	else
768 		message("214 End of HELP info");
769 	(void) fclose(hf);
770 }
771 /*
772 **  RUNINCHILD -- return twice -- once in the child, then in the parent again
773 **
774 **	Parameters:
775 **		label -- a string used in error messages
776 **
777 **	Returns:
778 **		zero in the child
779 **		one in the parent
780 **
781 **	Side Effects:
782 **		none.
783 */
784 
785 runinchild(label, e)
786 	char *label;
787 	register ENVELOPE *e;
788 {
789 	int childpid;
790 
791 	if (!OneXact)
792 	{
793 		childpid = dofork();
794 		if (childpid < 0)
795 		{
796 			syserr("%s: cannot fork", label);
797 			return (1);
798 		}
799 		if (childpid > 0)
800 		{
801 			auto int st;
802 
803 			/* parent -- wait for child to complete */
804 			setproctitle("srvrsmtp %s child wait", CurHostName);
805 			st = waitfor(childpid);
806 			if (st == -1)
807 				syserr("%s: lost child", label);
808 
809 			/* if we exited on a QUIT command, complete the process */
810 			if (st == (EX_QUIT << 8))
811 				finis();
812 
813 			return (1);
814 		}
815 		else
816 		{
817 			/* child */
818 			InChild = TRUE;
819 			QuickAbort = FALSE;
820 			clearenvelope(e, FALSE);
821 		}
822 	}
823 
824 	/* open alias database */
825 	initaliases(AliasFile, FALSE, e);
826 
827 	return (0);
828 }
829 
830 # endif /* SMTP */
831