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	6.35 (Berkeley) 03/30/93 (with SMTP)";
14 #else
15 static char sccsid[] = "@(#)srvrsmtp.c	6.35 (Berkeley) 03/30/93 (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 	char *sendinghost;
103 	bool gotmail;			/* mail command received */
104 	bool gothello;			/* helo command received */
105 	bool vrfy;			/* set if this is a vrfy command */
106 	char *protocol;			/* sending protocol */
107 	long msize;			/* approximate maximum message size */
108 	auto char *delimptr;
109 	char *id;
110 	char inp[MAXLINE];
111 	char cmdbuf[MAXLINE];
112 	char hostbuf[MAXNAME];
113 	extern char Version[];
114 	extern char *macvalue();
115 	extern ADDRESS *recipient();
116 	extern ENVELOPE BlankEnvelope;
117 	extern ENVELOPE *newenvelope();
118 	extern char *anynet_ntoa();
119 
120 	if (OutChannel != stdout)
121 	{
122 		/* arrange for debugging output to go to remote host */
123 		(void) close(1);
124 		(void) dup(fileno(OutChannel));
125 	}
126 	settime(e);
127 	CurHostName = RealHostName;
128 	setproctitle("srvrsmtp %s", CurHostName);
129 	expand("\201e", inp, &inp[sizeof inp], e);
130 	message("220 %s", inp);
131 	SmtpPhase = "startup";
132 	sendinghost = NULL;
133 	protocol = NULL;
134 	gothello = FALSE;
135 	gotmail = FALSE;
136 	for (;;)
137 	{
138 		/* arrange for backout */
139 		if (setjmp(TopFrame) > 0 && InChild)
140 			finis();
141 		QuickAbort = FALSE;
142 		HoldErrs = FALSE;
143 		LogUsrErrs = FALSE;
144 		e->e_flags &= ~EF_VRFYONLY;
145 
146 		/* setup for the read */
147 		e->e_to = NULL;
148 		Errors = 0;
149 		(void) fflush(stdout);
150 
151 		/* read the input line */
152 		p = sfgets(inp, sizeof inp, InChannel, TimeOuts.to_nextcommand);
153 
154 		/* handle errors */
155 		if (p == NULL)
156 		{
157 			/* end of file, just die */
158 			message("421 %s Lost input channel from %s",
159 				MyHostName, CurHostName);
160 #ifdef LOG
161 			if (LogLevel > 1)
162 				syslog(LOG_NOTICE, "lost input channel from %s",
163 					CurHostName);
164 #endif
165 			if (InChild)
166 				ExitStat = EX_QUIT;
167 			finis();
168 		}
169 
170 		/* clean up end of line */
171 		fixcrlf(inp, TRUE);
172 
173 		/* echo command to transcript */
174 		if (e->e_xfp != NULL)
175 			fprintf(e->e_xfp, "<<< %s\n", inp);
176 
177 		/* break off command */
178 		for (p = inp; isascii(*p) && isspace(*p); p++)
179 			continue;
180 		cmd = cmdbuf;
181 		while (*p != '\0' &&
182 		       !(isascii(*p) && isspace(*p)) &&
183 		       cmd < &cmdbuf[sizeof cmdbuf - 2])
184 			*cmd++ = *p++;
185 		*cmd = '\0';
186 
187 		/* throw away leading whitespace */
188 		while (isascii(*p) && isspace(*p))
189 			p++;
190 
191 		/* decode command */
192 		for (c = CmdTab; c->cmdname != NULL; c++)
193 		{
194 			if (!strcasecmp(c->cmdname, cmdbuf))
195 				break;
196 		}
197 
198 		/* reset errors */
199 		errno = 0;
200 
201 		/* process command */
202 		switch (c->cmdcode)
203 		{
204 		  case CMDHELO:		/* hello -- introduce yourself */
205 		  case CMDEHLO:		/* extended hello */
206 			if (c->cmdcode == CMDEHLO)
207 			{
208 				protocol = "ESMTP";
209 				SmtpPhase = "EHLO";
210 			}
211 			else
212 			{
213 				protocol = "SMTP";
214 				SmtpPhase = "HELO";
215 			}
216 			setproctitle("%s: %s", CurHostName, inp);
217 			if (strcasecmp(p, MyHostName) == 0)
218 			{
219 				/*
220 				**  Didn't know about alias or MX,
221 				**  or connected to an echo server
222 				*/
223 
224 				message("553 %s config error: mail loops back to myself",
225 					MyHostName);
226 				break;
227 			}
228 			(void) strcpy(hostbuf, p);
229 			(void) strcat(hostbuf, " (");
230 			(void) strcat(hostbuf, anynet_ntoa(&RealHostAddr));
231 			if (strcasecmp(p, RealHostName) != 0)
232 			{
233 				auth_warning(e, "Host %s claimed to be %s",
234 					RealHostName, p);
235 				(void) strcat(hostbuf, "; ");
236 				(void) strcat(hostbuf, RealHostName);
237 			}
238 			(void) strcat(hostbuf, ")");
239 			sendinghost = newstr(hostbuf);
240 
241 			/* send ext. message -- old systems must ignore */
242 			message("250-%s Hello %s, pleased to meet you",
243 				MyHostName, sendinghost);
244 			if (!bitset(PRIV_NOEXPN, PrivacyFlags))
245 				message("250-EXPN");
246 			message("250-SIZE");
247 			message("250 HELP");
248 			gothello = TRUE;
249 			break;
250 
251 		  case CMDMAIL:		/* mail -- designate sender */
252 			SmtpPhase = "MAIL";
253 
254 			/* force a sending host even if no HELO given */
255 			if (sendinghost == NULL && macvalue('s', e) == NULL)
256 				sendinghost = RealHostName;
257 
258 			/* check for validity of this command */
259 			if (!gothello)
260 			{
261 				if (bitset(PRIV_NEEDMAILHELO, PrivacyFlags))
262 				{
263 					message("503 Polite people say HELO first");
264 					break;
265 				}
266 				else
267 				{
268 					auth_warning(e,
269 						"Host %s didn't use HELO protocol",
270 						RealHostName);
271 				}
272 			}
273 			if (gotmail)
274 			{
275 				message("503 Sender already specified");
276 				break;
277 			}
278 			if (InChild)
279 			{
280 				errno = 0;
281 				syserr("503 Nested MAIL command: MAIL %s", p);
282 				finis();
283 			}
284 
285 			/* fork a subprocess to process this command */
286 			if (runinchild("SMTP-MAIL", e) > 0)
287 				break;
288 			if (sendinghost != NULL)
289 				define('s', sendinghost, e);
290 			if (protocol == NULL)
291 				protocol = "SMTP";
292 			define('r', protocol, e);
293 			initsys(e);
294 			setproctitle("%s %s: %s", e->e_id, CurHostName, inp);
295 
296 			/* child -- go do the processing */
297 			p = skipword(p, "from");
298 			if (p == NULL)
299 				break;
300 			if (setjmp(TopFrame) > 0)
301 			{
302 				/* this failed -- undo work */
303 				if (InChild)
304 					finis();
305 				break;
306 			}
307 			QuickAbort = TRUE;
308 
309 			/* must parse sender first */
310 			delimptr = NULL;
311 			setsender(p, e, &delimptr, FALSE);
312 			p = delimptr;
313 			if (p != NULL && *p != '\0')
314 				*p++ = '\0';
315 
316 			/* now parse ESMTP arguments */
317 			msize = 0;
318 			for (; p != NULL && *p != '\0'; p++)
319 			{
320 				char *kp;
321 				char *vp;
322 
323 				/* locate the beginning of the keyword */
324 				while (isascii(*p) && isspace(*p))
325 					p++;
326 				if (*p == '\0')
327 					break;
328 				kp = p;
329 
330 				/* skip to the value portion */
331 				while (isascii(*p) && isalnum(*p) || *p == '-')
332 					p++;
333 				if (*p == '=')
334 				{
335 					*p++ = '\0';
336 					vp = p;
337 
338 					/* skip to the end of the value */
339 					while (*p != '\0' && *p != ' ' &&
340 					       !(isascii(*p) && iscntrl(*p)) &&
341 					       *p != '=')
342 						p++;
343 				}
344 
345 				if (*p != '\0')
346 					*p++ = '\0';
347 
348 				if (tTd(19, 1))
349 					printf("MAIL: got arg %s=%s\n", kp,
350 						vp == NULL ? "<null>" : vp);
351 
352 				if (strcasecmp(kp, "size") == 0)
353 				{
354 					if (kp == NULL)
355 					{
356 						usrerr("501 SIZE requires a value");
357 						/* NOTREACHED */
358 					}
359 					msize = atol(vp);
360 				}
361 				else
362 				{
363 					usrerr("501 %s parameter unrecognized", kp);
364 					/* NOTREACHED */
365 				}
366 			}
367 
368 			if (!enoughspace(msize))
369 			{
370 				message("452 Insufficient disk space; try again later");
371 				break;
372 			}
373 			message("250 Sender ok");
374 			gotmail = TRUE;
375 			break;
376 
377 		  case CMDRCPT:		/* rcpt -- designate recipient */
378 			if (!gotmail)
379 			{
380 				usrerr("503 Need MAIL before RCPT");
381 				break;
382 			}
383 			SmtpPhase = "RCPT";
384 			setproctitle("%s %s: %s", e->e_id, CurHostName, inp);
385 			if (setjmp(TopFrame) > 0)
386 			{
387 				e->e_flags &= ~EF_FATALERRS;
388 				break;
389 			}
390 			QuickAbort = TRUE;
391 			LogUsrErrs = TRUE;
392 
393 			/* optimization -- if queueing, don't expand aliases */
394 			if (e->e_sendmode == SM_QUEUE)
395 				e->e_flags |= EF_VRFYONLY;
396 
397 			p = skipword(p, "to");
398 			if (p == NULL)
399 				break;
400 			a = parseaddr(p, (ADDRESS *) NULL, 1, ' ', NULL, e);
401 			if (a == NULL)
402 				break;
403 			a->q_flags |= QPRIMARY;
404 			a = recipient(a, &e->e_sendqueue, e);
405 			if (Errors != 0)
406 				break;
407 
408 			/* no errors during parsing, but might be a duplicate */
409 			e->e_to = p;
410 			if (!bitset(QBADADDR, a->q_flags))
411 				message("250 Recipient ok");
412 			else
413 			{
414 				/* punt -- should keep message in ADDRESS.... */
415 				message("550 Addressee unknown");
416 			}
417 			e->e_to = NULL;
418 			break;
419 
420 		  case CMDDATA:		/* data -- text of mail */
421 			SmtpPhase = "DATA";
422 			if (!gotmail)
423 			{
424 				message("503 Need MAIL command");
425 				break;
426 			}
427 			else if (e->e_nrcpts <= 0)
428 			{
429 				message("503 Need RCPT (recipient)");
430 				break;
431 			}
432 
433 			/* collect the text of the message */
434 			SmtpPhase = "collect";
435 			setproctitle("%s %s: %s", e->e_id, CurHostName, inp);
436 			collect(TRUE, 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, SM_DEFAULT);
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 in a child, pop back to our parent */
482 			if (InChild)
483 				finis();
484 
485 			/* clean up a bit */
486 			gotmail = FALSE;
487 			dropenvelope(e);
488 			CurEnv = e = newenvelope(e, CurEnv);
489 			e->e_flags = BlankEnvelope.e_flags;
490 			break;
491 
492 		  case CMDRSET:		/* rset -- reset state */
493 			message("250 Reset state");
494 			if (InChild)
495 				finis();
496 
497 			/* clean up a bit */
498 			gotmail = FALSE;
499 			dropenvelope(e);
500 			CurEnv = e = newenvelope(e, CurEnv);
501 			break;
502 
503 		  case CMDVRFY:		/* vrfy -- verify address */
504 		  case CMDEXPN:		/* expn -- expand address */
505 			vrfy = c->cmdcode == CMDVRFY;
506 			if (bitset(vrfy ? PRIV_NOVRFY : PRIV_NOEXPN,
507 						PrivacyFlags))
508 			{
509 				if (vrfy)
510 					message("252 Who's to say?");
511 				else
512 					message("502 That's none of your business");
513 				break;
514 			}
515 			else if (!gothello &&
516 				 bitset(vrfy ? PRIV_NEEDVRFYHELO : PRIV_NEEDEXPNHELO,
517 						PrivacyFlags))
518 			{
519 				message("503 I demand that you introduce yourself first");
520 				break;
521 			}
522 			if (runinchild(vrfy ? "SMTP-VRFY" : "SMTP-EXPN", e) > 0)
523 				break;
524 			setproctitle("%s: %s", CurHostName, inp);
525 #ifdef LOG
526 			if (LogLevel > 5)
527 				syslog(LOG_INFO, "%s: %s", CurHostName, inp);
528 #endif
529 			vrfyqueue = NULL;
530 			QuickAbort = TRUE;
531 			if (vrfy)
532 				e->e_flags |= EF_VRFYONLY;
533 			(void) sendtolist(p, (ADDRESS *) NULL, &vrfyqueue, e);
534 			if (Errors != 0)
535 			{
536 				if (InChild)
537 					finis();
538 				break;
539 			}
540 			while (vrfyqueue != NULL)
541 			{
542 				register ADDRESS *a = vrfyqueue->q_next;
543 				char *code;
544 
545 				while (a != NULL && bitset(QDONTSEND|QBADADDR, a->q_flags))
546 					a = a->q_next;
547 
548 				if (!bitset(QDONTSEND|QBADADDR, vrfyqueue->q_flags))
549 					printvrfyaddr(vrfyqueue, a == NULL);
550 				else if (a == NULL)
551 					message("554 Self destructive alias loop");
552 				vrfyqueue = a;
553 			}
554 			if (InChild)
555 				finis();
556 			break;
557 
558 		  case CMDHELP:		/* help -- give user info */
559 			help(p);
560 			break;
561 
562 		  case CMDNOOP:		/* noop -- do nothing */
563 			message("200 OK");
564 			break;
565 
566 		  case CMDQUIT:		/* quit -- leave mail */
567 			message("221 %s closing connection", MyHostName);
568 			if (InChild)
569 				ExitStat = EX_QUIT;
570 			finis();
571 
572 		  case CMDVERB:		/* set verbose mode */
573 			Verbose = TRUE;
574 			e->e_sendmode = SM_DELIVER;
575 			message("200 Verbose mode");
576 			break;
577 
578 		  case CMDONEX:		/* doing one transaction only */
579 			OneXact = TRUE;
580 			message("200 Only one transaction");
581 			break;
582 
583 # ifdef SMTPDEBUG
584 		  case CMDDBGQSHOW:	/* show queues */
585 			printf("Send Queue=");
586 			printaddr(e->e_sendqueue, TRUE);
587 			break;
588 
589 		  case CMDDBGDEBUG:	/* set debug mode */
590 			tTsetup(tTdvect, sizeof tTdvect, "0-99.1");
591 			tTflag(p);
592 			message("200 Debug set");
593 			break;
594 
595 # else /* not SMTPDEBUG */
596 
597 		  case CMDDBGQSHOW:	/* show queues */
598 		  case CMDDBGDEBUG:	/* set debug mode */
599 # ifdef LOG
600 			if (LogLevel > 0)
601 				syslog(LOG_NOTICE,
602 				    "\"%s\" command from %s (%s)",
603 				    c->cmdname, RealHostName,
604 				    anynet_ntoa(&RealHostAddr));
605 # endif
606 			/* FALL THROUGH */
607 # endif /* SMTPDEBUG */
608 
609 		  case CMDERROR:	/* unknown command */
610 			message("500 Command unrecognized");
611 			break;
612 
613 		  default:
614 			errno = 0;
615 			syserr("500 smtp: unknown code %d", c->cmdcode);
616 			break;
617 		}
618 	}
619 }
620 /*
621 **  SKIPWORD -- skip a fixed word.
622 **
623 **	Parameters:
624 **		p -- place to start looking.
625 **		w -- word to skip.
626 **
627 **	Returns:
628 **		p following w.
629 **		NULL on error.
630 **
631 **	Side Effects:
632 **		clobbers the p data area.
633 */
634 
635 static char *
636 skipword(p, w)
637 	register char *p;
638 	char *w;
639 {
640 	register char *q;
641 
642 	/* find beginning of word */
643 	while (isascii(*p) && isspace(*p))
644 		p++;
645 	q = p;
646 
647 	/* find end of word */
648 	while (*p != '\0' && *p != ':' && !(isascii(*p) && isspace(*p)))
649 		p++;
650 	while (isascii(*p) && isspace(*p))
651 		*p++ = '\0';
652 	if (*p != ':')
653 	{
654 	  syntax:
655 		message("501 Syntax error");
656 		Errors++;
657 		return (NULL);
658 	}
659 	*p++ = '\0';
660 	while (isascii(*p) && isspace(*p))
661 		p++;
662 
663 	/* see if the input word matches desired word */
664 	if (strcasecmp(q, w))
665 		goto syntax;
666 
667 	return (p);
668 }
669 /*
670 **  PRINTVRFYADDR -- print an entry in the verify queue
671 **
672 **	Parameters:
673 **		a -- the address to print
674 **		last -- set if this is the last one.
675 **
676 **	Returns:
677 **		none.
678 **
679 **	Side Effects:
680 **		Prints the appropriate 250 codes.
681 */
682 
683 printvrfyaddr(a, last)
684 	register ADDRESS *a;
685 	bool last;
686 {
687 	char fmtbuf[20];
688 
689 	strcpy(fmtbuf, "250");
690 	fmtbuf[3] = last ? ' ' : '-';
691 
692 	if (strchr(a->q_paddr, '<') != NULL)
693 		strcpy(&fmtbuf[4], "%s");
694 	else if (a->q_fullname == NULL)
695 		strcpy(&fmtbuf[4], "<%s>");
696 	else
697 	{
698 		strcpy(&fmtbuf[4], "%s <%s>");
699 		message(fmtbuf, a->q_fullname, a->q_paddr);
700 		return;
701 	}
702 	message(fmtbuf, a->q_paddr);
703 }
704 /*
705 **  HELP -- implement the HELP command.
706 **
707 **	Parameters:
708 **		topic -- the topic we want help for.
709 **
710 **	Returns:
711 **		none.
712 **
713 **	Side Effects:
714 **		outputs the help file to message output.
715 */
716 
717 help(topic)
718 	char *topic;
719 {
720 	register FILE *hf;
721 	int len;
722 	char buf[MAXLINE];
723 	bool noinfo;
724 
725 	if (HelpFile == NULL || (hf = fopen(HelpFile, "r")) == NULL)
726 	{
727 		/* no help */
728 		errno = 0;
729 		message("502 HELP not implemented");
730 		return;
731 	}
732 
733 	if (topic == NULL || *topic == '\0')
734 		topic = "smtp";
735 	else
736 		makelower(topic);
737 
738 	len = strlen(topic);
739 	noinfo = TRUE;
740 
741 	while (fgets(buf, sizeof buf, hf) != NULL)
742 	{
743 		if (strncmp(buf, topic, len) == 0)
744 		{
745 			register char *p;
746 
747 			p = strchr(buf, '\t');
748 			if (p == NULL)
749 				p = buf;
750 			else
751 				p++;
752 			fixcrlf(p, TRUE);
753 			message("214-%s", p);
754 			noinfo = FALSE;
755 		}
756 	}
757 
758 	if (noinfo)
759 		message("504 HELP topic unknown");
760 	else
761 		message("214 End of HELP info");
762 	(void) fclose(hf);
763 }
764 /*
765 **  RUNINCHILD -- return twice -- once in the child, then in the parent again
766 **
767 **	Parameters:
768 **		label -- a string used in error messages
769 **
770 **	Returns:
771 **		zero in the child
772 **		one in the parent
773 **
774 **	Side Effects:
775 **		none.
776 */
777 
778 runinchild(label, e)
779 	char *label;
780 	register ENVELOPE *e;
781 {
782 	int childpid;
783 
784 	if (!OneXact)
785 	{
786 		childpid = dofork();
787 		if (childpid < 0)
788 		{
789 			syserr("%s: cannot fork", label);
790 			return (1);
791 		}
792 		if (childpid > 0)
793 		{
794 			auto int st;
795 
796 			/* parent -- wait for child to complete */
797 			st = waitfor(childpid);
798 			if (st == -1)
799 				syserr("%s: lost child", label);
800 
801 			/* if we exited on a QUIT command, complete the process */
802 			if (st == (EX_QUIT << 8))
803 				finis();
804 
805 			return (1);
806 		}
807 		else
808 		{
809 			/* child */
810 			InChild = TRUE;
811 			QuickAbort = FALSE;
812 			clearenvelope(e, FALSE);
813 		}
814 	}
815 
816 	/* open alias database */
817 	initaliases(AliasFile, FALSE, e);
818 
819 	return (0);
820 }
821 
822 # endif /* SMTP */
823