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	6.46 (Berkeley) 04/26/93 (with SMTP)";
14 #else
15 static char sccsid[] = "@(#)srvrsmtp.c	6.46 (Berkeley) 04/26/93 (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 (fileno(OutChannel) != fileno(stdout))
120 	{
121 		/* arrange for debugging output to go to remote host */
122 		(void) dup2(fileno(OutChannel), fileno(stdout));
123 	}
124 	settime(e);
125 	CurHostName = RealHostName;
126 	setproctitle("srvrsmtp %s startup", CurHostName);
127 	expand("\201e", inp, &inp[sizeof inp], e);
128 	message("220 %s", inp);
129 	protocol = NULL;
130 	sendinghost = macvalue('s', e);
131 	gothello = FALSE;
132 	gotmail = FALSE;
133 	for (;;)
134 	{
135 		/* arrange for backout */
136 		if (setjmp(TopFrame) > 0 && InChild)
137 		{
138 			QuickAbort = FALSE;
139 			SuprErrs = TRUE;
140 			finis();
141 		}
142 		QuickAbort = FALSE;
143 		HoldErrs = FALSE;
144 		LogUsrErrs = FALSE;
145 		e->e_flags &= ~EF_VRFYONLY;
146 
147 		/* setup for the read */
148 		e->e_to = NULL;
149 		Errors = 0;
150 		(void) fflush(stdout);
151 
152 		/* read the input line */
153 		SmtpPhase = "srvrsmtp cmd read";
154 		setproctitle("srvrsmtp %s cmd read", CurHostName);
155 		p = sfgets(inp, sizeof inp, InChannel, TimeOuts.to_nextcommand);
156 
157 		/* handle errors */
158 		if (p == NULL)
159 		{
160 			/* end of file, just die */
161 			message("421 %s Lost input channel from %s",
162 				MyHostName, CurHostName);
163 #ifdef LOG
164 			if (LogLevel > 1)
165 				syslog(LOG_NOTICE, "lost input channel from %s",
166 					CurHostName);
167 #endif
168 			if (InChild)
169 				ExitStat = EX_QUIT;
170 			finis();
171 		}
172 
173 		/* clean up end of line */
174 		fixcrlf(inp, TRUE);
175 
176 		/* echo command to transcript */
177 		if (e->e_xfp != NULL)
178 			fprintf(e->e_xfp, "<<< %s\n", inp);
179 
180 		if (e->e_id == NULL)
181 			setproctitle("%s: %s", CurHostName, inp);
182 		else
183 			setproctitle("%s %s: %s", e->e_id, CurHostName, inp);
184 
185 		/* break off command */
186 		for (p = inp; isascii(*p) && isspace(*p); p++)
187 			continue;
188 		cmd = cmdbuf;
189 		while (*p != '\0' &&
190 		       !(isascii(*p) && isspace(*p)) &&
191 		       cmd < &cmdbuf[sizeof cmdbuf - 2])
192 			*cmd++ = *p++;
193 		*cmd = '\0';
194 
195 		/* throw away leading whitespace */
196 		while (isascii(*p) && isspace(*p))
197 			p++;
198 
199 		/* decode command */
200 		for (c = CmdTab; c->cmdname != NULL; c++)
201 		{
202 			if (!strcasecmp(c->cmdname, cmdbuf))
203 				break;
204 		}
205 
206 		/* reset errors */
207 		errno = 0;
208 
209 		/* process command */
210 		switch (c->cmdcode)
211 		{
212 		  case CMDHELO:		/* hello -- introduce yourself */
213 		  case CMDEHLO:		/* extended hello */
214 			if (c->cmdcode == CMDEHLO)
215 			{
216 				protocol = "ESMTP";
217 				SmtpPhase = "EHLO";
218 			}
219 			else
220 			{
221 				protocol = "SMTP";
222 				SmtpPhase = "HELO";
223 			}
224 			sendinghost = newstr(p);
225 			if (strcasecmp(p, RealHostName) != 0)
226 			{
227 				auth_warning(e, "Host %s claimed to be %s",
228 					RealHostName, p);
229 			}
230 			p = macvalue('_', e);
231 			if (p == NULL)
232 				p = RealHostName;
233 
234 			/* send ext. message -- old systems must ignore */
235 			message("250-%s Hello %s, pleased to meet you",
236 				MyHostName, p);
237 			if (!bitset(PRIV_NOEXPN, PrivacyFlags))
238 				message("250-EXPN");
239 			if (MaxMessageSize > 0)
240 				message("250-SIZE %ld", MaxMessageSize);
241 			else
242 				message("250-SIZE");
243 			message("250 HELP");
244 			gothello = TRUE;
245 			break;
246 
247 		  case CMDMAIL:		/* mail -- designate sender */
248 			SmtpPhase = "MAIL";
249 
250 			/* check for validity of this command */
251 			if (!gothello)
252 			{
253 				/* set sending host to our known value */
254 				if (sendinghost == NULL)
255 					sendinghost = RealHostName;
256 
257 				if (bitset(PRIV_NEEDMAILHELO, PrivacyFlags))
258 				{
259 					message("503 Polite people say HELO first");
260 					break;
261 				}
262 				else
263 				{
264 					auth_warning(e,
265 						"Host %s didn't use HELO protocol",
266 						RealHostName);
267 				}
268 			}
269 			if (gotmail)
270 			{
271 				message("503 Sender already specified");
272 				break;
273 			}
274 			if (InChild)
275 			{
276 				errno = 0;
277 				syserr("503 Nested MAIL command: MAIL %s", p);
278 				finis();
279 			}
280 
281 			/* fork a subprocess to process this command */
282 			if (runinchild("SMTP-MAIL", e) > 0)
283 				break;
284 			if (protocol == NULL)
285 				protocol = "SMTP";
286 			define('r', protocol, e);
287 			define('s', sendinghost, e);
288 			initsys(e);
289 			setproctitle("%s %s: %s", e->e_id, CurHostName, inp);
290 
291 			/* child -- go do the processing */
292 			p = skipword(p, "from");
293 			if (p == NULL)
294 				break;
295 			if (setjmp(TopFrame) > 0)
296 			{
297 				/* this failed -- undo work */
298 				if (InChild)
299 				{
300 					QuickAbort = FALSE;
301 					SuprErrs = TRUE;
302 					finis();
303 				}
304 				break;
305 			}
306 			QuickAbort = TRUE;
307 
308 			/* must parse sender first */
309 			delimptr = NULL;
310 			setsender(p, e, &delimptr, FALSE);
311 			p = delimptr;
312 			if (p != NULL && *p != '\0')
313 				*p++ = '\0';
314 
315 			/* now parse ESMTP arguments */
316 			msize = 0;
317 			for (; p != NULL && *p != '\0'; p++)
318 			{
319 				char *kp;
320 				char *vp;
321 
322 				/* locate the beginning of the keyword */
323 				while (isascii(*p) && isspace(*p))
324 					p++;
325 				if (*p == '\0')
326 					break;
327 				kp = p;
328 
329 				/* skip to the value portion */
330 				while (isascii(*p) && isalnum(*p) || *p == '-')
331 					p++;
332 				if (*p == '=')
333 				{
334 					*p++ = '\0';
335 					vp = p;
336 
337 					/* skip to the end of the value */
338 					while (*p != '\0' && *p != ' ' &&
339 					       !(isascii(*p) && iscntrl(*p)) &&
340 					       *p != '=')
341 						p++;
342 				}
343 
344 				if (*p != '\0')
345 					*p++ = '\0';
346 
347 				if (tTd(19, 1))
348 					printf("MAIL: got arg %s=%s\n", kp,
349 						vp == NULL ? "<null>" : vp);
350 
351 				if (strcasecmp(kp, "size") == 0)
352 				{
353 					if (vp == NULL)
354 					{
355 						usrerr("501 SIZE requires a value");
356 						/* NOTREACHED */
357 					}
358 					msize = atol(vp);
359 				}
360 				else if (strcasecmp(kp, "body") == 0)
361 				{
362 					if (vp == NULL)
363 					{
364 						usrerr("501 BODY requires a value");
365 						/* NOTREACHED */
366 					}
367 # ifdef MIME
368 					if (strcasecmp(vp, "8bitmime") == 0)
369 					{
370 						e->e_bodytype = "8BITMIME";
371 						EightBit = TRUE;
372 					}
373 					else if (strcasecmp(vp, "7bit") == 0)
374 					{
375 						e->e_bodytype = "7BIT";
376 						EightBit = FALSE;
377 					}
378 					else
379 					{
380 						usrerr("501 Unknown BODY type %s",
381 							vp);
382 					}
383 # endif
384 				}
385 				else
386 				{
387 					usrerr("501 %s parameter unrecognized", kp);
388 					/* NOTREACHED */
389 				}
390 			}
391 
392 			if (MaxMessageSize > 0 && msize > MaxMessageSize)
393 			{
394 				usrerr("552 Message size exceeds fixed maximum message size (%ld)",
395 					MaxMessageSize);
396 				/* NOTREACHED */
397 			}
398 
399 			if (!enoughspace(msize))
400 			{
401 				message("452 Insufficient disk space; try again later");
402 				break;
403 			}
404 			message("250 Sender ok");
405 			gotmail = TRUE;
406 			break;
407 
408 		  case CMDRCPT:		/* rcpt -- designate recipient */
409 			if (!gotmail)
410 			{
411 				usrerr("503 Need MAIL before RCPT");
412 				break;
413 			}
414 			SmtpPhase = "RCPT";
415 			if (setjmp(TopFrame) > 0)
416 			{
417 				e->e_flags &= ~EF_FATALERRS;
418 				break;
419 			}
420 			QuickAbort = TRUE;
421 			LogUsrErrs = TRUE;
422 
423 			e->e_flags |= EF_VRFYONLY;
424 
425 			p = skipword(p, "to");
426 			if (p == NULL)
427 				break;
428 			a = parseaddr(p, (ADDRESS *) NULL, 1, ' ', NULL, e);
429 			if (a == NULL)
430 				break;
431 			a->q_flags |= QPRIMARY;
432 			a = recipient(a, &e->e_sendqueue, e);
433 			if (Errors != 0)
434 				break;
435 
436 			/* no errors during parsing, but might be a duplicate */
437 			e->e_to = p;
438 			if (!bitset(QBADADDR, a->q_flags))
439 				message("250 Recipient ok");
440 			else
441 			{
442 				/* punt -- should keep message in ADDRESS.... */
443 				message("550 Addressee unknown");
444 			}
445 			e->e_to = NULL;
446 			break;
447 
448 		  case CMDDATA:		/* data -- text of mail */
449 			SmtpPhase = "DATA";
450 			if (!gotmail)
451 			{
452 				message("503 Need MAIL command");
453 				break;
454 			}
455 			else if (e->e_nrcpts <= 0)
456 			{
457 				message("503 Need RCPT (recipient)");
458 				break;
459 			}
460 
461 			/* check to see if we need to re-expand aliases */
462 			for (a = e->e_sendqueue; a != NULL; a = a->q_next)
463 			{
464 				if (bitset(QVERIFIED, a->q_flags))
465 					break;
466 			}
467 
468 			/* collect the text of the message */
469 			SmtpPhase = "collect";
470 			collect(TRUE, a != NULL, e);
471 			if (Errors != 0)
472 				break;
473 
474 			/*
475 			**  Arrange to send to everyone.
476 			**	If sending to multiple people, mail back
477 			**		errors rather than reporting directly.
478 			**	In any case, don't mail back errors for
479 			**		anything that has happened up to
480 			**		now (the other end will do this).
481 			**	Truncate our transcript -- the mail has gotten
482 			**		to us successfully, and if we have
483 			**		to mail this back, it will be easier
484 			**		on the reader.
485 			**	Then send to everyone.
486 			**	Finally give a reply code.  If an error has
487 			**		already been given, don't mail a
488 			**		message back.
489 			**	We goose error returns by clearing error bit.
490 			*/
491 
492 			SmtpPhase = "delivery";
493 			if (e->e_nrcpts != 1)
494 			{
495 				HoldErrs = TRUE;
496 				e->e_errormode = EM_MAIL;
497 			}
498 			e->e_flags &= ~EF_FATALERRS;
499 			e->e_xfp = freopen(queuename(e, 'x'), "w", e->e_xfp);
500 			id = e->e_id;
501 
502 			/* send to all recipients */
503 			sendall(e, a == NULL ? SM_DEFAULT : SM_QUEUE);
504 			e->e_to = NULL;
505 
506 			/* save statistics */
507 			markstats(e, (ADDRESS *) NULL);
508 
509 			/* issue success if appropriate and reset */
510 			if (Errors == 0 || HoldErrs)
511 				message("250 %s Message accepted for delivery", id);
512 			else
513 				e->e_flags &= ~EF_FATALERRS;
514 
515 			/* if we just queued, poke it */
516 			if (a != NULL && e->e_sendmode != SM_QUEUE)
517 			{
518 				unlockqueue(e);
519 				dowork(id, TRUE, TRUE, e);
520 				e->e_id = NULL;
521 			}
522 
523 			/* if in a child, pop back to our parent */
524 			if (InChild)
525 				finis();
526 
527 			/* clean up a bit */
528 			gotmail = FALSE;
529 			dropenvelope(e);
530 			CurEnv = e = newenvelope(e, CurEnv);
531 			e->e_flags = BlankEnvelope.e_flags;
532 			break;
533 
534 		  case CMDRSET:		/* rset -- reset state */
535 			message("250 Reset state");
536 			if (InChild)
537 				finis();
538 
539 			/* clean up a bit */
540 			gotmail = FALSE;
541 			dropenvelope(e);
542 			CurEnv = e = newenvelope(e, CurEnv);
543 			break;
544 
545 		  case CMDVRFY:		/* vrfy -- verify address */
546 		  case CMDEXPN:		/* expn -- expand address */
547 			vrfy = c->cmdcode == CMDVRFY;
548 			if (bitset(vrfy ? PRIV_NOVRFY : PRIV_NOEXPN,
549 						PrivacyFlags))
550 			{
551 				if (vrfy)
552 					message("252 Who's to say?");
553 				else
554 					message("502 That's none of your business");
555 				break;
556 			}
557 			else if (!gothello &&
558 				 bitset(vrfy ? PRIV_NEEDVRFYHELO : PRIV_NEEDEXPNHELO,
559 						PrivacyFlags))
560 			{
561 				message("503 I demand that you introduce yourself first");
562 				break;
563 			}
564 			if (runinchild(vrfy ? "SMTP-VRFY" : "SMTP-EXPN", e) > 0)
565 				break;
566 #ifdef LOG
567 			if (LogLevel > 5)
568 				syslog(LOG_INFO, "%s: %s", CurHostName, inp);
569 #endif
570 			vrfyqueue = NULL;
571 			QuickAbort = TRUE;
572 			if (vrfy)
573 				e->e_flags |= EF_VRFYONLY;
574 			(void) sendtolist(p, (ADDRESS *) NULL, &vrfyqueue, e);
575 			if (Errors != 0)
576 			{
577 				if (InChild)
578 					finis();
579 				break;
580 			}
581 			while (vrfyqueue != NULL)
582 			{
583 				register ADDRESS *a = vrfyqueue->q_next;
584 				char *code;
585 
586 				while (a != NULL && bitset(QDONTSEND|QBADADDR, a->q_flags))
587 					a = a->q_next;
588 
589 				if (!bitset(QDONTSEND|QBADADDR, vrfyqueue->q_flags))
590 					printvrfyaddr(vrfyqueue, a == NULL);
591 				else if (a == NULL)
592 					message("554 Self destructive alias loop");
593 				vrfyqueue = a;
594 			}
595 			if (InChild)
596 				finis();
597 			break;
598 
599 		  case CMDHELP:		/* help -- give user info */
600 			help(p);
601 			break;
602 
603 		  case CMDNOOP:		/* noop -- do nothing */
604 			message("200 OK");
605 			break;
606 
607 		  case CMDQUIT:		/* quit -- leave mail */
608 			message("221 %s closing connection", MyHostName);
609 			if (InChild)
610 				ExitStat = EX_QUIT;
611 			finis();
612 
613 		  case CMDVERB:		/* set verbose mode */
614 			Verbose = TRUE;
615 			e->e_sendmode = SM_DELIVER;
616 			message("200 Verbose mode");
617 			break;
618 
619 		  case CMDONEX:		/* doing one transaction only */
620 			OneXact = TRUE;
621 			message("200 Only one transaction");
622 			break;
623 
624 # ifdef SMTPDEBUG
625 		  case CMDDBGQSHOW:	/* show queues */
626 			printf("Send Queue=");
627 			printaddr(e->e_sendqueue, TRUE);
628 			break;
629 
630 		  case CMDDBGDEBUG:	/* set debug mode */
631 			tTsetup(tTdvect, sizeof tTdvect, "0-99.1");
632 			tTflag(p);
633 			message("200 Debug set");
634 			break;
635 
636 # else /* not SMTPDEBUG */
637 
638 		  case CMDDBGQSHOW:	/* show queues */
639 		  case CMDDBGDEBUG:	/* set debug mode */
640 # ifdef LOG
641 			if (LogLevel > 0)
642 				syslog(LOG_NOTICE,
643 				    "\"%s\" command from %s (%s)",
644 				    c->cmdname, RealHostName,
645 				    anynet_ntoa(&RealHostAddr));
646 # endif
647 			/* FALL THROUGH */
648 # endif /* SMTPDEBUG */
649 
650 		  case CMDERROR:	/* unknown command */
651 			message("500 Command unrecognized");
652 			break;
653 
654 		  default:
655 			errno = 0;
656 			syserr("500 smtp: unknown code %d", c->cmdcode);
657 			break;
658 		}
659 	}
660 }
661 /*
662 **  SKIPWORD -- skip a fixed word.
663 **
664 **	Parameters:
665 **		p -- place to start looking.
666 **		w -- word to skip.
667 **
668 **	Returns:
669 **		p following w.
670 **		NULL on error.
671 **
672 **	Side Effects:
673 **		clobbers the p data area.
674 */
675 
676 static char *
677 skipword(p, w)
678 	register char *p;
679 	char *w;
680 {
681 	register char *q;
682 
683 	/* find beginning of word */
684 	while (isascii(*p) && isspace(*p))
685 		p++;
686 	q = p;
687 
688 	/* find end of word */
689 	while (*p != '\0' && *p != ':' && !(isascii(*p) && isspace(*p)))
690 		p++;
691 	while (isascii(*p) && isspace(*p))
692 		*p++ = '\0';
693 	if (*p != ':')
694 	{
695 	  syntax:
696 		message("501 Syntax error");
697 		Errors++;
698 		return (NULL);
699 	}
700 	*p++ = '\0';
701 	while (isascii(*p) && isspace(*p))
702 		p++;
703 
704 	/* see if the input word matches desired word */
705 	if (strcasecmp(q, w))
706 		goto syntax;
707 
708 	return (p);
709 }
710 /*
711 **  PRINTVRFYADDR -- print an entry in the verify queue
712 **
713 **	Parameters:
714 **		a -- the address to print
715 **		last -- set if this is the last one.
716 **
717 **	Returns:
718 **		none.
719 **
720 **	Side Effects:
721 **		Prints the appropriate 250 codes.
722 */
723 
724 printvrfyaddr(a, last)
725 	register ADDRESS *a;
726 	bool last;
727 {
728 	char fmtbuf[20];
729 
730 	strcpy(fmtbuf, "250");
731 	fmtbuf[3] = last ? ' ' : '-';
732 
733 	if (strchr(a->q_paddr, '<') != NULL)
734 		strcpy(&fmtbuf[4], "%s");
735 	else if (a->q_fullname == NULL)
736 		strcpy(&fmtbuf[4], "<%s>");
737 	else
738 	{
739 		strcpy(&fmtbuf[4], "%s <%s>");
740 		message(fmtbuf, a->q_fullname, a->q_paddr);
741 		return;
742 	}
743 	message(fmtbuf, a->q_paddr);
744 }
745 /*
746 **  HELP -- implement the HELP command.
747 **
748 **	Parameters:
749 **		topic -- the topic we want help for.
750 **
751 **	Returns:
752 **		none.
753 **
754 **	Side Effects:
755 **		outputs the help file to message output.
756 */
757 
758 help(topic)
759 	char *topic;
760 {
761 	register FILE *hf;
762 	int len;
763 	char buf[MAXLINE];
764 	bool noinfo;
765 
766 	if (HelpFile == NULL || (hf = fopen(HelpFile, "r")) == NULL)
767 	{
768 		/* no help */
769 		errno = 0;
770 		message("502 HELP not implemented");
771 		return;
772 	}
773 
774 	if (topic == NULL || *topic == '\0')
775 		topic = "smtp";
776 	else
777 		makelower(topic);
778 
779 	len = strlen(topic);
780 	noinfo = TRUE;
781 
782 	while (fgets(buf, sizeof buf, hf) != NULL)
783 	{
784 		if (strncmp(buf, topic, len) == 0)
785 		{
786 			register char *p;
787 
788 			p = strchr(buf, '\t');
789 			if (p == NULL)
790 				p = buf;
791 			else
792 				p++;
793 			fixcrlf(p, TRUE);
794 			message("214-%s", p);
795 			noinfo = FALSE;
796 		}
797 	}
798 
799 	if (noinfo)
800 		message("504 HELP topic unknown");
801 	else
802 		message("214 End of HELP info");
803 	(void) fclose(hf);
804 }
805 /*
806 **  RUNINCHILD -- return twice -- once in the child, then in the parent again
807 **
808 **	Parameters:
809 **		label -- a string used in error messages
810 **
811 **	Returns:
812 **		zero in the child
813 **		one in the parent
814 **
815 **	Side Effects:
816 **		none.
817 */
818 
819 runinchild(label, e)
820 	char *label;
821 	register ENVELOPE *e;
822 {
823 	int childpid;
824 
825 	if (!OneXact)
826 	{
827 		childpid = dofork();
828 		if (childpid < 0)
829 		{
830 			syserr("%s: cannot fork", label);
831 			return (1);
832 		}
833 		if (childpid > 0)
834 		{
835 			auto int st;
836 
837 			/* parent -- wait for child to complete */
838 			setproctitle("srvrsmtp %s child wait", CurHostName);
839 			st = waitfor(childpid);
840 			if (st == -1)
841 				syserr("%s: lost child", label);
842 
843 			/* if we exited on a QUIT command, complete the process */
844 			if (st == (EX_QUIT << 8))
845 				finis();
846 
847 			return (1);
848 		}
849 		else
850 		{
851 			/* child */
852 			InChild = TRUE;
853 			QuickAbort = FALSE;
854 			clearenvelope(e, FALSE);
855 		}
856 	}
857 
858 	/* open alias database */
859 	initaliases(AliasFile, FALSE, e);
860 
861 	return (0);
862 }
863 
864 # endif /* SMTP */
865