1 /*
2  * Copyright (c) 1983 Eric P. Allman
3  * Copyright (c) 1988, 1993
4  *	The Regents of the University of California.  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	8.3 (Berkeley) 07/13/93 (with SMTP)";
14 #else
15 static char sccsid[] = "@(#)srvrsmtp.c	8.3 (Berkeley) 07/13/93 (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 	int nrcpts;			/* number of RCPT commands */
111 	bool doublequeue;
112 	char inp[MAXLINE];
113 	char cmdbuf[MAXLINE];
114 	extern char Version[];
115 	extern ENVELOPE BlankEnvelope;
116 
117 	if (fileno(OutChannel) != fileno(stdout))
118 	{
119 		/* arrange for debugging output to go to remote host */
120 		(void) dup2(fileno(OutChannel), fileno(stdout));
121 	}
122 	settime(e);
123 	CurHostName = RealHostName;
124 	setproctitle("server %s startup", CurHostName);
125 	expand("\201e", inp, &inp[sizeof inp], e);
126 	message("220-%s", inp);
127 	message("220 ESMTP spoken here");
128 	protocol = NULL;
129 	sendinghost = macvalue('s', e);
130 	gothello = FALSE;
131 	gotmail = FALSE;
132 	for (;;)
133 	{
134 		/* arrange for backout */
135 		if (setjmp(TopFrame) > 0 && InChild)
136 		{
137 			QuickAbort = FALSE;
138 			SuprErrs = TRUE;
139 			finis();
140 		}
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 		SmtpPhase = "server cmd read";
153 		setproctitle("server %s cmd read", CurHostName);
154 		p = sfgets(inp, sizeof inp, InChannel, TimeOuts.to_nextcommand,
155 				SmtpPhase);
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 = "server EHLO";
218 			}
219 			else
220 			{
221 				protocol = "SMTP";
222 				SmtpPhase = "server 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 			gothello = TRUE;
235 			if (c->cmdcode != CMDEHLO)
236 			{
237 				/* print old message and be done with it */
238 				message("250 %s Hello %s, pleased to meet you",
239 					MyHostName, p);
240 				break;
241 			}
242 
243 			/* print extended message and brag */
244 			message("250-%s Hello %s, pleased to meet you",
245 				MyHostName, p);
246 			if (!bitset(PRIV_NOEXPN, PrivacyFlags))
247 				message("250-EXPN");
248 			if (MaxMessageSize > 0)
249 				message("250-SIZE %ld", MaxMessageSize);
250 			else
251 				message("250-SIZE");
252 			message("250 HELP");
253 			break;
254 
255 		  case CMDMAIL:		/* mail -- designate sender */
256 			SmtpPhase = "server MAIL";
257 
258 			/* check for validity of this command */
259 			if (!gothello)
260 			{
261 				/* set sending host to our known value */
262 				if (sendinghost == NULL)
263 					sendinghost = RealHostName;
264 
265 				if (bitset(PRIV_NEEDMAILHELO, PrivacyFlags))
266 				{
267 					message("503 Polite people say HELO first");
268 					break;
269 				}
270 			}
271 			if (gotmail)
272 			{
273 				message("503 Sender already specified");
274 				break;
275 			}
276 			if (InChild)
277 			{
278 				errno = 0;
279 				syserr("503 Nested MAIL command: MAIL %s", p);
280 				finis();
281 			}
282 
283 			/* fork a subprocess to process this command */
284 			if (runinchild("SMTP-MAIL", e) > 0)
285 				break;
286 			if (!gothello)
287 			{
288 				auth_warning(e,
289 					"Host %s didn't use HELO protocol",
290 					RealHostName);
291 			}
292 			if (protocol == NULL)
293 				protocol = "SMTP";
294 			define('r', protocol, e);
295 			define('s', sendinghost, e);
296 			initsys(e);
297 			nrcpts = 0;
298 			setproctitle("%s %s: %s", e->e_id, CurHostName, inp);
299 
300 			/* child -- go do the processing */
301 			p = skipword(p, "from");
302 			if (p == NULL)
303 				break;
304 			if (setjmp(TopFrame) > 0)
305 			{
306 				/* this failed -- undo work */
307 				if (InChild)
308 				{
309 					QuickAbort = FALSE;
310 					SuprErrs = TRUE;
311 					e->e_flags &= ~EF_FATALERRS;
312 					finis();
313 				}
314 				break;
315 			}
316 			QuickAbort = TRUE;
317 
318 			/* must parse sender first */
319 			delimptr = NULL;
320 			setsender(p, e, &delimptr, FALSE);
321 			p = delimptr;
322 			if (p != NULL && *p != '\0')
323 				*p++ = '\0';
324 
325 			/* now parse ESMTP arguments */
326 			msize = 0;
327 			for (; p != NULL && *p != '\0'; p++)
328 			{
329 				char *kp;
330 				char *vp;
331 
332 				/* locate the beginning of the keyword */
333 				while (isascii(*p) && isspace(*p))
334 					p++;
335 				if (*p == '\0')
336 					break;
337 				kp = p;
338 
339 				/* skip to the value portion */
340 				while (isascii(*p) && isalnum(*p) || *p == '-')
341 					p++;
342 				if (*p == '=')
343 				{
344 					*p++ = '\0';
345 					vp = p;
346 
347 					/* skip to the end of the value */
348 					while (*p != '\0' && *p != ' ' &&
349 					       !(isascii(*p) && iscntrl(*p)) &&
350 					       *p != '=')
351 						p++;
352 				}
353 
354 				if (*p != '\0')
355 					*p++ = '\0';
356 
357 				if (tTd(19, 1))
358 					printf("MAIL: got arg %s=%s\n", kp,
359 						vp == NULL ? "<null>" : vp);
360 
361 				if (strcasecmp(kp, "size") == 0)
362 				{
363 					if (vp == NULL)
364 					{
365 						usrerr("501 SIZE requires a value");
366 						/* NOTREACHED */
367 					}
368 					msize = atol(vp);
369 				}
370 				else if (strcasecmp(kp, "body") == 0)
371 				{
372 					if (vp == NULL)
373 					{
374 						usrerr("501 BODY requires a value");
375 						/* NOTREACHED */
376 					}
377 # ifdef MIME
378 					if (strcasecmp(vp, "8bitmime") == 0)
379 					{
380 						e->e_bodytype = "8BITMIME";
381 						SevenBit = FALSE;
382 					}
383 					else if (strcasecmp(vp, "7bit") == 0)
384 					{
385 						e->e_bodytype = "7BIT";
386 						SevenBit = TRUE;
387 					}
388 					else
389 					{
390 						usrerr("501 Unknown BODY type %s",
391 							vp);
392 					}
393 # endif
394 				}
395 				else
396 				{
397 					usrerr("501 %s parameter unrecognized", kp);
398 					/* NOTREACHED */
399 				}
400 			}
401 
402 			if (MaxMessageSize > 0 && msize > MaxMessageSize)
403 			{
404 				usrerr("552 Message size exceeds fixed maximum message size (%ld)",
405 					MaxMessageSize);
406 				/* NOTREACHED */
407 			}
408 
409 			if (!enoughspace(msize))
410 			{
411 				message("452 Insufficient disk space; try again later");
412 				break;
413 			}
414 			message("250 Sender ok");
415 			gotmail = TRUE;
416 			break;
417 
418 		  case CMDRCPT:		/* rcpt -- designate recipient */
419 			if (!gotmail)
420 			{
421 				usrerr("503 Need MAIL before RCPT");
422 				break;
423 			}
424 			SmtpPhase = "server RCPT";
425 			if (setjmp(TopFrame) > 0)
426 			{
427 				e->e_flags &= ~EF_FATALERRS;
428 				break;
429 			}
430 			QuickAbort = TRUE;
431 			LogUsrErrs = TRUE;
432 
433 			if (e->e_sendmode != SM_DELIVER)
434 				e->e_flags |= EF_VRFYONLY;
435 
436 			p = skipword(p, "to");
437 			if (p == NULL)
438 				break;
439 			a = parseaddr(p, (ADDRESS *) NULL, 1, ' ', NULL, e);
440 			if (a == NULL)
441 				break;
442 			a->q_flags |= QPRIMARY;
443 			a = recipient(a, &e->e_sendqueue, e);
444 			if (Errors != 0)
445 				break;
446 
447 			/* no errors during parsing, but might be a duplicate */
448 			e->e_to = p;
449 			if (!bitset(QBADADDR, a->q_flags))
450 			{
451 				message("250 Recipient ok");
452 				nrcpts++;
453 			}
454 			else
455 			{
456 				/* punt -- should keep message in ADDRESS.... */
457 				message("550 Addressee unknown");
458 			}
459 			e->e_to = NULL;
460 			break;
461 
462 		  case CMDDATA:		/* data -- text of mail */
463 			SmtpPhase = "server DATA";
464 			if (!gotmail)
465 			{
466 				message("503 Need MAIL command");
467 				break;
468 			}
469 			else if (e->e_nrcpts <= 0)
470 			{
471 				message("503 Need RCPT (recipient)");
472 				break;
473 			}
474 
475 			/* check to see if we need to re-expand aliases */
476 			/* also reset QBADADDR on already-diagnosted addrs */
477 			doublequeue = FALSE;
478 			for (a = e->e_sendqueue; a != NULL; a = a->q_next)
479 			{
480 				if (bitset(QVERIFIED, a->q_flags))
481 				{
482 					/* need to re-expand aliases */
483 					doublequeue = TRUE;
484 				}
485 				if (bitset(QBADADDR, a->q_flags))
486 				{
487 					/* make this "go away" */
488 					a->q_flags |= QDONTSEND;
489 					a->q_flags &= ~QBADADDR;
490 				}
491 			}
492 
493 			/* collect the text of the message */
494 			SmtpPhase = "collect";
495 			collect(TRUE, doublequeue, e);
496 			e->e_flags &= ~EF_FATALERRS;
497 			if (Errors != 0)
498 				goto abortmessage;
499 
500 			/*
501 			**  Arrange to send to everyone.
502 			**	If sending to multiple people, mail back
503 			**		errors rather than reporting directly.
504 			**	In any case, don't mail back errors for
505 			**		anything that has happened up to
506 			**		now (the other end will do this).
507 			**	Truncate our transcript -- the mail has gotten
508 			**		to us successfully, and if we have
509 			**		to mail this back, it will be easier
510 			**		on the reader.
511 			**	Then send to everyone.
512 			**	Finally give a reply code.  If an error has
513 			**		already been given, don't mail a
514 			**		message back.
515 			**	We goose error returns by clearing error bit.
516 			*/
517 
518 			SmtpPhase = "delivery";
519 			if (nrcpts != 1 && !doublequeue)
520 			{
521 				HoldErrs = TRUE;
522 				e->e_errormode = EM_MAIL;
523 			}
524 			e->e_xfp = freopen(queuename(e, 'x'), "w", e->e_xfp);
525 			id = e->e_id;
526 
527 			/* send to all recipients */
528 			sendall(e, doublequeue ? SM_QUEUE : SM_DEFAULT);
529 			e->e_to = NULL;
530 
531 			/* save statistics */
532 			markstats(e, (ADDRESS *) NULL);
533 
534 			/* issue success if appropriate and reset */
535 			if (Errors == 0 || HoldErrs)
536 				message("250 %s Message accepted for delivery", id);
537 
538 			if (bitset(EF_FATALERRS, e->e_flags) && !HoldErrs)
539 			{
540 				/* avoid sending back an extra message */
541 				e->e_flags &= ~EF_FATALERRS;
542 				e->e_flags |= EF_CLRQUEUE;
543 			}
544 			else
545 			{
546 				/* from now on, we have to operate silently */
547 				HoldErrs = TRUE;
548 				e->e_errormode = EM_MAIL;
549 
550 				/* if we just queued, poke it */
551 				if (doublequeue && e->e_sendmode != SM_QUEUE)
552 				{
553 					unlockqueue(e);
554 					dowork(id, TRUE, TRUE, e);
555 					e->e_id = NULL;
556 				}
557 			}
558 
559   abortmessage:
560 			/* if in a child, pop back to our parent */
561 			if (InChild)
562 				finis();
563 
564 			/* clean up a bit */
565 			gotmail = FALSE;
566 			dropenvelope(e);
567 			CurEnv = e = newenvelope(e, CurEnv);
568 			e->e_flags = BlankEnvelope.e_flags;
569 			break;
570 
571 		  case CMDRSET:		/* rset -- reset state */
572 			message("250 Reset state");
573 			if (InChild)
574 				finis();
575 
576 			/* clean up a bit */
577 			gotmail = FALSE;
578 			dropenvelope(e);
579 			CurEnv = e = newenvelope(e, CurEnv);
580 			break;
581 
582 		  case CMDVRFY:		/* vrfy -- verify address */
583 		  case CMDEXPN:		/* expn -- expand address */
584 			vrfy = c->cmdcode == CMDVRFY;
585 			if (bitset(vrfy ? PRIV_NOVRFY : PRIV_NOEXPN,
586 						PrivacyFlags))
587 			{
588 				if (vrfy)
589 					message("252 Who's to say?");
590 				else
591 					message("502 That's none of your business");
592 				break;
593 			}
594 			else if (!gothello &&
595 				 bitset(vrfy ? PRIV_NEEDVRFYHELO : PRIV_NEEDEXPNHELO,
596 						PrivacyFlags))
597 			{
598 				message("503 I demand that you introduce yourself first");
599 				break;
600 			}
601 			if (runinchild(vrfy ? "SMTP-VRFY" : "SMTP-EXPN", e) > 0)
602 				break;
603 #ifdef LOG
604 			if (LogLevel > 5)
605 				syslog(LOG_INFO, "%s: %s", CurHostName, inp);
606 #endif
607 			vrfyqueue = NULL;
608 			QuickAbort = TRUE;
609 			if (vrfy)
610 				e->e_flags |= EF_VRFYONLY;
611 			while (*p != '\0' && isascii(*p) && isspace(*p))
612 				*p++;
613 			if (*p == '\0')
614 			{
615 				message("501 Argument required");
616 				Errors++;
617 			}
618 			else
619 			{
620 				(void) sendtolist(p, (ADDRESS *) NULL,
621 						  &vrfyqueue, e);
622 			}
623 			if (Errors != 0)
624 			{
625 				if (InChild)
626 					finis();
627 				break;
628 			}
629 			if (vrfyqueue == NULL)
630 			{
631 				message("554 Nothing to %s", vrfy ? "VRFY" : "EXPN");
632 			}
633 			while (vrfyqueue != NULL)
634 			{
635 				register ADDRESS *a = vrfyqueue->q_next;
636 
637 				while (a != NULL && bitset(QDONTSEND|QBADADDR, a->q_flags))
638 					a = a->q_next;
639 
640 				if (!bitset(QDONTSEND|QBADADDR, vrfyqueue->q_flags))
641 					printvrfyaddr(vrfyqueue, a == NULL);
642 				else if (a == NULL)
643 					message("554 Self destructive alias loop");
644 				vrfyqueue = a;
645 			}
646 			if (InChild)
647 				finis();
648 			break;
649 
650 		  case CMDHELP:		/* help -- give user info */
651 			help(p);
652 			break;
653 
654 		  case CMDNOOP:		/* noop -- do nothing */
655 			message("200 OK");
656 			break;
657 
658 		  case CMDQUIT:		/* quit -- leave mail */
659 			message("221 %s closing connection", MyHostName);
660 
661 			/* avoid future 050 messages */
662 			Verbose = FALSE;
663 
664 			if (InChild)
665 				ExitStat = EX_QUIT;
666 			finis();
667 
668 		  case CMDVERB:		/* set verbose mode */
669 			if (bitset(PRIV_NOEXPN, PrivacyFlags))
670 			{
671 				/* this would give out the same info */
672 				message("502 Verbose unavailable");
673 				break;
674 			}
675 			Verbose = TRUE;
676 			e->e_sendmode = SM_DELIVER;
677 			message("250 Verbose mode");
678 			break;
679 
680 		  case CMDONEX:		/* doing one transaction only */
681 			OneXact = TRUE;
682 			message("250 Only one transaction");
683 			break;
684 
685 # ifdef SMTPDEBUG
686 		  case CMDDBGQSHOW:	/* show queues */
687 			printf("Send Queue=");
688 			printaddr(e->e_sendqueue, TRUE);
689 			break;
690 
691 		  case CMDDBGDEBUG:	/* set debug mode */
692 			tTsetup(tTdvect, sizeof tTdvect, "0-99.1");
693 			tTflag(p);
694 			message("200 Debug set");
695 			break;
696 
697 # else /* not SMTPDEBUG */
698 
699 		  case CMDDBGQSHOW:	/* show queues */
700 		  case CMDDBGDEBUG:	/* set debug mode */
701 # ifdef LOG
702 			if (LogLevel > 0)
703 				syslog(LOG_NOTICE,
704 				    "\"%s\" command from %s (%s)",
705 				    c->cmdname, RealHostName,
706 				    anynet_ntoa(&RealHostAddr));
707 # endif
708 			/* FALL THROUGH */
709 # endif /* SMTPDEBUG */
710 
711 		  case CMDERROR:	/* unknown command */
712 			message("500 Command unrecognized");
713 			break;
714 
715 		  default:
716 			errno = 0;
717 			syserr("500 smtp: unknown code %d", c->cmdcode);
718 			break;
719 		}
720 	}
721 }
722 /*
723 **  SKIPWORD -- skip a fixed word.
724 **
725 **	Parameters:
726 **		p -- place to start looking.
727 **		w -- word to skip.
728 **
729 **	Returns:
730 **		p following w.
731 **		NULL on error.
732 **
733 **	Side Effects:
734 **		clobbers the p data area.
735 */
736 
737 static char *
738 skipword(p, w)
739 	register char *p;
740 	char *w;
741 {
742 	register char *q;
743 
744 	/* find beginning of word */
745 	while (isascii(*p) && isspace(*p))
746 		p++;
747 	q = p;
748 
749 	/* find end of word */
750 	while (*p != '\0' && *p != ':' && !(isascii(*p) && isspace(*p)))
751 		p++;
752 	while (isascii(*p) && isspace(*p))
753 		*p++ = '\0';
754 	if (*p != ':')
755 	{
756 	  syntax:
757 		message("501 Syntax error in parameters");
758 		Errors++;
759 		return (NULL);
760 	}
761 	*p++ = '\0';
762 	while (isascii(*p) && isspace(*p))
763 		p++;
764 
765 	if (*p == '\0')
766 		goto syntax;
767 
768 	/* see if the input word matches desired word */
769 	if (strcasecmp(q, w))
770 		goto syntax;
771 
772 	return (p);
773 }
774 /*
775 **  PRINTVRFYADDR -- print an entry in the verify queue
776 **
777 **	Parameters:
778 **		a -- the address to print
779 **		last -- set if this is the last one.
780 **
781 **	Returns:
782 **		none.
783 **
784 **	Side Effects:
785 **		Prints the appropriate 250 codes.
786 */
787 
788 printvrfyaddr(a, last)
789 	register ADDRESS *a;
790 	bool last;
791 {
792 	char fmtbuf[20];
793 
794 	strcpy(fmtbuf, "250");
795 	fmtbuf[3] = last ? ' ' : '-';
796 
797 	if (a->q_fullname == NULL)
798 	{
799 		if (strchr(a->q_user, '@') == NULL)
800 			strcpy(&fmtbuf[4], "<%s@%s>");
801 		else
802 			strcpy(&fmtbuf[4], "<%s>");
803 		message(fmtbuf, a->q_user, MyHostName);
804 	}
805 	else
806 	{
807 		if (strchr(a->q_user, '@') == NULL)
808 			strcpy(&fmtbuf[4], "%s <%s@%s>");
809 		else
810 			strcpy(&fmtbuf[4], "%s <%s>");
811 		message(fmtbuf, a->q_fullname, a->q_user, MyHostName);
812 	}
813 }
814 /*
815 **  HELP -- implement the HELP command.
816 **
817 **	Parameters:
818 **		topic -- the topic we want help for.
819 **
820 **	Returns:
821 **		none.
822 **
823 **	Side Effects:
824 **		outputs the help file to message output.
825 */
826 
827 help(topic)
828 	char *topic;
829 {
830 	register FILE *hf;
831 	int len;
832 	char buf[MAXLINE];
833 	bool noinfo;
834 
835 	if (HelpFile == NULL || (hf = fopen(HelpFile, "r")) == NULL)
836 	{
837 		/* no help */
838 		errno = 0;
839 		message("502 HELP not implemented");
840 		return;
841 	}
842 
843 	if (topic == NULL || *topic == '\0')
844 		topic = "smtp";
845 	else
846 		makelower(topic);
847 
848 	len = strlen(topic);
849 	noinfo = TRUE;
850 
851 	while (fgets(buf, sizeof buf, hf) != NULL)
852 	{
853 		if (strncmp(buf, topic, len) == 0)
854 		{
855 			register char *p;
856 
857 			p = strchr(buf, '\t');
858 			if (p == NULL)
859 				p = buf;
860 			else
861 				p++;
862 			fixcrlf(p, TRUE);
863 			message("214-%s", p);
864 			noinfo = FALSE;
865 		}
866 	}
867 
868 	if (noinfo)
869 		message("504 HELP topic unknown");
870 	else
871 		message("214 End of HELP info");
872 	(void) fclose(hf);
873 }
874 /*
875 **  RUNINCHILD -- return twice -- once in the child, then in the parent again
876 **
877 **	Parameters:
878 **		label -- a string used in error messages
879 **
880 **	Returns:
881 **		zero in the child
882 **		one in the parent
883 **
884 **	Side Effects:
885 **		none.
886 */
887 
888 runinchild(label, e)
889 	char *label;
890 	register ENVELOPE *e;
891 {
892 	int childpid;
893 
894 	if (!OneXact)
895 	{
896 		childpid = dofork();
897 		if (childpid < 0)
898 		{
899 			syserr("%s: cannot fork", label);
900 			return (1);
901 		}
902 		if (childpid > 0)
903 		{
904 			auto int st;
905 
906 			/* parent -- wait for child to complete */
907 			setproctitle("server %s child wait", CurHostName);
908 			st = waitfor(childpid);
909 			if (st == -1)
910 				syserr("%s: lost child", label);
911 
912 			/* if we exited on a QUIT command, complete the process */
913 			if (st == (EX_QUIT << 8))
914 				finis();
915 
916 			return (1);
917 		}
918 		else
919 		{
920 			/* child */
921 			InChild = TRUE;
922 			QuickAbort = FALSE;
923 			clearenvelope(e, FALSE);
924 		}
925 	}
926 
927 	/* open alias database */
928 	initmaps(FALSE, e);
929 
930 	return (0);
931 }
932 
933 # endif /* SMTP */
934