xref: /csrg-svn/usr.sbin/sendmail/src/deliver.c (revision 69476)

/*
 * Copyright (c) 1983, 1995 Eric P. Allman
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)deliver.c	8.150 (Berkeley) 05/15/95";
#endif /* not lint */

#include "sendmail.h"
#include <errno.h>
#if NAMED_BIND
#include <resolv.h>

extern int	h_errno;
#endif

extern char	SmtpError[];

/*
**  SENDALL -- actually send all the messages.
**
**	Parameters:
**		e -- the envelope to send.
**		mode -- the delivery mode to use.  If SM_DEFAULT, use
**			the current e->e_sendmode.
**
**	Returns:
**		none.
**
**	Side Effects:
**		Scans the send lists and sends everything it finds.
**		Delivers any appropriate error messages.
**		If we are running in a non-interactive mode, takes the
**			appropriate action.
*/

void
sendall(e, mode)
	ENVELOPE *e;
	char mode;
{
	register ADDRESS *q;
	char *owner;
	int otherowners;
	register ENVELOPE *ee;
	ENVELOPE *splitenv = NULL;
	bool oldverbose = Verbose;
	bool somedeliveries = FALSE;
	int pid;
	extern void sendenvelope();

	/*
	**  If we have had global, fatal errors, don't bother sending
	**  the message at all if we are in SMTP mode.  Local errors
	**  (e.g., a single address failing) will still cause the other
	**  addresses to be sent.
	*/

	if (bitset(EF_FATALERRS, e->e_flags) &&
	    (OpMode == MD_SMTP || OpMode == MD_DAEMON))
	{
		e->e_flags |= EF_CLRQUEUE;
		return;
	}

	/* determine actual delivery mode */
	CurrentLA = getla();
	if (mode == SM_DEFAULT)
	{
		mode = e->e_sendmode;
		if (mode != SM_VERIFY &&
		    shouldqueue(e->e_msgpriority, e->e_ctime))
			mode = SM_QUEUE;
	}

	if (tTd(13, 1))
	{
		extern void printenvflags();

		printf("\n===== SENDALL: mode %c, id %s, e_from ",
			mode, e->e_id);
		printaddr(&e->e_from, FALSE);
		printf("\te_flags = ");
		printenvflags(e);
		printf("sendqueue:\n");
		printaddr(e->e_sendqueue, TRUE);
	}

	/*
	**  Do any preprocessing necessary for the mode we are running.
	**	Check to make sure the hop count is reasonable.
	**	Delete sends to the sender in mailing lists.
	*/

	CurEnv = e;

	if (e->e_hopcount > MaxHopCount)
	{
		errno = 0;
		queueup(e, TRUE, mode == SM_QUEUE);
		e->e_flags |= EF_FATALERRS|EF_PM_NOTIFY|EF_CLRQUEUE;
		syserr("554 Too many hops %d (%d max): from %s via %s, to %s",
			e->e_hopcount, MaxHopCount, e->e_from.q_paddr,
			RealHostName == NULL ? "localhost" : RealHostName,
			e->e_sendqueue->q_paddr);
		e->e_sendqueue->q_status = "5.4.6";
		return;
	}

	/*
	**  Do sender deletion.
	**
	**	If the sender has the QQUEUEUP flag set, skip this.
	**	This can happen if the name server is hosed when you
	**	are trying to send mail.  The result is that the sender
	**	is instantiated in the queue as a recipient.
	*/

	if (!bitset(EF_METOO, e->e_flags) &&
	    !bitset(QQUEUEUP, e->e_from.q_flags))
	{
		if (tTd(13, 5))
		{
			printf("sendall: QDONTSEND ");
			printaddr(&e->e_from, FALSE);
		}
		e->e_from.q_flags |= QDONTSEND;
		(void) recipient(&e->e_from, &e->e_sendqueue, 0, e);
	}

	/*
	**  Handle alias owners.
	**
	**	We scan up the q_alias chain looking for owners.
	**	We discard owners that are the same as the return path.
	*/

	for (q = e->e_sendqueue; q != NULL; q = q->q_next)
	{
		register struct address *a;

		for (a = q; a != NULL && a->q_owner == NULL; a = a->q_alias)
			continue;
		if (a != NULL)
			q->q_owner = a->q_owner;

		if (q->q_owner != NULL &&
		    !bitset(QDONTSEND, q->q_flags) &&
		    strcmp(q->q_owner, e->e_from.q_paddr) == 0)
			q->q_owner = NULL;
	}

	owner = "";
	otherowners = 1;
	while (owner != NULL && otherowners > 0)
	{
		owner = NULL;
		otherowners = 0;

		for (q = e->e_sendqueue; q != NULL; q = q->q_next)
		{
			if (bitset(QDONTSEND, q->q_flags))
				continue;

			if (q->q_owner != NULL)
			{
				if (owner == NULL)
					owner = q->q_owner;
				else if (owner != q->q_owner)
				{
					if (strcmp(owner, q->q_owner) == 0)
					{
						/* make future comparisons cheap */
						q->q_owner = owner;
					}
					else
					{
						otherowners++;
					}
					owner = q->q_owner;
				}
			}
			else
			{
				otherowners++;
			}

			/*
			**  If this mailer is expensive, and if we don't
			**  want to make connections now, just mark these
			**  addresses and return.  This is useful if we
			**  want to batch connections to reduce load.  This
			**  will cause the messages to be queued up, and a
			**  daemon will come along to send the messages later.
			*/

			if (bitset(QBADADDR|QQUEUEUP, q->q_flags))
				continue;
			if (NoConnect && !Verbose &&
			    bitnset(M_EXPENSIVE, q->q_mailer->m_flags))
			{
				q->q_flags |= QQUEUEUP;
				e->e_to = q->q_paddr;
				message("queued");
				if (LogLevel > 8)
					logdelivery(q->q_mailer, NULL,
						    "queued", NULL,
						    (time_t) 0, e);
				e->e_to = NULL;
			}
			else
			{
				somedeliveries = TRUE;
			}
		}

		if (owner != NULL && otherowners > 0)
		{
			extern HDR *copyheader();
			extern ADDRESS *copyqueue();

			/*
			**  Split this envelope into two.
			*/

			ee = (ENVELOPE *) xalloc(sizeof(ENVELOPE));
			*ee = *e;
			ee->e_id = NULL;
			(void) queuename(ee, '\0');

			if (tTd(13, 1))
				printf("sendall: split %s into %s\n",
					e->e_id, ee->e_id);

			ee->e_header = copyheader(e->e_header);
			ee->e_sendqueue = copyqueue(e->e_sendqueue);
			ee->e_errorqueue = copyqueue(e->e_errorqueue);
			ee->e_flags = e->e_flags & ~(EF_INQUEUE|EF_CLRQUEUE|EF_FATALERRS|EF_SENDRECEIPT|EF_RET_PARAM);
			ee->e_flags |= EF_NORECEIPT;
			setsender(owner, ee, NULL, TRUE);
			if (tTd(13, 5))
			{
				printf("sendall(split): QDONTSEND ");
				printaddr(&ee->e_from, FALSE);
			}
			ee->e_from.q_flags |= QDONTSEND;
			ee->e_dfp = NULL;
			ee->e_xfp = NULL;
			ee->e_errormode = EM_MAIL;
			ee->e_sibling = splitenv;
			splitenv = ee;

			for (q = e->e_sendqueue; q != NULL; q = q->q_next)
			{
				if (q->q_owner == owner)
				{
					q->q_flags |= QDONTSEND;
					q->q_flags &= ~QQUEUEUP;
				}
			}
			for (q = ee->e_sendqueue; q != NULL; q = q->q_next)
			{
				if (q->q_owner != owner)
				{
					q->q_flags |= QDONTSEND;
					q->q_flags &= ~QQUEUEUP;
				}
				else
				{
					/* clear DSN parameters */
					q->q_flags &= ~(QHASNOTIFY|QPINGONSUCCESS);
					q->q_flags |= QPINGONFAILURE|QPINGONDELAY;
				}
			}

			if (mode != SM_VERIFY && bitset(EF_HAS_DF, e->e_flags))
			{
				char df1buf[20], df2buf[20];

				ee->e_dfp = NULL;
				strcpy(df1buf, queuename(e, 'd'));
				strcpy(df2buf, queuename(ee, 'd'));
				if (link(df1buf, df2buf) < 0)
				{
					syserr("sendall: link(%s, %s)",
						df1buf, df2buf);
				}
			}
#ifdef LOG
			if (LogLevel > 4)
				syslog(LOG_INFO, "%s: clone %s, owner=%s",
					ee->e_id, e->e_id, owner);
#endif
		}
	}

	if (owner != NULL)
	{
		setsender(owner, e, NULL, TRUE);
		if (tTd(13, 5))
		{
			printf("sendall(owner): QDONTSEND ");
			printaddr(&e->e_from, FALSE);
		}
		e->e_from.q_flags |= QDONTSEND;
		e->e_errormode = EM_MAIL;
		e->e_flags |= EF_NORECEIPT;
	}

	/* if nothing to be delivered, just queue up everything */
	if (!somedeliveries && mode != SM_QUEUE && mode != SM_VERIFY)
		mode = SM_QUEUE;

# ifdef QUEUE
	if ((mode == SM_QUEUE || mode == SM_FORK ||
	     (mode != SM_VERIFY && SuperSafe)) &&
	    !bitset(EF_INQUEUE, e->e_flags))
	{
		/* be sure everything is instantiated in the queue */
		queueup(e, TRUE, mode == SM_QUEUE);
		for (ee = splitenv; ee != NULL; ee = ee->e_sibling)
			queueup(ee, TRUE, mode == SM_QUEUE);
	}
#endif /* QUEUE */

	/*
	**  If we belong in background, fork now.
	*/

	switch (mode)
	{
	  case SM_VERIFY:
		Verbose = TRUE;
		break;

	  case SM_QUEUE:
  queueonly:
		if (e->e_nrcpts > 0)
			e->e_flags |= EF_INQUEUE|EF_KEEPQUEUE;
		return;

	  case SM_FORK:
		if (e->e_xfp != NULL)
			(void) fflush(e->e_xfp);

# if !HASFLOCK
		/*
		**  Since fcntl locking has the interesting semantic that
		**  the lock is owned by a process, not by an open file
		**  descriptor, we have to flush this to the queue, and
		**  then restart from scratch in the child.
		*/

		{
			/* save id for future use */
			char *qid = e->e_id;

			/* now drop the envelope in the parent */
			e->e_flags |= EF_INQUEUE|EF_KEEPQUEUE;
			dropenvelope(e);

			/* and reacquire in the child */
			(void) dowork(qid, TRUE, FALSE, e);
		}

		return;

# else /* HASFLOCK */

		pid = fork();
		if (pid < 0)
		{
			goto queueonly;
		}
		else if (pid > 0)
		{
			/* be sure we leave the temp files to our child */
			/* can't call unlockqueue to avoid unlink of xfp */
			if (e->e_lockfp != NULL)
				(void) xfclose(e->e_lockfp, "sendenvelope lockfp", e->e_id);
			e->e_lockfp = NULL;

			/* close any random open files in the envelope */
			closexscript(e);
			if (e->e_dfp != NULL)
				(void) xfclose(e->e_dfp, "sendenvelope dfp", e->e_id);
			e->e_dfp = NULL;
			e->e_id = NULL;
			e->e_flags &= ~EF_HAS_DF;

			/* catch intermediate zombie */
			(void) waitfor(pid);
			return;
		}

		/* double fork to avoid zombies */
		pid = fork();
		if (pid > 0)
			exit(EX_OK);

		/* be sure we are immune from the terminal */
		disconnect(1, e);

		/* prevent parent from waiting if there was an error */
		if (pid < 0)
		{
			e->e_flags |= EF_INQUEUE|EF_KEEPQUEUE;
			finis();
		}

		/*
		**  Close any cached connections.
		**
		**	We don't send the QUIT protocol because the parent
		**	still knows about the connection.
		**
		**	This should only happen when delivering an error
		**	message.
		*/

		mci_flush(FALSE, NULL);

# endif /* HASFLOCK */

		break;
	}

	if (splitenv != NULL)
	{
		if (tTd(13, 1))
		{
			printf("\nsendall: Split queue; remaining queue:\n");
			printaddr(e->e_sendqueue, TRUE);
		}

		for (ee = splitenv; ee != NULL; ee = ee->e_sibling)
		{
			CurEnv = ee;
			if (mode != SM_VERIFY)
				openxscript(ee);
			sendenvelope(ee, mode);
			dropenvelope(ee);
		}

		CurEnv = e;
	}
	sendenvelope(e, mode);
	Verbose = oldverbose;
}

void
sendenvelope(e, mode)
	register ENVELOPE *e;
	char mode;
{
	register ADDRESS *q;
	bool didany;

	/*
	**  If we have had global, fatal errors, don't bother sending
	**  the message at all if we are in SMTP mode.  Local errors
	**  (e.g., a single address failing) will still cause the other
	**  addresses to be sent.
	*/

	if (bitset(EF_FATALERRS, e->e_flags) &&
	    (OpMode == MD_SMTP || OpMode == MD_DAEMON))
	{
		e->e_flags |= EF_CLRQUEUE;
		return;
	}

	/*
	**  Run through the list and send everything.
	**
	**	Set EF_GLOBALERRS so that error messages during delivery
	**	result in returned mail.
	*/

	e->e_nsent = 0;
	e->e_flags |= EF_GLOBALERRS;
	didany = FALSE;

	/* now run through the queue */
	for (q = e->e_sendqueue; q != NULL; q = q->q_next)
	{
#ifdef XDEBUG
		char wbuf[MAXNAME + 20];

		(void) sprintf(wbuf, "sendall(%s)", q->q_paddr);
		checkfd012(wbuf);
#endif
		if (mode == SM_VERIFY)
		{
			e->e_to = q->q_paddr;
			if (!bitset(QDONTSEND|QBADADDR, q->q_flags))
			{
				if (q->q_host != NULL && q->q_host[0] != '\0')
					message("deliverable: mailer %s, host %s, user %s",
						q->q_mailer->m_name,
						q->q_host,
						q->q_user);
				else
					message("deliverable: mailer %s, user %s",
						q->q_mailer->m_name,
						q->q_user);
			}
		}
		else if (!bitset(QDONTSEND|QBADADDR, q->q_flags))
		{
# ifdef QUEUE
			/*
			**  Checkpoint the send list every few addresses
			*/

			if (e->e_nsent >= CheckpointInterval)
			{
				queueup(e, TRUE, FALSE);
				e->e_nsent = 0;
			}
# endif /* QUEUE */
			(void) deliver(e, q);
			didany = TRUE;
		}
	}
	if (didany)
	{
		e->e_dtime = curtime();
		e->e_ntries++;
	}

#ifdef XDEBUG
	checkfd012("end of sendenvelope");
#endif

	if (mode == SM_FORK)
		finis();
}
/*
**  DOFORK -- do a fork, retrying a couple of times on failure.
**
**	This MUST be a macro, since after a vfork we are running
**	two processes on the same stack!!!
**
**	Parameters:
**		none.
**
**	Returns:
**		From a macro???  You've got to be kidding!
**
**	Side Effects:
**		Modifies the ==> LOCAL <== variable 'pid', leaving:
**			pid of child in parent, zero in child.
**			-1 on unrecoverable error.
**
**	Notes:
**		I'm awfully sorry this looks so awful.  That's
**		vfork for you.....
*/

# define NFORKTRIES	5

# ifndef FORK
# define FORK	fork
# endif

# define DOFORK(fORKfN) \
{\
	register int i;\
\
	for (i = NFORKTRIES; --i >= 0; )\
	{\
		pid = fORKfN();\
		if (pid >= 0)\
			break;\
		if (i > 0)\
			sleep((unsigned) NFORKTRIES - i);\
	}\
}
/*
**  DOFORK -- simple fork interface to DOFORK.
**
**	Parameters:
**		none.
**
**	Returns:
**		pid of child in parent.
**		zero in child.
**		-1 on error.
**
**	Side Effects:
**		returns twice, once in parent and once in child.
*/

dofork()
{
	register int pid = -1;

	DOFORK(fork);
	return (pid);
}
/*
**  DELIVER -- Deliver a message to a list of addresses.
**
**	This routine delivers to everyone on the same host as the
**	user on the head of the list.  It is clever about mailers
**	that don't handle multiple users.  It is NOT guaranteed
**	that it will deliver to all these addresses however -- so
**	deliver should be called once for each address on the
**	list.
**
**	Parameters:
**		e -- the envelope to deliver.
**		firstto -- head of the address list to deliver to.
**
**	Returns:
**		zero -- successfully delivered.
**		else -- some failure, see ExitStat for more info.
**
**	Side Effects:
**		The standard input is passed off to someone.
*/

int
deliver(e, firstto)
	register ENVELOPE *e;
	ADDRESS *firstto;
{
	char *host;			/* host being sent to */
	char *user;			/* user being sent to */
	char **pvp;
	register char **mvp;
	register char *p;
	register MAILER *m;		/* mailer for this recipient */
	ADDRESS *ctladdr;
	register MCI *mci;
	register ADDRESS *to = firstto;
	bool clever = FALSE;		/* running user smtp to this mailer */
	ADDRESS *tochain = NULL;	/* users chain in this mailer call */
	int rcode;			/* response code */
	char *firstsig;			/* signature of firstto */
	int pid = -1;
	char *curhost;
	time_t xstart;
	int mpvect[2];
	int rpvect[2];
	char *pv[MAXPV+1];
	char tobuf[TOBUFSIZE];		/* text line of to people */
	char buf[MAXNAME + 1];
	char rpathbuf[MAXNAME + 1];	/* translated return path */
	extern int checkcompat();

	errno = 0;
	if (bitset(QDONTSEND|QBADADDR|QQUEUEUP, to->q_flags))
		return (0);

#if NAMED_BIND
	/* unless interactive, try twice, over a minute */
	if (OpMode == MD_DAEMON || OpMode == MD_SMTP)
	{
		_res.retrans = 30;
		_res.retry = 2;
	}
#endif

	m = to->q_mailer;
	host = to->q_host;
	CurEnv = e;			/* just in case */
	e->e_statmsg = NULL;
	SmtpError[0] = '\0';
	xstart = curtime();

	if (tTd(10, 1))
		printf("\n--deliver, id=%s, mailer=%s, host=`%s', first user=`%s'\n",
			e->e_id, m->m_name, host, to->q_user);
	if (tTd(10, 100))
		printopenfds(FALSE);

	/*
	**  Do initial argv setup.
	**	Insert the mailer name.  Notice that $x expansion is
	**	NOT done on the mailer name.  Then, if the mailer has
	**	a picky -f flag, we insert it as appropriate.  This
	**	code does not check for 'pv' overflow; this places a
	**	manifest lower limit of 4 for MAXPV.
	**		The from address rewrite is expected to make
	**		the address relative to the other end.
	*/

	/* rewrite from address, using rewriting rules */
	rcode = EX_OK;
	if (bitnset(M_UDBENVELOPE, e->e_from.q_mailer->m_flags))
		p = e->e_sender;
	else
		p = e->e_from.q_paddr;
	(void) strcpy(rpathbuf, remotename(p, m,
					   RF_SENDERADDR|RF_CANONICAL,
					   &rcode, e));
	define('g', rpathbuf, e);		/* translated return path */
	define('h', host, e);			/* to host */
	Errors = 0;
	pvp = pv;
	*pvp++ = m->m_argv[0];

	/* insert -f or -r flag as appropriate */
	if (FromFlag && (bitnset(M_FOPT, m->m_flags) || bitnset(M_ROPT, m->m_flags)))
	{
		if (bitnset(M_FOPT, m->m_flags))
			*pvp++ = "-f";
		else
			*pvp++ = "-r";
		*pvp++ = newstr(rpathbuf);
	}

	/*
	**  Append the other fixed parts of the argv.  These run
	**  up to the first entry containing "$u".  There can only
	**  be one of these, and there are only a few more slots
	**  in the pv after it.
	*/

	for (mvp = m->m_argv; (p = *++mvp) != NULL; )
	{
		/* can't use strchr here because of sign extension problems */
		while (*p != '\0')
		{
			if ((*p++ & 0377) == MACROEXPAND)
			{
				if (*p == 'u')
					break;
			}
		}

		if (*p != '\0')
			break;

		/* this entry is safe -- go ahead and process it */
		expand(*mvp, buf, sizeof buf, e);
		*pvp++ = newstr(buf);
		if (pvp >= &pv[MAXPV - 3])
		{
			syserr("554 Too many parameters to %s before $u", pv[0]);
			return (-1);
		}
	}

	/*
	**  If we have no substitution for the user name in the argument
	**  list, we know that we must supply the names otherwise -- and
	**  SMTP is the answer!!
	*/

	if (*mvp == NULL)
	{
		/* running SMTP */
# ifdef SMTP
		clever = TRUE;
		*pvp = NULL;
# else /* SMTP */
		/* oops!  we don't implement SMTP */
		syserr("554 SMTP style mailer not implemented");
		return (EX_SOFTWARE);
# endif /* SMTP */
	}

	/*
	**  At this point *mvp points to the argument with $u.  We
	**  run through our address list and append all the addresses
	**  we can.  If we run out of space, do not fret!  We can
	**  always send another copy later.
	*/

	tobuf[0] = '\0';
	e->e_to = tobuf;
	ctladdr = NULL;
	firstsig = hostsignature(firstto->q_mailer, firstto->q_host, e);
	for (; to != NULL; to = to->q_next)
	{
		/* avoid sending multiple recipients to dumb mailers */
		if (tobuf[0] != '\0' && !bitnset(M_MUSER, m->m_flags))
			break;

		/* if already sent or not for this host, don't send */
		if (bitset(QDONTSEND|QBADADDR|QQUEUEUP, to->q_flags) ||
		    to->q_mailer != firstto->q_mailer ||
		    strcmp(hostsignature(to->q_mailer, to->q_host, e), firstsig) != 0)
			continue;

		/* avoid overflowing tobuf */
		if (sizeof tobuf < (strlen(to->q_paddr) + strlen(tobuf) + 2))
			break;

		if (tTd(10, 1))
		{
			printf("\nsend to ");
			printaddr(to, FALSE);
		}

		/* compute effective uid/gid when sending */
		if (bitnset(M_RUNASRCPT, to->q_mailer->m_flags))
			ctladdr = getctladdr(to);

		if (tTd(10, 2))
		{
			printf("ctladdr=");
			printaddr(ctladdr, FALSE);
		}

		user = to->q_user;
		e->e_to = to->q_paddr;
		if (tTd(10, 5))
		{
			printf("deliver: QDONTSEND ");
			printaddr(to, FALSE);
		}
		to->q_flags |= QDONTSEND;

		/*
		**  Check to see that these people are allowed to
		**  talk to each other.
		*/

		if (m->m_maxsize != 0 && e->e_msgsize > m->m_maxsize)
		{
			e->e_flags |= EF_NO_BODY_RETN;
			mci->mci_status = "5.2.3";
			usrerr("552 Message is too large; %ld bytes max", m->m_maxsize);
			giveresponse(EX_UNAVAILABLE, m, NULL, ctladdr, xstart, e);
			continue;
		}
#if NAMED_BIND
		h_errno = 0;
#endif
		rcode = checkcompat(to, e);
		if (rcode != EX_OK)
		{
			markfailure(e, to, NULL, rcode);
			giveresponse(rcode, m, NULL, ctladdr, xstart, e);
			continue;
		}

		/*
		**  Strip quote bits from names if the mailer is dumb
		**	about them.
		*/

		if (bitnset(M_STRIPQ, m->m_flags))
		{
			stripquotes(user);
			stripquotes(host);
		}

		/* hack attack -- delivermail compatibility */
		if (m == ProgMailer && *user == '|')
			user++;

		/*
		**  If an error message has already been given, don't
		**	bother to send to this address.
		**
		**	>>>>>>>>>> This clause assumes that the local mailer
		**	>> NOTE >> cannot do any further aliasing; that
		**	>>>>>>>>>> function is subsumed by sendmail.
		*/

		if (bitset(QBADADDR|QQUEUEUP, to->q_flags))
			continue;

		/* save statistics.... */
		markstats(e, to);

		/*
		**  See if this user name is "special".
		**	If the user name has a slash in it, assume that this
		**	is a file -- send it off without further ado.  Note
		**	that this type of addresses is not processed along
		**	with the others, so we fudge on the To person.
		*/

		if (strcmp(m->m_mailer, "[FILE]") == 0)
		{
			rcode = mailfile(user, ctladdr, e);
			giveresponse(rcode, m, NULL, ctladdr, xstart, e);
			e->e_nsent++;
			if (rcode == EX_OK)
			{
				to->q_flags |= QSENT;
				if (bitnset(M_LOCALMAILER, m->m_flags) &&
				    (e->e_receiptto != NULL ||
				     bitset(QPINGONSUCCESS, to->q_flags)))
				{
					to->q_flags |= QDELIVERED;
					to->q_status = "2.1.5";
					fprintf(e->e_xfp, "%s... Successfully delivered\n",
						to->q_paddr);
				}
			}
			to->q_statdate = curtime();
			continue;
		}

		/*
		**  Address is verified -- add this user to mailer
		**  argv, and add it to the print list of recipients.
		*/

		/* link together the chain of recipients */
		to->q_tchain = tochain;
		tochain = to;

		/* create list of users for error messages */
		(void) strcat(tobuf, ",");
		(void) strcat(tobuf, to->q_paddr);
		define('u', user, e);		/* to user */
		p = to->q_home;
		if (p == NULL && ctladdr != NULL)
			p = ctladdr->q_home;
		define('z', p, e);	/* user's home */

		/*
		**  Expand out this user into argument list.
		*/

		if (!clever)
		{
			expand(*mvp, buf, sizeof buf, e);
			*pvp++ = newstr(buf);
			if (pvp >= &pv[MAXPV - 2])
			{
				/* allow some space for trailing parms */
				break;
			}
		}
	}

	/* see if any addresses still exist */
	if (tobuf[0] == '\0')
	{
		define('g', (char *) NULL, e);
		return (0);
	}

	/* print out messages as full list */
	e->e_to = tobuf + 1;

	/*
	**  Fill out any parameters after the $u parameter.
	*/

	while (!clever && *++mvp != NULL)
	{
		expand(*mvp, buf, sizeof buf, e);
		*pvp++ = newstr(buf);
		if (pvp >= &pv[MAXPV])
			syserr("554 deliver: pv overflow after $u for %s", pv[0]);
	}
	*pvp++ = NULL;

	/*
	**  Call the mailer.
	**	The argument vector gets built, pipes
	**	are created as necessary, and we fork & exec as
	**	appropriate.
	**	If we are running SMTP, we just need to clean up.
	*/

	/*XXX this seems a bit wierd */
	if (ctladdr == NULL && m != ProgMailer &&
	    bitset(QGOODUID, e->e_from.q_flags))
		ctladdr = &e->e_from;

#if NAMED_BIND
	if (ConfigLevel < 2)
		_res.options &= ~(RES_DEFNAMES | RES_DNSRCH);	/* XXX */
#endif

	if (tTd(11, 1))
	{
		printf("openmailer:");
		printav(pv);
	}
	errno = 0;
#if NAMED_BIND
	h_errno = 0;
#endif

	CurHostName = NULL;

	/*
	**  Deal with the special case of mail handled through an IPC
	**  connection.
	**	In this case we don't actually fork.  We must be
	**	running SMTP for this to work.  We will return a
	**	zero pid to indicate that we are running IPC.
	**  We also handle a debug version that just talks to stdin/out.
	*/

	curhost = NULL;
	SmtpPhase = NULL;
	mci = NULL;

#ifdef XDEBUG
	{
		char wbuf[MAXLINE];

		/* make absolutely certain 0, 1, and 2 are in use */
		sprintf(wbuf, "%s... openmailer(%s)", e->e_to, m->m_name);
		checkfd012(wbuf);
	}
#endif

	/* check for 8-bit available */
	if (bitset(EF_HAS8BIT, e->e_flags) &&
	    bitnset(M_7BITS, m->m_flags) &&
	    !bitset(MM_MIME8BIT, MimeMode))
	{
		usrerr("554 Cannot send 8-bit data to 7-bit destination");
		rcode = EX_DATAERR;
		e->e_status = "5.6.3";
		goto give_up;
	}

	/* check for Local Person Communication -- not for mortals!!! */
	if (strcmp(m->m_mailer, "[LPC]") == 0)
	{
		mci = (MCI *) xalloc(sizeof *mci);
		bzero((char *) mci, sizeof *mci);
		mci->mci_in = stdin;
		mci->mci_out = stdout;
		mci->mci_state = clever ? MCIS_OPENING : MCIS_OPEN;
		mci->mci_mailer = m;
	}
	else if (strcmp(m->m_mailer, "[IPC]") == 0 ||
		 strcmp(m->m_mailer, "[TCP]") == 0)
	{
#ifdef DAEMON
		register int i;
		register u_short port = 0;

		if (pv[0] == NULL || pv[1] == NULL || pv[1][0] == '\0')
		{
			syserr("null host name for %s mailer", m->m_mailer);
			rcode = EX_CONFIG;
			goto give_up;
		}

		CurHostName = pv[1];
		curhost = hostsignature(m, pv[1], e);

		if (curhost == NULL || curhost[0] == '\0')
		{
			syserr("null host signature for %s", pv[1]);
			rcode = EX_CONFIG;
			goto give_up;
		}

		if (!clever)
		{
			syserr("554 non-clever IPC");
			rcode = EX_CONFIG;
			goto give_up;
		}
		if (pv[2] != NULL)
			port = atoi(pv[2]);
tryhost:
		while (*curhost != '\0')
		{
			register char *p;
			static char hostbuf[MAXNAME + 1];

			/* pull the next host from the signature */
			p = strchr(curhost, ':');
			if (p == NULL)
				p = &curhost[strlen(curhost)];
			if (p == curhost)
			{
				syserr("deliver: null host name in signature");
				curhost++;
				continue;
			}
			strncpy(hostbuf, curhost, p - curhost);
			hostbuf[p - curhost] = '\0';
			if (*p != '\0')
				p++;
			curhost = p;

			/* see if we already know that this host is fried */
			CurHostName = hostbuf;
			mci = mci_get(hostbuf, m);
			if (mci->mci_state != MCIS_CLOSED)
			{
				if (tTd(11, 1))
				{
					printf("openmailer: ");
					mci_dump(mci, FALSE);
				}
				CurHostName = mci->mci_host;
				message("Using cached connection to %s via %s...",
					hostbuf, m->m_name);
				break;
			}
			mci->mci_mailer = m;
			if (mci->mci_exitstat != EX_OK)
				continue;

			/* try the connection */
			setproctitle("%s %s: %s", e->e_id, hostbuf, "user open");
			message("Connecting to %s via %s...",
				hostbuf, m->m_name);
			i = makeconnection(hostbuf, port, mci,
				bitnset(M_SECURE_PORT, m->m_flags));
			mci->mci_exitstat = i;
			mci->mci_errno = errno;
#if NAMED_BIND
			mci->mci_herrno = h_errno;
#endif
			if (i == EX_OK)
			{
				mci->mci_state = MCIS_OPENING;
				mci_cache(mci);
				if (TrafficLogFile != NULL)
					fprintf(TrafficLogFile, "%05d == CONNECT %s\n",
						getpid(), hostbuf);
				break;
			}
			else if (tTd(11, 1))
				printf("openmailer: makeconnection => stat=%d, errno=%d\n",
					i, errno);

			/* enter status of this host */
			setstat(i);

			/* should print some message here for -v mode */
		}
		if (mci == NULL)
		{
			syserr("deliver: no host name");
			rcode = EX_OSERR;
			goto give_up;
		}
		mci->mci_pid = 0;
#else /* no DAEMON */
		syserr("554 openmailer: no IPC");
		if (tTd(11, 1))
			printf("openmailer: NULL\n");
		rcode = EX_UNAVAILABLE;
		goto give_up;
#endif /* DAEMON */
	}
	else
	{
		/* flush any expired connections */
		(void) mci_scan(NULL);

		/* announce the connection to verbose listeners */
		if (host == NULL || host[0] == '\0')
			message("Connecting to %s...", m->m_name);
		else
			message("Connecting to %s via %s...", host, m->m_name);
		if (TrafficLogFile != NULL)
		{
			char **av;

			fprintf(TrafficLogFile, "%05d === EXEC", getpid());
			for (av = pv; *av != NULL; av++)
				fprintf(TrafficLogFile, " %s", *av);
			fprintf(TrafficLogFile, "\n");
		}

		/* create a pipe to shove the mail through */
		if (pipe(mpvect) < 0)
		{
			syserr("%s... openmailer(%s): pipe (to mailer)",
				e->e_to, m->m_name);
			if (tTd(11, 1))
				printf("openmailer: NULL\n");
			rcode = EX_OSERR;
			goto give_up;
		}

		/* if this mailer speaks smtp, create a return pipe */
		if (clever && pipe(rpvect) < 0)
		{
			syserr("%s... openmailer(%s): pipe (from mailer)",
				e->e_to, m->m_name);
			(void) close(mpvect[0]);
			(void) close(mpvect[1]);
			if (tTd(11, 1))
				printf("openmailer: NULL\n");
			rcode = EX_OSERR;
			goto give_up;
		}

		/*
		**  Actually fork the mailer process.
		**	DOFORK is clever about retrying.
		**
		**	Dispose of SIGCHLD signal catchers that may be laying
		**	around so that endmail will get it.
		*/

		if (e->e_xfp != NULL)
			(void) fflush(e->e_xfp);		/* for debugging */
		(void) fflush(stdout);
# ifdef SIGCHLD
		(void) setsignal(SIGCHLD, SIG_DFL);
# endif /* SIGCHLD */
		DOFORK(FORK);
		/* pid is set by DOFORK */
		if (pid < 0)
		{
			/* failure */
			syserr("%s... openmailer(%s): cannot fork",
				e->e_to, m->m_name);
			(void) close(mpvect[0]);
			(void) close(mpvect[1]);
			if (clever)
			{
				(void) close(rpvect[0]);
				(void) close(rpvect[1]);
			}
			if (tTd(11, 1))
				printf("openmailer: NULL\n");
			rcode = EX_OSERR;
			goto give_up;
		}
		else if (pid == 0)
		{
			int i;
			int saveerrno;
			extern int DtableSize;

			if (e->e_lockfp != NULL)
				(void) close(fileno(e->e_lockfp));

			/* child -- set up input & exec mailer */
			(void) setsignal(SIGINT, SIG_IGN);
			(void) setsignal(SIGHUP, SIG_IGN);
			(void) setsignal(SIGTERM, SIG_DFL);

			/* tweak niceness */
			if (m->m_nice != 0)
				nice(m->m_nice);

			/* reset user and group */
			if (bitnset(M_SPECIFIC_UID, m->m_flags))
			{
				(void) setgid(m->m_gid);
				(void) setuid(m->m_uid);
			}
			else if (ctladdr != NULL && ctladdr->q_uid != 0)
			{
				(void) initgroups(ctladdr->q_ruser?
					ctladdr->q_ruser: ctladdr->q_user,
					ctladdr->q_gid);
				(void) setgid(ctladdr->q_gid);
				(void) setuid(ctladdr->q_uid);
			}
			else
			{
				(void) initgroups(DefUser, DefGid);
				if (m->m_gid == 0)
					(void) setgid(DefGid);
				else
					(void) setgid(m->m_gid);
				if (m->m_uid == 0)
					(void) setuid(DefUid);
				else
					(void) setuid(m->m_uid);
			}

			if (tTd(11, 2))
				printf("openmailer: running as r/euid=%d/%d\n",
					getuid(), geteuid());

			/* move into some "safe" directory */
			if (m->m_execdir != NULL)
			{
				char *p, *q;
				char buf[MAXLINE + 1];

				for (p = m->m_execdir; p != NULL; p = q)
				{
					q = strchr(p, ':');
					if (q != NULL)
						*q = '\0';
					expand(p, buf, sizeof buf, e);
					if (q != NULL)
						*q++ = ':';
					if (tTd(11, 20))
						printf("openmailer: trydir %s\n",
							buf);
					if (buf[0] != '\0' && chdir(buf) >= 0)
						break;
				}
			}

			/* arrange to filter std & diag output of command */
			if (clever)
			{
				(void) close(rpvect[0]);
				if (dup2(rpvect[1], STDOUT_FILENO) < 0)
				{
					syserr("%s... openmailer(%s): cannot dup pipe %d for stdout",
						e->e_to, m->m_name, rpvect[1]);
					_exit(EX_OSERR);
				}
				(void) close(rpvect[1]);
			}
			else if (OpMode == MD_SMTP || OpMode == MD_DAEMON ||
				  HoldErrs || DisConnected)
			{
				/* put mailer output in transcript */
				if (dup2(fileno(e->e_xfp), STDOUT_FILENO) < 0)
				{
					syserr("%s... openmailer(%s): cannot dup xscript %d for stdout",
						e->e_to, m->m_name,
						fileno(e->e_xfp));
					_exit(EX_OSERR);
				}
			}
			if (dup2(STDOUT_FILENO, STDERR_FILENO) < 0)
			{
				syserr("%s... openmailer(%s): cannot dup stdout for stderr",
					e->e_to, m->m_name);
				_exit(EX_OSERR);
			}

			/* arrange to get standard input */
			(void) close(mpvect[1]);
			if (dup2(mpvect[0], STDIN_FILENO) < 0)
			{
				syserr("%s... openmailer(%s): cannot dup pipe %d for stdin",
					e->e_to, m->m_name, mpvect[0]);
				_exit(EX_OSERR);
			}
			(void) close(mpvect[0]);

			/* arrange for all the files to be closed */
			for (i = 3; i < DtableSize; i++)
			{
				register int j;

				if ((j = fcntl(i, F_GETFD, 0)) != -1)
					(void) fcntl(i, F_SETFD, j | 1);
			}

			/* run disconnected from terminal */
			(void) setsid();

			/* try to execute the mailer */
			execve(m->m_mailer, (ARGV_T) pv, (ARGV_T) UserEnviron);
			saveerrno = errno;
			syserr("Cannot exec %s", m->m_mailer);
			if (bitnset(M_LOCALMAILER, m->m_flags) ||
			    transienterror(saveerrno))
				_exit(EX_OSERR);
			_exit(EX_UNAVAILABLE);
		}

		/*
		**  Set up return value.
		*/

		mci = (MCI *) xalloc(sizeof *mci);
		bzero((char *) mci, sizeof *mci);
		mci->mci_mailer = m;
		mci->mci_state = clever ? MCIS_OPENING : MCIS_OPEN;
		mci->mci_pid = pid;
		(void) close(mpvect[0]);
		mci->mci_out = fdopen(mpvect[1], "w");
		if (mci->mci_out == NULL)
		{
			syserr("deliver: cannot create mailer output channel, fd=%d",
				mpvect[1]);
			(void) close(mpvect[1]);
			if (clever)
			{
				(void) close(rpvect[0]);
				(void) close(rpvect[1]);
			}
			rcode = EX_OSERR;
			goto give_up;
		}
		if (clever)
		{
			(void) close(rpvect[1]);
			mci->mci_in = fdopen(rpvect[0], "r");
			if (mci->mci_in == NULL)
			{
				syserr("deliver: cannot create mailer input channel, fd=%d",
					mpvect[1]);
				(void) close(rpvect[0]);
				fclose(mci->mci_out);
				mci->mci_out = NULL;
				rcode = EX_OSERR;
				goto give_up;
			}
		}
		else
		{
			mci->mci_flags |= MCIF_TEMP;
			mci->mci_in = NULL;
		}
	}

	/*
	**  If we are in SMTP opening state, send initial protocol.
	*/

	if (clever && mci->mci_state != MCIS_CLOSED)
	{
		smtpinit(m, mci, e);
	}

	if (bitset(EF_HAS8BIT, e->e_flags) && bitnset(M_7BITS, m->m_flags))
		mci->mci_flags |= MCIF_CVT8TO7;
	else
		mci->mci_flags &= ~MCIF_CVT8TO7;

	if (tTd(11, 1))
	{
		printf("openmailer: ");
		mci_dump(mci, FALSE);
	}

	if (mci->mci_state != MCIS_OPEN)
	{
		/* couldn't open the mailer */
		rcode = mci->mci_exitstat;
		errno = mci->mci_errno;
#if NAMED_BIND
		h_errno = mci->mci_herrno;
#endif
		if (rcode == EX_OK)
		{
			/* shouldn't happen */
			syserr("554 deliver: rcode=%d, mci_state=%d, sig=%s",
				rcode, mci->mci_state, firstsig);
			rcode = EX_SOFTWARE;
		}
		else if (curhost != NULL && *curhost != '\0')
		{
			/* try next MX site */
			goto tryhost;
		}
	}
	else if (!clever)
	{
		/*
		**  Format and send message.
		*/

		putfromline(mci, e);
		(*e->e_puthdr)(mci, e->e_header, e);
		(*e->e_putbody)(mci, e, NULL);

		/* get the exit status */
		rcode = endmailer(mci, e, pv);
	}
	else
#ifdef SMTP
	{
		/*
		**  Send the MAIL FROM: protocol
		*/

		rcode = smtpmailfrom(m, mci, e);
		if (rcode == EX_OK)
		{
			register char *t = tobuf;
			register int i;

			/* send the recipient list */
			tobuf[0] = '\0';
			for (to = tochain; to != NULL; to = to->q_tchain)
			{
				e->e_to = to->q_paddr;
				if ((i = smtprcpt(to, m, mci, e)) != EX_OK)
				{
					markfailure(e, to, mci, i);
					giveresponse(i, m, mci, ctladdr, xstart, e);
				}
				else
				{
					*t++ = ',';
					for (p = to->q_paddr; *p; *t++ = *p++)
						continue;
					*t = '\0';
				}
			}

			/* now send the data */
			if (tobuf[0] == '\0')
			{
				rcode = EX_OK;
				e->e_to = NULL;
				if (bitset(MCIF_CACHED, mci->mci_flags))
					smtprset(m, mci, e);
			}
			else
			{
				e->e_to = tobuf + 1;
				rcode = smtpdata(m, mci, e);
			}

			/* now close the connection */
			if (!bitset(MCIF_CACHED, mci->mci_flags))
				smtpquit(m, mci, e);
		}
		if (rcode != EX_OK && curhost != NULL && *curhost != '\0')
		{
			/* try next MX site */
			goto tryhost;
		}
	}
#else /* not SMTP */
	{
		syserr("554 deliver: need SMTP compiled to use clever mailer");
		rcode = EX_CONFIG;
		goto give_up;
	}
#endif /* SMTP */
#if NAMED_BIND
	if (ConfigLevel < 2)
		_res.options |= RES_DEFNAMES | RES_DNSRCH;	/* XXX */
#endif

	/* arrange a return receipt if requested */
	if (rcode == EX_OK && e->e_receiptto != NULL &&
	    bitnset(M_LOCALMAILER, m->m_flags))
	{
		e->e_flags |= EF_SENDRECEIPT;
		/* do we want to send back more info? */
	}

	/*
	**  Do final status disposal.
	**	We check for something in tobuf for the SMTP case.
	**	If we got a temporary failure, arrange to queue the
	**		addressees.
	*/

  give_up:
	if (tobuf[0] != '\0')
		giveresponse(rcode, m, mci, ctladdr, xstart, e);
	for (to = tochain; to != NULL; to = to->q_tchain)
	{
		if (rcode != EX_OK)
			markfailure(e, to, mci, rcode);
		else if (!bitset(QBADADDR|QQUEUEUP, to->q_flags))
		{
			to->q_flags |= QSENT;
			to->q_statdate = curtime();
			e->e_nsent++;
			if (bitnset(M_LOCALMAILER, m->m_flags) &&
			    (e->e_receiptto != NULL ||
			     bitset(QPINGONSUCCESS, to->q_flags)))
			{
				to->q_flags |= QDELIVERED;
				to->q_status = "2.1.5";
				fprintf(e->e_xfp, "%s... Successfully delivered\n",
					to->q_paddr);
			}
			else if (bitset(QPINGONSUCCESS, to->q_flags) &&
				 bitset(QPRIMARY, to->q_flags) &&
				 !bitset(MCIF_DSN, mci->mci_flags))
			{
				to->q_flags |= QRELAYED;
				fprintf(e->e_xfp, "%s... relayed; expect no further notifications\n",
					to->q_paddr);
			}
		}
	}

	/*
	**  Restore state and return.
	*/

#ifdef XDEBUG
	{
		char wbuf[MAXLINE];

		/* make absolutely certain 0, 1, and 2 are in use */
		sprintf(wbuf, "%s... end of deliver(%s)",
			e->e_to == NULL ? "NO-TO-LIST" : e->e_to,
			m->m_name);
		checkfd012(wbuf);
	}
#endif

	errno = 0;
	define('g', (char *) NULL, e);
	return (rcode);
}
/*
**  MARKFAILURE -- mark a failure on a specific address.
**
**	Parameters:
**		e -- the envelope we are sending.
**		q -- the address to mark.
**		mci -- mailer connection information.
**		rcode -- the code signifying the particular failure.
**
**	Returns:
**		none.
**
**	Side Effects:
**		marks the address (and possibly the envelope) with the
**			failure so that an error will be returned or
**			the message will be queued, as appropriate.
*/

markfailure(e, q, mci, rcode)
	register ENVELOPE *e;
	register ADDRESS *q;
	register MCI *mci;
	int rcode;
{
	char *stat = NULL;

	switch (rcode)
	{
	  case EX_OK:
		break;

	  case EX_TEMPFAIL:
	  case EX_IOERR:
	  case EX_OSERR:
		q->q_flags |= QQUEUEUP;
		break;

	  default:
		q->q_flags |= QBADADDR;
		break;
	}

	/* find most specific error code possible */
	if (q->q_status == NULL && mci != NULL)
		q->q_status = mci->mci_status;
	if (q->q_status == NULL)
		q->q_status = e->e_status;
	if (q->q_status == NULL)
	{
		switch (rcode)
		{
		  case EX_USAGE:
			stat = "5.5.4";
			break;

		  case EX_DATAERR:
			stat = "5.5.2";
			break;

		  case EX_NOUSER:
			stat = "5.1.1";
			break;

		  case EX_NOHOST:
			stat = "5.1.2";
			break;

		  case EX_NOINPUT:
		  case EX_CANTCREAT:
		  case EX_NOPERM:
			stat = "5.3.0";
			break;

		  case EX_UNAVAILABLE:
		  case EX_SOFTWARE:
		  case EX_OSFILE:
		  case EX_PROTOCOL:
		  case EX_CONFIG:
			stat = "5.5.0";
			break;

		  case EX_OSERR:
		  case EX_IOERR:
			stat = "4.5.0";
			break;

		  case EX_TEMPFAIL:
			stat = "4.2.0";
			break;
		}
		if (stat != NULL)
			q->q_status = stat;
	}

	q->q_statdate = curtime();
	if (CurHostName != NULL && CurHostName[0] != '\0')
		q->q_statmta = newstr(CurHostName);
	if (rcode != EX_OK && q->q_rstatus == NULL)
	{
		char buf[30];

		(void) sprintf(buf, "%d", rcode);
		q->q_rstatus = newstr(buf);
	}
}
/*
**  ENDMAILER -- Wait for mailer to terminate.
**
**	We should never get fatal errors (e.g., segmentation
**	violation), so we report those specially.  For other
**	errors, we choose a status message (into statmsg),
**	and if it represents an error, we print it.
**
**	Parameters:
**		pid -- pid of mailer.
**		e -- the current envelope.
**		pv -- the parameter vector that invoked the mailer
**			(for error messages).
**
**	Returns:
**		exit code of mailer.
**
**	Side Effects:
**		none.
*/

endmailer(mci, e, pv)
	register MCI *mci;
	register ENVELOPE *e;
	char **pv;
{
	int st;

	/* close any connections */
	if (mci->mci_in != NULL)
		(void) xfclose(mci->mci_in, mci->mci_mailer->m_name, "mci_in");
	if (mci->mci_out != NULL)
		(void) xfclose(mci->mci_out, mci->mci_mailer->m_name, "mci_out");
	mci->mci_in = mci->mci_out = NULL;
	mci->mci_state = MCIS_CLOSED;

	/* in the IPC case there is nothing to wait for */
	if (mci->mci_pid == 0)
		return (EX_OK);

	/* wait for the mailer process to die and collect status */
	st = waitfor(mci->mci_pid);
	if (st == -1)
	{
		syserr("endmailer %s: wait", pv[0]);
		return (EX_SOFTWARE);
	}

	if (WIFEXITED(st))
	{
		/* normal death -- return status */
		return (WEXITSTATUS(st));
	}

	/* it died a horrid death */
	syserr("451 mailer %s died with signal %o",
		mci->mci_mailer->m_name, st);

	/* log the arguments */
	if (pv != NULL && e->e_xfp != NULL)
	{
		register char **av;

		fprintf(e->e_xfp, "Arguments:");
		for (av = pv; *av != NULL; av++)
			fprintf(e->e_xfp, " %s", *av);
		fprintf(e->e_xfp, "\n");
	}

	ExitStat = EX_TEMPFAIL;
	return (EX_TEMPFAIL);
}
/*
**  GIVERESPONSE -- Interpret an error response from a mailer
**
**	Parameters:
**		stat -- the status code from the mailer (high byte
**			only; core dumps must have been taken care of
**			already).
**		m -- the mailer info for this mailer.
**		mci -- the mailer connection info -- can be NULL if the
**			response is given before the connection is made.
**		ctladdr -- the controlling address for the recipient
**			address(es).
**		xstart -- the transaction start time, for computing
**			transaction delays.
**		e -- the current envelope.
**
**	Returns:
**		none.
**
**	Side Effects:
**		Errors may be incremented.
**		ExitStat may be set.
*/

giveresponse(stat, m, mci, ctladdr, xstart, e)
	int stat;
	register MAILER *m;
	register MCI *mci;
	ADDRESS *ctladdr;
	time_t xstart;
	ENVELOPE *e;
{
	register const char *statmsg;
	extern char *SysExMsg[];
	register int i;
	extern int N_SysEx;
	char buf[MAXLINE];

	/*
	**  Compute status message from code.
	*/

	i = stat - EX__BASE;
	if (stat == 0)
	{
		statmsg = "250 Sent";
		if (e->e_statmsg != NULL)
		{
			(void) sprintf(buf, "%s (%s)", statmsg, e->e_statmsg);
			statmsg = buf;
		}
	}
	else if (i < 0 || i > N_SysEx)
	{
		(void) sprintf(buf, "554 unknown mailer error %d", stat);
		stat = EX_UNAVAILABLE;
		statmsg = buf;
	}
	else if (stat == EX_TEMPFAIL)
	{
		(void) strcpy(buf, SysExMsg[i] + 1);
#if NAMED_BIND
		if (h_errno == TRY_AGAIN)
			statmsg = errstring(h_errno+E_DNSBASE);
		else
#endif
		{
			if (errno != 0)
				statmsg = errstring(errno);
			else
			{
#ifdef SMTP
				statmsg = SmtpError;
#else /* SMTP */
				statmsg = NULL;
#endif /* SMTP */
			}
		}
		if (statmsg != NULL && statmsg[0] != '\0')
		{
			(void) strcat(buf, ": ");
			(void) strcat(buf, statmsg);
		}
		statmsg = buf;
	}
#if NAMED_BIND
	else if (stat == EX_NOHOST && h_errno != 0)
	{
		statmsg = errstring(h_errno + E_DNSBASE);
		(void) sprintf(buf, "%s (%s)", SysExMsg[i] + 1, statmsg);
		statmsg = buf;
	}
#endif
	else
	{
		statmsg = SysExMsg[i];
		if (*statmsg++ == ':')
		{
			(void) sprintf(buf, "%s: %s", statmsg, errstring(errno));
			statmsg = buf;
		}
	}

	/*
	**  Print the message as appropriate
	*/

	if (stat == EX_OK || stat == EX_TEMPFAIL)
	{
		extern char MsgBuf[];

		message("%s", &statmsg[4]);
		if (stat == EX_TEMPFAIL && e->e_xfp != NULL)
			fprintf(e->e_xfp, "%s\n", &MsgBuf[4]);
	}
	else
	{
		char mbuf[8];

		Errors++;
		sprintf(mbuf, "%.3s %%s", statmsg);
		usrerr(mbuf, &statmsg[4]);
	}

	/*
	**  Final cleanup.
	**	Log a record of the transaction.  Compute the new
	**	ExitStat -- if we already had an error, stick with
	**	that.
	*/

	if (LogLevel > ((stat == EX_TEMPFAIL) ? 8 : (stat == EX_OK) ? 7 : 6))
		logdelivery(m, mci, &statmsg[4], ctladdr, xstart, e);

	if (tTd(11, 2))
		printf("giveresponse: stat=%d, e->e_message=%s\n",
			stat, e->e_message == NULL ? "<NULL>" : e->e_message);

	if (stat != EX_TEMPFAIL)
		setstat(stat);
	if (stat != EX_OK && (stat != EX_TEMPFAIL || e->e_message == NULL))
	{
		if (e->e_message != NULL)
			free(e->e_message);
		e->e_message = newstr(&statmsg[4]);
	}
	errno = 0;
#if NAMED_BIND
	h_errno = 0;
#endif
}
/*
**  LOGDELIVERY -- log the delivery in the system log
**
**	Care is taken to avoid logging lines that are too long, because
**	some versions of syslog have an unfortunate proclivity for core
**	dumping.  This is a hack, to be sure, that is at best empirical.
**
**	Parameters:
**		m -- the mailer info.  Can be NULL for initial queue.
**		mci -- the mailer connection info -- can be NULL if the
**			log is occuring when no connection is active.
**		stat -- the message to print for the status.
**		ctladdr -- the controlling address for the to list.
**		xstart -- the transaction start time, used for
**			computing transaction delay.
**		e -- the current envelope.
**
**	Returns:
**		none
**
**	Side Effects:
**		none
*/

logdelivery(m, mci, stat, ctladdr, xstart, e)
	MAILER *m;
	register MCI *mci;
	char *stat;
	ADDRESS *ctladdr;
	time_t xstart;
	register ENVELOPE *e;
{
# ifdef LOG
	register char *bp;
	register char *p;
	int l;
	char buf[512];

#  if (SYSLOG_BUFSIZE) >= 256
	bp = buf;
	if (ctladdr != NULL)
	{
		strcpy(bp, ", ctladdr=");
		strcat(bp, shortenstring(ctladdr->q_paddr, 83));
		bp += strlen(bp);
		if (bitset(QGOODUID, ctladdr->q_flags))
		{
			(void) sprintf(bp, " (%d/%d)",
					ctladdr->q_uid, ctladdr->q_gid);
			bp += strlen(bp);
		}
	}

	sprintf(bp, ", delay=%s", pintvl(curtime() - e->e_ctime, TRUE));
	bp += strlen(bp);

	if (xstart != (time_t) 0)
	{
		sprintf(bp, ", xdelay=%s", pintvl(curtime() - xstart, TRUE));
		bp += strlen(bp);
	}

	if (m != NULL)
	{
		(void) strcpy(bp, ", mailer=");
		(void) strcat(bp, m->m_name);
		bp += strlen(bp);
	}

	if (mci != NULL && mci->mci_host != NULL)
	{
# ifdef DAEMON
		extern SOCKADDR CurHostAddr;
# endif

		(void) strcpy(bp, ", relay=");
		(void) strcat(bp, mci->mci_host);

# ifdef DAEMON
		(void) strcat(bp, " [");
		(void) strcat(bp, anynet_ntoa(&CurHostAddr));
		(void) strcat(bp, "]");
# endif
	}
	else if (strcmp(stat, "queued") != 0)
	{
		char *p = macvalue('h', e);

		if (p != NULL && p[0] != '\0')
		{
			(void) strcpy(bp, ", relay=");
			(void) strcat(bp, p);
		}
	}
	bp += strlen(bp);

#define STATLEN		(((SYSLOG_BUFSIZE) - 100) / 4)
#if (STATLEN) < 63
# undef STATLEN
# define STATLEN	63
#endif
#if (STATLEN) > 203
# undef STATLEN
# define STATLEN	203
#endif

	if ((bp - buf) > (sizeof buf - ((STATLEN) + 20)))
	{
		/* desperation move -- truncate data */
		bp = buf + sizeof buf - ((STATLEN) + 17);
		strcpy(bp, "...");
		bp += 3;
	}

	(void) strcpy(bp, ", stat=");
	bp += strlen(bp);

	(void) strcpy(bp, shortenstring(stat, (STATLEN)));

	l = SYSLOG_BUFSIZE - 100 - strlen(buf);
	p = e->e_to;
	while (strlen(p) >= (SIZE_T) l)
	{
		register char *q = strchr(p + l, ',');

		if (q == NULL)
			break;
		syslog(LOG_INFO, "%s: to=%.*s [more]%s",
			e->e_id, ++q - p, p, buf);
		p = q;
	}
	syslog(LOG_INFO, "%s: to=%s%s", e->e_id, p, buf);

#  else		/* we have a very short log buffer size */

	l = SYSLOG_BUFSIZE - 85;
	p = e->e_to;
	while (strlen(p) >= l)
	{
		register char *q = strchr(p + l, ',');

		if (q == NULL)
			break;
		syslog(LOG_INFO, "%s: to=%.*s [more]",
			e->e_id, ++q - p, p);
		p = q;
	}
	syslog(LOG_INFO, "%s: to=%s", e->e_id, p);

	if (ctladdr != NULL)
	{
		bp = buf;
		strcpy(buf, "ctladdr=");
		bp += strlen(buf);
		strcpy(bp, shortenstring(ctladdr->q_paddr, 83));
		bp += strlen(buf);
		if (bitset(QGOODUID, ctladdr->q_flags))
		{
			(void) sprintf(bp, " (%d/%d)",
					ctladdr->q_uid, ctladdr->q_gid);
			bp += strlen(bp);
		}
		syslog(LOG_INFO, "%s: %s", e->e_id, buf);
	}
	bp = buf;
	sprintf(bp, "delay=%s", pintvl(curtime() - e->e_ctime, TRUE));
	bp += strlen(bp);
	if (xstart != (time_t) 0)
	{
		sprintf(bp, ", xdelay=%s", pintvl(curtime() - xstart, TRUE));
		bp += strlen(bp);
	}

	if (m != NULL)
	{
		sprintf(bp, ", mailer=%s", m->m_name);
		bp += strlen(bp);
	}
	syslog(LOG_INFO, "%s: %s", e->e_id, buf);

	buf[0] = '\0';
	if (mci != NULL && mci->mci_host != NULL)
	{
# ifdef DAEMON
		extern SOCKADDR CurHostAddr;
# endif

		sprintf(buf, "relay=%s", mci->mci_host);

# ifdef DAEMON
		(void) strcat(buf, " [");
		(void) strcat(buf, anynet_ntoa(&CurHostAddr));
		(void) strcat(buf, "]");
# endif
	}
	else if (strcmp(stat, "queued") != 0)
	{
		char *p = macvalue('h', e);

		if (p != NULL && p[0] != '\0')
			sprintf(buf, "relay=%s", p);
	}
	if (buf[0] != '\0')
		syslog(LOG_INFO, "%s: %s", e->e_id, buf);

	syslog(LOG_INFO, "%s: stat=%s", e->e_id, shortenstring(stat, 63));
#  endif /* short log buffer */
# endif /* LOG */
}
/*
**  PUTFROMLINE -- output a UNIX-style from line (or whatever)
**
**	This can be made an arbitrary message separator by changing $l
**
**	One of the ugliest hacks seen by human eyes is contained herein:
**	UUCP wants those stupid "remote from <host>" lines.  Why oh why
**	does a well-meaning programmer such as myself have to deal with
**	this kind of antique garbage????
**
**	Parameters:
**		mci -- the connection information.
**		e -- the envelope.
**
**	Returns:
**		none
**
**	Side Effects:
**		outputs some text to fp.
*/

putfromline(mci, e)
	register MCI *mci;
	ENVELOPE *e;
{
	char *template = "\201l\n";
	char buf[MAXLINE];

	if (bitnset(M_NHDR, mci->mci_mailer->m_flags))
		return;

# ifdef UGLYUUCP
	if (bitnset(M_UGLYUUCP, mci->mci_mailer->m_flags))
	{
		char *bang;
		char xbuf[MAXLINE];

		expand("\201g", buf, sizeof buf, e);
		bang = strchr(buf, '!');
		if (bang == NULL)
		{
			errno = 0;
			syserr("554 No ! in UUCP From address! (%s given)", buf);
		}
		else
		{
			*bang++ = '\0';
			(void) sprintf(xbuf, "From %s  \201d remote from %s\n", bang, buf);
			template = xbuf;
		}
	}
# endif /* UGLYUUCP */
	expand(template, buf, sizeof buf, e);
	putxline(buf, mci, PXLF_NOTHINGSPECIAL);
}
/*
**  PUTBODY -- put the body of a message.
**
**	Parameters:
**		mci -- the connection information.
**		e -- the envelope to put out.
**		separator -- if non-NULL, a message separator that must
**			not be permitted in the resulting message.
**
**	Returns:
**		none.
**
**	Side Effects:
**		The message is written onto fp.
*/

/* values for output state variable */
#define OS_HEAD		0	/* at beginning of line */
#define OS_CR		1	/* read a carriage return */
#define OS_INLINE	2	/* putting rest of line */

putbody(mci, e, separator)
	register MCI *mci;
	register ENVELOPE *e;
	char *separator;
{
	char buf[MAXLINE];

	/*
	**  Output the body of the message
	*/

	if (e->e_dfp == NULL && bitset(EF_HAS_DF, e->e_flags))
	{
		char *df = queuename(e, 'd');

		e->e_dfp = fopen(df, "r");
		if (e->e_dfp == NULL)
			syserr("putbody: Cannot open %s for %s from %s",
				df, e->e_to, e->e_from.q_paddr);
	}
	if (e->e_dfp == NULL)
	{
		if (bitset(MCIF_INHEADER, mci->mci_flags))
		{
			putline("", mci);
			mci->mci_flags &= ~MCIF_INHEADER;
		}
		putline("<<< No Message Collected >>>", mci);
		goto endofmessage;
	}
	if (e->e_dfino == (ino_t) 0)
	{
		struct stat stbuf;

		if (fstat(fileno(e->e_dfp), &stbuf) < 0)
			e->e_dfino = -1;
		else
		{
			e->e_dfdev = stbuf.st_dev;
			e->e_dfino = stbuf.st_ino;
		}
	}
	rewind(e->e_dfp);

	if (bitset(MCIF_CVT8TO7, mci->mci_flags))
	{
		char *boundaries[MAXMIMENESTING + 1];

		/*
		**  Do 8 to 7 bit MIME conversion.
		*/

		/* make sure it looks like a MIME message */
		if (hvalue("MIME-Version", e->e_header) == NULL)
			putline("MIME-Version: 1.0", mci);

		if (hvalue("Content-Type", e->e_header) == NULL)
		{
			sprintf(buf, "Content-Type: text/plain; charset=%s",
				defcharset(e));
			putline(buf, mci);
		}

		/* now do the hard work */
		boundaries[0] = NULL;
		mime8to7(mci, e->e_header, e, boundaries, M87F_OUTER);
	}
	else
	{
		int ostate;
		register char *bp;
		register char *pbp;
		register int c;
		int padc;
		char *buflim;
		int pos = 0;
		char peekbuf[10];

		/* we can pass it through unmodified */
		if (bitset(MCIF_INHEADER, mci->mci_flags))
		{
			putline("", mci);
			mci->mci_flags &= ~MCIF_INHEADER;
		}

		/* determine end of buffer; allow for short mailer lines */
		buflim = &buf[sizeof buf - 1];
		if (mci->mci_mailer->m_linelimit > 0 &&
		    mci->mci_mailer->m_linelimit < sizeof buf - 1)
			buflim = &buf[mci->mci_mailer->m_linelimit - 1];

		/* copy temp file to output with mapping */
		ostate = OS_HEAD;
		bp = buf;
		pbp = peekbuf;
		while (!ferror(mci->mci_out))
		{
			register char *xp;

			if (pbp > peekbuf)
				c = *--pbp;
			else if ((c = getc(e->e_dfp)) == EOF)
				break;
			if (bitset(MCIF_7BIT, mci->mci_flags))
				c &= 0x7f;
			switch (ostate)
			{
			  case OS_HEAD:
				if (c != '\r' && c != '\n' && bp < buflim)
				{
					*bp++ = c;
					break;
				}

				/* check beginning of line for special cases */
				*bp = '\0';
				pos = 0;
				padc = EOF;
				if (buf[0] == 'F' &&
				    bitnset(M_ESCFROM, mci->mci_mailer->m_flags) &&
				    strncmp(buf, "From ", 5) == 0)
				{
					padc = '>';
				}
				if (buf[0] == '-' && buf[1] == '-' &&
				    separator != NULL)
				{
					/* possible separator */
					int sl = strlen(separator);

					if (strncmp(&buf[2], separator, sl) == 0)
						padc = ' ';
				}
				if (buf[0] == '.' &&
				    bitnset(M_XDOT, mci->mci_mailer->m_flags))
				{
					padc = '.';
				}

				/* now copy out saved line */
				if (TrafficLogFile != NULL)
				{
					fprintf(TrafficLogFile, "%05d >>> ", getpid());
					if (padc != EOF)
						putc(padc, TrafficLogFile);
					for (xp = buf; xp < bp; xp++)
						putc(*xp, TrafficLogFile);
					if (c == '\n')
						fputs(mci->mci_mailer->m_eol,
						      TrafficLogFile);
				}
				if (padc != EOF)
				{
					putc(padc, mci->mci_out);
					pos++;
				}
				for (xp = buf; xp < bp; xp++)
					putc(*xp, mci->mci_out);
				if (c == '\n')
				{
					fputs(mci->mci_mailer->m_eol,
					      mci->mci_out);
					pos = 0;
				}
				else
				{
					pos += bp - buf;
					if (c != '\r')
						*pbp++ = c;
				}
				bp = buf;

				/* determine next state */
				if (c == '\n')
					ostate = OS_HEAD;
				else if (c == '\r')
					ostate = OS_CR;
				else
					ostate = OS_INLINE;
				continue;

			  case OS_CR:
				if (c == '\n')
				{
					/* got CRLF */
					fputs(mci->mci_mailer->m_eol, mci->mci_out);
					if (TrafficLogFile != NULL)
					{
						fputs(mci->mci_mailer->m_eol,
						      TrafficLogFile);
					}
					ostate = OS_HEAD;
					continue;
				}

				/* had a naked carriage return */
				*pbp++ = c;
				c = '\r';
				goto putch;

			  case OS_INLINE:
				if (c == '\r')
				{
					ostate = OS_CR;
					continue;
				}
putch:
				if (mci->mci_mailer->m_linelimit > 0 &&
				    pos > mci->mci_mailer->m_linelimit &&
				    c != '\n')
				{
					putc('!', mci->mci_out);
					fputs(mci->mci_mailer->m_eol, mci->mci_out);
					if (TrafficLogFile != NULL)
					{
						fprintf(TrafficLogFile, "!%s",
							mci->mci_mailer->m_eol);
					}
					ostate = OS_HEAD;
					*pbp++ = c;
					continue;
				}
				if (TrafficLogFile != NULL)
					putc(c, TrafficLogFile);
				putc(c, mci->mci_out);
				pos++;
				ostate = c == '\n' ? OS_HEAD : OS_INLINE;
				break;
			}
		}
	}

	if (ferror(e->e_dfp))
	{
		syserr("putbody: df%s: read error", e->e_id);
		ExitStat = EX_IOERR;
	}

endofmessage:
	/* some mailers want extra blank line at end of message */
	if (bitnset(M_BLANKEND, mci->mci_mailer->m_flags) &&
	    buf[0] != '\0' && buf[0] != '\n')
		putline("", mci);

	(void) fflush(mci->mci_out);
	if (ferror(mci->mci_out) && errno != EPIPE)
	{
		syserr("putbody: write error");
		ExitStat = EX_IOERR;
	}
	errno = 0;
}
/*
**  MAILFILE -- Send a message to a file.
**
**	If the file has the setuid/setgid bits set, but NO execute
**	bits, sendmail will try to become the owner of that file
**	rather than the real user.  Obviously, this only works if
**	sendmail runs as root.
**
**	This could be done as a subordinate mailer, except that it
**	is used implicitly to save messages in ~/dead.letter.  We
**	view this as being sufficiently important as to include it
**	here.  For example, if the system is dying, we shouldn't have
**	to create another process plus some pipes to save the message.
**
**	Parameters:
**		filename -- the name of the file to send to.
**		ctladdr -- the controlling address header -- includes
**			the userid/groupid to be when sending.
**
**	Returns:
**		The exit code associated with the operation.
**
**	Side Effects:
**		none.
*/

mailfile(filename, ctladdr, e)
	char *filename;
	ADDRESS *ctladdr;
	register ENVELOPE *e;
{
	register FILE *f;
	register int pid = -1;
	int mode;

	if (tTd(11, 1))
	{
		printf("mailfile %s\n  ctladdr=", filename);
		printaddr(ctladdr, FALSE);
	}

	if (e->e_xfp != NULL)
		fflush(e->e_xfp);

	/*
	**  Fork so we can change permissions here.
	**	Note that we MUST use fork, not vfork, because of
	**	the complications of calling subroutines, etc.
	*/

	DOFORK(fork);

	if (pid < 0)
		return (EX_OSERR);
	else if (pid == 0)
	{
		/* child -- actually write to file */
		struct stat stb;
		struct stat fsb;
		MCI mcibuf;
		int oflags = O_WRONLY|O_APPEND;

		if (e->e_lockfp != NULL)
			(void) close(fileno(e->e_lockfp));

		(void) setsignal(SIGINT, SIG_DFL);
		(void) setsignal(SIGHUP, SIG_DFL);
		(void) setsignal(SIGTERM, SIG_DFL);
		(void) umask(OldUmask);

#ifdef HASLSTAT
		if ((SafeFileEnv != NULL ? lstat(filename, &stb)
					 : stat(filename, &stb)) < 0)
#else
		if (stat(filename, &stb) < 0)
#endif
		{
			stb.st_mode = FileMode;
			oflags |= O_CREAT|O_EXCL;
		}
		else if (bitset(0111, stb.st_mode) || stb.st_nlink != 1 ||
			 (SafeFileEnv != NULL && !S_ISREG(stb.st_mode)))
			exit(EX_CANTCREAT);
		mode = stb.st_mode;

		/* limit the errors to those actually caused in the child */
		errno = 0;
		ExitStat = EX_OK;

		if (ctladdr != NULL)
		{
			/* ignore setuid and setgid bits */
			mode &= ~(S_ISGID|S_ISUID);
		}

		/* we have to open the dfile BEFORE setuid */
		if (e->e_dfp == NULL && bitset(EF_HAS_DF, e->e_flags))
		{
			char *df = queuename(e, 'd');

			e->e_dfp = fopen(df, "r");
			if (e->e_dfp == NULL)
			{
				syserr("mailfile: Cannot open %s for %s from %s",
					df, e->e_to, e->e_from.q_paddr);
			}
		}

		if (SafeFileEnv != NULL && SafeFileEnv[0] != '\0')
		{
			int i;

			if (chroot(SafeFileEnv) < 0)
			{
				syserr("mailfile: Cannot chroot(%s)",
					SafeFileEnv);
				exit(EX_CANTCREAT);
			}
			i = strlen(SafeFileEnv);
			if (strncmp(SafeFileEnv, filename, i) == 0)
				filename += i;
		}
		if (chdir("/") < 0)
			syserr("mailfile: cannot chdir(/)");

		if (!bitset(S_ISGID, mode) || setgid(stb.st_gid) < 0)
		{
			if (ctladdr != NULL && ctladdr->q_uid != 0)
				(void) initgroups(ctladdr->q_ruser ?
					ctladdr->q_ruser : ctladdr->q_user,
					ctladdr->q_gid);
			else if (FileMailer != NULL && FileMailer->m_gid != 0)
				(void) initgroups(DefUser, FileMailer->m_gid);
			else
				(void) initgroups(DefUser, DefGid);
		}
		if (!bitset(S_ISUID, mode) || setuid(stb.st_uid) < 0)
		{
			if (ctladdr != NULL && ctladdr->q_uid != 0)
				(void) setuid(ctladdr->q_uid);
			else if (FileMailer != NULL && FileMailer->m_uid != 0)
				(void) setuid(FileMailer->m_uid);
			else
				(void) setuid(DefUid);
		}
		FileName = filename;
		LineNumber = 0;
		f = dfopen(filename, oflags, FileMode);
		if (f == NULL)
		{
			message("554 cannot open: %s", errstring(errno));
			exit(EX_CANTCREAT);
		}
		if (fstat(fileno(f), &fsb) < 0 ||
		    (!bitset(O_CREAT, oflags) &&
		     (stb.st_nlink != fsb.st_nlink ||
		      stb.st_dev != fsb.st_dev ||
		      stb.st_ino != fsb.st_ino ||
		      stb.st_uid != fsb.st_uid)))
		{
			message("554 cannot write: file changed after open");
			exit(EX_CANTCREAT);
		}

		bzero(&mcibuf, sizeof mcibuf);
		mcibuf.mci_mailer = FileMailer;
		mcibuf.mci_out = f;
		if (bitnset(M_7BITS, FileMailer->m_flags))
			mcibuf.mci_flags |= MCIF_7BIT;

		putfromline(&mcibuf, e);
		(*e->e_puthdr)(&mcibuf, e->e_header, e);
		(*e->e_putbody)(&mcibuf, e, NULL);
		putline("\n", &mcibuf);
		if (ferror(f))
		{
			message("451 I/O error: %s", errstring(errno));
			setstat(EX_IOERR);
		}
		(void) xfclose(f, "mailfile", filename);
		(void) fflush(stdout);

		/* reset ISUID & ISGID bits for paranoid systems */
		(void) chmod(filename, (int) stb.st_mode);
		exit(ExitStat);
		/*NOTREACHED*/
	}
	else
	{
		/* parent -- wait for exit status */
		int st;

		st = waitfor(pid);
		if (WIFEXITED(st))
			return (WEXITSTATUS(st));
		else
		{
			syserr("child died on signal %d", st);
			return (EX_UNAVAILABLE);
		}
		/*NOTREACHED*/
	}
}
/*
**  HOSTSIGNATURE -- return the "signature" for a host.
**
**	The signature describes how we are going to send this -- it
**	can be just the hostname (for non-Internet hosts) or can be
**	an ordered list of MX hosts.
**
**	Parameters:
**		m -- the mailer describing this host.
**		host -- the host name.
**		e -- the current envelope.
**
**	Returns:
**		The signature for this host.
**
**	Side Effects:
**		Can tweak the symbol table.
*/

char *
hostsignature(m, host, e)
	register MAILER *m;
	char *host;
	ENVELOPE *e;
{
	register char *p;
	register STAB *s;
	int i;
	int len;
#if NAMED_BIND
	int nmx;
	auto int rcode;
	char *hp;
	char *endp;
	int oldoptions = _res.options;
	char *mxhosts[MAXMXHOSTS + 1];
#endif

	/*
	**  Check to see if this uses IPC -- if not, it can't have MX records.
	*/

	p = m->m_mailer;
	if (strcmp(p, "[IPC]") != 0 && strcmp(p, "[TCP]") != 0)
	{
		/* just an ordinary mailer */
		return host;
	}

	/*
	**  Look it up in the symbol table.
	*/

	s = stab(host, ST_HOSTSIG, ST_ENTER);
	if (s->s_hostsig != NULL)
		return s->s_hostsig;

	/*
	**  Not already there -- create a signature.
	*/

#if NAMED_BIND
	if (ConfigLevel < 2)
		_res.options &= ~(RES_DEFNAMES | RES_DNSRCH);	/* XXX */

	for (hp = host; hp != NULL; hp = endp)
	{
		endp = strchr(hp, ':');
		if (endp != NULL)
			*endp = '\0';

		nmx = getmxrr(hp, mxhosts, TRUE, &rcode);

		if (nmx <= 0)
		{
			register MCI *mci;

			/* update the connection info for this host */
			mci = mci_get(hp, m);
			mci->mci_exitstat = rcode;
			mci->mci_errno = errno;
			mci->mci_herrno = h_errno;

			/* and return the original host name as the signature */
			nmx = 1;
			mxhosts[0] = hp;
		}

		len = 0;
		for (i = 0; i < nmx; i++)
		{
			len += strlen(mxhosts[i]) + 1;
		}
		if (s->s_hostsig != NULL)
			len += strlen(s->s_hostsig) + 1;
		p = xalloc(len);
		if (s->s_hostsig != NULL)
		{
			(void) strcpy(p, s->s_hostsig);
			free(s->s_hostsig);
			s->s_hostsig = p;
			p += strlen(p);
			*p++ = ':';
		}
		else
			s->s_hostsig = p;
		for (i = 0; i < nmx; i++)
		{
			if (i != 0)
				*p++ = ':';
			strcpy(p, mxhosts[i]);
			p += strlen(p);
		}
		if (endp != NULL)
			*endp++ = ':';
	}
	makelower(s->s_hostsig);
	if (ConfigLevel < 2)
		_res.options = oldoptions;
#else
	/* not using BIND -- the signature is just the host name */
	s->s_hostsig = host;
#endif
	if (tTd(17, 1))
		printf("hostsignature(%s) = %s\n", host, s->s_hostsig);
	return s->s_hostsig;
}