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From: vixie@decwrl.dec.com (Paul A Vixie)
Newsgroups: comp.mail.sendmail
Subject: Re: Problem with host sending MX-ed mail to itself
Message-ID: <VIXIE.91Feb15233058@volition.pa.dec.com>
Date: 16 Feb 91 05:30:58 GMT
References: <6166@rex.cs.tulane.edu>
Sender: news@pa.dec.com (News)
Organization: DEC Western Research Lab
Lines: 131
In-Reply-To: mb@rex.cs.tulane.edu's message of 15 Feb 91 15:13:25 GMT

As Mr. Rickert points out, you need to make sure that $w is the same as
the name listed in the MX.  If you are a multi-homed host, and your
interface addresses have different names attached to them, and if you
are listed in some MX's by one name and in other MX's by some other name,
then you might wish that sendmail would ignore MX's in $=w rather than
those which match $w, and in that case, you need a patch that I made to
KJS last week.  It will appear in the next release, which should also
be based on 5.65 (but don't hold your breath or you may turn blue).  The
patch goes something like this (assuming -DDECWRL in Makefile):

*** /tmp/,RCSt1a25728	Fri Feb 15 23:30:16 1991
--- domain.c	Thu Jan 31 13:41:35 1991
***************
*** 41,48 ****
  
  static char hostbuf[MAXMXHOSTS*PACKETSZ];
  
! getmxrr(host, mxhosts, localhost, rcode)
! 	char *host, **mxhosts, *localhost;
  	int *rcode;
  {
  	extern int h_errno;
--- 41,48 ----
  
  static char hostbuf[MAXMXHOSTS*PACKETSZ];
  
! getmxrr(host, mxhosts, rcode)
! 	char *host, **mxhosts;
  	int *rcode;
  {
  	extern int h_errno;
***************
*** 118,124 ****
  		if ((n = dn_expand((char *)&answer, eom, cp, bp, buflen)) < 0)
  			break;
  		cp += n;
! 		if (!strcasecmp(bp, localhost)) {
  			if (seenlocal == 0 || pref < localpref)
  				localpref = pref;
  			seenlocal = 1;
--- 118,124 ----
  		if ((n = dn_expand((char *)&answer, eom, cp, bp, buflen)) < 0)
  			break;
  		cp += n;
! 		if (host_is_local(bp)) {
  			if (seenlocal == 0 || pref < localpref)
  				localpref = pref;
  			seenlocal = 1;
***************
*** 166,171 ****
--- 166,179 ----
  		}
  	}
  	return(nmx);
+ }
+ 
+ int
+ host_is_local(h)
+ 	char *h;
+ {
+ 	STAB *s = stab(h, ST_CLASS, ST_FIND);
+ 	return (s != NULL && bitnset('w', s->s_class));
  }
  
  /*
*** /tmp/,RCSt1a25728	Fri Feb 15 23:30:17 1991
--- deliver.c	Thu Jan 31 13:35:22 1991
***************
*** 18,24 ****
  
  #ifndef lint
  static char sccsid[] = "@(#)deliver.c	5.26 (Berkeley) 1/1/89";
! static char rcsid[] = "$Header: deliver.c,v 1.8 90/10/23 20:03:33 vixie Locked $";
  #endif /* not lint */
  
  #include <sendmail.h>
--- 18,24 ----
  
  #ifndef lint
  static char sccsid[] = "@(#)deliver.c	5.26 (Berkeley) 1/1/89";
! static char rcsid[] = "$Header: deliver.c,v 1.8 90/10/23 20:03:33 vixie Exp $";
  #endif /* not lint */
  
  #include <sendmail.h>
***************
*** 449,466 ****
  #ifdef SMTP
  	if (clever)
  	{
  		expand("\001w", buf, &buf[sizeof(buf) - 1], e);
  		rcode = EX_OK;
  #ifdef NAMED_BIND
  		if (host[0] != '[' && m->m_mailer[0] != '/')
  		{
- 			Nmx = getmxrr(host, MxHosts, buf, &rcode);
  #ifdef DECWRL
  			if (Nmx == -1)
  			{
  				Nmx = 1;
  				MxHosts[0] = host;
  			}
  #endif DECWRL
  		}
  		else
--- 449,470 ----
  #ifdef SMTP
  	if (clever)
  	{
+ #ifndef DECWRL
  		expand("\001w", buf, &buf[sizeof(buf) - 1], e);
+ #endif DECWRL
  		rcode = EX_OK;
  #ifdef NAMED_BIND
  		if (host[0] != '[' && m->m_mailer[0] != '/')
  		{
  #ifdef DECWRL
+ 			Nmx = getmxrr(host, MxHosts, &rcode);
  			if (Nmx == -1)
  			{
  				Nmx = 1;
  				MxHosts[0] = host;
  			}
+ #else DECWRL
+ 			Nmx = getmxrr(host, MxHosts, buf, &rcode);
  #endif DECWRL
  		}
  		else
--
Paul Vixie
DEC Western Research Lab	<vixie@wrl.dec.com>
Palo Alto, California		...!decwrl!vixie