Date: Thu, 4 Jun 2009 21:26:17 -0700 From: Gregory Shapiro <gshapiro@freebsd.org> To: "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net> Cc: freebsd-hackers@freebsd.org Subject: Re: Jails, loopback interfaces and sendmail Message-ID: <20090605042617.GC639@monkeyboy.local> In-Reply-To: <20090604223448.GD465@rugsucker.smi.sendmail.com> References: <4A27D38B.6040108@erdgeist.org> <20090604203905.B12292@maildrop.int.zabbadoz.net> <20090604212123.GK59532@rugsucker.smi.sendmail.com> <20090604220734.H12292@maildrop.int.zabbadoz.net> <20090604223448.GD465@rugsucker.smi.sendmail.com>
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> Now that you mention it, we are already using separate FreeBSD files in
> src/etc/sendmail/freebsd{,.submit}.mc so I can do something different
> for FreeBSD. I think we are still in code slush and not freeze for 8.0.
> I'll double check and if so, make the change tonight (with a note in
> UPDATING). As I recall, nobody reported a problem resolving localhost
> under FreeBSD.
I'm going to hold off making this change. It looks like sendmail will
also add the domain in searching since the name isn't qualified:
/*
** Build the search list.
** If there is at least one dot in name, start with a null
** domain to search the unmodified name first.
** If name does not end with a dot and search up local domain
** tree desired, append each local domain component to the
** search list; if name contains no dots and default domain
** name is desired, append default domain name to search list;
** else if name ends in a dot, remove that dot.
*/
This leads to lookups that can cause problems:
dns_getcanonname(localhost, trymx=0)
dns_getcanonname: trying localhost.gshapiro.net (AAAA)
NO: errno=0, h_errno=4
dns_getcanonname: trying localhost.gshapiro.net (A)
YES
dns_getcanonname: localhost.gshapiro.net
getmxrr([localhost]) returns 1 value(s):
localhost.gshapiro.net.
We will have to look deeper, perhaps changing the code not to add the
default domain/search list in the case of "localhost".
For now, users who want to use localhost instead of 127.0.0.1 can make
the following change to their /etc/mail/`hostname`.submit.mc:
@@ -22,6 +22,5 @@
define(`confTIME_ZONE', `USE_TZ')dnl
define(`confDONT_INIT_GROUPS', `True')dnl
define(`confBIND_OPTS', `WorkAroundBrokenAAAA')dnl
-dnl
-dnl If you use IPv6 only, change [127.0.0.1] to [IPv6:::1]
-FEATURE(`msp', `[127.0.0.1]')dnl
+DAEMON_OPTIONS(`Name=NoMTA, Addr=localhost, M=E')dnl
+FEATURE(`msp', `[localhost]')dnl
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