Date: Wed, 07 Aug 2013 13:35:13 -0400 From: Lee Dilkie <lee@dilkie.com> To: Gregory Shapiro <gshapiro@freebsd.org> Cc: Pavel Timofeev <timp87@gmail.com>, freebsd-stable@freebsd.org Subject: Re: Sendmail-8.14.7 doesn't work with MS DNS in IPv4 network Message-ID: <52028551.2040305@dilkie.com> In-Reply-To: <20130807160528.GC13555@minime.local> References: <CAAoTqfurC_A8EsSz=jz4Cpkxj1=JutVnYQ-rpaB5eVyshm1g8w@mail.gmail.com> <20130807160528.GC13555@minime.local>
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On 8/7/2013 12:05 PM, Gregory Shapiro wrote:
>> I found a problem in new FreeBSD 9.2-{BETA2,RC1} which uses Sendmail-8.14.7.
>> If you try to send email from FreeBSD 9.2 in IPv4 network with MS DNS
>> you won't receive it.
>> But in same time email passes from FreeBSD 9.1-RELEASE which uses
>> Sendmail-8.14.5.
> The recent release made the following change:
>
> --- sendmail/conf.c 25 Jan 2011 18:31:30 -0000 8.1168
> +++ sendmail/conf.c 5 Apr 2013 17:39:09 -0000 8.1182
> @@ -4726,7 +4726,12 @@
> #else /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
> int nmaps;
> # if NETINET6
> - int flags = AI_DEFAULT|AI_ALL;
> +# ifndef SM_IPNODEBYNAME_FLAGS
> + /* For IPv4-mapped addresses, use: AI_DEFAULT|AI_ALL */
> +# define SM_IPNODEBYNAME_FLAGS AI_ADDRCONFIG
> +# endif /* SM_IPNODEBYNAME_FLAGS */
> +
> + int flags = SM_IPNODEBYNAME_FLAGS;
> int err;
> # endif /* NETINET6 */
> char *maptype[MAXMAPSTACK];
>
> Which is described in this release note:
>
> Drop support for IPv4-mapped IPv6 addresses to prevent the MTA
> from using a mapped address over a legitimate IPv6 address
> and to enforce the proper semantics over the IPv6
> connection. Problem noted by Ulrich Sporlein.
>
> It looks like that SERVFAIL from Microsoft's DNS server is getting
> in the way of that. I can look at adding this exception to
> WorkAroundBrokenAAAA as a possibility for a future release.
>
> I'd also like to hear feedback on whether the above change (changing
> getipnodebyname() flags from 'AI_DEFAULT | AI_ALL' to 'AI_ADDRCONFIG' went
> too far and what the accepted norm is for getipnodebyname().
>
getipnodebyname() is deprecated... getaddrinfo() should be used in this ipv6 world instead.
-lee
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