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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