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Date: Wed, 14 Aug 2013 18:06:25 -0400
From: Rich Felker <>
Subject: Re: dn_expand() confuses postfix

On Wed, Aug 14, 2013 at 02:19:20AM +0800, orc wrote:
> musl's dn_expand() confuses postfix - always returns 0, then postfix's
> libdns.a gets wrong shifts and gives up with something like:
> ../test_dns_lookup: lookup type MX flags 2
> ../test_dns_lookup: dns_query: (MX): OK
> ../test_dns_lookup: warning: dns_get_fixed: bad class: 30722
> ../test_dns_lookup: fatal: Name service error for type=MX: Malformed or unexpected name server reply
> If someone will face same error with postfix & musl, then get portable
> dn_expand.c from
> and put it
> in src/dns (edit to include src & obj).

I've committed some fixes to this code. Please let me know if the
issue persists; I did not have test cases to check that the return
value is right, so there's a possibility it may be off-by-one or


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