Date: Fri, 29 Nov 2013 22:59:13 -0500 From: Rich Felker <dalias@...ifal.cx> To: musl@...ts.openwall.com Subject: Re: IPv4 and IPv6 addresses in resolv.conf On Fri, Nov 29, 2013 at 10:51:16PM -0500, Rich Felker wrote: > On Fri, Nov 29, 2013 at 10:45:26PM -0500, Strake wrote: > > On 29/11/2013, Rich Felker <dalias@...ifal.cx> wrote: > > > But that would mean complete unconditional DNS failure on systems > > > lacking IPv6. > > > > We could do so iff system has IPv6. Switching on whether system has > > IPv6 rather than whether resolv.conf has any IPv6 nameservers means > > * no check whether resolv.conf includes v6 server > > * that adding a v6 server to resolv.conf can not break DNS even on > > systems lacking v6 > > which seems saner. > > OK, so how do we detect if the system "has IPv6"? I don't think it's BTW, short of an answer to this question, I think the approach I already suggested is rather safe. I can't imagine how an IPv6 nameserver address would end up in resolv.conf on a system completely lacking IPv6 support at the kernel level. Rich
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