Date: Mon, 13 Apr 2020 19:51:23 +0200 From: Christian <list-christian@....de> To: musl@...ts.openwall.com Subject: Re: Resolver routines, Postfix DNSSEC troubles - how to check for incompatibilities? Am Montag, den 13.04.2020, 12:38 -0400 schrieb Rich Felker: > On Mon, Apr 13, 2020 at 05:52:34PM +0200, Florian Weimer wrote: > > * Christian: > > > So Viktor did some digging: > > "The comment on line 25: > > https://github.com/runtimejs/musl-libc/blob/master/include/resolv.h#L25 > > is not encouraging. It suggests that _res is unused. If so, Postfix > DNS does not work correctly with this C library. And not just for > DANE, since Postfix is also unable to to control RES_DEFNAMES and > RES_DNSRCH. > > Are these changes to the RES_DEFNAMES and RES_DNSRCH flags really > necessary? Why doesn't Postfix use res_query (or perhaps res_send) as > appropriate? > > But to actually answer these questions, modifying the flags is > presumably because traditional req_query builds an rfc1035 query or > edns query based on these flags derived from from resolv.conf, and > Postfix either assumes or wants to support the case where resolv.conf > is not already configured for edns, perhaps because it was generated > by a dhcp client. > > Rich > > I can't tell you much on the coding or why it is this way. I am merely a user that found the incompatibility. If this is of interest, you might want to get in contact with Viktor, e.g. via the postfix users mailing list. FYI: I just moved my config to a glibc setup in debian and it is working without issues, hence confirming Viktors finding, that Postfix won't work with musl
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