Re: [exim-dev] RES_DNSRCH resolver option when using manualr…

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Author: Jeremy Harris
To: exim-dev
Subject: Re: [exim-dev] RES_DNSRCH resolver option when using manualroute router
On 27/12/17 14:44, Todd Lubin wrote:
> When using a manualroute router specifying route_data with "byname", exim
> calls [gethostbyname]. However, it explicitly disables the RES_DNSRCH
> resolver option.
> For dnslookup routers, there is a search_parents option, but for
> manualroute routers it is permanently disabled.
> It seems to me that this should either:
>    1. Be configurable within a manualroute router
>    2. Default to whatever the system-wide default is (which is often
>    enabled)


This might be platform-dependent. The linux manpage for res_search here
says that gethostbyname(3) uses RES_DNSRCH - and we call gethostbyname()
for a manualroute / byname. So I'm unsure whether the dns_init() call
we also do has any effect.

What platform are you running on?