Feature Requests item #2943341, was opened at 2010-01-31 20:11
Message generated for change (Comment added) made by bagder
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>Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Charles Kerr ()
Assigned to: Daniel Stenberg (bagder)
Summary: rfe: hooks for external DNS resolution

Initial Comment:
Many large distributions do not compile libcurl with c-ares, making DNS lookup unavoidably blocking. However there are other tools available for nonblocking DNS resolution, such as libevent's evdns module. I don't know why OSes don't build libcurl with c-ares, but it would be moot if libcurl had hooks for delegating DNS resolution to another tool.

Alternately maybe libcurl could require c-ares rather than leaving it as an option, but surely that's been discussed before, and there are probably reasons for leaving it as an optional requirement.

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>Comment By: Daniel Stenberg (bagder)
Date: 2010-01-31 23:39

Message:
I'm moving this to become a feature-request and not a bug. But in reality
nothing much will happen unless you bring this topic to the curl-library
mailing list, preferably with a will to do parts of the development
yourself.

distros don't use c-ares because c-ares is still not a feature-complete
replacement for the normal libc-based name resolver.

adding "hooks" to allow apps to do the DNS resolving with whatever code
they want would perhaps be cool, but it isn't just a single entry-point or
anything but a whole set of functions would be needed. In fact, all you
need is to "emulate" a set of c-ares functions and you're set.

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Received on 2010-01-31