btw, this --interface bug only shows when libcurl is built with c-ares as the resolver backend, both the threaded and stock resolver backends work fine. See tests with current git HEAD:

threaded:

./src/curl --interface iamwrong.moo.com localhost
curl: (45) Could not resolve host: iamwrong.moo.com

c-ares:

./src/curl --interface iamwrong.moo.com localhost
curl: (45) Could not resolve host: localhost (Domain name not found)

stock-resolver:

./src/curl --interface iamwrong.moo.com localhost
curl: (45) Couldn't bind to 'iamwrong.moo.com'

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** [bugs:#1191] When using a wrong hostname in --interface, the wrong host name appears in the error message**
**Status:** open-confirmed
**Created:** Sun Feb 10, 2013 11:30 PM UTC by Kim Vandry
**Last Updated:** Mon Feb 18, 2013 09:56 PM UTC
**Owner:** Daniel Stenberg
While testing my patch for #1189 I discovered a related problem which is pre-existing: I can reproduce it on the current git master. For test 1084, even though the exit code is correct (45, CURLE_INTERFACE_FAILED) the error text is wrong and confusing:
src/curl --interface DoesNotExist.example.com http://www.google.com/
curl: (45) Could not resolve host: www.google.com (Domain name not found)
Actually it failed to resolve DoesNotExist.example.com, not www.google.com like the error message says. If you use --proxy then the error message says "Could not resolve proxy" which is also not true.
I am not sure what the best way to fix this would be (I can think of a hack or two), but I just wanted to document it single I noticed it.
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