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Is it possible to set domain names mapping directly for an executable? As if we edit /etc/hosts/ and then run the executable.


$ ping
PING ( 56(84) bytes of data.
$ magic-command -m ping
PING ( 56(84) bytes of data.
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migrated from Jun 27 '11 at 19:30

This question came from our site for professional and enthusiast programmers.

Why? / What are you trying to accomplish? – Nix Jun 27 '11 at 17:24
Perhaps this should have been migrated to unix.SE instead of ServerFault? – Caleb Jun 28 '11 at 8:18

1 Answer 1

It is pissible to intercept most calls to libc with a creative usage of LD_PRELOAD and RTLD_NEXT. Google these strings, there's a lot of info out there. Intercept calls to open, substitute your own file for /etc/hosts. It should work.

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Intercepting calls to open() might not work for this case. See You might need to intercept gethostbyname() or its friends instead. – netvope Feb 16 '12 at 6:13

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