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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.

Example:

$ ping google.com
PING google.com (74.125.232.48) 56(84) bytes of data.
$ magic-command -m google.com=127.0.0.1 ping google.com
PING google.com (127.0.0.1) 56(84) bytes of data.
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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
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migrated from stackoverflow.com Jun 27 '11 at 19:30

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1 Answer

up vote 5 down vote

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 plash.beasts.org/wiki/PlashFAQs. You might need to intercept gethostbyname() or its friends instead. – netvope Feb 16 at 6:13
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