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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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  • 1
    Why? / What are you trying to accomplish?
    – Nix
    Jun 27, 2011 at 17:24
  • Perhaps this should have been migrated to unix.SE instead of ServerFault?
    – Caleb
    Jun 28, 2011 at 8:18

1 Answer 1

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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, 2012 at 6:13

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