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experimenting with library Interposers (LD_PRELOAD)

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Name		Name	Last commit message	Last commit date
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.gitignore		.gitignore
Makefile		Makefile
README		README
wrap.c		wrap.c

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This is a simple experiment about using library interposition
by the LD_PRELOAD trick.

Simply the library is going to intercept some libc calls and
make stuffs.

In order to use this you can launch your application in this way

 $ LD_PRELOAD=./libwrap.so cat /etc/password >/dev/null
 [opened file: '/etc/passwd']
 $ LD_PRELOAD=./libwrap.so ncat google 80
 [opened file: '/etc/hosts']
 [connect to 208.67.222.222:53]
 [opened file: '/dev/urandom']
 [opened file: '/dev/urandom']
 [connect to 67.215.65.132:80]
 HTTP/1.0 408 Request Time-out
 Cache-Control: no-cache
 Connection: close
 Content-Type: text/html

 <html><body><h1>408 Request Time-out</h1>
 Your browser didn't send a complete request in time.
 </body></html>

INSTALLATION
------------

Nothing to install, simply compile it with

 $ make

LINK
----

 - http://ellzey.github.io/2014/03/22/preload-reload/