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    <p>You can create a wrapper library, which will intercept all calls to <code>setsockopt</code> and will be able to change some parameters. This works if your application have the call to setsockopt. In another case, you can wrap different function, e.g. <code>socket</code> using the same approach. In wrapper of <code>socket</code> you need to create a socket with __socket and then change any parameter you want.</p> <p>Wrapper library must be a dynamic one, with <code>setsockopt</code> function. This function is allowed to be overloaded by glibc. Then, start your programm as follows:</p> <pre><code> LD_PRELOAD=path_to_wrapper_library/libwrap.so ./you_program </code></pre> <p>The library will be injected (linked) into programm and will replace the setsockopt function.</p> <p>This works only with dynamically linked programms (check it with <code>ldd ./you_program</code> - there will be some /lib/*.so if it is dynamically linked).</p> <p>Original function can be called from your code with <code>__</code> prefix: <code>__setsockopt</code> or using <code>dlsym(RTLD_NEXT, "setsockopt");</code>.</p> <p>Some examples (not a setsockopt, but the idea of preload wrapper): <a href="http://scaryreasoner.wordpress.com/2007/11/17/using-ld_preload-libraries-and-glibc-backtrace-function-for-debugging/" rel="nofollow">http://scaryreasoner.wordpress.com/2007/11/17/using-ld_preload-libraries-and-glibc-backtrace-function-for-debugging/</a> or <a href="http://developers.sun.com/solaris/articles/lib_interposers_code.html" rel="nofollow">http://developers.sun.com/solaris/articles/lib_interposers_code.html</a></p> <p>Compile to dynamic library with:</p> <pre><code> gcc wrap.c -fPIC -shared -ldl -o libwrap.so </code></pre>
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    1. POis it possible to setsockopt() from command line
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    1. USosgx
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    1. COThank Osgx a lot. Your idea is very nice, think outside the box. I'll try to use this trick :D
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      1. USDien Nguyen
 

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