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PODLLHook - GZip decompression of a string
 

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  1. PODLLHook - GZip decompression of a string
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    <p>I am injecting a dll into firefox (browser) and hooking WSARecv. The problem is, that the data-buffer is Gzip-compressed. I already tried hooking the send() function and removing the "Accept-Encoding: gzip,deflate", but many webservers won't understand this.</p> <p>So I tried to stick with decompressing the buffer, changing some stuff and compressing it again. Therefore I linked the zlib.dll and zlib.lib into my DLL and wrote a small wrapper class:</p> <pre><code>int CGZip::DecompressString(char* src, int srcLen, char** destination, int* destLen) { //Define the source, destination, source length, and destination length char *dest= new char[(unsigned int)destLen]; //Decompress the string in src and place it in dest int result=uncompress((unsigned char *)dest,(uLongf*)destLen,(const unsigned char *)src,srcLen); //Return the results of the decompression *destination = dest; return(result); } </code></pre> <p>But when I include the decompression into the hooked WSARecv my dll won't get loaded anymore (no DLL_PROCESS_ATTACH is called). When I remove the following 5 lines the dll gets loaded again.</p> <pre><code>szUncompressed = (char*)malloc((size_t)lpBuffers-&gt;len * 100); CGZip *ziphandler = new CGZip(); ziphandler-&gt;DecompressString(lpBuffers-&gt;buf, lpBuffers-&gt;len, &amp;szUncompressed, &amp;iUncompressedLength); szUncompressed[iUncompressedLength] = '\0'; </code></pre> <p>Any idea why the DLL isn't loading anymore, or how I can easily decompress and compress the data buffer? </p> <p>Thanks in advance : )</p>
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