So I am not going to concentrate on the language itself. (well except for the actual web development part ) Therefore almost all of the functions & behaviors offered by Javascript you will find is also there in QtScript The patches for NEMO are written in QtScript which follows ECMAScript format guidelines same as. If you don't know already try to read up on it at-least a little before going forward If you know assembly language then it should be easy for you. To summarize - making a patch is a combination ofįinding byte patterns, finding referenced addresses, changing instructions, finding vacant spaces and adding new codes, updating calls etc. Not sure whether I made it clearer or confused you with that Intro. So you can use this common pattern instead of the individual ones. like find a string -> find where its pushed -> 8 bytes later there is a JNE -> change to JMPĪnother step that helps out is finding a common pattern in a set of clients around where your modification is to be done.įor e.g. If you know how the original bytes were found, try to make note of the procedure you followed and you can usually make a patch following same logic.įor e.g. So how do we make it generic?įor this you need a sort of flow-chart to follow to get to the locations where modification needs to be made and for getting the replace logic. Now these codes will be different for each client date and/or their location will change. a JNE to JMP so that the client behaves differently) (essentially we change a few opcodes or assembly instructions for e.g. When we say we patch a client what it means is we change few bytes with a different set of bytes. If you have made patches before skip ahead. Now Before we delve into the details, lets consider a few things - this is meant for newbies.
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