Generic Protocol Framework Generic Protocol Framework aims to allow users to rapidly prototype different emerging communications protocols.
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Generic Protocol Framework Description

Generic Protocol Framework aims to allow users to rapidly prototype different emerging communications protocols. Generic Protocol Framework aims to allow users to rapidly prototype different emerging communications protocols. Implementations can be easily "dropped in" and tested independant of a finished product. Testing on both the end product, and the protocol itself can be easily accomplished. The tool aims to provide the developer and end user with a robust solution which can track the size of messages, how rapidly they will be generated, and how many of each type can be seen.Why the GPF:There are many similar tools available. The problem with many of these tools is that they are 1) closed source, 2) not easily adaptable to a specific implementation (they use custom languages), 3) expensive. The advantages of the GPF are its open source nature, the ease of which it can be adapted, and the cost: free!Basic Flow:Modification of the GPF is fairly simple. Tool-opts.h contains the basic options that will be applied to the packet while it is being built. To transmit a packet, the system calls the tx_message() function, and passes the message ID as well as the option block. This is then passed to the custom function: tx_message_custom() in tx.c. From the message id, the system selects an appropriate tx_* function (to be implemented by the user) and passes an unsigned char **, where the buffer will be written, and the option block. In turn, that function will make heavy use of the add_buf_tu*() functions, which will allow the user to add a tubyte8, tuint16, or tuint32 number to the buffer. In daemonize mode, the basic options are set, and the system then listens for incomming packets. When a packet arrives, the system calls basic_parse() on the packet. This function then calls basic_parse_custom(), found in parse.c. In turn, this can call any appropriate parsing helpers, including the get_tu*() functions, which allow the user to retrieve a tubyte8, tuint16, or tuint32 from the buffer. CAVEAT: if the first two bytes of the buffer are zero'd, it will be treated as an END message. However, recovery is available. In the basic_parse_custom() message, you can set the end_signal_caught variable of the option_block to 0. In this case, it will not stop the daemon from running.What's New in This Release:· Currently, TCP support is somewhat experimental.· Testing for that portion will be ongoing.· No clear examples are provided.· The examples/ directory contains the precursors to a MIP example.

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