NAT-PMP (NAT Port Mapping protocol) provides a way to do NAT traversal. It is implemented in Apple products (Airport extreme). libnatpmp is an attempt to make a portable and fully compliant implementation of the protocol for the client side. It is based on non-blocking sockets, and all calls of the API are asynchronous. It is therefore very easy to integrate the NAT-PMP code into any event driven code. License: BSD License (revised) Changes: This release introduces strnatpmperr() to print human-readable error messages. It improves the natpmpc.c sample and makes it install via "make install".

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