Creating more complete router-to-auth protocol

A possible system and building blocks :

- Oauth for router-to-auth authentication
- http://liboauth.sourceforge.net/ (does not contain much code) could be used as a starting point for implementing it, since using it as-is is not necessarily desirable (dependency and MIT licence).

XML-RPC might be interesting but most of the librairies available for OpenWrt depend on a lot of big components.
http://ulxmlrpcpp.sourceforge.net/ (not in Openwrt) could be used as it only depends on libexpat which is available in Openwrt and is small.

I think that a REST architecture would be simpler, as robust as a XML-RPC, and would require less depencies. Then libexpat could be used for BOTH XML configuration, and the custom REST protocol. libhttpd could be kept.

uclibc++ seems to be mature enough to do what we need.

I would suggest JSON instead of XML for a RESTful protocol. REST is the most appropriate for a small device, the overhead is very low, the complexity is low. http://www.digip.org/jansson/ Jansson is a small C lib with few dependencies and fairly mature if C++ is a must, it can be used readily. http://lloyd.github.com/yajl/ Yajl is similar.

I'm a bit curious why C++ is assumed best for the embedded part, I understand the benefits of OO but C++, when stripped of almost anything but classes, it isn't all that much better. When including the nice features / libraries it starts sliding away from the memory footprint that's desirable on a device with 8-12MB in userland RAM.

I also think it's best to first design the wire protocol.