From: Michael Gronager <gronager@ceptacle.com>
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Date: Wed, 29 Feb 2012 14:09:26 +0100
Message-Id: <A0ED94EF-D9BE-4015-A8CB-30527CAA72EA@ceptacle.com>
To: Bitcoin Dev <bitcoin-development@lists.sourceforge.net>
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Subject: [Bitcoin-development] NATPMP and proxy support in libcoin
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I just finished adding NATPMP, together with IDG UPnP, to libcoin. This =
enables libcoin/bitcoind to setup port mapping also on Apple routers =
(AirPort Extreme/Express/TimeMachine) and a few other that supports this =
protocol.

libcoin/bitcoind first tried to setup mapping using UPnP, if that fails =
it resorts to using PMP.=20

It chooses a lease time of (default) 20 minutes and renews this every 10 =
minutes. This also means that if you are running libcoin on your laptop =
it will, when e.g. moved to your work, just setup the mapping there and =
the mapping back home will silently expire.

To include portmapping in libcoin/bitcoind the only thing needed is to =
add the PortMapper class and start it:

        PortMapper mapper(node.get_io_service(), port);
        if(portmap) mapper.start();

where "portmap" is the former "upnp" command line option.

Also note that I choose to include the relevant portions of miniupnpc =
and libnatpmp in the coinNAT library to make it easier to build.

I choose to make a rather aggressive setting for quitting searching for =
an IGD device (3 seconds). If I waited too long here the PMP port =
mapping would only kick in after the other clients had tried to connect =
to the new node and timed out.

If it is too small please notify me - I only have access to a UPnP =
router sporadicly.=20

And btw: Also added proxy capability to libcoin (have a look in =
coinChain/Proxy.h for implementation details).

Cheers,

Michael=