[GNUnet-developers] TCP transport layer

[Christian Grothoff]

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Hi all!

I've just had some first success playing with the new TCP transport layer. 
This is the code to use TCP instead of UDP for peer-to-peer connections. TCP 
may be a better way to get around certain firewalls and the retransmission 
may also help on very flaky lines. 

What I tried was this:

A knows UDP (!) address of B. A establishes UDP connection to B as usual, thus 
B learns A's UDP (!) address and they exchange a sessionkey. After a while, 
both nodes use the UDP connection to advertise their own addresses, notably 
that they also offer TCP (potentially on a different port). The nodes probe 
that the TCP address that was advertised via UDP is valid (ping-pong) and 
store the additional TCP HELO in data/hosts. The ping-pong part confirms that 
the TCP connection works in both directions. 
While there may be bugs left, this should demonstrate that the basic design 
works. Note that the tcp and the udp implementations of the transport layer 
are each only about 600 lines of code.

Christian
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