[Swan-dev] udpfromto()

[D. Hugh Redelmeier]

| New commits:
| commit 4b6ae4c757c85bbca12e048ab9eec7f7cce586b0
| Author: Andrew Cagney <cagney at gnu.org>
| Date:   Thu Feb 20 16:31:28 2020 -0500
| 
|     server: delete udpfromto.[hc]
|     
|     It was added in 2005 (I suspect to support ::/500) with the comment:
|     
|         we do not do anything with *to* addresses yet... we will.
|     
|     It's now 2020 and we still don't do anything with the TO address.
|     Since the code is IPv4 only (and annoyingly LGPL instead of GPL) I've
|     removed it.

Pre-historical note:

All sockets were bound to a paricular IP address and port.  So "to" is
known based on the socket.  I don't see why it needs to come from
udpfromto.

Paul and others have suggested binding sockets to 0.0.0.0.  I don't
think that that has happened yet.  When it does, something like
udpfromto might be more interesting.  Or it might not.