It's possible using ipfw to mostly implement this, and with an upcoming change, possible
to completely implement this.
the "uid" function of ipfw can act as a "does there exist a socket to which this
packet would go?" test.
and a variant of it called "for_me" that I am adding (we use it at work) does
this even better.
so, basically,
yyy: skipto xxx ip from any to-me
yyy+1: fwd 127.0.0.1,1234
xxx:
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