NEW: net/mcast-proxy

Hi all,

I'm actively using (and enjoying) the fruit of Rafael's work on his
multicast proxy daemon (see [1] for details). Although I still
believe it would be beneficial to have code exercising the kernel's
multicast bits in base, that doesn't seem to be in the stars (at this
moment). So, with Rafael's permission, I'm presenting a port of his
work.

[weerd@pom] $ cat pkg/DESCR
mcast-proxy is a small daemon that can be used for multicast streaming
setups. Run it on your gateway to have set-top boxes in your local
network able to fetch multicast streams from your IP-TV provider.

I'm hosting the code myself and have changed it to use user
_mcastproxy, with uid 791 reserved in infrastructure/db/usr.list:

Index: infrastructure/db/user.list
===================================================================
RCS file: /cvs/ports/infrastructure/db/user.list,v
retrieving revision 1.292
diff -u -p -r1.292 user.list
--- infrastructure/db/user.list 2 Jun 2017 16:47:23 -0000 1.292
+++ infrastructure/db/user.list 27 Jul 2017 19:07:43 -0000
@@ -299,3 +299,4 @@ id user group port options
788 _dnsdist _dnsdist net/dnsdist
789 _ftpsesame _ftpsesame net/ftpsesame
790 _mtr _mtr net/mtr
+791 _mcastproxy _mcastproxy net/mcast-proxy

It's been a while porting stuff, so this can probably use some thorogh
review. Bring it! :-)

[1]: https://marc.info/?l=openbsd-tech&m=149521121521976&w=2

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