https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219674
Bug ID: 219674
Summary: rpcbind -h breaks broadcast functionality
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: bin
Assignee: freebsd-bugs@FreeBSD.org
Reporter: a...@freebsd.org
If rpcbind is started with -h <ip-addr> option, then it does not receive any
broadcast traffic. This is because the FreeBSD UDP stack passes an incoming
broadcast packet to a socket only if the socket is bound to either the
INADDR_ANY or to the same broadcast IP address as in the packet's destination.
Thus, any RPC services depending on the broadcast functionality stop working.
For example, ypbind is no longer able to discover ypserv(-s).
This behaviour is not documented at all neither in man pages nor in the
handbook (https://www.freebsd.org/doc/handbook/network-nis.html). At minimum,
the issue deserves a big warning, at maximum there should be an example of the
configuration tweaks required to work around the problem (e.g. using ypset,
etc).
Ideally, though, rpcbind should bind to each broadcast address matching any IP
address passed via -h.
Alternatively, we could add a socket option to allow a UDP socket to see the
matching [the interface] broadcast traffic in addition to the traffic destined
to the bound IP address.
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