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enum clnt_stat pmap_rmtcall(...) ...

Request that the portmap on the host at IP address *addr make an RPC call on the behalf of the caller to a procedure on that host.

From a distant host, you can make a pmap_call call formatted as a mount request, and the portmapper will forward it to the port you request. When the mount daemon gets it, it will appear to originate from the local host. The mount daemon will verify that the filesystem is exported to the local host, and return a valid filehandle.

	rpc.mountd
	echo "nsf_portmon/W1" | abd -w /vmunix /dev/kmem

Now the mount deamon (modulo any bugs) will only accept requests from a privileged port. The rpc requests forwarded by the portmapper will (modulo any bugs) not originate from a privileged port. On a Sun you can acomplish the same just by adding '-p' to the startup of mountd in /etc/rc*. Another solution is to use the portmapper from tcp_wraper, it was protection againts the portmapper PMAPPROC_CALLIT procedure... Look it up in your Sun 'Network Programming Guide' pages 164 and 165.. Get Wietse Venema portmapper. For Solaris get Wietse rpcbind.