PORTMAP(8) BSD System Managers Manual PORTMAP(8)
portmap - DARPA port to RPC program number mapper
portmap [-d] [-f] [-t dir] [-v] [-i address]
Portmap is a server that converts RPC program numbers into DARPA protocol
port numbers. It must be running in order to make RPC calls.
When an RPC server is started, it will tell portmap what port number it
is listening to, and what RPC program numbers it is prepared to serve.
When a client wishes to make an RPC call to a given program number, it
will first contact portmap on the server machine to determine the port
number where RPC packets should be sent.
Portmap must be started before any RPC servers are invoked.
Normally portmap forks and dissociates itself from the terminal like any
other daemon. Portmap then logs errors using syslog(3).
-d (debug) prevents portmap from running as a daemon, and causes
errors and debugging information to be printed to the standard
-f (foreground) prevents portmap from running as a daemon, and
causes log messages to be printed to the standard error output.
-t dir (chroot) tell portmap to chroot(2) into dir. dir should be
empty, not writeable by the daemon user, and preferably on a
filesystem mounted read-only, noexec, nodev, and nosuid.
-v (verbose) run portmap in verbose mode.
bind portmap to address. If you specify 127.0.0.1 it will bind to
the loopback interface only.
This portmap version is protected by the tcp_wrapper library. You have to
give the clients access to portmap if they should be allowed to use it.
To allow connects from clients of the network 192.168. you could use the
following line in /etc/hosts.allow:
In order to avoid deadlocks, the portmap program does not attempt to look
up the remote host name or user name, nor will it try to match NIS net
groups. As a consequence only network number patterns (or IP addresses)
will work for portmap access control, do not use hostnames. Notice that
localhost will always be allowed access to the portmapper.
You have to use the daemon name portmap for the daemon name (even if the
binary has a different name). For the client names you can only use the
keyword ALL or IP addresses (NOT host or domain names).
For further information please have a look at the tcpd((8)),
hosts_allow((5)) and hosts_access((5)) manual pages.
inetd.conf((5)), rpcinfo((8)), pmap_set((8)), pmap_dump((8)), inetd((8)),
tcpd((8)), hosts_access((5)), hosts_options((5))
If portmap crashes, all rpc servers must be restarted.
The portmap command appeared in BSDBSD 4.3
This manual page was changed by Anibal Monsalve Salazar for the Debian
4.3 Berkeley Distribution March 16, 1991 4.3 Berkeley Distribution