NFSSERVER(8)

NAME

nfsserver, portmapper, pcnfsd − NFS service

SYNOPSIS

aux/nfsserver [ rpc-options... ] [ nfs-options... ]
aux/pcnfsd [ rpc-options... ]
aux/portmapper [ rpc-options... ]

DESCRIPTION

These programs collectively provide NFS access to Plan 9 file servers. Nfsserver, pcnfsd, and portmapper run on a Plan 9 CPU server, and should be started in that order. All users on client machines have the access privileges of the Plan 9 user none. Currently only NFS version 2 is served.

The rpc-options are all intended for debugging:

-r Reject: answer all RPC requests by returning the AUTH_TOOWEAK error.

-v Verbose: show all RPC calls and internal program state, including 9P messages. (In any case, the program creates a file /srv/name.chat where name is that of the program; echoing 1 or 0 into this file sets or clears the -v flag dynamically.)

-D Debug: show all RPC messages (at a lower level than -v). This flag may be repeated to get more detail.

-C Turn off caching: do not answer RPC requests using the RPC reply cache.

The nfs-options are:

-a addr Set up NFS service for the 9P server at network address addr.

-f file Set up NFS service for the 9P server at file (typically an entry in /srv).

-n Do not allow per-user authentication (default and mandatory).

-c file File contains the uid/gid map configuration. It is read at startup and subsequently every hour (or if c is echoed into /srv/nfsserver.chat). Blank lines or lines beginning with # are ignored; lines beginning with ! are executed as commands; otherwise lines contain four fields separated by white space: a regular expression (in the notation of regexp(6)) for a class of servers, a regular expression for a class of clients, a file of user id’s (in the format of a Unix password file), and a file of group id’s (same format).

-s Expect a network connection on file descriptor 1 instead of listening for incoming calls.

-t Listen for incoming TCP calls, rather than UDP calls.

NFS clients must be in the Plan 9 /lib/ndb database. The machine name is deduced from the IP address via ndb/query. The machine name specified in the NFS Unix credentials is completely ignored.

Pcnfsd is a toy program that authorizes PC-NFS clients. All clients are mapped to uid=1, gid=1 (daemon on most systems) regardless of name or password.

EXAMPLES

A simple /lib/ndb/nfs might contain:

!9fs tcp!ivy
.+ [^.]+\.cvrd\.hall\.edu /n/ivy/etc/passwd /n/ivy/etc/group

A typical entry in /rc/bin/cpurc might be:

aux/nfsserver -a tcp!pie -a tcp!yoshimi -c /lib/ndb/nfs
aux/pcnfsd
aux/portmapper

Assuming the CPU server’s name is eduardo, the mount commands on the client would be:

/etc/mount -o soft,intr eduardo:pie /n/pie
/etc/mount -o soft,intr eduardo:yoshimi /n/yoshimi

Note that a single instance of nfsserver may provide access to several 9P servers.

FILES

/lib/ndb/nfs
List of uid/gid maps.

/sys/log/nfs
Log file.

SOURCE

/sys/src/cmd/9nfs

BUGS

It would be nice to provide authentication for users, but Unix systems provide too low a level of security to be trusted in a Plan 9 world.

Museum

Related Articles