2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
195 lines
5.6 KiB
Groff
195 lines
5.6 KiB
Groff
.\" $NetBSD: nfssvc.2,v 1.24 2009/03/10 21:00:47 joerg Exp $
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.\"
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.\" Copyright (c) 1989, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)nfssvc.2 8.1 (Berkeley) 6/9/93
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.\"
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.Dd December 30, 2006
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.Dt NFSSVC 2
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.Os
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.Sh NAME
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.Nm nfssvc
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.Nd NFS services
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In unistd.h
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.In nfs/nfs.h
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.Ft int
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.Fn nfssvc "int flags" "void *argstructp"
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.Sh DESCRIPTION
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The
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.Fn nfssvc
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function is used by the NFS daemons to pass information into and out
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of the kernel and also to enter the kernel as a server daemon.
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The
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.Fa flags
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argument consists of several bits that show what action is to be taken
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once in the kernel and the
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.Fa argstructp
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points to one of three structures depending on which bits are set in
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flags.
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.Ss Calls used by Xr nfsd 8
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On the server side,
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.Fn nfssvc
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is called with the flag
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.Dv NFSSVC_NFSD
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and a pointer to a
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.Bd -literal
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struct nfsd_srvargs {
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struct nfsd *nsd_nfsd; /* Pointer to in kernel nfsd struct */
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uid_t nsd_uid; /* Effective uid mapped to cred */
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u_long nsd_haddr; /* Ip address of client */
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struct ucred nsd_cr; /* Cred. uid maps to */
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int nsd_authlen; /* Length of auth string (ret) */
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char *nsd_authstr; /* Auth string (ret) */
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};
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.Ed
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.Pp
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to enter the kernel as an
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.Xr nfsd 8
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daemon.
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Whenever an
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.Xr nfsd 8
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daemon receives a Kerberos authentication ticket, it will return from
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.Fn nfssvc
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with errno set to
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.Er ENEEDAUTH .
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The
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.Xr nfsd 8
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will attempt to authenticate the ticket and generate a set of credentials
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on the server for the
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.Dq user id
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specified in the field nsd_uid.
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This is done by first authenticating the Kerberos ticket and then mapping
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the Kerberos principal to a local name and getting a set of credentials for
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that user via
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.Xr getpwnam 3
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and
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.Xr getgrouplist 3 .
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If successful, the
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.Xr nfsd 8
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will call
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.Fn nfssvc
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with the
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.Dv NFSSVC_NFSD
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and
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.Dv NFSSVC_AUTHIN
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flags set to pass the credential mapping in nsd_cr into the
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kernel to be cached on the server socket for that client.
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If the authentication failed,
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.Xr nfsd 8
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calls
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.Fn nfssvc
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with the flags
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.Dv NFSSVC_NFSD
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and
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.Dv NFSSVC_AUTHINFAIL
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to denote an authentication failure.
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.Pp
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The master
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.Xr nfsd 8
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server daemon calls
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.Fn nfssvc
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with the flag
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.Dv NFSSVC_ADDSOCK
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and a pointer to a
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.Bd -literal
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struct nfsd_args {
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int sock; /* Socket to serve */
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caddr_t name; /* Client address for connection based sockets */
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int namelen; /* Length of name */
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};
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.Ed
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.Pp
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to pass a server side
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.Tn NFS
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socket into the kernel for servicing by the
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.Xr nfsd 8
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daemons.
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.Ss Calls used by Xr mountd 8
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The
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.Xr mountd 8
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server daemon calls
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.Fn nfssvc
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with the flag
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.Dv NFSSVC_SETEXPORTSLIST
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and a pointer to a
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.Ft struct mountd_exports_list
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object to atomically change the exports lists of a specific file system.
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This structure has the following fields:
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.Bl -tag -width ".Vt const char *mel_path"
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.It Vt const char *mel_path
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Path to the file system that will have its exports list replaced by the
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one described in the other fields.
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.It Vt size_t mel_nexports
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Number of valid entries in the
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.Vt mel_export
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field.
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If zero, the exports list will be cleared for the given file system.
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.It Vt struct export_args mel_export[AF_MAX]
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Set of exports to be used for the given file system.
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.El
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.Sh RETURN VALUES
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Usually
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.Nm
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does not return unless the server
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is terminated by a signal when a value of 0 is returned.
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Otherwise, \-1 is returned and the global variable
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.Va errno
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is set to specify the error.
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.Sh ERRORS
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.Bl -tag -width Er
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.It Bq Er ENEEDAUTH
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This special error value is really used for authentication support,
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particularly Kerberos, as explained above.
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.It Bq Er EPERM
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The caller is not the super-user.
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.El
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.Sh SEE ALSO
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.Xr mount_nfs 8 ,
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.Xr nfsd 8
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.Sh HISTORY
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The
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.Nm
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function first appeared in
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.Bx 4.4 .
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.Sh BUGS
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The
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.Nm
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system call is designed specifically for the
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.Tn NFS
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support daemons and as such is specific to their requirements.
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It should really return values to indicate the need for authentication
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support, since
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.Er ENEEDAUTH
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is not really an error.
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Several fields of the argument structures are assumed to be valid and
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sometimes to be unchanged from a previous call, such that
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.Nm
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must be used with extreme care.
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