517 lines
11 KiB
C
517 lines
11 KiB
C
/* $NetBSD: nfs.c,v 1.6 1995/02/20 11:04:12 mycroft Exp $ */
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/*-
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* Copyright (c) 1993 John Brezak
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* 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. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsv2.h>
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#include <nfs/xdr_subs.h>
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#include "stand.h"
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#include "net.h"
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#include "netif.h"
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#include "nfs.h"
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#include "rpc.h"
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struct nfs_call_data {
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u_char fh[NFS_FHSIZE];
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u_long off;
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u_long len;
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u_long xxx; /* XXX what's this for? */
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};
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/* Data part of nfs rpc reply (also the largest thing we receive) */
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struct nfs_reply_data {
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u_long errno;
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struct nfsv2_fattr fa;
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u_long count;
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u_char data[1200];
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};
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#define NFSREAD_SIZE sizeof(((struct nfs_reply_data *)0)->data)
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struct nfs_iodesc {
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off_t off;
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size_t size;
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u_char *fh;
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struct iodesc *iodesc;
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};
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/* Fetch (mount) file handle */
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static int
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getmountfh(d, path, fhp)
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register struct iodesc *d;
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char *path;
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u_char *fhp;
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{
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register int len;
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struct {
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u_long len;
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char path[FNAME_SIZE];
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} wbuf;
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struct {
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u_long errno;
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u_char fh[NFS_FHSIZE];
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} rbuf;
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size_t cc;
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#ifdef NFS_DEBUG
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if (debug)
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printf("getmountfh: called\n");
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#endif
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bzero(&wbuf, sizeof(wbuf));
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len = strlen(path);
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if (len > sizeof(wbuf.path))
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len = sizeof(wbuf.path);
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bcopy(path, wbuf.path, len);
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wbuf.len = htonl(len);
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len = sizeof(wbuf) - sizeof(wbuf.path) + roundup(len, sizeof(long));
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if ((cc = callrpc(d, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT,
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&wbuf, len, &rbuf, sizeof(rbuf))) == -1)
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return (-1);
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if (cc < sizeof(rbuf.errno))
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panic("getmountfh: callrpc small read");
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if (rbuf.errno) {
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errno = ntohl(rbuf.errno);
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return (-1);
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}
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bcopy(rbuf.fh, fhp, sizeof(rbuf.fh));
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return (0);
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}
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/* Fetch file timestamp and size */
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static int
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getnfsinfo(d, tp, sp, fp, mp, up, gp)
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register struct nfs_iodesc *d;
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register time_t *tp;
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u_long *sp, *fp;
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mode_t *mp;
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uid_t *up;
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gid_t *gp;
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{
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register int rlen;
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register u_long t;
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struct {
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u_long errno;
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struct nfsv2_fattr fa;
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} rbuf;
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size_t cc;
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#ifdef NFS_DEBUG
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if (debug)
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printf("getnfsinfo: called\n");
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#endif
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rlen = sizeof(rbuf);
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#if NFSX_FATTR(1) > NFSX_FATTR(0)
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/* nqnfs makes this more painful than it needs to be */
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rlen -= NFSX_FATTR(1) - NFSX_FATTR(0);
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#endif
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if ((cc = callrpc(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_GETATTR,
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d->fh, NFS_FHSIZE, &rbuf, rlen)) == -1)
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return (-1);
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if (cc < sizeof(rbuf.errno))
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panic("getnfsinfo: callrpc small read");
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if (rbuf.errno) {
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errno = ntohl(rbuf.errno);
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return (-1);
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}
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if (tp) {
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*tp = ntohl(rbuf.fa.fa_nfsmtime.nfs_sec);
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t = ntohl(rbuf.fa.fa_nfsatime.nfs_sec);
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if (*tp < t)
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*tp = t;
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}
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if (sp)
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*sp = ntohl(rbuf.fa.fa_nfssize);
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if (fp)
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*fp = ntohl(rbuf.fa.fa_type);
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if (mp)
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*mp = ntohl(rbuf.fa.fa_mode);
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if (up)
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*up = ntohl(rbuf.fa.fa_uid);
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if (gp)
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*gp = ntohl(rbuf.fa.fa_gid);
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return(0);
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}
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/* Lookup a file. Optionally return timestamp and size */
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static int
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lookupfh(d, name, fhp, tp, sp, fp)
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struct nfs_iodesc *d;
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char *name;
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u_char *fhp;
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time_t *tp;
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u_long *sp, *fp;
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{
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register int len, rlen;
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struct {
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u_char fh[NFS_FHSIZE];
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u_long len;
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char name[FNAME_SIZE];
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} wbuf;
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struct {
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u_long errno;
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u_char fh[NFS_FHSIZE];
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struct nfsv2_fattr fa;
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} rbuf;
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size_t cc;
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#ifdef NFS_DEBUG
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if (debug)
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printf("lookupfh: called\n");
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#endif
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bzero(&wbuf, sizeof(wbuf));
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bcopy(d->fh, wbuf.fh, sizeof(wbuf.fh));
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len = strlen(name);
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if (len > sizeof(wbuf.name))
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len = sizeof(wbuf.name);
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bcopy(name, wbuf.name, len);
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wbuf.len = htonl(len);
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len = sizeof(wbuf) - sizeof(wbuf.name) + roundup(len, sizeof(long));
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rlen = sizeof(rbuf);
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#ifdef NFSX_FATTR
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#if NFSX_FATTR(1) > NFSX_FATTR(0)
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/* nqnfs makes this more painful than it needs to be */
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rlen -= NFSX_FATTR(1) - NFSX_FATTR(0);
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#endif
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#endif
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if ((cc = callrpc(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_LOOKUP,
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&wbuf, len, &rbuf, rlen)) == -1)
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return (-1);
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if (cc < sizeof(rbuf.errno))
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panic("lookupfh: callrpc small read");
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if (rbuf.errno) {
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errno = ntohl(rbuf.errno);
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return (-1);
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}
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bcopy(rbuf.fh, fhp, sizeof(rbuf.fh));
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if (tp)
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*tp = ntohl(rbuf.fa.fa_nfsctime.nfs_sec);
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if (sp)
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*sp = ntohl(rbuf.fa.fa_nfssize);
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if (fp)
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*fp = ntohl(rbuf.fa.fa_type);
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return (0);
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}
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/* Read data from a file */
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static size_t
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readdata(d, off, addr, len)
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register struct nfs_iodesc *d;
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register off_t off;
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register void *addr;
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register size_t len;
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{
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size_t cc;
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struct nfs_call_data wbuf;
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struct nfs_reply_data rbuf;
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bcopy(d->fh, wbuf.fh, NFS_FHSIZE);
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wbuf.off = txdr_unsigned(off);
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if (len > NFSREAD_SIZE)
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len = NFSREAD_SIZE;
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wbuf.len = txdr_unsigned(len);
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wbuf.xxx = txdr_unsigned(0);
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cc = callrpc(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READ,
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&wbuf, sizeof(wbuf),
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&rbuf, sizeof(rbuf) - NFSREAD_SIZE + len);
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if (cc == -1 || cc < sizeof(rbuf) - NFSREAD_SIZE)
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return (-1);
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cc -= sizeof(rbuf) - NFSREAD_SIZE;
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bcopy(rbuf.data, addr, cc);
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return (cc);
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}
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static struct iodesc *mountfs;
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static u_char mountfh[NFS_FHSIZE];
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static time_t mounttime;
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/*
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* nfs_mount - mount this nfs filesystem to a host
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*/
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int
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nfs_mount(sock, ip, path)
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int sock;
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n_long ip;
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char *path;
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{
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struct iodesc *desc;
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struct nfs_iodesc *fp;
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u_long ftype;
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if (!(desc = socktodesc(sock))) {
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errno = EINVAL;
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return(-1);
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}
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bcopy(&desc->myea[4], &desc->myport, 2);
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desc->destip = ip;
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getmountfh(desc, path, mountfh);
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fp = alloc(sizeof(struct nfs_iodesc));
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fp->iodesc = desc;
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fp->fh = mountfh;
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fp->off = 0;
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if (getnfsinfo(fp, &mounttime, NULL, &ftype, NULL, NULL, NULL) < 0) {
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free(fp, sizeof(struct nfs_iodesc));
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return(-1);
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}
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if (ftype != NFDIR) {
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free(fp, sizeof(struct nfs_iodesc));
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errno = EINVAL;
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printf("nfs_mount: bad mount ftype %d", ftype);
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return(-1);
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}
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#ifdef NFS_DEBUG
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if (debug)
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printf("nfs_mount: got fh for %s, mtime=%d, ftype=%d\n",
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path, mounttime, ftype);
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#endif
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mountfs = desc;
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free(fp, sizeof(struct nfs_iodesc));
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return(0);
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}
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/*
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* Open a file.
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*/
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int
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nfs_open(path, f)
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char *path;
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struct open_file *f;
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{
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register struct nfs_iodesc *fp;
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u_char *imagefh;
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u_long size, ftype;
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int rc = 0;
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#ifdef NFS_DEBUG
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if (debug)
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printf("nfs_open: %s\n", path);
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#endif
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if (!mountfs) {
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errno = EIO;
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printf("nfs_open: must mount first.\n");
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return(-1);
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}
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/* allocate file system specific data structure */
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fp = alloc(sizeof(struct nfs_iodesc));
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fp->iodesc = mountfs;
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fp->fh = mountfh;
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fp->off = 0;
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f->f_fsdata = (void *)fp;
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imagefh = alloc(NFS_FHSIZE);
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bzero(imagefh, NFS_FHSIZE);
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/* lookup a file handle */
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rc = lookupfh(fp, path, imagefh, NULL, &size, &ftype);
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if (rc < 0) {
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#ifdef NFS_DEBUG
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if (debug)
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printf("nfs_open: %s lookupfh failed: %s\n", path, strerror(errno));
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#endif
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f->f_fsdata = (void *)0;
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free(fp, sizeof(struct nfs_iodesc));
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free(imagefh, NFS_FHSIZE);
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return(rc);
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}
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fp->fh = imagefh;
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#ifdef NFS_DEBUG
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if (debug)
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printf("nfs_open: %s success, size=%d ftype=%d\n",
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path, size, ftype);
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#endif
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fp->size = size;
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return(rc);
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}
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int
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nfs_close(f)
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struct open_file *f;
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{
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register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
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#ifdef NFS_DEBUG
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if (debug)
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printf("nfs_close: called\n");
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#endif
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f->f_fsdata = (void *)0;
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if (fp == (struct nfs_iodesc *)0)
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return (0);
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free(fp->fh, NFS_FHSIZE);
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free(fp, sizeof(struct nfs_iodesc));
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return (0);
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}
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/*
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* read a portion of a file
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*/
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int
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nfs_read(f, addr, size, resid)
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struct open_file *f;
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char *addr;
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u_int size;
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u_int *resid; /* out */
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{
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register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
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register size_t cc;
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#ifdef NFS_DEBUG
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if (debug)
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printf("nfs_read: size=%d off=%d\n", size, (int)fp->off);
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#endif
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while (size > 0) {
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cc = readdata(fp->iodesc, fp->off, (void *)addr, size);
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/* XXX maybe should retry on certain errors */
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if (cc == -1) {
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#ifdef NFS_DEBUG
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if (debug)
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printf("nfs_read: read: %s", strerror(errno));
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#endif
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return (-1);
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}
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if (cc == 0) {
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if (debug)
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printf("nfs_read: hit EOF unexpectantly");
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goto ret;
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}
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fp->off += cc;
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addr += cc;
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size -= cc;
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}
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ret:
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if (resid)
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*resid = size;
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return (0);
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}
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/*
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* Not implemented.
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*/
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int
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nfs_write(f, start, size, resid)
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struct open_file *f;
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char *start;
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u_int size;
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u_int *resid; /* out */
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{
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errno = EROFS;
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return (-1);
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}
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off_t
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nfs_seek(f, offset, where)
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struct open_file *f;
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off_t offset;
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int where;
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{
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register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
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switch (where) {
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case SEEK_SET:
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fp->off = offset;
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break;
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case SEEK_CUR:
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fp->off += offset;
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break;
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case SEEK_END:
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fp->off = fp->size - offset;
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break;
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default:
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return (-1);
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}
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return (fp->off);
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}
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int
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nfs_stat(f, sb)
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struct open_file *f;
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struct stat *sb;
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{
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register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
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mode_t mode = 0;
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u_long ftype = 0;
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#ifdef NFS_DEBUG
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if (debug)
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printf("nfs_stat: called\n");
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#endif
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if (getnfsinfo(fp, &mounttime, &sb->st_size, &ftype, &mode, &sb->st_uid, &sb->st_gid) < 0)
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return(-1);
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/* create a mode */
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switch (ftype) {
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case NFNON:
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sb->st_mode = 0;
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break;
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case NFREG:
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sb->st_mode = S_IFREG;
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break;
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case NFDIR:
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sb->st_mode = S_IFDIR;
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break;
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case NFBLK:
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sb->st_mode = S_IFBLK;
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break;
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case NFCHR:
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sb->st_mode = S_IFCHR;
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break;
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case NFLNK:
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sb->st_mode = S_IFLNK;
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break;
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}
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sb->st_mode |= mode;
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return (0);
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}
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