721 lines
15 KiB
C
721 lines
15 KiB
C
/*-
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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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* $Id: nfs.c,v 1.2 1994/06/20 07:50:17 glass Exp $
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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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#undef NFSX_FATTR
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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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#ifndef NFSX_FATTR
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struct nfsv2_fattr fa;
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#else
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u_char fa[NFSX_FATTR(0)];
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#endif
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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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/* max number of nfs reads pending */
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#define NFS_COUNT 10
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static struct nfsstate {
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u_long off;
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u_long len;
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int done;
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void *addr;
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u_long xid;
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} nfsstate[NFS_COUNT];
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static u_long nfscc;
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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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} sdata;
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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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} rdata;
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int 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(&sdata, sizeof(sdata));
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len = strlen(path);
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if (len > sizeof(sdata.path))
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len = sizeof(sdata.path);
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bcopy(path, sdata.path, len);
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sdata.len = htonl(len);
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len = sizeof(sdata) - sizeof(sdata.path) + roundup(len, sizeof(long));
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if ((cc = callrpc(d, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT,
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&sdata, len, &rdata, sizeof(rdata))) < 0)
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return(-1);
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if (cc < sizeof(rdata.errno))
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panic("getmountfh: callrpc small read");
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if (rdata.errno) {
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errno = ntohl(rdata.errno);
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return(-1);
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}
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bcopy(rdata.fh, fhp, sizeof(rdata.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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} rdata;
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int 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(rdata);
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#if 0
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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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#endif
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if ((cc = callrpc(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_GETATTR,
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d->fh, NFS_FHSIZE, &rdata, rlen)) < 0)
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return(-1);
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if (cc < sizeof(rdata.errno))
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panic("getnfsinfo: callrpc small read");
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if (rdata.errno) {
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errno = ntohl(rdata.errno);
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return(-1);
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}
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if (tp) {
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*tp = ntohl(rdata.fa.fa_nfsmtime.nfs_sec);
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t = ntohl(rdata.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(rdata.fa.fa_nfssize);
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if (fp)
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*fp = ntohl(rdata.fa.fa_type);
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if (mp)
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*mp = ntohl(rdata.fa.fa_mode);
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if (up)
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*up = ntohl(rdata.fa.fa_uid);
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if (gp)
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*gp = ntohl(rdata.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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} sdata;
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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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} rdata;
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int 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(&sdata, sizeof(sdata));
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bcopy(d->fh, sdata.fh, sizeof(sdata.fh));
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len = strlen(name);
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if (len > sizeof(sdata.name))
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len = sizeof(sdata.name);
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bcopy(name, sdata.name, len);
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sdata.len = htonl(len);
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len = sizeof(sdata) - sizeof(sdata.name) + roundup(len, sizeof(long));
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rlen = sizeof(rdata);
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#if 0
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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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#endif
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if ((cc = callrpc(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_LOOKUP,
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&sdata, len, &rdata, rlen)) < 0)
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return (-1);
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if (cc < sizeof(rdata.errno))
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panic("lookupfh: callrpc small read");
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if (rdata.errno) {
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errno = ntohl(rdata.errno);
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return(-1);
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}
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bcopy(rdata.fh, fhp, sizeof(rdata.fh));
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if (tp)
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*tp = ntohl(rdata.fa.fa_nfsctime.nfs_sec);
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if (sp)
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*sp = ntohl(rdata.fa.fa_nfssize);
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if (fp)
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*fp = ntohl(rdata.fa.fa_type);
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return (0);
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}
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static int
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sendreaddata(d, pkt, len)
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register struct nfs_iodesc *d;
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register void *pkt;
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register int len;
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{
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register int i;
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register u_long cc;
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register struct rpc_call *rpc;
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register struct nfs_call_data *nfs;
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register struct nfsstate *ns;
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#ifdef NFS_DEBUG
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if (debug)
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printf("sendreaddata: called\n");
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#endif
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if (len != sizeof(*rpc) + sizeof(*nfs))
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panic("sendreaddata: bad buffer (%d != %d)",
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len, sizeof(*rpc) + sizeof(*nfs));
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rpc = pkt;
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nfs = (struct nfs_call_data *)(rpc + 1);
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for (i = 0, ns = nfsstate; i < NFS_COUNT; ++i, ++ns) {
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if (ns->done)
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continue;
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rpc->rp_xid = ns->xid;
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nfs->off = htonl(ns->off);
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nfs->len = htonl(ns->len);
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cc = sendudp(d->iodesc, rpc, len);
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if (cc != len)
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panic("sendreaddata: short write (%d != %d)", cc, len);
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}
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/* XXX we may have actually sent a lot more bytes... */
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return (len);
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}
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/* Returns char count if done else -1 (and errno == 0) */
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static int
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recvreaddata(d, pkt, len)
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register struct nfs_iodesc *d;
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register void *pkt;
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int len;
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{
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register int i;
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register struct rpc_reply *rpc;
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register struct nfs_reply_data *nfs;
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register struct nfsstate *ns;
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#ifdef NFS_DEBUG
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if (debug)
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printf("recvreaddata: called\n");
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#endif
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rpc = (struct rpc_reply *)checkudp(d->iodesc, pkt, &len);
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if (rpc == NULL || len < sizeof(*rpc)) {
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errno = 0;
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return (-1);
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}
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len -= sizeof(*rpc);
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NTOHL(rpc->rp_direction);
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NTOHL(rpc->rp_stat);
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if (rpc->rp_direction != REPLY || rpc->rp_stat != MSG_ACCEPTED) {
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errno = 0;
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return (-1);
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}
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for (i = 0, ns = nfsstate; i < NFS_COUNT; ++i, ++ns)
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if (rpc->rp_xid == ns->xid)
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break;
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if (i >= NFS_COUNT) {
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errno = 0;
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return (-1);
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}
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if (ns->done) {
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errno = 0;
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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("recvreaddata: ns=%x\n", (u_int)ns);
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#endif
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nfs = (struct nfs_reply_data *)(rpc + 1);
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if (len < sizeof(nfs->errno))
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panic("recvreaddata: bad read %d", len);
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if (nfs->errno) {
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errno = ntohl(nfs->errno);
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return (-1);
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}
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if (len < sizeof(*nfs) - sizeof(nfs->data))
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panic("recvreaddata: less than nfs sized %d", len);
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len -= sizeof(*nfs) - sizeof(nfs->data);
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if (len < nfs->count)
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panic("recvreaddata: short read (%d < %d)", len, nfs->count);
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len = nfs->count;
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if (len > ns->len)
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panic("recvreaddata: huge read (%d > %d)", len, ns->len);
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#ifdef NFS_DEBUG
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if (debug)
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printf("recvreaddata: read %d bytes.\n", len);
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#endif
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bcopy(nfs->data, ns->addr, len);
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ns->done = 1;
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nfscc += len;
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if (len < ns->len) {
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/* If first packet assume no more data to read */
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if (i == 0)
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return (0);
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/* Short read, assume we are at EOF */
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++i;
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++ns;
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while (i < NFS_COUNT) {
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ns->done = 1;
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++i;
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++ns;
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}
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}
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for (i = 0, ns = nfsstate; i < NFS_COUNT; ++i, ++ns)
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if (!ns->done) {
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errno = 0;
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return (-1);
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}
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/* Return data count (thus indicating success) */
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return (nfscc);
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}
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/* Read data from a file */
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static int
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readdata(d, off, addr, len)
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register struct nfs_iodesc *d;
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register u_long off;
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register void *addr;
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register u_long len;
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{
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register int i, cc;
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register struct rpc_call *rpc;
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register struct nfsstate *ns;
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struct {
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u_char header[HEADER_SIZE];
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struct rpc_call rpc;
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struct nfs_call_data nfs;
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} sdata;
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struct {
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u_char header[HEADER_SIZE];
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struct rpc_call rpc;
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struct nfs_reply_data nfs;
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} rdata;
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#ifdef NFS_DEBUG
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if (debug)
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printf("readdata: addr=%x, off=%d len=%d\n", (u_int)addr, off, len);
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#endif
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if (len == 0)
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return (0);
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d->iodesc->destport = getport(d->iodesc, NFS_PROG, NFS_VER2);
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bzero(&sdata, sizeof(sdata));
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for (i = 0, ns = nfsstate; i < NFS_COUNT; ++i, ++ns) {
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if (len <= 0) {
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ns->done = 1;
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continue;
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}
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ns->done = 0;
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ns->xid = d->iodesc->xid;
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++d->iodesc->xid;
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ns->off = off;
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ns->len = len;
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if (ns->len > NFSREAD_SIZE)
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ns->len = NFSREAD_SIZE;
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#ifdef notdef
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/* XXX to align or not align? It doesn't seem to speed things up... */
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if ((ns->off % NFSREAD_SIZE) != 0)
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ns->len -= off % NFSREAD_SIZE;
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#endif
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off += ns->len;
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len -= ns->len;
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ns->addr = addr;
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addr += NFSREAD_SIZE;
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}
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rpc = &sdata.rpc;
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rpc->rp_rpcvers = htonl(RPC_MSG_VERSION);
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rpc->rp_prog = htonl(NFS_PROG);
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rpc->rp_vers = htonl(NFS_VER2);
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rpc->rp_proc = htonl(NFSPROC_READ);
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bcopy(d->fh, sdata.nfs.fh, sizeof(sdata.nfs.fh));
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nfscc = 0;
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cc = sendrecv(d->iodesc,
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sendreaddata, &sdata.rpc,
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sizeof(struct rpc_call) + sizeof(struct nfs_call_data),
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recvreaddata,
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((u_char *)&rdata.rpc) - HEADER_SIZE, HEADER_SIZE +
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sizeof(struct rpc_call) + sizeof(struct nfs_reply_data));
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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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/*
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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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|
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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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*/
|
|
int
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nfs_open(path, f)
|
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char *path;
|
|
struct open_file *f;
|
|
{
|
|
register struct nfs_iodesc *fp;
|
|
u_char *imagefh;
|
|
u_long size, ftype;
|
|
int rc = 0;
|
|
|
|
#ifdef NFS_DEBUG
|
|
if (debug)
|
|
printf("nfs_open: %s\n", path);
|
|
#endif
|
|
if (!mountfs) {
|
|
errno = EIO;
|
|
printf("nfs_open: must mount first.\n");
|
|
return(-1);
|
|
}
|
|
|
|
/* allocate file system specific data structure */
|
|
fp = alloc(sizeof(struct nfs_iodesc));
|
|
fp->iodesc = mountfs;
|
|
fp->fh = mountfh;
|
|
fp->off = 0;
|
|
|
|
f->f_fsdata = (void *)fp;
|
|
imagefh = alloc(NFS_FHSIZE);
|
|
bzero(imagefh, NFS_FHSIZE);
|
|
|
|
/* lookup a file handle */
|
|
rc = lookupfh(fp, path, imagefh, NULL, &size, &ftype);
|
|
if (rc < 0) {
|
|
#ifdef NFS_DEBUG
|
|
if (debug)
|
|
printf("nfs_open: %s lookupfh failed: %s\n", path, strerror(errno));
|
|
#endif
|
|
f->f_fsdata = (void *)0;
|
|
free(fp, sizeof(struct nfs_iodesc));
|
|
free(imagefh, NFS_FHSIZE);
|
|
return(rc);
|
|
}
|
|
fp->fh = imagefh;
|
|
|
|
#ifdef NFS_DEBUG
|
|
if (debug)
|
|
printf("nfs_open: %s success, size=%d ftype=%d\n",
|
|
path, size, ftype);
|
|
#endif
|
|
fp->size = size;
|
|
|
|
return(rc);
|
|
}
|
|
|
|
int
|
|
nfs_close(f)
|
|
struct open_file *f;
|
|
{
|
|
register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
|
|
|
|
#ifdef NFS_DEBUG
|
|
if (debug)
|
|
printf("nfs_close: called\n");
|
|
#endif
|
|
f->f_fsdata = (void *)0;
|
|
if (fp == (struct nfs_iodesc *)0)
|
|
return (0);
|
|
|
|
free(fp->fh, NFS_FHSIZE);
|
|
free(fp, sizeof(struct nfs_iodesc));
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* read a portion of a file
|
|
*/
|
|
int
|
|
nfs_read(f, addr, size, resid)
|
|
struct open_file *f;
|
|
char *addr;
|
|
u_int size;
|
|
u_int *resid; /* out */
|
|
{
|
|
register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
|
|
register int cc;
|
|
|
|
#ifdef NFS_DEBUG
|
|
if (debug)
|
|
printf("nfs_read: size=%d off=%d\n", size, fp->off);
|
|
#endif
|
|
while (size > 0) {
|
|
cc = readdata(fp->iodesc, fp->off, (void *)addr, size);
|
|
if (cc <= 0) {
|
|
/* XXX maybe should retry on certain errors */
|
|
if (cc < 0) {
|
|
#ifdef NFS_DEBUG
|
|
if (debug)
|
|
printf("nfs_read: read: %s",
|
|
strerror(errno));
|
|
#endif
|
|
return (-1);
|
|
}
|
|
if (debug)
|
|
printf("nfs_read: hit EOF unexpectantly");
|
|
goto ret;
|
|
}
|
|
fp->off += cc;
|
|
addr += cc;
|
|
size -= cc;
|
|
}
|
|
ret:
|
|
if (resid)
|
|
*resid = size;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Not implemented.
|
|
*/
|
|
int
|
|
nfs_write(f, start, size, resid)
|
|
struct open_file *f;
|
|
char *start;
|
|
u_int size;
|
|
u_int *resid; /* out */
|
|
{
|
|
errno = EROFS;
|
|
|
|
return (-1);
|
|
}
|
|
|
|
off_t
|
|
nfs_seek(f, offset, where)
|
|
struct open_file *f;
|
|
off_t offset;
|
|
int where;
|
|
{
|
|
register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
|
|
|
|
switch (where) {
|
|
case SEEK_SET:
|
|
fp->off = offset;
|
|
break;
|
|
case SEEK_CUR:
|
|
fp->off += offset;
|
|
break;
|
|
case SEEK_END:
|
|
fp->off = fp->size - offset;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
return (fp->off);
|
|
}
|
|
|
|
int
|
|
nfs_stat(f, sb)
|
|
struct open_file *f;
|
|
struct stat *sb;
|
|
{
|
|
register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
|
|
mode_t mode = 0;
|
|
u_long ftype = 0;
|
|
|
|
#ifdef NFS_DEBUG
|
|
if (debug)
|
|
printf("nfs_stat: called\n");
|
|
#endif
|
|
if (getnfsinfo(fp, &mounttime, &sb->st_size, &ftype, &mode, &sb->st_uid, &sb->st_gid) < 0)
|
|
return(-1);
|
|
|
|
/* create a mode */
|
|
switch (ftype) {
|
|
case NFNON:
|
|
sb->st_mode = 0;
|
|
break;
|
|
case NFREG:
|
|
sb->st_mode = S_IFREG;
|
|
break;
|
|
case NFDIR:
|
|
sb->st_mode = S_IFDIR;
|
|
break;
|
|
case NFBLK:
|
|
sb->st_mode = S_IFBLK;
|
|
break;
|
|
case NFCHR:
|
|
sb->st_mode = S_IFCHR;
|
|
break;
|
|
case NFLNK:
|
|
sb->st_mode = S_IFLNK;
|
|
break;
|
|
}
|
|
sb->st_mode |= mode;
|
|
|
|
return (0);
|
|
}
|