476 lines
9.6 KiB
C
476 lines
9.6 KiB
C
/* $NetBSD: nfs.c,v 1.8 1995/07/03 04:56:33 gwr 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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/* Define our own NFS attributes without NQNFS stuff. */
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struct nfsv2_fattrs {
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n_long fa_type;
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n_long fa_mode;
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n_long fa_nlink;
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n_long fa_uid;
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n_long fa_gid;
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n_long fa_size;
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n_long fa_blocksize;
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n_long fa_rdev;
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n_long fa_blocks;
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n_long fa_fsid;
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n_long fa_fileid;
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struct nfsv2_time fa_atime;
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struct nfsv2_time fa_mtime;
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struct nfsv2_time fa_ctime;
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};
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struct nfs_read_args {
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u_char fh[NFS_FHSIZE];
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n_long off;
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n_long len;
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n_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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#define NFSREAD_SIZE 1024
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struct nfs_read_repl {
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n_long errno;
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struct nfsv2_fattrs fa;
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n_long count;
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u_char data[NFSREAD_SIZE];
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};
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struct nfs_iodesc {
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struct iodesc *iodesc;
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off_t off;
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u_char fh[NFS_FHSIZE];
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struct nfsv2_fattrs fa; /* all in network order */
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};
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struct nfs_iodesc nfs_root_node;
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/* Fetch the root file handle (call mount daemon) */
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int
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nfs_getrootfh(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 args {
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n_long len;
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char path[FNAME_SIZE];
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} *args;
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struct repl {
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n_long errno;
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u_char fh[NFS_FHSIZE];
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} *repl;
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struct {
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n_long h[RPC_HEADER_WORDS];
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struct args d;
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} sdata;
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struct {
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n_long h[RPC_HEADER_WORDS];
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struct repl d;
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} rdata;
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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("nfs_getrootfh: %s\n", path);
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#endif
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args = &sdata.d;
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repl = &rdata.d;
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bzero(args, sizeof(*args));
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len = strlen(path);
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if (len > sizeof(args->path))
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len = sizeof(args->path);
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args->len = htonl(len);
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bcopy(path, args->path, len);
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len = 4 + roundup(len, 4);
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cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT,
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args, len, repl, sizeof(*repl));
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if (cc < 4)
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return (-1);
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if (repl->errno) {
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errno = ntohl(repl->errno);
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return (-1);
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}
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bcopy(repl->fh, fhp, sizeof(repl->fh));
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return (0);
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}
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/* Lookup a file. Return handle and attributes. */
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int
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nfs_lookupfh(d, name, newfd)
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struct nfs_iodesc *d;
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char *name;
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struct nfs_iodesc *newfd;
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{
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register int len, rlen;
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struct args {
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u_char fh[NFS_FHSIZE];
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n_long len;
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char name[FNAME_SIZE];
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} *args;
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struct repl {
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n_long errno;
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u_char fh[NFS_FHSIZE];
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struct nfsv2_fattrs fa;
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} *repl;
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struct {
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n_long h[RPC_HEADER_WORDS];
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struct args d;
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} sdata;
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struct {
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n_long h[RPC_HEADER_WORDS];
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struct repl d;
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} rdata;
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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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args = &sdata.d;
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repl = &rdata.d;
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bzero(args, sizeof(*args));
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bcopy(d->fh, args->fh, sizeof(args->fh));
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len = strlen(name);
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if (len > sizeof(args->name))
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len = sizeof(args->name);
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bcopy(name, args->name, len);
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args->len = htonl(len);
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len = 4 + roundup(len, 4);
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len += NFS_FHSIZE;
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rlen = sizeof(*repl);
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cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_LOOKUP,
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args, len, repl, rlen);
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if (cc < 4)
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return (EIO);
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if (repl->errno) {
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/* XXX - saerrno.h should match errno.h and RPC! */
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printf("nfs_lookup: \"%s\" error=%d\n",
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name, ntohl(repl->errno));
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return (ENOENT);
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}
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bcopy( repl->fh, &newfd->fh, sizeof(newfd->fh));
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bcopy(&repl->fa, &newfd->fa, sizeof(newfd->fa));
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return (0);
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}
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/* Read data from a file */
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size_t
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nfs_readdata(d, off, addr, len)
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struct nfs_iodesc *d;
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off_t off;
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void *addr;
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size_t len;
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{
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struct nfs_read_args *args;
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struct nfs_read_repl *repl;
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struct {
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n_long h[RPC_HEADER_WORDS];
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struct nfs_read_args d;
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} sdata;
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struct {
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n_long h[RPC_HEADER_WORDS];
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struct nfs_read_repl d;
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} rdata;
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size_t cc;
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int hlen, rlen, x;
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args = &sdata.d;
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repl = &rdata.d;
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bcopy(d->fh, args->fh, NFS_FHSIZE);
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args->off = txdr_unsigned(off);
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if (len > NFSREAD_SIZE)
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len = NFSREAD_SIZE;
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args->len = txdr_unsigned(len);
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args->xxx = txdr_unsigned(0);
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hlen = sizeof(*repl) - NFSREAD_SIZE;
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cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READ,
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args, sizeof(*args),
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repl, sizeof(*repl));
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if (cc < hlen)
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return (-1);
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if (repl->errno) {
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errno = ntohl(repl->errno);
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return (-1);
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}
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rlen = cc - hlen;
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x = ntohl(repl->count);
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if (rlen < x) {
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printf("nfsread: short packet, %d < %d\n", rlen, x);
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return(-1);
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}
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bcopy(repl->data, addr, x);
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return (x);
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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 nfsv2_fattrs *fa;
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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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/* Bind to a reserved port. */
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desc->myport = htons(--rpc_port);
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desc->destip = ip;
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if (nfs_getrootfh(desc, path, nfs_root_node.fh))
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return (-1);
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nfs_root_node.iodesc = desc;
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/* Fake up attributes for the root dir. */
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fa = &nfs_root_node.fa;
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fa->fa_type = htonl(NFDIR);
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fa->fa_mode = htonl(0755);
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fa->fa_nlink = htonl(2);
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#ifdef NFS_DEBUG
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if (debug)
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printf("nfs_mount: got fh for %s\n", path);
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#endif
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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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struct nfs_iodesc *newfd;
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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 (nfs_root_node.iodesc == NULL) {
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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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newfd = alloc(sizeof(*newfd));
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newfd->iodesc = nfs_root_node.iodesc;
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newfd->off = 0;
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/* lookup a file handle */
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rc = nfs_lookupfh(&nfs_root_node, path, newfd);
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if (rc) {
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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",
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path, strerror(errno));
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#endif
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free(newfd, sizeof(*newfd));
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return(rc);
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}
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f->f_fsdata = (void *)newfd;
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#ifdef NFS_DEBUG
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if (debug)
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printf("nfs_open: \"%s\", type=%d size=%d\n", path,
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ntohl(newfd->fa.fa_type),
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ntohl(newfd->fa.fa_size));
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#endif
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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: fp=0x%x\n", fp);
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#endif
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if (fp)
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free(fp, sizeof(struct nfs_iodesc));
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f->f_fsdata = (void *)0;
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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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twiddle();
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cc = nfs_readdata(fp, 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 *d = (struct nfs_iodesc *)f->f_fsdata;
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n_long size = ntohl(d->fa.fa_size);
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switch (where) {
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case SEEK_SET:
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d->off = offset;
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break;
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case SEEK_CUR:
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d->off += offset;
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break;
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case SEEK_END:
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d->off = 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 (d->off);
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}
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/* NFNON=0, NFREG=1, NFDIR=2, NFBLK=3, NFCHR=4, NFLNK=5 */
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int nfs_stat_types[8] = {
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0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 0 };
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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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struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
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register n_long ftype, mode;
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ftype = ntohl(fp->fa.fa_type);
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mode = ntohl(fp->fa.fa_mode);
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mode |= nfs_stat_types[ftype & 7];
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sb->st_mode = mode;
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sb->st_nlink = ntohl(fp->fa.fa_nlink);
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sb->st_uid = ntohl(fp->fa.fa_uid);
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sb->st_gid = ntohl(fp->fa.fa_gid);
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sb->st_size = ntohl(fp->fa.fa_size);
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return (0);
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}
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