753 lines
15 KiB
C
753 lines
15 KiB
C
/* $NetBSD: nfs.c,v 1.2 1998/01/24 12:43:09 drochner 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/cdefs.h>
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__FBSDID("$FreeBSD$");
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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 "rpcv2.h"
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#include "nfsv2.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 "rpc.h"
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#define NFS_DEBUGxx
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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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#ifndef NFS_NOSYMLINK
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struct nfs_readlnk_repl {
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n_long errno;
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n_long len;
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char path[NFS_MAXPATHLEN];
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};
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#endif
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struct nfs_readdir_args {
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u_char fh[NFS_FHSIZE];
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n_long cookie;
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n_long count;
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};
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struct nfs_readdir_data {
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n_long fileid;
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n_long len;
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char name[0];
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};
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struct nfs_readdir_off {
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n_long cookie;
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n_long follows;
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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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/*
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* XXX interactions with tftp? See nfswrapper.c for a confusing
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* issue.
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*/
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int nfs_open(const char *path, struct open_file *f);
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static int nfs_close(struct open_file *f);
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static int nfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
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static int nfs_write(struct open_file *f, void *buf, size_t size, size_t *resid);
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static off_t nfs_seek(struct open_file *f, off_t offset, int where);
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static int nfs_stat(struct open_file *f, struct stat *sb);
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static int nfs_readdir(struct open_file *f, struct dirent *d);
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struct nfs_iodesc nfs_root_node;
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struct fs_ops nfs_fsops = {
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"nfs",
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nfs_open,
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nfs_close,
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nfs_read,
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nfs_write,
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nfs_seek,
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nfs_stat,
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nfs_readdir
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};
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/*
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* Fetch the root file handle (call mount daemon)
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* Return zero or error number.
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*/
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int
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nfs_getrootfh(d, path, fhp)
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struct iodesc *d;
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char *path;
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u_char *fhp;
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{
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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 == -1) {
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/* errno was set by rpc_call */
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return (errno);
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}
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if (cc < 4)
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return (EBADRPC);
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if (repl->errno)
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return (ntohl(repl->errno));
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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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/*
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* Lookup a file. Store handle and attributes.
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* Return zero or error number.
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*/
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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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const char *name;
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struct nfs_iodesc *newfd;
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{
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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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ssize_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 == -1)
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return (errno); /* XXX - from rpc_call */
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if (cc < 4)
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return (EIO);
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if (repl->errno) {
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/* saerrno.h now matches NFS error numbers. */
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return (ntohl(repl->errno));
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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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#ifndef NFS_NOSYMLINK
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/*
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* Get the destination of a symbolic link.
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*/
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int
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nfs_readlink(d, buf)
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struct nfs_iodesc *d;
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char *buf;
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{
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struct {
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n_long h[RPC_HEADER_WORDS];
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u_char fh[NFS_FHSIZE];
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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_readlnk_repl d;
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} rdata;
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ssize_t cc;
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#ifdef NFS_DEBUG
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if (debug)
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printf("readlink: called\n");
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#endif
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bcopy(d->fh, sdata.fh, NFS_FHSIZE);
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cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READLINK,
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sdata.fh, NFS_FHSIZE,
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&rdata.d, sizeof(rdata.d));
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if (cc == -1)
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return (errno);
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if (cc < 4)
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return (EIO);
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if (rdata.d.errno)
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return (ntohl(rdata.d.errno));
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rdata.d.len = ntohl(rdata.d.len);
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if (rdata.d.len > NFS_MAXPATHLEN)
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return (ENAMETOOLONG);
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bcopy(rdata.d.path, buf, rdata.d.len);
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buf[rdata.d.len] = 0;
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return (0);
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}
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#endif
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/*
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* Read data from a file.
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* Return transfer count or -1 (and set errno)
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*/
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ssize_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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long x;
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int hlen, rlen;
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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 = htonl((n_long)off);
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if (len > NFSREAD_SIZE)
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len = NFSREAD_SIZE;
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args->len = htonl((n_long)len);
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args->xxx = htonl((n_long)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 == -1) {
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/* errno was already set by rpc_call */
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return (-1);
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}
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if (cc < hlen) {
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errno = EBADRPC;
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return (-1);
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}
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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 < %ld\n", rlen, x);
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errno = EBADRPC;
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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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* Open a file.
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* return zero or error number
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*/
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int
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nfs_open(upath, f)
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const char *upath;
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struct open_file *f;
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{
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struct iodesc *desc;
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struct nfs_iodesc *currfd;
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#ifndef NFS_NOSYMLINK
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struct nfs_iodesc *newfd;
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struct nfsv2_fattrs *fa;
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char *cp, *ncp;
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int c;
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char namebuf[NFS_MAXPATHLEN + 1];
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char linkbuf[NFS_MAXPATHLEN + 1];
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int nlinks = 0;
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#endif
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int error;
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char *path;
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#ifdef NFS_DEBUG
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if (debug)
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printf("nfs_open: %s (rootpath=%s)\n", path, rootpath);
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#endif
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if (!rootpath[0]) {
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printf("no rootpath, no nfs\n");
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return (ENXIO);
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}
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#ifdef __sparc64__
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if (strcmp(f->f_dev->dv_name, "net") != 0)
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return(EINVAL);
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#endif
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if (!(desc = socktodesc(*(int *)(f->f_devdata))))
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return(EINVAL);
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/* Bind to a reserved port. */
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desc->myport = htons(--rpc_port);
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desc->destip = rootip;
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if ((error = nfs_getrootfh(desc, rootpath, nfs_root_node.fh)))
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return (error);
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nfs_root_node.iodesc = desc;
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#ifndef NFS_NOSYMLINK
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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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currfd = &nfs_root_node;
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newfd = 0;
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cp = path = strdup(upath);
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if (path == NULL) {
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error = ENOMEM;
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goto out;
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}
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while (*cp) {
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/*
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* Remove extra separators
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*/
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while (*cp == '/')
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cp++;
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if (*cp == '\0')
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break;
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/*
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* Check that current node is a directory.
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*/
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if (currfd->fa.fa_type != htonl(NFDIR)) {
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error = ENOTDIR;
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goto out;
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}
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/* allocate file system specific data structure */
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newfd = malloc(sizeof(*newfd));
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newfd->iodesc = currfd->iodesc;
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newfd->off = 0;
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/*
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* Get next component of path name.
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*/
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{
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int len = 0;
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ncp = cp;
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while ((c = *cp) != '\0' && c != '/') {
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if (++len > NFS_MAXNAMLEN) {
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error = ENOENT;
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goto out;
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}
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cp++;
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}
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*cp = '\0';
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}
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/* lookup a file handle */
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error = nfs_lookupfh(currfd, ncp, newfd);
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*cp = c;
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if (error)
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goto out;
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/*
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* Check for symbolic link
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*/
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if (newfd->fa.fa_type == htonl(NFLNK)) {
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int link_len, len;
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error = nfs_readlink(newfd, linkbuf);
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if (error)
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goto out;
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link_len = strlen(linkbuf);
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len = strlen(cp);
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if (link_len + len > MAXPATHLEN
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|| ++nlinks > MAXSYMLINKS) {
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error = ENOENT;
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goto out;
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}
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bcopy(cp, &namebuf[link_len], len + 1);
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bcopy(linkbuf, namebuf, link_len);
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/*
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* If absolute pathname, restart at root.
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* If relative pathname, restart at parent directory.
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*/
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cp = namebuf;
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if (*cp == '/') {
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if (currfd != &nfs_root_node)
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free(currfd);
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currfd = &nfs_root_node;
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}
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free(newfd);
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newfd = 0;
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continue;
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}
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if (currfd != &nfs_root_node)
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free(currfd);
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currfd = newfd;
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newfd = 0;
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}
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error = 0;
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out:
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if (newfd)
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free(newfd);
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if (path)
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free(path);
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#else
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/* allocate file system specific data structure */
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currfd = malloc(sizeof(*currfd));
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currfd->iodesc = desc;
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currfd->off = 0;
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error = nfs_lookupfh(&nfs_root_node, upath, currfd);
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#endif
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if (!error) {
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f->f_fsdata = (void *)currfd;
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return (0);
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}
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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(error));
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#endif
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#ifndef NFS_NOSYMLINK
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if (currfd != &nfs_root_node)
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#endif
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free(currfd);
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|
|
|
return (error);
|
|
}
|
|
|
|
int
|
|
nfs_close(f)
|
|
struct open_file *f;
|
|
{
|
|
struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
|
|
|
|
#ifdef NFS_DEBUG
|
|
if (debug)
|
|
printf("nfs_close: fp=0x%lx\n", (u_long)fp);
|
|
#endif
|
|
|
|
if (fp != &nfs_root_node && fp)
|
|
free(fp);
|
|
f->f_fsdata = (void *)0;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* read a portion of a file
|
|
*/
|
|
int
|
|
nfs_read(f, buf, size, resid)
|
|
struct open_file *f;
|
|
void *buf;
|
|
size_t size;
|
|
size_t *resid; /* out */
|
|
{
|
|
struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
|
|
ssize_t cc;
|
|
char *addr = buf;
|
|
|
|
#ifdef NFS_DEBUG
|
|
if (debug)
|
|
printf("nfs_read: size=%lu off=%d\n", (u_long)size,
|
|
(int)fp->off);
|
|
#endif
|
|
while ((int)size > 0) {
|
|
twiddle();
|
|
cc = nfs_readdata(fp, fp->off, (void *)addr, size);
|
|
/* XXX maybe should retry on certain errors */
|
|
if (cc == -1) {
|
|
#ifdef NFS_DEBUG
|
|
if (debug)
|
|
printf("nfs_read: read: %s", strerror(errno));
|
|
#endif
|
|
return (errno); /* XXX - from nfs_readdata */
|
|
}
|
|
if (cc == 0) {
|
|
#ifdef NFS_DEBUG
|
|
if (debug)
|
|
printf("nfs_read: hit EOF unexpectantly");
|
|
#endif
|
|
goto ret;
|
|
}
|
|
fp->off += cc;
|
|
addr += cc;
|
|
size -= cc;
|
|
}
|
|
ret:
|
|
if (resid)
|
|
*resid = size;
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Not implemented.
|
|
*/
|
|
int
|
|
nfs_write(f, buf, size, resid)
|
|
struct open_file *f;
|
|
void *buf;
|
|
size_t size;
|
|
size_t *resid; /* out */
|
|
{
|
|
return (EROFS);
|
|
}
|
|
|
|
off_t
|
|
nfs_seek(f, offset, where)
|
|
struct open_file *f;
|
|
off_t offset;
|
|
int where;
|
|
{
|
|
struct nfs_iodesc *d = (struct nfs_iodesc *)f->f_fsdata;
|
|
n_long size = ntohl(d->fa.fa_size);
|
|
|
|
switch (where) {
|
|
case SEEK_SET:
|
|
d->off = offset;
|
|
break;
|
|
case SEEK_CUR:
|
|
d->off += offset;
|
|
break;
|
|
case SEEK_END:
|
|
d->off = size - offset;
|
|
break;
|
|
default:
|
|
return (-1);
|
|
}
|
|
|
|
return (d->off);
|
|
}
|
|
|
|
/* NFNON=0, NFREG=1, NFDIR=2, NFBLK=3, NFCHR=4, NFLNK=5 */
|
|
int nfs_stat_types[8] = {
|
|
0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 0 };
|
|
|
|
int
|
|
nfs_stat(f, sb)
|
|
struct open_file *f;
|
|
struct stat *sb;
|
|
{
|
|
struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
|
|
n_long ftype, mode;
|
|
|
|
ftype = ntohl(fp->fa.fa_type);
|
|
mode = ntohl(fp->fa.fa_mode);
|
|
mode |= nfs_stat_types[ftype & 7];
|
|
|
|
sb->st_mode = mode;
|
|
sb->st_nlink = ntohl(fp->fa.fa_nlink);
|
|
sb->st_uid = ntohl(fp->fa.fa_uid);
|
|
sb->st_gid = ntohl(fp->fa.fa_gid);
|
|
sb->st_size = ntohl(fp->fa.fa_size);
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
nfs_readdir(struct open_file *f, struct dirent *d)
|
|
{
|
|
struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
|
|
struct nfs_readdir_args *args;
|
|
struct nfs_readdir_data *rd;
|
|
struct nfs_readdir_off *roff = NULL;
|
|
static char *buf;
|
|
static n_long cookie = 0;
|
|
size_t cc;
|
|
n_long eof;
|
|
|
|
struct {
|
|
n_long h[RPC_HEADER_WORDS];
|
|
struct nfs_readdir_args d;
|
|
} sdata;
|
|
static struct {
|
|
n_long h[RPC_HEADER_WORDS];
|
|
u_char d[NFS_READDIRSIZE];
|
|
} rdata;
|
|
|
|
if (cookie == 0) {
|
|
refill:
|
|
args = &sdata.d;
|
|
bzero(args, sizeof(*args));
|
|
|
|
bcopy(fp->fh, args->fh, NFS_FHSIZE);
|
|
args->cookie = htonl(cookie);
|
|
args->count = htonl(NFS_READDIRSIZE);
|
|
|
|
cc = rpc_call(fp->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READDIR,
|
|
args, sizeof(*args),
|
|
rdata.d, sizeof(rdata.d));
|
|
buf = rdata.d;
|
|
roff = (struct nfs_readdir_off *)buf;
|
|
if (ntohl(roff->cookie) != 0)
|
|
return 1;
|
|
}
|
|
roff = (struct nfs_readdir_off *)buf;
|
|
|
|
if (ntohl(roff->follows) == 0) {
|
|
eof = ntohl((roff+1)->cookie);
|
|
if (eof) {
|
|
cookie = 0;
|
|
return 1;
|
|
}
|
|
goto refill;
|
|
}
|
|
|
|
buf += sizeof(struct nfs_readdir_off);
|
|
rd = (struct nfs_readdir_data *)buf;
|
|
d->d_namlen = ntohl(rd->len);
|
|
bcopy(rd->name, d->d_name, d->d_namlen);
|
|
d->d_name[d->d_namlen] = '\0';
|
|
|
|
buf += (sizeof(struct nfs_readdir_data) + roundup(htonl(rd->len),4));
|
|
roff = (struct nfs_readdir_off *)buf;
|
|
cookie = ntohl(roff->cookie);
|
|
return 0;
|
|
}
|