NetBSD/sys/lib/libsa/nfs.c

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/* $NetBSD: nfs.c,v 1.12 1995/09/23 03:36:08 gwr Exp $ */
1994-10-26 08:44:32 +03:00
/*-
* Copyright (c) 1993 John Brezak
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <string.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsv2.h>
#include <nfs/xdr_subs.h>
#include "stand.h"
#include "net.h"
#include "netif.h"
#include "nfs.h"
#include "rpc.h"
/* Define our own NFS attributes without NQNFS stuff. */
struct nfsv2_fattrs {
n_long fa_type;
n_long fa_mode;
n_long fa_nlink;
n_long fa_uid;
n_long fa_gid;
n_long fa_size;
n_long fa_blocksize;
n_long fa_rdev;
n_long fa_blocks;
n_long fa_fsid;
n_long fa_fileid;
struct nfsv2_time fa_atime;
struct nfsv2_time fa_mtime;
struct nfsv2_time fa_ctime;
};
struct nfs_read_args {
u_char fh[NFS_FHSIZE];
n_long off;
n_long len;
n_long xxx; /* XXX what's this for? */
};
/* Data part of nfs rpc reply (also the largest thing we receive) */
#define NFSREAD_SIZE 1024
struct nfs_read_repl {
n_long errno;
struct nfsv2_fattrs fa;
n_long count;
u_char data[NFSREAD_SIZE];
};
struct nfs_iodesc {
struct iodesc *iodesc;
off_t off;
u_char fh[NFS_FHSIZE];
struct nfsv2_fattrs fa; /* all in network order */
};
struct nfs_iodesc nfs_root_node;
/*
* Fetch the root file handle (call mount daemon)
* On error, return non-zero and set errno.
*/
int
nfs_getrootfh(d, path, fhp)
register struct iodesc *d;
char *path;
u_char *fhp;
{
register int len;
struct args {
n_long len;
char path[FNAME_SIZE];
} *args;
struct repl {
n_long errno;
u_char fh[NFS_FHSIZE];
} *repl;
struct {
n_long h[RPC_HEADER_WORDS];
struct args d;
} sdata;
struct {
n_long h[RPC_HEADER_WORDS];
struct repl d;
} rdata;
size_t cc;
#ifdef NFS_DEBUG
if (debug)
printf("nfs_getrootfh: %s\n", path);
#endif
args = &sdata.d;
repl = &rdata.d;
bzero(args, sizeof(*args));
len = strlen(path);
if (len > sizeof(args->path))
len = sizeof(args->path);
args->len = htonl(len);
bcopy(path, args->path, len);
len = 4 + roundup(len, 4);
cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT,
args, len, repl, sizeof(*repl));
if (cc == -1) {
/* errno was set by rpc_call */
return (-1);
}
if (cc < 4) {
errno = EBADRPC;
return (-1);
}
if (repl->errno) {
errno = ntohl(repl->errno);
return (-1);
}
bcopy(repl->fh, fhp, sizeof(repl->fh));
return (0);
}
/*
* Lookup a file. Store handle and attributes.
* Return zero or error number.
*/
int
nfs_lookupfh(d, name, newfd)
struct nfs_iodesc *d;
char *name;
struct nfs_iodesc *newfd;
{
register int len, rlen;
struct args {
u_char fh[NFS_FHSIZE];
n_long len;
char name[FNAME_SIZE];
} *args;
struct repl {
n_long errno;
u_char fh[NFS_FHSIZE];
struct nfsv2_fattrs fa;
} *repl;
struct {
n_long h[RPC_HEADER_WORDS];
struct args d;
} sdata;
struct {
n_long h[RPC_HEADER_WORDS];
struct repl d;
} rdata;
ssize_t cc;
#ifdef NFS_DEBUG
if (debug)
printf("lookupfh: called\n");
#endif
args = &sdata.d;
repl = &rdata.d;
bzero(args, sizeof(*args));
bcopy(d->fh, args->fh, sizeof(args->fh));
len = strlen(name);
if (len > sizeof(args->name))
len = sizeof(args->name);
bcopy(name, args->name, len);
args->len = htonl(len);
len = 4 + roundup(len, 4);
len += NFS_FHSIZE;
rlen = sizeof(*repl);
cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_LOOKUP,
args, len, repl, rlen);
if (cc == -1)
return (errno); /* XXX - from rpc_call */
if (cc < 4)
return (EIO);
if (repl->errno) {
/* saerrno.h now matches NFS error numbers. */
return (ntohl(repl->errno));
}
bcopy( repl->fh, &newfd->fh, sizeof(newfd->fh));
bcopy(&repl->fa, &newfd->fa, sizeof(newfd->fa));
return (0);
}
/*
* Read data from a file.
* Return transfer count or -1 (and set errno)
*/
ssize_t
nfs_readdata(d, off, addr, len)
struct nfs_iodesc *d;
off_t off;
void *addr;
size_t len;
{
struct nfs_read_args *args;
struct nfs_read_repl *repl;
struct {
n_long h[RPC_HEADER_WORDS];
struct nfs_read_args d;
} sdata;
struct {
n_long h[RPC_HEADER_WORDS];
struct nfs_read_repl d;
} rdata;
size_t cc;
long x;
int hlen, rlen;
args = &sdata.d;
repl = &rdata.d;
bcopy(d->fh, args->fh, NFS_FHSIZE);
args->off = txdr_unsigned(off);
if (len > NFSREAD_SIZE)
len = NFSREAD_SIZE;
args->len = txdr_unsigned(len);
args->xxx = txdr_unsigned(0);
hlen = sizeof(*repl) - NFSREAD_SIZE;
cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READ,
args, sizeof(*args),
repl, sizeof(*repl));
if (cc == -1) {
/* errno was already set by rpc_call */
return (-1);
}
if (cc < hlen) {
errno = EBADRPC;
return (-1);
}
if (repl->errno) {
errno = ntohl(repl->errno);
return (-1);
}
rlen = cc - hlen;
x = ntohl(repl->count);
if (rlen < x) {
printf("nfsread: short packet, %d < %d\n", rlen, x);
errno = EBADRPC;
return(-1);
}
bcopy(repl->data, addr, x);
return (x);
}
/*
* nfs_mount - mount this nfs filesystem to a host
* On error, return non-zero and set errno.
*/
int
nfs_mount(sock, ip, path)
int sock;
struct in_addr ip;
char *path;
{
struct iodesc *desc;
struct nfsv2_fattrs *fa;
if (!(desc = socktodesc(sock))) {
errno = EINVAL;
return(-1);
}
/* Bind to a reserved port. */
desc->myport = htons(--rpc_port);
desc->destip = ip;
if (nfs_getrootfh(desc, path, nfs_root_node.fh))
return (-1);
nfs_root_node.iodesc = desc;
/* Fake up attributes for the root dir. */
fa = &nfs_root_node.fa;
fa->fa_type = htonl(NFDIR);
fa->fa_mode = htonl(0755);
fa->fa_nlink = htonl(2);
#ifdef NFS_DEBUG
if (debug)
printf("nfs_mount: got fh for %s\n", path);
#endif
return(0);
}
/*
* Open a file.
* return zero or error number
*/
int
nfs_open(path, f)
char *path;
struct open_file *f;
{
struct nfs_iodesc *newfd;
int error = 0;
#ifdef NFS_DEBUG
if (debug)
printf("nfs_open: %s\n", path);
#endif
if (nfs_root_node.iodesc == NULL) {
printf("nfs_open: must mount first.\n");
return (ENXIO);
}
/* allocate file system specific data structure */
newfd = alloc(sizeof(*newfd));
newfd->iodesc = nfs_root_node.iodesc;
newfd->off = 0;
/* lookup a file handle */
error = nfs_lookupfh(&nfs_root_node, path, newfd);
if (!error) {
f->f_fsdata = (void *)newfd;
return (0);
}
#ifdef NFS_DEBUG
if (debug)
printf("nfs_open: %s lookupfh failed: %s\n",
path, strerror(error));
#endif
free(newfd, sizeof(*newfd));
return (error);
}
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: fp=0x%x\n", fp);
#endif
if (fp)
free(fp, sizeof(struct nfs_iodesc));
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 */
{
register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
register ssize_t cc;
register char *addr = buf;
#ifdef NFS_DEBUG
if (debug)
printf("nfs_read: size=%d off=%d\n", 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) {
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, 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;
{
register 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;
register 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);
}