FreeBSD source tree
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
 
 
 
 
 
 

852 lines
18 KiB

/* $NetBSD: nfs.c,v 1.2 1998/01/24 12:43:09 drochner Exp $ */
/*-
* 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/time.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <string.h>
#include <stddef.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include "rpcv2.h"
#include "nfsv2.h"
#include "stand.h"
#include "net.h"
#include "netif.h"
#include "rpc.h"
#define NFS_DEBUGxx
#define NFSREAD_MIN_SIZE 1024
#define NFSREAD_MAX_SIZE 16384
/* NFSv3 definitions */
#define NFS_V3MAXFHSIZE 64
#define NFS_VER3 3
#define RPCMNT_VER3 3
#define NFSPROCV3_LOOKUP 3
#define NFSPROCV3_READLINK 5
#define NFSPROCV3_READ 6
#define NFSPROCV3_READDIR 16
typedef struct {
uint32_t val[2];
} n_quad;
struct nfsv3_time {
uint32_t nfs_sec;
uint32_t nfs_nsec;
};
struct nfsv3_fattrs {
uint32_t fa_type;
uint32_t fa_mode;
uint32_t fa_nlink;
uint32_t fa_uid;
uint32_t fa_gid;
n_quad fa_size;
n_quad fa_used;
n_quad fa_rdev;
n_quad fa_fsid;
n_quad fa_fileid;
struct nfsv3_time fa_atime;
struct nfsv3_time fa_mtime;
struct nfsv3_time fa_ctime;
};
/*
* For NFSv3, the file handle is variable in size, so most fixed sized
* structures for arguments won't work. For most cases, a structure
* that starts with any fixed size section is followed by an array
* that covers the maximum size required.
*/
struct nfsv3_readdir_repl {
uint32_t errno;
uint32_t ok;
struct nfsv3_fattrs fa;
uint32_t cookiev0;
uint32_t cookiev1;
};
struct nfsv3_readdir_entry {
uint32_t follows;
uint32_t fid0;
uint32_t fid1;
uint32_t len;
uint32_t nameplus[0];
};
struct nfs_iodesc {
struct iodesc *iodesc;
off_t off;
uint32_t fhsize;
u_char fh[NFS_V3MAXFHSIZE];
struct nfsv3_fattrs fa; /* all in network order */
uint64_t cookie;
};
/*
* XXX interactions with tftp? See nfswrapper.c for a confusing
* issue.
*/
int nfs_open(const char *path, struct open_file *f);
static int nfs_close(struct open_file *f);
static int nfs_read(struct open_file *f, void *buf, size_t size, size_t *resid);
static off_t nfs_seek(struct open_file *f, off_t offset, int where);
static int nfs_stat(struct open_file *f, struct stat *sb);
static int nfs_readdir(struct open_file *f, struct dirent *d);
struct nfs_iodesc nfs_root_node;
struct fs_ops nfs_fsops = {
"nfs",
nfs_open,
nfs_close,
nfs_read,
null_write,
nfs_seek,
nfs_stat,
nfs_readdir
};
static int nfs_read_size = NFSREAD_MIN_SIZE;
/*
* Improve boot performance over NFS
*/
static void
set_nfs_read_size(void)
{
char *env, *end;
char buf[10];
if ((env = getenv("nfs.read_size")) != NULL) {
errno = 0;
nfs_read_size = (int)strtol(env, &end, 0);
if (errno != 0 || *env == '\0' || *end != '\0') {
printf("%s: bad value: \"%s\", defaulting to %d\n",
"nfs.read_size", env, NFSREAD_MIN_SIZE);
nfs_read_size = NFSREAD_MIN_SIZE;
}
}
if (nfs_read_size < NFSREAD_MIN_SIZE) {
printf("%s: bad value: \"%d\", defaulting to %d\n",
"nfs.read_size", nfs_read_size, NFSREAD_MIN_SIZE);
nfs_read_size = NFSREAD_MIN_SIZE;
}
if (nfs_read_size > NFSREAD_MAX_SIZE) {
printf("%s: bad value: \"%d\", defaulting to %d\n",
"nfs.read_size", nfs_read_size, NFSREAD_MIN_SIZE);
nfs_read_size = NFSREAD_MAX_SIZE;
}
snprintf(buf, sizeof (buf), "%d", nfs_read_size);
setenv("nfs.read_size", buf, 1);
}
/*
* Fetch the root file handle (call mount daemon)
* Return zero or error number.
*/
int
nfs_getrootfh(struct iodesc *d, char *path, uint32_t *fhlenp, u_char *fhp)
{
void *pkt = NULL;
int len;
struct args {
uint32_t len;
char path[FNAME_SIZE];
} *args;
struct repl {
uint32_t errno;
uint32_t fhsize;
u_char fh[NFS_V3MAXFHSIZE];
uint32_t authcnt;
uint32_t auth[7];
} *repl;
struct {
uint32_t h[RPC_HEADER_WORDS];
struct args d;
} sdata;
size_t cc;
#ifdef NFS_DEBUG
if (debug)
printf("nfs_getrootfh: %s\n", path);
#endif
args = &sdata.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 = sizeof(uint32_t) + roundup(len, sizeof(uint32_t));
cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER3, RPCMNT_MOUNT,
args, len, (void **)&repl, &pkt);
if (cc == -1) {
free(pkt);
/* errno was set by rpc_call */
return (errno);
}
if (cc < 2 * sizeof (uint32_t)) {
free(pkt);
return (EBADRPC);
}
if (repl->errno != 0) {
free(pkt);
return (ntohl(repl->errno));
}
*fhlenp = ntohl(repl->fhsize);
bcopy(repl->fh, fhp, *fhlenp);
set_nfs_read_size();
free(pkt);
return (0);
}
/*
* Lookup a file. Store handle and attributes.
* Return zero or error number.
*/
int
nfs_lookupfh(struct nfs_iodesc *d, const char *name, struct nfs_iodesc *newfd)
{
void *pkt = NULL;
int len, pos;
struct args {
uint32_t fhsize;
uint32_t fhplusname[1 +
(NFS_V3MAXFHSIZE + FNAME_SIZE) / sizeof(uint32_t)];
} *args;
struct repl {
uint32_t errno;
uint32_t fhsize;
uint32_t fhplusattr[(NFS_V3MAXFHSIZE +
2 * (sizeof(uint32_t) +
sizeof(struct nfsv3_fattrs))) / sizeof(uint32_t)];
} *repl;
struct {
uint32_t h[RPC_HEADER_WORDS];
struct args d;
} sdata;
ssize_t cc;
#ifdef NFS_DEBUG
if (debug)
printf("lookupfh: called\n");
#endif
args = &sdata.d;
bzero(args, sizeof(*args));
args->fhsize = htonl(d->fhsize);
bcopy(d->fh, args->fhplusname, d->fhsize);
len = strlen(name);
if (len > FNAME_SIZE)
len = FNAME_SIZE;
pos = roundup(d->fhsize, sizeof(uint32_t)) / sizeof(uint32_t);
args->fhplusname[pos++] = htonl(len);
bcopy(name, &args->fhplusname[pos], len);
len = sizeof(uint32_t) + pos * sizeof(uint32_t) +
roundup(len, sizeof(uint32_t));
cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER3, NFSPROCV3_LOOKUP,
args, len, (void **)&repl, &pkt);
if (cc == -1) {
free(pkt);
return (errno); /* XXX - from rpc_call */
}
if (cc < 2 * sizeof(uint32_t)) {
free(pkt);
return (EIO);
}
if (repl->errno != 0) {
free(pkt);
/* saerrno.h now matches NFS error numbers. */
return (ntohl(repl->errno));
}
newfd->fhsize = ntohl(repl->fhsize);
bcopy(repl->fhplusattr, &newfd->fh, newfd->fhsize);
pos = roundup(newfd->fhsize, sizeof(uint32_t)) / sizeof(uint32_t);
if (repl->fhplusattr[pos++] == 0) {
free(pkt);
return (EIO);
}
bcopy(&repl->fhplusattr[pos], &newfd->fa, sizeof(newfd->fa));
free(pkt);
return (0);
}
#ifndef NFS_NOSYMLINK
/*
* Get the destination of a symbolic link.
*/
int
nfs_readlink(struct nfs_iodesc *d, char *buf)
{
void *pkt = NULL;
struct args {
uint32_t fhsize;
u_char fh[NFS_V3MAXFHSIZE];
} *args;
struct repl {
uint32_t errno;
uint32_t ok;
struct nfsv3_fattrs fa;
uint32_t len;
u_char path[NFS_MAXPATHLEN];
} *repl;
struct {
uint32_t h[RPC_HEADER_WORDS];
struct args d;
} sdata;
ssize_t cc;
int rc = 0;
#ifdef NFS_DEBUG
if (debug)
printf("readlink: called\n");
#endif
args = &sdata.d;
bzero(args, sizeof(*args));
args->fhsize = htonl(d->fhsize);
bcopy(d->fh, args->fh, d->fhsize);
cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER3, NFSPROCV3_READLINK,
args, sizeof(uint32_t) + roundup(d->fhsize, sizeof(uint32_t)),
(void **)&repl, &pkt);
if (cc == -1)
return (errno);
if (cc < 2 * sizeof(uint32_t)) {
rc = EIO;
goto done;
}
if (repl->errno != 0) {
rc = ntohl(repl->errno);
goto done;
}
if (repl->ok == 0) {
rc = EIO;
goto done;
}
repl->len = ntohl(repl->len);
if (repl->len > NFS_MAXPATHLEN) {
rc = ENAMETOOLONG;
goto done;
}
bcopy(repl->path, buf, repl->len);
buf[repl->len] = 0;
done:
free(pkt);
return (rc);
}
#endif
/*
* Read data from a file.
* Return transfer count or -1 (and set errno)
*/
ssize_t
nfs_readdata(struct nfs_iodesc *d, off_t off, void *addr, size_t len)
{
void *pkt = NULL;
struct args {
uint32_t fhsize;
uint32_t fhoffcnt[NFS_V3MAXFHSIZE / sizeof(uint32_t) + 3];
} *args;
struct repl {
uint32_t errno;
uint32_t ok;
struct nfsv3_fattrs fa;
uint32_t count;
uint32_t eof;
uint32_t len;
u_char data[NFSREAD_MAX_SIZE];
} *repl;
struct {
uint32_t h[RPC_HEADER_WORDS];
struct args d;
} sdata;
size_t cc;
long x;
int hlen, rlen, pos;
args = &sdata.d;
bzero(args, sizeof(*args));
args->fhsize = htonl(d->fhsize);
bcopy(d->fh, args->fhoffcnt, d->fhsize);
pos = roundup(d->fhsize, sizeof(uint32_t)) / sizeof(uint32_t);
args->fhoffcnt[pos++] = 0;
args->fhoffcnt[pos++] = htonl((uint32_t)off);
if (len > nfs_read_size)
len = nfs_read_size;
args->fhoffcnt[pos] = htonl((uint32_t)len);
hlen = offsetof(struct repl, data[0]);
cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER3, NFSPROCV3_READ,
args, 4 * sizeof(uint32_t) + roundup(d->fhsize, sizeof(uint32_t)),
(void **)&repl, &pkt);
if (cc == -1) {
/* errno was already set by rpc_call */
return (-1);
}
if (cc < hlen) {
errno = EBADRPC;
free(pkt);
return (-1);
}
if (repl->errno != 0) {
errno = ntohl(repl->errno);
free(pkt);
return (-1);
}
rlen = cc - hlen;
x = ntohl(repl->count);
if (rlen < x) {
printf("nfsread: short packet, %d < %ld\n", rlen, x);
errno = EBADRPC;
free(pkt);
return (-1);
}
bcopy(repl->data, addr, x);
free(pkt);
return (x);
}
/*
* Open a file.
* return zero or error number
*/
int
nfs_open(const char *upath, struct open_file *f)
{
struct devdesc *dev;
struct iodesc *desc;
struct nfs_iodesc *currfd = NULL;
char buf[2 * NFS_V3MAXFHSIZE + 3];
u_char *fh;
char *cp;
int i;
#ifndef NFS_NOSYMLINK
struct nfs_iodesc *newfd = NULL;
char *ncp;
int c;
char namebuf[NFS_MAXPATHLEN + 1];
char linkbuf[NFS_MAXPATHLEN + 1];
int nlinks = 0;
#endif
int error;
char *path = NULL;
if (netproto != NET_NFS)
return (EINVAL);
dev = f->f_devdata;
#ifdef NFS_DEBUG
if (debug)
printf("nfs_open: %s (rootip=%s rootpath=%s)\n", upath,
inet_ntoa(rootip), rootpath);
#endif
if (!rootpath[0]) {
printf("no rootpath, no nfs\n");
return (ENXIO);
}
if (f->f_dev->dv_type != DEVT_NET)
return (EINVAL);
if (!(desc = socktodesc(*(int *)(dev->d_opendata))))
return (EINVAL);
/* Bind to a reserved port. */
desc->myport = htons(--rpc_port);
desc->destip = rootip;
if ((error = nfs_getrootfh(desc, rootpath, &nfs_root_node.fhsize,
nfs_root_node.fh)))
return (error);
nfs_root_node.fa.fa_type = htonl(NFDIR);
nfs_root_node.fa.fa_mode = htonl(0755);
nfs_root_node.fa.fa_nlink = htonl(2);
nfs_root_node.iodesc = desc;
fh = &nfs_root_node.fh[0];
buf[0] = 'X';
cp = &buf[1];
for (i = 0; i < nfs_root_node.fhsize; i++, cp += 2)
sprintf(cp, "%02x", fh[i]);
sprintf(cp, "X");
setenv("boot.nfsroot.server", inet_ntoa(rootip), 1);
setenv("boot.nfsroot.path", rootpath, 1);
setenv("boot.nfsroot.nfshandle", buf, 1);
sprintf(buf, "%d", nfs_root_node.fhsize);
setenv("boot.nfsroot.nfshandlelen", buf, 1);
/* Allocate file system specific data structure */
currfd = malloc(sizeof(*newfd));
if (currfd == NULL) {
error = ENOMEM;
goto out;
}
#ifndef NFS_NOSYMLINK
bcopy(&nfs_root_node, currfd, sizeof(*currfd));
newfd = NULL;
cp = path = strdup(upath);
if (path == NULL) {
error = ENOMEM;
goto out;
}
while (*cp) {
/*
* Remove extra separators
*/
while (*cp == '/')
cp++;
if (*cp == '\0')
break;
/*
* Check that current node is a directory.
*/
if (currfd->fa.fa_type != htonl(NFDIR)) {
error = ENOTDIR;
goto out;
}
/* allocate file system specific data structure */
newfd = malloc(sizeof(*newfd));
if (newfd == NULL) {
error = ENOMEM;
goto out;
}
newfd->iodesc = currfd->iodesc;
/*
* Get next component of path name.
*/
{
int len = 0;
ncp = cp;
while ((c = *cp) != '\0' && c != '/') {
if (++len > NFS_MAXNAMLEN) {
error = ENOENT;
goto out;
}
cp++;
}
*cp = '\0';
}
/* lookup a file handle */
error = nfs_lookupfh(currfd, ncp, newfd);
*cp = c;
if (error)
goto out;
/*
* Check for symbolic link
*/
if (newfd->fa.fa_type == htonl(NFLNK)) {
int link_len, len;
error = nfs_readlink(newfd, linkbuf);
if (error)
goto out;
link_len = strlen(linkbuf);
len = strlen(cp);
if (link_len + len > MAXPATHLEN
|| ++nlinks > MAXSYMLINKS) {
error = ENOENT;
goto out;
}
bcopy(cp, &namebuf[link_len], len + 1);
bcopy(linkbuf, namebuf, link_len);
/*
* If absolute pathname, restart at root.
* If relative pathname, restart at parent directory.
*/
cp = namebuf;
if (*cp == '/')
bcopy(&nfs_root_node, currfd, sizeof(*currfd));
free(newfd);
newfd = NULL;
continue;
}
free(currfd);
currfd = newfd;
newfd = NULL;
}
error = 0;
out:
free(newfd);
free(path);
#else
currfd->iodesc = desc;
error = nfs_lookupfh(&nfs_root_node, upath, currfd);
#endif
if (!error) {
currfd->off = 0;
currfd->cookie = 0;
f->f_fsdata = (void *)currfd;
return (0);
}
#ifdef NFS_DEBUG
if (debug)
printf("nfs_open: %s lookupfh failed: %s\n",
path, strerror(error));
#endif
free(currfd);
return (error);
}
int
nfs_close(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
free(fp);
f->f_fsdata = NULL;
return (0);
}
/*
* read a portion of a file
*/
int
nfs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
{
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(16);
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\n", strerror(errno));
#endif
return (errno); /* XXX - from nfs_readdata */
}
if (cc == 0) {
#ifdef NFS_DEBUG
if (debug)
printf("nfs_read: hit EOF unexpectedly\n");
#endif
goto ret;
}
fp->off += cc;
addr += cc;
size -= cc;
}
ret:
if (resid)
*resid = size;
return (0);
}
off_t
nfs_seek(struct open_file *f, off_t offset, int where)
{
struct nfs_iodesc *d = (struct nfs_iodesc *)f->f_fsdata;
uint32_t size = ntohl(d->fa.fa_size.val[1]);
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:
errno = EINVAL;
return (-1);
}
return (d->off);
}
/* NFNON=0, NFREG=1, NFDIR=2, NFBLK=3, NFCHR=4, NFLNK=5, NFSOCK=6, NFFIFO=7 */
int nfs_stat_types[9] = {
0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, S_IFSOCK, S_IFIFO, 0 };
int
nfs_stat(struct open_file *f, struct stat *sb)
{
struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
uint32_t 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.val[1]);
return (0);
}
static int
nfs_readdir(struct open_file *f, struct dirent *d)
{
struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
struct nfsv3_readdir_repl *repl;
struct nfsv3_readdir_entry *rent;
static void *pkt = NULL;
static char *buf;
static struct nfs_iodesc *pfp = NULL;
static uint64_t cookie = 0;
size_t cc;
int pos, rc;
struct args {
uint32_t fhsize;
uint32_t fhpluscookie[5 + NFS_V3MAXFHSIZE];
} *args;
struct {
uint32_t h[RPC_HEADER_WORDS];
struct args d;
} sdata;
if (fp != pfp || fp->off != cookie) {
pfp = NULL;
refill:
free(pkt);
pkt = NULL;
args = &sdata.d;
bzero(args, sizeof(*args));
args->fhsize = htonl(fp->fhsize);
bcopy(fp->fh, args->fhpluscookie, fp->fhsize);
pos = roundup(fp->fhsize, sizeof(uint32_t)) / sizeof(uint32_t);
args->fhpluscookie[pos++] = htonl(fp->off >> 32);
args->fhpluscookie[pos++] = htonl(fp->off);
args->fhpluscookie[pos++] = htonl(fp->cookie >> 32);
args->fhpluscookie[pos++] = htonl(fp->cookie);
args->fhpluscookie[pos] = htonl(NFS_READDIRSIZE);
cc = rpc_call(fp->iodesc, NFS_PROG, NFS_VER3, NFSPROCV3_READDIR,
args, 6 * sizeof(uint32_t) +
roundup(fp->fhsize, sizeof(uint32_t)),
(void **)&buf, &pkt);
if (cc == -1) {
rc = errno;
goto err;
}
repl = (struct nfsv3_readdir_repl *)buf;
if (repl->errno != 0) {
rc = ntohl(repl->errno);
goto err;
}
pfp = fp;
cookie = fp->off;
fp->cookie = ((uint64_t)ntohl(repl->cookiev0) << 32) |
ntohl(repl->cookiev1);
buf += sizeof (struct nfsv3_readdir_repl);
}
rent = (struct nfsv3_readdir_entry *)buf;
if (rent->follows == 0) {
/* fid0 is actually eof */
if (rent->fid0 != 0) {
rc = ENOENT;
goto err;
}
goto refill;
}
d->d_namlen = ntohl(rent->len);
bcopy(rent->nameplus, d->d_name, d->d_namlen);
d->d_name[d->d_namlen] = '\0';
pos = roundup(d->d_namlen, sizeof(uint32_t)) / sizeof(uint32_t);
fp->off = cookie = ((uint64_t)ntohl(rent->nameplus[pos]) << 32) |
ntohl(rent->nameplus[pos + 1]);
pos += 2;
buf = (char *)&rent->nameplus[pos];
return (0);
err:
free(pkt);
pkt = NULL;
pfp = NULL;
cookie = 0;
return (rc);
}