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nfs.c revision 1.14 
      1 /*	$NetBSD: nfs.c,v 1.14 1996/02/26 23:05:21 gwr Exp $	*/
      2 
      3 /*-
      4  *  Copyright (c) 1993 John Brezak
      5  *  All rights reserved.
      6  *
      7  *  Redistribution and use in source and binary forms, with or without
      8  *  modification, are permitted provided that the following conditions
      9  *  are met:
     10  *  1. Redistributions of source code must retain the above copyright
     11  *     notice, this list of conditions and the following disclaimer.
     12  *  2. Redistributions in binary form must reproduce the above copyright
     13  *     notice, this list of conditions and the following disclaimer in the
     14  *     documentation and/or other materials provided with the distribution.
     15  *  3. The name of the author may not be used to endorse or promote products
     16  *     derived from this software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
     19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
     20  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
     21  * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
     22  * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
     23  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
     24  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
     26  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
     27  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     28  * POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include <sys/param.h>
     32 #include <sys/time.h>
     33 #include <sys/socket.h>
     34 #include <sys/stat.h>
     35 #include <string.h>
     36 
     37 #include <netinet/in.h>
     38 #include <netinet/in_systm.h>
     39 
     40 #include "rpcv2.h"
     41 #include "nfsv2.h"
     42 
     43 #include "stand.h"
     44 #include "net.h"
     45 #include "netif.h"
     46 #include "nfs.h"
     47 #include "rpc.h"
     48 
     49 /* Define our own NFS attributes without NQNFS stuff. */
     50 struct nfsv2_fattrs {
     51 	n_long	fa_type;
     52 	n_long	fa_mode;
     53 	n_long	fa_nlink;
     54 	n_long	fa_uid;
     55 	n_long	fa_gid;
     56 	n_long	fa_size;
     57 	n_long	fa_blocksize;
     58 	n_long	fa_rdev;
     59 	n_long	fa_blocks;
     60 	n_long	fa_fsid;
     61 	n_long	fa_fileid;
     62 	struct nfsv2_time fa_atime;
     63 	struct nfsv2_time fa_mtime;
     64 	struct nfsv2_time fa_ctime;
     65 };
     66 
     67 
     68 struct nfs_read_args {
     69 	u_char	fh[NFS_FHSIZE];
     70 	n_long	off;
     71 	n_long	len;
     72 	n_long	xxx;			/* XXX what's this for? */
     73 };
     74 
     75 /* Data part of nfs rpc reply (also the largest thing we receive) */
     76 #define NFSREAD_SIZE 1024
     77 struct nfs_read_repl {
     78 	n_long	errno;
     79 	struct	nfsv2_fattrs fa;
     80 	n_long	count;
     81 	u_char	data[NFSREAD_SIZE];
     82 };
     83 
     84 struct nfs_iodesc {
     85 	struct	iodesc	*iodesc;
     86 	off_t	off;
     87 	u_char	fh[NFS_FHSIZE];
     88 	struct nfsv2_fattrs fa;	/* all in network order */
     89 };
     90 
     91 struct nfs_iodesc nfs_root_node;
     92 
     93 
     94 /*
     95  * Fetch the root file handle (call mount daemon)
     96  * On error, return non-zero and set errno.
     97  */
     98 int
     99 nfs_getrootfh(d, path, fhp)
    100 	register struct iodesc *d;
    101 	char *path;
    102 	u_char *fhp;
    103 {
    104 	register int len;
    105 	struct args {
    106 		n_long	len;
    107 		char	path[FNAME_SIZE];
    108 	} *args;
    109 	struct repl {
    110 		n_long	errno;
    111 		u_char	fh[NFS_FHSIZE];
    112 	} *repl;
    113 	struct {
    114 		n_long	h[RPC_HEADER_WORDS];
    115 		struct args d;
    116 	} sdata;
    117 	struct {
    118 		n_long	h[RPC_HEADER_WORDS];
    119 		struct repl d;
    120 	} rdata;
    121 	size_t cc;
    122 
    123 #ifdef NFS_DEBUG
    124 	if (debug)
    125 		printf("nfs_getrootfh: %s\n", path);
    126 #endif
    127 
    128 	args = &sdata.d;
    129 	repl = &rdata.d;
    130 
    131 	bzero(args, sizeof(*args));
    132 	len = strlen(path);
    133 	if (len > sizeof(args->path))
    134 		len = sizeof(args->path);
    135 	args->len = htonl(len);
    136 	bcopy(path, args->path, len);
    137 	len = 4 + roundup(len, 4);
    138 
    139 	cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT,
    140 	    args, len, repl, sizeof(*repl));
    141 	if (cc == -1) {
    142 		/* errno was set by rpc_call */
    143 		return (-1);
    144 	}
    145 	if (cc < 4) {
    146 		errno = EBADRPC;
    147 		return (-1);
    148 	}
    149 	if (repl->errno) {
    150 		errno = ntohl(repl->errno);
    151 		return (-1);
    152 	}
    153 	bcopy(repl->fh, fhp, sizeof(repl->fh));
    154 	return (0);
    155 }
    156 
    157 /*
    158  * Lookup a file.  Store handle and attributes.
    159  * Return zero or error number.
    160  */
    161 int
    162 nfs_lookupfh(d, name, newfd)
    163 	struct nfs_iodesc *d;
    164 	char *name;
    165 	struct nfs_iodesc *newfd;
    166 {
    167 	register int len, rlen;
    168 	struct args {
    169 		u_char	fh[NFS_FHSIZE];
    170 		n_long	len;
    171 		char	name[FNAME_SIZE];
    172 	} *args;
    173 	struct repl {
    174 		n_long	errno;
    175 		u_char	fh[NFS_FHSIZE];
    176 		struct	nfsv2_fattrs fa;
    177 	} *repl;
    178 	struct {
    179 		n_long	h[RPC_HEADER_WORDS];
    180 		struct args d;
    181 	} sdata;
    182 	struct {
    183 		n_long	h[RPC_HEADER_WORDS];
    184 		struct repl d;
    185 	} rdata;
    186 	ssize_t cc;
    187 
    188 #ifdef NFS_DEBUG
    189 	if (debug)
    190 		printf("lookupfh: called\n");
    191 #endif
    192 
    193 	args = &sdata.d;
    194 	repl = &rdata.d;
    195 
    196 	bzero(args, sizeof(*args));
    197 	bcopy(d->fh, args->fh, sizeof(args->fh));
    198 	len = strlen(name);
    199 	if (len > sizeof(args->name))
    200 		len = sizeof(args->name);
    201 	bcopy(name, args->name, len);
    202 	args->len = htonl(len);
    203 	len = 4 + roundup(len, 4);
    204 	len += NFS_FHSIZE;
    205 
    206 	rlen = sizeof(*repl);
    207 
    208 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_LOOKUP,
    209 	    args, len, repl, rlen);
    210 	if (cc == -1)
    211 		return (errno);		/* XXX - from rpc_call */
    212 	if (cc < 4)
    213 		return (EIO);
    214 	if (repl->errno) {
    215 		/* saerrno.h now matches NFS error numbers. */
    216 		return (ntohl(repl->errno));
    217 	}
    218 	bcopy( repl->fh, &newfd->fh, sizeof(newfd->fh));
    219 	bcopy(&repl->fa, &newfd->fa, sizeof(newfd->fa));
    220 	return (0);
    221 }
    222 
    223 /*
    224  * Read data from a file.
    225  * Return transfer count or -1 (and set errno)
    226  */
    227 ssize_t
    228 nfs_readdata(d, off, addr, len)
    229 	struct nfs_iodesc *d;
    230 	off_t off;
    231 	void *addr;
    232 	size_t len;
    233 {
    234 	struct nfs_read_args *args;
    235 	struct nfs_read_repl *repl;
    236 	struct {
    237 		n_long	h[RPC_HEADER_WORDS];
    238 		struct nfs_read_args d;
    239 	} sdata;
    240 	struct {
    241 		n_long	h[RPC_HEADER_WORDS];
    242 		struct nfs_read_repl d;
    243 	} rdata;
    244 	size_t cc;
    245 	long x;
    246 	int hlen, rlen;
    247 
    248 	args = &sdata.d;
    249 	repl = &rdata.d;
    250 
    251 	bcopy(d->fh, args->fh, NFS_FHSIZE);
    252 	args->off = htonl((n_long)off);
    253 	if (len > NFSREAD_SIZE)
    254 		len = NFSREAD_SIZE;
    255 	args->len = htonl((n_long)len);
    256 	args->xxx = htonl((n_long)0);
    257 	hlen = sizeof(*repl) - NFSREAD_SIZE;
    258 
    259 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READ,
    260 	    args, sizeof(*args),
    261 	    repl, sizeof(*repl));
    262 	if (cc == -1) {
    263 		/* errno was already set by rpc_call */
    264 		return (-1);
    265 	}
    266 	if (cc < hlen) {
    267 		errno = EBADRPC;
    268 		return (-1);
    269 	}
    270 	if (repl->errno) {
    271 		errno = ntohl(repl->errno);
    272 		return (-1);
    273 	}
    274 	rlen = cc - hlen;
    275 	x = ntohl(repl->count);
    276 	if (rlen < x) {
    277 		printf("nfsread: short packet, %d < %d\n", rlen, x);
    278 		errno = EBADRPC;
    279 		return(-1);
    280 	}
    281 	bcopy(repl->data, addr, x);
    282 	return (x);
    283 }
    284 
    285 /*
    286  * nfs_mount - mount this nfs filesystem to a host
    287  * On error, return non-zero and set errno.
    288  */
    289 int
    290 nfs_mount(sock, ip, path)
    291 	int sock;
    292 	struct in_addr ip;
    293 	char *path;
    294 {
    295 	struct iodesc *desc;
    296 	struct nfsv2_fattrs *fa;
    297 
    298 	if (!(desc = socktodesc(sock))) {
    299 		errno = EINVAL;
    300 		return(-1);
    301 	}
    302 
    303 	/* Bind to a reserved port. */
    304 	desc->myport = htons(--rpc_port);
    305 	desc->destip = ip;
    306 	if (nfs_getrootfh(desc, path, nfs_root_node.fh))
    307 		return (-1);
    308 	nfs_root_node.iodesc = desc;
    309 	/* Fake up attributes for the root dir. */
    310 	fa = &nfs_root_node.fa;
    311 	fa->fa_type  = htonl(NFDIR);
    312 	fa->fa_mode  = htonl(0755);
    313 	fa->fa_nlink = htonl(2);
    314 
    315 #ifdef NFS_DEBUG
    316 	if (debug)
    317 		printf("nfs_mount: got fh for %s\n", path);
    318 #endif
    319 
    320 	return(0);
    321 }
    322 
    323 /*
    324  * Open a file.
    325  * return zero or error number
    326  */
    327 int
    328 nfs_open(path, f)
    329 	char *path;
    330 	struct open_file *f;
    331 {
    332 	struct nfs_iodesc *newfd;
    333 	int error = 0;
    334 
    335 #ifdef NFS_DEBUG
    336  	if (debug)
    337  	    printf("nfs_open: %s\n", path);
    338 #endif
    339 	if (nfs_root_node.iodesc == NULL) {
    340 		printf("nfs_open: must mount first.\n");
    341 		return (ENXIO);
    342 	}
    343 
    344 	/* allocate file system specific data structure */
    345 	newfd = alloc(sizeof(*newfd));
    346 	newfd->iodesc = nfs_root_node.iodesc;
    347 	newfd->off = 0;
    348 
    349 	/* lookup a file handle */
    350 	error = nfs_lookupfh(&nfs_root_node, path, newfd);
    351 	if (!error) {
    352 		f->f_fsdata = (void *)newfd;
    353 		return (0);
    354 	}
    355 
    356 #ifdef NFS_DEBUG
    357 	if (debug)
    358 		printf("nfs_open: %s lookupfh failed: %s\n",
    359 			path, strerror(error));
    360 #endif
    361 	free(newfd, sizeof(*newfd));
    362 	return (error);
    363 }
    364 
    365 int
    366 nfs_close(f)
    367 	struct open_file *f;
    368 {
    369 	register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    370 
    371 #ifdef NFS_DEBUG
    372 	if (debug)
    373 		printf("nfs_close: fp=0x%x\n", fp);
    374 #endif
    375 
    376 	if (fp)
    377 		free(fp, sizeof(struct nfs_iodesc));
    378 	f->f_fsdata = (void *)0;
    379 
    380 	return (0);
    381 }
    382 
    383 /*
    384  * read a portion of a file
    385  */
    386 int
    387 nfs_read(f, buf, size, resid)
    388 	struct open_file *f;
    389 	void *buf;
    390 	size_t size;
    391 	size_t *resid;	/* out */
    392 {
    393 	register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    394 	register ssize_t cc;
    395 	register char *addr = buf;
    396 
    397 #ifdef NFS_DEBUG
    398 	if (debug)
    399 		printf("nfs_read: size=%d off=%d\n", size, (int)fp->off);
    400 #endif
    401 	while ((int)size > 0) {
    402 		twiddle();
    403 		cc = nfs_readdata(fp, fp->off, (void *)addr, size);
    404 		/* XXX maybe should retry on certain errors */
    405 		if (cc == -1) {
    406 #ifdef NFS_DEBUG
    407 			if (debug)
    408 				printf("nfs_read: read: %s", strerror(errno));
    409 #endif
    410 			return (errno);	/* XXX - from nfs_readdata */
    411 		}
    412 		if (cc == 0) {
    413 			if (debug)
    414 				printf("nfs_read: hit EOF unexpectantly");
    415 			goto ret;
    416 		}
    417 		fp->off += cc;
    418 		addr += cc;
    419 		size -= cc;
    420 	}
    421 ret:
    422 	if (resid)
    423 		*resid = size;
    424 
    425 	return (0);
    426 }
    427 
    428 /*
    429  * Not implemented.
    430  */
    431 int
    432 nfs_write(f, buf, size, resid)
    433 	struct open_file *f;
    434 	void *buf;
    435 	size_t size;
    436 	size_t *resid;	/* out */
    437 {
    438 	return (EROFS);
    439 }
    440 
    441 off_t
    442 nfs_seek(f, offset, where)
    443 	struct open_file *f;
    444 	off_t offset;
    445 	int where;
    446 {
    447 	register struct nfs_iodesc *d = (struct nfs_iodesc *)f->f_fsdata;
    448 	n_long size = ntohl(d->fa.fa_size);
    449 
    450 	switch (where) {
    451 	case SEEK_SET:
    452 		d->off = offset;
    453 		break;
    454 	case SEEK_CUR:
    455 		d->off += offset;
    456 		break;
    457 	case SEEK_END:
    458 		d->off = size - offset;
    459 		break;
    460 	default:
    461 		return (-1);
    462 	}
    463 
    464 	return (d->off);
    465 }
    466 
    467 /* NFNON=0, NFREG=1, NFDIR=2, NFBLK=3, NFCHR=4, NFLNK=5 */
    468 int nfs_stat_types[8] = {
    469 	0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 0 };
    470 
    471 int
    472 nfs_stat(f, sb)
    473 	struct open_file *f;
    474 	struct stat *sb;
    475 {
    476 	struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    477 	register n_long ftype, mode;
    478 
    479 	ftype = ntohl(fp->fa.fa_type);
    480 	mode  = ntohl(fp->fa.fa_mode);
    481 	mode |= nfs_stat_types[ftype & 7];
    482 
    483 	sb->st_mode  = mode;
    484 	sb->st_nlink = ntohl(fp->fa.fa_nlink);
    485 	sb->st_uid   = ntohl(fp->fa.fa_uid);
    486 	sb->st_gid   = ntohl(fp->fa.fa_gid);
    487 	sb->st_size  = ntohl(fp->fa.fa_size);
    488 
    489 	return (0);
    490 }
    491