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nfs.c revision 1.24 
      1 /*	$NetBSD: nfs.c,v 1.24 1999/02/11 09:10:44 pk 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 #ifdef _STANDALONE
     36 #include <lib/libkern/libkern.h>
     37 #else
     38 #include <string.h>
     39 #endif
     40 
     41 #include <netinet/in.h>
     42 #include <netinet/in_systm.h>
     43 
     44 #include "rpcv2.h"
     45 #include "nfsv2.h"
     46 
     47 #include "stand.h"
     48 #include "net.h"
     49 #include "netif.h"
     50 #include "nfs.h"
     51 #include "rpc.h"
     52 
     53 /* Define our own NFS attributes without NQNFS stuff. */
     54 struct nfsv2_fattrs {
     55 	n_long	fa_type;
     56 	n_long	fa_mode;
     57 	n_long	fa_nlink;
     58 	n_long	fa_uid;
     59 	n_long	fa_gid;
     60 	n_long	fa_size;
     61 	n_long	fa_blocksize;
     62 	n_long	fa_rdev;
     63 	n_long	fa_blocks;
     64 	n_long	fa_fsid;
     65 	n_long	fa_fileid;
     66 	struct nfsv2_time fa_atime;
     67 	struct nfsv2_time fa_mtime;
     68 	struct nfsv2_time fa_ctime;
     69 };
     70 
     71 
     72 struct nfs_read_args {
     73 	u_char	fh[NFS_FHSIZE];
     74 	n_long	off;
     75 	n_long	len;
     76 	n_long	xxx;			/* XXX what's this for? */
     77 };
     78 
     79 /* Data part of nfs rpc reply (also the largest thing we receive) */
     80 #define NFSREAD_SIZE 1024
     81 struct nfs_read_repl {
     82 	n_long	errno;
     83 	struct	nfsv2_fattrs fa;
     84 	n_long	count;
     85 	u_char	data[NFSREAD_SIZE];
     86 };
     87 
     88 #ifndef NFS_NOSYMLINK
     89 struct nfs_readlnk_repl {
     90 	n_long	errno;
     91 	n_long	len;
     92 	char	path[NFS_MAXPATHLEN];
     93 };
     94 #endif
     95 
     96 struct nfs_iodesc {
     97 	struct	iodesc	*iodesc;
     98 	off_t	off;
     99 	u_char	fh[NFS_FHSIZE];
    100 	struct nfsv2_fattrs fa;	/* all in network order */
    101 };
    102 
    103 struct nfs_iodesc nfs_root_node;
    104 
    105 int	nfs_getrootfh __P((struct iodesc *, char *, u_char *));
    106 int	nfs_lookupfh __P((struct nfs_iodesc *, char *, struct nfs_iodesc *));
    107 int	nfs_readlink __P((struct nfs_iodesc *, char *));
    108 ssize_t	nfs_readdata __P((struct nfs_iodesc *, off_t, void *, size_t));
    109 
    110 /*
    111  * Fetch the root file handle (call mount daemon)
    112  * On error, return non-zero and set errno.
    113  */
    114 int
    115 nfs_getrootfh(d, path, fhp)
    116 	register struct iodesc *d;
    117 	char *path;
    118 	u_char *fhp;
    119 {
    120 	register int len;
    121 	struct args {
    122 		n_long	len;
    123 		char	path[FNAME_SIZE];
    124 	} *args;
    125 	struct repl {
    126 		n_long	errno;
    127 		u_char	fh[NFS_FHSIZE];
    128 	} *repl;
    129 	struct {
    130 		n_long	h[RPC_HEADER_WORDS];
    131 		struct args d;
    132 	} sdata;
    133 	struct {
    134 		n_long	h[RPC_HEADER_WORDS];
    135 		struct repl d;
    136 	} rdata;
    137 	size_t cc;
    138 
    139 #ifdef NFS_DEBUG
    140 	if (debug)
    141 		printf("nfs_getrootfh: %s\n", path);
    142 #endif
    143 
    144 	args = &sdata.d;
    145 	repl = &rdata.d;
    146 
    147 	bzero(args, sizeof(*args));
    148 	len = strlen(path);
    149 	if (len > sizeof(args->path))
    150 		len = sizeof(args->path);
    151 	args->len = htonl(len);
    152 	bcopy(path, args->path, len);
    153 	len = 4 + roundup(len, 4);
    154 
    155 	cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT,
    156 	    args, len, repl, sizeof(*repl));
    157 	if (cc == -1) {
    158 		/* errno was set by rpc_call */
    159 		return (-1);
    160 	}
    161 	if (cc < 4) {
    162 		errno = EBADRPC;
    163 		return (-1);
    164 	}
    165 	if (repl->errno) {
    166 		errno = ntohl(repl->errno);
    167 		return (-1);
    168 	}
    169 	bcopy(repl->fh, fhp, sizeof(repl->fh));
    170 	return (0);
    171 }
    172 
    173 /*
    174  * Lookup a file.  Store handle and attributes.
    175  * Return zero or error number.
    176  */
    177 int
    178 nfs_lookupfh(d, name, newfd)
    179 	struct nfs_iodesc *d;
    180 	char *name;
    181 	struct nfs_iodesc *newfd;
    182 {
    183 	register int len, rlen;
    184 	struct args {
    185 		u_char	fh[NFS_FHSIZE];
    186 		n_long	len;
    187 		char	name[FNAME_SIZE];
    188 	} *args;
    189 	struct repl {
    190 		n_long	errno;
    191 		u_char	fh[NFS_FHSIZE];
    192 		struct	nfsv2_fattrs fa;
    193 	} *repl;
    194 	struct {
    195 		n_long	h[RPC_HEADER_WORDS];
    196 		struct args d;
    197 	} sdata;
    198 	struct {
    199 		n_long	h[RPC_HEADER_WORDS];
    200 		struct repl d;
    201 	} rdata;
    202 	ssize_t cc;
    203 
    204 #ifdef NFS_DEBUG
    205 	if (debug)
    206 		printf("lookupfh: called\n");
    207 #endif
    208 
    209 	args = &sdata.d;
    210 	repl = &rdata.d;
    211 
    212 	bzero(args, sizeof(*args));
    213 	bcopy(d->fh, args->fh, sizeof(args->fh));
    214 	len = strlen(name);
    215 	if (len > sizeof(args->name))
    216 		len = sizeof(args->name);
    217 	bcopy(name, args->name, len);
    218 	args->len = htonl(len);
    219 	len = 4 + roundup(len, 4);
    220 	len += NFS_FHSIZE;
    221 
    222 	rlen = sizeof(*repl);
    223 
    224 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_LOOKUP,
    225 	    args, len, repl, rlen);
    226 	if (cc == -1)
    227 		return (errno);		/* XXX - from rpc_call */
    228 	if (cc < 4)
    229 		return (EIO);
    230 	if (repl->errno) {
    231 		/* saerrno.h now matches NFS error numbers. */
    232 		return (ntohl(repl->errno));
    233 	}
    234 	bcopy( repl->fh, &newfd->fh, sizeof(newfd->fh));
    235 	bcopy(&repl->fa, &newfd->fa, sizeof(newfd->fa));
    236 	return (0);
    237 }
    238 
    239 #ifndef NFS_NOSYMLINK
    240 /*
    241  * Get the destination of a symbolic link.
    242  */
    243 int
    244 nfs_readlink(d, buf)
    245 	struct nfs_iodesc *d;
    246 	char *buf;
    247 {
    248 	struct {
    249 		n_long	h[RPC_HEADER_WORDS];
    250 		u_char fh[NFS_FHSIZE];
    251 	} sdata;
    252 	struct {
    253 		n_long	h[RPC_HEADER_WORDS];
    254 		struct nfs_readlnk_repl d;
    255 	} rdata;
    256 	ssize_t cc;
    257 
    258 #ifdef NFS_DEBUG
    259 	if (debug)
    260 		printf("readlink: called\n");
    261 #endif
    262 
    263 	bcopy(d->fh, sdata.fh, NFS_FHSIZE);
    264 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READLINK,
    265 		      sdata.fh, NFS_FHSIZE,
    266 		      &rdata.d, sizeof(rdata.d));
    267 	if (cc == -1)
    268 		return (errno);
    269 
    270 	if (cc < 4)
    271 		return (EIO);
    272 
    273 	if (rdata.d.errno)
    274 		return (ntohl(rdata.d.errno));
    275 
    276 	rdata.d.len = ntohl(rdata.d.len);
    277 	if (rdata.d.len > NFS_MAXPATHLEN)
    278 		return (ENAMETOOLONG);
    279 
    280 	bcopy(rdata.d.path, buf, rdata.d.len);
    281 	buf[rdata.d.len] = 0;
    282 	return (0);
    283 }
    284 #endif
    285 
    286 /*
    287  * Read data from a file.
    288  * Return transfer count or -1 (and set errno)
    289  */
    290 ssize_t
    291 nfs_readdata(d, off, addr, len)
    292 	struct nfs_iodesc *d;
    293 	off_t off;
    294 	void *addr;
    295 	size_t len;
    296 {
    297 	struct nfs_read_args *args;
    298 	struct nfs_read_repl *repl;
    299 	struct {
    300 		n_long	h[RPC_HEADER_WORDS];
    301 		struct nfs_read_args d;
    302 	} sdata;
    303 	struct {
    304 		n_long	h[RPC_HEADER_WORDS];
    305 		struct nfs_read_repl d;
    306 	} rdata;
    307 	size_t cc;
    308 	long x;
    309 	int hlen, rlen;
    310 
    311 	args = &sdata.d;
    312 	repl = &rdata.d;
    313 
    314 	bcopy(d->fh, args->fh, NFS_FHSIZE);
    315 	args->off = htonl((n_long)off);
    316 	if (len > NFSREAD_SIZE)
    317 		len = NFSREAD_SIZE;
    318 	args->len = htonl((n_long)len);
    319 	args->xxx = htonl((n_long)0);
    320 	hlen = sizeof(*repl) - NFSREAD_SIZE;
    321 
    322 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READ,
    323 	    args, sizeof(*args),
    324 	    repl, sizeof(*repl));
    325 	if (cc == -1) {
    326 		/* errno was already set by rpc_call */
    327 		return (-1);
    328 	}
    329 	if (cc < hlen) {
    330 		errno = EBADRPC;
    331 		return (-1);
    332 	}
    333 	if (repl->errno) {
    334 		errno = ntohl(repl->errno);
    335 		return (-1);
    336 	}
    337 	rlen = cc - hlen;
    338 	x = ntohl(repl->count);
    339 	if (rlen < x) {
    340 		printf("nfsread: short packet, %d < %ld\n", rlen, x);
    341 		errno = EBADRPC;
    342 		return(-1);
    343 	}
    344 	bcopy(repl->data, addr, x);
    345 	return (x);
    346 }
    347 
    348 /*
    349  * nfs_mount - mount this nfs filesystem to a host
    350  * On error, return non-zero and set errno.
    351  */
    352 int
    353 nfs_mount(sock, ip, path)
    354 	int sock;
    355 	struct in_addr ip;
    356 	char *path;
    357 {
    358 	struct iodesc *desc;
    359 	struct nfsv2_fattrs *fa;
    360 
    361 	if (!(desc = socktodesc(sock))) {
    362 		errno = EINVAL;
    363 		return(-1);
    364 	}
    365 
    366 	/* Bind to a reserved port. */
    367 	desc->myport = htons(--rpc_port);
    368 	desc->destip = ip;
    369 	if (nfs_getrootfh(desc, path, nfs_root_node.fh))
    370 		return (-1);
    371 	nfs_root_node.iodesc = desc;
    372 	/* Fake up attributes for the root dir. */
    373 	fa = &nfs_root_node.fa;
    374 	fa->fa_type  = htonl(NFDIR);
    375 	fa->fa_mode  = htonl(0755);
    376 	fa->fa_nlink = htonl(2);
    377 
    378 #ifdef NFS_DEBUG
    379 	if (debug)
    380 		printf("nfs_mount: got fh for %s\n", path);
    381 #endif
    382 
    383 	return(0);
    384 }
    385 
    386 /*
    387  * Open a file.
    388  * return zero or error number
    389  */
    390 int
    391 nfs_open(path, f)
    392 	char *path;
    393 	struct open_file *f;
    394 {
    395 	struct nfs_iodesc *newfd, *currfd;
    396 #ifndef NFS_NOSYMLINK
    397 	register char *cp, *ncp;
    398 	register int c;
    399 	char namebuf[NFS_MAXPATHLEN + 1];
    400 	char linkbuf[NFS_MAXPATHLEN + 1];
    401 	int nlinks = 0;
    402 #endif
    403 	int error = 0;
    404 
    405 #ifdef NFS_DEBUG
    406  	if (debug)
    407  	    printf("nfs_open: %s\n", path);
    408 #endif
    409 	if (nfs_root_node.iodesc == NULL) {
    410 		printf("nfs_open: must mount first.\n");
    411 		return (ENXIO);
    412 	}
    413 
    414 	currfd = &nfs_root_node;
    415 	newfd = 0;
    416 
    417 #ifndef NFS_NOSYMLINK
    418 	cp = path;
    419 	while (*cp) {
    420 		/*
    421 		 * Remove extra separators
    422 		 */
    423 		while (*cp == '/')
    424 			cp++;
    425 
    426 		if (*cp == '\0')
    427 			break;
    428 		/*
    429 		 * Check that current node is a directory.
    430 		 */
    431 		if (currfd->fa.fa_type != htonl(NFDIR)) {
    432 			error = ENOTDIR;
    433 			goto out;
    434 		}
    435 
    436 		/* allocate file system specific data structure */
    437 		newfd = alloc(sizeof(*newfd));
    438 		newfd->iodesc = currfd->iodesc;
    439 		newfd->off = 0;
    440 
    441 		/*
    442 		 * Get next component of path name.
    443 		 */
    444 		{
    445 			register int len = 0;
    446 
    447 			ncp = cp;
    448 			while ((c = *cp) != '\0' && c != '/') {
    449 				if (++len > NFS_MAXNAMLEN) {
    450 					error = ENOENT;
    451 					goto out;
    452 				}
    453 				cp++;
    454 			}
    455 			*cp = '\0';
    456 		}
    457 
    458 		/* lookup a file handle */
    459 		error = nfs_lookupfh(currfd, ncp, newfd);
    460 		*cp = c;
    461 		if (error)
    462 			goto out;
    463 
    464 		/*
    465 		 * Check for symbolic link
    466 		 */
    467 		if (newfd->fa.fa_type == htonl(NFLNK)) {
    468 			int link_len, len;
    469 
    470 			error = nfs_readlink(newfd, linkbuf);
    471 			if (error)
    472 				goto out;
    473 
    474 			link_len = strlen(linkbuf);
    475 			len = strlen(cp);
    476 
    477 			if (link_len + len > MAXPATHLEN
    478 			    || ++nlinks > MAXSYMLINKS) {
    479 				error = ENOENT;
    480 				goto out;
    481 			}
    482 
    483 			bcopy(cp, &namebuf[link_len], len + 1);
    484 			bcopy(linkbuf, namebuf, link_len);
    485 
    486 			/*
    487 			 * If absolute pathname, restart at root.
    488 			 * If relative pathname, restart at parent directory.
    489 			 */
    490 			cp = namebuf;
    491 			if (*cp == '/') {
    492 				if (currfd != &nfs_root_node)
    493 					free(currfd, sizeof(*currfd));
    494 				currfd = &nfs_root_node;
    495 			}
    496 
    497 			free(newfd, sizeof(*newfd));
    498 			newfd = 0;
    499 
    500 			continue;
    501 		}
    502 
    503 		if (currfd != &nfs_root_node)
    504 			free(currfd, sizeof(*currfd));
    505 		currfd = newfd;
    506 		newfd = 0;
    507 	}
    508 
    509 	error = 0;
    510 
    511 out:
    512 #else
    513         /* allocate file system specific data structure */
    514         currfd = alloc(sizeof(*currfd));
    515         currfd->iodesc = nfs_root_node.iodesc;
    516         currfd->off = 0;
    517 
    518         error = nfs_lookupfh(&nfs_root_node, path, currfd);
    519 #endif
    520 	if (!error) {
    521 		f->f_fsdata = (void *)currfd;
    522 		return (0);
    523 	}
    524 
    525 #ifdef NFS_DEBUG
    526 	if (debug)
    527 		printf("nfs_open: %s lookupfh failed: %s\n",
    528 		    path, strerror(error));
    529 #endif
    530 	if (currfd != &nfs_root_node)
    531 		free(currfd, sizeof(*currfd));
    532 	if (newfd)
    533 		free(newfd, sizeof(*newfd));
    534 
    535 	return (error);
    536 }
    537 
    538 int
    539 nfs_close(f)
    540 	struct open_file *f;
    541 {
    542 	register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    543 
    544 #ifdef NFS_DEBUG
    545 	if (debug)
    546 		printf("nfs_close: fp=0x%lx\n", (u_long)fp);
    547 #endif
    548 
    549 	if (fp)
    550 		free(fp, sizeof(struct nfs_iodesc));
    551 	f->f_fsdata = (void *)0;
    552 
    553 	return (0);
    554 }
    555 
    556 /*
    557  * read a portion of a file
    558  */
    559 int
    560 nfs_read(f, buf, size, resid)
    561 	struct open_file *f;
    562 	void *buf;
    563 	size_t size;
    564 	size_t *resid;	/* out */
    565 {
    566 	register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    567 	register ssize_t cc;
    568 	register char *addr = buf;
    569 
    570 #ifdef NFS_DEBUG
    571 	if (debug)
    572 		printf("nfs_read: size=%lu off=%d\n", (u_long)size,
    573 		    (int)fp->off);
    574 #endif
    575 	while ((int)size > 0) {
    576 		twiddle();
    577 		cc = nfs_readdata(fp, fp->off, (void *)addr, size);
    578 		/* XXX maybe should retry on certain errors */
    579 		if (cc == -1) {
    580 #ifdef NFS_DEBUG
    581 			if (debug)
    582 				printf("nfs_read: read: %s", strerror(errno));
    583 #endif
    584 			return (errno);	/* XXX - from nfs_readdata */
    585 		}
    586 		if (cc == 0) {
    587 #ifdef NFS_DEBUG
    588 			if (debug)
    589 				printf("nfs_read: hit EOF unexpectantly");
    590 #endif
    591 			goto ret;
    592 		}
    593 		fp->off += cc;
    594 		addr += cc;
    595 		size -= cc;
    596 	}
    597 ret:
    598 	if (resid)
    599 		*resid = size;
    600 
    601 	return (0);
    602 }
    603 
    604 /*
    605  * Not implemented.
    606  */
    607 int
    608 nfs_write(f, buf, size, resid)
    609 	struct open_file *f;
    610 	void *buf;
    611 	size_t size;
    612 	size_t *resid;	/* out */
    613 {
    614 	return (EROFS);
    615 }
    616 
    617 off_t
    618 nfs_seek(f, offset, where)
    619 	struct open_file *f;
    620 	off_t offset;
    621 	int where;
    622 {
    623 	register struct nfs_iodesc *d = (struct nfs_iodesc *)f->f_fsdata;
    624 	n_long size = ntohl(d->fa.fa_size);
    625 
    626 	switch (where) {
    627 	case SEEK_SET:
    628 		d->off = offset;
    629 		break;
    630 	case SEEK_CUR:
    631 		d->off += offset;
    632 		break;
    633 	case SEEK_END:
    634 		d->off = size - offset;
    635 		break;
    636 	default:
    637 		return (-1);
    638 	}
    639 
    640 	return (d->off);
    641 }
    642 
    643 /* NFNON=0, NFREG=1, NFDIR=2, NFBLK=3, NFCHR=4, NFLNK=5 */
    644 int nfs_stat_types[8] = {
    645 	0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 0 };
    646 
    647 int
    648 nfs_stat(f, sb)
    649 	struct open_file *f;
    650 	struct stat *sb;
    651 {
    652 	struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    653 	register n_long ftype, mode;
    654 
    655 	ftype = ntohl(fp->fa.fa_type);
    656 	mode  = ntohl(fp->fa.fa_mode);
    657 	mode |= nfs_stat_types[ftype & 7];
    658 
    659 	sb->st_mode  = mode;
    660 	sb->st_nlink = ntohl(fp->fa.fa_nlink);
    661 	sb->st_uid   = ntohl(fp->fa.fa_uid);
    662 	sb->st_gid   = ntohl(fp->fa.fa_gid);
    663 	sb->st_size  = ntohl(fp->fa.fa_size);
    664 
    665 	return (0);
    666 }
    667