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nfs.c revision 1.23 
      1 /*	$NetBSD: nfs.c,v 1.23 1998/01/23 19:27:44 thorpej 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 
    106 /*
    107  * Fetch the root file handle (call mount daemon)
    108  * On error, return non-zero and set errno.
    109  */
    110 int
    111 nfs_getrootfh(d, path, fhp)
    112 	register struct iodesc *d;
    113 	char *path;
    114 	u_char *fhp;
    115 {
    116 	register int len;
    117 	struct args {
    118 		n_long	len;
    119 		char	path[FNAME_SIZE];
    120 	} *args;
    121 	struct repl {
    122 		n_long	errno;
    123 		u_char	fh[NFS_FHSIZE];
    124 	} *repl;
    125 	struct {
    126 		n_long	h[RPC_HEADER_WORDS];
    127 		struct args d;
    128 	} sdata;
    129 	struct {
    130 		n_long	h[RPC_HEADER_WORDS];
    131 		struct repl d;
    132 	} rdata;
    133 	size_t cc;
    134 
    135 #ifdef NFS_DEBUG
    136 	if (debug)
    137 		printf("nfs_getrootfh: %s\n", path);
    138 #endif
    139 
    140 	args = &sdata.d;
    141 	repl = &rdata.d;
    142 
    143 	bzero(args, sizeof(*args));
    144 	len = strlen(path);
    145 	if (len > sizeof(args->path))
    146 		len = sizeof(args->path);
    147 	args->len = htonl(len);
    148 	bcopy(path, args->path, len);
    149 	len = 4 + roundup(len, 4);
    150 
    151 	cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT,
    152 	    args, len, repl, sizeof(*repl));
    153 	if (cc == -1) {
    154 		/* errno was set by rpc_call */
    155 		return (-1);
    156 	}
    157 	if (cc < 4) {
    158 		errno = EBADRPC;
    159 		return (-1);
    160 	}
    161 	if (repl->errno) {
    162 		errno = ntohl(repl->errno);
    163 		return (-1);
    164 	}
    165 	bcopy(repl->fh, fhp, sizeof(repl->fh));
    166 	return (0);
    167 }
    168 
    169 /*
    170  * Lookup a file.  Store handle and attributes.
    171  * Return zero or error number.
    172  */
    173 int
    174 nfs_lookupfh(d, name, newfd)
    175 	struct nfs_iodesc *d;
    176 	char *name;
    177 	struct nfs_iodesc *newfd;
    178 {
    179 	register int len, rlen;
    180 	struct args {
    181 		u_char	fh[NFS_FHSIZE];
    182 		n_long	len;
    183 		char	name[FNAME_SIZE];
    184 	} *args;
    185 	struct repl {
    186 		n_long	errno;
    187 		u_char	fh[NFS_FHSIZE];
    188 		struct	nfsv2_fattrs fa;
    189 	} *repl;
    190 	struct {
    191 		n_long	h[RPC_HEADER_WORDS];
    192 		struct args d;
    193 	} sdata;
    194 	struct {
    195 		n_long	h[RPC_HEADER_WORDS];
    196 		struct repl d;
    197 	} rdata;
    198 	ssize_t cc;
    199 
    200 #ifdef NFS_DEBUG
    201 	if (debug)
    202 		printf("lookupfh: called\n");
    203 #endif
    204 
    205 	args = &sdata.d;
    206 	repl = &rdata.d;
    207 
    208 	bzero(args, sizeof(*args));
    209 	bcopy(d->fh, args->fh, sizeof(args->fh));
    210 	len = strlen(name);
    211 	if (len > sizeof(args->name))
    212 		len = sizeof(args->name);
    213 	bcopy(name, args->name, len);
    214 	args->len = htonl(len);
    215 	len = 4 + roundup(len, 4);
    216 	len += NFS_FHSIZE;
    217 
    218 	rlen = sizeof(*repl);
    219 
    220 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_LOOKUP,
    221 	    args, len, repl, rlen);
    222 	if (cc == -1)
    223 		return (errno);		/* XXX - from rpc_call */
    224 	if (cc < 4)
    225 		return (EIO);
    226 	if (repl->errno) {
    227 		/* saerrno.h now matches NFS error numbers. */
    228 		return (ntohl(repl->errno));
    229 	}
    230 	bcopy( repl->fh, &newfd->fh, sizeof(newfd->fh));
    231 	bcopy(&repl->fa, &newfd->fa, sizeof(newfd->fa));
    232 	return (0);
    233 }
    234 
    235 #ifndef NFS_NOSYMLINK
    236 /*
    237  * Get the destination of a symbolic link.
    238  */
    239 int
    240 nfs_readlink(d, buf)
    241 	struct nfs_iodesc *d;
    242 	char *buf;
    243 {
    244 	struct {
    245 		n_long	h[RPC_HEADER_WORDS];
    246 		u_char fh[NFS_FHSIZE];
    247 	} sdata;
    248 	struct {
    249 		n_long	h[RPC_HEADER_WORDS];
    250 		struct nfs_readlnk_repl d;
    251 	} rdata;
    252 	ssize_t cc;
    253 
    254 #ifdef NFS_DEBUG
    255 	if (debug)
    256 		printf("readlink: called\n");
    257 #endif
    258 
    259 	bcopy(d->fh, sdata.fh, NFS_FHSIZE);
    260 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READLINK,
    261 		      sdata.fh, NFS_FHSIZE,
    262 		      &rdata.d, sizeof(rdata.d));
    263 	if (cc == -1)
    264 		return (errno);
    265 
    266 	if (cc < 4)
    267 		return (EIO);
    268 
    269 	if (rdata.d.errno)
    270 		return (ntohl(rdata.d.errno));
    271 
    272 	rdata.d.len = ntohl(rdata.d.len);
    273 	if (rdata.d.len > NFS_MAXPATHLEN)
    274 		return (ENAMETOOLONG);
    275 
    276 	bcopy(rdata.d.path, buf, rdata.d.len);
    277 	buf[rdata.d.len] = 0;
    278 	return (0);
    279 }
    280 #endif
    281 
    282 /*
    283  * Read data from a file.
    284  * Return transfer count or -1 (and set errno)
    285  */
    286 ssize_t
    287 nfs_readdata(d, off, addr, len)
    288 	struct nfs_iodesc *d;
    289 	off_t off;
    290 	void *addr;
    291 	size_t len;
    292 {
    293 	struct nfs_read_args *args;
    294 	struct nfs_read_repl *repl;
    295 	struct {
    296 		n_long	h[RPC_HEADER_WORDS];
    297 		struct nfs_read_args d;
    298 	} sdata;
    299 	struct {
    300 		n_long	h[RPC_HEADER_WORDS];
    301 		struct nfs_read_repl d;
    302 	} rdata;
    303 	size_t cc;
    304 	long x;
    305 	int hlen, rlen;
    306 
    307 	args = &sdata.d;
    308 	repl = &rdata.d;
    309 
    310 	bcopy(d->fh, args->fh, NFS_FHSIZE);
    311 	args->off = htonl((n_long)off);
    312 	if (len > NFSREAD_SIZE)
    313 		len = NFSREAD_SIZE;
    314 	args->len = htonl((n_long)len);
    315 	args->xxx = htonl((n_long)0);
    316 	hlen = sizeof(*repl) - NFSREAD_SIZE;
    317 
    318 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READ,
    319 	    args, sizeof(*args),
    320 	    repl, sizeof(*repl));
    321 	if (cc == -1) {
    322 		/* errno was already set by rpc_call */
    323 		return (-1);
    324 	}
    325 	if (cc < hlen) {
    326 		errno = EBADRPC;
    327 		return (-1);
    328 	}
    329 	if (repl->errno) {
    330 		errno = ntohl(repl->errno);
    331 		return (-1);
    332 	}
    333 	rlen = cc - hlen;
    334 	x = ntohl(repl->count);
    335 	if (rlen < x) {
    336 		printf("nfsread: short packet, %d < %ld\n", rlen, x);
    337 		errno = EBADRPC;
    338 		return(-1);
    339 	}
    340 	bcopy(repl->data, addr, x);
    341 	return (x);
    342 }
    343 
    344 /*
    345  * nfs_mount - mount this nfs filesystem to a host
    346  * On error, return non-zero and set errno.
    347  */
    348 int
    349 nfs_mount(sock, ip, path)
    350 	int sock;
    351 	struct in_addr ip;
    352 	char *path;
    353 {
    354 	struct iodesc *desc;
    355 	struct nfsv2_fattrs *fa;
    356 
    357 	if (!(desc = socktodesc(sock))) {
    358 		errno = EINVAL;
    359 		return(-1);
    360 	}
    361 
    362 	/* Bind to a reserved port. */
    363 	desc->myport = htons(--rpc_port);
    364 	desc->destip = ip;
    365 	if (nfs_getrootfh(desc, path, nfs_root_node.fh))
    366 		return (-1);
    367 	nfs_root_node.iodesc = desc;
    368 	/* Fake up attributes for the root dir. */
    369 	fa = &nfs_root_node.fa;
    370 	fa->fa_type  = htonl(NFDIR);
    371 	fa->fa_mode  = htonl(0755);
    372 	fa->fa_nlink = htonl(2);
    373 
    374 #ifdef NFS_DEBUG
    375 	if (debug)
    376 		printf("nfs_mount: got fh for %s\n", path);
    377 #endif
    378 
    379 	return(0);
    380 }
    381 
    382 /*
    383  * Open a file.
    384  * return zero or error number
    385  */
    386 int
    387 nfs_open(path, f)
    388 	char *path;
    389 	struct open_file *f;
    390 {
    391 	struct nfs_iodesc *newfd, *currfd;
    392 #ifndef NFS_NOSYMLINK
    393 	register char *cp, *ncp;
    394 	register int c;
    395 	char namebuf[NFS_MAXPATHLEN + 1];
    396 	char linkbuf[NFS_MAXPATHLEN + 1];
    397 	int nlinks = 0;
    398 #endif
    399 	int error = 0;
    400 
    401 #ifdef NFS_DEBUG
    402  	if (debug)
    403  	    printf("nfs_open: %s\n", path);
    404 #endif
    405 	if (nfs_root_node.iodesc == NULL) {
    406 		printf("nfs_open: must mount first.\n");
    407 		return (ENXIO);
    408 	}
    409 
    410 	currfd = &nfs_root_node;
    411 	newfd = 0;
    412 
    413 #ifndef NFS_NOSYMLINK
    414 	cp = path;
    415 	while (*cp) {
    416 		/*
    417 		 * Remove extra separators
    418 		 */
    419 		while (*cp == '/')
    420 			cp++;
    421 
    422 		if (*cp == '\0')
    423 			break;
    424 		/*
    425 		 * Check that current node is a directory.
    426 		 */
    427 		if (currfd->fa.fa_type != htonl(NFDIR)) {
    428 			error = ENOTDIR;
    429 			goto out;
    430 		}
    431 
    432 		/* allocate file system specific data structure */
    433 		newfd = alloc(sizeof(*newfd));
    434 		newfd->iodesc = currfd->iodesc;
    435 		newfd->off = 0;
    436 
    437 		/*
    438 		 * Get next component of path name.
    439 		 */
    440 		{
    441 			register int len = 0;
    442 
    443 			ncp = cp;
    444 			while ((c = *cp) != '\0' && c != '/') {
    445 				if (++len > NFS_MAXNAMLEN) {
    446 					error = ENOENT;
    447 					goto out;
    448 				}
    449 				cp++;
    450 			}
    451 			*cp = '\0';
    452 		}
    453 
    454 		/* lookup a file handle */
    455 		error = nfs_lookupfh(currfd, ncp, newfd);
    456 		*cp = c;
    457 		if (error)
    458 			goto out;
    459 
    460 		/*
    461 		 * Check for symbolic link
    462 		 */
    463 		if (newfd->fa.fa_type == htonl(NFLNK)) {
    464 			int link_len, len;
    465 
    466 			error = nfs_readlink(newfd, linkbuf);
    467 			if (error)
    468 				goto out;
    469 
    470 			link_len = strlen(linkbuf);
    471 			len = strlen(cp);
    472 
    473 			if (link_len + len > MAXPATHLEN
    474 			    || ++nlinks > MAXSYMLINKS) {
    475 				error = ENOENT;
    476 				goto out;
    477 			}
    478 
    479 			bcopy(cp, &namebuf[link_len], len + 1);
    480 			bcopy(linkbuf, namebuf, link_len);
    481 
    482 			/*
    483 			 * If absolute pathname, restart at root.
    484 			 * If relative pathname, restart at parent directory.
    485 			 */
    486 			cp = namebuf;
    487 			if (*cp == '/') {
    488 				if (currfd != &nfs_root_node)
    489 					free(currfd, sizeof(*currfd));
    490 				currfd = &nfs_root_node;
    491 			}
    492 
    493 			free(newfd, sizeof(*newfd));
    494 			newfd = 0;
    495 
    496 			continue;
    497 		}
    498 
    499 		if (currfd != &nfs_root_node)
    500 			free(currfd, sizeof(*currfd));
    501 		currfd = newfd;
    502 		newfd = 0;
    503 	}
    504 
    505 	error = 0;
    506 
    507 out:
    508 #else
    509         /* allocate file system specific data structure */
    510         currfd = alloc(sizeof(*currfd));
    511         currfd->iodesc = nfs_root_node.iodesc;
    512         currfd->off = 0;
    513 
    514         error = nfs_lookupfh(&nfs_root_node, path, currfd);
    515 #endif
    516 	if (!error) {
    517 		f->f_fsdata = (void *)currfd;
    518 		return (0);
    519 	}
    520 
    521 #ifdef NFS_DEBUG
    522 	if (debug)
    523 		printf("nfs_open: %s lookupfh failed: %s\n",
    524 		    path, strerror(error));
    525 #endif
    526 	if (currfd != &nfs_root_node)
    527 		free(currfd, sizeof(*currfd));
    528 	if (newfd)
    529 		free(newfd, sizeof(*newfd));
    530 
    531 	return (error);
    532 }
    533 
    534 int
    535 nfs_close(f)
    536 	struct open_file *f;
    537 {
    538 	register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    539 
    540 #ifdef NFS_DEBUG
    541 	if (debug)
    542 		printf("nfs_close: fp=0x%lx\n", (u_long)fp);
    543 #endif
    544 
    545 	if (fp)
    546 		free(fp, sizeof(struct nfs_iodesc));
    547 	f->f_fsdata = (void *)0;
    548 
    549 	return (0);
    550 }
    551 
    552 /*
    553  * read a portion of a file
    554  */
    555 int
    556 nfs_read(f, buf, size, resid)
    557 	struct open_file *f;
    558 	void *buf;
    559 	size_t size;
    560 	size_t *resid;	/* out */
    561 {
    562 	register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    563 	register ssize_t cc;
    564 	register char *addr = buf;
    565 
    566 #ifdef NFS_DEBUG
    567 	if (debug)
    568 		printf("nfs_read: size=%lu off=%d\n", (u_long)size,
    569 		    (int)fp->off);
    570 #endif
    571 	while ((int)size > 0) {
    572 		twiddle();
    573 		cc = nfs_readdata(fp, fp->off, (void *)addr, size);
    574 		/* XXX maybe should retry on certain errors */
    575 		if (cc == -1) {
    576 #ifdef NFS_DEBUG
    577 			if (debug)
    578 				printf("nfs_read: read: %s", strerror(errno));
    579 #endif
    580 			return (errno);	/* XXX - from nfs_readdata */
    581 		}
    582 		if (cc == 0) {
    583 #ifdef NFS_DEBUG
    584 			if (debug)
    585 				printf("nfs_read: hit EOF unexpectantly");
    586 #endif
    587 			goto ret;
    588 		}
    589 		fp->off += cc;
    590 		addr += cc;
    591 		size -= cc;
    592 	}
    593 ret:
    594 	if (resid)
    595 		*resid = size;
    596 
    597 	return (0);
    598 }
    599 
    600 /*
    601  * Not implemented.
    602  */
    603 int
    604 nfs_write(f, buf, size, resid)
    605 	struct open_file *f;
    606 	void *buf;
    607 	size_t size;
    608 	size_t *resid;	/* out */
    609 {
    610 	return (EROFS);
    611 }
    612 
    613 off_t
    614 nfs_seek(f, offset, where)
    615 	struct open_file *f;
    616 	off_t offset;
    617 	int where;
    618 {
    619 	register struct nfs_iodesc *d = (struct nfs_iodesc *)f->f_fsdata;
    620 	n_long size = ntohl(d->fa.fa_size);
    621 
    622 	switch (where) {
    623 	case SEEK_SET:
    624 		d->off = offset;
    625 		break;
    626 	case SEEK_CUR:
    627 		d->off += offset;
    628 		break;
    629 	case SEEK_END:
    630 		d->off = size - offset;
    631 		break;
    632 	default:
    633 		return (-1);
    634 	}
    635 
    636 	return (d->off);
    637 }
    638 
    639 /* NFNON=0, NFREG=1, NFDIR=2, NFBLK=3, NFCHR=4, NFLNK=5 */
    640 int nfs_stat_types[8] = {
    641 	0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 0 };
    642 
    643 int
    644 nfs_stat(f, sb)
    645 	struct open_file *f;
    646 	struct stat *sb;
    647 {
    648 	struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    649 	register n_long ftype, mode;
    650 
    651 	ftype = ntohl(fp->fa.fa_type);
    652 	mode  = ntohl(fp->fa.fa_mode);
    653 	mode |= nfs_stat_types[ftype & 7];
    654 
    655 	sb->st_mode  = mode;
    656 	sb->st_nlink = ntohl(fp->fa.fa_nlink);
    657 	sb->st_uid   = ntohl(fp->fa.fa_uid);
    658 	sb->st_gid   = ntohl(fp->fa.fa_gid);
    659 	sb->st_size  = ntohl(fp->fa.fa_size);
    660 
    661 	return (0);
    662 }
    663