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nfs.c revision 1.21 
      1 /*	$NetBSD: nfs.c,v 1.21 1997/06/16 20:47:11 drochner 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 #ifndef NFS_NOSYMLINK
     85 struct nfs_readlnk_repl {
     86 	n_long	errno;
     87 	n_long	len;
     88 	char	path[NFS_MAXPATHLEN];
     89 };
     90 #endif
     91 
     92 struct nfs_iodesc {
     93 	struct	iodesc	*iodesc;
     94 	off_t	off;
     95 	u_char	fh[NFS_FHSIZE];
     96 	struct nfsv2_fattrs fa;	/* all in network order */
     97 };
     98 
     99 struct nfs_iodesc nfs_root_node;
    100 
    101 
    102 /*
    103  * Fetch the root file handle (call mount daemon)
    104  * On error, return non-zero and set errno.
    105  */
    106 int
    107 nfs_getrootfh(d, path, fhp)
    108 	register struct iodesc *d;
    109 	char *path;
    110 	u_char *fhp;
    111 {
    112 	register int len;
    113 	struct args {
    114 		n_long	len;
    115 		char	path[FNAME_SIZE];
    116 	} *args;
    117 	struct repl {
    118 		n_long	errno;
    119 		u_char	fh[NFS_FHSIZE];
    120 	} *repl;
    121 	struct {
    122 		n_long	h[RPC_HEADER_WORDS];
    123 		struct args d;
    124 	} sdata;
    125 	struct {
    126 		n_long	h[RPC_HEADER_WORDS];
    127 		struct repl d;
    128 	} rdata;
    129 	size_t cc;
    130 
    131 #ifdef NFS_DEBUG
    132 	if (debug)
    133 		printf("nfs_getrootfh: %s\n", path);
    134 #endif
    135 
    136 	args = &sdata.d;
    137 	repl = &rdata.d;
    138 
    139 	bzero(args, sizeof(*args));
    140 	len = strlen(path);
    141 	if (len > sizeof(args->path))
    142 		len = sizeof(args->path);
    143 	args->len = htonl(len);
    144 	bcopy(path, args->path, len);
    145 	len = 4 + roundup(len, 4);
    146 
    147 	cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT,
    148 	    args, len, repl, sizeof(*repl));
    149 	if (cc == -1) {
    150 		/* errno was set by rpc_call */
    151 		return (-1);
    152 	}
    153 	if (cc < 4) {
    154 		errno = EBADRPC;
    155 		return (-1);
    156 	}
    157 	if (repl->errno) {
    158 		errno = ntohl(repl->errno);
    159 		return (-1);
    160 	}
    161 	bcopy(repl->fh, fhp, sizeof(repl->fh));
    162 	return (0);
    163 }
    164 
    165 /*
    166  * Lookup a file.  Store handle and attributes.
    167  * Return zero or error number.
    168  */
    169 int
    170 nfs_lookupfh(d, name, newfd)
    171 	struct nfs_iodesc *d;
    172 	char *name;
    173 	struct nfs_iodesc *newfd;
    174 {
    175 	register int len, rlen;
    176 	struct args {
    177 		u_char	fh[NFS_FHSIZE];
    178 		n_long	len;
    179 		char	name[FNAME_SIZE];
    180 	} *args;
    181 	struct repl {
    182 		n_long	errno;
    183 		u_char	fh[NFS_FHSIZE];
    184 		struct	nfsv2_fattrs fa;
    185 	} *repl;
    186 	struct {
    187 		n_long	h[RPC_HEADER_WORDS];
    188 		struct args d;
    189 	} sdata;
    190 	struct {
    191 		n_long	h[RPC_HEADER_WORDS];
    192 		struct repl d;
    193 	} rdata;
    194 	ssize_t cc;
    195 
    196 #ifdef NFS_DEBUG
    197 	if (debug)
    198 		printf("lookupfh: called\n");
    199 #endif
    200 
    201 	args = &sdata.d;
    202 	repl = &rdata.d;
    203 
    204 	bzero(args, sizeof(*args));
    205 	bcopy(d->fh, args->fh, sizeof(args->fh));
    206 	len = strlen(name);
    207 	if (len > sizeof(args->name))
    208 		len = sizeof(args->name);
    209 	bcopy(name, args->name, len);
    210 	args->len = htonl(len);
    211 	len = 4 + roundup(len, 4);
    212 	len += NFS_FHSIZE;
    213 
    214 	rlen = sizeof(*repl);
    215 
    216 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_LOOKUP,
    217 	    args, len, repl, rlen);
    218 	if (cc == -1)
    219 		return (errno);		/* XXX - from rpc_call */
    220 	if (cc < 4)
    221 		return (EIO);
    222 	if (repl->errno) {
    223 		/* saerrno.h now matches NFS error numbers. */
    224 		return (ntohl(repl->errno));
    225 	}
    226 	bcopy( repl->fh, &newfd->fh, sizeof(newfd->fh));
    227 	bcopy(&repl->fa, &newfd->fa, sizeof(newfd->fa));
    228 	return (0);
    229 }
    230 
    231 #ifndef NFS_NOSYMLINK
    232 /*
    233  * Get the destination of a symbolic link.
    234  */
    235 int
    236 nfs_readlink(d, buf)
    237 	struct nfs_iodesc *d;
    238 	char *buf;
    239 {
    240 	struct {
    241 		n_long	h[RPC_HEADER_WORDS];
    242 		u_char fh[NFS_FHSIZE];
    243 	} sdata;
    244 	struct {
    245 		n_long	h[RPC_HEADER_WORDS];
    246 		struct nfs_readlnk_repl d;
    247 	} rdata;
    248 	ssize_t cc;
    249 
    250 #ifdef NFS_DEBUG
    251 	if (debug)
    252 		printf("readlink: called\n");
    253 #endif
    254 
    255 	bcopy(d->fh, sdata.fh, NFS_FHSIZE);
    256 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READLINK,
    257 		      sdata.fh, NFS_FHSIZE,
    258 		      &rdata.d, sizeof(rdata.d));
    259 	if (cc == -1)
    260 		return (errno);
    261 
    262 	if (cc < 4)
    263 		return (EIO);
    264 
    265 	if (rdata.d.errno)
    266 		return (ntohl(rdata.d.errno));
    267 
    268 	rdata.d.len = ntohl(rdata.d.len);
    269 	if (rdata.d.len > NFS_MAXPATHLEN)
    270 		return (ENAMETOOLONG);
    271 
    272 	bcopy(rdata.d.path, buf, rdata.d.len);
    273 	buf[rdata.d.len] = 0;
    274 	return (0);
    275 }
    276 #endif
    277 
    278 /*
    279  * Read data from a file.
    280  * Return transfer count or -1 (and set errno)
    281  */
    282 ssize_t
    283 nfs_readdata(d, off, addr, len)
    284 	struct nfs_iodesc *d;
    285 	off_t off;
    286 	void *addr;
    287 	size_t len;
    288 {
    289 	struct nfs_read_args *args;
    290 	struct nfs_read_repl *repl;
    291 	struct {
    292 		n_long	h[RPC_HEADER_WORDS];
    293 		struct nfs_read_args d;
    294 	} sdata;
    295 	struct {
    296 		n_long	h[RPC_HEADER_WORDS];
    297 		struct nfs_read_repl d;
    298 	} rdata;
    299 	size_t cc;
    300 	long x;
    301 	int hlen, rlen;
    302 
    303 	args = &sdata.d;
    304 	repl = &rdata.d;
    305 
    306 	bcopy(d->fh, args->fh, NFS_FHSIZE);
    307 	args->off = htonl((n_long)off);
    308 	if (len > NFSREAD_SIZE)
    309 		len = NFSREAD_SIZE;
    310 	args->len = htonl((n_long)len);
    311 	args->xxx = htonl((n_long)0);
    312 	hlen = sizeof(*repl) - NFSREAD_SIZE;
    313 
    314 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READ,
    315 	    args, sizeof(*args),
    316 	    repl, sizeof(*repl));
    317 	if (cc == -1) {
    318 		/* errno was already set by rpc_call */
    319 		return (-1);
    320 	}
    321 	if (cc < hlen) {
    322 		errno = EBADRPC;
    323 		return (-1);
    324 	}
    325 	if (repl->errno) {
    326 		errno = ntohl(repl->errno);
    327 		return (-1);
    328 	}
    329 	rlen = cc - hlen;
    330 	x = ntohl(repl->count);
    331 	if (rlen < x) {
    332 		printf("nfsread: short packet, %d < %ld\n", rlen, x);
    333 		errno = EBADRPC;
    334 		return(-1);
    335 	}
    336 	bcopy(repl->data, addr, x);
    337 	return (x);
    338 }
    339 
    340 /*
    341  * nfs_mount - mount this nfs filesystem to a host
    342  * On error, return non-zero and set errno.
    343  */
    344 int
    345 nfs_mount(sock, ip, path)
    346 	int sock;
    347 	struct in_addr ip;
    348 	char *path;
    349 {
    350 	struct iodesc *desc;
    351 	struct nfsv2_fattrs *fa;
    352 
    353 	if (!(desc = socktodesc(sock))) {
    354 		errno = EINVAL;
    355 		return(-1);
    356 	}
    357 
    358 	/* Bind to a reserved port. */
    359 	desc->myport = htons(--rpc_port);
    360 	desc->destip = ip;
    361 	if (nfs_getrootfh(desc, path, nfs_root_node.fh))
    362 		return (-1);
    363 	nfs_root_node.iodesc = desc;
    364 	/* Fake up attributes for the root dir. */
    365 	fa = &nfs_root_node.fa;
    366 	fa->fa_type  = htonl(NFDIR);
    367 	fa->fa_mode  = htonl(0755);
    368 	fa->fa_nlink = htonl(2);
    369 
    370 #ifdef NFS_DEBUG
    371 	if (debug)
    372 		printf("nfs_mount: got fh for %s\n", path);
    373 #endif
    374 
    375 	return(0);
    376 }
    377 
    378 /*
    379  * Open a file.
    380  * return zero or error number
    381  */
    382 int
    383 nfs_open(path, f)
    384 	char *path;
    385 	struct open_file *f;
    386 {
    387 	struct nfs_iodesc *newfd, *currfd;
    388 #ifndef NFS_NOSYMLINK
    389 	register char *cp, *ncp;
    390 	register int c;
    391 	char namebuf[NFS_MAXPATHLEN + 1];
    392 	char linkbuf[NFS_MAXPATHLEN + 1];
    393 	int nlinks = 0;
    394 #endif
    395 	int error = 0;
    396 
    397 #ifdef NFS_DEBUG
    398  	if (debug)
    399  	    printf("nfs_open: %s\n", path);
    400 #endif
    401 	if (nfs_root_node.iodesc == NULL) {
    402 		printf("nfs_open: must mount first.\n");
    403 		return (ENXIO);
    404 	}
    405 
    406 	currfd = &nfs_root_node;
    407 	newfd = 0;
    408 
    409 #ifndef NFS_NOSYMLINK
    410 	cp = path;
    411 	while (*cp) {
    412 		/*
    413 		 * Remove extra separators
    414 		 */
    415 		while (*cp == '/')
    416 			cp++;
    417 
    418 		if (*cp == '\0')
    419 			break;
    420 		/*
    421 		 * Check that current node is a directory.
    422 		 */
    423 		if (currfd->fa.fa_type != htonl(NFDIR)) {
    424 			error = ENOTDIR;
    425 			goto out;
    426 		}
    427 
    428 		/* allocate file system specific data structure */
    429 		newfd = alloc(sizeof(*newfd));
    430 		newfd->iodesc = currfd->iodesc;
    431 		newfd->off = 0;
    432 
    433 		/*
    434 		 * Get next component of path name.
    435 		 */
    436 		{
    437 			register int len = 0;
    438 
    439 			ncp = cp;
    440 			while ((c = *cp) != '\0' && c != '/') {
    441 				if (++len > NFS_MAXNAMLEN) {
    442 					error = ENOENT;
    443 					goto out;
    444 				}
    445 				cp++;
    446 			}
    447 			*cp = '\0';
    448 		}
    449 
    450 		/* lookup a file handle */
    451 		error = nfs_lookupfh(currfd, ncp, newfd);
    452 		*cp = c;
    453 		if (error)
    454 			goto out;
    455 
    456 		/*
    457 		 * Check for symbolic link
    458 		 */
    459 		if (newfd->fa.fa_type == htonl(NFLNK)) {
    460 			int link_len, len;
    461 
    462 			error = nfs_readlink(newfd, linkbuf);
    463 			if (error)
    464 				goto out;
    465 
    466 			link_len = strlen(linkbuf);
    467 			len = strlen(cp);
    468 
    469 			if (link_len + len > MAXPATHLEN
    470 			    || ++nlinks > MAXSYMLINKS) {
    471 				error = ENOENT;
    472 				goto out;
    473 			}
    474 
    475 			bcopy(cp, &namebuf[link_len], len + 1);
    476 			bcopy(linkbuf, namebuf, link_len);
    477 
    478 			/*
    479 			 * If absolute pathname, restart at root.
    480 			 * If relative pathname, restart at parent directory.
    481 			 */
    482 			cp = namebuf;
    483 			if (*cp == '/') {
    484 				if (currfd != &nfs_root_node)
    485 					free(currfd, sizeof(*currfd));
    486 				currfd = &nfs_root_node;
    487 			}
    488 
    489 			free(newfd, sizeof(*newfd));
    490 			newfd = 0;
    491 
    492 			continue;
    493 		}
    494 
    495 		if (currfd != &nfs_root_node)
    496 			free(currfd, sizeof(*currfd));
    497 		currfd = newfd;
    498 		newfd = 0;
    499 	}
    500 
    501 	error = 0;
    502 
    503 out:
    504 #else
    505         /* allocate file system specific data structure */
    506         currfd = alloc(sizeof(*currfd));
    507         currfd->iodesc = nfs_root_node.iodesc;
    508         currfd->off = 0;
    509 
    510         error = nfs_lookupfh(&nfs_root_node, path, currfd);
    511 #endif
    512 	if (!error) {
    513 		f->f_fsdata = (void *)currfd;
    514 		return (0);
    515 	}
    516 
    517 #ifdef NFS_DEBUG
    518 	if (debug)
    519 		printf("nfs_open: %s lookupfh failed: %s\n",
    520 		    path, strerror(error));
    521 #endif
    522 	if (currfd != &nfs_root_node)
    523 		free(currfd, sizeof(*currfd));
    524 	if (newfd)
    525 		free(newfd, sizeof(*newfd));
    526 
    527 	return (error);
    528 }
    529 
    530 int
    531 nfs_close(f)
    532 	struct open_file *f;
    533 {
    534 	register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    535 
    536 #ifdef NFS_DEBUG
    537 	if (debug)
    538 		printf("nfs_close: fp=0x%x\n", fp);
    539 #endif
    540 
    541 	if (fp)
    542 		free(fp, sizeof(struct nfs_iodesc));
    543 	f->f_fsdata = (void *)0;
    544 
    545 	return (0);
    546 }
    547 
    548 /*
    549  * read a portion of a file
    550  */
    551 int
    552 nfs_read(f, buf, size, resid)
    553 	struct open_file *f;
    554 	void *buf;
    555 	size_t size;
    556 	size_t *resid;	/* out */
    557 {
    558 	register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    559 	register ssize_t cc;
    560 	register char *addr = buf;
    561 
    562 #ifdef NFS_DEBUG
    563 	if (debug)
    564 		printf("nfs_read: size=%d off=%d\n", size, (int)fp->off);
    565 #endif
    566 	while ((int)size > 0) {
    567 		twiddle();
    568 		cc = nfs_readdata(fp, fp->off, (void *)addr, size);
    569 		/* XXX maybe should retry on certain errors */
    570 		if (cc == -1) {
    571 #ifdef NFS_DEBUG
    572 			if (debug)
    573 				printf("nfs_read: read: %s", strerror(errno));
    574 #endif
    575 			return (errno);	/* XXX - from nfs_readdata */
    576 		}
    577 		if (cc == 0) {
    578 #ifdef NFS_DEBUG
    579 			if (debug)
    580 				printf("nfs_read: hit EOF unexpectantly");
    581 #endif
    582 			goto ret;
    583 		}
    584 		fp->off += cc;
    585 		addr += cc;
    586 		size -= cc;
    587 	}
    588 ret:
    589 	if (resid)
    590 		*resid = size;
    591 
    592 	return (0);
    593 }
    594 
    595 /*
    596  * Not implemented.
    597  */
    598 int
    599 nfs_write(f, buf, size, resid)
    600 	struct open_file *f;
    601 	void *buf;
    602 	size_t size;
    603 	size_t *resid;	/* out */
    604 {
    605 	return (EROFS);
    606 }
    607 
    608 off_t
    609 nfs_seek(f, offset, where)
    610 	struct open_file *f;
    611 	off_t offset;
    612 	int where;
    613 {
    614 	register struct nfs_iodesc *d = (struct nfs_iodesc *)f->f_fsdata;
    615 	n_long size = ntohl(d->fa.fa_size);
    616 
    617 	switch (where) {
    618 	case SEEK_SET:
    619 		d->off = offset;
    620 		break;
    621 	case SEEK_CUR:
    622 		d->off += offset;
    623 		break;
    624 	case SEEK_END:
    625 		d->off = size - offset;
    626 		break;
    627 	default:
    628 		return (-1);
    629 	}
    630 
    631 	return (d->off);
    632 }
    633 
    634 /* NFNON=0, NFREG=1, NFDIR=2, NFBLK=3, NFCHR=4, NFLNK=5 */
    635 int nfs_stat_types[8] = {
    636 	0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 0 };
    637 
    638 int
    639 nfs_stat(f, sb)
    640 	struct open_file *f;
    641 	struct stat *sb;
    642 {
    643 	struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    644 	register n_long ftype, mode;
    645 
    646 	ftype = ntohl(fp->fa.fa_type);
    647 	mode  = ntohl(fp->fa.fa_mode);
    648 	mode |= nfs_stat_types[ftype & 7];
    649 
    650 	sb->st_mode  = mode;
    651 	sb->st_nlink = ntohl(fp->fa.fa_nlink);
    652 	sb->st_uid   = ntohl(fp->fa.fa_uid);
    653 	sb->st_gid   = ntohl(fp->fa.fa_gid);
    654 	sb->st_size  = ntohl(fp->fa.fa_size);
    655 
    656 	return (0);
    657 }
    658