Home | History | Annotate | Line # | Download | only in libsa
nfs.c revision 1.16 
      1 /*	$NetBSD: nfs.c,v 1.16 1996/09/30 16:01:20 ws 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_readlnk_repl {
     85 	n_long	errno;
     86 	n_long	len;
     87 	char	path[NFS_MAXPATHLEN];
     88 };
     89 
     90 struct nfs_iodesc {
     91 	struct	iodesc	*iodesc;
     92 	off_t	off;
     93 	u_char	fh[NFS_FHSIZE];
     94 	struct nfsv2_fattrs fa;	/* all in network order */
     95 };
     96 
     97 struct nfs_iodesc nfs_root_node;
     98 
     99 
    100 /*
    101  * Fetch the root file handle (call mount daemon)
    102  * On error, return non-zero and set errno.
    103  */
    104 int
    105 nfs_getrootfh(d, path, fhp)
    106 	register struct iodesc *d;
    107 	char *path;
    108 	u_char *fhp;
    109 {
    110 	register int len;
    111 	struct args {
    112 		n_long	len;
    113 		char	path[FNAME_SIZE];
    114 	} *args;
    115 	struct repl {
    116 		n_long	errno;
    117 		u_char	fh[NFS_FHSIZE];
    118 	} *repl;
    119 	struct {
    120 		n_long	h[RPC_HEADER_WORDS];
    121 		struct args d;
    122 	} sdata;
    123 	struct {
    124 		n_long	h[RPC_HEADER_WORDS];
    125 		struct repl d;
    126 	} rdata;
    127 	size_t cc;
    128 
    129 #ifdef NFS_DEBUG
    130 	if (debug)
    131 		printf("nfs_getrootfh: %s\n", path);
    132 #endif
    133 
    134 	args = &sdata.d;
    135 	repl = &rdata.d;
    136 
    137 	bzero(args, sizeof(*args));
    138 	len = strlen(path);
    139 	if (len > sizeof(args->path))
    140 		len = sizeof(args->path);
    141 	args->len = htonl(len);
    142 	bcopy(path, args->path, len);
    143 	len = 4 + roundup(len, 4);
    144 
    145 	cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT,
    146 	    args, len, repl, sizeof(*repl));
    147 	if (cc == -1) {
    148 		/* errno was set by rpc_call */
    149 		return (-1);
    150 	}
    151 	if (cc < 4) {
    152 		errno = EBADRPC;
    153 		return (-1);
    154 	}
    155 	if (repl->errno) {
    156 		errno = ntohl(repl->errno);
    157 		return (-1);
    158 	}
    159 	bcopy(repl->fh, fhp, sizeof(repl->fh));
    160 	return (0);
    161 }
    162 
    163 /*
    164  * Lookup a file.  Store handle and attributes.
    165  * Return zero or error number.
    166  */
    167 int
    168 nfs_lookupfh(d, name, newfd)
    169 	struct nfs_iodesc *d;
    170 	char *name;
    171 	struct nfs_iodesc *newfd;
    172 {
    173 	register int len, rlen;
    174 	struct args {
    175 		u_char	fh[NFS_FHSIZE];
    176 		n_long	len;
    177 		char	name[FNAME_SIZE];
    178 	} *args;
    179 	struct repl {
    180 		n_long	errno;
    181 		u_char	fh[NFS_FHSIZE];
    182 		struct	nfsv2_fattrs fa;
    183 	} *repl;
    184 	struct {
    185 		n_long	h[RPC_HEADER_WORDS];
    186 		struct args d;
    187 	} sdata;
    188 	struct {
    189 		n_long	h[RPC_HEADER_WORDS];
    190 		struct repl d;
    191 	} rdata;
    192 	ssize_t cc;
    193 
    194 #ifdef NFS_DEBUG
    195 	if (debug)
    196 		printf("lookupfh: called\n");
    197 #endif
    198 
    199 	args = &sdata.d;
    200 	repl = &rdata.d;
    201 
    202 	bzero(args, sizeof(*args));
    203 	bcopy(d->fh, args->fh, sizeof(args->fh));
    204 	len = strlen(name);
    205 	if (len > sizeof(args->name))
    206 		len = sizeof(args->name);
    207 	bcopy(name, args->name, len);
    208 	args->len = htonl(len);
    209 	len = 4 + roundup(len, 4);
    210 	len += NFS_FHSIZE;
    211 
    212 	rlen = sizeof(*repl);
    213 
    214 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_LOOKUP,
    215 	    args, len, repl, rlen);
    216 	if (cc == -1)
    217 		return (errno);		/* XXX - from rpc_call */
    218 	if (cc < 4)
    219 		return (EIO);
    220 	if (repl->errno) {
    221 		/* saerrno.h now matches NFS error numbers. */
    222 		return (ntohl(repl->errno));
    223 	}
    224 	bcopy( repl->fh, &newfd->fh, sizeof(newfd->fh));
    225 	bcopy(&repl->fa, &newfd->fa, sizeof(newfd->fa));
    226 	return (0);
    227 }
    228 
    229 /*
    230  * Get the destination of a symbolic link.
    231  */
    232 int
    233 nfs_readlink(d, buf)
    234 	struct nfs_iodesc *d;
    235 	char *buf;
    236 {
    237 	struct {
    238 		n_long	h[RPC_HEADER_WORDS];
    239 		u_char fh[NFS_FHSIZE];
    240 	} sdata;
    241 	struct {
    242 		n_long	h[RPC_HEADER_WORDS];
    243 		struct nfs_readlnk_repl d;
    244 	} rdata;
    245 	ssize_t cc;
    246 
    247 #ifdef NFS_DEBUG
    248 	if (debug)
    249 		printf("readlink: called\n");
    250 #endif
    251 
    252 	bcopy(d->fh, sdata.fh, NFS_FHSIZE);
    253 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READLINK,
    254 		      sdata.fh, NFS_FHSIZE,
    255 		      &rdata.d, sizeof(rdata.d));
    256 	if (cc == -1)
    257 		return (errno);
    258 
    259 	if (cc < 4)
    260 		return (EIO);
    261 
    262 	if (rdata.d.errno)
    263 		return (ntohl(rdata.d.errno));
    264 
    265 	if (rdata.d.len > NFS_MAXPATHLEN)
    266 		return (ENAMETOOLONG);
    267 
    268 	bcopy(rdata.d.path, buf, rdata.d.len);
    269 	buf[rdata.d.len] = 0;
    270 	return (0);
    271 }
    272 
    273 /*
    274  * Read data from a file.
    275  * Return transfer count or -1 (and set errno)
    276  */
    277 ssize_t
    278 nfs_readdata(d, off, addr, len)
    279 	struct nfs_iodesc *d;
    280 	off_t off;
    281 	void *addr;
    282 	size_t len;
    283 {
    284 	struct nfs_read_args *args;
    285 	struct nfs_read_repl *repl;
    286 	struct {
    287 		n_long	h[RPC_HEADER_WORDS];
    288 		struct nfs_read_args d;
    289 	} sdata;
    290 	struct {
    291 		n_long	h[RPC_HEADER_WORDS];
    292 		struct nfs_read_repl d;
    293 	} rdata;
    294 	size_t cc;
    295 	long x;
    296 	int hlen, rlen;
    297 
    298 	args = &sdata.d;
    299 	repl = &rdata.d;
    300 
    301 	bcopy(d->fh, args->fh, NFS_FHSIZE);
    302 	args->off = htonl((n_long)off);
    303 	if (len > NFSREAD_SIZE)
    304 		len = NFSREAD_SIZE;
    305 	args->len = htonl((n_long)len);
    306 	args->xxx = htonl((n_long)0);
    307 	hlen = sizeof(*repl) - NFSREAD_SIZE;
    308 
    309 	cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READ,
    310 	    args, sizeof(*args),
    311 	    repl, sizeof(*repl));
    312 	if (cc == -1) {
    313 		/* errno was already set by rpc_call */
    314 		return (-1);
    315 	}
    316 	if (cc < hlen) {
    317 		errno = EBADRPC;
    318 		return (-1);
    319 	}
    320 	if (repl->errno) {
    321 		errno = ntohl(repl->errno);
    322 		return (-1);
    323 	}
    324 	rlen = cc - hlen;
    325 	x = ntohl(repl->count);
    326 	if (rlen < x) {
    327 		printf("nfsread: short packet, %d < %ld\n", rlen, x);
    328 		errno = EBADRPC;
    329 		return(-1);
    330 	}
    331 	bcopy(repl->data, addr, x);
    332 	return (x);
    333 }
    334 
    335 /*
    336  * nfs_mount - mount this nfs filesystem to a host
    337  * On error, return non-zero and set errno.
    338  */
    339 int
    340 nfs_mount(sock, ip, path)
    341 	int sock;
    342 	struct in_addr ip;
    343 	char *path;
    344 {
    345 	struct iodesc *desc;
    346 	struct nfsv2_fattrs *fa;
    347 
    348 	if (!(desc = socktodesc(sock))) {
    349 		errno = EINVAL;
    350 		return(-1);
    351 	}
    352 
    353 	/* Bind to a reserved port. */
    354 	desc->myport = htons(--rpc_port);
    355 	desc->destip = ip;
    356 	if (nfs_getrootfh(desc, path, nfs_root_node.fh))
    357 		return (-1);
    358 	nfs_root_node.iodesc = desc;
    359 	/* Fake up attributes for the root dir. */
    360 	fa = &nfs_root_node.fa;
    361 	fa->fa_type  = htonl(NFDIR);
    362 	fa->fa_mode  = htonl(0755);
    363 	fa->fa_nlink = htonl(2);
    364 
    365 #ifdef NFS_DEBUG
    366 	if (debug)
    367 		printf("nfs_mount: got fh for %s\n", path);
    368 #endif
    369 
    370 	return(0);
    371 }
    372 
    373 /*
    374  * Open a file.
    375  * return zero or error number
    376  */
    377 int
    378 nfs_open(path, f)
    379 	char *path;
    380 	struct open_file *f;
    381 {
    382 	struct nfs_iodesc *newfd, *currfd;
    383 	register char *cp, *ncp;
    384 	register int c;
    385 	char namebuf[NFS_MAXPATHLEN + 1];
    386 	char linkbuf[NFS_MAXPATHLEN + 1];
    387 	int nlinks = 0;
    388 	int error = 0;
    389 
    390 #ifdef NFS_DEBUG
    391  	if (debug)
    392  	    printf("nfs_open: %s\n", path);
    393 #endif
    394 	if (nfs_root_node.iodesc == NULL) {
    395 		printf("nfs_open: must mount first.\n");
    396 		return (ENXIO);
    397 	}
    398 
    399 	currfd = &nfs_root_node;
    400 	newfd = 0;
    401 
    402 	cp = path;
    403 	while (*cp) {
    404 		/*
    405 		 * Remove extra separators
    406 		 */
    407 		while (*cp == '/')
    408 			cp++;
    409 
    410 		if (*cp == '\0')
    411 			break;
    412 		/*
    413 		 * Check that current node is a directory.
    414 		 */
    415 		if (currfd->fa.fa_type != NFDIR) {
    416 			error = ENOTDIR;
    417 			goto out;
    418 		}
    419 
    420 		/* allocate file system specific data structure */
    421 		newfd = alloc(sizeof(*newfd));
    422 		newfd->iodesc = currfd->iodesc;
    423 		newfd->off = 0;
    424 
    425 		/*
    426 		 * Get next component of path name.
    427 		 */
    428 		{
    429 			register int len = 0;
    430 
    431 			ncp = cp;
    432 			while ((c = *cp) != '\0' && c != '/') {
    433 				if (++len > NFS_MAXNAMLEN) {
    434 					error = ENOENT;
    435 					goto out;
    436 				}
    437 				cp++;
    438 			}
    439 			*cp = '\0';
    440 		}
    441 
    442 		/* lookup a file handle */
    443 		error = nfs_lookupfh(currfd, ncp, newfd);
    444 		*cp = c;
    445 		if (error)
    446 			goto out;
    447 
    448 		/*
    449 		 * Check for symbolic link
    450 		 */
    451 		if (newfd->fa.fa_type == NFLNK) {
    452 			int link_len, len;
    453 
    454 			error = nfs_readlink(newfd, linkbuf);
    455 			if (error)
    456 				goto out;
    457 
    458 			link_len = strlen(linkbuf);
    459 			len = strlen(cp);
    460 
    461 			if (link_len + len > MAXPATHLEN
    462 			    || ++nlinks > MAXSYMLINKS) {
    463 				error = ENOENT;
    464 				goto out;
    465 			}
    466 
    467 			bcopy(cp, &namebuf[link_len], len + 1);
    468 			bcopy(linkbuf, namebuf, link_len);
    469 
    470 			/*
    471 			 * If absolute pathname, restart at root.
    472 			 * If relative pathname, restart at parent directory.
    473 			 */
    474 			cp = namebuf;
    475 			if (*cp == '/') {
    476 				if (currfd != &nfs_root_node)
    477 					free(currfd, sizeof(*currfd));
    478 				currfd = &nfs_root_node;
    479 			}
    480 
    481 			free(newfd, sizeof(*newfd));
    482 			newfd = 0;
    483 
    484 			continue;
    485 		}
    486 
    487 		if (currfd != &nfs_root_node)
    488 			free(currfd, sizeof(*currfd));
    489 		currfd = newfd;
    490 		newfd = 0;
    491 	}
    492 
    493 	error = 0;
    494 
    495 out:
    496 	if (!error) {
    497 		f->f_fsdata = (void *)currfd;
    498 		return (0);
    499 	}
    500 
    501 #ifdef NFS_DEBUG
    502 	if (debug)
    503 		printf("nfs_open: %s lookupfh failed: %s\n",
    504 			path, strerror(error));
    505 #endif
    506 	if (currfd != &nfs_root_node)
    507 		free(currfd, sizeof(*currfd));
    508 	if (newfd)
    509 		free(newfd, sizeof(*newfd));
    510 
    511 	return (error);
    512 }
    513 
    514 int
    515 nfs_close(f)
    516 	struct open_file *f;
    517 {
    518 	register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    519 
    520 #ifdef NFS_DEBUG
    521 	if (debug)
    522 		printf("nfs_close: fp=0x%x\n", fp);
    523 #endif
    524 
    525 	if (fp)
    526 		free(fp, sizeof(struct nfs_iodesc));
    527 	f->f_fsdata = (void *)0;
    528 
    529 	return (0);
    530 }
    531 
    532 /*
    533  * read a portion of a file
    534  */
    535 int
    536 nfs_read(f, buf, size, resid)
    537 	struct open_file *f;
    538 	void *buf;
    539 	size_t size;
    540 	size_t *resid;	/* out */
    541 {
    542 	register struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    543 	register ssize_t cc;
    544 	register char *addr = buf;
    545 
    546 #ifdef NFS_DEBUG
    547 	if (debug)
    548 		printf("nfs_read: size=%d off=%d\n", size, (int)fp->off);
    549 #endif
    550 	while ((int)size > 0) {
    551 		twiddle();
    552 		cc = nfs_readdata(fp, fp->off, (void *)addr, size);
    553 		/* XXX maybe should retry on certain errors */
    554 		if (cc == -1) {
    555 #ifdef NFS_DEBUG
    556 			if (debug)
    557 				printf("nfs_read: read: %s", strerror(errno));
    558 #endif
    559 			return (errno);	/* XXX - from nfs_readdata */
    560 		}
    561 		if (cc == 0) {
    562 			if (debug)
    563 				printf("nfs_read: hit EOF unexpectantly");
    564 			goto ret;
    565 		}
    566 		fp->off += cc;
    567 		addr += cc;
    568 		size -= cc;
    569 	}
    570 ret:
    571 	if (resid)
    572 		*resid = size;
    573 
    574 	return (0);
    575 }
    576 
    577 /*
    578  * Not implemented.
    579  */
    580 int
    581 nfs_write(f, buf, size, resid)
    582 	struct open_file *f;
    583 	void *buf;
    584 	size_t size;
    585 	size_t *resid;	/* out */
    586 {
    587 	return (EROFS);
    588 }
    589 
    590 off_t
    591 nfs_seek(f, offset, where)
    592 	struct open_file *f;
    593 	off_t offset;
    594 	int where;
    595 {
    596 	register struct nfs_iodesc *d = (struct nfs_iodesc *)f->f_fsdata;
    597 	n_long size = ntohl(d->fa.fa_size);
    598 
    599 	switch (where) {
    600 	case SEEK_SET:
    601 		d->off = offset;
    602 		break;
    603 	case SEEK_CUR:
    604 		d->off += offset;
    605 		break;
    606 	case SEEK_END:
    607 		d->off = size - offset;
    608 		break;
    609 	default:
    610 		return (-1);
    611 	}
    612 
    613 	return (d->off);
    614 }
    615 
    616 /* NFNON=0, NFREG=1, NFDIR=2, NFBLK=3, NFCHR=4, NFLNK=5 */
    617 int nfs_stat_types[8] = {
    618 	0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 0 };
    619 
    620 int
    621 nfs_stat(f, sb)
    622 	struct open_file *f;
    623 	struct stat *sb;
    624 {
    625 	struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
    626 	register n_long ftype, mode;
    627 
    628 	ftype = ntohl(fp->fa.fa_type);
    629 	mode  = ntohl(fp->fa.fa_mode);
    630 	mode |= nfs_stat_types[ftype & 7];
    631 
    632 	sb->st_mode  = mode;
    633 	sb->st_nlink = ntohl(fp->fa.fa_nlink);
    634 	sb->st_uid   = ntohl(fp->fa.fa_uid);
    635 	sb->st_gid   = ntohl(fp->fa.fa_gid);
    636 	sb->st_size  = ntohl(fp->fa.fa_size);
    637 
    638 	return (0);
    639 }
    640