1 /* $NetBSD: nfs.c,v 1.53 2024/06/29 07:49:36 rin 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 /*
32 * XXX Does not currently implement:
33 * XXX
34 * XXX LIBSA_NO_FS_CLOSE
35 * XXX LIBSA_NO_FS_SEEK
36 * XXX LIBSA_NO_FS_WRITE
37 * XXX LIBSA_NO_FS_SYMLINK (does this even make sense?)
38 * XXX LIBSA_FS_SINGLECOMPONENT (does this even make sense?)
39 */
40
41 #include <sys/param.h>
42 #include <sys/time.h>
43 #include <sys/socket.h>
44 #include <sys/stat.h>
45 #ifdef _STANDALONE
46 #include <lib/libkern/libkern.h>
47 #else
48 #include <string.h>
49 #endif
50
51 #include <netinet/in.h>
52 #include <netinet/in_systm.h>
53
54 #include "rpcv2.h"
55 #include "nfsv2.h"
56 #include "nfsv3.h"
57
58 #include "stand.h"
59 #include "net.h"
60 #include "nfs.h"
61 #include "rpc.h"
62
63 /* Storage for any filehandle (including length for V3) */
64 #define NFS_FHSTORE (NFS_FHSIZE < NFS_V3FHSIZE ? NFS_V3FHSIZE + 4: NFS_FHSIZE)
65
66 /* Data part of nfs rpc reply (also the largest thing we receive) */
67 #define NFSREAD_SIZE 1024
68
69 #ifndef NFS_NOSYMLINK
70 struct nfs_readlnk_repl {
71 n_long errno;
72 n_long len;
73 char path[NFS_MAXPATHLEN];
74 };
75 #endif
76
77 static inline uint64_t
getnquad(n_long x[2])78 getnquad(n_long x[2]) {
79 return (uint64_t)ntohl(x[0]) << 32 | ntohl(x[1]);
80 }
81
82 static inline void
setnquad(n_long x[2],uint64_t v)83 setnquad(n_long x[2], uint64_t v)
84 {
85 x[0] = htonl((n_long)(v >> 32));
86 x[1] = htonl((n_long)(v & 0xffffffff));
87 }
88
89 struct nfs_iodesc {
90 struct iodesc *iodesc;
91 off_t off;
92 int version;
93 u_char fh[NFS_FHSTORE];
94 union {
95 /* all in network order */
96 struct nfsv2_fattr v2;
97 struct nfsv3_fattr v3;
98 } u_fa;
99 };
100
101 static inline size_t
fhstore(int version,u_char * fh)102 fhstore(int version, u_char *fh)
103 {
104 size_t len;
105
106 switch (version) {
107 case NFS_VER2:
108 len = NFS_FHSIZE;
109 break;
110 case NFS_VER3:
111 len = fh[0] << 24 | fh[1] << 16 | fh[2] << 8 | fh[3];
112 if (len > NFS_V3FHSIZE)
113 len = NFS_V3FHSIZE;
114 len = 4 + roundup(len, 4);
115 break;
116 default:
117 len = 0;
118 break;
119 }
120
121 return len;
122 }
123
124 static inline size_t
fhcopy(int version,u_char * src,u_char * dst)125 fhcopy(int version, u_char *src, u_char *dst)
126 {
127 size_t len = fhstore(version, src);
128 memcpy(dst, src, len);
129 return len;
130 }
131
132 #define setfh(d, s) fhcopy((d)->version, (s), (d)->fh)
133 #define getfh(d, s) fhcopy((d)->version, (d)->fh, (s))
134
135
136 struct nfs_iodesc nfs_root_node;
137
138 int nfs_getrootfh(struct iodesc *, char *, u_char *, int *);
139 int nfs_lookupfh(struct nfs_iodesc *, const char *, int,
140 struct nfs_iodesc *);
141 int nfs_readlink(struct nfs_iodesc *, char *);
142 ssize_t nfs_readdata(struct nfs_iodesc *, off_t, void *, size_t);
143
144 /*
145 * Fetch the root file handle (call mount daemon)
146 * On error, return non-zero and set errno.
147 */
148 int
nfs_getrootfh(struct iodesc * d,char * path,u_char * fhp,int * versionp)149 nfs_getrootfh(struct iodesc *d, char *path, u_char *fhp, int *versionp)
150 {
151 int len;
152 struct args {
153 n_long len;
154 char path[FNAME_SIZE];
155 } *args;
156 struct repl {
157 n_long errno;
158 u_char fh[NFS_FHSTORE];
159 } *repl;
160 struct {
161 n_long h[RPC_HEADER_WORDS];
162 struct args d;
163 } sdata;
164 struct {
165 n_long h[RPC_HEADER_WORDS];
166 struct repl d;
167 } rdata;
168 ssize_t cc;
169
170 #ifdef NFS_DEBUG
171 if (debug)
172 printf("%s: %s\n", __func__, path);
173 #endif
174
175 args = &sdata.d;
176 repl = &rdata.d;
177
178 (void)memset(args, 0, sizeof(*args));
179 len = strlen(path);
180 if ((size_t)len > sizeof(args->path))
181 len = sizeof(args->path);
182 args->len = htonl(len);
183 (void)memcpy(args->path, path, len);
184 len = 4 + roundup(len, 4);
185
186 *versionp = NFS_VER3;
187 cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER3, RPCMNT_MOUNT,
188 args, len, repl, sizeof(*repl));
189 if (cc == -1 || cc < 4 || repl->errno) {
190 *versionp = NFS_VER2;
191 cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT,
192 args, len, repl, sizeof(*repl));
193 }
194 if (cc == -1) {
195 /* errno was set by rpc_call */
196 return -1;
197 }
198 if (cc < 4) {
199 errno = EBADRPC;
200 return -1;
201 }
202 if (repl->errno) {
203 errno = ntohl(repl->errno);
204 return -1;
205 }
206 fhcopy(*versionp, repl->fh, fhp);
207 return 0;
208 }
209
210 /*
211 * Lookup a file. Store handle and attributes.
212 * Return zero or error number.
213 */
214 int
nfs_lookupfh(struct nfs_iodesc * d,const char * name,int len,struct nfs_iodesc * newfd)215 nfs_lookupfh(struct nfs_iodesc *d, const char *name, int len,
216 struct nfs_iodesc *newfd)
217 {
218 struct argsv2 {
219 u_char fh[NFS_FHSIZE];
220 n_long len;
221 char name[FNAME_SIZE];
222 } *argsv2;
223 struct argsv3 {
224 u_char fh[NFS_FHSTORE];
225 n_long len;
226 char name[FNAME_SIZE];
227 } *argsv3;
228 struct replv2 {
229 n_long errno;
230 u_char fh[NFS_FHSIZE];
231 struct nfsv2_fattr fa;
232 } *replv2;
233 struct replv3 {
234 n_long errno;
235 u_char fh[NFS_FHSTORE];
236 n_long fattrflag;
237 struct nfsv3_fattr fa;
238 n_long dattrflag;
239 struct nfsv3_fattr da;
240 } *replv3;
241 struct {
242 n_long h[RPC_HEADER_WORDS];
243 union {
244 struct argsv2 v2;
245 struct argsv3 v3;
246 } u_d;
247 } sdata;
248 struct {
249 n_long h[RPC_HEADER_WORDS];
250 union {
251 struct replv2 v2;
252 struct replv3 v3;
253 } u_d;
254 } rdata;
255 ssize_t cc;
256 size_t alen;
257
258 #ifdef NFS_DEBUG
259 if (debug)
260 printf("%s: called\n", __func__);
261 #endif
262
263 argsv2 = &sdata.u_d.v2;
264 argsv3 = &sdata.u_d.v3;
265 replv2 = &rdata.u_d.v2;
266 replv3 = &rdata.u_d.v3;
267
268 switch (d->version) {
269 case NFS_VER2:
270 (void)memset(argsv2, 0, sizeof(*argsv2));
271 getfh(d, argsv2->fh);
272 if ((size_t)len > sizeof(argsv2->name))
273 len = sizeof(argsv2->name);
274 (void)memcpy(argsv2->name, name, len);
275 argsv2->len = htonl(len);
276
277 /* padded name, name length */
278 len = roundup(len, 4) + 4;
279 /* filehandle size */
280 alen = fhstore(d->version, argsv2->fh);
281
282 cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_LOOKUP,
283 argsv2, alen+len, replv2, sizeof(*replv2));
284 break;
285 case NFS_VER3:
286 (void)memset(argsv3, 0, sizeof(*argsv3));
287 getfh(d, argsv3->fh);
288 if ((size_t)len > sizeof(argsv3->name))
289 len = sizeof(argsv3->name);
290 (void)memcpy(argsv3->name, name, len);
291 argsv3->len = htonl(len);
292
293 /* padded name, name length */
294 len = roundup(len, 4) + 4;
295 /* filehandle size */
296 alen = fhstore(d->version, argsv3->fh);
297
298 /* adjust for variable sized file handle */
299 memmove(argsv3->fh + alen, &argsv3->len, len);
300
301 cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER3, NFSV3PROC_LOOKUP,
302 argsv3, alen+len, replv3, sizeof(*replv3));
303 break;
304 default:
305 return ENOSYS;
306 }
307
308 if (cc == -1)
309 return errno; /* XXX - from rpc_call */
310 if (cc < 4)
311 return EIO;
312
313 switch (d->version) {
314 case NFS_VER2:
315 if (replv2->errno) {
316 /* saerrno.h now matches NFS error numbers. */
317 return ntohl(replv2->errno);
318 }
319
320 setfh(newfd, replv2->fh);
321 (void)memcpy(&newfd->u_fa.v2, &replv2->fa,
322 sizeof(newfd->u_fa.v2));
323 break;
324 case NFS_VER3:
325 if (replv3->errno) {
326 /* saerrno.h now matches NFS error numbers. */
327 return ntohl(replv3->errno);
328 }
329
330 setfh(newfd, replv3->fh);
331
332 if (replv3->fattrflag) {
333 (void)memcpy(&newfd->u_fa.v3, &replv3->fa,
334 sizeof(newfd->u_fa.v3));
335 }
336 break;
337 }
338 return 0;
339 }
340
341 #ifndef NFS_NOSYMLINK
342 /*
343 * Get the destination of a symbolic link.
344 */
345 int
nfs_readlink(struct nfs_iodesc * d,char * buf)346 nfs_readlink(struct nfs_iodesc *d, char *buf)
347 {
348 struct {
349 n_long h[RPC_HEADER_WORDS];
350 u_char fh[NFS_FHSTORE];
351 } sdata;
352 struct {
353 n_long h[RPC_HEADER_WORDS];
354 struct nfs_readlnk_repl d;
355 } rdata;
356 ssize_t cc;
357
358 #ifdef NFS_DEBUG
359 if (debug)
360 printf("%s: called\n", __func__);
361 #endif
362
363 getfh(d, sdata.fh);
364 cc = rpc_call(d->iodesc, NFS_PROG, d->version, NFSPROC_READLINK,
365 sdata.fh, fhstore(d->version, sdata.fh),
366 &rdata.d, sizeof(rdata.d));
367 if (cc == -1)
368 return errno;
369
370 if (cc < 4)
371 return EIO;
372
373 if (rdata.d.errno)
374 return ntohl(rdata.d.errno);
375
376 rdata.d.len = ntohl(rdata.d.len);
377 if (rdata.d.len > NFS_MAXPATHLEN)
378 return ENAMETOOLONG;
379
380 (void)memcpy(buf, rdata.d.path, rdata.d.len);
381 buf[rdata.d.len] = 0;
382 return 0;
383 }
384 #endif
385
386 /*
387 * Read data from a file.
388 * Return transfer count or -1 (and set errno)
389 */
390 ssize_t
nfs_readdata(struct nfs_iodesc * d,off_t off,void * addr,size_t len)391 nfs_readdata(struct nfs_iodesc *d, off_t off, void *addr, size_t len)
392 {
393 struct argsv2 {
394 u_char fh[NFS_FHSIZE];
395 n_long off;
396 n_long len;
397 n_long xxx; /* XXX what's this for? */
398 } *argsv2;
399 struct argsv3 {
400 u_char fh[NFS_FHSTORE];
401 n_long off[2];
402 n_long len;
403 } *argsv3;
404 struct replv2 {
405 n_long errno;
406 struct nfsv2_fattr fa;
407 n_long count;
408 u_char data[NFSREAD_SIZE];
409 } *replv2;
410 struct replv3 {
411 n_long errno;
412 n_long attrflag;
413 struct nfsv3_fattr fa;
414 n_long count;
415 n_long eof;
416 n_long length;
417 u_char data[NFSREAD_SIZE];
418 } *replv3;
419 struct replv3_noattr {
420 n_long errno;
421 n_long attrflag;
422 n_long count;
423 n_long eof;
424 n_long length;
425 u_char data[NFSREAD_SIZE];
426 } *replv3no;
427 struct {
428 n_long h[RPC_HEADER_WORDS];
429 union {
430 struct argsv2 v2;
431 struct argsv3 v3;
432 } u_d;
433 } sdata;
434 struct {
435 n_long h[RPC_HEADER_WORDS];
436 union {
437 struct replv2 v2;
438 struct replv3 v3;
439 } u_d;
440 } rdata;
441 ssize_t cc;
442 long x;
443 size_t hlen, rlen, alen;
444 u_char *data;
445
446 argsv2 = &sdata.u_d.v2;
447 argsv3 = &sdata.u_d.v3;
448 replv2 = &rdata.u_d.v2;
449 replv3 = &rdata.u_d.v3;
450
451 if (len > NFSREAD_SIZE)
452 len = NFSREAD_SIZE;
453
454 switch (d->version) {
455 case NFS_VER2:
456 getfh(d, argsv2->fh);
457 argsv2->off = htonl((n_long)off);
458 argsv2->len = htonl((n_long)len);
459 argsv2->xxx = htonl((n_long)0);
460 hlen = sizeof(*replv2) - NFSREAD_SIZE;
461 cc = rpc_call(d->iodesc, NFS_PROG, d->version, NFSPROC_READ,
462 argsv2, sizeof(*argsv2),
463 replv2, sizeof(*replv2));
464 break;
465 case NFS_VER3:
466 getfh(d, argsv3->fh);
467 setnquad(argsv3->off, (uint64_t)off);
468 argsv3->len = htonl((n_long)len);
469 hlen = sizeof(*replv3) - NFSREAD_SIZE;
470
471 /* adjust for variable sized file handle */
472 alen = sizeof(*argsv3) - offsetof(struct argsv3, off);
473 memmove(argsv3->fh + fhstore(d->version, argsv3->fh),
474 &argsv3->off, alen);
475 alen += fhstore(d->version, argsv3->fh);
476
477 cc = rpc_call(d->iodesc, NFS_PROG, d->version, NFSPROC_READ,
478 argsv3, alen,
479 replv3, sizeof(*replv3));
480 break;
481 default:
482 errno = ENOSYS;
483 return -1;
484 }
485
486 if (cc == -1) {
487 /* errno was already set by rpc_call */
488 return -1;
489 }
490 if (cc < (ssize_t)hlen) {
491 errno = EBADRPC;
492 return -1;
493 }
494
495 switch (d->version) {
496 case NFS_VER2:
497 if (replv2->errno) {
498 errno = ntohl(replv2->errno);
499 return -1;
500 }
501 x = ntohl(replv2->count);
502 data = replv2->data;
503 break;
504 case NFS_VER3:
505 if (replv3->errno) {
506 errno = ntohl(replv3->errno);
507 return -1;
508 }
509
510 /* adjust for optional attributes */
511 if (replv3->attrflag) {
512 x = ntohl(replv3->length);
513 data = replv3->data;
514 } else {
515 replv3no = (struct replv3_noattr *)replv3;
516 x = ntohl(replv3no->length);
517 data = replv3no->data;
518 }
519 break;
520 default:
521 errno = ENOSYS;
522 return -1;
523 }
524
525 rlen = cc - hlen;
526 if (rlen < (size_t)x) {
527 printf("%s: short packet, %zu < %ld\n", __func__, rlen, x);
528 errno = EBADRPC;
529 return -1;
530 }
531 (void)memcpy(addr, data, x);
532 return x;
533 }
534
535 /*
536 * nfs_mount - mount this nfs filesystem to a host
537 * On error, return non-zero and set errno.
538 */
539 int
nfs_mount(int sock,struct in_addr ip,char * path)540 nfs_mount(int sock, struct in_addr ip, char *path)
541 {
542 struct iodesc *desc;
543 struct nfsv2_fattr *fa2;
544 struct nfsv3_fattr *fa3;
545
546 if (!(desc = socktodesc(sock))) {
547 errno = EINVAL;
548 return -1;
549 }
550
551 /* Bind to a reserved port. */
552 desc->myport = htons(--rpc_port);
553 desc->destip = ip;
554 if (nfs_getrootfh(desc, path, nfs_root_node.fh, &nfs_root_node.version))
555 return -1;
556 nfs_root_node.iodesc = desc;
557 /* Fake up attributes for the root dir. */
558 switch (nfs_root_node.version) {
559 case NFS_VER2:
560 fa2 = &nfs_root_node.u_fa.v2;
561 fa2->fa_type = htonl(NFDIR);
562 fa2->fa_mode = htonl(0755);
563 fa2->fa_nlink = htonl(2);
564 break;
565 case NFS_VER3:
566 fa3 = &nfs_root_node.u_fa.v3;
567 fa3->fa_type = htonl(NFDIR);
568 fa3->fa_mode = htonl(0755);
569 fa3->fa_nlink = htonl(2);
570 break;
571 default:
572 errno = ENOSYS;
573 return -1;
574 }
575
576 #ifdef NFS_DEBUG
577 if (debug)
578 printf("%s: got fh for %s\n", __func__, path);
579 #endif
580
581 return 0;
582 }
583
584 /*
585 * Open a file.
586 * return zero or error number
587 */
588 __compactcall int
nfs_open(const char * path,struct open_file * f)589 nfs_open(const char *path, struct open_file *f)
590 {
591 struct nfs_iodesc *newfd, *currfd;
592 const char *cp;
593 #ifndef NFS_NOSYMLINK
594 const char *ncp;
595 int c;
596 char namebuf[NFS_MAXPATHLEN + 1];
597 char linkbuf[NFS_MAXPATHLEN + 1];
598 int nlinks = 0;
599 n_long fa_type;
600 #endif
601 int error = 0;
602
603 #ifdef NFS_DEBUG
604 if (debug)
605 printf("%s: %s\n", __func__, path);
606 #endif
607
608 #ifdef LIBSA_NFS_IMPLICIT_MOUNT
609 if (nfs_mount(*((int *)(f->f_devdata)), rootip, rootpath))
610 return errno;
611 #endif
612
613 if (nfs_root_node.iodesc == NULL) {
614 printf("%s: must mount first.\n", __func__);
615 return ENXIO;
616 }
617
618 currfd = &nfs_root_node;
619 newfd = 0;
620
621 #ifndef NFS_NOSYMLINK
622 cp = path;
623 while (*cp) {
624 /*
625 * Remove extra separators
626 */
627 while (*cp == '/')
628 cp++;
629
630 if (*cp == '\0')
631 break;
632 /*
633 * Check that current node is a directory.
634 */
635 switch (currfd->version) {
636 case NFS_VER2:
637 fa_type = currfd->u_fa.v2.fa_type;
638 break;
639 case NFS_VER3:
640 fa_type = currfd->u_fa.v3.fa_type;
641 break;
642 default:
643 fa_type = htonl(NFNON);
644 break;
645 }
646 if (fa_type != htonl(NFDIR)) {
647 error = ENOTDIR;
648 goto out;
649 }
650
651 /* allocate file system specific data structure */
652 newfd = alloc(sizeof(*newfd));
653 newfd->iodesc = currfd->iodesc;
654 newfd->off = 0;
655 newfd->version = currfd->version;
656
657 /*
658 * Get next component of path name.
659 */
660 {
661 int len = 0;
662
663 ncp = cp;
664 while ((c = *cp) != '\0' && c != '/') {
665 if (++len > NFS_MAXNAMLEN) {
666 error = ENOENT;
667 goto out;
668 }
669 cp++;
670 }
671 }
672
673 /* lookup a file handle */
674 error = nfs_lookupfh(currfd, ncp, cp - ncp, newfd);
675 if (error)
676 goto out;
677
678 /*
679 * Check for symbolic link
680 */
681 switch (newfd->version) {
682 case NFS_VER2:
683 fa_type = newfd->u_fa.v2.fa_type;
684 break;
685 case NFS_VER3:
686 fa_type = newfd->u_fa.v3.fa_type;
687 break;
688 default:
689 fa_type = htonl(NFNON);
690 break;
691 }
692 if (fa_type == htonl(NFLNK)) {
693 int link_len, len;
694
695 error = nfs_readlink(newfd, linkbuf);
696 if (error)
697 goto out;
698
699 link_len = strlen(linkbuf);
700 len = strlen(cp);
701
702 if (link_len + len > MAXPATHLEN
703 || ++nlinks > MAXSYMLINKS) {
704 error = ENOENT;
705 goto out;
706 }
707
708 (void)memcpy(&namebuf[link_len], cp, len + 1);
709 (void)memcpy(namebuf, linkbuf, link_len);
710
711 /*
712 * If absolute pathname, restart at root.
713 * If relative pathname, restart at parent directory.
714 */
715 cp = namebuf;
716 if (*cp == '/') {
717 if (currfd != &nfs_root_node)
718 dealloc(currfd, sizeof(*currfd));
719 currfd = &nfs_root_node;
720 }
721
722 dealloc(newfd, sizeof(*newfd));
723 newfd = 0;
724
725 continue;
726 }
727
728 if (currfd != &nfs_root_node)
729 dealloc(currfd, sizeof(*currfd));
730 currfd = newfd;
731 newfd = 0;
732 }
733
734 error = 0;
735
736 out:
737 #else
738 /* allocate file system specific data structure */
739 currfd = alloc(sizeof(*currfd));
740 currfd->iodesc = nfs_root_node.iodesc;
741 currfd->off = 0;
742 currfd->version = nfs_root_node.version;
743
744 cp = path;
745 /*
746 * Remove extra separators
747 */
748 while (*cp == '/')
749 cp++;
750
751 /* XXX: Check for empty path here? */
752
753 error = nfs_lookupfh(&nfs_root_node, cp, strlen(cp), currfd);
754 #endif
755 if (!error) {
756 f->f_fsdata = (void *)currfd;
757 fsmod = "nfs";
758 return 0;
759 }
760
761 #ifdef NFS_DEBUG
762 if (debug)
763 printf("%s: %s lookupfh failed: %s\n", __func__,
764 path, strerror(error));
765 #endif
766 if (currfd != &nfs_root_node)
767 dealloc(currfd, sizeof(*currfd));
768 if (newfd)
769 dealloc(newfd, sizeof(*newfd));
770
771 return error;
772 }
773
774 __compactcall int
nfs_close(struct open_file * f)775 nfs_close(struct open_file *f)
776 {
777 struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
778
779 #ifdef NFS_DEBUG
780 if (debug)
781 printf("%s: fp=%p\n", __func__, fp);
782 #endif
783
784 if (fp)
785 dealloc(fp, sizeof(struct nfs_iodesc));
786 f->f_fsdata = (void *)0;
787
788 return 0;
789 }
790
791 /*
792 * read a portion of a file
793 */
794 __compactcall int
nfs_read(struct open_file * f,void * buf,size_t size,size_t * resid)795 nfs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
796 {
797 struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
798 ssize_t cc;
799 char *addr = buf;
800
801 #ifdef NFS_DEBUG
802 if (debug)
803 printf("%s: size=%zu off=%" PRIx64 "\n", __func__, size, fp->off);
804 #endif
805 while ((int)size > 0) {
806 #if !defined(LIBSA_NO_TWIDDLE)
807 twiddle();
808 #endif
809 cc = nfs_readdata(fp, fp->off, (void *)addr, size);
810 /* XXX maybe should retry on certain errors */
811 if (cc == -1) {
812 #ifdef NFS_DEBUG
813 if (debug)
814 printf("%s: read: %s\n", __func__,
815 strerror(errno));
816 #endif
817 return errno; /* XXX - from nfs_readdata */
818 }
819 if (cc == 0) {
820 #ifdef NFS_DEBUG
821 if (debug)
822 printf("%s: hit EOF unexpectedly\n", __func__);
823 #endif
824 goto ret;
825 }
826 fp->off += cc;
827 addr += cc;
828 size -= cc;
829 }
830 ret:
831 if (resid)
832 *resid = size;
833
834 return 0;
835 }
836
837 /*
838 * Not implemented.
839 */
840 __compactcall int
nfs_write(struct open_file * f,void * buf,size_t size,size_t * resid)841 nfs_write(struct open_file *f, void *buf, size_t size, size_t *resid)
842 {
843 return EROFS;
844 }
845
846 __compactcall off_t
nfs_seek(struct open_file * f,off_t offset,int where)847 nfs_seek(struct open_file *f, off_t offset, int where)
848 {
849 struct nfs_iodesc *d = (struct nfs_iodesc *)f->f_fsdata;
850 off_t size;
851
852 switch (d->version) {
853 case NFS_VER2:
854 size = ntohl(d->u_fa.v2.fa_size);
855 break;
856 case NFS_VER3:
857 size = getnquad(d->u_fa.v3.fa_size);
858 break;
859 default:
860 return -1;
861 }
862
863 switch (where) {
864 case SEEK_SET:
865 d->off = offset;
866 break;
867 case SEEK_CUR:
868 d->off += offset;
869 break;
870 case SEEK_END:
871 d->off = size - offset;
872 break;
873 default:
874 return -1;
875 }
876
877 return d->off;
878 }
879
880 /* NFNON=0, NFREG=1, NFDIR=2, NFBLK=3, NFCHR=4, NFLNK=5 */
881 const int nfs_stat_types[8] = {
882 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 0 };
883
884 __compactcall int
nfs_stat(struct open_file * f,struct stat * sb)885 nfs_stat(struct open_file *f, struct stat *sb)
886 {
887 struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata;
888 n_long ftype, mode;
889
890 switch (fp->version) {
891 case NFS_VER2:
892 ftype = ntohl(fp->u_fa.v2.fa_type);
893 mode = ntohl(fp->u_fa.v2.fa_mode);
894 sb->st_nlink = ntohl(fp->u_fa.v2.fa_nlink);
895 sb->st_uid = ntohl(fp->u_fa.v2.fa_uid);
896 sb->st_gid = ntohl(fp->u_fa.v2.fa_gid);
897 sb->st_size = ntohl(fp->u_fa.v2.fa_size);
898 break;
899 case NFS_VER3:
900 ftype = ntohl(fp->u_fa.v3.fa_type);
901 mode = ntohl(fp->u_fa.v3.fa_mode);
902 sb->st_nlink = ntohl(fp->u_fa.v3.fa_nlink);
903 sb->st_uid = ntohl(fp->u_fa.v3.fa_uid);
904 sb->st_gid = ntohl(fp->u_fa.v3.fa_gid);
905 sb->st_size = getnquad(fp->u_fa.v3.fa_size);
906 break;
907 default:
908 return -1;
909 }
910
911 mode |= nfs_stat_types[ftype & 7];
912 sb->st_mode = mode;
913
914 return 0;
915 }
916
917 #if defined(LIBSA_ENABLE_LS_OP)
918 #include "ls.h"
919 __compactcall void
nfs_ls(struct open_file * f,const char * pattern)920 nfs_ls(struct open_file *f, const char *pattern)
921 {
922 lsunsup("nfs");
923 }
924 #endif
925