1 /* $OpenBSD: nfs.c,v 1.10 2003/08/11 06:23:09 deraadt Exp $ */ 2 /* $NetBSD: nfs.c,v 1.19 1996/10/13 02:29:04 christos Exp $ */ 3 4 /*- 5 * Copyright (c) 1993 John Brezak 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. The name of the author may not be used to endorse or promote products 17 * derived from this software without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR 20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 21 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 22 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, 23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 24 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR 25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 27 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN 28 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <sys/param.h> 33 #include <sys/time.h> 34 #include <sys/socket.h> 35 #include <sys/stat.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 "saerrno.h" 45 #include "net.h" 46 #include "netif.h" 47 #include "nfs.h" 48 #include "rpc.h" 49 50 /* Define our own NFS attributes without NQNFS stuff. */ 51 struct nfsv2_fattrs { 52 n_long fa_type; 53 n_long fa_mode; 54 n_long fa_nlink; 55 n_long fa_uid; 56 n_long fa_gid; 57 n_long fa_size; 58 n_long fa_blocksize; 59 n_long fa_rdev; 60 n_long fa_blocks; 61 n_long fa_fsid; 62 n_long fa_fileid; 63 struct nfsv2_time fa_atime; 64 struct nfsv2_time fa_mtime; 65 struct nfsv2_time fa_ctime; 66 }; 67 68 69 struct nfs_read_args { 70 u_char fh[NFS_FHSIZE]; 71 n_long off; 72 n_long len; 73 n_long xxx; /* XXX what's this for? */ 74 }; 75 76 /* Data part of nfs rpc reply (also the largest thing we receive) */ 77 #define NFSREAD_SIZE 1024 78 struct nfs_read_repl { 79 n_long errno; 80 struct nfsv2_fattrs fa; 81 n_long count; 82 u_char data[NFSREAD_SIZE]; 83 }; 84 85 struct nfs_readlnk_repl { 86 n_long errno; 87 n_long len; 88 char path[NFS_MAXPATHLEN]; 89 }; 90 91 struct nfs_iodesc { 92 struct iodesc *iodesc; 93 off_t off; 94 u_char fh[NFS_FHSIZE]; 95 struct nfsv2_fattrs fa; /* all in network order */ 96 }; 97 98 struct nfs_iodesc nfs_root_node; 99 100 101 /* 102 * Fetch the root file handle (call mount daemon) 103 * On error, return non-zero and set errno. 104 */ 105 static int 106 nfs_getrootfh(struct iodesc *d, char *path, u_char *fhp) 107 { 108 int len; 109 struct args { 110 n_long len; 111 char path[FNAME_SIZE]; 112 } *args; 113 struct repl { 114 n_long errno; 115 u_char fh[NFS_FHSIZE]; 116 } *repl; 117 struct { 118 n_long h[RPC_HEADER_WORDS]; 119 struct args d; 120 } sdata; 121 struct { 122 n_long h[RPC_HEADER_WORDS]; 123 struct repl d; 124 } rdata; 125 size_t cc; 126 127 #ifdef NFS_DEBUG 128 if (debug) 129 printf("nfs_getrootfh: %s\n", path); 130 #endif 131 132 args = &sdata.d; 133 repl = &rdata.d; 134 135 bzero(args, sizeof(*args)); 136 len = strlen(path); 137 if (len > sizeof(args->path)) 138 len = sizeof(args->path); 139 args->len = htonl(len); 140 bcopy(path, args->path, len); 141 len = 4 + roundup(len, 4); 142 143 cc = rpc_call(d, RPCPROG_MNT, RPCMNT_VER1, RPCMNT_MOUNT, 144 args, len, repl, sizeof(*repl)); 145 if (cc == -1) { 146 /* errno was set by rpc_call */ 147 return (-1); 148 } 149 if (cc < 4) { 150 errno = EBADRPC; 151 return (-1); 152 } 153 if (repl->errno) { 154 errno = ntohl(repl->errno); 155 return (-1); 156 } 157 bcopy(repl->fh, fhp, sizeof(repl->fh)); 158 return (0); 159 } 160 161 /* 162 * Lookup a file. Store handle and attributes. 163 * Return zero or error number. 164 */ 165 static int 166 nfs_lookupfh(struct nfs_iodesc *d, char *name, struct nfs_iodesc *newfd) 167 { 168 int len, rlen; 169 struct args { 170 u_char fh[NFS_FHSIZE]; 171 n_long len; 172 char name[FNAME_SIZE]; 173 } *args; 174 struct repl { 175 n_long errno; 176 u_char fh[NFS_FHSIZE]; 177 struct nfsv2_fattrs fa; 178 } *repl; 179 struct { 180 n_long h[RPC_HEADER_WORDS]; 181 struct args d; 182 } sdata; 183 struct { 184 n_long h[RPC_HEADER_WORDS]; 185 struct repl d; 186 } rdata; 187 ssize_t cc; 188 189 #ifdef NFS_DEBUG 190 if (debug) 191 printf("lookupfh: called\n"); 192 #endif 193 194 args = &sdata.d; 195 repl = &rdata.d; 196 197 bzero(args, sizeof(*args)); 198 bcopy(d->fh, args->fh, sizeof(args->fh)); 199 len = strlen(name); 200 if (len > sizeof(args->name)) 201 len = sizeof(args->name); 202 bcopy(name, args->name, len); 203 args->len = htonl(len); 204 len = 4 + roundup(len, 4); 205 len += NFS_FHSIZE; 206 207 rlen = sizeof(*repl); 208 209 cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_LOOKUP, 210 args, len, repl, rlen); 211 if (cc == -1) 212 return (errno); /* XXX - from rpc_call */ 213 if (cc < 4) 214 return (EIO); 215 if (repl->errno) { 216 /* saerrno.h now matches NFS error numbers. */ 217 return (ntohl(repl->errno)); 218 } 219 bcopy( repl->fh, &newfd->fh, sizeof(newfd->fh)); 220 bcopy(&repl->fa, &newfd->fa, sizeof(newfd->fa)); 221 return (0); 222 } 223 224 /* 225 * Get the destination of a symbolic link. 226 */ 227 static int 228 nfs_readlink(struct nfs_iodesc *d, char *buf) 229 { 230 struct { 231 n_long h[RPC_HEADER_WORDS]; 232 u_char fh[NFS_FHSIZE]; 233 } sdata; 234 struct { 235 n_long h[RPC_HEADER_WORDS]; 236 struct nfs_readlnk_repl d; 237 } rdata; 238 ssize_t cc; 239 240 #ifdef NFS_DEBUG 241 if (debug) 242 printf("readlink: called\n"); 243 #endif 244 245 bcopy(d->fh, sdata.fh, NFS_FHSIZE); 246 cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READLINK, 247 sdata.fh, NFS_FHSIZE, 248 &rdata.d, sizeof(rdata.d)); 249 if (cc == -1) 250 return (errno); 251 252 if (cc < 4) 253 return (EIO); 254 255 if (rdata.d.errno) 256 return (ntohl(rdata.d.errno)); 257 258 rdata.d.len = ntohl(rdata.d.len); 259 if (rdata.d.len > NFS_MAXPATHLEN) 260 return (ENAMETOOLONG); 261 262 bcopy(rdata.d.path, buf, rdata.d.len); 263 buf[rdata.d.len] = 0; 264 return (0); 265 } 266 267 /* 268 * Read data from a file. 269 * Return transfer count or -1 (and set errno) 270 */ 271 static ssize_t 272 nfs_readdata(struct nfs_iodesc *d, off_t off, void *addr, size_t len) 273 { 274 struct nfs_read_args *args; 275 struct nfs_read_repl *repl; 276 struct { 277 n_long h[RPC_HEADER_WORDS]; 278 struct nfs_read_args d; 279 } sdata; 280 struct { 281 n_long h[RPC_HEADER_WORDS]; 282 struct nfs_read_repl d; 283 } rdata; 284 size_t cc; 285 long x; 286 int hlen, rlen; 287 288 args = &sdata.d; 289 repl = &rdata.d; 290 291 bcopy(d->fh, args->fh, NFS_FHSIZE); 292 args->off = htonl((n_long)off); 293 if (len > NFSREAD_SIZE) 294 len = NFSREAD_SIZE; 295 args->len = htonl((n_long)len); 296 args->xxx = htonl((n_long)0); 297 hlen = sizeof(*repl) - NFSREAD_SIZE; 298 299 cc = rpc_call(d->iodesc, NFS_PROG, NFS_VER2, NFSPROC_READ, 300 args, sizeof(*args), 301 repl, sizeof(*repl)); 302 if (cc == -1) { 303 /* errno was already set by rpc_call */ 304 return (-1); 305 } 306 if (cc < hlen) { 307 errno = EBADRPC; 308 return (-1); 309 } 310 if (repl->errno) { 311 errno = ntohl(repl->errno); 312 return (-1); 313 } 314 rlen = cc - hlen; 315 x = ntohl(repl->count); 316 if (rlen < x) { 317 printf("nfsread: short packet, %d < %ld\n", rlen, x); 318 errno = EBADRPC; 319 return(-1); 320 } 321 bcopy(repl->data, addr, x); 322 return (x); 323 } 324 325 /* 326 * nfs_mount - mount this nfs filesystem to a host 327 * On error, return non-zero and set errno. 328 */ 329 int 330 nfs_mount(int sock, struct in_addr ip, char *path) 331 { 332 struct iodesc *desc; 333 struct nfsv2_fattrs *fa; 334 335 if (!(desc = socktodesc(sock))) { 336 errno = EINVAL; 337 return(-1); 338 } 339 340 /* Bind to a reserved port. */ 341 desc->myport = htons(--rpc_port); 342 desc->destip = ip; 343 if (nfs_getrootfh(desc, path, nfs_root_node.fh)) 344 return (-1); 345 nfs_root_node.iodesc = desc; 346 /* Fake up attributes for the root dir. */ 347 fa = &nfs_root_node.fa; 348 fa->fa_type = htonl(NFDIR); 349 fa->fa_mode = htonl(0755); 350 fa->fa_nlink = htonl(2); 351 352 #ifdef NFS_DEBUG 353 if (debug) 354 printf("nfs_mount: got fh for %s\n", path); 355 #endif 356 357 return(0); 358 } 359 360 /* 361 * Open a file. 362 * return zero or error number 363 */ 364 int 365 nfs_open(char *path, struct open_file *f) 366 { 367 struct nfs_iodesc *newfd, *currfd; 368 char namebuf[NFS_MAXPATHLEN + 1], *cp, *ncp; 369 char linkbuf[NFS_MAXPATHLEN + 1]; 370 int nlinks = 0, error = 0, c; 371 372 #ifdef NFS_DEBUG 373 if (debug) 374 printf("nfs_open: %s\n", path); 375 #endif 376 if (nfs_root_node.iodesc == NULL) { 377 printf("nfs_open: must mount first.\n"); 378 return (ENXIO); 379 } 380 381 currfd = &nfs_root_node; 382 newfd = 0; 383 384 cp = path; 385 while (*cp) { 386 /* 387 * Remove extra separators 388 */ 389 while (*cp == '/') 390 cp++; 391 392 if (*cp == '\0') 393 break; 394 /* 395 * Check that current node is a directory. 396 */ 397 if (currfd->fa.fa_type != htonl(NFDIR)) { 398 error = ENOTDIR; 399 goto out; 400 } 401 402 /* allocate file system specific data structure */ 403 newfd = alloc(sizeof(*newfd)); 404 newfd->iodesc = currfd->iodesc; 405 newfd->off = 0; 406 407 /* 408 * Get next component of path name. 409 */ 410 { 411 int len = 0; 412 413 ncp = cp; 414 while ((c = *cp) != '\0' && c != '/') { 415 if (++len > NFS_MAXNAMLEN) { 416 error = ENOENT; 417 goto out; 418 } 419 cp++; 420 } 421 *cp = '\0'; 422 } 423 424 /* lookup a file handle */ 425 error = nfs_lookupfh(currfd, ncp, newfd); 426 *cp = c; 427 if (error) 428 goto out; 429 430 /* 431 * Check for symbolic link 432 */ 433 if (newfd->fa.fa_type == htonl(NFLNK)) { 434 int link_len, len; 435 436 error = nfs_readlink(newfd, linkbuf); 437 if (error) 438 goto out; 439 440 link_len = strlen(linkbuf); 441 len = strlen(cp); 442 443 if (link_len + len > MAXPATHLEN || 444 ++nlinks > MAXSYMLINKS) { 445 error = ENOENT; 446 goto out; 447 } 448 449 bcopy(cp, &namebuf[link_len], len + 1); 450 bcopy(linkbuf, namebuf, link_len); 451 452 /* 453 * If absolute pathname, restart at root. 454 * If relative pathname, restart at parent directory. 455 */ 456 cp = namebuf; 457 if (*cp == '/') { 458 if (currfd != &nfs_root_node) 459 free(currfd, sizeof(*currfd)); 460 currfd = &nfs_root_node; 461 } 462 463 free(newfd, sizeof(*newfd)); 464 newfd = 0; 465 466 continue; 467 } 468 469 if (currfd != &nfs_root_node) 470 free(currfd, sizeof(*currfd)); 471 currfd = newfd; 472 newfd = 0; 473 } 474 475 error = 0; 476 477 out: 478 if (!error) { 479 f->f_fsdata = (void *)currfd; 480 return (0); 481 } 482 483 #ifdef NFS_DEBUG 484 if (debug) 485 printf("nfs_open: %s lookupfh failed: %s\n", 486 path, strerror(error)); 487 #endif 488 if (currfd != &nfs_root_node) 489 free(currfd, sizeof(*currfd)); 490 if (newfd) 491 free(newfd, sizeof(*newfd)); 492 493 return (error); 494 } 495 496 int 497 nfs_close(struct open_file *f) 498 { 499 struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata; 500 501 #ifdef NFS_DEBUG 502 if (debug) 503 printf("nfs_close: fp=%p\n", fp); 504 #endif 505 506 if (fp) 507 free(fp, sizeof(struct nfs_iodesc)); 508 f->f_fsdata = (void *)0; 509 510 return (0); 511 } 512 513 /* 514 * read a portion of a file 515 */ 516 int 517 nfs_read(struct open_file *f, void *buf, size_t size, size_t *resid) 518 { 519 struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata; 520 ssize_t cc; 521 char *addr = buf; 522 523 #ifdef NFS_DEBUG 524 if (debug) 525 printf("nfs_read: size=%d off=%d\n", size, (int)fp->off); 526 #endif 527 while ((int)size > 0) { 528 twiddle(); 529 cc = nfs_readdata(fp, fp->off, (void *)addr, size); 530 /* XXX maybe should retry on certain errors */ 531 if (cc == -1) { 532 #ifdef NFS_DEBUG 533 if (debug) 534 printf("nfs_read: read: %s", strerror(errno)); 535 #endif 536 return (errno); /* XXX - from nfs_readdata */ 537 } 538 if (cc == 0) { 539 if (debug) 540 printf("nfs_read: hit EOF unexpectantly"); 541 goto ret; 542 } 543 fp->off += cc; 544 addr += cc; 545 size -= cc; 546 } 547 ret: 548 if (resid) 549 *resid = size; 550 551 return (0); 552 } 553 554 /* 555 * Not implemented. 556 */ 557 int 558 nfs_write(struct open_file *f, void *buf, size_t size, size_t *resid) 559 { 560 return (EROFS); 561 } 562 563 off_t 564 nfs_seek(struct open_file *f, off_t offset, int where) 565 { 566 struct nfs_iodesc *d = (struct nfs_iodesc *)f->f_fsdata; 567 n_long size = ntohl(d->fa.fa_size); 568 569 switch (where) { 570 case SEEK_SET: 571 d->off = offset; 572 break; 573 case SEEK_CUR: 574 d->off += offset; 575 break; 576 case SEEK_END: 577 d->off = size - offset; 578 break; 579 default: 580 return (-1); 581 } 582 583 return (d->off); 584 } 585 586 /* NFNON=0, NFREG=1, NFDIR=2, NFBLK=3, NFCHR=4, NFLNK=5 */ 587 int nfs_stat_types[8] = { 588 0, S_IFREG, S_IFDIR, S_IFBLK, S_IFCHR, S_IFLNK, 0 }; 589 590 int 591 nfs_stat(struct open_file *f, struct stat *sb) 592 { 593 struct nfs_iodesc *fp = (struct nfs_iodesc *)f->f_fsdata; 594 n_long ftype, mode; 595 596 ftype = ntohl(fp->fa.fa_type); 597 mode = ntohl(fp->fa.fa_mode); 598 mode |= nfs_stat_types[ftype & 7]; 599 600 sb->st_mode = mode; 601 sb->st_nlink = ntohl(fp->fa.fa_nlink); 602 sb->st_uid = ntohl(fp->fa.fa_uid); 603 sb->st_gid = ntohl(fp->fa.fa_gid); 604 sb->st_size = ntohl(fp->fa.fa_size); 605 606 return (0); 607 } 608 609 /* 610 * Not implemented. 611 */ 612 #ifndef NO_READDIR 613 int 614 nfs_readdir(struct open_file *f, char *name) 615 { 616 return (EROFS); 617 } 618 #endif 619