1 /* $OpenBSD: mount_nfs.c,v 1.53 2016/05/27 19:45:04 deraadt Exp $ */ 2 /* $NetBSD: mount_nfs.c,v 1.12.4.1 1996/05/25 22:48:05 fvdl Exp $ */ 3 4 /* 5 * Copyright (c) 1992, 1993, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Rick Macklem at The University of Guelph. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/types.h> 37 #include <sys/mount.h> 38 #include <sys/socket.h> 39 #include <sys/socketvar.h> 40 #include <sys/stat.h> 41 #include <syslog.h> 42 43 #include <rpc/rpc.h> 44 #include <rpc/pmap_clnt.h> 45 #include <rpc/pmap_prot.h> 46 47 #include <nfs/rpcv2.h> 48 #include <nfs/nfsproto.h> 49 #include <nfs/nfs.h> 50 51 #include <arpa/inet.h> 52 53 #include <ctype.h> 54 #include <err.h> 55 #include <errno.h> 56 #include <fcntl.h> 57 #include <netdb.h> 58 #include <signal.h> 59 #include <stdio.h> 60 #include <stdlib.h> 61 #include <string.h> 62 #include <unistd.h> 63 #include <limits.h> 64 65 #include "mntopts.h" 66 67 #define ALTF_BG 0x1 68 #define ALTF_NOCONN 0x2 69 #define ALTF_DUMBTIMR 0x4 70 #define ALTF_INTR 0x8 71 #define ALTF_NFSV3 0x20 72 #define ALTF_RDIRPLUS 0x40 73 #define ALTF_MNTUDP 0x80 74 #define ALTF_RESVPORT 0x100 75 #define ALTF_SEQPACKET 0x200 76 #define ALTF_SOFT 0x800 77 #define ALTF_TCP 0x1000 78 #define ALTF_PORT 0x2000 79 #define ALTF_NFSV2 0x4000 80 #define ALTF_NOAC 0x8000 81 #define ALTF_ACREGMIN 0x10000 82 #define ALTF_ACREGMAX 0x20000 83 #define ALTF_ACDIRMIN 0x40000 84 #define ALTF_ACDIRMAX 0x80000 85 86 const struct mntopt mopts[] = { 87 MOPT_STDOPTS, 88 MOPT_WXALLOWED, 89 MOPT_FORCE, 90 MOPT_UPDATE, 91 MOPT_SYNC, 92 { "bg", ALTF_BG, 0 }, 93 { "conn", ALTF_NOCONN, MFLAG_INVERSE }, 94 { "dumbtimer", ALTF_DUMBTIMR, 0 }, 95 { "intr", ALTF_INTR, 0 }, 96 { "nfsv3", ALTF_NFSV3, 0 }, 97 { "rdirplus", ALTF_RDIRPLUS, 0 }, 98 { "mntudp", ALTF_MNTUDP, 0 }, 99 { "resvport", ALTF_RESVPORT, 0 }, 100 { "soft", ALTF_SOFT, 0 }, 101 { "tcp", ALTF_TCP, 0 }, 102 { "port", ALTF_PORT, MFLAG_INTVAL }, 103 { "nfsv2", ALTF_NFSV2, 0 }, 104 { "ac", ALTF_NOAC, MFLAG_INVERSE }, 105 { "acregmin", ALTF_ACREGMIN, MFLAG_INTVAL }, 106 { "acregmax", ALTF_ACREGMAX, MFLAG_INTVAL }, 107 { "acdirmin", ALTF_ACDIRMIN, MFLAG_INTVAL }, 108 { "acdirmax", ALTF_ACDIRMAX, MFLAG_INTVAL }, 109 { NULL } 110 }; 111 112 struct nfs_args nfsdefargs = { 113 NFS_ARGSVERSION, 114 NULL, 115 sizeof (struct sockaddr_in), 116 SOCK_DGRAM, 117 0, 118 NULL, 119 0, 120 NFSMNT_NFSV3, 121 NFS_WSIZE, 122 NFS_RSIZE, 123 NFS_READDIRSIZE, 124 10, 125 NFS_RETRANS, 126 NFS_MAXGRPS, 127 NFS_DEFRAHEAD, 128 0, 129 0, 130 NULL, 131 0, 132 0, 133 0, 134 0 135 }; 136 137 struct nfhret { 138 u_long stat; 139 long vers; 140 long auth; 141 long fhsize; 142 u_char nfh[NFSX_V3FHMAX]; 143 }; 144 #define DEF_RETRY 10000 145 #define BGRND 1 146 #define ISBGRND 2 147 int retrycnt; 148 int opflags = 0; 149 int nfsproto = IPPROTO_UDP; 150 int mnttcp_ok = 1; 151 u_short port_no = 0; 152 int force2 = 0; 153 int force3 = 0; 154 155 int getnfsargs(char *, struct nfs_args *); 156 void set_rpc_maxgrouplist(int); 157 __dead void usage(void); 158 int xdr_dir(XDR *, char *); 159 int xdr_fh(XDR *, struct nfhret *); 160 161 int 162 main(int argc, char *argv[]) 163 { 164 int c; 165 struct nfs_args *nfsargsp; 166 struct nfs_args nfsargs; 167 int mntflags, num; 168 char name[PATH_MAX], *options = NULL, *spec; 169 const char *p; 170 union mntval value; 171 172 retrycnt = DEF_RETRY; 173 174 mntflags = 0; 175 nfsargs = nfsdefargs; 176 nfsargsp = &nfsargs; 177 while ((c = getopt(argc, argv, 178 "23a:bcdD:g:I:iL:lo:PR:r:sTt:w:x:U")) != -1) 179 switch (c) { 180 case '3': 181 if (force2) 182 errx(1, "-2 and -3 are mutually exclusive"); 183 force3 = 1; 184 break; 185 case '2': 186 if (force3) 187 errx(1, "-2 and -3 are mutually exclusive"); 188 force2 = 1; 189 nfsargsp->flags &= ~NFSMNT_NFSV3; 190 break; 191 case 'a': 192 num = (int) strtonum(optarg, 0, 4, &p); 193 if (p) 194 errx(1, "illegal -a value %s: %s", optarg, p); 195 nfsargsp->readahead = num; 196 nfsargsp->flags |= NFSMNT_READAHEAD; 197 break; 198 case 'b': 199 opflags |= BGRND; 200 break; 201 case 'c': 202 nfsargsp->flags |= NFSMNT_NOCONN; 203 break; 204 case 'D': 205 /* backward compatibility */ 206 break; 207 case 'd': 208 nfsargsp->flags |= NFSMNT_DUMBTIMR; 209 break; 210 case 'g': 211 num = (int) strtonum(optarg, 1, NGROUPS_MAX, &p); 212 if (p) 213 errx(1, "illegal -g value %s: %s", optarg, p); 214 set_rpc_maxgrouplist(num); 215 nfsargsp->maxgrouplist = num; 216 nfsargsp->flags |= NFSMNT_MAXGRPS; 217 break; 218 case 'I': 219 num = (int) strtonum(optarg, 1, INT_MAX, &p); 220 if (p) 221 errx(1, "illegal -I value %s: %s", optarg, p); 222 nfsargsp->readdirsize = num; 223 nfsargsp->flags |= NFSMNT_READDIRSIZE; 224 break; 225 case 'i': 226 nfsargsp->flags |= NFSMNT_INT; 227 break; 228 case 'L': 229 /* backward compatibility */ 230 break; 231 case 'l': 232 nfsargsp->flags |= NFSMNT_RDIRPLUS; 233 break; 234 case 'o': 235 options = optarg; 236 while (options != NULL) { 237 switch (getmntopt(&options, &value, mopts, 238 &mntflags)) { 239 case ALTF_BG: 240 opflags |= BGRND; 241 break; 242 case ALTF_NOCONN: 243 nfsargsp->flags |= NFSMNT_NOCONN; 244 break; 245 case ALTF_DUMBTIMR: 246 nfsargsp->flags |= NFSMNT_DUMBTIMR; 247 break; 248 case ALTF_INTR: 249 nfsargsp->flags |= NFSMNT_INT; 250 break; 251 case ALTF_NFSV3: 252 if (force2) 253 errx(1, 254 "conflicting version options"); 255 force3 = 1; 256 break; 257 case ALTF_NFSV2: 258 if (force3) 259 errx(1, 260 "conflicting version options"); 261 force2 = 1; 262 nfsargsp->flags &= ~NFSMNT_NFSV3; 263 break; 264 case ALTF_RDIRPLUS: 265 nfsargsp->flags |= NFSMNT_RDIRPLUS; 266 break; 267 case ALTF_MNTUDP: 268 mnttcp_ok = 0; 269 break; 270 case ALTF_RESVPORT: 271 nfsargsp->flags |= NFSMNT_RESVPORT; 272 break; 273 case ALTF_SOFT: 274 nfsargsp->flags |= NFSMNT_SOFT; 275 break; 276 case ALTF_TCP: 277 nfsargsp->sotype = SOCK_STREAM; 278 nfsproto = IPPROTO_TCP; 279 break; 280 case ALTF_PORT: 281 port_no = value.ival; 282 break; 283 case ALTF_NOAC: 284 nfsargsp->flags |= (NFSMNT_ACREGMIN | 285 NFSMNT_ACREGMAX | NFSMNT_ACDIRMIN | 286 NFSMNT_ACDIRMAX); 287 nfsargsp->acregmin = 0; 288 nfsargsp->acregmax = 0; 289 nfsargsp->acdirmin = 0; 290 nfsargsp->acdirmax = 0; 291 break; 292 case ALTF_ACREGMIN: 293 nfsargsp->flags |= NFSMNT_ACREGMIN; 294 nfsargsp->acregmin = value.ival; 295 break; 296 case ALTF_ACREGMAX: 297 nfsargsp->flags |= NFSMNT_ACREGMAX; 298 nfsargsp->acregmax = value.ival; 299 break; 300 case ALTF_ACDIRMIN: 301 nfsargsp->flags |= NFSMNT_ACDIRMIN; 302 nfsargsp->acdirmin = value.ival; 303 break; 304 case ALTF_ACDIRMAX: 305 nfsargsp->flags |= NFSMNT_ACDIRMAX; 306 nfsargsp->acdirmax = value.ival; 307 break; 308 } 309 } 310 break; 311 case 'P': 312 /* backward compatibility */ 313 break; 314 case 'R': 315 num = (int) strtonum(optarg, 1, INT_MAX, &p); 316 if (p) 317 errx(1, "illegal -R value %s: %s", optarg, p); 318 retrycnt = num; 319 break; 320 case 'r': 321 num = (int) strtonum(optarg, 1, INT_MAX, &p); 322 if (p) 323 errx(1, "illegal -r value %s: %s", optarg, p); 324 nfsargsp->rsize = num; 325 nfsargsp->flags |= NFSMNT_RSIZE; 326 break; 327 case 's': 328 nfsargsp->flags |= NFSMNT_SOFT; 329 break; 330 case 'T': 331 nfsargsp->sotype = SOCK_STREAM; 332 nfsproto = IPPROTO_TCP; 333 break; 334 case 't': 335 num = (int) strtonum(optarg, 1, INT_MAX, &p); 336 if (p) 337 errx(1, "illegal -t value %s: %s", optarg, p); 338 nfsargsp->timeo = num; 339 nfsargsp->flags |= NFSMNT_TIMEO; 340 break; 341 case 'w': 342 num = (int) strtonum(optarg, 1, INT_MAX, &p); 343 if (p) 344 errx(1, "illegal -w value %s: %s", optarg, p); 345 nfsargsp->wsize = num; 346 nfsargsp->flags |= NFSMNT_WSIZE; 347 break; 348 case 'x': 349 num = (int) strtonum(optarg, 1, INT_MAX, &p); 350 if (p) 351 errx(1, "illegal -x value %s: %s", optarg, p); 352 nfsargsp->retrans = num; 353 nfsargsp->flags |= NFSMNT_RETRANS; 354 break; 355 case 'U': 356 mnttcp_ok = 0; 357 break; 358 default: 359 usage(); 360 /* NOTREACHED */ 361 } 362 argc -= optind; 363 argv += optind; 364 365 if (argc != 2) 366 usage(); 367 368 spec = *argv++; 369 if (realpath(*argv, name) == NULL) 370 err(1, "realpath %s", *argv); 371 372 if (!getnfsargs(spec, nfsargsp)) 373 exit(1); 374 if (mount(MOUNT_NFS, name, mntflags, nfsargsp)) { 375 if (errno == EOPNOTSUPP) 376 errx(1, "%s: Filesystem not supported by kernel", name); 377 else 378 err(1, "%s", name); 379 } 380 exit(0); 381 } 382 383 int 384 getnfsargs(char *spec, struct nfs_args *nfsargsp) 385 { 386 CLIENT *clp; 387 struct hostent *hp; 388 static struct sockaddr_in saddr; 389 struct timeval pertry, try; 390 enum clnt_stat clnt_stat; 391 int so = RPC_ANYSOCK, i, nfsvers, mntvers, orgcnt; 392 char *hostp, *delimp; 393 u_short tport; 394 static struct nfhret nfhret; 395 static char nam[MNAMELEN + 1]; 396 397 if (strlcpy(nam, spec, sizeof(nam)) >= sizeof(nam)) { 398 errx(1, "hostname too long"); 399 } 400 401 if ((delimp = strchr(spec, '@')) != NULL) { 402 hostp = delimp + 1; 403 } else if ((delimp = strchr(spec, ':')) != NULL) { 404 hostp = spec; 405 spec = delimp + 1; 406 } else { 407 warnx("no <host>:<dirpath> or <dirpath>@<host> spec"); 408 return (0); 409 } 410 *delimp = '\0'; 411 412 /* 413 * Handle an internet host address 414 */ 415 if (inet_aton(hostp, &saddr.sin_addr) == 0) { 416 hp = gethostbyname(hostp); 417 if (hp == NULL) { 418 warnx("can't resolve address for host %s", hostp); 419 return (0); 420 } 421 memcpy(&saddr.sin_addr, hp->h_addr, hp->h_length); 422 } 423 424 if (force2) { 425 nfsvers = NFS_VER2; 426 mntvers = RPCMNT_VER1; 427 } else { 428 nfsvers = NFS_VER3; 429 mntvers = RPCMNT_VER3; 430 } 431 orgcnt = retrycnt; 432 tryagain: 433 nfhret.stat = EACCES; /* Mark not yet successful */ 434 while (retrycnt > 0) { 435 saddr.sin_family = AF_INET; 436 saddr.sin_port = htons(PMAPPORT); 437 if ((tport = port_no ? port_no : pmap_getport(&saddr, 438 RPCPROG_NFS, nfsvers, nfsargsp->sotype == SOCK_STREAM ? 439 IPPROTO_TCP : IPPROTO_UDP)) == 0) { 440 if ((opflags & ISBGRND) == 0) 441 clnt_pcreateerror("NFS Portmap"); 442 } else { 443 saddr.sin_port = 0; 444 pertry.tv_sec = 10; 445 pertry.tv_usec = 0; 446 if (mnttcp_ok && nfsargsp->sotype == SOCK_STREAM) 447 clp = clnttcp_create(&saddr, RPCPROG_MNT, mntvers, 448 &so, 0, 0); 449 else 450 clp = clntudp_create(&saddr, RPCPROG_MNT, mntvers, 451 pertry, &so); 452 if (clp == NULL) { 453 if ((opflags & ISBGRND) == 0) 454 clnt_pcreateerror("Cannot MNT RPC"); 455 } else { 456 clp->cl_auth = authunix_create_default(); 457 try.tv_sec = 10; 458 try.tv_usec = 0; 459 nfhret.auth = RPCAUTH_UNIX; 460 nfhret.vers = mntvers; 461 clnt_stat = clnt_call(clp, RPCMNT_MOUNT, 462 xdr_dir, spec, xdr_fh, &nfhret, try); 463 if (clnt_stat != RPC_SUCCESS) { 464 if (clnt_stat == RPC_PROGVERSMISMATCH) { 465 if (nfsvers == NFS_VER3 && 466 !force3) { 467 retrycnt = orgcnt; 468 nfsvers = NFS_VER2; 469 mntvers = RPCMNT_VER1; 470 nfsargsp->flags &= 471 ~NFSMNT_NFSV3; 472 goto tryagain; 473 } else { 474 warnx("%s", 475 clnt_sperror(clp, 476 "MNT RPC")); 477 } 478 } 479 if ((opflags & ISBGRND) == 0) 480 warnx("%s", clnt_sperror(clp, 481 "bad MNT RPC")); 482 } else { 483 auth_destroy(clp->cl_auth); 484 clnt_destroy(clp); 485 retrycnt = 0; 486 } 487 } 488 } 489 if (--retrycnt > 0) { 490 if (opflags & BGRND) { 491 opflags &= ~BGRND; 492 if ((i = fork())) { 493 if (i == -1) 494 err(1, "fork"); 495 exit(0); 496 } 497 (void) setsid(); 498 (void) close(STDIN_FILENO); 499 (void) close(STDOUT_FILENO); 500 (void) close(STDERR_FILENO); 501 (void) chdir("/"); 502 opflags |= ISBGRND; 503 } 504 sleep(60); 505 } 506 } 507 if (nfhret.stat) { 508 if (opflags & ISBGRND) 509 exit(1); 510 warnc(nfhret.stat, "can't access %s", spec); 511 return (0); 512 } 513 saddr.sin_port = htons(tport); 514 nfsargsp->addr = (struct sockaddr *) &saddr; 515 nfsargsp->addrlen = sizeof (saddr); 516 nfsargsp->fh = nfhret.nfh; 517 nfsargsp->fhsize = nfhret.fhsize; 518 nfsargsp->hostname = nam; 519 return (1); 520 } 521 522 /* 523 * xdr routines for mount rpc's 524 */ 525 int 526 xdr_dir(XDR *xdrsp, char *dirp) 527 { 528 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 529 } 530 531 int 532 xdr_fh(XDR *xdrsp, struct nfhret *np) 533 { 534 int i; 535 long auth, authcnt, authfnd = 0; 536 537 if (!xdr_u_long(xdrsp, &np->stat)) 538 return (0); 539 if (np->stat) 540 return (1); 541 switch (np->vers) { 542 case 1: 543 np->fhsize = NFSX_V2FH; 544 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH)); 545 case 3: 546 if (!xdr_long(xdrsp, &np->fhsize)) 547 return (0); 548 if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX) 549 return (0); 550 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize)) 551 return (0); 552 if (!xdr_long(xdrsp, &authcnt)) 553 return (0); 554 for (i = 0; i < authcnt; i++) { 555 if (!xdr_long(xdrsp, &auth)) 556 return (0); 557 if (auth == np->auth) 558 authfnd++; 559 } 560 /* 561 * Some servers, such as DEC's OSF/1 return a nil authenticator 562 * list to indicate RPCAUTH_UNIX. 563 */ 564 if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX)) 565 np->stat = EAUTH; 566 return (1); 567 }; 568 return (0); 569 } 570 571 __dead void 572 usage(void) 573 { 574 extern char *__progname; 575 576 (void)fprintf(stderr, 577 "usage: %s [-23bcdilsTU] [-a maxreadahead] [-g maxgroups]\n" 578 "\t[-I readdirsize] [-o options] [-R retrycnt] [-r readsize]\n" 579 "\t[-t timeout] [-w writesize] [-x retrans] rhost:path node\n", 580 __progname); 581 exit(1); 582 } 583