1 /* 2 * Copyright (c) 1992, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * Rick Macklem at The University of Guelph. 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. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California. All rights reserved. 37 * @(#)mount_nfs.c 8.11 (Berkeley) 5/4/95 38 * $FreeBSD: src/sbin/mount_nfs/mount_nfs.c,v 1.36.2.6 2003/05/13 14:45:40 trhodes Exp $ 39 * $DragonFly: src/sbin/mount_nfs/mount_nfs.c,v 1.8 2004/02/04 17:40:00 joerg Exp $ 40 */ 41 42 #include <sys/param.h> 43 #include <sys/mount.h> 44 #include <sys/stat.h> 45 #include <sys/syslog.h> 46 47 #include <rpc/rpc.h> 48 #include <rpc/pmap_clnt.h> 49 #include <rpc/pmap_prot.h> 50 51 #include <vfs/nfs/rpcv2.h> 52 #include <vfs/nfs/nfsproto.h> 53 #include <vfs/nfs/nfs.h> 54 #include <vfs/nfs/nqnfs.h> 55 56 #include <arpa/inet.h> 57 58 #include <ctype.h> 59 #include <err.h> 60 #include <errno.h> 61 #include <netdb.h> 62 #include <stdio.h> 63 #include <stdlib.h> 64 #include <strings.h> 65 #include <sysexits.h> 66 #include <unistd.h> 67 #include <resolv.h> 68 69 #include "mntopts.h" 70 #include "mounttab.h" 71 72 #define ALTF_BG 0x1 73 #define ALTF_NOCONN 0x2 74 #define ALTF_DUMBTIMR 0x4 75 #define ALTF_INTR 0x8 76 #define ALTF_KERB 0x10 77 #define ALTF_NFSV3 0x20 78 #define ALTF_RDIRPLUS 0x40 79 #define ALTF_MNTUDP 0x80 80 #define ALTF_RESVPORT 0x100 81 #define ALTF_SEQPACKET 0x200 82 #define ALTF_NQNFS 0x400 83 #define ALTF_SOFT 0x800 84 #define ALTF_TCP 0x1000 85 #define ALTF_PORT 0x2000 86 #define ALTF_NFSV2 0x4000 87 #define ALTF_ACREGMIN 0x8000 88 #define ALTF_ACREGMAX 0x10000 89 #define ALTF_ACDIRMIN 0x20000 90 #define ALTF_ACDIRMAX 0x40000 91 92 struct mntopt mopts[] = { 93 MOPT_STDOPTS, 94 MOPT_FORCE, 95 MOPT_UPDATE, 96 MOPT_ASYNC, 97 { "bg", 0, ALTF_BG, 1 }, 98 { "conn", 1, ALTF_NOCONN, 1 }, 99 { "dumbtimer", 0, ALTF_DUMBTIMR, 1 }, 100 { "intr", 0, ALTF_INTR, 1 }, 101 #ifdef NFSKERB 102 { "kerb", 0, ALTF_KERB, 1 }, 103 #endif 104 { "nfsv3", 0, ALTF_NFSV3, 1 }, 105 { "rdirplus", 0, ALTF_RDIRPLUS, 1 }, 106 { "mntudp", 0, ALTF_MNTUDP, 1 }, 107 { "resvport", 0, ALTF_RESVPORT, 1 }, 108 { "nqnfs", 0, ALTF_NQNFS, 1 }, 109 { "soft", 0, ALTF_SOFT, 1 }, 110 { "tcp", 0, ALTF_TCP, 1 }, 111 { "port=", 0, ALTF_PORT, 1 }, 112 { "nfsv2", 0, ALTF_NFSV2, 1 }, 113 { "acregmin=", 0, ALTF_ACREGMIN, 1 }, 114 { "acregmax=", 0, ALTF_ACREGMAX, 1 }, 115 { "acdirmin=", 0, ALTF_ACDIRMIN, 1 }, 116 { "acdirmax=", 0, ALTF_ACDIRMAX, 1 }, 117 { NULL } 118 }; 119 120 struct nfs_args nfsdefargs = { 121 NFS_ARGSVERSION, 122 (struct sockaddr *)0, 123 sizeof (struct sockaddr_in), 124 SOCK_DGRAM, 125 0, 126 (u_char *)0, 127 0, 128 NFSMNT_RESVPORT, 129 NFS_WSIZE, 130 NFS_RSIZE, 131 NFS_READDIRSIZE, 132 10, 133 NFS_RETRANS, 134 NFS_MAXGRPS, 135 NFS_DEFRAHEAD, 136 NQ_DEFLEASE, 137 NQ_DEADTHRESH, 138 (char *)0, 139 /* args version 4 */ 140 NFS_MINATTRTIMO, 141 NFS_MAXATTRTIMO, 142 NFS_MINDIRATTRTIMO, 143 NFS_MAXDIRATTRTIMO, 144 }; 145 146 struct nfhret { 147 u_long stat; 148 long vers; 149 long auth; 150 long fhsize; 151 u_char nfh[NFSX_V3FHMAX]; 152 }; 153 154 #define BGRND 0x0001 155 #define ISBGRND 0x0002 156 #define DIDWARN 0x0004 157 158 int retrycnt = -1; 159 int opflags = 0; 160 int nfsproto = IPPROTO_UDP; 161 int mnttcp_ok = 1; 162 u_short port_no = 0; 163 enum mountmode { 164 ANY, 165 V2, 166 V3 167 } mountmode = ANY; 168 169 #ifdef NFSKERB 170 char inst[INST_SZ]; 171 char realm[REALM_SZ]; 172 struct { 173 u_long kind; 174 KTEXT_ST kt; 175 } ktick; 176 struct nfsrpc_nickverf kverf; 177 struct nfsrpc_fullblock kin, kout; 178 NFSKERBKEY_T kivec; 179 CREDENTIALS kcr; 180 struct timeval ktv; 181 NFSKERBKEYSCHED_T kerb_keysched; 182 #endif 183 184 /* Return codes for nfs_tryproto. */ 185 enum tryret { 186 TRYRET_SUCCESS, 187 TRYRET_TIMEOUT, /* No response received. */ 188 TRYRET_REMOTEERR, /* Error received from remote server. */ 189 TRYRET_LOCALERR /* Local failure. */ 190 }; 191 192 int getnfsargs(char *, struct nfs_args *); 193 void set_rpc_maxgrouplist(int); 194 void usage(void) __dead2; 195 int xdr_dir(XDR *, char *); 196 int xdr_fh(XDR *, struct nfhret *); 197 enum tryret nfs_tryproto(struct nfs_args *nfsargsp, struct sockaddr_in *sin, 198 char *hostp, char *spec, char **errstr); 199 enum tryret returncode(enum clnt_stat stat, struct rpc_err *rpcerr); 200 201 /* 202 * Used to set mount flags with getmntopts. Call with dir=TRUE to 203 * initialize altflags from the current mount flags. Call with 204 * dir=FALSE to update mount flags with the new value of altflags after 205 * the call to getmntopts. 206 */ 207 static void 208 set_flags(int* altflags, int* nfsflags, int dir) 209 { 210 #define F2(af, nf) \ 211 if (dir) { \ 212 if (*nfsflags & NFSMNT_##nf) \ 213 *altflags |= ALTF_##af; \ 214 else \ 215 *altflags &= ~ALTF_##af; \ 216 } else { \ 217 if (*altflags & ALTF_##af) \ 218 *nfsflags |= NFSMNT_##nf; \ 219 else \ 220 *nfsflags &= ~NFSMNT_##nf; \ 221 } 222 #define F(f) F2(f,f) 223 224 F(NOCONN); 225 F(DUMBTIMR); 226 F2(INTR, INT); 227 #ifdef NFSKERB 228 F(KERB); 229 #endif 230 F(RDIRPLUS); 231 F(RESVPORT); 232 F(NQNFS); 233 F(SOFT); 234 F(ACREGMIN); 235 F(ACREGMAX); 236 F(ACDIRMIN); 237 F(ACDIRMAX); 238 239 #undef F 240 #undef F2 241 } 242 243 int 244 main(int argc, char **argv) 245 { 246 register int c; 247 register struct nfs_args *nfsargsp; 248 struct nfs_args nfsargs; 249 struct nfsd_cargs ncd; 250 int mntflags, altflags, nfssvc_flag, num; 251 char *name, *p, *spec; 252 char mntpath[MAXPATHLEN]; 253 struct vfsconf vfc; 254 int error = 0; 255 #ifdef NFSKERB 256 uid_t last_ruid; 257 258 last_ruid = -1; 259 (void)strcpy(realm, KRB_REALM); 260 if (sizeof (struct nfsrpc_nickverf) != RPCX_NICKVERF || 261 sizeof (struct nfsrpc_fullblock) != RPCX_FULLBLOCK || 262 ((char *)&ktick.kt) - ((char *)&ktick) != NFSX_UNSIGNED || 263 ((char *)ktick.kt.dat) - ((char *)&ktick) != 2 * NFSX_UNSIGNED) 264 fprintf(stderr, "Yikes! NFSKERB structs not packed!!\n"); 265 #endif /* NFSKERB */ 266 267 mntflags = 0; 268 altflags = 0; 269 nfsargs = nfsdefargs; 270 nfsargsp = &nfsargs; 271 while ((c = getopt(argc, argv, 272 "23a:bcdD:g:I:iKL:lm:No:PqR:r:sTt:w:x:U")) != -1) 273 switch (c) { 274 case '2': 275 mountmode = V2; 276 break; 277 case '3': 278 mountmode = V3; 279 break; 280 case 'a': 281 num = strtol(optarg, &p, 10); 282 if (*p || num < 0) 283 errx(1, "illegal -a value -- %s", optarg); 284 nfsargsp->readahead = num; 285 nfsargsp->flags |= NFSMNT_READAHEAD; 286 break; 287 case 'b': 288 opflags |= BGRND; 289 break; 290 case 'c': 291 nfsargsp->flags |= NFSMNT_NOCONN; 292 break; 293 case 'D': 294 num = strtol(optarg, &p, 10); 295 if (*p || num <= 0) 296 errx(1, "illegal -D value -- %s", optarg); 297 nfsargsp->deadthresh = num; 298 nfsargsp->flags |= NFSMNT_DEADTHRESH; 299 break; 300 case 'd': 301 nfsargsp->flags |= NFSMNT_DUMBTIMR; 302 break; 303 case 'g': 304 num = strtol(optarg, &p, 10); 305 if (*p || num <= 0) 306 errx(1, "illegal -g value -- %s", optarg); 307 set_rpc_maxgrouplist(num); 308 nfsargsp->maxgrouplist = num; 309 nfsargsp->flags |= NFSMNT_MAXGRPS; 310 break; 311 case 'I': 312 num = strtol(optarg, &p, 10); 313 if (*p || num <= 0) 314 errx(1, "illegal -I value -- %s", optarg); 315 nfsargsp->readdirsize = num; 316 nfsargsp->flags |= NFSMNT_READDIRSIZE; 317 break; 318 case 'i': 319 nfsargsp->flags |= NFSMNT_INT; 320 break; 321 #ifdef NFSKERB 322 case 'K': 323 nfsargsp->flags |= NFSMNT_KERB; 324 break; 325 #endif 326 case 'L': 327 num = strtol(optarg, &p, 10); 328 if (*p || num < 2) 329 errx(1, "illegal -L value -- %s", optarg); 330 nfsargsp->leaseterm = num; 331 nfsargsp->flags |= NFSMNT_LEASETERM; 332 break; 333 case 'l': 334 nfsargsp->flags |= NFSMNT_RDIRPLUS; 335 break; 336 #ifdef NFSKERB 337 case 'm': 338 (void)strncpy(realm, optarg, REALM_SZ - 1); 339 realm[REALM_SZ - 1] = '\0'; 340 break; 341 #endif 342 case 'N': 343 nfsargsp->flags &= ~NFSMNT_RESVPORT; 344 break; 345 case 'o': 346 altflags = 0; 347 set_flags(&altflags, &nfsargsp->flags, TRUE); 348 if (mountmode == V2) 349 altflags |= ALTF_NFSV2; 350 else if (mountmode == V3) 351 altflags |= ALTF_NFSV3; 352 getmntopts(optarg, mopts, &mntflags, &altflags); 353 set_flags(&altflags, &nfsargsp->flags, FALSE); 354 /* 355 * Handle altflags which don't map directly to 356 * mount flags. 357 */ 358 if(altflags & ALTF_BG) 359 opflags |= BGRND; 360 if(altflags & ALTF_MNTUDP) 361 mnttcp_ok = 0; 362 if(altflags & ALTF_TCP) { 363 nfsargsp->sotype = SOCK_STREAM; 364 nfsproto = IPPROTO_TCP; 365 } 366 if(altflags & ALTF_PORT) 367 port_no = atoi(strstr(optarg, "port=") + 5); 368 mountmode = ANY; 369 if(altflags & ALTF_NFSV2) 370 mountmode = V2; 371 if(altflags & ALTF_NFSV3) 372 mountmode = V3; 373 if(altflags & ALTF_ACREGMIN) 374 nfsargsp->acregmin = atoi(strstr(optarg, 375 "acregmin=") + 9); 376 if(altflags & ALTF_ACREGMAX) 377 nfsargsp->acregmax = atoi(strstr(optarg, 378 "acregmax=") + 9); 379 if(altflags & ALTF_ACDIRMIN) 380 nfsargsp->acdirmin = atoi(strstr(optarg, 381 "acdirmin=") + 9); 382 if(altflags & ALTF_ACDIRMAX) 383 nfsargsp->acdirmax = atoi(strstr(optarg, 384 "acdirmax=") + 9); 385 break; 386 case 'P': 387 /* obsolete for NFSMNT_RESVPORT, now default */ 388 break; 389 case 'q': 390 mountmode = V3; 391 nfsargsp->flags |= NFSMNT_NQNFS; 392 break; 393 case 'R': 394 num = strtol(optarg, &p, 10); 395 if (*p || num < 0) 396 errx(1, "illegal -R value -- %s", optarg); 397 retrycnt = num; 398 break; 399 case 'r': 400 num = strtol(optarg, &p, 10); 401 if (*p || num <= 0) 402 errx(1, "illegal -r value -- %s", optarg); 403 nfsargsp->rsize = num; 404 nfsargsp->flags |= NFSMNT_RSIZE; 405 break; 406 case 's': 407 nfsargsp->flags |= NFSMNT_SOFT; 408 break; 409 case 'T': 410 nfsargsp->sotype = SOCK_STREAM; 411 nfsproto = IPPROTO_TCP; 412 break; 413 case 't': 414 num = strtol(optarg, &p, 10); 415 if (*p || num <= 0) 416 errx(1, "illegal -t value -- %s", optarg); 417 nfsargsp->timeo = num; 418 nfsargsp->flags |= NFSMNT_TIMEO; 419 break; 420 case 'w': 421 num = strtol(optarg, &p, 10); 422 if (*p || num <= 0) 423 errx(1, "illegal -w value -- %s", optarg); 424 nfsargsp->wsize = num; 425 nfsargsp->flags |= NFSMNT_WSIZE; 426 break; 427 case 'x': 428 num = strtol(optarg, &p, 10); 429 if (*p || num <= 0) 430 errx(1, "illegal -x value -- %s", optarg); 431 nfsargsp->retrans = num; 432 nfsargsp->flags |= NFSMNT_RETRANS; 433 break; 434 case 'U': 435 mnttcp_ok = 0; 436 break; 437 default: 438 usage(); 439 break; 440 } 441 argc -= optind; 442 argv += optind; 443 444 if (argc != 2) { 445 usage(); 446 /* NOTREACHED */ 447 } 448 449 spec = *argv++; 450 name = *argv; 451 452 if (retrycnt == -1) 453 /* The default is to keep retrying forever. */ 454 retrycnt = 0; 455 if (!getnfsargs(spec, nfsargsp)) 456 exit(1); 457 458 /* resolve the mountpoint with realpath(3) */ 459 (void)checkpath(name, mntpath); 460 461 error = getvfsbyname("nfs", &vfc); 462 if (error && vfsisloadable("nfs")) { 463 if(vfsload("nfs")) 464 err(EX_OSERR, "vfsload(nfs)"); 465 endvfsent(); /* clear cache */ 466 error = getvfsbyname("nfs", &vfc); 467 } 468 if (error) 469 errx(EX_OSERR, "nfs filesystem is not available"); 470 471 if (mount(vfc.vfc_name, mntpath, mntflags, nfsargsp)) 472 err(1, "%s", mntpath); 473 if (nfsargsp->flags & (NFSMNT_NQNFS | NFSMNT_KERB)) { 474 if ((opflags & ISBGRND) == 0) { 475 if (daemon(0, 0) != 0) 476 err(1, "daemon"); 477 } 478 openlog("mount_nfs", LOG_PID, LOG_DAEMON); 479 nfssvc_flag = NFSSVC_MNTD; 480 ncd.ncd_dirp = mntpath; 481 while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) { 482 if (errno != ENEEDAUTH) { 483 syslog(LOG_ERR, "nfssvc err %m"); 484 continue; 485 } 486 nfssvc_flag = 487 NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL; 488 #ifdef NFSKERB 489 /* 490 * Set up as ncd_authuid for the kerberos call. 491 * Must set ruid to ncd_authuid and reset the 492 * ticket name iff ncd_authuid is not the same 493 * as last time, so that the right ticket file 494 * is found. 495 * Get the Kerberos credential structure so that 496 * we have the session key and get a ticket for 497 * this uid. 498 * For more info see the IETF Draft "Authentication 499 * in ONC RPC". 500 */ 501 if (ncd.ncd_authuid != last_ruid) { 502 char buf[512]; 503 (void)sprintf(buf, "%s%d", 504 TKT_ROOT, ncd.ncd_authuid); 505 krb_set_tkt_string(buf); 506 last_ruid = ncd.ncd_authuid; 507 } 508 setreuid(ncd.ncd_authuid, 0); 509 kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr); 510 if (kret == RET_NOTKT) { 511 kret = get_ad_tkt(NFS_KERBSRV, inst, realm, 512 DEFAULT_TKT_LIFE); 513 if (kret == KSUCCESS) 514 kret = krb_get_cred(NFS_KERBSRV, inst, realm, 515 &kcr); 516 } 517 if (kret == KSUCCESS) 518 kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst, 519 realm, 0); 520 521 /* 522 * Fill in the AKN_FULLNAME authenticator and verifier. 523 * Along with the Kerberos ticket, we need to build 524 * the timestamp verifier and encrypt it in CBC mode. 525 */ 526 if (kret == KSUCCESS && 527 ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED) 528 && gettimeofday(&ktv, (struct timezone *)0) == 0) { 529 ncd.ncd_authtype = RPCAUTH_KERB4; 530 ncd.ncd_authstr = (u_char *)&ktick; 531 ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) + 532 3 * NFSX_UNSIGNED; 533 ncd.ncd_verfstr = (u_char *)&kverf; 534 ncd.ncd_verflen = sizeof (kverf); 535 memmove(ncd.ncd_key, kcr.session, 536 sizeof (kcr.session)); 537 kin.t1 = htonl(ktv.tv_sec); 538 kin.t2 = htonl(ktv.tv_usec); 539 kin.w1 = htonl(NFS_KERBTTL); 540 kin.w2 = htonl(NFS_KERBTTL - 1); 541 bzero((caddr_t)kivec, sizeof (kivec)); 542 543 /* 544 * Encrypt kin in CBC mode using the session 545 * key in kcr. 546 */ 547 XXX 548 549 /* 550 * Finally, fill the timestamp verifier into the 551 * authenticator and verifier. 552 */ 553 ktick.kind = htonl(RPCAKN_FULLNAME); 554 kverf.kind = htonl(RPCAKN_FULLNAME); 555 NFS_KERBW1(ktick.kt) = kout.w1; 556 ktick.kt.length = htonl(ktick.kt.length); 557 kverf.verf.t1 = kout.t1; 558 kverf.verf.t2 = kout.t2; 559 kverf.verf.w2 = kout.w2; 560 nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH; 561 } 562 setreuid(0, 0); 563 #endif /* NFSKERB */ 564 } 565 } 566 exit(0); 567 } 568 569 int 570 getnfsargs(char *spec, struct nfs_args *nfsargsp) 571 { 572 struct hostent *hp; 573 struct sockaddr_in saddr; 574 enum tryret ret; 575 int speclen, remoteerr; 576 char *hostp, *delimp, *errstr; 577 #ifdef NFSKERB 578 char *cp; 579 #endif 580 size_t len; 581 static char nam[MNAMELEN + 1]; 582 583 if ((delimp = strrchr(spec, ':')) != NULL) { 584 hostp = spec; 585 spec = delimp + 1; 586 } else if ((delimp = strrchr(spec, '@')) != NULL) { 587 warnx("path@server syntax is deprecated, use server:path"); 588 hostp = delimp + 1; 589 } else { 590 warnx("no <host>:<dirpath> nfs-name"); 591 return (0); 592 } 593 *delimp = '\0'; 594 595 /* 596 * If there has been a trailing slash at mounttime it seems 597 * that some mountd implementations fail to remove the mount 598 * entries from their mountlist while unmounting. 599 */ 600 for (speclen = strlen(spec); 601 speclen > 1 && spec[speclen - 1] == '/'; 602 speclen--) 603 spec[speclen - 1] = '\0'; 604 if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) { 605 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG)); 606 return (0); 607 } 608 /* Make both '@' and ':' notations equal */ 609 if (*hostp != '\0') { 610 len = strlen(hostp); 611 memmove(nam, hostp, len); 612 nam[len] = ':'; 613 memmove(nam + len + 1, spec, speclen); 614 nam[len + speclen + 1] = '\0'; 615 } 616 617 /* 618 * Handle an internet host address and reverse resolve it if 619 * doing Kerberos. 620 */ 621 bzero(&saddr, sizeof saddr); 622 saddr.sin_family = AF_INET; 623 saddr.sin_len = sizeof saddr; 624 625 if (port_no != 0) 626 saddr.sin_port = htons(port_no); 627 628 for (;;) { 629 int haserror = 0; 630 631 /* 632 * Adjust DNS timeouts so we do not linger in the foreground 633 * if we can be backgrounded. 634 */ 635 switch(opflags & (BGRND | ISBGRND)) { 636 case BGRND: 637 _res.retry = 1; 638 _res.retrans = 1; 639 break; 640 case BGRND|ISBGRND: 641 _res.retry = 3; 642 _res.retrans = 3; 643 break; 644 } 645 if (isdigit(*hostp)) { 646 if ((saddr.sin_addr.s_addr = inet_addr(hostp)) == -1) { 647 warnx("bad net address %s", hostp); 648 haserror = EAI_FAIL; 649 } 650 } else if ((hp = gethostbyname(hostp)) != NULL) { 651 memmove(&saddr.sin_addr, hp->h_addr, 652 MIN(hp->h_length, sizeof(saddr.sin_addr))); 653 } else { 654 warnx("can't get net id for host: %s", hostp); 655 opflags |= DIDWARN; 656 haserror = h_errno; 657 } 658 #ifdef NFSKERB 659 if (haserror == 0 && (nfsargsp->flags & NFSMNT_KERB)) { 660 if ((hp = gethostbyaddr((char *)&saddr.sin_addr.s_addr, 661 sizeof (u_long), AF_INET)) == NULL) { 662 warnx("can't reverse resolve net address"); 663 opflags |= DIDWARN; 664 haserror = h_errno; 665 } else { 666 memmove(&saddr.sin_addr, hp->h_addr, 667 MIN(hp->h_length, sizeof(saddr.sin_addr))); 668 strncpy(inst, hp->h_name, INST_SZ); 669 inst[INST_SZ - 1] = '\0'; 670 if (cp = strchr(inst, '.')) 671 *cp = '\0'; 672 } 673 } 674 #endif /* NFSKERB */ 675 /* 676 * If no error occured we do not have to retry again. 677 * Otherwise try to backgruond us if possible. 678 */ 679 if (haserror == 0) 680 break; 681 682 switch(opflags & (BGRND | ISBGRND)) { 683 case BGRND: 684 if (haserror != EAI_AGAIN) 685 return(0); 686 /* recoverable error */ 687 warnx("Cannot immediately mount %s:%s, backgrounding", 688 hostp, spec); 689 opflags |= DIDWARN; 690 opflags |= ISBGRND; 691 if (daemon(0, 0) != 0) 692 err(1, "daemon"); 693 break; 694 default: 695 /* 696 * Already backgrounded or cannot be backgrounded. 697 */ 698 if (haserror != EAI_AGAIN) 699 return(0); 700 break; 701 } 702 sleep(20); 703 endhostent(); 704 } 705 if (opflags & DIDWARN) { 706 opflags &= ~DIDWARN; 707 warnx("successfully resolved %s after prior failures", hostp); 708 } 709 710 ret = TRYRET_LOCALERR; 711 for (;;) { 712 remoteerr = 0; 713 ret = nfs_tryproto(nfsargsp, &saddr, hostp, spec, &errstr); 714 if (ret == TRYRET_SUCCESS) 715 break; 716 if (ret != TRYRET_LOCALERR) 717 remoteerr = 1; 718 if ((opflags & ISBGRND) == 0) 719 fprintf(stderr, "%s\n", errstr); 720 721 /* Exit if all errors were local. */ 722 if (!remoteerr) 723 exit(1); 724 725 /* 726 * If retrycnt == 0, we are to keep retrying forever. 727 * Otherwise decrement it, and exit if it hits zero. 728 */ 729 if (retrycnt != 0 && --retrycnt == 0) 730 exit(1); 731 732 if ((opflags & (BGRND | ISBGRND)) == BGRND) { 733 warnx("Cannot immediately mount %s:%s, backgrounding", 734 hostp, spec); 735 opflags |= ISBGRND; 736 opflags |= DIDWARN; 737 if (daemon(0, 0) != 0) 738 err(1, "daemon"); 739 } 740 sleep(20); 741 } 742 if (opflags & DIDWARN) { 743 opflags &= ~DIDWARN; 744 warnx("successfully mounted %s after prior failures", spec); 745 } 746 nfsargsp->hostname = nam; 747 /* Add mounted filesystem to PATH_MOUNTTAB */ 748 if (!add_mtab(hostp, spec)) 749 warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec); 750 return (1); 751 } 752 753 /* 754 * Try to set up the NFS arguments according to the address 755 * (and possibly port) specified by `sinp'. 756 * 757 * Returns TRYRET_SUCCESS if successful, or: 758 * TRYRET_TIMEOUT The server did not respond. 759 * TRYRET_REMOTEERR The server reported an error. 760 * TRYRET_LOCALERR Local failure. 761 * 762 * In all error cases, *errstr will be set to a statically-allocated string 763 * describing the error. 764 */ 765 enum tryret 766 nfs_tryproto(struct nfs_args *nfsargsp, struct sockaddr_in *sinp, char *hostp, 767 char *spec, char **errstr) 768 { 769 static char errbuf[256]; 770 struct sockaddr_in sin, tmpsin; 771 struct nfhret nfhret; 772 struct timeval try; 773 struct rpc_err rpcerr; 774 CLIENT *clp; 775 int doconnect, nfsvers, mntvers, so; 776 enum clnt_stat stat; 777 enum mountmode trymntmode; 778 779 trymntmode = mountmode; 780 errbuf[0] = '\0'; 781 *errstr = errbuf; 782 sin = tmpsin = *sinp; 783 784 tryagain: 785 if (trymntmode == V2) { 786 nfsvers = 2; 787 mntvers = 1; 788 } else { 789 nfsvers = 3; 790 mntvers = 3; 791 } 792 793 /* Check that the server (nfsd) responds on the port we have chosen. */ 794 try.tv_sec = 10; 795 try.tv_usec = 0; 796 so = RPC_ANYSOCK; 797 if (nfsargsp->sotype == SOCK_STREAM) 798 clp = clnttcp_create(&sin, RPCPROG_NFS, nfsvers, &so, 0, 0); 799 else 800 clp = clntudp_create(&sin, RPCPROG_NFS, nfsvers, try, &so); 801 if (clp == NULL) { 802 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 803 hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS")); 804 return (returncode(rpc_createerr.cf_stat, 805 &rpc_createerr.cf_error)); 806 } 807 if (nfsargsp->sotype == SOCK_DGRAM && 808 !(nfsargsp->flags & NFSMNT_NOCONN)) { 809 /* 810 * Use connect(), to match what the kernel does. This 811 * catches cases where the server responds from the 812 * wrong source address. 813 */ 814 doconnect = 1; 815 if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) { 816 clnt_destroy(clp); 817 snprintf(errbuf, sizeof errbuf, 818 "%s:%s: CLSET_CONNECT failed", hostp, spec); 819 return (TRYRET_LOCALERR); 820 } 821 } 822 823 try.tv_sec = 10; 824 try.tv_usec = 0; 825 stat = clnt_call(clp, NFSPROC_NULL, xdr_void, NULL, xdr_void, NULL, 826 try); 827 if (stat != RPC_SUCCESS) { 828 if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) { 829 clnt_destroy(clp); 830 trymntmode = V2; 831 goto tryagain; 832 } 833 clnt_geterr(clp, &rpcerr); 834 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 835 hostp, spec, clnt_sperror(clp, "NFSPROC_NULL")); 836 clnt_destroy(clp); 837 return (returncode(stat, &rpcerr)); 838 } 839 clnt_destroy(clp); 840 841 /* Send the RPCMNT_MOUNT RPC to get the root filehandle. */ 842 tmpsin.sin_port = 0; 843 try.tv_sec = 10; 844 try.tv_usec = 0; 845 so = RPC_ANYSOCK; 846 if (mnttcp_ok && nfsargsp->sotype == SOCK_STREAM) 847 clp = clnttcp_create(&tmpsin, RPCPROG_MNT, mntvers, &so, 0, 0); 848 else 849 clp = clntudp_create(&tmpsin, RPCPROG_MNT, mntvers, try, &so); 850 if (clp == NULL) { 851 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 852 hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create")); 853 return (returncode(rpc_createerr.cf_stat, 854 &rpc_createerr.cf_error)); 855 } 856 clp->cl_auth = authunix_create_default(); 857 if (nfsargsp->flags & NFSMNT_KERB) 858 nfhret.auth = RPCAUTH_KERB4; 859 else 860 nfhret.auth = RPCAUTH_UNIX; 861 nfhret.vers = mntvers; 862 stat = clnt_call(clp, RPCMNT_MOUNT, xdr_dir, spec, xdr_fh, &nfhret, 863 try); 864 auth_destroy(clp->cl_auth); 865 if (stat != RPC_SUCCESS) { 866 if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) { 867 clnt_destroy(clp); 868 trymntmode = V2; 869 goto tryagain; 870 } 871 clnt_geterr(clp, &rpcerr); 872 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 873 hostp, spec, clnt_sperror(clp, "RPCPROG_MNT")); 874 clnt_destroy(clp); 875 return (returncode(stat, &rpcerr)); 876 } 877 clnt_destroy(clp); 878 879 if (nfhret.stat != 0) { 880 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 881 hostp, spec, strerror(nfhret.stat)); 882 return (TRYRET_REMOTEERR); 883 } 884 885 /* 886 * Store the filehandle and server address in nfsargsp, making 887 * sure to copy any locally allocated structures. 888 */ 889 nfsargsp->addrlen = sin.sin_len; 890 nfsargsp->addr = malloc(nfsargsp->addrlen); 891 nfsargsp->fhsize = nfhret.fhsize; 892 nfsargsp->fh = malloc(nfsargsp->fhsize); 893 if (nfsargsp->addr == NULL || nfsargsp->fh == NULL) 894 err(1, "malloc"); 895 bcopy(&sin, nfsargsp->addr, nfsargsp->addrlen); 896 bcopy(nfhret.nfh, nfsargsp->fh, nfsargsp->fhsize); 897 898 if (nfsvers == 3) 899 nfsargsp->flags |= NFSMNT_NFSV3; 900 else 901 nfsargsp->flags &= ~NFSMNT_NFSV3; 902 903 return (TRYRET_SUCCESS); 904 } 905 906 /* 907 * Catagorise a RPC return status and error into an `enum tryret' 908 * return code. 909 */ 910 enum tryret 911 returncode(enum clnt_stat stat, struct rpc_err *rpcerr) 912 { 913 switch (stat) { 914 case RPC_TIMEDOUT: 915 return (TRYRET_TIMEOUT); 916 case RPC_PMAPFAILURE: 917 case RPC_PROGNOTREGISTERED: 918 case RPC_PROGVERSMISMATCH: 919 /* XXX, these can be local or remote. */ 920 case RPC_CANTSEND: 921 case RPC_CANTRECV: 922 return (TRYRET_REMOTEERR); 923 case RPC_SYSTEMERROR: 924 switch (rpcerr->re_errno) { 925 case ETIMEDOUT: 926 return (TRYRET_TIMEOUT); 927 case ENOMEM: 928 break; 929 default: 930 return (TRYRET_REMOTEERR); 931 } 932 /* FALLTHROUGH */ 933 default: 934 break; 935 } 936 return (TRYRET_LOCALERR); 937 } 938 939 /* 940 * xdr routines for mount rpc's 941 */ 942 int 943 xdr_dir(XDR *xdrsp, char *dirp) 944 { 945 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 946 } 947 948 int 949 xdr_fh(XDR *xdrsp, register struct nfhret *np) 950 { 951 register int i; 952 long auth, authcnt, authfnd = 0; 953 954 if (!xdr_u_long(xdrsp, &np->stat)) 955 return (0); 956 if (np->stat) 957 return (1); 958 switch (np->vers) { 959 case 1: 960 np->fhsize = NFSX_V2FH; 961 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH)); 962 case 3: 963 if (!xdr_long(xdrsp, &np->fhsize)) 964 return (0); 965 if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX) 966 return (0); 967 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize)) 968 return (0); 969 if (!xdr_long(xdrsp, &authcnt)) 970 return (0); 971 for (i = 0; i < authcnt; i++) { 972 if (!xdr_long(xdrsp, &auth)) 973 return (0); 974 if (auth == np->auth) 975 authfnd++; 976 } 977 /* 978 * Some servers, such as DEC's OSF/1 return a nil authenticator 979 * list to indicate RPCAUTH_UNIX. 980 */ 981 if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX)) 982 np->stat = EAUTH; 983 return (1); 984 }; 985 return (0); 986 } 987 988 void 989 usage(void) 990 { 991 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n", 992 "usage: mount_nfs [-23KNPTUbcdilqs] [-D deadthresh] [-I readdirsize]", 993 " [-L leaseterm] [-R retrycnt] [-a maxreadahead]", 994 " [-g maxgroups] [-m realm] [-o options] [-r readsize]", 995 " [-t timeout] [-w writesize] [-x retrans] rhost:path node"); 996 exit(1); 997 } 998