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 1.11 2005/11/06 12:34:21 swildner 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 MOPT_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 void set_rpc_maxgrouplist(int); 193 194 static int getnfsargs(char *, struct nfs_args *); 195 static void usage(void) __dead2; 196 static int xdr_dir(XDR *, char *); 197 static int xdr_fh(XDR *, struct nfhret *); 198 static enum tryret 199 nfs_tryproto(struct nfs_args *, struct sockaddr_in *, 200 char *, char *, char **); 201 static enum tryret 202 returncode(enum clnt_stat, struct rpc_err *); 203 204 /* 205 * Used to set mount flags with getmntopts. Call with dir=TRUE to 206 * initialize altflags from the current mount flags. Call with 207 * dir=FALSE to update mount flags with the new value of altflags after 208 * the call to getmntopts. 209 */ 210 static void 211 set_flags(int* altflags, int* nfsflags, int dir) 212 { 213 #define F2(af, nf) \ 214 if (dir) { \ 215 if (*nfsflags & NFSMNT_##nf) \ 216 *altflags |= ALTF_##af; \ 217 else \ 218 *altflags &= ~ALTF_##af; \ 219 } else { \ 220 if (*altflags & ALTF_##af) \ 221 *nfsflags |= NFSMNT_##nf; \ 222 else \ 223 *nfsflags &= ~NFSMNT_##nf; \ 224 } 225 #define F(f) F2(f,f) 226 227 F(NOCONN); 228 F(DUMBTIMR); 229 F2(INTR, INT); 230 #ifdef NFSKERB 231 F(KERB); 232 #endif 233 F(RDIRPLUS); 234 F(RESVPORT); 235 F(NQNFS); 236 F(SOFT); 237 F(ACREGMIN); 238 F(ACREGMAX); 239 F(ACDIRMIN); 240 F(ACDIRMAX); 241 242 #undef F 243 #undef F2 244 } 245 246 int 247 main(int argc, char **argv) 248 { 249 int c; 250 struct nfs_args *nfsargsp; 251 struct nfs_args nfsargs; 252 struct nfsd_cargs ncd; 253 int mntflags, altflags, nfssvc_flag, num; 254 char *name, *p, *spec; 255 char mntpath[MAXPATHLEN]; 256 struct vfsconf vfc; 257 int error = 0; 258 #ifdef NFSKERB 259 uid_t last_ruid; 260 261 last_ruid = -1; 262 strcpy(realm, KRB_REALM); 263 if (sizeof (struct nfsrpc_nickverf) != RPCX_NICKVERF || 264 sizeof (struct nfsrpc_fullblock) != RPCX_FULLBLOCK || 265 ((char *)&ktick.kt) - ((char *)&ktick) != NFSX_UNSIGNED || 266 ((char *)ktick.kt.dat) - ((char *)&ktick) != 2 * NFSX_UNSIGNED) 267 fprintf(stderr, "Yikes! NFSKERB structs not packed!!\n"); 268 #endif /* NFSKERB */ 269 270 mntflags = 0; 271 altflags = 0; 272 nfsargs = nfsdefargs; 273 nfsargsp = &nfsargs; 274 while ((c = getopt(argc, argv, 275 "23a:bcdD:g:I:iKL:lm:No:PqR:r:sTt:w:x:U")) != -1) 276 switch (c) { 277 case '2': 278 mountmode = V2; 279 break; 280 case '3': 281 mountmode = V3; 282 break; 283 case 'a': 284 num = strtol(optarg, &p, 10); 285 if (*p || num < 0) 286 errx(1, "illegal -a value -- %s", optarg); 287 nfsargsp->readahead = num; 288 nfsargsp->flags |= NFSMNT_READAHEAD; 289 break; 290 case 'b': 291 opflags |= BGRND; 292 break; 293 case 'c': 294 nfsargsp->flags |= NFSMNT_NOCONN; 295 break; 296 case 'D': 297 num = strtol(optarg, &p, 10); 298 if (*p || num <= 0) 299 errx(1, "illegal -D value -- %s", optarg); 300 nfsargsp->deadthresh = num; 301 nfsargsp->flags |= NFSMNT_DEADTHRESH; 302 break; 303 case 'd': 304 nfsargsp->flags |= NFSMNT_DUMBTIMR; 305 break; 306 case 'g': 307 num = strtol(optarg, &p, 10); 308 if (*p || num <= 0) 309 errx(1, "illegal -g value -- %s", optarg); 310 set_rpc_maxgrouplist(num); 311 nfsargsp->maxgrouplist = num; 312 nfsargsp->flags |= NFSMNT_MAXGRPS; 313 break; 314 case 'I': 315 num = strtol(optarg, &p, 10); 316 if (*p || num <= 0) 317 errx(1, "illegal -I value -- %s", optarg); 318 nfsargsp->readdirsize = num; 319 nfsargsp->flags |= NFSMNT_READDIRSIZE; 320 break; 321 case 'i': 322 nfsargsp->flags |= NFSMNT_INT; 323 break; 324 #ifdef NFSKERB 325 case 'K': 326 nfsargsp->flags |= NFSMNT_KERB; 327 break; 328 #endif 329 case 'L': 330 num = strtol(optarg, &p, 10); 331 if (*p || num < 2) 332 errx(1, "illegal -L value -- %s", optarg); 333 nfsargsp->leaseterm = num; 334 nfsargsp->flags |= NFSMNT_LEASETERM; 335 break; 336 case 'l': 337 nfsargsp->flags |= NFSMNT_RDIRPLUS; 338 break; 339 #ifdef NFSKERB 340 case 'm': 341 strncpy(realm, optarg, REALM_SZ - 1); 342 realm[REALM_SZ - 1] = '\0'; 343 break; 344 #endif 345 case 'N': 346 nfsargsp->flags &= ~NFSMNT_RESVPORT; 347 break; 348 case 'o': 349 altflags = 0; 350 set_flags(&altflags, &nfsargsp->flags, TRUE); 351 if (mountmode == V2) 352 altflags |= ALTF_NFSV2; 353 else if (mountmode == V3) 354 altflags |= ALTF_NFSV3; 355 getmntopts(optarg, mopts, &mntflags, &altflags); 356 set_flags(&altflags, &nfsargsp->flags, FALSE); 357 /* 358 * Handle altflags which don't map directly to 359 * mount flags. 360 */ 361 if(altflags & ALTF_BG) 362 opflags |= BGRND; 363 if(altflags & ALTF_MNTUDP) 364 mnttcp_ok = 0; 365 if(altflags & ALTF_TCP) { 366 nfsargsp->sotype = SOCK_STREAM; 367 nfsproto = IPPROTO_TCP; 368 } 369 if(altflags & ALTF_PORT) 370 port_no = atoi(strstr(optarg, "port=") + 5); 371 mountmode = ANY; 372 if(altflags & ALTF_NFSV2) 373 mountmode = V2; 374 if(altflags & ALTF_NFSV3) 375 mountmode = V3; 376 if(altflags & ALTF_ACREGMIN) 377 nfsargsp->acregmin = atoi(strstr(optarg, 378 "acregmin=") + 9); 379 if(altflags & ALTF_ACREGMAX) 380 nfsargsp->acregmax = atoi(strstr(optarg, 381 "acregmax=") + 9); 382 if(altflags & ALTF_ACDIRMIN) 383 nfsargsp->acdirmin = atoi(strstr(optarg, 384 "acdirmin=") + 9); 385 if(altflags & ALTF_ACDIRMAX) 386 nfsargsp->acdirmax = atoi(strstr(optarg, 387 "acdirmax=") + 9); 388 break; 389 case 'P': 390 /* obsolete for NFSMNT_RESVPORT, now default */ 391 break; 392 case 'q': 393 mountmode = V3; 394 nfsargsp->flags |= NFSMNT_NQNFS; 395 break; 396 case 'R': 397 num = strtol(optarg, &p, 10); 398 if (*p || num < 0) 399 errx(1, "illegal -R value -- %s", optarg); 400 retrycnt = num; 401 break; 402 case 'r': 403 num = strtol(optarg, &p, 10); 404 if (*p || num <= 0) 405 errx(1, "illegal -r value -- %s", optarg); 406 nfsargsp->rsize = num; 407 nfsargsp->flags |= NFSMNT_RSIZE; 408 break; 409 case 's': 410 nfsargsp->flags |= NFSMNT_SOFT; 411 break; 412 case 'T': 413 nfsargsp->sotype = SOCK_STREAM; 414 nfsproto = IPPROTO_TCP; 415 break; 416 case 't': 417 num = strtol(optarg, &p, 10); 418 if (*p || num <= 0) 419 errx(1, "illegal -t value -- %s", optarg); 420 nfsargsp->timeo = num; 421 nfsargsp->flags |= NFSMNT_TIMEO; 422 break; 423 case 'w': 424 num = strtol(optarg, &p, 10); 425 if (*p || num <= 0) 426 errx(1, "illegal -w value -- %s", optarg); 427 nfsargsp->wsize = num; 428 nfsargsp->flags |= NFSMNT_WSIZE; 429 break; 430 case 'x': 431 num = strtol(optarg, &p, 10); 432 if (*p || num <= 0) 433 errx(1, "illegal -x value -- %s", optarg); 434 nfsargsp->retrans = num; 435 nfsargsp->flags |= NFSMNT_RETRANS; 436 break; 437 case 'U': 438 mnttcp_ok = 0; 439 break; 440 default: 441 usage(); 442 break; 443 } 444 argc -= optind; 445 argv += optind; 446 447 if (argc != 2) { 448 usage(); 449 /* NOTREACHED */ 450 } 451 452 spec = *argv++; 453 name = *argv; 454 455 if (retrycnt == -1) 456 /* The default is to keep retrying forever. */ 457 retrycnt = 0; 458 if (!getnfsargs(spec, nfsargsp)) 459 exit(1); 460 461 /* resolve the mountpoint with realpath(3) */ 462 checkpath(name, mntpath); 463 464 error = getvfsbyname("nfs", &vfc); 465 if (error && vfsisloadable("nfs")) { 466 if(vfsload("nfs")) 467 err(EX_OSERR, "vfsload(nfs)"); 468 endvfsent(); /* clear cache */ 469 error = getvfsbyname("nfs", &vfc); 470 } 471 if (error) 472 errx(EX_OSERR, "nfs filesystem is not available"); 473 474 if (mount(vfc.vfc_name, mntpath, mntflags, nfsargsp)) 475 err(1, "%s", mntpath); 476 if (nfsargsp->flags & (NFSMNT_NQNFS | NFSMNT_KERB)) { 477 if ((opflags & ISBGRND) == 0) { 478 if (daemon(0, 0) != 0) 479 err(1, "daemon"); 480 } 481 openlog("mount_nfs", LOG_PID, LOG_DAEMON); 482 nfssvc_flag = NFSSVC_MNTD; 483 ncd.ncd_dirp = mntpath; 484 while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) { 485 if (errno != ENEEDAUTH) { 486 syslog(LOG_ERR, "nfssvc err %m"); 487 continue; 488 } 489 nfssvc_flag = 490 NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL; 491 #ifdef NFSKERB 492 /* 493 * Set up as ncd_authuid for the kerberos call. 494 * Must set ruid to ncd_authuid and reset the 495 * ticket name iff ncd_authuid is not the same 496 * as last time, so that the right ticket file 497 * is found. 498 * Get the Kerberos credential structure so that 499 * we have the session key and get a ticket for 500 * this uid. 501 * For more info see the IETF Draft "Authentication 502 * in ONC RPC". 503 */ 504 if (ncd.ncd_authuid != last_ruid) { 505 char buf[512]; 506 sprintf(buf, "%s%d", TKT_ROOT, ncd.ncd_authuid); 507 krb_set_tkt_string(buf); 508 last_ruid = ncd.ncd_authuid; 509 } 510 setreuid(ncd.ncd_authuid, 0); 511 kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr); 512 if (kret == RET_NOTKT) { 513 kret = get_ad_tkt(NFS_KERBSRV, inst, realm, 514 DEFAULT_TKT_LIFE); 515 if (kret == KSUCCESS) 516 kret = krb_get_cred(NFS_KERBSRV, inst, realm, 517 &kcr); 518 } 519 if (kret == KSUCCESS) 520 kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst, 521 realm, 0); 522 523 /* 524 * Fill in the AKN_FULLNAME authenticator and verifier. 525 * Along with the Kerberos ticket, we need to build 526 * the timestamp verifier and encrypt it in CBC mode. 527 */ 528 if (kret == KSUCCESS && 529 ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED) 530 && gettimeofday(&ktv, (struct timezone *)0) == 0) { 531 ncd.ncd_authtype = RPCAUTH_KERB4; 532 ncd.ncd_authstr = (u_char *)&ktick; 533 ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) + 534 3 * NFSX_UNSIGNED; 535 ncd.ncd_verfstr = (u_char *)&kverf; 536 ncd.ncd_verflen = sizeof (kverf); 537 memmove(ncd.ncd_key, kcr.session, 538 sizeof (kcr.session)); 539 kin.t1 = htonl(ktv.tv_sec); 540 kin.t2 = htonl(ktv.tv_usec); 541 kin.w1 = htonl(NFS_KERBTTL); 542 kin.w2 = htonl(NFS_KERBTTL - 1); 543 bzero((caddr_t)kivec, sizeof (kivec)); 544 545 /* 546 * Encrypt kin in CBC mode using the session 547 * key in kcr. 548 */ 549 XXX 550 551 /* 552 * Finally, fill the timestamp verifier into the 553 * authenticator and verifier. 554 */ 555 ktick.kind = htonl(RPCAKN_FULLNAME); 556 kverf.kind = htonl(RPCAKN_FULLNAME); 557 NFS_KERBW1(ktick.kt) = kout.w1; 558 ktick.kt.length = htonl(ktick.kt.length); 559 kverf.verf.t1 = kout.t1; 560 kverf.verf.t2 = kout.t2; 561 kverf.verf.w2 = kout.w2; 562 nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH; 563 } 564 setreuid(0, 0); 565 #endif /* NFSKERB */ 566 } 567 } 568 exit(0); 569 } 570 571 static int 572 getnfsargs(char *spec, struct nfs_args *nfsargsp) 573 { 574 struct hostent *hp; 575 struct sockaddr_in saddr; 576 enum tryret ret; 577 int speclen, remoteerr; 578 char *hostp, *delimp, *errstr; 579 #ifdef NFSKERB 580 char *cp; 581 #endif 582 size_t len; 583 static char nam[MNAMELEN + 1]; 584 585 if ((delimp = strrchr(spec, ':')) != NULL) { 586 hostp = spec; 587 spec = delimp + 1; 588 } else if ((delimp = strrchr(spec, '@')) != NULL) { 589 warnx("path@server syntax is deprecated, use server:path"); 590 hostp = delimp + 1; 591 } else { 592 warnx("no <host>:<dirpath> nfs-name"); 593 return (0); 594 } 595 *delimp = '\0'; 596 597 /* 598 * If there has been a trailing slash at mounttime it seems 599 * that some mountd implementations fail to remove the mount 600 * entries from their mountlist while unmounting. 601 */ 602 for (speclen = strlen(spec); 603 speclen > 1 && spec[speclen - 1] == '/'; 604 speclen--) 605 spec[speclen - 1] = '\0'; 606 if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) { 607 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG)); 608 return (0); 609 } 610 /* Make both '@' and ':' notations equal */ 611 if (*hostp != '\0') { 612 len = strlen(hostp); 613 memmove(nam, hostp, len); 614 nam[len] = ':'; 615 memmove(nam + len + 1, spec, speclen); 616 nam[len + speclen + 1] = '\0'; 617 } 618 619 /* 620 * Handle an internet host address and reverse resolve it if 621 * doing Kerberos. 622 */ 623 bzero(&saddr, sizeof saddr); 624 saddr.sin_family = AF_INET; 625 saddr.sin_len = sizeof saddr; 626 627 if (port_no != 0) 628 saddr.sin_port = htons(port_no); 629 630 for (;;) { 631 int haserror = 0; 632 633 /* 634 * Adjust DNS timeouts so we do not linger in the foreground 635 * if we can be backgrounded. 636 */ 637 switch(opflags & (BGRND | ISBGRND)) { 638 case BGRND: 639 _res.retry = 1; 640 _res.retrans = 1; 641 break; 642 case BGRND|ISBGRND: 643 _res.retry = 3; 644 _res.retrans = 3; 645 break; 646 } 647 if (isdigit(*hostp)) { 648 saddr.sin_addr.s_addr = inet_addr(hostp); 649 if (saddr.sin_addr.s_addr == INADDR_NONE) { 650 warnx("bad net address %s", hostp); 651 haserror = EAI_FAIL; 652 } 653 } else if ((hp = gethostbyname(hostp)) != NULL) { 654 memmove(&saddr.sin_addr, hp->h_addr, 655 MIN(hp->h_length, (int)sizeof(saddr.sin_addr))); 656 } else { 657 warnx("can't get net id for host: %s", hostp); 658 opflags |= DIDWARN; 659 haserror = h_errno; 660 } 661 #ifdef NFSKERB 662 if (haserror == 0 && (nfsargsp->flags & NFSMNT_KERB)) { 663 if ((hp = gethostbyaddr((char *)&saddr.sin_addr.s_addr, 664 sizeof (u_long), AF_INET)) == NULL) { 665 warnx("can't reverse resolve net address"); 666 opflags |= DIDWARN; 667 haserror = h_errno; 668 } else { 669 memmove(&saddr.sin_addr, hp->h_addr, 670 MIN(hp->h_length, sizeof(saddr.sin_addr))); 671 strncpy(inst, hp->h_name, INST_SZ); 672 inst[INST_SZ - 1] = '\0'; 673 if (cp = strchr(inst, '.')) 674 *cp = '\0'; 675 } 676 } 677 #endif /* NFSKERB */ 678 /* 679 * If no error occured we do not have to retry again. 680 * Otherwise try to backgruond us if possible. 681 */ 682 if (haserror == 0) 683 break; 684 685 switch(opflags & (BGRND | ISBGRND)) { 686 case BGRND: 687 if (haserror != EAI_AGAIN) 688 return(0); 689 /* recoverable error */ 690 warnx("Cannot immediately mount %s:%s, backgrounding", 691 hostp, spec); 692 opflags |= DIDWARN; 693 opflags |= ISBGRND; 694 if (daemon(0, 0) != 0) 695 err(1, "daemon"); 696 break; 697 default: 698 /* 699 * Already backgrounded or cannot be backgrounded. 700 */ 701 if (haserror != EAI_AGAIN) 702 return(0); 703 break; 704 } 705 sleep(20); 706 endhostent(); 707 } 708 if (opflags & DIDWARN) { 709 opflags &= ~DIDWARN; 710 warnx("successfully resolved %s after prior failures", hostp); 711 } 712 713 ret = TRYRET_LOCALERR; 714 for (;;) { 715 remoteerr = 0; 716 ret = nfs_tryproto(nfsargsp, &saddr, hostp, spec, &errstr); 717 if (ret == TRYRET_SUCCESS) 718 break; 719 if (ret != TRYRET_LOCALERR) 720 remoteerr = 1; 721 if ((opflags & ISBGRND) == 0) 722 fprintf(stderr, "%s\n", errstr); 723 724 /* Exit if all errors were local. */ 725 if (!remoteerr) 726 exit(1); 727 728 /* 729 * If retrycnt == 0, we are to keep retrying forever. 730 * Otherwise decrement it, and exit if it hits zero. 731 */ 732 if (retrycnt != 0 && --retrycnt == 0) 733 exit(1); 734 735 if ((opflags & (BGRND | ISBGRND)) == BGRND) { 736 warnx("Cannot immediately mount %s:%s, backgrounding", 737 hostp, spec); 738 opflags |= ISBGRND; 739 opflags |= DIDWARN; 740 if (daemon(0, 0) != 0) 741 err(1, "daemon"); 742 } 743 sleep(20); 744 } 745 if (opflags & DIDWARN) { 746 opflags &= ~DIDWARN; 747 warnx("successfully mounted %s after prior failures", spec); 748 } 749 nfsargsp->hostname = nam; 750 /* Add mounted filesystem to PATH_MOUNTTAB */ 751 if (!add_mtab(hostp, spec)) 752 warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec); 753 return (1); 754 } 755 756 /* 757 * Try to set up the NFS arguments according to the address 758 * (and possibly port) specified by `sinp'. 759 * 760 * Returns TRYRET_SUCCESS if successful, or: 761 * TRYRET_TIMEOUT The server did not respond. 762 * TRYRET_REMOTEERR The server reported an error. 763 * TRYRET_LOCALERR Local failure. 764 * 765 * In all error cases, *errstr will be set to a statically-allocated string 766 * describing the error. 767 */ 768 static enum tryret 769 nfs_tryproto(struct nfs_args *nfsargsp, struct sockaddr_in *sinp, char *hostp, 770 char *spec, char **errstr) 771 { 772 static char errbuf[256]; 773 struct sockaddr_in sin, tmpsin; 774 struct nfhret nfhret; 775 struct timeval try; 776 struct rpc_err rpcerr; 777 CLIENT *clp; 778 int doconnect, nfsvers, mntvers, so; 779 enum clnt_stat status; 780 enum mountmode trymntmode; 781 782 trymntmode = mountmode; 783 errbuf[0] = '\0'; 784 *errstr = errbuf; 785 sin = tmpsin = *sinp; 786 787 tryagain: 788 if (trymntmode == V2) { 789 nfsvers = 2; 790 mntvers = 1; 791 } else { 792 nfsvers = 3; 793 mntvers = 3; 794 } 795 796 /* Check that the server (nfsd) responds on the port we have chosen. */ 797 try.tv_sec = 10; 798 try.tv_usec = 0; 799 so = RPC_ANYSOCK; 800 if (nfsargsp->sotype == SOCK_STREAM) 801 clp = clnttcp_create(&sin, RPCPROG_NFS, nfsvers, &so, 0, 0); 802 else 803 clp = clntudp_create(&sin, RPCPROG_NFS, nfsvers, try, &so); 804 if (clp == NULL) { 805 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 806 hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS")); 807 return (returncode(rpc_createerr.cf_stat, 808 &rpc_createerr.cf_error)); 809 } 810 if (nfsargsp->sotype == SOCK_DGRAM && 811 !(nfsargsp->flags & NFSMNT_NOCONN)) { 812 /* 813 * Use connect(), to match what the kernel does. This 814 * catches cases where the server responds from the 815 * wrong source address. 816 */ 817 doconnect = 1; 818 if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) { 819 clnt_destroy(clp); 820 snprintf(errbuf, sizeof errbuf, 821 "%s:%s: CLSET_CONNECT failed", hostp, spec); 822 return (TRYRET_LOCALERR); 823 } 824 } 825 826 try.tv_sec = 10; 827 try.tv_usec = 0; 828 status = clnt_call(clp, NFSPROC_NULL, xdr_void, NULL, xdr_void, NULL, 829 try); 830 if (status != RPC_SUCCESS) { 831 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) { 832 clnt_destroy(clp); 833 trymntmode = V2; 834 goto tryagain; 835 } 836 clnt_geterr(clp, &rpcerr); 837 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 838 hostp, spec, clnt_sperror(clp, "NFSPROC_NULL")); 839 clnt_destroy(clp); 840 return (returncode(status, &rpcerr)); 841 } 842 clnt_destroy(clp); 843 844 /* Send the RPCMNT_MOUNT RPC to get the root filehandle. */ 845 tmpsin.sin_port = 0; 846 try.tv_sec = 10; 847 try.tv_usec = 0; 848 so = RPC_ANYSOCK; 849 if (mnttcp_ok && nfsargsp->sotype == SOCK_STREAM) 850 clp = clnttcp_create(&tmpsin, RPCPROG_MNT, mntvers, &so, 0, 0); 851 else 852 clp = clntudp_create(&tmpsin, RPCPROG_MNT, mntvers, try, &so); 853 if (clp == NULL) { 854 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 855 hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create")); 856 return (returncode(rpc_createerr.cf_stat, 857 &rpc_createerr.cf_error)); 858 } 859 clp->cl_auth = authunix_create_default(); 860 if (nfsargsp->flags & NFSMNT_KERB) 861 nfhret.auth = RPCAUTH_KERB4; 862 else 863 nfhret.auth = RPCAUTH_UNIX; 864 nfhret.vers = mntvers; 865 status = clnt_call(clp, RPCMNT_MOUNT, xdr_dir, spec, xdr_fh, &nfhret, 866 try); 867 auth_destroy(clp->cl_auth); 868 if (status != RPC_SUCCESS) { 869 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) { 870 clnt_destroy(clp); 871 trymntmode = V2; 872 goto tryagain; 873 } 874 clnt_geterr(clp, &rpcerr); 875 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 876 hostp, spec, clnt_sperror(clp, "RPCPROG_MNT")); 877 clnt_destroy(clp); 878 return (returncode(status, &rpcerr)); 879 } 880 clnt_destroy(clp); 881 882 if (nfhret.stat != 0) { 883 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 884 hostp, spec, strerror(nfhret.stat)); 885 return (TRYRET_REMOTEERR); 886 } 887 888 /* 889 * Store the filehandle and server address in nfsargsp, making 890 * sure to copy any locally allocated structures. 891 */ 892 nfsargsp->addrlen = sin.sin_len; 893 nfsargsp->addr = malloc(nfsargsp->addrlen); 894 nfsargsp->fhsize = nfhret.fhsize; 895 nfsargsp->fh = malloc(nfsargsp->fhsize); 896 if (nfsargsp->addr == NULL || nfsargsp->fh == NULL) 897 err(1, "malloc"); 898 bcopy(&sin, nfsargsp->addr, nfsargsp->addrlen); 899 bcopy(nfhret.nfh, nfsargsp->fh, nfsargsp->fhsize); 900 901 if (nfsvers == 3) 902 nfsargsp->flags |= NFSMNT_NFSV3; 903 else 904 nfsargsp->flags &= ~NFSMNT_NFSV3; 905 906 return (TRYRET_SUCCESS); 907 } 908 909 /* 910 * Catagorise a RPC return status and error into an `enum tryret' 911 * return code. 912 */ 913 static enum tryret 914 returncode(enum clnt_stat status, struct rpc_err *rpcerr) 915 { 916 switch (status) { 917 case RPC_TIMEDOUT: 918 return (TRYRET_TIMEOUT); 919 case RPC_PMAPFAILURE: 920 case RPC_PROGNOTREGISTERED: 921 case RPC_PROGVERSMISMATCH: 922 /* XXX, these can be local or remote. */ 923 case RPC_CANTSEND: 924 case RPC_CANTRECV: 925 return (TRYRET_REMOTEERR); 926 case RPC_SYSTEMERROR: 927 switch (rpcerr->re_errno) { 928 case ETIMEDOUT: 929 return (TRYRET_TIMEOUT); 930 case ENOMEM: 931 break; 932 default: 933 return (TRYRET_REMOTEERR); 934 } 935 /* FALLTHROUGH */ 936 default: 937 break; 938 } 939 return (TRYRET_LOCALERR); 940 } 941 942 /* 943 * xdr routines for mount rpc's 944 */ 945 static int 946 xdr_dir(XDR *xdrsp, char *dirp) 947 { 948 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 949 } 950 951 static int 952 xdr_fh(XDR *xdrsp, struct nfhret *np) 953 { 954 int i; 955 long auth, authcnt, authfnd = 0; 956 957 if (!xdr_u_long(xdrsp, &np->stat)) 958 return (0); 959 if (np->stat) 960 return (1); 961 switch (np->vers) { 962 case 1: 963 np->fhsize = NFSX_V2FH; 964 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH)); 965 case 3: 966 if (!xdr_long(xdrsp, &np->fhsize)) 967 return (0); 968 if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX) 969 return (0); 970 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize)) 971 return (0); 972 if (!xdr_long(xdrsp, &authcnt)) 973 return (0); 974 for (i = 0; i < authcnt; i++) { 975 if (!xdr_long(xdrsp, &auth)) 976 return (0); 977 if (auth == np->auth) 978 authfnd++; 979 } 980 /* 981 * Some servers, such as DEC's OSF/1 return a nil authenticator 982 * list to indicate RPCAUTH_UNIX. 983 */ 984 if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX)) 985 np->stat = EAUTH; 986 return (1); 987 }; 988 return (0); 989 } 990 991 static void 992 usage(void) 993 { 994 fprintf(stderr, "%s\n%s\n%s\n%s\n", 995 "usage: mount_nfs [-23KNPTUbcdilqs] [-D deadthresh] [-I readdirsize]", 996 " [-L leaseterm] [-R retrycnt] [-a maxreadahead]", 997 " [-g maxgroups] [-m realm] [-o options] [-r readsize]", 998 " [-t timeout] [-w writesize] [-x retrans] rhost:path node"); 999 exit(1); 1000 } 1001