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 1.14 2008/07/14 22:22:40 dillon 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 55 #include <arpa/inet.h> 56 57 #include <ctype.h> 58 #include <err.h> 59 #include <errno.h> 60 #include <netdb.h> 61 #include <stdio.h> 62 #include <stdlib.h> 63 #include <strings.h> 64 #include <sysexits.h> 65 #include <unistd.h> 66 #include <resolv.h> 67 68 #include "mntopts.h" 69 #include "mounttab.h" 70 71 #define ALTF_BG 0x1 72 #define ALTF_NOCONN 0x2 73 #define ALTF_DUMBTIMR 0x4 74 #define ALTF_INTR 0x8 75 #define ALTF_KERB 0x10 76 #define ALTF_NFSV3 0x20 77 #define ALTF_RDIRPLUS 0x40 78 #define ALTF_MNTUDP 0x80 79 #define ALTF_RESVPORT 0x100 80 #define ALTF_SEQPACKET 0x200 81 #define ALTF_UNUSED400 0x400 82 #define ALTF_SOFT 0x800 83 #define ALTF_TCP 0x1000 84 #define ALTF_PORT 0x2000 85 #define ALTF_NFSV2 0x4000 86 #define ALTF_ACREGMIN 0x8000 87 #define ALTF_ACREGMAX 0x10000 88 #define ALTF_ACDIRMIN 0x20000 89 #define ALTF_ACDIRMAX 0x40000 90 91 struct mntopt mopts[] = { 92 MOPT_STDOPTS, 93 MOPT_FORCE, 94 MOPT_UPDATE, 95 MOPT_ASYNC, 96 { "bg", 0, ALTF_BG, 1 }, 97 { "conn", 1, ALTF_NOCONN, 1 }, 98 { "dumbtimer", 0, ALTF_DUMBTIMR, 1 }, 99 { "intr", 0, ALTF_INTR, 1 }, 100 #ifdef NFSKERB 101 { "kerb", 0, ALTF_KERB, 1 }, 102 #endif 103 { "nfsv3", 0, ALTF_NFSV3, 1 }, 104 { "rdirplus", 0, ALTF_RDIRPLUS, 1 }, 105 { "mntudp", 0, ALTF_MNTUDP, 1 }, 106 { "resvport", 0, ALTF_RESVPORT, 1 }, 107 { "soft", 0, ALTF_SOFT, 1 }, 108 { "tcp", 0, ALTF_TCP, 1 }, 109 { "port=", 0, ALTF_PORT, 1 }, 110 { "nfsv2", 0, ALTF_NFSV2, 1 }, 111 { "acregmin=", 0, ALTF_ACREGMIN, 1 }, 112 { "acregmax=", 0, ALTF_ACREGMAX, 1 }, 113 { "acdirmin=", 0, ALTF_ACDIRMIN, 1 }, 114 { "acdirmax=", 0, ALTF_ACDIRMAX, 1 }, 115 MOPT_NULL 116 }; 117 118 struct nfs_args nfsdefargs = { 119 NFS_ARGSVERSION, 120 (struct sockaddr *)0, 121 sizeof (struct sockaddr_in), 122 SOCK_DGRAM, 123 0, 124 (u_char *)0, 125 0, 126 NFSMNT_RESVPORT, 127 NFS_WSIZE, 128 NFS_RSIZE, 129 NFS_READDIRSIZE, 130 10, 131 NFS_RETRANS, 132 NFS_MAXGRPS, 133 NFS_DEFRAHEAD, 134 0, 135 NFS_DEADTHRESH, 136 (char *)0, 137 /* args version 4 */ 138 NFS_MINATTRTIMO, 139 NFS_MAXATTRTIMO, 140 NFS_MINDIRATTRTIMO, 141 NFS_MAXDIRATTRTIMO, 142 }; 143 144 struct nfhret { 145 u_long stat; 146 long vers; 147 long auth; 148 long fhsize; 149 u_char nfh[NFSX_V3FHMAX]; 150 }; 151 152 #define BGRND 0x0001 153 #define ISBGRND 0x0002 154 #define DIDWARN 0x0004 155 156 int retrycnt = -1; 157 int opflags = 0; 158 int nfsproto = IPPROTO_UDP; 159 int mnttcp_ok = 1; 160 u_short port_no = 0; 161 enum mountmode { 162 ANY, 163 V2, 164 V3 165 } mountmode = ANY; 166 167 #ifdef NFSKERB 168 char inst[INST_SZ]; 169 char realm[REALM_SZ]; 170 struct { 171 u_long kind; 172 KTEXT_ST kt; 173 } ktick; 174 struct nfsrpc_nickverf kverf; 175 struct nfsrpc_fullblock kin, kout; 176 NFSKERBKEY_T kivec; 177 CREDENTIALS kcr; 178 struct timeval ktv; 179 NFSKERBKEYSCHED_T kerb_keysched; 180 #endif 181 182 /* Return codes for nfs_tryproto. */ 183 enum tryret { 184 TRYRET_SUCCESS, 185 TRYRET_TIMEOUT, /* No response received. */ 186 TRYRET_REMOTEERR, /* Error received from remote server. */ 187 TRYRET_LOCALERR /* Local failure. */ 188 }; 189 190 void set_rpc_maxgrouplist(int); 191 192 static int getnfsargs(char *, struct nfs_args *); 193 static void usage(void) __dead2; 194 static int xdr_dir(XDR *, char *); 195 static int xdr_fh(XDR *, struct nfhret *); 196 static enum tryret 197 nfs_tryproto(struct nfs_args *, struct sockaddr_in *, 198 char *, char *, char **); 199 static enum tryret 200 returncode(enum clnt_stat, struct rpc_err *); 201 202 /* 203 * Used to set mount flags with getmntopts. Call with dir=TRUE to 204 * initialize altflags from the current mount flags. Call with 205 * dir=FALSE to update mount flags with the new value of altflags after 206 * the call to getmntopts. 207 */ 208 static void 209 set_flags(int* altflags, int* nfsflags, int dir) 210 { 211 #define F2(af, nf) \ 212 if (dir) { \ 213 if (*nfsflags & NFSMNT_##nf) \ 214 *altflags |= ALTF_##af; \ 215 else \ 216 *altflags &= ~ALTF_##af; \ 217 } else { \ 218 if (*altflags & ALTF_##af) \ 219 *nfsflags |= NFSMNT_##nf; \ 220 else \ 221 *nfsflags &= ~NFSMNT_##nf; \ 222 } 223 #define F(f) F2(f,f) 224 225 F(NOCONN); 226 F(DUMBTIMR); 227 F2(INTR, INT); 228 #ifdef NFSKERB 229 F(KERB); 230 #endif 231 F(RDIRPLUS); 232 F(RESVPORT); 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 int c; 247 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 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:iKlm:No:PR: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 nfsargsp->flags |= NFSMNT_RDIRPLUS; 328 break; 329 #ifdef NFSKERB 330 case 'm': 331 strncpy(realm, optarg, REALM_SZ - 1); 332 realm[REALM_SZ - 1] = '\0'; 333 break; 334 #endif 335 case 'N': 336 nfsargsp->flags &= ~NFSMNT_RESVPORT; 337 break; 338 case 'o': 339 altflags = 0; 340 set_flags(&altflags, &nfsargsp->flags, TRUE); 341 if (mountmode == V2) 342 altflags |= ALTF_NFSV2; 343 else if (mountmode == V3) 344 altflags |= ALTF_NFSV3; 345 getmntopts(optarg, mopts, &mntflags, &altflags); 346 set_flags(&altflags, &nfsargsp->flags, FALSE); 347 /* 348 * Handle altflags which don't map directly to 349 * mount flags. 350 */ 351 if(altflags & ALTF_BG) 352 opflags |= BGRND; 353 if(altflags & ALTF_MNTUDP) 354 mnttcp_ok = 0; 355 if(altflags & ALTF_TCP) { 356 nfsargsp->sotype = SOCK_STREAM; 357 nfsproto = IPPROTO_TCP; 358 } 359 if(altflags & ALTF_PORT) 360 port_no = atoi(strstr(optarg, "port=") + 5); 361 mountmode = ANY; 362 if(altflags & ALTF_NFSV2) 363 mountmode = V2; 364 if(altflags & ALTF_NFSV3) 365 mountmode = V3; 366 if(altflags & ALTF_ACREGMIN) 367 nfsargsp->acregmin = atoi(strstr(optarg, 368 "acregmin=") + 9); 369 if(altflags & ALTF_ACREGMAX) 370 nfsargsp->acregmax = atoi(strstr(optarg, 371 "acregmax=") + 9); 372 if(altflags & ALTF_ACDIRMIN) 373 nfsargsp->acdirmin = atoi(strstr(optarg, 374 "acdirmin=") + 9); 375 if(altflags & ALTF_ACDIRMAX) 376 nfsargsp->acdirmax = atoi(strstr(optarg, 377 "acdirmax=") + 9); 378 break; 379 case 'P': 380 /* obsolete for NFSMNT_RESVPORT, now default */ 381 break; 382 case 'R': 383 num = strtol(optarg, &p, 10); 384 if (*p || num < 0) 385 errx(1, "illegal -R value -- %s", optarg); 386 retrycnt = num; 387 break; 388 case 'r': 389 num = strtol(optarg, &p, 10); 390 if (*p || num <= 0) 391 errx(1, "illegal -r value -- %s", optarg); 392 nfsargsp->rsize = num; 393 nfsargsp->flags |= NFSMNT_RSIZE; 394 break; 395 case 's': 396 nfsargsp->flags |= NFSMNT_SOFT; 397 break; 398 case 'T': 399 nfsargsp->sotype = SOCK_STREAM; 400 nfsproto = IPPROTO_TCP; 401 break; 402 case 't': 403 num = strtol(optarg, &p, 10); 404 if (*p || num <= 0) 405 errx(1, "illegal -t value -- %s", optarg); 406 nfsargsp->timeo = num; 407 nfsargsp->flags |= NFSMNT_TIMEO; 408 break; 409 case 'w': 410 num = strtol(optarg, &p, 10); 411 if (*p || num <= 0) 412 errx(1, "illegal -w value -- %s", optarg); 413 nfsargsp->wsize = num; 414 nfsargsp->flags |= NFSMNT_WSIZE; 415 break; 416 case 'x': 417 num = strtol(optarg, &p, 10); 418 if (*p || num <= 0) 419 errx(1, "illegal -x value -- %s", optarg); 420 nfsargsp->retrans = num; 421 nfsargsp->flags |= NFSMNT_RETRANS; 422 break; 423 case 'U': 424 mnttcp_ok = 0; 425 break; 426 default: 427 usage(); 428 break; 429 } 430 argc -= optind; 431 argv += optind; 432 433 if (argc != 2) { 434 usage(); 435 /* NOTREACHED */ 436 } 437 438 spec = *argv++; 439 name = *argv; 440 441 if (retrycnt == -1) 442 /* The default is to keep retrying forever. */ 443 retrycnt = 0; 444 if (!getnfsargs(spec, nfsargsp)) 445 exit(1); 446 447 /* resolve the mountpoint with realpath(3) */ 448 checkpath(name, mntpath); 449 450 error = getvfsbyname("nfs", &vfc); 451 if (error && vfsisloadable("nfs")) { 452 if(vfsload("nfs")) 453 err(EX_OSERR, "vfsload(nfs)"); 454 endvfsent(); /* clear cache */ 455 error = getvfsbyname("nfs", &vfc); 456 } 457 if (error) 458 errx(EX_OSERR, "nfs filesystem is not available"); 459 460 if (mount(vfc.vfc_name, mntpath, mntflags, nfsargsp)) 461 err(1, "%s", mntpath); 462 if (nfsargsp->flags & NFSMNT_KERB) { 463 if ((opflags & ISBGRND) == 0) { 464 if (daemon(0, 0) != 0) 465 err(1, "daemon"); 466 } 467 openlog("mount_nfs", LOG_PID, LOG_DAEMON); 468 nfssvc_flag = NFSSVC_MNTD; 469 ncd.ncd_dirp = mntpath; 470 while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) { 471 if (errno != ENEEDAUTH) { 472 syslog(LOG_ERR, "nfssvc err %m"); 473 continue; 474 } 475 nfssvc_flag = 476 NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL; 477 #ifdef NFSKERB 478 /* 479 * Set up as ncd_authuid for the kerberos call. 480 * Must set ruid to ncd_authuid and reset the 481 * ticket name iff ncd_authuid is not the same 482 * as last time, so that the right ticket file 483 * is found. 484 * Get the Kerberos credential structure so that 485 * we have the session key and get a ticket for 486 * this uid. 487 * For more info see the IETF Draft "Authentication 488 * in ONC RPC". 489 */ 490 if (ncd.ncd_authuid != last_ruid) { 491 char buf[512]; 492 sprintf(buf, "%s%d", TKT_ROOT, ncd.ncd_authuid); 493 krb_set_tkt_string(buf); 494 last_ruid = ncd.ncd_authuid; 495 } 496 setreuid(ncd.ncd_authuid, 0); 497 kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr); 498 if (kret == RET_NOTKT) { 499 kret = get_ad_tkt(NFS_KERBSRV, inst, realm, 500 DEFAULT_TKT_LIFE); 501 if (kret == KSUCCESS) 502 kret = krb_get_cred(NFS_KERBSRV, inst, realm, 503 &kcr); 504 } 505 if (kret == KSUCCESS) 506 kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst, 507 realm, 0); 508 509 /* 510 * Fill in the AKN_FULLNAME authenticator and verifier. 511 * Along with the Kerberos ticket, we need to build 512 * the timestamp verifier and encrypt it in CBC mode. 513 */ 514 if (kret == KSUCCESS && 515 ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED) 516 && gettimeofday(&ktv, (struct timezone *)0) == 0) { 517 ncd.ncd_authtype = RPCAUTH_KERB4; 518 ncd.ncd_authstr = (u_char *)&ktick; 519 ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) + 520 3 * NFSX_UNSIGNED; 521 ncd.ncd_verfstr = (u_char *)&kverf; 522 ncd.ncd_verflen = sizeof (kverf); 523 memmove(ncd.ncd_key, kcr.session, 524 sizeof (kcr.session)); 525 kin.t1 = htonl(ktv.tv_sec); 526 kin.t2 = htonl(ktv.tv_usec); 527 kin.w1 = htonl(NFS_KERBTTL); 528 kin.w2 = htonl(NFS_KERBTTL - 1); 529 bzero((caddr_t)kivec, sizeof (kivec)); 530 531 /* 532 * Encrypt kin in CBC mode using the session 533 * key in kcr. 534 */ 535 XXX 536 537 /* 538 * Finally, fill the timestamp verifier into the 539 * authenticator and verifier. 540 */ 541 ktick.kind = htonl(RPCAKN_FULLNAME); 542 kverf.kind = htonl(RPCAKN_FULLNAME); 543 NFS_KERBW1(ktick.kt) = kout.w1; 544 ktick.kt.length = htonl(ktick.kt.length); 545 kverf.verf.t1 = kout.t1; 546 kverf.verf.t2 = kout.t2; 547 kverf.verf.w2 = kout.w2; 548 nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH; 549 } 550 setreuid(0, 0); 551 #endif /* NFSKERB */ 552 } 553 } 554 exit(0); 555 } 556 557 static int 558 getnfsargs(char *spec, struct nfs_args *nfsargsp) 559 { 560 struct hostent *hp; 561 struct sockaddr_in saddr; 562 struct in_addr iaddr; 563 enum tryret ret; 564 int speclen, remoteerr; 565 char *hostp, *delimp, *errstr; 566 #ifdef NFSKERB 567 char *cp; 568 #endif 569 size_t len; 570 static char nam[MNAMELEN + 1]; 571 572 if ((delimp = strrchr(spec, ':')) != NULL) { 573 hostp = spec; 574 spec = delimp + 1; 575 } else if ((delimp = strrchr(spec, '@')) != NULL) { 576 warnx("path@server syntax is deprecated, use server:path"); 577 hostp = delimp + 1; 578 } else { 579 warnx("no <host>:<dirpath> nfs-name"); 580 return (0); 581 } 582 *delimp = '\0'; 583 584 /* 585 * If there has been a trailing slash at mounttime it seems 586 * that some mountd implementations fail to remove the mount 587 * entries from their mountlist while unmounting. 588 */ 589 for (speclen = strlen(spec); 590 speclen > 1 && spec[speclen - 1] == '/'; 591 speclen--) 592 spec[speclen - 1] = '\0'; 593 if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) { 594 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG)); 595 return (0); 596 } 597 /* Make both '@' and ':' notations equal */ 598 if (*hostp != '\0') { 599 len = strlen(hostp); 600 memmove(nam, hostp, len); 601 nam[len] = ':'; 602 memmove(nam + len + 1, spec, speclen); 603 nam[len + speclen + 1] = '\0'; 604 } 605 606 /* 607 * Handle an internet host address and reverse resolve it if 608 * doing Kerberos. 609 */ 610 bzero(&saddr, sizeof saddr); 611 saddr.sin_family = AF_INET; 612 saddr.sin_len = sizeof saddr; 613 614 if (port_no != 0) 615 saddr.sin_port = htons(port_no); 616 617 for (;;) { 618 int haserror = 0; 619 620 /* 621 * Adjust DNS timeouts so we do not linger in the foreground 622 * if we can be backgrounded. 623 */ 624 switch(opflags & (BGRND | ISBGRND)) { 625 case BGRND: 626 _res.retry = 1; 627 _res.retrans = 1; 628 break; 629 case BGRND|ISBGRND: 630 _res.retry = 3; 631 _res.retrans = 3; 632 break; 633 } 634 if (inet_pton(AF_INET, hostp, &iaddr) == 1) { 635 saddr.sin_addr = iaddr; 636 } else if ((hp = gethostbyname(hostp)) != NULL) { 637 memmove(&saddr.sin_addr, hp->h_addr, 638 MIN(hp->h_length, (int)sizeof(saddr.sin_addr))); 639 } else { 640 warnx("can't get net id for host: %s", hostp); 641 opflags |= DIDWARN; 642 haserror = h_errno; 643 } 644 #ifdef NFSKERB 645 if (haserror == 0 && (nfsargsp->flags & NFSMNT_KERB)) { 646 if ((hp = gethostbyaddr((char *)&saddr.sin_addr.s_addr, 647 sizeof (u_long), AF_INET)) == NULL) { 648 warnx("can't reverse resolve net address"); 649 opflags |= DIDWARN; 650 haserror = h_errno; 651 } else { 652 memmove(&saddr.sin_addr, hp->h_addr, 653 MIN(hp->h_length, sizeof(saddr.sin_addr))); 654 strncpy(inst, hp->h_name, INST_SZ); 655 inst[INST_SZ - 1] = '\0'; 656 if (cp = strchr(inst, '.')) 657 *cp = '\0'; 658 } 659 } 660 #endif /* NFSKERB */ 661 /* 662 * If no error occured we do not have to retry again. 663 * Otherwise try to backgruond us if possible. 664 */ 665 if (haserror == 0) 666 break; 667 668 switch(opflags & (BGRND | ISBGRND)) { 669 case BGRND: 670 if (haserror != EAI_AGAIN) 671 return(0); 672 /* recoverable error */ 673 warnx("Cannot immediately mount %s:%s, backgrounding", 674 hostp, spec); 675 opflags |= DIDWARN; 676 opflags |= ISBGRND; 677 if (daemon(0, 0) != 0) 678 err(1, "daemon"); 679 break; 680 default: 681 /* 682 * Already backgrounded or cannot be backgrounded. 683 */ 684 if (haserror != EAI_AGAIN) 685 return(0); 686 break; 687 } 688 sleep(20); 689 endhostent(); 690 } 691 if (opflags & DIDWARN) { 692 opflags &= ~DIDWARN; 693 warnx("successfully resolved %s after prior failures", hostp); 694 } 695 696 ret = TRYRET_LOCALERR; 697 for (;;) { 698 remoteerr = 0; 699 ret = nfs_tryproto(nfsargsp, &saddr, hostp, spec, &errstr); 700 if (ret == TRYRET_SUCCESS) 701 break; 702 if (ret != TRYRET_LOCALERR) 703 remoteerr = 1; 704 if ((opflags & ISBGRND) == 0) 705 fprintf(stderr, "%s\n", errstr); 706 707 /* Exit if all errors were local. */ 708 if (!remoteerr) 709 exit(1); 710 711 /* 712 * If retrycnt == 0, we are to keep retrying forever. 713 * Otherwise decrement it, and exit if it hits zero. 714 */ 715 if (retrycnt != 0 && --retrycnt == 0) 716 exit(1); 717 718 if ((opflags & (BGRND | ISBGRND)) == BGRND) { 719 warnx("Cannot immediately mount %s:%s, backgrounding", 720 hostp, spec); 721 opflags |= ISBGRND; 722 opflags |= DIDWARN; 723 if (daemon(0, 0) != 0) 724 err(1, "daemon"); 725 } 726 sleep(20); 727 } 728 if (opflags & DIDWARN) { 729 opflags &= ~DIDWARN; 730 warnx("successfully mounted %s after prior failures", spec); 731 } 732 nfsargsp->hostname = nam; 733 /* Add mounted filesystem to PATH_MOUNTTAB */ 734 if (!add_mtab(hostp, spec)) 735 warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec); 736 return (1); 737 } 738 739 /* 740 * Try to set up the NFS arguments according to the address 741 * (and possibly port) specified by `sinp'. 742 * 743 * Returns TRYRET_SUCCESS if successful, or: 744 * TRYRET_TIMEOUT The server did not respond. 745 * TRYRET_REMOTEERR The server reported an error. 746 * TRYRET_LOCALERR Local failure. 747 * 748 * In all error cases, *errstr will be set to a statically-allocated string 749 * describing the error. 750 */ 751 static enum tryret 752 nfs_tryproto(struct nfs_args *nfsargsp, struct sockaddr_in *sinp, char *hostp, 753 char *spec, char **errstr) 754 { 755 static char errbuf[256]; 756 struct sockaddr_in sin, tmpsin; 757 struct nfhret nfhret; 758 struct timeval try; 759 struct rpc_err rpcerr; 760 CLIENT *clp; 761 int doconnect, nfsvers, mntvers, so; 762 enum clnt_stat status; 763 enum mountmode trymntmode; 764 765 trymntmode = mountmode; 766 errbuf[0] = '\0'; 767 *errstr = errbuf; 768 sin = tmpsin = *sinp; 769 770 tryagain: 771 if (trymntmode == V2) { 772 nfsvers = 2; 773 mntvers = 1; 774 } else { 775 nfsvers = 3; 776 mntvers = 3; 777 } 778 779 /* Check that the server (nfsd) responds on the port we have chosen. */ 780 try.tv_sec = 10; 781 try.tv_usec = 0; 782 so = RPC_ANYSOCK; 783 if (nfsargsp->sotype == SOCK_STREAM) 784 clp = clnttcp_create(&sin, RPCPROG_NFS, nfsvers, &so, 0, 0); 785 else 786 clp = clntudp_create(&sin, RPCPROG_NFS, nfsvers, try, &so); 787 if (clp == NULL) { 788 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 789 hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS")); 790 return (returncode(rpc_createerr.cf_stat, 791 &rpc_createerr.cf_error)); 792 } 793 if (nfsargsp->sotype == SOCK_DGRAM && 794 !(nfsargsp->flags & NFSMNT_NOCONN)) { 795 /* 796 * Use connect(), to match what the kernel does. This 797 * catches cases where the server responds from the 798 * wrong source address. 799 */ 800 doconnect = 1; 801 if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) { 802 clnt_destroy(clp); 803 snprintf(errbuf, sizeof errbuf, 804 "%s:%s: CLSET_CONNECT failed", hostp, spec); 805 return (TRYRET_LOCALERR); 806 } 807 } 808 809 try.tv_sec = 10; 810 try.tv_usec = 0; 811 status = clnt_call(clp, NFSPROC_NULL, xdr_void, NULL, xdr_void, NULL, 812 try); 813 if (status != RPC_SUCCESS) { 814 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) { 815 clnt_destroy(clp); 816 trymntmode = V2; 817 goto tryagain; 818 } 819 clnt_geterr(clp, &rpcerr); 820 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 821 hostp, spec, clnt_sperror(clp, "NFSPROC_NULL")); 822 clnt_destroy(clp); 823 return (returncode(status, &rpcerr)); 824 } 825 clnt_destroy(clp); 826 827 /* Send the RPCMNT_MOUNT RPC to get the root filehandle. */ 828 tmpsin.sin_port = 0; 829 try.tv_sec = 10; 830 try.tv_usec = 0; 831 so = RPC_ANYSOCK; 832 if (mnttcp_ok && nfsargsp->sotype == SOCK_STREAM) 833 clp = clnttcp_create(&tmpsin, RPCPROG_MNT, mntvers, &so, 0, 0); 834 else 835 clp = clntudp_create(&tmpsin, RPCPROG_MNT, mntvers, try, &so); 836 if (clp == NULL) { 837 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 838 hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create")); 839 return (returncode(rpc_createerr.cf_stat, 840 &rpc_createerr.cf_error)); 841 } 842 clp->cl_auth = authunix_create_default(); 843 if (nfsargsp->flags & NFSMNT_KERB) 844 nfhret.auth = RPCAUTH_KERB4; 845 else 846 nfhret.auth = RPCAUTH_UNIX; 847 nfhret.vers = mntvers; 848 status = clnt_call(clp, RPCMNT_MOUNT, xdr_dir, spec, xdr_fh, &nfhret, 849 try); 850 auth_destroy(clp->cl_auth); 851 if (status != RPC_SUCCESS) { 852 if (status == RPC_PROGVERSMISMATCH && trymntmode == ANY) { 853 clnt_destroy(clp); 854 trymntmode = V2; 855 goto tryagain; 856 } 857 clnt_geterr(clp, &rpcerr); 858 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 859 hostp, spec, clnt_sperror(clp, "RPCPROG_MNT")); 860 clnt_destroy(clp); 861 return (returncode(status, &rpcerr)); 862 } 863 clnt_destroy(clp); 864 865 if (nfhret.stat != 0) { 866 snprintf(errbuf, sizeof errbuf, "%s:%s: %s", 867 hostp, spec, strerror(nfhret.stat)); 868 return (TRYRET_REMOTEERR); 869 } 870 871 /* 872 * Store the filehandle and server address in nfsargsp, making 873 * sure to copy any locally allocated structures. 874 */ 875 nfsargsp->addrlen = sin.sin_len; 876 nfsargsp->addr = malloc(nfsargsp->addrlen); 877 nfsargsp->fhsize = nfhret.fhsize; 878 nfsargsp->fh = malloc(nfsargsp->fhsize); 879 if (nfsargsp->addr == NULL || nfsargsp->fh == NULL) 880 err(1, "malloc"); 881 bcopy(&sin, nfsargsp->addr, nfsargsp->addrlen); 882 bcopy(nfhret.nfh, nfsargsp->fh, nfsargsp->fhsize); 883 884 if (nfsvers == 3) 885 nfsargsp->flags |= NFSMNT_NFSV3; 886 else 887 nfsargsp->flags &= ~NFSMNT_NFSV3; 888 889 return (TRYRET_SUCCESS); 890 } 891 892 /* 893 * Catagorise a RPC return status and error into an `enum tryret' 894 * return code. 895 */ 896 static enum tryret 897 returncode(enum clnt_stat status, struct rpc_err *rpcerr) 898 { 899 switch (status) { 900 case RPC_TIMEDOUT: 901 return (TRYRET_TIMEOUT); 902 case RPC_PMAPFAILURE: 903 case RPC_PROGNOTREGISTERED: 904 case RPC_PROGVERSMISMATCH: 905 /* XXX, these can be local or remote. */ 906 case RPC_CANTSEND: 907 case RPC_CANTRECV: 908 return (TRYRET_REMOTEERR); 909 case RPC_SYSTEMERROR: 910 switch (rpcerr->re_errno) { 911 case ETIMEDOUT: 912 return (TRYRET_TIMEOUT); 913 case ENOMEM: 914 break; 915 default: 916 return (TRYRET_REMOTEERR); 917 } 918 /* FALLTHROUGH */ 919 default: 920 break; 921 } 922 return (TRYRET_LOCALERR); 923 } 924 925 /* 926 * xdr routines for mount rpc's 927 */ 928 static int 929 xdr_dir(XDR *xdrsp, char *dirp) 930 { 931 return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN)); 932 } 933 934 static int 935 xdr_fh(XDR *xdrsp, struct nfhret *np) 936 { 937 int i; 938 long auth, authcnt, authfnd = 0; 939 940 if (!xdr_u_long(xdrsp, &np->stat)) 941 return (0); 942 if (np->stat) 943 return (1); 944 switch (np->vers) { 945 case 1: 946 np->fhsize = NFSX_V2FH; 947 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH)); 948 case 3: 949 if (!xdr_long(xdrsp, &np->fhsize)) 950 return (0); 951 if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX) 952 return (0); 953 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize)) 954 return (0); 955 if (!xdr_long(xdrsp, &authcnt)) 956 return (0); 957 for (i = 0; i < authcnt; i++) { 958 if (!xdr_long(xdrsp, &auth)) 959 return (0); 960 if (auth == np->auth) 961 authfnd++; 962 } 963 /* 964 * Some servers, such as DEC's OSF/1 return a nil authenticator 965 * list to indicate RPCAUTH_UNIX. 966 */ 967 if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX)) 968 np->stat = EAUTH; 969 return (1); 970 }; 971 return (0); 972 } 973 974 static void 975 usage(void) 976 { 977 fprintf(stderr, "%s\n%s\n%s\n%s\n", 978 "usage: mount_nfs [-23KNPTUbcdils] [-D deadthresh] [-I readdirsize]", 979 " [-R retrycnt] [-a maxreadahead]", 980 " [-g maxgroups] [-m realm] [-o options] [-r readsize]", 981 " [-t timeout] [-w writesize] [-x retrans] rhost:path node"); 982 exit(1); 983 } 984