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 * 4. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #if 0
34 #ifndef lint
35 static const char copyright[] =
36 "@(#) Copyright (c) 1992, 1993, 1994\n\
37 The Regents of the University of California. All rights reserved.\n";
38 #endif /* not lint */
39
40 #ifndef lint
41 static char sccsid[] = "@(#)mount_nfs.c 8.11 (Berkeley) 5/4/95";
42 #endif /* not lint */
43 #endif
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD$");
46
47 #include <sys/param.h>
48 #include <sys/linker.h>
49 #include <sys/module.h>
50 #include <sys/mount.h>
51 #include <sys/socket.h>
52 #include <sys/stat.h>
53 #include <sys/syslog.h>
54 #include <sys/uio.h>
55
56 #include <rpc/rpc.h>
57 #include <rpc/pmap_clnt.h>
58 #include <rpc/pmap_prot.h>
59 #include <rpcsvc/nfs_prot.h>
60 #include <rpcsvc/mount.h>
61
62 #include <nfsclient/nfs.h>
63
64 #include <arpa/inet.h>
65
66 #include <ctype.h>
67 #include <err.h>
68 #include <errno.h>
69 #include <fcntl.h>
70 #include <netdb.h>
71 #include <stdio.h>
72 #include <stdlib.h>
73 #include <string.h>
74 #include <strings.h>
75 #include <sysexits.h>
76 #include <unistd.h>
77
78 #include "mntopts.h"
79 #include "mounttab.h"
80
81 /* Table for af,sotype -> netid conversions. */
82 static struct nc_protos {
83 const char *netid;
84 int af;
85 int sotype;
86 } nc_protos[] = {
87 {"udp", AF_INET, SOCK_DGRAM},
88 {"tcp", AF_INET, SOCK_STREAM},
89 {"udp6", AF_INET6, SOCK_DGRAM},
90 {"tcp6", AF_INET6, SOCK_STREAM},
91 {NULL, 0, 0}
92 };
93
94 struct nfhret {
95 u_long stat;
96 long vers;
97 long auth;
98 long fhsize;
99 u_char nfh[NFS3_FHSIZE];
100 };
101 #define BGRND 1
102 #define ISBGRND 2
103 #define OF_NOINET4 4
104 #define OF_NOINET6 8
105 static int retrycnt = -1;
106 static int opflags = 0;
107 static int nfsproto = IPPROTO_TCP;
108 static int mnttcp_ok = 1;
109 static int noconn = 0;
110 /* The 'portspec' is the server nfs port; NULL means look up via rpcbind. */
111 static const char *portspec = NULL;
112 static struct sockaddr *addr;
113 static int addrlen = 0;
114 static u_char *fh = NULL;
115 static int fhsize = 0;
116 static int secflavor = -1;
117 static int got_principal = 0;
118
119 static enum mountmode {
120 ANY,
121 V2,
122 V3,
123 V4
124 } mountmode = ANY;
125
126 /* Return codes for nfs_tryproto. */
127 enum tryret {
128 TRYRET_SUCCESS,
129 TRYRET_TIMEOUT, /* No response received. */
130 TRYRET_REMOTEERR, /* Error received from remote server. */
131 TRYRET_LOCALERR /* Local failure. */
132 };
133
134 static int sec_name_to_num(const char *sec);
135 static const char *sec_num_to_name(int num);
136 static int getnfsargs(char *, struct iovec **iov, int *iovlen);
137 /* void set_rpc_maxgrouplist(int); */
138 static struct netconfig *getnetconf_cached(const char *netid);
139 static const char *netidbytype(int af, int sotype);
140 static void usage(void) __dead2;
141 static int xdr_dir(XDR *, char *);
142 static int xdr_fh(XDR *, struct nfhret *);
143 static enum tryret nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec,
144 char **errstr, struct iovec **iov, int *iovlen);
145 static enum tryret returncode(enum clnt_stat stat, struct rpc_err *rpcerr);
146
147 int
main(int argc,char * argv[])148 main(int argc, char *argv[])
149 {
150 int c;
151 struct iovec *iov;
152 int num, iovlen;
153 char *mntname, *p, *spec, *tmp;
154 char mntpath[MAXPATHLEN], errmsg[255];
155 char hostname[MAXHOSTNAMELEN + 1], gssn[MAXHOSTNAMELEN + 50];
156 const char *fstype, *gssname;
157
158 iov = NULL;
159 iovlen = 0;
160 memset(errmsg, 0, sizeof(errmsg));
161 gssname = NULL;
162
163 fstype = strrchr(argv[0], '_');
164 if (fstype == NULL)
165 errx(EX_USAGE, "argv[0] must end in _fstype");
166
167 ++fstype;
168
169 while ((c = getopt(argc, argv,
170 "23a:bcdD:g:I:iLlNo:PR:r:sTt:w:x:U")) != -1)
171 switch (c) {
172 case '2':
173 mountmode = V2;
174 break;
175 case '3':
176 mountmode = V3;
177 break;
178 case 'a':
179 printf("-a deprecated, use -o readahead=<value>\n");
180 build_iovec(&iov, &iovlen, "readahead", optarg, (size_t)-1);
181 break;
182 case 'b':
183 opflags |= BGRND;
184 break;
185 case 'c':
186 printf("-c deprecated, use -o noconn\n");
187 build_iovec(&iov, &iovlen, "noconn", NULL, 0);
188 noconn = 1;
189 break;
190 case 'D':
191 printf("-D deprecated, use -o deadthresh=<value>\n");
192 build_iovec(&iov, &iovlen, "deadthresh", optarg, (size_t)-1);
193 break;
194 case 'd':
195 printf("-d deprecated, use -o dumbtimer");
196 build_iovec(&iov, &iovlen, "dumbtimer", NULL, 0);
197 break;
198 case 'g':
199 printf("-g deprecated, use -o maxgroups");
200 num = strtol(optarg, &p, 10);
201 if (*p || num <= 0)
202 errx(1, "illegal -g value -- %s", optarg);
203 //set_rpc_maxgrouplist(num);
204 build_iovec(&iov, &iovlen, "maxgroups", optarg, (size_t)-1);
205 break;
206 case 'I':
207 printf("-I deprecated, use -o readdirsize=<value>\n");
208 build_iovec(&iov, &iovlen, "readdirsize", optarg, (size_t)-1);
209 break;
210 case 'i':
211 printf("-i deprecated, use -o intr\n");
212 build_iovec(&iov, &iovlen, "intr", NULL, 0);
213 break;
214 case 'L':
215 printf("-L deprecated, use -o nolockd\n");
216 build_iovec(&iov, &iovlen, "nolockd", NULL, 0);
217 break;
218 case 'l':
219 printf("-l deprecated, -o rdirplus\n");
220 build_iovec(&iov, &iovlen, "rdirplus", NULL, 0);
221 break;
222 case 'N':
223 printf("-N deprecated, do not specify -o resvport\n");
224 break;
225 case 'o': {
226 int pass_flag_to_nmount;
227 char *opt = optarg;
228 while (opt) {
229 char *pval = NULL;
230 char *pnextopt = NULL;
231 const char *val = "";
232 pass_flag_to_nmount = 1;
233 pnextopt = strchr(opt, ',');
234 if (pnextopt != NULL) {
235 *pnextopt = '\0';
236 pnextopt++;
237 }
238 pval = strchr(opt, '=');
239 if (pval != NULL) {
240 *pval = '\0';
241 val = pval + 1;
242 }
243 if (strcmp(opt, "bg") == 0) {
244 opflags |= BGRND;
245 pass_flag_to_nmount=0;
246 } else if (strcmp(opt, "fg") == 0) {
247 /* same as not specifying -o bg */
248 pass_flag_to_nmount=0;
249 } else if (strcmp(opt, "gssname") == 0) {
250 pass_flag_to_nmount = 0;
251 gssname = val;
252 } else if (strcmp(opt, "mntudp") == 0) {
253 mnttcp_ok = 0;
254 nfsproto = IPPROTO_UDP;
255 } else if (strcmp(opt, "udp") == 0) {
256 nfsproto = IPPROTO_UDP;
257 } else if (strcmp(opt, "tcp") == 0) {
258 nfsproto = IPPROTO_TCP;
259 } else if (strcmp(opt, "noinet4") == 0) {
260 pass_flag_to_nmount=0;
261 opflags |= OF_NOINET4;
262 } else if (strcmp(opt, "noinet6") == 0) {
263 pass_flag_to_nmount=0;
264 opflags |= OF_NOINET6;
265 } else if (strcmp(opt, "noconn") == 0) {
266 noconn = 1;
267 } else if (strcmp(opt, "nfsv2") == 0) {
268 pass_flag_to_nmount=0;
269 mountmode = V2;
270 } else if (strcmp(opt, "nfsv3") == 0) {
271 mountmode = V3;
272 } else if (strcmp(opt, "nfsv4") == 0) {
273 pass_flag_to_nmount=0;
274 mountmode = V4;
275 fstype = "nfs";
276 nfsproto = IPPROTO_TCP;
277 if (portspec == NULL)
278 portspec = "2049";
279 } else if (strcmp(opt, "port") == 0) {
280 pass_flag_to_nmount=0;
281 asprintf(&tmp, "%d", atoi(val));
282 if (tmp == NULL)
283 err(1, "asprintf");
284 portspec = tmp;
285 } else if (strcmp(opt, "principal") == 0) {
286 got_principal = 1;
287 } else if (strcmp(opt, "proto") == 0) {
288 pass_flag_to_nmount=0;
289 if (strcmp(val, "tcp") == 0) {
290 nfsproto = IPPROTO_TCP;
291 opflags |= OF_NOINET6;
292 build_iovec(&iov, &iovlen,
293 "tcp", NULL, 0);
294 } else if (strcmp(val, "udp") == 0) {
295 mnttcp_ok = 0;
296 nfsproto = IPPROTO_UDP;
297 opflags |= OF_NOINET6;
298 build_iovec(&iov, &iovlen,
299 "udp", NULL, 0);
300 } else if (strcmp(val, "tcp6") == 0) {
301 nfsproto = IPPROTO_TCP;
302 opflags |= OF_NOINET4;
303 build_iovec(&iov, &iovlen,
304 "tcp", NULL, 0);
305 } else if (strcmp(val, "udp6") == 0) {
306 mnttcp_ok = 0;
307 nfsproto = IPPROTO_UDP;
308 opflags |= OF_NOINET4;
309 build_iovec(&iov, &iovlen,
310 "udp", NULL, 0);
311 } else {
312 errx(1,
313 "illegal proto value -- %s",
314 val);
315 }
316 } else if (strcmp(opt, "sec") == 0) {
317 /*
318 * Don't add this option to
319 * the iovec yet - we will
320 * negotiate which sec flavor
321 * to use with the remote
322 * mountd.
323 */
324 pass_flag_to_nmount=0;
325 secflavor = sec_name_to_num(val);
326 if (secflavor < 0) {
327 errx(1,
328 "illegal sec value -- %s",
329 val);
330 }
331 } else if (strcmp(opt, "retrycnt") == 0) {
332 pass_flag_to_nmount=0;
333 num = strtol(val, &p, 10);
334 if (*p || num < 0)
335 errx(1, "illegal retrycnt value -- %s", val);
336 retrycnt = num;
337 } else if (strcmp(opt, "maxgroups") == 0) {
338 num = strtol(val, &p, 10);
339 if (*p || num <= 0)
340 errx(1, "illegal maxgroups value -- %s", val);
341 //set_rpc_maxgrouplist(num);
342 } else if (strcmp(opt, "vers") == 0) {
343 num = strtol(val, &p, 10);
344 if (*p || num <= 0)
345 errx(1, "illegal vers value -- "
346 "%s", val);
347 switch (num) {
348 case 2:
349 mountmode = V2;
350 break;
351 case 3:
352 mountmode = V3;
353 build_iovec(&iov, &iovlen,
354 "nfsv3", NULL, 0);
355 break;
356 case 4:
357 mountmode = V4;
358 fstype = "nfs";
359 nfsproto = IPPROTO_TCP;
360 if (portspec == NULL)
361 portspec = "2049";
362 break;
363 default:
364 errx(1, "illegal nfs version "
365 "value -- %s", val);
366 }
367 pass_flag_to_nmount=0;
368 }
369 if (pass_flag_to_nmount) {
370 build_iovec(&iov, &iovlen, opt,
371 __DECONST(void *, val),
372 strlen(val) + 1);
373 }
374 opt = pnextopt;
375 }
376 }
377 break;
378 case 'P':
379 /* obsolete for -o noresvport now default */
380 printf("-P deprecated, use -o noresvport\n");
381 build_iovec(&iov, &iovlen, "noresvport", NULL, 0);
382 break;
383 case 'R':
384 printf("-R deprecated, use -o retrycnt=<retrycnt>\n");
385 num = strtol(optarg, &p, 10);
386 if (*p || num < 0)
387 errx(1, "illegal -R value -- %s", optarg);
388 retrycnt = num;
389 break;
390 case 'r':
391 printf("-r deprecated, use -o rsize=<rsize>\n");
392 build_iovec(&iov, &iovlen, "rsize", optarg, (size_t)-1);
393 break;
394 case 's':
395 printf("-s deprecated, use -o soft\n");
396 build_iovec(&iov, &iovlen, "soft", NULL, 0);
397 break;
398 case 'T':
399 nfsproto = IPPROTO_TCP;
400 printf("-T deprecated, use -o tcp\n");
401 break;
402 case 't':
403 printf("-t deprecated, use -o timeout=<value>\n");
404 build_iovec(&iov, &iovlen, "timeout", optarg, (size_t)-1);
405 break;
406 case 'w':
407 printf("-w deprecated, use -o wsize=<value>\n");
408 build_iovec(&iov, &iovlen, "wsize", optarg, (size_t)-1);
409 break;
410 case 'x':
411 printf("-x deprecated, use -o retrans=<value>\n");
412 build_iovec(&iov, &iovlen, "retrans", optarg, (size_t)-1);
413 break;
414 case 'U':
415 printf("-U deprecated, use -o mntudp\n");
416 mnttcp_ok = 0;
417 nfsproto = IPPROTO_UDP;
418 build_iovec(&iov, &iovlen, "mntudp", NULL, 0);
419 break;
420 default:
421 usage();
422 break;
423 }
424 argc -= optind;
425 argv += optind;
426
427 if (argc != 2) {
428 usage();
429 /* NOTREACHED */
430 }
431
432 spec = *argv++;
433 mntname = *argv;
434
435 if (retrycnt == -1)
436 /* The default is to keep retrying forever. */
437 retrycnt = 0;
438
439 /*
440 * If the fstye is "oldnfs", run the old NFS client unless the
441 * "nfsv4" option was specified.
442 */
443 if (strcmp(fstype, "nfs") == 0) {
444 if (modfind("nfscl") < 0) {
445 /* Not present in kernel, try loading it */
446 if (kldload("nfscl") < 0 ||
447 modfind("nfscl") < 0)
448 errx(1, "nfscl is not available");
449 }
450 }
451
452 /*
453 * Add the fqdn to the gssname, as required.
454 */
455 if (gssname != NULL) {
456 if (strchr(gssname, '@') == NULL &&
457 gethostname(hostname, MAXHOSTNAMELEN) == 0) {
458 snprintf(gssn, sizeof (gssn), "%s@%s", gssname,
459 hostname);
460 gssname = gssn;
461 }
462 build_iovec(&iov, &iovlen, "gssname",
463 __DECONST(void *, gssname), strlen(gssname) + 1);
464 }
465
466 if (!getnfsargs(spec, &iov, &iovlen))
467 exit(1);
468
469 /* resolve the mountpoint with realpath(3) */
470 if (checkpath(mntname, mntpath) != 0)
471 err(1, "%s", mntpath);
472
473 build_iovec(&iov, &iovlen, "fstype",
474 __DECONST(void *, fstype), (size_t)-1);
475 build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
476 build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
477
478 if (nmount(iov, iovlen, 0))
479 err(1, "%s, %s", mntpath, errmsg);
480
481 exit(0);
482 }
483
484 static int
sec_name_to_num(const char * sec)485 sec_name_to_num(const char *sec)
486 {
487 if (!strcmp(sec, "krb5"))
488 return (RPCSEC_GSS_KRB5);
489 if (!strcmp(sec, "krb5i"))
490 return (RPCSEC_GSS_KRB5I);
491 if (!strcmp(sec, "krb5p"))
492 return (RPCSEC_GSS_KRB5P);
493 if (!strcmp(sec, "sys"))
494 return (AUTH_SYS);
495 return (-1);
496 }
497
498 static const char *
sec_num_to_name(int flavor)499 sec_num_to_name(int flavor)
500 {
501 switch (flavor) {
502 case RPCSEC_GSS_KRB5:
503 return ("krb5");
504 case RPCSEC_GSS_KRB5I:
505 return ("krb5i");
506 case RPCSEC_GSS_KRB5P:
507 return ("krb5p");
508 case AUTH_SYS:
509 return ("sys");
510 }
511 return (NULL);
512 }
513
514 static int
getnfsargs(char * spec,struct iovec ** iov,int * iovlen)515 getnfsargs(char *spec, struct iovec **iov, int *iovlen)
516 {
517 struct addrinfo hints, *ai_nfs, *ai;
518 enum tryret ret;
519 int ecode, speclen, remoteerr, offset, have_bracket = 0;
520 char *hostp, *delimp, *errstr;
521 size_t len;
522 static char nam[MNAMELEN + 1], pname[MAXHOSTNAMELEN + 5];
523
524 if (*spec == '[' && (delimp = strchr(spec + 1, ']')) != NULL &&
525 *(delimp + 1) == ':') {
526 hostp = spec + 1;
527 spec = delimp + 2;
528 have_bracket = 1;
529 } else if ((delimp = strrchr(spec, ':')) != NULL) {
530 hostp = spec;
531 spec = delimp + 1;
532 } else if ((delimp = strrchr(spec, '@')) != NULL) {
533 warnx("path@server syntax is deprecated, use server:path");
534 hostp = delimp + 1;
535 } else {
536 warnx("no <host>:<dirpath> nfs-name");
537 return (0);
538 }
539 *delimp = '\0';
540
541 /*
542 * If there has been a trailing slash at mounttime it seems
543 * that some mountd implementations fail to remove the mount
544 * entries from their mountlist while unmounting.
545 */
546 for (speclen = strlen(spec);
547 speclen > 1 && spec[speclen - 1] == '/';
548 speclen--)
549 spec[speclen - 1] = '\0';
550 if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
551 warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
552 return (0);
553 }
554 /* Make both '@' and ':' notations equal */
555 if (*hostp != '\0') {
556 len = strlen(hostp);
557 offset = 0;
558 if (have_bracket)
559 nam[offset++] = '[';
560 memmove(nam + offset, hostp, len);
561 if (have_bracket)
562 nam[len + offset++] = ']';
563 nam[len + offset++] = ':';
564 memmove(nam + len + offset, spec, speclen);
565 nam[len + speclen + offset] = '\0';
566 }
567
568 /*
569 * Handle an internet host address.
570 */
571 memset(&hints, 0, sizeof hints);
572 hints.ai_flags = AI_NUMERICHOST;
573 if (nfsproto == IPPROTO_TCP)
574 hints.ai_socktype = SOCK_STREAM;
575 else if (nfsproto == IPPROTO_UDP)
576 hints.ai_socktype = SOCK_DGRAM;
577
578 if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
579 hints.ai_flags = AI_CANONNAME;
580 if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
581 != 0) {
582 if (portspec == NULL)
583 errx(1, "%s: %s", hostp, gai_strerror(ecode));
584 else
585 errx(1, "%s:%s: %s", hostp, portspec,
586 gai_strerror(ecode));
587 return (0);
588 }
589
590 /*
591 * For a Kerberized nfs mount where the "principal"
592 * argument has not been set, add it here.
593 */
594 if (got_principal == 0 && secflavor >= 0 &&
595 secflavor != AUTH_SYS && ai_nfs->ai_canonname != NULL) {
596 snprintf(pname, sizeof (pname), "nfs@%s",
597 ai_nfs->ai_canonname);
598 build_iovec(iov, iovlen, "principal", pname,
599 strlen(pname) + 1);
600 }
601 }
602
603 ret = TRYRET_LOCALERR;
604 for (;;) {
605 /*
606 * Try each entry returned by getaddrinfo(). Note the
607 * occurrence of remote errors by setting `remoteerr'.
608 */
609 remoteerr = 0;
610 for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
611 if ((ai->ai_family == AF_INET6) &&
612 (opflags & OF_NOINET6))
613 continue;
614 if ((ai->ai_family == AF_INET) &&
615 (opflags & OF_NOINET4))
616 continue;
617 ret = nfs_tryproto(ai, hostp, spec, &errstr, iov,
618 iovlen);
619 if (ret == TRYRET_SUCCESS)
620 break;
621 if (ret != TRYRET_LOCALERR)
622 remoteerr = 1;
623 if ((opflags & ISBGRND) == 0)
624 fprintf(stderr, "%s\n", errstr);
625 }
626 if (ret == TRYRET_SUCCESS)
627 break;
628
629 /* Exit if all errors were local. */
630 if (!remoteerr)
631 exit(1);
632
633 /*
634 * If retrycnt == 0, we are to keep retrying forever.
635 * Otherwise decrement it, and exit if it hits zero.
636 */
637 if (retrycnt != 0 && --retrycnt == 0)
638 exit(1);
639
640 if ((opflags & (BGRND | ISBGRND)) == BGRND) {
641 warnx("Cannot immediately mount %s:%s, backgrounding",
642 hostp, spec);
643 opflags |= ISBGRND;
644 if (daemon(0, 0) != 0)
645 err(1, "daemon");
646 }
647 sleep(60);
648 }
649 freeaddrinfo(ai_nfs);
650
651 build_iovec(iov, iovlen, "hostname", nam, (size_t)-1);
652 /* Add mounted file system to PATH_MOUNTTAB */
653 if (!add_mtab(hostp, spec))
654 warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
655 return (1);
656 }
657
658 /*
659 * Try to set up the NFS arguments according to the address
660 * family, protocol (and possibly port) specified in `ai'.
661 *
662 * Returns TRYRET_SUCCESS if successful, or:
663 * TRYRET_TIMEOUT The server did not respond.
664 * TRYRET_REMOTEERR The server reported an error.
665 * TRYRET_LOCALERR Local failure.
666 *
667 * In all error cases, *errstr will be set to a statically-allocated string
668 * describing the error.
669 */
670 static enum tryret
nfs_tryproto(struct addrinfo * ai,char * hostp,char * spec,char ** errstr,struct iovec ** iov,int * iovlen)671 nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec, char **errstr,
672 struct iovec **iov, int *iovlen)
673 {
674 static char errbuf[256];
675 struct sockaddr_storage nfs_ss;
676 struct netbuf nfs_nb;
677 struct nfhret nfhret;
678 struct timeval try;
679 struct rpc_err rpcerr;
680 CLIENT *clp;
681 struct netconfig *nconf, *nconf_mnt;
682 const char *netid, *netid_mnt, *secname;
683 int doconnect, nfsvers, mntvers, sotype;
684 enum clnt_stat clntstat;
685 enum mountmode trymntmode;
686
687 sotype = 0;
688 trymntmode = mountmode;
689 errbuf[0] = '\0';
690 *errstr = errbuf;
691
692 if (nfsproto == IPPROTO_TCP)
693 sotype = SOCK_STREAM;
694 else if (nfsproto == IPPROTO_UDP)
695 sotype = SOCK_DGRAM;
696
697 if ((netid = netidbytype(ai->ai_family, sotype)) == NULL) {
698 snprintf(errbuf, sizeof errbuf,
699 "af %d sotype %d not supported", ai->ai_family, sotype);
700 return (TRYRET_LOCALERR);
701 }
702 if ((nconf = getnetconf_cached(netid)) == NULL) {
703 snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
704 return (TRYRET_LOCALERR);
705 }
706 /* The RPCPROG_MNT netid may be different. */
707 if (mnttcp_ok) {
708 netid_mnt = netid;
709 nconf_mnt = nconf;
710 } else {
711 if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
712 == NULL) {
713 snprintf(errbuf, sizeof errbuf,
714 "af %d sotype SOCK_DGRAM not supported",
715 ai->ai_family);
716 return (TRYRET_LOCALERR);
717 }
718 if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
719 snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
720 nc_sperror());
721 return (TRYRET_LOCALERR);
722 }
723 }
724
725 tryagain:
726 if (trymntmode == V4) {
727 nfsvers = 4;
728 mntvers = 3; /* Workaround for GCC. */
729 } else if (trymntmode == V2) {
730 nfsvers = 2;
731 mntvers = 1;
732 } else {
733 nfsvers = 3;
734 mntvers = 3;
735 }
736
737 if (portspec != NULL) {
738 /* `ai' contains the complete nfsd sockaddr. */
739 nfs_nb.buf = ai->ai_addr;
740 nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
741 } else {
742 /* Ask the remote rpcbind. */
743 nfs_nb.buf = &nfs_ss;
744 nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
745
746 if (!rpcb_getaddr(NFS_PROGRAM, nfsvers, nconf, &nfs_nb,
747 hostp)) {
748 if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
749 trymntmode == ANY) {
750 trymntmode = V2;
751 goto tryagain;
752 }
753 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
754 netid, hostp, spec,
755 clnt_spcreateerror("RPCPROG_NFS"));
756 return (returncode(rpc_createerr.cf_stat,
757 &rpc_createerr.cf_error));
758 }
759 }
760
761 /* Check that the server (nfsd) responds on the port we have chosen. */
762 clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, NFS_PROGRAM, nfsvers,
763 0, 0);
764 if (clp == NULL) {
765 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
766 hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
767 return (returncode(rpc_createerr.cf_stat,
768 &rpc_createerr.cf_error));
769 }
770 if (sotype == SOCK_DGRAM && noconn == 0) {
771 /*
772 * Use connect(), to match what the kernel does. This
773 * catches cases where the server responds from the
774 * wrong source address.
775 */
776 doconnect = 1;
777 if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
778 clnt_destroy(clp);
779 snprintf(errbuf, sizeof errbuf,
780 "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
781 spec);
782 return (TRYRET_LOCALERR);
783 }
784 }
785
786 try.tv_sec = 10;
787 try.tv_usec = 0;
788 clntstat = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
789 (xdrproc_t)xdr_void, NULL, try);
790 if (clntstat != RPC_SUCCESS) {
791 if (clntstat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
792 clnt_destroy(clp);
793 trymntmode = V2;
794 goto tryagain;
795 }
796 clnt_geterr(clp, &rpcerr);
797 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
798 hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
799 clnt_destroy(clp);
800 return (returncode(clntstat, &rpcerr));
801 }
802 clnt_destroy(clp);
803
804 /*
805 * For NFSv4, there is no mount protocol.
806 */
807 if (trymntmode == V4) {
808 /*
809 * Store the server address in nfsargsp, making
810 * sure to copy any locally allocated structures.
811 */
812 addrlen = nfs_nb.len;
813 addr = malloc(addrlen);
814 if (addr == NULL)
815 err(1, "malloc");
816 bcopy(nfs_nb.buf, addr, addrlen);
817
818 build_iovec(iov, iovlen, "addr", addr, addrlen);
819 secname = sec_num_to_name(secflavor);
820 if (secname != NULL) {
821 build_iovec(iov, iovlen, "sec",
822 __DECONST(void *, secname), (size_t)-1);
823 }
824 build_iovec(iov, iovlen, "nfsv4", NULL, 0);
825 build_iovec(iov, iovlen, "dirpath", spec, (size_t)-1);
826
827 return (TRYRET_SUCCESS);
828 }
829
830 /* Send the MOUNTPROC_MNT RPC to get the root filehandle. */
831 try.tv_sec = 10;
832 try.tv_usec = 0;
833 clp = clnt_tp_create(hostp, MOUNTPROG, mntvers, nconf_mnt);
834 if (clp == NULL) {
835 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
836 hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
837 return (returncode(rpc_createerr.cf_stat,
838 &rpc_createerr.cf_error));
839 }
840 clp->cl_auth = authsys_create_default();
841 nfhret.auth = secflavor;
842 nfhret.vers = mntvers;
843 clntstat = clnt_call(clp, MOUNTPROC_MNT, (xdrproc_t)xdr_dir, spec,
844 (xdrproc_t)xdr_fh, &nfhret,
845 try);
846 auth_destroy(clp->cl_auth);
847 if (clntstat != RPC_SUCCESS) {
848 if (clntstat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
849 clnt_destroy(clp);
850 trymntmode = V2;
851 goto tryagain;
852 }
853 clnt_geterr(clp, &rpcerr);
854 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
855 hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
856 clnt_destroy(clp);
857 return (returncode(clntstat, &rpcerr));
858 }
859 clnt_destroy(clp);
860
861 if (nfhret.stat != 0) {
862 snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
863 hostp, spec, strerror(nfhret.stat));
864 return (TRYRET_REMOTEERR);
865 }
866
867 /*
868 * Store the filehandle and server address in nfsargsp, making
869 * sure to copy any locally allocated structures.
870 */
871 addrlen = nfs_nb.len;
872 addr = malloc(addrlen);
873 fhsize = nfhret.fhsize;
874 fh = malloc(fhsize);
875 if (addr == NULL || fh == NULL)
876 err(1, "malloc");
877 bcopy(nfs_nb.buf, addr, addrlen);
878 bcopy(nfhret.nfh, fh, fhsize);
879
880 build_iovec(iov, iovlen, "addr", addr, addrlen);
881 build_iovec(iov, iovlen, "fh", fh, fhsize);
882 secname = sec_num_to_name(nfhret.auth);
883 if (secname) {
884 build_iovec(iov, iovlen, "sec",
885 __DECONST(void *, secname), (size_t)-1);
886 }
887 if (nfsvers == 3)
888 build_iovec(iov, iovlen, "nfsv3", NULL, 0);
889
890 return (TRYRET_SUCCESS);
891 }
892
893 /*
894 * Catagorise a RPC return status and error into an `enum tryret'
895 * return code.
896 */
897 static enum tryret
returncode(enum clnt_stat clntstat,struct rpc_err * rpcerr)898 returncode(enum clnt_stat clntstat, struct rpc_err *rpcerr)
899 {
900
901 switch (clntstat) {
902 case RPC_TIMEDOUT:
903 return (TRYRET_TIMEOUT);
904 case RPC_PMAPFAILURE:
905 case RPC_PROGNOTREGISTERED:
906 case RPC_PROGVERSMISMATCH:
907 /* XXX, these can be local or remote. */
908 case RPC_CANTSEND:
909 case RPC_CANTRECV:
910 return (TRYRET_REMOTEERR);
911 case RPC_SYSTEMERROR:
912 switch (rpcerr->re_errno) {
913 case ETIMEDOUT:
914 return (TRYRET_TIMEOUT);
915 case ENOMEM:
916 break;
917 default:
918 return (TRYRET_REMOTEERR);
919 }
920 /* FALLTHROUGH */
921 default:
922 break;
923 }
924 return (TRYRET_LOCALERR);
925 }
926
927 /*
928 * Look up a netid based on an address family and socket type.
929 * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
930 *
931 * XXX there should be a library function for this.
932 */
933 static const char *
netidbytype(int af,int sotype)934 netidbytype(int af, int sotype)
935 {
936 struct nc_protos *p;
937
938 for (p = nc_protos; p->netid != NULL; p++) {
939 if (af != p->af || sotype != p->sotype)
940 continue;
941 return (p->netid);
942 }
943 return (NULL);
944 }
945
946 /*
947 * Look up a netconfig entry based on a netid, and cache the result so
948 * that we don't need to remember to call freenetconfigent().
949 *
950 * Otherwise it behaves just like getnetconfigent(), so nc_*error()
951 * work on failure.
952 */
953 static struct netconfig *
getnetconf_cached(const char * netid)954 getnetconf_cached(const char *netid)
955 {
956 static struct nc_entry {
957 struct netconfig *nconf;
958 struct nc_entry *next;
959 } *head;
960 struct nc_entry *p;
961 struct netconfig *nconf;
962
963 for (p = head; p != NULL; p = p->next)
964 if (strcmp(netid, p->nconf->nc_netid) == 0)
965 return (p->nconf);
966
967 if ((nconf = getnetconfigent(netid)) == NULL)
968 return (NULL);
969 if ((p = malloc(sizeof(*p))) == NULL)
970 err(1, "malloc");
971 p->nconf = nconf;
972 p->next = head;
973 head = p;
974
975 return (p->nconf);
976 }
977
978 /*
979 * xdr routines for mount rpc's
980 */
981 static int
xdr_dir(XDR * xdrsp,char * dirp)982 xdr_dir(XDR *xdrsp, char *dirp)
983 {
984 return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
985 }
986
987 static int
xdr_fh(XDR * xdrsp,struct nfhret * np)988 xdr_fh(XDR *xdrsp, struct nfhret *np)
989 {
990 int i;
991 long auth, authcnt, authfnd = 0;
992
993 if (!xdr_u_long(xdrsp, &np->stat))
994 return (0);
995 if (np->stat)
996 return (1);
997 switch (np->vers) {
998 case 1:
999 np->fhsize = NFS_FHSIZE;
1000 return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFS_FHSIZE));
1001 case 3:
1002 if (!xdr_long(xdrsp, &np->fhsize))
1003 return (0);
1004 if (np->fhsize <= 0 || np->fhsize > NFS3_FHSIZE)
1005 return (0);
1006 if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
1007 return (0);
1008 if (!xdr_long(xdrsp, &authcnt))
1009 return (0);
1010 for (i = 0; i < authcnt; i++) {
1011 if (!xdr_long(xdrsp, &auth))
1012 return (0);
1013 if (np->auth == -1) {
1014 np->auth = auth;
1015 authfnd++;
1016 } else if (auth == np->auth) {
1017 authfnd++;
1018 }
1019 }
1020 /*
1021 * Some servers, such as DEC's OSF/1 return a nil authenticator
1022 * list to indicate RPCAUTH_UNIX.
1023 */
1024 if (authcnt == 0 && np->auth == -1)
1025 np->auth = AUTH_SYS;
1026 if (!authfnd && (authcnt > 0 || np->auth != AUTH_SYS))
1027 np->stat = EAUTH;
1028 return (1);
1029 };
1030 return (0);
1031 }
1032
1033 static void
usage(void)1034 usage(void)
1035 {
1036 (void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
1037 "usage: mount_nfs [-23bcdiLlNPsTU] [-a maxreadahead] [-D deadthresh]",
1038 " [-g maxgroups] [-I readdirsize] [-o options] [-R retrycnt]",
1039 " [-r readsize] [-t timeout] [-w writesize] [-x retrans]",
1040 " rhost:path node");
1041 exit(1);
1042 }
1043