xref: /dragonfly/sbin/mount_nfs/mount_nfs.c (revision d5f516c3)
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