mount_nfs.c revision 146853 
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
35static 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
41static 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: head/sbin/mount_nfs/mount_nfs.c 146853 2005-06-01 09:39:36Z delphij $");
46
47#include <sys/param.h>
48#include <sys/mount.h>
49#include <sys/socket.h>
50#include <sys/stat.h>
51#include <sys/syslog.h>
52
53#include <rpc/rpc.h>
54#include <rpc/pmap_clnt.h>
55#include <rpc/pmap_prot.h>
56
57#include <nfs/rpcv2.h>
58#include <nfs/nfsproto.h>
59#include <nfsclient/nfs.h>
60#include <nfsclient/nfsargs.h>
61
62#include <arpa/inet.h>
63
64#include <ctype.h>
65#include <err.h>
66#include <errno.h>
67#include <fcntl.h>
68#include <netdb.h>
69#include <stdio.h>
70#include <stdlib.h>
71#include <string.h>
72#include <strings.h>
73#include <sysexits.h>
74#include <unistd.h>
75
76#include "mntopts.h"
77#include "mounttab.h"
78
79#define	ALTF_BG		0x1
80#define ALTF_NOCONN	0x2
81#define ALTF_DUMBTIMR	0x4
82#define ALTF_INTR	0x8
83#define ALTF_NFSV3	0x20
84#define ALTF_RDIRPLUS	0x40
85#define ALTF_MNTUDP	0x80
86#define ALTF_RESVPORT	0x100
87#define ALTF_SEQPACKET	0x200
88#define ALTF_SOFT	0x800
89#define ALTF_TCP	0x1000
90#define ALTF_PORT	0x2000
91#define ALTF_NFSV2	0x4000
92#define ALTF_ACREGMIN	0x8000
93#define ALTF_ACREGMAX	0x10000
94#define ALTF_ACDIRMIN	0x20000
95#define ALTF_ACDIRMAX	0x40000
96#define ALTF_NOLOCKD	0x80000
97#define ALTF_NOINET4	0x100000
98#define ALTF_NOINET6	0x200000
99
100struct mntopt mopts[] = {
101	MOPT_STDOPTS,
102	MOPT_FORCE,
103	MOPT_UPDATE,
104	MOPT_ASYNC,
105	{ "bg", 0, ALTF_BG, 1 },
106	{ "conn", 1, ALTF_NOCONN, 1 },
107	{ "dumbtimer", 0, ALTF_DUMBTIMR, 1 },
108	{ "intr", 0, ALTF_INTR, 1 },
109	{ "nfsv3", 0, ALTF_NFSV3, 1 },
110	{ "rdirplus", 0, ALTF_RDIRPLUS, 1 },
111	{ "mntudp", 0, ALTF_MNTUDP, 1 },
112	{ "resvport", 0, ALTF_RESVPORT, 1 },
113	{ "soft", 0, ALTF_SOFT, 1 },
114	{ "tcp", 0, ALTF_TCP, 1 },
115	{ "port=", 0, ALTF_PORT, 1 },
116	{ "nfsv2", 0, ALTF_NFSV2, 1 },
117	{ "acregmin=", 0, ALTF_ACREGMIN, 1 },
118	{ "acregmax=", 0, ALTF_ACREGMAX, 1 },
119	{ "acdirmin=", 0, ALTF_ACDIRMIN, 1 },
120	{ "acdirmax=", 0, ALTF_ACDIRMAX, 1 },
121	{ "lockd", 1, ALTF_NOLOCKD, 1 },
122	{ "inet4", 1, ALTF_NOINET4, 1 },
123	{ "inet6", 1, ALTF_NOINET6, 1 },
124	MOPT_NULL
125};
126
127struct nfs_args nfsdefargs = {
128	NFS_ARGSVERSION,
129	NULL,
130	sizeof (struct sockaddr_in),
131	SOCK_DGRAM,
132	0,
133	NULL,
134	0,
135	NFSMNT_RESVPORT,
136	NFS_WSIZE,
137	NFS_RSIZE,
138	NFS_READDIRSIZE,
139	10,
140	NFS_RETRANS,
141	NFS_MAXGRPS,
142	NFS_DEFRAHEAD,
143	0,			/* was: NQ_DEFLEASE */
144	NFS_MAXDEADTHRESH,	/* was: NQ_DEADTHRESH */
145	NULL,
146	/* args version 4 */
147	NFS_MINATTRTIMO,
148	NFS_MAXATTRTIMO,
149	NFS_MINDIRATTRTIMO,
150	NFS_MAXDIRATTRTIMO,
151};
152
153/* Table for af,sotype -> netid conversions. */
154struct nc_protos {
155	char *netid;
156	int af;
157	int sotype;
158} nc_protos[] = {
159	{"udp",		AF_INET,	SOCK_DGRAM},
160	{"tcp",		AF_INET,	SOCK_STREAM},
161	{"udp6",	AF_INET6,	SOCK_DGRAM},
162	{"tcp6",	AF_INET6,	SOCK_STREAM},
163	{NULL}
164};
165
166struct nfhret {
167	u_long		stat;
168	long		vers;
169	long		auth;
170	long		fhsize;
171	u_char		nfh[NFSX_V3FHMAX];
172};
173#define	BGRND	1
174#define	ISBGRND	2
175#define	OF_NOINET4	4
176#define	OF_NOINET6	8
177int retrycnt = -1;
178int opflags = 0;
179int nfsproto = IPPROTO_UDP;
180int mnttcp_ok = 1;
181char *portspec = NULL;	/* Server nfs port; NULL means look up via rpcbind. */
182enum mountmode {
183	ANY,
184	V2,
185	V3
186} mountmode = ANY;
187
188/* Return codes for nfs_tryproto. */
189enum tryret {
190	TRYRET_SUCCESS,
191	TRYRET_TIMEOUT,		/* No response received. */
192	TRYRET_REMOTEERR,	/* Error received from remote server. */
193	TRYRET_LOCALERR		/* Local failure. */
194};
195
196int	getnfsargs(char *, struct nfs_args *);
197/* void	set_rpc_maxgrouplist(int); */
198struct netconfig *getnetconf_cached(const char *netid);
199char	*netidbytype(int af, int sotype);
200void	usage(void) __dead2;
201int	xdr_dir(XDR *, char *);
202int	xdr_fh(XDR *, struct nfhret *);
203enum tryret nfs_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai,
204    char *hostp, char *spec, char **errstr);
205enum tryret returncode(enum clnt_stat stat, struct rpc_err *rpcerr);
206
207/*
208 * Used to set mount flags with getmntopts.  Call with dir=TRUE to
209 * initialize altflags from the current mount flags.  Call with
210 * dir=FALSE to update mount flags with the new value of altflags after
211 * the call to getmntopts.
212 */
213static void
214set_flags(int* altflags, int* nfsflags, int dir)
215{
216#define F2(af, nf)					\
217	if (dir) {					\
218		if (*nfsflags & NFSMNT_##nf)		\
219			*altflags |= ALTF_##af;		\
220		else					\
221			*altflags &= ~ALTF_##af;	\
222	} else {					\
223		if (*altflags & ALTF_##af)		\
224			*nfsflags |= NFSMNT_##nf;	\
225		else					\
226			*nfsflags &= ~NFSMNT_##nf;	\
227	}
228#define F(f)	F2(f,f)
229
230	F(NOCONN);
231	F(DUMBTIMR);
232	F2(INTR, INT);
233	F(RDIRPLUS);
234	F(RESVPORT);
235	F(SOFT);
236	F(ACREGMIN);
237	F(ACREGMAX);
238	F(ACDIRMIN);
239	F(ACDIRMAX);
240	F(NOLOCKD);
241
242#undef F
243#undef F2
244}
245
246int
247main(argc, argv)
248	int argc;
249	char *argv[];
250{
251	int c;
252	struct nfs_args *nfsargsp;
253	struct nfs_args nfsargs;
254	int mntflags, altflags, num;
255	char *name, *p, *spec;
256	char mntpath[MAXPATHLEN];
257
258	mntflags = 0;
259	altflags = 0;
260	nfsargs = nfsdefargs;
261	nfsargsp = &nfsargs;
262	while ((c = getopt(argc, argv,
263	    "23a:bcdD:g:I:iLlNo:PR:r:sTt:w:x:U")) != -1)
264		switch (c) {
265		case '2':
266			mountmode = V2;
267			break;
268		case '3':
269			mountmode = V3;
270			break;
271		case 'a':
272			num = strtol(optarg, &p, 10);
273			if (*p || num < 0)
274				errx(1, "illegal -a value -- %s", optarg);
275			nfsargsp->readahead = num;
276			nfsargsp->flags |= NFSMNT_READAHEAD;
277			break;
278		case 'b':
279			opflags |= BGRND;
280			break;
281		case 'c':
282			nfsargsp->flags |= NFSMNT_NOCONN;
283			break;
284		case 'D':
285			num = strtol(optarg, &p, 10);
286			if (*p || num <= 0)
287				errx(1, "illegal -D value -- %s", optarg);
288			nfsargsp->deadthresh = num;
289			nfsargsp->flags |= NFSMNT_DEADTHRESH;
290			break;
291		case 'd':
292			nfsargsp->flags |= NFSMNT_DUMBTIMR;
293			break;
294#if 0 /* XXXX */
295		case 'g':
296			num = strtol(optarg, &p, 10);
297			if (*p || num <= 0)
298				errx(1, "illegal -g value -- %s", optarg);
299			set_rpc_maxgrouplist(num);
300			nfsargsp->maxgrouplist = num;
301			nfsargsp->flags |= NFSMNT_MAXGRPS;
302			break;
303#endif
304		case 'I':
305			num = strtol(optarg, &p, 10);
306			if (*p || num <= 0)
307				errx(1, "illegal -I value -- %s", optarg);
308			nfsargsp->readdirsize = num;
309			nfsargsp->flags |= NFSMNT_READDIRSIZE;
310			break;
311		case 'i':
312			nfsargsp->flags |= NFSMNT_INT;
313			break;
314		case 'L':
315			nfsargsp->flags |= NFSMNT_NOLOCKD;
316			break;
317		case 'l':
318			nfsargsp->flags |= NFSMNT_RDIRPLUS;
319			break;
320		case 'N':
321			nfsargsp->flags &= ~NFSMNT_RESVPORT;
322			break;
323		case 'o':
324			altflags = 0;
325			set_flags(&altflags, &nfsargsp->flags, TRUE);
326			if (mountmode == V2)
327				altflags |= ALTF_NFSV2;
328			else if (mountmode == V3)
329				altflags |= ALTF_NFSV3;
330			getmntopts(optarg, mopts, &mntflags, &altflags);
331			set_flags(&altflags, &nfsargsp->flags, FALSE);
332			/*
333			 * Handle altflags which don't map directly to
334			 * mount flags.
335			 */
336			if (altflags & ALTF_BG)
337				opflags |= BGRND;
338			if (altflags & ALTF_NOINET4)
339				opflags |= OF_NOINET4;
340			if (altflags & ALTF_NOINET6)
341				opflags |= OF_NOINET6;
342			if (altflags & ALTF_MNTUDP)
343				mnttcp_ok = 0;
344			if (altflags & ALTF_TCP) {
345				nfsargsp->sotype = SOCK_STREAM;
346				nfsproto = IPPROTO_TCP;
347			}
348			if (altflags & ALTF_PORT) {
349				/*
350				 * XXX Converting from a string to an int
351				 * and back again is silly, and we should
352				 * allow /etc/services names.
353				 */
354				p = strstr(optarg, "port=");
355				if (p) {
356					asprintf(&portspec, "%d",
357					    atoi(p + 5));
358					if (portspec == NULL)
359						err(1, "asprintf");
360				}
361			}
362			mountmode = ANY;
363			if (altflags & ALTF_NFSV2)
364				mountmode = V2;
365			if (altflags & ALTF_NFSV3)
366				mountmode = V3;
367			if (altflags & ALTF_ACREGMIN) {
368				p = strstr(optarg, "acregmin=");
369				if (p)
370					nfsargsp->acregmin = atoi(p + 9);
371			}
372			if (altflags & ALTF_ACREGMAX) {
373				p = strstr(optarg, "acregmax=");
374				if (p)
375					nfsargsp->acregmax = atoi(p + 9);
376			}
377			if (altflags & ALTF_ACDIRMIN) {
378				p = strstr(optarg, "acdirmin=");
379				if (p)
380					nfsargsp->acdirmin = atoi(p + 9);
381			}
382			if (altflags & ALTF_ACDIRMAX) {
383				p = strstr(optarg, "acdirmax=");
384				if (p)
385					nfsargsp->acdirmax = atoi(p + 9);
386			}
387			break;
388		case 'P':
389			/* obsolete for NFSMNT_RESVPORT, now default */
390			break;
391		case 'R':
392			num = strtol(optarg, &p, 10);
393			if (*p || num < 0)
394				errx(1, "illegal -R value -- %s", optarg);
395			retrycnt = num;
396			break;
397		case 'r':
398			num = strtol(optarg, &p, 10);
399			if (*p || num <= 0)
400				errx(1, "illegal -r value -- %s", optarg);
401			nfsargsp->rsize = num;
402			nfsargsp->flags |= NFSMNT_RSIZE;
403			break;
404		case 's':
405			nfsargsp->flags |= NFSMNT_SOFT;
406			break;
407		case 'T':
408			nfsargsp->sotype = SOCK_STREAM;
409			nfsproto = IPPROTO_TCP;
410			break;
411		case 't':
412			num = strtol(optarg, &p, 10);
413			if (*p || num <= 0)
414				errx(1, "illegal -t value -- %s", optarg);
415			nfsargsp->timeo = num;
416			nfsargsp->flags |= NFSMNT_TIMEO;
417			break;
418		case 'w':
419			num = strtol(optarg, &p, 10);
420			if (*p || num <= 0)
421				errx(1, "illegal -w value -- %s", optarg);
422			nfsargsp->wsize = num;
423			nfsargsp->flags |= NFSMNT_WSIZE;
424			break;
425		case 'x':
426			num = strtol(optarg, &p, 10);
427			if (*p || num <= 0)
428				errx(1, "illegal -x value -- %s", optarg);
429			nfsargsp->retrans = num;
430			nfsargsp->flags |= NFSMNT_RETRANS;
431			break;
432		case 'U':
433			mnttcp_ok = 0;
434			break;
435		default:
436			usage();
437			break;
438		}
439	argc -= optind;
440	argv += optind;
441
442	if (argc != 2) {
443		usage();
444		/* NOTREACHED */
445	}
446
447	spec = *argv++;
448	name = *argv;
449
450	if (retrycnt == -1)
451		/* The default is to keep retrying forever. */
452		retrycnt = 0;
453	if (!getnfsargs(spec, nfsargsp))
454		exit(1);
455
456	/* resolve the mountpoint with realpath(3) */
457	(void)checkpath(name, mntpath);
458
459	if (mount("nfs", mntpath, mntflags, nfsargsp))
460		err(1, "%s", mntpath);
461
462	exit(0);
463}
464
465int
466getnfsargs(spec, nfsargsp)
467	char *spec;
468	struct nfs_args *nfsargsp;
469{
470	struct addrinfo hints, *ai_nfs, *ai;
471	enum tryret ret;
472	int ecode, speclen, remoteerr;
473	char *hostp, *delimp, *errstr;
474	size_t len;
475	static char nam[MNAMELEN + 1];
476
477	if ((delimp = strrchr(spec, ':')) != NULL) {
478		hostp = spec;
479		spec = delimp + 1;
480	} else if ((delimp = strrchr(spec, '@')) != NULL) {
481		warnx("path@server syntax is deprecated, use server:path");
482		hostp = delimp + 1;
483	} else {
484		warnx("no <host>:<dirpath> nfs-name");
485		return (0);
486	}
487	*delimp = '\0';
488
489	/*
490	 * If there has been a trailing slash at mounttime it seems
491	 * that some mountd implementations fail to remove the mount
492	 * entries from their mountlist while unmounting.
493	 */
494	for (speclen = strlen(spec);
495		speclen > 1 && spec[speclen - 1] == '/';
496		speclen--)
497		spec[speclen - 1] = '\0';
498	if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
499		warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
500		return (0);
501	}
502	/* Make both '@' and ':' notations equal */
503	if (*hostp != '\0') {
504		len = strlen(hostp);
505		memmove(nam, hostp, len);
506		nam[len] = ':';
507		memmove(nam + len + 1, spec, speclen);
508		nam[len + speclen + 1] = '\0';
509	}
510
511	/*
512	 * Handle an internet host address.
513	 */
514	memset(&hints, 0, sizeof hints);
515	hints.ai_flags = AI_NUMERICHOST;
516	hints.ai_socktype = nfsargsp->sotype;
517	if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
518		hints.ai_flags = 0;
519		if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
520		    != 0) {
521			if (portspec == NULL)
522				errx(1, "%s: %s", hostp, gai_strerror(ecode));
523			else
524				errx(1, "%s:%s: %s", hostp, portspec,
525				    gai_strerror(ecode));
526			return (0);
527		}
528	}
529
530	ret = TRYRET_LOCALERR;
531	for (;;) {
532		/*
533		 * Try each entry returned by getaddrinfo(). Note the
534		 * occurence of remote errors by setting `remoteerr'.
535		 */
536		remoteerr = 0;
537		for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
538			if ((ai->ai_family == AF_INET6) &&
539			    (opflags & OF_NOINET6))
540				continue;
541			if ((ai->ai_family == AF_INET) &&
542			    (opflags & OF_NOINET4))
543				continue;
544			ret = nfs_tryproto(nfsargsp, ai, hostp, spec, &errstr);
545			if (ret == TRYRET_SUCCESS)
546				break;
547			if (ret != TRYRET_LOCALERR)
548				remoteerr = 1;
549			if ((opflags & ISBGRND) == 0)
550				fprintf(stderr, "%s\n", errstr);
551		}
552		if (ret == TRYRET_SUCCESS)
553			break;
554
555		/* Exit if all errors were local. */
556		if (!remoteerr)
557			exit(1);
558
559		/*
560		 * If retrycnt == 0, we are to keep retrying forever.
561		 * Otherwise decrement it, and exit if it hits zero.
562		 */
563		if (retrycnt != 0 && --retrycnt == 0)
564			exit(1);
565
566		if ((opflags & (BGRND | ISBGRND)) == BGRND) {
567			warnx("Cannot immediately mount %s:%s, backgrounding",
568			    hostp, spec);
569			opflags |= ISBGRND;
570			if (daemon(0, 0) != 0)
571				err(1, "daemon");
572		}
573		sleep(60);
574	}
575	freeaddrinfo(ai_nfs);
576	nfsargsp->hostname = nam;
577	/* Add mounted file system to PATH_MOUNTTAB */
578	if (!add_mtab(hostp, spec))
579		warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
580	return (1);
581}
582
583/*
584 * Try to set up the NFS arguments according to the address
585 * family, protocol (and possibly port) specified in `ai'.
586 *
587 * Returns TRYRET_SUCCESS if successful, or:
588 *   TRYRET_TIMEOUT		The server did not respond.
589 *   TRYRET_REMOTEERR		The server reported an error.
590 *   TRYRET_LOCALERR		Local failure.
591 *
592 * In all error cases, *errstr will be set to a statically-allocated string
593 * describing the error.
594 */
595enum tryret
596nfs_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai, char *hostp,
597    char *spec, char **errstr)
598{
599	static char errbuf[256];
600	struct sockaddr_storage nfs_ss;
601	struct netbuf nfs_nb;
602	struct nfhret nfhret;
603	struct timeval try;
604	struct rpc_err rpcerr;
605	CLIENT *clp;
606	struct netconfig *nconf, *nconf_mnt;
607	char *netid, *netid_mnt;
608	int doconnect, nfsvers, mntvers;
609	enum clnt_stat stat;
610	enum mountmode trymntmode;
611
612	trymntmode = mountmode;
613	errbuf[0] = '\0';
614	*errstr = errbuf;
615
616	if ((netid = netidbytype(ai->ai_family, nfsargsp->sotype)) == NULL) {
617		snprintf(errbuf, sizeof errbuf,
618		    "af %d sotype %d not supported", ai->ai_family,
619		    nfsargsp->sotype);
620		return (TRYRET_LOCALERR);
621	}
622	if ((nconf = getnetconf_cached(netid)) == NULL) {
623		snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
624		return (TRYRET_LOCALERR);
625	}
626	/* The RPCPROG_MNT netid may be different. */
627	if (mnttcp_ok) {
628		netid_mnt = netid;
629		nconf_mnt = nconf;
630	} else {
631		if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
632		     == NULL) {
633			snprintf(errbuf, sizeof errbuf,
634			    "af %d sotype SOCK_DGRAM not supported",
635			     ai->ai_family);
636			return (TRYRET_LOCALERR);
637		}
638		if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
639			snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
640			    nc_sperror());
641			return (TRYRET_LOCALERR);
642		}
643	}
644
645tryagain:
646	if (trymntmode == V2) {
647		nfsvers = 2;
648		mntvers = 1;
649	} else {
650		nfsvers = 3;
651		mntvers = 3;
652	}
653
654	if (portspec != NULL) {
655		/* `ai' contains the complete nfsd sockaddr. */
656		nfs_nb.buf = ai->ai_addr;
657		nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
658	} else {
659		/* Ask the remote rpcbind. */
660		nfs_nb.buf = &nfs_ss;
661		nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
662
663		if (!rpcb_getaddr(RPCPROG_NFS, nfsvers, nconf, &nfs_nb,
664		    hostp)) {
665			if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
666			    trymntmode == ANY) {
667				trymntmode = V2;
668				goto tryagain;
669			}
670			snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
671			    netid, hostp, spec,
672			    clnt_spcreateerror("RPCPROG_NFS"));
673			return (returncode(rpc_createerr.cf_stat,
674			    &rpc_createerr.cf_error));
675		}
676	}
677
678	/* Check that the server (nfsd) responds on the port we have chosen. */
679	clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, RPCPROG_NFS, nfsvers,
680	    0, 0);
681	if (clp == NULL) {
682		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
683		    hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
684		return (returncode(rpc_createerr.cf_stat,
685		    &rpc_createerr.cf_error));
686	}
687	if (nfsargsp->sotype == SOCK_DGRAM &&
688	    !(nfsargsp->flags & NFSMNT_NOCONN)) {
689		/*
690		 * Use connect(), to match what the kernel does. This
691		 * catches cases where the server responds from the
692		 * wrong source address.
693		 */
694		doconnect = 1;
695		if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
696			clnt_destroy(clp);
697			snprintf(errbuf, sizeof errbuf,
698			    "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
699			    spec);
700			return (TRYRET_LOCALERR);
701		}
702	}
703
704	try.tv_sec = 10;
705	try.tv_usec = 0;
706	stat = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
707			 (xdrproc_t)xdr_void, NULL,
708	    try);
709	if (stat != RPC_SUCCESS) {
710		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
711			clnt_destroy(clp);
712			trymntmode = V2;
713			goto tryagain;
714		}
715		clnt_geterr(clp, &rpcerr);
716		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
717		    hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
718		clnt_destroy(clp);
719		return (returncode(stat, &rpcerr));
720	}
721	clnt_destroy(clp);
722
723	/* Send the RPCMNT_MOUNT RPC to get the root filehandle. */
724	try.tv_sec = 10;
725	try.tv_usec = 0;
726	clp = clnt_tp_create(hostp, RPCPROG_MNT, mntvers, nconf_mnt);
727	if (clp == NULL) {
728		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
729		    hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
730		return (returncode(rpc_createerr.cf_stat,
731		    &rpc_createerr.cf_error));
732	}
733	clp->cl_auth = authsys_create_default();
734	nfhret.auth = RPCAUTH_UNIX;
735	nfhret.vers = mntvers;
736	stat = clnt_call(clp, RPCMNT_MOUNT, (xdrproc_t)xdr_dir, spec,
737			 (xdrproc_t)xdr_fh, &nfhret,
738	    try);
739	auth_destroy(clp->cl_auth);
740	if (stat != RPC_SUCCESS) {
741		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
742			clnt_destroy(clp);
743			trymntmode = V2;
744			goto tryagain;
745		}
746		clnt_geterr(clp, &rpcerr);
747		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
748		    hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
749		clnt_destroy(clp);
750		return (returncode(stat, &rpcerr));
751	}
752	clnt_destroy(clp);
753
754	if (nfhret.stat != 0) {
755		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
756		    hostp, spec, strerror(nfhret.stat));
757		return (TRYRET_REMOTEERR);
758	}
759
760	/*
761	 * Store the filehandle and server address in nfsargsp, making
762	 * sure to copy any locally allocated structures.
763	 */
764	nfsargsp->addrlen = nfs_nb.len;
765	nfsargsp->addr = malloc(nfsargsp->addrlen);
766	nfsargsp->fhsize = nfhret.fhsize;
767	nfsargsp->fh = malloc(nfsargsp->fhsize);
768	if (nfsargsp->addr == NULL || nfsargsp->fh == NULL)
769		err(1, "malloc");
770	bcopy(nfs_nb.buf, nfsargsp->addr, nfsargsp->addrlen);
771	bcopy(nfhret.nfh, nfsargsp->fh, nfsargsp->fhsize);
772
773	if (nfsvers == 3)
774		nfsargsp->flags |= NFSMNT_NFSV3;
775	else
776		nfsargsp->flags &= ~NFSMNT_NFSV3;
777
778	return (TRYRET_SUCCESS);
779}
780
781
782/*
783 * Catagorise a RPC return status and error into an `enum tryret'
784 * return code.
785 */
786enum tryret
787returncode(enum clnt_stat stat, struct rpc_err *rpcerr)
788{
789	switch (stat) {
790	case RPC_TIMEDOUT:
791		return (TRYRET_TIMEOUT);
792	case RPC_PMAPFAILURE:
793	case RPC_PROGNOTREGISTERED:
794	case RPC_PROGVERSMISMATCH:
795	/* XXX, these can be local or remote. */
796	case RPC_CANTSEND:
797	case RPC_CANTRECV:
798		return (TRYRET_REMOTEERR);
799	case RPC_SYSTEMERROR:
800		switch (rpcerr->re_errno) {
801		case ETIMEDOUT:
802			return (TRYRET_TIMEOUT);
803		case ENOMEM:
804			break;
805		default:
806			return (TRYRET_REMOTEERR);
807		}
808		/* FALLTHROUGH */
809	default:
810		break;
811	}
812	return (TRYRET_LOCALERR);
813}
814
815/*
816 * Look up a netid based on an address family and socket type.
817 * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
818 *
819 * XXX there should be a library function for this.
820 */
821char *
822netidbytype(int af, int sotype) {
823	struct nc_protos *p;
824
825	for (p = nc_protos; p->netid != NULL; p++) {
826		if (af != p->af || sotype != p->sotype)
827			continue;
828		return (p->netid);
829	}
830	return (NULL);
831}
832
833/*
834 * Look up a netconfig entry based on a netid, and cache the result so
835 * that we don't need to remember to call freenetconfigent().
836 *
837 * Otherwise it behaves just like getnetconfigent(), so nc_*error()
838 * work on failure.
839 */
840struct netconfig *
841getnetconf_cached(const char *netid) {
842	static struct nc_entry {
843		struct netconfig *nconf;
844		struct nc_entry *next;
845	} *head;
846	struct nc_entry *p;
847	struct netconfig *nconf;
848
849	for (p = head; p != NULL; p = p->next)
850		if (strcmp(netid, p->nconf->nc_netid) == 0)
851			return (p->nconf);
852
853	if ((nconf = getnetconfigent(netid)) == NULL)
854		return (NULL);
855	if ((p = malloc(sizeof(*p))) == NULL)
856		err(1, "malloc");
857	p->nconf = nconf;
858	p->next = head;
859	head = p;
860
861	return (p->nconf);
862}
863
864/*
865 * xdr routines for mount rpc's
866 */
867int
868xdr_dir(xdrsp, dirp)
869	XDR *xdrsp;
870	char *dirp;
871{
872	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
873}
874
875int
876xdr_fh(xdrsp, np)
877	XDR *xdrsp;
878	struct nfhret *np;
879{
880	int i;
881	long auth, authcnt, authfnd = 0;
882
883	if (!xdr_u_long(xdrsp, &np->stat))
884		return (0);
885	if (np->stat)
886		return (1);
887	switch (np->vers) {
888	case 1:
889		np->fhsize = NFSX_V2FH;
890		return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
891	case 3:
892		if (!xdr_long(xdrsp, &np->fhsize))
893			return (0);
894		if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
895			return (0);
896		if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
897			return (0);
898		if (!xdr_long(xdrsp, &authcnt))
899			return (0);
900		for (i = 0; i < authcnt; i++) {
901			if (!xdr_long(xdrsp, &auth))
902				return (0);
903			if (auth == np->auth)
904				authfnd++;
905		}
906		/*
907		 * Some servers, such as DEC's OSF/1 return a nil authenticator
908		 * list to indicate RPCAUTH_UNIX.
909		 */
910		if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
911			np->stat = EAUTH;
912		return (1);
913	};
914	return (0);
915}
916
917void
918usage()
919{
920	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
921"usage: mount_nfs [-23bcdiLlNPsTU] [-a maxreadahead] [-D deadthresh]",
922"                 [-g maxgroups] [-I readdirsize] [-o options] [-R retrycnt]",
923"                 [-r readsize] [-t timeout] [-w writesize] [-x retrans]",
924"                 rhost:path node");
925	exit(1);
926}
927