mount_nfs.c revision 86284 
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
37#ifndef lint
38static const char copyright[] =
39"@(#) Copyright (c) 1992, 1993, 1994\n\
40	The Regents of the University of California.  All rights reserved.\n";
41#endif /* not lint */
42
43#ifndef lint
44#if 0
45static char sccsid[] = "@(#)mount_nfs.c	8.11 (Berkeley) 5/4/95";
46#endif
47static const char rcsid[] =
48  "$FreeBSD: head/sbin/mount_nfs/mount_nfs.c 86284 2001-11-12 02:33:52Z alfred $";
49#endif /* not lint */
50
51#include <sys/param.h>
52#include <sys/mount.h>
53#include <sys/socket.h>
54#include <sys/stat.h>
55#include <sys/syslog.h>
56
57#include <rpc/rpc.h>
58#include <rpc/pmap_clnt.h>
59#include <rpc/pmap_prot.h>
60
61#include <nfs/rpcv2.h>
62#include <nfs/nfsproto.h>
63#include <nfsclient/nfs.h>
64#include <nfsclient/nfsargs.h>
65
66#include <arpa/inet.h>
67
68#include <ctype.h>
69#include <err.h>
70#include <errno.h>
71#include <fcntl.h>
72#include <netdb.h>
73#include <stdio.h>
74#include <stdlib.h>
75#include <strings.h>
76#include <sysexits.h>
77#include <unistd.h>
78
79#include "mntopts.h"
80#include "mounttab.h"
81
82#define	ALTF_BG		0x1
83#define ALTF_NOCONN	0x2
84#define ALTF_DUMBTIMR	0x4
85#define ALTF_INTR	0x8
86#define ALTF_NFSV3	0x20
87#define ALTF_RDIRPLUS	0x40
88#define ALTF_MNTUDP	0x80
89#define ALTF_RESVPORT	0x100
90#define ALTF_SEQPACKET	0x200
91#define ALTF_SOFT	0x800
92#define ALTF_TCP	0x1000
93#define ALTF_PORT	0x2000
94#define ALTF_NFSV2	0x4000
95#define ALTF_ACREGMIN	0x8000
96#define ALTF_ACREGMAX	0x10000
97#define ALTF_ACDIRMIN	0x20000
98#define ALTF_ACDIRMAX	0x40000
99#define ALTF_NOLOCKD	0x80000
100
101struct mntopt mopts[] = {
102	MOPT_STDOPTS,
103	MOPT_FORCE,
104	MOPT_UPDATE,
105	MOPT_ASYNC,
106	{ "bg", 0, ALTF_BG, 1 },
107	{ "conn", 1, ALTF_NOCONN, 1 },
108	{ "dumbtimer", 0, ALTF_DUMBTIMR, 1 },
109	{ "intr", 0, ALTF_INTR, 1 },
110	{ "nfsv3", 0, ALTF_NFSV3, 1 },
111	{ "rdirplus", 0, ALTF_RDIRPLUS, 1 },
112	{ "mntudp", 0, ALTF_MNTUDP, 1 },
113	{ "resvport", 0, ALTF_RESVPORT, 1 },
114	{ "soft", 0, ALTF_SOFT, 1 },
115	{ "tcp", 0, ALTF_TCP, 1 },
116	{ "port=", 0, ALTF_PORT, 1 },
117	{ "nfsv2", 0, ALTF_NFSV2, 1 },
118	{ "acregmin=", 0, ALTF_ACREGMIN, 1 },
119	{ "acregmax=", 0, ALTF_ACREGMAX, 1 },
120	{ "acdirmin=", 0, ALTF_ACDIRMIN, 1 },
121	{ "acdirmax=", 0, ALTF_ACDIRMAX, 1 },
122	{ "lockd", 1, ALTF_NOLOCKD, 1 },
123	{ NULL }
124};
125
126struct nfs_args nfsdefargs = {
127	NFS_ARGSVERSION,
128	(struct sockaddr *)0,
129	sizeof (struct sockaddr_in),
130	SOCK_DGRAM,
131	0,
132	(u_char *)0,
133	0,
134	NFSMNT_RESVPORT,
135	NFS_WSIZE,
136	NFS_RSIZE,
137	NFS_READDIRSIZE,
138	10,
139	NFS_RETRANS,
140	NFS_MAXGRPS,
141	NFS_DEFRAHEAD,
142	0,			/* was: NQ_DEFLEASE */
143	NFS_MAXDEADTHRESH,	/* was: NQ_DEADTHRESH */
144	(char *)0,
145	/* args version 4 */
146	NFS_MINATTRTIMO,
147	NFS_MAXATTRTIMO,
148	NFS_MINDIRATTRTIMO,
149	NFS_MAXDIRATTRTIMO,
150};
151
152/* Table for af,sotype -> netid conversions. */
153struct nc_protos {
154	char *netid;
155	int af;
156	int sotype;
157} nc_protos[] = {
158	{"udp",		AF_INET,	SOCK_DGRAM},
159	{"tcp",		AF_INET,	SOCK_STREAM},
160	{"udp6",	AF_INET6,	SOCK_DGRAM},
161	{"tcp6",	AF_INET6,	SOCK_STREAM},
162	{NULL}
163};
164
165struct nfhret {
166	u_long		stat;
167	long		vers;
168	long		auth;
169	long		fhsize;
170	u_char		nfh[NFSX_V3FHMAX];
171};
172#define	BGRND	1
173#define	ISBGRND	2
174int retrycnt = -1;
175int opflags = 0;
176int nfsproto = IPPROTO_UDP;
177int mnttcp_ok = 1;
178char *portspec = NULL;	/* Server nfs port; NULL means look up via rpcbind. */
179enum mountmode {
180	ANY,
181	V2,
182	V3
183} mountmode = ANY;
184
185/* Return codes for nfs_tryproto. */
186enum tryret {
187	TRYRET_SUCCESS,
188	TRYRET_TIMEOUT,		/* No response received. */
189	TRYRET_REMOTEERR,	/* Error received from remote server. */
190	TRYRET_LOCALERR		/* Local failure. */
191};
192
193int	getnfsargs __P((char *, struct nfs_args *));
194/* void	set_rpc_maxgrouplist __P((int)); */
195struct netconfig *getnetconf_cached(const char *netid);
196char	*netidbytype(int af, int sotype);
197void	usage __P((void)) __dead2;
198int	xdr_dir __P((XDR *, char *));
199int	xdr_fh __P((XDR *, struct nfhret *));
200enum tryret nfs_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai,
201    char *hostp, char *spec, char **errstr);
202enum tryret returncode(enum clnt_stat stat, struct rpc_err *rpcerr);
203
204/*
205 * Used to set mount flags with getmntopts.  Call with dir=TRUE to
206 * initialize altflags from the current mount flags.  Call with
207 * dir=FALSE to update mount flags with the new value of altflags after
208 * the call to getmntopts.
209 */
210static void
211set_flags(int* altflags, int* nfsflags, int dir)
212{
213#define F2(af, nf)					\
214	if (dir) {					\
215		if (*nfsflags & NFSMNT_##nf)		\
216			*altflags |= ALTF_##af;		\
217		else					\
218			*altflags &= ~ALTF_##af;	\
219	} else {					\
220		if (*altflags & ALTF_##af)		\
221			*nfsflags |= NFSMNT_##nf;	\
222		else					\
223			*nfsflags &= ~NFSMNT_##nf;	\
224	}
225#define F(f)	F2(f,f)
226
227	F(NOCONN);
228	F(DUMBTIMR);
229	F2(INTR, INT);
230	F(RDIRPLUS);
231	F(RESVPORT);
232	F(SOFT);
233	F(NOLOCKD);
234
235#undef F
236#undef F2
237}
238
239int
240main(argc, argv)
241	int argc;
242	char *argv[];
243{
244	register int c;
245	register struct nfs_args *nfsargsp;
246	struct nfs_args nfsargs;
247	int mntflags, altflags, nfssvc_flag, num;
248	char *name, *p, *spec;
249	char mntpath[MAXPATHLEN];
250	struct vfsconf vfc;
251	int error = 0;
252
253	mntflags = 0;
254	altflags = 0;
255	nfsargs = nfsdefargs;
256	nfsargsp = &nfsargs;
257	while ((c = getopt(argc, argv,
258	    "23a:bcdD:g:I:iLl:No:PpR:r:sTt:w:x:U")) != -1)
259		switch (c) {
260		case '2':
261			mountmode = V2;
262			break;
263		case '3':
264			mountmode = V3;
265			break;
266		case 'a':
267			num = strtol(optarg, &p, 10);
268			if (*p || num < 0)
269				errx(1, "illegal -a value -- %s", optarg);
270			nfsargsp->readahead = num;
271			nfsargsp->flags |= NFSMNT_READAHEAD;
272			break;
273		case 'b':
274			opflags |= BGRND;
275			break;
276		case 'c':
277			nfsargsp->flags |= NFSMNT_NOCONN;
278			break;
279		case 'D':
280			num = strtol(optarg, &p, 10);
281			if (*p || num <= 0)
282				errx(1, "illegal -D value -- %s", optarg);
283			nfsargsp->deadthresh = num;
284			nfsargsp->flags |= NFSMNT_DEADTHRESH;
285			break;
286		case 'd':
287			nfsargsp->flags |= NFSMNT_DUMBTIMR;
288			break;
289#if 0 /* XXXX */
290		case 'g':
291			num = strtol(optarg, &p, 10);
292			if (*p || num <= 0)
293				errx(1, "illegal -g value -- %s", optarg);
294			set_rpc_maxgrouplist(num);
295			nfsargsp->maxgrouplist = num;
296			nfsargsp->flags |= NFSMNT_MAXGRPS;
297			break;
298#endif
299		case 'I':
300			num = strtol(optarg, &p, 10);
301			if (*p || num <= 0)
302				errx(1, "illegal -I value -- %s", optarg);
303			nfsargsp->readdirsize = num;
304			nfsargsp->flags |= NFSMNT_READDIRSIZE;
305			break;
306		case 'i':
307			nfsargsp->flags |= NFSMNT_INT;
308			break;
309		case 'L':
310			nfsargsp->flags |= NFSMNT_NOLOCKD;
311			break;
312		case 'l':
313			nfsargsp->flags |= NFSMNT_RDIRPLUS;
314			break;
315		case 'N':
316			nfsargsp->flags &= ~NFSMNT_RESVPORT;
317			break;
318		case 'o':
319			altflags = 0;
320			set_flags(&altflags, &nfsargsp->flags, TRUE);
321			if (mountmode == V2)
322				altflags |= ALTF_NFSV2;
323			else if (mountmode == V3)
324				altflags |= ALTF_NFSV3;
325			getmntopts(optarg, mopts, &mntflags, &altflags);
326			set_flags(&altflags, &nfsargsp->flags, FALSE);
327			/*
328			 * Handle altflags which don't map directly to
329			 * mount flags.
330			 */
331			if(altflags & ALTF_BG)
332				opflags |= BGRND;
333			if(altflags & ALTF_MNTUDP)
334				mnttcp_ok = 0;
335			if(altflags & ALTF_TCP) {
336				nfsargsp->sotype = SOCK_STREAM;
337				nfsproto = IPPROTO_TCP;
338			}
339			if(altflags & ALTF_PORT) {
340				/*
341				 * XXX Converting from a string to an int
342				 * and back again is silly, and we should
343				 * allow /etc/services names.
344				 */
345				asprintf(&portspec, "%d",
346				    atoi(strstr(optarg, "port=") + 5));
347				if (portspec == NULL)
348					err(1, "asprintf");
349			}
350			mountmode = ANY;
351			if(altflags & ALTF_NFSV2)
352				mountmode = V2;
353			if(altflags & ALTF_NFSV3)
354				mountmode = V3;
355			if(altflags & ALTF_ACREGMIN)
356				nfsargsp->acregmin = atoi(strstr(optarg,
357				    "acregmin=") + 9);
358			if(altflags & ALTF_ACREGMAX)
359				nfsargsp->acregmax = atoi(strstr(optarg,
360				    "acregmax=") + 9);
361			if(altflags & ALTF_ACDIRMIN)
362				nfsargsp->acdirmin = atoi(strstr(optarg,
363				    "acdirmin=") + 9);
364			if(altflags & ALTF_ACDIRMAX)
365				nfsargsp->acdirmax = atoi(strstr(optarg,
366				    "acdirmax=") + 9);
367			break;
368		case 'P':
369			/* obsolete for NFSMNT_RESVPORT, now default */
370			break;
371		case 'R':
372			num = strtol(optarg, &p, 10);
373			if (*p || num < 0)
374				errx(1, "illegal -R value -- %s", optarg);
375			retrycnt = num;
376			break;
377		case 'r':
378			num = strtol(optarg, &p, 10);
379			if (*p || num <= 0)
380				errx(1, "illegal -r value -- %s", optarg);
381			nfsargsp->rsize = num;
382			nfsargsp->flags |= NFSMNT_RSIZE;
383			break;
384		case 's':
385			nfsargsp->flags |= NFSMNT_SOFT;
386			break;
387		case 'T':
388			nfsargsp->sotype = SOCK_STREAM;
389			nfsproto = IPPROTO_TCP;
390			break;
391		case 't':
392			num = strtol(optarg, &p, 10);
393			if (*p || num <= 0)
394				errx(1, "illegal -t value -- %s", optarg);
395			nfsargsp->timeo = num;
396			nfsargsp->flags |= NFSMNT_TIMEO;
397			break;
398		case 'w':
399			num = strtol(optarg, &p, 10);
400			if (*p || num <= 0)
401				errx(1, "illegal -w value -- %s", optarg);
402			nfsargsp->wsize = num;
403			nfsargsp->flags |= NFSMNT_WSIZE;
404			break;
405		case 'x':
406			num = strtol(optarg, &p, 10);
407			if (*p || num <= 0)
408				errx(1, "illegal -x value -- %s", optarg);
409			nfsargsp->retrans = num;
410			nfsargsp->flags |= NFSMNT_RETRANS;
411			break;
412		case 'U':
413			mnttcp_ok = 0;
414			break;
415		default:
416			usage();
417			break;
418		}
419	argc -= optind;
420	argv += optind;
421
422	if (argc != 2) {
423		usage();
424		/* NOTREACHED */
425	}
426
427	spec = *argv++;
428	name = *argv;
429
430	if (retrycnt == -1)
431		/* The default is to keep retrying forever. */
432		retrycnt = 0;
433	if (!getnfsargs(spec, nfsargsp))
434		exit(1);
435
436	/* resolve the mountpoint with realpath(3) */
437	(void)checkpath(name, mntpath);
438
439	error = getvfsbyname("nfs", &vfc);
440	if (error && vfsisloadable("nfs")) {
441		if(vfsload("nfs"))
442			err(EX_OSERR, "vfsload(nfs)");
443		endvfsent();	/* clear cache */
444		error = getvfsbyname("nfs", &vfc);
445	}
446	if (error)
447		errx(EX_OSERR, "nfs filesystem is not available");
448
449	if (mount(vfc.vfc_name, mntpath, mntflags, nfsargsp))
450		err(1, "%s", mntpath);
451
452	exit(0);
453}
454
455int
456getnfsargs(spec, nfsargsp)
457	char *spec;
458	struct nfs_args *nfsargsp;
459{
460	struct addrinfo hints, *ai_nfs, *ai;
461	enum tryret ret;
462	int ecode, speclen, remoteerr;
463	char *hostp, *delimp, *errstr;
464	size_t len;
465	static char nam[MNAMELEN + 1];
466
467	if ((delimp = strrchr(spec, ':')) != NULL) {
468		hostp = spec;
469		spec = delimp + 1;
470	} else if ((delimp = strrchr(spec, '@')) != NULL) {
471		warnx("path@server syntax is deprecated, use server:path");
472		hostp = delimp + 1;
473	} else {
474		warnx("no <host>:<dirpath> nfs-name");
475		return (0);
476	}
477	*delimp = '\0';
478
479	/*
480	 * If there has been a trailing slash at mounttime it seems
481	 * that some mountd implementations fail to remove the mount
482	 * entries from their mountlist while unmounting.
483	 */
484	for (speclen = strlen(spec);
485		speclen > 1 && spec[speclen - 1] == '/';
486		speclen--)
487		spec[speclen - 1] = '\0';
488	if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
489		warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
490		return (0);
491	}
492	/* Make both '@' and ':' notations equal */
493	if (*hostp != '\0') {
494		len = strlen(hostp);
495		memmove(nam, hostp, len);
496		nam[len] = ':';
497		memmove(nam + len + 1, spec, speclen);
498		nam[len + speclen + 1] = '\0';
499	}
500
501	/*
502	 * Handle an internet host address.
503	 */
504	memset(&hints, 0, sizeof hints);
505	hints.ai_flags = AI_NUMERICHOST;
506	hints.ai_socktype = nfsargsp->sotype;
507	if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
508		hints.ai_flags = 0;
509		if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
510		    != 0) {
511			if (portspec == NULL)
512				errx(1, "%s: %s", hostp, gai_strerror(ecode));
513			else
514				errx(1, "%s:%s: %s", hostp, portspec,
515				    gai_strerror(ecode));
516			return (0);
517		}
518	}
519
520	ret = TRYRET_LOCALERR;
521	for (;;) {
522		/*
523		 * Try each entry returned by getaddrinfo(). Note the
524		 * occurence of remote errors by setting `remoteerr'.
525		 */
526		remoteerr = 0;
527		for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
528			ret = nfs_tryproto(nfsargsp, ai, hostp, spec, &errstr);
529			if (ret == TRYRET_SUCCESS)
530				break;
531			if (ret != TRYRET_LOCALERR)
532				remoteerr = 1;
533			if ((opflags & ISBGRND) == 0)
534				fprintf(stderr, "%s\n", errstr);
535		}
536		if (ret == TRYRET_SUCCESS)
537			break;
538
539		/* Exit if all errors were local. */
540		if (!remoteerr)
541			exit(1);
542
543		/*
544		 * If retrycnt == 0, we are to keep retrying forever.
545		 * Otherwise decrement it, and exit if it hits zero.
546		 */
547		if (retrycnt != 0 && --retrycnt == 0)
548			exit(1);
549
550		if ((opflags & (BGRND | ISBGRND)) == BGRND) {
551			warnx("Cannot immediately mount %s:%s, backgrounding",
552			    hostp, spec);
553			opflags |= ISBGRND;
554			if (daemon(0, 0) != 0)
555				err(1, "daemon");
556		}
557		sleep(60);
558	}
559	freeaddrinfo(ai_nfs);
560	nfsargsp->hostname = nam;
561	/* Add mounted filesystem to PATH_MOUNTTAB */
562	if (!add_mtab(hostp, spec))
563		warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
564	return (1);
565}
566
567/*
568 * Try to set up the NFS arguments according to the address
569 * family, protocol (and possibly port) specified in `ai'.
570 *
571 * Returns TRYRET_SUCCESS if successful, or:
572 *   TRYRET_TIMEOUT		The server did not respond.
573 *   TRYRET_REMOTEERR		The server reported an error.
574 *   TRYRET_LOCALERR		Local failure.
575 *
576 * In all error cases, *errstr will be set to a statically-allocated string
577 * describing the error.
578 */
579enum tryret
580nfs_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai, char *hostp,
581    char *spec, char **errstr)
582{
583	static char errbuf[256];
584	struct sockaddr_storage nfs_ss;
585	struct netbuf nfs_nb;
586	struct nfhret nfhret;
587	struct timeval try;
588	struct rpc_err rpcerr;
589	CLIENT *clp;
590	struct netconfig *nconf, *nconf_mnt;
591	char *netid, *netid_mnt;
592	int doconnect, nfsvers, mntvers;
593	enum clnt_stat stat;
594	enum mountmode trymntmode;
595
596	trymntmode = mountmode;
597	errbuf[0] = '\0';
598	*errstr = errbuf;
599
600	if ((netid = netidbytype(ai->ai_family, nfsargsp->sotype)) == NULL) {
601		snprintf(errbuf, sizeof errbuf,
602		    "af %d sotype %d not supported", ai->ai_family,
603		    nfsargsp->sotype);
604		return (TRYRET_LOCALERR);
605	}
606	if ((nconf = getnetconf_cached(netid)) == NULL) {
607		snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
608		return (TRYRET_LOCALERR);
609	}
610	/* The RPCPROG_MNT netid may be different. */
611	if (mnttcp_ok) {
612		netid_mnt = netid;
613		nconf_mnt = nconf;
614	} else {
615		if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
616		     == NULL) {
617			snprintf(errbuf, sizeof errbuf,
618			    "af %d sotype SOCK_DGRAM not supported",
619			     ai->ai_family);
620			return (TRYRET_LOCALERR);
621		}
622		if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
623			snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
624			    nc_sperror());
625			return (TRYRET_LOCALERR);
626		}
627	}
628
629tryagain:
630	if (trymntmode == V2) {
631		nfsvers = 2;
632		mntvers = 1;
633	} else {
634		nfsvers = 3;
635		mntvers = 3;
636	}
637
638	if (portspec != NULL) {
639		/* `ai' contains the complete nfsd sockaddr. */
640		nfs_nb.buf = ai->ai_addr;
641		nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
642	} else {
643		/* Ask the remote rpcbind. */
644		nfs_nb.buf = &nfs_ss;
645		nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
646
647		if (!rpcb_getaddr(RPCPROG_NFS, nfsvers, nconf, &nfs_nb,
648		    hostp)) {
649			if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
650			    trymntmode == ANY) {
651				trymntmode = V2;
652				goto tryagain;
653			}
654			snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
655			    netid, hostp, spec,
656			    clnt_spcreateerror("RPCPROG_NFS"));
657			return (returncode(rpc_createerr.cf_stat,
658			    &rpc_createerr.cf_error));
659		}
660	}
661
662	/* Check that the server (nfsd) responds on the port we have chosen. */
663	clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, RPCPROG_NFS, nfsvers,
664	    0, 0);
665	if (clp == NULL) {
666		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
667		    hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
668		return (returncode(rpc_createerr.cf_stat,
669		    &rpc_createerr.cf_error));
670	}
671	if (nfsargsp->sotype == SOCK_DGRAM) {
672		/*
673		 * Use connect(), to match what the kernel does. This
674		 * catches cases where the server responds from the
675		 * wrong source address.
676		 */
677		doconnect = 1;
678		if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
679			clnt_destroy(clp);
680			snprintf(errbuf, sizeof errbuf,
681			    "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
682			    spec);
683			return (TRYRET_LOCALERR);
684		}
685	}
686
687	try.tv_sec = 10;
688	try.tv_usec = 0;
689	stat = clnt_call(clp, NFSPROC_NULL, xdr_void, NULL, xdr_void, NULL,
690	    try);
691	if (stat != RPC_SUCCESS) {
692		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
693			clnt_destroy(clp);
694			trymntmode = V2;
695			goto tryagain;
696		}
697		clnt_geterr(clp, &rpcerr);
698		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
699		    hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
700		clnt_destroy(clp);
701		return (returncode(stat, &rpcerr));
702	}
703	clnt_destroy(clp);
704
705	/* Send the RPCMNT_MOUNT RPC to get the root filehandle. */
706	try.tv_sec = 10;
707	try.tv_usec = 0;
708	clp = clnt_tp_create(hostp, RPCPROG_MNT, mntvers, nconf_mnt);
709	if (clp == NULL) {
710		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
711		    hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
712		return (returncode(rpc_createerr.cf_stat,
713		    &rpc_createerr.cf_error));
714	}
715	clp->cl_auth = authsys_create_default();
716	nfhret.auth = RPCAUTH_UNIX;
717	nfhret.vers = mntvers;
718	stat = clnt_call(clp, RPCMNT_MOUNT, xdr_dir, spec, xdr_fh, &nfhret,
719	    try);
720	auth_destroy(clp->cl_auth);
721	if (stat != RPC_SUCCESS) {
722		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
723			clnt_destroy(clp);
724			trymntmode = V2;
725			goto tryagain;
726		}
727		clnt_geterr(clp, &rpcerr);
728		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
729		    hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
730		clnt_destroy(clp);
731		return (returncode(stat, &rpcerr));
732	}
733	clnt_destroy(clp);
734
735	if (nfhret.stat != 0) {
736		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
737		    hostp, spec, strerror(nfhret.stat));
738		return (TRYRET_REMOTEERR);
739	}
740
741	/*
742	 * Store the filehandle and server address in nfsargsp, making
743	 * sure to copy any locally allocated structures.
744	 */
745	nfsargsp->addrlen = nfs_nb.len;
746	nfsargsp->addr = malloc(nfsargsp->addrlen);
747	nfsargsp->fhsize = nfhret.fhsize;
748	nfsargsp->fh = malloc(nfsargsp->fhsize);
749	if (nfsargsp->addr == NULL || nfsargsp->fh == NULL)
750		err(1, "malloc");
751	bcopy(nfs_nb.buf, nfsargsp->addr, nfsargsp->addrlen);
752	bcopy(nfhret.nfh, nfsargsp->fh, nfsargsp->fhsize);
753
754	if (nfsvers == 3)
755		nfsargsp->flags |= NFSMNT_NFSV3;
756	else
757		nfsargsp->flags &= ~NFSMNT_NFSV3;
758
759	return (TRYRET_SUCCESS);
760}
761
762
763/*
764 * Catagorise a RPC return status and error into an `enum tryret'
765 * return code.
766 */
767enum tryret
768returncode(enum clnt_stat stat, struct rpc_err *rpcerr)
769{
770	switch (stat) {
771	case RPC_TIMEDOUT:
772		return (TRYRET_TIMEOUT);
773	case RPC_PMAPFAILURE:
774	case RPC_PROGNOTREGISTERED:
775	case RPC_PROGVERSMISMATCH:
776	/* XXX, these can be local or remote. */
777	case RPC_CANTSEND:
778	case RPC_CANTRECV:
779		return (TRYRET_REMOTEERR);
780	case RPC_SYSTEMERROR:
781		switch (rpcerr->re_errno) {
782		case ETIMEDOUT:
783			return (TRYRET_TIMEOUT);
784		case ENOMEM:
785			break;
786		default:
787			return (TRYRET_REMOTEERR);
788		}
789		/* FALLTHROUGH */
790	default:
791		break;
792	}
793	return (TRYRET_LOCALERR);
794}
795
796/*
797 * Look up a netid based on an address family and socket type.
798 * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
799 *
800 * XXX there should be a library function for this.
801 */
802char *
803netidbytype(int af, int sotype) {
804	struct nc_protos *p;
805
806	for (p = nc_protos; p->netid != NULL; p++) {
807		if (af != p->af || sotype != p->sotype)
808			continue;
809		return (p->netid);
810	}
811	return (NULL);
812}
813
814/*
815 * Look up a netconfig entry based on a netid, and cache the result so
816 * that we don't need to remember to call freenetconfigent().
817 *
818 * Otherwise it behaves just like getnetconfigent(), so nc_*error()
819 * work on failure.
820 */
821struct netconfig *
822getnetconf_cached(const char *netid) {
823	static struct nc_entry {
824		struct netconfig *nconf;
825		struct nc_entry *next;
826	} *head;
827	struct nc_entry *p;
828	struct netconfig *nconf;
829
830	for (p = head; p != NULL; p = p->next)
831		if (strcmp(netid, p->nconf->nc_netid) == 0)
832			return (p->nconf);
833
834	if ((nconf = getnetconfigent(netid)) == NULL)
835		return (NULL);
836	if ((p = malloc(sizeof(*p))) == NULL)
837		err(1, "malloc");
838	p->nconf = nconf;
839	p->next = head;
840	head = p;
841
842	return (p->nconf);
843}
844
845/*
846 * xdr routines for mount rpc's
847 */
848int
849xdr_dir(xdrsp, dirp)
850	XDR *xdrsp;
851	char *dirp;
852{
853	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
854}
855
856int
857xdr_fh(xdrsp, np)
858	XDR *xdrsp;
859	register struct nfhret *np;
860{
861	register int i;
862	long auth, authcnt, authfnd = 0;
863
864	if (!xdr_u_long(xdrsp, &np->stat))
865		return (0);
866	if (np->stat)
867		return (1);
868	switch (np->vers) {
869	case 1:
870		np->fhsize = NFSX_V2FH;
871		return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
872	case 3:
873		if (!xdr_long(xdrsp, &np->fhsize))
874			return (0);
875		if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
876			return (0);
877		if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
878			return (0);
879		if (!xdr_long(xdrsp, &authcnt))
880			return (0);
881		for (i = 0; i < authcnt; i++) {
882			if (!xdr_long(xdrsp, &auth))
883				return (0);
884			if (auth == np->auth)
885				authfnd++;
886		}
887		/*
888		 * Some servers, such as DEC's OSF/1 return a nil authenticator
889		 * list to indicate RPCAUTH_UNIX.
890		 */
891		if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
892			np->stat = EAUTH;
893		return (1);
894	};
895	return (0);
896}
897
898void
899usage()
900{
901	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
902"usage: mount_nfs [-23KNPTUbcdilqs] [-D deadthresh] [-I readdirsize]",
903"                 [-R retrycnt] [-a maxreadahead]",
904"                 [-g maxgroups] [-m realm] [-o options] [-r readsize]",
905"                 [-t timeout] [-w writesize] [-x retrans] rhost:path node");
906	exit(1);
907}
908