mount_nfs.c revision 61536 
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 61536 2000-06-11 05:19:58Z dillon $";
49#endif /* not lint */
50
51#include <sys/param.h>
52#include <sys/mount.h>
53#include <sys/stat.h>
54#include <sys/syslog.h>
55
56#include <rpc/rpc.h>
57#include <rpc/pmap_clnt.h>
58#include <rpc/pmap_prot.h>
59
60#ifdef NFSKERB
61#include <kerberosIV/des.h>
62#include <kerberosIV/krb.h>
63#endif
64
65#include <nfs/rpcv2.h>
66#include <nfs/nfsproto.h>
67#include <nfs/nfs.h>
68#include <nfs/nqnfs.h>
69
70#include <arpa/inet.h>
71
72#include <ctype.h>
73#include <err.h>
74#include <errno.h>
75#include <netdb.h>
76#include <stdio.h>
77#include <stdlib.h>
78#include <strings.h>
79#include <sysexits.h>
80#include <unistd.h>
81
82#include "mntopts.h"
83#include "mounttab.h"
84
85#define	ALTF_BG		0x1
86#define ALTF_NOCONN	0x2
87#define ALTF_DUMBTIMR	0x4
88#define ALTF_INTR	0x8
89#define ALTF_KERB	0x10
90#define ALTF_NFSV3	0x20
91#define ALTF_RDIRPLUS	0x40
92#define	ALTF_MNTUDP	0x80
93#define ALTF_RESVPORT	0x100
94#define ALTF_SEQPACKET	0x200
95#define ALTF_NQNFS	0x400
96#define ALTF_SOFT	0x800
97#define ALTF_TCP	0x1000
98#define ALTF_PORT	0x2000
99#define ALTF_NFSV2	0x4000
100#define ALTF_ACREGMIN	0x8000
101#define ALTF_ACREGMAX	0x10000
102#define ALTF_ACDIRMIN	0x20000
103#define ALTF_ACDIRMAX	0x40000
104
105struct mntopt mopts[] = {
106	MOPT_STDOPTS,
107	MOPT_FORCE,
108	MOPT_UPDATE,
109	MOPT_ASYNC,
110	{ "bg", 0, ALTF_BG, 1 },
111	{ "conn", 1, ALTF_NOCONN, 1 },
112	{ "dumbtimer", 0, ALTF_DUMBTIMR, 1 },
113	{ "intr", 0, ALTF_INTR, 1 },
114#ifdef NFSKERB
115	{ "kerb", 0, ALTF_KERB, 1 },
116#endif
117	{ "nfsv3", 0, ALTF_NFSV3, 1 },
118	{ "rdirplus", 0, ALTF_RDIRPLUS, 1 },
119	{ "mntudp", 0, ALTF_MNTUDP, 1 },
120	{ "resvport", 0, ALTF_RESVPORT, 1 },
121	{ "nqnfs", 0, ALTF_NQNFS, 1 },
122	{ "soft", 0, ALTF_SOFT, 1 },
123	{ "tcp", 0, ALTF_TCP, 1 },
124	{ "port=", 0, ALTF_PORT, 1 },
125	{ "nfsv2", 0, ALTF_NFSV2, 1 },
126	{ "acregmin=", 0, ALTF_ACREGMIN, 1 },
127	{ "acregmax=", 0, ALTF_ACREGMAX, 1 },
128	{ "acdirmin=", 0, ALTF_ACDIRMIN, 1 },
129	{ "acdirmax=", 0, ALTF_ACDIRMAX, 1 },
130	{ NULL }
131};
132
133struct nfs_args nfsdefargs = {
134	NFS_ARGSVERSION,
135	(struct sockaddr *)0,
136	sizeof (struct sockaddr_in),
137	SOCK_DGRAM,
138	0,
139	(u_char *)0,
140	0,
141	NFSMNT_RESVPORT,
142	NFS_WSIZE,
143	NFS_RSIZE,
144	NFS_READDIRSIZE,
145	10,
146	NFS_RETRANS,
147	NFS_MAXGRPS,
148	NFS_DEFRAHEAD,
149	NQ_DEFLEASE,
150	NQ_DEADTHRESH,
151	(char *)0,
152	/* args version 4 */
153	NFS_MINATTRTIMO,
154	NFS_MAXATTRTIMO,
155	NFS_MINDIRATTRTIMO,
156	NFS_MAXDIRATTRTIMO,
157};
158
159struct nfhret {
160	u_long		stat;
161	long		vers;
162	long		auth;
163	long		fhsize;
164	u_char		nfh[NFSX_V3FHMAX];
165};
166#define	DEF_RETRY	10000
167#define	BGRND	1
168#define	ISBGRND	2
169int retrycnt = DEF_RETRY;
170int opflags = 0;
171int nfsproto = IPPROTO_UDP;
172int mnttcp_ok = 1;
173u_short port_no = 0;
174enum {
175	ANY,
176	V2,
177	V3
178} mountmode = ANY;
179
180#ifdef NFSKERB
181char inst[INST_SZ];
182char realm[REALM_SZ];
183struct {
184	u_long		kind;
185	KTEXT_ST	kt;
186} ktick;
187struct nfsrpc_nickverf kverf;
188struct nfsrpc_fullblock kin, kout;
189NFSKERBKEY_T kivec;
190CREDENTIALS kcr;
191struct timeval ktv;
192NFSKERBKEYSCHED_T kerb_keysched;
193#endif
194
195int	getnfsargs __P((char *, struct nfs_args *));
196void	set_rpc_maxgrouplist __P((int));
197void	usage __P((void)) __dead2;
198int	xdr_dir __P((XDR *, char *));
199int	xdr_fh __P((XDR *, struct nfhret *));
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 */
207static void
208set_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
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	struct nfsd_cargs ncd;
248	int mntflags, altflags, i, nfssvc_flag, num;
249	char *name, *p, *spec;
250	char mntpath[MAXPATHLEN];
251	struct vfsconf vfc;
252	int error = 0;
253#ifdef NFSKERB
254	uid_t last_ruid;
255
256	last_ruid = -1;
257	(void)strcpy(realm, KRB_REALM);
258	if (sizeof (struct nfsrpc_nickverf) != RPCX_NICKVERF ||
259	    sizeof (struct nfsrpc_fullblock) != RPCX_FULLBLOCK ||
260	    ((char *)&ktick.kt) - ((char *)&ktick) != NFSX_UNSIGNED ||
261	    ((char *)ktick.kt.dat) - ((char *)&ktick) != 2 * NFSX_UNSIGNED)
262		fprintf(stderr, "Yikes! NFSKERB structs not packed!!\n");
263#endif /* NFSKERB */
264	retrycnt = DEF_RETRY;
265
266	mntflags = 0;
267	altflags = 0;
268	nfsargs = nfsdefargs;
269	nfsargsp = &nfsargs;
270	while ((c = getopt(argc, argv,
271	    "23a:bcdD:g:I:iKL:lm:No:PpqR:r:sTt:w:x:U")) != -1)
272		switch (c) {
273		case '2':
274			mountmode = V2;
275			break;
276		case '3':
277			mountmode = V3;
278			break;
279		case 'a':
280			num = strtol(optarg, &p, 10);
281			if (*p || num < 0)
282				errx(1, "illegal -a value -- %s", optarg);
283			nfsargsp->readahead = num;
284			nfsargsp->flags |= NFSMNT_READAHEAD;
285			break;
286		case 'b':
287			opflags |= BGRND;
288			break;
289		case 'c':
290			nfsargsp->flags |= NFSMNT_NOCONN;
291			break;
292		case 'D':
293			num = strtol(optarg, &p, 10);
294			if (*p || num <= 0)
295				errx(1, "illegal -D value -- %s", optarg);
296			nfsargsp->deadthresh = num;
297			nfsargsp->flags |= NFSMNT_DEADTHRESH;
298			break;
299		case 'd':
300			nfsargsp->flags |= NFSMNT_DUMBTIMR;
301			break;
302		case 'g':
303			num = strtol(optarg, &p, 10);
304			if (*p || num <= 0)
305				errx(1, "illegal -g value -- %s", optarg);
306#ifdef __FreeBSD__
307			set_rpc_maxgrouplist(num);
308#endif
309			nfsargsp->maxgrouplist = num;
310			nfsargsp->flags |= NFSMNT_MAXGRPS;
311			break;
312		case 'I':
313			num = strtol(optarg, &p, 10);
314			if (*p || num <= 0)
315				errx(1, "illegal -I value -- %s", optarg);
316			nfsargsp->readdirsize = num;
317			nfsargsp->flags |= NFSMNT_READDIRSIZE;
318			break;
319		case 'i':
320			nfsargsp->flags |= NFSMNT_INT;
321			break;
322#ifdef NFSKERB
323		case 'K':
324			nfsargsp->flags |= NFSMNT_KERB;
325			break;
326#endif
327		case 'L':
328			num = strtol(optarg, &p, 10);
329			if (*p || num < 2)
330				errx(1, "illegal -L value -- %s", optarg);
331			nfsargsp->leaseterm = num;
332			nfsargsp->flags |= NFSMNT_LEASETERM;
333			break;
334		case 'l':
335			nfsargsp->flags |= NFSMNT_RDIRPLUS;
336			break;
337#ifdef NFSKERB
338		case 'm':
339			(void)strncpy(realm, optarg, REALM_SZ - 1);
340			realm[REALM_SZ - 1] = '\0';
341			break;
342#endif
343		case 'N':
344			nfsargsp->flags &= ~NFSMNT_RESVPORT;
345			break;
346		case 'o':
347			altflags = 0;
348			set_flags(&altflags, &nfsargsp->flags, TRUE);
349			if (mountmode == V2)
350				altflags |= ALTF_NFSV2;
351			else if (mountmode == V3)
352				altflags |= ALTF_NFSV3;
353			getmntopts(optarg, mopts, &mntflags, &altflags);
354			set_flags(&altflags, &nfsargsp->flags, FALSE);
355			/*
356			 * Handle altflags which don't map directly to
357			 * mount flags.
358			 */
359			if(altflags & ALTF_BG)
360				opflags |= BGRND;
361			if(altflags & ALTF_MNTUDP)
362				mnttcp_ok = 0;
363			if(altflags & ALTF_TCP) {
364				nfsargsp->sotype = SOCK_STREAM;
365				nfsproto = IPPROTO_TCP;
366			}
367			if(altflags & ALTF_PORT)
368				port_no = atoi(strstr(optarg, "port=") + 5);
369			mountmode = ANY;
370			if(altflags & ALTF_NFSV2)
371				mountmode = V2;
372			if(altflags & ALTF_NFSV3)
373				mountmode = V3;
374			if(altflags & ALTF_ACREGMIN)
375				nfsargsp->acregmin = atoi(strstr(optarg,
376				    "acregmin=") + 9);
377			if(altflags & ALTF_ACREGMAX)
378				nfsargsp->acregmax = atoi(strstr(optarg,
379				    "acregmax=") + 9);
380			if(altflags & ALTF_ACDIRMIN)
381				nfsargsp->acdirmin = atoi(strstr(optarg,
382				    "acdirmin=") + 9);
383			if(altflags & ALTF_ACDIRMAX)
384				nfsargsp->acdirmax = atoi(strstr(optarg,
385				    "acdirmax=") + 9);
386			break;
387		case 'P':
388			/* obsolete for NFSMNT_RESVPORT, now default */
389			break;
390		case 'q':
391			mountmode = V3;
392			nfsargsp->flags |= NFSMNT_NQNFS;
393			break;
394		case 'R':
395			num = strtol(optarg, &p, 10);
396			if (*p || num <= 0)
397				errx(1, "illegal -R value -- %s", optarg);
398			retrycnt = num;
399			break;
400		case 'r':
401			num = strtol(optarg, &p, 10);
402			if (*p || num <= 0)
403				errx(1, "illegal -r value -- %s", optarg);
404			nfsargsp->rsize = num;
405			nfsargsp->flags |= NFSMNT_RSIZE;
406			break;
407		case 's':
408			nfsargsp->flags |= NFSMNT_SOFT;
409			break;
410		case 'T':
411			nfsargsp->sotype = SOCK_STREAM;
412			nfsproto = IPPROTO_TCP;
413			break;
414		case 't':
415			num = strtol(optarg, &p, 10);
416			if (*p || num <= 0)
417				errx(1, "illegal -t value -- %s", optarg);
418			nfsargsp->timeo = num;
419			nfsargsp->flags |= NFSMNT_TIMEO;
420			break;
421		case 'w':
422			num = strtol(optarg, &p, 10);
423			if (*p || num <= 0)
424				errx(1, "illegal -w value -- %s", optarg);
425			nfsargsp->wsize = num;
426			nfsargsp->flags |= NFSMNT_WSIZE;
427			break;
428		case 'x':
429			num = strtol(optarg, &p, 10);
430			if (*p || num <= 0)
431				errx(1, "illegal -x value -- %s", optarg);
432			nfsargsp->retrans = num;
433			nfsargsp->flags |= NFSMNT_RETRANS;
434			break;
435		case 'U':
436			mnttcp_ok = 0;
437			break;
438		default:
439			usage();
440			break;
441		}
442	argc -= optind;
443	argv += optind;
444
445	if (argc != 2) {
446		usage();
447		/* NOTREACHED */
448	}
449
450	spec = *argv++;
451	name = *argv;
452
453	if (!getnfsargs(spec, nfsargsp))
454		exit(1);
455
456	/* resolve the mountpoint with realpath(3) */
457	(void)checkpath(name, mntpath);
458
459#ifdef __FreeBSD__
460	error = getvfsbyname("nfs", &vfc);
461	if (error && vfsisloadable("nfs")) {
462		if(vfsload("nfs"))
463			err(EX_OSERR, "vfsload(nfs)");
464		endvfsent();	/* clear cache */
465		error = getvfsbyname("nfs", &vfc);
466	}
467	if (error)
468		errx(EX_OSERR, "nfs filesystem is not available");
469
470	if (mount(vfc.vfc_name, mntpath, mntflags, nfsargsp))
471		err(1, "%s", mntpath);
472#else
473	if (mount("nfs", mntpath, mntflags, nfsargsp))
474		err(1, "%s", mntpath);
475#endif
476	if (nfsargsp->flags & (NFSMNT_NQNFS | NFSMNT_KERB)) {
477		if ((opflags & ISBGRND) == 0) {
478			if ((i = fork())) {
479				if (i == -1)
480					err(1, "nqnfs 1");
481				exit(0);
482			}
483			(void) setsid();
484			(void) close(STDIN_FILENO);
485			(void) close(STDOUT_FILENO);
486			(void) close(STDERR_FILENO);
487			(void) chdir("/");
488		}
489		openlog("mount_nfs:", LOG_PID, LOG_DAEMON);
490		nfssvc_flag = NFSSVC_MNTD;
491		ncd.ncd_dirp = mntpath;
492		while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) {
493			if (errno != ENEEDAUTH) {
494				syslog(LOG_ERR, "nfssvc err %m");
495				continue;
496			}
497			nfssvc_flag =
498			    NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL;
499#ifdef NFSKERB
500			/*
501			 * Set up as ncd_authuid for the kerberos call.
502			 * Must set ruid to ncd_authuid and reset the
503			 * ticket name iff ncd_authuid is not the same
504			 * as last time, so that the right ticket file
505			 * is found.
506			 * Get the Kerberos credential structure so that
507			 * we have the session key and get a ticket for
508			 * this uid.
509			 * For more info see the IETF Draft "Authentication
510			 * in ONC RPC".
511			 */
512			if (ncd.ncd_authuid != last_ruid) {
513				char buf[512];
514				(void)sprintf(buf, "%s%d",
515					      TKT_ROOT, ncd.ncd_authuid);
516				krb_set_tkt_string(buf);
517				last_ruid = ncd.ncd_authuid;
518			}
519			setreuid(ncd.ncd_authuid, 0);
520			kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr);
521			if (kret == RET_NOTKT) {
522		            kret = get_ad_tkt(NFS_KERBSRV, inst, realm,
523				DEFAULT_TKT_LIFE);
524			    if (kret == KSUCCESS)
525				kret = krb_get_cred(NFS_KERBSRV, inst, realm,
526				    &kcr);
527			}
528			if (kret == KSUCCESS)
529			    kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst,
530				realm, 0);
531
532			/*
533			 * Fill in the AKN_FULLNAME authenticator and verifier.
534			 * Along with the Kerberos ticket, we need to build
535			 * the timestamp verifier and encrypt it in CBC mode.
536			 */
537			if (kret == KSUCCESS &&
538			    ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED)
539			    && gettimeofday(&ktv, (struct timezone *)0) == 0) {
540			    ncd.ncd_authtype = RPCAUTH_KERB4;
541			    ncd.ncd_authstr = (u_char *)&ktick;
542			    ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) +
543				3 * NFSX_UNSIGNED;
544			    ncd.ncd_verfstr = (u_char *)&kverf;
545			    ncd.ncd_verflen = sizeof (kverf);
546			    memmove(ncd.ncd_key, kcr.session,
547				sizeof (kcr.session));
548			    kin.t1 = htonl(ktv.tv_sec);
549			    kin.t2 = htonl(ktv.tv_usec);
550			    kin.w1 = htonl(NFS_KERBTTL);
551			    kin.w2 = htonl(NFS_KERBTTL - 1);
552			    bzero((caddr_t)kivec, sizeof (kivec));
553
554			    /*
555			     * Encrypt kin in CBC mode using the session
556			     * key in kcr.
557			     */
558			    XXX
559
560			    /*
561			     * Finally, fill the timestamp verifier into the
562			     * authenticator and verifier.
563			     */
564			    ktick.kind = htonl(RPCAKN_FULLNAME);
565			    kverf.kind = htonl(RPCAKN_FULLNAME);
566			    NFS_KERBW1(ktick.kt) = kout.w1;
567			    ktick.kt.length = htonl(ktick.kt.length);
568			    kverf.verf.t1 = kout.t1;
569			    kverf.verf.t2 = kout.t2;
570			    kverf.verf.w2 = kout.w2;
571			    nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH;
572			}
573			setreuid(0, 0);
574#endif /* NFSKERB */
575		}
576	}
577	exit(0);
578}
579
580/*
581 * Return RPC_SUCCESS if server responds.
582 */
583enum clnt_stat
584pingnfsserver(addr, version, sotype)
585	struct sockaddr_in *addr;
586	int version;
587	int sotype;
588{
589	struct sockaddr_in sin;
590	int tport;
591	CLIENT *clp;
592	int so = RPC_ANYSOCK;
593	enum clnt_stat stat;
594	struct timeval pertry, try;
595
596	sin = *addr;
597
598	if ((tport = port_no ? port_no :
599	     pmap_getport(&sin, RPCPROG_NFS, version, nfsproto)) == 0) {
600		return rpc_createerr.cf_stat;
601	}
602
603	sin.sin_port = htons(tport);
604
605	pertry.tv_sec = 10;
606	pertry.tv_usec = 0;
607	if (sotype == SOCK_STREAM)
608		clp = clnttcp_create(&sin, RPCPROG_NFS, version,
609				     &so, 0, 0);
610	else
611		clp = clntudp_create(&sin, RPCPROG_NFS, version,
612				     pertry, &so);
613	if (clp == NULL)
614		return rpc_createerr.cf_stat;
615
616	try.tv_sec = 10;
617	try.tv_usec = 0;
618	stat = clnt_call(clp, NFSPROC_NULL,
619			 xdr_void, NULL, xdr_void, NULL, try);
620
621	clnt_destroy(clp);
622
623	return stat;
624}
625
626int
627getnfsargs(spec, nfsargsp)
628	char *spec;
629	struct nfs_args *nfsargsp;
630{
631	register CLIENT *clp;
632	struct hostent *hp;
633	static struct sockaddr_in saddr;
634	struct timeval pertry, try;
635	enum clnt_stat clnt_stat;
636	int so = RPC_ANYSOCK, i, nfsvers, mntvers, orgcnt, speclen;
637	char *hostp, *delimp;
638#ifdef NFSKERB
639	char *cp;
640#endif
641	u_short tport;
642	size_t len;
643	static struct nfhret nfhret;
644	static char nam[MNAMELEN + 1];
645
646	tport = 0;
647
648	if ((delimp = strchr(spec, ':')) != NULL) {
649		hostp = spec;
650		spec = delimp + 1;
651	} else if ((delimp = strrchr(spec, '@')) != NULL) {
652		warnx("path@server syntax is deprecated, use server:path");
653		hostp = delimp + 1;
654	} else {
655		warnx("no <host>:<dirpath> nfs-name");
656		return (0);
657	}
658
659	*delimp = '\0';
660
661	/*
662	 * If there has been a trailing slash at mounttime it seems
663	 * that some mountd implementations fail to remove the mount
664	 * entries from their mountlist while unmounting.
665	 */
666	for (speclen = strlen(spec);
667		speclen > 1 && spec[speclen - 1] == '/';
668		speclen--)
669		spec[speclen - 1] = '\0';
670	if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
671		warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
672		return (0);
673	}
674	/* Make both '@' and ':' notations equal */
675	if (*hostp != '\0') {
676		len = strlen(hostp);
677		memmove(nam, hostp, len);
678		nam[len] = ':';
679		memmove(nam + len + 1, spec, speclen);
680		nam[len + speclen + 1] = '\0';
681	}
682
683	/*
684	 * Handle an internet host address and reverse resolve it if
685	 * doing Kerberos.
686	 */
687	if (isdigit(*hostp)) {
688		if ((saddr.sin_addr.s_addr = inet_addr(hostp)) == -1) {
689			warnx("bad net address %s", hostp);
690			return (0);
691		}
692	} else if ((hp = gethostbyname(hostp)) != NULL)
693		memmove(&saddr.sin_addr, hp->h_addr,
694		    MIN(hp->h_length, sizeof(saddr.sin_addr)));
695	else {
696		warnx("can't get net id for host");
697		return (0);
698        }
699#ifdef NFSKERB
700	if ((nfsargsp->flags & NFSMNT_KERB)) {
701		if ((hp = gethostbyaddr((char *)&saddr.sin_addr.s_addr,
702		    sizeof (u_long), AF_INET)) == (struct hostent *)0) {
703			warnx("can't reverse resolve net address");
704			return (0);
705		}
706		memmove(&saddr.sin_addr, hp->h_addr,
707		    MIN(hp->h_length, sizeof(saddr.sin_addr)));
708		strncpy(inst, hp->h_name, INST_SZ);
709		inst[INST_SZ - 1] = '\0';
710		if (cp = strchr(inst, '.'))
711			*cp = '\0';
712	}
713#endif /* NFSKERB */
714
715	orgcnt = retrycnt;
716tryagain:
717	if (mountmode == ANY || mountmode == V3) {
718		nfsvers = 3;
719		mntvers = 3;
720		nfsargsp->flags |= NFSMNT_NFSV3;
721	} else {
722		nfsvers = 2;
723		mntvers = 1;
724		nfsargsp->flags &= ~NFSMNT_NFSV3;
725	}
726	nfhret.stat = EACCES;	/* Mark not yet successful */
727	while (retrycnt > 0) {
728		saddr.sin_family = AF_INET;
729		saddr.sin_port = htons(PMAPPORT);
730		if ((tport = port_no ? port_no :
731		     pmap_getport(&saddr, RPCPROG_NFS,
732		    		  nfsvers, nfsproto)) == 0) {
733			if ((opflags & ISBGRND) == 0)
734				clnt_pcreateerror("NFS Portmap");
735		} else {
736			/*
737			 * First ping the nfs server to see if it supports
738			 * the version of the protocol we want to use.
739			 */
740			clnt_stat = pingnfsserver(&saddr, nfsvers,
741						  nfsargsp->sotype);
742			if (clnt_stat == RPC_PROGVERSMISMATCH) {
743				if (mountmode == ANY) {
744					mountmode = V2;
745					goto tryagain;
746				} else {
747					errx(1, "can't contact NFS server");
748				}
749			}
750			saddr.sin_port = 0;
751			pertry.tv_sec = 10;
752			pertry.tv_usec = 0;
753			if (mnttcp_ok && nfsargsp->sotype == SOCK_STREAM)
754			    clp = clnttcp_create(&saddr, RPCPROG_MNT, mntvers,
755				&so, 0, 0);
756			else
757			    clp = clntudp_create(&saddr, RPCPROG_MNT, mntvers,
758				pertry, &so);
759			if (clp == NULL) {
760				if ((opflags & ISBGRND) == 0)
761					clnt_pcreateerror("Cannot MNT RPC");
762			} else {
763				clp->cl_auth = authunix_create_default();
764				try.tv_sec = 10;
765				try.tv_usec = 0;
766				if (nfsargsp->flags & NFSMNT_KERB)
767				    nfhret.auth = RPCAUTH_KERB4;
768				else
769				    nfhret.auth = RPCAUTH_UNIX;
770				nfhret.vers = mntvers;
771				clnt_stat = clnt_call(clp, RPCMNT_MOUNT,
772				    xdr_dir, spec, xdr_fh, &nfhret, try);
773				if (clnt_stat != RPC_SUCCESS) {
774					if (clnt_stat == RPC_PROGVERSMISMATCH) {
775						if (mountmode == ANY) {
776							mountmode = V2;
777							goto tryagain;
778						} else {
779							errx(1, "%s",
780							     clnt_sperror(clp, "MNT RPC"));
781						}
782					}
783					if ((opflags & ISBGRND) == 0)
784						warnx("%s", clnt_sperror(clp,
785						    "bad MNT RPC"));
786				} else {
787					retrycnt = 0;
788				}
789				auth_destroy(clp->cl_auth);
790				clnt_destroy(clp);
791				so = RPC_ANYSOCK;
792			}
793		}
794		if (--retrycnt > 0) {
795			if (opflags & BGRND) {
796				warnx("Cannot immediately mount %s:%s, "
797				    "backgrounding", hostp, spec);
798				opflags &= ~BGRND;
799				if ((i = fork())) {
800					if (i == -1)
801						err(1, "nqnfs 2");
802					exit(0);
803				}
804				(void) setsid();
805				(void) close(STDIN_FILENO);
806				(void) close(STDOUT_FILENO);
807				(void) close(STDERR_FILENO);
808				(void) chdir("/");
809				opflags |= ISBGRND;
810			}
811			sleep(60);
812		}
813	}
814	if (nfhret.stat) {
815		if (opflags & ISBGRND)
816			exit(1);
817		warnx("can't access %s: %s", spec, strerror(nfhret.stat));
818		return (0);
819	}
820	saddr.sin_port = htons(tport);
821	{
822		nfsargsp->addr = (struct sockaddr *) &saddr;
823		nfsargsp->addrlen = sizeof (saddr);
824	}
825	nfsargsp->fh = nfhret.nfh;
826	nfsargsp->fhsize = nfhret.fhsize;
827	nfsargsp->hostname = nam;
828	/* Add mounted filesystem to PATH_MOUNTTAB */
829	if (!add_mtab(hostp, spec))
830		warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
831	return (1);
832}
833
834/*
835 * xdr routines for mount rpc's
836 */
837int
838xdr_dir(xdrsp, dirp)
839	XDR *xdrsp;
840	char *dirp;
841{
842	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
843}
844
845int
846xdr_fh(xdrsp, np)
847	XDR *xdrsp;
848	register struct nfhret *np;
849{
850	register int i;
851	long auth, authcnt, authfnd = 0;
852
853	if (!xdr_u_long(xdrsp, &np->stat))
854		return (0);
855	if (np->stat)
856		return (1);
857	switch (np->vers) {
858	case 1:
859		np->fhsize = NFSX_V2FH;
860		return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
861	case 3:
862		if (!xdr_long(xdrsp, &np->fhsize))
863			return (0);
864		if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
865			return (0);
866		if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
867			return (0);
868		if (!xdr_long(xdrsp, &authcnt))
869			return (0);
870		for (i = 0; i < authcnt; i++) {
871			if (!xdr_long(xdrsp, &auth))
872				return (0);
873			if (auth == np->auth)
874				authfnd++;
875		}
876		/*
877		 * Some servers, such as DEC's OSF/1 return a nil authenticator
878		 * list to indicate RPCAUTH_UNIX.
879		 */
880		if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
881			np->stat = EAUTH;
882		return (1);
883	};
884	return (0);
885}
886
887void
888usage()
889{
890	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
891"usage: mount_nfs [-23KNPTUbcdilqs] [-D deadthresh] [-I readdirsize]",
892"                 [-L leaseterm] [-R retrycnt] [-a maxreadahead]",
893"                 [-g maxgroups] [-m realm] [-o options] [-r readsize]",
894"                 [-t timeout] [-w writesize] [-x retrans] rhost:path node");
895	exit(1);
896}
897