mount_nfs.c revision 24546 
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 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/*
45static char sccsid[] = "@(#)mount_nfs.c	8.11 (Berkeley) 5/4/95";
46*/
47static const char rcsid[] =
48	"$Id: mount_nfs.c,v 1.19 1997/04/01 17:20:17 guido Exp $";
49#endif /* not lint */
50
51#include <sys/param.h>
52#include <sys/mount.h>
53#include <sys/socket.h>
54#include <sys/socketvar.h>
55#include <sys/stat.h>
56#include <sys/syslog.h>
57
58#include <rpc/rpc.h>
59#include <rpc/pmap_clnt.h>
60#include <rpc/pmap_prot.h>
61
62#ifdef ISO
63#include <netiso/iso.h>
64#endif
65
66#ifdef NFSKERB
67#include <kerberosIV/des.h>
68#include <kerberosIV/krb.h>
69#endif
70
71#include <nfs/rpcv2.h>
72#include <nfs/nfsproto.h>
73#define KERNEL
74#include <nfs/nfs.h>
75#undef KERNEL
76#include <nfs/nqnfs.h>
77
78#include <arpa/inet.h>
79
80#include <ctype.h>
81#include <err.h>
82#include <errno.h>
83#include <fcntl.h>
84#include <netdb.h>
85#include <signal.h>
86#include <stdio.h>
87#include <stdlib.h>
88#include <strings.h>
89#include <sysexits.h>
90#include <unistd.h>
91
92#include "mntopts.h"
93
94#define	ALTF_BG		0x1
95#define ALTF_NOCONN	0x2
96#define ALTF_DUMBTIMR	0x4
97#define ALTF_INTR	0x8
98#define ALTF_KERB	0x10
99#define ALTF_NFSV3	0x20
100#define ALTF_RDIRPLUS	0x40
101#define	ALTF_MNTUDP	0x80
102#define ALTF_RESVPORT	0x100
103#define ALTF_SEQPACKET	0x200
104#define ALTF_NQNFS	0x400
105#define ALTF_SOFT	0x800
106#define ALTF_TCP	0x1000
107#define ALTF_PORT	0x2000
108
109struct mntopt mopts[] = {
110	MOPT_STDOPTS,
111	MOPT_FORCE,
112	MOPT_UPDATE,
113	{ "bg", 0, ALTF_BG, 1 },
114	{ "conn", 1, ALTF_NOCONN, 1 },
115	{ "dumbtimer", 0, ALTF_DUMBTIMR, 1 },
116	{ "intr", 0, ALTF_INTR, 1 },
117#ifdef NFSKERB
118	{ "kerb", 0, ALTF_KERB, 1 },
119#endif
120	{ "nfsv3", 0, ALTF_NFSV3, 1 },
121	{ "rdirplus", 0, ALTF_RDIRPLUS, 1 },
122	{ "mntudp", 0, ALTF_MNTUDP, 1 },
123	{ "resvport", 0, ALTF_RESVPORT, 1 },
124#ifdef ISO
125	{ "seqpacket", 0, ALTF_SEQPACKET, 1 },
126#endif
127	{ "nqnfs", 0, ALTF_NQNFS, 1 },
128	{ "soft", 0, ALTF_SOFT, 1 },
129	{ "tcp", 0, ALTF_TCP, 1 },
130	{ "port=", 0, ALTF_PORT, 1 },
131	{ NULL }
132};
133
134struct nfs_args nfsdefargs = {
135	NFS_ARGSVERSION,
136	(struct sockaddr *)0,
137	sizeof (struct sockaddr_in),
138	SOCK_DGRAM,
139	0,
140	(u_char *)0,
141	0,
142	NFSMNT_RESVPORT,
143	NFS_WSIZE,
144	NFS_RSIZE,
145	NFS_READDIRSIZE,
146	10,
147	NFS_RETRANS,
148	NFS_MAXGRPS,
149	NFS_DEFRAHEAD,
150	NQ_DEFLEASE,
151	NQ_DEADTHRESH,
152	(char *)0,
153};
154
155struct nfhret {
156	u_long		stat;
157	long		vers;
158	long		auth;
159	long		fhsize;
160	u_char		nfh[NFSX_V3FHMAX];
161};
162#define	DEF_RETRY	10000
163#define	BGRND	1
164#define	ISBGRND	2
165int retrycnt = DEF_RETRY;
166int opflags = 0;
167int nfsproto = IPPROTO_UDP;
168int mnttcp_ok = 1;
169u_short port_no = 0;
170
171#ifdef NFSKERB
172char inst[INST_SZ];
173char realm[REALM_SZ];
174struct {
175	u_long		kind;
176	KTEXT_ST	kt;
177} ktick;
178struct nfsrpc_nickverf kverf;
179struct nfsrpc_fullblock kin, kout;
180NFSKERBKEY_T kivec;
181CREDENTIALS kcr;
182struct timeval ktv;
183NFSKERBKEYSCHED_T kerb_keysched;
184#endif
185
186int	getnfsargs __P((char *, struct nfs_args *));
187#ifdef ISO
188struct	iso_addr *iso_addr __P((const char *));
189#endif
190void	set_rpc_maxgrouplist __P((int));
191void	usage __P((void)) __dead2;
192int	xdr_dir __P((XDR *, char *));
193int	xdr_fh __P((XDR *, struct nfhret *));
194
195/*
196 * Used to set mount flags with getmntopts.  Call with dir=TRUE to
197 * initialise altflags from the current mount flags.  Call with
198 * dir=FALSE to update mount flags with the new value of altflags after
199 * the call to getmntopts.
200 */
201static void
202setflags(int* altflags, int* nfsflags, int dir)
203{
204#define F2(af, nf)					\
205	if (dir) {					\
206		if (*nfsflags & NFSMNT_##nf)		\
207			*altflags |= ALTF_##af;		\
208		else					\
209			*altflags &= ~ALTF_##af;	\
210	} else {					\
211		if (*altflags & ALTF_##af)		\
212			*nfsflags |= NFSMNT_##nf;	\
213		else					\
214			*nfsflags &= ~NFSMNT_##nf;	\
215	}
216#define F(f)	F2(f,f)
217
218	F(NOCONN);
219	F(DUMBTIMR);
220	F2(INTR, INT);
221#ifdef NFSKERB
222	F(KERB);
223#endif
224	F(NFSV3);
225	F(RDIRPLUS);
226	F(RESVPORT);
227	F(NQNFS);
228	F(SOFT);
229
230#undef F
231#undef F2
232}
233
234int
235main(argc, argv)
236	int argc;
237	char *argv[];
238{
239	register int c;
240	register struct nfs_args *nfsargsp;
241	struct nfs_args nfsargs;
242	struct nfsd_cargs ncd;
243	int mntflags, altflags, i, nfssvc_flag, num;
244	char *name, *p, *spec;
245	struct vfsconf vfc;
246	int error = 0;
247#ifdef NFSKERB
248	uid_t last_ruid;
249
250	last_ruid = -1;
251	(void)strcpy(realm, KRB_REALM);
252	if (sizeof (struct nfsrpc_nickverf) != RPCX_NICKVERF ||
253	    sizeof (struct nfsrpc_fullblock) != RPCX_FULLBLOCK ||
254	    ((char *)&ktick.kt) - ((char *)&ktick) != NFSX_UNSIGNED ||
255	    ((char *)ktick.kt.dat) - ((char *)&ktick) != 2 * NFSX_UNSIGNED)
256		fprintf(stderr, "Yikes! NFSKERB structs not packed!!\n");
257#endif /* NFSKERB */
258	retrycnt = DEF_RETRY;
259
260	mntflags = 0;
261	altflags = 0;
262	nfsargs = nfsdefargs;
263	nfsargsp = &nfsargs;
264	while ((c = getopt(argc, argv,
265	    "3a:bcdD:g:I:iKL:lm:o:PpqR:r:sTt:w:x:U")) != -1)
266		switch (c) {
267		case '3':
268			nfsargsp->flags |= NFSMNT_NFSV3;
269			break;
270		case 'a':
271			num = strtol(optarg, &p, 10);
272			if (*p || num < 0)
273				errx(1, "illegal -a value -- %s", optarg);
274			nfsargsp->readahead = num;
275			nfsargsp->flags |= NFSMNT_READAHEAD;
276			break;
277		case 'b':
278			opflags |= BGRND;
279			break;
280		case 'c':
281			nfsargsp->flags |= NFSMNT_NOCONN;
282			break;
283		case 'D':
284			num = strtol(optarg, &p, 10);
285			if (*p || num <= 0)
286				errx(1, "illegal -D value -- %s", optarg);
287			nfsargsp->deadthresh = num;
288			nfsargsp->flags |= NFSMNT_DEADTHRESH;
289			break;
290		case 'd':
291			nfsargsp->flags |= NFSMNT_DUMBTIMR;
292			break;
293		case 'g':
294			num = strtol(optarg, &p, 10);
295			if (*p || num <= 0)
296				errx(1, "illegal -g value -- %s", optarg);
297#ifdef __FreeBSD__
298			set_rpc_maxgrouplist(num);
299#endif
300			nfsargsp->maxgrouplist = num;
301			nfsargsp->flags |= NFSMNT_MAXGRPS;
302			break;
303		case 'I':
304			num = strtol(optarg, &p, 10);
305			if (*p || num <= 0)
306				errx(1, "illegal -I value -- %s", optarg);
307			nfsargsp->readdirsize = num;
308			nfsargsp->flags |= NFSMNT_READDIRSIZE;
309			break;
310		case 'i':
311			nfsargsp->flags |= NFSMNT_INT;
312			break;
313#ifdef NFSKERB
314		case 'K':
315			nfsargsp->flags |= NFSMNT_KERB;
316			break;
317#endif
318		case 'L':
319			num = strtol(optarg, &p, 10);
320			if (*p || num < 2)
321				errx(1, "illegal -L value -- %s", optarg);
322			nfsargsp->leaseterm = num;
323			nfsargsp->flags |= NFSMNT_LEASETERM;
324			break;
325		case 'l':
326			nfsargsp->flags |= NFSMNT_RDIRPLUS;
327			break;
328#ifdef NFSKERB
329		case 'm':
330			(void)strncpy(realm, optarg, REALM_SZ - 1);
331			realm[REALM_SZ - 1] = '\0';
332			break;
333#endif
334		case 'o':
335			altflags = 0;
336			setflags(&altflags, &nfsargsp->flags, TRUE);
337			getmntopts(optarg, mopts, &mntflags, &altflags);
338			setflags(&altflags, &nfsargsp->flags, FALSE);
339			/*
340			 * Handle altflags which don't map directly to
341			 * mount flags.
342			 */
343			if(altflags & ALTF_BG)
344				opflags |= BGRND;
345			if(altflags & ALTF_MNTUDP)
346				mnttcp_ok = 0;
347#ifdef ISO
348			if(altflags & ALTF_SEQPACKET)
349				nfsargsp->sotype = SOCK_SEQPACKET;
350#endif
351			if(altflags & ALTF_TCP) {
352				nfsargsp->sotype = SOCK_STREAM;
353				nfsproto = IPPROTO_TCP;
354			}
355			if(altflags & ALTF_PORT)
356				port_no = atoi(strstr(optarg, "port=") + 5);
357			break;
358		case 'P':
359			nfsargsp->flags |= NFSMNT_RESVPORT;
360			break;
361#ifdef ISO
362		case 'p':
363			nfsargsp->sotype = SOCK_SEQPACKET;
364			break;
365#endif
366		case 'q':
367			nfsargsp->flags |= (NFSMNT_NQNFS | NFSMNT_NFSV3);
368			break;
369		case 'R':
370			num = strtol(optarg, &p, 10);
371			if (*p || num <= 0)
372				errx(1, "illegal -R value -- %s", optarg);
373			retrycnt = num;
374			break;
375		case 'r':
376			num = strtol(optarg, &p, 10);
377			if (*p || num <= 0)
378				errx(1, "illegal -r value -- %s", optarg);
379			nfsargsp->rsize = num;
380			nfsargsp->flags |= NFSMNT_RSIZE;
381			break;
382		case 's':
383			nfsargsp->flags |= NFSMNT_SOFT;
384			break;
385		case 'T':
386			nfsargsp->sotype = SOCK_STREAM;
387			nfsproto = IPPROTO_TCP;
388			break;
389		case 't':
390			num = strtol(optarg, &p, 10);
391			if (*p || num <= 0)
392				errx(1, "illegal -t value -- %s", optarg);
393			nfsargsp->timeo = num;
394			nfsargsp->flags |= NFSMNT_TIMEO;
395			break;
396		case 'w':
397			num = strtol(optarg, &p, 10);
398			if (*p || num <= 0)
399				errx(1, "illegal -w value -- %s", optarg);
400			nfsargsp->wsize = num;
401			nfsargsp->flags |= NFSMNT_WSIZE;
402			break;
403		case 'x':
404			num = strtol(optarg, &p, 10);
405			if (*p || num <= 0)
406				errx(1, "illegal -x value -- %s", optarg);
407			nfsargsp->retrans = num;
408			nfsargsp->flags |= NFSMNT_RETRANS;
409			break;
410		case 'U':
411			mnttcp_ok = 0;
412			break;
413		default:
414			usage();
415			break;
416		}
417	argc -= optind;
418	argv += optind;
419
420	if (argc != 2) {
421		usage();
422		/* NOTREACHED */
423	}
424
425	spec = *argv++;
426	name = *argv;
427
428	if (!getnfsargs(spec, nfsargsp))
429		exit(1);
430
431#ifdef __FreeBSD__
432	error = getvfsbyname("nfs", &vfc);
433	if (error && vfsisloadable("nfs")) {
434		if(vfsload("nfs"))
435			err(EX_OSERR, "vfsload(nfs)");
436		endvfsent();	/* clear cache */
437		error = getvfsbyname("nfs", &vfc);
438	}
439	if (error)
440		errx(EX_OSERR, "nfs filesystem is not available");
441
442	if (mount(vfc.vfc_name, name, mntflags, nfsargsp))
443		err(1, "%s", name);
444#else
445	if (mount("nfs", name, mntflags, nfsargsp))
446		err(1, "%s", name);
447#endif
448	if (nfsargsp->flags & (NFSMNT_NQNFS | NFSMNT_KERB)) {
449		if ((opflags & ISBGRND) == 0) {
450			if (i = fork()) {
451				if (i == -1)
452					err(1, "nqnfs 1");
453				exit(0);
454			}
455			(void) setsid();
456			(void) close(STDIN_FILENO);
457			(void) close(STDOUT_FILENO);
458			(void) close(STDERR_FILENO);
459			(void) chdir("/");
460		}
461		openlog("mount_nfs:", LOG_PID, LOG_DAEMON);
462		nfssvc_flag = NFSSVC_MNTD;
463		ncd.ncd_dirp = name;
464		while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) {
465			if (errno != ENEEDAUTH) {
466				syslog(LOG_ERR, "nfssvc err %m");
467				continue;
468			}
469			nfssvc_flag =
470			    NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL;
471#ifdef NFSKERB
472			/*
473			 * Set up as ncd_authuid for the kerberos call.
474			 * Must set ruid to ncd_authuid and reset the
475			 * ticket name iff ncd_authuid is not the same
476			 * as last time, so that the right ticket file
477			 * is found.
478			 * Get the Kerberos credential structure so that
479			 * we have the seesion key and get a ticket for
480			 * this uid.
481			 * For more info see the IETF Draft "Authentication
482			 * in ONC RPC".
483			 */
484			if (ncd.ncd_authuid != last_ruid) {
485				char buf[512];
486				(void)sprintf(buf, "%s%d",
487					      TKT_ROOT, ncd.ncd_authuid);
488				krb_set_tkt_string(buf);
489				last_ruid = ncd.ncd_authuid;
490			}
491			setreuid(ncd.ncd_authuid, 0);
492			kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr);
493			if (kret == RET_NOTKT) {
494		            kret = get_ad_tkt(NFS_KERBSRV, inst, realm,
495				DEFAULT_TKT_LIFE);
496			    if (kret == KSUCCESS)
497				kret = krb_get_cred(NFS_KERBSRV, inst, realm,
498				    &kcr);
499			}
500			if (kret == KSUCCESS)
501			    kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst,
502				realm, 0);
503
504			/*
505			 * Fill in the AKN_FULLNAME authenticator and verfier.
506			 * Along with the Kerberos ticket, we need to build
507			 * the timestamp verifier and encrypt it in CBC mode.
508			 */
509			if (kret == KSUCCESS &&
510			    ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED)
511			    && gettimeofday(&ktv, (struct timezone *)0) == 0) {
512			    ncd.ncd_authtype = RPCAUTH_KERB4;
513			    ncd.ncd_authstr = (u_char *)&ktick;
514			    ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) +
515				3 * NFSX_UNSIGNED;
516			    ncd.ncd_verfstr = (u_char *)&kverf;
517			    ncd.ncd_verflen = sizeof (kverf);
518			    memmove(ncd.ncd_key, kcr.session,
519				sizeof (kcr.session));
520			    kin.t1 = htonl(ktv.tv_sec);
521			    kin.t2 = htonl(ktv.tv_usec);
522			    kin.w1 = htonl(NFS_KERBTTL);
523			    kin.w2 = htonl(NFS_KERBTTL - 1);
524			    bzero((caddr_t)kivec, sizeof (kivec));
525
526			    /*
527			     * Encrypt kin in CBC mode using the session
528			     * key in kcr.
529			     */
530			    XXX
531
532			    /*
533			     * Finally, fill the timestamp verifier into the
534			     * authenticator and verifier.
535			     */
536			    ktick.kind = htonl(RPCAKN_FULLNAME);
537			    kverf.kind = htonl(RPCAKN_FULLNAME);
538			    NFS_KERBW1(ktick.kt) = kout.w1;
539			    ktick.kt.length = htonl(ktick.kt.length);
540			    kverf.verf.t1 = kout.t1;
541			    kverf.verf.t2 = kout.t2;
542			    kverf.verf.w2 = kout.w2;
543			    nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH;
544			}
545			setreuid(0, 0);
546#endif /* NFSKERB */
547		}
548	}
549	exit(0);
550}
551
552int
553getnfsargs(spec, nfsargsp)
554	char *spec;
555	struct nfs_args *nfsargsp;
556{
557	register CLIENT *clp;
558	struct hostent *hp;
559	static struct sockaddr_in saddr;
560#ifdef ISO
561	static struct sockaddr_iso isoaddr;
562	struct iso_addr *isop;
563	int isoflag = 0;
564#endif
565	struct timeval pertry, try;
566	enum clnt_stat clnt_stat;
567	int so = RPC_ANYSOCK, i, nfsvers, mntvers;
568	char *hostp, *delimp;
569#ifdef NFSKERB
570	char *cp;
571#endif
572	u_short tport;
573	static struct nfhret nfhret;
574	static char nam[MNAMELEN + 1];
575
576	strncpy(nam, spec, MNAMELEN);
577	nam[MNAMELEN] = '\0';
578	if ((delimp = strchr(spec, '@')) != NULL) {
579		hostp = delimp + 1;
580	} else if ((delimp = strchr(spec, ':')) != NULL) {
581		hostp = spec;
582		spec = delimp + 1;
583	} else {
584		warnx("no <host>:<dirpath> or <dirpath>@<host> spec");
585		return (0);
586	}
587	*delimp = '\0';
588	/*
589	 * DUMB!! Until the mount protocol works on iso transport, we must
590	 * supply both an iso and an inet address for the host.
591	 */
592#ifdef ISO
593	if (!strncmp(hostp, "iso=", 4)) {
594		u_short isoport;
595
596		hostp += 4;
597		isoflag++;
598		if ((delimp = strchr(hostp, '+')) == NULL) {
599			warnx("no iso+inet address");
600			return (0);
601		}
602		*delimp = '\0';
603		if ((isop = iso_addr(hostp)) == NULL) {
604			warnx("bad ISO address");
605			return (0);
606		}
607		memset(&isoaddr, 0, sizeof (isoaddr));
608		memmove(&isoaddr.siso_addr, isop, sizeof (struct iso_addr));
609		isoaddr.siso_len = sizeof (isoaddr);
610		isoaddr.siso_family = AF_ISO;
611		isoaddr.siso_tlen = 2;
612		isoport = htons(NFS_PORT);
613		memmove(TSEL(&isoaddr), &isoport, isoaddr.siso_tlen);
614		hostp = delimp + 1;
615	}
616#endif /* ISO */
617
618	/*
619	 * Handle an internet host address and reverse resolve it if
620	 * doing Kerberos.
621	 */
622	if (isdigit(*hostp)) {
623		if ((saddr.sin_addr.s_addr = inet_addr(hostp)) == -1) {
624			warnx("bad net address %s", hostp);
625			return (0);
626		}
627	} else if ((hp = gethostbyname(hostp)) != NULL)
628		memmove(&saddr.sin_addr, hp->h_addr, hp->h_length);
629	else {
630		warnx("can't get net id for host");
631		return (0);
632        }
633#ifdef NFSKERB
634	if ((nfsargsp->flags & NFSMNT_KERB)) {
635		if ((hp = gethostbyaddr((char *)&saddr.sin_addr.s_addr,
636		    sizeof (u_long), AF_INET)) == (struct hostent *)0) {
637			warnx("can't reverse resolve net address");
638			return (0);
639		}
640		memmove(&saddr.sin_addr, hp->h_addr, hp->h_length);
641		strncpy(inst, hp->h_name, INST_SZ);
642		inst[INST_SZ - 1] = '\0';
643		if (cp = strchr(inst, '.'))
644			*cp = '\0';
645	}
646#endif /* NFSKERB */
647
648	if (nfsargsp->flags & NFSMNT_NFSV3) {
649		nfsvers = 3;
650		mntvers = 3;
651	} else {
652		nfsvers = 2;
653		mntvers = 1;
654	}
655	nfhret.stat = EACCES;	/* Mark not yet successful */
656	while (retrycnt > 0) {
657		saddr.sin_family = AF_INET;
658		saddr.sin_port = htons(PMAPPORT);
659		if ((tport = port_no ? port_no :
660		     pmap_getport(&saddr, RPCPROG_NFS,
661		    		  nfsvers, nfsproto)) == 0) {
662			if ((opflags & ISBGRND) == 0)
663				clnt_pcreateerror("NFS Portmap");
664		} else {
665			saddr.sin_port = 0;
666			pertry.tv_sec = 10;
667			pertry.tv_usec = 0;
668			if (mnttcp_ok && nfsargsp->sotype == SOCK_STREAM)
669			    clp = clnttcp_create(&saddr, RPCPROG_MNT, mntvers,
670				&so, 0, 0);
671			else
672			    clp = clntudp_create(&saddr, RPCPROG_MNT, mntvers,
673				pertry, &so);
674			if (clp == NULL) {
675				if ((opflags & ISBGRND) == 0)
676					clnt_pcreateerror("Cannot MNT RPC");
677			} else {
678				clp->cl_auth = authunix_create_default();
679				try.tv_sec = 10;
680				try.tv_usec = 0;
681				if (nfsargsp->flags & NFSMNT_KERB)
682				    nfhret.auth = RPCAUTH_KERB4;
683				else
684				    nfhret.auth = RPCAUTH_UNIX;
685				nfhret.vers = mntvers;
686				clnt_stat = clnt_call(clp, RPCMNT_MOUNT,
687				    xdr_dir, spec, xdr_fh, &nfhret, try);
688				if (clnt_stat != RPC_SUCCESS) {
689					if ((opflags & ISBGRND) == 0)
690						warnx("%s", clnt_sperror(clp,
691						    "bad MNT RPC"));
692				} else {
693					auth_destroy(clp->cl_auth);
694					clnt_destroy(clp);
695					retrycnt = 0;
696				}
697			}
698		}
699		if (--retrycnt > 0) {
700			if (opflags & BGRND) {
701				opflags &= ~BGRND;
702				if (i = fork()) {
703					if (i == -1)
704						err(1, "nqnfs 2");
705					exit(0);
706				}
707				(void) setsid();
708				(void) close(STDIN_FILENO);
709				(void) close(STDOUT_FILENO);
710				(void) close(STDERR_FILENO);
711				(void) chdir("/");
712				opflags |= ISBGRND;
713			}
714			sleep(60);
715		}
716	}
717	if (nfhret.stat) {
718		if (opflags & ISBGRND)
719			exit(1);
720		warnx("can't access %s: %s", spec, strerror(nfhret.stat));
721		return (0);
722	}
723	saddr.sin_port = htons(tport);
724#ifdef ISO
725	if (isoflag) {
726		nfsargsp->addr = (struct sockaddr *) &isoaddr;
727		nfsargsp->addrlen = sizeof (isoaddr);
728	} else
729#endif /* ISO */
730	{
731		nfsargsp->addr = (struct sockaddr *) &saddr;
732		nfsargsp->addrlen = sizeof (saddr);
733	}
734	nfsargsp->fh = nfhret.nfh;
735	nfsargsp->fhsize = nfhret.fhsize;
736	nfsargsp->hostname = nam;
737	return (1);
738}
739
740/*
741 * xdr routines for mount rpc's
742 */
743int
744xdr_dir(xdrsp, dirp)
745	XDR *xdrsp;
746	char *dirp;
747{
748	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
749}
750
751int
752xdr_fh(xdrsp, np)
753	XDR *xdrsp;
754	register struct nfhret *np;
755{
756	register int i;
757	long auth, authcnt, authfnd = 0;
758
759	if (!xdr_u_long(xdrsp, &np->stat))
760		return (0);
761	if (np->stat)
762		return (1);
763	switch (np->vers) {
764	case 1:
765		np->fhsize = NFSX_V2FH;
766		return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
767	case 3:
768		if (!xdr_long(xdrsp, &np->fhsize))
769			return (0);
770		if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
771			return (0);
772		if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
773			return (0);
774		if (!xdr_long(xdrsp, &authcnt))
775			return (0);
776		for (i = 0; i < authcnt; i++) {
777			if (!xdr_long(xdrsp, &auth))
778				return (0);
779			if (auth == np->auth)
780				authfnd++;
781		}
782		/*
783		 * Some servers, such as DEC's OSF/1 return a nil authenticator
784		 * list to indicate RPCAUTH_UNIX.
785		 */
786		if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
787			np->stat = EAUTH;
788		return (1);
789	};
790	return (0);
791}
792
793void
794usage()
795{
796	(void)fprintf(stderr, "\
797usage: mount_nfs [-3KPTUbcdilqs] [-D deadthresh] [-I readdirsize]\n\
798       [-L leaseterm] [-R retrycnt] [-a maxreadahead] [-g maxgroups]\n\
799       [-m realm] [-o options] [-r readsize] [-t timeout] [-w writesize]\n\
800       [-x retrans] rhost:path node\n");
801	exit(1);
802}
803