mount_nfs.c revision 32008 
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 1.25 1997/12/24 00:58:39 imp 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#define ALTF_NFSV2	0x4000
109
110struct mntopt mopts[] = {
111	MOPT_STDOPTS,
112	MOPT_FORCE,
113	MOPT_UPDATE,
114	MOPT_ASYNC,
115	{ "bg", 0, ALTF_BG, 1 },
116	{ "conn", 1, ALTF_NOCONN, 1 },
117	{ "dumbtimer", 0, ALTF_DUMBTIMR, 1 },
118	{ "intr", 0, ALTF_INTR, 1 },
119#ifdef NFSKERB
120	{ "kerb", 0, ALTF_KERB, 1 },
121#endif
122	{ "nfsv3", 0, ALTF_NFSV3, 1 },
123	{ "rdirplus", 0, ALTF_RDIRPLUS, 1 },
124	{ "mntudp", 0, ALTF_MNTUDP, 1 },
125	{ "resvport", 0, ALTF_RESVPORT, 1 },
126#ifdef ISO
127	{ "seqpacket", 0, ALTF_SEQPACKET, 1 },
128#endif
129	{ "nqnfs", 0, ALTF_NQNFS, 1 },
130	{ "soft", 0, ALTF_SOFT, 1 },
131	{ "tcp", 0, ALTF_TCP, 1 },
132	{ "port=", 0, ALTF_PORT, 1 },
133	{ "nfsv2", 0, ALTF_NFSV2, 1 },
134	{ NULL }
135};
136
137struct nfs_args nfsdefargs = {
138	NFS_ARGSVERSION,
139	(struct sockaddr *)0,
140	sizeof (struct sockaddr_in),
141	SOCK_DGRAM,
142	0,
143	(u_char *)0,
144	0,
145	NFSMNT_RESVPORT,
146	NFS_WSIZE,
147	NFS_RSIZE,
148	NFS_READDIRSIZE,
149	10,
150	NFS_RETRANS,
151	NFS_MAXGRPS,
152	NFS_DEFRAHEAD,
153	NQ_DEFLEASE,
154	NQ_DEADTHRESH,
155	(char *)0,
156};
157
158struct nfhret {
159	u_long		stat;
160	long		vers;
161	long		auth;
162	long		fhsize;
163	u_char		nfh[NFSX_V3FHMAX];
164};
165#define	DEF_RETRY	10000
166#define	BGRND	1
167#define	ISBGRND	2
168int retrycnt = DEF_RETRY;
169int opflags = 0;
170int nfsproto = IPPROTO_UDP;
171int mnttcp_ok = 1;
172u_short port_no = 0;
173enum {
174	ANY,
175	V2,
176	V3
177} mountmode = ANY;
178
179#ifdef NFSKERB
180char inst[INST_SZ];
181char realm[REALM_SZ];
182struct {
183	u_long		kind;
184	KTEXT_ST	kt;
185} ktick;
186struct nfsrpc_nickverf kverf;
187struct nfsrpc_fullblock kin, kout;
188NFSKERBKEY_T kivec;
189CREDENTIALS kcr;
190struct timeval ktv;
191NFSKERBKEYSCHED_T kerb_keysched;
192#endif
193
194int	getnfsargs __P((char *, struct nfs_args *));
195#ifdef ISO
196struct	iso_addr *iso_addr __P((const char *));
197#endif
198void	set_rpc_maxgrouplist __P((int));
199void	usage __P((void)) __dead2;
200int	xdr_dir __P((XDR *, char *));
201int	xdr_fh __P((XDR *, struct nfhret *));
202
203/*
204 * Used to set mount flags with getmntopts.  Call with dir=TRUE to
205 * initialise altflags from the current mount flags.  Call with
206 * dir=FALSE to update mount flags with the new value of altflags after
207 * the call to getmntopts.
208 */
209static void
210setflags(int* altflags, int* nfsflags, int dir)
211{
212#define F2(af, nf)					\
213	if (dir) {					\
214		if (*nfsflags & NFSMNT_##nf)		\
215			*altflags |= ALTF_##af;		\
216		else					\
217			*altflags &= ~ALTF_##af;	\
218	} else {					\
219		if (*altflags & ALTF_##af)		\
220			*nfsflags |= NFSMNT_##nf;	\
221		else					\
222			*nfsflags &= ~NFSMNT_##nf;	\
223	}
224#define F(f)	F2(f,f)
225
226	F(NOCONN);
227	F(DUMBTIMR);
228	F2(INTR, INT);
229#ifdef NFSKERB
230	F(KERB);
231#endif
232	F(RDIRPLUS);
233	F(RESVPORT);
234	F(NQNFS);
235	F(SOFT);
236
237#undef F
238#undef F2
239}
240
241int
242main(argc, argv)
243	int argc;
244	char *argv[];
245{
246	register int c;
247	register struct nfs_args *nfsargsp;
248	struct nfs_args nfsargs;
249	struct nfsd_cargs ncd;
250	int mntflags, altflags, i, nfssvc_flag, num;
251	char *name, *p, *spec;
252	struct vfsconf vfc;
253	int error = 0;
254#ifdef NFSKERB
255	uid_t last_ruid;
256
257	last_ruid = -1;
258	(void)strcpy(realm, KRB_REALM);
259	if (sizeof (struct nfsrpc_nickverf) != RPCX_NICKVERF ||
260	    sizeof (struct nfsrpc_fullblock) != RPCX_FULLBLOCK ||
261	    ((char *)&ktick.kt) - ((char *)&ktick) != NFSX_UNSIGNED ||
262	    ((char *)ktick.kt.dat) - ((char *)&ktick) != 2 * NFSX_UNSIGNED)
263		fprintf(stderr, "Yikes! NFSKERB structs not packed!!\n");
264#endif /* NFSKERB */
265	retrycnt = DEF_RETRY;
266
267	mntflags = 0;
268	altflags = 0;
269	nfsargs = nfsdefargs;
270	nfsargsp = &nfsargs;
271	while ((c = getopt(argc, argv,
272	    "23a:bcdD:g:I:iKL:lm:No:PpqR:r:sTt:w:x:U")) != -1)
273		switch (c) {
274		case '2':
275			mountmode = V2;
276			break;
277		case '3':
278			mountmode = V3;
279			break;
280		case 'a':
281			num = strtol(optarg, &p, 10);
282			if (*p || num < 0)
283				errx(1, "illegal -a value -- %s", optarg);
284			nfsargsp->readahead = num;
285			nfsargsp->flags |= NFSMNT_READAHEAD;
286			break;
287		case 'b':
288			opflags |= BGRND;
289			break;
290		case 'c':
291			nfsargsp->flags |= NFSMNT_NOCONN;
292			break;
293		case 'D':
294			num = strtol(optarg, &p, 10);
295			if (*p || num <= 0)
296				errx(1, "illegal -D value -- %s", optarg);
297			nfsargsp->deadthresh = num;
298			nfsargsp->flags |= NFSMNT_DEADTHRESH;
299			break;
300		case 'd':
301			nfsargsp->flags |= NFSMNT_DUMBTIMR;
302			break;
303		case 'g':
304			num = strtol(optarg, &p, 10);
305			if (*p || num <= 0)
306				errx(1, "illegal -g value -- %s", optarg);
307#ifdef __FreeBSD__
308			set_rpc_maxgrouplist(num);
309#endif
310			nfsargsp->maxgrouplist = num;
311			nfsargsp->flags |= NFSMNT_MAXGRPS;
312			break;
313		case 'I':
314			num = strtol(optarg, &p, 10);
315			if (*p || num <= 0)
316				errx(1, "illegal -I value -- %s", optarg);
317			nfsargsp->readdirsize = num;
318			nfsargsp->flags |= NFSMNT_READDIRSIZE;
319			break;
320		case 'i':
321			nfsargsp->flags |= NFSMNT_INT;
322			break;
323#ifdef NFSKERB
324		case 'K':
325			nfsargsp->flags |= NFSMNT_KERB;
326			break;
327#endif
328		case 'L':
329			num = strtol(optarg, &p, 10);
330			if (*p || num < 2)
331				errx(1, "illegal -L value -- %s", optarg);
332			nfsargsp->leaseterm = num;
333			nfsargsp->flags |= NFSMNT_LEASETERM;
334			break;
335		case 'l':
336			nfsargsp->flags |= NFSMNT_RDIRPLUS;
337			break;
338#ifdef NFSKERB
339		case 'm':
340			(void)strncpy(realm, optarg, REALM_SZ - 1);
341			realm[REALM_SZ - 1] = '\0';
342			break;
343#endif
344		case 'N':
345			nfsargsp->flags &= ~NFSMNT_RESVPORT;
346			break;
347		case 'o':
348			altflags = 0;
349			setflags(&altflags, &nfsargsp->flags, TRUE);
350			if (mountmode == V2)
351				altflags |= ALTF_NFSV2;
352			else if (mountmode == V3)
353				altflags |= ALTF_NFSV3;
354			getmntopts(optarg, mopts, &mntflags, &altflags);
355			setflags(&altflags, &nfsargsp->flags, FALSE);
356			/*
357			 * Handle altflags which don't map directly to
358			 * mount flags.
359			 */
360			if(altflags & ALTF_BG)
361				opflags |= BGRND;
362			if(altflags & ALTF_MNTUDP)
363				mnttcp_ok = 0;
364#ifdef ISO
365			if(altflags & ALTF_SEQPACKET)
366				nfsargsp->sotype = SOCK_SEQPACKET;
367#endif
368			if(altflags & ALTF_TCP) {
369				nfsargsp->sotype = SOCK_STREAM;
370				nfsproto = IPPROTO_TCP;
371			}
372			if(altflags & ALTF_PORT)
373				port_no = atoi(strstr(optarg, "port=") + 5);
374			mountmode = ANY;
375			if(altflags & ALTF_NFSV2)
376				mountmode = V2;
377			if(altflags & ALTF_NFSV3)
378				mountmode = V3;
379			break;
380		case 'P':
381			/* obsolete for NFSMNT_RESVPORT, now default */
382			break;
383#ifdef ISO
384		case 'p':
385			nfsargsp->sotype = SOCK_SEQPACKET;
386			break;
387#endif
388		case 'q':
389			mountmode = V3;
390			nfsargsp->flags |= NFSMNT_NQNFS;
391			break;
392		case 'R':
393			num = strtol(optarg, &p, 10);
394			if (*p || num <= 0)
395				errx(1, "illegal -R value -- %s", optarg);
396			retrycnt = num;
397			break;
398		case 'r':
399			num = strtol(optarg, &p, 10);
400			if (*p || num <= 0)
401				errx(1, "illegal -r value -- %s", optarg);
402			nfsargsp->rsize = num;
403			nfsargsp->flags |= NFSMNT_RSIZE;
404			break;
405		case 's':
406			nfsargsp->flags |= NFSMNT_SOFT;
407			break;
408		case 'T':
409			nfsargsp->sotype = SOCK_STREAM;
410			nfsproto = IPPROTO_TCP;
411			break;
412		case 't':
413			num = strtol(optarg, &p, 10);
414			if (*p || num <= 0)
415				errx(1, "illegal -t value -- %s", optarg);
416			nfsargsp->timeo = num;
417			nfsargsp->flags |= NFSMNT_TIMEO;
418			break;
419		case 'w':
420			num = strtol(optarg, &p, 10);
421			if (*p || num <= 0)
422				errx(1, "illegal -w value -- %s", optarg);
423			nfsargsp->wsize = num;
424			nfsargsp->flags |= NFSMNT_WSIZE;
425			break;
426		case 'x':
427			num = strtol(optarg, &p, 10);
428			if (*p || num <= 0)
429				errx(1, "illegal -x value -- %s", optarg);
430			nfsargsp->retrans = num;
431			nfsargsp->flags |= NFSMNT_RETRANS;
432			break;
433		case 'U':
434			mnttcp_ok = 0;
435			break;
436		default:
437			usage();
438			break;
439		}
440	argc -= optind;
441	argv += optind;
442
443	if (argc != 2) {
444		usage();
445		/* NOTREACHED */
446	}
447
448	spec = *argv++;
449	name = *argv;
450
451	if (!getnfsargs(spec, nfsargsp))
452		exit(1);
453
454#ifdef __FreeBSD__
455	error = getvfsbyname("nfs", &vfc);
456	if (error && vfsisloadable("nfs")) {
457		if(vfsload("nfs"))
458			err(EX_OSERR, "vfsload(nfs)");
459		endvfsent();	/* clear cache */
460		error = getvfsbyname("nfs", &vfc);
461	}
462	if (error)
463		errx(EX_OSERR, "nfs filesystem is not available");
464
465	if (mount(vfc.vfc_name, name, mntflags, nfsargsp))
466		err(1, "%s", name);
467#else
468	if (mount("nfs", name, mntflags, nfsargsp))
469		err(1, "%s", name);
470#endif
471	if (nfsargsp->flags & (NFSMNT_NQNFS | NFSMNT_KERB)) {
472		if ((opflags & ISBGRND) == 0) {
473			if (i = fork()) {
474				if (i == -1)
475					err(1, "nqnfs 1");
476				exit(0);
477			}
478			(void) setsid();
479			(void) close(STDIN_FILENO);
480			(void) close(STDOUT_FILENO);
481			(void) close(STDERR_FILENO);
482			(void) chdir("/");
483		}
484		openlog("mount_nfs:", LOG_PID, LOG_DAEMON);
485		nfssvc_flag = NFSSVC_MNTD;
486		ncd.ncd_dirp = name;
487		while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) {
488			if (errno != ENEEDAUTH) {
489				syslog(LOG_ERR, "nfssvc err %m");
490				continue;
491			}
492			nfssvc_flag =
493			    NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL;
494#ifdef NFSKERB
495			/*
496			 * Set up as ncd_authuid for the kerberos call.
497			 * Must set ruid to ncd_authuid and reset the
498			 * ticket name iff ncd_authuid is not the same
499			 * as last time, so that the right ticket file
500			 * is found.
501			 * Get the Kerberos credential structure so that
502			 * we have the seesion key and get a ticket for
503			 * this uid.
504			 * For more info see the IETF Draft "Authentication
505			 * in ONC RPC".
506			 */
507			if (ncd.ncd_authuid != last_ruid) {
508				char buf[512];
509				(void)sprintf(buf, "%s%d",
510					      TKT_ROOT, ncd.ncd_authuid);
511				krb_set_tkt_string(buf);
512				last_ruid = ncd.ncd_authuid;
513			}
514			setreuid(ncd.ncd_authuid, 0);
515			kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr);
516			if (kret == RET_NOTKT) {
517		            kret = get_ad_tkt(NFS_KERBSRV, inst, realm,
518				DEFAULT_TKT_LIFE);
519			    if (kret == KSUCCESS)
520				kret = krb_get_cred(NFS_KERBSRV, inst, realm,
521				    &kcr);
522			}
523			if (kret == KSUCCESS)
524			    kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst,
525				realm, 0);
526
527			/*
528			 * Fill in the AKN_FULLNAME authenticator and verfier.
529			 * Along with the Kerberos ticket, we need to build
530			 * the timestamp verifier and encrypt it in CBC mode.
531			 */
532			if (kret == KSUCCESS &&
533			    ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED)
534			    && gettimeofday(&ktv, (struct timezone *)0) == 0) {
535			    ncd.ncd_authtype = RPCAUTH_KERB4;
536			    ncd.ncd_authstr = (u_char *)&ktick;
537			    ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) +
538				3 * NFSX_UNSIGNED;
539			    ncd.ncd_verfstr = (u_char *)&kverf;
540			    ncd.ncd_verflen = sizeof (kverf);
541			    memmove(ncd.ncd_key, kcr.session,
542				sizeof (kcr.session));
543			    kin.t1 = htonl(ktv.tv_sec);
544			    kin.t2 = htonl(ktv.tv_usec);
545			    kin.w1 = htonl(NFS_KERBTTL);
546			    kin.w2 = htonl(NFS_KERBTTL - 1);
547			    bzero((caddr_t)kivec, sizeof (kivec));
548
549			    /*
550			     * Encrypt kin in CBC mode using the session
551			     * key in kcr.
552			     */
553			    XXX
554
555			    /*
556			     * Finally, fill the timestamp verifier into the
557			     * authenticator and verifier.
558			     */
559			    ktick.kind = htonl(RPCAKN_FULLNAME);
560			    kverf.kind = htonl(RPCAKN_FULLNAME);
561			    NFS_KERBW1(ktick.kt) = kout.w1;
562			    ktick.kt.length = htonl(ktick.kt.length);
563			    kverf.verf.t1 = kout.t1;
564			    kverf.verf.t2 = kout.t2;
565			    kverf.verf.w2 = kout.w2;
566			    nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH;
567			}
568			setreuid(0, 0);
569#endif /* NFSKERB */
570		}
571	}
572	exit(0);
573}
574
575/*
576 * Return RPC_SUCCESS if server responds.
577 */
578enum clnt_stat
579pingnfsserver(addr, version, sotype)
580	struct sockaddr_in *addr;
581	int version;
582	int sotype;
583{
584	struct sockaddr_in sin;
585	int tport;
586	CLIENT *clp;
587	int so = RPC_ANYSOCK;
588	enum clnt_stat stat;
589	struct timeval pertry, try;
590
591	sin = *addr;
592
593	if ((tport = port_no ? port_no :
594	     pmap_getport(&sin, RPCPROG_NFS, version, nfsproto)) == 0) {
595		return rpc_createerr.cf_stat;
596	}
597
598	sin.sin_port = htons(tport);
599
600	pertry.tv_sec = 10;
601	pertry.tv_usec = 0;
602	if (sotype == SOCK_STREAM)
603		clp = clnttcp_create(&sin, RPCPROG_NFS, version,
604				     &so, 0, 0);
605	else
606		clp = clntudp_create(&sin, RPCPROG_NFS, version,
607				     pertry, &so);
608	if (clp == NULL)
609		return rpc_createerr.cf_stat;
610
611	try.tv_sec = 10;
612	try.tv_usec = 0;
613	stat = clnt_call(clp, NFSPROC_NULL,
614			 xdr_void, NULL, xdr_void, NULL, try);
615
616	clnt_destroy(clp);
617
618	return stat;
619}
620
621int
622getnfsargs(spec, nfsargsp)
623	char *spec;
624	struct nfs_args *nfsargsp;
625{
626	register CLIENT *clp;
627	struct hostent *hp;
628	static struct sockaddr_in saddr;
629#ifdef ISO
630	static struct sockaddr_iso isoaddr;
631	struct iso_addr *isop;
632	int isoflag = 0;
633#endif
634	struct timeval pertry, try;
635	enum clnt_stat clnt_stat;
636	int so = RPC_ANYSOCK, i, nfsvers, mntvers, orgcnt;
637	char *hostp, *delimp;
638#ifdef NFSKERB
639	char *cp;
640#endif
641	u_short tport;
642	static struct nfhret nfhret;
643	static char nam[MNAMELEN + 1];
644
645	strncpy(nam, spec, MNAMELEN);
646	nam[MNAMELEN] = '\0';
647	if ((delimp = strchr(spec, '@')) != NULL) {
648		hostp = delimp + 1;
649	} else if ((delimp = strchr(spec, ':')) != NULL) {
650		hostp = spec;
651		spec = delimp + 1;
652	} else {
653		warnx("no <host>:<dirpath> or <dirpath>@<host> spec");
654		return (0);
655	}
656	*delimp = '\0';
657	/*
658	 * DUMB!! Until the mount protocol works on iso transport, we must
659	 * supply both an iso and an inet address for the host.
660	 */
661#ifdef ISO
662	if (!strncmp(hostp, "iso=", 4)) {
663		u_short isoport;
664
665		hostp += 4;
666		isoflag++;
667		if ((delimp = strchr(hostp, '+')) == NULL) {
668			warnx("no iso+inet address");
669			return (0);
670		}
671		*delimp = '\0';
672		if ((isop = iso_addr(hostp)) == NULL) {
673			warnx("bad ISO address");
674			return (0);
675		}
676		memset(&isoaddr, 0, sizeof (isoaddr));
677		memmove(&isoaddr.siso_addr, isop, sizeof (struct iso_addr));
678		isoaddr.siso_len = sizeof (isoaddr);
679		isoaddr.siso_family = AF_ISO;
680		isoaddr.siso_tlen = 2;
681		isoport = htons(NFS_PORT);
682		memmove(TSEL(&isoaddr), &isoport, isoaddr.siso_tlen);
683		hostp = delimp + 1;
684	}
685#endif /* ISO */
686
687	/*
688	 * Handle an internet host address and reverse resolve it if
689	 * doing Kerberos.
690	 */
691	if (isdigit(*hostp)) {
692		if ((saddr.sin_addr.s_addr = inet_addr(hostp)) == -1) {
693			warnx("bad net address %s", hostp);
694			return (0);
695		}
696	} else if ((hp = gethostbyname(hostp)) != NULL)
697		memmove(&saddr.sin_addr, hp->h_addr,
698		    MIN(hp->h_length, sizeof(saddr.sin_addr)));
699	else {
700		warnx("can't get net id for host");
701		return (0);
702        }
703#ifdef NFSKERB
704	if ((nfsargsp->flags & NFSMNT_KERB)) {
705		if ((hp = gethostbyaddr((char *)&saddr.sin_addr.s_addr,
706		    sizeof (u_long), AF_INET)) == (struct hostent *)0) {
707			warnx("can't reverse resolve net address");
708			return (0);
709		}
710		memmove(&saddr.sin_addr, hp->h_addr,
711		    MIN(hp->h_length, sizeof(saddr.sin_addr)));
712		strncpy(inst, hp->h_name, INST_SZ);
713		inst[INST_SZ - 1] = '\0';
714		if (cp = strchr(inst, '.'))
715			*cp = '\0';
716	}
717#endif /* NFSKERB */
718
719	orgcnt = retrycnt;
720tryagain:
721	if (mountmode == ANY || mountmode == V3) {
722		nfsvers = 3;
723		mntvers = 3;
724		nfsargsp->flags |= NFSMNT_NFSV3;
725	} else {
726		nfsvers = 2;
727		mntvers = 1;
728		nfsargsp->flags &= ~NFSMNT_NFSV3;
729	}
730	nfhret.stat = EACCES;	/* Mark not yet successful */
731	while (retrycnt > 0) {
732		saddr.sin_family = AF_INET;
733		saddr.sin_port = htons(PMAPPORT);
734		if ((tport = port_no ? port_no :
735		     pmap_getport(&saddr, RPCPROG_NFS,
736		    		  nfsvers, nfsproto)) == 0) {
737			if ((opflags & ISBGRND) == 0)
738				clnt_pcreateerror("NFS Portmap");
739		} else {
740			/*
741			 * First ping the nfs server to see if it supports
742			 * the version of the protocol we want to use.
743			 */
744			clnt_stat = pingnfsserver(&saddr, nfsvers,
745						  nfsargsp->sotype);
746			if (clnt_stat == RPC_PROGVERSMISMATCH) {
747				if (mountmode == ANY) {
748					mountmode = V2;
749					goto tryagain;
750				} else {
751					errx(1, "Can't contact NFS server");
752				}
753			}
754			saddr.sin_port = 0;
755			pertry.tv_sec = 10;
756			pertry.tv_usec = 0;
757			if (mnttcp_ok && nfsargsp->sotype == SOCK_STREAM)
758			    clp = clnttcp_create(&saddr, RPCPROG_MNT, mntvers,
759				&so, 0, 0);
760			else
761			    clp = clntudp_create(&saddr, RPCPROG_MNT, mntvers,
762				pertry, &so);
763			if (clp == NULL) {
764				if ((opflags & ISBGRND) == 0)
765					clnt_pcreateerror("Cannot MNT RPC");
766			} else {
767				clp->cl_auth = authunix_create_default();
768				try.tv_sec = 10;
769				try.tv_usec = 0;
770				if (nfsargsp->flags & NFSMNT_KERB)
771				    nfhret.auth = RPCAUTH_KERB4;
772				else
773				    nfhret.auth = RPCAUTH_UNIX;
774				nfhret.vers = mntvers;
775				clnt_stat = clnt_call(clp, RPCMNT_MOUNT,
776				    xdr_dir, spec, xdr_fh, &nfhret, try);
777				if (clnt_stat != RPC_SUCCESS) {
778					if (clnt_stat == RPC_PROGVERSMISMATCH) {
779						if (mountmode == ANY) {
780							mountmode = V2;
781							goto tryagain;
782						} else {
783							errx(1, "%s",
784							     clnt_sperror(clp, "MNT RPC"));
785						}
786					}
787					if ((opflags & ISBGRND) == 0)
788						warnx("%s", clnt_sperror(clp,
789						    "bad MNT RPC"));
790				} else {
791					auth_destroy(clp->cl_auth);
792					clnt_destroy(clp);
793					retrycnt = 0;
794				}
795			}
796		}
797		if (--retrycnt > 0) {
798			if (opflags & BGRND) {
799				opflags &= ~BGRND;
800				if (i = fork()) {
801					if (i == -1)
802						err(1, "nqnfs 2");
803					exit(0);
804				}
805				(void) setsid();
806				(void) close(STDIN_FILENO);
807				(void) close(STDOUT_FILENO);
808				(void) close(STDERR_FILENO);
809				(void) chdir("/");
810				opflags |= ISBGRND;
811			}
812			sleep(60);
813		}
814	}
815	if (nfhret.stat) {
816		if (opflags & ISBGRND)
817			exit(1);
818		warnx("can't access %s: %s", spec, strerror(nfhret.stat));
819		return (0);
820	}
821	saddr.sin_port = htons(tport);
822#ifdef ISO
823	if (isoflag) {
824		nfsargsp->addr = (struct sockaddr *) &isoaddr;
825		nfsargsp->addrlen = sizeof (isoaddr);
826	} else
827#endif /* ISO */
828	{
829		nfsargsp->addr = (struct sockaddr *) &saddr;
830		nfsargsp->addrlen = sizeof (saddr);
831	}
832	nfsargsp->fh = nfhret.nfh;
833	nfsargsp->fhsize = nfhret.fhsize;
834	nfsargsp->hostname = nam;
835	return (1);
836}
837
838/*
839 * xdr routines for mount rpc's
840 */
841int
842xdr_dir(xdrsp, dirp)
843	XDR *xdrsp;
844	char *dirp;
845{
846	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
847}
848
849int
850xdr_fh(xdrsp, np)
851	XDR *xdrsp;
852	register struct nfhret *np;
853{
854	register int i;
855	long auth, authcnt, authfnd = 0;
856
857	if (!xdr_u_long(xdrsp, &np->stat))
858		return (0);
859	if (np->stat)
860		return (1);
861	switch (np->vers) {
862	case 1:
863		np->fhsize = NFSX_V2FH;
864		return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
865	case 3:
866		if (!xdr_long(xdrsp, &np->fhsize))
867			return (0);
868		if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
869			return (0);
870		if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
871			return (0);
872		if (!xdr_long(xdrsp, &authcnt))
873			return (0);
874		for (i = 0; i < authcnt; i++) {
875			if (!xdr_long(xdrsp, &auth))
876				return (0);
877			if (auth == np->auth)
878				authfnd++;
879		}
880		/*
881		 * Some servers, such as DEC's OSF/1 return a nil authenticator
882		 * list to indicate RPCAUTH_UNIX.
883		 */
884		if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
885			np->stat = EAUTH;
886		return (1);
887	};
888	return (0);
889}
890
891void
892usage()
893{
894	(void)fprintf(stderr, "\
895usage: mount_nfs [-23KPTUbcdilqs] [-D deadthresh] [-I readdirsize]\n\
896       [-L leaseterm] [-R retrycnt] [-a maxreadahead] [-g maxgroups]\n\
897       [-m realm] [-o options] [-r readsize] [-t timeout] [-w writesize]\n\
898       [-x retrans] rhost:path node\n");
899	exit(1);
900}
901