mount_nfs.c revision 52679 
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 52679 1999-10-30 17:56:47Z green $";
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 ISO
61#include <netiso/iso.h>
62#endif
63
64#ifdef NFSKERB
65#include <kerberosIV/des.h>
66#include <kerberosIV/krb.h>
67#endif
68
69#include <nfs/rpcv2.h>
70#include <nfs/nfsproto.h>
71#include <nfs/nfs.h>
72#include <nfs/nqnfs.h>
73
74#include <arpa/inet.h>
75
76#include <ctype.h>
77#include <err.h>
78#include <errno.h>
79#include <netdb.h>
80#include <stdio.h>
81#include <stdlib.h>
82#include <strings.h>
83#include <sysexits.h>
84#include <unistd.h>
85
86#include "mntopts.h"
87
88#define	ALTF_BG		0x1
89#define ALTF_NOCONN	0x2
90#define ALTF_DUMBTIMR	0x4
91#define ALTF_INTR	0x8
92#define ALTF_KERB	0x10
93#define ALTF_NFSV3	0x20
94#define ALTF_RDIRPLUS	0x40
95#define	ALTF_MNTUDP	0x80
96#define ALTF_RESVPORT	0x100
97#define ALTF_SEQPACKET	0x200
98#define ALTF_NQNFS	0x400
99#define ALTF_SOFT	0x800
100#define ALTF_TCP	0x1000
101#define ALTF_PORT	0x2000
102#define ALTF_NFSV2	0x4000
103#define ALTF_ACREGMIN	0x8000
104#define ALTF_ACREGMAX	0x10000
105#define ALTF_ACDIRMIN	0x20000
106#define ALTF_ACDIRMAX	0x40000
107
108struct mntopt mopts[] = {
109	MOPT_STDOPTS,
110	MOPT_FORCE,
111	MOPT_UPDATE,
112	MOPT_ASYNC,
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	{ "nfsv2", 0, ALTF_NFSV2, 1 },
132	{ "acregmin=", 0, ALTF_ACREGMIN, 1 },
133	{ "acregmax=", 0, ALTF_ACREGMAX, 1 },
134	{ "acdirmin=", 0, ALTF_ACDIRMIN, 1 },
135	{ "acdirmax=", 0, ALTF_ACDIRMAX, 1 },
136	{ NULL }
137};
138
139struct nfs_args nfsdefargs = {
140	NFS_ARGSVERSION,
141	(struct sockaddr *)0,
142	sizeof (struct sockaddr_in),
143	SOCK_DGRAM,
144	0,
145	(u_char *)0,
146	0,
147	NFSMNT_RESVPORT,
148	NFS_WSIZE,
149	NFS_RSIZE,
150	NFS_READDIRSIZE,
151	10,
152	NFS_RETRANS,
153	NFS_MAXGRPS,
154	NFS_DEFRAHEAD,
155	NQ_DEFLEASE,
156	NQ_DEADTHRESH,
157	(char *)0,
158	/* args version 4 */
159	NFS_MINATTRTIMO,
160	NFS_MAXATTRTIMO,
161	NFS_MINDIRATTRTIMO,
162	NFS_MAXDIRATTRTIMO,
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	DEF_RETRY	10000
173#define	BGRND	1
174#define	ISBGRND	2
175int retrycnt = DEF_RETRY;
176int opflags = 0;
177int nfsproto = IPPROTO_UDP;
178int mnttcp_ok = 1;
179u_short port_no = 0;
180enum {
181	ANY,
182	V2,
183	V3
184} mountmode = ANY;
185
186#ifdef NFSKERB
187char inst[INST_SZ];
188char realm[REALM_SZ];
189struct {
190	u_long		kind;
191	KTEXT_ST	kt;
192} ktick;
193struct nfsrpc_nickverf kverf;
194struct nfsrpc_fullblock kin, kout;
195NFSKERBKEY_T kivec;
196CREDENTIALS kcr;
197struct timeval ktv;
198NFSKERBKEYSCHED_T kerb_keysched;
199#endif
200
201int	getnfsargs __P((char *, struct nfs_args *));
202#ifdef ISO
203struct	iso_addr *iso_addr __P((const char *));
204#endif
205void	set_rpc_maxgrouplist __P((int));
206void	usage __P((void)) __dead2;
207int	xdr_dir __P((XDR *, char *));
208int	xdr_fh __P((XDR *, struct nfhret *));
209
210/*
211 * Used to set mount flags with getmntopts.  Call with dir=TRUE to
212 * initialize altflags from the current mount flags.  Call with
213 * dir=FALSE to update mount flags with the new value of altflags after
214 * the call to getmntopts.
215 */
216static void
217setflags(int* altflags, int* nfsflags, int dir)
218{
219#define F2(af, nf)					\
220	if (dir) {					\
221		if (*nfsflags & NFSMNT_##nf)		\
222			*altflags |= ALTF_##af;		\
223		else					\
224			*altflags &= ~ALTF_##af;	\
225	} else {					\
226		if (*altflags & ALTF_##af)		\
227			*nfsflags |= NFSMNT_##nf;	\
228		else					\
229			*nfsflags &= ~NFSMNT_##nf;	\
230	}
231#define F(f)	F2(f,f)
232
233	F(NOCONN);
234	F(DUMBTIMR);
235	F2(INTR, INT);
236#ifdef NFSKERB
237	F(KERB);
238#endif
239	F(RDIRPLUS);
240	F(RESVPORT);
241	F(NQNFS);
242	F(SOFT);
243
244#undef F
245#undef F2
246}
247
248int
249main(argc, argv)
250	int argc;
251	char *argv[];
252{
253	register int c;
254	register struct nfs_args *nfsargsp;
255	struct nfs_args nfsargs;
256	struct nfsd_cargs ncd;
257	int mntflags, altflags, i, nfssvc_flag, num;
258	char *name, *p, *spec;
259	char mntpath[MAXPATHLEN];
260	struct vfsconf vfc;
261	int error = 0;
262#ifdef NFSKERB
263	uid_t last_ruid;
264
265	last_ruid = -1;
266	(void)strcpy(realm, KRB_REALM);
267	if (sizeof (struct nfsrpc_nickverf) != RPCX_NICKVERF ||
268	    sizeof (struct nfsrpc_fullblock) != RPCX_FULLBLOCK ||
269	    ((char *)&ktick.kt) - ((char *)&ktick) != NFSX_UNSIGNED ||
270	    ((char *)ktick.kt.dat) - ((char *)&ktick) != 2 * NFSX_UNSIGNED)
271		fprintf(stderr, "Yikes! NFSKERB structs not packed!!\n");
272#endif /* NFSKERB */
273	retrycnt = DEF_RETRY;
274
275	mntflags = 0;
276	altflags = 0;
277	nfsargs = nfsdefargs;
278	nfsargsp = &nfsargs;
279	while ((c = getopt(argc, argv,
280	    "23a:bcdD:g:I:iKL:lm:No:PpqR:r:sTt:w:x:U")) != -1)
281		switch (c) {
282		case '2':
283			mountmode = V2;
284			break;
285		case '3':
286			mountmode = V3;
287			break;
288		case 'a':
289			num = strtol(optarg, &p, 10);
290			if (*p || num < 0)
291				errx(1, "illegal -a value -- %s", optarg);
292			nfsargsp->readahead = num;
293			nfsargsp->flags |= NFSMNT_READAHEAD;
294			break;
295		case 'b':
296			opflags |= BGRND;
297			break;
298		case 'c':
299			nfsargsp->flags |= NFSMNT_NOCONN;
300			break;
301		case 'D':
302			num = strtol(optarg, &p, 10);
303			if (*p || num <= 0)
304				errx(1, "illegal -D value -- %s", optarg);
305			nfsargsp->deadthresh = num;
306			nfsargsp->flags |= NFSMNT_DEADTHRESH;
307			break;
308		case 'd':
309			nfsargsp->flags |= NFSMNT_DUMBTIMR;
310			break;
311		case 'g':
312			num = strtol(optarg, &p, 10);
313			if (*p || num <= 0)
314				errx(1, "illegal -g value -- %s", optarg);
315#ifdef __FreeBSD__
316			set_rpc_maxgrouplist(num);
317#endif
318			nfsargsp->maxgrouplist = num;
319			nfsargsp->flags |= NFSMNT_MAXGRPS;
320			break;
321		case 'I':
322			num = strtol(optarg, &p, 10);
323			if (*p || num <= 0)
324				errx(1, "illegal -I value -- %s", optarg);
325			nfsargsp->readdirsize = num;
326			nfsargsp->flags |= NFSMNT_READDIRSIZE;
327			break;
328		case 'i':
329			nfsargsp->flags |= NFSMNT_INT;
330			break;
331#ifdef NFSKERB
332		case 'K':
333			nfsargsp->flags |= NFSMNT_KERB;
334			break;
335#endif
336		case 'L':
337			num = strtol(optarg, &p, 10);
338			if (*p || num < 2)
339				errx(1, "illegal -L value -- %s", optarg);
340			nfsargsp->leaseterm = num;
341			nfsargsp->flags |= NFSMNT_LEASETERM;
342			break;
343		case 'l':
344			nfsargsp->flags |= NFSMNT_RDIRPLUS;
345			break;
346#ifdef NFSKERB
347		case 'm':
348			(void)strncpy(realm, optarg, REALM_SZ - 1);
349			realm[REALM_SZ - 1] = '\0';
350			break;
351#endif
352		case 'N':
353			nfsargsp->flags &= ~NFSMNT_RESVPORT;
354			break;
355		case 'o':
356			altflags = 0;
357			setflags(&altflags, &nfsargsp->flags, TRUE);
358			if (mountmode == V2)
359				altflags |= ALTF_NFSV2;
360			else if (mountmode == V3)
361				altflags |= ALTF_NFSV3;
362			getmntopts(optarg, mopts, &mntflags, &altflags);
363			setflags(&altflags, &nfsargsp->flags, FALSE);
364			/*
365			 * Handle altflags which don't map directly to
366			 * mount flags.
367			 */
368			if(altflags & ALTF_BG)
369				opflags |= BGRND;
370			if(altflags & ALTF_MNTUDP)
371				mnttcp_ok = 0;
372#ifdef ISO
373			if(altflags & ALTF_SEQPACKET)
374				nfsargsp->sotype = SOCK_SEQPACKET;
375#endif
376			if(altflags & ALTF_TCP) {
377				nfsargsp->sotype = SOCK_STREAM;
378				nfsproto = IPPROTO_TCP;
379			}
380			if(altflags & ALTF_PORT)
381				port_no = atoi(strstr(optarg, "port=") + 5);
382			mountmode = ANY;
383			if(altflags & ALTF_NFSV2)
384				mountmode = V2;
385			if(altflags & ALTF_NFSV3)
386				mountmode = V3;
387			if(altflags & ALTF_ACREGMIN)
388				nfsargsp->acregmin = atoi(strstr(optarg,
389				    "acregmin=") + 9);
390			if(altflags & ALTF_ACREGMAX)
391				nfsargsp->acregmax = atoi(strstr(optarg,
392				    "acregmax=") + 9);
393			if(altflags & ALTF_ACDIRMIN)
394				nfsargsp->acdirmin = atoi(strstr(optarg,
395				    "acdirmin=") + 9);
396			if(altflags & ALTF_ACDIRMAX)
397				nfsargsp->acdirmax = atoi(strstr(optarg,
398				    "acdirmax=") + 9);
399			break;
400		case 'P':
401			/* obsolete for NFSMNT_RESVPORT, now default */
402			break;
403#ifdef ISO
404		case 'p':
405			nfsargsp->sotype = SOCK_SEQPACKET;
406			break;
407#endif
408		case 'q':
409			mountmode = V3;
410			nfsargsp->flags |= NFSMNT_NQNFS;
411			break;
412		case 'R':
413			num = strtol(optarg, &p, 10);
414			if (*p || num <= 0)
415				errx(1, "illegal -R value -- %s", optarg);
416			retrycnt = num;
417			break;
418		case 'r':
419			num = strtol(optarg, &p, 10);
420			if (*p || num <= 0)
421				errx(1, "illegal -r value -- %s", optarg);
422			nfsargsp->rsize = num;
423			nfsargsp->flags |= NFSMNT_RSIZE;
424			break;
425		case 's':
426			nfsargsp->flags |= NFSMNT_SOFT;
427			break;
428		case 'T':
429			nfsargsp->sotype = SOCK_STREAM;
430			nfsproto = IPPROTO_TCP;
431			break;
432		case 't':
433			num = strtol(optarg, &p, 10);
434			if (*p || num <= 0)
435				errx(1, "illegal -t value -- %s", optarg);
436			nfsargsp->timeo = num;
437			nfsargsp->flags |= NFSMNT_TIMEO;
438			break;
439		case 'w':
440			num = strtol(optarg, &p, 10);
441			if (*p || num <= 0)
442				errx(1, "illegal -w value -- %s", optarg);
443			nfsargsp->wsize = num;
444			nfsargsp->flags |= NFSMNT_WSIZE;
445			break;
446		case 'x':
447			num = strtol(optarg, &p, 10);
448			if (*p || num <= 0)
449				errx(1, "illegal -x value -- %s", optarg);
450			nfsargsp->retrans = num;
451			nfsargsp->flags |= NFSMNT_RETRANS;
452			break;
453		case 'U':
454			mnttcp_ok = 0;
455			break;
456		default:
457			usage();
458			break;
459		}
460	argc -= optind;
461	argv += optind;
462
463	if (argc != 2) {
464		usage();
465		/* NOTREACHED */
466	}
467
468	spec = *argv++;
469	name = *argv;
470
471	if (!getnfsargs(spec, nfsargsp))
472		exit(1);
473
474	/* resolve the mountpoint with realpath(3) */
475	(void)checkpath(name, mntpath);
476
477#ifdef __FreeBSD__
478	error = getvfsbyname("nfs", &vfc);
479	if (error && vfsisloadable("nfs")) {
480		if(vfsload("nfs"))
481			err(EX_OSERR, "vfsload(nfs)");
482		endvfsent();	/* clear cache */
483		error = getvfsbyname("nfs", &vfc);
484	}
485	if (error)
486		errx(EX_OSERR, "nfs filesystem is not available");
487
488	if (mount(vfc.vfc_name, mntpath, mntflags, nfsargsp))
489		err(1, "%s", mntpath);
490#else
491	if (mount("nfs", mntpath, mntflags, nfsargsp))
492		err(1, "%s", mntpath);
493#endif
494	if (nfsargsp->flags & (NFSMNT_NQNFS | NFSMNT_KERB)) {
495		if ((opflags & ISBGRND) == 0) {
496			if ((i = fork())) {
497				if (i == -1)
498					err(1, "nqnfs 1");
499				exit(0);
500			}
501			(void) setsid();
502			(void) close(STDIN_FILENO);
503			(void) close(STDOUT_FILENO);
504			(void) close(STDERR_FILENO);
505			(void) chdir("/");
506		}
507		openlog("mount_nfs:", LOG_PID, LOG_DAEMON);
508		nfssvc_flag = NFSSVC_MNTD;
509		ncd.ncd_dirp = mntpath;
510		while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) {
511			if (errno != ENEEDAUTH) {
512				syslog(LOG_ERR, "nfssvc err %m");
513				continue;
514			}
515			nfssvc_flag =
516			    NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL;
517#ifdef NFSKERB
518			/*
519			 * Set up as ncd_authuid for the kerberos call.
520			 * Must set ruid to ncd_authuid and reset the
521			 * ticket name iff ncd_authuid is not the same
522			 * as last time, so that the right ticket file
523			 * is found.
524			 * Get the Kerberos credential structure so that
525			 * we have the session key and get a ticket for
526			 * this uid.
527			 * For more info see the IETF Draft "Authentication
528			 * in ONC RPC".
529			 */
530			if (ncd.ncd_authuid != last_ruid) {
531				char buf[512];
532				(void)sprintf(buf, "%s%d",
533					      TKT_ROOT, ncd.ncd_authuid);
534				krb_set_tkt_string(buf);
535				last_ruid = ncd.ncd_authuid;
536			}
537			setreuid(ncd.ncd_authuid, 0);
538			kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr);
539			if (kret == RET_NOTKT) {
540		            kret = get_ad_tkt(NFS_KERBSRV, inst, realm,
541				DEFAULT_TKT_LIFE);
542			    if (kret == KSUCCESS)
543				kret = krb_get_cred(NFS_KERBSRV, inst, realm,
544				    &kcr);
545			}
546			if (kret == KSUCCESS)
547			    kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst,
548				realm, 0);
549
550			/*
551			 * Fill in the AKN_FULLNAME authenticator and verifier.
552			 * Along with the Kerberos ticket, we need to build
553			 * the timestamp verifier and encrypt it in CBC mode.
554			 */
555			if (kret == KSUCCESS &&
556			    ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED)
557			    && gettimeofday(&ktv, (struct timezone *)0) == 0) {
558			    ncd.ncd_authtype = RPCAUTH_KERB4;
559			    ncd.ncd_authstr = (u_char *)&ktick;
560			    ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) +
561				3 * NFSX_UNSIGNED;
562			    ncd.ncd_verfstr = (u_char *)&kverf;
563			    ncd.ncd_verflen = sizeof (kverf);
564			    memmove(ncd.ncd_key, kcr.session,
565				sizeof (kcr.session));
566			    kin.t1 = htonl(ktv.tv_sec);
567			    kin.t2 = htonl(ktv.tv_usec);
568			    kin.w1 = htonl(NFS_KERBTTL);
569			    kin.w2 = htonl(NFS_KERBTTL - 1);
570			    bzero((caddr_t)kivec, sizeof (kivec));
571
572			    /*
573			     * Encrypt kin in CBC mode using the session
574			     * key in kcr.
575			     */
576			    XXX
577
578			    /*
579			     * Finally, fill the timestamp verifier into the
580			     * authenticator and verifier.
581			     */
582			    ktick.kind = htonl(RPCAKN_FULLNAME);
583			    kverf.kind = htonl(RPCAKN_FULLNAME);
584			    NFS_KERBW1(ktick.kt) = kout.w1;
585			    ktick.kt.length = htonl(ktick.kt.length);
586			    kverf.verf.t1 = kout.t1;
587			    kverf.verf.t2 = kout.t2;
588			    kverf.verf.w2 = kout.w2;
589			    nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH;
590			}
591			setreuid(0, 0);
592#endif /* NFSKERB */
593		}
594	}
595	exit(0);
596}
597
598/*
599 * Return RPC_SUCCESS if server responds.
600 */
601enum clnt_stat
602pingnfsserver(addr, version, sotype)
603	struct sockaddr_in *addr;
604	int version;
605	int sotype;
606{
607	struct sockaddr_in sin;
608	int tport;
609	CLIENT *clp;
610	int so = RPC_ANYSOCK;
611	enum clnt_stat stat;
612	struct timeval pertry, try;
613
614	sin = *addr;
615
616	if ((tport = port_no ? port_no :
617	     pmap_getport(&sin, RPCPROG_NFS, version, nfsproto)) == 0) {
618		return rpc_createerr.cf_stat;
619	}
620
621	sin.sin_port = htons(tport);
622
623	pertry.tv_sec = 10;
624	pertry.tv_usec = 0;
625	if (sotype == SOCK_STREAM)
626		clp = clnttcp_create(&sin, RPCPROG_NFS, version,
627				     &so, 0, 0);
628	else
629		clp = clntudp_create(&sin, RPCPROG_NFS, version,
630				     pertry, &so);
631	if (clp == NULL)
632		return rpc_createerr.cf_stat;
633
634	try.tv_sec = 10;
635	try.tv_usec = 0;
636	stat = clnt_call(clp, NFSPROC_NULL,
637			 xdr_void, NULL, xdr_void, NULL, try);
638
639	clnt_destroy(clp);
640
641	return stat;
642}
643
644int
645getnfsargs(spec, nfsargsp)
646	char *spec;
647	struct nfs_args *nfsargsp;
648{
649	register CLIENT *clp;
650	struct hostent *hp;
651	static struct sockaddr_in saddr;
652#ifdef ISO
653	static struct sockaddr_iso isoaddr;
654	struct iso_addr *isop;
655	int isoflag = 0;
656#endif
657	struct timeval pertry, try;
658	enum clnt_stat clnt_stat;
659	int so = RPC_ANYSOCK, i, nfsvers, mntvers, orgcnt, speclen;
660	char *hostp, *delimp;
661#ifdef NFSKERB
662	char *cp;
663#endif
664	u_short tport;
665	size_t len;
666	static struct nfhret nfhret;
667	static char nam[MNAMELEN + 1];
668
669	tport = 0;
670
671	if ((delimp = strchr(spec, ':')) != NULL) {
672		hostp = spec;
673		spec = delimp + 1;
674	} else if ((delimp = strrchr(spec, '@')) != NULL) {
675		warnx("path@server syntax is deprecated, use server:path");
676		hostp = delimp + 1;
677	} else {
678		warnx("no <host>:<dirpath> nfs-name");
679		return (0);
680	}
681
682	*delimp = '\0';
683
684	/*
685	 * If there has been a trailing slash at mounttime it seems
686	 * that some mountd implementations fail to remove the mount
687	 * entries from their mountlist while unmounting.
688	 */
689	for (speclen = strlen(spec);
690		speclen > 1 && spec[speclen - 1] == '/';
691		speclen--)
692		spec[speclen - 1] = '\0';
693	if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
694		warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
695		return (0);
696	}
697	/* Make both '@' and ':' notations equal */
698	if (*hostp != '\0') {
699		len = strlen(hostp);
700		memmove(nam, hostp, len);
701		nam[len] = ':';
702		memmove(nam + len + 1, spec, speclen);
703		nam[len + speclen + 1] = '\0';
704	}
705	/*
706	 * DUMB!! Until the mount protocol works on iso transport, we must
707	 * supply both an iso and an inet address for the host.
708	 */
709#ifdef ISO
710	if (!strncmp(hostp, "iso=", 4)) {
711		u_short isoport;
712
713		hostp += 4;
714		isoflag++;
715		if ((delimp = strchr(hostp, '+')) == NULL) {
716			warnx("no iso+inet address");
717			return (0);
718		}
719		*delimp = '\0';
720		if ((isop = iso_addr(hostp)) == NULL) {
721			warnx("bad ISO address");
722			return (0);
723		}
724		memset(&isoaddr, 0, sizeof (isoaddr));
725		memmove(&isoaddr.siso_addr, isop, sizeof (struct iso_addr));
726		isoaddr.siso_len = sizeof (isoaddr);
727		isoaddr.siso_family = AF_ISO;
728		isoaddr.siso_tlen = 2;
729		isoport = htons(NFS_PORT);
730		memmove(TSEL(&isoaddr), &isoport, isoaddr.siso_tlen);
731		hostp = delimp + 1;
732	}
733#endif /* ISO */
734
735	/*
736	 * Handle an internet host address and reverse resolve it if
737	 * doing Kerberos.
738	 */
739	if (isdigit(*hostp)) {
740		if ((saddr.sin_addr.s_addr = inet_addr(hostp)) == -1) {
741			warnx("bad net address %s", hostp);
742			return (0);
743		}
744	} else if ((hp = gethostbyname(hostp)) != NULL)
745		memmove(&saddr.sin_addr, hp->h_addr,
746		    MIN(hp->h_length, sizeof(saddr.sin_addr)));
747	else {
748		warnx("can't get net id for host");
749		return (0);
750        }
751#ifdef NFSKERB
752	if ((nfsargsp->flags & NFSMNT_KERB)) {
753		if ((hp = gethostbyaddr((char *)&saddr.sin_addr.s_addr,
754		    sizeof (u_long), AF_INET)) == (struct hostent *)0) {
755			warnx("can't reverse resolve net address");
756			return (0);
757		}
758		memmove(&saddr.sin_addr, hp->h_addr,
759		    MIN(hp->h_length, sizeof(saddr.sin_addr)));
760		strncpy(inst, hp->h_name, INST_SZ);
761		inst[INST_SZ - 1] = '\0';
762		if (cp = strchr(inst, '.'))
763			*cp = '\0';
764	}
765#endif /* NFSKERB */
766
767	orgcnt = retrycnt;
768tryagain:
769	if (mountmode == ANY || mountmode == V3) {
770		nfsvers = 3;
771		mntvers = 3;
772		nfsargsp->flags |= NFSMNT_NFSV3;
773	} else {
774		nfsvers = 2;
775		mntvers = 1;
776		nfsargsp->flags &= ~NFSMNT_NFSV3;
777	}
778	nfhret.stat = EACCES;	/* Mark not yet successful */
779	while (retrycnt > 0) {
780		saddr.sin_family = AF_INET;
781		saddr.sin_port = htons(PMAPPORT);
782		if ((tport = port_no ? port_no :
783		     pmap_getport(&saddr, RPCPROG_NFS,
784		    		  nfsvers, nfsproto)) == 0) {
785			if ((opflags & ISBGRND) == 0)
786				clnt_pcreateerror("NFS Portmap");
787		} else {
788			/*
789			 * First ping the nfs server to see if it supports
790			 * the version of the protocol we want to use.
791			 */
792			clnt_stat = pingnfsserver(&saddr, nfsvers,
793						  nfsargsp->sotype);
794			if (clnt_stat == RPC_PROGVERSMISMATCH) {
795				if (mountmode == ANY) {
796					mountmode = V2;
797					goto tryagain;
798				} else {
799					errx(1, "can't contact NFS server");
800				}
801			}
802			saddr.sin_port = 0;
803			pertry.tv_sec = 10;
804			pertry.tv_usec = 0;
805			if (mnttcp_ok && nfsargsp->sotype == SOCK_STREAM)
806			    clp = clnttcp_create(&saddr, RPCPROG_MNT, mntvers,
807				&so, 0, 0);
808			else
809			    clp = clntudp_create(&saddr, RPCPROG_MNT, mntvers,
810				pertry, &so);
811			if (clp == NULL) {
812				if ((opflags & ISBGRND) == 0)
813					clnt_pcreateerror("Cannot MNT RPC");
814			} else {
815				clp->cl_auth = authunix_create_default();
816				try.tv_sec = 10;
817				try.tv_usec = 0;
818				if (nfsargsp->flags & NFSMNT_KERB)
819				    nfhret.auth = RPCAUTH_KERB4;
820				else
821				    nfhret.auth = RPCAUTH_UNIX;
822				nfhret.vers = mntvers;
823				clnt_stat = clnt_call(clp, RPCMNT_MOUNT,
824				    xdr_dir, spec, xdr_fh, &nfhret, try);
825				if (clnt_stat != RPC_SUCCESS) {
826					if (clnt_stat == RPC_PROGVERSMISMATCH) {
827						if (mountmode == ANY) {
828							mountmode = V2;
829							goto tryagain;
830						} else {
831							errx(1, "%s",
832							     clnt_sperror(clp, "MNT RPC"));
833						}
834					}
835					if ((opflags & ISBGRND) == 0)
836						warnx("%s", clnt_sperror(clp,
837						    "bad MNT RPC"));
838				} else {
839					auth_destroy(clp->cl_auth);
840					clnt_destroy(clp);
841					retrycnt = 0;
842				}
843			}
844		}
845		if (--retrycnt > 0) {
846			if (opflags & BGRND) {
847				warnx("Cannot immediately mount %s:%s, backgrounding", hostp, spec);
848				opflags &= ~BGRND;
849				if ((i = fork())) {
850					if (i == -1)
851						err(1, "nqnfs 2");
852					exit(0);
853				}
854				(void) setsid();
855				(void) close(STDIN_FILENO);
856				(void) close(STDOUT_FILENO);
857				(void) close(STDERR_FILENO);
858				(void) chdir("/");
859				opflags |= ISBGRND;
860			}
861			sleep(60);
862		}
863	}
864	if (nfhret.stat) {
865		if (opflags & ISBGRND)
866			exit(1);
867		warnx("can't access %s: %s", spec, strerror(nfhret.stat));
868		return (0);
869	}
870	saddr.sin_port = htons(tport);
871#ifdef ISO
872	if (isoflag) {
873		nfsargsp->addr = (struct sockaddr *) &isoaddr;
874		nfsargsp->addrlen = sizeof (isoaddr);
875	} else
876#endif /* ISO */
877	{
878		nfsargsp->addr = (struct sockaddr *) &saddr;
879		nfsargsp->addrlen = sizeof (saddr);
880	}
881	nfsargsp->fh = nfhret.nfh;
882	nfsargsp->fhsize = nfhret.fhsize;
883	nfsargsp->hostname = nam;
884	return (1);
885}
886
887/*
888 * xdr routines for mount rpc's
889 */
890int
891xdr_dir(xdrsp, dirp)
892	XDR *xdrsp;
893	char *dirp;
894{
895	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
896}
897
898int
899xdr_fh(xdrsp, np)
900	XDR *xdrsp;
901	register struct nfhret *np;
902{
903	register int i;
904	long auth, authcnt, authfnd = 0;
905
906	if (!xdr_u_long(xdrsp, &np->stat))
907		return (0);
908	if (np->stat)
909		return (1);
910	switch (np->vers) {
911	case 1:
912		np->fhsize = NFSX_V2FH;
913		return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
914	case 3:
915		if (!xdr_long(xdrsp, &np->fhsize))
916			return (0);
917		if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
918			return (0);
919		if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
920			return (0);
921		if (!xdr_long(xdrsp, &authcnt))
922			return (0);
923		for (i = 0; i < authcnt; i++) {
924			if (!xdr_long(xdrsp, &auth))
925				return (0);
926			if (auth == np->auth)
927				authfnd++;
928		}
929		/*
930		 * Some servers, such as DEC's OSF/1 return a nil authenticator
931		 * list to indicate RPCAUTH_UNIX.
932		 */
933		if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
934			np->stat = EAUTH;
935		return (1);
936	};
937	return (0);
938}
939
940void
941usage()
942{
943	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
944"usage: mount_nfs [-23KNPTUbcdilqs] [-D deadthresh] [-I readdirsize]",
945"                 [-L leaseterm] [-R retrycnt] [-a maxreadahead]",
946"                 [-g maxgroups] [-m realm] [-o options] [-r readsize]",
947"                 [-t timeout] [-w writesize] [-x retrans] rhost:path node");
948	exit(1);
949}
950