mount_nfs.c revision 80086 
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 80086 2001-07-21 15:38:37Z iedowse $";
49#endif /* not lint */
50
51#include <sys/param.h>
52#include <sys/mount.h>
53#include <sys/socket.h>
54#include <sys/stat.h>
55#include <sys/syslog.h>
56
57#include <rpc/rpc.h>
58#include <rpc/pmap_clnt.h>
59#include <rpc/pmap_prot.h>
60
61#ifdef NFSKERB
62#include <kerberosIV/des.h>
63#include <kerberosIV/krb.h>
64#endif
65
66#include <nfs/rpcv2.h>
67#include <nfs/nfsproto.h>
68#include <nfs/nfs.h>
69#include <nfs/nqnfs.h>
70
71#include <arpa/inet.h>
72
73#include <ctype.h>
74#include <err.h>
75#include <errno.h>
76#include <fcntl.h>
77#include <netdb.h>
78#include <stdio.h>
79#include <stdlib.h>
80#include <strings.h>
81#include <sysexits.h>
82#include <unistd.h>
83
84#include "mntopts.h"
85#include "mounttab.h"
86
87#define	ALTF_BG		0x1
88#define ALTF_NOCONN	0x2
89#define ALTF_DUMBTIMR	0x4
90#define ALTF_INTR	0x8
91#define ALTF_KERB	0x10
92#define ALTF_NFSV3	0x20
93#define ALTF_RDIRPLUS	0x40
94#define	ALTF_MNTUDP	0x80
95#define ALTF_RESVPORT	0x100
96#define ALTF_SEQPACKET	0x200
97#define ALTF_NQNFS	0x400
98#define ALTF_SOFT	0x800
99#define ALTF_TCP	0x1000
100#define ALTF_PORT	0x2000
101#define ALTF_NFSV2	0x4000
102#define ALTF_ACREGMIN	0x8000
103#define ALTF_ACREGMAX	0x10000
104#define ALTF_ACDIRMIN	0x20000
105#define ALTF_ACDIRMAX	0x40000
106
107struct mntopt mopts[] = {
108	MOPT_STDOPTS,
109	MOPT_FORCE,
110	MOPT_UPDATE,
111	MOPT_ASYNC,
112	{ "bg", 0, ALTF_BG, 1 },
113	{ "conn", 1, ALTF_NOCONN, 1 },
114	{ "dumbtimer", 0, ALTF_DUMBTIMR, 1 },
115	{ "intr", 0, ALTF_INTR, 1 },
116#ifdef NFSKERB
117	{ "kerb", 0, ALTF_KERB, 1 },
118#endif
119	{ "nfsv3", 0, ALTF_NFSV3, 1 },
120	{ "rdirplus", 0, ALTF_RDIRPLUS, 1 },
121	{ "mntudp", 0, ALTF_MNTUDP, 1 },
122	{ "resvport", 0, ALTF_RESVPORT, 1 },
123	{ "nqnfs", 0, ALTF_NQNFS, 1 },
124	{ "soft", 0, ALTF_SOFT, 1 },
125	{ "tcp", 0, ALTF_TCP, 1 },
126	{ "port=", 0, ALTF_PORT, 1 },
127	{ "nfsv2", 0, ALTF_NFSV2, 1 },
128	{ "acregmin=", 0, ALTF_ACREGMIN, 1 },
129	{ "acregmax=", 0, ALTF_ACREGMAX, 1 },
130	{ "acdirmin=", 0, ALTF_ACDIRMIN, 1 },
131	{ "acdirmax=", 0, ALTF_ACDIRMAX, 1 },
132	{ NULL }
133};
134
135struct nfs_args nfsdefargs = {
136	NFS_ARGSVERSION,
137	(struct sockaddr *)0,
138	sizeof (struct sockaddr_in),
139	SOCK_DGRAM,
140	0,
141	(u_char *)0,
142	0,
143	NFSMNT_RESVPORT,
144	NFS_WSIZE,
145	NFS_RSIZE,
146	NFS_READDIRSIZE,
147	10,
148	NFS_RETRANS,
149	NFS_MAXGRPS,
150	NFS_DEFRAHEAD,
151	NQ_DEFLEASE,
152	NQ_DEADTHRESH,
153	(char *)0,
154	/* args version 4 */
155	NFS_MINATTRTIMO,
156	NFS_MAXATTRTIMO,
157	NFS_MINDIRATTRTIMO,
158	NFS_MAXDIRATTRTIMO,
159};
160
161/* Table for af,sotype -> netid conversions. */
162struct nc_protos {
163	char *netid;
164	int af;
165	int sotype;
166} nc_protos[] = {
167	{"udp",		AF_INET,	SOCK_DGRAM},
168	{"tcp",		AF_INET,	SOCK_STREAM},
169	{"udp6",	AF_INET6,	SOCK_DGRAM},
170	{"tcp6",	AF_INET6,	SOCK_STREAM},
171	{NULL}
172};
173
174struct nfhret {
175	u_long		stat;
176	long		vers;
177	long		auth;
178	long		fhsize;
179	u_char		nfh[NFSX_V3FHMAX];
180};
181#define	BGRND	1
182#define	ISBGRND	2
183int retrycnt = -1;
184int opflags = 0;
185int nfsproto = IPPROTO_UDP;
186int mnttcp_ok = 1;
187char *portspec = NULL;	/* Server nfs port; NULL means look up via rpcbind. */
188enum mountmode {
189	ANY,
190	V2,
191	V3
192} mountmode = ANY;
193
194#ifdef NFSKERB
195char inst[INST_SZ];
196char realm[REALM_SZ];
197struct {
198	u_long		kind;
199	KTEXT_ST	kt;
200} ktick;
201struct nfsrpc_nickverf kverf;
202struct nfsrpc_fullblock kin, kout;
203NFSKERBKEY_T kivec;
204CREDENTIALS kcr;
205struct timeval ktv;
206NFSKERBKEYSCHED_T kerb_keysched;
207#endif
208
209/* Return codes for nfs_tryproto. */
210enum tryret {
211	TRYRET_SUCCESS,
212	TRYRET_TIMEOUT,		/* No response received. */
213	TRYRET_REMOTEERR,	/* Error received from remote server. */
214	TRYRET_LOCALERR		/* Local failure. */
215};
216
217int	getnfsargs __P((char *, struct nfs_args *));
218/* void	set_rpc_maxgrouplist __P((int)); */
219struct netconfig *getnetconf_cached(const char *netid);
220char	*netidbytype(int af, int sotype);
221void	usage __P((void)) __dead2;
222int	xdr_dir __P((XDR *, char *));
223int	xdr_fh __P((XDR *, struct nfhret *));
224enum tryret nfs_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai,
225    char *hostp, char *spec, char **errstr);
226enum tryret returncode(enum clnt_stat stat, struct rpc_err *rpcerr);
227
228/*
229 * Used to set mount flags with getmntopts.  Call with dir=TRUE to
230 * initialize altflags from the current mount flags.  Call with
231 * dir=FALSE to update mount flags with the new value of altflags after
232 * the call to getmntopts.
233 */
234static void
235set_flags(int* altflags, int* nfsflags, int dir)
236{
237#define F2(af, nf)					\
238	if (dir) {					\
239		if (*nfsflags & NFSMNT_##nf)		\
240			*altflags |= ALTF_##af;		\
241		else					\
242			*altflags &= ~ALTF_##af;	\
243	} else {					\
244		if (*altflags & ALTF_##af)		\
245			*nfsflags |= NFSMNT_##nf;	\
246		else					\
247			*nfsflags &= ~NFSMNT_##nf;	\
248	}
249#define F(f)	F2(f,f)
250
251	F(NOCONN);
252	F(DUMBTIMR);
253	F2(INTR, INT);
254#ifdef NFSKERB
255	F(KERB);
256#endif
257	F(RDIRPLUS);
258	F(RESVPORT);
259	F(NQNFS);
260	F(SOFT);
261
262#undef F
263#undef F2
264}
265
266int
267main(argc, argv)
268	int argc;
269	char *argv[];
270{
271	register int c;
272	register struct nfs_args *nfsargsp;
273	struct nfs_args nfsargs;
274	struct nfsd_cargs ncd;
275	int mntflags, altflags, nfssvc_flag, num;
276	char *name, *p, *spec;
277	char mntpath[MAXPATHLEN];
278	struct vfsconf vfc;
279	int error = 0;
280#ifdef NFSKERB
281	uid_t last_ruid;
282
283	last_ruid = -1;
284	(void)strcpy(realm, KRB_REALM);
285	if (sizeof (struct nfsrpc_nickverf) != RPCX_NICKVERF ||
286	    sizeof (struct nfsrpc_fullblock) != RPCX_FULLBLOCK ||
287	    ((char *)&ktick.kt) - ((char *)&ktick) != NFSX_UNSIGNED ||
288	    ((char *)ktick.kt.dat) - ((char *)&ktick) != 2 * NFSX_UNSIGNED)
289		fprintf(stderr, "Yikes! NFSKERB structs not packed!!\n");
290#endif /* NFSKERB */
291
292	mntflags = 0;
293	altflags = 0;
294	nfsargs = nfsdefargs;
295	nfsargsp = &nfsargs;
296	while ((c = getopt(argc, argv,
297	    "23a:bcdD:g:I:iKL:lm:No:PpqR:r:sTt:w:x:U")) != -1)
298		switch (c) {
299		case '2':
300			mountmode = V2;
301			break;
302		case '3':
303			mountmode = V3;
304			break;
305		case 'a':
306			num = strtol(optarg, &p, 10);
307			if (*p || num < 0)
308				errx(1, "illegal -a value -- %s", optarg);
309			nfsargsp->readahead = num;
310			nfsargsp->flags |= NFSMNT_READAHEAD;
311			break;
312		case 'b':
313			opflags |= BGRND;
314			break;
315		case 'c':
316			nfsargsp->flags |= NFSMNT_NOCONN;
317			break;
318		case 'D':
319			num = strtol(optarg, &p, 10);
320			if (*p || num <= 0)
321				errx(1, "illegal -D value -- %s", optarg);
322			nfsargsp->deadthresh = num;
323			nfsargsp->flags |= NFSMNT_DEADTHRESH;
324			break;
325		case 'd':
326			nfsargsp->flags |= NFSMNT_DUMBTIMR;
327			break;
328#if 0 /* XXXX */
329		case 'g':
330			num = strtol(optarg, &p, 10);
331			if (*p || num <= 0)
332				errx(1, "illegal -g value -- %s", optarg);
333			set_rpc_maxgrouplist(num);
334			nfsargsp->maxgrouplist = num;
335			nfsargsp->flags |= NFSMNT_MAXGRPS;
336			break;
337#endif
338		case 'I':
339			num = strtol(optarg, &p, 10);
340			if (*p || num <= 0)
341				errx(1, "illegal -I value -- %s", optarg);
342			nfsargsp->readdirsize = num;
343			nfsargsp->flags |= NFSMNT_READDIRSIZE;
344			break;
345		case 'i':
346			nfsargsp->flags |= NFSMNT_INT;
347			break;
348#ifdef NFSKERB
349		case 'K':
350			nfsargsp->flags |= NFSMNT_KERB;
351			break;
352#endif
353		case 'L':
354			num = strtol(optarg, &p, 10);
355			if (*p || num < 2)
356				errx(1, "illegal -L value -- %s", optarg);
357			nfsargsp->leaseterm = num;
358			nfsargsp->flags |= NFSMNT_LEASETERM;
359			break;
360		case 'l':
361			nfsargsp->flags |= NFSMNT_RDIRPLUS;
362			break;
363#ifdef NFSKERB
364		case 'm':
365			(void)strncpy(realm, optarg, REALM_SZ - 1);
366			realm[REALM_SZ - 1] = '\0';
367			break;
368#endif
369		case 'N':
370			nfsargsp->flags &= ~NFSMNT_RESVPORT;
371			break;
372		case 'o':
373			altflags = 0;
374			set_flags(&altflags, &nfsargsp->flags, TRUE);
375			if (mountmode == V2)
376				altflags |= ALTF_NFSV2;
377			else if (mountmode == V3)
378				altflags |= ALTF_NFSV3;
379			getmntopts(optarg, mopts, &mntflags, &altflags);
380			set_flags(&altflags, &nfsargsp->flags, FALSE);
381			/*
382			 * Handle altflags which don't map directly to
383			 * mount flags.
384			 */
385			if(altflags & ALTF_BG)
386				opflags |= BGRND;
387			if(altflags & ALTF_MNTUDP)
388				mnttcp_ok = 0;
389			if(altflags & ALTF_TCP) {
390				nfsargsp->sotype = SOCK_STREAM;
391				nfsproto = IPPROTO_TCP;
392			}
393			if(altflags & ALTF_PORT) {
394				/*
395				 * XXX Converting from a string to an int
396				 * and back again is silly, and we should
397				 * allow /etc/services names.
398				 */
399				asprintf(&portspec, "%d",
400				    atoi(strstr(optarg, "port=") + 5));
401				if (portspec == NULL)
402					err(1, "asprintf");
403			}
404			mountmode = ANY;
405			if(altflags & ALTF_NFSV2)
406				mountmode = V2;
407			if(altflags & ALTF_NFSV3)
408				mountmode = V3;
409			if(altflags & ALTF_ACREGMIN)
410				nfsargsp->acregmin = atoi(strstr(optarg,
411				    "acregmin=") + 9);
412			if(altflags & ALTF_ACREGMAX)
413				nfsargsp->acregmax = atoi(strstr(optarg,
414				    "acregmax=") + 9);
415			if(altflags & ALTF_ACDIRMIN)
416				nfsargsp->acdirmin = atoi(strstr(optarg,
417				    "acdirmin=") + 9);
418			if(altflags & ALTF_ACDIRMAX)
419				nfsargsp->acdirmax = atoi(strstr(optarg,
420				    "acdirmax=") + 9);
421			break;
422		case 'P':
423			/* obsolete for NFSMNT_RESVPORT, now default */
424			break;
425		case 'q':
426			mountmode = V3;
427			nfsargsp->flags |= NFSMNT_NQNFS;
428			break;
429		case 'R':
430			num = strtol(optarg, &p, 10);
431			if (*p || num < 0)
432				errx(1, "illegal -R value -- %s", optarg);
433			retrycnt = num;
434			break;
435		case 'r':
436			num = strtol(optarg, &p, 10);
437			if (*p || num <= 0)
438				errx(1, "illegal -r value -- %s", optarg);
439			nfsargsp->rsize = num;
440			nfsargsp->flags |= NFSMNT_RSIZE;
441			break;
442		case 's':
443			nfsargsp->flags |= NFSMNT_SOFT;
444			break;
445		case 'T':
446			nfsargsp->sotype = SOCK_STREAM;
447			nfsproto = IPPROTO_TCP;
448			break;
449		case 't':
450			num = strtol(optarg, &p, 10);
451			if (*p || num <= 0)
452				errx(1, "illegal -t value -- %s", optarg);
453			nfsargsp->timeo = num;
454			nfsargsp->flags |= NFSMNT_TIMEO;
455			break;
456		case 'w':
457			num = strtol(optarg, &p, 10);
458			if (*p || num <= 0)
459				errx(1, "illegal -w value -- %s", optarg);
460			nfsargsp->wsize = num;
461			nfsargsp->flags |= NFSMNT_WSIZE;
462			break;
463		case 'x':
464			num = strtol(optarg, &p, 10);
465			if (*p || num <= 0)
466				errx(1, "illegal -x value -- %s", optarg);
467			nfsargsp->retrans = num;
468			nfsargsp->flags |= NFSMNT_RETRANS;
469			break;
470		case 'U':
471			mnttcp_ok = 0;
472			break;
473		default:
474			usage();
475			break;
476		}
477	argc -= optind;
478	argv += optind;
479
480	if (argc != 2) {
481		usage();
482		/* NOTREACHED */
483	}
484
485	spec = *argv++;
486	name = *argv;
487
488	if (retrycnt == -1)
489		/* The default is to keep retrying forever. */
490		retrycnt = 0;
491	if (!getnfsargs(spec, nfsargsp))
492		exit(1);
493
494	/* resolve the mountpoint with realpath(3) */
495	(void)checkpath(name, mntpath);
496
497	error = getvfsbyname("nfs", &vfc);
498	if (error && vfsisloadable("nfs")) {
499		if(vfsload("nfs"))
500			err(EX_OSERR, "vfsload(nfs)");
501		endvfsent();	/* clear cache */
502		error = getvfsbyname("nfs", &vfc);
503	}
504	if (error)
505		errx(EX_OSERR, "nfs filesystem is not available");
506
507	if (mount(vfc.vfc_name, mntpath, mntflags, nfsargsp))
508		err(1, "%s", mntpath);
509	if (nfsargsp->flags & (NFSMNT_NQNFS | NFSMNT_KERB)) {
510		if ((opflags & ISBGRND) == 0) {
511			if (daemon(0, 0) != 0)
512				err(1, "daemon");
513		}
514		openlog("mount_nfs", LOG_PID, LOG_DAEMON);
515		nfssvc_flag = NFSSVC_MNTD;
516		ncd.ncd_dirp = mntpath;
517		while (nfssvc(nfssvc_flag, (caddr_t)&ncd) < 0) {
518			if (errno != ENEEDAUTH) {
519				syslog(LOG_ERR, "nfssvc err %m");
520				continue;
521			}
522			nfssvc_flag =
523			    NFSSVC_MNTD | NFSSVC_GOTAUTH | NFSSVC_AUTHINFAIL;
524#ifdef NFSKERB
525			/*
526			 * Set up as ncd_authuid for the kerberos call.
527			 * Must set ruid to ncd_authuid and reset the
528			 * ticket name iff ncd_authuid is not the same
529			 * as last time, so that the right ticket file
530			 * is found.
531			 * Get the Kerberos credential structure so that
532			 * we have the session key and get a ticket for
533			 * this uid.
534			 * For more info see the IETF Draft "Authentication
535			 * in ONC RPC".
536			 */
537			if (ncd.ncd_authuid != last_ruid) {
538				char buf[512];
539				(void)sprintf(buf, "%s%d",
540					      TKT_ROOT, ncd.ncd_authuid);
541				krb_set_tkt_string(buf);
542				last_ruid = ncd.ncd_authuid;
543			}
544			setreuid(ncd.ncd_authuid, 0);
545			kret = krb_get_cred(NFS_KERBSRV, inst, realm, &kcr);
546			if (kret == RET_NOTKT) {
547		            kret = get_ad_tkt(NFS_KERBSRV, inst, realm,
548				DEFAULT_TKT_LIFE);
549			    if (kret == KSUCCESS)
550				kret = krb_get_cred(NFS_KERBSRV, inst, realm,
551				    &kcr);
552			}
553			if (kret == KSUCCESS)
554			    kret = krb_mk_req(&ktick.kt, NFS_KERBSRV, inst,
555				realm, 0);
556
557			/*
558			 * Fill in the AKN_FULLNAME authenticator and verifier.
559			 * Along with the Kerberos ticket, we need to build
560			 * the timestamp verifier and encrypt it in CBC mode.
561			 */
562			if (kret == KSUCCESS &&
563			    ktick.kt.length <= (RPCAUTH_MAXSIZ-3*NFSX_UNSIGNED)
564			    && gettimeofday(&ktv, (struct timezone *)0) == 0) {
565			    ncd.ncd_authtype = RPCAUTH_KERB4;
566			    ncd.ncd_authstr = (u_char *)&ktick;
567			    ncd.ncd_authlen = nfsm_rndup(ktick.kt.length) +
568				3 * NFSX_UNSIGNED;
569			    ncd.ncd_verfstr = (u_char *)&kverf;
570			    ncd.ncd_verflen = sizeof (kverf);
571			    memmove(ncd.ncd_key, kcr.session,
572				sizeof (kcr.session));
573			    kin.t1 = htonl(ktv.tv_sec);
574			    kin.t2 = htonl(ktv.tv_usec);
575			    kin.w1 = htonl(NFS_KERBTTL);
576			    kin.w2 = htonl(NFS_KERBTTL - 1);
577			    bzero((caddr_t)kivec, sizeof (kivec));
578
579			    /*
580			     * Encrypt kin in CBC mode using the session
581			     * key in kcr.
582			     */
583			    XXX
584
585			    /*
586			     * Finally, fill the timestamp verifier into the
587			     * authenticator and verifier.
588			     */
589			    ktick.kind = htonl(RPCAKN_FULLNAME);
590			    kverf.kind = htonl(RPCAKN_FULLNAME);
591			    NFS_KERBW1(ktick.kt) = kout.w1;
592			    ktick.kt.length = htonl(ktick.kt.length);
593			    kverf.verf.t1 = kout.t1;
594			    kverf.verf.t2 = kout.t2;
595			    kverf.verf.w2 = kout.w2;
596			    nfssvc_flag = NFSSVC_MNTD | NFSSVC_GOTAUTH;
597			}
598			setreuid(0, 0);
599#endif /* NFSKERB */
600		}
601	}
602	exit(0);
603}
604
605int
606getnfsargs(spec, nfsargsp)
607	char *spec;
608	struct nfs_args *nfsargsp;
609{
610	struct addrinfo hints, *ai_nfs, *ai;
611#ifdef NFSKERB
612	char host[NI_MAXHOST], serv[NI_MAXSERV];
613#endif
614	enum tryret ret;
615	int ecode, speclen, remoteerr;
616	char *hostp, *delimp, *errstr;
617#ifdef NFSKERB
618	char *cp;
619#endif
620	size_t len;
621	static char nam[MNAMELEN + 1];
622
623	if ((delimp = strrchr(spec, ':')) != NULL) {
624		hostp = spec;
625		spec = delimp + 1;
626	} else if ((delimp = strrchr(spec, '@')) != NULL) {
627		warnx("path@server syntax is deprecated, use server:path");
628		hostp = delimp + 1;
629	} else {
630		warnx("no <host>:<dirpath> nfs-name");
631		return (0);
632	}
633	*delimp = '\0';
634
635	/*
636	 * If there has been a trailing slash at mounttime it seems
637	 * that some mountd implementations fail to remove the mount
638	 * entries from their mountlist while unmounting.
639	 */
640	for (speclen = strlen(spec);
641		speclen > 1 && spec[speclen - 1] == '/';
642		speclen--)
643		spec[speclen - 1] = '\0';
644	if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
645		warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
646		return (0);
647	}
648	/* Make both '@' and ':' notations equal */
649	if (*hostp != '\0') {
650		len = strlen(hostp);
651		memmove(nam, hostp, len);
652		nam[len] = ':';
653		memmove(nam + len + 1, spec, speclen);
654		nam[len + speclen + 1] = '\0';
655	}
656
657	/*
658	 * Handle an internet host address and reverse resolve it if
659	 * doing Kerberos.
660	 */
661	memset(&hints, 0, sizeof hints);
662	hints.ai_flags = AI_NUMERICHOST;
663	hints.ai_socktype = nfsargsp->sotype;
664	if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) == 0) {
665#ifdef NFSKERB
666		if ((nfsargsp->flags & NFSMNT_KERB)) {
667			hints.ai_flags = 0;
668			if (getnameinfo(ai_nfs->ai_addr, ai_nfs->ai_addrlen,
669			    host, sizeof host, serv, sizeof serv, 0) != 0) {
670				warnx("can't reverse resolve net address");
671					return (0);
672				}
673			hostp = host;
674		}
675#endif /* NFSKERB */
676	} else {
677		hints.ai_flags = 0;
678		if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
679		    != 0) {
680			if (portspec == NULL)
681				errx(1, "%s: %s", hostp, gai_strerror(ecode));
682			else
683				errx(1, "%s:%s: %s", hostp, portspec,
684				    gai_strerror(ecode));
685			return (0);
686		}
687	}
688#ifdef NFSKERB
689	if (nfsargsp->flags & NFSMNT_KERB) {
690		strncpy(inst, hp->h_name, INST_SZ);
691		inst[INST_SZ - 1] = '\0';
692		if (cp = strchr(inst, '.'))
693			*cp = '\0';
694	}
695#endif /* NFSKERB */
696
697	ret = TRYRET_LOCALERR;
698	for (;;) {
699		/*
700		 * Try each entry returned by getaddrinfo(). Note the
701		 * occurence of remote errors by setting `remoteerr'.
702		 */
703		remoteerr = 0;
704		for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
705			ret = nfs_tryproto(nfsargsp, ai, hostp, spec, &errstr);
706			if (ret == TRYRET_SUCCESS)
707				break;
708			if (ret != TRYRET_LOCALERR)
709				remoteerr = 1;
710			if ((opflags & ISBGRND) == 0)
711				fprintf(stderr, "%s\n", errstr);
712		}
713		if (ret == TRYRET_SUCCESS)
714			break;
715
716		/* Exit if all errors were local. */
717		if (!remoteerr)
718			exit(1);
719
720		/*
721		 * If retrycnt == 0, we are to keep retrying forever.
722		 * Otherwise decrement it, and exit if it hits zero.
723		 */
724		if (retrycnt != 0 && --retrycnt == 0)
725			exit(1);
726
727		if ((opflags & (BGRND | ISBGRND)) == BGRND) {
728			warnx("Cannot immediately mount %s:%s, backgrounding",
729			    hostp, spec);
730			opflags |= ISBGRND;
731			if (daemon(0, 0) != 0)
732				err(1, "daemon");
733		}
734		sleep(60);
735	}
736	freeaddrinfo(ai_nfs);
737	nfsargsp->hostname = nam;
738	/* Add mounted filesystem to PATH_MOUNTTAB */
739	if (!add_mtab(hostp, spec))
740		warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
741	return (1);
742}
743
744/*
745 * Try to set up the NFS arguments according to the address
746 * family, protocol (and possibly port) specified in `ai'.
747 *
748 * Returns TRYRET_SUCCESS if successful, or:
749 *   TRYRET_TIMEOUT		The server did not respond.
750 *   TRYRET_REMOTEERR		The server reported an error.
751 *   TRYRET_LOCALERR		Local failure.
752 *
753 * In all error cases, *errstr will be set to a statically-allocated string
754 * describing the error.
755 */
756enum tryret
757nfs_tryproto(struct nfs_args *nfsargsp, struct addrinfo *ai, char *hostp,
758    char *spec, char **errstr)
759{
760	static char errbuf[256];
761	struct sockaddr_storage nfs_ss;
762	struct netbuf nfs_nb;
763	struct nfhret nfhret;
764	struct timeval try;
765	struct rpc_err rpcerr;
766	CLIENT *clp;
767	struct netconfig *nconf, *nconf_mnt;
768	char *netid, *netid_mnt;
769	int doconnect, nfsvers, mntvers;
770	enum clnt_stat stat;
771	enum mountmode trymntmode;
772
773	trymntmode = mountmode;
774	errbuf[0] = '\0';
775	*errstr = errbuf;
776
777	if ((netid = netidbytype(ai->ai_family, nfsargsp->sotype)) == NULL) {
778		snprintf(errbuf, sizeof errbuf,
779		    "af %d sotype %d not supported", ai->ai_family,
780		    nfsargsp->sotype);
781		return (TRYRET_LOCALERR);
782	}
783	if ((nconf = getnetconf_cached(netid)) == NULL) {
784		snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
785		return (TRYRET_LOCALERR);
786	}
787	/* The RPCPROG_MNT netid may be different. */
788	if (mnttcp_ok) {
789		netid_mnt = netid;
790		nconf_mnt = nconf;
791	} else {
792		if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
793		     == NULL) {
794			snprintf(errbuf, sizeof errbuf,
795			    "af %d sotype SOCK_DGRAM not supported",
796			     ai->ai_family);
797			return (TRYRET_LOCALERR);
798		}
799		if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
800			snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
801			    nc_sperror());
802			return (TRYRET_LOCALERR);
803		}
804	}
805
806tryagain:
807	if (trymntmode == V2) {
808		nfsvers = 2;
809		mntvers = 1;
810	} else {
811		nfsvers = 3;
812		mntvers = 3;
813	}
814
815	if (portspec != NULL) {
816		/* `ai' contains the complete nfsd sockaddr. */
817		nfs_nb.buf = ai->ai_addr;
818		nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
819	} else {
820		/* Ask the remote rpcbind. */
821		nfs_nb.buf = &nfs_ss;
822		nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
823
824		if (!rpcb_getaddr(RPCPROG_NFS, nfsvers, nconf, &nfs_nb,
825		    hostp)) {
826			if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
827			    trymntmode == ANY) {
828				trymntmode = V2;
829				goto tryagain;
830			}
831			snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
832			    netid, hostp, spec,
833			    clnt_spcreateerror("RPCPROG_NFS"));
834			return (returncode(rpc_createerr.cf_stat,
835			    &rpc_createerr.cf_error));
836		}
837	}
838
839	/* Check that the server (nfsd) responds on the port we have chosen. */
840	clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, RPCPROG_NFS, nfsvers,
841	    0, 0);
842	if (clp == NULL) {
843		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
844		    hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
845		return (returncode(rpc_createerr.cf_stat,
846		    &rpc_createerr.cf_error));
847	}
848	if (nfsargsp->sotype == SOCK_DGRAM) {
849		/*
850		 * Use connect(), to match what the kernel does. This
851		 * catches cases where the server responds from the
852		 * wrong source address.
853		 */
854		doconnect = 1;
855		if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
856			clnt_destroy(clp);
857			snprintf(errbuf, sizeof errbuf,
858			    "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
859			    spec);
860			return (TRYRET_LOCALERR);
861		}
862	}
863
864	try.tv_sec = 10;
865	try.tv_usec = 0;
866	stat = clnt_call(clp, NFSPROC_NULL, xdr_void, NULL, xdr_void, NULL,
867	    try);
868	if (stat != RPC_SUCCESS) {
869		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
870			clnt_destroy(clp);
871			trymntmode = V2;
872			goto tryagain;
873		}
874		clnt_geterr(clp, &rpcerr);
875		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
876		    hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
877		clnt_destroy(clp);
878		return (returncode(stat, &rpcerr));
879	}
880	clnt_destroy(clp);
881
882	/* Send the RPCMNT_MOUNT RPC to get the root filehandle. */
883	try.tv_sec = 10;
884	try.tv_usec = 0;
885	clp = clnt_tp_create(hostp, RPCPROG_MNT, mntvers, nconf_mnt);
886	if (clp == NULL) {
887		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
888		    hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
889		return (returncode(rpc_createerr.cf_stat,
890		    &rpc_createerr.cf_error));
891	}
892	clp->cl_auth = authsys_create_default();
893	if (nfsargsp->flags & NFSMNT_KERB)
894		nfhret.auth = RPCAUTH_KERB4;
895	else
896		nfhret.auth = RPCAUTH_UNIX;
897	nfhret.vers = mntvers;
898	stat = clnt_call(clp, RPCMNT_MOUNT, xdr_dir, spec, xdr_fh, &nfhret,
899	    try);
900	auth_destroy(clp->cl_auth);
901	if (stat != RPC_SUCCESS) {
902		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
903			clnt_destroy(clp);
904			trymntmode = V2;
905			goto tryagain;
906		}
907		clnt_geterr(clp, &rpcerr);
908		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
909		    hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
910		clnt_destroy(clp);
911		return (returncode(stat, &rpcerr));
912	}
913	clnt_destroy(clp);
914
915	if (nfhret.stat != 0) {
916		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
917		    hostp, spec, strerror(nfhret.stat));
918		return (TRYRET_REMOTEERR);
919	}
920
921	/*
922	 * Store the filehandle and server address in nfsargsp, making
923	 * sure to copy any locally allocated structures.
924	 */
925	nfsargsp->addrlen = nfs_nb.len;
926	nfsargsp->addr = malloc(nfsargsp->addrlen);
927	nfsargsp->fhsize = nfhret.fhsize;
928	nfsargsp->fh = malloc(nfsargsp->fhsize);
929	if (nfsargsp->addr == NULL || nfsargsp->fh == NULL)
930		err(1, "malloc");
931	bcopy(nfs_nb.buf, nfsargsp->addr, nfsargsp->addrlen);
932	bcopy(nfhret.nfh, nfsargsp->fh, nfsargsp->fhsize);
933
934	if (nfsvers == 3)
935		nfsargsp->flags |= NFSMNT_NFSV3;
936	else
937		nfsargsp->flags &= ~NFSMNT_NFSV3;
938
939	return (TRYRET_SUCCESS);
940}
941
942
943/*
944 * Catagorise a RPC return status and error into an `enum tryret'
945 * return code.
946 */
947enum tryret
948returncode(enum clnt_stat stat, struct rpc_err *rpcerr)
949{
950	switch (stat) {
951	case RPC_TIMEDOUT:
952		return (TRYRET_TIMEOUT);
953	case RPC_PMAPFAILURE:
954	case RPC_PROGNOTREGISTERED:
955	case RPC_PROGVERSMISMATCH:
956	/* XXX, these can be local or remote. */
957	case RPC_CANTSEND:
958	case RPC_CANTRECV:
959		return (TRYRET_REMOTEERR);
960	case RPC_SYSTEMERROR:
961		switch (rpcerr->re_errno) {
962		case ETIMEDOUT:
963			return (TRYRET_TIMEOUT);
964		case ENOMEM:
965			break;
966		default:
967			return (TRYRET_REMOTEERR);
968		}
969		/* FALLTHROUGH */
970	default:
971		break;
972	}
973	return (TRYRET_LOCALERR);
974}
975
976/*
977 * Look up a netid based on an address family and socket type.
978 * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
979 *
980 * XXX there should be a library function for this.
981 */
982char *
983netidbytype(int af, int sotype) {
984	struct nc_protos *p;
985
986	for (p = nc_protos; p->netid != NULL; p++) {
987		if (af != p->af || sotype != p->sotype)
988			continue;
989		return (p->netid);
990	}
991	return (NULL);
992}
993
994/*
995 * Look up a netconfig entry based on a netid, and cache the result so
996 * that we don't need to remember to call freenetconfigent().
997 *
998 * Otherwise it behaves just like getnetconfigent(), so nc_*error()
999 * work on failure.
1000 */
1001struct netconfig *
1002getnetconf_cached(const char *netid) {
1003	static struct nc_entry {
1004		struct netconfig *nconf;
1005		struct nc_entry *next;
1006	} *head;
1007	struct nc_entry *p;
1008	struct netconfig *nconf;
1009
1010	for (p = head; p != NULL; p = p->next)
1011		if (strcmp(netid, p->nconf->nc_netid) == 0)
1012			return (p->nconf);
1013
1014	if ((nconf = getnetconfigent(netid)) == NULL)
1015		return (NULL);
1016	if ((p = malloc(sizeof(*p))) == NULL)
1017		err(1, "malloc");
1018	p->nconf = nconf;
1019	p->next = head;
1020	head = p;
1021
1022	return (p->nconf);
1023}
1024
1025/*
1026 * xdr routines for mount rpc's
1027 */
1028int
1029xdr_dir(xdrsp, dirp)
1030	XDR *xdrsp;
1031	char *dirp;
1032{
1033	return (xdr_string(xdrsp, &dirp, RPCMNT_PATHLEN));
1034}
1035
1036int
1037xdr_fh(xdrsp, np)
1038	XDR *xdrsp;
1039	register struct nfhret *np;
1040{
1041	register int i;
1042	long auth, authcnt, authfnd = 0;
1043
1044	if (!xdr_u_long(xdrsp, &np->stat))
1045		return (0);
1046	if (np->stat)
1047		return (1);
1048	switch (np->vers) {
1049	case 1:
1050		np->fhsize = NFSX_V2FH;
1051		return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFSX_V2FH));
1052	case 3:
1053		if (!xdr_long(xdrsp, &np->fhsize))
1054			return (0);
1055		if (np->fhsize <= 0 || np->fhsize > NFSX_V3FHMAX)
1056			return (0);
1057		if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
1058			return (0);
1059		if (!xdr_long(xdrsp, &authcnt))
1060			return (0);
1061		for (i = 0; i < authcnt; i++) {
1062			if (!xdr_long(xdrsp, &auth))
1063				return (0);
1064			if (auth == np->auth)
1065				authfnd++;
1066		}
1067		/*
1068		 * Some servers, such as DEC's OSF/1 return a nil authenticator
1069		 * list to indicate RPCAUTH_UNIX.
1070		 */
1071		if (!authfnd && (authcnt > 0 || np->auth != RPCAUTH_UNIX))
1072			np->stat = EAUTH;
1073		return (1);
1074	};
1075	return (0);
1076}
1077
1078void
1079usage()
1080{
1081	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
1082"usage: mount_nfs [-23KNPTUbcdilqs] [-D deadthresh] [-I readdirsize]",
1083"                 [-L leaseterm] [-R retrycnt] [-a maxreadahead]",
1084"                 [-g maxgroups] [-m realm] [-o options] [-r readsize]",
1085"                 [-t timeout] [-w writesize] [-x retrans] rhost:path node");
1086	exit(1);
1087}
1088