mount_nfs.c revision 203490 
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 * 4. Neither the name of the University nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#if 0
34#ifndef lint
35static const char copyright[] =
36"@(#) Copyright (c) 1992, 1993, 1994\n\
37	The Regents of the University of California.  All rights reserved.\n";
38#endif /* not lint */
39
40#ifndef lint
41static char sccsid[] = "@(#)mount_nfs.c	8.11 (Berkeley) 5/4/95";
42#endif /* not lint */
43#endif
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD: head/sbin/mount_nfs/mount_nfs.c 203490 2010-02-04 15:17:49Z ume $");
46
47#include <sys/param.h>
48#include <sys/linker.h>
49#include <sys/module.h>
50#include <sys/mount.h>
51#include <sys/socket.h>
52#include <sys/stat.h>
53#include <sys/syslog.h>
54#include <sys/uio.h>
55
56#include <rpc/rpc.h>
57#include <rpc/pmap_clnt.h>
58#include <rpc/pmap_prot.h>
59#include <rpcsvc/nfs_prot.h>
60#include <rpcsvc/mount.h>
61
62#include <nfsclient/nfs.h>
63
64#include <arpa/inet.h>
65
66#include <ctype.h>
67#include <err.h>
68#include <errno.h>
69#include <fcntl.h>
70#include <netdb.h>
71#include <stdio.h>
72#include <stdlib.h>
73#include <string.h>
74#include <strings.h>
75#include <sysexits.h>
76#include <unistd.h>
77
78#include "mntopts.h"
79#include "mounttab.h"
80
81/* Table for af,sotype -> netid conversions. */
82struct nc_protos {
83	const char *netid;
84	int af;
85	int sotype;
86} nc_protos[] = {
87	{"udp",		AF_INET,	SOCK_DGRAM},
88	{"tcp",		AF_INET,	SOCK_STREAM},
89	{"udp6",	AF_INET6,	SOCK_DGRAM},
90	{"tcp6",	AF_INET6,	SOCK_STREAM},
91	{NULL,		0,		0}
92};
93
94struct nfhret {
95	u_long		stat;
96	long		vers;
97	long		auth;
98	long		fhsize;
99	u_char		nfh[NFS3_FHSIZE];
100};
101#define	BGRND	1
102#define	ISBGRND	2
103#define	OF_NOINET4	4
104#define	OF_NOINET6	8
105int retrycnt = -1;
106int opflags = 0;
107int nfsproto = IPPROTO_TCP;
108int mnttcp_ok = 1;
109int noconn = 0;
110char *portspec = NULL;	/* Server nfs port; NULL means look up via rpcbind. */
111struct sockaddr *addr;
112int addrlen = 0;
113u_char *fh = NULL;
114int fhsize = 0;
115int secflavor = -1;
116int got_principal = 0;
117
118enum mountmode {
119	ANY,
120	V2,
121	V3,
122	V4
123} mountmode = ANY;
124
125/* Return codes for nfs_tryproto. */
126enum tryret {
127	TRYRET_SUCCESS,
128	TRYRET_TIMEOUT,		/* No response received. */
129	TRYRET_REMOTEERR,	/* Error received from remote server. */
130	TRYRET_LOCALERR		/* Local failure. */
131};
132
133static int	fallback_mount(struct iovec *iov, int iovlen, int mntflags);
134static int	sec_name_to_num(char *sec);
135static char	*sec_num_to_name(int num);
136static int	getnfsargs(char *, struct iovec **iov, int *iovlen);
137/* void	set_rpc_maxgrouplist(int); */
138static struct netconfig *getnetconf_cached(const char *netid);
139static const char	*netidbytype(int af, int sotype);
140static void	usage(void) __dead2;
141static int	xdr_dir(XDR *, char *);
142static int	xdr_fh(XDR *, struct nfhret *);
143static enum tryret nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec,
144    char **errstr, struct iovec **iov, int *iovlen);
145static enum tryret returncode(enum clnt_stat stat, struct rpc_err *rpcerr);
146
147int
148main(int argc, char *argv[])
149{
150	int c;
151	struct iovec *iov;
152	int mntflags, num, iovlen;
153	int osversion;
154	char *name, *p, *spec, *fstype;
155	char mntpath[MAXPATHLEN], errmsg[255];
156	char hostname[MAXHOSTNAMELEN + 1], *gssname, gssn[MAXHOSTNAMELEN + 50];
157
158	mntflags = 0;
159	iov = NULL;
160	iovlen = 0;
161	memset(errmsg, 0, sizeof(errmsg));
162	gssname = NULL;
163
164	fstype = strrchr(argv[0], '_');
165	if (fstype == NULL)
166		errx(EX_USAGE, "argv[0] must end in _fstype");
167
168	++fstype;
169
170	while ((c = getopt(argc, argv,
171	    "23a:bcdD:g:I:iLlNo:PR:r:sTt:w:x:U")) != -1)
172		switch (c) {
173		case '2':
174			mountmode = V2;
175			break;
176		case '3':
177			mountmode = V3;
178			break;
179		case 'a':
180			printf("-a deprecated, use -o readhead=<value>\n");
181			build_iovec(&iov, &iovlen, "readahead", optarg, (size_t)-1);
182			break;
183		case 'b':
184			opflags |= BGRND;
185			break;
186		case 'c':
187			printf("-c deprecated, use -o noconn\n");
188			build_iovec(&iov, &iovlen, "noconn", NULL, 0);
189			noconn = 1;
190			break;
191		case 'D':
192			printf("-D deprecated, use -o deadthresh=<value>\n");
193			build_iovec(&iov, &iovlen, "deadthresh", optarg, (size_t)-1);
194			break;
195		case 'd':
196			printf("-d deprecated, use -o dumbtimer");
197			build_iovec(&iov, &iovlen, "dumbtimer", NULL, 0);
198			break;
199		case 'g':
200			printf("-g deprecated, use -o maxgroups");
201			num = strtol(optarg, &p, 10);
202			if (*p || num <= 0)
203				errx(1, "illegal -g value -- %s", optarg);
204			//set_rpc_maxgrouplist(num);
205			build_iovec(&iov, &iovlen, "maxgroups", optarg, (size_t)-1);
206			break;
207		case 'I':
208			printf("-I deprecated, use -o readdirsize=<value>\n");
209			build_iovec(&iov, &iovlen, "readdirsize", optarg, (size_t)-1);
210			break;
211		case 'i':
212			printf("-i deprecated, use -o intr\n");
213			build_iovec(&iov, &iovlen, "intr", NULL, 0);
214			break;
215		case 'L':
216			printf("-i deprecated, use -o nolockd\n");
217			build_iovec(&iov, &iovlen, "nolockd", NULL, 0);
218			break;
219		case 'l':
220			printf("-l deprecated, -o rdirplus\n");
221			build_iovec(&iov, &iovlen, "rdirplus", NULL, 0);
222			break;
223		case 'N':
224			printf("-N deprecated, do not specify -o resvport\n");
225			break;
226		case 'o': {
227			int pass_flag_to_nmount;
228			char *opt = optarg;
229			while (opt) {
230				char *pval = NULL;
231				char *pnextopt = NULL;
232				char *val = "";
233				pass_flag_to_nmount = 1;
234				pnextopt = strchr(opt, ',');
235				if (pnextopt != NULL) {
236					*pnextopt = '\0';
237					pnextopt++;
238				}
239				pval = strchr(opt, '=');
240				if (pval != NULL) {
241					*pval = '\0';
242					val = pval + 1;
243				}
244				if (strcmp(opt, "bg") == 0) {
245					opflags |= BGRND;
246					pass_flag_to_nmount=0;
247				} else if (strcmp(opt, "fg") == 0) {
248					/* same as not specifying -o bg */
249					pass_flag_to_nmount=0;
250				} else if (strcmp(opt, "gssname") == 0) {
251					pass_flag_to_nmount = 0;
252					gssname = val;
253				} else if (strcmp(opt, "mntudp") == 0) {
254					mnttcp_ok = 0;
255					nfsproto = IPPROTO_UDP;
256				} else if (strcmp(opt, "udp") == 0) {
257					nfsproto = IPPROTO_UDP;
258				} else if (strcmp(opt, "tcp") == 0) {
259					nfsproto = IPPROTO_TCP;
260				} else if (strcmp(opt, "noinet4") == 0) {
261					pass_flag_to_nmount=0;
262					opflags |= OF_NOINET4;
263				} else if (strcmp(opt, "noinet6") == 0) {
264					pass_flag_to_nmount=0;
265					opflags |= OF_NOINET6;
266				} else if (strcmp(opt, "noconn") == 0) {
267					noconn = 1;
268				} else if (strcmp(opt, "nfsv2") == 0) {
269					pass_flag_to_nmount=0;
270					mountmode = V2;
271				} else if (strcmp(opt, "nfsv3") == 0) {
272					mountmode = V3;
273				} else if (strcmp(opt, "nfsv4") == 0) {
274					pass_flag_to_nmount=0;
275					mountmode = V4;
276					fstype = "newnfs";
277					nfsproto = IPPROTO_TCP;
278					if (portspec == NULL)
279						portspec = "2049";
280				} else if (strcmp(opt, "port") == 0) {
281					pass_flag_to_nmount=0;
282					asprintf(&portspec, "%d",
283					    atoi(val));
284					if (portspec == NULL)
285						err(1, "asprintf");
286				} else if (strcmp(opt, "principal") == 0) {
287					got_principal = 1;
288				} else if (strcmp(opt, "sec") == 0) {
289					/*
290					 * Don't add this option to
291					 * the iovec yet - we will
292					 * negotiate which sec flavor
293					 * to use with the remote
294					 * mountd.
295					 */
296					pass_flag_to_nmount=0;
297					secflavor = sec_name_to_num(val);
298					if (secflavor < 0) {
299						errx(1,
300						    "illegal sec value -- %s",
301						    val);
302					}
303				} else if (strcmp(opt, "retrycnt") == 0) {
304					pass_flag_to_nmount=0;
305					num = strtol(val, &p, 10);
306					if (*p || num < 0)
307						errx(1, "illegal retrycnt value -- %s", val);
308					retrycnt = num;
309				} else if (strcmp(opt, "maxgroups") == 0) {
310					num = strtol(val, &p, 10);
311					if (*p || num <= 0)
312						errx(1, "illegal maxgroups value -- %s", val);
313					//set_rpc_maxgrouplist(num);
314				}
315				if (pass_flag_to_nmount)
316					build_iovec(&iov, &iovlen, opt, val,
317					    strlen(val) + 1);
318				opt = pnextopt;
319			}
320			}
321			break;
322		case 'P':
323			/* obsolete for -o noresvport now default */
324			printf("-P deprecated, use -o noresvport\n");
325			build_iovec(&iov, &iovlen, "noresvport", NULL, 0);
326			break;
327		case 'R':
328			printf("-R deprecated, use -o retrycnt=<retrycnt>\n");
329			num = strtol(optarg, &p, 10);
330			if (*p || num < 0)
331				errx(1, "illegal -R value -- %s", optarg);
332			retrycnt = num;
333			break;
334		case 'r':
335			printf("-r deprecated, use -o rsize=<rsize>\n");
336			build_iovec(&iov, &iovlen, "rsize", optarg, (size_t)-1);
337			break;
338		case 's':
339			printf("-s deprecated, use -o soft\n");
340			build_iovec(&iov, &iovlen, "soft", NULL, 0);
341			break;
342		case 'T':
343			nfsproto = IPPROTO_TCP;
344			printf("-T deprecated, use -o tcp\n");
345			break;
346		case 't':
347			printf("-t deprecated, use -o timeout=<value>\n");
348			build_iovec(&iov, &iovlen, "timeout", optarg, (size_t)-1);
349			break;
350		case 'w':
351			printf("-w deprecated, use -o wsize=<value>\n");
352			build_iovec(&iov, &iovlen, "wsize", optarg, (size_t)-1);
353			break;
354		case 'x':
355			printf("-x deprecated, use -o retrans=<value>\n");
356			build_iovec(&iov, &iovlen, "retrans", optarg, (size_t)-1);
357			break;
358		case 'U':
359			printf("-U deprecated, use -o mntudp\n");
360			mnttcp_ok = 0;
361			nfsproto = IPPROTO_UDP;
362			build_iovec(&iov, &iovlen, "mntudp", NULL, 0);
363			break;
364		default:
365			usage();
366			break;
367		}
368	argc -= optind;
369	argv += optind;
370
371	if (argc != 2) {
372		usage();
373		/* NOTREACHED */
374	}
375
376	spec = *argv++;
377	name = *argv;
378
379	if (retrycnt == -1)
380		/* The default is to keep retrying forever. */
381		retrycnt = 0;
382
383	/*
384	 * If the experimental nfs subsystem is loaded into the kernel
385	 * and the regular one is not, use it. Otherwise, use it if the
386	 * fstype is set to "newnfs", either via "mount -t newnfs ..."
387	 * or by specifying an nfsv4 mount.
388	 */
389	if (modfind("nfscl") >= 0 && modfind("nfs") < 0) {
390		fstype = "newnfs";
391	} else if (strcmp(fstype, "newnfs") == 0) {
392		if (modfind("nfscl") < 0) {
393			/* Not present in kernel, try loading it */
394			if (kldload("nfscl") < 0 ||
395			    modfind("nfscl") < 0)
396				errx(1, "nfscl is not available");
397		}
398	}
399
400	/*
401	 * Add the fqdn to the gssname, as required.
402	 */
403	if (gssname != NULL) {
404		if (strchr(gssname, '@') == NULL &&
405		    gethostname(hostname, MAXHOSTNAMELEN) == 0) {
406			snprintf(gssn, sizeof (gssn), "%s@%s", gssname,
407			    hostname);
408			gssname = gssn;
409		}
410		build_iovec(&iov, &iovlen, "gssname", gssname,
411		    strlen(gssname) + 1);
412	}
413
414	if (!getnfsargs(spec, &iov, &iovlen))
415		exit(1);
416
417	/* resolve the mountpoint with realpath(3) */
418	(void)checkpath(name, mntpath);
419
420	build_iovec(&iov, &iovlen, "fstype", fstype, (size_t)-1);
421	build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
422	build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
423
424	/*
425	 * XXX:
426	 * Backwards compatibility routines for older kernels.
427	 * Remove this and fallback_mount() code when we do not need to support
428	 * NFS mounts against older kernels which still need
429	 * struct nfs_args to be passed in via nmount().
430	 */
431	osversion = getosreldate();
432	if (osversion >= 702100) {
433		if (nmount(iov, iovlen, mntflags))
434			err(1, "%s, %s", mntpath, errmsg);
435	} else {
436		if (fallback_mount(iov, iovlen, mntflags))
437			err(1, "%s, %s", mntpath, errmsg);
438	}
439
440	exit(0);
441}
442
443static int
444findopt(struct iovec *iov, int iovlen, const char *name,
445    char **valuep, int *lenp)
446{
447	int i;
448
449	for (i = 0; i < iovlen/2; i++, iov += 2) {
450		if (strcmp(name, iov[0].iov_base) == 0) {
451			if (valuep)
452				*valuep = iov[1].iov_base;
453			if (lenp)
454				*lenp = iov[1].iov_len;
455			return (0);
456		}
457	}
458	return (ENOENT);
459}
460
461static void
462copyopt(struct iovec **newiov, int *newiovlen,
463    struct iovec *iov, int iovlen, const char *name)
464{
465	char *value;
466	int len;
467
468	if (findopt(iov, iovlen, name, &value, &len) == 0)
469		build_iovec(newiov, newiovlen, name, value, len);
470}
471
472/*
473 * XXX: This function is provided for backwards
474 *      compatibility with older kernels which did not support
475 *      passing NFS mount options to nmount() as individual
476 *      parameters.  It should be eventually be removed.
477 */
478static int
479fallback_mount(struct iovec *iov, int iovlen, int mntflags)
480{
481	struct nfs_args args = {
482	    .version = NFS_ARGSVERSION,
483	    .addr = NULL,
484	    .addrlen = sizeof (struct sockaddr_in),
485	    .sotype = SOCK_STREAM,
486	    .proto = 0,
487	    .fh = NULL,
488	    .fhsize = 0,
489	    .flags = NFSMNT_RESVPORT,
490	    .wsize = NFS_WSIZE,
491	    .rsize = NFS_RSIZE,
492	    .readdirsize = NFS_READDIRSIZE,
493	    .timeo = 10,
494	    .retrans = NFS_RETRANS,
495	    .maxgrouplist = NFS_MAXGRPS,
496	    .readahead = NFS_DEFRAHEAD,
497	    .wcommitsize = 0,			/* was: NQ_DEFLEASE */
498	    .deadthresh = NFS_MAXDEADTHRESH,	/* was: NQ_DEADTHRESH */
499	    .hostname = NULL,
500	    /* args version 4 */
501	    .acregmin = NFS_MINATTRTIMO,
502	    .acregmax = NFS_MAXATTRTIMO,
503	    .acdirmin = NFS_MINDIRATTRTIMO,
504	    .acdirmax = NFS_MAXDIRATTRTIMO,
505	};
506	int ret;
507	char *opt;
508	struct iovec *newiov;
509	int newiovlen;
510
511	if (findopt(iov, iovlen, "dumbtimer", NULL, NULL) == 0)
512		args.flags |= NFSMNT_DUMBTIMR;
513	if (findopt(iov, iovlen, "noconn", NULL, NULL) == 0)
514		args.flags |= NFSMNT_NOCONN;
515	if (findopt(iov, iovlen, "conn", NULL, NULL) == 0)
516		args.flags |= NFSMNT_NOCONN;
517	if (findopt(iov, iovlen, "nolockd", NULL, NULL) == 0)
518		args.flags |= NFSMNT_NOLOCKD;
519	if (findopt(iov, iovlen, "lockd", NULL, NULL) == 0)
520		args.flags &= ~NFSMNT_NOLOCKD;
521	if (findopt(iov, iovlen, "intr", NULL, NULL) == 0)
522		args.flags |= NFSMNT_INT;
523	if (findopt(iov, iovlen, "rdirplus", NULL, NULL) == 0)
524		args.flags |= NFSMNT_RDIRPLUS;
525	if (findopt(iov, iovlen, "resvport", NULL, NULL) == 0)
526		args.flags |= NFSMNT_RESVPORT;
527	if (findopt(iov, iovlen, "noresvport", NULL, NULL) == 0)
528		args.flags &= ~NFSMNT_RESVPORT;
529	if (findopt(iov, iovlen, "soft", NULL, NULL) == 0)
530		args.flags |= NFSMNT_SOFT;
531	if (findopt(iov, iovlen, "hard", NULL, NULL) == 0)
532		args.flags &= ~NFSMNT_SOFT;
533	if (findopt(iov, iovlen, "mntudp", NULL, NULL) == 0)
534		args.sotype = SOCK_DGRAM;
535	if (findopt(iov, iovlen, "udp", NULL, NULL) == 0)
536		args.sotype = SOCK_DGRAM;
537	if (findopt(iov, iovlen, "tcp", NULL, NULL) == 0)
538		args.sotype = SOCK_STREAM;
539	if (findopt(iov, iovlen, "nfsv3", NULL, NULL) == 0)
540		args.flags |= NFSMNT_NFSV3;
541	if (findopt(iov, iovlen, "readdirsize", &opt, NULL) == 0) {
542		if (opt == NULL) {
543			errx(1, "illegal readdirsize");
544		}
545		ret = sscanf(opt, "%d", &args.readdirsize);
546		if (ret != 1 || args.readdirsize <= 0) {
547			errx(1, "illegal readdirsize: %s", opt);
548		}
549		args.flags |= NFSMNT_READDIRSIZE;
550	}
551	if (findopt(iov, iovlen, "readahead", &opt, NULL) == 0) {
552		if (opt == NULL) {
553			errx(1, "illegal readahead");
554		}
555		ret = sscanf(opt, "%d", &args.readahead);
556		if (ret != 1 || args.readahead <= 0) {
557			errx(1, "illegal readahead: %s", opt);
558		}
559		args.flags |= NFSMNT_READAHEAD;
560	}
561	if (findopt(iov, iovlen, "wsize", &opt, NULL) == 0) {
562		if (opt == NULL) {
563			errx(1, "illegal wsize");
564		}
565		ret = sscanf(opt, "%d", &args.wsize);
566		if (ret != 1 || args.wsize <= 0) {
567			errx(1, "illegal wsize: %s", opt);
568		}
569		args.flags |= NFSMNT_WSIZE;
570	}
571	if (findopt(iov, iovlen, "rsize", &opt, NULL) == 0) {
572		if (opt == NULL) {
573			errx(1, "illegal rsize");
574		}
575		ret = sscanf(opt, "%d", &args.rsize);
576		if (ret != 1 || args.rsize <= 0) {
577			errx(1, "illegal wsize: %s", opt);
578		}
579		args.flags |= NFSMNT_RSIZE;
580	}
581	if (findopt(iov, iovlen, "retrans", &opt, NULL) == 0) {
582		if (opt == NULL) {
583			errx(1, "illegal retrans");
584		}
585		ret = sscanf(opt, "%d", &args.retrans);
586		if (ret != 1 || args.retrans <= 0) {
587			errx(1, "illegal retrans: %s", opt);
588		}
589		args.flags |= NFSMNT_RETRANS;
590	}
591	if (findopt(iov, iovlen, "acregmin", &opt, NULL) == 0) {
592		ret = sscanf(opt, "%d", &args.acregmin);
593		if (ret != 1 || args.acregmin < 0) {
594			errx(1, "illegal acregmin: %s", opt);
595		}
596		args.flags |= NFSMNT_ACREGMIN;
597	}
598	if (findopt(iov, iovlen, "acregmax", &opt, NULL) == 0) {
599		ret = sscanf(opt, "%d", &args.acregmax);
600		if (ret != 1 || args.acregmax < 0) {
601			errx(1, "illegal acregmax: %s", opt);
602		}
603		args.flags |= NFSMNT_ACREGMAX;
604	}
605	if (findopt(iov, iovlen, "acdirmin", &opt, NULL) == 0) {
606		ret = sscanf(opt, "%d", &args.acdirmin);
607		if (ret != 1 || args.acdirmin < 0) {
608			errx(1, "illegal acdirmin: %s", opt);
609		}
610		args.flags |= NFSMNT_ACDIRMIN;
611	}
612	if (findopt(iov, iovlen, "acdirmax", &opt, NULL) == 0) {
613		ret = sscanf(opt, "%d", &args.acdirmax);
614		if (ret != 1 || args.acdirmax < 0) {
615			errx(1, "illegal acdirmax: %s", opt);
616		}
617		args.flags |= NFSMNT_ACDIRMAX;
618	}
619	if (findopt(iov, iovlen, "deadthresh", &opt, NULL) == 0) {
620		ret = sscanf(opt, "%d", &args.deadthresh);
621		if (ret != 1 || args.deadthresh <= 0) {
622			errx(1, "illegal deadthresh: %s", opt);
623		}
624		args.flags |= NFSMNT_DEADTHRESH;
625	}
626	if (findopt(iov, iovlen, "timeout", &opt, NULL) == 0) {
627		ret = sscanf(opt, "%d", &args.timeo);
628		if (ret != 1 || args.timeo <= 0) {
629			errx(1, "illegal timeout: %s", opt);
630		}
631		args.flags |= NFSMNT_TIMEO;
632	}
633	if (findopt(iov, iovlen, "maxgroups", &opt, NULL) == 0) {
634		ret = sscanf(opt, "%d", &args.maxgrouplist);
635		if (ret != 1 || args.timeo <= 0) {
636			errx(1, "illegal maxgroups: %s", opt);
637		}
638		args.flags |= NFSMNT_MAXGRPS;
639	}
640	if (findopt(iov, iovlen, "addr", &opt,
641		&args.addrlen) == 0) {
642		args.addr = (struct sockaddr *) opt;
643	}
644	if (findopt(iov, iovlen, "fh", &opt, &args.fhsize) == 0) {
645		args.fh = opt;
646	}
647	if (findopt(iov, iovlen, "hostname", &args.hostname,
648		NULL) == 0) {
649	}
650	if (args.hostname == NULL) {
651		errx(1, "Invalid hostname");
652	}
653
654	newiov = NULL;
655	newiovlen = 0;
656
657	build_iovec(&newiov, &newiovlen, "nfs_args", &args, sizeof(args));
658	copyopt(&newiov, &newiovlen, iov, iovlen, "fstype");
659	copyopt(&newiov, &newiovlen, iov, iovlen, "fspath");
660	copyopt(&newiov, &newiovlen, iov, iovlen, "errmsg");
661
662	return nmount(newiov, newiovlen, mntflags);
663}
664
665static int
666sec_name_to_num(char *sec)
667{
668	if (!strcmp(sec, "krb5"))
669		return (RPCSEC_GSS_KRB5);
670	if (!strcmp(sec, "krb5i"))
671		return (RPCSEC_GSS_KRB5I);
672	if (!strcmp(sec, "krb5p"))
673		return (RPCSEC_GSS_KRB5P);
674	if (!strcmp(sec, "sys"))
675		return (AUTH_SYS);
676	return (-1);
677}
678
679static char *
680sec_num_to_name(int flavor)
681{
682	switch (flavor) {
683	case RPCSEC_GSS_KRB5:
684		return ("krb5");
685	case RPCSEC_GSS_KRB5I:
686		return ("krb5i");
687	case RPCSEC_GSS_KRB5P:
688		return ("krb5p");
689	case AUTH_SYS:
690		return ("sys");
691	}
692	return (NULL);
693}
694
695static int
696getnfsargs(char *spec, struct iovec **iov, int *iovlen)
697{
698	struct addrinfo hints, *ai_nfs, *ai;
699	enum tryret ret;
700	int ecode, speclen, remoteerr, offset, have_bracket = 0;
701	char *hostp, *delimp, *errstr;
702	size_t len;
703	static char nam[MNAMELEN + 1], pname[MAXHOSTNAMELEN + 5];
704
705	if (*spec == '[' && (delimp = strchr(spec + 1, ']')) != NULL &&
706	    *(delimp + 1) == ':') {
707		hostp = spec + 1;
708		spec = delimp + 2;
709		have_bracket = 1;
710	} else if ((delimp = strrchr(spec, ':')) != NULL) {
711		hostp = spec;
712		spec = delimp + 1;
713	} else if ((delimp = strrchr(spec, '@')) != NULL) {
714		warnx("path@server syntax is deprecated, use server:path");
715		hostp = delimp + 1;
716	} else {
717		warnx("no <host>:<dirpath> nfs-name");
718		return (0);
719	}
720	*delimp = '\0';
721
722	/*
723	 * If there has been a trailing slash at mounttime it seems
724	 * that some mountd implementations fail to remove the mount
725	 * entries from their mountlist while unmounting.
726	 */
727	for (speclen = strlen(spec);
728		speclen > 1 && spec[speclen - 1] == '/';
729		speclen--)
730		spec[speclen - 1] = '\0';
731	if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
732		warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
733		return (0);
734	}
735	/* Make both '@' and ':' notations equal */
736	if (*hostp != '\0') {
737		len = strlen(hostp);
738		offset = 0;
739		if (have_bracket)
740			nam[offset++] = '[';
741		memmove(nam + offset, hostp, len);
742		if (have_bracket)
743			nam[len + offset++] = ']';
744		nam[len + offset++] = ':';
745		memmove(nam + len + offset, spec, speclen);
746		nam[len + speclen + offset] = '\0';
747	}
748
749	/*
750	 * Handle an internet host address.
751	 */
752	memset(&hints, 0, sizeof hints);
753	hints.ai_flags = AI_NUMERICHOST;
754	if (nfsproto == IPPROTO_TCP)
755		hints.ai_socktype = SOCK_STREAM;
756	else if (nfsproto == IPPROTO_UDP)
757		hints.ai_socktype = SOCK_DGRAM;
758
759	if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
760		hints.ai_flags = AI_CANONNAME;
761		if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
762		    != 0) {
763			if (portspec == NULL)
764				errx(1, "%s: %s", hostp, gai_strerror(ecode));
765			else
766				errx(1, "%s:%s: %s", hostp, portspec,
767				    gai_strerror(ecode));
768			return (0);
769		}
770
771		/*
772		 * For a Kerberized nfs mount where the "principal"
773		 * argument has not been set, add it here.
774		 */
775		if (got_principal == 0 && secflavor >= 0 &&
776		    secflavor != AUTH_SYS && ai_nfs->ai_canonname != NULL) {
777			snprintf(pname, sizeof (pname), "nfs@%s",
778			    ai_nfs->ai_canonname);
779			build_iovec(iov, iovlen, "principal", pname,
780			    strlen(pname) + 1);
781		}
782	}
783
784	ret = TRYRET_LOCALERR;
785	for (;;) {
786		/*
787		 * Try each entry returned by getaddrinfo(). Note the
788		 * occurence of remote errors by setting `remoteerr'.
789		 */
790		remoteerr = 0;
791		for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
792			if ((ai->ai_family == AF_INET6) &&
793			    (opflags & OF_NOINET6))
794				continue;
795			if ((ai->ai_family == AF_INET) &&
796			    (opflags & OF_NOINET4))
797				continue;
798			ret = nfs_tryproto(ai, hostp, spec, &errstr, iov,
799			    iovlen);
800			if (ret == TRYRET_SUCCESS)
801				break;
802			if (ret != TRYRET_LOCALERR)
803				remoteerr = 1;
804			if ((opflags & ISBGRND) == 0)
805				fprintf(stderr, "%s\n", errstr);
806		}
807		if (ret == TRYRET_SUCCESS)
808			break;
809
810		/* Exit if all errors were local. */
811		if (!remoteerr)
812			exit(1);
813
814		/*
815		 * If retrycnt == 0, we are to keep retrying forever.
816		 * Otherwise decrement it, and exit if it hits zero.
817		 */
818		if (retrycnt != 0 && --retrycnt == 0)
819			exit(1);
820
821		if ((opflags & (BGRND | ISBGRND)) == BGRND) {
822			warnx("Cannot immediately mount %s:%s, backgrounding",
823			    hostp, spec);
824			opflags |= ISBGRND;
825			if (daemon(0, 0) != 0)
826				err(1, "daemon");
827		}
828		sleep(60);
829	}
830	freeaddrinfo(ai_nfs);
831
832	build_iovec(iov, iovlen, "hostname", nam, (size_t)-1);
833	/* Add mounted file system to PATH_MOUNTTAB */
834	if (!add_mtab(hostp, spec))
835		warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
836	return (1);
837}
838
839/*
840 * Try to set up the NFS arguments according to the address
841 * family, protocol (and possibly port) specified in `ai'.
842 *
843 * Returns TRYRET_SUCCESS if successful, or:
844 *   TRYRET_TIMEOUT		The server did not respond.
845 *   TRYRET_REMOTEERR		The server reported an error.
846 *   TRYRET_LOCALERR		Local failure.
847 *
848 * In all error cases, *errstr will be set to a statically-allocated string
849 * describing the error.
850 */
851static enum tryret
852nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec, char **errstr,
853    struct iovec **iov, int *iovlen)
854{
855	static char errbuf[256];
856	struct sockaddr_storage nfs_ss;
857	struct netbuf nfs_nb;
858	struct nfhret nfhret;
859	struct timeval try;
860	struct rpc_err rpcerr;
861	CLIENT *clp;
862	struct netconfig *nconf, *nconf_mnt;
863	const char *netid, *netid_mnt;
864	char *secname;
865	int doconnect, nfsvers, mntvers, sotype;
866	enum clnt_stat stat;
867	enum mountmode trymntmode;
868
869	trymntmode = mountmode;
870	errbuf[0] = '\0';
871	*errstr = errbuf;
872
873	if (nfsproto == IPPROTO_TCP)
874		sotype = SOCK_STREAM;
875	else if (nfsproto == IPPROTO_UDP)
876		sotype = SOCK_DGRAM;
877
878	if ((netid = netidbytype(ai->ai_family, sotype)) == NULL) {
879		snprintf(errbuf, sizeof errbuf,
880		    "af %d sotype %d not supported", ai->ai_family, sotype);
881		return (TRYRET_LOCALERR);
882	}
883	if ((nconf = getnetconf_cached(netid)) == NULL) {
884		snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
885		return (TRYRET_LOCALERR);
886	}
887	/* The RPCPROG_MNT netid may be different. */
888	if (mnttcp_ok) {
889		netid_mnt = netid;
890		nconf_mnt = nconf;
891	} else {
892		if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
893		     == NULL) {
894			snprintf(errbuf, sizeof errbuf,
895			    "af %d sotype SOCK_DGRAM not supported",
896			     ai->ai_family);
897			return (TRYRET_LOCALERR);
898		}
899		if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
900			snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
901			    nc_sperror());
902			return (TRYRET_LOCALERR);
903		}
904	}
905
906tryagain:
907	if (trymntmode == V4) {
908		nfsvers = 4;
909	} else if (trymntmode == V2) {
910		nfsvers = 2;
911		mntvers = 1;
912	} else {
913		nfsvers = 3;
914		mntvers = 3;
915	}
916
917	if (portspec != NULL) {
918		/* `ai' contains the complete nfsd sockaddr. */
919		nfs_nb.buf = ai->ai_addr;
920		nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
921	} else {
922		/* Ask the remote rpcbind. */
923		nfs_nb.buf = &nfs_ss;
924		nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
925
926		if (!rpcb_getaddr(NFS_PROGRAM, nfsvers, nconf, &nfs_nb,
927		    hostp)) {
928			if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
929			    trymntmode == ANY) {
930				trymntmode = V2;
931				goto tryagain;
932			}
933			snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
934			    netid, hostp, spec,
935			    clnt_spcreateerror("RPCPROG_NFS"));
936			return (returncode(rpc_createerr.cf_stat,
937			    &rpc_createerr.cf_error));
938		}
939	}
940
941	/* Check that the server (nfsd) responds on the port we have chosen. */
942	clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, NFS_PROGRAM, nfsvers,
943	    0, 0);
944	if (clp == NULL) {
945		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
946		    hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
947		return (returncode(rpc_createerr.cf_stat,
948		    &rpc_createerr.cf_error));
949	}
950	if (sotype == SOCK_DGRAM && noconn == 0) {
951		/*
952		 * Use connect(), to match what the kernel does. This
953		 * catches cases where the server responds from the
954		 * wrong source address.
955		 */
956		doconnect = 1;
957		if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
958			clnt_destroy(clp);
959			snprintf(errbuf, sizeof errbuf,
960			    "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
961			    spec);
962			return (TRYRET_LOCALERR);
963		}
964	}
965
966	try.tv_sec = 10;
967	try.tv_usec = 0;
968	stat = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
969			 (xdrproc_t)xdr_void, NULL, try);
970	if (stat != RPC_SUCCESS) {
971		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
972			clnt_destroy(clp);
973			trymntmode = V2;
974			goto tryagain;
975		}
976		clnt_geterr(clp, &rpcerr);
977		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
978		    hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
979		clnt_destroy(clp);
980		return (returncode(stat, &rpcerr));
981	}
982	clnt_destroy(clp);
983
984	/*
985	 * For NFSv4, there is no mount protocol.
986	 */
987	if (trymntmode == V4) {
988		/*
989		 * Store the server address in nfsargsp, making
990		 * sure to copy any locally allocated structures.
991		 */
992		addrlen = nfs_nb.len;
993		addr = malloc(addrlen);
994		if (addr == NULL)
995			err(1, "malloc");
996		bcopy(nfs_nb.buf, addr, addrlen);
997
998		build_iovec(iov, iovlen, "addr", addr, addrlen);
999		secname = sec_num_to_name(secflavor);
1000		if (secname != NULL)
1001			build_iovec(iov, iovlen, "sec", secname, (size_t)-1);
1002		build_iovec(iov, iovlen, "nfsv4", NULL, 0);
1003		build_iovec(iov, iovlen, "dirpath", spec, (size_t)-1);
1004
1005		return (TRYRET_SUCCESS);
1006	}
1007
1008	/* Send the MOUNTPROC_MNT RPC to get the root filehandle. */
1009	try.tv_sec = 10;
1010	try.tv_usec = 0;
1011	clp = clnt_tp_create(hostp, MOUNTPROG, mntvers, nconf_mnt);
1012	if (clp == NULL) {
1013		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
1014		    hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
1015		return (returncode(rpc_createerr.cf_stat,
1016		    &rpc_createerr.cf_error));
1017	}
1018	clp->cl_auth = authsys_create_default();
1019	nfhret.auth = secflavor;
1020	nfhret.vers = mntvers;
1021	stat = clnt_call(clp, MOUNTPROC_MNT, (xdrproc_t)xdr_dir, spec,
1022			 (xdrproc_t)xdr_fh, &nfhret,
1023	    try);
1024	auth_destroy(clp->cl_auth);
1025	if (stat != RPC_SUCCESS) {
1026		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
1027			clnt_destroy(clp);
1028			trymntmode = V2;
1029			goto tryagain;
1030		}
1031		clnt_geterr(clp, &rpcerr);
1032		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
1033		    hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
1034		clnt_destroy(clp);
1035		return (returncode(stat, &rpcerr));
1036	}
1037	clnt_destroy(clp);
1038
1039	if (nfhret.stat != 0) {
1040		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
1041		    hostp, spec, strerror(nfhret.stat));
1042		return (TRYRET_REMOTEERR);
1043	}
1044
1045	/*
1046	 * Store the filehandle and server address in nfsargsp, making
1047	 * sure to copy any locally allocated structures.
1048	 */
1049	addrlen = nfs_nb.len;
1050	addr = malloc(addrlen);
1051	fhsize = nfhret.fhsize;
1052	fh = malloc(fhsize);
1053	if (addr == NULL || fh == NULL)
1054		err(1, "malloc");
1055	bcopy(nfs_nb.buf, addr, addrlen);
1056	bcopy(nfhret.nfh, fh, fhsize);
1057
1058	build_iovec(iov, iovlen, "addr", addr, addrlen);
1059	build_iovec(iov, iovlen, "fh", fh, fhsize);
1060	secname = sec_num_to_name(nfhret.auth);
1061	if (secname)
1062		build_iovec(iov, iovlen, "sec", secname, (size_t)-1);
1063	if (nfsvers == 3)
1064		build_iovec(iov, iovlen, "nfsv3", NULL, 0);
1065
1066	return (TRYRET_SUCCESS);
1067}
1068
1069/*
1070 * Catagorise a RPC return status and error into an `enum tryret'
1071 * return code.
1072 */
1073static enum tryret
1074returncode(enum clnt_stat stat, struct rpc_err *rpcerr)
1075{
1076	switch (stat) {
1077	case RPC_TIMEDOUT:
1078		return (TRYRET_TIMEOUT);
1079	case RPC_PMAPFAILURE:
1080	case RPC_PROGNOTREGISTERED:
1081	case RPC_PROGVERSMISMATCH:
1082	/* XXX, these can be local or remote. */
1083	case RPC_CANTSEND:
1084	case RPC_CANTRECV:
1085		return (TRYRET_REMOTEERR);
1086	case RPC_SYSTEMERROR:
1087		switch (rpcerr->re_errno) {
1088		case ETIMEDOUT:
1089			return (TRYRET_TIMEOUT);
1090		case ENOMEM:
1091			break;
1092		default:
1093			return (TRYRET_REMOTEERR);
1094		}
1095		/* FALLTHROUGH */
1096	default:
1097		break;
1098	}
1099	return (TRYRET_LOCALERR);
1100}
1101
1102/*
1103 * Look up a netid based on an address family and socket type.
1104 * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
1105 *
1106 * XXX there should be a library function for this.
1107 */
1108static const char *
1109netidbytype(int af, int sotype)
1110{
1111	struct nc_protos *p;
1112
1113	for (p = nc_protos; p->netid != NULL; p++) {
1114		if (af != p->af || sotype != p->sotype)
1115			continue;
1116		return (p->netid);
1117	}
1118	return (NULL);
1119}
1120
1121/*
1122 * Look up a netconfig entry based on a netid, and cache the result so
1123 * that we don't need to remember to call freenetconfigent().
1124 *
1125 * Otherwise it behaves just like getnetconfigent(), so nc_*error()
1126 * work on failure.
1127 */
1128static struct netconfig *
1129getnetconf_cached(const char *netid)
1130{
1131	static struct nc_entry {
1132		struct netconfig *nconf;
1133		struct nc_entry *next;
1134	} *head;
1135	struct nc_entry *p;
1136	struct netconfig *nconf;
1137
1138	for (p = head; p != NULL; p = p->next)
1139		if (strcmp(netid, p->nconf->nc_netid) == 0)
1140			return (p->nconf);
1141
1142	if ((nconf = getnetconfigent(netid)) == NULL)
1143		return (NULL);
1144	if ((p = malloc(sizeof(*p))) == NULL)
1145		err(1, "malloc");
1146	p->nconf = nconf;
1147	p->next = head;
1148	head = p;
1149
1150	return (p->nconf);
1151}
1152
1153/*
1154 * xdr routines for mount rpc's
1155 */
1156static int
1157xdr_dir(XDR *xdrsp, char *dirp)
1158{
1159	return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1160}
1161
1162static int
1163xdr_fh(XDR *xdrsp, struct nfhret *np)
1164{
1165	int i;
1166	long auth, authcnt, authfnd = 0;
1167
1168	if (!xdr_u_long(xdrsp, &np->stat))
1169		return (0);
1170	if (np->stat)
1171		return (1);
1172	switch (np->vers) {
1173	case 1:
1174		np->fhsize = NFS_FHSIZE;
1175		return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFS_FHSIZE));
1176	case 3:
1177		if (!xdr_long(xdrsp, &np->fhsize))
1178			return (0);
1179		if (np->fhsize <= 0 || np->fhsize > NFS3_FHSIZE)
1180			return (0);
1181		if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
1182			return (0);
1183		if (!xdr_long(xdrsp, &authcnt))
1184			return (0);
1185		for (i = 0; i < authcnt; i++) {
1186			if (!xdr_long(xdrsp, &auth))
1187				return (0);
1188			if (np->auth == -1) {
1189				np->auth = auth;
1190				authfnd++;
1191			} else if (auth == np->auth) {
1192				authfnd++;
1193			}
1194		}
1195		/*
1196		 * Some servers, such as DEC's OSF/1 return a nil authenticator
1197		 * list to indicate RPCAUTH_UNIX.
1198		 */
1199		if (authcnt == 0 && np->auth == -1)
1200			np->auth = AUTH_SYS;
1201		if (!authfnd && (authcnt > 0 || np->auth != AUTH_SYS))
1202			np->stat = EAUTH;
1203		return (1);
1204	};
1205	return (0);
1206}
1207
1208static void
1209usage(void)
1210{
1211	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
1212"usage: mount_nfs [-23bcdiLlNPsTU] [-a maxreadahead] [-D deadthresh]",
1213"                 [-g maxgroups] [-I readdirsize] [-o options] [-R retrycnt]",
1214"                 [-r readsize] [-t timeout] [-w writesize] [-x retrans]",
1215"                 rhost:path node");
1216	exit(1);
1217}
1218