mount_nfs.c revision 221124 
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 221124 2011-04-27 17:51:51Z rmacklem $");
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 readahead=<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("-L 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 = "nfs";
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 fstye is "oldnfs", run the old NFS client unless the
385	 * "nfsv4" option was specified.
386	 */
387	if (strcmp(fstype, "nfs") == 0) {
388		if (modfind("nfscl") < 0) {
389			/* Not present in kernel, try loading it */
390			if (kldload("nfscl") < 0 ||
391			    modfind("nfscl") < 0)
392				errx(1, "nfscl is not available");
393		}
394	}
395
396	/*
397	 * Add the fqdn to the gssname, as required.
398	 */
399	if (gssname != NULL) {
400		if (strchr(gssname, '@') == NULL &&
401		    gethostname(hostname, MAXHOSTNAMELEN) == 0) {
402			snprintf(gssn, sizeof (gssn), "%s@%s", gssname,
403			    hostname);
404			gssname = gssn;
405		}
406		build_iovec(&iov, &iovlen, "gssname", gssname,
407		    strlen(gssname) + 1);
408	}
409
410	if (!getnfsargs(spec, &iov, &iovlen))
411		exit(1);
412
413	/* resolve the mountpoint with realpath(3) */
414	(void)checkpath(name, mntpath);
415
416	build_iovec(&iov, &iovlen, "fstype", fstype, (size_t)-1);
417	build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
418	build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
419
420	/*
421	 * XXX:
422	 * Backwards compatibility routines for older kernels.
423	 * Remove this and fallback_mount() code when we do not need to support
424	 * NFS mounts against older kernels which still need
425	 * struct nfs_args to be passed in via nmount().
426	 */
427	osversion = getosreldate();
428	if (osversion >= 702100) {
429		if (nmount(iov, iovlen, mntflags))
430			err(1, "%s, %s", mntpath, errmsg);
431	} else {
432		if (fallback_mount(iov, iovlen, mntflags))
433			err(1, "%s, %s", mntpath, errmsg);
434	}
435
436	exit(0);
437}
438
439static int
440findopt(struct iovec *iov, int iovlen, const char *name,
441    char **valuep, int *lenp)
442{
443	int i;
444
445	for (i = 0; i < iovlen/2; i++, iov += 2) {
446		if (strcmp(name, iov[0].iov_base) == 0) {
447			if (valuep)
448				*valuep = iov[1].iov_base;
449			if (lenp)
450				*lenp = iov[1].iov_len;
451			return (0);
452		}
453	}
454	return (ENOENT);
455}
456
457static void
458copyopt(struct iovec **newiov, int *newiovlen,
459    struct iovec *iov, int iovlen, const char *name)
460{
461	char *value;
462	int len;
463
464	if (findopt(iov, iovlen, name, &value, &len) == 0)
465		build_iovec(newiov, newiovlen, name, value, len);
466}
467
468/*
469 * XXX: This function is provided for backwards
470 *      compatibility with older kernels which did not support
471 *      passing NFS mount options to nmount() as individual
472 *      parameters.  It should be eventually be removed.
473 */
474static int
475fallback_mount(struct iovec *iov, int iovlen, int mntflags)
476{
477	struct nfs_args args = {
478	    .version = NFS_ARGSVERSION,
479	    .addr = NULL,
480	    .addrlen = sizeof (struct sockaddr_in),
481	    .sotype = SOCK_STREAM,
482	    .proto = 0,
483	    .fh = NULL,
484	    .fhsize = 0,
485	    .flags = NFSMNT_RESVPORT,
486	    .wsize = NFS_WSIZE,
487	    .rsize = NFS_RSIZE,
488	    .readdirsize = NFS_READDIRSIZE,
489	    .timeo = 10,
490	    .retrans = NFS_RETRANS,
491	    .maxgrouplist = NFS_MAXGRPS,
492	    .readahead = NFS_DEFRAHEAD,
493	    .wcommitsize = 0,			/* was: NQ_DEFLEASE */
494	    .deadthresh = NFS_MAXDEADTHRESH,	/* was: NQ_DEADTHRESH */
495	    .hostname = NULL,
496	    /* args version 4 */
497	    .acregmin = NFS_MINATTRTIMO,
498	    .acregmax = NFS_MAXATTRTIMO,
499	    .acdirmin = NFS_MINDIRATTRTIMO,
500	    .acdirmax = NFS_MAXDIRATTRTIMO,
501	};
502	int ret;
503	char *opt;
504	struct iovec *newiov;
505	int newiovlen;
506
507	if (findopt(iov, iovlen, "dumbtimer", NULL, NULL) == 0)
508		args.flags |= NFSMNT_DUMBTIMR;
509	if (findopt(iov, iovlen, "noconn", NULL, NULL) == 0)
510		args.flags |= NFSMNT_NOCONN;
511	if (findopt(iov, iovlen, "conn", NULL, NULL) == 0)
512		args.flags |= NFSMNT_NOCONN;
513	if (findopt(iov, iovlen, "nolockd", NULL, NULL) == 0)
514		args.flags |= NFSMNT_NOLOCKD;
515	if (findopt(iov, iovlen, "lockd", NULL, NULL) == 0)
516		args.flags &= ~NFSMNT_NOLOCKD;
517	if (findopt(iov, iovlen, "intr", NULL, NULL) == 0)
518		args.flags |= NFSMNT_INT;
519	if (findopt(iov, iovlen, "rdirplus", NULL, NULL) == 0)
520		args.flags |= NFSMNT_RDIRPLUS;
521	if (findopt(iov, iovlen, "resvport", NULL, NULL) == 0)
522		args.flags |= NFSMNT_RESVPORT;
523	if (findopt(iov, iovlen, "noresvport", NULL, NULL) == 0)
524		args.flags &= ~NFSMNT_RESVPORT;
525	if (findopt(iov, iovlen, "soft", NULL, NULL) == 0)
526		args.flags |= NFSMNT_SOFT;
527	if (findopt(iov, iovlen, "hard", NULL, NULL) == 0)
528		args.flags &= ~NFSMNT_SOFT;
529	if (findopt(iov, iovlen, "mntudp", NULL, NULL) == 0)
530		args.sotype = SOCK_DGRAM;
531	if (findopt(iov, iovlen, "udp", NULL, NULL) == 0)
532		args.sotype = SOCK_DGRAM;
533	if (findopt(iov, iovlen, "tcp", NULL, NULL) == 0)
534		args.sotype = SOCK_STREAM;
535	if (findopt(iov, iovlen, "nfsv3", NULL, NULL) == 0)
536		args.flags |= NFSMNT_NFSV3;
537	if (findopt(iov, iovlen, "readdirsize", &opt, NULL) == 0) {
538		if (opt == NULL) {
539			errx(1, "illegal readdirsize");
540		}
541		ret = sscanf(opt, "%d", &args.readdirsize);
542		if (ret != 1 || args.readdirsize <= 0) {
543			errx(1, "illegal readdirsize: %s", opt);
544		}
545		args.flags |= NFSMNT_READDIRSIZE;
546	}
547	if (findopt(iov, iovlen, "readahead", &opt, NULL) == 0) {
548		if (opt == NULL) {
549			errx(1, "illegal readahead");
550		}
551		ret = sscanf(opt, "%d", &args.readahead);
552		if (ret != 1 || args.readahead <= 0) {
553			errx(1, "illegal readahead: %s", opt);
554		}
555		args.flags |= NFSMNT_READAHEAD;
556	}
557	if (findopt(iov, iovlen, "wsize", &opt, NULL) == 0) {
558		if (opt == NULL) {
559			errx(1, "illegal wsize");
560		}
561		ret = sscanf(opt, "%d", &args.wsize);
562		if (ret != 1 || args.wsize <= 0) {
563			errx(1, "illegal wsize: %s", opt);
564		}
565		args.flags |= NFSMNT_WSIZE;
566	}
567	if (findopt(iov, iovlen, "rsize", &opt, NULL) == 0) {
568		if (opt == NULL) {
569			errx(1, "illegal rsize");
570		}
571		ret = sscanf(opt, "%d", &args.rsize);
572		if (ret != 1 || args.rsize <= 0) {
573			errx(1, "illegal wsize: %s", opt);
574		}
575		args.flags |= NFSMNT_RSIZE;
576	}
577	if (findopt(iov, iovlen, "retrans", &opt, NULL) == 0) {
578		if (opt == NULL) {
579			errx(1, "illegal retrans");
580		}
581		ret = sscanf(opt, "%d", &args.retrans);
582		if (ret != 1 || args.retrans <= 0) {
583			errx(1, "illegal retrans: %s", opt);
584		}
585		args.flags |= NFSMNT_RETRANS;
586	}
587	if (findopt(iov, iovlen, "acregmin", &opt, NULL) == 0) {
588		ret = sscanf(opt, "%d", &args.acregmin);
589		if (ret != 1 || args.acregmin < 0) {
590			errx(1, "illegal acregmin: %s", opt);
591		}
592		args.flags |= NFSMNT_ACREGMIN;
593	}
594	if (findopt(iov, iovlen, "acregmax", &opt, NULL) == 0) {
595		ret = sscanf(opt, "%d", &args.acregmax);
596		if (ret != 1 || args.acregmax < 0) {
597			errx(1, "illegal acregmax: %s", opt);
598		}
599		args.flags |= NFSMNT_ACREGMAX;
600	}
601	if (findopt(iov, iovlen, "acdirmin", &opt, NULL) == 0) {
602		ret = sscanf(opt, "%d", &args.acdirmin);
603		if (ret != 1 || args.acdirmin < 0) {
604			errx(1, "illegal acdirmin: %s", opt);
605		}
606		args.flags |= NFSMNT_ACDIRMIN;
607	}
608	if (findopt(iov, iovlen, "acdirmax", &opt, NULL) == 0) {
609		ret = sscanf(opt, "%d", &args.acdirmax);
610		if (ret != 1 || args.acdirmax < 0) {
611			errx(1, "illegal acdirmax: %s", opt);
612		}
613		args.flags |= NFSMNT_ACDIRMAX;
614	}
615	if (findopt(iov, iovlen, "deadthresh", &opt, NULL) == 0) {
616		ret = sscanf(opt, "%d", &args.deadthresh);
617		if (ret != 1 || args.deadthresh <= 0) {
618			errx(1, "illegal deadthresh: %s", opt);
619		}
620		args.flags |= NFSMNT_DEADTHRESH;
621	}
622	if (findopt(iov, iovlen, "timeout", &opt, NULL) == 0) {
623		ret = sscanf(opt, "%d", &args.timeo);
624		if (ret != 1 || args.timeo <= 0) {
625			errx(1, "illegal timeout: %s", opt);
626		}
627		args.flags |= NFSMNT_TIMEO;
628	}
629	if (findopt(iov, iovlen, "maxgroups", &opt, NULL) == 0) {
630		ret = sscanf(opt, "%d", &args.maxgrouplist);
631		if (ret != 1 || args.timeo <= 0) {
632			errx(1, "illegal maxgroups: %s", opt);
633		}
634		args.flags |= NFSMNT_MAXGRPS;
635	}
636	if (findopt(iov, iovlen, "addr", &opt,
637		&args.addrlen) == 0) {
638		args.addr = (struct sockaddr *) opt;
639	}
640	if (findopt(iov, iovlen, "fh", &opt, &args.fhsize) == 0) {
641		args.fh = opt;
642	}
643	if (findopt(iov, iovlen, "hostname", &args.hostname,
644		NULL) == 0) {
645	}
646	if (args.hostname == NULL) {
647		errx(1, "Invalid hostname");
648	}
649
650	newiov = NULL;
651	newiovlen = 0;
652
653	build_iovec(&newiov, &newiovlen, "nfs_args", &args, sizeof(args));
654	copyopt(&newiov, &newiovlen, iov, iovlen, "fstype");
655	copyopt(&newiov, &newiovlen, iov, iovlen, "fspath");
656	copyopt(&newiov, &newiovlen, iov, iovlen, "errmsg");
657
658	return nmount(newiov, newiovlen, mntflags);
659}
660
661static int
662sec_name_to_num(char *sec)
663{
664	if (!strcmp(sec, "krb5"))
665		return (RPCSEC_GSS_KRB5);
666	if (!strcmp(sec, "krb5i"))
667		return (RPCSEC_GSS_KRB5I);
668	if (!strcmp(sec, "krb5p"))
669		return (RPCSEC_GSS_KRB5P);
670	if (!strcmp(sec, "sys"))
671		return (AUTH_SYS);
672	return (-1);
673}
674
675static char *
676sec_num_to_name(int flavor)
677{
678	switch (flavor) {
679	case RPCSEC_GSS_KRB5:
680		return ("krb5");
681	case RPCSEC_GSS_KRB5I:
682		return ("krb5i");
683	case RPCSEC_GSS_KRB5P:
684		return ("krb5p");
685	case AUTH_SYS:
686		return ("sys");
687	}
688	return (NULL);
689}
690
691static int
692getnfsargs(char *spec, struct iovec **iov, int *iovlen)
693{
694	struct addrinfo hints, *ai_nfs, *ai;
695	enum tryret ret;
696	int ecode, speclen, remoteerr, offset, have_bracket = 0;
697	char *hostp, *delimp, *errstr;
698	size_t len;
699	static char nam[MNAMELEN + 1], pname[MAXHOSTNAMELEN + 5];
700
701	if (*spec == '[' && (delimp = strchr(spec + 1, ']')) != NULL &&
702	    *(delimp + 1) == ':') {
703		hostp = spec + 1;
704		spec = delimp + 2;
705		have_bracket = 1;
706	} else if ((delimp = strrchr(spec, ':')) != NULL) {
707		hostp = spec;
708		spec = delimp + 1;
709	} else if ((delimp = strrchr(spec, '@')) != NULL) {
710		warnx("path@server syntax is deprecated, use server:path");
711		hostp = delimp + 1;
712	} else {
713		warnx("no <host>:<dirpath> nfs-name");
714		return (0);
715	}
716	*delimp = '\0';
717
718	/*
719	 * If there has been a trailing slash at mounttime it seems
720	 * that some mountd implementations fail to remove the mount
721	 * entries from their mountlist while unmounting.
722	 */
723	for (speclen = strlen(spec);
724		speclen > 1 && spec[speclen - 1] == '/';
725		speclen--)
726		spec[speclen - 1] = '\0';
727	if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
728		warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
729		return (0);
730	}
731	/* Make both '@' and ':' notations equal */
732	if (*hostp != '\0') {
733		len = strlen(hostp);
734		offset = 0;
735		if (have_bracket)
736			nam[offset++] = '[';
737		memmove(nam + offset, hostp, len);
738		if (have_bracket)
739			nam[len + offset++] = ']';
740		nam[len + offset++] = ':';
741		memmove(nam + len + offset, spec, speclen);
742		nam[len + speclen + offset] = '\0';
743	}
744
745	/*
746	 * Handle an internet host address.
747	 */
748	memset(&hints, 0, sizeof hints);
749	hints.ai_flags = AI_NUMERICHOST;
750	if (nfsproto == IPPROTO_TCP)
751		hints.ai_socktype = SOCK_STREAM;
752	else if (nfsproto == IPPROTO_UDP)
753		hints.ai_socktype = SOCK_DGRAM;
754
755	if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
756		hints.ai_flags = AI_CANONNAME;
757		if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
758		    != 0) {
759			if (portspec == NULL)
760				errx(1, "%s: %s", hostp, gai_strerror(ecode));
761			else
762				errx(1, "%s:%s: %s", hostp, portspec,
763				    gai_strerror(ecode));
764			return (0);
765		}
766
767		/*
768		 * For a Kerberized nfs mount where the "principal"
769		 * argument has not been set, add it here.
770		 */
771		if (got_principal == 0 && secflavor >= 0 &&
772		    secflavor != AUTH_SYS && ai_nfs->ai_canonname != NULL) {
773			snprintf(pname, sizeof (pname), "nfs@%s",
774			    ai_nfs->ai_canonname);
775			build_iovec(iov, iovlen, "principal", pname,
776			    strlen(pname) + 1);
777		}
778	}
779
780	ret = TRYRET_LOCALERR;
781	for (;;) {
782		/*
783		 * Try each entry returned by getaddrinfo(). Note the
784		 * occurence of remote errors by setting `remoteerr'.
785		 */
786		remoteerr = 0;
787		for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
788			if ((ai->ai_family == AF_INET6) &&
789			    (opflags & OF_NOINET6))
790				continue;
791			if ((ai->ai_family == AF_INET) &&
792			    (opflags & OF_NOINET4))
793				continue;
794			ret = nfs_tryproto(ai, hostp, spec, &errstr, iov,
795			    iovlen);
796			if (ret == TRYRET_SUCCESS)
797				break;
798			if (ret != TRYRET_LOCALERR)
799				remoteerr = 1;
800			if ((opflags & ISBGRND) == 0)
801				fprintf(stderr, "%s\n", errstr);
802		}
803		if (ret == TRYRET_SUCCESS)
804			break;
805
806		/* Exit if all errors were local. */
807		if (!remoteerr)
808			exit(1);
809
810		/*
811		 * If retrycnt == 0, we are to keep retrying forever.
812		 * Otherwise decrement it, and exit if it hits zero.
813		 */
814		if (retrycnt != 0 && --retrycnt == 0)
815			exit(1);
816
817		if ((opflags & (BGRND | ISBGRND)) == BGRND) {
818			warnx("Cannot immediately mount %s:%s, backgrounding",
819			    hostp, spec);
820			opflags |= ISBGRND;
821			if (daemon(0, 0) != 0)
822				err(1, "daemon");
823		}
824		sleep(60);
825	}
826	freeaddrinfo(ai_nfs);
827
828	build_iovec(iov, iovlen, "hostname", nam, (size_t)-1);
829	/* Add mounted file system to PATH_MOUNTTAB */
830	if (!add_mtab(hostp, spec))
831		warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
832	return (1);
833}
834
835/*
836 * Try to set up the NFS arguments according to the address
837 * family, protocol (and possibly port) specified in `ai'.
838 *
839 * Returns TRYRET_SUCCESS if successful, or:
840 *   TRYRET_TIMEOUT		The server did not respond.
841 *   TRYRET_REMOTEERR		The server reported an error.
842 *   TRYRET_LOCALERR		Local failure.
843 *
844 * In all error cases, *errstr will be set to a statically-allocated string
845 * describing the error.
846 */
847static enum tryret
848nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec, char **errstr,
849    struct iovec **iov, int *iovlen)
850{
851	static char errbuf[256];
852	struct sockaddr_storage nfs_ss;
853	struct netbuf nfs_nb;
854	struct nfhret nfhret;
855	struct timeval try;
856	struct rpc_err rpcerr;
857	CLIENT *clp;
858	struct netconfig *nconf, *nconf_mnt;
859	const char *netid, *netid_mnt;
860	char *secname;
861	int doconnect, nfsvers, mntvers, sotype;
862	enum clnt_stat stat;
863	enum mountmode trymntmode;
864
865	sotype = 0;
866	trymntmode = mountmode;
867	errbuf[0] = '\0';
868	*errstr = errbuf;
869
870	if (nfsproto == IPPROTO_TCP)
871		sotype = SOCK_STREAM;
872	else if (nfsproto == IPPROTO_UDP)
873		sotype = SOCK_DGRAM;
874
875	if ((netid = netidbytype(ai->ai_family, sotype)) == NULL) {
876		snprintf(errbuf, sizeof errbuf,
877		    "af %d sotype %d not supported", ai->ai_family, sotype);
878		return (TRYRET_LOCALERR);
879	}
880	if ((nconf = getnetconf_cached(netid)) == NULL) {
881		snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
882		return (TRYRET_LOCALERR);
883	}
884	/* The RPCPROG_MNT netid may be different. */
885	if (mnttcp_ok) {
886		netid_mnt = netid;
887		nconf_mnt = nconf;
888	} else {
889		if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
890		     == NULL) {
891			snprintf(errbuf, sizeof errbuf,
892			    "af %d sotype SOCK_DGRAM not supported",
893			     ai->ai_family);
894			return (TRYRET_LOCALERR);
895		}
896		if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
897			snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
898			    nc_sperror());
899			return (TRYRET_LOCALERR);
900		}
901	}
902
903tryagain:
904	if (trymntmode == V4) {
905		nfsvers = 4;
906	} else if (trymntmode == V2) {
907		nfsvers = 2;
908		mntvers = 1;
909	} else {
910		nfsvers = 3;
911		mntvers = 3;
912	}
913
914	if (portspec != NULL) {
915		/* `ai' contains the complete nfsd sockaddr. */
916		nfs_nb.buf = ai->ai_addr;
917		nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
918	} else {
919		/* Ask the remote rpcbind. */
920		nfs_nb.buf = &nfs_ss;
921		nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
922
923		if (!rpcb_getaddr(NFS_PROGRAM, nfsvers, nconf, &nfs_nb,
924		    hostp)) {
925			if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
926			    trymntmode == ANY) {
927				trymntmode = V2;
928				goto tryagain;
929			}
930			snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
931			    netid, hostp, spec,
932			    clnt_spcreateerror("RPCPROG_NFS"));
933			return (returncode(rpc_createerr.cf_stat,
934			    &rpc_createerr.cf_error));
935		}
936	}
937
938	/* Check that the server (nfsd) responds on the port we have chosen. */
939	clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, NFS_PROGRAM, nfsvers,
940	    0, 0);
941	if (clp == NULL) {
942		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
943		    hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
944		return (returncode(rpc_createerr.cf_stat,
945		    &rpc_createerr.cf_error));
946	}
947	if (sotype == SOCK_DGRAM && noconn == 0) {
948		/*
949		 * Use connect(), to match what the kernel does. This
950		 * catches cases where the server responds from the
951		 * wrong source address.
952		 */
953		doconnect = 1;
954		if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
955			clnt_destroy(clp);
956			snprintf(errbuf, sizeof errbuf,
957			    "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
958			    spec);
959			return (TRYRET_LOCALERR);
960		}
961	}
962
963	try.tv_sec = 10;
964	try.tv_usec = 0;
965	stat = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
966			 (xdrproc_t)xdr_void, NULL, try);
967	if (stat != RPC_SUCCESS) {
968		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
969			clnt_destroy(clp);
970			trymntmode = V2;
971			goto tryagain;
972		}
973		clnt_geterr(clp, &rpcerr);
974		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
975		    hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
976		clnt_destroy(clp);
977		return (returncode(stat, &rpcerr));
978	}
979	clnt_destroy(clp);
980
981	/*
982	 * For NFSv4, there is no mount protocol.
983	 */
984	if (trymntmode == V4) {
985		/*
986		 * Store the server address in nfsargsp, making
987		 * sure to copy any locally allocated structures.
988		 */
989		addrlen = nfs_nb.len;
990		addr = malloc(addrlen);
991		if (addr == NULL)
992			err(1, "malloc");
993		bcopy(nfs_nb.buf, addr, addrlen);
994
995		build_iovec(iov, iovlen, "addr", addr, addrlen);
996		secname = sec_num_to_name(secflavor);
997		if (secname != NULL)
998			build_iovec(iov, iovlen, "sec", secname, (size_t)-1);
999		build_iovec(iov, iovlen, "nfsv4", NULL, 0);
1000		build_iovec(iov, iovlen, "dirpath", spec, (size_t)-1);
1001
1002		return (TRYRET_SUCCESS);
1003	}
1004
1005	/* Send the MOUNTPROC_MNT RPC to get the root filehandle. */
1006	try.tv_sec = 10;
1007	try.tv_usec = 0;
1008	clp = clnt_tp_create(hostp, MOUNTPROG, mntvers, nconf_mnt);
1009	if (clp == NULL) {
1010		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
1011		    hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
1012		return (returncode(rpc_createerr.cf_stat,
1013		    &rpc_createerr.cf_error));
1014	}
1015	clp->cl_auth = authsys_create_default();
1016	nfhret.auth = secflavor;
1017	nfhret.vers = mntvers;
1018	stat = clnt_call(clp, MOUNTPROC_MNT, (xdrproc_t)xdr_dir, spec,
1019			 (xdrproc_t)xdr_fh, &nfhret,
1020	    try);
1021	auth_destroy(clp->cl_auth);
1022	if (stat != RPC_SUCCESS) {
1023		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
1024			clnt_destroy(clp);
1025			trymntmode = V2;
1026			goto tryagain;
1027		}
1028		clnt_geterr(clp, &rpcerr);
1029		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
1030		    hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
1031		clnt_destroy(clp);
1032		return (returncode(stat, &rpcerr));
1033	}
1034	clnt_destroy(clp);
1035
1036	if (nfhret.stat != 0) {
1037		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
1038		    hostp, spec, strerror(nfhret.stat));
1039		return (TRYRET_REMOTEERR);
1040	}
1041
1042	/*
1043	 * Store the filehandle and server address in nfsargsp, making
1044	 * sure to copy any locally allocated structures.
1045	 */
1046	addrlen = nfs_nb.len;
1047	addr = malloc(addrlen);
1048	fhsize = nfhret.fhsize;
1049	fh = malloc(fhsize);
1050	if (addr == NULL || fh == NULL)
1051		err(1, "malloc");
1052	bcopy(nfs_nb.buf, addr, addrlen);
1053	bcopy(nfhret.nfh, fh, fhsize);
1054
1055	build_iovec(iov, iovlen, "addr", addr, addrlen);
1056	build_iovec(iov, iovlen, "fh", fh, fhsize);
1057	secname = sec_num_to_name(nfhret.auth);
1058	if (secname)
1059		build_iovec(iov, iovlen, "sec", secname, (size_t)-1);
1060	if (nfsvers == 3)
1061		build_iovec(iov, iovlen, "nfsv3", NULL, 0);
1062
1063	return (TRYRET_SUCCESS);
1064}
1065
1066/*
1067 * Catagorise a RPC return status and error into an `enum tryret'
1068 * return code.
1069 */
1070static enum tryret
1071returncode(enum clnt_stat stat, struct rpc_err *rpcerr)
1072{
1073	switch (stat) {
1074	case RPC_TIMEDOUT:
1075		return (TRYRET_TIMEOUT);
1076	case RPC_PMAPFAILURE:
1077	case RPC_PROGNOTREGISTERED:
1078	case RPC_PROGVERSMISMATCH:
1079	/* XXX, these can be local or remote. */
1080	case RPC_CANTSEND:
1081	case RPC_CANTRECV:
1082		return (TRYRET_REMOTEERR);
1083	case RPC_SYSTEMERROR:
1084		switch (rpcerr->re_errno) {
1085		case ETIMEDOUT:
1086			return (TRYRET_TIMEOUT);
1087		case ENOMEM:
1088			break;
1089		default:
1090			return (TRYRET_REMOTEERR);
1091		}
1092		/* FALLTHROUGH */
1093	default:
1094		break;
1095	}
1096	return (TRYRET_LOCALERR);
1097}
1098
1099/*
1100 * Look up a netid based on an address family and socket type.
1101 * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
1102 *
1103 * XXX there should be a library function for this.
1104 */
1105static const char *
1106netidbytype(int af, int sotype)
1107{
1108	struct nc_protos *p;
1109
1110	for (p = nc_protos; p->netid != NULL; p++) {
1111		if (af != p->af || sotype != p->sotype)
1112			continue;
1113		return (p->netid);
1114	}
1115	return (NULL);
1116}
1117
1118/*
1119 * Look up a netconfig entry based on a netid, and cache the result so
1120 * that we don't need to remember to call freenetconfigent().
1121 *
1122 * Otherwise it behaves just like getnetconfigent(), so nc_*error()
1123 * work on failure.
1124 */
1125static struct netconfig *
1126getnetconf_cached(const char *netid)
1127{
1128	static struct nc_entry {
1129		struct netconfig *nconf;
1130		struct nc_entry *next;
1131	} *head;
1132	struct nc_entry *p;
1133	struct netconfig *nconf;
1134
1135	for (p = head; p != NULL; p = p->next)
1136		if (strcmp(netid, p->nconf->nc_netid) == 0)
1137			return (p->nconf);
1138
1139	if ((nconf = getnetconfigent(netid)) == NULL)
1140		return (NULL);
1141	if ((p = malloc(sizeof(*p))) == NULL)
1142		err(1, "malloc");
1143	p->nconf = nconf;
1144	p->next = head;
1145	head = p;
1146
1147	return (p->nconf);
1148}
1149
1150/*
1151 * xdr routines for mount rpc's
1152 */
1153static int
1154xdr_dir(XDR *xdrsp, char *dirp)
1155{
1156	return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1157}
1158
1159static int
1160xdr_fh(XDR *xdrsp, struct nfhret *np)
1161{
1162	int i;
1163	long auth, authcnt, authfnd = 0;
1164
1165	if (!xdr_u_long(xdrsp, &np->stat))
1166		return (0);
1167	if (np->stat)
1168		return (1);
1169	switch (np->vers) {
1170	case 1:
1171		np->fhsize = NFS_FHSIZE;
1172		return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFS_FHSIZE));
1173	case 3:
1174		if (!xdr_long(xdrsp, &np->fhsize))
1175			return (0);
1176		if (np->fhsize <= 0 || np->fhsize > NFS3_FHSIZE)
1177			return (0);
1178		if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
1179			return (0);
1180		if (!xdr_long(xdrsp, &authcnt))
1181			return (0);
1182		for (i = 0; i < authcnt; i++) {
1183			if (!xdr_long(xdrsp, &auth))
1184				return (0);
1185			if (np->auth == -1) {
1186				np->auth = auth;
1187				authfnd++;
1188			} else if (auth == np->auth) {
1189				authfnd++;
1190			}
1191		}
1192		/*
1193		 * Some servers, such as DEC's OSF/1 return a nil authenticator
1194		 * list to indicate RPCAUTH_UNIX.
1195		 */
1196		if (authcnt == 0 && np->auth == -1)
1197			np->auth = AUTH_SYS;
1198		if (!authfnd && (authcnt > 0 || np->auth != AUTH_SYS))
1199			np->stat = EAUTH;
1200		return (1);
1201	};
1202	return (0);
1203}
1204
1205static void
1206usage(void)
1207{
1208	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
1209"usage: mount_nfs [-23bcdiLlNPsTU] [-a maxreadahead] [-D deadthresh]",
1210"                 [-g maxgroups] [-I readdirsize] [-o options] [-R retrycnt]",
1211"                 [-r readsize] [-t timeout] [-w writesize] [-x retrans]",
1212"                 rhost:path node");
1213	exit(1);
1214}
1215