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("$FreeBSD$");
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, "wcommitsize", &opt, NULL) == 0) {
616		ret = sscanf(opt, "%d", &args.wcommitsize);
617		if (ret != 1 || args.wcommitsize < 0) {
618			errx(1, "illegal wcommitsize: %s", opt);
619		}
620		args.flags |= NFSMNT_WCOMMITSIZE;
621	}
622	if (findopt(iov, iovlen, "deadthresh", &opt, NULL) == 0) {
623		ret = sscanf(opt, "%d", &args.deadthresh);
624		if (ret != 1 || args.deadthresh <= 0) {
625			errx(1, "illegal deadthresh: %s", opt);
626		}
627		args.flags |= NFSMNT_DEADTHRESH;
628	}
629	if (findopt(iov, iovlen, "timeout", &opt, NULL) == 0) {
630		ret = sscanf(opt, "%d", &args.timeo);
631		if (ret != 1 || args.timeo <= 0) {
632			errx(1, "illegal timeout: %s", opt);
633		}
634		args.flags |= NFSMNT_TIMEO;
635	}
636	if (findopt(iov, iovlen, "maxgroups", &opt, NULL) == 0) {
637		ret = sscanf(opt, "%d", &args.maxgrouplist);
638		if (ret != 1 || args.timeo <= 0) {
639			errx(1, "illegal maxgroups: %s", opt);
640		}
641		args.flags |= NFSMNT_MAXGRPS;
642	}
643	if (findopt(iov, iovlen, "addr", &opt,
644		&args.addrlen) == 0) {
645		args.addr = (struct sockaddr *) opt;
646	}
647	if (findopt(iov, iovlen, "fh", &opt, &args.fhsize) == 0) {
648		args.fh = opt;
649	}
650	if (findopt(iov, iovlen, "hostname", &args.hostname,
651		NULL) == 0) {
652	}
653	if (args.hostname == NULL) {
654		errx(1, "Invalid hostname");
655	}
656
657	newiov = NULL;
658	newiovlen = 0;
659
660	build_iovec(&newiov, &newiovlen, "nfs_args", &args, sizeof(args));
661	copyopt(&newiov, &newiovlen, iov, iovlen, "fstype");
662	copyopt(&newiov, &newiovlen, iov, iovlen, "fspath");
663	copyopt(&newiov, &newiovlen, iov, iovlen, "errmsg");
664
665	return nmount(newiov, newiovlen, mntflags);
666}
667
668static int
669sec_name_to_num(char *sec)
670{
671	if (!strcmp(sec, "krb5"))
672		return (RPCSEC_GSS_KRB5);
673	if (!strcmp(sec, "krb5i"))
674		return (RPCSEC_GSS_KRB5I);
675	if (!strcmp(sec, "krb5p"))
676		return (RPCSEC_GSS_KRB5P);
677	if (!strcmp(sec, "sys"))
678		return (AUTH_SYS);
679	return (-1);
680}
681
682static char *
683sec_num_to_name(int flavor)
684{
685	switch (flavor) {
686	case RPCSEC_GSS_KRB5:
687		return ("krb5");
688	case RPCSEC_GSS_KRB5I:
689		return ("krb5i");
690	case RPCSEC_GSS_KRB5P:
691		return ("krb5p");
692	case AUTH_SYS:
693		return ("sys");
694	}
695	return (NULL);
696}
697
698static int
699getnfsargs(char *spec, struct iovec **iov, int *iovlen)
700{
701	struct addrinfo hints, *ai_nfs, *ai;
702	enum tryret ret;
703	int ecode, speclen, remoteerr, offset, have_bracket = 0;
704	char *hostp, *delimp, *errstr;
705	size_t len;
706	static char nam[MNAMELEN + 1], pname[MAXHOSTNAMELEN + 5];
707
708	if (*spec == '[' && (delimp = strchr(spec + 1, ']')) != NULL &&
709	    *(delimp + 1) == ':') {
710		hostp = spec + 1;
711		spec = delimp + 2;
712		have_bracket = 1;
713	} else if ((delimp = strrchr(spec, ':')) != NULL) {
714		hostp = spec;
715		spec = delimp + 1;
716	} else if ((delimp = strrchr(spec, '@')) != NULL) {
717		warnx("path@server syntax is deprecated, use server:path");
718		hostp = delimp + 1;
719	} else {
720		warnx("no <host>:<dirpath> nfs-name");
721		return (0);
722	}
723	*delimp = '\0';
724
725	/*
726	 * If there has been a trailing slash at mounttime it seems
727	 * that some mountd implementations fail to remove the mount
728	 * entries from their mountlist while unmounting.
729	 */
730	for (speclen = strlen(spec);
731		speclen > 1 && spec[speclen - 1] == '/';
732		speclen--)
733		spec[speclen - 1] = '\0';
734	if (strlen(hostp) + strlen(spec) + 1 > MNAMELEN) {
735		warnx("%s:%s: %s", hostp, spec, strerror(ENAMETOOLONG));
736		return (0);
737	}
738	/* Make both '@' and ':' notations equal */
739	if (*hostp != '\0') {
740		len = strlen(hostp);
741		offset = 0;
742		if (have_bracket)
743			nam[offset++] = '[';
744		memmove(nam + offset, hostp, len);
745		if (have_bracket)
746			nam[len + offset++] = ']';
747		nam[len + offset++] = ':';
748		memmove(nam + len + offset, spec, speclen);
749		nam[len + speclen + offset] = '\0';
750	}
751
752	/*
753	 * Handle an internet host address.
754	 */
755	memset(&hints, 0, sizeof hints);
756	hints.ai_flags = AI_NUMERICHOST;
757	if (nfsproto == IPPROTO_TCP)
758		hints.ai_socktype = SOCK_STREAM;
759	else if (nfsproto == IPPROTO_UDP)
760		hints.ai_socktype = SOCK_DGRAM;
761
762	if (getaddrinfo(hostp, portspec, &hints, &ai_nfs) != 0) {
763		hints.ai_flags = AI_CANONNAME;
764		if ((ecode = getaddrinfo(hostp, portspec, &hints, &ai_nfs))
765		    != 0) {
766			if (portspec == NULL)
767				errx(1, "%s: %s", hostp, gai_strerror(ecode));
768			else
769				errx(1, "%s:%s: %s", hostp, portspec,
770				    gai_strerror(ecode));
771			return (0);
772		}
773
774		/*
775		 * For a Kerberized nfs mount where the "principal"
776		 * argument has not been set, add it here.
777		 */
778		if (got_principal == 0 && secflavor >= 0 &&
779		    secflavor != AUTH_SYS && ai_nfs->ai_canonname != NULL) {
780			snprintf(pname, sizeof (pname), "nfs@%s",
781			    ai_nfs->ai_canonname);
782			build_iovec(iov, iovlen, "principal", pname,
783			    strlen(pname) + 1);
784		}
785	}
786
787	ret = TRYRET_LOCALERR;
788	for (;;) {
789		/*
790		 * Try each entry returned by getaddrinfo(). Note the
791		 * occurence of remote errors by setting `remoteerr'.
792		 */
793		remoteerr = 0;
794		for (ai = ai_nfs; ai != NULL; ai = ai->ai_next) {
795			if ((ai->ai_family == AF_INET6) &&
796			    (opflags & OF_NOINET6))
797				continue;
798			if ((ai->ai_family == AF_INET) &&
799			    (opflags & OF_NOINET4))
800				continue;
801			ret = nfs_tryproto(ai, hostp, spec, &errstr, iov,
802			    iovlen);
803			if (ret == TRYRET_SUCCESS)
804				break;
805			if (ret != TRYRET_LOCALERR)
806				remoteerr = 1;
807			if ((opflags & ISBGRND) == 0)
808				fprintf(stderr, "%s\n", errstr);
809		}
810		if (ret == TRYRET_SUCCESS)
811			break;
812
813		/* Exit if all errors were local. */
814		if (!remoteerr)
815			exit(1);
816
817		/*
818		 * If retrycnt == 0, we are to keep retrying forever.
819		 * Otherwise decrement it, and exit if it hits zero.
820		 */
821		if (retrycnt != 0 && --retrycnt == 0)
822			exit(1);
823
824		if ((opflags & (BGRND | ISBGRND)) == BGRND) {
825			warnx("Cannot immediately mount %s:%s, backgrounding",
826			    hostp, spec);
827			opflags |= ISBGRND;
828			if (daemon(0, 0) != 0)
829				err(1, "daemon");
830		}
831		sleep(60);
832	}
833	freeaddrinfo(ai_nfs);
834
835	build_iovec(iov, iovlen, "hostname", nam, (size_t)-1);
836	/* Add mounted file system to PATH_MOUNTTAB */
837	if (!add_mtab(hostp, spec))
838		warnx("can't update %s for %s:%s", PATH_MOUNTTAB, hostp, spec);
839	return (1);
840}
841
842/*
843 * Try to set up the NFS arguments according to the address
844 * family, protocol (and possibly port) specified in `ai'.
845 *
846 * Returns TRYRET_SUCCESS if successful, or:
847 *   TRYRET_TIMEOUT		The server did not respond.
848 *   TRYRET_REMOTEERR		The server reported an error.
849 *   TRYRET_LOCALERR		Local failure.
850 *
851 * In all error cases, *errstr will be set to a statically-allocated string
852 * describing the error.
853 */
854static enum tryret
855nfs_tryproto(struct addrinfo *ai, char *hostp, char *spec, char **errstr,
856    struct iovec **iov, int *iovlen)
857{
858	static char errbuf[256];
859	struct sockaddr_storage nfs_ss;
860	struct netbuf nfs_nb;
861	struct nfhret nfhret;
862	struct timeval try;
863	struct rpc_err rpcerr;
864	CLIENT *clp;
865	struct netconfig *nconf, *nconf_mnt;
866	const char *netid, *netid_mnt;
867	char *secname;
868	int doconnect, nfsvers, mntvers, sotype;
869	enum clnt_stat stat;
870	enum mountmode trymntmode;
871
872	sotype = 0;
873	trymntmode = mountmode;
874	errbuf[0] = '\0';
875	*errstr = errbuf;
876
877	if (nfsproto == IPPROTO_TCP)
878		sotype = SOCK_STREAM;
879	else if (nfsproto == IPPROTO_UDP)
880		sotype = SOCK_DGRAM;
881
882	if ((netid = netidbytype(ai->ai_family, sotype)) == NULL) {
883		snprintf(errbuf, sizeof errbuf,
884		    "af %d sotype %d not supported", ai->ai_family, sotype);
885		return (TRYRET_LOCALERR);
886	}
887	if ((nconf = getnetconf_cached(netid)) == NULL) {
888		snprintf(errbuf, sizeof errbuf, "%s: %s", netid, nc_sperror());
889		return (TRYRET_LOCALERR);
890	}
891	/* The RPCPROG_MNT netid may be different. */
892	if (mnttcp_ok) {
893		netid_mnt = netid;
894		nconf_mnt = nconf;
895	} else {
896		if ((netid_mnt = netidbytype(ai->ai_family, SOCK_DGRAM))
897		     == NULL) {
898			snprintf(errbuf, sizeof errbuf,
899			    "af %d sotype SOCK_DGRAM not supported",
900			     ai->ai_family);
901			return (TRYRET_LOCALERR);
902		}
903		if ((nconf_mnt = getnetconf_cached(netid_mnt)) == NULL) {
904			snprintf(errbuf, sizeof errbuf, "%s: %s", netid_mnt,
905			    nc_sperror());
906			return (TRYRET_LOCALERR);
907		}
908	}
909
910tryagain:
911	if (trymntmode == V4) {
912		nfsvers = 4;
913	} else if (trymntmode == V2) {
914		nfsvers = 2;
915		mntvers = 1;
916	} else {
917		nfsvers = 3;
918		mntvers = 3;
919	}
920
921	if (portspec != NULL) {
922		/* `ai' contains the complete nfsd sockaddr. */
923		nfs_nb.buf = ai->ai_addr;
924		nfs_nb.len = nfs_nb.maxlen = ai->ai_addrlen;
925	} else {
926		/* Ask the remote rpcbind. */
927		nfs_nb.buf = &nfs_ss;
928		nfs_nb.len = nfs_nb.maxlen = sizeof nfs_ss;
929
930		if (!rpcb_getaddr(NFS_PROGRAM, nfsvers, nconf, &nfs_nb,
931		    hostp)) {
932			if (rpc_createerr.cf_stat == RPC_PROGVERSMISMATCH &&
933			    trymntmode == ANY) {
934				trymntmode = V2;
935				goto tryagain;
936			}
937			snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s",
938			    netid, hostp, spec,
939			    clnt_spcreateerror("RPCPROG_NFS"));
940			return (returncode(rpc_createerr.cf_stat,
941			    &rpc_createerr.cf_error));
942		}
943	}
944
945	/* Check that the server (nfsd) responds on the port we have chosen. */
946	clp = clnt_tli_create(RPC_ANYFD, nconf, &nfs_nb, NFS_PROGRAM, nfsvers,
947	    0, 0);
948	if (clp == NULL) {
949		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
950		    hostp, spec, clnt_spcreateerror("nfsd: RPCPROG_NFS"));
951		return (returncode(rpc_createerr.cf_stat,
952		    &rpc_createerr.cf_error));
953	}
954	if (sotype == SOCK_DGRAM && noconn == 0) {
955		/*
956		 * Use connect(), to match what the kernel does. This
957		 * catches cases where the server responds from the
958		 * wrong source address.
959		 */
960		doconnect = 1;
961		if (!clnt_control(clp, CLSET_CONNECT, (char *)&doconnect)) {
962			clnt_destroy(clp);
963			snprintf(errbuf, sizeof errbuf,
964			    "[%s] %s:%s: CLSET_CONNECT failed", netid, hostp,
965			    spec);
966			return (TRYRET_LOCALERR);
967		}
968	}
969
970	try.tv_sec = 10;
971	try.tv_usec = 0;
972	stat = clnt_call(clp, NFSPROC_NULL, (xdrproc_t)xdr_void, NULL,
973			 (xdrproc_t)xdr_void, NULL, try);
974	if (stat != RPC_SUCCESS) {
975		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
976			clnt_destroy(clp);
977			trymntmode = V2;
978			goto tryagain;
979		}
980		clnt_geterr(clp, &rpcerr);
981		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid,
982		    hostp, spec, clnt_sperror(clp, "NFSPROC_NULL"));
983		clnt_destroy(clp);
984		return (returncode(stat, &rpcerr));
985	}
986	clnt_destroy(clp);
987
988	/*
989	 * For NFSv4, there is no mount protocol.
990	 */
991	if (trymntmode == V4) {
992		/*
993		 * Store the server address in nfsargsp, making
994		 * sure to copy any locally allocated structures.
995		 */
996		addrlen = nfs_nb.len;
997		addr = malloc(addrlen);
998		if (addr == NULL)
999			err(1, "malloc");
1000		bcopy(nfs_nb.buf, addr, addrlen);
1001
1002		build_iovec(iov, iovlen, "addr", addr, addrlen);
1003		secname = sec_num_to_name(secflavor);
1004		if (secname != NULL)
1005			build_iovec(iov, iovlen, "sec", secname, (size_t)-1);
1006		build_iovec(iov, iovlen, "nfsv4", NULL, 0);
1007		build_iovec(iov, iovlen, "dirpath", spec, (size_t)-1);
1008
1009		return (TRYRET_SUCCESS);
1010	}
1011
1012	/* Send the MOUNTPROC_MNT RPC to get the root filehandle. */
1013	try.tv_sec = 10;
1014	try.tv_usec = 0;
1015	clp = clnt_tp_create(hostp, MOUNTPROG, mntvers, nconf_mnt);
1016	if (clp == NULL) {
1017		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
1018		    hostp, spec, clnt_spcreateerror("RPCMNT: clnt_create"));
1019		return (returncode(rpc_createerr.cf_stat,
1020		    &rpc_createerr.cf_error));
1021	}
1022	clp->cl_auth = authsys_create_default();
1023	nfhret.auth = secflavor;
1024	nfhret.vers = mntvers;
1025	stat = clnt_call(clp, MOUNTPROC_MNT, (xdrproc_t)xdr_dir, spec,
1026			 (xdrproc_t)xdr_fh, &nfhret,
1027	    try);
1028	auth_destroy(clp->cl_auth);
1029	if (stat != RPC_SUCCESS) {
1030		if (stat == RPC_PROGVERSMISMATCH && trymntmode == ANY) {
1031			clnt_destroy(clp);
1032			trymntmode = V2;
1033			goto tryagain;
1034		}
1035		clnt_geterr(clp, &rpcerr);
1036		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
1037		    hostp, spec, clnt_sperror(clp, "RPCPROG_MNT"));
1038		clnt_destroy(clp);
1039		return (returncode(stat, &rpcerr));
1040	}
1041	clnt_destroy(clp);
1042
1043	if (nfhret.stat != 0) {
1044		snprintf(errbuf, sizeof errbuf, "[%s] %s:%s: %s", netid_mnt,
1045		    hostp, spec, strerror(nfhret.stat));
1046		return (TRYRET_REMOTEERR);
1047	}
1048
1049	/*
1050	 * Store the filehandle and server address in nfsargsp, making
1051	 * sure to copy any locally allocated structures.
1052	 */
1053	addrlen = nfs_nb.len;
1054	addr = malloc(addrlen);
1055	fhsize = nfhret.fhsize;
1056	fh = malloc(fhsize);
1057	if (addr == NULL || fh == NULL)
1058		err(1, "malloc");
1059	bcopy(nfs_nb.buf, addr, addrlen);
1060	bcopy(nfhret.nfh, fh, fhsize);
1061
1062	build_iovec(iov, iovlen, "addr", addr, addrlen);
1063	build_iovec(iov, iovlen, "fh", fh, fhsize);
1064	secname = sec_num_to_name(nfhret.auth);
1065	if (secname)
1066		build_iovec(iov, iovlen, "sec", secname, (size_t)-1);
1067	if (nfsvers == 3)
1068		build_iovec(iov, iovlen, "nfsv3", NULL, 0);
1069
1070	return (TRYRET_SUCCESS);
1071}
1072
1073/*
1074 * Catagorise a RPC return status and error into an `enum tryret'
1075 * return code.
1076 */
1077static enum tryret
1078returncode(enum clnt_stat stat, struct rpc_err *rpcerr)
1079{
1080	switch (stat) {
1081	case RPC_TIMEDOUT:
1082		return (TRYRET_TIMEOUT);
1083	case RPC_PMAPFAILURE:
1084	case RPC_PROGNOTREGISTERED:
1085	case RPC_PROGVERSMISMATCH:
1086	/* XXX, these can be local or remote. */
1087	case RPC_CANTSEND:
1088	case RPC_CANTRECV:
1089		return (TRYRET_REMOTEERR);
1090	case RPC_SYSTEMERROR:
1091		switch (rpcerr->re_errno) {
1092		case ETIMEDOUT:
1093			return (TRYRET_TIMEOUT);
1094		case ENOMEM:
1095			break;
1096		default:
1097			return (TRYRET_REMOTEERR);
1098		}
1099		/* FALLTHROUGH */
1100	default:
1101		break;
1102	}
1103	return (TRYRET_LOCALERR);
1104}
1105
1106/*
1107 * Look up a netid based on an address family and socket type.
1108 * `af' is the address family, and `sotype' is SOCK_DGRAM or SOCK_STREAM.
1109 *
1110 * XXX there should be a library function for this.
1111 */
1112static const char *
1113netidbytype(int af, int sotype)
1114{
1115	struct nc_protos *p;
1116
1117	for (p = nc_protos; p->netid != NULL; p++) {
1118		if (af != p->af || sotype != p->sotype)
1119			continue;
1120		return (p->netid);
1121	}
1122	return (NULL);
1123}
1124
1125/*
1126 * Look up a netconfig entry based on a netid, and cache the result so
1127 * that we don't need to remember to call freenetconfigent().
1128 *
1129 * Otherwise it behaves just like getnetconfigent(), so nc_*error()
1130 * work on failure.
1131 */
1132static struct netconfig *
1133getnetconf_cached(const char *netid)
1134{
1135	static struct nc_entry {
1136		struct netconfig *nconf;
1137		struct nc_entry *next;
1138	} *head;
1139	struct nc_entry *p;
1140	struct netconfig *nconf;
1141
1142	for (p = head; p != NULL; p = p->next)
1143		if (strcmp(netid, p->nconf->nc_netid) == 0)
1144			return (p->nconf);
1145
1146	if ((nconf = getnetconfigent(netid)) == NULL)
1147		return (NULL);
1148	if ((p = malloc(sizeof(*p))) == NULL)
1149		err(1, "malloc");
1150	p->nconf = nconf;
1151	p->next = head;
1152	head = p;
1153
1154	return (p->nconf);
1155}
1156
1157/*
1158 * xdr routines for mount rpc's
1159 */
1160static int
1161xdr_dir(XDR *xdrsp, char *dirp)
1162{
1163	return (xdr_string(xdrsp, &dirp, MNTPATHLEN));
1164}
1165
1166static int
1167xdr_fh(XDR *xdrsp, struct nfhret *np)
1168{
1169	int i;
1170	long auth, authcnt, authfnd = 0;
1171
1172	if (!xdr_u_long(xdrsp, &np->stat))
1173		return (0);
1174	if (np->stat)
1175		return (1);
1176	switch (np->vers) {
1177	case 1:
1178		np->fhsize = NFS_FHSIZE;
1179		return (xdr_opaque(xdrsp, (caddr_t)np->nfh, NFS_FHSIZE));
1180	case 3:
1181		if (!xdr_long(xdrsp, &np->fhsize))
1182			return (0);
1183		if (np->fhsize <= 0 || np->fhsize > NFS3_FHSIZE)
1184			return (0);
1185		if (!xdr_opaque(xdrsp, (caddr_t)np->nfh, np->fhsize))
1186			return (0);
1187		if (!xdr_long(xdrsp, &authcnt))
1188			return (0);
1189		for (i = 0; i < authcnt; i++) {
1190			if (!xdr_long(xdrsp, &auth))
1191				return (0);
1192			if (np->auth == -1) {
1193				np->auth = auth;
1194				authfnd++;
1195			} else if (auth == np->auth) {
1196				authfnd++;
1197			}
1198		}
1199		/*
1200		 * Some servers, such as DEC's OSF/1 return a nil authenticator
1201		 * list to indicate RPCAUTH_UNIX.
1202		 */
1203		if (authcnt == 0 && np->auth == -1)
1204			np->auth = AUTH_SYS;
1205		if (!authfnd && (authcnt > 0 || np->auth != AUTH_SYS))
1206			np->stat = EAUTH;
1207		return (1);
1208	};
1209	return (0);
1210}
1211
1212static void
1213usage(void)
1214{
1215	(void)fprintf(stderr, "%s\n%s\n%s\n%s\n",
1216"usage: mount_nfs [-23bcdiLlNPsTU] [-a maxreadahead] [-D deadthresh]",
1217"                 [-g maxgroups] [-I readdirsize] [-o options] [-R retrycnt]",
1218"                 [-r readsize] [-t timeout] [-w writesize] [-x retrans]",
1219"                 rhost:path node");
1220	exit(1);
1221}
1222