zmount.c revision 324061 
1/*-
2 * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27/*
28 * This file implements Solaris compatible zmount() function.
29 */
30
31#include <sys/cdefs.h>
32__FBSDID("$FreeBSD: stable/11/cddl/compat/opensolaris/misc/zmount.c 324061 2017-09-27 15:06:46Z asomers $");
33
34#include <sys/param.h>
35#include <sys/mount.h>
36#include <sys/uio.h>
37#include <sys/mntent.h>
38#include <assert.h>
39#include <stdio.h>
40#include <stdlib.h>
41#include <string.h>
42#include <mnttab.h>
43
44static void
45build_iovec(struct iovec **iov, int *iovlen, const char *name, void *val,
46    size_t len)
47{
48	int i;
49
50	if (*iovlen < 0)
51		return;
52	i = *iovlen;
53	*iov = realloc(*iov, sizeof(**iov) * (i + 2));
54	if (*iov == NULL) {
55		*iovlen = -1;
56		return;
57	}
58	(*iov)[i].iov_base = strdup(name);
59	(*iov)[i].iov_len = strlen(name) + 1;
60	i++;
61	(*iov)[i].iov_base = val;
62	if (len == (size_t)-1) {
63		if (val != NULL)
64			len = strlen(val) + 1;
65		else
66			len = 0;
67	}
68	(*iov)[i].iov_len = (int)len;
69	*iovlen = ++i;
70}
71
72int
73zmount(const char *spec, const char *dir, int mflag, char *fstype,
74    char *dataptr, int datalen, char *optptr, int optlen)
75{
76	struct iovec *iov;
77	char *optstr, *os, *p, *tofree;
78	int iovlen, rv;
79
80	assert(spec != NULL);
81	assert(dir != NULL);
82	assert(mflag == 0 || mflag == MS_RDONLY);
83	assert(fstype != NULL);
84	assert(strcmp(fstype, MNTTYPE_ZFS) == 0);
85	assert(dataptr == NULL);
86	assert(datalen == 0);
87	assert(optptr != NULL);
88	assert(optlen > 0);
89
90	tofree = optstr = strdup(optptr);
91	assert(optstr != NULL);
92
93	iov = NULL;
94	iovlen = 0;
95	if (mflag & MS_RDONLY)
96		build_iovec(&iov, &iovlen, "ro", NULL, 0);
97	build_iovec(&iov, &iovlen, "fstype", fstype, (size_t)-1);
98	build_iovec(&iov, &iovlen, "fspath", __DECONST(char *, dir),
99	    (size_t)-1);
100	build_iovec(&iov, &iovlen, "from", __DECONST(char *, spec), (size_t)-1);
101	while ((p = strsep(&optstr, ",/")) != NULL)
102		build_iovec(&iov, &iovlen, p, NULL, (size_t)-1);
103	rv = nmount(iov, iovlen, 0);
104	free(tofree);
105	return (rv);
106}
107