1 /*-
2 * Copyright (c) 2006 Pawel Jakub Dawidek <[email protected]>
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("$FreeBSD$");
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
44 static void
build_iovec(struct iovec ** iov,int * iovlen,const char * name,void * val,size_t len)45 build_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
72 int
zmount(const char * spec,const char * dir,int mflag,char * fstype,char * dataptr,int datalen,char * optptr,int optlen)73 zmount(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