zmount.c revision 256281
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/10/cddl/compat/opensolaris/misc/zmount.c 221390 2011-05-03 16:00:26Z jh $"); 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; 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 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 for (p = optstr; p != NULL; strsep(&p, ",/ ")) { 102 if (*p != '\0') 103 build_iovec(&iov, &iovlen, p, NULL, (size_t)-1); 104 } 105 rv = nmount(iov, iovlen, 0); 106 free(optstr); 107 return (rv); 108} 109