getmntopts.c revision 230226
1/*- 2 * Copyright (c) 1994 3 * The Regents of the University of California. 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 * 4. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30#if 0 31#ifndef lint 32static char sccsid[] = "@(#)getmntopts.c 8.3 (Berkeley) 3/29/95"; 33#endif /* not lint */ 34#endif 35#include <sys/cdefs.h> 36__FBSDID("$FreeBSD: head/sbin/mount/getmntopts.c 230226 2012-01-16 19:34:21Z jh $"); 37 38#include <sys/param.h> 39#include <sys/mount.h> 40#include <sys/stat.h> 41#include <sys/uio.h> 42 43#include <err.h> 44#include <errno.h> 45#include <stdarg.h> 46#include <stdio.h> 47#include <stdlib.h> 48#include <string.h> 49#include <sysexits.h> 50 51#include "mntopts.h" 52 53int getmnt_silent = 0; 54 55void 56getmntopts(const char *options, const struct mntopt *m0, int *flagp, 57 int *altflagp) 58{ 59 const struct mntopt *m; 60 int negative, len; 61 char *opt, *optbuf, *p; 62 int *thisflagp; 63 64 /* Copy option string, since it is about to be torn asunder... */ 65 if ((optbuf = strdup(options)) == NULL) 66 err(1, NULL); 67 68 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 69 /* Check for "no" prefix. */ 70 if (opt[0] == 'n' && opt[1] == 'o') { 71 negative = 1; 72 opt += 2; 73 } else 74 negative = 0; 75 76 /* 77 * for options with assignments in them (ie. quotas) 78 * ignore the assignment as it's handled elsewhere 79 */ 80 p = strchr(opt, '='); 81 if (p != NULL) 82 *++p = '\0'; 83 84 /* Scan option table. */ 85 for (m = m0; m->m_option != NULL; ++m) { 86 len = strlen(m->m_option); 87 if (strncasecmp(opt, m->m_option, len) == 0) 88 if (opt[len] == '\0' || opt[len] == '=') 89 break; 90 } 91 92 /* Save flag, or fail if option is not recognized. */ 93 if (m->m_option) { 94 thisflagp = m->m_altloc ? altflagp : flagp; 95 if (negative == m->m_inverse) 96 *thisflagp |= m->m_flag; 97 else 98 *thisflagp &= ~m->m_flag; 99 } else if (!getmnt_silent) { 100 errx(1, "-o %s: option not supported", opt); 101 } 102 } 103 104 free(optbuf); 105} 106 107void 108rmslashes(char *rrpin, char *rrpout) 109{ 110 char *rrpoutstart; 111 112 *rrpout = *rrpin; 113 for (rrpoutstart = rrpout; *rrpin != '\0'; *rrpout++ = *rrpin++) { 114 115 /* skip all double slashes */ 116 while (*rrpin == '/' && *(rrpin + 1) == '/') 117 rrpin++; 118 } 119 120 /* remove trailing slash if necessary */ 121 if (rrpout - rrpoutstart > 1 && *(rrpout - 1) == '/') 122 *(rrpout - 1) = '\0'; 123 else 124 *rrpout = '\0'; 125} 126 127int 128checkpath(const char *path, char *resolved) 129{ 130 struct stat sb; 131 132 if (realpath(path, resolved) != NULL && stat(resolved, &sb) == 0) { 133 if (!S_ISDIR(sb.st_mode)) { 134 errno = ENOTDIR; 135 return (1); 136 } 137 } else 138 return (1); 139 140 return (0); 141} 142 143void 144build_iovec(struct iovec **iov, int *iovlen, const char *name, void *val, 145 size_t len) 146{ 147 int i; 148 149 if (*iovlen < 0) 150 return; 151 i = *iovlen; 152 *iov = realloc(*iov, sizeof **iov * (i + 2)); 153 if (*iov == NULL) { 154 *iovlen = -1; 155 return; 156 } 157 (*iov)[i].iov_base = strdup(name); 158 (*iov)[i].iov_len = strlen(name) + 1; 159 i++; 160 (*iov)[i].iov_base = val; 161 if (len == (size_t)-1) { 162 if (val != NULL) 163 len = strlen(val) + 1; 164 else 165 len = 0; 166 } 167 (*iov)[i].iov_len = (int)len; 168 *iovlen = ++i; 169} 170 171/* 172 * This function is needed for compatibility with parameters 173 * which used to use the mount_argf() command for the old mount() syscall. 174 */ 175void 176build_iovec_argf(struct iovec **iov, int *iovlen, const char *name, 177 const char *fmt, ...) 178{ 179 va_list ap; 180 char val[255] = { 0 }; 181 182 va_start(ap, fmt); 183 vsnprintf(val, sizeof(val), fmt, ap); 184 va_end(ap); 185 build_iovec(iov, iovlen, name, strdup(val), (size_t)-1); 186} 187