1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #if 0 33 #ifndef lint 34 static char sccsid[] = "@(#)getmntopts.c 8.3 (Berkeley) 3/29/95"; 35 #endif /* not lint */ 36 #endif 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/mount.h> 42 #include <sys/stat.h> 43 #include <sys/uio.h> 44 45 #include <err.h> 46 #include <errno.h> 47 #include <stdarg.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 52 #include "mntopts.h" 53 54 int getmnt_silent = 0; 55 56 void 57 getmntopts(const char *options, const struct mntopt *m0, int *flagp, 58 int *altflagp) 59 { 60 const struct mntopt *m; 61 int negative, len; 62 char *opt, *optbuf, *p; 63 int *thisflagp; 64 65 /* Copy option string, since it is about to be torn asunder... */ 66 if ((optbuf = strdup(options)) == NULL) 67 err(1, NULL); 68 69 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 70 /* Check for "no" prefix. */ 71 if (opt[0] == 'n' && opt[1] == 'o') { 72 negative = 1; 73 opt += 2; 74 } else 75 negative = 0; 76 77 /* 78 * for options with assignments in them (ie. quotas) 79 * ignore the assignment as it's handled elsewhere 80 */ 81 p = strchr(opt, '='); 82 if (p != NULL) 83 *++p = '\0'; 84 85 /* Scan option table. */ 86 for (m = m0; m->m_option != NULL; ++m) { 87 len = strlen(m->m_option); 88 if (strncasecmp(opt, m->m_option, len) == 0) 89 if (opt[len] == '\0' || opt[len] == '=') 90 break; 91 } 92 93 /* Save flag, or fail if option is not recognized. */ 94 if (m->m_option) { 95 thisflagp = m->m_altloc ? altflagp : flagp; 96 if (negative == m->m_inverse) 97 *thisflagp |= m->m_flag; 98 else 99 *thisflagp &= ~m->m_flag; 100 } else if (!getmnt_silent) { 101 errx(1, "-o %s: option not supported", opt); 102 } 103 } 104 105 free(optbuf); 106 } 107 108 void 109 rmslashes(char *rrpin, char *rrpout) 110 { 111 char *rrpoutstart; 112 113 *rrpout = *rrpin; 114 for (rrpoutstart = rrpout; *rrpin != '\0'; *rrpout++ = *rrpin++) { 115 116 /* skip all double slashes */ 117 while (*rrpin == '/' && *(rrpin + 1) == '/') 118 rrpin++; 119 } 120 121 /* remove trailing slash if necessary */ 122 if (rrpout - rrpoutstart > 1 && *(rrpout - 1) == '/') 123 *(rrpout - 1) = '\0'; 124 else 125 *rrpout = '\0'; 126 } 127 128 int 129 checkpath(const char *path, char *resolved) 130 { 131 struct stat sb; 132 133 if (realpath(path, resolved) == NULL || stat(resolved, &sb) != 0) 134 return (1); 135 if (!S_ISDIR(sb.st_mode)) { 136 errno = ENOTDIR; 137 return (1); 138 } 139 return (0); 140 } 141 142 void 143 build_iovec(struct iovec **iov, int *iovlen, const char *name, void *val, 144 size_t len) 145 { 146 int i; 147 148 if (*iovlen < 0) 149 return; 150 i = *iovlen; 151 *iov = realloc(*iov, sizeof **iov * (i + 2)); 152 if (*iov == NULL) { 153 *iovlen = -1; 154 return; 155 } 156 (*iov)[i].iov_base = strdup(name); 157 (*iov)[i].iov_len = strlen(name) + 1; 158 i++; 159 (*iov)[i].iov_base = val; 160 if (len == (size_t)-1) { 161 if (val != NULL) 162 len = strlen(val) + 1; 163 else 164 len = 0; 165 } 166 (*iov)[i].iov_len = (int)len; 167 *iovlen = ++i; 168 } 169 170 /* 171 * This function is needed for compatibility with parameters 172 * which used to use the mount_argf() command for the old mount() syscall. 173 */ 174 void 175 build_iovec_argf(struct iovec **iov, int *iovlen, const char *name, 176 const char *fmt, ...) 177 { 178 va_list ap; 179 char val[255] = { 0 }; 180 181 va_start(ap, fmt); 182 vsnprintf(val, sizeof(val), fmt, ap); 183 va_end(ap); 184 build_iovec(iov, iovlen, name, strdup(val), (size_t)-1); 185 } 186 187 /* 188 * Free the iovec and reset to NULL with zero length. Useful for calling 189 * nmount in a loop. 190 */ 191 void 192 free_iovec(struct iovec **iov, int *iovlen) 193 { 194 int i; 195 196 for (i = 0; i < *iovlen; i++) 197 free((*iov)[i].iov_base); 198 free(*iov); 199 } 200