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 * 3. 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 32 static char sccsid[] = "@(#)getmntopts.c 8.3 (Berkeley) 3/29/95"; 33 #endif /* not lint */ 34 #endif 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 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 50 #include "mntopts.h" 51 52 int getmnt_silent = 0; 53 54 void 55 getmntopts(const char *options, const struct mntopt *m0, int *flagp, 56 int *altflagp) 57 { 58 const struct mntopt *m; 59 int negative, len; 60 char *opt, *optbuf, *p; 61 int *thisflagp; 62 63 /* Copy option string, since it is about to be torn asunder... */ 64 if ((optbuf = strdup(options)) == NULL) 65 err(1, NULL); 66 67 for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) { 68 /* Check for "no" prefix. */ 69 if (opt[0] == 'n' && opt[1] == 'o') { 70 negative = 1; 71 opt += 2; 72 } else 73 negative = 0; 74 75 /* 76 * for options with assignments in them (ie. quotas) 77 * ignore the assignment as it's handled elsewhere 78 */ 79 p = strchr(opt, '='); 80 if (p != NULL) 81 *++p = '\0'; 82 83 /* Scan option table. */ 84 for (m = m0; m->m_option != NULL; ++m) { 85 len = strlen(m->m_option); 86 if (strncasecmp(opt, m->m_option, len) == 0) 87 if (opt[len] == '\0' || opt[len] == '=') 88 break; 89 } 90 91 /* Save flag, or fail if option is not recognized. */ 92 if (m->m_option) { 93 thisflagp = m->m_altloc ? altflagp : flagp; 94 if (negative == m->m_inverse) 95 *thisflagp |= m->m_flag; 96 else 97 *thisflagp &= ~m->m_flag; 98 } else if (!getmnt_silent) { 99 errx(1, "-o %s: option not supported", opt); 100 } 101 } 102 103 free(optbuf); 104 } 105 106 void 107 rmslashes(char *rrpin, char *rrpout) 108 { 109 char *rrpoutstart; 110 111 *rrpout = *rrpin; 112 for (rrpoutstart = rrpout; *rrpin != '\0'; *rrpout++ = *rrpin++) { 113 114 /* skip all double slashes */ 115 while (*rrpin == '/' && *(rrpin + 1) == '/') 116 rrpin++; 117 } 118 119 /* remove trailing slash if necessary */ 120 if (rrpout - rrpoutstart > 1 && *(rrpout - 1) == '/') 121 *(rrpout - 1) = '\0'; 122 else 123 *rrpout = '\0'; 124 } 125 126 int 127 checkpath(const char *path, char *resolved) 128 { 129 struct stat sb; 130 131 if (realpath(path, resolved) == NULL || stat(resolved, &sb) != 0) 132 return (1); 133 if (!S_ISDIR(sb.st_mode)) { 134 errno = ENOTDIR; 135 return (1); 136 } 137 return (0); 138 } 139 140 void 141 build_iovec(struct iovec **iov, int *iovlen, const char *name, void *val, 142 size_t len) 143 { 144 int i; 145 146 if (*iovlen < 0) 147 return; 148 i = *iovlen; 149 *iov = realloc(*iov, sizeof **iov * (i + 2)); 150 if (*iov == NULL) { 151 *iovlen = -1; 152 return; 153 } 154 (*iov)[i].iov_base = strdup(name); 155 (*iov)[i].iov_len = strlen(name) + 1; 156 i++; 157 (*iov)[i].iov_base = val; 158 if (len == (size_t)-1) { 159 if (val != NULL) 160 len = strlen(val) + 1; 161 else 162 len = 0; 163 } 164 (*iov)[i].iov_len = (int)len; 165 *iovlen = ++i; 166 } 167 168 /* 169 * This function is needed for compatibility with parameters 170 * which used to use the mount_argf() command for the old mount() syscall. 171 */ 172 void 173 build_iovec_argf(struct iovec **iov, int *iovlen, const char *name, 174 const char *fmt, ...) 175 { 176 va_list ap; 177 char val[255] = { 0 }; 178 179 va_start(ap, fmt); 180 vsnprintf(val, sizeof(val), fmt, ap); 181 va_end(ap); 182 build_iovec(iov, iovlen, name, strdup(val), (size_t)-1); 183 } 184 185 /* 186 * Free the iovec and reset to NULL with zero length. Useful for calling 187 * nmount in a loop. 188 */ 189 void 190 free_iovec(struct iovec **iov, int *iovlen) 191 { 192 int i; 193 194 for (i = 0; i < *iovlen; i++) 195 free((*iov)[i].iov_base); 196 free(*iov); 197 } 198