1 /* 2 * Copyright (c) 1980, 1988, 1993 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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 #if 0 36 static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93"; 37 #else 38 static char rcsid[] = 39 "$FreeBSD$"; 40 #endif 41 #endif /* LIBC_SCCS and not lint */ 42 43 #include "namespace.h" 44 #include <sys/param.h> 45 #include <sys/mount.h> 46 #include <sys/stat.h> 47 48 #include <errno.h> 49 #include <fstab.h> 50 #include <paths.h> 51 #include <stdio.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 #include "un-namespace.h" 56 57 static FILE *_fs_fp; 58 static struct fstab _fs_fstab; 59 static int LineNo = 0; 60 61 static void error __P((int)); 62 static void fixfsfile __P((void)); 63 static int fstabscan __P((void)); 64 65 static void 66 fixfsfile() 67 { 68 static char buf[sizeof(_PATH_DEV) + MNAMELEN]; 69 struct stat sb; 70 struct statfs sf; 71 72 if (strcmp(_fs_fstab.fs_file, "/") != 0) 73 return; 74 if (statfs("/", &sf) != 0) 75 return; 76 if (sf.f_mntfromname[0] == '/') 77 buf[0] = '\0'; 78 else 79 strcpy(buf, _PATH_DEV); 80 strcat(buf, sf.f_mntfromname); 81 if (stat(buf, &sb) != 0 || 82 (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode))) 83 return; 84 _fs_fstab.fs_spec = buf; 85 } 86 87 static int 88 fstabscan() 89 { 90 char *cp, *p; 91 #define MAXLINELENGTH 1024 92 static char line[MAXLINELENGTH]; 93 char subline[MAXLINELENGTH]; 94 int typexx; 95 96 for (;;) { 97 98 if (!(p = fgets(line, sizeof(line), _fs_fp))) 99 return(0); 100 /* OLD_STYLE_FSTAB */ 101 ++LineNo; 102 if (*line == '#' || *line == '\n') 103 continue; 104 if (!strpbrk(p, " \t")) { 105 _fs_fstab.fs_spec = strsep(&p, ":\n"); 106 _fs_fstab.fs_file = strsep(&p, ":\n"); 107 fixfsfile(); 108 _fs_fstab.fs_type = strsep(&p, ":\n"); 109 if (_fs_fstab.fs_type) { 110 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX)) 111 continue; 112 _fs_fstab.fs_mntops = _fs_fstab.fs_type; 113 _fs_fstab.fs_vfstype = 114 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 115 "ufs" : "swap"; 116 if ((cp = strsep(&p, ":\n")) != NULL) { 117 _fs_fstab.fs_freq = atoi(cp); 118 if ((cp = strsep(&p, ":\n")) != NULL) { 119 _fs_fstab.fs_passno = atoi(cp); 120 return(1); 121 } 122 } 123 } 124 goto bad; 125 } 126 /* OLD_STYLE_FSTAB */ 127 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 128 ; 129 _fs_fstab.fs_spec = cp; 130 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 131 continue; 132 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 133 ; 134 _fs_fstab.fs_file = cp; 135 fixfsfile(); 136 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 137 ; 138 _fs_fstab.fs_vfstype = cp; 139 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 140 ; 141 _fs_fstab.fs_mntops = cp; 142 if (_fs_fstab.fs_mntops == NULL) 143 goto bad; 144 _fs_fstab.fs_freq = 0; 145 _fs_fstab.fs_passno = 0; 146 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 147 ; 148 if (cp != NULL) { 149 _fs_fstab.fs_freq = atoi(cp); 150 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 151 ; 152 if (cp != NULL) 153 _fs_fstab.fs_passno = atoi(cp); 154 } 155 strcpy(subline, _fs_fstab.fs_mntops); 156 p = subline; 157 for (typexx = 0, cp = strsep(&p, ","); cp; 158 cp = strsep(&p, ",")) { 159 if (strlen(cp) != 2) 160 continue; 161 if (!strcmp(cp, FSTAB_RW)) { 162 _fs_fstab.fs_type = FSTAB_RW; 163 break; 164 } 165 if (!strcmp(cp, FSTAB_RQ)) { 166 _fs_fstab.fs_type = FSTAB_RQ; 167 break; 168 } 169 if (!strcmp(cp, FSTAB_RO)) { 170 _fs_fstab.fs_type = FSTAB_RO; 171 break; 172 } 173 if (!strcmp(cp, FSTAB_SW)) { 174 _fs_fstab.fs_type = FSTAB_SW; 175 break; 176 } 177 if (!strcmp(cp, FSTAB_XX)) { 178 _fs_fstab.fs_type = FSTAB_XX; 179 typexx++; 180 break; 181 } 182 } 183 if (typexx) 184 continue; 185 if (cp != NULL) 186 return(1); 187 188 bad: /* no way to distinguish between EOF and syntax error */ 189 error(EFTYPE); 190 } 191 /* NOTREACHED */ 192 } 193 194 struct fstab * 195 getfsent() 196 { 197 if ((!_fs_fp && !setfsent()) || !fstabscan()) 198 return((struct fstab *)NULL); 199 return(&_fs_fstab); 200 } 201 202 struct fstab * 203 getfsspec(name) 204 register const char *name; 205 { 206 if (setfsent()) 207 while (fstabscan()) 208 if (!strcmp(_fs_fstab.fs_spec, name)) 209 return(&_fs_fstab); 210 return((struct fstab *)NULL); 211 } 212 213 struct fstab * 214 getfsfile(name) 215 register const char *name; 216 { 217 if (setfsent()) 218 while (fstabscan()) 219 if (!strcmp(_fs_fstab.fs_file, name)) 220 return(&_fs_fstab); 221 return((struct fstab *)NULL); 222 } 223 224 int 225 setfsent() 226 { 227 if (_fs_fp) { 228 rewind(_fs_fp); 229 LineNo = 0; 230 return(1); 231 } 232 if ((_fs_fp = fopen(_PATH_FSTAB, "r")) != NULL) { 233 LineNo = 0; 234 return(1); 235 } 236 error(errno); 237 return(0); 238 } 239 240 void 241 endfsent() 242 { 243 if (_fs_fp) { 244 (void)fclose(_fs_fp); 245 _fs_fp = NULL; 246 } 247 } 248 249 static void 250 error(err) 251 int err; 252 { 253 char *p; 254 char num[30]; 255 256 (void)_write(STDERR_FILENO, "fstab: ", 7); 257 (void)_write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1); 258 (void)_write(STDERR_FILENO, ":", 1); 259 sprintf(num, "%d: ", LineNo); 260 (void)_write(STDERR_FILENO, num, strlen(num)); 261 p = strerror(err); 262 (void)_write(STDERR_FILENO, p, strlen(p)); 263 (void)_write(STDERR_FILENO, "\n", 1); 264 } 265