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 * $FreeBSD: src/lib/libc/gen/fstab.c,v 1.8 2000/01/27 23:06:15 jasone Exp $ 34 * $DragonFly: src/lib/libc/gen/fstab.c,v 1.5 2005/01/31 22:29:15 dillon Exp $ 35 * 36 * @(#)fstab.c 8.1 (Berkeley) 6/4/93 37 * $FreeBSD: src/lib/libc/gen/fstab.c,v 1.8 2000/01/27 23:06:15 jasone Exp $ 38 */ 39 40 #include "namespace.h" 41 #include <sys/param.h> 42 #include <sys/mount.h> 43 #include <sys/stat.h> 44 45 #include <errno.h> 46 #include <fstab.h> 47 #include <paths.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 #include <unistd.h> 52 #include "un-namespace.h" 53 54 static FILE *_fs_fp; 55 static struct fstab _fs_fstab; 56 static int LineNo = 0; 57 58 static void error (int); 59 static void fixfsfile (void); 60 static int fstabscan (void); 61 62 static void 63 fixfsfile() 64 { 65 static char buf[sizeof(_PATH_DEV) + MNAMELEN]; 66 struct stat sb; 67 struct statfs sf; 68 69 if (strcmp(_fs_fstab.fs_file, "/") != 0) 70 return; 71 if (statfs("/", &sf) != 0) 72 return; 73 if (sf.f_mntfromname[0] == '/') 74 buf[0] = '\0'; 75 else 76 strcpy(buf, _PATH_DEV); 77 strcat(buf, sf.f_mntfromname); 78 if (stat(buf, &sb) != 0 || 79 (!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode))) 80 return; 81 _fs_fstab.fs_spec = buf; 82 } 83 84 static int 85 fstabscan() 86 { 87 char *cp, *p; 88 #define MAXLINELENGTH 1024 89 static char line[MAXLINELENGTH]; 90 char subline[MAXLINELENGTH]; 91 int typexx; 92 93 for (;;) { 94 95 if (!(p = fgets(line, sizeof(line), _fs_fp))) 96 return(0); 97 /* OLD_STYLE_FSTAB */ 98 ++LineNo; 99 if (*line == '#' || *line == '\n') 100 continue; 101 if (!strpbrk(p, " \t")) { 102 _fs_fstab.fs_spec = strsep(&p, ":\n"); 103 _fs_fstab.fs_file = strsep(&p, ":\n"); 104 fixfsfile(); 105 _fs_fstab.fs_type = strsep(&p, ":\n"); 106 if (_fs_fstab.fs_type) { 107 if (!strcmp(_fs_fstab.fs_type, FSTAB_XX)) 108 continue; 109 _fs_fstab.fs_mntops = _fs_fstab.fs_type; 110 _fs_fstab.fs_vfstype = 111 strcmp(_fs_fstab.fs_type, FSTAB_SW) ? 112 "ufs" : "swap"; 113 if ((cp = strsep(&p, ":\n")) != NULL) { 114 _fs_fstab.fs_freq = atoi(cp); 115 if ((cp = strsep(&p, ":\n")) != NULL) { 116 _fs_fstab.fs_passno = atoi(cp); 117 return(1); 118 } 119 } 120 } 121 goto bad; 122 } 123 /* OLD_STYLE_FSTAB */ 124 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 125 ; 126 _fs_fstab.fs_spec = cp; 127 if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#') 128 continue; 129 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 130 ; 131 _fs_fstab.fs_file = cp; 132 fixfsfile(); 133 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 134 ; 135 _fs_fstab.fs_vfstype = cp; 136 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 137 ; 138 _fs_fstab.fs_mntops = cp; 139 if (_fs_fstab.fs_mntops == NULL) 140 goto bad; 141 _fs_fstab.fs_freq = 0; 142 _fs_fstab.fs_passno = 0; 143 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 144 ; 145 if (cp != NULL) { 146 _fs_fstab.fs_freq = atoi(cp); 147 while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0') 148 ; 149 if (cp != NULL) 150 _fs_fstab.fs_passno = atoi(cp); 151 } 152 strcpy(subline, _fs_fstab.fs_mntops); 153 p = subline; 154 for (typexx = 0, cp = strsep(&p, ","); cp; 155 cp = strsep(&p, ",")) { 156 if (strlen(cp) != 2) 157 continue; 158 if (!strcmp(cp, FSTAB_RW)) { 159 _fs_fstab.fs_type = FSTAB_RW; 160 break; 161 } 162 if (!strcmp(cp, FSTAB_RQ)) { 163 _fs_fstab.fs_type = FSTAB_RQ; 164 break; 165 } 166 if (!strcmp(cp, FSTAB_RO)) { 167 _fs_fstab.fs_type = FSTAB_RO; 168 break; 169 } 170 if (!strcmp(cp, FSTAB_SW)) { 171 _fs_fstab.fs_type = FSTAB_SW; 172 break; 173 } 174 if (!strcmp(cp, FSTAB_XX)) { 175 _fs_fstab.fs_type = FSTAB_XX; 176 typexx++; 177 break; 178 } 179 } 180 if (typexx) 181 continue; 182 if (cp != NULL) 183 return(1); 184 185 bad: /* no way to distinguish between EOF and syntax error */ 186 error(EFTYPE); 187 } 188 /* NOTREACHED */ 189 } 190 191 struct fstab * 192 getfsent() 193 { 194 if ((!_fs_fp && !setfsent()) || !fstabscan()) 195 return((struct fstab *)NULL); 196 return(&_fs_fstab); 197 } 198 199 struct fstab * 200 getfsspec(name) 201 const char *name; 202 { 203 if (setfsent()) 204 while (fstabscan()) 205 if (!strcmp(_fs_fstab.fs_spec, name)) 206 return(&_fs_fstab); 207 return((struct fstab *)NULL); 208 } 209 210 struct fstab * 211 getfsfile(name) 212 const char *name; 213 { 214 if (setfsent()) 215 while (fstabscan()) 216 if (!strcmp(_fs_fstab.fs_file, name)) 217 return(&_fs_fstab); 218 return((struct fstab *)NULL); 219 } 220 221 int 222 setfsent() 223 { 224 if (_fs_fp) { 225 rewind(_fs_fp); 226 LineNo = 0; 227 return(1); 228 } 229 if ((_fs_fp = fopen(_PATH_FSTAB, "r")) != NULL) { 230 LineNo = 0; 231 return(1); 232 } 233 error(errno); 234 return(0); 235 } 236 237 void 238 endfsent() 239 { 240 if (_fs_fp) { 241 (void)fclose(_fs_fp); 242 _fs_fp = NULL; 243 } 244 } 245 246 static void 247 error(err) 248 int err; 249 { 250 char *p; 251 char num[30]; 252 253 (void)_write(STDERR_FILENO, "fstab: ", 7); 254 (void)_write(STDERR_FILENO, _PATH_FSTAB, sizeof(_PATH_FSTAB) - 1); 255 (void)_write(STDERR_FILENO, ":", 1); 256 sprintf(num, "%d: ", LineNo); 257 (void)_write(STDERR_FILENO, num, strlen(num)); 258 p = strerror(err); 259 (void)_write(STDERR_FILENO, p, strlen(p)); 260 (void)_write(STDERR_FILENO, "\n", 1); 261 } 262