1 /* $NetBSD: mtab.c,v 1.1.1.2 2009/03/20 20:26:55 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2009 Erez Zadok 5 * Copyright (c) 1989 Jan-Simon Pendry 6 * Copyright (c) 1989 Imperial College of Science, Technology & Medicine 7 * Copyright (c) 1989 The Regents of the University of California. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * Jan-Simon Pendry at Imperial College, London. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgment: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * 42 * File: am-utils/libamu/mtab.c 43 * 44 */ 45 46 #ifdef HAVE_CONFIG_H 47 # include <config.h> 48 #endif /* HAVE_CONFIG_H */ 49 #include <am_defs.h> 50 #include <amu.h> 51 52 53 /* 54 * Firewall /etc/mtab entries 55 */ 56 void 57 mnt_free(mntent_t *mp) 58 { 59 XFREE(mp->mnt_fsname); 60 XFREE(mp->mnt_dir); 61 XFREE(mp->mnt_type); 62 XFREE(mp->mnt_opts); 63 64 #ifdef HAVE_MNTENT_T_MNT_TIME 65 # ifdef HAVE_MNTENT_T_MNT_TIME_STRING 66 XFREE(mp->mnt_time); 67 # endif /* HAVE_MNTENT_T_MNT_TIME_STRING */ 68 #endif /* HAVE_MNTENT_T_MNT_TIME */ 69 70 XFREE(mp); 71 } 72 73 74 /* 75 * Discard memory allocated for mount list 76 */ 77 void 78 discard_mntlist(mntlist *mp) 79 { 80 mntlist *mp2; 81 82 while ((mp2 = mp)) { 83 mp = mp->mnext; 84 if (mp2->mnt) 85 mnt_free(mp2->mnt); 86 XFREE(mp2); 87 } 88 } 89 90 91 /* 92 * Throw away a mount list 93 */ 94 void 95 free_mntlist(mntlist *mp) 96 { 97 discard_mntlist(mp); 98 #ifdef MOUNT_TABLE_ON_FILE 99 unlock_mntlist(); 100 #endif /* MOUNT_TABLE_ON_FILE */ 101 } 102 103 104 /* 105 * Utility routine which returns a pointer to whatever follows an = in a 106 * string. Returns null if = is not found in the string. 107 */ 108 char * 109 haseq(char *instr) 110 { 111 if (instr) { 112 char *eq = strchr(instr, '='); 113 if (eq) return ++eq; 114 } 115 return NULL; 116 } 117 118 119 /* 120 * Utility routine which returns a pointer to whatever 121 * follows an = in a mount option. Returns null if option 122 * doesn't exist or doesn't have an '='. Won't fail for opt,foo=. 123 */ 124 char * 125 hasmnteq(mntent_t *mnt, char *opt) 126 { 127 if (mnt && opt) { /* disallow null input pointers */ 128 if ( *opt ) { /* disallow the null string as an opt */ 129 char *str = amu_hasmntopt(mnt, opt); 130 if ( str ) { /* option was there */ 131 char *eq = str + strlen(opt); /* Look at char just after option */ 132 if (*eq == '=') /* Is it '=' ? */ 133 return ++eq; /* If so, return pointer to remaining str */ 134 } 135 } 136 } 137 return NULL; 138 } 139 140 141 /* 142 * Wrapper around hasmntvalerr(), which retains backwards compatibiliy with 143 * older use of hasmntval(). 144 * 145 * XXX: eventually, all use of hasmntval() should be replaced with 146 * hasmntvalerr(). 147 */ 148 int 149 hasmntval(mntent_t *mnt, char *opt) 150 { 151 int err, val = 0; 152 153 err = hasmntvalerr(mnt, opt, &val); 154 if (err) /* if there was an error (hasmntvalerr returned 1) */ 155 return 0; /* redundant: val==0 above, but leave here for clarity */ 156 /* otherwise there was no error */ 157 return val; 158 } 159 160 161 /* 162 * Utility routine which determines the value of a numeric option in the 163 * mount options (such as port=%d), and fills in the value in the argument 164 * valp (argument won't be touched if no value is set, for example due to an 165 * error). 166 * 167 * Returns non-zero (1) on error; returns 0 on success. 168 * 169 * XXX: eventually, all use of hasmntval() should be replaced with 170 * hasmntvalerr(). 171 */ 172 unsigned int 173 hasmntvalerr(mntent_t *mnt, char *opt, int *valp) 174 { 175 char *str = amu_hasmntopt(mnt, opt); 176 int err = 1; /* 1 means no good value was set (an error) */ 177 char *eq, *endptr; 178 long int i; 179 180 /* exit if no option specificed */ 181 if (!str) { 182 goto out; 183 } 184 185 eq = hasmnteq(mnt, opt); 186 187 if (!eq) { /* no argument to option ('=' sign was missing) */ 188 plog(XLOG_MAP, "numeric option to \"%s\" missing", opt); 189 goto out; 190 } 191 192 /* if got here, then we had an '=' after option name */ 193 endptr = NULL; 194 i = strtol(eq, &endptr, 0); /* hex and octal allowed ;-) */ 195 if (!endptr || 196 (endptr != eq && (*endptr == ',' || *endptr == '\0'))) { 197 /* 198 * endptr set means strtol saw a non-digit. If the non-digit is a 199 * comma, it's probably the start of the next option. If the comma is 200 * the first char though, complain about it (foo=,bar is made 201 * noticeable by this). 202 * 203 * Similar reasoning for '\0' instead of comma, it's the end of the 204 * string. 205 */ 206 *valp = (int) i; /* set good value */ 207 err = 0; /* no error */ 208 } else { 209 /* whatever was after the '=' sign wasn't a number */ 210 plog(XLOG_MAP, "invalid numeric option in \"%s\": \"%s\"", opt, str); 211 /* fall through to error/exit processing */ 212 } 213 214 out: 215 return err; 216 } 217 218 219 /* 220 * Utility routine which returns the string value of 221 * an option in the mount options (such as proto=udp). 222 * Returns NULL if the option is not specified. 223 * Returns malloc'ed string (caller must free!) 224 */ 225 char * 226 hasmntstr(mntent_t *mnt, char *opt) 227 { 228 char *str = amu_hasmntopt(mnt, opt); 229 230 if (str) { /* The option was there */ 231 232 char *eq = hasmnteq(mnt, opt); 233 234 if (eq) { /* and had an = after it */ 235 236 char *endptr = strchr(eq, ','); 237 238 /* if saw no comma, return strdup'd string */ 239 if (!endptr) 240 return strdup(eq); 241 else { 242 /* else we need to copy only the chars needed */ 243 int len = endptr - eq; 244 char *buf = xmalloc(len + 1); 245 strncpy(buf, eq, len); 246 buf[len] = '\0'; 247 return buf; 248 } 249 } 250 } 251 return NULL; 252 } 253