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      1 /*	$NetBSD: getmntopts.c,v 1.4 2007/08/26 22:46:15 pooka Exp $	*/
      2 
      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 #include <sys/cdefs.h>
     33 #ifndef lint
     34 #if 0
     35 static char sccsid[] = "@(#)getmntopts.c	8.3 (Berkeley) 3/29/95";
     36 #else
     37 __RCSID("$NetBSD: getmntopts.c,v 1.4 2007/08/26 22:46:15 pooka Exp $");
     38 #endif
     39 #endif /* not lint */
     40 
     41 #include <sys/param.h>
     42 #include <sys/mount.h>
     43 
     44 #include <err.h>
     45 #include <errno.h>
     46 #include <fstab.h>
     47 #include <stdlib.h>
     48 #include <string.h>
     49 
     50 #include <mntopts.h>
     51 
     52 int getmnt_silent = 0;
     53 
     54 static const char errmsg[] = "-o %s: option not supported";
     55 
     56 struct mntoptparse {
     57 	const char *options;
     58 	const struct mntopt *mopts;
     59 	char *optbuf;
     60 	char **optarg;
     61 };
     62 
     63 const char *
     64 getmntoptstr(mntoptparse_t mp, const char *opt)
     65 {
     66 	const struct mntopt *m;
     67 
     68 	for (m = mp->mopts; m->m_option != NULL; m++)
     69 		if (strcasecmp(opt, m->m_option) == 0)
     70 			break;
     71 
     72 	if (m->m_option == NULL) {
     73 		if (getmnt_silent == 0)
     74 			errx(1, errmsg, opt);
     75 		else
     76 			return NULL;
     77 	}
     78 
     79 	return mp->optarg[m - mp->mopts];
     80 }
     81 
     82 long
     83 getmntoptnum(mntoptparse_t mp, const char *opt)
     84 {
     85 	char *ep;
     86 	long rv;
     87 	void (*fun)(int, const char *, ...) = NULL;
     88 	const char *val = getmntoptstr(mp, opt);
     89 
     90 	if (val == NULL) {
     91 		if (getmnt_silent == 0)
     92 			errx(1, "Missing %s argument", opt);
     93 		else
     94 			return -1;
     95 	}
     96 
     97 	errno = 0;
     98 	rv = strtol(val, &ep, 0);
     99 
    100 	if (*ep)
    101 		fun = errx;
    102 
    103 	if (errno == ERANGE && (rv == LONG_MAX || rv == LONG_MIN))
    104 		fun = err;
    105 
    106 	if (fun) {
    107 		if (getmnt_silent != 0)
    108 			return -1;
    109 		(*fun)(1, "Invalid %s argument `%s'", opt, val);
    110 	}
    111 	return rv;
    112 }
    113 
    114 void
    115 freemntopts(mntoptparse_t mp)
    116 {
    117 	free(mp->optbuf);
    118 	free(mp->optarg);
    119 	free(mp);
    120 }
    121 
    122 mntoptparse_t
    123 getmntopts(const char *options, const struct mntopt *m0, int *flagp,
    124     int *altflagp)
    125 {
    126 	const struct mntopt *m;
    127 	int negative;
    128 	char *opt, *p;
    129 	int *thisflagp;
    130 	size_t nopts;
    131 	mntoptparse_t mp;
    132 
    133 	for (nopts = 0, m = m0; m->m_option != NULL; ++m, nopts++)
    134 		continue;
    135 
    136 	if ((mp = malloc(sizeof(struct mntoptparse))) == NULL)
    137 		return NULL;
    138 
    139 	/* Copy option string, since it is about to be torn asunder... */
    140 	if ((mp->optbuf = strdup(options)) == NULL) {
    141 		free(mp);
    142 		return NULL;
    143 	}
    144 
    145 	if ((mp->optarg = calloc(nopts, sizeof(char *))) == NULL) {
    146 		free(mp->optbuf);
    147 		free(mp);
    148 		return NULL;
    149 	}
    150 
    151 	mp->mopts = m0;
    152 	mp->options = options;
    153 
    154 	for (opt = mp->optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
    155 		/* Check for "no" prefix. */
    156 		if (opt[0] == 'n' && opt[1] == 'o') {
    157 			negative = 1;
    158 			opt += 2;
    159 		} else
    160 			negative = 0;
    161 
    162 		/*
    163 		 * for options with assignments in them (ie. quotas)
    164 		 * ignore the assignment as it's handled elsewhere
    165 		 */
    166 		p = strchr(opt, '=');
    167 		if (p) {
    168 			 *p++ = '\0';
    169 		}
    170 
    171 		/* Scan option table. */
    172 		for (m = m0; m->m_option != NULL; ++m)
    173 			if (strcasecmp(opt, m->m_option) == 0)
    174 				break;
    175 
    176 		/* Save flag, or fail if option is not recognised. */
    177 		if (m->m_option) {
    178 			mp->optarg[m - m0] = p;
    179 			thisflagp = m->m_altloc ? altflagp : flagp;
    180 			if (negative == m->m_inverse)
    181 				*thisflagp |= m->m_flag;
    182 			else
    183 				*thisflagp &= ~m->m_flag;
    184 		} else if (!getmnt_silent) {
    185 			errx(1, errmsg, opt);
    186 		} else {
    187 			free(mp->optbuf);
    188 			free(mp);
    189 
    190 			return NULL;
    191 		}
    192 	}
    193 	return mp;
    194 }
    195