getmntopts.c revision 152354 
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 * 4. 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
32static char sccsid[] = "@(#)getmntopts.c	8.3 (Berkeley) 3/29/95";
33#endif /* not lint */
34#endif
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: head/sbin/mount/getmntopts.c 152354 2005-11-13 01:27:57Z rodrigc $");
37
38#include <sys/param.h>
39#include <sys/mount.h>
40#include <sys/stat.h>
41#include <sys/uio.h>
42
43#include <assert.h>
44#include <err.h>
45#include <errno.h>
46#include <stdarg.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50#include <sysexits.h>
51
52#include "mntopts.h"
53
54int getmnt_silent = 0;
55
56void
57getmntopts(const char *options, const struct mntopt *m0, int *flagp,
58	int *altflagp)
59{
60	const struct mntopt *m;
61	int negative, len;
62	char *opt, *optbuf, *p;
63	int *thisflagp;
64
65	/* Copy option string, since it is about to be torn asunder... */
66	if ((optbuf = strdup(options)) == NULL)
67		err(1, NULL);
68
69	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
70		/* Check for "no" prefix. */
71		if (opt[0] == 'n' && opt[1] == 'o') {
72			negative = 1;
73			opt += 2;
74		} else
75			negative = 0;
76
77		/*
78		 * for options with assignments in them (ie. quotas)
79		 * ignore the assignment as it's handled elsewhere
80		 */
81		p = strchr(opt, '=');
82		if (p != NULL)
83			 *++p = '\0';
84
85		/* Scan option table. */
86		for (m = m0; m->m_option != NULL; ++m) {
87			len = strlen(m->m_option);
88			if (strncasecmp(opt, m->m_option, len) == 0)
89				if (opt[len] == '\0' || opt[len] == '=')
90					break;
91		}
92
93		/* Save flag, or fail if option is not recognized. */
94		if (m->m_option) {
95			thisflagp = m->m_altloc ? altflagp : flagp;
96			if (negative == m->m_inverse)
97				*thisflagp |= m->m_flag;
98			else
99				*thisflagp &= ~m->m_flag;
100		} else if (!getmnt_silent) {
101			errx(1, "-o %s: option not supported", opt);
102		}
103	}
104
105	free(optbuf);
106}
107
108void
109rmslashes(char *rrpin, char *rrpout)
110{
111	char *rrpoutstart;
112
113	*rrpout = *rrpin;
114	for (rrpoutstart = rrpout; *rrpin != '\0'; *rrpout++ = *rrpin++) {
115
116		/* skip all double slashes */
117		while (*rrpin == '/' && *(rrpin + 1) == '/')
118			 rrpin++;
119	}
120
121	/* remove trailing slash if necessary */
122	if (rrpout - rrpoutstart > 1 && *(rrpout - 1) == '/')
123		*(rrpout - 1) = '\0';
124	else
125		*rrpout = '\0';
126}
127
128void
129checkpath(const char *path, char *resolved)
130{
131	struct stat sb;
132
133	if (realpath(path, resolved) != NULL && stat(resolved, &sb) == 0) {
134		if (!S_ISDIR(sb.st_mode))
135			errx(EX_USAGE, "%s: not a directory", resolved);
136	} else
137		errx(EX_USAGE, "%s: %s", resolved, strerror(errno));
138}
139
140void
141build_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		len = strlen(val) + 1;
160	(*iov)[i].iov_len = (int)len;
161	*iovlen = ++i;
162}
163
164/*
165 * This function is needed for compatibility with parameters
166 * which used to use the mount_argf() command for the old mount() syscall.
167 */
168void
169build_iovec_argf(struct iovec **iov, int *iovlen, const char *name,
170    const char *fmt, ...)
171{
172	va_list ap;
173	char val[255] = { 0 };
174
175	va_start(ap, fmt);
176	vsnprintf(val, sizeof(val), fmt, ap);
177	va_end(ap);
178	build_iovec(iov, iovlen, name, strdup(val), (size_t)-1);
179}
180