getmntopts.c revision 138097 
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 138097 2004-11-25 16:14:27Z delphij $");
37
38#include <sys/param.h>
39#include <sys/stat.h>
40#include <sys/uio.h>
41
42#include <err.h>
43#include <errno.h>
44#include <stdlib.h>
45#include <string.h>
46#include <sysexits.h>
47
48#include "mntopts.h"
49
50int getmnt_silent = 0;
51
52void
53getmntopts(options, m0, flagp, altflagp)
54	const char *options;
55	const struct mntopt *m0;
56	int *flagp;
57	int *altflagp;
58{
59	const struct mntopt *m;
60	int negative, len;
61	char *opt, *optbuf, *p;
62	int *thisflagp;
63
64	/* Copy option string, since it is about to be torn asunder... */
65	if ((optbuf = strdup(options)) == NULL)
66		err(1, NULL);
67
68	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
69		/* Check for "no" prefix. */
70		if (opt[0] == 'n' && opt[1] == 'o') {
71			negative = 1;
72			opt += 2;
73		} else
74			negative = 0;
75
76		/*
77		 * for options with assignments in them (ie. quotas)
78		 * ignore the assignment as it's handled elsewhere
79		 */
80		p = strchr(opt, '=');
81		if (p != NULL)
82			 *++p = '\0';
83
84		/* Scan option table. */
85		for (m = m0; m->m_option != NULL; ++m) {
86			len = strlen(m->m_option);
87			if (strncasecmp(opt, m->m_option, len) == 0)
88				if (opt[len] == '\0' || opt[len] == '=')
89					break;
90		}
91
92		/* Save flag, or fail if option is not recognized. */
93		if (m->m_option) {
94			thisflagp = m->m_altloc ? altflagp : flagp;
95			if (negative == m->m_inverse)
96				*thisflagp |= m->m_flag;
97			else
98				*thisflagp &= ~m->m_flag;
99		} else if (!getmnt_silent) {
100			errx(1, "-o %s: option not supported", opt);
101		}
102	}
103
104	free(optbuf);
105}
106
107void
108rmslashes(rrpin, rrpout)
109	char *rrpin;
110	char *rrpout;
111{
112	char *rrpoutstart;
113
114	*rrpout = *rrpin;
115	for (rrpoutstart = rrpout; *rrpin != '\0'; *rrpout++ = *rrpin++) {
116
117		/* skip all double slashes */
118		while (*rrpin == '/' && *(rrpin + 1) == '/')
119			 rrpin++;
120	}
121
122	/* remove trailing slash if necessary */
123	if (rrpout - rrpoutstart > 1 && *(rrpout - 1) == '/')
124		*(rrpout - 1) = '\0';
125	else
126		*rrpout = '\0';
127}
128
129void
130checkpath(path, resolved)
131	const char *path;
132	char *resolved;
133{
134	struct stat sb;
135
136	if (realpath(path, resolved) != NULL && stat(resolved, &sb) == 0) {
137		if (!S_ISDIR(sb.st_mode))
138			errx(EX_USAGE, "%s: not a directory", resolved);
139	} else
140		errx(EX_USAGE, "%s: %s", resolved, strerror(errno));
141}
142
143void
144build_iovec(struct iovec **iov, int *iovlen, const char *name, void *val, int len)
145{
146	int i;
147
148	if (*iovlen < 0)
149		return;
150	i = *iovlen;
151	*iov = realloc(*iov, sizeof **iov * (i + 2));
152	if (*iov == NULL) {
153		*iovlen = -1;
154		return;
155	}
156	(*iov)[i].iov_base = strdup(name);
157	(*iov)[i].iov_len = strlen(name) + 1;
158	i++;
159	(*iov)[i].iov_base = val;
160	if (len < 0)
161		len = strlen(val) + 1;
162	(*iov)[i].iov_len = len;
163	*iovlen = ++i;
164}
165