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: stable/11/sbin/mount/getmntopts.c 310374 2016-12-21 22:04:44Z brooks $");
37
38#include <sys/param.h>
39#include <sys/mount.h>
40#include <sys/stat.h>
41#include <sys/uio.h>
42
43#include <err.h>
44#include <errno.h>
45#include <stdarg.h>
46#include <stdio.h>
47#include <stdlib.h>
48#include <string.h>
49
50#include "mntopts.h"
51
52int getmnt_silent = 0;
53
54void
55getmntopts(const char *options, const struct mntopt *m0, int *flagp,
56	int *altflagp)
57{
58	const struct mntopt *m;
59	int negative, len;
60	char *opt, *optbuf, *p;
61	int *thisflagp;
62
63	/* Copy option string, since it is about to be torn asunder... */
64	if ((optbuf = strdup(options)) == NULL)
65		err(1, NULL);
66
67	for (opt = optbuf; (opt = strtok(opt, ",")) != NULL; opt = NULL) {
68		/* Check for "no" prefix. */
69		if (opt[0] == 'n' && opt[1] == 'o') {
70			negative = 1;
71			opt += 2;
72		} else
73			negative = 0;
74
75		/*
76		 * for options with assignments in them (ie. quotas)
77		 * ignore the assignment as it's handled elsewhere
78		 */
79		p = strchr(opt, '=');
80		if (p != NULL)
81			 *++p = '\0';
82
83		/* Scan option table. */
84		for (m = m0; m->m_option != NULL; ++m) {
85			len = strlen(m->m_option);
86			if (strncasecmp(opt, m->m_option, len) == 0)
87				if (opt[len] == '\0' || opt[len] == '=')
88					break;
89		}
90
91		/* Save flag, or fail if option is not recognized. */
92		if (m->m_option) {
93			thisflagp = m->m_altloc ? altflagp : flagp;
94			if (negative == m->m_inverse)
95				*thisflagp |= m->m_flag;
96			else
97				*thisflagp &= ~m->m_flag;
98		} else if (!getmnt_silent) {
99			errx(1, "-o %s: option not supported", opt);
100		}
101	}
102
103	free(optbuf);
104}
105
106void
107rmslashes(char *rrpin, char *rrpout)
108{
109	char *rrpoutstart;
110
111	*rrpout = *rrpin;
112	for (rrpoutstart = rrpout; *rrpin != '\0'; *rrpout++ = *rrpin++) {
113
114		/* skip all double slashes */
115		while (*rrpin == '/' && *(rrpin + 1) == '/')
116			 rrpin++;
117	}
118
119	/* remove trailing slash if necessary */
120	if (rrpout - rrpoutstart > 1 && *(rrpout - 1) == '/')
121		*(rrpout - 1) = '\0';
122	else
123		*rrpout = '\0';
124}
125
126int
127checkpath(const char *path, char *resolved)
128{
129	struct stat sb;
130
131	if (realpath(path, resolved) == NULL || stat(resolved, &sb) != 0)
132		return (1);
133	if (!S_ISDIR(sb.st_mode)) {
134		errno = ENOTDIR;
135		return (1);
136	}
137	return (0);
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		if (val != NULL)
160			len = strlen(val) + 1;
161		else
162			len = 0;
163	}
164	(*iov)[i].iov_len = (int)len;
165	*iovlen = ++i;
166}
167
168/*
169 * This function is needed for compatibility with parameters
170 * which used to use the mount_argf() command for the old mount() syscall.
171 */
172void
173build_iovec_argf(struct iovec **iov, int *iovlen, const char *name,
174    const char *fmt, ...)
175{
176	va_list ap;
177	char val[255] = { 0 };
178
179	va_start(ap, fmt);
180	vsnprintf(val, sizeof(val), fmt, ap);
181	va_end(ap);
182	build_iovec(iov, iovlen, name, strdup(val), (size_t)-1);
183}
184
185/*
186 * Free the iovec and reset to NULL with zero length.  Useful for calling
187 * nmount in a loop.
188 */
189void
190free_iovec(struct iovec **iov, int *iovlen)
191{
192	int i;
193
194	for (i = 0; i < *iovlen; i++)
195		free((*iov)[i].iov_base);
196	free(*iov);
197}
198