freebsd-dev/lib/libc/gen/fstab.c

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/*
* Copyright (c) 1980, 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)fstab.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
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#include "namespace.h"
#include <sys/param.h>
#include <sys/mount.h>
#include <sys/stat.h>
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#include <errno.h>
#include <fstab.h>
#include <paths.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "un-namespace.h"
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static FILE *_fs_fp;
static struct fstab _fs_fstab;
static int LineNo = 0;
static char *path_fstab;
static char fstab_path[PATH_MAX];
static int fsp_set = 0;
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static void error(int);
static void fixfsfile(void);
static int fstabscan(void);
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void
setfstab(const char *file)
{
if (file == NULL) {
path_fstab = _PATH_FSTAB;
} else {
strncpy(fstab_path, file, PATH_MAX);
fstab_path[PATH_MAX - 1] = '\0';
path_fstab = fstab_path;
}
fsp_set = 1;
return;
}
const char *
getfstab (void)
{
if (fsp_set)
return (path_fstab);
else
return (_PATH_FSTAB);
}
static void
fixfsfile()
{
static char buf[sizeof(_PATH_DEV) + MNAMELEN];
struct stat sb;
struct statfs sf;
if (strcmp(_fs_fstab.fs_file, "/") != 0)
return;
if (statfs("/", &sf) != 0)
return;
if (sf.f_mntfromname[0] == '/')
buf[0] = '\0';
else
strcpy(buf, _PATH_DEV);
strcat(buf, sf.f_mntfromname);
if (stat(buf, &sb) != 0 ||
(!S_ISBLK(sb.st_mode) && !S_ISCHR(sb.st_mode)))
return;
_fs_fstab.fs_spec = buf;
}
static int
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fstabscan()
{
char *cp, *p;
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#define MAXLINELENGTH 1024
static char line[MAXLINELENGTH];
char subline[MAXLINELENGTH];
int typexx;
for (;;) {
if (!(p = fgets(line, sizeof(line), _fs_fp)))
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return(0);
/* OLD_STYLE_FSTAB */
++LineNo;
if (*line == '#' || *line == '\n')
continue;
if (!strpbrk(p, " \t")) {
_fs_fstab.fs_spec = strsep(&p, ":\n");
_fs_fstab.fs_file = strsep(&p, ":\n");
fixfsfile();
_fs_fstab.fs_type = strsep(&p, ":\n");
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if (_fs_fstab.fs_type) {
if (!strcmp(_fs_fstab.fs_type, FSTAB_XX))
continue;
_fs_fstab.fs_mntops = _fs_fstab.fs_type;
_fs_fstab.fs_vfstype =
strcmp(_fs_fstab.fs_type, FSTAB_SW) ?
"ufs" : "swap";
if ((cp = strsep(&p, ":\n")) != NULL) {
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_fs_fstab.fs_freq = atoi(cp);
if ((cp = strsep(&p, ":\n")) != NULL) {
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_fs_fstab.fs_passno = atoi(cp);
return(1);
}
}
}
goto bad;
}
/* OLD_STYLE_FSTAB */
while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
;
_fs_fstab.fs_spec = cp;
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if (!_fs_fstab.fs_spec || *_fs_fstab.fs_spec == '#')
continue;
while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
;
_fs_fstab.fs_file = cp;
fixfsfile();
while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
;
_fs_fstab.fs_vfstype = cp;
while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
;
_fs_fstab.fs_mntops = cp;
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if (_fs_fstab.fs_mntops == NULL)
goto bad;
_fs_fstab.fs_freq = 0;
_fs_fstab.fs_passno = 0;
while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
;
if (cp != NULL) {
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_fs_fstab.fs_freq = atoi(cp);
while ((cp = strsep(&p, " \t\n")) != NULL && *cp == '\0')
;
if (cp != NULL)
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_fs_fstab.fs_passno = atoi(cp);
}
strcpy(subline, _fs_fstab.fs_mntops);
p = subline;
for (typexx = 0, cp = strsep(&p, ","); cp;
cp = strsep(&p, ",")) {
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if (strlen(cp) != 2)
continue;
if (!strcmp(cp, FSTAB_RW)) {
_fs_fstab.fs_type = FSTAB_RW;
break;
}
if (!strcmp(cp, FSTAB_RQ)) {
_fs_fstab.fs_type = FSTAB_RQ;
break;
}
if (!strcmp(cp, FSTAB_RO)) {
_fs_fstab.fs_type = FSTAB_RO;
break;
}
if (!strcmp(cp, FSTAB_SW)) {
_fs_fstab.fs_type = FSTAB_SW;
break;
}
if (!strcmp(cp, FSTAB_XX)) {
_fs_fstab.fs_type = FSTAB_XX;
typexx++;
break;
}
}
if (typexx)
continue;
if (cp != NULL)
return(1);
bad: /* no way to distinguish between EOF and syntax error */
error(EFTYPE);
}
/* NOTREACHED */
}
struct fstab *
getfsent()
{
if ((!_fs_fp && !setfsent()) || !fstabscan())
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return((struct fstab *)NULL);
return(&_fs_fstab);
}
struct fstab *
getfsspec(name)
const char *name;
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{
if (setfsent())
while (fstabscan())
if (!strcmp(_fs_fstab.fs_spec, name))
return(&_fs_fstab);
return((struct fstab *)NULL);
}
struct fstab *
getfsfile(name)
const char *name;
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{
if (setfsent())
while (fstabscan())
if (!strcmp(_fs_fstab.fs_file, name))
return(&_fs_fstab);
return((struct fstab *)NULL);
}
int
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setfsent()
{
if (_fs_fp) {
rewind(_fs_fp);
LineNo = 0;
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return(1);
}
if (fsp_set == 0) {
if (issetugid())
setfstab(NULL);
else
setfstab(getenv("PATH_FSTAB"));
}
if ((_fs_fp = fopen(path_fstab, "r")) != NULL) {
LineNo = 0;
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return(1);
}
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error(errno);
return(0);
}
void
endfsent()
{
if (_fs_fp) {
(void)fclose(_fs_fp);
_fs_fp = NULL;
}
fsp_set = 0;
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}
static void
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error(err)
int err;
{
char *p;
char num[30];
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(void)_write(STDERR_FILENO, "fstab: ", 7);
(void)_write(STDERR_FILENO, path_fstab, strlen(path_fstab));
(void)_write(STDERR_FILENO, ":", 1);
sprintf(num, "%d: ", LineNo);
(void)_write(STDERR_FILENO, num, strlen(num));
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p = strerror(err);
(void)_write(STDERR_FILENO, p, strlen(p));
(void)_write(STDERR_FILENO, "\n", 1);
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}