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