/*
* Copyright (c) 1999 Martin Blapp
* 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
*
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/syslog.h>
#include <rpc/rpc.h>
#include <rpcsvc/mount.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mounttab.h"
struct mtablist *mtabhead;
static void badline(const char *field, const char *bad);
/*
* Add an entry to PATH_MOUNTTAB for each mounted NFS filesystem,
* so the client can notify the NFS server even after reboot.
*/
int
add_mtab(char *hostp, char *dirp)
{
FILE *mtabfile;
if ((mtabfile = fopen(PATH_MOUNTTAB, "a")) == NULL)
return (0);
else {
fprintf(mtabfile, "%ld\t%s\t%s\n",
(long)time(NULL), hostp, dirp);
fclose(mtabfile);
return (1);
}
}
/*
* Read mounttab line for line and return struct mtablist.
*/
int
read_mtab(void)
{
struct mtablist **mtabpp, *mtabp;
char *hostp, *dirp, *cp;
char str[STRSIZ];
char *timep, *endp;
time_t actiontime;
u_long ultmp;
FILE *mtabfile;
if ((mtabfile = fopen(PATH_MOUNTTAB, "r")) == NULL) {
if (errno == ENOENT)
return (0);
else {
syslog(LOG_ERR, "can't open %s", PATH_MOUNTTAB);
return (0);
}
}
actiontime = 0;
mtabpp = &mtabhead;
while (fgets(str, STRSIZ, mtabfile) != NULL) {
cp = str;
errno = 0;
if (*cp == '#' || *cp == ' ' || *cp == '\n')
continue;
timep = strsep(&cp, " \t\n");
if (timep == NULL || *timep == '\0') {
badline("time", timep);
continue;
}
hostp = strsep(&cp, " \t\n");
if (hostp == NULL || *hostp == '\0') {
badline("host", hostp);
continue;
}
dirp = strsep(&cp, " \t\n");
if (dirp == NULL || *dirp == '\0') {
badline("dir", dirp);
continue;
}
ultmp = strtoul(timep, &endp, 10);
if (ultmp == ULONG_MAX || *endp != '\0') {
badline("time", timep);
continue;
}
actiontime = ultmp;
if ((mtabp = malloc(sizeof (struct mtablist))) == NULL) {
syslog(LOG_ERR, "malloc");
fclose(mtabfile);
return (0);
}
mtabp->mtab_time = actiontime;
memmove(mtabp->mtab_host, hostp, MNTNAMLEN);
mtabp->mtab_host[MNTNAMLEN - 1] = '\0';
memmove(mtabp->mtab_dirp, dirp, MNTPATHLEN);
mtabp->mtab_dirp[MNTPATHLEN - 1] = '\0';
mtabp->mtab_next = (struct mtablist *)NULL;
*mtabpp = mtabp;
mtabpp = &mtabp->mtab_next;
}
fclose(mtabfile);
return (1);
}
/*
* Rewrite PATH_MOUNTTAB from scratch and skip bad entries.
* Unlink PATH_MOUNTAB if no entry is left.
*/
int
write_mtab(int verbose)
{
struct mtablist *mtabp, *mp;
FILE *mtabfile;
int line;
if ((mtabfile = fopen(PATH_MOUNTTAB, "w")) == NULL) {
syslog(LOG_ERR, "can't write to %s", PATH_MOUNTTAB);
return (0);
}
line = 0;
for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) {
if (mtabp->mtab_host[0] == '\0')
continue;
/* Skip if a later (hence more recent) entry is identical. */
for (mp = mtabp->mtab_next; mp != NULL; mp = mp->mtab_next)
if (strcmp(mtabp->mtab_host, mp->mtab_host) == 0 &&
strcmp(mtabp->mtab_dirp, mp->mtab_dirp) == 0)
break;
if (mp != NULL)
continue;
fprintf(mtabfile, "%ld\t%s\t%s\n",
(long)mtabp->mtab_time, mtabp->mtab_host,
mtabp->mtab_dirp);
if (verbose)
warnx("write mounttab entry %s:%s",
mtabp->mtab_host, mtabp->mtab_dirp);
line++;
}
fclose(mtabfile);
if (line == 0) {
if (unlink(PATH_MOUNTTAB) == -1) {
syslog(LOG_ERR, "can't remove %s", PATH_MOUNTTAB);
return (0);
}
}
return (1);
}
/*
* Mark the entries as clean where RPC calls have been done successfully.
*/
void
clean_mtab(char *hostp, char *dirp, int verbose)
{
struct mtablist *mtabp;
char *host;
/* Copy hostp in case it points to an entry that we are zeroing out. */
host = strdup(hostp);
for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) {
if (strcmp(mtabp->mtab_host, host) != 0)
continue;
if (dirp != NULL && strcmp(mtabp->mtab_dirp, dirp) != 0)
continue;
if (verbose)
warnx("delete mounttab entry%s %s:%s",
(dirp == NULL) ? " by host" : "",
mtabp->mtab_host, mtabp->mtab_dirp);
bzero(mtabp->mtab_host, MNTNAMLEN);
}
free(host);
}
/*
* Free struct mtablist mtab.
*/
void
free_mtab(void)
{
struct mtablist *mtabp;
while ((mtabp = mtabhead) != NULL) {
mtabhead = mtabhead->mtab_next;
free(mtabp);
}
}
/*
* Print bad lines to syslog.
*/
static void
badline(const char *field, const char *bad)
{
syslog(LOG_ERR, "bad mounttab %s field '%s'", field,
(bad == NULL) ? "<null>" : bad);
}
