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225 lines
5.6 KiB
C
225 lines
5.6 KiB
C
/*
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* Copyright (c) 1999 Martin Blapp
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* 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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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/syslog.h>
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#include <rpc/rpc.h>
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#include <nfs/rpcv2.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.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 "mounttab.h"
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struct mtablist *mtabhead;
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static void badline(char *field, char *bad);
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/*
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* Add an entry to PATH_MOUNTTAB for each mounted NFS filesystem,
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* so the client can notify the NFS server even after reboot.
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*/
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int
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add_mtab(char *hostp, char *dirp) {
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FILE *mtabfile;
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if ((mtabfile = fopen(PATH_MOUNTTAB, "a")) == NULL)
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return (0);
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else {
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fprintf(mtabfile, "%ld\t%s\t%s\n",
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(long)time(NULL), hostp, dirp);
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fclose(mtabfile);
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return (1);
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}
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}
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/*
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* Read mounttab line for line and return struct mtablist.
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*/
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int
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read_mtab() {
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struct mtablist **mtabpp, *mtabp;
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char *hostp, *dirp, *cp;
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char str[STRSIZ];
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char *timep, *endp;
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time_t time;
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u_long ultmp;
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FILE *mtabfile;
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if ((mtabfile = fopen(PATH_MOUNTTAB, "r")) == NULL) {
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if (errno == ENOENT)
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return (0);
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else {
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syslog(LOG_ERR, "can't open %s", PATH_MOUNTTAB);
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return (0);
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}
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}
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time = 0;
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mtabpp = &mtabhead;
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while (fgets(str, STRSIZ, mtabfile) != NULL) {
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cp = str;
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errno = 0;
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if (*cp == '#' || *cp == ' ' || *cp == '\n')
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continue;
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timep = strsep(&cp, " \t\n");
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if (timep == NULL || *timep == '\0') {
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badline("time", timep);
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continue;
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}
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hostp = strsep(&cp, " \t\n");
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if (hostp == NULL || *hostp == '\0') {
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badline("host", hostp);
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continue;
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}
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dirp = strsep(&cp, " \t\n");
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if (dirp == NULL || *dirp == '\0') {
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badline("dir", dirp);
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continue;
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}
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ultmp = strtoul(timep, &endp, 10);
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if (ultmp == ULONG_MAX || *endp != '\0') {
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badline("time", timep);
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continue;
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}
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time = ultmp;
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if ((mtabp = malloc(sizeof (struct mtablist))) == NULL) {
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syslog(LOG_ERR, "malloc");
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fclose(mtabfile);
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return (0);
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}
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mtabp->mtab_time = time;
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memmove(mtabp->mtab_host, hostp, RPCMNT_NAMELEN);
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mtabp->mtab_host[RPCMNT_NAMELEN - 1] = '\0';
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memmove(mtabp->mtab_dirp, dirp, RPCMNT_PATHLEN);
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mtabp->mtab_dirp[RPCMNT_PATHLEN - 1] = '\0';
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mtabp->mtab_next = (struct mtablist *)NULL;
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*mtabpp = mtabp;
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mtabpp = &mtabp->mtab_next;
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}
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fclose(mtabfile);
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return (1);
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}
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/*
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* Rewrite PATH_MOUNTTAB from scratch and skip bad entries.
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* Unlink PATH_MOUNTAB if no entry is left.
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*/
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int
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write_mtab(int verbose) {
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struct mtablist *mtabp, *mp;
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FILE *mtabfile;
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int line;
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if ((mtabfile = fopen(PATH_MOUNTTAB, "w")) == NULL) {
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syslog(LOG_ERR, "can't write to %s", PATH_MOUNTTAB);
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return (0);
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}
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line = 0;
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for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) {
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if (mtabp->mtab_host[0] == '\0')
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continue;
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/* Skip if a later (hence more recent) entry is identical. */
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for (mp = mtabp->mtab_next; mp != NULL; mp = mp->mtab_next)
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if (strcmp(mtabp->mtab_host, mp->mtab_host) == 0 &&
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strcmp(mtabp->mtab_dirp, mp->mtab_dirp) == 0)
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break;
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if (mp != NULL)
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continue;
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fprintf(mtabfile, "%ld\t%s\t%s\n",
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(long)mtabp->mtab_time, mtabp->mtab_host,
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mtabp->mtab_dirp);
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if (verbose)
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warnx("write mounttab entry %s:%s",
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mtabp->mtab_host, mtabp->mtab_dirp);
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line++;
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}
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fclose(mtabfile);
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if (line == 0) {
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if (unlink(PATH_MOUNTTAB) == -1) {
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syslog(LOG_ERR, "can't remove %s", PATH_MOUNTTAB);
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return (0);
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}
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}
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return (1);
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}
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/*
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* Mark the entries as clean where RPC calls have been done successfully.
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*/
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void
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clean_mtab(char *hostp, char *dirp, int verbose) {
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struct mtablist *mtabp;
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char *host;
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/* Copy hostp in case it points to an entry that we are zeroing out. */
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host = strdup(hostp);
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for (mtabp = mtabhead; mtabp != NULL; mtabp = mtabp->mtab_next) {
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if (strcmp(mtabp->mtab_host, host) != 0)
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continue;
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if (dirp != NULL && strcmp(mtabp->mtab_dirp, dirp) != 0)
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continue;
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if (verbose)
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warnx("delete mounttab entry%s %s:%s",
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(dirp == NULL) ? " by host" : "",
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mtabp->mtab_host, mtabp->mtab_dirp);
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bzero(mtabp->mtab_host, RPCMNT_NAMELEN);
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}
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free(host);
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}
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/*
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* Free struct mtablist mtab.
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*/
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void
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free_mtab() {
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struct mtablist *mtabp;
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while ((mtabp = mtabhead) != NULL) {
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mtabhead = mtabhead->mtab_next;
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free(mtabp);
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}
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}
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/*
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* Print bad lines to syslog.
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*/
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static void
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badline(char *field, char *bad) {
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syslog(LOG_ERR, "bad mounttab %s field '%s'", field,
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(bad == NULL) ? "<null>" : bad);
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}
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