diff options
Diffstat (limited to 'usr.sbin/rpc.umntall/mounttab.c')
| -rw-r--r-- | usr.sbin/rpc.umntall/mounttab.c | 230 |
1 files changed, 230 insertions, 0 deletions
diff --git a/usr.sbin/rpc.umntall/mounttab.c b/usr.sbin/rpc.umntall/mounttab.c new file mode 100644 index 000000000000..0043d4302e59 --- /dev/null +++ b/usr.sbin/rpc.umntall/mounttab.c @@ -0,0 +1,230 @@ +/*- + * SPDX-License-Identifier: BSD-2-Clause + * + * 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> +#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); +} |