260 lines
6.7 KiB
C
260 lines
6.7 KiB
C
/*-
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* Copyright (c) 2007 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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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 AUTHORS 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 AUTHORS 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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <libutil.h>
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#include <assert.h>
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#include <pathnames.h> /* _PATH_MOUNTDPID */
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#include <fsshare.h>
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#define FILE_HEADER "# !!! DO NOT EDIT THIS FILE MANUALLY !!!\n\n"
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#define OPTSSIZE 1024
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#define MAXLINESIZE (PATH_MAX + OPTSSIZE)
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static void
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restart_mountd(void)
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{
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struct pidfh *pfh;
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pid_t mountdpid;
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pfh = pidfile_open(_PATH_MOUNTDPID, 0600, &mountdpid);
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if (pfh != NULL) {
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/* Mountd is not running. */
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pidfile_remove(pfh);
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return;
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}
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if (errno != EEXIST) {
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/* Cannot open pidfile for some reason. */
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return;
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}
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/* We have mountd(8) PID in mountdpid varible. */
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kill(mountdpid, SIGHUP);
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}
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/*
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* Read one line from a file. Skip comments, empty lines and a line with a
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* mountpoint specified in the 'skip' argument.
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*/
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static char *
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getline(FILE *fd, const char *skip)
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{
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static char line[MAXLINESIZE];
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size_t len, skiplen;
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char *s, last;
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if (skip != NULL)
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skiplen = strlen(skip);
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for (;;) {
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s = fgets(line, sizeof(line), fd);
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if (s == NULL)
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return (NULL);
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/* Skip empty lines and comments. */
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if (line[0] == '\n' || line[0] == '#')
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continue;
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len = strlen(line);
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if (line[len - 1] == '\n')
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line[len - 1] = '\0';
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last = line[skiplen];
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/* Skip the given mountpoint. */
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if (skip != NULL && strncmp(skip, line, skiplen) == 0 &&
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(last == '\t' || last == ' ' || last == '\0')) {
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continue;
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}
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break;
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}
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return (line);
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}
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/*
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* Function translate options to a format acceptable by exports(5), eg.
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*
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* -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 freefall.freebsd.org 69.147.83.54
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*
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* Accepted input formats:
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*
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* ro,network=192.168.0.0,mask=255.255.255.0,maproot=0,freefall.freebsd.org
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* ro network=192.168.0.0 mask=255.255.255.0 maproot=0 freefall.freebsd.org
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* -ro,-network=192.168.0.0,-mask=255.255.255.0,-maproot=0,freefall.freebsd.org
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* -ro -network=192.168.0.0 -mask=255.255.255.0 -maproot=0 freefall.freebsd.org
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*
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* Recognized keywords:
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*
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* ro, maproot, mapall, mask, network, alldirs, public, webnfs, index, quiet
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*
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*/
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static const char *known_opts[] = { "ro", "maproot", "mapall", "mask",
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"network", "alldirs", "public", "webnfs", "index", "quiet", NULL };
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static char *
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translate_opts(const char *shareopts)
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{
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static char newopts[OPTSSIZE];
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char oldopts[OPTSSIZE];
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char *o, *s = NULL;
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unsigned int i;
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size_t len;
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strlcpy(oldopts, shareopts, sizeof(oldopts));
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newopts[0] = '\0';
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s = oldopts;
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while ((o = strsep(&s, "-, ")) != NULL) {
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if (o[0] == '\0')
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continue;
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for (i = 0; known_opts[i] != NULL; i++) {
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len = strlen(known_opts[i]);
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if (strncmp(known_opts[i], o, len) == 0 &&
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(o[len] == '\0' || o[len] == '=')) {
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strlcat(newopts, "-", sizeof(newopts));
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break;
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}
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}
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strlcat(newopts, o, sizeof(newopts));
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strlcat(newopts, " ", sizeof(newopts));
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}
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return (newopts);
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}
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static int
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fsshare_main(const char *file, const char *mountpoint, const char *shareopts,
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int share)
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{
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char tmpfile[PATH_MAX];
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char *line;
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FILE *newfd, *oldfd;
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int fd, error;
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newfd = oldfd = NULL;
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error = 0;
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/*
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* Create temporary file in the same directory, so we can atomically
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* rename it.
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*/
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if (strlcpy(tmpfile, file, sizeof(tmpfile)) >= sizeof(tmpfile))
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return (ENAMETOOLONG);
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if (strlcat(tmpfile, ".XXXXXXXX", sizeof(tmpfile)) >= sizeof(tmpfile))
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return (ENAMETOOLONG);
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fd = mkstemp(tmpfile);
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if (fd == -1)
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return (errno);
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/*
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* File name is random, so we don't really need file lock now, but it
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* will be needed after rename(2).
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*/
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error = flock(fd, LOCK_EX);
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assert(error == 0 || (error == -1 && errno == EOPNOTSUPP));
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newfd = fdopen(fd, "r+");
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assert(newfd != NULL);
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/* Open old exports file. */
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oldfd = fopen(file, "r");
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if (oldfd == NULL) {
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if (share) {
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if (errno != ENOENT) {
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error = errno;
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goto out;
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}
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} else {
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/* If there is no exports file, ignore the error. */
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if (errno == ENOENT)
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errno = 0;
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error = errno;
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goto out;
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}
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} else {
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error = flock(fileno(oldfd), LOCK_EX);
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assert(error == 0 || (error == -1 && errno == EOPNOTSUPP));
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error = 0;
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}
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/* Place big, fat warning at the begining of the file. */
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fprintf(newfd, "%s", FILE_HEADER);
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while (oldfd != NULL && (line = getline(oldfd, mountpoint)) != NULL)
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fprintf(newfd, "%s\n", line);
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if (oldfd != NULL && ferror(oldfd) != 0) {
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error = ferror(oldfd);
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goto out;
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}
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if (ferror(newfd) != 0) {
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error = ferror(newfd);
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goto out;
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}
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if (share) {
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fprintf(newfd, "%s\t%s\n", mountpoint,
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translate_opts(shareopts));
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}
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out:
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if (error != 0)
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unlink(tmpfile);
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else {
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if (rename(tmpfile, file) == -1) {
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error = errno;
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unlink(tmpfile);
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} else {
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/*
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* Send SIGHUP to mountd, but unlock exports file later.
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*/
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restart_mountd();
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}
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}
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if (oldfd != NULL) {
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flock(fileno(oldfd), LOCK_UN);
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fclose(oldfd);
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}
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if (newfd != NULL) {
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flock(fileno(newfd), LOCK_UN);
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fclose(newfd);
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}
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return (error);
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}
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/*
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* Add the given mountpoint to the given exports file.
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*/
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int
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fsshare(const char *file, const char *mountpoint, const char *shareopts)
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{
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return (fsshare_main(file, mountpoint, shareopts, 1));
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}
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/*
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* Remove the given mountpoint from the given exports file.
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*/
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int
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fsunshare(const char *file, const char *mountpoint)
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{
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return (fsshare_main(file, mountpoint, NULL, 0));
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}
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