526ba6d32b
remove all the code which was trying to do so. This code was nasty in several ways, it was hiding the kernel bug where the kernel was unable to properly load a module, and it was quitting if it wasn't able to load the module. The consequence is that an ABI breakage of the vfsconf API would have broken *every* mount utility.
285 lines
6.3 KiB
C
285 lines
6.3 KiB
C
/*
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1992, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)mount_portal.c 8.6 (Berkeley) 4/26/95";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/wait.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/stat.h>
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#include <sys/syslog.h>
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#include <sys/mount.h>
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#include <err.h>
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#include <errno.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 <sysexits.h>
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#include <unistd.h>
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#include "mntopts.h"
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#include "pathnames.h"
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#include "portald.h"
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struct mntopt mopts[] = {
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MOPT_STDOPTS,
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{ NULL }
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};
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static void usage(void) __dead2;
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static sig_atomic_t readcf; /* Set when SIGHUP received */
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static void sighup(sig)
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int sig;
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{
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readcf ++;
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}
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static void sigchld(sig)
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int sig;
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{
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pid_t pid;
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while ((pid = waitpid((pid_t) -1, (int *) 0, WNOHANG)) > 0)
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;
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/* wrtp - waitpid _doesn't_ return 0 when no children! */
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#ifdef notdef
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if (pid < 0 && errno != ECHILD)
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syslog(LOG_WARNING, "waitpid: %s", strerror(errno));
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#endif
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}
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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struct portal_args args;
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struct sockaddr_un un;
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char *conf;
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char mountpt[MAXPATHLEN];
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int mntflags = 0;
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char tag[32];
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mode_t um;
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qelem q;
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int rc;
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int so;
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int error = 0;
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/*
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* Crack command line args
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*/
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int ch;
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while ((ch = getopt(argc, argv, "o:")) != -1) {
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switch (ch) {
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case 'o':
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getmntopts(optarg, mopts, &mntflags, 0);
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break;
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default:
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error = 1;
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break;
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}
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}
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if (optind != (argc - 2))
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error = 1;
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if (error)
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usage();
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/*
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* Get config file and mount point
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*/
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conf = argv[optind];
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/* resolve the mountpoint with realpath(3) */
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(void)checkpath(argv[optind+1], mountpt);
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/*
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* Construct the listening socket
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*/
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un.sun_family = AF_UNIX;
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if (sizeof(_PATH_TMPPORTAL) >= sizeof(un.sun_path)) {
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errx(EX_SOFTWARE, "portal socket name too long");
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}
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strcpy(un.sun_path, _PATH_TMPPORTAL);
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mktemp(un.sun_path);
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un.sun_len = strlen(un.sun_path);
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so = socket(AF_UNIX, SOCK_STREAM, 0);
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if (so < 0) {
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err(EX_OSERR, "socket");
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}
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um = umask(077);
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(void) unlink(un.sun_path);
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if (bind(so, (struct sockaddr *) &un, sizeof(un)) < 0)
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err(1, NULL);
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(void) unlink(un.sun_path);
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(void) umask(um);
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(void) listen(so, 5);
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args.pa_socket = so;
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sprintf(tag, "portal:%d", getpid());
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args.pa_config = tag;
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rc = mount("portalfs", mountpt, mntflags, &args);
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if (rc < 0)
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err(1, NULL);
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/*
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* Everything is ready to go - now is a good time to fork
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*/
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#ifndef DEBUG
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daemon(0, 0);
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#endif
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/*
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* Start logging (and change name)
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*/
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openlog("portald", LOG_CONS|LOG_PID, LOG_DAEMON);
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q.q_forw = q.q_back = &q;
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readcf = 1;
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signal(SIGCHLD, sigchld);
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signal(SIGHUP, sighup);
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/*
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* Just loop waiting for new connections and activating them
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*/
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for (;;) {
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struct sockaddr_un un2;
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int len2 = sizeof(un2);
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int so2;
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pid_t pid;
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fd_set fdset;
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int rc;
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/*
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* Check whether we need to re-read the configuration file
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*/
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if (readcf) {
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#ifdef DEBUG
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printf ("re-reading configuration file\n");
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#endif
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readcf = 0;
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conf_read(&q, conf);
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continue;
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}
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/*
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* Accept a new connection
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* Will get EINTR if a signal has arrived, so just
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* ignore that error code
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*/
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FD_ZERO(&fdset);
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FD_SET(so, &fdset);
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rc = select(so+1, &fdset, (fd_set *) 0, (fd_set *) 0, (struct timeval *) 0);
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if (rc < 0) {
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if (errno == EINTR)
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continue;
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syslog(LOG_ERR, "select: %s", strerror(errno));
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exit(EX_OSERR);
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}
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if (rc == 0)
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break;
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so2 = accept(so, (struct sockaddr *) &un2, &len2);
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if (so2 < 0) {
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/*
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* The unmount function does a shutdown on the socket
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* which will generated ECONNABORTED on the accept.
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*/
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if (errno == ECONNABORTED)
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break;
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if (errno != EINTR) {
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syslog(LOG_ERR, "accept: %s", strerror(errno));
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exit(EX_OSERR);
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}
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continue;
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}
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/*
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* Now fork a new child to deal with the connection
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*/
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eagain:;
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switch (pid = fork()) {
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case -1:
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if (errno == EAGAIN) {
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sleep(1);
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goto eagain;
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}
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syslog(LOG_ERR, "fork: %s", strerror(errno));
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break;
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case 0:
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(void) close(so);
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activate(&q, so2);
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exit(0);
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default:
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(void) close(so2);
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break;
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}
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}
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syslog(LOG_INFO, "%s unmounted", mountpt);
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exit(0);
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}
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static void
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usage()
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{
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(void)fprintf(stderr,
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"usage: mount_portalfs [-o options] config mount-point\n");
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exit(EX_USAGE);
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}
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