280 lines
6.1 KiB
C
280 lines
6.1 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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* 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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#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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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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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