NetBSD/sbin/mount_portal/mount_portal.c

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/* $NetBSD: mount_portal.c,v 1.15 1999/08/16 06:34:50 bgrayson Exp $ */
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/*
* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated to Berkeley by
* Jan-Simon Pendry.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1992, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
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static char sccsid[] = "@(#)mount_portal.c 8.6 (Berkeley) 4/26/95";
#else
__RCSID("$NetBSD: mount_portal.c,v 1.15 1999/08/16 06:34:50 bgrayson Exp $");
#endif
#endif /* not lint */
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#include <sys/param.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <sys/syslog.h>
#include <sys/time.h>
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#include <sys/mount.h>
#include <err.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mntopts.h"
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#include "pathnames.h"
#include "portald.h"
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const struct mntopt mopts[] = {
MOPT_STDOPTS,
{ NULL }
};
static char *mountpt; /* made available to signal handler */
int main __P((int, char *[]));
static void sigchld __P((int));
static void sighup __P((int));
static void sigterm __P((int));
static void usage __P((void));
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static sig_atomic_t readcf; /* Set when SIGHUP received */
static void
sigchld(sig)
int sig;
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{
pid_t pid;
while ((pid = waitpid((pid_t) -1, (int *) 0, WNOHANG)) > 0)
;
if (pid < 0 && errno != ECHILD)
syslog(LOG_WARNING, "waitpid: %m");
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}
static void
sighup(sig)
int sig;
{
readcf = 1;
}
static void
sigterm(sig)
int sig;
{
if (unmount(mountpt, MNT_FORCE) < 0)
syslog(LOG_WARNING, "sigterm: unmounting %s failed: %m",
mountpt);
}
int
main(argc, argv)
int argc;
char *argv[];
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{
struct portal_args args;
struct sockaddr_un un;
char *conf;
int mntflags = 0;
char tag[32];
qelem q;
int rc;
int so;
int error = 0;
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/*
* Crack command line args
*/
int ch;
while ((ch = getopt(argc, argv, "o:")) != -1) {
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switch (ch) {
case 'o':
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getmntopts(optarg, mopts, &mntflags, 0);
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break;
default:
error = 1;
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break;
}
}
if (optind != (argc - 2))
error = 1;
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if (error)
usage();
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/*
* Get config file and mount point
*/
conf = argv[optind];
mountpt = argv[optind+1];
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/*
* If configuration file is not specified with an
* absolute pathname, complain and die. We want to
* check for this before we call daemon() and lose
* access to stderr.
*/
if (conf[0] != '/') {
errx(-1, "Error: the configuration file must be specified as an\n"
"absolute path, as the daemon chdir's to / immediately.\n");
}
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/*
* Construct the listening socket
*/
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un.sun_family = AF_LOCAL;
if (sizeof(_PATH_TMPPORTAL) >= sizeof(un.sun_path))
errx(1, "portal socket name too long");
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strcpy(un.sun_path, _PATH_TMPPORTAL);
mktemp(un.sun_path);
un.sun_len = strlen(un.sun_path);
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so = socket(AF_LOCAL, SOCK_STREAM, 0);
if (so < 0)
err(1, "socket");
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(void) unlink(un.sun_path);
if (bind(so, (struct sockaddr *) &un, sizeof(un)) < 0)
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err(1, "bind() call");
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(void) unlink(un.sun_path);
(void) listen(so, 5);
args.pa_socket = so;
sprintf(tag, "portal:%d", getpid() + 1);
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args.pa_config = tag;
rc = mount(MOUNT_PORTAL, mountpt, mntflags, &args);
if (rc < 0)
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err(1, "mount attempt on %s", mountpt);
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/*
* Everything is ready to go - now is a good time to fork
*/
#ifndef DEBUG
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daemon(0, 0);
#else
daemon(0, 1); /* Keep stderr around. */
#endif
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/*
* Start logging (and change name)
*/
openlog("portald", LOG_CONS|LOG_PID, LOG_DAEMON);
q.q_forw = q.q_back = &q;
readcf = 1;
signal(SIGCHLD, sigchld);
signal(SIGHUP, sighup);
signal(SIGTERM, sigterm);
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/*
* Just loop waiting for new connections and activating them
*/
for (;;) {
struct sockaddr_un un2;
int len2 = sizeof(un2);
int so2;
pid_t pid;
fd_set fdset;
int rc;
/*
* Check whether we need to re-read the configuration file
*/
if (readcf) {
readcf = 0;
conf_read(&q, conf);
continue;
}
/*
* Accept a new connection
* Will get EINTR if a signal has arrived, so just
* ignore that error code
*/
FD_ZERO(&fdset);
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FD_SET(so, &fdset);
rc = select(so+1, &fdset, (fd_set *)0, (fd_set *)0,
(struct timeval *)0);
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if (rc < 0) {
if (errno == EINTR)
continue;
syslog(LOG_ERR, "select: %m");
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exit(1);
}
if (rc == 0)
break;
so2 = accept(so, (struct sockaddr *) &un2, &len2);
if (so2 < 0) {
/*
* The unmount function does a shutdown on the socket
* which will generated ECONNABORTED on the accept.
*/
if (errno == ECONNABORTED)
break;
if (errno != EINTR) {
syslog(LOG_ERR, "accept: %m");
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exit(1);
}
continue;
}
/*
* Now fork a new child to deal with the connection
*/
eagain:;
switch (pid = fork()) {
case -1:
if (errno == EAGAIN) {
sleep(1);
goto eagain;
}
syslog(LOG_ERR, "fork: %m");
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break;
case 0:
(void) close(so);
activate(&q, so2);
exit(0);
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default:
(void) close(so2);
break;
}
}
syslog(LOG_INFO, "%s unmounted", mountpt);
exit(0);
}
static void
usage()
{
(void)fprintf(stderr,
"usage: mount_portal [-o options] config mount-point\n");
exit(1);
}