313 lines
7.1 KiB
C
313 lines
7.1 KiB
C
/* $NetBSD: mount_portal.c,v 1.25 2003/08/07 10:04:30 agc Exp $ */
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/*
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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. 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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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) 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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#else
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__RCSID("$NetBSD: mount_portal.c,v 1.25 2003/08/07 10:04:30 agc Exp $");
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#endif
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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/syslog.h>
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#include <sys/time.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 <poll.h>
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#include <signal.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 <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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static const struct mntopt mopts[] = {
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MOPT_STDOPTS,
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MOPT_GETARGS,
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{ NULL }
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};
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static const char *mountpt; /* made available to signal handler */
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int main __P((int, char *[]));
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static void sigchld __P((int));
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static void sighup __P((int));
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static void sigterm __P((int));
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static void usage __P((void));
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static sig_atomic_t readcf; /* Set when SIGHUP received */
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static void
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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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if (pid < 0 && errno != ECHILD)
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syslog(LOG_WARNING, "waitpid: %m");
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}
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static void
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sighup(sig)
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int sig;
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{
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readcf = 1;
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}
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static void
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sigterm(sig)
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int sig;
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{
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if (unmount(mountpt, MNT_FORCE) < 0)
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syslog(LOG_WARNING, "sigterm: unmounting %s failed: %m",
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mountpt);
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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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int mntflags = 0;
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char tag[32];
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char tmpdir[PATH_MAX];
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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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mountpt = argv[optind+1];
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/*
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* If configuration file is not specified with an
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* absolute pathname, complain and die. We want to
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* check for this before we call daemon() and lose
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* access to stderr.
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*/
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if (conf[0] != '/') {
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errx(-1, "Error: the configuration file must be specified as an\n"
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"absolute path, as the daemon chdir's to / immediately.");
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}
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/*
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* Construct the listening socket
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*/
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un.sun_family = AF_LOCAL;
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strlcpy(tmpdir, _PATH_TMPPORTAL, sizeof(tmpdir));
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mkdtemp(tmpdir);
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un.sun_len = snprintf(un.sun_path, sizeof(un.sun_path),
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"%s/%s", tmpdir, _PATH_PORTAL_FILE);
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if (un.sun_len >= sizeof(un.sun_path))
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errx(1, "portal socket name too long");
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so = socket(AF_LOCAL, SOCK_STREAM, 0);
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if (so < 0)
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err(1, "socket");
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if (bind(so, (struct sockaddr *) &un, sizeof(un)) < 0)
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err(1, "bind() call");
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/* path no longer needed */
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(void) unlink(un.sun_path);
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if (rmdir(tmpdir) != 0)
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warn("failed to rmdir(%s)", tmpdir);
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(void) listen(so, 5);
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/*
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* Now it's good time to fork - all but the actual mount(2)
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* call is performed, and we need the new pid to fill in
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* the tag contents correctly. Since we need to print error message
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* in case mount(2) fails or DEBUG case, we don't let daemon(3) to
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* close the standard streams and handle them on our own later.
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*/
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daemon(0, 1);
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args.pa_socket = so;
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snprintf(tag, sizeof(tag), "portal:%d", getpid());
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args.pa_config = tag;
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rc = mount(MOUNT_PORTAL, mountpt, mntflags, &args);
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if (rc < 0)
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err(1, "mount attempt on %s", mountpt);
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/* mount(2) call succeeded, redirect standard streams to /dev/null */
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freopen("/dev/null", "r", stdin);
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freopen("/dev/null", "w", stdout);
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#ifndef DEBUG
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freopen("/dev/null", "w", stderr);
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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_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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signal(SIGTERM, sigterm);
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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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struct pollfd fdset[1];
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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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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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fdset[0].fd = so;
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fdset[0].events = POLLIN;
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rc = poll(fdset, 1, INFTIM);
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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, "poll: %m");
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exit(1);
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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: %m");
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exit(1);
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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_WARNING, "fork: %m");
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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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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_portal [-o options] config mount-point\n");
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exit(1);
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}
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