/* $NetBSD: mount_portal.c,v 1.32 2007/07/16 17:06:54 pooka Exp $ */ /* * Copyright (c) 1992, 1993, 1994 * 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. 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 #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 static char sccsid[] = "@(#)mount_portal.c 8.6 (Berkeley) 4/26/95"; #else __RCSID("$NetBSD: mount_portal.c,v 1.32 2007/07/16 17:06:54 pooka Exp $"); #endif #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pathnames.h" #include "portald.h" static const struct mntopt mopts[] = { MOPT_STDOPTS, MOPT_GETARGS, MOPT_NULL, }; static char mountpt[MAXPATHLEN]; /* made available to signal handler */ static void sigchld(int); static void sighup(int); static void sigterm(int); static void usage(void); static sig_atomic_t readcf; /* Set when SIGHUP received */ static void sigchld(int sig) { pid_t pid; while ((pid = waitpid((pid_t) -1, (int *) 0, WNOHANG)) > 0) ; if (pid < 0 && errno != ECHILD) syslog(LOG_WARNING, "waitpid: %m"); } static void sighup(int sig) { readcf = 1; } static void sigterm(int sig) { if (unmount(mountpt, MNT_FORCE) < 0) syslog(LOG_WARNING, "sigterm: unmounting %s failed: %m", mountpt); } int main(int argc, char *argv[]) { struct portal_args args; struct sockaddr_un un; char *conf; int mntflags = 0; char tag[32]; char tmpdir[PATH_MAX]; mntoptparse_t mp; qelem q; int rc; int so; int error = 0; /* * Crack command line args */ int ch; while ((ch = getopt(argc, argv, "o:")) != -1) { switch (ch) { case 'o': mp = getmntopts(optarg, mopts, &mntflags, 0); if (mp == NULL) err(1, "getmntopts"); freemntopts(mp); break; default: error = 1; break; } } if (optind != (argc - 2)) error = 1; if (error) usage(); /* * Get config file and mount point */ conf = argv[optind]; if (realpath(argv[optind+1], mountpt) == NULL) /* Check device path */ err(1, "realpath %s", argv[optind+1]); if (strncmp(argv[optind+1], mountpt, MAXPATHLEN)) { warnx("\"%s\" is a relative path.", argv[optind+1]); warnx("using \"%s\" instead.", mountpt); } /* * 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."); } /* * Construct the listening socket */ un.sun_family = AF_LOCAL; strlcpy(tmpdir, _PATH_TMPPORTAL, sizeof(tmpdir)); mkdtemp(tmpdir); un.sun_len = snprintf(un.sun_path, sizeof(un.sun_path), "%s/%s", tmpdir, _PATH_PORTAL_FILE); if (un.sun_len >= sizeof(un.sun_path)) errx(1, "portal socket name too long"); so = socket(AF_LOCAL, SOCK_STREAM, 0); if (so < 0) err(1, "socket"); if (bind(so, (struct sockaddr *) &un, sizeof(un)) < 0) err(1, "bind() call"); /* path no longer needed */ (void) unlink(un.sun_path); if (rmdir(tmpdir) != 0) warn("failed to rmdir(%s)", tmpdir); (void) listen(so, 5); /* * Now it's good time to fork - all but the actual mount(2) * call is performed, and we need the new pid to fill in * the tag contents correctly. Since we need to print error message * in case mount(2) fails or DEBUG case, we don't let daemon(3) to * close the standard streams and handle them on our own later. */ daemon(0, 1); args.pa_socket = so; snprintf(tag, sizeof(tag), "portal:%d", getpid()); args.pa_config = tag; rc = mount(MOUNT_PORTAL, mountpt, mntflags, &args, sizeof args); if (rc == -1) err(1, "mount attempt on %s", mountpt); /* mount(2) call succeeded, redirect standard streams to /dev/null */ freopen("/dev/null", "r", stdin); freopen("/dev/null", "w", stdout); #ifndef DEBUG freopen("/dev/null", "w", stderr); #endif /* * Start logging (and change name) */ openlog("portald", LOG_PID, LOG_DAEMON); q.q_forw = q.q_back = &q; readcf = 1; signal(SIGCHLD, sigchld); signal(SIGHUP, sighup); signal(SIGTERM, sigterm); /* * Just loop waiting for new connections and activating them */ for (;;) { struct sockaddr_un un2; socklen_t len2 = sizeof(un2); int so2; pid_t pid; struct pollfd fdset[1]; /* * 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 */ fdset[0].fd = so; fdset[0].events = POLLIN; rc = poll(fdset, 1, INFTIM); if (rc < 0) { if (errno == EINTR) continue; syslog(LOG_ERR, "poll: %m"); 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"); 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_WARNING, "fork: %m"); break; case 0: (void) close(so); activate(&q, so2); exit(0); default: (void) close(so2); break; } } exit(0); } static void usage(void) { (void)fprintf(stderr, "usage: mount_portal [-o options] config mount-point\n"); exit(1); }