/* * 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. 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. * * @(#) Copyright (c) 1992, 1993, 1994 The Regents of the University of California. All rights reserved. * @(#)mount_portal.c 8.6 (Berkeley) 4/26/95 * $FreeBSD: src/sbin/mount_portal/mount_portal.c,v 1.16 1999/10/09 11:54:11 phk Exp $ * $DragonFly: src/sbin/mount_portal/mount_portal.c,v 1.6 2005/11/06 12:36:40 swildner Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "mntopts.h" #include "pathnames.h" #include "portald.h" struct mntopt mopts[] = { MOPT_STDOPTS, { NULL, 0, 0, 0 } }; static void usage(void) __dead2; static sig_atomic_t readcf; /* Set when SIGHUP received */ static void sighup(int sig __unused) { readcf ++; } static void sigchld(int sig __unused) { pid_t pid; while ((pid = waitpid((pid_t) -1, NULL, WNOHANG)) > 0) ; /* wrtp - waitpid _doesn't_ return 0 when no children! */ #ifdef notdef if (pid < 0 && errno != ECHILD) syslog(LOG_WARNING, "waitpid: %s", strerror(errno)); #endif } int main(int argc, char **argv) { struct portal_args args; struct sockaddr_un un; char *conf; char mountpt[MAXPATHLEN]; int mntflags = 0; char tag[32]; struct vfsconf vfc; mode_t um; 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': getmntopts(optarg, mopts, &mntflags, 0); break; default: error = 1; break; } } if (optind != (argc - 2)) error = 1; if (error) usage(); /* * Get config file and mount point */ conf = argv[optind]; /* resolve the mountpoint with realpath(3) */ checkpath(argv[optind+1], mountpt); /* * Construct the listening socket */ un.sun_family = AF_UNIX; if (sizeof(_PATH_TMPPORTAL) >= sizeof(un.sun_path)) { errx(EX_SOFTWARE, "portal socket name too long"); } strcpy(un.sun_path, _PATH_TMPPORTAL); mktemp(un.sun_path); un.sun_len = strlen(un.sun_path); so = socket(AF_UNIX, SOCK_STREAM, 0); if (so < 0) { err(EX_OSERR, "socket"); } um = umask(077); unlink(un.sun_path); if (bind(so, (struct sockaddr *) &un, sizeof(un)) < 0) err(1, NULL); unlink(un.sun_path); umask(um); listen(so, 5); args.pa_socket = so; sprintf(tag, "portal:%d", getpid()); args.pa_config = tag; error = getvfsbyname("portal", &vfc); if (error && vfsisloadable("portal")) { if (vfsload("portal")) err(EX_OSERR, "vfsload(portal)"); endvfsent(); error = getvfsbyname("portal", &vfc); } if (error) errx(EX_OSERR, "portal filesystem is not available"); rc = mount(vfc.vfc_name, mountpt, mntflags, &args); if (rc < 0) err(1, NULL); /* * Everything is ready to go - now is a good time to fork */ #ifndef DEBUG daemon(0, 0); #endif /* * 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); /* * 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; /* * Check whether we need to re-read the configuration file */ if (readcf) { #ifdef DEBUG printf ("re-reading configuration file\n"); #endif 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); FD_SET(so, &fdset); rc = select(so+1, &fdset, NULL, NULL, NULL); if (rc < 0) { if (errno == EINTR) continue; syslog(LOG_ERR, "select: %s", strerror(errno)); exit(EX_OSERR); } 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: %s", strerror(errno)); exit(EX_OSERR); } 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: %s", strerror(errno)); break; case 0: close(so); activate(&q, so2); exit(0); default: 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(EX_USAGE); }