/* $NetBSD: hlfsd.c,v 1.3 2015/01/17 17:46:31 christos Exp $ */ /* * Copyright (c) 1997-2014 Erez Zadok * Copyright (c) 1989 Jan-Simon Pendry * Copyright (c) 1989 Imperial College of Science, Technology & Medicine * Copyright (c) 1989 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry at Imperial College, London. * * 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. * * * File: am-utils/hlfsd/hlfsd.c * * HLFSD was written at Columbia University Computer Science Department, by * Erez Zadok and Alexander Dupuy * It is being distributed under the same terms and conditions as amd does. */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include /* * STATIC VARIABLES: */ static RETSIGTYPE proceed(int); static RETSIGTYPE reaper(int); static RETSIGTYPE reload(int); static char *hlfs_group = DEFAULT_HLFS_GROUP; static char default_dir_name[] = DEFAULT_DIRNAME; static char *dir_name = default_dir_name; static int printpid = 0; static int stoplight = 0; static void hlfsd_init(void); static void usage(void); static struct itimerval reloadinterval = { {DEFAULT_INTERVAL, 0}, {DEFAULT_INTERVAL, 0} }; /* * default mount options. */ static char default_mntopts[] = "ro,noac"; /* * GLOBALS: */ SVCXPRT *nfsxprt; char *alt_spooldir = ALT_SPOOLDIR; char *home_subdir = HOME_SUBDIR; char *logfile = DEFAULT_LOGFILE; char *passwdfile = NULL; /* alternate passwd file to use */ char *slinkname = NULL; char hostname[MAXHOSTNAMELEN + 1] = "localhost"; u_int cache_interval = DEFAULT_CACHE_INTERVAL; gid_t hlfs_gid = (gid_t) INVALIDID; int masterpid = 0; int noverify = 0; int orig_umask = 022; int serverpid = 0; nfstime startup; u_short nfs_port; /* symbol must be available always */ #ifdef MNTTAB_FILE_NAME char *mnttab_file_name = MNTTAB_FILE_NAME; #else /* not MNTTAB_FILE_NAME */ char *mnttab_file_name = NULL; #endif /* not MNTTAB_FILE_NAME */ /* forward declarations */ void hlfsd_going_down(int rc); void fatalerror(char *str); static void usage(void) { fprintf(stderr, "Usage: %s [-Cfhnpv] [-a altdir] [-c cache-interval] [-g group]\n", am_get_progname()); fprintf(stderr, "\t[-i interval] [-l logfile] [-o mntopts] [-P passwdfile]\n"); show_opts('x', xlog_opt); #ifdef DEBUG show_opts('D', dbg_opt); #endif /* DEBUG */ fprintf(stderr, "\t[dir_name [subdir]]\n"); exit(2); } void fatalerror(char *str) { #define ERRM ": %m" size_t l = strlen(str) + sizeof(ERRM) - 1; char *tmp = strnsave(str, l); xstrlcat(tmp, ERRM, l); fatal(tmp); } int main(int argc, char *argv[]) { char *dot; char *mntopts = (char *) NULL; char hostpid_fs[MAXHOSTNAMELEN + 1 + 16]; /* room for ":(pid###)" */ char progpid_fs[PROGNAMESZ + 1 + 11]; /* room for ":pid" */ char preopts[128]; char *progname; int forcecache = 0; int forcefast = 0; int genflags = 0; int opt, ret; int opterrs = 0; int retry; int soNFS; /* NFS socket */ mntent_t mnt; nfs_args_t nfs_args; am_nfs_handle_t anh; struct dirent *direntry; struct group *grp; struct stat stmodes; DIR *mountdir; MTYPE_TYPE type = MOUNT_TYPE_NFS; #ifdef HAVE_SIGACTION struct sigaction sa; #endif /* not HAVE_SIGACTION */ #ifndef HAVE_TRANSPORT_TYPE_TLI struct sockaddr_in localsocket; #endif /* not HAVE_TRANSPORT_TYPE_TLI */ /* get program name and truncate so we don't overflow progpid_fs */ if ((progname = strrchr(argv[0], '/')) != NULL) progname++; else progname = argv[0]; if ((int) strlen(progname) > PROGNAMESZ) /* truncate to reasonable size */ progname[PROGNAMESZ] = '\0'; am_set_progname(progname); while ((opt = getopt(argc, argv, "a:c:CD:fg:hi:l:no:pP:x:v")) != -1) switch (opt) { case 'a': if (!optarg || optarg[0] != '/') { printf("%s: invalid directory for -a: %s\n", am_get_progname(), optarg); exit(3); } alt_spooldir = optarg; break; case 'c': if (!atoi(optarg)) { printf("%s: invalid interval for -c: %s\n", am_get_progname(), optarg); exit(3); } cache_interval = atoi(optarg); break; case 'C': forcecache++; break; case 'f': forcefast++; break; case 'g': hlfs_group = optarg; break; case 'i': if (!atoi(optarg)) { printf("%s: invalid interval for -i: %s\n", am_get_progname(), optarg); exit(3); } reloadinterval.it_interval.tv_sec = atoi(optarg); reloadinterval.it_value.tv_sec = atoi(optarg); break; case 'l': logfile = optarg; break; case 'n': noverify++; break; case 'o': mntopts = optarg; break; case 'p': printpid++; break; case 'P': passwdfile = optarg; break; case 'v': fprintf(stderr, "%s\n", HLFSD_VERSION); exit(0); case 'x': opterrs += switch_option(optarg); break; case 'D': #ifdef DEBUG opterrs += debug_option(optarg); #else /* not DEBUG */ fprintf(stderr, "%s: not compiled with DEBUG -- sorry.\n", am_get_progname()); #endif /* not DEBUG */ break; case 'h': case '?': opterrs++; } /* need my pid before any dlog/plog */ am_set_mypid(); #ifdef DEBUG switch_option("debug"); #endif /* DEBUG */ /* * Terminate if did not ask to forcecache (-C) and hlfsd would not be able * to set the minimum cache intervals. */ #if !defined(MNT2_NFS_OPT_ACREGMIN) && !defined(MNT2_NFS_OPT_NOAC) && !defined(HAVE_NFS_ARGS_T_ACREGMIN) if (!forcecache) { fprintf(stderr, "%s: will not be able to turn off attribute caches.\n", am_get_progname()); exit(1); } #endif /* !defined(MNT2_NFS_OPT_ACREGMIN) && !defined(MNT2_NFS_OPT_NOAC) && !defined(HAVE_NFS_ARGS_T_ACREGMIN) */ switch (argc - optind) { case 2: home_subdir = argv[optind + 1]; case 1: dir_name = argv[optind]; case 0: break; default: opterrs++; } if (opterrs) usage(); /* ensure that only root can run hlfsd */ if (geteuid()) { fprintf(stderr, "hlfsd can only be run as root\n"); exit(1); } setbuf(stdout, (char *) NULL); umask(0); /* find gid for hlfs_group */ if ((grp = getgrnam(hlfs_group)) == (struct group *) NULL) { fprintf(stderr, "%s: cannot get gid for group \"%s\".\n", am_get_progname(), hlfs_group); } else { hlfs_gid = grp->gr_gid; } /* get hostname for logging and open log before we reset umask */ if (gethostname(hostname, sizeof(hostname)) == -1) { fprintf(stderr, "%s: gethostname failed \"%s\".\n", am_get_progname(), strerror(errno)); exit(1); } hostname[sizeof(hostname) - 1] = '\0'; if ((dot = strchr(hostname, '.')) != NULL) *dot = '\0'; orig_umask = umask(0); if (logfile) switch_to_logfile(logfile, orig_umask, 0); #ifndef MOUNT_TABLE_ON_FILE if (amuDebug(D_MTAB)) dlog("-D mtab option ignored"); #endif /* not MOUNT_TABLE_ON_FILE */ /* avoid hanging on other NFS servers if started elsewhere */ if (chdir("/") < 0) fatal("cannot chdir to /: %m"); if (geteuid() != 0) fatal("must be root to mount filesystems"); /* * dir_name must match "^(/.*)/([^/]+)$", and is split at last '/' with * slinkname = `basename $dir_name` - requires dir_name be writable */ if (dir_name[0] != '/' || ((slinkname = strrchr(dir_name, '/')), *slinkname++ = '\0', (dir_name[0] == '\0' || slinkname[0] == '\0'))) { if (slinkname) *--slinkname = '/'; printf("%s: invalid mount directory/link %s\n", am_get_progname(), dir_name); exit(3); } if (!forcefast) { /* make sure mount point exists and is at least mode 555 */ if (stat(dir_name, &stmodes) < 0) if (errno != ENOENT || mkdirs(dir_name, 0555) < 0 || stat(dir_name, &stmodes) < 0) fatalerror(dir_name); if ((stmodes.st_mode & 0555) != 0555) { fprintf(stderr, "%s: directory %s not read/executable\n", am_get_progname(), dir_name); plog(XLOG_WARNING, "directory %s not read/executable", dir_name); } /* warn if extraneous stuff will be hidden by mount */ if ((mountdir = opendir(dir_name)) == NULL) fatalerror(dir_name); while ((direntry = readdir(mountdir)) != NULL) { if (!NSTREQ(".", direntry->d_name, NAMLEN(direntry)) && !NSTREQ("..", direntry->d_name, NAMLEN(direntry)) && !NSTREQ(slinkname, direntry->d_name, NAMLEN(direntry))) break; } if (direntry != NULL) { fprintf(stderr, "%s: %s/%s will be hidden by mount\n", am_get_progname(), dir_name, direntry->d_name); plog(XLOG_WARNING, "%s/%s will be hidden by mount\n", dir_name, direntry->d_name); } closedir(mountdir); /* make sure alternate spool dir exists */ if ((errno = mkdirs(alt_spooldir, OPEN_SPOOLMODE))) { fprintf(stderr, "%s: cannot create alternate dir ", am_get_progname()); perror(alt_spooldir); plog(XLOG_ERROR, "cannot create alternate dir %s: %m", alt_spooldir); } chmod(alt_spooldir, OPEN_SPOOLMODE); /* create failsafe link to alternate spool directory */ *(slinkname-1) = '/'; /* unsplit dir_name to include link */ if (lstat(dir_name, &stmodes) == 0 && (stmodes.st_mode & S_IFMT) != S_IFLNK) { fprintf(stderr, "%s: failsafe %s not a symlink\n", am_get_progname(), dir_name); plog(XLOG_WARNING, "failsafe %s not a symlink\n", dir_name); } else { unlink(dir_name); if (symlink(alt_spooldir, dir_name) < 0) { fprintf(stderr, "%s: cannot create failsafe symlink %s -> ", am_get_progname(), dir_name); perror(alt_spooldir); plog(XLOG_WARNING, "cannot create failsafe symlink %s -> %s: %m", dir_name, alt_spooldir); } } *(slinkname-1) = '\0'; /* resplit dir_name */ } /* end of "if (!forcefast) {" */ /* * Register hlfsd as an nfs service with the portmapper. */ ret = create_nfs_service(&soNFS, &nfs_port, &nfsxprt, nfs_program_2, NFS_VERSION); if (ret != 0) fatal("cannot create NFS service"); #ifdef HAVE_SIGACTION sa.sa_handler = proceed; sa.sa_flags = 0; sigemptyset(&(sa.sa_mask)); sigaddset(&(sa.sa_mask), SIGUSR2); sigaction(SIGUSR2, &sa, NULL); #else /* not HAVE_SIGACTION */ signal(SIGUSR2, proceed); #endif /* not HAVE_SIGACTION */ plog(XLOG_INFO, "Initializing hlfsd..."); hlfsd_init(); /* start up child (forking) to run svc_run */ #ifdef HAVE_SIGACTION sa.sa_handler = reaper; sa.sa_flags = 0; sigemptyset(&(sa.sa_mask)); sigaddset(&(sa.sa_mask), SIGCHLD); sigaction(SIGCHLD, &sa, NULL); #else /* not HAVE_SIGACTION */ signal(SIGCHLD, reaper); #endif /* not HAVE_SIGACTION */ /* * In the parent, if -D nodaemon, we don't need to * set this signal handler. */ if (amuDebug(D_DAEMON)) { while (stoplight != SIGUSR2) { plog(XLOG_INFO, "parent waits for child to setup (stoplight=%d)", stoplight); #ifdef HAVE_SIGSUSPEND { sigset_t mask; sigemptyset(&mask); (void)sigsuspend(&mask); /* wait for child to set up */ } #else /* not HAVE_SIGSUSPEND */ (void)sigpause(0); /* wait for child to set up */ #endif /* not HAVE_SIGSUSPEND */ sleep(1); } } /* * setup options to mount table (/etc/{mtab,mnttab}) entry */ xsnprintf(hostpid_fs, sizeof(hostpid_fs), "%s:(pid%d)", hostname, masterpid); memset((char *) &mnt, 0, sizeof(mnt)); mnt.mnt_dir = dir_name; /* i.e., "/mail" */ mnt.mnt_fsname = hostpid_fs; if (mntopts) { mnt.mnt_opts = mntopts; } else { xstrlcpy(preopts, default_mntopts, sizeof(preopts)); /* * Turn off all kinds of attribute and symlink caches as * much as possible. Also make sure that mount does not * show up to df. */ #ifdef MNTTAB_OPT_INTR xstrlcat(preopts, ",", sizeof(preopts)); xstrlcat(preopts, MNTTAB_OPT_INTR, sizeof(preopts)); #endif /* MNTTAB_OPT_INTR */ #ifdef MNTTAB_OPT_IGNORE xstrlcat(preopts, ",", sizeof(preopts)); xstrlcat(preopts, MNTTAB_OPT_IGNORE, sizeof(preopts)); #endif /* MNTTAB_OPT_IGNORE */ #ifdef MNT2_GEN_OPT_CACHE xstrlcat(preopts, ",nocache", sizeof(preopts)); #endif /* MNT2_GEN_OPT_CACHE */ #ifdef MNT2_NFS_OPT_SYMTTL xstrlcat(preopts, ",symttl=0", sizeof(preopts)); #endif /* MNT2_NFS_OPT_SYMTTL */ mnt.mnt_opts = preopts; } /* * Make sure that amd's top-level NFS mounts are hidden by default * from df. * If they don't appear to support the either the "ignore" mnttab * option entry, or the "auto" one, set the mount type to "nfs". */ #ifdef HIDE_MOUNT_TYPE mnt.mnt_type = HIDE_MOUNT_TYPE; #else /* not HIDE_MOUNT_TYPE */ mnt.mnt_type = "nfs"; #endif /* not HIDE_MOUNT_TYPE */ /* some systems don't have a mount type, but a mount flag */ #ifndef HAVE_TRANSPORT_TYPE_TLI amu_get_myaddress(&localsocket.sin_addr, NULL); localsocket.sin_family = AF_INET; localsocket.sin_port = htons(nfsxprt->xp_port); #endif /* not HAVE_TRANSPORT_TYPE_TLI */ /* * Update hostname field. * Make some name prog:pid (i.e., hlfsd:174) for hostname */ xsnprintf(progpid_fs, sizeof(progpid_fs), "%s:%d", am_get_progname(), masterpid); /* Most kernels have a name length restriction. */ if ((int) strlen(progpid_fs) >= (int) MAXHOSTNAMELEN) xstrlcpy(progpid_fs + MAXHOSTNAMELEN - 3, "..", sizeof(progpid_fs) - MAXHOSTNAMELEN + 3); genflags = compute_mount_flags(&mnt); retry = hasmntval(&mnt, MNTTAB_OPT_RETRY); if (retry <= 0) retry = 1; /* XXX */ memmove(&anh.v2, root_fhp, sizeof(*root_fhp)); #ifdef HAVE_TRANSPORT_TYPE_TLI compute_nfs_args(&nfs_args, &mnt, genflags, nfsncp, NULL, /* remote host IP addr is set below */ NFS_VERSION, /* version 2 */ "udp", /* XXX: shouldn't this be "udp"? */ &anh, progpid_fs, /* host name for kernel */ hostpid_fs); /* filesystem name for kernel */ /* * IMPORTANT: set the correct IP address AFTERWARDS. It cannot * be done using the normal mechanism of compute_nfs_args(), because * that one will allocate a new address and use NFS_SA_DREF() to copy * parts to it, while assuming that the ip_addr passed is always * a "struct sockaddr_in". That assumption is incorrect on TLI systems, * because they define a special macro HOST_SELF which is DIFFERENT * than localhost (127.0.0.1)! */ nfs_args.addr = &nfsxprt->xp_ltaddr; #else /* not HAVE_TRANSPORT_TYPE_TLI */ compute_nfs_args(&nfs_args, &mnt, genflags, NULL, &localsocket, NFS_VERSION, /* version 2 */ "udp", /* XXX: shouldn't this be "udp"? */ &anh, progpid_fs, /* host name for kernel */ hostpid_fs); /* filesystem name for kernel */ #endif /* not HAVE_TRANSPORT_TYPE_TLI */ /************************************************************************* * NOTE: while compute_nfs_args() works ok for regular NFS mounts * * the toplvl one is not, and so some options must be corrected by hand * * more carefully, *after* compute_nfs_args() runs. * *************************************************************************/ compute_automounter_nfs_args(&nfs_args, &mnt); /* * For some reason, this mount may have to be done in the background, if I am * using -D daemon. I suspect that the actual act of mounting requires * calling to hlfsd itself to invoke one or more of its nfs calls, to stat * /mail. That means that even if you say -D daemon, at least the mount * of hlfsd itself on top of /mail will be done in the background. * The other alternative I have is to run svc_run, but set a special * signal handler to perform the mount in N seconds via some alarm. * -Erez Zadok. */ if (!amuDebug(D_DAEMON)) { /* Normal case */ plog(XLOG_INFO, "normal NFS mounting hlfsd service points"); if (mount_fs(&mnt, genflags, (caddr_t) &nfs_args, retry, type, 0, NULL, mnttab_file_name, 0) < 0) fatal("nfsmount: %m"); } else { /* asked for -D daemon */ if (fork() == 0) { /* child runs mount */ am_set_mypid(); foreground = 0; plog(XLOG_INFO, "child NFS mounting hlfsd service points"); if (mount_fs(&mnt, genflags, (caddr_t) &nfs_args, retry, type, 0, NULL, mnttab_file_name, 0) < 0) { fatal("nfsmount: %m"); } exit(0); /* all went well */ } else { /* fork failed or parent running */ plog(XLOG_INFO, "parent waiting 1sec for mount..."); } } #ifdef HAVE_TRANSPORT_TYPE_TLI /* * XXX: this free_knetconfig() was not done for hlfsd before, * and apparently there was a reason for it, but why? -Erez */ free_knetconfig(nfs_args.knconf); /* * local automounter mounts do not allocate a special address, so * no need to XFREE(nfs_args.addr) under TLI. */ #endif /* HAVE_TRANSPORT_TYPE_TLI */ if (printpid) printf("%d\n", masterpid); plog(XLOG_INFO, "hlfsd ready to serve"); /* * If asked not to fork a daemon (-D nodaemon), then hlfsd_init() * will not run svc_run. We must start svc_run here. */ if (!amuDebug(D_DAEMON)) { plog(XLOG_DEBUG, "starting no-daemon debugging svc_run"); svc_run(); } cleanup(0); /* should never happen here */ return (0); /* everything went fine? */ } static void hlfsd_init(void) { int child = 0; #ifdef HAVE_SIGACTION struct sigaction sa; #endif /* HAVE_SIGACTION */ /* * Initialize file handles. */ plog(XLOG_INFO, "initializing hlfsd file handles"); hlfsd_init_filehandles(); /* * If -D daemon then we must fork. */ if (amuDebug(D_DAEMON)) child = fork(); if (child < 0) fatal("fork: %m"); if (child != 0) { /* parent process - save child pid */ masterpid = child; am_set_mypid(); /* for logging routines */ return; } /* * CHILD CODE: * initialize server */ plog(XLOG_INFO, "initializing home directory database"); plt_init(); /* initialize database */ plog(XLOG_INFO, "home directory database initialized"); masterpid = serverpid = am_set_mypid(); /* for logging routines */ /* * SIGALRM/SIGHUP: reload password database if timer expired * or user sent HUP signal. */ #ifdef HAVE_SIGACTION sa.sa_handler = reload; sa.sa_flags = 0; sigemptyset(&(sa.sa_mask)); sigaddset(&(sa.sa_mask), SIGALRM); sigaddset(&(sa.sa_mask), SIGHUP); sigaction(SIGALRM, &sa, NULL); sigaction(SIGHUP, &sa, NULL); #else /* not HAVE_SIGACTION */ signal(SIGALRM, reload); signal(SIGHUP, reload); #endif /* not HAVE_SIGACTION */ /* * SIGTERM: cleanup and exit. */ #ifdef HAVE_SIGACTION sa.sa_handler = cleanup; sa.sa_flags = 0; sigemptyset(&(sa.sa_mask)); sigaddset(&(sa.sa_mask), SIGTERM); sigaction(SIGTERM, &sa, NULL); #else /* not HAVE_SIGACTION */ signal(SIGTERM, cleanup); #endif /* not HAVE_SIGACTION */ /* * SIGCHLD: interlock synchronization and testing */ #ifdef HAVE_SIGACTION sa.sa_handler = interlock; sa.sa_flags = 0; sigemptyset(&(sa.sa_mask)); sigaddset(&(sa.sa_mask), SIGCHLD); sigaction(SIGCHLD, &sa, NULL); #else /* not HAVE_SIGACTION */ signal(SIGCHLD, interlock); #endif /* not HAVE_SIGACTION */ /* * SIGUSR1: dump internal hlfsd maps/cache to file */ #ifdef HAVE_SIGACTION # if defined(DEBUG) || defined(DEBUG_PRINT) sa.sa_handler = plt_print; # else /* not defined(DEBUG) || defined(DEBUG_PRINT) */ sa.sa_handler = SIG_IGN; # endif /* not defined(DEBUG) || defined(DEBUG_PRINT) */ sa.sa_flags = 0; sigemptyset(&(sa.sa_mask)); sigaddset(&(sa.sa_mask), SIGUSR1); sigaction(SIGUSR1, &sa, NULL); #else /* not HAVE_SIGACTION */ # if defined(DEBUG) || defined(DEBUG_PRINT) signal(SIGUSR1, plt_print); # else /* not defined(DEBUG) || defined(DEBUG_PRINT) */ signal(SIGUSR1, SIG_IGN); # endif /* not defined(DEBUG) || defined(DEBUG_PRINT) */ #endif /* not HAVE_SIGACTION */ if (setitimer(ITIMER_REAL, &reloadinterval, (struct itimerval *) NULL) < 0) fatal("setitimer: %m"); clocktime(&startup); /* * If -D daemon, then start serving here in the child, * and the parent will exit. But if -D nodaemon, then * skip this code and make sure svc_run is entered elsewhere. */ if (amuDebug(D_DAEMON)) { /* * Dissociate from the controlling terminal */ amu_release_controlling_tty(); /* * signal parent we are ready. parent should * mount(2) and die. */ if (kill(getppid(), SIGUSR2) < 0) fatal("kill: %m"); plog(XLOG_INFO, "starting svc_run"); svc_run(); cleanup(0); /* should never happen, just in case */ } } static RETSIGTYPE proceed(int signum) { stoplight = signum; } static RETSIGTYPE reload(int signum) { int child; int status; if (getpid() != masterpid) return; /* * If received a SIGHUP, close and reopen the log file (so that it * can be rotated) */ if (signum == SIGHUP && logfile) switch_to_logfile(logfile, orig_umask, 0); /* * parent performs the reload, while the child continues to serve * clients accessing the home dir link. */ if ((child = fork()) > 0) { serverpid = child; /* parent runs here */ am_set_mypid(); plt_init(); if (kill(child, SIGKILL) < 0) { plog(XLOG_ERROR, "kill child: %m"); } else { /* wait for child to die before continue */ if (wait(&status) != child) { /* * I took out this line because it generates annoying output. It * indicates a very small bug in hlfsd which is totally harmless. * It causes hlfsd to work a bit harder than it should. * Nevertheless, I intend on fixing it in a future release. * -Erez Zadok */ /* plog(XLOG_ERROR, "unknown child"); */ } } serverpid = masterpid; } else if (child < 0) { plog(XLOG_ERROR, "unable to fork: %m"); } else { /* let child handle requests while we reload */ serverpid = getpid(); am_set_mypid(); } } RETSIGTYPE cleanup(int signum) { struct stat stbuf; int umount_result; if (amuDebug(D_DAEMON)) { if (getpid() != masterpid) return; if (fork() != 0) { masterpid = 0; am_set_mypid(); return; } } am_set_mypid(); for (;;) { while ((umount_result = UMOUNT_FS(dir_name, mnttab_file_name, 0)) == EBUSY) { dlog("cleanup(): umount delaying for 10 seconds"); sleep(10); } if (stat(dir_name, &stbuf) == 0 && stbuf.st_ino == ROOTID) { plog(XLOG_ERROR, "unable to unmount %s", dir_name); plog(XLOG_ERROR, "suspending, unmount before terminating"); kill(am_mypid, SIGSTOP); continue; /* retry unmount */ } break; } if (amuDebug(D_DAEMON)) { plog(XLOG_INFO, "cleanup(): killing processes and terminating"); kill(masterpid, SIGKILL); kill(serverpid, SIGKILL); } plog(XLOG_INFO, "hlfsd terminating with status 0\n"); _exit(0); } static RETSIGTYPE reaper(int signum) { int result; if (wait(&result) == masterpid) { _exit(4); } } void hlfsd_going_down(int rc) { int mypid = getpid(); /* XXX: should this be the global am_mypid */ if (mypid == masterpid) cleanup(0); else if (mypid == serverpid) kill(masterpid, SIGTERM); exit(rc); } void fatal(char *mess) { if (logfile && !STREQ(logfile, "stderr")) { char lessmess[128]; int messlen; messlen = strlen(mess); if (!STREQ(&mess[messlen + 1 - sizeof(ERRM)], ERRM)) fprintf(stderr, "%s: %s\n", am_get_progname(), mess); else { xstrlcpy(lessmess, mess, sizeof(lessmess)); lessmess[messlen - 4] = '\0'; fprintf(stderr, "%s: %s: %s\n", am_get_progname(), lessmess, strerror(errno)); } } plog(XLOG_FATAL, "%s", mess); hlfsd_going_down(1); }