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freebsd-dev/contrib/amd/hlfsd/hlfsd.c
David E. O'Brien b5959ffd1f We are returning to the stock (6.0.7) file now. 
+ The bufov vulnerability was fixed in the vendor sources.
+ The vendor sources are now POSIX [me harder] compliant.
2001-09-02 18:46:35 +00:00

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/*
* Copyright (c) 1997-2001 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* 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.
*
* %W% (Berkeley) %G%
*
* $Id: hlfsd.c,v 1.7.2.2 2001/01/10 03:23:35 ezk Exp $
* $FreeBSD$
*
* HLFSD was written at Columbia University Computer Science Department, by
* Erez Zadok <ezk@cs.columbia.edu> and Alexander Dupuy <dupuy@cs.columbia.edu>
* It is being distributed under the same terms and conditions as amd does.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <hlfsd.h>
/*
* 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 = 0;
char hostname[MAXHOSTNAMELEN + 1] = "localhost";
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);
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);
}
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 */
int s = -99;
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++;
}
/* set some default debugging options */
if (xlog_level_init == ~0)
switch_option("");
/* 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_FIELD_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_FIELD_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 */
gethostname(hostname, sizeof(hostname));
hostname[sizeof(hostname) - 1] = '\0';
if ((dot = strchr(hostname, '.')) != NULL)
*dot = '\0';
orig_umask = umask(0);
if (logfile)
switch_to_logfile(logfile, orig_umask);
#if defined(DEBUG) && !defined(MOUNT_TABLE_ON_FILE)
if (debug_flags & D_MTAB)
dlog("-D mtab option ignored");
#endif /* defined(DEBUG) && !defined(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);
}
clock_valid = 0; /* invalidate logging clock */
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.
*/
#ifdef HAVE_TRANSPORT_TYPE_TLI
ret = create_nfs_service(&soNFS, &nfs_port, &nfsxprt, nfs_program_2);
#else /* not HAVE_TRANSPORT_TYPE_TLI */
ret = create_nfs_service(&soNFS, &nfs_port, &nfsxprt, nfs_program_2);
#endif /* not HAVE_TRANSPORT_TYPE_TLI */
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 */
#ifdef DEBUG
/*
* In the parent, if -D nodaemon (or -D daemon) , we don't need to
* set this signal handler.
*/
amuDebug(D_DAEMON) {
#endif /* DEBUG */
/* XXX: port to use pure svr4 signals */
s = -99;
while (stoplight != SIGUSR2) {
plog(XLOG_INFO, "parent waits for child to setup (stoplight=%d)", stoplight);
s = sigpause(0); /* wait for child to set up */
sleep(1);
}
#ifdef DEBUG
}
#endif /* DEBUG */
/*
* setup options to mount table (/etc/{mtab,mnttab}) entry
*/
sprintf(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 {
strcpy(preopts, default_mntopts);
/*
* 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
strcat(preopts, ",");
strcat(preopts, MNTTAB_OPT_INTR);
#endif /* MNTTAB_OPT_INTR */
#ifdef MNTTAB_OPT_IGNORE
strcat(preopts, ",");
strcat(preopts, MNTTAB_OPT_IGNORE);
#endif /* MNTTAB_OPT_IGNORE */
#ifdef MNT2_GEN_OPT_CACHE
strcat(preopts, ",nocache");
#endif /* MNT2_GEN_OPT_CACHE */
#ifdef MNT2_NFS_OPT_SYMTTL
strcat(preopts, ",symttl=0");
#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".
*/
mnt.mnt_type = 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);
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
*/
sprintf(progpid_fs, "%s:%d", am_get_progname(), masterpid);
/* Most kernels have a name length restriction. */
if ((int) strlen(progpid_fs) >= (int) MAXHOSTNAMELEN)
strcpy(progpid_fs + MAXHOSTNAMELEN - 3, "..");
genflags = compute_mount_flags(&mnt);
retry = hasmntval(&mnt, MNTTAB_OPT_RETRY);
if (retry <= 0)
retry = 1; /* XXX */
memmove(&anh.v2.fhs_fh, 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,
&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);
clock_valid = 0; /* invalidate logging clock */
/*
* The following code could be cleverly ifdef-ed, but I duplicated the
* mount_fs call three times for simplicity and readability.
*/
#ifdef DEBUG
/*
* For some reason, this mount may have to be done in the background, if I am
* using -D nodebug. 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 nodaemon, 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 (debug_flags & D_DAEMON) { /* asked for -D daemon */
plog(XLOG_INFO, "parent NFS mounting hlfsd service points");
if (mount_fs(&mnt, genflags, (caddr_t) &nfs_args, retry, type, 0, NULL, mnttab_file_name) < 0)
fatal("nfsmount: %m");
} else { /* asked for -D nodaemon */
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) {
fatal("nfsmount: %m");
}
exit(0); /* all went well */
} else { /* fork failed or parent running */
plog(XLOG_INFO, "parent waiting 1sec for mount...");
}
}
#else /* not DEBUG */
plog(XLOG_INFO, "normal NFS mounting hlfsd service points");
if (mount_fs(&mnt, genflags, (caddr_t) &nfs_args, retry, type, 2, "udp", mnttab_file_name) < 0)
fatal("nfsmount: %m");
#endif /* not DEBUG */
#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");
#ifdef DEBUG
/*
* If asked not to fork a daemon (-D nodaemon), then hlfsd_init()
* will not run svc_run. We must start svc_run here.
*/
dlog("starting no-daemon debugging svc_run");
amuDebugNo(D_DAEMON)
svc_run();
#endif /* DEBUG */
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 */
clock_valid = 0; /* invalidate logging clock */
/*
* Initialize file handles.
*/
plog(XLOG_INFO, "initializing hlfsd file handles");
hlfsd_init_filehandles();
#ifdef DEBUG
/*
* If -D daemon then we must fork.
*/
amuDebug(D_DAEMON)
#endif /* DEBUG */
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 *) 0) < 0)
fatal("setitimer: %m");
gettimeofday((struct timeval *) &startup, (struct timezone *) 0);
#ifdef DEBUG
/*
* 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.
*/
amuDebug(D_DAEMON) {
#endif /* DEBUG */
/*
* 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 */
#ifdef DEBUG
} /* end of code that runs iff hlfsd daemonizes */
#endif /* DEBUG */
}
static RETSIGTYPE
proceed(int signum)
{
stoplight = signum;
}
static RETSIGTYPE
reload(int signum)
{
int child;
int status;
clock_valid = 0; /* invalidate logging clock */
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);
/*
* 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 <ezk@cs.columbia.edu>
*/
/* 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;
clock_valid = 0; /* invalidate logging clock */
#ifdef DEBUG
amuDebug(D_DAEMON)
#endif /* DEBUG */
if (getpid() != masterpid)
return;
#ifdef DEBUG
amuDebug(D_DAEMON)
#endif /* DEBUG */
if (fork() != 0) {
masterpid = 0;
am_set_mypid();
return;
}
am_set_mypid();
for (;;) {
while ((umount_result = UMOUNT_FS(dir_name, mnttab_file_name)) == EBUSY) {
#ifdef DEBUG
dlog("cleanup(): umount delaying for 10 seconds");
#endif /* DEBUG */
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;
}
#ifdef DEBUG
dlog("cleanup(): killing processes and terminating");
amuDebug(D_DAEMON)
#endif /* DEBUG */
kill(masterpid, SIGKILL);
#ifdef DEBUG
amuDebug(D_DAEMON)
#endif /* DEBUG */
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 {
strcpy(lessmess, mess);
lessmess[messlen - 4] = '\0';
if (errno < sys_nerr)
fprintf(stderr, "%s: %s: %s\n", am_get_progname(), lessmess,
#ifdef HAVE_STRERROR
strerror(errno)
#else /* not HAVE_STRERROR */
sys_errlist[errno]
#endif /* not HAVE_STRERROR */
);
else
fprintf(stderr, "%s: %s: Error %d\n",
am_get_progname(), lessmess, errno);
}
}
plog(XLOG_FATAL, "%s", mess);
hlfsd_going_down(1);
}
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