4.4BSD/usr/src/usr.sbin/amd/amd/amd.c
/*
* Copyright (c) 1989 Jan-Simon Pendry
* Copyright (c) 1989 Imperial College of Science, Technology & Medicine
* Copyright (c) 1989, 1993
* 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 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.
*
* @(#)amd.c 8.1 (Berkeley) 6/6/93
*
* $Id: amd.c,v 5.2.2.1 1992/02/09 15:08:15 jsp beta $
*
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
/*
* Automounter
*/
#include "am.h"
#include <sys/signal.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <setjmp.h>
char pid_fsname[16 + MAXHOSTNAMELEN]; /* "kiska.southseas.nz:(pid%d)" */
char *progname; /* "amd" */
#ifdef HAS_HOST
#ifdef HOST_EXEC
char *host_helper;
#endif /* HOST_EXEC */
#endif /* HAS_HOST */
char *auto_dir = "/a";
char *hostdomain = "unknown.domain";
char hostname[MAXHOSTNAMELEN] = "localhost"; /* Hostname */
char hostd[2*MAXHOSTNAMELEN]; /* Host+domain */
char *op_sys = OS_REP; /* Name of current op_sys */
char *arch = ARCH_REP; /* Name of current architecture */
char *endian = ARCH_ENDIAN; /* Big or Little endian */
char *wire;
int foreground = 1; /* This is the top-level server */
int mypid; /* Current process id */
int immediate_abort; /* Should close-down unmounts be retried */
struct in_addr myipaddr; /* (An) IP address of this host */
serv_state amd_state;
struct amd_stats amd_stats; /* Server statistics */
time_t do_mapc_reload = 0; /* mapc_reload() call required? */
jmp_buf select_intr;
int select_intr_valid;
int orig_umask;
/*
* Signal handler:
* SIGINT - tells amd to do a full shutdown, including unmounting all filesystem.
* SIGTERM - tells amd to shutdown now. Just unmounts the automount nodes.
*/
static void sigterm(sig)
int sig;
{
#ifdef SYS5_SIGNALS
signal(sig, sigterm);
#endif /* SYS5_SIGNALS */
switch (sig) {
case SIGINT:
immediate_abort = 15;
break;
case SIGTERM:
immediate_abort = -1;
/* fall through... */
default:
plog(XLOG_WARNING, "WARNING: automounter going down on signal %d", sig);
break;
}
if (select_intr_valid)
longjmp(select_intr, sig);
}
/*
* Hook for cache reload.
* When a SIGHUP arrives it schedules a call to mapc_reload
*/
/*ARGSUSED*/
static void sighup(sig)
int sig;
{
#ifdef SYS5_SIGNALS
signal(sig, sighup);
#endif /* SYS5_SIGNALS */
#ifdef DEBUG
if (sig != SIGHUP)
dlog("spurious call to sighup");
#endif /* DEBUG */
/*
* Force a reload by zero'ing the timer
*/
if (amd_state == Run)
do_mapc_reload = 0;
}
/*ARGSUSED*/
static void parent_exit(sig)
int sig;
{
exit(0);
}
static int daemon_mode(P_void)
{
int bgpid;
signal(SIGQUIT, parent_exit);
bgpid = background();
if (bgpid != 0) {
if (print_pid) {
printf("%d\n", bgpid);
fflush(stdout);
}
/*
* Now wait for the automount points to
* complete.
*/
for (;;)
pause();
}
signal(SIGQUIT, SIG_DFL);
/*
* Pretend we are in the foreground again
*/
foreground = 1;
#ifdef TIOCNOTTY
{
int t = open("/dev/tty", O_RDWR);
if (t < 0) {
if (errno != ENXIO) /* not an error if already no controlling tty */
plog(XLOG_WARNING, "Could not open controlling tty: %m");
} else {
if (ioctl(t, TIOCNOTTY, 0) < 0 && errno != ENOTTY)
plog(XLOG_WARNING, "Could not disassociate tty (TIOCNOTTY): %m");
(void) close(t);
}
}
#else
(void) setpgrp();
#endif /* TIOCNOTTY */
return getppid();
}
main(argc, argv)
int argc;
char *argv[];
{
char *domdot;
int ppid = 0;
int error;
/*
* Make sure some built-in assumptions are true before we start
*/
assert(sizeof(nfscookie) >= sizeof (unsigned int));
assert(sizeof(int) >= 4);
/*
* Set processing status.
*/
amd_state = Start;
/*
* Determine program name
*/
if (argv[0]) {
progname = strrchr(argv[0], '/');
if (progname && progname[1])
progname++;
else
progname = argv[0];
}
if (!progname)
progname = "amd";
/*
* Initialise process id. This is kept
* cached since it is used for generating
* and using file handles.
*/
mypid = getpid();
/*
* Get local machine name
*/
if (gethostname(hostname, sizeof(hostname)) < 0) {
plog(XLOG_FATAL, "gethostname: %m");
going_down(1);
}
/*
* Check it makes sense
*/
if (!*hostname) {
plog(XLOG_FATAL, "host name is not set");
going_down(1);
}
/*
* Partially initialise hostd[]. This
* is completed in get_args().
*/
if (domdot = strchr(hostname, '.')) {
/*
* Hostname already contains domainname.
* Split out hostname and domainname
* components
*/
*domdot++ = '\0';
hostdomain = domdot;
}
strcpy(hostd, hostname);
/*
* Trap interrupts for shutdowns.
*/
(void) signal(SIGINT, sigterm);
/*
* Hangups tell us to reload the cache
*/
(void) signal(SIGHUP, sighup);
/*
* Trap Terminate so that we can shutdown gracefully (some chance)
*/
(void) signal(SIGTERM, sigterm);
/*
* Trap Death-of-a-child. These allow us to
* pick up the exit status of backgrounded mounts.
* See "sched.c".
*/
(void) signal(SIGCHLD, sigchld);
/*
* Fix-up any umask problems. Most systems default
* to 002 which is not too convenient for our purposes
*/
orig_umask = umask(0);
/*
* Figure out primary network name
*/
wire = getwire();
/*
* Determine command-line arguments
*/
get_args(argc, argv);
/*
* Get our own IP address so that we
* can mount the automounter.
*/
{ struct sockaddr_in sin;
get_myaddress(&sin);
myipaddr.s_addr = sin.sin_addr.s_addr;
}
/*
* Now check we are root.
*/
if (geteuid() != 0) {
plog(XLOG_FATAL, "Must be root to mount filesystems (euid = %d)", geteuid());
going_down(1);
}
#ifdef HAS_NIS_MAPS
/*
* If the domain was specified then bind it here
* to circumvent any default bindings that may
* be done in the C library.
*/
if (domain && yp_bind(domain)) {
plog(XLOG_FATAL, "Can't bind to domain \"%s\"", domain);
going_down(1);
}
#endif /* HAS_NIS_MAPS */
#ifdef DEBUG
Debug(D_DAEMON)
#endif /* DEBUG */
ppid = daemon_mode();
sprintf(pid_fsname, "%s:(pid%d)", hostname, mypid);
do_mapc_reload = clocktime() + ONE_HOUR;
/*
* Register automounter with system
*/
error = mount_automounter(ppid);
if (error && ppid)
kill(SIGALRM, ppid);
going_down(error);
abort();
}