mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-30 15:38:06 +01:00
265 lines
7.5 KiB
C
265 lines
7.5 KiB
C
#if !defined(lint) && !defined(SABER)
|
|
static const char sccsid[] = "@(#)ns_main.c 4.55 (Berkeley) 7/1/91";
|
|
static const char rcsid[] = "$Id: ns_signal.c,v 8.12 2000/04/21 06:54:12 vixie Exp $";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* Copyright (c) 1986, 1989, 1990
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies, and that
|
|
* the name of Digital Equipment Corporation not be used in advertising or
|
|
* publicity pertaining to distribution of the document or software without
|
|
* specific, written prior permission.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
|
|
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
|
|
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
|
|
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
|
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
|
|
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
/*
|
|
* Portions Copyright (c) 1996-2000 by Internet Software Consortium.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
|
|
* ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
|
|
* CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
|
|
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
|
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
|
|
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
/* Import. */
|
|
|
|
#include "port_before.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/param.h>
|
|
#include <sys/file.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#ifdef SVR4 /* XXX */
|
|
# include <sys/sockio.h>
|
|
#else
|
|
# include <sys/mbuf.h>
|
|
#endif
|
|
|
|
#include <netinet/in.h>
|
|
#include <net/route.h>
|
|
#include <net/if.h>
|
|
#include <arpa/nameser.h>
|
|
#include <arpa/inet.h>
|
|
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <grp.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
#include <netdb.h>
|
|
#include <pwd.h>
|
|
#include <resolv.h>
|
|
#include <string.h>
|
|
#include <syslog.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#include <isc/eventlib.h>
|
|
#include <isc/logging.h>
|
|
#include <isc/memcluster.h>
|
|
#include <isc/list.h>
|
|
|
|
#include "port_after.h"
|
|
#include "named.h"
|
|
|
|
/* Forward. */
|
|
|
|
static SIG_FN onhup(int);
|
|
static SIG_FN onintr(int);
|
|
static SIG_FN setdumpflg(int);
|
|
static SIG_FN setIncrDbgFlg(int);
|
|
static SIG_FN setNoDbgFlg(int);
|
|
static SIG_FN setQrylogFlg(int);
|
|
static SIG_FN setstatsflg(int);
|
|
static SIG_FN discard_pipe(int);
|
|
static SIG_FN setreapflg(int);
|
|
|
|
/* Data. */
|
|
|
|
static struct {
|
|
int sig;
|
|
SIG_FN (*hand)(int);
|
|
} sighandlers[] = {
|
|
#ifdef DEBUG
|
|
{ SIGUSR1, setIncrDbgFlg },
|
|
{ SIGUSR2, setNoDbgFlg },
|
|
#endif
|
|
#if defined(SIGWINCH) && defined(QRYLOG)
|
|
{ SIGWINCH, setQrylogFlg },
|
|
#endif
|
|
#if defined(SIGXFSZ)
|
|
{ SIGXFSZ, onhup }, /* Wierd DEC Hesiodism, harmless. */
|
|
#endif
|
|
{ SIGINT, setdumpflg },
|
|
{ SIGILL, setstatsflg },
|
|
{ SIGHUP, onhup },
|
|
{ SIGCHLD, setreapflg },
|
|
{ SIGPIPE, discard_pipe },
|
|
{ SIGTERM, onintr }
|
|
};
|
|
|
|
static sigset_t mask;
|
|
static int blocked = 0;
|
|
|
|
/* Private. */
|
|
|
|
static SIG_FN
|
|
onhup(int sig) {
|
|
ns_need_unsafe(main_need_reload);
|
|
}
|
|
|
|
static SIG_FN
|
|
onintr(int sig) {
|
|
ns_need_unsafe(main_need_exit);
|
|
}
|
|
|
|
static SIG_FN
|
|
setdumpflg(int sig) {
|
|
ns_need_unsafe(main_need_dump);
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
static SIG_FN
|
|
setIncrDbgFlg(int sig) {
|
|
desired_debug++;
|
|
ns_need_unsafe(main_need_debug);
|
|
}
|
|
|
|
static SIG_FN
|
|
setNoDbgFlg(int sig) {
|
|
desired_debug = 0;
|
|
ns_need_unsafe(main_need_debug);
|
|
}
|
|
#endif /*DEBUG*/
|
|
|
|
#if defined(QRYLOG) && defined(SIGWINCH)
|
|
static SIG_FN
|
|
setQrylogFlg(int sig) {
|
|
ns_need_unsafe(main_need_qrylog);
|
|
}
|
|
#endif /*QRYLOG && SIGWINCH*/
|
|
|
|
static SIG_FN
|
|
setstatsflg(int sig) {
|
|
ns_need_unsafe(main_need_statsdump);
|
|
}
|
|
|
|
static SIG_FN
|
|
discard_pipe(int sig) {
|
|
#ifdef SIGPIPE_ONE_SHOT
|
|
int saved_errno = errno;
|
|
struct sigaction sa;
|
|
|
|
memset(&sa, 0, sizeof sa);
|
|
sa.sa_mask = mask;
|
|
sa.sa_handler = discard_pipe;
|
|
if (sigaction(SIGPIPE, &sa, NULL) < 0)
|
|
ns_error(ns_log_os, "sigaction failed in discard_pipe: %s",
|
|
strerror(errno));
|
|
errno = saved_errno;
|
|
#endif
|
|
}
|
|
|
|
static SIG_FN
|
|
setreapflg(int sig) {
|
|
ns_need_unsafe(main_need_reap);
|
|
}
|
|
|
|
/* Public. */
|
|
|
|
void
|
|
init_signals(void) {
|
|
int sh;
|
|
|
|
/* The mask of all our handlers will block all our other handlers. */
|
|
(void)sigemptyset(&mask);
|
|
for (sh = 0; sh < sizeof sighandlers / sizeof sighandlers[0]; sh++)
|
|
sigaddset(&mask, sighandlers[sh].sig);
|
|
|
|
/* Install our signal handlers with that shared mask. */
|
|
for (sh = 0; sh < sizeof sighandlers / sizeof sighandlers[0]; sh++) {
|
|
struct sigaction sa;
|
|
|
|
memset(&sa, 0, sizeof sa);
|
|
sa.sa_mask = mask;
|
|
sa.sa_handler = sighandlers[sh].hand;
|
|
if (sigaction(sighandlers[sh].sig, &sa, NULL) < 0)
|
|
ns_error(ns_log_os,
|
|
"sigaction failed in set_signal_handler(%d): %s",
|
|
sighandlers[sh].sig, strerror(errno));
|
|
}
|
|
}
|
|
|
|
void
|
|
block_signals(void) {
|
|
INSIST(!blocked);
|
|
if (sigprocmask(SIG_BLOCK, &mask, NULL) < 0)
|
|
ns_panic(ns_log_os, 1, "sigblock failed: %s", strerror(errno));
|
|
blocked = 1;
|
|
}
|
|
|
|
void
|
|
unblock_signals(void) {
|
|
INSIST(blocked);
|
|
if (sigprocmask(SIG_UNBLOCK, &mask, NULL) < 0)
|
|
ns_panic(ns_log_os, 1, "sigblock failed: %s", strerror(errno));
|
|
blocked = 0;
|
|
}
|