2003-01-09 14:29:36 +01:00
|
|
|
/* signal.c - signal handling
|
2005-05-13 14:37:52 +02:00
|
|
|
* Copyright (C) 1998, 1999, 2000, 2001, 2002,
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|
|
|
* 2005 Free Software Foundation, Inc.
|
2003-01-09 14:29:36 +01:00
|
|
|
*
|
|
|
|
* This file is part of GnuPG.
|
|
|
|
*
|
Change license for some files in common to LGPLv3+/GPLv2+.
Having the LGPL on the common GnuPG code helps to share code
between GnuPG and related projects (like GPGME and Libassuan). This
is good for interoperability and to reduces bugs.
* common/asshelp.c, common/asshelp.h, common/asshelp2.c, common/b64dec.c
* common/b64enc.c, common/convert.c, common/dns-cert.c
* common/dns-cert.h common/exechelp-posix.c, common/exechelp-w32.c
* common/exechelp-w32ce.c, common/exechelp.h, common/get-passphrase.c
* common/get-passphrase.h, common/gettime.c, common/gpgrlhelp.c
* common/helpfile.c, common/homedir.c, common/http.c, common/http.h
* common/i18n.c, common/init.c, common/init.h, common/iobuf.c
* common/iobuf.h, common/localename.c, common/membuf.c, common/membuf.h
* common/miscellaneous.c, common/openpgp-oid.c, common/openpgpdefs.h
* common/percent.c, common/pka.c, common/pka.h, common/session-env.c
* common/session-env.h, common/sexp-parse.h, common/sexputil.c
* common/signal.c, common/srv.c, common/srv.h, common/ssh-utils.c
* common/ssh-utils.h, common/sysutils.c, common/sysutils.h
* common/tlv.c, common/tlv.h, common/ttyio.c, common/ttyio.h
* common/userids.c, common/userids.h, common/xasprintf.c: Change
license to LGPLv3+/GPLv2+/
2012-04-20 15:43:06 +02:00
|
|
|
* This file is free software; you can redistribute it and/or modify
|
|
|
|
* it under the terms of either
|
2003-01-09 14:29:36 +01:00
|
|
|
*
|
Change license for some files in common to LGPLv3+/GPLv2+.
Having the LGPL on the common GnuPG code helps to share code
between GnuPG and related projects (like GPGME and Libassuan). This
is good for interoperability and to reduces bugs.
* common/asshelp.c, common/asshelp.h, common/asshelp2.c, common/b64dec.c
* common/b64enc.c, common/convert.c, common/dns-cert.c
* common/dns-cert.h common/exechelp-posix.c, common/exechelp-w32.c
* common/exechelp-w32ce.c, common/exechelp.h, common/get-passphrase.c
* common/get-passphrase.h, common/gettime.c, common/gpgrlhelp.c
* common/helpfile.c, common/homedir.c, common/http.c, common/http.h
* common/i18n.c, common/init.c, common/init.h, common/iobuf.c
* common/iobuf.h, common/localename.c, common/membuf.c, common/membuf.h
* common/miscellaneous.c, common/openpgp-oid.c, common/openpgpdefs.h
* common/percent.c, common/pka.c, common/pka.h, common/session-env.c
* common/session-env.h, common/sexp-parse.h, common/sexputil.c
* common/signal.c, common/srv.c, common/srv.h, common/ssh-utils.c
* common/ssh-utils.h, common/sysutils.c, common/sysutils.h
* common/tlv.c, common/tlv.h, common/ttyio.c, common/ttyio.h
* common/userids.c, common/userids.h, common/xasprintf.c: Change
license to LGPLv3+/GPLv2+/
2012-04-20 15:43:06 +02:00
|
|
|
* - the GNU Lesser General Public License as published by the Free
|
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|
* Software Foundation; either version 3 of the License, or (at
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|
|
* your option) any later version.
|
|
|
|
*
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|
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|
* or
|
|
|
|
*
|
|
|
|
* - the GNU General Public License as published by the Free
|
|
|
|
* Software Foundation; either version 2 of the License, or (at
|
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|
|
* your option) any later version.
|
|
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|
*
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|
|
* or both in parallel, as here.
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|
*
|
|
|
|
* This file is distributed in the hope that it will be useful,
|
2003-01-09 14:29:36 +01:00
|
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
* GNU General Public License for more details.
|
|
|
|
*
|
|
|
|
* You should have received a copy of the GNU General Public License
|
2016-11-05 12:02:19 +01:00
|
|
|
* along with this program; if not, see <https://www.gnu.org/licenses/>.
|
2003-01-09 14:29:36 +01:00
|
|
|
*/
|
|
|
|
|
|
|
|
#include <config.h>
|
|
|
|
#include <stdio.h>
|
|
|
|
#include <stdlib.h>
|
2010-03-02 22:25:08 +01:00
|
|
|
#ifdef HAVE_SIGNAL_H
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|
|
# include <signal.h>
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|
|
#endif
|
2003-01-09 14:29:36 +01:00
|
|
|
#include <unistd.h>
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|
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|
#include <string.h>
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|
#include <errno.h>
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|
|
|
#include <assert.h>
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|
|
|
|
|
|
#include "util.h"
|
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|
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|
|
|
2004-12-21 11:03:00 +01:00
|
|
|
#ifndef HAVE_DOSISH_SYSTEM
|
2003-01-09 14:29:36 +01:00
|
|
|
static volatile int caught_fatal_sig;
|
|
|
|
static volatile int caught_sigusr1;
|
2004-12-21 11:03:00 +01:00
|
|
|
#endif
|
2003-01-09 14:29:36 +01:00
|
|
|
static void (*cleanup_fnc)(void);
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|
2004-12-21 11:03:00 +01:00
|
|
|
#ifndef HAVE_DOSISH_SYSTEM
|
2003-01-09 14:29:36 +01:00
|
|
|
static void
|
2020-11-18 05:51:38 +01:00
|
|
|
init_one_signal (int sig, void (*handler)(int), int check_ign )
|
2003-01-09 14:29:36 +01:00
|
|
|
{
|
|
|
|
# ifdef HAVE_SIGACTION
|
|
|
|
struct sigaction oact, nact;
|
2011-02-04 12:57:53 +01:00
|
|
|
|
2003-01-09 14:29:36 +01:00
|
|
|
if (check_ign)
|
|
|
|
{
|
|
|
|
/* we don't want to change an IGN handler */
|
|
|
|
sigaction (sig, NULL, &oact );
|
|
|
|
if (oact.sa_handler == SIG_IGN )
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
nact.sa_handler = handler;
|
|
|
|
sigemptyset (&nact.sa_mask);
|
|
|
|
nact.sa_flags = 0;
|
|
|
|
sigaction ( sig, &nact, NULL);
|
2011-02-04 12:57:53 +01:00
|
|
|
# else
|
2020-11-18 05:51:38 +01:00
|
|
|
void (*ohandler)(int);
|
2011-02-04 12:57:53 +01:00
|
|
|
|
2003-01-09 14:29:36 +01:00
|
|
|
ohandler = signal (sig, handler);
|
2011-02-04 12:57:53 +01:00
|
|
|
if (check_ign && ohandler == SIG_IGN)
|
2003-01-09 14:29:36 +01:00
|
|
|
{
|
|
|
|
/* Change it back if it was already set to IGN */
|
|
|
|
signal (sig, SIG_IGN);
|
|
|
|
}
|
|
|
|
# endif
|
|
|
|
}
|
2004-12-21 11:03:00 +01:00
|
|
|
#endif /*!HAVE_DOSISH_SYSTEM*/
|
2003-01-09 14:29:36 +01:00
|
|
|
|
2004-12-21 11:03:00 +01:00
|
|
|
#ifndef HAVE_DOSISH_SYSTEM
|
2003-01-09 14:29:36 +01:00
|
|
|
static const char *
|
|
|
|
get_signal_name( int signum )
|
|
|
|
{
|
2005-05-13 14:37:52 +02:00
|
|
|
/* Note that we can't use strsignal(), because it is not
|
|
|
|
reentrant. */
|
2005-10-08 01:46:36 +02:00
|
|
|
#if HAVE_DECL_SYS_SIGLIST && defined(NSIG)
|
2003-01-09 14:29:36 +01:00
|
|
|
return (signum >= 0 && signum < NSIG) ? sys_siglist[signum] : "?";
|
|
|
|
#else
|
2005-05-13 14:37:52 +02:00
|
|
|
return NULL;
|
2003-01-09 14:29:36 +01:00
|
|
|
#endif
|
|
|
|
}
|
2004-12-21 11:03:00 +01:00
|
|
|
#endif /*!HAVE_DOSISH_SYSTEM*/
|
2003-01-09 14:29:36 +01:00
|
|
|
|
2004-12-21 11:03:00 +01:00
|
|
|
#ifndef HAVE_DOSISH_SYSTEM
|
2020-11-18 05:51:38 +01:00
|
|
|
static void
|
2003-01-09 14:29:36 +01:00
|
|
|
got_fatal_signal (int sig)
|
|
|
|
{
|
|
|
|
const char *s;
|
|
|
|
|
|
|
|
if (caught_fatal_sig)
|
2007-05-07 21:49:12 +02:00
|
|
|
raise (sig);
|
2003-01-09 14:29:36 +01:00
|
|
|
caught_fatal_sig = 1;
|
2011-02-04 12:57:53 +01:00
|
|
|
|
2003-01-09 14:29:36 +01:00
|
|
|
if (cleanup_fnc)
|
|
|
|
cleanup_fnc ();
|
2005-05-13 14:37:52 +02:00
|
|
|
/* Better don't translate these messages. */
|
2011-08-10 14:11:30 +02:00
|
|
|
(void)write (2, "\n", 1 );
|
2003-01-09 14:29:36 +01:00
|
|
|
s = log_get_prefix (NULL);
|
|
|
|
if (s)
|
2011-08-10 14:11:30 +02:00
|
|
|
(void)write(2, s, strlen (s));
|
|
|
|
(void)write (2, ": signal ", 9 );
|
2003-01-09 14:29:36 +01:00
|
|
|
s = get_signal_name(sig);
|
2005-05-13 14:37:52 +02:00
|
|
|
if (s)
|
2011-08-10 14:11:30 +02:00
|
|
|
(void) write (2, s, strlen(s) );
|
2005-05-13 14:37:52 +02:00
|
|
|
else
|
|
|
|
{
|
|
|
|
/* We are in a signal handler so we can't use any kind of printf
|
2007-05-07 21:49:12 +02:00
|
|
|
even not sprintf. So we use a straightforward algorithm. We
|
|
|
|
got a report that on one particular system, raising a signal
|
|
|
|
while in this handler, the parameter SIG get sclobbered and
|
|
|
|
things are messed up because we modify its value. Although
|
|
|
|
this is a bug in that system, we will protect against it. */
|
2005-05-13 14:37:52 +02:00
|
|
|
if (sig < 0 || sig >= 100000)
|
2011-08-10 14:11:30 +02:00
|
|
|
(void)write (2, "?", 1);
|
2011-02-04 12:57:53 +01:00
|
|
|
else
|
2005-05-13 14:37:52 +02:00
|
|
|
{
|
2007-05-07 21:49:12 +02:00
|
|
|
int i, value, any=0;
|
2005-05-13 14:37:52 +02:00
|
|
|
|
2007-05-07 21:49:12 +02:00
|
|
|
for (value=sig,i=10000; i; i /= 10)
|
2005-05-13 14:37:52 +02:00
|
|
|
{
|
2007-05-07 21:49:12 +02:00
|
|
|
if (value >= i || ((any || i==1) && !(value/i)))
|
2005-05-13 14:37:52 +02:00
|
|
|
{
|
2016-10-06 14:48:52 +02:00
|
|
|
(void)write (2, &"0123456789"[value/i], 1);
|
2007-05-07 21:49:12 +02:00
|
|
|
if ((value/i))
|
2005-05-13 14:37:52 +02:00
|
|
|
any = 1;
|
2007-05-07 21:49:12 +02:00
|
|
|
value %= i;
|
2005-05-13 14:37:52 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
2011-08-10 14:11:30 +02:00
|
|
|
(void)write (2, " caught ... exiting\n", 20);
|
2011-02-04 12:57:53 +01:00
|
|
|
|
2005-05-13 14:37:52 +02:00
|
|
|
/* Reset action to default action and raise signal again */
|
2003-01-09 14:29:36 +01:00
|
|
|
init_one_signal (sig, SIG_DFL, 0);
|
2005-05-13 14:37:52 +02:00
|
|
|
/* Fixme: remove_lockfiles ();*/
|
2003-01-09 14:29:36 +01:00
|
|
|
#ifdef __riscos__
|
|
|
|
close_fds ();
|
|
|
|
#endif /* __riscos__ */
|
|
|
|
raise( sig );
|
|
|
|
}
|
2004-12-21 11:03:00 +01:00
|
|
|
#endif /*!HAVE_DOSISH_SYSTEM*/
|
2003-01-09 14:29:36 +01:00
|
|
|
|
2004-12-21 11:03:00 +01:00
|
|
|
#ifndef HAVE_DOSISH_SYSTEM
|
2020-11-18 05:51:38 +01:00
|
|
|
static void
|
2003-01-09 14:29:36 +01:00
|
|
|
got_usr_signal (int sig)
|
|
|
|
{
|
2008-10-20 15:53:23 +02:00
|
|
|
(void)sig;
|
2003-01-09 14:29:36 +01:00
|
|
|
caught_sigusr1 = 1;
|
|
|
|
}
|
2004-12-21 11:03:00 +01:00
|
|
|
#endif /*!HAVE_DOSISH_SYSTEM*/
|
2003-01-09 14:29:36 +01:00
|
|
|
|
|
|
|
void
|
|
|
|
gnupg_init_signals (int mode, void (*fast_cleanup)(void))
|
|
|
|
{
|
|
|
|
assert (!mode);
|
|
|
|
|
|
|
|
cleanup_fnc = fast_cleanup;
|
|
|
|
#ifndef HAVE_DOSISH_SYSTEM
|
|
|
|
init_one_signal (SIGINT, got_fatal_signal, 1 );
|
|
|
|
init_one_signal (SIGHUP, got_fatal_signal, 1 );
|
|
|
|
init_one_signal (SIGTERM, got_fatal_signal, 1 );
|
|
|
|
init_one_signal (SIGQUIT, got_fatal_signal, 1 );
|
|
|
|
init_one_signal (SIGSEGV, got_fatal_signal, 1 );
|
|
|
|
init_one_signal (SIGUSR1, got_usr_signal, 0 );
|
|
|
|
init_one_signal (SIGPIPE, SIG_IGN, 0 );
|
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
static void
|
2010-03-22 13:46:05 +01:00
|
|
|
do_block (int block)
|
2003-01-09 14:29:36 +01:00
|
|
|
{
|
2010-03-22 13:46:05 +01:00
|
|
|
#ifdef HAVE_DOSISH_SYSTEM
|
|
|
|
(void)block;
|
|
|
|
#else /*!HAVE_DOSISH_SYSTEM*/
|
2003-01-09 14:29:36 +01:00
|
|
|
static int is_blocked;
|
|
|
|
#ifdef HAVE_SIGPROCMASK
|
|
|
|
static sigset_t oldmask;
|
|
|
|
|
|
|
|
if (block)
|
|
|
|
{
|
|
|
|
sigset_t newmask;
|
|
|
|
|
|
|
|
if (is_blocked)
|
|
|
|
log_bug ("signals are already blocked\n");
|
|
|
|
sigfillset( &newmask );
|
|
|
|
sigprocmask( SIG_BLOCK, &newmask, &oldmask );
|
|
|
|
is_blocked = 1;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
if (!is_blocked)
|
|
|
|
log_bug("signals are not blocked\n");
|
|
|
|
sigprocmask (SIG_SETMASK, &oldmask, NULL);
|
|
|
|
is_blocked = 0;
|
|
|
|
}
|
|
|
|
#else /*!HAVE_SIGPROCMASK*/
|
|
|
|
static void (*disposition[MAXSIG])();
|
|
|
|
int sig;
|
|
|
|
|
|
|
|
if (block)
|
|
|
|
{
|
|
|
|
if (is_blocked)
|
|
|
|
log_bug("signals are already blocked\n");
|
|
|
|
for (sig=1; sig < MAXSIG; sig++)
|
|
|
|
{
|
|
|
|
disposition[sig] = sigset (sig, SIG_HOLD);
|
|
|
|
}
|
|
|
|
is_blocked = 1;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
{
|
|
|
|
if (!is_blocked)
|
|
|
|
log_bug ("signals are not blocked\n");
|
|
|
|
for (sig=1; sig < MAXSIG; sig++) {
|
|
|
|
sigset (sig, disposition[sig]);
|
|
|
|
}
|
|
|
|
is_blocked = 0;
|
|
|
|
}
|
|
|
|
#endif /*!HAVE_SIGPROCMASK*/
|
2010-03-22 13:46:05 +01:00
|
|
|
#endif /*!HAVE_DOSISH_SYSTEM*/
|
2003-01-09 14:29:36 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
void
|
|
|
|
gnupg_block_all_signals ()
|
|
|
|
{
|
|
|
|
do_block(1);
|
|
|
|
}
|
|
|
|
|
|
|
|
void
|
|
|
|
gnupg_unblock_all_signals ()
|
|
|
|
{
|
|
|
|
do_block(0);
|
|
|
|
}
|