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/*
Unix SMB/CIFS implementation.
Critical Fault handling
Copyright (C) Andrew Tridgell 1992-1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
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
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
static void (*cont_fn)(void *);
static char *corepath;
/*******************************************************************
report a fault
********************************************************************/
static void fault_report(int sig)
{
static int counter;
if (counter) _exit(1);
counter++;
DEBUGSEP(0);
DEBUG(0,("INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)sys_getpid(),SAMBA_VERSION_STRING));
DEBUG(0,("\nPlease read the Trouble-Shooting section of the Samba3-HOWTO\n"));
DEBUG(0,("\nFrom: http://www.samba.org/samba/docs/Samba3-HOWTO.pdf\n"));
DEBUGSEP(0);
smb_panic("internal error");
if (cont_fn) {
cont_fn(NULL);
#ifdef SIGSEGV
CatchSignal(SIGSEGV,SIGNAL_CAST SIG_DFL);
#endif
#ifdef SIGBUS
CatchSignal(SIGBUS,SIGNAL_CAST SIG_DFL);
#endif
#ifdef SIGABRT
CatchSignal(SIGABRT,SIGNAL_CAST SIG_DFL);
#endif
return; /* this should cause a core dump */
}
exit(1);
}
/****************************************************************************
catch serious errors
****************************************************************************/
static void sig_fault(int sig)
{
fault_report(sig);
}
/*******************************************************************
setup our fault handlers
********************************************************************/
void fault_setup(void (*fn)(void *))
{
cont_fn = fn;
#ifdef SIGSEGV
CatchSignal(SIGSEGV,SIGNAL_CAST sig_fault);
#endif
#ifdef SIGBUS
CatchSignal(SIGBUS,SIGNAL_CAST sig_fault);
#endif
#ifdef SIGABRT
CatchSignal(SIGABRT,SIGNAL_CAST sig_fault);
#endif
}
/*******************************************************************
make all the preparations to safely dump a core file
********************************************************************/
void dump_core_setup(const char *progname)
{
char *logbase = NULL;
char *end = NULL;
if (lp_logfile() && *lp_logfile()) {
if (asprintf(&logbase, "%s", lp_logfile()) < 0) {
return;
}
if ((end = strrchr_m(logbase, '/'))) {
*end = '\0';
}
} else {
/* We will end up here is the log file is given on the command
* line by the -l option but the "log file" option is not set
* in smb.conf.
*/
if (asprintf(&logbase, "%s", get_dyn_LOGFILEBASE()) < 0) {
return;
}
}
SMB_ASSERT(progname != NULL);
if (asprintf(&corepath, "%s/cores", logbase) < 0) {
SAFE_FREE(logbase);
return;
}
mkdir(corepath,0700);
SAFE_FREE(corepath);
if (asprintf(&corepath, "%s/cores/%s",
logbase, progname) < 0) {
SAFE_FREE(logbase);
return;
}
mkdir(corepath,0700);
sys_chown(corepath,getuid(),getgid());
chmod(corepath,0700);
SAFE_FREE(corepath);
SAFE_FREE(logbase);
#ifdef HAVE_GETRLIMIT
#ifdef RLIMIT_CORE
{
struct rlimit rlp;
getrlimit(RLIMIT_CORE, &rlp);
rlp.rlim_cur = MAX(16*1024*1024,rlp.rlim_cur);
setrlimit(RLIMIT_CORE, &rlp);
getrlimit(RLIMIT_CORE, &rlp);
DEBUG(3,("Maximum core file size limits now %d(soft) %d(hard)\n",
(int)rlp.rlim_cur,(int)rlp.rlim_max));
}
#endif
#endif
#if defined(HAVE_PRCTL) && defined(PR_SET_DUMPABLE)
/* On Linux we lose the ability to dump core when we change our user
* ID. We know how to dump core safely, so let's make sure we have our
* dumpable flag set.
*/
prctl(PR_SET_DUMPABLE, 1);
#endif
/* FIXME: if we have a core-plus-pid facility, configurably set
* this up here.
*/
}
void dump_core(void)
{
static bool called;
if (called) {
DEBUG(0, ("dump_core() called recursive\n"));
exit(1);
}
called = true;
/* Note that even if core dumping has been disabled, we still set up
* the core path. This is to handle the case where core dumping is
* turned on in smb.conf and the relevant daemon is not restarted.
*/
if (!lp_enable_core_files()) {
DEBUG(0, ("Exiting on internal error (core file administratively disabled)\n"));
exit(1);
}
#if DUMP_CORE
/* If we're running as non root we might not be able to dump the core
* file to the corepath. There must not be an unbecome_root() before
* we call abort(). */
if (geteuid() != 0) {
become_root();
}
if (*corepath != '\0') {
/* The chdir might fail if we dump core before we finish
* processing the config file.
*/
if (chdir(corepath) != 0) {
DEBUG(0, ("unable to change to %s\n", corepath));
DEBUGADD(0, ("refusing to dump core\n"));
exit(1);
}
DEBUG(0,("dumping core in %s\n", corepath));
}
umask(~(0700));
dbgflush();
/* Ensure we don't have a signal handler for abort. */
#ifdef SIGABRT
CatchSignal(SIGABRT,SIGNAL_CAST SIG_DFL);
#endif
abort();
#else /* DUMP_CORE */
exit(1);
#endif /* DUMP_CORE */
}
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