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/*
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Unix SMB / CIFS implementation .
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Critical Fault handling
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Copyright ( C ) Andrew Tridgell 1992 - 1998
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Copyright ( C ) Tim Prouty 2009
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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
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the Free Software Foundation ; either version 3 of the License , or
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( at your option ) any later version .
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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 .
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You should have received a copy of the GNU General Public License
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along with this program . If not , see < http : //www.gnu.org/licenses/>.
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*/
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# include "replace.h"
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# include "system/filesys.h"
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# include "system/wait.h"
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# include "version.h"
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# ifdef HAVE_SYS_SYSCTL_H
# include <sys/sysctl.h>
# endif
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# ifdef HAVE_SYS_PRCTL_H
# include <sys/prctl.h>
# endif
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# include "debug.h"
# include "lib/util/signal.h" /* Avoid /usr/include/signal.h */
# include "substitute.h"
# include "fault.h"
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static struct {
bool disabled ;
smb_panic_handler_t panic_handler ;
} fault_state ;
/*******************************************************************
setup variables used for fault handling
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
void fault_configure ( smb_panic_handler_t panic_handler )
{
fault_state . panic_handler = panic_handler ;
}
/**
disable setting up fault handlers
This is used for the bind9 dlz module , as we
don ' t want a Samba module in bind9 to override the bind
fault handling
* */
_PUBLIC_ void fault_setup_disable ( void )
{
fault_state . disabled = true ;
}
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/*******************************************************************
report a fault
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static void fault_report ( int sig )
{
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static int counter ;
if ( counter ) _exit ( 1 ) ;
counter + + ;
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DEBUGSEP ( 0 ) ;
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DEBUG ( 0 , ( " INTERNAL ERROR: Signal %d in pid %d (%s) " , sig , ( int ) getpid ( ) , SAMBA_VERSION_STRING ) ) ;
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DEBUG ( 0 , ( " \n Please read the Trouble-Shooting section of the Samba HOWTO \n " ) ) ;
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DEBUGSEP ( 0 ) ;
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smb_panic ( " internal error " ) ;
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/* smb_panic() never returns, so this is really redundant */
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exit ( 1 ) ;
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}
/****************************************************************************
catch serious errors
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
static void sig_fault ( int sig )
{
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fault_report ( sig ) ;
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}
/*******************************************************************
setup our fault handlers
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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void fault_setup ( void )
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{
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if ( fault_state . disabled ) {
return ;
}
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# if !defined(HAVE_DISABLE_FAULT_HANDLING)
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# ifdef SIGSEGV
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CatchSignal ( SIGSEGV , sig_fault ) ;
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# endif
# ifdef SIGBUS
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CatchSignal ( SIGBUS , sig_fault ) ;
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# endif
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# ifdef SIGABRT
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CatchSignal ( SIGABRT , sig_fault ) ;
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# endif
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# endif
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}
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_PUBLIC_ const char * panic_action = NULL ;
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/*
default smb_panic ( ) implementation
*/
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static void smb_panic_default ( const char * why ) _NORETURN_ ;
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static void smb_panic_default ( const char * why )
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{
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# if defined(HAVE_PRCTL) && defined(PR_SET_PTRACER)
/*
* Make sure all children can attach a debugger .
*/
prctl ( PR_SET_PTRACER , getpid ( ) , 0 , 0 , 0 ) ;
# endif
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if ( panic_action & & * panic_action ) {
char cmdstring [ 200 ] ;
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if ( strlcpy ( cmdstring , panic_action , sizeof ( cmdstring ) ) < sizeof ( cmdstring ) ) {
int result ;
char pidstr [ 20 ] ;
snprintf ( pidstr , sizeof ( pidstr ) , " %d " , ( int ) getpid ( ) ) ;
all_string_sub ( cmdstring , " %d " , pidstr , sizeof ( cmdstring ) ) ;
DEBUG ( 0 , ( " smb_panic(): calling panic action [%s] \n " , cmdstring ) ) ;
result = system ( cmdstring ) ;
if ( result = = - 1 )
DEBUG ( 0 , ( " smb_panic(): fork failed in panic action: %s \n " ,
strerror ( errno ) ) ) ;
else
DEBUG ( 0 , ( " smb_panic(): action returned status %d \n " ,
WEXITSTATUS ( result ) ) ) ;
}
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}
DEBUG ( 0 , ( " PANIC: %s \n " , why ) ) ;
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# ifdef SIGABRT
CatchSignal ( SIGABRT , SIG_DFL ) ;
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# endif
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abort ( ) ;
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}
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/**
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Something really nasty happened - panic !
* */
_PUBLIC_ void smb_panic ( const char * why )
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{
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if ( fault_state . panic_handler ) {
fault_state . panic_handler ( why ) ;
_exit ( 1 ) ;
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}
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smb_panic_default ( why ) ;
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}