merge upstream 3.0.27a into svn

git-svn-id: svn://svn.debian.org/svn/pkg-samba/trunk/samba@1586 fc4039ab-9d04-0410-8cac-899223bdd6b0

1 files changed, 198 insertions, 0 deletions

diff --git a/source/lib/fault.c b/source/lib/fault.c
new file mode 100644
index 0000000000..d429c19748
--- /dev/null
+++ b/source/lib/fault.c
@@ -0,0 +1,198 @@
+/* 
+   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 2 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, write to the Free Software
+   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+#ifdef HAVE_SYS_PRCTL_H
+#include <sys/prctl.h>
+#endif
+
+static void (*cont_fn)(void *);
+static pstring 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)
+{
+	pstring logbase;
+	char * end;
+
+	if (lp_logfile() && *lp_logfile()) {
+		snprintf(logbase, sizeof(logbase), "%s", lp_logfile());
+		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.
+		 */
+		snprintf(logbase, sizeof(logbase), "%s", dyn_LOGFILEBASE);
+	}
+
+	SMB_ASSERT(progname != NULL);
+
+	snprintf(corepath, sizeof(corepath), "%s/cores", logbase);
+	mkdir(corepath,0700);
+
+	snprintf(corepath, sizeof(corepath), "%s/cores/%s",
+		logbase, progname);
+	mkdir(corepath,0700);
+
+	sys_chown(corepath,getuid(),getgid());
+	chmod(corepath,0700);
+
+#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)
+{
+	/* 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 */
+}
+