Unix SMB/CIFS implementation.
Critical Fault handling
Copyright (C) Andrew Tridgell 1992-1998
+ Copyright (C) Tim Prouty 2009
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
+ 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,
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.
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
+#ifdef HAVE_SYS_SYSCTL_H
+#include <sys/sysctl.h>
+#endif
+
+
+#ifdef HAVE_SYS_PRCTL_H
+#include <sys/prctl.h>
+#endif
+
static void (*cont_fn)(void *);
+static char *corepath;
/*******************************************************************
report a fault
counter++;
- DEBUG(0,("===============================================================\n"));
- DEBUG(0,("INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)sys_getpid(),SAMBA_VERSION_STRING));
- DEBUG(0,("\nPlease read the appendix Bugs of the Samba HOWTO collection\n"));
- DEBUG(0,("===============================================================\n"));
+ 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");
#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 */
}
#ifdef SIGBUS
CatchSignal(SIGBUS,SIGNAL_CAST sig_fault);
#endif
+#ifdef SIGABRT
+ CatchSignal(SIGABRT,SIGNAL_CAST sig_fault);
+#endif
+}
+
+/**
+ * Build up the default corepath as "<logbase>/cores/<progname>"
+ */
+static char *get_default_corepath(const char *logbase, const char *progname)
+{
+ char *tmp_corepath;
+
+ /* Setup core dir in logbase. */
+ tmp_corepath = talloc_asprintf(NULL, "%s/cores", logbase);
+ if (!tmp_corepath)
+ return NULL;
+
+ if ((mkdir(tmp_corepath, 0700) == -1) && errno != EEXIST)
+ goto err_out;
+
+ if (chmod(tmp_corepath, 0700) == -1)
+ goto err_out;
+
+ talloc_free(tmp_corepath);
+
+ /* Setup progname-specific core subdir */
+ tmp_corepath = talloc_asprintf(NULL, "%s/cores/%s", logbase, progname);
+ if (!tmp_corepath)
+ return NULL;
+
+ if (mkdir(tmp_corepath, 0700) == -1 && errno != EEXIST)
+ goto err_out;
+
+ if (chown(tmp_corepath, getuid(), getgid()) == -1)
+ goto err_out;
+
+ if (chmod(tmp_corepath, 0700) == -1)
+ goto err_out;
+
+ return tmp_corepath;
+
+ err_out:
+ talloc_free(tmp_corepath);
+ return NULL;
}
+/**
+ * Get the FreeBSD corepath.
+ *
+ * On FreeBSD the current working directory is ignored when creating a core
+ * file. Instead the core directory is controlled via sysctl. This consults
+ * the value of "kern.corefile" so the correct corepath can be printed out
+ * before dump_core() calls abort.
+ */
+#if (defined(FREEBSD) && defined(HAVE_SYSCTLBYNAME))
+static char *get_freebsd_corepath(void)
+{
+ char *tmp_corepath = NULL;
+ char *end = NULL;
+ size_t len = 128;
+ int ret;
+
+ /* Loop with increasing sizes so we don't allocate too much. */
+ do {
+ if (len > 1024) {
+ goto err_out;
+ }
+
+ tmp_corepath = (char *)talloc_realloc(NULL, tmp_corepath,
+ char, len);
+ if (!tmp_corepath) {
+ return NULL;
+ }
+
+ ret = sysctlbyname("kern.corefile", tmp_corepath, &len, NULL,
+ 0);
+ if (ret == -1) {
+ if (errno != ENOMEM) {
+ DEBUG(0, ("sysctlbyname failed getting "
+ "kern.corefile %s\n",
+ strerror(errno)));
+ goto err_out;
+ }
+
+ /* Not a large enough array, try a bigger one. */
+ len = len << 1;
+ }
+ } while (ret == -1);
+
+ /* Strip off the common filename expansion */
+ if ((end = strrchr_m(tmp_corepath, '/'))) {
+ *end = '\0';
+ }
+
+ return tmp_corepath;
+
+ err_out:
+ if (tmp_corepath) {
+ talloc_free(tmp_corepath);
+ }
+ return NULL;
+}
+#endif
+
+/**
+ * Try getting system-specific corepath if one exists.
+ *
+ * If the system doesn't define a corepath, then the default is used.
+ */
+static char *get_corepath(const char *logbase, const char *progname)
+{
+#if (defined(FREEBSD) && defined(HAVE_SYSCTLBYNAME))
+
+ /* @todo: Add support for the linux corepath. */
+ char *tmp_corepath = NULL;
+ tmp_corepath = get_freebsd_corepath();
+
+ /* If this has been set correctly, we're done. */
+ if (tmp_corepath) {
+ return tmp_corepath;
+ }
+#endif
+
+ /* Fall back to the default. */
+ return get_default_corepath(logbase, progname);
+}
+
+/*******************************************************************
+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 if 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);
+
+ corepath = get_corepath(logbase, progname);
+ if (!corepath) {
+ DEBUG(0, ("Unable to setup corepath for %s: %s\n", progname,
+ strerror(errno)));
+ goto out;
+ }
+
+
+#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.
+ */
+ out:
+ SAFE_FREE(logbase);
+}
+
+ 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() != sec_initial_uid()) {
+ become_root();
+ }
+
+ if (corepath == NULL) {
+ DEBUG(0, ("Can not dump core: corepath not set up\n"));
+ exit(1);
+ }
+
+ 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 */
+}
git.samba.org / samba.git / blobdiff