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/* Copyright (C) 2007-2010 Open Information Security Foundation
*
* You can copy, redistribute or modify this Program under the terms of
* the GNU General Public License version 2 as published by the Free
* Software Foundation.
*
* 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
* version 2 along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
/**
* \file
*
* \author Eileen Donlon <emdonlo@gmail.com>
*
* Coredump configuration
*/
#include "suricata-common.h"
#define _FILE_OFFSET_BITS 64
#include "util-coredump-config.h"
#include "conf.h"
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
#include "util-debug.h"
#ifdef OS_WIN32
void CoredumpEnable(void) {
}
int32_t CoredumpLoadConfig(void) {
/* todo: use the registry to get/set dump configuration */
SCLogInfo("Configuring core dump is not yet supported on Windows.");
return 0;
}
#else
static bool unlimited = false;
static rlim_t max_dump = 0;
/**
* \brief Enable coredumps on systems where coredumps can and need to
* be enabled.
*/
void CoredumpEnable(void)
{
if (!unlimited && !max_dump) {
return;
}
#if HAVE_SYS_PRCTL_H
/* Linux specific core dump configuration; set dumpable flag if needed */
int dumpable = 0;
dumpable = prctl(PR_GET_DUMPABLE, 0, 0, 0, 0);
if (dumpable == -1) {
SCLogNotice("Failed to get dumpable state of process, "
"core dumps may not be enabled: %s",
strerror(errno));
}
else if (unlimited || max_dump > 0) {
/* try to enable core dump for this process */
if (prctl(PR_SET_DUMPABLE, 1, 0, 0, 0) == -1) {
SCLogInfo("Unable to make this process dumpable.");
} else {
SCLogDebug("Process is dumpable.");
}
}
/* don't clear dumpable flag since this will have other effects;
* just set dump size to 0 below */
#endif /* HAVE_SYS_PRCTL_H */
}
/**
* \brief Configures the core dump size.
*
* \retval Returns 1 on success and 0 on failure.
*
*/
int32_t CoredumpLoadConfig (void)
{
#ifdef HAVE_SYS_RESOURCE_H
/* get core dump configuration settings for suricata */
const char *dump_size_config = NULL;
size_t rlim_size = sizeof(rlim_t);
if (ConfGet ("coredump.max-dump", &dump_size_config) == 0) {
SCLogDebug ("core dump size not specified");
return 1;
}
if (dump_size_config == NULL) {
SCLogError("malformed value for coredump.max-dump: NULL");
return 0;
}
if (strcasecmp (dump_size_config, "unlimited") == 0) {
unlimited = true;
}
else {
/* disallow negative values */
if (strchr (dump_size_config, '-') != NULL) {
SCLogInfo ("Negative value for core dump size; ignored.");
return 0;
}
/* the size of rlim_t is platform dependent */
if (rlim_size > 8) {
SCLogInfo ("Unexpected type for rlim_t");
return 0;
}
errno = 0;
if (rlim_size == 8) {
max_dump = (rlim_t) strtoull (dump_size_config, NULL, 10);
}
else if (rlim_size == 4) {
max_dump = (rlim_t) strtoul (dump_size_config, NULL, 10);
}
if ((errno == ERANGE) || (errno != 0 && max_dump == 0)) {
SCLogInfo ("Illegal core dump size: %s.", dump_size_config);
return 0;
}
SCLogInfo ("Max dump is %"PRIu64, (uint64_t) max_dump);
}
CoredumpEnable();
struct rlimit lim; /*existing limit*/
struct rlimit new_lim; /*desired limit*/
/* get the current core dump file configuration */
if (getrlimit (RLIMIT_CORE, &lim) == -1) {
SCLogInfo ("Can't read coredump limit for this process.");
return 0;
}
if (unlimited) {
/* we want no limit on coredump size */
if (lim.rlim_max == RLIM_INFINITY && lim.rlim_cur == RLIM_INFINITY) {
SCLogConfig ("Core dump size is unlimited.");
return 1;
}
else {
new_lim.rlim_max = RLIM_INFINITY;
new_lim.rlim_cur = RLIM_INFINITY;
if (setrlimit (RLIMIT_CORE, &new_lim) == 0) {
SCLogConfig ("Core dump size set to unlimited.");
return 1;
}
if (errno == EPERM) {
/* couldn't raise the hard limit to unlimited;
* try increasing the soft limit to the hard limit instead */
if (lim.rlim_cur < lim.rlim_max) {
new_lim.rlim_cur = lim.rlim_max;
if (setrlimit (RLIMIT_CORE, & new_lim) == 0) {
SCLogInfo ("Could not set core dump size to unlimited; core dump size set to the hard limit.");
return 0;
}
else {
SCLogInfo ("Failed to set core dump size to unlimited or to the hard limit.");
return 0;
}
}
SCLogInfo ("Could not set core dump size to unlimited; it's set to the hard limit.");
return 0;
}
}
}
else {
/* we want a non-infinite soft limit on coredump size */
new_lim.rlim_cur = max_dump;
/* check whether the hard limit needs to be adjusted */
if (lim.rlim_max == RLIM_INFINITY) {
/* keep the current value (unlimited) for the hard limit */
new_lim.rlim_max = lim.rlim_max;
}
#ifdef RLIM_SAVED_MAX
else if (lim.rlim_max == RLIM_SAVED_MAX) {
/* keep the current value (unknown) for the hard limit */
new_lim.rlim_max = lim.rlim_max;
}
#endif
else if (lim.rlim_max < max_dump) {
/* need to raise the hard coredump size limit */
new_lim.rlim_max = max_dump;
}
else {
/* hard limit is ample */
new_lim.rlim_max = lim.rlim_max;
}
if (setrlimit (RLIMIT_CORE, &new_lim) == 0) {
SCLogInfo ("Core dump setting attempted is %"PRIu64, (uint64_t) new_lim.rlim_cur);
struct rlimit actual_lim;
if (getrlimit (RLIMIT_CORE, &actual_lim) == 0) {
if (actual_lim.rlim_cur == RLIM_INFINITY) {
SCLogConfig ("Core dump size set to unlimited.");
}
#ifdef RLIM_SAVED_CUR
else if (actual_lim.rlim_cur == RLIM_SAVED_CUR) {
SCLogInfo ("Core dump size set to soft limit.");
}
#endif
else {
SCLogInfo ("Core dump size set to %"PRIu64, (uint64_t) actual_lim.rlim_cur);
}
}
return 1;
}
if (errno == EINVAL || errno == EPERM) {
/* couldn't increase the hard limit, or the soft limit exceeded the hard
* limit; try to raise the soft limit to the hard limit */
if ((lim.rlim_cur < max_dump && lim.rlim_cur < lim.rlim_max)
#ifdef RLIM_SAVED_CUR
|| (lim.rlim_cur == RLIM_SAVED_CUR)
#endif
){
new_lim.rlim_max = lim.rlim_max;
new_lim.rlim_cur = lim.rlim_max;
if (setrlimit (RLIMIT_CORE, &new_lim) == 0) {
SCLogInfo("Core dump size set to the hard limit.");
return 0;
}
}
}
}
/* failed to set the coredump limit */
SCLogInfo("Couldn't set coredump size to %s.", dump_size_config);
#endif /* HAVE_SYS_RESOURCE_H */
return 0;
}
#endif /* OS_WIN32 */
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