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/* Copyright (C) 2013 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.
*/
/**
* \ingroup httplayer
*
* @{
*/
/**
* \file
*
* \author Eric Leblond <eric@regit.org>
*
* This file provides a memory handling for the HTTP protocol support.
*/
#include "suricata-common.h"
#include "app-layer-htp-mem.h"
#include "conf.h"
#include "util-misc.h"
#include "util-debug.h"
SC_ATOMIC_DECLARE(uint64_t, htp_config_memcap);
SC_ATOMIC_DECLARE(uint64_t, htp_memuse);
SC_ATOMIC_DECLARE(uint64_t, htp_memcap);
void HTPParseMemcap(void)
{
const char *conf_val;
SC_ATOMIC_INIT(htp_config_memcap);
/** set config values for memcap, prealloc and hash_size */
uint64_t memcap;
if ((ConfGet("app-layer.protocols.http.memcap", &conf_val)) == 1)
{
if (ParseSizeStringU64(conf_val, &memcap) < 0) {
SCLogError("Error parsing http.memcap "
"from conf file - %s. Killing engine",
conf_val);
exit(EXIT_FAILURE);
} else {
SC_ATOMIC_SET(htp_config_memcap, memcap);
}
SCLogInfo("HTTP memcap: %"PRIu64, SC_ATOMIC_GET(htp_config_memcap));
} else {
/* default to unlimited */
SC_ATOMIC_SET(htp_config_memcap, 0);
}
SC_ATOMIC_INIT(htp_memuse);
SC_ATOMIC_INIT(htp_memcap);
}
static void HTPIncrMemuse(uint64_t size)
{
(void) SC_ATOMIC_ADD(htp_memuse, size);
return;
}
static void HTPDecrMemuse(uint64_t size)
{
(void) SC_ATOMIC_SUB(htp_memuse, size);
return;
}
uint64_t HTPMemuseGlobalCounter(void)
{
uint64_t tmpval = SC_ATOMIC_GET(htp_memuse);
return tmpval;
}
uint64_t HTPMemcapGlobalCounter(void)
{
uint64_t tmpval = SC_ATOMIC_GET(htp_memcap);
return tmpval;
}
/**
* \brief Check if alloc'ing "size" would mean we're over memcap
*
* \retval 1 if in bounds
* \retval 0 if not in bounds
*/
static int HTPCheckMemcap(uint64_t size)
{
uint64_t memcapcopy = SC_ATOMIC_GET(htp_config_memcap);
if (memcapcopy == 0 || size + SC_ATOMIC_GET(htp_memuse) <= memcapcopy)
return 1;
(void) SC_ATOMIC_ADD(htp_memcap, 1);
return 0;
}
/**
* \brief Update memcap value
*
* \param size new memcap value
*/
int HTPSetMemcap(uint64_t size)
{
if (size == 0 || (uint64_t)SC_ATOMIC_GET(htp_memuse) < size) {
SC_ATOMIC_SET(htp_config_memcap, size);
return 1;
}
return 0;
}
/**
* \brief Update memcap value
*
* \retval memcap value
*/
uint64_t HTPGetMemcap(void)
{
uint64_t memcapcopy = SC_ATOMIC_GET(htp_config_memcap);
return memcapcopy;
}
void *HTPMalloc(size_t size)
{
void *ptr = NULL;
if (HTPCheckMemcap((uint32_t)size) == 0)
return NULL;
ptr = SCMalloc(size);
if (unlikely(ptr == NULL))
return NULL;
HTPIncrMemuse((uint64_t)size);
return ptr;
}
void *HTPCalloc(size_t n, size_t size)
{
void *ptr = NULL;
if (HTPCheckMemcap((uint32_t)(n * size)) == 0)
return NULL;
ptr = SCCalloc(n, size);
if (unlikely(ptr == NULL))
return NULL;
HTPIncrMemuse((uint64_t)(n * size));
return ptr;
}
void *HTPRealloc(void *ptr, size_t orig_size, size_t size)
{
if (size > orig_size) {
if (HTPCheckMemcap((uint32_t)(size - orig_size)) == 0)
return NULL;
}
void *rptr = SCRealloc(ptr, size);
if (rptr == NULL)
return NULL;
if (size > orig_size) {
HTPIncrMemuse((uint64_t)(size - orig_size));
} else {
HTPDecrMemuse((uint64_t)(orig_size - size));
}
return rptr;
}
void HTPFree(void *ptr, size_t size)
{
SCFree(ptr);
HTPDecrMemuse((uint64_t)size);
}
/**
* @}
*/
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