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/* Copyright (C) 2007-2012 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 Victor Julien <victor@inliniac.net>
*/
#include "suricata-common.h"
#include "host.h"
#include "detect-engine-tag.h"
#include "detect-engine-threshold.h"
#include "host-bit.h"
#include "reputation.h"
uint32_t HostGetSpareCount(void)
{
return HostSpareQueueGetSize();
}
uint32_t HostGetActiveCount(void)
{
return SC_ATOMIC_GET(host_counter);
}
/** \internal
* \brief See if we can really discard this host. Check use_cnt reference.
*
* \param h host
* \param ts timestamp
*
* \retval 0 not timed out just yet
* \retval 1 fully timed out, lets kill it
*/
static int HostHostTimedOut(Host *h, struct timeval *ts)
{
int tags = 0;
int thresholds = 0;
int vars = 0;
/** never prune a host that is used by a packet
* we are currently processing in one of the threads */
if (SC_ATOMIC_GET(h->use_cnt) > 0) {
return 0;
}
if (h->iprep) {
if (SRepHostTimedOut(h) == 0)
return 0;
SCLogDebug("host %p reputation timed out", h);
}
if (TagHostHasTag(h) && TagTimeoutCheck(h, ts) == 0) {
tags = 1;
}
if (ThresholdHostHasThreshold(h) && ThresholdTimeoutCheck(h, ts) == 0) {
thresholds = 1;
}
if (HostHasHostBits(h) && HostBitsTimedoutCheck(h, ts) == 0) {
vars = 1;
}
if (tags || thresholds || vars)
return 0;
SCLogDebug("host %p timed out", h);
return 1;
}
/**
* \internal
*
* \brief check all hosts in a hash row for timing out
*
* \param hb host hash row *LOCKED*
* \param h last host in the hash row
* \param ts timestamp
*
* \retval cnt timed out hosts
*/
static uint32_t HostHashRowTimeout(HostHashRow *hb, Host *h, struct timeval *ts)
{
uint32_t cnt = 0;
do {
if (SCMutexTrylock(&h->m) != 0) {
h = h->hprev;
continue;
}
Host *next_host = h->hprev;
/* check if the host is fully timed out and
* ready to be discarded. */
if (HostHostTimedOut(h, ts) == 1) {
/* remove from the hash */
if (h->hprev != NULL)
h->hprev->hnext = h->hnext;
if (h->hnext != NULL)
h->hnext->hprev = h->hprev;
if (hb->head == h)
hb->head = h->hnext;
if (hb->tail == h)
hb->tail = h->hprev;
h->hnext = NULL;
h->hprev = NULL;
HostClearMemory (h);
/* no one is referring to this host, use_cnt 0, removed from hash
* so we can unlock it and move it back to the spare queue. */
SCMutexUnlock(&h->m);
/* move to spare list */
HostMoveToSpare(h);
cnt++;
} else {
SCMutexUnlock(&h->m);
}
h = next_host;
} while (h != NULL);
return cnt;
}
/**
* \brief time out hosts from the hash
*
* \param ts timestamp
*
* \retval cnt number of timed out host
*/
uint32_t HostTimeoutHash(struct timeval *ts)
{
uint32_t idx = 0;
uint32_t cnt = 0;
for (idx = 0; idx < host_config.hash_size; idx++) {
HostHashRow *hb = &host_hash[idx];
if (HRLOCK_TRYLOCK(hb) != 0)
continue;
/* host hash bucket is now locked */
if (hb->tail == NULL) {
HRLOCK_UNLOCK(hb);
continue;
}
/* we have a host, or more than one */
cnt += HostHashRowTimeout(hb, hb->tail, ts);
HRLOCK_UNLOCK(hb);
}
return cnt;
}
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