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133 lines
3.6 KiB
C
133 lines
3.6 KiB
C
/* Copyright (C) 2007-2014 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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*
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* Pattern matcher utility Functions
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*/
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#include "suricata-common.h"
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#include "util-prefilter.h"
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/**
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* \brief Setup a pmq
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*
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* \param pmq Pattern matcher queue to be initialized
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*
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* \retval -1 error
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* \retval 0 ok
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*/
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int PmqSetup(PrefilterRuleStore *pmq)
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{
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SCEnter();
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if (pmq == NULL) {
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SCReturnInt(-1);
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}
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memset(pmq, 0, sizeof(PrefilterRuleStore));
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pmq->rule_id_array_size = 128; /* Initial size, TODO: Make configure option. */
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pmq->rule_id_array_cnt = 0;
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size_t bytes = pmq->rule_id_array_size * sizeof(SigIntId);
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pmq->rule_id_array = (SigIntId*)SCMalloc(bytes);
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if (pmq->rule_id_array == NULL) {
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pmq->rule_id_array_size = 0;
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SCReturnInt(-1);
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}
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// Don't need to zero memory since it is always written first.
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SCReturnInt(0);
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}
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/** \brief Add array of Signature IDs to rule ID array.
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*
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* Checks size of the array first
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*
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* \param pmq storage for match results
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* \param new_size number of Signature IDs needing to be stored.
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*
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*/
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int
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PrefilterAddSidsResize(PrefilterRuleStore *pmq, uint32_t new_size)
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{
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/* Need to make the array bigger. Double the size needed to
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* also handle the case that sids_size might still be
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* larger than the old size.
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*/
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new_size = new_size * 2;
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SigIntId *new_array = (SigIntId*)SCRealloc(pmq->rule_id_array,
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new_size * sizeof(SigIntId));
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if (unlikely(new_array == NULL)) {
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/* Try again just big enough. */
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new_size = new_size / 2;
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new_array = (SigIntId*)SCRealloc(pmq->rule_id_array,
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new_size * sizeof(SigIntId));
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if (unlikely(new_array == NULL)) {
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SCLogError(SC_ERR_MEM_ALLOC, "Failed to realloc PatternMatchQueue"
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" rule ID array. Some signature ID matches lost");
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return 0;
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}
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}
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pmq->rule_id_array = new_array;
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pmq->rule_id_array_size = new_size;
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return new_size;
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}
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/** \brief Reset a Pmq for reusage. Meant to be called after a single search.
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* \param pmq Pattern matcher to be reset.
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* \todo memset is expensive, but we need it as we merge pmq's. We might use
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* a flag so we can clear pmq's the old way if we can.
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*/
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void PmqReset(PrefilterRuleStore *pmq)
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{
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if (pmq == NULL)
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return;
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PMQ_RESET(pmq);
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}
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/** \brief Cleanup a Pmq
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* \param pmq Pattern matcher queue to be cleaned up.
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*/
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void PmqCleanup(PrefilterRuleStore *pmq)
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{
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if (pmq == NULL)
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return;
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if (pmq->rule_id_array != NULL) {
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SCFree(pmq->rule_id_array);
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pmq->rule_id_array = NULL;
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}
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}
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/** \brief Cleanup and free a Pmq
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* \param pmq Pattern matcher queue to be free'd.
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*/
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void PmqFree(PrefilterRuleStore *pmq)
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{
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if (pmq == NULL)
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return;
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PmqCleanup(pmq);
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}
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