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diff lowmem.cc

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//--------------------------------------------------------------------------

// This program is free software; you can redistribute it and/or modify it

// under the terms of the GNU General Public License Version 2 as published

// by the Free Software Foundation. You may not use, modify or distribute

// this program under any other version of the GNU General Public License.

// 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 along

// with this program; if not, write to the Free Software Foundation, Inc.,

// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

//--------------------------------------------------------------------------

* An abstracted interface to the Multi-Pattern Matching routines,

* thats why we're passing 'void *' objects around.

* Marc A Norton <mnorton@sourcefire.com>

* Updates:

* 3/06 - Added AC_BNFA search

// lowmem.cc author Russ Combs <rucombs@cisco.com>

#include "log/messages.h"

#include "framework/mpse.h"

#include "sfksearch.h"

#include <deque>

using namespace snort;

//-------------------------------------------------------------------------

// "lowmem"

//-------------------------------------------------------------------------

class LowmemMpse : public Mpse

{

private:

KTRIE_STRUCT* obj;

std::deque<int> dbg_match_dq, dbg_match_want_dq;

public:

LowmemMpse(const MpseAgent* agent) : Mpse("lowmem")

{ obj = KTrieNew(0, agent); }

{

obj = KTrieNew(0, agent);

dbg_match_want_dq = std::deque<int>({35, 3, 32, 7, 10, 58, 1});

obj->can_debug = false;

}

~LowmemMpse() override

{ KTrieDelete(obj); }

{

KTrieDelete(obj);

}

int add_pattern(

const uint8_t* P, unsigned m, const PatternDescriptor& desc, void* user) override

{

return KTrieAddPattern(obj, P, m, desc.no_case, desc.negated, user);

int ans = KTrieAddPattern(obj, P, m, desc.no_case, desc.negated, user);

return ans;

}

int prep_patterns(SnortConfig* sc) override

{

return KTrieCompile(sc, obj);

int ans = KTrieCompile(sc, obj);

return ans;

}

int _search(

const uint8_t* T, int n, MpseMatch match,

void* context, int* current_state) override

{

*current_state = 0;

return KTrieSearch(obj, T, n, match, context);

if (dbg_match_dq == dbg_match_want_dq) {

obj->can_debug = true;

}

int ans = KTrieSearch(obj, T, n, match, context);

dbg_match_dq.push_back(ans);

if (dbg_match_dq.size() > dbg_match_want_dq.size()) dbg_match_dq.pop_front();

if (obj->can_debug) {

obj->can_debug = false;

printf("search finished: matches = %d\n", ans);

printf("number of patterns: %d\n", KTriePatternCount(obj));

printf("T = ");

for (int i = 0; i < n; i++) printf("%d ", T[i]);

printf("\n");

}

return ans;

}

int get_pattern_count() const override

{ return KTriePatternCount(obj); }

{

int ans = KTriePatternCount(obj);

return ans;

}

};

//-------------------------------------------------------------------------

// api

//-------------------------------------------------------------------------

static Mpse* lm_ctor(const SnortConfig*, class Module*, const MpseAgent* agent)

{

return new LowmemMpse(agent);

}

static void lm_dtor(Mpse* p)

{

delete p;

}

static void lm_init()

{

KTrie_init_xlatcase();

KTrieInitMemUsed();

}

static void lm_print()

{

if ( !KTrieMemUsed() )

return;

double x = (double)KTrieMemUsed();

LogMessage("[ LowMem Search-Method Memory Used : %g %s ]\n",

(x > 1.e+6) ? x/1.e+6 : x/1.e+3,

(x > 1.e+6) ? "MBytes" : "KBytes");

}

static const MpseApi lm_api =

{

PT_SEARCH_ENGINE,

sizeof(MpseApi),

SEAPI_VERSION,

API_RESERVED,

API_OPTIONS,

"lowmem",

"Keyword Trie (low memory, moderate performance) MPSE",

nullptr,

nullptr

MPSE_BASE,

nullptr,

lm_ctor,

lm_dtor,

lm_init,

lm_print,

nullptr

};

const BaseApi* se_lowmem = &lm_api.base;

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//--------------------------------------------------------------------------
// Copyright (C) 2014-2024 Cisco and/or its affiliates. All rights reserved.
// Copyright (C) 2002-2013 Sourcefire, Inc.
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License Version 2 as published
// by the Free Software Foundation.  You may not use, modify or distribute
// this program under any other version of the GNU General Public License.
//
// 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 along
// with this program; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//--------------------------------------------------------------------------

/*
*   An abstracted interface to the Multi-Pattern Matching routines,
*   thats why we're passing 'void *' objects around.
*
*   Marc A Norton <mnorton@sourcefire.com>
*
*   Updates:
*   3/06 - Added AC_BNFA search
*/
// lowmem.cc author Russ Combs <rucombs@cisco.com>

#include "log/messages.h"
#include "framework/mpse.h"

#include "sfksearch.h"

using namespace snort;

//-------------------------------------------------------------------------
// "lowmem"
//-------------------------------------------------------------------------

class LowmemMpse : public Mpse
{
private:
    KTRIE_STRUCT* obj;

public:
    LowmemMpse(const MpseAgent* agent) : Mpse("lowmem")
    { obj = KTrieNew(0, agent); }

~LowmemMpse() override
    { KTrieDelete(obj); }

int add_pattern(
        const uint8_t* P, unsigned m, const PatternDescriptor& desc, void* user) override
    {
        return KTrieAddPattern(obj, P, m, desc.no_case, desc.negated, user);
    }

int prep_patterns(SnortConfig* sc) override
    {
        return KTrieCompile(sc, obj);
    }

int _search(
        const uint8_t* T, int n, MpseMatch match,
        void* context, int* current_state) override
    {
        *current_state = 0;
        return KTrieSearch(obj, T, n, match, context);
    }

int get_pattern_count() const override
    { return KTriePatternCount(obj); }
};

//-------------------------------------------------------------------------
// api
//-------------------------------------------------------------------------

static Mpse* lm_ctor(const SnortConfig*, class Module*, const MpseAgent* agent)
{
    return new LowmemMpse(agent);
}

static void lm_dtor(Mpse* p)
{
    delete p;
}

static void lm_init()
{
    KTrie_init_xlatcase();
    KTrieInitMemUsed();
}

static void lm_print()
{
    if ( !KTrieMemUsed() )
        return;

double x = (double)KTrieMemUsed();

LogMessage("[ LowMem Search-Method Memory Used : %g %s ]\n",
        (x > 1.e+6) ?  x/1.e+6 : x/1.e+3,
        (x > 1.e+6) ? "MBytes" : "KBytes");
}

static const MpseApi lm_api =
{
    {
        PT_SEARCH_ENGINE,
        sizeof(MpseApi),
        SEAPI_VERSION,
        0,
        API_RESERVED,
        API_OPTIONS,
        "lowmem",
        "Keyword Trie (low memory, moderate performance) MPSE",
        nullptr,
        nullptr
    },
    MPSE_BASE,
    nullptr,
    nullptr,
    nullptr,
    nullptr,
    lm_ctor,
    lm_dtor,
    lm_init,
    lm_print,
    nullptr
};

const BaseApi* se_lowmem = &lm_api.base;

Texto modificado

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#include "log/messages.h"
#include "framework/mpse.h"

#include "sfksearch.h"

#include <deque>

using namespace snort;

//-------------------------------------------------------------------------
// "lowmem"
//-------------------------------------------------------------------------

class LowmemMpse : public Mpse
{
private:
    KTRIE_STRUCT* obj;

std::deque<int> dbg_match_dq, dbg_match_want_dq;

public:
    LowmemMpse(const MpseAgent* agent) : Mpse("lowmem")
    {
        obj = KTrieNew(0, agent);

dbg_match_want_dq = std::deque<int>({35, 3, 32, 7, 10, 58, 1});
        obj->can_debug = false;
    }

~LowmemMpse() override
    {
        KTrieDelete(obj);
    }

int add_pattern(
        const uint8_t* P, unsigned m, const PatternDescriptor& desc, void* user) override
    {
        int ans = KTrieAddPattern(obj, P, m, desc.no_case, desc.negated, user);

return ans;
    }

int prep_patterns(SnortConfig* sc) override
    {
        int ans = KTrieCompile(sc, obj);

return ans;
    }

int _search(
            const uint8_t* T, int n, MpseMatch match,
        void* context, int* current_state) override
    {
        *current_state = 0;

if (dbg_match_dq == dbg_match_want_dq) {
            obj->can_debug = true;
        }

int ans = KTrieSearch(obj, T, n, match, context);

dbg_match_dq.push_back(ans);
        if (dbg_match_dq.size() > dbg_match_want_dq.size()) dbg_match_dq.pop_front();

if (obj->can_debug) {
            obj->can_debug = false;

printf("search finished: matches = %d\n", ans);
            printf("number of patterns: %d\n", KTriePatternCount(obj));
            printf("T = ");
            for (int i = 0; i < n; i++) printf("%d ", T[i]);
            printf("\n");
        }

return ans;
    }

int get_pattern_count() const override
    {
        int ans = KTriePatternCount(obj);

return ans;
    }
};

//-------------------------------------------------------------------------
// api
//-------------------------------------------------------------------------

static Mpse* lm_ctor(const SnortConfig*, class Module*, const MpseAgent* agent)
{
    return new LowmemMpse(agent);
}

static void lm_dtor(Mpse* p)
{
    delete p;
}

static void lm_init()
{
    KTrie_init_xlatcase();
    KTrieInitMemUsed();
}

static void lm_print()
{
    if ( !KTrieMemUsed() )
        return;

double x = (double)KTrieMemUsed();

LogMessage("[ LowMem Search-Method Memory Used : %g %s ]\n",
        (x > 1.e+6) ?  x/1.e+6 : x/1.e+3,
        (x > 1.e+6) ? "MBytes" : "KBytes");
}

const BaseApi* se_lowmem = &lm_api.base;