/* Copyright (C) 2011-2022 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 Eric Leblond <eric@regit.org>

 *

 * Replace part of the detection engine.

 *

 * If previous filter is of content type, replace can be used to change

 * the matched part to a new value.

 */

#include "suricata-common.h"

#include "runmodes.h"

#include "decode.h"

#include "detect.h"

#include "detect-parse.h"

#include "detect-content.h"

#include "detect-replace.h"

#include "app-layer.h"

#include "detect-engine-mpm.h"

#include "detect-engine.h"

#include "detect-engine-build.h"

#include "util-checksum.h"

#include "util-unittest.h"

#include "util-debug.h"

static int DetectReplaceSetup(DetectEngineCtx *, Signature *, const char *);

#ifdef UNITTESTS

static void DetectReplaceRegisterTests(void);

#endif

static int DetectReplacePostMatch(DetectEngineThreadCtx *det_ctx,

        Packet *p, const Signature *s, const SigMatchCtx *ctx);

void DetectReplaceRegister (void)

{

    sigmatch_table[DETECT_REPLACE].name = "replace";

    sigmatch_table[DETECT_REPLACE].desc = "only to be used in IPS-mode. Change the following content into another";

    sigmatch_table[DETECT_REPLACE].url = "/rules/payload-keywords.html#replace";

    sigmatch_table[DETECT_REPLACE].Match = DetectReplacePostMatch;

    sigmatch_table[DETECT_REPLACE].Setup = DetectReplaceSetup;

#ifdef UNITTESTS

    sigmatch_table[DETECT_REPLACE].RegisterTests = DetectReplaceRegisterTests;

#endif

    sigmatch_table[DETECT_REPLACE].flags = (SIGMATCH_QUOTES_MANDATORY|SIGMATCH_HANDLE_NEGATION);

}

static int DetectReplacePostMatch(DetectEngineThreadCtx *det_ctx,

        Packet *p, const Signature *s, const SigMatchCtx *ctx)

{

    if (det_ctx->replist) {

        DetectReplaceExecuteInternal(p, det_ctx->replist);

        det_ctx->replist = NULL;

    }

    return 1;

}

int DetectReplaceSetup(DetectEngineCtx *de_ctx, Signature *s, const char *replacestr)

{

    uint8_t *content = NULL;

    uint16_t len = 0;

    if (s->init_data->negated) {

        SCLogError("Can't negate replacement string: %s", replacestr);

        return -1;

    }

    switch (SCRunmodeGet()) {

        case RUNMODE_NFQ:

        case RUNMODE_IPFW:

            break;

        default:

            SCLogWarning("Can't use 'replace' keyword in non IPS mode: %s", s->sig_str);

            /* this is a success, having the alert is interesting */

            return 0;

    }

    int ret = DetectContentDataParse("replace", replacestr, &content, &len);

    if (ret == -1)

        return -1;

    /* add to the latest "content" keyword from pmatch */

    const SigMatch *pm = DetectGetLastSMByListId(s, DETECT_SM_LIST_PMATCH,

            DETECT_CONTENT, -1);

    if (pm == NULL) {

        SCLogError("replace needs"

                   "preceding content option for raw sig");

        SCFree(content);

        return -1;

    }

    /* we can remove this switch now with the unified structure */

    DetectContentData *ud = (DetectContentData *)pm->ctx;

    if (ud == NULL) {

        SCLogError("invalid argument");

        SCFree(content);

        return -1;

    }

    if (ud->flags & DETECT_CONTENT_NEGATED) {

        SCLogError("can't have a relative "

                   "negated keyword set along with a replacement");

        goto error;

    }

    if (ud->content_len != len) {

        SCLogError("can't have a content "

                   "length different from replace length");

        goto error;

    }

    ud->replace = SCMalloc(len);

    if (ud->replace == NULL) {

        goto error;

    }

    memcpy(ud->replace, content, len);

    ud->replace_len = len;

    ud->flags |= DETECT_CONTENT_REPLACE;

    /* want packet matching only won't be able to replace data with

     * a flow.

     */

    s->flags |= SIG_FLAG_REQUIRE_PACKET;

    SCFree(content);

    content = NULL;

    if (SCSigMatchAppendSMToList(de_ctx, s, DETECT_REPLACE, NULL, DETECT_SM_LIST_POSTMATCH) ==

            NULL) {

        goto error;

    }

    return 0;

error:

    SCFree(ud->replace);

    ud->replace = NULL;

    SCFree(content);

    return -1;

}

/* Add to the head of the replace-list.

 *

 * The first to add to the replace-list has the highest priority. So,

 * adding the head of the list results in the newest modifications

 * of content being applied first, so later changes can over ride

 * earlier changes. Thus the highest priority modifications should be

 * applied last.

 */

DetectReplaceList *DetectReplaceAddToList(

        DetectReplaceList *replist, uint8_t *found, const DetectContentData *cd)

{

    if (cd->content_len != cd->replace_len)

        return NULL;

    SCLogDebug("replace: Adding match");

    DetectReplaceList *newlist = SCMalloc(sizeof(DetectReplaceList));

    if (unlikely(newlist == NULL))

        return replist;

    newlist->found = found;

    newlist->cd = cd;

    /* Push new value onto the front of the list. */

    newlist->next = replist;

    return newlist;

}

void DetectReplaceExecuteInternal(Packet *p, DetectReplaceList *replist)

{

    DetectReplaceList *tlist = NULL;

    SCLogDebug("replace: Executing match");

    while (replist) {

        memcpy(replist->found, replist->cd->replace, replist->cd->replace_len);

        SCLogDebug("replace: replaced data");

        p->flags |= PKT_STREAM_MODIFIED;

        ReCalculateChecksum(p);

        tlist = replist;

        replist = replist->next;

        SCFree(tlist);

    }

}

void DetectReplaceFreeInternal(DetectReplaceList *replist)

{

    DetectReplaceList *tlist = NULL;

    while (replist) {

        SCLogDebug("replace: Freeing match");

        tlist = replist;

        replist = replist->next;

        SCFree(tlist);

    }

}

#ifdef UNITTESTS /* UNITTESTS */

#include "detect-engine-alert.h"

#include "packet.h"

/**

 * \test Test packet Matches

 * \param raw_eth_pkt pointer to the ethernet packet

 * \param pktsize size of the packet

 * \param sig pointer to the signature to test

 * \param sid sid number of the signature

 * \retval return 1 if match

 * \retval return 0 if not

 */

static

int DetectReplaceLongPatternMatchTest(uint8_t *raw_eth_pkt, uint16_t pktsize,

                                      const char *sig, uint32_t sid, uint8_t *pp,

                                      uint16_t *len)

{

    int result = 0;

    Packet *p = NULL;

    p = PacketGetFromAlloc();

    if (unlikely(p == NULL))

        return 0;

    DecodeThreadVars dtv;

    ThreadVars th_v;

    DetectEngineThreadCtx *det_ctx = NULL;

    if (pp == NULL) {

        SCLogDebug("replace: looks like a second run");

    }

    PacketCopyData(p, raw_eth_pkt, pktsize);

    memset(&dtv, 0, sizeof(DecodeThreadVars));

    memset(&th_v, 0, sizeof(th_v));

    dtv.app_tctx = AppLayerGetCtxThread();

    FlowInitConfig(FLOW_QUIET);

    DecodeEthernet(&th_v, &dtv, p, GET_PKT_DATA(p), pktsize);

    DetectEngineCtx *de_ctx = DetectEngineCtxInit();

    if (de_ctx == NULL) {

        goto end;

    }

    de_ctx->flags |= DE_QUIET;

    de_ctx->sig_list = SigInit(de_ctx, sig);

    if (de_ctx->sig_list == NULL) {

        goto end;

    }

    de_ctx->sig_list->next = NULL;

    if (de_ctx->sig_list->init_data->smlists_tail[DETECT_SM_LIST_PMATCH]->type == DETECT_CONTENT) {

        DetectContentData *co = (DetectContentData *)de_ctx->sig_list->init_data

                                        ->smlists_tail[DETECT_SM_LIST_PMATCH]

                                        ->ctx;

        if (co->flags & DETECT_CONTENT_RELATIVE_NEXT) {

            printf("relative next flag set on final match which is content: ");

            goto end;

        }

    }

    SigGroupBuild(de_ctx);

    DetectEngineAddToMaster(de_ctx);

    DetectEngineThreadCtxInit(&th_v, NULL, (void *)&det_ctx);

    SigMatchSignatures(&th_v, de_ctx, det_ctx, p);

    DetectEngineMoveToFreeList(de_ctx);

    if (PacketAlertCheck(p, sid) != 1) {

        SCLogDebug("replace: no alert on sig %d", sid);

        goto end;

    }

    if (pp) {

        memcpy(pp, GET_PKT_DATA(p), GET_PKT_LEN(p));

        *len = pktsize;

        SCLogDebug("replace: copying %d on %p", *len, pp);

    }

    result = 1;

end:

    if (dtv.app_tctx != NULL)

        AppLayerDestroyCtxThread(dtv.app_tctx);

    if (det_ctx != NULL)

        DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);

    DetectEnginePruneFreeList();

    PacketRecycle(p);

    FlowShutdown();

    SCFree(p);

    return result;

}

/**

 * \brief Wrapper for DetectContentLongPatternMatchTest

 */

static int DetectReplaceLongPatternMatchTestWrp(const char *sig, uint32_t sid, const char *sig_rep,  uint32_t sid_rep)

{

    int ret;

    /** Real packet with the following tcp data:

     * "Hi, this is a big test to check content matches of splitted"

     * "patterns between multiple chunks!"

     * (without quotes! :) )

     */

    uint8_t raw_eth_pkt[] = {

        0xff,0xff,0xff,0xff,0xff,0xff,0x00,0x00,

        0x00,0x00,0x00,0x00,0x08,0x00,0x45,0x00,

        0x00,0x85,0x00,0x01,0x00,0x00,0x40,0x06,

        0x7c,0x70,0x7f,0x00,0x00,0x01,0x7f,0x00,

        0x00,0x01,0x00,0x14,0x00,0x50,0x00,0x00,

        0x00,0x00,0x00,0x00,0x00,0x00,0x50,0x02,

        0x20,0x00,0xc9,0xad,0x00,0x00,0x48,0x69,

        0x2c,0x20,0x74,0x68,0x69,0x73,0x20,0x69,

        0x73,0x20,0x61,0x20,0x62,0x69,0x67,0x20,

        0x74,0x65,0x73,0x74,0x20,0x74,0x6f,0x20,

        0x63,0x68,0x65,0x63,0x6b,0x20,0x63,0x6f,

        0x6e,0x74,0x65,0x6e,0x74,0x20,0x6d,0x61,

        0x74,0x63,0x68,0x65,0x73,0x20,0x6f,0x66,

        0x20,0x73,0x70,0x6c,0x69,0x74,0x74,0x65,

        0x64,0x20,0x70,0x61,0x74,0x74,0x65,0x72,

        0x6e,0x73,0x20,0x62,0x65,0x74,0x77,0x65,

        0x65,0x6e,0x20,0x6d,0x75,0x6c,0x74,0x69,

        0x70,0x6c,0x65,0x20,0x63,0x68,0x75,0x6e,

        0x6b,0x73,0x21 }; /* end raw_eth_pkt */

    uint8_t p[sizeof(raw_eth_pkt)];

    uint16_t psize = sizeof(raw_eth_pkt);

    /* would be unittest */

    int run_mode_backup = SCRunmodeGet();

    SCRunmodeSet(RUNMODE_NFQ);

    ret = DetectReplaceLongPatternMatchTest(raw_eth_pkt, (uint16_t)sizeof(raw_eth_pkt),

                             sig, sid, p, &psize);

    if (ret == 1) {

        SCLogDebug("replace: test1 phase1");

        ret = DetectReplaceLongPatternMatchTest(p, psize, sig_rep, sid_rep, NULL, NULL);

    }

    SCRunmodeSet(run_mode_backup);

    return ret;

}

/**

 * \brief Wrapper for DetectContentLongPatternMatchTest

 */

static int DetectReplaceLongPatternMatchTestUDPWrp(const char *sig, uint32_t sid, const char *sig_rep,  uint32_t sid_rep)

{

    int ret;

    /** Real UDP DNS packet with a request A to a1.twimg.com

     */

    uint8_t raw_eth_pkt[] = {

        0x8c, 0xa9, 0x82, 0x75, 0x5d, 0x62, 0xb4, 0x07, 

        0xf9, 0xf3, 0xc7, 0x0a, 0x08, 0x00, 0x45, 0x00, 

        0x00, 0x3a, 0x92, 0x4f, 0x40, 0x00, 0x40, 0x11, 

        0x31, 0x1a, 0xc0, 0xa8, 0x00, 0x02, 0xc1, 0xbd, 

        0xf4, 0xe1, 0x3b, 0x7e, 0x00, 0x35, 0x00, 0x26, 

        0xcb, 0x81, 0x37, 0x62, 0x01, 0x00, 0x00, 0x01, 

        0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0x61, 

        0x31, 0x05, 0x74, 0x77, 0x69, 0x6d, 0x67, 0x03, 

        0x63, 0x6f, 0x6d, 0x00, 0x00, 0x01, 0x00, 0x01 };

    uint8_t p[sizeof(raw_eth_pkt)];

    uint16_t psize = sizeof(raw_eth_pkt);

    int run_mode_backup = SCRunmodeGet();

    SCRunmodeSet(RUNMODE_NFQ);

    ret = DetectReplaceLongPatternMatchTest(raw_eth_pkt, (uint16_t)sizeof(raw_eth_pkt),

                             sig, sid, p, &psize);

    if (ret == 1) {

        SCLogDebug("replace: test1 phase1 ok: %" PRIuMAX" vs %d",(uintmax_t)sizeof(raw_eth_pkt),psize);

        ret = DetectReplaceLongPatternMatchTest(p, psize, sig_rep, sid_rep, NULL, NULL);

    }

    SCRunmodeSet(run_mode_backup);

    return ret;

}

/**

 * \test Check if replace is working

 */

static int DetectReplaceMatchTest01(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"big\"; replace:\"pig\"; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"this is a pig test\"; sid:2;)";

    FAIL_IF_NOT(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working with offset

 */

static int DetectReplaceMatchTest02(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"th\"; offset: 4; replace:\"TH\"; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"THis\"; offset:4; sid:2;)";

    FAIL_IF_NOT(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working with offset and keyword inversion

 */

static int DetectReplaceMatchTest03(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"th\"; replace:\"TH\"; offset: 4; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"THis\"; offset:4; sid:2;)";

    FAIL_IF_NOT(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working with second content

 */

static int DetectReplaceMatchTest04(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"th\"; replace:\"TH\"; content:\"patter\"; replace:\"matter\"; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"THis\"; content:\"matterns\"; sid:2;)";

    FAIL_IF_NOT(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is not done when second content don't match

 */

static int DetectReplaceMatchTest05(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"th\"; replace:\"TH\"; content:\"nutella\"; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"TH\"; sid:2;)";

    FAIL_IF(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is not done when second content match and not

 * first

 */

static int DetectReplaceMatchTest06(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"nutella\"; replace:\"commode\"; content:\"this is\"; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"commode\"; sid:2;)";

    FAIL_IF(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working when nocase used

 */

static int DetectReplaceMatchTest07(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"BiG\"; nocase; replace:\"pig\"; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"this is a pig test\"; sid:2;)";

    FAIL_IF_NOT(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working when depth is used

 */

static int DetectReplaceMatchTest08(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"big\"; depth:17; replace:\"pig\"; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"this is a pig test\"; sid:2;)";

    FAIL_IF_NOT(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working when depth block match used

 */

static int DetectReplaceMatchTest09(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"big\"; depth:16; replace:\"pig\"; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"this is a pig test\"; sid:2;)";

    FAIL_IF(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working when depth block match used

 */

static int DetectReplaceMatchTest10(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"big\"; depth:17; replace:\"pig\"; offset: 14; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"pig\"; depth:17; offset:14; sid:2;)";

    FAIL_IF_NOT(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working with within

 */

static int DetectReplaceMatchTest11(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"big\"; replace:\"pig\"; content:\"to\"; within: 11; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"pig\"; depth:17; offset:14; sid:2;)";

    FAIL_IF_NOT(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working with within

 */

static int DetectReplaceMatchTest12(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"big\"; replace:\"pig\"; content:\"to\"; within: 4; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"pig\"; depth:17; offset:14; sid:2;)";

    FAIL_IF(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working with within

 */

static int DetectReplaceMatchTest13(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"big\"; replace:\"pig\"; content:\"test\"; distance: 1; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"pig\"; depth:17; offset:14; sid:2;)";

    FAIL_IF_NOT(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working with within

 */

static int DetectReplaceMatchTest14(void)

{

    const char *sig = "alert tcp any any -> any any (msg:\"Nothing..\";"

                " content:\"big\"; replace:\"pig\"; content:\"test\"; distance: 2; sid:1;)";

    const char *sig_rep = "alert tcp any any -> any any (msg:\"replace worked\";"

                " content:\"pig\"; depth:17; offset:14; sid:2;)";

    FAIL_IF(DetectReplaceLongPatternMatchTestWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Check if replace is working with within

 */

static int DetectReplaceMatchTest15(void)

{

    const char *sig = "alert udp any any -> any any (msg:\"Nothing..\";"

                " content:\"com\"; replace:\"org\"; sid:1;)";

    const char *sig_rep = "alert udp any any -> any any (msg:\"replace worked\";"

                " content:\"twimg|03|org\"; sid:2;)";

    FAIL_IF_NOT(DetectReplaceLongPatternMatchTestUDPWrp(sig, 1, sig_rep, 2));

    PASS;

}

/**

 * \test Parsing test

 */

static int DetectReplaceParseTest01(void)

{

    int run_mode_backup = SCRunmodeGet();

    SCRunmodeSet(RUNMODE_NFQ);

    DetectEngineCtx *de_ctx = DetectEngineCtxInit();

    FAIL_IF_NULL(de_ctx);

    de_ctx->flags |= DE_QUIET;

    FAIL_IF_NOT_NULL(DetectEngineAppendSig(de_ctx,

            "alert udp any any -> any any "

            "(msg:\"test\"; content:\"doh\"; replace:\"; sid:238012;)"));

    SCRunmodeSet(run_mode_backup);

    DetectEngineCtxFree(de_ctx);

    PASS;

}

/**

 * \test Parsing test: non valid because of http protocol

 */

static int DetectReplaceParseTest02(void)

{

    int run_mode_backup = SCRunmodeGet();

    SCRunmodeSet(RUNMODE_NFQ);

    DetectEngineCtx *de_ctx = DetectEngineCtxInit();

    FAIL_IF_NULL(de_ctx);

    de_ctx->flags |= DE_QUIET;

    FAIL_IF_NULL(DetectEngineAppendSig(de_ctx,

            "alert http any any -> any any "

            "(msg:\"test\"; content:\"doh\"; replace:\"bon\"; sid:238012;)"));

    SCRunmodeSet(run_mode_backup);

    DetectEngineCtxFree(de_ctx);

    PASS;

}

/**

 * \test Parsing test: non valid because of http_header on same content

 * as replace keyword

 */

static int DetectReplaceParseTest03(void)

{

    int run_mode_backup = SCRunmodeGet();

    SCRunmodeSet(RUNMODE_NFQ);

    DetectEngineCtx *de_ctx = DetectEngineCtxInit();

    FAIL_IF_NULL(de_ctx);

    de_ctx->flags |= DE_QUIET;

    FAIL_IF_NOT_NULL(DetectEngineAppendSig(de_ctx,

            "alert tcp any any -> any any "

            "(msg:\"test\"; content:\"doh\"; replace:\"don\"; http_header; sid:238012;)"));

    SCRunmodeSet(run_mode_backup);

    DetectEngineCtxFree(de_ctx);

    PASS;

}

/**

 * \test Parsing test no content

 */

static int DetectReplaceParseTest04(void)

{

    int run_mode_backup = SCRunmodeGet();

    SCRunmodeSet(RUNMODE_NFQ);

    DetectEngineCtx *de_ctx = DetectEngineCtxInit();

    FAIL_IF_NULL(de_ctx);

    de_ctx->flags |= DE_QUIET;

    FAIL_IF_NOT_NULL(DetectEngineAppendSig(de_ctx, "alert tcp any any -> any any "

                                                   "(msg:\"test\"; replace:\"don\"; sid:238012;)"));

    SCRunmodeSet(run_mode_backup);

    DetectEngineCtxFree(de_ctx);

    PASS;

}

/**

 * \test Parsing test content after replace

 */

static int DetectReplaceParseTest05(void)

{

    int run_mode_backup = SCRunmodeGet();

    SCRunmodeSet(RUNMODE_NFQ);

    DetectEngineCtx *de_ctx = DetectEngineCtxInit();

    FAIL_IF_NULL(de_ctx);

    de_ctx->flags |= DE_QUIET;

    FAIL_IF_NOT_NULL(DetectEngineAppendSig(de_ctx,

            "alert tcp any any -> any any "

            "(msg:\"test\"; replace:\"don\"; content:\"doh\"; sid:238012;)"));

    SCRunmodeSet(run_mode_backup);

    DetectEngineCtxFree(de_ctx);

    PASS;

}

/**

 * \test Parsing test content and replace length differ

 */

static int DetectReplaceParseTest06(void)

{

    int run_mode_backup = SCRunmodeGet();

    SCRunmodeSet(RUNMODE_NFQ);

    DetectEngineCtx *de_ctx = DetectEngineCtxInit();

    FAIL_IF_NULL(de_ctx);

    de_ctx->flags |= DE_QUIET;

    FAIL_IF_NOT_NULL(DetectEngineAppendSig(de_ctx,

            "alert tcp any any -> any any "

            "(msg:\"test\"; content:\"don\"; replace:\"donut\"; sid:238012;)"));

    SCRunmodeSet(run_mode_backup);

    DetectEngineCtxFree(de_ctx);

    PASS;

}

/**

 * \test Parsing test content and replace length differ

 */

static int DetectReplaceParseTest07(void)

{

    int run_mode_backup = SCRunmodeGet();

    SCRunmodeSet(RUNMODE_NFQ);

    DetectEngineCtx *de_ctx = DetectEngineCtxInit();

    FAIL_IF_NULL(de_ctx);

    de_ctx->flags |= DE_QUIET;

    FAIL_IF_NOT_NULL(

            DetectEngineAppendSig(de_ctx, "alert tcp any any -> any any "

                                          "(msg:\"test\"; content:\"don\"; replace:\"dou\"; "

                                          "content:\"jpg\"; http_header; sid:238012;)"));

    SCRunmodeSet(run_mode_backup);

    DetectEngineCtxFree(de_ctx);

    PASS;

}

/**

 * \brief this function registers unit tests for DetectContent

 */

void DetectReplaceRegisterTests(void)

{

/* matching */

    UtRegisterTest("DetectReplaceMatchTest01", DetectReplaceMatchTest01);

    UtRegisterTest("DetectReplaceMatchTest02", DetectReplaceMatchTest02);

    UtRegisterTest("DetectReplaceMatchTest03", DetectReplaceMatchTest03);

    UtRegisterTest("DetectReplaceMatchTest04", DetectReplaceMatchTest04);

    UtRegisterTest("DetectReplaceMatchTest05", DetectReplaceMatchTest05);

    UtRegisterTest("DetectReplaceMatchTest06", DetectReplaceMatchTest06);

    UtRegisterTest("DetectReplaceMatchTest07", DetectReplaceMatchTest07);

    UtRegisterTest("DetectReplaceMatchTest08", DetectReplaceMatchTest08);

    UtRegisterTest("DetectReplaceMatchTest09", DetectReplaceMatchTest09);

    UtRegisterTest("DetectReplaceMatchTest10", DetectReplaceMatchTest10);

    UtRegisterTest("DetectReplaceMatchTest11", DetectReplaceMatchTest11);

    UtRegisterTest("DetectReplaceMatchTest12", DetectReplaceMatchTest12);

    UtRegisterTest("DetectReplaceMatchTest13", DetectReplaceMatchTest13);

    UtRegisterTest("DetectReplaceMatchTest14", DetectReplaceMatchTest14);

    UtRegisterTest("DetectReplaceMatchTest15", DetectReplaceMatchTest15);

/* parsing */

    UtRegisterTest("DetectReplaceParseTest01", DetectReplaceParseTest01);

    UtRegisterTest("DetectReplaceParseTest02", DetectReplaceParseTest02);

    UtRegisterTest("DetectReplaceParseTest03", DetectReplaceParseTest03);

    UtRegisterTest("DetectReplaceParseTest04", DetectReplaceParseTest04);

    UtRegisterTest("DetectReplaceParseTest05", DetectReplaceParseTest05);

    UtRegisterTest("DetectReplaceParseTest06", DetectReplaceParseTest06);

    UtRegisterTest("DetectReplaceParseTest07", DetectReplaceParseTest07);

}

#endif /* UNITTESTS */