/* Copyright (C) 2007-2020 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>

 *

 * FLOW part of the detection engine.

 */

#include "suricata-common.h"

#include "decode.h"

#include "detect.h"

#include "detect-parse.h"

#include "detect-engine.h"

#include "detect-engine-prefilter-common.h"

#include "detect-engine-build.h"

#include "flow.h"

#include "flow-var.h"

#include "detect-flow.h"

#include "util-unittest.h"

#include "util-unittest-helper.h"

#include "util-debug.h"

/**

 * \brief Regex for parsing our flow options

 */

#define PARSE_REGEX  "^\\s*([A-z_]+)\\s*(?:,\\s*([A-z_]+))?\\s*(?:,\\s*([A-z_]+))?\\s*$"

static DetectParseRegex parse_regex;

int DetectFlowMatch (DetectEngineThreadCtx *, Packet *,

        const Signature *, const SigMatchCtx *);

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

#ifdef UNITTESTS

static void DetectFlowRegisterTests(void);

#endif

void DetectFlowFree(DetectEngineCtx *, void *);

static int PrefilterSetupFlow(DetectEngineCtx *de_ctx, SigGroupHead *sgh);

static bool PrefilterFlowIsPrefilterable(const Signature *s);

/**

 * \brief Registration function for flow: keyword

 */

void DetectFlowRegister (void)

{

    sigmatch_table[DETECT_FLOW].name = "flow";

    sigmatch_table[DETECT_FLOW].desc = "match on direction and state of the flow";

    sigmatch_table[DETECT_FLOW].url = "/rules/flow-keywords.html#flow";

    sigmatch_table[DETECT_FLOW].Match = DetectFlowMatch;

    sigmatch_table[DETECT_FLOW].Setup = DetectFlowSetup;

    sigmatch_table[DETECT_FLOW].Free  = DetectFlowFree;

    sigmatch_table[DETECT_FLOW].flags = SIGMATCH_SUPPORT_FIREWALL;

#ifdef UNITTESTS

    sigmatch_table[DETECT_FLOW].RegisterTests = DetectFlowRegisterTests;

#endif

    sigmatch_table[DETECT_FLOW].SupportsPrefilter = PrefilterFlowIsPrefilterable;

    sigmatch_table[DETECT_FLOW].SetupPrefilter = PrefilterSetupFlow;

    /* all but pre_flow */

    sigmatch_table[DETECT_FLOW].tables =

            DETECT_TABLE_PACKET_PRE_STREAM_FLAG | DETECT_TABLE_PACKET_FILTER_FLAG |

            DETECT_TABLE_PACKET_TD_FLAG | DETECT_TABLE_APP_FILTER_FLAG | DETECT_TABLE_APP_TD_FLAG;

    DetectSetupParseRegexes(PARSE_REGEX, &parse_regex);

}

/**

 * \param pflags packet flags (p->flags)

 * \param pflowflags packet flow flags (p->flowflags)

 * \param dflags detect flow flags

 * \param match_cnt number of matches to trigger

 */

static inline int FlowMatch(const uint32_t pflags, const uint8_t pflowflags, const uint16_t dflags,

        const uint16_t match_cnt)

{

    uint8_t cnt = 0;

    if ((dflags & DETECT_FLOW_FLAG_NO_FRAG) &&

        (!(pflags & PKT_REBUILT_FRAGMENT))) {

        cnt++;

    } else if ((dflags & DETECT_FLOW_FLAG_ONLY_FRAG) &&

        (pflags & PKT_REBUILT_FRAGMENT)) {

        cnt++;

    }

    if ((dflags & DETECT_FLOW_FLAG_TOSERVER) && (pflowflags & FLOW_PKT_TOSERVER)) {

        cnt++;

    } else if ((dflags & DETECT_FLOW_FLAG_TOCLIENT) && (pflowflags & FLOW_PKT_TOCLIENT)) {

        cnt++;

    }

    if ((dflags & DETECT_FLOW_FLAG_ESTABLISHED) && (pflowflags & FLOW_PKT_ESTABLISHED)) {

        cnt++;

    } else if (dflags & DETECT_FLOW_FLAG_NOT_ESTABLISHED && (!(pflowflags & FLOW_PKT_ESTABLISHED))) {

        cnt++;

    } else if (dflags & DETECT_FLOW_FLAG_STATELESS) {

        cnt++;

    }

    return (match_cnt == cnt) ? 1 : 0;

}

/**

 * \brief This function is used to match flow flags set on a packet with those passed via flow:

 *

 * \param t pointer to thread vars

 * \param det_ctx pointer to the pattern matcher thread

 * \param p pointer to the current packet

 * \param m pointer to the sigmatch that we will cast into DetectFlowData

 *

 * \retval 0 no match

 * \retval 1 match

 */

int DetectFlowMatch (DetectEngineThreadCtx *det_ctx, Packet *p,

        const Signature *s, const SigMatchCtx *ctx)

{

    SCEnter();

    SCLogDebug("pkt %p", p);

    if (p->flowflags & FLOW_PKT_TOSERVER) {

        SCLogDebug("FLOW_PKT_TOSERVER");

    } else if (p->flowflags & FLOW_PKT_TOCLIENT) {

        SCLogDebug("FLOW_PKT_TOCLIENT");

    }

    if (p->flowflags & FLOW_PKT_ESTABLISHED) {

        SCLogDebug("FLOW_PKT_ESTABLISHED");

    }

    const DetectFlowData *fd = (const DetectFlowData *)ctx;

    const int ret = FlowMatch(p->flags, p->flowflags, fd->flags, fd->match_cnt);

    SCLogDebug("returning %" PRId32 " fd->match_cnt %" PRId32 " fd->flags 0x%02X p->flowflags 0x%02X",

        ret, fd->match_cnt, fd->flags, p->flowflags);

    SCReturnInt(ret);

}

/**

 * \brief This function is used to parse flow options passed via flow: keyword

 *

 * \param de_ctx Pointer to the detection engine context

 * \param flowstr Pointer to the user provided flow options

 * \param[out] parse_flags keyword flags only used during parsing

 *

 * \retval fd pointer to DetectFlowData on success

 * \retval NULL on failure

 */

static DetectFlowData *DetectFlowParse(

        DetectEngineCtx *de_ctx, const char *flowstr, uint16_t *parse_flags)

{

    DetectFlowData *fd = NULL;

    char *args[3] = {NULL,NULL,NULL};

    int res = 0;

    size_t pcre2len;

    char str1[16] = "", str2[16] = "", str3[16] = "";

    pcre2_match_data *match = NULL;

    int ret = DetectParsePcreExec(&parse_regex, &match, flowstr, 0, 0);

    if (ret < 1 || ret > 4) {

        SCLogError("parse error, ret %" PRId32 ", string %s", ret, flowstr);

        goto error;

    }

    if (ret > 1) {

        pcre2len = sizeof(str1);

        res = SC_Pcre2SubstringCopy(match, 1, (PCRE2_UCHAR8 *)str1, &pcre2len);

        if (res < 0) {

            SCLogError("pcre2_substring_copy_bynumber failed");

            goto error;

        }

        args[0] = (char *)str1;

        if (ret > 2) {

            pcre2len = sizeof(str2);

            res = pcre2_substring_copy_bynumber(match, 2, (PCRE2_UCHAR8 *)str2, &pcre2len);

            if (res < 0) {

                SCLogError("pcre2_substring_copy_bynumber failed");

                goto error;

            }

            args[1] = (char *)str2;

        }

        if (ret > 3) {

            pcre2len = sizeof(str3);

            res = pcre2_substring_copy_bynumber(match, 3, (PCRE2_UCHAR8 *)str3, &pcre2len);

            if (res < 0) {

                SCLogError("pcre2_substring_copy_bynumber failed");

                goto error;

            }

            args[2] = (char *)str3;

        }

    }

    fd = SCMalloc(sizeof(DetectFlowData));

    if (unlikely(fd == NULL))

        goto error;

    fd->flags = 0;

    fd->match_cnt = 0;

    for (int i = 0; i < (ret - 1); i++) {

        if (args[i]) {

            /* inspect our options and set the flags */

            if (strcasecmp(args[i], "established") == 0) {

                if (fd->flags & DETECT_FLOW_FLAG_ESTABLISHED) {

                    SCLogError("DETECT_FLOW_FLAG_ESTABLISHED flag is already set");

                    goto error;

                } else if (fd->flags & DETECT_FLOW_FLAG_NOT_ESTABLISHED) {

                    SCLogError("cannot set DETECT_FLOW_FLAG_ESTABLISHED, "

                               "DETECT_FLOW_FLAG_NOT_ESTABLISHED already set");

                    goto error;

                } else if (fd->flags & DETECT_FLOW_FLAG_STATELESS) {

                    SCLogError("DETECT_FLOW_FLAG_STATELESS already set");

                    goto error;

                }

                fd->flags |= DETECT_FLOW_FLAG_ESTABLISHED;

                fd->match_cnt++;

            } else if (strcasecmp(args[i], "not_established") == 0) {

                if (fd->flags & DETECT_FLOW_FLAG_NOT_ESTABLISHED) {

                    SCLogError("DETECT_FLOW_FLAG_NOT_ESTABLISHED flag is already set");

                    goto error;

                } else if (fd->flags & DETECT_FLOW_FLAG_ESTABLISHED) {

                    SCLogError("cannot set DETECT_FLOW_FLAG_NOT_ESTABLISHED, "

                               "DETECT_FLOW_FLAG_ESTABLISHED already set");

                    goto error;

                }

                fd->flags |= DETECT_FLOW_FLAG_NOT_ESTABLISHED;

                fd->match_cnt++;

            } else if (strcasecmp(args[i], "stateless") == 0) {

                if (fd->flags & DETECT_FLOW_FLAG_STATELESS) {

                    SCLogError("DETECT_FLOW_FLAG_STATELESS flag is already set");

                    goto error;

                } else if (fd->flags & DETECT_FLOW_FLAG_ESTABLISHED) {

                    SCLogError("cannot set DETECT_FLOW_FLAG_STATELESS, "

                               "DETECT_FLOW_FLAG_ESTABLISHED already set");

                    goto error;

                }

                fd->flags |= DETECT_FLOW_FLAG_STATELESS;

                fd->match_cnt++;

            } else if (strcasecmp(args[i], "to_client") == 0 || strcasecmp(args[i], "from_server") == 0) {

                if (fd->flags & DETECT_FLOW_FLAG_TOCLIENT) {

                    SCLogError("cannot set DETECT_FLOW_FLAG_TOCLIENT flag is already set");

                    goto error;

                } else if (fd->flags & DETECT_FLOW_FLAG_TOSERVER) {

                    SCLogError("cannot set to_client, DETECT_FLOW_FLAG_TOSERVER already set");

                    goto error;

                }

                fd->flags |= DETECT_FLOW_FLAG_TOCLIENT;

                fd->match_cnt++;

            } else if (strcasecmp(args[i], "to_server") == 0 || strcasecmp(args[i], "from_client") == 0){

                if (fd->flags & DETECT_FLOW_FLAG_TOSERVER) {

                    SCLogError("cannot set DETECT_FLOW_FLAG_TOSERVER flag is already set");

                    goto error;

                } else if (fd->flags & DETECT_FLOW_FLAG_TOCLIENT) {

                    SCLogError("cannot set to_server, DETECT_FLOW_FLAG_TO_CLIENT flag already set");

                    goto error;

                }

                fd->flags |= DETECT_FLOW_FLAG_TOSERVER;

                fd->match_cnt++;

            } else if (strcasecmp(args[i], "no_frag") == 0) {

                if (fd->flags & DETECT_FLOW_FLAG_NO_FRAG) {

                    SCLogError("cannot set no_frag flag is already set");

                    goto error;

                } else if (fd->flags & DETECT_FLOW_FLAG_ONLY_FRAG) {

                    SCLogError("cannot set no_frag flag, only_frag already set");

                    goto error;

                }

                fd->flags |= DETECT_FLOW_FLAG_NO_FRAG;

                fd->match_cnt++;

            } else if (strcasecmp(args[i], "only_frag") == 0) {

                if (fd->flags & DETECT_FLOW_FLAG_ONLY_FRAG) {

                    SCLogError("cannot set only_frag flag is already set");

                    goto error;

                } else if (fd->flags & DETECT_FLOW_FLAG_NO_FRAG) {

                    SCLogError("cannot set only_frag flag, no_frag already set");

                    goto error;

                }

                fd->flags |= DETECT_FLOW_FLAG_ONLY_FRAG;

                fd->match_cnt++;

                /* special case: these only affect parsing, not matching */

            } else if (strcasecmp(args[i], "only_stream") == 0) {

                if (*parse_flags & DETECT_FLOW_FLAG_ONLYSTREAM) {

                    SCLogError("cannot set only_stream flag is already set");

                    goto error;

                } else if (*parse_flags & DETECT_FLOW_FLAG_NOSTREAM) {

                    SCLogError(

                            "cannot set only_stream flag, DETECT_FLOW_FLAG_NOSTREAM already set");

                    goto error;

                }

                *parse_flags |= DETECT_FLOW_FLAG_ONLYSTREAM;

            } else if (strcasecmp(args[i], "no_stream") == 0) {

                if (*parse_flags & DETECT_FLOW_FLAG_NOSTREAM) {

                    SCLogError("cannot set no_stream flag is already set");

                    goto error;

                } else if (*parse_flags & DETECT_FLOW_FLAG_ONLYSTREAM) {

                    SCLogError(

                            "cannot set no_stream flag, DETECT_FLOW_FLAG_ONLYSTREAM already set");

                    goto error;

                }

                *parse_flags |= DETECT_FLOW_FLAG_NOSTREAM;

            } else {

                SCLogError("invalid flow option \"%s\"", args[i]);

                goto error;

            }

        }

    }

    pcre2_match_data_free(match);

    return fd;

error:

    if (match) {

        pcre2_match_data_free(match);

    }

    if (fd != NULL)

        DetectFlowFree(de_ctx, fd);

    return NULL;

}

int DetectFlowSetupImplicit(Signature *s, uint32_t flags)

{

#define SIG_FLAG_BOTH (SIG_FLAG_TOSERVER|SIG_FLAG_TOCLIENT)

    BUG_ON(flags == 0);

    BUG_ON(flags & ~SIG_FLAG_BOTH);

    BUG_ON((flags & SIG_FLAG_BOTH) == SIG_FLAG_BOTH);

    SCLogDebug("want %08x", flags & SIG_FLAG_BOTH);

    SCLogDebug("have %08x", s->flags & SIG_FLAG_BOTH);

    if (flags & SIG_FLAG_TOSERVER) {

        if ((s->flags & SIG_FLAG_BOTH) == SIG_FLAG_BOTH) {

            /* both is set if we just have 'flow:established' */

            s->flags &= ~SIG_FLAG_TOCLIENT;

        } else if (s->flags & SIG_FLAG_TOCLIENT) {

            return -1;

        }

        s->flags |= SIG_FLAG_TOSERVER;

    } else {

        if ((s->flags & SIG_FLAG_BOTH) == SIG_FLAG_BOTH) {

            /* both is set if we just have 'flow:established' */

            s->flags &= ~SIG_FLAG_TOSERVER;

        } else if (s->flags & SIG_FLAG_TOSERVER) {

            return -1;

        }

        s->flags |= SIG_FLAG_TOCLIENT;

    }

    return 0;

#undef SIG_FLAG_BOTH

}

/**

 * \brief this function is used to add the parsed flowdata into the current signature

 *

 * \param de_ctx pointer to the Detection Engine Context

 * \param s pointer to the Current Signature

 * \param flowstr pointer to the user provided flow options

 *

 * \retval 0 on Success

 * \retval -1 on Failure

 */

int DetectFlowSetup (DetectEngineCtx *de_ctx, Signature *s, const char *flowstr)

{

    uint16_t parse_flags = 0;

    /* ensure only one flow option */

    if (s->init_data->init_flags & SIG_FLAG_INIT_FLOW) {

        SCLogError("A signature may have only one flow option.");

        return -1;

    }

    DetectFlowData *fd = DetectFlowParse(de_ctx, flowstr, &parse_flags);

    if (fd == NULL)

        return -1;

    bool appendsm = true;

    /* set the signature direction flags */

    if (fd->flags & DETECT_FLOW_FLAG_TOSERVER) {

        if (s->flags & SIG_FLAG_TXBOTHDIR) {

            SCLogError(

                    "rule %u means to use both directions, cannot specify a flow direction", s->id);

            goto error;

        }

        if (s->flags & SIG_FLAG_TOCLIENT) {

            SCLogError("rule %u has flow to_server but a hook to_client", s->id);

            goto error;

        }

        s->flags |= SIG_FLAG_TOSERVER;

    } else if (fd->flags & DETECT_FLOW_FLAG_TOCLIENT) {

        if (s->flags & SIG_FLAG_TXBOTHDIR) {

            SCLogError(

                    "rule %u means to use both directions, cannot specify a flow direction", s->id);

            goto error;

        }

        if (s->flags & SIG_FLAG_TOSERVER) {

            SCLogError("rule %u has flow to_client but a hook to_server", s->id);

            goto error;

        }

        s->flags |= SIG_FLAG_TOCLIENT;

    } else {

        /* if direction wasn't already set, e.g. by rule hook, assume both */

        if ((s->flags & (SIG_FLAG_TOSERVER | SIG_FLAG_TOCLIENT)) == 0) {

            s->flags |= SIG_FLAG_TOSERVER;

            s->flags |= SIG_FLAG_TOCLIENT;

        }

    }

    if (fd->flags == 0 || fd->flags == DETECT_FLOW_FLAG_TOSERVER ||

            fd->flags == DETECT_FLOW_FLAG_TOCLIENT) {

        /* no direct flow is needed for just direction,

         * no sigmatch is needed either. */

        appendsm = false;

    } else {

        s->init_data->init_flags |= SIG_FLAG_INIT_FLOW;

    }

    if (appendsm) {

        if (SCSigMatchAppendSMToList(

                    de_ctx, s, DETECT_FLOW, (SigMatchCtx *)fd, DETECT_SM_LIST_MATCH) == NULL) {

            goto error;

        }

    } else {

        DetectFlowFree(de_ctx, fd);

    }

    if (parse_flags & DETECT_FLOW_FLAG_ONLYSTREAM) {

        s->flags |= (SIG_FLAG_REQUIRE_STREAM | SIG_FLAG_REQUIRE_STREAM_ONLY);

    }

    if (parse_flags & DETECT_FLOW_FLAG_NOSTREAM) {

        s->flags |= SIG_FLAG_REQUIRE_PACKET;

    }

    return 0;

error:

    if (fd != NULL)

        DetectFlowFree(de_ctx, fd);

    return -1;

}

/**

 * \brief this function will free memory associated with DetectFlowData

 *

 * \param fd pointer to DetectFlowData

 */

void DetectFlowFree(DetectEngineCtx *de_ctx, void *ptr)

{

    DetectFlowData *fd = (DetectFlowData *)ptr;

    SCFree(fd);

}

static void

PrefilterPacketFlowMatch(DetectEngineThreadCtx *det_ctx, Packet *p, const void *pectx)

{

    SCEnter();

    const PrefilterPacketHeaderCtx *ctx = pectx;

    if (!PrefilterPacketHeaderExtraMatch(ctx, p))

        return;

    if (FlowMatch(p->flags, p->flowflags, ctx->v1.u16[0], ctx->v1.u16[1])) {

        SCLogDebug("match: adding sids");

        PrefilterAddSids(&det_ctx->pmq, ctx->sigs_array, ctx->sigs_cnt);

    }

    SCReturn;

}

static void

PrefilterPacketFlowSet(PrefilterPacketHeaderValue *v, void *smctx)

{

    const DetectFlowData *fb = smctx;

    v->u16[0] = fb->flags;

    v->u16[1] = fb->match_cnt;

}

static bool

PrefilterPacketFlowCompare(PrefilterPacketHeaderValue v, void *smctx)

{

    const DetectFlowData *fb = smctx;

    if (v.u16[0] == fb->flags && v.u16[1] == fb->match_cnt) {

        return true;

    }

    return false;

}

static int PrefilterSetupFlow(DetectEngineCtx *de_ctx, SigGroupHead *sgh)

{

    return PrefilterSetupPacketHeader(de_ctx, sgh, DETECT_FLOW, 0, PrefilterPacketFlowSet,

            PrefilterPacketFlowCompare, PrefilterPacketFlowMatch);

}

static bool PrefilterFlowIsPrefilterable(const Signature *s)

{

    const SigMatch *sm;

    for (sm = s->init_data->smlists[DETECT_SM_LIST_MATCH] ; sm != NULL; sm = sm->next) {

        switch (sm->type) {

            case DETECT_FLOW:

                return true;

        }

    }

    return false;

}

#ifdef UNITTESTS

#include "detect-engine-alert.h"

/**

 * \test DetectFlowTestParse01 is a test to make sure that we return "something"

 *  when given valid flow opt

 */

static int DetectFlowTestParse01 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "established", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(parsed_flags == 0);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse02 is a test for setting the established flow opt

 */

static int DetectFlowTestParse02 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "established", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_ESTABLISHED &&

        fd->match_cnt == 1);

    PASS;

}

/**

 * \test DetectFlowTestParse03 is a test for setting the stateless flow opt

 */

static int DetectFlowTestParse03 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "stateless", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_STATELESS && fd->match_cnt == 1);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse04 is a test for setting the to_client flow opt

 */

static int DetectFlowTestParse04 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "to_client", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_TOCLIENT && fd->match_cnt == 1);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse05 is a test for setting the to_server flow opt

 */

static int DetectFlowTestParse05 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "to_server", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_TOSERVER && fd->match_cnt == 1);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse06 is a test for setting the from_server flow opt

 */

static int DetectFlowTestParse06 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "from_server", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_TOCLIENT && fd->match_cnt == 1);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse07 is a test for setting the from_client flow opt

 */

static int DetectFlowTestParse07 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "from_client", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_TOSERVER && fd->match_cnt == 1);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse08 is a test for setting the established,to_client flow opts

 */

static int DetectFlowTestParse08 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "established,to_client", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_ESTABLISHED && fd->flags & DETECT_FLOW_FLAG_TOCLIENT && fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse09 is a test for setting the to_client,stateless flow opts (order of state,dir reversed)

 */

static int DetectFlowTestParse09 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "to_client,stateless", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_STATELESS &&

        fd->flags & DETECT_FLOW_FLAG_TOCLIENT &&

        fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse10 is a test for setting the from_server,stateless flow opts (order of state,dir reversed)

 */

static int DetectFlowTestParse10 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "from_server,stateless", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_STATELESS &&

        fd->flags & DETECT_FLOW_FLAG_TOCLIENT &&

        fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse11 is a test for setting the from_server,stateless flow opts with spaces all around

 */

static int DetectFlowTestParse11 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, " from_server , stateless ", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_STATELESS &&

        fd->flags & DETECT_FLOW_FLAG_TOCLIENT &&

        fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase01 is a test to make sure that we return "something"

 *  when given valid flow opt

 */

static int DetectFlowTestParseNocase01 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "ESTABLISHED", &parsed_flags);

    FAIL_IF_NULL(fd);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase02 is a test for setting the established flow opt

 */

static int DetectFlowTestParseNocase02 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "ESTABLISHED", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_ESTABLISHED &&

        fd->match_cnt == 1);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase03 is a test for setting the stateless flow opt

 */

static int DetectFlowTestParseNocase03 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "STATELESS", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_STATELESS && fd->match_cnt == 1);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase04 is a test for setting the to_client flow opt

 */

static int DetectFlowTestParseNocase04 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "TO_CLIENT", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_TOCLIENT && fd->match_cnt == 1);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase05 is a test for setting the to_server flow opt

 */

static int DetectFlowTestParseNocase05 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "TO_SERVER", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_TOSERVER && fd->match_cnt == 1);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase06 is a test for setting the from_server flow opt

 */

static int DetectFlowTestParseNocase06 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "FROM_SERVER", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_TOCLIENT && fd->match_cnt == 1);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase07 is a test for setting the from_client flow opt

 */

static int DetectFlowTestParseNocase07 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "FROM_CLIENT", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags == DETECT_FLOW_FLAG_TOSERVER && fd->match_cnt == 1);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase08 is a test for setting the established,to_client flow opts

 */

static int DetectFlowTestParseNocase08 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "ESTABLISHED,TO_CLIENT", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_ESTABLISHED &&

        fd->flags & DETECT_FLOW_FLAG_TOCLIENT &&

        fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase09 is a test for setting the to_client,stateless flow opts (order of state,dir reversed)

 */

static int DetectFlowTestParseNocase09 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "TO_CLIENT,STATELESS", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_STATELESS &&

        fd->flags & DETECT_FLOW_FLAG_TOCLIENT &&

        fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase10 is a test for setting the from_server,stateless flow opts (order of state,dir reversed)

 */

static int DetectFlowTestParseNocase10 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "FROM_SERVER,STATELESS", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_STATELESS &&

        fd->flags & DETECT_FLOW_FLAG_TOCLIENT &&

        fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase11 is a test for setting the from_server,stateless flow opts with spaces all around

 */

static int DetectFlowTestParseNocase11 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, " FROM_SERVER , STATELESS ", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_STATELESS &&

        fd->flags & DETECT_FLOW_FLAG_TOCLIENT &&

        fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse12 is a test for setting an invalid separator :

 */

static int DetectFlowTestParse12 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "from_server:stateless", &parsed_flags);

    FAIL_IF_NOT_NULL(fd);

    PASS;

}

/**

 * \test DetectFlowTestParse13 is a test for an invalid option

 */

static int DetectFlowTestParse13 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "invalidoptiontest", &parsed_flags);

    FAIL_IF_NOT_NULL(fd);

    PASS;

}

/**

 * \test DetectFlowTestParse14 is a test for a empty option

 */

static int DetectFlowTestParse14 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "", &parsed_flags);

    FAIL_IF_NOT_NULL(fd);

    PASS;

}

/**

 * \test DetectFlowTestParse15 is a test for an invalid combo of options established,stateless

 */

static int DetectFlowTestParse15 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "established,stateless", &parsed_flags);

    FAIL_IF_NOT_NULL(fd);

    PASS;

}

/**

 * \test DetectFlowTestParse16 is a test for an invalid combo of options to_client,to_server

 */

static int DetectFlowTestParse16 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "to_client,to_server", &parsed_flags);

    FAIL_IF_NOT_NULL(fd);

    PASS;

}

/**

 * \test DetectFlowTestParse16 is a test for an invalid combo of options to_client,from_server

 * flowbit flags are the same

 */

static int DetectFlowTestParse17 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "to_client,from_server", &parsed_flags);

    FAIL_IF_NOT_NULL(fd);

    PASS;

}

/**

 * \test DetectFlowTestParse18 is a test for setting the from_server,stateless,only_stream flow opts (order of state,dir reversed)

 */

static int DetectFlowTestParse18 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd =

            DetectFlowParse(NULL, "from_server,established,only_stream", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_ESTABLISHED && fd->flags & DETECT_FLOW_FLAG_TOCLIENT);

    FAIL_IF_NOT(parsed_flags == DETECT_FLOW_FLAG_ONLYSTREAM);

    FAIL_IF_NOT(fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParseNocase18 is a test for setting the from_server,stateless,only_stream flow opts (order of state,dir reversed)

 */

static int DetectFlowTestParseNocase18 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd =

            DetectFlowParse(NULL, "FROM_SERVER,ESTABLISHED,ONLY_STREAM", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_ESTABLISHED && fd->flags & DETECT_FLOW_FLAG_TOCLIENT);

    FAIL_IF_NOT(parsed_flags == DETECT_FLOW_FLAG_ONLYSTREAM);

    FAIL_IF_NOT(fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse19 is a test for one to many options passed to DetectFlowParse

 */

static int DetectFlowTestParse19 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd =

            DetectFlowParse(NULL, "from_server,established,only_stream,a", &parsed_flags);

    FAIL_IF_NOT_NULL(fd);

    PASS;

}

/**

 * \test DetectFlowTestParse20 is a test for setting from_server, established, no_stream

 */

static int DetectFlowTestParse20 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "from_server,established,no_stream", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_ESTABLISHED && fd->flags & DETECT_FLOW_FLAG_TOCLIENT);

    FAIL_IF_NOT(parsed_flags == DETECT_FLOW_FLAG_NOSTREAM);

    FAIL_IF_NOT(fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse20 is a test for setting from_server, established, no_stream

 */

static int DetectFlowTestParseNocase20 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "FROM_SERVER,ESTABLISHED,NO_STREAM", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_ESTABLISHED && fd->flags & DETECT_FLOW_FLAG_TOCLIENT);

    FAIL_IF_NOT(parsed_flags == DETECT_FLOW_FLAG_NOSTREAM);

    FAIL_IF_NOT(fd->match_cnt == 2);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test DetectFlowTestParse21 is a test for an invalid opt between to valid opts

 */

static int DetectFlowTestParse21 (void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "from_server,a,no_stream", &parsed_flags);

    FAIL_IF_NOT_NULL(fd);

    PASS;

}

/**

 * \test DetectFlowTestParse22 is a test for setting the established,not_established flow opts both

 */

static int DetectFlowTestParse22(void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "established,not_established", &parsed_flags);

    FAIL_IF_NOT_NULL(fd);

    fd = DetectFlowParse(NULL, "not_established,established", &parsed_flags);

    FAIL_IF_NOT_NULL(fd);

    PASS;

}

static int DetectFlowSigTest01(void)

{

    uint8_t *buf = (uint8_t *)"supernovaduper";

    uint16_t buflen = strlen((char *)buf);

    ThreadVars th_v;

    DecodeThreadVars dtv;

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

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

    Packet *p = UTHBuildPacket(buf, buflen, IPPROTO_TCP);

    FAIL_IF_NULL(p);

    const char *sig1 = "alert tcp any any -> any any (msg:\"dummy\"; "

        "content:\"nova\"; flow:no_stream; sid:1;)";

    DetectEngineCtx *de_ctx = DetectEngineCtxInit();

    FAIL_IF_NULL(de_ctx);

    de_ctx->flags |= DE_QUIET;

    de_ctx->sig_list = SigInit(de_ctx, sig1);

    FAIL_IF_NULL(de_ctx->sig_list);

    SigGroupBuild(de_ctx);

    DetectEngineThreadCtx *det_ctx = NULL;

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

    FAIL_IF_NULL(det_ctx);

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

    FAIL_IF(PacketAlertCheck(p, 1) != 1);

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

    DetectEngineCtxFree(de_ctx);

    UTHFreePacket(p);

    PASS;

}

/**

 * \test Test parsing of the not_established keyword.

 */

static int DetectFlowTestParseNotEstablished(void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "not_established", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_NOT_ESTABLISHED);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test Test parsing of the "no_frag" flow argument.

 */

static int DetectFlowTestParseNoFrag(void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "no_frag", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_NO_FRAG);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test Test parsing of the "only_frag" flow argument.

 */

static int DetectFlowTestParseOnlyFrag(void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "only_frag", &parsed_flags);

    FAIL_IF_NULL(fd);

    FAIL_IF_NOT(fd->flags & DETECT_FLOW_FLAG_ONLY_FRAG);

    DetectFlowFree(NULL, fd);

    PASS;

}

/**

 * \test Test that parsing of only_frag and no_frag together fails.

 */

static int DetectFlowTestParseNoFragOnlyFrag(void)

{

    uint16_t parsed_flags = 0;

    DetectFlowData *fd = DetectFlowParse(NULL, "no_frag,only_frag", &parsed_flags);

    FAIL_IF_NOT_NULL(fd);