detect-engine-build.c

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/* Copyright (C) 2007-2025 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.
 */
 
#include "suricata-common.h"
#include "detect.h"
#include "detect-engine.h"
#include "detect-parse.h"
#include "detect-content.h"
 
#include "detect-engine-build.h"
#include "detect-engine-address.h"
#include "detect-engine-analyzer.h"
#include "detect-engine-iponly.h"
#include "detect-engine-mpm.h"
#include "detect-engine-siggroup.h"
#include "detect-engine-port.h"
#include "detect-engine-prefilter.h"
#include "detect-engine-proto.h"
#include "detect-engine-threshold.h"
 
#include "detect-dsize.h"
#include "detect-tcp-flags.h"
#include "detect-flow.h"
#include "detect-config.h"
#include "detect-flowbits.h"
 
#include "app-layer-events.h"
 
#include "util-port-interval-tree.h"
#include "util-profiling.h"
#include "util-validate.h"
#include "util-var-name.h"
#include "util-conf.h"
 
/* Magic numbers to make the rules of a certain order fall in the same group */
#define DETECT_PGSCORE_RULE_PORT_PRIORITIZED 111 /* Rule port group contains a priority port */
#define DETECT_PGSCORE_RULE_MPM_FAST_PATTERN 99  /* Rule contains an MPM fast pattern */
#define DETECT_PGSCORE_RULE_MPM_NEGATED      77  /* Rule contains a negated MPM */
#define DETECT_PGSCORE_RULE_NO_MPM           55  /* Rule does not contain MPM */
#define DETECT_PGSCORE_RULE_SYN_ONLY         33  /* Rule needs SYN check */
 
void SigCleanSignatures(DetectEngineCtx *de_ctx)
{
    if (de_ctx == NULL)
        return;
 
    for (Signature *s = de_ctx->sig_list; s != NULL;) {
        Signature *ns = s->next;
        SigFree(de_ctx, s);
        s = ns;
    }
    de_ctx->sig_list = NULL;
 
    DetectEngineResetMaxSigId(de_ctx);
    de_ctx->sig_list = NULL;
}
 
/** \brief Find a specific signature by sid and gid
 *  \param de_ctx detection engine ctx
 *  \param sid the signature id
 *  \param gid the signature group id
 *
 *  \retval s sig found
 *  \retval NULL sig not found
 */
Signature *SigFindSignatureBySidGid(DetectEngineCtx *de_ctx, uint32_t sid, uint32_t gid)
{
    if (de_ctx == NULL)
        return NULL;
 
    for (Signature *s = de_ctx->sig_list; s != NULL; s = s->next) {
        if (s->id == sid && s->gid == gid)
            return s;
    }
 
    return NULL;
}
 
/**
 *  \brief Check if a signature contains the filestore keyword.
 *
 *  \param s signature
 *
 *  \retval 0 no
 *  \retval 1 yes
 */
int SignatureIsFilestoring(const Signature *s)
{
    if (s == NULL)
        return 0;
 
    if (s->flags & SIG_FLAG_FILESTORE)
        return 1;
 
    return 0;
}
 
/**
 *  \brief Check if a signature contains the filemagic keyword.
 *
 *  \param s signature
 *
 *  \retval 0 no
 *  \retval 1 yes
 */
int SignatureIsFilemagicInspecting(const Signature *s)
{
    if (s == NULL)
        return 0;
 
    if (s->file_flags & FILE_SIG_NEED_MAGIC)
        return 1;
 
    return 0;
}
 
/**
 *  \brief Check if a signature contains the filemd5 keyword.
 *
 *  \param s signature
 *
 *  \retval 0 no
 *  \retval 1 yes
 */
int SignatureIsFileMd5Inspecting(const Signature *s)
{
    if ((s != NULL) && (s->file_flags & FILE_SIG_NEED_MD5))
        return 1;
 
    return 0;
}
 
/**
 *  \brief Check if a signature contains the filesha1 keyword.
 *
 *  \param s signature
 *
 *  \retval 0 no
 *  \retval 1 yes
 */
int SignatureIsFileSha1Inspecting(const Signature *s)
{
    if ((s != NULL) && (s->file_flags & FILE_SIG_NEED_SHA1))
        return 1;
 
    return 0;
}
 
/**
 *  \brief Check if a signature contains the filesha256 keyword.
 *
 *  \param s signature
 *
 *  \retval 0 no
 *  \retval 1 yes
 */
int SignatureIsFileSha256Inspecting(const Signature *s)
{
    if ((s != NULL) && (s->file_flags & FILE_SIG_NEED_SHA256))
        return 1;
 
    return 0;
}
 
static bool SignatureInspectsBuffers(const Signature *s)
{
    return (s->init_data->buffer_index > 0);
}
 
/** \brief Test is a initialized signature is IP only
 *  \param de_ctx detection engine ctx
 *  \param s the signature
 *  \retval 1 sig is ip only
 *  \retval 2 sig is like ip only
 *  \retval 0 sig is not ip only
 */
int SignatureIsIPOnly(DetectEngineCtx *de_ctx, const Signature *s)
{
    /* explicit hook means no IP-only */
    if (s->init_data->hook.type != SIGNATURE_HOOK_TYPE_NOT_SET)
        return 0;
 
    if (s->alproto != ALPROTO_UNKNOWN)
        return 0;
 
    if (s->init_data->smlists[DETECT_SM_LIST_PMATCH] != NULL)
        return 0;
 
    // may happen for 'config' keyword, postmatch
    if (s->flags & SIG_FLAG_APPLAYER)
        return 0;
 
    /* if flow dir is set we can't process it in ip-only */
    if (!(((s->flags & (SIG_FLAG_TOSERVER|SIG_FLAG_TOCLIENT)) == 0) ||
            (s->flags & (SIG_FLAG_TOSERVER|SIG_FLAG_TOCLIENT)) ==
            (SIG_FLAG_TOSERVER|SIG_FLAG_TOCLIENT)))
        return 0;
 
    /* for now assume that all registered buffer types are incompatible */
    if (SignatureInspectsBuffers(s)) {
        SCReturnInt(0);
    }
 
    /* TMATCH list can be ignored, it contains TAGs and
     * tags are compatible to IP-only. */
 
    SigMatch *sm = s->init_data->smlists[DETECT_SM_LIST_MATCH];
    for (; sm != NULL; sm = sm->next) {
        if (!(sigmatch_table[sm->type].flags & SIGMATCH_IPONLY_COMPAT))
            return 0;
        /* we have enabled flowbits to be compatible with ip only sigs, as long
         * as the sig only has a "set" flowbits */
        if (sm->type == DETECT_FLOWBITS &&
                (((DetectFlowbitsData *)sm->ctx)->cmd != DETECT_FLOWBITS_CMD_SET)) {
            return 0;
        }
    }
    sm = s->init_data->smlists[DETECT_SM_LIST_POSTMATCH];
    for ( ; sm != NULL; sm = sm->next) {
        if ( !(sigmatch_table[sm->type].flags & SIGMATCH_IPONLY_COMPAT))
            return 0;
        /* we have enabled flowbits to be compatible with ip only sigs, as long
         * as the sig only has a "set" flowbits */
        if (sm->type == DETECT_FLOWBITS &&
            (((DetectFlowbitsData *)sm->ctx)->cmd != DETECT_FLOWBITS_CMD_SET) ) {
            return 0;
        }
    }
 
    if (s->init_data->src_contains_negation || s->init_data->dst_contains_negation) {
        /* Rule is IP only, but contains negated addresses. */
        return 2;
    }
    if (!(de_ctx->flags & DE_QUIET)) {
        SCLogDebug("IP-ONLY (%" PRIu32 "): source %s, dest %s", s->id,
                   s->flags & SIG_FLAG_SRC_ANY ? "ANY" : "SET",
                   s->flags & SIG_FLAG_DST_ANY ? "ANY" : "SET");
    }
    return 1;
}
 
/** \internal
 *  \brief Test is a initialized signature is inspecting protocol detection only
 *  \param de_ctx detection engine ctx
 *  \param s the signature
 *  \retval 1 sig is dp only
 *  \retval 0 sig is not dp only
 */
static int SignatureIsPDOnly(const DetectEngineCtx *de_ctx, const Signature *s)
{
    /* explicit hook means no PD-only */
    if (s->init_data->hook.type != SIGNATURE_HOOK_TYPE_NOT_SET)
        return 0;
 
    if (s->alproto != ALPROTO_UNKNOWN)
        return 0;
 
    if (s->init_data->smlists[DETECT_SM_LIST_PMATCH] != NULL)
        return 0;
 
    /* for now assume that all registered buffer types are incompatible */
    if (SignatureInspectsBuffers(s)) {
        SCReturnInt(0);
    }
 
    /* TMATCH list can be ignored, it contains TAGs and
     * tags are compatible to DP-only. */
 
    /* match list matches may be compatible to DP only. We follow the same
     * logic as IP-only so we can use that flag */
 
    SigMatch *sm = s->init_data->smlists[DETECT_SM_LIST_MATCH];
    if (sm == NULL)
        return 0;
 
    int pd = 0;
    for ( ; sm != NULL; sm = sm->next) {
        if (sm->type == DETECT_APP_LAYER_PROTOCOL) {
            pd = 1;
        } else {
            /* flowbits are supported for dp only sigs, as long
             * as the sig only has a "set" flowbits */
            if (sm->type == DETECT_FLOWBITS) {
                if ((((DetectFlowbitsData *)sm->ctx)->cmd != DETECT_FLOWBITS_CMD_SET) ) {
                    SCLogDebug("%u: not PD-only: flowbit settings other than 'set'", s->id);
                    return 0;
                }
            } else if (sm->type == DETECT_FLOW) {
                if (((DetectFlowData *)sm->ctx)->flags & ~(DETECT_FLOW_FLAG_TOSERVER|DETECT_FLOW_FLAG_TOCLIENT)) {
                    SCLogDebug("%u: not PD-only: flow settings other than toserver/toclient", s->id);
                    return 0;
                }
            } else if ( !(sigmatch_table[sm->type].flags & SIGMATCH_IPONLY_COMPAT)) {
                SCLogDebug("%u: not PD-only: %s not PD/IP-only compat", s->id, sigmatch_table[sm->type].name);
                return 0;
            }
        }
    }
 
    if (pd) {
        SCLogDebug("PD-ONLY (%" PRIu32 ")", s->id);
    }
    return pd;
}
 
/**
 *  \internal
 *  \brief Check if the initialized signature is inspecting the packet payload
 *  \param de_ctx detection engine ctx
 *  \param s the signature
 *  \retval 1 sig is inspecting the payload
 *  \retval 0 sig is not inspecting the payload
 */
static int SignatureIsInspectingPayload(DetectEngineCtx *de_ctx, const Signature *s)
{
 
    if (s->init_data->smlists[DETECT_SM_LIST_PMATCH] != NULL) {
        return 1;
    }
    return 0;
}
 
/**
 *  \internal
 *  \brief check if a signature is decoder event matching only
 *  \param de_ctx detection engine
 *  \param s the signature to test
 *  \retval 0 not a DEOnly sig
 *  \retval 1 DEOnly sig
 */
static int SignatureIsDEOnly(DetectEngineCtx *de_ctx, const Signature *s)
{
    /* explicit hook means no DE-only */
    if (s->init_data->hook.type != SIGNATURE_HOOK_TYPE_NOT_SET)
        SCReturnInt(0);
 
    if (s->alproto != ALPROTO_UNKNOWN) {
        SCReturnInt(0);
    }
 
    if (s->init_data->smlists[DETECT_SM_LIST_PMATCH] != NULL)
    {
        SCReturnInt(0);
    }
 
    /* for now assume that all registered buffer types are incompatible */
    if (SignatureInspectsBuffers(s)) {
        SCReturnInt(0);
    }
 
    /* check for conflicting keywords */
    SigMatch *sm = s->init_data->smlists[DETECT_SM_LIST_MATCH];
    for ( ;sm != NULL; sm = sm->next) {
        if ( !(sigmatch_table[sm->type].flags & SIGMATCH_DEONLY_COMPAT))
            SCReturnInt(0);
    }
 
    /* need at least one decode event keyword to be considered decode event. */
    sm = s->init_data->smlists[DETECT_SM_LIST_MATCH];
    for ( ;sm != NULL; sm = sm->next) {
        if (sm->type == DETECT_DECODE_EVENT)
            goto deonly;
        if (sm->type == DETECT_ENGINE_EVENT)
            goto deonly;
        if (sm->type == DETECT_STREAM_EVENT)
            goto deonly;
    }
 
    SCReturnInt(0);
 
deonly:
    if (!(de_ctx->flags & DE_QUIET)) {
        SCLogDebug("DE-ONLY (%" PRIu32 "): source %s, dest %s", s->id,
                   s->flags & SIG_FLAG_SRC_ANY ? "ANY" : "SET",
                   s->flags & SIG_FLAG_DST_ANY ? "ANY" : "SET");
    }
 
    SCReturnInt(1);
}
 
#define MASK_TCP_INITDEINIT_FLAGS   (TH_SYN|TH_RST|TH_FIN)
#define MASK_TCP_UNUSUAL_FLAGS      (TH_URG|TH_ECN|TH_CWR)
 
/* Create mask for this packet + it's flow if it has one
 */
void
PacketCreateMask(Packet *p, SignatureMask *mask, AppProto alproto,
        bool app_decoder_events)
{
    if (!(PKT_IS_PSEUDOPKT(p))) {
        (*mask) |= SIG_MASK_REQUIRE_REAL_PKT;
    }
    if (!(p->flags & PKT_NOPAYLOAD_INSPECTION) && p->payload_len > 0) {
        SCLogDebug("packet has payload");
        (*mask) |= SIG_MASK_REQUIRE_PAYLOAD;
    } else if (p->flags & PKT_DETECT_HAS_STREAMDATA) {
        SCLogDebug("stream data available");
        (*mask) |= SIG_MASK_REQUIRE_PAYLOAD;
    } else {
        SCLogDebug("packet has no payload");
        (*mask) |= SIG_MASK_REQUIRE_NO_PAYLOAD;
    }
 
    if (p->events.cnt > 0 || app_decoder_events != 0 ||
            (p->app_layer_events != NULL && p->app_layer_events->cnt)) {
        SCLogDebug("packet/flow has events set");
        (*mask) |= SIG_MASK_REQUIRE_ENGINE_EVENT;
    }
 
    if (!(PKT_IS_PSEUDOPKT(p)) && PacketIsTCP(p)) {
        const TCPHdr *tcph = PacketGetTCP(p);
        if ((tcph->th_flags & MASK_TCP_INITDEINIT_FLAGS) != 0) {
            (*mask) |= SIG_MASK_REQUIRE_FLAGS_INITDEINIT;
        }
        if ((tcph->th_flags & MASK_TCP_UNUSUAL_FLAGS) != 0) {
            (*mask) |= SIG_MASK_REQUIRE_FLAGS_UNUSUAL;
        }
    }
 
    if (p->flags & PKT_HAS_FLOW) {
        SCLogDebug("packet has flow");
        (*mask) |= SIG_MASK_REQUIRE_FLOW;
    }
}
 
static int SignatureCreateMask(Signature *s)
{
    SCEnter();
 
    if ((s->flags & (SIG_FLAG_REQUIRE_PACKET | SIG_FLAG_REQUIRE_STREAM)) ==
            SIG_FLAG_REQUIRE_PACKET) {
        s->mask |= SIG_MASK_REQUIRE_REAL_PKT;
    }
    if (s->init_data->smlists[DETECT_SM_LIST_PMATCH] != NULL) {
        s->mask |= SIG_MASK_REQUIRE_PAYLOAD;
        SCLogDebug("sig requires payload");
    }
 
    SigMatch *sm;
    for (sm = s->init_data->smlists[DETECT_SM_LIST_MATCH] ; sm != NULL; sm = sm->next) {
        switch(sm->type) {
            case DETECT_FLOWBITS:
            {
                /* figure out what flowbit action */
                DetectFlowbitsData *fb = (DetectFlowbitsData *)sm->ctx;
                if (fb->cmd == DETECT_FLOWBITS_CMD_ISSET) {
                    /* not a mask flag, but still set it here */
                    s->flags |= SIG_FLAG_REQUIRE_FLOWVAR;
 
                    SCLogDebug("SIG_FLAG_REQUIRE_FLOWVAR set as sig has "
                            "flowbit isset option.");
                }
 
                /* flow is required for any flowbit manipulation */
                s->mask |= SIG_MASK_REQUIRE_FLOW;
                SCLogDebug("sig requires flow to be able to manipulate "
                        "flowbit(s)");
                break;
            }
            case DETECT_FLOWINT:
                /* flow is required for any flowint manipulation */
                s->mask |= SIG_MASK_REQUIRE_FLOW;
                SCLogDebug("sig requires flow to be able to manipulate "
                        "flowint(s)");
                break;
            case DETECT_FLAGS:
            {
                DetectFlagsData *fl = (DetectFlagsData *)sm->ctx;
 
                if (fl->flags & MASK_TCP_INITDEINIT_FLAGS) {
                    s->mask |= SIG_MASK_REQUIRE_FLAGS_INITDEINIT;
                    SCLogDebug("sig requires SIG_MASK_REQUIRE_FLAGS_INITDEINIT");
                }
                if (fl->flags & MASK_TCP_UNUSUAL_FLAGS) {
                    s->mask |= SIG_MASK_REQUIRE_FLAGS_UNUSUAL;
                    SCLogDebug("sig requires SIG_MASK_REQUIRE_FLAGS_UNUSUAL");
                }
                break;
            }
            case DETECT_DSIZE:
            {
                DetectU16Data *ds = (DetectU16Data *)sm->ctx;
                /* LT will include 0, so no payload.
                 * if GT is used in the same rule the
                 * flag will be set anyway. */
                if (ds->mode == DETECT_UINT_RA || ds->mode == DETECT_UINT_GT ||
                        ds->mode == DETECT_UINT_NE || ds->mode == DETECT_UINT_GTE) {
 
                    s->mask |= SIG_MASK_REQUIRE_PAYLOAD;
                    SCLogDebug("sig requires payload");
 
                } else if (ds->mode == DETECT_UINT_EQ) {
                    if (ds->arg1 > 0) {
                        s->mask |= SIG_MASK_REQUIRE_PAYLOAD;
                        SCLogDebug("sig requires payload");
                    } else {
                        s->mask |= SIG_MASK_REQUIRE_NO_PAYLOAD;
                        SCLogDebug("sig requires no payload");
                    }
                }
                break;
            }
            case DETECT_DECODE_EVENT:
                // fallthrough
            case DETECT_STREAM_EVENT:
                // fallthrough
            case DETECT_APP_LAYER_EVENT:
                // fallthrough
            case DETECT_ENGINE_EVENT:
                s->mask |= SIG_MASK_REQUIRE_ENGINE_EVENT;
                break;
        }
    }
 
    for (sm = s->init_data->smlists[DETECT_SM_LIST_POSTMATCH]; sm != NULL; sm = sm->next) {
        switch (sm->type) {
            case DETECT_CONFIG: {
                DetectConfigData *fd = (DetectConfigData *)sm->ctx;
                if (fd->scope == CONFIG_SCOPE_FLOW) {
                    s->mask |= SIG_MASK_REQUIRE_FLOW;
                }
                break;
            }
        }
    }
 
    if (s->init_data->init_flags & SIG_FLAG_INIT_FLOW) {
        s->mask |= SIG_MASK_REQUIRE_FLOW;
        SCLogDebug("sig requires flow");
    }
 
    if (s->flags & SIG_FLAG_APPLAYER) {
        s->mask |= SIG_MASK_REQUIRE_FLOW;
        SCLogDebug("sig requires flow");
    }
 
    SCLogDebug("mask %02X", s->mask);
    SCReturnInt(0);
}
 
static void SigInitStandardMpmFactoryContexts(DetectEngineCtx *de_ctx)
{
    DetectMpmInitializeBuiltinMpms(de_ctx);
}
 
/** \brief Pure-PCRE or bytetest rule */
static bool RuleInspectsPayloadHasNoMpm(const Signature *s)
{
    if (s->init_data->mpm_sm == NULL && s->init_data->smlists[DETECT_SM_LIST_PMATCH] != NULL)
        return true;
    return false;
}
 
static int RuleGetMpmPatternSize(const Signature *s)
{
    if (s->init_data->mpm_sm == NULL)
        return -1;
    int mpm_list = s->init_data->mpm_sm_list;
    if (mpm_list < 0)
        return -1;
    const DetectContentData *cd = (const DetectContentData *)s->init_data->mpm_sm->ctx;
    if (cd == NULL)
        return -1;
    return (int)cd->content_len;
}
 
static bool RuleMpmIsNegated(const Signature *s)
{
    if (s->flags & SIG_FLAG_MPM_NEG)
        return true;
    if (s->init_data->mpm_sm == NULL)
        return false;
    int mpm_list = s->init_data->mpm_sm_list;
    if (mpm_list < 0)
        return false;
    const DetectContentData *cd = (const DetectContentData *)s->init_data->mpm_sm->ctx;
    if (cd == NULL)
        return false;
    return (cd->flags & DETECT_CONTENT_NEGATED) ? true : false;
}
 
static SCJsonBuilder *RulesGroupPrintSghStats(const DetectEngineCtx *de_ctx,
        const SigGroupHead *sgh, const int add_rules, const int add_mpm_stats)
{
    uint32_t prefilter_cnt = 0;
    uint32_t mpm_cnt = 0;
    uint32_t nonmpm_cnt = 0;
    uint32_t mpm_depth_cnt = 0;
    uint32_t mpm_endswith_cnt = 0;
    uint32_t negmpm_cnt = 0;
    uint32_t any5_cnt = 0;
    uint32_t payload_no_mpm_cnt = 0;
    uint32_t syn_cnt = 0;
 
    uint32_t mpms_min = 0;
    uint32_t mpms_max = 0;
 
    int max_buffer_type_id = de_ctx->buffer_type_id;
 
    struct {
        uint32_t total;
        uint32_t cnt;
        uint32_t min;
        uint32_t max;
    } mpm_stats[max_buffer_type_id];
    memset(mpm_stats, 0x00, sizeof(mpm_stats));
 
    uint32_t alstats[g_alproto_max];
    memset(alstats, 0, g_alproto_max * sizeof(uint32_t));
    uint32_t mpm_sizes[max_buffer_type_id][256];
    memset(mpm_sizes, 0, sizeof(mpm_sizes));
    uint32_t alproto_mpm_bufs[g_alproto_max][max_buffer_type_id];
    memset(alproto_mpm_bufs, 0, sizeof(alproto_mpm_bufs));
 
    DEBUG_VALIDATE_BUG_ON(sgh->init == NULL);
    if (sgh->init == NULL)
        return NULL;
 
    SCJsonBuilder *js = SCJbNewObject();
    if (unlikely(js == NULL))
        return NULL;
 
    SCJbSetUint(js, "id", sgh->id);
 
    SCJbOpenArray(js, "rules");
    for (uint32_t x = 0; x < sgh->init->sig_cnt; x++) {
        const Signature *s = sgh->init->match_array[x];
        if (s == NULL)
            continue;
 
        int any = 0;
        if (s->proto.flags & DETECT_PROTO_ANY) {
            any++;
        }
        if (s->flags & SIG_FLAG_DST_ANY) {
            any++;
        }
        if (s->flags & SIG_FLAG_SRC_ANY) {
            any++;
        }
        if (s->flags & SIG_FLAG_DP_ANY) {
            any++;
        }
        if (s->flags & SIG_FLAG_SP_ANY) {
            any++;
        }
        if (any == 5) {
            any5_cnt++;
        }
 
        prefilter_cnt += (s->init_data->prefilter_sm != NULL);
        if (s->init_data->mpm_sm == NULL) {
            nonmpm_cnt++;
 
            if (s->sm_arrays[DETECT_SM_LIST_MATCH] != NULL) {
                SCLogDebug("SGH %p Non-MPM inspecting only packets. Rule %u", sgh, s->id);
            }
 
            DetectPort *sp = s->sp;
            DetectPort *dp = s->dp;
 
            if (s->flags & SIG_FLAG_TOSERVER && (dp->port == 0 && dp->port2 == 65535)) {
                SCLogDebug("SGH %p Non-MPM toserver and to 'any'. Rule %u", sgh, s->id);
            }
            if (s->flags & SIG_FLAG_TOCLIENT && (sp->port == 0 && sp->port2 == 65535)) {
                SCLogDebug("SGH %p Non-MPM toclient and to 'any'. Rule %u", sgh, s->id);
            }
 
            if (DetectFlagsSignatureNeedsSynPackets(s)) {
                syn_cnt++;
            }
 
        } else {
            int mpm_list = s->init_data->mpm_sm_list;
            BUG_ON(mpm_list < 0);
            const DetectContentData *cd = (const DetectContentData *)s->init_data->mpm_sm->ctx;
            uint32_t size = cd->content_len < 256 ? cd->content_len : 255;
 
            mpm_sizes[mpm_list][size]++;
            alproto_mpm_bufs[s->alproto][mpm_list]++;
 
            if (mpm_list == DETECT_SM_LIST_PMATCH) {
                if (size == 1) {
                    DetectPort *sp = s->sp;
                    DetectPort *dp = s->dp;
                    if (s->flags & SIG_FLAG_TOSERVER) {
                        if (dp->port == 0 && dp->port2 == 65535) {
                            SCLogDebug("SGH %p toserver 1byte fast_pattern to ANY. Rule %u", sgh, s->id);
                        } else {
                            SCLogDebug("SGH %p toserver 1byte fast_pattern to port(s) %u-%u. Rule %u", sgh, dp->port, dp->port2, s->id);
                        }
                    }
                    if (s->flags & SIG_FLAG_TOCLIENT) {
                        if (sp->port == 0 && sp->port2 == 65535) {
                            SCLogDebug("SGH %p toclient 1byte fast_pattern to ANY. Rule %u", sgh, s->id);
                        } else {
                            SCLogDebug("SGH %p toclient 1byte fast_pattern to port(s) %u-%u. Rule %u", sgh, sp->port, sp->port2, s->id);
                        }
                    }
                }
            }
 
            uint32_t w = PatternStrength(cd->content, cd->content_len);
            if (mpms_min == 0)
                mpms_min = w;
            if (w < mpms_min)
                mpms_min = w;
            if (w > mpms_max)
                mpms_max = w;
 
            BUG_ON(mpm_list >= max_buffer_type_id);
            mpm_stats[mpm_list].total += w;
            mpm_stats[mpm_list].cnt++;
            if (mpm_stats[mpm_list].min == 0 || w < mpm_stats[mpm_list].min)
                mpm_stats[mpm_list].min = w;
            if (w > mpm_stats[mpm_list].max)
                mpm_stats[mpm_list].max = w;
 
            mpm_cnt++;
 
            if (w < 10) {
                SCLogDebug("SGH %p Weak MPM Pattern on %s. Rule %u", sgh, DetectListToString(mpm_list), s->id);
            }
            if (w < 10 && any == 5) {
                SCLogDebug("SGH %p Weak MPM Pattern on %s, rule is 5xAny. Rule %u", sgh, DetectListToString(mpm_list), s->id);
            }
 
            if (cd->flags & DETECT_CONTENT_NEGATED) {
                SCLogDebug("SGH %p MPM Pattern on %s, is negated. Rule %u", sgh, DetectListToString(mpm_list), s->id);
                negmpm_cnt++;
            }
            if (cd->flags & DETECT_CONTENT_ENDS_WITH) {
                mpm_endswith_cnt++;
            }
            if (cd->flags & DETECT_CONTENT_DEPTH) {
                mpm_depth_cnt++;
            }
        }
 
        if (RuleInspectsPayloadHasNoMpm(s)) {
            SCLogDebug("SGH %p No MPM. Payload inspecting. Rule %u", sgh, s->id);
            payload_no_mpm_cnt++;
        }
 
        alstats[s->alproto]++;
 
        if (add_rules) {
            SCJsonBuilder *e = SCJbNewObject();
            if (e != NULL) {
                SCJbSetUint(e, "sig_id", s->id);
                SCJbClose(e);
                SCJbAppendObject(js, e);
                SCJbFree(e);
            }
        }
    }
    SCJbClose(js);
 
    SCJbOpenObject(js, "stats");
    SCJbSetUint(js, "total", sgh->init->sig_cnt);
 
    SCJbOpenObject(js, "types");
    SCJbSetUint(js, "mpm", mpm_cnt);
    SCJbSetUint(js, "non_mpm", nonmpm_cnt);
    SCJbSetUint(js, "mpm_depth", mpm_depth_cnt);
    SCJbSetUint(js, "mpm_endswith", mpm_endswith_cnt);
    SCJbSetUint(js, "negated_mpm", negmpm_cnt);
    SCJbSetUint(js, "payload_but_no_mpm", payload_no_mpm_cnt);
    SCJbSetUint(js, "prefilter", prefilter_cnt);
    SCJbSetUint(js, "syn", syn_cnt);
    SCJbSetUint(js, "any5", any5_cnt);
    SCJbClose(js);
 
    for (AppProto i = 0; i < g_alproto_max; i++) {
        if (alstats[i] > 0) {
            const char *proto_name = (i == ALPROTO_UNKNOWN) ? "payload" : AppProtoToString(i);
            SCJbOpenObject(js, proto_name);
            SCJbSetUint(js, "total", alstats[i]);
 
            for (int y = 0; y < max_buffer_type_id; y++) {
                if (alproto_mpm_bufs[i][y] == 0)
                    continue;
 
                const char *name;
                if (y < DETECT_SM_LIST_DYNAMIC_START)
                    name = DetectListToHumanString(y);
                else
                    name = DetectEngineBufferTypeGetNameById(de_ctx, y);
 
                SCJbSetUint(js, name, alproto_mpm_bufs[i][y]);
            }
            SCJbClose(js);
        }
    }
 
    if (add_mpm_stats) {
        SCJbOpenObject(js, "mpm");
 
        for (int i = 0; i < max_buffer_type_id; i++) {
            if (mpm_stats[i].cnt > 0) {
                const char *name;
                if (i < DETECT_SM_LIST_DYNAMIC_START)
                    name = DetectListToHumanString(i);
                else
                    name = DetectEngineBufferTypeGetNameById(de_ctx, i);
 
                SCJbOpenArray(js, name);
 
                for (int y = 0; y < 256; y++) {
                    if (mpm_sizes[i][y] == 0)
                        continue;
 
                    SCJsonBuilder *e = SCJbNewObject();
                    if (e != NULL) {
                        SCJbSetUint(e, "size", y);
                        SCJbSetUint(e, "count", mpm_sizes[i][y]);
                        SCJbClose(e);
                        SCJbAppendObject(js, e);
                        SCJbFree(e);
                    }
                }
 
                SCJsonBuilder *e = SCJbNewObject();
                if (e != NULL) {
                    SCJbSetUint(e, "total", mpm_stats[i].cnt);
                    SCJbSetUint(e, "avg_strength", mpm_stats[i].total / mpm_stats[i].cnt);
                    SCJbSetUint(e, "min_strength", mpm_stats[i].min);
                    SCJbSetUint(e, "max_strength", mpm_stats[i].max);
                    SCJbClose(e);
                    SCJbAppendObject(js, e);
                    SCJbFree(e);
                }
 
                SCJbClose(js);
            }
        }
        SCJbClose(js);
    }
    SCJbClose(js);
 
    SCJbSetUint(js, "score", sgh->init->score);
    SCJbClose(js);
 
    return js;
}
 
static void RulesDumpGrouping(const DetectEngineCtx *de_ctx,
                       const int add_rules, const int add_mpm_stats)
{
    SCJsonBuilder *js = SCJbNewObject();
    if (unlikely(js == NULL))
        return;
 
    for (int p = 0; p < 256; p++) {
        if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
            const char *name = (p == IPPROTO_TCP) ? "tcp" : "udp";
 
            SCJbOpenObject(js, name);
            SCJbOpenArray(js, "toserver");
            const DetectPort *list =
                    (p == IPPROTO_TCP) ? de_ctx->flow_gh[1].tcp : de_ctx->flow_gh[1].udp;
            while (list != NULL) {
                SCJsonBuilder *port = SCJbNewObject();
                SCJbSetUint(port, "port", list->port);
                SCJbSetUint(port, "port2", list->port2);
 
                SCJsonBuilder *stats =
                        RulesGroupPrintSghStats(de_ctx, list->sh, add_rules, add_mpm_stats);
                SCJbSetObject(port, "rulegroup", stats);
                SCJbFree(stats);
                SCJbClose(port);
                SCJbAppendObject(js, port);
                SCJbFree(port);
 
                list = list->next;
            }
            SCJbClose(js); // toserver array
 
            SCJbOpenArray(js, "toclient");
            list = (p == IPPROTO_TCP) ? de_ctx->flow_gh[0].tcp :
                                        de_ctx->flow_gh[0].udp;
            while (list != NULL) {
                SCJsonBuilder *port = SCJbNewObject();
                SCJbSetUint(port, "port", list->port);
                SCJbSetUint(port, "port2", list->port2);
 
                SCJsonBuilder *stats =
                        RulesGroupPrintSghStats(de_ctx, list->sh, add_rules, add_mpm_stats);
                SCJbSetObject(port, "rulegroup", stats);
                SCJbFree(stats);
                SCJbClose(port);
                SCJbAppendObject(js, port);
                SCJbFree(port);
 
                list = list->next;
            }
            SCJbClose(js); // toclient array
            SCJbClose(js);
        } else if (p == IPPROTO_ICMP || p == IPPROTO_ICMPV6) {
            const char *name = (p == IPPROTO_ICMP) ? "icmpv4" : "icmpv6";
            SCJbOpenObject(js, name);
            if (de_ctx->flow_gh[1].sgh[p]) {
                SCJbOpenObject(js, "toserver");
                SCJsonBuilder *stats = RulesGroupPrintSghStats(
                        de_ctx, de_ctx->flow_gh[1].sgh[p], add_rules, add_mpm_stats);
                SCJbSetObject(js, "rulegroup", stats);
                SCJbFree(stats);
                SCJbClose(js);
            }
            if (de_ctx->flow_gh[0].sgh[p]) {
                SCJbOpenObject(js, "toclient");
                SCJsonBuilder *stats = RulesGroupPrintSghStats(
                        de_ctx, de_ctx->flow_gh[0].sgh[p], add_rules, add_mpm_stats);
                SCJbSetObject(js, "rulegroup", stats);
                SCJbFree(stats);
                SCJbClose(js);
            }
            SCJbClose(js);
        }
    }
    SCJbClose(js);
 
    const char *filename = "rule_group.json";
    const char *log_dir = SCConfigGetLogDirectory();
    char log_path[PATH_MAX] = "";
    snprintf(log_path, sizeof(log_path), "%s/%s", log_dir, filename);
 
    FILE *fp = fopen(log_path, "w");
    if (fp != NULL) {
        fwrite(SCJbPtr(js), SCJbLen(js), 1, fp);
        (void)fclose(fp);
    }
    SCJbFree(js);
}
 
static int RulesGroupByIPProto(DetectEngineCtx *de_ctx)
{
    Signature *s = de_ctx->sig_list;
 
    SigGroupHead *sgh_ts[256] = {NULL};
    SigGroupHead *sgh_tc[256] = {NULL};
 
    for ( ; s != NULL; s = s->next) {
        if (s->type == SIG_TYPE_IPONLY)
            continue;
 
        /* traverse over IP protocol list from libc */
        for (int p = 0; p < 256; p++) {
            if (p == IPPROTO_TCP || p == IPPROTO_UDP) {
                continue;
            }
            if (!(s->proto.proto[p / 8] & (1<<(p % 8)) || (s->proto.flags & DETECT_PROTO_ANY))) {
                continue;
            }
 
            /* Signatures that are ICMP, SCTP, not IP only are handled here */
            if (s->flags & SIG_FLAG_TOCLIENT) {
                SigGroupHeadAppendSig(de_ctx, &sgh_tc[p], s);
            }
            if (s->flags & SIG_FLAG_TOSERVER) {
                SigGroupHeadAppendSig(de_ctx, &sgh_ts[p], s);
            }
        }
    }
 
    /* lets look at deduplicating this list */
    SigGroupHeadHashFree(de_ctx);
    SigGroupHeadHashInit(de_ctx);
 
    uint32_t cnt = 0;
    uint32_t own = 0;
    uint32_t ref = 0;
    int p;
    for (p = 0; p < 256; p++) {
        if (p == IPPROTO_TCP || p == IPPROTO_UDP)
            continue;
        if (sgh_ts[p] == NULL)
            continue;
 
        cnt++;
 
        SigGroupHead *lookup_sgh = SigGroupHeadHashLookup(de_ctx, sgh_ts[p]);
        if (lookup_sgh == NULL) {
            SCLogDebug("proto group %d sgh %p is the original", p, sgh_ts[p]);
 
            SigGroupHeadSetSigCnt(sgh_ts[p], 0);
            SigGroupHeadBuildMatchArray(de_ctx, sgh_ts[p], 0);
 
            SigGroupHeadHashAdd(de_ctx, sgh_ts[p]);
            SigGroupHeadStore(de_ctx, sgh_ts[p]);
            own++;
        } else {
            SCLogDebug("proto group %d sgh %p is a copy", p, sgh_ts[p]);
 
            SigGroupHeadFree(de_ctx, sgh_ts[p]);
            sgh_ts[p] = lookup_sgh;
            ref++;
        }
    }
    SCLogPerf("OTHER %s: %u proto groups, %u unique SGH's, %u copies",
            "toserver", cnt, own, ref);
 
    cnt = 0;
    own = 0;
    ref = 0;
    for (p = 0; p < 256; p++) {
        if (p == IPPROTO_TCP || p == IPPROTO_UDP)
            continue;
        if (sgh_tc[p] == NULL)
            continue;
 
        cnt++;
 
        SigGroupHead *lookup_sgh = SigGroupHeadHashLookup(de_ctx, sgh_tc[p]);
        if (lookup_sgh == NULL) {
            SCLogDebug("proto group %d sgh %p is the original", p, sgh_tc[p]);
 
            SigGroupHeadSetSigCnt(sgh_tc[p], 0);
            SigGroupHeadBuildMatchArray(de_ctx, sgh_tc[p], 0);
 
            SigGroupHeadHashAdd(de_ctx, sgh_tc[p]);
            SigGroupHeadStore(de_ctx, sgh_tc[p]);
            own++;
 
        } else {
            SCLogDebug("proto group %d sgh %p is a copy", p, sgh_tc[p]);
 
            SigGroupHeadFree(de_ctx, sgh_tc[p]);
            sgh_tc[p] = lookup_sgh;
            ref++;
        }
    }
    SCLogPerf("OTHER %s: %u proto groups, %u unique SGH's, %u copies",
            "toclient", cnt, own, ref);
 
    for (p = 0; p < 256; p++) {
        if (p == IPPROTO_TCP || p == IPPROTO_UDP)
            continue;
 
        de_ctx->flow_gh[0].sgh[p] = sgh_tc[p];
        de_ctx->flow_gh[1].sgh[p] = sgh_ts[p];
    }
 
    return 0;
}
 
static int PortIsPriority(const DetectEngineCtx *de_ctx, const DetectPort *a, int ipproto)
{
    DetectPort *w = de_ctx->tcp_priorityports;
    if (ipproto == IPPROTO_UDP)
        w = de_ctx->udp_priorityports;
 
    while (w) {
        /* Make sure the priority port falls in the port range of a */
        DEBUG_VALIDATE_BUG_ON(a->port > a->port2);
        if (a->port == w->port && w->port2 == a->port2) {
            return 1;
        }
        w = w->next;
    }
 
    return 0;
}
 
static int RuleSetScore(Signature *s)
{
    DetectPort *p = NULL;
    if (s->flags & SIG_FLAG_TOSERVER)
        p = s->dp;
    else if (s->flags & SIG_FLAG_TOCLIENT)
        p = s->sp;
    else
        return 0;
 
    /* for sigs that don't use 'any' as port, see if we want to
     * prioritize poor sigs */
    int wl = 0;
    if (!(p->port == 0 && p->port2 == 65535)) {
        /* pure pcre, bytetest, etc rules */
        if (RuleInspectsPayloadHasNoMpm(s)) {
            SCLogDebug("Rule %u MPM has 1 byte fast_pattern. Prioritizing SGH's.", s->id);
            wl = DETECT_PGSCORE_RULE_MPM_FAST_PATTERN;
 
        } else if (RuleMpmIsNegated(s)) {
            SCLogDebug("Rule %u MPM is negated. Prioritizing SGH's.", s->id);
            wl = DETECT_PGSCORE_RULE_MPM_NEGATED;
 
            /* one byte pattern in packet/stream payloads */
        } else if (s->init_data->mpm_sm != NULL &&
                   s->init_data->mpm_sm_list == DETECT_SM_LIST_PMATCH &&
                   RuleGetMpmPatternSize(s) == 1) {
            SCLogDebug("Rule %u No MPM. Payload inspecting. Prioritizing SGH's.", s->id);
            wl = DETECT_PGSCORE_RULE_NO_MPM;
 
        } else if (DetectFlagsSignatureNeedsSynOnlyPackets(s)) {
            SCLogDebug("Rule %u Needs SYN, so inspected often. Prioritizing SGH's.", s->id);
            wl = DETECT_PGSCORE_RULE_SYN_ONLY;
        }
    }
 
    s->init_data->score = wl;
    return wl;
}
 
static int SortCompare(const void *a, const void *b)
{
    const DetectPort *pa = *(const DetectPort **)a;
    const DetectPort *pb = *(const DetectPort **)b;
 
    if (pa->sh->init->score < pb->sh->init->score) {
        return 1;
    } else if (pa->sh->init->score > pb->sh->init->score) {
        return -1;
    }
 
    if (pa->sh->init->sig_cnt < pb->sh->init->sig_cnt) {
        return 1;
    } else if (pa->sh->init->sig_cnt > pb->sh->init->sig_cnt) {
        return -1;
    }
 
    /* Hack to make the qsort output deterministic across platforms.
     * This had to be done because the order of equal elements sorted
     * by qsort is undeterministic and showed different output on BSD,
     * MacOS and Windows. Sorting based on id makes it deterministic. */
    if (pa->sh->id < pb->sh->id)
        return -1;
 
    return 1;
}
 
static inline void SortGroupList(
        uint32_t *groups, DetectPort **list, int (*CompareFunc)(const void *, const void *))
{
    int cnt = 0;
    for (DetectPort *x = *list; x != NULL; x = x->next) {
        DEBUG_VALIDATE_BUG_ON(x->port > x->port2);
        cnt++;
    }
    if (cnt <= 1)
        return;
 
    /* build temporary array to sort with qsort */
    DetectPort **array = (DetectPort **)SCCalloc(cnt, sizeof(DetectPort *));
    if (array == NULL)
        return;
 
    int idx = 0;
    for (DetectPort *x = *list; x != NULL;) {
        /* assign a temporary id to resolve otherwise equal groups */
        x->sh->id = idx + 1;
        SigGroupHeadSetSigCnt(x->sh, 0);
        DetectPort *next = x->next;
        x->next = x->prev = x->last = NULL;
        DEBUG_VALIDATE_BUG_ON(x->port > x->port2);
        array[idx++] = x;
        x = next;
    }
    DEBUG_VALIDATE_BUG_ON(cnt != idx);
 
    qsort(array, idx, sizeof(DetectPort *), SortCompare);
 
    /* rebuild the list based on the qsort-ed array */
    DetectPort *new_list = NULL, *tail = NULL;
    for (int i = 0; i < idx; i++) {
        DetectPort *p = array[i];
        /* unset temporary group id */
        p->sh->id = 0;
 
        if (new_list == NULL) {
            new_list = p;
        }
        if (tail != NULL) {
            tail->next = p;
        }
        p->prev = tail;
        tail = p;
    }
 
    *list = new_list;
    *groups = idx;
 
#if DEBUG
    int dbgcnt = 0;
    SCLogDebug("SORTED LIST:");
    for (DetectPort *tmp = *list; tmp != NULL; tmp = tmp->next) {
        SCLogDebug("item:= [%u:%u]; score: %d; sig_cnt: %d", tmp->port, tmp->port2,
                tmp->sh->init->score, tmp->sh->init->sig_cnt);
        dbgcnt++;
        BUG_ON(dbgcnt > cnt);
    }
#endif
    SCFree(array);
}
/** \internal
 *  \brief Create a list of DetectPort objects sorted based on CompareFunc's
 *         logic.
 *
 *  List can limit the number of groups. In this case an extra "join" group
 *  is created that contains the sigs belonging to that. It's *appended* to
 *  the list, meaning that if the list is walked linearly it's found last.
 *  The joingr is meant to be a catch all.
 *
 */
static int CreateGroupedPortList(DetectEngineCtx *de_ctx, DetectPort *port_list,
        DetectPort **newhead, uint32_t unique_groups,
        int (*CompareFunc)(const void *, const void *))
{
    DetectPort *tmplist = NULL, *joingr = NULL;
    uint32_t groups = 0;
 
    /* insert the ports into the tmplist, where it will
     * be sorted descending on 'cnt' and on whether a group
     * is prioritized. */
    tmplist = port_list;
    SortGroupList(&groups, &tmplist, SortCompare);
    uint32_t left = unique_groups;
    if (left == 0)
        left = groups;
 
    /* create another list: take the port groups from above
     * and add them to the 2nd list until we have met our
     * count. The rest is added to the 'join' group. */
    DetectPort *tmplist2 = NULL, *tmplist2_tail = NULL;
    DetectPort *gr, *next_gr;
    for (gr = tmplist; gr != NULL;) {
        next_gr = gr->next;
 
        SCLogDebug("temp list gr %p %u:%u", gr, gr->port, gr->port2);
        DetectPortPrint(gr);
 
        /* if we've set up all the unique groups, add the rest to the
         * catch-all joingr */
        if (left == 0) {
            if (joingr == NULL) {
                DetectPortParse(de_ctx, &joingr, "0:65535");
                if (joingr == NULL) {
                    goto error;
                }
                SCLogDebug("joingr => %u-%u", joingr->port, joingr->port2);
                joingr->next = NULL;
            }
            SigGroupHeadCopySigs(de_ctx, gr->sh, &joingr->sh);
 
            /* when a group's sigs are added to the joingr, we can free it */
            gr->next = NULL;
            DetectPortFree(de_ctx, gr);
            /* append */
        } else {
            gr->next = NULL;
 
            if (tmplist2 == NULL) {
                tmplist2 = gr;
                tmplist2_tail = gr;
            } else {
                tmplist2_tail->next = gr;
                tmplist2_tail = gr;
            }
        }
 
        if (left > 0)
            left--;
 
        gr = next_gr;
    }
 
    /* if present, append the joingr that covers the rest */
    if (joingr != NULL) {
        SCLogDebug("appending joingr %p %u:%u", joingr, joingr->port, joingr->port2);
 
        if (tmplist2 == NULL) {
            tmplist2 = joingr;
            // tmplist2_tail = joingr;
        } else {
            tmplist2_tail->next = joingr;
            // tmplist2_tail = joingr;
        }
    } else {
        SCLogDebug("no joingr");
    }
 
    /* pass back our new list to the caller */
    *newhead = tmplist2;
    DetectPortPrintList(*newhead);
 
    return 0;
error:
    return -1;
}
 
#define UNDEFINED_PORT 0
#define RANGE_PORT  1
#define SINGLE_PORT 2
 
typedef struct UniquePortPoint_ {
    uint16_t port; /* value of the port */
    bool single;   /* is the port single or part of a range */
} UniquePortPoint;
 
/**
 * \brief Function to set unique port points. Consider all the ports
 *        flattened out on one line, set the points that correspond
 *        to a valid port. Also store whether the port point stored
 *        was a single port or part of a range.
 *
 * \param p Port object to be set
 * \param unique_list List of unique port points to be updated
 * \param size_list Current size of the list
 *
 * \return Updated size of the list
 */
static inline uint32_t SetUniquePortPoints(
        const DetectPort *p, uint8_t *unique_list, uint32_t size_list)
{
    if (unique_list[p->port] == UNDEFINED_PORT) {
        if (p->port == p->port2) {
            unique_list[p->port] = SINGLE_PORT;
        } else {
            unique_list[p->port] = RANGE_PORT;
        }
        size_list++;
    } else if (((unique_list[p->port] == SINGLE_PORT) && (p->port != p->port2)) ||
               ((unique_list[p->port] == RANGE_PORT) && (p->port == p->port2))) {
        if ((p->port != UINT16_MAX) && (unique_list[p->port + 1] == UNDEFINED_PORT)) {
            unique_list[p->port + 1] = RANGE_PORT;
            size_list++;
        }
    }
 
    /* Treat right boundary as single point to avoid creating unneeded
     * ranges later on */
    if (unique_list[p->port2] == UNDEFINED_PORT) {
        size_list++;
    }
    unique_list[p->port2] = SINGLE_PORT;
    return size_list;
}
 
/**
 * \brief Function to set the *final* unique port points and save them
 *        for later use. The points are already sorted because of the way
 *        they have been retrieved and saved earlier for use at this point.
 *
 * \param unique_list List of the unique port points to be used
 * \param size_unique_arr Number of unique port points
 * \param final_arr List of the final unique port points to be created
 */
static inline void SetFinalUniquePortPoints(
        const uint8_t *unique_list, const uint32_t size_unique_arr, UniquePortPoint *final_arr)
{
    for (uint32_t i = 0, j = 0; i < (UINT16_MAX + 1); i++) {
        DEBUG_VALIDATE_BUG_ON(j > size_unique_arr);
        if (unique_list[i] == RANGE_PORT) {
            final_arr[j].port = (uint16_t)i;
            final_arr[j++].single = false;
        } else if (unique_list[i] == SINGLE_PORT) {
            final_arr[j].port = (uint16_t)i;
            final_arr[j++].single = true;
        }
    }
}
 
/**
 * \brief Function to create the list of ports with the smallest ranges
 *        by resolving overlaps and end point conditions. These contain the
 *        correct SGHs as well after going over the interval tree to find
 *        any range overlaps.
 *
 * \param de_ctx Detection Engine Context
 * \param unique_list Final list of unique port points
 * \param size_list Size of the unique_list
 * \param it Pointer to the interval tree
 * \param list Pointer to the list where final ports will be stored
 *
 * \return 0 on success, -1 otherwise
 */
static inline int CreatePortList(DetectEngineCtx *de_ctx, const uint8_t *unique_list,
        const uint32_t size_list, SCPortIntervalTree *it, DetectPort **list)
{
    /* Only do the operations if there is at least one unique port */
    if (size_list == 0)
        return 0;
    UniquePortPoint *final_unique_points =
            (UniquePortPoint *)SCCalloc(size_list, sizeof(UniquePortPoint));
    if (final_unique_points == NULL)
        return -1;
    SetFinalUniquePortPoints(unique_list, size_list, final_unique_points);
    /* Handle edge case when there is just one unique port */
    if (size_list == 1) {
        SCPortIntervalFindOverlappingRanges(
                de_ctx, final_unique_points[0].port, final_unique_points[0].port, &it->tree, list);
    } else {
        UniquePortPoint *p1 = &final_unique_points[0];
        UniquePortPoint *p2 = &final_unique_points[1];
        uint16_t port = p1 ? p1->port : 0; // just for cppcheck
        uint16_t port2 = p2->port;
        for (uint32_t i = 1; i < size_list; i++) {
            DEBUG_VALIDATE_BUG_ON(port > port2);
            if ((p1 && p1->single) && p2->single) {
                SCPortIntervalFindOverlappingRanges(de_ctx, port, port, &it->tree, list);
                SCPortIntervalFindOverlappingRanges(de_ctx, port2, port2, &it->tree, list);
                port = port2 + 1;
            } else if (p1 && p1->single) {
                SCPortIntervalFindOverlappingRanges(de_ctx, port, port, &it->tree, list);
                if ((port2 > port + 1)) {
                    SCPortIntervalFindOverlappingRanges(
                            de_ctx, port + 1, port2 - 1, &it->tree, list);
                    port = port2;
                } else {
                    port = port + 1;
                }
            } else if (p2->single) {
                /* If port2 is boundary and less or equal to port + 1, create a range
                 * keeping the boundary away as it is single port */
                if ((port2 >= port + 1)) {
                    SCPortIntervalFindOverlappingRanges(de_ctx, port, port2 - 1, &it->tree, list);
                }
                /* Deal with port2 as it is a single port */
                SCPortIntervalFindOverlappingRanges(de_ctx, port2, port2, &it->tree, list);
                port = port2 + 1;
            } else {
                if ((port2 > port + 1)) {
                    SCPortIntervalFindOverlappingRanges(de_ctx, port, port2 - 1, &it->tree, list);
                    port = port2;
                } else {
                    SCPortIntervalFindOverlappingRanges(de_ctx, port, port2, &it->tree, list);
                    port = port2 + 1;
                }
            }
            /* if the current port matches the p2->port, assign it to p1 so that
             * there is a UniquePortPoint object to check other info like whether
             * the port with this value is single */
            if (port == p2->port) {
                p1 = p2;
            } else {
                p1 = NULL;
            }
            if (i + 1 < size_list) {
                p2 = &final_unique_points[i + 1];
                port2 = p2->port;
            }
        }
    }
    /* final_unique_points array is no longer needed */
    SCFree(final_unique_points);
    return 0;
}
 
static DetectPort *RulesGroupByPorts(DetectEngineCtx *de_ctx, uint8_t ipproto, uint32_t direction)
{
    /* step 1: create a hash of 'DetectPort' objects based on all the
     *         rules. Each object will have a SGH with the sigs added
     *         that belong to the SGH. */
    DetectPortHashInit(de_ctx);
 
    uint32_t size_unique_port_arr = 0;
    const Signature *s = de_ctx->sig_list;
    DetectPort *list = NULL;
 
    uint8_t *unique_port_points = (uint8_t *)SCCalloc(UINT16_MAX + 1, sizeof(uint8_t));
    if (unique_port_points == NULL)
        return NULL;
 
    while (s) {
        /* IP Only rules are handled separately */
        if (s->type == SIG_TYPE_IPONLY)
            goto next;
        /* Protocol does not match the Signature protocol and is neither IP or pkthdr */
        if (!(s->proto.proto[ipproto / 8] & (1<<(ipproto % 8)) || (s->proto.flags & DETECT_PROTO_ANY)))
            goto next;
        /* Direction does not match Signature direction */
        if (direction == SIG_FLAG_TOSERVER) {
            if (!(s->flags & SIG_FLAG_TOSERVER))
                goto next;
        } else if (direction == SIG_FLAG_TOCLIENT) {
            if (!(s->flags & SIG_FLAG_TOCLIENT))
                goto next;
        }
 
        /* see if we want to exclude directionless sigs that really care only for
         * to_server syn scans/floods */
        if ((direction == SIG_FLAG_TOCLIENT) && DetectFlagsSignatureNeedsSynOnlyPackets(s) &&
                ((s->flags & (SIG_FLAG_TOSERVER | SIG_FLAG_TOCLIENT)) ==
                        (SIG_FLAG_TOSERVER | SIG_FLAG_TOCLIENT)) &&
                (!(s->dp->port == 0 && s->dp->port2 == 65535))) {
            SCLogWarning("rule %u: SYN-only to port(s) %u:%u "
                         "w/o direction specified, disabling for toclient direction",
                    s->id, s->dp->port, s->dp->port2);
            goto next;
        }
 
        DetectPort *p = NULL;
        if (direction == SIG_FLAG_TOSERVER)
            p = s->dp;
        else if (direction == SIG_FLAG_TOCLIENT)
            p = s->sp;
        else
            BUG_ON(1);
 
        int wl = s->init_data->score;
        while (p) {
            int pwl = PortIsPriority(de_ctx, p, ipproto) ? DETECT_PGSCORE_RULE_PORT_PRIORITIZED : 0;
            pwl = MAX(wl,pwl);
 
            DetectPort *lookup = DetectPortHashLookup(de_ctx, p);
            if (lookup) {
                SigGroupHeadAppendSig(de_ctx, &lookup->sh, s);
                lookup->sh->init->score = MAX(lookup->sh->init->score, pwl);
            } else {
                DetectPort *tmp2 = DetectPortCopySingle(de_ctx, p);
                BUG_ON(tmp2 == NULL);
                SigGroupHeadAppendSig(de_ctx, &tmp2->sh, s);
                tmp2->sh->init->score = pwl;
                DetectPortHashAdd(de_ctx, tmp2);
                size_unique_port_arr =
                        SetUniquePortPoints(tmp2, unique_port_points, size_unique_port_arr);
            }
 
            p = p->next;
        }
    next:
        s = s->next;
    }
 
    /* step 2: create a list of the smallest port ranges with
     * appropriate SGHs */
 
    /* Create an interval tree of all the given ports to make the search
     * for overlaps later on easier */
    SCPortIntervalTree *it = SCPortIntervalTreeInit();
    if (it == NULL)
        goto error;
 
    HashListTableBucket *htb = NULL;
    for (htb = HashListTableGetListHead(de_ctx->dport_hash_table); htb != NULL;
            htb = HashListTableGetListNext(htb)) {
        DetectPort *p = HashListTableGetListData(htb);
        if (SCPortIntervalInsert(de_ctx, it, p) != SC_OK) {
            SCLogDebug("Port was not inserted in the tree");
            goto error;
        }
    }
 
    /* Create a sorted list of ports in ascending order after resolving overlaps
     * and corresponding SGHs */
    if (CreatePortList(de_ctx, unique_port_points, size_unique_port_arr, it, &list) < 0)
        goto error;
 
    /* unique_port_points array is no longer needed */
    SCFree(unique_port_points);
 
    /* Port hashes are no longer needed */
    DetectPortHashFree(de_ctx);
 
    SCLogDebug("rules analyzed");
 
    /* step 3: group the list and shrink it if necessary */
    DetectPort *newlist = NULL;
    uint16_t groupmax = (direction == SIG_FLAG_TOCLIENT) ? de_ctx->max_uniq_toclient_groups :
                                                           de_ctx->max_uniq_toserver_groups;
    CreateGroupedPortList(de_ctx, list, &newlist, groupmax, SortCompare);
    list = newlist;
 
    /* step 4: deduplicate the SGH's */
    SigGroupHeadHashFree(de_ctx);
    SigGroupHeadHashInit(de_ctx);
 
    uint32_t cnt = 0;
    uint32_t own = 0;
    uint32_t ref = 0;
    DetectPort *iter;
    for (iter = list ; iter != NULL; iter = iter->next) {
        BUG_ON (iter->sh == NULL);
        DEBUG_VALIDATE_BUG_ON(own + ref != cnt);
        cnt++;
 
        SigGroupHead *lookup_sgh = SigGroupHeadHashLookup(de_ctx, iter->sh);
        if (lookup_sgh == NULL) {
            SCLogDebug("port group %p sgh %p is the original", iter, iter->sh);
 
            SigGroupHeadSetSigCnt(iter->sh, 0);
            SigGroupHeadBuildMatchArray(de_ctx, iter->sh, 0);
            SigGroupHeadSetProtoAndDirection(iter->sh, ipproto, direction);
            SigGroupHeadHashAdd(de_ctx, iter->sh);
            SigGroupHeadStore(de_ctx, iter->sh);
            iter->flags |= PORT_SIGGROUPHEAD_COPY;
            own++;
        } else {
            SCLogDebug("port group %p sgh %p is a copy", iter, iter->sh);
 
            SigGroupHeadFree(de_ctx, iter->sh);
            iter->sh = lookup_sgh;
            iter->flags |= PORT_SIGGROUPHEAD_COPY;
            ref++;
        }
    }
#if 0
    for (iter = list ; iter != NULL; iter = iter->next) {
        SCLogInfo("PORT %u-%u %p (sgh=%s, prioritized=%s/%d)",
                iter->port, iter->port2, iter->sh,
                iter->flags & PORT_SIGGROUPHEAD_COPY ? "ref" : "own",
                iter->sh->init->score ? "true" : "false",
                iter->sh->init->score);
    }
#endif
    SCLogPerf("%s %s: %u port groups, %u unique SGH's, %u copies",
            ipproto == 6 ? "TCP" : "UDP",
            direction == SIG_FLAG_TOSERVER ? "toserver" : "toclient",
            cnt, own, ref);
    SCPortIntervalTreeFree(de_ctx, it);
    return list;
 
error:
    if (unique_port_points != NULL)
        SCFree(unique_port_points);
    if (it != NULL)
        SCPortIntervalTreeFree(de_ctx, it);
 
    return NULL;
}
 
void SignatureSetType(DetectEngineCtx *de_ctx, Signature *s)
{
    BUG_ON(s->type != SIG_TYPE_NOT_SET);
    int iponly = 0;
 
    if (s->init_data->hook.type == SIGNATURE_HOOK_TYPE_APP) {
        s->type = SIG_TYPE_APP_TX;
        SCLogDebug("%u: set to app_tx due to hook type app", s->id);
        SCReturn;
    }
 
    /* see if the sig is dp only */
    if (SignatureIsPDOnly(de_ctx, s) == 1) {
        s->type = SIG_TYPE_PDONLY;
 
        /* see if the sig is ip only */
    } else if ((iponly = SignatureIsIPOnly(de_ctx, s)) > 0) {
        if (iponly == 1) {
            s->type = SIG_TYPE_IPONLY;
        } else if (iponly == 2) {
            s->type = SIG_TYPE_LIKE_IPONLY;
        }
    } else if (SignatureIsDEOnly(de_ctx, s) == 1) {
        s->type = SIG_TYPE_DEONLY;
 
    } else {
        const bool has_match = s->init_data->smlists[DETECT_SM_LIST_MATCH] != NULL;
        const bool has_pmatch = s->init_data->smlists[DETECT_SM_LIST_PMATCH] != NULL;
        bool has_buffer_frame_engine = false;
        bool has_buffer_packet_engine = false;
        bool has_buffer_app_engine = false;
 
        for (uint32_t x = 0; x < s->init_data->buffer_index; x++) {
            const uint32_t id = s->init_data->buffers[x].id;
 
            if (DetectEngineBufferTypeSupportsPacketGetById(de_ctx, id)) {
                has_buffer_packet_engine = true;
            } else if (DetectEngineBufferTypeSupportsFramesGetById(de_ctx, id)) {
                has_buffer_frame_engine = true;
            } else {
                has_buffer_app_engine = true;
            }
        }
 
        if (has_buffer_packet_engine) {
            s->type = SIG_TYPE_PKT;
        } else if (has_buffer_frame_engine || has_buffer_app_engine) {
            s->type = SIG_TYPE_APP_TX;
        } else if (has_pmatch) {
            if ((s->flags & (SIG_FLAG_REQUIRE_PACKET | SIG_FLAG_REQUIRE_STREAM)) ==
                    SIG_FLAG_REQUIRE_PACKET) {
                s->type = SIG_TYPE_PKT;
            } else if ((s->flags & (SIG_FLAG_REQUIRE_PACKET | SIG_FLAG_REQUIRE_STREAM)) ==
                       SIG_FLAG_REQUIRE_STREAM) {
                s->type = SIG_TYPE_STREAM;
            } else {
                s->type = SIG_TYPE_PKT_STREAM;
            }
        } else if (has_match) {
            s->type = SIG_TYPE_PKT;
 
            /* app-layer but no inspect engines */
        } else if (s->flags & SIG_FLAG_APPLAYER) {
            s->type = SIG_TYPE_APPLAYER;
        } else {
            s->type = SIG_TYPE_PKT;
        }
    }
}
 
/**
 * \brief Preprocess signature, classify ip-only, etc, build sig array
 *
 * \param de_ctx Pointer to the Detection Engine Context
 *
 * \retval  0 on success
 * \retval -1 on failure
 */
int SigPrepareStage1(DetectEngineCtx *de_ctx)
{
    uint32_t cnt_iponly = 0;
    uint32_t cnt_payload = 0;
    uint32_t cnt_applayer = 0;
    uint32_t cnt_deonly = 0;
 
    if (!(de_ctx->flags & DE_QUIET)) {
        SCLogDebug("building signature grouping structure, stage 1: "
                   "preprocessing rules...");
    }
 
    de_ctx->sig_array_len = DetectEngineGetMaxSigId(de_ctx);
    de_ctx->sig_array = (Signature **)SCCalloc(de_ctx->sig_array_len, sizeof(Signature *));
    if (de_ctx->sig_array == NULL)
        goto error;
 
    /* now for every rule add the source group */
    for (Signature *s = de_ctx->sig_list; s != NULL; s = s->next) {
        de_ctx->sig_array[s->iid] = s;
 
        SCLogDebug("Signature %" PRIu32 ", internal id %" PRIu32 ", ptrs %p %p ", s->id, s->iid, s,
                de_ctx->sig_array[s->iid]);
 
        if (s->type == SIG_TYPE_PDONLY) {
            SCLogDebug("Signature %"PRIu32" is considered \"PD only\"", s->id);
        } else if (s->type == SIG_TYPE_IPONLY) {
            SCLogDebug("Signature %"PRIu32" is considered \"IP only\"", s->id);
            cnt_iponly++;
        } else if (SignatureIsInspectingPayload(de_ctx, s) == 1) {
            SCLogDebug("Signature %"PRIu32" is considered \"Payload inspecting\"", s->id);
            cnt_payload++;
        } else if (s->type == SIG_TYPE_DEONLY) {
            SCLogDebug("Signature %"PRIu32" is considered \"Decoder Event only\"", s->id);
            cnt_deonly++;
        } else if (s->flags & SIG_FLAG_APPLAYER) {
            SCLogDebug("Signature %"PRIu32" is considered \"Applayer inspecting\"", s->id);
            cnt_applayer++;
        }
 
#ifdef DEBUG
        if (SCLogDebugEnabled()) {
            uint16_t colen = 0;
            char copresent = 0;
            SigMatch *sm;
            DetectContentData *co;
            for (sm = s->init_data->smlists[DETECT_SM_LIST_MATCH]; sm != NULL; sm = sm->next) {
                if (sm->type != DETECT_CONTENT)
                    continue;
 
                copresent = 1;
                co = (DetectContentData *)sm->ctx;
                if (co->content_len > colen)
                    colen = co->content_len;
            }
 
            if (copresent && colen == 1) {
                SCLogDebug("signature %8u content maxlen 1", s->id);
                for (int proto = 0; proto < 256; proto++) {
                    if (s->proto.proto[(proto/8)] & (1<<(proto%8)))
                        SCLogDebug("=> proto %" PRId32 "", proto);
                }
            }
        }
#endif /* DEBUG */
 
        if (RuleMpmIsNegated(s)) {
            s->flags |= SIG_FLAG_MPM_NEG;
        }
 
        SignatureCreateMask(s);
        DetectContentPropagateLimits(s);
        SigParseApplyDsizeToContent(s);
 
        RuleSetScore(s);
 
        /* run buffer type callbacks if any */
        for (int x = 0; x < DETECT_SM_LIST_MAX; x++) {
            if (s->init_data->smlists[x])
                DetectEngineBufferRunSetupCallback(de_ctx, x, s);
        }
        for (uint32_t x = 0; x < s->init_data->buffer_index; x++) {
            DetectEngineBufferRunSetupCallback(de_ctx, s->init_data->buffers[x].id, s);
        }
 
        de_ctx->sig_cnt++;
    }
 
    if (!(de_ctx->flags & DE_QUIET)) {
        if (strlen(de_ctx->config_prefix) > 0)
            SCLogInfo("tenant id %d: %" PRIu32 " signatures processed. %" PRIu32 " are IP-only "
                      "rules, %" PRIu32 " are inspecting packet payload, %" PRIu32
                      " inspect application layer, %" PRIu32 " are decoder event only",
                    de_ctx->tenant_id, de_ctx->sig_cnt, cnt_iponly, cnt_payload, cnt_applayer,
                    cnt_deonly);
        else
            SCLogInfo("%" PRIu32 " signatures processed. %" PRIu32 " are IP-only "
                      "rules, %" PRIu32 " are inspecting packet payload, %" PRIu32
                      " inspect application layer, %" PRIu32 " are decoder event only",
                    de_ctx->sig_cnt, cnt_iponly, cnt_payload, cnt_applayer, cnt_deonly);
 
        SCLogConfig("building signature grouping structure, stage 1: "
               "preprocessing rules... complete");
    }
 
    if (DetectFlowbitsAnalyze(de_ctx) != 0)
        goto error;
 
    return 0;
 
error:
    return -1;
}
 
/**
 *  \internal
 *  \brief add a decoder event signature to the detection engine ctx
 */
static void DetectEngineAddDecoderEventSig(DetectEngineCtx *de_ctx, Signature *s)
{
    SCLogDebug("adding signature %"PRIu32" to the decoder event sgh", s->id);
    SigGroupHeadAppendSig(de_ctx, &de_ctx->decoder_event_sgh, s);
}
 
static void DetectEngineAddSigToPreStreamHook(DetectEngineCtx *de_ctx, Signature *s)
{
    SCLogDebug("adding signature %" PRIu32 " to the pre_stream hook sgh", s->id);
 
    if ((s->flags & (SIG_FLAG_TOSERVER | SIG_FLAG_TOCLIENT)) ==
            (SIG_FLAG_TOSERVER | SIG_FLAG_TOCLIENT)) {
        SigGroupHeadAppendSig(de_ctx, &de_ctx->pre_stream_sgh[0], s);
        SigGroupHeadAppendSig(de_ctx, &de_ctx->pre_stream_sgh[1], s);
    } else if (s->flags & SIG_FLAG_TOSERVER) {
        SigGroupHeadAppendSig(de_ctx, &de_ctx->pre_stream_sgh[0], s);
    } else if (s->flags & SIG_FLAG_TOCLIENT) {
        SigGroupHeadAppendSig(de_ctx, &de_ctx->pre_stream_sgh[1], s);
    }
}
 
static void DetectEngineAddSigToPreFlowHook(DetectEngineCtx *de_ctx, Signature *s)
{
    SCLogDebug("adding signature %" PRIu32 " to the pre_flow hook sgh", s->id);
    SigGroupHeadAppendSig(de_ctx, &de_ctx->pre_flow_sgh, s);
}
 
/**
 * \brief Fill the global src group head, with the sigs included
 *
 * \param de_ctx Pointer to the Detection Engine Context whose Signatures have
 *               to be processed
 *
 * \retval  0 On success
 * \retval -1 On failure
 */
int SigPrepareStage2(DetectEngineCtx *de_ctx)
{
    SCLogDebug("building signature grouping structure, stage 2: "
            "building source address lists...");
 
    IPOnlyInit(de_ctx, &de_ctx->io_ctx);
 
    de_ctx->flow_gh[1].tcp = RulesGroupByPorts(de_ctx, IPPROTO_TCP, SIG_FLAG_TOSERVER);
    de_ctx->flow_gh[0].tcp = RulesGroupByPorts(de_ctx, IPPROTO_TCP, SIG_FLAG_TOCLIENT);
    de_ctx->flow_gh[1].udp = RulesGroupByPorts(de_ctx, IPPROTO_UDP, SIG_FLAG_TOSERVER);
    de_ctx->flow_gh[0].udp = RulesGroupByPorts(de_ctx, IPPROTO_UDP, SIG_FLAG_TOCLIENT);
 
    /* Setup the other IP Protocols (so not TCP/UDP) */
    RulesGroupByIPProto(de_ctx);
 
    /* now for every rule add the source group to our temp lists */
    for (Signature *s = de_ctx->sig_list; s != NULL; s = s->next) {
        SCLogDebug("s->id %"PRIu32, s->id);
        if (s->type == SIG_TYPE_IPONLY) {
            IPOnlyAddSignature(de_ctx, &de_ctx->io_ctx, s);
        } else if (s->type == SIG_TYPE_DEONLY) {
            DetectEngineAddDecoderEventSig(de_ctx, s);
        } else if (s->type == SIG_TYPE_PKT && s->init_data->hook.type == SIGNATURE_HOOK_TYPE_PKT &&
                   s->init_data->hook.t.pkt.ph == SIGNATURE_HOOK_PKT_PRE_STREAM) {
            DetectEngineAddSigToPreStreamHook(de_ctx, s);
        } else if (s->type == SIG_TYPE_PKT && s->init_data->hook.type == SIGNATURE_HOOK_TYPE_PKT &&
                   s->init_data->hook.t.pkt.ph == SIGNATURE_HOOK_PKT_PRE_FLOW) {
            DetectEngineAddSigToPreFlowHook(de_ctx, s);
        }
    }
 
    IPOnlyPrepare(de_ctx);
    IPOnlyPrint(de_ctx, &de_ctx->io_ctx);
    return 0;
}
 
static void DetectEngineBuildDecoderEventSgh(DetectEngineCtx *de_ctx)
{
    if (de_ctx->decoder_event_sgh == NULL)
        return;
 
    uint32_t max_idx = DetectEngineGetMaxSigId(de_ctx);
    SigGroupHeadSetSigCnt(de_ctx->decoder_event_sgh, max_idx);
    SigGroupHeadBuildMatchArray(de_ctx, de_ctx->decoder_event_sgh, max_idx);
}
 
static void DetectEngineBuildPreStreamHookSghs(DetectEngineCtx *de_ctx)
{
    uint32_t max_idx = DetectEngineGetMaxSigId(de_ctx);
    if (de_ctx->pre_stream_sgh[0] != NULL) {
        SigGroupHeadSetSigCnt(de_ctx->pre_stream_sgh[0], max_idx);
        SigGroupHeadBuildMatchArray(de_ctx, de_ctx->pre_stream_sgh[0], max_idx);
        PrefilterSetupRuleGroup(de_ctx, de_ctx->pre_stream_sgh[0]);
    }
    if (de_ctx->pre_stream_sgh[1] != NULL) {
        SigGroupHeadSetSigCnt(de_ctx->pre_stream_sgh[1], max_idx);
        SigGroupHeadBuildMatchArray(de_ctx, de_ctx->pre_stream_sgh[1], max_idx);
        PrefilterSetupRuleGroup(de_ctx, de_ctx->pre_stream_sgh[1]);
    }
 
    if (de_ctx->pre_stream_sgh[0] != NULL || de_ctx->pre_stream_sgh[1] != NULL) {
        de_ctx->PreStreamHook = DetectPreStream;
    }
}
 
static void DetectEngineBuildPreFlowHookSghs(DetectEngineCtx *de_ctx)
{
    if (de_ctx->pre_flow_sgh != NULL) {
        uint32_t max_idx = DetectEngineGetMaxSigId(de_ctx);
        SigGroupHeadSetSigCnt(de_ctx->pre_flow_sgh, max_idx);
        SigGroupHeadBuildMatchArray(de_ctx, de_ctx->pre_flow_sgh, max_idx);
        PrefilterSetupRuleGroup(de_ctx, de_ctx->pre_flow_sgh);
        de_ctx->PreFlowHook = DetectPreFlow;
    }
}
 
int SigPrepareStage3(DetectEngineCtx *de_ctx)
{
    /* prepare the decoder event sgh */
    DetectEngineBuildDecoderEventSgh(de_ctx);
 
    /* pre_flow hook sgh */
    DetectEngineBuildPreFlowHookSghs(de_ctx);
 
    /* pre_stream hook sghs */
    DetectEngineBuildPreStreamHookSghs(de_ctx);
 
    return 0;
}
 
int SigAddressCleanupStage1(DetectEngineCtx *de_ctx)
{
    BUG_ON(de_ctx == NULL);
 
    SCLogDebug("cleaning up signature grouping structure...");
 
    if (de_ctx->decoder_event_sgh)
        SigGroupHeadFree(de_ctx, de_ctx->decoder_event_sgh);
    de_ctx->decoder_event_sgh = NULL;
    if (de_ctx->pre_flow_sgh)
        SigGroupHeadFree(de_ctx, de_ctx->pre_flow_sgh);
    de_ctx->pre_flow_sgh = NULL;
    if (de_ctx->pre_stream_sgh[0])
        SigGroupHeadFree(de_ctx, de_ctx->pre_stream_sgh[0]);
    de_ctx->pre_stream_sgh[0] = NULL;
    if (de_ctx->pre_stream_sgh[1])
        SigGroupHeadFree(de_ctx, de_ctx->pre_stream_sgh[1]);
    de_ctx->pre_stream_sgh[1] = NULL;
 
    for (int f = 0; f < FLOW_STATES; f++) {
        for (int p = 0; p < 256; p++) {
            de_ctx->flow_gh[f].sgh[p] = NULL;
        }
 
        /* free lookup lists */
        DetectPortCleanupList(de_ctx, de_ctx->flow_gh[f].tcp);
        de_ctx->flow_gh[f].tcp = NULL;
        DetectPortCleanupList(de_ctx, de_ctx->flow_gh[f].udp);
        de_ctx->flow_gh[f].udp = NULL;
    }
 
    for (uint32_t idx = 0; idx < de_ctx->sgh_array_cnt; idx++) {
        SigGroupHead *sgh = de_ctx->sgh_array[idx];
        if (sgh == NULL)
            continue;
 
        SCLogDebug("sgh %p", sgh);
        SigGroupHeadFree(de_ctx, sgh);
    }
    SCFree(de_ctx->sgh_array);
    de_ctx->sgh_array = NULL;
    de_ctx->sgh_array_cnt = 0;
    de_ctx->sgh_array_size = 0;
 
    IPOnlyDeinit(de_ctx, &de_ctx->io_ctx);
 
    SCLogDebug("cleaning up signature grouping structure... complete");
    return 0;
}
 
#if 0
static void DbgPrintSigs(DetectEngineCtx *de_ctx, SigGroupHead *sgh)
{
    if (sgh == NULL) {
        printf("\n");
        return;
    }
 
    uint32_t sig;
    for (sig = 0; sig < sgh->sig_cnt; sig++) {
        printf("%" PRIu32 " ", sgh->match_array[sig]->id);
    }
    printf("\n");
}
 
static void DbgPrintSigs2(DetectEngineCtx *de_ctx, SigGroupHead *sgh)
{
    if (sgh == NULL || sgh->init == NULL) {
        printf("\n");
        return;
    }
 
    uint32_t sig;
    for (sig = 0; sig < DetectEngineGetMaxSigId(de_ctx); sig++) {
        if (sgh->init->sig_array[(sig/8)] & (1<<(sig%8))) {
            printf("%" PRIu32 " ", de_ctx->sig_array[sig]->id);
        }
    }
    printf("\n");
}
#endif
 
/** \brief finalize preparing sgh's */
int SigPrepareStage4(DetectEngineCtx *de_ctx)
{
    SCEnter();
 
    //SCLogInfo("sgh's %"PRIu32, de_ctx->sgh_array_cnt);
 
    uint32_t cnt = 0;
    for (uint32_t idx = 0; idx < de_ctx->sgh_array_cnt; idx++) {
        SigGroupHead *sgh = de_ctx->sgh_array[idx];
        if (sgh == NULL)
            continue;
 
        SCLogDebug("sgh %p", sgh);
 
        SigGroupHeadSetupFiles(de_ctx, sgh);
        SCLogDebug("filestore count %u", sgh->filestore_cnt);
 
        PrefilterSetupRuleGroup(de_ctx, sgh);
 
        sgh->id = idx;
        cnt++;
    }
    SCLogPerf("Unique rule groups: %u", cnt);
 
    MpmStoreReportStats(de_ctx);
 
    if (de_ctx->decoder_event_sgh != NULL) {
        /* no need to set filestore count here as that would make a
         * signature not decode event only. */
        PrefilterSetupRuleGroup(de_ctx, de_ctx->decoder_event_sgh);
    }
 
    int dump_grouping = 0;
    (void)SCConfGetBool("detect.profiling.grouping.dump-to-disk", &dump_grouping);
 
    if (dump_grouping) {
        int add_rules = 0;
        (void)SCConfGetBool("detect.profiling.grouping.include-rules", &add_rules);
        int add_mpm_stats = 0;
        (void)SCConfGetBool("detect.profiling.grouping.include-mpm-stats", &add_mpm_stats);
 
        RulesDumpGrouping(de_ctx, add_rules, add_mpm_stats);
    }
 
    for (uint32_t idx = 0; idx < de_ctx->sgh_array_cnt; idx++) {
        SigGroupHead *sgh = de_ctx->sgh_array[idx];
        if (sgh == NULL)
            continue;
        SigGroupHeadInitDataFree(sgh->init);
        sgh->init = NULL;
    }
    /* cleanup the hashes now since we won't need them
     * after the initialization phase. */
    SigGroupHeadHashFree(de_ctx);
 
#ifdef PROFILING
    SCProfilingSghInitCounters(de_ctx);
#endif
    SCReturnInt(0);
}
 
extern bool rule_engine_analysis_set;
/** \internal
 *  \brief perform final per signature setup tasks
 *
 *  - Create SigMatchData arrays from the init only SigMatch lists
 *  - Setup per signature inspect engines
 *  - remove signature init data.
 */
static int SigMatchPrepare(DetectEngineCtx *de_ctx)
{
    SCEnter();
 
    Signature *s = de_ctx->sig_list;
    for (; s != NULL; s = s->next) {
        /* set up inspect engines */
        DetectEngineAppInspectionEngine2Signature(de_ctx, s);
 
        /* built-ins */
        for (int type = 0; type < DETECT_SM_LIST_MAX; type++) {
            /* skip PMATCH if it is used in a stream 'app engine' instead */
            if (type == DETECT_SM_LIST_PMATCH && (s->init_data->init_flags & SIG_FLAG_INIT_STATE_MATCH))
                continue;
            SigMatch *sm = s->init_data->smlists[type];
            s->sm_arrays[type] = SigMatchList2DataArray(sm);
        }
        /* set up the pkt inspection engines */
        DetectEnginePktInspectionSetup(s);
 
        if (rule_engine_analysis_set) {
            EngineAnalysisAddAllRulePatterns(de_ctx, s);
            EngineAnalysisRules2(de_ctx, s);
        }
        /* free lists. Ctx' are xferred to sm_arrays so won't get freed */
        for (uint32_t i = 0; i < DETECT_SM_LIST_MAX; i++) {
            SigMatch *sm = s->init_data->smlists[i];
            while (sm != NULL) {
                SigMatch *nsm = sm->next;
                SigMatchFree(de_ctx, sm);
                sm = nsm;
            }
        }
        for (uint32_t i = 0; i < (uint32_t)s->init_data->transforms.cnt; i++) {
            if (s->init_data->transforms.transforms[i].options) {
                int transform = s->init_data->transforms.transforms[i].transform;
                sigmatch_table[transform].Free(
                        de_ctx, s->init_data->transforms.transforms[i].options);
                s->init_data->transforms.transforms[i].options = NULL;
            }
        }
        for (uint32_t x = 0; x < s->init_data->buffer_index; x++) {
            SigMatch *sm = s->init_data->buffers[x].head;
            while (sm != NULL) {
                SigMatch *nsm = sm->next;
                SigMatchFree(de_ctx, sm);
                sm = nsm;
            }
        }
        if (s->init_data->cidr_dst != NULL)
            IPOnlyCIDRListFree(s->init_data->cidr_dst);
 
        if (s->init_data->cidr_src != NULL)
            IPOnlyCIDRListFree(s->init_data->cidr_src);
 
        SCFree(s->init_data->buffers);
        SCFree(s->init_data->rule_state_dependant_sids_array);
        SCFree(s->init_data->rule_state_flowbits_ids_array);
        SCFree(s->init_data);
        s->init_data = NULL;
    }
 
    DumpPatterns(de_ctx);
    SCReturnInt(0);
}
 
/**
 * \brief Convert the signature list into the runtime match structure.
 *
 * \param de_ctx Pointer to the Detection Engine Context whose Signatures have
 *               to be processed
 *
 * \retval  0 On Success.
 * \retval -1 On failure.
 */
int SigGroupBuild(DetectEngineCtx *de_ctx)
{
    Signature *s = de_ctx->sig_list;
 
    /* Assign the unique order id of signatures after sorting,
     * so the IP Only engine process them in order too.  Also
     * reset the old signums and assign new signums.  We would
     * have experienced Sig reordering by now, hence the new
     * signums. */
    de_ctx->signum = 0;
    while (s != NULL) {
        s->iid = de_ctx->signum++;
 
        s = s->next;
    }
 
    if (DetectSetFastPatternAndItsId(de_ctx) < 0)
        return -1;
 
    SigInitStandardMpmFactoryContexts(de_ctx);
 
    if (SigPrepareStage1(de_ctx) != 0) {
        FatalError("initializing the detection engine failed");
    }
 
    if (SigPrepareStage2(de_ctx) != 0) {
        FatalError("initializing the detection engine failed");
    }
 
    if (SigPrepareStage3(de_ctx) != 0) {
        FatalError("initializing the detection engine failed");
    }
    if (SigPrepareStage4(de_ctx) != 0) {
        FatalError("initializing the detection engine failed");
    }
 
    int r = DetectMpmPrepareBuiltinMpms(de_ctx);
    r |= DetectMpmPrepareAppMpms(de_ctx);
    r |= DetectMpmPreparePktMpms(de_ctx);
    r |= DetectMpmPrepareFrameMpms(de_ctx);
    if (r != 0) {
        FatalError("initializing the detection engine failed");
    }
 
    if (SigMatchPrepare(de_ctx) != 0) {
        FatalError("initializing the detection engine failed");
    }
 
#ifdef PROFILING
    SCProfilingKeywordInitCounters(de_ctx);
    SCProfilingPrefilterInitCounters(de_ctx);
    de_ctx->profile_match_logging_threshold = UINT_MAX; // disabled
 
    intmax_t v = 0;
    if (SCConfGetInt("detect.profiling.inspect-logging-threshold", &v) == 1)
        de_ctx->profile_match_logging_threshold = (uint32_t)v;
#endif
#ifdef PROFILE_RULES
    SCProfilingRuleInitCounters(de_ctx);
#endif
 
    if (!DetectEngineMultiTenantEnabled()) {
        VarNameStoreActivate();
    }
 
    if (EngineModeIsFirewall()) {
        FirewallAnalyzer(de_ctx);
    }
    return 0;
}
 
int SigGroupCleanup (DetectEngineCtx *de_ctx)
{
    SigAddressCleanupStage1(de_ctx);
 
    return 0;
}