/* Copyright (C) 2007-2014 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 * \author Anoop Saldanha * * Multi pattern matcher */ #include "suricata.h" #include "suricata-common.h" #include "app-layer-protos.h" #include "decode.h" #include "detect.h" #include "detect-engine.h" #include "detect-engine-siggroup.h" #include "detect-engine-mpm.h" #include "detect-engine-iponly.h" #include "detect-parse.h" #include "util-mpm.h" #include "util-memcmp.h" #include "util-memcpy.h" #include "conf.h" #include "detect-fast-pattern.h" #include "flow.h" #include "flow-var.h" #include "detect-flow.h" #include "detect-content.h" #include "detect-uricontent.h" #include "stream.h" #include "util-enum.h" #include "util-debug.h" #include "util-print.h" #include "util-memcmp.h" #ifdef __SC_CUDA_SUPPORT__ #include "util-mpm-ac.h" #endif #include "util-validate.h" const char *builtin_mpms[] = { "toserver TCP packet", "toclient TCP packet", "toserver TCP stream", "toclient TCP stream", "toserver UDP packet", "toclient UDP packet", "other IP packet", NULL }; typedef struct AppLayerMpms_ { const char *name; int32_t sgh_mpm_context; /**< mpm factory id */ int direction; /**< SIG_FLAG_TOSERVER or SIG_FLAG_TOCLIENT */ int sm_list; uint32_t flags; /**< flags set to SGH when this mpm is present */ int id; /**< index into this array and result arrays */ } AppLayerMpms; AppLayerMpms app_mpms[] = { { "http_uri", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_UMATCH, SIG_GROUP_HEAD_MPM_URI, 0 }, { "http_raw_uri", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_HRUDMATCH, SIG_GROUP_HEAD_MPM_HRUD, 1 }, { "http_header", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_HHDMATCH, SIG_GROUP_HEAD_MPM_HHD, 2}, { "http_header", 0, SIG_FLAG_TOCLIENT, DETECT_SM_LIST_HHDMATCH, SIG_GROUP_HEAD_MPM_HHD, 3}, { "http_user_agent", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_HUADMATCH, SIG_GROUP_HEAD_MPM_HUAD, 4}, { "http_raw_header", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_HRHDMATCH, SIG_GROUP_HEAD_MPM_HRHD, 5}, { "http_raw_header", 0, SIG_FLAG_TOCLIENT, DETECT_SM_LIST_HRHDMATCH, SIG_GROUP_HEAD_MPM_HRHD, 6}, { "http_method", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_HMDMATCH, SIG_GROUP_HEAD_MPM_HMD, 7}, { "file_data", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_FILEDATA, SIG_GROUP_HEAD_MPM_FD_SMTP, 8}, /* smtp */ { "file_data", 0, SIG_FLAG_TOCLIENT, DETECT_SM_LIST_FILEDATA, SIG_GROUP_HEAD_MPM_HSBD, 9}, /* http server body */ { "http_stat_msg", 0, SIG_FLAG_TOCLIENT, DETECT_SM_LIST_HSMDMATCH, SIG_GROUP_HEAD_MPM_HSMD, 10}, { "http_stat_code", 0, SIG_FLAG_TOCLIENT, DETECT_SM_LIST_HSCDMATCH, SIG_GROUP_HEAD_MPM_HSCD, 11}, { "http_client_body", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_HCBDMATCH, SIG_GROUP_HEAD_MPM_HCBD, 12}, { "http_host", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_HHHDMATCH, SIG_GROUP_HEAD_MPM_HHHD, 13}, { "http_raw_host", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_HRHHDMATCH, SIG_GROUP_HEAD_MPM_HRHHD, 14}, { "http_cookie", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_HCDMATCH, SIG_GROUP_HEAD_MPM_HCD, 15}, { "http_cookie", 0, SIG_FLAG_TOCLIENT, DETECT_SM_LIST_HCDMATCH, SIG_GROUP_HEAD_MPM_HCD, 16}, { "dns_query", 0, SIG_FLAG_TOSERVER, DETECT_SM_LIST_DNSQUERYNAME_MATCH, SIG_GROUP_HEAD_MPM_DNSQUERY, 17}, { NULL, 0, 0, 0, 0, 0, } }; void DetectMpmInitializeAppMpms(DetectEngineCtx *de_ctx) { int i; for (i = 0; i < APP_MPMS_MAX; i++) { AppLayerMpms *am = &app_mpms[i]; am->sgh_mpm_context = MpmFactoryRegisterMpmCtxProfile(de_ctx, am->name, MPM_CTX_FACTORY_FLAGS_PREPARE_WITH_SIG_GROUP_BUILD); SCLogDebug("AppLayer MPM %s: %u", am->name, am->sgh_mpm_context); } } void DetectMpmPrepareAppMpms(DetectEngineCtx *de_ctx) { int i; for (i = 0; i < APP_MPMS_MAX; i++) { AppLayerMpms *am = &app_mpms[i]; int dir = (am->direction == SIG_FLAG_TOSERVER) ? 1 : 0; MpmCtx *mpm_ctx = MpmFactoryGetMpmCtxForProfile(de_ctx, am->sgh_mpm_context, dir); if (mpm_ctx != NULL) { if (mpm_table[de_ctx->mpm_matcher].Prepare != NULL) { mpm_table[de_ctx->mpm_matcher].Prepare(mpm_ctx); } } } } /** * \brief check if a signature has patterns that are to be inspected * against a packets payload (as opposed to the stream payload) * * \param s signature * * \retval 1 true * \retval 0 false */ int SignatureHasPacketContent(const Signature *s) { SCEnter(); if (s == NULL) { SCReturnInt(0); } if (!(s->proto.proto[IPPROTO_TCP / 8] & 1 << (IPPROTO_TCP % 8))) { SCReturnInt(1); } if (s->sm_lists[DETECT_SM_LIST_PMATCH] == NULL) { SCLogDebug("no mpm"); SCReturnInt(0); } if (!(s->flags & SIG_FLAG_REQUIRE_PACKET)) { SCReturnInt(0); } SCReturnInt(1); } /** * \brief check if a signature has patterns that are to be inspected * against the stream payload (as opposed to the individual packets * payload(s)) * * \param s signature * * \retval 1 true * \retval 0 false */ int SignatureHasStreamContent(const Signature *s) { SCEnter(); if (s == NULL) { SCReturnInt(0); } if (!(s->proto.proto[IPPROTO_TCP / 8] & 1 << (IPPROTO_TCP % 8))) { SCReturnInt(0); } if (s->sm_lists[DETECT_SM_LIST_PMATCH] == NULL) { SCLogDebug("no mpm"); SCReturnInt(0); } if (!(s->flags & SIG_FLAG_REQUIRE_STREAM)) { SCReturnInt(0); } SCReturnInt(1); } /** * \brief Function to return the multi pattern matcher algorithm to be * used by the engine, based on the mpm-algo setting in yaml * Use the default mpm if none is specified in the yaml file. * * \retval mpm algo value */ uint16_t PatternMatchDefaultMatcher(void) { char *mpm_algo; uint16_t mpm_algo_val = DEFAULT_MPM; /* Get the mpm algo defined in config file by the user */ if ((ConfGet("mpm-algo", &mpm_algo)) == 1) { uint16_t u; if (mpm_algo != NULL) { for (u = 0; u < MPM_TABLE_SIZE; u++) { if (mpm_table[u].name == NULL) continue; if (strcmp(mpm_table[u].name, mpm_algo) == 0) { mpm_algo_val = u; goto done; } } } SCLogError(SC_ERR_INVALID_YAML_CONF_ENTRY, "Invalid mpm algo supplied " "in the yaml conf file: \"%s\"", mpm_algo); exit(EXIT_FAILURE); } done: #ifdef __tile__ if (mpm_algo_val == MPM_AC) mpm_algo_val = MPM_AC_TILE; #endif return mpm_algo_val; } uint32_t PacketPatternSearchWithStreamCtx(DetectEngineThreadCtx *det_ctx, Packet *p) { SCEnter(); uint32_t ret = 0; MpmCtx *mpm_ctx = NULL; if (p->flowflags & FLOW_PKT_TOSERVER) { DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_stream_ctx_ts == NULL); mpm_ctx = det_ctx->sgh->mpm_stream_ctx_ts; } else { DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_stream_ctx_tc == NULL); mpm_ctx = det_ctx->sgh->mpm_stream_ctx_tc; } if (unlikely(mpm_ctx == NULL)) { SCReturnInt(0); } ret = mpm_table[mpm_ctx->mpm_type]. Search(mpm_ctx, &det_ctx->mtc, &det_ctx->pmq, p->payload, p->payload_len); SCReturnInt(ret); } /** \brief Pattern match -- searches for only one pattern per signature. * * \param det_ctx detection engine thread ctx * \param p packet to inspect * * \retval ret number of matches */ uint32_t PacketPatternSearch(DetectEngineThreadCtx *det_ctx, Packet *p) { SCEnter(); uint32_t ret; MpmCtx *mpm_ctx = NULL; if (p->proto == IPPROTO_TCP) { if (p->flowflags & FLOW_PKT_TOSERVER) { mpm_ctx = det_ctx->sgh->mpm_proto_tcp_ctx_ts; } else { mpm_ctx = det_ctx->sgh->mpm_proto_tcp_ctx_tc; } } else if (p->proto == IPPROTO_UDP) { if (p->flowflags & FLOW_PKT_TOSERVER) { mpm_ctx = det_ctx->sgh->mpm_proto_udp_ctx_ts; } else { mpm_ctx = det_ctx->sgh->mpm_proto_udp_ctx_tc; } } else { mpm_ctx = det_ctx->sgh->mpm_proto_other_ctx; } if (unlikely(mpm_ctx == NULL)) SCReturnInt(0); #ifdef __SC_CUDA_SUPPORT__ if (p->cuda_pkt_vars.cuda_mpm_enabled && p->pkt_src == PKT_SRC_WIRE) { ret = SCACCudaPacketResultsProcessing(p, mpm_ctx, &det_ctx->pmq); } else { ret = mpm_table[mpm_ctx->mpm_type].Search(mpm_ctx, &det_ctx->mtc, &det_ctx->pmq, p->payload, p->payload_len); } #else ret = mpm_table[mpm_ctx->mpm_type].Search(mpm_ctx, &det_ctx->mtc, &det_ctx->pmq, p->payload, p->payload_len); #endif SCReturnInt(ret); } /** \brief Uri Pattern match -- searches for one pattern per signature. * * \param det_ctx detection engine thread ctx * \param p packet to inspect * * \retval ret number of matches */ uint32_t UriPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *uri, uint16_t uri_len, uint8_t flags) { SCEnter(); uint32_t ret; DEBUG_VALIDATE_BUG_ON(flags & STREAM_TOCLIENT); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_uri_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_uri_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_uri_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, uri, uri_len); //PrintRawDataFp(stdout, uri, uri_len); SCReturnUInt(ret); } /** \brief Http client body pattern match -- searches for one pattern per * signature. * * \param det_ctx Detection engine thread ctx. * \param body The request body to inspect. * \param body_len Body length. * * \retval ret Number of matches. */ uint32_t HttpClientBodyPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *body, uint32_t body_len, uint8_t flags) { SCEnter(); uint32_t ret; DEBUG_VALIDATE_BUG_ON(flags & STREAM_TOCLIENT); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hcbd_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_hcbd_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_hcbd_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, body, body_len); SCReturnUInt(ret); } /** \brief Http server body pattern match -- searches for one pattern per * signature. * * \param det_ctx Detection engine thread ctx. * \param body The request body to inspect. * \param body_len Body length. * * \retval ret Number of matches. */ uint32_t HttpServerBodyPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *body, uint32_t body_len, uint8_t flags) { SCEnter(); uint32_t ret; DEBUG_VALIDATE_BUG_ON(!(flags & STREAM_TOCLIENT)); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hsbd_ctx_tc == NULL); ret = mpm_table[det_ctx->sgh->mpm_hsbd_ctx_tc->mpm_type]. Search(det_ctx->sgh->mpm_hsbd_ctx_tc, &det_ctx->mtcu, &det_ctx->pmq, body, body_len); SCReturnUInt(ret); } /** * \brief Http header match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param headers Headers to inspect. * \param headers_len Headers length. * * \retval ret Number of matches. */ uint32_t HttpHeaderPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *headers, uint32_t headers_len, uint8_t flags) { SCEnter(); uint32_t ret; if (flags & STREAM_TOSERVER) { DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hhd_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_hhd_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_hhd_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, headers, headers_len); } else { DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hhd_ctx_tc == NULL); ret = mpm_table[det_ctx->sgh->mpm_hhd_ctx_tc->mpm_type]. Search(det_ctx->sgh->mpm_hhd_ctx_tc, &det_ctx->mtcu, &det_ctx->pmq, headers, headers_len); } SCReturnUInt(ret); } /** * \brief Http raw header match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param headers Raw headers to inspect. * \param headers_len Raw headers length. * * \retval ret Number of matches. */ uint32_t HttpRawHeaderPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *raw_headers, uint32_t raw_headers_len, uint8_t flags) { SCEnter(); uint32_t ret; if (flags & STREAM_TOSERVER) { DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hrhd_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_hrhd_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_hrhd_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, raw_headers, raw_headers_len); } else { DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hrhd_ctx_tc == NULL); ret = mpm_table[det_ctx->sgh->mpm_hrhd_ctx_tc->mpm_type]. Search(det_ctx->sgh->mpm_hrhd_ctx_tc, &det_ctx->mtcu, &det_ctx->pmq, raw_headers, raw_headers_len); } SCReturnUInt(ret); } /** * \brief Http method match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param method Method to inspect. * \param method_len Method length. * * \retval ret Number of matches. */ uint32_t HttpMethodPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *raw_method, uint32_t raw_method_len, uint8_t flags) { SCEnter(); uint32_t ret; DEBUG_VALIDATE_BUG_ON(flags & STREAM_TOCLIENT); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hmd_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_hmd_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_hmd_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, raw_method, raw_method_len); SCReturnUInt(ret); } /** * \brief Http cookie match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param cookie Cookie to inspect. * \param cookie_len Cookie length. * * \retval ret Number of matches. */ uint32_t HttpCookiePatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *cookie, uint32_t cookie_len, uint8_t flags) { SCEnter(); uint32_t ret; if (flags & STREAM_TOSERVER) { DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hcd_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_hcd_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_hcd_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, cookie, cookie_len); } else { DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hcd_ctx_tc == NULL); ret = mpm_table[det_ctx->sgh->mpm_hcd_ctx_tc->mpm_type]. Search(det_ctx->sgh->mpm_hcd_ctx_tc, &det_ctx->mtcu, &det_ctx->pmq, cookie, cookie_len); } SCReturnUInt(ret); } /** * \brief Http raw uri match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param uri Raw uri to inspect. * \param uri_len Raw uri length. * * \retval ret Number of matches. */ uint32_t HttpRawUriPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *uri, uint32_t uri_len, uint8_t flags) { SCEnter(); uint32_t ret; DEBUG_VALIDATE_BUG_ON(flags & STREAM_TOCLIENT); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hrud_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_hrud_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_hrud_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, uri, uri_len); SCReturnUInt(ret); } /** * \brief Http stat msg match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param stat_msg Stat msg to inspect. * \param stat_msg_len Stat msg length. * * \retval ret Number of matches. */ uint32_t HttpStatMsgPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *stat_msg, uint32_t stat_msg_len, uint8_t flags) { SCEnter(); uint32_t ret; DEBUG_VALIDATE_BUG_ON(!(flags & STREAM_TOCLIENT)); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hsmd_ctx_tc == NULL); ret = mpm_table[det_ctx->sgh->mpm_hsmd_ctx_tc->mpm_type]. Search(det_ctx->sgh->mpm_hsmd_ctx_tc, &det_ctx->mtcu, &det_ctx->pmq, stat_msg, stat_msg_len); SCReturnUInt(ret); } /** * \brief Http stat code match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param stat_code Stat code to inspect. * \param stat_code_len Stat code length. * * \retval ret Number of matches. */ uint32_t HttpStatCodePatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *stat_code, uint32_t stat_code_len, uint8_t flags) { SCEnter(); uint32_t ret; DEBUG_VALIDATE_BUG_ON(!(flags & STREAM_TOCLIENT)); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hscd_ctx_tc == NULL); ret = mpm_table[det_ctx->sgh->mpm_hscd_ctx_tc->mpm_type]. Search(det_ctx->sgh->mpm_hscd_ctx_tc, &det_ctx->mtcu, &det_ctx->pmq, stat_code, stat_code_len); SCReturnUInt(ret); } /** * \brief Http user agent match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param cookie User-Agent to inspect. * \param cookie_len User-Agent buffer length. * * \retval ret Number of matches. */ uint32_t HttpUAPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *ua, uint32_t ua_len, uint8_t flags) { SCEnter(); uint32_t ret; DEBUG_VALIDATE_BUG_ON(flags & STREAM_TOCLIENT); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_huad_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_huad_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_huad_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, ua, ua_len); SCReturnUInt(ret); } /** * \brief Http host header match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param hh Host header to inspect. * \param hh_len Host header buffer length. * \param flags Flags * * \retval ret Number of matches. */ uint32_t HttpHHPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *hh, uint32_t hh_len, uint8_t flags) { SCEnter(); uint32_t ret; DEBUG_VALIDATE_BUG_ON(flags & STREAM_TOCLIENT); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hhhd_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_hhhd_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_hhhd_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, hh, hh_len); SCReturnUInt(ret); } /** * \brief Http raw host header match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param hrh Raw hostname to inspect. * \param hrh_len Raw hostname buffer length. * \param flags Flags * * \retval ret Number of matches. */ uint32_t HttpHRHPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *hrh, uint32_t hrh_len, uint8_t flags) { SCEnter(); uint32_t ret; DEBUG_VALIDATE_BUG_ON(flags & STREAM_TOCLIENT); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_hrhhd_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_hrhhd_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_hrhhd_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, hrh, hrh_len); SCReturnUInt(ret); } /** * \brief DNS query match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param hrh Buffer to inspect. * \param hrh_len buffer length. * \param flags Flags * * \retval ret Number of matches. */ uint32_t DnsQueryPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *buffer, uint32_t buffer_len, uint8_t flags) { SCEnter(); uint32_t ret = 0; DEBUG_VALIDATE_BUG_ON(flags & STREAM_TOCLIENT); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_dnsquery_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_dnsquery_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_dnsquery_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, buffer, buffer_len); SCReturnUInt(ret); } /** \brief Pattern match -- searches for only one pattern per signature. * * \param det_ctx detection engine thread ctx * \param p packet * \param smsg stream msg (reassembled stream data) * \param flags stream flags * * \retval ret number of matches */ uint32_t StreamPatternSearch(DetectEngineThreadCtx *det_ctx, Packet *p, StreamMsg *smsg, uint8_t flags) { SCEnter(); uint32_t ret = 0; uint8_t cnt = 0; //PrintRawDataFp(stdout, smsg->data.data, smsg->data.data_len); uint32_t r; if (flags & STREAM_TOSERVER) { for ( ; smsg != NULL; smsg = smsg->next) { r = mpm_table[det_ctx->sgh->mpm_stream_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_stream_ctx_ts, &det_ctx->mtcs, &det_ctx->smsg_pmq[cnt], smsg->data, smsg->data_len); if (r > 0) { ret += r; SCLogDebug("smsg match stored in det_ctx->smsg_pmq[%u]", cnt); /* merge results with overall pmq */ PmqMerge(&det_ctx->smsg_pmq[cnt], &det_ctx->pmq); } cnt++; } } else { for ( ; smsg != NULL; smsg = smsg->next) { r = mpm_table[det_ctx->sgh->mpm_stream_ctx_tc->mpm_type]. Search(det_ctx->sgh->mpm_stream_ctx_tc, &det_ctx->mtcs, &det_ctx->smsg_pmq[cnt], smsg->data, smsg->data_len); if (r > 0) { ret += r; SCLogDebug("smsg match stored in det_ctx->smsg_pmq[%u]", cnt); /* merge results with overall pmq */ PmqMerge(&det_ctx->smsg_pmq[cnt], &det_ctx->pmq); } cnt++; } } SCReturnInt(ret); } /** * \brief SMTP Filedata match -- searches for one pattern per signature. * * \param det_ctx Detection engine thread ctx. * \param buffer Buffer to inspect. * \param buffer_len buffer length. * \param flags Flags * * \retval ret Number of matches. */ uint32_t SMTPFiledataPatternSearch(DetectEngineThreadCtx *det_ctx, uint8_t *buffer, uint32_t buffer_len, uint8_t flags) { SCEnter(); uint32_t ret = 0; DEBUG_VALIDATE_BUG_ON(flags & STREAM_TOCLIENT); DEBUG_VALIDATE_BUG_ON(det_ctx->sgh->mpm_smtp_filedata_ctx_ts == NULL); ret = mpm_table[det_ctx->sgh->mpm_smtp_filedata_ctx_ts->mpm_type]. Search(det_ctx->sgh->mpm_smtp_filedata_ctx_ts, &det_ctx->mtcu, &det_ctx->pmq, buffer, buffer_len); SCReturnUInt(ret); } /** \brief cleans up the mpm instance after a match */ void PacketPatternCleanup(ThreadVars *t, DetectEngineThreadCtx *det_ctx) { PmqReset(&det_ctx->pmq); if (det_ctx->sgh == NULL) return; /* content */ if (det_ctx->sgh->mpm_proto_tcp_ctx_ts != NULL && mpm_table[det_ctx->sgh->mpm_proto_tcp_ctx_ts->mpm_type].Cleanup != NULL) { mpm_table[det_ctx->sgh->mpm_proto_tcp_ctx_ts->mpm_type].Cleanup(&det_ctx->mtc); } if (det_ctx->sgh->mpm_proto_tcp_ctx_tc != NULL && mpm_table[det_ctx->sgh->mpm_proto_tcp_ctx_tc->mpm_type].Cleanup != NULL) { mpm_table[det_ctx->sgh->mpm_proto_tcp_ctx_tc->mpm_type].Cleanup(&det_ctx->mtc); } if (det_ctx->sgh->mpm_proto_udp_ctx_ts != NULL && mpm_table[det_ctx->sgh->mpm_proto_udp_ctx_ts->mpm_type].Cleanup != NULL) { mpm_table[det_ctx->sgh->mpm_proto_udp_ctx_ts->mpm_type].Cleanup(&det_ctx->mtc); } if (det_ctx->sgh->mpm_proto_udp_ctx_tc != NULL && mpm_table[det_ctx->sgh->mpm_proto_udp_ctx_tc->mpm_type].Cleanup != NULL) { mpm_table[det_ctx->sgh->mpm_proto_udp_ctx_tc->mpm_type].Cleanup(&det_ctx->mtc); } if (det_ctx->sgh->mpm_proto_other_ctx != NULL && mpm_table[det_ctx->sgh->mpm_proto_other_ctx->mpm_type].Cleanup != NULL) { mpm_table[det_ctx->sgh->mpm_proto_other_ctx->mpm_type].Cleanup(&det_ctx->mtc); } /* uricontent */ if (det_ctx->sgh->mpm_uri_ctx_ts != NULL && mpm_table[det_ctx->sgh->mpm_uri_ctx_ts->mpm_type].Cleanup != NULL) { mpm_table[det_ctx->sgh->mpm_uri_ctx_ts->mpm_type].Cleanup(&det_ctx->mtcu); } /* stream content */ if (det_ctx->sgh->mpm_stream_ctx_ts != NULL && mpm_table[det_ctx->sgh->mpm_stream_ctx_ts->mpm_type].Cleanup != NULL) { mpm_table[det_ctx->sgh->mpm_stream_ctx_ts->mpm_type].Cleanup(&det_ctx->mtcs); } if (det_ctx->sgh->mpm_stream_ctx_tc != NULL && mpm_table[det_ctx->sgh->mpm_stream_ctx_tc->mpm_type].Cleanup != NULL) { mpm_table[det_ctx->sgh->mpm_stream_ctx_tc->mpm_type].Cleanup(&det_ctx->mtcs); } return; } void StreamPatternCleanup(ThreadVars *t, DetectEngineThreadCtx *det_ctx, StreamMsg *smsg) { uint8_t cnt = 0; while (smsg != NULL) { PmqReset(&det_ctx->smsg_pmq[cnt]); smsg = smsg->next; cnt++; } } void PatternMatchDestroy(MpmCtx *mpm_ctx, uint16_t mpm_matcher) { SCLogDebug("mpm_ctx %p, mpm_matcher %"PRIu16"", mpm_ctx, mpm_matcher); mpm_table[mpm_matcher].DestroyCtx(mpm_ctx); } void PatternMatchPrepare(MpmCtx *mpm_ctx, uint16_t mpm_matcher) { SCLogDebug("mpm_ctx %p, mpm_matcher %"PRIu16"", mpm_ctx, mpm_matcher); MpmInitCtx(mpm_ctx, mpm_matcher); } void PatternMatchThreadPrint(MpmThreadCtx *mpm_thread_ctx, uint16_t mpm_matcher) { SCLogDebug("mpm_thread_ctx %p, mpm_matcher %"PRIu16" defunct", mpm_thread_ctx, mpm_matcher); //mpm_table[mpm_matcher].PrintThreadCtx(mpm_thread_ctx); } void PatternMatchThreadDestroy(MpmThreadCtx *mpm_thread_ctx, uint16_t mpm_matcher) { SCLogDebug("mpm_thread_ctx %p, mpm_matcher %"PRIu16"", mpm_thread_ctx, mpm_matcher); if (mpm_table[mpm_matcher].DestroyThreadCtx != NULL) mpm_table[mpm_matcher].DestroyThreadCtx(NULL, mpm_thread_ctx); } void PatternMatchThreadPrepare(MpmThreadCtx *mpm_thread_ctx, uint16_t mpm_matcher) { SCLogDebug("mpm_thread_ctx %p, type %"PRIu16, mpm_thread_ctx, mpm_matcher); MpmInitThreadCtx(mpm_thread_ctx, mpm_matcher); } /* free the pattern matcher part of a SigGroupHead */ void PatternMatchDestroyGroup(SigGroupHead *sh) { /* content */ if (!(sh->flags & SIG_GROUP_HEAD_MPM_COPY)) { if (sh->mpm_proto_tcp_ctx_ts != NULL && !sh->mpm_proto_tcp_ctx_ts->global) { SCLogDebug("destroying mpm_ctx %p (sh %p)", sh->mpm_proto_tcp_ctx_ts, sh); mpm_table[sh->mpm_proto_tcp_ctx_ts->mpm_type]. DestroyCtx(sh->mpm_proto_tcp_ctx_ts); SCFree(sh->mpm_proto_tcp_ctx_ts); } /* ready for reuse */ sh->mpm_proto_tcp_ctx_ts = NULL; if (sh->mpm_proto_tcp_ctx_tc != NULL && !sh->mpm_proto_tcp_ctx_tc->global) { SCLogDebug("destroying mpm_ctx %p (sh %p)", sh->mpm_proto_tcp_ctx_tc, sh); mpm_table[sh->mpm_proto_tcp_ctx_tc->mpm_type]. DestroyCtx(sh->mpm_proto_tcp_ctx_tc); SCFree(sh->mpm_proto_tcp_ctx_tc); } /* ready for reuse */ sh->mpm_proto_tcp_ctx_tc = NULL; if (sh->mpm_proto_udp_ctx_ts != NULL && !sh->mpm_proto_udp_ctx_ts->global) { SCLogDebug("destroying mpm_ctx %p (sh %p)", sh->mpm_proto_udp_ctx_ts, sh); mpm_table[sh->mpm_proto_udp_ctx_ts->mpm_type]. DestroyCtx(sh->mpm_proto_udp_ctx_ts); SCFree(sh->mpm_proto_udp_ctx_ts); } /* ready for reuse */ sh->mpm_proto_udp_ctx_ts = NULL; if (sh->mpm_proto_udp_ctx_tc != NULL && !sh->mpm_proto_udp_ctx_tc->global) { SCLogDebug("destroying mpm_ctx %p (sh %p)", sh->mpm_proto_udp_ctx_tc, sh); mpm_table[sh->mpm_proto_udp_ctx_tc->mpm_type]. DestroyCtx(sh->mpm_proto_udp_ctx_tc); SCFree(sh->mpm_proto_udp_ctx_tc); } /* ready for reuse */ sh->mpm_proto_udp_ctx_tc = NULL; if (sh->mpm_proto_other_ctx != NULL && !sh->mpm_proto_other_ctx->global) { SCLogDebug("destroying mpm_ctx %p (sh %p)", sh->mpm_proto_other_ctx, sh); mpm_table[sh->mpm_proto_other_ctx->mpm_type]. DestroyCtx(sh->mpm_proto_other_ctx); SCFree(sh->mpm_proto_other_ctx); } /* ready for reuse */ sh->mpm_proto_other_ctx = NULL; } /* uricontent */ if ((sh->mpm_uri_ctx_ts != NULL) && !(sh->flags & SIG_GROUP_HEAD_MPM_URI_COPY)) { if (sh->mpm_uri_ctx_ts != NULL) { if (!sh->mpm_uri_ctx_ts->global) { SCLogDebug("destroying mpm_uri_ctx %p (sh %p)", sh->mpm_uri_ctx_ts, sh); mpm_table[sh->mpm_uri_ctx_ts->mpm_type].DestroyCtx(sh->mpm_uri_ctx_ts); SCFree(sh->mpm_uri_ctx_ts); } /* ready for reuse */ sh->mpm_uri_ctx_ts = NULL; } } /* stream content */ if ((sh->mpm_stream_ctx_ts != NULL || sh->mpm_stream_ctx_tc != NULL) && !(sh->flags & SIG_GROUP_HEAD_MPM_STREAM_COPY)) { if (sh->mpm_stream_ctx_ts != NULL) { if (!sh->mpm_stream_ctx_ts->global) { SCLogDebug("destroying mpm_stream_ctx %p (sh %p)", sh->mpm_stream_ctx_ts, sh); mpm_table[sh->mpm_stream_ctx_ts->mpm_type].DestroyCtx(sh->mpm_stream_ctx_ts); SCFree(sh->mpm_stream_ctx_ts); } /* ready for reuse */ sh->mpm_stream_ctx_ts = NULL; } if (sh->mpm_stream_ctx_tc != NULL) { if (!sh->mpm_stream_ctx_tc->global) { SCLogDebug("destroying mpm_stream_ctx %p (sh %p)", sh->mpm_stream_ctx_tc, sh); mpm_table[sh->mpm_stream_ctx_tc->mpm_type].DestroyCtx(sh->mpm_stream_ctx_tc); SCFree(sh->mpm_stream_ctx_tc); } /* ready for reuse */ sh->mpm_stream_ctx_tc = NULL; } } if (sh->mpm_hcbd_ctx_ts != NULL) { if (sh->mpm_hcbd_ctx_ts != NULL) { if (!sh->mpm_hcbd_ctx_ts->global) { mpm_table[sh->mpm_hcbd_ctx_ts->mpm_type].DestroyCtx(sh->mpm_hcbd_ctx_ts); SCFree(sh->mpm_hcbd_ctx_ts); } sh->mpm_hcbd_ctx_ts = NULL; } } if (sh->mpm_hsbd_ctx_tc != NULL) { if (sh->mpm_hsbd_ctx_tc != NULL) { if (!sh->mpm_hsbd_ctx_tc->global) { mpm_table[sh->mpm_hsbd_ctx_tc->mpm_type].DestroyCtx(sh->mpm_hsbd_ctx_tc); SCFree(sh->mpm_hsbd_ctx_tc); } sh->mpm_hsbd_ctx_tc = NULL; } } if (sh->mpm_smtp_filedata_ctx_ts != NULL) { if (sh->mpm_smtp_filedata_ctx_ts != NULL) { if (!sh->mpm_smtp_filedata_ctx_ts->global) { mpm_table[sh->mpm_smtp_filedata_ctx_ts->mpm_type].DestroyCtx(sh->mpm_smtp_filedata_ctx_ts); SCFree(sh->mpm_smtp_filedata_ctx_ts); } sh->mpm_smtp_filedata_ctx_ts = NULL; } } if (sh->mpm_hhd_ctx_ts != NULL || sh->mpm_hhd_ctx_tc != NULL) { if (sh->mpm_hhd_ctx_ts != NULL) { if (!sh->mpm_hhd_ctx_ts->global) { mpm_table[sh->mpm_hhd_ctx_ts->mpm_type].DestroyCtx(sh->mpm_hhd_ctx_ts); SCFree(sh->mpm_hhd_ctx_ts); } sh->mpm_hhd_ctx_ts = NULL; } if (sh->mpm_hhd_ctx_tc != NULL) { if (!sh->mpm_hhd_ctx_tc->global) { mpm_table[sh->mpm_hhd_ctx_tc->mpm_type].DestroyCtx(sh->mpm_hhd_ctx_tc); SCFree(sh->mpm_hhd_ctx_tc); } sh->mpm_hhd_ctx_tc = NULL; } } if (sh->mpm_hrhd_ctx_ts != NULL || sh->mpm_hrhd_ctx_tc != NULL) { if (sh->mpm_hrhd_ctx_ts != NULL) { if (!sh->mpm_hrhd_ctx_ts->global) { mpm_table[sh->mpm_hrhd_ctx_ts->mpm_type].DestroyCtx(sh->mpm_hrhd_ctx_ts); SCFree(sh->mpm_hrhd_ctx_ts); } sh->mpm_hrhd_ctx_ts = NULL; } if (sh->mpm_hrhd_ctx_tc != NULL) { if (!sh->mpm_hrhd_ctx_tc->global) { mpm_table[sh->mpm_hrhd_ctx_tc->mpm_type].DestroyCtx(sh->mpm_hrhd_ctx_tc); SCFree(sh->mpm_hrhd_ctx_tc); } sh->mpm_hrhd_ctx_tc = NULL; } } if (sh->mpm_hmd_ctx_ts != NULL) { if (sh->mpm_hmd_ctx_ts != NULL) { if (!sh->mpm_hmd_ctx_ts->global) { mpm_table[sh->mpm_hmd_ctx_ts->mpm_type].DestroyCtx(sh->mpm_hmd_ctx_ts); SCFree(sh->mpm_hmd_ctx_ts); } sh->mpm_hmd_ctx_ts = NULL; } } if (sh->mpm_hcd_ctx_ts != NULL || sh->mpm_hcd_ctx_tc != NULL) { if (sh->mpm_hcd_ctx_ts != NULL) { if (!sh->mpm_hcd_ctx_ts->global) { mpm_table[sh->mpm_hcd_ctx_ts->mpm_type].DestroyCtx(sh->mpm_hcd_ctx_ts); SCFree(sh->mpm_hcd_ctx_ts); } sh->mpm_hcd_ctx_ts = NULL; } if (sh->mpm_hcd_ctx_tc != NULL) { if (!sh->mpm_hcd_ctx_tc->global) { mpm_table[sh->mpm_hcd_ctx_tc->mpm_type].DestroyCtx(sh->mpm_hcd_ctx_tc); SCFree(sh->mpm_hcd_ctx_tc); } sh->mpm_hcd_ctx_tc = NULL; } } if (sh->mpm_hrud_ctx_ts != NULL) { if (sh->mpm_hrud_ctx_ts != NULL) { if (!sh->mpm_hrud_ctx_ts->global) { mpm_table[sh->mpm_hrud_ctx_ts->mpm_type].DestroyCtx(sh->mpm_hrud_ctx_ts); SCFree(sh->mpm_hrud_ctx_ts); } sh->mpm_hrud_ctx_ts = NULL; } } if (sh->mpm_hsmd_ctx_tc != NULL) { if (sh->mpm_hsmd_ctx_tc != NULL) { if (!sh->mpm_hsmd_ctx_tc->global) { mpm_table[sh->mpm_hsmd_ctx_tc->mpm_type].DestroyCtx(sh->mpm_hsmd_ctx_tc); SCFree(sh->mpm_hsmd_ctx_tc); } sh->mpm_hsmd_ctx_tc = NULL; } } if (sh->mpm_hscd_ctx_tc != NULL) { if (sh->mpm_hscd_ctx_tc != NULL) { if (!sh->mpm_hscd_ctx_tc->global) { mpm_table[sh->mpm_hscd_ctx_tc->mpm_type].DestroyCtx(sh->mpm_hscd_ctx_tc); SCFree(sh->mpm_hscd_ctx_tc); } sh->mpm_hscd_ctx_tc = NULL; } } if (sh->mpm_huad_ctx_ts != NULL) { if (sh->mpm_huad_ctx_ts != NULL) { if (!sh->mpm_huad_ctx_ts->global) { mpm_table[sh->mpm_huad_ctx_ts->mpm_type].DestroyCtx(sh->mpm_huad_ctx_ts); SCFree(sh->mpm_huad_ctx_ts); } sh->mpm_huad_ctx_ts = NULL; } } /* dns query */ if (sh->mpm_dnsquery_ctx_ts != NULL) { if (!sh->mpm_dnsquery_ctx_ts->global) { mpm_table[sh->mpm_dnsquery_ctx_ts->mpm_type].DestroyCtx(sh->mpm_dnsquery_ctx_ts); SCFree(sh->mpm_dnsquery_ctx_ts); } sh->mpm_dnsquery_ctx_ts = NULL; } return; } /** \brief Predict a strength value for patterns * * Patterns with high character diversity score higher. * Alpha chars score not so high * Other printable + a few common codes a little higher * Everything else highest. * Longer patterns score better than short patters. * * \param pat pattern * \param patlen length of the patternn * * \retval s pattern score */ uint32_t PatternStrength(uint8_t *pat, uint16_t patlen) { uint8_t a[256]; memset(&a, 0 ,sizeof(a)); uint32_t s = 0; uint16_t u = 0; for (u = 0; u < patlen; u++) { if (a[pat[u]] == 0) { if (isalpha(pat[u])) s += 3; else if (isprint(pat[u]) || pat[u] == 0x00 || pat[u] == 0x01 || pat[u] == 0xFF) s += 4; else s += 6; a[pat[u]] = 1; } else { s++; } } return s; } static void PopulateMpmHelperAddPatternToPktCtx(MpmCtx *mpm_ctx, const DetectContentData *cd, const Signature *s, uint8_t flags, int chop) { uint16_t pat_offset = cd->offset; uint16_t pat_depth = cd->depth; /* recompute offset/depth to cope with chop */ if (chop && (pat_depth || pat_offset)) { pat_offset += cd->fp_chop_offset; if (pat_depth) { pat_depth -= cd->content_len; pat_depth += cd->fp_chop_offset + cd->fp_chop_len; } } if (cd->flags & DETECT_CONTENT_NOCASE) { if (chop) { MpmAddPatternCI(mpm_ctx, cd->content + cd->fp_chop_offset, cd->fp_chop_len, pat_offset, pat_depth, cd->id, s->num, flags); } else { MpmAddPatternCI(mpm_ctx, cd->content, cd->content_len, pat_offset, pat_depth, cd->id, s->num, flags); } } else { if (chop) { MpmAddPatternCS(mpm_ctx, cd->content + cd->fp_chop_offset, cd->fp_chop_len, pat_offset, pat_depth, cd->id, s->num, flags); } else { MpmAddPatternCS(mpm_ctx, cd->content, cd->content_len, pat_offset, pat_depth, cd->id, s->num, flags); } } return; } #define SGH_PROTO(sgh, p) ((sgh)->init->protos[(p)] == 1) #define SGH_DIRECTION_TS(sgh) ((sgh)->init->direction & SIG_FLAG_TOSERVER) #define SGH_DIRECTION_TC(sgh) ((sgh)->init->direction & SIG_FLAG_TOCLIENT) SigMatch *RetrieveFPForSig(Signature *s) { if (s->mpm_sm != NULL) return s->mpm_sm; SigMatch *mpm_sm = NULL, *sm = NULL; int nn_sm_list[DETECT_SM_LIST_MAX]; int n_sm_list[DETECT_SM_LIST_MAX]; memset(nn_sm_list, 0, sizeof(nn_sm_list)); memset(n_sm_list, 0, sizeof(n_sm_list)); int count_nn_sm_list = 0; int count_n_sm_list = 0; int list_id; for (list_id = 0; list_id < DETECT_SM_LIST_MAX; list_id++) { if (!FastPatternSupportEnabledForSigMatchList(list_id)) continue; for (sm = s->sm_lists[list_id]; sm != NULL; sm = sm->next) { if (sm->type != DETECT_CONTENT) continue; DetectContentData *cd = (DetectContentData *)sm->ctx; if ((cd->flags & DETECT_CONTENT_FAST_PATTERN)) return sm; if (cd->flags & DETECT_CONTENT_NEGATED) { n_sm_list[list_id] = 1; count_n_sm_list++; } else { nn_sm_list[list_id] = 1; count_nn_sm_list++; } } /* for */ } /* for */ int *curr_sm_list = NULL; int skip_negated_content = 1; if (count_nn_sm_list > 0) { curr_sm_list = nn_sm_list; } else if (count_n_sm_list > 0) { curr_sm_list = n_sm_list; skip_negated_content = 0; } else { return NULL; } int final_sm_list[DETECT_SM_LIST_MAX]; int count_final_sm_list = 0; int priority; SCFPSupportSMList *tmp = sm_fp_support_smlist_list; while (tmp != NULL) { for (priority = tmp->priority; tmp != NULL && priority == tmp->priority; tmp = tmp->next) { if (curr_sm_list[tmp->list_id] == 0) continue; final_sm_list[count_final_sm_list++] = tmp->list_id; } if (count_final_sm_list != 0) break; } BUG_ON(count_final_sm_list == 0); int max_len = 0; int i; for (i = 0; i < count_final_sm_list; i++) { for (sm = s->sm_lists[final_sm_list[i]]; sm != NULL; sm = sm->next) { if (sm->type != DETECT_CONTENT) continue; DetectContentData *cd = (DetectContentData *)sm->ctx; /* skip_negated_content is only set if there's absolutely no * non-negated content present in the sig */ if ((cd->flags & DETECT_CONTENT_NEGATED) && skip_negated_content) continue; if (max_len < cd->content_len) max_len = cd->content_len; } } for (i = 0; i < count_final_sm_list; i++) { for (sm = s->sm_lists[final_sm_list[i]]; sm != NULL; sm = sm->next) { if (sm->type != DETECT_CONTENT) continue; DetectContentData *cd = (DetectContentData *)sm->ctx; /* skip_negated_content is only set if there's absolutely no * non-negated content present in the sig */ if ((cd->flags & DETECT_CONTENT_NEGATED) && skip_negated_content) continue; if (cd->content_len != max_len) continue; if (mpm_sm == NULL) { mpm_sm = sm; } else { DetectContentData *data1 = (DetectContentData *)sm->ctx; DetectContentData *data2 = (DetectContentData *)mpm_sm->ctx; uint32_t ls = PatternStrength(data1->content, data1->content_len); uint32_t ss = PatternStrength(data2->content, data2->content_len); if (ls > ss) { mpm_sm = sm; } else if (ls == ss) { /* if 2 patterns are of equal strength, we pick the longest */ if (data1->content_len > data2->content_len) mpm_sm = sm; } else { SCLogDebug("sticking with mpm_sm"); } } /* else - if */ } /* for */ } /* for */ return mpm_sm; } /** \internal * \brief The hash function for MpmStore * * \param ht Pointer to the hash table. * \param data Pointer to the MpmStore. * \param datalen Not used in our case. * * \retval hash The generated hash value. */ static uint32_t MpmStoreHashFunc(HashListTable *ht, void *data, uint16_t datalen) { const MpmStore *ms = (MpmStore *)data; uint32_t hash = 0; uint32_t b = 0; for (b = 0; b < ms->sid_array_size; b++) hash += ms->sid_array[b]; return hash % ht->array_size; } /** * \brief The Compare function for MpmStore * * \param data1 Pointer to the first MpmStore. * \param len1 Not used. * \param data2 Pointer to the second MpmStore. * \param len2 Not used. * * \retval 1 If the 2 MpmStores sent as args match. * \retval 0 If the 2 MpmStores sent as args do not match. */ static char MpmStoreCompareFunc(void *data1, uint16_t len1, void *data2, uint16_t len2) { const MpmStore *ms1 = (MpmStore *)data1; const MpmStore *ms2 = (MpmStore *)data2; if (ms1->sid_array_size != ms2->sid_array_size) return 0; if (ms1->buffer != ms2->buffer) return 0; if (ms1->direction != ms2->direction) return 0; if (ms1->sm_list != ms2->sm_list) return 0; if (SCMemcmp(ms1->sid_array, ms2->sid_array, ms1->sid_array_size) != 0) { return 0; } return 1; } /** * \brief Initializes the MpmStore mpm hash table to be used by the detection * engine context. * * \param de_ctx Pointer to the detection engine context. * * \retval 0 On success. * \retval -1 On failure. */ int MpmStoreInit(DetectEngineCtx *de_ctx) { de_ctx->mpm_hash_table = HashListTableInit(4096, MpmStoreHashFunc, MpmStoreCompareFunc, NULL); if (de_ctx->mpm_hash_table == NULL) goto error; return 0; error: return -1; } /** * \brief Adds a MpmStore to the detection engine context MpmStore * * \param de_ctx Pointer to the detection engine context. * \param sgh Pointer to the MpmStore. * * \retval ret 0 on Successfully adding the argument sgh; -1 on failure. */ static int MpmStoreAdd(DetectEngineCtx *de_ctx, MpmStore *s) { int ret = HashListTableAdd(de_ctx->mpm_hash_table, (void *)s, 0); return ret; } /** * \brief Used to lookup a MpmStore from the MpmStore * * \param de_ctx Pointer to the detection engine context. * \param sgh Pointer to the MpmStore. * * \retval rsgh On success a pointer to the MpmStore if the MpmStore is * found in the hash table; NULL on failure. */ static MpmStore *MpmStoreLookup(DetectEngineCtx *de_ctx, MpmStore *s) { MpmStore *rs = HashListTableLookup(de_ctx->mpm_hash_table, (void *)s, 0); return rs; } void MpmStoreReportStats(const DetectEngineCtx *de_ctx) { HashListTableBucket *htb = NULL; uint32_t stats[MPMB_MAX] = {0}; uint32_t appstats[APP_MPMS_MAX] = {0}; for (htb = HashListTableGetListHead(de_ctx->mpm_hash_table); htb != NULL; htb = HashListTableGetListNext(htb)) { const MpmStore *ms = (MpmStore *)HashListTableGetListData(htb); if (ms == NULL) { continue; } if (ms->buffer < MPMB_MAX) stats[ms->buffer]++; else if (ms->sm_list != DETECT_SM_LIST_PMATCH) { int i; for (i = 0; i < APP_MPMS_MAX; i++) { AppLayerMpms *am = &app_mpms[i]; if (ms->sm_list == am->sm_list && ms->direction == am->direction) { SCLogDebug("%s %s: %u patterns. Min %u, Max %u. Ctx %p", am->name, am->direction == SIG_FLAG_TOSERVER ? "toserver":"toclient", ms->mpm_ctx->pattern_cnt, ms->mpm_ctx->minlen, ms->mpm_ctx->maxlen, ms->mpm_ctx); appstats[i]++; break; } } } } uint32_t x; for (x = 0; x < MPMB_MAX; x++) { SCLogInfo("Builtin MPM \"%s\": %u", builtin_mpms[x], stats[x]); } for (x = 0; x < APP_MPMS_MAX; x++) { if (appstats[x] == 0) continue; const char *name = app_mpms[x].name; char *direction = app_mpms[x].direction == SIG_FLAG_TOSERVER ? "toserver" : "toclient"; SCLogInfo("AppLayer MPM \"%s %s\": %u", direction, name, appstats[x]); } } /** * \brief Frees the hash table - DetectEngineCtx->mpm_hash_table, allocated by * MpmStoreInit() function. * * \param de_ctx Pointer to the detection engine context. */ void MpmStoreFree(DetectEngineCtx *de_ctx) { if (de_ctx->mpm_hash_table == NULL) return; HashListTableFree(de_ctx->mpm_hash_table); de_ctx->mpm_hash_table = NULL; return; } void MpmStoreSetup(const DetectEngineCtx *de_ctx, MpmStore *ms) { Signature *s = NULL; // TODO const uint32_t sig; int dir = 0; if (ms->buffer != MPMB_MAX) { BUG_ON(ms->sm_list != DETECT_SM_LIST_PMATCH); switch (ms->buffer) { /* TS is 1 */ case MPMB_TCP_PKT_TS: case MPMB_TCP_STREAM_TS: case MPMB_UDP_TS: dir = 1; break; /* TC is 0 */ default: case MPMB_UDP_TC: case MPMB_TCP_STREAM_TC: case MPMB_TCP_PKT_TC: case MPMB_OTHERIP: /**< use 0 for other */ dir = 0; break; } } else { BUG_ON(ms->sm_list == DETECT_SM_LIST_PMATCH); BUG_ON(ms->direction == 0); BUG_ON(ms->direction == (SIG_FLAG_TOSERVER|SIG_FLAG_TOCLIENT)); if (ms->direction == SIG_FLAG_TOSERVER) dir = 1; else dir = 0; } if (de_ctx->sgh_mpm_context == ENGINE_SGH_MPM_FACTORY_CONTEXT_SINGLE) { ms->mpm_ctx = MpmFactoryGetMpmCtxForProfile(de_ctx, ms->sgh_mpm_context, dir); } else { ms->mpm_ctx = MpmFactoryGetMpmCtxForProfile(de_ctx, MPM_CTX_FACTORY_UNIQUE_CONTEXT, dir); } MpmInitCtx(ms->mpm_ctx, de_ctx->mpm_matcher); /* add the patterns */ for (sig = 0; sig < (ms->sid_array_size * 8); sig++) { if (ms->sid_array[sig / 8] & (1 << (sig % 8))) { s = de_ctx->sig_array[sig]; if (s == NULL) continue; if (s->mpm_sm == NULL) continue; int list = SigMatchListSMBelongsTo(s, s->mpm_sm); if (list < 0) continue; if (list != ms->sm_list) continue; if ((s->flags & ms->direction) == 0) continue; SCLogDebug("adding %u", s->id); DetectContentData *cd = (DetectContentData *)s->mpm_sm->ctx; // TODO const /* TODO move this into cd setup code */ if (cd->flags & DETECT_CONTENT_FAST_PATTERN_CHOP) { if (DETECT_CONTENT_IS_SINGLE(cd) && !(cd->flags & DETECT_CONTENT_NEGATED) && !(cd->flags & DETECT_CONTENT_REPLACE) && cd->content_len == cd->fp_chop_len) { cd->flags |= DETECT_CONTENT_NO_DOUBLE_INSPECTION_REQUIRED; } } else { if (DETECT_CONTENT_IS_SINGLE(cd) && !(cd->flags & DETECT_CONTENT_NEGATED) && !(cd->flags & DETECT_CONTENT_REPLACE)) { cd->flags |= DETECT_CONTENT_NO_DOUBLE_INSPECTION_REQUIRED; } } PopulateMpmHelperAddPatternToPktCtx(ms->mpm_ctx, cd, s, 0, (cd->flags & DETECT_CONTENT_FAST_PATTERN_CHOP)); if (ms->buffer != MPMB_MAX) { /* tell matcher we are inspecting packet */ /* TODO remove! */ if (!(ms->buffer == MPMB_TCP_STREAM_TC || ms->buffer == MPMB_TCP_STREAM_TS)) { s->flags |= SIG_FLAG_MPM_PACKET; s->mpm_pattern_id_div_8 = cd->id / 8; s->mpm_pattern_id_mod_8 = 1 << (cd->id % 8); if (cd->flags & DETECT_CONTENT_NEGATED) { SCLogDebug("flagging sig %"PRIu32" to be looking for negated mpm", s->id); s->flags |= SIG_FLAG_MPM_PACKET_NEG; } } else { /* tell matcher we are inspecting stream */ s->flags |= SIG_FLAG_MPM_STREAM; s->mpm_pattern_id_div_8 = cd->id / 8; s->mpm_pattern_id_mod_8 = 1 << (cd->id % 8); if (cd->flags & DETECT_CONTENT_NEGATED) { SCLogDebug("flagging sig %"PRIu32" to be looking for negated mpm", s->id); s->flags |= SIG_FLAG_MPM_STREAM_NEG; } } } else { /* tell matcher we are inspecting app-layer */ s->mpm_pattern_id_div_8 = cd->id / 8; s->mpm_pattern_id_mod_8 = 1 << (cd->id % 8); s->flags |= SIG_FLAG_MPM_APPLAYER; if (cd->flags & DETECT_CONTENT_NEGATED) s->flags |= SIG_FLAG_MPM_APPLAYER_NEG; } } } if (ms->mpm_ctx != NULL) { if (ms->mpm_ctx->pattern_cnt == 0) { MpmFactoryReClaimMpmCtx(de_ctx, ms->mpm_ctx); ms->mpm_ctx = NULL; } else { if (de_ctx->sgh_mpm_context == ENGINE_SGH_MPM_FACTORY_CONTEXT_FULL) { if (mpm_table[ms->mpm_ctx->mpm_type].Prepare != NULL) { mpm_table[ms->mpm_ctx->mpm_type].Prepare(ms->mpm_ctx); } } } } } /** \brief Get MpmStore for a built-in buffer type * */ MpmStore *MpmStorePrepareBuffer(DetectEngineCtx *de_ctx, SigGroupHead *sgh, enum MpmBuiltinBuffers buf) { const Signature *s = NULL; uint32_t sig; uint32_t cnt = 0; int direction = 0; uint32_t max_sid = DetectEngineGetMaxSigId(de_ctx) / 8 + 1; uint8_t sids_array[max_sid]; memset(sids_array, 0x00, max_sid); int sgh_mpm_context = 0; switch (buf) { case MPMB_TCP_PKT_TS: case MPMB_TCP_PKT_TC: sgh_mpm_context = de_ctx->sgh_mpm_context_proto_tcp_packet; break; case MPMB_TCP_STREAM_TS: case MPMB_TCP_STREAM_TC: sgh_mpm_context = de_ctx->sgh_mpm_context_stream; break; case MPMB_UDP_TS: case MPMB_UDP_TC: sgh_mpm_context = de_ctx->sgh_mpm_context_proto_udp_packet; break; case MPMB_OTHERIP: sgh_mpm_context = de_ctx->sgh_mpm_context_proto_other_packet; break; default: break; } switch(buf) { case MPMB_TCP_PKT_TS: case MPMB_TCP_STREAM_TS: case MPMB_UDP_TS: direction = SIG_FLAG_TOSERVER; break; case MPMB_TCP_PKT_TC: case MPMB_TCP_STREAM_TC: case MPMB_UDP_TC: direction = SIG_FLAG_TOCLIENT; break; case MPMB_OTHERIP: direction = (SIG_FLAG_TOCLIENT|SIG_FLAG_TOSERVER); break; case MPMB_MAX: BUG_ON(1); break; } for (sig = 0; sig < sgh->sig_cnt; sig++) { s = sgh->match_array[sig]; if (s == NULL) continue; if (s->mpm_sm == NULL) continue; int list = SigMatchListSMBelongsTo(s, s->mpm_sm); if (list < 0) continue; if (list != DETECT_SM_LIST_PMATCH) continue; switch (buf) { case MPMB_TCP_PKT_TS: case MPMB_TCP_PKT_TC: if (SignatureHasPacketContent(s) == 1) { sids_array[s->num / 8] |= 1 << (s->num % 8); cnt++; } break; case MPMB_TCP_STREAM_TS: case MPMB_TCP_STREAM_TC: if (SignatureHasStreamContent(s) == 1) { sids_array[s->num / 8] |= 1 << (s->num % 8); cnt++; } break; case MPMB_UDP_TS: case MPMB_UDP_TC: sids_array[s->num / 8] |= 1 << (s->num % 8); cnt++; break; case MPMB_OTHERIP: sids_array[s->num / 8] |= 1 << (s->num % 8); cnt++; break; default: break; } } if (cnt == 0) return NULL; MpmStore lookup = { sids_array, max_sid, direction, buf, DETECT_SM_LIST_PMATCH, 0, NULL}; MpmStore *result = MpmStoreLookup(de_ctx, &lookup); if (result == NULL) { MpmStore *copy = SCCalloc(1, sizeof(MpmStore)); if (copy == NULL) return NULL; uint8_t *sids = SCCalloc(1, max_sid); if (sids == NULL) { SCFree(copy); return NULL; } memcpy(sids, sids_array, max_sid); copy->sid_array = sids; copy->sid_array_size = max_sid; copy->buffer = buf; copy->direction = direction; copy->sm_list = DETECT_SM_LIST_PMATCH; copy->sgh_mpm_context = sgh_mpm_context; MpmStoreSetup(de_ctx, copy); MpmStoreAdd(de_ctx, copy); return copy; } else { return result; } } MpmStore *MpmStorePrepareBuffer2(DetectEngineCtx *de_ctx, SigGroupHead *sgh, AppLayerMpms *am) { const Signature *s = NULL; uint32_t sig; uint32_t cnt = 0; uint32_t max_sid = DetectEngineGetMaxSigId(de_ctx) / 8 + 1; uint8_t sids_array[max_sid]; memset(sids_array, 0x00, max_sid); SCLogDebug("handling %s direction %s for list %d", am->name, am->direction == SIG_FLAG_TOSERVER ? "toserver" : "toclient", am->sm_list); for (sig = 0; sig < sgh->sig_cnt; sig++) { s = sgh->match_array[sig]; if (s == NULL) continue; if (s->mpm_sm == NULL) continue; int list = SigMatchListSMBelongsTo(s, s->mpm_sm); if (list < 0) continue; if ((s->flags & am->direction) == 0) continue; if (list != am->sm_list) continue; sids_array[s->num / 8] |= 1 << (s->num % 8); cnt++; } if (cnt == 0) return NULL; MpmStore lookup = { sids_array, max_sid, am->direction, MPMB_MAX, am->sm_list, 0, NULL}; MpmStore *result = MpmStoreLookup(de_ctx, &lookup); if (result == NULL) { SCLogDebug("new unique mpm for %s %s: %u patterns", am->name, am->direction == SIG_FLAG_TOSERVER ? "toserver" : "toclient", cnt); MpmStore *copy = SCCalloc(1, sizeof(MpmStore)); if (copy == NULL) return NULL; uint8_t *sids = SCCalloc(1, max_sid); if (sids == NULL) { SCFree(copy); return NULL; } memcpy(sids, sids_array, max_sid); copy->sid_array = sids; copy->sid_array_size = max_sid; copy->buffer = MPMB_MAX; copy->direction = am->direction; copy->sm_list = am->sm_list; copy->sgh_mpm_context = am->sgh_mpm_context; MpmStoreSetup(de_ctx, copy); MpmStoreAdd(de_ctx, copy); return copy; } else { return result; } return NULL; } /** \todo fixup old mpm ptrs. We could use the array directly later */ void MpmStoreFixup(SigGroupHead *sgh) { int i = 0; sgh->mpm_uri_ctx_ts = sgh->app_mpms[i++]; sgh->mpm_hrud_ctx_ts = sgh->app_mpms[i++]; sgh->mpm_hhd_ctx_ts = sgh->app_mpms[i++]; sgh->mpm_hhd_ctx_tc = sgh->app_mpms[i++]; sgh->mpm_huad_ctx_ts = sgh->app_mpms[i++]; sgh->mpm_hrhd_ctx_ts = sgh->app_mpms[i++]; sgh->mpm_hrhd_ctx_tc = sgh->app_mpms[i++]; sgh->mpm_hmd_ctx_ts = sgh->app_mpms[i++]; sgh->mpm_smtp_filedata_ctx_ts = sgh->app_mpms[i++]; sgh->mpm_hsbd_ctx_tc = sgh->app_mpms[i++]; sgh->mpm_hsmd_ctx_tc = sgh->app_mpms[i++]; sgh->mpm_hscd_ctx_tc = sgh->app_mpms[i++]; sgh->mpm_hcbd_ctx_ts = sgh->app_mpms[i++]; sgh->mpm_hhhd_ctx_ts = sgh->app_mpms[i++]; sgh->mpm_hrhhd_ctx_ts = sgh->app_mpms[i++]; sgh->mpm_hcd_ctx_ts = sgh->app_mpms[i++]; sgh->mpm_hcd_ctx_tc = sgh->app_mpms[i++]; sgh->mpm_dnsquery_ctx_ts = sgh->app_mpms[i++]; BUG_ON(APP_MPMS_MAX != 18 || i != 18); } /** \brief Prepare the pattern matcher ctx in a sig group head. * */ int PatternMatchPrepareGroup(DetectEngineCtx *de_ctx, SigGroupHead *sh) { MpmStore *mpm_store = NULL; if (SGH_PROTO(sh, IPPROTO_TCP)) { if (SGH_DIRECTION_TS(sh)) { mpm_store = MpmStorePrepareBuffer(de_ctx, sh, MPMB_TCP_PKT_TS); if (mpm_store != NULL) { sh->mpm_proto_tcp_ctx_ts = mpm_store->mpm_ctx; if (sh->mpm_proto_tcp_ctx_ts) sh->flags |= SIG_GROUP_HEAD_MPM_PACKET; } mpm_store = MpmStorePrepareBuffer(de_ctx, sh, MPMB_TCP_STREAM_TS); if (mpm_store != NULL) { BUG_ON(mpm_store == NULL); sh->mpm_stream_ctx_ts = mpm_store->mpm_ctx; if (sh->mpm_stream_ctx_ts) sh->flags |= SIG_GROUP_HEAD_MPM_STREAM; } } if (SGH_DIRECTION_TC(sh)) { mpm_store = MpmStorePrepareBuffer(de_ctx, sh, MPMB_TCP_PKT_TC); if (mpm_store != NULL) { sh->mpm_proto_tcp_ctx_tc = mpm_store->mpm_ctx; if (sh->mpm_proto_tcp_ctx_tc) sh->flags |= SIG_GROUP_HEAD_MPM_PACKET; } mpm_store = MpmStorePrepareBuffer(de_ctx, sh, MPMB_TCP_STREAM_TC); if (mpm_store != NULL) { sh->mpm_stream_ctx_tc = mpm_store->mpm_ctx; if (sh->mpm_stream_ctx_tc) sh->flags |= SIG_GROUP_HEAD_MPM_STREAM; } } } else if (SGH_PROTO(sh, IPPROTO_UDP)) { if (SGH_DIRECTION_TS(sh)) { mpm_store = MpmStorePrepareBuffer(de_ctx, sh, MPMB_UDP_TS); if (mpm_store != NULL) { BUG_ON(mpm_store == NULL); sh->mpm_proto_udp_ctx_ts = mpm_store->mpm_ctx; if (sh->mpm_proto_udp_ctx_ts != NULL) sh->flags |= SIG_GROUP_HEAD_MPM_PACKET; } } if (SGH_DIRECTION_TC(sh)) { mpm_store = MpmStorePrepareBuffer(de_ctx, sh, MPMB_UDP_TC); if (mpm_store != NULL) { sh->mpm_proto_udp_ctx_tc = mpm_store->mpm_ctx; if (sh->mpm_proto_udp_ctx_tc != NULL) sh->flags |= SIG_GROUP_HEAD_MPM_PACKET; } } } else { mpm_store = MpmStorePrepareBuffer(de_ctx, sh, MPMB_OTHERIP); if (mpm_store != NULL) { sh->mpm_proto_other_ctx = mpm_store->mpm_ctx; if (sh->mpm_proto_other_ctx != NULL) sh->flags |= SIG_GROUP_HEAD_MPM_PACKET; } } AppLayerMpms *a = app_mpms; while (a->name != NULL) { mpm_store = MpmStorePrepareBuffer2(de_ctx, sh, a); if (mpm_store != NULL) { sh->app_mpms[a->id] = mpm_store->mpm_ctx; if (sh->app_mpms[a->id] != NULL) sh->flags |= a->flags; } a++; } MpmStoreFixup(sh); return 0; } typedef struct DetectFPAndItsId_ { PatIntId id; uint16_t content_len; uint32_t flags; int sm_list; uint8_t *content; } DetectFPAndItsId; /** * \brief Figured out the FP and their respective content ids for all the * sigs in the engine. * * \param de_ctx Detection engine context. * * \retval 0 On success. * \retval -1 On failure. */ int DetectSetFastPatternAndItsId(DetectEngineCtx *de_ctx) { uint32_t struct_total_size = 0; uint32_t content_total_size = 0; Signature *s = NULL; /* Count the amount of memory needed to store all the structures * and the content of those structures. This will over estimate the * true size, since duplicates are removed below, but counted here. */ for (s = de_ctx->sig_list; s != NULL; s = s->next) { s->mpm_sm = RetrieveFPForSig(s); if (s->mpm_sm != NULL) { DetectContentData *cd = (DetectContentData *)s->mpm_sm->ctx; struct_total_size += sizeof(DetectFPAndItsId); content_total_size += cd->content_len; } } /* array hash buffer - i've run out of ideas to name it */ uint8_t *ahb = SCMalloc(sizeof(uint8_t) * (struct_total_size + content_total_size)); if (unlikely(ahb == NULL)) return -1; uint8_t *content = NULL; uint8_t content_len = 0; PatIntId max_id = 0; DetectFPAndItsId *struct_offset = (DetectFPAndItsId *)ahb; uint8_t *content_offset = ahb + struct_total_size; for (s = de_ctx->sig_list; s != NULL; s = s->next) { if (s->mpm_sm != NULL) { int sm_list = SigMatchListSMBelongsTo(s, s->mpm_sm); BUG_ON(sm_list == -1); DetectContentData *cd = (DetectContentData *)s->mpm_sm->ctx; DetectFPAndItsId *dup = (DetectFPAndItsId *)ahb; if (cd->flags & DETECT_CONTENT_FAST_PATTERN_CHOP) { content = cd->content + cd->fp_chop_offset; content_len = cd->fp_chop_len; } else { content = cd->content; content_len = cd->content_len; } uint32_t flags = cd->flags & DETECT_CONTENT_NOCASE; /* Check for content already found on the same list */ for (; dup != struct_offset; dup++) { if (dup->content_len != content_len) continue; if (dup->sm_list != sm_list) continue; if (dup->flags != flags) continue; /* Check for pattern matching a duplicate. Use case insensitive matching * for case insensitive patterns. */ if (flags & DETECT_CONTENT_NOCASE) { if (SCMemcmpLowercase(dup->content, content, content_len) != 0) continue; } else { /* Case sensitive matching */ if (SCMemcmp(dup->content, content, content_len) != 0) continue; } /* Found a match with a previous pattern. */ break; } if (dup != struct_offset) { /* Exited for-loop before the end, so found an existing match. * Use its ID. */ cd->id = dup->id; continue; } /* Not found, so new content. Give it a new ID and add it * to the array. Copy the content at the end of the * content array. */ struct_offset->id = max_id++; cd->id = struct_offset->id; struct_offset->content_len = content_len; struct_offset->sm_list = sm_list; struct_offset->content = content_offset; struct_offset->flags = flags; content_offset += content_len; if (flags & DETECT_CONTENT_NOCASE) { /* Need to store case-insensitive patterns as lower case * because SCMemcmpLowercase() above assumes that all * patterns are stored lower case so that it doesn't * need to relower its first argument. */ memcpy_tolower(struct_offset->content, content, content_len); } else { memcpy(struct_offset->content, content, content_len); } struct_offset++; } /* if (s->mpm_sm != NULL) */ } /* for */ de_ctx->max_fp_id = max_id; SCFree(ahb); return 0; }