From: Michael Altizer (mialtize) <mialtize@cisco.com>
Date: Tue, 13 Sep 2016 18:38:53 +0000 (-0400)
Subject: Merge pull request #618 in SNORT/snort3 from dce_fast_pattern to master
X-Git-Tag: 3.0.0-233~263^2~16
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=8b1c55368414efb4bd94987cdc3904fa3aebdf2c;p=thirdparty%2Fsnort3.git

Merge pull request #618 in SNORT/snort3 from dce_fast_pattern to master

Squashed commit of the following:

commit 1be83a6aa6114539d25f00941bce219b2d5bafab
Author: mdagon <mdagon@cisco.com>
Date:   Tue Sep 13 12:18:04 2016 -0400

    Code review

commit 30ad3f627238c4917920b1e4699331e391235edb
Author: mdagon <mdagon@cisco.com>
Date:   Mon Sep 12 03:01:28 2016 -0400

    Dce iface fast pattern for tcp
---

diff --git a/src/detection/detection_options.cc b/src/detection/detection_options.cc
index 9a027914c..33ce1c633 100644
--- a/src/detection/detection_options.cc
+++ b/src/detection/detection_options.cc
@@ -310,13 +310,14 @@ void print_option_tree(detection_option_tree_node_t* node, int level)
 
     DEBUG_WRAP(
         DebugFormat(DEBUG_DETECT, "%d%*s%*d 0x%x\n",
-            level, indent - offset, option_type_str[node->option_type],
-            54 - indent, node->num_children, node->option_data);
+        level, indent - offset, option_type_str[node->option_type],
+        54 - indent, node->num_children, node->option_data);
 
         for (i=0; i<node->num_children; i++)
             print_option_tree(node->children[i], level+1);
         );
 }
+
 #endif
 
 void* add_detection_option_tree(
@@ -370,13 +371,13 @@ int detection_option_node_evaluate(
         auto last_check = state.last_check;
 
         if ( last_check.ts == p->pkth->ts &&
-             last_check.packet_number == cur_eval_pkt_count &&
-             last_check.rebuild_flag == (p->packet_flags & PKT_REBUILT_STREAM) &&
-             !(p->packet_flags & PKT_ALLOW_MULTIPLE_DETECT) )
+            last_check.packet_number == cur_eval_pkt_count &&
+            last_check.rebuild_flag == (p->packet_flags & PKT_REBUILT_STREAM) &&
+            !(p->packet_flags & PKT_ALLOW_MULTIPLE_DETECT) )
         {
             if ( !last_check.flowbit_failed &&
-                 !(p->packet_flags & PKT_IP_RULE_2ND) &&
-                 !(p->proto_bits & (PROTO_BIT__TEREDO|PROTO_BIT__GTP)) )
+                !(p->packet_flags & PKT_IP_RULE_2ND) &&
+                !(p->proto_bits & (PROTO_BIT__TEREDO|PROTO_BIT__GTP)) )
             {
                 return last_check.result;
             }
@@ -397,7 +398,7 @@ int detection_option_node_evaluate(
         IpsOption* opt = (IpsOption*)node->option_data;
         try_again = opt->retry();
 
-        PatternMatchData* pmd = opt->get_pattern();
+        PatternMatchData* pmd = opt->get_pattern(0, RULE_WO_DIR);
 
         if ( pmd and pmd->last_check )
             content_last = pmd->last_check + get_instance_id();
@@ -409,7 +410,7 @@ int detection_option_node_evaluate(
         switch ( node->option_type )
         {
         case RULE_OPTION_TYPE_LEAF_NODE:
-        // Add the match for this otn to the queue.
+            // Add the match for this otn to the queue.
         {
             OptTreeNode* otn = (OptTreeNode*)node->option_data;
             int16_t app_proto = p->get_application_protocol();
@@ -486,8 +487,8 @@ int detection_option_node_evaluate(
                 if ( content_last )
                 {
                     if ( content_last->ts == p->pkth->ts &&
-                         content_last->packet_number == cur_eval_pkt_count &&
-                         content_last->rebuild_flag == (p->packet_flags & PKT_REBUILT_STREAM) )
+                        content_last->packet_number == cur_eval_pkt_count &&
+                        content_last->rebuild_flag == (p->packet_flags & PKT_REBUILT_STREAM) )
                     {
                         rval = DETECTION_OPTION_NO_MATCH;
                         break;
@@ -520,7 +521,6 @@ int detection_option_node_evaluate(
                 rval = node->evaluate(node->option_data, cursor, p);
 
             break;
-
         }
 
         if ( rval == DETECTION_OPTION_NO_MATCH )
@@ -528,7 +528,6 @@ int detection_option_node_evaluate(
             state.last_check.result = result;
             return result;
         }
-
         else if ( rval == DETECTION_OPTION_FAILED_BIT )
         {
             eval_data->flowbit_failed = 1;
@@ -537,7 +536,6 @@ int detection_option_node_evaluate(
             state.last_check.result = result;
             return 0;
         }
-
         else if ( rval == DETECTION_OPTION_NO_ALERT )
         {
             // Cache the current flowbit_noalert flag, and set it
@@ -590,14 +588,13 @@ int detection_option_node_evaluate(
                                     continue;
                                 }
                             }
-
                             else if ( child_node->option_type == RULE_OPTION_TYPE_CONTENT )
                             {
                                 // Check for an unbounded relative search.  If this
                                 // failed before, it's going to fail again so don't
                                 // go down this path again
                                 IpsOption* opt = (IpsOption*)node->option_data;
-                                PatternMatchData* pmd = opt->get_pattern();
+                                PatternMatchData* pmd = opt->get_pattern(0, RULE_WO_DIR);
 
                                 if ( pmd->unbounded() )
                                 {
@@ -610,7 +607,6 @@ int detection_option_node_evaluate(
                                 }
                             }
                         }
-
                         else if ( child_node->option_type == RULE_OPTION_TYPE_LEAF_NODE )
                             // Leaf node matched, don't eval again
                             continue;
@@ -665,12 +661,11 @@ int detection_option_node_evaluate(
         }
 
         if ( continue_loop &&
-             rval == DETECTION_OPTION_MATCH &&
-             node->relative_children )
+            rval == DETECTION_OPTION_MATCH &&
+            node->relative_children )
         {
             continue_loop = try_again;
         }
-
         else
             continue_loop = false;
 
@@ -747,7 +742,6 @@ static void detection_option_node_update_otn_stats(detection_option_tree_node_t*
         local_stats.latency_timeouts = timeouts;
         local_stats.latency_suspends = suspends;
     }
-
     else
     {
         local_stats.elapsed = node_stats.elapsed;
@@ -812,7 +806,6 @@ void detection_option_tree_update_otn_stats(SFXHASH* doth)
     }
 }
 
-
 detection_option_tree_root_t* new_root()
 {
     detection_option_tree_root_t* p = (detection_option_tree_root_t*)
diff --git a/src/detection/fp_create.cc b/src/detection/fp_create.cc
index 04b2019f3..819da873b 100644
--- a/src/detection/fp_create.cc
+++ b/src/detection/fp_create.cc
@@ -471,7 +471,14 @@ bool set_fp_content(OptTreeNode* otn)
             fp_only = !ofl->ips_opt->fp_research();
         }
 
-        PatternMatchData* tmp = get_pmd(ofl);
+        // Set rule direction
+        RuleDirection dir = RULE_WO_DIR;
+        if (OtnFlowFromServer(otn))
+            dir = RULE_FROM_SERVER;
+        else if (OtnFlowFromClient(otn))
+            dir = RULE_FROM_CLIENT;
+
+        PatternMatchData* tmp = get_pmd(ofl, otn->proto, dir);
 
         if ( !tmp )
             continue;
@@ -537,7 +544,7 @@ static PatternMatchData* get_fp_content(OptTreeNode* otn, OptFpList*& next)
         if ( !ofl->ips_opt )
             continue;
 
-        PatternMatchData* pmd = get_pmd(ofl);
+        PatternMatchData* pmd = get_pmd(ofl, 0, RULE_WO_DIR);
 
         if ( !pmd )
             continue;
@@ -585,8 +592,8 @@ static int fpFinishPortGroupRule(
         {
             static MpseAgent agent =
             {
-                  pmx_create_tree, add_patrn_to_neg_list,
-                  fpDeletePMX, free_detection_option_root, neg_list_free
+                pmx_create_tree, add_patrn_to_neg_list,
+                fpDeletePMX, free_detection_option_root, neg_list_free
             };
 
             pg->mpse[pmd->pm_type] = MpseManager::get_search_engine(
@@ -1924,7 +1931,6 @@ static void PrintFastPatternInfo(OptTreeNode* otn, PatternMatchData* pmd,
         snprintf(buf, sizeof(buf), "%2.02X ", (uint8_t)pattern[i]);
         hex += buf;
         txt += isprint(pattern[i]) ? pattern[i] : '.';
-
     }
     printf("fast pattern[%d] = x%s '%s'\n", pattern_length, hex.c_str(), txt.c_str());
 #else
diff --git a/src/framework/ips_option.h b/src/framework/ips_option.h
index c6a6669c1..b31cea5a3 100644
--- a/src/framework/ips_option.h
+++ b/src/framework/ips_option.h
@@ -51,6 +51,13 @@ enum CursorActionType
     CAT_SET_KEY,
 };
 
+enum RuleDirection
+{
+    RULE_FROM_CLIENT,
+    RULE_FROM_SERVER,
+    RULE_WO_DIR
+};
+
 class SO_PUBLIC IpsOption
 {
 public:
@@ -78,7 +85,7 @@ public:
     { return CAT_NONE; }
 
     // for fast-pattern options like content
-    virtual struct PatternMatchData* get_pattern()
+    virtual struct PatternMatchData* get_pattern(int /*proto*/, RuleDirection)
     { return nullptr; }
 
     static int eval(void* v, Cursor& c, Packet* p)
diff --git a/src/framework/range.cc b/src/framework/range.cc
index 515b9bf04..d0ad2ea3f 100644
--- a/src/framework/range.cc
+++ b/src/framework/range.cc
@@ -177,7 +177,7 @@ void RangeCheck::init()
     min = max = 0;
 }
 
-bool RangeCheck::is_set()
+bool RangeCheck::is_set() const
 {
     return (op != MAX);
 }
@@ -222,7 +222,7 @@ bool RangeCheck::parse(const char* s)
     return true;
 }
 
-bool RangeCheck::eval(long c)
+bool RangeCheck::eval(long c) const
 {
     switch ( op )
     {
diff --git a/src/framework/range.h b/src/framework/range.h
index 9d81a9d1e..d7b330d13 100644
--- a/src/framework/range.h
+++ b/src/framework/range.h
@@ -48,10 +48,10 @@ public:
     bool operator==(const RangeCheck&) const;
 
     void init();
-    bool is_set();
+    bool is_set() const;
     // FIXIT-L add ttl style syntax
     bool parse(const char* s);
-    bool eval(long);
+    bool eval(long) const;
 };
 
 #endif
diff --git a/src/ips_options/ips_content.cc b/src/ips_options/ips_content.cc
index 55c31ddb2..f620c3064 100644
--- a/src/ips_options/ips_content.cc
+++ b/src/ips_options/ips_content.cc
@@ -143,7 +143,7 @@ public:
     int eval(Cursor& c, Packet*) override
     { return CheckANDPatternMatch(config, c); }
 
-    PatternMatchData* get_pattern() override
+    PatternMatchData* get_pattern(int, RuleDirection) override
     { return &config->pmd; }
 
 protected:
@@ -243,10 +243,11 @@ static bool same_buffers(
     }
     return true;
 }
+
 #endif
 
 // FIXIT-P fp, fp_only are set after hash table comparisons so this must
-// return false to avoid unnecessary reevaluation and false positives.
+// return this == &ips to avoid unnecessary reevaluation and false positives.
 // when this is fixed, add PatternMatchData::operator==().
 bool ContentOption::operator==(const IpsOption& ips) const
 {
@@ -286,10 +287,8 @@ bool ContentOption::operator==(const IpsOption& ips) const
     {
         return true;
     }
-#else
-    UNUSED(ips);
 #endif
-    return false;
+    return this == &ips;
 }
 
 //-------------------------------------------------------------------------
@@ -410,7 +409,6 @@ static int CheckANDPatternMatch(ContentData* idx, Cursor& c)
         DebugMessage(DEBUG_PATTERN_MATCH, "Pattern match found\n");
         return DETECTION_OPTION_MATCH;
     }
-
     else
     {
         DebugMessage(DEBUG_PATTERN_MATCH, "Pattern match failed\n");
diff --git a/src/ips_options/ips_regex.cc b/src/ips_options/ips_regex.cc
index 87f6f63b7..73e0e82c4 100644
--- a/src/ips_options/ips_regex.cc
+++ b/src/ips_options/ips_regex.cc
@@ -96,7 +96,7 @@ public:
 
     bool retry() override;
 
-    PatternMatchData* get_pattern() override
+    PatternMatchData* get_pattern(int, RuleDirection) override
     { return &config.pmd; }
 
     int eval(Cursor&, Packet*) override;
@@ -137,7 +137,7 @@ uint32_t RegexOption::hash() const
     return c;
 }
 
-// see ContentOption::operator==() for why this is always false
+// see ContentOption::operator==()
 bool RegexOption::operator==(const IpsOption& ips) const
 {
 #if 0
@@ -146,15 +146,12 @@ bool RegexOption::operator==(const IpsOption& ips) const
 
     RegexOption& rhs = (RegexOption&)ips;
 
-    if ( config.re == rhs.config.re and 
-         config.pmd.flags == rhs.config.pmd.flags and
-         config.pmd.relative == rhs.config.pmd.relative )
+    if ( config.re == rhs.config.re and
+        config.pmd.flags == rhs.config.pmd.flags and
+        config.pmd.relative == rhs.config.pmd.relative )
         return true;
-
-#else
-    UNUSED(ips);
 #endif
-    return false;
+    return this == &ips;
 }
 
 static int hs_match(
@@ -268,7 +265,6 @@ bool RegexModule::set(const char*, Value& v, SnortConfig*)
         config.re.erase(0, 1);
         config.re.erase(config.re.length()-1, 1);
     }
-
     else if ( v.is("nocase") )
     {
         config.pmd.flags |= HS_FLAG_CASELESS;
diff --git a/src/ips_options/ips_sd_pattern.cc b/src/ips_options/ips_sd_pattern.cc
index c595faa8b..62be4b6e7 100644
--- a/src/ips_options/ips_sd_pattern.cc
+++ b/src/ips_options/ips_sd_pattern.cc
@@ -81,7 +81,7 @@ struct SdPatternConfig
     std::string pii;
     unsigned threshold = 1;
     bool obfuscate_pii = false;
-    int (*validate)(const uint8_t* buf, unsigned long long buflen) = nullptr;
+    int (* validate)(const uint8_t* buf, unsigned long long buflen) = nullptr;
 
     inline bool operator==(const SdPatternConfig& rhs) const
     {
@@ -119,7 +119,7 @@ public:
     uint32_t hash() const override;
     bool operator==(const IpsOption&) const override;
 
-    PatternMatchData* get_pattern() override
+    PatternMatchData* get_pattern(int, RuleDirection) override
     { return &config.pmd; }
 
     int eval(Cursor&, Packet* p) override;
@@ -136,7 +136,7 @@ SdPatternOption::SdPatternOption(const SdPatternConfig& c) :
     {
         // FIXIT-L why is this failing but everything is working?
         ParseError("can't initialize sd_pattern for %s (%d) %p",
-                config.pii.c_str(), err, (void*)s_scratch);
+            config.pii.c_str(), err, (void*)s_scratch);
     }
 
     config.pmd.pattern_buf = config.pii.c_str();
@@ -146,7 +146,7 @@ SdPatternOption::SdPatternOption(const SdPatternConfig& c) :
 }
 
 SdPatternOption::~SdPatternOption()
-{ 
+{
     if ( config.db )
         hs_free_database(config.db);
 }
@@ -173,10 +173,10 @@ bool SdPatternOption::operator==(const IpsOption& ips) const
     return false;
 }
 
-struct hsContext 
+struct hsContext
 {
-    hsContext(const SdPatternConfig &c_, Packet* p_, const uint8_t* const start_)
-        : config(c_), packet(p_), start(start_) {}
+    hsContext(const SdPatternConfig& c_, Packet* p_, const uint8_t* const start_)
+        : config(c_), packet(p_), start(start_) { }
 
     unsigned int count = 0;
 
@@ -209,7 +209,7 @@ static int hs_match(unsigned int /*id*/, unsigned long long from,
             ctx->packet->obfuscator = new Obfuscator();
 
         uint32_t off = ctx->buf - ctx->start;
-        // FIXIT-L Make configurable or don't show any PII partials (0 for user defined??) 
+        // FIXIT-L Make configurable or don't show any PII partials (0 for user defined??)
         len = len > 4 ? len - 4 : len;
         ctx->packet->obfuscator->push(off, len);
     }
@@ -323,13 +323,11 @@ bool SdPatternModule::set(const char*, Value& v, SnortConfig* sc)
         config.validate = SdLuhnAlgorithm;
         config.obfuscate_pii = sc->obfuscate_pii;
     }
-
     else if (config.pii == "us_social")
     {
         config.pii = SD_SOCIAL_PATTERN;
         config.obfuscate_pii = sc->obfuscate_pii;
     }
-
     else if (config.pii == "us_social_nodashes")
     {
         config.pii = SD_SOCIAL_NODASHES_PATTERN;
@@ -343,7 +341,8 @@ bool SdPatternModule::end(const char*, int, SnortConfig*)
 {
     hs_compile_error_t* err = nullptr;
 
-    if ( hs_compile(config.pii.c_str(), HS_FLAG_DOTALL|HS_FLAG_SOM_LEFTMOST, HS_MODE_BLOCK, nullptr, &config.db, &err)
+    if ( hs_compile(config.pii.c_str(), HS_FLAG_DOTALL|HS_FLAG_SOM_LEFTMOST, HS_MODE_BLOCK,
+        nullptr, &config.db, &err)
         or !config.db )
     {
         ParseError("can't compile regex '%s'", config.pii.c_str());
@@ -407,7 +406,7 @@ static IpsOption* sd_pattern_ctor(Module* m, OptTreeNode*)
 }
 
 static void sd_pattern_dtor(IpsOption* p)
-{ 
+{
     delete p;
 }
 
diff --git a/src/parser/parse_rule.cc b/src/parser/parse_rule.cc
index d0c45ea23..c93c5e00e 100644
--- a/src/parser/parse_rule.cc
+++ b/src/parser/parse_rule.cc
@@ -816,7 +816,7 @@ static void XferHeader(RuleTreeNode* test_node, RuleTreeNode* rtn)
  *
  ***************************************************************************/
 static void AddRuleFuncToList(
-    int (* rfunc) (Packet*, RuleTreeNode*, struct RuleFpList*, int),
+    int (* rfunc)(Packet*, RuleTreeNode*, struct RuleFpList*, int),
     RuleTreeNode* rtn)
 {
     RuleFpList* idx;
@@ -1143,17 +1143,17 @@ static int mergeDuplicateOtn(
     return 1;
 }
 
-PatternMatchData* get_pmd(OptFpList* ofl)
+PatternMatchData* get_pmd(OptFpList* ofl, int proto, RuleDirection direction)
 {
     if ( !ofl->ips_opt )
         return nullptr;
 
-    return ofl->ips_opt->get_pattern();
+    return ofl->ips_opt->get_pattern(proto, direction);
 }
 
 static void finalize_content(OptFpList* ofl)
 {
-    PatternMatchData* pmd = get_pmd(ofl);
+    PatternMatchData* pmd = get_pmd(ofl, 0, RULE_WO_DIR);
 
     if ( !pmd )
         return;
@@ -1165,7 +1165,7 @@ static void finalize_content(OptFpList* ofl)
 
 bool is_fast_pattern_only(OptFpList* ofl)
 {
-    PatternMatchData* pmd = get_pmd(ofl);
+    PatternMatchData* pmd = get_pmd(ofl, 0, RULE_WO_DIR);
 
     if ( !pmd )
         return false;
@@ -1175,7 +1175,7 @@ bool is_fast_pattern_only(OptFpList* ofl)
 
 static void clear_fast_pattern_only(OptFpList* ofl)
 {
-    PatternMatchData* pmd = get_pmd(ofl);
+    PatternMatchData* pmd = get_pmd(ofl, 0, RULE_WO_DIR);
 
     if ( pmd && pmd->fp_only > 0 )
         pmd->fp_only = 0;
@@ -1199,7 +1199,7 @@ static void ValidateFastPattern(OptTreeNode* otn)
         }
 
         // reset the check if one of these are present.
-        if ( fpl->ips_opt and !fpl->ips_opt->get_pattern() )
+        if ( fpl->ips_opt and !fpl->ips_opt->get_pattern(0, RULE_WO_DIR))
         {
             if ( fpl->ips_opt->get_cursor_type() > CAT_NONE )
                 relative_is_bad_mkay = false;
@@ -1536,7 +1536,7 @@ const char* parse_rule_close(SnortConfig* sc, RuleTreeNode& rtn, OptTreeNode* ot
      * After otn processing we can finalize port object processing for this rule
      */
     if ( FinishPortListRule(
-            sc->port_tables, new_rtn, otn, rtn.proto, has_fp, sc->fast_pattern_config) )
+        sc->port_tables, new_rtn, otn, rtn.proto, has_fp, sc->fast_pattern_config) )
         ParseError("Failed to finish a port list rule.");
 
     return nullptr;
diff --git a/src/parser/parse_rule.h b/src/parser/parse_rule.h
index dcd535fda..20b23a05e 100644
--- a/src/parser/parse_rule.h
+++ b/src/parser/parse_rule.h
@@ -21,6 +21,7 @@
 #define PARSE_RULE_H
 
 #include "detection/rules.h"
+#include "framework/ips_option.h"
 
 struct OptFpList;
 struct OptTreeNode;
@@ -44,7 +45,7 @@ OptTreeNode* parse_rule_open(SnortConfig*, RuleTreeNode&, bool stub = false);
 const char* parse_rule_close(SnortConfig*, RuleTreeNode&, OptTreeNode*);
 
 bool is_fast_pattern_only(OptFpList*);
-struct PatternMatchData* get_pmd(OptFpList*);
+struct PatternMatchData* get_pmd(OptFpList*, int proto, RuleDirection);
 
 int get_rule_count();
 
diff --git a/src/service_inspectors/dce_rpc/ips_dce_iface.cc b/src/service_inspectors/dce_rpc/ips_dce_iface.cc
index 765e661e4..72aca4631 100644
--- a/src/service_inspectors/dce_rpc/ips_dce_iface.cc
+++ b/src/service_inspectors/dce_rpc/ips_dce_iface.cc
@@ -29,8 +29,11 @@
 #include "framework/range.h"
 #include "detection/detect.h"
 #include "detection/detection_defines.h"
+#include "detection/pattern_match_data.h"
 #include "hash/sfhashfcn.h"
 #include "profiler/profiler.h"
+#include "target_based/snort_protocols.h"
+#include "main/snort_debug.h"
 
 //-------------------------------------------------------------------------
 // dcerpc2 interface rule options
@@ -199,19 +202,72 @@ class Dce2IfaceOption : public IpsOption
 {
 public:
     Dce2IfaceOption(RangeCheck iface_version, bool iface_any_frag, Uuid iface_uuid) :
-        IpsOption(s_name)
-    { version = iface_version; any_frag = iface_any_frag; uuid = iface_uuid; }
+        IpsOption(s_name), version(iface_version), any_frag(iface_any_frag), uuid(iface_uuid)
+    {
+        memset(&pmd, 0, sizeof(pmd));
+    }
 
     uint32_t hash() const override;
     bool operator==(const IpsOption&) const override;
     int eval(Cursor&, Packet*) override;
+    PatternMatchData* get_pattern(int proto, RuleDirection direction) override;
+    ~Dce2IfaceOption();
 
 private:
-    RangeCheck version;
-    bool any_frag;
-    Uuid uuid;
+    const RangeCheck version;
+    const bool any_frag;
+    const Uuid uuid;
+    PatternMatchData pmd;
 };
 
+Dce2IfaceOption::~Dce2IfaceOption()
+{
+    if ( pmd.pattern_buf)
+    {
+        snort_free((char*)pmd.pattern_buf);
+    }
+}
+
+PatternMatchData* Dce2IfaceOption::get_pattern(int proto, RuleDirection direction)
+{
+    if (pmd.pattern_buf)
+    {
+        return &pmd;
+    }
+
+    if (proto == SNORT_PROTO_TCP)
+    {
+        const char client_fp[] = "\x05\x00\x00";
+        const char server_fp[] = "\x05\x00\x02";
+        const char no_dir_fp[] = "\x05\x00";
+
+        switch (direction)
+        {
+        case RULE_FROM_CLIENT:
+            pmd.pattern_size = 3;
+            pmd.pattern_buf = (char*)snort_alloc(pmd.pattern_size);
+            memcpy((void*)pmd.pattern_buf, client_fp, pmd.pattern_size);
+            break;
+
+        case RULE_FROM_SERVER:
+            pmd.pattern_size = 3;
+            pmd.pattern_buf = (char*)snort_alloc(pmd.pattern_size);
+            memcpy((void*)pmd.pattern_buf, server_fp, pmd.pattern_size);
+            break;
+
+        default:
+            pmd.pattern_size = 2;
+            pmd.pattern_buf = (char*)snort_alloc(pmd.pattern_size);
+            memcpy((void*)pmd.pattern_buf, no_dir_fp, pmd.pattern_size);
+            break;
+        }
+        return &pmd;
+    }
+    // FIXIT-L add udp fast pattern
+
+    return nullptr;
+}
+
 uint32_t Dce2IfaceOption::hash() const
 {
     uint32_t a, b, c;
@@ -244,19 +300,11 @@ uint32_t Dce2IfaceOption::hash() const
 
 bool Dce2IfaceOption::operator==(const IpsOption& ips) const
 {
-    if ( strcmp(get_name(), ips.get_name()) )
-        return false;
-
-    const Dce2IfaceOption& rhs = (Dce2IfaceOption&)ips;
-
-    if ((DCE2_UuidCompare(&uuid, &rhs.uuid) == 0) &&
-        (version == rhs.version) &&
-        (any_frag == rhs.any_frag))
-    {
-        return true;
-    }
-
-    return false;
+    // FIXIT-L
+    // Fast pattern is calculated only after the entire rule is parsed.
+    // The rule option can be mistaken as a duplicate because we don't take the fast pattern into
+    // account. Instead of comparing values, make sure it is the same object.
+    return this == &ips;
 }
 
 int Dce2IfaceOption::eval(Cursor&, Packet* p)