tests/test_udp_content.c

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#include "test_udp_content.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "../decoders/decode_udp.h"
#include "../packets/packet.h"
#include "../engine/jtree.h"
#include <arpa/inet.h>

extern GlobalVars       Globals;

typedef struct udp_content_data{
        unsigned char   udp_content[MAX_CONTENT_LEN];
} UDPContentData;

//#define DEBUG
//#define DEBUGMATCH

int                     UDPDecoderID;
JTree                   UDPContentTree;

#ifdef OLD_MATCH
/********************************************
* Returns TRUE is Candidate is in Packet
********************************************/
int MatchString(char* Candidate, int CLen, char* Packet, int PLen){
        int     i;
        int             j;
#ifdef DEBUGPATH
        printf("In MatchString\n");
#endif

        if (CLen<PLen) return FALSE;
        
        for (i=0;i<PLen-CLen+1;i++){
                if (Packet[i]==Candidate[0]){
                        for (j=1;j<CLen-1;j++){
                                if (Packet[j+i]!=Candidate[j]) break;
                        }
                        if (j==(CLen-1)) return TRUE;
                }
        }

        return FALSE;
}
#endif

/******************************************
* Apply the Test
******************************************/
int TestUDPContent(int PacketSlot, TestNode* Nodes){
        PacketRec*                      p;
#ifdef DEBUGMATCH       
        int                                     i;
#endif  

#ifdef DEBUGPATH
        printf("In TestUDPContent\n");
#endif

#ifdef DEBUG
        printf("Testing UDP Content\n");
#endif  

        p=&Globals.Packets[PacketSlot];
        
        if (!Nodes) return FALSE;
        
#ifdef DEBUGMATCH
        printf("**************************************\n");
        printf("Before applying udp content tests\n");
        for (i=0;i<Globals.NumRules;i++)
        if (RuleIsActive(PacketSlot,i))
                printf("Rule %i is active\n",i);
        else
                printf("Rule %i is inactive\n",i);
        printf("**************************************\n");
#endif  

        MatchStrings(&UDPContentTree, p->RuleBits, p->RawPacket+p->BeginData, p->PacketLen - p->BeginData);
        
#ifdef DEBUGMATCH
        printf("**************************************\n");
        for (i=0;i<Globals.NumRules;i++)
        if (RuleIsActive(PacketSlot,i))
                printf("Rule %i is active\n",i);
        else
                printf("Rule %i is inactive\n",i);
        printf("**************************************\n");
#endif  
                
        return TRUE;
}

/******************************************
* Add a rule node to this test
******************************************/
int UDPContentAddNode(int TestID, int RuleID, char* Args){
        UDPContentData*         data;

#ifdef DEBUGPATH
        printf("In UDPContentAddNode\n");
#endif

#ifdef DEBUG
        printf("Addding a Node with args %s\n",Args);
#endif

        data=calloc(sizeof(UDPContentData),1);
        snprintf(data->udp_content, MAX_CONTENT_LEN, Args);

        if (!AddStringJTree(&UDPContentTree, Args, strlen(Args), RuleID)){
                printf("Failed to add to tree\n");
                free(data);
                data=NULL;
                return FALSE;
        }
        
        return TestAddNode(TestID, RuleID, (void*)data);
}

/****************************************
* Called when we're all done adding rules
****************************************/
int TestUDPContentFinishedSetup(){
#ifdef DEBUGPATH
        printf("In TestUDPContentFinishedSetup\n");
#endif

        return FinalizeJTree(&UDPContentTree);
}

/****************************************
* Set up the test of the UDP Content
*****************************************/
int InitTestUDPContent(){
        int     TestID;

#ifdef DEBUGPATH
        printf("In InitTestUDPContent\n");
#endif

        InitJTree(&UDPContentTree, FALSE);

        TestID=CreateTest("UDPContent");
        if (TestID==TEST_NONE) return FALSE;
        
        if (!BindTestToDecoder(TestID, "UDP")){
                printf("Failed to Bind to UDP\n");
                return FALSE;
        } 
        
        snprintf(Globals.Tests[TestID].ShortName, MAX_NAME_LEN, "content");
        Globals.Tests[TestID].AddNode=UDPContentAddNode;
        Globals.Tests[TestID].TestFunc=TestUDPContent;
        Globals.Tests[TestID].FinishedSetup=TestUDPContentFinishedSetup;
        
        UDPDecoderID=GetDecoderByName("UDP");

        return TRUE;
}

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