tests/test_tcp_src.c

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#include "test_tcp_src.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "../decoders/decode_tcp.h"
#include "../packets/packet.h"
#include <arpa/inet.h>
#include "../engine/num_list.h"

extern GlobalVars       Globals;

typedef struct tcp_src_data{
        NumList*                Ports;
} TCPSrcData;

//#define DEBUG
//#define DEBUGMATCH

int TCPDecoderID;

/******************************************
* Apply the Test
******************************************/
int TestTCPSrc(int PacketSlot, TestNode* Nodes){
        unsigned short          TCPSrc;
        TCPSrcData*                     data;
        TCPData*                        TData;
        TestNode*                       Node;
        int                                     i;
        PacketRec*                      p;

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

#ifdef DEBUG
        printf("Testing TCP Src\n");
#endif  
        
        p=&Globals.Packets[PacketSlot];
        
        if (!Nodes) return FALSE;
        
        /*get the src out of the tcp header*/
        /*todo: make this more efficient*/
        for (i=p->NumDecoderData; i>=0;i--){
                if (p->DecoderInfo[i].DecoderID==TCPDecoderID){
                        TData=(TCPData*)p->DecoderInfo[i].Data;
                        TCPSrc=ntohs(TData->Header->source);
                        break;
                }
        }
        
        if (i==-1){
#ifdef DEBUG    
                printf("Couldn't find the tcp header\n");
#endif          
                return FALSE;
        }

#ifdef DEBUGMATCH
        printf("**************************************\n");
        printf("Before applying tcp src tests\n");
        for (i=0;i<Globals.NumRules;i++)
        if (RuleIsActive(p,i))
                printf("Rule %i is active\n",i);
        else
                printf("Rule %i is inactive\n",i);
        printf("**************************************\n");
#endif  
        
        Node=Nodes;
        while(Node){
                if (RuleIsActive(PacketSlot, Node->RuleID)){
                        data=(TCPSrcData*)Node->Data;
                        if (!IsInList(data->Ports, TCPSrc)){
#ifdef DEBUGMATCH
                                printf("TCP Src %u doesn't match %u\n", data->tcp_src, TCPSrc);
#endif                  
                                SetRuleInactive(PacketSlot, Node->RuleID);
                        }
#ifdef DEBUGMATCH                       
                        else{
                                printf("TCP Src Matches\n");
                        }
                }else{
                        printf("Rule is inactive\n");
#endif                  
                }
                Node=Node->Next;
        }
        
#ifdef DEBUGMATCH
        printf("**************************************\n");
        for (i=0;i<Globals.NumRules;i++)
        if (RuleIsActive(p,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 TCPSrcAddNode(int TestID, int RuleID, char* Args){
        TCPSrcData*                     data;

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

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

        data=calloc(sizeof(TCPSrcData),1);

        /*set up the number list*/
        data->Ports=InitNumList(LIST_TYPE_NORMAL);
        if (!AddRangesString(data->Ports, Args, NULL, 0)){
                free(data);
                data=NULL;
                return FALSE;
        }
        
        return TestAddNode(TestID, RuleID, (void*)data);
}

/****************************************
* Set up the test of the TCP Src Field
*****************************************/
int InitTestTCPSrc(){
        int     TestID;

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

        TestID=CreateTest("TCPSrc");
        if (TestID==TEST_NONE) return FALSE;
        
        if (!BindTestToDecoder(TestID, "TCP")){
                printf("Failed to Bind to TCP\n");
                return FALSE;
        } 
        
        snprintf(Globals.Tests[TestID].ShortName, MAX_NAME_LEN, "src");
        Globals.Tests[TestID].AddNode=TCPSrcAddNode;
        Globals.Tests[TestID].TestFunc=TestTCPSrc;
        
        TCPDecoderID=GetDecoderByName("TCP");

        return TRUE;
}

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