tests/test_ip_ttl.c

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#include "test_ip_ttl.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "../decoders/decode_ip.h"
#include "../packets/packet.h"
#include <arpa/inet.h>
#include "../engine/num_list.h"
#include "../engine/bits.h"

extern GlobalVars       Globals;

typedef struct ip_ttl_data{
        NumList*                                TTLs;
        unsigned char                   RuleBits[MAX_RULES/8];
        struct ip_ttl_data*     Next;
} IPTTLData;

//#define DEBUG
//#define DEBUGMATCH

int IPDecoderID;
IPTTLData*      IPTTLHead;

/******************************************
* Apply the Test with collapsed rules
******************************************/
int TestIPTTL(int PacketSlot, TestNode* Nodes){
        unsigned char           IPTTL;
        IPTTLData*                      t;
        IPData*                         IData;
        int                                     i;
        PacketRec*                      p;

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

#ifdef DEBUG
        printf("Testing IP TTL\n");
#endif  
        
        if (!Nodes) return FALSE;
        
        p=&Globals.Packets[PacketSlot];
        
        /*get the ttl out of the ip header*/
        if (!GetDataByID(PacketSlot, IPDecoderID, (void**)&IData)){
                printf("Failed to get IP header data\n");
                return FALSE;
        }

        IPTTL=IData->Header->ttl;
        
        if (i==-1){
#ifdef DEBUG    
                printf("Couldn't find the ip header\n");
#endif          
                return FALSE;
        }

#ifdef DEBUGMATCH
        printf("**************************************\n");
        printf("Before applying ip ttl 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  
        
        t=IPTTLHead;
        while (t){
                if (!IsInList(t->TTLs, IPTTL)){
                        /*mark these rules as inactive*/
                        NotAndBitFields(p->RuleBits, t->RuleBits, p->RuleBits, Globals.NumRules);
                }
                t=t->Next;
        }
                
#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 IPTTLAddNode(int TestID, int RuleID, char* Args){
        IPTTLData*                      data;
        IPTTLData*                      t;
        IPTTLData*                      last;
#ifdef DEBUG    
        int                                     i;
#endif

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

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

        data=calloc(sizeof(IPTTLData),1);
        
        /*set up the number list*/
        data->TTLs=InitNumList(LIST_TYPE_NORMAL);
        if (!AddIPRanges(data->TTLs, Args)){
                free(data);
                data=NULL;
                return FALSE;
        }
        
        /*check to see if this is a duplicate*/
        if (!IPTTLHead){
#ifdef DEBUG
                printf("First IP Dest\n");
#endif  
                IPTTLHead=data;
                SetBit(data->RuleBits, Globals.NumRules, RuleID, 1);
                return TestAddNode(TestID, RuleID, (void*)data);
        }else{
                t=IPTTLHead;
                last=t;
                while (t){
                        if (NumListCompare(data->TTLs, t->TTLs)){
#ifdef DEBUG
                                printf("This is a duplicate\n");
#endif                  
                                DestroyNumList(data->TTLs);
                                free(data);
                                data=NULL;
                                SetBit(t->RuleBits, Globals.NumRules, RuleID, 1);
#ifdef DEBUG1
                                for (i=0;i<Globals.NumRules+1;i++)
                                if (GetBit(t->RuleBits, Globals.NumRules, i))
                                printf("Bit %i is set\n",i);
#endif                          
                                return TestAddNode(TestID, RuleID, (void*)t);           
                        }
                        
                        last=t;
                        t=t->Next;
                }
                
#ifdef DEBUG
                printf("This is a new one\n");
#endif          
                last->Next=data;
                SetBit(data->RuleBits, Globals.NumRules, RuleID, 1);
                return TestAddNode(TestID, RuleID, (void*)data);                
        }
}

/****************************************
* Set up the test of the IP TTL Field
*****************************************/
int InitTestIPTTL(){
        int     TestID;

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

        IPTTLHead=NULL;

        TestID=CreateTest("IPTTL");
        if (TestID==TEST_NONE) return FALSE;
        
        if (!BindTestToDecoder(TestID, "IP")){
                printf("Failed to Bind to IP\n");
                return FALSE;
        } 
        
        snprintf(Globals.Tests[TestID].ShortName, MAX_NAME_LEN, "ttl");
        Globals.Tests[TestID].AddNode=IPTTLAddNode;
        Globals.Tests[TestID].TestFunc=TestIPTTL;
        
        IPDecoderID=GetDecoderByName("IP");

        return TRUE;
}

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