tests/test_ethernet_type.c

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#include "test_ethernet_type.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <netinet/in.h>
#include "../decoders/decode_ethernet.h"
#include "../packets/packet.h"
#include "../engine/num_list.h"

extern GlobalVars       Globals;

typedef struct ethernet_type_data{
        NumList*                Types;
} EthernetTypeData;

//#define DEBUG
//#define DEBUGMATCH

int EthernetDecoderID;

/******************************************
* Apply the Test
******************************************/
int TestEthernetType(int PacketSlot, TestNode* Nodes){
        unsigned short          EType;
        EthernetTypeData*       data;
        EthernetData*           EData;
        TestNode*                       Node;
        int                                     i;
        PacketRec*                      p;

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

#ifdef DEBUG
        printf("Testing Ethernet type\n");
#endif  
        
        p=&Globals.Packets[PacketSlot];
        
        /*get the type out of the ethernet header*/
        /*todo: make this more efficient*/
        for (i=p->NumDecoderData; i>=0;i--){
                if (p->DecoderInfo[i].DecoderID==EthernetDecoderID){
                        EData=(EthernetData*)p->DecoderInfo[i].Data;
                        EType=ntohs(EData->Header->Type);
                        break;
                }
        }
        
        if (i==-1){
#ifdef DEBUG    
                printf("Couldn't find the ethernet header\n");
#endif          
                return FALSE;
        }

#ifdef DEBUGMATCH
        printf("\n\n"); 
        printf("**************************************\n");
        printf("Before applying interface name 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=(EthernetTypeData*)Node->Data;
                        if (!IsInList(data->Types,EType)){
#ifdef DEBUGMATCH
                                printf("Ethernet Type %04x does not match test value %04x\n",EType, data->EthernetType);
#endif                  
                                SetRuleInactive(PacketSlot, Node->RuleID);
                        }
#ifdef DEBUGMATCH                       
                        else{
                                printf("Ethernet Type Matches\n");
                        }
                }else{
                        printf("Rule is inactive\n");
#endif                  
                }
                Node=Node->Next;
        }
        
#ifdef DEBUGMATCH
        printf("**************************************\n");
        printf("After applying interface name 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  
                
        return TRUE;
}

/******************************************
* Add a rule node to this test
******************************************/
int EthernetTypeAddNode(int TestID, int RuleID, char* Args){
        EthernetTypeData*       data;
        NumAlias                        Aliases[2];
        
#ifdef DEBUGPATH
        printf("In EthernetTypeAddNode\n");
#endif

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

        sprintf(Aliases[0].Alias, "IP");
        Aliases[0].Num=ETHERNET_TYPE_IP;
        sprintf(Aliases[1].Alias, "ARP");
        Aliases[1].Num=ETHERNET_TYPE_ARP;


        data=calloc(sizeof(EthernetTypeData),1);
        data->Types=InitNumList(LIST_TYPE_NORMAL);

        if (!AddRangesString(data->Types, Args, Aliases, 2)){
                printf("Couldn't add data\n");
                free(data);
                return FALSE;
        }
        
        return TestAddNode(TestID, RuleID, (void*)data);
}

/****************************************
* Set up the test of the Ethernet Type Field
*****************************************/
int InitTestEthernetType(){
        int     TestID;

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

        TestID=CreateTest("EthernetType");
        if (TestID==TEST_NONE) return FALSE;
        
        if (!BindTestToDecoder(TestID, "Ethernet")){
                printf("Failed to Bind to Ethernet\n");
                return FALSE;
        } 
        
        snprintf(Globals.Tests[TestID].ShortName, MAX_NAME_LEN, "type");
        Globals.Tests[TestID].AddNode=EthernetTypeAddNode;
        Globals.Tests[TestID].TestFunc=TestEthernetType;
        
        EthernetDecoderID=GetDecoderByName("Ethernet");

        return TRUE;
}

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