routes/route_arp.c

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#include "route_arp.h"
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include "../packets/packet.h"
#include "../engine/num_list.h"
#include "../decoders/decode_arp.h"
#include <arpa/inet.h>
#include <netinet/in.h>

int                     ARPDecoderID;

//#define DEBUG

extern GlobalVars       Globals;

/*********************************
* Explicitly handle arp requests
**********************************/
int RouteARP(int PacketSlot){
        PacketRec*      p;
        ARPData*        Arp;
        
#ifdef DEBUGPATH
        printf("In RouteARP\n");
#endif

        p=&Globals.Packets[PacketSlot];

        if (!GetDataByID(PacketSlot, ARPDecoderID, (void**)&Arp)){
#ifdef DEBUG
                printf("This isn't an ARP packet\n");
#endif          
                return ROUTE_RESULT_CONTINUE;
        }
        
#ifdef DEBUG
        printf("Routing an ARP packet\n");
#endif

        if ( 
                (ntohs(Arp->Header->Operation)==ARP_OP_REQUEST) ||
                (ntohs(Arp->Header->Operation)==ARP_OP_REPLY)
        ){
                /*send arp requests and arp replies out the broadcast*/
#ifdef DEBUG
                printf("ARP:Setting packet to broacast\n");
#endif
                Globals.Packets[PacketSlot].TargetInterface=INTERFACE_BROADCAST;
                return ROUTE_RESULT_DONE;
        }

#ifdef DEBUG
        printf("Wasn't a known ARP type %04X\n",ntohs(Arp->Header->Operation));
#endif

        return ROUTE_RESULT_CONTINUE;
}

/*********************************
* Turn on explicit ARP handling
**********************************/
int RouteARPAddNode(int RouteID, char* Args){
#ifdef DEBUGPATH
        printf("In RouteARPAddNode\n");
#endif

        return TRUE;
}

/*********************************
* Set up everything to do
* explict ARP handling
**********************************/
int InitRouteARP(){
        int RouteID;
#ifdef DEBUGPATH
        printf("In InitARP\n");
#endif  
        
        if ( (RouteID=CreateRoute("ARP"))==ROUTE_NONE){
                printf("Couldn't create route ARP\n");
                return FALSE;
        }
        
        Globals.Routes[RouteID].RouteFunc=RouteARP;
        Globals.Routes[RouteID].AddNode=RouteARPAddNode;
        
        return TRUE;
}

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