watchdog处理接收到的数据包

watchdog读取数据包，维护以下四个包计数器。

    float readed_packets;
    float ip_packets;
    float arp_packets;
    float interesting_readed_packets;

如果是ARP,AODV数据包，则维护邻居。

如果是IP报文，则interesting_readed_packets++。若接收到的是来源于自身的报文，则调用ownPacketDetected，否则维护邻居表，并针对非广播报文调用neighboursPacketDetected

/**
 * Read one packet of the network device.
 */
void
WATCHDOG::readPacket(int32_t source_ip, int32_t destination_ip, int source_mac, int destination_mac, int sourcePort, int destinationPort, packet_t packet_type, char * tmp_data, double pktime) {
    if (debug > 2) printf("Reading packet\n");
    readed_packets++;

    if (packet_type == PT_ARP) { /* Is a ARP packet*/
        arp_packets++;
        if (source_ip == ownIP) { /* is my own ARP packet*/
            //ownMAC = source_mac;
        } else { /* Is a neighbour ARP packet */
            neigs->AssignIpToNeighbour(source_mac, source_ip, isInterestingPacket(source_ip, source_mac, destination_ip, destination_mac), pktime, ownMAC);
            /* Show debug data */
            if ((debug > 1) && isInterestingPacket(source_ip, source_mac, destination_ip, destination_mac)) {
                //PrintArpPacketInformation(n);
                //ShowAllNeighbours(&neigs);
            }
        } 
    } else if (packet_type == PT_AODV){ /* Is a AODV packet */
        if(destination_ip ==-1 && destination_mac == -1 && sourcePort == 255 && destinationPort == 255 && packet_type == 38){ /* Broadcast AODV packets, are sended by the own node.*/
            neigs->AssignIpToNeighbour(source_mac, source_ip, 1, pktime, ownMAC);
        }
    } else { /* Is a IP packet */
        ip_packets++;
        /* is my packet */
        if (source_mac == ownMAC) {
            ownPacketDetected(source_ip, destination_ip, sourcePort, destinationPort, destination_mac, tmp_data, packet_type, pktime);
            interesting_readed_packets++;
        } else {
            if (isInterestingPacket(source_ip, source_mac, destination_ip, destination_mac)) {
                interesting_readed_packets++;
                neigs->AssignIpToNeighbour(source_mac, source_mac, isInterestingPacket(source_ip, source_mac, destination_ip, destination_mac), pktime, ownMAC);   //This is because ns2 does not work well and the watchdog may be can not listen the AODV or ARP packets to obtain the IP of a node. But, we it is equal to the MAC!!!!
               neighboursPacketDetected(source_ip, destination_ip, source_mac, destination_mac, sourcePort, destinationPort, tmp_data, packet_type, pktime);
            } else if(source_ip!=-1 && source_mac!=-1 && (destination_mac==-1)) {
                /* Broadcast message*/
                neigs->AssignIpToNeighbour(source_mac, source_ip, 1, pktime, ownMAC);                
            }
        }
    }
}

/**
 * Determines if a packet is interesting for a net.
 */
int
WATCHDOG::isInterestingPacket(int32_t source_ip, int source_mac, int32_t destination_ip, int destination_mac) {
    /* No broadcast */
    if(destination_ip!=-1 && source_mac!=-1 && destination_mac!=-1){
        return 1;
    }
    
    return 0;
}