定义广播包结构体
struct hdr_broadcastbase {
nsaddr_t src; //Source IP Address
// Packet header access functions
static int offset_;
inline static int& offset() {return offset_; }
inline static hdr_broadcastbase* access(const Packet* p) {
return (hdr_broadcastbase*) p->access(offset_);
}
};
从Agent类继承广播应用类
class BroadcastbaseAgent : public Agent {
friend class SendTimer;
public:
BroadcastbaseAgent();
int command(int argc, const char*const* argv);
private:
void sendit();
inline double next_snd_time();
SendTimer snd_timer_; // SendTimer
};
class SendTimer : public TimerHandler {
public:
SendTimer(BroadcastbaseAgent* t) : TimerHandler(), t_(t) {}
inline virtual void expire(Event*);
protected:
BroadcastbaseAgent* t_;
};
自己定义的广播包结构放在自己定义的文件里面,后面需要修改NS源码里面的部分文件,比如:~/ns-2.*/common/packet.h, ~/ns-2.*/tcl/lib/ns-default.tcl, ns-packet.tcl,以及Makefile文件,再重新编译整个NS。