text: /* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
  /*
   * Copyright (c) 1996-1997 Regents of the University of California.
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright
   *    notice, this list of conditions and the following disclaimer in the
   *    documentation and/or other materials provided with the distribution.
   * 3. All advertising materials mentioning features or use of this software
   *    must display the following acknowledgement:
   * 	This product includes software developed by the MASH Research
   * 	Group at the University of California Berkeley.
   * 4. Neither the name of the University nor of the Research Group may be
   *    used to endorse or promote products derived from this software without
   *    specific prior written permission.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   */
  
  #ifndef lint
  static const char rcsid[] =
      "@(#) $Header: /cvsroot/nsnam/ns-2/classifier/classifier-virtual.cc,v 1.14 2010/03/08 05:54:49 tom_henderson Exp $";
  #endif
  
  extern "C" {
  #include <tcl.h>
  }
  #include "config.h"
  #include "packet.h"
  #include "ip.h"
  #include "classifier.h"
  #include "route.h"
  #include "object.h"
  #include "address.h"
  
  class VirtualClassifier : public Classifier {
  public:
  	VirtualClassifier() : routelogic_(0) {
  		Tcl_InitHashTable(&ht_, TCL_ONE_WORD_KEYS);
  	}
  	~VirtualClassifier() {
  		Tcl_DeleteHashTable(&ht_);
  	}
  	//virtual void do_install(char *dst, NsObject *target) { }
  	virtual void do_install(char *, NsObject *) { }
  protected:
  	NsObject* next_;
  	Tcl_HashTable ht_;
  	RouteLogic *routelogic_;
  	NsObject* target_;
  	bool enableHrouting_;
  	char nodeaddr_[SMALL_LEN];
  
  	int classify(Packet *const p) {
  		hdr_ip* iph = hdr_ip::access(p);
  		return mshift(iph->daddr());
  	}
  	
  	void recv(Packet* p, Handler* h) {
  		if (!routelogic_) {
  			Tcl &tcl = Tcl::instance();
  			tcl.evalc("[Simulator instance] get-routelogic");
  			routelogic_= (RouteLogic*) TclObject::lookup(tcl.result());
  			//tcl.evalf("%s info class", tcl.result());
  		}
  		/* first we find the next hop by asking routelogic
  		 * then we use a hash next_hop -> target_object
  		 * thus, the size of the table is at most N-1
  		 */
  		Tcl &tcl = Tcl::instance();
  		hdr_ip* iph = hdr_ip::access(p);
  		char* adst= Address::instance().print_nodeaddr(iph->daddr());
  		//adst[strlen(adst)-1]= 0;
  		target_= 0;
  
  		int next_hopIP;
  		routelogic_->lookup_flat(nodeaddr_, adst, next_hopIP);
  		delete [] adst;
  
  		int newEntry;
  		long key = next_hopIP;
  		Tcl_HashEntry *ep= Tcl_CreateHashEntry(&ht_, (const char*)key, 
  						       &newEntry); 
  		if (newEntry) {
  			tcl.evalf("%s find %d", name(), next_hopIP);
  			Tcl_SetHashValue(ep, target_= (NsObject*)tcl.lookup(tcl.result()));
  		} else {
  			target_= (NsObject*)Tcl_GetHashValue(ep);
  		}
  		
  		if (!target_) {
  			/*
  			 * XXX this should be "dropped" somehow.  Right now,
  			 * these events aren't traced.
  			 */
  			Packet::free(p);
  			return;
  		}
  		target_->recv(p,h);
  	}
  	int command(int argc, const char*const* argv) {
  		if (argc == 3) {
  			if (strcmp(argv[1], "nodeaddr") == 0) {
  				strcpy(nodeaddr_, argv[2]);
  				return(TCL_OK);
  			}
  		}
  		return (NsObject::command(argc, argv));
  	}
  };
  
  static class VirtualClassifierClass : public TclClass {
  public:
  	VirtualClassifierClass() : TclClass("Classifier/Virtual") {}
  	TclObject* create(int, const char*const*) {
  		return (new VirtualClassifier());
  	}
  } class_virtual_classifier;
  
  