/* -*-	Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- *//* * Copyright (C) Xerox Corporation 1997. All rights reserved. *   * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2 of the License, or (at your * option) any later version. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA * * Linking this file statically or dynamically with other modules is making * a combined work based on this file.  Thus, the terms and conditions of * the GNU General Public License cover the whole combination. * * In addition, as a special exception, the copyright holders of this file * give you permission to combine this file with free software programs or * libraries that are released under the GNU LGPL and with code included in * the standard release of ns-2 under the Apache 2.0 license or under * otherwise-compatible licenses with advertising requirements (or modified * versions of such code, with unchanged license).  You may copy and * distribute such a system following the terms of the GNU GPL for this * file and the licenses of the other code concerned, provided that you * include the source code of that other code when and as the GNU GPL * requires distribution of source code. * * Note that people who make modified versions of this file are not * obligated to grant this special exception for their modified versions; * it is their choice whether to do so.  The GNU General Public License * gives permission to release a modified version without this exception; * this exception also makes it possible to release a modified version * which carries forward this exception. */#ifndef lintstatic const char rcsid[] =    "@(#) $Header: /cvsroot/nsnam/ns-2/apps/udp.cc,v 1.21 2005/08/26 05:05:28 tomh Exp $ (Xerox)";#endif#include "udp.h"#include "rtp.h"#include "random.h"#include "address.h"#include "ip.h"// Dapengextern int global_flowid;extern int flow_to_tag[];static class UdpAgentClass : public TclClass {public:	UdpAgentClass() : TclClass("Agent/UDP") {}	TclObject* create(int, const char*const*) {		return (new UdpAgent());	}} class_udp_agent;UdpAgent::UdpAgent() : Agent(PT_UDP), seqno_(-1){	bind("packetSize_", &size_);	// Dapeng	global_flowid++;        flow_id = global_flowid;        flow_to_tag[flow_id] = -1;}UdpAgent::UdpAgent(packet_t type) : Agent(type){	bind("packetSize_", &size_);	global_flowid++;        flow_id = global_flowid;        flow_to_tag[flow_id] = -1;}// put in timestamp and sequence number, even though UDP doesn't usually // have one.void UdpAgent::sendmsg(int nbytes, AppData* data, const char* flags){	Packet *p;	int n;	assert (size_ > 0);	n = nbytes / size_;	if (nbytes == -1) {		printf("Error:  sendmsg() for UDP should not be -1\n");		return;	}		// If they are sending data, then it must fit within a single packet.	if (data && nbytes > size_) {		printf("Error: data greater than maximum UDP packet size\n");		return;	}	double local_time = Scheduler::instance().clock();	while (n-- > 0) {		p = allocpkt();		hdr_cmn::access(p)->size() = size_;		// Dapeng		hdr_cmn::access(p)->_flowid_ = flow_id;                hdr_cmn::access(p)->_tag_ = -1;		hdr_rtp* rh = hdr_rtp::access(p);		rh->flags() = 0;		rh->seqno() = ++seqno_;		hdr_cmn::access(p)->timestamp() = 		    (u_int32_t)(SAMPLERATE*local_time);		// add "beginning of talkspurt" labels (tcl/ex/test-rcvr.tcl)		if (flags && (0 ==strcmp(flags, "NEW_BURST")))			rh->flags() |= RTP_M;		p->setdata(data);		target_->recv(p);	}	n = nbytes % size_;	if (n > 0) {		p = allocpkt();		hdr_cmn::access(p)->size() = n;		// Dapeng		hdr_cmn::access(p)->_flowid_ = flow_id;                hdr_cmn::access(p)->_tag_ = -1;		hdr_rtp* rh = hdr_rtp::access(p);		rh->flags() = 0;		rh->seqno() = ++seqno_;		hdr_cmn::access(p)->timestamp() = 		    (u_int32_t)(SAMPLERATE*local_time);		// add "beginning of talkspurt" labels (tcl/ex/test-rcvr.tcl)		if (flags && (0 == strcmp(flags, "NEW_BURST")))			rh->flags() |= RTP_M;		p->setdata(data);		target_->recv(p);	}	idle();}void UdpAgent::recv(Packet* pkt, Handler*){	if (app_ ) {		// If an application is attached, pass the data to the app		hdr_cmn* h = hdr_cmn::access(pkt);		app_->process_data(h->size(), pkt->userdata());	} else if (pkt->userdata() && pkt->userdata()->type() == PACKET_DATA) {		// otherwise if it's just PacketData, pass it to Tcl		//		// Note that a Tcl procedure Agent/Udp recv {from data}		// needs to be defined.  For example,		//		// Agent/Udp instproc recv {from data} {puts data}		PacketData* data = (PacketData*)pkt->userdata();		hdr_ip* iph = hdr_ip::access(pkt);                Tcl& tcl = Tcl::instance();		tcl.evalf("%s process_data %d {%s}", name(),		          iph->src_.addr_ >> Address::instance().NodeShift_[1],			  data->data());	}	Packet::free(pkt);}int UdpAgent::command(int argc, const char*const* argv){	if (argc == 4) {		if (strcmp(argv[1], "send") == 0) {			PacketData* data = new PacketData(1 + strlen(argv[3]));			strcpy((char*)data->data(), argv[3]);			sendmsg(atoi(argv[2]), data);			return (TCL_OK);		}	} else if (argc == 5) {		if (strcmp(argv[1], "sendmsg") == 0) {			PacketData* data = new PacketData(1 + strlen(argv[3]));			strcpy((char*)data->data(), argv[3]);			sendmsg(atoi(argv[2]), data, argv[4]);			return (TCL_OK);		}	}	return (Agent::command(argc, argv));}