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/*
* ping.cc
* Copyright (C) 2000 by the University of Southern California
* $Id: ping.cc,v 1.8 2005/08/25 18:58:01 johnh Exp $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
*
* The copyright of this module includes the following
* linking-with-specific-other-licenses addition:
*
* In addition, as a special exception, the copyright holders of
* this module give you permission to combine (via static or
* dynamic linking) this module 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 module 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 module
* 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.
*
*/
// $Header: /cvsroot/nsnam/ns-2/apps/ping.cc,v 1.8 2005/08/25 18:58:01 johnh Exp $
/*
* File: Code for a new 'Ping' Agent Class for the ns
* network simulator
* Author: Marc Greis (greis@cs.uni-bonn.de), May 1998
*
* IMPORTANT: Incase of any changes made to this file ,
* tutorial/examples/ping.cc file (used in Greis' tutorial) should
* be updated as well.
*/
#include "ping.h"
int hdr_ping::offset_;
static class PingHeaderClass : public PacketHeaderClass {
public:
PingHeaderClass() : PacketHeaderClass("PacketHeader/Ping",
sizeof(hdr_ping)) {
bind_offset(&hdr_ping::offset_);
}
} class_pinghdr;
static class PingClass : public TclClass {
public:
PingClass() : TclClass("Agent/Ping") {}
TclObject* create(int, const char*const*) {
return (new PingAgent());
}
} class_ping;
PingAgent::PingAgent() : Agent(PT_PING), seq(0), oneway(0)
{
bind("packetSize_", &size_);
}
int PingAgent::command(int argc, const char*const* argv)
{
if (argc == 2) {
if (strcmp(argv[1], "send") == 0) {
// Create a new packet
Packet* pkt = allocpkt();
// Access the Ping header for the new packet:
hdr_ping* hdr = hdr_ping::access(pkt);
// Set the 'ret' field to 0, so the receiving node
// knows that it has to generate an echo packet
hdr->ret = 0;
hdr->seq = seq++;
// Store the current time in the 'send_time' field
hdr->send_time = Scheduler::instance().clock();
// Send the packet
send(pkt, 0);
// return TCL_OK, so the calling function knows that
// the command has been processed
return (TCL_OK);
}
else if (strcmp(argv[1], "start-WL-brdcast") == 0) {
Packet* pkt = allocpkt();
hdr_ip* iph = HDR_IP(pkt);
hdr_ping* ph = hdr_ping::access(pkt);
iph->daddr() = IP_BROADCAST;
iph->dport() = iph->sport();
ph->ret = 0;
send(pkt, (Handler*) 0);
return (TCL_OK);
}
else if (strcmp(argv[1], "oneway") == 0) {
oneway=1;
return (TCL_OK);
}
}
// If the command hasn't been processed by PingAgent()::command,
// call the command() function for the base class
return (Agent::command(argc, argv));
}
void PingAgent::recv(Packet* pkt, Handler*)
{
// Access the IP header for the received packet:
hdr_ip* hdrip = hdr_ip::access(pkt);
// Access the Ping header for the received packet:
hdr_ping* hdr = hdr_ping::access(pkt);
// check if in brdcast mode
if ((u_int32_t)hdrip->daddr() == IP_BROADCAST) {
if (hdr->ret == 0) {
printf("Recv BRDCAST Ping REQ : at %d.%d from %d.%d\n", here_.addr_, here_.port_, hdrip->saddr(), hdrip->sport());
Packet::free(pkt);
// create reply
Packet* pktret = allocpkt();
hdr_ping* hdrret = hdr_ping::access(pktret);
hdr_ip* ipret = hdr_ip::access(pktret);
hdrret->ret = 1;
// add brdcast address
ipret->daddr() = IP_BROADCAST;
ipret->dport() = ipret->sport();
send(pktret, 0);
} else {
printf("Recv BRDCAST Ping REPLY : at %d.%d from %d.%d\n", here_.addr_, here_.port_, hdrip->saddr(), hdrip->sport());
Packet::free(pkt);
}
return;
}
// Is the 'ret' field = 0 (i.e. the receiving node is being pinged)?
if (hdr->ret == 0) {
// Send an 'echo'. First save the old packet's send_time
double stime = hdr->send_time;
int rcv_seq = hdr->seq;
// Discard the packet
Packet::free(pkt);
// Create a new packet
Packet* pktret = allocpkt();
// Access the Ping header for the new packet:
hdr_ping* hdrret = hdr_ping::access(pktret);
// Set the 'ret' field to 1, so the receiver won't send
// another echo
hdrret->ret = 1;
// Set the send_time field to the correct value
hdrret->send_time = stime;
// Added by Andrei Gurtov for one-way delay measurement.
hdrret->rcv_time = Scheduler::instance().clock();
hdrret->seq = rcv_seq;
// Send the packet
send(pktret, 0);
} else {
// A packet was received. Use tcl.eval to call the Tcl
// interpreter with the ping results.
// Note: In the Tcl code, a procedure
// 'Agent/Ping recv {from rtt}' has to be defined which
// allows the user to react to the ping result.
char out[100];
// Prepare the output to the Tcl interpreter. Calculate the
// round trip time
if (oneway) //AG
sprintf(out, "%s recv %d %d %3.1f %3.1f", name(),
hdrip->src_.addr_ >> Address::instance().NodeShift_[1],
hdr->seq, (hdr->rcv_time - hdr->send_time) * 1000,
(Scheduler::instance().clock()-hdr->rcv_time) * 1000);
else sprintf(out, "%s recv %d %3.1f", name(),
hdrip->src_.addr_ >> Address::instance().NodeShift_[1],
(Scheduler::instance().clock()-hdr->send_time) * 1000);
Tcl& tcl = Tcl::instance();
tcl.eval(out);
// Discard the packet
Packet::free(pkt);
}
}
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