modules/up/src/Core/network/Ping.cc
/* [<][>][^][v][top][bottom][index][help] */
FUNCTIONS
This source file includes following functions.
- pingTimerHandler
- Ping
- Ping
- send
- handleTimer
- receive
//
// $Id: Ping.cc,v 1.1.1.1 2000/03/10 16:32:19 engin Exp $
//
// Author(s): Ramesh Govindan
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "util/Types.hh"
#include "util/Trail.hh"
#include "util/Handler.hh"
#include "util/Buffer.hh"
#include "sys/File.hh"
#include "sys/Pipe.hh"
#include "sys/Time.hh"
#include "sched/Timer.hh"
#include "sched/Dispatcher.hh"
#include "network/Ping.hh"
#include "network/Headers.hh"
#include "network/Network.hh"
// Locals
static TraceCode tracePing("network");
static TimeShort maxWait(10, 0);
static unsigned int probeNumber = 1;
static void
pingTimerHandler(void* ptr,
/* [<][>][^][v][top][bottom][index][help] */
void*)
{
((Ping*) ptr)->handleTimer();
}
Ping::Ping(Address* a,
/* [<][>][^][v][top][bottom][index][help] */
Handler& cb)
: ListNode()
{
done = cb;
addr = *a;
timer = NULL;
network->pendingPings.append(this);
}
Ping::~Ping()
/* [<][>][^][v][top][bottom][index][help] */
{
if (timer) {
delete timer;
}
network->pendingPings.remove(this);
}
void
Ping::send()
/* [<][>][^][v][top][bottom][index][help] */
{
Handler th(pingTimerHandler, this);
Handler nh(NULL, NULL);
Buffer* buf;
IP* ip;
ICMP* icmp;
RawSocket* raw;
unsigned long* t;
TimeLong at;
raw = new RawSocket(nh, nh, RawSocketICMP);
buf = new Buffer(sizeof(IP) + sizeof(ICMP) + sizeof(unsigned long long));
buf->zeroFill();
ip = (IP*) buf->contents;
ip->headerLength = sizeof(IP) >> 2;
ip->version = 4;
ip->typeOfService = 0;
ip->totalLength = sizeof(IP) + sizeof(ICMP) + sizeof(unsigned long long);
ip->identifier = 0;
ip->fragmentOffset = 0;
ip->timeToLive = 0xff;
ip->protocol = IPPROTO_ICMP;
ip->source = (network->interfaces.head())->address.get();
ip->destination = addr.get();
ip->hton();
ip->checksum = 0;
ip->checksum = htons(network->cksum((U16*) ip, sizeof(IP)));
// We encode the sequence number and ident in the probe
sequence = probeNumber++;
icmp = (ICMP*) (ip + 1);
icmp->type = ICMPTypeEcho;
icmp->code = 0;
icmp->gateway = sequence;
icmp->hton();
dispatcher.systemClock.sync();
sent = dispatcher.systemClock;
icmp->checksum = 0;
icmp->checksum = network->cksum((U16*) icmp,
sizeof(ICMP) + sizeof(unsigned long long));
raw->sendTo(buf->contents, buf->size, addr, 0);
TRACE(tracePing, "ping sent to %s\n", addr.name());
delete raw;
delete buf;
if (timer) {
delete timer;
}
at = dispatcher.systemClock;
at = at + maxWait;
timer = new Timer(th, at);
return;
}
void
Ping::handleTimer()
/* [<][>][^][v][top][bottom][index][help] */
{
TRACE(tracePing, "ping failed to %s\n", addr.name());
timer = NULL;
lastRtt = InfiniteInterval;
done.callBack((void*) this);
return;
}
Boolean
Ping::receive(IP* ip)
/* [<][>][^][v][top][bottom][index][help] */
{
ICMP* icmp;
unsigned long* t;
icmp = (struct ICMP*) ((char*) ip + (ip->headerLength << 2));
// Verify signature to see if it is for us
if (icmp->type == ICMPTypeEchoReply) {
if (ip->source != addr.get()) {
return false;
}
if (icmp->gateway != sequence) {
return false;
}
TRACE(tracePing, "ping received from %s\n", addr.name());
t = (unsigned long *) (icmp+1);
dispatcher.systemClock.sync();
lastRtt = dispatcher.systemClock - sent;
done.callBack((void*) this);
return true;
}
return false;
}
// Copyright (c) 1994 by the University of Southern California.
// All rights reserved.
//
// Permission to use, copy, modify, and distribute this software and
// its documentation in source and binary forms for lawful
// non-commercial purposes and without fee is hereby granted, provided
// that the above copyright notice appear in all copies and that both
// the copyright notice and this permission notice appear in supporting
// documentation, and that any documentation, advertising materials,
// and other materials related to such distribution and use acknowledge
// that the software was developed by the University of Southern
// California and/or Information Sciences Institute.
// The name of the University of Southern California may not
// be used to endorse or promote products derived from this software
// without specific prior written permission.
//
// THE UNIVERSITY OF SOUTHERN CALIFORNIA DOES NOT MAKE ANY REPRESENTATIONS
// ABOUT THE SUITABILITY OF THIS SOFTWARE FOR ANY PURPOSE. THIS SOFTWARE IS
// PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND
// NON-INFRINGEMENT.
//
// IN NO EVENT SHALL USC, OR ANY OTHER CONTRIBUTOR BE LIABLE FOR ANY
// SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES, WHETHER IN CONTRACT,
// TORT, OR OTHER FORM OF ACTION, ARISING OUT OF OR IN CONNECTION WITH,
// THE USE OR PERFORMANCE OF THIS SOFTWARE.
//
// Questions concerning this software should be directed to
// scan@isi.edu.
//