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/*
* Copyright (c) Xerox Corporation 1998. 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.
*
* $Header: /cvsroot/nsnam/ns-2/webcache/tcp-simple.cc,v 1.10 2005/08/26 05:05:31 tomh Exp $
*
*/
//
// SimpleTcp: Only share the same interface as FullTcp.
// It's inherited from FullTcp solely for interface reason... :(
//
// If we have interface declaration independent from class type definition,
// we'll be better off.
//
#include <stdlib.h>
#include "tclcl.h"
#include "packet.h"
#include "ip.h"
#include "app.h"
#include "tcp-simple.h"
static class SimpleTcpClass : public TclClass {
public:
SimpleTcpClass() : TclClass("Agent/TCP/SimpleTcp") {}
TclObject* create(int, const char*const*) {
return (new SimpleTcpAgent());
}
} class_simple_tcp_agent;
SimpleTcpAgent::SimpleTcpAgent() : TcpAgent(), seqno_(0)
{
}
// XXX Do *NOT* support infinite send of TCP (bytes == -1).
void SimpleTcpAgent::sendmsg(int bytes, const char* /*flags*/)
{
if (bytes == -1) {
fprintf(stderr,
"SimpleTcp doesn't support infinite send. Do not use FTP::start(), etc.\n");
return;
}
// Simply sending out bytes out to target_
curseq_ += bytes;
seqno_ ++;
Packet *p = allocpkt();
hdr_tcp *tcph = HDR_TCP(p);
tcph->seqno() = seqno_;
tcph->ts() = Scheduler::instance().clock();
tcph->ts_echo() = ts_peer_;
hdr_cmn *th = HDR_CMN(p);
th->size() = bytes + tcpip_base_hdr_size_;
send(p, 0);
}
void SimpleTcpAgent::recv(Packet *pkt, Handler *)
{
hdr_cmn *th = HDR_CMN(pkt);
int datalen = th->size() - tcpip_base_hdr_size_;
if (app_)
app_->recv(datalen);
// No lastbyte_ callback, because no packet fragmentation.
Packet::free(pkt);
}
int SimpleTcpAgent::command(int argc, const char*const* argv)
{
// Copy FullTcp's tcl interface
if (argc == 2) {
if (strcmp(argv[1], "listen") == 0) {
// Do nothing
return (TCL_OK);
}
if (strcmp(argv[1], "close") == 0) {
// Call done{} to match tcp-full's syntax
Tcl::instance().evalf("%s done", name());
return (TCL_OK);
}
}
return (TcpAgent::command(argc, argv));
}
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