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/*
* Copyright (c) 1995 The 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 Network Research
* Group at Lawrence Berkeley National Laboratory.
* 4. Neither the name of the University nor of the Laboratory 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 char rcsid[] =
"@(#) $Header: /cs/research/mice/starship/src/local/CVS_repository/vic/communicator.cc,v 1.1.1.1 1998/02/18 18:03:19 ucacsva Exp $ (LBL)";
#endif
#include <ctype.h>
#include "config.h"
#include "iohandler.h"
#include "Tcl.h"
#include "net.h"
#include "rtp.h"
class Communicator : public TclObject, public IOHandler {
public:
Communicator();
~Communicator();
virtual int command(int argc, const char*const* argv);
virtual void dispatch(int mask);
protected:
void send(const char* s);
Network* net_;
char* callback_;
u_int16_t seqno_;
u_char* pktbuf_;
};
static class CommunicatorMatcher : public Matcher {
public:
CommunicatorMatcher() : Matcher("communicator") {}
TclObject* match(const char*) {
return (new Communicator);
}
} comm_matcher;
#define MTU 2048
Communicator::Communicator() : callback_(0), net_(0), seqno_(0)
{
pktbuf_ = new u_char[MTU];
}
Communicator::~Communicator()
{
delete callback_;
delete pktbuf_;
}
void Communicator::dispatch(int)
{
u_int32_t src;
int cc = net_->recv(pktbuf_, MTU, src);
if (cc <= 0 || callback_ == 0)
return;
char* p = (char*)pktbuf_;
cc -= sizeof(struct rtphdr);
p += sizeof(struct rtphdr);
int n = cc - 1;
if (p[n] != 0)
return;
for (int i = 0; i < n; ++i)
if (!isprint(p[i]))
return;
Tcl::instance().evalf("%s %s {%s}", callback_, name(), p);
}
int Communicator::command(int argc, const char*const* argv)
{
if (argc == 3) {
if (strcmp(argv[1], "network") == 0) {
if (net_ != 0)
unlink();
net_ = (Network*)TclObject::lookup(argv[2]);
if (net_ != 0)
link(net_->rchannel(), TK_READABLE);
return (TCL_OK);
}
if (strcmp(argv[1], "handler") == 0) {
const char* proc = argv[2];
delete callback_;
callback_ = new char[strlen(proc) + 1];
strcpy(callback_, proc);
return (TCL_OK);
}
if (strcmp(argv[1], "send") == 0) {
send(argv[2]);
return (TCL_OK);
}
}
return (TclObject::command(argc, argv));
}
inline u_int32_t tod90()
{
timeval t;
::gettimeofday(&t, 0);
u_int32_t u = t.tv_usec;
u = (u << 3) + u; /* x 9 */
/* sec * 90Khz + (usec * 90Khz) / 1e6 */
return (t.tv_sec * 90000 + (u / 100));
}
void Communicator::send(const char* s)
{
/* XXX use rtp */
rtphdr* rh = (rtphdr*)pktbuf_;
/*XXX fmt=133*/
int flags = RTP_VERSION << 14 | 133;
rh->rh_flags = ntohs(flags);
rh->rh_seqno = htons(seqno_);
++seqno_;
rh->rh_ssrc = 0;/*XXX*/
u_int32_t ts = tod90();
rh->rh_ts = htonl(ts);
strcpy((char*)(rh + 1), s);
net_->send(pktbuf_, sizeof(*rh) + strlen(s) + 1);
}
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