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/*
* Copyright (c) 1993-1995 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 University of
* California, Berkeley and the Network Research Group at
* Lawrence Berkeley 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.
*/
static const char rcsid[] =
"@(#) $Header: /cs/research/mice/starship/src/local/CVS_repository/vic/confbus.cc,v 1.3 1999/01/08 11:25:42 ucackha Exp $ (LBL)";
#include <stdlib.h>
#include <ctype.h>
#include "config.h"
#include "inet.h"
#include "group-ipc.h"
#include "Tcl.h"
class ConfBus : public TclObject, public IPCHandler {
public:
ConfBus(int channel);
~ConfBus();
void ipc_input(int type, int frompid, u_char* p, int len);
protected:
int command(int argc, const char*const* argv);
GroupIPC* ipc_;
char* callback_;
int value1, value2;
};
static class ConfBusMatcher : public Matcher {
public:
ConfBusMatcher() : Matcher("confbus") { }
TclObject* match(const char* channel) {
return (new ConfBus(atoi(channel)));
}
} confbus;
ConfBus::ConfBus(int channel)
: TclObject(0), IPCHandler(~0), ipc_(0)
{
value1=0;
value2=0;
callback_ = 0;
ipc_ = new GroupIPC(channel);
ipc_->attach(this);
}
ConfBus::~ConfBus()
{
delete ipc_;
delete callback_;
}
void ConfBus::ipc_input(int, int, u_char* msg, int cc)
{
int value1, value2;
if (cc <= 0 || callback_ == 0)
return;
if (cc == 4) {
/*
* XXX backward compatibility with vat-3 voice-switching
* messages (i.e., pre-RTPv2 protocol). If the message
* is four bytes, then it must be the binary coded IP address
* of the site who's audio channel became active. Otherwise,
* it must be an new-style ascii conference bus command.
* Note an ascii command is necessarily larger than
* four bytes.
*/
u_int32_t addr = *(u_int32_t*)msg;
sprintf((char*)msg, "focus %s", InetNtoa(addr));
}
/* if this is a power message then compare it with the last
message and if the value is not significantly different then return */
if (sscanf((char*)msg, "relate_power %*s %d",&value1)!=0) {
if (value1>0) {
if (value1<value2) {
if (value1+10>=value2) return;
} else
if (value1-10<=value2) return;
value2=value1;
}
}
Tcl& tcl = Tcl::instance();
/*
* make sure message is null terminated and check that
* it's regular text that tcl can handle.
*/
int last = cc - 1;
if (msg[last] != 0)
return;
for (int i = 0; i < last; ++i) {
if (!isascii(msg[i]) && !isprint(msg[i]))
return;
}
tcl.evalf("%s %s {%s}", callback_, name(), (char*)msg);
}
/*
* $bus write $type $msg
* $bus handler $proc
*/
int ConfBus::command(int argc, const char*const* argv)
{
if (argc == 3) {
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) {
/*XXX*/
ipc_->send(0, argv[2]);
return (TCL_OK);
}
}
return (TclObject::command(argc, argv));
}
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