bi-connector.cc

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/* -*-  Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
 * Copyright (c) 1997 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 MASH Research
 *  Group at the University of California Berkeley.
 * 4. Neither the name of the University nor of the Research Group 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
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */


#include "packet.h"
#include "bi-connector.h"

static class BiConnectorClass : public TclClass {
public:
    BiConnectorClass() : TclClass("BiConnector") {}
    TclObject* create(int, const char*const*) {
        return (new BiConnector);
    }
} class_biconnector;

BiConnector::BiConnector() : uptarget_(0), downtarget_(0), drop_(0)
{}


int BiConnector::command(int argc, const char*const* argv)
{
    Tcl& tcl = Tcl::instance();
    /*XXX*/
    if (argc == 2) {
        if (strcmp(argv[1], "up-target") == 0) {
            if (uptarget_ != 0)
                tcl.result(uptarget_->name());
            return (TCL_OK);
        }
        if (strcmp(argv[1], "down-target") == 0) {
            if (downtarget_ != 0)
                tcl.result(downtarget_->name());
            return (TCL_OK);
        }
        if (strcmp(argv[1], "drop-target") == 0) {
            if (drop_ != 0)
                tcl.resultf("%s", drop_->name());
            return (TCL_OK);
        }
        if (strcmp(argv[1], "isDynamic") == 0) {
            return TCL_OK;
        }
    }

    else if (argc == 3) {
        TclObject *obj;
        
        if( (obj = TclObject::lookup(argv[2])) == 0) {
            fprintf(stderr, "%s lookup failed\n", argv[1]);
            return TCL_ERROR;
        }
        if (strcmp(argv[1], "up-target") == 0) {
            if (*argv[2] == '0') {
                uptarget_ = 0;
                return (TCL_OK);
            }
            uptarget_ = (NsObject*) obj;
            if (uptarget_ == 0) {
                tcl.resultf("no such object %s", argv[2]);
                return (TCL_ERROR);
            }
            return (TCL_OK);
        }
        if (strcmp(argv[1], "down-target") == 0) {
            if (*argv[2] == '0') {
                downtarget_ = 0;
                return (TCL_OK);
            }
            downtarget_ = (NsObject*) obj;
            if (downtarget_ == 0) {
                tcl.resultf("no such object %s", argv[2]);
                return (TCL_ERROR);
            }
            return (TCL_OK);
        }
        if (strcmp(argv[1], "drop-target") == 0) {
            drop_ = (NsObject*) obj;
            if (drop_ == 0) {
                tcl.resultf("no object %s", argv[2]);
                return (TCL_ERROR);
            }
            return (TCL_OK);
        }
    }
    return (NsObject::command(argc, argv));
}

void BiConnector::recv(Packet* p, Handler* h)
{
    hdr_cmn *ch = HDR_CMN(p);
    switch (ch->direction()) {
    case hdr_cmn::UP :
        sendUp(p, h);
        break;
    case hdr_cmn::DOWN :
        sendDown(p, h);
        break;
    default:
        printf("Error: Packet Direction not specified; Using default 'UP' direction\n\n");
        sendUp(p, h);
    }
}

void BiConnector::drop(Packet* p)
{
    if (drop_ != 0)
        drop_->recv(p);
    else
        Packet::free(p);
}


void BiConnector::drop(Packet* p, const char *s)
{
    if (drop_ != 0)
        drop_->recv(p, s);
    else
        Packet::free(p);
}

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