dhcp4_srv.cc 4.54 KB
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// Copyright (C) 2011  Internet Systems Consortium, Inc. ("ISC")
//
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
// REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
// AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
// INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
// LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
// OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
// PERFORMANCE OF THIS SOFTWARE.

#include <dhcp/dhcp4.h>
#include <dhcp/pkt4.h>
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#include <dhcp/iface_mgr.h>
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#include <dhcp4/dhcp4_srv.h>
#include <asiolink/io_address.h>

using namespace std;
using namespace isc;
using namespace isc::dhcp;
using namespace isc::asiolink;

Dhcpv4Srv::Dhcpv4Srv() {
    cout << "Initialization" << endl;

    // first call to instance() will create IfaceMgr (it's a singleton)
    // it may throw something if things go wrong
    IfaceMgr::instance();

    /// @todo: instantiate LeaseMgr here once it is imlpemented.

    setServerID();

    shutdown = false;
}

Dhcpv4Srv::~Dhcpv4Srv() {
    cout << "DHCPv4 server shutdown." << endl;
}

bool
Dhcpv4Srv::run() {
    while (!shutdown) {
        boost::shared_ptr<Pkt4> query; // client's message
        boost::shared_ptr<Pkt4> rsp;   // server's response

#if 0
        query = IfaceMgr::instance().receive4();
#endif

        if (query) {
            if (!query->unpack()) {
                cout << "Failed to parse incoming packet" << endl;
                continue;
            }
            switch (query->getType()) {
            case DHCPDISCOVER:
                rsp = processDiscover(query);
                break;
            case DHCPREQUEST:
                rsp = processRequest(query);
                break;
            case DHCPRELEASE:
                processRelease(query);
                break;
            case DHCPDECLINE:
                processDecline(query);
                break;
            case DHCPINFORM:
                processInform(query);
                break;
            default:
                cout << "Unknown pkt type received:"
                     << query->getType() << endl;
            }

            cout << "Received " << query->len() << " bytes packet type="
                 << query->getType() << endl;

            /// DEBUG
            cout << query->toText();

            if (rsp) {
#if 0
                rsp->remote_addr_ = query->remote_addr_;
                rsp->local_addr_ = query->local_addr_;
                rsp->remote_port_ = DHCP6_CLIENT_PORT;
                rsp->local_port_ = DHCP6_SERVER_PORT;
                rsp->ifindex_ = query->ifindex_;
                rsp->iface_ = query->iface_;
#endif
                cout << "Replying with:" << rsp->getType() << endl;
                cout << rsp->toText();
                cout << "----" << endl;
                if (rsp->pack()) {
                    cout << "#### pack successful." << endl;
                }
#if 0
                IfaceMgr::instance().send4(rsp);
#endif
            }
        }

        // TODO add support for config session (see src/bin/auth/main.cc)
        //      so this daemon can be controlled from bob
    }

    return (true);
}

void
Dhcpv4Srv::setServerID() {
    /// TODO implement this for real once interface detection is done.
    /// Use hardcoded server-id for now
#if 0
    IOAddress srvId("127.0.0.1");
    serverid_ = boost::shared_ptr<Option>(
      new Option4AddrLst(Option::V4, DHO_DHCP_SERVER_IDENTIFIER, srvId));
#endif
}

boost::shared_ptr<Pkt4>
Dhcpv4Srv::processDiscover(boost::shared_ptr<Pkt4> discover) {
    /// TODO: Echo mode. Implement this for real
    return (discover);
}

boost::shared_ptr<Pkt4>
Dhcpv4Srv::processRequest(boost::shared_ptr<Pkt4> request) {
    /// TODO: Echo mode. Implement this for real
    return (request);
}

void Dhcpv4Srv::processRelease(boost::shared_ptr<Pkt4> release) {
    /// TODO: Implement this.
    cout << "Received RELEASE on " << release->getIface() << " interface." << endl;
}
 
void Dhcpv4Srv::processDecline(boost::shared_ptr<Pkt4> decline) {
    /// TODO: Implement this.
    cout << "Received DECLINE on " << decline->getIface() << " interface." << endl;
}

boost::shared_ptr<Pkt4> processInform(boost::shared_ptr<Pkt4> inform) {
    /// TODO: Echo mode. Implement this for real
    return (inform);
}