bgp/peer-acceptor/src/main/java/org/opendaylight/protocol/bgp/peer/acceptor/BGPPeerAcceptorImpl.java

   1 /*
   2  * Copyright (c) 2016 Cisco Systems, Inc. and others.  All rights reserved.
   3  *
   4  * This program and the accompanying materials are made available under the
   5  * terms of the Eclipse Public License v1.0 which accompanies this distribution,
   6  * and is available at http://www.eclipse.org/legal/epl-v10.html
   7  */
   8
   9 package org.opendaylight.protocol.bgp.peer.acceptor;
  10
  11 import static java.util.Objects.requireNonNull;
  12
  13 import com.google.common.base.Preconditions;
  14 import io.netty.channel.Channel;
  15 import io.netty.channel.ChannelConfig;
  16 import io.netty.channel.ChannelFuture;
  17 import io.netty.channel.epoll.Epoll;
  18 import io.netty.channel.epoll.EpollChannelOption;
  19 import io.netty.util.internal.PlatformDependent;
  20 import java.net.InetAddress;
  21 import java.net.InetSocketAddress;
  22 import java.net.UnknownHostException;
  23 import java.security.AccessControlException;
  24 import javax.annotation.Nonnull;
  25 import org.opendaylight.protocol.bgp.rib.impl.spi.BGPDispatcher;
  26 import org.opendaylight.protocol.bgp.rib.impl.spi.BGPSessionPreferences;
  27 import org.opendaylight.protocol.bgp.rib.impl.spi.PeerRegistryListener;
  28 import org.opendaylight.protocol.concepts.KeyMapping;
  29 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IetfInetUtil;
  30 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.IpAddress;
  31 import org.opendaylight.yang.gen.v1.urn.ietf.params.xml.ns.yang.ietf.inet.types.rev130715.PortNumber;
  32 import org.slf4j.Logger;
  33 import org.slf4j.LoggerFactory;
  34
  35 public final class BGPPeerAcceptorImpl implements AutoCloseable {
  36     private static final Logger LOG = LoggerFactory.getLogger(BGPPeerAcceptorImpl.class);
  37     private static final int PRIVILEGED_PORTS = 1024;
  38     private final BGPDispatcher bgpDispatcher;
  39     private final InetSocketAddress address;
  40     private ChannelFuture futureChannel;
  41     private AutoCloseable listenerRegistration;
  42
  43     public BGPPeerAcceptorImpl(final IpAddress bindingAddress, final PortNumber portNumber,
  44             final BGPDispatcher bgpDispatcher) {
  45         this.bgpDispatcher = requireNonNull(bgpDispatcher);
  46         this.address = getAddress(requireNonNull(bindingAddress), requireNonNull(portNumber));
  47         if (!PlatformDependent.isWindows() && !PlatformDependent.maybeSuperUser()
  48                 && portNumber.getValue() < PRIVILEGED_PORTS) {
  49             throw new AccessControlException("Unable to bind port " + portNumber.getValue()
  50                     + " while running as non-root user.");
  51         }
  52     }
  53
  54     public void start() {
  55         LOG.debug("Instantiating BGP Peer Acceptor : {}", this.address);
  56
  57         this.futureChannel = this.bgpDispatcher.createServer(this.address);
  58         // Validate future success
  59         this.futureChannel.addListener(future -> {
  60             Preconditions.checkArgument(future.isSuccess(), "Unable to start bgp server on %s",
  61                 this.address, future.cause());
  62             final Channel channel = this.futureChannel.channel();
  63             if (Epoll.isAvailable()) {
  64                 this.listenerRegistration = this.bgpDispatcher.getBGPPeerRegistry().registerPeerRegisterListener(
  65                     new BGPPeerAcceptorImpl.PeerRegistryListenerImpl(channel.config()));
  66             }
  67         });
  68     }
  69
  70     private static InetSocketAddress getAddress(final IpAddress ipAddress, final PortNumber portNumber) {
  71         final InetAddress inetAddr;
  72         try {
  73             inetAddr = InetAddress.getByName(ipAddress.getIpv4Address() != null
  74                     ? ipAddress.getIpv4Address().getValue() : ipAddress.getIpv6Address().getValue());
  75         } catch (final UnknownHostException e) {
  76             throw new IllegalArgumentException("Illegal binding address " + ipAddress, e);
  77         }
  78         return new InetSocketAddress(inetAddr, portNumber.getValue());
  79     }
  80
  81     /**
  82      * This closes the acceptor and no new bgp connections will be accepted
  83      * Connections already established will be preserved.
  84      **/
  85     @Override
  86     public void close() throws Exception {
  87         this.futureChannel.cancel(true);
  88         this.futureChannel.channel().close();
  89         if (this.listenerRegistration != null) {
  90             this.listenerRegistration.close();
  91         }
  92     }
  93
  94     private static final class PeerRegistryListenerImpl implements PeerRegistryListener {
  95         private final ChannelConfig channelConfig;
  96         private final KeyMapping keys;
  97
  98         PeerRegistryListenerImpl(final ChannelConfig channelConfig) {
  99             this.channelConfig = channelConfig;
 100             this.keys = KeyMapping.getKeyMapping();
 101         }
 102
 103         @Override
 104         public void onPeerAdded(@Nonnull final IpAddress ip, @Nonnull final BGPSessionPreferences prefs) {
 105             if (prefs.getMd5Password().isPresent()) {
 106                 this.keys.put(IetfInetUtil.INSTANCE.inetAddressFor(ip), prefs.getMd5Password().get());
 107                 this.channelConfig.setOption(EpollChannelOption.TCP_MD5SIG, this.keys);
 108             }
 109         }
 110
 111         @Override
 112         public void onPeerRemoved(@Nonnull final IpAddress ip) {
 113             if (this.keys.remove(IetfInetUtil.INSTANCE.inetAddressFor(ip)) != null) {
 114                 this.channelConfig.setOption(EpollChannelOption.TCP_MD5SIG, this.keys);
 115             }
 116         }
 117     }
 118 }