io.netty.handler.pcap.PcapWriter Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of wildfly-client-all

This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

The newest version!

/*
 * Copyright 2020 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */
package io.netty.handler.pcap;

import io.netty.buffer.ByteBuf;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;

import java.io.Closeable;
import java.io.IOException;
import java.io.OutputStream;

final class PcapWriter implements Closeable {

    /**
     * Logger
     */
    private static final InternalLogger logger = InternalLoggerFactory.getInstance(PcapWriter.class);

    private final PcapWriteHandler pcapWriteHandler;

    /**
     * Reference declared so that we can use this as mutex in clean way.
     */
    private final OutputStream outputStream;

    /**
     * This uses {@link OutputStream} for writing Pcap data.
     *
     * @throws IOException If {@link OutputStream#write(byte[])} throws an exception
     */
    PcapWriter(PcapWriteHandler pcapWriteHandler) throws IOException {
        this.pcapWriteHandler = pcapWriteHandler;
        outputStream = pcapWriteHandler.outputStream();

        // If OutputStream is not shared then we have to write Global Header.
        if (!pcapWriteHandler.sharedOutputStream()) {
            PcapHeaders.writeGlobalHeader(pcapWriteHandler.outputStream());
        }
    }

    /**
     * Write Packet in Pcap OutputStream.
     *
     * @param packetHeaderBuf Packer Header {@link ByteBuf}
     * @param packet          Packet
     * @throws IOException If {@link OutputStream#write(byte[])} throws an exception
     */
    void writePacket(ByteBuf packetHeaderBuf, ByteBuf packet) throws IOException {
        if (pcapWriteHandler.state() == State.CLOSED) {
            logger.debug("Pcap Write attempted on closed PcapWriter");
        }

        long timestamp = System.currentTimeMillis();

        PcapHeaders.writePacketHeader(
                packetHeaderBuf,
                (int) (timestamp / 1000L),
                (int) (timestamp % 1000L * 1000L),
                packet.readableBytes(),
                packet.readableBytes()
        );

        if (pcapWriteHandler.sharedOutputStream()) {
            synchronized (outputStream) {
                packetHeaderBuf.readBytes(outputStream, packetHeaderBuf.readableBytes());
                packet.readBytes(outputStream, packet.readableBytes());
            }
        } else {
            packetHeaderBuf.readBytes(outputStream, packetHeaderBuf.readableBytes());
            packet.readBytes(outputStream, packet.readableBytes());
        }
    }

    @Override
    public String toString() {
        return "PcapWriter{" +
                "outputStream=" + outputStream +
                '}';
    }

    @Override
    public void close() throws IOException {
        if (pcapWriteHandler.state() == State.CLOSED) {
            logger.debug("PcapWriter is already closed");
        } else {
            if (pcapWriteHandler.sharedOutputStream()) {
                synchronized (outputStream) {
                    outputStream.flush();
                }
            } else {
                outputStream.flush();
                outputStream.close();
            }
            pcapWriteHandler.markClosed();
            logger.debug("PcapWriter is now closed");
        }
    }
}