completeUDPWrite() — netty Function Reference

Architecture documentation for the completeUDPWrite() function in PcapWriteHandler.java from the netty codebase.

Function java Buffer Allocators called by 1

Entity Profile

Buffer→ Allocators→ completeUDPWrite() — netty Function Reference

Dependency Diagram

graph TD
  4e4d1dfd_9ca2_974c_7198_72a58937e36e["completeUDPWrite()"]
  59f0289b_ecfd_de3c_3397_4cf08e2047d1["PcapWriteHandler"]
  4e4d1dfd_9ca2_974c_7198_72a58937e36e -->|defined in| 59f0289b_ecfd_de3c_3397_4cf08e2047d1
  06ef8177_bf66_5538_b798_56d322fe8d3e["handleUDP()"]
  06ef8177_bf66_5538_b798_56d322fe8d3e -->|calls| 4e4d1dfd_9ca2_974c_7198_72a58937e36e
  style 4e4d1dfd_9ca2_974c_7198_72a58937e36e fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

handler/src/main/java/io/netty/handler/pcap/PcapWriteHandler.java lines 556–592

    private void completeUDPWrite(InetSocketAddress srcAddr, InetSocketAddress dstAddr, ByteBuf udpBuf,
                                  ByteBufAllocator byteBufAllocator, ChannelHandlerContext ctx) {

        ByteBuf ipBuf = byteBufAllocator.buffer();
        ByteBuf ethernetBuf = byteBufAllocator.buffer();
        ByteBuf pcap = byteBufAllocator.buffer();

        try {
            if (srcAddr.getAddress() instanceof Inet4Address && dstAddr.getAddress() instanceof Inet4Address) {
                IPPacket.writeUDPv4(ipBuf, udpBuf,
                                    NetUtil.ipv4AddressToInt((Inet4Address) srcAddr.getAddress()),
                                    NetUtil.ipv4AddressToInt((Inet4Address) dstAddr.getAddress()));

                EthernetPacket.writeIPv4(ethernetBuf, ipBuf);
            } else if (srcAddr.getAddress() instanceof Inet6Address && dstAddr.getAddress() instanceof Inet6Address) {
                IPPacket.writeUDPv6(ipBuf, udpBuf,
                                    srcAddr.getAddress().getAddress(),
                                    dstAddr.getAddress().getAddress());

                EthernetPacket.writeIPv6(ethernetBuf, ipBuf);
            } else {
                logger.error("Source and Destination IP Address versions are not same. Source Address: {}, " +
                             "Destination Address: {}", srcAddr.getAddress(), dstAddr.getAddress());
                return;
            }

            // Write Packet into Pcap
            pCapWriter.writePacket(pcap, ethernetBuf);
        } catch (IOException ex) {
            logger.error("Caught Exception While Writing Packet into Pcap", ex);
            ctx.fireExceptionCaught(ex);
        } finally {
            ipBuf.release();
            ethernetBuf.release();
            pcap.release();
        }
    }