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/*
* Copyright (C) 2020 Graylog, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* .
*/
package org.graylog.plugins.netflow.v5;
import com.google.common.collect.ImmutableList;
import io.netty.buffer.ByteBuf;
import org.graylog.plugins.netflow.flows.CorruptFlowPacketException;
import org.graylog.plugins.netflow.flows.InvalidFlowVersionException;
import org.graylog.plugins.netflow.utils.ByteBufUtils;
import java.net.InetAddress;
public class NetFlowV5Parser {
private static final int HEADER_LENGTH = 24;
private static final int RECORD_LENGTH = 48;
public static NetFlowV5Packet parsePacket(ByteBuf bb) {
final int readableBytes = bb.readableBytes();
final NetFlowV5Header header = parseHeader(bb.slice(bb.readerIndex(), HEADER_LENGTH));
final int packetLength = HEADER_LENGTH + header.count() * RECORD_LENGTH;
if (header.count() <= 0 || readableBytes < packetLength) {
throw new CorruptFlowPacketException("Insufficient data (expected: " + packetLength + " bytes, actual: " + readableBytes + " bytes)");
}
final ImmutableList.Builder records = ImmutableList.builder();
int offset = HEADER_LENGTH;
for (int i = 0; i < header.count(); i++) {
records.add(parseRecord(bb.slice(offset + bb.readerIndex(), RECORD_LENGTH)));
offset += RECORD_LENGTH;
}
return NetFlowV5Packet.create(header, records.build(), offset);
}
/**
*
* | BYTES | CONTENTS | DESCRIPTION |
* |-------|-------------------|------------------------------------------------------------------------------------------|
* | 0-1 | version | NetFlow export format version number |
* | 2-3 | count | Number of flows exported in this packet (1-30) |
* | 4-7 | sys_uptime | Current time in milliseconds since the export device booted |
* | 8-11 | unix_secs | Current count of seconds since 0000 UTC 1970 |
* | 12-15 | unix_nsecs | Residual nanoseconds since 0000 UTC 1970 |
* | 16-19 | flow_sequence | Sequence counter of total flows seen |
* | 20 | engine_type | Type of flow-switching engine |
* | 21 | engine_id | Slot number of the flow-switching engine |
* | 22-23 | sampling_interval | First two bits hold the sampling mode; remaining 14 bits hold value of sampling interval |
*
*/
private static NetFlowV5Header parseHeader(ByteBuf bb) {
final int version = bb.readUnsignedShort();
if (version != 5) {
throw new InvalidFlowVersionException(version);
}
final int count = bb.readUnsignedShort();
final long sysUptime = bb.readUnsignedInt();
final long unixSecs = bb.readUnsignedInt();
final long unixNsecs = bb.readUnsignedInt();
final long flowSequence = bb.readUnsignedInt();
final short engineType = bb.readUnsignedByte();
final short engineId = bb.readUnsignedByte();
final short sampling = bb.readShort();
final int samplingMode = (sampling >> 14) & 3;
final int samplingInterval = sampling & 0x3fff;
return NetFlowV5Header.create(
version,
count,
sysUptime,
unixSecs,
unixNsecs,
flowSequence,
engineType,
engineId,
samplingMode,
samplingInterval);
}
/**
*
* | BYTES | CONTENTS | DESCRIPTION |
* |-------|-----------|--------------------------------------------------------------------|
* | 0-3 | srcaddr | Source IP address |
* | 4-7 | dstaddr | Destination IP address |
* | 8-11 | nexthop | IP address of next hop router |
* | 12-13 | input | SNMP index of input interface |
* | 14-15 | output | SNMP index of output interface |
* | 16-19 | dPkts | Packets in the flow |
* | 20-23 | dOctets | Total number of Layer 3 bytes in the packets of the flow |
* | 24-27 | first | SysUptime at start of flow |
* | 28-31 | last | SysUptime at the time the last packet of the flow was received |
* | 32-33 | srcport | TCP/UDP source port number or equivalent |
* | 34-35 | dstport | TCP/UDP destination port number or equivalent |
* | 36 | pad1 | Unused (zero) bytes |
* | 37 | tcp_flags | Cumulative OR of TCP flags |
* | 38 | prot | IP protocol type (for example, TCP = 6; UDP = 17) |
* | 39 | tos | IP type of service (ToS) |
* | 40-41 | src_as | Autonomous system number of the source, either origin or peer |
* | 42-43 | dst_as | Autonomous system number of the destination, either origin or peer |
* | 44 | src_mask | Source address prefix mask bits |
* | 45 | dst_mask | Destination address prefix mask bits |
* | 46-47 | pad2 | Unused (zero) bytes |
*
*/
private static NetFlowV5Record parseRecord(ByteBuf bb) {
final InetAddress srcAddr = ByteBufUtils.readInetAddress(bb);
final InetAddress dstAddr = ByteBufUtils.readInetAddress(bb);
final InetAddress nextHop = ByteBufUtils.readInetAddress(bb);
final int inputIface = bb.readUnsignedShort();
final int outputIface = bb.readUnsignedShort();
final long packetCount = bb.readUnsignedInt();
final long octetCount = bb.readUnsignedInt();
final long first = bb.readUnsignedInt();
final long last = bb.readUnsignedInt();
final int srcPort = bb.readUnsignedShort();
final int dstPort = bb.readUnsignedShort();
bb.readByte(); // unused pad1
final short tcpFlags = bb.readUnsignedByte();
final short protocol = bb.readUnsignedByte();
final short tos = bb.readUnsignedByte();
final int srcAs = bb.readUnsignedShort();
final int dstAs = bb.readUnsignedShort();
final short srcMask = bb.readUnsignedByte();
final short dstMask = bb.readUnsignedByte();
return NetFlowV5Record.create(srcAddr, dstAddr, nextHop, inputIface, outputIface, packetCount, octetCount, first, last, srcPort, dstPort, tcpFlags, protocol, tos, srcAs, dstAs, srcMask, dstMask);
}
}
