go-dnscollector

README

DNS-collector acts as a passive high speed ingestor with pipelining support for your DNS logs, written in Golang. It allows enhancing your DNS logs by adding metadata, extracting usage patterns, and facilitating security analysis.

Additionally, DNS-collector also support

• Extended DNStap with TLS encryption, compression, and more metadata capabilities
• DNS protocol conversions (to plain text, JSON, and more... )
• DNS parser with Extension Mechanisms for DNS (EDNS) support
• IPv4/v6 defragmentation and TCP reassembly
• Nanoseconds in timestamps

Features

• Pipelining

  The DNS traffic can be collected and aggregated from simultaneously sources like DNStap streams, network interface or log files and relays it to multiple other listeners

  

  You can also applied transformations on it like (traffic filtering, user privacy, ...).

  

• Collectors & Loggers

  • Listen for logging traffic with streaming network protocols
    • DNStap with tls|tcp|unix transports support and proxifier
    • PowerDNS streams with full support
    • DNSMessage to route DNS messages based on specific dns fields
    • TZSP protocol support
  • Live capture on a network interface
    • AF_PACKET socket with BPF filter
    • eBPF XDP ingress traffic
  • Read text or binary files as input
    • Read and tail on Plain text files
    • Ingest PCAP or DNSTap files by watching a directory
  • Local storage of your DNS logs in text or binary formats
    • Stdout console in text or binary output
    • File with automatic rotation and compression
  • Provide metrics and API
    • Prometheus exporter
    • Statsd support
    • REST API with swagger to search DNS domains
  • Send to remote host with generic transport protocol
    • Raw TCP client
    • Syslog with TLS support
    • DNSTap protobuf client
  • Send to various sinks
    • Fluentd
    • InfluxDB
    • Loki client
    • ElasticSearch
    • Scalyr
    • Redis publisher
    • Kafka producer
    • ClickHouse client
  • Send to security tools
    • Falco

• Transformers

  • Rewrite DNS messages or custom Relabeling for JSON output
  • Add additionnal Tags in DNS messages
  • Traffic Filtering and Reducer
  • Latency Computing
  • Apply User Privacy
  • Normalize DNS messages
  • Add Geographical metadata
  • Various data Extractor
  • Suspicious traffic Detector and Prediction

Get Started

Download the latest release binary and start the DNS-collector with the provided configuration file. The default configuration listens on tcp/6000 for a DNSTap stream and DNS logs are printed on standard output.

./go-dnscollector -config config.yml

If you prefer run it from docker, follow this guide.

Configuration

The configuration of DNS-collector is done through a file named config.yml. When the DNS-collector starts, it will look for the config.yml from the current working directory.

See the full configuration guide for more details.

Run the DNS-collector in dry mode to verify the configuration.

./go-dnscollector -config config.yml -test-config
INFO: 2023/12/24 14:43:29.043730 main - config OK!

Usage examples

The _examples folder from documentation contains a number of various configurations to get you started with the DNS-collector in different ways.

The _integration folder contains DNS-collector configuration files and docker compose examples for popular tools:

• Fluentd
• Elasticsearch
• Kafka
• InfluxDB
• Prometheus
• Loki

DNS Telemetry

DNS-collector provides telemetry capabilities with the Prometheus logger, you can easily monitor key performance indicators and detect anomalies in real-time.

Performance

Tuning may be necessary to deal with a large traffic loads. Please refer to the performance tuning guide if needed.

Performance metrics are available to evaluate the efficiency of your pipelines. These metrics allow you to track:

• The number of incoming and outgoing packets processed by each worker
• The number of packets matching the policies applied (forwarded, dropped)
• The number of "discarded" packets
• Memory consumption
• CPU consumption

A build-in dashboard is available for monitoring these metrics.

Contributing

See the development guide for more information on how to build it yourself.