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Collector: Protobuf PowerDNS

Collector to logging protobuf streams from PowerDNS servers. The DNS-collector has a full Protobuf Logging support for PowerDNS's products.

Settings:

  • listen-ip (str)

    Set the local address that the server will bind to. If not provided, the server will bind to all available network interfaces (0.0.0.0).

  • listen-port (int)

    Set the local port that the server will listen on. If not provided, use the default port.

  • tls-support (bool)

    Enables or disables TLS (Transport Layer Security) support. If set to true, TLS will be used for secure communication.

  • tls-min-version (str)

    Specifies the minimum TLS version that the server will support.

  • cert-file (str)

    Specifies the path to the certificate file to be used for TLS. This is a required parameter if TLS support is enabled.

  • key-file(str)

    Specifies the path to the key file corresponding to the certificate file. This is a required parameter if TLS support is enabled.

  • sock-rcvbuf (int)

    This advanced parameter allows fine-tuning of network performance by adjusting the amount of data the socket can receive before signaling to the sender to slow down. Sets the socket receive buffer in bytes SO_RCVBUF. Set to zero to use the default system value.

  • reset-conn (bool)

    Set whether to send a TCP Reset to force the cleanup of the connection on the remote side when the server exits.

  • chan-buffer-size (int)

    Specifies the maximum number of packets that can be buffered before discard additional packets. Set to zero to use the default global value.

  • add-dns-payload (bool)

    PowerDNS protobuf message does not contain a DNS payload; use this setting to add a raw DNS payload.

Defaults:

- name: powerdns
  powerdns:
    listen-ip: 0.0.0.0
    listen-port: 6001
    tls-support: false
    tls-min-version: 1.2
    cert-file: ""
    key-file: ""
    reset-conn: true
    chan-buffer-size: 0
    add-dns-payload: false

Custom text format

If you logs your DNS traffic in basic text format, you can use the specific directives:

  • powerdns-tags[:INDEX]: get all tags separated by comma, or the tag according to the provided INDEX
  • powerdns-original-request-subnet: get original request subnet like edns subclient
  • powerdns-applied-policy: get applied policy
  • powerdns-applied-policy-hit: get applied policy hit
  • powerdns-applied-policy-kind: get applied policy kind
  • powerdns-applied-policy-trigger: get applied policy trigger
  • powerdns-applied-policy-type: get applied policy type
  • powerdns-metadata[:KEY]: get all metadata separated by comma or specific one if a valid KEY is provided
  • powerdns-http-version: http version used with DoH queries

Configuration example:

- name: console
  stdout:
    mode: text
    text-format: "timestamp-rfc3339ns identity qr qname qtype powerdns-metadata:selected_pool"

JSON format

If you logs your DNS traffic in JSON output, the following part will be added in your DNS logging messages.

  "powerdns": {
    "tags": [],
    "original-request-subnet": "",
    "applied-policy": "rpzbasic",
    "applied-policy-hit": "local-a.org",
    "applied-policy-kind": "Custom",
    "applied-policy-trigger": "local-a.org.",
    "applied-policy-type": "QNAME",
    "metadata": {
        "agent":"Go-http-client/1.1",
        "selected_pool":"pool_internet"
    },
    "http-version": "HTTP3"
  }

Dnsdist configuration

Example to enable logging in your dnsdist

rl = newRemoteLogger("<dnscollectorip>:6001")

local metadata = {  selected_pool='pool',  agent='doh-header:user-agent'  }

addAction(AllRule(),RemoteLogAction(rl, nil, {serverID="dnsdist"}, metadata))
addResponseAction(AllRule(),RemoteLogResponseAction(rl, nil, true, {serverID="dnsdist"}, metadata))
addCacheHitResponseAction(AllRule(), RemoteLogResponseAction(rl, nil, true, {serverID="dnsdist"}, metadata))

PDNS-recursor configuration

Example to enable logging in your pdns-recursor

/etc/pdns-recursor/recursor.conf

lua-config-file=/etc/pdns-recursor/recursor.lua

/etc/pdns-recursor/recursor.lua

protobufServer("<dnscollectorip>:6001", {exportTypes={pdns.A, pdns.AAAA, pdns.CNAME}})
outgoingProtobufServer("<dnscollectorip>:6001")

with RPZ

rpzFile("/etc/pdns-recursor/basic.rpz", {
  policyName="custom",
  tags={"tag"}
})