264 lines
10 KiB
Protocol Buffer
264 lines
10 KiB
Protocol Buffer
// dnstap: flexible, structured event replication format for DNS software
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//
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// This file contains the protobuf schemas for the "dnstap" structured event
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// replication format for DNS software.
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// Written in 2013-2014 by Farsight Security, Inc.
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//
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// To the extent possible under law, the author(s) have dedicated all
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// copyright and related and neighboring rights to this file to the public
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// domain worldwide. This file is distributed without any warranty.
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//
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// You should have received a copy of the CC0 Public Domain Dedication along
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// with this file. If not, see:
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//
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// <http://creativecommons.org/publicdomain/zero/1.0/>.
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syntax = "proto2";
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package dnstap;
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// "Dnstap": this is the top-level dnstap type, which is a "union" type that
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// contains other kinds of dnstap payloads, although currently only one type
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// of dnstap payload is defined.
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// See: https://developers.google.com/protocol-buffers/docs/techniques#union
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message Dnstap {
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// DNS server identity.
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// If enabled, this is the identity string of the DNS server which generated
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// this message. Typically this would be the same string as returned by an
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// "NSID" (RFC 5001) query.
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optional bytes identity = 1;
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// DNS server version.
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// If enabled, this is the version string of the DNS server which generated
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// this message. Typically this would be the same string as returned by a
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// "version.bind" query.
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optional bytes version = 2;
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// Extra data for this payload.
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// This field can be used for adding an arbitrary byte-string annotation to
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// the payload. No encoding or interpretation is applied or enforced.
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optional bytes extra = 3;
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// Identifies which field below is filled in.
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enum Type {
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MESSAGE = 1;
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}
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required Type type = 15;
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// One of the following will be filled in.
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optional Message message = 14;
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}
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// SocketFamily: the network protocol family of a socket. This specifies how
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// to interpret "network address" fields.
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enum SocketFamily {
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INET = 1; // IPv4 (RFC 791)
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INET6 = 2; // IPv6 (RFC 2460)
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}
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// SocketProtocol: the transport protocol of a socket. This specifies how to
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// interpret "transport port" fields.
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enum SocketProtocol {
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UDP = 1; // User Datagram Protocol (RFC 768)
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TCP = 2; // Transmission Control Protocol (RFC 793)
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}
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// Message: a wire-format (RFC 1035 section 4) DNS message and associated
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// metadata. Applications generating "Message" payloads should follow
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// certain requirements based on the MessageType, see below.
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message Message {
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// There are eight types of "Message" defined that correspond to the
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// four arrows in the following diagram, slightly modified from RFC 1035
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// section 2:
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// +---------+ +----------+ +--------+
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// | | query | | query | |
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// | Stub |-SQ--------CQ->| Recursive|-RQ----AQ->| Auth. |
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// | Resolver| | Server | | Name |
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// | |<-SR--------CR-| |<-RR----AR-| Server |
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// +---------+ response | | response | |
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// +----------+ +--------+
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// Each arrow has two Type values each, one for each "end" of each arrow,
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// because these are considered to be distinct events. Each end of each
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// arrow on the diagram above has been marked with a two-letter Type
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// mnemonic. Clockwise from upper left, these mnemonic values are:
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//
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// SQ: STUB_QUERY
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// CQ: CLIENT_QUERY
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// RQ: RESOLVER_QUERY
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// AQ: AUTH_QUERY
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// AR: AUTH_RESPONSE
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// RR: RESOLVER_RESPONSE
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// CR: CLIENT_RESPONSE
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// SR: STUB_RESPONSE
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// Two additional types of "Message" have been defined for the
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// "forwarding" case where an upstream DNS server is responsible for
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// further recursion. These are not shown on the diagram above, but have
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// the following mnemonic values:
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// FQ: FORWARDER_QUERY
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// FR: FORWARDER_RESPONSE
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// The "Message" Type values are defined below.
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enum Type {
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// AUTH_QUERY is a DNS query message received from a resolver by an
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// authoritative name server, from the perspective of the authoritative
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// name server.
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AUTH_QUERY = 1;
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// AUTH_RESPONSE is a DNS response message sent from an authoritative
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// name server to a resolver, from the perspective of the authoritative
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// name server.
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AUTH_RESPONSE = 2;
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// RESOLVER_QUERY is a DNS query message sent from a resolver to an
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// authoritative name server, from the perspective of the resolver.
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// Resolvers typically clear the RD (recursion desired) bit when
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// sending queries.
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RESOLVER_QUERY = 3;
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// RESOLVER_RESPONSE is a DNS response message received from an
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// authoritative name server by a resolver, from the perspective of
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// the resolver.
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RESOLVER_RESPONSE = 4;
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// CLIENT_QUERY is a DNS query message sent from a client to a DNS
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// server which is expected to perform further recursion, from the
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// perspective of the DNS server. The client may be a stub resolver or
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// forwarder or some other type of software which typically sets the RD
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// (recursion desired) bit when querying the DNS server. The DNS server
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// may be a simple forwarding proxy or it may be a full recursive
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// resolver.
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CLIENT_QUERY = 5;
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// CLIENT_RESPONSE is a DNS response message sent from a DNS server to
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// a client, from the perspective of the DNS server. The DNS server
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// typically sets the RA (recursion available) bit when responding.
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CLIENT_RESPONSE = 6;
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// FORWARDER_QUERY is a DNS query message sent from a downstream DNS
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// server to an upstream DNS server which is expected to perform
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// further recursion, from the perspective of the downstream DNS
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// server.
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FORWARDER_QUERY = 7;
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// FORWARDER_RESPONSE is a DNS response message sent from an upstream
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// DNS server performing recursion to a downstream DNS server, from the
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// perspective of the downstream DNS server.
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FORWARDER_RESPONSE = 8;
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// STUB_QUERY is a DNS query message sent from a stub resolver to a DNS
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// server, from the perspective of the stub resolver.
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STUB_QUERY = 9;
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// STUB_RESPONSE is a DNS response message sent from a DNS server to a
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// stub resolver, from the perspective of the stub resolver.
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STUB_RESPONSE = 10;
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}
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// One of the Type values described above.
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required Type type = 1;
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// One of the SocketFamily values described above.
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optional SocketFamily socket_family = 2;
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// One of the SocketProtocol values described above.
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optional SocketProtocol socket_protocol = 3;
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// The network address of the message initiator.
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// For SocketFamily INET, this field is 4 octets (IPv4 address).
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// For SocketFamily INET6, this field is 16 octets (IPv6 address).
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optional bytes query_address = 4;
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// The network address of the message responder.
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// For SocketFamily INET, this field is 4 octets (IPv4 address).
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// For SocketFamily INET6, this field is 16 octets (IPv6 address).
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optional bytes response_address = 5;
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// The transport port of the message initiator.
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// This is a 16-bit UDP or TCP port number, depending on SocketProtocol.
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optional uint32 query_port = 6;
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// The transport port of the message responder.
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// This is a 16-bit UDP or TCP port number, depending on SocketProtocol.
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optional uint32 response_port = 7;
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// The time at which the DNS query message was sent or received, depending
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// on whether this is an AUTH_QUERY, RESOLVER_QUERY, or CLIENT_QUERY.
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// This is the number of seconds since the UNIX epoch.
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optional uint64 query_time_sec = 8;
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// The time at which the DNS query message was sent or received.
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// This is the seconds fraction, expressed as a count of nanoseconds.
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optional fixed32 query_time_nsec = 9;
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// The initiator's original wire-format DNS query message, verbatim.
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optional bytes query_message = 10;
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// The "zone" or "bailiwick" pertaining to the DNS query message.
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// This is a wire-format DNS domain name.
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optional bytes query_zone = 11;
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// The time at which the DNS response message was sent or received,
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// depending on whether this is an AUTH_RESPONSE, RESOLVER_RESPONSE, or
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// CLIENT_RESPONSE.
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// This is the number of seconds since the UNIX epoch.
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optional uint64 response_time_sec = 12;
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// The time at which the DNS response message was sent or received.
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// This is the seconds fraction, expressed as a count of nanoseconds.
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optional fixed32 response_time_nsec = 13;
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// The responder's original wire-format DNS response message, verbatim.
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optional bytes response_message = 14;
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}
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// All fields except for 'type' in the Message schema are optional.
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// It is recommended that at least the following fields be filled in for
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// particular types of Messages.
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// AUTH_QUERY:
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// socket_family, socket_protocol
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// query_address, query_port
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// query_message
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// query_time_sec, query_time_nsec
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// AUTH_RESPONSE:
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// socket_family, socket_protocol
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// query_address, query_port
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// query_time_sec, query_time_nsec
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// response_message
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// response_time_sec, response_time_nsec
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// RESOLVER_QUERY:
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// socket_family, socket_protocol
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// query_name, query_type, query_class
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// query_message
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// query_time_sec, query_time_nsec
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// query_zone
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// response_address, response_port
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// RESOLVER_RESPONSE:
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// socket_family, socket_protocol
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// query_name, query_type, query_class
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// query_time_sec, query_time_nsec
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// query_zone
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// response_address, response_port
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// response_message
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// response_time_sec, response_time_nsec
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// CLIENT_QUERY:
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// socket_family, socket_protocol
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// query_message
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// query_time_sec, query_time_nsec
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// CLIENT_RESPONSE:
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// socket_family, socket_protocol
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// query_time_sec, query_time_nsec
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// response_message
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// response_time_sec, response_time_nsec
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