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// dnstap: flexible, structured event replication format for DNS software
//
// This file contains the protobuf schemas for the "dnstap" structured event
// replication format for DNS software.
// Written in 2013-2014 by Farsight Security, Inc.
//
// To the extent possible under law, the author(s) have dedicated all
// copyright and related and neighboring rights to this file to the public
// domain worldwide. This file is distributed without any warranty.
//
// You should have received a copy of the CC0 Public Domain Dedication along
// with this file. If not, see:
//
// <http://creativecommons.org/publicdomain/zero/1.0/>.
syntax = "proto2";
package dnstap;
// "Dnstap": this is the top-level dnstap type, which is a "union" type that
// contains other kinds of dnstap payloads, although currently only one type
// of dnstap payload is defined.
// See: https://developers.google.com/protocol-buffers/docs/techniques#union
message Dnstap {
// DNS server identity.
// If enabled, this is the identity string of the DNS server which generated
// this message. Typically this would be the same string as returned by an
// "NSID" (RFC 5001) query.
optional bytes identity = 1;
// DNS server version.
// If enabled, this is the version string of the DNS server which generated
// this message. Typically this would be the same string as returned by a
// "version.bind" query.
optional bytes version = 2;
// Extra data for this payload.
// This field can be used for adding an arbitrary byte-string annotation to
// the payload. No encoding or interpretation is applied or enforced.
optional bytes extra = 3;
// Identifies which field below is filled in.
enum Type {
MESSAGE = 1;
}
required Type type = 15;
// One of the following will be filled in.
optional Message message = 14;
}
// SocketFamily: the network protocol family of a socket. This specifies how
// to interpret "network address" fields.
enum SocketFamily {
INET = 1; // IPv4 (RFC 791)
INET6 = 2; // IPv6 (RFC 2460)
}
// SocketProtocol: the protocol used to transport a DNS message.
enum SocketProtocol {
UDP = 1; // DNS over UDP transport (RFC 1035 section 4.2.1)
TCP = 2; // DNS over TCP transport (RFC 1035 section 4.2.2)
DOT = 3; // DNS over TLS (RFC 7858)
DOH = 4; // DNS over HTTPS (RFC 8484)
DNSCryptUDP = 5; // DNSCrypt over UDP (https://dnscrypt.info/protocol)
DNSCryptTCP = 6; // DNSCrypt over TCP (https://dnscrypt.info/protocol)
DOQ = 7; // DNS over QUIC (RFC 9250)
}
// Policy: information about any name server operator policy
// applied to the processing of a DNS message.
message Policy {
// Match: what aspect of the message or message exchange
// triggered the application of the Policy.
enum Match {
QNAME = 1; // Name in question section of query
CLIENT_IP = 2; // Client IP address
RESPONSE_IP = 3; // Address in A/AAAA RRSet
NS_NAME = 4; // Authoritative name server, by name
NS_IP = 5; // Authoritative name server, by IP address
}
// The Action taken to implement the Policy.
enum Action {
NXDOMAIN = 1; // Respond with NXDOMAIN
NODATA = 2; // Respond with empty answer section
PASS = 3; // Do not alter the response (passthrough)
DROP = 4; // Do not respond.
TRUNCATE = 5; // Truncate UDP response, forcing TCP retry
LOCAL_DATA = 6; // Respond with local data from policy
}
// type: the type of policy applied, e.g. "RPZ" for a
// policy from a Response Policy Zone.
optional string type = 1;
// rule: the rule matched by the message.
//
// In a RPZ context, this is the owner name of the rule in
// the Reponse Policy Zone in wire format.
optional bytes rule = 2;
// action: the policy action taken in response to the
// rule match.
optional Action action = 3;
// match: the feature of the message exchange which matched the rule.
optional Match match = 4;
// The matched value. Format depends on the matched feature .
optional bytes value = 5;
}
// Message: a wire-format (RFC 1035 section 4) DNS message and associated
// metadata. Applications generating "Message" payloads should follow
// certain requirements based on the MessageType, see below.
message Message {
// There are eight types of "Message" defined that correspond to the
// four arrows in the following diagram, slightly modified from RFC 1035
// section 2:
// +---------+ +----------+ +--------+
// | | query | | query | |
// | Stub |-SQ--------CQ->| Recursive|-RQ----AQ->| Auth. |
// | Resolver| | Server | | Name |
// | |<-SR--------CR-| |<-RR----AR-| Server |
// +---------+ response | | response | |
// +----------+ +--------+
// Each arrow has two Type values each, one for each "end" of each arrow,
// because these are considered to be distinct events. Each end of each
// arrow on the diagram above has been marked with a two-letter Type
// mnemonic. Clockwise from upper left, these mnemonic values are:
//
// SQ: STUB_QUERY
// CQ: CLIENT_QUERY
// RQ: RESOLVER_QUERY
// AQ: AUTH_QUERY
// AR: AUTH_RESPONSE
// RR: RESOLVER_RESPONSE
// CR: CLIENT_RESPONSE
// SR: STUB_RESPONSE
// Two additional types of "Message" have been defined for the
// "forwarding" case where an upstream DNS server is responsible for
// further recursion. These are not shown on the diagram above, but have
// the following mnemonic values:
// FQ: FORWARDER_QUERY
// FR: FORWARDER_RESPONSE
// The "Message" Type values are defined below.
enum Type {
// AUTH_QUERY is a DNS query message received from a resolver by an
// authoritative name server, from the perspective of the authoritative
// name server.
AUTH_QUERY = 1;
// AUTH_RESPONSE is a DNS response message sent from an authoritative
// name server to a resolver, from the perspective of the authoritative
// name server.
AUTH_RESPONSE = 2;
// RESOLVER_QUERY is a DNS query message sent from a resolver to an
// authoritative name server, from the perspective of the resolver.
// Resolvers typically clear the RD (recursion desired) bit when
// sending queries.
RESOLVER_QUERY = 3;
// RESOLVER_RESPONSE is a DNS response message received from an
// authoritative name server by a resolver, from the perspective of
// the resolver.
RESOLVER_RESPONSE = 4;
// CLIENT_QUERY is a DNS query message sent from a client to a DNS
// server which is expected to perform further recursion, from the
// perspective of the DNS server. The client may be a stub resolver or
// forwarder or some other type of software which typically sets the RD
// (recursion desired) bit when querying the DNS server. The DNS server
// may be a simple forwarding proxy or it may be a full recursive
// resolver.
CLIENT_QUERY = 5;
// CLIENT_RESPONSE is a DNS response message sent from a DNS server to
// a client, from the perspective of the DNS server. The DNS server
// typically sets the RA (recursion available) bit when responding.
CLIENT_RESPONSE = 6;
// FORWARDER_QUERY is a DNS query message sent from a downstream DNS
// server to an upstream DNS server which is expected to perform
// further recursion, from the perspective of the downstream DNS
// server.
FORWARDER_QUERY = 7;
// FORWARDER_RESPONSE is a DNS response message sent from an upstream
// DNS server performing recursion to a downstream DNS server, from the
// perspective of the downstream DNS server.
FORWARDER_RESPONSE = 8;
// STUB_QUERY is a DNS query message sent from a stub resolver to a DNS
// server, from the perspective of the stub resolver.
STUB_QUERY = 9;
// STUB_RESPONSE is a DNS response message sent from a DNS server to a
// stub resolver, from the perspective of the stub resolver.
STUB_RESPONSE = 10;
// TOOL_QUERY is a DNS query message sent from a DNS software tool to a
// DNS server, from the perspective of the tool.
TOOL_QUERY = 11;
// TOOL_RESPONSE is a DNS response message received by a DNS software
// tool from a DNS server, from the perspective of the tool.
TOOL_RESPONSE = 12;
// UPDATE_QUERY is a Dynamic DNS Update request (RFC 2136) received
// by an authoritative name server, from the perspective of the
// authoritative name server.
UPDATE_QUERY = 13;
// UPDATE_RESPONSE is a Dynamic DNS Update response (RFC 2136) sent
// from an authoritative name server, from the perspective of the
// authoritative name server.
UPDATE_RESPONSE = 14;
}
// One of the Type values described above.
required Type type = 1;
// One of the SocketFamily values described above.
optional SocketFamily socket_family = 2;
// One of the SocketProtocol values described above.
optional SocketProtocol socket_protocol = 3;
// The network address of the message initiator.
// For SocketFamily INET, this field is 4 octets (IPv4 address).
// For SocketFamily INET6, this field is 16 octets (IPv6 address).
optional bytes query_address = 4;
// The network address of the message responder.
// For SocketFamily INET, this field is 4 octets (IPv4 address).
// For SocketFamily INET6, this field is 16 octets (IPv6 address).
optional bytes response_address = 5;
// The transport port of the message initiator.
// This is a 16-bit UDP or TCP port number, depending on SocketProtocol.
optional uint32 query_port = 6;
// The transport port of the message responder.
// This is a 16-bit UDP or TCP port number, depending on SocketProtocol.
optional uint32 response_port = 7;
// The time at which the DNS query message was sent or received, depending
// on whether this is an AUTH_QUERY, RESOLVER_QUERY, or CLIENT_QUERY.
// This is the number of seconds since the UNIX epoch.
optional uint64 query_time_sec = 8;
// The time at which the DNS query message was sent or received.
// This is the seconds fraction, expressed as a count of nanoseconds.
optional fixed32 query_time_nsec = 9;
// The initiator's original wire-format DNS query message, verbatim.
optional bytes query_message = 10;
// The "zone" or "bailiwick" pertaining to the DNS query message.
// This is a wire-format DNS domain name.
optional bytes query_zone = 11;
// The time at which the DNS response message was sent or received,
// depending on whether this is an AUTH_RESPONSE, RESOLVER_RESPONSE, or
// CLIENT_RESPONSE.
// This is the number of seconds since the UNIX epoch.
optional uint64 response_time_sec = 12;
// The time at which the DNS response message was sent or received.
// This is the seconds fraction, expressed as a count of nanoseconds.
optional fixed32 response_time_nsec = 13;
// The responder's original wire-format DNS response message, verbatim.
optional bytes response_message = 14;
// Operator policy applied to the processing of this message, if any.
optional Policy policy = 15;
}
// All fields except for 'type' in the Message schema are optional.
// It is recommended that at least the following fields be filled in for
// particular types of Messages.
// AUTH_QUERY:
// socket_family, socket_protocol
// query_address, query_port
// query_message
// query_time_sec, query_time_nsec
// AUTH_RESPONSE:
// socket_family, socket_protocol
// query_address, query_port
// query_time_sec, query_time_nsec
// response_message
// response_time_sec, response_time_nsec
// RESOLVER_QUERY:
// socket_family, socket_protocol
// query_message
// query_time_sec, query_time_nsec
// query_zone
// response_address, response_port
// RESOLVER_RESPONSE:
// socket_family, socket_protocol
// query_time_sec, query_time_nsec
// query_zone
// response_address, response_port
// response_message
// response_time_sec, response_time_nsec
// CLIENT_QUERY:
// socket_family, socket_protocol
// query_message
// query_time_sec, query_time_nsec
// CLIENT_RESPONSE:
// socket_family, socket_protocol
// query_time_sec, query_time_nsec
// response_message
// response_time_sec, response_time_nsec