DNS (Domain Name Service) packet: GraphViz block diagram (.dot) source

(No support for Auth-Name + Add-Name for simplicity)

KS implementation details

License: CC0-1.0

References

This page hosts a formal specification of DNS (Domain Name Service) packet using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.

GraphViz block diagram source

dns_packet.dot

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digraph {
	rankdir=LR;
	node [shape=plaintext];
	subgraph cluster__dns_packet {
		label="DnsPacket";
		graph[style=dotted];

		dns_packet__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
			<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
			<TR><TD PORT="transaction_id_pos">0</TD><TD PORT="transaction_id_size">2</TD><TD>u2be</TD><TD PORT="transaction_id_type">transaction_id</TD></TR>
			<TR><TD PORT="flags_pos">2</TD><TD PORT="flags_size">2</TD><TD>PacketFlags</TD><TD PORT="flags_type">flags</TD></TR>
			<TR><TD PORT="qdcount_pos">4</TD><TD PORT="qdcount_size">2</TD><TD>u2be</TD><TD PORT="qdcount_type">qdcount</TD></TR>
			<TR><TD PORT="ancount_pos">6</TD><TD PORT="ancount_size">2</TD><TD>u2be</TD><TD PORT="ancount_type">ancount</TD></TR>
			<TR><TD PORT="nscount_pos">8</TD><TD PORT="nscount_size">2</TD><TD>u2be</TD><TD PORT="nscount_type">nscount</TD></TR>
			<TR><TD PORT="arcount_pos">10</TD><TD PORT="arcount_size">2</TD><TD>u2be</TD><TD PORT="arcount_type">arcount</TD></TR>
			<TR><TD PORT="queries_pos">12</TD><TD PORT="queries_size">...</TD><TD>Query</TD><TD PORT="queries_type">queries</TD></TR>
			<TR><TD COLSPAN="4" PORT="queries__repeat">repeat qdcount times</TD></TR>
			<TR><TD PORT="answers_pos">...</TD><TD PORT="answers_size">...</TD><TD>Answer</TD><TD PORT="answers_type">answers</TD></TR>
			<TR><TD COLSPAN="4" PORT="answers__repeat">repeat ancount times</TD></TR>
			<TR><TD PORT="authorities_pos">...</TD><TD PORT="authorities_size">...</TD><TD>Answer</TD><TD PORT="authorities_type">authorities</TD></TR>
			<TR><TD COLSPAN="4" PORT="authorities__repeat">repeat nscount times</TD></TR>
			<TR><TD PORT="additionals_pos">...</TD><TD PORT="additionals_size">...</TD><TD>Answer</TD><TD PORT="additionals_type">additionals</TD></TR>
			<TR><TD COLSPAN="4" PORT="additionals__repeat">repeat arcount times</TD></TR>
		</TABLE>>];
		subgraph cluster__mx_info {
			label="DnsPacket::MxInfo";
			graph[style=dotted];

			mx_info__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="preference_pos">0</TD><TD PORT="preference_size">2</TD><TD>u2be</TD><TD PORT="preference_type">preference</TD></TR>
				<TR><TD PORT="mx_pos">2</TD><TD PORT="mx_size">...</TD><TD>DomainName</TD><TD PORT="mx_type">mx</TD></TR>
			</TABLE>>];
		}
		subgraph cluster__pointer_struct {
			label="DnsPacket::PointerStruct";
			graph[style=dotted];

			pointer_struct__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="value_pos">0</TD><TD PORT="value_size">1</TD><TD>u1</TD><TD PORT="value_type">value</TD></TR>
			</TABLE>>];
			pointer_struct__inst__contents [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="contents_pos">(value + ((_parent.length - 192) &lt;&lt; 8))</TD><TD PORT="contents_size">...</TD><TD>DomainName</TD><TD PORT="contents_type">contents</TD></TR>
			</TABLE>>];
		}
		subgraph cluster__label {
			label="DnsPacket::Label";
			graph[style=dotted];

			label__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="length_pos">0</TD><TD PORT="length_size">1</TD><TD>u1</TD><TD PORT="length_type">length</TD></TR>
				<TR><TD PORT="pointer_pos">1</TD><TD PORT="pointer_size">1</TD><TD>PointerStruct</TD><TD PORT="pointer_type">pointer</TD></TR>
				<TR><TD PORT="name_pos">2</TD><TD PORT="name_size">length</TD><TD>str(utf-8)</TD><TD PORT="name_type">name</TD></TR>
			</TABLE>>];
			label__inst__is_pointer [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>is_pointer</TD><TD>length &gt;= 192</TD></TR>
			</TABLE>>];
		}
		subgraph cluster__query {
			label="DnsPacket::Query";
			graph[style=dotted];

			query__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="name_pos">0</TD><TD PORT="name_size">...</TD><TD>DomainName</TD><TD PORT="name_type">name</TD></TR>
				<TR><TD PORT="type_pos">...</TD><TD PORT="type_size">2</TD><TD>u2be→TypeType</TD><TD PORT="type_type">type</TD></TR>
				<TR><TD PORT="query_class_pos">...</TD><TD PORT="query_class_size">2</TD><TD>u2be→ClassType</TD><TD PORT="query_class_type">query_class</TD></TR>
			</TABLE>>];
		}
		subgraph cluster__domain_name {
			label="DnsPacket::DomainName";
			graph[style=dotted];

			domain_name__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="name_pos">0</TD><TD PORT="name_size">...</TD><TD>Label</TD><TD PORT="name_type">name</TD></TR>
				<TR><TD COLSPAN="4" PORT="name__repeat">repeat until  ((_.length == 0) || (_.length &gt;= 192)) </TD></TR>
			</TABLE>>];
		}
		subgraph cluster__address_v6 {
			label="DnsPacket::AddressV6";
			graph[style=dotted];

			address_v6__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="ip_v6_pos">0</TD><TD PORT="ip_v6_size">16</TD><TD></TD><TD PORT="ip_v6_type">ip_v6</TD></TR>
			</TABLE>>];
		}
		subgraph cluster__service {
			label="DnsPacket::Service";
			graph[style=dotted];

			service__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="priority_pos">0</TD><TD PORT="priority_size">2</TD><TD>u2be</TD><TD PORT="priority_type">priority</TD></TR>
				<TR><TD PORT="weight_pos">2</TD><TD PORT="weight_size">2</TD><TD>u2be</TD><TD PORT="weight_type">weight</TD></TR>
				<TR><TD PORT="port_pos">4</TD><TD PORT="port_size">2</TD><TD>u2be</TD><TD PORT="port_type">port</TD></TR>
				<TR><TD PORT="target_pos">6</TD><TD PORT="target_size">...</TD><TD>DomainName</TD><TD PORT="target_type">target</TD></TR>
			</TABLE>>];
		}
		subgraph cluster__txt {
			label="DnsPacket::Txt";
			graph[style=dotted];

			txt__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="length_pos">0</TD><TD PORT="length_size">1</TD><TD>u1</TD><TD PORT="length_type">length</TD></TR>
				<TR><TD PORT="text_pos">1</TD><TD PORT="text_size">length</TD><TD>str(utf-8)</TD><TD PORT="text_type">text</TD></TR>
			</TABLE>>];
		}
		subgraph cluster__txt_body {
			label="DnsPacket::TxtBody";
			graph[style=dotted];

			txt_body__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="data_pos">0</TD><TD PORT="data_size">...</TD><TD>Txt</TD><TD PORT="data_type">data</TD></TR>
				<TR><TD COLSPAN="4" PORT="data__repeat">repeat to end of stream</TD></TR>
			</TABLE>>];
		}
		subgraph cluster__address {
			label="DnsPacket::Address";
			graph[style=dotted];

			address__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="ip_pos">0</TD><TD PORT="ip_size">4</TD><TD></TD><TD PORT="ip_type">ip</TD></TR>
			</TABLE>>];
		}
		subgraph cluster__answer {
			label="DnsPacket::Answer";
			graph[style=dotted];

			answer__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="name_pos">0</TD><TD PORT="name_size">...</TD><TD>DomainName</TD><TD PORT="name_type">name</TD></TR>
				<TR><TD PORT="type_pos">...</TD><TD PORT="type_size">2</TD><TD>u2be→TypeType</TD><TD PORT="type_type">type</TD></TR>
				<TR><TD PORT="answer_class_pos">...</TD><TD PORT="answer_class_size">2</TD><TD>u2be→ClassType</TD><TD PORT="answer_class_type">answer_class</TD></TR>
				<TR><TD PORT="ttl_pos">...</TD><TD PORT="ttl_size">4</TD><TD>s4be</TD><TD PORT="ttl_type">ttl</TD></TR>
				<TR><TD PORT="rdlength_pos">...</TD><TD PORT="rdlength_size">2</TD><TD>u2be</TD><TD PORT="rdlength_type">rdlength</TD></TR>
				<TR><TD PORT="payload_pos">...</TD><TD PORT="payload_size">...</TD><TD>switch (type)</TD><TD PORT="payload_type">payload</TD></TR>
			</TABLE>>];
answer__seq_payload_switch [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
	<TR><TD BGCOLOR="#F0F2E4">case</TD><TD BGCOLOR="#F0F2E4">type</TD></TR>
	<TR><TD>:type_type_srv</TD><TD PORT="case0">Service</TD></TR>
	<TR><TD>:type_type_a</TD><TD PORT="case1">Address</TD></TR>
	<TR><TD>:type_type_cname</TD><TD PORT="case2">DomainName</TD></TR>
	<TR><TD>:type_type_ns</TD><TD PORT="case3">DomainName</TD></TR>
	<TR><TD>:type_type_soa</TD><TD PORT="case4">AuthorityInfo</TD></TR>
	<TR><TD>:type_type_mx</TD><TD PORT="case5">MxInfo</TD></TR>
	<TR><TD>:type_type_txt</TD><TD PORT="case6">TxtBody</TD></TR>
	<TR><TD>:type_type_ptr</TD><TD PORT="case7">DomainName</TD></TR>
	<TR><TD>:type_type_aaaa</TD><TD PORT="case8">AddressV6</TD></TR>
</TABLE>>];
		}
		subgraph cluster__packet_flags {
			label="DnsPacket::PacketFlags";
			graph[style=dotted];

			packet_flags__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="flag_pos">0</TD><TD PORT="flag_size">2</TD><TD>u2be</TD><TD PORT="flag_type">flag</TD></TR>
			</TABLE>>];
			packet_flags__inst__qr [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>qr</TD><TD>((flag &amp; 32768) &gt;&gt; 15)</TD></TR>
			</TABLE>>];
			packet_flags__inst__ra [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>ra</TD><TD>((flag &amp; 128) &gt;&gt; 7)</TD></TR>
			</TABLE>>];
			packet_flags__inst__tc [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>tc</TD><TD>((flag &amp; 512) &gt;&gt; 9)</TD></TR>
			</TABLE>>];
			packet_flags__inst__is_opcode_valid [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>is_opcode_valid</TD><TD> ((opcode == 0) || (opcode == 1) || (opcode == 2)) </TD></TR>
			</TABLE>>];
			packet_flags__inst__rcode [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>rcode</TD><TD>((flag &amp; 15) &gt;&gt; 0)</TD></TR>
			</TABLE>>];
			packet_flags__inst__opcode [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>opcode</TD><TD>((flag &amp; 30720) &gt;&gt; 11)</TD></TR>
			</TABLE>>];
			packet_flags__inst__aa [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>aa</TD><TD>((flag &amp; 1024) &gt;&gt; 10)</TD></TR>
			</TABLE>>];
			packet_flags__inst__z [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>z</TD><TD>((flag &amp; 64) &gt;&gt; 6)</TD></TR>
			</TABLE>>];
			packet_flags__inst__rd [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>rd</TD><TD>((flag &amp; 256) &gt;&gt; 8)</TD></TR>
			</TABLE>>];
			packet_flags__inst__cd [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>cd</TD><TD>((flag &amp; 16) &gt;&gt; 4)</TD></TR>
			</TABLE>>];
			packet_flags__inst__ad [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">id</TD><TD BGCOLOR="#E0FFE0">value</TD></TR>
				<TR><TD>ad</TD><TD>((flag &amp; 32) &gt;&gt; 5)</TD></TR>
			</TABLE>>];
		}
		subgraph cluster__authority_info {
			label="DnsPacket::AuthorityInfo";
			graph[style=dotted];

			authority_info__seq [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
				<TR><TD BGCOLOR="#E0FFE0">pos</TD><TD BGCOLOR="#E0FFE0">size</TD><TD BGCOLOR="#E0FFE0">type</TD><TD BGCOLOR="#E0FFE0">id</TD></TR>
				<TR><TD PORT="primary_ns_pos">0</TD><TD PORT="primary_ns_size">...</TD><TD>DomainName</TD><TD PORT="primary_ns_type">primary_ns</TD></TR>
				<TR><TD PORT="resoponsible_mailbox_pos">...</TD><TD PORT="resoponsible_mailbox_size">...</TD><TD>DomainName</TD><TD PORT="resoponsible_mailbox_type">resoponsible_mailbox</TD></TR>
				<TR><TD PORT="serial_pos">...</TD><TD PORT="serial_size">4</TD><TD>u4be</TD><TD PORT="serial_type">serial</TD></TR>
				<TR><TD PORT="refresh_interval_pos">...</TD><TD PORT="refresh_interval_size">4</TD><TD>u4be</TD><TD PORT="refresh_interval_type">refresh_interval</TD></TR>
				<TR><TD PORT="retry_interval_pos">...</TD><TD PORT="retry_interval_size">4</TD><TD>u4be</TD><TD PORT="retry_interval_type">retry_interval</TD></TR>
				<TR><TD PORT="expire_limit_pos">...</TD><TD PORT="expire_limit_size">4</TD><TD>u4be</TD><TD PORT="expire_limit_type">expire_limit</TD></TR>
				<TR><TD PORT="min_ttl_pos">...</TD><TD PORT="min_ttl_size">4</TD><TD>u4be</TD><TD PORT="min_ttl_type">min_ttl</TD></TR>
			</TABLE>>];
		}
	}
	dns_packet__seq:flags_type -> packet_flags__seq [style=bold];
	dns_packet__seq:queries_type -> query__seq [style=bold];
	dns_packet__seq:qdcount_type -> dns_packet__seq:queries__repeat [color="#404040"];
	dns_packet__seq:answers_type -> answer__seq [style=bold];
	dns_packet__seq:ancount_type -> dns_packet__seq:answers__repeat [color="#404040"];
	dns_packet__seq:authorities_type -> answer__seq [style=bold];
	dns_packet__seq:nscount_type -> dns_packet__seq:authorities__repeat [color="#404040"];
	dns_packet__seq:additionals_type -> answer__seq [style=bold];
	dns_packet__seq:arcount_type -> dns_packet__seq:additionals__repeat [color="#404040"];
	mx_info__seq:mx_type -> domain_name__seq [style=bold];
	pointer_struct__seq:value_type -> pointer_struct__inst__contents:contents_pos [color="#404040"];
	label__seq:length_type -> pointer_struct__inst__contents:contents_pos [color="#404040"];
	pointer_struct__inst__contents:contents_type -> domain_name__seq [style=bold];
	label__seq:pointer_type -> pointer_struct__seq [style=bold];
	label__seq:length_type -> label__seq:name_size [color="#404040"];
	label__seq:length_type -> label__inst__is_pointer [color="#404040"];
	query__seq:name_type -> domain_name__seq [style=bold];
	domain_name__seq:name_type -> label__seq [style=bold];
	label__seq:length_type -> domain_name__seq:name__repeat [color="#404040"];
	label__seq:length_type -> domain_name__seq:name__repeat [color="#404040"];
	service__seq:target_type -> domain_name__seq [style=bold];
	txt__seq:length_type -> txt__seq:text_size [color="#404040"];
	txt_body__seq:data_type -> txt__seq [style=bold];
	answer__seq:name_type -> domain_name__seq [style=bold];
	answer__seq:payload_type -> answer__seq_payload_switch [style=bold];
	answer__seq_payload_switch:case0 -> service__seq [style=bold];
	answer__seq_payload_switch:case1 -> address__seq [style=bold];
	answer__seq_payload_switch:case2 -> domain_name__seq [style=bold];
	answer__seq_payload_switch:case3 -> domain_name__seq [style=bold];
	answer__seq_payload_switch:case4 -> authority_info__seq [style=bold];
	answer__seq_payload_switch:case5 -> mx_info__seq [style=bold];
	answer__seq_payload_switch:case6 -> txt_body__seq [style=bold];
	answer__seq_payload_switch:case7 -> domain_name__seq [style=bold];
	answer__seq_payload_switch:case8 -> address_v6__seq [style=bold];
	answer__seq:type_type -> answer__seq:payload_type [color="#404040"];
	packet_flags__seq:flag_type -> packet_flags__inst__qr [color="#404040"];
	packet_flags__seq:flag_type -> packet_flags__inst__ra [color="#404040"];
	packet_flags__seq:flag_type -> packet_flags__inst__tc [color="#404040"];
	packet_flags__inst__opcode:opcode_type -> packet_flags__inst__is_opcode_valid [color="#404040"];
	packet_flags__inst__opcode:opcode_type -> packet_flags__inst__is_opcode_valid [color="#404040"];
	packet_flags__inst__opcode:opcode_type -> packet_flags__inst__is_opcode_valid [color="#404040"];
	packet_flags__seq:flag_type -> packet_flags__inst__rcode [color="#404040"];
	packet_flags__seq:flag_type -> packet_flags__inst__opcode [color="#404040"];
	packet_flags__seq:flag_type -> packet_flags__inst__aa [color="#404040"];
	packet_flags__seq:flag_type -> packet_flags__inst__z [color="#404040"];
	packet_flags__seq:flag_type -> packet_flags__inst__rd [color="#404040"];
	packet_flags__seq:flag_type -> packet_flags__inst__cd [color="#404040"];
	packet_flags__seq:flag_type -> packet_flags__inst__ad [color="#404040"];
	authority_info__seq:primary_ns_type -> domain_name__seq [style=bold];
	authority_info__seq:resoponsible_mailbox_type -> domain_name__seq [style=bold];
}