.pcapdump file format: GraphViz block diagram (.dot) source

File extension

pcapdump

KS implementation details

License: CC0-1.0
Minimal Kaitai Struct required: 0.7

This page hosts a formal specification of .pcapdump file format using Kaitai Struct. This specification can be automatically translated into a variety of programming languages to get a parsing library.

GraphViz block diagram source

pcap.dot

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

		pcap__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="hdr_pos">0</TD><TD PORT="hdr_size">24</TD><TD>Header</TD><TD PORT="hdr_type">hdr</TD></TR>
			<TR><TD PORT="packets_pos">24</TD><TD PORT="packets_size">...</TD><TD>Packet</TD><TD PORT="packets_type">packets</TD></TR>
			<TR><TD COLSPAN="4" PORT="packets__repeat">repeat to end of stream</TD></TR>
		</TABLE>>];
		subgraph cluster__header {
			label="Pcap::Header";
			graph[style=dotted];

			header__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="magic_number_pos">0</TD><TD PORT="magic_number_size">4</TD><TD>D4 C3 B2 A1</TD><TD PORT="magic_number_type">magic_number</TD></TR>
				<TR><TD PORT="version_major_pos">4</TD><TD PORT="version_major_size">2</TD><TD>u2le</TD><TD PORT="version_major_type">version_major</TD></TR>
				<TR><TD PORT="version_minor_pos">6</TD><TD PORT="version_minor_size">2</TD><TD>u2le</TD><TD PORT="version_minor_type">version_minor</TD></TR>
				<TR><TD PORT="thiszone_pos">8</TD><TD PORT="thiszone_size">4</TD><TD>s4le</TD><TD PORT="thiszone_type">thiszone</TD></TR>
				<TR><TD PORT="sigfigs_pos">12</TD><TD PORT="sigfigs_size">4</TD><TD>u4le</TD><TD PORT="sigfigs_type">sigfigs</TD></TR>
				<TR><TD PORT="snaplen_pos">16</TD><TD PORT="snaplen_size">4</TD><TD>u4le</TD><TD PORT="snaplen_type">snaplen</TD></TR>
				<TR><TD PORT="network_pos">20</TD><TD PORT="network_size">4</TD><TD>u4le‚ÜíLinktype</TD><TD PORT="network_type">network</TD></TR>
			</TABLE>>];
		}
		subgraph cluster__packet {
			label="Pcap::Packet";
			graph[style=dotted];

			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="ts_sec_pos">0</TD><TD PORT="ts_sec_size">4</TD><TD>u4le</TD><TD PORT="ts_sec_type">ts_sec</TD></TR>
				<TR><TD PORT="ts_usec_pos">4</TD><TD PORT="ts_usec_size">4</TD><TD>u4le</TD><TD PORT="ts_usec_type">ts_usec</TD></TR>
				<TR><TD PORT="incl_len_pos">8</TD><TD PORT="incl_len_size">4</TD><TD>u4le</TD><TD PORT="incl_len_type">incl_len</TD></TR>
				<TR><TD PORT="orig_len_pos">12</TD><TD PORT="orig_len_size">4</TD><TD>u4le</TD><TD PORT="orig_len_type">orig_len</TD></TR>
				<TR><TD PORT="body_pos">16</TD><TD PORT="body_size">...</TD><TD>switch (_root.hdr.network)</TD><TD PORT="body_type">body</TD></TR>
			</TABLE>>];
packet__seq_body_switch [label=<<TABLE BORDER="0" CELLBORDER="1" CELLSPACING="0">
	<TR><TD BGCOLOR="#F0F2E4">case</TD><TD BGCOLOR="#F0F2E4">type</TD></TR>
	<TR><TD>:linktype_ppi</TD><TD PORT="case0">PacketPpi</TD></TR>
	<TR><TD>:linktype_ethernet</TD><TD PORT="case1">EthernetFrame</TD></TR>
</TABLE>>];
		}
	}
	pcap__seq:hdr_type -> header__seq [style=bold];
	pcap__seq:packets_type -> packet__seq [style=bold];
	packet__seq:body_type -> packet__seq_body_switch [style=bold];
	packet__seq_body_switch:case0 -> packet_ppi__seq [style=bold];
	packet__seq_body_switch:case1 -> ethernet_frame__seq [style=bold];
	header__seq:network_type -> packet__seq:body_type [color="#404040"];
}