Struct pcarp::block::SimplePacket

pub struct SimplePacket {
    pub packet_len: u32,
    pub packet_data: Range<usize>,
}

Contains a single captured packet, or a portion of it, with only a minimal set of information about it. If this appears in a file, an Interface Description Block is also required, before this block.

The Simple Packet Block (SPB) is a lightweight container for storing the packets coming from the network. Its presence is optional.

A Simple Packet Block is similar to an Enhanced Packet Block (see Section 4.3), but it is smaller, simpler to process and contains only a minimal set of information. This block is preferred to the standard Enhanced Packet Block when performance or space occupation are critical factors, such as in sustained traffic capture applications. A capture file can contain both Enhanced Packet Blocks and Simple Packet Blocks: for example, a capture tool could switch from Enhanced Packet Blocks to Simple Packet Blocks when the hardware resources become critical.

The Simple Packet Block does not contain the Interface ID field. Therefore, it MUST be assumed that all the Simple Packet Blocks have been captured on the interface previously specified in the first Interface Description Block.

This documentation is copyright (c) 2018 IETF Trust and the persons identified as the authors of this document. All rights reserved. Please see the linked document for the full copyright notice.

Fields

packet_len: u32

Actual length of the packet when it was transmitted on the network. It can be different from length of the Packet Data field's length if the packet has been truncated by the capture process, in which case the SnapLen value in Section 4.2 will be less than this Original Packet Length value, and the SnapLen value MUST be used to determine the size of the Packet Data field length.

packet_data: Range<usize>

The data coming from the network, including link-layer headers. The length of this field can be derived from the field Block Total Length, present in the Block Header, and it is the minimum value among the SnapLen (present in the Interface Description Block) and the Original Packet Length (present in this header). The format of the data within this Packet Data field depends on the LinkType field specified in the Interface Description Block (see Section 4.2) and it is specified in the entry for that format in the tcpdump.org link-layer header types registry.

Trait Implementations

impl<'a> From<SimplePacket> for Block<'a>

fn from(x: SimplePacket) -> Self

Performs the conversion.

impl Clone for SimplePacket

fn clone(&self) -> SimplePacket

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl PartialEq<SimplePacket> for SimplePacket

fn eq(&self, other: &SimplePacket) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &SimplePacket) -> bool

This method tests for !=.

impl Debug for SimplePacket

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.